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2869b23e TS |
1 | /* This is the serial hardware link layer (HLL) for the Gigaset 307x isdn |
2 | * DECT base (aka Sinus 45 isdn) using the RS232 DECT data module M101, | |
3 | * written as a line discipline. | |
4 | * | |
5 | * ===================================================================== | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation; either version 2 of | |
9 | * the License, or (at your option) any later version. | |
10 | * ===================================================================== | |
11 | */ | |
12 | ||
13 | #include "gigaset.h" | |
2869b23e TS |
14 | #include <linux/module.h> |
15 | #include <linux/moduleparam.h> | |
16 | #include <linux/platform_device.h> | |
ee51ef0e | 17 | #include <linux/completion.h> |
2869b23e TS |
18 | |
19 | /* Version Information */ | |
20 | #define DRIVER_AUTHOR "Tilman Schmidt" | |
21 | #define DRIVER_DESC "Serial Driver for Gigaset 307x using Siemens M101" | |
22 | ||
23 | #define GIGASET_MINORS 1 | |
24 | #define GIGASET_MINOR 0 | |
25 | #define GIGASET_MODULENAME "ser_gigaset" | |
26 | #define GIGASET_DEVNAME "ttyGS" | |
27 | ||
28 | /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */ | |
29 | #define IF_WRITEBUF 264 | |
30 | ||
31 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
32 | MODULE_DESCRIPTION(DRIVER_DESC); | |
33 | MODULE_LICENSE("GPL"); | |
34 | MODULE_ALIAS_LDISC(N_GIGASET_M101); | |
35 | ||
36 | static int startmode = SM_ISDN; | |
37 | module_param(startmode, int, S_IRUGO); | |
38 | MODULE_PARM_DESC(startmode, "initial operation mode"); | |
39 | static int cidmode = 1; | |
40 | module_param(cidmode, int, S_IRUGO); | |
41 | MODULE_PARM_DESC(cidmode, "stay in CID mode when idle"); | |
42 | ||
43 | static struct gigaset_driver *driver; | |
44 | ||
45 | struct ser_cardstate { | |
46 | struct platform_device dev; | |
47 | struct tty_struct *tty; | |
48 | atomic_t refcnt; | |
ee51ef0e | 49 | struct completion dead_cmp; |
2869b23e TS |
50 | }; |
51 | ||
52 | static struct platform_driver device_driver = { | |
53 | .driver = { | |
54 | .name = GIGASET_MODULENAME, | |
55 | }, | |
56 | }; | |
57 | ||
58 | static void flush_send_queue(struct cardstate *); | |
59 | ||
60 | /* transmit data from current open skb | |
61 | * result: number of bytes sent or error code < 0 | |
62 | */ | |
63 | static int write_modem(struct cardstate *cs) | |
64 | { | |
65 | struct tty_struct *tty = cs->hw.ser->tty; | |
66 | struct bc_state *bcs = &cs->bcs[0]; /* only one channel */ | |
67 | struct sk_buff *skb = bcs->tx_skb; | |
f34d7a5b | 68 | int sent = -EOPNOTSUPP; |
2869b23e TS |
69 | |
70 | if (!tty || !tty->driver || !skb) | |
f34d7a5b | 71 | return -EINVAL; |
2869b23e TS |
72 | |
73 | if (!skb->len) { | |
74 | dev_kfree_skb_any(skb); | |
75 | bcs->tx_skb = NULL; | |
76 | return -EINVAL; | |
77 | } | |
78 | ||
79 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
f34d7a5b AC |
80 | if (tty->ops->write) |
81 | sent = tty->ops->write(tty, skb->data, skb->len); | |
2869b23e TS |
82 | gig_dbg(DEBUG_OUTPUT, "write_modem: sent %d", sent); |
83 | if (sent < 0) { | |
84 | /* error */ | |
85 | flush_send_queue(cs); | |
86 | return sent; | |
87 | } | |
88 | skb_pull(skb, sent); | |
89 | if (!skb->len) { | |
90 | /* skb sent completely */ | |
91 | gigaset_skb_sent(bcs, skb); | |
92 | ||
