Commit | Line | Data |
---|---|---|
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> | |
d43c36dc | 25 | #include <linux/sched.h> |
1da177e4 LT |
26 | #include <linux/serial.h> |
27 | #include <linux/mm.h> | |
28 | #include <linux/generic_serial.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/tty_flip.h> | |
31 | #include <linux/delay.h> | |
1da177e4 LT |
32 | #include <asm/uaccess.h> |
33 | ||
34 | #define DEBUG | |
35 | ||
1da177e4 LT |
36 | static int gs_debug; |
37 | ||
38 | #ifdef DEBUG | |
39 | #define gs_dprintk(f, str...) if (gs_debug & f) printk (str) | |
40 | #else | |
41 | #define gs_dprintk(f, str...) /* nothing */ | |
42 | #endif | |
43 | ||
bf9d8929 HH |
44 | #define func_enter() gs_dprintk (GS_DEBUG_FLOW, "gs: enter %s\n", __func__) |
45 | #define func_exit() gs_dprintk (GS_DEBUG_FLOW, "gs: exit %s\n", __func__) | |
1da177e4 LT |
46 | |
47 | #define RS_EVENT_WRITE_WAKEUP 1 | |
48 | ||
49 | module_param(gs_debug, int, 0644); | |
50 | ||
51 | ||
76b25a55 | 52 | int gs_put_char(struct tty_struct * tty, unsigned char ch) |
1da177e4 LT |
53 | { |
54 | struct gs_port *port; | |
1da177e4 LT |
55 | |
56 | func_enter (); | |
57 | ||
1da177e4 LT |
58 | port = tty->driver_data; |
59 | ||
76b25a55 | 60 | if (!port) return 0; |
1da177e4 | 61 | |
b5391e29 | 62 | if (! (port->port.flags & ASYNC_INITIALIZED)) return 0; |
1da177e4 LT |
63 | |
64 | /* Take a lock on the serial tranmit buffer! */ | |
35426128 | 65 | mutex_lock(& port->port_write_mutex); |
1da177e4 LT |
66 | |
67 | if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) { | |
68 | /* Sorry, buffer is full, drop character. Update statistics???? -- REW */ | |
35426128 | 69 | mutex_unlock(&port->port_write_mutex); |
76b25a55 | 70 | return 0; |
1da177e4 LT |
71 | } |
72 | ||
73 | port->xmit_buf[port->xmit_head++] = ch; | |
74 | port->xmit_head &= SERIAL_XMIT_SIZE - 1; | |
75 | port->xmit_cnt++; /* Characters in buffer */ | |
76 | ||
35426128 | 77 | mutex_unlock(&port->port_write_mutex); |
1da177e4 | 78 | func_exit (); |
76b25a55 | 79 | return 1; |
1da177e4 LT |
80 | } |
81 | ||
82 | ||
1da177e4 LT |
83 | /* |
84 | > Problems to take into account are: | |
85 | > -1- Interrupts that empty part of the buffer. | |
86 | > -2- page faults on the access to userspace. | |
87 | > -3- Other processes that are also trying to do a "write". | |
88 | */ | |
89 | ||
90 | int gs_write(struct tty_struct * tty, | |
91 | const unsigned char *buf, int count) | |
92 | { | |
93 | struct gs_port *port; | |
94 | int c, total = 0; | |
95 | int t; | |
96 | ||
97 | func_enter (); | |
98 | ||
1da177e4 LT |
99 | port = tty->driver_data; |
100 | ||
101 | if (!port) return 0; | |
102 | ||
b5391e29 | 103 | if (! (port->port.flags & ASYNC_INITIALIZED)) |
1da177e4 LT |
104 | return 0; |
105 | ||
106 | /* get exclusive "write" access to this port (problem 3) */ | |
107 | /* This is not a spinlock because we can have a disk access (page | |
108 | fault) in copy_from_user */ | |
81861d78 | 109 | mutex_lock(& port->port_write_mutex); |
1da177e4 LT |
110 | |
111 | while (1) { | |
112 | ||
113 | c = count; | |
114 | ||
115 | /* This is safe because we "OWN" the "head". Noone else can | |
81861d78 | 116 | change the "head": we own the port_write_mutex. */ |
1da177e4 LT |
117 | /* Don't overrun the end of the buffer */ |
118 | t = SERIAL_XMIT_SIZE - port->xmit_head; | |
119 | if (t < c) c = t; | |
120 | ||
121 | /* This is safe because the xmit_cnt can only decrease. This | |
122 | would increase "t", so we might copy too little chars. */ | |
123 | /* Don't copy past the "head" of the buffer */ | |
