Commit | Line | Data |
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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 | { | |
510a3049 AC |
379 | struct gs_port *port; |
380 | unsigned long flags; | |
1da177e4 LT |
381 | |
382 | func_enter (); | |
383 | ||
1da177e4 | 384 | port = tty->driver_data; |
b5391e29 | 385 | tty = port->port.tty; |
1da177e4 LT |
386 | if (!tty) |
387 | return; | |
388 | ||
389 | gs_shutdown_port (port); | |
510a3049 | 390 | spin_lock_irqsave(&port->port.lock, flags); |
b5391e29 AC |
391 | port->port.flags &= ~(ASYNC_NORMAL_ACTIVE|GS_ACTIVE); |
392 | port->port.tty = NULL; | |
393 | port->port.count = 0; | |
510a3049 | 394 | spin_unlock_irqrestore(&port->port.lock, flags); |
1da177e4 | 395 | |
b5391e29 | 396 | wake_up_interruptible(&port->port.open_wait); |
1da177e4 LT |
397 | func_exit (); |
398 | } | |
399 | ||
400 | ||
401 | int gs_block_til_ready(void *port_, struct file * filp) | |
402 | { | |
31f35939 AC |
403 | struct gs_port *gp = port_; |
404 | struct tty_port *port = &gp->port; | |
1da177e4 LT |
405 | DECLARE_WAITQUEUE(wait, current); |
406 | int retval; | |
407 | int do_clocal = 0; | |
408 | int CD; | |
409 | struct tty_struct *tty; | |
410 | unsigned long flags; | |
411 | ||
412 | func_enter (); | |
413 | ||
414 | if (!port) return 0; | |
415 | ||
31f35939 | 416 | tty = port->tty; |
1da177e4 | 417 | |
1da177e4 LT |
418 | gs_dprintk (GS_DEBUG_BTR, "Entering gs_block_till_ready.\n"); |
419 | /* | |
420 | * If the device is in the middle of being closed, then block | |
421 | * until it's done, and then try again. | |
422 | */ | |
31f35939 AC |
423 | if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) { |
424 | interruptible_sleep_on(&port->close_wait); | |
425 | if (port->flags & ASYNC_HUP_NOTIFY) | |
1da177e4 LT |
426 | return -EAGAIN; |
427 | else | |
428 | return -ERESTARTSYS; | |
429 | } | |
430 | ||
431 | gs_dprintk (GS_DEBUG_BTR, "after hung up\n"); | |
432 | ||
433 | /* | |
434 | * If non-blocking mode is set, or the port is not enabled, | |
435 | * then make the check up front and then exit. | |
436 | */ | |
437 | if ((filp->f_flags & O_NONBLOCK) || | |
438 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
31f35939 | 439 | port->flags |= ASYNC_NORMAL_ACTIVE; |
1da177e4 LT |
440 | return 0; |
441 | } | |
442 | ||
443 | gs_dprintk (GS_DEBUG_BTR, "after nonblock\n"); | |
444 | ||
445 | if (C_CLOCAL(tty)) | |
446 | do_clocal = 1; | |
447 | ||
448 | /* | |
449 | * Block waiting for the carrier detect and the line to become | |
450 | * free (i.e., not in use by the callout). While we are in | |
31f35939 | 451 | * this loop, port->count is dropped by one, so that |
1da177e4 LT |
452 | * rs_close() knows when to free things. We restore it upon |
453 | * exit, either normal or abnormal. | |
454 | */ | |
455 | retval = 0; | |
456 | ||
31f35939 | 457 | add_wait_queue(&port->open_wait, &wait); |
1da177e4 LT |
458 | |
459 | gs_dprintk (GS_DEBUG_BTR, "after add waitq.\n"); | |
510a3049 | 460 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 461 | if (!tty_hung_up_p(filp)) { |
31f35939 | 462 | port->count--; |
1da177e4 | 463 | } |
31f35939 | 464 | port->blocked_open++; |
510a3049 | 465 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 466 | while (1) { |
31f35939 | 467 | CD = tty_port_carrier_raised(port); |
1da177e4 LT |
468 | gs_dprintk (GS_DEBUG_BTR, "CD is now %d.\n", CD); |
469 | set_current_state (TASK_INTERRUPTIBLE); | |
470 | if (tty_hung_up_p(filp) || | |
31f35939 AC |
