Commit | Line | Data |
---|---|---|
165dc591 | 1 | /* |
e99525f9 | 2 | * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com) |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
1da177e4 LT |
6 | #include <linux/slab.h> |
7 | #include <linux/tty.h> | |
1da177e4 | 8 | #include <linux/tty_flip.h> |
510c72a3 | 9 | #include "chan.h" |
37185b33 AV |
10 | #include <os.h> |
11 | #include <irq_kern.h> | |
1da177e4 | 12 | |
fac97ae0 | 13 | #ifdef CONFIG_NOCONFIG_CHAN |
f28169d2 JD |
14 | static void *not_configged_init(char *str, int device, |
15 | const struct chan_opts *opts) | |
fac97ae0 | 16 | { |
e99525f9 | 17 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 | 18 | "UML\n"); |
d50084a2 | 19 | return NULL; |
1da177e4 LT |
20 | } |
21 | ||
22 | static int not_configged_open(int input, int output, int primary, void *data, | |
23 | char **dev_out) | |
24 | { | |
e99525f9 | 25 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 | 26 | "UML\n"); |
d50084a2 | 27 | return -ENODEV; |
1da177e4 LT |
28 | } |
29 | ||
30 | static void not_configged_close(int fd, void *data) | |
31 | { | |
e99525f9 | 32 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 LT |
33 | "UML\n"); |
34 | } | |
35 | ||
36 | static int not_configged_read(int fd, char *c_out, void *data) | |
37 | { | |
e99525f9 | 38 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 | 39 | "UML\n"); |
d50084a2 | 40 | return -EIO; |
1da177e4 LT |
41 | } |
42 | ||
43 | static int not_configged_write(int fd, const char *buf, int len, void *data) | |
44 | { | |
e99525f9 | 45 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 | 46 | "UML\n"); |
d50084a2 | 47 | return -EIO; |
1da177e4 LT |
48 | } |
49 | ||
55c033c1 | 50 | static int not_configged_console_write(int fd, const char *buf, int len) |
1da177e4 | 51 | { |
e99525f9 | 52 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 | 53 | "UML\n"); |
d50084a2 | 54 | return -EIO; |
1da177e4 LT |
55 | } |
56 | ||
57 | static int not_configged_window_size(int fd, void *data, unsigned short *rows, | |
58 | unsigned short *cols) | |
59 | { | |
e99525f9 | 60 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 | 61 | "UML\n"); |
d50084a2 | 62 | return -ENODEV; |
1da177e4 LT |
63 | } |
64 | ||
65 | static void not_configged_free(void *data) | |
66 | { | |
e99525f9 | 67 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 LT |
68 | "UML\n"); |
69 | } | |
70 | ||
5e7672ec | 71 | static const struct chan_ops not_configged_ops = { |
1da177e4 LT |
72 | .init = not_configged_init, |
73 | .open = not_configged_open, | |
74 | .close = not_configged_close, | |
75 | .read = not_configged_read, | |
76 | .write = not_configged_write, | |
77 | .console_write = not_configged_console_write, | |
78 | .window_size = not_configged_window_size, | |
79 | .free = not_configged_free, | |
80 | .winch = 0, | |
81 | }; | |
82 | #endif /* CONFIG_NOCONFIG_CHAN */ | |
83 | ||
1da177e4 LT |
84 | static void tty_receive_char(struct tty_struct *tty, char ch) |
85 | { | |
d2ffc740 JS |
86 | if (tty) |
87 | tty_insert_flip_char(tty, ch, TTY_NORMAL); | |
1da177e4 LT |
88 | } |
89 | ||
d50084a2 | 90 | static int open_one_chan(struct chan *chan) |
1da177e4 | 91 | { |
6676ae62 | 92 | int fd, err; |
1da177e4 | 93 | |
e99525f9 | 94 | if (chan->opened) |
d50084a2 JD |
95 | return 0; |
96 | ||
e99525f9 | 97 | if (chan->ops->open == NULL) |
