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22#define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
23#define DRIVER_DESC "USB Driver for GSM modems"
24
25#include <linux/kernel.h>
26#include <linux/jiffies.h>
27#include <linux/errno.h>
28#include <linux/slab.h>
29#include <linux/tty.h>
30#include <linux/tty_flip.h>
31#include <linux/module.h>
32#include <linux/bitops.h>
33#include <linux/uaccess.h>
34#include <linux/usb.h>
35#include <linux/usb/serial.h>
36#include <linux/serial.h>
37#include "usb-wwan.h"
38
39void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
40{
41 struct usb_wwan_port_private *portdata;
42 struct usb_wwan_intf_private *intfdata;
43
44 intfdata = usb_get_serial_data(port->serial);
45
46 if (!intfdata->send_setup)
47 return;
48
49 portdata = usb_get_serial_port_data(port);
50
51 portdata->rts_state = on;
52 portdata->dtr_state = on;
53
54 intfdata->send_setup(port);
55}
56EXPORT_SYMBOL(usb_wwan_dtr_rts);
57
58int usb_wwan_tiocmget(struct tty_struct *tty)
59{
60 struct usb_serial_port *port = tty->driver_data;
61 unsigned int value;
62 struct usb_wwan_port_private *portdata;
63
64 portdata = usb_get_serial_port_data(port);
65
66 value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
67 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
68 ((portdata->cts_state) ? TIOCM_CTS : 0) |
69 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
70 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
71 ((portdata->ri_state) ? TIOCM_RNG : 0);
72
73 return value;
74}
75EXPORT_SYMBOL(usb_wwan_tiocmget);
76
77int usb_wwan_tiocmset(struct tty_struct *tty,
78 unsigned int set, unsigned int clear)
79{
80 struct usb_serial_port *port = tty->driver_data;
81 struct usb_wwan_port_private *portdata;
82 struct usb_wwan_intf_private *intfdata;
83
84 portdata = usb_get_serial_port_data(port);
85 intfdata = usb_get_serial_data(port->serial);
86
87 if (!intfdata->send_setup)
88 return -EINVAL;
89
90
91 if (set & TIOCM_RTS)
92 portdata->rts_state = 1;
93 if (set & TIOCM_DTR)
94 portdata->dtr_state = 1;
95
96 if (clear & TIOCM_RTS)
97 portdata->rts_state = 0;
98 if (clear & TIOCM_DTR)
99 portdata->dtr_state = 0;
100 return intfdata->send_setup(port);
101}
102EXPORT_SYMBOL(usb_wwan_tiocmset);
103
104static int get_serial_info(struct usb_serial_port *port,
105 struct serial_struct __user *retinfo)
106{
107 struct serial_struct tmp;
108
109 if (!retinfo)
110 return -EFAULT;
111
112 memset(&tmp, 0, sizeof(tmp));
113 tmp.line = port->minor;
114 tmp.port = port->port_number;
115 tmp.baud_base = tty_get_baud_rate(port->port.tty);
116 tmp.close_delay = port->port.close_delay / 10;
117 tmp.closing_wait = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
118 ASYNC_CLOSING_WAIT_NONE :
119 port->port.closing_wait / 10;
120
121 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
122 return -EFAULT;
123 return 0;
124}
125
126static int set_serial_info(struct usb_serial_port *port,
127 struct serial_struct __user *newinfo)
128{
129 struct serial_struct new_serial;
130 unsigned int closing_wait, close_delay;
131 int retval = 0;
132
133 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
134 return -EFAULT;
135
136 close_delay = new_serial.close_delay * 10;
137 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
138 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
139
140 mutex_lock(&port->port.mutex);
141
142 if (!capable(CAP_SYS_ADMIN)) {
143 if ((close_delay != port->port.close_delay) ||
