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[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                         if (unlikely(urb->iso_frame_desc[frame].status)) {
1335                                 dev_warn(cs->dev,
1336                                          "isochronous read: frame %d: %s\n",
1337                                          frame,
1338                                          get_usb_statmsg(
1339                                             urb->iso_frame_desc[frame].status));
1340                                 break;
1341                         }
1342                         numbytes = urb->iso_frame_desc[frame].actual_length;
1343                         if (unlikely(numbytes > BAS_MAXFRAME)) {
1344                                 dev_warn(cs->dev,
1345                                          "isochronous read: frame %d: "
1346                                          "numbytes (%d) > BAS_MAXFRAME\n",
1347                                          frame, numbytes);
1348                                 break;
1349                         }
1350                         if (unlikely(numbytes > totleft)) {
1351                                 dev_warn(cs->dev,
1352                                          "isochronous read: frame %d: "
1353                                          "numbytes (%d) > totleft (%d)\n",
1354                                          frame, numbytes, totleft);
1355                                 break;
1356                         }
1357                         offset = urb->iso_frame_desc[frame].offset;
1358                         if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1359                                 dev_warn(cs->dev,
1360                                          "isochronous read: frame %d: "
1361                                          "offset (%d) + numbytes (%d) "
1362                                          "> BAS_INBUFSIZE\n",
1363                                          frame, offset, numbytes);
1364                                 break;
1365                         }
1366                         gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1367                         totleft -= numbytes;
1368                 }
1369                 if (unlikely(totleft > 0))
1370                         dev_warn(cs->dev,
1371                                  "isochronous read: %d data bytes missing\n",
1372                                  totleft);
1373
1374         error:
1375                 /* URB processed, resubmit */
1376                 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1377                         urb->iso_frame_desc[frame].status = 0;
1378                         urb->iso_frame_desc[frame].actual_length = 0;
1379                 }
1380                 /* urb->dev is clobbered by USB subsystem */
1381                 urb->dev = bcs->cs->hw.bas->udev;
1382                 urb->transfer_flags = URB_ISO_ASAP;
1383                 urb->number_of_packets = BAS_NUMFRAMES;
1384                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1385                 if (unlikely(rc != 0 && rc != -ENODEV)) {
1386                         dev_err(cs->dev,
1387                                 "could not resubmit isochronous read URB: %s\n",
1388                                 get_usb_rcmsg(rc));
1389                         dump_urb(DEBUG_ISO, "resubmit iso read", urb);
1390                         error_hangup(bcs);
1391                 }
1392         }
1393 }
1394
1395 /* Channel Operations */
1396 /* ================== */
1397
1398 /* req_timeout
1399  * timeout routine for control output request
1400  * argument:
1401  *      B channel control structure
1402  */
1403 static void req_timeout(unsigned long data)
1404 {
1405         struct bc_state *bcs = (struct bc_state *) data;
1406         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1407         int pending;
1408         unsigned long flags;
1409
1410         check_pending(ucs);
1411
1412         spin_lock_irqsave(&ucs->lock, flags);
1413         pending = ucs->pending;
1414         ucs->pending = 0;
1415         spin_unlock_irqrestore(&ucs->lock, flags);
1416
1417         switch (pending) {
1418         case 0:                                 /* no pending request */
1419                 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1420                 break;
1421
1422         case HD_OPEN_ATCHANNEL:
1423                 dev_err(bcs->cs->dev, "timeout opening AT channel\n");
1424                 error_reset(bcs->cs);
1425                 break;
1426
1427         case HD_OPEN_B2CHANNEL:
1428         case HD_OPEN_B1CHANNEL:
1429                 dev_err(bcs->cs->dev, "timeout opening channel %d\n",
1430                         bcs->channel + 1);
1431                 error_hangup(bcs);
1432                 break;
1433
1434         case HD_CLOSE_ATCHANNEL:
1435                 dev_err(bcs->cs->dev, "timeout closing AT channel\n");
1436                 break;
1437
1438         case HD_CLOSE_B2CHANNEL:
1439         case HD_CLOSE_B1CHANNEL:
1440                 dev_err(bcs->cs->dev, "timeout closing channel %d\n",
1441                         bcs->channel + 1);
1442                 error_reset(bcs->cs);
1443                 break;
1444
1445         default:
1446                 dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
1447                          pending);
1448         }
1449
1450         wake_up(&ucs->waitqueue);
1451 }
1452
1453 /* write_ctrl_callback
1454  * USB completion handler for control pipe output
1455  * called by the USB subsystem in interrupt context
1456  * parameter:
1457  *      urb     USB request block of completed request
1458  *              urb->context = hardware specific controller state structure
1459  */
1460 static void write_ctrl_callback(struct urb *urb)
1461 {
1462         struct bas_cardstate *ucs = urb->context;
1463         int status = urb->status;
1464         int rc;
1465         unsigned long flags;
1466
1467         /* check status */
1468         switch (status) {
1469         case 0:                                 /* normal completion */
1470                 spin_lock_irqsave(&ucs->lock, flags);
1471                 switch (ucs->pending) {
1472                 case HD_DEVICE_INIT_ACK:        /* no reply expected */
1473                         del_timer(&ucs->timer_ctrl);
