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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> | |
174cd4b1 | 22 | #include <linux/sched/signal.h> /* For jiffies, task states, etc. */ |
0b99d589 LL |
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 | 104 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char ch); |
9b33f918 FA |
105 | static void dgnc_set_signal_low(struct channel_t *ch, const unsigned char line); |
106 | static void dgnc_wake_up_unit(struct un_t *unit); | |
0b99d589 | 107 | |
0b99d589 LL |
108 | static const struct tty_operations dgnc_tty_ops = { |
109 | .open = dgnc_tty_open, | |
110 | .close = dgnc_tty_close, | |
111 | .write = dgnc_tty_write, | |
112 | .write_room = dgnc_tty_write_room, | |
113 | .flush_buffer = dgnc_tty_flush_buffer, | |
114 | .chars_in_buffer = dgnc_tty_chars_in_buffer, | |
115 | .flush_chars = dgnc_tty_flush_chars, | |
116 | .ioctl = dgnc_tty_ioctl, | |
117 | .set_termios = dgnc_tty_set_termios, | |
118 | .stop = dgnc_tty_stop, | |
119 | .start = dgnc_tty_start, | |
120 | .throttle = dgnc_tty_throttle, | |
121 | .unthrottle = dgnc_tty_unthrottle, | |
122 | .hangup = dgnc_tty_hangup, | |
123 | .put_char = dgnc_tty_put_char, | |
124 | .tiocmget = dgnc_tty_tiocmget, | |
125 | .tiocmset = dgnc_tty_tiocmset, | |
126 | .break_ctl = dgnc_tty_send_break, | |
127 | .wait_until_sent = dgnc_tty_wait_until_sent, | |
128 | .send_xchar = dgnc_tty_send_xchar | |
129 | }; | |
130 | ||
7127fa28 | 131 | /* TTY Initialization/Cleanup Functions */ |
8b07d521 | 132 | |
0b99d589 LL |
133 | /* |
134 | * dgnc_tty_register() | |
135 | * | |
136 | * Init the tty subsystem for this board. | |
137 | */ | |
03425f55 | 138 | int dgnc_tty_register(struct dgnc_board *brd) |
0b99d589 | 139 | { |
60b3109e | 140 | int rc; |
8b07d521 | 141 | |
60b3109e DY |
142 | brd->serial_driver = tty_alloc_driver(brd->maxports, |
143 | TTY_DRIVER_REAL_RAW | | |
144 | TTY_DRIVER_DYNAMIC_DEV | | |
145 | TTY_DRIVER_HARDWARE_BREAK); | |
0b99d589 | 146 | |
60b3109e DY |
147 | if (IS_ERR(brd->serial_driver)) |
148 | return PTR_ERR(brd->serial_driver); | |
0b99d589 | 149 | |
6841b2a0 CM |
150 | snprintf(brd->serial_name, MAXTTYNAMELEN, "tty_dgnc_%d_", |
151 | brd->boardnum); | |
0b99d589 | 152 | |
60b3109e DY |
153 | brd->serial_driver->name = brd->serial_name; |
154 | brd->serial_driver->name_base = 0; | |
155 | brd->serial_driver->major = 0; | |
156 | brd->serial_driver->minor_start = 0; | |
157 | brd->serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
158 | brd->serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
4efdb370 | 159 | brd->serial_driver->init_termios = default_termios; |
60b3109e | 160 | brd->serial_driver->driver_name = DRVSTR; |
0b99d589 | 161 | |
0b99d589 LL |
162 | /* |
163 | * Entry points for driver. Called by the kernel from | |
164 | * tty_io.c and n_tty.c. | |
165 | */ | |
60b3109e | 166 | tty_set_operations(brd->serial_driver, &dgnc_tty_ops); |
0b99d589 | 167 | |
1cd7c062 DY |
168 | rc = tty_register_driver(brd->serial_driver); |
169 | if (rc < 0) { | |
170 | dev_dbg(&brd->pdev->dev, | |
171 | "Can't register tty device (%d)\n", rc); | |
172 | goto free_serial_driver; | |
0b99d589 LL |
173 | } |
174 | ||
175 | /* | |
176 | * If we're doing transparent print, we have to do all of the above | |
79e30af2 | 177 | * again, separately so we don't get the LD confused about what major |
0b99d589 LL |
178 | * we are when we get into the dgnc_tty_open() routine. |
179 | */ | |
60b3109e DY |
180 | brd->print_driver = tty_alloc_driver(brd->maxports, |
181 | TTY_DRIVER_REAL_RAW | | |
182 | TTY_DRIVER_DYNAMIC_DEV | | |
183 | TTY_DRIVER_HARDWARE_BREAK); | |
0b99d589 | 184 | |
a0ca97b8 DY |
185 | if (IS_ERR(brd->print_driver)) { |
186 | rc = PTR_ERR(brd->print_driver); | |
187 | goto unregister_serial_driver; | |
188 | } | |
0b99d589 | 189 | |
60b3109e | 190 | snprintf(brd->print_name, MAXTTYNAMELEN, "pr_dgnc_%d_", brd->boardnum); |
0b99d589 | 191 | |
60b3109e DY |
192 | brd->print_driver->name = brd->print_name; |
193 | brd->print_driver->name_base = 0; | |
194 | brd->print_driver->major = brd->serial_driver->major; | |
195 | brd->print_driver->minor_start = 0x80; | |
196 | brd->print_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
197 | brd->print_driver->subtype = SERIAL_TYPE_NORMAL; | |
4efdb370 | 198 | brd->print_driver->init_termios = default_termios; |
60b3109e | 199 | brd->print_driver->driver_name = DRVSTR; |
0b99d589 | 200 | |
0b99d589 LL |
201 | /* |
202 | * Entry points for driver. Called by the kernel from | |
203 | * tty_io.c and n_tty.c. | |
204 | */ | |
60b3109e | 205 | tty_set_operations(brd->print_driver, &dgnc_tty_ops); |
0b99d589 | 206 | |
1cd7c062 DY |
207 | rc = tty_register_driver(brd->print_driver); |
208 | if (rc < 0) { | |
209 | dev_dbg(&brd->pdev->dev, | |
210 | "Can't register Transparent Print device(%d)\n", | |
211 | rc); | |
212 | goto free_print_driver; | |
0b99d589 LL |
213 | } |
214 | ||
60b3109e DY |
215 | return 0; |
216 | ||
217 | free_print_driver: | |
218 | put_tty_driver(brd->print_driver); | |
219 | unregister_serial_driver: | |
220 | tty_unregister_driver(brd->serial_driver); | |
221 | free_serial_driver: | |
222 | put_tty_driver(brd->serial_driver); | |
0b99d589 | 223 | |
8f90ef80 | 224 | return rc; |
0b99d589 LL |
225 | } |
226 | ||
eea5fd11 DY |
227 | void dgnc_tty_unregister(struct dgnc_board *brd) |
228 | { | |
229 | tty_unregister_driver(brd->print_driver); | |
230 | tty_unregister_driver(brd->serial_driver); | |
231 | put_tty_driver(brd->print_driver); | |
232 | put_tty_driver(brd->serial_driver); | |
233 | } | |
234 | ||
0b99d589 LL |
235 | /* |
236 | * dgnc_tty_init() | |
237 | * | |
238 | * Init the tty subsystem. Called once per board after board has been | |
239 | * downloaded and init'ed. | |
240 | */ | |
03425f55 | 241 | int dgnc_tty_init(struct dgnc_board *brd) |
0b99d589 LL |
242 | { |
243 | int i; | |
a7a75386 | 244 | void __iomem *vaddr; |
0b99d589 LL |
245 | struct channel_t *ch; |
246 | ||
247 | if (!brd) | |
8f90ef80 | 248 | return -ENXIO; |
0b99d589 | 249 | |
7127fa28 | 250 | /* Initialize board structure elements. */ |
0b99d589 LL |
251 | |
252 | vaddr = brd->re_map_membase; | |
253 | ||
254 | brd->nasync = brd->maxports; | |
255 | ||
0b99d589 | 256 | for (i = 0; i < brd->nasync; i++) { |
fa52d96c GS |
257 | /* |
258 | * Okay to malloc with GFP_KERNEL, we are not at | |
259 | * interrupt context, and there are no locks held. | |
260 | */ | |
261 | brd->channels[i] = kzalloc(sizeof(*brd->channels[i]), | |
262 | GFP_KERNEL); | |
263 | if (!brd->channels[i]) | |
264 | goto err_free_channels; | |
0b99d589 LL |
265 | } |
266 | ||
267 | ch = brd->channels[0]; | |
268 | vaddr = brd->re_map_membase; | |
269 | ||
270 | /* Set up channel variables */ | |
271 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
a44b508a | 272 | spin_lock_init(&ch->ch_lock); |
0b99d589 LL |
273 | |
274 | /* Store all our magic numbers */ | |
275 | ch->magic = DGNC_CHANNEL_MAGIC; | |
276 | ch->ch_tun.magic = DGNC_UNIT_MAGIC; | |
277 | ch->ch_tun.un_ch = ch; | |
278 | ch->ch_tun.un_type = DGNC_SERIAL; | |
279 | ch->ch_tun.un_dev = i; | |
280 | ||
281 | ch->ch_pun.magic = DGNC_UNIT_MAGIC; | |
282 | ch->ch_pun.un_ch = ch; | |
283 | ch->ch_pun.un_type = DGNC_PRINT; | |
284 | ch->ch_pun.un_dev = i + 128; | |
285 | ||
286 | if (brd->bd_uart_offset == 0x200) | |
a7a75386 | 287 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 | 288 | else |
a7a75386 | 289 | ch->ch_cls_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 LL |
290 | |
291 | ch->ch_bd = brd; | |
292 | ch->ch_portnum = i; | |
293 | ch->ch_digi = dgnc_digi_init; | |
294 | ||
295 | /* .25 second delay */ | |
296 | ch->ch_close_delay = 250; | |
297 | ||
298 | init_waitqueue_head(&ch->ch_flags_wait); | |
299 | init_waitqueue_head(&ch->ch_tun.un_flags_wait); | |
300 | init_waitqueue_head(&ch->ch_pun.un_flags_wait); | |
0b99d589 LL |
301 | |
302 | { | |
303 | struct device *classp; | |
0eaa02e6 | 304 | |
60b3109e | 305 | classp = tty_register_device(brd->serial_driver, i, |
7df227c4 | 306 | &ch->ch_bd->pdev->dev); |
0b99d589 | 307 | ch->ch_tun.un_sysfs = classp; |
0b99d589 | 308 | |
60b3109e | 309 | classp = tty_register_device(brd->print_driver, i, |
7df227c4 | 310 | &ch->ch_bd->pdev->dev); |
0b99d589 | 311 | ch->ch_pun.un_sysfs = classp; |
0b99d589 | 312 | } |
0b99d589 LL |
313 | } |
314 | ||
8f90ef80 | 315 | return 0; |
fa52d96c GS |
316 | |
317 | err_free_channels: | |
318 | for (i = i - 1; i >= 0; --i) { | |
319 | kfree(brd->channels[i]); | |
320 | brd->channels[i] = NULL; | |
321 | } | |
322 | return -ENOMEM; | |
0b99d589 LL |
323 | } |
324 | ||
0b99d589 | 325 | /* |
33ccb442 | 326 | * dgnc_cleanup_tty() |
0b99d589 LL |
327 | * |
328 | * Uninitialize the TTY portion of this driver. Free all memory and | |
8b07d521 | 329 | * resources. |
0b99d589 | 330 | */ |
33ccb442 | 331 | void dgnc_cleanup_tty(struct dgnc_board *brd) |
0b99d589 LL |
332 | { |
333 | int i = 0; | |
334 | ||
1eb388b6 | 335 | for (i = 0; i < brd->nasync; i++) |
1cd7c062 | 336 | tty_unregister_device(brd->serial_driver, i); |
1eb388b6 | 337 | |
1cd7c062 | 338 | tty_unregister_driver(brd->serial_driver); |
0b99d589 | 339 | |
1eb388b6 | 340 | for (i = 0; i < brd->nasync; i++) |
1cd7c062 | 341 | tty_unregister_device(brd->print_driver, i); |
1eb388b6 | 342 | |
1cd7c062 | 343 | tty_unregister_driver(brd->print_driver); |
0b99d589 | 344 | |
60b3109e DY |
345 | put_tty_driver(brd->serial_driver); |
346 | put_tty_driver(brd->print_driver); | |
0b99d589 LL |
347 | } |
348 | ||
8e8d27f7 | 349 | /* |
0b99d589 LL |
350 | * dgnc_wmove - Write data to transmit queue. |
351 | * | |
352 | * ch - Pointer to channel structure. | |
f7f2b10a | 353 | * buf - Pointer to characters to be moved. |
0b99d589 | 354 | * n - Number of characters to move. |
8e8d27f7 | 355 | */ |
0b99d589 LL |
356 | static void dgnc_wmove(struct channel_t *ch, char *buf, uint n) |
357 | { | |
358 | int remain; | |
359 | uint head; | |
360 | ||
361 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
362 | return; | |
8b07d521 | 363 | |
0b99d589 LL |
364 | head = ch->ch_w_head & WQUEUEMASK; |
365 | ||
366 | /* | |
367 | * If the write wraps over the top of the circular buffer, | |
368 | * move the portion up to the wrap point, and reset the | |
369 | * pointers to the bottom. | |
370 | */ | |
371 | remain = WQUEUESIZE - head; | |
372 | ||
373 | if (n >= remain) { | |
8b07d521 | 374 | n -= remain; |
0b99d589 LL |
375 | memcpy(ch->ch_wqueue + head, buf, remain); |
376 | head = 0; | |
377 | buf += remain; | |
378 | } | |
379 | ||
380 | if (n > 0) { | |
7127fa28 | 381 | /* Move rest of data. */ |
0b99d589 LL |
382 | remain = n; |
383 | memcpy(ch->ch_wqueue + head, buf, remain); | |
384 | head += remain; | |
385 | } | |
386 | ||
387 | head &= WQUEUEMASK; | |
388 | ch->ch_w_head = head; | |
389 | } | |
390 | ||
8e8d27f7 | 391 | /* |
0b99d589 | 392 | * dgnc_input - Process received data. |
8b07d521 | 393 | * |
90d2a471 | 394 | * ch - Pointer to channel structure. |
8e8d27f7 | 395 | */ |
0b99d589 LL |
396 | void dgnc_input(struct channel_t *ch) |
397 | { | |
03425f55 | 398 | struct dgnc_board *bd; |
0b99d589 | 399 | struct tty_struct *tp; |
c84a083b | 400 | struct tty_ldisc *ld = NULL; |
0b99d589 LL |
401 | uint rmask; |
402 | ushort head; | |
403 | ushort tail; | |
404 | int data_len; | |
a44b508a | 405 | unsigned long flags; |
0b99d589 LL |
406 | int flip_len; |
407 | int len = 0; | |
408 | int n = 0; | |
0b99d589 LL |
409 | int s = 0; |
410 | int i = 0; | |
411 | ||
412 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
413 | return; | |
414 | ||
415 | tp = ch->ch_tun.un_tty; | |
416 | ||
417 | bd = ch->ch_bd; | |
a82477c3 | 418 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
0b99d589 LL |
419 | return; |
420 | ||
a44b508a | 421 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 422 | |
8b07d521 LL |
423 | /* |
424 | * Figure the number of characters in the buffer. | |
0b99d589 LL |
425 | * Exit immediately if none. |
426 | */ | |
427 | rmask = RQUEUEMASK; | |
428 | head = ch->ch_r_head & rmask; | |
