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ext3: Fix data / filesystem corruption when write fails to copy data
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / isdn / gigaset / bas-gigaset.c
blob95ebc5129895152432a3afc212b8851aafbe5553
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
18 #include <linux/errno.h>
19 #include <linux/init.h>
20 #include <linux/slab.h>
21 #include <linux/timer.h>
22 #include <linux/usb.h>
23 #include <linux/module.h>
24 #include <linux/moduleparam.h>
25
26 /* Version Information */
27 #define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
28 #define DRIVER_DESC "USB Driver for Gigaset 307x"
29
30
31 /* Module parameters */
32
33 static int startmode = SM_ISDN;
34 static int cidmode = 1;
35
36 module_param(startmode, int, S_IRUGO);
37 module_param(cidmode, int, S_IRUGO);
38 MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
39 MODULE_PARM_DESC(cidmode, "Call-ID mode");
40
41 #define GIGASET_MINORS 1
42 #define GIGASET_MINOR 16
43 #define GIGASET_MODULENAME "bas_gigaset"
44 #define GIGASET_DEVNAME "ttyGB"
45
46 /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
47 #define IF_WRITEBUF 264
48
49 /* interrupt pipe message size according to ibid. ch. 2.2 */
50 #define IP_MSGSIZE 3
51
52 /* Values for the Gigaset 307x */
53 #define USB_GIGA_VENDOR_ID 0x0681
54 #define USB_3070_PRODUCT_ID 0x0001
55 #define USB_3075_PRODUCT_ID 0x0002
56 #define USB_SX303_PRODUCT_ID 0x0021
57 #define USB_SX353_PRODUCT_ID 0x0022
58
59 /* table of devices that work with this driver */
60 static const struct usb_device_id gigaset_table[] = {
61 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
62 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
63 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
64 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
65 { } /* Terminating entry */
66 };
67
68 MODULE_DEVICE_TABLE(usb, gigaset_table);
69
70 /*======================= local function prototypes ==========================*/
71
72 /* function called if a new device belonging to this driver is connected */
73 static int gigaset_probe(struct usb_interface *interface,
74 const struct usb_device_id *id);
75
76 /* Function will be called if the device is unplugged */
77 static void gigaset_disconnect(struct usb_interface *interface);
78
79 /* functions called before/after suspend */
80 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
81 static int gigaset_resume(struct usb_interface *intf);
82
83 /* functions called before/after device reset */
84 static int gigaset_pre_reset(struct usb_interface *intf);
85 static int gigaset_post_reset(struct usb_interface *intf);
86
87 static int atread_submit(struct cardstate *, int);
88 static void stopurbs(struct bas_bc_state *);
89 static int req_submit(struct bc_state *, int, int, int);
90 static int atwrite_submit(struct cardstate *, unsigned char *, int);
91 static int start_cbsend(struct cardstate *);
92
93 /*============================================================================*/
94
95 struct bas_cardstate {
96 struct usb_device *udev; /* USB device pointer */
97 struct usb_interface *interface; /* interface for this device */
98 unsigned char minor; /* starting minor number */
99
100 struct urb *urb_ctrl; /* control pipe default URB */
101 struct usb_ctrlrequest dr_ctrl;
102 struct timer_list timer_ctrl; /* control request timeout */
103 int retry_ctrl;
104
105 struct timer_list timer_atrdy; /* AT command ready timeout */
106 struct urb *urb_cmd_out; /* for sending AT commands */
107 struct usb_ctrlrequest dr_cmd_out;
108 int retry_cmd_out;
109
110 struct urb *urb_cmd_in; /* for receiving AT replies */
111 struct usb_ctrlrequest dr_cmd_in;
112 struct timer_list timer_cmd_in; /* receive request timeout */
113 unsigned char *rcvbuf; /* AT reply receive buffer */
114
115 struct urb *urb_int_in; /* URB for interrupt pipe */
116 unsigned char *int_in_buf;
117
118 spinlock_t lock; /* locks all following */
119 int basstate; /* bitmap (BS_*) */
120 int pending; /* uncompleted base request */
121 wait_queue_head_t waitqueue;
122 int rcvbuf_size; /* size of AT receive buffer */
123 /* 0: no receive in progress */
124 int retry_cmd_in; /* receive req retry count */
125 };
126
127 /* status of direct USB connection to 307x base (bits in basstate) */
128 #define BS_ATOPEN 0x001 /* AT channel open */
129 #define BS_B1OPEN 0x002 /* B channel 1 open */
130 #define BS_B2OPEN 0x004 /* B channel 2 open */
131 #define BS_ATREADY 0x008 /* base ready for AT command */
132 #define BS_INIT 0x010 /* base has signalled INIT_OK */
133 #define BS_ATTIMER 0x020 /* waiting for HD_READY_SEND_ATDATA */
134 #define BS_ATRDPEND 0x040 /* urb_cmd_in in use */
135 #define BS_ATWRPEND 0x080 /* urb_cmd_out in use */
136 #define BS_SUSPEND 0x100 /* USB port suspended */
137 #define BS_RESETTING 0x200 /* waiting for HD_RESET_INTERRUPT_PIPE_ACK */
138
139
140 static struct gigaset_driver *driver;
141
142 /* usb specific object needed to register this driver with the usb subsystem */
143 static struct usb_driver gigaset_usb_driver = {
144 .name = GIGASET_MODULENAME,
145 .probe = gigaset_probe,
146 .disconnect = gigaset_disconnect,
147 .id_table = gigaset_table,
148 .suspend = gigaset_suspend,
149 .resume = gigaset_resume,
150 .reset_resume = gigaset_post_reset,
151 .pre_reset = gigaset_pre_reset,
152 .post_reset = gigaset_post_reset,
153 };
154
155 /* get message text for usb_submit_urb return code
156 */
157 static char *get_usb_rcmsg(int rc)
158 {
159 static char unkmsg[28];
160
161 switch (rc) {
162 case 0:
163 return "success";
164 case -ENOMEM:
165 return "out of memory";
166 case -ENODEV:
167 return "device not present";
168 case -ENOENT:
169 return "endpoint not present";
170 case -ENXIO:
171 return "URB type not supported";
172 case -EINVAL:
173 return "invalid argument";
174 case -EAGAIN:
175 return "start frame too early or too much scheduled";
176 case -EFBIG:
177 return "too many isochronous frames requested";
178 case -EPIPE:
179 return "endpoint stalled";
180 case -EMSGSIZE:
181 return "invalid packet size";
182 case -ENOSPC:
183 return "would overcommit USB bandwidth";
184 case -ESHUTDOWN:
185 return "device shut down";
186 case -EPERM:
187 return "reject flag set";
188 case -EHOSTUNREACH:
189 return "device suspended";
190 default:
191 snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
192 return unkmsg;
193 }
194 }
195
196 /* get message text for USB status code
197 */
198 static char *get_usb_statmsg(int status)
199 {
200 static char unkmsg[28];
201
202 switch (status) {
203 case 0:
204 return "success";
205 case -ENOENT:
206 return "unlinked (sync)";
207 case -EINPROGRESS:
208 return "pending";
209 case -EPROTO:
210 return "bit stuffing error, timeout, or unknown USB error";
211 case -EILSEQ:
212 return "CRC mismatch, timeout, or unknown USB error";
213 case -ETIME:
214 return "timed out";
215 case -EPIPE:
216 return "endpoint stalled";
217 case -ECOMM:
218 return "IN buffer overrun";
219 case -ENOSR:
220 return "OUT buffer underrun";
221 case -EOVERFLOW:
222 return "too much data";
223 case -EREMOTEIO:
224 return "short packet detected";
225 case -ENODEV:
226 return "device removed";
227 case -EXDEV:
228 return "partial isochronous transfer";
229 case -EINVAL:
230 return "invalid argument";
231 case -ECONNRESET:
232 return "unlinked (async)";
233 case -ESHUTDOWN:
234 return "device shut down";
235 default:
236 snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
237 return unkmsg;
238 }
239 }
240
241 /* usb_pipetype_str
242 * retrieve string representation of USB pipe type
243 */
244 static inline char *usb_pipetype_str(int pipe)
245 {
246 if (usb_pipeisoc(pipe))
247 return "Isoc";
248 if (usb_pipeint(pipe))
249 return "Int";
250 if (usb_pipecontrol(pipe))
251 return "Ctrl";
252 if (usb_pipebulk(pipe))
253 return "Bulk";
254 return "?";
255 }
256
257 /* dump_urb
258 * write content of URB to syslog for debugging
259 */
260 static inline void dump_urb(enum debuglevel level, const char *tag,
261 struct urb *urb)
262 {
263 #ifdef CONFIG_GIGASET_DEBUG
264 int i;
265 gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
266 if (urb) {
267 gig_dbg(level,
268 " dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
269 "hcpriv=0x%08lx, transfer_flags=0x%x,",
270 (unsigned long) urb->dev,
271 usb_pipetype_str(urb->pipe),
272 usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
273 usb_pipein(urb->pipe) ? "in" : "out",
274 (unsigned long) urb->hcpriv,
275 urb->transfer_flags);
276 gig_dbg(level,
277 " transfer_buffer=0x%08lx[%d], actual_length=%d, "
278 "setup_packet=0x%08lx,",
279 (unsigned long) urb->transfer_buffer,
280 urb->transfer_buffer_length, urb->actual_length,
281 (unsigned long) urb->setup_packet);
282 gig_dbg(level,
283 " start_frame=%d, number_of_packets=%d, interval=%d, "
284 "error_count=%d,",
285 urb->start_frame, urb->number_of_packets, urb->interval,
286 urb->error_count);
287 gig_dbg(level,
288 " context=0x%08lx, complete=0x%08lx, "
289 "iso_frame_desc[]={",
290 (unsigned long) urb->context,
291 (unsigned long) urb->complete);
292 for (i = 0; i < urb->number_of_packets; i++) {
293 struct usb_iso_packet_descriptor *pifd
294 = &urb->iso_frame_desc[i];
295 gig_dbg(level,
296 " {offset=%u, length=%u, actual_length=%u, "
297 "status=%u}",
298 pifd->offset, pifd->length, pifd->actual_length,
299 pifd->status);
300 }
301 }
302 gig_dbg(level, "}}");
303 #endif
304 }
305
306 /* read/set modem control bits etc. (m10x only) */
307 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
308 unsigned new_state)
309 {
310 return -EINVAL;
311 }
312
313 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
314 {
315 return -EINVAL;
316 }
317
318 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
319 {
320 return -EINVAL;
321 }
322
323 /* set/clear bits in base connection state, return previous state
324 */
325 static inline int update_basstate(struct bas_cardstate *ucs,
326 int set, int clear)
327 {
328 unsigned long flags;
329 int state;
330
331 spin_lock_irqsave(&ucs->lock, flags);
332 state = ucs->basstate;
333 ucs->basstate = (state & ~clear) | set;
334 spin_unlock_irqrestore(&ucs->lock, flags);
335 return state;
336 }
337
338 /* error_hangup
339 * hang up any existing connection because of an unrecoverable error
340 * This function may be called from any context and takes care of scheduling
341 * the necessary actions for execution outside of interrupt context.
342 * cs->lock must not be held.
