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Linux/drivers/net/usb/hso.c

  1 /******************************************************************************
  2  *
  3  * Driver for Option High Speed Mobile Devices.
  4  *
  5  *  Copyright (C) 2008 Option International
  6  *                     Filip Aben <f.aben@option.com>
  7  *                     Denis Joseph Barrow <d.barow@option.com>
  8  *                     Jan Dumon <j.dumon@option.com>
  9  *  Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
 10  *                      <ajb@spheresystems.co.uk>
 11  *  Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
 12  *  Copyright (C) 2008 Novell, Inc.
 13  *
 14  *  This program is free software; you can redistribute it and/or modify
 15  *  it under the terms of the GNU General Public License version 2 as
 16  *  published by the Free Software Foundation.
 17  *
 18  *  This program is distributed in the hope that it will be useful,
 19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 21  *  GNU General Public License for more details.
 22  *
 23  *  You should have received a copy of the GNU General Public License
 24  *  along with this program; if not, write to the Free Software
 25  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 26  *  USA
 27  *
 28  *
 29  *****************************************************************************/
 30 
 31 /******************************************************************************
 32  *
 33  * Description of the device:
 34  *
 35  * Interface 0: Contains the IP network interface on the bulk end points.
 36  *              The multiplexed serial ports are using the interrupt and
 37  *              control endpoints.
 38  *              Interrupt contains a bitmap telling which multiplexed
 39  *              serialport needs servicing.
 40  *
 41  * Interface 1: Diagnostics port, uses bulk only, do not submit urbs until the
 42  *              port is opened, as this have a huge impact on the network port
 43  *              throughput.
 44  *
 45  * Interface 2: Standard modem interface - circuit switched interface, this
 46  *              can be used to make a standard ppp connection however it
 47  *              should not be used in conjunction with the IP network interface
 48  *              enabled for USB performance reasons i.e. if using this set
 49  *              ideally disable_net=1.
 50  *
 51  *****************************************************************************/
 52 
 53 #include <linux/sched.h>
 54 #include <linux/slab.h>
 55 #include <linux/init.h>
 56 #include <linux/delay.h>
 57 #include <linux/netdevice.h>
 58 #include <linux/module.h>
 59 #include <linux/ethtool.h>
 60 #include <linux/usb.h>
 61 #include <linux/timer.h>
 62 #include <linux/tty.h>
 63 #include <linux/tty_driver.h>
 64 #include <linux/tty_flip.h>
 65 #include <linux/kmod.h>
 66 #include <linux/rfkill.h>
 67 #include <linux/ip.h>
 68 #include <linux/uaccess.h>
 69 #include <linux/usb/cdc.h>
 70 #include <net/arp.h>
 71 #include <asm/byteorder.h>
 72 #include <linux/serial_core.h>
 73 #include <linux/serial.h>
 74 
 75 
 76 #define MOD_AUTHOR                      "Option Wireless"
 77 #define MOD_DESCRIPTION                 "USB High Speed Option driver"
 78 #define MOD_LICENSE                     "GPL"
 79 
 80 #define HSO_MAX_NET_DEVICES             10
 81 #define HSO__MAX_MTU                    2048
 82 #define DEFAULT_MTU                     1500
 83 #define DEFAULT_MRU                     1500
 84 
 85 #define CTRL_URB_RX_SIZE                1024
 86 #define CTRL_URB_TX_SIZE                64
 87 
 88 #define BULK_URB_RX_SIZE                4096
 89 #define BULK_URB_TX_SIZE                8192
 90 
 91 #define MUX_BULK_RX_BUF_SIZE            HSO__MAX_MTU
 92 #define MUX_BULK_TX_BUF_SIZE            HSO__MAX_MTU
 93 #define MUX_BULK_RX_BUF_COUNT           4
 94 #define USB_TYPE_OPTION_VENDOR          0x20
 95 
 96 /* These definitions are used with the struct hso_net flags element */
 97 /* - use *_bit operations on it. (bit indices not values.) */
 98 #define HSO_NET_RUNNING                 0
 99 
100 #define HSO_NET_TX_TIMEOUT              (HZ*10)
101 
102 #define HSO_SERIAL_MAGIC                0x48534f31
103 
104 /* Number of ttys to handle */
105 #define HSO_SERIAL_TTY_MINORS           256
106 
107 #define MAX_RX_URBS                     2
108 
109 /*****************************************************************************/
110 /* Debugging functions                                                       */
111 /*****************************************************************************/
112 #define D__(lvl_, fmt, arg...)                          \
113         do {                                            \
114                 printk(lvl_ "[%d:%s]: " fmt "\n",       \
115                        __LINE__, __func__, ## arg);     \
116         } while (0)
117 
118 #define D_(lvl, args...)                                \
119         do {                                            \
120                 if (lvl & debug)                        \
121                         D__(KERN_INFO, args);           \
122         } while (0)
123 
124 #define D1(args...)     D_(0x01, ##args)
125 #define D2(args...)     D_(0x02, ##args)
126 #define D3(args...)     D_(0x04, ##args)
127 #define D4(args...)     D_(0x08, ##args)
128 #define D5(args...)     D_(0x10, ##args)
129 
130 /*****************************************************************************/
131 /* Enumerators                                                               */
132 /*****************************************************************************/
133 enum pkt_parse_state {
134         WAIT_IP,
135         WAIT_DATA,
136         WAIT_SYNC
137 };
138 
139 /*****************************************************************************/
140 /* Structs                                                                   */
141 /*****************************************************************************/
142 
143 struct hso_shared_int {
144         struct usb_endpoint_descriptor *intr_endp;
145         void *shared_intr_buf;
146         struct urb *shared_intr_urb;
147         struct usb_device *usb;
148         int use_count;
149         int ref_count;
150         struct mutex shared_int_lock;
151 };
152 
153 struct hso_net {
154         struct hso_device *parent;
155         struct net_device *net;
156         struct rfkill *rfkill;
157 
158         struct usb_endpoint_descriptor *in_endp;
159         struct usb_endpoint_descriptor *out_endp;
160 
161         struct urb *mux_bulk_rx_urb_pool[MUX_BULK_RX_BUF_COUNT];
162         struct urb *mux_bulk_tx_urb;
163         void *mux_bulk_rx_buf_pool[MUX_BULK_RX_BUF_COUNT];
164         void *mux_bulk_tx_buf;
165 
166         struct sk_buff *skb_rx_buf;
167         struct sk_buff *skb_tx_buf;
168 
169         enum pkt_parse_state rx_parse_state;
170         spinlock_t net_lock;
171 
172         unsigned short rx_buf_size;
173         unsigned short rx_buf_missing;
174         struct iphdr rx_ip_hdr;
175 
176         unsigned long flags;
177 };
178 
179 enum rx_ctrl_state{
180         RX_IDLE,
181         RX_SENT,
182         RX_PENDING
183 };
184 
185 #define BM_REQUEST_TYPE (0xa1)
186 #define B_NOTIFICATION  (0x20)
187 #define W_VALUE         (0x0)
188 #define W_LENGTH        (0x2)
189 
190 #define B_OVERRUN       (0x1<<6)
191 #define B_PARITY        (0x1<<5)
192 #define B_FRAMING       (0x1<<4)
193 #define B_RING_SIGNAL   (0x1<<3)
194 #define B_BREAK         (0x1<<2)
195 #define B_TX_CARRIER    (0x1<<1)
196 #define B_RX_CARRIER    (0x1<<0)
197 
198 struct hso_serial_state_notification {
199         u8 bmRequestType;
200         u8 bNotification;
201         u16 wValue;
202         u16 wIndex;
203         u16 wLength;
204         u16 UART_state_bitmap;
205 } __packed;
206 
207 struct hso_tiocmget {
208         struct mutex mutex;
209         wait_queue_head_t waitq;
210         int    intr_completed;
211         struct usb_endpoint_descriptor *endp;
212         struct urb *urb;
213         struct hso_serial_state_notification serial_state_notification;
214         u16    prev_UART_state_bitmap;
215         struct uart_icount icount;
216 };
217 
218 
219 struct hso_serial {
220         struct hso_device *parent;
221         int magic;
222         u8 minor;
223 
224         struct hso_shared_int *shared_int;
225 
226         /* rx/tx urb could be either a bulk urb or a control urb depending
227            on which serial port it is used on. */
228         struct urb *rx_urb[MAX_RX_URBS];
229         u8 num_rx_urbs;
230         u8 *rx_data[MAX_RX_URBS];
231         u16 rx_data_length;     /* should contain allocated length */
232 
233         struct urb *tx_urb;
234         u8 *tx_data;
235         u8 *tx_buffer;
236         u16 tx_data_length;     /* should contain allocated length */
237         u16 tx_data_count;
238         u16 tx_buffer_count;
239         struct usb_ctrlrequest ctrl_req_tx;
240         struct usb_ctrlrequest ctrl_req_rx;
241 
242         struct usb_endpoint_descriptor *in_endp;
243         struct usb_endpoint_descriptor *out_endp;
244 
245         enum rx_ctrl_state rx_state;
246         u8 rts_state;
247         u8 dtr_state;
248         unsigned tx_urb_used:1;
249 
250         struct tty_port port;
251         /* from usb_serial_port */
252         spinlock_t serial_lock;
253 
254         int (*write_data) (struct hso_serial *serial);
255         struct hso_tiocmget  *tiocmget;
256         /* Hacks required to get flow control
257          * working on the serial receive buffers
258          * so as not to drop characters on the floor.
259          */
260         int  curr_rx_urb_idx;
261         u16  curr_rx_urb_offset;
262         u8   rx_urb_filled[MAX_RX_URBS];
263         struct tasklet_struct unthrottle_tasklet;
264         struct work_struct    retry_unthrottle_workqueue;
265 };
266 
267 struct hso_device {
268         union {
269                 struct hso_serial *dev_serial;
270                 struct hso_net *dev_net;
271         } port_data;
272 
273         u32 port_spec;
274 
275         u8 is_active;
276         u8 usb_gone;
277         struct work_struct async_get_intf;
278         struct work_struct async_put_intf;
279         struct work_struct reset_device;
280 
281         struct usb_device *usb;
282         struct usb_interface *interface;
283 
284         struct device *dev;
285         struct kref ref;
286         struct mutex mutex;
287 };
288 
289 /* Type of interface */
290 #define HSO_INTF_MASK           0xFF00
291 #define HSO_INTF_MUX            0x0100
292 #define HSO_INTF_BULK           0x0200
293 
294 /* Type of port */
295 #define HSO_PORT_MASK           0xFF
296 #define HSO_PORT_NO_PORT        0x0
297 #define HSO_PORT_CONTROL        0x1
298 #define HSO_PORT_APP            0x2
299 #define HSO_PORT_GPS            0x3
300 #define HSO_PORT_PCSC           0x4
301 #define HSO_PORT_APP2           0x5
302 #define HSO_PORT_GPS_CONTROL    0x6
303 #define HSO_PORT_MSD            0x7
304 #define HSO_PORT_VOICE          0x8
305 #define HSO_PORT_DIAG2          0x9
306 #define HSO_PORT_DIAG           0x10
307 #define HSO_PORT_MODEM          0x11
308 #define HSO_PORT_NETWORK        0x12
309 
310 /* Additional device info */
311 #define HSO_INFO_MASK           0xFF000000
312 #define HSO_INFO_CRC_BUG        0x01000000
313 
314 /*****************************************************************************/
315 /* Prototypes                                                                */
316 /*****************************************************************************/
317 /* Serial driver functions */
318 static int hso_serial_tiocmset(struct tty_struct *tty,
319                                unsigned int set, unsigned int clear);
320 static void ctrl_callback(struct urb *urb);
321 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial);
322 static void hso_kick_transmit(struct hso_serial *serial);
323 /* Helper functions */
324 static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
325                                    struct usb_device *usb, gfp_t gfp);
326 static void handle_usb_error(int status, const char *function,
327                              struct hso_device *hso_dev);
328 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
329                                                   int type, int dir);
330 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
331 static void hso_free_interface(struct usb_interface *intf);
332 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags);
333 static int hso_stop_serial_device(struct hso_device *hso_dev);
334 static int hso_start_net_device(struct hso_device *hso_dev);
335 static void hso_free_shared_int(struct hso_shared_int *shared_int);
336 static int hso_stop_net_device(struct hso_device *hso_dev);
337 static void hso_serial_ref_free(struct kref *ref);
338 static void hso_std_serial_read_bulk_callback(struct urb *urb);
339 static int hso_mux_serial_read(struct hso_serial *serial);
340 static void async_get_intf(struct work_struct *data);
341 static void async_put_intf(struct work_struct *data);
342 static int hso_put_activity(struct hso_device *hso_dev);
343 static int hso_get_activity(struct hso_device *hso_dev);
344 static void tiocmget_intr_callback(struct urb *urb);
345 static void reset_device(struct work_struct *data);
346 /*****************************************************************************/
347 /* Helping functions                                                         */
348 /*****************************************************************************/
349 
350 /* #define DEBUG */
351 
352 static inline struct hso_net *dev2net(struct hso_device *hso_dev)
353 {
354         return hso_dev->port_data.dev_net;
355 }
356 
357 static inline struct hso_serial *dev2ser(struct hso_device *hso_dev)
358 {
359         return hso_dev->port_data.dev_serial;
360 }
361 
362 /* Debugging functions */
363 #ifdef DEBUG
364 static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
365                      unsigned int len)
366 {
367         static char name[255];
368 
369         sprintf(name, "hso[%d:%s]", line_count, func_name);
370         print_hex_dump_bytes(name, DUMP_PREFIX_NONE, buf, len);
371 }
372 
373 #define DUMP(buf_, len_)        \
374         dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_)
375 
376 #define DUMP1(buf_, len_)                       \
377         do {                                    \
378                 if (0x01 & debug)               \
379                         DUMP(buf_, len_);       \
380         } while (0)
381 #else
382 #define DUMP(buf_, len_)
383 #define DUMP1(buf_, len_)
384 #endif
385 
386 /* module parameters */
387 static int debug;
388 static int tty_major;
389 static int disable_net;
390 
391 /* driver info */
392 static const char driver_name[] = "hso";
393 static const char tty_filename[] = "ttyHS";
394 static const char *version = __FILE__ ": " MOD_AUTHOR;
395 /* the usb driver itself (registered in hso_init) */
396 static struct usb_driver hso_driver;
397 /* serial structures */
398 static struct tty_driver *tty_drv;
399 static struct hso_device *serial_table[HSO_SERIAL_TTY_MINORS];
400 static struct hso_device *network_table[HSO_MAX_NET_DEVICES];
401 static spinlock_t serial_table_lock;
402 
403 static const s32 default_port_spec[] = {
404         HSO_INTF_MUX | HSO_PORT_NETWORK,
405         HSO_INTF_BULK | HSO_PORT_DIAG,
406         HSO_INTF_BULK | HSO_PORT_MODEM,
407         0
408 };
409 
410 static const s32 icon321_port_spec[] = {
411         HSO_INTF_MUX | HSO_PORT_NETWORK,
412         HSO_INTF_BULK | HSO_PORT_DIAG2,
413         HSO_INTF_BULK | HSO_PORT_MODEM,
414         HSO_INTF_BULK | HSO_PORT_DIAG,
415         0
416 };
417 
418 #define default_port_device(vendor, product)    \
419         USB_DEVICE(vendor, product),    \
420                 .driver_info = (kernel_ulong_t)default_port_spec
