/drivers/isdn/gigaset/bas-gigaset.c
C | 2657 lines | 1921 code | 275 blank | 461 comment | 267 complexity | 3983f5f734c9ecaf9102d8ce2f8cdbd4 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
1/*
2 * USB driver for Gigaset 307x base via direct USB connection.
3 *
4 * Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
5 * Tilman Schmidt <tilman@imap.cc>,
6 * Stefan Eilers.
7 *
8 * =====================================================================
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
13 * =====================================================================
14 */
15
16#include "gigaset.h"
17#include <linux/usb.h>
18#include <linux/module.h>
19#include <linux/moduleparam.h>
20
21/* Version Information */
22#define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
23#define DRIVER_DESC "USB Driver for Gigaset 307x"
24
25
26/* Module parameters */
27
28static int startmode = SM_ISDN;
29static int cidmode = 1;
30
31module_param(startmode, int, S_IRUGO);
32module_param(cidmode, int, S_IRUGO);
33MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
34MODULE_PARM_DESC(cidmode, "Call-ID mode");
35
36#define GIGASET_MINORS 1
37#define GIGASET_MINOR 16
38#define GIGASET_MODULENAME "bas_gigaset"
39#define GIGASET_DEVNAME "ttyGB"
40
41/* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
42#define IF_WRITEBUF 264
43
44/* interrupt pipe message size according to ibid. ch. 2.2 */
45#define IP_MSGSIZE 3
46
47/* Values for the Gigaset 307x */
48#define USB_GIGA_VENDOR_ID 0x0681
49#define USB_3070_PRODUCT_ID 0x0001
50#define USB_3075_PRODUCT_ID 0x0002
51#define USB_SX303_PRODUCT_ID 0x0021
52#define USB_SX353_PRODUCT_ID 0x0022
53
54/* table of devices that work with this driver */
55static const struct usb_device_id gigaset_table[] = {
56 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
57 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
58 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
59 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
60 { } /* Terminating entry */
61};
62
63MODULE_DEVICE_TABLE(usb, gigaset_table);
64
65/*======================= local function prototypes ==========================*/
66
67/* function called if a new device belonging to this driver is connected */
68static int gigaset_probe(struct usb_interface *interface,
69 const struct usb_device_id *id);
70
71/* Function will be called if the device is unplugged */
72static void gigaset_disconnect(struct usb_interface *interface);
73
74/* functions called before/after suspend */
75static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
76static int gigaset_resume(struct usb_interface *intf);
77
78/* functions called before/after device reset */
79static int gigaset_pre_reset(struct usb_interface *intf);
80static int gigaset_post_reset(struct usb_interface *intf);
81
82static int atread_submit(struct cardstate *, int);
83static void stopurbs(struct bas_bc_state *);
84static int req_submit(struct bc_state *, int, int, int);
85static int atwrite_submit(struct cardstate *, unsigned char *, int);
86static int start_cbsend(struct cardstate *);
87
88/*============================================================================*/
89
90struct bas_cardstate {
91 struct usb_device *udev; /* USB device pointer */
92 struct usb_interface *interface; /* interface for this device */
93 unsigned char minor; /* starting minor number */
94
95 struct urb *urb_ctrl; /* control pipe default URB */
96 struct usb_ctrlrequest dr_ctrl;
97 struct timer_list timer_ctrl; /* control request timeout */
98 int retry_ctrl;
99
100 struct timer_list timer_atrdy; /* AT command ready timeout */
101 struct urb *urb_cmd_out; /* for sending AT commands */
102 struct usb_ctrlrequest dr_cmd_out;
103 int retry_cmd_out;
104
105 struct urb *urb_cmd_in; /* for receiving AT replies */
106 struct usb_ctrlrequest dr_cmd_in;
107 struct timer_list timer_cmd_in; /* receive request timeout */
108 unsigned char *rcvbuf; /* AT reply receive buffer */
109
110 struct urb *urb_int_in; /* URB for interrupt pipe */
111 unsigned char *int_in_buf;
112 struct work_struct int_in_wq; /* for usb_clear_halt() */
113 struct timer_list timer_int_in; /* int read retry delay */
114 int retry_int_in;
115
116 spinlock_t lock; /* locks all following */
117 int basstate; /* bitmap (BS_*) */
118 int pending; /* uncompleted base request */
119 wait_queue_head_t waitqueue;
120 int rcvbuf_size; /* size of AT receive buffer */
121 /* 0: no receive in progress */
122 int retry_cmd_in; /* receive req retry count */
123};
124
125/* status of direct USB connection to 307x base (bits in basstate) */
126#define BS_ATOPEN 0x001 /* AT channel open */
127#define BS_B1OPEN 0x002 /* B channel 1 open */
128#define BS_B2OPEN 0x004 /* B channel 2 open */
129#define BS_ATREADY 0x008 /* base ready for AT command */
130#define BS_INIT 0x010 /* base has signalled INIT_OK */
131#define BS_ATTIMER 0x020 /* waiting for HD_READY_SEND_ATDATA */
132#define BS_ATRDPEND 0x040 /* urb_cmd_in in use */
133#define BS_ATWRPEND 0x080 /* urb_cmd_out in use */
134#define BS_SUSPEND 0x100 /* USB port suspended */
135#define BS_RESETTING 0x200 /* waiting for HD_RESET_INTERRUPT_PIPE_ACK */
136
137
138static struct gigaset_driver *driver;
139
140/* usb specific object needed to register this driver with the usb subsystem */
141static struct usb_driver gigaset_usb_driver = {
142 .name = GIGASET_MODULENAME,
143 .probe = gigaset_probe,
144 .disconnect = gigaset_disconnect,
145 .id_table = gigaset_table,
146 .suspend = gigaset_suspend,
147 .resume = gigaset_resume,
148 .reset_resume = gigaset_post_reset,
149 .pre_reset = gigaset_pre_reset,
150 .post_reset = gigaset_post_reset,
151};
152
153/* get message text for usb_submit_urb return code
154 */
155static char *get_usb_rcmsg(int rc)
156{
157 static char unkmsg[28];
158
159 switch (rc) {
160 case 0:
161 return "success";
162 case -ENOMEM:
163 return "out of memory";
164 case -ENODEV:
165 return "device not present";
166 case -ENOENT:
167 return "endpoint not present";
168 case -ENXIO:
169 return "URB type not supported";
170 case -EINVAL:
171 return "invalid argument";
172 case -EAGAIN:
173 return "start frame too early or too much scheduled";
174 case -EFBIG:
175 return "too many isoc frames requested";
176 case -EPIPE:
177 return "endpoint stalled";
178 case -EMSGSIZE:
179 return "invalid packet size";
180 case -ENOSPC:
181 return "would overcommit USB bandwidth";
182 case -ESHUTDOWN:
183 return "device shut down";
184 case -EPERM:
185 return "reject flag set";
186 case -EHOSTUNREACH:
187 return "device suspended";
188 default:
189 snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
190 return unkmsg;
191 }
192}
193
194/* get message text for USB status code
195 */
196static char *get_usb_statmsg(int status)
197{
198 static char unkmsg[28];
199
200 switch (status) {
201 case 0:
202 return "success";
203 case -ENOENT:
204 return "unlinked (sync)";
205 case -EINPROGRESS:
206 return "URB still pending";
207 case -EPROTO:
208 return "bitstuff error, timeout, or unknown USB error";
209 case -EILSEQ:
210 return "CRC mismatch, timeout, or unknown USB error";
211 case -ETIME:
212 return "USB response timeout";
213 case -EPIPE:
214 return "endpoint stalled";
215 case -ECOMM:
216 return "IN buffer overrun";
217 case -ENOSR:
218 return "OUT buffer underrun";
219 case -EOVERFLOW:
220 return "endpoint babble";
221 case -EREMOTEIO:
222 return "short packet";
223 case -ENODEV:
224 return "device removed";
225 case -EXDEV:
226 return "partial isoc transfer";
227 case -EINVAL:
228 return "ISO madness";
229 case -ECONNRESET:
230 return "unlinked (async)";
231 case -ESHUTDOWN:
232 return "device shut down";
233 default:
234 snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
235 return unkmsg;
236 }
237}
238
239/* usb_pipetype_str
240 * retrieve string representation of USB pipe type
241 */
242static inline char *usb_pipetype_str(int pipe)
243{
244 if (usb_pipeisoc(pipe))
245 return "Isoc";
246 if (usb_pipeint(pipe))
247 return "Int";
248 if (usb_pipecontrol(pipe))
249 return "Ctrl";
250 if (usb_pipebulk(pipe))
251 return "Bulk";
252 return "?";
253}
254
255/* dump_urb
256 * write content of URB to syslog for debugging
257 */
258static inline void dump_urb(enum debuglevel level, const char *tag,
259 struct urb *urb)
260{
261#ifdef CONFIG_GIGASET_DEBUG
262 int i;
263 gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
264 if (urb) {
265 gig_dbg(level,
266 " dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
267 "hcpriv=0x%08lx, transfer_flags=0x%x,",
268 (unsigned long) urb->dev,
269 usb_pipetype_str(urb->pipe),
270 usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
271 usb_pipein(urb->pipe) ? "in" : "out",
272 (unsigned long) urb->hcpriv,
273 urb->transfer_flags);
274 gig_dbg(level,
275 " transfer_buffer=0x%08lx[%d], actual_length=%d, "
276 "setup_packet=0x%08lx,",
277 (unsigned long) urb->transfer_buffer,
278 urb->transfer_buffer_length, urb->actual_length,
279 (unsigned long) urb->setup_packet);
280 gig_dbg(level,
281 " start_frame=%d, number_of_packets=%d, interval=%d, "
282 "error_count=%d,",
283 urb->start_frame, urb->number_of_packets, urb->interval,
284 urb->error_count);
285 gig_dbg(level,
286 " context=0x%08lx, complete=0x%08lx, "
287 "iso_frame_desc[]={",
288 (unsigned long) urb->context,
289 (unsigned long) urb->complete);
290 for (i = 0; i < urb->number_of_packets; i++) {
291 struct usb_iso_packet_descriptor *pifd
292 = &urb->iso_frame_desc[i];
293 gig_dbg(level,
294 " {offset=%u, length=%u, actual_length=%u, "
295 "status=%u}",
296 pifd->offset, pifd->length, pifd->actual_length,
297 pifd->status);
298 }
299 }
300 gig_dbg(level, "}}");
301#endif
302}
303
304/* read/set modem control bits etc. (m10x only) */
305static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
306 unsigned new_state)
307{
308 return -EINVAL;
309}
310
311static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
312{
313 return -EINVAL;
314}
315
316static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
317{
318 return -EINVAL;
319}
320
321/* set/clear bits in base connection state, return previous state
322 */
323static inline int update_basstate(struct bas_cardstate *ucs,
324 int set, int clear)
325{
326 unsigned long flags;
327 int state;
328
329 spin_lock_irqsave(&ucs->lock, flags);
330 state = ucs->basstate;
331 ucs->basstate = (state & ~clear) | set;
332 spin_unlock_irqrestore(&ucs->lock, flags);
333 return state;
334}
335
336/* error_hangup
337 * hang up any existing connection because of an unrecoverable error
338 * This function may be called from any context and takes care of scheduling
339 * the necessary actions for execution outside of interrupt context.
340 * cs->lock must not be held.
341 * argument:
342 * B channel control structure
343 */
344static inline void error_hangup(struct bc_state *bcs)
345{
346 struct cardstate *cs = bcs->cs;
347
348 gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL);
349 gigaset_schedule_event(cs);
350}
351
352/* error_reset
353 * reset Gigaset device because of an unrecoverable error
354 * This function may be called from any context, and takes care of
355 * scheduling the necessary actions for execution outside of interrupt context.
