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 | ||
16 | /************************************************************************ | |
8b07d521 | 17 | * |
0b99d589 LL |
18 | * This file implements the tty driver functionality for the |
19 | * Neo and ClassicBoard PCI based product lines. | |
8b07d521 | 20 | * |
0b99d589 LL |
21 | ************************************************************************ |
22 | * | |
0b99d589 LL |
23 | */ |
24 | ||
25 | #include <linux/kernel.h> | |
0b99d589 LL |
26 | #include <linux/sched.h> /* For jiffies, task states */ |
27 | #include <linux/interrupt.h> /* For tasklet and interrupt structs/defines */ | |
28 | #include <linux/module.h> | |
29 | #include <linux/ctype.h> | |
30 | #include <linux/tty.h> | |
31 | #include <linux/tty_flip.h> | |
d533a524 | 32 | #include <linux/types.h> |
0b99d589 LL |
33 | #include <linux/serial_reg.h> |
34 | #include <linux/slab.h> | |
90d2a471 | 35 | #include <linux/delay.h> /* For udelay */ |
fb33cac8 | 36 | #include <linux/uaccess.h> /* For copy_from_user/copy_to_user */ |
0b99d589 | 37 | #include <linux/pci.h> |
0b99d589 LL |
38 | #include "dgnc_driver.h" |
39 | #include "dgnc_tty.h" | |
0b99d589 LL |
40 | #include "dgnc_neo.h" |
41 | #include "dgnc_cls.h" | |
0b99d589 | 42 | #include "dgnc_sysfs.h" |
9a633d00 | 43 | #include "dgnc_utils.h" |
0b99d589 | 44 | |
0b99d589 LL |
45 | /* |
46 | * internal variables | |
47 | */ | |
03425f55 | 48 | static struct dgnc_board *dgnc_BoardsByMajor[256]; |
446393e9 | 49 | static unsigned char *dgnc_TmpWriteBuf; |
0b99d589 LL |
50 | |
51 | /* | |
52 | * Default transparent print information. | |
53 | */ | |
54 | static struct digi_t dgnc_digi_init = { | |
55 | .digi_flags = DIGI_COOK, /* Flags */ | |
56 | .digi_maxcps = 100, /* Max CPS */ | |
57 | .digi_maxchar = 50, /* Max chars in print queue */ | |
58 | .digi_bufsize = 100, /* Printer buffer size */ | |
59 | .digi_onlen = 4, /* size of printer on string */ | |
60 | .digi_offlen = 4, /* size of printer off string */ | |
61 | .digi_onstr = "\033[5i", /* ANSI printer on string ] */ | |
62 | .digi_offstr = "\033[4i", /* ANSI printer off string ] */ | |
63 | .digi_term = "ansi" /* default terminal type */ | |
64 | }; | |
65 | ||
0b99d589 LL |
66 | /* |
67 | * Define a local default termios struct. All ports will be created | |
68 | * with this termios initially. | |
69 | * | |
70 | * This defines a raw port at 9600 baud, 8 data bits, no parity, | |
71 | * 1 stop bit. | |
72 | */ | |
10352c2a | 73 | static struct ktermios DgncDefaultTermios = { |
0b99d589 LL |
74 | .c_iflag = (DEFAULT_IFLAGS), /* iflags */ |
75 | .c_oflag = (DEFAULT_OFLAGS), /* oflags */ | |
76 | .c_cflag = (DEFAULT_CFLAGS), /* cflags */ | |
77 | .c_lflag = (DEFAULT_LFLAGS), /* lflags */ | |
78 | .c_cc = INIT_C_CC, | |
79 | .c_line = 0, | |
80 | }; | |
81 | ||
0b99d589 LL |
82 | /* Our function prototypes */ |
83 | static int dgnc_tty_open(struct tty_struct *tty, struct file *file); | |
84 | static void dgnc_tty_close(struct tty_struct *tty, struct file *file); | |
851f306d CM |
85 | static int dgnc_block_til_ready(struct tty_struct *tty, struct file *file, |
86 | struct channel_t *ch); | |
87 | static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, | |
88 | unsigned long arg); | |
89 | static int dgnc_tty_digigeta(struct tty_struct *tty, | |
90 | struct digi_t __user *retinfo); | |
91 | static int dgnc_tty_digiseta(struct tty_struct *tty, | |
92 | struct digi_t __user *new_info); | |
58b905b3 | 93 | static int dgnc_tty_write_room(struct tty_struct *tty); |
0b99d589 | 94 | static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c); |
58b905b3 | 95 | static int dgnc_tty_chars_in_buffer(struct tty_struct *tty); |
0b99d589 LL |
96 | static void dgnc_tty_start(struct tty_struct *tty); |
97 | static void dgnc_tty_stop(struct tty_struct *tty); | |
98 | static void dgnc_tty_throttle(struct tty_struct *tty); | |
99 | static void dgnc_tty_unthrottle(struct tty_struct *tty); | |
100 | static void dgnc_tty_flush_chars(struct tty_struct *tty); | |
101 | static void dgnc_tty_flush_buffer(struct tty_struct *tty); | |
102 | static void dgnc_tty_hangup(struct tty_struct *tty); | |
c23b48e0 | 103 | static int dgnc_set_modem_info(struct channel_t *ch, unsigned int command, |
851f306d CM |
104 | unsigned int __user *value); |
105 | static int dgnc_get_modem_info(struct channel_t *ch, | |
106 | unsigned int __user *value); | |
0b99d589 | 107 | static int dgnc_tty_tiocmget(struct tty_struct *tty); |
851f306d CM |
108 | static int dgnc_tty_tiocmset(struct tty_struct *tty, unsigned int set, |
109 | unsigned int clear); | |
0b99d589 LL |
110 | static int dgnc_tty_send_break(struct tty_struct *tty, int msec); |
111 | static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout); | |
851f306d CM |
112 | static int dgnc_tty_write(struct tty_struct *tty, const unsigned char *buf, |
113 | int count); | |
114 | static void dgnc_tty_set_termios(struct tty_struct *tty, | |
115 | struct ktermios *old_termios); | |
0b99d589 LL |
116 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char ch); |
117 | ||
0b99d589 LL |
118 | static const struct tty_operations dgnc_tty_ops = { |
119 | .open = dgnc_tty_open, | |
120 | .close = dgnc_tty_close, | |
121 | .write = dgnc_tty_write, | |
122 | .write_room = dgnc_tty_write_room, | |
123 | .flush_buffer = dgnc_tty_flush_buffer, | |
124 | .chars_in_buffer = dgnc_tty_chars_in_buffer, | |
125 | .flush_chars = dgnc_tty_flush_chars, | |
126 | .ioctl = dgnc_tty_ioctl, | |
127 | .set_termios = dgnc_tty_set_termios, | |
128 | .stop = dgnc_tty_stop, | |
129 | .start = dgnc_tty_start, | |
130 | .throttle = dgnc_tty_throttle, | |
131 | .unthrottle = dgnc_tty_unthrottle, | |
132 | .hangup = dgnc_tty_hangup, | |
133 | .put_char = dgnc_tty_put_char, | |
134 | .tiocmget = dgnc_tty_tiocmget, | |
135 | .tiocmset = dgnc_tty_tiocmset, | |
136 | .break_ctl = dgnc_tty_send_break, | |
137 | .wait_until_sent = dgnc_tty_wait_until_sent, | |
138 | .send_xchar = dgnc_tty_send_xchar | |
139 | }; | |
140 | ||
141 | /************************************************************************ | |
8b07d521 | 142 | * |
0b99d589 | 143 | * TTY Initialization/Cleanup Functions |
8b07d521 | 144 | * |
0b99d589 | 145 | ************************************************************************/ |
8b07d521 | 146 | |
0b99d589 LL |
147 | /* |
148 | * dgnc_tty_preinit() | |
149 | * | |
150 | * Initialize any global tty related data before we download any boards. | |
151 | */ | |
152 | int dgnc_tty_preinit(void) | |
153 | { | |
154 | /* | |
155 | * Allocate a buffer for doing the copy from user space to | |
156 | * kernel space in dgnc_write(). We only use one buffer and | |
157 | * control access to it with a semaphore. If we are paging, we | |
158 | * are already in trouble so one buffer won't hurt much anyway. | |
159 | * | |
160 | * We are okay to sleep in the malloc, as this routine | |
161 | * is only called during module load, (not in interrupt context), | |
162 | * and with no locks held. | |
163 | */ | |
164 | dgnc_TmpWriteBuf = kmalloc(WRITEBUFLEN, GFP_KERNEL); | |
165 | ||
f1e51745 | 166 | if (!dgnc_TmpWriteBuf) |
8f90ef80 | 167 | return -ENOMEM; |
0b99d589 | 168 | |
8f90ef80 | 169 | return 0; |
0b99d589 LL |
170 | } |
171 | ||
0b99d589 LL |