1474                         ucs->pending = 0;
1475                         break;
1476                 }
1477                 spin_unlock_irqrestore(&ucs->lock, flags);
1478                 return;
1479
1480         case -ENOENT:                   /* cancelled */
1481         case -ECONNRESET:               /* cancelled (async) */
1482         case -EINPROGRESS:              /* pending */
1483         case -ENODEV:                   /* device removed */
1484         case -ESHUTDOWN:                /* device shut down */
1485                 /* ignore silently */
1486                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1487                         __func__, get_usb_statmsg(status));
1488                 break;
1489
1490         default:                                /* any failure */
1491                 /* don't retry if suspend requested */
1492                 if (++ucs->retry_ctrl > BAS_RETRY ||
1493                     (ucs->basstate & BS_SUSPEND)) {
1494                         dev_err(&ucs->interface->dev,
1495                                 "control request 0x%02x failed: %s\n",
1496                                 ucs->dr_ctrl.bRequest,
1497                                 get_usb_statmsg(status));
1498                         break;          /* give up */
1499                 }
1500                 dev_notice(&ucs->interface->dev,
1501                            "control request 0x%02x: %s, retry %d\n",
1502                            ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1503                            ucs->retry_ctrl);
1504                 /* urb->dev is clobbered by USB subsystem */
1505                 urb->dev = ucs->udev;
1506                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1507                 if (unlikely(rc)) {
1508                         dev_err(&ucs->interface->dev,
1509                                 "could not resubmit request 0x%02x: %s\n",
1510                                 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1511                         break;
1512                 }
1513                 /* resubmitted */
1514                 return;
1515         }
1516
1517         /* failed, clear pending request */
1518         spin_lock_irqsave(&ucs->lock, flags);
1519         del_timer(&ucs->timer_ctrl);
1520         ucs->pending = 0;
1521         spin_unlock_irqrestore(&ucs->lock, flags);
1522         wake_up(&ucs->waitqueue);
1523 }
1524
1525 /* req_submit
1526  * submit a control output request without message buffer to the Gigaset base
1527  * and optionally start a timeout
1528  * parameters:
1529  *      bcs     B channel control structure
1530  *      req     control request code (HD_*)
1531  *      val     control request parameter value (set to 0 if unused)
1532  *      timeout timeout in seconds (0: no timeout)
1533  * return value:
1534  *      0 on success
1535  *      -EBUSY if another request is pending
1536  *      any URB submission error code
1537  */
1538 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1539 {
1540         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1541         int ret;
1542         unsigned long flags;
1543
1544         gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1545
1546         spin_lock_irqsave(&ucs->lock, flags);
1547         if (ucs->pending) {
1548                 spin_unlock_irqrestore(&ucs->lock, flags);
1549                 dev_err(bcs->cs->dev,
1550                         "submission of request 0x%02x failed: "
1551                         "request 0x%02x still pending\n",
1552                         req, ucs->pending);
1553                 return -EBUSY;
1554         }
1555
1556         ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1557         ucs->dr_ctrl.bRequest = req;
1558         ucs->dr_ctrl.wValue = cpu_to_le16(val);
1559         ucs->dr_ctrl.wIndex = 0;
1560         ucs->dr_ctrl.wLength = 0;
1561         usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1562                              usb_sndctrlpipe(ucs->udev, 0),
1563                              (unsigned char*) &ucs->dr_ctrl, NULL, 0,
1564                              write_ctrl_callback, ucs);
1565         ucs->retry_ctrl = 0;
1566         ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1567         if (unlikely(ret)) {
1568                 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1569                         req, get_usb_rcmsg(ret));
1570                 spin_unlock_irqrestore(&ucs->lock, flags);
1571                 return ret;
1572         }
1573         ucs->pending = req;
1574
1575         if (timeout > 0) {
1576                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1577                 ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
1578                 ucs->timer_ctrl.data = (unsigned long) bcs;
1579                 ucs->timer_ctrl.function = req_timeout;
1580                 add_timer(&ucs->timer_ctrl);
1581         }
1582
1583         spin_unlock_irqrestore(&ucs->lock, flags);
1584         return 0;
1585 }
1586
1587 /* gigaset_init_bchannel
1588  * called by common.c to connect a B channel
1589  * initialize isochronous I/O and tell the Gigaset base to open the channel
1590  * argument:
1591  *      B channel control structure
1592  * return value:
1593  *      0 on success, error code < 0 on error
1594  */
1595 static int gigaset_init_bchannel(struct bc_state *bcs)
1596 {
1597         struct cardstate *cs = bcs->cs;
1598         int req, ret;
1599         unsigned long flags;
1600
1601         spin_lock_irqsave(&cs->lock, flags);
1602         if (unlikely(!cs->connected)) {
1603                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1604                 spin_unlock_irqrestore(&cs->lock, flags);
1605                 return -ENODEV;
1606         }
1607
1608         if (cs->hw.bas->basstate & BS_SUSPEND) {
1609                 dev_notice(cs->dev,
1610                            "not starting isochronous I/O, "
1611                            "suspend in progress\n");
1612                 spin_unlock_irqrestore(&cs->lock, flags);
1613                 return -EHOSTUNREACH;
1614         }
1615
1616         if ((ret = starturbs(bcs)) < 0) {
1617                 dev_err(cs->dev,
1618                         "could not start isochronous I/O for channel B%d: %s\n",
1619                         bcs->channel + 1,