343 * argument:
344 * B channel control structure
345 */
346 static inline void error_hangup(struct bc_state *bcs)
347 {
348 struct cardstate *cs = bcs->cs;
349
350 gig_dbg(DEBUG_ANY, "%s: scheduling HUP for channel %d",
351 __func__, bcs->channel);
352
353 if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL))
354 dev_err(cs->dev, "event queue full\n");
355
356 gigaset_schedule_event(cs);
357 }
358
359 /* error_reset
360 * reset Gigaset device because of an unrecoverable error
361 * This function may be called from any context, and takes care of
362 * scheduling the necessary actions for execution outside of interrupt context.
363 * cs->lock must not be held.
364 * argument:
365 * controller state structure
366 */
367 static inline void error_reset(struct cardstate *cs)
368 {
369 /* reset interrupt pipe to recover (ignore errors) */
370 update_basstate(cs->hw.bas, BS_RESETTING, 0);
371 req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT);
372 }
373
374 /* check_pending
375 * check for completion of pending control request
376 * parameter:
377 * ucs hardware specific controller state structure
378 */
379 static void check_pending(struct bas_cardstate *ucs)
380 {
381 unsigned long flags;
382
383 spin_lock_irqsave(&ucs->lock, flags);
384 switch (ucs->pending) {
385 case 0:
386 break;
387 case HD_OPEN_ATCHANNEL:
388 if (ucs->basstate & BS_ATOPEN)
389 ucs->pending = 0;
390 break;
391 case HD_OPEN_B1CHANNEL:
392 if (ucs->basstate & BS_B1OPEN)
393 ucs->pending = 0;
394 break;
395 case HD_OPEN_B2CHANNEL:
396 if (ucs->basstate & BS_B2OPEN)
397 ucs->pending = 0;
398 break;
399 case HD_CLOSE_ATCHANNEL:
400 if (!(ucs->basstate & BS_ATOPEN))
401 ucs->pending = 0;
402 break;
403 case HD_CLOSE_B1CHANNEL:
404 if (!(ucs->basstate & BS_B1OPEN))
405 ucs->pending = 0;
406 break;
407 case HD_CLOSE_B2CHANNEL:
408 if (!(ucs->basstate & BS_B2OPEN))
409 ucs->pending = 0;
410 break;
411 case HD_DEVICE_INIT_ACK: /* no reply expected */
412 ucs->pending = 0;
413 break;
414 case HD_RESET_INTERRUPT_PIPE:
415 if (!(ucs->basstate & BS_RESETTING))
416 ucs->pending = 0;
417 break;
418 /*
419 * HD_READ_ATMESSAGE and HD_WRITE_ATMESSAGE are handled separately
420 * and should never end up here
421 */
422 default:
423 dev_warn(&ucs->interface->dev,
424 "unknown pending request 0x%02x cleared\n",
425 ucs->pending);
426 ucs->pending = 0;
427 }
428
429 if (!ucs->pending)
430 del_timer(&ucs->timer_ctrl);
431
432 spin_unlock_irqrestore(&ucs->lock, flags);
433 }
434
435 /* cmd_in_timeout
436 * timeout routine for command input request
437 * argument:
438 * controller state structure
439 */
440 static void cmd_in_timeout(unsigned long data)
441 {
442 struct cardstate *cs = (struct cardstate *) data;
443 struct bas_cardstate *ucs = cs->hw.bas;
444 int rc;
445
446 if (!ucs->rcvbuf_size) {
447 gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
448 return;
449 }
450
451 if (ucs->retry_cmd_in++ < BAS_RETRY) {
452 dev_notice(cs->dev, "control read: timeout, retry %d\n",
453 ucs->retry_cmd_in);
454 rc = atread_submit(cs, BAS_TIMEOUT);
455 if (rc >= 0 || rc == -ENODEV)
456 /* resubmitted or disconnected */
457 /* - bypass regular exit block */
458 return;
459 } else {
460 dev_err(cs->dev,
461 "control read: timeout, giving up after %d tries\n",
462 ucs->retry_cmd_in);
463 }
464 kfree(ucs->rcvbuf);
465 ucs->rcvbuf = NULL;
466 ucs->rcvbuf_size = 0;
467 error_reset(cs);
468 }
469
470 /* read_ctrl_callback
471 * USB completion handler for control pipe input
472 * called by the USB subsystem in interrupt context
473 * parameter:
474 * urb USB request block
475 * urb->context = inbuf structure for controller state
476 */
477 static void read_ctrl_callback(struct urb *urb)
478 {
479 struct inbuf_t *inbuf = urb->context;
480 struct cardstate *cs = inbuf->cs;
481 struct bas_cardstate *ucs = cs->hw.bas;
482 int status = urb->status;
483 int have_data = 0;
484 unsigned numbytes;
485 int rc;
486
487 update_basstate(ucs, 0, BS_ATRDPEND);
488 wake_up(&ucs->waitqueue);
489
490 if (!ucs->rcvbuf_size) {
491 dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
492 return;
493 }
494
495 del_timer(&ucs->timer_cmd_in);
496
497 switch (status) {
498 case 0: /* normal completion */
499 numbytes = urb->actual_length;
500 if (unlikely(numbytes != ucs->rcvbuf_size)) {
501 dev_warn(cs->dev,
502 "control read: received %d chars, expected %d\n",
503 numbytes, ucs->rcvbuf_size);
504 if (numbytes > ucs->rcvbuf_size)
505 numbytes = ucs->rcvbuf_size;
506 }
507
508 /* copy received bytes to inbuf */
509 have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
510
511 if (unlikely(numbytes < ucs->rcvbuf_size)) {
512 /* incomplete - resubmit for remaining bytes */
513 ucs->rcvbuf_size -= numbytes;
514 ucs->retry_cmd_in = 0;
515 rc = atread_submit(cs, BAS_TIMEOUT);
516 if (rc >= 0 || rc == -ENODEV)
517 /* resubmitted or disconnected */
518 /* - bypass regular exit block */
519 return;
520 error_reset(cs);
521 }
522 break;
523
524 case -ENOENT: /* cancelled */
525 case -ECONNRESET: /* cancelled (async) */
526 case -EINPROGRESS: /* pending */
527 case -ENODEV: /* device removed */
528 case -ESHUTDOWN: /* device shut down */
529 /* no action necessary */
530 gig_dbg(DEBUG_USBREQ, "%s: %s",
531 __func__, get_usb_statmsg(status));
532 break;
533
534 default: /* severe trouble */
535 dev_warn(cs->dev, "control read: %s\n",
536 get_usb_statmsg(status));
537 if (ucs->retry_cmd_in++ < BAS_RETRY) {
538 dev_notice(cs->dev, "control read: retry %d\n",
539 ucs->retry_cmd_in);
540 rc = atread_submit(cs, BAS_TIMEOUT);
541 if (rc >= 0 || rc == -ENODEV)
542 /* resubmitted or disconnected */
543 /* - bypass regular exit block */
544 return;
545 } else {
546 dev_err(cs->dev,
547 "control read: giving up after %d tries\n",
548 ucs->retry_cmd_in);
549 }
550 error_reset(cs);
551 }
552
553 kfree(ucs->rcvbuf);
554 ucs->rcvbuf = NULL;
555 ucs->rcvbuf_size = 0;
556 if (have_data) {
557 gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
558 gigaset_schedule_event(cs);
559 }
560 }
561
562 /* atread_submit
563 * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
564 * parameters:
565 * cs controller state structure
566 * timeout timeout in 1/10 sec., 0: none
567 * return value:
568 * 0 on success
569 * -EBUSY if another request is pending
570 * any URB submission error code
571 */
572 static int atread_submit(struct cardstate *cs, int timeout)
573 {
574 struct bas_cardstate *ucs = cs->hw.bas;
575 int basstate;
576 int ret;
577
578 gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
579 ucs->rcvbuf_size);
580
581 basstate = update_basstate(ucs, BS_ATRDPEND, 0);
582 if (basstate & BS_ATRDPEND) {
583 dev_err(cs->dev,
584 "could not submit HD_READ_ATMESSAGE: URB busy\n");
585 return -EBUSY;
586 }
587
588 if (basstate & BS_SUSPEND) {
589 dev_notice(cs->dev,
590 "HD_READ_ATMESSAGE not submitted, "
591 "suspend in progress\n");
592 update_basstate(ucs, 0, BS_ATRDPEND);
593 /* treat like disconnect */
594 return -ENODEV;
595 }
596
597 ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
598 ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
599 ucs->dr_cmd_in.wValue = 0;
600 ucs->dr_cmd_in.wIndex = 0;
601 ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
602 usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
603 usb_rcvctrlpipe(ucs->udev, 0),
604 (unsigned char *) &ucs->dr_cmd_in,
605 ucs->rcvbuf, ucs->rcvbuf_size,
606 read_ctrl_callback, cs->inbuf);
607
608 ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC);
609 if (ret != 0) {
610 update_basstate(ucs, 0, BS_ATRDPEND);
611 dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
612 get_usb_rcmsg(ret));
613 return ret;
614 }
615
616 if (timeout > 0) {
617 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
618 ucs->timer_cmd_in.expires = jiffies + timeout * HZ / 10;
619 ucs->timer_cmd_in.data = (unsigned long) cs;
620 ucs->timer_cmd_in.function = cmd_in_timeout;
621 add_timer(&ucs->timer_cmd_in);
622 }
623 return 0;
624 }
625
626 /* read_int_callback
627 * USB completion handler for interrupt pipe input
628 * called by the USB subsystem in interrupt context
629 * parameter:
630 * urb USB request block
631 * urb->context = controller state structure
632 */
633 static void read_int_callback(struct urb *urb)
634 {
635 struct cardstate *cs = urb->context;
636 struct bas_cardstate *ucs = cs->hw.bas;
637 struct bc_state *bcs;
638 int status = urb->status;
639 unsigned long flags;
640 int rc;
641 unsigned l;
642 int channel;
643
644 switch (status) {
645 case 0: /* success */
646 break;
647 case -ENOENT: /* cancelled */
648 case -ECONNRESET: /* cancelled (async) */
649 case -EINPROGRESS: /* pending */
650 /* ignore silently */
651 gig_dbg(DEBUG_USBREQ, "%s: %s",
652 __func__, get_usb_statmsg(status));
653 return;
654 case -ENODEV: /* device removed */
655 case -ESHUTDOWN: /* device shut down */
656 gig_dbg(DEBUG_USBREQ, "%s: device disconnected", __func__);
657 return;
658 default: /* severe trouble */
659 dev_warn(cs->dev, "interrupt read: %s\n",
660 get_usb_statmsg(status));
661 goto resubmit;
662 }
663
664 /* drop incomplete packets even if the missing bytes wouldn't matter */
665 if (unlikely(urb->actual_length < IP_MSGSIZE)) {
666 dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
667 urb->actual_length);
668 goto resubmit;
669 }
670
671 l = (unsigned) ucs->int_in_buf[1] +
672 (((unsigned) ucs->int_in_buf[2]) << 8);
673
674 gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
675 urb->actual_length, (int)ucs->int_in_buf[0], l,
676 (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
677
678 channel = 0;
679
680 switch (ucs->int_in_buf[0]) {