d50084a2 JD |
98 | fd = 0; |
99 | else fd = (*chan->ops->open)(chan->input, chan->output, chan->primary, | |
100 | chan->data, &chan->dev); | |
e99525f9 | 101 | if (fd < 0) |
d50084a2 | 102 | return fd; |
6676ae62 JD |
103 | |
104 | err = os_set_fd_block(fd, 0); | |
105 | if (err) { | |
106 | (*chan->ops->close)(fd, chan->data); | |
107 | return err; | |
108 | } | |
109 | ||
1da177e4 LT |
110 | chan->fd = fd; |
111 | ||
112 | chan->opened = 1; | |
d50084a2 | 113 | return 0; |
1da177e4 LT |
114 | } |
115 | ||
3af7cb7b | 116 | static int open_chan(struct list_head *chans) |
1da177e4 LT |
117 | { |
118 | struct list_head *ele; | |
119 | struct chan *chan; | |
120 | int ret, err = 0; | |
121 | ||
e99525f9 | 122 | list_for_each(ele, chans) { |
1da177e4 | 123 | chan = list_entry(ele, struct chan, list); |
d50084a2 | 124 | ret = open_one_chan(chan); |
e99525f9 | 125 | if (chan->primary) |
d50084a2 | 126 | err = ret; |
1da177e4 | 127 | } |
d50084a2 | 128 | return err; |
1da177e4 LT |
129 | } |
130 | ||
bed5e39c | 131 | void chan_enable_winch(struct chan *chan, struct tty_struct *tty) |
1da177e4 | 132 | { |
bed5e39c AV |
133 | if (chan && chan->primary && chan->ops->winch) |
134 | register_winch(chan->fd, tty); | |
1da177e4 LT |
135 | } |
136 | ||
0fcd7199 AV |
137 | static void line_timer_cb(struct work_struct *work) |
138 | { | |
139 | struct line *line = container_of(work, struct line, task.work); | |
6fc58845 | 140 | struct tty_struct *tty = tty_port_tty_get(&line->port); |
0fcd7199 AV |
141 | |
142 | if (!line->throttled) | |
6fc58845 JS |
143 | chan_interrupt(line, tty, line->driver->read_irq); |
144 | tty_kref_put(tty); | |
0fcd7199 AV |
145 | } |
146 | ||
d14ad81f | 147 | int enable_chan(struct line *line) |
1da177e4 LT |
148 | { |
149 | struct list_head *ele; | |
150 | struct chan *chan; | |
d14ad81f | 151 | int err; |
1da177e4 | 152 | |
0fcd7199 AV |
153 | INIT_DELAYED_WORK(&line->task, line_timer_cb); |
154 | ||
e99525f9 | 155 | list_for_each(ele, &line->chan_list) { |
1da177e4 | 156 | chan = list_entry(ele, struct chan, list); |
d14ad81f JD |
157 | err = open_one_chan(chan); |
158 | if (err) { | |
159 | if (chan->primary) | |
160 | goto out_close; | |
161 | ||
165dc591 | 162 | continue; |
d14ad81f | 163 | } |
165dc591 | 164 | |
e99525f9 | 165 | if (chan->enabled) |
165dc591 | 166 | continue; |
d14ad81f JD |
167 | err = line_setup_irq(chan->fd, chan->input, chan->output, line, |
168 | chan); | |
169 | if (err) | |
170 | goto out_close; | |
171 | ||
165dc591 JD |
172 | chan->enabled = 1; |
173 | } | |
d14ad81f JD |
174 | |
175 | return 0; | |
176 | ||
177 | out_close: | |
10c890c0 | 178 | close_chan(line); |
d14ad81f | 179 | return err; |
165dc591 JD |
180 | } |
181 | ||
190c3e45 JD |
182 | /* Items are added in IRQ context, when free_irq can't be called, and |
183 | * removed in process context, when it can. | |
184 | * This handles interrupt sources which disappear, and which need to | |
185 | * be permanently disabled. This is discovered in IRQ context, but | |
186 | * the freeing of the IRQ must be done later. | |
187 | */ | |
188 | static DEFINE_SPINLOCK(irqs_to_free_lock); | |
165dc591 JD |
189 | static LIST_HEAD(irqs_to_free); |
190 | ||
191 | void free_irqs(void) | |
192 | { | |
193 | struct chan *chan; | |
190c3e45 JD |
194 | LIST_HEAD(list); |
195 | struct list_head *ele; | |