1620                         ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1621                 if (ret != -ENODEV)
1622                         error_hangup(bcs);
1623                 spin_unlock_irqrestore(&cs->lock, flags);
1624                 return ret;
1625         }
1626
1627         req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1628         if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0) {
1629                 dev_err(cs->dev, "could not open channel B%d\n",
1630                         bcs->channel + 1);
1631                 stopurbs(bcs->hw.bas);
1632                 if (ret != -ENODEV)
1633                         error_hangup(bcs);
1634         }
1635
1636         spin_unlock_irqrestore(&cs->lock, flags);
1637         return ret;
1638 }
1639
1640 /* gigaset_close_bchannel
1641  * called by common.c to disconnect a B channel
1642  * tell the Gigaset base to close the channel
1643  * stopping isochronous I/O and LL notification will be done when the
1644  * acknowledgement for the close arrives
1645  * argument:
1646  *      B channel control structure
1647  * return value:
1648  *      0 on success, error code < 0 on error
1649  */
1650 static int gigaset_close_bchannel(struct bc_state *bcs)
1651 {
1652         struct cardstate *cs = bcs->cs;
1653         int req, ret;
1654         unsigned long flags;
1655
1656         spin_lock_irqsave(&cs->lock, flags);
1657         if (unlikely(!cs->connected)) {
1658                 spin_unlock_irqrestore(&cs->lock, flags);
1659                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1660                 return -ENODEV;
1661         }
1662
1663         if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1664                 /* channel not running: just signal common.c */
1665                 spin_unlock_irqrestore(&cs->lock, flags);
1666                 gigaset_bchannel_down(bcs);
1667                 return 0;
1668         }
1669
1670         /* channel running: tell device to close it */
1671         req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1672         if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0)
1673                 dev_err(cs->dev, "closing channel B%d failed\n",
1674                         bcs->channel + 1);
1675
1676         spin_unlock_irqrestore(&cs->lock, flags);
1677         return ret;
1678 }
1679
1680 /* Device Operations */
1681 /* ================= */
1682
1683 /* complete_cb
1684  * unqueue first command buffer from queue, waking any sleepers
1685  * must be called with cs->cmdlock held
1686  * parameter:
1687  *      cs      controller state structure
1688  */
1689 static void complete_cb(struct cardstate *cs)
1690 {
1691         struct cmdbuf_t *cb = cs->cmdbuf;
1692
1693         /* unqueue completed buffer */
1694         cs->cmdbytes -= cs->curlen;
1695         gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD,
1696                 "write_command: sent %u bytes, %u left",
1697                 cs->curlen, cs->cmdbytes);
1698         if ((cs->cmdbuf = cb->next) != NULL) {
1699                 cs->cmdbuf->prev = NULL;
1700                 cs->curlen = cs->cmdbuf->len;
1701         } else {
1702                 cs->lastcmdbuf = NULL;
1703                 cs->curlen = 0;
1704         }
1705
1706         if (cb->wake_tasklet)
1707                 tasklet_schedule(cb->wake_tasklet);
1708
1709         kfree(cb);
1710 }
1711
1712 /* write_command_callback
1713  * USB completion handler for AT command transmission
1714  * called by the USB subsystem in interrupt context
1715  * parameter:
1716  *      urb     USB request block of completed request
1717  *              urb->context = controller state structure
1718  */
1719 static void write_command_callback(struct urb *urb)
1720 {
1721         struct cardstate *cs = urb->context;
1722         struct bas_cardstate *ucs = cs->hw.bas;
1723         int status = urb->status;
1724         unsigned long flags;
1725
1726         update_basstate(ucs, 0, BS_ATWRPEND);
1727         wake_up(&ucs->waitqueue);
1728
1729         /* check status */
1730         switch (status) {
1731         case 0:                                 /* normal completion */
1732                 break;
1733         case -ENOENT:                   /* cancelled */
1734         case -ECONNRESET:               /* cancelled (async) */
1735         case -EINPROGRESS:              /* pending */
1736         case -ENODEV:                   /* device removed */
1737         case -ESHUTDOWN:                /* device shut down */
1738                 /* ignore silently */
1739                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1740                         __func__, get_usb_statmsg(status));
1741                 return;
1742         default:                                /* any failure */
1743                 if (++ucs->retry_cmd_out > BAS_RETRY) {
1744                         dev_warn(cs->dev,
1745                                  "command write: %s, "
1746                                  "giving up after %d retries\n",
1747                                  get_usb_statmsg(status),
1748                                  ucs->retry_cmd_out);
1749                         break;
1750                 }
1751                 if (ucs->basstate & BS_SUSPEND) {
1752                         dev_warn(cs->dev,
1753                                  "command write: %s, "
1754                                  "won't retry - suspend requested\n",
1755                                  get_usb_statmsg(status));
1756                         break;
1757                 }
1758                 if (cs->cmdbuf == NULL) {
1759                         dev_warn(cs->dev,
1760                                  "command write: %s, "
1761                                  "cannot retry - cmdbuf gone\n",
1762                                  get_usb_statmsg(status));
1763                         break;
1764                 }
1765                 dev_notice(cs->dev, "command write: %s, retry %d\n",
1766                            get_usb_statmsg(status), ucs->retry_cmd_out);
1767                 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1768                         /* resubmitted - bypass regular exit block */
1769                         return;
1770                 /* command send failed, assume base still waiting */
1771                 update_basstate(ucs, BS_ATREADY, 0);
