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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 | 69 | |
ede03d30 | 70 | WARN_ON(!tty || !tty->ops || !skb); |
2869b23e TS |
71 | |
72 | if (!skb->len) { | |
73 | dev_kfree_skb_any(skb); | |
74 | bcs->tx_skb = NULL; | |
75 | return -EINVAL; | |
76 | } | |
77 | ||
78 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
f34d7a5b AC |
79 | if (tty->ops->write) |
80 | sent = tty->ops->write(tty, skb->data, skb->len); | |
2869b23e TS |
81 | gig_dbg(DEBUG_OUTPUT, "write_modem: sent %d", sent); |
82 | if (sent < 0) { | |
83 | /* error */ | |
84 | flush_send_queue(cs); | |
85 | return sent; | |
86 | } | |
87 | skb_pull(skb, sent); | |
88 | if (!skb->len) { | |
89 | /* skb sent completely */ | |
90 | gigaset_skb_sent(bcs, skb); | |
91 | ||
92 | gig_dbg(DEBUG_INTR, "kfree skb (Adr: %lx)!", | |
93 | (unsigned long) skb); | |
94 | dev_kfree_skb_any(skb); | |
95 | bcs->tx_skb = NULL; | |
96 | } | |
97 | return sent; | |
98 | } | |
99 | ||
100 | /* | |
101 | * transmit first queued command buffer | |
102 | * result: number of bytes sent or error code < 0 | |
103 | */ | |
104 | static int send_cb(struct cardstate *cs) | |
105 | { | |
106 | struct tty_struct *tty = cs->hw.ser->tty; | |
107 | struct cmdbuf_t *cb, *tcb; | |
108 | unsigned long flags; | |
109 | int sent = 0; | |
110 | ||
ede03d30 | 111 | WARN_ON(!tty || !tty->ops); |
2869b23e TS |
112 | |
113 | cb = cs->cmdbuf; | |
114 | if (!cb) | |
115 | return 0; /* nothing to do */ | |
116 | ||
117 | if (cb->len) { | |
118 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
f34d7a5b | 119 | sent = tty->ops->write(tty, cb->buf + cb->offset, cb->len); |
2869b23e TS |
120 | if (sent < 0) { |
121 | /* error */ | |
122 | gig_dbg(DEBUG_OUTPUT, "send_cb: write error %d", sent); | |
123 | flush_send_queue(cs); | |
124 | return sent; | |
125 | } | |
126 | cb->offset += sent; | |
127 | cb->len -= sent; | |
128 | gig_dbg(DEBUG_OUTPUT, "send_cb: sent %d, left %u, queued %u", | |
129 | sent, cb->len, cs->cmdbytes); | |
130 | } | |
131 | ||
132 | while (cb && !cb->len) { | |
133 | spin_lock_irqsave(&cs->cmdlock, flags); | |
134 | cs->cmdbytes -= cs->curlen; | |
135 | tcb = cb; | |
136 | cs->cmdbuf = cb = cb->next; | |
137 | if (cb) { | |
138 | cb->prev = NULL; | |
139 | cs->curlen = cb->len; | |
140 | } else { | |
141 | cs->lastcmdbuf = NULL; | |
142 | cs->curlen = 0; | |
143 | } | |
144 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
145 | ||
146 | if (tcb->wake_tasklet) | |
147 | tasklet_schedule(tcb->wake_tasklet); | |
148 | kfree(tcb); | |
149 | } | |
150 | return sent; | |
151 | } | |
152 | ||
153 | /* | |
154 | * send queue tasklet | |
155 | * If there is already a skb opened, put data to the transfer buffer | |
156 | * by calling "write_modem". | |
157 | * Otherwise take a new skb out of the queue. | |
158 | */ | |
159 | static void gigaset_modem_fill(unsigned long data) | |
160 | { | |
161 | struct cardstate *cs = (struct cardstate *) data; | |
162 | struct bc_state *bcs; | |
ae67d7d8 | 163 | struct sk_buff *nextskb; |
