Commit | Line | Data |
---|---|---|
165dc591 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include <linux/stddef.h> | |
7 | #include <linux/kernel.h> | |
8 | #include <linux/list.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/tty.h> | |
11 | #include <linux/string.h> | |
12 | #include <linux/tty_flip.h> | |
13 | #include <asm/irq.h> | |
14 | #include "chan_kern.h" | |
15 | #include "user_util.h" | |
16 | #include "kern.h" | |
17 | #include "irq_user.h" | |
18 | #include "sigio.h" | |
19 | #include "line.h" | |
20 | #include "os.h" | |
21 | ||
fac97ae0 PBG |
22 | /* XXX: could well be moved to somewhere else, if needed. */ |
23 | static int my_printf(const char * fmt, ...) | |
24 | __attribute__ ((format (printf, 1, 2))); | |
84ddaa8c | 25 | |
fac97ae0 PBG |
26 | static int my_printf(const char * fmt, ...) |
27 | { | |
28 | /* Yes, can be called on atomic context.*/ | |
29 | char *buf = kmalloc(4096, GFP_ATOMIC); | |
30 | va_list args; | |
31 | int r; | |
32 | ||
33 | if (!buf) { | |
34 | /* We print directly fmt. | |
35 | * Yes, yes, yes, feel free to complain. */ | |
36 | r = strlen(fmt); | |
37 | } else { | |
38 | va_start(args, fmt); | |
39 | r = vsprintf(buf, fmt, args); | |
40 | va_end(args); | |
41 | fmt = buf; | |
42 | } | |
43 | ||
44 | if (r) | |
45 | r = os_write_file(1, fmt, r); | |
46 | return r; | |
47 | ||
48 | } | |
49 | ||
50 | #ifdef CONFIG_NOCONFIG_CHAN | |
51 | /* Despite its name, there's no added trailing newline. */ | |
52 | static int my_puts(const char * buf) | |
53 | { | |
54 | return os_write_file(1, buf, strlen(buf)); | |
55 | } | |
84ddaa8c | 56 | |
1da177e4 LT |
57 | static void *not_configged_init(char *str, int device, struct chan_opts *opts) |
58 | { | |
fac97ae0 | 59 | my_puts("Using a channel type which is configured out of " |
1da177e4 | 60 | "UML\n"); |
d50084a2 | 61 | return NULL; |
1da177e4 LT |
62 | } |
63 | ||
64 | static int not_configged_open(int input, int output, int primary, void *data, | |
65 | char **dev_out) | |
66 | { | |
fac97ae0 | 67 | my_puts("Using a channel type which is configured out of " |
1da177e4 | 68 | "UML\n"); |
d50084a2 | 69 | return -ENODEV; |
1da177e4 LT |
70 | } |
71 | ||
72 | static void not_configged_close(int fd, void *data) | |
73 | { | |
fac97ae0 | 74 | my_puts("Using a channel type which is configured out of " |
1da177e4 LT |
75 | "UML\n"); |
76 | } | |
77 | ||
78 | static int not_configged_read(int fd, char *c_out, void *data) | |
79 | { | |
fac97ae0 | 80 | my_puts("Using a channel type which is configured out of " |
1da177e4 | 81 | "UML\n"); |
d50084a2 | 82 | return -EIO; |
1da177e4 LT |
83 | } |
84 | ||
85 | static int not_configged_write(int fd, const char *buf, int len, void *data) | |
86 | { | |
fac97ae0 | 87 | my_puts("Using a channel type which is configured out of " |
1da177e4 | 88 | "UML\n"); |
d50084a2 | 89 | return -EIO; |
1da177e4 LT |
90 | } |
91 | ||
55c033c1 | 92 | static int not_configged_console_write(int fd, const char *buf, int len) |