1772         }
1773
1774         spin_lock_irqsave(&cs->cmdlock, flags);
1775         if (cs->cmdbuf != NULL)
1776                 complete_cb(cs);
1777         spin_unlock_irqrestore(&cs->cmdlock, flags);
1778 }
1779
1780 /* atrdy_timeout
1781  * timeout routine for AT command transmission
1782  * argument:
1783  *      controller state structure
1784  */
1785 static void atrdy_timeout(unsigned long data)
1786 {
1787         struct cardstate *cs = (struct cardstate *) data;
1788         struct bas_cardstate *ucs = cs->hw.bas;
1789
1790         dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1791
1792         /* fake the missing signal - what else can I do? */
1793         update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1794         start_cbsend(cs);
1795 }
1796
1797 /* atwrite_submit
1798  * submit an HD_WRITE_ATMESSAGE command URB
1799  * parameters:
1800  *      cs      controller state structure
1801  *      buf     buffer containing command to send
1802  *      len     length of command to send
1803  * return value:
1804  *      0 on success
1805  *      -EBUSY if another request is pending
1806  *      any URB submission error code
1807  */
1808 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1809 {
1810         struct bas_cardstate *ucs = cs->hw.bas;
1811         int rc;
1812
1813         gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1814
1815         if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1816                 dev_err(cs->dev,
1817                         "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1818                 return -EBUSY;
1819         }
1820
1821         ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1822         ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1823         ucs->dr_cmd_out.wValue = 0;
1824         ucs->dr_cmd_out.wIndex = 0;
1825         ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1826         usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1827                              usb_sndctrlpipe(ucs->udev, 0),
1828                              (unsigned char*) &ucs->dr_cmd_out, buf, len,
1829                              write_command_callback, cs);
1830         rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1831         if (unlikely(rc)) {
1832                 update_basstate(ucs, 0, BS_ATWRPEND);
1833                 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1834                         get_usb_rcmsg(rc));
1835                 return rc;
1836         }
1837
1838         /* submitted successfully, start timeout if necessary */
1839         if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1840                 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1841                         ATRDY_TIMEOUT);
1842                 ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
1843                 ucs->timer_atrdy.data = (unsigned long) cs;
1844                 ucs->timer_atrdy.function = atrdy_timeout;
1845                 add_timer(&ucs->timer_atrdy);
1846         }
1847         return 0;
1848 }
1849
1850 /* start_cbsend
1851  * start transmission of AT command queue if necessary
1852  * parameter:
1853  *      cs              controller state structure
1854  * return value:
1855  *      0 on success
1856  *      error code < 0 on error
1857  */
1858 static int start_cbsend(struct cardstate *cs)
1859 {
1860         struct cmdbuf_t *cb;
1861         struct bas_cardstate *ucs = cs->hw.bas;
1862         unsigned long flags;
1863         int rc;
1864         int retval = 0;
1865
1866         /* check if suspend requested */
1867         if (ucs->basstate & BS_SUSPEND) {
1868                 gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "suspending");
1869                 return -EHOSTUNREACH;
1870         }
1871
1872         /* check if AT channel is open */
1873         if (!(ucs->basstate & BS_ATOPEN)) {
1874                 gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "AT channel not open");
1875                 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1876                 if (rc < 0) {
1877                         /* flush command queue */
1878                         spin_lock_irqsave(&cs->cmdlock, flags);
1879                         while (cs->cmdbuf != NULL)
1880                                 complete_cb(cs);
1881                         spin_unlock_irqrestore(&cs->cmdlock, flags);
1882                 }
1883                 return rc;
1884         }
1885
1886         /* try to send first command in queue */
1887         spin_lock_irqsave(&cs->cmdlock, flags);
1888
1889         while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1890                 ucs->retry_cmd_out = 0;
1891                 rc = atwrite_submit(cs, cb->buf, cb->len);
1892                 if (unlikely(rc)) {
1893                         retval = rc;
1894                         complete_cb(cs);
1895                 }
1896         }
1897
1898         spin_unlock_irqrestore(&cs->cmdlock, flags);
1899         return retval;
1900 }
1901
1902 /* gigaset_write_cmd
1903  * This function is called by the device independent part of the driver
1904  * to transmit an AT command string to the Gigaset device.
1905  * It encapsulates the device specific method for transmission over the
1906  * direct USB connection to the base.
1907  * The command string is added to the queue of commands to send, and
1908  * USB transmission is started if necessary.
1909  * parameters:
1910  *      cs              controller state structure
1911  *      buf             command string to send
1912  *      len             number of bytes to send (max. IF_WRITEBUF)
1913  *      wake_tasklet    tasklet to run when transmission is completed
1914  *                      (NULL if none)
1915  * return value:
1916  *      number of bytes queued on success
1917  *      error code < 0 on error
1918  */
1919 static int gigaset_write_cmd(struct cardstate *cs,
1920                              const unsigned char *buf, int len,
1921                              struct tasklet_struct *wake_tasklet)
1922 {
1923         struct cmdbuf_t *cb;
1924         unsigned long flags;
1925         int rc;
1926
1927         gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1928                              DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1929                            "CMD Transmit", len, buf);
