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0b99d589 LL |
1 | /* |
2 | * Copyright 2003 Digi International (www.digi.com) | |
3 | * Scott H Kilau <Scott_Kilau at digi dot com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2, or (at your option) | |
8 | * any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the | |
12 | * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR | |
13 | * PURPOSE. See the GNU General Public License for more details. | |
0b99d589 LL |
14 | */ |
15 | ||
16 | /************************************************************************ | |
8b07d521 | 17 | * |
0b99d589 LL |
18 | * This file implements the tty driver functionality for the |
19 | * Neo and ClassicBoard PCI based product lines. | |
8b07d521 | 20 | * |
0b99d589 LL |
21 | ************************************************************************ |
22 | * | |
0b99d589 LL |
23 | */ |
24 | ||
25 | #include <linux/kernel.h> | |
0b99d589 LL |
26 | #include <linux/sched.h> /* For jiffies, task states */ |
27 | #include <linux/interrupt.h> /* For tasklet and interrupt structs/defines */ | |
28 | #include <linux/module.h> | |
29 | #include <linux/ctype.h> | |
30 | #include <linux/tty.h> | |
31 | #include <linux/tty_flip.h> | |
d533a524 | 32 | #include <linux/types.h> |
0b99d589 LL |
33 | #include <linux/serial_reg.h> |
34 | #include <linux/slab.h> | |
90d2a471 | 35 | #include <linux/delay.h> /* For udelay */ |
fb33cac8 | 36 | #include <linux/uaccess.h> /* For copy_from_user/copy_to_user */ |
0b99d589 | 37 | #include <linux/pci.h> |
0b99d589 LL |
38 | #include "dgnc_driver.h" |
39 | #include "dgnc_tty.h" | |
0b99d589 LL |
40 | #include "dgnc_neo.h" |
41 | #include "dgnc_cls.h" | |
0b99d589 | 42 | #include "dgnc_sysfs.h" |
9a633d00 | 43 | #include "dgnc_utils.h" |
0b99d589 | 44 | |
0b99d589 LL |
45 | /* |
46 | * internal variables | |
47 | */ | |
03425f55 | 48 | static struct dgnc_board *dgnc_BoardsByMajor[256]; |
446393e9 | 49 | static unsigned char *dgnc_TmpWriteBuf; |
0b99d589 LL |
50 | |
51 | /* | |
52 | * Default transparent print information. | |
53 | */ | |
54 | static struct digi_t dgnc_digi_init = { | |
55 | .digi_flags = DIGI_COOK, /* Flags */ | |
56 | .digi_maxcps = 100, /* Max CPS */ | |
57 | .digi_maxchar = 50, /* Max chars in print queue */ | |
58 | .digi_bufsize = 100, /* Printer buffer size */ | |
59 | .digi_onlen = 4, /* size of printer on string */ | |
60 | .digi_offlen = 4, /* size of printer off string */ | |
61 | .digi_onstr = "\033[5i", /* ANSI printer on string ] */ | |
62 | .digi_offstr = "\033[4i", /* ANSI printer off string ] */ | |
63 | .digi_term = "ansi" /* default terminal type */ | |
64 | }; | |
65 | ||
0b99d589 LL |
66 | /* |
67 | * Define a local default termios struct. All ports will be created | |
68 | * with this termios initially. | |
69 | * | |
70 | * This defines a raw port at 9600 baud, 8 data bits, no parity, | |
71 | * 1 stop bit. | |
72 | */ | |
10352c2a | 73 | static struct ktermios DgncDefaultTermios = { |
0b99d589 LL |
74 | .c_iflag = (DEFAULT_IFLAGS), /* iflags */ |
75 | .c_oflag = (DEFAULT_OFLAGS), /* oflags */ | |
76 | .c_cflag = (DEFAULT_CFLAGS), /* cflags */ | |
77 | .c_lflag = (DEFAULT_LFLAGS), /* lflags */ | |
78 | .c_cc = INIT_C_CC, | |
79 | .c_line = 0, | |
80 | }; | |
81 | ||
0b99d589 LL |
82 | /* Our function prototypes */ |
83 | static int dgnc_tty_open(struct tty_struct *tty, struct file *file); | |
84 | static void dgnc_tty_close(struct tty_struct *tty, struct file *file); | |
851f306d CM |
85 | static int dgnc_block_til_ready(struct tty_struct *tty, struct file *file, |
86 | struct channel_t *ch); | |
87 | static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, | |
88 | unsigned long arg); | |
89 | static int dgnc_tty_digigeta(struct tty_struct *tty, | |
90 | struct digi_t __user *retinfo); | |
91 | static int dgnc_tty_digiseta(struct tty_struct *tty, | |
92 | struct digi_t __user *new_info); | |
58b905b3 | 93 | static int dgnc_tty_write_room(struct tty_struct *tty); |
0b99d589 | 94 | static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c); |
58b905b3 | 95 | static int dgnc_tty_chars_in_buffer(struct tty_struct *tty); |
0b99d589 LL |
96 | static void dgnc_tty_start(struct tty_struct *tty); |
97 | static void dgnc_tty_stop(struct tty_struct *tty); | |
98 | static void dgnc_tty_throttle(struct tty_struct *tty); | |
99 | static void dgnc_tty_unthrottle(struct tty_struct *tty); | |
100 | static void dgnc_tty_flush_chars(struct tty_struct *tty); | |
101 | static void dgnc_tty_flush_buffer(struct tty_struct *tty); | |
102 | static void dgnc_tty_hangup(struct tty_struct *tty); | |
c23b48e0 | 103 | static int dgnc_set_modem_info(struct channel_t *ch, unsigned int command, |
851f306d CM |
104 | unsigned int __user *value); |
105 | static int dgnc_get_modem_info(struct channel_t *ch, | |
106 | unsigned int __user *value); | |
0b99d589 | 107 | static int dgnc_tty_tiocmget(struct tty_struct *tty); |
851f306d CM |
108 | static int dgnc_tty_tiocmset(struct tty_struct *tty, unsigned int set, |
109 | unsigned int clear); | |
0b99d589 LL |
110 | static int dgnc_tty_send_break(struct tty_struct *tty, int msec); |
111 | static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout); | |
851f306d CM |
112 | static int dgnc_tty_write(struct tty_struct *tty, const unsigned char *buf, |
113 | int count); | |
114 | static void dgnc_tty_set_termios(struct tty_struct *tty, | |
115 | struct ktermios *old_termios); | |
0b99d589 LL |
116 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char ch); |
117 | ||
0b99d589 LL |
118 | static const struct tty_operations dgnc_tty_ops = { |
119 | .open = dgnc_tty_open, | |
120 | .close = dgnc_tty_close, | |
121 | .write = dgnc_tty_write, | |
122 | .write_room = dgnc_tty_write_room, | |
123 | .flush_buffer = dgnc_tty_flush_buffer, | |
124 | .chars_in_buffer = dgnc_tty_chars_in_buffer, | |
125 | .flush_chars = dgnc_tty_flush_chars, | |
126 | .ioctl = dgnc_tty_ioctl, | |
127 | .set_termios = dgnc_tty_set_termios, | |
128 | .stop = dgnc_tty_stop, | |
129 | .start = dgnc_tty_start, | |
130 | .throttle = dgnc_tty_throttle, | |
131 | .unthrottle = dgnc_tty_unthrottle, | |
132 | .hangup = dgnc_tty_hangup, | |
133 | .put_char = dgnc_tty_put_char, | |
134 | .tiocmget = dgnc_tty_tiocmget, | |
135 | .tiocmset = dgnc_tty_tiocmset, | |
136 | .break_ctl = dgnc_tty_send_break, | |
137 | .wait_until_sent = dgnc_tty_wait_until_sent, | |
138 | .send_xchar = dgnc_tty_send_xchar | |
139 | }; | |
140 | ||
141 | /************************************************************************ | |
8b07d521 | 142 | * |
0b99d589 | 143 | * TTY Initialization/Cleanup Functions |
8b07d521 | 144 | * |
0b99d589 | 145 | ************************************************************************/ |
8b07d521 | 146 | |
0b99d589 LL |
147 | /* |
148 | * dgnc_tty_preinit() | |
149 | * | |
150 | * Initialize any global tty related data before we download any boards. | |
151 | */ | |
152 | int dgnc_tty_preinit(void) | |
153 | { | |
154 | /* | |
155 | * Allocate a buffer for doing the copy from user space to | |
156 | * kernel space in dgnc_write(). We only use one buffer and | |
157 | * control access to it with a semaphore. If we are paging, we | |
158 | * are already in trouble so one buffer won't hurt much anyway. | |
159 | * | |
160 | * We are okay to sleep in the malloc, as this routine | |
161 | * is only called during module load, (not in interrupt context), | |
162 | * and with no locks held. | |
163 | */ | |
164 | dgnc_TmpWriteBuf = kmalloc(WRITEBUFLEN, GFP_KERNEL); | |
165 | ||
f1e51745 | 166 | if (!dgnc_TmpWriteBuf) |
8f90ef80 | 167 | return -ENOMEM; |
0b99d589 | 168 | |
8f90ef80 | 169 | return 0; |
0b99d589 LL |
170 | } |
171 | ||
0b99d589 LL |
172 | /* |
173 | * dgnc_tty_register() | |
174 | * | |
175 | * Init the tty subsystem for this board. | |
176 | */ | |
03425f55 | 177 | int dgnc_tty_register(struct dgnc_board *brd) |
0b99d589 | 178 | { |
60b3109e | 179 | int rc; |
8b07d521 | 180 | |
60b3109e DY |
181 | brd->serial_driver = tty_alloc_driver(brd->maxports, |
182 | TTY_DRIVER_REAL_RAW | | |
183 | TTY_DRIVER_DYNAMIC_DEV | | |
184 | TTY_DRIVER_HARDWARE_BREAK); | |
0b99d589 | 185 | |
60b3109e DY |
186 | if (IS_ERR(brd->serial_driver)) |
187 | return PTR_ERR(brd->serial_driver); | |
0b99d589 | 188 | |
6841b2a0 CM |
189 | snprintf(brd->serial_name, MAXTTYNAMELEN, "tty_dgnc_%d_", |
190 | brd->boardnum); | |
0b99d589 | 191 | |
60b3109e DY |
192 | brd->serial_driver->name = brd->serial_name; |
193 | brd->serial_driver->name_base = 0; | |
194 | brd->serial_driver->major = 0; | |
195 | brd->serial_driver->minor_start = 0; | |
196 | brd->serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
197 | brd->serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
198 | brd->serial_driver->init_termios = DgncDefaultTermios; | |
199 | brd->serial_driver->driver_name = DRVSTR; | |
0b99d589 | 200 | |
0b99d589 LL |
201 | /* |
202 | * Entry points for driver. Called by the kernel from | |
203 | * tty_io.c and n_tty.c. | |
204 | */ | |
60b3109e | 205 | tty_set_operations(brd->serial_driver, &dgnc_tty_ops); |
0b99d589 | 206 | |
a25ad520 | 207 | if (!brd->dgnc_major_serial_registered) { |
0b99d589 | 208 | /* Register tty devices */ |
60b3109e | 209 | rc = tty_register_driver(brd->serial_driver); |
0b99d589 | 210 | if (rc < 0) { |
1f26adc9 RD |
211 | dev_dbg(&brd->pdev->dev, |
212 | "Can't register tty device (%d)\n", rc); | |
60b3109e | 213 | goto free_serial_driver; |
0b99d589 | 214 | } |
a25ad520 | 215 | brd->dgnc_major_serial_registered = true; |
0b99d589 LL |
216 | } |
217 | ||
218 | /* | |
219 | * If we're doing transparent print, we have to do all of the above | |
79e30af2 | 220 | * again, separately so we don't get the LD confused about what major |
0b99d589 LL |
221 | * we are when we get into the dgnc_tty_open() routine. |
222 | */ | |
60b3109e DY |
223 | brd->print_driver = tty_alloc_driver(brd->maxports, |
224 | TTY_DRIVER_REAL_RAW | | |
225 | TTY_DRIVER_DYNAMIC_DEV | | |
226 | TTY_DRIVER_HARDWARE_BREAK); | |
0b99d589 | 227 | |
a0ca97b8 DY |
228 | if (IS_ERR(brd->print_driver)) { |
229 | rc = PTR_ERR(brd->print_driver); | |
230 | goto unregister_serial_driver; | |
231 | } | |
0b99d589 | 232 | |
60b3109e | 233 | snprintf(brd->print_name, MAXTTYNAMELEN, "pr_dgnc_%d_", brd->boardnum); |
0b99d589 | 234 | |
60b3109e DY |
235 | brd->print_driver->name = brd->print_name; |
236 | brd->print_driver->name_base = 0; | |
237 | brd->print_driver->major = brd->serial_driver->major; | |
238 | brd->print_driver->minor_start = 0x80; | |
239 | brd->print_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
240 | brd->print_driver->subtype = SERIAL_TYPE_NORMAL; | |
241 | brd->print_driver->init_termios = DgncDefaultTermios; | |
242 | brd->print_driver->driver_name = DRVSTR; | |
0b99d589 | 243 | |
0b99d589 LL |
244 | /* |
245 | * Entry points for driver. Called by the kernel from | |
246 | * tty_io.c and n_tty.c. | |
247 | */ | |
60b3109e | 248 | tty_set_operations(brd->print_driver, &dgnc_tty_ops); |
0b99d589 | 249 | |
a25ad520 | 250 | if (!brd->dgnc_major_transparent_print_registered) { |
0b99d589 | 251 | /* Register Transparent Print devices */ |
60b3109e | 252 | rc = tty_register_driver(brd->print_driver); |
0b99d589 | 253 | if (rc < 0) { |
1f26adc9 RD |
254 | dev_dbg(&brd->pdev->dev, |
255 | "Can't register Transparent Print device(%d)\n", | |
256 | rc); | |
60b3109e | 257 | goto free_print_driver; |
0b99d589 | 258 | } |
a25ad520 | 259 | brd->dgnc_major_transparent_print_registered = true; |
0b99d589 LL |
260 | } |
261 | ||
60b3109e DY |
262 | dgnc_BoardsByMajor[brd->serial_driver->major] = brd; |
263 | ||
264 | return 0; | |
265 | ||
266 | free_print_driver: | |
267 | put_tty_driver(brd->print_driver); | |
268 | unregister_serial_driver: | |
269 | tty_unregister_driver(brd->serial_driver); | |
270 | free_serial_driver: | |
271 | put_tty_driver(brd->serial_driver); | |
0b99d589 | 272 | |
8f90ef80 | 273 | return rc; |
0b99d589 LL |
274 | } |
275 | ||
eea5fd11 DY |
276 | void dgnc_tty_unregister(struct dgnc_board *brd) |
277 | { | |
278 | tty_unregister_driver(brd->print_driver); | |
279 | tty_unregister_driver(brd->serial_driver); | |
280 | put_tty_driver(brd->print_driver); | |
281 | put_tty_driver(brd->serial_driver); | |
282 | } | |
283 | ||
0b99d589 LL |
284 | /* |
285 | * dgnc_tty_init() | |
286 | * | |
287 | * Init the tty subsystem. Called once per board after board has been | |
288 | * downloaded and init'ed. | |
289 | */ | |
03425f55 | 290 | int dgnc_tty_init(struct dgnc_board *brd) |
0b99d589 LL |
291 | { |
292 | int i; | |
a7a75386 | 293 | void __iomem *vaddr; |
0b99d589 LL |
294 | struct channel_t *ch; |
295 | ||
296 | if (!brd) | |
8f90ef80 | 297 | return -ENXIO; |
0b99d589 | 298 | |
0b99d589 LL |
299 | /* |
300 | * Initialize board structure elements. | |
301 | */ | |
302 | ||
303 | vaddr = brd->re_map_membase; | |
304 | ||
305 | brd->nasync = brd->maxports; | |
306 | ||
