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1da177e4 LT |
1 | /* |
2 | * generic_serial.c | |
3 | * | |
4 | * Copyright (C) 1998/1999 R.E.Wolff@BitWizard.nl | |
5 | * | |
6 | * written for the SX serial driver. | |
7 | * Contains the code that should be shared over all the serial drivers. | |
8 | * | |
9 | * Credit for the idea to do it this way might go to Alan Cox. | |
10 | * | |
11 | * | |
12 | * Version 0.1 -- December, 1998. Initial version. | |
13 | * Version 0.2 -- March, 1999. Some more routines. Bugfixes. Etc. | |
14 | * Version 0.5 -- August, 1999. Some more fixes. Reformat for Linus. | |
15 | * | |
16 | * BitWizard is actively maintaining this file. We sometimes find | |
17 | * that someone submitted changes to this file. We really appreciate | |
18 | * your help, but please submit changes through us. We're doing our | |
19 | * best to be responsive. -- REW | |
20 | * */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/tty.h> | |
25 | #include <linux/serial.h> | |
26 | #include <linux/mm.h> | |
27 | #include <linux/generic_serial.h> | |
28 | #include <linux/interrupt.h> | |
29 | #include <linux/tty_flip.h> | |
30 | #include <linux/delay.h> | |
1da177e4 LT |
31 | #include <asm/uaccess.h> |
32 | ||
33 | #define DEBUG | |
34 | ||
1da177e4 LT |
35 | static int gs_debug; |
36 | ||
37 | #ifdef DEBUG | |
38 | #define gs_dprintk(f, str...) if (gs_debug & f) printk (str) | |
39 | #else | |
40 | #define gs_dprintk(f, str...) /* nothing */ | |
41 | #endif | |
42 | ||
bf9d8929 HH |
43 | #define func_enter() gs_dprintk (GS_DEBUG_FLOW, "gs: enter %s\n", __func__) |
44 | #define func_exit() gs_dprintk (GS_DEBUG_FLOW, "gs: exit %s\n", __func__) | |
1da177e4 LT |
45 | |
46 | #define RS_EVENT_WRITE_WAKEUP 1 | |
47 | ||
48 | module_param(gs_debug, int, 0644); | |
49 | ||
50 | ||
76b25a55 | 51 | int gs_put_char(struct tty_struct * tty, unsigned char ch) |
1da177e4 LT |
52 | { |
53 | struct gs_port *port; | |
1da177e4 LT |
54 | |
55 | func_enter (); | |
56 | ||
1da177e4 LT |
57 | port = tty->driver_data; |
58 | ||
76b25a55 | 59 | if (!port) return 0; |
1da177e4 | 60 | |
b5391e29 | 61 | if (! (port->port.flags & ASYNC_INITIALIZED)) return 0; |
1da177e4 LT |
62 | |
63 | /* Take a lock on the serial tranmit buffer! */ | |
35426128 | 64 | mutex_lock(& port->port_write_mutex); |
1da177e4 LT |
65 | |
66 | if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) { | |
67 | /* Sorry, buffer is full, drop character. Update statistics???? -- REW */ | |
35426128 | 68 | mutex_unlock(&port->port_write_mutex); |
76b25a55 | 69 | return 0; |
1da177e4 LT |
70 | } |
71 | ||
72 | port->xmit_buf[port->xmit_head++] = ch; | |
73 | port->xmit_head &= SERIAL_XMIT_SIZE - 1; | |
74 | port->xmit_cnt++; /* Characters in buffer */ | |
75 | ||
35426128 | 76 | mutex_unlock(&port->port_write_mutex); |
1da177e4 | 77 | func_exit (); |
76b25a55 | 78 | return 1; |
1da177e4 LT |
79 | } |
80 | ||
81 | ||
1da177e4 LT |
82 | /* |
83 | > Problems to take into account are: | |
84 | > -1- Interrupts that empty part of the buffer. | |
85 | > -2- page faults on the access to userspace. | |
86 | > -3- Other processes that are also trying to do a "write". | |
87 | */ | |
88 | ||
89 | int gs_write(struct tty_struct * tty, | |
90 | const unsigned char *buf, int count) | |
91 | { | |
92 | struct gs_port *port; | |
93 | int c, total = 0; | |
94 | int t; | |
95 | ||
96 | func_enter (); | |
97 | ||
1da177e4 LT |
98 | port = tty->driver_data; |
99 | ||
100 | if (!port) return 0; | |
101 | ||
b5391e29 | 102 | if (! (port->port.flags & ASYNC_INITIALIZED)) |
1da177e4 LT |
103 | return 0; |
104 | ||