1930
1931         if (len <= 0) {
1932                 /* nothing to do */
1933                 rc = 0;
1934                 goto notqueued;
1935         }
1936
1937         if (len > IF_WRITEBUF)
1938                 len = IF_WRITEBUF;
1939         if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) {
1940                 dev_err(cs->dev, "%s: out of memory\n", __func__);
1941                 rc = -ENOMEM;
1942                 goto notqueued;
1943         }
1944
1945         memcpy(cb->buf, buf, len);
1946         cb->len = len;
1947         cb->offset = 0;
1948         cb->next = NULL;
1949         cb->wake_tasklet = wake_tasklet;
1950
1951         spin_lock_irqsave(&cs->cmdlock, flags);
1952         cb->prev = cs->lastcmdbuf;
1953         if (cs->lastcmdbuf)
1954                 cs->lastcmdbuf->next = cb;
1955         else {
1956                 cs->cmdbuf = cb;
1957                 cs->curlen = len;
1958         }
1959         cs->cmdbytes += len;
1960         cs->lastcmdbuf = cb;
1961         spin_unlock_irqrestore(&cs->cmdlock, flags);
1962
1963         spin_lock_irqsave(&cs->lock, flags);
1964         if (unlikely(!cs->connected)) {
1965                 spin_unlock_irqrestore(&cs->lock, flags);
1966                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1967                 /* flush command queue */
1968                 spin_lock_irqsave(&cs->cmdlock, flags);
1969                 while (cs->cmdbuf != NULL)
1970                         complete_cb(cs);
1971                 spin_unlock_irqrestore(&cs->cmdlock, flags);
1972                 return -ENODEV;
1973         }
1974         rc = start_cbsend(cs);
1975         spin_unlock_irqrestore(&cs->lock, flags);
1976         return rc < 0 ? rc : len;
1977
1978 notqueued:                      /* request handled without queuing */
1979         if (wake_tasklet)
1980                 tasklet_schedule(wake_tasklet);
1981         return rc;
1982 }
1983
1984 /* gigaset_write_room
1985  * tty_driver.write_room interface routine
1986  * return number of characters the driver will accept to be written via
1987  * gigaset_write_cmd
1988  * parameter:
1989  *      controller state structure
1990  * return value:
1991  *      number of characters
1992  */
1993 static int gigaset_write_room(struct cardstate *cs)
1994 {
1995         return IF_WRITEBUF;
1996 }
1997
1998 /* gigaset_chars_in_buffer
1999  * tty_driver.chars_in_buffer interface routine
2000  * return number of characters waiting to be sent
2001  * parameter:
2002  *      controller state structure
2003  * return value:
2004  *      number of characters
2005  */
2006 static int gigaset_chars_in_buffer(struct cardstate *cs)
2007 {
2008         return cs->cmdbytes;
2009 }
2010
2011 /* gigaset_brkchars
2012  * implementation of ioctl(GIGASET_BRKCHARS)
2013  * parameter:
2014  *      controller state structure
2015  * return value:
2016  *      -EINVAL (unimplemented function)
2017  */
2018 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
2019 {
2020         return -EINVAL;
2021 }
2022
2023
2024 /* Device Initialization/Shutdown */
2025 /* ============================== */
2026
2027 /* Free hardware dependent part of the B channel structure
2028  * parameter:
2029  *      bcs     B channel structure
2030  * return value:
2031  *      !=0 on success
2032  */
2033 static int gigaset_freebcshw(struct bc_state *bcs)
2034 {
2035         struct bas_bc_state *ubc = bcs->hw.bas;
2036         int i;
2037
2038         if (!ubc)
2039                 return 0;
2040
2041         /* kill URBs and tasklets before freeing - better safe than sorry */
2042         ubc->running = 0;
2043         gig_dbg(DEBUG_INIT, "%s: killing iso URBs", __func__);
2044         for (i = 0; i < BAS_OUTURBS; ++i) {
2045                 usb_kill_urb(ubc->isoouturbs[i].urb);
2046                 usb_free_urb(ubc->isoouturbs[i].urb);
2047         }
2048         for (i = 0; i < BAS_INURBS; ++i) {
2049                 usb_kill_urb(ubc->isoinurbs[i]);
2050                 usb_free_urb(ubc->isoinurbs[i]);
2051         }
2052         tasklet_kill(&ubc->sent_tasklet);
2053         tasklet_kill(&ubc->rcvd_tasklet);
2054         kfree(ubc->isooutbuf);
2055         kfree(ubc);
2056         bcs->hw.bas = NULL;
2057         return 1;
2058 }
2059
2060 /* Initialize hardware dependent part of the B channel structure
2061  * parameter:
2062  *      bcs     B channel structure
2063  * return value:
2064  *      !=0 on success
2065  */
2066 static int gigaset_initbcshw(struct bc_state *bcs)
2067 {
2068         int i;
2069         struct bas_bc_state *ubc;
2070
2071         bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2072         if (!ubc) {
2073                 pr_err("out of memory\n");
2074                 return 0;
2075         }
2076
2077         ubc->running = 0;
2078         atomic_set(&ubc->corrbytes, 0);
2079         spin_lock_init(&ubc->isooutlock);
2080         for (i = 0; i < BAS_OUTURBS; ++i) {
2081                 ubc->isoouturbs[i].urb = NULL;
2082                 ubc->isoouturbs[i].bcs = bcs;
2083         }
2084         ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2085         ubc->numsub = 0;
2086         if (!(ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL))) {
2087                 pr_err("out of memory\n");
2088                 kfree(ubc);
2089                 bcs->hw.bas = NULL;
2090                 return 0;
2091         }
2092         tasklet_init(&ubc->sent_tasklet,
2093                      &write_iso_tasklet, (unsigned long) bcs);
2094
2095         spin_lock_init(&ubc->isoinlock);
2096         for (i = 0; i < BAS_INURBS; ++i)
2097                 ubc->isoinurbs[i] = NULL;
2098         ubc->isoindone = NULL;
2099         ubc->loststatus = -EINPROGRESS;
2100         ubc->isoinlost = 0;
2101         ubc->seqlen = 0;
2102         ubc->inbyte = 0;
2103         ubc->inbits = 0;
2104         ubc->goodbytes = 0;
2105         ubc->alignerrs = 0;
2106         ubc->fcserrs = 0;
2107         ubc->frameerrs = 0;
2108         ubc->giants = 0;
2109         ubc->runts = 0;
2110         ubc->aborts = 0;
2111         ubc->shared0s = 0;
2112         ubc->stolen0s = 0;
2113         tasklet_init(&ubc->rcvd_tasklet,
2114                      &read_iso_tasklet, (unsigned long) bcs);
2115         return 1;
2116 }
2117
2118 static void gigaset_reinitbcshw(struct bc_state *bcs)
2119 {
2120         struct bas_bc_state *ubc = bcs->hw.bas;