681 case HD_DEVICE_INIT_OK:
682 update_basstate(ucs, BS_INIT, 0);
683 break;
684
685 case HD_READY_SEND_ATDATA:
686 del_timer(&ucs->timer_atrdy);
687 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
688 start_cbsend(cs);
689 break;
690
691 case HD_OPEN_B2CHANNEL_ACK:
692 ++channel;
693 case HD_OPEN_B1CHANNEL_ACK:
694 bcs = cs->bcs + channel;
695 update_basstate(ucs, BS_B1OPEN << channel, 0);
696 gigaset_bchannel_up(bcs);
697 break;
698
699 case HD_OPEN_ATCHANNEL_ACK:
700 update_basstate(ucs, BS_ATOPEN, 0);
701 start_cbsend(cs);
702 break;
703
704 case HD_CLOSE_B2CHANNEL_ACK:
705 ++channel;
706 case HD_CLOSE_B1CHANNEL_ACK:
707 bcs = cs->bcs + channel;
708 update_basstate(ucs, 0, BS_B1OPEN << channel);
709 stopurbs(bcs->hw.bas);
710 gigaset_bchannel_down(bcs);
711 break;
712
713 case HD_CLOSE_ATCHANNEL_ACK:
714 update_basstate(ucs, 0, BS_ATOPEN);
715 break;
716
717 case HD_B2_FLOW_CONTROL:
718 ++channel;
719 case HD_B1_FLOW_CONTROL:
720 bcs = cs->bcs + channel;
721 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
722 &bcs->hw.bas->corrbytes);
723 gig_dbg(DEBUG_ISO,
724 "Flow control (channel %d, sub %d): 0x%02x => %d",
725 channel, bcs->hw.bas->numsub, l,
726 atomic_read(&bcs->hw.bas->corrbytes));
727 break;
728
729 case HD_RECEIVEATDATA_ACK: /* AT response ready to be received */
730 if (!l) {
731 dev_warn(cs->dev,
732 "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
733 break;
734 }
735 spin_lock_irqsave(&cs->lock, flags);
736 if (ucs->rcvbuf_size) {
737 /* throw away previous buffer - we have no queue */
738 dev_err(cs->dev,
739 "receive AT data overrun, %d bytes lost\n",
740 ucs->rcvbuf_size);
741 kfree(ucs->rcvbuf);
742 ucs->rcvbuf_size = 0;
743 }
744 ucs->rcvbuf = kmalloc(l, GFP_ATOMIC);
745 if (ucs->rcvbuf == NULL) {
746 spin_unlock_irqrestore(&cs->lock, flags);
747 dev_err(cs->dev, "out of memory receiving AT data\n");
748 error_reset(cs);
749 break;
750 }
751 ucs->rcvbuf_size = l;
752 ucs->retry_cmd_in = 0;
753 rc = atread_submit(cs, BAS_TIMEOUT);
754 if (rc < 0) {
755 kfree(ucs->rcvbuf);
756 ucs->rcvbuf = NULL;
757 ucs->rcvbuf_size = 0;
758 if (rc != -ENODEV) {
759 spin_unlock_irqrestore(&cs->lock, flags);
760 error_reset(cs);
761 break;
762 }
763 }
764 spin_unlock_irqrestore(&cs->lock, flags);
765 break;
766
767 case HD_RESET_INTERRUPT_PIPE_ACK:
768 update_basstate(ucs, 0, BS_RESETTING);
769 dev_notice(cs->dev, "interrupt pipe reset\n");
770 break;
771
772 case HD_SUSPEND_END:
773 gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
774 break;
775
776 default:
777 dev_warn(cs->dev,
778 "unknown Gigaset signal 0x%02x (%u) ignored\n",
779 (int) ucs->int_in_buf[0], l);
780 }
781
782 check_pending(ucs);
783 wake_up(&ucs->waitqueue);
784
785 resubmit:
786 rc = usb_submit_urb(urb, GFP_ATOMIC);
787 if (unlikely(rc != 0 && rc != -ENODEV)) {
788 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
789 get_usb_rcmsg(rc));
790 error_reset(cs);
791 }
792 }
793
794 /* read_iso_callback
795 * USB completion handler for B channel isochronous input
796 * called by the USB subsystem in interrupt context
797 * parameter:
798 * urb USB request block of completed request
799 * urb->context = bc_state structure
800 */
801 static void read_iso_callback(struct urb *urb)
802 {
803 struct bc_state *bcs;
804 struct bas_bc_state *ubc;
805 int status = urb->status;
806 unsigned long flags;
807 int i, rc;
808
809 /* status codes not worth bothering the tasklet with */
810 if (unlikely(status == -ENOENT ||
811 status == -ECONNRESET ||
812 status == -EINPROGRESS ||
813 status == -ENODEV ||
814 status == -ESHUTDOWN)) {
815 gig_dbg(DEBUG_ISO, "%s: %s",
816 __func__, get_usb_statmsg(status));
817 return;
818 }
819
820 bcs = urb->context;
821 ubc = bcs->hw.bas;
822
823 spin_lock_irqsave(&ubc->isoinlock, flags);
824 if (likely(ubc->isoindone == NULL)) {
825 /* pass URB to tasklet */
826 ubc->isoindone = urb;
827 ubc->isoinstatus = status;
828 tasklet_hi_schedule(&ubc->rcvd_tasklet);
829 } else {
830 /* tasklet still busy, drop data and resubmit URB */
831 ubc->loststatus = status;
832 for (i = 0; i < BAS_NUMFRAMES; i++) {
833 ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
834 if (unlikely(urb->iso_frame_desc[i].status != 0 &&
835 urb->iso_frame_desc[i].status !=
836 -EINPROGRESS))
837 ubc->loststatus = urb->iso_frame_desc[i].status;
838 urb->iso_frame_desc[i].status = 0;
839 urb->iso_frame_desc[i].actual_length = 0;
840 }
841 if (likely(ubc->running)) {
842 /* urb->dev is clobbered by USB subsystem */
843 urb->dev = bcs->cs->hw.bas->udev;
844 urb->transfer_flags = URB_ISO_ASAP;
845 urb->number_of_packets = BAS_NUMFRAMES;
846 gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
847 __func__);
848 rc = usb_submit_urb(urb, GFP_ATOMIC);
849 if (unlikely(rc != 0 && rc != -ENODEV)) {
850 dev_err(bcs->cs->dev,
851 "could not resubmit isochronous read "
852 "URB: %s\n", get_usb_rcmsg(rc));
853 dump_urb(DEBUG_ISO, "isoc read", urb);
854 error_hangup(bcs);
855 }
856 }
857 }
858 spin_unlock_irqrestore(&ubc->isoinlock, flags);
859 }
860
861 /* write_iso_callback
862 * USB completion handler for B channel isochronous output
863 * called by the USB subsystem in interrupt context
864 * parameter:
865 * urb USB request block of completed request
866 * urb->context = isow_urbctx_t structure
867 */
868 static void write_iso_callback(struct urb *urb)
869 {
870 struct isow_urbctx_t *ucx;
871 struct bas_bc_state *ubc;
872 int status = urb->status;
873 unsigned long flags;
874
875 /* status codes not worth bothering the tasklet with */
876 if (unlikely(status == -ENOENT ||
877 status == -ECONNRESET ||
878 status == -EINPROGRESS ||
879 status == -ENODEV ||
880 status == -ESHUTDOWN)) {
881 gig_dbg(DEBUG_ISO, "%s: %s",
882 __func__, get_usb_statmsg(status));
883 return;
884 }
885
886 /* pass URB context to tasklet */
887 ucx = urb->context;
888 ubc = ucx->bcs->hw.bas;
889 ucx->status = status;
890
891 spin_lock_irqsave(&ubc->isooutlock, flags);
892 ubc->isooutovfl = ubc->isooutdone;
893 ubc->isooutdone = ucx;
894 spin_unlock_irqrestore(&ubc->isooutlock, flags);
895 tasklet_hi_schedule(&ubc->sent_tasklet);
896 }
897
898 /* starturbs
899 * prepare and submit USB request blocks for isochronous input and output
900 * argument:
901 * B channel control structure
902 * return value:
903 * 0 on success
904 * < 0 on error (no URBs submitted)
905 */
906 static int starturbs(struct bc_state *bcs)
907 {
908 struct bas_bc_state *ubc = bcs->hw.bas;
909 struct urb *urb;
910 int j, k;
911 int rc;
912
913 /* initialize L2 reception */
914 if (bcs->proto2 == L2_HDLC)
915 bcs->inputstate |= INS_flag_hunt;
916
917 /* submit all isochronous input URBs */
918 ubc->running = 1;
919 for (k = 0; k < BAS_INURBS; k++) {
920 urb = ubc->isoinurbs[k];
921 if (!urb) {
922 rc = -EFAULT;
923 goto error;
924 }
925
926 urb->dev = bcs->cs->hw.bas->udev;
927 urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
928 urb->transfer_flags = URB_ISO_ASAP;
929 urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
930 urb->transfer_buffer_length = BAS_INBUFSIZE;
931 urb->number_of_packets = BAS_NUMFRAMES;
932 urb->interval = BAS_FRAMETIME;
933 urb->complete = read_iso_callback;
934 urb->context = bcs;
935 for (j = 0; j < BAS_NUMFRAMES; j++) {
936 urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
937 urb->iso_frame_desc[j].length = BAS_MAXFRAME;
938 urb->iso_frame_desc[j].status = 0;
939 urb->iso_frame_desc[j].actual_length = 0;
940 }
941
942 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
943 rc = usb_submit_urb(urb, GFP_ATOMIC);
944 if (rc != 0)
945 goto error;
946 }
947
948 /* initialize L2 transmission */
949 gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
950
951 /* set up isochronous output URBs for flag idling */
952 for (k = 0; k < BAS_OUTURBS; ++k) {
953 urb = ubc->isoouturbs[k].urb;
954 if (!urb) {
955 rc = -EFAULT;
956 goto error;
957 }
958 urb->dev = bcs->cs->hw.bas->udev;
959 urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
960 urb->transfer_flags = URB_ISO_ASAP;
961 urb->transfer_buffer = ubc->isooutbuf->data;
962 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
963 urb->number_of_packets = BAS_NUMFRAMES;
964 urb->interval = BAS_FRAMETIME;
965 urb->complete = write_iso_callback;
966 urb->context = &ubc->isoouturbs[k];
967 for (j = 0; j < BAS_NUMFRAMES; ++j) {
968 urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
969 urb->iso_frame_desc[j].length = BAS_NORMFRAME;
970 urb->iso_frame_desc[j].status = 0;
971 urb->iso_frame_desc[j].actual_length = 0;
972 }
973 ubc->isoouturbs[k].limit = -1;
974 }
975
976 /* keep one URB free, submit the others */
977 for (k = 0; k < BAS_OUTURBS-1; ++k) {
978 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
979 rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
980 if (rc != 0)
981 goto error;
982 }
983 dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
984 ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS-1];
985 ubc->isooutdone = ubc->isooutovfl = NULL;
986 return 0;
987 error:
988 stopurbs(ubc);
989 return rc;
990 }
991
992 /* stopurbs
993 * cancel the USB request blocks for isochronous input and output
994 * errors are silently ignored
995 * argument:
996 * B channel control structure
997 */
998 static void stopurbs(struct bas_bc_state *ubc)
999 {
1000 int k, rc;
1001
1002 ubc->running = 0;
1003
1004 for (k = 0; k < BAS_INURBS; ++k) {
1005 rc = usb_unlink_urb(ubc->isoinurbs[k]);
1006 gig_dbg(DEBUG_ISO,
1007 "%s: isoc input URB %d unlinked, result = %s",
1008 __func__, k, get_usb_rcmsg(rc));
1009 }
1010
1011 for (k = 0; k < BAS_OUTURBS; ++k) {
1012 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1013 gig_dbg(DEBUG_ISO,