471 | !(port->flags & ASYNC_INITIALIZED)) { |
472 | if (port->flags & ASYNC_HUP_NOTIFY) | |
1da177e4 LT |
473 | retval = -EAGAIN; |
474 | else | |
475 | retval = -ERESTARTSYS; | |
476 | break; | |
477 | } | |
31f35939 | 478 | if (!(port->flags & ASYNC_CLOSING) && |
1da177e4 LT |
479 | (do_clocal || CD)) |
480 | break; | |
481 | gs_dprintk (GS_DEBUG_BTR, "signal_pending is now: %d (%lx)\n", | |
482 | (int)signal_pending (current), *(long*)(¤t->blocked)); | |
483 | if (signal_pending(current)) { | |
484 | retval = -ERESTARTSYS; | |
485 | break; | |
486 | } | |
487 | schedule(); | |
488 | } | |
489 | gs_dprintk (GS_DEBUG_BTR, "Got out of the loop. (%d)\n", | |
31f35939 | 490 | port->blocked_open); |
1da177e4 | 491 | set_current_state (TASK_RUNNING); |
31f35939 | 492 | remove_wait_queue(&port->open_wait, &wait); |
510a3049 AC |
493 | |
494 | spin_lock_irqsave(&port->lock, flags); | |
1da177e4 | 495 | if (!tty_hung_up_p(filp)) { |
31f35939 | 496 | port->count++; |
1da177e4 | 497 | } |
31f35939 | 498 | port->blocked_open--; |
510a3049 AC |
499 | if (retval == 0) |
500 | port->flags |= ASYNC_NORMAL_ACTIVE; | |
501 | spin_unlock_irqrestore(&port->lock, flags); | |
1da177e4 | 502 | func_exit (); |
510a3049 | 503 | return retval; |
1da177e4 LT |
504 | } |
505 | ||
506 | ||
507 | void gs_close(struct tty_struct * tty, struct file * filp) | |
508 | { | |
509 | unsigned long flags; | |
510 | struct gs_port *port; | |
511 | ||
512 | func_enter (); | |
513 | ||
c9f19e96 | 514 | port = tty->driver_data; |
1da177e4 LT |
515 | |
516 | if (!port) return; | |
517 | ||
b5391e29 | 518 | if (!port->port.tty) { |
1da177e4 | 519 | /* This seems to happen when this is called from vhangup. */ |
b5391e29 AC |
520 | gs_dprintk (GS_DEBUG_CLOSE, "gs: Odd: port->port.tty is NULL\n"); |
521 | port->port.tty = tty; | |
1da177e4 LT |
522 | } |
523 | ||
510a3049 | 524 | spin_lock_irqsave(&port->port.lock, flags); |
1da177e4 LT |
525 | |
526 | if (tty_hung_up_p(filp)) { | |
510a3049 | 527 | spin_unlock_irqrestore(&port->port.lock, flags); |
1da177e4 LT |
528 | if (port->rd->hungup) |
529 | port->rd->hungup (port); | |
530 | func_exit (); | |
531 | return; | |
532 | } | |
533 | ||
b5391e29 | 534 | if ((tty->count == 1) && (port->port.count != 1)) { |
1da177e4 | 535 | printk(KERN_ERR "gs: gs_close port %p: bad port count;" |
b5391e29 AC |
536 | " tty->count is 1, port count is %d\n", port, port->port.count); |
537 | port->port.count = 1; | |
1da177e4 | 538 | } |
b5391e29 AC |
539 | if (--port->port.count < 0) { |
540 | printk(KERN_ERR "gs: gs_close port %p: bad port count: %d\n", port, port->port.count); | |
541 | port->port.count = 0; | |
1da177e4 LT |
542 | } |
543 | ||
b5391e29 AC |
544 | if (port->port.count) { |
545 | gs_dprintk(GS_DEBUG_CLOSE, "gs_close port %p: count: %d\n", port, port->port.count); | |
510a3049 | 546 | spin_unlock_irqrestore(&port->port.lock, flags); |
1da177e4 LT |
547 | func_exit (); |
548 | return; | |
549 | } | |
b5391e29 | 550 | port->port.flags |= ASYNC_CLOSING; |
1da177e4 LT |
551 | |
552 | /* | |
553 | * Now we wait for the transmit buffer to clear; and we notify | |
554 | * the line discipline to only process XON/XOFF characters. | |
555 | */ | |
556 | tty->closing = 1; | |
557 | /* if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
558 | tty_wait_until_sent(tty, port->closing_wait); */ | |
559 | ||
560 | /* | |
561 | * At this point we stop accepting input. To do this, we | |
562 | * disable the receive line status interrupts, and tell the | |
