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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" | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/moduleparam.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/tty.h> | |
ee51ef0e | 19 | #include <linux/completion.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
2869b23e TS |
21 | |
22 | /* Version Information */ | |
23 | #define DRIVER_AUTHOR "Tilman Schmidt" | |
24 | #define DRIVER_DESC "Serial Driver for Gigaset 307x using Siemens M101" | |
25 | ||
26 | #define GIGASET_MINORS 1 | |
27 | #define GIGASET_MINOR 0 | |
28 | #define GIGASET_MODULENAME "ser_gigaset" | |
29 | #define GIGASET_DEVNAME "ttyGS" | |
30 | ||
31 | /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */ | |
32 | #define IF_WRITEBUF 264 | |
33 | ||
34 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
35 | MODULE_DESCRIPTION(DRIVER_DESC); | |
36 | MODULE_LICENSE("GPL"); | |
37 | MODULE_ALIAS_LDISC(N_GIGASET_M101); | |
38 | ||
39 | static int startmode = SM_ISDN; | |
40 | module_param(startmode, int, S_IRUGO); | |
41 | MODULE_PARM_DESC(startmode, "initial operation mode"); | |
42 | static int cidmode = 1; | |
43 | module_param(cidmode, int, S_IRUGO); | |
44 | MODULE_PARM_DESC(cidmode, "stay in CID mode when idle"); | |
45 | ||
46 | static struct gigaset_driver *driver; | |
47 | ||
48 | struct ser_cardstate { | |
49 | struct platform_device dev; | |
50 | struct tty_struct *tty; | |
51 | atomic_t refcnt; | |
ee51ef0e | 52 | struct completion dead_cmp; |
2869b23e TS |
53 | }; |
54 | ||
55 | static struct platform_driver device_driver = { | |
56 | .driver = { | |
57 | .name = GIGASET_MODULENAME, | |
58 | }, | |
59 | }; | |
60 | ||
61 | static void flush_send_queue(struct cardstate *); | |
62 | ||
63 | /* transmit data from current open skb | |
64 | * result: number of bytes sent or error code < 0 | |
65 | */ | |
66 | static int write_modem(struct cardstate *cs) | |
67 | { | |
68 | struct tty_struct *tty = cs->hw.ser->tty; | |
69 | struct bc_state *bcs = &cs->bcs[0]; /* only one channel */ | |
70 | struct sk_buff *skb = bcs->tx_skb; | |
f34d7a5b | 71 | int sent = -EOPNOTSUPP; |
2869b23e TS |
72 | |
73 | if (!tty || !tty->driver || !skb) | |
f34d7a5b | 74 | return -EINVAL; |
2869b23e TS |
75 | |
76 | if (!skb->len) { | |
77 | dev_kfree_skb_any(skb); | |
78 | bcs->tx_skb = NULL; | |
79 | return -EINVAL; | |
80 | } | |
81 | ||
82 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
f34d7a5b AC |
83 | if (tty->ops->write) |
84 | sent = tty->ops->write(tty, skb->data, skb->len); | |
2869b23e TS |
85 | gig_dbg(DEBUG_OUTPUT, "write_modem: sent %d", sent); |
86 | if (sent < 0) { | |
87 | /* error */ | |
88 | flush_send_queue(cs); | |
89 | return sent; | |
90 | } | |
91 | skb_pull(skb, sent); | |
92 | if (!skb->len) { | |
93 | /* skb sent completely */ | |
94 | gigaset_skb_sent(bcs, skb); | |
95 | ||
96 | gig_dbg(DEBUG_INTR, "kfree skb (Adr: %lx)!", | |
97 | (unsigned long) skb); | |
98 | dev_kfree_skb_any(skb); | |
99 | bcs->tx_skb = NULL; | |
100 | } | |
101 | return sent; | |
102 | } | |
103 | ||
104 | /* | |
105 | * transmit first queued command buffer | |
106 | * result: number of bytes sent or error code < 0 | |
107 | */ | |
108 | static int send_cb(struct cardstate *cs) | |
109 | { | |
110 | struct tty_struct *tty = cs->hw.ser->tty; | |
111 | struct cmdbuf_t *cb, *tcb; | |