1014 "%s: isoc output URB %d unlinked, result = %s",
1015 __func__, k, get_usb_rcmsg(rc));
1016 }
1017 }
1018
1019 /* Isochronous Write - Bottom Half */
1020 /* =============================== */
1021
1022 /* submit_iso_write_urb
1023 * fill and submit the next isochronous write URB
1024 * parameters:
1025 * ucx context structure containing URB
1026 * return value:
1027 * number of frames submitted in URB
1028 * 0 if URB not submitted because no data available (isooutbuf busy)
1029 * error code < 0 on error
1030 */
1031 static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
1032 {
1033 struct urb *urb = ucx->urb;
1034 struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1035 struct usb_iso_packet_descriptor *ifd;
1036 int corrbytes, nframe, rc;
1037
1038 /* urb->dev is clobbered by USB subsystem */
1039 urb->dev = ucx->bcs->cs->hw.bas->udev;
1040 urb->transfer_flags = URB_ISO_ASAP;
1041 urb->transfer_buffer = ubc->isooutbuf->data;
1042 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1043
1044 for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1045 ifd = &urb->iso_frame_desc[nframe];
1046
1047 /* compute frame length according to flow control */
1048 ifd->length = BAS_NORMFRAME;
1049 corrbytes = atomic_read(&ubc->corrbytes);
1050 if (corrbytes != 0) {
1051 gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1052 __func__, corrbytes);
1053 if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1054 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1055 else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1056 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1057 ifd->length += corrbytes;
1058 atomic_add(-corrbytes, &ubc->corrbytes);
1059 }
1060
1061 /* retrieve block of data to send */
1062 rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
1063 if (rc < 0) {
1064 if (rc == -EBUSY) {
1065 gig_dbg(DEBUG_ISO,
1066 "%s: buffer busy at frame %d",
1067 __func__, nframe);
1068 /* tasklet will be restarted from
1069 gigaset_isoc_send_skb() */
1070 } else {
1071 dev_err(ucx->bcs->cs->dev,
1072 "%s: buffer error %d at frame %d\n",
1073 __func__, rc, nframe);
1074 return rc;
1075 }
1076 break;
1077 }
1078 ifd->offset = rc;
1079 ucx->limit = ubc->isooutbuf->nextread;
1080 ifd->status = 0;
1081 ifd->actual_length = 0;
1082 }
1083 if (unlikely(nframe == 0))
1084 return 0; /* no data to send */
1085 urb->number_of_packets = nframe;
1086
1087 rc = usb_submit_urb(urb, GFP_ATOMIC);
1088 if (unlikely(rc)) {
1089 if (rc == -ENODEV)
1090 /* device removed - give up silently */
1091 gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1092 else
1093 dev_err(ucx->bcs->cs->dev,
1094 "could not submit isochronous write URB: %s\n",
1095 get_usb_rcmsg(rc));
1096 return rc;
1097 }
1098 ++ubc->numsub;
1099 return nframe;
1100 }
1101
1102 /* write_iso_tasklet
1103 * tasklet scheduled when an isochronous output URB from the Gigaset device
1104 * has completed
1105 * parameter:
1106 * data B channel state structure
1107 */
1108 static void write_iso_tasklet(unsigned long data)
1109 {
1110 struct bc_state *bcs = (struct bc_state *) data;
1111 struct bas_bc_state *ubc = bcs->hw.bas;
1112 struct cardstate *cs = bcs->cs;
1113 struct isow_urbctx_t *done, *next, *ovfl;
1114 struct urb *urb;
1115 int status;
1116 struct usb_iso_packet_descriptor *ifd;
1117 int offset;
1118 unsigned long flags;
1119 int i;
1120 struct sk_buff *skb;
1121 int len;
1122 int rc;
1123
1124 /* loop while completed URBs arrive in time */
1125 for (;;) {
1126 if (unlikely(!(ubc->running))) {
1127 gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1128 return;
1129 }
1130
1131 /* retrieve completed URBs */
1132 spin_lock_irqsave(&ubc->isooutlock, flags);
1133 done = ubc->isooutdone;
1134 ubc->isooutdone = NULL;
1135 ovfl = ubc->isooutovfl;
1136 ubc->isooutovfl = NULL;
1137 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1138 if (ovfl) {
1139 dev_err(cs->dev, "isochronous write buffer underrun\n");
1140 error_hangup(bcs);
1141 break;
1142 }
1143 if (!done)
1144 break;
1145
1146 /* submit free URB if available */
1147 spin_lock_irqsave(&ubc->isooutlock, flags);
1148 next = ubc->isooutfree;
1149 ubc->isooutfree = NULL;
1150 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1151 if (next) {
1152 rc = submit_iso_write_urb(next);
1153 if (unlikely(rc <= 0 && rc != -ENODEV)) {
1154 /* could not submit URB, put it back */
1155 spin_lock_irqsave(&ubc->isooutlock, flags);
1156 if (ubc->isooutfree == NULL) {
1157 ubc->isooutfree = next;
1158 next = NULL;
1159 }
1160 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1161 if (next) {
1162 /* couldn't put it back */
1163 dev_err(cs->dev,
1164 "losing isochronous write URB\n");
1165 error_hangup(bcs);
1166 }
1167 }
1168 }
1169
1170 /* process completed URB */
1171 urb = done->urb;
1172 status = done->status;
1173 switch (status) {
1174 case -EXDEV: /* partial completion */
1175 gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1176 __func__);
1177 /* fall through - what's the difference anyway? */
1178 case 0: /* normal completion */
1179 /* inspect individual frames
1180 * assumptions (for lack of documentation):
1181 * - actual_length bytes of first frame in error are
1182 * successfully sent
1183 * - all following frames are not sent at all
1184 */
1185 offset = done->limit; /* default (no error) */
1186 for (i = 0; i < BAS_NUMFRAMES; i++) {
1187 ifd = &urb->iso_frame_desc[i];
1188 if (ifd->status ||
1189 ifd->actual_length != ifd->length) {
1190 dev_warn(cs->dev,
1191 "isochronous write: frame %d: %s, "
1192 "only %d of %d bytes sent\n",
1193 i, get_usb_statmsg(ifd->status),
1194 ifd->actual_length, ifd->length);
1195 offset = (ifd->offset +
1196 ifd->actual_length)
1197 % BAS_OUTBUFSIZE;
1198 break;
1199 }
1200 }
1201 #ifdef CONFIG_GIGASET_DEBUG
1202 /* check assumption on remaining frames */
1203 for (; i < BAS_NUMFRAMES; i++) {
1204 ifd = &urb->iso_frame_desc[i];
1205 if (ifd->status != -EINPROGRESS
1206 || ifd->actual_length != 0) {
1207 dev_warn(cs->dev,
1208 "isochronous write: frame %d: %s, "
1209 "%d of %d bytes sent\n",
1210 i, get_usb_statmsg(ifd->status),
1211 ifd->actual_length, ifd->length);
1212 offset = (ifd->offset +
1213 ifd->actual_length)
1214 % BAS_OUTBUFSIZE;
1215 break;
1216 }
1217 }
1218 #endif
1219 break;
1220 case -EPIPE: /* stall - probably underrun */
1221 dev_err(cs->dev, "isochronous write stalled\n");
1222 error_hangup(bcs);
1223 break;
1224 default: /* severe trouble */
1225 dev_warn(cs->dev, "isochronous write: %s\n",
1226 get_usb_statmsg(status));
1227 }
1228
1229 /* mark the write buffer area covered by this URB as free */
1230 if (done->limit >= 0)
1231 ubc->isooutbuf->read = done->limit;
1232
1233 /* mark URB as free */
1234 spin_lock_irqsave(&ubc->isooutlock, flags);
1235 next = ubc->isooutfree;
1236 ubc->isooutfree = done;
1237 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1238 if (next) {
1239 /* only one URB still active - resubmit one */
1240 rc = submit_iso_write_urb(next);
1241 if (unlikely(rc <= 0 && rc != -ENODEV)) {
1242 /* couldn't submit */
1243 error_hangup(bcs);
1244 }
1245 }
1246 }
1247
1248 /* process queued SKBs */
1249 while ((skb = skb_dequeue(&bcs->squeue))) {
1250 /* copy to output buffer, doing L2 encapsulation */
1251 len = skb->len;
1252 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1253 /* insufficient buffer space, push back onto queue */
1254 skb_queue_head(&bcs->squeue, skb);
1255 gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1256 __func__, skb_queue_len(&bcs->squeue));
1257 break;
1258 }
1259 skb_pull(skb, len);
1260 gigaset_skb_sent(bcs, skb);
1261 dev_kfree_skb_any(skb);
1262 }
1263 }
1264
1265 /* Isochronous Read - Bottom Half */
1266 /* ============================== */
1267
1268 /* read_iso_tasklet
1269 * tasklet scheduled when an isochronous input URB from the Gigaset device
1270 * has completed
1271 * parameter:
1272 * data B channel state structure
1273 */
1274 static void read_iso_tasklet(unsigned long data)
1275 {
1276 struct bc_state *bcs = (struct bc_state *) data;
1277 struct bas_bc_state *ubc = bcs->hw.bas;
1278 struct cardstate *cs = bcs->cs;
1279 struct urb *urb;
1280 int status;
1281 char *rcvbuf;
1282 unsigned long flags;
1283 int totleft, numbytes, offset, frame, rc;
1284
1285 /* loop while more completed URBs arrive in the meantime */
1286 for (;;) {
1287 /* retrieve URB */
1288 spin_lock_irqsave(&ubc->isoinlock, flags);
1289 urb = ubc->isoindone;
1290 if (!urb) {
1291 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1292 return;
1293 }
1294 status = ubc->isoinstatus;
1295 ubc->isoindone = NULL;
1296 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1297 dev_warn(cs->dev,
1298 "isochronous read overrun, "
1299 "dropped URB with status: %s, %d bytes lost\n",
1300 get_usb_statmsg(ubc->loststatus),
1301 ubc->isoinlost);
1302 ubc->loststatus = -EINPROGRESS;
1303 }
1304 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1305
1306 if (unlikely(!(ubc->running))) {
1307 gig_dbg(DEBUG_ISO,
1308 "%s: channel not running, "
1309 "dropped URB with status: %s",
1310 __func__, get_usb_statmsg(status));
1311 return;
1312 }
1313
1314 switch (status) {
1315 case 0: /* normal completion */
1316 break;
1317 case -EXDEV: /* inspect individual frames
1318 (we do that anyway) */
1319 gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1320 __func__);
1321 break;
1322 case -ENOENT:
1323 case -ECONNRESET:
1324 case -EINPROGRESS:
1325 gig_dbg(DEBUG_ISO, "%s: %s",
1326 __func__, get_usb_statmsg(status));
1327 continue; /* -> skip */
1328 case -EPIPE:
