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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_write(struct tty_struct *tty, struct usb_serial_port *port,
136 const unsigned char *buf, int count)
137{
138 struct usb_wwan_port_private *portdata;
139 struct usb_wwan_intf_private *intfdata;
140 int i;
141 int left, todo;
142 struct urb *this_urb = NULL;
143 int err;
144 unsigned long flags;
145
146 portdata = usb_get_serial_port_data(port);
147 intfdata = usb_get_serial_data(port->serial);
148
149 dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count);
150
151 left = count;
152 for (i = 0; left > 0 && i < N_OUT_URB; i++) {
153 todo = left;
154 if (todo > OUT_BUFLEN)
155 todo = OUT_BUFLEN;
156
157 this_urb = portdata->out_urbs[i];
158 if (test_and_set_bit(i, &portdata->out_busy)) {
159 if (time_before(jiffies,
160 portdata->tx_start_time[i] + 10 * HZ))
161 continue;
162 usb_unlink_urb(this_urb);
163 continue;
164 }
165 dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__,
166 usb_pipeendpoint(this_urb->pipe), i);
167
168 err = usb_autopm_get_interface_async(port->serial->interface);
169 if (err < 0) {
170 clear_bit(i, &portdata->out_busy);
171 break;
172 }
173
174
175 memcpy(this_urb->transfer_buffer, buf, todo);
176 this_urb->transfer_buffer_length = todo;
177
178 spin_lock_irqsave(&intfdata->susp_lock, flags);
179 if (intfdata->suspended) {
180 usb_anchor_urb(this_urb, &portdata->delayed);
181 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
182 } else {
183 intfdata->in_flight++;
184 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
185 err = usb_submit_urb(this_urb, GFP_ATOMIC);
186 if (err) {
187 dev_err(&port->dev,
188 "%s: submit urb %d failed: %d\n",
189 __func__, i, err);
190 clear_bit(i, &portdata->out_busy);
191 spin_lock_irqsave(&intfdata->susp_lock, flags);
192 intfdata->in_flight--;
193 spin_unlock_irqrestore(&intfdata->susp_lock,
194 flags);
195 usb_autopm_put_interface_async(port->serial->interface);
196 break;
197 }
198 }
199
200 portdata->tx_start_time[i] = jiffies;
201 buf += todo;
202 left -= todo;
203 }
204
205 count -= left;
206 dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count);
207 return count;
208}
209EXPORT_SYMBOL(usb_wwan_write);
210
211static void usb_wwan_indat_callback(struct urb *urb)
212{
213 int err;
214 int endpoint;
215 struct usb_serial_port *port;
216 struct device *dev;
217 unsigned char *data = urb->transfer_buffer;
218 int status = urb->status;
219
220 endpoint = usb_pipeendpoint(urb->pipe);
221 port = urb->context;
222 dev = &port->dev;
223
224 if (status) {
225 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
226 __func__, status, endpoint);
227
228
229 if (status == -ESHUTDOWN || status == -ENOENT)
230 return;
231 } else {
232 if (urb->actual_length) {
233 tty_insert_flip_string(&port->port, data,
234 urb->actual_length);
235 tty_flip_buffer_push(&port->port);
236 } else
237 dev_dbg(dev, "%s: empty read urb received\n", __func__);
238 }
239
240 err = usb_submit_urb(urb, GFP_ATOMIC);
241 if (err) {
242 if (err != -EPERM && err != -ENODEV) {
243 dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
244 __func__, err);
245
246 usb_mark_last_busy(port->serial->dev);
247 }
248 } else {
249 usb_mark_last_busy(port->serial->dev);
250 }
251}
252
253static void usb_wwan_outdat_callback(struct urb *urb)
254{
255 struct usb_serial_port *port;
