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Linux/drivers/net/usb/hso.c

  1 /******************************************************************************
  2  *
  3  * Driver for Option High Speed Mobile Devices.
  4  *
  5  *  Copyright (C) 2008 Option International
  6  *                     Filip Aben <f.aben@option.com>
  7  *                     Denis Joseph Barrow <d.barow@option.com>
  8  *                     Jan Dumon <j.dumon@option.com>
  9  *  Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
 10  *                      <ajb@spheresystems.co.uk>
 11  *  Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
 12  *  Copyright (C) 2008 Novell, Inc.
 13  *
 14  *  This program is free software; you can redistribute it and/or modify
 15  *  it under the terms of the GNU General Public License version 2 as
 16  *  published by the Free Software Foundation.
 17  *
 18  *  This program is distributed in the hope that it will be useful,
 19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 21  *  GNU General Public License for more details.
 22  *
 23  *  You should have received a copy of the GNU General Public License
 24  *  along with this program; if not, write to the Free Software
 25  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 26  *  USA
 27  *
 28  *
 29  *****************************************************************************/
 30 
 31 /******************************************************************************
 32  *
 33  * Description of the device:
 34  *
 35  * Interface 0: Contains the IP network interface on the bulk end points.
 36  *              The multiplexed serial ports are using the interrupt and
 37  *              control endpoints.
 38  *              Interrupt contains a bitmap telling which multiplexed
 39  *              serialport needs servicing.
 40  *
 41  * Interface 1: Diagnostics port, uses bulk only, do not submit urbs until the
 42  *              port is opened, as this have a huge impact on the network port
 43  *              throughput.
 44  *
 45  * Interface 2: Standard modem interface - circuit switched interface, this
 46  *              can be used to make a standard ppp connection however it
 47  *              should not be used in conjunction with the IP network interface
 48  *              enabled for USB performance reasons i.e. if using this set
 49  *              ideally disable_net=1.
 50  *
 51  *****************************************************************************/
 52 
 53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 54 
 55 #include <linux/sched.h>
 56 #include <linux/slab.h>
 57 #include <linux/init.h>
 58 #include <linux/delay.h>
 59 #include <linux/netdevice.h>
 60 #include <linux/module.h>
 61 #include <linux/ethtool.h>
 62 #include <linux/usb.h>
 63 #include <linux/tty.h>
 64 #include <linux/tty_driver.h>
 65 #include <linux/tty_flip.h>
 66 #include <linux/kmod.h>
 67 #include <linux/rfkill.h>
 68 #include <linux/ip.h>
 69 #include <linux/uaccess.h>
 70 #include <linux/usb/cdc.h>
 71 #include <net/arp.h>
 72 #include <asm/byteorder.h>
 73 #include <linux/serial_core.h>
 74 #include <linux/serial.h>
 75 
 76 
 77 #define MOD_AUTHOR                      "Option Wireless"
 78 #define MOD_DESCRIPTION                 "USB High Speed Option driver"
 79 #define MOD_LICENSE                     "GPL"
 80 
 81 #define HSO_MAX_NET_DEVICES             10
 82 #define HSO__MAX_MTU                    2048
 83 #define DEFAULT_MTU                     1500
 84 #define DEFAULT_MRU                     1500
 85 
 86 #define CTRL_URB_RX_SIZE                1024
 87 #define CTRL_URB_TX_SIZE                64
 88 
 89 #define BULK_URB_RX_SIZE                4096
 90 #define BULK_URB_TX_SIZE                8192
 91 
 92 #define MUX_BULK_RX_BUF_SIZE            HSO__MAX_MTU
 93 #define MUX_BULK_TX_BUF_SIZE            HSO__MAX_MTU
 94 #define MUX_BULK_RX_BUF_COUNT           4
 95 #define USB_TYPE_OPTION_VENDOR          0x20
 96 
 97 /* These definitions are used with the struct hso_net flags element */
 98 /* - use *_bit operations on it. (bit indices not values.) */
 99 #define HSO_NET_RUNNING                 0
100 
101 #define HSO_NET_TX_TIMEOUT              (HZ*10)
102 
103 #define HSO_SERIAL_MAGIC                0x48534f31
104 
105 /* Number of ttys to handle */
106 #define HSO_SERIAL_TTY_MINORS           256
107 
108 #define MAX_RX_URBS                     2
109 
110 /*****************************************************************************/
111 /* Debugging functions                                                       */
112 /*****************************************************************************/
113 #define hso_dbg(lvl, fmt, ...)                                          \
114 do {                                                                    \
115         if ((lvl) & debug)                                              \
116                 pr_info("[%d:%s] " fmt,                                 \
117                         __LINE__, __func__, ##__VA_ARGS__);             \
118 } while (0)
119 
120 /*****************************************************************************/
121 /* Enumerators                                                               */
122 /*****************************************************************************/
123 enum pkt_parse_state {
124         WAIT_IP,
125         WAIT_DATA,
126         WAIT_SYNC
127 };
128 
129 /*****************************************************************************/
130 /* Structs                                                                   */
131 /*****************************************************************************/
132 
133 struct hso_shared_int {
134         struct usb_endpoint_descriptor *intr_endp;
135         void *shared_intr_buf;
136         struct urb *shared_intr_urb;
137         struct usb_device *usb;
138         int use_count;
139         int ref_count;
140         struct mutex shared_int_lock;
141 };
142 
143 struct hso_net {
144         struct hso_device *parent;
145         struct net_device *net;
146         struct rfkill *rfkill;
147         char name[24];
148 
149         struct usb_endpoint_descriptor *in_endp;
150         struct usb_endpoint_descriptor *out_endp;
151 
152         struct urb *mux_bulk_rx_urb_pool[MUX_BULK_RX_BUF_COUNT];
153         struct urb *mux_bulk_tx_urb;
154         void *mux_bulk_rx_buf_pool[MUX_BULK_RX_BUF_COUNT];
155         void *mux_bulk_tx_buf;
156 
157         struct sk_buff *skb_rx_buf;
158         struct sk_buff *skb_tx_buf;
159 
160         enum pkt_parse_state rx_parse_state;
161         spinlock_t net_lock;
162 
163         unsigned short rx_buf_size;
164         unsigned short rx_buf_missing;
165         struct iphdr rx_ip_hdr;
166 
167         unsigned long flags;
168 };
169 
170 enum rx_ctrl_state{
171         RX_IDLE,
172         RX_SENT,
173         RX_PENDING
174 };
175 
176 #define BM_REQUEST_TYPE (0xa1)
177 #define B_NOTIFICATION  (0x20)
178 #define W_VALUE         (0x0)
179 #define W_LENGTH        (0x2)
180 
181 #define B_OVERRUN       (0x1<<6)
182 #define B_PARITY        (0x1<<5)
183 #define B_FRAMING       (0x1<<4)
184 #define B_RING_SIGNAL   (0x1<<3)
185 #define B_BREAK         (0x1<<2)
186 #define B_TX_CARRIER    (0x1<<1)
187 #define B_RX_CARRIER    (0x1<<0)
188 
189 struct hso_serial_state_notification {
190         u8 bmRequestType;
191         u8 bNotification;
192         u16 wValue;
193         u16 wIndex;
194         u16 wLength;
195         u16 UART_state_bitmap;
196 } __packed;
197 
198 struct hso_tiocmget {
199         struct mutex mutex;
200         wait_queue_head_t waitq;
201         int    intr_completed;
202         struct usb_endpoint_descriptor *endp;
203         struct urb *urb;
204         struct hso_serial_state_notification serial_state_notification;
205         u16    prev_UART_state_bitmap;
206         struct uart_icount icount;
207 };
208 
209 
210 struct hso_serial {
211         struct hso_device *parent;
212         int magic;
213         u8 minor;
214 
215         struct hso_shared_int *shared_int;
216 
217         /* rx/tx urb could be either a bulk urb or a control urb depending
218            on which serial port it is used on. */
219         struct urb *rx_urb[MAX_RX_URBS];
220         u8 num_rx_urbs;
221         u8 *rx_data[MAX_RX_URBS];
222         u16 rx_data_length;     /* should contain allocated length */
223 
224         struct urb *tx_urb;
225         u8 *tx_data;
226         u8 *tx_buffer;
227         u16 tx_data_length;     /* should contain allocated length */
228         u16 tx_data_count;
229         u16 tx_buffer_count;
230         struct usb_ctrlrequest ctrl_req_tx;
231         struct usb_ctrlrequest ctrl_req_rx;
232 
233         struct usb_endpoint_descriptor *in_endp;
234         struct usb_endpoint_descriptor *out_endp;
235 
236         enum rx_ctrl_state rx_state;
237         u8 rts_state;
238         u8 dtr_state;
239         unsigned tx_urb_used:1;
240 
241         struct tty_port port;
242         /* from usb_serial_port */
243         spinlock_t serial_lock;
244 
245         int (*write_data) (struct hso_serial *serial);
246         struct hso_tiocmget  *tiocmget;
247         /* Hacks required to get flow control
248          * working on the serial receive buffers
249          * so as not to drop characters on the floor.
250          */
251         int  curr_rx_urb_idx;
252         u8   rx_urb_filled[MAX_RX_URBS];
253         struct tasklet_struct unthrottle_tasklet;
254 };
255 
256 struct hso_device {
257         union {
258                 struct hso_serial *dev_serial;
259                 struct hso_net *dev_net;
260         } port_data;
261 
262         u32 port_spec;
263 
264         u8 is_active;
265         u8 usb_gone;
266         struct work_struct async_get_intf;
267         struct work_struct async_put_intf;
268 
269         struct usb_device *usb;
270         struct usb_interface *interface;
271 
272         struct device *dev;
273         struct kref ref;
274         struct mutex mutex;
275 };
276 
277 /* Type of interface */
278 #define HSO_INTF_MASK           0xFF00
279 #define HSO_INTF_MUX            0x0100
280 #define HSO_INTF_BULK           0x0200
281 
282 /* Type of port */
283 #define HSO_PORT_MASK           0xFF
284 #define HSO_PORT_NO_PORT        0x0
285 #define HSO_PORT_CONTROL        0x1
286 #define HSO_PORT_APP            0x2
287 #define HSO_PORT_GPS            0x3
288 #define HSO_PORT_PCSC           0x4
289 #define HSO_PORT_APP2           0x5
290 #define HSO_PORT_GPS_CONTROL    0x6
291 #define HSO_PORT_MSD            0x7
292 #define HSO_PORT_VOICE          0x8
293 #define HSO_PORT_DIAG2          0x9
294 #define HSO_PORT_DIAG           0x10
295 #define HSO_PORT_MODEM          0x11
296 #define HSO_PORT_NETWORK        0x12
297 
298 /* Additional device info */
299 #define HSO_INFO_MASK           0xFF000000
300 #define HSO_INFO_CRC_BUG        0x01000000
301 
302 /*****************************************************************************/
303 /* Prototypes                                                                */
304 /*****************************************************************************/
305 /* Serial driver functions */
306 static int hso_serial_tiocmset(struct tty_struct *tty,
307                                unsigned int set, unsigned int clear);
308 static void ctrl_callback(struct urb *urb);
309 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial);
310 static void hso_kick_transmit(struct hso_serial *serial);
311 /* Helper functions */
312 static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
313                                    struct usb_device *usb, gfp_t gfp);
314 static void handle_usb_error(int status, const char *function,
315                              struct hso_device *hso_dev);
316 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
317                                                   int type, int dir);
318 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
319 static void hso_free_interface(struct usb_interface *intf);
320 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags);
321 static int hso_stop_serial_device(struct hso_device *hso_dev);
322 static int hso_start_net_device(struct hso_device *hso_dev);
323 static void hso_free_shared_int(struct hso_shared_int *shared_int);
324 static int hso_stop_net_device(struct hso_device *hso_dev);
325 static void hso_serial_ref_free(struct kref *ref);
326 static void hso_std_serial_read_bulk_callback(struct urb *urb);
327 static int hso_mux_serial_read(struct hso_serial *serial);
328 static void async_get_intf(struct work_struct *data);
329 static void async_put_intf(struct work_struct *data);
330 static int hso_put_activity(struct hso_device *hso_dev);
331 static int hso_get_activity(struct hso_device *hso_dev);
332 static void tiocmget_intr_callback(struct urb *urb);
333 /*****************************************************************************/
334 /* Helping functions                                                         */
335 /*****************************************************************************/
336 
337 /* #define DEBUG */
338 
339 static inline struct hso_net *dev2net(struct hso_device *hso_dev)
340 {
341         return hso_dev->port_data.dev_net;
342 }
343 
344 static inline struct hso_serial *dev2ser(struct hso_device *hso_dev)
345 {
346         return hso_dev->port_data.dev_serial;
347 }
348 
349 /* Debugging functions */
350 #ifdef DEBUG
351 static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
352                      unsigned int len)
353 {
354         static char name[255];
355 
356         sprintf(name, "hso[%d:%s]", line_count, func_name);
357         print_hex_dump_bytes(name, DUMP_PREFIX_NONE, buf, len);
358 }
359 
360 #define DUMP(buf_, len_)        \
361         dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_)
362 
363 #define DUMP1(buf_, len_)                       \
364         do {                                    \
365                 if (0x01 & debug)               \
366                         DUMP(buf_, len_);       \
367         } while (0)
368 #else
369 #define DUMP(buf_, len_)
370 #define DUMP1(buf_, len_)
371 #endif
372 
373 /* module parameters */
374 static int debug;
375 static int tty_major;
376 static int disable_net;
377 
378 /* driver info */
379 static const char driver_name[] = "hso";
380 static const char tty_filename[] = "ttyHS";
381 static const char *version = __FILE__ ": " MOD_AUTHOR;
382 /* the usb driver itself (registered in hso_init) */
383 static struct usb_driver hso_driver;
384 /* serial structures */
385 static struct tty_driver *tty_drv;
386 static struct hso_device *serial_table[HSO_SERIAL_TTY_MINORS];
387 static struct hso_device *network_table[HSO_MAX_NET_DEVICES];
388 static spinlock_t serial_table_lock;
389 
390 static const s32 default_port_spec[] = {
391         HSO_INTF_MUX | HSO_PORT_NETWORK,
392         HSO_INTF_BULK | HSO_PORT_DIAG,
393         HSO_INTF_BULK | HSO_PORT_MODEM,
394         0
395 };
396 
397 static const s32 icon321_port_spec[] = {
398         HSO_INTF_MUX | HSO_PORT_NETWORK,
399         HSO_INTF_BULK | HSO_PORT_DIAG2,
400         HSO_INTF_BULK | HSO_PORT_MODEM,
401         HSO_INTF_BULK | HSO_PORT_DIAG,
402         0
403 };
404 
405 #define default_port_device(vendor, product)    \
406         USB_DEVICE(vendor, product),    \
407                 .driver_info = (kernel_ulong_t)default_port_spec
408 
409 #define icon321_port_device(vendor, product)    \
410         USB_DEVICE(vendor, product),    \
411                 .driver_info = (kernel_ulong_t)icon321_port_spec
412 
413 /* list of devices we support */
414 static const struct usb_device_id hso_ids[] = {
415         {default_port_device(0x0af0, 0x6711)},
416         {default_port_device(0x0af0, 0x6731)},
417         {default_port_device(0x0af0, 0x6751)},
418         {default_port_device(0x0af0, 0x6771)},