421 
422 #define icon321_port_device(vendor, product)    \
423         USB_DEVICE(vendor, product),    \
424                 .driver_info = (kernel_ulong_t)icon321_port_spec
425 
426 /* list of devices we support */
427 static const struct usb_device_id hso_ids[] = {
428         {default_port_device(0x0af0, 0x6711)},
429         {default_port_device(0x0af0, 0x6731)},
430         {default_port_device(0x0af0, 0x6751)},
431         {default_port_device(0x0af0, 0x6771)},
432         {default_port_device(0x0af0, 0x6791)},
433         {default_port_device(0x0af0, 0x6811)},
434         {default_port_device(0x0af0, 0x6911)},
435         {default_port_device(0x0af0, 0x6951)},
436         {default_port_device(0x0af0, 0x6971)},
437         {default_port_device(0x0af0, 0x7011)},
438         {default_port_device(0x0af0, 0x7031)},
439         {default_port_device(0x0af0, 0x7051)},
440         {default_port_device(0x0af0, 0x7071)},
441         {default_port_device(0x0af0, 0x7111)},
442         {default_port_device(0x0af0, 0x7211)},
443         {default_port_device(0x0af0, 0x7251)},
444         {default_port_device(0x0af0, 0x7271)},
445         {default_port_device(0x0af0, 0x7311)},
446         {default_port_device(0x0af0, 0xc031)},  /* Icon-Edge */
447         {icon321_port_device(0x0af0, 0xd013)},  /* Module HSxPA */
448         {icon321_port_device(0x0af0, 0xd031)},  /* Icon-321 */
449         {icon321_port_device(0x0af0, 0xd033)},  /* Icon-322 */
450         {USB_DEVICE(0x0af0, 0x7301)},           /* GE40x */
451         {USB_DEVICE(0x0af0, 0x7361)},           /* GE40x */
452         {USB_DEVICE(0x0af0, 0x7381)},           /* GE40x */
453         {USB_DEVICE(0x0af0, 0x7401)},           /* GI 0401 */
454         {USB_DEVICE(0x0af0, 0x7501)},           /* GTM 382 */
455         {USB_DEVICE(0x0af0, 0x7601)},           /* GE40x */
456         {USB_DEVICE(0x0af0, 0x7701)},
457         {USB_DEVICE(0x0af0, 0x7706)},
458         {USB_DEVICE(0x0af0, 0x7801)},
459         {USB_DEVICE(0x0af0, 0x7901)},
460         {USB_DEVICE(0x0af0, 0x7A01)},
461         {USB_DEVICE(0x0af0, 0x7A05)},
462         {USB_DEVICE(0x0af0, 0x8200)},
463         {USB_DEVICE(0x0af0, 0x8201)},
464         {USB_DEVICE(0x0af0, 0x8300)},
465         {USB_DEVICE(0x0af0, 0x8302)},
466         {USB_DEVICE(0x0af0, 0x8304)},
467         {USB_DEVICE(0x0af0, 0x8400)},
468         {USB_DEVICE(0x0af0, 0x8600)},
469         {USB_DEVICE(0x0af0, 0x8800)},
470         {USB_DEVICE(0x0af0, 0x8900)},
471         {USB_DEVICE(0x0af0, 0x9000)},
472         {USB_DEVICE(0x0af0, 0xd035)},
473         {USB_DEVICE(0x0af0, 0xd055)},
474         {USB_DEVICE(0x0af0, 0xd155)},
475         {USB_DEVICE(0x0af0, 0xd255)},
476         {USB_DEVICE(0x0af0, 0xd057)},
477         {USB_DEVICE(0x0af0, 0xd157)},
478         {USB_DEVICE(0x0af0, 0xd257)},
479         {USB_DEVICE(0x0af0, 0xd357)},
480         {USB_DEVICE(0x0af0, 0xd058)},
481         {USB_DEVICE(0x0af0, 0xc100)},
482         {}
483 };
484 MODULE_DEVICE_TABLE(usb, hso_ids);
485 
486 /* Sysfs attribute */
487 static ssize_t hso_sysfs_show_porttype(struct device *dev,
488                                        struct device_attribute *attr,
489                                        char *buf)
490 {
491         struct hso_device *hso_dev = dev_get_drvdata(dev);
492         char *port_name;
493 
494         if (!hso_dev)
495                 return 0;
496 
497         switch (hso_dev->port_spec & HSO_PORT_MASK) {
498         case HSO_PORT_CONTROL:
499                 port_name = "Control";
500                 break;
501         case HSO_PORT_APP:
502                 port_name = "Application";
503                 break;
504         case HSO_PORT_APP2:
505                 port_name = "Application2";
506                 break;
507         case HSO_PORT_GPS:
508                 port_name = "GPS";
509                 break;
510         case HSO_PORT_GPS_CONTROL:
511                 port_name = "GPS Control";
512                 break;
513         case HSO_PORT_PCSC:
514                 port_name = "PCSC";
515                 break;
516         case HSO_PORT_DIAG:
517                 port_name = "Diagnostic";
518                 break;
519         case HSO_PORT_DIAG2:
520                 port_name = "Diagnostic2";
521                 break;
522         case HSO_PORT_MODEM:
523                 port_name = "Modem";
524                 break;
525         case HSO_PORT_NETWORK:
526                 port_name = "Network";
527                 break;
528         default:
529                 port_name = "Unknown";
530                 break;
531         }
532 
533         return sprintf(buf, "%s\n", port_name);
534 }
535 static DEVICE_ATTR(hsotype, S_IRUGO, hso_sysfs_show_porttype, NULL);
536 
537 static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb)
538 {
539         int idx;
540 
541         for (idx = 0; idx < serial->num_rx_urbs; idx++)
542                 if (serial->rx_urb[idx] == urb)
543                         return idx;
544         dev_err(serial->parent->dev, "hso_urb_to_index failed\n");
545         return -1;
546 }
547 
548 /* converts mux value to a port spec value */
549 static u32 hso_mux_to_port(int mux)
550 {
551         u32 result;
552 
553         switch (mux) {
554         case 0x1:
555                 result = HSO_PORT_CONTROL;
556                 break;
557         case 0x2:
558                 result = HSO_PORT_APP;
559                 break;
560         case 0x4:
561                 result = HSO_PORT_PCSC;
562                 break;
563         case 0x8:
564                 result = HSO_PORT_GPS;
565                 break;
566         case 0x10:
567                 result = HSO_PORT_APP2;
568                 break;
569         default:
570                 result = HSO_PORT_NO_PORT;
571         }
572         return result;
573 }
574 
575 /* converts port spec value to a mux value */
576 static u32 hso_port_to_mux(int port)
577 {
578         u32 result;
579 
580         switch (port & HSO_PORT_MASK) {
581         case HSO_PORT_CONTROL:
582                 result = 0x0;
583                 break;
584         case HSO_PORT_APP:
585                 result = 0x1;
586                 break;
587         case HSO_PORT_PCSC:
588                 result = 0x2;
589                 break;
590         case HSO_PORT_GPS:
591                 result = 0x3;
592                 break;
593         case HSO_PORT_APP2:
594                 result = 0x4;
595                 break;
596         default:
597                 result = 0x0;
598         }
599         return result;
600 }
601 
602 static struct hso_serial *get_serial_by_shared_int_and_type(
603                                         struct hso_shared_int *shared_int,
604                                         int mux)
605 {
606         int i, port;
607 
608         port = hso_mux_to_port(mux);
609 
610         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
611                 if (serial_table[i] &&
612                     (dev2ser(serial_table[i])->shared_int == shared_int) &&
613                     ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) {
614                         return dev2ser(serial_table[i]);
615                 }
616         }
617 
618         return NULL;
619 }
620 
621 static struct hso_serial *get_serial_by_index(unsigned index)
622 {
623         struct hso_serial *serial = NULL;
624         unsigned long flags;
625 
626         spin_lock_irqsave(&serial_table_lock, flags);
627         if (serial_table[index])
628                 serial = dev2ser(serial_table[index]);
629         spin_unlock_irqrestore(&serial_table_lock, flags);
630 
631         return serial;
632 }
633 
634 static int get_free_serial_index(void)
635 {
636         int index;
637         unsigned long flags;
638 
639         spin_lock_irqsave(&serial_table_lock, flags);
640         for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
641                 if (serial_table[index] == NULL) {
642                         spin_unlock_irqrestore(&serial_table_lock, flags);
643                         return index;
644                 }
645         }
646         spin_unlock_irqrestore(&serial_table_lock, flags);
647 
648         printk(KERN_ERR "%s: no free serial devices in table\n", __func__);
649         return -1;
650 }
651 
652 static void set_serial_by_index(unsigned index, struct hso_serial *serial)
653 {
654         unsigned long flags;
655 
656         spin_lock_irqsave(&serial_table_lock, flags);
657         if (serial)
658                 serial_table[index] = serial->parent;
659         else
660                 serial_table[index] = NULL;
661         spin_unlock_irqrestore(&serial_table_lock, flags);
662 }
663 
664 static void handle_usb_error(int status, const char *function,
665                              struct hso_device *hso_dev)
666 {
667         char *explanation;
668 
669         switch (status) {
670         case -ENODEV:
671                 explanation = "no device";
672                 break;
673         case -ENOENT:
674                 explanation = "endpoint not enabled";
675                 break;
676         case -EPIPE:
677                 explanation = "endpoint stalled";
678                 break;
679         case -ENOSPC:
680                 explanation = "not enough bandwidth";
681                 break;
682         case -ESHUTDOWN:
683                 explanation = "device disabled";
684                 break;
685         case -EHOSTUNREACH:
686                 explanation = "device suspended";
687                 break;
688         case -EINVAL:
689         case -EAGAIN:
690         case -EFBIG:
691         case -EMSGSIZE:
692                 explanation = "internal error";
693                 break;
694         case -EILSEQ:
695         case -EPROTO:
696         case -ETIME:
697         case -ETIMEDOUT:
698                 explanation = "protocol error";
699                 if (hso_dev)
700                         schedule_work(&hso_dev->reset_device);
701                 break;
702         default:
703                 explanation = "unknown status";
704                 break;
705         }
706 
707         /* log a meaningful explanation of an USB status */
708         D1("%s: received USB status - %s (%d)", function, explanation, status);
709 }
710 
711 /* Network interface functions */
712 
713 /* called when net interface is brought up by ifconfig */
714 static int hso_net_open(struct net_device *net)
715 {
716         struct hso_net *odev = netdev_priv(net);
717         unsigned long flags = 0;
718 
719         if (!odev) {
720                 dev_err(&net->dev, "No net device !\n");
721                 return -ENODEV;
722         }
723 
724         odev->skb_tx_buf = NULL;
725 
726         /* setup environment */
727         spin_lock_irqsave(&odev->net_lock, flags);
728         odev->rx_parse_state = WAIT_IP;
729         odev->rx_buf_size = 0;
730         odev->rx_buf_missing = sizeof(struct iphdr);
731         spin_unlock_irqrestore(&odev->net_lock, flags);
732 
733         /* We are up and running. */
734         set_bit(HSO_NET_RUNNING, &odev->flags);
735         hso_start_net_device(odev->parent);
736 
737         /* Tell the kernel we are ready to start receiving from it */
738         netif_start_queue(net);
739 
740         return 0;
741 }
742 
743 /* called when interface is brought down by ifconfig */
744 static int hso_net_close(struct net_device *net)
745 {
746         struct hso_net *odev = netdev_priv(net);
747 
748         /* we don't need the queue anymore */
749         netif_stop_queue(net);
750         /* no longer running */
751         clear_bit(HSO_NET_RUNNING, &odev->flags);
752 
753         hso_stop_net_device(odev->parent);
754 
755         /* done */
756         return 0;
757 }
758 
759 /* USB tells is xmit done, we should start the netqueue again */
760 static void write_bulk_callback(struct urb *urb)
761 {
762         struct hso_net *odev = urb->context;
763         int status = urb->status;
764 
765         /* Sanity check */
766         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
767                 dev_err(&urb->dev->dev, "%s: device not running\n", __func__);
768                 return;
769         }
770 
771         /* Do we still have a valid kernel network device? */
772         if (!netif_device_present(odev->net)) {
773                 dev_err(&urb->dev->dev, "%s: net device not present\n",
774                         __func__);
775                 return;
776         }
777 
778         /* log status, but don't act on it, we don't need to resubmit anything
779          * anyhow */
780         if (status)
781                 handle_usb_error(status, __func__, odev->parent);
782 
783         hso_put_activity(odev->parent);
784 
785         /* Tell the network interface we are ready for another frame */
786         netif_wake_queue(odev->net);
787 }
788 
789 /* called by kernel when we need to transmit a packet */
790 static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb,
791                                             struct net_device *net)
792 {
793         struct hso_net *odev = netdev_priv(net);
794         int result;
795 
796         /* Tell the kernel, "No more frames 'til we are done with this one." */
797         netif_stop_queue(net);
798         if (hso_get_activity(odev->parent) == -EAGAIN) {
799                 odev->skb_tx_buf = skb;
800                 return NETDEV_TX_OK;
801         }
802 
803         /* log if asked */
804         DUMP1(skb->data, skb->len);
805         /* Copy it from kernel memory to OUR memory */
806         memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len);
807         D1("len: %d/%d", skb->len, MUX_BULK_TX_BUF_SIZE);
808 
809         /* Fill in the URB for shipping it out. */
810         usb_fill_bulk_urb(odev->mux_bulk_tx_urb,
811                           odev->parent->usb,
812                           usb_sndbulkpipe(odev->parent->usb,
813                                           odev->out_endp->
814                                           bEndpointAddress & 0x7F),
815                           odev->mux_bulk_tx_buf, skb->len, write_bulk_callback,
816                           odev);
817 
818         /* Deal with the Zero Length packet problem, I hope */
819         odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET;
820 
821         /* Send the URB on its merry way. */
822         result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC);
823         if (result) {
824                 dev_warn(&odev->parent->interface->dev,
825                         "failed mux_bulk_tx_urb %d\n", result);
826                 net->stats.tx_errors++;
827                 netif_start_queue(net);
828         } else {
829                 net->stats.tx_packets++;
830                 net->stats.tx_bytes += skb->len;
831         }
832         dev_kfree_skb(skb);
833         /* we're done */
834         return NETDEV_TX_OK;
835 }
836 
837 static const struct ethtool_ops ops = {
838         .get_link = ethtool_op_get_link
839 };
840 
841 /* called when a packet did not ack after watchdogtimeout */
842 static void hso_net_tx_timeout(struct net_device *net)
843 {
844         struct hso_net *odev = netdev_priv(net);
845 
846         if (!odev)
847                 return;
848 
849         /* Tell syslog we are hosed. */
850         dev_warn(&net->dev, "Tx timed out.\n");
851 
852         /* Tear the waiting frame off the list */
853         if (odev->mux_bulk_tx_urb &&
854             (odev->mux_bulk_tx_urb->status == -EINPROGRESS))
855                 usb_unlink_urb(odev->mux_bulk_tx_urb);
856 
857         /* Update statistics */
858         net->stats.tx_errors++;
859 }
860 
861 /* make a real packet from the received USB buffer */
862 static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
863                         unsigned int count, unsigned char is_eop)
864 {
865         unsigned short temp_bytes;
866         unsigned short buffer_offset = 0;