3076212f | 196 | unsigned long flags; |
190c3e45 | 197 | |
3076212f | 198 | spin_lock_irqsave(&irqs_to_free_lock, flags); |
190c3e45 | 199 | list_splice_init(&irqs_to_free, &list); |
3076212f | 200 | spin_unlock_irqrestore(&irqs_to_free_lock, flags); |
165dc591 | 201 | |
e99525f9 | 202 | list_for_each(ele, &list) { |
190c3e45 | 203 | chan = list_entry(ele, struct chan, free_list); |
165dc591 | 204 | |
47562277 | 205 | if (chan->input && chan->enabled) |
fa7a0449 | 206 | um_free_irq(chan->line->driver->read_irq, chan); |
47562277 | 207 | if (chan->output && chan->enabled) |
fa7a0449 | 208 | um_free_irq(chan->line->driver->write_irq, chan); |
165dc591 JD |
209 | chan->enabled = 0; |
210 | } | |
211 | } | |
212 | ||
213 | static void close_one_chan(struct chan *chan, int delay_free_irq) | |
214 | { | |
3076212f JD |
215 | unsigned long flags; |
216 | ||
e99525f9 | 217 | if (!chan->opened) |
165dc591 | 218 | return; |
1da177e4 | 219 | |
e99525f9 | 220 | if (delay_free_irq) { |
3076212f | 221 | spin_lock_irqsave(&irqs_to_free_lock, flags); |
165dc591 | 222 | list_add(&chan->free_list, &irqs_to_free); |
3076212f | 223 | spin_unlock_irqrestore(&irqs_to_free_lock, flags); |
165dc591 JD |
224 | } |
225 | else { | |
47562277 | 226 | if (chan->input && chan->enabled) |
fa7a0449 | 227 | um_free_irq(chan->line->driver->read_irq, chan); |
47562277 | 228 | if (chan->output && chan->enabled) |
fa7a0449 | 229 | um_free_irq(chan->line->driver->write_irq, chan); |
165dc591 | 230 | chan->enabled = 0; |
1da177e4 | 231 | } |
e99525f9 | 232 | if (chan->ops->close != NULL) |
165dc591 JD |
233 | (*chan->ops->close)(chan->fd, chan->data); |
234 | ||
235 | chan->opened = 0; | |
236 | chan->fd = -1; | |
1da177e4 LT |
237 | } |
238 | ||
10c890c0 | 239 | void close_chan(struct line *line) |
1da177e4 LT |
240 | { |
241 | struct chan *chan; | |
242 | ||
243 | /* Close in reverse order as open in case more than one of them | |
244 | * refers to the same device and they save and restore that device's | |
245 | * state. Then, the first one opened will have the original state, | |
246 | * so it must be the last closed. | |
247 | */ | |
10c890c0 AV |
248 | list_for_each_entry_reverse(chan, &line->chan_list, list) { |
249 | close_one_chan(chan, 0); | |
1da177e4 LT |
250 | } |
251 | } | |
252 | ||
bed5e39c | 253 | void deactivate_chan(struct chan *chan, int irq) |
e4dcee80 | 254 | { |
bed5e39c AV |
255 | if (chan && chan->enabled) |
256 | deactivate_fd(chan->fd, irq); | |
e4dcee80 JD |
257 | } |
258 | ||
bed5e39c | 259 | void reactivate_chan(struct chan *chan, int irq) |
e4dcee80 | 260 | { |
bed5e39c AV |
261 | if (chan && chan->enabled) |
262 | reactivate_fd(chan->fd, irq); | |
e4dcee80 JD |
263 | } |
264 | ||
bed5e39c | 265 | int write_chan(struct chan *chan, const char *buf, int len, |
1da177e4 LT |
266 | int write_irq) |
267 | { | |
1da177e4 LT |
268 | int n, ret = 0; |
269 | ||
bed5e39c | 270 | if (len == 0 || !chan || !chan->ops->write) |
c59dbcad JD |
271 | return 0; |
272 | ||
bed5e39c AV |
273 | n = chan->ops->write(chan->fd, buf, len, chan->data); |
274 | if (chan->primary) { | |
275 | ret = n; | |
276 | if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len))) | |
277 | reactivate_fd(chan->fd, write_irq); | |
1da177e4 | 278 | } |
d50084a2 | 279 | return ret; |
1da177e4 LT |
280 | } |
281 | ||
bed5e39c | 282 | int console_write_chan(struct chan *chan, const char *buf, int len) |
