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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com) | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include "linux/sched.h" | |
7 | #include "linux/slab.h" | |
8 | #include "linux/list.h" | |
9 | #include "linux/kd.h" | |
10 | #include "linux/interrupt.h" | |
11 | #include "linux/devfs_fs_kernel.h" | |
12 | #include "asm/uaccess.h" | |
13 | #include "chan_kern.h" | |
14 | #include "irq_user.h" | |
15 | #include "line.h" | |
16 | #include "kern.h" | |
17 | #include "user_util.h" | |
18 | #include "kern_util.h" | |
19 | #include "os.h" | |
20 | #include "irq_kern.h" | |
21 | ||
22 | #define LINE_BUFSIZE 4096 | |
23 | ||
24 | static irqreturn_t line_interrupt(int irq, void *data, struct pt_regs *unused) | |
25 | { | |
26 | struct tty_struct *tty = data; | |
27 | struct line *line = tty->driver_data; | |
28 | ||
29 | if (line) | |
30 | chan_interrupt(&line->chan_list, &line->task, tty, irq); | |
31 | return IRQ_HANDLED; | |
32 | } | |
33 | ||
34 | static void line_timer_cb(void *arg) | |
35 | { | |
36 | struct tty_struct *tty = arg; | |
37 | struct line *line = tty->driver_data; | |
38 | ||
39 | line_interrupt(line->driver->read_irq, arg, NULL); | |
40 | } | |
41 | ||
b97b77cc PBG |
42 | /* Returns the free space inside the ring buffer of this line. |
43 | * | |
44 | * Should be called while holding line->lock (this does not modify datas). | |
45 | */ | |
46 | static int write_room(struct line *line) | |
1da177e4 LT |
47 | { |
48 | int n; | |
49 | ||
b97b77cc PBG |
50 | if (line->buffer == NULL) |
51 | return LINE_BUFSIZE - 1; | |
52 | ||
53 | /* This is for the case where the buffer is wrapped! */ | |
54 | n = line->head - line->tail; | |
1da177e4 | 55 | |
1da177e4 | 56 | if (n <= 0) |
b97b77cc PBG |
57 | n = LINE_BUFSIZE + n; /* The other case */ |
58 | return n - 1; | |
59 | } | |
60 | ||
61 | int line_write_room(struct tty_struct *tty) | |
62 | { | |
63 | struct line *line = tty->driver_data; | |
64 | unsigned long flags; | |
65 | int room; | |
66 | ||
67 | if (tty->stopped) | |
68 | return 0; | |
69 | ||
70 | spin_lock_irqsave(&line->lock, flags); | |
71 | room = write_room(line); | |
72 | spin_unlock_irqrestore(&line->lock, flags); | |
73 | ||
74 | /*XXX: Warning to remove */ | |
75 | if (0 == room) | |
76 | printk(KERN_DEBUG "%s: %s: no room left in buffer\n", | |
77 | __FUNCTION__,tty->name); | |
78 | return room; | |
1da177e4 LT |
79 | } |
80 | ||
b97b77cc PBG |
81 | int line_chars_in_buffer(struct tty_struct *tty) |
82 | { | |
83 | struct line *line = tty->driver_data; | |
84 | unsigned long flags; | |
85 | int ret; | |
86 | ||
87 | spin_lock_irqsave(&line->lock, flags); | |
88 | ||
89 | /*write_room subtracts 1 for the needed NULL, so we readd it.*/ | |
90 | ret = LINE_BUFSIZE - (write_room(line) + 1); | |
91 | spin_unlock_irqrestore(&line->lock, flags); | |
92 | ||
93 | return ret; | |
94 | } | |
95 | ||
96 | /* | |
97 | * This copies the content of buf into the circular buffer associated with | |
98 | * this line. | |
99 | * The return value is the number of characters actually copied, i.e. the ones | |
100 | * for which there was space: this function is not supposed to ever flush out | |
101 | * the circular buffer. | |
102 | * | |
103 | * Must be called while holding line->lock! | |
104 | */ | |
1da177e4 LT |
105 | static int buffer_data(struct line *line, const char *buf, int len) |
106 | { | |
107 | int end, room; | |