124 | t = SERIAL_XMIT_SIZE - 1 - port->xmit_cnt; | |
125 | if (t < c) c = t; | |
126 | ||
127 | /* Can't copy more? break out! */ | |
128 | if (c <= 0) break; | |
129 | ||
130 | memcpy (port->xmit_buf + port->xmit_head, buf, c); | |
131 | ||
132 | port -> xmit_cnt += c; | |
133 | port -> xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE -1); | |
134 | buf += c; | |
135 | count -= c; | |
136 | total += c; | |
137 | } | |
81861d78 | 138 | mutex_unlock(& port->port_write_mutex); |
1da177e4 LT |
139 | |
140 | gs_dprintk (GS_DEBUG_WRITE, "write: interrupts are %s\n", | |
b5391e29 | 141 | (port->port.flags & GS_TX_INTEN)?"enabled": "disabled"); |
1da177e4 LT |
142 | |
143 | if (port->xmit_cnt && | |
144 | !tty->stopped && | |
145 | !tty->hw_stopped && | |
b5391e29 AC |
146 | !(port->port.flags & GS_TX_INTEN)) { |
147 | port->port.flags |= GS_TX_INTEN; | |
1da177e4 LT |
148 | port->rd->enable_tx_interrupts (port); |
149 | } | |
150 | func_exit (); | |
151 | return total; | |
152 | } | |
1da177e4 LT |
153 | |
154 | ||
155 | ||
156 | int gs_write_room(struct tty_struct * tty) | |
157 | { | |
158 | struct gs_port *port = tty->driver_data; | |
159 | int ret; | |
160 | ||
161 | func_enter (); | |
162 | ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1; | |
163 | if (ret < 0) | |
164 | ret = 0; | |
165 | func_exit (); | |
166 | return ret; | |
167 | } | |
168 | ||
169 | ||
170 | int gs_chars_in_buffer(struct tty_struct *tty) | |
171 | { | |
172 | struct gs_port *port = tty->driver_data; | |
173 | func_enter (); | |
174 | ||
175 | func_exit (); | |
176 | return port->xmit_cnt; | |
177 | } | |
178 | ||
179 | ||
180 | static int gs_real_chars_in_buffer(struct tty_struct *tty) | |
181 | { | |
182 | struct gs_port *port; | |
183 | func_enter (); | |
184 | ||
1da177e4 LT |
185 | port = tty->driver_data; |
186 | ||
187 | if (!port->rd) return 0; | |
188 | if (!port->rd->chars_in_buffer) return 0; | |
189 | ||
190 | func_exit (); | |
191 | return port->xmit_cnt + port->rd->chars_in_buffer (port); | |
192 | } | |
193 | ||
194 | ||
195 | static int gs_wait_tx_flushed (void * ptr, unsigned long timeout) | |
196 | { | |
197 | struct gs_port *port = ptr; | |
198 | unsigned long end_jiffies; | |
199 | int jiffies_to_transmit, charsleft = 0, rv = 0; | |
200 | int rcib; | |
201 | ||
202 | func_enter(); | |
203 | ||
204 | gs_dprintk (GS_DEBUG_FLUSH, "port=%p.\n", port); | |
205 | if (port) { | |
206 | gs_dprintk (GS_DEBUG_FLUSH, "xmit_cnt=%x, xmit_buf=%p, tty=%p.\n", | |
b5391e29 | 207 | port->xmit_cnt, port->xmit_buf, port->port.tty); |
1da177e4 LT |
208 | } |
209 | ||
210 | if (!port || port->xmit_cnt < 0 || !port->xmit_buf) { | |
211 | gs_dprintk (GS_DEBUG_FLUSH, "ERROR: !port, !port->xmit_buf or prot->xmit_cnt < 0.\n"); | |
212 | func_exit(); | |
213 | return -EINVAL; /* This is an error which we don't know how to handle. */ | |
214 | } | |
215 | ||
b5391e29 | 216 | rcib = gs_real_chars_in_buffer(port->port.tty); |
1da177e4 LT |
217 | |
218 | if(rcib <= 0) { | |
219 | gs_dprintk (GS_DEBUG_FLUSH, "nothing to wait for.\n"); | |
220 | func_exit(); | |
221 | return rv; | |
222 | } | |
223 | /* stop trying: now + twice the time it would normally take + seconds */ | |
224 | if (timeout == 0) timeout = MAX_SCHEDULE_TIMEOUT; | |
225 | end_jiffies = jiffies; | |
226 | if (timeout != MAX_SCHEDULE_TIMEOUT) | |
227 | end_jiffies += port->baud?(2 * rcib * 10 * HZ / port->baud):0; | |
228 | end_jiffies += timeout; | |
229 | ||
230 | gs_dprintk (GS_DEBUG_FLUSH, "now=%lx, end=%lx (%ld).\n", | |
231 | jiffies, end_jiffies, end_jiffies-jiffies); | |
232 | ||
233 | /* the expression is actually jiffies < end_jiffies, but that won't | |