1da177e4 | 93 | { |
fac97ae0 | 94 | my_puts("Using a channel type which is configured out of " |
1da177e4 | 95 | "UML\n"); |
d50084a2 | 96 | return -EIO; |
1da177e4 LT |
97 | } |
98 | ||
99 | static int not_configged_window_size(int fd, void *data, unsigned short *rows, | |
100 | unsigned short *cols) | |
101 | { | |
fac97ae0 | 102 | my_puts("Using a channel type which is configured out of " |
1da177e4 | 103 | "UML\n"); |
d50084a2 | 104 | return -ENODEV; |
1da177e4 LT |
105 | } |
106 | ||
107 | static void not_configged_free(void *data) | |
108 | { | |
fac97ae0 | 109 | my_puts("Using a channel type which is configured out of " |
1da177e4 LT |
110 | "UML\n"); |
111 | } | |
112 | ||
113 | static struct chan_ops not_configged_ops = { | |
114 | .init = not_configged_init, | |
115 | .open = not_configged_open, | |
116 | .close = not_configged_close, | |
117 | .read = not_configged_read, | |
118 | .write = not_configged_write, | |
119 | .console_write = not_configged_console_write, | |
120 | .window_size = not_configged_window_size, | |
121 | .free = not_configged_free, | |
122 | .winch = 0, | |
123 | }; | |
124 | #endif /* CONFIG_NOCONFIG_CHAN */ | |
125 | ||
126 | void generic_close(int fd, void *unused) | |
127 | { | |
128 | os_close_file(fd); | |
129 | } | |
130 | ||
131 | int generic_read(int fd, char *c_out, void *unused) | |
132 | { | |
133 | int n; | |
134 | ||
135 | n = os_read_file(fd, c_out, sizeof(*c_out)); | |
136 | ||
137 | if(n == -EAGAIN) | |
d50084a2 | 138 | return 0; |
1da177e4 | 139 | else if(n == 0) |
d50084a2 JD |
140 | return -EIO; |
141 | return n; | |
1da177e4 LT |
142 | } |
143 | ||
144 | /* XXX Trivial wrapper around os_write_file */ | |
145 | ||
146 | int generic_write(int fd, const char *buf, int n, void *unused) | |
147 | { | |
d50084a2 | 148 | return os_write_file(fd, buf, n); |
1da177e4 LT |
149 | } |
150 | ||
151 | int generic_window_size(int fd, void *unused, unsigned short *rows_out, | |
152 | unsigned short *cols_out) | |
153 | { | |
154 | int rows, cols; | |
155 | int ret; | |
156 | ||
157 | ret = os_window_size(fd, &rows, &cols); | |
158 | if(ret < 0) | |
d50084a2 | 159 | return ret; |
1da177e4 LT |
160 | |
161 | ret = ((*rows_out != rows) || (*cols_out != cols)); | |
162 | ||
163 | *rows_out = rows; | |
164 | *cols_out = cols; | |
165 | ||
d50084a2 | 166 | return ret; |
1da177e4 LT |
167 | } |
168 | ||
169 | void generic_free(void *data) | |
170 | { | |
171 | kfree(data); | |
172 | } | |
173 | ||
174 | static void tty_receive_char(struct tty_struct *tty, char ch) | |
175 | { | |
176 | if(tty == NULL) return; | |
177 | ||
178 | if(I_IXON(tty) && !I_IXOFF(tty) && !tty->raw) { | |
179 | if(ch == STOP_CHAR(tty)){ | |
180 | stop_tty(tty); | |
181 | return; | |
182 | } | |
183 | else if(ch == START_CHAR(tty)){ | |
184 | start_tty(tty); | |
185 | return; | |
186 | } | |
187 | } | |
188 | ||
1da177e4 LT |
189 | tty_insert_flip_char(tty, ch, TTY_NORMAL); |
190 | } | |
191 | ||
d50084a2 | 192 | static int open_one_chan(struct chan *chan) |