0b99d589 | 307 | for (i = 0; i < brd->nasync; i++) { |
fa52d96c GS |
308 | /* |
309 | * Okay to malloc with GFP_KERNEL, we are not at | |
310 | * interrupt context, and there are no locks held. | |
311 | */ | |
312 | brd->channels[i] = kzalloc(sizeof(*brd->channels[i]), | |
313 | GFP_KERNEL); | |
314 | if (!brd->channels[i]) | |
315 | goto err_free_channels; | |
0b99d589 LL |
316 | } |
317 | ||
318 | ch = brd->channels[0]; | |
319 | vaddr = brd->re_map_membase; | |
320 | ||
321 | /* Set up channel variables */ | |
322 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
a44b508a | 323 | spin_lock_init(&ch->ch_lock); |
0b99d589 LL |
324 | |
325 | /* Store all our magic numbers */ | |
326 | ch->magic = DGNC_CHANNEL_MAGIC; | |
327 | ch->ch_tun.magic = DGNC_UNIT_MAGIC; | |
328 | ch->ch_tun.un_ch = ch; | |
329 | ch->ch_tun.un_type = DGNC_SERIAL; | |
330 | ch->ch_tun.un_dev = i; | |
331 | ||
332 | ch->ch_pun.magic = DGNC_UNIT_MAGIC; | |
333 | ch->ch_pun.un_ch = ch; | |
334 | ch->ch_pun.un_type = DGNC_PRINT; | |
335 | ch->ch_pun.un_dev = i + 128; | |
336 | ||
337 | if (brd->bd_uart_offset == 0x200) | |
a7a75386 | 338 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 | 339 | else |
a7a75386 | 340 | ch->ch_cls_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 LL |
341 | |
342 | ch->ch_bd = brd; | |
343 | ch->ch_portnum = i; | |
344 | ch->ch_digi = dgnc_digi_init; | |
345 | ||
346 | /* .25 second delay */ | |
347 | ch->ch_close_delay = 250; | |
348 | ||
349 | init_waitqueue_head(&ch->ch_flags_wait); | |
350 | init_waitqueue_head(&ch->ch_tun.un_flags_wait); | |
351 | init_waitqueue_head(&ch->ch_pun.un_flags_wait); | |
0b99d589 LL |
352 | |
353 | { | |
354 | struct device *classp; | |
0eaa02e6 | 355 | |
60b3109e | 356 | classp = tty_register_device(brd->serial_driver, i, |
7df227c4 | 357 | &ch->ch_bd->pdev->dev); |
0b99d589 LL |
358 | ch->ch_tun.un_sysfs = classp; |
359 | dgnc_create_tty_sysfs(&ch->ch_tun, classp); | |
360 | ||
60b3109e | 361 | classp = tty_register_device(brd->print_driver, i, |
7df227c4 | 362 | &ch->ch_bd->pdev->dev); |
0b99d589 LL |
363 | ch->ch_pun.un_sysfs = classp; |
364 | dgnc_create_tty_sysfs(&ch->ch_pun, classp); | |
365 | } | |
0b99d589 LL |
366 | } |
367 | ||
8f90ef80 | 368 | return 0; |
fa52d96c GS |
369 | |
370 | err_free_channels: | |
371 | for (i = i - 1; i >= 0; --i) { | |
372 | kfree(brd->channels[i]); | |
373 | brd->channels[i] = NULL; | |
374 | } | |
375 | return -ENOMEM; | |
0b99d589 LL |
376 | } |
377 | ||
0b99d589 LL |
378 | /* |
379 | * dgnc_tty_post_uninit() | |
380 | * | |
381 | * UnInitialize any global tty related data. | |
382 | */ | |
383 | void dgnc_tty_post_uninit(void) | |
384 | { | |
5b4af85e DY |
385 | kfree(dgnc_TmpWriteBuf); |
386 | dgnc_TmpWriteBuf = NULL; | |
0b99d589 LL |
387 | } |
388 | ||
0b99d589 LL |
389 | /* |
390 | * dgnc_tty_uninit() | |
391 | * | |
392 | * Uninitialize the TTY portion of this driver. Free all memory and | |
8b07d521 | 393 | * resources. |
0b99d589 | 394 | */ |
03425f55 | 395 | void dgnc_tty_uninit(struct dgnc_board *brd) |
0b99d589 LL |
396 | { |
397 | int i = 0; | |
398 | ||
a25ad520 | 399 | if (brd->dgnc_major_serial_registered) { |
60b3109e | 400 | dgnc_BoardsByMajor[brd->serial_driver->major] = NULL; |
0b99d589 | 401 | for (i = 0; i < brd->nasync; i++) { |
ce2927e9 GS |
402 | if (brd->channels[i]) |
403 | dgnc_remove_tty_sysfs(brd->channels[i]-> | |
404 | ch_tun.un_sysfs); | |
60b3109e | 405 | tty_unregister_device(brd->serial_driver, i); |
0b99d589 | 406 | } |
60b3109e | 407 | tty_unregister_driver(brd->serial_driver); |
a25ad520 | 408 | brd->dgnc_major_serial_registered = false; |
0b99d589 LL |
409 | } |
410 | ||
a25ad520 | 411 | if (brd->dgnc_major_transparent_print_registered) { |
60b3109e | 412 | dgnc_BoardsByMajor[brd->print_driver->major] = NULL; |
0b99d589 | 413 | for (i = 0; i < brd->nasync; i++) { |
ce2927e9 GS |
414 | if (brd->channels[i]) |
415 | dgnc_remove_tty_sysfs(brd->channels[i]-> | |
416 | ch_pun.un_sysfs); | |
60b3109e | 417 | tty_unregister_device(brd->print_driver, i); |
0b99d589 | 418 | } |
60b3109e | 419 | tty_unregister_driver(brd->print_driver); |
a25ad520 | 420 | brd->dgnc_major_transparent_print_registered = false; |
0b99d589 LL |
421 | } |
422 | ||
60b3109e DY |
423 | put_tty_driver(brd->serial_driver); |
424 | put_tty_driver(brd->print_driver); | |
0b99d589 LL |
425 | } |
426 | ||
8e8d27f7 | 427 | /* |
0b99d589 LL |
428 | * dgnc_wmove - Write data to transmit queue. |
429 | * | |
430 | * ch - Pointer to channel structure. | |
f7f2b10a | 431 | * buf - Pointer to characters to be moved. |
0b99d589 | 432 | * n - Number of characters to move. |
8e8d27f7 | 433 | */ |
0b99d589 LL |
434 | static void dgnc_wmove(struct channel_t *ch, char *buf, uint n) |
435 | { | |
436 | int remain; | |
437 | uint head; | |
438 | ||
439 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
440 | return; | |
8b07d521 | 441 | |
0b99d589 LL |
442 | head = ch->ch_w_head & WQUEUEMASK; |
443 | ||
444 | /* | |
445 | * If the write wraps over the top of the circular buffer, | |
446 | * move the portion up to the wrap point, and reset the | |
447 | * pointers to the bottom. | |
448 | */ | |
449 | remain = WQUEUESIZE - head; | |
450 | ||
451 | if (n >= remain) { | |
8b07d521 | 452 | n -= remain; |
0b99d589 LL |
453 | memcpy(ch->ch_wqueue + head, buf, remain); |
454 | head = 0; | |
455 | buf += remain; | |
456 | } | |
457 | ||
458 | if (n > 0) { | |
459 | /* | |
460 | * Move rest of data. | |
461 | */ | |
462 | remain = n; | |
463 | memcpy(ch->ch_wqueue + head, buf, remain); | |
464 | head += remain; | |
465 | } | |
466 | ||
467 | head &= WQUEUEMASK; | |
468 | ch->ch_w_head = head; | |
469 | } | |
470 | ||
8e8d27f7 | 471 | /* |
0b99d589 | 472 | * dgnc_input - Process received data. |
8b07d521 | 473 | * |
90d2a471 | 474 | * ch - Pointer to channel structure. |
8e8d27f7 | 475 | */ |
0b99d589 LL |
476 | void dgnc_input(struct channel_t *ch) |
477 | { | |
03425f55 | 478 | struct dgnc_board *bd; |
0b99d589 | 479 | struct tty_struct *tp; |
c84a083b | 480 | struct tty_ldisc *ld = NULL; |
0b99d589 LL |
481 | uint rmask; |
482 | ushort head; | |
483 | ushort tail; | |
484 | int data_len; | |
a44b508a | 485 | unsigned long flags; |
0b99d589 LL |
486 | int flip_len; |
487 | int len = 0; | |
488 | int n = 0; | |
0b99d589 LL |
489 | int s = 0; |
490 | int i = 0; | |
491 | ||
492 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
493 | return; | |
494 | ||
495 | tp = ch->ch_tun.un_tty; | |
496 | ||
497 | bd = ch->ch_bd; | |
a82477c3 | 498 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
0b99d589 LL |
499 | return; |
500 | ||
a44b508a | 501 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 502 | |
8b07d521 LL |
503 | /* |
504 | * Figure the number of characters in the buffer. | |
0b99d589 LL |
505 | * Exit immediately if none. |
506 | */ | |
507 | rmask = RQUEUEMASK; | |
508 | head = ch->ch_r_head & rmask; | |
509 | tail = ch->ch_r_tail & rmask; | |
510 | data_len = (head - tail) & rmask; | |
511 | ||
c84a083b QL |
512 | if (data_len == 0) |
513 | goto exit_unlock; | |
0b99d589 | 514 | |
0b99d589 LL |
515 | /* |
516 | * If the device is not open, or CREAD is off, | |
90d2a471 | 517 | * flush input data and return immediately. |
0b99d589 | 518 | */ |
851f306d CM |
519 | if (!tp || (tp->magic != TTY_MAGIC) || |
520 | !(ch->ch_tun.un_flags & UN_ISOPEN) || | |
9db276f8 | 521 | !C_CREAD(tp) || |
851f306d | 522 | (ch->ch_tun.un_flags & UN_CLOSING)) { |
0b99d589 LL |
523 | ch->ch_r_head = tail; |
524 | ||
525 | /* Force queue flow control to be released, if needed */ | |
526 | dgnc_check_queue_flow_control(ch); | |
527 | ||
c84a083b | 528 | goto exit_unlock; |
0b99d589 LL |
529 | } |
530 | ||
531 | /* | |
532 | * If we are throttled, simply don't read any data. | |
533 | */ | |
c84a083b QL |
534 | if (ch->ch_flags & CH_FORCED_STOPI) |
535 | goto exit_unlock; | |
0b99d589 | 536 | |
100013fa | 537 | flip_len = TTY_FLIPBUF_SIZE; |
0b99d589 LL |
538 | |
539 | /* Chop down the length, if needed */ | |
540 | len = min(data_len, flip_len); | |
100013fa | 541 | len = min(len, (N_TTY_BUF_SIZE - 1)); |
0b99d589 LL |
542 | |
543 | ld = tty_ldisc_ref(tp); | |
544 | ||
0b99d589 LL |
545 | /* |
546 | * If we were unable to get a reference to the ld, | |
547 | * don't flush our buffer, and act like the ld doesn't | |
548 | * have any space to put the data right now. | |
549 | */ | |
550 | if (!ld) { | |
551 | len = 0; | |
552 | } else { | |
553 | /* | |
554 | * If ld doesn't have a pointer to a receive_buf function, | |
555 | * flush the data, then act like the ld doesn't have any | |
556 | * space to put the data right now. | |
557 | */ | |
558 | if (!ld->ops->receive_buf) { | |
559 | ch->ch_r_head = ch->ch_r_tail; | |
560 | len = 0; | |
8b07d521 | 561 | } |
0b99d589 LL |
562 | } |
563 | ||
c84a083b QL |
564 | if (len <= 0) |
565 | goto exit_unlock; | |
0b99d589 LL |
566 | |
567 | /* | |
568 | * The tty layer in the kernel has changed in 2.6.16+. | |
569 | * | |
570 | * The flip buffers in the tty structure are no longer exposed, | |
571 | * and probably will be going away eventually. | |
8b07d521 | 572 | * |
0b99d589 LL |
573 | * If we are completely raw, we don't need to go through a lot |
574 | * of the tty layers that exist. | |
575 | * In this case, we take the shortest and fastest route we | |
576 | * can to relay the data to the user. | |
577 | * | |
578 | * On the other hand, if we are not raw, we need to go through | |
579 | * the new 2.6.16+ tty layer, which has its API more well defined. | |
580 | */ | |
100013fa LL |
581 | len = tty_buffer_request_room(tp->port, len); |
582 | n = len; | |
0b99d589 | 583 | |
100013fa LL |
584 | /* |
585 | * n now contains the most amount of data we can copy, | |
586 | * bounded either by how much the Linux tty layer can handle, | |
587 | * or the amount of data the card actually has pending... | |
588 | */ | |
589 | while (n) { | |
56d118c2 DY |
590 | unsigned char *ch_pos = ch->ch_equeue + tail; |
591 | ||
100013fa LL |
592 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; |
593 | s = min(s, n); | |
0b99d589 | 594 | |
100013fa LL |
595 | if (s <= 0) |
596 | break; | |
0b99d589 LL |
597 | |
598 | /* | |
8b07d521 | 599 | * If conditions are such that ld needs to see all |
100013fa LL |
600 | * UART errors, we will have to walk each character |
601 | * and error byte and send them to the buffer one at | |
602 | * a time. | |
0b99d589 | 603 | */ |
100013fa LL |
604 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
605 | for (i = 0; i < s; i++) { | |
56d118c2 DY |
606 | unsigned char ch = *(ch_pos + i); |
607 | char flag = TTY_NORMAL; | |
608 | ||
609 | if (ch & UART_LSR_BI) | |
610 | flag = TTY_BREAK; | |
611 | else if (ch & UART_LSR_PE) | |
612 | flag = TTY_PARITY; | |
613 | else if (ch & UART_LSR_FE) | |
614 | flag = TTY_FRAME; | |
615 | ||
616 | tty_insert_flip_char(tp->port, ch, flag); | |
100013fa | 617 | } |
2000c581 | 618 | } else { |
56d118c2 | 619 | tty_insert_flip_string(tp->port, ch_pos, s); |
0b99d589 LL |
620 | } |
621 | ||
100013fa LL |
622 | tail += s; |
623 | n -= s; | |
624 | /* Flip queue if needed */ | |
625 | tail &= rmask; | |
0b99d589 | 626 | } |
0b99d589 | 627 | |
100013fa LL |
628 | ch->ch_r_tail = tail & rmask; |
629 | ch->ch_e_tail = tail & rmask; | |
630 | dgnc_check_queue_flow_control(ch); | |
a44b508a | 631 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 632 | |
100013fa LL |
633 | /* Tell the tty layer its okay to "eat" the data now */ |
634 | tty_flip_buffer_push(tp->port); | |
0b99d589 LL |
635 | |
636 | if (ld) | |
637 | tty_ldisc_deref(ld); | |
c84a083b QL |
638 | return; |
639 | ||
640 | exit_unlock: | |
5ec29365 | 641 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
c84a083b QL |
642 | if (ld) |
643 | tty_ldisc_deref(ld); | |
0b99d589 LL |
644 | } |
645 | ||
8b07d521 | 646 | /************************************************************************ |
0b99d589 | 647 | * Determines when CARRIER changes state and takes appropriate |
8b07d521 | 648 | * action. |
0b99d589 LL |
649 | ************************************************************************/ |
650 | void dgnc_carrier(struct channel_t *ch) | |
651 | { | |
90d2a471 LL |
652 | int virt_carrier = 0; |
653 | int phys_carrier = 0; | |
8b07d521 | 654 | |
0b99d589 LL |
655 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
656 | return; | |
657 | ||
f1e51745 | 658 | if (ch->ch_mistat & UART_MSR_DCD) |
0b99d589 | 659 | phys_carrier = 1; |
0b99d589 | 660 | |
50667c67 | 661 | if (ch->ch_digi.digi_flags & DIGI_FORCEDCD) |
0b99d589 | 662 | virt_carrier = 1; |
0b99d589 | 663 | |
50667c67 | 664 | if (ch->ch_c_cflag & CLOCAL) |
0b99d589 | 665 | virt_carrier = 1; |
0b99d589 | 666 | |
0b99d589 LL |
667 | /* |
668 | * Test for a VIRTUAL carrier transition to HIGH. | |
669 | */ | |
670 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
0b99d589 LL |
671 | /* |
672 | * When carrier rises, wake any threads waiting | |
