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> | |
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> | |
5a0e3ad6 | 32 | #include <linux/gfp.h> |
1da177e4 LT |
33 | #include <asm/uaccess.h> |
34 | ||
35 | #define DEBUG | |
36 | ||
1da177e4 LT |
37 | static int gs_debug; |
38 | ||
39 | #ifdef DEBUG | |
40 | #define gs_dprintk(f, str...) if (gs_debug & f) printk (str) | |
41 | #else | |
42 | #define gs_dprintk(f, str...) /* nothing */ | |
43 | #endif | |
44 | ||
bf9d8929 HH |
45 | #define func_enter() gs_dprintk (GS_DEBUG_FLOW, "gs: enter %s\n", __func__) |
46 | #define func_exit() gs_dprintk (GS_DEBUG_FLOW, "gs: exit %s\n", __func__) | |
1da177e4 LT |
47 | |
48 | #define RS_EVENT_WRITE_WAKEUP 1 | |
49 | ||
50 | module_param(gs_debug, int, 0644); | |
51 | ||
52 | ||
76b25a55 | 53 | int gs_put_char(struct tty_struct * tty, unsigned char ch) |
1da177e4 LT |
54 | { |
55 | struct gs_port *port; | |
1da177e4 LT |
56 | |
57 | func_enter (); | |
58 | ||
1da177e4 LT |
59 | port = tty->driver_data; |
60 | ||
76b25a55 | 61 | if (!port) return 0; |
1da177e4 | 62 | |
b5391e29 | 63 | if (! (port->port.flags & ASYNC_INITIALIZED)) return 0; |
1da177e4 LT |
64 | |
65 | /* Take a lock on the serial tranmit buffer! */ | |
35426128 | 66 | mutex_lock(& port->port_write_mutex); |
1da177e4 LT |
67 | |
68 | if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) { | |
69 | /* Sorry, buffer is full, drop character. Update statistics???? -- REW */ | |
35426128 | 70 | mutex_unlock(&port->port_write_mutex); |
76b25a55 | 71 | return 0; |
1da177e4 LT |
72 | } |
73 | ||
74 | port->xmit_buf[port->xmit_head++] = ch; | |
75 | port->xmit_head &= SERIAL_XMIT_SIZE - 1; | |
76 | port->xmit_cnt++; /* Characters in buffer */ | |
77 | ||
35426128 | 78 | mutex_unlock(&port->port_write_mutex); |
1da177e4 | 79 | func_exit (); |
76b25a55 | 80 | return 1; |
1da177e4 LT |
81 | } |
82 | ||
83 | ||
1da177e4 LT |
84 | /* |
85 | > Problems to take into account are: | |
86 | > -1- Interrupts that empty part of the buffer. | |
87 | > -2- page faults on the access to userspace. | |
88 | > -3- Other processes that are also trying to do a "write". | |
89 | */ | |
90 | ||
91 | int gs_write(struct tty_struct * tty, | |
92 | const unsigned char *buf, int count) | |
93 | { | |
94 | struct gs_port *port; | |
95 | int c, total = 0; | |
96 | int t; | |
97 | ||
98 | func_enter (); | |
99 | ||
1da177e4 LT |
100 | port = tty->driver_data; |
101 | ||
102 | if (!port) return 0; | |
103 | ||
b5391e29 | 104 | if (! (port->port.flags & ASYNC_INITIALIZED)) |
1da177e4 LT |
105 | return 0; |
106 | ||
107 | /* get exclusive "write" access to this port (problem 3) */ | |
108 | /* This is not a spinlock because we can have a disk access (page | |
109 | fault) in copy_from_user */ | |
81861d78 | 110 | mutex_lock(& port->port_write_mutex); |
1da177e4 LT |
111 | |
112 | while (1) { | |
113 | ||
114 | c = count; | |
115 | ||
116 | /* This is safe because we "OWN" the "head". Noone else can | |
81861d78 | 117 | change the "head": we own the port_write_mutex. */ |
1da177e4 LT |
118 | /* Don't overrun the end of the buffer */ |
119 | t = SERIAL_XMIT_SIZE - port->xmit_head; | |
120 | if (t < c) c = t; | |
121 | ||
122 | /* This is safe because the xmit_cnt can only decrease. This | |
123 | would increase "t", so we might copy too little chars. */ | |
124 | /* Don't copy past the "head" of the buffer */ | |
125 | t = SERIAL_XMIT_SIZE - 1 - port->xmit_cnt; | |
126 | if (t < c) c = t; | |
127 | ||
128 | /* Can't copy more? break out! */ | |
129 | if (c <= 0) break; | |
130 | ||
131 | memcpy (port->xmit_buf + port->xmit_head, buf, c); | |
132 | ||
133 | port -> xmit_cnt += c; | |
134 | port -> xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE -1); | |
135 | buf += c; | |
136 | count -= c; | |
137 | total += c; | |
138 | } | |
81861d78 | 139 | mutex_unlock(& port->port_write_mutex); |
1da177e4 LT |
140 | |
141 | gs_dprintk (GS_DEBUG_WRITE, "write: interrupts are %s\n", | |
b5391e29 | 142 | (port->port.flags & GS_TX_INTEN)?"enabled": "disabled"); |
1da177e4 LT |
143 | |
144 | if (port->xmit_cnt && | |
145 | !tty->stopped && | |
146 | !tty->hw_stopped && | |
b5391e29 AC |
147 | !(port->port.flags & GS_TX_INTEN)) { |
148 | port->port.flags |= GS_TX_INTEN; | |
1da177e4 LT |
149 | port->rd->enable_tx_interrupts (port); |
150 | } | |
151 | func_exit (); | |
152 | return total; | |
153 | } | |
1da177e4 LT |
154 | |
155 | ||
156 | ||
157 | int gs_write_room(struct tty_struct * tty) | |
158 | { | |
159 | struct gs_port *port = tty->driver_data; | |
160 | int ret; | |
161 | ||
162 | func_enter (); | |
163 | ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1; | |
164 | if (ret < 0) | |
165 | ret = 0; | |
166 | func_exit (); | |
167 | return ret; | |
168 | } | |
169 | ||
170 | ||
171 | int gs_chars_in_buffer(struct tty_struct *tty) | |
172 | { | |
173 | struct gs_port *port = tty->driver_data; | |
174 | func_enter (); | |
175 | ||
176 | func_exit (); | |
177 | return port->xmit_cnt; | |
178 | } | |
179 | ||
180 | ||
181 | static int gs_real_chars_in_buffer(struct tty_struct *tty) | |
182 | { | |
183 | struct gs_port *port; | |
184 | func_enter (); | |
185 | ||
1da177e4 LT |
186 | port = tty->driver_data; |
187 | ||
188 | if (!port->rd) return 0; | |
189 | if (!port->rd->chars_in_buffer) return 0; | |
190 | ||
191 | func_exit (); | |
192 | return port->xmit_cnt + port->rd->chars_in_buffer (port); | |
193 | } | |
194 | ||
195 | ||
196 | static int gs_wait_tx_flushed (void * ptr, unsigned long timeout) | |
197 | { | |
198 | struct gs_port *port = ptr; | |
199 | unsigned long end_jiffies; | |
200 | int jiffies_to_transmit, charsleft = 0, rv = 0; | |
201 | int rcib; | |
202 | ||
203 | func_enter(); | |
204 | ||
205 | gs_dprintk (GS_DEBUG_FLUSH, "port=%p.\n", port); | |
206 | if (port) { | |
207 | gs_dprintk (GS_DEBUG_FLUSH, "xmit_cnt=%x, xmit_buf=%p, tty=%p.\n", | |
b5391e29 | 208 | port->xmit_cnt, port->xmit_buf, port->port.tty); |
1da177e4 LT |
209 | } |
210 | ||
211 | if (!port || port->xmit_cnt < 0 || !port->xmit_buf) { | |
212 | gs_dprintk (GS_DEBUG_FLUSH, "ERROR: !port, !port->xmit_buf or prot->xmit_cnt < 0.\n"); | |
213 | func_exit(); | |
214 | return -EINVAL; /* This is an error which we don't know how to handle. */ | |
215 | } | |
216 | ||
b5391e29 | 217 | rcib = gs_real_chars_in_buffer(port->port.tty); |
1da177e4 LT |
218 | |
219 | if(rcib <= 0) { | |
220 | gs_dprintk (GS_DEBUG_FLUSH, "nothing to wait for.\n"); | |
221 | func_exit(); | |
222 | return rv; | |
223 | } | |
224 | /* stop trying: now + twice the time it would normally take + seconds */ | |
225 | if (timeout == 0) timeout = MAX_SCHEDULE_TIMEOUT; | |
226 | end_jiffies = jiffies; | |
227 | if (timeout != MAX_SCHEDULE_TIMEOUT) | |
228 | end_jiffies += port->baud?(2 * rcib * 10 * HZ / port->baud):0; | |
229 | end_jiffies += timeout; | |
230 | ||
231 | gs_dprintk (GS_DEBUG_FLUSH, "now=%lx, end=%lx (%ld).\n", | |
232 | jiffies, end_jiffies, end_jiffies-jiffies); | |
233 | ||
234 | /* the expression is actually jiffies < end_jiffies, but that won't | |
235 | work around the wraparound. Tricky eh? */ | |
b5391e29 | 236 | while ((charsleft = gs_real_chars_in_buffer (port->port.tty)) && |
1da177e4 LT |
237 | time_after (end_jiffies, jiffies)) { |
238 | /* Units check: | |
239 | chars * (bits/char) * (jiffies /sec) / (bits/sec) = jiffies! | |
240 | check! */ | |
241 | ||
242 | charsleft += 16; /* Allow 16 chars more to be transmitted ... */ | |
243 | jiffies_to_transmit = port->baud?(1 + charsleft * 10 * HZ / port->baud):0; | |
244 | /* ^^^ Round up.... */ | |
245 | if (jiffies_to_transmit <= 0) jiffies_to_transmit = 1; | |
246 | ||
247 | gs_dprintk (GS_DEBUG_FLUSH, "Expect to finish in %d jiffies " | |
248 | "(%d chars).\n", jiffies_to_transmit, charsleft); | |
249 | ||
250 | msleep_interruptible(jiffies_to_msecs(jiffies_to_transmit)); | |
251 | if (signal_pending (current)) { | |
252 | gs_dprintk (GS_DEBUG_FLUSH, "Signal pending. Bombing out: "); | |
253 | rv = -EINTR; | |
254 | break; | |
255 | } | |
256 | } | |
257 | ||
258 | gs_dprintk (GS_DEBUG_FLUSH, "charsleft = %d.\n", charsleft); | |
259 | set_current_state (TASK_RUNNING); | |
260 | ||
261 | func_exit(); | |
262 | return rv; | |
263 | } | |
264 | ||
265 | ||
266 | ||
267 | void gs_flush_buffer(struct tty_struct *tty) | |
268 | { | |
269 | struct gs_port *port; | |
270 | unsigned long flags; | |
271 | ||
272 | func_enter (); | |
273 | ||
1da177e4 LT |
274 | port = tty->driver_data; |
275 | ||
276 | if (!port) return; | |
277 | ||
278 | /* XXX Would the write semaphore do? */ | |
279 | spin_lock_irqsave (&port->driver_lock, flags); | |
280 | port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; | |
281 | spin_unlock_irqrestore (&port->driver_lock, flags); | |
282 | ||
1da177e4 LT |
283 | tty_wakeup(tty); |
284 | func_exit (); | |
285 | } | |
286 | ||
287 | ||
288 | void gs_flush_chars(struct tty_struct * tty) | |
289 | { | |
290 | struct gs_port *port; | |
291 | ||
292 | func_enter (); | |
293 | ||
1da177e4 LT |
294 | port = tty->driver_data; |
295 | ||
296 | if (!port) return; | |
297 | ||
298 | if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || | |
299 | !port->xmit_buf) { | |
300 | func_exit (); | |
301 | return; | |
302 | } | |
303 | ||
304 | /* Beats me -- REW */ | |
b5391e29 | 305 | port->port.flags |= GS_TX_INTEN; |
1da177e4 LT |
306 | port->rd->enable_tx_interrupts (port); |
307 | func_exit (); | |
308 | } | |
309 | ||
310 | ||
311 | void gs_stop(struct tty_struct * tty) | |
312 | { | |
313 | struct gs_port *port; | |
314 | ||
315 | func_enter (); | |
316 | ||
1da177e4 LT |
317 | port = tty->driver_data; |
318 | ||
319 | if (!port) return; | |
320 | ||
321 | if (port->xmit_cnt && | |
322 | port->xmit_buf && | |
b5391e29 AC |
323 | (port->port.flags & GS_TX_INTEN) ) { |
324 | port->port.flags &= ~GS_TX_INTEN; | |
1da177e4 LT |
325 | port->rd->disable_tx_interrupts (port); |
326 | } | |
327 | func_exit (); | |
328 | } | |
329 | ||
330 | ||
331 | void gs_start(struct tty_struct * tty) | |
332 | { | |
333 | struct gs_port *port; | |
334 | ||
1da177e4 LT |
335 | port = tty->driver_data; |
336 | ||
337 | if (!port) return; | |
338 | ||
339 | if (port->xmit_cnt && | |
340 | port->xmit_buf && | |
b5391e29 AC |
341 | !(port->port.flags & GS_TX_INTEN) ) { |
342 | port->port.flags |= GS_TX_INTEN; | |
1da177e4 LT |
343 | port->rd->enable_tx_interrupts (port); |
344 | } | |
345 | func_exit (); | |
346 | } | |
347 | ||
348 | ||
349 | static void gs_shutdown_port (struct gs_port *port) | |
350 | { | |
351 | unsigned long flags; | |
352 | ||
353 | func_enter(); | |
354 | ||
355 | if (!port) return; | |
356 | ||
b5391e29 | 357 | if (!(port->port.flags & ASYNC_INITIALIZED)) |
1da177e4 LT |
358 | return; |
359 | ||
360 | spin_lock_irqsave(&port->driver_lock, flags); | |
361 | ||
362 | if (port->xmit_buf) { | |
363 | free_page((unsigned long) port->xmit_buf); | |
364 | port->xmit_buf = NULL; | |
365 | } | |
366 | ||
b5391e29 AC |
367 | if (port->port.tty) |
368 | set_bit(TTY_IO_ERROR, &port->port.tty->flags); | |
1da177e4 LT |
369 | |
370 | port->rd->shutdown_port (port); | |
371 | ||
b5391e29 | 372 | port->port.flags &= ~ASYNC_INITIALIZED; |
1da177e4 LT |
373 | spin_unlock_irqrestore(&port->driver_lock, flags); |
374 | ||
375 | func_exit(); | |
376 | } | |
377 | ||
378 | ||
379 | void gs_hangup(struct tty_struct *tty) | |
380 | { | |
510a3049 AC |
381 | struct gs_port *port; |
382 | unsigned long flags; | |
1da177e4 LT |
383 | |
384 | func_enter (); | |
385 | ||
1da177e4 | 386 | port = tty->driver_data; |
b5391e29 | 387 | tty = port->port.tty; |
1da177e4 LT |
388 | if (!tty) |
389 | return; | |
390 | ||
391 | gs_shutdown_port (port); | |
510a3049 | 392 | spin_lock_irqsave(&port->port.lock, flags); |
b5391e29 AC |
393 | port->port.flags &= ~(ASYNC_NORMAL_ACTIVE|GS_ACTIVE); |
394 | port->port.tty = NULL; | |
395 | port->port.count = 0; | |
510a3049 | 396 | spin_unlock_irqrestore(&port->port.lock, flags); |
1da177e4 | 397 | |
b5391e29 | 398 | wake_up_interruptible(&port->port.open_wait); |
1da177e4 LT |
399 | func_exit (); |
400 | } | |
401 | ||
402 | ||
403 | int gs_block_til_ready(void *port_, struct file * filp) | |
404 | { | |
31f35939 AC |
405 | struct gs_port *gp = port_; |
406 | struct tty_port *port = &gp->port; | |
1da177e4 LT |
407 | DECLARE_WAITQUEUE(wait, current); |
408 | int retval; | |
409 | int do_clocal = 0; | |
410 | int CD; | |
411 | struct tty_struct *tty; | |
412 | unsigned long flags; | |
413 | ||
414 | func_enter (); | |
415 | ||
416 | if (!port) return 0; | |
417 | ||
31f35939 | 418 | tty = port->tty; |
1da177e4 | 419 | |
1da177e4 LT |
420 | gs_dprintk (GS_DEBUG_BTR, "Entering gs_block_till_ready.\n"); |
421 | /* | |
422 | * If the device is in the middle of being closed, then block | |
423 | * until it's done, and then try again. | |
424 | */ | |
31f35939 AC |
425 | if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) { |
426 | interruptible_sleep_on(&port->close_wait); | |
427 | if (port->flags & ASYNC_HUP_NOTIFY) | |
1da177e4 LT |
428 | return -EAGAIN; |
429 | else | |
430 | return -ERESTARTSYS; | |
431 | } | |
432 | ||
433 | gs_dprintk (GS_DEBUG_BTR, "after hung up\n"); | |
434 | ||
435 | /* | |
436 | * If non-blocking mode is set, or the port is not enabled, | |
437 | * then make the check up front and then exit. | |
438 | */ | |
439 | if ((filp->f_flags & O_NONBLOCK) || | |
440 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
31f35939 | 441 | port->flags |= ASYNC_NORMAL_ACTIVE; |
1da177e4 LT |
442 | return 0; |
443 | } | |
444 | ||
445 | gs_dprintk (GS_DEBUG_BTR, "after nonblock\n"); | |
446 | ||
447 | if (C_CLOCAL(tty)) | |
448 | do_clocal = 1; | |
449 | ||
450 | /* | |
451 | * Block waiting for the carrier detect and the line to become | |
452 | * free (i.e., not in use by the callout). While we are in | |
31f35939 | 453 | * this loop, port->count is dropped by one, so that |
1da177e4 LT |
454 | * rs_close() knows when to free things. We restore it upon |
455 | * exit, either normal or abnormal. | |
456 | */ | |
457 | retval = 0; | |
458 | ||
31f35939 | 459 | add_wait_queue(&port->open_wait, &wait); |
1da177e4 LT |
460 | |
461 | gs_dprintk (GS_DEBUG_BTR, "after add waitq.\n"); | |
510a3049 | 462 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 463 | if (!tty_hung_up_p(filp)) { |
31f35939 | 464 | port->count--; |
1da177e4 | 465 | } |
31f35939 | 466 | port->blocked_open++; |
510a3049 | 467 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 468 | while (1) { |
31f35939 | 469 | CD = tty_port_carrier_raised(port); |
1da177e4 LT |
470 | gs_dprintk (GS_DEBUG_BTR, "CD is now %d.\n", CD); |
471 | set_current_state (TASK_INTERRUPTIBLE); | |
472 | if (tty_hung_up_p(filp) || | |
31f35939 AC |
473 | !(port->flags & ASYNC_INITIALIZED)) { |
474 | if (port->flags & ASYNC_HUP_NOTIFY) | |
1da177e4 LT |
475 | retval = -EAGAIN; |
476 | else | |
477 | retval = -ERESTARTSYS; | |
478 | break; | |
479 | } | |
31f35939 | 480 | if (!(port->flags & ASYNC_CLOSING) && |
1da177e4 LT |
481 | (do_clocal || CD)) |
482 | break; | |
483 | gs_dprintk (GS_DEBUG_BTR, "signal_pending is now: %d (%lx)\n", | |
484 | (int)signal_pending (current), *(long*)(¤t->blocked)); | |
485 | if (signal_pending(current)) { | |
486 | retval = -ERESTARTSYS; | |
487 | break; | |
488 | } | |
489 | schedule(); | |
490 | } | |
491 | gs_dprintk (GS_DEBUG_BTR, "Got out of the loop. (%d)\n", | |
31f35939 | 492 | port->blocked_open); |
1da177e4 | 493 | set_current_state (TASK_RUNNING); |
31f35939 | 494 | remove_wait_queue(&port->open_wait, &wait); |
510a3049 AC |
495 | |
496 | spin_lock_irqsave(&port->lock, flags); | |
1da177e4 | 497 | if (!tty_hung_up_p(filp)) { |
31f35939 | 498 | port->count++; |
1da177e4 | 499 | } |
31f35939 | 500 | port->blocked_open--; |
510a3049 AC |
501 | if (retval == 0) |
502 | port->flags |= ASYNC_NORMAL_ACTIVE; | |
503 | spin_unlock_irqrestore(&port->lock, flags); | |
1da177e4 | 504 | func_exit (); |
510a3049 | 505 | return retval; |
1da177e4 LT |
506 | } |
507 | ||
508 | ||
509 | void gs_close(struct tty_struct * tty, struct file * filp) | |
510 | { | |
511 | unsigned long flags; | |
512 | struct gs_port *port; | |
513 | ||
514 | func_enter (); | |
515 | ||
c9f19e96 | 516 | port = tty->driver_data; |
1da177e4 LT |
517 | |
518 | if (!port) return; | |
519 | ||
b5391e29 | 520 | if (!port->port.tty) { |
1da177e4 | 521 | /* This seems to happen when this is called from vhangup. */ |
b5391e29 AC |
522 | gs_dprintk (GS_DEBUG_CLOSE, "gs: Odd: port->port.tty is NULL\n"); |
523 | port->port.tty = tty; | |
1da177e4 LT |
524 | } |
525 | ||
510a3049 | 526 | spin_lock_irqsave(&port->port.lock, flags); |
1da177e4 LT |
527 | |
528 | if (tty_hung_up_p(filp)) { | |
510a3049 | 529 | spin_unlock_irqrestore(&port->port.lock, flags); |
1da177e4 LT |
530 | if (port->rd->hungup) |
531 | port->rd->hungup (port); | |
532 | func_exit (); | |
533 | return; | |
534 | } | |
535 | ||
b5391e29 | 536 | if ((tty->count == 1) && (port->port.count != 1)) { |
1da177e4 | 537 | printk(KERN_ERR "gs: gs_close port %p: bad port count;" |
b5391e29 AC |
538 | " tty->count is 1, port count is %d\n", port, port->port.count); |
539 | port->port.count = 1; | |
1da177e4 | 540 | } |
b5391e29 AC |
541 | if (--port->port.count < 0) { |
542 | printk(KERN_ERR "gs: gs_close port %p: bad port count: %d\n", port, port->port.count); | |
543 | port->port.count = 0; | |
1da177e4 LT |
544 | } |
545 | ||
b5391e29 AC |
546 | if (port->port.count) { |
547 | gs_dprintk(GS_DEBUG_CLOSE, "gs_close port %p: count: %d\n", port, port->port.count); | |
510a3049 | 548 | spin_unlock_irqrestore(&port->port.lock, flags); |
1da177e4 LT |
549 | func_exit (); |
550 | return; | |
551 | } | |
b5391e29 | 552 | port->port.flags |= ASYNC_CLOSING; |
1da177e4 LT |
553 | |
554 | /* | |
555 | * Now we wait for the transmit buffer to clear; and we notify | |
556 | * the line discipline to only process XON/XOFF characters. | |
557 | */ | |
558 | tty->closing = 1; | |
559 | /* if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
560 | tty_wait_until_sent(tty, port->closing_wait); */ | |
561 | ||
562 | /* | |
563 | * At this point we stop accepting input. To do this, we | |
564 | * disable the receive line status interrupts, and tell the | |
565 | * interrupt driver to stop checking the data ready bit in the | |
566 | * line status register. | |
567 | */ | |
568 | ||
510a3049 | 569 | spin_lock_irqsave(&port->driver_lock, flags); |
1da177e4 LT |
570 | port->rd->disable_rx_interrupts (port); |
571 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
510a3049 | 572 | spin_unlock_irqrestore(&port->port.lock, flags); |
1da177e4 LT |
573 | |
574 | /* close has no way of returning "EINTR", so discard return value */ | |
575 | if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
576 | gs_wait_tx_flushed (port, port->closing_wait); | |
577 | ||
b5391e29 | 578 | port->port.flags &= ~GS_ACTIVE; |
1da177e4 | 579 | |
978e595f | 580 | gs_flush_buffer(tty); |
1da177e4 LT |
581 | |
582 | tty_ldisc_flush(tty); | |
583 | tty->closing = 0; | |
584 | ||
510a3049 | 585 | spin_lock_irqsave(&port->driver_lock, flags); |
1da177e4 LT |
586 | port->event = 0; |
587 | port->rd->close (port); | |
588 | port->rd->shutdown_port (port); | |
510a3049 AC |
589 | spin_unlock_irqrestore(&port->driver_lock, flags); |
590 | ||
591 | spin_lock_irqsave(&port->port.lock, flags); | |
b5391e29 | 592 | port->port.tty = NULL; |
1da177e4 | 593 | |
b5391e29 | 594 | if (port->port.blocked_open) { |
1da177e4 | 595 | if (port->close_delay) { |
510a3049 | 596 | spin_unlock_irqrestore(&port->port.lock, flags); |
1da177e4 | 597 | msleep_interruptible(jiffies_to_msecs(port->close_delay)); |
510a3049 | 598 | spin_lock_irqsave(&port->port.lock, flags); |
1da177e4 | 599 | } |
b5391e29 | 600 | wake_up_interruptible(&port->port.open_wait); |
1da177e4 | 601 | } |
b5391e29 | 602 | port->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING | ASYNC_INITIALIZED); |
510a3049 | 603 | spin_unlock_irqrestore(&port->port.lock, flags); |
b5391e29 | 604 | wake_up_interruptible(&port->port.close_wait); |
1da177e4 LT |
605 | |
606 | func_exit (); | |
607 | } | |
608 | ||
609 | ||
1da177e4 | 610 | void gs_set_termios (struct tty_struct * tty, |
606d099c | 611 | struct ktermios * old_termios) |
1da177e4 LT |
612 | { |
613 | struct gs_port *port; | |
614 | int baudrate, tmp, rv; | |
606d099c | 615 | struct ktermios *tiosp; |
1da177e4 LT |
616 | |
617 | func_enter(); | |
618 | ||
1da177e4 LT |
619 | port = tty->driver_data; |
620 | ||
621 | if (!port) return; | |
b5391e29 | 622 | if (!port->port.tty) { |
1da177e4 | 623 | /* This seems to happen when this is called after gs_close. */ |
b5391e29 AC |
624 | gs_dprintk (GS_DEBUG_TERMIOS, "gs: Odd: port->port.tty is NULL\n"); |
625 | port->port.tty = tty; | |
1da177e4 LT |
626 | } |
627 | ||
628 | ||
629 | tiosp = tty->termios; | |
630 | ||
631 | if (gs_debug & GS_DEBUG_TERMIOS) { | |
632 | gs_dprintk (GS_DEBUG_TERMIOS, "termios structure (%p):\n", tiosp); | |
633 | } | |
634 | ||
1da177e4 LT |
635 | if(old_termios && (gs_debug & GS_DEBUG_TERMIOS)) { |
636 | if(tiosp->c_iflag != old_termios->c_iflag) printk("c_iflag changed\n"); | |
637 | if(tiosp->c_oflag != old_termios->c_oflag) printk("c_oflag changed\n"); | |
638 | if(tiosp->c_cflag != old_termios->c_cflag) printk("c_cflag changed\n"); | |
639 | if(tiosp->c_lflag != old_termios->c_lflag) printk("c_lflag changed\n"); | |
640 | if(tiosp->c_line != old_termios->c_line) printk("c_line changed\n"); | |
641 | if(!memcmp(tiosp->c_cc, old_termios->c_cc, NCC)) printk("c_cc changed\n"); | |
642 | } | |
643 | ||
d720bc4b | 644 | baudrate = tty_get_baud_rate(tty); |
1da177e4 | 645 | |
1da177e4 | 646 | if ((tiosp->c_cflag & CBAUD) == B38400) { |
b5391e29 | 647 | if ( (port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) |
1da177e4 | 648 | baudrate = 57600; |
b5391e29 | 649 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) |
1da177e4 | 650 | baudrate = 115200; |
b5391e29 | 651 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) |
1da177e4 | 652 | baudrate = 230400; |
b5391e29 | 653 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) |
1da177e4 | 654 | baudrate = 460800; |
b5391e29 | 655 | else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) |
1da177e4 LT |
656 | baudrate = (port->baud_base / port->custom_divisor); |
657 | } | |
658 | ||
659 | /* I recommend using THIS instead of the mess in termios (and | |
660 | duplicating the above code). Next we should create a clean | |
661 | interface towards this variable. If your card supports arbitrary | |
662 | baud rates, (e.g. CD1400 or 16550 based cards) then everything | |
663 | will be very easy..... */ | |
664 | port->baud = baudrate; | |
665 | ||
666 | /* Two timer ticks seems enough to wakeup something like SLIP driver */ | |
667 | /* Baudrate/10 is cps. Divide by HZ to get chars per tick. */ | |
668 | tmp = (baudrate / 10 / HZ) * 2; | |
669 | ||
670 | if (tmp < 0) tmp = 0; | |
671 | if (tmp >= SERIAL_XMIT_SIZE) tmp = SERIAL_XMIT_SIZE-1; | |
672 | ||
673 | port->wakeup_chars = tmp; | |
674 | ||
675 | /* We should really wait for the characters to be all sent before | |
676 | changing the settings. -- CAL */ | |
677 | rv = gs_wait_tx_flushed (port, MAX_SCHEDULE_TIMEOUT); | |
678 | if (rv < 0) return /* rv */; | |
679 | ||
680 | rv = port->rd->set_real_termios(port); | |
681 | if (rv < 0) return /* rv */; | |
682 | ||
683 | if ((!old_termios || | |
684 | (old_termios->c_cflag & CRTSCTS)) && | |
685 | !( tiosp->c_cflag & CRTSCTS)) { | |
686 | tty->stopped = 0; | |
687 | gs_start(tty); | |
688 | } | |
689 | ||
690 | #ifdef tytso_patch_94Nov25_1726 | |
691 | /* This "makes sense", Why is it commented out? */ | |
692 | ||
693 | if (!(old_termios->c_cflag & CLOCAL) && | |
694 | (tty->termios->c_cflag & CLOCAL)) | |
695 | wake_up_interruptible(&port->gs.open_wait); | |
696 | #endif | |
697 | ||
698 | func_exit(); | |
699 | return /* 0 */; | |
700 | } | |
701 | ||
702 | ||
703 | ||
704 | /* Must be called with interrupts enabled */ | |
705 | int gs_init_port(struct gs_port *port) | |
706 | { | |
707 | unsigned long flags; | |
1da177e4 LT |
708 | |
709 | func_enter (); | |
710 | ||
b5391e29 | 711 | if (port->port.flags & ASYNC_INITIALIZED) { |
1da177e4 LT |
712 | func_exit (); |
713 | return 0; | |
714 | } | |
715 | if (!port->xmit_buf) { | |
716 | /* We may sleep in get_zeroed_page() */ | |
717 | unsigned long tmp; | |
718 | ||
719 | tmp = get_zeroed_page(GFP_KERNEL); | |
720 | spin_lock_irqsave (&port->driver_lock, flags); | |
721 | if (port->xmit_buf) | |
722 | free_page (tmp); | |
723 | else | |
724 | port->xmit_buf = (unsigned char *) tmp; | |
725 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
726 | if (!port->xmit_buf) { | |
727 | func_exit (); | |
728 | return -ENOMEM; | |
729 | } | |
730 | } | |
731 | ||
732 | spin_lock_irqsave (&port->driver_lock, flags); | |
b5391e29 AC |
733 | if (port->port.tty) |
734 | clear_bit(TTY_IO_ERROR, &port->port.tty->flags); | |
81861d78 | 735 | mutex_init(&port->port_write_mutex); |
1da177e4 LT |
736 | port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; |
737 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
b5391e29 | 738 | gs_set_termios(port->port.tty, NULL); |
1da177e4 | 739 | spin_lock_irqsave (&port->driver_lock, flags); |
b5391e29 AC |
740 | port->port.flags |= ASYNC_INITIALIZED; |
741 | port->port.flags &= ~GS_TX_INTEN; | |
1da177e4 LT |
742 | |
743 | spin_unlock_irqrestore(&port->driver_lock, flags); | |
744 | func_exit (); | |
745 | return 0; | |
746 | } | |
747 | ||
748 | ||
749 | int gs_setserial(struct gs_port *port, struct serial_struct __user *sp) | |
750 | { | |
751 | struct serial_struct sio; | |
752 | ||
753 | if (copy_from_user(&sio, sp, sizeof(struct serial_struct))) | |
754 | return(-EFAULT); | |
755 | ||
756 | if (!capable(CAP_SYS_ADMIN)) { | |
757 | if ((sio.baud_base != port->baud_base) || | |
758 | (sio.close_delay != port->close_delay) || | |
759 | ((sio.flags & ~ASYNC_USR_MASK) != | |
b5391e29 | 760 | (port->port.flags & ~ASYNC_USR_MASK))) |
1da177e4 LT |
761 | return(-EPERM); |
762 | } | |
763 | ||
b5391e29 | 764 | port->port.flags = (port->port.flags & ~ASYNC_USR_MASK) | |
1da177e4 LT |
765 | (sio.flags & ASYNC_USR_MASK); |
766 | ||
767 | port->baud_base = sio.baud_base; | |
768 | port->close_delay = sio.close_delay; | |
769 | port->closing_wait = sio.closing_wait; | |
770 | port->custom_divisor = sio.custom_divisor; | |
771 | ||
b5391e29 | 772 | gs_set_termios (port->port.tty, NULL); |
1da177e4 LT |
773 | |
774 | return 0; | |
775 | } | |
776 | ||
777 | ||
778 | /*****************************************************************************/ | |
779 | ||
780 | /* | |
781 | * Generate the serial struct info. | |
782 | */ | |
783 | ||
784 | int gs_getserial(struct gs_port *port, struct serial_struct __user *sp) | |
785 | { | |
786 | struct serial_struct sio; | |
787 | ||
788 | memset(&sio, 0, sizeof(struct serial_struct)); | |
b5391e29 | 789 | sio.flags = port->port.flags; |
1da177e4 LT |
790 | sio.baud_base = port->baud_base; |
791 | sio.close_delay = port->close_delay; | |
792 | sio.closing_wait = port->closing_wait; | |
793 | sio.custom_divisor = port->custom_divisor; | |
794 | sio.hub6 = 0; | |
795 | ||
796 | /* If you want you can override these. */ | |
797 | sio.type = PORT_UNKNOWN; | |
798 | sio.xmit_fifo_size = -1; | |
799 | sio.line = -1; | |
800 | sio.port = -1; | |
801 | sio.irq = -1; | |
802 | ||
803 | if (port->rd->getserial) | |
804 | port->rd->getserial (port, &sio); | |
805 | ||
806 | if (copy_to_user(sp, &sio, sizeof(struct serial_struct))) | |
807 | return -EFAULT; | |
808 | return 0; | |
809 | ||
810 | } | |
811 | ||
812 | ||
813 | void gs_got_break(struct gs_port *port) | |
814 | { | |
815 | func_enter (); | |
816 | ||
b5391e29 AC |
817 | tty_insert_flip_char(port->port.tty, 0, TTY_BREAK); |
818 | tty_schedule_flip(port->port.tty); | |
819 | if (port->port.flags & ASYNC_SAK) { | |
820 | do_SAK (port->port.tty); | |
1da177e4 LT |
821 | } |
822 | ||
823 | func_exit (); | |
824 | } | |
825 | ||
826 | ||
827 | EXPORT_SYMBOL(gs_put_char); | |
828 | EXPORT_SYMBOL(gs_write); | |
829 | EXPORT_SYMBOL(gs_write_room); | |
830 | EXPORT_SYMBOL(gs_chars_in_buffer); | |
831 | EXPORT_SYMBOL(gs_flush_buffer); | |
832 | EXPORT_SYMBOL(gs_flush_chars); | |
833 | EXPORT_SYMBOL(gs_stop); | |
834 | EXPORT_SYMBOL(gs_start); | |
835 | EXPORT_SYMBOL(gs_hangup); | |
836 | EXPORT_SYMBOL(gs_block_til_ready); | |
837 | EXPORT_SYMBOL(gs_close); | |
838 | EXPORT_SYMBOL(gs_set_termios); | |
839 | EXPORT_SYMBOL(gs_init_port); | |
840 | EXPORT_SYMBOL(gs_setserial); | |
841 | EXPORT_SYMBOL(gs_getserial); | |
842 | EXPORT_SYMBOL(gs_got_break); | |
843 | ||
844 | MODULE_LICENSE("GPL"); |