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Commit | Line | Data |
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0b99d589 LL |
1 | /* |
2 | * Copyright 2003 Digi International (www.digi.com) | |
3 | * Scott H Kilau <Scott_Kilau at digi dot com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2, or (at your option) | |
8 | * any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the | |
12 | * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR | |
13 | * PURPOSE. See the GNU General Public License for more details. | |
0b99d589 LL |
14 | */ |
15 | ||
7127fa28 | 16 | /* |
0b99d589 LL |
17 | * This file implements the tty driver functionality for the |
18 | * Neo and ClassicBoard PCI based product lines. | |
0b99d589 LL |
19 | */ |
20 | ||
21 | #include <linux/kernel.h> | |
0b99d589 LL |
22 | #include <linux/sched.h> /* For jiffies, task states */ |
23 | #include <linux/interrupt.h> /* For tasklet and interrupt structs/defines */ | |
24 | #include <linux/module.h> | |
25 | #include <linux/ctype.h> | |
26 | #include <linux/tty.h> | |
27 | #include <linux/tty_flip.h> | |
d533a524 | 28 | #include <linux/types.h> |
0b99d589 LL |
29 | #include <linux/serial_reg.h> |
30 | #include <linux/slab.h> | |
90d2a471 | 31 | #include <linux/delay.h> /* For udelay */ |
fb33cac8 | 32 | #include <linux/uaccess.h> /* For copy_from_user/copy_to_user */ |
0b99d589 | 33 | #include <linux/pci.h> |
0b99d589 LL |
34 | #include "dgnc_driver.h" |
35 | #include "dgnc_tty.h" | |
0b99d589 LL |
36 | #include "dgnc_neo.h" |
37 | #include "dgnc_cls.h" | |
9a633d00 | 38 | #include "dgnc_utils.h" |
0b99d589 | 39 | |
7127fa28 WF |
40 | /* Default transparent print information. */ |
41 | ||
d44e0e5d | 42 | static const struct digi_t dgnc_digi_init = { |
7127fa28 WF |
43 | .digi_flags = DIGI_COOK, /* Flags */ |
44 | .digi_maxcps = 100, /* Max CPS */ | |
45 | .digi_maxchar = 50, /* Max chars in print queue */ | |
46 | .digi_bufsize = 100, /* Printer buffer size */ | |
47 | .digi_onlen = 4, /* size of printer on string */ | |
48 | .digi_offlen = 4, /* size of printer off string */ | |
49 | .digi_onstr = "\033[5i", /* ANSI printer on string ] */ | |
50 | .digi_offstr = "\033[4i", /* ANSI printer off string ] */ | |
51 | .digi_term = "ansi" /* default terminal type */ | |
0b99d589 LL |
52 | }; |
53 | ||
0b99d589 LL |
54 | /* |
55 | * Define a local default termios struct. All ports will be created | |
56 | * with this termios initially. | |
57 | * | |
58 | * This defines a raw port at 9600 baud, 8 data bits, no parity, | |
59 | * 1 stop bit. | |
60 | */ | |
4efdb370 | 61 | static struct ktermios default_termios = { |
0b99d589 LL |
62 | .c_iflag = (DEFAULT_IFLAGS), /* iflags */ |
63 | .c_oflag = (DEFAULT_OFLAGS), /* oflags */ | |
64 | .c_cflag = (DEFAULT_CFLAGS), /* cflags */ | |
65 | .c_lflag = (DEFAULT_LFLAGS), /* lflags */ | |
66 | .c_cc = INIT_C_CC, | |
67 | .c_line = 0, | |
68 | }; | |
69 | ||
0b99d589 LL |
70 | /* Our function prototypes */ |
71 | static int dgnc_tty_open(struct tty_struct *tty, struct file *file); | |
72 | static void dgnc_tty_close(struct tty_struct *tty, struct file *file); | |
851f306d CM |
73 | static int dgnc_block_til_ready(struct tty_struct *tty, struct file *file, |
74 | struct channel_t *ch); | |
75 | static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, | |
76 | unsigned long arg); | |
77 | static int dgnc_tty_digigeta(struct tty_struct *tty, | |
78 | struct digi_t __user *retinfo); | |
79 | static int dgnc_tty_digiseta(struct tty_struct *tty, | |
80 | struct digi_t __user *new_info); | |
58b905b3 | 81 | static int dgnc_tty_write_room(struct tty_struct *tty); |
0b99d589 | 82 | static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c); |
58b905b3 | 83 | static int dgnc_tty_chars_in_buffer(struct tty_struct *tty); |
0b99d589 LL |
84 | static void dgnc_tty_start(struct tty_struct *tty); |
85 | static void dgnc_tty_stop(struct tty_struct *tty); | |
86 | static void dgnc_tty_throttle(struct tty_struct *tty); | |
87 | static void dgnc_tty_unthrottle(struct tty_struct *tty); | |
88 | static void dgnc_tty_flush_chars(struct tty_struct *tty); | |
89 | static void dgnc_tty_flush_buffer(struct tty_struct *tty); | |
90 | static void dgnc_tty_hangup(struct tty_struct *tty); | |
c23b48e0 | 91 | static int dgnc_set_modem_info(struct channel_t *ch, unsigned int command, |
851f306d CM |
92 | unsigned int __user *value); |
93 | static int dgnc_get_modem_info(struct channel_t *ch, | |
94 | unsigned int __user *value); | |
0b99d589 | 95 | static int dgnc_tty_tiocmget(struct tty_struct *tty); |
851f306d CM |
96 | static int dgnc_tty_tiocmset(struct tty_struct *tty, unsigned int set, |
97 | unsigned int clear); | |
0b99d589 LL |
98 | static int dgnc_tty_send_break(struct tty_struct *tty, int msec); |
99 | static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout); | |
851f306d CM |
100 | static int dgnc_tty_write(struct tty_struct *tty, const unsigned char *buf, |
101 | int count); | |
102 | static void dgnc_tty_set_termios(struct tty_struct *tty, | |
103 | struct ktermios *old_termios); | |
0b99d589 LL |
104 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char ch); |
105 | ||
0b99d589 LL |
106 | static const struct tty_operations dgnc_tty_ops = { |
107 | .open = dgnc_tty_open, | |
108 | .close = dgnc_tty_close, | |
109 | .write = dgnc_tty_write, | |
110 | .write_room = dgnc_tty_write_room, | |
111 | .flush_buffer = dgnc_tty_flush_buffer, | |
112 | .chars_in_buffer = dgnc_tty_chars_in_buffer, | |
113 | .flush_chars = dgnc_tty_flush_chars, | |
114 | .ioctl = dgnc_tty_ioctl, | |
115 | .set_termios = dgnc_tty_set_termios, | |
116 | .stop = dgnc_tty_stop, | |
117 | .start = dgnc_tty_start, | |
118 | .throttle = dgnc_tty_throttle, | |
119 | .unthrottle = dgnc_tty_unthrottle, | |
120 | .hangup = dgnc_tty_hangup, | |
121 | .put_char = dgnc_tty_put_char, | |
122 | .tiocmget = dgnc_tty_tiocmget, | |
123 | .tiocmset = dgnc_tty_tiocmset, | |
124 | .break_ctl = dgnc_tty_send_break, | |
125 | .wait_until_sent = dgnc_tty_wait_until_sent, | |
126 | .send_xchar = dgnc_tty_send_xchar | |
127 | }; | |
128 | ||
7127fa28 | 129 | /* TTY Initialization/Cleanup Functions */ |
8b07d521 | 130 | |
0b99d589 LL |
131 | /* |
132 | * dgnc_tty_register() | |
133 | * | |
134 | * Init the tty subsystem for this board. | |
135 | */ | |
03425f55 | 136 | int dgnc_tty_register(struct dgnc_board *brd) |
0b99d589 | 137 | { |
60b3109e | 138 | int rc; |
8b07d521 | 139 | |
60b3109e DY |
140 | brd->serial_driver = tty_alloc_driver(brd->maxports, |
141 | TTY_DRIVER_REAL_RAW | | |
142 | TTY_DRIVER_DYNAMIC_DEV | | |
143 | TTY_DRIVER_HARDWARE_BREAK); | |
0b99d589 | 144 | |
60b3109e DY |
145 | if (IS_ERR(brd->serial_driver)) |
146 | return PTR_ERR(brd->serial_driver); | |
0b99d589 | 147 | |
6841b2a0 CM |
148 | snprintf(brd->serial_name, MAXTTYNAMELEN, "tty_dgnc_%d_", |
149 | brd->boardnum); | |
0b99d589 | 150 | |
60b3109e DY |
151 | brd->serial_driver->name = brd->serial_name; |
152 | brd->serial_driver->name_base = 0; | |
153 | brd->serial_driver->major = 0; | |
154 | brd->serial_driver->minor_start = 0; | |
155 | brd->serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
156 | brd->serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
4efdb370 | 157 | brd->serial_driver->init_termios = default_termios; |
60b3109e | 158 | brd->serial_driver->driver_name = DRVSTR; |
0b99d589 | 159 | |
0b99d589 LL |
160 | /* |
161 | * Entry points for driver. Called by the kernel from | |
162 | * tty_io.c and n_tty.c. | |
163 | */ | |
60b3109e | 164 | tty_set_operations(brd->serial_driver, &dgnc_tty_ops); |
0b99d589 | 165 | |
1cd7c062 DY |
166 | rc = tty_register_driver(brd->serial_driver); |
167 | if (rc < 0) { | |
168 | dev_dbg(&brd->pdev->dev, | |
169 | "Can't register tty device (%d)\n", rc); | |
170 | goto free_serial_driver; | |
0b99d589 LL |
171 | } |
172 | ||
173 | /* | |
174 | * If we're doing transparent print, we have to do all of the above | |
79e30af2 | 175 | * again, separately so we don't get the LD confused about what major |
0b99d589 LL |
176 | * we are when we get into the dgnc_tty_open() routine. |
177 | */ | |
60b3109e DY |
178 | brd->print_driver = tty_alloc_driver(brd->maxports, |
179 | TTY_DRIVER_REAL_RAW | | |
180 | TTY_DRIVER_DYNAMIC_DEV | | |
181 | TTY_DRIVER_HARDWARE_BREAK); | |
0b99d589 | 182 | |
a0ca97b8 DY |
183 | if (IS_ERR(brd->print_driver)) { |
184 | rc = PTR_ERR(brd->print_driver); | |
185 | goto unregister_serial_driver; | |
186 | } | |
0b99d589 | 187 | |
60b3109e | 188 | snprintf(brd->print_name, MAXTTYNAMELEN, "pr_dgnc_%d_", brd->boardnum); |
0b99d589 | 189 | |
60b3109e DY |
190 | brd->print_driver->name = brd->print_name; |
191 | brd->print_driver->name_base = 0; | |
192 | brd->print_driver->major = brd->serial_driver->major; | |
193 | brd->print_driver->minor_start = 0x80; | |
194 | brd->print_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
195 | brd->print_driver->subtype = SERIAL_TYPE_NORMAL; | |
4efdb370 | 196 | brd->print_driver->init_termios = default_termios; |
60b3109e | 197 | brd->print_driver->driver_name = DRVSTR; |
0b99d589 | 198 | |
0b99d589 LL |
199 | /* |
200 | * Entry points for driver. Called by the kernel from | |
201 | * tty_io.c and n_tty.c. | |
202 | */ | |
60b3109e | 203 | tty_set_operations(brd->print_driver, &dgnc_tty_ops); |
0b99d589 | 204 | |
1cd7c062 DY |
205 | rc = tty_register_driver(brd->print_driver); |
206 | if (rc < 0) { | |
207 | dev_dbg(&brd->pdev->dev, | |
208 | "Can't register Transparent Print device(%d)\n", | |
209 | rc); | |
210 | goto free_print_driver; | |
0b99d589 LL |
211 | } |
212 | ||
60b3109e DY |
213 | return 0; |
214 | ||
215 | free_print_driver: | |
216 | put_tty_driver(brd->print_driver); | |
217 | unregister_serial_driver: | |
218 | tty_unregister_driver(brd->serial_driver); | |
219 | free_serial_driver: | |
220 | put_tty_driver(brd->serial_driver); | |
0b99d589 | 221 | |
8f90ef80 | 222 | return rc; |
0b99d589 LL |
223 | } |
224 | ||
eea5fd11 DY |
225 | void dgnc_tty_unregister(struct dgnc_board *brd) |
226 | { | |
227 | tty_unregister_driver(brd->print_driver); | |
228 | tty_unregister_driver(brd->serial_driver); | |
229 | put_tty_driver(brd->print_driver); | |
230 | put_tty_driver(brd->serial_driver); | |
231 | } | |
232 | ||
0b99d589 LL |
233 | /* |
234 | * dgnc_tty_init() | |
235 | * | |
236 | * Init the tty subsystem. Called once per board after board has been | |
237 | * downloaded and init'ed. | |
238 | */ | |
03425f55 | 239 | int dgnc_tty_init(struct dgnc_board *brd) |
0b99d589 LL |
240 | { |
241 | int i; | |
a7a75386 | 242 | void __iomem *vaddr; |
0b99d589 LL |
243 | struct channel_t *ch; |
244 | ||
245 | if (!brd) | |
8f90ef80 | 246 | return -ENXIO; |
0b99d589 | 247 | |
7127fa28 | 248 | /* Initialize board structure elements. */ |
0b99d589 LL |
249 | |
250 | vaddr = brd->re_map_membase; | |
251 | ||
252 | brd->nasync = brd->maxports; | |
253 | ||
0b99d589 | 254 | for (i = 0; i < brd->nasync; i++) { |
fa52d96c GS |
255 | /* |
256 | * Okay to malloc with GFP_KERNEL, we are not at | |
257 | * interrupt context, and there are no locks held. | |
258 | */ | |
259 | brd->channels[i] = kzalloc(sizeof(*brd->channels[i]), | |
260 | GFP_KERNEL); | |
261 | if (!brd->channels[i]) | |
262 | goto err_free_channels; | |
0b99d589 LL |
263 | } |
264 | ||
265 | ch = brd->channels[0]; | |
266 | vaddr = brd->re_map_membase; | |
267 | ||
268 | /* Set up channel variables */ | |
269 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
a44b508a | 270 | spin_lock_init(&ch->ch_lock); |
0b99d589 LL |
271 | |
272 | /* Store all our magic numbers */ | |
273 | ch->magic = DGNC_CHANNEL_MAGIC; | |
274 | ch->ch_tun.magic = DGNC_UNIT_MAGIC; | |
275 | ch->ch_tun.un_ch = ch; | |
276 | ch->ch_tun.un_type = DGNC_SERIAL; | |
277 | ch->ch_tun.un_dev = i; | |
278 | ||
279 | ch->ch_pun.magic = DGNC_UNIT_MAGIC; | |
280 | ch->ch_pun.un_ch = ch; | |
281 | ch->ch_pun.un_type = DGNC_PRINT; | |
282 | ch->ch_pun.un_dev = i + 128; | |
283 | ||
284 | if (brd->bd_uart_offset == 0x200) | |
a7a75386 | 285 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 | 286 | else |
a7a75386 | 287 | ch->ch_cls_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 LL |
288 | |
289 | ch->ch_bd = brd; | |
290 | ch->ch_portnum = i; | |
291 | ch->ch_digi = dgnc_digi_init; | |
292 | ||
293 | /* .25 second delay */ | |
294 | ch->ch_close_delay = 250; | |
295 | ||
296 | init_waitqueue_head(&ch->ch_flags_wait); | |
297 | init_waitqueue_head(&ch->ch_tun.un_flags_wait); | |
298 | init_waitqueue_head(&ch->ch_pun.un_flags_wait); | |
0b99d589 LL |
299 | |
300 | { | |
301 | struct device *classp; | |
0eaa02e6 | 302 | |