105 | /* get exclusive "write" access to this port (problem 3) */ | |
106 | /* This is not a spinlock because we can have a disk access (page | |
107 | fault) in copy_from_user */ | |
81861d78 | 108 | mutex_lock(& port->port_write_mutex); |
1da177e4 LT |
109 | |
110 | while (1) { | |
111 | ||
112 | c = count; | |
113 | ||
114 | /* This is safe because we "OWN" the "head". Noone else can | |
81861d78 | 115 | change the "head": we own the port_write_mutex. */ |
1da177e4 LT |
116 | /* Don't overrun the end of the buffer */ |
117 | t = SERIAL_XMIT_SIZE - port->xmit_head; | |
118 | if (t < c) c = t; | |
119 | ||
120 | /* This is safe because the xmit_cnt can only decrease. This | |
121 | would increase "t", so we might copy too little chars. */ | |
122 | /* Don't copy past the "head" of the buffer */ | |
123 | t = SERIAL_XMIT_SIZE - 1 - port->xmit_cnt; | |
124 | if (t < c) c = t; | |
125 | ||
126 | /* Can't copy more? break out! */ | |
127 | if (c <= 0) break; | |
128 | ||
129 | memcpy (port->xmit_buf + port->xmit_head, buf, c); | |
130 | ||
131 | port -> xmit_cnt += c; | |
132 | port -> xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE -1); | |
133 | buf += c; | |
134 | count -= c; | |
135 | total += c; | |
136 | } | |
81861d78 | 137 | mutex_unlock(& port->port_write_mutex); |
1da177e4 LT |
138 | |
139 | gs_dprintk (GS_DEBUG_WRITE, "write: interrupts are %s\n", | |
b5391e29 | 140 | (port->port.flags & GS_TX_INTEN)?"enabled": "disabled"); |
1da177e4 LT |
141 | |
142 | if (port->xmit_cnt && | |
143 | !tty->stopped && | |
144 | !tty->hw_stopped && | |
b5391e29 AC |
145 | !(port->port.flags & GS_TX_INTEN)) { |
146 | port->port.flags |= GS_TX_INTEN; | |
1da177e4 LT |
147 | port->rd->enable_tx_interrupts (port); |
148 | } | |
149 | func_exit (); | |
150 | return total; | |
151 | } | |
1da177e4 LT |
152 | |
153 | ||
154 | ||
155 | int gs_write_room(struct tty_struct * tty) | |
156 | { | |
157 | struct gs_port *port = tty->driver_data; | |
158 | int ret; | |
159 | ||
160 | func_enter (); | |
161 | ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1; | |
162 | if (ret < 0) | |
163 | ret = 0; | |
164 | func_exit (); | |
165 | return ret; | |
166 | } | |
167 | ||
168 | ||
169 | int gs_chars_in_buffer(struct tty_struct *tty) | |
170 | { | |
171 | struct gs_port *port = tty->driver_data; | |
172 | func_enter (); | |
173 | ||
174 | func_exit (); | |
175 | return port->xmit_cnt; | |
176 | } | |
177 | ||
178 | ||
179 | static int gs_real_chars_in_buffer(struct tty_struct *tty) | |
180 | { | |
181 | struct gs_port *port; | |
182 | func_enter (); | |
183 | ||
1da177e4 LT |
184 | port = tty->driver_data; |
185 | ||
186 | if (!port->rd) return 0; | |
187 | if (!port->rd->chars_in_buffer) return 0; | |
188 | ||
189 | func_exit (); | |
190 | return port->xmit_cnt + port->rd->chars_in_buffer (port); | |
191 | } | |
192 | ||
193 | ||
194 | static int gs_wait_tx_flushed (void * ptr, unsigned long timeout) | |
195 | { | |
196 | struct gs_port *port = ptr; | |
197 | unsigned long end_jiffies; | |
198 | int jiffies_to_transmit, charsleft = 0, rv = 0; | |
199 | int rcib; | |
200 | ||
201 | func_enter(); | |
202 | ||
203 | gs_dprintk (GS_DEBUG_FLUSH, "port=%p.\n", port); | |
204 | if (port) { | |
205 | gs_dprintk (GS_DEBUG_FLUSH, "xmit_cnt=%x, xmit_buf=%p, tty=%p.\n", | |
b5391e29 | 206 | port->xmit_cnt, port->xmit_buf, port->port.tty); |
1da177e4 LT |
207 | } |
208 | ||
209 | if (!port || port->xmit_cnt < 0 || !port->xmit_buf) { | |
210 | gs_dprintk (GS_DEBUG_FLUSH, "ERROR: !port, !port->xmit_buf or prot->xmit_cnt < 0.\n"); | |
211 | func_exit(); | |