234 | work around the wraparound. Tricky eh? */ | |
b5391e29 | 235 | while ((charsleft = gs_real_chars_in_buffer (port->port.tty)) && |
1da177e4 LT |
236 | time_after (end_jiffies, jiffies)) { |
237 | /* Units check: | |
238 | chars * (bits/char) * (jiffies /sec) / (bits/sec) = jiffies! | |
239 | check! */ | |
240 | ||
241 | charsleft += 16; /* Allow 16 chars more to be transmitted ... */ | |
242 | jiffies_to_transmit = port->baud?(1 + charsleft * 10 * HZ / port->baud):0; | |
243 | /* ^^^ Round up.... */ | |
244 | if (jiffies_to_transmit <= 0) jiffies_to_transmit = 1; | |
245 | ||
246 | gs_dprintk (GS_DEBUG_FLUSH, "Expect to finish in %d jiffies " | |
247 | "(%d chars).\n", jiffies_to_transmit, charsleft); | |
248 | ||
249 | msleep_interruptible(jiffies_to_msecs(jiffies_to_transmit)); | |
250 | if (signal_pending (current)) { | |
251 | gs_dprintk (GS_DEBUG_FLUSH, "Signal pending. Bombing out: "); | |
252 | rv = -EINTR; | |
253 | break; | |
254 | } | |
255 | } | |
256 | ||
257 | gs_dprintk (GS_DEBUG_FLUSH, "charsleft = %d.\n", charsleft); | |
258 | set_current_state (TASK_RUNNING); | |
259 | ||
260 | func_exit(); | |
261 | return rv; | |
262 | } | |
263 | ||
264 | ||
265 | ||
266 | void gs_flush_buffer(struct tty_struct *tty) | |
267 | { | |
268 | struct gs_port *port; | |
269 | unsigned long flags; | |
270 | ||
271 | func_enter (); | |
272 | ||
1da177e4 LT |
273 | port = tty->driver_data; |
274 | ||
275 | if (!port) return; | |
276 | ||
277 | /* XXX Would the write semaphore do? */ | |
278 | spin_lock_irqsave (&port->driver_lock, flags); | |
279 | port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; | |
280 | spin_unlock_irqrestore (&port->driver_lock, flags); | |
281 | ||
1da177e4 LT |
282 | tty_wakeup(tty); |
283 | func_exit (); | |
284 | } | |
285 | ||
286 | ||
287 | void gs_flush_chars(struct tty_struct * tty) | |
288 | { | |
289 | struct gs_port *port; | |
290 | ||
291 | func_enter (); | |
292 | ||
1da177e4 LT |
293 | port = tty->driver_data; |
294 | ||
295 | if (!port) return; | |
296 | ||
297 | if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || | |
298 | !port->xmit_buf) { | |
299 | func_exit (); | |
300 | return; | |
301 | } | |
302 | ||
303 | /* Beats me -- REW */ | |
b5391e29 | 304 | port->port.flags |= GS_TX_INTEN; |
1da177e4 LT |
305 | port->rd->enable_tx_interrupts (port); |
306 | func_exit (); | |
307 | } | |
308 | ||
309 | ||
310 | void gs_stop(struct tty_struct * tty) | |
311 | { | |
312 | struct gs_port *port; | |
313 | ||
314 | func_enter (); | |
315 | ||
1da177e4 LT |
316 | port = tty->driver_data; |
317 | ||
318 | if (!port) return; | |
319 | ||
320 | if (port->xmit_cnt && | |
321 | port->xmit_buf && | |
b5391e29 AC |
322 | (port->port.flags & GS_TX_INTEN) ) { |
323 | port->port.flags &= ~GS_TX_INTEN; | |
1da177e4 LT |
324 | port->rd->disable_tx_interrupts (port); |
325 | } | |
326 | func_exit (); | |
327 | } | |
328 | ||
329 | ||
330 | void gs_start(struct tty_struct * tty) | |
331 | { | |
332 | struct gs_port *port; | |
333 | ||
1da177e4 LT |
334 | port = tty->driver_data; |
335 | ||
336 | if (!port) return; | |
337 | ||
338 | if (port->xmit_cnt && | |
339 | port->xmit_buf && | |
b5391e29 AC |
340 | !(port->port.flags & GS_TX_INTEN) ) { |
341 | port->port.flags |= GS_TX_INTEN; | |
1da177e4 LT |
342 | port->rd->enable_tx_interrupts (port); |
343 | } | |
344 | func_exit (); | |
345 | } | |
346 | ||
347 | ||
348 | static void gs_shutdown_port (struct gs_port *port) | |
349 | { | |
350 | unsigned long flags; | |
351 | ||
352 | func_enter(); | |
353 | ||
354 | if (!port) return; | |
355 | ||