2121
2122         bcs->hw.bas->running = 0;
2123         atomic_set(&bcs->hw.bas->corrbytes, 0);
2124         bcs->hw.bas->numsub = 0;
2125         spin_lock_init(&ubc->isooutlock);
2126         spin_lock_init(&ubc->isoinlock);
2127         ubc->loststatus = -EINPROGRESS;
2128 }
2129
2130 static void gigaset_freecshw(struct cardstate *cs)
2131 {
2132         /* timers, URBs and rcvbuf are disposed of in disconnect */
2133         kfree(cs->hw.bas->int_in_buf);
2134         kfree(cs->hw.bas);
2135         cs->hw.bas = NULL;
2136 }
2137
2138 static int gigaset_initcshw(struct cardstate *cs)
2139 {
2140         struct bas_cardstate *ucs;
2141
2142         cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2143         if (!ucs) {
2144                 pr_err("out of memory\n");
2145                 return 0;
2146         }
2147         ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
2148         if (!ucs->int_in_buf) {
2149                 kfree(ucs);
2150                 pr_err("out of memory\n");
2151                 return 0;
2152         }
2153
2154         ucs->urb_cmd_in = NULL;
2155         ucs->urb_cmd_out = NULL;
2156         ucs->rcvbuf = NULL;
2157         ucs->rcvbuf_size = 0;
2158
2159         spin_lock_init(&ucs->lock);
2160         ucs->pending = 0;
2161
2162         ucs->basstate = 0;
2163         init_timer(&ucs->timer_ctrl);
2164         init_timer(&ucs->timer_atrdy);
2165         init_timer(&ucs->timer_cmd_in);
2166         init_waitqueue_head(&ucs->waitqueue);
2167
2168         return 1;
2169 }
2170
2171 /* freeurbs
2172  * unlink and deallocate all URBs unconditionally
2173  * caller must make sure that no commands are still in progress
2174  * parameter:
2175  *      cs      controller state structure
2176  */
2177 static void freeurbs(struct cardstate *cs)
2178 {
2179         struct bas_cardstate *ucs = cs->hw.bas;
2180         struct bas_bc_state *ubc;
2181         int i, j;
2182
2183         gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2184         for (j = 0; j < BAS_CHANNELS; ++j) {
2185                 ubc = cs->bcs[j].hw.bas;
2186                 for (i = 0; i < BAS_OUTURBS; ++i) {
2187                         usb_kill_urb(ubc->isoouturbs[i].urb);
2188                         usb_free_urb(ubc->isoouturbs[i].urb);
2189                         ubc->isoouturbs[i].urb = NULL;
2190                 }
2191                 for (i = 0; i < BAS_INURBS; ++i) {
2192                         usb_kill_urb(ubc->isoinurbs[i]);
2193                         usb_free_urb(ubc->isoinurbs[i]);
2194                         ubc->isoinurbs[i] = NULL;
2195                 }
2196         }
2197         usb_kill_urb(ucs->urb_int_in);
2198         usb_free_urb(ucs->urb_int_in);
2199         ucs->urb_int_in = NULL;
2200         usb_kill_urb(ucs->urb_cmd_out);
2201         usb_free_urb(ucs->urb_cmd_out);
2202         ucs->urb_cmd_out = NULL;
2203         usb_kill_urb(ucs->urb_cmd_in);
2204         usb_free_urb(ucs->urb_cmd_in);
2205         ucs->urb_cmd_in = NULL;
2206         usb_kill_urb(ucs->urb_ctrl);
2207         usb_free_urb(ucs->urb_ctrl);
2208         ucs->urb_ctrl = NULL;
2209 }
2210
2211 /* gigaset_probe
2212  * This function is called when a new USB device is connected.
2213  * It checks whether the new device is handled by this driver.
2214  */
2215 static int gigaset_probe(struct usb_interface *interface,
2216                          const struct usb_device_id *id)
2217 {
2218         struct usb_host_interface *hostif;
2219         struct usb_device *udev = interface_to_usbdev(interface);
2220         struct cardstate *cs = NULL;
2221         struct bas_cardstate *ucs = NULL;
2222         struct bas_bc_state *ubc;
2223         struct usb_endpoint_descriptor *endpoint;
2224         int i, j;
2225         int rc;
2226
2227         gig_dbg(DEBUG_ANY,
2228                 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2229                 __func__, le16_to_cpu(udev->descriptor.idVendor),
2230                 le16_to_cpu(udev->descriptor.idProduct));
2231
2232         /* set required alternate setting */
2233         hostif = interface->cur_altsetting;
2234         if (hostif->desc.bAlternateSetting != 3) {
2235                 gig_dbg(DEBUG_ANY,
2236                         "%s: wrong alternate setting %d - trying to switch",
2237                         __func__, hostif->desc.bAlternateSetting);
2238                 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3) < 0) {
2239                         dev_warn(&udev->dev, "usb_set_interface failed, "
2240                                  "device %d interface %d altsetting %d\n",
2241                                  udev->devnum, hostif->desc.bInterfaceNumber,
2242                                  hostif->desc.bAlternateSetting);
2243                         return -ENODEV;
2244                 }
2245                 hostif = interface->cur_altsetting;
2246         }
2247
2248         /* Reject application specific interfaces
2249          */
2250         if (hostif->desc.bInterfaceClass != 255) {
2251                 dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2252                          __func__, hostif->desc.bInterfaceClass);
2253                 return -ENODEV;
2254         }
2255
2256         dev_info(&udev->dev,
2257                  "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2258                  __func__, le16_to_cpu(udev->descriptor.idVendor),
2259                  le16_to_cpu(udev->descriptor.idProduct));
2260
2261         /* allocate memory for our device state and intialize it */
2262         cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
2263                             GIGASET_MODULENAME);
2264         if (!cs)
2265                 return -ENODEV;
2266         ucs = cs->hw.bas;
2267
2268         /* save off device structure ptrs for later use */
2269         usb_get_dev(udev);
2270         ucs->udev = udev;
2271         ucs->interface = interface;
2272         cs->dev = &interface->dev;
2273
2274         /* allocate URBs:
2275          * - one for the interrupt pipe
2276          * - three for the different uses of the default control pipe
2277          * - three for each isochronous pipe
2278          */
2279         if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2280             !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2281             !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