212 | return -EINVAL; /* This is an error which we don't know how to handle. */ | |
213 | } | |
214 | ||
b5391e29 | 215 | rcib = gs_real_chars_in_buffer(port->port.tty); |
1da177e4 LT |
216 | |
217 | if(rcib <= 0) { | |
218 | gs_dprintk (GS_DEBUG_FLUSH, "nothing to wait for.\n"); | |
219 | func_exit(); | |
220 | return rv; | |
221 | } | |
222 | /* stop trying: now + twice the time it would normally take + seconds */ | |
223 | if (timeout == 0) timeout = MAX_SCHEDULE_TIMEOUT; | |
224 | end_jiffies = jiffies; | |
225 | if (timeout != MAX_SCHEDULE_TIMEOUT) | |
226 | end_jiffies += port->baud?(2 * rcib * 10 * HZ / port->baud):0; | |
227 | end_jiffies += timeout; | |
228 | ||
229 | gs_dprintk (GS_DEBUG_FLUSH, "now=%lx, end=%lx (%ld).\n", | |
230 | jiffies, end_jiffies, end_jiffies-jiffies); | |
231 | ||
232 | /* the expression is actually jiffies < end_jiffies, but that won't | |
233 | work around the wraparound. Tricky eh? */ | |
b5391e29 | 234 | while ((charsleft = gs_real_chars_in_buffer (port->port.tty)) && |
1da177e4 LT |
235 | time_after (end_jiffies, jiffies)) { |
236 | /* Units check: | |
237 | chars * (bits/char) * (jiffies /sec) / (bits/sec) = jiffies! | |
238 | check! */ | |
239 | ||
240 | charsleft += 16; /* Allow 16 chars more to be transmitted ... */ | |
241 | jiffies_to_transmit = port->baud?(1 + charsleft * 10 * HZ / port->baud):0; | |
242 | /* ^^^ Round up.... */ | |
243 | if (jiffies_to_transmit <= 0) jiffies_to_transmit = 1; | |
244 | ||
245 | gs_dprintk (GS_DEBUG_FLUSH, "Expect to finish in %d jiffies " | |
246 | "(%d chars).\n", jiffies_to_transmit, charsleft); | |
247 | ||
248 | msleep_interruptible(jiffies_to_msecs(jiffies_to_transmit)); | |
249 | if (signal_pending (current)) { | |
250 | gs_dprintk (GS_DEBUG_FLUSH, "Signal pending. Bombing out: "); | |
251 | rv = -EINTR; | |
252 | break; | |
253 | } | |
254 | } | |
255 | ||
256 | gs_dprintk (GS_DEBUG_FLUSH, "charsleft = %d.\n", charsleft); | |
257 | set_current_state (TASK_RUNNING); | |
258 | ||
259 | func_exit(); | |
260 | return rv; | |
261 | } | |
262 | ||
263 | ||
264 | ||
265 | void gs_flush_buffer(struct tty_struct *tty) | |
266 | { | |
267 | struct gs_port *port; | |
268 | unsigned long flags; | |
269 | ||
270 | func_enter (); | |
271 | ||
1da177e4 LT |
272 | port = tty->driver_data; |
273 | ||
274 | if (!port) return; | |
275 | ||
276 | /* XXX Would the write semaphore do? */ | |
277 | spin_lock_irqsave (&port->driver_lock, flags); | |
278 | port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; | |
279 | spin_unlock_irqrestore (&port->driver_lock, flags); | |
280 | ||
1da177e4 LT |
281 | tty_wakeup(tty); |
282 | func_exit (); | |
283 | } | |
284 | ||
285 | ||
286 | void gs_flush_chars(struct tty_struct * tty) | |
287 | { | |
288 | struct gs_port *port; | |
289 | ||
290 | func_enter (); | |
291 | ||
1da177e4 LT |
292 | port = tty->driver_data; |
293 | ||
294 | if (!port) return; | |
295 | ||
296 | if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || | |
297 | !port->xmit_buf) { | |
298 | func_exit (); | |
299 | return; | |
300 | } | |
301 | ||
302 | /* Beats me -- REW */ | |
b5391e29 | 303 | port->port.flags |= GS_TX_INTEN; |
1da177e4 LT |
304 | port->rd->enable_tx_interrupts (port); |
305 | func_exit (); | |
306 | } | |
307 | ||
308 | ||
309 | void gs_stop(struct tty_struct * tty) | |
310 | { | |
311 | struct gs_port *port; | |
312 | ||
313 | func_enter (); | |
314 | ||
1da177e4 LT |
315 | port = tty->driver_data; |
316 | ||
317 | if (!port) return; | |
318 | ||
319 | if (port->xmit_cnt && | |
320 | port->xmit_buf && | |
b5391e29 AC |
321 | (port->port.flags & GS_TX_INTEN) ) { |