172 | /* |
173 | * dgnc_tty_register() | |
174 | * | |
175 | * Init the tty subsystem for this board. | |
176 | */ | |
03425f55 | 177 | int dgnc_tty_register(struct dgnc_board *brd) |
0b99d589 | 178 | { |
60b3109e | 179 | int rc; |
8b07d521 | 180 | |
60b3109e DY |
181 | brd->serial_driver = tty_alloc_driver(brd->maxports, |
182 | TTY_DRIVER_REAL_RAW | | |
183 | TTY_DRIVER_DYNAMIC_DEV | | |
184 | TTY_DRIVER_HARDWARE_BREAK); | |
0b99d589 | 185 | |
60b3109e DY |
186 | if (IS_ERR(brd->serial_driver)) |
187 | return PTR_ERR(brd->serial_driver); | |
0b99d589 | 188 | |
60b3109e | 189 | snprintf(brd->serial_name, MAXTTYNAMELEN, "tty_dgnc_%d_", brd->boardnum); |
0b99d589 | 190 | |
60b3109e DY |
191 | brd->serial_driver->name = brd->serial_name; |
192 | brd->serial_driver->name_base = 0; | |
193 | brd->serial_driver->major = 0; | |
194 | brd->serial_driver->minor_start = 0; | |
195 | brd->serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
196 | brd->serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
197 | brd->serial_driver->init_termios = DgncDefaultTermios; | |
198 | brd->serial_driver->driver_name = DRVSTR; | |
0b99d589 | 199 | |
0b99d589 LL |
200 | /* |
201 | * Entry points for driver. Called by the kernel from | |
202 | * tty_io.c and n_tty.c. | |
203 | */ | |
60b3109e | 204 | tty_set_operations(brd->serial_driver, &dgnc_tty_ops); |
0b99d589 | 205 | |
a25ad520 | 206 | if (!brd->dgnc_major_serial_registered) { |
0b99d589 | 207 | /* Register tty devices */ |
60b3109e | 208 | rc = tty_register_driver(brd->serial_driver); |
0b99d589 | 209 | if (rc < 0) { |
1f26adc9 RD |
210 | dev_dbg(&brd->pdev->dev, |
211 | "Can't register tty device (%d)\n", rc); | |
60b3109e | 212 | goto free_serial_driver; |
0b99d589 | 213 | } |
a25ad520 | 214 | brd->dgnc_major_serial_registered = true; |
0b99d589 LL |
215 | } |
216 | ||
217 | /* | |
218 | * If we're doing transparent print, we have to do all of the above | |
79e30af2 | 219 | * again, separately so we don't get the LD confused about what major |
0b99d589 LL |
220 | * we are when we get into the dgnc_tty_open() routine. |
221 | */ | |
60b3109e DY |
222 | brd->print_driver = tty_alloc_driver(brd->maxports, |
223 | TTY_DRIVER_REAL_RAW | | |
224 | TTY_DRIVER_DYNAMIC_DEV | | |
225 | TTY_DRIVER_HARDWARE_BREAK); | |
0b99d589 | 226 | |
a0ca97b8 DY |
227 | if (IS_ERR(brd->print_driver)) { |
228 | rc = PTR_ERR(brd->print_driver); | |
229 | goto unregister_serial_driver; | |
230 | } | |
0b99d589 | 231 | |
60b3109e | 232 | snprintf(brd->print_name, MAXTTYNAMELEN, "pr_dgnc_%d_", brd->boardnum); |
0b99d589 | 233 | |
60b3109e DY |
234 | brd->print_driver->name = brd->print_name; |
235 | brd->print_driver->name_base = 0; | |
236 | brd->print_driver->major = brd->serial_driver->major; | |
237 | brd->print_driver->minor_start = 0x80; | |
238 | brd->print_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
239 | brd->print_driver->subtype = SERIAL_TYPE_NORMAL; | |
240 | brd->print_driver->init_termios = DgncDefaultTermios; | |
241 | brd->print_driver->driver_name = DRVSTR; | |
0b99d589 | 242 | |
0b99d589 LL |
243 | /* |
244 | * Entry points for driver. Called by the kernel from | |
245 | * tty_io.c and n_tty.c. | |
246 | */ | |
60b3109e | 247 | tty_set_operations(brd->print_driver, &dgnc_tty_ops); |
0b99d589 | 248 | |
a25ad520 | 249 | if (!brd->dgnc_major_transparent_print_registered) { |
0b99d589 | 250 | /* Register Transparent Print devices */ |
60b3109e | 251 | rc = tty_register_driver(brd->print_driver); |
0b99d589 | 252 | if (rc < 0) { |
1f26adc9 RD |
253 | dev_dbg(&brd->pdev->dev, |
254 | "Can't register Transparent Print device(%d)\n", | |
255 | rc); | |
60b3109e | 256 | goto free_print_driver; |
0b99d589 | 257 | } |
a25ad520 | 258 | brd->dgnc_major_transparent_print_registered = true; |
0b99d589 LL |
259 | } |
260 | ||
60b3109e DY |
261 | dgnc_BoardsByMajor[brd->serial_driver->major] = brd; |
262 | ||
263 | return 0; | |
264 | ||
265 | free_print_driver: | |
266 | put_tty_driver(brd->print_driver); | |
267 | unregister_serial_driver: | |
268 | tty_unregister_driver(brd->serial_driver); | |
269 | free_serial_driver: | |
270 | put_tty_driver(brd->serial_driver); | |
0b99d589 | 271 | |
8f90ef80 | 272 | return rc; |
0b99d589 LL |
273 | } |
274 | ||
0b99d589 LL |
275 | /* |
276 | * dgnc_tty_init() | |
277 | * | |
278 | * Init the tty subsystem. Called once per board after board has been | |
279 | * downloaded and init'ed. | |
280 | */ | |
03425f55 | 281 | int dgnc_tty_init(struct dgnc_board *brd) |
0b99d589 LL |
282 | { |
283 | int i; | |
a7a75386 | 284 | void __iomem *vaddr; |
0b99d589 LL |
285 | struct channel_t *ch; |
286 | ||
287 | if (!brd) | |
8f90ef80 | 288 | return -ENXIO; |
0b99d589 | 289 | |
0b99d589 LL |
290 | /* |
291 | * Initialize board structure elements. | |
292 | */ | |
293 | ||
294 | vaddr = brd->re_map_membase; | |
295 | ||
296 | brd->nasync = brd->maxports; | |
297 | ||
0b99d589 | 298 | for (i = 0; i < brd->nasync; i++) { |
fa52d96c GS |
299 | /* |
300 | * Okay to malloc with GFP_KERNEL, we are not at | |
301 | * interrupt context, and there are no locks held. | |
302 | */ | |
303 | brd->channels[i] = kzalloc(sizeof(*brd->channels[i]), | |
304 | GFP_KERNEL); | |
305 | if (!brd->channels[i]) | |
306 | goto err_free_channels; | |
0b99d589 LL |
307 | } |
308 | ||
309 | ch = brd->channels[0]; | |
310 | vaddr = brd->re_map_membase; | |
311 | ||
312 | /* Set up channel variables */ | |
313 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
a44b508a | 314 | spin_lock_init(&ch->ch_lock); |
0b99d589 LL |
315 | |
316 | /* Store all our magic numbers */ | |
317 | ch->magic = DGNC_CHANNEL_MAGIC; | |
318 | ch->ch_tun.magic = DGNC_UNIT_MAGIC; | |
319 | ch->ch_tun.un_ch = ch; | |
320 | ch->ch_tun.un_type = DGNC_SERIAL; | |
321 | ch->ch_tun.un_dev = i; | |
322 | ||
323 | ch->ch_pun.magic = DGNC_UNIT_MAGIC; | |
324 | ch->ch_pun.un_ch = ch; | |
325 | ch->ch_pun.un_type = DGNC_PRINT; | |
326 | ch->ch_pun.un_dev = i + 128; | |
327 | ||
328 | if (brd->bd_uart_offset == 0x200) | |
a7a75386 | 329 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 | 330 | else |
a7a75386 | 331 | ch->ch_cls_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 LL |
332 | |
333 | ch->ch_bd = brd; | |
334 | ch->ch_portnum = i; | |
335 | ch->ch_digi = dgnc_digi_init; | |
336 | ||
337 | /* .25 second delay */ | |
338 | ch->ch_close_delay = 250; | |
339 | ||
340 | init_waitqueue_head(&ch->ch_flags_wait); | |
341 | init_waitqueue_head(&ch->ch_tun.un_flags_wait); | |
342 | init_waitqueue_head(&ch->ch_pun.un_flags_wait); | |
0b99d589 LL |
343 | |
344 | { | |
345 | struct device *classp; | |
0eaa02e6 | 346 | |
60b3109e | 347 | classp = tty_register_device(brd->serial_driver, i, |
7df227c4 | 348 | &ch->ch_bd->pdev->dev); |
0b99d589 LL |
349 | ch->ch_tun.un_sysfs = classp; |
350 | dgnc_create_tty_sysfs(&ch->ch_tun, classp); | |
351 | ||
60b3109e | 352 | classp = tty_register_device(brd->print_driver, i, |
7df227c4 | 353 | &ch->ch_bd->pdev->dev); |
0b99d589 LL |
354 | ch->ch_pun.un_sysfs = classp; |
355 | dgnc_create_tty_sysfs(&ch->ch_pun, classp); | |
356 | } | |
0b99d589 LL |
357 | } |
358 | ||
8f90ef80 | 359 | return 0; |
fa52d96c GS |
360 | |
361 | err_free_channels: | |
362 | for (i = i - 1; i >= 0; --i) { | |
363 | kfree(brd->channels[i]); | |
