]> nv-tegra.nvidia Code Review - linux-2.6.git/blob - drivers/isdn/gigaset/bas-gigaset.c
gigaset: handle isoc frame errors more gracefully
[linux-2.6.git] / drivers / isdn / gigaset / bas-gigaset.c
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
138
139 static struct gigaset_driver *driver = NULL;
140
141 /* usb specific object needed to register this driver with the usb subsystem */
142 static struct usb_driver gigaset_usb_driver = {
143         .name =         GIGASET_MODULENAME,
144         .probe =        gigaset_probe,
145         .disconnect =   gigaset_disconnect,
146         .id_table =     gigaset_table,
147         .suspend =      gigaset_suspend,
148         .resume =       gigaset_resume,
149         .reset_resume = gigaset_post_reset,
150         .pre_reset =    gigaset_pre_reset,
151         .post_reset =   gigaset_post_reset,
152 };
153
154 /* get message text for usb_submit_urb return code
155  */
156 static char *get_usb_rcmsg(int rc)
157 {
158         static char unkmsg[28];
159
160         switch (rc) {
161         case 0:
162                 return "success";
163         case -ENOMEM:
164                 return "out of memory";
165         case -ENODEV:
166                 return "device not present";
167         case -ENOENT:
168                 return "endpoint not present";
169         case -ENXIO:
170                 return "URB type not supported";
171         case -EINVAL:
172                 return "invalid argument";
173         case -EAGAIN:
174                 return "start frame too early or too much scheduled";
175         case -EFBIG:
176                 return "too many isochronous frames requested";
177         case -EPIPE:
178                 return "endpoint stalled";
179         case -EMSGSIZE:
180                 return "invalid packet size";
181         case -ENOSPC:
182                 return "would overcommit USB bandwidth";
183         case -ESHUTDOWN:
184                 return "device shut down";
185         case -EPERM:
186                 return "reject flag set";
187         case -EHOSTUNREACH:
188                 return "device suspended";
189         default:
190                 snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
191                 return unkmsg;
192         }
193 }
194
195 /* get message text for USB status code
196  */
197 static char *get_usb_statmsg(int status)
198 {
199         static char unkmsg[28];
200
201         switch (status) {
202         case 0:
203                 return "success";
204         case -ENOENT:
205                 return "unlinked (sync)";
206         case -EINPROGRESS:
207                 return "pending";
208         case -EPROTO:
209                 return "bit stuffing error, timeout, or unknown USB error";
210         case -EILSEQ:
211                 return "CRC mismatch, timeout, or unknown USB error";
212         case -ETIME:
213                 return "timed out";
214         case -EPIPE:
215                 return "endpoint stalled";
216         case -ECOMM:
217                 return "IN buffer overrun";
218         case -ENOSR:
219                 return "OUT buffer underrun";
220         case -EOVERFLOW:
221                 return "too much data";
222         case -EREMOTEIO:
223                 return "short packet detected";
224         case -ENODEV:
225                 return "device removed";
226         case -EXDEV:
227                 return "partial isochronous transfer";
228         case -EINVAL:
229                 return "invalid argument";
230         case -ECONNRESET:
231                 return "unlinked (async)";
232         case -ESHUTDOWN:
233                 return "device shut down";
234         default:
235                 snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
236                 return unkmsg;
237         }
238 }
239
240 /* usb_pipetype_str
241  * retrieve string representation of USB pipe type
242  */
243 static inline char *usb_pipetype_str(int pipe)
244 {
245         if (usb_pipeisoc(pipe))
246                 return "Isoc";
247         if (usb_pipeint(pipe))
248                 return "Int";
249         if (usb_pipecontrol(pipe))
250                 return "Ctrl";
251         if (usb_pipebulk(pipe))
252                 return "Bulk";
253         return "?";
254 }
255
256 /* dump_urb
257  * write content of URB to syslog for debugging
258  */
259 static inline void dump_urb(enum debuglevel level, const char *tag,
260                             struct urb *urb)
261 {
262 #ifdef CONFIG_GIGASET_DEBUG
263         int i;
264         gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
265         if (urb) {
266                 gig_dbg(level,
267                         "  dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
268                         "hcpriv=0x%08lx, transfer_flags=0x%x,",
269                         (unsigned long) urb->dev,
270                         usb_pipetype_str(urb->pipe),
271                         usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
272                         usb_pipein(urb->pipe) ? "in" : "out",
273                         (unsigned long) urb->hcpriv,
274                         urb->transfer_flags);
275                 gig_dbg(level,
276                         "  transfer_buffer=0x%08lx[%d], actual_length=%d, "
277                         "setup_packet=0x%08lx,",
278                         (unsigned long) urb->transfer_buffer,
279                         urb->transfer_buffer_length, urb->actual_length,
280                         (unsigned long) urb->setup_packet);
281                 gig_dbg(level,
282                         "  start_frame=%d, number_of_packets=%d, interval=%d, "
283                         "error_count=%d,",
284                         urb->start_frame, urb->number_of_packets, urb->interval,
285                         urb->error_count);
286                 gig_dbg(level,
287                         "  context=0x%08lx, complete=0x%08lx, "
288                         "iso_frame_desc[]={",
289                         (unsigned long) urb->context,
290                         (unsigned long) urb->complete);
291                 for (i = 0; i < urb->number_of_packets; i++) {
292                         struct usb_iso_packet_descriptor *pifd
293                                 = &urb->iso_frame_desc[i];
294                         gig_dbg(level,
295                                 "    {offset=%u, length=%u, actual_length=%u, "
296                                 "status=%u}",
297                                 pifd->offset, pifd->length, pifd->actual_length,
298                                 pifd->status);
299                 }
300         }
301         gig_dbg(level, "}}");
302 #endif
303 }
304
305 /* read/set modem control bits etc. (m10x only) */
306 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
307                                   unsigned new_state)
308 {
309         return -EINVAL;
310 }
311
312 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
313 {
314         return -EINVAL;
315 }
316
317 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
318 {
319         return -EINVAL;
320 }
321
322 /* error_hangup
323  * hang up any existing connection because of an unrecoverable error
324  * This function may be called from any context and takes care of scheduling
325  * the necessary actions for execution outside of interrupt context.
326  * cs->lock must not be held.
327  * argument:
328  *      B channel control structure
329  */
330 static inline void error_hangup(struct bc_state *bcs)
331 {
332         struct cardstate *cs = bcs->cs;
333
334         gig_dbg(DEBUG_ANY, "%s: scheduling HUP for channel %d",
335                 __func__, bcs->channel);
336
337         if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL))
338                 dev_err(cs->dev, "event queue full\n");
339
340         gigaset_schedule_event(cs);
341 }
342
343 /* error_reset
344  * reset Gigaset device because of an unrecoverable error
345  * This function may be called from any context, and takes care of
346  * scheduling the necessary actions for execution outside of interrupt context.
347  * cs->lock must not be held.
348  * argument:
349  *      controller state structure
350  */
351 static inline void error_reset(struct cardstate *cs)
352 {
353         /* close AT command channel to recover (ignore errors) */
354         req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
355
356         //FIXME try to recover without bothering the user
357         dev_err(cs->dev,
358             "unrecoverable error - please disconnect Gigaset base to reset\n");
359 }
360
361 /* check_pending
362  * check for completion of pending control request
363  * parameter:
364  *      ucs     hardware specific controller state structure
365  */
366 static void check_pending(struct bas_cardstate *ucs)
367 {
368         unsigned long flags;
369
370         spin_lock_irqsave(&ucs->lock, flags);
371         switch (ucs->pending) {
372         case 0:
373                 break;
374         case HD_OPEN_ATCHANNEL:
375                 if (ucs->basstate & BS_ATOPEN)
376                         ucs->pending = 0;
377                 break;
378         case HD_OPEN_B1CHANNEL:
379                 if (ucs->basstate & BS_B1OPEN)
380                         ucs->pending = 0;
381                 break;
382         case HD_OPEN_B2CHANNEL:
383                 if (ucs->basstate & BS_B2OPEN)
384                         ucs->pending = 0;
385                 break;
386         case HD_CLOSE_ATCHANNEL:
387                 if (!(ucs->basstate & BS_ATOPEN))
388                         ucs->pending = 0;
389                 break;
390         case HD_CLOSE_B1CHANNEL:
391                 if (!(ucs->basstate & BS_B1OPEN))
392                         ucs->pending = 0;
393                 break;
394         case HD_CLOSE_B2CHANNEL:
395                 if (!(ucs->basstate & BS_B2OPEN))
396                         ucs->pending = 0;
397                 break;
398         case HD_DEVICE_INIT_ACK:                /* no reply expected */
399                 ucs->pending = 0;
400                 break;
401         /* HD_READ_ATMESSAGE, HD_WRITE_ATMESSAGE, HD_RESET_INTERRUPTPIPE
402          * are handled separately and should never end up here
403          */
404         default:
405                 dev_warn(&ucs->interface->dev,
406                          "unknown pending request 0x%02x cleared\n",
407                          ucs->pending);
408                 ucs->pending = 0;
409         }
410
411         if (!ucs->pending)
412                 del_timer(&ucs->timer_ctrl);
413
414         spin_unlock_irqrestore(&ucs->lock, flags);
415 }
416
417 /* cmd_in_timeout
418  * timeout routine for command input request
419  * argument:
420  *      controller state structure
421  */
422 static void cmd_in_timeout(unsigned long data)
423 {
424         struct cardstate *cs = (struct cardstate *) data;
425         struct bas_cardstate *ucs = cs->hw.bas;
426         int rc;
427
428         if (!ucs->rcvbuf_size) {
429                 gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
430                 return;
431         }
432
433         if (ucs->retry_cmd_in++ < BAS_RETRY) {
434                 dev_notice(cs->dev, "control read: timeout, retry %d\n",
435                            ucs->retry_cmd_in);
436                 rc = atread_submit(cs, BAS_TIMEOUT);
437                 if (rc >= 0 || rc == -ENODEV)
438                         /* resubmitted or disconnected */
439                         /* - bypass regular exit block */
440                         return;
441         } else {
442                 dev_err(cs->dev,
443                         "control read: timeout, giving up after %d tries\n",
444                         ucs->retry_cmd_in);
445         }
446         kfree(ucs->rcvbuf);
447         ucs->rcvbuf = NULL;
448         ucs->rcvbuf_size = 0;
449         error_reset(cs);
450 }
451
452 /* set/clear bits in base connection state, return previous state
453  */
454 inline static int update_basstate(struct bas_cardstate *ucs,
455                                   int set, int clear)
456 {
457         unsigned long flags;
458         int state;
459
460         spin_lock_irqsave(&ucs->lock, flags);
461         state = ucs->basstate;
462         ucs->basstate = (state & ~clear) | set;
463         spin_unlock_irqrestore(&ucs->lock, flags);