356 * cs->hw.bas->lock must not be held.
357 * argument:
358 * controller state structure
359 */
360static inline void error_reset(struct cardstate *cs)
361{
362 /* reset interrupt pipe to recover (ignore errors) */
363 update_basstate(cs->hw.bas, BS_RESETTING, 0);
364 if (req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT))
365 /* submission failed, escalate to USB port reset */
366 usb_queue_reset_device(cs->hw.bas->interface);
367}
368
369/* check_pending
370 * check for completion of pending control request
371 * parameter:
372 * ucs hardware specific controller state structure
373 */
374static void check_pending(struct bas_cardstate *ucs)
375{
376 unsigned long flags;
377
378 spin_lock_irqsave(&ucs->lock, flags);
379 switch (ucs->pending) {
380 case 0:
381 break;
382 case HD_OPEN_ATCHANNEL:
383 if (ucs->basstate & BS_ATOPEN)
384 ucs->pending = 0;
385 break;
386 case HD_OPEN_B1CHANNEL:
387 if (ucs->basstate & BS_B1OPEN)
388 ucs->pending = 0;
389 break;
390 case HD_OPEN_B2CHANNEL:
391 if (ucs->basstate & BS_B2OPEN)
392 ucs->pending = 0;
393 break;
394 case HD_CLOSE_ATCHANNEL:
395 if (!(ucs->basstate & BS_ATOPEN))
396 ucs->pending = 0;
397 break;
398 case HD_CLOSE_B1CHANNEL:
399 if (!(ucs->basstate & BS_B1OPEN))
400 ucs->pending = 0;
401 break;
402 case HD_CLOSE_B2CHANNEL:
403 if (!(ucs->basstate & BS_B2OPEN))
404 ucs->pending = 0;
405 break;
406 case HD_DEVICE_INIT_ACK: /* no reply expected */
407 ucs->pending = 0;
408 break;
409 case HD_RESET_INTERRUPT_PIPE:
410 if (!(ucs->basstate & BS_RESETTING))
411 ucs->pending = 0;
412 break;
413 /*
414 * HD_READ_ATMESSAGE and HD_WRITE_ATMESSAGE are handled separately
415 * and should never end up here
416 */
417 default:
418 dev_warn(&ucs->interface->dev,
419 "unknown pending request 0x%02x cleared\n",
420 ucs->pending);
421 ucs->pending = 0;
422 }
423
424 if (!ucs->pending)
425 del_timer(&ucs->timer_ctrl);
426
427 spin_unlock_irqrestore(&ucs->lock, flags);
428}
429
430/* cmd_in_timeout
431 * timeout routine for command input request
432 * argument:
433 * controller state structure
434 */
435static void cmd_in_timeout(unsigned long data)
436{
437 struct cardstate *cs = (struct cardstate *) data;
438 struct bas_cardstate *ucs = cs->hw.bas;
439 int rc;
440
441 if (!ucs->rcvbuf_size) {
442 gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
443 return;
444 }
445
446 if (ucs->retry_cmd_in++ >= BAS_RETRY) {
447 dev_err(cs->dev,
448 "control read: timeout, giving up after %d tries\n",
449 ucs->retry_cmd_in);
450 kfree(ucs->rcvbuf);
451 ucs->rcvbuf = NULL;
452 ucs->rcvbuf_size = 0;
453 error_reset(cs);
454 return;
455 }
456
457 gig_dbg(DEBUG_USBREQ, "%s: timeout, retry %d",
458 __func__, ucs->retry_cmd_in);
459 rc = atread_submit(cs, BAS_TIMEOUT);
460 if (rc < 0) {
461 kfree(ucs->rcvbuf);
462 ucs->rcvbuf = NULL;
463 ucs->rcvbuf_size = 0;
464 if (rc != -ENODEV)
465 error_reset(cs);
466 }
467}
468
469/* read_ctrl_callback
470 * USB completion handler for control pipe input
471 * called by the USB subsystem in interrupt context
472 * parameter:
473 * urb USB request block
474 * urb->context = inbuf structure for controller state
475 */
476static void read_ctrl_callback(struct urb *urb)
477{
478 struct inbuf_t *inbuf = urb->context;
479 struct cardstate *cs = inbuf->cs;
480 struct bas_cardstate *ucs = cs->hw.bas;
481 int status = urb->status;
482 unsigned numbytes;
483 int rc;
484
485 update_basstate(ucs, 0, BS_ATRDPEND);
486 wake_up(&ucs->waitqueue);
487 del_timer(&ucs->timer_cmd_in);
488
489 switch (status) {
490 case 0: /* normal completion */
491 numbytes = urb->actual_length;
492 if (unlikely(numbytes != ucs->rcvbuf_size)) {
493 dev_warn(cs->dev,
494 "control read: received %d chars, expected %d\n",
495 numbytes, ucs->rcvbuf_size);
496 if (numbytes > ucs->rcvbuf_size)
497 numbytes = ucs->rcvbuf_size;
498 }
499
500 /* copy received bytes to inbuf, notify event layer */
501 if (gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes)) {
502 gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
503 gigaset_schedule_event(cs);
504 }
505 break;
506
507 case -ENOENT: /* cancelled */
508 case -ECONNRESET: /* cancelled (async) */
509 case -EINPROGRESS: /* pending */
510 case -ENODEV: /* device removed */
511 case -ESHUTDOWN: /* device shut down */
512 /* no further action necessary */
513 gig_dbg(DEBUG_USBREQ, "%s: %s",
514 __func__, get_usb_statmsg(status));
515 break;
516
517 default: /* other errors: retry */
518 if (ucs->retry_cmd_in++ < BAS_RETRY) {
519 gig_dbg(DEBUG_USBREQ, "%s: %s, retry %d", __func__,
520 get_usb_statmsg(status), ucs->retry_cmd_in);
521 rc = atread_submit(cs, BAS_TIMEOUT);
522 if (rc >= 0)
523 /* successfully resubmitted, skip freeing */
524 return;
525 if (rc == -ENODEV)
526 /* disconnect, no further action necessary */
527 break;
528 }
529 dev_err(cs->dev, "control read: %s, giving up after %d tries\n",
530 get_usb_statmsg(status), ucs->retry_cmd_in);
531 error_reset(cs);
532 }
533
534 /* read finished, free buffer */
535 kfree(ucs->rcvbuf);
536 ucs->rcvbuf = NULL;
537 ucs->rcvbuf_size = 0;
538}
539
540/* atread_submit
541 * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
542 * parameters:
543 * cs controller state structure
544 * timeout timeout in 1/10 sec., 0: none
545 * return value:
546 * 0 on success
547 * -EBUSY if another request is pending
548 * any URB submission error code
549 */
550static int atread_submit(struct cardstate *cs, int timeout)
551{
552 struct bas_cardstate *ucs = cs->hw.bas;
553 int basstate;
554 int ret;
555
556 gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
557 ucs->rcvbuf_size);
558
559 basstate = update_basstate(ucs, BS_ATRDPEND, 0);
560 if (basstate & BS_ATRDPEND) {
561 dev_err(cs->dev,
562 "could not submit HD_READ_ATMESSAGE: URB busy\n");
563 return -EBUSY;
564 }
565
566 if (basstate & BS_SUSPEND) {
567 dev_notice(cs->dev,
568 "HD_READ_ATMESSAGE not submitted, "
569 "suspend in progress\n");
570 update_basstate(ucs, 0, BS_ATRDPEND);
571 /* treat like disconnect */
572 return -ENODEV;
573 }
574
575 ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
576 ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
577 ucs->dr_cmd_in.wValue = 0;
578 ucs->dr_cmd_in.wIndex = 0;
579 ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
580 usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
581 usb_rcvctrlpipe(ucs->udev, 0),
582 (unsigned char *) &ucs->dr_cmd_in,
583 ucs->rcvbuf, ucs->rcvbuf_size,
584 read_ctrl_callback, cs->inbuf);
585
586 ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC);
587 if (ret != 0) {
588 update_basstate(ucs, 0, BS_ATRDPEND);
589 dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
590 get_usb_rcmsg(ret));
591 return ret;
592 }
593
594 if (timeout > 0) {
595 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
596 mod_timer(&ucs->timer_cmd_in, jiffies + timeout * HZ / 10);
597 }
598 return 0;
599}
600
601/* int_in_work
602 * workqueue routine to clear halt on interrupt in endpoint
603 */
604
605static void int_in_work(struct work_struct *work)
606{
607 struct bas_cardstate *ucs =
608 container_of(work, struct bas_cardstate, int_in_wq);
609 struct urb *urb = ucs->urb_int_in;
610 struct cardstate *cs = urb->context;
611 int rc;
612
613 /* clear halt condition */
614 rc = usb_clear_halt(ucs->udev, urb->pipe);
615 gig_dbg(DEBUG_USBREQ, "clear_halt: %s", get_usb_rcmsg(rc));
616 if (rc == 0)
617 /* success, resubmit interrupt read URB */
618 rc = usb_submit_urb(urb, GFP_ATOMIC);
619 if (rc != 0 && rc != -ENODEV) {
620 dev_err(cs->dev, "clear halt failed: %s\n", get_usb_rcmsg(rc));
621 rc = usb_lock_device_for_reset(ucs->udev, ucs->interface);
622 if (rc == 0) {
623 rc = usb_reset_device(ucs->udev);
624 usb_unlock_device(ucs->udev);
625 }
626 }
627 ucs->retry_int_in = 0;
628}
629
630/* int_in_resubmit
631 * timer routine for interrupt read delayed resubmit
632 * argument:
633 * controller state structure
634 */
635static void int_in_resubmit(unsigned long data)
636{
637 struct cardstate *cs = (struct cardstate *) data;
638 struct bas_cardstate *ucs = cs->hw.bas;
639 int rc;
640
641 if (ucs->retry_int_in++ >= BAS_RETRY) {
642 dev_err(cs->dev, "interrupt read: giving up after %d tries\n",
643 ucs->retry_int_in);
644 usb_queue_reset_device(ucs->interface);
645 return;
646 }
647
648 gig_dbg(DEBUG_USBREQ, "%s: retry %d", __func__, ucs->retry_int_in);
649 rc = usb_submit_urb(ucs->urb_int_in, GFP_ATOMIC);
650 if (rc != 0 && rc != -ENODEV) {
651 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
652 get_usb_rcmsg(rc));
653 usb_queue_reset_device(ucs->interface);
654 }
655}
656
657/* read_int_callback
658 * USB completion handler for interrupt pipe input
659 * called by the USB subsystem in interrupt context
660 * parameter:
661 * urb USB request block
662 * urb->context = controller state structure
663 */
664static void read_int_callback(struct urb *urb)
665{
666 struct cardstate *cs = urb->context;
667 struct bas_cardstate *ucs = cs->hw.bas;
668 struct bc_state *bcs;
669 int status = urb->status;
670 unsigned long flags;
671 int rc;
672 unsigned l;
673 int channel;
674
675 switch (status) {
676 case 0: /* success */
677 ucs->retry_int_in = 0;
678 break;
679 case -EPIPE: /* endpoint stalled */
680 schedule_work(&ucs->int_in_wq);
681 /* fall through */
682 case -ENOENT: /* cancelled */
683 case -ECONNRESET: /* cancelled (async) */
684 case -EINPROGRESS: /* pending */
685 case -ENODEV: /* device removed */
686 case -ESHUTDOWN: /* device shut down */
687 /* no further action necessary */
688 gig_dbg(DEBUG_USBREQ, "%s: %s",
689 __func__, get_usb_statmsg(status));
690 return;
691 case -EPROTO: /* protocol error or unplug */
692 case -EILSEQ:
693 case -ETIME:
694 /* resubmit after delay */
695 gig_dbg(DEBUG_USBREQ, "%s: %s",