108 | ||
109 | if(line->buffer == NULL){ | |
110 | line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC); | |
111 | if (line->buffer == NULL) { | |
112 | printk("buffer_data - atomic allocation failed\n"); | |
113 | return(0); | |
114 | } | |
115 | line->head = line->buffer; | |
116 | line->tail = line->buffer; | |
117 | } | |
118 | ||
119 | room = write_room(line); | |
120 | len = (len > room) ? room : len; | |
121 | ||
122 | end = line->buffer + LINE_BUFSIZE - line->tail; | |
b97b77cc PBG |
123 | |
124 | if (len < end){ | |
1da177e4 LT |
125 | memcpy(line->tail, buf, len); |
126 | line->tail += len; | |
d50084a2 JD |
127 | } |
128 | else { | |
b97b77cc | 129 | /* The circular buffer is wrapping */ |
1da177e4 LT |
130 | memcpy(line->tail, buf, end); |
131 | buf += end; | |
132 | memcpy(line->buffer, buf, len - end); | |
133 | line->tail = line->buffer + len - end; | |
134 | } | |
135 | ||
b97b77cc | 136 | return len; |
1da177e4 LT |
137 | } |
138 | ||
b97b77cc PBG |
139 | /* |
140 | * Flushes the ring buffer to the output channels. That is, write_chan is | |
141 | * called, passing it line->head as buffer, and an appropriate count. | |
142 | * | |
143 | * On exit, returns 1 when the buffer is empty, | |
144 | * 0 when the buffer is not empty on exit, | |
145 | * and -errno when an error occurred. | |
146 | * | |
147 | * Must be called while holding line->lock!*/ | |
1da177e4 LT |
148 | static int flush_buffer(struct line *line) |
149 | { | |
150 | int n, count; | |
151 | ||
152 | if ((line->buffer == NULL) || (line->head == line->tail)) | |
b97b77cc | 153 | return 1; |
1da177e4 LT |
154 | |
155 | if (line->tail < line->head) { | |
b97b77cc | 156 | /* line->buffer + LINE_BUFSIZE is the end of the buffer! */ |
1da177e4 | 157 | count = line->buffer + LINE_BUFSIZE - line->head; |
b97b77cc | 158 | |
1da177e4 LT |
159 | n = write_chan(&line->chan_list, line->head, count, |
160 | line->driver->write_irq); | |
161 | if (n < 0) | |
b97b77cc PBG |
162 | return n; |
163 | if (n == count) { | |
164 | /* We have flushed from ->head to buffer end, now we | |
165 | * must flush only from the beginning to ->tail.*/ | |
1da177e4 | 166 | line->head = line->buffer; |
b97b77cc | 167 | } else { |
1da177e4 | 168 | line->head += n; |
b97b77cc | 169 | return 0; |
1da177e4 LT |
170 | } |
171 | } | |
172 | ||
173 | count = line->tail - line->head; | |
d50084a2 | 174 | n = write_chan(&line->chan_list, line->head, count, |
1da177e4 | 175 | line->driver->write_irq); |
b97b77cc PBG |
176 | |
177 | if(n < 0) | |
178 | return n; | |
1da177e4 LT |
179 | |
180 | line->head += n; | |
b97b77cc PBG |
181 | return line->head == line->tail; |
182 | } | |
183 | ||
184 | void line_flush_buffer(struct tty_struct *tty) | |
185 | { | |
186 | struct line *line = tty->driver_data; | |
187 | unsigned long flags; | |
188 | int err; | |
189 | ||
190 | /*XXX: copied from line_write, verify if it is correct!*/ | |
191 | if(tty->stopped) | |
192 | return; | |
193 | //return 0; | |
194 | ||
195 | spin_lock_irqsave(&line->lock, flags); | |
196 | err = flush_buffer(line); | |
197 | /*if (err == 1) | |
198 | err = 0;*/ | |
199 | spin_unlock_irqrestore(&line->lock, flags); | |
200 | //return err; | |
201 | } | |
202 | ||
203 | /* We map both ->flush_chars and ->put_char (which go in pair) onto ->flush_buffer | |
204 | * and ->write. Hope it's not that bad.*/ | |
205 | void line_flush_chars(struct tty_struct *tty) | |
