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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 | { | |
31f35939 AC |
400 | struct gs_port *gp = port_; |
401 | struct tty_port *port = &gp->port; | |
1da177e4 LT |
402 | DECLARE_WAITQUEUE(wait, current); |
403 | int retval; | |
404 | int do_clocal = 0; | |
405 | int CD; | |
406 | struct tty_struct *tty; | |
407 | unsigned long flags; | |
408 | ||
409 | func_enter (); | |
410 | ||
411 | if (!port) return 0; | |
412 | ||
31f35939 | 413 | tty = port->tty; |
1da177e4 | 414 | |
1da177e4 LT |
415 | gs_dprintk (GS_DEBUG_BTR, "Entering gs_block_till_ready.\n"); |
416 | /* | |
417 | * If the device is in the middle of being closed, then block | |
418 | * until it's done, and then try again. | |
419 | */ | |
31f35939 AC |
420 | if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) { |
421 | interruptible_sleep_on(&port->close_wait); | |
422 | if (port->flags & ASYNC_HUP_NOTIFY) | |
1da177e4 LT |
423 | return -EAGAIN; |
424 | else | |
425 | return -ERESTARTSYS; | |
426 | } | |
427 | ||
428 | gs_dprintk (GS_DEBUG_BTR, "after hung up\n"); | |
429 | ||
430 | /* | |
431 | * If non-blocking mode is set, or the port is not enabled, | |
432 | * then make the check up front and then exit. | |
433 | */ | |
434 | if ((filp->f_flags & O_NONBLOCK) || | |
435 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
31f35939 | 436 | port->flags |= ASYNC_NORMAL_ACTIVE; |
1da177e4 LT |
437 | return 0; |
438 | } | |
439 | ||
440 | gs_dprintk (GS_DEBUG_BTR, "after nonblock\n"); | |
441 | ||
442 | if (C_CLOCAL(tty)) | |
443 | do_clocal = 1; | |
444 | ||
445 | /* | |
446 | * Block waiting for the carrier detect and the line to become | |
447 | * free (i.e., not in use by the callout). While we are in | |
31f35939 | 448 | * this loop, port->count is dropped by one, so that |
1da177e4 LT |
449 | * rs_close() knows when to free things. We restore it upon |
450 | * exit, either normal or abnormal. | |
451 | */ | |
452 | retval = 0; | |
453 | ||
31f35939 | 454 | add_wait_queue(&port->open_wait, &wait); |
1da177e4 LT |
455 | |
456 | gs_dprintk (GS_DEBUG_BTR, "after add waitq.\n"); | |
31f35939 | 457 | spin_lock_irqsave(&gp->driver_lock, flags); |
1da177e4 | 458 | if (!tty_hung_up_p(filp)) { |
31f35939 | 459 | port->count--; |
1da177e4 | 460 | } |
31f35939 AC |
461 | spin_unlock_irqrestore(&gp->driver_lock, flags); |
462 | port->blocked_open++; | |
1da177e4 | 463 | while (1) { |
31f35939 | 464 | CD = tty_port_carrier_raised(port); |
1da177e4 LT |
465 | gs_dprintk (GS_DEBUG_BTR, "CD is now %d.\n", CD); |
466 | set_current_state (TASK_INTERRUPTIBLE); | |
467 | if (tty_hung_up_p(filp) || | |
31f35939 AC |
468 | !(port->flags & ASYNC_INITIALIZED)) { |
469 | if (port->flags & ASYNC_HUP_NOTIFY) | |
1da177e4 LT |
470 | retval = -EAGAIN; |
471 | else | |
472 | retval = -ERESTARTSYS; | |
473 | break; | |
474 | } | |
31f35939 | 475 | if (!(port->flags & ASYNC_CLOSING) && |
1da177e4 LT |
476 | (do_clocal || CD)) |
477 | break; | |
478 | gs_dprintk (GS_DEBUG_BTR, "signal_pending is now: %d (%lx)\n", | |
479 | (int)signal_pending (current), *(long*)(¤t->blocked)); | |
480 | if (signal_pending(current)) { | |
481 | retval = -ERESTARTSYS; | |