563 | * interrupt driver to stop checking the data ready bit in the | |
564 | * line status register. | |
565 | */ | |
566 | ||
510a3049 | 567 | spin_lock_irqsave(&port->driver_lock, flags); |
1da177e4 LT |
568 | port->rd->disable_rx_interrupts (port); |
569 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
510a3049 | 570 | spin_unlock_irqrestore(&port->port.lock, flags); |
1da177e4 LT |
571 | |
572 | /* close has no way of returning "EINTR", so discard return value */ | |
573 | if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
574 | gs_wait_tx_flushed (port, port->closing_wait); | |
575 | ||
b5391e29 | 576 | port->port.flags &= ~GS_ACTIVE; |
1da177e4 | 577 | |
978e595f | 578 | gs_flush_buffer(tty); |
1da177e4 LT |
579 | |
580 | tty_ldisc_flush(tty); | |
581 | tty->closing = 0; | |
582 | ||
510a3049 | 583 | spin_lock_irqsave(&port->driver_lock, flags); |
1da177e4 LT |
584 | port->event = 0; |
585 | port->rd->close (port); | |
586 | port->rd->shutdown_port (port); | |
510a3049 AC |
587 | spin_unlock_irqrestore(&port->driver_lock, flags); |
588 | ||
589 | spin_lock_irqsave(&port->port.lock, flags); | |
b5391e29 | 590 | port->port.tty = NULL; |
1da177e4 | 591 | |
b5391e29 | 592 | if (port->port.blocked_open) { |
1da177e4 | 593 | if (port->close_delay) { |
510a3049 | 594 | spin_unlock_irqrestore(&port->port.lock, flags); |
1da177e4 | 595 | msleep_interruptible(jiffies_to_msecs(port->close_delay)); |
510a3049 | 596 | spin_lock_irqsave(&port->port.lock, flags); |
1da177e4 | 597 | } |
b5391e29 | 598 | wake_up_interruptible(&port->port.open_wait); |
1da177e4 | 599 | } |
b5391e29 | 600 | port->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING | ASYNC_INITIALIZED); |
510a3049 | 601 | spin_unlock_irqrestore(&port->port.lock, flags); |
b5391e29 | 602 | wake_up_interruptible(&port->port.close_wait); |
1da177e4 LT |
603 | |
604 | func_exit (); | |
605 | } | |
606 | ||
607 | ||
1da177e4 | 608 | void gs_set_termios (struct tty_struct * tty, |
606d099c | 609 | struct ktermios * old_termios) |
1da177e4 LT |
610 | { |
611 | struct gs_port *port; | |
612 | int baudrate, tmp, rv; | |
606d099c | 613 | struct ktermios *tiosp; |
1da177e4 LT |
614 | |
615 | func_enter(); | |
616 | ||
1da177e4 LT |
617 | port = tty->driver_data; |
618 | ||
619 | if (!port) return; | |
b5391e29 | 620 | if (!port->port.tty) { |
1da177e4 | 621 | /* This seems to happen when this is called after gs_close. */ |
b5391e29 AC |
622 | gs_dprintk (GS_DEBUG_TERMIOS, "gs: Odd: port->port.tty is NULL\n"); |
623 | port->port.tty = tty; | |
1da177e4 LT |
624 | } |
625 | ||
626 | ||
627 | tiosp = tty->termios; | |
628 | ||
629 | if (gs_debug & GS_DEBUG_TERMIOS) { | |
630 | gs_dprintk (GS_DEBUG_TERMIOS, "termios structure (%p):\n", tiosp); | |
631 | } | |
632 | ||
1da177e4 LT |
633 | if(old_termios && (gs_debug & GS_DEBUG_TERMIOS)) { |
634 | if(tiosp->c_iflag != old_termios->c_iflag) printk("c_iflag changed\n"); | |
635 | if(tiosp->c_oflag != old_termios->c_oflag) printk("c_oflag changed\n"); | |
636 | if(tiosp->c_cflag != old_termios->c_cflag) printk("c_cflag changed\n"); | |
637 | if(tiosp->c_lflag != old_termios->c_lflag) printk("c_lflag changed\n"); | |
638 | if(tiosp->c_line != old_termios->c_line) printk("c_line changed\n"); | |
639 | if(!memcmp(tiosp->c_cc, old_termios->c_cc, NCC)) printk("c_cc changed\n"); | |
640 | } | |
641 | ||
d720bc4b | 642 | baudrate = tty_get_baud_rate(tty); |
1da177e4 | 643 | |
1da177e4 | 644 | if ((tiosp->c_cflag & CBAUD) == B38400) { |
