Commit | Line | Data |
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0b99d589 LL |
1 | /* |
2 | * Copyright 2003 Digi International (www.digi.com) | |
3 | * Scott H Kilau <Scott_Kilau at digi dot com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2, or (at your option) | |
8 | * any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the | |
12 | * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR | |
13 | * PURPOSE. See the GNU General Public License for more details. | |
0b99d589 LL |
14 | */ |
15 | ||
16 | /************************************************************************ | |
8b07d521 | 17 | * |
0b99d589 LL |
18 | * This file implements the tty driver functionality for the |
19 | * Neo and ClassicBoard PCI based product lines. | |
8b07d521 | 20 | * |
0b99d589 LL |
21 | ************************************************************************ |
22 | * | |
0b99d589 LL |
23 | */ |
24 | ||
25 | #include <linux/kernel.h> | |
0b99d589 LL |
26 | #include <linux/sched.h> /* For jiffies, task states */ |
27 | #include <linux/interrupt.h> /* For tasklet and interrupt structs/defines */ | |
28 | #include <linux/module.h> | |
29 | #include <linux/ctype.h> | |
30 | #include <linux/tty.h> | |
31 | #include <linux/tty_flip.h> | |
d533a524 | 32 | #include <linux/types.h> |
0b99d589 LL |
33 | #include <linux/serial_reg.h> |
34 | #include <linux/slab.h> | |
90d2a471 | 35 | #include <linux/delay.h> /* For udelay */ |
fb33cac8 | 36 | #include <linux/uaccess.h> /* For copy_from_user/copy_to_user */ |
0b99d589 | 37 | #include <linux/pci.h> |
0b99d589 LL |
38 | #include "dgnc_driver.h" |
39 | #include "dgnc_tty.h" | |
0b99d589 LL |
40 | #include "dgnc_neo.h" |
41 | #include "dgnc_cls.h" | |
0b99d589 | 42 | #include "dgnc_sysfs.h" |
9a633d00 | 43 | #include "dgnc_utils.h" |
0b99d589 | 44 | |
0b99d589 LL |
45 | /* |
46 | * internal variables | |
47 | */ | |
446393e9 | 48 | static unsigned char *dgnc_TmpWriteBuf; |
0b99d589 LL |
49 | |
50 | /* | |
51 | * Default transparent print information. | |
52 | */ | |
53 | static struct digi_t dgnc_digi_init = { | |
54 | .digi_flags = DIGI_COOK, /* Flags */ | |
55 | .digi_maxcps = 100, /* Max CPS */ | |
56 | .digi_maxchar = 50, /* Max chars in print queue */ | |
57 | .digi_bufsize = 100, /* Printer buffer size */ | |
58 | .digi_onlen = 4, /* size of printer on string */ | |
59 | .digi_offlen = 4, /* size of printer off string */ | |
60 | .digi_onstr = "\033[5i", /* ANSI printer on string ] */ | |
61 | .digi_offstr = "\033[4i", /* ANSI printer off string ] */ | |
62 | .digi_term = "ansi" /* default terminal type */ | |
63 | }; | |
64 | ||
0b99d589 LL |
65 | /* |
66 | * Define a local default termios struct. All ports will be created | |
67 | * with this termios initially. | |
68 | * | |
69 | * This defines a raw port at 9600 baud, 8 data bits, no parity, | |
70 | * 1 stop bit. | |
71 | */ | |
10352c2a | 72 | static struct ktermios DgncDefaultTermios = { |
0b99d589 LL |
73 | .c_iflag = (DEFAULT_IFLAGS), /* iflags */ |
74 | .c_oflag = (DEFAULT_OFLAGS), /* oflags */ | |
75 | .c_cflag = (DEFAULT_CFLAGS), /* cflags */ | |
76 | .c_lflag = (DEFAULT_LFLAGS), /* lflags */ | |
77 | .c_cc = INIT_C_CC, | |
78 | .c_line = 0, | |
79 | }; | |
80 | ||
0b99d589 LL |
81 | /* Our function prototypes */ |
82 | static int dgnc_tty_open(struct tty_struct *tty, struct file *file); | |
83 | static void dgnc_tty_close(struct tty_struct *tty, struct file *file); | |
851f306d CM |
84 | static int dgnc_block_til_ready(struct tty_struct *tty, struct file *file, |
85 | struct channel_t *ch); | |
86 | static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, | |
87 | unsigned long arg); | |
88 | static int dgnc_tty_digigeta(struct tty_struct *tty, | |
89 | struct digi_t __user *retinfo); | |
90 | static int dgnc_tty_digiseta(struct tty_struct *tty, | |
91 | struct digi_t __user *new_info); | |
58b905b3 | 92 | static int dgnc_tty_write_room(struct tty_struct *tty); |
0b99d589 | 93 | static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c); |
58b905b3 | 94 | static int dgnc_tty_chars_in_buffer(struct tty_struct *tty); |
0b99d589 LL |
95 | static void dgnc_tty_start(struct tty_struct *tty); |
96 | static void dgnc_tty_stop(struct tty_struct *tty); | |
97 | static void dgnc_tty_throttle(struct tty_struct *tty); | |
98 | static void dgnc_tty_unthrottle(struct tty_struct *tty); | |
99 | static void dgnc_tty_flush_chars(struct tty_struct *tty); | |
100 | static void dgnc_tty_flush_buffer(struct tty_struct *tty); | |
101 | static void dgnc_tty_hangup(struct tty_struct *tty); | |
c23b48e0 | 102 | static int dgnc_set_modem_info(struct channel_t *ch, unsigned int command, |
851f306d CM |
103 | unsigned int __user *value); |
104 | static int dgnc_get_modem_info(struct channel_t *ch, | |
105 | unsigned int __user *value); | |
0b99d589 | 106 | static int dgnc_tty_tiocmget(struct tty_struct *tty); |
851f306d CM |
107 | static int dgnc_tty_tiocmset(struct tty_struct *tty, unsigned int set, |
108 | unsigned int clear); | |
0b99d589 LL |
109 | static int dgnc_tty_send_break(struct tty_struct *tty, int msec); |
110 | static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout); | |
851f306d CM |
111 | static int dgnc_tty_write(struct tty_struct *tty, const unsigned char *buf, |
112 | int count); | |
113 | static void dgnc_tty_set_termios(struct tty_struct *tty, | |
114 | struct ktermios *old_termios); | |
0b99d589 LL |
115 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char ch); |
116 | ||
0b99d589 LL |
117 | static const struct tty_operations dgnc_tty_ops = { |
118 | .open = dgnc_tty_open, | |
119 | .close = dgnc_tty_close, | |
120 | .write = dgnc_tty_write, | |
121 | .write_room = dgnc_tty_write_room, | |
122 | .flush_buffer = dgnc_tty_flush_buffer, | |
123 | .chars_in_buffer = dgnc_tty_chars_in_buffer, | |
124 | .flush_chars = dgnc_tty_flush_chars, | |
125 | .ioctl = dgnc_tty_ioctl, | |
126 | .set_termios = dgnc_tty_set_termios, | |
127 | .stop = dgnc_tty_stop, | |
128 | .start = dgnc_tty_start, | |
129 | .throttle = dgnc_tty_throttle, | |
130 | .unthrottle = dgnc_tty_unthrottle, | |
131 | .hangup = dgnc_tty_hangup, | |
132 | .put_char = dgnc_tty_put_char, | |
133 | .tiocmget = dgnc_tty_tiocmget, | |
134 | .tiocmset = dgnc_tty_tiocmset, | |
135 | .break_ctl = dgnc_tty_send_break, | |
136 | .wait_until_sent = dgnc_tty_wait_until_sent, | |
137 | .send_xchar = dgnc_tty_send_xchar | |
138 | }; | |
139 | ||
140 | /************************************************************************ | |
8b07d521 | 141 | * |
0b99d589 | 142 | * TTY Initialization/Cleanup Functions |
8b07d521 | 143 | * |
0b99d589 | 144 | ************************************************************************/ |
8b07d521 | 145 | |
0b99d589 LL |
146 | /* |
147 | * dgnc_tty_preinit() | |
148 | * | |
149 | * Initialize any global tty related data before we download any boards. | |
150 | */ | |
151 | int dgnc_tty_preinit(void) | |
152 | { | |
153 | /* | |
154 | * Allocate a buffer for doing the copy from user space to | |
155 | * kernel space in dgnc_write(). We only use one buffer and | |
156 | * control access to it with a semaphore. If we are paging, we | |
157 | * are already in trouble so one buffer won't hurt much anyway. | |
158 | * | |
159 | * We are okay to sleep in the malloc, as this routine | |
160 | * is only called during module load, (not in interrupt context), | |
161 | * and with no locks held. | |
162 | */ | |
163 | dgnc_TmpWriteBuf = kmalloc(WRITEBUFLEN, GFP_KERNEL); | |
164 | ||
f1e51745 | 165 | if (!dgnc_TmpWriteBuf) |
8f90ef80 | 166 | return -ENOMEM; |
0b99d589 | 167 | |
8f90ef80 | 168 | return 0; |
0b99d589 LL |
169 | } |
170 | ||
0b99d589 LL |
171 | /* |
172 | * dgnc_tty_register() | |
173 | * | |
174 | * Init the tty subsystem for this board. | |
175 | */ | |
03425f55 | 176 | int dgnc_tty_register(struct dgnc_board *brd) |
0b99d589 | 177 | { |
60b3109e | 178 | int rc; |
8b07d521 | 179 | |
60b3109e DY |
180 | brd->serial_driver = tty_alloc_driver(brd->maxports, |
181 | TTY_DRIVER_REAL_RAW | | |
182 | TTY_DRIVER_DYNAMIC_DEV | | |
183 | TTY_DRIVER_HARDWARE_BREAK); | |
0b99d589 | 184 | |
60b3109e DY |
185 | if (IS_ERR(brd->serial_driver)) |
186 | return PTR_ERR(brd->serial_driver); | |
0b99d589 | 187 | |
6841b2a0 CM |
188 | snprintf(brd->serial_name, MAXTTYNAMELEN, "tty_dgnc_%d_", |
189 | brd->boardnum); | |
0b99d589 | 190 | |
60b3109e DY |
191 | brd->serial_driver->name = brd->serial_name; |
192 | brd->serial_driver->name_base = 0; | |
193 | brd->serial_driver->major = 0; | |
194 | brd->serial_driver->minor_start = 0; | |
195 | brd->serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
196 | brd->serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
197 | brd->serial_driver->init_termios = DgncDefaultTermios; | |
198 | brd->serial_driver->driver_name = DRVSTR; | |
0b99d589 | 199 | |
0b99d589 LL |
200 | /* |
201 | * Entry points for driver. Called by the kernel from | |
202 | * tty_io.c and n_tty.c. | |
203 | */ | |
60b3109e | 204 | tty_set_operations(brd->serial_driver, &dgnc_tty_ops); |
0b99d589 | 205 | |
1cd7c062 DY |
206 | rc = tty_register_driver(brd->serial_driver); |
207 | if (rc < 0) { | |
208 | dev_dbg(&brd->pdev->dev, | |
209 | "Can't register tty device (%d)\n", rc); | |
210 | goto free_serial_driver; | |
0b99d589 LL |
211 | } |
212 | ||
213 | /* | |
214 | * If we're doing transparent print, we have to do all of the above | |
79e30af2 | 215 | * again, separately so we don't get the LD confused about what major |
0b99d589 LL |
216 | * we are when we get into the dgnc_tty_open() routine. |
217 | */ | |
60b3109e DY |
218 | brd->print_driver = tty_alloc_driver(brd->maxports, |
219 | TTY_DRIVER_REAL_RAW | | |
220 | TTY_DRIVER_DYNAMIC_DEV | | |
221 | TTY_DRIVER_HARDWARE_BREAK); | |
0b99d589 | 222 | |
a0ca97b8 DY |
223 | if (IS_ERR(brd->print_driver)) { |
224 | rc = PTR_ERR(brd->print_driver); | |
225 | goto unregister_serial_driver; | |
226 | } | |
0b99d589 | 227 | |
60b3109e | 228 | snprintf(brd->print_name, MAXTTYNAMELEN, "pr_dgnc_%d_", brd->boardnum); |
0b99d589 | 229 | |
60b3109e DY |
230 | brd->print_driver->name = brd->print_name; |
231 | brd->print_driver->name_base = 0; | |
232 | brd->print_driver->major = brd->serial_driver->major; | |
233 | brd->print_driver->minor_start = 0x80; | |
234 | brd->print_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
235 | brd->print_driver->subtype = SERIAL_TYPE_NORMAL; | |
236 | brd->print_driver->init_termios = DgncDefaultTermios; | |
237 | brd->print_driver->driver_name = DRVSTR; | |
0b99d589 | 238 | |
0b99d589 LL |
239 | /* |
240 | * Entry points for driver. Called by the kernel from | |
241 | * tty_io.c and n_tty.c. | |
242 | */ | |
60b3109e | 243 | tty_set_operations(brd->print_driver, &dgnc_tty_ops); |
0b99d589 | 244 | |
1cd7c062 DY |
245 | rc = tty_register_driver(brd->print_driver); |
246 | if (rc < 0) { | |
247 | dev_dbg(&brd->pdev->dev, | |
248 | "Can't register Transparent Print device(%d)\n", | |
249 | rc); | |
250 | goto free_print_driver; | |
0b99d589 LL |
251 | } |
252 | ||
60b3109e DY |
253 | return 0; |
254 | ||
255 | free_print_driver: | |
256 | put_tty_driver(brd->print_driver); | |
257 | unregister_serial_driver: | |
258 | tty_unregister_driver(brd->serial_driver); | |
259 | free_serial_driver: | |
260 | put_tty_driver(brd->serial_driver); | |
0b99d589 | 261 | |
8f90ef80 | 262 | return rc; |
0b99d589 LL |
263 | } |
264 | ||
eea5fd11 DY |
265 | void dgnc_tty_unregister(struct dgnc_board *brd) |
266 | { | |
267 | tty_unregister_driver(brd->print_driver); | |
268 | tty_unregister_driver(brd->serial_driver); | |
269 | put_tty_driver(brd->print_driver); | |
270 | put_tty_driver(brd->serial_driver); | |
271 | } | |
272 | ||
0b99d589 LL |
273 | /* |
274 | * dgnc_tty_init() | |
275 | * | |
276 | * Init the tty subsystem. Called once per board after board has been | |
277 | * downloaded and init'ed. | |
278 | */ | |
03425f55 | 279 | int dgnc_tty_init(struct dgnc_board *brd) |
0b99d589 LL |
280 | { |
281 | int i; | |
a7a75386 | 282 | void __iomem *vaddr; |
0b99d589 LL |
283 | struct channel_t *ch; |
284 | ||
285 | if (!brd) | |
8f90ef80 | 286 | return -ENXIO; |
0b99d589 | 287 | |
0b99d589 LL |
288 | /* |
289 | * Initialize board structure elements. | |
290 | */ | |
291 | ||
292 | vaddr = brd->re_map_membase; | |
293 | ||
294 | brd->nasync = brd->maxports; | |
295 | ||
0b99d589 | 296 | for (i = 0; i < brd->nasync; i++) { |
fa52d96c GS |
297 | /* |
298 | * Okay to malloc with GFP_KERNEL, we are not at | |
299 | * interrupt context, and there are no locks held. | |
300 | */ | |
301 | brd->channels[i] = kzalloc(sizeof(*brd->channels[i]), | |
302 | GFP_KERNEL); | |
303 | if (!brd->channels[i]) | |
304 | goto err_free_channels; | |
0b99d589 LL |
305 | } |
306 | ||
307 | ch = brd->channels[0]; | |
308 | vaddr = brd->re_map_membase; | |
309 | ||
310 | /* Set up channel variables */ | |
311 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
a44b508a | 312 | spin_lock_init(&ch->ch_lock); |
0b99d589 LL |
313 | |
314 | /* Store all our magic numbers */ | |
315 | ch->magic = DGNC_CHANNEL_MAGIC; | |
316 | ch->ch_tun.magic = DGNC_UNIT_MAGIC; | |
317 | ch->ch_tun.un_ch = ch; | |
318 | ch->ch_tun.un_type = DGNC_SERIAL; | |
319 | ch->ch_tun.un_dev = i; | |
320 | ||
321 | ch->ch_pun.magic = DGNC_UNIT_MAGIC; | |
322 | ch->ch_pun.un_ch = ch; | |
323 | ch->ch_pun.un_type = DGNC_PRINT; | |
324 | ch->ch_pun.un_dev = i + 128; | |
325 | ||
326 | if (brd->bd_uart_offset == 0x200) | |
a7a75386 | 327 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 | 328 | else |
a7a75386 | 329 | ch->ch_cls_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 LL |
330 | |
331 | ch->ch_bd = brd; | |
332 | ch->ch_portnum = i; | |
333 | ch->ch_digi = dgnc_digi_init; | |
334 | ||
335 | /* .25 second delay */ | |
336 | ch->ch_close_delay = 250; | |
337 | ||
338 | init_waitqueue_head(&ch->ch_flags_wait); | |
339 | init_waitqueue_head(&ch->ch_tun.un_flags_wait); | |
340 | init_waitqueue_head(&ch->ch_pun.un_flags_wait); | |
0b99d589 LL |
341 | |
342 | { | |
343 | struct device *classp; | |
0eaa02e6 | 344 | |
60b3109e | 345 | classp = tty_register_device(brd->serial_driver, i, |
7df227c4 | 346 | &ch->ch_bd->pdev->dev); |
0b99d589 LL |
347 | ch->ch_tun.un_sysfs = classp; |
348 | dgnc_create_tty_sysfs(&ch->ch_tun, classp); | |
349 | ||
60b3109e | 350 | classp = tty_register_device(brd->print_driver, i, |
7df227c4 | 351 | &ch->ch_bd->pdev->dev); |
0b99d589 LL |
352 | ch->ch_pun.un_sysfs = classp; |
353 | dgnc_create_tty_sysfs(&ch->ch_pun, classp); | |
354 | } | |
0b99d589 LL |
355 | } |
356 | ||
8f90ef80 | 357 | return 0; |
fa52d96c GS |
358 | |
359 | err_free_channels: | |
360 | for (i = i - 1; i >= 0; --i) { | |
361 | kfree(brd->channels[i]); | |
362 | brd->channels[i] = NULL; | |
363 | } | |
364 | return -ENOMEM; | |
0b99d589 LL |
365 | } |
366 | ||
0b99d589 LL |
367 | /* |
368 | * dgnc_tty_post_uninit() | |
369 | * | |
370 | * UnInitialize any global tty related data. | |
371 | */ | |
372 | void dgnc_tty_post_uninit(void) | |
373 | { | |
5b4af85e DY |
374 | kfree(dgnc_TmpWriteBuf); |
375 | dgnc_TmpWriteBuf = NULL; | |
0b99d589 LL |
376 | } |
377 | ||
0b99d589 | 378 | /* |
33ccb442 | 379 | * dgnc_cleanup_tty() |
0b99d589 LL |
380 | * |
381 | * Uninitialize the TTY portion of this driver. Free all memory and | |
8b07d521 | 382 | * resources. |
0b99d589 | 383 | */ |
33ccb442 | 384 | void dgnc_cleanup_tty(struct dgnc_board *brd) |
0b99d589 LL |
385 | { |
386 | int i = 0; | |
387 | ||
1cd7c062 DY |
388 | for (i = 0; i < brd->nasync; i++) { |
389 | if (brd->channels[i]) | |
390 | dgnc_remove_tty_sysfs(brd->channels[i]-> | |
391 | ch_tun.un_sysfs); | |
392 | tty_unregister_device(brd->serial_driver, i); | |
0b99d589 | 393 | } |
1cd7c062 | 394 | tty_unregister_driver(brd->serial_driver); |
0b99d589 | 395 | |
1cd7c062 DY |
396 | for (i = 0; i < brd->nasync; i++) { |
397 | if (brd->channels[i]) | |
398 | dgnc_remove_tty_sysfs(brd->channels[i]-> | |
399 | ch_pun.un_sysfs); | |
400 | tty_unregister_device(brd->print_driver, i); | |
0b99d589 | 401 | } |
1cd7c062 | 402 | tty_unregister_driver(brd->print_driver); |
0b99d589 | 403 | |
60b3109e DY |
404 | put_tty_driver(brd->serial_driver); |
405 | put_tty_driver(brd->print_driver); | |
0b99d589 LL |
406 | } |
407 | ||
8e8d27f7 | 408 | /* |
0b99d589 LL |
409 | * dgnc_wmove - Write data to transmit queue. |
410 | * | |
411 | * ch - Pointer to channel structure. | |
f7f2b10a | 412 | * buf - Pointer to characters to be moved. |
0b99d589 | 413 | * n - Number of characters to move. |
8e8d27f7 | 414 | */ |
0b99d589 LL |
415 | static void dgnc_wmove(struct channel_t *ch, char *buf, uint n) |
416 | { | |
417 | int remain; | |
418 | uint head; | |
419 | ||
420 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
421 | return; | |
8b07d521 | 422 | |
0b99d589 LL |
423 | head = ch->ch_w_head & WQUEUEMASK; |
424 | ||
425 | /* | |
426 | * If the write wraps over the top of the circular buffer, | |
427 | * move the portion up to the wrap point, and reset the | |
428 | * pointers to the bottom. | |
429 | */ | |
430 | remain = WQUEUESIZE - head; | |
431 | ||
432 | if (n >= remain) { | |
8b07d521 | 433 | n -= remain; |
0b99d589 LL |
434 | memcpy(ch->ch_wqueue + head, buf, remain); |
435 | head = 0; | |
436 | buf += remain; | |
437 | } | |
438 | ||
439 | if (n > 0) { | |
440 | /* | |
441 | * Move rest of data. | |
442 | */ | |
443 | remain = n; | |
444 | memcpy(ch->ch_wqueue + head, buf, remain); | |
445 | head += remain; | |
446 | } | |
447 | ||
448 | head &= WQUEUEMASK; | |
449 | ch->ch_w_head = head; | |
450 | } | |
451 | ||
8e8d27f7 | 452 | /* |
0b99d589 | 453 | * dgnc_input - Process received data. |
8b07d521 | 454 | * |
90d2a471 | 455 | * ch - Pointer to channel structure. |
8e8d27f7 | 456 | */ |
0b99d589 LL |
457 | void dgnc_input(struct channel_t *ch) |
458 | { | |
03425f55 | 459 | struct dgnc_board *bd; |
0b99d589 | 460 | struct tty_struct *tp; |
c84a083b | 461 | struct tty_ldisc *ld = NULL; |
0b99d589 LL |
462 | uint rmask; |
463 | ushort head; | |
464 | ushort tail; | |
465 | int data_len; | |
a44b508a | 466 | unsigned long flags; |
0b99d589 LL |
467 | int flip_len; |
468 | int len = 0; | |
469 | int n = 0; | |
0b99d589 LL |
470 | int s = 0; |
471 | int i = 0; | |
472 | ||
473 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
474 | return; | |
475 | ||
476 | tp = ch->ch_tun.un_tty; | |
477 | ||
478 | bd = ch->ch_bd; | |
a82477c3 | 479 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
0b99d589 LL |
480 | return; |
481 | ||
a44b508a | 482 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 483 | |
8b07d521 LL |
484 | /* |
485 | * Figure the number of characters in the buffer. | |
0b99d589 LL |
486 | * Exit immediately if none. |
487 | */ | |
488 | rmask = RQUEUEMASK; | |
489 | head = ch->ch_r_head & rmask; | |
490 | tail = ch->ch_r_tail & rmask; | |
491 | data_len = (head - tail) & rmask; | |
492 | ||
c84a083b QL |
493 | if (data_len == 0) |
494 | goto exit_unlock; | |
0b99d589 | 495 | |
0b99d589 LL |
496 | /* |
497 | * If the device is not open, or CREAD is off, | |
90d2a471 | 498 | * flush input data and return immediately. |
0b99d589 | 499 | */ |
851f306d CM |
500 | if (!tp || (tp->magic != TTY_MAGIC) || |
501 | !(ch->ch_tun.un_flags & UN_ISOPEN) || | |
9db276f8 | 502 | !C_CREAD(tp) || |
851f306d | 503 | (ch->ch_tun.un_flags & UN_CLOSING)) { |
0b99d589 LL |
504 | ch->ch_r_head = tail; |
505 | ||
506 | /* Force queue flow control to be released, if needed */ | |
507 | dgnc_check_queue_flow_control(ch); | |
508 | ||
c84a083b | 509 | goto exit_unlock; |
0b99d589 LL |
510 | } |
511 | ||
512 | /* | |
513 | * If we are throttled, simply don't read any data. | |
514 | */ | |
c84a083b QL |
515 | if (ch->ch_flags & CH_FORCED_STOPI) |
516 | goto exit_unlock; | |
0b99d589 | 517 | |
100013fa | 518 | flip_len = TTY_FLIPBUF_SIZE; |
0b99d589 LL |
519 | |
520 | /* Chop down the length, if needed */ | |
521 | len = min(data_len, flip_len); | |
100013fa | 522 | len = min(len, (N_TTY_BUF_SIZE - 1)); |
0b99d589 LL |
523 | |
524 | ld = tty_ldisc_ref(tp); | |
525 | ||
0b99d589 LL |
526 | /* |
527 | * If we were unable to get a reference to the ld, | |
528 | * don't flush our buffer, and act like the ld doesn't | |
529 | * have any space to put the data right now. | |
530 | */ | |
531 | if (!ld) { | |
532 | len = 0; | |
533 | } else { | |
534 | /* | |
535 | * If ld doesn't have a pointer to a receive_buf function, | |
536 | * flush the data, then act like the ld doesn't have any | |
537 | * space to put the data right now. | |
538 | */ | |
539 | if (!ld->ops->receive_buf) { | |
540 | ch->ch_r_head = ch->ch_r_tail; | |
541 | len = 0; | |
8b07d521 | 542 | } |
0b99d589 LL |
543 | } |
544 | ||
c84a083b QL |
545 | if (len <= 0) |
546 | goto exit_unlock; | |
0b99d589 LL |
547 | |
548 | /* | |
549 | * The tty layer in the kernel has changed in 2.6.16+. | |
550 | * | |
551 | * The flip buffers in the tty structure are no longer exposed, | |
552 | * and probably will be going away eventually. | |
8b07d521 | 553 | * |
0b99d589 LL |
554 | * If we are completely raw, we don't need to go through a lot |
555 | * of the tty layers that exist. | |
556 | * In this case, we take the shortest and fastest route we | |
557 | * can to relay the data to the user. | |
558 | * | |
559 | * On the other hand, if we are not raw, we need to go through | |
560 | * the new 2.6.16+ tty layer, which has its API more well defined. | |
561 | */ | |
100013fa LL |
562 | len = tty_buffer_request_room(tp->port, len); |
563 | n = len; | |
0b99d589 | 564 | |
100013fa LL |
565 | /* |
566 | * n now contains the most amount of data we can copy, | |
567 | * bounded either by how much the Linux tty layer can handle, | |
568 | * or the amount of data the card actually has pending... | |
569 | */ | |
570 | while (n) { | |
56d118c2 DY |
571 | unsigned char *ch_pos = ch->ch_equeue + tail; |
572 | ||
100013fa LL |
573 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; |
574 | s = min(s, n); | |
0b99d589 | 575 | |
100013fa LL |
576 | if (s <= 0) |
577 | break; | |
0b99d589 LL |
578 | |
579 | /* | |
8b07d521 | 580 | * If conditions are such that ld needs to see all |
100013fa LL |
581 | * UART errors, we will have to walk each character |
582 | * and error byte and send them to the buffer one at | |
583 | * a time. | |
0b99d589 | 584 | */ |
100013fa LL |
585 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
586 | for (i = 0; i < s; i++) { | |
56d118c2 DY |
587 | unsigned char ch = *(ch_pos + i); |
588 | char flag = TTY_NORMAL; | |
589 | ||
590 | if (ch & UART_LSR_BI) | |
591 | flag = TTY_BREAK; | |
592 | else if (ch & UART_LSR_PE) | |
593 | flag = TTY_PARITY; | |
594 | else if (ch & UART_LSR_FE) | |
595 | flag = TTY_FRAME; | |
596 | ||
597 | tty_insert_flip_char(tp->port, ch, flag); | |
100013fa | 598 | } |
2000c581 | 599 | } else { |
56d118c2 | 600 | tty_insert_flip_string(tp->port, ch_pos, s); |
0b99d589 LL |
601 | } |
602 | ||
100013fa LL |
603 | tail += s; |
604 | n -= s; | |
605 | /* Flip queue if needed */ | |
606 | tail &= rmask; | |
0b99d589 | 607 | } |
0b99d589 | 608 | |
100013fa LL |
609 | ch->ch_r_tail = tail & rmask; |
610 | ch->ch_e_tail = tail & rmask; | |
611 | dgnc_check_queue_flow_control(ch); | |
a44b508a | 612 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 613 | |
100013fa LL |
614 | /* Tell the tty layer its okay to "eat" the data now */ |
615 | tty_flip_buffer_push(tp->port); | |
0b99d589 LL |
616 | |
617 | if (ld) | |
618 | tty_ldisc_deref(ld); | |
c84a083b QL |
619 | return; |
620 | ||
621 | exit_unlock: | |
5ec29365 | 622 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
c84a083b QL |
623 | if (ld) |
624 | tty_ldisc_deref(ld); | |
0b99d589 LL |
625 | } |
626 | ||
8b07d521 | 627 | /************************************************************************ |
0b99d589 | 628 | * Determines when CARRIER changes state and takes appropriate |
8b07d521 | 629 | * action. |
0b99d589 LL |
630 | ************************************************************************/ |
631 | void dgnc_carrier(struct channel_t *ch) | |
632 | { | |
90d2a471 LL |
633 | int virt_carrier = 0; |
634 | int phys_carrier = 0; | |
8b07d521 | 635 | |
0b99d589 LL |
636 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
637 | return; | |
638 | ||
f1e51745 | 639 | if (ch->ch_mistat & UART_MSR_DCD) |
0b99d589 | 640 | phys_carrier = 1; |
0b99d589 | 641 | |
50667c67 | 642 | if (ch->ch_digi.digi_flags & DIGI_FORCEDCD) |
0b99d589 | 643 | virt_carrier = 1; |
0b99d589 | 644 | |
50667c67 | 645 | if (ch->ch_c_cflag & CLOCAL) |
0b99d589 | 646 | virt_carrier = 1; |
0b99d589 | 647 | |
0b99d589 LL |
648 | /* |
649 | * Test for a VIRTUAL carrier transition to HIGH. | |
650 | */ | |
651 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
0b99d589 LL |
652 | /* |
653 | * When carrier rises, wake any threads waiting | |
654 | * for carrier in the open routine. | |
655 | */ | |
656 | ||
7df227c4 | 657 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
658 | wake_up_interruptible(&ch->ch_flags_wait); |
659 | } | |
660 | ||
661 | /* | |
662 | * Test for a PHYSICAL carrier transition to HIGH. | |
663 | */ | |
664 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
0b99d589 LL |
665 | /* |
666 | * When carrier rises, wake any threads waiting | |
667 | * for carrier in the open routine. | |
668 | */ | |
669 | ||
7df227c4 | 670 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
671 | wake_up_interruptible(&ch->ch_flags_wait); |
672 | } | |
673 | ||
674 | /* | |
675 | * Test for a PHYSICAL transition to low, so long as we aren't | |
676 | * currently ignoring physical transitions (which is what "virtual | |
677 | * carrier" indicates). | |
678 | * | |
679 | * The transition of the virtual carrier to low really doesn't | |
680 | * matter... it really only means "ignore carrier state", not | |
681 | * "make pretend that carrier is there". | |
682 | */ | |
683 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) && | |
10352c2a | 684 | (phys_carrier == 0)) { |
0b99d589 LL |
685 | /* |
686 | * When carrier drops: | |
687 | * | |
688 | * Drop carrier on all open units. | |
689 | * | |
690 | * Flush queues, waking up any task waiting in the | |
691 | * line discipline. | |
692 | * | |
693 | * Send a hangup to the control terminal. | |
694 | * | |
695 | * Enable all select calls. | |
696 | */ | |
7df227c4 | 697 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
698 | wake_up_interruptible(&ch->ch_flags_wait); |
699 | ||
f1e51745 | 700 | if (ch->ch_tun.un_open_count > 0) |
0b99d589 | 701 | tty_hangup(ch->ch_tun.un_tty); |
0b99d589 | 702 | |
f1e51745 | 703 | if (ch->ch_pun.un_open_count > 0) |
0b99d589 | 704 | tty_hangup(ch->ch_pun.un_tty); |
0b99d589 LL |
705 | } |
706 | ||
707 | /* | |
708 | * Make sure that our cached values reflect the current reality. | |
709 | */ | |
710 | if (virt_carrier == 1) | |
711 | ch->ch_flags |= CH_FCAR; | |
8b07d521 | 712 | else |
0b99d589 LL |
713 | ch->ch_flags &= ~CH_FCAR; |
714 | ||
715 | if (phys_carrier == 1) | |
716 | ch->ch_flags |= CH_CD; | |
717 | else | |
718 | ch->ch_flags &= ~CH_CD; | |
719 | } | |
720 | ||
721 | /* | |
722 | * Assign the custom baud rate to the channel structure | |
723 | */ | |
724 | static void dgnc_set_custom_speed(struct channel_t *ch, uint newrate) | |
725 | { | |
726 | int testdiv; | |
727 | int testrate_high; | |
8b07d521 | 728 | int testrate_low; |
0b99d589 LL |
729 | int deltahigh; |
730 | int deltalow; | |
731 | ||
93c76c9c DY |
732 | if (newrate <= 0) { |
733 | ch->ch_custom_speed = 0; | |
734 | return; | |
735 | } | |
0b99d589 LL |
736 | |
737 | /* | |
738 | * Since the divisor is stored in a 16-bit integer, we make sure | |
739 | * we don't allow any rates smaller than a 16-bit integer would allow. | |
740 | * And of course, rates above the dividend won't fly. | |
741 | */ | |
742 | if (newrate && newrate < ((ch->ch_bd->bd_dividend / 0xFFFF) + 1)) | |
0b7ceaa6 | 743 | newrate = (ch->ch_bd->bd_dividend / 0xFFFF) + 1; |
0b99d589 LL |
744 | |
745 | if (newrate && newrate > ch->ch_bd->bd_dividend) | |
90d2a471 | 746 | newrate = ch->ch_bd->bd_dividend; |
0b99d589 | 747 | |
93c76c9c | 748 | if (newrate > 0) { |
0b99d589 LL |
749 | testdiv = ch->ch_bd->bd_dividend / newrate; |
750 | ||
751 | /* | |
752 | * If we try to figure out what rate the board would use | |
753 | * with the test divisor, it will be either equal or higher | |
754 | * than the requested baud rate. If we then determine the | |
8b07d521 | 755 | * rate with a divisor one higher, we will get the next lower |
0b99d589 LL |
756 | * supported rate below the requested. |
757 | */ | |
758 | testrate_high = ch->ch_bd->bd_dividend / testdiv; | |
759 | testrate_low = ch->ch_bd->bd_dividend / (testdiv + 1); | |
760 | ||
761 | /* | |
762 | * If the rate for the requested divisor is correct, just | |
763 | * use it and be done. | |
764 | */ | |
93c76c9c DY |
765 | if (testrate_high != newrate) { |
766 | /* | |
851f306d CM |
767 | * Otherwise, pick the rate that is closer |
768 | * (i.e. whichever rate has a smaller delta). | |
93c76c9c DY |
769 | */ |
770 | deltahigh = testrate_high - newrate; | |
771 | deltalow = newrate - testrate_low; | |
0b99d589 | 772 | |
50667c67 | 773 | if (deltahigh < deltalow) |
93c76c9c | 774 | newrate = testrate_high; |
50667c67 | 775 | else |
93c76c9c | 776 | newrate = testrate_low; |
0b99d589 | 777 | } |
0b99d589 | 778 | } |
8b07d521 | 779 | |
0b99d589 | 780 | ch->ch_custom_speed = newrate; |
0b99d589 LL |
781 | } |
782 | ||
0b99d589 LL |
783 | void dgnc_check_queue_flow_control(struct channel_t *ch) |
784 | { | |
d09c1b96 | 785 | int qleft; |
0b99d589 LL |
786 | |
787 | /* Store how much space we have left in the queue */ | |
f7c851d4 CP |
788 | qleft = ch->ch_r_tail - ch->ch_r_head - 1; |
789 | if (qleft < 0) | |
0b99d589 LL |
790 | qleft += RQUEUEMASK + 1; |
791 | ||
792 | /* | |
793 | * Check to see if we should enforce flow control on our queue because | |
794 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
795 | * | |
796 | * NOTE: This is done based on what the current flow control of the | |
797 | * port is set for. | |
798 | * | |
799 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
800 | * This will cause the UART's FIFO to back up, and force | |
801 | * the RTS signal to be dropped. | |
802 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
803 | * the other side, in hopes it will stop sending data to us. | |
804 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
805 | * that gets sent into us when the queue fills up. | |
806 | */ | |
807 | if (qleft < 256) { | |
808 | /* HWFLOW */ | |
851f306d CM |
809 | if (ch->ch_digi.digi_flags & CTSPACE || |
810 | ch->ch_c_cflag & CRTSCTS) { | |
a82477c3 | 811 | if (!(ch->ch_flags & CH_RECEIVER_OFF)) { |
0b99d589 LL |
812 | ch->ch_bd->bd_ops->disable_receiver(ch); |
813 | ch->ch_flags |= (CH_RECEIVER_OFF); | |
0b99d589 LL |
814 | } |
815 | } | |
816 | /* SWFLOW */ | |
817 | else if (ch->ch_c_iflag & IXOFF) { | |
818 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
819 | ch->ch_bd->bd_ops->send_stop_character(ch); | |
820 | ch->ch_stops_sent++; | |
0b99d589 LL |
821 | } |
822 | } | |
0b99d589 LL |
823 | } |
824 | ||
825 | /* | |
826 | * Check to see if we should unenforce flow control because | |
827 | * ld (or user) finally read enuf data out of our queue. | |
828 | * | |
829 | * NOTE: This is done based on what the current flow control of the | |
830 | * port is set for. | |
831 | * | |
832 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
833 | * This will cause the UART's FIFO to raise RTS back up, | |
834 | * which will allow the other side to start sending data again. | |
835 | * 2) SWFLOW (IXOFF) - Send a start character to | |
836 | * the other side, so it will start sending data to us again. | |
837 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
838 | * other side, we don't need to do anything now. | |
839 | */ | |
840 | if (qleft > (RQUEUESIZE / 2)) { | |
841 | /* HWFLOW */ | |
851f306d CM |
842 | if (ch->ch_digi.digi_flags & RTSPACE || |
843 | ch->ch_c_cflag & CRTSCTS) { | |
0b99d589 LL |
844 | if (ch->ch_flags & CH_RECEIVER_OFF) { |
845 | ch->ch_bd->bd_ops->enable_receiver(ch); | |
846 | ch->ch_flags &= ~(CH_RECEIVER_OFF); | |
0b99d589 LL |
847 | } |
848 | } | |
849 | /* SWFLOW */ | |
850 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
851 | ch->ch_stops_sent = 0; | |
852 | ch->ch_bd->bd_ops->send_start_character(ch); | |
0b99d589 | 853 | } |
0b99d589 LL |
854 | } |
855 | } | |
856 | ||
0b99d589 LL |
857 | void dgnc_wakeup_writes(struct channel_t *ch) |
858 | { | |
859 | int qlen = 0; | |
a44b508a | 860 | unsigned long flags; |
0b99d589 LL |
861 | |
862 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
863 | return; | |
864 | ||
a44b508a | 865 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
866 | |
867 | /* | |
868 | * If channel now has space, wake up anyone waiting on the condition. | |
869 | */ | |
f7c851d4 CP |
870 | qlen = ch->ch_w_head - ch->ch_w_tail; |
871 | if (qlen < 0) | |
90d2a471 | 872 | qlen += WQUEUESIZE; |
0b99d589 LL |
873 | |
874 | if (qlen >= (WQUEUESIZE - 256)) { | |
a44b508a | 875 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
876 | return; |
877 | } | |
878 | ||
879 | if (ch->ch_tun.un_flags & UN_ISOPEN) { | |
6aa56785 | 880 | tty_wakeup(ch->ch_tun.un_tty); |
0b99d589 LL |
881 | |
882 | /* | |
883 | * If unit is set to wait until empty, check to make sure | |
884 | * the queue AND FIFO are both empty. | |
885 | */ | |
886 | if (ch->ch_tun.un_flags & UN_EMPTY) { | |
851f306d | 887 | if ((qlen == 0) && |
e352d3f1 | 888 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) { |
0b99d589 LL |
889 | ch->ch_tun.un_flags &= ~(UN_EMPTY); |
890 | ||
891 | /* | |
892 | * If RTS Toggle mode is on, whenever | |
893 | * the queue and UART is empty, keep RTS low. | |
894 | */ | |
895 | if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) { | |
896 | ch->ch_mostat &= ~(UART_MCR_RTS); | |
897 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
898 | } | |
899 | ||
900 | /* | |
901 | * If DTR Toggle mode is on, whenever | |
902 | * the queue and UART is empty, keep DTR low. | |
903 | */ | |
904 | if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) { | |
905 | ch->ch_mostat &= ~(UART_MCR_DTR); | |
906 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
907 | } | |
908 | } | |
909 | } | |
910 | ||
911 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); | |
912 | } | |
913 | ||
914 | if (ch->ch_pun.un_flags & UN_ISOPEN) { | |
6aa56785 | 915 | tty_wakeup(ch->ch_pun.un_tty); |
0b99d589 LL |
916 | |
917 | /* | |
918 | * If unit is set to wait until empty, check to make sure | |
919 | * the queue AND FIFO are both empty. | |
920 | */ | |
921 | if (ch->ch_pun.un_flags & UN_EMPTY) { | |
851f306d CM |
922 | if ((qlen == 0) && |
923 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) | |
0b99d589 | 924 | ch->ch_pun.un_flags &= ~(UN_EMPTY); |
0b99d589 LL |
925 | } |
926 | ||
927 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); | |
928 | } | |
929 | ||
a44b508a | 930 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
931 | } |
932 | ||
9f7a104c DY |
933 | struct dgnc_board *find_board_by_major(unsigned int major) |
934 | { | |
935 | int i; | |
936 | ||
937 | for (i = 0; i < MAXBOARDS; i++) { | |
938 | struct dgnc_board *brd = dgnc_board[i]; | |
939 | ||
940 | if (!brd) | |
941 | return NULL; | |
942 | ||
943 | if (major == brd->serial_driver->major || | |
944 | major == brd->print_driver->major) | |
945 | return brd; | |
946 | } | |
947 | ||
948 | return NULL; | |
949 | } | |
950 | ||
0b99d589 | 951 | /************************************************************************ |
8b07d521 | 952 | * |
0b99d589 | 953 | * TTY Entry points and helper functions |
8b07d521 | 954 | * |
0b99d589 LL |
955 | ************************************************************************/ |
956 | ||
957 | /* | |
958 | * dgnc_tty_open() | |
959 | * | |
960 | */ | |
961 | static int dgnc_tty_open(struct tty_struct *tty, struct file *file) | |
962 | { | |
03425f55 | 963 | struct dgnc_board *brd; |
0b99d589 LL |
964 | struct channel_t *ch; |
965 | struct un_t *un; | |
966 | uint major = 0; | |
967 | uint minor = 0; | |
968 | int rc = 0; | |
a44b508a | 969 | unsigned long flags; |
0b99d589 LL |
970 | |
971 | rc = 0; | |
972 | ||
973 | major = MAJOR(tty_devnum(tty)); | |
974 | minor = MINOR(tty_devnum(tty)); | |
975 | ||
50667c67 | 976 | if (major > 255) |
0b99d589 | 977 | return -ENXIO; |
0b99d589 LL |
978 | |
979 | /* Get board pointer from our array of majors we have allocated */ | |
9f7a104c | 980 | brd = find_board_by_major(major); |
50667c67 | 981 | if (!brd) |
0b99d589 | 982 | return -ENXIO; |
0b99d589 LL |
983 | |
984 | /* | |
985 | * If board is not yet up to a state of READY, go to | |
986 | * sleep waiting for it to happen or they cancel the open. | |
987 | */ | |
988 | rc = wait_event_interruptible(brd->state_wait, | |
e352d3f1 | 989 | (brd->state & BOARD_READY)); |
0b99d589 | 990 | |
50667c67 | 991 | if (rc) |
0b99d589 | 992 | return rc; |
0b99d589 | 993 | |
a44b508a | 994 | spin_lock_irqsave(&brd->bd_lock, flags); |
0b99d589 LL |
995 | |
996 | /* If opened device is greater than our number of ports, bail. */ | |
4bef52f3 | 997 | if (PORT_NUM(minor) >= brd->nasync) { |
a44b508a | 998 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
999 | return -ENXIO; |
1000 | } | |
1001 | ||
1002 | ch = brd->channels[PORT_NUM(minor)]; | |
1003 | if (!ch) { | |
a44b508a | 1004 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1005 | return -ENXIO; |
1006 | } | |
1007 | ||
1008 | /* Drop board lock */ | |
a44b508a | 1009 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1010 | |
1011 | /* Grab channel lock */ | |
a44b508a | 1012 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1013 | |
1014 | /* Figure out our type */ | |
1015 | if (!IS_PRINT(minor)) { | |
1016 | un = &brd->channels[PORT_NUM(minor)]->ch_tun; | |
1017 | un->un_type = DGNC_SERIAL; | |
2000c581 | 1018 | } else if (IS_PRINT(minor)) { |
0b99d589 LL |
1019 | un = &brd->channels[PORT_NUM(minor)]->ch_pun; |
1020 | un->un_type = DGNC_PRINT; | |
2000c581 | 1021 | } else { |
a44b508a | 1022 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1023 | return -ENXIO; |
1024 | } | |
1025 | ||
1026 | /* | |
1027 | * If the port is still in a previous open, and in a state | |
1028 | * where we simply cannot safely keep going, wait until the | |
1029 | * state clears. | |
1030 | */ | |
a44b508a | 1031 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1032 | |
851f306d CM |
1033 | rc = wait_event_interruptible(ch->ch_flags_wait, |
1034 | ((ch->ch_flags & CH_OPENING) == 0)); | |
0b99d589 LL |
1035 | |
1036 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 1037 | if (rc) |
0b99d589 | 1038 | return -EINTR; |
0b99d589 LL |
1039 | |
1040 | /* | |
1041 | * If either unit is in the middle of the fragile part of close, | |
1042 | * we just cannot touch the channel safely. | |
1043 | * Go to sleep, knowing that when the channel can be | |
1044 | * touched safely, the close routine will signal the | |
1045 | * ch_flags_wait to wake us back up. | |
1046 | */ | |
1047 | rc = wait_event_interruptible(ch->ch_flags_wait, | |
851f306d CM |
1048 | (((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & |
1049 | UN_CLOSING) == 0)); | |
0b99d589 LL |
1050 | |
1051 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 1052 | if (rc) |
0b99d589 | 1053 | return -EINTR; |
0b99d589 | 1054 | |
a44b508a | 1055 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1056 | |
0b99d589 LL |
1057 | /* Store our unit into driver_data, so we always have it available. */ |
1058 | tty->driver_data = un; | |
1059 | ||
0b99d589 LL |
1060 | /* |
1061 | * Initialize tty's | |
1062 | */ | |
1063 | if (!(un->un_flags & UN_ISOPEN)) { | |
1064 | /* Store important variables. */ | |
1065 | un->un_tty = tty; | |
1066 | ||
1067 | /* Maybe do something here to the TTY struct as well? */ | |
1068 | } | |
1069 | ||
0b99d589 LL |
1070 | /* |
1071 | * Allocate channel buffers for read/write/error. | |
1072 | * Set flag, so we don't get trounced on. | |
1073 | */ | |
1074 | ch->ch_flags |= (CH_OPENING); | |
1075 | ||
1076 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
a44b508a | 1077 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1078 | |
1079 | if (!ch->ch_rqueue) | |
52f9d668 | 1080 | ch->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1081 | if (!ch->ch_equeue) |
52f9d668 | 1082 | ch->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1083 | if (!ch->ch_wqueue) |
52f9d668 | 1084 | ch->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1085 | |
16f10a82 DY |
1086 | if (!ch->ch_rqueue || !ch->ch_equeue || !ch->ch_wqueue) { |
1087 | kfree(ch->ch_rqueue); | |
1088 | kfree(ch->ch_equeue); | |
1089 | kfree(ch->ch_wqueue); | |
1090 | ||
1091 | return -ENOMEM; | |
1092 | } | |
1093 | ||
a44b508a | 1094 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1095 | |
1096 | ch->ch_flags &= ~(CH_OPENING); | |
1097 | wake_up_interruptible(&ch->ch_flags_wait); | |
1098 | ||
1099 | /* | |
1100 | * Initialize if neither terminal or printer is open. | |
1101 | */ | |
1102 | if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_ISOPEN)) { | |
0b99d589 LL |
1103 | /* |
1104 | * Flush input queues. | |
1105 | */ | |
587abd7b SL |
1106 | ch->ch_r_head = 0; |
1107 | ch->ch_r_tail = 0; | |
1108 | ch->ch_e_head = 0; | |
1109 | ch->ch_e_tail = 0; | |
1110 | ch->ch_w_head = 0; | |
1111 | ch->ch_w_tail = 0; | |
0b99d589 LL |
1112 | |
1113 | brd->bd_ops->flush_uart_write(ch); | |
1114 | brd->bd_ops->flush_uart_read(ch); | |
1115 | ||
1116 | ch->ch_flags = 0; | |
1117 | ch->ch_cached_lsr = 0; | |
1118 | ch->ch_stop_sending_break = 0; | |
1119 | ch->ch_stops_sent = 0; | |
1120 | ||
22e3de76 LL |
1121 | ch->ch_c_cflag = tty->termios.c_cflag; |
1122 | ch->ch_c_iflag = tty->termios.c_iflag; | |
1123 | ch->ch_c_oflag = tty->termios.c_oflag; | |
1124 | ch->ch_c_lflag = tty->termios.c_lflag; | |
1125 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
1126 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
1127 | |
1128 | /* | |
1129 | * Bring up RTS and DTR... | |
1130 | * Also handle RTS or DTR toggle if set. | |
1131 | */ | |
1132 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
1133 | ch->ch_mostat |= (UART_MCR_RTS); | |
1134 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
1135 | ch->ch_mostat |= (UART_MCR_DTR); | |
1136 | ||
1137 | /* Tell UART to init itself */ | |
1138 | brd->bd_ops->uart_init(ch); | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * Run param in case we changed anything | |
1143 | */ | |
1144 | brd->bd_ops->param(tty); | |
1145 | ||
1146 | dgnc_carrier(ch); | |
1147 | ||
8b07d521 | 1148 | /* |
0b99d589 LL |
1149 | * follow protocol for opening port |
1150 | */ | |
1151 | ||
a44b508a | 1152 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1153 | |
1154 | rc = dgnc_block_til_ready(tty, file, ch); | |
1155 | ||
0b99d589 | 1156 | /* No going back now, increment our unit and channel counters */ |
a44b508a | 1157 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1158 | ch->ch_open_count++; |
1159 | un->un_open_count++; | |
1160 | un->un_flags |= (UN_ISOPEN); | |
a44b508a | 1161 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1162 | |
8f90ef80 | 1163 | return rc; |
0b99d589 LL |
1164 | } |
1165 | ||
8b07d521 | 1166 | /* |
0b99d589 LL |
1167 | * dgnc_block_til_ready() |
1168 | * | |
1169 | * Wait for DCD, if needed. | |
1170 | */ | |
851f306d CM |
1171 | static int dgnc_block_til_ready(struct tty_struct *tty, |
1172 | struct file *file, | |
1173 | struct channel_t *ch) | |
8b07d521 | 1174 | { |
0b99d589 | 1175 | int retval = 0; |
10334418 | 1176 | struct un_t *un = tty->driver_data; |
a44b508a | 1177 | unsigned long flags; |
0b99d589 LL |
1178 | uint old_flags = 0; |
1179 | int sleep_on_un_flags = 0; | |
1180 | ||
10334418 | 1181 | if (!file) |
8f90ef80 | 1182 | return -ENXIO; |
0b99d589 | 1183 | |
a44b508a | 1184 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1185 | |
1186 | ch->ch_wopen++; | |
1187 | ||
1188 | /* Loop forever */ | |
1189 | while (1) { | |
0b99d589 LL |
1190 | sleep_on_un_flags = 0; |
1191 | ||
1192 | /* | |
851f306d CM |
1193 | * If board has failed somehow during our sleep, |
1194 | * bail with error. | |
0b99d589 LL |
1195 | */ |
1196 | if (ch->ch_bd->state == BOARD_FAILED) { | |
1197 | retval = -ENXIO; | |
1198 | break; | |
1199 | } | |
1200 | ||
1201 | /* If tty was hung up, break out of loop and set error. */ | |
1202 | if (tty_hung_up_p(file)) { | |
1203 | retval = -EAGAIN; | |
1204 | break; | |
1205 | } | |
1206 | ||
1207 | /* | |
1208 | * If either unit is in the middle of the fragile part of close, | |
1209 | * we just cannot touch the channel safely. | |
1210 | * Go back to sleep, knowing that when the channel can be | |
8b07d521 | 1211 | * touched safely, the close routine will signal the |
0b99d589 LL |
1212 | * ch_wait_flags to wake us back up. |
1213 | */ | |
851f306d CM |
1214 | if (!((ch->ch_tun.un_flags | |
1215 | ch->ch_pun.un_flags) & | |
1216 | UN_CLOSING)) { | |
0b99d589 LL |
1217 | /* |
1218 | * Our conditions to leave cleanly and happily: | |
1219 | * 1) NONBLOCKING on the tty is set. | |
1220 | * 2) CLOCAL is set. | |
1221 | * 3) DCD (fake or real) is active. | |
1222 | */ | |
1223 | ||
50667c67 | 1224 | if (file->f_flags & O_NONBLOCK) |
0b99d589 | 1225 | break; |
0b99d589 | 1226 | |
18900ca6 | 1227 | if (tty_io_error(tty)) { |
0b99d589 LL |
1228 | retval = -EIO; |
1229 | break; | |
1230 | } | |
1231 | ||
f1e51745 | 1232 | if (ch->ch_flags & CH_CD) |
0b99d589 | 1233 | break; |
0b99d589 | 1234 | |
f1e51745 | 1235 | if (ch->ch_flags & CH_FCAR) |
0b99d589 | 1236 | break; |
2000c581 | 1237 | } else { |
0b99d589 LL |
1238 | sleep_on_un_flags = 1; |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * If there is a signal pending, the user probably | |
1243 | * interrupted (ctrl-c) us. | |
1244 | * Leave loop with error set. | |
1245 | */ | |
1246 | if (signal_pending(current)) { | |
0b99d589 LL |
1247 | retval = -ERESTARTSYS; |
1248 | break; | |
1249 | } | |
1250 | ||
0b99d589 LL |
1251 | /* |
1252 | * Store the flags before we let go of channel lock | |
1253 | */ | |
1254 | if (sleep_on_un_flags) | |
1255 | old_flags = ch->ch_tun.un_flags | ch->ch_pun.un_flags; | |
1256 | else | |
1257 | old_flags = ch->ch_flags; | |
1258 | ||
1259 | /* | |
1260 | * Let go of channel lock before calling schedule. | |
1261 | * Our poller will get any FEP events and wake us up when DCD | |
1262 | * eventually goes active. | |
1263 | */ | |
1264 | ||
a44b508a | 1265 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1266 | |
0b99d589 | 1267 | /* |
851f306d CM |
1268 | * Wait for something in the flags to change |
1269 | * from the current value. | |
0b99d589 | 1270 | */ |
50667c67 | 1271 | if (sleep_on_un_flags) |
0b99d589 | 1272 | retval = wait_event_interruptible(un->un_flags_wait, |
851f306d CM |
1273 | (old_flags != (ch->ch_tun.un_flags | |
1274 | ch->ch_pun.un_flags))); | |
50667c67 | 1275 | else |
0b99d589 LL |
1276 | retval = wait_event_interruptible(ch->ch_flags_wait, |
1277 | (old_flags != ch->ch_flags)); | |
0b99d589 | 1278 | |
0b99d589 LL |
1279 | /* |
1280 | * We got woken up for some reason. | |
1281 | * Before looping around, grab our channel lock. | |
1282 | */ | |
a44b508a | 1283 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1284 | } |
1285 | ||
1286 | ch->ch_wopen--; | |
1287 | ||
a44b508a | 1288 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1289 | |
36e712a8 | 1290 | return retval; |
0b99d589 LL |
1291 | } |
1292 | ||
0b99d589 LL |
1293 | /* |
1294 | * dgnc_tty_hangup() | |
1295 | * | |
1296 | * Hangup the port. Like a close, but don't wait for output to drain. | |
8b07d521 | 1297 | */ |
0b99d589 LL |
1298 | static void dgnc_tty_hangup(struct tty_struct *tty) |
1299 | { | |
0b99d589 LL |
1300 | if (!tty || tty->magic != TTY_MAGIC) |
1301 | return; | |
1302 | ||
0b99d589 LL |
1303 | /* flush the transmit queues */ |
1304 | dgnc_tty_flush_buffer(tty); | |
0b99d589 LL |
1305 | } |
1306 | ||
0b99d589 LL |
1307 | /* |
1308 | * dgnc_tty_close() | |
1309 | * | |
1310 | */ | |
1311 | static void dgnc_tty_close(struct tty_struct *tty, struct file *file) | |
1312 | { | |
03425f55 | 1313 | struct dgnc_board *bd; |
0b99d589 LL |
1314 | struct channel_t *ch; |
1315 | struct un_t *un; | |
a44b508a | 1316 | unsigned long flags; |
0b99d589 LL |
1317 | |
1318 | if (!tty || tty->magic != TTY_MAGIC) | |
1319 | return; | |
1320 | ||
1321 | un = tty->driver_data; | |
1322 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1323 | return; | |
1324 | ||
1325 | ch = un->un_ch; | |
1326 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1327 | return; | |
1328 | ||
1329 | bd = ch->ch_bd; | |
1330 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1331 | return; | |
1332 | ||
a44b508a | 1333 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1334 | |
1335 | /* | |
1336 | * Determine if this is the last close or not - and if we agree about | |
1337 | * which type of close it is with the Line Discipline | |
1338 | */ | |
1339 | if ((tty->count == 1) && (un->un_open_count != 1)) { | |
1340 | /* | |
1341 | * Uh, oh. tty->count is 1, which means that the tty | |
1342 | * structure will be freed. un_open_count should always | |
1343 | * be one in these conditions. If it's greater than | |
1344 | * one, we've got real problems, since it means the | |
1345 | * serial port won't be shutdown. | |
1346 | */ | |
1f26adc9 RD |
1347 | dev_dbg(tty->dev, |
1348 | "tty->count is 1, un open count is %d\n", | |
1349 | un->un_open_count); | |
0b99d589 | 1350 | un->un_open_count = 1; |
8b07d521 | 1351 | } |
0b99d589 | 1352 | |
3098e514 DY |
1353 | if (un->un_open_count) |
1354 | un->un_open_count--; | |
1355 | else | |
1f26adc9 RD |
1356 | dev_dbg(tty->dev, |
1357 | "bad serial port open count of %d\n", | |
1358 | un->un_open_count); | |
0b99d589 LL |
1359 | |
1360 | ch->ch_open_count--; | |
1361 | ||
1362 | if (ch->ch_open_count && un->un_open_count) { | |
a44b508a | 1363 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
90d2a471 LL |
1364 | return; |
1365 | } | |
0b99d589 LL |
1366 | |
1367 | /* OK, its the last close on the unit */ | |
0b99d589 LL |
1368 | un->un_flags |= UN_CLOSING; |
1369 | ||
1370 | tty->closing = 1; | |
1371 | ||
0b99d589 LL |
1372 | /* |
1373 | * Only officially close channel if count is 0 and | |
90d2a471 | 1374 | * DIGI_PRINTER bit is not set. |
0b99d589 | 1375 | */ |
851f306d CM |
1376 | if ((ch->ch_open_count == 0) && |
1377 | !(ch->ch_digi.digi_flags & DIGI_PRINTER)) { | |
0b99d589 LL |
1378 | ch->ch_flags &= ~(CH_STOPI | CH_FORCED_STOPI); |
1379 | ||
1380 | /* | |
1381 | * turn off print device when closing print device. | |
1382 | */ | |
9cdf838b | 1383 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1384 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1385 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1386 | ch->ch_flags &= ~CH_PRON; |
1387 | } | |
1388 | ||
a44b508a | 1389 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1390 | /* wait for output to drain */ |
1391 | /* This will also return if we take an interrupt */ | |
1392 | ||
2d9920ec | 1393 | bd->bd_ops->drain(tty, 0); |
0b99d589 | 1394 | |
0b99d589 LL |
1395 | dgnc_tty_flush_buffer(tty); |
1396 | tty_ldisc_flush(tty); | |
1397 | ||
a44b508a | 1398 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1399 | |
1400 | tty->closing = 0; | |
1401 | ||
1402 | /* | |
1403 | * If we have HUPCL set, lower DTR and RTS | |
1404 | */ | |
1405 | if (ch->ch_c_cflag & HUPCL) { | |
0b99d589 LL |
1406 | /* Drop RTS/DTR */ |
1407 | ch->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
1408 | bd->bd_ops->assert_modem_signals(ch); | |
1409 | ||
1410 | /* | |
8b07d521 | 1411 | * Go to sleep to ensure RTS/DTR |
0b99d589 LL |
1412 | * have been dropped for modems to see it. |
1413 | */ | |
1414 | if (ch->ch_close_delay) { | |
a44b508a RD |
1415 | spin_unlock_irqrestore(&ch->ch_lock, |
1416 | flags); | |
0b99d589 | 1417 | dgnc_ms_sleep(ch->ch_close_delay); |
a44b508a | 1418 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1419 | } |
1420 | } | |
1421 | ||
1422 | ch->ch_old_baud = 0; | |
1423 | ||
1424 | /* Turn off UART interrupts for this port */ | |
1425 | ch->ch_bd->bd_ops->uart_off(ch); | |
2000c581 | 1426 | } else { |
0b99d589 LL |
1427 | /* |
1428 | * turn off print device when closing print device. | |
1429 | */ | |
9cdf838b | 1430 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1431 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1432 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1433 | ch->ch_flags &= ~CH_PRON; |
1434 | } | |
1435 | } | |
1436 | ||
1437 | un->un_tty = NULL; | |
1438 | un->un_flags &= ~(UN_ISOPEN | UN_CLOSING); | |
1439 | ||
0b99d589 LL |
1440 | wake_up_interruptible(&ch->ch_flags_wait); |
1441 | wake_up_interruptible(&un->un_flags_wait); | |
1442 | ||
a44b508a | 1443 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1444 | } |
1445 | ||
0b99d589 LL |
1446 | /* |
1447 | * dgnc_tty_chars_in_buffer() | |
1448 | * | |
1449 | * Return number of characters that have not been transmitted yet. | |
1450 | * | |
1451 | * This routine is used by the line discipline to determine if there | |
1452 | * is data waiting to be transmitted/drained/flushed or not. | |
1453 | */ | |
1454 | static int dgnc_tty_chars_in_buffer(struct tty_struct *tty) | |
1455 | { | |
1456 | struct channel_t *ch = NULL; | |
1457 | struct un_t *un = NULL; | |
1458 | ushort thead; | |
1459 | ushort ttail; | |
1460 | uint tmask; | |
1461 | uint chars = 0; | |
a44b508a | 1462 | unsigned long flags; |
0b99d589 | 1463 | |
60acb623 | 1464 | if (!tty) |
8f90ef80 | 1465 | return 0; |
0b99d589 LL |
1466 | |
1467 | un = tty->driver_data; | |
1468 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1469 | return 0; |
0b99d589 LL |
1470 | |
1471 | ch = un->un_ch; | |
1472 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1473 | return 0; |
0b99d589 | 1474 | |
a44b508a | 1475 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1476 | |
1477 | tmask = WQUEUEMASK; | |
1478 | thead = ch->ch_w_head & tmask; | |
1479 | ttail = ch->ch_w_tail & tmask; | |
1480 | ||
a44b508a | 1481 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1482 | |
1483 | if (ttail == thead) { | |
1484 | chars = 0; | |
1485 | } else { | |
1486 | if (thead >= ttail) | |
1487 | chars = thead - ttail; | |
1488 | else | |
1489 | chars = thead - ttail + WQUEUESIZE; | |
1490 | } | |
1491 | ||
8f90ef80 | 1492 | return chars; |
0b99d589 LL |
1493 | } |
1494 | ||
8b07d521 | 1495 | /* |
0b99d589 LL |
1496 | * dgnc_maxcps_room |
1497 | * | |
1498 | * Reduces bytes_available to the max number of characters | |
1499 | * that can be sent currently given the maxcps value, and | |
1500 | * returns the new bytes_available. This only affects printer | |
1501 | * output. | |
8b07d521 | 1502 | */ |
107b40ad | 1503 | static int dgnc_maxcps_room(struct channel_t *ch, int bytes_available) |
0b99d589 | 1504 | { |
9cdf838b | 1505 | if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0) { |
0b99d589 LL |
1506 | int cps_limit = 0; |
1507 | unsigned long current_time = jiffies; | |
1508 | unsigned long buffer_time = current_time + | |
851f306d CM |
1509 | (HZ * ch->ch_digi.digi_bufsize) / |
1510 | ch->ch_digi.digi_maxcps; | |
0b99d589 LL |
1511 | |
1512 | if (ch->ch_cpstime < current_time) { | |
1513 | /* buffer is empty */ | |
851f306d | 1514 | ch->ch_cpstime = current_time; /* reset ch_cpstime */ |
0b99d589 | 1515 | cps_limit = ch->ch_digi.digi_bufsize; |
2000c581 | 1516 | } else if (ch->ch_cpstime < buffer_time) { |
0b99d589 | 1517 | /* still room in the buffer */ |
851f306d CM |
1518 | cps_limit = ((buffer_time - ch->ch_cpstime) * |
1519 | ch->ch_digi.digi_maxcps) / HZ; | |
2000c581 | 1520 | } else { |
0b99d589 | 1521 | /* no room in the buffer */ |
8b07d521 | 1522 | cps_limit = 0; |
0b99d589 LL |
1523 | } |
1524 | ||
1525 | bytes_available = min(cps_limit, bytes_available); | |
1526 | } | |
1527 | ||
8f90ef80 | 1528 | return bytes_available; |
0b99d589 LL |
1529 | } |
1530 | ||
0b99d589 LL |
1531 | /* |
1532 | * dgnc_tty_write_room() | |
1533 | * | |
1534 | * Return space available in Tx buffer | |
8b07d521 | 1535 | */ |
0b99d589 LL |
1536 | static int dgnc_tty_write_room(struct tty_struct *tty) |
1537 | { | |
1538 | struct channel_t *ch = NULL; | |
1539 | struct un_t *un = NULL; | |
1540 | ushort head; | |
1541 | ushort tail; | |
1542 | ushort tmask; | |
1543 | int ret = 0; | |
a44b508a | 1544 | unsigned long flags; |
0b99d589 | 1545 | |
60acb623 | 1546 | if (!tty || !dgnc_TmpWriteBuf) |
8f90ef80 | 1547 | return 0; |
0b99d589 LL |
1548 | |
1549 | un = tty->driver_data; | |
1550 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1551 | return 0; |
0b99d589 LL |
1552 | |
1553 | ch = un->un_ch; | |
1554 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1555 | return 0; |
0b99d589 | 1556 | |
a44b508a | 1557 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1558 | |
1559 | tmask = WQUEUEMASK; | |
1560 | head = (ch->ch_w_head) & tmask; | |
1561 | tail = (ch->ch_w_tail) & tmask; | |
1562 | ||
f7c851d4 CP |
1563 | ret = tail - head - 1; |
1564 | if (ret < 0) | |
0b99d589 LL |
1565 | ret += WQUEUESIZE; |
1566 | ||
1567 | /* Limit printer to maxcps */ | |
107b40ad DY |
1568 | if (un->un_type != DGNC_PRINT) |
1569 | ret = dgnc_maxcps_room(ch, ret); | |
0b99d589 LL |
1570 | |
1571 | /* | |
8b07d521 | 1572 | * If we are printer device, leave space for |
0b99d589 LL |
1573 | * possibly both the on and off strings. |
1574 | */ | |
1575 | if (un->un_type == DGNC_PRINT) { | |
1576 | if (!(ch->ch_flags & CH_PRON)) | |
1577 | ret -= ch->ch_digi.digi_onlen; | |
1578 | ret -= ch->ch_digi.digi_offlen; | |
2000c581 | 1579 | } else { |
0b99d589 LL |
1580 | if (ch->ch_flags & CH_PRON) |
1581 | ret -= ch->ch_digi.digi_offlen; | |
1582 | } | |
1583 | ||
1584 | if (ret < 0) | |
1585 | ret = 0; | |
1586 | ||
a44b508a | 1587 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8b07d521 | 1588 | |
8f90ef80 | 1589 | return ret; |
0b99d589 LL |
1590 | } |
1591 | ||
0b99d589 LL |
1592 | /* |
1593 | * dgnc_tty_put_char() | |
1594 | * | |
1595 | * Put a character into ch->ch_buf | |
8b07d521 | 1596 | * |
0b99d589 LL |
1597 | * - used by the line discipline for OPOST processing |
1598 | */ | |
1599 | static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c) | |
1600 | { | |
1601 | /* | |
1602 | * Simply call tty_write. | |
1603 | */ | |
0b99d589 LL |
1604 | dgnc_tty_write(tty, &c, 1); |
1605 | return 1; | |
1606 | } | |
1607 | ||
0b99d589 LL |
1608 | /* |
1609 | * dgnc_tty_write() | |
1610 | * | |
1611 | * Take data from the user or kernel and send it out to the FEP. | |
1612 | * In here exists all the Transparent Print magic as well. | |
1613 | */ | |
1614 | static int dgnc_tty_write(struct tty_struct *tty, | |
e352d3f1 | 1615 | const unsigned char *buf, int count) |
0b99d589 LL |
1616 | { |
1617 | struct channel_t *ch = NULL; | |
1618 | struct un_t *un = NULL; | |
1619 | int bufcount = 0, n = 0; | |
a44b508a | 1620 | unsigned long flags; |
0b99d589 LL |
1621 | ushort head; |
1622 | ushort tail; | |
1623 | ushort tmask; | |
1624 | uint remain; | |
0b99d589 | 1625 | |
60acb623 | 1626 | if (!tty || !dgnc_TmpWriteBuf) |
8f90ef80 | 1627 | return 0; |
0b99d589 LL |
1628 | |
1629 | un = tty->driver_data; | |
1630 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1631 | return 0; |
0b99d589 LL |
1632 | |
1633 | ch = un->un_ch; | |
1634 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1635 | return 0; |
0b99d589 LL |
1636 | |
1637 | if (!count) | |
8f90ef80 | 1638 | return 0; |
0b99d589 | 1639 | |
0b99d589 LL |
1640 | /* |
1641 | * Store original amount of characters passed in. | |
1642 | * This helps to figure out if we should ask the FEP | |
1643 | * to send us an event when it has more space available. | |
1644 | */ | |
0b99d589 | 1645 | |
a44b508a | 1646 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1647 | |
1648 | /* Get our space available for the channel from the board */ | |
1649 | tmask = WQUEUEMASK; | |
1650 | head = (ch->ch_w_head) & tmask; | |
1651 | tail = (ch->ch_w_tail) & tmask; | |
1652 | ||
f7c851d4 CP |
1653 | bufcount = tail - head - 1; |
1654 | if (bufcount < 0) | |
0b99d589 LL |
1655 | bufcount += WQUEUESIZE; |
1656 | ||
0b99d589 LL |
1657 | /* |
1658 | * Limit printer output to maxcps overall, with bursts allowed | |
1659 | * up to bufsize characters. | |
1660 | */ | |
107b40ad DY |
1661 | if (un->un_type != DGNC_PRINT) |
1662 | bufcount = dgnc_maxcps_room(ch, bufcount); | |
0b99d589 LL |
1663 | |
1664 | /* | |
1665 | * Take minimum of what the user wants to send, and the | |
1666 | * space available in the FEP buffer. | |
1667 | */ | |
1668 | count = min(count, bufcount); | |
1669 | ||
1670 | /* | |
1671 | * Bail if no space left. | |
1672 | */ | |
c84a083b QL |
1673 | if (count <= 0) |
1674 | goto exit_retry; | |
0b99d589 LL |
1675 | |
1676 | /* | |
1677 | * Output the printer ON string, if we are in terminal mode, but | |
1678 | * need to be in printer mode. | |
1679 | */ | |
1680 | if ((un->un_type == DGNC_PRINT) && !(ch->ch_flags & CH_PRON)) { | |
1681 | dgnc_wmove(ch, ch->ch_digi.digi_onstr, | |
e352d3f1 | 1682 | (int)ch->ch_digi.digi_onlen); |
0b99d589 LL |
1683 | head = (ch->ch_w_head) & tmask; |
1684 | ch->ch_flags |= CH_PRON; | |
1685 | } | |
1686 | ||
1687 | /* | |
1688 | * On the other hand, output the printer OFF string, if we are | |
1689 | * currently in printer mode, but need to output to the terminal. | |
1690 | */ | |
1691 | if ((un->un_type != DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { | |
1692 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, | |
e352d3f1 | 1693 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1694 | head = (ch->ch_w_head) & tmask; |
1695 | ch->ch_flags &= ~CH_PRON; | |
1696 | } | |
1697 | ||
0b99d589 LL |
1698 | n = count; |
1699 | ||
1700 | /* | |
1701 | * If the write wraps over the top of the circular buffer, | |
1702 | * move the portion up to the wrap point, and reset the | |
1703 | * pointers to the bottom. | |
1704 | */ | |
1705 | remain = WQUEUESIZE - head; | |
1706 | ||
1707 | if (n >= remain) { | |
1708 | n -= remain; | |
1709 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1710 | head = 0; |
1711 | buf += remain; | |
1712 | } | |
1713 | ||
1714 | if (n > 0) { | |
1715 | /* | |
1716 | * Move rest of data. | |
1717 | */ | |
1718 | remain = n; | |
1719 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1720 | head += remain; |
1721 | } | |
1722 | ||
1723 | if (count) { | |
1724 | head &= tmask; | |
1725 | ch->ch_w_head = head; | |
1726 | } | |
1727 | ||
0b99d589 | 1728 | /* Update printer buffer empty time. */ |
8d0d4cc5 RS |
1729 | if ((un->un_type == DGNC_PRINT) && (ch->ch_digi.digi_maxcps > 0) && |
1730 | (ch->ch_digi.digi_bufsize > 0)) { | |
90d2a471 | 1731 | ch->ch_cpstime += (HZ * count) / ch->ch_digi.digi_maxcps; |
0b99d589 LL |
1732 | } |
1733 | ||
a74d8e21 | 1734 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1735 | |
0b99d589 LL |
1736 | if (count) { |
1737 | /* | |
1738 | * Channel lock is grabbed and then released | |
1739 | * inside this routine. | |
1740 | */ | |
1741 | ch->ch_bd->bd_ops->copy_data_from_queue_to_uart(ch); | |
1742 | } | |
1743 | ||
8f90ef80 | 1744 | return count; |
c84a083b QL |
1745 | |
1746 | exit_retry: | |
1747 | ||
1748 | spin_unlock_irqrestore(&ch->ch_lock, flags); | |
1749 | return 0; | |
0b99d589 LL |
1750 | } |
1751 | ||
0b99d589 LL |
1752 | /* |
1753 | * Return modem signals to ld. | |
1754 | */ | |
b74c7461 | 1755 | |
0b99d589 | 1756 | static int dgnc_tty_tiocmget(struct tty_struct *tty) |
0b99d589 LL |
1757 | { |
1758 | struct channel_t *ch; | |
1759 | struct un_t *un; | |
1760 | int result = -EIO; | |
446393e9 | 1761 | unsigned char mstat = 0; |
a44b508a | 1762 | unsigned long flags; |
0b99d589 LL |
1763 | |
1764 | if (!tty || tty->magic != TTY_MAGIC) | |
1765 | return result; | |
1766 | ||
1767 | un = tty->driver_data; | |
1768 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1769 | return result; | |
1770 | ||
1771 | ch = un->un_ch; | |
1772 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1773 | return result; | |
1774 | ||
a44b508a | 1775 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1776 | |
0b7ceaa6 | 1777 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1778 | |
a44b508a | 1779 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1780 | |
1781 | result = 0; | |
1782 | ||
1783 | if (mstat & UART_MCR_DTR) | |
1784 | result |= TIOCM_DTR; | |
1785 | if (mstat & UART_MCR_RTS) | |
1786 | result |= TIOCM_RTS; | |
1787 | if (mstat & UART_MSR_CTS) | |
1788 | result |= TIOCM_CTS; | |
1789 | if (mstat & UART_MSR_DSR) | |
1790 | result |= TIOCM_DSR; | |
1791 | if (mstat & UART_MSR_RI) | |
1792 | result |= TIOCM_RI; | |
1793 | if (mstat & UART_MSR_DCD) | |
1794 | result |= TIOCM_CD; | |
1795 | ||
0b99d589 LL |
1796 | return result; |
1797 | } | |
1798 | ||
0b99d589 LL |
1799 | /* |
1800 | * dgnc_tty_tiocmset() | |
1801 | * | |
1802 | * Set modem signals, called by ld. | |
1803 | */ | |
b74c7461 | 1804 | |
0b99d589 | 1805 | static int dgnc_tty_tiocmset(struct tty_struct *tty, |
e352d3f1 | 1806 | unsigned int set, unsigned int clear) |
0b99d589 | 1807 | { |
03425f55 | 1808 | struct dgnc_board *bd; |
0b99d589 LL |
1809 | struct channel_t *ch; |
1810 | struct un_t *un; | |
1811 | int ret = -EIO; | |
a44b508a | 1812 | unsigned long flags; |
0b99d589 LL |
1813 | |
1814 | if (!tty || tty->magic != TTY_MAGIC) | |
1815 | return ret; | |
1816 | ||
1817 | un = tty->driver_data; | |
1818 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1819 | return ret; | |
1820 | ||
1821 | ch = un->un_ch; | |
1822 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1823 | return ret; | |
1824 | ||
1825 | bd = ch->ch_bd; | |
1826 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1827 | return ret; | |
1828 | ||
a44b508a | 1829 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1830 | |
50667c67 | 1831 | if (set & TIOCM_RTS) |
0b99d589 | 1832 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 1833 | |
50667c67 | 1834 | if (set & TIOCM_DTR) |
0b99d589 | 1835 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 | 1836 | |
50667c67 | 1837 | if (clear & TIOCM_RTS) |
0b99d589 | 1838 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 1839 | |
50667c67 | 1840 | if (clear & TIOCM_DTR) |
0b99d589 | 1841 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
1842 | |
1843 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
1844 | ||
a44b508a | 1845 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1846 | |
8f90ef80 | 1847 | return 0; |
0b99d589 LL |
1848 | } |
1849 | ||
0b99d589 LL |
1850 | /* |
1851 | * dgnc_tty_send_break() | |
1852 | * | |
1853 | * Send a Break, called by ld. | |
1854 | */ | |
1855 | static int dgnc_tty_send_break(struct tty_struct *tty, int msec) | |
1856 | { | |
03425f55 | 1857 | struct dgnc_board *bd; |
0b99d589 LL |
1858 | struct channel_t *ch; |
1859 | struct un_t *un; | |
1860 | int ret = -EIO; | |
a44b508a | 1861 | unsigned long flags; |
0b99d589 LL |
1862 | |
1863 | if (!tty || tty->magic != TTY_MAGIC) | |
1864 | return ret; | |
1865 | ||
1866 | un = tty->driver_data; | |
1867 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1868 | return ret; | |
1869 | ||
1870 | ch = un->un_ch; | |
1871 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1872 | return ret; | |
1873 | ||
1874 | bd = ch->ch_bd; | |
1875 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1876 | return ret; | |
1877 | ||
1878 | switch (msec) { | |
1879 | case -1: | |
1880 | msec = 0xFFFF; | |
1881 | break; | |
1882 | case 0: | |
1883 | msec = 0; | |
1884 | break; | |
1885 | default: | |
1886 | break; | |
1887 | } | |
1888 | ||
a44b508a | 1889 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1890 | |
1891 | ch->ch_bd->bd_ops->send_break(ch, msec); | |
1892 | ||
a44b508a | 1893 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1894 | |
8f90ef80 | 1895 | return 0; |
0b99d589 LL |
1896 | } |
1897 | ||
0b99d589 LL |
1898 | /* |
1899 | * dgnc_tty_wait_until_sent() | |
1900 | * | |
1901 | * wait until data has been transmitted, called by ld. | |
1902 | */ | |
1903 | static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
1904 | { | |
03425f55 | 1905 | struct dgnc_board *bd; |
0b99d589 LL |
1906 | struct channel_t *ch; |
1907 | struct un_t *un; | |
0b99d589 LL |
1908 | |
1909 | if (!tty || tty->magic != TTY_MAGIC) | |
1910 | return; | |
1911 | ||
1912 | un = tty->driver_data; | |
1913 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1914 | return; | |
1915 | ||
1916 | ch = un->un_ch; | |
1917 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1918 | return; | |
1919 | ||
1920 | bd = ch->ch_bd; | |
1921 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1922 | return; | |
1923 | ||
2d9920ec | 1924 | bd->bd_ops->drain(tty, 0); |
8b07d521 | 1925 | } |
0b99d589 | 1926 | |
0b99d589 LL |
1927 | /* |
1928 | * dgnc_send_xchar() | |
1929 | * | |
1930 | * send a high priority character, called by ld. | |
1931 | */ | |
1932 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char c) | |
1933 | { | |
03425f55 | 1934 | struct dgnc_board *bd; |
0b99d589 LL |
1935 | struct channel_t *ch; |
1936 | struct un_t *un; | |
a44b508a | 1937 | unsigned long flags; |
0b99d589 LL |
1938 | |
1939 | if (!tty || tty->magic != TTY_MAGIC) | |
1940 | return; | |
1941 | ||
1942 | un = tty->driver_data; | |
1943 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1944 | return; | |
1945 | ||
1946 | ch = un->un_ch; | |
1947 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1948 | return; | |
1949 | ||
1950 | bd = ch->ch_bd; | |
1951 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1952 | return; | |
1953 | ||
f3dadd29 | 1954 | dev_dbg(tty->dev, "dgnc_tty_send_xchar start\n"); |
0b99d589 | 1955 | |
a44b508a | 1956 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1957 | bd->bd_ops->send_immediate_char(ch, c); |
a44b508a | 1958 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1959 | |
f3dadd29 | 1960 | dev_dbg(tty->dev, "dgnc_tty_send_xchar finish\n"); |
8b07d521 | 1961 | } |
0b99d589 | 1962 | |
0b99d589 LL |
1963 | /* |
1964 | * Return modem signals to ld. | |
1965 | */ | |
1966 | static inline int dgnc_get_mstat(struct channel_t *ch) | |
1967 | { | |
1968 | unsigned char mstat; | |
290e3aba | 1969 | int result = 0; |
a44b508a | 1970 | unsigned long flags; |
0b99d589 | 1971 | |
0b99d589 | 1972 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
8f90ef80 | 1973 | return -ENXIO; |
0b99d589 | 1974 | |
a44b508a | 1975 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1976 | |
0b7ceaa6 | 1977 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1978 | |
a44b508a | 1979 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1980 | |
0b99d589 LL |
1981 | if (mstat & UART_MCR_DTR) |
1982 | result |= TIOCM_DTR; | |
1983 | if (mstat & UART_MCR_RTS) | |
1984 | result |= TIOCM_RTS; | |
1985 | if (mstat & UART_MSR_CTS) | |
1986 | result |= TIOCM_CTS; | |
1987 | if (mstat & UART_MSR_DSR) | |
1988 | result |= TIOCM_DSR; | |
1989 | if (mstat & UART_MSR_RI) | |
1990 | result |= TIOCM_RI; | |
1991 | if (mstat & UART_MSR_DCD) | |
1992 | result |= TIOCM_CD; | |
1993 | ||
8f90ef80 | 1994 | return result; |
0b99d589 LL |
1995 | } |
1996 | ||
0b99d589 LL |
1997 | /* |
1998 | * Return modem signals to ld. | |
1999 | */ | |
851f306d CM |
2000 | static int dgnc_get_modem_info(struct channel_t *ch, |
2001 | unsigned int __user *value) | |
0b99d589 | 2002 | { |
a5b90ef7 | 2003 | return put_user(dgnc_get_mstat(ch), value); |
0b99d589 LL |
2004 | } |
2005 | ||
0b99d589 LL |
2006 | /* |
2007 | * dgnc_set_modem_info() | |
2008 | * | |
2009 | * Set modem signals, called by ld. | |
2010 | */ | |
c23b48e0 | 2011 | static int dgnc_set_modem_info(struct channel_t *ch, |
851f306d CM |
2012 | unsigned int command, |
2013 | unsigned int __user *value) | |
0b99d589 | 2014 | { |
0b99d589 LL |
2015 | int ret = -ENXIO; |
2016 | unsigned int arg = 0; | |
a44b508a | 2017 | unsigned long flags; |
0b99d589 | 2018 | |
0b99d589 LL |
2019 | ret = get_user(arg, value); |
2020 | if (ret) | |
8f90ef80 | 2021 | return ret; |
0b99d589 LL |
2022 | |
2023 | switch (command) { | |
2024 | case TIOCMBIS: | |
50667c67 | 2025 | if (arg & TIOCM_RTS) |
0b99d589 | 2026 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 2027 | |
50667c67 | 2028 | if (arg & TIOCM_DTR) |
0b99d589 | 2029 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 LL |
2030 | |
2031 | break; | |
2032 | ||
2033 | case TIOCMBIC: | |
50667c67 | 2034 | if (arg & TIOCM_RTS) |
0b99d589 | 2035 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 2036 | |
50667c67 | 2037 | if (arg & TIOCM_DTR) |
0b99d589 | 2038 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
2039 | |
2040 | break; | |
2041 | ||
90d2a471 | 2042 | case TIOCMSET: |
0b99d589 | 2043 | |
50667c67 | 2044 | if (arg & TIOCM_RTS) |
0b99d589 | 2045 | ch->ch_mostat |= UART_MCR_RTS; |
50667c67 | 2046 | else |
0b99d589 | 2047 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 2048 | |
50667c67 | 2049 | if (arg & TIOCM_DTR) |
0b99d589 | 2050 | ch->ch_mostat |= UART_MCR_DTR; |
50667c67 | 2051 | else |
0b99d589 | 2052 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
2053 | |
2054 | break; | |
2055 | ||
2056 | default: | |
8f90ef80 | 2057 | return -EINVAL; |
0b99d589 LL |
2058 | } |
2059 | ||
a44b508a | 2060 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2061 | |
2062 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
2063 | ||
a44b508a | 2064 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2065 | |
8f90ef80 | 2066 | return 0; |
0b99d589 LL |
2067 | } |
2068 | ||
0b99d589 | 2069 | /* |
8b07d521 | 2070 | * dgnc_tty_digigeta() |
0b99d589 LL |
2071 | * |
2072 | * Ioctl to get the information for ditty. | |
2073 | * | |
2074 | * | |
2075 | * | |
2076 | */ | |
851f306d CM |
2077 | static int dgnc_tty_digigeta(struct tty_struct *tty, |
2078 | struct digi_t __user *retinfo) | |
0b99d589 LL |
2079 | { |
2080 | struct channel_t *ch; | |
2081 | struct un_t *un; | |
2082 | struct digi_t tmp; | |
a44b508a | 2083 | unsigned long flags; |
0b99d589 LL |
2084 | |
2085 | if (!retinfo) | |
8f90ef80 | 2086 | return -EFAULT; |
0b99d589 LL |
2087 | |
2088 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2089 | return -EFAULT; |
0b99d589 LL |
2090 | |
2091 | un = tty->driver_data; | |
2092 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2093 | return -EFAULT; |
0b99d589 LL |
2094 | |
2095 | ch = un->un_ch; | |
2096 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2097 | return -EFAULT; |
0b99d589 LL |
2098 | |
2099 | memset(&tmp, 0, sizeof(tmp)); | |
2100 | ||
a44b508a | 2101 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2102 | memcpy(&tmp, &ch->ch_digi, sizeof(tmp)); |
a44b508a | 2103 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2104 | |
2105 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) | |
8f90ef80 | 2106 | return -EFAULT; |
0b99d589 | 2107 | |
8f90ef80 | 2108 | return 0; |
0b99d589 LL |
2109 | } |
2110 | ||
0b99d589 | 2111 | /* |
8b07d521 | 2112 | * dgnc_tty_digiseta() |
0b99d589 LL |
2113 | * |
2114 | * Ioctl to set the information for ditty. | |
2115 | * | |
2116 | * | |
2117 | * | |
2118 | */ | |
851f306d CM |
2119 | static int dgnc_tty_digiseta(struct tty_struct *tty, |
2120 | struct digi_t __user *new_info) | |
0b99d589 | 2121 | { |
03425f55 | 2122 | struct dgnc_board *bd; |
0b99d589 LL |
2123 | struct channel_t *ch; |
2124 | struct un_t *un; | |
2125 | struct digi_t new_digi; | |
a44b508a | 2126 | unsigned long flags; |
0b99d589 | 2127 | |
0b99d589 | 2128 | if (!tty || tty->magic != TTY_MAGIC) |
8f90ef80 | 2129 | return -EFAULT; |
0b99d589 LL |
2130 | |
2131 | un = tty->driver_data; | |
2132 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2133 | return -EFAULT; |
0b99d589 LL |
2134 | |
2135 | ch = un->un_ch; | |
2136 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2137 | return -EFAULT; |
0b99d589 LL |
2138 | |
2139 | bd = ch->ch_bd; | |
2140 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2141 | return -EFAULT; |
0b99d589 | 2142 | |
f1e51745 | 2143 | if (copy_from_user(&new_digi, new_info, sizeof(new_digi))) |
8f90ef80 | 2144 | return -EFAULT; |
0b99d589 | 2145 | |
a44b508a | 2146 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2147 | |
2148 | /* | |
2149 | * Handle transistions to and from RTS Toggle. | |
2150 | */ | |
851f306d CM |
2151 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2152 | (new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 | 2153 | ch->ch_mostat &= ~(UART_MCR_RTS); |
851f306d CM |
2154 | if ((ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2155 | !(new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 LL |
2156 | ch->ch_mostat |= (UART_MCR_RTS); |
2157 | ||
2158 | /* | |
2159 | * Handle transistions to and from DTR Toggle. | |
2160 | */ | |
851f306d CM |
2161 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2162 | (new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 | 2163 | ch->ch_mostat &= ~(UART_MCR_DTR); |
851f306d CM |
2164 | if ((ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2165 | !(new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 LL |
2166 | ch->ch_mostat |= (UART_MCR_DTR); |
2167 | ||
a07bf39a | 2168 | memcpy(&ch->ch_digi, &new_digi, sizeof(new_digi)); |
0b99d589 | 2169 | |
8b07d521 | 2170 | if (ch->ch_digi.digi_maxcps < 1) |
0b99d589 LL |
2171 | ch->ch_digi.digi_maxcps = 1; |
2172 | ||
8b07d521 | 2173 | if (ch->ch_digi.digi_maxcps > 10000) |
0b99d589 LL |
2174 | ch->ch_digi.digi_maxcps = 10000; |
2175 | ||
2176 | if (ch->ch_digi.digi_bufsize < 10) | |
2177 | ch->ch_digi.digi_bufsize = 10; | |
2178 | ||
2179 | if (ch->ch_digi.digi_maxchar < 1) | |
2180 | ch->ch_digi.digi_maxchar = 1; | |
2181 | ||
2182 | if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize) | |
2183 | ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize; | |
2184 | ||
2185 | if (ch->ch_digi.digi_onlen > DIGI_PLEN) | |
2186 | ch->ch_digi.digi_onlen = DIGI_PLEN; | |
2187 | ||
2188 | if (ch->ch_digi.digi_offlen > DIGI_PLEN) | |
2189 | ch->ch_digi.digi_offlen = DIGI_PLEN; | |
2190 | ||
2191 | ch->ch_bd->bd_ops->param(tty); | |
2192 | ||
a44b508a | 2193 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2194 | |
8f90ef80 | 2195 | return 0; |
0b99d589 LL |
2196 | } |
2197 | ||
0b99d589 LL |
2198 | /* |
2199 | * dgnc_set_termios() | |
2200 | */ | |
851f306d CM |
2201 | static void dgnc_tty_set_termios(struct tty_struct *tty, |
2202 | struct ktermios *old_termios) | |
0b99d589 | 2203 | { |
03425f55 | 2204 | struct dgnc_board *bd; |
0b99d589 LL |
2205 | struct channel_t *ch; |
2206 | struct un_t *un; | |
a44b508a | 2207 | unsigned long flags; |
0b99d589 LL |
2208 | |
2209 | if (!tty || tty->magic != TTY_MAGIC) | |
2210 | return; | |
2211 | ||
2212 | un = tty->driver_data; | |
2213 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2214 | return; | |
2215 | ||
2216 | ch = un->un_ch; | |
2217 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2218 | return; | |
2219 | ||
2220 | bd = ch->ch_bd; | |
2221 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2222 | return; | |
2223 | ||
a44b508a | 2224 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2225 | |
22e3de76 LL |
2226 | ch->ch_c_cflag = tty->termios.c_cflag; |
2227 | ch->ch_c_iflag = tty->termios.c_iflag; | |
2228 | ch->ch_c_oflag = tty->termios.c_oflag; | |
2229 | ch->ch_c_lflag = tty->termios.c_lflag; | |
2230 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
2231 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
2232 | |
2233 | ch->ch_bd->bd_ops->param(tty); | |
2234 | dgnc_carrier(ch); | |
2235 | ||
a44b508a | 2236 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2237 | } |
2238 | ||
0b99d589 LL |
2239 | static void dgnc_tty_throttle(struct tty_struct *tty) |
2240 | { | |
2241 | struct channel_t *ch; | |
2242 | struct un_t *un; | |
a44b508a | 2243 | unsigned long flags; |
0b99d589 LL |
2244 | |
2245 | if (!tty || tty->magic != TTY_MAGIC) | |
2246 | return; | |
2247 | ||
2248 | un = tty->driver_data; | |
2249 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2250 | return; | |
8b07d521 | 2251 | |
90d2a471 LL |
2252 | ch = un->un_ch; |
2253 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2254 | return; | |
0b99d589 | 2255 | |
a44b508a | 2256 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2257 | |
2258 | ch->ch_flags |= (CH_FORCED_STOPI); | |
2259 | ||
a44b508a | 2260 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2261 | } |
2262 | ||
0b99d589 LL |
2263 | static void dgnc_tty_unthrottle(struct tty_struct *tty) |
2264 | { | |
2265 | struct channel_t *ch; | |
2266 | struct un_t *un; | |
a44b508a | 2267 | unsigned long flags; |
0b99d589 LL |
2268 | |
2269 | if (!tty || tty->magic != TTY_MAGIC) | |
2270 | return; | |
2271 | ||
2272 | un = tty->driver_data; | |
2273 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2274 | return; | |
8b07d521 | 2275 | |
90d2a471 LL |
2276 | ch = un->un_ch; |
2277 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2278 | return; | |
0b99d589 | 2279 | |
a44b508a | 2280 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2281 | |
2282 | ch->ch_flags &= ~(CH_FORCED_STOPI); | |
2283 | ||
a44b508a | 2284 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2285 | } |
2286 | ||
0b99d589 LL |
2287 | static void dgnc_tty_start(struct tty_struct *tty) |
2288 | { | |
03425f55 | 2289 | struct dgnc_board *bd; |
0b99d589 LL |
2290 | struct channel_t *ch; |
2291 | struct un_t *un; | |
a44b508a | 2292 | unsigned long flags; |
0b99d589 LL |
2293 | |
2294 | if (!tty || tty->magic != TTY_MAGIC) | |
2295 | return; | |
2296 | ||
2297 | un = tty->driver_data; | |
2298 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2299 | return; | |
8b07d521 | 2300 | |
90d2a471 LL |
2301 | ch = un->un_ch; |
2302 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2303 | return; | |
0b99d589 LL |
2304 | |
2305 | bd = ch->ch_bd; | |
2306 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2307 | return; | |
2308 | ||
a44b508a | 2309 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2310 | |
2311 | ch->ch_flags &= ~(CH_FORCED_STOP); | |
2312 | ||
a44b508a | 2313 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2314 | } |
2315 | ||
0b99d589 LL |
2316 | static void dgnc_tty_stop(struct tty_struct *tty) |
2317 | { | |
03425f55 | 2318 | struct dgnc_board *bd; |
0b99d589 LL |
2319 | struct channel_t *ch; |
2320 | struct un_t *un; | |
a44b508a | 2321 | unsigned long flags; |
0b99d589 LL |
2322 | |
2323 | if (!tty || tty->magic != TTY_MAGIC) | |
2324 | return; | |
2325 | ||
2326 | un = tty->driver_data; | |
2327 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2328 | return; | |
8b07d521 | 2329 | |
90d2a471 LL |
2330 | ch = un->un_ch; |
2331 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2332 | return; | |
0b99d589 LL |
2333 | |
2334 | bd = ch->ch_bd; | |
2335 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2336 | return; | |
2337 | ||
a44b508a | 2338 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2339 | |
2340 | ch->ch_flags |= (CH_FORCED_STOP); | |
2341 | ||
a44b508a | 2342 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2343 | } |
2344 | ||
8b07d521 | 2345 | /* |
0b99d589 LL |
2346 | * dgnc_tty_flush_chars() |
2347 | * | |
2348 | * Flush the cook buffer | |
2349 | * | |
2350 | * Note to self, and any other poor souls who venture here: | |
2351 | * | |
2352 | * flush in this case DOES NOT mean dispose of the data. | |
2353 | * instead, it means "stop buffering and send it if you | |
2354 | * haven't already." Just guess how I figured that out... SRW 2-Jun-98 | |
2355 | * | |
2356 | * It is also always called in interrupt context - JAR 8-Sept-99 | |
2357 | */ | |
2358 | static void dgnc_tty_flush_chars(struct tty_struct *tty) | |
2359 | { | |
03425f55 | 2360 | struct dgnc_board *bd; |
0b99d589 LL |
2361 | struct channel_t *ch; |
2362 | struct un_t *un; | |
a44b508a | 2363 | unsigned long flags; |
0b99d589 LL |
2364 | |
2365 | if (!tty || tty->magic != TTY_MAGIC) | |
2366 | return; | |
2367 | ||
2368 | un = tty->driver_data; | |
2369 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2370 | return; | |
8b07d521 | 2371 | |
90d2a471 LL |
2372 | ch = un->un_ch; |
2373 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2374 | return; | |
0b99d589 LL |
2375 | |
2376 | bd = ch->ch_bd; | |
2377 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2378 | return; | |
2379 | ||
a44b508a | 2380 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2381 | |
2382 | /* Do something maybe here */ | |
2383 | ||
a44b508a | 2384 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2385 | } |
2386 | ||
0b99d589 LL |
2387 | /* |
2388 | * dgnc_tty_flush_buffer() | |
8b07d521 | 2389 | * |
0b99d589 LL |
2390 | * Flush Tx buffer (make in == out) |
2391 | */ | |
2392 | static void dgnc_tty_flush_buffer(struct tty_struct *tty) | |
2393 | { | |
2394 | struct channel_t *ch; | |
2395 | struct un_t *un; | |
a44b508a | 2396 | unsigned long flags; |
0b99d589 LL |
2397 | |
2398 | if (!tty || tty->magic != TTY_MAGIC) | |
2399 | return; | |
2400 | ||
2401 | un = tty->driver_data; | |
2402 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2403 | return; | |
8b07d521 | 2404 | |
90d2a471 LL |
2405 | ch = un->un_ch; |
2406 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2407 | return; | |
0b99d589 | 2408 | |
a44b508a | 2409 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2410 | |
2411 | ch->ch_flags &= ~CH_STOP; | |
2412 | ||
2413 | /* Flush our write queue */ | |
2414 | ch->ch_w_head = ch->ch_w_tail; | |
2415 | ||
2416 | /* Flush UARTs transmit FIFO */ | |
2417 | ch->ch_bd->bd_ops->flush_uart_write(ch); | |
2418 | ||
adcb56f9 RS |
2419 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
2420 | ch->ch_tun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2421 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2422 | } | |
adcb56f9 RS |
2423 | if (ch->ch_pun.un_flags & (UN_LOW | UN_EMPTY)) { |
2424 | ch->ch_pun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2425 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2426 | } | |
2427 | ||
a44b508a | 2428 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2429 | } |
2430 | ||
0b99d589 LL |
2431 | /***************************************************************************** |
2432 | * | |
2433 | * The IOCTL function and all of its helpers | |
2434 | * | |
2435 | *****************************************************************************/ | |
8b07d521 | 2436 | |
0b99d589 LL |
2437 | /* |
2438 | * dgnc_tty_ioctl() | |
2439 | * | |
2440 | * The usual assortment of ioctl's | |
2441 | */ | |
a31cefa2 | 2442 | static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
e352d3f1 | 2443 | unsigned long arg) |
0b99d589 | 2444 | { |
03425f55 | 2445 | struct dgnc_board *bd; |
8670a56f | 2446 | struct board_ops *ch_bd_ops; |
0b99d589 LL |
2447 | struct channel_t *ch; |
2448 | struct un_t *un; | |
2449 | int rc; | |
a44b508a | 2450 | unsigned long flags; |
6f418259 | 2451 | void __user *uarg = (void __user *)arg; |
0b99d589 LL |
2452 | |
2453 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2454 | return -ENODEV; |
0b99d589 LL |
2455 | |
2456 | un = tty->driver_data; | |
2457 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2458 | return -ENODEV; |
0b99d589 LL |
2459 | |
2460 | ch = un->un_ch; | |
2461 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2462 | return -ENODEV; |
0b99d589 LL |
2463 | |
2464 | bd = ch->ch_bd; | |
2465 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2466 | return -ENODEV; |
0b99d589 | 2467 | |
8670a56f DY |
2468 | ch_bd_ops = bd->bd_ops; |
2469 | ||
a44b508a | 2470 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2471 | |
2472 | if (un->un_open_count <= 0) { | |
a44b508a | 2473 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2474 | return -EIO; |
0b99d589 LL |
2475 | } |
2476 | ||
2477 | switch (cmd) { | |
0b99d589 LL |
2478 | /* Here are all the standard ioctl's that we MUST implement */ |
2479 | ||
2480 | case TCSBRK: | |
2481 | /* | |
8b07d521 | 2482 | * TCSBRK is SVID version: non-zero arg --> no break |
0b99d589 LL |
2483 | * this behaviour is exploited by tcdrain(). |
2484 | * | |
2485 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be | |
2486 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2487 | * in the middle: 0.375 seconds. | |
2488 | */ | |
2489 | rc = tty_check_change(tty); | |
a44b508a | 2490 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2491 | if (rc) |
8f90ef80 | 2492 | return rc; |
0b99d589 | 2493 | |
8670a56f | 2494 | rc = ch_bd_ops->drain(tty, 0); |
0b99d589 | 2495 | |
f1e51745 | 2496 | if (rc) |
8f90ef80 | 2497 | return -EINTR; |
0b99d589 | 2498 | |
a44b508a | 2499 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2500 | |
3c4019d3 | 2501 | if (((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP)) |
8670a56f | 2502 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2503 | |
a44b508a | 2504 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2505 | |
8f90ef80 | 2506 | return 0; |
0b99d589 | 2507 | |
0b99d589 | 2508 | case TCSBRKP: |
90d2a471 | 2509 | /* support for POSIX tcsendbreak() |
0b99d589 LL |
2510 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be |
2511 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2512 | * in the middle: 0.375 seconds. | |
2513 | */ | |
2514 | rc = tty_check_change(tty); | |
a44b508a | 2515 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2516 | if (rc) |
8f90ef80 | 2517 | return rc; |
0b99d589 | 2518 | |
8670a56f | 2519 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2520 | if (rc) |
8f90ef80 | 2521 | return -EINTR; |
0b99d589 | 2522 | |
a44b508a | 2523 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2524 | |
8670a56f | 2525 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2526 | |
a44b508a | 2527 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2528 | |
8f90ef80 | 2529 | return 0; |
0b99d589 LL |
2530 | |
2531 | case TIOCSBRK: | |
2532 | rc = tty_check_change(tty); | |
a44b508a | 2533 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2534 | if (rc) |
8f90ef80 | 2535 | return rc; |
0b99d589 | 2536 | |
8670a56f | 2537 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2538 | if (rc) |
8f90ef80 | 2539 | return -EINTR; |
0b99d589 | 2540 | |
a44b508a | 2541 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2542 | |
8670a56f | 2543 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2544 | |
a44b508a | 2545 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2546 | |
8f90ef80 | 2547 | return 0; |
0b99d589 LL |
2548 | |
2549 | case TIOCCBRK: | |
2550 | /* Do Nothing */ | |
a44b508a | 2551 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2552 | return 0; |
2553 | ||
2554 | case TIOCGSOFTCAR: | |
2555 | ||
a44b508a | 2556 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2557 | |
106d43f1 RS |
2558 | return put_user(C_CLOCAL(tty) ? 1 : 0, |
2559 | (unsigned long __user *)arg); | |
0b99d589 LL |
2560 | |
2561 | case TIOCSSOFTCAR: | |
2562 | ||
a44b508a | 2563 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2564 | rc = get_user(arg, (unsigned long __user *)arg); |
0b99d589 | 2565 | if (rc) |
8f90ef80 | 2566 | return rc; |
0b99d589 | 2567 | |
a44b508a | 2568 | spin_lock_irqsave(&ch->ch_lock, flags); |
851f306d CM |
2569 | tty->termios.c_cflag = ((tty->termios.c_cflag & ~CLOCAL) | |
2570 | (arg ? CLOCAL : 0)); | |
8670a56f | 2571 | ch_bd_ops->param(tty); |
a44b508a | 2572 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2573 | |
8f90ef80 | 2574 | return 0; |
8b07d521 | 2575 | |
0b99d589 | 2576 | case TIOCMGET: |
a44b508a | 2577 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2578 | return dgnc_get_modem_info(ch, uarg); |
0b99d589 LL |
2579 | |
2580 | case TIOCMBIS: | |
2581 | case TIOCMBIC: | |
2582 | case TIOCMSET: | |
a44b508a | 2583 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
c23b48e0 | 2584 | return dgnc_set_modem_info(ch, cmd, uarg); |
0b99d589 LL |
2585 | |
2586 | /* | |
2587 | * Here are any additional ioctl's that we want to implement | |
2588 | */ | |
8b07d521 LL |
2589 | |
2590 | case TCFLSH: | |
0b99d589 LL |
2591 | /* |
2592 | * The linux tty driver doesn't have a flush | |
2593 | * input routine for the driver, assuming all backed | |
2594 | * up data is in the line disc. buffers. However, | |
2595 | * we all know that's not the case. Here, we | |
2596 | * act on the ioctl, but then lie and say we didn't | |
2597 | * so the line discipline will process the flush | |
2598 | * also. | |
8b07d521 | 2599 | */ |
0b99d589 LL |
2600 | rc = tty_check_change(tty); |
2601 | if (rc) { | |
a44b508a | 2602 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2603 | return rc; |
0b99d589 LL |
2604 | } |
2605 | ||
2606 | if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) { | |
2607 | ch->ch_r_head = ch->ch_r_tail; | |
8670a56f | 2608 | ch_bd_ops->flush_uart_read(ch); |
0b99d589 LL |
2609 | /* Force queue flow control to be released, if needed */ |
2610 | dgnc_check_queue_flow_control(ch); | |
2611 | } | |
2612 | ||
2613 | if ((arg == TCOFLUSH) || (arg == TCIOFLUSH)) { | |
2614 | if (!(un->un_type == DGNC_PRINT)) { | |
2615 | ch->ch_w_head = ch->ch_w_tail; | |
8670a56f | 2616 | ch_bd_ops->flush_uart_write(ch); |
0b99d589 | 2617 | |
24039c58 | 2618 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
851f306d | 2619 | ch->ch_tun.un_flags &= |
adcb56f9 | 2620 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2621 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2622 | } | |
2623 | ||
2624 | if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) { | |
851f306d | 2625 | ch->ch_pun.un_flags &= |
adcb56f9 | 2626 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2627 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2628 | } | |
0b99d589 LL |
2629 | } |
2630 | } | |
2631 | ||
8b07d521 | 2632 | /* pretend we didn't recognize this IOCTL */ |
a44b508a | 2633 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2634 | return -ENOIOCTLCMD; |
0b99d589 LL |
2635 | case TCSETSF: |
2636 | case TCSETSW: | |
2637 | /* | |
2638 | * The linux tty driver doesn't have a flush | |
2639 | * input routine for the driver, assuming all backed | |
2640 | * up data is in the line disc. buffers. However, | |
2641 | * we all know that's not the case. Here, we | |
2642 | * act on the ioctl, but then lie and say we didn't | |
2643 | * so the line discipline will process the flush | |
2644 | * also. | |
2645 | */ | |
2646 | if (cmd == TCSETSF) { | |
2647 | /* flush rx */ | |
2648 | ch->ch_flags &= ~CH_STOP; | |
2649 | ch->ch_r_head = ch->ch_r_tail; | |
8670a56f | 2650 | ch_bd_ops->flush_uart_read(ch); |
0b99d589 LL |
2651 | /* Force queue flow control to be released, if needed */ |
2652 | dgnc_check_queue_flow_control(ch); | |
2653 | } | |
2654 | ||
2655 | /* now wait for all the output to drain */ | |
a44b508a | 2656 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2657 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2658 | if (rc) |
8f90ef80 | 2659 | return -EINTR; |
0b99d589 LL |
2660 | |
2661 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2662 | return -ENOIOCTLCMD; |
0b99d589 LL |
2663 | |
2664 | case TCSETAW: | |
2665 | ||
a44b508a | 2666 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2667 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2668 | if (rc) |
8f90ef80 | 2669 | return -EINTR; |
0b99d589 LL |
2670 | |
2671 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2672 | return -ENOIOCTLCMD; |
0b99d589 LL |
2673 | |
2674 | case TCXONC: | |
a44b508a | 2675 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2676 | /* Make the ld do it */ |
8f90ef80 | 2677 | return -ENOIOCTLCMD; |
0b99d589 LL |
2678 | |
2679 | case DIGI_GETA: | |
2680 | /* get information for ditty */ | |
a44b508a | 2681 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2682 | return dgnc_tty_digigeta(tty, uarg); |
0b99d589 LL |
2683 | |
2684 | case DIGI_SETAW: | |
2685 | case DIGI_SETAF: | |
2686 | ||
2687 | /* set information for ditty */ | |
2688 | if (cmd == (DIGI_SETAW)) { | |
a44b508a | 2689 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2690 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 SL |
2691 | |
2692 | if (rc) | |
8f90ef80 | 2693 | return -EINTR; |
f1e51745 | 2694 | |
a44b508a | 2695 | spin_lock_irqsave(&ch->ch_lock, flags); |
2000c581 | 2696 | } else { |
0b99d589 LL |
2697 | tty_ldisc_flush(tty); |
2698 | } | |
2699 | /* fall thru */ | |
2700 | ||
2701 | case DIGI_SETA: | |
a44b508a | 2702 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2703 | return dgnc_tty_digiseta(tty, uarg); |
8b07d521 | 2704 | |
0b99d589 LL |
2705 | case DIGI_LOOPBACK: |
2706 | { | |
2707 | uint loopback = 0; | |
851f306d CM |
2708 | /* Let go of locks when accessing user space, |
2709 | * could sleep | |
2710 | */ | |
a44b508a | 2711 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2712 | rc = get_user(loopback, (unsigned int __user *)arg); |
0b99d589 | 2713 | if (rc) |
8f90ef80 | 2714 | return rc; |
a44b508a | 2715 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2716 | |
8b07d521 | 2717 | /* Enable/disable internal loopback for this port */ |
0b99d589 LL |
2718 | if (loopback) |
2719 | ch->ch_flags |= CH_LOOPBACK; | |
2720 | else | |
2721 | ch->ch_flags &= ~(CH_LOOPBACK); | |
2722 | ||
8670a56f | 2723 | ch_bd_ops->param(tty); |
a44b508a | 2724 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2725 | return 0; |
90d2a471 | 2726 | } |
0b99d589 LL |
2727 | |
2728 | case DIGI_GETCUSTOMBAUD: | |
a44b508a | 2729 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
106d43f1 RS |
2730 | return put_user(ch->ch_custom_speed, |
2731 | (unsigned int __user *)arg); | |
0b99d589 LL |
2732 | |
2733 | case DIGI_SETCUSTOMBAUD: | |
2734 | { | |
93c76c9c | 2735 | int new_rate; |
0b99d589 | 2736 | /* Let go of locks when accessing user space, could sleep */ |
a44b508a | 2737 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2738 | rc = get_user(new_rate, (int __user *)arg); |
0b99d589 | 2739 | if (rc) |
8f90ef80 | 2740 | return rc; |
a44b508a | 2741 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2742 | dgnc_set_custom_speed(ch, new_rate); |
8670a56f | 2743 | ch_bd_ops->param(tty); |
a44b508a | 2744 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2745 | return 0; |
90d2a471 | 2746 | } |
0b99d589 LL |
2747 | |
2748 | /* | |
2749 | * This ioctl allows insertion of a character into the front | |
2750 | * of any pending data to be transmitted. | |
2751 | * | |
2752 | * This ioctl is to satify the "Send Character Immediate" | |
2753 | * call that the RealPort protocol spec requires. | |
2754 | */ | |
2755 | case DIGI_REALPORT_SENDIMMEDIATE: | |
2756 | { | |
2757 | unsigned char c; | |
0eaa02e6 | 2758 | |
a44b508a | 2759 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2760 | rc = get_user(c, (unsigned char __user *)arg); |
0b99d589 | 2761 | if (rc) |
8f90ef80 | 2762 | return rc; |
a44b508a | 2763 | spin_lock_irqsave(&ch->ch_lock, flags); |
8670a56f | 2764 | ch_bd_ops->send_immediate_char(ch, c); |
a44b508a | 2765 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2766 | return 0; |
0b99d589 LL |
2767 | } |
2768 | ||
2769 | /* | |
2770 | * This ioctl returns all the current counts for the port. | |
2771 | * | |
2772 | * This ioctl is to satify the "Line Error Counters" | |
2773 | * call that the RealPort protocol spec requires. | |
2774 | */ | |
2775 | case DIGI_REALPORT_GETCOUNTERS: | |
2776 | { | |
2777 | struct digi_getcounter buf; | |
2778 | ||
2779 | buf.norun = ch->ch_err_overrun; | |
feba47a7 | 2780 | buf.noflow = 0; /* The driver doesn't keep this stat */ |
0b99d589 LL |
2781 | buf.nframe = ch->ch_err_frame; |
2782 | buf.nparity = ch->ch_err_parity; | |
2783 | buf.nbreak = ch->ch_err_break; | |
2784 | buf.rbytes = ch->ch_rxcount; | |
2785 | buf.tbytes = ch->ch_txcount; | |
2786 | ||
a44b508a | 2787 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2788 | |
50667c67 | 2789 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2790 | return -EFAULT; |
50667c67 | 2791 | |
8f90ef80 | 2792 | return 0; |
0b99d589 LL |
2793 | } |
2794 | ||
2795 | /* | |
2796 | * This ioctl returns all current events. | |
2797 | * | |
2798 | * This ioctl is to satify the "Event Reporting" | |
2799 | * call that the RealPort protocol spec requires. | |
90d2a471 | 2800 | */ |
0b99d589 LL |
2801 | case DIGI_REALPORT_GETEVENTS: |
2802 | { | |
2803 | unsigned int events = 0; | |
2804 | ||
2805 | /* NOTE: MORE EVENTS NEEDS TO BE ADDED HERE */ | |
2806 | if (ch->ch_flags & CH_BREAK_SENDING) | |
2807 | events |= EV_TXB; | |
851f306d CM |
2808 | if ((ch->ch_flags & CH_STOP) || |
2809 | (ch->ch_flags & CH_FORCED_STOP)) | |
0b99d589 | 2810 | events |= (EV_OPU | EV_OPS); |
50667c67 | 2811 | |
851f306d CM |
2812 | if ((ch->ch_flags & CH_STOPI) || |
2813 | (ch->ch_flags & CH_FORCED_STOPI)) | |
0b99d589 | 2814 | events |= (EV_IPU | EV_IPS); |
0b99d589 | 2815 | |
a44b508a | 2816 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
106d43f1 | 2817 | return put_user(events, (unsigned int __user *)arg); |
0b99d589 LL |
2818 | } |
2819 | ||
2820 | /* | |
2821 | * This ioctl returns TOUT and TIN counters based | |
2822 | * upon the values passed in by the RealPort Server. | |
2823 | * It also passes back whether the UART Transmitter is | |
2824 | * empty as well. | |
90d2a471 | 2825 | */ |
0b99d589 LL |
2826 | case DIGI_REALPORT_GETBUFFERS: |
2827 | { | |
2828 | struct digi_getbuffer buf; | |
2829 | int tdist; | |
2830 | int count; | |
2831 | ||
a44b508a | 2832 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2833 | |
2834 | /* | |
2835 | * Get data from user first. | |
2836 | */ | |
50667c67 | 2837 | if (copy_from_user(&buf, uarg, sizeof(buf))) |
8f90ef80 | 2838 | return -EFAULT; |
0b99d589 | 2839 | |
a44b508a | 2840 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2841 | |
2842 | /* | |
2843 | * Figure out how much data is in our RX and TX queues. | |
2844 | */ | |
2845 | buf.rxbuf = (ch->ch_r_head - ch->ch_r_tail) & RQUEUEMASK; | |
2846 | buf.txbuf = (ch->ch_w_head - ch->ch_w_tail) & WQUEUEMASK; | |
2847 | ||
2848 | /* | |
2849 | * Is the UART empty? Add that value to whats in our TX queue. | |
2850 | */ | |
8670a56f | 2851 | count = buf.txbuf + ch_bd_ops->get_uart_bytes_left(ch); |
0b99d589 LL |
2852 | |
2853 | /* | |
2854 | * Figure out how much data the RealPort Server believes should | |
2855 | * be in our TX queue. | |
2856 | */ | |
b9f84637 | 2857 | tdist = (buf.tx_in - buf.tx_out) & 0xffff; |
0b99d589 LL |
2858 | |
2859 | /* | |
2860 | * If we have more data than the RealPort Server believes we | |
2861 | * should have, reduce our count to its amount. | |
2862 | * | |
2863 | * This count difference CAN happen because the Linux LD can | |
2864 | * insert more characters into our queue for OPOST processing | |
2865 | * that the RealPort Server doesn't know about. | |
2866 | */ | |
50667c67 | 2867 | if (buf.txbuf > tdist) |
0b99d589 | 2868 | buf.txbuf = tdist; |
0b99d589 LL |
2869 | |
2870 | /* | |
2871 | * Report whether our queue and UART TX are completely empty. | |
2872 | */ | |
50667c67 | 2873 | if (count) |
0b99d589 | 2874 | buf.txdone = 0; |
50667c67 | 2875 | else |
0b99d589 | 2876 | buf.txdone = 1; |
0b99d589 | 2877 | |
a44b508a | 2878 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2879 | |
50667c67 | 2880 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2881 | return -EFAULT; |
50667c67 | 2882 | |
8f90ef80 | 2883 | return 0; |
0b99d589 LL |
2884 | } |
2885 | default: | |
a44b508a | 2886 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2887 | |
8f90ef80 | 2888 | return -ENOIOCTLCMD; |
0b99d589 | 2889 | } |
0b99d589 | 2890 | } |