2869b23e TS |
164 | int sent = 0; |
165 | ||
ae67d7d8 TS |
166 | if (!cs) { |
167 | gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__); | |
168 | return; | |
169 | } | |
170 | bcs = cs->bcs; | |
171 | if (!bcs) { | |
2869b23e TS |
172 | gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__); |
173 | return; | |
174 | } | |
175 | if (!bcs->tx_skb) { | |
176 | /* no skb is being sent; send command if any */ | |
177 | sent = send_cb(cs); | |
178 | gig_dbg(DEBUG_OUTPUT, "%s: send_cb -> %d", __func__, sent); | |
179 | if (sent) | |
180 | /* something sent or error */ | |
181 | return; | |
182 | ||
183 | /* no command to send; get skb */ | |
ae67d7d8 TS |
184 | nextskb = skb_dequeue(&bcs->squeue); |
185 | if (!nextskb) | |
2869b23e TS |
186 | /* no skb either, nothing to do */ |
187 | return; | |
ae67d7d8 | 188 | bcs->tx_skb = nextskb; |
2869b23e TS |
189 | |
190 | gig_dbg(DEBUG_INTR, "Dequeued skb (Adr: %lx)", | |
191 | (unsigned long) bcs->tx_skb); | |
192 | } | |
193 | ||
194 | /* send skb */ | |
195 | gig_dbg(DEBUG_OUTPUT, "%s: tx_skb", __func__); | |
196 | if (write_modem(cs) < 0) | |
197 | gig_dbg(DEBUG_OUTPUT, "%s: write_modem failed", __func__); | |
198 | } | |
199 | ||
200 | /* | |
201 | * throw away all data queued for sending | |
202 | */ | |
203 | static void flush_send_queue(struct cardstate *cs) | |
204 | { | |
205 | struct sk_buff *skb; | |
206 | struct cmdbuf_t *cb; | |
207 | unsigned long flags; | |
208 | ||
209 | /* command queue */ | |
210 | spin_lock_irqsave(&cs->cmdlock, flags); | |
211 | while ((cb = cs->cmdbuf) != NULL) { | |
212 | cs->cmdbuf = cb->next; | |
213 | if (cb->wake_tasklet) | |
214 | tasklet_schedule(cb->wake_tasklet); | |
215 | kfree(cb); | |
216 | } | |
217 | cs->cmdbuf = cs->lastcmdbuf = NULL; | |
218 | cs->cmdbytes = cs->curlen = 0; | |
219 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
220 | ||
221 | /* data queue */ | |
222 | if (cs->bcs->tx_skb) | |
223 | dev_kfree_skb_any(cs->bcs->tx_skb); | |
224 | while ((skb = skb_dequeue(&cs->bcs->squeue)) != NULL) | |
225 | dev_kfree_skb_any(skb); | |
226 | } | |
227 | ||
228 | ||
229 | /* Gigaset Driver Interface */ | |
230 | /* ======================== */ | |
231 | ||
232 | /* | |
233 | * queue an AT command string for transmission to the Gigaset device | |
234 | * parameters: | |
235 | * cs controller state structure | |
236 | * buf buffer containing the string to send | |
237 | * len number of characters to send | |
238 | * wake_tasklet tasklet to run when transmission is complete, or NULL | |
239 | * return value: | |
240 | * number of bytes queued, or error code < 0 | |
241 | */ | |
e3628dd1 | 242 | static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb) |
2869b23e | 243 | { |
2869b23e TS |
244 | unsigned long flags; |
245 | ||
9d4bee2b | 246 | gigaset_dbg_buffer(cs->mstate != MS_LOCKED ? |
475be4d8 | 247 | DEBUG_TRANSCMD : DEBUG_LOCKCMD, |
e3628dd1 | 248 | "CMD Transmit", cb->len, cb->buf); |
2869b23e TS |
249 | |
250 | spin_lock_irqsave(&cs->cmdlock, flags); | |