93 | gig_dbg(DEBUG_INTR, "kfree skb (Adr: %lx)!", | |
94 | (unsigned long) skb); | |
95 | dev_kfree_skb_any(skb); | |
96 | bcs->tx_skb = NULL; | |
97 | } | |
98 | return sent; | |
99 | } | |
100 | ||
101 | /* | |
102 | * transmit first queued command buffer | |
103 | * result: number of bytes sent or error code < 0 | |
104 | */ | |
105 | static int send_cb(struct cardstate *cs) | |
106 | { | |
107 | struct tty_struct *tty = cs->hw.ser->tty; | |
108 | struct cmdbuf_t *cb, *tcb; | |
109 | unsigned long flags; | |
110 | int sent = 0; | |
111 | ||
112 | if (!tty || !tty->driver) | |
113 | return -EFAULT; | |
114 | ||
115 | cb = cs->cmdbuf; | |
116 | if (!cb) | |
117 | return 0; /* nothing to do */ | |
118 | ||
119 | if (cb->len) { | |
120 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
f34d7a5b | 121 | sent = tty->ops->write(tty, cb->buf + cb->offset, cb->len); |
2869b23e TS |
122 | if (sent < 0) { |
123 | /* error */ | |
124 | gig_dbg(DEBUG_OUTPUT, "send_cb: write error %d", sent); | |
125 | flush_send_queue(cs); | |
126 | return sent; | |
127 | } | |
128 | cb->offset += sent; | |
129 | cb->len -= sent; | |
130 | gig_dbg(DEBUG_OUTPUT, "send_cb: sent %d, left %u, queued %u", | |
131 | sent, cb->len, cs->cmdbytes); | |
132 | } | |
133 | ||
134 | while (cb && !cb->len) { | |
135 | spin_lock_irqsave(&cs->cmdlock, flags); | |
136 | cs->cmdbytes -= cs->curlen; | |
137 | tcb = cb; | |
138 | cs->cmdbuf = cb = cb->next; | |
139 | if (cb) { | |
140 | cb->prev = NULL; | |
141 | cs->curlen = cb->len; | |
142 | } else { | |
143 | cs->lastcmdbuf = NULL; | |
144 | cs->curlen = 0; | |
145 | } | |
146 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
147 | ||
148 | if (tcb->wake_tasklet) | |
149 | tasklet_schedule(tcb->wake_tasklet); | |
150 | kfree(tcb); | |
151 | } | |
152 | return sent; | |
153 | } | |
154 | ||
155 | /* | |
156 | * send queue tasklet | |
157 | * If there is already a skb opened, put data to the transfer buffer | |
158 | * by calling "write_modem". | |
159 | * Otherwise take a new skb out of the queue. | |
160 | */ | |
161 | static void gigaset_modem_fill(unsigned long data) | |
162 | { | |
163 | struct cardstate *cs = (struct cardstate *) data; | |
164 | struct bc_state *bcs; | |
ae67d7d8 | 165 | struct sk_buff *nextskb; |
2869b23e TS |
166 | int sent = 0; |
167 | ||
ae67d7d8 TS |
168 | if (!cs) { |
169 | gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__); | |
170 | return; | |
171 | } | |
172 | bcs = cs->bcs; | |
173 | if (!bcs) { | |
2869b23e TS |
174 | gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__); |
175 | return; | |
176 | } | |
177 | if (!bcs->tx_skb) { | |
178 | /* no skb is being sent; send command if any */ | |
179 | sent = send_cb(cs); | |
180 | gig_dbg(DEBUG_OUTPUT, "%s: send_cb -> %d", __func__, sent); | |
181 | if (sent) | |
182 | /* something sent or error */ | |
183 | return; | |
184 | ||
185 | /* no command to send; get skb */ | |
ae67d7d8 TS |
186 | nextskb = skb_dequeue(&bcs->squeue); |
187 | if (!nextskb) | |
2869b23e TS |
188 | /* no skb either, nothing to do */ |
189 | return; | |
ae67d7d8 | 190 | bcs->tx_skb = nextskb; |
2869b23e TS |
191 | |
192 | gig_dbg(DEBUG_INTR, "Dequeued skb (Adr: %lx)", | |
193 | (unsigned long) bcs->tx_skb); | |
194 | } | |
195 | ||
196 | /* send skb */ | |
197 | gig_dbg(DEBUG_OUTPUT, "%s: tx_skb", __func__); | |
