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 | ||
d50084a2 | 84 | static int open_one_chan(struct chan *chan) |
1da177e4 | 85 | { |
6676ae62 | 86 | int fd, err; |
1da177e4 | 87 | |
e99525f9 | 88 | if (chan->opened) |
d50084a2 JD |
89 | return 0; |
90 | ||
e99525f9 | 91 | if (chan->ops->open == NULL) |
d50084a2 JD |
92 | fd = 0; |
93 | else fd = (*chan->ops->open)(chan->input, chan->output, chan->primary, | |
94 | chan->data, &chan->dev); | |
e99525f9 | 95 | if (fd < 0) |
d50084a2 | 96 | return fd; |
6676ae62 JD |
97 | |
98 | err = os_set_fd_block(fd, 0); | |
99 | if (err) { | |
100 | (*chan->ops->close)(fd, chan->data); | |
101 | return err; | |
102 | } | |
103 | ||
1da177e4 LT |
104 | chan->fd = fd; |
105 | ||
106 | chan->opened = 1; | |
d50084a2 | 107 | return 0; |
1da177e4 LT |
108 | } |
109 | ||
3af7cb7b | 110 | static int open_chan(struct list_head *chans) |
1da177e4 LT |
111 | { |
112 | struct list_head *ele; | |
113 | struct chan *chan; | |
114 | int ret, err = 0; | |
115 | ||
e99525f9 | 116 | list_for_each(ele, chans) { |
1da177e4 | 117 | chan = list_entry(ele, struct chan, list); |
d50084a2 | 118 | ret = open_one_chan(chan); |
e99525f9 | 119 | if (chan->primary) |
d50084a2 | 120 | err = ret; |
1da177e4 | 121 | } |
d50084a2 | 122 | return err; |
1da177e4 LT |
123 | } |
124 | ||
2116bda6 | 125 | void chan_enable_winch(struct chan *chan, struct tty_port *port) |
1da177e4 | 126 | { |
bed5e39c | 127 | if (chan && chan->primary && chan->ops->winch) |
2116bda6 | 128 | register_winch(chan->fd, port); |
1da177e4 LT |
129 | } |
130 | ||
0fcd7199 AV |
131 | static void line_timer_cb(struct work_struct *work) |
132 | { | |
133 | struct line *line = container_of(work, struct line, task.work); | |
134 | ||
135 | if (!line->throttled) | |
2e124b4a | 136 | chan_interrupt(line, line->driver->read_irq); |
0fcd7199 AV |
137 | } |
138 | ||
d14ad81f | 139 | int enable_chan(struct line *line) |
1da177e4 LT |
140 | { |
141 | struct list_head *ele; | |
142 | struct chan *chan; | |
d14ad81f | 143 | int err; |
1da177e4 | 144 | |
0fcd7199 AV |
145 | INIT_DELAYED_WORK(&line->task, line_timer_cb); |
146 | ||
e99525f9 | 147 | list_for_each(ele, &line->chan_list) { |
1da177e4 | 148 | chan = list_entry(ele, struct chan, list); |
d14ad81f JD |
149 | err = open_one_chan(chan); |
150 | if (err) { | |
151 | if (chan->primary) | |
152 | goto out_close; | |
153 | ||
165dc591 | 154 | continue; |
d14ad81f | 155 | } |
165dc591 | 156 | |
e99525f9 | 157 | if (chan->enabled) |
165dc591 | 158 | continue; |
d14ad81f JD |
159 | err = line_setup_irq(chan->fd, chan->input, chan->output, line, |
160 | chan); | |
161 | if (err) | |
162 | goto out_close; | |
163 | ||
165dc591 JD |
164 | chan->enabled = 1; |
165 | } | |
d14ad81f JD |
166 | |
167 | return 0; | |
168 | ||
169 | out_close: | |
10c890c0 | 170 | close_chan(line); |
d14ad81f | 171 | return err; |
165dc591 JD |
172 | } |
173 | ||
165dc591 JD |
174 | static void close_one_chan(struct chan *chan, int delay_free_irq) |
175 | { | |
e99525f9 | 176 | if (!chan->opened) |
165dc591 | 177 | return; |
1da177e4 | 178 | |