b5391e29 | 645 | if ( (port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) |
1da177e4 | 646 | baudrate = 57600; |
b5391e29 | 647 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) |
1da177e4 | 648 | baudrate = 115200; |
b5391e29 | 649 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) |
1da177e4 | 650 | baudrate = 230400; |
b5391e29 | 651 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) |
1da177e4 | 652 | baudrate = 460800; |
b5391e29 | 653 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) |
1da177e4 LT |
654 | baudrate = (port->baud_base / port->custom_divisor); |
655 | } | |
656 | ||
657 | /* I recommend using THIS instead of the mess in termios (and | |
658 | duplicating the above code). Next we should create a clean | |
659 | interface towards this variable. If your card supports arbitrary | |
660 | baud rates, (e.g. CD1400 or 16550 based cards) then everything | |
661 | will be very easy..... */ | |
662 | port->baud = baudrate; | |
663 | ||
664 | /* Two timer ticks seems enough to wakeup something like SLIP driver */ | |
665 | /* Baudrate/10 is cps. Divide by HZ to get chars per tick. */ | |
666 | tmp = (baudrate / 10 / HZ) * 2; | |
667 | ||
668 | if (tmp < 0) tmp = 0; | |
669 | if (tmp >= SERIAL_XMIT_SIZE) tmp = SERIAL_XMIT_SIZE-1; | |
670 | ||
671 | port->wakeup_chars = tmp; | |
672 | ||
673 | /* We should really wait for the characters to be all sent before | |
674 | changing the settings. -- CAL */ | |
675 | rv = gs_wait_tx_flushed (port, MAX_SCHEDULE_TIMEOUT); | |
676 | if (rv < 0) return /* rv */; | |
677 | ||
678 | rv = port->rd->set_real_termios(port); | |
679 | if (rv < 0) return /* rv */; | |
680 | ||
681 | if ((!old_termios || | |
682 | (old_termios->c_cflag & CRTSCTS)) && | |
683 | !( tiosp->c_cflag & CRTSCTS)) { | |
684 | tty->stopped = 0; | |
685 | gs_start(tty); | |
686 | } | |
687 | ||
688 | #ifdef tytso_patch_94Nov25_1726 | |
689 | /* This "makes sense", Why is it commented out? */ | |
690 | ||
691 | if (!(old_termios->c_cflag & CLOCAL) && | |
692 | (tty->termios->c_cflag & CLOCAL)) | |
693 | wake_up_interruptible(&port->gs.open_wait); | |
694 | #endif | |
695 | ||
696 | func_exit(); | |
697 | return /* 0 */; | |
698 | } | |
699 | ||
700 | ||
701 | ||
702 | /* Must be called with interrupts enabled */ | |
703 | int gs_init_port(struct gs_port *port) | |
704 | { | |
705 | unsigned long flags; | |
1da177e4 LT |
706 | |
707 | func_enter (); | |
708 | ||
b5391e29 | 709 | if (port->port.flags & ASYNC_INITIALIZED) { |
1da177e4 LT |
710 | func_exit (); |
711 | return 0; | |
712 | } | |
713 | if (!port->xmit_buf) { | |
714 | /* We may sleep in get_zeroed_page() */ | |
715 | unsigned long tmp; | |
716 | ||
717 | tmp = get_zeroed_page(GFP_KERNEL); | |
718 | spin_lock_irqsave (&port->driver_lock, flags); | |
719 | if (port->xmit_buf) | |
720 | free_page (tmp); | |
721 | else | |
722 | port->xmit_buf = (unsigned char *) tmp; | |
723 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
724 | if (!port->xmit_buf) { | |
725 | func_exit (); | |
726 | return -ENOMEM; | |
727 | } | |
728 | } | |
729 | ||
730 | spin_lock_irqsave (&port->driver_lock, flags); | |
b5391e29 AC |
731 | if (port->port.tty) |
732 | clear_bit(TTY_IO_ERROR, &port->port.tty->flags); | |
81861d78 | 733 | mutex_init(&port->port_write_mutex); |
1da177e4 LT |
734 | port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; |
735 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
b5391e29 | 736 | gs_set_termios(port->port.tty, NULL); |