673 | * for carrier in the open routine. | |
674 | */ | |
675 | ||
7df227c4 | 676 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
677 | wake_up_interruptible(&ch->ch_flags_wait); |
678 | } | |
679 | ||
680 | /* | |
681 | * Test for a PHYSICAL carrier transition to HIGH. | |
682 | */ | |
683 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
0b99d589 LL |
684 | /* |
685 | * When carrier rises, wake any threads waiting | |
686 | * for carrier in the open routine. | |
687 | */ | |
688 | ||
7df227c4 | 689 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
690 | wake_up_interruptible(&ch->ch_flags_wait); |
691 | } | |
692 | ||
693 | /* | |
694 | * Test for a PHYSICAL transition to low, so long as we aren't | |
695 | * currently ignoring physical transitions (which is what "virtual | |
696 | * carrier" indicates). | |
697 | * | |
698 | * The transition of the virtual carrier to low really doesn't | |
699 | * matter... it really only means "ignore carrier state", not | |
700 | * "make pretend that carrier is there". | |
701 | */ | |
702 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) && | |
10352c2a | 703 | (phys_carrier == 0)) { |
0b99d589 LL |
704 | /* |
705 | * When carrier drops: | |
706 | * | |
707 | * Drop carrier on all open units. | |
708 | * | |
709 | * Flush queues, waking up any task waiting in the | |
710 | * line discipline. | |
711 | * | |
712 | * Send a hangup to the control terminal. | |
713 | * | |
714 | * Enable all select calls. | |
715 | */ | |
7df227c4 | 716 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
717 | wake_up_interruptible(&ch->ch_flags_wait); |
718 | ||
f1e51745 | 719 | if (ch->ch_tun.un_open_count > 0) |
0b99d589 | 720 | tty_hangup(ch->ch_tun.un_tty); |
0b99d589 | 721 | |
f1e51745 | 722 | if (ch->ch_pun.un_open_count > 0) |
0b99d589 | 723 | tty_hangup(ch->ch_pun.un_tty); |
0b99d589 LL |
724 | } |
725 | ||
726 | /* | |
727 | * Make sure that our cached values reflect the current reality. | |
728 | */ | |
729 | if (virt_carrier == 1) | |
730 | ch->ch_flags |= CH_FCAR; | |
8b07d521 | 731 | else |
0b99d589 LL |
732 | ch->ch_flags &= ~CH_FCAR; |
733 | ||
734 | if (phys_carrier == 1) | |
735 | ch->ch_flags |= CH_CD; | |
736 | else | |
737 | ch->ch_flags &= ~CH_CD; | |
738 | } | |
739 | ||
740 | /* | |
741 | * Assign the custom baud rate to the channel structure | |
742 | */ | |
743 | static void dgnc_set_custom_speed(struct channel_t *ch, uint newrate) | |
744 | { | |
745 | int testdiv; | |
746 | int testrate_high; | |
8b07d521 | 747 | int testrate_low; |
0b99d589 LL |
748 | int deltahigh; |
749 | int deltalow; | |
750 | ||
93c76c9c DY |
751 | if (newrate <= 0) { |
752 | ch->ch_custom_speed = 0; | |
753 | return; | |
754 | } | |
0b99d589 LL |
755 | |
756 | /* | |
757 | * Since the divisor is stored in a 16-bit integer, we make sure | |
758 | * we don't allow any rates smaller than a 16-bit integer would allow. | |
759 | * And of course, rates above the dividend won't fly. | |
760 | */ | |
761 | if (newrate && newrate < ((ch->ch_bd->bd_dividend / 0xFFFF) + 1)) | |
0b7ceaa6 | 762 | newrate = (ch->ch_bd->bd_dividend / 0xFFFF) + 1; |
0b99d589 LL |
763 | |
764 | if (newrate && newrate > ch->ch_bd->bd_dividend) | |
90d2a471 | 765 | newrate = ch->ch_bd->bd_dividend; |
0b99d589 | 766 | |
93c76c9c | 767 | if (newrate > 0) { |
0b99d589 LL |
768 | testdiv = ch->ch_bd->bd_dividend / newrate; |
769 | ||
770 | /* | |
771 | * If we try to figure out what rate the board would use | |
772 | * with the test divisor, it will be either equal or higher | |
773 | * than the requested baud rate. If we then determine the | |
8b07d521 | 774 | * rate with a divisor one higher, we will get the next lower |
0b99d589 LL |
775 | * supported rate below the requested. |
776 | */ | |
777 | testrate_high = ch->ch_bd->bd_dividend / testdiv; | |
778 | testrate_low = ch->ch_bd->bd_dividend / (testdiv + 1); | |
779 | ||
780 | /* | |
781 | * If the rate for the requested divisor is correct, just | |
782 | * use it and be done. | |
783 | */ | |
93c76c9c DY |
784 | if (testrate_high != newrate) { |
785 | /* | |
851f306d CM |
786 | * Otherwise, pick the rate that is closer |
787 | * (i.e. whichever rate has a smaller delta). | |
93c76c9c DY |
788 | */ |
789 | deltahigh = testrate_high - newrate; | |
790 | deltalow = newrate - testrate_low; | |
0b99d589 | 791 | |
50667c67 | 792 | if (deltahigh < deltalow) |
93c76c9c | 793 | newrate = testrate_high; |
50667c67 | 794 | else |
93c76c9c | 795 | newrate = testrate_low; |
0b99d589 | 796 | } |
0b99d589 | 797 | } |
8b07d521 | 798 | |
0b99d589 | 799 | ch->ch_custom_speed = newrate; |
0b99d589 LL |
800 | } |
801 | ||
0b99d589 LL |
802 | void dgnc_check_queue_flow_control(struct channel_t *ch) |
803 | { | |
d09c1b96 | 804 | int qleft; |
0b99d589 LL |
805 | |
806 | /* Store how much space we have left in the queue */ | |
f7c851d4 CP |
807 | qleft = ch->ch_r_tail - ch->ch_r_head - 1; |
808 | if (qleft < 0) | |
0b99d589 LL |
809 | qleft += RQUEUEMASK + 1; |
810 | ||
811 | /* | |
812 | * Check to see if we should enforce flow control on our queue because | |
813 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
814 | * | |
815 | * NOTE: This is done based on what the current flow control of the | |
816 | * port is set for. | |
817 | * | |
818 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
819 | * This will cause the UART's FIFO to back up, and force | |
820 | * the RTS signal to be dropped. | |
821 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
822 | * the other side, in hopes it will stop sending data to us. | |
823 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
824 | * that gets sent into us when the queue fills up. | |
825 | */ | |
826 | if (qleft < 256) { | |
827 | /* HWFLOW */ | |
851f306d CM |
828 | if (ch->ch_digi.digi_flags & CTSPACE || |
829 | ch->ch_c_cflag & CRTSCTS) { | |
a82477c3 | 830 | if (!(ch->ch_flags & CH_RECEIVER_OFF)) { |
0b99d589 LL |
831 | ch->ch_bd->bd_ops->disable_receiver(ch); |
832 | ch->ch_flags |= (CH_RECEIVER_OFF); | |
0b99d589 LL |
833 | } |
834 | } | |
835 | /* SWFLOW */ | |
836 | else if (ch->ch_c_iflag & IXOFF) { | |
837 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
838 | ch->ch_bd->bd_ops->send_stop_character(ch); | |
839 | ch->ch_stops_sent++; | |
0b99d589 LL |
840 | } |
841 | } | |
0b99d589 LL |
842 | } |
843 | ||
844 | /* | |
845 | * Check to see if we should unenforce flow control because | |
846 | * ld (or user) finally read enuf data out of our queue. | |
847 | * | |
848 | * NOTE: This is done based on what the current flow control of the | |
849 | * port is set for. | |
850 | * | |
851 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
852 | * This will cause the UART's FIFO to raise RTS back up, | |
853 | * which will allow the other side to start sending data again. | |
854 | * 2) SWFLOW (IXOFF) - Send a start character to | |
855 | * the other side, so it will start sending data to us again. | |
856 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
857 | * other side, we don't need to do anything now. | |
858 | */ | |
859 | if (qleft > (RQUEUESIZE / 2)) { | |
860 | /* HWFLOW */ | |
851f306d CM |
861 | if (ch->ch_digi.digi_flags & RTSPACE || |
862 | ch->ch_c_cflag & CRTSCTS) { | |
0b99d589 LL |
863 | if (ch->ch_flags & CH_RECEIVER_OFF) { |
864 | ch->ch_bd->bd_ops->enable_receiver(ch); | |
865 | ch->ch_flags &= ~(CH_RECEIVER_OFF); | |
0b99d589 LL |
866 | } |
867 | } | |
868 | /* SWFLOW */ | |
869 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
870 | ch->ch_stops_sent = 0; | |
871 | ch->ch_bd->bd_ops->send_start_character(ch); | |
0b99d589 | 872 | } |
0b99d589 LL |
873 | } |
874 | } | |
875 | ||
0b99d589 LL |
876 | void dgnc_wakeup_writes(struct channel_t *ch) |
877 | { | |
878 | int qlen = 0; | |
a44b508a | 879 | unsigned long flags; |
0b99d589 LL |
880 | |
881 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
882 | return; | |
883 | ||
a44b508a | 884 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
885 | |
886 | /* | |
887 | * If channel now has space, wake up anyone waiting on the condition. | |
888 | */ | |
f7c851d4 CP |
889 | qlen = ch->ch_w_head - ch->ch_w_tail; |
890 | if (qlen < 0) | |
90d2a471 | 891 | qlen += WQUEUESIZE; |
0b99d589 LL |
892 | |
893 | if (qlen >= (WQUEUESIZE - 256)) { | |
a44b508a | 894 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
895 | return; |
896 | } | |
897 | ||
898 | if (ch->ch_tun.un_flags & UN_ISOPEN) { | |
6aa56785 | 899 | tty_wakeup(ch->ch_tun.un_tty); |
0b99d589 LL |
900 | |
901 | /* | |
902 | * If unit is set to wait until empty, check to make sure | |
903 | * the queue AND FIFO are both empty. | |
904 | */ | |
905 | if (ch->ch_tun.un_flags & UN_EMPTY) { | |
851f306d | 906 | if ((qlen == 0) && |
e352d3f1 | 907 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) { |
0b99d589 LL |
908 | ch->ch_tun.un_flags &= ~(UN_EMPTY); |
909 | ||
910 | /* | |
911 | * If RTS Toggle mode is on, whenever | |
912 | * the queue and UART is empty, keep RTS low. | |
913 | */ | |
914 | if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) { | |
915 | ch->ch_mostat &= ~(UART_MCR_RTS); | |
916 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
917 | } | |
918 | ||
919 | /* | |
920 | * If DTR Toggle mode is on, whenever | |
921 | * the queue and UART is empty, keep DTR low. | |
922 | */ | |
923 | if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) { | |
924 | ch->ch_mostat &= ~(UART_MCR_DTR); | |
925 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
926 | } | |
927 | } | |
928 | } | |
929 | ||
930 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); | |
931 | } | |
932 | ||
933 | if (ch->ch_pun.un_flags & UN_ISOPEN) { | |
6aa56785 | 934 | tty_wakeup(ch->ch_pun.un_tty); |
0b99d589 LL |
935 | |
936 | /* | |
937 | * If unit is set to wait until empty, check to make sure | |
938 | * the queue AND FIFO are both empty. | |
939 | */ | |
940 | if (ch->ch_pun.un_flags & UN_EMPTY) { | |
851f306d CM |
941 | if ((qlen == 0) && |
942 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) | |
0b99d589 | 943 | ch->ch_pun.un_flags &= ~(UN_EMPTY); |
0b99d589 LL |
944 | } |
945 | ||
946 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); | |
947 | } | |
948 | ||
a44b508a | 949 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
950 | } |
951 | ||
0b99d589 | 952 | /************************************************************************ |
8b07d521 | 953 | * |
0b99d589 | 954 | * TTY Entry points and helper functions |
8b07d521 | 955 | * |
0b99d589 LL |
956 | ************************************************************************/ |
957 | ||
958 | /* | |
959 | * dgnc_tty_open() | |
960 | * | |
961 | */ | |
962 | static int dgnc_tty_open(struct tty_struct *tty, struct file *file) | |
963 | { | |
03425f55 | 964 | struct dgnc_board *brd; |
0b99d589 LL |
965 | struct channel_t *ch; |
966 | struct un_t *un; | |
967 | uint major = 0; | |
968 | uint minor = 0; | |
969 | int rc = 0; | |
a44b508a | 970 | unsigned long flags; |
0b99d589 LL |
971 | |
972 | rc = 0; | |
973 | ||
974 | major = MAJOR(tty_devnum(tty)); | |
975 | minor = MINOR(tty_devnum(tty)); | |
976 | ||
50667c67 | 977 | if (major > 255) |
0b99d589 | 978 | return -ENXIO; |
0b99d589 LL |
979 | |
980 | /* Get board pointer from our array of majors we have allocated */ | |
981 | brd = dgnc_BoardsByMajor[major]; | |
50667c67 | 982 | if (!brd) |
0b99d589 | 983 | return -ENXIO; |
0b99d589 LL |
984 | |
985 | /* | |
986 | * If board is not yet up to a state of READY, go to | |
987 | * sleep waiting for it to happen or they cancel the open. | |
988 | */ | |
989 | rc = wait_event_interruptible(brd->state_wait, | |
e352d3f1 | 990 | (brd->state & BOARD_READY)); |
0b99d589 | 991 | |
50667c67 | 992 | if (rc) |
0b99d589 | 993 | return rc; |
0b99d589 | 994 | |
a44b508a | 995 | spin_lock_irqsave(&brd->bd_lock, flags); |
0b99d589 LL |
996 | |
997 | /* If opened device is greater than our number of ports, bail. */ | |
4bef52f3 | 998 | if (PORT_NUM(minor) >= brd->nasync) { |
a44b508a | 999 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1000 | return -ENXIO; |
1001 | } | |
1002 | ||
1003 | ch = brd->channels[PORT_NUM(minor)]; | |
1004 | if (!ch) { | |
a44b508a | 1005 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1006 | return -ENXIO; |
1007 | } | |
1008 | ||
1009 | /* Drop board lock */ | |
a44b508a | 1010 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1011 | |
1012 | /* Grab channel lock */ | |
a44b508a | 1013 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1014 | |
1015 | /* Figure out our type */ | |
1016 | if (!IS_PRINT(minor)) { | |
1017 | un = &brd->channels[PORT_NUM(minor)]->ch_tun; | |
1018 | un->un_type = DGNC_SERIAL; | |
2000c581 | 1019 | } else if (IS_PRINT(minor)) { |
0b99d589 LL |
1020 | un = &brd->channels[PORT_NUM(minor)]->ch_pun; |
1021 | un->un_type = DGNC_PRINT; | |
2000c581 | 1022 | } else { |
