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1/*
2 USB Driver layer for GSM modems
3
4 Copyright (C) 2005 Matthias Urlichs <smurf@smurf.noris.de>
5
6 This driver is free software; you can redistribute it and/or modify
7 it under the terms of Version 2 of the GNU General Public License as
8 published by the Free Software Foundation.
9
10 Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
11
12 History: see the git log.
13
14 Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
15
16 This driver exists because the "normal" serial driver doesn't work too well
17 with GSM modems. Issues:
18 - data loss -- one single Receive URB is not nearly enough
19 - controlling the baud rate doesn't make sense
20*/
21
22#define DRIVER_VERSION "v0.7.2"
23#define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
24#define DRIVER_DESC "USB Driver for GSM modems"
25
26#include <linux/kernel.h>
27#include <linux/jiffies.h>
28#include <linux/errno.h>
29#include <linux/slab.h>
30#include <linux/tty.h>
31#include <linux/tty_flip.h>
32#include <linux/module.h>
33#include <linux/bitops.h>
34#include <linux/uaccess.h>
35#include <linux/usb.h>
36#include <linux/usb/serial.h>
37#include <linux/serial.h>
38#include "usb-wwan.h"
39
40static int debug;
41
42void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
43{
44 struct usb_serial *serial = port->serial;
45 struct usb_wwan_port_private *portdata;
46
47 struct usb_wwan_intf_private *intfdata;
48
49 dbg("%s", __func__);
50
51 intfdata = port->serial->private;
52
53 if (!intfdata->send_setup)
54 return;
55
56 portdata = usb_get_serial_port_data(port);
57 mutex_lock(&serial->disc_mutex);
58 portdata->rts_state = on;
59 portdata->dtr_state = on;
60 if (serial->dev)
61 intfdata->send_setup(port);
62 mutex_unlock(&serial->disc_mutex);
63}
64EXPORT_SYMBOL(usb_wwan_dtr_rts);
65
66void usb_wwan_set_termios(struct tty_struct *tty,
67 struct usb_serial_port *port,
68 struct ktermios *old_termios)
69{
70 struct usb_wwan_intf_private *intfdata = port->serial->private;
71
72 dbg("%s", __func__);
73
74 /* Doesn't support option setting */
75 tty_termios_copy_hw(tty->termios, old_termios);
76
77 if (intfdata->send_setup)
78 intfdata->send_setup(port);
79}
80EXPORT_SYMBOL(usb_wwan_set_termios);
81
82int usb_wwan_tiocmget(struct tty_struct *tty)
83{
84 struct usb_serial_port *port = tty->driver_data;
85 unsigned int value;
86 struct usb_wwan_port_private *portdata;
87
88 portdata = usb_get_serial_port_data(port);
89
90 value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
91 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
92 ((portdata->cts_state) ? TIOCM_CTS : 0) |
93 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
94 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
95 ((portdata->ri_state) ? TIOCM_RNG : 0);
96
97 return value;
98}
99EXPORT_SYMBOL(usb_wwan_tiocmget);
100
101int usb_wwan_tiocmset(struct tty_struct *tty,
102 unsigned int set, unsigned int clear)
103{
104 struct usb_serial_port *port = tty->driver_data;
105 struct usb_wwan_port_private *portdata;
106 struct usb_wwan_intf_private *intfdata;
107
108 portdata = usb_get_serial_port_data(port);
109 intfdata = port->serial->private;
110
111 if (!intfdata->send_setup)
112 return -EINVAL;
113
114 /* FIXME: what locks portdata fields ? */
115 if (set & TIOCM_RTS)
116 portdata->rts_state = 1;
117 if (set & TIOCM_DTR)
118 portdata->dtr_state = 1;
119
120 if (clear & TIOCM_RTS)
121 portdata->rts_state = 0;
122 if (clear & TIOCM_DTR)
123 portdata->dtr_state = 0;
124 return intfdata->send_setup(port);
125}
126EXPORT_SYMBOL(usb_wwan_tiocmset);
127
128static int get_serial_info(struct usb_serial_port *port,
129 struct serial_struct __user *retinfo)
130{
131 struct serial_struct tmp;
132
133 if (!retinfo)
134 return -EFAULT;
135
136 memset(&tmp, 0, sizeof(tmp));
137 tmp.line = port->serial->minor;
138 tmp.port = port->number;
139 tmp.baud_base = tty_get_baud_rate(port->port.tty);
140 tmp.close_delay = port->port.close_delay / 10;
141 tmp.closing_wait = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
142 ASYNC_CLOSING_WAIT_NONE :
143 port->port.closing_wait / 10;
144
145 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
146 return -EFAULT;
147 return 0;
148}
149
150static int set_serial_info(struct usb_serial_port *port,
151 struct serial_struct __user *newinfo)
152{
153 struct serial_struct new_serial;
154 unsigned int closing_wait, close_delay;
155 int retval = 0;
156
157 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
158 return -EFAULT;
159
160 close_delay = new_serial.close_delay * 10;
161 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
162 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
163
164 mutex_lock(&port->port.mutex);
165
166 if (!capable(CAP_SYS_ADMIN)) {
167 if ((close_delay != port->port.close_delay) ||
168 (closing_wait != port->port.closing_wait))
169 retval = -EPERM;
170 else
171 retval = -EOPNOTSUPP;
172 } else {
173 port->port.close_delay = close_delay;
174 port->port.closing_wait = closing_wait;
175 }
176
177 mutex_unlock(&port->port.mutex);
178 return retval;
179}
180
181int usb_wwan_ioctl(struct tty_struct *tty,
182 unsigned int cmd, unsigned long arg)
183{