482 | break; | |
483 | } | |
484 | schedule(); | |
485 | } | |
486 | gs_dprintk (GS_DEBUG_BTR, "Got out of the loop. (%d)\n", | |
31f35939 | 487 | port->blocked_open); |
1da177e4 | 488 | set_current_state (TASK_RUNNING); |
31f35939 | 489 | remove_wait_queue(&port->open_wait, &wait); |
1da177e4 | 490 | if (!tty_hung_up_p(filp)) { |
31f35939 | 491 | port->count++; |
1da177e4 | 492 | } |
31f35939 | 493 | port->blocked_open--; |
1da177e4 LT |
494 | if (retval) |
495 | return retval; | |
496 | ||
31f35939 | 497 | port->flags |= ASYNC_NORMAL_ACTIVE; |
1da177e4 LT |
498 | func_exit (); |
499 | return 0; | |
500 | } | |
501 | ||
502 | ||
503 | void gs_close(struct tty_struct * tty, struct file * filp) | |
504 | { | |
505 | unsigned long flags; | |
506 | struct gs_port *port; | |
507 | ||
508 | func_enter (); | |
509 | ||
1da177e4 LT |
510 | port = (struct gs_port *) tty->driver_data; |
511 | ||
512 | if (!port) return; | |
513 | ||
b5391e29 | 514 | if (!port->port.tty) { |
1da177e4 | 515 | /* This seems to happen when this is called from vhangup. */ |
b5391e29 AC |
516 | gs_dprintk (GS_DEBUG_CLOSE, "gs: Odd: port->port.tty is NULL\n"); |
517 | port->port.tty = tty; | |
1da177e4 LT |
518 | } |
519 | ||
520 | spin_lock_irqsave(&port->driver_lock, flags); | |
521 | ||
522 | if (tty_hung_up_p(filp)) { | |
523 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
524 | if (port->rd->hungup) | |
525 | port->rd->hungup (port); | |
526 | func_exit (); | |
527 | return; | |
528 | } | |
529 | ||
b5391e29 | 530 | if ((tty->count == 1) && (port->port.count != 1)) { |
1da177e4 | 531 | printk(KERN_ERR "gs: gs_close port %p: bad port count;" |
b5391e29 AC |
532 | " tty->count is 1, port count is %d\n", port, port->port.count); |
533 | port->port.count = 1; | |
1da177e4 | 534 | } |
b5391e29 AC |
535 | if (--port->port.count < 0) { |
536 | printk(KERN_ERR "gs: gs_close port %p: bad port count: %d\n", port, port->port.count); | |
537 | port->port.count = 0; | |
1da177e4 LT |
538 | } |
539 | ||
b5391e29 AC |
540 | if (port->port.count) { |
541 | gs_dprintk(GS_DEBUG_CLOSE, "gs_close port %p: count: %d\n", port, port->port.count); | |
1da177e4 LT |
542 | spin_unlock_irqrestore(&port->driver_lock, flags); |
543 | func_exit (); | |
544 | return; | |
545 | } | |
b5391e29 | 546 | port->port.flags |= ASYNC_CLOSING; |
1da177e4 LT |
547 | |
548 | /* | |
549 | * Now we wait for the transmit buffer to clear; and we notify | |
550 | * the line discipline to only process XON/XOFF characters. | |
551 | */ | |
552 | tty->closing = 1; | |
553 | /* if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
554 | tty_wait_until_sent(tty, port->closing_wait); */ | |
555 | ||
556 | /* | |
557 | * At this point we stop accepting input. To do this, we | |
558 | * disable the receive line status interrupts, and tell the | |
559 | * interrupt driver to stop checking the data ready bit in the | |
560 | * line status register. | |
561 | */ | |
562 | ||
563 | port->rd->disable_rx_interrupts (port); | |
564 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
565 | ||
566 | /* close has no way of returning "EINTR", so discard return value */ | |
567 | if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