1da177e4 LT |
193 | { |
194 | int fd; | |
195 | ||
d50084a2 JD |
196 | if(chan->opened) |
197 | return 0; | |
198 | ||
199 | if(chan->ops->open == NULL) | |
200 | fd = 0; | |
201 | else fd = (*chan->ops->open)(chan->input, chan->output, chan->primary, | |
202 | chan->data, &chan->dev); | |
203 | if(fd < 0) | |
204 | return fd; | |
1da177e4 LT |
205 | chan->fd = fd; |
206 | ||
207 | chan->opened = 1; | |
d50084a2 | 208 | return 0; |
1da177e4 LT |
209 | } |
210 | ||
211 | int open_chan(struct list_head *chans) | |
212 | { | |
213 | struct list_head *ele; | |
214 | struct chan *chan; | |
215 | int ret, err = 0; | |
216 | ||
217 | list_for_each(ele, chans){ | |
218 | chan = list_entry(ele, struct chan, list); | |
d50084a2 JD |
219 | ret = open_one_chan(chan); |
220 | if(chan->primary) | |
221 | err = ret; | |
1da177e4 | 222 | } |
d50084a2 | 223 | return err; |
1da177e4 LT |
224 | } |
225 | ||
226 | void chan_enable_winch(struct list_head *chans, struct tty_struct *tty) | |
227 | { | |
228 | struct list_head *ele; | |
229 | struct chan *chan; | |
230 | ||
231 | list_for_each(ele, chans){ | |
232 | chan = list_entry(ele, struct chan, list); | |
233 | if(chan->primary && chan->output && chan->ops->winch){ | |
234 | register_winch(chan->fd, tty); | |
235 | return; | |
236 | } | |
237 | } | |
238 | } | |
239 | ||
165dc591 | 240 | void enable_chan(struct line *line) |
1da177e4 LT |
241 | { |
242 | struct list_head *ele; | |
243 | struct chan *chan; | |
244 | ||
165dc591 | 245 | list_for_each(ele, &line->chan_list){ |
1da177e4 | 246 | chan = list_entry(ele, struct chan, list); |
165dc591 JD |
247 | if(open_one_chan(chan)) |
248 | continue; | |
249 | ||
250 | if(chan->enabled) | |
251 | continue; | |
252 | line_setup_irq(chan->fd, chan->input, chan->output, line, | |
253 | chan); | |
254 | chan->enabled = 1; | |
255 | } | |
256 | } | |
257 | ||
258 | static LIST_HEAD(irqs_to_free); | |
259 | ||
260 | void free_irqs(void) | |
261 | { | |
262 | struct chan *chan; | |
263 | ||
264 | while(!list_empty(&irqs_to_free)){ | |
265 | chan = list_entry(irqs_to_free.next, struct chan, free_list); | |
266 | list_del(&chan->free_list); | |
267 | ||
268 | if(chan->input) | |
269 | free_irq(chan->line->driver->read_irq, chan); | |
270 | if(chan->output) | |
271 | free_irq(chan->line->driver->write_irq, chan); | |
272 | chan->enabled = 0; | |
273 | } | |
274 | } | |
275 | ||
276 | static void close_one_chan(struct chan *chan, int delay_free_irq) | |
277 | { | |
278 | if(!chan->opened) | |
279 | return; | |
1da177e4 | 280 | |
165dc591 JD |
281 | if(delay_free_irq){ |
282 | list_add(&chan->free_list, &irqs_to_free); | |
283 | } | |
284 | else { | |
285 | if(chan->input) | |
286 | free_irq(chan->line->driver->read_irq, chan); | |
287 | if(chan->output) | |
288 | free_irq(chan->line->driver->write_irq, chan); | |
289 | chan->enabled = 0; | |
1da177e4 | 290 | } |
165dc591 JD |
291 | if(chan->ops->close != NULL) |
292 | (*chan->ops->close)(chan->fd, chan->data); | |
293 | ||