ff6a1798 AI |
179 | /* we can safely call free now - it will be marked |
180 | * as free and freed once the IRQ stopped processing | |
181 | */ | |
182 | if (chan->input && chan->enabled) | |
183 | um_free_irq(chan->line->driver->read_irq, chan); | |
184 | if (chan->output && chan->enabled) | |
185 | um_free_irq(chan->line->driver->write_irq, chan); | |
186 | chan->enabled = 0; | |
e99525f9 | 187 | if (chan->ops->close != NULL) |
165dc591 JD |
188 | (*chan->ops->close)(chan->fd, chan->data); |
189 | ||
190 | chan->opened = 0; | |
191 | chan->fd = -1; | |
1da177e4 LT |
192 | } |
193 | ||
10c890c0 | 194 | void close_chan(struct line *line) |
1da177e4 LT |
195 | { |
196 | struct chan *chan; | |
197 | ||
198 | /* Close in reverse order as open in case more than one of them | |
199 | * refers to the same device and they save and restore that device's | |
200 | * state. Then, the first one opened will have the original state, | |
201 | * so it must be the last closed. | |
202 | */ | |
10c890c0 AV |
203 | list_for_each_entry_reverse(chan, &line->chan_list, list) { |
204 | close_one_chan(chan, 0); | |
1da177e4 LT |
205 | } |
206 | } | |
207 | ||
bed5e39c | 208 | void deactivate_chan(struct chan *chan, int irq) |
e4dcee80 | 209 | { |
bed5e39c AV |
210 | if (chan && chan->enabled) |
211 | deactivate_fd(chan->fd, irq); | |
e4dcee80 JD |
212 | } |
213 | ||
bed5e39c | 214 | void reactivate_chan(struct chan *chan, int irq) |
e4dcee80 | 215 | { |
bed5e39c AV |
216 | if (chan && chan->enabled) |
217 | reactivate_fd(chan->fd, irq); | |
e4dcee80 JD |
218 | } |
219 | ||
bed5e39c | 220 | int write_chan(struct chan *chan, const char *buf, int len, |
1da177e4 LT |
221 | int write_irq) |
222 | { | |
1da177e4 LT |
223 | int n, ret = 0; |
224 | ||
bed5e39c | 225 | if (len == 0 || !chan || !chan->ops->write) |
c59dbcad JD |
226 | return 0; |
227 | ||
bed5e39c AV |
228 | n = chan->ops->write(chan->fd, buf, len, chan->data); |
229 | if (chan->primary) { | |
230 | ret = n; | |
231 | if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len))) | |
232 | reactivate_fd(chan->fd, write_irq); | |
1da177e4 | 233 | } |
d50084a2 | 234 | return ret; |
1da177e4 LT |
235 | } |
236 | ||
bed5e39c | 237 | int console_write_chan(struct chan *chan, const char *buf, int len) |
1da177e4 | 238 | { |
1da177e4 LT |
239 | int n, ret = 0; |
240 | ||
bed5e39c AV |
241 | if (!chan || !chan->ops->console_write) |
242 | return 0; | |
e99525f9 | 243 | |
bed5e39c AV |
244 | n = chan->ops->console_write(chan->fd, buf, len); |
245 | if (chan->primary) | |
246 | ret = n; | |
d50084a2 | 247 | return ret; |
1da177e4 LT |
248 | } |
249 | ||
a52f362f | 250 | int console_open_chan(struct line *line, struct console *co) |
1da177e4 | 251 | { |
1f80171e JD |
252 | int err; |
253 | ||
254 | err = open_chan(&line->chan_list); | |
e99525f9 | 255 | if (err) |
1f80171e | 256 | return err; |
1da177e4 | 257 | |
e99525f9 JD |
258 | printk(KERN_INFO "Console initialized on /dev/%s%d\n", co->name, |
259 | co->index); | |
1da177e4 LT |
260 | return 0; |
261 | } | |
262 | ||
bed5e39c | 263 | int chan_window_size(struct line *line, unsigned short *rows_out, |