322 | port->port.flags &= ~GS_TX_INTEN; | |
1da177e4 LT |
323 | port->rd->disable_tx_interrupts (port); |
324 | } | |
325 | func_exit (); | |
326 | } | |
327 | ||
328 | ||
329 | void gs_start(struct tty_struct * tty) | |
330 | { | |
331 | struct gs_port *port; | |
332 | ||
1da177e4 LT |
333 | port = tty->driver_data; |
334 | ||
335 | if (!port) return; | |
336 | ||
337 | if (port->xmit_cnt && | |
338 | port->xmit_buf && | |
b5391e29 AC |
339 | !(port->port.flags & GS_TX_INTEN) ) { |
340 | port->port.flags |= GS_TX_INTEN; | |
1da177e4 LT |
341 | port->rd->enable_tx_interrupts (port); |
342 | } | |
343 | func_exit (); | |
344 | } | |
345 | ||
346 | ||
347 | static void gs_shutdown_port (struct gs_port *port) | |
348 | { | |
349 | unsigned long flags; | |
350 | ||
351 | func_enter(); | |
352 | ||
353 | if (!port) return; | |
354 | ||
b5391e29 | 355 | if (!(port->port.flags & ASYNC_INITIALIZED)) |
1da177e4 LT |
356 | return; |
357 | ||
358 | spin_lock_irqsave(&port->driver_lock, flags); | |
359 | ||
360 | if (port->xmit_buf) { | |
361 | free_page((unsigned long) port->xmit_buf); | |
362 | port->xmit_buf = NULL; | |
363 | } | |
364 | ||
b5391e29 AC |
365 | if (port->port.tty) |
366 | set_bit(TTY_IO_ERROR, &port->port.tty->flags); | |
1da177e4 LT |
367 | |
368 | port->rd->shutdown_port (port); | |
369 | ||
b5391e29 | 370 | port->port.flags &= ~ASYNC_INITIALIZED; |
1da177e4 LT |
371 | spin_unlock_irqrestore(&port->driver_lock, flags); |
372 | ||
373 | func_exit(); | |
374 | } | |
375 | ||
376 | ||
377 | void gs_hangup(struct tty_struct *tty) | |
378 | { | |
379 | struct gs_port *port; | |
380 | ||
381 | func_enter (); | |
382 | ||
1da177e4 | 383 | port = tty->driver_data; |
b5391e29 | 384 | tty = port->port.tty; |
1da177e4 LT |
385 | if (!tty) |
386 | return; | |
387 | ||
388 | gs_shutdown_port (port); | |
b5391e29 AC |
389 | port->port.flags &= ~(ASYNC_NORMAL_ACTIVE|GS_ACTIVE); |
390 | port->port.tty = NULL; | |
391 | port->port.count = 0; | |
1da177e4 | 392 | |
b5391e29 | 393 | wake_up_interruptible(&port->port.open_wait); |
1da177e4 LT |
394 | func_exit (); |
395 | } | |
396 | ||
397 | ||
398 | int gs_block_til_ready(void *port_, struct file * filp) | |
399 | { | |
400 | struct gs_port *port = port_; | |
401 | DECLARE_WAITQUEUE(wait, current); | |
402 | int retval; | |
403 | int do_clocal = 0; | |
404 | int CD; | |
405 | struct tty_struct *tty; | |
406 | unsigned long flags; | |
407 | ||
408 | func_enter (); | |
409 | ||
410 | if (!port) return 0; | |
411 | ||
b5391e29 | 412 | tty = port->port.tty; |
1da177e4 | 413 | |
1da177e4 LT |
414 | gs_dprintk (GS_DEBUG_BTR, "Entering gs_block_till_ready.\n"); |
415 | /* | |
416 | * If the device is in the middle of being closed, then block | |
417 | * until it's done, and then try again. | |
418 | */ | |
b5391e29 AC |
419 | if (tty_hung_up_p(filp) || port->port.flags & ASYNC_CLOSING) { |
420 | interruptible_sleep_on(&port->port.close_wait); | |
421 | if (port->port.flags & ASYNC_HUP_NOTIFY) | |
1da177e4 LT |
422 | return -EAGAIN; |
423 | else | |
424 | return -ERESTARTSYS; | |
425 | } | |
426 | ||
427 | gs_dprintk (GS_DEBUG_BTR, "after hung up\n"); | |
428 | ||
429 | /* | |
430 | * If non-blocking mode is set, or the port is not enabled, | |
431 | * then make the check up front and then exit. | |
432 | */ | |
433 | if ((filp->f_flags & O_NONBLOCK) || | |
434 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
b5391e29 | 435 | port->port.flags |= ASYNC_NORMAL_ACTIVE; |
1da177e4 LT |
436 | return 0; |
437 | } | |
438 | ||
439 | gs_dprintk (GS_DEBUG_BTR, "after nonblock\n"); | |
440 | ||
441 | if (C_CLOCAL(tty)) | |
442 | do_clocal = 1; | |