568 | gs_wait_tx_flushed (port, port->closing_wait); | |
569 | ||
b5391e29 | 570 | port->port.flags &= ~GS_ACTIVE; |
1da177e4 | 571 | |
978e595f | 572 | gs_flush_buffer(tty); |
1da177e4 LT |
573 | |
574 | tty_ldisc_flush(tty); | |
575 | tty->closing = 0; | |
576 | ||
577 | port->event = 0; | |
578 | port->rd->close (port); | |
579 | port->rd->shutdown_port (port); | |
b5391e29 | 580 | port->port.tty = NULL; |
1da177e4 | 581 | |
b5391e29 | 582 | if (port->port.blocked_open) { |
1da177e4 LT |
583 | if (port->close_delay) { |
584 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
585 | msleep_interruptible(jiffies_to_msecs(port->close_delay)); | |
586 | spin_lock_irqsave(&port->driver_lock, flags); | |
587 | } | |
b5391e29 | 588 | wake_up_interruptible(&port->port.open_wait); |
1da177e4 | 589 | } |
b5391e29 AC |
590 | port->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING | ASYNC_INITIALIZED); |
591 | wake_up_interruptible(&port->port.close_wait); | |
1da177e4 LT |
592 | |
593 | func_exit (); | |
594 | } | |
595 | ||
596 | ||
1da177e4 | 597 | void gs_set_termios (struct tty_struct * tty, |
606d099c | 598 | struct ktermios * old_termios) |
1da177e4 LT |
599 | { |
600 | struct gs_port *port; | |
601 | int baudrate, tmp, rv; | |
606d099c | 602 | struct ktermios *tiosp; |
1da177e4 LT |
603 | |
604 | func_enter(); | |
605 | ||
1da177e4 LT |
606 | port = tty->driver_data; |
607 | ||
608 | if (!port) return; | |
b5391e29 | 609 | if (!port->port.tty) { |
1da177e4 | 610 | /* This seems to happen when this is called after gs_close. */ |
b5391e29 AC |
611 | gs_dprintk (GS_DEBUG_TERMIOS, "gs: Odd: port->port.tty is NULL\n"); |
612 | port->port.tty = tty; | |
1da177e4 LT |
613 | } |
614 | ||
615 | ||
616 | tiosp = tty->termios; | |
617 | ||
618 | if (gs_debug & GS_DEBUG_TERMIOS) { | |
619 | gs_dprintk (GS_DEBUG_TERMIOS, "termios structure (%p):\n", tiosp); | |
620 | } | |
621 | ||
1da177e4 LT |
622 | if(old_termios && (gs_debug & GS_DEBUG_TERMIOS)) { |
623 | if(tiosp->c_iflag != old_termios->c_iflag) printk("c_iflag changed\n"); | |
624 | if(tiosp->c_oflag != old_termios->c_oflag) printk("c_oflag changed\n"); | |
625 | if(tiosp->c_cflag != old_termios->c_cflag) printk("c_cflag changed\n"); | |
626 | if(tiosp->c_lflag != old_termios->c_lflag) printk("c_lflag changed\n"); | |
627 | if(tiosp->c_line != old_termios->c_line) printk("c_line changed\n"); | |
628 | if(!memcmp(tiosp->c_cc, old_termios->c_cc, NCC)) printk("c_cc changed\n"); | |
629 | } | |
630 | ||
d720bc4b | 631 | baudrate = tty_get_baud_rate(tty); |
1da177e4 | 632 | |
1da177e4 | 633 | if ((tiosp->c_cflag & CBAUD) == B38400) { |
b5391e29 | 634 | if ( (port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) |
1da177e4 | 635 | baudrate = 57600; |
b5391e29 | 636 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) |
1da177e4 | 637 | baudrate = 115200; |
b5391e29 | 638 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) |
1da177e4 | 639 | baudrate = 230400; |
b5391e29 | 640 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) |
1da177e4 | 641 | baudrate = 460800; |
b5391e29 | 642 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) |
1da177e4 LT |
643 | baudrate = (port->baud_base / port->custom_divisor); |