429 | tail = ch->ch_r_tail & rmask; | |
430 | data_len = (head - tail) & rmask; | |
431 | ||
c84a083b QL |
432 | if (data_len == 0) |
433 | goto exit_unlock; | |
0b99d589 | 434 | |
0b99d589 LL |
435 | /* |
436 | * If the device is not open, or CREAD is off, | |
90d2a471 | 437 | * flush input data and return immediately. |
0b99d589 | 438 | */ |
851f306d CM |
439 | if (!tp || (tp->magic != TTY_MAGIC) || |
440 | !(ch->ch_tun.un_flags & UN_ISOPEN) || | |
9db276f8 | 441 | !C_CREAD(tp) || |
851f306d | 442 | (ch->ch_tun.un_flags & UN_CLOSING)) { |
0b99d589 LL |
443 | ch->ch_r_head = tail; |
444 | ||
445 | /* Force queue flow control to be released, if needed */ | |
446 | dgnc_check_queue_flow_control(ch); | |
447 | ||
c84a083b | 448 | goto exit_unlock; |
0b99d589 LL |
449 | } |
450 | ||
7127fa28 WF |
451 | /* If we are throttled, simply don't read any data. */ |
452 | ||
c84a083b QL |
453 | if (ch->ch_flags & CH_FORCED_STOPI) |
454 | goto exit_unlock; | |
0b99d589 | 455 | |
100013fa | 456 | flip_len = TTY_FLIPBUF_SIZE; |
0b99d589 LL |
457 | |
458 | /* Chop down the length, if needed */ | |
459 | len = min(data_len, flip_len); | |
100013fa | 460 | len = min(len, (N_TTY_BUF_SIZE - 1)); |
0b99d589 LL |
461 | |
462 | ld = tty_ldisc_ref(tp); | |
463 | ||
0b99d589 LL |
464 | /* |
465 | * If we were unable to get a reference to the ld, | |
466 | * don't flush our buffer, and act like the ld doesn't | |
467 | * have any space to put the data right now. | |
468 | */ | |
469 | if (!ld) { | |
470 | len = 0; | |
471 | } else { | |
472 | /* | |
473 | * If ld doesn't have a pointer to a receive_buf function, | |
474 | * flush the data, then act like the ld doesn't have any | |
475 | * space to put the data right now. | |
476 | */ | |
477 | if (!ld->ops->receive_buf) { | |
478 | ch->ch_r_head = ch->ch_r_tail; | |
479 | len = 0; | |
8b07d521 | 480 | } |
0b99d589 LL |
481 | } |
482 | ||
c84a083b QL |
483 | if (len <= 0) |
484 | goto exit_unlock; | |
0b99d589 LL |
485 | |
486 | /* | |
487 | * The tty layer in the kernel has changed in 2.6.16+. | |
488 | * | |
489 | * The flip buffers in the tty structure are no longer exposed, | |
490 | * and probably will be going away eventually. | |
8b07d521 | 491 | * |
0b99d589 LL |
492 | * If we are completely raw, we don't need to go through a lot |
493 | * of the tty layers that exist. | |
494 | * In this case, we take the shortest and fastest route we | |
495 | * can to relay the data to the user. | |
496 | * | |
497 | * On the other hand, if we are not raw, we need to go through | |
498 | * the new 2.6.16+ tty layer, which has its API more well defined. | |
499 | */ | |
100013fa LL |
500 | len = tty_buffer_request_room(tp->port, len); |
501 | n = len; | |
0b99d589 | 502 | |
100013fa LL |
503 | /* |
504 | * n now contains the most amount of data we can copy, | |
505 | * bounded either by how much the Linux tty layer can handle, | |
506 | * or the amount of data the card actually has pending... | |
507 | */ | |
508 | while (n) { | |
56d118c2 DY |
509 | unsigned char *ch_pos = ch->ch_equeue + tail; |
510 | ||
100013fa LL |
511 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; |
512 | s = min(s, n); | |
0b99d589 | 513 | |
100013fa LL |
514 | if (s <= 0) |
515 | break; | |
0b99d589 LL |
516 | |
517 | /* | |
8b07d521 | 518 | * If conditions are such that ld needs to see all |
100013fa LL |
519 | * UART errors, we will have to walk each character |
520 | * and error byte and send them to the buffer one at | |
521 | * a time. | |
0b99d589 | 522 | */ |
100013fa LL |
523 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
524 | for (i = 0; i < s; i++) { | |
56d118c2 DY |
525 | unsigned char ch = *(ch_pos + i); |
526 | char flag = TTY_NORMAL; | |
527 | ||
528 | if (ch & UART_LSR_BI) | |
529 | flag = TTY_BREAK; | |
530 | else if (ch & UART_LSR_PE) | |
531 | flag = TTY_PARITY; | |
532 | else if (ch & UART_LSR_FE) | |
533 | flag = TTY_FRAME; | |
534 | ||
535 | tty_insert_flip_char(tp->port, ch, flag); | |
100013fa | 536 | } |
2000c581 | 537 | } else { |
56d118c2 | 538 | tty_insert_flip_string(tp->port, ch_pos, s); |
0b99d589 LL |
539 | } |
540 | ||
100013fa LL |
541 | tail += s; |
542 | n -= s; | |
543 | /* Flip queue if needed */ | |
544 | tail &= rmask; | |
0b99d589 | 545 | } |
0b99d589 | 546 | |
100013fa LL |
547 | ch->ch_r_tail = tail & rmask; |
548 | ch->ch_e_tail = tail & rmask; | |
549 | dgnc_check_queue_flow_control(ch); | |
a44b508a | 550 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 551 | |
100013fa LL |
552 | /* Tell the tty layer its okay to "eat" the data now */ |
553 | tty_flip_buffer_push(tp->port); | |
0b99d589 LL |
554 | |
555 | if (ld) | |
556 | tty_ldisc_deref(ld); | |
c84a083b QL |
557 | return; |
558 | ||
559 | exit_unlock: | |
5ec29365 | 560 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
c84a083b QL |
561 | if (ld) |
562 | tty_ldisc_deref(ld); | |
0b99d589 LL |
563 | } |
564 | ||
7127fa28 | 565 | /* |
0b99d589 | 566 | * Determines when CARRIER changes state and takes appropriate |
8b07d521 | 567 | * action. |
7127fa28 | 568 | */ |
0b99d589 LL |
569 | void dgnc_carrier(struct channel_t *ch) |
570 | { | |
90d2a471 LL |
571 | int virt_carrier = 0; |
572 | int phys_carrier = 0; | |
8b07d521 | 573 | |
0b99d589 LL |
574 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
575 | return; | |
576 | ||
f1e51745 | 577 | if (ch->ch_mistat & UART_MSR_DCD) |
0b99d589 | 578 | phys_carrier = 1; |
0b99d589 | 579 | |
50667c67 | 580 | if (ch->ch_digi.digi_flags & DIGI_FORCEDCD) |
0b99d589 | 581 | virt_carrier = 1; |
0b99d589 | 582 | |
50667c67 | 583 | if (ch->ch_c_cflag & CLOCAL) |
0b99d589 | 584 | virt_carrier = 1; |
0b99d589 | 585 | |
7127fa28 WF |
586 | /* Test for a VIRTUAL carrier transition to HIGH. */ |
587 | ||
0b99d589 | 588 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { |
0b99d589 LL |
589 | /* |
590 | * When carrier rises, wake any threads waiting | |
591 | * for carrier in the open routine. | |
592 | */ | |
7df227c4 | 593 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
594 | wake_up_interruptible(&ch->ch_flags_wait); |
595 | } | |
596 | ||
7127fa28 WF |
597 | /* Test for a PHYSICAL carrier transition to HIGH. */ |
598 | ||
0b99d589 | 599 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { |
0b99d589 LL |
600 | /* |
601 | * When carrier rises, wake any threads waiting | |
602 | * for carrier in the open routine. | |
603 | */ | |
7df227c4 | 604 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
605 | wake_up_interruptible(&ch->ch_flags_wait); |
606 | } | |
607 | ||
608 | /* | |
609 | * Test for a PHYSICAL transition to low, so long as we aren't | |
610 | * currently ignoring physical transitions (which is what "virtual | |
611 | * carrier" indicates). | |
612 | * | |
613 | * The transition of the virtual carrier to low really doesn't | |
614 | * matter... it really only means "ignore carrier state", not | |
615 | * "make pretend that carrier is there". | |
616 | */ | |
617 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) && | |
10352c2a | 618 | (phys_carrier == 0)) { |
0b99d589 LL |
619 | /* |
620 | * When carrier drops: | |
621 | * | |
622 | * Drop carrier on all open units. | |
623 | * | |
624 | * Flush queues, waking up any task waiting in the | |
625 | * line discipline. | |
626 | * | |
627 | * Send a hangup to the control terminal. | |
628 | * | |
629 | * Enable all select calls. | |
630 | */ | |
7df227c4 | 631 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
632 | wake_up_interruptible(&ch->ch_flags_wait); |
633 | ||
f1e51745 | 634 | if (ch->ch_tun.un_open_count > 0) |
0b99d589 | 635 | tty_hangup(ch->ch_tun.un_tty); |
0b99d589 | 636 | |
f1e51745 | 637 | if (ch->ch_pun.un_open_count > 0) |
0b99d589 | 638 | tty_hangup(ch->ch_pun.un_tty); |
0b99d589 LL |
639 | } |
640 | ||
7127fa28 WF |
641 | /* Make sure that our cached values reflect the current reality. */ |
642 | ||
0b99d589 LL |
643 | if (virt_carrier == 1) |
644 | ch->ch_flags |= CH_FCAR; | |
8b07d521 | 645 | else |
0b99d589 LL |
646 | ch->ch_flags &= ~CH_FCAR; |
647 | ||
648 | if (phys_carrier == 1) | |
649 | ch->ch_flags |= CH_CD; | |
650 | else | |
651 | ch->ch_flags &= ~CH_CD; | |
652 | } | |
653 | ||
7127fa28 WF |
654 | /* Assign the custom baud rate to the channel structure */ |
655 | ||
0b99d589 LL |
656 | static void dgnc_set_custom_speed(struct channel_t *ch, uint newrate) |
657 | { | |
658 | int testdiv; | |
659 | int testrate_high; | |
8b07d521 | 660 | int testrate_low; |
0b99d589 LL |
661 | int deltahigh; |
662 | int deltalow; | |
663 | ||
93c76c9c DY |
664 | if (newrate <= 0) { |
665 | ch->ch_custom_speed = 0; | |
666 | return; | |
667 | } | |
0b99d589 LL |
668 | |
669 | /* | |
670 | * Since the divisor is stored in a 16-bit integer, we make sure | |
671 | * we don't allow any rates smaller than a 16-bit integer would allow. | |
672 | * And of course, rates above the dividend won't fly. | |
673 | */ | |
674 | if (newrate && newrate < ((ch->ch_bd->bd_dividend / 0xFFFF) + 1)) | |
0b7ceaa6 | 675 | newrate = (ch->ch_bd->bd_dividend / 0xFFFF) + 1; |
0b99d589 LL |
676 | |
677 | if (newrate && newrate > ch->ch_bd->bd_dividend) | |
90d2a471 | 678 | newrate = ch->ch_bd->bd_dividend; |
0b99d589 | 679 | |
93c76c9c | 680 | if (newrate > 0) { |
0b99d589 LL |
681 | testdiv = ch->ch_bd->bd_dividend / newrate; |
682 | ||
683 | /* | |
684 | * If we try to figure out what rate the board would use | |
685 | * with the test divisor, it will be either equal or higher | |
686 | * than the requested baud rate. If we then determine the | |
8b07d521 | 687 | * rate with a divisor one higher, we will get the next lower |
0b99d589 LL |
688 | * supported rate below the requested. |
689 | */ | |
690 | testrate_high = ch->ch_bd->bd_dividend / testdiv; | |
691 | testrate_low = ch->ch_bd->bd_dividend / (testdiv + 1); | |
692 | ||
693 | /* | |
694 | * If the rate for the requested divisor is correct, just | |
695 | * use it and be done. | |
696 | */ | |
93c76c9c DY |
697 | if (testrate_high != newrate) { |
698 | /* | |
851f306d CM |
699 | * Otherwise, pick the rate that is closer |
700 | * (i.e. whichever rate has a smaller delta). | |
93c76c9c DY |
701 | */ |
702 | deltahigh = testrate_high - newrate; | |
703 | deltalow = newrate - testrate_low; | |
0b99d589 | 704 | |
50667c67 | 705 | if (deltahigh < deltalow) |
93c76c9c | 706 | newrate = testrate_high; |
50667c67 | 707 | else |
93c76c9c | 708 | newrate = testrate_low; |
0b99d589 | 709 | } |
0b99d589 | 710 | } |
8b07d521 | 711 | |
0b99d589 | 712 | ch->ch_custom_speed = newrate; |
0b99d589 LL |
713 | } |
714 | ||
0b99d589 LL |
715 | void dgnc_check_queue_flow_control(struct channel_t *ch) |
716 | { | |
d09c1b96 | 717 | int qleft; |
0b99d589 LL |
718 | |
719 | /* Store how much space we have left in the queue */ | |
f7c851d4 CP |
720 | qleft = ch->ch_r_tail - ch->ch_r_head - 1; |
721 | if (qleft < 0) | |
0b99d589 LL |
722 | qleft += RQUEUEMASK + 1; |
723 | ||
724 | /* | |
725 | * Check to see if we should enforce flow control on our queue because | |
726 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
727 | * | |
728 | * NOTE: This is done based on what the current flow control of the | |
729 | * port is set for. | |
730 | * | |
731 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
732 | * This will cause the UART's FIFO to back up, and force | |
733 | * the RTS signal to be dropped. | |
734 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
735 | * the other side, in hopes it will stop sending data to us. | |
736 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
737 | * that gets sent into us when the queue fills up. | |
738 | */ | |
739 | if (qleft < 256) { | |
740 | /* HWFLOW */ | |
851f306d CM |
741 | if (ch->ch_digi.digi_flags & CTSPACE || |
742 | ch->ch_c_cflag & CRTSCTS) { | |
a82477c3 | 743 | if (!(ch->ch_flags & CH_RECEIVER_OFF)) { |
0b99d589 LL |
744 | ch->ch_bd->bd_ops->disable_receiver(ch); |
745 | ch->ch_flags |= (CH_RECEIVER_OFF); | |
0b99d589 LL |
746 | } |
747 | } | |
748 | /* SWFLOW */ | |
749 | else if (ch->ch_c_iflag & IXOFF) { | |
750 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