1da177e4 LT |
264 | unsigned short *cols_out) |
265 | { | |
1da177e4 LT |
266 | struct chan *chan; |
267 | ||
bed5e39c AV |
268 | chan = line->chan_in; |
269 | if (chan && chan->primary) { | |
270 | if (chan->ops->window_size == NULL) | |
271 | return 0; | |
272 | return chan->ops->window_size(chan->fd, chan->data, | |
273 | rows_out, cols_out); | |
274 | } | |
275 | chan = line->chan_out; | |
276 | if (chan && chan->primary) { | |
277 | if (chan->ops->window_size == NULL) | |
278 | return 0; | |
279 | return chan->ops->window_size(chan->fd, chan->data, | |
280 | rows_out, cols_out); | |
1da177e4 | 281 | } |
d50084a2 | 282 | return 0; |
1da177e4 LT |
283 | } |
284 | ||
772bd0a5 | 285 | static void free_one_chan(struct chan *chan) |
1da177e4 LT |
286 | { |
287 | list_del(&chan->list); | |
165dc591 | 288 | |
772bd0a5 | 289 | close_one_chan(chan, 0); |
165dc591 | 290 | |
e99525f9 | 291 | if (chan->ops->free != NULL) |
1da177e4 | 292 | (*chan->ops->free)(chan->data); |
165dc591 | 293 | |
e99525f9 JD |
294 | if (chan->primary && chan->output) |
295 | ignore_sigio_fd(chan->fd); | |
1da177e4 LT |
296 | kfree(chan); |
297 | } | |
298 | ||
772bd0a5 | 299 | static void free_chan(struct list_head *chans) |
1da177e4 LT |
300 | { |
301 | struct list_head *ele, *next; | |
302 | struct chan *chan; | |
303 | ||
e99525f9 | 304 | list_for_each_safe(ele, next, chans) { |
1da177e4 | 305 | chan = list_entry(ele, struct chan, list); |
772bd0a5 | 306 | free_one_chan(chan); |
1da177e4 LT |
307 | } |
308 | } | |
309 | ||
310 | static int one_chan_config_string(struct chan *chan, char *str, int size, | |
311 | char **error_out) | |
312 | { | |
313 | int n = 0; | |
314 | ||
e99525f9 | 315 | if (chan == NULL) { |
1da177e4 | 316 | CONFIG_CHUNK(str, size, n, "none", 1); |
d50084a2 | 317 | return n; |
1da177e4 LT |
318 | } |
319 | ||
320 | CONFIG_CHUNK(str, size, n, chan->ops->type, 0); | |
321 | ||
e99525f9 | 322 | if (chan->dev == NULL) { |
1da177e4 | 323 | CONFIG_CHUNK(str, size, n, "", 1); |
d50084a2 | 324 | return n; |
1da177e4 LT |
325 | } |
326 | ||
327 | CONFIG_CHUNK(str, size, n, ":", 0); | |
328 | CONFIG_CHUNK(str, size, n, chan->dev, 0); | |
329 | ||
d50084a2 | 330 | return n; |
1da177e4 LT |
331 | } |
332 | ||
d50084a2 | 333 | static int chan_pair_config_string(struct chan *in, struct chan *out, |
1da177e4 LT |
334 | char *str, int size, char **error_out) |
335 | { | |
336 | int n; | |
337 | ||
338 | n = one_chan_config_string(in, str, size, error_out); | |
339 | str += n; | |
340 | size -= n; | |
341 | ||
e99525f9 | 342 | if (in == out) { |
1da177e4 | 343 | CONFIG_CHUNK(str, size, n, "", 1); |
d50084a2 | 344 | return n; |
1da177e4 LT |
345 | } |
346 | ||
347 | CONFIG_CHUNK(str, size, n, ",", 1); | |
348 | n = one_chan_config_string(out, str, size, error_out); | |
349 | str += n; | |
350 | size -= n; | |
351 | CONFIG_CHUNK(str, size, n, "", 1); | |
352 | ||
d50084a2 | 353 | return n; |
1da177e4 LT |
354 | } |
355 | ||
bed5e39c | 356 | int chan_config_string(struct line *line, char *str, int size, |
1da177e4 LT |