251 | cb->prev = cs->lastcmdbuf; | |
252 | if (cs->lastcmdbuf) | |
253 | cs->lastcmdbuf->next = cb; | |
254 | else { | |
255 | cs->cmdbuf = cb; | |
e3628dd1 | 256 | cs->curlen = cb->len; |
2869b23e | 257 | } |
e3628dd1 | 258 | cs->cmdbytes += cb->len; |
2869b23e TS |
259 | cs->lastcmdbuf = cb; |
260 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
261 | ||
262 | spin_lock_irqsave(&cs->lock, flags); | |
263 | if (cs->connected) | |
264 | tasklet_schedule(&cs->write_tasklet); | |
265 | spin_unlock_irqrestore(&cs->lock, flags); | |
e3628dd1 | 266 | return cb->len; |
2869b23e TS |
267 | } |
268 | ||
269 | /* | |
270 | * tty_driver.write_room interface routine | |
271 | * return number of characters the driver will accept to be written | |
272 | * parameter: | |
273 | * controller state structure | |
274 | * return value: | |
275 | * number of characters | |
276 | */ | |
277 | static int gigaset_write_room(struct cardstate *cs) | |
278 | { | |
279 | unsigned bytes; | |
280 | ||
281 | bytes = cs->cmdbytes; | |
282 | return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0; | |
283 | } | |
284 | ||
285 | /* | |
286 | * tty_driver.chars_in_buffer interface routine | |
287 | * return number of characters waiting to be sent | |
288 | * parameter: | |
289 | * controller state structure | |
290 | * return value: | |
291 | * number of characters | |
292 | */ | |
293 | static int gigaset_chars_in_buffer(struct cardstate *cs) | |
294 | { | |
295 | return cs->cmdbytes; | |
296 | } | |
297 | ||
298 | /* | |
299 | * implementation of ioctl(GIGASET_BRKCHARS) | |
300 | * parameter: | |
301 | * controller state structure | |
302 | * return value: | |
303 | * -EINVAL (unimplemented function) | |
304 | */ | |
305 | static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6]) | |
306 | { | |
307 | /* not implemented */ | |
308 | return -EINVAL; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Open B channel | |
313 | * Called by "do_action" in ev-layer.c | |
314 | */ | |
315 | static int gigaset_init_bchannel(struct bc_state *bcs) | |
316 | { | |
317 | /* nothing to do for M10x */ | |
318 | gigaset_bchannel_up(bcs); | |
319 | return 0; | |
320 | } | |
321 | ||
322 | /* | |
323 | * Close B channel | |
324 | * Called by "do_action" in ev-layer.c | |
325 | */ | |
326 | static int gigaset_close_bchannel(struct bc_state *bcs) | |
327 | { | |
328 | /* nothing to do for M10x */ | |
329 | gigaset_bchannel_down(bcs); | |
330 | return 0; | |
331 | } | |
332 | ||
333 | /* | |
334 | * Set up B channel structure | |
335 | * This is called by "gigaset_initcs" in common.c | |
336 | */ | |
337 | static int gigaset_initbcshw(struct bc_state *bcs) | |
338 | { | |
339 | /* unused */ | |
340 | bcs->hw.ser = NULL; | |
81fa7b82 | 341 | return 0; |
2869b23e TS |
342 | } |
343 | ||
344 | /* | |
345 | * Free B channel structure | |
346 | * Called by "gigaset_freebcs" in common.c | |
347 | */ | |
81fa7b82 | 348 | static void gigaset_freebcshw(struct bc_state *bcs) |
2869b23e TS |
349 | { |
350 | /* unused */ | |
2869b23e TS |
351 | } |
352 | ||