b5391e29 | 356 | if (!(port->port.flags & ASYNC_INITIALIZED)) |
1da177e4 LT |
357 | return; |
358 | ||
359 | spin_lock_irqsave(&port->driver_lock, flags); | |
360 | ||
361 | if (port->xmit_buf) { | |
362 | free_page((unsigned long) port->xmit_buf); | |
363 | port->xmit_buf = NULL; | |
364 | } | |
365 | ||
b5391e29 AC |
366 | if (port->port.tty) |
367 | set_bit(TTY_IO_ERROR, &port->port.tty->flags); | |
1da177e4 LT |
368 | |
369 | port->rd->shutdown_port (port); | |
370 | ||
b5391e29 | 371 | port->port.flags &= ~ASYNC_INITIALIZED; |
1da177e4 LT |
372 | spin_unlock_irqrestore(&port->driver_lock, flags); |
373 | ||
374 | func_exit(); | |
375 | } | |
376 | ||
377 | ||
378 | void gs_hangup(struct tty_struct *tty) | |
379 | { | |
510a3049 AC |
380 | struct gs_port *port; |
381 | unsigned long flags; | |
1da177e4 LT |
382 | |
383 | func_enter (); | |
384 | ||
1da177e4 | 385 | port = tty->driver_data; |
b5391e29 | 386 | tty = port->port.tty; |
1da177e4 LT |
387 | if (!tty) |
388 | return; | |
389 | ||
390 | gs_shutdown_port (port); | |
510a3049 | 391 | spin_lock_irqsave(&port->port.lock, flags); |
b5391e29 AC |
392 | port->port.flags &= ~(ASYNC_NORMAL_ACTIVE|GS_ACTIVE); |
393 | port->port.tty = NULL; | |
394 | port->port.count = 0; | |
510a3049 | 395 | spin_unlock_irqrestore(&port->port.lock, flags); |
1da177e4 | 396 | |
b5391e29 | 397 | wake_up_interruptible(&port->port.open_wait); |
1da177e4 LT |
398 | func_exit (); |
399 | } | |
400 | ||
401 | ||
402 | int gs_block_til_ready(void *port_, struct file * filp) | |
403 | { | |
31f35939 AC |
404 | struct gs_port *gp = port_; |
405 | struct tty_port *port = &gp->port; | |
1da177e4 LT |
406 | DECLARE_WAITQUEUE(wait, current); |
407 | int retval; | |
408 | int do_clocal = 0; | |
409 | int CD; | |
410 | struct tty_struct *tty; | |
411 | unsigned long flags; | |
412 | ||
413 | func_enter (); | |
414 | ||
415 | if (!port) return 0; | |
416 | ||
31f35939 | 417 | tty = port->tty; |
1da177e4 | 418 | |
1da177e4 LT |
419 | gs_dprintk (GS_DEBUG_BTR, "Entering gs_block_till_ready.\n"); |
420 | /* | |
421 | * If the device is in the middle of being closed, then block | |
422 | * until it's done, and then try again. | |
423 | */ | |
31f35939 AC |
424 | if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) { |
425 | interruptible_sleep_on(&port->close_wait); | |
426 | if (port->flags & ASYNC_HUP_NOTIFY) | |
1da177e4 LT |
427 | return -EAGAIN; |
428 | else | |
429 | return -ERESTARTSYS; | |
430 | } | |
431 | ||
432 | gs_dprintk (GS_DEBUG_BTR, "after hung up\n"); | |
433 | ||
434 | /* | |
435 | * If non-blocking mode is set, or the port is not enabled, | |
436 | * then make the check up front and then exit. | |
437 | */ | |
438 | if ((filp->f_flags & O_NONBLOCK) || | |
439 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
31f35939 | 440 | port->flags |= ASYNC_NORMAL_ACTIVE; |
1da177e4 LT |
441 | return 0; |
442 | } | |
443 | ||
444 | gs_dprintk (GS_DEBUG_BTR, "after nonblock\n"); | |
445 | ||
446 | if (C_CLOCAL(tty)) | |
447 | do_clocal = 1; | |
448 | ||
449 | /* | |
450 | * Block waiting for the carrier detect and the line to become | |
451 | * free (i.e., not in use by the callout). While we are in | |
31f35939 | 452 | * this loop, port->count is dropped by one, so that |
1da177e4 LT |
453 | * rs_close() knows when to free things. We restore it upon |
454 | * exit, either normal or abnormal. | |
455 | */ | |
456 | retval = 0; | |
457 | ||
31f35939 | 458 | add_wait_queue(&port->open_wait, &wait); |
1da177e4 LT |
459 | |
460 | gs_dprintk (GS_DEBUG_BTR, "after add waitq.\n"); | |