364 | brd->channels[i] = NULL; | |
365 | } | |
366 | return -ENOMEM; | |
0b99d589 LL |
367 | } |
368 | ||
0b99d589 LL |
369 | /* |
370 | * dgnc_tty_post_uninit() | |
371 | * | |
372 | * UnInitialize any global tty related data. | |
373 | */ | |
374 | void dgnc_tty_post_uninit(void) | |
375 | { | |
5b4af85e DY |
376 | kfree(dgnc_TmpWriteBuf); |
377 | dgnc_TmpWriteBuf = NULL; | |
0b99d589 LL |
378 | } |
379 | ||
0b99d589 LL |
380 | /* |
381 | * dgnc_tty_uninit() | |
382 | * | |
383 | * Uninitialize the TTY portion of this driver. Free all memory and | |
8b07d521 | 384 | * resources. |
0b99d589 | 385 | */ |
03425f55 | 386 | void dgnc_tty_uninit(struct dgnc_board *brd) |
0b99d589 LL |
387 | { |
388 | int i = 0; | |
389 | ||
a25ad520 | 390 | if (brd->dgnc_major_serial_registered) { |
60b3109e | 391 | dgnc_BoardsByMajor[brd->serial_driver->major] = NULL; |
0b99d589 | 392 | for (i = 0; i < brd->nasync; i++) { |
ce2927e9 GS |
393 | if (brd->channels[i]) |
394 | dgnc_remove_tty_sysfs(brd->channels[i]-> | |
395 | ch_tun.un_sysfs); | |
60b3109e | 396 | tty_unregister_device(brd->serial_driver, i); |
0b99d589 | 397 | } |
60b3109e | 398 | tty_unregister_driver(brd->serial_driver); |
a25ad520 | 399 | brd->dgnc_major_serial_registered = false; |
0b99d589 LL |
400 | } |
401 | ||
a25ad520 | 402 | if (brd->dgnc_major_transparent_print_registered) { |
60b3109e | 403 | dgnc_BoardsByMajor[brd->print_driver->major] = NULL; |
0b99d589 | 404 | for (i = 0; i < brd->nasync; i++) { |
ce2927e9 GS |
405 | if (brd->channels[i]) |
406 | dgnc_remove_tty_sysfs(brd->channels[i]-> | |
407 | ch_pun.un_sysfs); | |
60b3109e | 408 | tty_unregister_device(brd->print_driver, i); |
0b99d589 | 409 | } |
60b3109e | 410 | tty_unregister_driver(brd->print_driver); |
a25ad520 | 411 | brd->dgnc_major_transparent_print_registered = false; |
0b99d589 LL |
412 | } |
413 | ||
60b3109e DY |
414 | put_tty_driver(brd->serial_driver); |
415 | put_tty_driver(brd->print_driver); | |
0b99d589 LL |
416 | } |
417 | ||
8e8d27f7 | 418 | /* |
0b99d589 LL |
419 | * dgnc_wmove - Write data to transmit queue. |
420 | * | |
421 | * ch - Pointer to channel structure. | |
f7f2b10a | 422 | * buf - Pointer to characters to be moved. |
0b99d589 | 423 | * n - Number of characters to move. |
8e8d27f7 | 424 | */ |
0b99d589 LL |
425 | static void dgnc_wmove(struct channel_t *ch, char *buf, uint n) |
426 | { | |
427 | int remain; | |
428 | uint head; | |
429 | ||
430 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
431 | return; | |
8b07d521 | 432 | |
0b99d589 LL |
433 | head = ch->ch_w_head & WQUEUEMASK; |
434 | ||
435 | /* | |
436 | * If the write wraps over the top of the circular buffer, | |
437 | * move the portion up to the wrap point, and reset the | |
438 | * pointers to the bottom. | |
439 | */ | |
440 | remain = WQUEUESIZE - head; | |
441 | ||
442 | if (n >= remain) { | |
8b07d521 | 443 | n -= remain; |
0b99d589 LL |
444 | memcpy(ch->ch_wqueue + head, buf, remain); |
445 | head = 0; | |
446 | buf += remain; | |
447 | } | |
448 | ||
449 | if (n > 0) { | |
450 | /* | |
451 | * Move rest of data. | |
452 | */ | |
453 | remain = n; | |
454 | memcpy(ch->ch_wqueue + head, buf, remain); | |
455 | head += remain; | |
456 | } | |
457 | ||
458 | head &= WQUEUEMASK; | |
459 | ch->ch_w_head = head; | |
460 | } | |
461 | ||
8e8d27f7 | 462 | /* |
0b99d589 | 463 | * dgnc_input - Process received data. |
8b07d521 | 464 | * |
90d2a471 | 465 | * ch - Pointer to channel structure. |
8e8d27f7 | 466 | */ |
0b99d589 LL |
467 | void dgnc_input(struct channel_t *ch) |
468 | { | |
03425f55 | 469 | struct dgnc_board *bd; |
0b99d589 | 470 | struct tty_struct *tp; |
c84a083b | 471 | struct tty_ldisc *ld = NULL; |
0b99d589 LL |
472 | uint rmask; |
473 | ushort head; | |
474 | ushort tail; | |
475 | int data_len; | |
a44b508a | 476 | unsigned long flags; |
0b99d589 LL |
477 | int flip_len; |
478 | int len = 0; | |
479 | int n = 0; | |
0b99d589 LL |
480 | int s = 0; |
481 | int i = 0; | |
482 | ||
483 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
484 | return; | |
485 | ||
486 | tp = ch->ch_tun.un_tty; | |
487 | ||
488 | bd = ch->ch_bd; | |
a82477c3 | 489 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
0b99d589 LL |
490 | return; |
491 | ||
a44b508a | 492 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 493 | |
8b07d521 LL |
494 | /* |
495 | * Figure the number of characters in the buffer. | |
0b99d589 LL |
496 | * Exit immediately if none. |
497 | */ | |
498 | rmask = RQUEUEMASK; | |
499 | head = ch->ch_r_head & rmask; | |
500 | tail = ch->ch_r_tail & rmask; | |
501 | data_len = (head - tail) & rmask; | |
502 | ||
c84a083b QL |
503 | if (data_len == 0) |
504 | goto exit_unlock; | |
0b99d589 | 505 | |
0b99d589 LL |
506 | /* |
507 | * If the device is not open, or CREAD is off, | |
90d2a471 | 508 | * flush input data and return immediately. |
0b99d589 | 509 | */ |
851f306d CM |
510 | if (!tp || (tp->magic != TTY_MAGIC) || |
511 | !(ch->ch_tun.un_flags & UN_ISOPEN) || | |
9db276f8 | 512 | !C_CREAD(tp) || |
851f306d | 513 | (ch->ch_tun.un_flags & UN_CLOSING)) { |
0b99d589 LL |
514 | ch->ch_r_head = tail; |
515 | ||
516 | /* Force queue flow control to be released, if needed */ | |
517 | dgnc_check_queue_flow_control(ch); | |
518 | ||
c84a083b | 519 | goto exit_unlock; |
0b99d589 LL |
520 | } |
521 | ||
522 | /* | |
523 | * If we are throttled, simply don't read any data. | |
524 | */ | |
c84a083b QL |
525 | if (ch->ch_flags & CH_FORCED_STOPI) |
526 | goto exit_unlock; | |
0b99d589 | 527 | |
100013fa | 528 | flip_len = TTY_FLIPBUF_SIZE; |
0b99d589 LL |
529 | |
530 | /* Chop down the length, if needed */ | |
531 | len = min(data_len, flip_len); | |
100013fa | 532 | len = min(len, (N_TTY_BUF_SIZE - 1)); |
0b99d589 LL |
533 | |
534 | ld = tty_ldisc_ref(tp); | |
535 | ||
0b99d589 LL |
536 | /* |
537 | * If we were unable to get a reference to the ld, | |
538 | * don't flush our buffer, and act like the ld doesn't | |
539 | * have any space to put the data right now. | |
540 | */ | |
541 | if (!ld) { | |
542 | len = 0; | |
543 | } else { | |
544 | /* | |
545 | * If ld doesn't have a pointer to a receive_buf function, | |
546 | * flush the data, then act like the ld doesn't have any | |
547 | * space to put the data right now. | |
548 | */ | |
549 | if (!ld->ops->receive_buf) { | |
550 | ch->ch_r_head = ch->ch_r_tail; | |
551 | len = 0; | |
8b07d521 | 552 | } |
0b99d589 LL |
553 | } |
554 | ||
c84a083b QL |
555 | if (len <= 0) |
556 | goto exit_unlock; | |
0b99d589 LL |
557 | |
558 | /* | |
559 | * The tty layer in the kernel has changed in 2.6.16+. | |
560 | * | |
561 | * The flip buffers in the tty structure are no longer exposed, | |
562 | * and probably will be going away eventually. | |
8b07d521 | 563 | * |
0b99d589 LL |
564 | * If we are completely raw, we don't need to go through a lot |
565 | * of the tty layers that exist. | |
566 | * In this case, we take the shortest and fastest route we | |
567 | * can to relay the data to the user. | |
568 | * | |
569 | * On the other hand, if we are not raw, we need to go through | |
570 | * the new 2.6.16+ tty layer, which has its API more well defined. | |
571 | */ | |
100013fa LL |
572 | len = tty_buffer_request_room(tp->port, len); |
573 | n = len; | |