a44b508a | 1023 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1024 | return -ENXIO; |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * If the port is still in a previous open, and in a state | |
1029 | * where we simply cannot safely keep going, wait until the | |
1030 | * state clears. | |
1031 | */ | |
a44b508a | 1032 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1033 | |
851f306d CM |
1034 | rc = wait_event_interruptible(ch->ch_flags_wait, |
1035 | ((ch->ch_flags & CH_OPENING) == 0)); | |
0b99d589 LL |
1036 | |
1037 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 1038 | if (rc) |
0b99d589 | 1039 | return -EINTR; |
0b99d589 LL |
1040 | |
1041 | /* | |
1042 | * If either unit is in the middle of the fragile part of close, | |
1043 | * we just cannot touch the channel safely. | |
1044 | * Go to sleep, knowing that when the channel can be | |
1045 | * touched safely, the close routine will signal the | |
1046 | * ch_flags_wait to wake us back up. | |
1047 | */ | |
1048 | rc = wait_event_interruptible(ch->ch_flags_wait, | |
851f306d CM |
1049 | (((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & |
1050 | UN_CLOSING) == 0)); | |
0b99d589 LL |
1051 | |
1052 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 1053 | if (rc) |
0b99d589 | 1054 | return -EINTR; |
0b99d589 | 1055 | |
a44b508a | 1056 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1057 | |
0b99d589 LL |
1058 | /* Store our unit into driver_data, so we always have it available. */ |
1059 | tty->driver_data = un; | |
1060 | ||
0b99d589 LL |
1061 | /* |
1062 | * Initialize tty's | |
1063 | */ | |
1064 | if (!(un->un_flags & UN_ISOPEN)) { | |
1065 | /* Store important variables. */ | |
1066 | un->un_tty = tty; | |
1067 | ||
1068 | /* Maybe do something here to the TTY struct as well? */ | |
1069 | } | |
1070 | ||
0b99d589 LL |
1071 | /* |
1072 | * Allocate channel buffers for read/write/error. | |
1073 | * Set flag, so we don't get trounced on. | |
1074 | */ | |
1075 | ch->ch_flags |= (CH_OPENING); | |
1076 | ||
1077 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
a44b508a | 1078 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1079 | |
1080 | if (!ch->ch_rqueue) | |
52f9d668 | 1081 | ch->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1082 | if (!ch->ch_equeue) |
52f9d668 | 1083 | ch->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1084 | if (!ch->ch_wqueue) |
52f9d668 | 1085 | ch->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1086 | |
16f10a82 DY |
1087 | if (!ch->ch_rqueue || !ch->ch_equeue || !ch->ch_wqueue) { |
1088 | kfree(ch->ch_rqueue); | |
1089 | kfree(ch->ch_equeue); | |
1090 | kfree(ch->ch_wqueue); | |
1091 | ||
1092 | return -ENOMEM; | |
1093 | } | |
1094 | ||
a44b508a | 1095 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1096 | |
1097 | ch->ch_flags &= ~(CH_OPENING); | |
1098 | wake_up_interruptible(&ch->ch_flags_wait); | |
1099 | ||
1100 | /* | |
1101 | * Initialize if neither terminal or printer is open. | |
1102 | */ | |
1103 | if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_ISOPEN)) { | |
0b99d589 LL |
1104 | /* |
1105 | * Flush input queues. | |
1106 | */ | |
587abd7b SL |
1107 | ch->ch_r_head = 0; |
1108 | ch->ch_r_tail = 0; | |
1109 | ch->ch_e_head = 0; | |
1110 | ch->ch_e_tail = 0; | |
1111 | ch->ch_w_head = 0; | |
1112 | ch->ch_w_tail = 0; | |
0b99d589 LL |
1113 | |
1114 | brd->bd_ops->flush_uart_write(ch); | |
1115 | brd->bd_ops->flush_uart_read(ch); | |
1116 | ||
1117 | ch->ch_flags = 0; | |
1118 | ch->ch_cached_lsr = 0; | |
1119 | ch->ch_stop_sending_break = 0; | |
1120 | ch->ch_stops_sent = 0; | |
1121 | ||
22e3de76 LL |
1122 | ch->ch_c_cflag = tty->termios.c_cflag; |
1123 | ch->ch_c_iflag = tty->termios.c_iflag; | |
1124 | ch->ch_c_oflag = tty->termios.c_oflag; | |
1125 | ch->ch_c_lflag = tty->termios.c_lflag; | |
1126 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
1127 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
1128 | |
1129 | /* | |
1130 | * Bring up RTS and DTR... | |
1131 | * Also handle RTS or DTR toggle if set. | |
1132 | */ | |
1133 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
1134 | ch->ch_mostat |= (UART_MCR_RTS); | |
1135 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
1136 | ch->ch_mostat |= (UART_MCR_DTR); | |
1137 | ||
1138 | /* Tell UART to init itself */ | |
1139 | brd->bd_ops->uart_init(ch); | |
1140 | } | |
1141 | ||
1142 | /* | |
1143 | * Run param in case we changed anything | |
1144 | */ | |
1145 | brd->bd_ops->param(tty); | |
1146 | ||
1147 | dgnc_carrier(ch); | |
1148 | ||
8b07d521 | 1149 | /* |
0b99d589 LL |
1150 | * follow protocol for opening port |
1151 | */ | |
1152 | ||
a44b508a | 1153 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1154 | |
1155 | rc = dgnc_block_til_ready(tty, file, ch); | |
1156 | ||
0b99d589 | 1157 | /* No going back now, increment our unit and channel counters */ |
a44b508a | 1158 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1159 | ch->ch_open_count++; |
1160 | un->un_open_count++; | |
1161 | un->un_flags |= (UN_ISOPEN); | |
a44b508a | 1162 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1163 | |
8f90ef80 | 1164 | return rc; |
0b99d589 LL |
1165 | } |
1166 | ||
8b07d521 | 1167 | /* |
0b99d589 LL |
1168 | * dgnc_block_til_ready() |
1169 | * | |
1170 | * Wait for DCD, if needed. | |
1171 | */ | |
851f306d CM |
1172 | static int dgnc_block_til_ready(struct tty_struct *tty, |
1173 | struct file *file, | |
1174 | struct channel_t *ch) | |
8b07d521 | 1175 | { |
0b99d589 | 1176 | int retval = 0; |
10334418 | 1177 | struct un_t *un = tty->driver_data; |
a44b508a | 1178 | unsigned long flags; |
0b99d589 LL |
1179 | uint old_flags = 0; |
1180 | int sleep_on_un_flags = 0; | |
1181 | ||
10334418 | 1182 | if (!file) |
8f90ef80 | 1183 | return -ENXIO; |
0b99d589 | 1184 | |
a44b508a | 1185 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1186 | |
1187 | ch->ch_wopen++; | |
1188 | ||
1189 | /* Loop forever */ | |
1190 | while (1) { | |
0b99d589 LL |
1191 | sleep_on_un_flags = 0; |
1192 | ||
1193 | /* | |
851f306d CM |
1194 | * If board has failed somehow during our sleep, |
1195 | * bail with error. | |
0b99d589 LL |
1196 | */ |
1197 | if (ch->ch_bd->state == BOARD_FAILED) { | |
1198 | retval = -ENXIO; | |
1199 | break; | |
1200 | } | |
1201 | ||
1202 | /* If tty was hung up, break out of loop and set error. */ | |
1203 | if (tty_hung_up_p(file)) { | |
1204 | retval = -EAGAIN; | |
1205 | break; | |
1206 | } | |
1207 | ||
1208 | /* | |
1209 | * If either unit is in the middle of the fragile part of close, | |
1210 | * we just cannot touch the channel safely. | |
1211 | * Go back to sleep, knowing that when the channel can be | |
8b07d521 | 1212 | * touched safely, the close routine will signal the |
0b99d589 LL |
1213 | * ch_wait_flags to wake us back up. |
1214 | */ | |
851f306d CM |
1215 | if (!((ch->ch_tun.un_flags | |
1216 | ch->ch_pun.un_flags) & | |
1217 | UN_CLOSING)) { | |
0b99d589 LL |
1218 | /* |
1219 | * Our conditions to leave cleanly and happily: | |
1220 | * 1) NONBLOCKING on the tty is set. | |
1221 | * 2) CLOCAL is set. | |
1222 | * 3) DCD (fake or real) is active. | |
1223 | */ | |
1224 | ||
50667c67 | 1225 | if (file->f_flags & O_NONBLOCK) |
0b99d589 | 1226 | break; |
0b99d589 | 1227 | |
18900ca6 | 1228 | if (tty_io_error(tty)) { |
0b99d589 LL |
1229 | retval = -EIO; |
1230 | break; | |
1231 | } | |
1232 | ||
f1e51745 | 1233 | if (ch->ch_flags & CH_CD) |
0b99d589 | 1234 | break; |
0b99d589 | 1235 | |
f1e51745 | 1236 | if (ch->ch_flags & CH_FCAR) |
0b99d589 | 1237 | break; |
2000c581 | 1238 | } else { |
0b99d589 LL |
1239 | sleep_on_un_flags = 1; |
1240 | } | |
1241 | ||
1242 | /* | |
1243 | * If there is a signal pending, the user probably | |
1244 | * interrupted (ctrl-c) us. | |
1245 | * Leave loop with error set. | |
1246 | */ | |
1247 | if (signal_pending(current)) { | |
0b99d589 LL |
1248 | retval = -ERESTARTSYS; |
1249 | break; | |
1250 | } | |
1251 | ||
0b99d589 LL |
1252 | /* |
1253 | * Store the flags before we let go of channel lock | |
1254 | */ | |
1255 | if (sleep_on_un_flags) | |
1256 | old_flags = ch->ch_tun.un_flags | ch->ch_pun.un_flags; | |
1257 | else | |
1258 | old_flags = ch->ch_flags; | |
1259 | ||
1260 | /* | |
1261 | * Let go of channel lock before calling schedule. | |
1262 | * Our poller will get any FEP events and wake us up when DCD | |
1263 | * eventually goes active. | |
1264 | */ | |
1265 | ||
a44b508a | 1266 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1267 | |
0b99d589 | 1268 | /* |
851f306d CM |
1269 | * Wait for something in the flags to change |
1270 | * from the current value. | |
0b99d589 | 1271 | */ |
50667c67 | 1272 | if (sleep_on_un_flags) |
0b99d589 | 1273 | retval = wait_event_interruptible(un->un_flags_wait, |
851f306d CM |
1274 | (old_flags != (ch->ch_tun.un_flags | |
1275 | ch->ch_pun.un_flags))); | |
50667c67 | 1276 | else |
0b99d589 LL |
1277 | retval = wait_event_interruptible(ch->ch_flags_wait, |
1278 | (old_flags != ch->ch_flags)); | |
0b99d589 | 1279 | |
0b99d589 LL |
1280 | /* |
1281 | * We got woken up for some reason. | |
1282 | * Before looping around, grab our channel lock. | |
1283 | */ | |
a44b508a | 1284 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1285 | } |
1286 | ||
1287 | ch->ch_wopen--; | |
1288 | ||
a44b508a | 1289 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1290 | |
36e712a8 | 1291 | return retval; |
0b99d589 LL |
1292 | } |
1293 | ||
0b99d589 LL |
1294 | /* |
1295 | * dgnc_tty_hangup() | |
1296 | * | |
1297 | * Hangup the port. Like a close, but don't wait for output to drain. | |
8b07d521 | 1298 | */ |
0b99d589 LL |
1299 | static void dgnc_tty_hangup(struct tty_struct *tty) |
1300 | { | |
0b99d589 LL |
1301 | if (!tty || tty->magic != TTY_MAGIC) |
1302 | return; | |
1303 | ||
0b99d589 LL |
1304 | /* flush the transmit queues */ |
1305 | dgnc_tty_flush_buffer(tty); | |
0b99d589 LL |
1306 | } |
1307 | ||
0b99d589 LL |
1308 | /* |
1309 | * dgnc_tty_close() | |
1310 | * | |
1311 | */ | |
1312 | static void dgnc_tty_close(struct tty_struct *tty, struct file *file) | |
1313 | { | |
03425f55 | 1314 | struct dgnc_board *bd; |
0b99d589 LL |
1315 | struct channel_t *ch; |
1316 | struct un_t *un; | |
a44b508a | 1317 | unsigned long flags; |
0b99d589 LL |
1318 | |
1319 | if (!tty || tty->magic != TTY_MAGIC) | |
1320 | return; | |
1321 | ||
1322 | un = tty->driver_data; | |
1323 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1324 | return; | |
1325 | ||
1326 | ch = un->un_ch; | |
1327 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1328 | return; | |
1329 | ||
1330 | bd = ch->ch_bd; | |
1331 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1332 | return; | |
1333 | ||
a44b508a | 1334 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1335 | |
1336 | /* | |
1337 | * Determine if this is the last close or not - and if we agree about | |
1338 | * which type of close it is with the Line Discipline | |
1339 | */ | |
1340 | if ((tty->count == 1) && (un->un_open_count != 1)) { | |
1341 | /* | |
1342 | * Uh, oh. tty->count is 1, which means that the tty | |
1343 | * structure will be freed. un_open_count should always | |
1344 | * be one in these conditions. If it's greater than | |
1345 | * one, we've got real problems, since it means the | |
1346 | * serial port won't be shutdown. | |
1347 | */ | |
1f26adc9 RD |
1348 | dev_dbg(tty->dev, |
1349 | "tty->count is 1, un open count is %d\n", | |
1350 | un->un_open_count); | |
0b99d589 | 1351 | un->un_open_count = 1; |
8b07d521 | 1352 | } |
0b99d589 | 1353 | |
3098e514 DY |
1354 | if (un->un_open_count) |
1355 | un->un_open_count--; | |
1356 | else | |
1f26adc9 RD |
1357 | dev_dbg(tty->dev, |
1358 | "bad serial port open count of %d\n", | |
1359 | un->un_open_count); | |
0b99d589 LL |
1360 | |
1361 | ch->ch_open_count--; | |
1362 | ||
1363 | if (ch->ch_open_count && un->un_open_count) { | |
a44b508a | 1364 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
90d2a471 LL |
1365 | return; |
1366 | } | |
0b99d589 LL |
1367 | |
1368 | /* OK, its the last close on the unit */ | |
0b99d589 LL |
1369 | un->un_flags |= UN_CLOSING; |
1370 | ||
1371 | tty->closing = 1; | |
1372 | ||
0b99d589 LL |
1373 | /* |
1374 | * Only officially close channel if count is 0 and | |
90d2a471 | 1375 | * DIGI_PRINTER bit is not set. |
0b99d589 | 1376 | */ |
851f306d CM |
1377 | if ((ch->ch_open_count == 0) && |
1378 | !(ch->ch_digi.digi_flags & DIGI_PRINTER)) { | |
0b99d589 LL |
1379 | ch->ch_flags &= ~(CH_STOPI | CH_FORCED_STOPI); |
1380 | ||
1381 | /* | |
1382 | * turn off print device when closing print device. | |
1383 | */ | |
9cdf838b | 1384 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1385 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1386 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1387 | ch->ch_flags &= ~CH_PRON; |
1388 | } | |
1389 | ||
a44b508a | 1390 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1391 | /* wait for output to drain */ |
