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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
38
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
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
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;
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
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 } else {
274 if (urb->actual_length) {
275 tty_insert_flip_string(&port->port, data,
276 urb->actual_length);
277 tty_flip_buffer_push(&port->port);
278 } else
279 dev_dbg(dev, "%s: empty read urb received\n", __func__);
280 }
281
282 err = usb_submit_urb(urb, GFP_ATOMIC);
283 if (err) {
284 if (err != -EPERM && err != -ENODEV) {
285 dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
286 __func__, err);
287
288 usb_mark_last_busy(port->serial->dev);
289 }
290 } else {
291 usb_mark_last_busy(port->serial->dev);
292 }
293}
294
295static void usb_wwan_outdat_callback(struct urb *urb)
296{
297 struct usb_serial_port *port;
298 struct usb_wwan_port_private *portdata;
299 struct usb_wwan_intf_private *intfdata;
300 unsigned long flags;
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_irqsave(&intfdata->susp_lock, flags);
310 intfdata->in_flight--;
311 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
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 (!tty_port_initialized(&port->port))
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 v2");
696