751 | ch->ch_bd->bd_ops->send_stop_character(ch); | |
752 | ch->ch_stops_sent++; | |
0b99d589 LL |
753 | } |
754 | } | |
0b99d589 LL |
755 | } |
756 | ||
757 | /* | |
758 | * Check to see if we should unenforce flow control because | |
759 | * ld (or user) finally read enuf data out of our queue. | |
760 | * | |
761 | * NOTE: This is done based on what the current flow control of the | |
762 | * port is set for. | |
763 | * | |
764 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
765 | * This will cause the UART's FIFO to raise RTS back up, | |
766 | * which will allow the other side to start sending data again. | |
767 | * 2) SWFLOW (IXOFF) - Send a start character to | |
768 | * the other side, so it will start sending data to us again. | |
769 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
770 | * other side, we don't need to do anything now. | |
771 | */ | |
772 | if (qleft > (RQUEUESIZE / 2)) { | |
773 | /* HWFLOW */ | |
851f306d CM |
774 | if (ch->ch_digi.digi_flags & RTSPACE || |
775 | ch->ch_c_cflag & CRTSCTS) { | |
0b99d589 LL |
776 | if (ch->ch_flags & CH_RECEIVER_OFF) { |
777 | ch->ch_bd->bd_ops->enable_receiver(ch); | |
778 | ch->ch_flags &= ~(CH_RECEIVER_OFF); | |
0b99d589 LL |
779 | } |
780 | } | |
781 | /* SWFLOW */ | |
782 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
783 | ch->ch_stops_sent = 0; | |
784 | ch->ch_bd->bd_ops->send_start_character(ch); | |
0b99d589 | 785 | } |
0b99d589 LL |
786 | } |
787 | } | |
788 | ||
9b33f918 FA |
789 | static void dgnc_set_signal_low(struct channel_t *ch, const unsigned char sig) |
790 | { | |
791 | ch->ch_mostat &= ~(sig); | |
792 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
793 | } | |
794 | ||
0b99d589 LL |
795 | void dgnc_wakeup_writes(struct channel_t *ch) |
796 | { | |
797 | int qlen = 0; | |
a44b508a | 798 | unsigned long flags; |
0b99d589 LL |
799 | |
800 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
801 | return; | |
802 | ||
a44b508a | 803 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 804 | |
7127fa28 WF |
805 | /* If channel now has space, wake up anyone waiting on the condition. */ |
806 | ||
f7c851d4 CP |
807 | qlen = ch->ch_w_head - ch->ch_w_tail; |
808 | if (qlen < 0) | |
90d2a471 | 809 | qlen += WQUEUESIZE; |
0b99d589 LL |
810 | |
811 | if (qlen >= (WQUEUESIZE - 256)) { | |
a44b508a | 812 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
813 | return; |
814 | } | |
815 | ||
816 | if (ch->ch_tun.un_flags & UN_ISOPEN) { | |
6aa56785 | 817 | tty_wakeup(ch->ch_tun.un_tty); |
0b99d589 LL |
818 | |
819 | /* | |
820 | * If unit is set to wait until empty, check to make sure | |
821 | * the queue AND FIFO are both empty. | |
822 | */ | |
823 | if (ch->ch_tun.un_flags & UN_EMPTY) { | |
851f306d | 824 | if ((qlen == 0) && |
e352d3f1 | 825 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) { |
0b99d589 LL |
826 | ch->ch_tun.un_flags &= ~(UN_EMPTY); |
827 | ||
828 | /* | |
829 | * If RTS Toggle mode is on, whenever | |
830 | * the queue and UART is empty, keep RTS low. | |
831 | */ | |
9b33f918 FA |
832 | if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) |
833 | dgnc_set_signal_low(ch, UART_MCR_RTS); | |
0b99d589 LL |
834 | |
835 | /* | |
836 | * If DTR Toggle mode is on, whenever | |
837 | * the queue and UART is empty, keep DTR low. | |
838 | */ | |
9b33f918 FA |
839 | if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) |
840 | dgnc_set_signal_low(ch, UART_MCR_DTR); | |
0b99d589 LL |
841 | } |
842 | } | |
843 | ||
844 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); | |
845 | } | |
846 | ||
847 | if (ch->ch_pun.un_flags & UN_ISOPEN) { | |
6aa56785 | 848 | tty_wakeup(ch->ch_pun.un_tty); |
0b99d589 LL |
849 | |
850 | /* | |
851 | * If unit is set to wait until empty, check to make sure | |
852 | * the queue AND FIFO are both empty. | |
853 | */ | |
854 | if (ch->ch_pun.un_flags & UN_EMPTY) { | |
851f306d CM |
855 | if ((qlen == 0) && |
856 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) | |
0b99d589 | 857 | ch->ch_pun.un_flags &= ~(UN_EMPTY); |
0b99d589 LL |
858 | } |
859 | ||
860 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); | |
861 | } | |
862 | ||
a44b508a | 863 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
864 | } |
865 | ||
2e41eb96 | 866 | static struct dgnc_board *find_board_by_major(unsigned int major) |
9f7a104c DY |
867 | { |
868 | int i; | |
869 | ||
870 | for (i = 0; i < MAXBOARDS; i++) { | |
871 | struct dgnc_board *brd = dgnc_board[i]; | |
872 | ||
873 | if (!brd) | |
874 | return NULL; | |
875 | ||
876 | if (major == brd->serial_driver->major || | |
877 | major == brd->print_driver->major) | |
878 | return brd; | |
879 | } | |
880 | ||
881 | return NULL; | |
882 | } | |
883 | ||
7127fa28 WF |
884 | /* TTY Entry points and helper functions */ |
885 | ||
886 | /* dgnc_tty_open() */ | |
0b99d589 | 887 | |
0b99d589 LL |
888 | static int dgnc_tty_open(struct tty_struct *tty, struct file *file) |
889 | { | |
03425f55 | 890 | struct dgnc_board *brd; |
0b99d589 LL |
891 | struct channel_t *ch; |
892 | struct un_t *un; | |
893 | uint major = 0; | |
894 | uint minor = 0; | |
895 | int rc = 0; | |
a44b508a | 896 | unsigned long flags; |
0b99d589 LL |
897 | |
898 | rc = 0; | |
899 | ||
900 | major = MAJOR(tty_devnum(tty)); | |
901 | minor = MINOR(tty_devnum(tty)); | |
902 | ||
50667c67 | 903 | if (major > 255) |
0b99d589 | 904 | return -ENXIO; |
0b99d589 LL |
905 | |
906 | /* Get board pointer from our array of majors we have allocated */ | |
9f7a104c | 907 | brd = find_board_by_major(major); |
50667c67 | 908 | if (!brd) |
0b99d589 | 909 | return -ENXIO; |
0b99d589 LL |
910 | |
911 | /* | |
912 | * If board is not yet up to a state of READY, go to | |
913 | * sleep waiting for it to happen or they cancel the open. | |
914 | */ | |
915 | rc = wait_event_interruptible(brd->state_wait, | |
e352d3f1 | 916 | (brd->state & BOARD_READY)); |
0b99d589 | 917 | |
50667c67 | 918 | if (rc) |
0b99d589 | 919 | return rc; |
0b99d589 | 920 | |
a44b508a | 921 | spin_lock_irqsave(&brd->bd_lock, flags); |
0b99d589 LL |
922 | |
923 | /* If opened device is greater than our number of ports, bail. */ | |
4bef52f3 | 924 | if (PORT_NUM(minor) >= brd->nasync) { |
a44b508a | 925 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
926 | return -ENXIO; |
927 | } | |
928 | ||
929 | ch = brd->channels[PORT_NUM(minor)]; | |
930 | if (!ch) { | |
a44b508a | 931 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
932 | return -ENXIO; |
933 | } | |
934 | ||
935 | /* Drop board lock */ | |
a44b508a | 936 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
937 | |
938 | /* Grab channel lock */ | |
a44b508a | 939 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
940 | |
941 | /* Figure out our type */ | |
942 | if (!IS_PRINT(minor)) { | |
943 | un = &brd->channels[PORT_NUM(minor)]->ch_tun; | |
944 | un->un_type = DGNC_SERIAL; | |
2000c581 | 945 | } else if (IS_PRINT(minor)) { |
0b99d589 LL |
946 | un = &brd->channels[PORT_NUM(minor)]->ch_pun; |
947 | un->un_type = DGNC_PRINT; | |
2000c581 | 948 | } else { |
a44b508a | 949 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
950 | return -ENXIO; |
951 | } | |
952 | ||
953 | /* | |
954 | * If the port is still in a previous open, and in a state | |
955 | * where we simply cannot safely keep going, wait until the | |
956 | * state clears. | |
957 | */ | |
a44b508a | 958 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 959 | |
851f306d CM |
960 | rc = wait_event_interruptible(ch->ch_flags_wait, |
961 | ((ch->ch_flags & CH_OPENING) == 0)); | |
0b99d589 LL |
962 | |
963 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 964 | if (rc) |
0b99d589 | 965 | return -EINTR; |
0b99d589 LL |
966 | |
967 | /* | |
968 | * If either unit is in the middle of the fragile part of close, | |
969 | * we just cannot touch the channel safely. | |
970 | * Go to sleep, knowing that when the channel can be | |
971 | * touched safely, the close routine will signal the | |
972 | * ch_flags_wait to wake us back up. | |
973 | */ | |
b3fc909a NH |
974 | rc = wait_event_interruptible( |
975 | ch->ch_flags_wait, | |
976 | (((ch->ch_tun.un_flags | | |
977 | ch->ch_pun.un_flags) & UN_CLOSING) == 0)); | |
0b99d589 LL |
978 | |
979 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 980 | if (rc) |
0b99d589 | 981 | return -EINTR; |
0b99d589 | 982 | |
a44b508a | 983 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 984 | |
0b99d589 LL |
985 | /* Store our unit into driver_data, so we always have it available. */ |
986 | tty->driver_data = un; | |
987 | ||
7127fa28 WF |
988 | /* Initialize tty's */ |
989 | ||
0b99d589 LL |
990 | if (!(un->un_flags & UN_ISOPEN)) { |
991 | /* Store important variables. */ | |
992 | un->un_tty = tty; | |
993 | ||
994 | /* Maybe do something here to the TTY struct as well? */ | |
995 | } | |
996 | ||
0b99d589 LL |
997 | /* |
998 | * Allocate channel buffers for read/write/error. | |
999 | * Set flag, so we don't get trounced on. | |
1000 | */ | |
1001 | ch->ch_flags |= (CH_OPENING); | |
1002 | ||
1003 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
a44b508a | 1004 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1005 | |
1006 | if (!ch->ch_rqueue) | |
52f9d668 | 1007 | ch->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1008 | if (!ch->ch_equeue) |
52f9d668 | 1009 | ch->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1010 | if (!ch->ch_wqueue) |
52f9d668 | 1011 | ch->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1012 | |
16f10a82 DY |
1013 | if (!ch->ch_rqueue || !ch->ch_equeue || !ch->ch_wqueue) { |
1014 | kfree(ch->ch_rqueue); | |
1015 | kfree(ch->ch_equeue); | |
1016 | kfree(ch->ch_wqueue); | |
1017 | ||
1018 | return -ENOMEM; | |
1019 | } | |
1020 | ||
a44b508a | 1021 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1022 | |
1023 | ch->ch_flags &= ~(CH_OPENING); | |
1024 | wake_up_interruptible(&ch->ch_flags_wait); | |
1025 | ||
7127fa28 WF |
1026 | /* Initialize if neither terminal or printer is open. */ |
1027 | ||
0b99d589 | 1028 | if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_ISOPEN)) { |
7127fa28 | 1029 | /* Flush input queues. */ |
587abd7b SL |
1030 | ch->ch_r_head = 0; |
1031 | ch->ch_r_tail = 0; | |
1032 | ch->ch_e_head = 0; | |
1033 | ch->ch_e_tail = 0; | |
1034 | ch->ch_w_head = 0; | |
1035 | ch->ch_w_tail = 0; | |
0b99d589 LL |
1036 | |
1037 | brd->bd_ops->flush_uart_write(ch); | |
1038 | brd->bd_ops->flush_uart_read(ch); | |
1039 | ||
1040 | ch->ch_flags = 0; | |
1041 | ch->ch_cached_lsr = 0; | |
1042 | ch->ch_stop_sending_break = 0; | |
1043 | ch->ch_stops_sent = 0; | |
1044 | ||
22e3de76 LL |
1045 | ch->ch_c_cflag = tty->termios.c_cflag; |
1046 | ch->ch_c_iflag = tty->termios.c_iflag; | |
1047 | ch->ch_c_oflag = tty->termios.c_oflag; | |
1048 | ch->ch_c_lflag = tty->termios.c_lflag; | |
1049 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
1050 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
1051 | |
1052 | /* | |
1053 | * Bring up RTS and DTR... | |
1054 | * Also handle RTS or DTR toggle if set. | |
1055 | */ | |
1056 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
1057 | ch->ch_mostat |= (UART_MCR_RTS); | |
1058 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
1059 | ch->ch_mostat |= (UART_MCR_DTR); | |
1060 | ||
1061 | /* Tell UART to init itself */ | |
1062 | brd->bd_ops->uart_init(ch); | |
1063 | } | |
1064 | ||
7127fa28 WF |
1065 | /* Run param in case we changed anything */ |
1066 | ||
0b99d589 LL |
1067 | brd->bd_ops->param(tty); |
1068 | ||
1069 | dgnc_carrier(ch); | |
1070 | ||
7127fa28 | 1071 | /* follow protocol for opening port */ |
0b99d589 | 1072 | |
a44b508a | 1073 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1074 | |
1075 | rc = dgnc_block_til_ready(tty, file, ch); | |
1076 | ||
0b99d589 | 1077 | /* No going back now, increment our unit and channel counters */ |
a44b508a | 1078 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1079 | ch->ch_open_count++; |
1080 | un->un_open_count++; | |
1081 | un->un_flags |= (UN_ISOPEN); | |
a44b508a | 1082 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1083 | |