184 struct usb_serial_port *port = tty->driver_data;
185
186 dbg("%s cmd 0x%04x", __func__, cmd);
187
188 switch (cmd) {
189 case TIOCGSERIAL:
190 return get_serial_info(port,
191 (struct serial_struct __user *) arg);
192 case TIOCSSERIAL:
193 return set_serial_info(port,
194 (struct serial_struct __user *) arg);
195 default:
196 break;
197 }
198
199 dbg("%s arg not supported", __func__);
200
201 return -ENOIOCTLCMD;
202}
203EXPORT_SYMBOL(usb_wwan_ioctl);
204
205/* Write */
206int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
207 const unsigned char *buf, int count)
208{
209 struct usb_wwan_port_private *portdata;
210 struct usb_wwan_intf_private *intfdata;
211 int i;
212 int left, todo;
213 struct urb *this_urb = NULL; /* spurious */
214 int err;
215 unsigned long flags;
216
217 portdata = usb_get_serial_port_data(port);
218 intfdata = port->serial->private;
219
220 dbg("%s: write (%d chars)", __func__, count);
221
222 i = 0;
223 left = count;
224 for (i = 0; left > 0 && i < N_OUT_URB; i++) {
225 todo = left;
226 if (todo > OUT_BUFLEN)
227 todo = OUT_BUFLEN;
228
229 this_urb = portdata->out_urbs[i];
230 if (test_and_set_bit(i, &portdata->out_busy)) {
231 if (time_before(jiffies,
232 portdata->tx_start_time[i] + 10 * HZ))
233 continue;
234 usb_unlink_urb(this_urb);
235 continue;
236 }
237 dbg("%s: endpoint %d buf %d", __func__,
238 usb_pipeendpoint(this_urb->pipe), i);
239
240 err = usb_autopm_get_interface_async(port->serial->interface);
241 if (err < 0)
242 break;
243
244 /* send the data */
245 memcpy(this_urb->transfer_buffer, buf, todo);
246 this_urb->transfer_buffer_length = todo;
247
248 spin_lock_irqsave(&intfdata->susp_lock, flags);
249 if (intfdata->suspended) {
250 usb_anchor_urb(this_urb, &portdata->delayed);
251 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
252 } else {
253 intfdata->in_flight++;
254 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
255 err = usb_submit_urb(this_urb, GFP_ATOMIC);
256 if (err) {
257 dbg("usb_submit_urb %p (write bulk) failed "
258 "(%d)", this_urb, err);
259 clear_bit(i, &portdata->out_busy);
260 spin_lock_irqsave(&intfdata->susp_lock, flags);
261 intfdata->in_flight--;
262 spin_unlock_irqrestore(&intfdata->susp_lock,
263 flags);
264 usb_autopm_put_interface_async(port->serial->interface);
265 break;
266 }
267 }
268
269 portdata->tx_start_time[i] = jiffies;
270 buf += todo;
271 left -= todo;
272 }
273
274 count -= left;
275 dbg("%s: wrote (did %d)", __func__, count);
276 return count;
277}
278EXPORT_SYMBOL(usb_wwan_write);
279
280static void usb_wwan_indat_callback(struct urb *urb)
281{
282 int err;
283 int endpoint;
284 struct usb_serial_port *port;
285 struct tty_struct *tty;
286 unsigned char *data = urb->transfer_buffer;
287 int status = urb->status;
288
289 dbg("%s: %p", __func__, urb);
290
291 endpoint = usb_pipeendpoint(urb->pipe);
292 port = urb->context;
293
294 if (status) {
295 dbg("%s: nonzero status: %d on endpoint %02x.",
296 __func__, status, endpoint);
297 } else {
298 tty = tty_port_tty_get(&port->port);
299 if (tty) {
300 if (urb->actual_length) {
301 tty_insert_flip_string(tty, data,
302 urb->actual_length);
303 tty_flip_buffer_push(tty);
304 } else
305 dbg("%s: empty read urb received", __func__);
306 tty_kref_put(tty);
307 }
308
309 /* Resubmit urb so we continue receiving */
310 if (status != -ESHUTDOWN) {
311 err = usb_submit_urb(urb, GFP_ATOMIC);
312 if (err) {
313 if (err != -EPERM) {
314 printk(KERN_ERR "%s: resubmit read urb failed. "
315 "(%d)", __func__, err);
316 /* busy also in error unless we are killed */
317 usb_mark_last_busy(port->serial->dev);
318 }
319 } else {
320 usb_mark_last_busy(port->serial->dev);
321 }
322 }
323
324 }
325}
326
327static void usb_wwan_outdat_callback(struct urb *urb)
328{
329 struct usb_serial_port *port;
330 struct usb_wwan_port_private *portdata;
331 struct usb_wwan_intf_private *intfdata;
332 int i;
333
334 dbg("%s", __func__);
335
336 port = urb->context;
337 intfdata = port->serial->private;
338
339 usb_serial_port_softint(port);
340 usb_autopm_put_interface_async(port->serial->interface);
341 portdata = usb_get_serial_port_data(port);
342 spin_lock(&intfdata->susp_lock);
343 intfdata->in_flight--;
344 spin_unlock(&intfdata->susp_lock);
345
346 for (i = 0; i < N_OUT_URB; ++i) {
347 if (portdata->out_urbs[i] == urb) {
348 smp_mb__before_clear_bit();
349 clear_bit(i, &portdata->out_busy);
350 break;
351 }
352 }
353}
354
355int usb_wwan_write_room(struct tty_struct *tty)
356{
357 struct usb_serial_port *port = tty->driver_data;
358 struct usb_wwan_port_private *portdata;
359 int i;
360 int data_len = 0;
361 struct urb *this_urb;
362
363 portdata = usb_get_serial_port_data(port);
364
365 for (i = 0; i < N_OUT_URB; i++) {
366 this_urb = portdata->out_urbs[i];
367 if (this_urb && !test_bit(i, &portdata->out_busy))
368 data_len += OUT_BUFLEN;
369 }
370
371 dbg("%s: %d", __func__, data_len);
372 return data_len;
373}
374EXPORT_SYMBOL(usb_wwan_write_room);
375
376int usb_wwan_chars_in_buffer(struct tty_struct *tty)
377{
378 struct usb_serial_port *port = tty->driver_data;
379 struct usb_wwan_port_private *portdata;
380 int i;
381 int data_len = 0;
382 struct urb *this_urb;
383
384 portdata = usb_get_serial_port_data(port);