60b3109e | 303 | classp = tty_register_device(brd->serial_driver, i, |
7df227c4 | 304 | &ch->ch_bd->pdev->dev); |
0b99d589 | 305 | ch->ch_tun.un_sysfs = classp; |
0b99d589 | 306 | |
60b3109e | 307 | classp = tty_register_device(brd->print_driver, i, |
7df227c4 | 308 | &ch->ch_bd->pdev->dev); |
0b99d589 | 309 | ch->ch_pun.un_sysfs = classp; |
0b99d589 | 310 | } |
0b99d589 LL |
311 | } |
312 | ||
8f90ef80 | 313 | return 0; |
fa52d96c GS |
314 | |
315 | err_free_channels: | |
316 | for (i = i - 1; i >= 0; --i) { | |
317 | kfree(brd->channels[i]); | |
318 | brd->channels[i] = NULL; | |
319 | } | |
320 | return -ENOMEM; | |
0b99d589 LL |
321 | } |
322 | ||
0b99d589 | 323 | /* |
33ccb442 | 324 | * dgnc_cleanup_tty() |
0b99d589 LL |
325 | * |
326 | * Uninitialize the TTY portion of this driver. Free all memory and | |
8b07d521 | 327 | * resources. |
0b99d589 | 328 | */ |
33ccb442 | 329 | void dgnc_cleanup_tty(struct dgnc_board *brd) |
0b99d589 LL |
330 | { |
331 | int i = 0; | |
332 | ||
1eb388b6 | 333 | for (i = 0; i < brd->nasync; i++) |
1cd7c062 | 334 | tty_unregister_device(brd->serial_driver, i); |
1eb388b6 | 335 | |
1cd7c062 | 336 | tty_unregister_driver(brd->serial_driver); |
0b99d589 | 337 | |
1eb388b6 | 338 | for (i = 0; i < brd->nasync; i++) |
1cd7c062 | 339 | tty_unregister_device(brd->print_driver, i); |
1eb388b6 | 340 | |
1cd7c062 | 341 | tty_unregister_driver(brd->print_driver); |
0b99d589 | 342 | |
60b3109e DY |
343 | put_tty_driver(brd->serial_driver); |
344 | put_tty_driver(brd->print_driver); | |
0b99d589 LL |
345 | } |
346 | ||
8e8d27f7 | 347 | /* |
0b99d589 LL |
348 | * dgnc_wmove - Write data to transmit queue. |
349 | * | |
350 | * ch - Pointer to channel structure. | |
f7f2b10a | 351 | * buf - Pointer to characters to be moved. |
0b99d589 | 352 | * n - Number of characters to move. |
8e8d27f7 | 353 | */ |
0b99d589 LL |
354 | static void dgnc_wmove(struct channel_t *ch, char *buf, uint n) |
355 | { | |
356 | int remain; | |
357 | uint head; | |
358 | ||
359 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
360 | return; | |
8b07d521 | 361 | |
0b99d589 LL |
362 | head = ch->ch_w_head & WQUEUEMASK; |
363 | ||
364 | /* | |
365 | * If the write wraps over the top of the circular buffer, | |
366 | * move the portion up to the wrap point, and reset the | |
367 | * pointers to the bottom. | |
368 | */ | |
369 | remain = WQUEUESIZE - head; | |
370 | ||
371 | if (n >= remain) { | |
8b07d521 | 372 | n -= remain; |
0b99d589 LL |
373 | memcpy(ch->ch_wqueue + head, buf, remain); |
374 | head = 0; | |
375 | buf += remain; | |
376 | } | |
377 | ||
378 | if (n > 0) { | |
7127fa28 | 379 | /* Move rest of data. */ |
0b99d589 LL |
380 | remain = n; |
381 | memcpy(ch->ch_wqueue + head, buf, remain); | |
382 | head += remain; | |
383 | } | |
384 | ||
385 | head &= WQUEUEMASK; | |
386 | ch->ch_w_head = head; | |
387 | } | |
388 | ||
8e8d27f7 | 389 | /* |
0b99d589 | 390 | * dgnc_input - Process received data. |
8b07d521 | 391 | * |
90d2a471 | 392 | * ch - Pointer to channel structure. |
8e8d27f7 | 393 | */ |
0b99d589 LL |
394 | void dgnc_input(struct channel_t *ch) |
395 | { | |
03425f55 | 396 | struct dgnc_board *bd; |
0b99d589 | 397 | struct tty_struct *tp; |
c84a083b | 398 | struct tty_ldisc *ld = NULL; |
0b99d589 LL |
399 | uint rmask; |
400 | ushort head; | |
401 | ushort tail; | |
402 | int data_len; | |
a44b508a | 403 | unsigned long flags; |
0b99d589 LL |
404 | int flip_len; |
405 | int len = 0; | |
406 | int n = 0; | |
0b99d589 LL |
407 | int s = 0; |
408 | int i = 0; | |
409 | ||
410 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
411 | return; | |
412 | ||
413 | tp = ch->ch_tun.un_tty; | |
414 | ||
415 | bd = ch->ch_bd; | |
a82477c3 | 416 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
0b99d589 LL |
417 | return; |
418 | ||
a44b508a | 419 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 420 | |
8b07d521 LL |
421 | /* |
422 | * Figure the number of characters in the buffer. | |
0b99d589 LL |
423 | * Exit immediately if none. |
424 | */ | |
425 | rmask = RQUEUEMASK; | |
426 | head = ch->ch_r_head & rmask; | |
427 | tail = ch->ch_r_tail & rmask; | |
428 | data_len = (head - tail) & rmask; | |
429 | ||
c84a083b QL |
430 | if (data_len == 0) |
431 | goto exit_unlock; | |
0b99d589 | 432 | |
0b99d589 LL |
433 | /* |
434 | * If the device is not open, or CREAD is off, | |
90d2a471 | 435 | * flush input data and return immediately. |
0b99d589 | 436 | */ |
851f306d CM |
437 | if (!tp || (tp->magic != TTY_MAGIC) || |
438 | !(ch->ch_tun.un_flags & UN_ISOPEN) || | |
9db276f8 | 439 | !C_CREAD(tp) || |
851f306d | 440 | (ch->ch_tun.un_flags & UN_CLOSING)) { |
0b99d589 LL |
441 | ch->ch_r_head = tail; |
442 | ||
443 | /* Force queue flow control to be released, if needed */ | |
444 | dgnc_check_queue_flow_control(ch); | |
445 | ||
c84a083b | 446 | goto exit_unlock; |
0b99d589 LL |
447 | } |
448 | ||
7127fa28 WF |
449 | /* If we are throttled, simply don't read any data. */ |
450 | ||
c84a083b QL |
451 | if (ch->ch_flags & CH_FORCED_STOPI) |
452 | goto exit_unlock; | |
0b99d589 | 453 | |
100013fa | 454 | flip_len = TTY_FLIPBUF_SIZE; |
0b99d589 LL |
455 | |
456 | /* Chop down the length, if needed */ | |
457 | len = min(data_len, flip_len); | |
100013fa | 458 | len = min(len, (N_TTY_BUF_SIZE - 1)); |
0b99d589 LL |
459 | |
460 | ld = tty_ldisc_ref(tp); | |
461 | ||
0b99d589 LL |
462 | /* |
463 | * If we were unable to get a reference to the ld, | |
464 | * don't flush our buffer, and act like the ld doesn't | |
465 | * have any space to put the data right now. | |
466 | */ | |
467 | if (!ld) { | |
468 | len = 0; | |
469 | } else { | |
470 | /* | |
471 | * If ld doesn't have a pointer to a receive_buf function, | |
472 | * flush the data, then act like the ld doesn't have any | |
473 | * space to put the data right now. | |
474 | */ | |
475 | if (!ld->ops->receive_buf) { | |
476 | ch->ch_r_head = ch->ch_r_tail; | |
477 | len = 0; | |
8b07d521 | 478 | } |
0b99d589 LL |
479 | } |
480 | ||
c84a083b QL |
481 | if (len <= 0) |
482 | goto exit_unlock; | |
0b99d589 LL |
483 | |
484 | /* | |
485 | * The tty layer in the kernel has changed in 2.6.16+. | |
486 | * | |
487 | * The flip buffers in the tty structure are no longer exposed, | |
488 | * and probably will be going away eventually. | |
8b07d521 | 489 | * |
0b99d589 LL |
490 | * If we are completely raw, we don't need to go through a lot |
491 | * of the tty layers that exist. | |
492 | * In this case, we take the shortest and fastest route we | |
493 | * can to relay the data to the user. | |
494 | * | |
495 | * On the other hand, if we are not raw, we need to go through | |
496 | * the new 2.6.16+ tty layer, which has its API more well defined. | |
497 | */ | |
100013fa LL |
498 | len = tty_buffer_request_room(tp->port, len); |
499 | n = len; | |
0b99d589 | 500 | |
100013fa LL |
501 | /* |
502 | * n now contains the most amount of data we can copy, | |
503 | * bounded either by how much the Linux tty layer can handle, | |
504 | * or the amount of data the card actually has pending... | |
505 | */ | |
506 | while (n) { | |
56d118c2 DY |
507 | unsigned char *ch_pos = ch->ch_equeue + tail; |
508 | ||
100013fa LL |
509 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; |
510 | s = min(s, n); | |
0b99d589 | 511 | |
100013fa LL |
512 | if (s <= 0) |
513 | break; | |
0b99d589 LL |
514 | |
515 | /* | |
8b07d521 | 516 | * If conditions are such that ld needs to see all |
100013fa LL |
517 | * UART errors, we will have to walk each character |
518 | * and error byte and send them to the buffer one at | |
519 | * a time. | |
0b99d589 | 520 | */ |
100013fa LL |
521 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
522 | for (i = 0; i < s; i++) { | |
56d118c2 DY |
523 | unsigned char ch = *(ch_pos + i); |
524 | char flag = TTY_NORMAL; | |
525 | ||
526 | if (ch & UART_LSR_BI) | |
527 | flag = TTY_BREAK; | |
528 | else if (ch & UART_LSR_PE) | |
529 | flag = TTY_PARITY; | |
530 | else if (ch & UART_LSR_FE) | |
531 | flag = TTY_FRAME; | |
532 | ||
533 | tty_insert_flip_char(tp->port, ch, flag); | |
100013fa | 534 | } |
2000c581 | 535 | } else { |
56d118c2 | 536 | tty_insert_flip_string(tp->port, ch_pos, s); |
0b99d589 LL |
537 | } |
538 | ||
100013fa LL |
539 | tail += s; |
540 | n -= s; | |
541 | /* Flip queue if needed */ | |
542 | tail &= rmask; | |
0b99d589 | 543 | } |
0b99d589 | 544 | |
100013fa LL |
545 | ch->ch_r_tail = tail & rmask; |
546 | ch->ch_e_tail = tail & rmask; | |
547 | dgnc_check_queue_flow_control(ch); | |
a44b508a | 548 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 549 | |
100013fa LL |
550 | /* Tell the tty layer its okay to "eat" the data now */ |
551 | tty_flip_buffer_push(tp->port); | |
0b99d589 LL |
552 | |
553 | if (ld) | |
554 | tty_ldisc_deref(ld); | |
c84a083b QL |
555 | return; |
556 | ||
557 | exit_unlock: | |
5ec29365 | 558 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
c84a083b QL |
559 | if (ld) |
560 | tty_ldisc_deref(ld); | |
0b99d589 LL |
561 | } |
562 | ||
7127fa28 | 563 | /* |
0b99d589 | 564 | * Determines when CARRIER changes state and takes appropriate |
8b07d521 | 565 | * action. |
7127fa28 | 566 | */ |
0b99d589 LL |
567 | void dgnc_carrier(struct channel_t *ch) |
568 | { | |
90d2a471 LL |
569 | int virt_carrier = 0; |
570 | int phys_carrier = 0; | |
8b07d521 | 571 | |
0b99d589 LL |
572 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
573 | return; | |
574 | ||
f1e51745 | 575 | if (ch->ch_mistat & UART_MSR_DCD) |
0b99d589 | 576 | phys_carrier = 1; |
0b99d589 | 577 | |
50667c67 | 578 | if (ch->ch_digi.digi_flags & DIGI_FORCEDCD) |
0b99d589 | 579 | virt_carrier = 1; |
0b99d589 | 580 | |
50667c67 | 581 | if (ch->ch_c_cflag & CLOCAL) |
0b99d589 | 582 | virt_carrier = 1; |
0b99d589 | 583 | |
7127fa28 WF |
584 | /* Test for a VIRTUAL carrier transition to HIGH. */ |
585 | ||
0b99d589 | 586 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { |
0b99d589 LL |
587 | /* |
588 | * When carrier rises, wake any threads waiting | |
589 | * for carrier in the open routine. | |
590 | */ | |
7df227c4 | 591 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
592 | wake_up_interruptible(&ch->ch_flags_wait); |
593 | } | |
594 | ||
7127fa28 WF |
595 | /* Test for a PHYSICAL carrier transition to HIGH. */ |
596 | ||
0b99d589 | 597 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { |
0b99d589 LL |
598 | /* |
599 | * When carrier rises, wake any threads waiting | |
600 | * for carrier in the open routine. | |
601 | */ | |
7df227c4 | 602 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
603 | wake_up_interruptible(&ch->ch_flags_wait); |
604 | } | |
605 | ||
606 | /* | |
607 | * Test for a PHYSICAL transition to low, so long as we aren't | |
608 | * currently ignoring physical transitions (which is what "virtual | |
609 | * carrier" indicates). | |
610 | * | |
611 | * The transition of the virtual carrier to low really doesn't | |
612 | * matter... it really only means "ignore carrier state", not | |
613 | * "make pretend that carrier is there". | |
614 | */ | |
615 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) && | |
10352c2a | 616 | (phys_carrier == 0)) { |
0b99d589 LL |
617 | /* |
618 | * When carrier drops: | |
619 | * | |
620 | * Drop carrier on all open units. | |
621 | * | |
622 | * Flush queues, waking up any task waiting in the | |
623 | * line discipline. | |
624 | * | |
625 | * Send a hangup to the control terminal. | |
626 | * | |
627 | * Enable all select calls. | |
628 | */ | |
7df227c4 | 629 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
630 | wake_up_interruptible(&ch->ch_flags_wait); |
631 | ||
f1e51745 | 632 | if (ch->ch_tun.un_open_count > 0) |
0b99d589 | 633 | tty_hangup(ch->ch_tun.un_tty); |
0b99d589 | 634 | |
f1e51745 | 635 | if (ch->ch_pun.un_open_count > 0) |
0b99d589 | 636 | tty_hangup(ch->ch_pun.un_tty); |
0b99d589 LL |
637 | } |
638 | ||
7127fa28 WF |
639 | /* Make sure that our cached values reflect the current reality. */ |
640 | ||
0b99d589 LL |
641 | if (virt_carrier == 1) |
642 | ch->ch_flags |= CH_FCAR; | |
8b07d521 | 643 | else |
0b99d589 LL |
644 | ch->ch_flags &= ~CH_FCAR; |
645 | ||
646 | if (phys_carrier == 1) | |
647 | ch->ch_flags |= CH_CD; | |
648 | else | |
649 | ch->ch_flags &= ~CH_CD; | |
650 | } | |
651 | ||
7127fa28 WF |
652 | /* Assign the custom baud rate to the channel structure */ |
653 | ||
0b99d589 LL |
654 | static void dgnc_set_custom_speed(struct channel_t *ch, uint newrate) |
655 | { | |
656 | int testdiv; | |
657 | int testrate_high; | |
8b07d521 | 658 | int testrate_low; |
0b99d589 LL |
659 | int deltahigh; |