1da177e4 | 737 | spin_lock_irqsave (&port->driver_lock, flags); |
b5391e29 AC |
738 | port->port.flags |= ASYNC_INITIALIZED; |
739 | port->port.flags &= ~GS_TX_INTEN; | |
1da177e4 LT |
740 | |
741 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
742 | func_exit (); | |
743 | return 0; | |
744 | } | |
745 | ||
746 | ||
747 | int gs_setserial(struct gs_port *port, struct serial_struct __user *sp) | |
748 | { | |
749 | struct serial_struct sio; | |
750 | ||
751 | if (copy_from_user(&sio, sp, sizeof(struct serial_struct))) | |
752 | return(-EFAULT); | |
753 | ||
754 | if (!capable(CAP_SYS_ADMIN)) { | |
755 | if ((sio.baud_base != port->baud_base) || | |
756 | (sio.close_delay != port->close_delay) || | |
757 | ((sio.flags & ~ASYNC_USR_MASK) != | |
b5391e29 | 758 | (port->port.flags & ~ASYNC_USR_MASK))) |
1da177e4 LT |
759 | return(-EPERM); |
760 | } | |
761 | ||
b5391e29 | 762 | port->port.flags = (port->port.flags & ~ASYNC_USR_MASK) | |
1da177e4 LT |
763 | (sio.flags & ASYNC_USR_MASK); |
764 | ||
765 | port->baud_base = sio.baud_base; | |
766 | port->close_delay = sio.close_delay; | |
767 | port->closing_wait = sio.closing_wait; | |
768 | port->custom_divisor = sio.custom_divisor; | |
769 | ||
b5391e29 | 770 | gs_set_termios (port->port.tty, NULL); |
1da177e4 LT |
771 | |
772 | return 0; | |
773 | } | |
774 | ||
775 | ||
776 | /*****************************************************************************/ | |
777 | ||
778 | /* | |
779 | * Generate the serial struct info. | |
780 | */ | |
781 | ||
782 | int gs_getserial(struct gs_port *port, struct serial_struct __user *sp) | |
783 | { | |
784 | struct serial_struct sio; | |
785 | ||
786 | memset(&sio, 0, sizeof(struct serial_struct)); | |
b5391e29 | 787 | sio.flags = port->port.flags; |
1da177e4 LT |
788 | sio.baud_base = port->baud_base; |
789 | sio.close_delay = port->close_delay; | |
790 | sio.closing_wait = port->closing_wait; | |
791 | sio.custom_divisor = port->custom_divisor; | |
792 | sio.hub6 = 0; | |
793 | ||
794 | /* If you want you can override these. */ | |
795 | sio.type = PORT_UNKNOWN; | |
796 | sio.xmit_fifo_size = -1; | |
797 | sio.line = -1; | |
798 | sio.port = -1; | |
799 | sio.irq = -1; | |
800 | ||
801 | if (port->rd->getserial) | |
802 | port->rd->getserial (port, &sio); | |
803 | ||
804 | if (copy_to_user(sp, &sio, sizeof(struct serial_struct))) | |
805 | return -EFAULT; | |
806 | return 0; | |
807 | ||
808 | } | |
809 | ||
810 | ||
811 | void gs_got_break(struct gs_port *port) | |
812 | { | |
813 | func_enter (); | |
814 | ||
b5391e29 AC |
815 | tty_insert_flip_char(port->port.tty, 0, TTY_BREAK); |
816 | tty_schedule_flip(port->port.tty); | |
817 | if (port->port.flags & ASYNC_SAK) { | |
818 | do_SAK (port->port.tty); | |
1da177e4 LT |
819 | } |
820 | ||
821 | func_exit (); | |
822 | } | |
823 | ||
824 | ||
825 | EXPORT_SYMBOL(gs_put_char); | |
826 | EXPORT_SYMBOL(gs_write); | |
827 | EXPORT_SYMBOL(gs_write_room); | |
828 | EXPORT_SYMBOL(gs_chars_in_buffer); | |
829 | EXPORT_SYMBOL(gs_flush_buffer); | |
830 | EXPORT_SYMBOL(gs_flush_chars); | |
831 | EXPORT_SYMBOL(gs_stop); | |
832 | EXPORT_SYMBOL(gs_start); | |
833 | EXPORT_SYMBOL(gs_hangup); | |
834 | EXPORT_SYMBOL(gs_block_til_ready); | |
835 | EXPORT_SYMBOL(gs_close); | |
836 | EXPORT_SYMBOL(gs_set_termios); | |
837 | EXPORT_SYMBOL(gs_init_port); | |
838 | EXPORT_SYMBOL(gs_setserial); | |
839 | EXPORT_SYMBOL(gs_getserial); | |
840 | EXPORT_SYMBOL(gs_got_break); | |
841 | ||
842 | MODULE_LICENSE("GPL"); |