867         unsigned short frame_len;
868         unsigned char *tmp_rx_buf;
869 
870         /* log if needed */
871         D1("Rx %d bytes", count);
872         DUMP(ip_pkt, min(128, (int)count));
873 
874         while (count) {
875                 switch (odev->rx_parse_state) {
876                 case WAIT_IP:
877                         /* waiting for IP header. */
878                         /* wanted bytes - size of ip header */
879                         temp_bytes =
880                             (count <
881                              odev->rx_buf_missing) ? count : odev->
882                             rx_buf_missing;
883 
884                         memcpy(((unsigned char *)(&odev->rx_ip_hdr)) +
885                                odev->rx_buf_size, ip_pkt + buffer_offset,
886                                temp_bytes);
887 
888                         odev->rx_buf_size += temp_bytes;
889                         buffer_offset += temp_bytes;
890                         odev->rx_buf_missing -= temp_bytes;
891                         count -= temp_bytes;
892 
893                         if (!odev->rx_buf_missing) {
894                                 /* header is complete allocate an sk_buffer and
895                                  * continue to WAIT_DATA */
896                                 frame_len = ntohs(odev->rx_ip_hdr.tot_len);
897 
898                                 if ((frame_len > DEFAULT_MRU) ||
899                                     (frame_len < sizeof(struct iphdr))) {
900                                         dev_err(&odev->net->dev,
901                                                 "Invalid frame (%d) length\n",
902                                                 frame_len);
903                                         odev->rx_parse_state = WAIT_SYNC;
904                                         continue;
905                                 }
906                                 /* Allocate an sk_buff */
907                                 odev->skb_rx_buf = netdev_alloc_skb(odev->net,
908                                                                     frame_len);
909                                 if (!odev->skb_rx_buf) {
910                                         /* We got no receive buffer. */
911                                         D1("could not allocate memory");
912                                         odev->rx_parse_state = WAIT_SYNC;
913                                         return;
914                                 }
915 
916                                 /* Copy what we got so far. make room for iphdr
917                                  * after tail. */
918                                 tmp_rx_buf =
919                                     skb_put(odev->skb_rx_buf,
920                                             sizeof(struct iphdr));
921                                 memcpy(tmp_rx_buf, (char *)&(odev->rx_ip_hdr),
922                                        sizeof(struct iphdr));
923 
924                                 /* ETH_HLEN */
925                                 odev->rx_buf_size = sizeof(struct iphdr);
926 
927                                 /* Filip actually use .tot_len */
928                                 odev->rx_buf_missing =
929                                     frame_len - sizeof(struct iphdr);
930                                 odev->rx_parse_state = WAIT_DATA;
931                         }
932                         break;
933 
934                 case WAIT_DATA:
935                         temp_bytes = (count < odev->rx_buf_missing)
936                                         ? count : odev->rx_buf_missing;
937 
938                         /* Copy the rest of the bytes that are left in the
939                          * buffer into the waiting sk_buf. */
940                         /* Make room for temp_bytes after tail. */
941                         tmp_rx_buf = skb_put(odev->skb_rx_buf, temp_bytes);
942                         memcpy(tmp_rx_buf, ip_pkt + buffer_offset, temp_bytes);
943 
944                         odev->rx_buf_missing -= temp_bytes;
945                         count -= temp_bytes;
946                         buffer_offset += temp_bytes;
947                         odev->rx_buf_size += temp_bytes;
948                         if (!odev->rx_buf_missing) {
949                                 /* Packet is complete. Inject into stack. */
950                                 /* We have IP packet here */
951                                 odev->skb_rx_buf->protocol = cpu_to_be16(ETH_P_IP);
952                                 skb_reset_mac_header(odev->skb_rx_buf);
953 
954                                 /* Ship it off to the kernel */
955                                 netif_rx(odev->skb_rx_buf);
956                                 /* No longer our buffer. */
957                                 odev->skb_rx_buf = NULL;
958 
959                                 /* update out statistics */
960                                 odev->net->stats.rx_packets++;
961 
962                                 odev->net->stats.rx_bytes += odev->rx_buf_size;
963 
964                                 odev->rx_buf_size = 0;
965                                 odev->rx_buf_missing = sizeof(struct iphdr);
966                                 odev->rx_parse_state = WAIT_IP;
967                         }
968                         break;
969 
970                 case WAIT_SYNC:
971                         D1(" W_S");
972                         count = 0;
973                         break;
974                 default:
975                         D1(" ");
976                         count--;
977                         break;
978                 }
979         }
980 
981         /* Recovery mechanism for WAIT_SYNC state. */
982         if (is_eop) {
983                 if (odev->rx_parse_state == WAIT_SYNC) {
984                         odev->rx_parse_state = WAIT_IP;
985                         odev->rx_buf_size = 0;
986                         odev->rx_buf_missing = sizeof(struct iphdr);
987                 }
988         }
989 }
990 
991 static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
992 {
993         static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
994         u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
995 
996         if (((rest == 5) || (rest == 6)) &&
997             !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,
998                     crc_check, 4)) {
999                 urb->actual_length -= 4;
1000         }
1001 }
1002 
1003 /* Moving data from usb to kernel (in interrupt state) */
1004 static void read_bulk_callback(struct urb *urb)
1005 {
1006         struct hso_net *odev = urb->context;
1007         struct net_device *net;
1008         int result;
1009         int status = urb->status;
1010 
1011         /* is al ok?  (Filip: Who's Al ?) */
1012         if (status) {
1013                 handle_usb_error(status, __func__, odev->parent);
1014                 return;
1015         }
1016 
1017         /* Sanity check */
1018         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
1019                 D1("BULK IN callback but driver is not active!");
1020                 return;
1021         }
1022         usb_mark_last_busy(urb->dev);
1023 
1024         net = odev->net;
1025 
1026         if (!netif_device_present(net)) {
1027                 /* Somebody killed our network interface... */
1028                 return;
1029         }
1030 
1031         if (odev->parent->port_spec & HSO_INFO_CRC_BUG)
1032                 fix_crc_bug(urb, odev->in_endp->wMaxPacketSize);
1033 
1034         /* do we even have a packet? */
1035         if (urb->actual_length) {
1036                 /* Handle the IP stream, add header and push it onto network
1037                  * stack if the packet is complete. */
1038                 spin_lock(&odev->net_lock);
1039                 packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
1040                             (urb->transfer_buffer_length >
1041                              urb->actual_length) ? 1 : 0);
1042                 spin_unlock(&odev->net_lock);
1043         }
1044 
1045         /* We are done with this URB, resubmit it. Prep the USB to wait for
1046          * another frame. Reuse same as received. */
1047         usb_fill_bulk_urb(urb,
1048                           odev->parent->usb,
1049                           usb_rcvbulkpipe(odev->parent->usb,
1050                                           odev->in_endp->
1051                                           bEndpointAddress & 0x7F),
1052                           urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE,
1053                           read_bulk_callback, odev);
1054 
1055         /* Give this to the USB subsystem so it can tell us when more data
1056          * arrives. */
1057         result = usb_submit_urb(urb, GFP_ATOMIC);
1058         if (result)
1059                 dev_warn(&odev->parent->interface->dev,
1060                          "%s failed submit mux_bulk_rx_urb %d\n", __func__,
1061                          result);
1062 }
1063 
1064 /* Serial driver functions */
1065 
1066 static void hso_init_termios(struct ktermios *termios)
1067 {
1068         /*
1069          * The default requirements for this device are:
1070          */
1071         termios->c_iflag &=
1072                 ~(IGNBRK        /* disable ignore break */
1073                 | BRKINT        /* disable break causes interrupt */
1074                 | PARMRK        /* disable mark parity errors */
1075                 | ISTRIP        /* disable clear high bit of input characters */
1076                 | INLCR         /* disable translate NL to CR */
1077                 | IGNCR         /* disable ignore CR */
1078                 | ICRNL         /* disable translate CR to NL */
1079                 | IXON);        /* disable enable XON/XOFF flow control */
1080 
1081         /* disable postprocess output characters */
1082         termios->c_oflag &= ~OPOST;
1083 
1084         termios->c_lflag &=
1085                 ~(ECHO          /* disable echo input characters */
1086                 | ECHONL        /* disable echo new line */
1087                 | ICANON        /* disable erase, kill, werase, and rprnt
1088                                    special characters */
1089                 | ISIG          /* disable interrupt, quit, and suspend special
1090                                    characters */
1091                 | IEXTEN);      /* disable non-POSIX special characters */
1092 
1093         termios->c_cflag &=
1094                 ~(CSIZE         /* no size */
1095                 | PARENB        /* disable parity bit */
1096                 | CBAUD         /* clear current baud rate */
1097                 | CBAUDEX);     /* clear current buad rate */
1098 
1099         termios->c_cflag |= CS8;        /* character size 8 bits */
1100 
1101         /* baud rate 115200 */
1102         tty_termios_encode_baud_rate(termios, 115200, 115200);
1103 }
1104 
1105 static void _hso_serial_set_termios(struct tty_struct *tty,
1106                                     struct ktermios *old)
1107 {
1108         struct hso_serial *serial = tty->driver_data;
1109 
1110         if (!serial) {
1111                 printk(KERN_ERR "%s: no tty structures", __func__);
1112                 return;
1113         }
1114 
1115         D4("port %d", serial->minor);
1116 
1117         /*
1118          *      Fix up unsupported bits
1119          */
1120         tty->termios.c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */
1121 
1122         tty->termios.c_cflag &=
1123                 ~(CSIZE         /* no size */
1124                 | PARENB        /* disable parity bit */
1125                 | CBAUD         /* clear current baud rate */
1126                 | CBAUDEX);     /* clear current buad rate */
1127 
1128         tty->termios.c_cflag |= CS8;    /* character size 8 bits */
1129 
1130         /* baud rate 115200 */
1131         tty_encode_baud_rate(tty, 115200, 115200);
1132 }
1133 
1134 static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb)
1135 {
1136         int result;
1137         /* We are done with this URB, resubmit it. Prep the USB to wait for
1138          * another frame */
1139         usb_fill_bulk_urb(urb, serial->parent->usb,
1140                           usb_rcvbulkpipe(serial->parent->usb,
1141                                           serial->in_endp->
1142                                           bEndpointAddress & 0x7F),
1143                           urb->transfer_buffer, serial->rx_data_length,
1144                           hso_std_serial_read_bulk_callback, serial);
1145         /* Give this to the USB subsystem so it can tell us when more data
1146          * arrives. */
1147         result = usb_submit_urb(urb, GFP_ATOMIC);
1148         if (result) {
1149                 dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n",
1150                         __func__, result);
1151         }
1152 }
1153 
1154 
1155 
1156 
1157 static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial)
1158 {
1159         int count;
1160         struct urb *curr_urb;
1161 
1162         while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) {
1163                 curr_urb = serial->rx_urb[serial->curr_rx_urb_idx];
1164                 count = put_rxbuf_data(curr_urb, serial);
1165                 if (count == -1)
1166                         return;
1167                 if (count == 0) {
1168                         serial->curr_rx_urb_idx++;
1169                         if (serial->curr_rx_urb_idx >= serial->num_rx_urbs)
1170                                 serial->curr_rx_urb_idx = 0;
1171                         hso_resubmit_rx_bulk_urb(serial, curr_urb);
1172                 }
1173         }
1174 }
1175 
1176 static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
1177 {
1178         int count = 0;
1179         struct urb *urb;
1180 
1181         urb = serial->rx_urb[0];
1182         if (serial->port.count > 0) {
1183                 count = put_rxbuf_data(urb, serial);
1184                 if (count == -1)
1185                         return;
1186         }
1187         /* Re issue a read as long as we receive data. */
1188 
1189         if (count == 0 && ((urb->actual_length != 0) ||
1190                            (serial->rx_state == RX_PENDING))) {
1191                 serial->rx_state = RX_SENT;
1192                 hso_mux_serial_read(serial);
1193         } else
1194                 serial->rx_state = RX_IDLE;
1195 }
1196 
1197 
1198 /* read callback for Diag and CS port */
1199 static void hso_std_serial_read_bulk_callback(struct urb *urb)
1200 {
1201         struct hso_serial *serial = urb->context;
1202         int status = urb->status;
1203 
1204         D4("\n--- Got serial_read_bulk callback %02x ---", status);
1205 
1206         /* sanity check */
1207         if (!serial) {
1208                 D1("serial == NULL");
1209                 return;
1210         }
1211         if (status) {
1212                 handle_usb_error(status, __func__, serial->parent);
1213                 return;
1214         }
1215 
1216         D1("Actual length = %d\n", urb->actual_length);
1217         DUMP1(urb->transfer_buffer, urb->actual_length);
1218 
1219         /* Anyone listening? */
1220         if (serial->port.count == 0)
1221                 return;
1222 
1223         if (serial->parent->port_spec & HSO_INFO_CRC_BUG)
1224                 fix_crc_bug(urb, serial->in_endp->wMaxPacketSize);
1225         /* Valid data, handle RX data */
1226         spin_lock(&serial->serial_lock);
1227         serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;
1228         put_rxbuf_data_and_resubmit_bulk_urb(serial);
1229         spin_unlock(&serial->serial_lock);
1230 }
1231 
1232 /*
1233  * This needs to be a tasklet otherwise we will
1234  * end up recursively calling this function.