8f90ef80 | 1084 | return rc; |
0b99d589 LL |
1085 | } |
1086 | ||
8b07d521 | 1087 | /* |
0b99d589 LL |
1088 | * dgnc_block_til_ready() |
1089 | * | |
1090 | * Wait for DCD, if needed. | |
1091 | */ | |
851f306d CM |
1092 | static int dgnc_block_til_ready(struct tty_struct *tty, |
1093 | struct file *file, | |
1094 | struct channel_t *ch) | |
8b07d521 | 1095 | { |
0b99d589 | 1096 | int retval = 0; |
10334418 | 1097 | struct un_t *un = tty->driver_data; |
a44b508a | 1098 | unsigned long flags; |
0b99d589 LL |
1099 | uint old_flags = 0; |
1100 | int sleep_on_un_flags = 0; | |
1101 | ||
10334418 | 1102 | if (!file) |
8f90ef80 | 1103 | return -ENXIO; |
0b99d589 | 1104 | |
a44b508a | 1105 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1106 | |
1107 | ch->ch_wopen++; | |
1108 | ||
1109 | /* Loop forever */ | |
1110 | while (1) { | |
0b99d589 LL |
1111 | sleep_on_un_flags = 0; |
1112 | ||
1113 | /* | |
851f306d CM |
1114 | * If board has failed somehow during our sleep, |
1115 | * bail with error. | |
0b99d589 LL |
1116 | */ |
1117 | if (ch->ch_bd->state == BOARD_FAILED) { | |
1118 | retval = -ENXIO; | |
1119 | break; | |
1120 | } | |
1121 | ||
1122 | /* If tty was hung up, break out of loop and set error. */ | |
1123 | if (tty_hung_up_p(file)) { | |
1124 | retval = -EAGAIN; | |
1125 | break; | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * If either unit is in the middle of the fragile part of close, | |
1130 | * we just cannot touch the channel safely. | |
1131 | * Go back to sleep, knowing that when the channel can be | |
8b07d521 | 1132 | * touched safely, the close routine will signal the |
0b99d589 LL |
1133 | * ch_wait_flags to wake us back up. |
1134 | */ | |
851f306d CM |
1135 | if (!((ch->ch_tun.un_flags | |
1136 | ch->ch_pun.un_flags) & | |
1137 | UN_CLOSING)) { | |
0b99d589 LL |
1138 | /* |
1139 | * Our conditions to leave cleanly and happily: | |
1140 | * 1) NONBLOCKING on the tty is set. | |
1141 | * 2) CLOCAL is set. | |
1142 | * 3) DCD (fake or real) is active. | |
1143 | */ | |
1144 | ||
50667c67 | 1145 | if (file->f_flags & O_NONBLOCK) |
0b99d589 | 1146 | break; |
0b99d589 | 1147 | |
18900ca6 | 1148 | if (tty_io_error(tty)) { |
0b99d589 LL |
1149 | retval = -EIO; |
1150 | break; | |
1151 | } | |
1152 | ||
f1e51745 | 1153 | if (ch->ch_flags & CH_CD) |
0b99d589 | 1154 | break; |
0b99d589 | 1155 | |
f1e51745 | 1156 | if (ch->ch_flags & CH_FCAR) |
0b99d589 | 1157 | break; |
2000c581 | 1158 | } else { |
0b99d589 LL |
1159 | sleep_on_un_flags = 1; |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | * If there is a signal pending, the user probably | |
1164 | * interrupted (ctrl-c) us. | |
1165 | * Leave loop with error set. | |
1166 | */ | |
1167 | if (signal_pending(current)) { | |
0b99d589 LL |
1168 | retval = -ERESTARTSYS; |
1169 | break; | |
1170 | } | |
1171 | ||
7127fa28 WF |
1172 | /* Store the flags before we let go of channel lock */ |
1173 | ||
0b99d589 LL |
1174 | if (sleep_on_un_flags) |
1175 | old_flags = ch->ch_tun.un_flags | ch->ch_pun.un_flags; | |
1176 | else | |
1177 | old_flags = ch->ch_flags; | |
1178 | ||
1179 | /* | |
1180 | * Let go of channel lock before calling schedule. | |
1181 | * Our poller will get any FEP events and wake us up when DCD | |
1182 | * eventually goes active. | |
1183 | */ | |
1184 | ||
a44b508a | 1185 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1186 | |
0b99d589 | 1187 | /* |
851f306d CM |
1188 | * Wait for something in the flags to change |
1189 | * from the current value. | |
0b99d589 | 1190 | */ |
50667c67 | 1191 | if (sleep_on_un_flags) |
7bd43874 | 1192 | retval = wait_event_interruptible |
9b33f918 FA |
1193 | (un->un_flags_wait, |
1194 | (old_flags != (ch->ch_tun.un_flags | | |
1195 | ch->ch_pun.un_flags))); | |
50667c67 | 1196 | else |
b3fc909a NH |
1197 | retval = wait_event_interruptible( |
1198 | ch->ch_flags_wait, | |
9b33f918 | 1199 | (old_flags != ch->ch_flags)); |
0b99d589 | 1200 | |
0b99d589 LL |
1201 | /* |
1202 | * We got woken up for some reason. | |
1203 | * Before looping around, grab our channel lock. | |
1204 | */ | |
a44b508a | 1205 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1206 | } |
1207 | ||
1208 | ch->ch_wopen--; | |
1209 | ||
a44b508a | 1210 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1211 | |
36e712a8 | 1212 | return retval; |
0b99d589 LL |
1213 | } |
1214 | ||
0b99d589 LL |
1215 | /* |
1216 | * dgnc_tty_hangup() | |
1217 | * | |
1218 | * Hangup the port. Like a close, but don't wait for output to drain. | |
8b07d521 | 1219 | */ |
0b99d589 LL |
1220 | static void dgnc_tty_hangup(struct tty_struct *tty) |
1221 | { | |
0b99d589 LL |
1222 | if (!tty || tty->magic != TTY_MAGIC) |
1223 | return; | |
1224 | ||
0b99d589 LL |
1225 | /* flush the transmit queues */ |
1226 | dgnc_tty_flush_buffer(tty); | |
0b99d589 LL |
1227 | } |
1228 | ||
7127fa28 WF |
1229 | /* dgnc_tty_close() */ |
1230 | ||
0b99d589 LL |
1231 | static void dgnc_tty_close(struct tty_struct *tty, struct file *file) |
1232 | { | |
03425f55 | 1233 | struct dgnc_board *bd; |
0b99d589 LL |
1234 | struct channel_t *ch; |
1235 | struct un_t *un; | |
a44b508a | 1236 | unsigned long flags; |
0b99d589 LL |
1237 | |
1238 | if (!tty || tty->magic != TTY_MAGIC) | |
1239 | return; | |
1240 | ||
1241 | un = tty->driver_data; | |
1242 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1243 | return; | |
1244 | ||
1245 | ch = un->un_ch; | |
1246 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1247 | return; | |
1248 | ||
1249 | bd = ch->ch_bd; | |
1250 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1251 | return; | |
1252 | ||
a44b508a | 1253 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1254 | |
1255 | /* | |
1256 | * Determine if this is the last close or not - and if we agree about | |
1257 | * which type of close it is with the Line Discipline | |
1258 | */ | |
1259 | if ((tty->count == 1) && (un->un_open_count != 1)) { | |
1260 | /* | |
1261 | * Uh, oh. tty->count is 1, which means that the tty | |
1262 | * structure will be freed. un_open_count should always | |
1263 | * be one in these conditions. If it's greater than | |
1264 | * one, we've got real problems, since it means the | |
1265 | * serial port won't be shutdown. | |
1266 | */ | |
1f26adc9 RD |
1267 | dev_dbg(tty->dev, |
1268 | "tty->count is 1, un open count is %d\n", | |
1269 | un->un_open_count); | |
0b99d589 | 1270 | un->un_open_count = 1; |
8b07d521 | 1271 | } |
0b99d589 | 1272 | |
3098e514 DY |
1273 | if (un->un_open_count) |
1274 | un->un_open_count--; | |
1275 | else | |
1f26adc9 RD |
1276 | dev_dbg(tty->dev, |
1277 | "bad serial port open count of %d\n", | |
1278 | un->un_open_count); | |
0b99d589 LL |
1279 | |
1280 | ch->ch_open_count--; | |
1281 | ||
1282 | if (ch->ch_open_count && un->un_open_count) { | |
a44b508a | 1283 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
90d2a471 LL |
1284 | return; |
1285 | } | |
0b99d589 LL |
1286 | |
1287 | /* OK, its the last close on the unit */ | |
0b99d589 LL |
1288 | un->un_flags |= UN_CLOSING; |
1289 | ||
1290 | tty->closing = 1; | |
1291 | ||
0b99d589 LL |
1292 | /* |
1293 | * Only officially close channel if count is 0 and | |
90d2a471 | 1294 | * DIGI_PRINTER bit is not set. |
0b99d589 | 1295 | */ |
851f306d CM |
1296 | if ((ch->ch_open_count == 0) && |
1297 | !(ch->ch_digi.digi_flags & DIGI_PRINTER)) { | |
0b99d589 LL |
1298 | ch->ch_flags &= ~(CH_STOPI | CH_FORCED_STOPI); |
1299 | ||
7127fa28 WF |
1300 | /* turn off print device when closing print device. */ |
1301 | ||
9cdf838b | 1302 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1303 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1304 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1305 | ch->ch_flags &= ~CH_PRON; |
1306 | } | |
1307 | ||
a44b508a | 1308 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1309 | /* wait for output to drain */ |
1310 | /* This will also return if we take an interrupt */ | |
1311 | ||
2d9920ec | 1312 | bd->bd_ops->drain(tty, 0); |
0b99d589 | 1313 | |
0b99d589 LL |
1314 | dgnc_tty_flush_buffer(tty); |
1315 | tty_ldisc_flush(tty); | |
1316 | ||
a44b508a | 1317 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1318 | |
1319 | tty->closing = 0; | |
1320 | ||
7127fa28 WF |
1321 | /* If we have HUPCL set, lower DTR and RTS */ |
1322 | ||
0b99d589 | 1323 | if (ch->ch_c_cflag & HUPCL) { |
0b99d589 LL |
1324 | /* Drop RTS/DTR */ |
1325 | ch->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
1326 | bd->bd_ops->assert_modem_signals(ch); | |
1327 | ||
1328 | /* | |
8b07d521 | 1329 | * Go to sleep to ensure RTS/DTR |
0b99d589 LL |
1330 | * have been dropped for modems to see it. |
1331 | */ | |
1332 | if (ch->ch_close_delay) { | |
a44b508a RD |
1333 | spin_unlock_irqrestore(&ch->ch_lock, |
1334 | flags); | |
0b99d589 | 1335 | dgnc_ms_sleep(ch->ch_close_delay); |
a44b508a | 1336 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1337 | } |
1338 | } | |
1339 | ||
1340 | ch->ch_old_baud = 0; | |
1341 | ||
1342 | /* Turn off UART interrupts for this port */ | |
1343 | ch->ch_bd->bd_ops->uart_off(ch); | |
2000c581 | 1344 | } else { |
7127fa28 WF |
1345 | /* turn off print device when closing print device. */ |
1346 | ||
9cdf838b | 1347 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1348 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1349 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1350 | ch->ch_flags &= ~CH_PRON; |
1351 | } | |
1352 | } | |
1353 | ||
1354 | un->un_tty = NULL; | |
1355 | un->un_flags &= ~(UN_ISOPEN | UN_CLOSING); | |
1356 | ||
0b99d589 LL |
1357 | wake_up_interruptible(&ch->ch_flags_wait); |
1358 | wake_up_interruptible(&un->un_flags_wait); | |
1359 | ||
a44b508a | 1360 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1361 | } |
1362 | ||
0b99d589 LL |
1363 | /* |
1364 | * dgnc_tty_chars_in_buffer() | |
1365 | * | |
1366 | * Return number of characters that have not been transmitted yet. | |
1367 | * | |
1368 | * This routine is used by the line discipline to determine if there | |
1369 | * is data waiting to be transmitted/drained/flushed or not. | |
1370 | */ | |
1371 | static int dgnc_tty_chars_in_buffer(struct tty_struct *tty) | |
1372 | { | |
1373 | struct channel_t *ch = NULL; | |
1374 | struct un_t *un = NULL; | |
1375 | ushort thead; | |
1376 | ushort ttail; | |
1377 | uint tmask; | |
1378 | uint chars = 0; | |
a44b508a | 1379 | unsigned long flags; |
0b99d589 | 1380 | |
60acb623 | 1381 | if (!tty) |
8f90ef80 | 1382 | return 0; |
0b99d589 LL |
1383 | |
1384 | un = tty->driver_data; | |
1385 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1386 | return 0; |
0b99d589 LL |
1387 | |
1388 | ch = un->un_ch; | |
1389 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1390 | return 0; |
0b99d589 | 1391 | |
a44b508a | 1392 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1393 | |
1394 | tmask = WQUEUEMASK; | |
1395 | thead = ch->ch_w_head & tmask; | |
1396 | ttail = ch->ch_w_tail & tmask; | |
1397 | ||
a44b508a | 1398 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1399 | |
1400 | if (ttail == thead) { | |
1401 | chars = 0; | |
1402 | } else { | |
1403 | if (thead >= ttail) | |
1404 | chars = thead - ttail; | |
1405 | else | |
1406 | chars = thead - ttail + WQUEUESIZE; | |
1407 | } | |
1408 | ||
8f90ef80 | 1409 | return chars; |
0b99d589 LL |
1410 | } |
1411 | ||
8b07d521 | 1412 | /* |
0b99d589 LL |
1413 | * dgnc_maxcps_room |
1414 | * | |
1415 | * Reduces bytes_available to the max number of characters | |
1416 | * that can be sent currently given the maxcps value, and | |
1417 | * returns the new bytes_available. This only affects printer | |
1418 | * output. | |
8b07d521 | 1419 | */ |
107b40ad | 1420 | static int dgnc_maxcps_room(struct channel_t *ch, int bytes_available) |
0b99d589 | 1421 | { |
9cdf838b | 1422 | if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0) { |
0b99d589 LL |
1423 | int cps_limit = 0; |
1424 | unsigned long current_time = jiffies; | |
1425 | unsigned long buffer_time = current_time + | |
851f306d CM |
1426 | (HZ * ch->ch_digi.digi_bufsize) / |