510a3049 | 461 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 462 | if (!tty_hung_up_p(filp)) { |
31f35939 | 463 | port->count--; |
1da177e4 | 464 | } |
31f35939 | 465 | port->blocked_open++; |
510a3049 | 466 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 467 | while (1) { |
31f35939 | 468 | CD = tty_port_carrier_raised(port); |
1da177e4 LT |
469 | gs_dprintk (GS_DEBUG_BTR, "CD is now %d.\n", CD); |
470 | set_current_state (TASK_INTERRUPTIBLE); | |
471 | if (tty_hung_up_p(filp) || | |
31f35939 AC |
472 | !(port->flags & ASYNC_INITIALIZED)) { |
473 | if (port->flags & ASYNC_HUP_NOTIFY) | |
1da177e4 LT |
474 | retval = -EAGAIN; |
475 | else | |
476 | retval = -ERESTARTSYS; | |
477 | break; | |
478 | } | |
31f35939 | 479 | if (!(port->flags & ASYNC_CLOSING) && |
1da177e4 LT |
480 | (do_clocal || CD)) |
481 | break; | |
482 | gs_dprintk (GS_DEBUG_BTR, "signal_pending is now: %d (%lx)\n", | |
483 | (int)signal_pending (current), *(long*)(¤t->blocked)); | |
484 | if (signal_pending(current)) { | |
485 | retval = -ERESTARTSYS; | |
486 | break; | |
487 | } | |
488 | schedule(); | |
489 | } | |
490 | gs_dprintk (GS_DEBUG_BTR, "Got out of the loop. (%d)\n", | |
31f35939 | 491 | port->blocked_open); |
1da177e4 | 492 | set_current_state (TASK_RUNNING); |
31f35939 | 493 | remove_wait_queue(&port->open_wait, &wait); |
510a3049 AC |
494 | |
495 | spin_lock_irqsave(&port->lock, flags); | |
1da177e4 | 496 | if (!tty_hung_up_p(filp)) { |
31f35939 | 497 | port->count++; |
1da177e4 | 498 | } |
31f35939 | 499 | port->blocked_open--; |
510a3049 AC |
500 | if (retval == 0) |
501 | port->flags |= ASYNC_NORMAL_ACTIVE; | |
502 | spin_unlock_irqrestore(&port->lock, flags); | |
1da177e4 | 503 | func_exit (); |
510a3049 | 504 | return retval; |
1da177e4 LT |
505 | } |
506 | ||
507 | ||
508 | void gs_close(struct tty_struct * tty, struct file * filp) | |
509 | { | |
510 | unsigned long flags; | |
511 | struct gs_port *port; | |
512 | ||
513 | func_enter (); | |
514 | ||
c9f19e96 | 515 | port = tty->driver_data; |
1da177e4 LT |
516 | |
517 | if (!port) return; | |
518 | ||
b5391e29 | 519 | if (!port->port.tty) { |
1da177e4 | 520 | /* This seems to happen when this is called from vhangup. */ |
b5391e29 AC |
521 | gs_dprintk (GS_DEBUG_CLOSE, "gs: Odd: port->port.tty is NULL\n"); |
522 | port->port.tty = tty; | |
1da177e4 LT |
523 | } |
524 | ||
510a3049 | 525 | spin_lock_irqsave(&port->port.lock, flags); |
1da177e4 LT |
526 | |
527 | if (tty_hung_up_p(filp)) { | |
510a3049 | 528 | spin_unlock_irqrestore(&port->port.lock, flags); |
1da177e4 LT |
529 | if (port->rd->hungup) |
530 | port->rd->hungup (port); | |
531 | func_exit (); | |
532 | return; | |
533 | } | |
534 | ||
b5391e29 | 535 | if ((tty->count == 1) && (port->port.count != 1)) { |
1da177e4 | 536 | printk(KERN_ERR "gs: gs_close port %p: bad port count;" |
b5391e29 AC |
537 | " tty->count is 1, port count is %d\n", port, port->port.count); |
538 | port->port.count = 1; | |
1da177e4 | 539 | } |
b5391e29 AC |
540 | if (--port->port.count < 0) { |
541 | printk(KERN_ERR "gs: gs_close port %p: bad port count: %d\n", port, port->port.count); | |
542 | port->port.count = 0; | |
1da177e4 LT |
543 | } |
544 | ||
b5391e29 AC |
545 | if (port->port.count) { |
546 | gs_dprintk(GS_DEBUG_CLOSE, "gs_close port %p: count: %d\n", port, port->port.count); | |
510a3049 | 547 | spin_unlock_irqrestore(&port->port.lock, flags); |
1da177e4 LT |
548 | func_exit (); |
549 | return; | |
550 | } | |
b5391e29 | 551 | port->port.flags |= ASYNC_CLOSING; |
1da177e4 LT |
552 | |
553 | /* | |
554 | * Now we wait for the transmit buffer to clear; and we notify | |