256 struct usb_wwan_port_private *portdata;
257 struct usb_wwan_intf_private *intfdata;
258 unsigned long flags;
259 int i;
260
261 port = urb->context;
262 intfdata = usb_get_serial_data(port->serial);
263
264 usb_serial_port_softint(port);
265 usb_autopm_put_interface_async(port->serial->interface);
266 portdata = usb_get_serial_port_data(port);
267 spin_lock_irqsave(&intfdata->susp_lock, flags);
268 intfdata->in_flight--;
269 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
270
271 for (i = 0; i < N_OUT_URB; ++i) {
272 if (portdata->out_urbs[i] == urb) {
273 smp_mb__before_atomic();
274 clear_bit(i, &portdata->out_busy);
275 break;
276 }
277 }
278}
279
280unsigned int usb_wwan_write_room(struct tty_struct *tty)
281{
282 struct usb_serial_port *port = tty->driver_data;
283 struct usb_wwan_port_private *portdata;
284 int i;
285 unsigned int data_len = 0;
286 struct urb *this_urb;
287
288 portdata = usb_get_serial_port_data(port);
289
290 for (i = 0; i < N_OUT_URB; i++) {
291 this_urb = portdata->out_urbs[i];
292 if (this_urb && !test_bit(i, &portdata->out_busy))
293 data_len += OUT_BUFLEN;
294 }
295
296 dev_dbg(&port->dev, "%s: %u\n", __func__, data_len);
297 return data_len;
298}
299EXPORT_SYMBOL(usb_wwan_write_room);
300
301unsigned int usb_wwan_chars_in_buffer(struct tty_struct *tty)
302{
303 struct usb_serial_port *port = tty->driver_data;
304 struct usb_wwan_port_private *portdata;
305 int i;
306 unsigned int data_len = 0;
307 struct urb *this_urb;
308
309 portdata = usb_get_serial_port_data(port);
310
311 for (i = 0; i < N_OUT_URB; i++) {
312 this_urb = portdata->out_urbs[i];
313
314
315 if (this_urb && test_bit(i, &portdata->out_busy))
316 data_len += this_urb->transfer_buffer_length;
317 }
318 dev_dbg(&port->dev, "%s: %u\n", __func__, data_len);
319 return data_len;
320}
321EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
322
323int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
324{
325 struct usb_wwan_port_private *portdata;
326 struct usb_wwan_intf_private *intfdata;
327 struct usb_serial *serial = port->serial;
328 int i, err;
329 struct urb *urb;
330
331 portdata = usb_get_serial_port_data(port);
332 intfdata = usb_get_serial_data(serial);
333
334 if (port->interrupt_in_urb) {
335 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
336 if (err) {
337 dev_err(&port->dev, "%s: submit int urb failed: %d\n",
338 __func__, err);
339 }
340 }
341
342
343 for (i = 0; i < N_IN_URB; i++) {
344 urb = portdata->in_urbs[i];
345 if (!urb)
346 continue;
347 err = usb_submit_urb(urb, GFP_KERNEL);
348 if (err) {
349 dev_err(&port->dev,
350 "%s: submit read urb %d failed: %d\n",
351 __func__, i, err);
352 }
353 }
354
355 spin_lock_irq(&intfdata->susp_lock);
356 if (++intfdata->open_ports == 1)
357 serial->interface->needs_remote_wakeup = 1;
358 spin_unlock_irq(&intfdata->susp_lock);
359
360 usb_autopm_put_interface(serial->interface);
361
362 return 0;
363}
364EXPORT_SYMBOL(usb_wwan_open);
365
366static void unbusy_queued_urb(struct urb *urb,
367 struct usb_wwan_port_private *portdata)
368{
369 int i;
370
371 for (i = 0; i < N_OUT_URB; i++) {
372 if (urb == portdata->out_urbs[i]) {
373 clear_bit(i, &portdata->out_busy);
374 break;
375 }
376 }
377}
378
379void usb_wwan_close(struct usb_serial_port *port)
380{
381 int i;
382 struct usb_serial *serial = port->serial;