112 | unsigned long flags; | |
113 | int sent = 0; | |
114 | ||
115 | if (!tty || !tty->driver) | |
116 | return -EFAULT; | |
117 | ||
118 | cb = cs->cmdbuf; | |
119 | if (!cb) | |
120 | return 0; /* nothing to do */ | |
121 | ||
122 | if (cb->len) { | |
123 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
f34d7a5b | 124 | sent = tty->ops->write(tty, cb->buf + cb->offset, cb->len); |
2869b23e TS |
125 | if (sent < 0) { |
126 | /* error */ | |
127 | gig_dbg(DEBUG_OUTPUT, "send_cb: write error %d", sent); | |
128 | flush_send_queue(cs); | |
129 | return sent; | |
130 | } | |
131 | cb->offset += sent; | |
132 | cb->len -= sent; | |
133 | gig_dbg(DEBUG_OUTPUT, "send_cb: sent %d, left %u, queued %u", | |
134 | sent, cb->len, cs->cmdbytes); | |
135 | } | |
136 | ||
137 | while (cb && !cb->len) { | |
138 | spin_lock_irqsave(&cs->cmdlock, flags); | |
139 | cs->cmdbytes -= cs->curlen; | |
140 | tcb = cb; | |
141 | cs->cmdbuf = cb = cb->next; | |
142 | if (cb) { | |
143 | cb->prev = NULL; | |
144 | cs->curlen = cb->len; | |
145 | } else { | |
146 | cs->lastcmdbuf = NULL; | |
147 | cs->curlen = 0; | |
148 | } | |
149 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
150 | ||
151 | if (tcb->wake_tasklet) | |
152 | tasklet_schedule(tcb->wake_tasklet); | |
153 | kfree(tcb); | |
154 | } | |
155 | return sent; | |
156 | } | |
157 | ||
158 | /* | |
159 | * send queue tasklet | |
160 | * If there is already a skb opened, put data to the transfer buffer | |
161 | * by calling "write_modem". | |
162 | * Otherwise take a new skb out of the queue. | |
163 | */ | |
164 | static void gigaset_modem_fill(unsigned long data) | |
165 | { | |
166 | struct cardstate *cs = (struct cardstate *) data; | |
167 | struct bc_state *bcs; | |
ae67d7d8 | 168 | struct sk_buff *nextskb; |
2869b23e TS |
169 | int sent = 0; |
170 | ||
ae67d7d8 TS |
171 | if (!cs) { |
172 | gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__); | |
173 | return; | |
174 | } | |
175 | bcs = cs->bcs; | |
176 | if (!bcs) { | |
2869b23e TS |
177 | gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__); |
178 | return; | |
179 | } | |
180 | if (!bcs->tx_skb) { | |
181 | /* no skb is being sent; send command if any */ | |
182 | sent = send_cb(cs); | |
183 | gig_dbg(DEBUG_OUTPUT, "%s: send_cb -> %d", __func__, sent); | |
184 | if (sent) | |
185 | /* something sent or error */ | |
186 | return; | |
187 | ||
188 | /* no command to send; get skb */ | |
ae67d7d8 TS |
189 | nextskb = skb_dequeue(&bcs->squeue); |
190 | if (!nextskb) | |
2869b23e TS |
191 | /* no skb either, nothing to do */ |
192 | return; | |
ae67d7d8 | 193 | bcs->tx_skb = nextskb; |
2869b23e TS |
194 | |
195 | gig_dbg(DEBUG_INTR, "Dequeued skb (Adr: %lx)", | |
196 | (unsigned long) bcs->tx_skb); | |
197 | } | |
198 | ||
199 | /* send skb */ | |
200 | gig_dbg(DEBUG_OUTPUT, "%s: tx_skb", __func__); | |
201 | if (write_modem(cs) < 0) | |
202 | gig_dbg(DEBUG_OUTPUT, "%s: write_modem failed", __func__); | |
203 | } | |
204 | ||
205 | /* | |
206 | * throw away all data queued for sending | |
207 | */ | |
208 | static void flush_send_queue(struct cardstate *cs) | |
209 | { | |
210 | struct sk_buff *skb; | |
211 | struct cmdbuf_t *cb; | |
212 | unsigned long flags; | |
213 | ||
214 | /* command queue */ | |
215 | spin_lock_irqsave(&cs->cmdlock, flags); | |