660 | int deltalow; | |
661 | ||
93c76c9c DY |
662 | if (newrate <= 0) { |
663 | ch->ch_custom_speed = 0; | |
664 | return; | |
665 | } | |
0b99d589 LL |
666 | |
667 | /* | |
668 | * Since the divisor is stored in a 16-bit integer, we make sure | |
669 | * we don't allow any rates smaller than a 16-bit integer would allow. | |
670 | * And of course, rates above the dividend won't fly. | |
671 | */ | |
672 | if (newrate && newrate < ((ch->ch_bd->bd_dividend / 0xFFFF) + 1)) | |
0b7ceaa6 | 673 | newrate = (ch->ch_bd->bd_dividend / 0xFFFF) + 1; |
0b99d589 LL |
674 | |
675 | if (newrate && newrate > ch->ch_bd->bd_dividend) | |
90d2a471 | 676 | newrate = ch->ch_bd->bd_dividend; |
0b99d589 | 677 | |
93c76c9c | 678 | if (newrate > 0) { |
0b99d589 LL |
679 | testdiv = ch->ch_bd->bd_dividend / newrate; |
680 | ||
681 | /* | |
682 | * If we try to figure out what rate the board would use | |
683 | * with the test divisor, it will be either equal or higher | |
684 | * than the requested baud rate. If we then determine the | |
8b07d521 | 685 | * rate with a divisor one higher, we will get the next lower |
0b99d589 LL |
686 | * supported rate below the requested. |
687 | */ | |
688 | testrate_high = ch->ch_bd->bd_dividend / testdiv; | |
689 | testrate_low = ch->ch_bd->bd_dividend / (testdiv + 1); | |
690 | ||
691 | /* | |
692 | * If the rate for the requested divisor is correct, just | |
693 | * use it and be done. | |
694 | */ | |
93c76c9c DY |
695 | if (testrate_high != newrate) { |
696 | /* | |
851f306d CM |
697 | * Otherwise, pick the rate that is closer |
698 | * (i.e. whichever rate has a smaller delta). | |
93c76c9c DY |
699 | */ |
700 | deltahigh = testrate_high - newrate; | |
701 | deltalow = newrate - testrate_low; | |
0b99d589 | 702 | |
50667c67 | 703 | if (deltahigh < deltalow) |
93c76c9c | 704 | newrate = testrate_high; |
50667c67 | 705 | else |
93c76c9c | 706 | newrate = testrate_low; |
0b99d589 | 707 | } |
0b99d589 | 708 | } |
8b07d521 | 709 | |
0b99d589 | 710 | ch->ch_custom_speed = newrate; |
0b99d589 LL |
711 | } |
712 | ||
0b99d589 LL |
713 | void dgnc_check_queue_flow_control(struct channel_t *ch) |
714 | { | |
d09c1b96 | 715 | int qleft; |
0b99d589 LL |
716 | |
717 | /* Store how much space we have left in the queue */ | |
f7c851d4 CP |
718 | qleft = ch->ch_r_tail - ch->ch_r_head - 1; |
719 | if (qleft < 0) | |
0b99d589 LL |
720 | qleft += RQUEUEMASK + 1; |
721 | ||
722 | /* | |
723 | * Check to see if we should enforce flow control on our queue because | |
724 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
725 | * | |
726 | * NOTE: This is done based on what the current flow control of the | |
727 | * port is set for. | |
728 | * | |
729 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
730 | * This will cause the UART's FIFO to back up, and force | |
731 | * the RTS signal to be dropped. | |
732 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
733 | * the other side, in hopes it will stop sending data to us. | |
734 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
735 | * that gets sent into us when the queue fills up. | |
736 | */ | |
737 | if (qleft < 256) { | |
738 | /* HWFLOW */ | |
851f306d CM |
739 | if (ch->ch_digi.digi_flags & CTSPACE || |
740 | ch->ch_c_cflag & CRTSCTS) { | |
a82477c3 | 741 | if (!(ch->ch_flags & CH_RECEIVER_OFF)) { |
0b99d589 LL |
742 | ch->ch_bd->bd_ops->disable_receiver(ch); |
743 | ch->ch_flags |= (CH_RECEIVER_OFF); | |
0b99d589 LL |
744 | } |
745 | } | |
746 | /* SWFLOW */ | |
747 | else if (ch->ch_c_iflag & IXOFF) { | |
748 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
749 | ch->ch_bd->bd_ops->send_stop_character(ch); | |
750 | ch->ch_stops_sent++; | |
0b99d589 LL |
751 | } |
752 | } | |
0b99d589 LL |
753 | } |
754 | ||
755 | /* | |
756 | * Check to see if we should unenforce flow control because | |
757 | * ld (or user) finally read enuf data out of our queue. | |
758 | * | |
759 | * NOTE: This is done based on what the current flow control of the | |
760 | * port is set for. | |
761 | * | |
762 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
763 | * This will cause the UART's FIFO to raise RTS back up, | |
764 | * which will allow the other side to start sending data again. | |
765 | * 2) SWFLOW (IXOFF) - Send a start character to | |
766 | * the other side, so it will start sending data to us again. | |
767 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
768 | * other side, we don't need to do anything now. | |
769 | */ | |
770 | if (qleft > (RQUEUESIZE / 2)) { | |
771 | /* HWFLOW */ | |
851f306d CM |
772 | if (ch->ch_digi.digi_flags & RTSPACE || |
773 | ch->ch_c_cflag & CRTSCTS) { | |
0b99d589 LL |
774 | if (ch->ch_flags & CH_RECEIVER_OFF) { |
775 | ch->ch_bd->bd_ops->enable_receiver(ch); | |
776 | ch->ch_flags &= ~(CH_RECEIVER_OFF); | |
0b99d589 LL |
777 | } |
778 | } | |
779 | /* SWFLOW */ | |
780 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
781 | ch->ch_stops_sent = 0; | |
782 | ch->ch_bd->bd_ops->send_start_character(ch); | |
0b99d589 | 783 | } |
0b99d589 LL |
784 | } |
785 | } | |
786 | ||
0b99d589 LL |
787 | void dgnc_wakeup_writes(struct channel_t *ch) |
788 | { | |
789 | int qlen = 0; | |
a44b508a | 790 | unsigned long flags; |
0b99d589 LL |
791 | |
792 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
793 | return; | |
794 | ||
a44b508a | 795 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 796 | |
7127fa28 WF |
797 | /* If channel now has space, wake up anyone waiting on the condition. */ |
798 | ||
f7c851d4 CP |
799 | qlen = ch->ch_w_head - ch->ch_w_tail; |
800 | if (qlen < 0) | |
90d2a471 | 801 | qlen += WQUEUESIZE; |
0b99d589 LL |
802 | |
803 | if (qlen >= (WQUEUESIZE - 256)) { | |
a44b508a | 804 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
805 | return; |
806 | } | |
807 | ||
808 | if (ch->ch_tun.un_flags & UN_ISOPEN) { | |
6aa56785 | 809 | tty_wakeup(ch->ch_tun.un_tty); |
0b99d589 LL |
810 | |
811 | /* | |
812 | * If unit is set to wait until empty, check to make sure | |
813 | * the queue AND FIFO are both empty. | |
814 | */ | |
815 | if (ch->ch_tun.un_flags & UN_EMPTY) { | |
851f306d | 816 | if ((qlen == 0) && |
e352d3f1 | 817 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) { |
0b99d589 LL |
818 | ch->ch_tun.un_flags &= ~(UN_EMPTY); |
819 | ||
820 | /* | |
821 | * If RTS Toggle mode is on, whenever | |
822 | * the queue and UART is empty, keep RTS low. | |
823 | */ | |
824 | if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) { | |
825 | ch->ch_mostat &= ~(UART_MCR_RTS); | |
826 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
827 | } | |
828 | ||
829 | /* | |
830 | * If DTR Toggle mode is on, whenever | |
831 | * the queue and UART is empty, keep DTR low. | |
832 | */ | |
833 | if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) { | |
834 | ch->ch_mostat &= ~(UART_MCR_DTR); | |
835 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
836 | } | |
837 | } | |
838 | } | |
839 | ||
840 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); | |
841 | } | |
842 | ||
843 | if (ch->ch_pun.un_flags & UN_ISOPEN) { | |
6aa56785 | 844 | tty_wakeup(ch->ch_pun.un_tty); |
0b99d589 LL |
845 | |
846 | /* | |
847 | * If unit is set to wait until empty, check to make sure | |
848 | * the queue AND FIFO are both empty. | |
849 | */ | |
850 | if (ch->ch_pun.un_flags & UN_EMPTY) { | |
851f306d CM |
851 | if ((qlen == 0) && |
852 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) | |
0b99d589 | 853 | ch->ch_pun.un_flags &= ~(UN_EMPTY); |
0b99d589 LL |
854 | } |
855 | ||
856 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); | |
857 | } | |
858 | ||
a44b508a | 859 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
860 | } |
861 | ||
2e41eb96 | 862 | static struct dgnc_board *find_board_by_major(unsigned int major) |
9f7a104c DY |
863 | { |
864 | int i; | |
865 | ||
866 | for (i = 0; i < MAXBOARDS; i++) { | |
867 | struct dgnc_board *brd = dgnc_board[i]; | |
868 | ||
869 | if (!brd) | |
870 | return NULL; | |
871 | ||
872 | if (major == brd->serial_driver->major || | |
873 | major == brd->print_driver->major) | |
874 | return brd; | |
875 | } | |
876 | ||
877 | return NULL; | |
878 | } | |
879 | ||
7127fa28 WF |
880 | /* TTY Entry points and helper functions */ |
881 | ||
882 | /* dgnc_tty_open() */ | |
0b99d589 | 883 | |
0b99d589 LL |
884 | static int dgnc_tty_open(struct tty_struct *tty, struct file *file) |
885 | { | |
03425f55 | 886 | struct dgnc_board *brd; |
0b99d589 LL |
887 | struct channel_t *ch; |
888 | struct un_t *un; | |
889 | uint major = 0; | |
890 | uint minor = 0; | |
891 | int rc = 0; | |
a44b508a | 892 | unsigned long flags; |
0b99d589 LL |
893 | |
894 | rc = 0; | |
895 | ||
896 | major = MAJOR(tty_devnum(tty)); | |
897 | minor = MINOR(tty_devnum(tty)); | |
898 | ||
50667c67 | 899 | if (major > 255) |
0b99d589 | 900 | return -ENXIO; |
0b99d589 LL |
901 | |
902 | /* Get board pointer from our array of majors we have allocated */ | |
9f7a104c | 903 | brd = find_board_by_major(major); |
50667c67 | 904 | if (!brd) |
0b99d589 | 905 | return -ENXIO; |
0b99d589 LL |
906 | |
907 | /* | |
908 | * If board is not yet up to a state of READY, go to | |
909 | * sleep waiting for it to happen or they cancel the open. | |
910 | */ | |
911 | rc = wait_event_interruptible(brd->state_wait, | |
e352d3f1 | 912 | (brd->state & BOARD_READY)); |
0b99d589 | 913 | |
50667c67 | 914 | if (rc) |
0b99d589 | 915 | return rc; |
0b99d589 | 916 | |
a44b508a | 917 | spin_lock_irqsave(&brd->bd_lock, flags); |
0b99d589 LL |
918 | |
919 | /* If opened device is greater than our number of ports, bail. */ | |
4bef52f3 | 920 | if (PORT_NUM(minor) >= brd->nasync) { |
a44b508a | 921 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
922 | return -ENXIO; |
923 | } | |
924 | ||
925 | ch = brd->channels[PORT_NUM(minor)]; | |
926 | if (!ch) { | |
a44b508a | 927 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
928 | return -ENXIO; |
929 | } | |
930 | ||
931 | /* Drop board lock */ | |
a44b508a | 932 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
933 | |
934 | /* Grab channel lock */ | |
a44b508a | 935 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
936 | |
937 | /* Figure out our type */ | |
938 | if (!IS_PRINT(minor)) { | |
939 | un = &brd->channels[PORT_NUM(minor)]->ch_tun; | |
940 | un->un_type = DGNC_SERIAL; | |
2000c581 | 941 | } else if (IS_PRINT(minor)) { |
0b99d589 LL |
942 | un = &brd->channels[PORT_NUM(minor)]->ch_pun; |
943 | un->un_type = DGNC_PRINT; | |
2000c581 | 944 | } else { |
a44b508a | 945 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
946 | return -ENXIO; |
947 | } | |
948 | ||
949 | /* | |
950 | * If the port is still in a previous open, and in a state | |
951 | * where we simply cannot safely keep going, wait until the | |
952 | * state clears. | |
953 | */ | |
a44b508a | 954 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 955 | |
851f306d CM |
956 | rc = wait_event_interruptible(ch->ch_flags_wait, |
957 | ((ch->ch_flags & CH_OPENING) == 0)); | |
0b99d589 LL |
958 | |
959 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 960 | if (rc) |
0b99d589 | 961 | return -EINTR; |
0b99d589 LL |
962 | |
963 | /* | |
964 | * If either unit is in the middle of the fragile part of close, | |
965 | * we just cannot touch the channel safely. | |
966 | * Go to sleep, knowing that when the channel can be | |
967 | * touched safely, the close routine will signal the | |
968 | * ch_flags_wait to wake us back up. | |
969 | */ | |
7bd43874 WF |
970 | rc = wait_event_interruptible(ch->ch_flags_wait, (((ch->ch_tun.un_flags | |
971 | ch->ch_pun.un_flags) & UN_CLOSING) == 0)); | |
0b99d589 LL |
972 | |
973 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 974 | if (rc) |
0b99d589 | 975 | return -EINTR; |
0b99d589 | 976 | |
a44b508a | 977 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 978 | |
0b99d589 LL |
979 | /* Store our unit into driver_data, so we always have it available. */ |
980 | tty->driver_data = un; | |
981 | ||
7127fa28 WF |
982 | /* Initialize tty's */ |
983 | ||
0b99d589 LL |
984 | if (!(un->un_flags & UN_ISOPEN)) { |
985 | /* Store important variables. */ | |
986 | un->un_tty = tty; | |
987 | ||
988 | /* Maybe do something here to the TTY struct as well? */ | |
989 | } | |
990 | ||
0b99d589 LL |
991 | /* |
992 | * Allocate channel buffers for read/write/error. | |
993 | * Set flag, so we don't get trounced on. | |
994 | */ | |
995 | ch->ch_flags |= (CH_OPENING); | |
996 | ||
997 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
a44b508a | 998 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
999 | |
1000 | if (!ch->ch_rqueue) | |