419         {default_port_device(0x0af0, 0x6791)},
420         {default_port_device(0x0af0, 0x6811)},
421         {default_port_device(0x0af0, 0x6911)},
422         {default_port_device(0x0af0, 0x6951)},
423         {default_port_device(0x0af0, 0x6971)},
424         {default_port_device(0x0af0, 0x7011)},
425         {default_port_device(0x0af0, 0x7031)},
426         {default_port_device(0x0af0, 0x7051)},
427         {default_port_device(0x0af0, 0x7071)},
428         {default_port_device(0x0af0, 0x7111)},
429         {default_port_device(0x0af0, 0x7211)},
430         {default_port_device(0x0af0, 0x7251)},
431         {default_port_device(0x0af0, 0x7271)},
432         {default_port_device(0x0af0, 0x7311)},
433         {default_port_device(0x0af0, 0xc031)},  /* Icon-Edge */
434         {icon321_port_device(0x0af0, 0xd013)},  /* Module HSxPA */
435         {icon321_port_device(0x0af0, 0xd031)},  /* Icon-321 */
436         {icon321_port_device(0x0af0, 0xd033)},  /* Icon-322 */
437         {USB_DEVICE(0x0af0, 0x7301)},           /* GE40x */
438         {USB_DEVICE(0x0af0, 0x7361)},           /* GE40x */
439         {USB_DEVICE(0x0af0, 0x7381)},           /* GE40x */
440         {USB_DEVICE(0x0af0, 0x7401)},           /* GI 0401 */
441         {USB_DEVICE(0x0af0, 0x7501)},           /* GTM 382 */
442         {USB_DEVICE(0x0af0, 0x7601)},           /* GE40x */
443         {USB_DEVICE(0x0af0, 0x7701)},
444         {USB_DEVICE(0x0af0, 0x7706)},
445         {USB_DEVICE(0x0af0, 0x7801)},
446         {USB_DEVICE(0x0af0, 0x7901)},
447         {USB_DEVICE(0x0af0, 0x7A01)},
448         {USB_DEVICE(0x0af0, 0x7A05)},
449         {USB_DEVICE(0x0af0, 0x8200)},
450         {USB_DEVICE(0x0af0, 0x8201)},
451         {USB_DEVICE(0x0af0, 0x8300)},
452         {USB_DEVICE(0x0af0, 0x8302)},
453         {USB_DEVICE(0x0af0, 0x8304)},
454         {USB_DEVICE(0x0af0, 0x8400)},
455         {USB_DEVICE(0x0af0, 0x8600)},
456         {USB_DEVICE(0x0af0, 0x8800)},
457         {USB_DEVICE(0x0af0, 0x8900)},
458         {USB_DEVICE(0x0af0, 0x9000)},
459         {USB_DEVICE(0x0af0, 0x9200)},           /* Option GTM671WFS */
460         {USB_DEVICE(0x0af0, 0xd035)},
461         {USB_DEVICE(0x0af0, 0xd055)},
462         {USB_DEVICE(0x0af0, 0xd155)},
463         {USB_DEVICE(0x0af0, 0xd255)},
464         {USB_DEVICE(0x0af0, 0xd057)},
465         {USB_DEVICE(0x0af0, 0xd157)},
466         {USB_DEVICE(0x0af0, 0xd257)},
467         {USB_DEVICE(0x0af0, 0xd357)},
468         {USB_DEVICE(0x0af0, 0xd058)},
469         {USB_DEVICE(0x0af0, 0xc100)},
470         {}
471 };
472 MODULE_DEVICE_TABLE(usb, hso_ids);
473 
474 /* Sysfs attribute */
475 static ssize_t hso_sysfs_show_porttype(struct device *dev,
476                                        struct device_attribute *attr,
477                                        char *buf)
478 {
479         struct hso_device *hso_dev = dev_get_drvdata(dev);
480         char *port_name;
481 
482         if (!hso_dev)
483                 return 0;
484 
485         switch (hso_dev->port_spec & HSO_PORT_MASK) {
486         case HSO_PORT_CONTROL:
487                 port_name = "Control";
488                 break;
489         case HSO_PORT_APP:
490                 port_name = "Application";
491                 break;
492         case HSO_PORT_APP2:
493                 port_name = "Application2";
494                 break;
495         case HSO_PORT_GPS:
496                 port_name = "GPS";
497                 break;
498         case HSO_PORT_GPS_CONTROL:
499                 port_name = "GPS Control";
500                 break;
501         case HSO_PORT_PCSC:
502                 port_name = "PCSC";
503                 break;
504         case HSO_PORT_DIAG:
505                 port_name = "Diagnostic";
506                 break;
507         case HSO_PORT_DIAG2:
508                 port_name = "Diagnostic2";
509                 break;
510         case HSO_PORT_MODEM:
511                 port_name = "Modem";
512                 break;
513         case HSO_PORT_NETWORK:
514                 port_name = "Network";
515                 break;
516         default:
517                 port_name = "Unknown";
518                 break;
519         }
520 
521         return sprintf(buf, "%s\n", port_name);
522 }
523 static DEVICE_ATTR(hsotype, S_IRUGO, hso_sysfs_show_porttype, NULL);
524 
525 static struct attribute *hso_serial_dev_attrs[] = {
526         &dev_attr_hsotype.attr,
527         NULL
528 };
529 
530 ATTRIBUTE_GROUPS(hso_serial_dev);
531 
532 static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb)
533 {
534         int idx;
535 
536         for (idx = 0; idx < serial->num_rx_urbs; idx++)
537                 if (serial->rx_urb[idx] == urb)
538                         return idx;
539         dev_err(serial->parent->dev, "hso_urb_to_index failed\n");
540         return -1;
541 }
542 
543 /* converts mux value to a port spec value */
544 static u32 hso_mux_to_port(int mux)
545 {
546         u32 result;
547 
548         switch (mux) {
549         case 0x1:
550                 result = HSO_PORT_CONTROL;
551                 break;
552         case 0x2:
553                 result = HSO_PORT_APP;
554                 break;
555         case 0x4:
556                 result = HSO_PORT_PCSC;
557                 break;
558         case 0x8:
559                 result = HSO_PORT_GPS;
560                 break;
561         case 0x10:
562                 result = HSO_PORT_APP2;
563                 break;
564         default:
565                 result = HSO_PORT_NO_PORT;
566         }
567         return result;
568 }
569 
570 /* converts port spec value to a mux value */
571 static u32 hso_port_to_mux(int port)
572 {
573         u32 result;
574 
575         switch (port & HSO_PORT_MASK) {
576         case HSO_PORT_CONTROL:
577                 result = 0x0;
578                 break;
579         case HSO_PORT_APP:
580                 result = 0x1;
581                 break;
582         case HSO_PORT_PCSC:
583                 result = 0x2;
584                 break;
585         case HSO_PORT_GPS:
586                 result = 0x3;
587                 break;
588         case HSO_PORT_APP2:
589                 result = 0x4;
590                 break;
591         default:
592                 result = 0x0;
593         }
594         return result;
595 }
596 
597 static struct hso_serial *get_serial_by_shared_int_and_type(
598                                         struct hso_shared_int *shared_int,
599                                         int mux)
600 {
601         int i, port;
602 
603         port = hso_mux_to_port(mux);
604 
605         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
606                 if (serial_table[i] &&
607                     (dev2ser(serial_table[i])->shared_int == shared_int) &&
608                     ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) {
609                         return dev2ser(serial_table[i]);
610                 }
611         }
612 
613         return NULL;
614 }
615 
616 static struct hso_serial *get_serial_by_index(unsigned index)
617 {
618         struct hso_serial *serial = NULL;
619         unsigned long flags;
620 
621         spin_lock_irqsave(&serial_table_lock, flags);
622         if (serial_table[index])
623                 serial = dev2ser(serial_table[index]);
624         spin_unlock_irqrestore(&serial_table_lock, flags);
625 
626         return serial;
627 }
628 
629 static int get_free_serial_index(void)
630 {
631         int index;
632         unsigned long flags;
633 
634         spin_lock_irqsave(&serial_table_lock, flags);
635         for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
636                 if (serial_table[index] == NULL) {
637                         spin_unlock_irqrestore(&serial_table_lock, flags);
638                         return index;
639                 }
640         }
641         spin_unlock_irqrestore(&serial_table_lock, flags);
642 
643         pr_err("%s: no free serial devices in table\n", __func__);
644         return -1;
645 }
646 
647 static void set_serial_by_index(unsigned index, struct hso_serial *serial)
648 {
649         unsigned long flags;
650 
651         spin_lock_irqsave(&serial_table_lock, flags);
652         if (serial)
653                 serial_table[index] = serial->parent;
654         else
655                 serial_table[index] = NULL;
656         spin_unlock_irqrestore(&serial_table_lock, flags);
657 }
658 
659 static void handle_usb_error(int status, const char *function,
660                              struct hso_device *hso_dev)
661 {
662         char *explanation;
663 
664         switch (status) {
665         case -ENODEV:
666                 explanation = "no device";
667                 break;
668         case -ENOENT:
669                 explanation = "endpoint not enabled";
670                 break;
671         case -EPIPE:
672                 explanation = "endpoint stalled";
673                 break;
674         case -ENOSPC:
675                 explanation = "not enough bandwidth";
676                 break;
677         case -ESHUTDOWN:
678                 explanation = "device disabled";
679                 break;
680         case -EHOSTUNREACH:
681                 explanation = "device suspended";
682                 break;
683         case -EINVAL:
684         case -EAGAIN:
685         case -EFBIG:
686         case -EMSGSIZE:
687                 explanation = "internal error";
688                 break;
689         case -EILSEQ:
690         case -EPROTO:
691         case -ETIME:
692         case -ETIMEDOUT:
693                 explanation = "protocol error";
694                 if (hso_dev)
695                         usb_queue_reset_device(hso_dev->interface);
696                 break;
697         default:
698                 explanation = "unknown status";
699                 break;
700         }
701 
702         /* log a meaningful explanation of an USB status */
703         hso_dbg(0x1, "%s: received USB status - %s (%d)\n",
704                 function, explanation, status);
705 }
706 
707 /* Network interface functions */
708 
709 /* called when net interface is brought up by ifconfig */
710 static int hso_net_open(struct net_device *net)
711 {
712         struct hso_net *odev = netdev_priv(net);
713         unsigned long flags = 0;
714 
715         if (!odev) {
716                 dev_err(&net->dev, "No net device !\n");
717                 return -ENODEV;
718         }
719 
720         odev->skb_tx_buf = NULL;
721 
722         /* setup environment */
723         spin_lock_irqsave(&odev->net_lock, flags);
724         odev->rx_parse_state = WAIT_IP;
725         odev->rx_buf_size = 0;
726         odev->rx_buf_missing = sizeof(struct iphdr);
727         spin_unlock_irqrestore(&odev->net_lock, flags);
728 
729         /* We are up and running. */
730         set_bit(HSO_NET_RUNNING, &odev->flags);
731         hso_start_net_device(odev->parent);
732 
733         /* Tell the kernel we are ready to start receiving from it */
734         netif_start_queue(net);
735 
736         return 0;
737 }
738 
739 /* called when interface is brought down by ifconfig */
740 static int hso_net_close(struct net_device *net)
741 {
742         struct hso_net *odev = netdev_priv(net);
743 
744         /* we don't need the queue anymore */
745         netif_stop_queue(net);
746         /* no longer running */
747         clear_bit(HSO_NET_RUNNING, &odev->flags);
748 
749         hso_stop_net_device(odev->parent);
750 
751         /* done */
752         return 0;
753 }
754 
755 /* USB tells is xmit done, we should start the netqueue again */
756 static void write_bulk_callback(struct urb *urb)
757 {
758         struct hso_net *odev = urb->context;
759         int status = urb->status;
760 
761         /* Sanity check */
762         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
763                 dev_err(&urb->dev->dev, "%s: device not running\n", __func__);
764                 return;
765         }
766 
767         /* Do we still have a valid kernel network device? */
768         if (!netif_device_present(odev->net)) {
769                 dev_err(&urb->dev->dev, "%s: net device not present\n",
770                         __func__);
771                 return;
772         }
773 
774         /* log status, but don't act on it, we don't need to resubmit anything
775          * anyhow */
776         if (status)
777                 handle_usb_error(status, __func__, odev->parent);
778 
779         hso_put_activity(odev->parent);
780 
781         /* Tell the network interface we are ready for another frame */
782         netif_wake_queue(odev->net);
783 }
784 
785 /* called by kernel when we need to transmit a packet */
786 static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb,
787                                             struct net_device *net)
788 {
789         struct hso_net *odev = netdev_priv(net);
790         int result;
791 
792         /* Tell the kernel, "No more frames 'til we are done with this one." */
793         netif_stop_queue(net);
794         if (hso_get_activity(odev->parent) == -EAGAIN) {
795                 odev->skb_tx_buf = skb;
796                 return NETDEV_TX_OK;
797         }
798 
799         /* log if asked */
800         DUMP1(skb->data, skb->len);
801         /* Copy it from kernel memory to OUR memory */
802         memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len);
803         hso_dbg(0x1, "len: %d/%d\n", skb->len, MUX_BULK_TX_BUF_SIZE);
804 
805         /* Fill in the URB for shipping it out. */
806         usb_fill_bulk_urb(odev->mux_bulk_tx_urb,
807                           odev->parent->usb,
808                           usb_sndbulkpipe(odev->parent->usb,
809                                           odev->out_endp->
810                                           bEndpointAddress & 0x7F),
811                           odev->mux_bulk_tx_buf, skb->len, write_bulk_callback,
812                           odev);
813 
814         /* Deal with the Zero Length packet problem, I hope */
815         odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET;
816 
817         /* Send the URB on its merry way. */
818         result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC);
819         if (result) {
820                 dev_warn(&odev->parent->interface->dev,
821                         "failed mux_bulk_tx_urb %d\n", result);
822                 net->stats.tx_errors++;
823                 netif_start_queue(net);
824         } else {
825                 net->stats.tx_packets++;
826                 net->stats.tx_bytes += skb->len;
827         }
828         dev_kfree_skb(skb);
829         /* we're done */
830         return NETDEV_TX_OK;
831 }
832 
833 static const struct ethtool_ops ops = {
834         .get_link = ethtool_op_get_link
835 };
836 
837 /* called when a packet did not ack after watchdogtimeout */
838 static void hso_net_tx_timeout(struct net_device *net)
839 {
840         struct hso_net *odev = netdev_priv(net);
841 
842         if (!odev)
843                 return;
844 
845         /* Tell syslog we are hosed. */
846         dev_warn(&net->dev, "Tx timed out.\n");
847 
848         /* Tear the waiting frame off the list */
849         if (odev->mux_bulk_tx_urb &&
850             (odev->mux_bulk_tx_urb->status == -EINPROGRESS))
851                 usb_unlink_urb(odev->mux_bulk_tx_urb);
852 
853         /* Update statistics */
854         net->stats.tx_errors++;
855 }
856 
857 /* make a real packet from the received USB buffer */
858 static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
859                         unsigned int count, unsigned char is_eop)
860 {
861         unsigned short temp_bytes;
862         unsigned short buffer_offset = 0;
863         unsigned short frame_len;
864         unsigned char *tmp_rx_buf;
865 
866         /* log if needed */
867         hso_dbg(0x1, "Rx %d bytes\n", count);