216 | while ((cb = cs->cmdbuf) != NULL) { | |
217 | cs->cmdbuf = cb->next; | |
218 | if (cb->wake_tasklet) | |
219 | tasklet_schedule(cb->wake_tasklet); | |
220 | kfree(cb); | |
221 | } | |
222 | cs->cmdbuf = cs->lastcmdbuf = NULL; | |
223 | cs->cmdbytes = cs->curlen = 0; | |
224 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
225 | ||
226 | /* data queue */ | |
227 | if (cs->bcs->tx_skb) | |
228 | dev_kfree_skb_any(cs->bcs->tx_skb); | |
229 | while ((skb = skb_dequeue(&cs->bcs->squeue)) != NULL) | |
230 | dev_kfree_skb_any(skb); | |
231 | } | |
232 | ||
233 | ||
234 | /* Gigaset Driver Interface */ | |
235 | /* ======================== */ | |
236 | ||
237 | /* | |
238 | * queue an AT command string for transmission to the Gigaset device | |
239 | * parameters: | |
240 | * cs controller state structure | |
241 | * buf buffer containing the string to send | |
242 | * len number of characters to send | |
243 | * wake_tasklet tasklet to run when transmission is complete, or NULL | |
244 | * return value: | |
245 | * number of bytes queued, or error code < 0 | |
246 | */ | |
247 | static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf, | |
ae67d7d8 | 248 | int len, struct tasklet_struct *wake_tasklet) |
2869b23e TS |
249 | { |
250 | struct cmdbuf_t *cb; | |
251 | unsigned long flags; | |
252 | ||
9d4bee2b | 253 | gigaset_dbg_buffer(cs->mstate != MS_LOCKED ? |
ae67d7d8 TS |
254 | DEBUG_TRANSCMD : DEBUG_LOCKCMD, |
255 | "CMD Transmit", len, buf); | |
2869b23e TS |
256 | |
257 | if (len <= 0) | |
258 | return 0; | |
259 | ||
ae67d7d8 TS |
260 | cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC); |
261 | if (!cb) { | |
2869b23e TS |
262 | dev_err(cs->dev, "%s: out of memory!\n", __func__); |
263 | return -ENOMEM; | |
264 | } | |
265 | ||
266 | memcpy(cb->buf, buf, len); | |
267 | cb->len = len; | |
268 | cb->offset = 0; | |
269 | cb->next = NULL; | |
270 | cb->wake_tasklet = wake_tasklet; | |
271 | ||
272 | spin_lock_irqsave(&cs->cmdlock, flags); | |
273 | cb->prev = cs->lastcmdbuf; | |
274 | if (cs->lastcmdbuf) | |
275 | cs->lastcmdbuf->next = cb; | |
276 | else { | |
277 | cs->cmdbuf = cb; | |
278 | cs->curlen = len; | |
279 | } | |
280 | cs->cmdbytes += len; | |
281 | cs->lastcmdbuf = cb; | |
282 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
283 | ||
284 | spin_lock_irqsave(&cs->lock, flags); | |
285 | if (cs->connected) | |
286 | tasklet_schedule(&cs->write_tasklet); | |
287 | spin_unlock_irqrestore(&cs->lock, flags); | |
288 | return len; | |
289 | } | |
290 | ||
291 | /* | |
292 | * tty_driver.write_room interface routine | |
293 | * return number of characters the driver will accept to be written | |
294 | * parameter: | |
295 | * controller state structure | |
296 | * return value: | |
297 | * number of characters | |
298 | */ | |
299 | static int gigaset_write_room(struct cardstate *cs) | |
300 | { | |
301 | unsigned bytes; | |
302 | ||
303 | bytes = cs->cmdbytes; | |
304 | return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0; | |
305 | } | |
306 | ||
307 | /* | |
308 | * tty_driver.chars_in_buffer interface routine | |
309 | * return number of characters waiting to be sent | |
310 | * parameter: | |
311 | * controller state structure | |
312 | * return value: | |
313 | * number of characters | |
314 | */ | |
315 | static int gigaset_chars_in_buffer(struct cardstate *cs) | |