52f9d668 | 1001 | ch->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1002 | if (!ch->ch_equeue) |
52f9d668 | 1003 | ch->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1004 | if (!ch->ch_wqueue) |
52f9d668 | 1005 | ch->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1006 | |
16f10a82 DY |
1007 | if (!ch->ch_rqueue || !ch->ch_equeue || !ch->ch_wqueue) { |
1008 | kfree(ch->ch_rqueue); | |
1009 | kfree(ch->ch_equeue); | |
1010 | kfree(ch->ch_wqueue); | |
1011 | ||
1012 | return -ENOMEM; | |
1013 | } | |
1014 | ||
a44b508a | 1015 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1016 | |
1017 | ch->ch_flags &= ~(CH_OPENING); | |
1018 | wake_up_interruptible(&ch->ch_flags_wait); | |
1019 | ||
7127fa28 WF |
1020 | /* Initialize if neither terminal or printer is open. */ |
1021 | ||
0b99d589 | 1022 | if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_ISOPEN)) { |
7127fa28 | 1023 | /* Flush input queues. */ |
587abd7b SL |
1024 | ch->ch_r_head = 0; |
1025 | ch->ch_r_tail = 0; | |
1026 | ch->ch_e_head = 0; | |
1027 | ch->ch_e_tail = 0; | |
1028 | ch->ch_w_head = 0; | |
1029 | ch->ch_w_tail = 0; | |
0b99d589 LL |
1030 | |
1031 | brd->bd_ops->flush_uart_write(ch); | |
1032 | brd->bd_ops->flush_uart_read(ch); | |
1033 | ||
1034 | ch->ch_flags = 0; | |
1035 | ch->ch_cached_lsr = 0; | |
1036 | ch->ch_stop_sending_break = 0; | |
1037 | ch->ch_stops_sent = 0; | |
1038 | ||
22e3de76 LL |
1039 | ch->ch_c_cflag = tty->termios.c_cflag; |
1040 | ch->ch_c_iflag = tty->termios.c_iflag; | |
1041 | ch->ch_c_oflag = tty->termios.c_oflag; | |
1042 | ch->ch_c_lflag = tty->termios.c_lflag; | |
1043 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
1044 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
1045 | |
1046 | /* | |
1047 | * Bring up RTS and DTR... | |
1048 | * Also handle RTS or DTR toggle if set. | |
1049 | */ | |
1050 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
1051 | ch->ch_mostat |= (UART_MCR_RTS); | |
1052 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
1053 | ch->ch_mostat |= (UART_MCR_DTR); | |
1054 | ||
1055 | /* Tell UART to init itself */ | |
1056 | brd->bd_ops->uart_init(ch); | |
1057 | } | |
1058 | ||
7127fa28 WF |
1059 | /* Run param in case we changed anything */ |
1060 | ||
0b99d589 LL |
1061 | brd->bd_ops->param(tty); |
1062 | ||
1063 | dgnc_carrier(ch); | |
1064 | ||
7127fa28 | 1065 | /* follow protocol for opening port */ |
0b99d589 | 1066 | |
a44b508a | 1067 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1068 | |
1069 | rc = dgnc_block_til_ready(tty, file, ch); | |
1070 | ||
0b99d589 | 1071 | /* No going back now, increment our unit and channel counters */ |
a44b508a | 1072 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1073 | ch->ch_open_count++; |
1074 | un->un_open_count++; | |
1075 | un->un_flags |= (UN_ISOPEN); | |
a44b508a | 1076 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1077 | |
8f90ef80 | 1078 | return rc; |
0b99d589 LL |
1079 | } |
1080 | ||
8b07d521 | 1081 | /* |
0b99d589 LL |
1082 | * dgnc_block_til_ready() |
1083 | * | |
1084 | * Wait for DCD, if needed. | |
1085 | */ | |
851f306d CM |
1086 | static int dgnc_block_til_ready(struct tty_struct *tty, |
1087 | struct file *file, | |
1088 | struct channel_t *ch) | |
8b07d521 | 1089 | { |
0b99d589 | 1090 | int retval = 0; |
10334418 | 1091 | struct un_t *un = tty->driver_data; |
a44b508a | 1092 | unsigned long flags; |
0b99d589 LL |
1093 | uint old_flags = 0; |
1094 | int sleep_on_un_flags = 0; | |
1095 | ||
10334418 | 1096 | if (!file) |
8f90ef80 | 1097 | return -ENXIO; |
0b99d589 | 1098 | |
a44b508a | 1099 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1100 | |
1101 | ch->ch_wopen++; | |
1102 | ||
1103 | /* Loop forever */ | |
1104 | while (1) { | |
0b99d589 LL |
1105 | sleep_on_un_flags = 0; |
1106 | ||
1107 | /* | |
851f306d CM |
1108 | * If board has failed somehow during our sleep, |
1109 | * bail with error. | |
0b99d589 LL |
1110 | */ |
1111 | if (ch->ch_bd->state == BOARD_FAILED) { | |
1112 | retval = -ENXIO; | |
1113 | break; | |
1114 | } | |
1115 | ||
1116 | /* If tty was hung up, break out of loop and set error. */ | |
1117 | if (tty_hung_up_p(file)) { | |
1118 | retval = -EAGAIN; | |
1119 | break; | |
1120 | } | |
1121 | ||
1122 | /* | |
1123 | * If either unit is in the middle of the fragile part of close, | |
1124 | * we just cannot touch the channel safely. | |
1125 | * Go back to sleep, knowing that when the channel can be | |
8b07d521 | 1126 | * touched safely, the close routine will signal the |
0b99d589 LL |
1127 | * ch_wait_flags to wake us back up. |
1128 | */ | |
851f306d CM |
1129 | if (!((ch->ch_tun.un_flags | |
1130 | ch->ch_pun.un_flags) & | |
1131 | UN_CLOSING)) { | |
0b99d589 LL |
1132 | /* |
1133 | * Our conditions to leave cleanly and happily: | |
1134 | * 1) NONBLOCKING on the tty is set. | |
1135 | * 2) CLOCAL is set. | |
1136 | * 3) DCD (fake or real) is active. | |
1137 | */ | |
1138 | ||
50667c67 | 1139 | if (file->f_flags & O_NONBLOCK) |
0b99d589 | 1140 | break; |
0b99d589 | 1141 | |
18900ca6 | 1142 | if (tty_io_error(tty)) { |
0b99d589 LL |
1143 | retval = -EIO; |
1144 | break; | |
1145 | } | |
1146 | ||
f1e51745 | 1147 | if (ch->ch_flags & CH_CD) |
0b99d589 | 1148 | break; |
0b99d589 | 1149 | |
f1e51745 | 1150 | if (ch->ch_flags & CH_FCAR) |
0b99d589 | 1151 | break; |
2000c581 | 1152 | } else { |
0b99d589 LL |
1153 | sleep_on_un_flags = 1; |
1154 | } | |
1155 | ||
1156 | /* | |
1157 | * If there is a signal pending, the user probably | |
1158 | * interrupted (ctrl-c) us. | |
1159 | * Leave loop with error set. | |
1160 | */ | |
1161 | if (signal_pending(current)) { | |
0b99d589 LL |
1162 | retval = -ERESTARTSYS; |
1163 | break; | |
1164 | } | |
1165 | ||
7127fa28 WF |
1166 | /* Store the flags before we let go of channel lock */ |
1167 | ||
0b99d589 LL |
1168 | if (sleep_on_un_flags) |
1169 | old_flags = ch->ch_tun.un_flags | ch->ch_pun.un_flags; | |
1170 | else | |
1171 | old_flags = ch->ch_flags; | |
1172 | ||
1173 | /* | |
1174 | * Let go of channel lock before calling schedule. | |
1175 | * Our poller will get any FEP events and wake us up when DCD | |
1176 | * eventually goes active. | |
1177 | */ | |
1178 | ||
a44b508a | 1179 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1180 | |
0b99d589 | 1181 | /* |
851f306d CM |
1182 | * Wait for something in the flags to change |
1183 | * from the current value. | |
0b99d589 | 1184 | */ |
50667c67 | 1185 | if (sleep_on_un_flags) |
7bd43874 WF |
1186 | retval = wait_event_interruptible |
1187 | (un->un_flags_wait, (old_flags != (ch->ch_tun.un_flags | | |
1188 | ch->ch_pun.un_flags))); | |
50667c67 | 1189 | else |
0b99d589 | 1190 | retval = wait_event_interruptible(ch->ch_flags_wait, |
7bd43874 | 1191 | (old_flags != ch->ch_flags)); |
0b99d589 | 1192 | |
0b99d589 LL |
1193 | /* |
1194 | * We got woken up for some reason. | |
1195 | * Before looping around, grab our channel lock. | |
1196 | */ | |
a44b508a | 1197 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1198 | } |
1199 | ||
1200 | ch->ch_wopen--; | |
1201 | ||
a44b508a | 1202 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1203 | |
36e712a8 | 1204 | return retval; |
0b99d589 LL |
1205 | } |
1206 | ||
0b99d589 LL |
1207 | /* |
1208 | * dgnc_tty_hangup() | |
1209 | * | |
1210 | * Hangup the port. Like a close, but don't wait for output to drain. | |
8b07d521 | 1211 | */ |
0b99d589 LL |
1212 | static void dgnc_tty_hangup(struct tty_struct *tty) |
1213 | { | |
0b99d589 LL |
1214 | if (!tty || tty->magic != TTY_MAGIC) |
1215 | return; | |
1216 | ||
0b99d589 LL |
1217 | /* flush the transmit queues */ |
1218 | dgnc_tty_flush_buffer(tty); | |
0b99d589 LL |
1219 | } |
1220 | ||
7127fa28 WF |
1221 | /* dgnc_tty_close() */ |
1222 | ||
0b99d589 LL |
1223 | static void dgnc_tty_close(struct tty_struct *tty, struct file *file) |
1224 | { | |
03425f55 | 1225 | struct dgnc_board *bd; |
0b99d589 LL |
1226 | struct channel_t *ch; |
1227 | struct un_t *un; | |
a44b508a | 1228 | unsigned long flags; |
0b99d589 LL |
1229 | |
1230 | if (!tty || tty->magic != TTY_MAGIC) | |
1231 | return; | |
1232 | ||
1233 | un = tty->driver_data; | |
1234 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1235 | return; | |
1236 | ||
1237 | ch = un->un_ch; | |
1238 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1239 | return; | |
1240 | ||
1241 | bd = ch->ch_bd; | |
1242 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1243 | return; | |
1244 | ||
a44b508a | 1245 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1246 | |
1247 | /* | |
1248 | * Determine if this is the last close or not - and if we agree about | |
1249 | * which type of close it is with the Line Discipline | |
1250 | */ | |
1251 | if ((tty->count == 1) && (un->un_open_count != 1)) { | |
1252 | /* | |
1253 | * Uh, oh. tty->count is 1, which means that the tty | |
1254 | * structure will be freed. un_open_count should always | |
1255 | * be one in these conditions. If it's greater than | |
1256 | * one, we've got real problems, since it means the | |
1257 | * serial port won't be shutdown. | |
1258 | */ | |
1f26adc9 RD |
1259 | dev_dbg(tty->dev, |
1260 | "tty->count is 1, un open count is %d\n", | |
1261 | un->un_open_count); | |
0b99d589 | 1262 | un->un_open_count = 1; |
8b07d521 | 1263 | } |
0b99d589 | 1264 | |
3098e514 DY |
1265 | if (un->un_open_count) |
1266 | un->un_open_count--; | |
1267 | else | |
1f26adc9 RD |
1268 | dev_dbg(tty->dev, |
1269 | "bad serial port open count of %d\n", | |
1270 | un->un_open_count); | |
0b99d589 LL |
1271 | |
1272 | ch->ch_open_count--; | |
1273 | ||
1274 | if (ch->ch_open_count && un->un_open_count) { | |
a44b508a | 1275 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
90d2a471 LL |
1276 | return; |
1277 | } | |
0b99d589 LL |
1278 | |
1279 | /* OK, its the last close on the unit */ | |
0b99d589 LL |
1280 | un->un_flags |= UN_CLOSING; |
1281 | ||
1282 | tty->closing = 1; | |
1283 | ||
0b99d589 LL |
1284 | /* |
1285 | * Only officially close channel if count is 0 and | |
90d2a471 | 1286 | * DIGI_PRINTER bit is not set. |
0b99d589 | 1287 | */ |
851f306d CM |
1288 | if ((ch->ch_open_count == 0) && |
1289 | !(ch->ch_digi.digi_flags & DIGI_PRINTER)) { | |
0b99d589 LL |
1290 | ch->ch_flags &= ~(CH_STOPI | CH_FORCED_STOPI); |
1291 | ||
7127fa28 WF |
1292 | /* turn off print device when closing print device. */ |
1293 | ||
9cdf838b | 1294 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1295 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1296 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1297 | ch->ch_flags &= ~CH_PRON; |
1298 | } | |
1299 | ||
a44b508a | 1300 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1301 | /* wait for output to drain */ |
1302 | /* This will also return if we take an interrupt */ | |
1303 | ||
2d9920ec | 1304 | bd->bd_ops->drain(tty, 0); |
0b99d589 | 1305 | |
0b99d589 LL |
1306 | dgnc_tty_flush_buffer(tty); |
1307 | tty_ldisc_flush(tty); | |
1308 | ||
a44b508a | 1309 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1310 | |
1311 | tty->closing = 0; | |
1312 | ||
7127fa28 WF |
1313 | /* If we have HUPCL set, lower DTR and RTS */ |
1314 | ||
0b99d589 | 1315 | if (ch->ch_c_cflag & HUPCL) { |
0b99d589 LL |
1316 | /* Drop RTS/DTR */ |
1317 | ch->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
1318 | bd->bd_ops->assert_modem_signals(ch); | |
1319 | ||
1320 | /* | |
8b07d521 | 1321 | * Go to sleep to ensure RTS/DTR |
0b99d589 LL |
1322 | * have been dropped for modems to see it. |
1323 | */ | |
1324 | if (ch->ch_close_delay) { | |
a44b508a RD |
1325 | spin_unlock_irqrestore(&ch->ch_lock, |
1326 | flags); | |
0b99d589 | 1327 | dgnc_ms_sleep(ch->ch_close_delay); |
a44b508a | 1328 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1329 | } |
1330 | } | |
1331 | ||
1332 | ch->ch_old_baud = 0; | |
1333 | ||
1334 | /* Turn off UART interrupts for this port */ | |
1335 | ch->ch_bd->bd_ops->uart_off(ch); | |
2000c581 | 1336 | } else { |
7127fa28 WF |
1337 | /* turn off print device when closing print device. */ |
1338 | ||
9cdf838b | 1339 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1340 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1341 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1342 | ch->ch_flags &= ~CH_PRON; |
1343 | } | |
1344 | } | |
1345 | ||
1346 | un->un_tty = NULL; | |
1347 | un->un_flags &= ~(UN_ISOPEN | UN_CLOSING); | |
1348 | ||
0b99d589 LL |
1349 | wake_up_interruptible(&ch->ch_flags_wait); |
1350 | wake_up_interruptible(&un->un_flags_wait); | |
1351 | ||
a44b508a | 1352 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1353 | } |
1354 | ||