443 | ||
444 | /* | |
445 | * Block waiting for the carrier detect and the line to become | |
446 | * free (i.e., not in use by the callout). While we are in | |
b5391e29 | 447 | * this loop, port->port.count is dropped by one, so that |
1da177e4 LT |
448 | * rs_close() knows when to free things. We restore it upon |
449 | * exit, either normal or abnormal. | |
450 | */ | |
451 | retval = 0; | |
452 | ||
b5391e29 | 453 | add_wait_queue(&port->port.open_wait, &wait); |
1da177e4 LT |
454 | |
455 | gs_dprintk (GS_DEBUG_BTR, "after add waitq.\n"); | |
456 | spin_lock_irqsave(&port->driver_lock, flags); | |
457 | if (!tty_hung_up_p(filp)) { | |
b5391e29 | 458 | port->port.count--; |
1da177e4 LT |
459 | } |
460 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
b5391e29 | 461 | port->port.blocked_open++; |
1da177e4 LT |
462 | while (1) { |
463 | CD = port->rd->get_CD (port); | |
464 | gs_dprintk (GS_DEBUG_BTR, "CD is now %d.\n", CD); | |
465 | set_current_state (TASK_INTERRUPTIBLE); | |
466 | if (tty_hung_up_p(filp) || | |
b5391e29 AC |
467 | !(port->port.flags & ASYNC_INITIALIZED)) { |
468 | if (port->port.flags & ASYNC_HUP_NOTIFY) | |
1da177e4 LT |
469 | retval = -EAGAIN; |
470 | else | |
471 | retval = -ERESTARTSYS; | |
472 | break; | |
473 | } | |
b5391e29 | 474 | if (!(port->port.flags & ASYNC_CLOSING) && |
1da177e4 LT |
475 | (do_clocal || CD)) |
476 | break; | |
477 | gs_dprintk (GS_DEBUG_BTR, "signal_pending is now: %d (%lx)\n", | |
478 | (int)signal_pending (current), *(long*)(¤t->blocked)); | |
479 | if (signal_pending(current)) { | |
480 | retval = -ERESTARTSYS; | |
481 | break; | |
482 | } | |
483 | schedule(); | |
484 | } | |
485 | gs_dprintk (GS_DEBUG_BTR, "Got out of the loop. (%d)\n", | |
b5391e29 | 486 | port->port.blocked_open); |
1da177e4 | 487 | set_current_state (TASK_RUNNING); |
b5391e29 | 488 | remove_wait_queue(&port->port.open_wait, &wait); |
1da177e4 | 489 | if (!tty_hung_up_p(filp)) { |
b5391e29 | 490 | port->port.count++; |
1da177e4 | 491 | } |
b5391e29 | 492 | port->port.blocked_open--; |
1da177e4 LT |
493 | if (retval) |
494 | return retval; | |
495 | ||
b5391e29 | 496 | port->port.flags |= ASYNC_NORMAL_ACTIVE; |
1da177e4 LT |
497 | func_exit (); |
498 | return 0; | |
499 | } | |
500 | ||
501 | ||
502 | void gs_close(struct tty_struct * tty, struct file * filp) | |
503 | { | |
504 | unsigned long flags; | |
505 | struct gs_port *port; | |
506 | ||
507 | func_enter (); | |
508 | ||
1da177e4 LT |
509 | port = (struct gs_port *) tty->driver_data; |
510 | ||
511 | if (!port) return; | |
512 | ||
b5391e29 | 513 | if (!port->port.tty) { |
1da177e4 | 514 | /* This seems to happen when this is called from vhangup. */ |
b5391e29 AC |
515 | gs_dprintk (GS_DEBUG_CLOSE, "gs: Odd: port->port.tty is NULL\n"); |
516 | port->port.tty = tty; | |
1da177e4 LT |
517 | } |
518 | ||
519 | spin_lock_irqsave(&port->driver_lock, flags); | |
520 | ||
521 | if (tty_hung_up_p(filp)) { | |
522 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
523 | if (port->rd->hungup) | |
524 | port->rd->hungup (port); | |
525 | func_exit (); | |
526 | return; | |
527 | } | |
528 | ||
b5391e29 | 529 | if ((tty->count == 1) && (port->port.count != 1)) { |
1da177e4 | 530 | printk(KERN_ERR "gs: gs_close port %p: bad port count;" |
b5391e29 AC |
531 | " tty->count is 1, port count is %d\n", port, port->port.count); |
532 | port->port.count = 1; | |
1da177e4 | 533 | } |
b5391e29 AC |
534 | if (--port->port.count < 0) { |
535 | printk(KERN_ERR "gs: gs_close port %p: bad port count: %d\n", port, port->port.count); | |
536 | port->port.count = 0; | |
1da177e4 LT |