868         DUMP(ip_pkt, min(128, (int)count));
869 
870         while (count) {
871                 switch (odev->rx_parse_state) {
872                 case WAIT_IP:
873                         /* waiting for IP header. */
874                         /* wanted bytes - size of ip header */
875                         temp_bytes =
876                             (count <
877                              odev->rx_buf_missing) ? count : odev->
878                             rx_buf_missing;
879 
880                         memcpy(((unsigned char *)(&odev->rx_ip_hdr)) +
881                                odev->rx_buf_size, ip_pkt + buffer_offset,
882                                temp_bytes);
883 
884                         odev->rx_buf_size += temp_bytes;
885                         buffer_offset += temp_bytes;
886                         odev->rx_buf_missing -= temp_bytes;
887                         count -= temp_bytes;
888 
889                         if (!odev->rx_buf_missing) {
890                                 /* header is complete allocate an sk_buffer and
891                                  * continue to WAIT_DATA */
892                                 frame_len = ntohs(odev->rx_ip_hdr.tot_len);
893 
894                                 if ((frame_len > DEFAULT_MRU) ||
895                                     (frame_len < sizeof(struct iphdr))) {
896                                         dev_err(&odev->net->dev,
897                                                 "Invalid frame (%d) length\n",
898                                                 frame_len);
899                                         odev->rx_parse_state = WAIT_SYNC;
900                                         continue;
901                                 }
902                                 /* Allocate an sk_buff */
903                                 odev->skb_rx_buf = netdev_alloc_skb(odev->net,
904                                                                     frame_len);
905                                 if (!odev->skb_rx_buf) {
906                                         /* We got no receive buffer. */
907                                         hso_dbg(0x1, "could not allocate memory\n");
908                                         odev->rx_parse_state = WAIT_SYNC;
909                                         continue;
910                                 }
911 
912                                 /* Copy what we got so far. make room for iphdr
913                                  * after tail. */
914                                 tmp_rx_buf =
915                                     skb_put(odev->skb_rx_buf,
916                                             sizeof(struct iphdr));
917                                 memcpy(tmp_rx_buf, (char *)&(odev->rx_ip_hdr),
918                                        sizeof(struct iphdr));
919 
920                                 /* ETH_HLEN */
921                                 odev->rx_buf_size = sizeof(struct iphdr);
922 
923                                 /* Filip actually use .tot_len */
924                                 odev->rx_buf_missing =
925                                     frame_len - sizeof(struct iphdr);
926                                 odev->rx_parse_state = WAIT_DATA;
927                         }
928                         break;
929 
930                 case WAIT_DATA:
931                         temp_bytes = (count < odev->rx_buf_missing)
932                                         ? count : odev->rx_buf_missing;
933 
934                         /* Copy the rest of the bytes that are left in the
935                          * buffer into the waiting sk_buf. */
936                         /* Make room for temp_bytes after tail. */
937                         tmp_rx_buf = skb_put(odev->skb_rx_buf, temp_bytes);
938                         memcpy(tmp_rx_buf, ip_pkt + buffer_offset, temp_bytes);
939 
940                         odev->rx_buf_missing -= temp_bytes;
941                         count -= temp_bytes;
942                         buffer_offset += temp_bytes;
943                         odev->rx_buf_size += temp_bytes;
944                         if (!odev->rx_buf_missing) {
945                                 /* Packet is complete. Inject into stack. */
946                                 /* We have IP packet here */
947                                 odev->skb_rx_buf->protocol = cpu_to_be16(ETH_P_IP);
948                                 skb_reset_mac_header(odev->skb_rx_buf);
949 
950                                 /* Ship it off to the kernel */
951                                 netif_rx(odev->skb_rx_buf);
952                                 /* No longer our buffer. */
953                                 odev->skb_rx_buf = NULL;
954 
955                                 /* update out statistics */
956                                 odev->net->stats.rx_packets++;
957 
958                                 odev->net->stats.rx_bytes += odev->rx_buf_size;
959 
960                                 odev->rx_buf_size = 0;
961                                 odev->rx_buf_missing = sizeof(struct iphdr);
962                                 odev->rx_parse_state = WAIT_IP;
963                         }
964                         break;
965 
966                 case WAIT_SYNC:
967                         hso_dbg(0x1, " W_S\n");
968                         count = 0;
969                         break;
970                 default:
971                         hso_dbg(0x1, "\n");
972                         count--;
973                         break;
974                 }
975         }
976 
977         /* Recovery mechanism for WAIT_SYNC state. */
978         if (is_eop) {
979                 if (odev->rx_parse_state == WAIT_SYNC) {
980                         odev->rx_parse_state = WAIT_IP;
981                         odev->rx_buf_size = 0;
982                         odev->rx_buf_missing = sizeof(struct iphdr);
983                 }
984         }
985 }
986 
987 static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
988 {
989         static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
990         u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
991 
992         if (((rest == 5) || (rest == 6)) &&
993             !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,
994                     crc_check, 4)) {
995                 urb->actual_length -= 4;
996         }
997 }
998 
999 /* Moving data from usb to kernel (in interrupt state) */
1000 static void read_bulk_callback(struct urb *urb)
1001 {
1002         struct hso_net *odev = urb->context;
1003         struct net_device *net;
1004         int result;
1005         int status = urb->status;
1006 
1007         /* is al ok?  (Filip: Who's Al ?) */
1008         if (status) {
1009                 handle_usb_error(status, __func__, odev->parent);
1010                 return;
1011         }
1012 
1013         /* Sanity check */
1014         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
1015                 hso_dbg(0x1, "BULK IN callback but driver is not active!\n");
1016                 return;
1017         }
1018         usb_mark_last_busy(urb->dev);
1019 
1020         net = odev->net;
1021 
1022         if (!netif_device_present(net)) {
1023                 /* Somebody killed our network interface... */
1024                 return;
1025         }
1026 
1027         if (odev->parent->port_spec & HSO_INFO_CRC_BUG)
1028                 fix_crc_bug(urb, odev->in_endp->wMaxPacketSize);
1029 
1030         /* do we even have a packet? */
1031         if (urb->actual_length) {
1032                 /* Handle the IP stream, add header and push it onto network
1033                  * stack if the packet is complete. */
1034                 spin_lock(&odev->net_lock);
1035                 packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
1036                             (urb->transfer_buffer_length >
1037                              urb->actual_length) ? 1 : 0);
1038                 spin_unlock(&odev->net_lock);
1039         }
1040 
1041         /* We are done with this URB, resubmit it. Prep the USB to wait for
1042          * another frame. Reuse same as received. */
1043         usb_fill_bulk_urb(urb,
1044                           odev->parent->usb,
1045                           usb_rcvbulkpipe(odev->parent->usb,
1046                                           odev->in_endp->
1047                                           bEndpointAddress & 0x7F),
1048                           urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE,
1049                           read_bulk_callback, odev);
1050 
1051         /* Give this to the USB subsystem so it can tell us when more data
1052          * arrives. */
1053         result = usb_submit_urb(urb, GFP_ATOMIC);
1054         if (result)
1055                 dev_warn(&odev->parent->interface->dev,
1056                          "%s failed submit mux_bulk_rx_urb %d\n", __func__,
1057                          result);
1058 }
1059 
1060 /* Serial driver functions */
1061 
1062 static void hso_init_termios(struct ktermios *termios)
1063 {
1064         /*
1065          * The default requirements for this device are:
1066          */
1067         termios->c_iflag &=
1068                 ~(IGNBRK        /* disable ignore break */
1069                 | BRKINT        /* disable break causes interrupt */
1070                 | PARMRK        /* disable mark parity errors */
1071                 | ISTRIP        /* disable clear high bit of input characters */
1072                 | INLCR         /* disable translate NL to CR */
1073                 | IGNCR         /* disable ignore CR */
1074                 | ICRNL         /* disable translate CR to NL */
1075                 | IXON);        /* disable enable XON/XOFF flow control */
1076 
1077         /* disable postprocess output characters */
1078         termios->c_oflag &= ~OPOST;
1079 
1080         termios->c_lflag &=
1081                 ~(ECHO          /* disable echo input characters */
1082                 | ECHONL        /* disable echo new line */
1083                 | ICANON        /* disable erase, kill, werase, and rprnt
1084                                    special characters */
1085                 | ISIG          /* disable interrupt, quit, and suspend special
1086                                    characters */
1087                 | IEXTEN);      /* disable non-POSIX special characters */
1088 
1089         termios->c_cflag &=
1090                 ~(CSIZE         /* no size */
1091                 | PARENB        /* disable parity bit */
1092                 | CBAUD         /* clear current baud rate */
1093                 | CBAUDEX);     /* clear current buad rate */
1094 
1095         termios->c_cflag |= CS8;        /* character size 8 bits */
1096 
1097         /* baud rate 115200 */
1098         tty_termios_encode_baud_rate(termios, 115200, 115200);
1099 }
1100 
1101 static void _hso_serial_set_termios(struct tty_struct *tty,
1102                                     struct ktermios *old)
1103 {
1104         struct hso_serial *serial = tty->driver_data;
1105 
1106         if (!serial) {
1107                 pr_err("%s: no tty structures", __func__);
1108                 return;
1109         }
1110 
1111         hso_dbg(0x8, "port %d\n", serial->minor);
1112 
1113         /*
1114          *      Fix up unsupported bits
1115          */
1116         tty->termios.c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */
1117 
1118         tty->termios.c_cflag &=
1119                 ~(CSIZE         /* no size */
1120                 | PARENB        /* disable parity bit */
1121                 | CBAUD         /* clear current baud rate */
1122                 | CBAUDEX);     /* clear current buad rate */
1123 
1124         tty->termios.c_cflag |= CS8;    /* character size 8 bits */
1125 
1126         /* baud rate 115200 */
1127         tty_encode_baud_rate(tty, 115200, 115200);
1128 }
1129 
1130 static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb)
1131 {
1132         int result;
1133         /* We are done with this URB, resubmit it. Prep the USB to wait for
1134          * another frame */
1135         usb_fill_bulk_urb(urb, serial->parent->usb,
1136                           usb_rcvbulkpipe(serial->parent->usb,
1137                                           serial->in_endp->
1138                                           bEndpointAddress & 0x7F),
1139                           urb->transfer_buffer, serial->rx_data_length,
1140                           hso_std_serial_read_bulk_callback, serial);
1141         /* Give this to the USB subsystem so it can tell us when more data
1142          * arrives. */
1143         result = usb_submit_urb(urb, GFP_ATOMIC);
1144         if (result) {
1145                 dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n",
1146                         __func__, result);
1147         }
1148 }
1149 
1150 
1151 
1152 
1153 static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial)
1154 {
1155         int count;
1156         struct urb *curr_urb;
1157 
1158         while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) {
1159                 curr_urb = serial->rx_urb[serial->curr_rx_urb_idx];
1160                 count = put_rxbuf_data(curr_urb, serial);
1161                 if (count == -1)
1162                         return;
1163                 if (count == 0) {
1164                         serial->curr_rx_urb_idx++;
1165                         if (serial->curr_rx_urb_idx >= serial->num_rx_urbs)
1166                                 serial->curr_rx_urb_idx = 0;
1167                         hso_resubmit_rx_bulk_urb(serial, curr_urb);
1168                 }
1169         }
1170 }
1171 
1172 static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
1173 {
1174         int count = 0;
1175         struct urb *urb;
1176 
1177         urb = serial->rx_urb[0];
1178         if (serial->port.count > 0) {
1179                 count = put_rxbuf_data(urb, serial);
1180                 if (count == -1)
1181                         return;
1182         }
1183         /* Re issue a read as long as we receive data. */
1184 
1185         if (count == 0 && ((urb->actual_length != 0) ||
1186                            (serial->rx_state == RX_PENDING))) {
1187                 serial->rx_state = RX_SENT;
1188                 hso_mux_serial_read(serial);
1189         } else
1190                 serial->rx_state = RX_IDLE;
1191 }
1192 
1193 
1194 /* read callback for Diag and CS port */
1195 static void hso_std_serial_read_bulk_callback(struct urb *urb)
1196 {
1197         struct hso_serial *serial = urb->context;
1198         int status = urb->status;
1199 
1200         hso_dbg(0x8, "--- Got serial_read_bulk callback %02x ---\n", status);
1201 
1202         /* sanity check */
1203         if (!serial) {
1204                 hso_dbg(0x1, "serial == NULL\n");
1205                 return;
1206         }
1207         if (status) {
1208                 handle_usb_error(status, __func__, serial->parent);
1209                 return;
1210         }
1211 
1212         hso_dbg(0x1, "Actual length = %d\n", urb->actual_length);
1213         DUMP1(urb->transfer_buffer, urb->actual_length);
1214 
1215         /* Anyone listening? */
1216         if (serial->port.count == 0)
1217                 return;
1218 
1219         if (serial->parent->port_spec & HSO_INFO_CRC_BUG)
1220                 fix_crc_bug(urb, serial->in_endp->wMaxPacketSize);
1221         /* Valid data, handle RX data */
1222         spin_lock(&serial->serial_lock);
1223         serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;
1224         put_rxbuf_data_and_resubmit_bulk_urb(serial);
1225         spin_unlock(&serial->serial_lock);
1226 }
1227 
1228 /*
1229  * This needs to be a tasklet otherwise we will
1230  * end up recursively calling this function.