0b99d589 LL |
1355 | /* |
1356 | * dgnc_tty_chars_in_buffer() | |
1357 | * | |
1358 | * Return number of characters that have not been transmitted yet. | |
1359 | * | |
1360 | * This routine is used by the line discipline to determine if there | |
1361 | * is data waiting to be transmitted/drained/flushed or not. | |
1362 | */ | |
1363 | static int dgnc_tty_chars_in_buffer(struct tty_struct *tty) | |
1364 | { | |
1365 | struct channel_t *ch = NULL; | |
1366 | struct un_t *un = NULL; | |
1367 | ushort thead; | |
1368 | ushort ttail; | |
1369 | uint tmask; | |
1370 | uint chars = 0; | |
a44b508a | 1371 | unsigned long flags; |
0b99d589 | 1372 | |
60acb623 | 1373 | if (!tty) |
8f90ef80 | 1374 | return 0; |
0b99d589 LL |
1375 | |
1376 | un = tty->driver_data; | |
1377 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1378 | return 0; |
0b99d589 LL |
1379 | |
1380 | ch = un->un_ch; | |
1381 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1382 | return 0; |
0b99d589 | 1383 | |
a44b508a | 1384 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1385 | |
1386 | tmask = WQUEUEMASK; | |
1387 | thead = ch->ch_w_head & tmask; | |
1388 | ttail = ch->ch_w_tail & tmask; | |
1389 | ||
a44b508a | 1390 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1391 | |
1392 | if (ttail == thead) { | |
1393 | chars = 0; | |
1394 | } else { | |
1395 | if (thead >= ttail) | |
1396 | chars = thead - ttail; | |
1397 | else | |
1398 | chars = thead - ttail + WQUEUESIZE; | |
1399 | } | |
1400 | ||
8f90ef80 | 1401 | return chars; |
0b99d589 LL |
1402 | } |
1403 | ||
8b07d521 | 1404 | /* |
0b99d589 LL |
1405 | * dgnc_maxcps_room |
1406 | * | |
1407 | * Reduces bytes_available to the max number of characters | |
1408 | * that can be sent currently given the maxcps value, and | |
1409 | * returns the new bytes_available. This only affects printer | |
1410 | * output. | |
8b07d521 | 1411 | */ |
107b40ad | 1412 | static int dgnc_maxcps_room(struct channel_t *ch, int bytes_available) |
0b99d589 | 1413 | { |
9cdf838b | 1414 | if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0) { |
0b99d589 LL |
1415 | int cps_limit = 0; |
1416 | unsigned long current_time = jiffies; | |
1417 | unsigned long buffer_time = current_time + | |
851f306d CM |
1418 | (HZ * ch->ch_digi.digi_bufsize) / |
1419 | ch->ch_digi.digi_maxcps; | |
0b99d589 LL |
1420 | |
1421 | if (ch->ch_cpstime < current_time) { | |
1422 | /* buffer is empty */ | |
851f306d | 1423 | ch->ch_cpstime = current_time; /* reset ch_cpstime */ |
0b99d589 | 1424 | cps_limit = ch->ch_digi.digi_bufsize; |
2000c581 | 1425 | } else if (ch->ch_cpstime < buffer_time) { |
0b99d589 | 1426 | /* still room in the buffer */ |
851f306d CM |
1427 | cps_limit = ((buffer_time - ch->ch_cpstime) * |
1428 | ch->ch_digi.digi_maxcps) / HZ; | |
2000c581 | 1429 | } else { |
0b99d589 | 1430 | /* no room in the buffer */ |
8b07d521 | 1431 | cps_limit = 0; |
0b99d589 LL |
1432 | } |
1433 | ||
1434 | bytes_available = min(cps_limit, bytes_available); | |
1435 | } | |
1436 | ||
8f90ef80 | 1437 | return bytes_available; |
0b99d589 LL |
1438 | } |
1439 | ||
0b99d589 LL |
1440 | /* |
1441 | * dgnc_tty_write_room() | |
1442 | * | |
1443 | * Return space available in Tx buffer | |
8b07d521 | 1444 | */ |
0b99d589 LL |
1445 | static int dgnc_tty_write_room(struct tty_struct *tty) |
1446 | { | |
1447 | struct channel_t *ch = NULL; | |
1448 | struct un_t *un = NULL; | |
1449 | ushort head; | |
1450 | ushort tail; | |
1451 | ushort tmask; | |
1452 | int ret = 0; | |
a44b508a | 1453 | unsigned long flags; |
0b99d589 | 1454 | |
02782a19 | 1455 | if (!tty) |
8f90ef80 | 1456 | return 0; |
0b99d589 LL |
1457 | |
1458 | un = tty->driver_data; | |
1459 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1460 | return 0; |
0b99d589 LL |
1461 | |
1462 | ch = un->un_ch; | |
1463 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1464 | return 0; |
0b99d589 | 1465 | |
a44b508a | 1466 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1467 | |
1468 | tmask = WQUEUEMASK; | |
1469 | head = (ch->ch_w_head) & tmask; | |
1470 | tail = (ch->ch_w_tail) & tmask; | |
1471 | ||
f7c851d4 CP |
1472 | ret = tail - head - 1; |
1473 | if (ret < 0) | |
0b99d589 LL |
1474 | ret += WQUEUESIZE; |
1475 | ||
1476 | /* Limit printer to maxcps */ | |
107b40ad DY |
1477 | if (un->un_type != DGNC_PRINT) |
1478 | ret = dgnc_maxcps_room(ch, ret); | |
0b99d589 LL |
1479 | |
1480 | /* | |
8b07d521 | 1481 | * If we are printer device, leave space for |
0b99d589 LL |
1482 | * possibly both the on and off strings. |
1483 | */ | |
1484 | if (un->un_type == DGNC_PRINT) { | |
1485 | if (!(ch->ch_flags & CH_PRON)) | |
1486 | ret -= ch->ch_digi.digi_onlen; | |
1487 | ret -= ch->ch_digi.digi_offlen; | |
2000c581 | 1488 | } else { |
0b99d589 LL |
1489 | if (ch->ch_flags & CH_PRON) |
1490 | ret -= ch->ch_digi.digi_offlen; | |
1491 | } | |
1492 | ||
1493 | if (ret < 0) | |
1494 | ret = 0; | |
1495 | ||
a44b508a | 1496 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8b07d521 | 1497 | |
8f90ef80 | 1498 | return ret; |
0b99d589 LL |
1499 | } |
1500 | ||
0b99d589 LL |
1501 | /* |
1502 | * dgnc_tty_put_char() | |
1503 | * | |
1504 | * Put a character into ch->ch_buf | |
8b07d521 | 1505 | * |
0b99d589 LL |
1506 | * - used by the line discipline for OPOST processing |
1507 | */ | |
1508 | static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c) | |
1509 | { | |
7127fa28 WF |
1510 | /* Simply call tty_write. */ |
1511 | ||
0b99d589 LL |
1512 | dgnc_tty_write(tty, &c, 1); |
1513 | return 1; | |
1514 | } | |
1515 | ||
0b99d589 LL |
1516 | /* |
1517 | * dgnc_tty_write() | |
1518 | * | |
1519 | * Take data from the user or kernel and send it out to the FEP. | |
1520 | * In here exists all the Transparent Print magic as well. | |
1521 | */ | |
1522 | static int dgnc_tty_write(struct tty_struct *tty, | |
e352d3f1 | 1523 | const unsigned char *buf, int count) |
0b99d589 LL |
1524 | { |
1525 | struct channel_t *ch = NULL; | |
1526 | struct un_t *un = NULL; | |
1527 | int bufcount = 0, n = 0; | |
a44b508a | 1528 | unsigned long flags; |
0b99d589 LL |
1529 | ushort head; |
1530 | ushort tail; | |
1531 | ushort tmask; | |
1532 | uint remain; | |
0b99d589 | 1533 | |
02782a19 | 1534 | if (!tty) |
8f90ef80 | 1535 | return 0; |
0b99d589 LL |
1536 | |
1537 | un = tty->driver_data; | |
1538 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1539 | return 0; |
0b99d589 LL |
1540 | |
1541 | ch = un->un_ch; | |
1542 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1543 | return 0; |
0b99d589 LL |
1544 | |
1545 | if (!count) | |
8f90ef80 | 1546 | return 0; |
0b99d589 | 1547 | |
0b99d589 LL |
1548 | /* |
1549 | * Store original amount of characters passed in. | |
1550 | * This helps to figure out if we should ask the FEP | |
1551 | * to send us an event when it has more space available. | |
1552 | */ | |
0b99d589 | 1553 | |
a44b508a | 1554 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1555 | |
1556 | /* Get our space available for the channel from the board */ | |
1557 | tmask = WQUEUEMASK; | |
1558 | head = (ch->ch_w_head) & tmask; | |
1559 | tail = (ch->ch_w_tail) & tmask; | |
1560 | ||
f7c851d4 CP |
1561 | bufcount = tail - head - 1; |
1562 | if (bufcount < 0) | |
0b99d589 LL |
1563 | bufcount += WQUEUESIZE; |
1564 | ||
0b99d589 LL |
1565 | /* |
1566 | * Limit printer output to maxcps overall, with bursts allowed | |
1567 | * up to bufsize characters. | |
1568 | */ | |
107b40ad DY |
1569 | if (un->un_type != DGNC_PRINT) |
1570 | bufcount = dgnc_maxcps_room(ch, bufcount); | |
0b99d589 LL |
1571 | |
1572 | /* | |
1573 | * Take minimum of what the user wants to send, and the | |
1574 | * space available in the FEP buffer. | |
1575 | */ | |
1576 | count = min(count, bufcount); | |
1577 | ||
7127fa28 WF |
1578 | /* Bail if no space left. */ |
1579 | ||
c84a083b QL |
1580 | if (count <= 0) |
1581 | goto exit_retry; | |
0b99d589 LL |
1582 | |
1583 | /* | |
1584 | * Output the printer ON string, if we are in terminal mode, but | |
1585 | * need to be in printer mode. | |
1586 | */ | |
1587 | if ((un->un_type == DGNC_PRINT) && !(ch->ch_flags & CH_PRON)) { | |
1588 | dgnc_wmove(ch, ch->ch_digi.digi_onstr, | |
e352d3f1 | 1589 | (int)ch->ch_digi.digi_onlen); |
0b99d589 LL |
1590 | head = (ch->ch_w_head) & tmask; |
1591 | ch->ch_flags |= CH_PRON; | |
1592 | } | |
1593 | ||
1594 | /* | |
1595 | * On the other hand, output the printer OFF string, if we are | |
1596 | * currently in printer mode, but need to output to the terminal. | |
1597 | */ | |
1598 | if ((un->un_type != DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { | |
1599 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, | |
e352d3f1 | 1600 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1601 | head = (ch->ch_w_head) & tmask; |
1602 | ch->ch_flags &= ~CH_PRON; | |
1603 | } | |
1604 | ||
0b99d589 LL |
1605 | n = count; |
1606 | ||
1607 | /* | |
1608 | * If the write wraps over the top of the circular buffer, | |
1609 | * move the portion up to the wrap point, and reset the | |
1610 | * pointers to the bottom. | |
1611 | */ | |
1612 | remain = WQUEUESIZE - head; | |
1613 | ||
1614 | if (n >= remain) { | |
1615 | n -= remain; | |
1616 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1617 | head = 0; |
1618 | buf += remain; | |
1619 | } | |
1620 | ||
1621 | if (n > 0) { | |
7127fa28 | 1622 | /* Move rest of data. */ |
0b99d589 LL |
1623 | remain = n; |
1624 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1625 | head += remain; |
1626 | } | |
1627 | ||
1628 | if (count) { | |
1629 | head &= tmask; | |
1630 | ch->ch_w_head = head; | |
1631 | } | |
1632 | ||
0b99d589 | 1633 | /* Update printer buffer empty time. */ |
8d0d4cc5 RS |
1634 | if ((un->un_type == DGNC_PRINT) && (ch->ch_digi.digi_maxcps > 0) && |
1635 | (ch->ch_digi.digi_bufsize > 0)) { | |
90d2a471 | 1636 | ch->ch_cpstime += (HZ * count) / ch->ch_digi.digi_maxcps; |
0b99d589 LL |
1637 | } |
1638 | ||
a74d8e21 | 1639 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1640 | |
0b99d589 LL |
1641 | if (count) { |
1642 | /* | |
1643 | * Channel lock is grabbed and then released | |
1644 | * inside this routine. | |
1645 | */ | |
1646 | ch->ch_bd->bd_ops->copy_data_from_queue_to_uart(ch); | |
1647 | } | |
1648 | ||
8f90ef80 | 1649 | return count; |
c84a083b QL |
1650 | |
1651 | exit_retry: | |
1652 | ||
1653 | spin_unlock_irqrestore(&ch->ch_lock, flags); | |
1654 | return 0; | |
0b99d589 LL |
1655 | } |
1656 | ||
7127fa28 | 1657 | /* Return modem signals to ld. */ |
b74c7461 | 1658 | |
0b99d589 | 1659 | static int dgnc_tty_tiocmget(struct tty_struct *tty) |
0b99d589 LL |
1660 | { |
1661 | struct channel_t *ch; | |
1662 | struct un_t *un; | |
1663 | int result = -EIO; | |
446393e9 | 1664 | unsigned char mstat = 0; |
a44b508a | 1665 | unsigned long flags; |
0b99d589 LL |
1666 | |
1667 | if (!tty || tty->magic != TTY_MAGIC) | |
1668 | return result; | |
1669 | ||
1670 | un = tty->driver_data; | |
1671 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1672 | return result; | |
1673 | ||
1674 | ch = un->un_ch; | |
1675 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1676 | return result; | |
1677 | ||
a44b508a | 1678 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1679 | |
0b7ceaa6 | 1680 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1681 | |
a44b508a | 1682 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1683 | |
1684 | result = 0; | |
1685 | ||
1686 | if (mstat & UART_MCR_DTR) | |
1687 | result |= TIOCM_DTR; | |
1688 | if (mstat & UART_MCR_RTS) | |
1689 | result |= TIOCM_RTS; | |
1690 | if (mstat & UART_MSR_CTS) | |
1691 | result |= TIOCM_CTS; | |
1692 | if (mstat & UART_MSR_DSR) | |
1693 | result |= TIOCM_DSR; | |
1694 | if (mstat & UART_MSR_RI) | |
1695 | result |= TIOCM_RI; | |
1696 | if (mstat & UART_MSR_DCD) | |
1697 | result |= TIOCM_CD; | |
1698 | ||
0b99d589 LL |
1699 | return result; |
1700 | } | |
1701 | ||
0b99d589 LL |
1702 | /* |
1703 | * dgnc_tty_tiocmset() | |
1704 | * | |
1705 | * Set modem signals, called by ld. | |
1706 | */ | |
b74c7461 | 1707 | |
0b99d589 | 1708 | static int dgnc_tty_tiocmset(struct tty_struct *tty, |
e352d3f1 | 1709 | unsigned int set, unsigned int clear) |
0b99d589 | 1710 | { |
03425f55 | 1711 | struct dgnc_board *bd; |
0b99d589 LL |
1712 | struct channel_t *ch; |
1713 | struct un_t *un; | |
1714 | int ret = -EIO; | |
a44b508a | 1715 | unsigned long flags; |
0b99d589 LL |
1716 | |
1717 | if (!tty || tty->magic != TTY_MAGIC) | |
1718 | return ret; | |
1719 | ||
1720 | un = tty->driver_data; | |
1721 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1722 | return ret; | |