144 (closing_wait != port->port.closing_wait))
145 retval = -EPERM;
146 else
147 retval = -EOPNOTSUPP;
148 } else {
149 port->port.close_delay = close_delay;
150 port->port.closing_wait = closing_wait;
151 }
152
153 mutex_unlock(&port->port.mutex);
154 return retval;
155}
156
157int usb_wwan_ioctl(struct tty_struct *tty,
158 unsigned int cmd, unsigned long arg)
159{
160 struct usb_serial_port *port = tty->driver_data;
161
162 dev_dbg(&port->dev, "%s cmd 0x%04x\n", __func__, cmd);
163
164 switch (cmd) {
165 case TIOCGSERIAL:
166 return get_serial_info(port,
167 (struct serial_struct __user *) arg);
168 case TIOCSSERIAL:
169 return set_serial_info(port,
170 (struct serial_struct __user *) arg);
171 default:
172 break;
173 }
174
175 dev_dbg(&port->dev, "%s arg not supported\n", __func__);
176
177 return -ENOIOCTLCMD;
178}
179EXPORT_SYMBOL(usb_wwan_ioctl);
180
181int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
182 const unsigned char *buf, int count)
183{
184 struct usb_wwan_port_private *portdata;
185 struct usb_wwan_intf_private *intfdata;
186 int i;
187 int left, todo;
188 struct urb *this_urb = NULL;
189 int err;
190 unsigned long flags;
191
192 portdata = usb_get_serial_port_data(port);
193 intfdata = usb_get_serial_data(port->serial);
194
195 dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count);
196
197 i = 0;
198 left = count;
199 for (i = 0; left > 0 && i < N_OUT_URB; i++) {
200 todo = left;
201 if (todo > OUT_BUFLEN)
202 todo = OUT_BUFLEN;
203
204 this_urb = portdata->out_urbs[i];
205 if (test_and_set_bit(i, &portdata->out_busy)) {
206 if (time_before(jiffies,
207 portdata->tx_start_time[i] + 10 * HZ))
208 continue;
209 usb_unlink_urb(this_urb);
210 continue;
211 }
212 dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__,
213 usb_pipeendpoint(this_urb->pipe), i);
214
215 err = usb_autopm_get_interface_async(port->serial->interface);
216 if (err < 0) {
217 clear_bit(i, &portdata->out_busy);
218 break;
219 }
220
221
222 memcpy(this_urb->transfer_buffer, buf, todo);
223 this_urb->transfer_buffer_length = todo;
224
225 spin_lock_irqsave(&intfdata->susp_lock, flags);
226 if (intfdata->suspended) {
227 usb_anchor_urb(this_urb, &portdata->delayed);
228 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
229 } else {
230 intfdata->in_flight++;
231 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
232 err = usb_submit_urb(this_urb, GFP_ATOMIC);
233 if (err) {
234 dev_err(&port->dev,
235 "%s: submit urb %d failed: %d\n",
236 __func__, i, err);
237 clear_bit(i, &portdata->out_busy);
238 spin_lock_irqsave(&intfdata->susp_lock, flags);
239 intfdata->in_flight--;
240 spin_unlock_irqrestore(&intfdata->susp_lock,
241 flags);
242 usb_autopm_put_interface_async(port->serial->interface);
243 break;
244 }
245 }
246
247 portdata->tx_start_time[i] = jiffies;
248 buf += todo;
249 left -= todo;
250 }
251
252 count -= left;
253 dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count);
254 return count;
255}
256EXPORT_SYMBOL(usb_wwan_write);
257
258static void usb_wwan_indat_callback(struct urb *urb)
259{
260 int err;
261 int endpoint;
262 struct usb_serial_port *port;
263 struct device *dev;
264 unsigned char *data = urb->transfer_buffer;
265 int status = urb->status;
266
267 endpoint = usb_pipeendpoint(urb->pipe);
268 port = urb->context;
269 dev = &port->dev;
270
271 if (status) {
272 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
273 __func__, status, endpoint);
274 } else {
275 if (urb->actual_length) {