464         return state;
465 }
466
467 /* read_ctrl_callback
468  * USB completion handler for control pipe input
469  * called by the USB subsystem in interrupt context
470  * parameter:
471  *      urb     USB request block
472  *              urb->context = inbuf structure for controller state
473  */
474 static void read_ctrl_callback(struct urb *urb)
475 {
476         struct inbuf_t *inbuf = urb->context;
477         struct cardstate *cs = inbuf->cs;
478         struct bas_cardstate *ucs = cs->hw.bas;
479         int status = urb->status;
480         int have_data = 0;
481         unsigned numbytes;
482         int rc;
483
484         update_basstate(ucs, 0, BS_ATRDPEND);
485         wake_up(&ucs->waitqueue);
486
487         if (!ucs->rcvbuf_size) {
488                 dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
489                 return;
490         }
491
492         del_timer(&ucs->timer_cmd_in);
493
494         switch (status) {
495         case 0:                         /* normal completion */
496                 numbytes = urb->actual_length;
497                 if (unlikely(numbytes != ucs->rcvbuf_size)) {
498                         dev_warn(cs->dev,
499                                "control read: received %d chars, expected %d\n",
500                                  numbytes, ucs->rcvbuf_size);
501                         if (numbytes > ucs->rcvbuf_size)
502                                 numbytes = ucs->rcvbuf_size;
503                 }
504
505                 /* copy received bytes to inbuf */
506                 have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
507
508                 if (unlikely(numbytes < ucs->rcvbuf_size)) {
509                         /* incomplete - resubmit for remaining bytes */
510                         ucs->rcvbuf_size -= numbytes;
511                         ucs->retry_cmd_in = 0;
512                         rc = atread_submit(cs, BAS_TIMEOUT);
513                         if (rc >= 0 || rc == -ENODEV)
514                                 /* resubmitted or disconnected */
515                                 /* - bypass regular exit block */
516                                 return;
517                         error_reset(cs);
518                 }
519                 break;
520
521         case -ENOENT:                   /* cancelled */
522         case -ECONNRESET:               /* cancelled (async) */
523         case -EINPROGRESS:              /* pending */
524         case -ENODEV:                   /* device removed */
525         case -ESHUTDOWN:                /* device shut down */
526                 /* no action necessary */
527                 gig_dbg(DEBUG_USBREQ, "%s: %s",
528                         __func__, get_usb_statmsg(status));
529                 break;
530
531         default:                        /* severe trouble */
532                 dev_warn(cs->dev, "control read: %s\n",
533                          get_usb_statmsg(status));
534                 if (ucs->retry_cmd_in++ < BAS_RETRY) {
535                         dev_notice(cs->dev, "control read: retry %d\n",
536                                    ucs->retry_cmd_in);
537                         rc = atread_submit(cs, BAS_TIMEOUT);
538                         if (rc >= 0 || rc == -ENODEV)
539                                 /* resubmitted or disconnected */
540                                 /* - bypass regular exit block */
541                                 return;
542                 } else {
543                         dev_err(cs->dev,
544                                 "control read: giving up after %d tries\n",
545                                 ucs->retry_cmd_in);
546                 }
547                 error_reset(cs);
548         }
549
550         kfree(ucs->rcvbuf);
551         ucs->rcvbuf = NULL;
552         ucs->rcvbuf_size = 0;
553         if (have_data) {
554                 gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
555                 gigaset_schedule_event(cs);
556         }
557 }
558
559 /* atread_submit
560  * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
561  * parameters:
562  *      cs      controller state structure
563  *      timeout timeout in 1/10 sec., 0: none
564  * return value:
565  *      0 on success
566  *      -EBUSY if another request is pending
567  *      any URB submission error code
568  */
569 static int atread_submit(struct cardstate *cs, int timeout)
570 {
571         struct bas_cardstate *ucs = cs->hw.bas;
572         int basstate;
573         int ret;
574
575         gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
576                 ucs->rcvbuf_size);
577
578         basstate = update_basstate(ucs, BS_ATRDPEND, 0);
579         if (basstate & BS_ATRDPEND) {
580                 dev_err(cs->dev,
581                         "could not submit HD_READ_ATMESSAGE: URB busy\n");
582                 return -EBUSY;
583         }
584
585         if (basstate & BS_SUSPEND) {
586                 dev_notice(cs->dev,
587                            "HD_READ_ATMESSAGE not submitted, "
588                            "suspend in progress\n");
589                 update_basstate(ucs, 0, BS_ATRDPEND);
590                 /* treat like disconnect */
591                 return -ENODEV;
592         }
593
594         ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
595         ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
596         ucs->dr_cmd_in.wValue = 0;
597         ucs->dr_cmd_in.wIndex = 0;
598         ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
599         usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
600                              usb_rcvctrlpipe(ucs->udev, 0),
601                              (unsigned char*) & ucs->dr_cmd_in,
602                              ucs->rcvbuf, ucs->rcvbuf_size,
603                              read_ctrl_callback, cs->inbuf);
604
605         if ((ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC)) != 0) {
606                 update_basstate(ucs, 0, BS_ATRDPEND);
607                 dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
608                         get_usb_rcmsg(ret));
609                 return ret;
610         }
611
612         if (timeout > 0) {
613                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
614                 ucs->timer_cmd_in.expires = jiffies + timeout * HZ / 10;
615                 ucs->timer_cmd_in.data = (unsigned long) cs;
616                 ucs->timer_cmd_in.function = cmd_in_timeout;
617                 add_timer(&ucs->timer_cmd_in);
618         }
619         return 0;
620 }
621
622 /* read_int_callback
623  * USB completion handler for interrupt pipe input
624  * called by the USB subsystem in interrupt context
625  * parameter:
626  *      urb     USB request block
627  *              urb->context = controller state structure
628  */
629 static void read_int_callback(struct urb *urb)
630 {
631         struct cardstate *cs = urb->context;
632         struct bas_cardstate *ucs = cs->hw.bas;
633         struct bc_state *bcs;
634         int status = urb->status;
635         unsigned long flags;
636         int rc;
637         unsigned l;
638         int channel;
639
640         switch (status) {
641         case 0:                 /* success */
642                 break;
643         case -ENOENT:                   /* cancelled */
644         case -ECONNRESET:               /* cancelled (async) */
645         case -EINPROGRESS:              /* pending */
646                 /* ignore silently */
647                 gig_dbg(DEBUG_USBREQ, "%s: %s",
648                         __func__, get_usb_statmsg(status));
649                 return;
650         case -ENODEV:                   /* device removed */
651         case -ESHUTDOWN:                /* device shut down */
652                 //FIXME use this as disconnect indicator?
653                 gig_dbg(DEBUG_USBREQ, "%s: device disconnected", __func__);
654                 return;
655         default:                /* severe trouble */
656                 dev_warn(cs->dev, "interrupt read: %s\n",
657                          get_usb_statmsg(status));
658                 //FIXME corrective action? resubmission always ok?
659                 goto resubmit;
660         }
661
662         /* drop incomplete packets even if the missing bytes wouldn't matter */
663         if (unlikely(urb->actual_length < IP_MSGSIZE)) {
664                 dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
665                          urb->actual_length);
666                 goto resubmit;
667         }
668
669         l = (unsigned) ucs->int_in_buf[1] +
670             (((unsigned) ucs->int_in_buf[2]) << 8);
671
672         gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
673                 urb->actual_length, (int)ucs->int_in_buf[0], l,
674                 (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
675
676         channel = 0;
677
678         switch (ucs->int_in_buf[0]) {
679         case HD_DEVICE_INIT_OK:
680                 update_basstate(ucs, BS_INIT, 0);
681                 break;
682
683         case HD_READY_SEND_ATDATA:
684                 del_timer(&ucs->timer_atrdy);
685                 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
686                 start_cbsend(cs);
687                 break;
688
689         case HD_OPEN_B2CHANNEL_ACK:
690                 ++channel;
691         case HD_OPEN_B1CHANNEL_ACK:
692                 bcs = cs->bcs + channel;
693                 update_basstate(ucs, BS_B1OPEN << channel, 0);
694                 gigaset_bchannel_up(bcs);
695                 break;
696
697         case HD_OPEN_ATCHANNEL_ACK:
698                 update_basstate(ucs, BS_ATOPEN, 0);
699                 start_cbsend(cs);
700                 break;
701
702         case HD_CLOSE_B2CHANNEL_ACK:
703                 ++channel;
704         case HD_CLOSE_B1CHANNEL_ACK:
705                 bcs = cs->bcs + channel;
706                 update_basstate(ucs, 0, BS_B1OPEN << channel);
707                 stopurbs(bcs->hw.bas);
708                 gigaset_bchannel_down(bcs);
709                 break;
710
711         case HD_CLOSE_ATCHANNEL_ACK:
712                 update_basstate(ucs, 0, BS_ATOPEN);
713                 break;
714
715         case HD_B2_FLOW_CONTROL:
716                 ++channel;
717         case HD_B1_FLOW_CONTROL:
718                 bcs = cs->bcs + channel;
719                 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
720                            &bcs->hw.bas->corrbytes);
721                 gig_dbg(DEBUG_ISO,
722                         "Flow control (channel %d, sub %d): 0x%02x => %d",
723                         channel, bcs->hw.bas->numsub, l,
724                         atomic_read(&bcs->hw.bas->corrbytes));
725                 break;
726
727         case HD_RECEIVEATDATA_ACK:      /* AT response ready to be received */
728                 if (!l) {
729                         dev_warn(cs->dev,
730                                 "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
731                         break;
732                 }
733                 spin_lock_irqsave(&cs->lock, flags);
734                 if (ucs->rcvbuf_size) {
735                         /* throw away previous buffer - we have no queue */
736                         dev_err(cs->dev,
737                                 "receive AT data overrun, %d bytes lost\n",
738                                 ucs->rcvbuf_size);
739                         kfree(ucs->rcvbuf);
740                         ucs->rcvbuf_size = 0;
741                 }
742                 if ((ucs->rcvbuf = kmalloc(l, GFP_ATOMIC)) == NULL) {
743                         spin_unlock_irqrestore(&cs->lock, flags);
744                         dev_err(cs->dev, "out of memory receiving AT data\n");
745                         error_reset(cs);
746                         break;
747                 }
748                 ucs->rcvbuf_size = l;
749                 ucs->retry_cmd_in = 0;
750                 if ((rc = atread_submit(cs, BAS_TIMEOUT)) < 0) {
751                         kfree(ucs->rcvbuf);
752                         ucs->rcvbuf = NULL;
753                         ucs->rcvbuf_size = 0;
754                         if (rc != -ENODEV) {
755                                 //FIXME corrective action?