1329 dev_err(cs->dev, "isochronous read stalled\n");
1330 error_hangup(bcs);
1331 continue; /* -> skip */
1332 default: /* severe trouble */
1333 dev_warn(cs->dev, "isochronous read: %s\n",
1334 get_usb_statmsg(status));
1335 goto error;
1336 }
1337
1338 rcvbuf = urb->transfer_buffer;
1339 totleft = urb->actual_length;
1340 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1341 numbytes = urb->iso_frame_desc[frame].actual_length;
1342 if (unlikely(urb->iso_frame_desc[frame].status))
1343 dev_warn(cs->dev,
1344 "isochronous read: frame %d[%d]: %s\n",
1345 frame, numbytes,
1346 get_usb_statmsg(
1347 urb->iso_frame_desc[frame].status));
1348 if (unlikely(numbytes > BAS_MAXFRAME))
1349 dev_warn(cs->dev,
1350 "isochronous read: frame %d: "
1351 "numbytes (%d) > BAS_MAXFRAME\n",
1352 frame, numbytes);
1353 if (unlikely(numbytes > totleft)) {
1354 dev_warn(cs->dev,
1355 "isochronous read: frame %d: "
1356 "numbytes (%d) > totleft (%d)\n",
1357 frame, numbytes, totleft);
1358 numbytes = totleft;
1359 }
1360 offset = urb->iso_frame_desc[frame].offset;
1361 if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1362 dev_warn(cs->dev,
1363 "isochronous read: frame %d: "
1364 "offset (%d) + numbytes (%d) "
1365 "> BAS_INBUFSIZE\n",
1366 frame, offset, numbytes);
1367 numbytes = BAS_INBUFSIZE - offset;
1368 }
1369 gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1370 totleft -= numbytes;
1371 }
1372 if (unlikely(totleft > 0))
1373 dev_warn(cs->dev,
1374 "isochronous read: %d data bytes missing\n",
1375 totleft);
1376
1377 error:
1378 /* URB processed, resubmit */
1379 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1380 urb->iso_frame_desc[frame].status = 0;
1381 urb->iso_frame_desc[frame].actual_length = 0;
1382 }
1383 /* urb->dev is clobbered by USB subsystem */
1384 urb->dev = bcs->cs->hw.bas->udev;
1385 urb->transfer_flags = URB_ISO_ASAP;
1386 urb->number_of_packets = BAS_NUMFRAMES;
1387 rc = usb_submit_urb(urb, GFP_ATOMIC);
1388 if (unlikely(rc != 0 && rc != -ENODEV)) {
1389 dev_err(cs->dev,
1390 "could not resubmit isochronous read URB: %s\n",
1391 get_usb_rcmsg(rc));
1392 dump_urb(DEBUG_ISO, "resubmit iso read", urb);
1393 error_hangup(bcs);
1394 }
1395 }
1396 }
1397
1398 /* Channel Operations */
1399 /* ================== */
1400
1401 /* req_timeout
1402 * timeout routine for control output request
1403 * argument:
1404 * B channel control structure
1405 */
1406 static void req_timeout(unsigned long data)
1407 {
1408 struct bc_state *bcs = (struct bc_state *) data;
1409 struct bas_cardstate *ucs = bcs->cs->hw.bas;
1410 int pending;
1411 unsigned long flags;
1412
1413 check_pending(ucs);
1414
1415 spin_lock_irqsave(&ucs->lock, flags);
1416 pending = ucs->pending;
1417 ucs->pending = 0;
1418 spin_unlock_irqrestore(&ucs->lock, flags);
1419
1420 switch (pending) {
1421 case 0: /* no pending request */
1422 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1423 break;
1424
1425 case HD_OPEN_ATCHANNEL:
1426 dev_err(bcs->cs->dev, "timeout opening AT channel\n");
1427 error_reset(bcs->cs);
1428 break;
1429
1430 case HD_OPEN_B2CHANNEL:
1431 case HD_OPEN_B1CHANNEL:
1432 dev_err(bcs->cs->dev, "timeout opening channel %d\n",
1433 bcs->channel + 1);
1434 error_hangup(bcs);
1435 break;
1436
1437 case HD_CLOSE_ATCHANNEL:
1438 dev_err(bcs->cs->dev, "timeout closing AT channel\n");
1439 error_reset(bcs->cs);
1440 break;
1441
1442 case HD_CLOSE_B2CHANNEL:
1443 case HD_CLOSE_B1CHANNEL:
1444 dev_err(bcs->cs->dev, "timeout closing channel %d\n",
1445 bcs->channel + 1);
1446 error_reset(bcs->cs);
1447 break;
1448
1449 case HD_RESET_INTERRUPT_PIPE:
1450 /* error recovery escalation */
1451 dev_err(bcs->cs->dev,
1452 "reset interrupt pipe timeout, attempting USB reset\n");
1453 usb_queue_reset_device(bcs->cs->hw.bas->interface);
1454 break;
1455
1456 default:
1457 dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
1458 pending);
1459 }
1460
1461 wake_up(&ucs->waitqueue);
1462 }
1463
1464 /* write_ctrl_callback
1465 * USB completion handler for control pipe output
1466 * called by the USB subsystem in interrupt context
1467 * parameter:
1468 * urb USB request block of completed request
1469 * urb->context = hardware specific controller state structure
1470 */
1471 static void write_ctrl_callback(struct urb *urb)
1472 {
1473 struct bas_cardstate *ucs = urb->context;
1474 int status = urb->status;
1475 int rc;
1476 unsigned long flags;
1477
1478 /* check status */
1479 switch (status) {
1480 case 0: /* normal completion */
1481 spin_lock_irqsave(&ucs->lock, flags);
1482 switch (ucs->pending) {
1483 case HD_DEVICE_INIT_ACK: /* no reply expected */
1484 del_timer(&ucs->timer_ctrl);
1485 ucs->pending = 0;
1486 break;
1487 }
1488 spin_unlock_irqrestore(&ucs->lock, flags);
1489 return;
1490
1491 case -ENOENT: /* cancelled */
1492 case -ECONNRESET: /* cancelled (async) */
1493 case -EINPROGRESS: /* pending */
1494 case -ENODEV: /* device removed */
1495 case -ESHUTDOWN: /* device shut down */
1496 /* ignore silently */
1497 gig_dbg(DEBUG_USBREQ, "%s: %s",
1498 __func__, get_usb_statmsg(status));
1499 break;
1500
1501 default: /* any failure */
1502 /* don't retry if suspend requested */
1503 if (++ucs->retry_ctrl > BAS_RETRY ||
1504 (ucs->basstate & BS_SUSPEND)) {
1505 dev_err(&ucs->interface->dev,
1506 "control request 0x%02x failed: %s\n",
1507 ucs->dr_ctrl.bRequest,
1508 get_usb_statmsg(status));
1509 break; /* give up */
1510 }
1511 dev_notice(&ucs->interface->dev,
1512 "control request 0x%02x: %s, retry %d\n",
1513 ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1514 ucs->retry_ctrl);
1515 /* urb->dev is clobbered by USB subsystem */
1516 urb->dev = ucs->udev;
1517 rc = usb_submit_urb(urb, GFP_ATOMIC);
1518 if (unlikely(rc)) {
1519 dev_err(&ucs->interface->dev,
1520 "could not resubmit request 0x%02x: %s\n",
1521 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1522 break;
1523 }
1524 /* resubmitted */
1525 return;
1526 }
1527
1528 /* failed, clear pending request */
1529 spin_lock_irqsave(&ucs->lock, flags);
1530 del_timer(&ucs->timer_ctrl);
1531 ucs->pending = 0;
1532 spin_unlock_irqrestore(&ucs->lock, flags);
1533 wake_up(&ucs->waitqueue);
1534 }
1535
1536 /* req_submit
1537 * submit a control output request without message buffer to the Gigaset base
1538 * and optionally start a timeout
1539 * parameters:
1540 * bcs B channel control structure
1541 * req control request code (HD_*)
1542 * val control request parameter value (set to 0 if unused)
1543 * timeout timeout in seconds (0: no timeout)
1544 * return value:
1545 * 0 on success
1546 * -EBUSY if another request is pending
1547 * any URB submission error code
1548 */
1549 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1550 {
1551 struct bas_cardstate *ucs = bcs->cs->hw.bas;
1552 int ret;
1553 unsigned long flags;
1554
1555 gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1556
1557 spin_lock_irqsave(&ucs->lock, flags);
1558 if (ucs->pending) {
1559 spin_unlock_irqrestore(&ucs->lock, flags);
1560 dev_err(bcs->cs->dev,
1561 "submission of request 0x%02x failed: "
1562 "request 0x%02x still pending\n",
1563 req, ucs->pending);
1564 return -EBUSY;
1565 }
1566
1567 ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1568 ucs->dr_ctrl.bRequest = req;
1569 ucs->dr_ctrl.wValue = cpu_to_le16(val);
1570 ucs->dr_ctrl.wIndex = 0;
1571 ucs->dr_ctrl.wLength = 0;
1572 usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1573 usb_sndctrlpipe(ucs->udev, 0),
1574 (unsigned char *) &ucs->dr_ctrl, NULL, 0,
1575 write_ctrl_callback, ucs);
1576 ucs->retry_ctrl = 0;
1577 ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1578 if (unlikely(ret)) {
1579 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1580 req, get_usb_rcmsg(ret));
1581 spin_unlock_irqrestore(&ucs->lock, flags);
1582 return ret;
1583 }
1584 ucs->pending = req;
1585
1586 if (timeout > 0) {
1587 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1588 ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
1589 ucs->timer_ctrl.data = (unsigned long) bcs;
1590 ucs->timer_ctrl.function = req_timeout;
1591 add_timer(&ucs->timer_ctrl);
1592 }
1593
1594 spin_unlock_irqrestore(&ucs->lock, flags);
1595 return 0;
1596 }
1597
1598 /* gigaset_init_bchannel
1599 * called by common.c to connect a B channel
1600 * initialize isochronous I/O and tell the Gigaset base to open the channel
1601 * argument:
1602 * B channel control structure
1603 * return value:
1604 * 0 on success, error code < 0 on error
1605 */
1606 static int gigaset_init_bchannel(struct bc_state *bcs)
1607 {
1608 struct cardstate *cs = bcs->cs;
1609 int req, ret;
1610 unsigned long flags;
1611
1612 spin_lock_irqsave(&cs->lock, flags);
1613 if (unlikely(!cs->connected)) {
1614 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1615 spin_unlock_irqrestore(&cs->lock, flags);
1616 return -ENODEV;
1617 }
1618
1619 if (cs->hw.bas->basstate & BS_SUSPEND) {
1620 dev_notice(cs->dev,
1621 "not starting isochronous I/O, "
1622 "suspend in progress\n");
1623 spin_unlock_irqrestore(&cs->lock, flags);
1624 return -EHOSTUNREACH;
1625 }
1626
1627 ret = starturbs(bcs);
1628 if (ret < 0) {
1629 dev_err(cs->dev,
1630 "could not start isochronous I/O for channel B%d: %s\n",
1631 bcs->channel + 1,
1632 ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1633 if (ret != -ENODEV)
1634 error_hangup(bcs);
1635 spin_unlock_irqrestore(&cs->lock, flags);
1636 return ret;
1637 }
1638
1639 req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1640 ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1641 if (ret < 0) {
1642 dev_err(cs->dev, "could not open channel B%d\n",
1643 bcs->channel + 1);