1231  */
1232 static void hso_unthrottle_tasklet(struct hso_serial *serial)
1233 {
1234         unsigned long flags;
1235 
1236         spin_lock_irqsave(&serial->serial_lock, flags);
1237         if ((serial->parent->port_spec & HSO_INTF_MUX))
1238                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1239         else
1240                 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1241         spin_unlock_irqrestore(&serial->serial_lock, flags);
1242 }
1243 
1244 static  void hso_unthrottle(struct tty_struct *tty)
1245 {
1246         struct hso_serial *serial = tty->driver_data;
1247 
1248         tasklet_hi_schedule(&serial->unthrottle_tasklet);
1249 }
1250 
1251 /* open the requested serial port */
1252 static int hso_serial_open(struct tty_struct *tty, struct file *filp)
1253 {
1254         struct hso_serial *serial = get_serial_by_index(tty->index);
1255         int result;
1256 
1257         /* sanity check */
1258         if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
1259                 WARN_ON(1);
1260                 tty->driver_data = NULL;
1261                 hso_dbg(0x1, "Failed to open port\n");
1262                 return -ENODEV;
1263         }
1264 
1265         mutex_lock(&serial->parent->mutex);
1266         result = usb_autopm_get_interface(serial->parent->interface);
1267         if (result < 0)
1268                 goto err_out;
1269 
1270         hso_dbg(0x1, "Opening %d\n", serial->minor);
1271 
1272         /* setup */
1273         tty->driver_data = serial;
1274         tty_port_tty_set(&serial->port, tty);
1275 
1276         /* check for port already opened, if not set the termios */
1277         serial->port.count++;
1278         if (serial->port.count == 1) {
1279                 serial->rx_state = RX_IDLE;
1280                 /* Force default termio settings */
1281                 _hso_serial_set_termios(tty, NULL);
1282                 tasklet_init(&serial->unthrottle_tasklet,
1283                              (void (*)(unsigned long))hso_unthrottle_tasklet,
1284                              (unsigned long)serial);
1285                 result = hso_start_serial_device(serial->parent, GFP_KERNEL);
1286                 if (result) {
1287                         hso_stop_serial_device(serial->parent);
1288                         serial->port.count--;
1289                 } else {
1290                         kref_get(&serial->parent->ref);
1291                 }
1292         } else {
1293                 hso_dbg(0x1, "Port was already open\n");
1294         }
1295 
1296         usb_autopm_put_interface(serial->parent->interface);
1297 
1298         /* done */
1299         if (result)
1300                 hso_serial_tiocmset(tty, TIOCM_RTS | TIOCM_DTR, 0);
1301 err_out:
1302         mutex_unlock(&serial->parent->mutex);
1303         return result;
1304 }
1305 
1306 /* close the requested serial port */
1307 static void hso_serial_close(struct tty_struct *tty, struct file *filp)
1308 {
1309         struct hso_serial *serial = tty->driver_data;
1310         u8 usb_gone;
1311 
1312         hso_dbg(0x1, "Closing serial port\n");
1313 
1314         /* Open failed, no close cleanup required */
1315         if (serial == NULL)
1316                 return;
1317 
1318         mutex_lock(&serial->parent->mutex);
1319         usb_gone = serial->parent->usb_gone;
1320 
1321         if (!usb_gone)
1322                 usb_autopm_get_interface(serial->parent->interface);
1323 
1324         /* reset the rts and dtr */
1325         /* do the actual close */
1326         serial->port.count--;
1327 
1328         if (serial->port.count <= 0) {
1329                 serial->port.count = 0;
1330                 tty_port_tty_set(&serial->port, NULL);
1331                 if (!usb_gone)
1332                         hso_stop_serial_device(serial->parent);
1333                 tasklet_kill(&serial->unthrottle_tasklet);
1334         }
1335 
1336         if (!usb_gone)
1337                 usb_autopm_put_interface(serial->parent->interface);
1338 
1339         mutex_unlock(&serial->parent->mutex);
1340 }
1341 
1342 /* close the requested serial port */
1343 static int hso_serial_write(struct tty_struct *tty, const unsigned char *buf,
1344                             int count)
1345 {
1346         struct hso_serial *serial = tty->driver_data;
1347         int space, tx_bytes;
1348         unsigned long flags;
1349 
1350         /* sanity check */
1351         if (serial == NULL) {
1352                 pr_err("%s: serial is NULL\n", __func__);
1353                 return -ENODEV;
1354         }
1355 
1356         spin_lock_irqsave(&serial->serial_lock, flags);
1357 
1358         space = serial->tx_data_length - serial->tx_buffer_count;
1359         tx_bytes = (count < space) ? count : space;
1360 
1361         if (!tx_bytes)
1362                 goto out;
1363 
1364         memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, tx_bytes);
1365         serial->tx_buffer_count += tx_bytes;
1366 
1367 out:
1368         spin_unlock_irqrestore(&serial->serial_lock, flags);
1369 
1370         hso_kick_transmit(serial);
1371         /* done */
1372         return tx_bytes;
1373 }
1374 
1375 /* how much room is there for writing */
1376 static int hso_serial_write_room(struct tty_struct *tty)
1377 {
1378         struct hso_serial *serial = tty->driver_data;
1379         int room;
1380         unsigned long flags;
1381 
1382         spin_lock_irqsave(&serial->serial_lock, flags);
1383         room = serial->tx_data_length - serial->tx_buffer_count;
1384         spin_unlock_irqrestore(&serial->serial_lock, flags);
1385 
1386         /* return free room */
1387         return room;
1388 }
1389 
1390 static void hso_serial_cleanup(struct tty_struct *tty)
1391 {
1392         struct hso_serial *serial = tty->driver_data;
1393 
1394         if (!serial)
1395                 return;
1396 
1397         kref_put(&serial->parent->ref, hso_serial_ref_free);
1398 }
1399 
1400 /* setup the term */
1401 static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old)
1402 {
1403         struct hso_serial *serial = tty->driver_data;
1404         unsigned long flags;
1405 
1406         if (old)
1407                 hso_dbg(0x16, "Termios called with: cflags new[%d] - old[%d]\n",
1408                         tty->termios.c_cflag, old->c_cflag);
1409 
1410         /* the actual setup */
1411         spin_lock_irqsave(&serial->serial_lock, flags);
1412         if (serial->port.count)
1413                 _hso_serial_set_termios(tty, old);
1414         else
1415                 tty->termios = *old;
1416         spin_unlock_irqrestore(&serial->serial_lock, flags);
1417 
1418         /* done */
1419 }
1420 
1421 /* how many characters in the buffer */
1422 static int hso_serial_chars_in_buffer(struct tty_struct *tty)
1423 {
1424         struct hso_serial *serial = tty->driver_data;
1425         int chars;
1426         unsigned long flags;
1427 
1428         /* sanity check */
1429         if (serial == NULL)
1430                 return 0;
1431 
1432         spin_lock_irqsave(&serial->serial_lock, flags);
1433         chars = serial->tx_buffer_count;
1434         spin_unlock_irqrestore(&serial->serial_lock, flags);
1435 
1436         return chars;
1437 }
1438 static int tiocmget_submit_urb(struct hso_serial *serial,
1439                                struct hso_tiocmget *tiocmget,
1440                                struct usb_device *usb)
1441 {
1442         int result;
1443 
1444         if (serial->parent->usb_gone)
1445                 return -ENODEV;
1446         usb_fill_int_urb(tiocmget->urb, usb,
1447                          usb_rcvintpipe(usb,
1448                                         tiocmget->endp->
1449                                         bEndpointAddress & 0x7F),
1450                          &tiocmget->serial_state_notification,
1451                          sizeof(struct hso_serial_state_notification),
1452                          tiocmget_intr_callback, serial,
1453                          tiocmget->endp->bInterval);
1454         result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
1455         if (result) {
1456                 dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
1457                          result);
1458         }
1459         return result;
1460 
1461 }
1462 
1463 static void tiocmget_intr_callback(struct urb *urb)
1464 {
1465         struct hso_serial *serial = urb->context;
1466         struct hso_tiocmget *tiocmget;
1467         int status = urb->status;
1468         u16 UART_state_bitmap, prev_UART_state_bitmap;
1469         struct uart_icount *icount;
1470         struct hso_serial_state_notification *serial_state_notification;
1471         struct usb_device *usb;
1472         struct usb_interface *interface;
1473         int if_num;
1474 
1475         /* Sanity checks */
1476         if (!serial)
1477                 return;
1478         if (status) {
1479                 handle_usb_error(status, __func__, serial->parent);
1480                 return;
1481         }
1482 
1483         /* tiocmget is only supported on HSO_PORT_MODEM */
1484         tiocmget = serial->tiocmget;
1485         if (!tiocmget)
1486                 return;
1487         BUG_ON((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM);
1488 
1489         usb = serial->parent->usb;
1490         interface = serial->parent->interface;
1491 
1492         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1493 
1494         /* wIndex should be the USB interface number of the port to which the
1495          * notification applies, which should always be the Modem port.
1496          */
1497         serial_state_notification = &tiocmget->serial_state_notification;
1498         if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
1499             serial_state_notification->bNotification != B_NOTIFICATION ||
1500             le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
1501             le16_to_cpu(serial_state_notification->wIndex) != if_num ||
1502             le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
1503                 dev_warn(&usb->dev,
1504                          "hso received invalid serial state notification\n");
1505                 DUMP(serial_state_notification,
1506                      sizeof(struct hso_serial_state_notification));
1507         } else {
1508 
1509                 UART_state_bitmap = le16_to_cpu(serial_state_notification->
1510                                                 UART_state_bitmap);
1511                 prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
1512                 icount = &tiocmget->icount;
1513                 spin_lock(&serial->serial_lock);
1514                 if ((UART_state_bitmap & B_OVERRUN) !=
1515                    (prev_UART_state_bitmap & B_OVERRUN))
1516                         icount->parity++;
1517                 if ((UART_state_bitmap & B_PARITY) !=
1518                    (prev_UART_state_bitmap & B_PARITY))
1519                         icount->parity++;
1520                 if ((UART_state_bitmap & B_FRAMING) !=
1521                    (prev_UART_state_bitmap & B_FRAMING))
1522                         icount->frame++;
1523                 if ((UART_state_bitmap & B_RING_SIGNAL) &&
1524                    !(prev_UART_state_bitmap & B_RING_SIGNAL))
1525                         icount->rng++;
1526                 if ((UART_state_bitmap & B_BREAK) !=
1527                    (prev_UART_state_bitmap & B_BREAK))
1528                         icount->brk++;
1529                 if ((UART_state_bitmap & B_TX_CARRIER) !=
1530                    (prev_UART_state_bitmap & B_TX_CARRIER))
1531                         icount->dsr++;
1532                 if ((UART_state_bitmap & B_RX_CARRIER) !=
1533                    (prev_UART_state_bitmap & B_RX_CARRIER))
1534                         icount->dcd++;
1535                 tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
1536                 spin_unlock(&serial->serial_lock);
1537                 tiocmget->intr_completed = 1;
1538                 wake_up_interruptible(&tiocmget->waitq);
1539         }
1540         memset(serial_state_notification, 0,
1541                sizeof(struct hso_serial_state_notification));
1542         tiocmget_submit_urb(serial,
1543                             tiocmget,
1544                             serial->parent->usb);
1545 }
1546 
1547 /*
1548  * next few functions largely stolen from drivers/serial/serial_core.c
1549  */
1550 /* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1551  * - mask passed in arg for lines of interest
1552  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1553  * Caller should use TIOCGICOUNT to see which one it was
1554  */
1555 static int
1556 hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
1557 {
1558         DECLARE_WAITQUEUE(wait, current);
1559         struct uart_icount cprev, cnow;
1560         struct hso_tiocmget  *tiocmget;
1561         int ret;
1562 
1563         tiocmget = serial->tiocmget;
1564         if (!tiocmget)
1565                 return -ENOENT;
1566         /*
1567          * note the counters on entry
1568          */
1569         spin_lock_irq(&serial->serial_lock);
1570         memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
1571         spin_unlock_irq(&serial->serial_lock);
1572         add_wait_queue(&tiocmget->waitq, &wait);
1573         for (;;) {
1574                 spin_lock_irq(&serial->serial_lock);
1575                 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1576                 spin_unlock_irq(&serial->serial_lock);
1577                 set_current_state(TASK_INTERRUPTIBLE);
1578                 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1579                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1580                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd))) {
1581                         ret = 0;
1582                         break;
1583                 }
1584                 schedule();
1585                 /* see if a signal did it */
1586                 if (signal_pending(current)) {
1587                         ret = -ERESTARTSYS;
1588                         break;
1589                 }
1590                 cprev = cnow;
1591         }
1592         __set_current_state(TASK_RUNNING);
1593         remove_wait_queue(&tiocmget->waitq, &wait);
1594 
1595         return ret;
1596 }
1597 
1598 /*
1599  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1600  * Return: write counters to the user passed counter struct
1601  * NB: both 1->0 and 0->1 transitions are counted except for
1602  *     RI where only 0->1 is counted.