1da177e4 | 283 | { |
1da177e4 LT |
284 | int n, ret = 0; |
285 | ||
bed5e39c AV |
286 | if (!chan || !chan->ops->console_write) |
287 | return 0; | |
e99525f9 | 288 | |
bed5e39c AV |
289 | n = chan->ops->console_write(chan->fd, buf, len); |
290 | if (chan->primary) | |
291 | ret = n; | |
d50084a2 | 292 | return ret; |
1da177e4 LT |
293 | } |
294 | ||
a52f362f | 295 | int console_open_chan(struct line *line, struct console *co) |
1da177e4 | 296 | { |
1f80171e JD |
297 | int err; |
298 | ||
299 | err = open_chan(&line->chan_list); | |
e99525f9 | 300 | if (err) |
1f80171e | 301 | return err; |
1da177e4 | 302 | |
e99525f9 JD |
303 | printk(KERN_INFO "Console initialized on /dev/%s%d\n", co->name, |
304 | co->index); | |
1da177e4 LT |
305 | return 0; |
306 | } | |
307 | ||
bed5e39c | 308 | int chan_window_size(struct line *line, unsigned short *rows_out, |
1da177e4 LT |
309 | unsigned short *cols_out) |
310 | { | |
1da177e4 LT |
311 | struct chan *chan; |
312 | ||
bed5e39c AV |
313 | chan = line->chan_in; |
314 | if (chan && chan->primary) { | |
315 | if (chan->ops->window_size == NULL) | |
316 | return 0; | |
317 | return chan->ops->window_size(chan->fd, chan->data, | |
318 | rows_out, cols_out); | |
319 | } | |
320 | chan = line->chan_out; | |
321 | if (chan && chan->primary) { | |
322 | if (chan->ops->window_size == NULL) | |
323 | return 0; | |
324 | return chan->ops->window_size(chan->fd, chan->data, | |
325 | rows_out, cols_out); | |
1da177e4 | 326 | } |
d50084a2 | 327 | return 0; |
1da177e4 LT |
328 | } |
329 | ||
772bd0a5 | 330 | static void free_one_chan(struct chan *chan) |
1da177e4 LT |
331 | { |
332 | list_del(&chan->list); | |
165dc591 | 333 | |
772bd0a5 | 334 | close_one_chan(chan, 0); |
165dc591 | 335 | |
e99525f9 | 336 | if (chan->ops->free != NULL) |
1da177e4 | 337 | (*chan->ops->free)(chan->data); |
165dc591 | 338 | |
e99525f9 JD |
339 | if (chan->primary && chan->output) |
340 | ignore_sigio_fd(chan->fd); | |
1da177e4 LT |
341 | kfree(chan); |
342 | } | |
343 | ||
772bd0a5 | 344 | static void free_chan(struct list_head *chans) |
1da177e4 LT |
345 | { |
346 | struct list_head *ele, *next; | |
347 | struct chan *chan; | |
348 | ||
e99525f9 | 349 | list_for_each_safe(ele, next, chans) { |
1da177e4 | 350 | chan = list_entry(ele, struct chan, list); |
772bd0a5 | 351 | free_one_chan(chan); |
1da177e4 LT |
352 | } |
353 | } | |
354 | ||
355 | static int one_chan_config_string(struct chan *chan, char *str, int size, | |
356 | char **error_out) | |
357 | { | |
358 | int n = 0; | |
359 | ||
e99525f9 | 360 | if (chan == NULL) { |
1da177e4 | 361 | CONFIG_CHUNK(str, size, n, "none", 1); |
d50084a2 | 362 | return n; |
1da177e4 LT |
363 | } |
364 | ||
365 | CONFIG_CHUNK(str, size, n, chan->ops->type, 0); | |
366 | ||
e99525f9 | 367 | if (chan->dev == NULL) { |
1da177e4 | 368 | CONFIG_CHUNK(str, size, n, "", 1); |
d50084a2 | 369 | return n; |
1da177e4 LT |
370 | } |
371 | ||
372 | CONFIG_CHUNK(str, size, n, ":", 0); | |
373 | CONFIG_CHUNK(str, size, n, chan->dev, 0); | |
374 | ||
d50084a2 | 375 | return n; |
1da177e4 LT |
376 | } |
377 | ||
d50084a2 | 378 | static int chan_pair_config_string(struct chan *in, struct chan *out, |
1da177e4 LT |
379 | char *str, int size, char **error_out) |
380 | { | |
381 | int n; | |
382 | ||
383 | n = one_chan_config_string(in, str, size, error_out); | |