644 | } | |
645 | ||
646 | /* I recommend using THIS instead of the mess in termios (and | |
647 | duplicating the above code). Next we should create a clean | |
648 | interface towards this variable. If your card supports arbitrary | |
649 | baud rates, (e.g. CD1400 or 16550 based cards) then everything | |
650 | will be very easy..... */ | |
651 | port->baud = baudrate; | |
652 | ||
653 | /* Two timer ticks seems enough to wakeup something like SLIP driver */ | |
654 | /* Baudrate/10 is cps. Divide by HZ to get chars per tick. */ | |
655 | tmp = (baudrate / 10 / HZ) * 2; | |
656 | ||
657 | if (tmp < 0) tmp = 0; | |
658 | if (tmp >= SERIAL_XMIT_SIZE) tmp = SERIAL_XMIT_SIZE-1; | |
659 | ||
660 | port->wakeup_chars = tmp; | |
661 | ||
662 | /* We should really wait for the characters to be all sent before | |
663 | changing the settings. -- CAL */ | |
664 | rv = gs_wait_tx_flushed (port, MAX_SCHEDULE_TIMEOUT); | |
665 | if (rv < 0) return /* rv */; | |
666 | ||
667 | rv = port->rd->set_real_termios(port); | |
668 | if (rv < 0) return /* rv */; | |
669 | ||
670 | if ((!old_termios || | |
671 | (old_termios->c_cflag & CRTSCTS)) && | |
672 | !( tiosp->c_cflag & CRTSCTS)) { | |
673 | tty->stopped = 0; | |
674 | gs_start(tty); | |
675 | } | |
676 | ||
677 | #ifdef tytso_patch_94Nov25_1726 | |
678 | /* This "makes sense", Why is it commented out? */ | |
679 | ||
680 | if (!(old_termios->c_cflag & CLOCAL) && | |
681 | (tty->termios->c_cflag & CLOCAL)) | |
682 | wake_up_interruptible(&port->gs.open_wait); | |
683 | #endif | |
684 | ||
685 | func_exit(); | |
686 | return /* 0 */; | |
687 | } | |
688 | ||
689 | ||
690 | ||
691 | /* Must be called with interrupts enabled */ | |
692 | int gs_init_port(struct gs_port *port) | |
693 | { | |
694 | unsigned long flags; | |
1da177e4 LT |
695 | |
696 | func_enter (); | |
697 | ||
b5391e29 | 698 | if (port->port.flags & ASYNC_INITIALIZED) { |
1da177e4 LT |
699 | func_exit (); |
700 | return 0; | |
701 | } | |
702 | if (!port->xmit_buf) { | |
703 | /* We may sleep in get_zeroed_page() */ | |
704 | unsigned long tmp; | |
705 | ||
706 | tmp = get_zeroed_page(GFP_KERNEL); | |
707 | spin_lock_irqsave (&port->driver_lock, flags); | |
708 | if (port->xmit_buf) | |
709 | free_page (tmp); | |
710 | else | |
711 | port->xmit_buf = (unsigned char *) tmp; | |
712 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
713 | if (!port->xmit_buf) { | |
714 | func_exit (); | |
715 | return -ENOMEM; | |
716 | } | |
717 | } | |
718 | ||
719 | spin_lock_irqsave (&port->driver_lock, flags); | |
b5391e29 AC |
720 | if (port->port.tty) |
721 | clear_bit(TTY_IO_ERROR, &port->port.tty->flags); | |
81861d78 | 722 | mutex_init(&port->port_write_mutex); |
1da177e4 LT |
723 | port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; |
724 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
b5391e29 | 725 | gs_set_termios(port->port.tty, NULL); |
1da177e4 | 726 | spin_lock_irqsave (&port->driver_lock, flags); |
b5391e29 AC |
727 | port->port.flags |= ASYNC_INITIALIZED; |
728 | port->port.flags &= ~GS_TX_INTEN; | |
1da177e4 LT |
729 | |
730 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
731 | func_exit (); | |
732 | return 0; | |