1392 | /* This will also return if we take an interrupt */ | |
1393 | ||
2d9920ec | 1394 | bd->bd_ops->drain(tty, 0); |
0b99d589 | 1395 | |
0b99d589 LL |
1396 | dgnc_tty_flush_buffer(tty); |
1397 | tty_ldisc_flush(tty); | |
1398 | ||
a44b508a | 1399 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1400 | |
1401 | tty->closing = 0; | |
1402 | ||
1403 | /* | |
1404 | * If we have HUPCL set, lower DTR and RTS | |
1405 | */ | |
1406 | if (ch->ch_c_cflag & HUPCL) { | |
0b99d589 LL |
1407 | /* Drop RTS/DTR */ |
1408 | ch->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
1409 | bd->bd_ops->assert_modem_signals(ch); | |
1410 | ||
1411 | /* | |
8b07d521 | 1412 | * Go to sleep to ensure RTS/DTR |
0b99d589 LL |
1413 | * have been dropped for modems to see it. |
1414 | */ | |
1415 | if (ch->ch_close_delay) { | |
a44b508a RD |
1416 | spin_unlock_irqrestore(&ch->ch_lock, |
1417 | flags); | |
0b99d589 | 1418 | dgnc_ms_sleep(ch->ch_close_delay); |
a44b508a | 1419 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1420 | } |
1421 | } | |
1422 | ||
1423 | ch->ch_old_baud = 0; | |
1424 | ||
1425 | /* Turn off UART interrupts for this port */ | |
1426 | ch->ch_bd->bd_ops->uart_off(ch); | |
2000c581 | 1427 | } else { |
0b99d589 LL |
1428 | /* |
1429 | * turn off print device when closing print device. | |
1430 | */ | |
9cdf838b | 1431 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1432 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1433 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1434 | ch->ch_flags &= ~CH_PRON; |
1435 | } | |
1436 | } | |
1437 | ||
1438 | un->un_tty = NULL; | |
1439 | un->un_flags &= ~(UN_ISOPEN | UN_CLOSING); | |
1440 | ||
0b99d589 LL |
1441 | wake_up_interruptible(&ch->ch_flags_wait); |
1442 | wake_up_interruptible(&un->un_flags_wait); | |
1443 | ||
a44b508a | 1444 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1445 | } |
1446 | ||
0b99d589 LL |
1447 | /* |
1448 | * dgnc_tty_chars_in_buffer() | |
1449 | * | |
1450 | * Return number of characters that have not been transmitted yet. | |
1451 | * | |
1452 | * This routine is used by the line discipline to determine if there | |
1453 | * is data waiting to be transmitted/drained/flushed or not. | |
1454 | */ | |
1455 | static int dgnc_tty_chars_in_buffer(struct tty_struct *tty) | |
1456 | { | |
1457 | struct channel_t *ch = NULL; | |
1458 | struct un_t *un = NULL; | |
1459 | ushort thead; | |
1460 | ushort ttail; | |
1461 | uint tmask; | |
1462 | uint chars = 0; | |
a44b508a | 1463 | unsigned long flags; |
0b99d589 | 1464 | |
60acb623 | 1465 | if (!tty) |
8f90ef80 | 1466 | return 0; |
0b99d589 LL |
1467 | |
1468 | un = tty->driver_data; | |
1469 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1470 | return 0; |
0b99d589 LL |
1471 | |
1472 | ch = un->un_ch; | |
1473 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1474 | return 0; |
0b99d589 | 1475 | |
a44b508a | 1476 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1477 | |
1478 | tmask = WQUEUEMASK; | |
1479 | thead = ch->ch_w_head & tmask; | |
1480 | ttail = ch->ch_w_tail & tmask; | |
1481 | ||
a44b508a | 1482 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1483 | |
1484 | if (ttail == thead) { | |
1485 | chars = 0; | |
1486 | } else { | |
1487 | if (thead >= ttail) | |
1488 | chars = thead - ttail; | |
1489 | else | |
1490 | chars = thead - ttail + WQUEUESIZE; | |
1491 | } | |
1492 | ||
8f90ef80 | 1493 | return chars; |
0b99d589 LL |
1494 | } |
1495 | ||
8b07d521 | 1496 | /* |
0b99d589 LL |
1497 | * dgnc_maxcps_room |
1498 | * | |
1499 | * Reduces bytes_available to the max number of characters | |
1500 | * that can be sent currently given the maxcps value, and | |
1501 | * returns the new bytes_available. This only affects printer | |
1502 | * output. | |
8b07d521 | 1503 | */ |
107b40ad | 1504 | static int dgnc_maxcps_room(struct channel_t *ch, int bytes_available) |
0b99d589 | 1505 | { |
9cdf838b | 1506 | if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0) { |
0b99d589 LL |
1507 | int cps_limit = 0; |
1508 | unsigned long current_time = jiffies; | |
1509 | unsigned long buffer_time = current_time + | |
851f306d CM |
1510 | (HZ * ch->ch_digi.digi_bufsize) / |
1511 | ch->ch_digi.digi_maxcps; | |
0b99d589 LL |
1512 | |
1513 | if (ch->ch_cpstime < current_time) { | |
1514 | /* buffer is empty */ | |
851f306d | 1515 | ch->ch_cpstime = current_time; /* reset ch_cpstime */ |
0b99d589 | 1516 | cps_limit = ch->ch_digi.digi_bufsize; |
2000c581 | 1517 | } else if (ch->ch_cpstime < buffer_time) { |
0b99d589 | 1518 | /* still room in the buffer */ |
851f306d CM |
1519 | cps_limit = ((buffer_time - ch->ch_cpstime) * |
1520 | ch->ch_digi.digi_maxcps) / HZ; | |
2000c581 | 1521 | } else { |
0b99d589 | 1522 | /* no room in the buffer */ |
8b07d521 | 1523 | cps_limit = 0; |
0b99d589 LL |
1524 | } |
1525 | ||
1526 | bytes_available = min(cps_limit, bytes_available); | |
1527 | } | |
1528 | ||
8f90ef80 | 1529 | return bytes_available; |
0b99d589 LL |
1530 | } |
1531 | ||
0b99d589 LL |
1532 | /* |
1533 | * dgnc_tty_write_room() | |
1534 | * | |
1535 | * Return space available in Tx buffer | |
8b07d521 | 1536 | */ |
0b99d589 LL |
1537 | static int dgnc_tty_write_room(struct tty_struct *tty) |
1538 | { | |
1539 | struct channel_t *ch = NULL; | |
1540 | struct un_t *un = NULL; | |
1541 | ushort head; | |
1542 | ushort tail; | |
1543 | ushort tmask; | |
1544 | int ret = 0; | |
a44b508a | 1545 | unsigned long flags; |
0b99d589 | 1546 | |
60acb623 | 1547 | if (!tty || !dgnc_TmpWriteBuf) |
8f90ef80 | 1548 | return 0; |
0b99d589 LL |
1549 | |
1550 | un = tty->driver_data; | |
1551 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1552 | return 0; |
0b99d589 LL |
1553 | |
1554 | ch = un->un_ch; | |
1555 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1556 | return 0; |
0b99d589 | 1557 | |
a44b508a | 1558 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1559 | |
1560 | tmask = WQUEUEMASK; | |
1561 | head = (ch->ch_w_head) & tmask; | |
1562 | tail = (ch->ch_w_tail) & tmask; | |
1563 | ||
f7c851d4 CP |
1564 | ret = tail - head - 1; |
1565 | if (ret < 0) | |
0b99d589 LL |
1566 | ret += WQUEUESIZE; |
1567 | ||
1568 | /* Limit printer to maxcps */ | |
107b40ad DY |
1569 | if (un->un_type != DGNC_PRINT) |
1570 | ret = dgnc_maxcps_room(ch, ret); | |
0b99d589 LL |
1571 | |
1572 | /* | |
8b07d521 | 1573 | * If we are printer device, leave space for |
0b99d589 LL |
1574 | * possibly both the on and off strings. |
1575 | */ | |
1576 | if (un->un_type == DGNC_PRINT) { | |
1577 | if (!(ch->ch_flags & CH_PRON)) | |
1578 | ret -= ch->ch_digi.digi_onlen; | |
1579 | ret -= ch->ch_digi.digi_offlen; | |
2000c581 | 1580 | } else { |
0b99d589 LL |
1581 | if (ch->ch_flags & CH_PRON) |
1582 | ret -= ch->ch_digi.digi_offlen; | |
1583 | } | |
1584 | ||
1585 | if (ret < 0) | |
1586 | ret = 0; | |
1587 | ||
a44b508a | 1588 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8b07d521 | 1589 | |
8f90ef80 | 1590 | return ret; |
0b99d589 LL |
1591 | } |
1592 | ||
0b99d589 LL |
1593 | /* |
1594 | * dgnc_tty_put_char() | |
1595 | * | |
1596 | * Put a character into ch->ch_buf | |
8b07d521 | 1597 | * |
0b99d589 LL |
1598 | * - used by the line discipline for OPOST processing |
1599 | */ | |
1600 | static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c) | |
1601 | { | |
1602 | /* | |
1603 | * Simply call tty_write. | |
1604 | */ | |
0b99d589 LL |
1605 | dgnc_tty_write(tty, &c, 1); |
1606 | return 1; | |
1607 | } | |
1608 | ||
0b99d589 LL |
1609 | /* |
1610 | * dgnc_tty_write() | |
1611 | * | |
1612 | * Take data from the user or kernel and send it out to the FEP. | |
1613 | * In here exists all the Transparent Print magic as well. | |
1614 | */ | |
1615 | static int dgnc_tty_write(struct tty_struct *tty, | |
e352d3f1 | 1616 | const unsigned char *buf, int count) |
0b99d589 LL |
1617 | { |
1618 | struct channel_t *ch = NULL; | |
1619 | struct un_t *un = NULL; | |
1620 | int bufcount = 0, n = 0; | |
a44b508a | 1621 | unsigned long flags; |
0b99d589 LL |
1622 | ushort head; |
1623 | ushort tail; | |
1624 | ushort tmask; | |
1625 | uint remain; | |
0b99d589 | 1626 | |
60acb623 | 1627 | if (!tty || !dgnc_TmpWriteBuf) |
8f90ef80 | 1628 | return 0; |
0b99d589 LL |
1629 | |
1630 | un = tty->driver_data; | |
1631 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1632 | return 0; |
0b99d589 LL |
1633 | |
1634 | ch = un->un_ch; | |
1635 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1636 | return 0; |
0b99d589 LL |
1637 | |
1638 | if (!count) | |
8f90ef80 | 1639 | return 0; |
0b99d589 | 1640 | |
0b99d589 LL |
1641 | /* |
1642 | * Store original amount of characters passed in. | |
1643 | * This helps to figure out if we should ask the FEP | |
1644 | * to send us an event when it has more space available. | |
1645 | */ | |
0b99d589 | 1646 | |
a44b508a | 1647 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1648 | |
1649 | /* Get our space available for the channel from the board */ | |
1650 | tmask = WQUEUEMASK; | |
1651 | head = (ch->ch_w_head) & tmask; | |
1652 | tail = (ch->ch_w_tail) & tmask; | |
1653 | ||
f7c851d4 CP |
1654 | bufcount = tail - head - 1; |
1655 | if (bufcount < 0) | |
0b99d589 LL |
1656 | bufcount += WQUEUESIZE; |
1657 | ||
0b99d589 LL |
1658 | /* |
1659 | * Limit printer output to maxcps overall, with bursts allowed | |
1660 | * up to bufsize characters. | |
1661 | */ | |
107b40ad DY |
1662 | if (un->un_type != DGNC_PRINT) |
1663 | bufcount = dgnc_maxcps_room(ch, bufcount); | |
0b99d589 LL |
1664 | |
1665 | /* | |
1666 | * Take minimum of what the user wants to send, and the | |
1667 | * space available in the FEP buffer. | |
1668 | */ | |
1669 | count = min(count, bufcount); | |
1670 | ||
1671 | /* | |
1672 | * Bail if no space left. | |
1673 | */ | |
c84a083b QL |
1674 | if (count <= 0) |
1675 | goto exit_retry; | |
0b99d589 LL |
1676 | |
1677 | /* | |
1678 | * Output the printer ON string, if we are in terminal mode, but | |
1679 | * need to be in printer mode. | |
1680 | */ | |
1681 | if ((un->un_type == DGNC_PRINT) && !(ch->ch_flags & CH_PRON)) { | |
1682 | dgnc_wmove(ch, ch->ch_digi.digi_onstr, | |
e352d3f1 | 1683 | (int)ch->ch_digi.digi_onlen); |
0b99d589 LL |
1684 | head = (ch->ch_w_head) & tmask; |
1685 | ch->ch_flags |= CH_PRON; | |
1686 | } | |
1687 | ||
1688 | /* | |
1689 | * On the other hand, output the printer OFF string, if we are | |
1690 | * currently in printer mode, but need to output to the terminal. | |
1691 | */ | |
1692 | if ((un->un_type != DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { | |
1693 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, | |
e352d3f1 | 1694 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1695 | head = (ch->ch_w_head) & tmask; |
1696 | ch->ch_flags &= ~CH_PRON; | |
1697 | } | |
1698 | ||
0b99d589 LL |
1699 | n = count; |
1700 | ||
1701 | /* | |
1702 | * If the write wraps over the top of the circular buffer, | |
1703 | * move the portion up to the wrap point, and reset the | |
1704 | * pointers to the bottom. | |
1705 | */ | |
1706 | remain = WQUEUESIZE - head; | |
1707 | ||
1708 | if (n >= remain) { | |
1709 | n -= remain; | |
1710 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1711 | head = 0; |
1712 | buf += remain; | |
1713 | } | |
1714 | ||
1715 | if (n > 0) { | |
1716 | /* | |
1717 | * Move rest of data. | |
1718 | */ | |
1719 | remain = n; | |
1720 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1721 | head += remain; |
1722 | } | |
1723 | ||
1724 | if (count) { | |
1725 | head &= tmask; | |
1726 | ch->ch_w_head = head; | |
1727 | } | |
1728 | ||
0b99d589 | 1729 | /* Update printer buffer empty time. */ |
8d0d4cc5 RS |
1730 | if ((un->un_type == DGNC_PRINT) && (ch->ch_digi.digi_maxcps > 0) && |
1731 | (ch->ch_digi.digi_bufsize > 0)) { | |
90d2a471 | 1732 | ch->ch_cpstime += (HZ * count) / ch->ch_digi.digi_maxcps; |
0b99d589 LL |
1733 | } |
1734 | ||
a74d8e21 | 1735 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1736 | |
0b99d589 LL |
1737 | if (count) { |
1738 | /* | |
1739 | * Channel lock is grabbed and then released | |
1740 | * inside this routine. | |
1741 | */ | |
1742 | ch->ch_bd->bd_ops->copy_data_from_queue_to_uart(ch); | |
1743 | } | |
1744 | ||
8f90ef80 | 1745 | return count; |
c84a083b QL |
1746 | |
1747 | exit_retry: | |
1748 | ||
1749 | spin_unlock_irqrestore(&ch->ch_lock, flags); | |
1750 | return 0; | |
0b99d589 LL |
1751 | } |
1752 | ||
0b99d589 LL |
1753 | /* |
1754 | * Return modem signals to ld. | |
1755 | */ | |
b74c7461 | 1756 | |
0b99d589 | 1757 | static int dgnc_tty_tiocmget(struct tty_struct *tty) |
0b99d589 LL |
1758 | { |
1759 | struct channel_t *ch; | |
1760 | struct un_t *un; | |
1761 | int result = -EIO; | |
446393e9 | 1762 | unsigned char mstat = 0; |
a44b508a | 1763 | unsigned long flags; |
0b99d589 LL |
1764 | |
1765 | if (!tty || tty->magic != TTY_MAGIC) | |
1766 | return result; | |
1767 | ||
1768 | un = tty->driver_data; | |