756                                 spin_unlock_irqrestore(&cs->lock, flags);
757                                 error_reset(cs);
758                                 break;
759                         }
760                 }
761                 spin_unlock_irqrestore(&cs->lock, flags);
762                 break;
763
764         case HD_RESET_INTERRUPT_PIPE_ACK:
765                 gig_dbg(DEBUG_USBREQ, "HD_RESET_INTERRUPT_PIPE_ACK");
766                 break;
767
768         case HD_SUSPEND_END:
769                 gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
770                 break;
771
772         default:
773                 dev_warn(cs->dev,
774                          "unknown Gigaset signal 0x%02x (%u) ignored\n",
775                          (int) ucs->int_in_buf[0], l);
776         }
777
778         check_pending(ucs);
779         wake_up(&ucs->waitqueue);
780
781 resubmit:
782         rc = usb_submit_urb(urb, GFP_ATOMIC);
783         if (unlikely(rc != 0 && rc != -ENODEV)) {
784                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
785                         get_usb_rcmsg(rc));
786                 error_reset(cs);
787         }
788 }
789
790 /* read_iso_callback
791  * USB completion handler for B channel isochronous input
792  * called by the USB subsystem in interrupt context
793  * parameter:
794  *      urb     USB request block of completed request
795  *              urb->context = bc_state structure
796  */
797 static void read_iso_callback(struct urb *urb)
798 {
799         struct bc_state *bcs;
800         struct bas_bc_state *ubc;
801         int status = urb->status;
802         unsigned long flags;
803         int i, rc;
804
805         /* status codes not worth bothering the tasklet with */
806         if (unlikely(status == -ENOENT ||
807                      status == -ECONNRESET ||
808                      status == -EINPROGRESS ||
809                      status == -ENODEV ||
810                      status == -ESHUTDOWN)) {
811                 gig_dbg(DEBUG_ISO, "%s: %s",
812                         __func__, get_usb_statmsg(status));
813                 return;
814         }
815
816         bcs = urb->context;
817         ubc = bcs->hw.bas;
818
819         spin_lock_irqsave(&ubc->isoinlock, flags);
820         if (likely(ubc->isoindone == NULL)) {
821                 /* pass URB to tasklet */
822                 ubc->isoindone = urb;
823                 ubc->isoinstatus = status;
824                 tasklet_hi_schedule(&ubc->rcvd_tasklet);
825         } else {
826                 /* tasklet still busy, drop data and resubmit URB */
827                 ubc->loststatus = status;
828                 for (i = 0; i < BAS_NUMFRAMES; i++) {
829                         ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
830                         if (unlikely(urb->iso_frame_desc[i].status != 0 &&
831                                      urb->iso_frame_desc[i].status !=
832                                                                 -EINPROGRESS))
833                                 ubc->loststatus = urb->iso_frame_desc[i].status;
834                         urb->iso_frame_desc[i].status = 0;
835                         urb->iso_frame_desc[i].actual_length = 0;
836                 }
837                 if (likely(ubc->running)) {
838                         /* urb->dev is clobbered by USB subsystem */
839                         urb->dev = bcs->cs->hw.bas->udev;
840                         urb->transfer_flags = URB_ISO_ASAP;
841                         urb->number_of_packets = BAS_NUMFRAMES;
842                         gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
843                                 __func__);
844                         rc = usb_submit_urb(urb, GFP_ATOMIC);
845                         if (unlikely(rc != 0 && rc != -ENODEV)) {
846                                 dev_err(bcs->cs->dev,
847                                         "could not resubmit isochronous read "
848                                         "URB: %s\n", get_usb_rcmsg(rc));
849                                 dump_urb(DEBUG_ISO, "isoc read", urb);
850                                 error_hangup(bcs);
851                         }
852                 }
853         }
854         spin_unlock_irqrestore(&ubc->isoinlock, flags);
855 }
856
857 /* write_iso_callback
858  * USB completion handler for B channel isochronous output
859  * called by the USB subsystem in interrupt context
860  * parameter:
861  *      urb     USB request block of completed request
862  *              urb->context = isow_urbctx_t structure
863  */
864 static void write_iso_callback(struct urb *urb)
865 {
866         struct isow_urbctx_t *ucx;
867         struct bas_bc_state *ubc;
868         int status = urb->status;
869         unsigned long flags;
870
871         /* status codes not worth bothering the tasklet with */
872         if (unlikely(status == -ENOENT ||
873                      status == -ECONNRESET ||
874                      status == -EINPROGRESS ||
875                      status == -ENODEV ||
876                      status == -ESHUTDOWN)) {
877                 gig_dbg(DEBUG_ISO, "%s: %s",
878                         __func__, get_usb_statmsg(status));
879                 return;
880         }
881
882         /* pass URB context to tasklet */
883         ucx = urb->context;
884         ubc = ucx->bcs->hw.bas;
885         ucx->status = status;
886
887         spin_lock_irqsave(&ubc->isooutlock, flags);
888         ubc->isooutovfl = ubc->isooutdone;
889         ubc->isooutdone = ucx;
890         spin_unlock_irqrestore(&ubc->isooutlock, flags);
891         tasklet_hi_schedule(&ubc->sent_tasklet);
892 }
893
894 /* starturbs
895  * prepare and submit USB request blocks for isochronous input and output
896  * argument:
897  *      B channel control structure
898  * return value:
899  *      0 on success
900  *      < 0 on error (no URBs submitted)
901  */
902 static int starturbs(struct bc_state *bcs)
903 {
904         struct bas_bc_state *ubc = bcs->hw.bas;
905         struct urb *urb;
906         int j, k;
907         int rc;
908
909         /* initialize L2 reception */
910         if (bcs->proto2 == ISDN_PROTO_L2_HDLC)
911                 bcs->inputstate |= INS_flag_hunt;
912
913         /* submit all isochronous input URBs */
914         ubc->running = 1;
915         for (k = 0; k < BAS_INURBS; k++) {
916                 urb = ubc->isoinurbs[k];
917                 if (!urb) {
918                         rc = -EFAULT;
919                         goto error;
920                 }
921
922                 urb->dev = bcs->cs->hw.bas->udev;
923                 urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
924                 urb->transfer_flags = URB_ISO_ASAP;
925                 urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
926                 urb->transfer_buffer_length = BAS_INBUFSIZE;
927                 urb->number_of_packets = BAS_NUMFRAMES;
928                 urb->interval = BAS_FRAMETIME;
929                 urb->complete = read_iso_callback;
930                 urb->context = bcs;
931                 for (j = 0; j < BAS_NUMFRAMES; j++) {
932                         urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
933                         urb->iso_frame_desc[j].length = BAS_MAXFRAME;
934                         urb->iso_frame_desc[j].status = 0;
935                         urb->iso_frame_desc[j].actual_length = 0;
936                 }
937
938                 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
939                 if ((rc = usb_submit_urb(urb, GFP_ATOMIC)) != 0)
940                         goto error;
941         }
942
943         /* initialize L2 transmission */
944         gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
945
946         /* set up isochronous output URBs for flag idling */
947         for (k = 0; k < BAS_OUTURBS; ++k) {
948                 urb = ubc->isoouturbs[k].urb;
949                 if (!urb) {
950                         rc = -EFAULT;
951                         goto error;
952                 }
953                 urb->dev = bcs->cs->hw.bas->udev;
954                 urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
955                 urb->transfer_flags = URB_ISO_ASAP;
956                 urb->transfer_buffer = ubc->isooutbuf->data;
957                 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
958                 urb->number_of_packets = BAS_NUMFRAMES;
959                 urb->interval = BAS_FRAMETIME;
960                 urb->complete = write_iso_callback;
961                 urb->context = &ubc->isoouturbs[k];
962                 for (j = 0; j < BAS_NUMFRAMES; ++j) {
963                         urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
964                         urb->iso_frame_desc[j].length = BAS_NORMFRAME;
965                         urb->iso_frame_desc[j].status = 0;
966                         urb->iso_frame_desc[j].actual_length = 0;
967                 }
968                 ubc->isoouturbs[k].limit = -1;
969         }
970
971         /* keep one URB free, submit the others */
972         for (k = 0; k < BAS_OUTURBS-1; ++k) {
973                 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
974                 rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
975                 if (rc != 0)
976                         goto error;
977         }
978         dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
979         ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS-1];
980         ubc->isooutdone = ubc->isooutovfl = NULL;
981         return 0;
982  error:
983         stopurbs(ubc);
984         return rc;
985 }
986
987 /* stopurbs
988  * cancel the USB request blocks for isochronous input and output
989  * errors are silently ignored
990  * argument:
991  *      B channel control structure
992  */
993 static void stopurbs(struct bas_bc_state *ubc)
994 {
995         int k, rc;
996
997         ubc->running = 0;
998
999         for (k = 0; k < BAS_INURBS; ++k) {
1000                 rc = usb_unlink_urb(ubc->isoinurbs[k]);
1001                 gig_dbg(DEBUG_ISO,
1002                         "%s: isoc input URB %d unlinked, result = %s",
1003                         __func__, k, get_usb_rcmsg(rc));
1004         }
1005
1006         for (k = 0; k < BAS_OUTURBS; ++k) {
1007                 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1008                 gig_dbg(DEBUG_ISO,
1009                         "%s: isoc output URB %d unlinked, result = %s",
1010                         __func__, k, get_usb_rcmsg(rc));
1011         }
1012 }
1013
1014 /* Isochronous Write - Bottom Half */
1015 /* =============================== */
1016
1017 /* submit_iso_write_urb
1018  * fill and submit the next isochronous write URB
1019  * parameters:
1020  *      ucx     context structure containing URB
1021  * return value:
1022  *      number of frames submitted in URB
1023  *      0 if URB not submitted because no data available (isooutbuf busy)
1024  *      error code < 0 on error
1025  */
1026 static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
1027 {
1028         struct urb *urb = ucx->urb;
1029         struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1030         struct usb_iso_packet_descriptor *ifd;
1031         int corrbytes, nframe, rc;
1032
1033         /* urb->dev is clobbered by USB subsystem */
1034         urb->dev = ucx->bcs->cs->hw.bas->udev;
1035         urb->transfer_flags = URB_ISO_ASAP;
1036         urb->transfer_buffer = ubc->isooutbuf->data;
1037         urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1038
1039         for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1040                 ifd = &urb->iso_frame_desc[nframe];
1041
1042                 /* compute frame length according to flow control */
1043                 ifd->length = BAS_NORMFRAME;
1044                 if ((corrbytes = atomic_read(&ubc->corrbytes)) != 0) {
1045                         gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1046                                 __func__, corrbytes);
1047                         if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1048                                 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1049                         else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1050                                 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1051                         ifd->length += corrbytes;
1052                         atomic_add(-corrbytes, &ubc->corrbytes);
1053                 }
1054
1055                 /* retrieve block of data to send */