1603  */
1604 static int hso_get_count(struct tty_struct *tty,
1605                   struct serial_icounter_struct *icount)
1606 {
1607         struct uart_icount cnow;
1608         struct hso_serial *serial = tty->driver_data;
1609         struct hso_tiocmget  *tiocmget = serial->tiocmget;
1610 
1611         memset(icount, 0, sizeof(struct serial_icounter_struct));
1612 
1613         if (!tiocmget)
1614                  return -ENOENT;
1615         spin_lock_irq(&serial->serial_lock);
1616         memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1617         spin_unlock_irq(&serial->serial_lock);
1618 
1619         icount->cts         = cnow.cts;
1620         icount->dsr         = cnow.dsr;
1621         icount->rng         = cnow.rng;
1622         icount->dcd         = cnow.dcd;
1623         icount->rx          = cnow.rx;
1624         icount->tx          = cnow.tx;
1625         icount->frame       = cnow.frame;
1626         icount->overrun     = cnow.overrun;
1627         icount->parity      = cnow.parity;
1628         icount->brk         = cnow.brk;
1629         icount->buf_overrun = cnow.buf_overrun;
1630 
1631         return 0;
1632 }
1633 
1634 
1635 static int hso_serial_tiocmget(struct tty_struct *tty)
1636 {
1637         int retval;
1638         struct hso_serial *serial = tty->driver_data;
1639         struct hso_tiocmget  *tiocmget;
1640         u16 UART_state_bitmap;
1641 
1642         /* sanity check */
1643         if (!serial) {
1644                 hso_dbg(0x1, "no tty structures\n");
1645                 return -EINVAL;
1646         }
1647         spin_lock_irq(&serial->serial_lock);
1648         retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
1649             ((serial->dtr_state) ? TIOCM_DTR : 0);
1650         tiocmget = serial->tiocmget;
1651         if (tiocmget) {
1652 
1653                 UART_state_bitmap = le16_to_cpu(
1654                         tiocmget->prev_UART_state_bitmap);
1655                 if (UART_state_bitmap & B_RING_SIGNAL)
1656                         retval |=  TIOCM_RNG;
1657                 if (UART_state_bitmap & B_RX_CARRIER)
1658                         retval |=  TIOCM_CD;
1659                 if (UART_state_bitmap & B_TX_CARRIER)
1660                         retval |=  TIOCM_DSR;
1661         }
1662         spin_unlock_irq(&serial->serial_lock);
1663         return retval;
1664 }
1665 
1666 static int hso_serial_tiocmset(struct tty_struct *tty,
1667                                unsigned int set, unsigned int clear)
1668 {
1669         int val = 0;
1670         unsigned long flags;
1671         int if_num;
1672         struct hso_serial *serial = tty->driver_data;
1673         struct usb_interface *interface;
1674 
1675         /* sanity check */
1676         if (!serial) {
1677                 hso_dbg(0x1, "no tty structures\n");
1678                 return -EINVAL;
1679         }
1680 
1681         if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
1682                 return -EINVAL;
1683 
1684         interface = serial->parent->interface;
1685         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1686 
1687         spin_lock_irqsave(&serial->serial_lock, flags);
1688         if (set & TIOCM_RTS)
1689                 serial->rts_state = 1;
1690         if (set & TIOCM_DTR)
1691                 serial->dtr_state = 1;
1692 
1693         if (clear & TIOCM_RTS)
1694                 serial->rts_state = 0;
1695         if (clear & TIOCM_DTR)
1696                 serial->dtr_state = 0;
1697 
1698         if (serial->dtr_state)
1699                 val |= 0x01;
1700         if (serial->rts_state)
1701                 val |= 0x02;
1702 
1703         spin_unlock_irqrestore(&serial->serial_lock, flags);
1704 
1705         return usb_control_msg(serial->parent->usb,
1706                                usb_rcvctrlpipe(serial->parent->usb, 0), 0x22,
1707                                0x21, val, if_num, NULL, 0,
1708                                USB_CTRL_SET_TIMEOUT);
1709 }
1710 
1711 static int hso_serial_ioctl(struct tty_struct *tty,
1712                             unsigned int cmd, unsigned long arg)
1713 {
1714         struct hso_serial *serial = tty->driver_data;
1715         int ret = 0;
1716         hso_dbg(0x8, "IOCTL cmd: %d, arg: %ld\n", cmd, arg);
1717 
1718         if (!serial)
1719                 return -ENODEV;
1720         switch (cmd) {
1721         case TIOCMIWAIT:
1722                 ret = hso_wait_modem_status(serial, arg);
1723                 break;
1724         default:
1725                 ret = -ENOIOCTLCMD;
1726                 break;
1727         }
1728         return ret;
1729 }
1730 
1731 
1732 /* starts a transmit */
1733 static void hso_kick_transmit(struct hso_serial *serial)
1734 {
1735         u8 *temp;
1736         unsigned long flags;
1737         int res;
1738 
1739         spin_lock_irqsave(&serial->serial_lock, flags);
1740         if (!serial->tx_buffer_count)
1741                 goto out;
1742 
1743         if (serial->tx_urb_used)
1744                 goto out;
1745 
1746         /* Wakeup USB interface if necessary */
1747         if (hso_get_activity(serial->parent) == -EAGAIN)
1748                 goto out;
1749 
1750         /* Switch pointers around to avoid memcpy */
1751         temp = serial->tx_buffer;
1752         serial->tx_buffer = serial->tx_data;
1753         serial->tx_data = temp;
1754         serial->tx_data_count = serial->tx_buffer_count;
1755         serial->tx_buffer_count = 0;
1756 
1757         /* If temp is set, it means we switched buffers */
1758         if (temp && serial->write_data) {
1759                 res = serial->write_data(serial);
1760                 if (res >= 0)
1761                         serial->tx_urb_used = 1;
1762         }
1763 out:
1764         spin_unlock_irqrestore(&serial->serial_lock, flags);
1765 }
1766 
1767 /* make a request (for reading and writing data to muxed serial port) */
1768 static int mux_device_request(struct hso_serial *serial, u8 type, u16 port,
1769                               struct urb *ctrl_urb,
1770                               struct usb_ctrlrequest *ctrl_req,
1771                               u8 *ctrl_urb_data, u32 size)
1772 {
1773         int result;
1774         int pipe;
1775 
1776         /* Sanity check */
1777         if (!serial || !ctrl_urb || !ctrl_req) {
1778                 pr_err("%s: Wrong arguments\n", __func__);
1779                 return -EINVAL;
1780         }
1781 
1782         /* initialize */
1783         ctrl_req->wValue = 0;
1784         ctrl_req->wIndex = cpu_to_le16(hso_port_to_mux(port));
1785         ctrl_req->wLength = cpu_to_le16(size);
1786 
1787         if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) {
1788                 /* Reading command */
1789                 ctrl_req->bRequestType = USB_DIR_IN |
1790                                          USB_TYPE_OPTION_VENDOR |
1791                                          USB_RECIP_INTERFACE;
1792                 ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
1793                 pipe = usb_rcvctrlpipe(serial->parent->usb, 0);
1794         } else {
1795                 /* Writing command */
1796                 ctrl_req->bRequestType = USB_DIR_OUT |
1797                                          USB_TYPE_OPTION_VENDOR |
1798                                          USB_RECIP_INTERFACE;
1799                 ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
1800                 pipe = usb_sndctrlpipe(serial->parent->usb, 0);
1801         }
1802         /* syslog */
1803         hso_dbg(0x2, "%s command (%02x) len: %d, port: %d\n",
1804                 type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write",
1805                 ctrl_req->bRequestType, ctrl_req->wLength, port);
1806 
1807         /* Load ctrl urb */
1808         ctrl_urb->transfer_flags = 0;
1809         usb_fill_control_urb(ctrl_urb,
1810                              serial->parent->usb,
1811                              pipe,
1812                              (u8 *) ctrl_req,
1813                              ctrl_urb_data, size, ctrl_callback, serial);
1814         /* Send it on merry way */
1815         result = usb_submit_urb(ctrl_urb, GFP_ATOMIC);
1816         if (result) {
1817                 dev_err(&ctrl_urb->dev->dev,
1818                         "%s failed submit ctrl_urb %d type %d\n", __func__,
1819                         result, type);
1820                 return result;
1821         }
1822 
1823         /* done */
1824         return size;
1825 }
1826 
1827 /* called by intr_callback when read occurs */
1828 static int hso_mux_serial_read(struct hso_serial *serial)
1829 {
1830         if (!serial)
1831                 return -EINVAL;
1832 
1833         /* clean data */
1834         memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE);
1835         /* make the request */
1836 
1837         if (serial->num_rx_urbs != 1) {
1838                 dev_err(&serial->parent->interface->dev,
1839                         "ERROR: mux'd reads with multiple buffers "
1840                         "not possible\n");
1841                 return 0;
1842         }
1843         return mux_device_request(serial,
1844                                   USB_CDC_GET_ENCAPSULATED_RESPONSE,
1845                                   serial->parent->port_spec & HSO_PORT_MASK,
1846                                   serial->rx_urb[0],
1847                                   &serial->ctrl_req_rx,
1848                                   serial->rx_data[0], serial->rx_data_length);
1849 }
1850 
1851 /* used for muxed serial port callback (muxed serial read) */
1852 static void intr_callback(struct urb *urb)
1853 {
1854         struct hso_shared_int *shared_int = urb->context;
1855         struct hso_serial *serial;
1856         unsigned char *port_req;
1857         int status = urb->status;
1858         int i;
1859 
1860         usb_mark_last_busy(urb->dev);
1861 
1862         /* sanity check */
1863         if (!shared_int)
1864                 return;
1865 
1866         /* status check */
1867         if (status) {
1868                 handle_usb_error(status, __func__, NULL);
1869                 return;
1870         }
1871         hso_dbg(0x8, "--- Got intr callback 0x%02X ---\n", status);
1872 
1873         /* what request? */
1874         port_req = urb->transfer_buffer;
1875         hso_dbg(0x8, "port_req = 0x%.2X\n", *port_req);
1876         /* loop over all muxed ports to find the one sending this */
1877         for (i = 0; i < 8; i++) {
1878                 /* max 8 channels on MUX */
1879                 if (*port_req & (1 << i)) {
1880                         serial = get_serial_by_shared_int_and_type(shared_int,
1881                                                                    (1 << i));
1882                         if (serial != NULL) {
1883                                 hso_dbg(0x1, "Pending read interrupt on port %d\n",
1884                                         i);
1885                                 spin_lock(&serial->serial_lock);
1886                                 if (serial->rx_state == RX_IDLE &&
1887                                         serial->port.count > 0) {
1888                                         /* Setup and send a ctrl req read on
1889                                          * port i */
1890                                         if (!serial->rx_urb_filled[0]) {
1891                                                 serial->rx_state = RX_SENT;
1892                                                 hso_mux_serial_read(serial);
1893                                         } else
1894                                                 serial->rx_state = RX_PENDING;
1895                                 } else {
1896                                         hso_dbg(0x1, "Already a read pending on port %d or port not open\n",
1897                                                 i);
1898                                 }
1899                                 spin_unlock(&serial->serial_lock);
1900                         }
1901                 }
1902         }
1903         /* Resubmit interrupt urb */
1904         hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC);
1905 }
1906 
1907 /* called for writing to muxed serial port */
1908 static int hso_mux_serial_write_data(struct hso_serial *serial)
1909 {
1910         if (NULL == serial)
1911                 return -EINVAL;
1912 
1913         return mux_device_request(serial,
1914                                   USB_CDC_SEND_ENCAPSULATED_COMMAND,
1915                                   serial->parent->port_spec & HSO_PORT_MASK,
1916                                   serial->tx_urb,
1917                                   &serial->ctrl_req_tx,
1918                                   serial->tx_data, serial->tx_data_count);
1919 }
1920 
1921 /* write callback for Diag and CS port */
1922 static void hso_std_serial_write_bulk_callback(struct urb *urb)
1923 {
1924         struct hso_serial *serial = urb->context;
1925         int status = urb->status;
1926 
1927         /* sanity check */
1928         if (!serial) {
1929                 hso_dbg(0x1, "serial == NULL\n");
1930                 return;
1931         }
1932 
1933         spin_lock(&serial->serial_lock);
1934         serial->tx_urb_used = 0;
1935         spin_unlock(&serial->serial_lock);
1936         if (status) {
1937                 handle_usb_error(status, __func__, serial->parent);
1938                 return;
1939         }
1940         hso_put_activity(serial->parent);
1941         tty_port_tty_wakeup(&serial->port);
1942         hso_kick_transmit(serial);
1943 
1944         hso_dbg(0x1, "\n");
1945 }
1946 
1947 /* called for writing diag or CS serial port */
1948 static int hso_std_serial_write_data(struct hso_serial *serial)
1949 {
1950         int count = serial->tx_data_count;
1951         int result;
1952 
1953         usb_fill_bulk_urb(serial->tx_urb,
1954                           serial->parent->usb,
1955                           usb_sndbulkpipe(serial->parent->usb,
1956                                           serial->out_endp->
1957                                           bEndpointAddress & 0x7F),
1958                           serial->tx_data, serial->tx_data_count,
1959                           hso_std_serial_write_bulk_callback, serial);
1960 
1961         result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC);
1962         if (result) {
1963                 dev_warn(&serial->parent->usb->dev,
1964                          "Failed to submit urb - res %d\n", result);
1965                 return result;
1966         }
1967 
1968         return count;
1969 }
1970 
1971 /* callback after read or write on muxed serial port */
1972 static void ctrl_callback(struct urb *urb)
1973 {
1974         struct hso_serial *serial = urb->context;
1975         struct usb_ctrlrequest *req;
1976         int status = urb->status;
1977 
1978         /* sanity check */
1979         if (!serial)
1980                 return;
1981 
1982         spin_lock(&serial->serial_lock);
1983         serial->tx_urb_used = 0;
1984         spin_unlock(&serial->serial_lock);
1985         if (status) {
1986                 handle_usb_error(status, __func__, serial->parent);
1987                 return;
1988         }
1989 
1990         /* what request? */
1991         req = (struct usb_ctrlrequest *)(urb->setup_packet);
1992         hso_dbg(0x8, "--- Got muxed ctrl callback 0x%02X ---\n", status);
1993         hso_dbg(0x8, "Actual length of urb = %d\n", urb->actual_length);
1994         DUMP1(urb->transfer_buffer, urb->actual_length);
1995 
1996         if (req->bRequestType ==
1997             (USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) {
1998                 /* response to a read command */
1999                 serial->rx_urb_filled[0] = 1;
2000                 spin_lock(&serial->serial_lock);
2001                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
2002                 spin_unlock(&serial->serial_lock);
2003         } else {
2004                 hso_put_activity(serial->parent);
2005                 tty_port_tty_wakeup(&serial->port);
2006                 /* response to a write command */
2007                 hso_kick_transmit(serial);
2008         }
2009 }
2010 
2011 /* handle RX data for serial port */