316 | { | |
317 | return cs->cmdbytes; | |
318 | } | |
319 | ||
320 | /* | |
321 | * implementation of ioctl(GIGASET_BRKCHARS) | |
322 | * parameter: | |
323 | * controller state structure | |
324 | * return value: | |
325 | * -EINVAL (unimplemented function) | |
326 | */ | |
327 | static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6]) | |
328 | { | |
329 | /* not implemented */ | |
330 | return -EINVAL; | |
331 | } | |
332 | ||
333 | /* | |
334 | * Open B channel | |
335 | * Called by "do_action" in ev-layer.c | |
336 | */ | |
337 | static int gigaset_init_bchannel(struct bc_state *bcs) | |
338 | { | |
339 | /* nothing to do for M10x */ | |
340 | gigaset_bchannel_up(bcs); | |
341 | return 0; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Close B channel | |
346 | * Called by "do_action" in ev-layer.c | |
347 | */ | |
348 | static int gigaset_close_bchannel(struct bc_state *bcs) | |
349 | { | |
350 | /* nothing to do for M10x */ | |
351 | gigaset_bchannel_down(bcs); | |
352 | return 0; | |
353 | } | |
354 | ||
355 | /* | |
356 | * Set up B channel structure | |
357 | * This is called by "gigaset_initcs" in common.c | |
358 | */ | |
359 | static int gigaset_initbcshw(struct bc_state *bcs) | |
360 | { | |
361 | /* unused */ | |
362 | bcs->hw.ser = NULL; | |
363 | return 1; | |
364 | } | |
365 | ||
366 | /* | |
367 | * Free B channel structure | |
368 | * Called by "gigaset_freebcs" in common.c | |
369 | */ | |
370 | static int gigaset_freebcshw(struct bc_state *bcs) | |
371 | { | |
372 | /* unused */ | |
373 | return 1; | |
374 | } | |
375 | ||
376 | /* | |
377 | * Reinitialize B channel structure | |
378 | * This is called by "bcs_reinit" in common.c | |
379 | */ | |
380 | static void gigaset_reinitbcshw(struct bc_state *bcs) | |
381 | { | |
382 | /* nothing to do for M10x */ | |
383 | } | |
384 | ||
385 | /* | |
386 | * Free hardware specific device data | |
387 | * This will be called by "gigaset_freecs" in common.c | |
388 | */ | |
389 | static void gigaset_freecshw(struct cardstate *cs) | |
390 | { | |
391 | tasklet_kill(&cs->write_tasklet); | |
392 | if (!cs->hw.ser) | |
393 | return; | |
394 | dev_set_drvdata(&cs->hw.ser->dev.dev, NULL); | |
395 | platform_device_unregister(&cs->hw.ser->dev); | |
396 | kfree(cs->hw.ser); | |
397 | cs->hw.ser = NULL; | |
398 | } | |
399 | ||
400 | static void gigaset_device_release(struct device *dev) | |
401 | { | |
71b3e0c1 | 402 | struct platform_device *pdev = to_platform_device(dev); |
2869b23e TS |
403 | |
404 | /* adapted from platform_device_release() in drivers/base/platform.c */ | |
2869b23e TS |
405 | kfree(dev->platform_data); |
406 | kfree(pdev->resource); | |
407 | } | |
408 | ||
409 | /* | |
410 | * Set up hardware specific device data | |
411 | * This is called by "gigaset_initcs" in common.c | |
412 | */ | |
413 | static int gigaset_initcshw(struct cardstate *cs) | |
414 | { | |
415 | int rc; | |
ae67d7d8 | 416 | struct ser_cardstate *scs; |
2869b23e | 417 | |
ae67d7d8 TS |
418 | scs = kzalloc(sizeof(struct ser_cardstate), GFP_KERNEL); |
419 | if (!scs) { | |
c8770dca | 420 | pr_err("out of memory\n"); |
2869b23e TS |
421 | return 0; |
422 | } | |
ae67d7d8 | 423 | cs->hw.ser = scs; |
2869b23e TS |
424 | |
425 | cs->hw.ser->dev.name = GIGASET_MODULENAME; | |
426 | cs->hw.ser->dev.id = cs->minor_index; | |