1427 | ch->ch_digi.digi_maxcps; | |
0b99d589 LL |
1428 | |
1429 | if (ch->ch_cpstime < current_time) { | |
1430 | /* buffer is empty */ | |
851f306d | 1431 | ch->ch_cpstime = current_time; /* reset ch_cpstime */ |
0b99d589 | 1432 | cps_limit = ch->ch_digi.digi_bufsize; |
2000c581 | 1433 | } else if (ch->ch_cpstime < buffer_time) { |
0b99d589 | 1434 | /* still room in the buffer */ |
851f306d CM |
1435 | cps_limit = ((buffer_time - ch->ch_cpstime) * |
1436 | ch->ch_digi.digi_maxcps) / HZ; | |
2000c581 | 1437 | } else { |
0b99d589 | 1438 | /* no room in the buffer */ |
8b07d521 | 1439 | cps_limit = 0; |
0b99d589 LL |
1440 | } |
1441 | ||
1442 | bytes_available = min(cps_limit, bytes_available); | |
1443 | } | |
1444 | ||
8f90ef80 | 1445 | return bytes_available; |
0b99d589 LL |
1446 | } |
1447 | ||
0b99d589 LL |
1448 | /* |
1449 | * dgnc_tty_write_room() | |
1450 | * | |
1451 | * Return space available in Tx buffer | |
8b07d521 | 1452 | */ |
0b99d589 LL |
1453 | static int dgnc_tty_write_room(struct tty_struct *tty) |
1454 | { | |
1455 | struct channel_t *ch = NULL; | |
1456 | struct un_t *un = NULL; | |
1457 | ushort head; | |
1458 | ushort tail; | |
1459 | ushort tmask; | |
1460 | int ret = 0; | |
a44b508a | 1461 | unsigned long flags; |
0b99d589 | 1462 | |
02782a19 | 1463 | if (!tty) |
8f90ef80 | 1464 | return 0; |
0b99d589 LL |
1465 | |
1466 | un = tty->driver_data; | |
1467 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1468 | return 0; |
0b99d589 LL |
1469 | |
1470 | ch = un->un_ch; | |
1471 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1472 | return 0; |
0b99d589 | 1473 | |
a44b508a | 1474 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1475 | |
1476 | tmask = WQUEUEMASK; | |
1477 | head = (ch->ch_w_head) & tmask; | |
1478 | tail = (ch->ch_w_tail) & tmask; | |
1479 | ||
f7c851d4 CP |
1480 | ret = tail - head - 1; |
1481 | if (ret < 0) | |
0b99d589 LL |
1482 | ret += WQUEUESIZE; |
1483 | ||
1484 | /* Limit printer to maxcps */ | |
107b40ad DY |
1485 | if (un->un_type != DGNC_PRINT) |
1486 | ret = dgnc_maxcps_room(ch, ret); | |
0b99d589 LL |
1487 | |
1488 | /* | |
8b07d521 | 1489 | * If we are printer device, leave space for |
0b99d589 LL |
1490 | * possibly both the on and off strings. |
1491 | */ | |
1492 | if (un->un_type == DGNC_PRINT) { | |
1493 | if (!(ch->ch_flags & CH_PRON)) | |
1494 | ret -= ch->ch_digi.digi_onlen; | |
1495 | ret -= ch->ch_digi.digi_offlen; | |
2000c581 | 1496 | } else { |
0b99d589 LL |
1497 | if (ch->ch_flags & CH_PRON) |
1498 | ret -= ch->ch_digi.digi_offlen; | |
1499 | } | |
1500 | ||
1501 | if (ret < 0) | |
1502 | ret = 0; | |
1503 | ||
a44b508a | 1504 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8b07d521 | 1505 | |
8f90ef80 | 1506 | return ret; |
0b99d589 LL |
1507 | } |
1508 | ||
0b99d589 LL |
1509 | /* |
1510 | * dgnc_tty_put_char() | |
1511 | * | |
1512 | * Put a character into ch->ch_buf | |
8b07d521 | 1513 | * |
0b99d589 LL |
1514 | * - used by the line discipline for OPOST processing |
1515 | */ | |
1516 | static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c) | |
1517 | { | |
7127fa28 WF |
1518 | /* Simply call tty_write. */ |
1519 | ||
0b99d589 LL |
1520 | dgnc_tty_write(tty, &c, 1); |
1521 | return 1; | |
1522 | } | |
1523 | ||
0b99d589 LL |
1524 | /* |
1525 | * dgnc_tty_write() | |
1526 | * | |
1527 | * Take data from the user or kernel and send it out to the FEP. | |
1528 | * In here exists all the Transparent Print magic as well. | |
1529 | */ | |
1530 | static int dgnc_tty_write(struct tty_struct *tty, | |
e352d3f1 | 1531 | const unsigned char *buf, int count) |
0b99d589 LL |
1532 | { |
1533 | struct channel_t *ch = NULL; | |
1534 | struct un_t *un = NULL; | |
1535 | int bufcount = 0, n = 0; | |
a44b508a | 1536 | unsigned long flags; |
0b99d589 LL |
1537 | ushort head; |
1538 | ushort tail; | |
1539 | ushort tmask; | |
1540 | uint remain; | |
0b99d589 | 1541 | |
02782a19 | 1542 | if (!tty) |
8f90ef80 | 1543 | return 0; |
0b99d589 LL |
1544 | |
1545 | un = tty->driver_data; | |
1546 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1547 | return 0; |
0b99d589 LL |
1548 | |
1549 | ch = un->un_ch; | |
1550 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1551 | return 0; |
0b99d589 LL |
1552 | |
1553 | if (!count) | |
8f90ef80 | 1554 | return 0; |
0b99d589 | 1555 | |
0b99d589 LL |
1556 | /* |
1557 | * Store original amount of characters passed in. | |
1558 | * This helps to figure out if we should ask the FEP | |
1559 | * to send us an event when it has more space available. | |
1560 | */ | |
0b99d589 | 1561 | |
a44b508a | 1562 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1563 | |
1564 | /* Get our space available for the channel from the board */ | |
1565 | tmask = WQUEUEMASK; | |
1566 | head = (ch->ch_w_head) & tmask; | |
1567 | tail = (ch->ch_w_tail) & tmask; | |
1568 | ||
f7c851d4 CP |
1569 | bufcount = tail - head - 1; |
1570 | if (bufcount < 0) | |
0b99d589 LL |
1571 | bufcount += WQUEUESIZE; |
1572 | ||
0b99d589 LL |
1573 | /* |
1574 | * Limit printer output to maxcps overall, with bursts allowed | |
1575 | * up to bufsize characters. | |
1576 | */ | |
107b40ad DY |
1577 | if (un->un_type != DGNC_PRINT) |
1578 | bufcount = dgnc_maxcps_room(ch, bufcount); | |
0b99d589 LL |
1579 | |
1580 | /* | |
1581 | * Take minimum of what the user wants to send, and the | |
1582 | * space available in the FEP buffer. | |
1583 | */ | |
1584 | count = min(count, bufcount); | |
1585 | ||
7127fa28 WF |
1586 | /* Bail if no space left. */ |
1587 | ||
c84a083b QL |
1588 | if (count <= 0) |
1589 | goto exit_retry; | |
0b99d589 LL |
1590 | |
1591 | /* | |
1592 | * Output the printer ON string, if we are in terminal mode, but | |
1593 | * need to be in printer mode. | |
1594 | */ | |
1595 | if ((un->un_type == DGNC_PRINT) && !(ch->ch_flags & CH_PRON)) { | |
1596 | dgnc_wmove(ch, ch->ch_digi.digi_onstr, | |
e352d3f1 | 1597 | (int)ch->ch_digi.digi_onlen); |
0b99d589 LL |
1598 | head = (ch->ch_w_head) & tmask; |
1599 | ch->ch_flags |= CH_PRON; | |
1600 | } | |
1601 | ||
1602 | /* | |
1603 | * On the other hand, output the printer OFF string, if we are | |
1604 | * currently in printer mode, but need to output to the terminal. | |
1605 | */ | |
1606 | if ((un->un_type != DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { | |
1607 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, | |
e352d3f1 | 1608 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1609 | head = (ch->ch_w_head) & tmask; |
1610 | ch->ch_flags &= ~CH_PRON; | |
1611 | } | |
1612 | ||
0b99d589 LL |
1613 | n = count; |
1614 | ||
1615 | /* | |
1616 | * If the write wraps over the top of the circular buffer, | |
1617 | * move the portion up to the wrap point, and reset the | |
1618 | * pointers to the bottom. | |
1619 | */ | |
1620 | remain = WQUEUESIZE - head; | |
1621 | ||
1622 | if (n >= remain) { | |
1623 | n -= remain; | |
1624 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1625 | head = 0; |
1626 | buf += remain; | |
1627 | } | |
1628 | ||
1629 | if (n > 0) { | |
7127fa28 | 1630 | /* Move rest of data. */ |
0b99d589 LL |
1631 | remain = n; |
1632 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1633 | head += remain; |
1634 | } | |
1635 | ||
1636 | if (count) { | |
1637 | head &= tmask; | |
1638 | ch->ch_w_head = head; | |
1639 | } | |
1640 | ||
0b99d589 | 1641 | /* Update printer buffer empty time. */ |
8d0d4cc5 RS |
1642 | if ((un->un_type == DGNC_PRINT) && (ch->ch_digi.digi_maxcps > 0) && |
1643 | (ch->ch_digi.digi_bufsize > 0)) { | |
90d2a471 | 1644 | ch->ch_cpstime += (HZ * count) / ch->ch_digi.digi_maxcps; |
0b99d589 LL |
1645 | } |
1646 | ||
a74d8e21 | 1647 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1648 | |
0b99d589 LL |
1649 | if (count) { |
1650 | /* | |
1651 | * Channel lock is grabbed and then released | |
1652 | * inside this routine. | |
1653 | */ | |
1654 | ch->ch_bd->bd_ops->copy_data_from_queue_to_uart(ch); | |
1655 | } | |
1656 | ||
8f90ef80 | 1657 | return count; |
c84a083b QL |
1658 | |
1659 | exit_retry: | |
1660 | ||
1661 | spin_unlock_irqrestore(&ch->ch_lock, flags); | |
1662 | return 0; | |
0b99d589 LL |
1663 | } |
1664 | ||
7127fa28 | 1665 | /* Return modem signals to ld. */ |
b74c7461 | 1666 | |
0b99d589 | 1667 | static int dgnc_tty_tiocmget(struct tty_struct *tty) |
0b99d589 LL |
1668 | { |
1669 | struct channel_t *ch; | |
1670 | struct un_t *un; | |
1671 | int result = -EIO; | |
446393e9 | 1672 | unsigned char mstat = 0; |
a44b508a | 1673 | unsigned long flags; |
0b99d589 LL |
1674 | |
1675 | if (!tty || tty->magic != TTY_MAGIC) | |
1676 | return result; | |
1677 | ||
1678 | un = tty->driver_data; | |
1679 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1680 | return result; | |
1681 | ||
1682 | ch = un->un_ch; | |
1683 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1684 | return result; | |
1685 | ||
a44b508a | 1686 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1687 | |
0b7ceaa6 | 1688 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1689 | |
a44b508a | 1690 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1691 | |
1692 | result = 0; | |
1693 | ||
1694 | if (mstat & UART_MCR_DTR) | |
1695 | result |= TIOCM_DTR; | |
1696 | if (mstat & UART_MCR_RTS) | |
1697 | result |= TIOCM_RTS; | |
1698 | if (mstat & UART_MSR_CTS) | |
1699 | result |= TIOCM_CTS; | |
1700 | if (mstat & UART_MSR_DSR) | |
1701 | result |= TIOCM_DSR; | |
1702 | if (mstat & UART_MSR_RI) | |
1703 | result |= TIOCM_RI; | |
1704 | if (mstat & UART_MSR_DCD) | |
1705 | result |= TIOCM_CD; | |
1706 | ||
0b99d589 LL |
1707 | return result; |
1708 | } | |
1709 | ||
0b99d589 LL |
1710 | /* |
1711 | * dgnc_tty_tiocmset() | |
1712 | * | |
1713 | * Set modem signals, called by ld. | |
1714 | */ | |
b74c7461 | 1715 | |
0b99d589 | 1716 | static int dgnc_tty_tiocmset(struct tty_struct *tty, |
e352d3f1 | 1717 | unsigned int set, unsigned int clear) |
0b99d589 | 1718 | { |
03425f55 | 1719 | struct dgnc_board *bd; |
0b99d589 LL |
1720 | struct channel_t *ch; |
1721 | struct un_t *un; | |
1722 | int ret = -EIO; | |
a44b508a | 1723 | unsigned long flags; |
0b99d589 LL |
1724 | |
1725 | if (!tty || tty->magic != TTY_MAGIC) | |
1726 | return ret; | |
1727 | ||
1728 | un = tty->driver_data; | |
1729 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1730 | return ret; | |
1731 | ||
1732 | ch = un->un_ch; | |
1733 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1734 | return ret; | |
1735 | ||
1736 | bd = ch->ch_bd; | |
1737 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1738 | return ret; | |
1739 | ||
a44b508a | 1740 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1741 | |
50667c67 | 1742 | if (set & TIOCM_RTS) |
0b99d589 | 1743 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 1744 | |
50667c67 | 1745 | if (set & TIOCM_DTR) |
0b99d589 | 1746 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 | 1747 | |
50667c67 | 1748 | if (clear & TIOCM_RTS) |
0b99d589 | 1749 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 1750 | |
50667c67 | 1751 | if (clear & TIOCM_DTR) |
0b99d589 | 1752 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
1753 | |
1754 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
1755 | ||
a44b508a | 1756 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1757 | |
8f90ef80 | 1758 | return 0; |
0b99d589 LL |
1759 | } |
1760 | ||
0b99d589 LL |
1761 | /* |
1762 | * dgnc_tty_send_break() | |
1763 | * | |
1764 | * Send a Break, called by ld. | |
1765 | */ | |
1766 | static int dgnc_tty_send_break(struct tty_struct *tty, int msec) | |
1767 | { | |
03425f55 | 1768 | struct dgnc_board *bd; |
0b99d589 LL |
1769 | struct channel_t *ch; |
1770 | struct un_t *un; | |
1771 | int ret = -EIO; | |
a44b508a | 1772 | unsigned long flags; |
0b99d589 LL |
1773 | |
1774 | if (!tty || tty->magic != TTY_MAGIC) | |
1775 | return ret; | |
1776 | ||
1777 | un = tty->driver_data; | |
1778 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1779 | return ret; | |
1780 | ||
1781 | ch = un->un_ch; | |
1782 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1783 | return ret; | |