1235  */
1236 static void hso_unthrottle_tasklet(struct hso_serial *serial)
1237 {
1238         unsigned long flags;
1239 
1240         spin_lock_irqsave(&serial->serial_lock, flags);
1241         if ((serial->parent->port_spec & HSO_INTF_MUX))
1242                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1243         else
1244                 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1245         spin_unlock_irqrestore(&serial->serial_lock, flags);
1246 }
1247 
1248 static  void hso_unthrottle(struct tty_struct *tty)
1249 {
1250         struct hso_serial *serial = tty->driver_data;
1251 
1252         tasklet_hi_schedule(&serial->unthrottle_tasklet);
1253 }
1254 
1255 static void hso_unthrottle_workfunc(struct work_struct *work)
1256 {
1257         struct hso_serial *serial =
1258             container_of(work, struct hso_serial,
1259                          retry_unthrottle_workqueue);
1260         hso_unthrottle_tasklet(serial);
1261 }
1262 
1263 /* open the requested serial port */
1264 static int hso_serial_open(struct tty_struct *tty, struct file *filp)
1265 {
1266         struct hso_serial *serial = get_serial_by_index(tty->index);
1267         int result;
1268 
1269         /* sanity check */
1270         if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
1271                 WARN_ON(1);
1272                 tty->driver_data = NULL;
1273                 D1("Failed to open port");
1274                 return -ENODEV;
1275         }
1276 
1277         mutex_lock(&serial->parent->mutex);
1278         result = usb_autopm_get_interface(serial->parent->interface);
1279         if (result < 0)
1280                 goto err_out;
1281 
1282         D1("Opening %d", serial->minor);
1283         kref_get(&serial->parent->ref);
1284 
1285         /* setup */
1286         tty->driver_data = serial;
1287         tty_port_tty_set(&serial->port, tty);
1288 
1289         /* check for port already opened, if not set the termios */
1290         serial->port.count++;
1291         if (serial->port.count == 1) {
1292                 serial->rx_state = RX_IDLE;
1293                 /* Force default termio settings */
1294                 _hso_serial_set_termios(tty, NULL);
1295                 tasklet_init(&serial->unthrottle_tasklet,
1296                              (void (*)(unsigned long))hso_unthrottle_tasklet,
1297                              (unsigned long)serial);
1298                 INIT_WORK(&serial->retry_unthrottle_workqueue,
1299                           hso_unthrottle_workfunc);
1300                 result = hso_start_serial_device(serial->parent, GFP_KERNEL);
1301                 if (result) {
1302                         hso_stop_serial_device(serial->parent);
1303                         serial->port.count--;
1304                         kref_put(&serial->parent->ref, hso_serial_ref_free);
1305                 }
1306         } else {
1307                 D1("Port was already open");
1308         }
1309 
1310         usb_autopm_put_interface(serial->parent->interface);
1311 
1312         /* done */
1313         if (result)
1314                 hso_serial_tiocmset(tty, TIOCM_RTS | TIOCM_DTR, 0);
1315 err_out:
1316         mutex_unlock(&serial->parent->mutex);
1317         return result;
1318 }
1319 
1320 /* close the requested serial port */
1321 static void hso_serial_close(struct tty_struct *tty, struct file *filp)
1322 {
1323         struct hso_serial *serial = tty->driver_data;
1324         u8 usb_gone;
1325 
1326         D1("Closing serial port");
1327 
1328         /* Open failed, no close cleanup required */
1329         if (serial == NULL)
1330                 return;
1331 
1332         mutex_lock(&serial->parent->mutex);
1333         usb_gone = serial->parent->usb_gone;
1334 
1335         if (!usb_gone)
1336                 usb_autopm_get_interface(serial->parent->interface);
1337 
1338         /* reset the rts and dtr */
1339         /* do the actual close */
1340         serial->port.count--;
1341 
1342         if (serial->port.count <= 0) {
1343                 serial->port.count = 0;
1344                 tty_port_tty_set(&serial->port, NULL);
1345                 if (!usb_gone)
1346                         hso_stop_serial_device(serial->parent);
1347                 tasklet_kill(&serial->unthrottle_tasklet);
1348                 cancel_work_sync(&serial->retry_unthrottle_workqueue);
1349         }
1350 
1351         if (!usb_gone)
1352                 usb_autopm_put_interface(serial->parent->interface);
1353 
1354         mutex_unlock(&serial->parent->mutex);
1355 
1356         kref_put(&serial->parent->ref, hso_serial_ref_free);
1357 }
1358 
1359 /* close the requested serial port */
1360 static int hso_serial_write(struct tty_struct *tty, const unsigned char *buf,
1361                             int count)
1362 {
1363         struct hso_serial *serial = tty->driver_data;
1364         int space, tx_bytes;
1365         unsigned long flags;
1366 
1367         /* sanity check */
1368         if (serial == NULL) {
1369                 printk(KERN_ERR "%s: serial is NULL\n", __func__);
1370                 return -ENODEV;
1371         }
1372 
1373         spin_lock_irqsave(&serial->serial_lock, flags);
1374 
1375         space = serial->tx_data_length - serial->tx_buffer_count;
1376         tx_bytes = (count < space) ? count : space;
1377 
1378         if (!tx_bytes)
1379                 goto out;
1380 
1381         memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, tx_bytes);
1382         serial->tx_buffer_count += tx_bytes;
1383 
1384 out:
1385         spin_unlock_irqrestore(&serial->serial_lock, flags);
1386 
1387         hso_kick_transmit(serial);
1388         /* done */
1389         return tx_bytes;
1390 }
1391 
1392 /* how much room is there for writing */
1393 static int hso_serial_write_room(struct tty_struct *tty)
1394 {
1395         struct hso_serial *serial = tty->driver_data;
1396         int room;
1397         unsigned long flags;
1398 
1399         spin_lock_irqsave(&serial->serial_lock, flags);
1400         room = serial->tx_data_length - serial->tx_buffer_count;
1401         spin_unlock_irqrestore(&serial->serial_lock, flags);
1402 
1403         /* return free room */
1404         return room;
1405 }
1406 
1407 /* setup the term */
1408 static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old)
1409 {
1410         struct hso_serial *serial = tty->driver_data;
1411         unsigned long flags;
1412 
1413         if (old)
1414                 D5("Termios called with: cflags new[%d] - old[%d]",
1415                    tty->termios.c_cflag, old->c_cflag);
1416 
1417         /* the actual setup */
1418         spin_lock_irqsave(&serial->serial_lock, flags);
1419         if (serial->port.count)
1420                 _hso_serial_set_termios(tty, old);
1421         else
1422                 tty->termios = *old;
1423         spin_unlock_irqrestore(&serial->serial_lock, flags);
1424 
1425         /* done */
1426 }
1427 
1428 /* how many characters in the buffer */
1429 static int hso_serial_chars_in_buffer(struct tty_struct *tty)
1430 {
1431         struct hso_serial *serial = tty->driver_data;
1432         int chars;
1433         unsigned long flags;
1434 
1435         /* sanity check */
1436         if (serial == NULL)
1437                 return 0;
1438 
1439         spin_lock_irqsave(&serial->serial_lock, flags);
1440         chars = serial->tx_buffer_count;
1441         spin_unlock_irqrestore(&serial->serial_lock, flags);
1442 
1443         return chars;
1444 }
1445 static int tiocmget_submit_urb(struct hso_serial *serial,
1446                                struct hso_tiocmget *tiocmget,
1447                                struct usb_device *usb)
1448 {
1449         int result;
1450 
1451         if (serial->parent->usb_gone)
1452                 return -ENODEV;
1453         usb_fill_int_urb(tiocmget->urb, usb,
1454                          usb_rcvintpipe(usb,
1455                                         tiocmget->endp->
1456                                         bEndpointAddress & 0x7F),
1457                          &tiocmget->serial_state_notification,
1458                          sizeof(struct hso_serial_state_notification),
1459                          tiocmget_intr_callback, serial,
1460                          tiocmget->endp->bInterval);
1461         result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
1462         if (result) {
1463                 dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
1464                          result);
1465         }
1466         return result;
1467 
1468 }
1469 
1470 static void tiocmget_intr_callback(struct urb *urb)
1471 {
1472         struct hso_serial *serial = urb->context;
1473         struct hso_tiocmget *tiocmget;
1474         int status = urb->status;
1475         u16 UART_state_bitmap, prev_UART_state_bitmap;
1476         struct uart_icount *icount;
1477         struct hso_serial_state_notification *serial_state_notification;
1478         struct usb_device *usb;
1479         int if_num;
1480 
1481         /* Sanity checks */
1482         if (!serial)
1483                 return;
1484         if (status) {
1485                 handle_usb_error(status, __func__, serial->parent);
1486                 return;
1487         }
1488 
1489         /* tiocmget is only supported on HSO_PORT_MODEM */
1490         tiocmget = serial->tiocmget;
1491         if (!tiocmget)
1492                 return;
1493         BUG_ON((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM);
1494 
1495         usb = serial->parent->usb;
1496         if_num = serial->parent->interface->altsetting->desc.bInterfaceNumber;
1497 
1498         /* wIndex should be the USB interface number of the port to which the
1499          * notification applies, which should always be the Modem port.
1500          */
1501         serial_state_notification = &tiocmget->serial_state_notification;
1502         if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
1503             serial_state_notification->bNotification != B_NOTIFICATION ||
1504             le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
1505             le16_to_cpu(serial_state_notification->wIndex) != if_num ||
1506             le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
1507                 dev_warn(&usb->dev,
1508                          "hso received invalid serial state notification\n");
1509                 DUMP(serial_state_notification,
1510                      sizeof(struct hso_serial_state_notification));
1511         } else {
1512 
1513                 UART_state_bitmap = le16_to_cpu(serial_state_notification->
1514                                                 UART_state_bitmap);
1515                 prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
1516                 icount = &tiocmget->icount;
1517                 spin_lock(&serial->serial_lock);
1518                 if ((UART_state_bitmap & B_OVERRUN) !=
1519                    (prev_UART_state_bitmap & B_OVERRUN))
1520                         icount->parity++;
1521                 if ((UART_state_bitmap & B_PARITY) !=
1522                    (prev_UART_state_bitmap & B_PARITY))
1523                         icount->parity++;
1524                 if ((UART_state_bitmap & B_FRAMING) !=
1525                    (prev_UART_state_bitmap & B_FRAMING))
1526                         icount->frame++;
1527                 if ((UART_state_bitmap & B_RING_SIGNAL) &&
1528                    !(prev_UART_state_bitmap & B_RING_SIGNAL))
1529                         icount->rng++;
1530                 if ((UART_state_bitmap & B_BREAK) !=
1531                    (prev_UART_state_bitmap & B_BREAK))
1532                         icount->brk++;
1533                 if ((UART_state_bitmap & B_TX_CARRIER) !=
1534                    (prev_UART_state_bitmap & B_TX_CARRIER))
1535                         icount->dsr++;
1536                 if ((UART_state_bitmap & B_RX_CARRIER) !=
1537                    (prev_UART_state_bitmap & B_RX_CARRIER))
1538                         icount->dcd++;
1539                 tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
1540                 spin_unlock(&serial->serial_lock);
1541                 tiocmget->intr_completed = 1;
1542                 wake_up_interruptible(&tiocmget->waitq);
1543         }
1544         memset(serial_state_notification, 0,
1545                sizeof(struct hso_serial_state_notification));
1546         tiocmget_submit_urb(serial,
1547                             tiocmget,
1548                             serial->parent->usb);
1549 }
1550 
1551 /*
1552  * next few functions largely stolen from drivers/serial/serial_core.c
1553  */
1554 /* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1555  * - mask passed in arg for lines of interest
1556  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1557  * Caller should use TIOCGICOUNT to see which one it was
1558  */
1559 static int
1560 hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
1561 {
1562         DECLARE_WAITQUEUE(wait, current);
1563         struct uart_icount cprev, cnow;
1564         struct hso_tiocmget  *tiocmget;
1565         int ret;
1566 
1567         tiocmget = serial->tiocmget;
1568         if (!tiocmget)
1569                 return -ENOENT;
1570         /*
1571          * note the counters on entry
1572          */
1573         spin_lock_irq(&serial->serial_lock);
1574         memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
1575         spin_unlock_irq(&serial->serial_lock);
1576         add_wait_queue(&tiocmget->waitq, &wait);
1577         for (;;) {
1578                 spin_lock_irq(&serial->serial_lock);
1579                 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1580                 spin_unlock_irq(&serial->serial_lock);
1581                 set_current_state(TASK_INTERRUPTIBLE);
1582                 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1583                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1584                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd))) {
1585                         ret = 0;
1586                         break;
1587                 }
1588                 schedule();
1589                 /* see if a signal did it */
1590                 if (signal_pending(current)) {
1591                         ret = -ERESTARTSYS;
1592                         break;
1593                 }
1594                 cprev = cnow;
1595         }
1596         current->state = TASK_RUNNING;
1597         remove_wait_queue(&tiocmget->waitq, &wait);
1598 
1599         return ret;
1600 }
1601 
1602 /*
1603  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1604  * Return: write counters to the user passed counter struct
1605  * NB: both 1->0 and 0->1 transitions are counted except for
1606  *     RI where only 0->1 is counted.