427 | cs->hw.ser->dev.dev.release = gigaset_device_release; | |
ae67d7d8 TS |
428 | rc = platform_device_register(&cs->hw.ser->dev); |
429 | if (rc != 0) { | |
c8770dca | 430 | pr_err("error %d registering platform device\n", rc); |
2869b23e TS |
431 | kfree(cs->hw.ser); |
432 | cs->hw.ser = NULL; | |
433 | return 0; | |
434 | } | |
435 | dev_set_drvdata(&cs->hw.ser->dev.dev, cs); | |
436 | ||
437 | tasklet_init(&cs->write_tasklet, | |
5452fee2 | 438 | gigaset_modem_fill, (unsigned long) cs); |
2869b23e TS |
439 | return 1; |
440 | } | |
441 | ||
442 | /* | |
443 | * set modem control lines | |
444 | * Parameters: | |
445 | * card state structure | |
446 | * modem control line state ([TIOCM_DTR]|[TIOCM_RTS]) | |
447 | * Called by "gigaset_start" and "gigaset_enterconfigmode" in common.c | |
448 | * and by "if_lock" and "if_termios" in interface.c | |
449 | */ | |
ae67d7d8 TS |
450 | static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state, |
451 | unsigned new_state) | |
2869b23e TS |
452 | { |
453 | struct tty_struct *tty = cs->hw.ser->tty; | |
454 | unsigned int set, clear; | |
455 | ||
f34d7a5b AC |
456 | if (!tty || !tty->driver || !tty->ops->tiocmset) |
457 | return -EINVAL; | |
2869b23e TS |
458 | set = new_state & ~old_state; |
459 | clear = old_state & ~new_state; | |
460 | if (!set && !clear) | |
461 | return 0; | |
462 | gig_dbg(DEBUG_IF, "tiocmset set %x clear %x", set, clear); | |
f34d7a5b | 463 | return tty->ops->tiocmset(tty, NULL, set, clear); |
2869b23e TS |
464 | } |
465 | ||
466 | static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag) | |
467 | { | |
468 | return -EINVAL; | |
469 | } | |
470 | ||
471 | static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag) | |
472 | { | |
473 | return -EINVAL; | |
474 | } | |
475 | ||
35dc8457 | 476 | static const struct gigaset_ops ops = { |
2869b23e TS |
477 | gigaset_write_cmd, |
478 | gigaset_write_room, | |
479 | gigaset_chars_in_buffer, | |
480 | gigaset_brkchars, | |
481 | gigaset_init_bchannel, | |
482 | gigaset_close_bchannel, | |
483 | gigaset_initbcshw, | |
484 | gigaset_freebcshw, | |
485 | gigaset_reinitbcshw, | |
486 | gigaset_initcshw, | |
487 | gigaset_freecshw, | |
488 | gigaset_set_modem_ctrl, | |
489 | gigaset_baud_rate, | |
490 | gigaset_set_line_ctrl, | |
491 | gigaset_m10x_send_skb, /* asyncdata.c */ | |
492 | gigaset_m10x_input, /* asyncdata.c */ | |
493 | }; | |
494 | ||
495 | ||
496 | /* Line Discipline Interface */ | |
497 | /* ========================= */ | |
498 | ||
499 | /* helper functions for cardstate refcounting */ | |
500 | static struct cardstate *cs_get(struct tty_struct *tty) | |
501 | { | |
502 | struct cardstate *cs = tty->disc_data; | |
503 | ||
504 | if (!cs || !cs->hw.ser) { | |
505 | gig_dbg(DEBUG_ANY, "%s: no cardstate", __func__); | |
506 | return NULL; | |
507 | } | |
508 | atomic_inc(&cs->hw.ser->refcnt); | |
509 | return cs; | |
510 | } | |
511 | ||
512 | static void cs_put(struct cardstate *cs) | |
513 | { | |
514 | if (atomic_dec_and_test(&cs->hw.ser->refcnt)) | |
ee51ef0e | 515 | complete(&cs->hw.ser->dead_cmp); |
2869b23e TS |
516 | } |
517 | ||
518 | /* | |
519 | * Called by the tty driver when the line discipline is pushed onto the tty. | |
520 | * Called in process context. | |
521 | */ | |
522 | static int | |
523 | gigaset_tty_open(struct tty_struct *tty) | |
524 | { | |
525 | struct cardstate *cs; | |