353 | /* | |
354 | * Reinitialize B channel structure | |
355 | * This is called by "bcs_reinit" in common.c | |
356 | */ | |
357 | static void gigaset_reinitbcshw(struct bc_state *bcs) | |
358 | { | |
359 | /* nothing to do for M10x */ | |
360 | } | |
361 | ||
362 | /* | |
363 | * Free hardware specific device data | |
364 | * This will be called by "gigaset_freecs" in common.c | |
365 | */ | |
366 | static void gigaset_freecshw(struct cardstate *cs) | |
367 | { | |
368 | tasklet_kill(&cs->write_tasklet); | |
369 | if (!cs->hw.ser) | |
370 | return; | |
2869b23e | 371 | platform_device_unregister(&cs->hw.ser->dev); |
2869b23e TS |
372 | } |
373 | ||
374 | static void gigaset_device_release(struct device *dev) | |
375 | { | |
4c5e354a | 376 | struct cardstate *cs = dev_get_drvdata(dev); |
2869b23e | 377 | |
4c5e354a TS |
378 | if (!cs) |
379 | return; | |
380 | dev_set_drvdata(dev, NULL); | |
381 | kfree(cs->hw.ser); | |
382 | cs->hw.ser = NULL; | |
2869b23e TS |
383 | } |
384 | ||
385 | /* | |
386 | * Set up hardware specific device data | |
387 | * This is called by "gigaset_initcs" in common.c | |
388 | */ | |
389 | static int gigaset_initcshw(struct cardstate *cs) | |
390 | { | |
391 | int rc; | |
ae67d7d8 | 392 | struct ser_cardstate *scs; |
2869b23e | 393 | |
ae67d7d8 TS |
394 | scs = kzalloc(sizeof(struct ser_cardstate), GFP_KERNEL); |
395 | if (!scs) { | |
c8770dca | 396 | pr_err("out of memory\n"); |
81fa7b82 | 397 | return -ENOMEM; |
2869b23e | 398 | } |
ae67d7d8 | 399 | cs->hw.ser = scs; |
2869b23e TS |
400 | |
401 | cs->hw.ser->dev.name = GIGASET_MODULENAME; | |
402 | cs->hw.ser->dev.id = cs->minor_index; | |
403 | cs->hw.ser->dev.dev.release = gigaset_device_release; | |
ae67d7d8 TS |
404 | rc = platform_device_register(&cs->hw.ser->dev); |
405 | if (rc != 0) { | |
c8770dca | 406 | pr_err("error %d registering platform device\n", rc); |
2869b23e TS |
407 | kfree(cs->hw.ser); |
408 | cs->hw.ser = NULL; | |
81fa7b82 | 409 | return rc; |
2869b23e TS |
410 | } |
411 | dev_set_drvdata(&cs->hw.ser->dev.dev, cs); | |
412 | ||
413 | tasklet_init(&cs->write_tasklet, | |
5452fee2 | 414 | gigaset_modem_fill, (unsigned long) cs); |
81fa7b82 | 415 | return 0; |
2869b23e TS |
416 | } |
417 | ||
418 | /* | |
419 | * set modem control lines | |
420 | * Parameters: | |
421 | * card state structure | |
422 | * modem control line state ([TIOCM_DTR]|[TIOCM_RTS]) | |
423 | * Called by "gigaset_start" and "gigaset_enterconfigmode" in common.c | |
424 | * and by "if_lock" and "if_termios" in interface.c | |
425 | */ | |
ae67d7d8 TS |
426 | static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state, |
427 | unsigned new_state) | |
2869b23e TS |
428 | { |
429 | struct tty_struct *tty = cs->hw.ser->tty; | |
430 | unsigned int set, clear; | |
431 | ||
ede03d30 AC |
432 | WARN_ON(!tty || !tty->ops); |
433 | /* tiocmset is an optional tty driver method */ | |
434 | if (!tty->ops->tiocmset) | |
f34d7a5b | 435 | return -EINVAL; |
2869b23e TS |
436 | set = new_state & ~old_state; |
437 | clear = old_state & ~new_state; | |