294 | chan->opened = 0; | |
295 | chan->fd = -1; | |
1da177e4 LT |
296 | } |
297 | ||
165dc591 | 298 | void close_chan(struct list_head *chans, int delay_free_irq) |
1da177e4 LT |
299 | { |
300 | struct chan *chan; | |
301 | ||
302 | /* Close in reverse order as open in case more than one of them | |
303 | * refers to the same device and they save and restore that device's | |
304 | * state. Then, the first one opened will have the original state, | |
305 | * so it must be the last closed. | |
306 | */ | |
307 | list_for_each_entry_reverse(chan, chans, list) { | |
165dc591 | 308 | close_one_chan(chan, delay_free_irq); |
1da177e4 LT |
309 | } |
310 | } | |
311 | ||
e4dcee80 JD |
312 | void deactivate_chan(struct list_head *chans, int irq) |
313 | { | |
314 | struct list_head *ele; | |
315 | ||
316 | struct chan *chan; | |
317 | list_for_each(ele, chans) { | |
318 | chan = list_entry(ele, struct chan, list); | |
319 | ||
320 | if(chan->enabled && chan->input) | |
321 | deactivate_fd(chan->fd, irq); | |
322 | } | |
323 | } | |
324 | ||
325 | void reactivate_chan(struct list_head *chans, int irq) | |
326 | { | |
327 | struct list_head *ele; | |
328 | struct chan *chan; | |
329 | ||
330 | list_for_each(ele, chans) { | |
331 | chan = list_entry(ele, struct chan, list); | |
332 | ||
333 | if(chan->enabled && chan->input) | |
334 | reactivate_fd(chan->fd, irq); | |
335 | } | |
336 | } | |
337 | ||
d50084a2 | 338 | int write_chan(struct list_head *chans, const char *buf, int len, |
1da177e4 LT |
339 | int write_irq) |
340 | { | |
341 | struct list_head *ele; | |
342 | struct chan *chan = NULL; | |
343 | int n, ret = 0; | |
344 | ||
345 | list_for_each(ele, chans) { | |
346 | chan = list_entry(ele, struct chan, list); | |
347 | if (!chan->output || (chan->ops->write == NULL)) | |
348 | continue; | |
349 | n = chan->ops->write(chan->fd, buf, len, chan->data); | |
350 | if (chan->primary) { | |
351 | ret = n; | |
352 | if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len))) | |
353 | reactivate_fd(chan->fd, write_irq); | |
354 | } | |
355 | } | |
d50084a2 | 356 | return ret; |
1da177e4 LT |
357 | } |
358 | ||
359 | int console_write_chan(struct list_head *chans, const char *buf, int len) | |
360 | { | |
361 | struct list_head *ele; | |
362 | struct chan *chan; | |
363 | int n, ret = 0; | |
364 | ||
365 | list_for_each(ele, chans){ | |
366 | chan = list_entry(ele, struct chan, list); | |
367 | if(!chan->output || (chan->ops->console_write == NULL)) | |
368 | continue; | |
55c033c1 | 369 | n = chan->ops->console_write(chan->fd, buf, len); |
1da177e4 LT |
370 | if(chan->primary) ret = n; |
371 | } | |
d50084a2 | 372 | return ret; |
1da177e4 LT |
373 | } |
374 | ||
d50084a2 JD |
375 | int console_open_chan(struct line *line, struct console *co, |
376 | struct chan_opts *opts) | |
1da177e4 | 377 | { |
1f80171e JD |
378 | int err; |
379 | ||
380 | err = open_chan(&line->chan_list); | |
381 | if(err) | |
382 | return err; | |
1da177e4 | 383 | |
1da177e4 LT |