1607  */
1608 static int hso_get_count(struct tty_struct *tty,
1609                   struct serial_icounter_struct *icount)
1610 {
1611         struct uart_icount cnow;
1612         struct hso_serial *serial = tty->driver_data;
1613         struct hso_tiocmget  *tiocmget = serial->tiocmget;
1614 
1615         memset(icount, 0, sizeof(struct serial_icounter_struct));
1616 
1617         if (!tiocmget)
1618                  return -ENOENT;
1619         spin_lock_irq(&serial->serial_lock);
1620         memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1621         spin_unlock_irq(&serial->serial_lock);
1622 
1623         icount->cts         = cnow.cts;
1624         icount->dsr         = cnow.dsr;
1625         icount->rng         = cnow.rng;
1626         icount->dcd         = cnow.dcd;
1627         icount->rx          = cnow.rx;
1628         icount->tx          = cnow.tx;
1629         icount->frame       = cnow.frame;
1630         icount->overrun     = cnow.overrun;
1631         icount->parity      = cnow.parity;
1632         icount->brk         = cnow.brk;
1633         icount->buf_overrun = cnow.buf_overrun;
1634 
1635         return 0;
1636 }
1637 
1638 
1639 static int hso_serial_tiocmget(struct tty_struct *tty)
1640 {
1641         int retval;
1642         struct hso_serial *serial = tty->driver_data;
1643         struct hso_tiocmget  *tiocmget;
1644         u16 UART_state_bitmap;
1645 
1646         /* sanity check */
1647         if (!serial) {
1648                 D1("no tty structures");
1649                 return -EINVAL;
1650         }
1651         spin_lock_irq(&serial->serial_lock);
1652         retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
1653             ((serial->dtr_state) ? TIOCM_DTR : 0);
1654         tiocmget = serial->tiocmget;
1655         if (tiocmget) {
1656 
1657                 UART_state_bitmap = le16_to_cpu(
1658                         tiocmget->prev_UART_state_bitmap);
1659                 if (UART_state_bitmap & B_RING_SIGNAL)
1660                         retval |=  TIOCM_RNG;
1661                 if (UART_state_bitmap & B_RX_CARRIER)
1662                         retval |=  TIOCM_CD;
1663                 if (UART_state_bitmap & B_TX_CARRIER)
1664                         retval |=  TIOCM_DSR;
1665         }
1666         spin_unlock_irq(&serial->serial_lock);
1667         return retval;
1668 }
1669 
1670 static int hso_serial_tiocmset(struct tty_struct *tty,
1671                                unsigned int set, unsigned int clear)
1672 {
1673         int val = 0;
1674         unsigned long flags;
1675         int if_num;
1676         struct hso_serial *serial = tty->driver_data;
1677 
1678         /* sanity check */
1679         if (!serial) {
1680                 D1("no tty structures");
1681                 return -EINVAL;
1682         }
1683 
1684         if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
1685                 return -EINVAL;
1686 
1687         if_num = serial->parent->interface->altsetting->desc.bInterfaceNumber;
1688 
1689         spin_lock_irqsave(&serial->serial_lock, flags);
1690         if (set & TIOCM_RTS)
1691                 serial->rts_state = 1;
1692         if (set & TIOCM_DTR)
1693                 serial->dtr_state = 1;
1694 
1695         if (clear & TIOCM_RTS)
1696                 serial->rts_state = 0;
1697         if (clear & TIOCM_DTR)
1698                 serial->dtr_state = 0;
1699 
1700         if (serial->dtr_state)
1701                 val |= 0x01;
1702         if (serial->rts_state)
1703                 val |= 0x02;
1704 
1705         spin_unlock_irqrestore(&serial->serial_lock, flags);
1706 
1707         return usb_control_msg(serial->parent->usb,
1708                                usb_rcvctrlpipe(serial->parent->usb, 0), 0x22,
1709                                0x21, val, if_num, NULL, 0,
1710                                USB_CTRL_SET_TIMEOUT);
1711 }
1712 
1713 static int hso_serial_ioctl(struct tty_struct *tty,
1714                             unsigned int cmd, unsigned long arg)
1715 {
1716         struct hso_serial *serial = tty->driver_data;
1717         int ret = 0;
1718         D4("IOCTL cmd: %d, arg: %ld", cmd, arg);
1719 
1720         if (!serial)
1721                 return -ENODEV;
1722         switch (cmd) {
1723         case TIOCMIWAIT:
1724                 ret = hso_wait_modem_status(serial, arg);
1725                 break;
1726         default:
1727                 ret = -ENOIOCTLCMD;
1728                 break;
1729         }
1730         return ret;
1731 }
1732 
1733 
1734 /* starts a transmit */
1735 static void hso_kick_transmit(struct hso_serial *serial)
1736 {
1737         u8 *temp;
1738         unsigned long flags;
1739         int res;
1740 
1741         spin_lock_irqsave(&serial->serial_lock, flags);
1742         if (!serial->tx_buffer_count)
1743                 goto out;
1744 
1745         if (serial->tx_urb_used)
1746                 goto out;
1747 
1748         /* Wakeup USB interface if necessary */
1749         if (hso_get_activity(serial->parent) == -EAGAIN)
1750                 goto out;
1751 
1752         /* Switch pointers around to avoid memcpy */
1753         temp = serial->tx_buffer;
1754         serial->tx_buffer = serial->tx_data;
1755         serial->tx_data = temp;
1756         serial->tx_data_count = serial->tx_buffer_count;
1757         serial->tx_buffer_count = 0;
1758 
1759         /* If temp is set, it means we switched buffers */
1760         if (temp && serial->write_data) {
1761                 res = serial->write_data(serial);
1762                 if (res >= 0)
1763                         serial->tx_urb_used = 1;
1764         }
1765 out:
1766         spin_unlock_irqrestore(&serial->serial_lock, flags);
1767 }
1768 
1769 /* make a request (for reading and writing data to muxed serial port) */
1770 static int mux_device_request(struct hso_serial *serial, u8 type, u16 port,
1771                               struct urb *ctrl_urb,
1772                               struct usb_ctrlrequest *ctrl_req,
1773                               u8 *ctrl_urb_data, u32 size)
1774 {
1775         int result;
1776         int pipe;
1777 
1778         /* Sanity check */
1779         if (!serial || !ctrl_urb || !ctrl_req) {
1780                 printk(KERN_ERR "%s: Wrong arguments\n", __func__);
1781                 return -EINVAL;
1782         }
1783 
1784         /* initialize */
1785         ctrl_req->wValue = 0;
1786         ctrl_req->wIndex = cpu_to_le16(hso_port_to_mux(port));
1787         ctrl_req->wLength = cpu_to_le16(size);
1788 
1789         if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) {
1790                 /* Reading command */
1791                 ctrl_req->bRequestType = USB_DIR_IN |
1792                                          USB_TYPE_OPTION_VENDOR |
1793                                          USB_RECIP_INTERFACE;
1794                 ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
1795                 pipe = usb_rcvctrlpipe(serial->parent->usb, 0);
1796         } else {
1797                 /* Writing command */
1798                 ctrl_req->bRequestType = USB_DIR_OUT |
1799                                          USB_TYPE_OPTION_VENDOR |
1800                                          USB_RECIP_INTERFACE;
1801                 ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
1802                 pipe = usb_sndctrlpipe(serial->parent->usb, 0);
1803         }
1804         /* syslog */
1805         D2("%s command (%02x) len: %d, port: %d",
1806            type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write",
1807            ctrl_req->bRequestType, ctrl_req->wLength, port);
1808 
1809         /* Load ctrl urb */
1810         ctrl_urb->transfer_flags = 0;
1811         usb_fill_control_urb(ctrl_urb,
1812                              serial->parent->usb,
1813                              pipe,
1814                              (u8 *) ctrl_req,
1815                              ctrl_urb_data, size, ctrl_callback, serial);
1816         /* Send it on merry way */
1817         result = usb_submit_urb(ctrl_urb, GFP_ATOMIC);
1818         if (result) {
1819                 dev_err(&ctrl_urb->dev->dev,
1820                         "%s failed submit ctrl_urb %d type %d\n", __func__,
1821                         result, type);
1822                 return result;
1823         }
1824 
1825         /* done */
1826         return size;
1827 }
1828 
1829 /* called by intr_callback when read occurs */
1830 static int hso_mux_serial_read(struct hso_serial *serial)
1831 {
1832         if (!serial)
1833                 return -EINVAL;
1834 
1835         /* clean data */
1836         memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE);
1837         /* make the request */
1838 
1839         if (serial->num_rx_urbs != 1) {
1840                 dev_err(&serial->parent->interface->dev,
1841                         "ERROR: mux'd reads with multiple buffers "
1842                         "not possible\n");
1843                 return 0;
1844         }
1845         return mux_device_request(serial,
1846                                   USB_CDC_GET_ENCAPSULATED_RESPONSE,
1847                                   serial->parent->port_spec & HSO_PORT_MASK,
1848                                   serial->rx_urb[0],
1849                                   &serial->ctrl_req_rx,
1850                                   serial->rx_data[0], serial->rx_data_length);
1851 }
1852 
1853 /* used for muxed serial port callback (muxed serial read) */
1854 static void intr_callback(struct urb *urb)
1855 {
1856         struct hso_shared_int *shared_int = urb->context;
1857         struct hso_serial *serial;
1858         unsigned char *port_req;
1859         int status = urb->status;
1860         int i;
1861 
1862         usb_mark_last_busy(urb->dev);
1863 
1864         /* sanity check */
1865         if (!shared_int)
1866                 return;
1867 
1868         /* status check */
1869         if (status) {
1870                 handle_usb_error(status, __func__, NULL);
1871                 return;
1872         }
1873         D4("\n--- Got intr callback 0x%02X ---", status);
1874 
1875         /* what request? */
1876         port_req = urb->transfer_buffer;
1877         D4(" port_req = 0x%.2X\n", *port_req);
1878         /* loop over all muxed ports to find the one sending this */
1879         for (i = 0; i < 8; i++) {
1880                 /* max 8 channels on MUX */
1881                 if (*port_req & (1 << i)) {
1882                         serial = get_serial_by_shared_int_and_type(shared_int,
1883                                                                    (1 << i));
1884                         if (serial != NULL) {
1885                                 D1("Pending read interrupt on port %d\n", i);
1886                                 spin_lock(&serial->serial_lock);
1887                                 if (serial->rx_state == RX_IDLE &&
1888                                         serial->port.count > 0) {
1889                                         /* Setup and send a ctrl req read on
1890                                          * port i */
1891                                         if (!serial->rx_urb_filled[0]) {
1892                                                 serial->rx_state = RX_SENT;
1893                                                 hso_mux_serial_read(serial);
1894                                         } else
1895                                                 serial->rx_state = RX_PENDING;
1896                                 } else {
1897                                         D1("Already a read pending on "
1898                                            "port %d or port not open\n", i);
1899                                 }
1900                                 spin_unlock(&serial->serial_lock);
1901                         }
1902                 }
1903         }
1904         /* Resubmit interrupt urb */
1905         hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC);
1906 }
1907 
1908 /* called for writing to muxed serial port */
1909 static int hso_mux_serial_write_data(struct hso_serial *serial)
1910 {
1911         if (NULL == serial)
1912                 return -EINVAL;
1913 
1914         return mux_device_request(serial,
1915                                   USB_CDC_SEND_ENCAPSULATED_COMMAND,
1916                                   serial->parent->port_spec & HSO_PORT_MASK,
1917                                   serial->tx_urb,
1918                                   &serial->ctrl_req_tx,
1919                                   serial->tx_data, serial->tx_data_count);
1920 }
1921 
1922 /* write callback for Diag and CS port */
1923 static void hso_std_serial_write_bulk_callback(struct urb *urb)
1924 {
1925         struct hso_serial *serial = urb->context;
1926         int status = urb->status;
1927 
1928         /* sanity check */
1929         if (!serial) {
1930                 D1("serial == NULL");
1931                 return;
1932         }
1933 
1934         spin_lock(&serial->serial_lock);
1935         serial->tx_urb_used = 0;
1936         spin_unlock(&serial->serial_lock);
1937         if (status) {
1938                 handle_usb_error(status, __func__, serial->parent);
1939                 return;
1940         }
1941         hso_put_activity(serial->parent);
1942         tty_port_tty_wakeup(&serial->port);
1943         hso_kick_transmit(serial);
1944 
1945         D1(" ");
1946 }
1947 
1948 /* called for writing diag or CS serial port */
1949 static int hso_std_serial_write_data(struct hso_serial *serial)
1950 {
1951         int count = serial->tx_data_count;
1952         int result;
1953 
1954         usb_fill_bulk_urb(serial->tx_urb,
1955                           serial->parent->usb,
1956                           usb_sndbulkpipe(serial->parent->usb,
1957                                           serial->out_endp->
1958                                           bEndpointAddress & 0x7F),
1959                           serial->tx_data, serial->tx_data_count,
1960                           hso_std_serial_write_bulk_callback, serial);
1961 
1962         result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC);
1963         if (result) {
1964                 dev_warn(&serial->parent->usb->dev,
1965                          "Failed to submit urb - res %d\n", result);
1966                 return result;
1967         }
1968 
1969         return count;
1970 }
1971 
1972 /* callback after read or write on muxed serial port */
1973 static void ctrl_callback(struct urb *urb)
1974 {
1975         struct hso_serial *serial = urb->context;
1976         struct usb_ctrlrequest *req;
1977         int status = urb->status;
1978 
1979         /* sanity check */
1980         if (!serial)
1981                 return;
1982 
1983         spin_lock(&serial->serial_lock);
1984         serial->tx_urb_used = 0;
1985         spin_unlock(&serial->serial_lock);
1986         if (status) {
1987                 handle_usb_error(status, __func__, serial->parent);
1988                 return;
1989         }
1990 
1991         /* what request? */
1992         req = (struct usb_ctrlrequest *)(urb->setup_packet);
1993         D4("\n--- Got muxed ctrl callback 0x%02X ---", status);
1994         D4("Actual length of urb = %d\n", urb->actual_length);
1995         DUMP1(urb->transfer_buffer, urb->actual_length);
1996 
1997         if (req->bRequestType ==
1998             (USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) {
1999                 /* response to a read command */
2000                 serial->rx_urb_filled[0] = 1;
2001                 spin_lock(&serial->serial_lock);
2002                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
2003                 spin_unlock(&serial->serial_lock);
2004         } else {
2005                 hso_put_activity(serial->parent);
2006                 tty_port_tty_wakeup(&serial->port);
2007                 /* response to a write command */
2008                 hso_kick_transmit(serial);
2009         }
2010 }
2011 
2012 /* handle RX data for serial port */
2013 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
2014 {
2015         struct tty_struct *tty;
2016         int write_length_remaining = 0;
2017         int curr_write_len;
2018 
2019         /* Sanity check */
2020         if (urb == NULL || serial == NULL) {
2021                 D1("serial = NULL");
2022                 return -2;
2023         }
2024 
2025         tty = tty_port_tty_get(&serial->port);
2026 
2027         /* Push data to tty */
2028         write_length_remaining = urb->actual_length -
2029                 serial->curr_rx_urb_offset;
2030         D1("data to push to tty");