0b99d589 | 574 | |
100013fa LL |
575 | /* |
576 | * n now contains the most amount of data we can copy, | |
577 | * bounded either by how much the Linux tty layer can handle, | |
578 | * or the amount of data the card actually has pending... | |
579 | */ | |
580 | while (n) { | |
56d118c2 DY |
581 | unsigned char *ch_pos = ch->ch_equeue + tail; |
582 | ||
100013fa LL |
583 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; |
584 | s = min(s, n); | |
0b99d589 | 585 | |
100013fa LL |
586 | if (s <= 0) |
587 | break; | |
0b99d589 LL |
588 | |
589 | /* | |
8b07d521 | 590 | * If conditions are such that ld needs to see all |
100013fa LL |
591 | * UART errors, we will have to walk each character |
592 | * and error byte and send them to the buffer one at | |
593 | * a time. | |
0b99d589 | 594 | */ |
100013fa LL |
595 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
596 | for (i = 0; i < s; i++) { | |
56d118c2 DY |
597 | unsigned char ch = *(ch_pos + i); |
598 | char flag = TTY_NORMAL; | |
599 | ||
600 | if (ch & UART_LSR_BI) | |
601 | flag = TTY_BREAK; | |
602 | else if (ch & UART_LSR_PE) | |
603 | flag = TTY_PARITY; | |
604 | else if (ch & UART_LSR_FE) | |
605 | flag = TTY_FRAME; | |
606 | ||
607 | tty_insert_flip_char(tp->port, ch, flag); | |
100013fa | 608 | } |
2000c581 | 609 | } else { |
56d118c2 | 610 | tty_insert_flip_string(tp->port, ch_pos, s); |
0b99d589 LL |
611 | } |
612 | ||
100013fa LL |
613 | tail += s; |
614 | n -= s; | |
615 | /* Flip queue if needed */ | |
616 | tail &= rmask; | |
0b99d589 | 617 | } |
0b99d589 | 618 | |
100013fa LL |
619 | ch->ch_r_tail = tail & rmask; |
620 | ch->ch_e_tail = tail & rmask; | |
621 | dgnc_check_queue_flow_control(ch); | |
a44b508a | 622 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 623 | |
100013fa LL |
624 | /* Tell the tty layer its okay to "eat" the data now */ |
625 | tty_flip_buffer_push(tp->port); | |
0b99d589 LL |
626 | |
627 | if (ld) | |
628 | tty_ldisc_deref(ld); | |
c84a083b QL |
629 | return; |
630 | ||
631 | exit_unlock: | |
5ec29365 | 632 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
c84a083b QL |
633 | if (ld) |
634 | tty_ldisc_deref(ld); | |
0b99d589 LL |
635 | } |
636 | ||
8b07d521 | 637 | /************************************************************************ |
0b99d589 | 638 | * Determines when CARRIER changes state and takes appropriate |
8b07d521 | 639 | * action. |
0b99d589 LL |
640 | ************************************************************************/ |
641 | void dgnc_carrier(struct channel_t *ch) | |
642 | { | |
90d2a471 LL |
643 | int virt_carrier = 0; |
644 | int phys_carrier = 0; | |
8b07d521 | 645 | |
0b99d589 LL |
646 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
647 | return; | |
648 | ||
f1e51745 | 649 | if (ch->ch_mistat & UART_MSR_DCD) |
0b99d589 | 650 | phys_carrier = 1; |
0b99d589 | 651 | |
50667c67 | 652 | if (ch->ch_digi.digi_flags & DIGI_FORCEDCD) |
0b99d589 | 653 | virt_carrier = 1; |
0b99d589 | 654 | |
50667c67 | 655 | if (ch->ch_c_cflag & CLOCAL) |
0b99d589 | 656 | virt_carrier = 1; |
0b99d589 | 657 | |
0b99d589 LL |
658 | /* |
659 | * Test for a VIRTUAL carrier transition to HIGH. | |
660 | */ | |
661 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
0b99d589 LL |
662 | /* |
663 | * When carrier rises, wake any threads waiting | |
664 | * for carrier in the open routine. | |
665 | */ | |
666 | ||
7df227c4 | 667 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
668 | wake_up_interruptible(&ch->ch_flags_wait); |
669 | } | |
670 | ||
671 | /* | |
672 | * Test for a PHYSICAL carrier transition to HIGH. | |
673 | */ | |
674 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
0b99d589 LL |
675 | /* |
676 | * When carrier rises, wake any threads waiting | |
677 | * for carrier in the open routine. | |
678 | */ | |
679 | ||
7df227c4 | 680 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
681 | wake_up_interruptible(&ch->ch_flags_wait); |
682 | } | |
683 | ||
684 | /* | |
685 | * Test for a PHYSICAL transition to low, so long as we aren't | |
686 | * currently ignoring physical transitions (which is what "virtual | |
687 | * carrier" indicates). | |
688 | * | |
689 | * The transition of the virtual carrier to low really doesn't | |
690 | * matter... it really only means "ignore carrier state", not | |
691 | * "make pretend that carrier is there". | |
692 | */ | |
693 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) && | |
10352c2a | 694 | (phys_carrier == 0)) { |
0b99d589 LL |
695 | /* |
696 | * When carrier drops: | |
697 | * | |
698 | * Drop carrier on all open units. | |
699 | * | |
700 | * Flush queues, waking up any task waiting in the | |
701 | * line discipline. | |
702 | * | |
703 | * Send a hangup to the control terminal. | |
704 | * | |
705 | * Enable all select calls. | |
706 | */ | |
7df227c4 | 707 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
708 | wake_up_interruptible(&ch->ch_flags_wait); |
709 | ||
f1e51745 | 710 | if (ch->ch_tun.un_open_count > 0) |
0b99d589 | 711 | tty_hangup(ch->ch_tun.un_tty); |
0b99d589 | 712 | |
f1e51745 | 713 | if (ch->ch_pun.un_open_count > 0) |
0b99d589 | 714 | tty_hangup(ch->ch_pun.un_tty); |
0b99d589 LL |
715 | } |
716 | ||
717 | /* | |
718 | * Make sure that our cached values reflect the current reality. | |
719 | */ | |
720 | if (virt_carrier == 1) | |
721 | ch->ch_flags |= CH_FCAR; | |
8b07d521 | 722 | else |
0b99d589 LL |
723 | ch->ch_flags &= ~CH_FCAR; |
724 | ||
725 | if (phys_carrier == 1) | |
726 | ch->ch_flags |= CH_CD; | |
727 | else | |
728 | ch->ch_flags &= ~CH_CD; | |
729 | } | |
730 | ||
731 | /* | |
732 | * Assign the custom baud rate to the channel structure | |
733 | */ | |
734 | static void dgnc_set_custom_speed(struct channel_t *ch, uint newrate) | |
735 | { | |
736 | int testdiv; | |
737 | int testrate_high; | |
8b07d521 | 738 | int testrate_low; |
0b99d589 LL |
739 | int deltahigh; |
740 | int deltalow; | |
741 | ||
93c76c9c DY |
742 | if (newrate <= 0) { |
743 | ch->ch_custom_speed = 0; | |
744 | return; | |
745 | } | |
0b99d589 LL |
746 | |
747 | /* | |
748 | * Since the divisor is stored in a 16-bit integer, we make sure | |
749 | * we don't allow any rates smaller than a 16-bit integer would allow. | |
750 | * And of course, rates above the dividend won't fly. | |
751 | */ | |
752 | if (newrate && newrate < ((ch->ch_bd->bd_dividend / 0xFFFF) + 1)) | |
0b7ceaa6 | 753 | newrate = (ch->ch_bd->bd_dividend / 0xFFFF) + 1; |
0b99d589 LL |
754 | |
755 | if (newrate && newrate > ch->ch_bd->bd_dividend) | |
90d2a471 | 756 | newrate = ch->ch_bd->bd_dividend; |
0b99d589 | 757 | |
93c76c9c | 758 | if (newrate > 0) { |
0b99d589 LL |
759 | testdiv = ch->ch_bd->bd_dividend / newrate; |
760 | ||
761 | /* | |
762 | * If we try to figure out what rate the board would use | |
763 | * with the test divisor, it will be either equal or higher | |
764 | * than the requested baud rate. If we then determine the | |
8b07d521 | 765 | * rate with a divisor one higher, we will get the next lower |
0b99d589 LL |
766 | * supported rate below the requested. |
767 | */ | |
768 | testrate_high = ch->ch_bd->bd_dividend / testdiv; | |
769 | testrate_low = ch->ch_bd->bd_dividend / (testdiv + 1); | |
770 | ||
771 | /* | |
772 | * If the rate for the requested divisor is correct, just | |