206 | { | |
207 | line_flush_buffer(tty); | |
208 | } | |
209 | ||
210 | void line_put_char(struct tty_struct *tty, unsigned char ch) | |
211 | { | |
212 | line_write(tty, &ch, sizeof(ch)); | |
1da177e4 LT |
213 | } |
214 | ||
215 | int line_write(struct tty_struct *tty, const unsigned char *buf, int len) | |
216 | { | |
217 | struct line *line = tty->driver_data; | |
218 | unsigned long flags; | |
219 | int n, err, ret = 0; | |
220 | ||
b97b77cc PBG |
221 | if(tty->stopped) |
222 | return 0; | |
1da177e4 | 223 | |
b97b77cc PBG |
224 | spin_lock_irqsave(&line->lock, flags); |
225 | if (line->head != line->tail) { | |
1da177e4 LT |
226 | ret = buffer_data(line, buf, len); |
227 | err = flush_buffer(line); | |
b97b77cc | 228 | if (err <= 0 && (err != -EAGAIN || !ret)) |
1da177e4 | 229 | ret = err; |
b97b77cc | 230 | } else { |
d50084a2 | 231 | n = write_chan(&line->chan_list, buf, len, |
1da177e4 | 232 | line->driver->write_irq); |
b97b77cc | 233 | if (n < 0) { |
1da177e4 LT |
234 | ret = n; |
235 | goto out_up; | |
236 | } | |
237 | ||
238 | len -= n; | |
239 | ret += n; | |
b97b77cc | 240 | if (len > 0) |
1da177e4 LT |
241 | ret += buffer_data(line, buf + n, len); |
242 | } | |
b97b77cc PBG |
243 | out_up: |
244 | spin_unlock_irqrestore(&line->lock, flags); | |
245 | return ret; | |
1da177e4 LT |
246 | } |
247 | ||
248 | void line_set_termios(struct tty_struct *tty, struct termios * old) | |
249 | { | |
250 | /* nothing */ | |
251 | } | |
252 | ||
1da177e4 LT |
253 | static struct { |
254 | int cmd; | |
255 | char *level; | |
256 | char *name; | |
257 | } tty_ioctls[] = { | |
258 | /* don't print these, they flood the log ... */ | |
259 | { TCGETS, NULL, "TCGETS" }, | |
260 | { TCSETS, NULL, "TCSETS" }, | |
261 | { TCSETSW, NULL, "TCSETSW" }, | |
262 | { TCFLSH, NULL, "TCFLSH" }, | |
263 | { TCSBRK, NULL, "TCSBRK" }, | |
264 | ||
265 | /* general tty stuff */ | |
266 | { TCSETSF, KERN_DEBUG, "TCSETSF" }, | |
267 | { TCGETA, KERN_DEBUG, "TCGETA" }, | |
268 | { TIOCMGET, KERN_DEBUG, "TIOCMGET" }, | |
269 | { TCSBRKP, KERN_DEBUG, "TCSBRKP" }, | |
270 | { TIOCMSET, KERN_DEBUG, "TIOCMSET" }, | |
271 | ||
272 | /* linux-specific ones */ | |
273 | { TIOCLINUX, KERN_INFO, "TIOCLINUX" }, | |
274 | { KDGKBMODE, KERN_INFO, "KDGKBMODE" }, | |
275 | { KDGKBTYPE, KERN_INFO, "KDGKBTYPE" }, | |
276 | { KDSIGACCEPT, KERN_INFO, "KDSIGACCEPT" }, | |
277 | }; | |
278 | ||
279 | int line_ioctl(struct tty_struct *tty, struct file * file, | |
280 | unsigned int cmd, unsigned long arg) | |
281 | { | |
282 | int ret; | |
283 | int i; | |
284 | ||
285 | ret = 0; | |
286 | switch(cmd) { | |
287 | #ifdef TIOCGETP | |
288 | case TIOCGETP: | |
289 | case TIOCSETP: | |
290 | case TIOCSETN: | |
291 | #endif | |
292 | #ifdef TIOCGETC | |
293 | case TIOCGETC: | |
294 | case TIOCSETC: | |
295 | #endif | |
296 | #ifdef TIOCGLTC | |
297 | case TIOCGLTC: | |
298 | case TIOCSLTC: | |
299 | #endif | |
300 | case TCGETS: | |
301 | case TCSETSF: | |
302 | case TCSETSW: | |
303 | case TCSETS: | |
304 | case TCGETA: | |
305 | case TCSETAF: | |
306 | case TCSETAW: | |
307 | case TCSETA: | |
308 | case TCXONC: | |
309 | case TCFLSH: | |
310 | case TIOCOUTQ: | |
311 | case TIOCINQ: | |
312 | case TIOCGLCKTRMIOS: | |
313 | case TIOCSLCKTRMIOS: | |
314 | case TIOCPKT: | |
315 | case TIOCGSOFTCAR: | |
316 | case TIOCSSOFTCAR: | |
317 | return -ENOIOCTLCMD; | |
318 | #if 0 | |
319 | case TCwhatever: | |
320 | /* do something */ | |