438 | if (!set && !clear) | |
439 | return 0; | |
440 | gig_dbg(DEBUG_IF, "tiocmset set %x clear %x", set, clear); | |
20b9d177 | 441 | return tty->ops->tiocmset(tty, set, clear); |
2869b23e TS |
442 | } |
443 | ||
444 | static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag) | |
445 | { | |
446 | return -EINVAL; | |
447 | } | |
448 | ||
449 | static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag) | |
450 | { | |
451 | return -EINVAL; | |
452 | } | |
453 | ||
35dc8457 | 454 | static const struct gigaset_ops ops = { |
2869b23e TS |
455 | gigaset_write_cmd, |
456 | gigaset_write_room, | |
457 | gigaset_chars_in_buffer, | |
458 | gigaset_brkchars, | |
459 | gigaset_init_bchannel, | |
460 | gigaset_close_bchannel, | |
461 | gigaset_initbcshw, | |
462 | gigaset_freebcshw, | |
463 | gigaset_reinitbcshw, | |
464 | gigaset_initcshw, | |
465 | gigaset_freecshw, | |
466 | gigaset_set_modem_ctrl, | |
467 | gigaset_baud_rate, | |
468 | gigaset_set_line_ctrl, | |
469 | gigaset_m10x_send_skb, /* asyncdata.c */ | |
470 | gigaset_m10x_input, /* asyncdata.c */ | |
471 | }; | |
472 | ||
473 | ||
474 | /* Line Discipline Interface */ | |
475 | /* ========================= */ | |
476 | ||
477 | /* helper functions for cardstate refcounting */ | |
478 | static struct cardstate *cs_get(struct tty_struct *tty) | |
479 | { | |
480 | struct cardstate *cs = tty->disc_data; | |
481 | ||
482 | if (!cs || !cs->hw.ser) { | |
483 | gig_dbg(DEBUG_ANY, "%s: no cardstate", __func__); | |
484 | return NULL; | |
485 | } | |
486 | atomic_inc(&cs->hw.ser->refcnt); | |
487 | return cs; | |
488 | } | |
489 | ||
490 | static void cs_put(struct cardstate *cs) | |
491 | { | |
492 | if (atomic_dec_and_test(&cs->hw.ser->refcnt)) | |
ee51ef0e | 493 | complete(&cs->hw.ser->dead_cmp); |
2869b23e TS |
494 | } |
495 | ||
496 | /* | |
497 | * Called by the tty driver when the line discipline is pushed onto the tty. | |
498 | * Called in process context. | |
499 | */ | |
500 | static int | |
501 | gigaset_tty_open(struct tty_struct *tty) | |
502 | { | |
503 | struct cardstate *cs; | |
81fa7b82 | 504 | int rc; |
2869b23e TS |
505 | |
506 | gig_dbg(DEBUG_INIT, "Starting HLL for Gigaset M101"); | |
507 | ||
c8770dca | 508 | pr_info(DRIVER_DESC "\n"); |
2869b23e TS |
509 | |
510 | if (!driver) { | |
c8770dca | 511 | pr_err("%s: no driver structure\n", __func__); |
2869b23e TS |
512 | return -ENODEV; |
513 | } | |
514 | ||
b595076a | 515 | /* allocate memory for our device state and initialize it */ |
ae67d7d8 | 516 | cs = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME); |
81fa7b82 TS |
517 | if (!cs) { |
518 | rc = -ENODEV; | |
2869b23e | 519 | goto error; |
81fa7b82 | 520 | } |
2869b23e TS |
521 | |
522 | cs->dev = &cs->hw.ser->dev.dev; | |
523 | cs->hw.ser->tty = tty; | |
2869b23e | 524 | atomic_set(&cs->hw.ser->refcnt, 1); |
ee51ef0e | 525 | init_completion(&cs->hw.ser->dead_cmp); |
2869b23e TS |
526 | tty->disc_data = cs; |
527 | ||
fd98e941 TS |
528 | /* Set the amount of data we're willing to receive per call |