2012 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
2013 {
2014         struct tty_struct *tty;
2015         int count;
2016 
2017         /* Sanity check */
2018         if (urb == NULL || serial == NULL) {
2019                 hso_dbg(0x1, "serial = NULL\n");
2020                 return -2;
2021         }
2022 
2023         tty = tty_port_tty_get(&serial->port);
2024 
2025         if (tty && tty_throttled(tty)) {
2026                 tty_kref_put(tty);
2027                 return -1;
2028         }
2029 
2030         /* Push data to tty */
2031         hso_dbg(0x1, "data to push to tty\n");
2032         count = tty_buffer_request_room(&serial->port, urb->actual_length);
2033         if (count >= urb->actual_length) {
2034                 tty_insert_flip_string(&serial->port, urb->transfer_buffer,
2035                                        urb->actual_length);
2036                 tty_flip_buffer_push(&serial->port);
2037         } else {
2038                 dev_warn(&serial->parent->usb->dev,
2039                          "dropping data, %d bytes lost\n", urb->actual_length);
2040         }
2041 
2042         tty_kref_put(tty);
2043 
2044         serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
2045 
2046         return 0;
2047 }
2048 
2049 
2050 /* Base driver functions */
2051 
2052 static void hso_log_port(struct hso_device *hso_dev)
2053 {
2054         char *port_type;
2055         char port_dev[20];
2056 
2057         switch (hso_dev->port_spec & HSO_PORT_MASK) {
2058         case HSO_PORT_CONTROL:
2059                 port_type = "Control";
2060                 break;
2061         case HSO_PORT_APP:
2062                 port_type = "Application";
2063                 break;
2064         case HSO_PORT_GPS:
2065                 port_type = "GPS";
2066                 break;
2067         case HSO_PORT_GPS_CONTROL:
2068                 port_type = "GPS control";
2069                 break;
2070         case HSO_PORT_APP2:
2071                 port_type = "Application2";
2072                 break;
2073         case HSO_PORT_PCSC:
2074                 port_type = "PCSC";
2075                 break;
2076         case HSO_PORT_DIAG:
2077                 port_type = "Diagnostic";
2078                 break;
2079         case HSO_PORT_DIAG2:
2080                 port_type = "Diagnostic2";
2081                 break;
2082         case HSO_PORT_MODEM:
2083                 port_type = "Modem";
2084                 break;
2085         case HSO_PORT_NETWORK:
2086                 port_type = "Network";
2087                 break;
2088         default:
2089                 port_type = "Unknown";
2090                 break;
2091         }
2092         if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2093                 sprintf(port_dev, "%s", dev2net(hso_dev)->net->name);
2094         } else
2095                 sprintf(port_dev, "/dev/%s%d", tty_filename,
2096                         dev2ser(hso_dev)->minor);
2097 
2098         dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n",
2099                 port_type, port_dev);
2100 }
2101 
2102 static int hso_start_net_device(struct hso_device *hso_dev)
2103 {
2104         int i, result = 0;
2105         struct hso_net *hso_net = dev2net(hso_dev);
2106 
2107         if (!hso_net)
2108                 return -ENODEV;
2109 
2110         /* send URBs for all read buffers */
2111         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2112 
2113                 /* Prep a receive URB */
2114                 usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i],
2115                                   hso_dev->usb,
2116                                   usb_rcvbulkpipe(hso_dev->usb,
2117                                                   hso_net->in_endp->
2118                                                   bEndpointAddress & 0x7F),
2119                                   hso_net->mux_bulk_rx_buf_pool[i],
2120                                   MUX_BULK_RX_BUF_SIZE, read_bulk_callback,
2121                                   hso_net);
2122 
2123                 /* Put it out there so the device can send us stuff */
2124                 result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i],
2125                                         GFP_NOIO);
2126                 if (result)
2127                         dev_warn(&hso_dev->usb->dev,
2128                                 "%s failed mux_bulk_rx_urb[%d] %d\n", __func__,
2129                                 i, result);
2130         }
2131 
2132         return result;
2133 }
2134 
2135 static int hso_stop_net_device(struct hso_device *hso_dev)
2136 {
2137         int i;
2138         struct hso_net *hso_net = dev2net(hso_dev);
2139 
2140         if (!hso_net)
2141                 return -ENODEV;
2142 
2143         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2144                 if (hso_net->mux_bulk_rx_urb_pool[i])
2145                         usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2146 
2147         }
2148         if (hso_net->mux_bulk_tx_urb)
2149                 usb_kill_urb(hso_net->mux_bulk_tx_urb);
2150 
2151         return 0;
2152 }
2153 
2154 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
2155 {
2156         int i, result = 0;
2157         struct hso_serial *serial = dev2ser(hso_dev);
2158 
2159         if (!serial)
2160                 return -ENODEV;
2161 
2162         /* If it is not the MUX port fill in and submit a bulk urb (already
2163          * allocated in hso_serial_start) */
2164         if (!(serial->parent->port_spec & HSO_INTF_MUX)) {
2165                 for (i = 0; i < serial->num_rx_urbs; i++) {
2166                         usb_fill_bulk_urb(serial->rx_urb[i],
2167                                           serial->parent->usb,
2168                                           usb_rcvbulkpipe(serial->parent->usb,
2169                                                           serial->in_endp->
2170                                                           bEndpointAddress &
2171                                                           0x7F),
2172                                           serial->rx_data[i],
2173                                           serial->rx_data_length,
2174                                           hso_std_serial_read_bulk_callback,
2175                                           serial);
2176                         result = usb_submit_urb(serial->rx_urb[i], flags);
2177                         if (result) {
2178                                 dev_warn(&serial->parent->usb->dev,
2179                                          "Failed to submit urb - res %d\n",
2180                                          result);
2181                                 break;
2182                         }
2183                 }
2184         } else {
2185                 mutex_lock(&serial->shared_int->shared_int_lock);
2186                 if (!serial->shared_int->use_count) {
2187                         result =
2188                             hso_mux_submit_intr_urb(serial->shared_int,
2189                                                     hso_dev->usb, flags);
2190                 }
2191                 serial->shared_int->use_count++;
2192                 mutex_unlock(&serial->shared_int->shared_int_lock);
2193         }
2194         if (serial->tiocmget)
2195                 tiocmget_submit_urb(serial,
2196                                     serial->tiocmget,
2197                                     serial->parent->usb);
2198         return result;
2199 }
2200 
2201 static int hso_stop_serial_device(struct hso_device *hso_dev)
2202 {
2203         int i;
2204         struct hso_serial *serial = dev2ser(hso_dev);
2205         struct hso_tiocmget  *tiocmget;
2206 
2207         if (!serial)
2208                 return -ENODEV;
2209 
2210         for (i = 0; i < serial->num_rx_urbs; i++) {
2211                 if (serial->rx_urb[i]) {
2212                         usb_kill_urb(serial->rx_urb[i]);
2213                         serial->rx_urb_filled[i] = 0;
2214                 }
2215         }
2216         serial->curr_rx_urb_idx = 0;
2217 
2218         if (serial->tx_urb)
2219                 usb_kill_urb(serial->tx_urb);
2220 
2221         if (serial->shared_int) {
2222                 mutex_lock(&serial->shared_int->shared_int_lock);
2223                 if (serial->shared_int->use_count &&
2224                     (--serial->shared_int->use_count == 0)) {
2225                         struct urb *urb;
2226 
2227                         urb = serial->shared_int->shared_intr_urb;
2228                         if (urb)
2229                                 usb_kill_urb(urb);
2230                 }
2231                 mutex_unlock(&serial->shared_int->shared_int_lock);
2232         }
2233         tiocmget = serial->tiocmget;
2234         if (tiocmget) {
2235                 wake_up_interruptible(&tiocmget->waitq);
2236                 usb_kill_urb(tiocmget->urb);
2237         }
2238 
2239         return 0;
2240 }
2241 
2242 static void hso_serial_tty_unregister(struct hso_serial *serial)
2243 {
2244         tty_unregister_device(tty_drv, serial->minor);
2245 }
2246 
2247 static void hso_serial_common_free(struct hso_serial *serial)
2248 {
2249         int i;
2250 
2251         for (i = 0; i < serial->num_rx_urbs; i++) {
2252                 /* unlink and free RX URB */
2253                 usb_free_urb(serial->rx_urb[i]);
2254                 /* free the RX buffer */
2255                 kfree(serial->rx_data[i]);
2256         }
2257 
2258         /* unlink and free TX URB */
2259         usb_free_urb(serial->tx_urb);
2260         kfree(serial->tx_buffer);
2261         kfree(serial->tx_data);
2262         tty_port_destroy(&serial->port);
2263 }
2264 
2265 static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
2266                                     int rx_size, int tx_size)
2267 {
2268         struct device *dev;
2269         int minor;
2270         int i;
2271 
2272         tty_port_init(&serial->port);
2273 
2274         minor = get_free_serial_index();
2275         if (minor < 0)
2276                 goto exit;
2277 
2278         /* register our minor number */
2279         serial->parent->dev = tty_port_register_device_attr(&serial->port,
2280                         tty_drv, minor, &serial->parent->interface->dev,
2281                         serial->parent, hso_serial_dev_groups);
2282         dev = serial->parent->dev;
2283 
2284         /* fill in specific data for later use */
2285         serial->minor = minor;
2286         serial->magic = HSO_SERIAL_MAGIC;
2287         spin_lock_init(&serial->serial_lock);
2288         serial->num_rx_urbs = num_urbs;
2289 
2290         /* RX, allocate urb and initialize */
2291 
2292         /* prepare our RX buffer */
2293         serial->rx_data_length = rx_size;
2294         for (i = 0; i < serial->num_rx_urbs; i++) {
2295                 serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
2296                 if (!serial->rx_urb[i])
2297                         goto exit;
2298                 serial->rx_urb[i]->transfer_buffer = NULL;
2299                 serial->rx_urb[i]->transfer_buffer_length = 0;
2300                 serial->rx_data[i] = kzalloc(serial->rx_data_length,
2301                                              GFP_KERNEL);
2302                 if (!serial->rx_data[i])
2303                         goto exit;
2304         }
2305 
2306         /* TX, allocate urb and initialize */
2307         serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2308         if (!serial->tx_urb)
2309                 goto exit;
2310         serial->tx_urb->transfer_buffer = NULL;
2311         serial->tx_urb->transfer_buffer_length = 0;
2312         /* prepare our TX buffer */
2313         serial->tx_data_count = 0;
2314         serial->tx_buffer_count = 0;
2315         serial->tx_data_length = tx_size;
2316         serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL);
2317         if (!serial->tx_data)
2318                 goto exit;
2319 
2320         serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL);
2321         if (!serial->tx_buffer)
2322                 goto exit;
2323 
2324         return 0;
2325 exit:
2326         hso_serial_tty_unregister(serial);
2327         hso_serial_common_free(serial);
2328         return -1;
2329 }
2330 
2331 /* Creates a general hso device */
2332 static struct hso_device *hso_create_device(struct usb_interface *intf,
2333                                             int port_spec)
2334 {
2335         struct hso_device *hso_dev;
2336 
2337         hso_dev = kzalloc(sizeof(*hso_dev), GFP_ATOMIC);
2338         if (!hso_dev)
2339                 return NULL;
2340 
2341         hso_dev->port_spec = port_spec;
2342         hso_dev->usb = interface_to_usbdev(intf);
2343         hso_dev->interface = intf;
2344         kref_init(&hso_dev->ref);
2345         mutex_init(&hso_dev->mutex);
2346 
2347         INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
2348         INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
2349 
2350         return hso_dev;
2351 }
2352 
2353 /* Removes a network device in the network device table */
2354 static int remove_net_device(struct hso_device *hso_dev)
2355 {
2356         int i;
2357 
2358         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2359                 if (network_table[i] == hso_dev) {
2360                         network_table[i] = NULL;
2361                         break;
2362                 }
2363         }
2364         if (i == HSO_MAX_NET_DEVICES)
2365                 return -1;
2366         return 0;
2367 }
2368 
2369 /* Frees our network device */
2370 static void hso_free_net_device(struct hso_device *hso_dev)
2371 {
2372         int i;
2373         struct hso_net *hso_net = dev2net(hso_dev);
2374 
2375         if (!hso_net)
2376                 return;
2377 
2378         remove_net_device(hso_net->parent);
2379 
2380         if (hso_net->net)
2381                 unregister_netdev(hso_net->net);
2382 
2383         /* start freeing */
2384         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2385                 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2386                 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2387                 hso_net->mux_bulk_rx_buf_pool[i] = NULL;
2388         }
2389         usb_free_urb(hso_net->mux_bulk_tx_urb);
2390         kfree(hso_net->mux_bulk_tx_buf);
2391         hso_net->mux_bulk_tx_buf = NULL;
2392 
2393         if (hso_net->net)
2394                 free_netdev(hso_net->net);
2395 
2396         kfree(hso_dev);
2397 }
2398 
2399 static const struct net_device_ops hso_netdev_ops = {
2400         .ndo_open       = hso_net_open,
2401         .ndo_stop       = hso_net_close,
2402         .ndo_start_xmit = hso_net_start_xmit,
2403         .ndo_tx_timeout = hso_net_tx_timeout,
2404 };
2405 
2406 /* initialize the network interface */
2407 static void hso_net_init(struct net_device *net)
2408 {
2409         struct hso_net *hso_net = netdev_priv(net);
2410 
2411         hso_dbg(0x1, "sizeof hso_net is %zu\n", sizeof(*hso_net));
2412 
2413         /* fill in the other fields */
2414         net->netdev_ops = &hso_netdev_ops;
2415         net->watchdog_timeo = HSO_NET_TX_TIMEOUT;
2416         net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2417         net->type = ARPHRD_NONE;
2418         net->mtu = DEFAULT_MTU - 14;
2419         net->tx_queue_len = 10;
2420         net->ethtool_ops = &ops;
2421 
2422         /* and initialize the semaphore */
2423         spin_lock_init(&hso_net->net_lock);
2424 }
2425 
2426 /* Adds a network device in the network device table */
2427 static int add_net_device(struct hso_device *hso_dev)
2428 {
2429         int i;
2430 
2431         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2432                 if (network_table[i] == NULL) {
2433                         network_table[i] = hso_dev;
2434                         break;
2435                 }
2436         }
2437         if (i == HSO_MAX_NET_DEVICES)
2438                 return -1;
2439         return 0;
2440 }
2441 
2442 static int hso_rfkill_set_block(void *data, bool blocked)
2443 {
2444         struct hso_device *hso_dev = data;
2445         int enabled = !blocked;
2446         int rv;
2447 
2448         mutex_lock(&hso_dev->mutex);