385
386 for (i = 0; i < N_OUT_URB; i++) {
387 this_urb = portdata->out_urbs[i];
388 /* FIXME: This locking is insufficient as this_urb may
389 go unused during the test */
390 if (this_urb && test_bit(i, &portdata->out_busy))
391 data_len += this_urb->transfer_buffer_length;
392 }
393 dbg("%s: %d", __func__, data_len);
394 return data_len;
395}
396EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
397
398int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
399{
400 struct usb_wwan_port_private *portdata;
401 struct usb_wwan_intf_private *intfdata;
402 struct usb_serial *serial = port->serial;
403 int i, err;
404 struct urb *urb;
405
406 portdata = usb_get_serial_port_data(port);
407 intfdata = serial->private;
408
409 dbg("%s", __func__);
410
411 /* Start reading from the IN endpoint */
412 for (i = 0; i < N_IN_URB; i++) {
413 urb = portdata->in_urbs[i];
414 if (!urb)
415 continue;
416 err = usb_submit_urb(urb, GFP_KERNEL);
417 if (err) {
418 dbg("%s: submit urb %d failed (%d) %d",
419 __func__, i, err, urb->transfer_buffer_length);
420 }
421 }
422
423 if (intfdata->send_setup)
424 intfdata->send_setup(port);
425
426 serial->interface->needs_remote_wakeup = 1;
427 spin_lock_irq(&intfdata->susp_lock);
428 portdata->opened = 1;
429 spin_unlock_irq(&intfdata->susp_lock);
430 /* this balances a get in the generic USB serial code */
431 usb_autopm_put_interface(serial->interface);
432
433 return 0;
434}
435EXPORT_SYMBOL(usb_wwan_open);
436
437void usb_wwan_close(struct usb_serial_port *port)
438{
439 int i;
440 struct usb_serial *serial = port->serial;
441 struct usb_wwan_port_private *portdata;
442 struct usb_wwan_intf_private *intfdata = port->serial->private;
443
444 dbg("%s", __func__);
445 portdata = usb_get_serial_port_data(port);
446
447 if (serial->dev) {
448 /* Stop reading/writing urbs */
449 spin_lock_irq(&intfdata->susp_lock);
450 portdata->opened = 0;
451 spin_unlock_irq(&intfdata->susp_lock);
452
453 for (i = 0; i < N_IN_URB; i++)
454 usb_kill_urb(portdata->in_urbs[i]);
455 for (i = 0; i < N_OUT_URB; i++)
456 usb_kill_urb(portdata->out_urbs[i]);
457 /* balancing - important as an error cannot be handled*/
458 usb_autopm_get_interface_no_resume(serial->interface);
459 serial->interface->needs_remote_wakeup = 0;
460 }
461}
462EXPORT_SYMBOL(usb_wwan_close);
463
464/* Helper functions used by usb_wwan_setup_urbs */
465static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
466 int dir, void *ctx, char *buf, int len,
467 void (*callback) (struct urb *))
468{
469 struct urb *urb;
470
471 if (endpoint == -1)
472 return NULL; /* endpoint not needed */
473
474 urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
475 if (urb == NULL) {
476 dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
477 return NULL;
478 }
479
480 /* Fill URB using supplied data. */
481 usb_fill_bulk_urb(urb, serial->dev,
482 usb_sndbulkpipe(serial->dev, endpoint) | dir,
483 buf, len, callback, ctx);
484
485 return urb;
486}
487
488/* Setup urbs */
489static void usb_wwan_setup_urbs(struct usb_serial *serial)
490{
491 int i, j;
492 struct usb_serial_port *port;
493 struct usb_wwan_port_private *portdata;
494
495 dbg("%s", __func__);
496
497 for (i = 0; i < serial->num_ports; i++) {
498 port = serial->port[i];
499 portdata = usb_get_serial_port_data(port);
500
501 /* Do indat endpoints first */
502 for (j = 0; j < N_IN_URB; ++j) {
503 portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
504 port->
505 bulk_in_endpointAddress,
506 USB_DIR_IN,
507 port,
508 portdata->
509 in_buffer[j],
510 IN_BUFLEN,
511 usb_wwan_indat_callback);
512 }
513
514 /* outdat endpoints */
515 for (j = 0; j < N_OUT_URB; ++j) {
516 portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
517 port->
518 bulk_out_endpointAddress,
519 USB_DIR_OUT,
520 port,
521 portdata->
522 out_buffer
523 [j],
524 OUT_BUFLEN,
525 usb_wwan_outdat_callback);
526 }
527 }
528}
529
530int usb_wwan_startup(struct usb_serial *serial)
531{
532 int i, j, err;
533 struct usb_serial_port *port;
534 struct usb_wwan_port_private *portdata;
535 u8 *buffer;
536
537 dbg("%s", __func__);
538
539 /* Now setup per port private data */
540 for (i = 0; i < serial->num_ports; i++) {
541 port = serial->port[i];
542 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
543 if (!portdata) {
544 dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
545 __func__, i);
546 return 1;
547 }
548 init_usb_anchor(&portdata->delayed);
549
550 for (j = 0; j < N_IN_URB; j++) {
551 buffer = (u8 *) __get_free_page(GFP_KERNEL);
552 if (!buffer)
553 goto bail_out_error;
554 portdata->in_buffer[j] = buffer;
555 }
556
557 for (j = 0; j < N_OUT_URB; j++) {
558 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
559 if (!buffer)
560 goto bail_out_error2;
561 portdata->out_buffer[j] = buffer;
562 }
563
564 usb_set_serial_port_data(port, portdata);
565
566 if (!port->interrupt_in_urb)
567 continue;
568 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
569 if (err)
570 dbg("%s: submit irq_in urb failed %d", __func__, err);
571 }
572 usb_wwan_setup_urbs(serial);
573 return 0;
574
575bail_out_error2:
576 for (j = 0; j < N_OUT_URB; j++)
577 kfree(portdata->out_buffer[j]);
578bail_out_error:
579 for (j = 0; j < N_IN_URB; j++)
580 if (portdata->in_buffer[j])
581 free_page((unsigned long)portdata->in_buffer[j]);
582 kfree(portdata);
583 return 1;
584}
585EXPORT_SYMBOL(usb_wwan_startup);
586
587static void stop_read_write_urbs(struct usb_serial *serial)
588{
589 int i, j;
590 struct usb_serial_port *port;
591 struct usb_wwan_port_private *portdata;
592
593 /* Stop reading/writing urbs */
594 for (i = 0; i < serial->num_ports; ++i) {
595 port = serial->port[i];
596 portdata = usb_get_serial_port_data(port);
597 for (j = 0; j < N_IN_URB; j++)
598 usb_kill_urb(portdata->in_urbs[j]);
599 for (j = 0; j < N_OUT_URB; j++)
600 usb_kill_urb(portdata->out_urbs[j]);
601 }
602}
603
604void usb_wwan_disconnect(struct usb_serial *serial)
605{
606 dbg("%s", __func__);
607
608 stop_read_write_urbs(serial);
609}
610EXPORT_SYMBOL(usb_wwan_disconnect);
611
612void usb_wwan_release(struct usb_serial *serial)
613{
614 int i, j;
615 struct usb_serial_port *port;
616 struct usb_wwan_port_private *portdata;
617
618 dbg("%s", __func__);
619
620 /* Now free them */
621 for (i = 0; i < serial->num_ports; ++i) {
622 port = serial->port[i];
623 portdata = usb_get_serial_port_data(port);
624
625 for (j = 0; j < N_IN_URB; j++) {
626 usb_free_urb(portdata->in_urbs[j]);
627 free_page((unsigned long)
628 portdata->in_buffer[j]);
629 portdata->in_urbs[j] = NULL;
630 }
631 for (j = 0; j < N_OUT_URB; j++) {
632 usb_free_urb(portdata->out_urbs[j]);
633 kfree(portdata->out_buffer[j]);
634 portdata->out_urbs[j] = NULL;
635 }
636 }
637
638 /* Now free per port private data */
639 for (i = 0; i < serial->num_ports; i++) {
640 port = serial->port[i];
641 kfree(usb_get_serial_port_data(port));
642 }
643}
644EXPORT_SYMBOL(usb_wwan_release);
645
646#ifdef CONFIG_PM
647int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
648{
649 struct usb_wwan_intf_private *intfdata = serial->private;
650 int b;
651
652 dbg("%s entered", __func__);
653
654 if (message.event & PM_EVENT_AUTO) {
655 spin_lock_irq(&intfdata->susp_lock);
656 b = intfdata->in_flight;
657 spin_unlock_irq(&intfdata->susp_lock);
658
659 if (b)
660 return -EBUSY;
661 }
662
663 spin_lock_irq(&intfdata->susp_lock);
664 intfdata->suspended = 1;
665 spin_unlock_irq(&intfdata->susp_lock);
666 stop_read_write_urbs(serial);
667
668 return 0;
669}
670EXPORT_SYMBOL(usb_wwan_suspend);
671
672static void unbusy_queued_urb(struct urb *urb, struct usb_wwan_port_private *portdata)
673{
674 int i;
675
676 for (i = 0; i < N_OUT_URB; i++) {
677 if (urb == portdata->out_urbs[i]) {
678 clear_bit(i, &portdata->out_busy);
679 break;
680 }
681 }
682}
683
684static void play_delayed(struct usb_serial_port *port)
685{
686 struct usb_wwan_intf_private *data;
687 struct usb_wwan_port_private *portdata;
688 struct urb *urb;
689 int err;
690
691 portdata = usb_get_serial_port_data(port);
692 data = port->serial->private;
693 while ((urb = usb_get_from_anchor(&portdata->delayed))) {
694 err = usb_submit_urb(urb, GFP_ATOMIC);
695 if (!err) {
696 data->in_flight++;
697 } else {
698 /* we have to throw away the rest */
699 do {
700 unbusy_queued_urb(urb, portdata);
701 usb_autopm_put_interface_no_suspend(port->serial->interface);
702 } while ((urb = usb_get_from_anchor(&portdata->delayed)));
703 break;
704 }
705 }
706}
707
708int usb_wwan_resume(struct usb_serial *serial)
709{
710 int i, j;
711 struct usb_serial_port *port;
712 struct usb_wwan_intf_private *intfdata = serial->private;
713 struct usb_wwan_port_private *portdata;
714 struct urb *urb;
715 int err = 0;
716
717 dbg("%s entered", __func__);
718 /* get the interrupt URBs resubmitted unconditionally */
719 for (i = 0; i < serial->num_ports; i++) {
720 port = serial->port[i];
721 if (!port->interrupt_in_urb) {
722 dbg("%s: No interrupt URB for port %d", __func__, i);
723 continue;
724 }
725 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
726 dbg("Submitted interrupt URB for port %d (result %d)", i, err);
727 if (err < 0) {
728 err("%s: Error %d for interrupt URB of port%d",
729 __func__, err, i);
730 goto err_out;
731 }
732 }
733
734 for (i = 0; i < serial->num_ports; i++) {
735 /* walk all ports */
736 port = serial->port[i];
737 portdata = usb_get_serial_port_data(port);
738
739 /* skip closed ports */
740 spin_lock_irq(&intfdata->susp_lock);
741 if (!portdata->opened) {
742 spin_unlock_irq(&intfdata->susp_lock);
743 continue;
744 }
745
746 for (j = 0; j < N_IN_URB; j++) {
747 urb = portdata->in_urbs[j];
748 err = usb_submit_urb(urb, GFP_ATOMIC);
749 if (err < 0) {
750 err("%s: Error %d for bulk URB %d",
751 __func__, err, i);
752 spin_unlock_irq(&intfdata->susp_lock);
753 goto err_out;
754 }
755 }
756 play_delayed(port);
757 spin_unlock_irq(&intfdata->susp_lock);
758 }
759 spin_lock_irq(&intfdata->susp_lock);
760 intfdata->suspended = 0;
761 spin_unlock_irq(&intfdata->susp_lock);
762err_out:
763 return err;
764}
765EXPORT_SYMBOL(usb_wwan_resume);
766#endif
767
768MODULE_AUTHOR(DRIVER_AUTHOR);
769MODULE_DESCRIPTION(DRIVER_DESC);
770MODULE_VERSION(DRIVER_VERSION);
771MODULE_LICENSE("GPL");
772
773module_param(debug, bool, S_IRUGO | S_IWUSR);
774MODULE_PARM_DESC(debug, "Debug messages");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 USB Driver layer for GSM modems