276 tty_insert_flip_string(&port->port, data,
277 urb->actual_length);
278 tty_flip_buffer_push(&port->port);
279 } else
280 dev_dbg(dev, "%s: empty read urb received\n", __func__);
281 }
282
283 err = usb_submit_urb(urb, GFP_ATOMIC);
284 if (err) {
285 if (err != -EPERM) {
286 dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
287 __func__, err);
288
289 usb_mark_last_busy(port->serial->dev);
290 }
291 } else {
292 usb_mark_last_busy(port->serial->dev);
293 }
294}
295
296static void usb_wwan_outdat_callback(struct urb *urb)
297{
298 struct usb_serial_port *port;
299 struct usb_wwan_port_private *portdata;
300 struct usb_wwan_intf_private *intfdata;
301 int i;
302
303 port = urb->context;
304 intfdata = usb_get_serial_data(port->serial);
305
306 usb_serial_port_softint(port);
307 usb_autopm_put_interface_async(port->serial->interface);
308 portdata = usb_get_serial_port_data(port);
309 spin_lock(&intfdata->susp_lock);
310 intfdata->in_flight--;
311 spin_unlock(&intfdata->susp_lock);
312
313 for (i = 0; i < N_OUT_URB; ++i) {
314 if (portdata->out_urbs[i] == urb) {
315 smp_mb__before_atomic();
316 clear_bit(i, &portdata->out_busy);
317 break;
318 }
319 }
320}
321
322int usb_wwan_write_room(struct tty_struct *tty)
323{
324 struct usb_serial_port *port = tty->driver_data;
325 struct usb_wwan_port_private *portdata;
326 int i;
327 int data_len = 0;
328 struct urb *this_urb;
329
330 portdata = usb_get_serial_port_data(port);
331
332 for (i = 0; i < N_OUT_URB; i++) {
333 this_urb = portdata->out_urbs[i];
334 if (this_urb && !test_bit(i, &portdata->out_busy))
335 data_len += OUT_BUFLEN;
336 }
337
338 dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
339 return data_len;
340}
341EXPORT_SYMBOL(usb_wwan_write_room);
342
343int usb_wwan_chars_in_buffer(struct tty_struct *tty)
344{
345 struct usb_serial_port *port = tty->driver_data;
346 struct usb_wwan_port_private *portdata;
347 int i;
348 int data_len = 0;
349 struct urb *this_urb;
350
351 portdata = usb_get_serial_port_data(port);
352
353 for (i = 0; i < N_OUT_URB; i++) {
354 this_urb = portdata->out_urbs[i];
355
356
357 if (this_urb && test_bit(i, &portdata->out_busy))
358 data_len += this_urb->transfer_buffer_length;
359 }
360 dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
361 return data_len;
362}
363EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
364
365int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
366{
367 struct usb_wwan_port_private *portdata;
368 struct usb_wwan_intf_private *intfdata;
369 struct usb_serial *serial = port->serial;
370 int i, err;
371 struct urb *urb;
372
373 portdata = usb_get_serial_port_data(port);
374 intfdata = usb_get_serial_data(serial);
375
376 if (port->interrupt_in_urb) {
377 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
378 if (err) {
379 dev_err(&port->dev, "%s: submit int urb failed: %d\n",
380 __func__, err);
381 }
382 }
383
384
385 for (i = 0; i < N_IN_URB; i++) {
386 urb = portdata->in_urbs[i];
387 if (!urb)
388 continue;
389 err = usb_submit_urb(urb, GFP_KERNEL);
390 if (err) {
391 dev_err(&port->dev,
392 "%s: submit read urb %d failed: %d\n",
393 __func__, i, err);
394 }
395 }
396
397 spin_lock_irq(&intfdata->susp_lock);
398 if (++intfdata->open_ports == 1)
399 serial->interface->needs_remote_wakeup = 1;
400 spin_unlock_irq(&intfdata->susp_lock);
401
402 usb_autopm_put_interface(serial->interface);
403
404 return 0;
405}
406EXPORT_SYMBOL(usb_wwan_open);
407
408static void unbusy_queued_urb(struct urb *urb,