2449         if (hso_dev->usb_gone)
2450                 rv = 0;
2451         else
2452                 rv = usb_control_msg(hso_dev->usb, usb_rcvctrlpipe(hso_dev->usb, 0),
2453                                        enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
2454                                        USB_CTRL_SET_TIMEOUT);
2455         mutex_unlock(&hso_dev->mutex);
2456         return rv;
2457 }
2458 
2459 static const struct rfkill_ops hso_rfkill_ops = {
2460         .set_block = hso_rfkill_set_block,
2461 };
2462 
2463 /* Creates and sets up everything for rfkill */
2464 static void hso_create_rfkill(struct hso_device *hso_dev,
2465                              struct usb_interface *interface)
2466 {
2467         struct hso_net *hso_net = dev2net(hso_dev);
2468         struct device *dev = &hso_net->net->dev;
2469         static u32 rfkill_counter;
2470 
2471         snprintf(hso_net->name, sizeof(hso_net->name), "hso-%d",
2472                  rfkill_counter++);
2473 
2474         hso_net->rfkill = rfkill_alloc(hso_net->name,
2475                                        &interface_to_usbdev(interface)->dev,
2476                                        RFKILL_TYPE_WWAN,
2477                                        &hso_rfkill_ops, hso_dev);
2478         if (!hso_net->rfkill) {
2479                 dev_err(dev, "%s - Out of memory\n", __func__);
2480                 return;
2481         }
2482         if (rfkill_register(hso_net->rfkill) < 0) {
2483                 rfkill_destroy(hso_net->rfkill);
2484                 hso_net->rfkill = NULL;
2485                 dev_err(dev, "%s - Failed to register rfkill\n", __func__);
2486                 return;
2487         }
2488 }
2489 
2490 static struct device_type hso_type = {
2491         .name   = "wwan",
2492 };
2493 
2494 /* Creates our network device */
2495 static struct hso_device *hso_create_net_device(struct usb_interface *interface,
2496                                                 int port_spec)
2497 {
2498         int result, i;
2499         struct net_device *net;
2500         struct hso_net *hso_net;
2501         struct hso_device *hso_dev;
2502 
2503         hso_dev = hso_create_device(interface, port_spec);
2504         if (!hso_dev)
2505                 return NULL;
2506 
2507         /* allocate our network device, then we can put in our private data */
2508         /* call hso_net_init to do the basic initialization */
2509         net = alloc_netdev(sizeof(struct hso_net), "hso%d", NET_NAME_UNKNOWN,
2510                            hso_net_init);
2511         if (!net) {
2512                 dev_err(&interface->dev, "Unable to create ethernet device\n");
2513                 goto exit;
2514         }
2515 
2516         hso_net = netdev_priv(net);
2517 
2518         hso_dev->port_data.dev_net = hso_net;
2519         hso_net->net = net;
2520         hso_net->parent = hso_dev;
2521 
2522         hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2523                                       USB_DIR_IN);
2524         if (!hso_net->in_endp) {
2525                 dev_err(&interface->dev, "Can't find BULK IN endpoint\n");
2526                 goto exit;
2527         }
2528         hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2529                                        USB_DIR_OUT);
2530         if (!hso_net->out_endp) {
2531                 dev_err(&interface->dev, "Can't find BULK OUT endpoint\n");
2532                 goto exit;
2533         }
2534         SET_NETDEV_DEV(net, &interface->dev);
2535         SET_NETDEV_DEVTYPE(net, &hso_type);
2536 
2537         /* registering our net device */
2538         result = register_netdev(net);
2539         if (result) {
2540                 dev_err(&interface->dev, "Failed to register device\n");
2541                 goto exit;
2542         }
2543 
2544         /* start allocating */
2545         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2546                 hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
2547                 if (!hso_net->mux_bulk_rx_urb_pool[i])
2548                         goto exit;
2549                 hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE,
2550                                                            GFP_KERNEL);
2551                 if (!hso_net->mux_bulk_rx_buf_pool[i])
2552                         goto exit;
2553         }
2554         hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2555         if (!hso_net->mux_bulk_tx_urb)
2556                 goto exit;
2557         hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL);
2558         if (!hso_net->mux_bulk_tx_buf)
2559                 goto exit;
2560 
2561         add_net_device(hso_dev);
2562 
2563         hso_log_port(hso_dev);
2564 
2565         hso_create_rfkill(hso_dev, interface);
2566 
2567         return hso_dev;
2568 exit:
2569         hso_free_net_device(hso_dev);
2570         return NULL;
2571 }
2572 
2573 static void hso_free_tiomget(struct hso_serial *serial)
2574 {
2575         struct hso_tiocmget *tiocmget;
2576         if (!serial)
2577                 return;
2578         tiocmget = serial->tiocmget;
2579         if (tiocmget) {
2580                 usb_free_urb(tiocmget->urb);
2581                 tiocmget->urb = NULL;
2582                 serial->tiocmget = NULL;
2583                 kfree(tiocmget);
2584         }
2585 }
2586 
2587 /* Frees an AT channel ( goes for both mux and non-mux ) */
2588 static void hso_free_serial_device(struct hso_device *hso_dev)
2589 {
2590         struct hso_serial *serial = dev2ser(hso_dev);
2591 
2592         if (!serial)
2593                 return;
2594 
2595         hso_serial_common_free(serial);
2596 
2597         if (serial->shared_int) {
2598                 mutex_lock(&serial->shared_int->shared_int_lock);
2599                 if (--serial->shared_int->ref_count == 0)
2600                         hso_free_shared_int(serial->shared_int);
2601                 else
2602                         mutex_unlock(&serial->shared_int->shared_int_lock);
2603         }
2604         hso_free_tiomget(serial);
2605         kfree(serial);
2606         kfree(hso_dev);
2607 }
2608 
2609 /* Creates a bulk AT channel */
2610 static struct hso_device *hso_create_bulk_serial_device(
2611                         struct usb_interface *interface, int port)
2612 {
2613         struct hso_device *hso_dev;
2614         struct hso_serial *serial;
2615         int num_urbs;
2616         struct hso_tiocmget *tiocmget;
2617 
2618         hso_dev = hso_create_device(interface, port);
2619         if (!hso_dev)
2620                 return NULL;
2621 
2622         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2623         if (!serial)
2624                 goto exit;
2625 
2626         serial->parent = hso_dev;
2627         hso_dev->port_data.dev_serial = serial;
2628 
2629         if ((port & HSO_PORT_MASK) == HSO_PORT_MODEM) {
2630                 num_urbs = 2;
2631                 serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
2632                                            GFP_KERNEL);
2633                 /* it isn't going to break our heart if serial->tiocmget
2634                  *  allocation fails don't bother checking this.
2635                  */
2636                 if (serial->tiocmget) {
2637                         tiocmget = serial->tiocmget;
2638                         tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
2639                         if (tiocmget->urb) {
2640                                 mutex_init(&tiocmget->mutex);
2641                                 init_waitqueue_head(&tiocmget->waitq);
2642                                 tiocmget->endp = hso_get_ep(
2643                                         interface,
2644                                         USB_ENDPOINT_XFER_INT,
2645                                         USB_DIR_IN);
2646                         } else
2647                                 hso_free_tiomget(serial);
2648                 }
2649         }
2650         else
2651                 num_urbs = 1;
2652 
2653         if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
2654                                      BULK_URB_TX_SIZE))
2655                 goto exit;
2656 
2657         serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2658                                      USB_DIR_IN);
2659         if (!serial->in_endp) {
2660                 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2661                 goto exit2;
2662         }
2663 
2664         if (!
2665             (serial->out_endp =
2666              hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
2667                 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2668                 goto exit2;
2669         }
2670 
2671         serial->write_data = hso_std_serial_write_data;
2672 
2673         /* and record this serial */
2674         set_serial_by_index(serial->minor, serial);
2675 
2676         /* setup the proc dirs and files if needed */
2677         hso_log_port(hso_dev);
2678 
2679         /* done, return it */
2680         return hso_dev;
2681 
2682 exit2:
2683         hso_serial_tty_unregister(serial);
2684         hso_serial_common_free(serial);
2685 exit:
2686         hso_free_tiomget(serial);
2687         kfree(serial);
2688         kfree(hso_dev);
2689         return NULL;
2690 }
2691 
2692 /* Creates a multiplexed AT channel */
2693 static
2694 struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
2695                                                 int port,
2696                                                 struct hso_shared_int *mux)
2697 {
2698         struct hso_device *hso_dev;
2699         struct hso_serial *serial;
2700         int port_spec;
2701 
2702         port_spec = HSO_INTF_MUX;
2703         port_spec &= ~HSO_PORT_MASK;
2704 
2705         port_spec |= hso_mux_to_port(port);
2706         if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT)
2707                 return NULL;
2708 
2709         hso_dev = hso_create_device(interface, port_spec);
2710         if (!hso_dev)
2711                 return NULL;
2712 
2713         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2714         if (!serial)
2715                 goto exit;
2716 
2717         hso_dev->port_data.dev_serial = serial;
2718         serial->parent = hso_dev;
2719 
2720         if (hso_serial_common_create
2721             (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
2722                 goto exit;
2723 
2724         serial->tx_data_length--;
2725         serial->write_data = hso_mux_serial_write_data;
2726 
2727         serial->shared_int = mux;
2728         mutex_lock(&serial->shared_int->shared_int_lock);
2729         serial->shared_int->ref_count++;
2730         mutex_unlock(&serial->shared_int->shared_int_lock);
2731 
2732         /* and record this serial */
2733         set_serial_by_index(serial->minor, serial);
2734 
2735         /* setup the proc dirs and files if needed */
2736         hso_log_port(hso_dev);
2737 
2738         /* done, return it */
2739         return hso_dev;
2740 
2741 exit:
2742         if (serial) {
2743                 tty_unregister_device(tty_drv, serial->minor);
2744                 kfree(serial);
2745         }
2746         kfree(hso_dev);
2747         return NULL;
2748 
2749 }
2750 
2751 static void hso_free_shared_int(struct hso_shared_int *mux)
2752 {
2753         usb_free_urb(mux->shared_intr_urb);
2754         kfree(mux->shared_intr_buf);
2755         mutex_unlock(&mux->shared_int_lock);
2756         kfree(mux);
2757 }
2758 
2759 static
2760 struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface)
2761 {
2762         struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL);
2763 
2764         if (!mux)
2765                 return NULL;
2766 
2767         mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT,
2768                                     USB_DIR_IN);
2769         if (!mux->intr_endp) {
2770                 dev_err(&interface->dev, "Can't find INT IN endpoint\n");
2771                 goto exit;
2772         }
2773 
2774         mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL);
2775         if (!mux->shared_intr_urb)
2776                 goto exit;
2777         mux->shared_intr_buf =
2778                 kzalloc(le16_to_cpu(mux->intr_endp->wMaxPacketSize),
2779                         GFP_KERNEL);
2780         if (!mux->shared_intr_buf)
2781                 goto exit;
2782 
2783         mutex_init(&mux->shared_int_lock);
2784 
2785         return mux;
2786 
2787 exit:
2788         kfree(mux->shared_intr_buf);
2789         usb_free_urb(mux->shared_intr_urb);
2790         kfree(mux);
2791         return NULL;
2792 }
2793 
2794 /* Gets the port spec for a certain interface */
2795 static int hso_get_config_data(struct usb_interface *interface)
2796 {
2797         struct usb_device *usbdev = interface_to_usbdev(interface);
2798         u8 *config_data = kmalloc(17, GFP_KERNEL);
2799         u32 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2800         s32 result;
2801 
2802         if (!config_data)
2803                 return -ENOMEM;
2804         if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
2805                             0x86, 0xC0, 0, 0, config_data, 17,
2806                             USB_CTRL_SET_TIMEOUT) != 0x11) {
2807                 kfree(config_data);
2808                 return -EIO;
2809         }
2810 
2811         switch (config_data[if_num]) {
2812         case 0x0:
2813                 result = 0;
2814                 break;
2815         case 0x1:
2816                 result = HSO_PORT_DIAG;
2817                 break;
2818         case 0x2:
2819                 result = HSO_PORT_GPS;
2820                 break;
2821         case 0x3:
2822                 result = HSO_PORT_GPS_CONTROL;
2823                 break;
2824         case 0x4:
2825                 result = HSO_PORT_APP;
2826                 break;
2827         case 0x5:
2828                 result = HSO_PORT_APP2;
2829                 break;
2830         case 0x6:
2831                 result = HSO_PORT_CONTROL;
2832                 break;
2833         case 0x7:
2834                 result = HSO_PORT_NETWORK;
2835                 break;
2836         case 0x8:
2837                 result = HSO_PORT_MODEM;
2838                 break;
2839         case 0x9:
2840                 result = HSO_PORT_MSD;
2841                 break;
2842         case 0xa:
2843                 result = HSO_PORT_PCSC;
2844                 break;
2845         case 0xb:
2846                 result = HSO_PORT_VOICE;
2847                 break;
2848         default:
2849                 result = 0;
2850         }
2851 
2852         if (result)
2853                 result |= HSO_INTF_BULK;
2854 
2855         if (config_data[16] & 0x1)
2856                 result |= HSO_INFO_CRC_BUG;
2857 
2858         kfree(config_data);
2859         return result;
2860 }
2861 
2862 /* called once for each interface upon device insertion */
2863 static int hso_probe(struct usb_interface *interface,
2864                      const struct usb_device_id *id)
2865 {
2866         int mux, i, if_num, port_spec;
2867         unsigned char port_mask;
2868         struct hso_device *hso_dev = NULL;
2869         struct hso_shared_int *shared_int;
2870         struct hso_device *tmp_dev = NULL;
2871 
2872         if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
2873                 dev_err(&interface->dev, "Not our interface\n");
2874                 return -ENODEV;
2875         }
2876 
2877         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2878 
2879         /* Get the interface/port specification from either driver_info or from
2880          * the device itself */
2881         if (id->driver_info)
2882                 port_spec = ((u32 *)(id->driver_info))[if_num];
2883         else
2884                 port_spec = hso_get_config_data(interface);
2885 
2886         /* Check if we need to switch to alt interfaces prior to port
2887          * configuration */
2888         if (interface->num_altsetting > 1)
2889                 usb_set_interface(interface_to_usbdev(interface), if_num, 1);
2890         interface->needs_remote_wakeup = 1;
2891 
2892         /* Allocate new hso device(s) */
2893         switch (port_spec & HSO_INTF_MASK) {