696 __func__, get_usb_statmsg(status));
697 mod_timer(&ucs->timer_int_in, jiffies + HZ / 10);
698 return;
699 default: /* other errors: just resubmit */
700 dev_warn(cs->dev, "interrupt read: %s\n",
701 get_usb_statmsg(status));
702 goto resubmit;
703 }
704
705 /* drop incomplete packets even if the missing bytes wouldn't matter */
706 if (unlikely(urb->actual_length < IP_MSGSIZE)) {
707 dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
708 urb->actual_length);
709 goto resubmit;
710 }
711
712 l = (unsigned) ucs->int_in_buf[1] +
713 (((unsigned) ucs->int_in_buf[2]) << 8);
714
715 gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
716 urb->actual_length, (int)ucs->int_in_buf[0], l,
717 (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
718
719 channel = 0;
720
721 switch (ucs->int_in_buf[0]) {
722 case HD_DEVICE_INIT_OK:
723 update_basstate(ucs, BS_INIT, 0);
724 break;
725
726 case HD_READY_SEND_ATDATA:
727 del_timer(&ucs->timer_atrdy);
728 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
729 start_cbsend(cs);
730 break;
731
732 case HD_OPEN_B2CHANNEL_ACK:
733 ++channel;
734 case HD_OPEN_B1CHANNEL_ACK:
735 bcs = cs->bcs + channel;
736 update_basstate(ucs, BS_B1OPEN << channel, 0);
737 gigaset_bchannel_up(bcs);
738 break;
739
740 case HD_OPEN_ATCHANNEL_ACK:
741 update_basstate(ucs, BS_ATOPEN, 0);
742 start_cbsend(cs);
743 break;
744
745 case HD_CLOSE_B2CHANNEL_ACK:
746 ++channel;
747 case HD_CLOSE_B1CHANNEL_ACK:
748 bcs = cs->bcs + channel;
749 update_basstate(ucs, 0, BS_B1OPEN << channel);
750 stopurbs(bcs->hw.bas);
751 gigaset_bchannel_down(bcs);
752 break;
753
754 case HD_CLOSE_ATCHANNEL_ACK:
755 update_basstate(ucs, 0, BS_ATOPEN);
756 break;
757
758 case HD_B2_FLOW_CONTROL:
759 ++channel;
760 case HD_B1_FLOW_CONTROL:
761 bcs = cs->bcs + channel;
762 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
763 &bcs->hw.bas->corrbytes);
764 gig_dbg(DEBUG_ISO,
765 "Flow control (channel %d, sub %d): 0x%02x => %d",
766 channel, bcs->hw.bas->numsub, l,
767 atomic_read(&bcs->hw.bas->corrbytes));
768 break;
769
770 case HD_RECEIVEATDATA_ACK: /* AT response ready to be received */
771 if (!l) {
772 dev_warn(cs->dev,
773 "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
774 break;
775 }
776 spin_lock_irqsave(&cs->lock, flags);
777 if (ucs->basstate & BS_ATRDPEND) {
778 spin_unlock_irqrestore(&cs->lock, flags);
779 dev_warn(cs->dev,
780 "HD_RECEIVEATDATA_ACK(%d) during HD_READ_ATMESSAGE(%d) ignored\n",
781 l, ucs->rcvbuf_size);
782 break;
783 }
784 if (ucs->rcvbuf_size) {
785 /* throw away previous buffer - we have no queue */
786 dev_err(cs->dev,
787 "receive AT data overrun, %d bytes lost\n",
788 ucs->rcvbuf_size);
789 kfree(ucs->rcvbuf);
790 ucs->rcvbuf_size = 0;
791 }
792 ucs->rcvbuf = kmalloc(l, GFP_ATOMIC);
793 if (ucs->rcvbuf == NULL) {
794 spin_unlock_irqrestore(&cs->lock, flags);
795 dev_err(cs->dev, "out of memory receiving AT data\n");
796 break;
797 }
798 ucs->rcvbuf_size = l;
799 ucs->retry_cmd_in = 0;
800 rc = atread_submit(cs, BAS_TIMEOUT);
801 if (rc < 0) {
802 kfree(ucs->rcvbuf);
803 ucs->rcvbuf = NULL;
804 ucs->rcvbuf_size = 0;
805 }
806 spin_unlock_irqrestore(&cs->lock, flags);
807 if (rc < 0 && rc != -ENODEV)
808 error_reset(cs);
809 break;
810
811 case HD_RESET_INTERRUPT_PIPE_ACK:
812 update_basstate(ucs, 0, BS_RESETTING);
813 dev_notice(cs->dev, "interrupt pipe reset\n");
814 break;
815
816 case HD_SUSPEND_END:
817 gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
818 break;
819
820 default:
821 dev_warn(cs->dev,
822 "unknown Gigaset signal 0x%02x (%u) ignored\n",
823 (int) ucs->int_in_buf[0], l);
824 }
825
826 check_pending(ucs);
827 wake_up(&ucs->waitqueue);
828
829resubmit:
830 rc = usb_submit_urb(urb, GFP_ATOMIC);
831 if (unlikely(rc != 0 && rc != -ENODEV)) {
832 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
833 get_usb_rcmsg(rc));
834 error_reset(cs);
835 }
836}
837
838/* read_iso_callback
839 * USB completion handler for B channel isochronous input
840 * called by the USB subsystem in interrupt context
841 * parameter:
842 * urb USB request block of completed request
843 * urb->context = bc_state structure
844 */
845static void read_iso_callback(struct urb *urb)
846{
847 struct bc_state *bcs;
848 struct bas_bc_state *ubc;
849 int status = urb->status;
850 unsigned long flags;
851 int i, rc;
852
853 /* status codes not worth bothering the tasklet with */
854 if (unlikely(status == -ENOENT ||
855 status == -ECONNRESET ||
856 status == -EINPROGRESS ||
857 status == -ENODEV ||
858 status == -ESHUTDOWN)) {
859 gig_dbg(DEBUG_ISO, "%s: %s",
860 __func__, get_usb_statmsg(status));
861 return;
862 }
863
864 bcs = urb->context;
865 ubc = bcs->hw.bas;
866
867 spin_lock_irqsave(&ubc->isoinlock, flags);
868 if (likely(ubc->isoindone == NULL)) {
869 /* pass URB to tasklet */
870 ubc->isoindone = urb;
871 ubc->isoinstatus = status;
872 tasklet_hi_schedule(&ubc->rcvd_tasklet);
873 } else {
874 /* tasklet still busy, drop data and resubmit URB */
875 gig_dbg(DEBUG_ISO, "%s: overrun", __func__);
876 ubc->loststatus = status;
877 for (i = 0; i < BAS_NUMFRAMES; i++) {
878 ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
879 if (unlikely(urb->iso_frame_desc[i].status != 0 &&
880 urb->iso_frame_desc[i].status !=
881 -EINPROGRESS))
882 ubc->loststatus = urb->iso_frame_desc[i].status;
883 urb->iso_frame_desc[i].status = 0;
884 urb->iso_frame_desc[i].actual_length = 0;
885 }
886 if (likely(ubc->running)) {
887 /* urb->dev is clobbered by USB subsystem */
888 urb->dev = bcs->cs->hw.bas->udev;
889 urb->transfer_flags = URB_ISO_ASAP;
890 urb->number_of_packets = BAS_NUMFRAMES;
891 rc = usb_submit_urb(urb, GFP_ATOMIC);
892 if (unlikely(rc != 0 && rc != -ENODEV)) {
893 dev_err(bcs->cs->dev,
894 "could not resubmit isoc read URB: %s\n",
895 get_usb_rcmsg(rc));
896 dump_urb(DEBUG_ISO, "isoc read", urb);
897 error_hangup(bcs);
898 }
899 }
900 }
901 spin_unlock_irqrestore(&ubc->isoinlock, flags);
902}
903
904/* write_iso_callback
905 * USB completion handler for B channel isochronous output
906 * called by the USB subsystem in interrupt context
907 * parameter:
908 * urb USB request block of completed request
909 * urb->context = isow_urbctx_t structure
910 */
911static void write_iso_callback(struct urb *urb)
912{
913 struct isow_urbctx_t *ucx;
914 struct bas_bc_state *ubc;
915 int status = urb->status;
916 unsigned long flags;
917
918 /* status codes not worth bothering the tasklet with */
919 if (unlikely(status == -ENOENT ||
920 status == -ECONNRESET ||
921 status == -EINPROGRESS ||
922 status == -ENODEV ||
923 status == -ESHUTDOWN)) {
924 gig_dbg(DEBUG_ISO, "%s: %s",
925 __func__, get_usb_statmsg(status));
926 return;
927 }
928
929 /* pass URB context to tasklet */
930 ucx = urb->context;
931 ubc = ucx->bcs->hw.bas;
932 ucx->status = status;
933
934 spin_lock_irqsave(&ubc->isooutlock, flags);
935 ubc->isooutovfl = ubc->isooutdone;
936 ubc->isooutdone = ucx;
937 spin_unlock_irqrestore(&ubc->isooutlock, flags);
938 tasklet_hi_schedule(&ubc->sent_tasklet);
939}
940
941/* starturbs
942 * prepare and submit USB request blocks for isochronous input and output
943 * argument:
944 * B channel control structure
945 * return value:
946 * 0 on success
947 * < 0 on error (no URBs submitted)
948 */
949static int starturbs(struct bc_state *bcs)
950{
951 struct bas_bc_state *ubc = bcs->hw.bas;
952 struct urb *urb;
953 int j, k;
954 int rc;
955
956 /* initialize L2 reception */
957 if (bcs->proto2 == L2_HDLC)
958 bcs->inputstate |= INS_flag_hunt;
959
960 /* submit all isochronous input URBs */
961 ubc->running = 1;
962 for (k = 0; k < BAS_INURBS; k++) {
963 urb = ubc->isoinurbs[k];
964 if (!urb) {
965 rc = -EFAULT;
966 goto error;
967 }
968
969 urb->dev = bcs->cs->hw.bas->udev;
970 urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
971 urb->transfer_flags = URB_ISO_ASAP;
972 urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
973 urb->transfer_buffer_length = BAS_INBUFSIZE;
974 urb->number_of_packets = BAS_NUMFRAMES;
975 urb->interval = BAS_FRAMETIME;
976 urb->complete = read_iso_callback;
977 urb->context = bcs;
978 for (j = 0; j < BAS_NUMFRAMES; j++) {
979 urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
980 urb->iso_frame_desc[j].length = BAS_MAXFRAME;
981 urb->iso_frame_desc[j].status = 0;
982 urb->iso_frame_desc[j].actual_length = 0;
983 }
984
985 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
986 rc = usb_submit_urb(urb, GFP_ATOMIC);
987 if (rc != 0)
988 goto error;
989 }
990
991 /* initialize L2 transmission */
992 gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
993
994 /* set up isochronous output URBs for flag idling */
995 for (k = 0; k < BAS_OUTURBS; ++k) {
996 urb = ubc->isoouturbs[k].urb;
997 if (!urb) {
998 rc = -EFAULT;
999 goto error;
1000 }
1001 urb->dev = bcs->cs->hw.bas->udev;
1002 urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
1003 urb->transfer_flags = URB_ISO_ASAP;
1004 urb->transfer_buffer = ubc->isooutbuf->data;
1005 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1006 urb->number_of_packets = BAS_NUMFRAMES;
1007 urb->interval = BAS_FRAMETIME;
1008 urb->complete = write_iso_callback;
1009 urb->context = &ubc->isoouturbs[k];
1010 for (j = 0; j < BAS_NUMFRAMES; ++j) {
1011 urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
1012 urb->iso_frame_desc[j].length = BAS_NORMFRAME;
1013 urb->iso_frame_desc[j].status = 0;
1014 urb->iso_frame_desc[j].actual_length = 0;
1015 }
1016 ubc->isoouturbs[k].limit = -1;
1017 }
1018
1019 /* keep one URB free, submit the others */
1020 for (k = 0; k < BAS_OUTURBS-1; ++k) {
1021 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
1022 rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
1023 if (rc != 0)
1024 goto error;