4
5 Copyright (C) 2005 Matthias Urlichs <smurf@smurf.noris.de>
6
7 Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
8
9 History: see the git log.
10
11 Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
12
13 This driver exists because the "normal" serial driver doesn't work too well
14 with GSM modems. Issues:
15 - data loss -- one single Receive URB is not nearly enough
16 - controlling the baud rate doesn't make sense
17*/
18
19#define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
20#define DRIVER_DESC "USB Driver for GSM modems"
21
22#include <linux/kernel.h>
23#include <linux/jiffies.h>
24#include <linux/errno.h>
25#include <linux/slab.h>
26#include <linux/tty.h>
27#include <linux/tty_flip.h>
28#include <linux/module.h>
29#include <linux/bitops.h>
30#include <linux/uaccess.h>
31#include <linux/usb.h>
32#include <linux/usb/serial.h>
33#include <linux/serial.h>
34#include "usb-wwan.h"
35
36/*
37 * Generate DTR/RTS signals on the port using the SET_CONTROL_LINE_STATE request
38 * in CDC ACM.
39 */
40static int usb_wwan_send_setup(struct usb_serial_port *port)
41{
42 struct usb_serial *serial = port->serial;
43 struct usb_wwan_port_private *portdata;
44 int val = 0;
45 int ifnum;
46 int res;
47
48 portdata = usb_get_serial_port_data(port);
49
50 if (portdata->dtr_state)
51 val |= 0x01;
52 if (portdata->rts_state)
53 val |= 0x02;
54
55 ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
56
57 res = usb_autopm_get_interface(serial->interface);
58 if (res)
59 return res;
60
61 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
62 0x22, 0x21, val, ifnum, NULL, 0,
63 USB_CTRL_SET_TIMEOUT);
64
65 usb_autopm_put_interface(port->serial->interface);
66
67 return res;
68}
69
70void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
71{
72 struct usb_wwan_port_private *portdata;
73 struct usb_wwan_intf_private *intfdata;
74
75 intfdata = usb_get_serial_data(port->serial);
76
77 if (!intfdata->use_send_setup)
78 return;
79
80 portdata = usb_get_serial_port_data(port);
81 /* FIXME: locking */
82 portdata->rts_state = on;
83 portdata->dtr_state = on;
84
85 usb_wwan_send_setup(port);
86}
87EXPORT_SYMBOL(usb_wwan_dtr_rts);
88
89int usb_wwan_tiocmget(struct tty_struct *tty)
90{
91 struct usb_serial_port *port = tty->driver_data;
92 unsigned int value;
93 struct usb_wwan_port_private *portdata;
94
95 portdata = usb_get_serial_port_data(port);
96
97 value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
98 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
99 ((portdata->cts_state) ? TIOCM_CTS : 0) |
100 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
101 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
102 ((portdata->ri_state) ? TIOCM_RNG : 0);
103
104 return value;
105}
106EXPORT_SYMBOL(usb_wwan_tiocmget);
107
108int usb_wwan_tiocmset(struct tty_struct *tty,
109 unsigned int set, unsigned int clear)
110{
111 struct usb_serial_port *port = tty->driver_data;
112 struct usb_wwan_port_private *portdata;
113 struct usb_wwan_intf_private *intfdata;
114
115 portdata = usb_get_serial_port_data(port);
116 intfdata = usb_get_serial_data(port->serial);
117
118 if (!intfdata->use_send_setup)
119 return -EINVAL;
120
121 /* FIXME: what locks portdata fields ? */
122 if (set & TIOCM_RTS)
123 portdata->rts_state = 1;
124 if (set & TIOCM_DTR)
125 portdata->dtr_state = 1;
126
127 if (clear & TIOCM_RTS)
128 portdata->rts_state = 0;
129 if (clear & TIOCM_DTR)
130 portdata->dtr_state = 0;
131 return usb_wwan_send_setup(port);
132}
133EXPORT_SYMBOL(usb_wwan_tiocmset);
134
135int usb_wwan_get_serial_info(struct tty_struct *tty,
136 struct serial_struct *ss)
137{
138 struct usb_serial_port *port = tty->driver_data;
139
140 ss->line = port->minor;
141 ss->port = port->port_number;
142 ss->baud_base = tty_get_baud_rate(port->port.tty);
143 ss->close_delay = port->port.close_delay / 10;
144 ss->closing_wait = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
145 ASYNC_CLOSING_WAIT_NONE :
146 port->port.closing_wait / 10;
147 return 0;
148}
149EXPORT_SYMBOL(usb_wwan_get_serial_info);
150
151int usb_wwan_set_serial_info(struct tty_struct *tty,
152 struct serial_struct *ss)
153{
154 struct usb_serial_port *port = tty->driver_data;
155 unsigned int closing_wait, close_delay;
156 int retval = 0;
157
158 close_delay = ss->close_delay * 10;
159 closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
160 ASYNC_CLOSING_WAIT_NONE : ss->closing_wait * 10;
161
162 mutex_lock(&port->port.mutex);
163
164 if (!capable(CAP_SYS_ADMIN)) {
165 if ((close_delay != port->port.close_delay) ||
166 (closing_wait != port->port.closing_wait))
167 retval = -EPERM;
168 else
169 retval = -EOPNOTSUPP;
170 } else {