537 | } |
538 | ||
b5391e29 AC |
539 | if (port->port.count) { |
540 | gs_dprintk(GS_DEBUG_CLOSE, "gs_close port %p: count: %d\n", port, port->port.count); | |
1da177e4 LT |
541 | spin_unlock_irqrestore(&port->driver_lock, flags); |
542 | func_exit (); | |
543 | return; | |
544 | } | |
b5391e29 | 545 | port->port.flags |= ASYNC_CLOSING; |
1da177e4 LT |
546 | |
547 | /* | |
548 | * Now we wait for the transmit buffer to clear; and we notify | |
549 | * the line discipline to only process XON/XOFF characters. | |
550 | */ | |
551 | tty->closing = 1; | |
552 | /* if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
553 | tty_wait_until_sent(tty, port->closing_wait); */ | |
554 | ||
555 | /* | |
556 | * At this point we stop accepting input. To do this, we | |
557 | * disable the receive line status interrupts, and tell the | |
558 | * interrupt driver to stop checking the data ready bit in the | |
559 | * line status register. | |
560 | */ | |
561 | ||
562 | port->rd->disable_rx_interrupts (port); | |
563 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
564 | ||
565 | /* close has no way of returning "EINTR", so discard return value */ | |
566 | if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
567 | gs_wait_tx_flushed (port, port->closing_wait); | |
568 | ||
b5391e29 | 569 | port->port.flags &= ~GS_ACTIVE; |
1da177e4 | 570 | |
978e595f | 571 | gs_flush_buffer(tty); |
1da177e4 LT |
572 | |
573 | tty_ldisc_flush(tty); | |
574 | tty->closing = 0; | |
575 | ||
576 | port->event = 0; | |
577 | port->rd->close (port); | |
578 | port->rd->shutdown_port (port); | |
b5391e29 | 579 | port->port.tty = NULL; |
1da177e4 | 580 | |
b5391e29 | 581 | if (port->port.blocked_open) { |
1da177e4 LT |
582 | if (port->close_delay) { |
583 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
584 | msleep_interruptible(jiffies_to_msecs(port->close_delay)); | |
585 | spin_lock_irqsave(&port->driver_lock, flags); | |
586 | } | |
b5391e29 | 587 | wake_up_interruptible(&port->port.open_wait); |
1da177e4 | 588 | } |
b5391e29 AC |
589 | port->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING | ASYNC_INITIALIZED); |
590 | wake_up_interruptible(&port->port.close_wait); | |
1da177e4 LT |
591 | |
592 | func_exit (); | |
593 | } | |
594 | ||
595 | ||
1da177e4 | 596 | void gs_set_termios (struct tty_struct * tty, |
606d099c | 597 | struct ktermios * old_termios) |
1da177e4 LT |
598 | { |
599 | struct gs_port *port; | |
600 | int baudrate, tmp, rv; | |
606d099c | 601 | struct ktermios *tiosp; |
1da177e4 LT |
602 | |
603 | func_enter(); | |
604 | ||
1da177e4 LT |
605 | port = tty->driver_data; |
606 | ||
607 | if (!port) return; | |
b5391e29 | 608 | if (!port->port.tty) { |
1da177e4 | 609 | /* This seems to happen when this is called after gs_close. */ |
b5391e29 AC |
610 | gs_dprintk (GS_DEBUG_TERMIOS, "gs: Odd: port->port.tty is NULL\n"); |
611 | port->port.tty = tty; | |
1da177e4 LT |
612 | } |
613 | ||
614 | ||
615 | tiosp = tty->termios; | |
616 | ||
617 | if (gs_debug & GS_DEBUG_TERMIOS) { | |
618 | gs_dprintk (GS_DEBUG_TERMIOS, "termios structure (%p):\n", tiosp); | |
619 | } | |
620 | ||
1da177e4 LT |
621 | if(old_termios && (gs_debug & GS_DEBUG_TERMIOS)) { |
622 | if(tiosp->c_iflag != old_termios->c_iflag) printk("c_iflag changed\n"); | |
623 | if(tiosp->c_oflag != old_termios->c_oflag) printk("c_oflag changed\n"); | |
624 | if(tiosp->c_cflag != old_termios->c_cflag) printk("c_cflag changed\n"); | |
625 | if(tiosp->c_lflag != old_termios->c_lflag) printk("c_lflag changed\n"); | |
626 | if(tiosp->c_line != old_termios->c_line) printk("c_line changed\n"); | |