198 | if (write_modem(cs) < 0) | |
199 | gig_dbg(DEBUG_OUTPUT, "%s: write_modem failed", __func__); | |
200 | } | |
201 | ||
202 | /* | |
203 | * throw away all data queued for sending | |
204 | */ | |
205 | static void flush_send_queue(struct cardstate *cs) | |
206 | { | |
207 | struct sk_buff *skb; | |
208 | struct cmdbuf_t *cb; | |
209 | unsigned long flags; | |
210 | ||
211 | /* command queue */ | |
212 | spin_lock_irqsave(&cs->cmdlock, flags); | |
213 | while ((cb = cs->cmdbuf) != NULL) { | |
214 | cs->cmdbuf = cb->next; | |
215 | if (cb->wake_tasklet) | |
216 | tasklet_schedule(cb->wake_tasklet); | |
217 | kfree(cb); | |
218 | } | |
219 | cs->cmdbuf = cs->lastcmdbuf = NULL; | |
220 | cs->cmdbytes = cs->curlen = 0; | |
221 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
222 | ||
223 | /* data queue */ | |
224 | if (cs->bcs->tx_skb) | |
225 | dev_kfree_skb_any(cs->bcs->tx_skb); | |
226 | while ((skb = skb_dequeue(&cs->bcs->squeue)) != NULL) | |
227 | dev_kfree_skb_any(skb); | |
228 | } | |
229 | ||
230 | ||
231 | /* Gigaset Driver Interface */ | |
232 | /* ======================== */ | |
233 | ||
234 | /* | |
235 | * queue an AT command string for transmission to the Gigaset device | |
236 | * parameters: | |
237 | * cs controller state structure | |
238 | * buf buffer containing the string to send | |
239 | * len number of characters to send | |
240 | * wake_tasklet tasklet to run when transmission is complete, or NULL | |
241 | * return value: | |
242 | * number of bytes queued, or error code < 0 | |
243 | */ | |
e3628dd1 | 244 | static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb) |
2869b23e | 245 | { |
2869b23e TS |
246 | unsigned long flags; |
247 | ||
9d4bee2b | 248 | gigaset_dbg_buffer(cs->mstate != MS_LOCKED ? |
ae67d7d8 | 249 | DEBUG_TRANSCMD : DEBUG_LOCKCMD, |
e3628dd1 | 250 | "CMD Transmit", cb->len, cb->buf); |
2869b23e TS |
251 | |
252 | spin_lock_irqsave(&cs->cmdlock, flags); | |
253 | cb->prev = cs->lastcmdbuf; | |
254 | if (cs->lastcmdbuf) | |
255 | cs->lastcmdbuf->next = cb; | |
256 | else { | |
257 | cs->cmdbuf = cb; | |
e3628dd1 | 258 | cs->curlen = cb->len; |
2869b23e | 259 | } |
e3628dd1 | 260 | cs->cmdbytes += cb->len; |
2869b23e TS |
261 | cs->lastcmdbuf = cb; |
262 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
263 | ||
264 | spin_lock_irqsave(&cs->lock, flags); | |
265 | if (cs->connected) | |
266 | tasklet_schedule(&cs->write_tasklet); | |
267 | spin_unlock_irqrestore(&cs->lock, flags); | |
e3628dd1 | 268 | return cb->len; |
2869b23e TS |
269 | } |
270 | ||
271 | /* | |
272 | * tty_driver.write_room interface routine | |
273 | * return number of characters the driver will accept to be written | |
274 | * parameter: | |
275 | * controller state structure | |
276 | * return value: | |
277 | * number of characters | |
278 | */ | |
279 | static int gigaset_write_room(struct cardstate *cs) | |
280 | { | |
281 | unsigned bytes; | |
282 | ||
283 | bytes = cs->cmdbytes; | |
284 | return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0; | |
285 | } | |
286 | ||
287 | /* | |
288 | * tty_driver.chars_in_buffer interface routine | |
289 | * return number of characters waiting to be sent | |
290 | * parameter: | |
291 | * controller state structure | |
292 | * return value: | |
293 | * number of characters | |
294 | */ | |
295 | static int gigaset_chars_in_buffer(struct cardstate *cs) | |