529 | * from the hardware driver to half of the input buffer size | |
530 | * to leave some reserve. | |
531 | * Note: We don't do flow control towards the hardware driver. | |
532 | * If more data is received than will fit into the input buffer, | |
533 | * it will be dropped and an error will be logged. This should | |
534 | * never happen as the device is slow and the buffer size ample. | |
535 | */ | |
536 | tty->receive_room = RBUFSIZE/2; | |
537 | ||
2869b23e TS |
538 | /* OK.. Initialization of the datastructures and the HW is done.. Now |
539 | * startup system and notify the LL that we are ready to run | |
540 | */ | |
541 | if (startmode == SM_LOCKED) | |
9d4bee2b | 542 | cs->mstate = MS_LOCKED; |
81fa7b82 TS |
543 | rc = gigaset_start(cs); |
544 | if (rc < 0) { | |
2869b23e TS |
545 | tasklet_kill(&cs->write_tasklet); |
546 | goto error; | |
547 | } | |
548 | ||
549 | gig_dbg(DEBUG_INIT, "Startup of HLL done"); | |
2869b23e TS |
550 | return 0; |
551 | ||
552 | error: | |
553 | gig_dbg(DEBUG_INIT, "Startup of HLL failed"); | |
554 | tty->disc_data = NULL; | |
555 | gigaset_freecs(cs); | |
81fa7b82 | 556 | return rc; |
2869b23e TS |
557 | } |
558 | ||
559 | /* | |
560 | * Called by the tty driver when the line discipline is removed. | |
561 | * Called from process context. | |
562 | */ | |
563 | static void | |
564 | gigaset_tty_close(struct tty_struct *tty) | |
565 | { | |
566 | struct cardstate *cs = tty->disc_data; | |
567 | ||
568 | gig_dbg(DEBUG_INIT, "Stopping HLL for Gigaset M101"); | |
569 | ||
570 | if (!cs) { | |
571 | gig_dbg(DEBUG_INIT, "%s: no cardstate", __func__); | |
572 | return; | |
573 | } | |
574 | ||
575 | /* prevent other callers from entering ldisc methods */ | |
576 | tty->disc_data = NULL; | |
577 | ||
578 | if (!cs->hw.ser) | |
c8770dca | 579 | pr_err("%s: no hw cardstate\n", __func__); |
2869b23e TS |
580 | else { |
581 | /* wait for running methods to finish */ | |
582 | if (!atomic_dec_and_test(&cs->hw.ser->refcnt)) | |
ee51ef0e | 583 | wait_for_completion(&cs->hw.ser->dead_cmp); |
2869b23e TS |
584 | } |
585 | ||
586 | /* stop operations */ | |
587 | gigaset_stop(cs); | |
588 | tasklet_kill(&cs->write_tasklet); | |
589 | flush_send_queue(cs); | |
590 | cs->dev = NULL; | |
591 | gigaset_freecs(cs); | |
592 | ||
593 | gig_dbg(DEBUG_INIT, "Shutdown of HLL done"); | |
594 | } | |
595 | ||
596 | /* | |
597 | * Called by the tty driver when the tty line is hung up. | |
598 | * Wait for I/O to driver to complete and unregister ISDN device. | |
599 | * This is already done by the close routine, so just call that. | |
600 | * Called from process context. | |
601 | */ | |
602 | static int gigaset_tty_hangup(struct tty_struct *tty) | |
603 | { | |
604 | gigaset_tty_close(tty); | |
605 | return 0; | |
606 | } | |
607 | ||
2869b23e TS |
608 | /* |
609 | * Ioctl on the tty. | |
610 | * Called in process context only. | |
611 | * May be re-entered by multiple ioctl calling threads. | |
612 | */ | |
613 | static int | |
614 | gigaset_tty_ioctl(struct tty_struct *tty, struct file *file, | |