1056                 rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
1057                 if (rc < 0) {
1058                         if (rc == -EBUSY) {
1059                                 gig_dbg(DEBUG_ISO,
1060                                         "%s: buffer busy at frame %d",
1061                                         __func__, nframe);
1062                                 /* tasklet will be restarted from
1063                                    gigaset_send_skb() */
1064                         } else {
1065                                 dev_err(ucx->bcs->cs->dev,
1066                                         "%s: buffer error %d at frame %d\n",
1067                                         __func__, rc, nframe);
1068                                 return rc;
1069                         }
1070                         break;
1071                 }
1072                 ifd->offset = rc;
1073                 ucx->limit = ubc->isooutbuf->nextread;
1074                 ifd->status = 0;
1075                 ifd->actual_length = 0;
1076         }
1077         if (unlikely(nframe == 0))
1078                 return 0;       /* no data to send */
1079         urb->number_of_packets = nframe;
1080
1081         rc = usb_submit_urb(urb, GFP_ATOMIC);
1082         if (unlikely(rc)) {
1083                 if (rc == -ENODEV)
1084                         /* device removed - give up silently */
1085                         gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1086                 else
1087                         dev_err(ucx->bcs->cs->dev,
1088                                 "could not submit isochronous write URB: %s\n",
1089                                 get_usb_rcmsg(rc));
1090                 return rc;
1091         }
1092         ++ubc->numsub;
1093         return nframe;
1094 }
1095
1096 /* write_iso_tasklet
1097  * tasklet scheduled when an isochronous output URB from the Gigaset device
1098  * has completed
1099  * parameter:
1100  *      data    B channel state structure
1101  */
1102 static void write_iso_tasklet(unsigned long data)
1103 {
1104         struct bc_state *bcs = (struct bc_state *) data;
1105         struct bas_bc_state *ubc = bcs->hw.bas;
1106         struct cardstate *cs = bcs->cs;
1107         struct isow_urbctx_t *done, *next, *ovfl;
1108         struct urb *urb;
1109         int status;
1110         struct usb_iso_packet_descriptor *ifd;
1111         int offset;
1112         unsigned long flags;
1113         int i;
1114         struct sk_buff *skb;
1115         int len;
1116         int rc;
1117
1118         /* loop while completed URBs arrive in time */
1119         for (;;) {
1120                 if (unlikely(!(ubc->running))) {
1121                         gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1122                         return;
1123                 }
1124
1125                 /* retrieve completed URBs */
1126                 spin_lock_irqsave(&ubc->isooutlock, flags);
1127                 done = ubc->isooutdone;
1128                 ubc->isooutdone = NULL;
1129                 ovfl = ubc->isooutovfl;
1130                 ubc->isooutovfl = NULL;
1131                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1132                 if (ovfl) {
1133                         dev_err(cs->dev, "isochronous write buffer underrun\n");
1134                         error_hangup(bcs);
1135                         break;
1136                 }
1137                 if (!done)
1138                         break;
1139
1140                 /* submit free URB if available */
1141                 spin_lock_irqsave(&ubc->isooutlock, flags);
1142                 next = ubc->isooutfree;
1143                 ubc->isooutfree = NULL;
1144                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1145                 if (next) {
1146                         rc = submit_iso_write_urb(next);
1147                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1148                                 /* could not submit URB, put it back */
1149                                 spin_lock_irqsave(&ubc->isooutlock, flags);
1150                                 if (ubc->isooutfree == NULL) {
1151                                         ubc->isooutfree = next;
1152                                         next = NULL;
1153                                 }
1154                                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1155                                 if (next) {
1156                                         /* couldn't put it back */
1157                                         dev_err(cs->dev,
1158                                               "losing isochronous write URB\n");
1159                                         error_hangup(bcs);
1160                                 }
1161                         }
1162                 }
1163
1164                 /* process completed URB */
1165                 urb = done->urb;
1166                 status = done->status;
1167                 switch (status) {
1168                 case -EXDEV:                    /* partial completion */
1169                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1170                                 __func__);
1171                         /* fall through - what's the difference anyway? */
1172                 case 0:                         /* normal completion */
1173                         /* inspect individual frames
1174                          * assumptions (for lack of documentation):
1175                          * - actual_length bytes of first frame in error are
1176                          *   successfully sent
1177                          * - all following frames are not sent at all
1178                          */
1179                         offset = done->limit;   /* default (no error) */
1180                         for (i = 0; i < BAS_NUMFRAMES; i++) {
1181                                 ifd = &urb->iso_frame_desc[i];
1182                                 if (ifd->status ||
1183                                     ifd->actual_length != ifd->length) {
1184                                         dev_warn(cs->dev,
1185                                              "isochronous write: frame %d: %s, "
1186                                              "only %d of %d bytes sent\n",
1187                                              i, get_usb_statmsg(ifd->status),
1188                                              ifd->actual_length, ifd->length);
1189                                         offset = (ifd->offset +
1190                                                   ifd->actual_length)
1191                                                  % BAS_OUTBUFSIZE;
1192                                         break;
1193                                 }
1194                         }
1195 #ifdef CONFIG_GIGASET_DEBUG
1196                         /* check assumption on remaining frames */
1197                         for (; i < BAS_NUMFRAMES; i++) {
1198                                 ifd = &urb->iso_frame_desc[i];
1199                                 if (ifd->status != -EINPROGRESS
1200                                     || ifd->actual_length != 0) {
1201                                         dev_warn(cs->dev,
1202                                              "isochronous write: frame %d: %s, "
1203                                              "%d of %d bytes sent\n",
1204                                              i, get_usb_statmsg(ifd->status),
1205                                              ifd->actual_length, ifd->length);
1206                                         offset = (ifd->offset +
1207                                                   ifd->actual_length)
1208                                                  % BAS_OUTBUFSIZE;
1209                                         break;
1210                                 }
1211                         }
1212 #endif
1213                         break;
1214                 case -EPIPE:                    /* stall - probably underrun */
1215                         dev_err(cs->dev, "isochronous write stalled\n");
1216                         error_hangup(bcs);
1217                         break;
1218                 default:                        /* severe trouble */
1219                         dev_warn(cs->dev, "isochronous write: %s\n",
1220                                  get_usb_statmsg(status));
1221                 }
1222
1223                 /* mark the write buffer area covered by this URB as free */
1224                 if (done->limit >= 0)
1225                         ubc->isooutbuf->read = done->limit;
1226
1227                 /* mark URB as free */
1228                 spin_lock_irqsave(&ubc->isooutlock, flags);
1229                 next = ubc->isooutfree;
1230                 ubc->isooutfree = done;
1231                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1232                 if (next) {
1233                         /* only one URB still active - resubmit one */
1234                         rc = submit_iso_write_urb(next);
1235                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1236                                 /* couldn't submit */
1237                                 error_hangup(bcs);
1238                         }
1239                 }
1240         }
1241
1242         /* process queued SKBs */
1243         while ((skb = skb_dequeue(&bcs->squeue))) {
1244                 /* copy to output buffer, doing L2 encapsulation */
1245                 len = skb->len;
1246                 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1247                         /* insufficient buffer space, push back onto queue */
1248                         skb_queue_head(&bcs->squeue, skb);
1249                         gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1250                                 __func__, skb_queue_len(&bcs->squeue));
1251                         break;
1252                 }
1253                 skb_pull(skb, len);
1254                 gigaset_skb_sent(bcs, skb);
1255                 dev_kfree_skb_any(skb);
1256         }
1257 }
1258
1259 /* Isochronous Read - Bottom Half */
1260 /* ============================== */
1261
1262 /* read_iso_tasklet
1263  * tasklet scheduled when an isochronous input URB from the Gigaset device
1264  * has completed
1265  * parameter:
1266  *      data    B channel state structure
1267  */
1268 static void read_iso_tasklet(unsigned long data)
1269 {
1270         struct bc_state *bcs = (struct bc_state *) data;
1271         struct bas_bc_state *ubc = bcs->hw.bas;
1272         struct cardstate *cs = bcs->cs;
1273         struct urb *urb;
1274         int status;
1275         char *rcvbuf;
1276         unsigned long flags;
1277         int totleft, numbytes, offset, frame, rc;
1278
1279         /* loop while more completed URBs arrive in the meantime */
1280         for (;;) {
1281                 /* retrieve URB */
1282                 spin_lock_irqsave(&ubc->isoinlock, flags);
1283                 if (!(urb = ubc->isoindone)) {
1284                         spin_unlock_irqrestore(&ubc->isoinlock, flags);
1285                         return;
1286                 }
1287                 status = ubc->isoinstatus;
1288                 ubc->isoindone = NULL;
1289                 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1290                         dev_warn(cs->dev,
1291                                  "isochronous read overrun, "
1292                                  "dropped URB with status: %s, %d bytes lost\n",
1293                                  get_usb_statmsg(ubc->loststatus),
1294                                  ubc->isoinlost);
1295                         ubc->loststatus = -EINPROGRESS;
1296                 }
1297                 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1298
1299                 if (unlikely(!(ubc->running))) {
1300                         gig_dbg(DEBUG_ISO,
1301                                 "%s: channel not running, "
1302                                 "dropped URB with status: %s",
1303                                 __func__, get_usb_statmsg(status));
1304                         return;
1305                 }
1306
1307                 switch (status) {
1308                 case 0:                         /* normal completion */
1309                         break;
1310                 case -EXDEV:                    /* inspect individual frames
1311                                                    (we do that anyway) */
1312                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1313                                 __func__);
1314                         break;