1784 | ||
1785 | bd = ch->ch_bd; | |
1786 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1787 | return ret; | |
1788 | ||
1789 | switch (msec) { | |
1790 | case -1: | |
1791 | msec = 0xFFFF; | |
1792 | break; | |
1793 | case 0: | |
1794 | msec = 0; | |
1795 | break; | |
1796 | default: | |
1797 | break; | |
1798 | } | |
1799 | ||
a44b508a | 1800 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1801 | |
1802 | ch->ch_bd->bd_ops->send_break(ch, msec); | |
1803 | ||
a44b508a | 1804 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1805 | |
8f90ef80 | 1806 | return 0; |
0b99d589 LL |
1807 | } |
1808 | ||
0b99d589 LL |
1809 | /* |
1810 | * dgnc_tty_wait_until_sent() | |
1811 | * | |
1812 | * wait until data has been transmitted, called by ld. | |
1813 | */ | |
1814 | static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
1815 | { | |
03425f55 | 1816 | struct dgnc_board *bd; |
0b99d589 LL |
1817 | struct channel_t *ch; |
1818 | struct un_t *un; | |
0b99d589 LL |
1819 | |
1820 | if (!tty || tty->magic != TTY_MAGIC) | |
1821 | return; | |
1822 | ||
1823 | un = tty->driver_data; | |
1824 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1825 | return; | |
1826 | ||
1827 | ch = un->un_ch; | |
1828 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1829 | return; | |
1830 | ||
1831 | bd = ch->ch_bd; | |
1832 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1833 | return; | |
1834 | ||
2d9920ec | 1835 | bd->bd_ops->drain(tty, 0); |
8b07d521 | 1836 | } |
0b99d589 | 1837 | |
0b99d589 LL |
1838 | /* |
1839 | * dgnc_send_xchar() | |
1840 | * | |
1841 | * send a high priority character, called by ld. | |
1842 | */ | |
1843 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char c) | |
1844 | { | |
03425f55 | 1845 | struct dgnc_board *bd; |
0b99d589 LL |
1846 | struct channel_t *ch; |
1847 | struct un_t *un; | |
a44b508a | 1848 | unsigned long flags; |
0b99d589 LL |
1849 | |
1850 | if (!tty || tty->magic != TTY_MAGIC) | |
1851 | return; | |
1852 | ||
1853 | un = tty->driver_data; | |
1854 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1855 | return; | |
1856 | ||
1857 | ch = un->un_ch; | |
1858 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1859 | return; | |
1860 | ||
1861 | bd = ch->ch_bd; | |
1862 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1863 | return; | |
1864 | ||
f3dadd29 | 1865 | dev_dbg(tty->dev, "dgnc_tty_send_xchar start\n"); |
0b99d589 | 1866 | |
a44b508a | 1867 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1868 | bd->bd_ops->send_immediate_char(ch, c); |
a44b508a | 1869 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1870 | |
f3dadd29 | 1871 | dev_dbg(tty->dev, "dgnc_tty_send_xchar finish\n"); |
8b07d521 | 1872 | } |
0b99d589 | 1873 | |
7127fa28 WF |
1874 | /* Return modem signals to ld. */ |
1875 | ||
0b99d589 LL |
1876 | static inline int dgnc_get_mstat(struct channel_t *ch) |
1877 | { | |
1878 | unsigned char mstat; | |
290e3aba | 1879 | int result = 0; |
a44b508a | 1880 | unsigned long flags; |
0b99d589 | 1881 | |
0b99d589 | 1882 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
8f90ef80 | 1883 | return -ENXIO; |
0b99d589 | 1884 | |
a44b508a | 1885 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1886 | |
0b7ceaa6 | 1887 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1888 | |
a44b508a | 1889 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1890 | |
0b99d589 LL |
1891 | if (mstat & UART_MCR_DTR) |
1892 | result |= TIOCM_DTR; | |
1893 | if (mstat & UART_MCR_RTS) | |
1894 | result |= TIOCM_RTS; | |
1895 | if (mstat & UART_MSR_CTS) | |
1896 | result |= TIOCM_CTS; | |
1897 | if (mstat & UART_MSR_DSR) | |
1898 | result |= TIOCM_DSR; | |
1899 | if (mstat & UART_MSR_RI) | |
1900 | result |= TIOCM_RI; | |
1901 | if (mstat & UART_MSR_DCD) | |
1902 | result |= TIOCM_CD; | |
1903 | ||
8f90ef80 | 1904 | return result; |
0b99d589 LL |
1905 | } |
1906 | ||
7127fa28 WF |
1907 | /* Return modem signals to ld. */ |
1908 | ||
851f306d CM |
1909 | static int dgnc_get_modem_info(struct channel_t *ch, |
1910 | unsigned int __user *value) | |
0b99d589 | 1911 | { |
a5b90ef7 | 1912 | return put_user(dgnc_get_mstat(ch), value); |
0b99d589 LL |
1913 | } |
1914 | ||
0b99d589 LL |
1915 | /* |
1916 | * dgnc_set_modem_info() | |
1917 | * | |
1918 | * Set modem signals, called by ld. | |
1919 | */ | |
c23b48e0 | 1920 | static int dgnc_set_modem_info(struct channel_t *ch, |
851f306d CM |
1921 | unsigned int command, |
1922 | unsigned int __user *value) | |
0b99d589 | 1923 | { |
0b99d589 LL |
1924 | int ret = -ENXIO; |
1925 | unsigned int arg = 0; | |
a44b508a | 1926 | unsigned long flags; |
0b99d589 | 1927 | |
0b99d589 LL |
1928 | ret = get_user(arg, value); |
1929 | if (ret) | |
8f90ef80 | 1930 | return ret; |
0b99d589 LL |
1931 | |
1932 | switch (command) { | |
1933 | case TIOCMBIS: | |
50667c67 | 1934 | if (arg & TIOCM_RTS) |
0b99d589 | 1935 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 1936 | |
50667c67 | 1937 | if (arg & TIOCM_DTR) |
0b99d589 | 1938 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 LL |
1939 | |
1940 | break; | |
1941 | ||
1942 | case TIOCMBIC: | |
50667c67 | 1943 | if (arg & TIOCM_RTS) |
0b99d589 | 1944 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 1945 | |
50667c67 | 1946 | if (arg & TIOCM_DTR) |
0b99d589 | 1947 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
1948 | |
1949 | break; | |
1950 | ||
90d2a471 | 1951 | case TIOCMSET: |
0b99d589 | 1952 | |
50667c67 | 1953 | if (arg & TIOCM_RTS) |
0b99d589 | 1954 | ch->ch_mostat |= UART_MCR_RTS; |
50667c67 | 1955 | else |
0b99d589 | 1956 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 1957 | |
50667c67 | 1958 | if (arg & TIOCM_DTR) |
0b99d589 | 1959 | ch->ch_mostat |= UART_MCR_DTR; |
50667c67 | 1960 | else |
0b99d589 | 1961 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
1962 | |
1963 | break; | |
1964 | ||
1965 | default: | |
8f90ef80 | 1966 | return -EINVAL; |
0b99d589 LL |
1967 | } |
1968 | ||
a44b508a | 1969 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1970 | |
1971 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
1972 | ||
a44b508a | 1973 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1974 | |
8f90ef80 | 1975 | return 0; |
0b99d589 LL |
1976 | } |
1977 | ||
0b99d589 | 1978 | /* |
8b07d521 | 1979 | * dgnc_tty_digigeta() |
0b99d589 LL |
1980 | * |
1981 | * Ioctl to get the information for ditty. | |
0b99d589 | 1982 | */ |
851f306d CM |
1983 | static int dgnc_tty_digigeta(struct tty_struct *tty, |
1984 | struct digi_t __user *retinfo) | |
0b99d589 LL |
1985 | { |
1986 | struct channel_t *ch; | |
1987 | struct un_t *un; | |
1988 | struct digi_t tmp; | |
a44b508a | 1989 | unsigned long flags; |
0b99d589 LL |
1990 | |
1991 | if (!retinfo) | |
8f90ef80 | 1992 | return -EFAULT; |
0b99d589 LL |
1993 | |
1994 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 1995 | return -EFAULT; |
0b99d589 LL |
1996 | |
1997 | un = tty->driver_data; | |
1998 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1999 | return -EFAULT; |
0b99d589 LL |
2000 | |
2001 | ch = un->un_ch; | |
2002 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2003 | return -EFAULT; |
0b99d589 LL |
2004 | |
2005 | memset(&tmp, 0, sizeof(tmp)); | |
2006 | ||
a44b508a | 2007 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2008 | memcpy(&tmp, &ch->ch_digi, sizeof(tmp)); |
a44b508a | 2009 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2010 | |
2011 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) | |
8f90ef80 | 2012 | return -EFAULT; |
0b99d589 | 2013 | |
8f90ef80 | 2014 | return 0; |
0b99d589 LL |
2015 | } |
2016 | ||
0b99d589 | 2017 | /* |
8b07d521 | 2018 | * dgnc_tty_digiseta() |
0b99d589 LL |
2019 | * |
2020 | * Ioctl to set the information for ditty. | |
0b99d589 | 2021 | */ |
851f306d CM |
2022 | static int dgnc_tty_digiseta(struct tty_struct *tty, |
2023 | struct digi_t __user *new_info) | |
0b99d589 | 2024 | { |
03425f55 | 2025 | struct dgnc_board *bd; |
0b99d589 LL |
2026 | struct channel_t *ch; |
2027 | struct un_t *un; | |
2028 | struct digi_t new_digi; | |
a44b508a | 2029 | unsigned long flags; |
0b99d589 | 2030 | |
0b99d589 | 2031 | if (!tty || tty->magic != TTY_MAGIC) |
8f90ef80 | 2032 | return -EFAULT; |
0b99d589 LL |
2033 | |
2034 | un = tty->driver_data; | |
2035 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2036 | return -EFAULT; |
0b99d589 LL |
2037 | |
2038 | ch = un->un_ch; | |
2039 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2040 | return -EFAULT; |
0b99d589 LL |
2041 | |
2042 | bd = ch->ch_bd; | |
2043 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2044 | return -EFAULT; |
0b99d589 | 2045 | |
f1e51745 | 2046 | if (copy_from_user(&new_digi, new_info, sizeof(new_digi))) |
8f90ef80 | 2047 | return -EFAULT; |
0b99d589 | 2048 | |
a44b508a | 2049 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2050 | |
16465dcd | 2051 | /* Handle transitions to and from RTS Toggle. */ |
7127fa28 | 2052 | |
851f306d CM |
2053 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2054 | (new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 | 2055 | ch->ch_mostat &= ~(UART_MCR_RTS); |
851f306d CM |
2056 | if ((ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2057 | !(new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 LL |
2058 | ch->ch_mostat |= (UART_MCR_RTS); |
2059 | ||
16465dcd | 2060 | /* Handle transitions to and from DTR Toggle. */ |
7127fa28 | 2061 | |
851f306d CM |
2062 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2063 | (new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 | 2064 | ch->ch_mostat &= ~(UART_MCR_DTR); |
851f306d CM |
2065 | if ((ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2066 | !(new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 LL |
2067 | ch->ch_mostat |= (UART_MCR_DTR); |
2068 | ||
a07bf39a | 2069 | memcpy(&ch->ch_digi, &new_digi, sizeof(new_digi)); |
0b99d589 | 2070 | |
8b07d521 | 2071 | if (ch->ch_digi.digi_maxcps < 1) |
0b99d589 LL |
2072 | ch->ch_digi.digi_maxcps = 1; |
2073 | ||
8b07d521 | 2074 | if (ch->ch_digi.digi_maxcps > 10000) |
0b99d589 LL |
2075 | ch->ch_digi.digi_maxcps = 10000; |
2076 | ||
2077 | if (ch->ch_digi.digi_bufsize < 10) | |
2078 | ch->ch_digi.digi_bufsize = 10; | |
2079 | ||
2080 | if (ch->ch_digi.digi_maxchar < 1) | |
2081 | ch->ch_digi.digi_maxchar = 1; | |
2082 | ||
2083 | if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize) | |
2084 | ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize; | |
2085 | ||
2086 | if (ch->ch_digi.digi_onlen > DIGI_PLEN) | |
2087 | ch->ch_digi.digi_onlen = DIGI_PLEN; | |
2088 | ||
2089 | if (ch->ch_digi.digi_offlen > DIGI_PLEN) | |
2090 | ch->ch_digi.digi_offlen = DIGI_PLEN; | |
2091 | ||
2092 | ch->ch_bd->bd_ops->param(tty); | |
2093 | ||
a44b508a | 2094 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2095 | |
8f90ef80 | 2096 | return 0; |
0b99d589 LL |
2097 | } |
2098 | ||
7127fa28 WF |
2099 | /* dgnc_set_termios() */ |
2100 | ||
851f306d CM |
2101 | static void dgnc_tty_set_termios(struct tty_struct *tty, |
2102 | struct ktermios *old_termios) | |
0b99d589 | 2103 | { |
03425f55 | 2104 | struct dgnc_board *bd; |
0b99d589 LL |
2105 | struct channel_t *ch; |
2106 | struct un_t *un; | |
a44b508a | 2107 | unsigned long flags; |
0b99d589 LL |
2108 | |
2109 | if (!tty || tty->magic != TTY_MAGIC) | |
2110 | return; | |
2111 | ||
2112 | un = tty->driver_data; | |
2113 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2114 | return; | |
2115 | ||
2116 | ch = un->un_ch; | |
2117 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2118 | return; | |
2119 | ||
2120 | bd = ch->ch_bd; | |
2121 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2122 | return; | |
2123 | ||
a44b508a | 2124 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2125 | |
22e3de76 LL |
2126 | ch->ch_c_cflag = tty->termios.c_cflag; |
2127 | ch->ch_c_iflag = tty->termios.c_iflag; | |
2128 | ch->ch_c_oflag = tty->termios.c_oflag; | |
2129 | ch->ch_c_lflag = tty->termios.c_lflag; | |
2130 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
2131 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