615 | unsigned int cmd, unsigned long arg) | |
616 | { | |
617 | struct cardstate *cs = cs_get(tty); | |
618 | int rc, val; | |
619 | int __user *p = (int __user *)arg; | |
620 | ||
621 | if (!cs) | |
622 | return -ENXIO; | |
623 | ||
624 | switch (cmd) { | |
ea1afd25 AC |
625 | |
626 | case FIONREAD: | |
627 | /* unused, always return zero */ | |
628 | val = 0; | |
629 | rc = put_user(val, p); | |
2869b23e TS |
630 | break; |
631 | ||
632 | case TCFLSH: | |
633 | /* flush our buffers and the serial port's buffer */ | |
634 | switch (arg) { | |
635 | case TCIFLUSH: | |
636 | /* no own input buffer to flush */ | |
637 | break; | |
638 | case TCIOFLUSH: | |
639 | case TCOFLUSH: | |
640 | flush_send_queue(cs); | |
641 | break; | |
642 | } | |
ea1afd25 | 643 | /* Pass through */ |
2869b23e TS |
644 | |
645 | default: | |
ea1afd25 AC |
646 | /* pass through to underlying serial device */ |
647 | rc = n_tty_ioctl_helper(tty, file, cmd, arg); | |
648 | break; | |
2869b23e | 649 | } |
2869b23e TS |
650 | cs_put(cs); |
651 | return rc; | |
652 | } | |
653 | ||
2869b23e TS |
654 | /* |
655 | * Called by the tty driver when a block of data has been received. | |
656 | * Will not be re-entered while running but other ldisc functions | |
657 | * may be called in parallel. | |
658 | * Can be called from hard interrupt level as well as soft interrupt | |
659 | * level or mainline. | |
660 | * Parameters: | |
661 | * tty tty structure | |
662 | * buf buffer containing received characters | |
663 | * cflags buffer containing error flags for received characters (ignored) | |
664 | * count number of received characters | |
665 | */ | |
55db4c64 | 666 | static void |
2869b23e TS |
667 | gigaset_tty_receive(struct tty_struct *tty, const unsigned char *buf, |
668 | char *cflags, int count) | |
669 | { | |
670 | struct cardstate *cs = cs_get(tty); | |
671 | unsigned tail, head, n; | |
672 | struct inbuf_t *inbuf; | |
673 | ||
674 | if (!cs) | |
55db4c64 | 675 | return; |
ae67d7d8 TS |
676 | inbuf = cs->inbuf; |
677 | if (!inbuf) { | |
2869b23e TS |
678 | dev_err(cs->dev, "%s: no inbuf\n", __func__); |
679 | cs_put(cs); | |
55db4c64 | 680 | return; |
2869b23e TS |
681 | } |
682 | ||
9d4bee2b TS |
683 | tail = inbuf->tail; |
684 | head = inbuf->head; | |
2869b23e TS |
685 | gig_dbg(DEBUG_INTR, "buffer state: %u -> %u, receive %u bytes", |
686 | head, tail, count); | |
687 | ||
688 | if (head <= tail) { | |
689 | /* possible buffer wraparound */ | |
690 | n = min_t(unsigned, count, RBUFSIZE - tail); | |
691 | memcpy(inbuf->data + tail, buf, n); | |
692 | tail = (tail + n) % RBUFSIZE; | |
693 | buf += n; | |
694 | count -= n; | |
695 | } | |
696 | ||
697 | if (count > 0) { | |
698 | /* tail < head and some data left */ | |
699 | n = head - tail - 1; | |
700 | if (count > n) { | |
701 | dev_err(cs->dev, | |
702 | "inbuf overflow, discarding %d bytes\n", | |
703 | count - n); | |
704 | count = n; | |
705 | } | |
706 | memcpy(inbuf->data + tail, buf, count); | |
707 | tail += count; | |
708 | } | |
709 | ||