384 | printk("Console initialized on /dev/%s%d\n",co->name,co->index); |
385 | return 0; | |
386 | } | |
387 | ||
388 | int chan_window_size(struct list_head *chans, unsigned short *rows_out, | |
389 | unsigned short *cols_out) | |
390 | { | |
391 | struct list_head *ele; | |
392 | struct chan *chan; | |
393 | ||
394 | list_for_each(ele, chans){ | |
395 | chan = list_entry(ele, struct chan, list); | |
396 | if(chan->primary){ | |
d50084a2 JD |
397 | if(chan->ops->window_size == NULL) |
398 | return 0; | |
399 | return chan->ops->window_size(chan->fd, chan->data, | |
400 | rows_out, cols_out); | |
1da177e4 LT |
401 | } |
402 | } | |
d50084a2 | 403 | return 0; |
1da177e4 LT |
404 | } |
405 | ||
165dc591 | 406 | void free_one_chan(struct chan *chan, int delay_free_irq) |
1da177e4 LT |
407 | { |
408 | list_del(&chan->list); | |
165dc591 JD |
409 | |
410 | close_one_chan(chan, delay_free_irq); | |
411 | ||
1da177e4 LT |
412 | if(chan->ops->free != NULL) |
413 | (*chan->ops->free)(chan->data); | |
165dc591 | 414 | |
1da177e4 LT |
415 | if(chan->primary && chan->output) ignore_sigio_fd(chan->fd); |
416 | kfree(chan); | |
417 | } | |
418 | ||
165dc591 | 419 | void free_chan(struct list_head *chans, int delay_free_irq) |
1da177e4 LT |
420 | { |
421 | struct list_head *ele, *next; | |
422 | struct chan *chan; | |
423 | ||
424 | list_for_each_safe(ele, next, chans){ | |
425 | chan = list_entry(ele, struct chan, list); | |
165dc591 | 426 | free_one_chan(chan, delay_free_irq); |
1da177e4 LT |
427 | } |
428 | } | |
429 | ||
430 | static int one_chan_config_string(struct chan *chan, char *str, int size, | |
431 | char **error_out) | |
432 | { | |
433 | int n = 0; | |
434 | ||
435 | if(chan == NULL){ | |
436 | CONFIG_CHUNK(str, size, n, "none", 1); | |
d50084a2 | 437 | return n; |
1da177e4 LT |
438 | } |
439 | ||
440 | CONFIG_CHUNK(str, size, n, chan->ops->type, 0); | |
441 | ||
442 | if(chan->dev == NULL){ | |
443 | CONFIG_CHUNK(str, size, n, "", 1); | |
d50084a2 | 444 | return n; |
1da177e4 LT |
445 | } |
446 | ||
447 | CONFIG_CHUNK(str, size, n, ":", 0); | |
448 | CONFIG_CHUNK(str, size, n, chan->dev, 0); | |
449 | ||
d50084a2 | 450 | return n; |
1da177e4 LT |
451 | } |
452 | ||
d50084a2 | 453 | static int chan_pair_config_string(struct chan *in, struct chan *out, |
1da177e4 LT |
454 | char *str, int size, char **error_out) |
455 | { | |
456 | int n; | |
457 | ||
458 | n = one_chan_config_string(in, str, size, error_out); | |
459 | str += n; | |
460 | size -= n; | |
461 | ||
462 | if(in == out){ | |
463 | CONFIG_CHUNK(str, size, n, "", 1); | |
d50084a2 | 464 | return n; |
1da177e4 LT |
465 | } |
466 | ||
467 | CONFIG_CHUNK(str, size, n, ",", 1); | |
468 | n = one_chan_config_string(out, str, size, error_out); | |
469 | str += n; | |
470 | size -= n; | |
471 | CONFIG_CHUNK(str, size, n, "", 1); | |
472 | ||
d50084a2 | 473 | return n; |
1da177e4 LT |
474 | } |
475 | ||
d50084a2 | 476 | int chan_config_string(struct list_head *chans, char *str, int size, |
1da177e4 LT |
