Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

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

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