2031         while (write_length_remaining) {
2032                 if (tty && test_bit(TTY_THROTTLED, &tty->flags)) {
2033                         tty_kref_put(tty);
2034                         return -1;
2035                 }
2036                 curr_write_len = tty_insert_flip_string(&serial->port,
2037                         urb->transfer_buffer + serial->curr_rx_urb_offset,
2038                         write_length_remaining);
2039                 serial->curr_rx_urb_offset += curr_write_len;
2040                 write_length_remaining -= curr_write_len;
2041                 tty_flip_buffer_push(&serial->port);
2042         }
2043         tty_kref_put(tty);
2044 
2045         if (write_length_remaining == 0) {
2046                 serial->curr_rx_urb_offset = 0;
2047                 serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
2048         }
2049         return write_length_remaining;
2050 }
2051 
2052 
2053 /* Base driver functions */
2054 
2055 static void hso_log_port(struct hso_device *hso_dev)
2056 {
2057         char *port_type;
2058         char port_dev[20];
2059 
2060         switch (hso_dev->port_spec & HSO_PORT_MASK) {
2061         case HSO_PORT_CONTROL:
2062                 port_type = "Control";
2063                 break;
2064         case HSO_PORT_APP:
2065                 port_type = "Application";
2066                 break;
2067         case HSO_PORT_GPS:
2068                 port_type = "GPS";
2069                 break;
2070         case HSO_PORT_GPS_CONTROL:
2071                 port_type = "GPS control";
2072                 break;
2073         case HSO_PORT_APP2:
2074                 port_type = "Application2";
2075                 break;
2076         case HSO_PORT_PCSC:
2077                 port_type = "PCSC";
2078                 break;
2079         case HSO_PORT_DIAG:
2080                 port_type = "Diagnostic";
2081                 break;
2082         case HSO_PORT_DIAG2:
2083                 port_type = "Diagnostic2";
2084                 break;
2085         case HSO_PORT_MODEM:
2086                 port_type = "Modem";
2087                 break;
2088         case HSO_PORT_NETWORK:
2089                 port_type = "Network";
2090                 break;
2091         default:
2092                 port_type = "Unknown";
2093                 break;
2094         }
2095         if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2096                 sprintf(port_dev, "%s", dev2net(hso_dev)->net->name);
2097         } else
2098                 sprintf(port_dev, "/dev/%s%d", tty_filename,
2099                         dev2ser(hso_dev)->minor);
2100 
2101         dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n",
2102                 port_type, port_dev);
2103 }
2104 
2105 static int hso_start_net_device(struct hso_device *hso_dev)
2106 {
2107         int i, result = 0;
2108         struct hso_net *hso_net = dev2net(hso_dev);
2109 
2110         if (!hso_net)
2111                 return -ENODEV;
2112 
2113         /* send URBs for all read buffers */
2114         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2115 
2116                 /* Prep a receive URB */
2117                 usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i],
2118                                   hso_dev->usb,
2119                                   usb_rcvbulkpipe(hso_dev->usb,
2120                                                   hso_net->in_endp->
2121                                                   bEndpointAddress & 0x7F),
2122                                   hso_net->mux_bulk_rx_buf_pool[i],
2123                                   MUX_BULK_RX_BUF_SIZE, read_bulk_callback,
2124                                   hso_net);
2125 
2126                 /* Put it out there so the device can send us stuff */
2127                 result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i],
2128                                         GFP_NOIO);
2129                 if (result)
2130                         dev_warn(&hso_dev->usb->dev,
2131                                 "%s failed mux_bulk_rx_urb[%d] %d\n", __func__,
2132                                 i, result);
2133         }
2134 
2135         return result;
2136 }
2137 
2138 static int hso_stop_net_device(struct hso_device *hso_dev)
2139 {
2140         int i;
2141         struct hso_net *hso_net = dev2net(hso_dev);
2142 
2143         if (!hso_net)
2144                 return -ENODEV;
2145 
2146         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2147                 if (hso_net->mux_bulk_rx_urb_pool[i])
2148                         usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2149 
2150         }
2151         if (hso_net->mux_bulk_tx_urb)
2152                 usb_kill_urb(hso_net->mux_bulk_tx_urb);
2153 
2154         return 0;
2155 }
2156 
2157 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
2158 {
2159         int i, result = 0;
2160         struct hso_serial *serial = dev2ser(hso_dev);
2161 
2162         if (!serial)
2163                 return -ENODEV;
2164 
2165         /* If it is not the MUX port fill in and submit a bulk urb (already
2166          * allocated in hso_serial_start) */
2167         if (!(serial->parent->port_spec & HSO_INTF_MUX)) {
2168                 for (i = 0; i < serial->num_rx_urbs; i++) {
2169                         usb_fill_bulk_urb(serial->rx_urb[i],
2170                                           serial->parent->usb,
2171                                           usb_rcvbulkpipe(serial->parent->usb,
2172                                                           serial->in_endp->
2173                                                           bEndpointAddress &
2174                                                           0x7F),
2175                                           serial->rx_data[i],
2176                                           serial->rx_data_length,
2177                                           hso_std_serial_read_bulk_callback,
2178                                           serial);
2179                         result = usb_submit_urb(serial->rx_urb[i], flags);
2180                         if (result) {
2181                                 dev_warn(&serial->parent->usb->dev,
2182                                          "Failed to submit urb - res %d\n",
2183                                          result);
2184                                 break;
2185                         }
2186                 }
2187         } else {
2188                 mutex_lock(&serial->shared_int->shared_int_lock);
2189                 if (!serial->shared_int->use_count) {
2190                         result =
2191                             hso_mux_submit_intr_urb(serial->shared_int,
2192                                                     hso_dev->usb, flags);
2193                 }
2194                 serial->shared_int->use_count++;
2195                 mutex_unlock(&serial->shared_int->shared_int_lock);
2196         }
2197         if (serial->tiocmget)
2198                 tiocmget_submit_urb(serial,
2199                                     serial->tiocmget,
2200                                     serial->parent->usb);
2201         return result;
2202 }
2203 
2204 static int hso_stop_serial_device(struct hso_device *hso_dev)
2205 {
2206         int i;
2207         struct hso_serial *serial = dev2ser(hso_dev);
2208         struct hso_tiocmget  *tiocmget;
2209 
2210         if (!serial)
2211                 return -ENODEV;
2212 
2213         for (i = 0; i < serial->num_rx_urbs; i++) {
2214                 if (serial->rx_urb[i]) {
2215                                 usb_kill_urb(serial->rx_urb[i]);
2216                                 serial->rx_urb_filled[i] = 0;
2217                 }
2218         }
2219         serial->curr_rx_urb_idx = 0;
2220         serial->curr_rx_urb_offset = 0;
2221 
2222         if (serial->tx_urb)
2223                 usb_kill_urb(serial->tx_urb);
2224 
2225         if (serial->shared_int) {
2226                 mutex_lock(&serial->shared_int->shared_int_lock);
2227                 if (serial->shared_int->use_count &&
2228                     (--serial->shared_int->use_count == 0)) {
2229                         struct urb *urb;
2230 
2231                         urb = serial->shared_int->shared_intr_urb;
2232                         if (urb)
2233                                 usb_kill_urb(urb);
2234                 }
2235                 mutex_unlock(&serial->shared_int->shared_int_lock);
2236         }
2237         tiocmget = serial->tiocmget;
2238         if (tiocmget) {
2239                 wake_up_interruptible(&tiocmget->waitq);
2240                 usb_kill_urb(tiocmget->urb);
2241         }
2242 
2243         return 0;
2244 }
2245 
2246 static void hso_serial_common_free(struct hso_serial *serial)
2247 {
2248         int i;
2249 
2250         if (serial->parent->dev)
2251                 device_remove_file(serial->parent->dev, &dev_attr_hsotype);
2252 
2253         tty_unregister_device(tty_drv, serial->minor);
2254 
2255         for (i = 0; i < serial->num_rx_urbs; i++) {
2256                 /* unlink and free RX URB */
2257                 usb_free_urb(serial->rx_urb[i]);
2258                 /* free the RX buffer */
2259                 kfree(serial->rx_data[i]);
2260         }
2261 
2262         /* unlink and free TX URB */
2263         usb_free_urb(serial->tx_urb);
2264         kfree(serial->tx_data);
2265         tty_port_destroy(&serial->port);
2266 }
2267 
2268 static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
2269                                     int rx_size, int tx_size)
2270 {
2271         struct device *dev;
2272         int minor;
2273         int i;
2274 
2275         tty_port_init(&serial->port);
2276 
2277         minor = get_free_serial_index();
2278         if (minor < 0)
2279                 goto exit;
2280 
2281         /* register our minor number */
2282         serial->parent->dev = tty_port_register_device(&serial->port, tty_drv,
2283                         minor, &serial->parent->interface->dev);
2284         dev = serial->parent->dev;
2285         dev_set_drvdata(dev, serial->parent);
2286         i = device_create_file(dev, &dev_attr_hsotype);
2287 
2288         /* fill in specific data for later use */
2289         serial->minor = minor;
2290         serial->magic = HSO_SERIAL_MAGIC;
2291         spin_lock_init(&serial->serial_lock);
2292         serial->num_rx_urbs = num_urbs;
2293 
2294         /* RX, allocate urb and initialize */
2295 
2296         /* prepare our RX buffer */
2297         serial->rx_data_length = rx_size;
2298         for (i = 0; i < serial->num_rx_urbs; i++) {
2299                 serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
2300                 if (!serial->rx_urb[i]) {
2301                         dev_err(dev, "Could not allocate urb?\n");
2302                         goto exit;
2303                 }
2304                 serial->rx_urb[i]->transfer_buffer = NULL;
2305                 serial->rx_urb[i]->transfer_buffer_length = 0;
2306                 serial->rx_data[i] = kzalloc(serial->rx_data_length,
2307                                              GFP_KERNEL);
2308                 if (!serial->rx_data[i])
2309                         goto exit;
2310         }
2311 
2312         /* TX, allocate urb and initialize */
2313         serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2314         if (!serial->tx_urb) {
2315                 dev_err(dev, "Could not allocate urb?\n");
2316                 goto exit;
2317         }
2318         serial->tx_urb->transfer_buffer = NULL;
2319         serial->tx_urb->transfer_buffer_length = 0;
2320         /* prepare our TX buffer */
2321         serial->tx_data_count = 0;
2322         serial->tx_buffer_count = 0;
2323         serial->tx_data_length = tx_size;
2324         serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL);
2325         if (!serial->tx_data)
2326                 goto exit;
2327 
2328         serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL);
2329         if (!serial->tx_buffer)
2330                 goto exit;
2331 
2332         return 0;
2333 exit:
2334         hso_serial_common_free(serial);
2335         return -1;
2336 }
2337 
2338 /* Creates a general hso device */
2339 static struct hso_device *hso_create_device(struct usb_interface *intf,
2340                                             int port_spec)
2341 {
2342         struct hso_device *hso_dev;
2343 
2344         hso_dev = kzalloc(sizeof(*hso_dev), GFP_ATOMIC);
2345         if (!hso_dev)
2346                 return NULL;
2347 
2348         hso_dev->port_spec = port_spec;
2349         hso_dev->usb = interface_to_usbdev(intf);
2350         hso_dev->interface = intf;
2351         kref_init(&hso_dev->ref);
2352         mutex_init(&hso_dev->mutex);
2353 
2354         INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
2355         INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
2356         INIT_WORK(&hso_dev->reset_device, reset_device);
2357 
2358         return hso_dev;
2359 }
2360 
2361 /* Removes a network device in the network device table */
2362 static int remove_net_device(struct hso_device *hso_dev)
2363 {
2364         int i;
2365 
2366         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2367                 if (network_table[i] == hso_dev) {
2368                         network_table[i] = NULL;
2369                         break;
2370                 }
2371         }
2372         if (i == HSO_MAX_NET_DEVICES)
2373                 return -1;
2374         return 0;
2375 }
2376 
2377 /* Frees our network device */
2378 static void hso_free_net_device(struct hso_device *hso_dev)
2379 {
2380         int i;
2381         struct hso_net *hso_net = dev2net(hso_dev);
2382 
2383         if (!hso_net)
2384                 return;
2385 
2386         remove_net_device(hso_net->parent);
2387 
2388         if (hso_net->net)
2389                 unregister_netdev(hso_net->net);
2390 
2391         /* start freeing */
2392         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2393                 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2394                 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2395                 hso_net->mux_bulk_rx_buf_pool[i] = NULL;
2396         }
2397         usb_free_urb(hso_net->mux_bulk_tx_urb);
2398         kfree(hso_net->mux_bulk_tx_buf);
2399         hso_net->mux_bulk_tx_buf = NULL;
2400 
2401         if (hso_net->net)
2402                 free_netdev(hso_net->net);
2403 
2404         kfree(hso_dev);
2405 }
2406 
2407 static const struct net_device_ops hso_netdev_ops = {
2408         .ndo_open       = hso_net_open,
2409         .ndo_stop       = hso_net_close,
2410         .ndo_start_xmit = hso_net_start_xmit,
2411         .ndo_tx_timeout = hso_net_tx_timeout,
2412 };
2413 
2414 /* initialize the network interface */
2415 static void hso_net_init(struct net_device *net)
2416 {
2417         struct hso_net *hso_net = netdev_priv(net);
2418 
2419         D1("sizeof hso_net is %d", (int)sizeof(*hso_net));
2420 
2421         /* fill in the other fields */
2422         net->netdev_ops = &hso_netdev_ops;
2423         net->watchdog_timeo = HSO_NET_TX_TIMEOUT;
2424         net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2425         net->type = ARPHRD_NONE;
2426         net->mtu = DEFAULT_MTU - 14;
2427         net->tx_queue_len = 10;
2428         SET_ETHTOOL_OPS(net, &ops);
2429 
2430         /* and initialize the semaphore */
2431         spin_lock_init(&hso_net->net_lock);
2432 }
2433 
2434 /* Adds a network device in the network device table */
2435 static int add_net_device(struct hso_device *hso_dev)
2436 {
2437         int i;
2438 
2439         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2440                 if (network_table[i] == NULL) {
2441                         network_table[i] = hso_dev;
2442                         break;
2443                 }
2444         }
2445         if (i == HSO_MAX_NET_DEVICES)
2446                 return -1;
2447         return 0;
2448 }
2449 
2450 static int hso_rfkill_set_block(void *data, bool blocked)
2451 {
2452         struct hso_device *hso_dev = data;
2453         int enabled = !blocked;
2454         int rv;
2455 
2456         mutex_lock(&hso_dev->mutex);
2457         if (hso_dev->usb_gone)
2458                 rv = 0;
2459         else
2460                 rv = usb_control_msg(hso_dev->usb, usb_rcvctrlpipe(hso_dev->usb, 0),
2461                                        enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
2462                                        USB_CTRL_SET_TIMEOUT);