477 | char **error_out) |
478 | { | |
479 | struct list_head *ele; | |
480 | struct chan *chan, *in = NULL, *out = NULL; | |
481 | ||
482 | list_for_each(ele, chans){ | |
483 | chan = list_entry(ele, struct chan, list); | |
484 | if(!chan->primary) | |
485 | continue; | |
486 | if(chan->input) | |
487 | in = chan; | |
488 | if(chan->output) | |
489 | out = chan; | |
490 | } | |
491 | ||
d50084a2 | 492 | return chan_pair_config_string(in, out, str, size, error_out); |
1da177e4 LT |
493 | } |
494 | ||
495 | struct chan_type { | |
496 | char *key; | |
497 | struct chan_ops *ops; | |
498 | }; | |
499 | ||
500 | struct chan_type chan_table[] = { | |
501 | { "fd", &fd_ops }, | |
502 | ||
503 | #ifdef CONFIG_NULL_CHAN | |
504 | { "null", &null_ops }, | |
505 | #else | |
506 | { "null", ¬_configged_ops }, | |
507 | #endif | |
508 | ||
509 | #ifdef CONFIG_PORT_CHAN | |
510 | { "port", &port_ops }, | |
511 | #else | |
512 | { "port", ¬_configged_ops }, | |
513 | #endif | |
514 | ||
515 | #ifdef CONFIG_PTY_CHAN | |
516 | { "pty", &pty_ops }, | |
517 | { "pts", &pts_ops }, | |
518 | #else | |
519 | { "pty", ¬_configged_ops }, | |
520 | { "pts", ¬_configged_ops }, | |
521 | #endif | |
522 | ||
523 | #ifdef CONFIG_TTY_CHAN | |
524 | { "tty", &tty_ops }, | |
525 | #else | |
526 | { "tty", ¬_configged_ops }, | |
527 | #endif | |
528 | ||
529 | #ifdef CONFIG_XTERM_CHAN | |
530 | { "xterm", &xterm_ops }, | |
531 | #else | |
532 | { "xterm", ¬_configged_ops }, | |
533 | #endif | |
534 | }; | |
535 | ||
165dc591 JD |
536 | static struct chan *parse_chan(struct line *line, char *str, int device, |
537 | struct chan_opts *opts) | |
1da177e4 LT |
538 | { |
539 | struct chan_type *entry; | |
540 | struct chan_ops *ops; | |
541 | struct chan *chan; | |
542 | void *data; | |
543 | int i; | |
544 | ||
545 | ops = NULL; | |
546 | data = NULL; | |
547 | for(i = 0; i < sizeof(chan_table)/sizeof(chan_table[0]); i++){ | |
548 | entry = &chan_table[i]; | |
549 | if(!strncmp(str, entry->key, strlen(entry->key))){ | |
550 | ops = entry->ops; | |
551 | str += strlen(entry->key); | |
552 | break; | |
553 | } | |
554 | } | |
555 | if(ops == NULL){ | |
fac97ae0 | 556 | my_printf("parse_chan couldn't parse \"%s\"\n", |
1da177e4 | 557 | str); |
d50084a2 | 558 | return NULL; |
1da177e4 | 559 | } |
d50084a2 JD |
560 | if(ops->init == NULL) |
561 | return NULL; | |
1da177e4 | 562 | data = (*ops->init)(str, device, opts); |
d50084a2 JD |
563 | if(data == NULL) |
564 | return NULL; | |
1da177e4 | 565 | |
79ae2cb8 | 566 | chan = kmalloc(sizeof(*chan), GFP_ATOMIC); |
d50084a2 JD |
567 | if(chan == NULL) |
568 | return NULL; | |
1da177e4 | 569 | *chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list), |
165dc591 JD |
570 | .free_list = |
571 | LIST_HEAD_INIT(chan->free_list), | |
572 | .line = line, | |
1da177e4 LT |
573 | .primary = 1, |
574 | .input = 0, | |
575 | .output = 0, | |
576 | .opened = 0, | |
165dc591 | 577 | .enabled = 0, |
1da177e4 | 578 | .fd = -1, |
1da177e4 LT |
579 | .ops = ops, |