2282             !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2283                 goto allocerr;
2284
2285         for (j = 0; j < BAS_CHANNELS; ++j) {
2286                 ubc = cs->bcs[j].hw.bas;
2287                 for (i = 0; i < BAS_OUTURBS; ++i)
2288                         if (!(ubc->isoouturbs[i].urb =
2289                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2290                                 goto allocerr;
2291                 for (i = 0; i < BAS_INURBS; ++i)
2292                         if (!(ubc->isoinurbs[i] =
2293                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2294                                 goto allocerr;
2295         }
2296
2297         ucs->rcvbuf = NULL;
2298         ucs->rcvbuf_size = 0;
2299
2300         /* Fill the interrupt urb and send it to the core */
2301         endpoint = &hostif->endpoint[0].desc;
2302         usb_fill_int_urb(ucs->urb_int_in, udev,
2303                          usb_rcvintpipe(udev,
2304                                         (endpoint->bEndpointAddress) & 0x0f),
2305                          ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
2306                          endpoint->bInterval);
2307         if ((rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL)) != 0) {
2308                 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2309                         get_usb_rcmsg(rc));
2310                 goto error;
2311         }
2312
2313         /* tell the device that the driver is ready */
2314         if ((rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0)) != 0)
2315                 goto error;
2316
2317         /* tell common part that the device is ready */
2318         if (startmode == SM_LOCKED)
2319                 cs->mstate = MS_LOCKED;
2320
2321         /* save address of controller structure */
2322         usb_set_intfdata(interface, cs);
2323
2324         if (!gigaset_start(cs))
2325                 goto error;
2326
2327         return 0;
2328
2329 allocerr:
2330         dev_err(cs->dev, "could not allocate URBs\n");
2331 error:
2332         freeurbs(cs);
2333         usb_set_intfdata(interface, NULL);
2334         gigaset_freecs(cs);
2335         return -ENODEV;
2336 }
2337
2338 /* gigaset_disconnect
2339  * This function is called when the Gigaset base is unplugged.
2340  */
2341 static void gigaset_disconnect(struct usb_interface *interface)
2342 {
2343         struct cardstate *cs;
2344         struct bas_cardstate *ucs;
2345         int j;
2346
2347         cs = usb_get_intfdata(interface);
2348
2349         ucs = cs->hw.bas;
2350
2351         dev_info(cs->dev, "disconnecting Gigaset base\n");
2352
2353         /* mark base as not ready, all channels disconnected */
2354         ucs->basstate = 0;
2355
2356         /* tell LL all channels are down */
2357         for (j = 0; j < BAS_CHANNELS; ++j)
2358                 gigaset_bchannel_down(cs->bcs + j);
2359
2360         /* stop driver (common part) */
2361         gigaset_stop(cs);
2362
2363         /* stop timers and URBs, free ressources */
2364         del_timer_sync(&ucs->timer_ctrl);
2365         del_timer_sync(&ucs->timer_atrdy);
2366         del_timer_sync(&ucs->timer_cmd_in);
2367         freeurbs(cs);
2368         usb_set_intfdata(interface, NULL);
2369         kfree(ucs->rcvbuf);
2370         ucs->rcvbuf = NULL;
2371         ucs->rcvbuf_size = 0;
2372         usb_put_dev(ucs->udev);
2373         ucs->interface = NULL;
2374         ucs->udev = NULL;
2375         cs->dev = NULL;
2376         gigaset_freecs(cs);
2377 }
2378
2379 /* gigaset_suspend
2380  * This function is called before the USB connection is suspended.
2381  */
2382 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2383 {
2384         struct cardstate *cs = usb_get_intfdata(intf);
2385         struct bas_cardstate *ucs = cs->hw.bas;
2386         int rc;
2387
2388         /* set suspend flag; this stops AT command/response traffic */
2389         if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2390                 gig_dbg(DEBUG_SUSPEND, "already suspended");
2391                 return 0;
2392         }
2393
2394         /* wait a bit for blocking conditions to go away */
2395         rc = wait_event_timeout(ucs->waitqueue,
2396                         !(ucs->basstate &
2397                           (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)),
2398                         BAS_TIMEOUT*HZ/10);
2399         gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2400
2401         /* check for conditions preventing suspend */
2402         if (ucs->basstate & (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)) {
2403                 dev_warn(cs->dev, "cannot suspend:\n");
2404                 if (ucs->basstate & BS_B1OPEN)
2405                         dev_warn(cs->dev, " B channel 1 open\n");
2406                 if (ucs->basstate & BS_B2OPEN)
2407                         dev_warn(cs->dev, " B channel 2 open\n");
2408                 if (ucs->basstate & BS_ATRDPEND)
2409                         dev_warn(cs->dev, " receiving AT reply\n");
2410                 if (ucs->basstate & BS_ATWRPEND)
2411                         dev_warn(cs->dev, " sending AT command\n");
2412                 update_basstate(ucs, 0, BS_SUSPEND);
2413                 return -EBUSY;
2414         }
2415
2416         /* close AT channel if open */
2417         if (ucs->basstate & BS_ATOPEN) {
2418                 gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2419                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2420                 if (rc) {
2421                         update_basstate(ucs, 0, BS_SUSPEND);
2422                         return rc;
2423                 }
2424                 wait_event_timeout(ucs->waitqueue, !ucs->pending,
2425                                    BAS_TIMEOUT*HZ/10);
2426                 /* in case of timeout, proceed anyway */
2427         }
2428
2429         /* kill all URBs and timers that might still be pending */
2430         usb_kill_urb(ucs->urb_ctrl);
2431         usb_kill_urb(ucs->urb_int_in);
2432         del_timer_sync(&ucs->timer_ctrl);
2433
2434         gig_dbg(DEBUG_SUSPEND, "suspend complete");
2435         return 0;
2436 }
2437
2438 /* gigaset_resume
2439  * This function is called after the USB connection has been resumed.