1723 | ||
1724 | ch = un->un_ch; | |
1725 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1726 | return ret; | |
1727 | ||
1728 | bd = ch->ch_bd; | |
1729 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1730 | return ret; | |
1731 | ||
a44b508a | 1732 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1733 | |
50667c67 | 1734 | if (set & TIOCM_RTS) |
0b99d589 | 1735 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 1736 | |
50667c67 | 1737 | if (set & TIOCM_DTR) |
0b99d589 | 1738 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 | 1739 | |
50667c67 | 1740 | if (clear & TIOCM_RTS) |
0b99d589 | 1741 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 1742 | |
50667c67 | 1743 | if (clear & TIOCM_DTR) |
0b99d589 | 1744 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
1745 | |
1746 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
1747 | ||
a44b508a | 1748 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1749 | |
8f90ef80 | 1750 | return 0; |
0b99d589 LL |
1751 | } |
1752 | ||
0b99d589 LL |
1753 | /* |
1754 | * dgnc_tty_send_break() | |
1755 | * | |
1756 | * Send a Break, called by ld. | |
1757 | */ | |
1758 | static int dgnc_tty_send_break(struct tty_struct *tty, int msec) | |
1759 | { | |
03425f55 | 1760 | struct dgnc_board *bd; |
0b99d589 LL |
1761 | struct channel_t *ch; |
1762 | struct un_t *un; | |
1763 | int ret = -EIO; | |
a44b508a | 1764 | unsigned long flags; |
0b99d589 LL |
1765 | |
1766 | if (!tty || tty->magic != TTY_MAGIC) | |
1767 | return ret; | |
1768 | ||
1769 | un = tty->driver_data; | |
1770 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1771 | return ret; | |
1772 | ||
1773 | ch = un->un_ch; | |
1774 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1775 | return ret; | |
1776 | ||
1777 | bd = ch->ch_bd; | |
1778 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1779 | return ret; | |
1780 | ||
1781 | switch (msec) { | |
1782 | case -1: | |
1783 | msec = 0xFFFF; | |
1784 | break; | |
1785 | case 0: | |
1786 | msec = 0; | |
1787 | break; | |
1788 | default: | |
1789 | break; | |
1790 | } | |
1791 | ||
a44b508a | 1792 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1793 | |
1794 | ch->ch_bd->bd_ops->send_break(ch, msec); | |
1795 | ||
a44b508a | 1796 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1797 | |
8f90ef80 | 1798 | return 0; |
0b99d589 LL |
1799 | } |
1800 | ||
0b99d589 LL |
1801 | /* |
1802 | * dgnc_tty_wait_until_sent() | |
1803 | * | |
1804 | * wait until data has been transmitted, called by ld. | |
1805 | */ | |
1806 | static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
1807 | { | |
03425f55 | 1808 | struct dgnc_board *bd; |
0b99d589 LL |
1809 | struct channel_t *ch; |
1810 | struct un_t *un; | |
0b99d589 LL |
1811 | |
1812 | if (!tty || tty->magic != TTY_MAGIC) | |
1813 | return; | |
1814 | ||
1815 | un = tty->driver_data; | |
1816 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1817 | return; | |
1818 | ||
1819 | ch = un->un_ch; | |
1820 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1821 | return; | |
1822 | ||
1823 | bd = ch->ch_bd; | |
1824 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1825 | return; | |
1826 | ||
2d9920ec | 1827 | bd->bd_ops->drain(tty, 0); |
8b07d521 | 1828 | } |
0b99d589 | 1829 | |
0b99d589 LL |
1830 | /* |
1831 | * dgnc_send_xchar() | |
1832 | * | |
1833 | * send a high priority character, called by ld. | |
1834 | */ | |
1835 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char c) | |
1836 | { | |
03425f55 | 1837 | struct dgnc_board *bd; |
0b99d589 LL |
1838 | struct channel_t *ch; |
1839 | struct un_t *un; | |
a44b508a | 1840 | unsigned long flags; |
0b99d589 LL |
1841 | |
1842 | if (!tty || tty->magic != TTY_MAGIC) | |
1843 | return; | |
1844 | ||
1845 | un = tty->driver_data; | |
1846 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1847 | return; | |
1848 | ||
1849 | ch = un->un_ch; | |
1850 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1851 | return; | |
1852 | ||
1853 | bd = ch->ch_bd; | |
1854 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1855 | return; | |
1856 | ||
f3dadd29 | 1857 | dev_dbg(tty->dev, "dgnc_tty_send_xchar start\n"); |
0b99d589 | 1858 | |
a44b508a | 1859 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1860 | bd->bd_ops->send_immediate_char(ch, c); |
a44b508a | 1861 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1862 | |
f3dadd29 | 1863 | dev_dbg(tty->dev, "dgnc_tty_send_xchar finish\n"); |
8b07d521 | 1864 | } |
0b99d589 | 1865 | |
7127fa28 WF |
1866 | /* Return modem signals to ld. */ |
1867 | ||
0b99d589 LL |
1868 | static inline int dgnc_get_mstat(struct channel_t *ch) |
1869 | { | |
1870 | unsigned char mstat; | |
290e3aba | 1871 | int result = 0; |
a44b508a | 1872 | unsigned long flags; |
0b99d589 | 1873 | |
0b99d589 | 1874 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
8f90ef80 | 1875 | return -ENXIO; |
0b99d589 | 1876 | |
a44b508a | 1877 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1878 | |
0b7ceaa6 | 1879 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1880 | |
a44b508a | 1881 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1882 | |
0b99d589 LL |
1883 | if (mstat & UART_MCR_DTR) |
1884 | result |= TIOCM_DTR; | |
1885 | if (mstat & UART_MCR_RTS) | |
1886 | result |= TIOCM_RTS; | |
1887 | if (mstat & UART_MSR_CTS) | |
1888 | result |= TIOCM_CTS; | |
1889 | if (mstat & UART_MSR_DSR) | |
1890 | result |= TIOCM_DSR; | |
1891 | if (mstat & UART_MSR_RI) | |
1892 | result |= TIOCM_RI; | |
1893 | if (mstat & UART_MSR_DCD) | |
1894 | result |= TIOCM_CD; | |
1895 | ||
8f90ef80 | 1896 | return result; |
0b99d589 LL |
1897 | } |
1898 | ||
7127fa28 WF |
1899 | /* Return modem signals to ld. */ |
1900 | ||
851f306d CM |
1901 | static int dgnc_get_modem_info(struct channel_t *ch, |
1902 | unsigned int __user *value) | |
0b99d589 | 1903 | { |
a5b90ef7 | 1904 | return put_user(dgnc_get_mstat(ch), value); |
0b99d589 LL |
1905 | } |
1906 | ||
0b99d589 LL |
1907 | /* |
1908 | * dgnc_set_modem_info() | |
1909 | * | |
1910 | * Set modem signals, called by ld. | |
1911 | */ | |
c23b48e0 | 1912 | static int dgnc_set_modem_info(struct channel_t *ch, |
851f306d CM |
1913 | unsigned int command, |
1914 | unsigned int __user *value) | |
0b99d589 | 1915 | { |
0b99d589 LL |
1916 | int ret = -ENXIO; |
1917 | unsigned int arg = 0; | |
a44b508a | 1918 | unsigned long flags; |
0b99d589 | 1919 | |
0b99d589 LL |
1920 | ret = get_user(arg, value); |
1921 | if (ret) | |
8f90ef80 | 1922 | return ret; |
0b99d589 LL |
1923 | |
1924 | switch (command) { | |
1925 | case TIOCMBIS: | |
50667c67 | 1926 | if (arg & TIOCM_RTS) |
0b99d589 | 1927 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 1928 | |
50667c67 | 1929 | if (arg & TIOCM_DTR) |
0b99d589 | 1930 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 LL |
1931 | |
1932 | break; | |
1933 | ||
1934 | case TIOCMBIC: | |
50667c67 | 1935 | if (arg & TIOCM_RTS) |
0b99d589 | 1936 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 1937 | |
50667c67 | 1938 | if (arg & TIOCM_DTR) |
0b99d589 | 1939 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
1940 | |
1941 | break; | |
1942 | ||
90d2a471 | 1943 | case TIOCMSET: |
0b99d589 | 1944 | |
50667c67 | 1945 | if (arg & TIOCM_RTS) |
0b99d589 | 1946 | ch->ch_mostat |= UART_MCR_RTS; |
50667c67 | 1947 | else |
0b99d589 | 1948 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 1949 | |
50667c67 | 1950 | if (arg & TIOCM_DTR) |
0b99d589 | 1951 | ch->ch_mostat |= UART_MCR_DTR; |
50667c67 | 1952 | else |
0b99d589 | 1953 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
1954 | |
1955 | break; | |
1956 | ||
1957 | default: | |
8f90ef80 | 1958 | return -EINVAL; |
0b99d589 LL |
1959 | } |
1960 | ||
a44b508a | 1961 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1962 | |
1963 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
1964 | ||
a44b508a | 1965 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1966 | |
8f90ef80 | 1967 | return 0; |
0b99d589 LL |
1968 | } |
1969 | ||
0b99d589 | 1970 | /* |
8b07d521 | 1971 | * dgnc_tty_digigeta() |
0b99d589 LL |
1972 | * |
1973 | * Ioctl to get the information for ditty. | |
0b99d589 | 1974 | */ |
851f306d CM |
1975 | static int dgnc_tty_digigeta(struct tty_struct *tty, |
1976 | struct digi_t __user *retinfo) | |
0b99d589 LL |
1977 | { |
1978 | struct channel_t *ch; | |
1979 | struct un_t *un; | |
1980 | struct digi_t tmp; | |
a44b508a | 1981 | unsigned long flags; |
0b99d589 LL |
1982 | |
1983 | if (!retinfo) | |
8f90ef80 | 1984 | return -EFAULT; |
0b99d589 LL |
1985 | |
1986 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 1987 | return -EFAULT; |
0b99d589 LL |
1988 | |
1989 | un = tty->driver_data; | |
1990 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1991 | return -EFAULT; |
0b99d589 LL |
1992 | |
1993 | ch = un->un_ch; | |
1994 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1995 | return -EFAULT; |
0b99d589 LL |
1996 | |
1997 | memset(&tmp, 0, sizeof(tmp)); | |
1998 | ||
a44b508a | 1999 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2000 | memcpy(&tmp, &ch->ch_digi, sizeof(tmp)); |
a44b508a | 2001 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2002 | |
2003 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) | |
8f90ef80 | 2004 | return -EFAULT; |
0b99d589 | 2005 | |
8f90ef80 | 2006 | return 0; |
0b99d589 LL |
2007 | } |
2008 | ||
0b99d589 | 2009 | /* |
8b07d521 | 2010 | * dgnc_tty_digiseta() |
0b99d589 LL |
2011 | * |
2012 | * Ioctl to set the information for ditty. | |
0b99d589 | 2013 | */ |
851f306d CM |
2014 | static int dgnc_tty_digiseta(struct tty_struct *tty, |
2015 | struct digi_t __user *new_info) | |
0b99d589 | 2016 | { |
03425f55 | 2017 | struct dgnc_board *bd; |
0b99d589 LL |
2018 | struct channel_t *ch; |
2019 | struct un_t *un; | |
2020 | struct digi_t new_digi; | |
a44b508a | 2021 | unsigned long flags; |
0b99d589 | 2022 | |
0b99d589 | 2023 | if (!tty || tty->magic != TTY_MAGIC) |
8f90ef80 | 2024 | return -EFAULT; |
0b99d589 LL |
2025 | |
2026 | un = tty->driver_data; | |
2027 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2028 | return -EFAULT; |
0b99d589 LL |
2029 | |
2030 | ch = un->un_ch; | |
2031 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2032 | return -EFAULT; |
0b99d589 LL |
2033 | |
2034 | bd = ch->ch_bd; | |
2035 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2036 | return -EFAULT; |
0b99d589 | 2037 | |
f1e51745 | 2038 | if (copy_from_user(&new_digi, new_info, sizeof(new_digi))) |
8f90ef80 | 2039 | return -EFAULT; |
0b99d589 | 2040 | |
a44b508a | 2041 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2042 | |
16465dcd | 2043 | /* Handle transitions to and from RTS Toggle. */ |
7127fa28 | 2044 | |
851f306d CM |
2045 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2046 | (new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 | 2047 | ch->ch_mostat &= ~(UART_MCR_RTS); |
851f306d CM |
2048 | if ((ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2049 | !(new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 LL |
2050 | ch->ch_mostat |= (UART_MCR_RTS); |
2051 | ||
16465dcd | 2052 | /* Handle transitions to and from DTR Toggle. */ |
7127fa28 | 2053 | |
851f306d CM |
2054 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2055 | (new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 | 2056 | ch->ch_mostat &= ~(UART_MCR_DTR); |
851f306d CM |
2057 | if ((ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2058 | !(new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 LL |
2059 | ch->ch_mostat |= (UART_MCR_DTR); |
2060 | ||
a07bf39a | 2061 | memcpy(&ch->ch_digi, &new_digi, sizeof(new_digi)); |
0b99d589 | 2062 | |
8b07d521 | 2063 | if (ch->ch_digi.digi_maxcps < 1) |
0b99d589 LL |
2064 | ch->ch_digi.digi_maxcps = 1; |
2065 | ||
8b07d521 | 2066 | if (ch->ch_digi.digi_maxcps > 10000) |
0b99d589 LL |
2067 | ch->ch_digi.digi_maxcps = 10000; |
2068 | ||
2069 | if (ch->ch_digi.digi_bufsize < 10) | |
2070 | ch->ch_digi.digi_bufsize = 10; | |
2071 | ||
2072 | if (ch->ch_digi.digi_maxchar < 1) | |
2073 | ch->ch_digi.digi_maxchar = 1; | |
2074 | ||
2075 | if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize) | |
2076 | ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize; | |
2077 | ||
2078 | if (ch->ch_digi.digi_onlen > DIGI_PLEN) | |
2079 | ch->ch_digi.digi_onlen = DIGI_PLEN; | |
2080 | ||
2081 | if (ch->ch_digi.digi_offlen > DIGI_PLEN) | |
2082 | ch->ch_digi.digi_offlen = DIGI_PLEN; | |
2083 | ||
2084 | ch->ch_bd->bd_ops->param(tty); | |
2085 | ||
a44b508a | 2086 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2087 | |
8f90ef80 | 2088 | return 0; |
0b99d589 LL |
2089 | } |