2132 | |
2133 | ch->ch_bd->bd_ops->param(tty); | |
2134 | dgnc_carrier(ch); | |
2135 | ||
a44b508a | 2136 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2137 | } |
2138 | ||
0b99d589 LL |
2139 | static void dgnc_tty_throttle(struct tty_struct *tty) |
2140 | { | |
2141 | struct channel_t *ch; | |
2142 | struct un_t *un; | |
a44b508a | 2143 | unsigned long flags; |
0b99d589 LL |
2144 | |
2145 | if (!tty || tty->magic != TTY_MAGIC) | |
2146 | return; | |
2147 | ||
2148 | un = tty->driver_data; | |
2149 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2150 | return; | |
8b07d521 | 2151 | |
90d2a471 LL |
2152 | ch = un->un_ch; |
2153 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2154 | return; | |
0b99d589 | 2155 | |
a44b508a | 2156 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2157 | |
2158 | ch->ch_flags |= (CH_FORCED_STOPI); | |
2159 | ||
a44b508a | 2160 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2161 | } |
2162 | ||
0b99d589 LL |
2163 | static void dgnc_tty_unthrottle(struct tty_struct *tty) |
2164 | { | |
2165 | struct channel_t *ch; | |
2166 | struct un_t *un; | |
a44b508a | 2167 | unsigned long flags; |
0b99d589 LL |
2168 | |
2169 | if (!tty || tty->magic != TTY_MAGIC) | |
2170 | return; | |
2171 | ||
2172 | un = tty->driver_data; | |
2173 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2174 | return; | |
8b07d521 | 2175 | |
90d2a471 LL |
2176 | ch = un->un_ch; |
2177 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2178 | return; | |
0b99d589 | 2179 | |
a44b508a | 2180 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2181 | |
2182 | ch->ch_flags &= ~(CH_FORCED_STOPI); | |
2183 | ||
a44b508a | 2184 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2185 | } |
2186 | ||
0b99d589 LL |
2187 | static void dgnc_tty_start(struct tty_struct *tty) |
2188 | { | |
03425f55 | 2189 | struct dgnc_board *bd; |
0b99d589 LL |
2190 | struct channel_t *ch; |
2191 | struct un_t *un; | |
a44b508a | 2192 | unsigned long flags; |
0b99d589 LL |
2193 | |
2194 | if (!tty || tty->magic != TTY_MAGIC) | |
2195 | return; | |
2196 | ||
2197 | un = tty->driver_data; | |
2198 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2199 | return; | |
8b07d521 | 2200 | |
90d2a471 LL |
2201 | ch = un->un_ch; |
2202 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2203 | return; | |
0b99d589 LL |
2204 | |
2205 | bd = ch->ch_bd; | |
2206 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2207 | return; | |
2208 | ||
a44b508a | 2209 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2210 | |
2211 | ch->ch_flags &= ~(CH_FORCED_STOP); | |
2212 | ||
a44b508a | 2213 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2214 | } |
2215 | ||
0b99d589 LL |
2216 | static void dgnc_tty_stop(struct tty_struct *tty) |
2217 | { | |
03425f55 | 2218 | struct dgnc_board *bd; |
0b99d589 LL |
2219 | struct channel_t *ch; |
2220 | struct un_t *un; | |
a44b508a | 2221 | unsigned long flags; |
0b99d589 LL |
2222 | |
2223 | if (!tty || tty->magic != TTY_MAGIC) | |
2224 | return; | |
2225 | ||
2226 | un = tty->driver_data; | |
2227 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2228 | return; | |
8b07d521 | 2229 | |
90d2a471 LL |
2230 | ch = un->un_ch; |
2231 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2232 | return; | |
0b99d589 LL |
2233 | |
2234 | bd = ch->ch_bd; | |
2235 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2236 | return; | |
2237 | ||
a44b508a | 2238 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2239 | |
2240 | ch->ch_flags |= (CH_FORCED_STOP); | |
2241 | ||
a44b508a | 2242 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2243 | } |
2244 | ||
8b07d521 | 2245 | /* |
0b99d589 LL |
2246 | * dgnc_tty_flush_chars() |
2247 | * | |
2248 | * Flush the cook buffer | |
2249 | * | |
2250 | * Note to self, and any other poor souls who venture here: | |
2251 | * | |
2252 | * flush in this case DOES NOT mean dispose of the data. | |
2253 | * instead, it means "stop buffering and send it if you | |
2254 | * haven't already." Just guess how I figured that out... SRW 2-Jun-98 | |
2255 | * | |
2256 | * It is also always called in interrupt context - JAR 8-Sept-99 | |
2257 | */ | |
2258 | static void dgnc_tty_flush_chars(struct tty_struct *tty) | |
2259 | { | |
03425f55 | 2260 | struct dgnc_board *bd; |
0b99d589 LL |
2261 | struct channel_t *ch; |
2262 | struct un_t *un; | |
a44b508a | 2263 | unsigned long flags; |
0b99d589 LL |
2264 | |
2265 | if (!tty || tty->magic != TTY_MAGIC) | |
2266 | return; | |
2267 | ||
2268 | un = tty->driver_data; | |
2269 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2270 | return; | |
8b07d521 | 2271 | |
90d2a471 LL |
2272 | ch = un->un_ch; |
2273 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2274 | return; | |
0b99d589 LL |
2275 | |
2276 | bd = ch->ch_bd; | |
2277 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2278 | return; | |
2279 | ||
a44b508a | 2280 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2281 | |
2282 | /* Do something maybe here */ | |
2283 | ||
a44b508a | 2284 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2285 | } |
2286 | ||
0b99d589 LL |
2287 | /* |
2288 | * dgnc_tty_flush_buffer() | |
8b07d521 | 2289 | * |
0b99d589 LL |
2290 | * Flush Tx buffer (make in == out) |
2291 | */ | |
2292 | static void dgnc_tty_flush_buffer(struct tty_struct *tty) | |
2293 | { | |
2294 | struct channel_t *ch; | |
2295 | struct un_t *un; | |
a44b508a | 2296 | unsigned long flags; |
0b99d589 LL |
2297 | |
2298 | if (!tty || tty->magic != TTY_MAGIC) | |
2299 | return; | |
2300 | ||
2301 | un = tty->driver_data; | |
2302 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2303 | return; | |
8b07d521 | 2304 | |
90d2a471 LL |
2305 | ch = un->un_ch; |
2306 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2307 | return; | |
0b99d589 | 2308 | |
a44b508a | 2309 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2310 | |
2311 | ch->ch_flags &= ~CH_STOP; | |
2312 | ||
2313 | /* Flush our write queue */ | |
2314 | ch->ch_w_head = ch->ch_w_tail; | |
2315 | ||
2316 | /* Flush UARTs transmit FIFO */ | |
2317 | ch->ch_bd->bd_ops->flush_uart_write(ch); | |
2318 | ||
adcb56f9 RS |
2319 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
2320 | ch->ch_tun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2321 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2322 | } | |
adcb56f9 RS |
2323 | if (ch->ch_pun.un_flags & (UN_LOW | UN_EMPTY)) { |
2324 | ch->ch_pun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2325 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2326 | } | |
2327 | ||
a44b508a | 2328 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2329 | } |
2330 | ||
9b33f918 FA |
2331 | /* |
2332 | * dgnc_wake_up_unit() | |
2333 | * | |
2334 | * Wakes up processes waiting in the unit's (teminal/printer) wait queue | |
2335 | */ | |
2336 | static void dgnc_wake_up_unit(struct un_t *unit) | |
2337 | { | |
2338 | unit->un_flags &= ~(UN_LOW | UN_EMPTY); | |
2339 | wake_up_interruptible(&unit->un_flags_wait); | |
2340 | } | |
2341 | ||
7127fa28 | 2342 | /* The IOCTL function and all of its helpers */ |
8b07d521 | 2343 | |
0b99d589 LL |
2344 | /* |
2345 | * dgnc_tty_ioctl() | |
2346 | * | |
2347 | * The usual assortment of ioctl's | |
2348 | */ | |
a31cefa2 | 2349 | static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
e352d3f1 | 2350 | unsigned long arg) |
0b99d589 | 2351 | { |
03425f55 | 2352 | struct dgnc_board *bd; |
8670a56f | 2353 | struct board_ops *ch_bd_ops; |
0b99d589 LL |
2354 | struct channel_t *ch; |
2355 | struct un_t *un; | |
2356 | int rc; | |
a44b508a | 2357 | unsigned long flags; |
6f418259 | 2358 | void __user *uarg = (void __user *)arg; |
0b99d589 LL |
2359 | |
2360 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2361 | return -ENODEV; |
0b99d589 LL |
2362 | |
2363 | un = tty->driver_data; | |
2364 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2365 | return -ENODEV; |
0b99d589 LL |
2366 | |
2367 | ch = un->un_ch; | |
2368 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2369 | return -ENODEV; |
0b99d589 LL |
2370 | |
2371 | bd = ch->ch_bd; | |
2372 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2373 | return -ENODEV; |
0b99d589 | 2374 | |
8670a56f DY |
2375 | ch_bd_ops = bd->bd_ops; |
2376 | ||
a44b508a | 2377 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2378 | |
2379 | if (un->un_open_count <= 0) { | |
a44b508a | 2380 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2381 | return -EIO; |
0b99d589 LL |
2382 | } |
2383 | ||
2384 | switch (cmd) { | |
0b99d589 LL |
2385 | /* Here are all the standard ioctl's that we MUST implement */ |
2386 | ||
2387 | case TCSBRK: | |
2388 | /* | |
8b07d521 | 2389 | * TCSBRK is SVID version: non-zero arg --> no break |
0b99d589 LL |
2390 | * this behaviour is exploited by tcdrain(). |
2391 | * | |
2392 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be | |
2393 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2394 | * in the middle: 0.375 seconds. | |
2395 | */ | |
2396 | rc = tty_check_change(tty); | |
a44b508a | 2397 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2398 | if (rc) |
8f90ef80 | 2399 | return rc; |
0b99d589 | 2400 | |
8670a56f | 2401 | rc = ch_bd_ops->drain(tty, 0); |
0b99d589 | 2402 | |
f1e51745 | 2403 | if (rc) |
8f90ef80 | 2404 | return -EINTR; |
0b99d589 | 2405 | |
a44b508a | 2406 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2407 | |
3c4019d3 | 2408 | if (((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP)) |
8670a56f | 2409 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2410 | |
a44b508a | 2411 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2412 | |
8f90ef80 | 2413 | return 0; |
0b99d589 | 2414 | |
0b99d589 | 2415 | case TCSBRKP: |
7127fa28 WF |
2416 | /* |
2417 | * support for POSIX tcsendbreak() | |
0b99d589 LL |
2418 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be |
2419 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2420 | * in the middle: 0.375 seconds. | |
2421 | */ | |
2422 | rc = tty_check_change(tty); | |
a44b508a | 2423 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2424 | if (rc) |
8f90ef80 | 2425 | return rc; |
0b99d589 | 2426 | |
8670a56f | 2427 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2428 | if (rc) |
8f90ef80 | 2429 | return -EINTR; |
0b99d589 | 2430 | |
a44b508a | 2431 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2432 | |
8670a56f | 2433 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2434 | |
a44b508a | 2435 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2436 | |
8f90ef80 | 2437 | return 0; |
0b99d589 LL |
2438 | |
2439 | case TIOCSBRK: | |
2440 | rc = tty_check_change(tty); | |
a44b508a | 2441 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2442 | if (rc) |
8f90ef80 | 2443 | return rc; |
0b99d589 | 2444 | |
8670a56f | 2445 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2446 | if (rc) |
8f90ef80 | 2447 | return -EINTR; |
0b99d589 | 2448 | |
a44b508a | 2449 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2450 | |
8670a56f | 2451 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2452 | |
a44b508a | 2453 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2454 | |
8f90ef80 | 2455 | return 0; |
0b99d589 LL |
2456 | |
2457 | case TIOCCBRK: | |
2458 | /* Do Nothing */ | |
a44b508a | 2459 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2460 | return 0; |
2461 | ||
2462 | case TIOCGSOFTCAR: | |
2463 | ||
a44b508a | 2464 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2465 | |
106d43f1 RS |
2466 | return put_user(C_CLOCAL(tty) ? 1 : 0, |
2467 | (unsigned long __user *)arg); | |
0b99d589 LL |
2468 | |
2469 | case TIOCSSOFTCAR: | |
2470 | ||
a44b508a | 2471 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2472 | rc = get_user(arg, (unsigned long __user *)arg); |
0b99d589 | 2473 | if (rc) |
8f90ef80 | 2474 | return rc; |
0b99d589 | 2475 | |
a44b508a | 2476 | spin_lock_irqsave(&ch->ch_lock, flags); |
851f306d CM |
2477 | tty->termios.c_cflag = ((tty->termios.c_cflag & ~CLOCAL) | |
2478 | (arg ? CLOCAL : 0)); | |