409 struct usb_wwan_port_private *portdata)
410{
411 int i;
412
413 for (i = 0; i < N_OUT_URB; i++) {
414 if (urb == portdata->out_urbs[i]) {
415 clear_bit(i, &portdata->out_busy);
416 break;
417 }
418 }
419}
420
421void usb_wwan_close(struct usb_serial_port *port)
422{
423 int i;
424 struct usb_serial *serial = port->serial;
425 struct usb_wwan_port_private *portdata;
426 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
427 struct urb *urb;
428
429 portdata = usb_get_serial_port_data(port);
430
431
432
433
434
435 spin_lock_irq(&intfdata->susp_lock);
436 if (--intfdata->open_ports == 0)
437 serial->interface->needs_remote_wakeup = 0;
438 spin_unlock_irq(&intfdata->susp_lock);
439
440 for (;;) {
441 urb = usb_get_from_anchor(&portdata->delayed);
442 if (!urb)
443 break;
444 unbusy_queued_urb(urb, portdata);
445 usb_autopm_put_interface_async(serial->interface);
446 }
447
448 for (i = 0; i < N_IN_URB; i++)
449 usb_kill_urb(portdata->in_urbs[i]);
450 for (i = 0; i < N_OUT_URB; i++)
451 usb_kill_urb(portdata->out_urbs[i]);
452 usb_kill_urb(port->interrupt_in_urb);
453
454 usb_autopm_get_interface_no_resume(serial->interface);
455}
456EXPORT_SYMBOL(usb_wwan_close);
457
458static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
459 int endpoint,
460 int dir, void *ctx, char *buf, int len,
461 void (*callback) (struct urb *))
462{
463 struct usb_serial *serial = port->serial;
464 struct urb *urb;
465
466 urb = usb_alloc_urb(0, GFP_KERNEL);
467 if (!urb)
468 return NULL;
469
470 usb_fill_bulk_urb(urb, serial->dev,
471 usb_sndbulkpipe(serial->dev, endpoint) | dir,
472 buf, len, callback, ctx);
473
474 return urb;
475}
476
477int usb_wwan_port_probe(struct usb_serial_port *port)
478{
479 struct usb_wwan_port_private *portdata;
480 struct urb *urb;
481 u8 *buffer;
482 int i;
483
484 if (!port->bulk_in_size || !port->bulk_out_size)
485 return -ENODEV;
486
487 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
488 if (!portdata)
489 return -ENOMEM;
490
491 init_usb_anchor(&portdata->delayed);
492
493 for (i = 0; i < N_IN_URB; i++) {
494 buffer = (u8 *)__get_free_page(GFP_KERNEL);
495 if (!buffer)
496 goto bail_out_error;
497 portdata->in_buffer[i] = buffer;
498
499 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
500 USB_DIR_IN, port,
501 buffer, IN_BUFLEN,
502 usb_wwan_indat_callback);
503 portdata->in_urbs[i] = urb;
504 }
505
506 for (i = 0; i < N_OUT_URB; i++) {
507 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
508 if (!buffer)
509 goto bail_out_error2;
510 portdata->out_buffer[i] = buffer;
511
512 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
513 USB_DIR_OUT, port,
514 buffer, OUT_BUFLEN,
515 usb_wwan_outdat_callback);
516 portdata->out_urbs[i] = urb;
517 }
518
519 usb_set_serial_port_data(port, portdata);
520
521 return 0;
522
523bail_out_error2:
524 for (i = 0; i < N_OUT_URB; i++) {
525 usb_free_urb(portdata->out_urbs[i]);
526 kfree(portdata->out_buffer[i]);
527 }
528bail_out_error:
529 for (i = 0; i < N_IN_URB; i++) {
530 usb_free_urb(portdata->in_urbs[i]);
531 free_page((unsigned long)portdata->in_buffer[i]);
532 }
533 kfree(portdata);
534
535 return -ENOMEM;
536}
537EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
538
539int usb_wwan_port_remove(struct usb_serial_port *port)
540{
541 int i;
542 struct usb_wwan_port_private *portdata;
543
544 portdata = usb_get_serial_port_data(port);
545 usb_set_serial_port_data(port, NULL);
546
547 for (i = 0; i < N_IN_URB; i++) {