2090 | ||
7127fa28 WF |
2091 | /* dgnc_set_termios() */ |
2092 | ||
851f306d CM |
2093 | static void dgnc_tty_set_termios(struct tty_struct *tty, |
2094 | struct ktermios *old_termios) | |
0b99d589 | 2095 | { |
03425f55 | 2096 | struct dgnc_board *bd; |
0b99d589 LL |
2097 | struct channel_t *ch; |
2098 | struct un_t *un; | |
a44b508a | 2099 | unsigned long flags; |
0b99d589 LL |
2100 | |
2101 | if (!tty || tty->magic != TTY_MAGIC) | |
2102 | return; | |
2103 | ||
2104 | un = tty->driver_data; | |
2105 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2106 | return; | |
2107 | ||
2108 | ch = un->un_ch; | |
2109 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2110 | return; | |
2111 | ||
2112 | bd = ch->ch_bd; | |
2113 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2114 | return; | |
2115 | ||
a44b508a | 2116 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2117 | |
22e3de76 LL |
2118 | ch->ch_c_cflag = tty->termios.c_cflag; |
2119 | ch->ch_c_iflag = tty->termios.c_iflag; | |
2120 | ch->ch_c_oflag = tty->termios.c_oflag; | |
2121 | ch->ch_c_lflag = tty->termios.c_lflag; | |
2122 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
2123 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
2124 | |
2125 | ch->ch_bd->bd_ops->param(tty); | |
2126 | dgnc_carrier(ch); | |
2127 | ||
a44b508a | 2128 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2129 | } |
2130 | ||
0b99d589 LL |
2131 | static void dgnc_tty_throttle(struct tty_struct *tty) |
2132 | { | |
2133 | struct channel_t *ch; | |
2134 | struct un_t *un; | |
a44b508a | 2135 | unsigned long flags; |
0b99d589 LL |
2136 | |
2137 | if (!tty || tty->magic != TTY_MAGIC) | |
2138 | return; | |
2139 | ||
2140 | un = tty->driver_data; | |
2141 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2142 | return; | |
8b07d521 | 2143 | |
90d2a471 LL |
2144 | ch = un->un_ch; |
2145 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2146 | return; | |
0b99d589 | 2147 | |
a44b508a | 2148 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2149 | |
2150 | ch->ch_flags |= (CH_FORCED_STOPI); | |
2151 | ||
a44b508a | 2152 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2153 | } |
2154 | ||
0b99d589 LL |
2155 | static void dgnc_tty_unthrottle(struct tty_struct *tty) |
2156 | { | |
2157 | struct channel_t *ch; | |
2158 | struct un_t *un; | |
a44b508a | 2159 | unsigned long flags; |
0b99d589 LL |
2160 | |
2161 | if (!tty || tty->magic != TTY_MAGIC) | |
2162 | return; | |
2163 | ||
2164 | un = tty->driver_data; | |
2165 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2166 | return; | |
8b07d521 | 2167 | |
90d2a471 LL |
2168 | ch = un->un_ch; |
2169 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2170 | return; | |
0b99d589 | 2171 | |
a44b508a | 2172 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2173 | |
2174 | ch->ch_flags &= ~(CH_FORCED_STOPI); | |
2175 | ||
a44b508a | 2176 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2177 | } |
2178 | ||
0b99d589 LL |
2179 | static void dgnc_tty_start(struct tty_struct *tty) |
2180 | { | |
03425f55 | 2181 | struct dgnc_board *bd; |
0b99d589 LL |
2182 | struct channel_t *ch; |
2183 | struct un_t *un; | |
a44b508a | 2184 | unsigned long flags; |
0b99d589 LL |
2185 | |
2186 | if (!tty || tty->magic != TTY_MAGIC) | |
2187 | return; | |
2188 | ||
2189 | un = tty->driver_data; | |
2190 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2191 | return; | |
8b07d521 | 2192 | |
90d2a471 LL |
2193 | ch = un->un_ch; |
2194 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2195 | return; | |
0b99d589 LL |
2196 | |
2197 | bd = ch->ch_bd; | |
2198 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2199 | return; | |
2200 | ||
a44b508a | 2201 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2202 | |
2203 | ch->ch_flags &= ~(CH_FORCED_STOP); | |
2204 | ||
a44b508a | 2205 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2206 | } |
2207 | ||
0b99d589 LL |
2208 | static void dgnc_tty_stop(struct tty_struct *tty) |
2209 | { | |
03425f55 | 2210 | struct dgnc_board *bd; |
0b99d589 LL |
2211 | struct channel_t *ch; |
2212 | struct un_t *un; | |
a44b508a | 2213 | unsigned long flags; |
0b99d589 LL |
2214 | |
2215 | if (!tty || tty->magic != TTY_MAGIC) | |
2216 | return; | |
2217 | ||
2218 | un = tty->driver_data; | |
2219 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2220 | return; | |
8b07d521 | 2221 | |
90d2a471 LL |
2222 | ch = un->un_ch; |
2223 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2224 | return; | |
0b99d589 LL |
2225 | |
2226 | bd = ch->ch_bd; | |
2227 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2228 | return; | |
2229 | ||
a44b508a | 2230 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2231 | |
2232 | ch->ch_flags |= (CH_FORCED_STOP); | |
2233 | ||
a44b508a | 2234 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2235 | } |
2236 | ||
8b07d521 | 2237 | /* |
0b99d589 LL |
2238 | * dgnc_tty_flush_chars() |
2239 | * | |
2240 | * Flush the cook buffer | |
2241 | * | |
2242 | * Note to self, and any other poor souls who venture here: | |
2243 | * | |
2244 | * flush in this case DOES NOT mean dispose of the data. | |
2245 | * instead, it means "stop buffering and send it if you | |
2246 | * haven't already." Just guess how I figured that out... SRW 2-Jun-98 | |
2247 | * | |
2248 | * It is also always called in interrupt context - JAR 8-Sept-99 | |
2249 | */ | |
2250 | static void dgnc_tty_flush_chars(struct tty_struct *tty) | |
2251 | { | |
03425f55 | 2252 | struct dgnc_board *bd; |
0b99d589 LL |
2253 | struct channel_t *ch; |
2254 | struct un_t *un; | |
a44b508a | 2255 | unsigned long flags; |
0b99d589 LL |
2256 | |
2257 | if (!tty || tty->magic != TTY_MAGIC) | |
2258 | return; | |
2259 | ||
2260 | un = tty->driver_data; | |
2261 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2262 | return; | |
8b07d521 | 2263 | |
90d2a471 LL |
2264 | ch = un->un_ch; |
2265 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2266 | return; | |
0b99d589 LL |
2267 | |
2268 | bd = ch->ch_bd; | |
2269 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2270 | return; | |
2271 | ||
a44b508a | 2272 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2273 | |
2274 | /* Do something maybe here */ | |
2275 | ||
a44b508a | 2276 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2277 | } |
2278 | ||
0b99d589 LL |
2279 | /* |
2280 | * dgnc_tty_flush_buffer() | |
8b07d521 | 2281 | * |
0b99d589 LL |
2282 | * Flush Tx buffer (make in == out) |
2283 | */ | |
2284 | static void dgnc_tty_flush_buffer(struct tty_struct *tty) | |
2285 | { | |
2286 | struct channel_t *ch; | |
2287 | struct un_t *un; | |
a44b508a | 2288 | unsigned long flags; |
0b99d589 LL |
2289 | |
2290 | if (!tty || tty->magic != TTY_MAGIC) | |
2291 | return; | |
2292 | ||
2293 | un = tty->driver_data; | |
2294 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2295 | return; | |
8b07d521 | 2296 | |
90d2a471 LL |
2297 | ch = un->un_ch; |
2298 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2299 | return; | |
0b99d589 | 2300 | |
a44b508a | 2301 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2302 | |
2303 | ch->ch_flags &= ~CH_STOP; | |
2304 | ||
2305 | /* Flush our write queue */ | |
2306 | ch->ch_w_head = ch->ch_w_tail; | |
2307 | ||
2308 | /* Flush UARTs transmit FIFO */ | |
2309 | ch->ch_bd->bd_ops->flush_uart_write(ch); | |
2310 | ||
adcb56f9 RS |
2311 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
2312 | ch->ch_tun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2313 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2314 | } | |
adcb56f9 RS |
2315 | if (ch->ch_pun.un_flags & (UN_LOW | UN_EMPTY)) { |
2316 | ch->ch_pun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2317 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2318 | } | |
2319 | ||
a44b508a | 2320 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2321 | } |
2322 | ||
7127fa28 | 2323 | /* The IOCTL function and all of its helpers */ |
8b07d521 | 2324 | |
0b99d589 LL |
2325 | /* |
2326 | * dgnc_tty_ioctl() | |
2327 | * | |
2328 | * The usual assortment of ioctl's | |
2329 | */ | |
a31cefa2 | 2330 | static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
e352d3f1 | 2331 | unsigned long arg) |
0b99d589 | 2332 | { |
03425f55 | 2333 | struct dgnc_board *bd; |
8670a56f | 2334 | struct board_ops *ch_bd_ops; |
0b99d589 LL |
2335 | struct channel_t *ch; |
2336 | struct un_t *un; | |
2337 | int rc; | |
a44b508a | 2338 | unsigned long flags; |
6f418259 | 2339 | void __user *uarg = (void __user *)arg; |
0b99d589 LL |
2340 | |
2341 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2342 | return -ENODEV; |
0b99d589 LL |
2343 | |
2344 | un = tty->driver_data; | |
2345 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2346 | return -ENODEV; |
0b99d589 LL |
2347 | |
2348 | ch = un->un_ch; | |
2349 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2350 | return -ENODEV; |
0b99d589 LL |
2351 | |
2352 | bd = ch->ch_bd; | |
2353 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2354 | return -ENODEV; |
0b99d589 | 2355 | |
8670a56f DY |
2356 | ch_bd_ops = bd->bd_ops; |
2357 | ||
a44b508a | 2358 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2359 | |
2360 | if (un->un_open_count <= 0) { | |
a44b508a | 2361 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2362 | return -EIO; |
0b99d589 LL |
2363 | } |
2364 | ||
2365 | switch (cmd) { | |
0b99d589 LL |
2366 | /* Here are all the standard ioctl's that we MUST implement */ |
2367 | ||
2368 | case TCSBRK: | |
2369 | /* | |
8b07d521 | 2370 | * TCSBRK is SVID version: non-zero arg --> no break |
0b99d589 LL |
2371 | * this behaviour is exploited by tcdrain(). |
2372 | * | |
2373 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be | |
2374 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2375 | * in the middle: 0.375 seconds. | |
2376 | */ | |
2377 | rc = tty_check_change(tty); | |
a44b508a | 2378 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2379 | if (rc) |
8f90ef80 | 2380 | return rc; |
0b99d589 | 2381 | |
8670a56f | 2382 | rc = ch_bd_ops->drain(tty, 0); |
0b99d589 | 2383 | |
f1e51745 | 2384 | if (rc) |
8f90ef80 | 2385 | return -EINTR; |
0b99d589 | 2386 | |
a44b508a | 2387 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2388 | |
3c4019d3 | 2389 | if (((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP)) |
8670a56f | 2390 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2391 | |
a44b508a | 2392 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2393 | |
8f90ef80 | 2394 | return 0; |
0b99d589 | 2395 | |
0b99d589 | 2396 | case TCSBRKP: |
7127fa28 WF |
2397 | /* |
2398 | * support for POSIX tcsendbreak() | |
0b99d589 LL |
2399 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be |
2400 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2401 | * in the middle: 0.375 seconds. | |
2402 | */ | |
2403 | rc = tty_check_change(tty); | |
a44b508a | 2404 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2405 | if (rc) |
8f90ef80 | 2406 | return rc; |
0b99d589 | 2407 | |
8670a56f | 2408 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2409 | if (rc) |
8f90ef80 | 2410 | return -EINTR; |
0b99d589 | 2411 | |
a44b508a | 2412 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2413 | |
8670a56f | 2414 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2415 | |
a44b508a | 2416 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2417 | |
8f90ef80 | 2418 | return 0; |
0b99d589 LL |
2419 | |
2420 | case TIOCSBRK: | |
2421 | rc = tty_check_change(tty); | |
a44b508a | 2422 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2423 | if (rc) |
8f90ef80 | 2424 | return rc; |
0b99d589 | 2425 | |
8670a56f | 2426 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2427 | if (rc) |
8f90ef80 | 2428 | return -EINTR; |
0b99d589 | 2429 | |
a44b508a | 2430 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2431 | |
8670a56f | 2432 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2433 | |
a44b508a | 2434 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2435 | |
8f90ef80 | 2436 | return 0; |
0b99d589 LL |
2437 | |
2438 | case TIOCCBRK: | |
2439 | /* Do Nothing */ | |
a44b508a | 2440 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2441 | return 0; |
2442 | ||
2443 | case TIOCGSOFTCAR: | |
2444 | ||
a44b508a | 2445 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2446 | |
106d43f1 RS |
2447 | return put_user(C_CLOCAL(tty) ? 1 : 0, |
2448 | (unsigned long __user *)arg); | |
0b99d589 LL |
2449 | |
2450 | case TIOCSSOFTCAR: | |
2451 | ||
a44b508a | 2452 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2453 | rc = get_user(arg, (unsigned long __user *)arg); |