1769 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1770 | return result; | |
1771 | ||
1772 | ch = un->un_ch; | |
1773 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1774 | return result; | |
1775 | ||
a44b508a | 1776 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1777 | |
0b7ceaa6 | 1778 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1779 | |
a44b508a | 1780 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1781 | |
1782 | result = 0; | |
1783 | ||
1784 | if (mstat & UART_MCR_DTR) | |
1785 | result |= TIOCM_DTR; | |
1786 | if (mstat & UART_MCR_RTS) | |
1787 | result |= TIOCM_RTS; | |
1788 | if (mstat & UART_MSR_CTS) | |
1789 | result |= TIOCM_CTS; | |
1790 | if (mstat & UART_MSR_DSR) | |
1791 | result |= TIOCM_DSR; | |
1792 | if (mstat & UART_MSR_RI) | |
1793 | result |= TIOCM_RI; | |
1794 | if (mstat & UART_MSR_DCD) | |
1795 | result |= TIOCM_CD; | |
1796 | ||
0b99d589 LL |
1797 | return result; |
1798 | } | |
1799 | ||
0b99d589 LL |
1800 | /* |
1801 | * dgnc_tty_tiocmset() | |
1802 | * | |
1803 | * Set modem signals, called by ld. | |
1804 | */ | |
b74c7461 | 1805 | |
0b99d589 | 1806 | static int dgnc_tty_tiocmset(struct tty_struct *tty, |
e352d3f1 | 1807 | unsigned int set, unsigned int clear) |
0b99d589 | 1808 | { |
03425f55 | 1809 | struct dgnc_board *bd; |
0b99d589 LL |
1810 | struct channel_t *ch; |
1811 | struct un_t *un; | |
1812 | int ret = -EIO; | |
a44b508a | 1813 | unsigned long flags; |
0b99d589 LL |
1814 | |
1815 | if (!tty || tty->magic != TTY_MAGIC) | |
1816 | return ret; | |
1817 | ||
1818 | un = tty->driver_data; | |
1819 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1820 | return ret; | |
1821 | ||
1822 | ch = un->un_ch; | |
1823 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1824 | return ret; | |
1825 | ||
1826 | bd = ch->ch_bd; | |
1827 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1828 | return ret; | |
1829 | ||
a44b508a | 1830 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1831 | |
50667c67 | 1832 | if (set & TIOCM_RTS) |
0b99d589 | 1833 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 1834 | |
50667c67 | 1835 | if (set & TIOCM_DTR) |
0b99d589 | 1836 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 | 1837 | |
50667c67 | 1838 | if (clear & TIOCM_RTS) |
0b99d589 | 1839 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 1840 | |
50667c67 | 1841 | if (clear & TIOCM_DTR) |
0b99d589 | 1842 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
1843 | |
1844 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
1845 | ||
a44b508a | 1846 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1847 | |
8f90ef80 | 1848 | return 0; |
0b99d589 LL |
1849 | } |
1850 | ||
0b99d589 LL |
1851 | /* |
1852 | * dgnc_tty_send_break() | |
1853 | * | |
1854 | * Send a Break, called by ld. | |
1855 | */ | |
1856 | static int dgnc_tty_send_break(struct tty_struct *tty, int msec) | |
1857 | { | |
03425f55 | 1858 | struct dgnc_board *bd; |
0b99d589 LL |
1859 | struct channel_t *ch; |
1860 | struct un_t *un; | |
1861 | int ret = -EIO; | |
a44b508a | 1862 | unsigned long flags; |
0b99d589 LL |
1863 | |
1864 | if (!tty || tty->magic != TTY_MAGIC) | |
1865 | return ret; | |
1866 | ||
1867 | un = tty->driver_data; | |
1868 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1869 | return ret; | |
1870 | ||
1871 | ch = un->un_ch; | |
1872 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1873 | return ret; | |
1874 | ||
1875 | bd = ch->ch_bd; | |
1876 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1877 | return ret; | |
1878 | ||
1879 | switch (msec) { | |
1880 | case -1: | |
1881 | msec = 0xFFFF; | |
1882 | break; | |
1883 | case 0: | |
1884 | msec = 0; | |
1885 | break; | |
1886 | default: | |
1887 | break; | |
1888 | } | |
1889 | ||
a44b508a | 1890 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1891 | |
1892 | ch->ch_bd->bd_ops->send_break(ch, msec); | |
1893 | ||
a44b508a | 1894 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1895 | |
8f90ef80 | 1896 | return 0; |
0b99d589 LL |
1897 | } |
1898 | ||
0b99d589 LL |
1899 | /* |
1900 | * dgnc_tty_wait_until_sent() | |
1901 | * | |
1902 | * wait until data has been transmitted, called by ld. | |
1903 | */ | |
1904 | static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
1905 | { | |
03425f55 | 1906 | struct dgnc_board *bd; |
0b99d589 LL |
1907 | struct channel_t *ch; |
1908 | struct un_t *un; | |
0b99d589 LL |
1909 | |
1910 | if (!tty || tty->magic != TTY_MAGIC) | |
1911 | return; | |
1912 | ||
1913 | un = tty->driver_data; | |
1914 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1915 | return; | |
1916 | ||
1917 | ch = un->un_ch; | |
1918 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1919 | return; | |
1920 | ||
1921 | bd = ch->ch_bd; | |
1922 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1923 | return; | |
1924 | ||
2d9920ec | 1925 | bd->bd_ops->drain(tty, 0); |
8b07d521 | 1926 | } |
0b99d589 | 1927 | |
0b99d589 LL |
1928 | /* |
1929 | * dgnc_send_xchar() | |
1930 | * | |
1931 | * send a high priority character, called by ld. | |
1932 | */ | |
1933 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char c) | |
1934 | { | |
03425f55 | 1935 | struct dgnc_board *bd; |
0b99d589 LL |
1936 | struct channel_t *ch; |
1937 | struct un_t *un; | |
a44b508a | 1938 | unsigned long flags; |
0b99d589 LL |
1939 | |
1940 | if (!tty || tty->magic != TTY_MAGIC) | |
1941 | return; | |
1942 | ||
1943 | un = tty->driver_data; | |
1944 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1945 | return; | |
1946 | ||
1947 | ch = un->un_ch; | |
1948 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1949 | return; | |
1950 | ||
1951 | bd = ch->ch_bd; | |
1952 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1953 | return; | |
1954 | ||
f3dadd29 | 1955 | dev_dbg(tty->dev, "dgnc_tty_send_xchar start\n"); |
0b99d589 | 1956 | |
a44b508a | 1957 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1958 | bd->bd_ops->send_immediate_char(ch, c); |
a44b508a | 1959 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1960 | |
f3dadd29 | 1961 | dev_dbg(tty->dev, "dgnc_tty_send_xchar finish\n"); |
8b07d521 | 1962 | } |
0b99d589 | 1963 | |
0b99d589 LL |
1964 | /* |
1965 | * Return modem signals to ld. | |
1966 | */ | |
1967 | static inline int dgnc_get_mstat(struct channel_t *ch) | |
1968 | { | |
1969 | unsigned char mstat; | |
290e3aba | 1970 | int result = 0; |
a44b508a | 1971 | unsigned long flags; |
0b99d589 | 1972 | |
0b99d589 | 1973 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
8f90ef80 | 1974 | return -ENXIO; |
0b99d589 | 1975 | |
a44b508a | 1976 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1977 | |
0b7ceaa6 | 1978 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1979 | |
a44b508a | 1980 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1981 | |
0b99d589 LL |
1982 | if (mstat & UART_MCR_DTR) |
1983 | result |= TIOCM_DTR; | |
1984 | if (mstat & UART_MCR_RTS) | |
1985 | result |= TIOCM_RTS; | |
1986 | if (mstat & UART_MSR_CTS) | |
1987 | result |= TIOCM_CTS; | |
1988 | if (mstat & UART_MSR_DSR) | |
1989 | result |= TIOCM_DSR; | |
1990 | if (mstat & UART_MSR_RI) | |
1991 | result |= TIOCM_RI; | |
1992 | if (mstat & UART_MSR_DCD) | |
1993 | result |= TIOCM_CD; | |
1994 | ||
8f90ef80 | 1995 | return result; |
0b99d589 LL |
1996 | } |
1997 | ||
0b99d589 LL |
1998 | /* |
1999 | * Return modem signals to ld. | |
2000 | */ | |
851f306d CM |
2001 | static int dgnc_get_modem_info(struct channel_t *ch, |
2002 | unsigned int __user *value) | |
0b99d589 | 2003 | { |
a5b90ef7 | 2004 | return put_user(dgnc_get_mstat(ch), value); |
0b99d589 LL |
2005 | } |
2006 | ||
0b99d589 LL |
2007 | /* |
2008 | * dgnc_set_modem_info() | |
2009 | * | |
2010 | * Set modem signals, called by ld. | |
2011 | */ | |
c23b48e0 | 2012 | static int dgnc_set_modem_info(struct channel_t *ch, |
851f306d CM |
2013 | unsigned int command, |
2014 | unsigned int __user *value) | |
0b99d589 | 2015 | { |
0b99d589 LL |
2016 | int ret = -ENXIO; |
2017 | unsigned int arg = 0; | |
a44b508a | 2018 | unsigned long flags; |
0b99d589 | 2019 | |
0b99d589 LL |
2020 | ret = get_user(arg, value); |
2021 | if (ret) | |
8f90ef80 | 2022 | return ret; |
0b99d589 LL |
2023 | |
2024 | switch (command) { | |
2025 | case TIOCMBIS: | |
50667c67 | 2026 | if (arg & TIOCM_RTS) |
0b99d589 | 2027 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 2028 | |
50667c67 | 2029 | if (arg & TIOCM_DTR) |
0b99d589 | 2030 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 LL |
2031 | |
2032 | break; | |
2033 | ||
2034 | case TIOCMBIC: | |
50667c67 | 2035 | if (arg & TIOCM_RTS) |
0b99d589 | 2036 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 2037 | |
50667c67 | 2038 | if (arg & TIOCM_DTR) |
0b99d589 | 2039 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
2040 | |
2041 | break; | |
2042 | ||
90d2a471 | 2043 | case TIOCMSET: |
0b99d589 | 2044 | |
50667c67 | 2045 | if (arg & TIOCM_RTS) |
0b99d589 | 2046 | ch->ch_mostat |= UART_MCR_RTS; |
50667c67 | 2047 | else |
0b99d589 | 2048 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 2049 | |
50667c67 | 2050 | if (arg & TIOCM_DTR) |
0b99d589 | 2051 | ch->ch_mostat |= UART_MCR_DTR; |
50667c67 | 2052 | else |
0b99d589 | 2053 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
2054 | |
2055 | break; | |
2056 | ||
2057 | default: | |
8f90ef80 | 2058 | return -EINVAL; |
0b99d589 LL |
2059 | } |
2060 | ||
a44b508a | 2061 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2062 | |
2063 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
2064 | ||
a44b508a | 2065 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2066 | |
8f90ef80 | 2067 | return 0; |
0b99d589 LL |
2068 | } |
2069 | ||
0b99d589 | 2070 | /* |
8b07d521 | 2071 | * dgnc_tty_digigeta() |
0b99d589 LL |
2072 | * |
2073 | * Ioctl to get the information for ditty. | |
2074 | * | |
2075 | * | |
2076 | * | |
2077 | */ | |
851f306d CM |
2078 | static int dgnc_tty_digigeta(struct tty_struct *tty, |
2079 | struct digi_t __user *retinfo) | |
0b99d589 LL |
2080 | { |
2081 | struct channel_t *ch; | |
2082 | struct un_t *un; | |
2083 | struct digi_t tmp; | |
a44b508a | 2084 | unsigned long flags; |
0b99d589 LL |
2085 | |
2086 | if (!retinfo) | |
8f90ef80 | 2087 | return -EFAULT; |
0b99d589 LL |
2088 | |
2089 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2090 | return -EFAULT; |
0b99d589 LL |
2091 | |
2092 | un = tty->driver_data; | |
2093 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2094 | return -EFAULT; |
0b99d589 LL |
2095 | |
2096 | ch = un->un_ch; | |
2097 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2098 | return -EFAULT; |
0b99d589 LL |
2099 | |
2100 | memset(&tmp, 0, sizeof(tmp)); | |
2101 | ||
a44b508a | 2102 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2103 | memcpy(&tmp, &ch->ch_digi, sizeof(tmp)); |
a44b508a | 2104 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2105 | |
2106 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) | |
8f90ef80 | 2107 | return -EFAULT; |
0b99d589 | 2108 | |
8f90ef80 | 2109 | return 0; |
0b99d589 LL |
2110 | } |
2111 | ||
0b99d589 | 2112 | /* |
8b07d521 | 2113 | * dgnc_tty_digiseta() |
0b99d589 LL |
2114 | * |
2115 | * Ioctl to set the information for ditty. | |
2116 | * | |
2117 | * | |
2118 | * | |
2119 | */ | |
851f306d CM |
2120 | static int dgnc_tty_digiseta(struct tty_struct *tty, |
2121 | struct digi_t __user *new_info) | |
0b99d589 | 2122 | { |
03425f55 | 2123 | struct dgnc_board *bd; |
0b99d589 LL |
2124 | struct channel_t *ch; |
2125 | struct un_t *un; | |
2126 | struct digi_t new_digi; | |
a44b508a | 2127 | unsigned long flags; |
0b99d589 | 2128 | |
0b99d589 | 2129 | if (!tty || tty->magic != TTY_MAGIC) |
8f90ef80 | 2130 | return -EFAULT; |
0b99d589 LL |
2131 | |
2132 | un = tty->driver_data; | |
2133 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2134 | return -EFAULT; |
0b99d589 LL |
2135 | |
2136 | ch = un->un_ch; | |
2137 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2138 | return -EFAULT; |
0b99d589 LL |
2139 | |
2140 | bd = ch->ch_bd; | |
2141 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2142 | return -EFAULT; |
0b99d589 | 2143 | |
f1e51745 | 2144 | if (copy_from_user(&new_digi, new_info, sizeof(new_digi))) |
8f90ef80 | 2145 | return -EFAULT; |
0b99d589 | 2146 | |
a44b508a | 2147 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2148 | |
2149 | /* | |
2150 | * Handle transistions to and from RTS Toggle. | |
2151 | */ | |
851f306d CM |
2152 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2153 | (new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 | 2154 | ch->ch_mostat &= ~(UART_MCR_RTS); |
851f306d CM |
2155 | if ((ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2156 | !(new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 LL |
2157 | ch->ch_mostat |= (UART_MCR_RTS); |
2158 | ||
2159 | /* | |
2160 | * Handle transistions to and from DTR Toggle. | |
2161 | */ | |
851f306d CM |