526 | ||
527 | gig_dbg(DEBUG_INIT, "Starting HLL for Gigaset M101"); | |
528 | ||
c8770dca | 529 | pr_info(DRIVER_DESC "\n"); |
2869b23e TS |
530 | |
531 | if (!driver) { | |
c8770dca | 532 | pr_err("%s: no driver structure\n", __func__); |
2869b23e TS |
533 | return -ENODEV; |
534 | } | |
535 | ||
536 | /* allocate memory for our device state and intialize it */ | |
ae67d7d8 TS |
537 | cs = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME); |
538 | if (!cs) | |
2869b23e TS |
539 | goto error; |
540 | ||
541 | cs->dev = &cs->hw.ser->dev.dev; | |
542 | cs->hw.ser->tty = tty; | |
2869b23e | 543 | atomic_set(&cs->hw.ser->refcnt, 1); |
ee51ef0e | 544 | init_completion(&cs->hw.ser->dead_cmp); |
2869b23e TS |
545 | |
546 | tty->disc_data = cs; | |
547 | ||
548 | /* OK.. Initialization of the datastructures and the HW is done.. Now | |
549 | * startup system and notify the LL that we are ready to run | |
550 | */ | |
551 | if (startmode == SM_LOCKED) | |
9d4bee2b | 552 | cs->mstate = MS_LOCKED; |
2869b23e TS |
553 | if (!gigaset_start(cs)) { |
554 | tasklet_kill(&cs->write_tasklet); | |
555 | goto error; | |
556 | } | |
557 | ||
558 | gig_dbg(DEBUG_INIT, "Startup of HLL done"); | |
2869b23e TS |
559 | return 0; |
560 | ||
561 | error: | |
562 | gig_dbg(DEBUG_INIT, "Startup of HLL failed"); | |
563 | tty->disc_data = NULL; | |
564 | gigaset_freecs(cs); | |
565 | return -ENODEV; | |
566 | } | |
567 | ||
568 | /* | |
569 | * Called by the tty driver when the line discipline is removed. | |
570 | * Called from process context. | |
571 | */ | |
572 | static void | |
573 | gigaset_tty_close(struct tty_struct *tty) | |
574 | { | |
575 | struct cardstate *cs = tty->disc_data; | |
576 | ||
577 | gig_dbg(DEBUG_INIT, "Stopping HLL for Gigaset M101"); | |
578 | ||
579 | if (!cs) { | |
580 | gig_dbg(DEBUG_INIT, "%s: no cardstate", __func__); | |
581 | return; | |
582 | } | |
583 | ||
584 | /* prevent other callers from entering ldisc methods */ | |
585 | tty->disc_data = NULL; | |
586 | ||
587 | if (!cs->hw.ser) | |
c8770dca | 588 | pr_err("%s: no hw cardstate\n", __func__); |
2869b23e TS |
589 | else { |
590 | /* wait for running methods to finish */ | |
591 | if (!atomic_dec_and_test(&cs->hw.ser->refcnt)) | |
ee51ef0e | 592 | wait_for_completion(&cs->hw.ser->dead_cmp); |
2869b23e TS |
593 | } |
594 | ||
595 | /* stop operations */ | |
596 | gigaset_stop(cs); | |
597 | tasklet_kill(&cs->write_tasklet); | |
598 | flush_send_queue(cs); | |
599 | cs->dev = NULL; | |
600 | gigaset_freecs(cs); | |
601 | ||
602 | gig_dbg(DEBUG_INIT, "Shutdown of HLL done"); | |
603 | } | |
604 | ||
605 | /* | |
606 | * Called by the tty driver when the tty line is hung up. | |
607 | * Wait for I/O to driver to complete and unregister ISDN device. | |
608 | * This is already done by the close routine, so just call that. | |
609 | * Called from process context. | |
610 | */ | |
611 | static int gigaset_tty_hangup(struct tty_struct *tty) | |
612 | { | |
613 | gigaset_tty_close(tty); | |
614 | return 0; | |
615 | } | |
616 | ||
617 | /* | |
618 | * Read on the tty. | |
619 | * Unused, received data goes only to the Gigaset driver. | |
620 | */ | |
621 | static ssize_t | |
622 | gigaset_tty_read(struct tty_struct *tty, struct file *file, | |
623 | unsigned char __user *buf, size_t count) | |
624 | { | |
625 | return -EAGAIN; | |