383 struct usb_wwan_port_private *portdata;
384 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
385 struct urb *urb;
386
387 portdata = usb_get_serial_port_data(port);
388
389
390
391
392
393 spin_lock_irq(&intfdata->susp_lock);
394 if (--intfdata->open_ports == 0)
395 serial->interface->needs_remote_wakeup = 0;
396 spin_unlock_irq(&intfdata->susp_lock);
397
398 for (;;) {
399 urb = usb_get_from_anchor(&portdata->delayed);
400 if (!urb)
401 break;
402 unbusy_queued_urb(urb, portdata);
403 usb_autopm_put_interface_async(serial->interface);
404 }
405
406 for (i = 0; i < N_IN_URB; i++)
407 usb_kill_urb(portdata->in_urbs[i]);
408 for (i = 0; i < N_OUT_URB; i++)
409 usb_kill_urb(portdata->out_urbs[i]);
410 usb_kill_urb(port->interrupt_in_urb);
411
412 usb_autopm_get_interface_no_resume(serial->interface);
413}
414EXPORT_SYMBOL(usb_wwan_close);
415
416static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
417 int endpoint,
418 int dir, void *ctx, char *buf, int len,
419 void (*callback) (struct urb *))
420{
421 struct usb_serial *serial = port->serial;
422 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
423 struct urb *urb;
424
425 urb = usb_alloc_urb(0, GFP_KERNEL);
426 if (!urb)
427 return NULL;
428
429 usb_fill_bulk_urb(urb, serial->dev,
430 usb_sndbulkpipe(serial->dev, endpoint) | dir,
431 buf, len, callback, ctx);
432
433 if (intfdata->use_zlp && dir == USB_DIR_OUT)
434 urb->transfer_flags |= URB_ZERO_PACKET;
435
436 return urb;
437}
438
439int usb_wwan_port_probe(struct usb_serial_port *port)
440{
441 struct usb_wwan_port_private *portdata;
442 struct urb *urb;
443 u8 *buffer;
444 int i;
445
446 if (!port->bulk_in_size || !port->bulk_out_size)
447 return -ENODEV;
448
449 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
450 if (!portdata)
451 return -ENOMEM;
452
453 init_usb_anchor(&portdata->delayed);
454
455 for (i = 0; i < N_IN_URB; i++) {
456 buffer = (u8 *)__get_free_page(GFP_KERNEL);
457 if (!buffer)
458 goto bail_out_error;
459 portdata->in_buffer[i] = buffer;
460
461 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
462 USB_DIR_IN, port,
463 buffer, IN_BUFLEN,
464 usb_wwan_indat_callback);
465 portdata->in_urbs[i] = urb;
466 }
467
468 for (i = 0; i < N_OUT_URB; i++) {
469 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
470 if (!buffer)
471 goto bail_out_error2;
472 portdata->out_buffer[i] = buffer;
473
474 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
475 USB_DIR_OUT, port,
476 buffer, OUT_BUFLEN,
477 usb_wwan_outdat_callback);
478 portdata->out_urbs[i] = urb;
479 }
480
481 usb_set_serial_port_data(port, portdata);
482
483 return 0;
484
485bail_out_error2:
486 for (i = 0; i < N_OUT_URB; i++) {
487 usb_free_urb(portdata->out_urbs[i]);
488 kfree(portdata->out_buffer[i]);
489 }
490bail_out_error:
491 for (i = 0; i < N_IN_URB; i++) {
492 usb_free_urb(portdata->in_urbs[i]);
493 free_page((unsigned long)portdata->in_buffer[i]);
494 }
495 kfree(portdata);
496
497 return -ENOMEM;
498}
499EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
500
501void usb_wwan_port_remove(struct usb_serial_port *port)
502{
503 int i;
504 struct usb_wwan_port_private *portdata;
505
506 portdata = usb_get_serial_port_data(port);
507 usb_set_serial_port_data(port, NULL);
508
509 for (i = 0; i < N_IN_URB; i++) {
510 usb_free_urb(portdata->in_urbs[i]);
511 free_page((unsigned long)portdata->in_buffer[i]);