321 | break; | |
322 | #endif | |
323 | default: | |
324 | for (i = 0; i < ARRAY_SIZE(tty_ioctls); i++) | |
325 | if (cmd == tty_ioctls[i].cmd) | |
326 | break; | |
327 | if (i < ARRAY_SIZE(tty_ioctls)) { | |
328 | if (NULL != tty_ioctls[i].level) | |
329 | printk("%s%s: %s: ioctl %s called\n", | |
330 | tty_ioctls[i].level, __FUNCTION__, | |
331 | tty->name, tty_ioctls[i].name); | |
332 | } else { | |
333 | printk(KERN_ERR "%s: %s: unknown ioctl: 0x%x\n", | |
334 | __FUNCTION__, tty->name, cmd); | |
335 | } | |
336 | ret = -ENOIOCTLCMD; | |
337 | break; | |
338 | } | |
b97b77cc | 339 | return ret; |
1da177e4 LT |
340 | } |
341 | ||
342 | static irqreturn_t line_write_interrupt(int irq, void *data, | |
343 | struct pt_regs *unused) | |
344 | { | |
345 | struct tty_struct *tty = data; | |
346 | struct line *line = tty->driver_data; | |
347 | int err; | |
348 | ||
b97b77cc PBG |
349 | /* Interrupts are enabled here because we registered the interrupt with |
350 | * SA_INTERRUPT (see line_setup_irq).*/ | |
351 | ||
352 | spin_lock_irq(&line->lock); | |
1da177e4 | 353 | err = flush_buffer(line); |
b97b77cc PBG |
354 | if (err == 0) { |
355 | return IRQ_NONE; | |
356 | } else if(err < 0) { | |
1da177e4 LT |
357 | line->head = line->buffer; |
358 | line->tail = line->buffer; | |
359 | } | |
b97b77cc | 360 | spin_unlock_irq(&line->lock); |
1da177e4 LT |
361 | |
362 | if(tty == NULL) | |
b97b77cc | 363 | return IRQ_NONE; |
1da177e4 | 364 | |
b97b77cc | 365 | if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && |
1da177e4 LT |
366 | (tty->ldisc.write_wakeup != NULL)) |
367 | (tty->ldisc.write_wakeup)(tty); | |
368 | ||
369 | /* BLOCKING mode | |
370 | * In blocking mode, everything sleeps on tty->write_wait. | |
371 | * Sleeping in the console driver would break non-blocking | |
372 | * writes. | |
373 | */ | |
374 | ||
b97b77cc | 375 | if (waitqueue_active(&tty->write_wait)) |
1da177e4 | 376 | wake_up_interruptible(&tty->write_wait); |
b97b77cc | 377 | return IRQ_HANDLED; |
1da177e4 LT |
378 | } |
379 | ||
380 | int line_setup_irq(int fd, int input, int output, struct tty_struct *tty) | |
381 | { | |
382 | struct line *line = tty->driver_data; | |
383 | struct line_driver *driver = line->driver; | |
384 | int err = 0, flags = SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM; | |
385 | ||
b97b77cc PBG |
386 | if (input) |
387 | err = um_request_irq(driver->read_irq, fd, IRQ_READ, | |
d50084a2 | 388 | line_interrupt, flags, |
1da177e4 | 389 | driver->read_irq_name, tty); |
b97b77cc PBG |
390 | if (err) |
391 | return err; | |
392 | if (output) | |
393 | err = um_request_irq(driver->write_irq, fd, IRQ_WRITE, | |
d50084a2 | 394 | line_write_interrupt, flags, |
1da177e4 LT |
395 | driver->write_irq_name, tty); |
396 | line->have_irq = 1; | |
b97b77cc | 397 | return err; |
1da177e4 LT |
398 | } |
399 | ||
400 | void line_disable(struct tty_struct *tty, int current_irq) | |
401 | { | |
402 | struct line *line = tty->driver_data; | |
403 | ||
404 | if(!line->have_irq) | |
405 | return; | |
406 | ||
407 | if(line->driver->read_irq == current_irq) | |
408 | free_irq_later(line->driver->read_irq, tty); | |
409 | else { | |
1da177e4 LT |
410 | free_irq(line->driver->read_irq, tty); |
411 | } | |
412 | ||
413 | if(line->driver->write_irq == current_irq) | |
414 | free_irq_later(line->driver->write_irq, tty); | |
415 | else { | |
1da177e4 LT |
416 | free_irq(line->driver->write_irq, tty); |
417 | } | |