357 | char **error_out) |
358 | { | |
bed5e39c | 359 | struct chan *in = line->chan_in, *out = line->chan_out; |
1da177e4 | 360 | |
bed5e39c AV |
361 | if (in && !in->primary) |
362 | in = NULL; | |
363 | if (out && !out->primary) | |
364 | out = NULL; | |
1da177e4 | 365 | |
d50084a2 | 366 | return chan_pair_config_string(in, out, str, size, error_out); |
1da177e4 LT |
367 | } |
368 | ||
369 | struct chan_type { | |
370 | char *key; | |
5e7672ec | 371 | const struct chan_ops *ops; |
1da177e4 LT |
372 | }; |
373 | ||
5e7672ec | 374 | static const struct chan_type chan_table[] = { |
1da177e4 LT |
375 | { "fd", &fd_ops }, |
376 | ||
377 | #ifdef CONFIG_NULL_CHAN | |
378 | { "null", &null_ops }, | |
379 | #else | |
380 | { "null", ¬_configged_ops }, | |
381 | #endif | |
382 | ||
383 | #ifdef CONFIG_PORT_CHAN | |
384 | { "port", &port_ops }, | |
385 | #else | |
386 | { "port", ¬_configged_ops }, | |
387 | #endif | |
388 | ||
389 | #ifdef CONFIG_PTY_CHAN | |
390 | { "pty", &pty_ops }, | |
391 | { "pts", &pts_ops }, | |
392 | #else | |
393 | { "pty", ¬_configged_ops }, | |
394 | { "pts", ¬_configged_ops }, | |
395 | #endif | |
396 | ||
397 | #ifdef CONFIG_TTY_CHAN | |
398 | { "tty", &tty_ops }, | |
399 | #else | |
400 | { "tty", ¬_configged_ops }, | |
401 | #endif | |
402 | ||
403 | #ifdef CONFIG_XTERM_CHAN | |
404 | { "xterm", &xterm_ops }, | |
405 | #else | |
406 | { "xterm", ¬_configged_ops }, | |
407 | #endif | |
408 | }; | |
409 | ||
165dc591 | 410 | static struct chan *parse_chan(struct line *line, char *str, int device, |
f28169d2 | 411 | const struct chan_opts *opts, char **error_out) |
1da177e4 | 412 | { |
5e7672ec JD |
413 | const struct chan_type *entry; |
414 | const struct chan_ops *ops; | |
1da177e4 LT |
415 | struct chan *chan; |
416 | void *data; | |
417 | int i; | |
418 | ||
419 | ops = NULL; | |
420 | data = NULL; | |
e99525f9 | 421 | for(i = 0; i < ARRAY_SIZE(chan_table); i++) { |
1da177e4 | 422 | entry = &chan_table[i]; |
e99525f9 | 423 | if (!strncmp(str, entry->key, strlen(entry->key))) { |
1da177e4 LT |
424 | ops = entry->ops; |
425 | str += strlen(entry->key); | |
426 | break; | |
427 | } | |
428 | } | |
e99525f9 | 429 | if (ops == NULL) { |
f28169d2 | 430 | *error_out = "No match for configured backends"; |
d50084a2 | 431 | return NULL; |
1da177e4 | 432 | } |
f28169d2 | 433 | |
1da177e4 | 434 | data = (*ops->init)(str, device, opts); |
e99525f9 | 435 | if (data == NULL) { |
f28169d2 | 436 | *error_out = "Configuration failed"; |
d50084a2 | 437 | return NULL; |
f28169d2 | 438 | } |
1da177e4 | 439 | |
79ae2cb8 | 440 | chan = kmalloc(sizeof(*chan), GFP_ATOMIC); |
e99525f9 | 441 | if (chan == NULL) { |
f28169d2 | 442 | *error_out = "Memory allocation failed"; |
d50084a2 | 443 | return NULL; |
f28169d2 | 444 | } |
1da177e4 | 445 | *chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list), |
165dc591 JD |
446 | .free_list = |
447 | LIST_HEAD_INIT(chan->free_list), | |
448 | .line = line, | |
1da177e4 LT |
449 | .primary = 1, |
450 | .input = 0, | |
451 | .output = 0, | |
452 | .opened = 0, | |
165dc591 | 453 | .enabled = 0, |