1644 stopurbs(bcs->hw.bas);
1645 if (ret != -ENODEV)
1646 error_hangup(bcs);
1647 }
1648
1649 spin_unlock_irqrestore(&cs->lock, flags);
1650 return ret;
1651 }
1652
1653 /* gigaset_close_bchannel
1654 * called by common.c to disconnect a B channel
1655 * tell the Gigaset base to close the channel
1656 * stopping isochronous I/O and LL notification will be done when the
1657 * acknowledgement for the close arrives
1658 * argument:
1659 * B channel control structure
1660 * return value:
1661 * 0 on success, error code < 0 on error
1662 */
1663 static int gigaset_close_bchannel(struct bc_state *bcs)
1664 {
1665 struct cardstate *cs = bcs->cs;
1666 int req, ret;
1667 unsigned long flags;
1668
1669 spin_lock_irqsave(&cs->lock, flags);
1670 if (unlikely(!cs->connected)) {
1671 spin_unlock_irqrestore(&cs->lock, flags);
1672 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1673 return -ENODEV;
1674 }
1675
1676 if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1677 /* channel not running: just signal common.c */
1678 spin_unlock_irqrestore(&cs->lock, flags);
1679 gigaset_bchannel_down(bcs);
1680 return 0;
1681 }
1682
1683 /* channel running: tell device to close it */
1684 req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1685 ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1686 if (ret < 0)
1687 dev_err(cs->dev, "closing channel B%d failed\n",
1688 bcs->channel + 1);
1689
1690 spin_unlock_irqrestore(&cs->lock, flags);
1691 return ret;
1692 }
1693
1694 /* Device Operations */
1695 /* ================= */
1696
1697 /* complete_cb
1698 * unqueue first command buffer from queue, waking any sleepers
1699 * must be called with cs->cmdlock held
1700 * parameter:
1701 * cs controller state structure
1702 */
1703 static void complete_cb(struct cardstate *cs)
1704 {
1705 struct cmdbuf_t *cb = cs->cmdbuf;
1706
1707 /* unqueue completed buffer */
1708 cs->cmdbytes -= cs->curlen;
1709 gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD,
1710 "write_command: sent %u bytes, %u left",
1711 cs->curlen, cs->cmdbytes);
1712 if (cb->next != NULL) {
1713 cs->cmdbuf = cb->next;
1714 cs->cmdbuf->prev = NULL;
1715 cs->curlen = cs->cmdbuf->len;
1716 } else {
1717 cs->cmdbuf = NULL;
1718 cs->lastcmdbuf = NULL;
1719 cs->curlen = 0;
1720 }
1721
1722 if (cb->wake_tasklet)
1723 tasklet_schedule(cb->wake_tasklet);
1724
1725 kfree(cb);
1726 }
1727
1728 /* write_command_callback
1729 * USB completion handler for AT command transmission
1730 * called by the USB subsystem in interrupt context
1731 * parameter:
1732 * urb USB request block of completed request
1733 * urb->context = controller state structure
1734 */
1735 static void write_command_callback(struct urb *urb)
1736 {
1737 struct cardstate *cs = urb->context;
1738 struct bas_cardstate *ucs = cs->hw.bas;
1739 int status = urb->status;
1740 unsigned long flags;
1741
1742 update_basstate(ucs, 0, BS_ATWRPEND);
1743 wake_up(&ucs->waitqueue);
1744
1745 /* check status */
1746 switch (status) {
1747 case 0: /* normal completion */
1748 break;
1749 case -ENOENT: /* cancelled */
1750 case -ECONNRESET: /* cancelled (async) */
1751 case -EINPROGRESS: /* pending */
1752 case -ENODEV: /* device removed */
1753 case -ESHUTDOWN: /* device shut down */
1754 /* ignore silently */
1755 gig_dbg(DEBUG_USBREQ, "%s: %s",
1756 __func__, get_usb_statmsg(status));
1757 return;
1758 default: /* any failure */
1759 if (++ucs->retry_cmd_out > BAS_RETRY) {
1760 dev_warn(cs->dev,
1761 "command write: %s, "
1762 "giving up after %d retries\n",
1763 get_usb_statmsg(status),
1764 ucs->retry_cmd_out);
1765 break;
1766 }
1767 if (ucs->basstate & BS_SUSPEND) {
1768 dev_warn(cs->dev,
1769 "command write: %s, "
1770 "won't retry - suspend requested\n",
1771 get_usb_statmsg(status));
1772 break;
1773 }
1774 if (cs->cmdbuf == NULL) {
1775 dev_warn(cs->dev,
1776 "command write: %s, "
1777 "cannot retry - cmdbuf gone\n",
1778 get_usb_statmsg(status));
1779 break;
1780 }
1781 dev_notice(cs->dev, "command write: %s, retry %d\n",
1782 get_usb_statmsg(status), ucs->retry_cmd_out);
1783 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1784 /* resubmitted - bypass regular exit block */
1785 return;
1786 /* command send failed, assume base still waiting */
1787 update_basstate(ucs, BS_ATREADY, 0);
1788 }
1789
1790 spin_lock_irqsave(&cs->cmdlock, flags);
1791 if (cs->cmdbuf != NULL)
1792 complete_cb(cs);
1793 spin_unlock_irqrestore(&cs->cmdlock, flags);
1794 }
1795
1796 /* atrdy_timeout
1797 * timeout routine for AT command transmission
1798 * argument:
1799 * controller state structure
1800 */
1801 static void atrdy_timeout(unsigned long data)
1802 {
1803 struct cardstate *cs = (struct cardstate *) data;
1804 struct bas_cardstate *ucs = cs->hw.bas;
1805
1806 dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1807
1808 /* fake the missing signal - what else can I do? */
1809 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1810 start_cbsend(cs);
1811 }
1812
1813 /* atwrite_submit
1814 * submit an HD_WRITE_ATMESSAGE command URB
1815 * parameters:
1816 * cs controller state structure
1817 * buf buffer containing command to send
1818 * len length of command to send
1819 * return value:
1820 * 0 on success
1821 * -EBUSY if another request is pending
1822 * any URB submission error code
1823 */
1824 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1825 {
1826 struct bas_cardstate *ucs = cs->hw.bas;
1827 int rc;
1828
1829 gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1830
1831 if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1832 dev_err(cs->dev,
1833 "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1834 return -EBUSY;
1835 }
1836
1837 ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1838 ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1839 ucs->dr_cmd_out.wValue = 0;
1840 ucs->dr_cmd_out.wIndex = 0;
1841 ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1842 usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1843 usb_sndctrlpipe(ucs->udev, 0),
1844 (unsigned char *) &ucs->dr_cmd_out, buf, len,
1845 write_command_callback, cs);
1846 rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1847 if (unlikely(rc)) {
1848 update_basstate(ucs, 0, BS_ATWRPEND);
1849 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1850 get_usb_rcmsg(rc));
1851 return rc;
1852 }
1853
1854 /* submitted successfully, start timeout if necessary */
1855 if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1856 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1857 ATRDY_TIMEOUT);
1858 ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
1859 ucs->timer_atrdy.data = (unsigned long) cs;
1860 ucs->timer_atrdy.function = atrdy_timeout;
1861 add_timer(&ucs->timer_atrdy);
1862 }
1863 return 0;
1864 }
1865
1866 /* start_cbsend
1867 * start transmission of AT command queue if necessary
1868 * parameter:
1869 * cs controller state structure
1870 * return value:
1871 * 0 on success
1872 * error code < 0 on error
1873 */
1874 static int start_cbsend(struct cardstate *cs)
1875 {
1876 struct cmdbuf_t *cb;
1877 struct bas_cardstate *ucs = cs->hw.bas;
1878 unsigned long flags;
1879 int rc;
1880 int retval = 0;
1881
1882 /* check if suspend requested */
1883 if (ucs->basstate & BS_SUSPEND) {
1884 gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "suspending");
1885 return -EHOSTUNREACH;
1886 }
1887
1888 /* check if AT channel is open */
1889 if (!(ucs->basstate & BS_ATOPEN)) {
1890 gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "AT channel not open");
1891 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1892 if (rc < 0) {
1893 /* flush command queue */
1894 spin_lock_irqsave(&cs->cmdlock, flags);
1895 while (cs->cmdbuf != NULL)
1896 complete_cb(cs);
1897 spin_unlock_irqrestore(&cs->cmdlock, flags);
1898 }
1899 return rc;
1900 }
1901
1902 /* try to send first command in queue */
1903 spin_lock_irqsave(&cs->cmdlock, flags);
1904
1905 while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1906 ucs->retry_cmd_out = 0;
1907 rc = atwrite_submit(cs, cb->buf, cb->len);
1908 if (unlikely(rc)) {
1909 retval = rc;
1910 complete_cb(cs);
1911 }
1912 }
1913
1914 spin_unlock_irqrestore(&cs->cmdlock, flags);
1915 return retval;
1916 }
1917
1918 /* gigaset_write_cmd
1919 * This function is called by the device independent part of the driver
1920 * to transmit an AT command string to the Gigaset device.
1921 * It encapsulates the device specific method for transmission over the
1922 * direct USB connection to the base.
1923 * The command string is added to the queue of commands to send, and
1924 * USB transmission is started if necessary.
1925 * parameters:
1926 * cs controller state structure
1927 * buf command string to send
1928 * len number of bytes to send (max. IF_WRITEBUF)
1929 * wake_tasklet tasklet to run when transmission is completed
1930 * (NULL if none)
1931 * return value:
1932 * number of bytes queued on success
1933 * error code < 0 on error
1934 */
1935 static int gigaset_write_cmd(struct cardstate *cs,
1936 const unsigned char *buf, int len,
1937 struct tasklet_struct *wake_tasklet)
1938 {
1939 struct cmdbuf_t *cb;
1940 unsigned long flags;
1941 int rc;
1942
1943 gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1944 DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1945 "CMD Transmit", len, buf);
1946
1947 if (len <= 0) {
1948 /* nothing to do */
1949 rc = 0;
1950 goto notqueued;
1951 }
1952
1953 /* translate "+++" escape sequence sent as a single separate command
1954 * into "close AT channel" command for error recovery
1955 * The next command will reopen the AT channel automatically.