296 | { | |
297 | return cs->cmdbytes; | |
298 | } | |
299 | ||
300 | /* | |
301 | * implementation of ioctl(GIGASET_BRKCHARS) | |
302 | * parameter: | |
303 | * controller state structure | |
304 | * return value: | |
305 | * -EINVAL (unimplemented function) | |
306 | */ | |
307 | static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6]) | |
308 | { | |
309 | /* not implemented */ | |
310 | return -EINVAL; | |
311 | } | |
312 | ||
313 | /* | |
314 | * Open B channel | |
315 | * Called by "do_action" in ev-layer.c | |
316 | */ | |
317 | static int gigaset_init_bchannel(struct bc_state *bcs) | |
318 | { | |
319 | /* nothing to do for M10x */ | |
320 | gigaset_bchannel_up(bcs); | |
321 | return 0; | |
322 | } | |
323 | ||
324 | /* | |
325 | * Close B channel | |
326 | * Called by "do_action" in ev-layer.c | |
327 | */ | |
328 | static int gigaset_close_bchannel(struct bc_state *bcs) | |
329 | { | |
330 | /* nothing to do for M10x */ | |
331 | gigaset_bchannel_down(bcs); | |
332 | return 0; | |
333 | } | |
334 | ||
335 | /* | |
336 | * Set up B channel structure | |
337 | * This is called by "gigaset_initcs" in common.c | |
338 | */ | |
339 | static int gigaset_initbcshw(struct bc_state *bcs) | |
340 | { | |
341 | /* unused */ | |
342 | bcs->hw.ser = NULL; | |
343 | return 1; | |
344 | } | |
345 | ||
346 | /* | |
347 | * Free B channel structure | |
348 | * Called by "gigaset_freebcs" in common.c | |
349 | */ | |
350 | static int gigaset_freebcshw(struct bc_state *bcs) | |
351 | { | |
352 | /* unused */ | |
353 | return 1; | |
354 | } | |
355 | ||
356 | /* | |
357 | * Reinitialize B channel structure | |
358 | * This is called by "bcs_reinit" in common.c | |
359 | */ | |
360 | static void gigaset_reinitbcshw(struct bc_state *bcs) | |
361 | { | |
362 | /* nothing to do for M10x */ | |
363 | } | |
364 | ||
365 | /* | |
366 | * Free hardware specific device data | |
367 | * This will be called by "gigaset_freecs" in common.c | |
368 | */ | |
369 | static void gigaset_freecshw(struct cardstate *cs) | |
370 | { | |
371 | tasklet_kill(&cs->write_tasklet); | |
372 | if (!cs->hw.ser) | |
373 | return; | |
374 | dev_set_drvdata(&cs->hw.ser->dev.dev, NULL); | |
375 | platform_device_unregister(&cs->hw.ser->dev); | |
376 | kfree(cs->hw.ser); | |
377 | cs->hw.ser = NULL; | |
378 | } | |
379 | ||
380 | static void gigaset_device_release(struct device *dev) | |
381 | { | |
71b3e0c1 | 382 | struct platform_device *pdev = to_platform_device(dev); |
2869b23e TS |
383 | |
384 | /* adapted from platform_device_release() in drivers/base/platform.c */ | |
2869b23e TS |
385 | kfree(dev->platform_data); |
386 | kfree(pdev->resource); | |
387 | } | |
388 | ||
389 | /* | |
390 | * Set up hardware specific device data | |
391 | * This is called by "gigaset_initcs" in common.c | |
392 | */ | |
393 | static int gigaset_initcshw(struct cardstate *cs) | |
394 | { | |
395 | int rc; | |
ae67d7d8 | 396 | struct ser_cardstate *scs; |
2869b23e | 397 | |
ae67d7d8 TS |
398 | scs = kzalloc(sizeof(struct ser_cardstate), GFP_KERNEL); |
399 | if (!scs) { | |
c8770dca | 400 | pr_err("out of memory\n"); |
2869b23e TS |
401 | return 0; |
402 | } | |
ae67d7d8 | 403 | cs->hw.ser = scs; |
2869b23e TS |
404 | |
405 | cs->hw.ser->dev.name = GIGASET_MODULENAME; | |
406 | cs->hw.ser->dev.id = cs->minor_index; | |