171 port->port.close_delay = close_delay;
172 port->port.closing_wait = closing_wait;
173 }
174
175 mutex_unlock(&port->port.mutex);
176 return retval;
177}
178EXPORT_SYMBOL(usb_wwan_set_serial_info);
179
180int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
181 const unsigned char *buf, int count)
182{
183 struct usb_wwan_port_private *portdata;
184 struct usb_wwan_intf_private *intfdata;
185 int i;
186 int left, todo;
187 struct urb *this_urb = NULL; /* spurious */
188 int err;
189 unsigned long flags;
190
191 portdata = usb_get_serial_port_data(port);
192 intfdata = usb_get_serial_data(port->serial);
193
194 dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count);
195
196 i = 0;
197 left = count;
198 for (i = 0; left > 0 && i < N_OUT_URB; i++) {
199 todo = left;
200 if (todo > OUT_BUFLEN)
201 todo = OUT_BUFLEN;
202
203 this_urb = portdata->out_urbs[i];
204 if (test_and_set_bit(i, &portdata->out_busy)) {
205 if (time_before(jiffies,
206 portdata->tx_start_time[i] + 10 * HZ))
207 continue;
208 usb_unlink_urb(this_urb);
209 continue;
210 }
211 dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__,
212 usb_pipeendpoint(this_urb->pipe), i);
213
214 err = usb_autopm_get_interface_async(port->serial->interface);
215 if (err < 0) {
216 clear_bit(i, &portdata->out_busy);
217 break;
218 }
219
220 /* send the data */
221 memcpy(this_urb->transfer_buffer, buf, todo);
222 this_urb->transfer_buffer_length = todo;
223
224 spin_lock_irqsave(&intfdata->susp_lock, flags);
225 if (intfdata->suspended) {
226 usb_anchor_urb(this_urb, &portdata->delayed);
227 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
228 } else {
229 intfdata->in_flight++;
230 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
231 err = usb_submit_urb(this_urb, GFP_ATOMIC);
232 if (err) {
233 dev_err(&port->dev,
234 "%s: submit urb %d failed: %d\n",
235 __func__, i, err);
236 clear_bit(i, &portdata->out_busy);
237 spin_lock_irqsave(&intfdata->susp_lock, flags);
238 intfdata->in_flight--;
239 spin_unlock_irqrestore(&intfdata->susp_lock,
240 flags);
241 usb_autopm_put_interface_async(port->serial->interface);
242 break;
243 }
244 }
245
246 portdata->tx_start_time[i] = jiffies;
247 buf += todo;
248 left -= todo;
249 }
250
251 count -= left;
252 dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count);
253 return count;
254}
255EXPORT_SYMBOL(usb_wwan_write);
256
257static void usb_wwan_indat_callback(struct urb *urb)
258{
259 int err;
260 int endpoint;
261 struct usb_serial_port *port;
262 struct device *dev;
263 unsigned char *data = urb->transfer_buffer;
264 int status = urb->status;
265
266 endpoint = usb_pipeendpoint(urb->pipe);
267 port = urb->context;
268 dev = &port->dev;
269
270 if (status) {
271 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
272 __func__, status, endpoint);
273
274 /* don't resubmit on fatal errors */
275 if (status == -ESHUTDOWN || status == -ENOENT)
276 return;
277 } else {
278 if (urb->actual_length) {
279 tty_insert_flip_string(&port->port, data,
280 urb->actual_length);
281 tty_flip_buffer_push(&port->port);
282 } else
283 dev_dbg(dev, "%s: empty read urb received\n", __func__);
284 }
285 /* Resubmit urb so we continue receiving */
286 err = usb_submit_urb(urb, GFP_ATOMIC);
287 if (err) {
288 if (err != -EPERM && err != -ENODEV) {
289 dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
290 __func__, err);
291 /* busy also in error unless we are killed */
292 usb_mark_last_busy(port->serial->dev);
293 }
294 } else {
295 usb_mark_last_busy(port->serial->dev);
296 }
297}
298
299static void usb_wwan_outdat_callback(struct urb *urb)
300{
301 struct usb_serial_port *port;
302 struct usb_wwan_port_private *portdata;
303 struct usb_wwan_intf_private *intfdata;
304 unsigned long flags;
305 int i;
306
307 port = urb->context;
308 intfdata = usb_get_serial_data(port->serial);
309
310 usb_serial_port_softint(port);
311 usb_autopm_put_interface_async(port->serial->interface);
312 portdata = usb_get_serial_port_data(port);
313 spin_lock_irqsave(&intfdata->susp_lock, flags);
314 intfdata->in_flight--;
315 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
316
317 for (i = 0; i < N_OUT_URB; ++i) {
318 if (portdata->out_urbs[i] == urb) {
319 smp_mb__before_atomic();
320 clear_bit(i, &portdata->out_busy);
321 break;
322 }
323 }
324}
325
326int usb_wwan_write_room(struct tty_struct *tty)
327{
328 struct usb_serial_port *port = tty->driver_data;
329 struct usb_wwan_port_private *portdata;
330 int i;
331 int data_len = 0;
332 struct urb *this_urb;
333
334 portdata = usb_get_serial_port_data(port);
335
336 for (i = 0; i < N_OUT_URB; i++) {
337 this_urb = portdata->out_urbs[i];
338 if (this_urb && !test_bit(i, &portdata->out_busy))