773 | * use it and be done. | |
774 | */ | |
93c76c9c DY |
775 | if (testrate_high != newrate) { |
776 | /* | |
851f306d CM |
777 | * Otherwise, pick the rate that is closer |
778 | * (i.e. whichever rate has a smaller delta). | |
93c76c9c DY |
779 | */ |
780 | deltahigh = testrate_high - newrate; | |
781 | deltalow = newrate - testrate_low; | |
0b99d589 | 782 | |
50667c67 | 783 | if (deltahigh < deltalow) |
93c76c9c | 784 | newrate = testrate_high; |
50667c67 | 785 | else |
93c76c9c | 786 | newrate = testrate_low; |
0b99d589 | 787 | } |
0b99d589 | 788 | } |
8b07d521 | 789 | |
0b99d589 | 790 | ch->ch_custom_speed = newrate; |
0b99d589 LL |
791 | } |
792 | ||
0b99d589 LL |
793 | void dgnc_check_queue_flow_control(struct channel_t *ch) |
794 | { | |
d09c1b96 | 795 | int qleft; |
0b99d589 LL |
796 | |
797 | /* Store how much space we have left in the queue */ | |
f7c851d4 CP |
798 | qleft = ch->ch_r_tail - ch->ch_r_head - 1; |
799 | if (qleft < 0) | |
0b99d589 LL |
800 | qleft += RQUEUEMASK + 1; |
801 | ||
802 | /* | |
803 | * Check to see if we should enforce flow control on our queue because | |
804 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
805 | * | |
806 | * NOTE: This is done based on what the current flow control of the | |
807 | * port is set for. | |
808 | * | |
809 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
810 | * This will cause the UART's FIFO to back up, and force | |
811 | * the RTS signal to be dropped. | |
812 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
813 | * the other side, in hopes it will stop sending data to us. | |
814 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
815 | * that gets sent into us when the queue fills up. | |
816 | */ | |
817 | if (qleft < 256) { | |
818 | /* HWFLOW */ | |
851f306d CM |
819 | if (ch->ch_digi.digi_flags & CTSPACE || |
820 | ch->ch_c_cflag & CRTSCTS) { | |
a82477c3 | 821 | if (!(ch->ch_flags & CH_RECEIVER_OFF)) { |
0b99d589 LL |
822 | ch->ch_bd->bd_ops->disable_receiver(ch); |
823 | ch->ch_flags |= (CH_RECEIVER_OFF); | |
0b99d589 LL |
824 | } |
825 | } | |
826 | /* SWFLOW */ | |
827 | else if (ch->ch_c_iflag & IXOFF) { | |
828 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
829 | ch->ch_bd->bd_ops->send_stop_character(ch); | |
830 | ch->ch_stops_sent++; | |
0b99d589 LL |
831 | } |
832 | } | |
0b99d589 LL |
833 | } |
834 | ||
835 | /* | |
836 | * Check to see if we should unenforce flow control because | |
837 | * ld (or user) finally read enuf data out of our queue. | |
838 | * | |
839 | * NOTE: This is done based on what the current flow control of the | |
840 | * port is set for. | |
841 | * | |
842 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
843 | * This will cause the UART's FIFO to raise RTS back up, | |
844 | * which will allow the other side to start sending data again. | |
845 | * 2) SWFLOW (IXOFF) - Send a start character to | |
846 | * the other side, so it will start sending data to us again. | |
847 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
848 | * other side, we don't need to do anything now. | |
849 | */ | |
850 | if (qleft > (RQUEUESIZE / 2)) { | |
851 | /* HWFLOW */ | |
851f306d CM |
852 | if (ch->ch_digi.digi_flags & RTSPACE || |
853 | ch->ch_c_cflag & CRTSCTS) { | |
0b99d589 LL |
854 | if (ch->ch_flags & CH_RECEIVER_OFF) { |
855 | ch->ch_bd->bd_ops->enable_receiver(ch); | |
856 | ch->ch_flags &= ~(CH_RECEIVER_OFF); | |
0b99d589 LL |
857 | } |
858 | } | |
859 | /* SWFLOW */ | |
860 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
861 | ch->ch_stops_sent = 0; | |
862 | ch->ch_bd->bd_ops->send_start_character(ch); | |
0b99d589 | 863 | } |
0b99d589 LL |
864 | } |
865 | } | |
866 | ||
0b99d589 LL |
867 | void dgnc_wakeup_writes(struct channel_t *ch) |
868 | { | |
869 | int qlen = 0; | |
a44b508a | 870 | unsigned long flags; |
0b99d589 LL |
871 | |
872 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
873 | return; | |
874 | ||
a44b508a | 875 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
876 | |
877 | /* | |
878 | * If channel now has space, wake up anyone waiting on the condition. | |
879 | */ | |
f7c851d4 CP |
880 | qlen = ch->ch_w_head - ch->ch_w_tail; |
881 | if (qlen < 0) | |
90d2a471 | 882 | qlen += WQUEUESIZE; |
0b99d589 LL |
883 | |
884 | if (qlen >= (WQUEUESIZE - 256)) { | |
a44b508a | 885 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
886 | return; |
887 | } | |
888 | ||
889 | if (ch->ch_tun.un_flags & UN_ISOPEN) { | |
6aa56785 | 890 | tty_wakeup(ch->ch_tun.un_tty); |
0b99d589 LL |
891 | |
892 | /* | |
893 | * If unit is set to wait until empty, check to make sure | |
894 | * the queue AND FIFO are both empty. | |
895 | */ | |
896 | if (ch->ch_tun.un_flags & UN_EMPTY) { | |
851f306d | 897 | if ((qlen == 0) && |
e352d3f1 | 898 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) { |
0b99d589 LL |
899 | ch->ch_tun.un_flags &= ~(UN_EMPTY); |
900 | ||
901 | /* | |
902 | * If RTS Toggle mode is on, whenever | |
903 | * the queue and UART is empty, keep RTS low. | |
904 | */ | |
905 | if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) { | |
906 | ch->ch_mostat &= ~(UART_MCR_RTS); | |
907 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
908 | } | |
909 | ||
910 | /* | |
911 | * If DTR Toggle mode is on, whenever | |
912 | * the queue and UART is empty, keep DTR low. | |
913 | */ | |
914 | if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) { | |
915 | ch->ch_mostat &= ~(UART_MCR_DTR); | |
916 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
917 | } | |
918 | } | |
919 | } | |
920 | ||
921 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); | |
922 | } | |
923 | ||
924 | if (ch->ch_pun.un_flags & UN_ISOPEN) { | |
6aa56785 | 925 | tty_wakeup(ch->ch_pun.un_tty); |
0b99d589 LL |
926 | |
927 | /* | |
928 | * If unit is set to wait until empty, check to make sure | |
929 | * the queue AND FIFO are both empty. | |
930 | */ | |
931 | if (ch->ch_pun.un_flags & UN_EMPTY) { | |
851f306d CM |
932 | if ((qlen == 0) && |
933 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) | |
0b99d589 | 934 | ch->ch_pun.un_flags &= ~(UN_EMPTY); |
0b99d589 LL |
935 | } |
936 | ||
937 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); | |
938 | } | |
939 | ||
a44b508a | 940 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
941 | } |
942 | ||
0b99d589 | 943 | /************************************************************************ |
8b07d521 | 944 | * |
0b99d589 | 945 | * TTY Entry points and helper functions |
8b07d521 | 946 | * |
0b99d589 LL |
947 | ************************************************************************/ |
948 | ||
949 | /* | |
950 | * dgnc_tty_open() | |
951 | * | |
952 | */ | |
953 | static int dgnc_tty_open(struct tty_struct *tty, struct file *file) | |
954 | { | |
03425f55 | 955 | struct dgnc_board *brd; |
0b99d589 LL |
956 | struct channel_t *ch; |
957 | struct un_t *un; | |
958 | uint major = 0; | |
959 | uint minor = 0; | |
960 | int rc = 0; | |
a44b508a | 961 | unsigned long flags; |
0b99d589 LL |
962 | |
963 | rc = 0; | |
964 | ||
965 | major = MAJOR(tty_devnum(tty)); | |
966 | minor = MINOR(tty_devnum(tty)); | |
967 | ||
50667c67 | 968 | if (major > 255) |
0b99d589 | 969 | return -ENXIO; |
0b99d589 LL |
970 | |