627 | if(!memcmp(tiosp->c_cc, old_termios->c_cc, NCC)) printk("c_cc changed\n"); | |
628 | } | |
629 | ||
d720bc4b | 630 | baudrate = tty_get_baud_rate(tty); |
1da177e4 | 631 | |
1da177e4 | 632 | if ((tiosp->c_cflag & CBAUD) == B38400) { |
b5391e29 | 633 | if ( (port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) |
1da177e4 | 634 | baudrate = 57600; |
b5391e29 | 635 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) |
1da177e4 | 636 | baudrate = 115200; |
b5391e29 | 637 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) |
1da177e4 | 638 | baudrate = 230400; |
b5391e29 | 639 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) |
1da177e4 | 640 | baudrate = 460800; |
b5391e29 | 641 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) |
1da177e4 LT |
642 | baudrate = (port->baud_base / port->custom_divisor); |
643 | } | |
644 | ||
645 | /* I recommend using THIS instead of the mess in termios (and | |
646 | duplicating the above code). Next we should create a clean | |
647 | interface towards this variable. If your card supports arbitrary | |
648 | baud rates, (e.g. CD1400 or 16550 based cards) then everything | |
649 | will be very easy..... */ | |
650 | port->baud = baudrate; | |
651 | ||
652 | /* Two timer ticks seems enough to wakeup something like SLIP driver */ | |
653 | /* Baudrate/10 is cps. Divide by HZ to get chars per tick. */ | |
654 | tmp = (baudrate / 10 / HZ) * 2; | |
655 | ||
656 | if (tmp < 0) tmp = 0; | |
657 | if (tmp >= SERIAL_XMIT_SIZE) tmp = SERIAL_XMIT_SIZE-1; | |
658 | ||
659 | port->wakeup_chars = tmp; | |
660 | ||
661 | /* We should really wait for the characters to be all sent before | |
662 | changing the settings. -- CAL */ | |
663 | rv = gs_wait_tx_flushed (port, MAX_SCHEDULE_TIMEOUT); | |
664 | if (rv < 0) return /* rv */; | |
665 | ||
666 | rv = port->rd->set_real_termios(port); | |
667 | if (rv < 0) return /* rv */; | |
668 | ||
669 | if ((!old_termios || | |
670 | (old_termios->c_cflag & CRTSCTS)) && | |
671 | !( tiosp->c_cflag & CRTSCTS)) { | |
672 | tty->stopped = 0; | |
673 | gs_start(tty); | |
674 | } | |
675 | ||
676 | #ifdef tytso_patch_94Nov25_1726 | |
677 | /* This "makes sense", Why is it commented out? */ | |
678 | ||
679 | if (!(old_termios->c_cflag & CLOCAL) && | |
680 | (tty->termios->c_cflag & CLOCAL)) | |
681 | wake_up_interruptible(&port->gs.open_wait); | |
682 | #endif | |
683 | ||
684 | func_exit(); | |
685 | return /* 0 */; | |
686 | } | |
687 | ||
688 | ||
689 | ||
690 | /* Must be called with interrupts enabled */ | |
691 | int gs_init_port(struct gs_port *port) | |
692 | { | |
693 | unsigned long flags; | |
1da177e4 LT |
694 | |
695 | func_enter (); | |
696 | ||
b5391e29 | 697 | if (port->port.flags & ASYNC_INITIALIZED) { |
1da177e4 LT |
698 | func_exit (); |
699 | return 0; | |
700 | } | |
701 | if (!port->xmit_buf) { | |
702 | /* We may sleep in get_zeroed_page() */ | |
703 | unsigned long tmp; | |
704 | ||
705 | tmp = get_zeroed_page(GFP_KERNEL); | |
706 | spin_lock_irqsave (&port->driver_lock, flags); | |
707 | if (port->xmit_buf) | |
708 | free_page (tmp); | |
709 | else | |
710 | port->xmit_buf = (unsigned char *) tmp; | |
711 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
712 | if (!port->xmit_buf) { | |
713 | func_exit (); | |
714 | return -ENOMEM; | |
715 | } | |
716 | } | |
717 | ||
718 | spin_lock_irqsave (&port->driver_lock, flags); | |
b5391e29 AC |
719 | if (port->port.tty) |
720 | clear_bit(TTY_IO_ERROR, &port->port.tty->flags); | |
81861d78 | 721 | mutex_init(&port->port_write_mutex); |
1da177e4 LT |
722 | port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; |