548 usb_free_urb(portdata->in_urbs[i]);
549 free_page((unsigned long)portdata->in_buffer[i]);
550 }
551 for (i = 0; i < N_OUT_URB; i++) {
552 usb_free_urb(portdata->out_urbs[i]);
553 kfree(portdata->out_buffer[i]);
554 }
555
556 kfree(portdata);
557
558 return 0;
559}
560EXPORT_SYMBOL(usb_wwan_port_remove);
561
562#ifdef CONFIG_PM
563static void stop_urbs(struct usb_serial *serial)
564{
565 int i, j;
566 struct usb_serial_port *port;
567 struct usb_wwan_port_private *portdata;
568
569 for (i = 0; i < serial->num_ports; ++i) {
570 port = serial->port[i];
571 portdata = usb_get_serial_port_data(port);
572 if (!portdata)
573 continue;
574 for (j = 0; j < N_IN_URB; j++)
575 usb_kill_urb(portdata->in_urbs[j]);
576 for (j = 0; j < N_OUT_URB; j++)
577 usb_kill_urb(portdata->out_urbs[j]);
578 usb_kill_urb(port->interrupt_in_urb);
579 }
580}
581
582int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
583{
584 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
585
586 spin_lock_irq(&intfdata->susp_lock);
587 if (PMSG_IS_AUTO(message)) {
588 if (intfdata->in_flight) {
589 spin_unlock_irq(&intfdata->susp_lock);
590 return -EBUSY;
591 }
592 }
593 intfdata->suspended = 1;
594 spin_unlock_irq(&intfdata->susp_lock);
595
596 stop_urbs(serial);
597
598 return 0;
599}
600EXPORT_SYMBOL(usb_wwan_suspend);
601
602
603static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port)
604{
605 struct usb_serial *serial = port->serial;
606 struct usb_wwan_intf_private *data = usb_get_serial_data(serial);
607 struct usb_wwan_port_private *portdata;
608 struct urb *urb;
609 int err_count = 0;
610 int err;
611
612 portdata = usb_get_serial_port_data(port);
613
614 for (;;) {
615 urb = usb_get_from_anchor(&portdata->delayed);
616 if (!urb)
617 break;
618
619 err = usb_submit_urb(urb, GFP_ATOMIC);
620 if (err) {
621 dev_err(&port->dev, "%s: submit urb failed: %d\n",
622 __func__, err);
623 err_count++;
624 unbusy_queued_urb(urb, portdata);
625 usb_autopm_put_interface_async(serial->interface);
626 continue;
627 }
628 data->in_flight++;
629 }
630
631 if (err_count)
632 return -EIO;
633
634 return 0;
635}
636
637int usb_wwan_resume(struct usb_serial *serial)
638{
639 int i, j;
640 struct usb_serial_port *port;
641 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
642 struct usb_wwan_port_private *portdata;
643 struct urb *urb;
644 int err;
645 int err_count = 0;
646
647 spin_lock_irq(&intfdata->susp_lock);
648 for (i = 0; i < serial->num_ports; i++) {
649 port = serial->port[i];
650
651 if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags))
652 continue;
653
654 portdata = usb_get_serial_port_data(port);
655
656 if (port->interrupt_in_urb) {
657 err = usb_submit_urb(port->interrupt_in_urb,
658 GFP_ATOMIC);
659 if (err) {
660 dev_err(&port->dev,
661 "%s: submit int urb failed: %d\n",
662 __func__, err);
663 err_count++;
664 }
665 }
666
667 err = usb_wwan_submit_delayed_urbs(port);
668 if (err)
669 err_count++;
670
671 for (j = 0; j < N_IN_URB; j++) {
672 urb = portdata->in_urbs[j];
673 err = usb_submit_urb(urb, GFP_ATOMIC);
674 if (err < 0) {
675 dev_err(&port->dev,
676 "%s: submit read urb %d failed: %d\n",
677 __func__, i, err);
678 err_count++;
679 }
680 }
681 }
682 intfdata->suspended = 0;
683 spin_unlock_irq(&intfdata->susp_lock);
684
685 if (err_count)
686 return -EIO;
687
688 return 0;
689}
690EXPORT_SYMBOL(usb_wwan_resume);
691#endif
692
693MODULE_AUTHOR(DRIVER_AUTHOR);
694MODULE_DESCRIPTION(DRIVER_DESC);
695MODULE_LICENSE("GPL");
696