710 | gig_dbg(DEBUG_INTR, "setting tail to %u", tail); | |
9d4bee2b | 711 | inbuf->tail = tail; |
2869b23e TS |
712 | |
713 | /* Everything was received .. Push data into handler */ | |
714 | gig_dbg(DEBUG_INTR, "%s-->BH", __func__); | |
715 | gigaset_schedule_event(cs); | |
716 | cs_put(cs); | |
717 | } | |
718 | ||
719 | /* | |
720 | * Called by the tty driver when there's room for more data to send. | |
721 | */ | |
722 | static void | |
723 | gigaset_tty_wakeup(struct tty_struct *tty) | |
724 | { | |
725 | struct cardstate *cs = cs_get(tty); | |
726 | ||
727 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
728 | if (!cs) | |
729 | return; | |
730 | tasklet_schedule(&cs->write_tasklet); | |
731 | cs_put(cs); | |
732 | } | |
733 | ||
a352def2 | 734 | static struct tty_ldisc_ops gigaset_ldisc = { |
2869b23e TS |
735 | .owner = THIS_MODULE, |
736 | .magic = TTY_LDISC_MAGIC, | |
737 | .name = "ser_gigaset", | |
738 | .open = gigaset_tty_open, | |
739 | .close = gigaset_tty_close, | |
740 | .hangup = gigaset_tty_hangup, | |
2869b23e | 741 | .ioctl = gigaset_tty_ioctl, |
2869b23e TS |
742 | .receive_buf = gigaset_tty_receive, |
743 | .write_wakeup = gigaset_tty_wakeup, | |
744 | }; | |
745 | ||
746 | ||
747 | /* Initialization / Shutdown */ | |
748 | /* ========================= */ | |
749 | ||
750 | static int __init ser_gigaset_init(void) | |
751 | { | |
752 | int rc; | |
753 | ||
754 | gig_dbg(DEBUG_INIT, "%s", __func__); | |
ae67d7d8 TS |
755 | rc = platform_driver_register(&device_driver); |
756 | if (rc != 0) { | |
c8770dca | 757 | pr_err("error %d registering platform driver\n", rc); |
2869b23e TS |
758 | return rc; |
759 | } | |
760 | ||
b595076a | 761 | /* allocate memory for our driver state and initialize it */ |
ae67d7d8 | 762 | driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS, |
475be4d8 JP |
763 | GIGASET_MODULENAME, GIGASET_DEVNAME, |
764 | &ops, THIS_MODULE); | |
ae67d7d8 | 765 | if (!driver) |
2869b23e TS |
766 | goto error; |
767 | ||
ae67d7d8 TS |
768 | rc = tty_register_ldisc(N_GIGASET_M101, &gigaset_ldisc); |
769 | if (rc != 0) { | |
c8770dca | 770 | pr_err("error %d registering line discipline\n", rc); |
2869b23e TS |
771 | goto error; |
772 | } | |
773 | ||
774 | return 0; | |
775 | ||
776 | error: | |
777 | if (driver) { | |
778 | gigaset_freedriver(driver); | |
779 | driver = NULL; | |
780 | } | |
781 | platform_driver_unregister(&device_driver); | |
782 | return rc; | |
783 | } | |
784 | ||
785 | static void __exit ser_gigaset_exit(void) | |
786 | { | |
787 | int rc; | |
788 | ||
789 | gig_dbg(DEBUG_INIT, "%s", __func__); | |
790 | ||
791 | if (driver) { | |
792 | gigaset_freedriver(driver); | |
793 | driver = NULL; | |
794 | } | |
795 | ||
ae67d7d8 TS |
796 | rc = tty_unregister_ldisc(N_GIGASET_M101); |
797 | if (rc != 0) | |
c8770dca | 798 | pr_err("error %d unregistering line discipline\n", rc); |
2869b23e TS |
799 | |
800 | platform_driver_unregister(&device_driver); | |
801 | } | |
802 | ||
803 | module_init(ser_gigaset_init); | |
804 | module_exit(ser_gigaset_exit); |