384 | str += n; | |
385 | size -= n; | |
386 | ||
e99525f9 | 387 | if (in == out) { |
1da177e4 | 388 | CONFIG_CHUNK(str, size, n, "", 1); |
d50084a2 | 389 | return n; |
1da177e4 LT |
390 | } |
391 | ||
392 | CONFIG_CHUNK(str, size, n, ",", 1); | |
393 | n = one_chan_config_string(out, str, size, error_out); | |
394 | str += n; | |
395 | size -= n; | |
396 | CONFIG_CHUNK(str, size, n, "", 1); | |
397 | ||
d50084a2 | 398 | return n; |
1da177e4 LT |
399 | } |
400 | ||
bed5e39c | 401 | int chan_config_string(struct line *line, char *str, int size, |
1da177e4 LT |
402 | char **error_out) |
403 | { | |
bed5e39c | 404 | struct chan *in = line->chan_in, *out = line->chan_out; |
1da177e4 | 405 | |
bed5e39c AV |
406 | if (in && !in->primary) |
407 | in = NULL; | |
408 | if (out && !out->primary) | |
409 | out = NULL; | |
1da177e4 | 410 | |
d50084a2 | 411 | return chan_pair_config_string(in, out, str, size, error_out); |
1da177e4 LT |
412 | } |
413 | ||
414 | struct chan_type { | |
415 | char *key; | |
5e7672ec | 416 | const struct chan_ops *ops; |
1da177e4 LT |
417 | }; |
418 | ||
5e7672ec | 419 | static const struct chan_type chan_table[] = { |
1da177e4 LT |
420 | { "fd", &fd_ops }, |
421 | ||
422 | #ifdef CONFIG_NULL_CHAN | |
423 | { "null", &null_ops }, | |
424 | #else | |
425 | { "null", ¬_configged_ops }, | |
426 | #endif | |
427 | ||
428 | #ifdef CONFIG_PORT_CHAN | |
429 | { "port", &port_ops }, | |
430 | #else | |
431 | { "port", ¬_configged_ops }, | |
432 | #endif | |
433 | ||
434 | #ifdef CONFIG_PTY_CHAN | |
435 | { "pty", &pty_ops }, | |
436 | { "pts", &pts_ops }, | |
437 | #else | |
438 | { "pty", ¬_configged_ops }, | |
439 | { "pts", ¬_configged_ops }, | |
440 | #endif | |
441 | ||
442 | #ifdef CONFIG_TTY_CHAN | |
443 | { "tty", &tty_ops }, | |
444 | #else | |
445 | { "tty", ¬_configged_ops }, | |
446 | #endif | |
447 | ||
448 | #ifdef CONFIG_XTERM_CHAN | |
449 | { "xterm", &xterm_ops }, | |
450 | #else | |
451 | { "xterm", ¬_configged_ops }, | |
452 | #endif | |
453 | }; | |
454 | ||
165dc591 | 455 | static struct chan *parse_chan(struct line *line, char *str, int device, |
f28169d2 | 456 | const struct chan_opts *opts, char **error_out) |
1da177e4 | 457 | { |
5e7672ec JD |
458 | const struct chan_type *entry; |
459 | const struct chan_ops *ops; | |
1da177e4 LT |
460 | struct chan *chan; |
461 | void *data; | |
462 | int i; | |
463 | ||
464 | ops = NULL; | |
465 | data = NULL; | |
e99525f9 | 466 | for(i = 0; i < ARRAY_SIZE(chan_table); i++) { |
1da177e4 | 467 | entry = &chan_table[i]; |
e99525f9 | 468 | if (!strncmp(str, entry->key, strlen(entry->key))) { |
1da177e4 LT |
469 | ops = entry->ops; |
470 | str += strlen(entry->key); | |
471 | break; | |
472 | } | |
473 | } | |
e99525f9 | 474 | if (ops == NULL) { |
f28169d2 | 475 | *error_out = "No match for configured backends"; |
d50084a2 | 476 | return NULL; |
1da177e4 | 477 | } |
f28169d2 | 478 | |
1da177e4 | 479 | data = (*ops->init)(str, device, opts); |
e99525f9 | 480 | if (data == NULL) { |
f28169d2 | 481 | *error_out = "Configuration failed"; |
d50084a2 | 482 | return NULL; |
f28169d2 | 483 | } |
1da177e4 | 484 | |
79ae2cb8 | 485 | chan = kmalloc(sizeof(*chan), GFP_ATOMIC); |
e99525f9 | 486 | if (chan == NULL) { |
f28169d2 | 487 | *error_out = "Memory allocation failed"; |
d50084a2 | 488 | return NULL; |
f28169d2 | 489 | } |