418 | ||
419 | line->have_irq = 0; | |
420 | } | |
421 | ||
422 | int line_open(struct line *lines, struct tty_struct *tty, | |
423 | struct chan_opts *opts) | |
424 | { | |
425 | struct line *line; | |
426 | int err = 0; | |
427 | ||
428 | line = &lines[tty->index]; | |
429 | tty->driver_data = line; | |
430 | ||
b97b77cc PBG |
431 | /* The IRQ which takes this lock is not yet enabled and won't be run |
432 | * before the end, so we don't need to use spin_lock_irq.*/ | |
433 | spin_lock(&line->lock); | |
1da177e4 LT |
434 | if (tty->count == 1) { |
435 | if (!line->valid) { | |
436 | err = -ENODEV; | |
437 | goto out; | |
438 | } | |
439 | if (list_empty(&line->chan_list)) { | |
440 | err = parse_chan_pair(line->init_str, &line->chan_list, | |
88890b88 | 441 | tty->index, opts); |
1da177e4 LT |
442 | if(err) goto out; |
443 | err = open_chan(&line->chan_list); | |
444 | if(err) goto out; | |
445 | } | |
b97b77cc | 446 | /* Here the interrupt is registered.*/ |
1da177e4 LT |
447 | enable_chan(&line->chan_list, tty); |
448 | INIT_WORK(&line->task, line_timer_cb, tty); | |
449 | } | |
450 | ||
451 | if(!line->sigio){ | |
452 | chan_enable_winch(&line->chan_list, tty); | |
453 | line->sigio = 1; | |
454 | } | |
455 | chan_window_size(&line->chan_list, &tty->winsize.ws_row, | |
456 | &tty->winsize.ws_col); | |
457 | line->count++; | |
458 | ||
459 | out: | |
b97b77cc PBG |
460 | spin_unlock(&line->lock); |
461 | return err; | |
1da177e4 LT |
462 | } |
463 | ||
cd2ee4a3 JD |
464 | static void unregister_winch(struct tty_struct *tty); |
465 | ||
1da177e4 LT |
466 | void line_close(struct tty_struct *tty, struct file * filp) |
467 | { | |
468 | struct line *line = tty->driver_data; | |
469 | ||
cd2ee4a3 JD |
470 | /* XXX: I assume this should be called in process context, not with |
471 | * interrupts disabled! | |
472 | */ | |
b97b77cc PBG |
473 | spin_lock_irq(&line->lock); |
474 | ||
475 | /* We ignore the error anyway! */ | |
476 | flush_buffer(line); | |
477 | ||
1da177e4 LT |
478 | line->count--; |
479 | if (tty->count == 1) { | |
480 | line_disable(tty, -1); | |
481 | tty->driver_data = NULL; | |
482 | } | |
cd2ee4a3 JD |
483 | |
484 | if((line->count == 0) && line->sigio){ | |
485 | unregister_winch(tty); | |
486 | line->sigio = 0; | |
487 | } | |
488 | ||
b97b77cc | 489 | spin_unlock_irq(&line->lock); |
1da177e4 LT |
490 | } |
491 | ||
492 | void close_lines(struct line *lines, int nlines) | |
493 | { | |
494 | int i; | |
495 | ||
496 | for(i = 0; i < nlines; i++) | |
497 | close_chan(&lines[i].chan_list); | |
498 | } | |
499 | ||
b97b77cc PBG |
500 | /* Common setup code for both startup command line and mconsole initialization. |
501 | * @lines contains the the array (of size @num) to modify; | |
502 | * @init is the setup string; | |
d571cd18 | 503 | */ |
b97b77cc | 504 | |
d571cd18 | 505 | int line_setup(struct line *lines, unsigned int num, char *init) |
1da177e4 LT |
506 | { |
507 | int i, n; | |
508 | char *end; | |
509 | ||
b97b77cc PBG |
510 | if(*init == '=') { |
511 | /* We said con=/ssl= instead of con#=, so we are configuring all | |
512 | * consoles at once.*/ | |
513 | n = -1; | |
d50084a2 JD |
514 | } |
515 | else { | |
1da177e4 LT |
516 | n = simple_strtoul(init, &end, 0); |
517 | if(*end != '='){ | |
d50084a2 | 518 | printk(KERN_ERR "line_setup failed to parse \"%s\"\n", |
1da177e4 | 519 | init); |
b97b77cc | 520 | return 0; |
1da177e4 LT |
521 | } |