2463         mutex_unlock(&hso_dev->mutex);
2464         return rv;
2465 }
2466 
2467 static const struct rfkill_ops hso_rfkill_ops = {
2468         .set_block = hso_rfkill_set_block,
2469 };
2470 
2471 /* Creates and sets up everything for rfkill */
2472 static void hso_create_rfkill(struct hso_device *hso_dev,
2473                              struct usb_interface *interface)
2474 {
2475         struct hso_net *hso_net = dev2net(hso_dev);
2476         struct device *dev = &hso_net->net->dev;
2477         char *rfkn;
2478 
2479         rfkn = kzalloc(20, GFP_KERNEL);
2480         if (!rfkn)
2481                 dev_err(dev, "%s - Out of memory\n", __func__);
2482 
2483         snprintf(rfkn, 20, "hso-%d",
2484                  interface->altsetting->desc.bInterfaceNumber);
2485 
2486         hso_net->rfkill = rfkill_alloc(rfkn,
2487                                        &interface_to_usbdev(interface)->dev,
2488                                        RFKILL_TYPE_WWAN,
2489                                        &hso_rfkill_ops, hso_dev);
2490         if (!hso_net->rfkill) {
2491                 dev_err(dev, "%s - Out of memory\n", __func__);
2492                 kfree(rfkn);
2493                 return;
2494         }
2495         if (rfkill_register(hso_net->rfkill) < 0) {
2496                 rfkill_destroy(hso_net->rfkill);
2497                 kfree(rfkn);
2498                 hso_net->rfkill = NULL;
2499                 dev_err(dev, "%s - Failed to register rfkill\n", __func__);
2500                 return;
2501         }
2502 }
2503 
2504 static struct device_type hso_type = {
2505         .name   = "wwan",
2506 };
2507 
2508 /* Creates our network device */
2509 static struct hso_device *hso_create_net_device(struct usb_interface *interface,
2510                                                 int port_spec)
2511 {
2512         int result, i;
2513         struct net_device *net;
2514         struct hso_net *hso_net;
2515         struct hso_device *hso_dev;
2516 
2517         hso_dev = hso_create_device(interface, port_spec);
2518         if (!hso_dev)
2519                 return NULL;
2520 
2521         /* allocate our network device, then we can put in our private data */
2522         /* call hso_net_init to do the basic initialization */
2523         net = alloc_netdev(sizeof(struct hso_net), "hso%d", hso_net_init);
2524         if (!net) {
2525                 dev_err(&interface->dev, "Unable to create ethernet device\n");
2526                 goto exit;
2527         }
2528 
2529         hso_net = netdev_priv(net);
2530 
2531         hso_dev->port_data.dev_net = hso_net;
2532         hso_net->net = net;
2533         hso_net->parent = hso_dev;
2534 
2535         hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2536                                       USB_DIR_IN);
2537         if (!hso_net->in_endp) {
2538                 dev_err(&interface->dev, "Can't find BULK IN endpoint\n");
2539                 goto exit;
2540         }
2541         hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2542                                        USB_DIR_OUT);
2543         if (!hso_net->out_endp) {
2544                 dev_err(&interface->dev, "Can't find BULK OUT endpoint\n");
2545                 goto exit;
2546         }
2547         SET_NETDEV_DEV(net, &interface->dev);
2548         SET_NETDEV_DEVTYPE(net, &hso_type);
2549 
2550         /* registering our net device */
2551         result = register_netdev(net);
2552         if (result) {
2553                 dev_err(&interface->dev, "Failed to register device\n");
2554                 goto exit;
2555         }
2556 
2557         /* start allocating */
2558         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2559                 hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
2560                 if (!hso_net->mux_bulk_rx_urb_pool[i]) {
2561                         dev_err(&interface->dev, "Could not allocate rx urb\n");
2562                         goto exit;
2563                 }
2564                 hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE,
2565                                                            GFP_KERNEL);
2566                 if (!hso_net->mux_bulk_rx_buf_pool[i])
2567                         goto exit;
2568         }
2569         hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2570         if (!hso_net->mux_bulk_tx_urb) {
2571                 dev_err(&interface->dev, "Could not allocate tx urb\n");
2572                 goto exit;
2573         }
2574         hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL);
2575         if (!hso_net->mux_bulk_tx_buf)
2576                 goto exit;
2577 
2578         add_net_device(hso_dev);
2579 
2580         hso_log_port(hso_dev);
2581 
2582         hso_create_rfkill(hso_dev, interface);
2583 
2584         return hso_dev;
2585 exit:
2586         hso_free_net_device(hso_dev);
2587         return NULL;
2588 }
2589 
2590 static void hso_free_tiomget(struct hso_serial *serial)
2591 {
2592         struct hso_tiocmget *tiocmget;
2593         if (!serial)
2594                 return;
2595         tiocmget = serial->tiocmget;
2596         if (tiocmget) {
2597                 usb_free_urb(tiocmget->urb);
2598                 tiocmget->urb = NULL;
2599                 serial->tiocmget = NULL;
2600                 kfree(tiocmget);
2601         }
2602 }
2603 
2604 /* Frees an AT channel ( goes for both mux and non-mux ) */
2605 static void hso_free_serial_device(struct hso_device *hso_dev)
2606 {
2607         struct hso_serial *serial = dev2ser(hso_dev);
2608 
2609         if (!serial)
2610                 return;
2611         set_serial_by_index(serial->minor, NULL);
2612 
2613         hso_serial_common_free(serial);
2614 
2615         if (serial->shared_int) {
2616                 mutex_lock(&serial->shared_int->shared_int_lock);
2617                 if (--serial->shared_int->ref_count == 0)
2618                         hso_free_shared_int(serial->shared_int);
2619                 else
2620                         mutex_unlock(&serial->shared_int->shared_int_lock);
2621         }
2622         hso_free_tiomget(serial);
2623         kfree(serial);
2624         kfree(hso_dev);
2625 }
2626 
2627 /* Creates a bulk AT channel */
2628 static struct hso_device *hso_create_bulk_serial_device(
2629                         struct usb_interface *interface, int port)
2630 {
2631         struct hso_device *hso_dev;
2632         struct hso_serial *serial;
2633         int num_urbs;
2634         struct hso_tiocmget *tiocmget;
2635 
2636         hso_dev = hso_create_device(interface, port);
2637         if (!hso_dev)
2638                 return NULL;
2639 
2640         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2641         if (!serial)
2642                 goto exit;
2643 
2644         serial->parent = hso_dev;
2645         hso_dev->port_data.dev_serial = serial;
2646 
2647         if ((port & HSO_PORT_MASK) == HSO_PORT_MODEM) {
2648                 num_urbs = 2;
2649                 serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
2650                                            GFP_KERNEL);
2651                 /* it isn't going to break our heart if serial->tiocmget
2652                  *  allocation fails don't bother checking this.
2653                  */
2654                 if (serial->tiocmget) {
2655                         tiocmget = serial->tiocmget;
2656                         tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
2657                         if (tiocmget->urb) {
2658                                 mutex_init(&tiocmget->mutex);
2659                                 init_waitqueue_head(&tiocmget->waitq);
2660                                 tiocmget->endp = hso_get_ep(
2661                                         interface,
2662                                         USB_ENDPOINT_XFER_INT,
2663                                         USB_DIR_IN);
2664                         } else
2665                                 hso_free_tiomget(serial);
2666                 }
2667         }
2668         else
2669                 num_urbs = 1;
2670 
2671         if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
2672                                      BULK_URB_TX_SIZE))
2673                 goto exit;
2674 
2675         serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2676                                      USB_DIR_IN);
2677         if (!serial->in_endp) {
2678                 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2679                 goto exit2;
2680         }
2681 
2682         if (!
2683             (serial->out_endp =
2684              hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
2685                 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2686                 goto exit2;
2687         }
2688 
2689         serial->write_data = hso_std_serial_write_data;
2690 
2691         /* and record this serial */
2692         set_serial_by_index(serial->minor, serial);
2693 
2694         /* setup the proc dirs and files if needed */
2695         hso_log_port(hso_dev);
2696 
2697         /* done, return it */
2698         return hso_dev;
2699 
2700 exit2:
2701         hso_serial_common_free(serial);
2702 exit:
2703         hso_free_tiomget(serial);
2704         kfree(serial);
2705         kfree(hso_dev);
2706         return NULL;
2707 }
2708 
2709 /* Creates a multiplexed AT channel */
2710 static
2711 struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
2712                                                 int port,
2713                                                 struct hso_shared_int *mux)
2714 {
2715         struct hso_device *hso_dev;
2716         struct hso_serial *serial;
2717         int port_spec;
2718 
2719         port_spec = HSO_INTF_MUX;
2720         port_spec &= ~HSO_PORT_MASK;
2721 
2722         port_spec |= hso_mux_to_port(port);
2723         if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT)
2724                 return NULL;
2725 
2726         hso_dev = hso_create_device(interface, port_spec);
2727         if (!hso_dev)
2728                 return NULL;
2729 
2730         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2731         if (!serial)
2732                 goto exit;
2733 
2734         hso_dev->port_data.dev_serial = serial;
2735         serial->parent = hso_dev;
2736 
2737         if (hso_serial_common_create
2738             (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
2739                 goto exit;
2740 
2741         serial->tx_data_length--;
2742         serial->write_data = hso_mux_serial_write_data;
2743 
2744         serial->shared_int = mux;
2745         mutex_lock(&serial->shared_int->shared_int_lock);
2746         serial->shared_int->ref_count++;
2747         mutex_unlock(&serial->shared_int->shared_int_lock);
2748 
2749         /* and record this serial */
2750         set_serial_by_index(serial->minor, serial);
2751 
2752         /* setup the proc dirs and files if needed */
2753         hso_log_port(hso_dev);
2754 
2755         /* done, return it */
2756         return hso_dev;
2757 
2758 exit:
2759         if (serial) {
2760                 tty_unregister_device(tty_drv, serial->minor);
2761                 kfree(serial);
2762         }
2763         if (hso_dev)
2764                 kfree(hso_dev);
2765         return NULL;
2766 
2767 }
2768 
2769 static void hso_free_shared_int(struct hso_shared_int *mux)
2770 {
2771         usb_free_urb(mux->shared_intr_urb);
2772         kfree(mux->shared_intr_buf);
2773         mutex_unlock(&mux->shared_int_lock);
2774         kfree(mux);
2775 }
2776 
2777 static
2778 struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface)
2779 {
2780         struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL);
2781 
2782         if (!mux)
2783                 return NULL;
2784 
2785         mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT,
2786                                     USB_DIR_IN);
2787         if (!mux->intr_endp) {
2788                 dev_err(&interface->dev, "Can't find INT IN endpoint\n");
2789                 goto exit;
2790         }
2791 
2792         mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL);
2793         if (!mux->shared_intr_urb) {
2794                 dev_err(&interface->dev, "Could not allocate intr urb?\n");
2795                 goto exit;
2796         }
2797         mux->shared_intr_buf =
2798                 kzalloc(le16_to_cpu(mux->intr_endp->wMaxPacketSize),
2799                         GFP_KERNEL);
2800         if (!mux->shared_intr_buf)
2801                 goto exit;
2802 
2803         mutex_init(&mux->shared_int_lock);
2804 
2805         return mux;
2806 
2807 exit:
2808         kfree(mux->shared_intr_buf);
2809         usb_free_urb(mux->shared_intr_urb);
2810         kfree(mux);
2811         return NULL;
2812 }
2813 
2814 /* Gets the port spec for a certain interface */
2815 static int hso_get_config_data(struct usb_interface *interface)
2816 {
2817         struct usb_device *usbdev = interface_to_usbdev(interface);
2818         u8 *config_data = kmalloc(17, GFP_KERNEL);
2819         u32 if_num = interface->altsetting->desc.bInterfaceNumber;
2820         s32 result;
2821 
2822         if (!config_data)
2823                 return -ENOMEM;
2824         if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
2825                             0x86, 0xC0, 0, 0, config_data, 17,
2826                             USB_CTRL_SET_TIMEOUT) != 0x11) {
2827                 kfree(config_data);
2828                 return -EIO;
2829         }
2830 
2831         switch (config_data[if_num]) {
2832         case 0x0:
2833                 result = 0;
2834                 break;
2835         case 0x1:
2836                 result = HSO_PORT_DIAG;
2837                 break;
2838         case 0x2:
2839                 result = HSO_PORT_GPS;
2840                 break;
2841         case 0x3:
2842                 result = HSO_PORT_GPS_CONTROL;
2843                 break;
2844         case 0x4:
2845                 result = HSO_PORT_APP;
2846                 break;
2847         case 0x5:
2848                 result = HSO_PORT_APP2;
2849                 break;
2850         case 0x6:
2851                 result = HSO_PORT_CONTROL;
2852                 break;
2853         case 0x7:
2854                 result = HSO_PORT_NETWORK;
2855                 break;
2856         case 0x8:
2857                 result = HSO_PORT_MODEM;
2858                 break;
2859         case 0x9:
2860                 result = HSO_PORT_MSD;
2861                 break;
2862         case 0xa:
2863                 result = HSO_PORT_PCSC;
2864                 break;
2865         case 0xb:
2866                 result = HSO_PORT_VOICE;
2867                 break;
2868         default:
2869                 result = 0;
2870         }
2871 
2872         if (result)
2873                 result |= HSO_INTF_BULK;
2874 
2875         if (config_data[16] & 0x1)
2876                 result |= HSO_INFO_CRC_BUG;
2877 
2878         kfree(config_data);
2879         return result;
2880 }
2881 
2882 /* called once for each interface upon device insertion */
2883 static int hso_probe(struct usb_interface *interface,
2884                      const struct usb_device_id *id)
2885 {
2886         int mux, i, if_num, port_spec;
2887         unsigned char port_mask;
2888         struct hso_device *hso_dev = NULL;
2889         struct hso_shared_int *shared_int;
2890         struct hso_device *tmp_dev = NULL;
2891 
2892         if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
2893                 dev_err(&interface->dev, "Not our interface\n");
2894                 return -ENODEV;
2895         }
2896 
2897         if_num = interface->altsetting->desc.bInterfaceNumber;
2898 
2899         /* Get the interface/port specification from either driver_info or from
2900          * the device itself */
2901         if (id->driver_info)
2902                 port_spec = ((u32 *)(id->driver_info))[if_num];
2903         else
2904                 port_spec = hso_get_config_data(interface);
2905 
2906         /* Check if we need to switch to alt interfaces prior to port
2907          * configuration */
2908         if (interface->num_altsetting > 1)
2909                 usb_set_interface(interface_to_usbdev(interface), if_num, 1);
2910         interface->needs_remote_wakeup = 1;
2911 
2912         /* Allocate new hso device(s) */
2913         switch (port_spec & HSO_INTF_MASK) {
2914         case HSO_INTF_MUX:
2915                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2916                         /* Create the network device */
2917                         if (!disable_net) {