971 | /* Get board pointer from our array of majors we have allocated */ | |
972 | brd = dgnc_BoardsByMajor[major]; | |
50667c67 | 973 | if (!brd) |
0b99d589 | 974 | return -ENXIO; |
0b99d589 LL |
975 | |
976 | /* | |
977 | * If board is not yet up to a state of READY, go to | |
978 | * sleep waiting for it to happen or they cancel the open. | |
979 | */ | |
980 | rc = wait_event_interruptible(brd->state_wait, | |
e352d3f1 | 981 | (brd->state & BOARD_READY)); |
0b99d589 | 982 | |
50667c67 | 983 | if (rc) |
0b99d589 | 984 | return rc; |
0b99d589 | 985 | |
a44b508a | 986 | spin_lock_irqsave(&brd->bd_lock, flags); |
0b99d589 LL |
987 | |
988 | /* If opened device is greater than our number of ports, bail. */ | |
4bef52f3 | 989 | if (PORT_NUM(minor) >= brd->nasync) { |
a44b508a | 990 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
991 | return -ENXIO; |
992 | } | |
993 | ||
994 | ch = brd->channels[PORT_NUM(minor)]; | |
995 | if (!ch) { | |
a44b508a | 996 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
997 | return -ENXIO; |
998 | } | |
999 | ||
1000 | /* Drop board lock */ | |
a44b508a | 1001 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1002 | |
1003 | /* Grab channel lock */ | |
a44b508a | 1004 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1005 | |
1006 | /* Figure out our type */ | |
1007 | if (!IS_PRINT(minor)) { | |
1008 | un = &brd->channels[PORT_NUM(minor)]->ch_tun; | |
1009 | un->un_type = DGNC_SERIAL; | |
2000c581 | 1010 | } else if (IS_PRINT(minor)) { |
0b99d589 LL |
1011 | un = &brd->channels[PORT_NUM(minor)]->ch_pun; |
1012 | un->un_type = DGNC_PRINT; | |
2000c581 | 1013 | } else { |
a44b508a | 1014 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1015 | return -ENXIO; |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * If the port is still in a previous open, and in a state | |
1020 | * where we simply cannot safely keep going, wait until the | |
1021 | * state clears. | |
1022 | */ | |
a44b508a | 1023 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1024 | |
851f306d CM |
1025 | rc = wait_event_interruptible(ch->ch_flags_wait, |
1026 | ((ch->ch_flags & CH_OPENING) == 0)); | |
0b99d589 LL |
1027 | |
1028 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 1029 | if (rc) |
0b99d589 | 1030 | return -EINTR; |
0b99d589 LL |
1031 | |
1032 | /* | |
1033 | * If either unit is in the middle of the fragile part of close, | |
1034 | * we just cannot touch the channel safely. | |
1035 | * Go to sleep, knowing that when the channel can be | |
1036 | * touched safely, the close routine will signal the | |
1037 | * ch_flags_wait to wake us back up. | |
1038 | */ | |
1039 | rc = wait_event_interruptible(ch->ch_flags_wait, | |
851f306d CM |
1040 | (((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & |
1041 | UN_CLOSING) == 0)); | |
0b99d589 LL |
1042 | |
1043 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 1044 | if (rc) |
0b99d589 | 1045 | return -EINTR; |
0b99d589 | 1046 | |
a44b508a | 1047 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1048 | |
0b99d589 LL |
1049 | /* Store our unit into driver_data, so we always have it available. */ |
1050 | tty->driver_data = un; | |
1051 | ||
0b99d589 LL |
1052 | /* |
1053 | * Initialize tty's | |
1054 | */ | |
1055 | if (!(un->un_flags & UN_ISOPEN)) { | |
1056 | /* Store important variables. */ | |
1057 | un->un_tty = tty; | |
1058 | ||
1059 | /* Maybe do something here to the TTY struct as well? */ | |
1060 | } | |
1061 | ||
0b99d589 LL |
1062 | /* |
1063 | * Allocate channel buffers for read/write/error. | |
1064 | * Set flag, so we don't get trounced on. | |
1065 | */ | |
1066 | ch->ch_flags |= (CH_OPENING); | |
1067 | ||
1068 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
a44b508a | 1069 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1070 | |
1071 | if (!ch->ch_rqueue) | |
52f9d668 | 1072 | ch->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1073 | if (!ch->ch_equeue) |
52f9d668 | 1074 | ch->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1075 | if (!ch->ch_wqueue) |
52f9d668 | 1076 | ch->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1077 | |
16f10a82 DY |
1078 | if (!ch->ch_rqueue || !ch->ch_equeue || !ch->ch_wqueue) { |
1079 | kfree(ch->ch_rqueue); | |
1080 | kfree(ch->ch_equeue); | |
1081 | kfree(ch->ch_wqueue); | |
1082 | ||
1083 | return -ENOMEM; | |
1084 | } | |
1085 | ||
a44b508a | 1086 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1087 | |
1088 | ch->ch_flags &= ~(CH_OPENING); | |
1089 | wake_up_interruptible(&ch->ch_flags_wait); | |
1090 | ||
1091 | /* | |
1092 | * Initialize if neither terminal or printer is open. | |
1093 | */ | |
1094 | if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_ISOPEN)) { | |
0b99d589 LL |
1095 | /* |
1096 | * Flush input queues. | |
1097 | */ | |
587abd7b SL |
1098 | ch->ch_r_head = 0; |
1099 | ch->ch_r_tail = 0; | |
1100 | ch->ch_e_head = 0; | |
1101 | ch->ch_e_tail = 0; | |
1102 | ch->ch_w_head = 0; | |
1103 | ch->ch_w_tail = 0; | |
0b99d589 LL |
1104 | |
1105 | brd->bd_ops->flush_uart_write(ch); | |
1106 | brd->bd_ops->flush_uart_read(ch); | |
1107 | ||
1108 | ch->ch_flags = 0; | |
1109 | ch->ch_cached_lsr = 0; | |
1110 | ch->ch_stop_sending_break = 0; | |
1111 | ch->ch_stops_sent = 0; | |
1112 | ||
22e3de76 LL |
1113 | ch->ch_c_cflag = tty->termios.c_cflag; |
1114 | ch->ch_c_iflag = tty->termios.c_iflag; | |
1115 | ch->ch_c_oflag = tty->termios.c_oflag; | |
1116 | ch->ch_c_lflag = tty->termios.c_lflag; | |
1117 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
1118 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
1119 | |
1120 | /* | |
1121 | * Bring up RTS and DTR... | |
1122 | * Also handle RTS or DTR toggle if set. | |
1123 | */ | |
1124 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
1125 | ch->ch_mostat |= (UART_MCR_RTS); | |
1126 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
1127 | ch->ch_mostat |= (UART_MCR_DTR); | |
1128 | ||
1129 | /* Tell UART to init itself */ | |
1130 | brd->bd_ops->uart_init(ch); | |
1131 | } | |
1132 | ||
1133 | /* | |
1134 | * Run param in case we changed anything | |
1135 | */ | |
1136 | brd->bd_ops->param(tty); | |
1137 | ||
1138 | dgnc_carrier(ch); | |
1139 | ||
8b07d521 | 1140 | /* |
0b99d589 LL |
1141 | * follow protocol for opening port |
1142 | */ | |
1143 | ||
a44b508a | 1144 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1145 | |
1146 | rc = dgnc_block_til_ready(tty, file, ch); | |
1147 | ||
0b99d589 | 1148 | /* No going back now, increment our unit and channel counters */ |
a44b508a | 1149 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1150 | ch->ch_open_count++; |
1151 | un->un_open_count++; | |
1152 | un->un_flags |= (UN_ISOPEN); | |
a44b508a | 1153 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1154 | |
8f90ef80 | 1155 | return rc; |
0b99d589 LL |
1156 | } |
1157 | ||
8b07d521 | 1158 | /* |
0b99d589 LL |
1159 | * dgnc_block_til_ready() |
1160 | * | |
1161 | * Wait for DCD, if needed. | |
1162 | */ | |
851f306d CM |
1163 | static int dgnc_block_til_ready(struct tty_struct *tty, |
1164 | struct file *file, | |
1165 | struct channel_t *ch) | |
8b07d521 | 1166 | { |
0b99d589 | 1167 | int retval = 0; |
10334418 | 1168 | struct un_t *un = tty->driver_data; |
a44b508a | 1169 | unsigned long flags; |