1025 }
1026 dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
1027 ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS-1];
1028 ubc->isooutdone = ubc->isooutovfl = NULL;
1029 return 0;
1030 error:
1031 stopurbs(ubc);
1032 return rc;
1033}
1034
1035/* stopurbs
1036 * cancel the USB request blocks for isochronous input and output
1037 * errors are silently ignored
1038 * argument:
1039 * B channel control structure
1040 */
1041static void stopurbs(struct bas_bc_state *ubc)
1042{
1043 int k, rc;
1044
1045 ubc->running = 0;
1046
1047 for (k = 0; k < BAS_INURBS; ++k) {
1048 rc = usb_unlink_urb(ubc->isoinurbs[k]);
1049 gig_dbg(DEBUG_ISO,
1050 "%s: isoc input URB %d unlinked, result = %s",
1051 __func__, k, get_usb_rcmsg(rc));
1052 }
1053
1054 for (k = 0; k < BAS_OUTURBS; ++k) {
1055 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1056 gig_dbg(DEBUG_ISO,
1057 "%s: isoc output URB %d unlinked, result = %s",
1058 __func__, k, get_usb_rcmsg(rc));
1059 }
1060}
1061
1062/* Isochronous Write - Bottom Half */
1063/* =============================== */
1064
1065/* submit_iso_write_urb
1066 * fill and submit the next isochronous write URB
1067 * parameters:
1068 * ucx context structure containing URB
1069 * return value:
1070 * number of frames submitted in URB
1071 * 0 if URB not submitted because no data available (isooutbuf busy)
1072 * error code < 0 on error
1073 */
1074static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
1075{
1076 struct urb *urb = ucx->urb;
1077 struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1078 struct usb_iso_packet_descriptor *ifd;
1079 int corrbytes, nframe, rc;
1080
1081 /* urb->dev is clobbered by USB subsystem */
1082 urb->dev = ucx->bcs->cs->hw.bas->udev;
1083 urb->transfer_flags = URB_ISO_ASAP;
1084 urb->transfer_buffer = ubc->isooutbuf->data;
1085 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1086
1087 for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1088 ifd = &urb->iso_frame_desc[nframe];
1089
1090 /* compute frame length according to flow control */
1091 ifd->length = BAS_NORMFRAME;
1092 corrbytes = atomic_read(&ubc->corrbytes);
1093 if (corrbytes != 0) {
1094 gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1095 __func__, corrbytes);
1096 if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1097 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1098 else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1099 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1100 ifd->length += corrbytes;
1101 atomic_add(-corrbytes, &ubc->corrbytes);
1102 }
1103
1104 /* retrieve block of data to send */
1105 rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
1106 if (rc < 0) {
1107 if (rc == -EBUSY) {
1108 gig_dbg(DEBUG_ISO,
1109 "%s: buffer busy at frame %d",
1110 __func__, nframe);
1111 /* tasklet will be restarted from
1112 gigaset_isoc_send_skb() */
1113 } else {
1114 dev_err(ucx->bcs->cs->dev,
1115 "%s: buffer error %d at frame %d\n",
1116 __func__, rc, nframe);
1117 return rc;
1118 }
1119 break;
1120 }
1121 ifd->offset = rc;
1122 ucx->limit = ubc->isooutbuf->nextread;
1123 ifd->status = 0;
1124 ifd->actual_length = 0;
1125 }
1126 if (unlikely(nframe == 0))
1127 return 0; /* no data to send */
1128 urb->number_of_packets = nframe;
1129
1130 rc = usb_submit_urb(urb, GFP_ATOMIC);
1131 if (unlikely(rc)) {
1132 if (rc == -ENODEV)
1133 /* device removed - give up silently */
1134 gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1135 else
1136 dev_err(ucx->bcs->cs->dev,
1137 "could not submit isoc write URB: %s\n",
1138 get_usb_rcmsg(rc));
1139 return rc;
1140 }
1141 ++ubc->numsub;
1142 return nframe;
1143}
1144
1145/* write_iso_tasklet
1146 * tasklet scheduled when an isochronous output URB from the Gigaset device
1147 * has completed
1148 * parameter:
1149 * data B channel state structure
1150 */
1151static void write_iso_tasklet(unsigned long data)
1152{
1153 struct bc_state *bcs = (struct bc_state *) data;
1154 struct bas_bc_state *ubc = bcs->hw.bas;
1155 struct cardstate *cs = bcs->cs;
1156 struct isow_urbctx_t *done, *next, *ovfl;
1157 struct urb *urb;
1158 int status;
1159 struct usb_iso_packet_descriptor *ifd;
1160 unsigned long flags;
1161 int i;
1162 struct sk_buff *skb;
1163 int len;
1164 int rc;
1165
1166 /* loop while completed URBs arrive in time */
1167 for (;;) {
1168 if (unlikely(!(ubc->running))) {
1169 gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1170 return;
1171 }
1172
1173 /* retrieve completed URBs */
1174 spin_lock_irqsave(&ubc->isooutlock, flags);
1175 done = ubc->isooutdone;
1176 ubc->isooutdone = NULL;
1177 ovfl = ubc->isooutovfl;
1178 ubc->isooutovfl = NULL;
1179 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1180 if (ovfl) {
1181 dev_err(cs->dev, "isoc write underrun\n");
1182 error_hangup(bcs);
1183 break;
1184 }
1185 if (!done)
1186 break;
1187
1188 /* submit free URB if available */
1189 spin_lock_irqsave(&ubc->isooutlock, flags);
1190 next = ubc->isooutfree;
1191 ubc->isooutfree = NULL;
1192 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1193 if (next) {
1194 rc = submit_iso_write_urb(next);
1195 if (unlikely(rc <= 0 && rc != -ENODEV)) {
1196 /* could not submit URB, put it back */
1197 spin_lock_irqsave(&ubc->isooutlock, flags);
1198 if (ubc->isooutfree == NULL) {
1199 ubc->isooutfree = next;
1200 next = NULL;
1201 }
1202 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1203 if (next) {
1204 /* couldn't put it back */
1205 dev_err(cs->dev,
1206 "losing isoc write URB\n");
1207 error_hangup(bcs);
1208 }
1209 }
1210 }
1211
1212 /* process completed URB */
1213 urb = done->urb;
1214 status = done->status;
1215 switch (status) {
1216 case -EXDEV: /* partial completion */
1217 gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1218 __func__);
1219 /* fall through - what's the difference anyway? */
1220 case 0: /* normal completion */
1221 /* inspect individual frames
1222 * assumptions (for lack of documentation):
1223 * - actual_length bytes of first frame in error are
1224 * successfully sent
1225 * - all following frames are not sent at all
1226 */
1227 for (i = 0; i < BAS_NUMFRAMES; i++) {
1228 ifd = &urb->iso_frame_desc[i];
1229 if (ifd->status ||
1230 ifd->actual_length != ifd->length) {
1231 dev_warn(cs->dev,
1232 "isoc write: frame %d[%d/%d]: %s\n",
1233 i, ifd->actual_length,
1234 ifd->length,
1235 get_usb_statmsg(ifd->status));
1236 break;
1237 }
1238 }
1239 break;
1240 case -EPIPE: /* stall - probably underrun */
1241 dev_err(cs->dev, "isoc write: stalled\n");
1242 error_hangup(bcs);
1243 break;
1244 default: /* other errors */
1245 dev_warn(cs->dev, "isoc write: %s\n",
1246 get_usb_statmsg(status));
1247 }
1248
1249 /* mark the write buffer area covered by this URB as free */
1250 if (done->limit >= 0)
1251 ubc->isooutbuf->read = done->limit;
1252
1253 /* mark URB as free */
1254 spin_lock_irqsave(&ubc->isooutlock, flags);
1255 next = ubc->isooutfree;
1256 ubc->isooutfree = done;
1257 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1258 if (next) {
1259 /* only one URB still active - resubmit one */
1260 rc = submit_iso_write_urb(next);
1261 if (unlikely(rc <= 0 && rc != -ENODEV)) {
1262 /* couldn't submit */
1263 error_hangup(bcs);
1264 }
1265 }
1266 }
1267
1268 /* process queued SKBs */
1269 while ((skb = skb_dequeue(&bcs->squeue))) {
1270 /* copy to output buffer, doing L2 encapsulation */
1271 len = skb->len;
1272 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1273 /* insufficient buffer space, push back onto queue */
1274 skb_queue_head(&bcs->squeue, skb);
1275 gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1276 __func__, skb_queue_len(&bcs->squeue));
1277 break;
1278 }
1279 skb_pull(skb, len);
1280 gigaset_skb_sent(bcs, skb);
1281 dev_kfree_skb_any(skb);
1282 }
1283}
1284
1285/* Isochronous Read - Bottom Half */
1286/* ============================== */
1287
1288/* read_iso_tasklet
1289 * tasklet scheduled when an isochronous input URB from the Gigaset device
1290 * has completed
1291 * parameter:
1292 * data B channel state structure
1293 */
1294static void read_iso_tasklet(unsigned long data)
1295{
1296 struct bc_state *bcs = (struct bc_state *) data;
1297 struct bas_bc_state *ubc = bcs->hw.bas;
1298 struct cardstate *cs = bcs->cs;
1299 struct urb *urb;
1300 int status;
1301 struct usb_iso_packet_descriptor *ifd;
1302 char *rcvbuf;
1303 unsigned long flags;
1304 int totleft, numbytes, offset, frame, rc;
1305
1306 /* loop while more completed URBs arrive in the meantime */
1307 for (;;) {
1308 /* retrieve URB */
1309 spin_lock_irqsave(&ubc->isoinlock, flags);
1310 urb = ubc->isoindone;
1311 if (!urb) {
1312 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1313 return;
1314 }
1315 status = ubc->isoinstatus;
1316 ubc->isoindone = NULL;
1317 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1318 dev_warn(cs->dev,
1319 "isoc read overrun, URB dropped (status: %s, %d bytes)\n",
1320 get_usb_statmsg(ubc->loststatus),
1321 ubc->isoinlost);
1322 ubc->loststatus = -EINPROGRESS;
1323 }
1324 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1325
1326 if (unlikely(!(ubc->running))) {
1327 gig_dbg(DEBUG_ISO,
1328 "%s: channel not running, "
1329 "dropped URB with status: %s",
1330 __func__, get_usb_statmsg(status));
1331 return;
1332 }
1333
1334 switch (status) {
1335 case 0: /* normal completion */
1336 break;
1337 case -EXDEV: /* inspect individual frames
1338 (we do that anyway) */
1339 gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1340 __func__);
1341 break;
1342 case -ENOENT:
1343 case -ECONNRESET:
1344 case -EINPROGRESS:
1345 gig_dbg(DEBUG_ISO, "%s: %s",
1346 __func__, get_usb_statmsg(status));
1347 continue; /* -> skip */
1348 case -EPIPE:
1349 dev_err(cs->dev, "isoc read: stalled\n");
1350 error_hangup(bcs);
1351 continue; /* -> skip */
1352 default: /* other error */
1353 dev_warn(cs->dev, "isoc read: %s\n",
1354 get_usb_statmsg(status));
1355 goto error;
1356 }
1357
1358 rcvbuf = urb->transfer_buffer;
1359 totleft = urb->actual_length;
1360 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1361 ifd = &urb->iso_frame_desc[frame];
1362 numbytes = ifd->actual_length;
1363 switch (ifd->status) {
1364 case 0: /* success */
1365 break;
1366 case -EPROTO: /* protocol error or unplug */
1367 case -EILSEQ:
1368 case -ETIME:
1369 /* probably just disconnected, ignore */
1370 gig_dbg(DEBUG_ISO,
1371 "isoc read: frame %d[%d]: %s\n",
1372 frame, numbytes,
1373 get_usb_statmsg(ifd->status));
1374 break;
1375 default: /* other error */
1376 /* report, assume transferred bytes are ok */
1377 dev_warn(cs->dev,
1378 "isoc read: frame %d[%d]: %s\n",
1379 frame, numbytes,
1380 get_usb_statmsg(ifd->status));
1381 }
1382 if (unlikely(numbytes > BAS_MAXFRAME))
1383 dev_warn(cs->dev,
1384 "isoc read: frame %d[%d]: %s\n",
1385 frame, numbytes,
1386 "exceeds max frame size");
1387 if (unlikely(numbytes > totleft)) {
1388 dev_warn(cs->dev,
1389 "isoc read: frame %d[%d]: %s\n",
1390 frame, numbytes,
1391 "exceeds total transfer length");
1392 numbytes = totleft;
1393 }
1394 offset = ifd->offset;
1395 if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1396 dev_warn(cs->dev,
1397 "isoc read: frame %d[%d]: %s\n",
1398 frame, numbytes,
1399 "exceeds end of buffer");
1400 numbytes = BAS_INBUFSIZE - offset;
1401 }
1402 gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1403 totleft -= numbytes;
1404 }
1405 if (unlikely(totleft > 0))
1406 dev_warn(cs->dev, "isoc read: %d data bytes missing\n",
1407 totleft);
1408
1409error:
1410 /* URB processed, resubmit */
1411 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1412 urb->iso_frame_desc[frame].status = 0;
1413 urb->iso_frame_desc[frame].actual_length = 0;
1414 }
1415 /* urb->dev is clobbered by USB subsystem */
1416 urb->dev = bcs->cs->hw.bas->udev;
1417 urb->transfer_flags = URB_ISO_ASAP;
1418 urb->number_of_packets = BAS_NUMFRAMES;
1419 rc = usb_submit_urb(urb, GFP_ATOMIC);
1420 if (unlikely(rc != 0 && rc != -ENODEV)) {
1421 dev_err(cs->dev,
1422 "could not resubmit isoc read URB: %s\n",
1423 get_usb_rcmsg(rc));
1424 dump_urb(DEBUG_ISO, "resubmit isoc read", urb);
1425 error_hangup(bcs);
1426 }
1427 }
1428}
1429
1430/* Channel Operations */
1431/* ================== */
1432
1433/* req_timeout
1434 * timeout routine for control output request
1435 * argument:
1436 * controller state structure
1437 */
1438static void req_timeout(unsigned long data)
1439{
1440 struct cardstate *cs = (struct cardstate *) data;
1441 struct bas_cardstate *ucs = cs->hw.bas;
1442 int pending;
1443 unsigned long flags;
1444
1445 check_pending(ucs);
1446
1447 spin_lock_irqsave(&ucs->lock, flags);
1448 pending = ucs->pending;
1449 ucs->pending = 0;
1450 spin_unlock_irqrestore(&ucs->lock, flags);
1451
1452 switch (pending) {
1453 case 0: /* no pending request */
1454 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1455 break;
1456
1457 case HD_OPEN_ATCHANNEL:
1458 dev_err(cs->dev, "timeout opening AT channel\n");
1459 error_reset(cs);
1460 break;
1461
1462 case HD_OPEN_B1CHANNEL:
1463 dev_err(cs->dev, "timeout opening channel 1\n");
1464 error_hangup(&cs->bcs[0]);
1465 break;
1466
1467 case HD_OPEN_B2CHANNEL:
1468 dev_err(cs->dev, "timeout opening channel 2\n");
1469 error_hangup(&cs->bcs[1]);
1470 break;
1471
1472 case HD_CLOSE_ATCHANNEL:
1473 dev_err(cs->dev, "timeout closing AT channel\n");
1474 error_reset(cs);
1475 break;
1476
1477 case HD_CLOSE_B1CHANNEL:
1478 dev_err(cs->dev, "timeout closing channel 1\n");
1479 error_reset(cs);
1480 break;
1481
1482 case HD_CLOSE_B2CHANNEL:
1483 dev_err(cs->dev, "timeout closing channel 2\n");
1484 error_reset(cs);
1485 break;
1486
1487 case HD_RESET_INTERRUPT_PIPE:
1488 /* error recovery escalation */
1489 dev_err(cs->dev,
1490 "reset interrupt pipe timeout, attempting USB reset\n");
1491 usb_queue_reset_device(ucs->interface);
1492 break;
1493
1494 default:
1495 dev_warn(cs->dev, "request 0x%02x timed out, clearing\n",
1496 pending);
1497 }
1498
1499 wake_up(&ucs->waitqueue);
1500}
1501
1502/* write_ctrl_callback
1503 * USB completion handler for control pipe output
1504 * called by the USB subsystem in interrupt context
1505 * parameter:
1506 * urb USB request block of completed request
1507 * urb->context = hardware specific controller state structure
1508 */
1509static void write_ctrl_callback(struct urb *urb)
1510{
1511 struct bas_cardstate *ucs = urb->context;
1512 int status = urb->status;
1513 int rc;
1514 unsigned long flags;
1515
1516 /* check status */
1517 switch (status) {
1518 case 0: /* normal completion */
1519 spin_lock_irqsave(&ucs->lock, flags);
1520 switch (ucs->pending) {
1521 case HD_DEVICE_INIT_ACK: /* no reply expected */
1522 del_timer(&ucs->timer_ctrl);
1523 ucs->pending = 0;
1524 break;
1525 }
1526 spin_unlock_irqrestore(&ucs->lock, flags);
1527 return;
1528
1529 case -ENOENT: /* cancelled */
1530 case -ECONNRESET: /* cancelled (async) */
1531 case -EINPROGRESS: /* pending */
1532 case -ENODEV: /* device removed */
1533 case -ESHUTDOWN: /* device shut down */
1534 /* ignore silently */
1535 gig_dbg(DEBUG_USBREQ, "%s: %s",
1536 __func__, get_usb_statmsg(status));
1537 break;
1538
1539 default: /* any failure */
1540 /* don't retry if suspend requested */
1541 if (++ucs->retry_ctrl > BAS_RETRY ||
1542 (ucs->basstate & BS_SUSPEND)) {
1543 dev_err(&ucs->interface->dev,
1544 "control request 0x%02x failed: %s\n",
1545 ucs->dr_ctrl.bRequest,
1546 get_usb_statmsg(status));
1547 break; /* give up */
1548 }
1549 dev_notice(&ucs->interface->dev,
1550 "control request 0x%02x: %s, retry %d\n",
1551 ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1552 ucs->retry_ctrl);
1553 /* urb->dev is clobbered by USB subsystem */
1554 urb->dev = ucs->udev;
1555 rc = usb_submit_urb(urb, GFP_ATOMIC);
1556 if (unlikely(rc)) {
1557 dev_err(&ucs->interface->dev,
1558 "could not resubmit request 0x%02x: %s\n",
1559 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1560 break;
1561 }
1562 /* resubmitted */
1563 return;
1564 }
1565
1566 /* failed, clear pending request */
1567 spin_lock_irqsave(&ucs->lock, flags);
1568 del_timer(&ucs->timer_ctrl);
1569 ucs->pending = 0;
1570 spin_unlock_irqrestore(&ucs->lock, flags);
1571 wake_up(&ucs->waitqueue);
1572}
1573
1574/* req_submit
1575 * submit a control output request without message buffer to the Gigaset base
1576 * and optionally start a timeout
1577 * parameters:
1578 * bcs B channel control structure
1579 * req control request code (HD_*)
1580 * val control request parameter value (set to 0 if unused)
1581 * timeout timeout in seconds (0: no timeout)
1582 * return value:
1583 * 0 on success
1584 * -EBUSY if another request is pending
1585 * any URB submission error code
1586 */
1587static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1588{
1589 struct bas_cardstate *ucs = bcs->cs->hw.bas;
1590 int ret;
1591 unsigned long flags;
1592
1593 gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1594
1595 spin_lock_irqsave(&ucs->lock, flags);
1596 if (ucs->pending) {
1597 spin_unlock_irqrestore(&ucs->lock, flags);
1598 dev_err(bcs->cs->dev,
1599 "submission of request 0x%02x failed: "
1600 "request 0x%02x still pending\n",
1601 req, ucs->pending);
1602 return -EBUSY;
1603 }
1604
1605 ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1606 ucs->dr_ctrl.bRequest = req;
1607 ucs->dr_ctrl.wValue = cpu_to_le16(val);
1608 ucs->dr_ctrl.wIndex = 0;
1609 ucs->dr_ctrl.wLength = 0;
1610 usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1611 usb_sndctrlpipe(ucs->udev, 0),
1612 (unsigned char *) &ucs->dr_ctrl, NULL, 0,
1613 write_ctrl_callback, ucs);
1614 ucs->retry_ctrl = 0;
1615 ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1616 if (unlikely(ret)) {
1617 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1618 req, get_usb_rcmsg(ret));
1619 spin_unlock_irqrestore(&ucs->lock, flags);
1620 return ret;
1621 }
1622 ucs->pending = req;
1623
1624 if (timeout > 0) {
1625 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1626 mod_timer(&ucs->timer_ctrl, jiffies + timeout * HZ / 10);
1627 }
1628
1629 spin_unlock_irqrestore(&ucs->lock, flags);
1630 return 0;
1631}
1632
1633/* gigaset_init_bchannel
1634 * called by common.c to connect a B channel
1635 * initialize isochronous I/O and tell the Gigaset base to open the channel
1636 * argument:
1637 * B channel control structure
1638 * return value:
1639 * 0 on success, error code < 0 on error
1640 */
1641static int gigaset_init_bchannel(struct bc_state *bcs)
1642{
1643 struct cardstate *cs = bcs->cs;
1644 int req, ret;
1645 unsigned long flags;
1646
1647 spin_lock_irqsave(&cs->lock, flags);
1648 if (unlikely(!cs->connected)) {
1649 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1650 spin_unlock_irqrestore(&cs->lock, flags);
1651 return -ENODEV;
1652 }
1653
1654 if (cs->hw.bas->basstate & BS_SUSPEND) {
1655 dev_notice(cs->dev,
1656 "not starting isoc I/O, suspend in progress\n");
1657 spin_unlock_irqrestore(&cs->lock, flags);
1658 return -EHOSTUNREACH;
1659 }
1660
1661 ret = starturbs(bcs);
1662 if (ret < 0) {
1663 spin_unlock_irqrestore(&cs->lock, flags);
1664 dev_err(cs->dev,
1665 "could not start isoc I/O for channel B%d: %s\n",
1666 bcs->channel + 1,
1667 ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1668 if (ret != -ENODEV)
1669 error_hangup(bcs);
1670 return ret;
1671 }
1672
1673 req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1674 ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1675 if (ret < 0) {