1315                 case -ENOENT:
1316                 case -ECONNRESET:
1317                 case -EINPROGRESS:
1318                         gig_dbg(DEBUG_ISO, "%s: %s",
1319                                 __func__, get_usb_statmsg(status));
1320                         continue;               /* -> skip */
1321                 case -EPIPE:
1322                         dev_err(cs->dev, "isochronous read stalled\n");
1323                         error_hangup(bcs);
1324                         continue;               /* -> skip */
1325                 default:                        /* severe trouble */
1326                         dev_warn(cs->dev, "isochronous read: %s\n",
1327                                  get_usb_statmsg(status));
1328                         goto error;
1329                 }
1330
1331                 rcvbuf = urb->transfer_buffer;
1332                 totleft = urb->actual_length;
1333                 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1334                         numbytes = urb->iso_frame_desc[frame].actual_length;
1335                         if (unlikely(urb->iso_frame_desc[frame].status))
1336                                 dev_warn(cs->dev,
1337                                          "isochronous read: frame %d[%d]: %s\n",
1338                                          frame, numbytes,
1339                                          get_usb_statmsg(
1340                                             urb->iso_frame_desc[frame].status));
1341                         if (unlikely(numbytes > BAS_MAXFRAME))
1342                                 dev_warn(cs->dev,
1343                                          "isochronous read: frame %d: "
1344                                          "numbytes (%d) > BAS_MAXFRAME\n",
1345                                          frame, numbytes);
1346                         if (unlikely(numbytes > totleft)) {
1347                                 dev_warn(cs->dev,
1348                                          "isochronous read: frame %d: "
1349                                          "numbytes (%d) > totleft (%d)\n",
1350                                          frame, numbytes, totleft);
1351                                 numbytes = totleft;
1352                         }
1353                         offset = urb->iso_frame_desc[frame].offset;
1354                         if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1355                                 dev_warn(cs->dev,
1356                                          "isochronous read: frame %d: "
1357                                          "offset (%d) + numbytes (%d) "
1358                                          "> BAS_INBUFSIZE\n",
1359                                          frame, offset, numbytes);
1360                                 numbytes = BAS_INBUFSIZE - offset;
1361                         }
1362                         gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1363                         totleft -= numbytes;
1364                 }
1365                 if (unlikely(totleft > 0))
1366                         dev_warn(cs->dev,
1367                                  "isochronous read: %d data bytes missing\n",
1368                                  totleft);
1369
1370         error:
1371                 /* URB processed, resubmit */
1372                 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1373                         urb->iso_frame_desc[frame].status = 0;
1374                         urb->iso_frame_desc[frame].actual_length = 0;
1375                 }
1376                 /* urb->dev is clobbered by USB subsystem */
1377                 urb->dev = bcs->cs->hw.bas->udev;
1378                 urb->transfer_flags = URB_ISO_ASAP;
1379                 urb->number_of_packets = BAS_NUMFRAMES;
1380                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1381                 if (unlikely(rc != 0 && rc != -ENODEV)) {
1382                         dev_err(cs->dev,
1383                                 "could not resubmit isochronous read URB: %s\n",
1384                                 get_usb_rcmsg(rc));
1385                         dump_urb(DEBUG_ISO, "resubmit iso read", urb);
1386                         error_hangup(bcs);
1387                 }
1388         }
1389 }
1390
1391 /* Channel Operations */
1392 /* ================== */
1393
1394 /* req_timeout
1395  * timeout routine for control output request
1396  * argument:
1397  *      B channel control structure
1398  */
1399 static void req_timeout(unsigned long data)
1400 {
1401         struct bc_state *bcs = (struct bc_state *) data;
1402         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1403         int pending;
1404         unsigned long flags;
1405
1406         check_pending(ucs);
1407
1408         spin_lock_irqsave(&ucs->lock, flags);
1409         pending = ucs->pending;
1410         ucs->pending = 0;
1411         spin_unlock_irqrestore(&ucs->lock, flags);
1412
1413         switch (pending) {
1414         case 0:                                 /* no pending request */
1415                 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1416                 break;
1417
1418         case HD_OPEN_ATCHANNEL:
1419                 dev_err(bcs->cs->dev, "timeout opening AT channel\n");
1420                 error_reset(bcs->cs);
1421                 break;
1422
1423         case HD_OPEN_B2CHANNEL:
1424         case HD_OPEN_B1CHANNEL:
1425                 dev_err(bcs->cs->dev, "timeout opening channel %d\n",
1426                         bcs->channel + 1);
1427                 error_hangup(bcs);
1428                 break;
1429
1430         case HD_CLOSE_ATCHANNEL:
1431                 dev_err(bcs->cs->dev, "timeout closing AT channel\n");
1432                 break;
1433
1434         case HD_CLOSE_B2CHANNEL:
1435         case HD_CLOSE_B1CHANNEL:
1436                 dev_err(bcs->cs->dev, "timeout closing channel %d\n",
1437                         bcs->channel + 1);
1438                 error_reset(bcs->cs);
1439                 break;
1440
1441         default:
1442                 dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
1443                          pending);
1444         }
1445
1446         wake_up(&ucs->waitqueue);
1447 }
1448
1449 /* write_ctrl_callback
1450  * USB completion handler for control pipe output
1451  * called by the USB subsystem in interrupt context
1452  * parameter:
1453  *      urb     USB request block of completed request
1454  *              urb->context = hardware specific controller state structure
1455  */
1456 static void write_ctrl_callback(struct urb *urb)
1457 {
1458         struct bas_cardstate *ucs = urb->context;
1459         int status = urb->status;
1460         int rc;
1461         unsigned long flags;
1462
1463         /* check status */
1464         switch (status) {
1465         case 0:                                 /* normal completion */
1466                 spin_lock_irqsave(&ucs->lock, flags);
1467                 switch (ucs->pending) {
1468                 case HD_DEVICE_INIT_ACK:        /* no reply expected */
1469                         del_timer(&ucs->timer_ctrl);
1470                         ucs->pending = 0;
1471                         break;
1472                 }
1473                 spin_unlock_irqrestore(&ucs->lock, flags);
1474                 return;
1475
1476         case -ENOENT:                   /* cancelled */
1477         case -ECONNRESET:               /* cancelled (async) */
1478         case -EINPROGRESS:              /* pending */
1479         case -ENODEV:                   /* device removed */
1480         case -ESHUTDOWN:                /* device shut down */
1481                 /* ignore silently */
1482                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1483                         __func__, get_usb_statmsg(status));
1484                 break;
1485
1486         default:                                /* any failure */
1487                 /* don't retry if suspend requested */
1488                 if (++ucs->retry_ctrl > BAS_RETRY ||
1489                     (ucs->basstate & BS_SUSPEND)) {
1490                         dev_err(&ucs->interface->dev,
1491                                 "control request 0x%02x failed: %s\n",
1492                                 ucs->dr_ctrl.bRequest,
1493                                 get_usb_statmsg(status));
1494                         break;          /* give up */
1495                 }
1496                 dev_notice(&ucs->interface->dev,
1497                            "control request 0x%02x: %s, retry %d\n",
1498                            ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1499                            ucs->retry_ctrl);
1500                 /* urb->dev is clobbered by USB subsystem */
1501                 urb->dev = ucs->udev;
1502                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1503                 if (unlikely(rc)) {
1504                         dev_err(&ucs->interface->dev,
1505                                 "could not resubmit request 0x%02x: %s\n",
1506                                 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1507                         break;
1508                 }
1509                 /* resubmitted */
1510                 return;
1511         }
1512
1513         /* failed, clear pending request */
1514         spin_lock_irqsave(&ucs->lock, flags);
1515         del_timer(&ucs->timer_ctrl);
1516         ucs->pending = 0;
1517         spin_unlock_irqrestore(&ucs->lock, flags);
1518         wake_up(&ucs->waitqueue);
1519 }
1520
1521 /* req_submit
1522  * submit a control output request without message buffer to the Gigaset base
1523  * and optionally start a timeout
1524  * parameters:
1525  *      bcs     B channel control structure
1526  *      req     control request code (HD_*)
1527  *      val     control request parameter value (set to 0 if unused)
1528  *      timeout timeout in seconds (0: no timeout)
1529  * return value:
1530  *      0 on success
1531  *      -EBUSY if another request is pending
1532  *      any URB submission error code
1533  */
1534 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1535 {
1536         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1537         int ret;
1538         unsigned long flags;
1539
1540         gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1541
1542         spin_lock_irqsave(&ucs->lock, flags);
1543         if (ucs->pending) {
1544                 spin_unlock_irqrestore(&ucs->lock, flags);
1545                 dev_err(bcs->cs->dev,
1546                         "submission of request 0x%02x failed: "
1547                         "request 0x%02x still pending\n",
1548                         req, ucs->pending);
1549                 return -EBUSY;
1550         }
1551
1552         ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1553         ucs->dr_ctrl.bRequest = req;
1554         ucs->dr_ctrl.wValue = cpu_to_le16(val);
1555         ucs->dr_ctrl.wIndex = 0;
1556         ucs->dr_ctrl.wLength = 0;
1557         usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1558                              usb_sndctrlpipe(ucs->udev, 0),
1559                              (unsigned char*) &ucs->dr_ctrl, NULL, 0,
1560                              write_ctrl_callback, ucs);
1561         ucs->retry_ctrl = 0;
1562         ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1563         if (unlikely(ret)) {
1564                 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1565                         req, get_usb_rcmsg(ret));
1566                 spin_unlock_irqrestore(&ucs->lock, flags);
1567                 return ret;
1568         }
1569         ucs->pending = req;
1570
1571         if (timeout > 0) {
1572                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1573                 ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
1574                 ucs->timer_ctrl.data = (unsigned long) bcs;
1575                 ucs->timer_ctrl.function = req_timeout;
1576                 add_timer(&ucs->timer_ctrl);
1577         }
1578
1579         spin_unlock_irqrestore(&ucs->lock, flags);
1580         return 0;
1581 }
1582
1583 /* gigaset_init_bchannel
1584  * called by common.c to connect a B channel
1585  * initialize isochronous I/O and tell the Gigaset base to open the channel
1586  * argument:
1587  *      B channel control structure
1588  * return value:
1589  *      0 on success, error code < 0 on error
1590  */
1591 static int gigaset_init_bchannel(struct bc_state *bcs)
1592 {
1593         struct cardstate *cs = bcs->cs;
1594         int req, ret;
1595         unsigned long flags;