407 | cs->hw.ser->dev.dev.release = gigaset_device_release; | |
ae67d7d8 TS |
408 | rc = platform_device_register(&cs->hw.ser->dev); |
409 | if (rc != 0) { | |
c8770dca | 410 | pr_err("error %d registering platform device\n", rc); |
2869b23e TS |
411 | kfree(cs->hw.ser); |
412 | cs->hw.ser = NULL; | |
413 | return 0; | |
414 | } | |
415 | dev_set_drvdata(&cs->hw.ser->dev.dev, cs); | |
416 | ||
417 | tasklet_init(&cs->write_tasklet, | |
5452fee2 | 418 | gigaset_modem_fill, (unsigned long) cs); |
2869b23e TS |
419 | return 1; |
420 | } | |
421 | ||
422 | /* | |
423 | * set modem control lines | |
424 | * Parameters: | |
425 | * card state structure | |
426 | * modem control line state ([TIOCM_DTR]|[TIOCM_RTS]) | |
427 | * Called by "gigaset_start" and "gigaset_enterconfigmode" in common.c | |
428 | * and by "if_lock" and "if_termios" in interface.c | |
429 | */ | |
ae67d7d8 TS |
430 | static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state, |
431 | unsigned new_state) | |
2869b23e TS |
432 | { |
433 | struct tty_struct *tty = cs->hw.ser->tty; | |
434 | unsigned int set, clear; | |
435 | ||
f34d7a5b AC |
436 | if (!tty || !tty->driver || !tty->ops->tiocmset) |
437 | return -EINVAL; | |
2869b23e TS |
438 | set = new_state & ~old_state; |
439 | clear = old_state & ~new_state; | |
440 | if (!set && !clear) | |
441 | return 0; | |
442 | gig_dbg(DEBUG_IF, "tiocmset set %x clear %x", set, clear); | |
f34d7a5b | 443 | return tty->ops->tiocmset(tty, NULL, set, clear); |
2869b23e TS |
444 | } |
445 | ||
446 | static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag) | |
447 | { | |
448 | return -EINVAL; | |
449 | } | |
450 | ||
451 | static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag) | |
452 | { | |
453 | return -EINVAL; | |
454 | } | |
455 | ||
35dc8457 | 456 | static const struct gigaset_ops ops = { |
2869b23e TS |
457 | gigaset_write_cmd, |
458 | gigaset_write_room, | |
459 | gigaset_chars_in_buffer, | |
460 | gigaset_brkchars, | |
461 | gigaset_init_bchannel, | |
462 | gigaset_close_bchannel, | |
463 | gigaset_initbcshw, | |
464 | gigaset_freebcshw, | |
465 | gigaset_reinitbcshw, | |
466 | gigaset_initcshw, | |
467 | gigaset_freecshw, | |
468 | gigaset_set_modem_ctrl, | |
469 | gigaset_baud_rate, | |
470 | gigaset_set_line_ctrl, | |
471 | gigaset_m10x_send_skb, /* asyncdata.c */ | |
472 | gigaset_m10x_input, /* asyncdata.c */ | |
473 | }; | |
474 | ||
475 | ||
476 | /* Line Discipline Interface */ | |
477 | /* ========================= */ | |
478 | ||
479 | /* helper functions for cardstate refcounting */ | |
480 | static struct cardstate *cs_get(struct tty_struct *tty) | |
481 | { | |
482 | struct cardstate *cs = tty->disc_data; | |
483 | ||
484 | if (!cs || !cs->hw.ser) { | |
485 | gig_dbg(DEBUG_ANY, "%s: no cardstate", __func__); | |
486 | return NULL; | |
487 | } | |
488 | atomic_inc(&cs->hw.ser->refcnt); | |
489 | return cs; | |
490 | } | |
491 | ||
492 | static void cs_put(struct cardstate *cs) | |
493 | { | |
494 | if (atomic_dec_and_test(&cs->hw.ser->refcnt)) | |
ee51ef0e | 495 | complete(&cs->hw.ser->dead_cmp); |
2869b23e TS |
496 | } |
497 | ||
498 | /* | |
499 | * Called by the tty driver when the line discipline is pushed onto the tty. | |
500 | * Called in process context. | |
501 | */ | |
502 | static int | |
503 | gigaset_tty_open(struct tty_struct *tty) | |
504 | { | |