626 | } | |
627 | ||
628 | /* | |
629 | * Write on the tty. | |
630 | * Unused, transmit data comes only from the Gigaset driver. | |
631 | */ | |
632 | static ssize_t | |
633 | gigaset_tty_write(struct tty_struct *tty, struct file *file, | |
634 | const unsigned char *buf, size_t count) | |
635 | { | |
636 | return -EAGAIN; | |
637 | } | |
638 | ||
639 | /* | |
640 | * Ioctl on the tty. | |
641 | * Called in process context only. | |
642 | * May be re-entered by multiple ioctl calling threads. | |
643 | */ | |
644 | static int | |
645 | gigaset_tty_ioctl(struct tty_struct *tty, struct file *file, | |
646 | unsigned int cmd, unsigned long arg) | |
647 | { | |
648 | struct cardstate *cs = cs_get(tty); | |
649 | int rc, val; | |
650 | int __user *p = (int __user *)arg; | |
651 | ||
652 | if (!cs) | |
653 | return -ENXIO; | |
654 | ||
655 | switch (cmd) { | |
ea1afd25 AC |
656 | |
657 | case FIONREAD: | |
658 | /* unused, always return zero */ | |
659 | val = 0; | |
660 | rc = put_user(val, p); | |
2869b23e TS |
661 | break; |
662 | ||
663 | case TCFLSH: | |
664 | /* flush our buffers and the serial port's buffer */ | |
665 | switch (arg) { | |
666 | case TCIFLUSH: | |
667 | /* no own input buffer to flush */ | |
668 | break; | |
669 | case TCIOFLUSH: | |
670 | case TCOFLUSH: | |
671 | flush_send_queue(cs); | |
672 | break; | |
673 | } | |
ea1afd25 | 674 | /* Pass through */ |
2869b23e TS |
675 | |
676 | default: | |
ea1afd25 AC |
677 | /* pass through to underlying serial device */ |
678 | rc = n_tty_ioctl_helper(tty, file, cmd, arg); | |
679 | break; | |
2869b23e | 680 | } |
2869b23e TS |
681 | cs_put(cs); |
682 | return rc; | |
683 | } | |
684 | ||
2869b23e TS |
685 | /* |
686 | * Called by the tty driver when a block of data has been received. | |
687 | * Will not be re-entered while running but other ldisc functions | |
688 | * may be called in parallel. | |
689 | * Can be called from hard interrupt level as well as soft interrupt | |
690 | * level or mainline. | |
691 | * Parameters: | |
692 | * tty tty structure | |
693 | * buf buffer containing received characters | |
694 | * cflags buffer containing error flags for received characters (ignored) | |
695 | * count number of received characters | |
696 | */ | |
697 | static void | |
698 | gigaset_tty_receive(struct tty_struct *tty, const unsigned char *buf, | |
699 | char *cflags, int count) | |
700 | { | |
701 | struct cardstate *cs = cs_get(tty); | |
702 | unsigned tail, head, n; | |
703 | struct inbuf_t *inbuf; | |
704 | ||
705 | if (!cs) | |
706 | return; | |
ae67d7d8 TS |
707 | inbuf = cs->inbuf; |
708 | if (!inbuf) { | |
2869b23e TS |
709 | dev_err(cs->dev, "%s: no inbuf\n", __func__); |
710 | cs_put(cs); | |
711 | return; | |
712 | } | |
713 | ||
9d4bee2b TS |
714 | tail = inbuf->tail; |
715 | head = inbuf->head; | |
2869b23e TS |
716 | gig_dbg(DEBUG_INTR, "buffer state: %u -> %u, receive %u bytes", |
717 | head, tail, count); | |
718 | ||
719 | if (head <= tail) { | |
720 | /* possible buffer wraparound */ | |
721 | n = min_t(unsigned, count, RBUFSIZE - tail); | |
722 | memcpy(inbuf->data + tail, buf, n); | |
723 | tail = (tail + n) % RBUFSIZE; | |
724 | buf += n; | |
725 | count -= n; | |
726 | } | |
727 | ||
728 | if (count > 0) { | |
729 | /* tail < head and some data left */ | |
730 | n = head - tail - 1; | |
731 | if (count > n) { | |