1676 dev_err(cs->dev, "could not open channel B%d\n",
1677 bcs->channel + 1);
1678 stopurbs(bcs->hw.bas);
1679 }
1680
1681 spin_unlock_irqrestore(&cs->lock, flags);
1682 if (ret < 0 && ret != -ENODEV)
1683 error_hangup(bcs);
1684 return ret;
1685}
1686
1687/* gigaset_close_bchannel
1688 * called by common.c to disconnect a B channel
1689 * tell the Gigaset base to close the channel
1690 * stopping isochronous I/O and LL notification will be done when the
1691 * acknowledgement for the close arrives
1692 * argument:
1693 * B channel control structure
1694 * return value:
1695 * 0 on success, error code < 0 on error
1696 */
1697static int gigaset_close_bchannel(struct bc_state *bcs)
1698{
1699 struct cardstate *cs = bcs->cs;
1700 int req, ret;
1701 unsigned long flags;
1702
1703 spin_lock_irqsave(&cs->lock, flags);
1704 if (unlikely(!cs->connected)) {
1705 spin_unlock_irqrestore(&cs->lock, flags);
1706 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1707 return -ENODEV;
1708 }
1709
1710 if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1711 /* channel not running: just signal common.c */
1712 spin_unlock_irqrestore(&cs->lock, flags);
1713 gigaset_bchannel_down(bcs);
1714 return 0;
1715 }
1716
1717 /* channel running: tell device to close it */
1718 req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1719 ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1720 if (ret < 0)
1721 dev_err(cs->dev, "closing channel B%d failed\n",
1722 bcs->channel + 1);
1723
1724 spin_unlock_irqrestore(&cs->lock, flags);
1725 return ret;
1726}
1727
1728/* Device Operations */
1729/* ================= */
1730
1731/* complete_cb
1732 * unqueue first command buffer from queue, waking any sleepers
1733 * must be called with cs->cmdlock held
1734 * parameter:
1735 * cs controller state structure
1736 */
1737static void complete_cb(struct cardstate *cs)
1738{
1739 struct cmdbuf_t *cb = cs->cmdbuf;
1740
1741 /* unqueue completed buffer */
1742 cs->cmdbytes -= cs->curlen;
1743 gig_dbg(DEBUG_OUTPUT, "write_command: sent %u bytes, %u left",
1744 cs->curlen, cs->cmdbytes);
1745 if (cb->next != NULL) {
1746 cs->cmdbuf = cb->next;
1747 cs->cmdbuf->prev = NULL;
1748 cs->curlen = cs->cmdbuf->len;
1749 } else {
1750 cs->cmdbuf = NULL;
1751 cs->lastcmdbuf = NULL;
1752 cs->curlen = 0;
1753 }
1754
1755 if (cb->wake_tasklet)
1756 tasklet_schedule(cb->wake_tasklet);
1757
1758 kfree(cb);
1759}
1760
1761/* write_command_callback
1762 * USB completion handler for AT command transmission
1763 * called by the USB subsystem in interrupt context
1764 * parameter:
1765 * urb USB request block of completed request
1766 * urb->context = controller state structure
1767 */
1768static void write_command_callback(struct urb *urb)
1769{
1770 struct cardstate *cs = urb->context;
1771 struct bas_cardstate *ucs = cs->hw.bas;
1772 int status = urb->status;
1773 unsigned long flags;
1774
1775 update_basstate(ucs, 0, BS_ATWRPEND);
1776 wake_up(&ucs->waitqueue);
1777
1778 /* check status */
1779 switch (status) {
1780 case 0: /* normal completion */
1781 break;
1782 case -ENOENT: /* cancelled */
1783 case -ECONNRESET: /* cancelled (async) */
1784 case -EINPROGRESS: /* pending */
1785 case -ENODEV: /* device removed */
1786 case -ESHUTDOWN: /* device shut down */
1787 /* ignore silently */
1788 gig_dbg(DEBUG_USBREQ, "%s: %s",
1789 __func__, get_usb_statmsg(status));
1790 return;
1791 default: /* any failure */
1792 if (++ucs->retry_cmd_out > BAS_RETRY) {
1793 dev_warn(cs->dev,
1794 "command write: %s, "
1795 "giving up after %d retries\n",
1796 get_usb_statmsg(status),
1797 ucs->retry_cmd_out);
1798 break;
1799 }
1800 if (ucs->basstate & BS_SUSPEND) {
1801 dev_warn(cs->dev,
1802 "command write: %s, "
1803 "won't retry - suspend requested\n",
1804 get_usb_statmsg(status));
1805 break;
1806 }
1807 if (cs->cmdbuf == NULL) {
1808 dev_warn(cs->dev,
1809 "command write: %s, "
1810 "cannot retry - cmdbuf gone\n",
1811 get_usb_statmsg(status));
1812 break;
1813 }
1814 dev_notice(cs->dev, "command write: %s, retry %d\n",
1815 get_usb_statmsg(status), ucs->retry_cmd_out);
1816 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1817 /* resubmitted - bypass regular exit block */
1818 return;
1819 /* command send failed, assume base still waiting */
1820 update_basstate(ucs, BS_ATREADY, 0);
1821 }
1822
1823 spin_lock_irqsave(&cs->cmdlock, flags);
1824 if (cs->cmdbuf != NULL)
1825 complete_cb(cs);
1826 spin_unlock_irqrestore(&cs->cmdlock, flags);
1827}
1828
1829/* atrdy_timeout
1830 * timeout routine for AT command transmission
1831 * argument:
1832 * controller state structure
1833 */
1834static void atrdy_timeout(unsigned long data)
1835{
1836 struct cardstate *cs = (struct cardstate *) data;
1837 struct bas_cardstate *ucs = cs->hw.bas;
1838
1839 dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1840
1841 /* fake the missing signal - what else can I do? */
1842 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1843 start_cbsend(cs);
1844}
1845
1846/* atwrite_submit
1847 * submit an HD_WRITE_ATMESSAGE command URB
1848 * parameters:
1849 * cs controller state structure
1850 * buf buffer containing command to send
1851 * len length of command to send
1852 * return value:
1853 * 0 on success
1854 * -EBUSY if another request is pending
1855 * any URB submission error code
1856 */
1857static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1858{
1859 struct bas_cardstate *ucs = cs->hw.bas;
1860 int rc;
1861
1862 gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1863
1864 if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1865 dev_err(cs->dev,
1866 "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1867 return -EBUSY;
1868 }
1869
1870 ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1871 ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1872 ucs->dr_cmd_out.wValue = 0;
1873 ucs->dr_cmd_out.wIndex = 0;
1874 ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1875 usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1876 usb_sndctrlpipe(ucs->udev, 0),
1877 (unsigned char *) &ucs->dr_cmd_out, buf, len,
1878 write_command_callback, cs);
1879 rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1880 if (unlikely(rc)) {
1881 update_basstate(ucs, 0, BS_ATWRPEND);
1882 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1883 get_usb_rcmsg(rc));
1884 return rc;
1885 }
1886
1887 /* submitted successfully, start timeout if necessary */
1888 if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1889 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1890 ATRDY_TIMEOUT);
1891 mod_timer(&ucs->timer_atrdy, jiffies + ATRDY_TIMEOUT * HZ / 10);
1892 }
1893 return 0;
1894}
1895
1896/* start_cbsend
1897 * start transmission of AT command queue if necessary
1898 * parameter:
1899 * cs controller state structure
1900 * return value:
1901 * 0 on success
1902 * error code < 0 on error
1903 */
1904static int start_cbsend(struct cardstate *cs)
1905{
1906 struct cmdbuf_t *cb;
1907 struct bas_cardstate *ucs = cs->hw.bas;
1908 unsigned long flags;
1909 int rc;
1910 int retval = 0;
1911
1912 /* check if suspend requested */
1913 if (ucs->basstate & BS_SUSPEND) {
1914 gig_dbg(DEBUG_OUTPUT, "suspending");
1915 return -EHOSTUNREACH;
1916 }
1917
1918 /* check if AT channel is open */
1919 if (!(ucs->basstate & BS_ATOPEN)) {
1920 gig_dbg(DEBUG_OUTPUT, "AT channel not open");
1921 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1922 if (rc < 0) {
1923 /* flush command queue */
1924 spin_lock_irqsave(&cs->cmdlock, flags);
1925 while (cs->cmdbuf != NULL)
1926 complete_cb(cs);
1927 spin_unlock_irqrestore(&cs->cmdlock, flags);
1928 }
1929 return rc;
1930 }
1931
1932 /* try to send first command in queue */
1933 spin_lock_irqsave(&cs->cmdlock, flags);
1934
1935 while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1936 ucs->retry_cmd_out = 0;
1937 rc = atwrite_submit(cs, cb->buf, cb->len);
1938 if (unlikely(rc)) {
1939 retval = rc;
1940 complete_cb(cs);
1941 }
1942 }
1943
1944 spin_unlock_irqrestore(&cs->cmdlock, flags);
1945 return retval;
1946}
1947
1948/* gigaset_write_cmd
1949 * This function is called by the device independent part of the driver
1950 * to transmit an AT command string to the Gigaset device.
1951 * It encapsulates the device specific method for transmission over the
1952 * direct USB connection to the base.
1953 * The command string is added to the queue of commands to send, and
1954 * USB transmission is started if necessary.
1955 * parameters:
1956 * cs controller state structure
1957 * cb command buffer structure
1958 * return value:
1959 * number of bytes queued on success
1960 * error code < 0 on error
1961 */
1962static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb)
1963{
1964 unsigned long flags;
1965 int rc;
1966
1967 gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1968 DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1969 "CMD Transmit", cb->len, cb->buf);
1970
1971 /* translate "+++" escape sequence sent as a single separate command
1972 * into "close AT channel" command for error recovery
1973 * The next command will reopen the AT channel automatically.
1974 */
1975 if (cb->len == 3 && !memcmp(cb->buf, "+++", 3)) {
1976 /* If an HD_RECEIVEATDATA_ACK message remains unhandled
1977 * because of an error, the base never sends another one.
1978 * The response channel is thus effectively blocked.
1979 * Closing and reopening the AT channel does *not* clear
1980 * this condition.
1981 * As a stopgap measure, submit a zero-length AT read
1982 * before closing the AT channel. This has the undocumented
1983 * effect of triggering a new HD_RECEIVEATDATA_ACK message
1984 * from the base if necessary.
1985 * The subsequent AT channel close then discards any pending
1986 * messages.