1596
1597         spin_lock_irqsave(&cs->lock, flags);
1598         if (unlikely(!cs->connected)) {
1599                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1600                 spin_unlock_irqrestore(&cs->lock, flags);
1601                 return -ENODEV;
1602         }
1603
1604         if (cs->hw.bas->basstate & BS_SUSPEND) {
1605                 dev_notice(cs->dev,
1606                            "not starting isochronous I/O, "
1607                            "suspend in progress\n");
1608                 spin_unlock_irqrestore(&cs->lock, flags);
1609                 return -EHOSTUNREACH;
1610         }
1611
1612         if ((ret = starturbs(bcs)) < 0) {
1613                 dev_err(cs->dev,
1614                         "could not start isochronous I/O for channel B%d: %s\n",
1615                         bcs->channel + 1,
1616                         ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1617                 if (ret != -ENODEV)
1618                         error_hangup(bcs);
1619                 spin_unlock_irqrestore(&cs->lock, flags);
1620                 return ret;
1621         }
1622
1623         req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1624         if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0) {
1625                 dev_err(cs->dev, "could not open channel B%d\n",
1626                         bcs->channel + 1);
1627                 stopurbs(bcs->hw.bas);
1628                 if (ret != -ENODEV)
1629                         error_hangup(bcs);
1630         }
1631
1632         spin_unlock_irqrestore(&cs->lock, flags);
1633         return ret;
1634 }
1635
1636 /* gigaset_close_bchannel
1637  * called by common.c to disconnect a B channel
1638  * tell the Gigaset base to close the channel
1639  * stopping isochronous I/O and LL notification will be done when the
1640  * acknowledgement for the close arrives
1641  * argument:
1642  *      B channel control structure
1643  * return value:
1644  *      0 on success, error code < 0 on error
1645  */
1646 static int gigaset_close_bchannel(struct bc_state *bcs)
1647 {
1648         struct cardstate *cs = bcs->cs;
1649         int req, ret;
1650         unsigned long flags;
1651
1652         spin_lock_irqsave(&cs->lock, flags);
1653         if (unlikely(!cs->connected)) {
1654                 spin_unlock_irqrestore(&cs->lock, flags);
1655                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1656                 return -ENODEV;
1657         }
1658
1659         if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1660                 /* channel not running: just signal common.c */
1661                 spin_unlock_irqrestore(&cs->lock, flags);
1662                 gigaset_bchannel_down(bcs);
1663                 return 0;
1664         }
1665
1666         /* channel running: tell device to close it */
1667         req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1668         if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0)
1669                 dev_err(cs->dev, "closing channel B%d failed\n",
1670                         bcs->channel + 1);
1671
1672         spin_unlock_irqrestore(&cs->lock, flags);
1673         return ret;
1674 }
1675
1676 /* Device Operations */
1677 /* ================= */
1678
1679 /* complete_cb
1680  * unqueue first command buffer from queue, waking any sleepers
1681  * must be called with cs->cmdlock held
1682  * parameter:
1683  *      cs      controller state structure
1684  */
1685 static void complete_cb(struct cardstate *cs)
1686 {
1687         struct cmdbuf_t *cb = cs->cmdbuf;
1688
1689         /* unqueue completed buffer */
1690         cs->cmdbytes -= cs->curlen;
1691         gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD,
1692                 "write_command: sent %u bytes, %u left",
1693                 cs->curlen, cs->cmdbytes);
1694         if ((cs->cmdbuf = cb->next) != NULL) {
1695                 cs->cmdbuf->prev = NULL;
1696                 cs->curlen = cs->cmdbuf->len;
1697         } else {
1698                 cs->lastcmdbuf = NULL;
1699                 cs->curlen = 0;
1700         }
1701
1702         if (cb->wake_tasklet)
1703                 tasklet_schedule(cb->wake_tasklet);
1704
1705         kfree(cb);
1706 }
1707
1708 /* write_command_callback
1709  * USB completion handler for AT command transmission
1710  * called by the USB subsystem in interrupt context
1711  * parameter:
1712  *      urb     USB request block of completed request
1713  *              urb->context = controller state structure
1714  */
1715 static void write_command_callback(struct urb *urb)
1716 {
1717         struct cardstate *cs = urb->context;
1718         struct bas_cardstate *ucs = cs->hw.bas;
1719         int status = urb->status;
1720         unsigned long flags;
1721
1722         update_basstate(ucs, 0, BS_ATWRPEND);
1723         wake_up(&ucs->waitqueue);
1724
1725         /* check status */
1726         switch (status) {
1727         case 0:                                 /* normal completion */
1728                 break;
1729         case -ENOENT:                   /* cancelled */
1730         case -ECONNRESET:               /* cancelled (async) */
1731         case -EINPROGRESS:              /* pending */
1732         case -ENODEV:                   /* device removed */
1733         case -ESHUTDOWN:                /* device shut down */
1734                 /* ignore silently */
1735                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1736                         __func__, get_usb_statmsg(status));
1737                 return;
1738         default:                                /* any failure */
1739                 if (++ucs->retry_cmd_out > BAS_RETRY) {
1740                         dev_warn(cs->dev,
1741                                  "command write: %s, "
1742                                  "giving up after %d retries\n",
1743                                  get_usb_statmsg(status),
1744                                  ucs->retry_cmd_out);
1745                         break;
1746                 }
1747                 if (ucs->basstate & BS_SUSPEND) {
1748                         dev_warn(cs->dev,
1749                                  "command write: %s, "
1750                                  "won't retry - suspend requested\n",
1751                                  get_usb_statmsg(status));
1752                         break;
1753                 }
1754                 if (cs->cmdbuf == NULL) {
1755                         dev_warn(cs->dev,
1756                                  "command write: %s, "
1757                                  "cannot retry - cmdbuf gone\n",
1758                                  get_usb_statmsg(status));
1759                         break;
1760                 }
1761                 dev_notice(cs->dev, "command write: %s, retry %d\n",
1762                            get_usb_statmsg(status), ucs->retry_cmd_out);
1763                 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1764                         /* resubmitted - bypass regular exit block */
1765                         return;
1766                 /* command send failed, assume base still waiting */
1767                 update_basstate(ucs, BS_ATREADY, 0);
1768         }
1769
1770         spin_lock_irqsave(&cs->cmdlock, flags);
1771         if (cs->cmdbuf != NULL)
1772                 complete_cb(cs);
1773         spin_unlock_irqrestore(&cs->cmdlock, flags);
1774 }
1775
1776 /* atrdy_timeout
1777  * timeout routine for AT command transmission
1778  * argument:
1779  *      controller state structure
1780  */
1781 static void atrdy_timeout(unsigned long data)
1782 {
1783         struct cardstate *cs = (struct cardstate *) data;
1784         struct bas_cardstate *ucs = cs->hw.bas;
1785
1786         dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1787
1788         /* fake the missing signal - what else can I do? */
1789         update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1790         start_cbsend(cs);
1791 }
1792
1793 /* atwrite_submit
1794  * submit an HD_WRITE_ATMESSAGE command URB
1795  * parameters:
1796  *      cs      controller state structure
1797  *      buf     buffer containing command to send
1798  *      len     length of command to send
1799  * return value:
1800  *      0 on success
1801  *      -EBUSY if another request is pending
1802  *      any URB submission error code
1803  */
1804 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1805 {
1806         struct bas_cardstate *ucs = cs->hw.bas;
1807         int rc;
1808
1809         gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1810
1811         if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1812                 dev_err(cs->dev,
1813                         "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1814                 return -EBUSY;
1815         }
1816
1817         ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1818         ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1819         ucs->dr_cmd_out.wValue = 0;
1820         ucs->dr_cmd_out.wIndex = 0;
1821         ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1822         usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1823                              usb_sndctrlpipe(ucs->udev, 0),
1824                              (unsigned char*) &ucs->dr_cmd_out, buf, len,
1825                              write_command_callback, cs);
1826         rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1827         if (unlikely(rc)) {
1828                 update_basstate(ucs, 0, BS_ATWRPEND);
1829                 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1830                         get_usb_rcmsg(rc));
1831                 return rc;
1832         }
1833
1834         /* submitted successfully, start timeout if necessary */
1835         if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1836                 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1837                         ATRDY_TIMEOUT);
1838                 ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
1839                 ucs->timer_atrdy.data = (unsigned long) cs;
1840                 ucs->timer_atrdy.function = atrdy_timeout;
1841                 add_timer(&ucs->timer_atrdy);
1842         }
1843         return 0;
1844 }
1845
1846 /* start_cbsend
1847  * start transmission of AT command queue if necessary
1848  * parameter:
1849  *      cs              controller state structure
1850  * return value:
1851  *      0 on success
1852  *      error code < 0 on error
1853  */
1854 static int start_cbsend(struct cardstate *cs)
1855 {
1856         struct cmdbuf_t *cb;
1857         struct bas_cardstate *ucs = cs->hw.bas;
1858         unsigned long flags;
1859         int rc;
1860         int retval = 0;
1861
1862         /* check if suspend requested */
1863         if (ucs->basstate & BS_SUSPEND) {
1864                 gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "suspending");
1865                 return -EHOSTUNREACH;
1866         }
1867
1868         /* check if AT channel is open */
1869         if (!(ucs->basstate & BS_ATOPEN)) {
1870                 gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "AT channel not open");
1871                 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1872                 if (rc < 0) {
1873                         /* flush command queue */
1874                         spin_lock_irqsave(&cs->cmdlock, flags);
1875                         while (cs->cmdbuf != NULL)
1876                                 complete_cb(cs);
1877                         spin_unlock_irqrestore(&cs->cmdlock, flags);
1878                 }
1879                 return rc;
1880         }
1881
1882         /* try to send first command in queue */
1883         spin_lock_irqsave(&cs->cmdlock, flags);
1884
1885         while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1886                 ucs->retry_cmd_out = 0;
1887                 rc = atwrite_submit(cs, cb->buf, cb->len);
1888                 if (unlikely(rc)) {
1889                         retval = rc;
1890                         complete_cb(cs);
1891                 }
1892         }
1893
1894         spin_unlock_irqrestore(&cs->cmdlock, flags);
1895         return retval;
1896 }
1897
1898 /* gigaset_write_cmd
1899  * This function is called by the device independent part of the driver
1900  * to transmit an AT command string to the Gigaset device.
1901  * It encapsulates the device specific method for transmission over the
1902  * direct USB connection to the base.
1903  * The command string is added to the queue of commands to send, and
1904  * USB transmission is started if necessary.