8670a56f | 2479 | ch_bd_ops->param(tty); |
a44b508a | 2480 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2481 | |
8f90ef80 | 2482 | return 0; |
8b07d521 | 2483 | |
0b99d589 | 2484 | case TIOCMGET: |
a44b508a | 2485 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2486 | return dgnc_get_modem_info(ch, uarg); |
0b99d589 LL |
2487 | |
2488 | case TIOCMBIS: | |
2489 | case TIOCMBIC: | |
2490 | case TIOCMSET: | |
a44b508a | 2491 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
c23b48e0 | 2492 | return dgnc_set_modem_info(ch, cmd, uarg); |
0b99d589 | 2493 | |
7127fa28 | 2494 | /* Here are any additional ioctl's that we want to implement */ |
8b07d521 LL |
2495 | |
2496 | case TCFLSH: | |
0b99d589 LL |
2497 | /* |
2498 | * The linux tty driver doesn't have a flush | |
2499 | * input routine for the driver, assuming all backed | |
2500 | * up data is in the line disc. buffers. However, | |
2501 | * we all know that's not the case. Here, we | |
2502 | * act on the ioctl, but then lie and say we didn't | |
2503 | * so the line discipline will process the flush | |
2504 | * also. | |
8b07d521 | 2505 | */ |
0b99d589 LL |
2506 | rc = tty_check_change(tty); |
2507 | if (rc) { | |
a44b508a | 2508 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2509 | return rc; |
0b99d589 LL |
2510 | } |
2511 | ||
2512 | if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) { | |
2513 | ch->ch_r_head = ch->ch_r_tail; | |
8670a56f | 2514 | ch_bd_ops->flush_uart_read(ch); |
0b99d589 LL |
2515 | /* Force queue flow control to be released, if needed */ |
2516 | dgnc_check_queue_flow_control(ch); | |
2517 | } | |
2518 | ||
2519 | if ((arg == TCOFLUSH) || (arg == TCIOFLUSH)) { | |
2520 | if (!(un->un_type == DGNC_PRINT)) { | |
2521 | ch->ch_w_head = ch->ch_w_tail; | |
8670a56f | 2522 | ch_bd_ops->flush_uart_write(ch); |
0b99d589 | 2523 | |
9b33f918 FA |
2524 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) |
2525 | dgnc_wake_up_unit(&ch->ch_tun); | |
2526 | ||
2527 | if (ch->ch_pun.un_flags & (UN_LOW | UN_EMPTY)) | |
2528 | dgnc_wake_up_unit(&ch->ch_pun); | |
0b99d589 LL |
2529 | } |
2530 | } | |
2531 | ||
8b07d521 | 2532 | /* pretend we didn't recognize this IOCTL */ |
a44b508a | 2533 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2534 | return -ENOIOCTLCMD; |
0b99d589 LL |
2535 | case TCSETSF: |
2536 | case TCSETSW: | |
2537 | /* | |
2538 | * The linux tty driver doesn't have a flush | |
2539 | * input routine for the driver, assuming all backed | |
2540 | * up data is in the line disc. buffers. However, | |
2541 | * we all know that's not the case. Here, we | |
2542 | * act on the ioctl, but then lie and say we didn't | |
2543 | * so the line discipline will process the flush | |
2544 | * also. | |
2545 | */ | |
2546 | if (cmd == TCSETSF) { | |
2547 | /* flush rx */ | |
2548 | ch->ch_flags &= ~CH_STOP; | |
2549 | ch->ch_r_head = ch->ch_r_tail; | |
8670a56f | 2550 | ch_bd_ops->flush_uart_read(ch); |
0b99d589 LL |
2551 | /* Force queue flow control to be released, if needed */ |
2552 | dgnc_check_queue_flow_control(ch); | |
2553 | } | |
2554 | ||
2555 | /* now wait for all the output to drain */ | |
a44b508a | 2556 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2557 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2558 | if (rc) |
8f90ef80 | 2559 | return -EINTR; |
0b99d589 LL |
2560 | |
2561 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2562 | return -ENOIOCTLCMD; |
0b99d589 LL |
2563 | |
2564 | case TCSETAW: | |
2565 | ||
a44b508a | 2566 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2567 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2568 | if (rc) |
8f90ef80 | 2569 | return -EINTR; |
0b99d589 LL |
2570 | |
2571 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2572 | return -ENOIOCTLCMD; |
0b99d589 LL |
2573 | |
2574 | case TCXONC: | |
a44b508a | 2575 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2576 | /* Make the ld do it */ |
8f90ef80 | 2577 | return -ENOIOCTLCMD; |
0b99d589 LL |
2578 | |
2579 | case DIGI_GETA: | |
2580 | /* get information for ditty */ | |
a44b508a | 2581 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2582 | return dgnc_tty_digigeta(tty, uarg); |
0b99d589 LL |
2583 | |
2584 | case DIGI_SETAW: | |
2585 | case DIGI_SETAF: | |
2586 | ||
2587 | /* set information for ditty */ | |
2588 | if (cmd == (DIGI_SETAW)) { | |
a44b508a | 2589 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2590 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 SL |
2591 | |
2592 | if (rc) | |
8f90ef80 | 2593 | return -EINTR; |
f1e51745 | 2594 | |
a44b508a | 2595 | spin_lock_irqsave(&ch->ch_lock, flags); |
2000c581 | 2596 | } else { |
0b99d589 LL |
2597 | tty_ldisc_flush(tty); |
2598 | } | |
2599 | /* fall thru */ | |
2600 | ||
2601 | case DIGI_SETA: | |
a44b508a | 2602 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2603 | return dgnc_tty_digiseta(tty, uarg); |
8b07d521 | 2604 | |
0b99d589 LL |
2605 | case DIGI_LOOPBACK: |
2606 | { | |
2607 | uint loopback = 0; | |
7127fa28 WF |
2608 | /* |
2609 | * Let go of locks when accessing user space, | |
851f306d | 2610 | * could sleep |
9d5b4d83 | 2611 | */ |
a44b508a | 2612 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2613 | rc = get_user(loopback, (unsigned int __user *)arg); |
0b99d589 | 2614 | if (rc) |
8f90ef80 | 2615 | return rc; |
a44b508a | 2616 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2617 | |
8b07d521 | 2618 | /* Enable/disable internal loopback for this port */ |
0b99d589 LL |
2619 | if (loopback) |
2620 | ch->ch_flags |= CH_LOOPBACK; | |
2621 | else | |
2622 | ch->ch_flags &= ~(CH_LOOPBACK); | |
2623 | ||
8670a56f | 2624 | ch_bd_ops->param(tty); |
a44b508a | 2625 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2626 | return 0; |
90d2a471 | 2627 | } |
0b99d589 LL |
2628 | |
2629 | case DIGI_GETCUSTOMBAUD: | |
a44b508a | 2630 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
106d43f1 RS |
2631 | return put_user(ch->ch_custom_speed, |
2632 | (unsigned int __user *)arg); | |
0b99d589 LL |
2633 | |
2634 | case DIGI_SETCUSTOMBAUD: | |
2635 | { | |
93c76c9c | 2636 | int new_rate; |
0b99d589 | 2637 | /* Let go of locks when accessing user space, could sleep */ |
a44b508a | 2638 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2639 | rc = get_user(new_rate, (int __user *)arg); |
0b99d589 | 2640 | if (rc) |
8f90ef80 | 2641 | return rc; |
a44b508a | 2642 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2643 | dgnc_set_custom_speed(ch, new_rate); |
8670a56f | 2644 | ch_bd_ops->param(tty); |
a44b508a | 2645 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2646 | return 0; |
90d2a471 | 2647 | } |
0b99d589 LL |
2648 | |
2649 | /* | |
2650 | * This ioctl allows insertion of a character into the front | |
2651 | * of any pending data to be transmitted. | |
2652 | * | |
16465dcd | 2653 | * This ioctl is to satisfy the "Send Character Immediate" |
0b99d589 LL |
2654 | * call that the RealPort protocol spec requires. |
2655 | */ | |
2656 | case DIGI_REALPORT_SENDIMMEDIATE: | |
2657 | { | |
2658 | unsigned char c; | |
0eaa02e6 | 2659 | |
a44b508a | 2660 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2661 | rc = get_user(c, (unsigned char __user *)arg); |
0b99d589 | 2662 | if (rc) |
8f90ef80 | 2663 | return rc; |
a44b508a | 2664 | spin_lock_irqsave(&ch->ch_lock, flags); |
8670a56f | 2665 | ch_bd_ops->send_immediate_char(ch, c); |
a44b508a | 2666 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2667 | return 0; |
0b99d589 LL |
2668 | } |
2669 | ||
2670 | /* | |
2671 | * This ioctl returns all the current counts for the port. | |
2672 | * | |
16465dcd | 2673 | * This ioctl is to satisfy the "Line Error Counters" |
0b99d589 LL |
2674 | * call that the RealPort protocol spec requires. |
2675 | */ | |
2676 | case DIGI_REALPORT_GETCOUNTERS: | |
2677 | { | |
2678 | struct digi_getcounter buf; | |
2679 | ||
2680 | buf.norun = ch->ch_err_overrun; | |
feba47a7 | 2681 | buf.noflow = 0; /* The driver doesn't keep this stat */ |
0b99d589 LL |
2682 | buf.nframe = ch->ch_err_frame; |
2683 | buf.nparity = ch->ch_err_parity; | |
2684 | buf.nbreak = ch->ch_err_break; | |
2685 | buf.rbytes = ch->ch_rxcount; | |
2686 | buf.tbytes = ch->ch_txcount; | |
2687 | ||
a44b508a | 2688 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2689 | |
50667c67 | 2690 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2691 | return -EFAULT; |
50667c67 | 2692 | |
8f90ef80 | 2693 | return 0; |
0b99d589 LL |
2694 | } |
2695 | ||
2696 | /* | |
2697 | * This ioctl returns all current events. | |
2698 | * | |
16465dcd | 2699 | * This ioctl is to satisfy the "Event Reporting" |
0b99d589 | 2700 | * call that the RealPort protocol spec requires. |
90d2a471 | 2701 | */ |
0b99d589 LL |
2702 | case DIGI_REALPORT_GETEVENTS: |
2703 | { | |
2704 | unsigned int events = 0; | |
2705 | ||
2706 | /* NOTE: MORE EVENTS NEEDS TO BE ADDED HERE */ | |
2707 | if (ch->ch_flags & CH_BREAK_SENDING) | |
2708 | events |= EV_TXB; | |
851f306d CM |
2709 | if ((ch->ch_flags & CH_STOP) || |
2710 | (ch->ch_flags & CH_FORCED_STOP)) | |
0b99d589 | 2711 | events |= (EV_OPU | EV_OPS); |
50667c67 | 2712 | |
851f306d CM |
2713 | if ((ch->ch_flags & CH_STOPI) || |
2714 | (ch->ch_flags & CH_FORCED_STOPI)) | |
0b99d589 | 2715 | events |= (EV_IPU | EV_IPS); |
0b99d589 | 2716 | |
a44b508a | 2717 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
106d43f1 | 2718 | return put_user(events, (unsigned int __user *)arg); |
0b99d589 LL |
2719 | } |
2720 | ||
2721 | /* | |
2722 | * This ioctl returns TOUT and TIN counters based | |
2723 | * upon the values passed in by the RealPort Server. | |
2724 | * It also passes back whether the UART Transmitter is | |
2725 | * empty as well. | |
90d2a471 | 2726 | */ |
0b99d589 LL |
2727 | case DIGI_REALPORT_GETBUFFERS: |
2728 | { | |
2729 | struct digi_getbuffer buf; | |
2730 | int tdist; | |
2731 | int count; | |
2732 | ||
a44b508a | 2733 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2734 | |
7127fa28 WF |
2735 | /* Get data from user first. */ |
2736 | ||
50667c67 | 2737 | if (copy_from_user(&buf, uarg, sizeof(buf))) |
8f90ef80 | 2738 | return -EFAULT; |
0b99d589 | 2739 | |
a44b508a | 2740 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2741 | |
7127fa28 WF |
2742 | /* Figure out how much data is in our RX and TX queues. */ |
2743 | ||
0b99d589 LL |
2744 | buf.rxbuf = (ch->ch_r_head - ch->ch_r_tail) & RQUEUEMASK; |
2745 | buf.txbuf = (ch->ch_w_head - ch->ch_w_tail) & WQUEUEMASK; | |
2746 | ||
9b33f918 FA |
2747 | /* |
2748 | * Is the UART empty? | |
2749 | * Add that value to whats in our TX queue. | |
2750 | */ | |
7127fa28 | 2751 | |
8670a56f | 2752 | count = buf.txbuf + ch_bd_ops->get_uart_bytes_left(ch); |
0b99d589 LL |
2753 | |
2754 | /* | |
2755 | * Figure out how much data the RealPort Server believes should | |
2756 | * be in our TX queue. | |
2757 | */ | |
b9f84637 | 2758 | tdist = (buf.tx_in - buf.tx_out) & 0xffff; |
0b99d589 LL |
2759 | |
2760 | /* | |
2761 | * If we have more data than the RealPort Server believes we | |
2762 | * should have, reduce our count to its amount. | |
2763 | * | |
2764 | * This count difference CAN happen because the Linux LD can | |
2765 | * insert more characters into our queue for OPOST processing | |
2766 | * that the RealPort Server doesn't know about. | |
2767 | */ | |
50667c67 | 2768 | if (buf.txbuf > tdist) |
0b99d589 | 2769 | buf.txbuf = tdist; |
0b99d589 | 2770 | |
7127fa28 WF |
2771 | /* Report whether our queue and UART TX are completely empty. */ |
2772 | ||
50667c67 | 2773 | if (count) |
0b99d589 | 2774 | buf.txdone = 0; |
50667c67 | 2775 | else |
0b99d589 | 2776 | buf.txdone = 1; |
0b99d589 | 2777 | |
a44b508a | 2778 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2779 | |
50667c67 | 2780 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2781 | return -EFAULT; |
50667c67 | 2782 | |
8f90ef80 | 2783 | return 0; |
0b99d589 LL |
2784 | } |
2785 | default: | |
a44b508a | 2786 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2787 | |
8f90ef80 | 2788 | return -ENOIOCTLCMD; |
0b99d589 | 2789 | } |
0b99d589 | 2790 | } |