1987 */
1988 spin_lock_irqsave(&cs->lock, flags);
1989 if (!(cs->hw.bas->basstate & BS_ATRDPEND)) {
1990 kfree(cs->hw.bas->rcvbuf);
1991 cs->hw.bas->rcvbuf = NULL;
1992 cs->hw.bas->rcvbuf_size = 0;
1993 cs->hw.bas->retry_cmd_in = 0;
1994 atread_submit(cs, 0);
1995 }
1996 spin_unlock_irqrestore(&cs->lock, flags);
1997
1998 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
1999 if (cb->wake_tasklet)
2000 tasklet_schedule(cb->wake_tasklet);
2001 if (!rc)
2002 rc = cb->len;
2003 kfree(cb);
2004 return rc;
2005 }
2006
2007 spin_lock_irqsave(&cs->cmdlock, flags);
2008 cb->prev = cs->lastcmdbuf;
2009 if (cs->lastcmdbuf)
2010 cs->lastcmdbuf->next = cb;
2011 else {
2012 cs->cmdbuf = cb;
2013 cs->curlen = cb->len;
2014 }
2015 cs->cmdbytes += cb->len;
2016 cs->lastcmdbuf = cb;
2017 spin_unlock_irqrestore(&cs->cmdlock, flags);
2018
2019 spin_lock_irqsave(&cs->lock, flags);
2020 if (unlikely(!cs->connected)) {
2021 spin_unlock_irqrestore(&cs->lock, flags);
2022 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
2023 /* flush command queue */
2024 spin_lock_irqsave(&cs->cmdlock, flags);
2025 while (cs->cmdbuf != NULL)
2026 complete_cb(cs);
2027 spin_unlock_irqrestore(&cs->cmdlock, flags);
2028 return -ENODEV;
2029 }
2030 rc = start_cbsend(cs);
2031 spin_unlock_irqrestore(&cs->lock, flags);
2032 return rc < 0 ? rc : cb->len;
2033}
2034
2035/* gigaset_write_room
2036 * tty_driver.write_room interface routine
2037 * return number of characters the driver will accept to be written via
2038 * gigaset_write_cmd
2039 * parameter:
2040 * controller state structure
2041 * return value:
2042 * number of characters
2043 */
2044static int gigaset_write_room(struct cardstate *cs)
2045{
2046 return IF_WRITEBUF;
2047}
2048
2049/* gigaset_chars_in_buffer
2050 * tty_driver.chars_in_buffer interface routine
2051 * return number of characters waiting to be sent
2052 * parameter:
2053 * controller state structure
2054 * return value:
2055 * number of characters
2056 */
2057static int gigaset_chars_in_buffer(struct cardstate *cs)
2058{
2059 return cs->cmdbytes;
2060}
2061
2062/* gigaset_brkchars
2063 * implementation of ioctl(GIGASET_BRKCHARS)
2064 * parameter:
2065 * controller state structure
2066 * return value:
2067 * -EINVAL (unimplemented function)
2068 */
2069static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
2070{
2071 return -EINVAL;
2072}
2073
2074
2075/* Device Initialization/Shutdown */
2076/* ============================== */
2077
2078/* Free hardware dependent part of the B channel structure
2079 * parameter:
2080 * bcs B channel structure
2081 * return value:
2082 * !=0 on success
2083 */
2084static int gigaset_freebcshw(struct bc_state *bcs)
2085{
2086 struct bas_bc_state *ubc = bcs->hw.bas;
2087 int i;
2088
2089 if (!ubc)
2090 return 0;
2091
2092 /* kill URBs and tasklets before freeing - better safe than sorry */
2093 ubc->running = 0;
2094 gig_dbg(DEBUG_INIT, "%s: killing isoc URBs", __func__);
2095 for (i = 0; i < BAS_OUTURBS; ++i) {
2096 usb_kill_urb(ubc->isoouturbs[i].urb);
2097 usb_free_urb(ubc->isoouturbs[i].urb);
2098 }
2099 for (i = 0; i < BAS_INURBS; ++i) {
2100 usb_kill_urb(ubc->isoinurbs[i]);
2101 usb_free_urb(ubc->isoinurbs[i]);
2102 }
2103 tasklet_kill(&ubc->sent_tasklet);
2104 tasklet_kill(&ubc->rcvd_tasklet);
2105 kfree(ubc->isooutbuf);
2106 kfree(ubc);
2107 bcs->hw.bas = NULL;
2108 return 1;
2109}
2110
2111/* Initialize hardware dependent part of the B channel structure
2112 * parameter:
2113 * bcs B channel structure
2114 * return value:
2115 * !=0 on success
2116 */
2117static int gigaset_initbcshw(struct bc_state *bcs)
2118{
2119 int i;
2120 struct bas_bc_state *ubc;
2121
2122 bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2123 if (!ubc) {
2124 pr_err("out of memory\n");
2125 return 0;
2126 }
2127
2128 ubc->running = 0;
2129 atomic_set(&ubc->corrbytes, 0);
2130 spin_lock_init(&ubc->isooutlock);
2131 for (i = 0; i < BAS_OUTURBS; ++i) {
2132 ubc->isoouturbs[i].urb = NULL;
2133 ubc->isoouturbs[i].bcs = bcs;
2134 }
2135 ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2136 ubc->numsub = 0;
2137 ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL);
2138 if (!ubc->isooutbuf) {
2139 pr_err("out of memory\n");
2140 kfree(ubc);
2141 bcs->hw.bas = NULL;
2142 return 0;
2143 }
2144 tasklet_init(&ubc->sent_tasklet,
2145 write_iso_tasklet, (unsigned long) bcs);
2146
2147 spin_lock_init(&ubc->isoinlock);
2148 for (i = 0; i < BAS_INURBS; ++i)
2149 ubc->isoinurbs[i] = NULL;
2150 ubc->isoindone = NULL;
2151 ubc->loststatus = -EINPROGRESS;
2152 ubc->isoinlost = 0;
2153 ubc->seqlen = 0;
2154 ubc->inbyte = 0;
2155 ubc->inbits = 0;
2156 ubc->goodbytes = 0;
2157 ubc->alignerrs = 0;
2158 ubc->fcserrs = 0;
2159 ubc->frameerrs = 0;
2160 ubc->giants = 0;
2161 ubc->runts = 0;
2162 ubc->aborts = 0;
2163 ubc->shared0s = 0;
2164 ubc->stolen0s = 0;
2165 tasklet_init(&ubc->rcvd_tasklet,
2166 read_iso_tasklet, (unsigned long) bcs);
2167 return 1;
2168}
2169
2170static void gigaset_reinitbcshw(struct bc_state *bcs)
2171{
2172 struct bas_bc_state *ubc = bcs->hw.bas;
2173
2174 bcs->hw.bas->running = 0;
2175 atomic_set(&bcs->hw.bas->corrbytes, 0);
2176 bcs->hw.bas->numsub = 0;
2177 spin_lock_init(&ubc->isooutlock);
2178 spin_lock_init(&ubc->isoinlock);
2179 ubc->loststatus = -EINPROGRESS;
2180}
2181
2182static void gigaset_freecshw(struct cardstate *cs)
2183{
2184 /* timers, URBs and rcvbuf are disposed of in disconnect */
2185 kfree(cs->hw.bas->int_in_buf);
2186 kfree(cs->hw.bas);
2187 cs->hw.bas = NULL;
2188}
2189
2190static int gigaset_initcshw(struct cardstate *cs)
2191{
2192 struct bas_cardstate *ucs;
2193
2194 cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2195 if (!ucs) {
2196 pr_err("out of memory\n");
2197 return 0;
2198 }
2199 ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
2200 if (!ucs->int_in_buf) {
2201 kfree(ucs);
2202 pr_err("out of memory\n");
2203 return 0;
2204 }
2205
2206 ucs->urb_cmd_in = NULL;
2207 ucs->urb_cmd_out = NULL;
2208 ucs->rcvbuf = NULL;
2209 ucs->rcvbuf_size = 0;
2210
2211 spin_lock_init(&ucs->lock);
2212 ucs->pending = 0;
2213
2214 ucs->basstate = 0;
2215 setup_timer(&ucs->timer_ctrl, req_timeout, (unsigned long) cs);
2216 setup_timer(&ucs->timer_atrdy, atrdy_timeout, (unsigned long) cs);
2217 setup_timer(&ucs->timer_cmd_in, cmd_in_timeout, (unsigned long) cs);
2218 setup_timer(&ucs->timer_int_in, int_in_resubmit, (unsigned long) cs);
2219 init_waitqueue_head(&ucs->waitqueue);
2220 INIT_WORK(&ucs->int_in_wq, int_in_work);
2221
2222 return 1;
2223}
2224
2225/* freeurbs
2226 * unlink and deallocate all URBs unconditionally
2227 * caller must make sure that no commands are still in progress
2228 * parameter:
2229 * cs controller state structure
2230 */
2231static void freeurbs(struct cardstate *cs)
2232{
2233 struct bas_cardstate *ucs = cs->hw.bas;
2234 struct bas_bc_state *ubc;
2235 int i, j;
2236
2237 gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2238 for (j = 0; j < BAS_CHANNELS; ++j) {
2239 ubc = cs->bcs[j].hw.bas;
2240 for (i = 0; i < BAS_OUTURBS; ++i) {
2241 usb_kill_urb(ubc->isoouturbs[i].urb);
2242 usb_free_urb(ubc->isoouturbs[i].urb);
2243 ubc->isoouturbs[i].urb = NULL;
2244 }
2245 for (i = 0; i < BAS_INURBS; ++i) {
2246 usb_kill_urb(ubc->isoinurbs[i]);
2247 usb_free_urb(ubc->isoinurbs[i]);
2248 ubc->isoinurbs[i] = NULL;
2249 }
2250 }
2251 usb_kill_urb(ucs->urb_int_in);
2252 usb_free_urb(ucs->urb_int_in);
2253 ucs->urb_int_in = NULL;
2254 usb_kill_urb(ucs->urb_cmd_out);
2255 usb_free_urb(ucs->urb_cmd_out);
2256 ucs->urb_cmd_out = NULL;
2257 usb_kill_urb(ucs->urb_cmd_in);
2258 usb_free_urb(ucs->urb_cmd_in);
2259 ucs->urb_cmd_in = NULL;
2260 usb_kill_urb(ucs->urb_ctrl);
2261 usb_free_urb(ucs->urb_ctrl);
2262 ucs->urb_ctrl = NULL;
2263}
2264
2265/* gigaset_probe
2266 * This function is called when a new USB device is connected.
2267 * It checks whether the new device is handled by this driver.