2162 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2163 | (new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 | 2164 | ch->ch_mostat &= ~(UART_MCR_DTR); |
851f306d CM |
2165 | if ((ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2166 | !(new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 LL |
2167 | ch->ch_mostat |= (UART_MCR_DTR); |
2168 | ||
a07bf39a | 2169 | memcpy(&ch->ch_digi, &new_digi, sizeof(new_digi)); |
0b99d589 | 2170 | |
8b07d521 | 2171 | if (ch->ch_digi.digi_maxcps < 1) |
0b99d589 LL |
2172 | ch->ch_digi.digi_maxcps = 1; |
2173 | ||
8b07d521 | 2174 | if (ch->ch_digi.digi_maxcps > 10000) |
0b99d589 LL |
2175 | ch->ch_digi.digi_maxcps = 10000; |
2176 | ||
2177 | if (ch->ch_digi.digi_bufsize < 10) | |
2178 | ch->ch_digi.digi_bufsize = 10; | |
2179 | ||
2180 | if (ch->ch_digi.digi_maxchar < 1) | |
2181 | ch->ch_digi.digi_maxchar = 1; | |
2182 | ||
2183 | if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize) | |
2184 | ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize; | |
2185 | ||
2186 | if (ch->ch_digi.digi_onlen > DIGI_PLEN) | |
2187 | ch->ch_digi.digi_onlen = DIGI_PLEN; | |
2188 | ||
2189 | if (ch->ch_digi.digi_offlen > DIGI_PLEN) | |
2190 | ch->ch_digi.digi_offlen = DIGI_PLEN; | |
2191 | ||
2192 | ch->ch_bd->bd_ops->param(tty); | |
2193 | ||
a44b508a | 2194 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2195 | |
8f90ef80 | 2196 | return 0; |
0b99d589 LL |
2197 | } |
2198 | ||
0b99d589 LL |
2199 | /* |
2200 | * dgnc_set_termios() | |
2201 | */ | |
851f306d CM |
2202 | static void dgnc_tty_set_termios(struct tty_struct *tty, |
2203 | struct ktermios *old_termios) | |
0b99d589 | 2204 | { |
03425f55 | 2205 | struct dgnc_board *bd; |
0b99d589 LL |
2206 | struct channel_t *ch; |
2207 | struct un_t *un; | |
a44b508a | 2208 | unsigned long flags; |
0b99d589 LL |
2209 | |
2210 | if (!tty || tty->magic != TTY_MAGIC) | |
2211 | return; | |
2212 | ||
2213 | un = tty->driver_data; | |
2214 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2215 | return; | |
2216 | ||
2217 | ch = un->un_ch; | |
2218 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2219 | return; | |
2220 | ||
2221 | bd = ch->ch_bd; | |
2222 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2223 | return; | |
2224 | ||
a44b508a | 2225 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2226 | |
22e3de76 LL |
2227 | ch->ch_c_cflag = tty->termios.c_cflag; |
2228 | ch->ch_c_iflag = tty->termios.c_iflag; | |
2229 | ch->ch_c_oflag = tty->termios.c_oflag; | |
2230 | ch->ch_c_lflag = tty->termios.c_lflag; | |
2231 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
2232 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
2233 | |
2234 | ch->ch_bd->bd_ops->param(tty); | |
2235 | dgnc_carrier(ch); | |
2236 | ||
a44b508a | 2237 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2238 | } |
2239 | ||
0b99d589 LL |
2240 | static void dgnc_tty_throttle(struct tty_struct *tty) |
2241 | { | |
2242 | struct channel_t *ch; | |
2243 | struct un_t *un; | |
a44b508a | 2244 | unsigned long flags; |
0b99d589 LL |
2245 | |
2246 | if (!tty || tty->magic != TTY_MAGIC) | |
2247 | return; | |
2248 | ||
2249 | un = tty->driver_data; | |
2250 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2251 | return; | |
8b07d521 | 2252 | |
90d2a471 LL |
2253 | ch = un->un_ch; |
2254 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2255 | return; | |
0b99d589 | 2256 | |
a44b508a | 2257 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2258 | |
2259 | ch->ch_flags |= (CH_FORCED_STOPI); | |
2260 | ||
a44b508a | 2261 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2262 | } |
2263 | ||
0b99d589 LL |
2264 | static void dgnc_tty_unthrottle(struct tty_struct *tty) |
2265 | { | |
2266 | struct channel_t *ch; | |
2267 | struct un_t *un; | |
a44b508a | 2268 | unsigned long flags; |
0b99d589 LL |
2269 | |
2270 | if (!tty || tty->magic != TTY_MAGIC) | |
2271 | return; | |
2272 | ||
2273 | un = tty->driver_data; | |
2274 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2275 | return; | |
8b07d521 | 2276 | |
90d2a471 LL |
2277 | ch = un->un_ch; |
2278 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2279 | return; | |
0b99d589 | 2280 | |
a44b508a | 2281 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2282 | |
2283 | ch->ch_flags &= ~(CH_FORCED_STOPI); | |
2284 | ||
a44b508a | 2285 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2286 | } |
2287 | ||
0b99d589 LL |
2288 | static void dgnc_tty_start(struct tty_struct *tty) |
2289 | { | |
03425f55 | 2290 | struct dgnc_board *bd; |
0b99d589 LL |
2291 | struct channel_t *ch; |
2292 | struct un_t *un; | |
a44b508a | 2293 | unsigned long flags; |
0b99d589 LL |
2294 | |
2295 | if (!tty || tty->magic != TTY_MAGIC) | |
2296 | return; | |
2297 | ||
2298 | un = tty->driver_data; | |
2299 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2300 | return; | |
8b07d521 | 2301 | |
90d2a471 LL |
2302 | ch = un->un_ch; |
2303 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2304 | return; | |
0b99d589 LL |
2305 | |
2306 | bd = ch->ch_bd; | |
2307 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2308 | return; | |
2309 | ||
a44b508a | 2310 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2311 | |
2312 | ch->ch_flags &= ~(CH_FORCED_STOP); | |
2313 | ||
a44b508a | 2314 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2315 | } |
2316 | ||
0b99d589 LL |
2317 | static void dgnc_tty_stop(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 | ch->ch_flags |= (CH_FORCED_STOP); | |
2342 | ||
a44b508a | 2343 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2344 | } |
2345 | ||
8b07d521 | 2346 | /* |
0b99d589 LL |
2347 | * dgnc_tty_flush_chars() |
2348 | * | |
2349 | * Flush the cook buffer | |
2350 | * | |
2351 | * Note to self, and any other poor souls who venture here: | |
2352 | * | |
2353 | * flush in this case DOES NOT mean dispose of the data. | |
2354 | * instead, it means "stop buffering and send it if you | |
2355 | * haven't already." Just guess how I figured that out... SRW 2-Jun-98 | |
2356 | * | |
2357 | * It is also always called in interrupt context - JAR 8-Sept-99 | |
2358 | */ | |
2359 | static void dgnc_tty_flush_chars(struct tty_struct *tty) | |
2360 | { | |
03425f55 | 2361 | struct dgnc_board *bd; |
0b99d589 LL |
2362 | struct channel_t *ch; |
2363 | struct un_t *un; | |
a44b508a | 2364 | unsigned long flags; |
0b99d589 LL |
2365 | |
2366 | if (!tty || tty->magic != TTY_MAGIC) | |
2367 | return; | |
2368 | ||
2369 | un = tty->driver_data; | |
2370 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2371 | return; | |
8b07d521 | 2372 | |
90d2a471 LL |
2373 | ch = un->un_ch; |
2374 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2375 | return; | |
0b99d589 LL |
2376 | |
2377 | bd = ch->ch_bd; | |
2378 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2379 | return; | |
2380 | ||
a44b508a | 2381 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2382 | |
2383 | /* Do something maybe here */ | |
2384 | ||
a44b508a | 2385 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2386 | } |
2387 | ||
0b99d589 LL |
2388 | /* |
2389 | * dgnc_tty_flush_buffer() | |
8b07d521 | 2390 | * |
0b99d589 LL |
2391 | * Flush Tx buffer (make in == out) |
2392 | */ | |
2393 | static void dgnc_tty_flush_buffer(struct tty_struct *tty) | |
2394 | { | |
2395 | struct channel_t *ch; | |
2396 | struct un_t *un; | |
a44b508a | 2397 | unsigned long flags; |
0b99d589 LL |
2398 | |
2399 | if (!tty || tty->magic != TTY_MAGIC) | |
2400 | return; | |
2401 | ||
2402 | un = tty->driver_data; | |
2403 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2404 | return; | |
8b07d521 | 2405 | |
90d2a471 LL |
2406 | ch = un->un_ch; |
2407 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2408 | return; | |
0b99d589 | 2409 | |
a44b508a | 2410 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2411 | |
2412 | ch->ch_flags &= ~CH_STOP; | |
2413 | ||
2414 | /* Flush our write queue */ | |
2415 | ch->ch_w_head = ch->ch_w_tail; | |
2416 | ||
2417 | /* Flush UARTs transmit FIFO */ | |
2418 | ch->ch_bd->bd_ops->flush_uart_write(ch); | |
2419 | ||
adcb56f9 RS |
2420 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
2421 | ch->ch_tun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2422 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2423 | } | |
adcb56f9 RS |
2424 | if (ch->ch_pun.un_flags & (UN_LOW | UN_EMPTY)) { |
2425 | ch->ch_pun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2426 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2427 | } | |
2428 | ||
a44b508a | 2429 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2430 | } |
2431 | ||
0b99d589 LL |
2432 | /***************************************************************************** |
2433 | * | |
2434 | * The IOCTL function and all of its helpers | |
2435 | * | |
2436 | *****************************************************************************/ | |
8b07d521 | 2437 | |
0b99d589 LL |
2438 | /* |
2439 | * dgnc_tty_ioctl() | |
2440 | * | |
2441 | * The usual assortment of ioctl's | |
2442 | */ | |
a31cefa2 | 2443 | static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
e352d3f1 | 2444 | unsigned long arg) |
0b99d589 | 2445 | { |
03425f55 | 2446 | struct dgnc_board *bd; |
8670a56f | 2447 | struct board_ops *ch_bd_ops; |
0b99d589 LL |
2448 | struct channel_t *ch; |
2449 | struct un_t *un; | |
2450 | int rc; | |
a44b508a | 2451 | unsigned long flags; |
6f418259 | 2452 | void __user *uarg = (void __user *)arg; |
0b99d589 LL |
2453 | |
2454 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2455 | return -ENODEV; |
0b99d589 LL |
2456 | |
2457 | un = tty->driver_data; | |
2458 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2459 | return -ENODEV; |
0b99d589 LL |
2460 | |
2461 | ch = un->un_ch; | |
2462 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2463 | return -ENODEV; |
0b99d589 LL |
2464 | |
2465 | bd = ch->ch_bd; | |
2466 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2467 | return -ENODEV; |
0b99d589 | 2468 | |
8670a56f DY |
2469 | ch_bd_ops = bd->bd_ops; |
2470 | ||
a44b508a | 2471 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2472 | |
2473 | if (un->un_open_count <= 0) { | |
a44b508a | 2474 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2475 | return -EIO; |
0b99d589 LL |
2476 | } |
2477 | ||
2478 | switch (cmd) { | |
0b99d589 LL |
2479 | /* Here are all the standard ioctl's that we MUST implement */ |
2480 | ||
2481 | case TCSBRK: | |
2482 | /* | |
8b07d521 | 2483 | * TCSBRK is SVID version: non-zero arg --> no break |
0b99d589 LL |
2484 | * this behaviour is exploited by tcdrain(). |
2485 | * | |
2486 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be | |
2487 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2488 | * in the middle: 0.375 seconds. | |
2489 | */ | |
2490 | rc = tty_check_change(tty); | |
a44b508a | 2491 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2492 | if (rc) |
8f90ef80 | 2493 | return rc; |
0b99d589 | 2494 | |
8670a56f | 2495 | rc = ch_bd_ops->drain(tty, 0); |
0b99d589 | 2496 | |
f1e51745 | 2497 | if (rc) |
8f90ef80 | 2498 | return -EINTR; |
0b99d589 | 2499 | |
a44b508a | 2500 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2501 | |
3c4019d3 | 2502 | if (((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP)) |
8670a56f | 2503 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2504 | |
a44b508a | 2505 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2506 | |
8f90ef80 | 2507 | return 0; |
0b99d589 | 2508 | |
0b99d589 | 2509 | case TCSBRKP: |
90d2a471 | 2510 | /* support for POSIX tcsendbreak() |
0b99d589 LL |
2511 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be |
2512 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2513 | * in the middle: 0.375 seconds. | |
2514 | */ | |
2515 | rc = tty_check_change(tty); | |
a44b508a | 2516 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2517 | if (rc) |
8f90ef80 | 2518 | return rc; |
0b99d589 | 2519 | |
8670a56f | 2520 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2521 | if (rc) |
8f90ef80 | 2522 | return -EINTR; |
0b99d589 | 2523 | |
a44b508a | 2524 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2525 | |
8670a56f | 2526 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2527 | |
a44b508a | 2528 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2529 | |
8f90ef80 | 2530 | return 0; |
0b99d589 LL |
2531 | |
2532 | case TIOCSBRK: | |
2533 | rc = tty_check_change(tty); | |
a44b508a | 2534 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2535 | if (rc) |
8f90ef80 | 2536 | return rc; |
0b99d589 | 2537 | |
8670a56f | 2538 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2539 | if (rc) |
8f90ef80 | 2540 | return -EINTR; |
0b99d589 | 2541 | |
a44b508a | 2542 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2543 | |
8670a56f | 2544 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2545 | |
a44b508a | 2546 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2547 | |