723 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
b5391e29 | 724 | gs_set_termios(port->port.tty, NULL); |
1da177e4 | 725 | spin_lock_irqsave (&port->driver_lock, flags); |
b5391e29 AC |
726 | port->port.flags |= ASYNC_INITIALIZED; |
727 | port->port.flags &= ~GS_TX_INTEN; | |
1da177e4 LT |
728 | |
729 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
730 | func_exit (); | |
731 | return 0; | |
732 | } | |
733 | ||
734 | ||
735 | int gs_setserial(struct gs_port *port, struct serial_struct __user *sp) | |
736 | { | |
737 | struct serial_struct sio; | |
738 | ||
739 | if (copy_from_user(&sio, sp, sizeof(struct serial_struct))) | |
740 | return(-EFAULT); | |
741 | ||
742 | if (!capable(CAP_SYS_ADMIN)) { | |
743 | if ((sio.baud_base != port->baud_base) || | |
744 | (sio.close_delay != port->close_delay) || | |
745 | ((sio.flags & ~ASYNC_USR_MASK) != | |
b5391e29 | 746 | (port->port.flags & ~ASYNC_USR_MASK))) |
1da177e4 LT |
747 | return(-EPERM); |
748 | } | |
749 | ||
b5391e29 | 750 | port->port.flags = (port->port.flags & ~ASYNC_USR_MASK) | |
1da177e4 LT |
751 | (sio.flags & ASYNC_USR_MASK); |
752 | ||
753 | port->baud_base = sio.baud_base; | |
754 | port->close_delay = sio.close_delay; | |
755 | port->closing_wait = sio.closing_wait; | |
756 | port->custom_divisor = sio.custom_divisor; | |
757 | ||
b5391e29 | 758 | gs_set_termios (port->port.tty, NULL); |
1da177e4 LT |
759 | |
760 | return 0; | |
761 | } | |
762 | ||
763 | ||
764 | /*****************************************************************************/ | |
765 | ||
766 | /* | |
767 | * Generate the serial struct info. | |
768 | */ | |
769 | ||
770 | int gs_getserial(struct gs_port *port, struct serial_struct __user *sp) | |
771 | { | |
772 | struct serial_struct sio; | |
773 | ||
774 | memset(&sio, 0, sizeof(struct serial_struct)); | |
b5391e29 | 775 | sio.flags = port->port.flags; |
1da177e4 LT |
776 | sio.baud_base = port->baud_base; |
777 | sio.close_delay = port->close_delay; | |
778 | sio.closing_wait = port->closing_wait; | |
779 | sio.custom_divisor = port->custom_divisor; | |
780 | sio.hub6 = 0; | |
781 | ||
782 | /* If you want you can override these. */ | |
783 | sio.type = PORT_UNKNOWN; | |
784 | sio.xmit_fifo_size = -1; | |
785 | sio.line = -1; | |
786 | sio.port = -1; | |
787 | sio.irq = -1; | |
788 | ||
789 | if (port->rd->getserial) | |
790 | port->rd->getserial (port, &sio); | |
791 | ||
792 | if (copy_to_user(sp, &sio, sizeof(struct serial_struct))) | |
793 | return -EFAULT; | |
794 | return 0; | |
795 | ||
796 | } | |
797 | ||
798 | ||
799 | void gs_got_break(struct gs_port *port) | |
800 | { | |
801 | func_enter (); | |
802 | ||
b5391e29 AC |
803 | tty_insert_flip_char(port->port.tty, 0, TTY_BREAK); |
804 | tty_schedule_flip(port->port.tty); | |
805 | if (port->port.flags & ASYNC_SAK) { | |
806 | do_SAK (port->port.tty); | |
1da177e4 LT |
807 | } |
808 | ||
809 | func_exit (); | |
810 | } | |
811 | ||
812 | ||
813 | EXPORT_SYMBOL(gs_put_char); | |
814 | EXPORT_SYMBOL(gs_write); | |
815 | EXPORT_SYMBOL(gs_write_room); | |
816 | EXPORT_SYMBOL(gs_chars_in_buffer); | |
817 | EXPORT_SYMBOL(gs_flush_buffer); | |
818 | EXPORT_SYMBOL(gs_flush_chars); | |
819 | EXPORT_SYMBOL(gs_stop); | |
820 | EXPORT_SYMBOL(gs_start); | |
821 | EXPORT_SYMBOL(gs_hangup); | |
822 | EXPORT_SYMBOL(gs_block_til_ready); | |
823 | EXPORT_SYMBOL(gs_close); | |
824 | EXPORT_SYMBOL(gs_set_termios); | |
825 | EXPORT_SYMBOL(gs_init_port); | |
826 | EXPORT_SYMBOL(gs_setserial); | |
827 | EXPORT_SYMBOL(gs_getserial); | |
828 | EXPORT_SYMBOL(gs_got_break); | |
829 | ||
830 | MODULE_LICENSE("GPL"); |