0b99d589 LL |
1170 | uint old_flags = 0; |
1171 | int sleep_on_un_flags = 0; | |
1172 | ||
10334418 | 1173 | if (!file) |
8f90ef80 | 1174 | return -ENXIO; |
0b99d589 | 1175 | |
a44b508a | 1176 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1177 | |
1178 | ch->ch_wopen++; | |
1179 | ||
1180 | /* Loop forever */ | |
1181 | while (1) { | |
0b99d589 LL |
1182 | sleep_on_un_flags = 0; |
1183 | ||
1184 | /* | |
851f306d CM |
1185 | * If board has failed somehow during our sleep, |
1186 | * bail with error. | |
0b99d589 LL |
1187 | */ |
1188 | if (ch->ch_bd->state == BOARD_FAILED) { | |
1189 | retval = -ENXIO; | |
1190 | break; | |
1191 | } | |
1192 | ||
1193 | /* If tty was hung up, break out of loop and set error. */ | |
1194 | if (tty_hung_up_p(file)) { | |
1195 | retval = -EAGAIN; | |
1196 | break; | |
1197 | } | |
1198 | ||
1199 | /* | |
1200 | * If either unit is in the middle of the fragile part of close, | |
1201 | * we just cannot touch the channel safely. | |
1202 | * Go back to sleep, knowing that when the channel can be | |
8b07d521 | 1203 | * touched safely, the close routine will signal the |
0b99d589 LL |
1204 | * ch_wait_flags to wake us back up. |
1205 | */ | |
851f306d CM |
1206 | if (!((ch->ch_tun.un_flags | |
1207 | ch->ch_pun.un_flags) & | |
1208 | UN_CLOSING)) { | |
0b99d589 LL |
1209 | /* |
1210 | * Our conditions to leave cleanly and happily: | |
1211 | * 1) NONBLOCKING on the tty is set. | |
1212 | * 2) CLOCAL is set. | |
1213 | * 3) DCD (fake or real) is active. | |
1214 | */ | |
1215 | ||
50667c67 | 1216 | if (file->f_flags & O_NONBLOCK) |
0b99d589 | 1217 | break; |
0b99d589 | 1218 | |
18900ca6 | 1219 | if (tty_io_error(tty)) { |
0b99d589 LL |
1220 | retval = -EIO; |
1221 | break; | |
1222 | } | |
1223 | ||
f1e51745 | 1224 | if (ch->ch_flags & CH_CD) |
0b99d589 | 1225 | break; |
0b99d589 | 1226 | |
f1e51745 | 1227 | if (ch->ch_flags & CH_FCAR) |
0b99d589 | 1228 | break; |
2000c581 | 1229 | } else { |
0b99d589 LL |
1230 | sleep_on_un_flags = 1; |
1231 | } | |
1232 | ||
1233 | /* | |
1234 | * If there is a signal pending, the user probably | |
1235 | * interrupted (ctrl-c) us. | |
1236 | * Leave loop with error set. | |
1237 | */ | |
1238 | if (signal_pending(current)) { | |
0b99d589 LL |
1239 | retval = -ERESTARTSYS; |
1240 | break; | |
1241 | } | |
1242 | ||
0b99d589 LL |
1243 | /* |
1244 | * Store the flags before we let go of channel lock | |
1245 | */ | |
1246 | if (sleep_on_un_flags) | |
1247 | old_flags = ch->ch_tun.un_flags | ch->ch_pun.un_flags; | |
1248 | else | |
1249 | old_flags = ch->ch_flags; | |
1250 | ||
1251 | /* | |
1252 | * Let go of channel lock before calling schedule. | |
1253 | * Our poller will get any FEP events and wake us up when DCD | |
1254 | * eventually goes active. | |
1255 | */ | |
1256 | ||
a44b508a | 1257 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1258 | |
0b99d589 | 1259 | /* |
851f306d CM |
1260 | * Wait for something in the flags to change |
1261 | * from the current value. | |
0b99d589 | 1262 | */ |
50667c67 | 1263 | if (sleep_on_un_flags) |
0b99d589 | 1264 | retval = wait_event_interruptible(un->un_flags_wait, |
851f306d CM |
1265 | (old_flags != (ch->ch_tun.un_flags | |
1266 | ch->ch_pun.un_flags))); | |
50667c67 | 1267 | else |
0b99d589 LL |
1268 | retval = wait_event_interruptible(ch->ch_flags_wait, |
1269 | (old_flags != ch->ch_flags)); | |
0b99d589 | 1270 | |
0b99d589 LL |
1271 | /* |
1272 | * We got woken up for some reason. | |
1273 | * Before looping around, grab our channel lock. | |
1274 | */ | |
a44b508a | 1275 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1276 | } |
1277 | ||
1278 | ch->ch_wopen--; | |
1279 | ||
a44b508a | 1280 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1281 | |
36e712a8 | 1282 | return retval; |
0b99d589 LL |
1283 | } |
1284 | ||
0b99d589 LL |
1285 | /* |
1286 | * dgnc_tty_hangup() | |
1287 | * | |
1288 | * Hangup the port. Like a close, but don't wait for output to drain. | |
8b07d521 | 1289 | */ |
0b99d589 LL |
1290 | static void dgnc_tty_hangup(struct tty_struct *tty) |
1291 | { | |
0b99d589 LL |
1292 | if (!tty || tty->magic != TTY_MAGIC) |
1293 | return; | |
1294 | ||
0b99d589 LL |
1295 | /* flush the transmit queues */ |
1296 | dgnc_tty_flush_buffer(tty); | |
0b99d589 LL |
1297 | } |
1298 | ||
0b99d589 LL |
1299 | /* |
1300 | * dgnc_tty_close() | |
1301 | * | |
1302 | */ | |
1303 | static void dgnc_tty_close(struct tty_struct *tty, struct file *file) | |
1304 | { | |
03425f55 | 1305 | struct dgnc_board *bd; |
0b99d589 LL |
1306 | struct channel_t *ch; |
1307 | struct un_t *un; | |
a44b508a | 1308 | unsigned long flags; |
0b99d589 LL |
1309 | |
1310 | if (!tty || tty->magic != TTY_MAGIC) | |
1311 | return; | |
1312 | ||
1313 | un = tty->driver_data; | |
1314 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1315 | return; | |
1316 | ||
1317 | ch = un->un_ch; | |
1318 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1319 | return; | |
1320 | ||
1321 | bd = ch->ch_bd; | |
1322 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1323 | return; | |
1324 | ||
a44b508a | 1325 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1326 | |
1327 | /* | |
1328 | * Determine if this is the last close or not - and if we agree about | |
1329 | * which type of close it is with the Line Discipline | |
1330 | */ | |
1331 | if ((tty->count == 1) && (un->un_open_count != 1)) { | |
1332 | /* | |
1333 | * Uh, oh. tty->count is 1, which means that the tty | |
1334 | * structure will be freed. un_open_count should always | |
1335 | * be one in these conditions. If it's greater than | |
1336 | * one, we've got real problems, since it means the | |
1337 | * serial port won't be shutdown. | |
1338 | */ | |
1f26adc9 RD |
1339 | dev_dbg(tty->dev, |
1340 | "tty->count is 1, un open count is %d\n", | |
1341 | un->un_open_count); | |
0b99d589 | 1342 | un->un_open_count = 1; |
8b07d521 | 1343 | } |
0b99d589 | 1344 | |
3098e514 DY |
1345 | if (un->un_open_count) |
1346 | un->un_open_count--; | |
1347 | else | |
1f26adc9 RD |
1348 | dev_dbg(tty->dev, |
1349 | "bad serial port open count of %d\n", | |
1350 | un->un_open_count); | |
0b99d589 LL |
1351 | |
1352 | ch->ch_open_count--; | |
1353 | ||
1354 | if (ch->ch_open_count && un->un_open_count) { | |
a44b508a | 1355 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
90d2a471 LL |
1356 | return; |
1357 | } | |
0b99d589 LL |
1358 | |
1359 | /* OK, its the last close on the unit */ | |
0b99d589 LL |
1360 | un->un_flags |= UN_CLOSING; |
1361 | ||
1362 | tty->closing = 1; | |
1363 | ||
0b99d589 LL |
1364 | /* |
1365 | * Only officially close channel if count is 0 and | |
90d2a471 | 1366 | * DIGI_PRINTER bit is not set. |
0b99d589 | 1367 | */ |
851f306d CM |
1368 | if ((ch->ch_open_count == 0) && |
1369 | !(ch->ch_digi.digi_flags & DIGI_PRINTER)) { | |
0b99d589 LL |
1370 | ch->ch_flags &= ~(CH_STOPI | CH_FORCED_STOPI); |
1371 | ||
1372 | /* | |
1373 | * turn off print device when closing print device. | |
1374 | */ | |
9cdf838b | 1375 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1376 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1377 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1378 | ch->ch_flags &= ~CH_PRON; |
1379 | } | |
1380 | ||