1905  * parameters:
1906  *      cs              controller state structure
1907  *      buf             command string to send
1908  *      len             number of bytes to send (max. IF_WRITEBUF)
1909  *      wake_tasklet    tasklet to run when transmission is completed
1910  *                      (NULL if none)
1911  * return value:
1912  *      number of bytes queued on success
1913  *      error code < 0 on error
1914  */
1915 static int gigaset_write_cmd(struct cardstate *cs,
1916                              const unsigned char *buf, int len,
1917                              struct tasklet_struct *wake_tasklet)
1918 {
1919         struct cmdbuf_t *cb;
1920         unsigned long flags;
1921         int rc;
1922
1923         gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1924                              DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1925                            "CMD Transmit", len, buf);
1926
1927         if (len <= 0) {
1928                 /* nothing to do */
1929                 rc = 0;
1930                 goto notqueued;
1931         }
1932
1933         if (len > IF_WRITEBUF)
1934                 len = IF_WRITEBUF;
1935         if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) {
1936                 dev_err(cs->dev, "%s: out of memory\n", __func__);
1937                 rc = -ENOMEM;
1938                 goto notqueued;
1939         }
1940
1941         memcpy(cb->buf, buf, len);
1942         cb->len = len;
1943         cb->offset = 0;
1944         cb->next = NULL;
1945         cb->wake_tasklet = wake_tasklet;
1946
1947         spin_lock_irqsave(&cs->cmdlock, flags);
1948         cb->prev = cs->lastcmdbuf;
1949         if (cs->lastcmdbuf)
1950                 cs->lastcmdbuf->next = cb;
1951         else {
1952                 cs->cmdbuf = cb;
1953                 cs->curlen = len;
1954         }
1955         cs->cmdbytes += len;
1956         cs->lastcmdbuf = cb;
1957         spin_unlock_irqrestore(&cs->cmdlock, flags);
1958
1959         spin_lock_irqsave(&cs->lock, flags);
1960         if (unlikely(!cs->connected)) {
1961                 spin_unlock_irqrestore(&cs->lock, flags);
1962                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1963                 /* flush command queue */
1964                 spin_lock_irqsave(&cs->cmdlock, flags);
1965                 while (cs->cmdbuf != NULL)
1966                         complete_cb(cs);
1967                 spin_unlock_irqrestore(&cs->cmdlock, flags);
1968                 return -ENODEV;
1969         }
1970         rc = start_cbsend(cs);
1971         spin_unlock_irqrestore(&cs->lock, flags);
1972         return rc < 0 ? rc : len;
1973
1974 notqueued:                      /* request handled without queuing */
1975         if (wake_tasklet)
1976                 tasklet_schedule(wake_tasklet);
1977         return rc;
1978 }
1979
1980 /* gigaset_write_room
1981  * tty_driver.write_room interface routine
1982  * return number of characters the driver will accept to be written via
1983  * gigaset_write_cmd
1984  * parameter:
1985  *      controller state structure
1986  * return value:
1987  *      number of characters
1988  */
1989 static int gigaset_write_room(struct cardstate *cs)
1990 {
1991         return IF_WRITEBUF;
1992 }
1993
1994 /* gigaset_chars_in_buffer
1995  * tty_driver.chars_in_buffer interface routine
1996  * return number of characters waiting to be sent
1997  * parameter:
1998  *      controller state structure
1999  * return value:
2000  *      number of characters
2001  */
2002 static int gigaset_chars_in_buffer(struct cardstate *cs)
2003 {
2004         return cs->cmdbytes;
2005 }
2006
2007 /* gigaset_brkchars
2008  * implementation of ioctl(GIGASET_BRKCHARS)
2009  * parameter:
2010  *      controller state structure
2011  * return value:
2012  *      -EINVAL (unimplemented function)
2013  */
2014 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
2015 {
2016         return -EINVAL;
2017 }
2018
2019
2020 /* Device Initialization/Shutdown */
2021 /* ============================== */
2022
2023 /* Free hardware dependent part of the B channel structure
2024  * parameter:
2025  *      bcs     B channel structure
2026  * return value:
2027  *      !=0 on success
2028  */
2029 static int gigaset_freebcshw(struct bc_state *bcs)
2030 {
2031         struct bas_bc_state *ubc = bcs->hw.bas;
2032         int i;
2033
2034         if (!ubc)
2035                 return 0;
2036
2037         /* kill URBs and tasklets before freeing - better safe than sorry */
2038         ubc->running = 0;
2039         gig_dbg(DEBUG_INIT, "%s: killing iso URBs", __func__);
2040         for (i = 0; i < BAS_OUTURBS; ++i) {
2041                 usb_kill_urb(ubc->isoouturbs[i].urb);
2042                 usb_free_urb(ubc->isoouturbs[i].urb);
2043         }
2044         for (i = 0; i < BAS_INURBS; ++i) {
2045                 usb_kill_urb(ubc->isoinurbs[i]);
2046                 usb_free_urb(ubc->isoinurbs[i]);
2047         }
2048         tasklet_kill(&ubc->sent_tasklet);
2049         tasklet_kill(&ubc->rcvd_tasklet);
2050         kfree(ubc->isooutbuf);
2051         kfree(ubc);
2052         bcs->hw.bas = NULL;
2053         return 1;
2054 }
2055
2056 /* Initialize hardware dependent part of the B channel structure
2057  * parameter:
2058  *      bcs     B channel structure
2059  * return value:
2060  *      !=0 on success
2061  */
2062 static int gigaset_initbcshw(struct bc_state *bcs)
2063 {
2064         int i;
2065         struct bas_bc_state *ubc;
2066
2067         bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2068         if (!ubc) {
2069                 pr_err("out of memory\n");
2070                 return 0;
2071         }
2072
2073         ubc->running = 0;
2074         atomic_set(&ubc->corrbytes, 0);
2075         spin_lock_init(&ubc->isooutlock);
2076         for (i = 0; i < BAS_OUTURBS; ++i) {
2077                 ubc->isoouturbs[i].urb = NULL;
2078                 ubc->isoouturbs[i].bcs = bcs;
2079         }
2080         ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2081         ubc->numsub = 0;
2082         if (!(ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL))) {
2083                 pr_err("out of memory\n");
2084                 kfree(ubc);
2085                 bcs->hw.bas = NULL;
2086                 return 0;
2087         }
2088         tasklet_init(&ubc->sent_tasklet,
2089                      &write_iso_tasklet, (unsigned long) bcs);
2090
2091         spin_lock_init(&ubc->isoinlock);
2092         for (i = 0; i < BAS_INURBS; ++i)
2093                 ubc->isoinurbs[i] = NULL;
2094         ubc->isoindone = NULL;
2095         ubc->loststatus = -EINPROGRESS;
2096         ubc->isoinlost = 0;
2097         ubc->seqlen = 0;
2098         ubc->inbyte = 0;
2099         ubc->inbits = 0;
2100         ubc->goodbytes = 0;
2101         ubc->alignerrs = 0;
2102         ubc->fcserrs = 0;
2103         ubc->frameerrs = 0;
2104         ubc->giants = 0;
2105         ubc->runts = 0;
2106         ubc->aborts = 0;
2107         ubc->shared0s = 0;
2108         ubc->stolen0s = 0;
2109         tasklet_init(&ubc->rcvd_tasklet,
2110                      &read_iso_tasklet, (unsigned long) bcs);
2111         return 1;
2112 }
2113
2114 static void gigaset_reinitbcshw(struct bc_state *bcs)
2115 {
2116         struct bas_bc_state *ubc = bcs->hw.bas;
2117
2118         bcs->hw.bas->running = 0;
2119         atomic_set(&bcs->hw.bas->corrbytes, 0);
2120         bcs->hw.bas->numsub = 0;
2121         spin_lock_init(&ubc->isooutlock);
2122         spin_lock_init(&ubc->isoinlock);
2123         ubc->loststatus = -EINPROGRESS;
2124 }
2125
2126 static void gigaset_freecshw(struct cardstate *cs)
2127 {
2128         /* timers, URBs and rcvbuf are disposed of in disconnect */
2129         kfree(cs->hw.bas->int_in_buf);
2130         kfree(cs->hw.bas);
2131         cs->hw.bas = NULL;
2132 }
2133
2134 static int gigaset_initcshw(struct cardstate *cs)
2135 {
2136         struct bas_cardstate *ucs;
2137
2138         cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2139         if (!ucs) {
2140                 pr_err("out of memory\n");
2141                 return 0;
2142         }
2143         ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
2144         if (!ucs->int_in_buf) {
2145                 kfree(ucs);
2146                 pr_err("out of memory\n");
2147                 return 0;
2148         }
2149
2150         ucs->urb_cmd_in = NULL;
2151         ucs->urb_cmd_out = NULL;
2152         ucs->rcvbuf = NULL;
2153         ucs->rcvbuf_size = 0;
2154
2155         spin_lock_init(&ucs->lock);
2156         ucs->pending = 0;
2157
2158         ucs->basstate = 0;
2159         init_timer(&ucs->timer_ctrl);
2160         init_timer(&ucs->timer_atrdy);
2161         init_timer(&ucs->timer_cmd_in);
2162         init_waitqueue_head(&ucs->waitqueue);
2163
2164         return 1;
2165 }
2166
2167 /* freeurbs
2168  * unlink and deallocate all URBs unconditionally
2169  * caller must make sure that no commands are still in progress
2170  * parameter:
2171  *      cs      controller state structure
2172  */
2173 static void freeurbs(struct cardstate *cs)
2174 {
2175         struct bas_cardstate *ucs = cs->hw.bas;
2176         struct bas_bc_state *ubc;
2177         int i, j;
2178
2179         gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2180         for (j = 0; j < BAS_CHANNELS; ++j) {
2181                 ubc = cs->bcs[j].hw.bas;
2182                 for (i = 0; i < BAS_OUTURBS; ++i) {
2183                         usb_kill_urb(ubc->isoouturbs[i].urb);
2184                         usb_free_urb(ubc->isoouturbs[i].urb);
2185                         ubc->isoouturbs[i].urb = NULL;
2186                 }
2187                 for (i = 0; i < BAS_INURBS; ++i) {
2188                         usb_kill_urb(ubc->isoinurbs[i]);
2189                         usb_free_urb(ubc->isoinurbs[i]);
2190                         ubc->isoinurbs[i] = NULL;
2191                 }
2192         }
2193         usb_kill_urb(ucs->urb_int_in);
2194         usb_free_urb(ucs->urb_int_in);
2195         ucs->urb_int_in = NULL;
2196         usb_kill_urb(ucs->urb_cmd_out);
2197         usb_free_urb(ucs->urb_cmd_out);
2198         ucs->urb_cmd_out = NULL;
2199         usb_kill_urb(ucs->urb_cmd_in);
2200         usb_free_urb(ucs->urb_cmd_in);
2201         ucs->urb_cmd_in = NULL;
2202         usb_kill_urb(ucs->urb_ctrl);
2203         usb_free_urb(ucs->urb_ctrl);
2204         ucs->urb_ctrl = NULL;
2205 }
2206
2207 /* gigaset_probe
2208  * This function is called when a new USB device is connected.
2209  * It checks whether the new device is handled by this driver.
2210  */
2211 static int gigaset_probe(struct usb_interface *interface,
2212                          const struct usb_device_id *id)
2213 {
2214         struct usb_host_interface *hostif;
2215         struct usb_device *udev = interface_to_usbdev(interface);
2216         struct cardstate *cs = NULL;
2217         struct bas_cardstate *ucs = NULL;
2218         struct bas_bc_state *ubc;
2219         struct usb_endpoint_descriptor *endpoint;
2220         int i, j;
2221         int rc;
2222
2223         gig_dbg(DEBUG_ANY,
2224                 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2225                 __func__, le16_to_cpu(udev->descriptor.idVendor),
2226                 le16_to_cpu(udev->descriptor.idProduct));
2227
2228         /* set required alternate setting */
2229         hostif = interface->cur_altsetting;
2230         if (hostif->desc.bAlternateSetting != 3) {
2231                 gig_dbg(DEBUG_ANY,
2232                         "%s: wrong alternate setting %d - trying to switch",
2233                         __func__, hostif->desc.bAlternateSetting);
2234                 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3) < 0) {
2235                         dev_warn(&udev->dev, "usb_set_interface failed, "
2236                                  "device %d interface %d altsetting %d\n",
2237                                  udev->devnum, hostif->desc.bInterfaceNumber,
2238                                  hostif->desc.bAlternateSetting);
2239                         return -ENODEV;
2240                 }
2241                 hostif = interface->cur_altsetting;
2242         }
2243
2244         /* Reject application specific interfaces
2245          */
2246         if (hostif->desc.bInterfaceClass != 255) {
2247                 dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2248                          __func__, hostif->desc.bInterfaceClass);
2249                 return -ENODEV;
2250         }
2251
2252         dev_info(&udev->dev,
2253                  "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2254                  __func__, le16_to_cpu(udev->descriptor.idVendor),
2255                  le16_to_cpu(udev->descriptor.idProduct));
2256
2257         /* allocate memory for our device state and intialize it */
2258         cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
2259                             GIGASET_MODULENAME);
2260         if (!cs)
2261                 return -ENODEV;
2262         ucs = cs->hw.bas;
2263
2264         /* save off device structure ptrs for later use */
2265         usb_get_dev(udev);
2266         ucs->udev = udev;
2267         ucs->interface = interface;
2268         cs->dev = &interface->dev;
2269
2270         /* allocate URBs:
2271          * - one for the interrupt pipe
2272          * - three for the different uses of the default control pipe
2273          * - three for each isochronous pipe
2274          */
2275         if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2276             !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2277             !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
2278             !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2279                 goto allocerr;
2280
2281         for (j = 0; j < BAS_CHANNELS; ++j) {
2282                 ubc = cs->bcs[j].hw.bas;
2283                 for (i = 0; i < BAS_OUTURBS; ++i)
2284                         if (!(ubc->isoouturbs[i].urb =
2285                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2286                                 goto allocerr;
2287                 for (i = 0; i < BAS_INURBS; ++i)
2288                         if (!(ubc->isoinurbs[i] =
2289                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2290                                 goto allocerr;
2291         }
2292
2293         ucs->rcvbuf = NULL;
2294         ucs->rcvbuf_size = 0;
2295
2296         /* Fill the interrupt urb and send it to the core */
2297         endpoint = &hostif->endpoint[0].desc;
2298         usb_fill_int_urb(ucs->urb_int_in, udev,
2299                          usb_rcvintpipe(udev,
2300                                         (endpoint->bEndpointAddress) & 0x0f),
2301                          ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
2302                          endpoint->bInterval);
2303         if ((rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL)) != 0) {
2304                 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2305                         get_usb_rcmsg(rc));
2306                 goto error;
2307         }
2308
2309         /* tell the device that the driver is ready */
2310         if ((rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0)) != 0)
2311                 goto error;
2312
2313         /* tell common part that the device is ready */
2314         if (startmode == SM_LOCKED)
2315                 cs->mstate = MS_LOCKED;
2316
2317         /* save address of controller structure */
2318         usb_set_intfdata(interface, cs);
2319
2320         if (!gigaset_start(cs))
2321                 goto error;
2322
2323         return 0;
2324
2325 allocerr:
2326         dev_err(cs->dev, "could not allocate URBs\n");
2327 error:
2328         freeurbs(cs);
2329         usb_set_intfdata(interface, NULL);
2330         gigaset_freecs(cs);
2331         return -ENODEV;
2332 }
2333
2334 /* gigaset_disconnect
2335  * This function is called when the Gigaset base is unplugged.