580 | .data = data }); | |
d50084a2 | 581 | return chan; |
1da177e4 LT |
582 | } |
583 | ||
165dc591 | 584 | int parse_chan_pair(char *str, struct line *line, int device, |
1da177e4 LT |
585 | struct chan_opts *opts) |
586 | { | |
165dc591 | 587 | struct list_head *chans = &line->chan_list; |
1da177e4 LT |
588 | struct chan *new, *chan; |
589 | char *in, *out; | |
590 | ||
591 | if(!list_empty(chans)){ | |
592 | chan = list_entry(chans->next, struct chan, list); | |
165dc591 | 593 | free_chan(chans, 0); |
1da177e4 LT |
594 | INIT_LIST_HEAD(chans); |
595 | } | |
596 | ||
597 | out = strchr(str, ','); | |
598 | if(out != NULL){ | |
599 | in = str; | |
600 | *out = '\0'; | |
601 | out++; | |
165dc591 | 602 | new = parse_chan(line, in, device, opts); |
d50084a2 JD |
603 | if(new == NULL) |
604 | return -1; | |
605 | ||
1da177e4 LT |
606 | new->input = 1; |
607 | list_add(&new->list, chans); | |
608 | ||
165dc591 | 609 | new = parse_chan(line, out, device, opts); |
d50084a2 JD |
610 | if(new == NULL) |
611 | return -1; | |
612 | ||
1da177e4 LT |
613 | list_add(&new->list, chans); |
614 | new->output = 1; | |
615 | } | |
616 | else { | |
165dc591 | 617 | new = parse_chan(line, str, device, opts); |
d50084a2 JD |
618 | if(new == NULL) |
619 | return -1; | |
620 | ||
1da177e4 LT |
621 | list_add(&new->list, chans); |
622 | new->input = 1; | |
623 | new->output = 1; | |
624 | } | |
d50084a2 | 625 | return 0; |
1da177e4 LT |
626 | } |
627 | ||
628 | int chan_out_fd(struct list_head *chans) | |
629 | { | |
630 | struct list_head *ele; | |
631 | struct chan *chan; | |
632 | ||
633 | list_for_each(ele, chans){ | |
634 | chan = list_entry(ele, struct chan, list); | |
635 | if(chan->primary && chan->output) | |
d50084a2 | 636 | return chan->fd; |
1da177e4 | 637 | } |
d50084a2 | 638 | return -1; |
1da177e4 LT |
639 | } |
640 | ||
641 | void chan_interrupt(struct list_head *chans, struct work_struct *task, | |
642 | struct tty_struct *tty, int irq) | |
643 | { | |
644 | struct list_head *ele, *next; | |
645 | struct chan *chan; | |
646 | int err; | |
647 | char c; | |
648 | ||
649 | list_for_each_safe(ele, next, chans){ | |
650 | chan = list_entry(ele, struct chan, list); | |
651 | if(!chan->input || (chan->ops->read == NULL)) continue; | |
652 | do { | |
33f0f88f | 653 | if (tty && !tty_buffer_request_room(tty, 1)) { |
9159c9df | 654 | schedule_delayed_work(task, 1); |
1da177e4 LT |
655 | goto out; |
656 | } | |
657 | err = chan->ops->read(chan->fd, &c, chan->data); | |
658 | if(err > 0) | |
659 | tty_receive_char(tty, c); | |
660 | } while(err > 0); | |
661 | ||
662 | if(err == 0) reactivate_fd(chan->fd, irq); | |
663 | if(err == -EIO){ | |
664 | if(chan->primary){ | |
665 | if(tty != NULL) | |
666 | tty_hangup(tty); | |
165dc591 | 667 | close_chan(chans, 1); |
1da177e4 LT |
668 | return; |
669 | } | |
165dc591 | 670 | else close_one_chan(chan, 1); |
1da177e4 LT |
671 | } |
672 | } | |
673 | out: | |
674 | if(tty) tty_flip_buffer_push(tty); | |
675 | } |