8f90ef80 | 2548 | return 0; |
0b99d589 LL |
2549 | |
2550 | case TIOCCBRK: | |
2551 | /* Do Nothing */ | |
a44b508a | 2552 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2553 | return 0; |
2554 | ||
2555 | case TIOCGSOFTCAR: | |
2556 | ||
a44b508a | 2557 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2558 | |
106d43f1 RS |
2559 | return put_user(C_CLOCAL(tty) ? 1 : 0, |
2560 | (unsigned long __user *)arg); | |
0b99d589 LL |
2561 | |
2562 | case TIOCSSOFTCAR: | |
2563 | ||
a44b508a | 2564 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2565 | rc = get_user(arg, (unsigned long __user *)arg); |
0b99d589 | 2566 | if (rc) |
8f90ef80 | 2567 | return rc; |
0b99d589 | 2568 | |
a44b508a | 2569 | spin_lock_irqsave(&ch->ch_lock, flags); |
851f306d CM |
2570 | tty->termios.c_cflag = ((tty->termios.c_cflag & ~CLOCAL) | |
2571 | (arg ? CLOCAL : 0)); | |
8670a56f | 2572 | ch_bd_ops->param(tty); |
a44b508a | 2573 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2574 | |
8f90ef80 | 2575 | return 0; |
8b07d521 | 2576 | |
0b99d589 | 2577 | case TIOCMGET: |
a44b508a | 2578 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2579 | return dgnc_get_modem_info(ch, uarg); |
0b99d589 LL |
2580 | |
2581 | case TIOCMBIS: | |
2582 | case TIOCMBIC: | |
2583 | case TIOCMSET: | |
a44b508a | 2584 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
c23b48e0 | 2585 | return dgnc_set_modem_info(ch, cmd, uarg); |
0b99d589 LL |
2586 | |
2587 | /* | |
2588 | * Here are any additional ioctl's that we want to implement | |
2589 | */ | |
8b07d521 LL |
2590 | |
2591 | case TCFLSH: | |
0b99d589 LL |
2592 | /* |
2593 | * The linux tty driver doesn't have a flush | |
2594 | * input routine for the driver, assuming all backed | |
2595 | * up data is in the line disc. buffers. However, | |
2596 | * we all know that's not the case. Here, we | |
2597 | * act on the ioctl, but then lie and say we didn't | |
2598 | * so the line discipline will process the flush | |
2599 | * also. | |
8b07d521 | 2600 | */ |
0b99d589 LL |
2601 | rc = tty_check_change(tty); |
2602 | if (rc) { | |
a44b508a | 2603 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2604 | return rc; |
0b99d589 LL |
2605 | } |
2606 | ||
2607 | if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) { | |
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 | if ((arg == TCOFLUSH) || (arg == TCIOFLUSH)) { | |
2615 | if (!(un->un_type == DGNC_PRINT)) { | |
2616 | ch->ch_w_head = ch->ch_w_tail; | |
8670a56f | 2617 | ch_bd_ops->flush_uart_write(ch); |
0b99d589 | 2618 | |
24039c58 | 2619 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
851f306d | 2620 | ch->ch_tun.un_flags &= |
adcb56f9 | 2621 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2622 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2623 | } | |
2624 | ||
2625 | if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) { | |
851f306d | 2626 | ch->ch_pun.un_flags &= |
adcb56f9 | 2627 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2628 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2629 | } | |
0b99d589 LL |
2630 | } |
2631 | } | |
2632 | ||
8b07d521 | 2633 | /* pretend we didn't recognize this IOCTL */ |
a44b508a | 2634 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2635 | return -ENOIOCTLCMD; |
0b99d589 LL |
2636 | case TCSETSF: |
2637 | case TCSETSW: | |
2638 | /* | |
2639 | * The linux tty driver doesn't have a flush | |
2640 | * input routine for the driver, assuming all backed | |
2641 | * up data is in the line disc. buffers. However, | |
2642 | * we all know that's not the case. Here, we | |
2643 | * act on the ioctl, but then lie and say we didn't | |
2644 | * so the line discipline will process the flush | |
2645 | * also. | |
2646 | */ | |
2647 | if (cmd == TCSETSF) { | |
2648 | /* flush rx */ | |
2649 | ch->ch_flags &= ~CH_STOP; | |
2650 | ch->ch_r_head = ch->ch_r_tail; | |
8670a56f | 2651 | ch_bd_ops->flush_uart_read(ch); |
0b99d589 LL |
2652 | /* Force queue flow control to be released, if needed */ |
2653 | dgnc_check_queue_flow_control(ch); | |
2654 | } | |
2655 | ||
2656 | /* now wait for all the output to drain */ | |
a44b508a | 2657 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2658 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2659 | if (rc) |
8f90ef80 | 2660 | return -EINTR; |
0b99d589 LL |
2661 | |
2662 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2663 | return -ENOIOCTLCMD; |
0b99d589 LL |
2664 | |
2665 | case TCSETAW: | |
2666 | ||
a44b508a | 2667 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2668 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2669 | if (rc) |
8f90ef80 | 2670 | return -EINTR; |
0b99d589 LL |
2671 | |
2672 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2673 | return -ENOIOCTLCMD; |
0b99d589 LL |
2674 | |
2675 | case TCXONC: | |
a44b508a | 2676 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2677 | /* Make the ld do it */ |
8f90ef80 | 2678 | return -ENOIOCTLCMD; |
0b99d589 LL |
2679 | |
2680 | case DIGI_GETA: | |
2681 | /* get information for ditty */ | |
a44b508a | 2682 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2683 | return dgnc_tty_digigeta(tty, uarg); |
0b99d589 LL |
2684 | |
2685 | case DIGI_SETAW: | |
2686 | case DIGI_SETAF: | |
2687 | ||
2688 | /* set information for ditty */ | |
2689 | if (cmd == (DIGI_SETAW)) { | |
a44b508a | 2690 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2691 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 SL |
2692 | |
2693 | if (rc) | |
8f90ef80 | 2694 | return -EINTR; |
f1e51745 | 2695 | |
a44b508a | 2696 | spin_lock_irqsave(&ch->ch_lock, flags); |
2000c581 | 2697 | } else { |
0b99d589 LL |
2698 | tty_ldisc_flush(tty); |
2699 | } | |
2700 | /* fall thru */ | |
2701 | ||
2702 | case DIGI_SETA: | |
a44b508a | 2703 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2704 | return dgnc_tty_digiseta(tty, uarg); |
8b07d521 | 2705 | |
0b99d589 LL |
2706 | case DIGI_LOOPBACK: |
2707 | { | |
2708 | uint loopback = 0; | |
851f306d CM |
2709 | /* Let go of locks when accessing user space, |
2710 | * could sleep | |
2711 | */ | |
a44b508a | 2712 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2713 | rc = get_user(loopback, (unsigned int __user *)arg); |
0b99d589 | 2714 | if (rc) |
8f90ef80 | 2715 | return rc; |
a44b508a | 2716 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2717 | |
8b07d521 | 2718 | /* Enable/disable internal loopback for this port */ |
0b99d589 LL |
2719 | if (loopback) |
2720 | ch->ch_flags |= CH_LOOPBACK; | |
2721 | else | |
2722 | ch->ch_flags &= ~(CH_LOOPBACK); | |
2723 | ||
8670a56f | 2724 | ch_bd_ops->param(tty); |
a44b508a | 2725 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2726 | return 0; |
90d2a471 | 2727 | } |
0b99d589 LL |
2728 | |
2729 | case DIGI_GETCUSTOMBAUD: | |
a44b508a | 2730 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
106d43f1 RS |
2731 | return put_user(ch->ch_custom_speed, |
2732 | (unsigned int __user *)arg); | |
0b99d589 LL |
2733 | |
2734 | case DIGI_SETCUSTOMBAUD: | |
2735 | { | |
93c76c9c | 2736 | int new_rate; |
0b99d589 | 2737 | /* Let go of locks when accessing user space, could sleep */ |
a44b508a | 2738 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2739 | rc = get_user(new_rate, (int __user *)arg); |
0b99d589 | 2740 | if (rc) |
8f90ef80 | 2741 | return rc; |
a44b508a | 2742 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2743 | dgnc_set_custom_speed(ch, new_rate); |
8670a56f | 2744 | ch_bd_ops->param(tty); |
a44b508a | 2745 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2746 | return 0; |
90d2a471 | 2747 | } |
0b99d589 LL |
2748 | |
2749 | /* | |
2750 | * This ioctl allows insertion of a character into the front | |
2751 | * of any pending data to be transmitted. | |
2752 | * | |
2753 | * This ioctl is to satify the "Send Character Immediate" | |
2754 | * call that the RealPort protocol spec requires. | |
2755 | */ | |
2756 | case DIGI_REALPORT_SENDIMMEDIATE: | |
2757 | { | |
2758 | unsigned char c; | |
0eaa02e6 | 2759 | |
a44b508a | 2760 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2761 | rc = get_user(c, (unsigned char __user *)arg); |
0b99d589 | 2762 | if (rc) |
8f90ef80 | 2763 | return rc; |
a44b508a | 2764 | spin_lock_irqsave(&ch->ch_lock, flags); |
8670a56f | 2765 | ch_bd_ops->send_immediate_char(ch, c); |
a44b508a | 2766 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2767 | return 0; |
0b99d589 LL |
2768 | } |
2769 | ||
2770 | /* | |
2771 | * This ioctl returns all the current counts for the port. | |
2772 | * | |
2773 | * This ioctl is to satify the "Line Error Counters" | |
2774 | * call that the RealPort protocol spec requires. | |
2775 | */ | |
2776 | case DIGI_REALPORT_GETCOUNTERS: | |
2777 | { | |
2778 | struct digi_getcounter buf; | |
2779 | ||
2780 | buf.norun = ch->ch_err_overrun; | |
feba47a7 | 2781 | buf.noflow = 0; /* The driver doesn't keep this stat */ |
0b99d589 LL |
2782 | buf.nframe = ch->ch_err_frame; |
2783 | buf.nparity = ch->ch_err_parity; | |
2784 | buf.nbreak = ch->ch_err_break; | |
2785 | buf.rbytes = ch->ch_rxcount; | |
2786 | buf.tbytes = ch->ch_txcount; | |
2787 | ||
a44b508a | 2788 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2789 | |
50667c67 | 2790 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2791 | return -EFAULT; |
50667c67 | 2792 | |
8f90ef80 | 2793 | return 0; |
0b99d589 LL |
2794 | } |
2795 | ||
2796 | /* | |
2797 | * This ioctl returns all current events. | |
2798 | * | |
2799 | * This ioctl is to satify the "Event Reporting" | |
2800 | * call that the RealPort protocol spec requires. | |
90d2a471 | 2801 | */ |
0b99d589 LL |
2802 | case DIGI_REALPORT_GETEVENTS: |
2803 | { | |
2804 | unsigned int events = 0; | |
2805 | ||
2806 | /* NOTE: MORE EVENTS NEEDS TO BE ADDED HERE */ | |
2807 | if (ch->ch_flags & CH_BREAK_SENDING) | |
2808 | events |= EV_TXB; | |
851f306d CM |
2809 | if ((ch->ch_flags & CH_STOP) || |
2810 | (ch->ch_flags & CH_FORCED_STOP)) | |
0b99d589 | 2811 | events |= (EV_OPU | EV_OPS); |
50667c67 | 2812 | |
851f306d CM |
2813 | if ((ch->ch_flags & CH_STOPI) || |
2814 | (ch->ch_flags & CH_FORCED_STOPI)) | |
0b99d589 | 2815 | events |= (EV_IPU | EV_IPS); |
0b99d589 | 2816 | |
a44b508a | 2817 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
106d43f1 | 2818 | return put_user(events, (unsigned int __user *)arg); |
0b99d589 LL |
2819 | } |
2820 | ||
2821 | /* | |
2822 | * This ioctl returns TOUT and TIN counters based | |
2823 | * upon the values passed in by the RealPort Server. | |
2824 | * It also passes back whether the UART Transmitter is | |
2825 | * empty as well. | |
90d2a471 | 2826 | */ |
0b99d589 LL |
2827 | case DIGI_REALPORT_GETBUFFERS: |
2828 | { | |
2829 | struct digi_getbuffer buf; | |
2830 | int tdist; | |
2831 | int count; | |
2832 | ||
a44b508a | 2833 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2834 | |
2835 | /* | |
2836 | * Get data from user first. | |
2837 | */ | |
50667c67 | 2838 | if (copy_from_user(&buf, uarg, sizeof(buf))) |
8f90ef80 | 2839 | return -EFAULT; |
0b99d589 | 2840 | |
a44b508a | 2841 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2842 | |
2843 | /* | |
2844 | * Figure out how much data is in our RX and TX queues. | |
2845 | */ | |
2846 | buf.rxbuf = (ch->ch_r_head - ch->ch_r_tail) & RQUEUEMASK; | |
2847 | buf.txbuf = (ch->ch_w_head - ch->ch_w_tail) & WQUEUEMASK; | |
2848 | ||
2849 | /* | |
2850 | * Is the UART empty? Add that value to whats in our TX queue. | |
2851 | */ | |
8670a56f | 2852 | count = buf.txbuf + ch_bd_ops->get_uart_bytes_left(ch); |
0b99d589 LL |
2853 | |
2854 | /* | |
2855 | * Figure out how much data the RealPort Server believes should | |
2856 | * be in our TX queue. | |
2857 | */ | |
b9f84637 | 2858 | tdist = (buf.tx_in - buf.tx_out) & 0xffff; |
0b99d589 LL |
2859 | |
2860 | /* | |
2861 | * If we have more data than the RealPort Server believes we | |
2862 | * should have, reduce our count to its amount. | |
2863 | * | |
2864 | * This count difference CAN happen because the Linux LD can | |
2865 | * insert more characters into our queue for OPOST processing | |
2866 | * that the RealPort Server doesn't know about. | |
2867 | */ | |
50667c67 | 2868 | if (buf.txbuf > tdist) |
0b99d589 | 2869 | buf.txbuf = tdist; |
0b99d589 LL |
2870 | |
2871 | /* | |
2872 | * Report whether our queue and UART TX are completely empty. | |
2873 | */ | |
50667c67 | 2874 | if (count) |
0b99d589 | 2875 | buf.txdone = 0; |
50667c67 | 2876 | else |
0b99d589 | 2877 | buf.txdone = 1; |
0b99d589 | 2878 | |
a44b508a | 2879 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2880 | |
50667c67 | 2881 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2882 | return -EFAULT; |
50667c67 | 2883 | |
8f90ef80 | 2884 | return 0; |
0b99d589 LL |
2885 | } |
2886 | default: | |
a44b508a | 2887 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2888 | |
8f90ef80 | 2889 | return -ENOIOCTLCMD; |
0b99d589 | 2890 | } |
0b99d589 | 2891 | } |