732 | dev_err(cs->dev, | |
733 | "inbuf overflow, discarding %d bytes\n", | |
734 | count - n); | |
735 | count = n; | |
736 | } | |
737 | memcpy(inbuf->data + tail, buf, count); | |
738 | tail += count; | |
739 | } | |
740 | ||
741 | gig_dbg(DEBUG_INTR, "setting tail to %u", tail); | |
9d4bee2b | 742 | inbuf->tail = tail; |
2869b23e TS |
743 | |
744 | /* Everything was received .. Push data into handler */ | |
745 | gig_dbg(DEBUG_INTR, "%s-->BH", __func__); | |
746 | gigaset_schedule_event(cs); | |
747 | cs_put(cs); | |
748 | } | |
749 | ||
750 | /* | |
751 | * Called by the tty driver when there's room for more data to send. | |
752 | */ | |
753 | static void | |
754 | gigaset_tty_wakeup(struct tty_struct *tty) | |
755 | { | |
756 | struct cardstate *cs = cs_get(tty); | |
757 | ||
758 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
759 | if (!cs) | |
760 | return; | |
761 | tasklet_schedule(&cs->write_tasklet); | |
762 | cs_put(cs); | |
763 | } | |
764 | ||
a352def2 | 765 | static struct tty_ldisc_ops gigaset_ldisc = { |
2869b23e TS |
766 | .owner = THIS_MODULE, |
767 | .magic = TTY_LDISC_MAGIC, | |
768 | .name = "ser_gigaset", | |
769 | .open = gigaset_tty_open, | |
770 | .close = gigaset_tty_close, | |
771 | .hangup = gigaset_tty_hangup, | |
772 | .read = gigaset_tty_read, | |
773 | .write = gigaset_tty_write, | |
774 | .ioctl = gigaset_tty_ioctl, | |
2869b23e TS |
775 | .receive_buf = gigaset_tty_receive, |
776 | .write_wakeup = gigaset_tty_wakeup, | |
777 | }; | |
778 | ||
779 | ||
780 | /* Initialization / Shutdown */ | |
781 | /* ========================= */ | |
782 | ||
783 | static int __init ser_gigaset_init(void) | |
784 | { | |
785 | int rc; | |
786 | ||
787 | gig_dbg(DEBUG_INIT, "%s", __func__); | |
ae67d7d8 TS |
788 | rc = platform_driver_register(&device_driver); |
789 | if (rc != 0) { | |
c8770dca | 790 | pr_err("error %d registering platform driver\n", rc); |
2869b23e TS |
791 | return rc; |
792 | } | |
793 | ||
794 | /* allocate memory for our driver state and intialize it */ | |
ae67d7d8 | 795 | driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS, |
2869b23e | 796 | GIGASET_MODULENAME, GIGASET_DEVNAME, |
ae67d7d8 TS |
797 | &ops, THIS_MODULE); |
798 | if (!driver) | |
2869b23e TS |
799 | goto error; |
800 | ||
ae67d7d8 TS |
801 | rc = tty_register_ldisc(N_GIGASET_M101, &gigaset_ldisc); |
802 | if (rc != 0) { | |
c8770dca | 803 | pr_err("error %d registering line discipline\n", rc); |
2869b23e TS |
804 | goto error; |
805 | } | |
806 | ||
807 | return 0; | |
808 | ||
809 | error: | |
810 | if (driver) { | |
811 | gigaset_freedriver(driver); | |
812 | driver = NULL; | |
813 | } | |
814 | platform_driver_unregister(&device_driver); | |
815 | return rc; | |
816 | } | |
817 | ||
818 | static void __exit ser_gigaset_exit(void) | |
819 | { | |
820 | int rc; | |
821 | ||
822 | gig_dbg(DEBUG_INIT, "%s", __func__); | |
823 | ||
824 | if (driver) { | |
825 | gigaset_freedriver(driver); | |
826 | driver = NULL; | |
827 | } | |
828 | ||
ae67d7d8 TS |
829 | rc = tty_unregister_ldisc(N_GIGASET_M101); |
830 | if (rc != 0) | |
c8770dca | 831 | pr_err("error %d unregistering line discipline\n", rc); |
2869b23e TS |
832 | |
833 | platform_driver_unregister(&device_driver); | |
834 | } | |
835 | ||
836 | module_init(ser_gigaset_init); | |
837 | module_exit(ser_gigaset_exit); |