2894         case HSO_INTF_MUX:
2895                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2896                         /* Create the network device */
2897                         if (!disable_net) {
2898                                 hso_dev = hso_create_net_device(interface,
2899                                                                 port_spec);
2900                                 if (!hso_dev)
2901                                         goto exit;
2902                                 tmp_dev = hso_dev;
2903                         }
2904                 }
2905 
2906                 if (hso_get_mux_ports(interface, &port_mask))
2907                         /* TODO: de-allocate everything */
2908                         goto exit;
2909 
2910                 shared_int = hso_create_shared_int(interface);
2911                 if (!shared_int)
2912                         goto exit;
2913 
2914                 for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) {
2915                         if (port_mask & i) {
2916                                 hso_dev = hso_create_mux_serial_device(
2917                                                 interface, i, shared_int);
2918                                 if (!hso_dev)
2919                                         goto exit;
2920                         }
2921                 }
2922 
2923                 if (tmp_dev)
2924                         hso_dev = tmp_dev;
2925                 break;
2926 
2927         case HSO_INTF_BULK:
2928                 /* It's a regular bulk interface */
2929                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2930                         if (!disable_net)
2931                                 hso_dev =
2932                                     hso_create_net_device(interface, port_spec);
2933                 } else {
2934                         hso_dev =
2935                             hso_create_bulk_serial_device(interface, port_spec);
2936                 }
2937                 if (!hso_dev)
2938                         goto exit;
2939                 break;
2940         default:
2941                 goto exit;
2942         }
2943 
2944         /* save our data pointer in this device */
2945         usb_set_intfdata(interface, hso_dev);
2946 
2947         /* done */
2948         return 0;
2949 exit:
2950         hso_free_interface(interface);
2951         return -ENODEV;
2952 }
2953 
2954 /* device removed, cleaning up */
2955 static void hso_disconnect(struct usb_interface *interface)
2956 {
2957         hso_free_interface(interface);
2958 
2959         /* remove reference of our private data */
2960         usb_set_intfdata(interface, NULL);
2961 }
2962 
2963 static void async_get_intf(struct work_struct *data)
2964 {
2965         struct hso_device *hso_dev =
2966             container_of(data, struct hso_device, async_get_intf);
2967         usb_autopm_get_interface(hso_dev->interface);
2968 }
2969 
2970 static void async_put_intf(struct work_struct *data)
2971 {
2972         struct hso_device *hso_dev =
2973             container_of(data, struct hso_device, async_put_intf);
2974         usb_autopm_put_interface(hso_dev->interface);
2975 }
2976 
2977 static int hso_get_activity(struct hso_device *hso_dev)
2978 {
2979         if (hso_dev->usb->state == USB_STATE_SUSPENDED) {
2980                 if (!hso_dev->is_active) {
2981                         hso_dev->is_active = 1;
2982                         schedule_work(&hso_dev->async_get_intf);
2983                 }
2984         }
2985 
2986         if (hso_dev->usb->state != USB_STATE_CONFIGURED)
2987                 return -EAGAIN;
2988 
2989         usb_mark_last_busy(hso_dev->usb);
2990 
2991         return 0;
2992 }
2993 
2994 static int hso_put_activity(struct hso_device *hso_dev)
2995 {
2996         if (hso_dev->usb->state != USB_STATE_SUSPENDED) {
2997                 if (hso_dev->is_active) {
2998                         hso_dev->is_active = 0;
2999                         schedule_work(&hso_dev->async_put_intf);
3000                         return -EAGAIN;
3001                 }
3002         }
3003         hso_dev->is_active = 0;
3004         return 0;
3005 }
3006 
3007 /* called by kernel when we need to suspend device */
3008 static int hso_suspend(struct usb_interface *iface, pm_message_t message)
3009 {
3010         int i, result;
3011 
3012         /* Stop all serial ports */
3013         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3014                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3015                         result = hso_stop_serial_device(serial_table[i]);
3016                         if (result)
3017                                 goto out;
3018                 }
3019         }
3020 
3021         /* Stop all network ports */
3022         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3023                 if (network_table[i] &&
3024                     (network_table[i]->interface == iface)) {
3025                         result = hso_stop_net_device(network_table[i]);
3026                         if (result)
3027                                 goto out;
3028                 }
3029         }
3030 
3031 out:
3032         return 0;
3033 }
3034 
3035 /* called by kernel when we need to resume device */
3036 static int hso_resume(struct usb_interface *iface)
3037 {
3038         int i, result = 0;
3039         struct hso_net *hso_net;
3040 
3041         /* Start all serial ports */
3042         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3043                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3044                         if (dev2ser(serial_table[i])->port.count) {
3045                                 result =
3046                                     hso_start_serial_device(serial_table[i], GFP_NOIO);
3047                                 hso_kick_transmit(dev2ser(serial_table[i]));
3048                                 if (result)
3049                                         goto out;
3050                         }
3051                 }
3052         }
3053 
3054         /* Start all network ports */
3055         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3056                 if (network_table[i] &&
3057                     (network_table[i]->interface == iface)) {
3058                         hso_net = dev2net(network_table[i]);
3059                         if (hso_net->flags & IFF_UP) {
3060                                 /* First transmit any lingering data,
3061                                    then restart the device. */
3062                                 if (hso_net->skb_tx_buf) {
3063                                         dev_dbg(&iface->dev,
3064                                                 "Transmitting"
3065                                                 " lingering data\n");
3066                                         hso_net_start_xmit(hso_net->skb_tx_buf,
3067                                                            hso_net->net);
3068                                         hso_net->skb_tx_buf = NULL;
3069                                 }
3070                                 result = hso_start_net_device(network_table[i]);
3071                                 if (result)
3072                                         goto out;
3073                         }
3074                 }
3075         }
3076 
3077 out:
3078         return result;
3079 }
3080 
3081 static void hso_serial_ref_free(struct kref *ref)
3082 {
3083         struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
3084 
3085         hso_free_serial_device(hso_dev);
3086 }
3087 
3088 static void hso_free_interface(struct usb_interface *interface)
3089 {
3090         struct hso_serial *serial;
3091         int i;
3092 
3093         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3094                 if (serial_table[i] &&
3095                     (serial_table[i]->interface == interface)) {
3096                         serial = dev2ser(serial_table[i]);
3097                         tty_port_tty_hangup(&serial->port, false);
3098                         mutex_lock(&serial->parent->mutex);
3099                         serial->parent->usb_gone = 1;
3100                         mutex_unlock(&serial->parent->mutex);
3101                         cancel_work_sync(&serial_table[i]->async_put_intf);
3102                         cancel_work_sync(&serial_table[i]->async_get_intf);
3103                         hso_serial_tty_unregister(serial);
3104                         kref_put(&serial_table[i]->ref, hso_serial_ref_free);
3105                         set_serial_by_index(i, NULL);
3106                 }
3107         }
3108 
3109         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3110                 if (network_table[i] &&
3111                     (network_table[i]->interface == interface)) {
3112                         struct rfkill *rfk = dev2net(network_table[i])->rfkill;
3113                         /* hso_stop_net_device doesn't stop the net queue since
3114                          * traffic needs to start it again when suspended */
3115                         netif_stop_queue(dev2net(network_table[i])->net);
3116                         hso_stop_net_device(network_table[i]);
3117                         cancel_work_sync(&network_table[i]->async_put_intf);
3118                         cancel_work_sync(&network_table[i]->async_get_intf);
3119                         if (rfk) {
3120                                 rfkill_unregister(rfk);
3121                                 rfkill_destroy(rfk);
3122                         }
3123                         hso_free_net_device(network_table[i]);
3124                 }
3125         }
3126 }
3127 
3128 /* Helper functions */
3129 
3130 /* Get the endpoint ! */
3131 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
3132                                                   int type, int dir)
3133 {
3134         int i;
3135         struct usb_host_interface *iface = intf->cur_altsetting;
3136         struct usb_endpoint_descriptor *endp;
3137 
3138         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3139                 endp = &iface->endpoint[i].desc;
3140                 if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) &&
3141                     (usb_endpoint_type(endp) == type))
3142                         return endp;
3143         }
3144 
3145         return NULL;
3146 }
3147 
3148 /* Get the byte that describes which ports are enabled */
3149 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports)
3150 {
3151         int i;
3152         struct usb_host_interface *iface = intf->cur_altsetting;
3153 
3154         if (iface->extralen == 3) {
3155                 *ports = iface->extra[2];
3156                 return 0;
3157         }
3158 
3159         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3160                 if (iface->endpoint[i].extralen == 3) {
3161                         *ports = iface->endpoint[i].extra[2];
3162                         return 0;
3163                 }
3164         }
3165 
3166         return -1;
3167 }
3168 
3169 /* interrupt urb needs to be submitted, used for serial read of muxed port */
3170 static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int,
3171                                    struct usb_device *usb, gfp_t gfp)
3172 {
3173         int result;
3174 
3175         usb_fill_int_urb(shared_int->shared_intr_urb, usb,
3176                          usb_rcvintpipe(usb,
3177                                 shared_int->intr_endp->bEndpointAddress & 0x7F),
3178                          shared_int->shared_intr_buf,
3179                          1,
3180                          intr_callback, shared_int,
3181                          shared_int->intr_endp->bInterval);
3182 
3183         result = usb_submit_urb(shared_int->shared_intr_urb, gfp);
3184         if (result)
3185                 dev_warn(&usb->dev, "%s failed mux_intr_urb %d\n", __func__,
3186                         result);
3187 
3188         return result;
3189 }
3190 
3191 /* operations setup of the serial interface */
3192 static const struct tty_operations hso_serial_ops = {
3193         .open = hso_serial_open,
3194         .close = hso_serial_close,
3195         .write = hso_serial_write,
3196         .write_room = hso_serial_write_room,
3197         .cleanup = hso_serial_cleanup,
3198         .ioctl = hso_serial_ioctl,
3199         .set_termios = hso_serial_set_termios,
3200         .chars_in_buffer = hso_serial_chars_in_buffer,
3201         .tiocmget = hso_serial_tiocmget,
3202         .tiocmset = hso_serial_tiocmset,
3203         .get_icount = hso_get_count,
3204         .unthrottle = hso_unthrottle
3205 };
3206 
3207 static struct usb_driver hso_driver = {
3208         .name = driver_name,
3209         .probe = hso_probe,
3210         .disconnect = hso_disconnect,
3211         .id_table = hso_ids,
3212         .suspend = hso_suspend,
3213         .resume = hso_resume,
3214         .reset_resume = hso_resume,
3215         .supports_autosuspend = 1,
3216         .disable_hub_initiated_lpm = 1,
3217 };
3218 
3219 static int __init hso_init(void)
3220 {
3221         int i;
3222         int result;
3223 
3224         /* put it in the log */
3225         pr_info("%s\n", version);
3226 
3227         /* Initialise the serial table semaphore and table */
3228         spin_lock_init(&serial_table_lock);
3229         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++)
3230                 serial_table[i] = NULL;
3231 
3232         /* allocate our driver using the proper amount of supported minors */
3233         tty_drv = alloc_tty_driver(HSO_SERIAL_TTY_MINORS);
3234         if (!tty_drv)
3235                 return -ENOMEM;
3236 
3237         /* fill in all needed values */
3238         tty_drv->driver_name = driver_name;
3239         tty_drv->name = tty_filename;
3240 
3241         /* if major number is provided as parameter, use that one */
3242         if (tty_major)
3243                 tty_drv->major = tty_major;
3244 
3245         tty_drv->minor_start = 0;
3246         tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
3247         tty_drv->subtype = SERIAL_TYPE_NORMAL;
3248         tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3249         tty_drv->init_termios = tty_std_termios;
3250         hso_init_termios(&tty_drv->init_termios);
3251         tty_set_operations(tty_drv, &hso_serial_ops);
3252 
3253         /* register the tty driver */
3254         result = tty_register_driver(tty_drv);
3255         if (result) {
3256                 pr_err("%s - tty_register_driver failed(%d)\n",
3257                        __func__, result);
3258                 goto err_free_tty;
3259         }
3260 
3261         /* register this module as an usb driver */
3262         result = usb_register(&hso_driver);
3263         if (result) {
3264                 pr_err("Could not register hso driver - error: %d\n", result);
3265                 goto err_unreg_tty;
3266         }
3267 
3268         /* done */
3269         return 0;
3270 err_unreg_tty:
3271         tty_unregister_driver(tty_drv);
3272 err_free_tty:
3273         put_tty_driver(tty_drv);
3274         return result;
3275 }
3276 
3277 static void __exit hso_exit(void)
3278 {
3279         pr_info("unloaded\n");
3280 
3281         tty_unregister_driver(tty_drv);
3282         put_tty_driver(tty_drv);
3283         /* deregister the usb driver */
3284         usb_deregister(&hso_driver);
3285 }
3286 
3287 /* Module definitions */
3288 module_init(hso_init);
3289 module_exit(hso_exit);
3290 
3291 MODULE_AUTHOR(MOD_AUTHOR);
3292 MODULE_DESCRIPTION(MOD_DESCRIPTION);
3293 MODULE_LICENSE(MOD_LICENSE);
3294 
3295 /* change the debug level (eg: insmod hso.ko debug=0x04) */
3296 MODULE_PARM_DESC(debug, "debug level mask [0x01 | 0x02 | 0x04 | 0x08 | 0x10]");
3297 module_param(debug, int, S_IRUGO | S_IWUSR);
3298 
3299 /* set the major tty number (eg: insmod hso.ko tty_major=245) */
3300 MODULE_PARM_DESC(tty_major, "Set the major tty number");
3301 module_param(tty_major, int, S_IRUGO | S_IWUSR);
3302 
3303 /* disable network interface (eg: insmod hso.ko disable_net=1) */
3304 MODULE_PARM_DESC(disable_net, "Disable the network interface");
3305 module_param(disable_net, int, S_IRUGO | S_IWUSR);
3306 

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