505 | struct cardstate *cs; | |
506 | ||
507 | gig_dbg(DEBUG_INIT, "Starting HLL for Gigaset M101"); | |
508 | ||
c8770dca | 509 | pr_info(DRIVER_DESC "\n"); |
2869b23e TS |
510 | |
511 | if (!driver) { | |
c8770dca | 512 | pr_err("%s: no driver structure\n", __func__); |
2869b23e TS |
513 | return -ENODEV; |
514 | } | |
515 | ||
516 | /* allocate memory for our device state and intialize it */ | |
ae67d7d8 TS |
517 | cs = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME); |
518 | if (!cs) | |
2869b23e TS |
519 | goto error; |
520 | ||
521 | cs->dev = &cs->hw.ser->dev.dev; | |
522 | cs->hw.ser->tty = tty; | |
2869b23e | 523 | atomic_set(&cs->hw.ser->refcnt, 1); |
ee51ef0e | 524 | init_completion(&cs->hw.ser->dead_cmp); |
2869b23e TS |
525 | |
526 | tty->disc_data = cs; | |
527 | ||
528 | /* OK.. Initialization of the datastructures and the HW is done.. Now | |
529 | * startup system and notify the LL that we are ready to run | |
530 | */ | |
531 | if (startmode == SM_LOCKED) | |
9d4bee2b | 532 | cs->mstate = MS_LOCKED; |
2869b23e TS |
533 | if (!gigaset_start(cs)) { |
534 | tasklet_kill(&cs->write_tasklet); | |
535 | goto error; | |
536 | } | |
537 | ||
538 | gig_dbg(DEBUG_INIT, "Startup of HLL done"); | |
2869b23e TS |
539 | return 0; |
540 | ||
541 | error: | |
542 | gig_dbg(DEBUG_INIT, "Startup of HLL failed"); | |
543 | tty->disc_data = NULL; | |
544 | gigaset_freecs(cs); | |
545 | return -ENODEV; | |
546 | } | |
547 | ||
548 | /* | |
549 | * Called by the tty driver when the line discipline is removed. | |
550 | * Called from process context. | |
551 | */ | |
552 | static void | |
553 | gigaset_tty_close(struct tty_struct *tty) | |
554 | { | |
555 | struct cardstate *cs = tty->disc_data; | |
556 | ||
557 | gig_dbg(DEBUG_INIT, "Stopping HLL for Gigaset M101"); | |
558 | ||
559 | if (!cs) { | |
560 | gig_dbg(DEBUG_INIT, "%s: no cardstate", __func__); | |
561 | return; | |
562 | } | |
563 | ||
564 | /* prevent other callers from entering ldisc methods */ | |
565 | tty->disc_data = NULL; | |
566 | ||
567 | if (!cs->hw.ser) | |
c8770dca | 568 | pr_err("%s: no hw cardstate\n", __func__); |
2869b23e TS |
569 | else { |
570 | /* wait for running methods to finish */ | |
571 | if (!atomic_dec_and_test(&cs->hw.ser->refcnt)) | |
ee51ef0e | 572 | wait_for_completion(&cs->hw.ser->dead_cmp); |
2869b23e TS |
573 | } |
574 | ||
575 | /* stop operations */ | |
576 | gigaset_stop(cs); | |
577 | tasklet_kill(&cs->write_tasklet); | |
578 | flush_send_queue(cs); | |
579 | cs->dev = NULL; | |
580 | gigaset_freecs(cs); | |
581 | ||
582 | gig_dbg(DEBUG_INIT, "Shutdown of HLL done"); | |
583 | } | |
584 | ||
585 | /* | |
586 | * Called by the tty driver when the tty line is hung up. | |
587 | * Wait for I/O to driver to complete and unregister ISDN device. | |
588 | * This is already done by the close routine, so just call that. | |
589 | * Called from process context. | |
590 | */ | |
591 | static int gigaset_tty_hangup(struct tty_struct *tty) | |
592 | { | |
593 | gigaset_tty_close(tty); | |
594 | return 0; | |
595 | } | |
596 | ||
597 | /* | |
598 | * Read on the tty. | |
599 | * Unused, received data goes only to the Gigaset driver. | |
600 | */ | |
601 | static ssize_t | |
602 | gigaset_tty_read(struct tty_struct *tty, struct file *file, | |
603 | unsigned char __user *buf, size_t count) | |
604 | { | |
605 | return -EAGAIN; | |