733 | } | |
734 | ||
735 | ||
736 | int gs_setserial(struct gs_port *port, struct serial_struct __user *sp) | |
737 | { | |
738 | struct serial_struct sio; | |
739 | ||
740 | if (copy_from_user(&sio, sp, sizeof(struct serial_struct))) | |
741 | return(-EFAULT); | |
742 | ||
743 | if (!capable(CAP_SYS_ADMIN)) { | |
744 | if ((sio.baud_base != port->baud_base) || | |
745 | (sio.close_delay != port->close_delay) || | |
746 | ((sio.flags & ~ASYNC_USR_MASK) != | |
b5391e29 | 747 | (port->port.flags & ~ASYNC_USR_MASK))) |
1da177e4 LT |
748 | return(-EPERM); |
749 | } | |
750 | ||
b5391e29 | 751 | port->port.flags = (port->port.flags & ~ASYNC_USR_MASK) | |
1da177e4 LT |
752 | (sio.flags & ASYNC_USR_MASK); |
753 | ||
754 | port->baud_base = sio.baud_base; | |
755 | port->close_delay = sio.close_delay; | |
756 | port->closing_wait = sio.closing_wait; | |
757 | port->custom_divisor = sio.custom_divisor; | |
758 | ||
b5391e29 | 759 | gs_set_termios (port->port.tty, NULL); |
1da177e4 LT |
760 | |
761 | return 0; | |
762 | } | |
763 | ||
764 | ||
765 | /*****************************************************************************/ | |
766 | ||
767 | /* | |
768 | * Generate the serial struct info. | |
769 | */ | |
770 | ||
771 | int gs_getserial(struct gs_port *port, struct serial_struct __user *sp) | |
772 | { | |
773 | struct serial_struct sio; | |
774 | ||
775 | memset(&sio, 0, sizeof(struct serial_struct)); | |
b5391e29 | 776 | sio.flags = port->port.flags; |
1da177e4 LT |
777 | sio.baud_base = port->baud_base; |
778 | sio.close_delay = port->close_delay; | |
779 | sio.closing_wait = port->closing_wait; | |
780 | sio.custom_divisor = port->custom_divisor; | |
781 | sio.hub6 = 0; | |
782 | ||
783 | /* If you want you can override these. */ | |
784 | sio.type = PORT_UNKNOWN; | |
785 | sio.xmit_fifo_size = -1; | |
786 | sio.line = -1; | |
787 | sio.port = -1; | |
788 | sio.irq = -1; | |
789 | ||
790 | if (port->rd->getserial) | |
791 | port->rd->getserial (port, &sio); | |
792 | ||
793 | if (copy_to_user(sp, &sio, sizeof(struct serial_struct))) | |
794 | return -EFAULT; | |
795 | return 0; | |
796 | ||
797 | } | |
798 | ||
799 | ||
800 | void gs_got_break(struct gs_port *port) | |
801 | { | |
802 | func_enter (); | |
803 | ||
b5391e29 AC |
804 | tty_insert_flip_char(port->port.tty, 0, TTY_BREAK); |
805 | tty_schedule_flip(port->port.tty); | |
806 | if (port->port.flags & ASYNC_SAK) { | |
807 | do_SAK (port->port.tty); | |
1da177e4 LT |
808 | } |
809 | ||
810 | func_exit (); | |
811 | } | |
812 | ||
813 | ||
814 | EXPORT_SYMBOL(gs_put_char); | |
815 | EXPORT_SYMBOL(gs_write); | |
816 | EXPORT_SYMBOL(gs_write_room); | |
817 | EXPORT_SYMBOL(gs_chars_in_buffer); | |
818 | EXPORT_SYMBOL(gs_flush_buffer); | |
819 | EXPORT_SYMBOL(gs_flush_chars); | |
820 | EXPORT_SYMBOL(gs_stop); | |
821 | EXPORT_SYMBOL(gs_start); | |
822 | EXPORT_SYMBOL(gs_hangup); | |
823 | EXPORT_SYMBOL(gs_block_til_ready); | |
824 | EXPORT_SYMBOL(gs_close); | |
825 | EXPORT_SYMBOL(gs_set_termios); | |
826 | EXPORT_SYMBOL(gs_init_port); | |
827 | EXPORT_SYMBOL(gs_setserial); | |
828 | EXPORT_SYMBOL(gs_getserial); | |
829 | EXPORT_SYMBOL(gs_got_break); | |
830 | ||
831 | MODULE_LICENSE("GPL"); |