2440  */
2441 static int gigaset_resume(struct usb_interface *intf)
2442 {
2443         struct cardstate *cs = usb_get_intfdata(intf);
2444         struct bas_cardstate *ucs = cs->hw.bas;
2445         int rc;
2446
2447         /* resubmit interrupt URB for spontaneous messages from base */
2448         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2449         if (rc) {
2450                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2451                         get_usb_rcmsg(rc));
2452                 return rc;
2453         }
2454
2455         /* clear suspend flag to reallow activity */
2456         update_basstate(ucs, 0, BS_SUSPEND);
2457
2458         gig_dbg(DEBUG_SUSPEND, "resume complete");
2459         return 0;
2460 }
2461
2462 /* gigaset_pre_reset
2463  * This function is called before the USB connection is reset.
2464  */
2465 static int gigaset_pre_reset(struct usb_interface *intf)
2466 {
2467         /* handle just like suspend */
2468         return gigaset_suspend(intf, PMSG_ON);
2469 }
2470
2471 /* gigaset_post_reset
2472  * This function is called after the USB connection has been reset.
2473  */
2474 static int gigaset_post_reset(struct usb_interface *intf)
2475 {
2476         /* FIXME: send HD_DEVICE_INIT_ACK? */
2477
2478         /* resume operations */
2479         return gigaset_resume(intf);
2480 }
2481
2482
2483 static const struct gigaset_ops gigops = {
2484         gigaset_write_cmd,
2485         gigaset_write_room,
2486         gigaset_chars_in_buffer,
2487         gigaset_brkchars,
2488         gigaset_init_bchannel,
2489         gigaset_close_bchannel,
2490         gigaset_initbcshw,
2491         gigaset_freebcshw,
2492         gigaset_reinitbcshw,
2493         gigaset_initcshw,
2494         gigaset_freecshw,
2495         gigaset_set_modem_ctrl,
2496         gigaset_baud_rate,
2497         gigaset_set_line_ctrl,
2498         gigaset_isoc_send_skb,
2499         gigaset_isoc_input,
2500 };
2501
2502 /* bas_gigaset_init
2503  * This function is called after the kernel module is loaded.
2504  */
2505 static int __init bas_gigaset_init(void)
2506 {
2507         int result;
2508
2509         /* allocate memory for our driver state and intialize it */
2510         if ((driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2511                                        GIGASET_MODULENAME, GIGASET_DEVNAME,
2512                                        &gigops, THIS_MODULE)) == NULL)
2513                 goto error;
2514
2515         /* register this driver with the USB subsystem */
2516         result = usb_register(&gigaset_usb_driver);
2517         if (result < 0) {
2518                 pr_err("error %d registering USB driver\n", -result);
2519                 goto error;
2520         }
2521
2522         pr_info(DRIVER_DESC "\n");
2523         return 0;
2524
2525 error:
2526         if (driver)
2527                 gigaset_freedriver(driver);
2528         driver = NULL;
2529         return -1;
2530 }
2531
2532 /* bas_gigaset_exit
2533  * This function is called before the kernel module is unloaded.
2534  */
2535 static void __exit bas_gigaset_exit(void)
2536 {
2537         struct bas_cardstate *ucs;
2538         int i;
2539
2540         gigaset_blockdriver(driver); /* => probe will fail
2541                                       * => no gigaset_start any more
2542                                       */
2543
2544         /* stop all connected devices */
2545         for (i = 0; i < driver->minors; i++) {
2546                 if (gigaset_shutdown(driver->cs + i) < 0)
2547                         continue;               /* no device */
2548                 /* from now on, no isdn callback should be possible */
2549
2550                 /* close all still open channels */
2551                 ucs = driver->cs[i].hw.bas;
2552                 if (ucs->basstate & BS_B1OPEN) {
2553                         gig_dbg(DEBUG_INIT, "closing B1 channel");
2554                         usb_control_msg(ucs->udev,
2555                                         usb_sndctrlpipe(ucs->udev, 0),
2556                                         HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2557                                         0, 0, NULL, 0, BAS_TIMEOUT);
2558                 }
2559                 if (ucs->basstate & BS_B2OPEN) {
2560                         gig_dbg(DEBUG_INIT, "closing B2 channel");
2561                         usb_control_msg(ucs->udev,
2562                                         usb_sndctrlpipe(ucs->udev, 0),
2563                                         HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2564                                         0, 0, NULL, 0, BAS_TIMEOUT);
2565                 }
2566                 if (ucs->basstate & BS_ATOPEN) {
2567                         gig_dbg(DEBUG_INIT, "closing AT channel");
2568                         usb_control_msg(ucs->udev,
2569                                         usb_sndctrlpipe(ucs->udev, 0),
2570                                         HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2571                                         0, 0, NULL, 0, BAS_TIMEOUT);
2572                 }
2573                 ucs->basstate = 0;
2574         }
2575
2576         /* deregister this driver with the USB subsystem */
2577         usb_deregister(&gigaset_usb_driver);
2578         /* this will call the disconnect-callback */
2579         /* from now on, no disconnect/probe callback should be running */
2580
2581         gigaset_freedriver(driver);
2582         driver = NULL;
2583 }
2584
2585
2586 module_init(bas_gigaset_init);
2587 module_exit(bas_gigaset_exit);
2588
2589 MODULE_AUTHOR(DRIVER_AUTHOR);
2590 MODULE_DESCRIPTION(DRIVER_DESC);
2591 MODULE_LICENSE("GPL");