606 | } | |
607 | ||
608 | /* | |
609 | * Write on the tty. | |
610 | * Unused, transmit data comes only from the Gigaset driver. | |
611 | */ | |
612 | static ssize_t | |
613 | gigaset_tty_write(struct tty_struct *tty, struct file *file, | |
614 | const unsigned char *buf, size_t count) | |
615 | { | |
616 | return -EAGAIN; | |
617 | } | |
618 | ||
619 | /* | |
620 | * Ioctl on the tty. | |
621 | * Called in process context only. | |
622 | * May be re-entered by multiple ioctl calling threads. | |
623 | */ | |
624 | static int | |
625 | gigaset_tty_ioctl(struct tty_struct *tty, struct file *file, | |
626 | unsigned int cmd, unsigned long arg) | |
627 | { | |
628 | struct cardstate *cs = cs_get(tty); | |
629 | int rc, val; | |
630 | int __user *p = (int __user *)arg; | |
631 | ||
632 | if (!cs) | |
633 | return -ENXIO; | |
634 | ||
635 | switch (cmd) { | |
ea1afd25 AC |
636 | |
637 | case FIONREAD: | |
638 | /* unused, always return zero */ | |
639 | val = 0; | |
640 | rc = put_user(val, p); | |
2869b23e TS |
641 | break; |
642 | ||
643 | case TCFLSH: | |
644 | /* flush our buffers and the serial port's buffer */ | |
645 | switch (arg) { | |
646 | case TCIFLUSH: | |
647 | /* no own input buffer to flush */ | |
648 | break; | |
649 | case TCIOFLUSH: | |
650 | case TCOFLUSH: | |
651 | flush_send_queue(cs); | |
652 | break; | |
653 | } | |
ea1afd25 | 654 | /* Pass through */ |
2869b23e TS |
655 | |
656 | default: | |
ea1afd25 AC |
657 | /* pass through to underlying serial device */ |
658 | rc = n_tty_ioctl_helper(tty, file, cmd, arg); | |
659 | break; | |
2869b23e | 660 | } |
2869b23e TS |
661 | cs_put(cs); |
662 | return rc; | |
663 | } | |
664 | ||
2869b23e TS |
665 | /* |
666 | * Called by the tty driver when a block of data has been received. | |
667 | * Will not be re-entered while running but other ldisc functions | |
668 | * may be called in parallel. | |
669 | * Can be called from hard interrupt level as well as soft interrupt | |
670 | * level or mainline. | |
671 | * Parameters: | |
672 | * tty tty structure | |
673 | * buf buffer containing received characters | |
674 | * cflags buffer containing error flags for received characters (ignored) | |
675 | * count number of received characters | |
676 | */ | |
677 | static void | |
678 | gigaset_tty_receive(struct tty_struct *tty, const unsigned char *buf, | |
679 | char *cflags, int count) | |
680 | { | |
681 | struct cardstate *cs = cs_get(tty); | |
682 | unsigned tail, head, n; | |
683 | struct inbuf_t *inbuf; | |
684 | ||
685 | if (!cs) | |
686 | return; | |
ae67d7d8 TS |
687 | inbuf = cs->inbuf; |
688 | if (!inbuf) { | |
2869b23e TS |
689 | dev_err(cs->dev, "%s: no inbuf\n", __func__); |
690 | cs_put(cs); | |
691 | return; | |
692 | } | |
693 | ||
9d4bee2b TS |
694 | tail = inbuf->tail; |
695 | head = inbuf->head; | |
2869b23e TS |
696 | gig_dbg(DEBUG_INTR, "buffer state: %u -> %u, receive %u bytes", |
697 | head, tail, count); | |
698 | ||
699 | if (head <= tail) { | |
700 | /* possible buffer wraparound */ | |
701 | n = min_t(unsigned, count, RBUFSIZE - tail); | |
702 | memcpy(inbuf->data + tail, buf, n); | |
703 | tail = (tail + n) % RBUFSIZE; | |
704 | buf += n; | |
705 | count -= n; | |
706 | } | |
707 | ||
708 | if (count > 0) { | |
709 | /* tail < head and some data left */ | |
710 | n = head - tail - 1; | |
711 | if (count > n) { | |