2918                                 hso_dev = hso_create_net_device(interface,
2919                                                                 port_spec);
2920                                 if (!hso_dev)
2921                                         goto exit;
2922                                 tmp_dev = hso_dev;
2923                         }
2924                 }
2925 
2926                 if (hso_get_mux_ports(interface, &port_mask))
2927                         /* TODO: de-allocate everything */
2928                         goto exit;
2929 
2930                 shared_int = hso_create_shared_int(interface);
2931                 if (!shared_int)
2932                         goto exit;
2933 
2934                 for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) {
2935                         if (port_mask & i) {
2936                                 hso_dev = hso_create_mux_serial_device(
2937                                                 interface, i, shared_int);
2938                                 if (!hso_dev)
2939                                         goto exit;
2940                         }
2941                 }
2942 
2943                 if (tmp_dev)
2944                         hso_dev = tmp_dev;
2945                 break;
2946 
2947         case HSO_INTF_BULK:
2948                 /* It's a regular bulk interface */
2949                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2950                         if (!disable_net)
2951                                 hso_dev =
2952                                     hso_create_net_device(interface, port_spec);
2953                 } else {
2954                         hso_dev =
2955                             hso_create_bulk_serial_device(interface, port_spec);
2956                 }
2957                 if (!hso_dev)
2958                         goto exit;
2959                 break;
2960         default:
2961                 goto exit;
2962         }
2963 
2964         /* save our data pointer in this device */
2965         usb_set_intfdata(interface, hso_dev);
2966 
2967         /* done */
2968         return 0;
2969 exit:
2970         hso_free_interface(interface);
2971         return -ENODEV;
2972 }
2973 
2974 /* device removed, cleaning up */
2975 static void hso_disconnect(struct usb_interface *interface)
2976 {
2977         hso_free_interface(interface);
2978 
2979         /* remove reference of our private data */
2980         usb_set_intfdata(interface, NULL);
2981 }
2982 
2983 static void async_get_intf(struct work_struct *data)
2984 {
2985         struct hso_device *hso_dev =
2986             container_of(data, struct hso_device, async_get_intf);
2987         usb_autopm_get_interface(hso_dev->interface);
2988 }
2989 
2990 static void async_put_intf(struct work_struct *data)
2991 {
2992         struct hso_device *hso_dev =
2993             container_of(data, struct hso_device, async_put_intf);
2994         usb_autopm_put_interface(hso_dev->interface);
2995 }
2996 
2997 static int hso_get_activity(struct hso_device *hso_dev)
2998 {
2999         if (hso_dev->usb->state == USB_STATE_SUSPENDED) {
3000                 if (!hso_dev->is_active) {
3001                         hso_dev->is_active = 1;
3002                         schedule_work(&hso_dev->async_get_intf);
3003                 }
3004         }
3005 
3006         if (hso_dev->usb->state != USB_STATE_CONFIGURED)
3007                 return -EAGAIN;
3008 
3009         usb_mark_last_busy(hso_dev->usb);
3010 
3011         return 0;
3012 }
3013 
3014 static int hso_put_activity(struct hso_device *hso_dev)
3015 {
3016         if (hso_dev->usb->state != USB_STATE_SUSPENDED) {
3017                 if (hso_dev->is_active) {
3018                         hso_dev->is_active = 0;
3019                         schedule_work(&hso_dev->async_put_intf);
3020                         return -EAGAIN;
3021                 }
3022         }
3023         hso_dev->is_active = 0;
3024         return 0;
3025 }
3026 
3027 /* called by kernel when we need to suspend device */
3028 static int hso_suspend(struct usb_interface *iface, pm_message_t message)
3029 {
3030         int i, result;
3031 
3032         /* Stop all serial ports */
3033         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3034                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3035                         result = hso_stop_serial_device(serial_table[i]);
3036                         if (result)
3037                                 goto out;
3038                 }
3039         }
3040 
3041         /* Stop all network ports */
3042         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3043                 if (network_table[i] &&
3044                     (network_table[i]->interface == iface)) {
3045                         result = hso_stop_net_device(network_table[i]);
3046                         if (result)
3047                                 goto out;
3048                 }
3049         }
3050 
3051 out:
3052         return 0;
3053 }
3054 
3055 /* called by kernel when we need to resume device */
3056 static int hso_resume(struct usb_interface *iface)
3057 {
3058         int i, result = 0;
3059         struct hso_net *hso_net;
3060 
3061         /* Start all serial ports */
3062         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3063                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3064                         if (dev2ser(serial_table[i])->port.count) {
3065                                 result =
3066                                     hso_start_serial_device(serial_table[i], GFP_NOIO);
3067                                 hso_kick_transmit(dev2ser(serial_table[i]));
3068                                 if (result)
3069                                         goto out;
3070                         }
3071                 }
3072         }
3073 
3074         /* Start all network ports */
3075         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3076                 if (network_table[i] &&
3077                     (network_table[i]->interface == iface)) {
3078                         hso_net = dev2net(network_table[i]);
3079                         if (hso_net->flags & IFF_UP) {
3080                                 /* First transmit any lingering data,
3081                                    then restart the device. */
3082                                 if (hso_net->skb_tx_buf) {
3083                                         dev_dbg(&iface->dev,
3084                                                 "Transmitting"
3085                                                 " lingering data\n");
3086                                         hso_net_start_xmit(hso_net->skb_tx_buf,
3087                                                            hso_net->net);
3088                                         hso_net->skb_tx_buf = NULL;
3089                                 }
3090                                 result = hso_start_net_device(network_table[i]);
3091                                 if (result)
3092                                         goto out;
3093                         }
3094                 }
3095         }
3096 
3097 out:
3098         return result;
3099 }
3100 
3101 static void reset_device(struct work_struct *data)
3102 {
3103         struct hso_device *hso_dev =
3104             container_of(data, struct hso_device, reset_device);
3105         struct usb_device *usb = hso_dev->usb;
3106         int result;
3107 
3108         if (hso_dev->usb_gone) {
3109                 D1("No reset during disconnect\n");
3110         } else {
3111                 result = usb_lock_device_for_reset(usb, hso_dev->interface);
3112                 if (result < 0)
3113                         D1("unable to lock device for reset: %d\n", result);
3114                 else {
3115                         usb_reset_device(usb);
3116                         usb_unlock_device(usb);
3117                 }
3118         }
3119 }
3120 
3121 static void hso_serial_ref_free(struct kref *ref)
3122 {
3123         struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
3124 
3125         hso_free_serial_device(hso_dev);
3126 }
3127 
3128 static void hso_free_interface(struct usb_interface *interface)
3129 {
3130         struct hso_serial *hso_dev;
3131         int i;
3132 
3133         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3134                 if (serial_table[i] &&
3135                     (serial_table[i]->interface == interface)) {
3136                         hso_dev = dev2ser(serial_table[i]);
3137                         tty_port_tty_hangup(&hso_dev->port, false);
3138                         mutex_lock(&hso_dev->parent->mutex);
3139                         hso_dev->parent->usb_gone = 1;
3140                         mutex_unlock(&hso_dev->parent->mutex);
3141                         kref_put(&serial_table[i]->ref, hso_serial_ref_free);
3142                 }
3143         }
3144 
3145         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3146                 if (network_table[i] &&
3147                     (network_table[i]->interface == interface)) {
3148                         struct rfkill *rfk = dev2net(network_table[i])->rfkill;
3149                         /* hso_stop_net_device doesn't stop the net queue since
3150                          * traffic needs to start it again when suspended */
3151                         netif_stop_queue(dev2net(network_table[i])->net);
3152                         hso_stop_net_device(network_table[i]);
3153                         cancel_work_sync(&network_table[i]->async_put_intf);
3154                         cancel_work_sync(&network_table[i]->async_get_intf);
3155                         if (rfk) {
3156                                 rfkill_unregister(rfk);
3157                                 rfkill_destroy(rfk);
3158                         }
3159                         hso_free_net_device(network_table[i]);
3160                 }
3161         }
3162 }
3163 
3164 /* Helper functions */
3165 
3166 /* Get the endpoint ! */
3167 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
3168                                                   int type, int dir)
3169 {
3170         int i;
3171         struct usb_host_interface *iface = intf->cur_altsetting;
3172         struct usb_endpoint_descriptor *endp;
3173 
3174         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3175                 endp = &iface->endpoint[i].desc;
3176                 if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) &&
3177                     (usb_endpoint_type(endp) == type))
3178                         return endp;
3179         }
3180 
3181         return NULL;
3182 }
3183 
3184 /* Get the byte that describes which ports are enabled */
3185 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports)
3186 {
3187         int i;
3188         struct usb_host_interface *iface = intf->cur_altsetting;
3189 
3190         if (iface->extralen == 3) {
3191                 *ports = iface->extra[2];
3192                 return 0;
3193         }
3194 
3195         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3196                 if (iface->endpoint[i].extralen == 3) {
3197                         *ports = iface->endpoint[i].extra[2];
3198                         return 0;
3199                 }
3200         }
3201 
3202         return -1;
3203 }
3204 
3205 /* interrupt urb needs to be submitted, used for serial read of muxed port */
3206 static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int,
3207                                    struct usb_device *usb, gfp_t gfp)
3208 {
3209         int result;
3210 
3211         usb_fill_int_urb(shared_int->shared_intr_urb, usb,
3212                          usb_rcvintpipe(usb,
3213                                 shared_int->intr_endp->bEndpointAddress & 0x7F),
3214                          shared_int->shared_intr_buf,
3215                          1,
3216                          intr_callback, shared_int,
3217                          shared_int->intr_endp->bInterval);
3218 
3219         result = usb_submit_urb(shared_int->shared_intr_urb, gfp);
3220         if (result)
3221                 dev_warn(&usb->dev, "%s failed mux_intr_urb %d\n", __func__,
3222                         result);
3223 
3224         return result;
3225 }
3226 
3227 /* operations setup of the serial interface */
3228 static const struct tty_operations hso_serial_ops = {
3229         .open = hso_serial_open,
3230         .close = hso_serial_close,
3231         .write = hso_serial_write,
3232         .write_room = hso_serial_write_room,
3233         .ioctl = hso_serial_ioctl,
3234         .set_termios = hso_serial_set_termios,
3235         .chars_in_buffer = hso_serial_chars_in_buffer,
3236         .tiocmget = hso_serial_tiocmget,
3237         .tiocmset = hso_serial_tiocmset,
3238         .get_icount = hso_get_count,
3239         .unthrottle = hso_unthrottle
3240 };
3241 
3242 static struct usb_driver hso_driver = {
3243         .name = driver_name,
3244         .probe = hso_probe,
3245         .disconnect = hso_disconnect,
3246         .id_table = hso_ids,
3247         .suspend = hso_suspend,
3248         .resume = hso_resume,
3249         .reset_resume = hso_resume,
3250         .supports_autosuspend = 1,
3251         .disable_hub_initiated_lpm = 1,
3252 };
3253 
3254 static int __init hso_init(void)
3255 {
3256         int i;
3257         int result;
3258 
3259         /* put it in the log */
3260         printk(KERN_INFO "hso: %s\n", version);
3261 
3262         /* Initialise the serial table semaphore and table */
3263         spin_lock_init(&serial_table_lock);
3264         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++)
3265                 serial_table[i] = NULL;
3266 
3267         /* allocate our driver using the proper amount of supported minors */
3268         tty_drv = alloc_tty_driver(HSO_SERIAL_TTY_MINORS);
3269         if (!tty_drv)
3270                 return -ENOMEM;
3271 
3272         /* fill in all needed values */
3273         tty_drv->driver_name = driver_name;
3274         tty_drv->name = tty_filename;
3275 
3276         /* if major number is provided as parameter, use that one */
3277         if (tty_major)
3278                 tty_drv->major = tty_major;
3279 
3280         tty_drv->minor_start = 0;
3281         tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
3282         tty_drv->subtype = SERIAL_TYPE_NORMAL;
3283         tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3284         tty_drv->init_termios = tty_std_termios;
3285         hso_init_termios(&tty_drv->init_termios);
3286         tty_set_operations(tty_drv, &hso_serial_ops);
3287 
3288         /* register the tty driver */
3289         result = tty_register_driver(tty_drv);
3290         if (result) {
3291                 printk(KERN_ERR "%s - tty_register_driver failed(%d)\n",
3292                         __func__, result);
3293                 goto err_free_tty;
3294         }
3295 
3296         /* register this module as an usb driver */
3297         result = usb_register(&hso_driver);
3298         if (result) {
3299                 printk(KERN_ERR "Could not register hso driver? error: %d\n",
3300                         result);
3301                 goto err_unreg_tty;
3302         }
3303 
3304         /* done */
3305         return 0;
3306 err_unreg_tty:
3307         tty_unregister_driver(tty_drv);
3308 err_free_tty:
3309         put_tty_driver(tty_drv);
3310         return result;
3311 }
3312 
3313 static void __exit hso_exit(void)
3314 {
3315         printk(KERN_INFO "hso: unloaded\n");
3316 
3317         tty_unregister_driver(tty_drv);
3318         put_tty_driver(tty_drv);
3319         /* deregister the usb driver */
3320         usb_deregister(&hso_driver);
3321 }
3322 
3323 /* Module definitions */
3324 module_init(hso_init);
3325 module_exit(hso_exit);
3326 
3327 MODULE_AUTHOR(MOD_AUTHOR);
3328 MODULE_DESCRIPTION(MOD_DESCRIPTION);
3329 MODULE_LICENSE(MOD_LICENSE);
3330 
3331 /* change the debug level (eg: insmod hso.ko debug=0x04) */
3332 MODULE_PARM_DESC(debug, "Level of debug [0x01 | 0x02 | 0x04 | 0x08 | 0x10]");
3333 module_param(debug, int, S_IRUGO | S_IWUSR);
3334 
3335 /* set the major tty number (eg: insmod hso.ko tty_major=245) */
3336 MODULE_PARM_DESC(tty_major, "Set the major tty number");
3337 module_param(tty_major, int, S_IRUGO | S_IWUSR);
3338 
3339 /* disable network interface (eg: insmod hso.ko disable_net=1) */
3340 MODULE_PARM_DESC(disable_net, "Disable the network interface");
3341 module_param(disable_net, int, S_IRUGO | S_IWUSR);
3342 

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