522 | init = end; | |
523 | } | |
524 | init++; | |
b97b77cc PBG |
525 | |
526 | if (n >= (signed int) num) { | |
1da177e4 LT |
527 | printk("line_setup - %d out of range ((0 ... %d) allowed)\n", |
528 | n, num - 1); | |
b97b77cc | 529 | return 0; |
d50084a2 JD |
530 | } |
531 | else if (n >= 0){ | |
1da177e4 LT |
532 | if (lines[n].count > 0) { |
533 | printk("line_setup - device %d is open\n", n); | |
b97b77cc | 534 | return 0; |
1da177e4 LT |
535 | } |
536 | if (lines[n].init_pri <= INIT_ONE){ | |
537 | lines[n].init_pri = INIT_ONE; | |
538 | if (!strcmp(init, "none")) | |
539 | lines[n].valid = 0; | |
540 | else { | |
541 | lines[n].init_str = init; | |
542 | lines[n].valid = 1; | |
543 | } | |
544 | } | |
d50084a2 | 545 | } |
d50084a2 | 546 | else { |
1da177e4 LT |
547 | for(i = 0; i < num; i++){ |
548 | if(lines[i].init_pri <= INIT_ALL){ | |
549 | lines[i].init_pri = INIT_ALL; | |
550 | if(!strcmp(init, "none")) lines[i].valid = 0; | |
551 | else { | |
552 | lines[i].init_str = init; | |
553 | lines[i].valid = 1; | |
554 | } | |
555 | } | |
556 | } | |
557 | } | |
b97b77cc | 558 | return 1; |
1da177e4 LT |
559 | } |
560 | ||
b97b77cc | 561 | int line_config(struct line *lines, unsigned int num, char *str) |
1da177e4 | 562 | { |
970d6e3a | 563 | char *new; |
1da177e4 | 564 | |
d571cd18 JD |
565 | if(*str == '='){ |
566 | printk("line_config - can't configure all devices from " | |
567 | "mconsole\n"); | |
568 | return 1; | |
569 | } | |
570 | ||
970d6e3a | 571 | new = kstrdup(str, GFP_KERNEL); |
1da177e4 | 572 | if(new == NULL){ |
970d6e3a | 573 | printk("line_config - kstrdup failed\n"); |
b97b77cc | 574 | return -ENOMEM; |
1da177e4 | 575 | } |
d571cd18 | 576 | return !line_setup(lines, num, new); |
1da177e4 LT |
577 | } |
578 | ||
b97b77cc | 579 | int line_get_config(char *name, struct line *lines, unsigned int num, char *str, |
1da177e4 LT |
580 | int size, char **error_out) |
581 | { | |
582 | struct line *line; | |
583 | char *end; | |
584 | int dev, n = 0; | |
585 | ||
586 | dev = simple_strtoul(name, &end, 0); | |
587 | if((*end != '\0') || (end == name)){ | |
588 | *error_out = "line_get_config failed to parse device number"; | |
b97b77cc | 589 | return 0; |
1da177e4 LT |
590 | } |
591 | ||
592 | if((dev < 0) || (dev >= num)){ | |
b97b77cc PBG |
593 | *error_out = "device number out of range"; |
594 | return 0; | |
1da177e4 LT |
595 | } |
596 | ||
597 | line = &lines[dev]; | |
598 | ||
b97b77cc | 599 | spin_lock(&line->lock); |
1da177e4 LT |
600 | if(!line->valid) |
601 | CONFIG_CHUNK(str, size, n, "none", 1); | |
602 | else if(line->count == 0) | |
603 | CONFIG_CHUNK(str, size, n, line->init_str, 1); | |
604 | else n = chan_config_string(&line->chan_list, str, size, error_out); | |
b97b77cc | 605 | spin_unlock(&line->lock); |
1da177e4 | 606 | |
b97b77cc | 607 | return n; |
1da177e4 LT |
608 | } |
609 | ||
29d56cfe JD |
610 | int line_id(char **str, int *start_out, int *end_out) |
611 | { | |
612 | char *end; | |
613 | int n; | |
614 | ||
615 | n = simple_strtoul(*str, &end, 0); | |
616 | if((*end != '\0') || (end == *str)) | |
617 | return -1; | |
618 | ||
619 | *str = end; | |
620 | *start_out = n; | |
621 | *end_out = n; | |
622 | return n; | |
623 | } | |
624 | ||
625 | int line_remove(struct line *lines, unsigned int num, int n) | |
1da177e4 LT |
626 | { |
627 | char config[sizeof("conxxxx=none\0")]; | |
628 | ||
29d56cfe | 629 | sprintf(config, "%d=none", n); |