1956 */
1957 if (len == 3 && !memcmp(buf, "+++", 3)) {
1958 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
1959 goto notqueued;
1960 }
1961
1962 if (len > IF_WRITEBUF)
1963 len = IF_WRITEBUF;
1964 cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC);
1965 if (!cb) {
1966 dev_err(cs->dev, "%s: out of memory\n", __func__);
1967 rc = -ENOMEM;
1968 goto notqueued;
1969 }
1970
1971 memcpy(cb->buf, buf, len);
1972 cb->len = len;
1973 cb->offset = 0;
1974 cb->next = NULL;
1975 cb->wake_tasklet = wake_tasklet;
1976
1977 spin_lock_irqsave(&cs->cmdlock, flags);
1978 cb->prev = cs->lastcmdbuf;
1979 if (cs->lastcmdbuf)
1980 cs->lastcmdbuf->next = cb;
1981 else {
1982 cs->cmdbuf = cb;
1983 cs->curlen = len;
1984 }
1985 cs->cmdbytes += len;
1986 cs->lastcmdbuf = cb;
1987 spin_unlock_irqrestore(&cs->cmdlock, flags);
1988
1989 spin_lock_irqsave(&cs->lock, flags);
1990 if (unlikely(!cs->connected)) {
1991 spin_unlock_irqrestore(&cs->lock, flags);
1992 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1993 /* flush command queue */
1994 spin_lock_irqsave(&cs->cmdlock, flags);
1995 while (cs->cmdbuf != NULL)
1996 complete_cb(cs);
1997 spin_unlock_irqrestore(&cs->cmdlock, flags);
1998 return -ENODEV;
1999 }
2000 rc = start_cbsend(cs);
2001 spin_unlock_irqrestore(&cs->lock, flags);
2002 return rc < 0 ? rc : len;
2003
2004 notqueued: /* request handled without queuing */
2005 if (wake_tasklet)
2006 tasklet_schedule(wake_tasklet);
2007 return rc;
2008 }
2009
2010 /* gigaset_write_room
2011 * tty_driver.write_room interface routine
2012 * return number of characters the driver will accept to be written via
2013 * gigaset_write_cmd
2014 * parameter:
2015 * controller state structure
2016 * return value:
2017 * number of characters
2018 */
2019 static int gigaset_write_room(struct cardstate *cs)
2020 {
2021 return IF_WRITEBUF;
2022 }
2023
2024 /* gigaset_chars_in_buffer
2025 * tty_driver.chars_in_buffer interface routine
2026 * return number of characters waiting to be sent
2027 * parameter:
2028 * controller state structure
2029 * return value:
2030 * number of characters
2031 */
2032 static int gigaset_chars_in_buffer(struct cardstate *cs)
2033 {
2034 return cs->cmdbytes;
2035 }
2036
2037 /* gigaset_brkchars
2038 * implementation of ioctl(GIGASET_BRKCHARS)
2039 * parameter:
2040 * controller state structure
2041 * return value:
2042 * -EINVAL (unimplemented function)
2043 */
2044 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
2045 {
2046 return -EINVAL;
2047 }
2048
2049
2050 /* Device Initialization/Shutdown */
2051 /* ============================== */
2052
2053 /* Free hardware dependent part of the B channel structure
2054 * parameter:
2055 * bcs B channel structure
2056 * return value:
2057 * !=0 on success
2058 */
2059 static int gigaset_freebcshw(struct bc_state *bcs)
2060 {
2061 struct bas_bc_state *ubc = bcs->hw.bas;
2062 int i;
2063
2064 if (!ubc)
2065 return 0;
2066
2067 /* kill URBs and tasklets before freeing - better safe than sorry */
2068 ubc->running = 0;
2069 gig_dbg(DEBUG_INIT, "%s: killing iso URBs", __func__);
2070 for (i = 0; i < BAS_OUTURBS; ++i) {
2071 usb_kill_urb(ubc->isoouturbs[i].urb);
2072 usb_free_urb(ubc->isoouturbs[i].urb);
2073 }
2074 for (i = 0; i < BAS_INURBS; ++i) {
2075 usb_kill_urb(ubc->isoinurbs[i]);
2076 usb_free_urb(ubc->isoinurbs[i]);
2077 }
2078 tasklet_kill(&ubc->sent_tasklet);
2079 tasklet_kill(&ubc->rcvd_tasklet);
2080 kfree(ubc->isooutbuf);
2081 kfree(ubc);
2082 bcs->hw.bas = NULL;
2083 return 1;
2084 }
2085
2086 /* Initialize hardware dependent part of the B channel structure
2087 * parameter:
2088 * bcs B channel structure
2089 * return value:
2090 * !=0 on success
2091 */
2092 static int gigaset_initbcshw(struct bc_state *bcs)
2093 {
2094 int i;
2095 struct bas_bc_state *ubc;
2096
2097 bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2098 if (!ubc) {
2099 pr_err("out of memory\n");
2100 return 0;
2101 }
2102
2103 ubc->running = 0;
2104 atomic_set(&ubc->corrbytes, 0);
2105 spin_lock_init(&ubc->isooutlock);
2106 for (i = 0; i < BAS_OUTURBS; ++i) {
2107 ubc->isoouturbs[i].urb = NULL;
2108 ubc->isoouturbs[i].bcs = bcs;
2109 }
2110 ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2111 ubc->numsub = 0;
2112 ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL);
2113 if (!ubc->isooutbuf) {
2114 pr_err("out of memory\n");
2115 kfree(ubc);
2116 bcs->hw.bas = NULL;
2117 return 0;
2118 }
2119 tasklet_init(&ubc->sent_tasklet,
2120 write_iso_tasklet, (unsigned long) bcs);
2121
2122 spin_lock_init(&ubc->isoinlock);
2123 for (i = 0; i < BAS_INURBS; ++i)
2124 ubc->isoinurbs[i] = NULL;
2125 ubc->isoindone = NULL;
2126 ubc->loststatus = -EINPROGRESS;
2127 ubc->isoinlost = 0;
2128 ubc->seqlen = 0;
2129 ubc->inbyte = 0;
2130 ubc->inbits = 0;
2131 ubc->goodbytes = 0;
2132 ubc->alignerrs = 0;
2133 ubc->fcserrs = 0;
2134 ubc->frameerrs = 0;
2135 ubc->giants = 0;
2136 ubc->runts = 0;
2137 ubc->aborts = 0;
2138 ubc->shared0s = 0;
2139 ubc->stolen0s = 0;
2140 tasklet_init(&ubc->rcvd_tasklet,
2141 read_iso_tasklet, (unsigned long) bcs);
2142 return 1;
2143 }
2144
2145 static void gigaset_reinitbcshw(struct bc_state *bcs)
2146 {
2147 struct bas_bc_state *ubc = bcs->hw.bas;
2148
2149 bcs->hw.bas->running = 0;
2150 atomic_set(&bcs->hw.bas->corrbytes, 0);
2151 bcs->hw.bas->numsub = 0;
2152 spin_lock_init(&ubc->isooutlock);
2153 spin_lock_init(&ubc->isoinlock);
2154 ubc->loststatus = -EINPROGRESS;
2155 }
2156
2157 static void gigaset_freecshw(struct cardstate *cs)
2158 {
2159 /* timers, URBs and rcvbuf are disposed of in disconnect */
2160 kfree(cs->hw.bas->int_in_buf);
2161 kfree(cs->hw.bas);
2162 cs->hw.bas = NULL;
2163 }
2164
2165 static int gigaset_initcshw(struct cardstate *cs)
2166 {
2167 struct bas_cardstate *ucs;
2168
2169 cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2170 if (!ucs) {
2171 pr_err("out of memory\n");
2172 return 0;
2173 }
2174 ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
2175 if (!ucs->int_in_buf) {
2176 kfree(ucs);
2177 pr_err("out of memory\n");
2178 return 0;
2179 }
2180
2181 ucs->urb_cmd_in = NULL;
2182 ucs->urb_cmd_out = NULL;
2183 ucs->rcvbuf = NULL;
2184 ucs->rcvbuf_size = 0;
2185
2186 spin_lock_init(&ucs->lock);
2187 ucs->pending = 0;
2188
2189 ucs->basstate = 0;
2190 init_timer(&ucs->timer_ctrl);
2191 init_timer(&ucs->timer_atrdy);
2192 init_timer(&ucs->timer_cmd_in);
2193 init_waitqueue_head(&ucs->waitqueue);
2194
2195 return 1;
2196 }
2197
2198 /* freeurbs
2199 * unlink and deallocate all URBs unconditionally
2200 * caller must make sure that no commands are still in progress
2201 * parameter:
2202 * cs controller state structure
2203 */
2204 static void freeurbs(struct cardstate *cs)
2205 {
2206 struct bas_cardstate *ucs = cs->hw.bas;
2207 struct bas_bc_state *ubc;
2208 int i, j;
2209
2210 gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2211 for (j = 0; j < BAS_CHANNELS; ++j) {
2212 ubc = cs->bcs[j].hw.bas;
2213 for (i = 0; i < BAS_OUTURBS; ++i) {
2214 usb_kill_urb(ubc->isoouturbs[i].urb);
2215 usb_free_urb(ubc->isoouturbs[i].urb);
2216 ubc->isoouturbs[i].urb = NULL;
2217 }
2218 for (i = 0; i < BAS_INURBS; ++i) {
2219 usb_kill_urb(ubc->isoinurbs[i]);
2220 usb_free_urb(ubc->isoinurbs[i]);
2221 ubc->isoinurbs[i] = NULL;
2222 }
2223 }
2224 usb_kill_urb(ucs->urb_int_in);
2225 usb_free_urb(ucs->urb_int_in);
2226 ucs->urb_int_in = NULL;
2227 usb_kill_urb(ucs->urb_cmd_out);
2228 usb_free_urb(ucs->urb_cmd_out);
2229 ucs->urb_cmd_out = NULL;
2230 usb_kill_urb(ucs->urb_cmd_in);
2231 usb_free_urb(ucs->urb_cmd_in);
2232 ucs->urb_cmd_in = NULL;
2233 usb_kill_urb(ucs->urb_ctrl);
2234 usb_free_urb(ucs->urb_ctrl);
2235 ucs->urb_ctrl = NULL;
2236 }
2237
2238 /* gigaset_probe
2239 * This function is called when a new USB device is connected.
2240 * It checks whether the new device is handled by this driver.