555 | * the line discipline to only process XON/XOFF characters. | |
556 | */ | |
557 | tty->closing = 1; | |
558 | /* if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
559 | tty_wait_until_sent(tty, port->closing_wait); */ | |
560 | ||
561 | /* | |
562 | * At this point we stop accepting input. To do this, we | |
563 | * disable the receive line status interrupts, and tell the | |
564 | * interrupt driver to stop checking the data ready bit in the | |
565 | * line status register. | |
566 | */ | |
567 | ||
510a3049 | 568 | spin_lock_irqsave(&port->driver_lock, flags); |
1da177e4 LT |
569 | port->rd->disable_rx_interrupts (port); |
570 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
510a3049 | 571 | spin_unlock_irqrestore(&port->port.lock, flags); |
1da177e4 LT |
572 | |
573 | /* close has no way of returning "EINTR", so discard return value */ | |
574 | if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
575 | gs_wait_tx_flushed (port, port->closing_wait); | |
576 | ||
b5391e29 | 577 | port->port.flags &= ~GS_ACTIVE; |
1da177e4 | 578 | |
978e595f | 579 | gs_flush_buffer(tty); |
1da177e4 LT |
580 | |
581 | tty_ldisc_flush(tty); | |
582 | tty->closing = 0; | |
583 | ||
510a3049 | 584 | spin_lock_irqsave(&port->driver_lock, flags); |
1da177e4 LT |
585 | port->event = 0; |
586 | port->rd->close (port); | |
587 | port->rd->shutdown_port (port); | |
510a3049 AC |
588 | spin_unlock_irqrestore(&port->driver_lock, flags); |
589 | ||
590 | spin_lock_irqsave(&port->port.lock, flags); | |
b5391e29 | 591 | port->port.tty = NULL; |
1da177e4 | 592 | |
b5391e29 | 593 | if (port->port.blocked_open) { |
1da177e4 | 594 | if (port->close_delay) { |
510a3049 | 595 | spin_unlock_irqrestore(&port->port.lock, flags); |
1da177e4 | 596 | msleep_interruptible(jiffies_to_msecs(port->close_delay)); |
510a3049 | 597 | spin_lock_irqsave(&port->port.lock, flags); |
1da177e4 | 598 | } |
b5391e29 | 599 | wake_up_interruptible(&port->port.open_wait); |
1da177e4 | 600 | } |
b5391e29 | 601 | port->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING | ASYNC_INITIALIZED); |
510a3049 | 602 | spin_unlock_irqrestore(&port->port.lock, flags); |
b5391e29 | 603 | wake_up_interruptible(&port->port.close_wait); |
1da177e4 LT |
604 | |
605 | func_exit (); | |
606 | } | |
607 | ||
608 | ||
1da177e4 | 609 | void gs_set_termios (struct tty_struct * tty, |
606d099c | 610 | struct ktermios * old_termios) |
1da177e4 LT |
611 | { |
612 | struct gs_port *port; | |
613 | int baudrate, tmp, rv; | |
606d099c | 614 | struct ktermios *tiosp; |
1da177e4 LT |
615 | |
616 | func_enter(); | |
617 | ||
1da177e4 LT |
618 | port = tty->driver_data; |
619 | ||
620 | if (!port) return; | |
b5391e29 | 621 | if (!port->port.tty) { |
1da177e4 | 622 | /* This seems to happen when this is called after gs_close. */ |
b5391e29 AC |
623 | gs_dprintk (GS_DEBUG_TERMIOS, "gs: Odd: port->port.tty is NULL\n"); |
624 | port->port.tty = tty; | |
1da177e4 LT |
625 | } |
626 | ||
627 | ||
628 | tiosp = tty->termios; | |
629 | ||
630 | if (gs_debug & GS_DEBUG_TERMIOS) { | |
631 | gs_dprintk (GS_DEBUG_TERMIOS, "termios structure (%p):\n", tiosp); | |
632 | } | |
633 | ||
1da177e4 LT |
634 | if(old_termios && (gs_debug & GS_DEBUG_TERMIOS)) { |
635 | if(tiosp->c_iflag != old_termios->c_iflag) printk("c_iflag changed\n"); | |
636 | if(tiosp->c_oflag != old_termios->c_oflag) printk("c_oflag changed\n"); | |
637 | if(tiosp->c_cflag != old_termios->c_cflag) printk("c_cflag changed\n"); | |
638 | if(tiosp->c_lflag != old_termios->c_lflag) printk("c_lflag changed\n"); | |
639 | if(tiosp->c_line != old_termios->c_line) printk("c_line changed\n"); | |
640 | if(!memcmp(tiosp->c_cc, old_termios->c_cc, NCC)) printk("c_cc changed\n"); | |
641 | } | |
642 | ||
d720bc4b | 643 | baudrate = tty_get_baud_rate(tty); |
1da177e4 | 644 | |
1da177e4 | 645 | if ((tiosp->c_cflag & CBAUD) == B38400) { |
b5391e29 | 646 | if ( (port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) |
1da177e4 | 647 | baudrate = 57600; |
b5391e29 | 648 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) |
1da177e4 | 649 | baudrate = 115200; |
b5391e29 | 650 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) |
1da177e4 | 651 | baudrate = 230400; |
b5391e29 | 652 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) |
1da177e4 | 653 | baudrate = 460800; |
b5391e29 | 654 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) |
1da177e4 LT |
655 | baudrate = (port->baud_base / port->custom_divisor); |
656 | } | |
657 | ||
658 | /* I recommend using THIS instead of the mess in termios (and | |
659 | duplicating the above code). Next we should create a clean | |
660 | interface towards this variable. If your card supports arbitrary | |
661 | baud rates, (e.g. CD1400 or 16550 based cards) then everything | |
662 | will be very easy..... */ | |
663 | port->baud = baudrate; | |
664 | ||
665 | /* Two timer ticks seems enough to wakeup something like SLIP driver */ | |
666 | /* Baudrate/10 is cps. Divide by HZ to get chars per tick. */ | |
667 | tmp = (baudrate / 10 / HZ) * 2; | |
668 | ||
669 | if (tmp < 0) tmp = 0; | |
670 | if (tmp >= SERIAL_XMIT_SIZE) tmp = SERIAL_XMIT_SIZE-1; | |
671 | ||
672 | port->wakeup_chars = tmp; | |
673 | ||
674 | /* We should really wait for the characters to be all sent before | |
675 | changing the settings. -- CAL */ | |
676 | rv = gs_wait_tx_flushed (port, MAX_SCHEDULE_TIMEOUT); | |
677 | if (rv < 0) return /* rv */; | |
678 | ||
679 | rv = port->rd->set_real_termios(port); | |
680 | if (rv < 0) return /* rv */; | |
681 | ||
682 | if ((!old_termios || | |
683 | (old_termios->c_cflag & CRTSCTS)) && | |
684 | !( tiosp->c_cflag & CRTSCTS)) { | |
685 | tty->stopped = 0; | |
686 | gs_start(tty); | |
687 | } | |
688 | ||
689 | #ifdef tytso_patch_94Nov25_1726 | |
690 | /* This "makes sense", Why is it commented out? */ | |
691 | ||
692 | if (!(old_termios->c_cflag & CLOCAL) && | |
693 | (tty->termios->c_cflag & CLOCAL)) | |
694 | wake_up_interruptible(&port->gs.open_wait); | |
695 | #endif | |
696 | ||
697 | func_exit(); | |
698 | return /* 0 */; | |
699 | } | |
700 | ||
701 | ||
702 | ||
703 | /* Must be called with interrupts enabled */ | |
704 | int gs_init_port(struct gs_port *port) | |
705 | { | |
706 | unsigned long flags; | |
1da177e4 LT |
707 | |
708 | func_enter (); | |
709 | ||
b5391e29 | 710 | if (port->port.flags & ASYNC_INITIALIZED) { |
1da177e4 LT |
711 | func_exit (); |
712 | return 0; | |
713 | } | |
714 | if (!port->xmit_buf) { | |
715 | /* We may sleep in get_zeroed_page() */ | |
716 | unsigned long tmp; | |
717 | ||
718 | tmp = get_zeroed_page(GFP_KERNEL); | |
719 | spin_lock_irqsave (&port->driver_lock, flags); | |
720 | if (port->xmit_buf) | |
721 | free_page (tmp); | |
722 | else | |
723 | port->xmit_buf = (unsigned char *) tmp; | |
724 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
725 | if (!port->xmit_buf) { | |
726 | func_exit (); | |
727 | return -ENOMEM; | |
728 | } | |
729 | } | |
730 | ||
731 | spin_lock_irqsave (&port->driver_lock, flags); | |
b5391e29 AC |
732 | if (port->port.tty) |
733 | clear_bit(TTY_IO_ERROR, &port->port.tty->flags); | |
81861d78 | 734 | mutex_init(&port->port_write_mutex); |
1da177e4 LT |
735 | port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; |
736 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
b5391e29 | 737 | gs_set_termios(port->port.tty, NULL); |
1da177e4 | 738 | spin_lock_irqsave (&port->driver_lock, flags); |
b5391e29 AC |
739 | port->port.flags |= ASYNC_INITIALIZED; |
740 | port->port.flags &= ~GS_TX_INTEN; | |
1da177e4 LT |
741 | |
742 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
743 | func_exit (); | |
744 | return 0; | |
745 | } | |
746 | ||
747 | ||
748 | int gs_setserial(struct gs_port *port, struct serial_struct __user *sp) | |
749 | { | |
750 | struct serial_struct sio; | |
751 | ||
752 | if (copy_from_user(&sio, sp, sizeof(struct serial_struct))) | |
753 | return(-EFAULT); | |
754 | ||
755 | if (!capable(CAP_SYS_ADMIN)) { | |
756 | if ((sio.baud_base != port->baud_base) || | |
757 | (sio.close_delay != port->close_delay) || | |
758 | ((sio.flags & ~ASYNC_USR_MASK) != | |
b5391e29 | 759 | (port->port.flags & ~ASYNC_USR_MASK))) |
1da177e4 LT |
760 | return(-EPERM); |
761 | } | |
762 | ||
b5391e29 | 763 | port->port.flags = (port->port.flags & ~ASYNC_USR_MASK) | |
1da177e4 LT |
764 | (sio.flags & ASYNC_USR_MASK); |
765 | ||
766 | port->baud_base = sio.baud_base; | |
767 | port->close_delay = sio.close_delay; | |
768 | port->closing_wait = sio.closing_wait; | |
769 | port->custom_divisor = sio.custom_divisor; | |
770 | ||
b5391e29 | 771 | gs_set_termios (port->port.tty, NULL); |
1da177e4 LT |
772 | |
773 | return 0; | |
774 | } | |
775 | ||
776 | ||
777 | /*****************************************************************************/ | |
778 | ||
779 | /* | |
780 | * Generate the serial struct info. | |
781 | */ | |
782 | ||
783 | int gs_getserial(struct gs_port *port, struct serial_struct __user *sp) | |
784 | { | |
785 | struct serial_struct sio; | |
786 | ||
787 | memset(&sio, 0, sizeof(struct serial_struct)); | |
b5391e29 | 788 | sio.flags = port->port.flags; |
1da177e4 LT |
789 | sio.baud_base = port->baud_base; |
790 | sio.close_delay = port->close_delay; | |
791 | sio.closing_wait = port->closing_wait; | |
792 | sio.custom_divisor = port->custom_divisor; | |
793 | sio.hub6 = 0; | |
794 | ||
795 | /* If you want you can override these. */ | |
796 | sio.type = PORT_UNKNOWN; | |
797 | sio.xmit_fifo_size = -1; | |
798 | sio.line = -1; | |
799 | sio.port = -1; | |
800 | sio.irq = -1; | |
801 | ||
802 | if (port->rd->getserial) | |
803 | port->rd->getserial (port, &sio); | |
804 | ||
805 | if (copy_to_user(sp, &sio, sizeof(struct serial_struct))) | |
806 | return -EFAULT; | |
807 | return 0; | |
808 | ||
809 | } | |
810 | ||
811 | ||
812 | void gs_got_break(struct gs_port *port) | |
813 | { | |
814 | func_enter (); | |
815 | ||
b5391e29 AC |
816 | tty_insert_flip_char(port->port.tty, 0, TTY_BREAK); |
817 | tty_schedule_flip(port->port.tty); | |
818 | if (port->port.flags & ASYNC_SAK) { | |
819 | do_SAK (port->port.tty); | |
1da177e4 LT |
820 | } |
821 | ||
822 | func_exit (); | |
823 | } | |
824 | ||
825 | ||
826 | EXPORT_SYMBOL(gs_put_char); | |
827 | EXPORT_SYMBOL(gs_write); | |
828 | EXPORT_SYMBOL(gs_write_room); | |
829 | EXPORT_SYMBOL(gs_chars_in_buffer); | |
830 | EXPORT_SYMBOL(gs_flush_buffer); | |
831 | EXPORT_SYMBOL(gs_flush_chars); | |
832 | EXPORT_SYMBOL(gs_stop); | |
833 | EXPORT_SYMBOL(gs_start); | |
834 | EXPORT_SYMBOL(gs_hangup); | |
835 | EXPORT_SYMBOL(gs_block_til_ready); | |
836 | EXPORT_SYMBOL(gs_close); | |
837 | EXPORT_SYMBOL(gs_set_termios); | |
838 | EXPORT_SYMBOL(gs_init_port); | |
839 | EXPORT_SYMBOL(gs_setserial); | |
840 | EXPORT_SYMBOL(gs_getserial); | |
841 | EXPORT_SYMBOL(gs_got_break); | |
842 | ||
843 | MODULE_LICENSE("GPL"); |