339 data_len += OUT_BUFLEN;
340 }
341
342 dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
343 return data_len;
344}
345EXPORT_SYMBOL(usb_wwan_write_room);
346
347int usb_wwan_chars_in_buffer(struct tty_struct *tty)
348{
349 struct usb_serial_port *port = tty->driver_data;
350 struct usb_wwan_port_private *portdata;
351 int i;
352 int data_len = 0;
353 struct urb *this_urb;
354
355 portdata = usb_get_serial_port_data(port);
356
357 for (i = 0; i < N_OUT_URB; i++) {
358 this_urb = portdata->out_urbs[i];
359 /* FIXME: This locking is insufficient as this_urb may
360 go unused during the test */
361 if (this_urb && test_bit(i, &portdata->out_busy))
362 data_len += this_urb->transfer_buffer_length;
363 }
364 dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
365 return data_len;
366}
367EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
368
369int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
370{
371 struct usb_wwan_port_private *portdata;
372 struct usb_wwan_intf_private *intfdata;
373 struct usb_serial *serial = port->serial;
374 int i, err;
375 struct urb *urb;
376
377 portdata = usb_get_serial_port_data(port);
378 intfdata = usb_get_serial_data(serial);
379
380 if (port->interrupt_in_urb) {
381 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
382 if (err) {
383 dev_err(&port->dev, "%s: submit int urb failed: %d\n",
384 __func__, err);
385 }
386 }
387
388 /* Start reading from the IN endpoint */
389 for (i = 0; i < N_IN_URB; i++) {
390 urb = portdata->in_urbs[i];
391 if (!urb)
392 continue;
393 err = usb_submit_urb(urb, GFP_KERNEL);
394 if (err) {
395 dev_err(&port->dev,
396 "%s: submit read urb %d failed: %d\n",
397 __func__, i, err);
398 }
399 }
400
401 spin_lock_irq(&intfdata->susp_lock);
402 if (++intfdata->open_ports == 1)
403 serial->interface->needs_remote_wakeup = 1;
404 spin_unlock_irq(&intfdata->susp_lock);
405 /* this balances a get in the generic USB serial code */
406 usb_autopm_put_interface(serial->interface);
407
408 return 0;
409}
410EXPORT_SYMBOL(usb_wwan_open);
411
412static void unbusy_queued_urb(struct urb *urb,
413 struct usb_wwan_port_private *portdata)
414{
415 int i;
416
417 for (i = 0; i < N_OUT_URB; i++) {
418 if (urb == portdata->out_urbs[i]) {
419 clear_bit(i, &portdata->out_busy);
420 break;
421 }
422 }
423}
424
425void usb_wwan_close(struct usb_serial_port *port)
426{
427 int i;
428 struct usb_serial *serial = port->serial;
429 struct usb_wwan_port_private *portdata;
430 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
431 struct urb *urb;
432
433 portdata = usb_get_serial_port_data(port);
434
435 /*
436 * Need to take susp_lock to make sure port is not already being
437 * resumed, but no need to hold it due to initialized
438 */
439 spin_lock_irq(&intfdata->susp_lock);
440 if (--intfdata->open_ports == 0)
441 serial->interface->needs_remote_wakeup = 0;
442 spin_unlock_irq(&intfdata->susp_lock);
443
444 for (;;) {
445 urb = usb_get_from_anchor(&portdata->delayed);
446 if (!urb)
447 break;
448 unbusy_queued_urb(urb, portdata);
449 usb_autopm_put_interface_async(serial->interface);
450 }
451
452 for (i = 0; i < N_IN_URB; i++)
453 usb_kill_urb(portdata->in_urbs[i]);
454 for (i = 0; i < N_OUT_URB; i++)
455 usb_kill_urb(portdata->out_urbs[i]);
456 usb_kill_urb(port->interrupt_in_urb);
457
458 usb_autopm_get_interface_no_resume(serial->interface);
459}
460EXPORT_SYMBOL(usb_wwan_close);
461
462static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
463 int endpoint,
464 int dir, void *ctx, char *buf, int len,
465 void (*callback) (struct urb *))
466{
467 struct usb_serial *serial = port->serial;
468 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
469 struct urb *urb;
470
471 urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
472 if (!urb)
473 return NULL;
474
475 usb_fill_bulk_urb(urb, serial->dev,
476 usb_sndbulkpipe(serial->dev, endpoint) | dir,
477 buf, len, callback, ctx);
478
479 if (intfdata->use_zlp && dir == USB_DIR_OUT)
480 urb->transfer_flags |= URB_ZERO_PACKET;
481
482 return urb;
483}
484
485int usb_wwan_port_probe(struct usb_serial_port *port)
486{
487 struct usb_wwan_port_private *portdata;
488 struct urb *urb;
489 u8 *buffer;
490 int i;
491
492 if (!port->bulk_in_size || !port->bulk_out_size)
493 return -ENODEV;
494
495 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
496 if (!portdata)
497 return -ENOMEM;
498
499 init_usb_anchor(&portdata->delayed);
500
501 for (i = 0; i < N_IN_URB; i++) {
502 buffer = (u8 *)__get_free_page(GFP_KERNEL);
503 if (!buffer)
504 goto bail_out_error;
505 portdata->in_buffer[i] = buffer;
506
507 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
508 USB_DIR_IN, port,