2241 */
2242 static int gigaset_probe(struct usb_interface *interface,
2243 const struct usb_device_id *id)
2244 {
2245 struct usb_host_interface *hostif;
2246 struct usb_device *udev = interface_to_usbdev(interface);
2247 struct cardstate *cs = NULL;
2248 struct bas_cardstate *ucs = NULL;
2249 struct bas_bc_state *ubc;
2250 struct usb_endpoint_descriptor *endpoint;
2251 int i, j;
2252 int rc;
2253
2254 gig_dbg(DEBUG_ANY,
2255 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2256 __func__, le16_to_cpu(udev->descriptor.idVendor),
2257 le16_to_cpu(udev->descriptor.idProduct));
2258
2259 /* set required alternate setting */
2260 hostif = interface->cur_altsetting;
2261 if (hostif->desc.bAlternateSetting != 3) {
2262 gig_dbg(DEBUG_ANY,
2263 "%s: wrong alternate setting %d - trying to switch",
2264 __func__, hostif->desc.bAlternateSetting);
2265 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3)
2266 < 0) {
2267 dev_warn(&udev->dev, "usb_set_interface failed, "
2268 "device %d interface %d altsetting %d\n",
2269 udev->devnum, hostif->desc.bInterfaceNumber,
2270 hostif->desc.bAlternateSetting);
2271 return -ENODEV;
2272 }
2273 hostif = interface->cur_altsetting;
2274 }
2275
2276 /* Reject application specific interfaces
2277 */
2278 if (hostif->desc.bInterfaceClass != 255) {
2279 dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2280 __func__, hostif->desc.bInterfaceClass);
2281 return -ENODEV;
2282 }
2283
2284 dev_info(&udev->dev,
2285 "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2286 __func__, le16_to_cpu(udev->descriptor.idVendor),
2287 le16_to_cpu(udev->descriptor.idProduct));
2288
2289 /* allocate memory for our device state and intialize it */
2290 cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
2291 GIGASET_MODULENAME);
2292 if (!cs)
2293 return -ENODEV;
2294 ucs = cs->hw.bas;
2295
2296 /* save off device structure ptrs for later use */
2297 usb_get_dev(udev);
2298 ucs->udev = udev;
2299 ucs->interface = interface;
2300 cs->dev = &interface->dev;
2301
2302 /* allocate URBs:
2303 * - one for the interrupt pipe
2304 * - three for the different uses of the default control pipe
2305 * - three for each isochronous pipe
2306 */
2307 if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2308 !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2309 !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
2310 !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2311 goto allocerr;
2312
2313 for (j = 0; j < BAS_CHANNELS; ++j) {
2314 ubc = cs->bcs[j].hw.bas;
2315 for (i = 0; i < BAS_OUTURBS; ++i)
2316 if (!(ubc->isoouturbs[i].urb =
2317 usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2318 goto allocerr;
2319 for (i = 0; i < BAS_INURBS; ++i)
2320 if (!(ubc->isoinurbs[i] =
2321 usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2322 goto allocerr;
2323 }
2324
2325 ucs->rcvbuf = NULL;
2326 ucs->rcvbuf_size = 0;
2327
2328 /* Fill the interrupt urb and send it to the core */
2329 endpoint = &hostif->endpoint[0].desc;
2330 usb_fill_int_urb(ucs->urb_int_in, udev,
2331 usb_rcvintpipe(udev,
2332 (endpoint->bEndpointAddress) & 0x0f),
2333 ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
2334 endpoint->bInterval);
2335 rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2336 if (rc != 0) {
2337 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2338 get_usb_rcmsg(rc));
2339 goto error;
2340 }
2341
2342 /* tell the device that the driver is ready */
2343 rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
2344 if (rc != 0)
2345 goto error;
2346
2347 /* tell common part that the device is ready */
2348 if (startmode == SM_LOCKED)
2349 cs->mstate = MS_LOCKED;
2350
2351 /* save address of controller structure */
2352 usb_set_intfdata(interface, cs);
2353
2354 if (!gigaset_start(cs))
2355 goto error;
2356
2357 return 0;
2358
2359 allocerr:
2360 dev_err(cs->dev, "could not allocate URBs\n");
2361 error:
2362 freeurbs(cs);
2363 usb_set_intfdata(interface, NULL);
2364 gigaset_freecs(cs);
2365 return -ENODEV;
2366 }
2367
2368 /* gigaset_disconnect
2369 * This function is called when the Gigaset base is unplugged.
2370 */
2371 static void gigaset_disconnect(struct usb_interface *interface)
2372 {
2373 struct cardstate *cs;
2374 struct bas_cardstate *ucs;
2375 int j;
2376
2377 cs = usb_get_intfdata(interface);
2378
2379 ucs = cs->hw.bas;
2380
2381 dev_info(cs->dev, "disconnecting Gigaset base\n");
2382
2383 /* mark base as not ready, all channels disconnected */
2384 ucs->basstate = 0;
2385
2386 /* tell LL all channels are down */
2387 for (j = 0; j < BAS_CHANNELS; ++j)
2388 gigaset_bchannel_down(cs->bcs + j);
2389
2390 /* stop driver (common part) */
2391 gigaset_stop(cs);
2392
2393 /* stop timers and URBs, free ressources */
2394 del_timer_sync(&ucs->timer_ctrl);
2395 del_timer_sync(&ucs->timer_atrdy);
2396 del_timer_sync(&ucs->timer_cmd_in);
2397 freeurbs(cs);
2398 usb_set_intfdata(interface, NULL);
2399 kfree(ucs->rcvbuf);
2400 ucs->rcvbuf = NULL;
2401 ucs->rcvbuf_size = 0;
2402 usb_put_dev(ucs->udev);
2403 ucs->interface = NULL;
2404 ucs->udev = NULL;
2405 cs->dev = NULL;
2406 gigaset_freecs(cs);
2407 }
2408
2409 /* gigaset_suspend
2410 * This function is called before the USB connection is suspended.
2411 */
2412 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2413 {
2414 struct cardstate *cs = usb_get_intfdata(intf);
2415 struct bas_cardstate *ucs = cs->hw.bas;
2416 int rc;
2417
2418 /* set suspend flag; this stops AT command/response traffic */
2419 if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2420 gig_dbg(DEBUG_SUSPEND, "already suspended");
2421 return 0;
2422 }
2423
2424 /* wait a bit for blocking conditions to go away */
2425 rc = wait_event_timeout(ucs->waitqueue,
2426 !(ucs->basstate &
2427 (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)),
2428 BAS_TIMEOUT*HZ/10);
2429 gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2430
2431 /* check for conditions preventing suspend */
2432 if (ucs->basstate & (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)) {
2433 dev_warn(cs->dev, "cannot suspend:\n");
2434 if (ucs->basstate & BS_B1OPEN)
2435 dev_warn(cs->dev, " B channel 1 open\n");
2436 if (ucs->basstate & BS_B2OPEN)
2437 dev_warn(cs->dev, " B channel 2 open\n");
2438 if (ucs->basstate & BS_ATRDPEND)
2439 dev_warn(cs->dev, " receiving AT reply\n");
2440 if (ucs->basstate & BS_ATWRPEND)
2441 dev_warn(cs->dev, " sending AT command\n");
2442 update_basstate(ucs, 0, BS_SUSPEND);
2443 return -EBUSY;
2444 }
2445
2446 /* close AT channel if open */
2447 if (ucs->basstate & BS_ATOPEN) {
2448 gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2449 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2450 if (rc) {
2451 update_basstate(ucs, 0, BS_SUSPEND);
2452 return rc;
2453 }
2454 wait_event_timeout(ucs->waitqueue, !ucs->pending,
2455 BAS_TIMEOUT*HZ/10);
2456 /* in case of timeout, proceed anyway */
2457 }
2458
2459 /* kill all URBs and timers that might still be pending */
2460 usb_kill_urb(ucs->urb_ctrl);
2461 usb_kill_urb(ucs->urb_int_in);
2462 del_timer_sync(&ucs->timer_ctrl);
2463
2464 gig_dbg(DEBUG_SUSPEND, "suspend complete");
2465 return 0;
2466 }
2467
2468 /* gigaset_resume
2469 * This function is called after the USB connection has been resumed.
2470 */
2471 static int gigaset_resume(struct usb_interface *intf)
2472 {
2473 struct cardstate *cs = usb_get_intfdata(intf);
2474 struct bas_cardstate *ucs = cs->hw.bas;
2475 int rc;
2476
2477 /* resubmit interrupt URB for spontaneous messages from base */
2478 rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2479 if (rc) {
2480 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2481 get_usb_rcmsg(rc));
2482 return rc;
2483 }
2484
2485 /* clear suspend flag to reallow activity */
2486 update_basstate(ucs, 0, BS_SUSPEND);
2487
2488 gig_dbg(DEBUG_SUSPEND, "resume complete");
2489 return 0;
2490 }
2491
2492 /* gigaset_pre_reset
2493 * This function is called before the USB connection is reset.
2494 */
2495 static int gigaset_pre_reset(struct usb_interface *intf)
2496 {
2497 /* handle just like suspend */
2498 return gigaset_suspend(intf, PMSG_ON);
2499 }
2500
2501 /* gigaset_post_reset
2502 * This function is called after the USB connection has been reset.
2503 */
2504 static int gigaset_post_reset(struct usb_interface *intf)
2505 {
2506 /* FIXME: send HD_DEVICE_INIT_ACK? */
2507
2508 /* resume operations */
2509 return gigaset_resume(intf);
2510 }
2511
2512
2513 static const struct gigaset_ops gigops = {
2514 gigaset_write_cmd,
2515 gigaset_write_room,
2516 gigaset_chars_in_buffer,
2517 gigaset_brkchars,
2518 gigaset_init_bchannel,
2519 gigaset_close_bchannel,
2520 gigaset_initbcshw,
2521 gigaset_freebcshw,
2522 gigaset_reinitbcshw,
2523 gigaset_initcshw,
2524 gigaset_freecshw,
2525 gigaset_set_modem_ctrl,
2526 gigaset_baud_rate,
2527 gigaset_set_line_ctrl,
2528 gigaset_isoc_send_skb,
2529 gigaset_isoc_input,
2530 };
2531
2532 /* bas_gigaset_init
2533 * This function is called after the kernel module is loaded.
2534 */
2535 static int __init bas_gigaset_init(void)
2536 {
2537 int result;
2538
2539 /* allocate memory for our driver state and intialize it */
2540 driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2541 GIGASET_MODULENAME, GIGASET_DEVNAME,
2542 &gigops, THIS_MODULE);
2543 if (driver == NULL)
2544 goto error;
2545
2546 /* register this driver with the USB subsystem */
2547 result = usb_register(&gigaset_usb_driver);
2548 if (result < 0) {
2549 pr_err("error %d registering USB driver\n", -result);
2550 goto error;
2551 }
2552
2553 pr_info(DRIVER_DESC "\n");
2554 return 0;
2555
2556 error:
2557 if (driver)
2558 gigaset_freedriver(driver);
2559 driver = NULL;
2560 return -1;
2561 }
2562
2563 /* bas_gigaset_exit
2564 * This function is called before the kernel module is unloaded.
2565 */
2566 static void __exit bas_gigaset_exit(void)
2567 {
2568 struct bas_cardstate *ucs;
2569 int i;
2570
2571 gigaset_blockdriver(driver); /* => probe will fail
2572 * => no gigaset_start any more
2573 */
2574
2575 /* stop all connected devices */
2576 for (i = 0; i < driver->minors; i++) {
2577 if (gigaset_shutdown(driver->cs + i) < 0)
2578 continue; /* no device */
2579 /* from now on, no isdn callback should be possible */
2580
2581 /* close all still open channels */
2582 ucs = driver->cs[i].hw.bas;
2583 if (ucs->basstate & BS_B1OPEN) {
2584 gig_dbg(DEBUG_INIT, "closing B1 channel");
2585 usb_control_msg(ucs->udev,
2586 usb_sndctrlpipe(ucs->udev, 0),
2587 HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2588 0, 0, NULL, 0, BAS_TIMEOUT);
2589 }
2590 if (ucs->basstate & BS_B2OPEN) {
2591 gig_dbg(DEBUG_INIT, "closing B2 channel");
2592 usb_control_msg(ucs->udev,
2593 usb_sndctrlpipe(ucs->udev, 0),
2594 HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2595 0, 0, NULL, 0, BAS_TIMEOUT);
2596 }
2597 if (ucs->basstate & BS_ATOPEN) {
2598 gig_dbg(DEBUG_INIT, "closing AT channel");
2599 usb_control_msg(ucs->udev,
2600 usb_sndctrlpipe(ucs->udev, 0),
2601 HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2602 0, 0, NULL, 0, BAS_TIMEOUT);
2603 }
2604 ucs->basstate = 0;
2605 }
2606
2607 /* deregister this driver with the USB subsystem */
2608 usb_deregister(&gigaset_usb_driver);
2609 /* this will call the disconnect-callback */
2610 /* from now on, no disconnect/probe callback should be running */
2611
2612 gigaset_freedriver(driver);
2613 driver = NULL;
2614 }
2615
2616
2617 module_init(bas_gigaset_init);
2618 module_exit(bas_gigaset_exit);
2619
2620 MODULE_AUTHOR(DRIVER_AUTHOR);
2621 MODULE_DESCRIPTION(DRIVER_DESC);
2622 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree