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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 | * Default transparent print information. | |
47 | */ | |
d44e0e5d | 48 | static const struct digi_t dgnc_digi_init = { |
0b99d589 LL |
49 | .digi_flags = DIGI_COOK, /* Flags */ |
50 | .digi_maxcps = 100, /* Max CPS */ | |
51 | .digi_maxchar = 50, /* Max chars in print queue */ | |
52 | .digi_bufsize = 100, /* Printer buffer size */ | |
53 | .digi_onlen = 4, /* size of printer on string */ | |
54 | .digi_offlen = 4, /* size of printer off string */ | |
55 | .digi_onstr = "\033[5i", /* ANSI printer on string ] */ | |
56 | .digi_offstr = "\033[4i", /* ANSI printer off string ] */ | |
57 | .digi_term = "ansi" /* default terminal type */ | |
58 | }; | |
59 | ||
0b99d589 LL |
60 | /* |
61 | * Define a local default termios struct. All ports will be created | |
62 | * with this termios initially. | |
63 | * | |
64 | * This defines a raw port at 9600 baud, 8 data bits, no parity, | |
65 | * 1 stop bit. | |
66 | */ | |
10352c2a | 67 | static struct ktermios DgncDefaultTermios = { |
0b99d589 LL |
68 | .c_iflag = (DEFAULT_IFLAGS), /* iflags */ |
69 | .c_oflag = (DEFAULT_OFLAGS), /* oflags */ | |
70 | .c_cflag = (DEFAULT_CFLAGS), /* cflags */ | |
71 | .c_lflag = (DEFAULT_LFLAGS), /* lflags */ | |
72 | .c_cc = INIT_C_CC, | |
73 | .c_line = 0, | |
74 | }; | |
75 | ||
0b99d589 LL |
76 | /* Our function prototypes */ |
77 | static int dgnc_tty_open(struct tty_struct *tty, struct file *file); | |
78 | static void dgnc_tty_close(struct tty_struct *tty, struct file *file); | |
851f306d CM |
79 | static int dgnc_block_til_ready(struct tty_struct *tty, struct file *file, |
80 | struct channel_t *ch); | |
81 | static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, | |
82 | unsigned long arg); | |
83 | static int dgnc_tty_digigeta(struct tty_struct *tty, | |
84 | struct digi_t __user *retinfo); | |
85 | static int dgnc_tty_digiseta(struct tty_struct *tty, | |
86 | struct digi_t __user *new_info); | |
58b905b3 | 87 | static int dgnc_tty_write_room(struct tty_struct *tty); |
0b99d589 | 88 | static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c); |
58b905b3 | 89 | static int dgnc_tty_chars_in_buffer(struct tty_struct *tty); |
0b99d589 LL |
90 | static void dgnc_tty_start(struct tty_struct *tty); |
91 | static void dgnc_tty_stop(struct tty_struct *tty); | |
92 | static void dgnc_tty_throttle(struct tty_struct *tty); | |
93 | static void dgnc_tty_unthrottle(struct tty_struct *tty); | |
94 | static void dgnc_tty_flush_chars(struct tty_struct *tty); | |
95 | static void dgnc_tty_flush_buffer(struct tty_struct *tty); | |
96 | static void dgnc_tty_hangup(struct tty_struct *tty); | |
c23b48e0 | 97 | static int dgnc_set_modem_info(struct channel_t *ch, unsigned int command, |
851f306d CM |
98 | unsigned int __user *value); |
99 | static int dgnc_get_modem_info(struct channel_t *ch, | |
100 | unsigned int __user *value); | |
0b99d589 | 101 | static int dgnc_tty_tiocmget(struct tty_struct *tty); |
851f306d CM |
102 | static int dgnc_tty_tiocmset(struct tty_struct *tty, unsigned int set, |
103 | unsigned int clear); | |
0b99d589 LL |
104 | static int dgnc_tty_send_break(struct tty_struct *tty, int msec); |
105 | static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout); | |
851f306d CM |
106 | static int dgnc_tty_write(struct tty_struct *tty, const unsigned char *buf, |
107 | int count); | |
108 | static void dgnc_tty_set_termios(struct tty_struct *tty, | |
109 | struct ktermios *old_termios); | |
0b99d589 LL |
110 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char ch); |
111 | ||
0b99d589 LL |
112 | static const struct tty_operations dgnc_tty_ops = { |
113 | .open = dgnc_tty_open, | |
114 | .close = dgnc_tty_close, | |
115 | .write = dgnc_tty_write, | |
116 | .write_room = dgnc_tty_write_room, | |
117 | .flush_buffer = dgnc_tty_flush_buffer, | |
118 | .chars_in_buffer = dgnc_tty_chars_in_buffer, | |
119 | .flush_chars = dgnc_tty_flush_chars, | |
120 | .ioctl = dgnc_tty_ioctl, | |
121 | .set_termios = dgnc_tty_set_termios, | |
122 | .stop = dgnc_tty_stop, | |
123 | .start = dgnc_tty_start, | |
124 | .throttle = dgnc_tty_throttle, | |
125 | .unthrottle = dgnc_tty_unthrottle, | |
126 | .hangup = dgnc_tty_hangup, | |
127 | .put_char = dgnc_tty_put_char, | |
128 | .tiocmget = dgnc_tty_tiocmget, | |
129 | .tiocmset = dgnc_tty_tiocmset, | |
130 | .break_ctl = dgnc_tty_send_break, | |
131 | .wait_until_sent = dgnc_tty_wait_until_sent, | |
132 | .send_xchar = dgnc_tty_send_xchar | |
133 | }; | |
134 | ||
135 | /************************************************************************ | |
8b07d521 | 136 | * |
0b99d589 | 137 | * TTY Initialization/Cleanup Functions |
8b07d521 | 138 | * |
0b99d589 | 139 | ************************************************************************/ |
8b07d521 | 140 | |
0b99d589 LL |
141 | /* |
142 | * dgnc_tty_register() | |
143 | * | |
144 | * Init the tty subsystem for this board. | |
145 | */ | |
03425f55 | 146 | int dgnc_tty_register(struct dgnc_board *brd) |
0b99d589 | 147 | { |
60b3109e | 148 | int rc; |
8b07d521 | 149 | |
60b3109e DY |
150 | brd->serial_driver = tty_alloc_driver(brd->maxports, |
151 | TTY_DRIVER_REAL_RAW | | |
152 | TTY_DRIVER_DYNAMIC_DEV | | |
153 | TTY_DRIVER_HARDWARE_BREAK); | |
0b99d589 | 154 | |
60b3109e DY |
155 | if (IS_ERR(brd->serial_driver)) |
156 | return PTR_ERR(brd->serial_driver); | |
0b99d589 | 157 | |
6841b2a0 CM |
158 | snprintf(brd->serial_name, MAXTTYNAMELEN, "tty_dgnc_%d_", |
159 | brd->boardnum); | |
0b99d589 | 160 | |
60b3109e DY |
161 | brd->serial_driver->name = brd->serial_name; |
162 | brd->serial_driver->name_base = 0; | |
163 | brd->serial_driver->major = 0; | |
164 | brd->serial_driver->minor_start = 0; | |
165 | brd->serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
166 | brd->serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
167 | brd->serial_driver->init_termios = DgncDefaultTermios; | |
168 | brd->serial_driver->driver_name = DRVSTR; | |
0b99d589 | 169 | |
0b99d589 LL |
170 | /* |
171 | * Entry points for driver. Called by the kernel from | |
172 | * tty_io.c and n_tty.c. | |
173 | */ | |
60b3109e | 174 | tty_set_operations(brd->serial_driver, &dgnc_tty_ops); |
0b99d589 | 175 | |
1cd7c062 DY |
176 | rc = tty_register_driver(brd->serial_driver); |
177 | if (rc < 0) { | |
178 | dev_dbg(&brd->pdev->dev, | |
179 | "Can't register tty device (%d)\n", rc); | |
180 | goto free_serial_driver; | |
0b99d589 LL |
181 | } |
182 | ||
183 | /* | |
184 | * If we're doing transparent print, we have to do all of the above | |
79e30af2 | 185 | * again, separately so we don't get the LD confused about what major |
0b99d589 LL |
186 | * we are when we get into the dgnc_tty_open() routine. |
187 | */ | |
60b3109e DY |
188 | brd->print_driver = tty_alloc_driver(brd->maxports, |
189 | TTY_DRIVER_REAL_RAW | | |
190 | TTY_DRIVER_DYNAMIC_DEV | | |
191 | TTY_DRIVER_HARDWARE_BREAK); | |
0b99d589 | 192 | |
a0ca97b8 DY |
193 | if (IS_ERR(brd->print_driver)) { |
194 | rc = PTR_ERR(brd->print_driver); | |
195 | goto unregister_serial_driver; | |
196 | } | |
0b99d589 | 197 | |
60b3109e | 198 | snprintf(brd->print_name, MAXTTYNAMELEN, "pr_dgnc_%d_", brd->boardnum); |
0b99d589 | 199 | |
60b3109e DY |
200 | brd->print_driver->name = brd->print_name; |
201 | brd->print_driver->name_base = 0; | |
202 | brd->print_driver->major = brd->serial_driver->major; | |
203 | brd->print_driver->minor_start = 0x80; | |
204 | brd->print_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
205 | brd->print_driver->subtype = SERIAL_TYPE_NORMAL; | |
206 | brd->print_driver->init_termios = DgncDefaultTermios; | |
207 | brd->print_driver->driver_name = DRVSTR; | |
0b99d589 | 208 | |
0b99d589 LL |
209 | /* |
210 | * Entry points for driver. Called by the kernel from | |
211 | * tty_io.c and n_tty.c. | |
212 | */ | |
60b3109e | 213 | tty_set_operations(brd->print_driver, &dgnc_tty_ops); |
0b99d589 | 214 | |
1cd7c062 DY |
215 | rc = tty_register_driver(brd->print_driver); |
216 | if (rc < 0) { | |
217 | dev_dbg(&brd->pdev->dev, | |
218 | "Can't register Transparent Print device(%d)\n", | |
219 | rc); | |
220 | goto free_print_driver; | |
0b99d589 LL |
221 | } |
222 | ||
60b3109e DY |
223 | return 0; |
224 | ||
225 | free_print_driver: | |
226 | put_tty_driver(brd->print_driver); | |
227 | unregister_serial_driver: | |
228 | tty_unregister_driver(brd->serial_driver); | |
229 | free_serial_driver: | |
230 | put_tty_driver(brd->serial_driver); | |
0b99d589 | 231 | |
8f90ef80 | 232 | return rc; |
0b99d589 LL |
233 | } |
234 | ||
eea5fd11 DY |
235 | void dgnc_tty_unregister(struct dgnc_board *brd) |
236 | { | |
237 | tty_unregister_driver(brd->print_driver); | |
238 | tty_unregister_driver(brd->serial_driver); | |
239 | put_tty_driver(brd->print_driver); | |
240 | put_tty_driver(brd->serial_driver); | |
241 | } | |
242 | ||
0b99d589 LL |
243 | /* |
244 | * dgnc_tty_init() | |
245 | * | |
246 | * Init the tty subsystem. Called once per board after board has been | |
247 | * downloaded and init'ed. | |
248 | */ | |
03425f55 | 249 | int dgnc_tty_init(struct dgnc_board *brd) |
0b99d589 LL |
250 | { |
251 | int i; | |
a7a75386 | 252 | void __iomem *vaddr; |
0b99d589 LL |
253 | struct channel_t *ch; |
254 | ||
255 | if (!brd) | |
8f90ef80 | 256 | return -ENXIO; |
0b99d589 | 257 | |
0b99d589 LL |
258 | /* |
259 | * Initialize board structure elements. | |
260 | */ | |
261 | ||
262 | vaddr = brd->re_map_membase; | |
263 | ||
264 | brd->nasync = brd->maxports; | |
265 | ||
0b99d589 | 266 | for (i = 0; i < brd->nasync; i++) { |
fa52d96c GS |
267 | /* |
268 | * Okay to malloc with GFP_KERNEL, we are not at | |
269 | * interrupt context, and there are no locks held. | |
270 | */ | |
271 | brd->channels[i] = kzalloc(sizeof(*brd->channels[i]), | |
272 | GFP_KERNEL); | |
273 | if (!brd->channels[i]) | |
274 | goto err_free_channels; | |
0b99d589 LL |
275 | } |
276 | ||
277 | ch = brd->channels[0]; | |
278 | vaddr = brd->re_map_membase; | |
279 | ||
280 | /* Set up channel variables */ | |
281 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
a44b508a | 282 | spin_lock_init(&ch->ch_lock); |
0b99d589 LL |
283 | |
284 | /* Store all our magic numbers */ | |
285 | ch->magic = DGNC_CHANNEL_MAGIC; | |
286 | ch->ch_tun.magic = DGNC_UNIT_MAGIC; | |
287 | ch->ch_tun.un_ch = ch; | |
288 | ch->ch_tun.un_type = DGNC_SERIAL; | |
289 | ch->ch_tun.un_dev = i; | |
290 | ||
291 | ch->ch_pun.magic = DGNC_UNIT_MAGIC; | |
292 | ch->ch_pun.un_ch = ch; | |
293 | ch->ch_pun.un_type = DGNC_PRINT; | |
294 | ch->ch_pun.un_dev = i + 128; | |
295 | ||
296 | if (brd->bd_uart_offset == 0x200) | |
a7a75386 | 297 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 | 298 | else |
a7a75386 | 299 | ch->ch_cls_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 LL |
300 | |
301 | ch->ch_bd = brd; | |
302 | ch->ch_portnum = i; | |
303 | ch->ch_digi = dgnc_digi_init; | |
304 | ||
305 | /* .25 second delay */ | |
306 | ch->ch_close_delay = 250; | |
307 | ||
308 | init_waitqueue_head(&ch->ch_flags_wait); | |
309 | init_waitqueue_head(&ch->ch_tun.un_flags_wait); | |
310 | init_waitqueue_head(&ch->ch_pun.un_flags_wait); | |
0b99d589 LL |
311 | |
312 | { | |
313 | struct device *classp; | |
0eaa02e6 | 314 | |
60b3109e | 315 | classp = tty_register_device(brd->serial_driver, i, |
7df227c4 | 316 | &ch->ch_bd->pdev->dev); |
0b99d589 LL |
317 | ch->ch_tun.un_sysfs = classp; |
318 | dgnc_create_tty_sysfs(&ch->ch_tun, classp); | |
319 | ||
60b3109e | 320 | classp = tty_register_device(brd->print_driver, i, |
7df227c4 | 321 | &ch->ch_bd->pdev->dev); |
0b99d589 LL |
322 | ch->ch_pun.un_sysfs = classp; |
323 | dgnc_create_tty_sysfs(&ch->ch_pun, classp); | |
324 | } | |
0b99d589 LL |
325 | } |
326 | ||
8f90ef80 | 327 | return 0; |
fa52d96c GS |
328 | |
329 | err_free_channels: | |
330 | for (i = i - 1; i >= 0; --i) { | |
331 | kfree(brd->channels[i]); | |
332 | brd->channels[i] = NULL; | |
333 | } | |
334 | return -ENOMEM; | |
0b99d589 LL |
335 | } |
336 | ||
0b99d589 | 337 | /* |
33ccb442 | 338 | * dgnc_cleanup_tty() |
0b99d589 LL |
339 | * |
340 | * Uninitialize the TTY portion of this driver. Free all memory and | |
8b07d521 | 341 | * resources. |
0b99d589 | 342 | */ |
33ccb442 | 343 | void dgnc_cleanup_tty(struct dgnc_board *brd) |
0b99d589 LL |
344 | { |
345 | int i = 0; | |
346 | ||
1cd7c062 DY |
347 | for (i = 0; i < brd->nasync; i++) { |
348 | if (brd->channels[i]) | |
349 | dgnc_remove_tty_sysfs(brd->channels[i]-> | |
350 | ch_tun.un_sysfs); | |
351 | tty_unregister_device(brd->serial_driver, i); | |
0b99d589 | 352 | } |
1cd7c062 | 353 | tty_unregister_driver(brd->serial_driver); |
0b99d589 | 354 | |
1cd7c062 DY |
355 | for (i = 0; i < brd->nasync; i++) { |
356 | if (brd->channels[i]) | |
357 | dgnc_remove_tty_sysfs(brd->channels[i]-> | |
358 | ch_pun.un_sysfs); | |
359 | tty_unregister_device(brd->print_driver, i); | |
0b99d589 | 360 | } |
1cd7c062 | 361 | tty_unregister_driver(brd->print_driver); |
0b99d589 | 362 | |
60b3109e DY |
363 | put_tty_driver(brd->serial_driver); |
364 | put_tty_driver(brd->print_driver); | |
0b99d589 LL |
365 | } |
366 | ||
8e8d27f7 | 367 | /* |
0b99d589 LL |
368 | * dgnc_wmove - Write data to transmit queue. |
369 | * | |
370 | * ch - Pointer to channel structure. | |
f7f2b10a | 371 | * buf - Pointer to characters to be moved. |
0b99d589 | 372 | * n - Number of characters to move. |
8e8d27f7 | 373 | */ |
0b99d589 LL |
374 | static void dgnc_wmove(struct channel_t *ch, char *buf, uint n) |
375 | { | |
376 | int remain; | |
377 | uint head; | |
378 | ||
379 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
380 | return; | |
8b07d521 | 381 | |
0b99d589 LL |
382 | head = ch->ch_w_head & WQUEUEMASK; |
383 | ||
384 | /* | |
385 | * If the write wraps over the top of the circular buffer, | |
386 | * move the portion up to the wrap point, and reset the | |
387 | * pointers to the bottom. | |
388 | */ | |
389 | remain = WQUEUESIZE - head; | |
390 | ||
391 | if (n >= remain) { | |
8b07d521 | 392 | n -= remain; |
0b99d589 LL |
393 | memcpy(ch->ch_wqueue + head, buf, remain); |
394 | head = 0; | |
395 | buf += remain; | |
396 | } | |
397 | ||
398 | if (n > 0) { | |
399 | /* | |
400 | * Move rest of data. | |
401 | */ | |
402 | remain = n; | |
403 | memcpy(ch->ch_wqueue + head, buf, remain); | |
404 | head += remain; | |
405 | } | |
406 | ||
407 | head &= WQUEUEMASK; | |
408 | ch->ch_w_head = head; | |
409 | } | |
410 | ||
8e8d27f7 | 411 | /* |
0b99d589 | 412 | * dgnc_input - Process received data. |
8b07d521 | 413 | * |
90d2a471 | 414 | * ch - Pointer to channel structure. |
8e8d27f7 | 415 | */ |
0b99d589 LL |
416 | void dgnc_input(struct channel_t *ch) |
417 | { | |
03425f55 | 418 | struct dgnc_board *bd; |
0b99d589 | 419 | struct tty_struct *tp; |
c84a083b | 420 | struct tty_ldisc *ld = NULL; |
0b99d589 LL |
421 | uint rmask; |
422 | ushort head; | |
423 | ushort tail; | |
424 | int data_len; | |
a44b508a | 425 | unsigned long flags; |
0b99d589 LL |
426 | int flip_len; |
427 | int len = 0; | |
428 | int n = 0; | |
0b99d589 LL |
429 | int s = 0; |
430 | int i = 0; | |
431 | ||
432 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
433 | return; | |
434 | ||
435 | tp = ch->ch_tun.un_tty; | |
436 | ||
437 | bd = ch->ch_bd; | |
a82477c3 | 438 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
0b99d589 LL |
439 | return; |
440 | ||
a44b508a | 441 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 442 | |
8b07d521 LL |
443 | /* |
444 | * Figure the number of characters in the buffer. | |
0b99d589 LL |
445 | * Exit immediately if none. |
446 | */ | |
447 | rmask = RQUEUEMASK; | |
448 | head = ch->ch_r_head & rmask; | |
449 | tail = ch->ch_r_tail & rmask; | |
450 | data_len = (head - tail) & rmask; | |
451 | ||
c84a083b QL |
452 | if (data_len == 0) |
453 | goto exit_unlock; | |
0b99d589 | 454 | |
0b99d589 LL |
455 | /* |
456 | * If the device is not open, or CREAD is off, | |
90d2a471 | 457 | * flush input data and return immediately. |
0b99d589 | 458 | */ |
851f306d CM |
459 | if (!tp || (tp->magic != TTY_MAGIC) || |
460 | !(ch->ch_tun.un_flags & UN_ISOPEN) || | |
9db276f8 | 461 | !C_CREAD(tp) || |
851f306d | 462 | (ch->ch_tun.un_flags & UN_CLOSING)) { |
0b99d589 LL |
463 | ch->ch_r_head = tail; |
464 | ||
465 | /* Force queue flow control to be released, if needed */ | |
466 | dgnc_check_queue_flow_control(ch); | |
467 | ||
c84a083b | 468 | goto exit_unlock; |
0b99d589 LL |
469 | } |
470 | ||
471 | /* | |
472 | * If we are throttled, simply don't read any data. | |
473 | */ | |
c84a083b QL |
474 | if (ch->ch_flags & CH_FORCED_STOPI) |
475 | goto exit_unlock; | |
0b99d589 | 476 | |
100013fa | 477 | flip_len = TTY_FLIPBUF_SIZE; |
0b99d589 LL |
478 | |
479 | /* Chop down the length, if needed */ | |
480 | len = min(data_len, flip_len); | |
100013fa | 481 | len = min(len, (N_TTY_BUF_SIZE - 1)); |
0b99d589 LL |
482 | |
483 | ld = tty_ldisc_ref(tp); | |
484 | ||
0b99d589 LL |
485 | /* |
486 | * If we were unable to get a reference to the ld, | |
487 | * don't flush our buffer, and act like the ld doesn't | |
488 | * have any space to put the data right now. | |
489 | */ | |
490 | if (!ld) { | |
491 | len = 0; | |
492 | } else { | |
493 | /* | |
494 | * If ld doesn't have a pointer to a receive_buf function, | |
495 | * flush the data, then act like the ld doesn't have any | |
496 | * space to put the data right now. | |
497 | */ | |
498 | if (!ld->ops->receive_buf) { | |
499 | ch->ch_r_head = ch->ch_r_tail; | |
500 | len = 0; | |
8b07d521 | 501 | } |
0b99d589 LL |
502 | } |
503 | ||
c84a083b QL |
504 | if (len <= 0) |
505 | goto exit_unlock; | |
0b99d589 LL |
506 | |
507 | /* | |
508 | * The tty layer in the kernel has changed in 2.6.16+. | |
509 | * | |
510 | * The flip buffers in the tty structure are no longer exposed, | |
511 | * and probably will be going away eventually. | |
8b07d521 | 512 | * |
0b99d589 LL |
513 | * If we are completely raw, we don't need to go through a lot |
514 | * of the tty layers that exist. | |
515 | * In this case, we take the shortest and fastest route we | |
516 | * can to relay the data to the user. | |
517 | * | |
518 | * On the other hand, if we are not raw, we need to go through | |
519 | * the new 2.6.16+ tty layer, which has its API more well defined. | |
520 | */ | |
100013fa LL |
521 | len = tty_buffer_request_room(tp->port, len); |
522 | n = len; | |
0b99d589 | 523 | |
100013fa LL |
524 | /* |
525 | * n now contains the most amount of data we can copy, | |
526 | * bounded either by how much the Linux tty layer can handle, | |
527 | * or the amount of data the card actually has pending... | |
528 | */ | |
529 | while (n) { | |
56d118c2 DY |
530 | unsigned char *ch_pos = ch->ch_equeue + tail; |
531 | ||
100013fa LL |
532 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; |
533 | s = min(s, n); | |
0b99d589 | 534 | |
100013fa LL |
535 | if (s <= 0) |
536 | break; | |
0b99d589 LL |
537 | |
538 | /* | |
8b07d521 | 539 | * If conditions are such that ld needs to see all |
100013fa LL |
540 | * UART errors, we will have to walk each character |
541 | * and error byte and send them to the buffer one at | |
542 | * a time. | |
0b99d589 | 543 | */ |
100013fa LL |
544 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
545 | for (i = 0; i < s; i++) { | |
56d118c2 DY |
546 | unsigned char ch = *(ch_pos + i); |
547 | char flag = TTY_NORMAL; | |
548 | ||
549 | if (ch & UART_LSR_BI) | |
550 | flag = TTY_BREAK; | |
551 | else if (ch & UART_LSR_PE) | |
552 | flag = TTY_PARITY; | |
553 | else if (ch & UART_LSR_FE) | |
554 | flag = TTY_FRAME; | |
555 | ||
556 | tty_insert_flip_char(tp->port, ch, flag); | |
100013fa | 557 | } |
2000c581 | 558 | } else { |
56d118c2 | 559 | tty_insert_flip_string(tp->port, ch_pos, s); |
0b99d589 LL |
560 | } |
561 | ||
100013fa LL |
562 | tail += s; |
563 | n -= s; | |
564 | /* Flip queue if needed */ | |
565 | tail &= rmask; | |
0b99d589 | 566 | } |
0b99d589 | 567 | |
100013fa LL |
568 | ch->ch_r_tail = tail & rmask; |
569 | ch->ch_e_tail = tail & rmask; | |
570 | dgnc_check_queue_flow_control(ch); | |
a44b508a | 571 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 572 | |
100013fa LL |
573 | /* Tell the tty layer its okay to "eat" the data now */ |
574 | tty_flip_buffer_push(tp->port); | |
0b99d589 LL |
575 | |
576 | if (ld) | |
577 | tty_ldisc_deref(ld); | |
c84a083b QL |
578 | return; |
579 | ||
580 | exit_unlock: | |
5ec29365 | 581 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
c84a083b QL |
582 | if (ld) |
583 | tty_ldisc_deref(ld); | |
0b99d589 LL |
584 | } |
585 | ||
8b07d521 | 586 | /************************************************************************ |
0b99d589 | 587 | * Determines when CARRIER changes state and takes appropriate |
8b07d521 | 588 | * action. |
0b99d589 LL |
589 | ************************************************************************/ |
590 | void dgnc_carrier(struct channel_t *ch) | |
591 | { | |
90d2a471 LL |
592 | int virt_carrier = 0; |
593 | int phys_carrier = 0; | |
8b07d521 | 594 | |
0b99d589 LL |
595 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
596 | return; | |
597 | ||
f1e51745 | 598 | if (ch->ch_mistat & UART_MSR_DCD) |
0b99d589 | 599 | phys_carrier = 1; |
0b99d589 | 600 | |
50667c67 | 601 | if (ch->ch_digi.digi_flags & DIGI_FORCEDCD) |
0b99d589 | 602 | virt_carrier = 1; |
0b99d589 | 603 | |
50667c67 | 604 | if (ch->ch_c_cflag & CLOCAL) |
0b99d589 | 605 | virt_carrier = 1; |
0b99d589 | 606 | |
0b99d589 LL |
607 | /* |
608 | * Test for a VIRTUAL carrier transition to HIGH. | |
609 | */ | |
610 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
0b99d589 LL |
611 | /* |
612 | * When carrier rises, wake any threads waiting | |
613 | * for carrier in the open routine. | |
614 | */ | |
615 | ||
7df227c4 | 616 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
617 | wake_up_interruptible(&ch->ch_flags_wait); |
618 | } | |
619 | ||
620 | /* | |
621 | * Test for a PHYSICAL carrier transition to HIGH. | |
622 | */ | |
623 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
0b99d589 LL |
624 | /* |
625 | * When carrier rises, wake any threads waiting | |
626 | * for carrier in the open routine. | |
627 | */ | |
628 | ||
7df227c4 | 629 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
630 | wake_up_interruptible(&ch->ch_flags_wait); |
631 | } | |
632 | ||
633 | /* | |
634 | * Test for a PHYSICAL transition to low, so long as we aren't | |
635 | * currently ignoring physical transitions (which is what "virtual | |
636 | * carrier" indicates). | |
637 | * | |
638 | * The transition of the virtual carrier to low really doesn't | |
639 | * matter... it really only means "ignore carrier state", not | |
640 | * "make pretend that carrier is there". | |
641 | */ | |
642 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) && | |
10352c2a | 643 | (phys_carrier == 0)) { |
0b99d589 LL |
644 | /* |
645 | * When carrier drops: | |
646 | * | |
647 | * Drop carrier on all open units. | |
648 | * | |
649 | * Flush queues, waking up any task waiting in the | |
650 | * line discipline. | |
651 | * | |
652 | * Send a hangup to the control terminal. | |
653 | * | |
654 | * Enable all select calls. | |
655 | */ | |
7df227c4 | 656 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
657 | wake_up_interruptible(&ch->ch_flags_wait); |
658 | ||
f1e51745 | 659 | if (ch->ch_tun.un_open_count > 0) |
0b99d589 | 660 | tty_hangup(ch->ch_tun.un_tty); |
0b99d589 | 661 | |
f1e51745 | 662 | if (ch->ch_pun.un_open_count > 0) |
0b99d589 | 663 | tty_hangup(ch->ch_pun.un_tty); |
0b99d589 LL |
664 | } |
665 | ||
666 | /* | |
667 | * Make sure that our cached values reflect the current reality. | |
668 | */ | |
669 | if (virt_carrier == 1) | |
670 | ch->ch_flags |= CH_FCAR; | |
8b07d521 | 671 | else |
0b99d589 LL |
672 | ch->ch_flags &= ~CH_FCAR; |
673 | ||
674 | if (phys_carrier == 1) | |
675 | ch->ch_flags |= CH_CD; | |
676 | else | |
677 | ch->ch_flags &= ~CH_CD; | |
678 | } | |
679 | ||
680 | /* | |
681 | * Assign the custom baud rate to the channel structure | |
682 | */ | |
683 | static void dgnc_set_custom_speed(struct channel_t *ch, uint newrate) | |
684 | { | |
685 | int testdiv; | |
686 | int testrate_high; | |
8b07d521 | 687 | int testrate_low; |
0b99d589 LL |
688 | int deltahigh; |
689 | int deltalow; | |
690 | ||
93c76c9c DY |
691 | if (newrate <= 0) { |
692 | ch->ch_custom_speed = 0; | |
693 | return; | |
694 | } | |
0b99d589 LL |
695 | |
696 | /* | |
697 | * Since the divisor is stored in a 16-bit integer, we make sure | |
698 | * we don't allow any rates smaller than a 16-bit integer would allow. | |
699 | * And of course, rates above the dividend won't fly. | |
700 | */ | |
701 | if (newrate && newrate < ((ch->ch_bd->bd_dividend / 0xFFFF) + 1)) | |
0b7ceaa6 | 702 | newrate = (ch->ch_bd->bd_dividend / 0xFFFF) + 1; |
0b99d589 LL |
703 | |
704 | if (newrate && newrate > ch->ch_bd->bd_dividend) | |
90d2a471 | 705 | newrate = ch->ch_bd->bd_dividend; |
0b99d589 | 706 | |
93c76c9c | 707 | if (newrate > 0) { |
0b99d589 LL |
708 | testdiv = ch->ch_bd->bd_dividend / newrate; |
709 | ||
710 | /* | |
711 | * If we try to figure out what rate the board would use | |
712 | * with the test divisor, it will be either equal or higher | |
713 | * than the requested baud rate. If we then determine the | |
8b07d521 | 714 | * rate with a divisor one higher, we will get the next lower |
0b99d589 LL |
715 | * supported rate below the requested. |
716 | */ | |
717 | testrate_high = ch->ch_bd->bd_dividend / testdiv; | |
718 | testrate_low = ch->ch_bd->bd_dividend / (testdiv + 1); | |
719 | ||
720 | /* | |
721 | * If the rate for the requested divisor is correct, just | |
722 | * use it and be done. | |
723 | */ | |
93c76c9c DY |
724 | if (testrate_high != newrate) { |
725 | /* | |
851f306d CM |
726 | * Otherwise, pick the rate that is closer |
727 | * (i.e. whichever rate has a smaller delta). | |
93c76c9c DY |
728 | */ |
729 | deltahigh = testrate_high - newrate; | |
730 | deltalow = newrate - testrate_low; | |
0b99d589 | 731 | |
50667c67 | 732 | if (deltahigh < deltalow) |
93c76c9c | 733 | newrate = testrate_high; |
50667c67 | 734 | else |
93c76c9c | 735 | newrate = testrate_low; |
0b99d589 | 736 | } |
0b99d589 | 737 | } |
8b07d521 | 738 | |
0b99d589 | 739 | ch->ch_custom_speed = newrate; |
0b99d589 LL |
740 | } |
741 | ||
0b99d589 LL |
742 | void dgnc_check_queue_flow_control(struct channel_t *ch) |
743 | { | |
d09c1b96 | 744 | int qleft; |
0b99d589 LL |
745 | |
746 | /* Store how much space we have left in the queue */ | |
f7c851d4 CP |
747 | qleft = ch->ch_r_tail - ch->ch_r_head - 1; |
748 | if (qleft < 0) | |
0b99d589 LL |
749 | qleft += RQUEUEMASK + 1; |
750 | ||
751 | /* | |
752 | * Check to see if we should enforce flow control on our queue because | |
753 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
754 | * | |
755 | * NOTE: This is done based on what the current flow control of the | |
756 | * port is set for. | |
757 | * | |
758 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
759 | * This will cause the UART's FIFO to back up, and force | |
760 | * the RTS signal to be dropped. | |
761 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
762 | * the other side, in hopes it will stop sending data to us. | |
763 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
764 | * that gets sent into us when the queue fills up. | |
765 | */ | |
766 | if (qleft < 256) { | |
767 | /* HWFLOW */ | |
851f306d CM |
768 | if (ch->ch_digi.digi_flags & CTSPACE || |
769 | ch->ch_c_cflag & CRTSCTS) { | |
a82477c3 | 770 | if (!(ch->ch_flags & CH_RECEIVER_OFF)) { |
0b99d589 LL |
771 | ch->ch_bd->bd_ops->disable_receiver(ch); |
772 | ch->ch_flags |= (CH_RECEIVER_OFF); | |
0b99d589 LL |
773 | } |
774 | } | |
775 | /* SWFLOW */ | |
776 | else if (ch->ch_c_iflag & IXOFF) { | |
777 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
778 | ch->ch_bd->bd_ops->send_stop_character(ch); | |
779 | ch->ch_stops_sent++; | |
0b99d589 LL |
780 | } |
781 | } | |
0b99d589 LL |
782 | } |
783 | ||
784 | /* | |
785 | * Check to see if we should unenforce flow control because | |
786 | * ld (or user) finally read enuf data out of our queue. | |
787 | * | |
788 | * NOTE: This is done based on what the current flow control of the | |
789 | * port is set for. | |
790 | * | |
791 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
792 | * This will cause the UART's FIFO to raise RTS back up, | |
793 | * which will allow the other side to start sending data again. | |
794 | * 2) SWFLOW (IXOFF) - Send a start character to | |
795 | * the other side, so it will start sending data to us again. | |
796 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
797 | * other side, we don't need to do anything now. | |
798 | */ | |
799 | if (qleft > (RQUEUESIZE / 2)) { | |
800 | /* HWFLOW */ | |
851f306d CM |
801 | if (ch->ch_digi.digi_flags & RTSPACE || |
802 | ch->ch_c_cflag & CRTSCTS) { | |
0b99d589 LL |
803 | if (ch->ch_flags & CH_RECEIVER_OFF) { |
804 | ch->ch_bd->bd_ops->enable_receiver(ch); | |
805 | ch->ch_flags &= ~(CH_RECEIVER_OFF); | |
0b99d589 LL |
806 | } |
807 | } | |
808 | /* SWFLOW */ | |
809 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
810 | ch->ch_stops_sent = 0; | |
811 | ch->ch_bd->bd_ops->send_start_character(ch); | |
0b99d589 | 812 | } |
0b99d589 LL |
813 | } |
814 | } | |
815 | ||
0b99d589 LL |
816 | void dgnc_wakeup_writes(struct channel_t *ch) |
817 | { | |
818 | int qlen = 0; | |
a44b508a | 819 | unsigned long flags; |
0b99d589 LL |
820 | |
821 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
822 | return; | |
823 | ||
a44b508a | 824 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
825 | |
826 | /* | |
827 | * If channel now has space, wake up anyone waiting on the condition. | |
828 | */ | |
f7c851d4 CP |
829 | qlen = ch->ch_w_head - ch->ch_w_tail; |
830 | if (qlen < 0) | |
90d2a471 | 831 | qlen += WQUEUESIZE; |
0b99d589 LL |
832 | |
833 | if (qlen >= (WQUEUESIZE - 256)) { | |
a44b508a | 834 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
835 | return; |
836 | } | |
837 | ||
838 | if (ch->ch_tun.un_flags & UN_ISOPEN) { | |
6aa56785 | 839 | tty_wakeup(ch->ch_tun.un_tty); |
0b99d589 LL |
840 | |
841 | /* | |
842 | * If unit is set to wait until empty, check to make sure | |
843 | * the queue AND FIFO are both empty. | |
844 | */ | |
845 | if (ch->ch_tun.un_flags & UN_EMPTY) { | |
851f306d | 846 | if ((qlen == 0) && |
e352d3f1 | 847 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) { |
0b99d589 LL |
848 | ch->ch_tun.un_flags &= ~(UN_EMPTY); |
849 | ||
850 | /* | |
851 | * If RTS Toggle mode is on, whenever | |
852 | * the queue and UART is empty, keep RTS low. | |
853 | */ | |
854 | if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) { | |
855 | ch->ch_mostat &= ~(UART_MCR_RTS); | |
856 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
857 | } | |
858 | ||
859 | /* | |
860 | * If DTR Toggle mode is on, whenever | |
861 | * the queue and UART is empty, keep DTR low. | |
862 | */ | |
863 | if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) { | |
864 | ch->ch_mostat &= ~(UART_MCR_DTR); | |
865 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
866 | } | |
867 | } | |
868 | } | |
869 | ||
870 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); | |
871 | } | |
872 | ||
873 | if (ch->ch_pun.un_flags & UN_ISOPEN) { | |
6aa56785 | 874 | tty_wakeup(ch->ch_pun.un_tty); |
0b99d589 LL |
875 | |
876 | /* | |
877 | * If unit is set to wait until empty, check to make sure | |
878 | * the queue AND FIFO are both empty. | |
879 | */ | |
880 | if (ch->ch_pun.un_flags & UN_EMPTY) { | |
851f306d CM |
881 | if ((qlen == 0) && |
882 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) | |
0b99d589 | 883 | ch->ch_pun.un_flags &= ~(UN_EMPTY); |
0b99d589 LL |
884 | } |
885 | ||
886 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); | |
887 | } | |
888 | ||
a44b508a | 889 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
890 | } |
891 | ||
2e41eb96 | 892 | static struct dgnc_board *find_board_by_major(unsigned int major) |
9f7a104c DY |
893 | { |
894 | int i; | |
895 | ||
896 | for (i = 0; i < MAXBOARDS; i++) { | |
897 | struct dgnc_board *brd = dgnc_board[i]; | |
898 | ||
899 | if (!brd) | |
900 | return NULL; | |
901 | ||
902 | if (major == brd->serial_driver->major || | |
903 | major == brd->print_driver->major) | |
904 | return brd; | |
905 | } | |
906 | ||
907 | return NULL; | |
908 | } | |
909 | ||
0b99d589 | 910 | /************************************************************************ |
8b07d521 | 911 | * |
0b99d589 | 912 | * TTY Entry points and helper functions |
8b07d521 | 913 | * |
0b99d589 LL |
914 | ************************************************************************/ |
915 | ||
916 | /* | |
917 | * dgnc_tty_open() | |
918 | * | |
919 | */ | |
920 | static int dgnc_tty_open(struct tty_struct *tty, struct file *file) | |
921 | { | |
03425f55 | 922 | struct dgnc_board *brd; |
0b99d589 LL |
923 | struct channel_t *ch; |
924 | struct un_t *un; | |
925 | uint major = 0; | |
926 | uint minor = 0; | |
927 | int rc = 0; | |
a44b508a | 928 | unsigned long flags; |
0b99d589 LL |
929 | |
930 | rc = 0; | |
931 | ||
932 | major = MAJOR(tty_devnum(tty)); | |
933 | minor = MINOR(tty_devnum(tty)); | |
934 | ||
50667c67 | 935 | if (major > 255) |
0b99d589 | 936 | return -ENXIO; |
0b99d589 LL |
937 | |
938 | /* Get board pointer from our array of majors we have allocated */ | |
9f7a104c | 939 | brd = find_board_by_major(major); |
50667c67 | 940 | if (!brd) |
0b99d589 | 941 | return -ENXIO; |
0b99d589 LL |
942 | |
943 | /* | |
944 | * If board is not yet up to a state of READY, go to | |
945 | * sleep waiting for it to happen or they cancel the open. | |
946 | */ | |
947 | rc = wait_event_interruptible(brd->state_wait, | |
e352d3f1 | 948 | (brd->state & BOARD_READY)); |
0b99d589 | 949 | |
50667c67 | 950 | if (rc) |
0b99d589 | 951 | return rc; |
0b99d589 | 952 | |
a44b508a | 953 | spin_lock_irqsave(&brd->bd_lock, flags); |
0b99d589 LL |
954 | |
955 | /* If opened device is greater than our number of ports, bail. */ | |
4bef52f3 | 956 | if (PORT_NUM(minor) >= brd->nasync) { |
a44b508a | 957 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
958 | return -ENXIO; |
959 | } | |
960 | ||
961 | ch = brd->channels[PORT_NUM(minor)]; | |
962 | if (!ch) { | |
a44b508a | 963 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
964 | return -ENXIO; |
965 | } | |
966 | ||
967 | /* Drop board lock */ | |
a44b508a | 968 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
969 | |
970 | /* Grab channel lock */ | |
a44b508a | 971 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
972 | |
973 | /* Figure out our type */ | |
974 | if (!IS_PRINT(minor)) { | |
975 | un = &brd->channels[PORT_NUM(minor)]->ch_tun; | |
976 | un->un_type = DGNC_SERIAL; | |
2000c581 | 977 | } else if (IS_PRINT(minor)) { |
0b99d589 LL |
978 | un = &brd->channels[PORT_NUM(minor)]->ch_pun; |
979 | un->un_type = DGNC_PRINT; | |
2000c581 | 980 | } else { |
a44b508a | 981 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
982 | return -ENXIO; |
983 | } | |
984 | ||
985 | /* | |
986 | * If the port is still in a previous open, and in a state | |
987 | * where we simply cannot safely keep going, wait until the | |
988 | * state clears. | |
989 | */ | |
a44b508a | 990 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 991 | |
851f306d CM |
992 | rc = wait_event_interruptible(ch->ch_flags_wait, |
993 | ((ch->ch_flags & CH_OPENING) == 0)); | |
0b99d589 LL |
994 | |
995 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 996 | if (rc) |
0b99d589 | 997 | return -EINTR; |
0b99d589 LL |
998 | |
999 | /* | |
1000 | * If either unit is in the middle of the fragile part of close, | |
1001 | * we just cannot touch the channel safely. | |
1002 | * Go to sleep, knowing that when the channel can be | |
1003 | * touched safely, the close routine will signal the | |
1004 | * ch_flags_wait to wake us back up. | |
1005 | */ | |
1006 | rc = wait_event_interruptible(ch->ch_flags_wait, | |
851f306d CM |
1007 | (((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & |
1008 | UN_CLOSING) == 0)); | |
0b99d589 LL |
1009 | |
1010 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 1011 | if (rc) |
0b99d589 | 1012 | return -EINTR; |
0b99d589 | 1013 | |
a44b508a | 1014 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1015 | |
0b99d589 LL |
1016 | /* Store our unit into driver_data, so we always have it available. */ |
1017 | tty->driver_data = un; | |
1018 | ||
0b99d589 LL |
1019 | /* |
1020 | * Initialize tty's | |
1021 | */ | |
1022 | if (!(un->un_flags & UN_ISOPEN)) { | |
1023 | /* Store important variables. */ | |
1024 | un->un_tty = tty; | |
1025 | ||
1026 | /* Maybe do something here to the TTY struct as well? */ | |
1027 | } | |
1028 | ||
0b99d589 LL |
1029 | /* |
1030 | * Allocate channel buffers for read/write/error. | |
1031 | * Set flag, so we don't get trounced on. | |
1032 | */ | |
1033 | ch->ch_flags |= (CH_OPENING); | |
1034 | ||
1035 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
a44b508a | 1036 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1037 | |
1038 | if (!ch->ch_rqueue) | |
52f9d668 | 1039 | ch->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1040 | if (!ch->ch_equeue) |
52f9d668 | 1041 | ch->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1042 | if (!ch->ch_wqueue) |
52f9d668 | 1043 | ch->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1044 | |
16f10a82 DY |
1045 | if (!ch->ch_rqueue || !ch->ch_equeue || !ch->ch_wqueue) { |
1046 | kfree(ch->ch_rqueue); | |
1047 | kfree(ch->ch_equeue); | |
1048 | kfree(ch->ch_wqueue); | |
1049 | ||
1050 | return -ENOMEM; | |
1051 | } | |
1052 | ||
a44b508a | 1053 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1054 | |
1055 | ch->ch_flags &= ~(CH_OPENING); | |
1056 | wake_up_interruptible(&ch->ch_flags_wait); | |
1057 | ||
1058 | /* | |
1059 | * Initialize if neither terminal or printer is open. | |
1060 | */ | |
1061 | if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_ISOPEN)) { | |
0b99d589 LL |
1062 | /* |
1063 | * Flush input queues. | |
1064 | */ | |
587abd7b SL |
1065 | ch->ch_r_head = 0; |
1066 | ch->ch_r_tail = 0; | |
1067 | ch->ch_e_head = 0; | |
1068 | ch->ch_e_tail = 0; | |
1069 | ch->ch_w_head = 0; | |
1070 | ch->ch_w_tail = 0; | |
0b99d589 LL |
1071 | |
1072 | brd->bd_ops->flush_uart_write(ch); | |
1073 | brd->bd_ops->flush_uart_read(ch); | |
1074 | ||
1075 | ch->ch_flags = 0; | |
1076 | ch->ch_cached_lsr = 0; | |
1077 | ch->ch_stop_sending_break = 0; | |
1078 | ch->ch_stops_sent = 0; | |
1079 | ||
22e3de76 LL |
1080 | ch->ch_c_cflag = tty->termios.c_cflag; |
1081 | ch->ch_c_iflag = tty->termios.c_iflag; | |
1082 | ch->ch_c_oflag = tty->termios.c_oflag; | |
1083 | ch->ch_c_lflag = tty->termios.c_lflag; | |
1084 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
1085 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
1086 | |
1087 | /* | |
1088 | * Bring up RTS and DTR... | |
1089 | * Also handle RTS or DTR toggle if set. | |
1090 | */ | |
1091 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
1092 | ch->ch_mostat |= (UART_MCR_RTS); | |
1093 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
1094 | ch->ch_mostat |= (UART_MCR_DTR); | |
1095 | ||
1096 | /* Tell UART to init itself */ | |
1097 | brd->bd_ops->uart_init(ch); | |
1098 | } | |
1099 | ||
1100 | /* | |
1101 | * Run param in case we changed anything | |
1102 | */ | |
1103 | brd->bd_ops->param(tty); | |
1104 | ||
1105 | dgnc_carrier(ch); | |
1106 | ||
8b07d521 | 1107 | /* |
0b99d589 LL |
1108 | * follow protocol for opening port |
1109 | */ | |
1110 | ||
a44b508a | 1111 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1112 | |
1113 | rc = dgnc_block_til_ready(tty, file, ch); | |
1114 | ||
0b99d589 | 1115 | /* No going back now, increment our unit and channel counters */ |
a44b508a | 1116 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1117 | ch->ch_open_count++; |
1118 | un->un_open_count++; | |
1119 | un->un_flags |= (UN_ISOPEN); | |
a44b508a | 1120 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1121 | |
8f90ef80 | 1122 | return rc; |
0b99d589 LL |
1123 | } |
1124 | ||
8b07d521 | 1125 | /* |
0b99d589 LL |
1126 | * dgnc_block_til_ready() |
1127 | * | |
1128 | * Wait for DCD, if needed. | |
1129 | */ | |
851f306d CM |
1130 | static int dgnc_block_til_ready(struct tty_struct *tty, |
1131 | struct file *file, | |
1132 | struct channel_t *ch) | |
8b07d521 | 1133 | { |
0b99d589 | 1134 | int retval = 0; |
10334418 | 1135 | struct un_t *un = tty->driver_data; |
a44b508a | 1136 | unsigned long flags; |
0b99d589 LL |
1137 | uint old_flags = 0; |
1138 | int sleep_on_un_flags = 0; | |
1139 | ||
10334418 | 1140 | if (!file) |
8f90ef80 | 1141 | return -ENXIO; |
0b99d589 | 1142 | |
a44b508a | 1143 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1144 | |
1145 | ch->ch_wopen++; | |
1146 | ||
1147 | /* Loop forever */ | |
1148 | while (1) { | |
0b99d589 LL |
1149 | sleep_on_un_flags = 0; |
1150 | ||
1151 | /* | |
851f306d CM |
1152 | * If board has failed somehow during our sleep, |
1153 | * bail with error. | |
0b99d589 LL |
1154 | */ |
1155 | if (ch->ch_bd->state == BOARD_FAILED) { | |
1156 | retval = -ENXIO; | |
1157 | break; | |
1158 | } | |
1159 | ||
1160 | /* If tty was hung up, break out of loop and set error. */ | |
1161 | if (tty_hung_up_p(file)) { | |
1162 | retval = -EAGAIN; | |
1163 | break; | |
1164 | } | |
1165 | ||
1166 | /* | |
1167 | * If either unit is in the middle of the fragile part of close, | |
1168 | * we just cannot touch the channel safely. | |
1169 | * Go back to sleep, knowing that when the channel can be | |
8b07d521 | 1170 | * touched safely, the close routine will signal the |
0b99d589 LL |
1171 | * ch_wait_flags to wake us back up. |
1172 | */ | |
851f306d CM |
1173 | if (!((ch->ch_tun.un_flags | |
1174 | ch->ch_pun.un_flags) & | |
1175 | UN_CLOSING)) { | |
0b99d589 LL |
1176 | /* |
1177 | * Our conditions to leave cleanly and happily: | |
1178 | * 1) NONBLOCKING on the tty is set. | |
1179 | * 2) CLOCAL is set. | |
1180 | * 3) DCD (fake or real) is active. | |
1181 | */ | |
1182 | ||
50667c67 | 1183 | if (file->f_flags & O_NONBLOCK) |
0b99d589 | 1184 | break; |
0b99d589 | 1185 | |
18900ca6 | 1186 | if (tty_io_error(tty)) { |
0b99d589 LL |
1187 | retval = -EIO; |
1188 | break; | |
1189 | } | |
1190 | ||
f1e51745 | 1191 | if (ch->ch_flags & CH_CD) |
0b99d589 | 1192 | break; |
0b99d589 | 1193 | |
f1e51745 | 1194 | if (ch->ch_flags & CH_FCAR) |
0b99d589 | 1195 | break; |
2000c581 | 1196 | } else { |
0b99d589 LL |
1197 | sleep_on_un_flags = 1; |
1198 | } | |
1199 | ||
1200 | /* | |
1201 | * If there is a signal pending, the user probably | |
1202 | * interrupted (ctrl-c) us. | |
1203 | * Leave loop with error set. | |
1204 | */ | |
1205 | if (signal_pending(current)) { | |
0b99d589 LL |
1206 | retval = -ERESTARTSYS; |
1207 | break; | |
1208 | } | |
1209 | ||
0b99d589 LL |
1210 | /* |
1211 | * Store the flags before we let go of channel lock | |
1212 | */ | |
1213 | if (sleep_on_un_flags) | |
1214 | old_flags = ch->ch_tun.un_flags | ch->ch_pun.un_flags; | |
1215 | else | |
1216 | old_flags = ch->ch_flags; | |
1217 | ||
1218 | /* | |
1219 | * Let go of channel lock before calling schedule. | |
1220 | * Our poller will get any FEP events and wake us up when DCD | |
1221 | * eventually goes active. | |
1222 | */ | |
1223 | ||
a44b508a | 1224 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1225 | |
0b99d589 | 1226 | /* |
851f306d CM |
1227 | * Wait for something in the flags to change |
1228 | * from the current value. | |
0b99d589 | 1229 | */ |
50667c67 | 1230 | if (sleep_on_un_flags) |
0b99d589 | 1231 | retval = wait_event_interruptible(un->un_flags_wait, |
851f306d CM |
1232 | (old_flags != (ch->ch_tun.un_flags | |
1233 | ch->ch_pun.un_flags))); | |
50667c67 | 1234 | else |
0b99d589 LL |
1235 | retval = wait_event_interruptible(ch->ch_flags_wait, |
1236 | (old_flags != ch->ch_flags)); | |
0b99d589 | 1237 | |
0b99d589 LL |
1238 | /* |
1239 | * We got woken up for some reason. | |
1240 | * Before looping around, grab our channel lock. | |
1241 | */ | |
a44b508a | 1242 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1243 | } |
1244 | ||
1245 | ch->ch_wopen--; | |
1246 | ||
a44b508a | 1247 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1248 | |
36e712a8 | 1249 | return retval; |
0b99d589 LL |
1250 | } |
1251 | ||
0b99d589 LL |
1252 | /* |
1253 | * dgnc_tty_hangup() | |
1254 | * | |
1255 | * Hangup the port. Like a close, but don't wait for output to drain. | |
8b07d521 | 1256 | */ |
0b99d589 LL |
1257 | static void dgnc_tty_hangup(struct tty_struct *tty) |
1258 | { | |
0b99d589 LL |
1259 | if (!tty || tty->magic != TTY_MAGIC) |
1260 | return; | |
1261 | ||
0b99d589 LL |
1262 | /* flush the transmit queues */ |
1263 | dgnc_tty_flush_buffer(tty); | |
0b99d589 LL |
1264 | } |
1265 | ||
0b99d589 LL |
1266 | /* |
1267 | * dgnc_tty_close() | |
1268 | * | |
1269 | */ | |
1270 | static void dgnc_tty_close(struct tty_struct *tty, struct file *file) | |
1271 | { | |
03425f55 | 1272 | struct dgnc_board *bd; |
0b99d589 LL |
1273 | struct channel_t *ch; |
1274 | struct un_t *un; | |
a44b508a | 1275 | unsigned long flags; |
0b99d589 LL |
1276 | |
1277 | if (!tty || tty->magic != TTY_MAGIC) | |
1278 | return; | |
1279 | ||
1280 | un = tty->driver_data; | |
1281 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1282 | return; | |
1283 | ||
1284 | ch = un->un_ch; | |
1285 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1286 | return; | |
1287 | ||
1288 | bd = ch->ch_bd; | |
1289 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1290 | return; | |
1291 | ||
a44b508a | 1292 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1293 | |
1294 | /* | |
1295 | * Determine if this is the last close or not - and if we agree about | |
1296 | * which type of close it is with the Line Discipline | |
1297 | */ | |
1298 | if ((tty->count == 1) && (un->un_open_count != 1)) { | |
1299 | /* | |
1300 | * Uh, oh. tty->count is 1, which means that the tty | |
1301 | * structure will be freed. un_open_count should always | |
1302 | * be one in these conditions. If it's greater than | |
1303 | * one, we've got real problems, since it means the | |
1304 | * serial port won't be shutdown. | |
1305 | */ | |
1f26adc9 RD |
1306 | dev_dbg(tty->dev, |
1307 | "tty->count is 1, un open count is %d\n", | |
1308 | un->un_open_count); | |
0b99d589 | 1309 | un->un_open_count = 1; |
8b07d521 | 1310 | } |
0b99d589 | 1311 | |
3098e514 DY |
1312 | if (un->un_open_count) |
1313 | un->un_open_count--; | |
1314 | else | |
1f26adc9 RD |
1315 | dev_dbg(tty->dev, |
1316 | "bad serial port open count of %d\n", | |
1317 | un->un_open_count); | |
0b99d589 LL |
1318 | |
1319 | ch->ch_open_count--; | |
1320 | ||
1321 | if (ch->ch_open_count && un->un_open_count) { | |
a44b508a | 1322 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
90d2a471 LL |
1323 | return; |
1324 | } | |
0b99d589 LL |
1325 | |
1326 | /* OK, its the last close on the unit */ | |
0b99d589 LL |
1327 | un->un_flags |= UN_CLOSING; |
1328 | ||
1329 | tty->closing = 1; | |
1330 | ||
0b99d589 LL |
1331 | /* |
1332 | * Only officially close channel if count is 0 and | |
90d2a471 | 1333 | * DIGI_PRINTER bit is not set. |
0b99d589 | 1334 | */ |
851f306d CM |
1335 | if ((ch->ch_open_count == 0) && |
1336 | !(ch->ch_digi.digi_flags & DIGI_PRINTER)) { | |
0b99d589 LL |
1337 | ch->ch_flags &= ~(CH_STOPI | CH_FORCED_STOPI); |
1338 | ||
1339 | /* | |
1340 | * turn off print device when closing print device. | |
1341 | */ | |
9cdf838b | 1342 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1343 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1344 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1345 | ch->ch_flags &= ~CH_PRON; |
1346 | } | |
1347 | ||
a44b508a | 1348 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1349 | /* wait for output to drain */ |
1350 | /* This will also return if we take an interrupt */ | |
1351 | ||
2d9920ec | 1352 | bd->bd_ops->drain(tty, 0); |
0b99d589 | 1353 | |
0b99d589 LL |
1354 | dgnc_tty_flush_buffer(tty); |
1355 | tty_ldisc_flush(tty); | |
1356 | ||
a44b508a | 1357 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1358 | |
1359 | tty->closing = 0; | |
1360 | ||
1361 | /* | |
1362 | * If we have HUPCL set, lower DTR and RTS | |
1363 | */ | |
1364 | if (ch->ch_c_cflag & HUPCL) { | |
0b99d589 LL |
1365 | /* Drop RTS/DTR */ |
1366 | ch->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
1367 | bd->bd_ops->assert_modem_signals(ch); | |
1368 | ||
1369 | /* | |
8b07d521 | 1370 | * Go to sleep to ensure RTS/DTR |
0b99d589 LL |
1371 | * have been dropped for modems to see it. |
1372 | */ | |
1373 | if (ch->ch_close_delay) { | |
a44b508a RD |
1374 | spin_unlock_irqrestore(&ch->ch_lock, |
1375 | flags); | |
0b99d589 | 1376 | dgnc_ms_sleep(ch->ch_close_delay); |
a44b508a | 1377 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1378 | } |
1379 | } | |
1380 | ||
1381 | ch->ch_old_baud = 0; | |
1382 | ||
1383 | /* Turn off UART interrupts for this port */ | |
1384 | ch->ch_bd->bd_ops->uart_off(ch); | |
2000c581 | 1385 | } else { |
0b99d589 LL |
1386 | /* |
1387 | * turn off print device when closing print device. | |
1388 | */ | |
9cdf838b | 1389 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1390 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1391 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1392 | ch->ch_flags &= ~CH_PRON; |
1393 | } | |
1394 | } | |
1395 | ||
1396 | un->un_tty = NULL; | |
1397 | un->un_flags &= ~(UN_ISOPEN | UN_CLOSING); | |
1398 | ||
0b99d589 LL |
1399 | wake_up_interruptible(&ch->ch_flags_wait); |
1400 | wake_up_interruptible(&un->un_flags_wait); | |
1401 | ||
a44b508a | 1402 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1403 | } |
1404 | ||
0b99d589 LL |
1405 | /* |
1406 | * dgnc_tty_chars_in_buffer() | |
1407 | * | |
1408 | * Return number of characters that have not been transmitted yet. | |
1409 | * | |
1410 | * This routine is used by the line discipline to determine if there | |
1411 | * is data waiting to be transmitted/drained/flushed or not. | |
1412 | */ | |
1413 | static int dgnc_tty_chars_in_buffer(struct tty_struct *tty) | |
1414 | { | |
1415 | struct channel_t *ch = NULL; | |
1416 | struct un_t *un = NULL; | |
1417 | ushort thead; | |
1418 | ushort ttail; | |
1419 | uint tmask; | |
1420 | uint chars = 0; | |
a44b508a | 1421 | unsigned long flags; |
0b99d589 | 1422 | |
60acb623 | 1423 | if (!tty) |
8f90ef80 | 1424 | return 0; |
0b99d589 LL |
1425 | |
1426 | un = tty->driver_data; | |
1427 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1428 | return 0; |
0b99d589 LL |
1429 | |
1430 | ch = un->un_ch; | |
1431 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1432 | return 0; |
0b99d589 | 1433 | |
a44b508a | 1434 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1435 | |
1436 | tmask = WQUEUEMASK; | |
1437 | thead = ch->ch_w_head & tmask; | |
1438 | ttail = ch->ch_w_tail & tmask; | |
1439 | ||
a44b508a | 1440 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1441 | |
1442 | if (ttail == thead) { | |
1443 | chars = 0; | |
1444 | } else { | |
1445 | if (thead >= ttail) | |
1446 | chars = thead - ttail; | |
1447 | else | |
1448 | chars = thead - ttail + WQUEUESIZE; | |
1449 | } | |
1450 | ||
8f90ef80 | 1451 | return chars; |
0b99d589 LL |
1452 | } |
1453 | ||
8b07d521 | 1454 | /* |
0b99d589 LL |
1455 | * dgnc_maxcps_room |
1456 | * | |
1457 | * Reduces bytes_available to the max number of characters | |
1458 | * that can be sent currently given the maxcps value, and | |
1459 | * returns the new bytes_available. This only affects printer | |
1460 | * output. | |
8b07d521 | 1461 | */ |
107b40ad | 1462 | static int dgnc_maxcps_room(struct channel_t *ch, int bytes_available) |
0b99d589 | 1463 | { |
9cdf838b | 1464 | if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0) { |
0b99d589 LL |
1465 | int cps_limit = 0; |
1466 | unsigned long current_time = jiffies; | |
1467 | unsigned long buffer_time = current_time + | |
851f306d CM |
1468 | (HZ * ch->ch_digi.digi_bufsize) / |
1469 | ch->ch_digi.digi_maxcps; | |
0b99d589 LL |
1470 | |
1471 | if (ch->ch_cpstime < current_time) { | |
1472 | /* buffer is empty */ | |
851f306d | 1473 | ch->ch_cpstime = current_time; /* reset ch_cpstime */ |
0b99d589 | 1474 | cps_limit = ch->ch_digi.digi_bufsize; |
2000c581 | 1475 | } else if (ch->ch_cpstime < buffer_time) { |
0b99d589 | 1476 | /* still room in the buffer */ |
851f306d CM |
1477 | cps_limit = ((buffer_time - ch->ch_cpstime) * |
1478 | ch->ch_digi.digi_maxcps) / HZ; | |
2000c581 | 1479 | } else { |
0b99d589 | 1480 | /* no room in the buffer */ |
8b07d521 | 1481 | cps_limit = 0; |
0b99d589 LL |
1482 | } |
1483 | ||
1484 | bytes_available = min(cps_limit, bytes_available); | |
1485 | } | |
1486 | ||
8f90ef80 | 1487 | return bytes_available; |
0b99d589 LL |
1488 | } |
1489 | ||
0b99d589 LL |
1490 | /* |
1491 | * dgnc_tty_write_room() | |
1492 | * | |
1493 | * Return space available in Tx buffer | |
8b07d521 | 1494 | */ |
0b99d589 LL |
1495 | static int dgnc_tty_write_room(struct tty_struct *tty) |
1496 | { | |
1497 | struct channel_t *ch = NULL; | |
1498 | struct un_t *un = NULL; | |
1499 | ushort head; | |
1500 | ushort tail; | |
1501 | ushort tmask; | |
1502 | int ret = 0; | |
a44b508a | 1503 | unsigned long flags; |
0b99d589 | 1504 | |
02782a19 | 1505 | if (!tty) |
8f90ef80 | 1506 | return 0; |
0b99d589 LL |
1507 | |
1508 | un = tty->driver_data; | |
1509 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1510 | return 0; |
0b99d589 LL |
1511 | |
1512 | ch = un->un_ch; | |
1513 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1514 | return 0; |
0b99d589 | 1515 | |
a44b508a | 1516 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1517 | |
1518 | tmask = WQUEUEMASK; | |
1519 | head = (ch->ch_w_head) & tmask; | |
1520 | tail = (ch->ch_w_tail) & tmask; | |
1521 | ||
f7c851d4 CP |
1522 | ret = tail - head - 1; |
1523 | if (ret < 0) | |
0b99d589 LL |
1524 | ret += WQUEUESIZE; |
1525 | ||
1526 | /* Limit printer to maxcps */ | |
107b40ad DY |
1527 | if (un->un_type != DGNC_PRINT) |
1528 | ret = dgnc_maxcps_room(ch, ret); | |
0b99d589 LL |
1529 | |
1530 | /* | |
8b07d521 | 1531 | * If we are printer device, leave space for |
0b99d589 LL |
1532 | * possibly both the on and off strings. |
1533 | */ | |
1534 | if (un->un_type == DGNC_PRINT) { | |
1535 | if (!(ch->ch_flags & CH_PRON)) | |
1536 | ret -= ch->ch_digi.digi_onlen; | |
1537 | ret -= ch->ch_digi.digi_offlen; | |
2000c581 | 1538 | } else { |
0b99d589 LL |
1539 | if (ch->ch_flags & CH_PRON) |
1540 | ret -= ch->ch_digi.digi_offlen; | |
1541 | } | |
1542 | ||
1543 | if (ret < 0) | |
1544 | ret = 0; | |
1545 | ||
a44b508a | 1546 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8b07d521 | 1547 | |
8f90ef80 | 1548 | return ret; |
0b99d589 LL |
1549 | } |
1550 | ||
0b99d589 LL |
1551 | /* |
1552 | * dgnc_tty_put_char() | |
1553 | * | |
1554 | * Put a character into ch->ch_buf | |
8b07d521 | 1555 | * |
0b99d589 LL |
1556 | * - used by the line discipline for OPOST processing |
1557 | */ | |
1558 | static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c) | |
1559 | { | |
1560 | /* | |
1561 | * Simply call tty_write. | |
1562 | */ | |
0b99d589 LL |
1563 | dgnc_tty_write(tty, &c, 1); |
1564 | return 1; | |
1565 | } | |
1566 | ||
0b99d589 LL |
1567 | /* |
1568 | * dgnc_tty_write() | |
1569 | * | |
1570 | * Take data from the user or kernel and send it out to the FEP. | |
1571 | * In here exists all the Transparent Print magic as well. | |
1572 | */ | |
1573 | static int dgnc_tty_write(struct tty_struct *tty, | |
e352d3f1 | 1574 | const unsigned char *buf, int count) |
0b99d589 LL |
1575 | { |
1576 | struct channel_t *ch = NULL; | |
1577 | struct un_t *un = NULL; | |
1578 | int bufcount = 0, n = 0; | |
a44b508a | 1579 | unsigned long flags; |
0b99d589 LL |
1580 | ushort head; |
1581 | ushort tail; | |
1582 | ushort tmask; | |
1583 | uint remain; | |
0b99d589 | 1584 | |
02782a19 | 1585 | if (!tty) |
8f90ef80 | 1586 | return 0; |
0b99d589 LL |
1587 | |
1588 | un = tty->driver_data; | |
1589 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1590 | return 0; |
0b99d589 LL |
1591 | |
1592 | ch = un->un_ch; | |
1593 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1594 | return 0; |
0b99d589 LL |
1595 | |
1596 | if (!count) | |
8f90ef80 | 1597 | return 0; |
0b99d589 | 1598 | |
0b99d589 LL |
1599 | /* |
1600 | * Store original amount of characters passed in. | |
1601 | * This helps to figure out if we should ask the FEP | |
1602 | * to send us an event when it has more space available. | |
1603 | */ | |
0b99d589 | 1604 | |
a44b508a | 1605 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1606 | |
1607 | /* Get our space available for the channel from the board */ | |
1608 | tmask = WQUEUEMASK; | |
1609 | head = (ch->ch_w_head) & tmask; | |
1610 | tail = (ch->ch_w_tail) & tmask; | |
1611 | ||
f7c851d4 CP |
1612 | bufcount = tail - head - 1; |
1613 | if (bufcount < 0) | |
0b99d589 LL |
1614 | bufcount += WQUEUESIZE; |
1615 | ||
0b99d589 LL |
1616 | /* |
1617 | * Limit printer output to maxcps overall, with bursts allowed | |
1618 | * up to bufsize characters. | |
1619 | */ | |
107b40ad DY |
1620 | if (un->un_type != DGNC_PRINT) |
1621 | bufcount = dgnc_maxcps_room(ch, bufcount); | |
0b99d589 LL |
1622 | |
1623 | /* | |
1624 | * Take minimum of what the user wants to send, and the | |
1625 | * space available in the FEP buffer. | |
1626 | */ | |
1627 | count = min(count, bufcount); | |
1628 | ||
1629 | /* | |
1630 | * Bail if no space left. | |
1631 | */ | |
c84a083b QL |
1632 | if (count <= 0) |
1633 | goto exit_retry; | |
0b99d589 LL |
1634 | |
1635 | /* | |
1636 | * Output the printer ON string, if we are in terminal mode, but | |
1637 | * need to be in printer mode. | |
1638 | */ | |
1639 | if ((un->un_type == DGNC_PRINT) && !(ch->ch_flags & CH_PRON)) { | |
1640 | dgnc_wmove(ch, ch->ch_digi.digi_onstr, | |
e352d3f1 | 1641 | (int)ch->ch_digi.digi_onlen); |
0b99d589 LL |
1642 | head = (ch->ch_w_head) & tmask; |
1643 | ch->ch_flags |= CH_PRON; | |
1644 | } | |
1645 | ||
1646 | /* | |
1647 | * On the other hand, output the printer OFF string, if we are | |
1648 | * currently in printer mode, but need to output to the terminal. | |
1649 | */ | |
1650 | if ((un->un_type != DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { | |
1651 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, | |
e352d3f1 | 1652 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1653 | head = (ch->ch_w_head) & tmask; |
1654 | ch->ch_flags &= ~CH_PRON; | |
1655 | } | |
1656 | ||
0b99d589 LL |
1657 | n = count; |
1658 | ||
1659 | /* | |
1660 | * If the write wraps over the top of the circular buffer, | |
1661 | * move the portion up to the wrap point, and reset the | |
1662 | * pointers to the bottom. | |
1663 | */ | |
1664 | remain = WQUEUESIZE - head; | |
1665 | ||
1666 | if (n >= remain) { | |
1667 | n -= remain; | |
1668 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1669 | head = 0; |
1670 | buf += remain; | |
1671 | } | |
1672 | ||
1673 | if (n > 0) { | |
1674 | /* | |
1675 | * Move rest of data. | |
1676 | */ | |
1677 | remain = n; | |
1678 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1679 | head += remain; |
1680 | } | |
1681 | ||
1682 | if (count) { | |
1683 | head &= tmask; | |
1684 | ch->ch_w_head = head; | |
1685 | } | |
1686 | ||
0b99d589 | 1687 | /* Update printer buffer empty time. */ |
8d0d4cc5 RS |
1688 | if ((un->un_type == DGNC_PRINT) && (ch->ch_digi.digi_maxcps > 0) && |
1689 | (ch->ch_digi.digi_bufsize > 0)) { | |
90d2a471 | 1690 | ch->ch_cpstime += (HZ * count) / ch->ch_digi.digi_maxcps; |
0b99d589 LL |
1691 | } |
1692 | ||
a74d8e21 | 1693 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1694 | |
0b99d589 LL |
1695 | if (count) { |
1696 | /* | |
1697 | * Channel lock is grabbed and then released | |
1698 | * inside this routine. | |
1699 | */ | |
1700 | ch->ch_bd->bd_ops->copy_data_from_queue_to_uart(ch); | |
1701 | } | |
1702 | ||
8f90ef80 | 1703 | return count; |
c84a083b QL |
1704 | |
1705 | exit_retry: | |
1706 | ||
1707 | spin_unlock_irqrestore(&ch->ch_lock, flags); | |
1708 | return 0; | |
0b99d589 LL |
1709 | } |
1710 | ||
0b99d589 LL |
1711 | /* |
1712 | * Return modem signals to ld. | |
1713 | */ | |
b74c7461 | 1714 | |
0b99d589 | 1715 | static int dgnc_tty_tiocmget(struct tty_struct *tty) |
0b99d589 LL |
1716 | { |
1717 | struct channel_t *ch; | |
1718 | struct un_t *un; | |
1719 | int result = -EIO; | |
446393e9 | 1720 | unsigned char mstat = 0; |
a44b508a | 1721 | unsigned long flags; |
0b99d589 LL |
1722 | |
1723 | if (!tty || tty->magic != TTY_MAGIC) | |
1724 | return result; | |
1725 | ||
1726 | un = tty->driver_data; | |
1727 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1728 | return result; | |
1729 | ||
1730 | ch = un->un_ch; | |
1731 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1732 | return result; | |
1733 | ||
a44b508a | 1734 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1735 | |
0b7ceaa6 | 1736 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1737 | |
a44b508a | 1738 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1739 | |
1740 | result = 0; | |
1741 | ||
1742 | if (mstat & UART_MCR_DTR) | |
1743 | result |= TIOCM_DTR; | |
1744 | if (mstat & UART_MCR_RTS) | |
1745 | result |= TIOCM_RTS; | |
1746 | if (mstat & UART_MSR_CTS) | |
1747 | result |= TIOCM_CTS; | |
1748 | if (mstat & UART_MSR_DSR) | |
1749 | result |= TIOCM_DSR; | |
1750 | if (mstat & UART_MSR_RI) | |
1751 | result |= TIOCM_RI; | |
1752 | if (mstat & UART_MSR_DCD) | |
1753 | result |= TIOCM_CD; | |
1754 | ||
0b99d589 LL |
1755 | return result; |
1756 | } | |
1757 | ||
0b99d589 LL |
1758 | /* |
1759 | * dgnc_tty_tiocmset() | |
1760 | * | |
1761 | * Set modem signals, called by ld. | |
1762 | */ | |
b74c7461 | 1763 | |
0b99d589 | 1764 | static int dgnc_tty_tiocmset(struct tty_struct *tty, |
e352d3f1 | 1765 | unsigned int set, unsigned int clear) |
0b99d589 | 1766 | { |
03425f55 | 1767 | struct dgnc_board *bd; |
0b99d589 LL |
1768 | struct channel_t *ch; |
1769 | struct un_t *un; | |
1770 | int ret = -EIO; | |
a44b508a | 1771 | unsigned long flags; |
0b99d589 LL |
1772 | |
1773 | if (!tty || tty->magic != TTY_MAGIC) | |
1774 | return ret; | |
1775 | ||
1776 | un = tty->driver_data; | |
1777 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1778 | return ret; | |
1779 | ||
1780 | ch = un->un_ch; | |
1781 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1782 | return ret; | |
1783 | ||
1784 | bd = ch->ch_bd; | |
1785 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1786 | return ret; | |
1787 | ||
a44b508a | 1788 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1789 | |
50667c67 | 1790 | if (set & TIOCM_RTS) |
0b99d589 | 1791 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 1792 | |
50667c67 | 1793 | if (set & TIOCM_DTR) |
0b99d589 | 1794 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 | 1795 | |
50667c67 | 1796 | if (clear & TIOCM_RTS) |
0b99d589 | 1797 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 1798 | |
50667c67 | 1799 | if (clear & TIOCM_DTR) |
0b99d589 | 1800 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
1801 | |
1802 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
1803 | ||
a44b508a | 1804 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1805 | |
8f90ef80 | 1806 | return 0; |
0b99d589 LL |
1807 | } |
1808 | ||
0b99d589 LL |
1809 | /* |
1810 | * dgnc_tty_send_break() | |
1811 | * | |
1812 | * Send a Break, called by ld. | |
1813 | */ | |
1814 | static int dgnc_tty_send_break(struct tty_struct *tty, int msec) | |
1815 | { | |
03425f55 | 1816 | struct dgnc_board *bd; |
0b99d589 LL |
1817 | struct channel_t *ch; |
1818 | struct un_t *un; | |
1819 | int ret = -EIO; | |
a44b508a | 1820 | unsigned long flags; |
0b99d589 LL |
1821 | |
1822 | if (!tty || tty->magic != TTY_MAGIC) | |
1823 | return ret; | |
1824 | ||
1825 | un = tty->driver_data; | |
1826 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1827 | return ret; | |
1828 | ||
1829 | ch = un->un_ch; | |
1830 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1831 | return ret; | |
1832 | ||
1833 | bd = ch->ch_bd; | |
1834 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1835 | return ret; | |
1836 | ||
1837 | switch (msec) { | |
1838 | case -1: | |
1839 | msec = 0xFFFF; | |
1840 | break; | |
1841 | case 0: | |
1842 | msec = 0; | |
1843 | break; | |
1844 | default: | |
1845 | break; | |
1846 | } | |
1847 | ||
a44b508a | 1848 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1849 | |
1850 | ch->ch_bd->bd_ops->send_break(ch, msec); | |
1851 | ||
a44b508a | 1852 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1853 | |
8f90ef80 | 1854 | return 0; |
0b99d589 LL |
1855 | } |
1856 | ||
0b99d589 LL |
1857 | /* |
1858 | * dgnc_tty_wait_until_sent() | |
1859 | * | |
1860 | * wait until data has been transmitted, called by ld. | |
1861 | */ | |
1862 | static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
1863 | { | |
03425f55 | 1864 | struct dgnc_board *bd; |
0b99d589 LL |
1865 | struct channel_t *ch; |
1866 | struct un_t *un; | |
0b99d589 LL |
1867 | |
1868 | if (!tty || tty->magic != TTY_MAGIC) | |
1869 | return; | |
1870 | ||
1871 | un = tty->driver_data; | |
1872 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1873 | return; | |
1874 | ||
1875 | ch = un->un_ch; | |
1876 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1877 | return; | |
1878 | ||
1879 | bd = ch->ch_bd; | |
1880 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1881 | return; | |
1882 | ||
2d9920ec | 1883 | bd->bd_ops->drain(tty, 0); |
8b07d521 | 1884 | } |
0b99d589 | 1885 | |
0b99d589 LL |
1886 | /* |
1887 | * dgnc_send_xchar() | |
1888 | * | |
1889 | * send a high priority character, called by ld. | |
1890 | */ | |
1891 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char c) | |
1892 | { | |
03425f55 | 1893 | struct dgnc_board *bd; |
0b99d589 LL |
1894 | struct channel_t *ch; |
1895 | struct un_t *un; | |
a44b508a | 1896 | unsigned long flags; |
0b99d589 LL |
1897 | |
1898 | if (!tty || tty->magic != TTY_MAGIC) | |
1899 | return; | |
1900 | ||
1901 | un = tty->driver_data; | |
1902 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1903 | return; | |
1904 | ||
1905 | ch = un->un_ch; | |
1906 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1907 | return; | |
1908 | ||
1909 | bd = ch->ch_bd; | |
1910 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1911 | return; | |
1912 | ||
f3dadd29 | 1913 | dev_dbg(tty->dev, "dgnc_tty_send_xchar start\n"); |
0b99d589 | 1914 | |
a44b508a | 1915 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1916 | bd->bd_ops->send_immediate_char(ch, c); |
a44b508a | 1917 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1918 | |
f3dadd29 | 1919 | dev_dbg(tty->dev, "dgnc_tty_send_xchar finish\n"); |
8b07d521 | 1920 | } |
0b99d589 | 1921 | |
0b99d589 LL |
1922 | /* |
1923 | * Return modem signals to ld. | |
1924 | */ | |
1925 | static inline int dgnc_get_mstat(struct channel_t *ch) | |
1926 | { | |
1927 | unsigned char mstat; | |
290e3aba | 1928 | int result = 0; |
a44b508a | 1929 | unsigned long flags; |
0b99d589 | 1930 | |
0b99d589 | 1931 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
8f90ef80 | 1932 | return -ENXIO; |
0b99d589 | 1933 | |
a44b508a | 1934 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1935 | |
0b7ceaa6 | 1936 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1937 | |
a44b508a | 1938 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1939 | |
0b99d589 LL |
1940 | if (mstat & UART_MCR_DTR) |
1941 | result |= TIOCM_DTR; | |
1942 | if (mstat & UART_MCR_RTS) | |
1943 | result |= TIOCM_RTS; | |
1944 | if (mstat & UART_MSR_CTS) | |
1945 | result |= TIOCM_CTS; | |
1946 | if (mstat & UART_MSR_DSR) | |
1947 | result |= TIOCM_DSR; | |
1948 | if (mstat & UART_MSR_RI) | |
1949 | result |= TIOCM_RI; | |
1950 | if (mstat & UART_MSR_DCD) | |
1951 | result |= TIOCM_CD; | |
1952 | ||
8f90ef80 | 1953 | return result; |
0b99d589 LL |
1954 | } |
1955 | ||
0b99d589 LL |
1956 | /* |
1957 | * Return modem signals to ld. | |
1958 | */ | |
851f306d CM |
1959 | static int dgnc_get_modem_info(struct channel_t *ch, |
1960 | unsigned int __user *value) | |
0b99d589 | 1961 | { |
a5b90ef7 | 1962 | return put_user(dgnc_get_mstat(ch), value); |
0b99d589 LL |
1963 | } |
1964 | ||
0b99d589 LL |
1965 | /* |
1966 | * dgnc_set_modem_info() | |
1967 | * | |
1968 | * Set modem signals, called by ld. | |
1969 | */ | |
c23b48e0 | 1970 | static int dgnc_set_modem_info(struct channel_t *ch, |
851f306d CM |
1971 | unsigned int command, |
1972 | unsigned int __user *value) | |
0b99d589 | 1973 | { |
0b99d589 LL |
1974 | int ret = -ENXIO; |
1975 | unsigned int arg = 0; | |
a44b508a | 1976 | unsigned long flags; |
0b99d589 | 1977 | |
0b99d589 LL |
1978 | ret = get_user(arg, value); |
1979 | if (ret) | |
8f90ef80 | 1980 | return ret; |
0b99d589 LL |
1981 | |
1982 | switch (command) { | |
1983 | case TIOCMBIS: | |
50667c67 | 1984 | if (arg & TIOCM_RTS) |
0b99d589 | 1985 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 1986 | |
50667c67 | 1987 | if (arg & TIOCM_DTR) |
0b99d589 | 1988 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 LL |
1989 | |
1990 | break; | |
1991 | ||
1992 | case TIOCMBIC: | |
50667c67 | 1993 | if (arg & TIOCM_RTS) |
0b99d589 | 1994 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 1995 | |
50667c67 | 1996 | if (arg & TIOCM_DTR) |
0b99d589 | 1997 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
1998 | |
1999 | break; | |
2000 | ||
90d2a471 | 2001 | case TIOCMSET: |
0b99d589 | 2002 | |
50667c67 | 2003 | if (arg & TIOCM_RTS) |
0b99d589 | 2004 | ch->ch_mostat |= UART_MCR_RTS; |
50667c67 | 2005 | else |
0b99d589 | 2006 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 2007 | |
50667c67 | 2008 | if (arg & TIOCM_DTR) |
0b99d589 | 2009 | ch->ch_mostat |= UART_MCR_DTR; |
50667c67 | 2010 | else |
0b99d589 | 2011 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
2012 | |
2013 | break; | |
2014 | ||
2015 | default: | |
8f90ef80 | 2016 | return -EINVAL; |
0b99d589 LL |
2017 | } |
2018 | ||
a44b508a | 2019 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2020 | |
2021 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
2022 | ||
a44b508a | 2023 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2024 | |
8f90ef80 | 2025 | return 0; |
0b99d589 LL |
2026 | } |
2027 | ||
0b99d589 | 2028 | /* |
8b07d521 | 2029 | * dgnc_tty_digigeta() |
0b99d589 LL |
2030 | * |
2031 | * Ioctl to get the information for ditty. | |
2032 | * | |
2033 | * | |
2034 | * | |
2035 | */ | |
851f306d CM |
2036 | static int dgnc_tty_digigeta(struct tty_struct *tty, |
2037 | struct digi_t __user *retinfo) | |
0b99d589 LL |
2038 | { |
2039 | struct channel_t *ch; | |
2040 | struct un_t *un; | |
2041 | struct digi_t tmp; | |
a44b508a | 2042 | unsigned long flags; |
0b99d589 LL |
2043 | |
2044 | if (!retinfo) | |
8f90ef80 | 2045 | return -EFAULT; |
0b99d589 LL |
2046 | |
2047 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2048 | return -EFAULT; |
0b99d589 LL |
2049 | |
2050 | un = tty->driver_data; | |
2051 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2052 | return -EFAULT; |
0b99d589 LL |
2053 | |
2054 | ch = un->un_ch; | |
2055 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2056 | return -EFAULT; |
0b99d589 LL |
2057 | |
2058 | memset(&tmp, 0, sizeof(tmp)); | |
2059 | ||
a44b508a | 2060 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2061 | memcpy(&tmp, &ch->ch_digi, sizeof(tmp)); |
a44b508a | 2062 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2063 | |
2064 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) | |
8f90ef80 | 2065 | return -EFAULT; |
0b99d589 | 2066 | |
8f90ef80 | 2067 | return 0; |
0b99d589 LL |
2068 | } |
2069 | ||
0b99d589 | 2070 | /* |
8b07d521 | 2071 | * dgnc_tty_digiseta() |
0b99d589 LL |
2072 | * |
2073 | * Ioctl to set the information for ditty. | |
2074 | * | |
2075 | * | |
2076 | * | |
2077 | */ | |
851f306d CM |
2078 | static int dgnc_tty_digiseta(struct tty_struct *tty, |
2079 | struct digi_t __user *new_info) | |
0b99d589 | 2080 | { |
03425f55 | 2081 | struct dgnc_board *bd; |
0b99d589 LL |
2082 | struct channel_t *ch; |
2083 | struct un_t *un; | |
2084 | struct digi_t new_digi; | |
a44b508a | 2085 | unsigned long flags; |
0b99d589 | 2086 | |
0b99d589 | 2087 | if (!tty || tty->magic != TTY_MAGIC) |
8f90ef80 | 2088 | return -EFAULT; |
0b99d589 LL |
2089 | |
2090 | un = tty->driver_data; | |
2091 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2092 | return -EFAULT; |
0b99d589 LL |
2093 | |
2094 | ch = un->un_ch; | |
2095 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2096 | return -EFAULT; |
0b99d589 LL |
2097 | |
2098 | bd = ch->ch_bd; | |
2099 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2100 | return -EFAULT; |
0b99d589 | 2101 | |
f1e51745 | 2102 | if (copy_from_user(&new_digi, new_info, sizeof(new_digi))) |
8f90ef80 | 2103 | return -EFAULT; |
0b99d589 | 2104 | |
a44b508a | 2105 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2106 | |
2107 | /* | |
2108 | * Handle transistions to and from RTS Toggle. | |
2109 | */ | |
851f306d CM |
2110 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2111 | (new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 | 2112 | ch->ch_mostat &= ~(UART_MCR_RTS); |
851f306d CM |
2113 | if ((ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2114 | !(new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 LL |
2115 | ch->ch_mostat |= (UART_MCR_RTS); |
2116 | ||
2117 | /* | |
2118 | * Handle transistions to and from DTR Toggle. | |
2119 | */ | |
851f306d CM |
2120 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2121 | (new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 | 2122 | ch->ch_mostat &= ~(UART_MCR_DTR); |
851f306d CM |
2123 | if ((ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2124 | !(new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 LL |
2125 | ch->ch_mostat |= (UART_MCR_DTR); |
2126 | ||
a07bf39a | 2127 | memcpy(&ch->ch_digi, &new_digi, sizeof(new_digi)); |
0b99d589 | 2128 | |
8b07d521 | 2129 | if (ch->ch_digi.digi_maxcps < 1) |
0b99d589 LL |
2130 | ch->ch_digi.digi_maxcps = 1; |
2131 | ||
8b07d521 | 2132 | if (ch->ch_digi.digi_maxcps > 10000) |
0b99d589 LL |
2133 | ch->ch_digi.digi_maxcps = 10000; |
2134 | ||
2135 | if (ch->ch_digi.digi_bufsize < 10) | |
2136 | ch->ch_digi.digi_bufsize = 10; | |
2137 | ||
2138 | if (ch->ch_digi.digi_maxchar < 1) | |
2139 | ch->ch_digi.digi_maxchar = 1; | |
2140 | ||
2141 | if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize) | |
2142 | ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize; | |
2143 | ||
2144 | if (ch->ch_digi.digi_onlen > DIGI_PLEN) | |
2145 | ch->ch_digi.digi_onlen = DIGI_PLEN; | |
2146 | ||
2147 | if (ch->ch_digi.digi_offlen > DIGI_PLEN) | |
2148 | ch->ch_digi.digi_offlen = DIGI_PLEN; | |
2149 | ||
2150 | ch->ch_bd->bd_ops->param(tty); | |
2151 | ||
a44b508a | 2152 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2153 | |
8f90ef80 | 2154 | return 0; |
0b99d589 LL |
2155 | } |
2156 | ||
0b99d589 LL |
2157 | /* |
2158 | * dgnc_set_termios() | |
2159 | */ | |
851f306d CM |
2160 | static void dgnc_tty_set_termios(struct tty_struct *tty, |
2161 | struct ktermios *old_termios) | |
0b99d589 | 2162 | { |
03425f55 | 2163 | struct dgnc_board *bd; |
0b99d589 LL |
2164 | struct channel_t *ch; |
2165 | struct un_t *un; | |
a44b508a | 2166 | unsigned long flags; |
0b99d589 LL |
2167 | |
2168 | if (!tty || tty->magic != TTY_MAGIC) | |
2169 | return; | |
2170 | ||
2171 | un = tty->driver_data; | |
2172 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2173 | return; | |
2174 | ||
2175 | ch = un->un_ch; | |
2176 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2177 | return; | |
2178 | ||
2179 | bd = ch->ch_bd; | |
2180 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2181 | return; | |
2182 | ||
a44b508a | 2183 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2184 | |
22e3de76 LL |
2185 | ch->ch_c_cflag = tty->termios.c_cflag; |
2186 | ch->ch_c_iflag = tty->termios.c_iflag; | |
2187 | ch->ch_c_oflag = tty->termios.c_oflag; | |
2188 | ch->ch_c_lflag = tty->termios.c_lflag; | |
2189 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
2190 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
2191 | |
2192 | ch->ch_bd->bd_ops->param(tty); | |
2193 | dgnc_carrier(ch); | |
2194 | ||
a44b508a | 2195 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2196 | } |
2197 | ||
0b99d589 LL |
2198 | static void dgnc_tty_throttle(struct tty_struct *tty) |
2199 | { | |
2200 | struct channel_t *ch; | |
2201 | struct un_t *un; | |
a44b508a | 2202 | unsigned long flags; |
0b99d589 LL |
2203 | |
2204 | if (!tty || tty->magic != TTY_MAGIC) | |
2205 | return; | |
2206 | ||
2207 | un = tty->driver_data; | |
2208 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2209 | return; | |
8b07d521 | 2210 | |
90d2a471 LL |
2211 | ch = un->un_ch; |
2212 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2213 | return; | |
0b99d589 | 2214 | |
a44b508a | 2215 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2216 | |
2217 | ch->ch_flags |= (CH_FORCED_STOPI); | |
2218 | ||
a44b508a | 2219 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2220 | } |
2221 | ||
0b99d589 LL |
2222 | static void dgnc_tty_unthrottle(struct tty_struct *tty) |
2223 | { | |
2224 | struct channel_t *ch; | |
2225 | struct un_t *un; | |
a44b508a | 2226 | unsigned long flags; |
0b99d589 LL |
2227 | |
2228 | if (!tty || tty->magic != TTY_MAGIC) | |
2229 | return; | |
2230 | ||
2231 | un = tty->driver_data; | |
2232 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2233 | return; | |
8b07d521 | 2234 | |
90d2a471 LL |
2235 | ch = un->un_ch; |
2236 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2237 | return; | |
0b99d589 | 2238 | |
a44b508a | 2239 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2240 | |
2241 | ch->ch_flags &= ~(CH_FORCED_STOPI); | |
2242 | ||
a44b508a | 2243 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2244 | } |
2245 | ||
0b99d589 LL |
2246 | static void dgnc_tty_start(struct tty_struct *tty) |
2247 | { | |
03425f55 | 2248 | struct dgnc_board *bd; |
0b99d589 LL |
2249 | struct channel_t *ch; |
2250 | struct un_t *un; | |
a44b508a | 2251 | unsigned long flags; |
0b99d589 LL |
2252 | |
2253 | if (!tty || tty->magic != TTY_MAGIC) | |
2254 | return; | |
2255 | ||
2256 | un = tty->driver_data; | |
2257 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2258 | return; | |
8b07d521 | 2259 | |
90d2a471 LL |
2260 | ch = un->un_ch; |
2261 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2262 | return; | |
0b99d589 LL |
2263 | |
2264 | bd = ch->ch_bd; | |
2265 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2266 | return; | |
2267 | ||
a44b508a | 2268 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2269 | |
2270 | ch->ch_flags &= ~(CH_FORCED_STOP); | |
2271 | ||
a44b508a | 2272 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2273 | } |
2274 | ||
0b99d589 LL |
2275 | static void dgnc_tty_stop(struct tty_struct *tty) |
2276 | { | |
03425f55 | 2277 | struct dgnc_board *bd; |
0b99d589 LL |
2278 | struct channel_t *ch; |
2279 | struct un_t *un; | |
a44b508a | 2280 | unsigned long flags; |
0b99d589 LL |
2281 | |
2282 | if (!tty || tty->magic != TTY_MAGIC) | |
2283 | return; | |
2284 | ||
2285 | un = tty->driver_data; | |
2286 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2287 | return; | |
8b07d521 | 2288 | |
90d2a471 LL |
2289 | ch = un->un_ch; |
2290 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2291 | return; | |
0b99d589 LL |
2292 | |
2293 | bd = ch->ch_bd; | |
2294 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2295 | return; | |
2296 | ||
a44b508a | 2297 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2298 | |
2299 | ch->ch_flags |= (CH_FORCED_STOP); | |
2300 | ||
a44b508a | 2301 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2302 | } |
2303 | ||
8b07d521 | 2304 | /* |
0b99d589 LL |
2305 | * dgnc_tty_flush_chars() |
2306 | * | |
2307 | * Flush the cook buffer | |
2308 | * | |
2309 | * Note to self, and any other poor souls who venture here: | |
2310 | * | |
2311 | * flush in this case DOES NOT mean dispose of the data. | |
2312 | * instead, it means "stop buffering and send it if you | |
2313 | * haven't already." Just guess how I figured that out... SRW 2-Jun-98 | |
2314 | * | |
2315 | * It is also always called in interrupt context - JAR 8-Sept-99 | |
2316 | */ | |
2317 | static void dgnc_tty_flush_chars(struct tty_struct *tty) | |
2318 | { | |
03425f55 | 2319 | struct dgnc_board *bd; |
0b99d589 LL |
2320 | struct channel_t *ch; |
2321 | struct un_t *un; | |
a44b508a | 2322 | unsigned long flags; |
0b99d589 LL |
2323 | |
2324 | if (!tty || tty->magic != TTY_MAGIC) | |
2325 | return; | |
2326 | ||
2327 | un = tty->driver_data; | |
2328 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2329 | return; | |
8b07d521 | 2330 | |
90d2a471 LL |
2331 | ch = un->un_ch; |
2332 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2333 | return; | |
0b99d589 LL |
2334 | |
2335 | bd = ch->ch_bd; | |
2336 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2337 | return; | |
2338 | ||
a44b508a | 2339 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2340 | |
2341 | /* Do something maybe here */ | |
2342 | ||
a44b508a | 2343 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2344 | } |
2345 | ||
0b99d589 LL |
2346 | /* |
2347 | * dgnc_tty_flush_buffer() | |
8b07d521 | 2348 | * |
0b99d589 LL |
2349 | * Flush Tx buffer (make in == out) |
2350 | */ | |
2351 | static void dgnc_tty_flush_buffer(struct tty_struct *tty) | |
2352 | { | |
2353 | struct channel_t *ch; | |
2354 | struct un_t *un; | |
a44b508a | 2355 | unsigned long flags; |
0b99d589 LL |
2356 | |
2357 | if (!tty || tty->magic != TTY_MAGIC) | |
2358 | return; | |
2359 | ||
2360 | un = tty->driver_data; | |
2361 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2362 | return; | |
8b07d521 | 2363 | |
90d2a471 LL |
2364 | ch = un->un_ch; |
2365 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2366 | return; | |
0b99d589 | 2367 | |
a44b508a | 2368 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2369 | |
2370 | ch->ch_flags &= ~CH_STOP; | |
2371 | ||
2372 | /* Flush our write queue */ | |
2373 | ch->ch_w_head = ch->ch_w_tail; | |
2374 | ||
2375 | /* Flush UARTs transmit FIFO */ | |
2376 | ch->ch_bd->bd_ops->flush_uart_write(ch); | |
2377 | ||
adcb56f9 RS |
2378 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
2379 | ch->ch_tun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2380 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2381 | } | |
adcb56f9 RS |
2382 | if (ch->ch_pun.un_flags & (UN_LOW | UN_EMPTY)) { |
2383 | ch->ch_pun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2384 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2385 | } | |
2386 | ||
a44b508a | 2387 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2388 | } |
2389 | ||
0b99d589 LL |
2390 | /***************************************************************************** |
2391 | * | |
2392 | * The IOCTL function and all of its helpers | |
2393 | * | |
2394 | *****************************************************************************/ | |
8b07d521 | 2395 | |
0b99d589 LL |
2396 | /* |
2397 | * dgnc_tty_ioctl() | |
2398 | * | |
2399 | * The usual assortment of ioctl's | |
2400 | */ | |
a31cefa2 | 2401 | static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
e352d3f1 | 2402 | unsigned long arg) |
0b99d589 | 2403 | { |
03425f55 | 2404 | struct dgnc_board *bd; |
8670a56f | 2405 | struct board_ops *ch_bd_ops; |
0b99d589 LL |
2406 | struct channel_t *ch; |
2407 | struct un_t *un; | |
2408 | int rc; | |
a44b508a | 2409 | unsigned long flags; |
6f418259 | 2410 | void __user *uarg = (void __user *)arg; |
0b99d589 LL |
2411 | |
2412 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2413 | return -ENODEV; |
0b99d589 LL |
2414 | |
2415 | un = tty->driver_data; | |
2416 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2417 | return -ENODEV; |
0b99d589 LL |
2418 | |
2419 | ch = un->un_ch; | |
2420 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2421 | return -ENODEV; |
0b99d589 LL |
2422 | |
2423 | bd = ch->ch_bd; | |
2424 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2425 | return -ENODEV; |
0b99d589 | 2426 | |
8670a56f DY |
2427 | ch_bd_ops = bd->bd_ops; |
2428 | ||
a44b508a | 2429 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2430 | |
2431 | if (un->un_open_count <= 0) { | |
a44b508a | 2432 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2433 | return -EIO; |
0b99d589 LL |
2434 | } |
2435 | ||
2436 | switch (cmd) { | |
0b99d589 LL |
2437 | /* Here are all the standard ioctl's that we MUST implement */ |
2438 | ||
2439 | case TCSBRK: | |
2440 | /* | |
8b07d521 | 2441 | * TCSBRK is SVID version: non-zero arg --> no break |
0b99d589 LL |
2442 | * this behaviour is exploited by tcdrain(). |
2443 | * | |
2444 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be | |
2445 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2446 | * in the middle: 0.375 seconds. | |
2447 | */ | |
2448 | rc = tty_check_change(tty); | |
a44b508a | 2449 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2450 | if (rc) |
8f90ef80 | 2451 | return rc; |
0b99d589 | 2452 | |
8670a56f | 2453 | rc = ch_bd_ops->drain(tty, 0); |
0b99d589 | 2454 | |
f1e51745 | 2455 | if (rc) |
8f90ef80 | 2456 | return -EINTR; |
0b99d589 | 2457 | |
a44b508a | 2458 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2459 | |
3c4019d3 | 2460 | if (((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP)) |
8670a56f | 2461 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2462 | |
a44b508a | 2463 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2464 | |
8f90ef80 | 2465 | return 0; |
0b99d589 | 2466 | |
0b99d589 | 2467 | case TCSBRKP: |
90d2a471 | 2468 | /* support for POSIX tcsendbreak() |
0b99d589 LL |
2469 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be |
2470 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2471 | * in the middle: 0.375 seconds. | |
2472 | */ | |
2473 | rc = tty_check_change(tty); | |
a44b508a | 2474 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2475 | if (rc) |
8f90ef80 | 2476 | return rc; |
0b99d589 | 2477 | |
8670a56f | 2478 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2479 | if (rc) |
8f90ef80 | 2480 | return -EINTR; |
0b99d589 | 2481 | |
a44b508a | 2482 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2483 | |
8670a56f | 2484 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2485 | |
a44b508a | 2486 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2487 | |
8f90ef80 | 2488 | return 0; |
0b99d589 LL |
2489 | |
2490 | case TIOCSBRK: | |
2491 | rc = tty_check_change(tty); | |
a44b508a | 2492 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2493 | if (rc) |
8f90ef80 | 2494 | return rc; |
0b99d589 | 2495 | |
8670a56f | 2496 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2497 | if (rc) |
8f90ef80 | 2498 | return -EINTR; |
0b99d589 | 2499 | |
a44b508a | 2500 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2501 | |
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 LL |
2507 | |
2508 | case TIOCCBRK: | |
2509 | /* Do Nothing */ | |
a44b508a | 2510 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2511 | return 0; |
2512 | ||
2513 | case TIOCGSOFTCAR: | |
2514 | ||
a44b508a | 2515 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2516 | |
106d43f1 RS |
2517 | return put_user(C_CLOCAL(tty) ? 1 : 0, |
2518 | (unsigned long __user *)arg); | |
0b99d589 LL |
2519 | |
2520 | case TIOCSSOFTCAR: | |
2521 | ||
a44b508a | 2522 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2523 | rc = get_user(arg, (unsigned long __user *)arg); |
0b99d589 | 2524 | if (rc) |
8f90ef80 | 2525 | return rc; |
0b99d589 | 2526 | |
a44b508a | 2527 | spin_lock_irqsave(&ch->ch_lock, flags); |
851f306d CM |
2528 | tty->termios.c_cflag = ((tty->termios.c_cflag & ~CLOCAL) | |
2529 | (arg ? CLOCAL : 0)); | |
8670a56f | 2530 | ch_bd_ops->param(tty); |
a44b508a | 2531 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2532 | |
8f90ef80 | 2533 | return 0; |
8b07d521 | 2534 | |
0b99d589 | 2535 | case TIOCMGET: |
a44b508a | 2536 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2537 | return dgnc_get_modem_info(ch, uarg); |
0b99d589 LL |
2538 | |
2539 | case TIOCMBIS: | |
2540 | case TIOCMBIC: | |
2541 | case TIOCMSET: | |
a44b508a | 2542 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
c23b48e0 | 2543 | return dgnc_set_modem_info(ch, cmd, uarg); |
0b99d589 LL |
2544 | |
2545 | /* | |
2546 | * Here are any additional ioctl's that we want to implement | |
2547 | */ | |
8b07d521 LL |
2548 | |
2549 | case TCFLSH: | |
0b99d589 LL |
2550 | /* |
2551 | * The linux tty driver doesn't have a flush | |
2552 | * input routine for the driver, assuming all backed | |
2553 | * up data is in the line disc. buffers. However, | |
2554 | * we all know that's not the case. Here, we | |
2555 | * act on the ioctl, but then lie and say we didn't | |
2556 | * so the line discipline will process the flush | |
2557 | * also. | |
8b07d521 | 2558 | */ |
0b99d589 LL |
2559 | rc = tty_check_change(tty); |
2560 | if (rc) { | |
a44b508a | 2561 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2562 | return rc; |
0b99d589 LL |
2563 | } |
2564 | ||
2565 | if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) { | |
2566 | ch->ch_r_head = ch->ch_r_tail; | |
8670a56f | 2567 | ch_bd_ops->flush_uart_read(ch); |
0b99d589 LL |
2568 | /* Force queue flow control to be released, if needed */ |
2569 | dgnc_check_queue_flow_control(ch); | |
2570 | } | |
2571 | ||
2572 | if ((arg == TCOFLUSH) || (arg == TCIOFLUSH)) { | |
2573 | if (!(un->un_type == DGNC_PRINT)) { | |
2574 | ch->ch_w_head = ch->ch_w_tail; | |
8670a56f | 2575 | ch_bd_ops->flush_uart_write(ch); |
0b99d589 | 2576 | |
24039c58 | 2577 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
851f306d | 2578 | ch->ch_tun.un_flags &= |
adcb56f9 | 2579 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2580 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2581 | } | |
2582 | ||
2583 | if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) { | |
851f306d | 2584 | ch->ch_pun.un_flags &= |
adcb56f9 | 2585 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2586 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2587 | } | |
0b99d589 LL |
2588 | } |
2589 | } | |
2590 | ||
8b07d521 | 2591 | /* pretend we didn't recognize this IOCTL */ |
a44b508a | 2592 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2593 | return -ENOIOCTLCMD; |
0b99d589 LL |
2594 | case TCSETSF: |
2595 | case TCSETSW: | |
2596 | /* | |
2597 | * The linux tty driver doesn't have a flush | |
2598 | * input routine for the driver, assuming all backed | |
2599 | * up data is in the line disc. buffers. However, | |
2600 | * we all know that's not the case. Here, we | |
2601 | * act on the ioctl, but then lie and say we didn't | |
2602 | * so the line discipline will process the flush | |
2603 | * also. | |
2604 | */ | |
2605 | if (cmd == TCSETSF) { | |
2606 | /* flush rx */ | |
2607 | ch->ch_flags &= ~CH_STOP; | |
2608 | ch->ch_r_head = ch->ch_r_tail; | |
8670a56f | 2609 | ch_bd_ops->flush_uart_read(ch); |
0b99d589 LL |
2610 | /* Force queue flow control to be released, if needed */ |
2611 | dgnc_check_queue_flow_control(ch); | |
2612 | } | |
2613 | ||
2614 | /* now wait for all the output to drain */ | |
a44b508a | 2615 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2616 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2617 | if (rc) |
8f90ef80 | 2618 | return -EINTR; |
0b99d589 LL |
2619 | |
2620 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2621 | return -ENOIOCTLCMD; |
0b99d589 LL |
2622 | |
2623 | case TCSETAW: | |
2624 | ||
a44b508a | 2625 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2626 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2627 | if (rc) |
8f90ef80 | 2628 | return -EINTR; |
0b99d589 LL |
2629 | |
2630 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2631 | return -ENOIOCTLCMD; |
0b99d589 LL |
2632 | |
2633 | case TCXONC: | |
a44b508a | 2634 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2635 | /* Make the ld do it */ |
8f90ef80 | 2636 | return -ENOIOCTLCMD; |
0b99d589 LL |
2637 | |
2638 | case DIGI_GETA: | |
2639 | /* get information for ditty */ | |
a44b508a | 2640 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2641 | return dgnc_tty_digigeta(tty, uarg); |
0b99d589 LL |
2642 | |
2643 | case DIGI_SETAW: | |
2644 | case DIGI_SETAF: | |
2645 | ||
2646 | /* set information for ditty */ | |
2647 | if (cmd == (DIGI_SETAW)) { | |
a44b508a | 2648 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2649 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 SL |
2650 | |
2651 | if (rc) | |
8f90ef80 | 2652 | return -EINTR; |
f1e51745 | 2653 | |
a44b508a | 2654 | spin_lock_irqsave(&ch->ch_lock, flags); |
2000c581 | 2655 | } else { |
0b99d589 LL |
2656 | tty_ldisc_flush(tty); |
2657 | } | |
2658 | /* fall thru */ | |
2659 | ||
2660 | case DIGI_SETA: | |
a44b508a | 2661 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2662 | return dgnc_tty_digiseta(tty, uarg); |
8b07d521 | 2663 | |
0b99d589 LL |
2664 | case DIGI_LOOPBACK: |
2665 | { | |
2666 | uint loopback = 0; | |
851f306d CM |
2667 | /* Let go of locks when accessing user space, |
2668 | * could sleep | |
2669 | */ | |
a44b508a | 2670 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2671 | rc = get_user(loopback, (unsigned int __user *)arg); |
0b99d589 | 2672 | if (rc) |
8f90ef80 | 2673 | return rc; |
a44b508a | 2674 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2675 | |
8b07d521 | 2676 | /* Enable/disable internal loopback for this port */ |
0b99d589 LL |
2677 | if (loopback) |
2678 | ch->ch_flags |= CH_LOOPBACK; | |
2679 | else | |
2680 | ch->ch_flags &= ~(CH_LOOPBACK); | |
2681 | ||
8670a56f | 2682 | ch_bd_ops->param(tty); |
a44b508a | 2683 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2684 | return 0; |
90d2a471 | 2685 | } |
0b99d589 LL |
2686 | |
2687 | case DIGI_GETCUSTOMBAUD: | |
a44b508a | 2688 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
106d43f1 RS |
2689 | return put_user(ch->ch_custom_speed, |
2690 | (unsigned int __user *)arg); | |
0b99d589 LL |
2691 | |
2692 | case DIGI_SETCUSTOMBAUD: | |
2693 | { | |
93c76c9c | 2694 | int new_rate; |
0b99d589 | 2695 | /* Let go of locks when accessing user space, could sleep */ |
a44b508a | 2696 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2697 | rc = get_user(new_rate, (int __user *)arg); |
0b99d589 | 2698 | if (rc) |
8f90ef80 | 2699 | return rc; |
a44b508a | 2700 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2701 | dgnc_set_custom_speed(ch, new_rate); |
8670a56f | 2702 | ch_bd_ops->param(tty); |
a44b508a | 2703 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2704 | return 0; |
90d2a471 | 2705 | } |
0b99d589 LL |
2706 | |
2707 | /* | |
2708 | * This ioctl allows insertion of a character into the front | |
2709 | * of any pending data to be transmitted. | |
2710 | * | |
2711 | * This ioctl is to satify the "Send Character Immediate" | |
2712 | * call that the RealPort protocol spec requires. | |
2713 | */ | |
2714 | case DIGI_REALPORT_SENDIMMEDIATE: | |
2715 | { | |
2716 | unsigned char c; | |
0eaa02e6 | 2717 | |
a44b508a | 2718 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2719 | rc = get_user(c, (unsigned char __user *)arg); |
0b99d589 | 2720 | if (rc) |
8f90ef80 | 2721 | return rc; |
a44b508a | 2722 | spin_lock_irqsave(&ch->ch_lock, flags); |
8670a56f | 2723 | ch_bd_ops->send_immediate_char(ch, c); |
a44b508a | 2724 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2725 | return 0; |
0b99d589 LL |
2726 | } |
2727 | ||
2728 | /* | |
2729 | * This ioctl returns all the current counts for the port. | |
2730 | * | |
2731 | * This ioctl is to satify the "Line Error Counters" | |
2732 | * call that the RealPort protocol spec requires. | |
2733 | */ | |
2734 | case DIGI_REALPORT_GETCOUNTERS: | |
2735 | { | |
2736 | struct digi_getcounter buf; | |
2737 | ||
2738 | buf.norun = ch->ch_err_overrun; | |
feba47a7 | 2739 | buf.noflow = 0; /* The driver doesn't keep this stat */ |
0b99d589 LL |
2740 | buf.nframe = ch->ch_err_frame; |
2741 | buf.nparity = ch->ch_err_parity; | |
2742 | buf.nbreak = ch->ch_err_break; | |
2743 | buf.rbytes = ch->ch_rxcount; | |
2744 | buf.tbytes = ch->ch_txcount; | |
2745 | ||
a44b508a | 2746 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2747 | |
50667c67 | 2748 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2749 | return -EFAULT; |
50667c67 | 2750 | |
8f90ef80 | 2751 | return 0; |
0b99d589 LL |
2752 | } |
2753 | ||
2754 | /* | |
2755 | * This ioctl returns all current events. | |
2756 | * | |
2757 | * This ioctl is to satify the "Event Reporting" | |
2758 | * call that the RealPort protocol spec requires. | |
90d2a471 | 2759 | */ |
0b99d589 LL |
2760 | case DIGI_REALPORT_GETEVENTS: |
2761 | { | |
2762 | unsigned int events = 0; | |
2763 | ||
2764 | /* NOTE: MORE EVENTS NEEDS TO BE ADDED HERE */ | |
2765 | if (ch->ch_flags & CH_BREAK_SENDING) | |
2766 | events |= EV_TXB; | |
851f306d CM |
2767 | if ((ch->ch_flags & CH_STOP) || |
2768 | (ch->ch_flags & CH_FORCED_STOP)) | |
0b99d589 | 2769 | events |= (EV_OPU | EV_OPS); |
50667c67 | 2770 | |
851f306d CM |
2771 | if ((ch->ch_flags & CH_STOPI) || |
2772 | (ch->ch_flags & CH_FORCED_STOPI)) | |
0b99d589 | 2773 | events |= (EV_IPU | EV_IPS); |
0b99d589 | 2774 | |
a44b508a | 2775 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
106d43f1 | 2776 | return put_user(events, (unsigned int __user *)arg); |
0b99d589 LL |
2777 | } |
2778 | ||
2779 | /* | |
2780 | * This ioctl returns TOUT and TIN counters based | |
2781 | * upon the values passed in by the RealPort Server. | |
2782 | * It also passes back whether the UART Transmitter is | |
2783 | * empty as well. | |
90d2a471 | 2784 | */ |
0b99d589 LL |
2785 | case DIGI_REALPORT_GETBUFFERS: |
2786 | { | |
2787 | struct digi_getbuffer buf; | |
2788 | int tdist; | |
2789 | int count; | |
2790 | ||
a44b508a | 2791 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2792 | |
2793 | /* | |
2794 | * Get data from user first. | |
2795 | */ | |
50667c67 | 2796 | if (copy_from_user(&buf, uarg, sizeof(buf))) |
8f90ef80 | 2797 | return -EFAULT; |
0b99d589 | 2798 | |
a44b508a | 2799 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2800 | |
2801 | /* | |
2802 | * Figure out how much data is in our RX and TX queues. | |
2803 | */ | |
2804 | buf.rxbuf = (ch->ch_r_head - ch->ch_r_tail) & RQUEUEMASK; | |
2805 | buf.txbuf = (ch->ch_w_head - ch->ch_w_tail) & WQUEUEMASK; | |
2806 | ||
2807 | /* | |
2808 | * Is the UART empty? Add that value to whats in our TX queue. | |
2809 | */ | |
8670a56f | 2810 | count = buf.txbuf + ch_bd_ops->get_uart_bytes_left(ch); |
0b99d589 LL |
2811 | |
2812 | /* | |
2813 | * Figure out how much data the RealPort Server believes should | |
2814 | * be in our TX queue. | |
2815 | */ | |
b9f84637 | 2816 | tdist = (buf.tx_in - buf.tx_out) & 0xffff; |
0b99d589 LL |
2817 | |
2818 | /* | |
2819 | * If we have more data than the RealPort Server believes we | |
2820 | * should have, reduce our count to its amount. | |
2821 | * | |
2822 | * This count difference CAN happen because the Linux LD can | |
2823 | * insert more characters into our queue for OPOST processing | |
2824 | * that the RealPort Server doesn't know about. | |
2825 | */ | |
50667c67 | 2826 | if (buf.txbuf > tdist) |
0b99d589 | 2827 | buf.txbuf = tdist; |
0b99d589 LL |
2828 | |
2829 | /* | |
2830 | * Report whether our queue and UART TX are completely empty. | |
2831 | */ | |
50667c67 | 2832 | if (count) |
0b99d589 | 2833 | buf.txdone = 0; |
50667c67 | 2834 | else |
0b99d589 | 2835 | buf.txdone = 1; |
0b99d589 | 2836 | |
a44b508a | 2837 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2838 | |
50667c67 | 2839 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2840 | return -EFAULT; |
50667c67 | 2841 | |
8f90ef80 | 2842 | return 0; |
0b99d589 LL |
2843 | } |
2844 | default: | |
a44b508a | 2845 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2846 | |
8f90ef80 | 2847 | return -ENOIOCTLCMD; |
0b99d589 | 2848 | } |
0b99d589 | 2849 | } |