1da177e4 | 454 | .fd = -1, |
1da177e4 LT |
455 | .ops = ops, |
456 | .data = data }); | |
d50084a2 | 457 | return chan; |
1da177e4 LT |
458 | } |
459 | ||
165dc591 | 460 | int parse_chan_pair(char *str, struct line *line, int device, |
f28169d2 | 461 | const struct chan_opts *opts, char **error_out) |
1da177e4 | 462 | { |
165dc591 | 463 | struct list_head *chans = &line->chan_list; |
f1c93e49 | 464 | struct chan *new; |
1da177e4 LT |
465 | char *in, *out; |
466 | ||
e99525f9 | 467 | if (!list_empty(chans)) { |
ee485070 | 468 | line->chan_in = line->chan_out = NULL; |
772bd0a5 | 469 | free_chan(chans); |
1da177e4 LT |
470 | INIT_LIST_HEAD(chans); |
471 | } | |
472 | ||
31efcebb AV |
473 | if (!str) |
474 | return 0; | |
475 | ||
1da177e4 | 476 | out = strchr(str, ','); |
e99525f9 | 477 | if (out != NULL) { |
1da177e4 LT |
478 | in = str; |
479 | *out = '\0'; | |
480 | out++; | |
f28169d2 | 481 | new = parse_chan(line, in, device, opts, error_out); |
e99525f9 | 482 | if (new == NULL) |
d50084a2 JD |
483 | return -1; |
484 | ||
1da177e4 LT |
485 | new->input = 1; |
486 | list_add(&new->list, chans); | |
ee485070 | 487 | line->chan_in = new; |
1da177e4 | 488 | |
f28169d2 | 489 | new = parse_chan(line, out, device, opts, error_out); |
e99525f9 | 490 | if (new == NULL) |
d50084a2 JD |
491 | return -1; |
492 | ||
1da177e4 LT |
493 | list_add(&new->list, chans); |
494 | new->output = 1; | |
ee485070 | 495 | line->chan_out = new; |
1da177e4 LT |
496 | } |
497 | else { | |
f28169d2 | 498 | new = parse_chan(line, str, device, opts, error_out); |
e99525f9 | 499 | if (new == NULL) |
d50084a2 JD |
500 | return -1; |
501 | ||
1da177e4 LT |
502 | list_add(&new->list, chans); |
503 | new->input = 1; | |
504 | new->output = 1; | |
ee485070 | 505 | line->chan_in = line->chan_out = new; |
1da177e4 | 506 | } |
d50084a2 | 507 | return 0; |
1da177e4 LT |
508 | } |
509 | ||
2e124b4a | 510 | void chan_interrupt(struct line *line, int irq) |
1da177e4 | 511 | { |
227434f8 | 512 | struct tty_port *port = &line->port; |
bed5e39c | 513 | struct chan *chan = line->chan_in; |
1da177e4 LT |
514 | int err; |
515 | char c; | |
516 | ||
bed5e39c AV |
517 | if (!chan || !chan->ops->read) |
518 | goto out; | |
519 | ||
520 | do { | |
227434f8 | 521 | if (!tty_buffer_request_room(port, 1)) { |
0fcd7199 | 522 | schedule_delayed_work(&line->task, 1); |
bed5e39c AV |
523 | goto out; |
524 | } | |
525 | err = chan->ops->read(chan->fd, &c, chan->data); | |
526 | if (err > 0) | |
92a19f9c | 527 | tty_insert_flip_char(port, c, TTY_NORMAL); |
bed5e39c AV |
528 | } while (err > 0); |
529 | ||
530 | if (err == 0) | |
531 | reactivate_fd(chan->fd, irq); | |
532 | if (err == -EIO) { | |
533 | if (chan->primary) { | |
aa27a094 | 534 | tty_port_tty_hangup(&line->port, false); |
10c890c0 AV |
535 | if (line->chan_out != chan) |
536 | close_one_chan(line->chan_out, 1); | |
1da177e4 | 537 | } |
10c890c0 AV |
538 | close_one_chan(chan, 1); |
539 | if (chan->primary) | |
540 | return; | |
1da177e4 LT |
541 | } |
542 | out: | |
2e124b4a | 543 | tty_flip_buffer_push(port); |
1da177e4 | 544 | } |