509 buffer, IN_BUFLEN,
510 usb_wwan_indat_callback);
511 portdata->in_urbs[i] = urb;
512 }
513
514 for (i = 0; i < N_OUT_URB; i++) {
515 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
516 if (!buffer)
517 goto bail_out_error2;
518 portdata->out_buffer[i] = buffer;
519
520 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
521 USB_DIR_OUT, port,
522 buffer, OUT_BUFLEN,
523 usb_wwan_outdat_callback);
524 portdata->out_urbs[i] = urb;
525 }
526
527 usb_set_serial_port_data(port, portdata);
528
529 return 0;
530
531bail_out_error2:
532 for (i = 0; i < N_OUT_URB; i++) {
533 usb_free_urb(portdata->out_urbs[i]);
534 kfree(portdata->out_buffer[i]);
535 }
536bail_out_error:
537 for (i = 0; i < N_IN_URB; i++) {
538 usb_free_urb(portdata->in_urbs[i]);
539 free_page((unsigned long)portdata->in_buffer[i]);
540 }
541 kfree(portdata);
542
543 return -ENOMEM;
544}
545EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
546
547int usb_wwan_port_remove(struct usb_serial_port *port)
548{
549 int i;
550 struct usb_wwan_port_private *portdata;
551
552 portdata = usb_get_serial_port_data(port);
553 usb_set_serial_port_data(port, NULL);
554
555 for (i = 0; i < N_IN_URB; i++) {
556 usb_free_urb(portdata->in_urbs[i]);
557 free_page((unsigned long)portdata->in_buffer[i]);
558 }
559 for (i = 0; i < N_OUT_URB; i++) {
560 usb_free_urb(portdata->out_urbs[i]);
561 kfree(portdata->out_buffer[i]);
562 }
563
564 kfree(portdata);
565
566 return 0;
567}
568EXPORT_SYMBOL(usb_wwan_port_remove);
569
570#ifdef CONFIG_PM
571static void stop_urbs(struct usb_serial *serial)
572{
573 int i, j;
574 struct usb_serial_port *port;
575 struct usb_wwan_port_private *portdata;
576
577 for (i = 0; i < serial->num_ports; ++i) {
578 port = serial->port[i];
579 portdata = usb_get_serial_port_data(port);
580 if (!portdata)
581 continue;
582 for (j = 0; j < N_IN_URB; j++)
583 usb_kill_urb(portdata->in_urbs[j]);
584 for (j = 0; j < N_OUT_URB; j++)
585 usb_kill_urb(portdata->out_urbs[j]);
586 usb_kill_urb(port->interrupt_in_urb);
587 }
588}
589
590int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
591{
592 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
593
594 spin_lock_irq(&intfdata->susp_lock);
595 if (PMSG_IS_AUTO(message)) {
596 if (intfdata->in_flight) {
597 spin_unlock_irq(&intfdata->susp_lock);
598 return -EBUSY;
599 }
600 }
601 intfdata->suspended = 1;
602 spin_unlock_irq(&intfdata->susp_lock);
603
604 stop_urbs(serial);
605
606 return 0;
607}
608EXPORT_SYMBOL(usb_wwan_suspend);
609
610/* Caller must hold susp_lock. */
611static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port)
612{
613 struct usb_serial *serial = port->serial;
614 struct usb_wwan_intf_private *data = usb_get_serial_data(serial);
615 struct usb_wwan_port_private *portdata;
616 struct urb *urb;
617 int err_count = 0;
618 int err;
619
620 portdata = usb_get_serial_port_data(port);
621
622 for (;;) {
623 urb = usb_get_from_anchor(&portdata->delayed);
624 if (!urb)
625 break;
626
627 err = usb_submit_urb(urb, GFP_ATOMIC);
628 if (err) {
629 dev_err(&port->dev, "%s: submit urb failed: %d\n",
630 __func__, err);
631 err_count++;
632 unbusy_queued_urb(urb, portdata);
633 usb_autopm_put_interface_async(serial->interface);
634 continue;
635 }
636 data->in_flight++;
637 }
638
639 if (err_count)
640 return -EIO;
641
642 return 0;
643}
644
645int usb_wwan_resume(struct usb_serial *serial)
646{
647 int i, j;
648 struct usb_serial_port *port;
649 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
650 struct usb_wwan_port_private *portdata;
651 struct urb *urb;
652 int err;
653 int err_count = 0;
654
655 spin_lock_irq(&intfdata->susp_lock);
656 for (i = 0; i < serial->num_ports; i++) {
657 port = serial->port[i];
658
659 if (!tty_port_initialized(&port->port))
660 continue;
661
662 portdata = usb_get_serial_port_data(port);
663
664 if (port->interrupt_in_urb) {
665 err = usb_submit_urb(port->interrupt_in_urb,
666 GFP_ATOMIC);
667 if (err) {
668 dev_err(&port->dev,
669 "%s: submit int urb failed: %d\n",
670 __func__, err);
671 err_count++;
672 }
673 }
674
675 err = usb_wwan_submit_delayed_urbs(port);
676 if (err)
677 err_count++;
678
679 for (j = 0; j < N_IN_URB; j++) {
680 urb = portdata->in_urbs[j];
681 err = usb_submit_urb(urb, GFP_ATOMIC);
682 if (err < 0) {
683 dev_err(&port->dev,
684 "%s: submit read urb %d failed: %d\n",
685 __func__, i, err);
686 err_count++;
687 }
688 }
689 }
690 intfdata->suspended = 0;
691 spin_unlock_irq(&intfdata->susp_lock);
692
693 if (err_count)
694 return -EIO;
695
696 return 0;
697}
698EXPORT_SYMBOL(usb_wwan_resume);
699#endif
700
701MODULE_AUTHOR(DRIVER_AUTHOR);
702MODULE_DESCRIPTION(DRIVER_DESC);
703MODULE_LICENSE("GPL v2");