2268 */
2269static int gigaset_probe(struct usb_interface *interface,
2270 const struct usb_device_id *id)
2271{
2272 struct usb_host_interface *hostif;
2273 struct usb_device *udev = interface_to_usbdev(interface);
2274 struct cardstate *cs = NULL;
2275 struct bas_cardstate *ucs = NULL;
2276 struct bas_bc_state *ubc;
2277 struct usb_endpoint_descriptor *endpoint;
2278 int i, j;
2279 int rc;
2280
2281 gig_dbg(DEBUG_INIT,
2282 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2283 __func__, le16_to_cpu(udev->descriptor.idVendor),
2284 le16_to_cpu(udev->descriptor.idProduct));
2285
2286 /* set required alternate setting */
2287 hostif = interface->cur_altsetting;
2288 if (hostif->desc.bAlternateSetting != 3) {
2289 gig_dbg(DEBUG_INIT,
2290 "%s: wrong alternate setting %d - trying to switch",
2291 __func__, hostif->desc.bAlternateSetting);
2292 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3)
2293 < 0) {
2294 dev_warn(&udev->dev, "usb_set_interface failed, "
2295 "device %d interface %d altsetting %d\n",
2296 udev->devnum, hostif->desc.bInterfaceNumber,
2297 hostif->desc.bAlternateSetting);
2298 return -ENODEV;
2299 }
2300 hostif = interface->cur_altsetting;
2301 }
2302
2303 /* Reject application specific interfaces
2304 */
2305 if (hostif->desc.bInterfaceClass != 255) {
2306 dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2307 __func__, hostif->desc.bInterfaceClass);
2308 return -ENODEV;
2309 }
2310
2311 dev_info(&udev->dev,
2312 "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2313 __func__, le16_to_cpu(udev->descriptor.idVendor),
2314 le16_to_cpu(udev->descriptor.idProduct));
2315
2316 /* allocate memory for our device state and initialize it */
2317 cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
2318 GIGASET_MODULENAME);
2319 if (!cs)
2320 return -ENODEV;
2321 ucs = cs->hw.bas;
2322
2323 /* save off device structure ptrs for later use */
2324 usb_get_dev(udev);
2325 ucs->udev = udev;
2326 ucs->interface = interface;
2327 cs->dev = &interface->dev;
2328
2329 /* allocate URBs:
2330 * - one for the interrupt pipe
2331 * - three for the different uses of the default control pipe
2332 * - three for each isochronous pipe
2333 */
2334 if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2335 !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2336 !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
2337 !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2338 goto allocerr;
2339
2340 for (j = 0; j < BAS_CHANNELS; ++j) {
2341 ubc = cs->bcs[j].hw.bas;
2342 for (i = 0; i < BAS_OUTURBS; ++i)
2343 if (!(ubc->isoouturbs[i].urb =
2344 usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2345 goto allocerr;
2346 for (i = 0; i < BAS_INURBS; ++i)
2347 if (!(ubc->isoinurbs[i] =
2348 usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2349 goto allocerr;
2350 }
2351
2352 ucs->rcvbuf = NULL;
2353 ucs->rcvbuf_size = 0;
2354
2355 /* Fill the interrupt urb and send it to the core */
2356 endpoint = &hostif->endpoint[0].desc;
2357 usb_fill_int_urb(ucs->urb_int_in, udev,
2358 usb_rcvintpipe(udev,
2359 (endpoint->bEndpointAddress) & 0x0f),
2360 ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
2361 endpoint->bInterval);
2362 rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2363 if (rc != 0) {
2364 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2365 get_usb_rcmsg(rc));
2366 goto error;
2367 }
2368 ucs->retry_int_in = 0;
2369
2370 /* tell the device that the driver is ready */
2371 rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
2372 if (rc != 0)
2373 goto error;
2374
2375 /* tell common part that the device is ready */
2376 if (startmode == SM_LOCKED)
2377 cs->mstate = MS_LOCKED;
2378
2379 /* save address of controller structure */
2380 usb_set_intfdata(interface, cs);
2381
2382 if (!gigaset_start(cs))
2383 goto error;
2384
2385 return 0;
2386
2387allocerr:
2388 dev_err(cs->dev, "could not allocate URBs\n");
2389error:
2390 freeurbs(cs);
2391 usb_set_intfdata(interface, NULL);
2392 gigaset_freecs(cs);
2393 return -ENODEV;
2394}
2395
2396/* gigaset_disconnect
2397 * This function is called when the Gigaset base is unplugged.
2398 */
2399static void gigaset_disconnect(struct usb_interface *interface)
2400{
2401 struct cardstate *cs;
2402 struct bas_cardstate *ucs;
2403 int j;
2404
2405 cs = usb_get_intfdata(interface);
2406
2407 ucs = cs->hw.bas;
2408
2409 dev_info(cs->dev, "disconnecting Gigaset base\n");
2410
2411 /* mark base as not ready, all channels disconnected */
2412 ucs->basstate = 0;
2413
2414 /* tell LL all channels are down */
2415 for (j = 0; j < BAS_CHANNELS; ++j)
2416 gigaset_bchannel_down(cs->bcs + j);
2417
2418 /* stop driver (common part) */
2419 gigaset_stop(cs);
2420
2421 /* stop delayed work and URBs, free ressources */
2422 del_timer_sync(&ucs->timer_ctrl);
2423 del_timer_sync(&ucs->timer_atrdy);
2424 del_timer_sync(&ucs->timer_cmd_in);
2425 del_timer_sync(&ucs->timer_int_in);
2426 cancel_work_sync(&ucs->int_in_wq);
2427 freeurbs(cs);
2428 usb_set_intfdata(interface, NULL);
2429 kfree(ucs->rcvbuf);
2430 ucs->rcvbuf = NULL;
2431 ucs->rcvbuf_size = 0;
2432 usb_put_dev(ucs->udev);
2433 ucs->interface = NULL;
2434 ucs->udev = NULL;
2435 cs->dev = NULL;
2436 gigaset_freecs(cs);
2437}
2438
2439/* gigaset_suspend
2440 * This function is called before the USB connection is suspended.
2441 */
2442static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2443{
2444 struct cardstate *cs = usb_get_intfdata(intf);
2445 struct bas_cardstate *ucs = cs->hw.bas;
2446 int rc;
2447
2448 /* set suspend flag; this stops AT command/response traffic */
2449 if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2450 gig_dbg(DEBUG_SUSPEND, "already suspended");
2451 return 0;
2452 }
2453
2454 /* wait a bit for blocking conditions to go away */
2455 rc = wait_event_timeout(ucs->waitqueue,
2456 !(ucs->basstate &
2457 (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)),
2458 BAS_TIMEOUT*HZ/10);
2459 gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2460
2461 /* check for conditions preventing suspend */
2462 if (ucs->basstate & (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)) {
2463 dev_warn(cs->dev, "cannot suspend:\n");
2464 if (ucs->basstate & BS_B1OPEN)
2465 dev_warn(cs->dev, " B channel 1 open\n");
2466 if (ucs->basstate & BS_B2OPEN)
2467 dev_warn(cs->dev, " B channel 2 open\n");
2468 if (ucs->basstate & BS_ATRDPEND)
2469 dev_warn(cs->dev, " receiving AT reply\n");
2470 if (ucs->basstate & BS_ATWRPEND)
2471 dev_warn(cs->dev, " sending AT command\n");
2472 update_basstate(ucs, 0, BS_SUSPEND);
2473 return -EBUSY;
2474 }
2475
2476 /* close AT channel if open */
2477 if (ucs->basstate & BS_ATOPEN) {
2478 gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2479 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2480 if (rc) {
2481 update_basstate(ucs, 0, BS_SUSPEND);
2482 return rc;
2483 }
2484 wait_event_timeout(ucs->waitqueue, !ucs->pending,
2485 BAS_TIMEOUT*HZ/10);
2486 /* in case of timeout, proceed anyway */
2487 }
2488
2489 /* kill all URBs and delayed work that might still be pending */
2490 usb_kill_urb(ucs->urb_ctrl);
2491 usb_kill_urb(ucs->urb_int_in);
2492 del_timer_sync(&ucs->timer_ctrl);
2493 del_timer_sync(&ucs->timer_atrdy);
2494 del_timer_sync(&ucs->timer_cmd_in);
2495 del_timer_sync(&ucs->timer_int_in);
2496 cancel_work_sync(&ucs->int_in_wq);
2497
2498 gig_dbg(DEBUG_SUSPEND, "suspend complete");
2499 return 0;
2500}
2501
2502/* gigaset_resume
2503 * This function is called after the USB connection has been resumed.
2504 */
2505static int gigaset_resume(struct usb_interface *intf)
2506{
2507 struct cardstate *cs = usb_get_intfdata(intf);
2508 struct bas_cardstate *ucs = cs->hw.bas;
2509 int rc;
2510
2511 /* resubmit interrupt URB for spontaneous messages from base */
2512 rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2513 if (rc) {
2514 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2515 get_usb_rcmsg(rc));
2516 return rc;
2517 }
2518 ucs->retry_int_in = 0;
2519
2520 /* clear suspend flag to reallow activity */
2521 update_basstate(ucs, 0, BS_SUSPEND);
2522
2523 gig_dbg(DEBUG_SUSPEND, "resume complete");
2524 return 0;
2525}
2526
2527/* gigaset_pre_reset
2528 * This function is called before the USB connection is reset.
2529 */
2530static int gigaset_pre_reset(struct usb_interface *intf)
2531{
2532 /* handle just like suspend */
2533 return gigaset_suspend(intf, PMSG_ON);
2534}
2535
2536/* gigaset_post_reset
2537 * This function is called after the USB connection has been reset.
2538 */
2539static int gigaset_post_reset(struct usb_interface *intf)
2540{
2541 /* FIXME: send HD_DEVICE_INIT_ACK? */
2542
2543 /* resume operations */
2544 return gigaset_resume(intf);
2545}
2546
2547
2548static const struct gigaset_ops gigops = {
2549 gigaset_write_cmd,
2550 gigaset_write_room,
2551 gigaset_chars_in_buffer,
2552 gigaset_brkchars,
2553 gigaset_init_bchannel,
2554 gigaset_close_bchannel,
2555 gigaset_initbcshw,
2556 gigaset_freebcshw,
2557 gigaset_reinitbcshw,
2558 gigaset_initcshw,
2559 gigaset_freecshw,
2560 gigaset_set_modem_ctrl,
2561 gigaset_baud_rate,
2562 gigaset_set_line_ctrl,
2563 gigaset_isoc_send_skb,
2564 gigaset_isoc_input,
2565};
2566
2567/* bas_gigaset_init
2568 * This function is called after the kernel module is loaded.
2569 */
2570static int __init bas_gigaset_init(void)
2571{
2572 int result;
2573
2574 /* allocate memory for our driver state and initialize it */
2575 driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2576 GIGASET_MODULENAME, GIGASET_DEVNAME,
2577 &gigops, THIS_MODULE);
2578 if (driver == NULL)
2579 goto error;
2580
2581 /* register this driver with the USB subsystem */
2582 result = usb_register(&gigaset_usb_driver);
2583 if (result < 0) {
2584 pr_err("error %d registering USB driver\n", -result);
2585 goto error;
2586 }
2587
2588 pr_info(DRIVER_DESC "\n");
2589 return 0;
2590
2591error:
2592 if (driver)
2593 gigaset_freedriver(driver);
2594 driver = NULL;
2595 return -1;
2596}
2597
2598/* bas_gigaset_exit
2599 * This function is called before the kernel module is unloaded.
2600 */
2601static void __exit bas_gigaset_exit(void)
2602{
2603 struct bas_cardstate *ucs;
2604 int i;
2605
2606 gigaset_blockdriver(driver); /* => probe will fail
2607 * => no gigaset_start any more
2608 */
2609
2610 /* stop all connected devices */
2611 for (i = 0; i < driver->minors; i++) {
2612 if (gigaset_shutdown(driver->cs + i) < 0)
2613 continue; /* no device */
2614 /* from now on, no isdn callback should be possible */
2615
2616 /* close all still open channels */
2617 ucs = driver->cs[i].hw.bas;
2618 if (ucs->basstate & BS_B1OPEN) {
2619 gig_dbg(DEBUG_INIT, "closing B1 channel");
2620 usb_control_msg(ucs->udev,
2621 usb_sndctrlpipe(ucs->udev, 0),
2622 HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2623 0, 0, NULL, 0, BAS_TIMEOUT);
2624 }
2625 if (ucs->basstate & BS_B2OPEN) {
2626 gig_dbg(DEBUG_INIT, "closing B2 channel");
2627 usb_control_msg(ucs->udev,
2628 usb_sndctrlpipe(ucs->udev, 0),
2629 HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2630 0, 0, NULL, 0, BAS_TIMEOUT);
2631 }
2632 if (ucs->basstate & BS_ATOPEN) {
2633 gig_dbg(DEBUG_INIT, "closing AT channel");
2634 usb_control_msg(ucs->udev,
2635 usb_sndctrlpipe(ucs->udev, 0),
2636 HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2637 0, 0, NULL, 0, BAS_TIMEOUT);
2638 }
2639 ucs->basstate = 0;
2640 }
2641
2642 /* deregister this driver with the USB subsystem */
2643 usb_deregister(&gigaset_usb_driver);
2644 /* this will call the disconnect-callback */
2645 /* from now on, no disconnect/probe callback should be running */
2646
2647 gigaset_freedriver(driver);
2648 driver = NULL;
2649}
2650
2651
2652module_init(bas_gigaset_init);
2653module_exit(bas_gigaset_exit);
2654
2655MODULE_AUTHOR(DRIVER_AUTHOR);
2656MODULE_DESCRIPTION(DRIVER_DESC);
2657MODULE_LICENSE("GPL");