d571cd18 | 630 | return !line_setup(lines, num, config); |
1da177e4 LT |
631 | } |
632 | ||
633 | struct tty_driver *line_register_devfs(struct lines *set, | |
d50084a2 | 634 | struct line_driver *line_driver, |
1da177e4 LT |
635 | struct tty_operations *ops, struct line *lines, |
636 | int nlines) | |
637 | { | |
638 | int i; | |
639 | struct tty_driver *driver = alloc_tty_driver(nlines); | |
640 | ||
641 | if (!driver) | |
642 | return NULL; | |
643 | ||
644 | driver->driver_name = line_driver->name; | |
645 | driver->name = line_driver->device_name; | |
646 | driver->devfs_name = line_driver->devfs_name; | |
647 | driver->major = line_driver->major; | |
648 | driver->minor_start = line_driver->minor_start; | |
649 | driver->type = line_driver->type; | |
650 | driver->subtype = line_driver->subtype; | |
651 | driver->flags = TTY_DRIVER_REAL_RAW; | |
652 | driver->init_termios = tty_std_termios; | |
653 | tty_set_operations(driver, ops); | |
654 | ||
655 | if (tty_register_driver(driver)) { | |
656 | printk("%s: can't register %s driver\n", | |
657 | __FUNCTION__,line_driver->name); | |
658 | put_tty_driver(driver); | |
659 | return NULL; | |
660 | } | |
661 | ||
662 | for(i = 0; i < nlines; i++){ | |
d50084a2 | 663 | if(!lines[i].valid) |
1da177e4 LT |
664 | tty_unregister_device(driver, i); |
665 | } | |
666 | ||
667 | mconsole_register_dev(&line_driver->mc); | |
668 | return driver; | |
669 | } | |
670 | ||
605a69ac PBG |
671 | static spinlock_t winch_handler_lock; |
672 | LIST_HEAD(winch_handlers); | |
673 | ||
1da177e4 LT |
674 | void lines_init(struct line *lines, int nlines) |
675 | { | |
676 | struct line *line; | |
677 | int i; | |
678 | ||
605a69ac | 679 | spin_lock_init(&winch_handler_lock); |
1da177e4 LT |
680 | for(i = 0; i < nlines; i++){ |
681 | line = &lines[i]; | |
682 | INIT_LIST_HEAD(&line->chan_list); | |
b97b77cc | 683 | spin_lock_init(&line->lock); |
d50084a2 JD |
684 | if(line->init_str == NULL) |
685 | continue; | |
686 | ||
687 | line->init_str = kstrdup(line->init_str, GFP_KERNEL); | |
688 | if(line->init_str == NULL) | |
689 | printk("lines_init - kstrdup returned NULL\n"); | |
1da177e4 LT |
690 | } |
691 | } | |
692 | ||
693 | struct winch { | |
694 | struct list_head list; | |
695 | int fd; | |
696 | int tty_fd; | |
697 | int pid; | |
698 | struct tty_struct *tty; | |
699 | }; | |
700 | ||
701 | irqreturn_t winch_interrupt(int irq, void *data, struct pt_regs *unused) | |
702 | { | |
703 | struct winch *winch = data; | |
704 | struct tty_struct *tty; | |
705 | struct line *line; | |
706 | int err; | |
707 | char c; | |
708 | ||
709 | if(winch->fd != -1){ | |
710 | err = generic_read(winch->fd, &c, NULL); | |
711 | if(err < 0){ | |
712 | if(err != -EAGAIN){ | |
713 | printk("winch_interrupt : read failed, " | |
714 | "errno = %d\n", -err); | |
715 | printk("fd %d is losing SIGWINCH support\n", | |
716 | winch->tty_fd); | |
b97b77cc | 717 | return IRQ_HANDLED; |
1da177e4 LT |
718 | } |
719 | goto out; | |
720 | } | |
721 | } | |
722 | tty = winch->tty; | |
723 | if (tty != NULL) { | |
724 | line = tty->driver_data; | |
d50084a2 | 725 | chan_window_size(&line->chan_list, &tty->winsize.ws_row, |
1da177e4 LT |
726 | &tty->winsize.ws_col); |
727 | kill_pg(tty->pgrp, SIGWINCH, 1); | |
728 | } | |
729 | out: | |
730 | if(winch->fd != -1) | |
731 | reactivate_fd(winch->fd, WINCH_IRQ); | |
b97b77cc | 732 | return IRQ_HANDLED; |
1da177e4 LT |
733 | } |
734 | ||
1da177e4 LT |