1da177e4 | 490 | *chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list), |
165dc591 JD |
491 | .free_list = |
492 | LIST_HEAD_INIT(chan->free_list), | |
493 | .line = line, | |
1da177e4 LT |
494 | .primary = 1, |
495 | .input = 0, | |
496 | .output = 0, | |
497 | .opened = 0, | |
165dc591 | 498 | .enabled = 0, |
1da177e4 | 499 | .fd = -1, |
1da177e4 LT |
500 | .ops = ops, |
501 | .data = data }); | |
d50084a2 | 502 | return chan; |
1da177e4 LT |
503 | } |
504 | ||
165dc591 | 505 | int parse_chan_pair(char *str, struct line *line, int device, |
f28169d2 | 506 | const struct chan_opts *opts, char **error_out) |
1da177e4 | 507 | { |
165dc591 | 508 | struct list_head *chans = &line->chan_list; |
f1c93e49 | 509 | struct chan *new; |
1da177e4 LT |
510 | char *in, *out; |
511 | ||
e99525f9 | 512 | if (!list_empty(chans)) { |
ee485070 | 513 | line->chan_in = line->chan_out = NULL; |
772bd0a5 | 514 | free_chan(chans); |
1da177e4 LT |
515 | INIT_LIST_HEAD(chans); |
516 | } | |
517 | ||
31efcebb AV |
518 | if (!str) |
519 | return 0; | |
520 | ||
1da177e4 | 521 | out = strchr(str, ','); |
e99525f9 | 522 | if (out != NULL) { |
1da177e4 LT |
523 | in = str; |
524 | *out = '\0'; | |
525 | out++; | |
f28169d2 | 526 | new = parse_chan(line, in, device, opts, error_out); |
e99525f9 | 527 | if (new == NULL) |
d50084a2 JD |
528 | return -1; |
529 | ||
1da177e4 LT |
530 | new->input = 1; |
531 | list_add(&new->list, chans); | |
ee485070 | 532 | line->chan_in = new; |
1da177e4 | 533 | |
f28169d2 | 534 | new = parse_chan(line, out, device, opts, error_out); |
e99525f9 | 535 | if (new == NULL) |
d50084a2 JD |
536 | return -1; |
537 | ||
1da177e4 LT |
538 | list_add(&new->list, chans); |
539 | new->output = 1; | |
ee485070 | 540 | line->chan_out = new; |
1da177e4 LT |
541 | } |
542 | else { | |
f28169d2 | 543 | new = parse_chan(line, str, device, opts, error_out); |
e99525f9 | 544 | if (new == NULL) |
d50084a2 JD |
545 | return -1; |
546 | ||
1da177e4 LT |
547 | list_add(&new->list, chans); |
548 | new->input = 1; | |
549 | new->output = 1; | |
ee485070 | 550 | line->chan_in = line->chan_out = new; |
1da177e4 | 551 | } |
d50084a2 | 552 | return 0; |
1da177e4 LT |
553 | } |
554 | ||
0fcd7199 | 555 | void chan_interrupt(struct line *line, struct tty_struct *tty, int irq) |
1da177e4 | 556 | { |
bed5e39c | 557 | struct chan *chan = line->chan_in; |
1da177e4 LT |
558 | int err; |
559 | char c; | |
560 | ||
bed5e39c AV |
561 | if (!chan || !chan->ops->read) |
562 | goto out; | |
563 | ||
564 | do { | |
565 | if (tty && !tty_buffer_request_room(tty, 1)) { | |
0fcd7199 | 566 | schedule_delayed_work(&line->task, 1); |
bed5e39c AV |
567 | goto out; |
568 | } | |
569 | err = chan->ops->read(chan->fd, &c, chan->data); | |
570 | if (err > 0) | |
571 | tty_receive_char(tty, c); | |
572 | } while (err > 0); | |
573 | ||
574 | if (err == 0) | |
575 | reactivate_fd(chan->fd, irq); | |
576 | if (err == -EIO) { | |
577 | if (chan->primary) { | |
578 | if (tty != NULL) | |
579 | tty_hangup(tty); | |
10c890c0 AV |
580 | if (line->chan_out != chan) |
581 | close_one_chan(line->chan_out, 1); | |
1da177e4 | 582 | } |
10c890c0 AV |
583 | close_one_chan(chan, 1); |
584 | if (chan->primary) | |
585 | return; | |
1da177e4 LT |
586 | } |
587 | out: | |
e99525f9 JD |
588 | if (tty) |
589 | tty_flip_buffer_push(tty); | |
1da177e4 | 590 | } |