0b99d589 | 2454 | if (rc) |
8f90ef80 | 2455 | return rc; |
0b99d589 | 2456 | |
a44b508a | 2457 | spin_lock_irqsave(&ch->ch_lock, flags); |
851f306d CM |
2458 | tty->termios.c_cflag = ((tty->termios.c_cflag & ~CLOCAL) | |
2459 | (arg ? CLOCAL : 0)); | |
8670a56f | 2460 | ch_bd_ops->param(tty); |
a44b508a | 2461 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2462 | |
8f90ef80 | 2463 | return 0; |
8b07d521 | 2464 | |
0b99d589 | 2465 | case TIOCMGET: |
a44b508a | 2466 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2467 | return dgnc_get_modem_info(ch, uarg); |
0b99d589 LL |
2468 | |
2469 | case TIOCMBIS: | |
2470 | case TIOCMBIC: | |
2471 | case TIOCMSET: | |
a44b508a | 2472 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
c23b48e0 | 2473 | return dgnc_set_modem_info(ch, cmd, uarg); |
0b99d589 | 2474 | |
7127fa28 | 2475 | /* Here are any additional ioctl's that we want to implement */ |
8b07d521 LL |
2476 | |
2477 | case TCFLSH: | |
0b99d589 LL |
2478 | /* |
2479 | * The linux tty driver doesn't have a flush | |
2480 | * input routine for the driver, assuming all backed | |
2481 | * up data is in the line disc. buffers. However, | |
2482 | * we all know that's not the case. Here, we | |
2483 | * act on the ioctl, but then lie and say we didn't | |
2484 | * so the line discipline will process the flush | |
2485 | * also. | |
8b07d521 | 2486 | */ |
0b99d589 LL |
2487 | rc = tty_check_change(tty); |
2488 | if (rc) { | |
a44b508a | 2489 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2490 | return rc; |
0b99d589 LL |
2491 | } |
2492 | ||
2493 | if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) { | |
2494 | ch->ch_r_head = ch->ch_r_tail; | |
8670a56f | 2495 | ch_bd_ops->flush_uart_read(ch); |
0b99d589 LL |
2496 | /* Force queue flow control to be released, if needed */ |
2497 | dgnc_check_queue_flow_control(ch); | |
2498 | } | |
2499 | ||
2500 | if ((arg == TCOFLUSH) || (arg == TCIOFLUSH)) { | |
2501 | if (!(un->un_type == DGNC_PRINT)) { | |
2502 | ch->ch_w_head = ch->ch_w_tail; | |
8670a56f | 2503 | ch_bd_ops->flush_uart_write(ch); |
0b99d589 | 2504 | |
24039c58 | 2505 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
851f306d | 2506 | ch->ch_tun.un_flags &= |
adcb56f9 | 2507 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2508 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2509 | } | |
2510 | ||
acca0c1f | 2511 | if (ch->ch_pun.un_flags & (UN_LOW | UN_EMPTY)) { |
851f306d | 2512 | ch->ch_pun.un_flags &= |
adcb56f9 | 2513 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2514 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2515 | } | |
0b99d589 LL |
2516 | } |
2517 | } | |
2518 | ||
8b07d521 | 2519 | /* pretend we didn't recognize this IOCTL */ |
a44b508a | 2520 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2521 | return -ENOIOCTLCMD; |
0b99d589 LL |
2522 | case TCSETSF: |
2523 | case TCSETSW: | |
2524 | /* | |
2525 | * The linux tty driver doesn't have a flush | |
2526 | * input routine for the driver, assuming all backed | |
2527 | * up data is in the line disc. buffers. However, | |
2528 | * we all know that's not the case. Here, we | |
2529 | * act on the ioctl, but then lie and say we didn't | |
2530 | * so the line discipline will process the flush | |
2531 | * also. | |
2532 | */ | |
2533 | if (cmd == TCSETSF) { | |
2534 | /* flush rx */ | |
2535 | ch->ch_flags &= ~CH_STOP; | |
2536 | ch->ch_r_head = ch->ch_r_tail; | |
8670a56f | 2537 | ch_bd_ops->flush_uart_read(ch); |
0b99d589 LL |
2538 | /* Force queue flow control to be released, if needed */ |
2539 | dgnc_check_queue_flow_control(ch); | |
2540 | } | |
2541 | ||
2542 | /* now wait for all the output to drain */ | |
a44b508a | 2543 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2544 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2545 | if (rc) |
8f90ef80 | 2546 | return -EINTR; |
0b99d589 LL |
2547 | |
2548 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2549 | return -ENOIOCTLCMD; |
0b99d589 LL |
2550 | |
2551 | case TCSETAW: | |
2552 | ||
a44b508a | 2553 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2554 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2555 | if (rc) |
8f90ef80 | 2556 | return -EINTR; |
0b99d589 LL |
2557 | |
2558 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2559 | return -ENOIOCTLCMD; |
0b99d589 LL |
2560 | |
2561 | case TCXONC: | |
a44b508a | 2562 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2563 | /* Make the ld do it */ |
8f90ef80 | 2564 | return -ENOIOCTLCMD; |
0b99d589 LL |
2565 | |
2566 | case DIGI_GETA: | |
2567 | /* get information for ditty */ | |
a44b508a | 2568 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2569 | return dgnc_tty_digigeta(tty, uarg); |
0b99d589 LL |
2570 | |
2571 | case DIGI_SETAW: | |
2572 | case DIGI_SETAF: | |
2573 | ||
2574 | /* set information for ditty */ | |
2575 | if (cmd == (DIGI_SETAW)) { | |
a44b508a | 2576 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2577 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 SL |
2578 | |
2579 | if (rc) | |
8f90ef80 | 2580 | return -EINTR; |
f1e51745 | 2581 | |
a44b508a | 2582 | spin_lock_irqsave(&ch->ch_lock, flags); |
2000c581 | 2583 | } else { |
0b99d589 LL |
2584 | tty_ldisc_flush(tty); |
2585 | } | |
2586 | /* fall thru */ | |
2587 | ||
2588 | case DIGI_SETA: | |
a44b508a | 2589 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2590 | return dgnc_tty_digiseta(tty, uarg); |
8b07d521 | 2591 | |
0b99d589 LL |
2592 | case DIGI_LOOPBACK: |
2593 | { | |
2594 | uint loopback = 0; | |
7127fa28 WF |
2595 | /* |
2596 | * Let go of locks when accessing user space, | |
851f306d | 2597 | * could sleep |
9d5b4d83 | 2598 | */ |
a44b508a | 2599 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2600 | rc = get_user(loopback, (unsigned int __user *)arg); |
0b99d589 | 2601 | if (rc) |
8f90ef80 | 2602 | return rc; |
a44b508a | 2603 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2604 | |
8b07d521 | 2605 | /* Enable/disable internal loopback for this port */ |
0b99d589 LL |
2606 | if (loopback) |
2607 | ch->ch_flags |= CH_LOOPBACK; | |
2608 | else | |
2609 | ch->ch_flags &= ~(CH_LOOPBACK); | |
2610 | ||
8670a56f | 2611 | ch_bd_ops->param(tty); |
a44b508a | 2612 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2613 | return 0; |
90d2a471 | 2614 | } |
0b99d589 LL |
2615 | |
2616 | case DIGI_GETCUSTOMBAUD: | |
a44b508a | 2617 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
106d43f1 RS |
2618 | return put_user(ch->ch_custom_speed, |
2619 | (unsigned int __user *)arg); | |
0b99d589 LL |
2620 | |
2621 | case DIGI_SETCUSTOMBAUD: | |
2622 | { | |
93c76c9c | 2623 | int new_rate; |
0b99d589 | 2624 | /* Let go of locks when accessing user space, could sleep */ |
a44b508a | 2625 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2626 | rc = get_user(new_rate, (int __user *)arg); |
0b99d589 | 2627 | if (rc) |
8f90ef80 | 2628 | return rc; |
a44b508a | 2629 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2630 | dgnc_set_custom_speed(ch, new_rate); |
8670a56f | 2631 | ch_bd_ops->param(tty); |
a44b508a | 2632 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2633 | return 0; |
90d2a471 | 2634 | } |
0b99d589 LL |
2635 | |
2636 | /* | |
2637 | * This ioctl allows insertion of a character into the front | |
2638 | * of any pending data to be transmitted. | |
2639 | * | |
16465dcd | 2640 | * This ioctl is to satisfy the "Send Character Immediate" |
0b99d589 LL |
2641 | * call that the RealPort protocol spec requires. |
2642 | */ | |
2643 | case DIGI_REALPORT_SENDIMMEDIATE: | |
2644 | { | |
2645 | unsigned char c; | |
0eaa02e6 | 2646 | |
a44b508a | 2647 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2648 | rc = get_user(c, (unsigned char __user *)arg); |
0b99d589 | 2649 | if (rc) |
8f90ef80 | 2650 | return rc; |
a44b508a | 2651 | spin_lock_irqsave(&ch->ch_lock, flags); |
8670a56f | 2652 | ch_bd_ops->send_immediate_char(ch, c); |
a44b508a | 2653 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2654 | return 0; |
0b99d589 LL |
2655 | } |
2656 | ||
2657 | /* | |
2658 | * This ioctl returns all the current counts for the port. | |
2659 | * | |
16465dcd | 2660 | * This ioctl is to satisfy the "Line Error Counters" |
0b99d589 LL |
2661 | * call that the RealPort protocol spec requires. |
2662 | */ | |
2663 | case DIGI_REALPORT_GETCOUNTERS: | |
2664 | { | |
2665 | struct digi_getcounter buf; | |
2666 | ||
2667 | buf.norun = ch->ch_err_overrun; | |
feba47a7 | 2668 | buf.noflow = 0; /* The driver doesn't keep this stat */ |
0b99d589 LL |
2669 | buf.nframe = ch->ch_err_frame; |
2670 | buf.nparity = ch->ch_err_parity; | |
2671 | buf.nbreak = ch->ch_err_break; | |
2672 | buf.rbytes = ch->ch_rxcount; | |
2673 | buf.tbytes = ch->ch_txcount; | |
2674 | ||
a44b508a | 2675 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2676 | |
50667c67 | 2677 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2678 | return -EFAULT; |
50667c67 | 2679 | |
8f90ef80 | 2680 | return 0; |
0b99d589 LL |
2681 | } |
2682 | ||
2683 | /* | |
2684 | * This ioctl returns all current events. | |
2685 | * | |
16465dcd | 2686 | * This ioctl is to satisfy the "Event Reporting" |
0b99d589 | 2687 | * call that the RealPort protocol spec requires. |
90d2a471 | 2688 | */ |
0b99d589 LL |
2689 | case DIGI_REALPORT_GETEVENTS: |
2690 | { | |
2691 | unsigned int events = 0; | |
2692 | ||
2693 | /* NOTE: MORE EVENTS NEEDS TO BE ADDED HERE */ | |
2694 | if (ch->ch_flags & CH_BREAK_SENDING) | |
2695 | events |= EV_TXB; | |
851f306d CM |
2696 | if ((ch->ch_flags & CH_STOP) || |
2697 | (ch->ch_flags & CH_FORCED_STOP)) | |
0b99d589 | 2698 | events |= (EV_OPU | EV_OPS); |
50667c67 | 2699 | |
851f306d CM |
2700 | if ((ch->ch_flags & CH_STOPI) || |
2701 | (ch->ch_flags & CH_FORCED_STOPI)) | |
0b99d589 | 2702 | events |= (EV_IPU | EV_IPS); |
0b99d589 | 2703 | |
a44b508a | 2704 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
106d43f1 | 2705 | return put_user(events, (unsigned int __user *)arg); |
0b99d589 LL |
2706 | } |
2707 | ||
2708 | /* | |
2709 | * This ioctl returns TOUT and TIN counters based | |
2710 | * upon the values passed in by the RealPort Server. | |
2711 | * It also passes back whether the UART Transmitter is | |
2712 | * empty as well. | |
90d2a471 | 2713 | */ |
0b99d589 LL |
2714 | case DIGI_REALPORT_GETBUFFERS: |
2715 | { | |
2716 | struct digi_getbuffer buf; | |
2717 | int tdist; | |
2718 | int count; | |
2719 | ||
a44b508a | 2720 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2721 | |
7127fa28 WF |
2722 | /* Get data from user first. */ |
2723 | ||
50667c67 | 2724 | if (copy_from_user(&buf, uarg, sizeof(buf))) |
8f90ef80 | 2725 | return -EFAULT; |
0b99d589 | 2726 | |
a44b508a | 2727 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2728 | |
7127fa28 WF |
2729 | /* Figure out how much data is in our RX and TX queues. */ |
2730 | ||
0b99d589 LL |
2731 | buf.rxbuf = (ch->ch_r_head - ch->ch_r_tail) & RQUEUEMASK; |
2732 | buf.txbuf = (ch->ch_w_head - ch->ch_w_tail) & WQUEUEMASK; | |
2733 | ||
7127fa28 WF |
2734 | /* Is the UART empty? Add that value to whats in our TX queue. */ |
2735 | ||
8670a56f | 2736 | count = buf.txbuf + ch_bd_ops->get_uart_bytes_left(ch); |
0b99d589 LL |
2737 | |
2738 | /* | |
2739 | * Figure out how much data the RealPort Server believes should | |
2740 | * be in our TX queue. | |
2741 | */ | |
b9f84637 | 2742 | tdist = (buf.tx_in - buf.tx_out) & 0xffff; |
0b99d589 LL |
2743 | |
2744 | /* | |
2745 | * If we have more data than the RealPort Server believes we | |
2746 | * should have, reduce our count to its amount. | |
2747 | * | |
2748 | * This count difference CAN happen because the Linux LD can | |
2749 | * insert more characters into our queue for OPOST processing | |
2750 | * that the RealPort Server doesn't know about. | |
2751 | */ | |
50667c67 | 2752 | if (buf.txbuf > tdist) |
0b99d589 | 2753 | buf.txbuf = tdist; |
0b99d589 | 2754 | |
7127fa28 WF |
2755 | /* Report whether our queue and UART TX are completely empty. */ |
2756 | ||
50667c67 | 2757 | if (count) |
0b99d589 | 2758 | buf.txdone = 0; |
50667c67 | 2759 | else |
0b99d589 | 2760 | buf.txdone = 1; |
0b99d589 | 2761 | |
a44b508a | 2762 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2763 | |
50667c67 | 2764 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2765 | return -EFAULT; |
50667c67 | 2766 | |
8f90ef80 | 2767 | return 0; |
0b99d589 LL |
2768 | } |
2769 | default: | |
a44b508a | 2770 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2771 | |
8f90ef80 | 2772 | return -ENOIOCTLCMD; |
0b99d589 | 2773 | } |
0b99d589 | 2774 | } |