2336  */
2337 static void gigaset_disconnect(struct usb_interface *interface)
2338 {
2339         struct cardstate *cs;
2340         struct bas_cardstate *ucs;
2341         int j;
2342
2343         cs = usb_get_intfdata(interface);
2344
2345         ucs = cs->hw.bas;
2346
2347         dev_info(cs->dev, "disconnecting Gigaset base\n");
2348
2349         /* mark base as not ready, all channels disconnected */
2350         ucs->basstate = 0;
2351
2352         /* tell LL all channels are down */
2353         for (j = 0; j < BAS_CHANNELS; ++j)
2354                 gigaset_bchannel_down(cs->bcs + j);
2355
2356         /* stop driver (common part) */
2357         gigaset_stop(cs);
2358
2359         /* stop timers and URBs, free ressources */
2360         del_timer_sync(&ucs->timer_ctrl);
2361         del_timer_sync(&ucs->timer_atrdy);
2362         del_timer_sync(&ucs->timer_cmd_in);
2363         freeurbs(cs);
2364         usb_set_intfdata(interface, NULL);
2365         kfree(ucs->rcvbuf);
2366         ucs->rcvbuf = NULL;
2367         ucs->rcvbuf_size = 0;
2368         usb_put_dev(ucs->udev);
2369         ucs->interface = NULL;
2370         ucs->udev = NULL;
2371         cs->dev = NULL;
2372         gigaset_freecs(cs);
2373 }
2374
2375 /* gigaset_suspend
2376  * This function is called before the USB connection is suspended.
2377  */
2378 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2379 {
2380         struct cardstate *cs = usb_get_intfdata(intf);
2381         struct bas_cardstate *ucs = cs->hw.bas;
2382         int rc;
2383
2384         /* set suspend flag; this stops AT command/response traffic */
2385         if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2386                 gig_dbg(DEBUG_SUSPEND, "already suspended");
2387                 return 0;
2388         }
2389
2390         /* wait a bit for blocking conditions to go away */
2391         rc = wait_event_timeout(ucs->waitqueue,
2392                         !(ucs->basstate &
2393                           (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)),
2394                         BAS_TIMEOUT*HZ/10);
2395         gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2396
2397         /* check for conditions preventing suspend */
2398         if (ucs->basstate & (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)) {
2399                 dev_warn(cs->dev, "cannot suspend:\n");
2400                 if (ucs->basstate & BS_B1OPEN)
2401                         dev_warn(cs->dev, " B channel 1 open\n");
2402                 if (ucs->basstate & BS_B2OPEN)
2403                         dev_warn(cs->dev, " B channel 2 open\n");
2404                 if (ucs->basstate & BS_ATRDPEND)
2405                         dev_warn(cs->dev, " receiving AT reply\n");
2406                 if (ucs->basstate & BS_ATWRPEND)
2407                         dev_warn(cs->dev, " sending AT command\n");
2408                 update_basstate(ucs, 0, BS_SUSPEND);
2409                 return -EBUSY;
2410         }
2411
2412         /* close AT channel if open */
2413         if (ucs->basstate & BS_ATOPEN) {
2414                 gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2415                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2416                 if (rc) {
2417                         update_basstate(ucs, 0, BS_SUSPEND);
2418                         return rc;
2419                 }
2420                 wait_event_timeout(ucs->waitqueue, !ucs->pending,
2421                                    BAS_TIMEOUT*HZ/10);
2422                 /* in case of timeout, proceed anyway */
2423         }
2424
2425         /* kill all URBs and timers that might still be pending */
2426         usb_kill_urb(ucs->urb_ctrl);
2427         usb_kill_urb(ucs->urb_int_in);
2428         del_timer_sync(&ucs->timer_ctrl);
2429
2430         gig_dbg(DEBUG_SUSPEND, "suspend complete");
2431         return 0;
2432 }
2433
2434 /* gigaset_resume
2435  * This function is called after the USB connection has been resumed.
2436  */
2437 static int gigaset_resume(struct usb_interface *intf)
2438 {
2439         struct cardstate *cs = usb_get_intfdata(intf);
2440         struct bas_cardstate *ucs = cs->hw.bas;
2441         int rc;
2442
2443         /* resubmit interrupt URB for spontaneous messages from base */
2444         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2445         if (rc) {
2446                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2447                         get_usb_rcmsg(rc));
2448                 return rc;
2449         }
2450
2451         /* clear suspend flag to reallow activity */
2452         update_basstate(ucs, 0, BS_SUSPEND);
2453
2454         gig_dbg(DEBUG_SUSPEND, "resume complete");
2455         return 0;
2456 }
2457
2458 /* gigaset_pre_reset
2459  * This function is called before the USB connection is reset.
2460  */
2461 static int gigaset_pre_reset(struct usb_interface *intf)
2462 {
2463         /* handle just like suspend */
2464         return gigaset_suspend(intf, PMSG_ON);
2465 }
2466
2467 /* gigaset_post_reset
2468  * This function is called after the USB connection has been reset.
2469  */
2470 static int gigaset_post_reset(struct usb_interface *intf)
2471 {
2472         /* FIXME: send HD_DEVICE_INIT_ACK? */
2473
2474         /* resume operations */
2475         return gigaset_resume(intf);
2476 }
2477
2478
2479 static const struct gigaset_ops gigops = {
2480         gigaset_write_cmd,
2481         gigaset_write_room,
2482         gigaset_chars_in_buffer,
2483         gigaset_brkchars,
2484         gigaset_init_bchannel,
2485         gigaset_close_bchannel,
2486         gigaset_initbcshw,
2487         gigaset_freebcshw,
2488         gigaset_reinitbcshw,
2489         gigaset_initcshw,
2490         gigaset_freecshw,
2491         gigaset_set_modem_ctrl,
2492         gigaset_baud_rate,
2493         gigaset_set_line_ctrl,
2494         gigaset_isoc_send_skb,
2495         gigaset_isoc_input,
2496 };
2497
2498 /* bas_gigaset_init
2499  * This function is called after the kernel module is loaded.
2500  */
2501 static int __init bas_gigaset_init(void)
2502 {
2503         int result;
2504
2505         /* allocate memory for our driver state and intialize it */
2506         if ((driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2507                                        GIGASET_MODULENAME, GIGASET_DEVNAME,
2508                                        &gigops, THIS_MODULE)) == NULL)
2509                 goto error;
2510
2511         /* register this driver with the USB subsystem */
2512         result = usb_register(&gigaset_usb_driver);
2513         if (result < 0) {
2514                 pr_err("error %d registering USB driver\n", -result);
2515                 goto error;
2516         }
2517
2518         pr_info(DRIVER_DESC "\n");
2519         return 0;
2520
2521 error:
2522         if (driver)
2523                 gigaset_freedriver(driver);
2524         driver = NULL;
2525         return -1;
2526 }
2527
2528 /* bas_gigaset_exit
2529  * This function is called before the kernel module is unloaded.
2530  */
2531 static void __exit bas_gigaset_exit(void)
2532 {
2533         struct bas_cardstate *ucs;
2534         int i;
2535
2536         gigaset_blockdriver(driver); /* => probe will fail
2537                                       * => no gigaset_start any more
2538                                       */
2539
2540         /* stop all connected devices */
2541         for (i = 0; i < driver->minors; i++) {
2542                 if (gigaset_shutdown(driver->cs + i) < 0)
2543                         continue;               /* no device */
2544                 /* from now on, no isdn callback should be possible */
2545
2546                 /* close all still open channels */
2547                 ucs = driver->cs[i].hw.bas;
2548                 if (ucs->basstate & BS_B1OPEN) {
2549                         gig_dbg(DEBUG_INIT, "closing B1 channel");
2550                         usb_control_msg(ucs->udev,
2551                                         usb_sndctrlpipe(ucs->udev, 0),
2552                                         HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2553                                         0, 0, NULL, 0, BAS_TIMEOUT);
2554                 }
2555                 if (ucs->basstate & BS_B2OPEN) {
2556                         gig_dbg(DEBUG_INIT, "closing B2 channel");
2557                         usb_control_msg(ucs->udev,
2558                                         usb_sndctrlpipe(ucs->udev, 0),
2559                                         HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2560                                         0, 0, NULL, 0, BAS_TIMEOUT);
2561                 }
2562                 if (ucs->basstate & BS_ATOPEN) {
2563                         gig_dbg(DEBUG_INIT, "closing AT channel");
2564                         usb_control_msg(ucs->udev,
2565                                         usb_sndctrlpipe(ucs->udev, 0),
2566                                         HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2567                                         0, 0, NULL, 0, BAS_TIMEOUT);
2568                 }
2569                 ucs->basstate = 0;
2570         }
2571
2572         /* deregister this driver with the USB subsystem */
2573         usb_deregister(&gigaset_usb_driver);
2574         /* this will call the disconnect-callback */
2575         /* from now on, no disconnect/probe callback should be running */
2576
2577         gigaset_freedriver(driver);
2578         driver = NULL;
2579 }
2580
2581
2582 module_init(bas_gigaset_init);
2583 module_exit(bas_gigaset_exit);
2584
2585 MODULE_AUTHOR(DRIVER_AUTHOR);
2586 MODULE_DESCRIPTION(DRIVER_DESC);
2587 MODULE_LICENSE("GPL");