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