735 | void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty) |
736 | { | |
737 | struct winch *winch; | |
738 | ||
1da177e4 LT |
739 | winch = kmalloc(sizeof(*winch), GFP_KERNEL); |
740 | if (winch == NULL) { | |
741 | printk("register_winch_irq - kmalloc failed\n"); | |
605a69ac | 742 | return; |
1da177e4 | 743 | } |
605a69ac | 744 | |
1da177e4 LT |
745 | *winch = ((struct winch) { .list = LIST_HEAD_INIT(winch->list), |
746 | .fd = fd, | |
747 | .tty_fd = tty_fd, | |
748 | .pid = pid, | |
749 | .tty = tty }); | |
605a69ac PBG |
750 | |
751 | spin_lock(&winch_handler_lock); | |
1da177e4 | 752 | list_add(&winch->list, &winch_handlers); |
605a69ac PBG |
753 | spin_unlock(&winch_handler_lock); |
754 | ||
b97b77cc | 755 | if(um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt, |
d50084a2 | 756 | SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM, |
1da177e4 LT |
757 | "winch", winch) < 0) |
758 | printk("register_winch_irq - failed to register IRQ\n"); | |
1da177e4 LT |
759 | } |
760 | ||
cd2ee4a3 JD |
761 | static void unregister_winch(struct tty_struct *tty) |
762 | { | |
763 | struct list_head *ele; | |
764 | struct winch *winch, *found = NULL; | |
765 | ||
605a69ac | 766 | spin_lock(&winch_handler_lock); |
cd2ee4a3 JD |
767 | list_for_each(ele, &winch_handlers){ |
768 | winch = list_entry(ele, struct winch, list); | |
769 | if(winch->tty == tty){ | |
770 | found = winch; | |
771 | break; | |
772 | } | |
773 | } | |
cd2ee4a3 | 774 | if(found == NULL) |
605a69ac PBG |
775 | goto err; |
776 | ||
777 | list_del(&winch->list); | |
778 | spin_unlock(&winch_handler_lock); | |
cd2ee4a3 JD |
779 | |
780 | if(winch->pid != -1) | |
781 | os_kill_process(winch->pid, 1); | |
782 | ||
cd2ee4a3 | 783 | free_irq(WINCH_IRQ, winch); |
cd2ee4a3 | 784 | kfree(winch); |
605a69ac PBG |
785 | |
786 | return; | |
787 | err: | |
788 | spin_unlock(&winch_handler_lock); | |
cd2ee4a3 JD |
789 | } |
790 | ||
605a69ac PBG |
791 | /* XXX: No lock as it's an exitcall... is this valid? Depending on cleanup |
792 | * order... are we sure that nothing else is done on the list? */ | |
1da177e4 LT |
793 | static void winch_cleanup(void) |
794 | { | |
795 | struct list_head *ele; | |
796 | struct winch *winch; | |
797 | ||
798 | list_for_each(ele, &winch_handlers){ | |
799 | winch = list_entry(ele, struct winch, list); | |
800 | if(winch->fd != -1){ | |
605a69ac PBG |
801 | /* Why is this different from the above free_irq(), |
802 | * which deactivates SIGIO? This searches the FD | |
803 | * somewhere else and removes it from the list... */ | |
1da177e4 LT |
804 | deactivate_fd(winch->fd, WINCH_IRQ); |
805 | os_close_file(winch->fd); | |
806 | } | |
d50084a2 | 807 | if(winch->pid != -1) |
1da177e4 LT |
808 | os_kill_process(winch->pid, 1); |
809 | } | |
810 | } | |
811 | __uml_exitcall(winch_cleanup); | |
812 | ||
813 | char *add_xterm_umid(char *base) | |
814 | { | |
815 | char *umid, *title; | |
816 | int len; | |
817 | ||
818 | umid = get_umid(1); | |
b97b77cc PBG |
819 | if(umid == NULL) |
820 | return base; | |
1da177e4 LT |
821 | |
822 | len = strlen(base) + strlen(" ()") + strlen(umid) + 1; | |
823 | title = kmalloc(len, GFP_KERNEL); | |
824 | if(title == NULL){ | |
825 | printk("Failed to allocate buffer for xterm title\n"); | |
b97b77cc | 826 | return base; |
1da177e4 LT |
827 | } |
828 | ||
829 | snprintf(title, len, "%s (%s)", base, umid); | |
b97b77cc | 830 | return title; |
1da177e4 | 831 | } |