712 | dev_err(cs->dev, | |
713 | "inbuf overflow, discarding %d bytes\n", | |
714 | count - n); | |
715 | count = n; | |
716 | } | |
717 | memcpy(inbuf->data + tail, buf, count); | |
718 | tail += count; | |
719 | } | |
720 | ||
721 | gig_dbg(DEBUG_INTR, "setting tail to %u", tail); | |
9d4bee2b | 722 | inbuf->tail = tail; |
2869b23e TS |
723 | |
724 | /* Everything was received .. Push data into handler */ | |
725 | gig_dbg(DEBUG_INTR, "%s-->BH", __func__); | |
726 | gigaset_schedule_event(cs); | |
727 | cs_put(cs); | |
728 | } | |
729 | ||
730 | /* | |
731 | * Called by the tty driver when there's room for more data to send. | |
732 | */ | |
733 | static void | |
734 | gigaset_tty_wakeup(struct tty_struct *tty) | |
735 | { | |
736 | struct cardstate *cs = cs_get(tty); | |
737 | ||
738 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
739 | if (!cs) | |
740 | return; | |
741 | tasklet_schedule(&cs->write_tasklet); | |
742 | cs_put(cs); | |
743 | } | |
744 | ||
a352def2 | 745 | static struct tty_ldisc_ops gigaset_ldisc = { |
2869b23e TS |
746 | .owner = THIS_MODULE, |
747 | .magic = TTY_LDISC_MAGIC, | |
748 | .name = "ser_gigaset", | |
749 | .open = gigaset_tty_open, | |
750 | .close = gigaset_tty_close, | |
751 | .hangup = gigaset_tty_hangup, | |
752 | .read = gigaset_tty_read, | |
753 | .write = gigaset_tty_write, | |
754 | .ioctl = gigaset_tty_ioctl, | |
2869b23e TS |
755 | .receive_buf = gigaset_tty_receive, |
756 | .write_wakeup = gigaset_tty_wakeup, | |
757 | }; | |
758 | ||
759 | ||
760 | /* Initialization / Shutdown */ | |
761 | /* ========================= */ | |
762 | ||
763 | static int __init ser_gigaset_init(void) | |
764 | { | |
765 | int rc; | |
766 | ||
767 | gig_dbg(DEBUG_INIT, "%s", __func__); | |
ae67d7d8 TS |
768 | rc = platform_driver_register(&device_driver); |
769 | if (rc != 0) { | |
c8770dca | 770 | pr_err("error %d registering platform driver\n", rc); |
2869b23e TS |
771 | return rc; |
772 | } | |
773 | ||
774 | /* allocate memory for our driver state and intialize it */ | |
ae67d7d8 | 775 | driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS, |
2869b23e | 776 | GIGASET_MODULENAME, GIGASET_DEVNAME, |
ae67d7d8 TS |
777 | &ops, THIS_MODULE); |
778 | if (!driver) | |
2869b23e TS |
779 | goto error; |
780 | ||
ae67d7d8 TS |
781 | rc = tty_register_ldisc(N_GIGASET_M101, &gigaset_ldisc); |
782 | if (rc != 0) { | |
c8770dca | 783 | pr_err("error %d registering line discipline\n", rc); |
2869b23e TS |
784 | goto error; |
785 | } | |
786 | ||
787 | return 0; | |
788 | ||
789 | error: | |
790 | if (driver) { | |
791 | gigaset_freedriver(driver); | |
792 | driver = NULL; | |
793 | } | |
794 | platform_driver_unregister(&device_driver); | |
795 | return rc; | |
796 | } | |
797 | ||
798 | static void __exit ser_gigaset_exit(void) | |
799 | { | |
800 | int rc; | |
801 | ||
802 | gig_dbg(DEBUG_INIT, "%s", __func__); | |
803 | ||
804 | if (driver) { | |
805 | gigaset_freedriver(driver); | |
806 | driver = NULL; | |
807 | } | |
808 | ||
ae67d7d8 TS |
809 | rc = tty_unregister_ldisc(N_GIGASET_M101); |
810 | if (rc != 0) | |
c8770dca | 811 | pr_err("error %d unregistering line discipline\n", rc); |
2869b23e TS |
812 | |
813 | platform_driver_unregister(&device_driver); | |
814 | } | |
815 | ||
816 | module_init(ser_gigaset_init); | |
817 | module_exit(ser_gigaset_exit); |