512 }
513 for (i = 0; i < N_OUT_URB; i++) {
514 usb_free_urb(portdata->out_urbs[i]);
515 kfree(portdata->out_buffer[i]);
516 }
517
518 kfree(portdata);
519}
520EXPORT_SYMBOL(usb_wwan_port_remove);
521
522#ifdef CONFIG_PM
523static void stop_urbs(struct usb_serial *serial)
524{
525 int i, j;
526 struct usb_serial_port *port;
527 struct usb_wwan_port_private *portdata;
528
529 for (i = 0; i < serial->num_ports; ++i) {
530 port = serial->port[i];
531 portdata = usb_get_serial_port_data(port);
532 if (!portdata)
533 continue;
534 for (j = 0; j < N_IN_URB; j++)
535 usb_kill_urb(portdata->in_urbs[j]);
536 for (j = 0; j < N_OUT_URB; j++)
537 usb_kill_urb(portdata->out_urbs[j]);
538 usb_kill_urb(port->interrupt_in_urb);
539 }
540}
541
542int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
543{
544 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
545
546 spin_lock_irq(&intfdata->susp_lock);
547 if (PMSG_IS_AUTO(message)) {
548 if (intfdata->in_flight) {
549 spin_unlock_irq(&intfdata->susp_lock);
550 return -EBUSY;
551 }
552 }
553 intfdata->suspended = 1;
554 spin_unlock_irq(&intfdata->susp_lock);
555
556 stop_urbs(serial);
557
558 return 0;
559}
560EXPORT_SYMBOL(usb_wwan_suspend);
561
562
563static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port)
564{
565 struct usb_serial *serial = port->serial;
566 struct usb_wwan_intf_private *data = usb_get_serial_data(serial);
567 struct usb_wwan_port_private *portdata;
568 struct urb *urb;
569 int err_count = 0;
570 int err;
571
572 portdata = usb_get_serial_port_data(port);
573
574 for (;;) {
575 urb = usb_get_from_anchor(&portdata->delayed);
576 if (!urb)
577 break;
578
579 err = usb_submit_urb(urb, GFP_ATOMIC);
580 if (err) {
581 dev_err(&port->dev, "%s: submit urb failed: %d\n",
582 __func__, err);
583 err_count++;
584 unbusy_queued_urb(urb, portdata);
585 usb_autopm_put_interface_async(serial->interface);
586 continue;
587 }
588 data->in_flight++;
589 }
590
591 if (err_count)
592 return -EIO;
593
594 return 0;
595}
596
597int usb_wwan_resume(struct usb_serial *serial)
598{
599 int i, j;
600 struct usb_serial_port *port;
601 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
602 struct usb_wwan_port_private *portdata;
603 struct urb *urb;
604 int err;
605 int err_count = 0;
606
607 spin_lock_irq(&intfdata->susp_lock);
608 for (i = 0; i < serial->num_ports; i++) {
609 port = serial->port[i];
610
611 if (!tty_port_initialized(&port->port))
612 continue;
613
614 portdata = usb_get_serial_port_data(port);
615
616 if (port->interrupt_in_urb) {
617 err = usb_submit_urb(port->interrupt_in_urb,
618 GFP_ATOMIC);
619 if (err) {
620 dev_err(&port->dev,
621 "%s: submit int urb failed: %d\n",
622 __func__, err);
623 err_count++;
624 }
625 }
626
627 err = usb_wwan_submit_delayed_urbs(port);
628 if (err)
629 err_count++;
630
631 for (j = 0; j < N_IN_URB; j++) {
632 urb = portdata->in_urbs[j];
633 err = usb_submit_urb(urb, GFP_ATOMIC);
634 if (err < 0) {
635 dev_err(&port->dev,
636 "%s: submit read urb %d failed: %d\n",
637 __func__, i, err);
638 err_count++;
639 }
640 }
641 }
642 intfdata->suspended = 0;
643 spin_unlock_irq(&intfdata->susp_lock);
644
645 if (err_count)
646 return -EIO;
647
648 return 0;
649}
650EXPORT_SYMBOL(usb_wwan_resume);
651#endif
652
653MODULE_AUTHOR(DRIVER_AUTHOR);
654MODULE_DESCRIPTION(DRIVER_DESC);
655MODULE_LICENSE("GPL v2");
656