a44b508a | 1381 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1382 | /* wait for output to drain */ |
1383 | /* This will also return if we take an interrupt */ | |
1384 | ||
2d9920ec | 1385 | bd->bd_ops->drain(tty, 0); |
0b99d589 | 1386 | |
0b99d589 LL |
1387 | dgnc_tty_flush_buffer(tty); |
1388 | tty_ldisc_flush(tty); | |
1389 | ||
a44b508a | 1390 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1391 | |
1392 | tty->closing = 0; | |
1393 | ||
1394 | /* | |
1395 | * If we have HUPCL set, lower DTR and RTS | |
1396 | */ | |
1397 | if (ch->ch_c_cflag & HUPCL) { | |
0b99d589 LL |
1398 | /* Drop RTS/DTR */ |
1399 | ch->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
1400 | bd->bd_ops->assert_modem_signals(ch); | |
1401 | ||
1402 | /* | |
8b07d521 | 1403 | * Go to sleep to ensure RTS/DTR |
0b99d589 LL |
1404 | * have been dropped for modems to see it. |
1405 | */ | |
1406 | if (ch->ch_close_delay) { | |
a44b508a RD |
1407 | spin_unlock_irqrestore(&ch->ch_lock, |
1408 | flags); | |
0b99d589 | 1409 | dgnc_ms_sleep(ch->ch_close_delay); |
a44b508a | 1410 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1411 | } |
1412 | } | |
1413 | ||
1414 | ch->ch_old_baud = 0; | |
1415 | ||
1416 | /* Turn off UART interrupts for this port */ | |
1417 | ch->ch_bd->bd_ops->uart_off(ch); | |
2000c581 | 1418 | } else { |
0b99d589 LL |
1419 | /* |
1420 | * turn off print device when closing print device. | |
1421 | */ | |
9cdf838b | 1422 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1423 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1424 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1425 | ch->ch_flags &= ~CH_PRON; |
1426 | } | |
1427 | } | |
1428 | ||
1429 | un->un_tty = NULL; | |
1430 | un->un_flags &= ~(UN_ISOPEN | UN_CLOSING); | |
1431 | ||
0b99d589 LL |
1432 | wake_up_interruptible(&ch->ch_flags_wait); |
1433 | wake_up_interruptible(&un->un_flags_wait); | |
1434 | ||
a44b508a | 1435 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1436 | } |
1437 | ||
0b99d589 LL |
1438 | /* |
1439 | * dgnc_tty_chars_in_buffer() | |
1440 | * | |
1441 | * Return number of characters that have not been transmitted yet. | |
1442 | * | |
1443 | * This routine is used by the line discipline to determine if there | |
1444 | * is data waiting to be transmitted/drained/flushed or not. | |
1445 | */ | |
1446 | static int dgnc_tty_chars_in_buffer(struct tty_struct *tty) | |
1447 | { | |
1448 | struct channel_t *ch = NULL; | |
1449 | struct un_t *un = NULL; | |
1450 | ushort thead; | |
1451 | ushort ttail; | |
1452 | uint tmask; | |
1453 | uint chars = 0; | |
a44b508a | 1454 | unsigned long flags; |
0b99d589 | 1455 | |
60acb623 | 1456 | if (!tty) |
8f90ef80 | 1457 | return 0; |
0b99d589 LL |
1458 | |
1459 | un = tty->driver_data; | |
1460 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1461 | return 0; |
0b99d589 LL |
1462 | |
1463 | ch = un->un_ch; | |
1464 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1465 | return 0; |
0b99d589 | 1466 | |
a44b508a | 1467 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1468 | |
1469 | tmask = WQUEUEMASK; | |
1470 | thead = ch->ch_w_head & tmask; | |
1471 | ttail = ch->ch_w_tail & tmask; | |
1472 | ||
a44b508a | 1473 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1474 | |
1475 | if (ttail == thead) { | |
1476 | chars = 0; | |
1477 | } else { | |
1478 | if (thead >= ttail) | |
1479 | chars = thead - ttail; | |
1480 | else | |
1481 | chars = thead - ttail + WQUEUESIZE; | |
1482 | } | |
1483 | ||
8f90ef80 | 1484 | return chars; |
0b99d589 LL |
1485 | } |
1486 | ||
8b07d521 | 1487 | /* |
0b99d589 LL |
1488 | * dgnc_maxcps_room |
1489 | * | |
1490 | * Reduces bytes_available to the max number of characters | |
1491 | * that can be sent currently given the maxcps value, and | |
1492 | * returns the new bytes_available. This only affects printer | |
1493 | * output. | |
8b07d521 | 1494 | */ |
107b40ad | 1495 | static int dgnc_maxcps_room(struct channel_t *ch, int bytes_available) |
0b99d589 | 1496 | { |
9cdf838b | 1497 | if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0) { |
0b99d589 LL |
1498 | int cps_limit = 0; |
1499 | unsigned long current_time = jiffies; | |
1500 | unsigned long buffer_time = current_time + | |
851f306d CM |
1501 | (HZ * ch->ch_digi.digi_bufsize) / |
1502 | ch->ch_digi.digi_maxcps; | |
0b99d589 LL |
1503 | |
1504 | if (ch->ch_cpstime < current_time) { | |
1505 | /* buffer is empty */ | |
851f306d | 1506 | ch->ch_cpstime = current_time; /* reset ch_cpstime */ |
0b99d589 | 1507 | cps_limit = ch->ch_digi.digi_bufsize; |
2000c581 | 1508 | } else if (ch->ch_cpstime < buffer_time) { |
0b99d589 | 1509 | /* still room in the buffer */ |
851f306d CM |
1510 | cps_limit = ((buffer_time - ch->ch_cpstime) * |
1511 | ch->ch_digi.digi_maxcps) / HZ; | |
2000c581 | 1512 | } else { |
0b99d589 | 1513 | /* no room in the buffer */ |
8b07d521 | 1514 | cps_limit = 0; |
0b99d589 LL |
1515 | } |
1516 | ||
1517 | bytes_available = min(cps_limit, bytes_available); | |
1518 | } | |
1519 | ||
8f90ef80 | 1520 | return bytes_available; |
0b99d589 LL |
1521 | } |
1522 | ||
0b99d589 LL |
1523 | /* |
1524 | * dgnc_tty_write_room() | |
1525 | * | |
1526 | * Return space available in Tx buffer | |
8b07d521 | 1527 | */ |
0b99d589 LL |
1528 | static int dgnc_tty_write_room(struct tty_struct *tty) |
1529 | { | |
1530 | struct channel_t *ch = NULL; | |
1531 | struct un_t *un = NULL; | |
1532 | ushort head; | |
1533 | ushort tail; | |
1534 | ushort tmask; | |
1535 | int ret = 0; | |
a44b508a | 1536 | unsigned long flags; |
0b99d589 | 1537 | |
60acb623 | 1538 | if (!tty || !dgnc_TmpWriteBuf) |
8f90ef80 | 1539 | return 0; |
0b99d589 LL |
1540 | |
1541 | un = tty->driver_data; | |
1542 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1543 | return 0; |
0b99d589 LL |
1544 | |
1545 | ch = un->un_ch; | |
1546 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1547 | return 0; |
0b99d589 | 1548 | |
a44b508a | 1549 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1550 | |
1551 | tmask = WQUEUEMASK; | |
1552 | head = (ch->ch_w_head) & tmask; | |
1553 | tail = (ch->ch_w_tail) & tmask; | |
1554 | ||
f7c851d4 CP |
1555 | ret = tail - head - 1; |
1556 | if (ret < 0) | |
0b99d589 LL |
1557 | ret += WQUEUESIZE; |
1558 | ||
1559 | /* Limit printer to maxcps */ | |
107b40ad DY |
1560 | if (un->un_type != DGNC_PRINT) |
1561 | ret = dgnc_maxcps_room(ch, ret); | |
0b99d589 LL |
1562 | |
1563 | /* | |
8b07d521 | 1564 | * If we are printer device, leave space for |
0b99d589 LL |
1565 | * possibly both the on and off strings. |
1566 | */ | |
1567 | if (un->un_type == DGNC_PRINT) { | |
1568 | if (!(ch->ch_flags & CH_PRON)) | |
1569 | ret -= ch->ch_digi.digi_onlen; | |
1570 | ret -= ch->ch_digi.digi_offlen; | |
2000c581 | 1571 | } else { |
0b99d589 LL |
1572 | if (ch->ch_flags & CH_PRON) |
1573 | ret -= ch->ch_digi.digi_offlen; | |
1574 | } | |
1575 | ||
1576 | if (ret < 0) | |
1577 | ret = 0; | |
1578 | ||
a44b508a | 1579 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8b07d521 | 1580 | |
8f90ef80 | 1581 | return ret; |
0b99d589 LL |
1582 | } |
1583 | ||
0b99d589 LL |
1584 | /* |
1585 | * dgnc_tty_put_char() | |
1586 | * | |
1587 | * Put a character into ch->ch_buf | |
8b07d521 | 1588 | * |
0b99d589 LL |
1589 | * - used by the line discipline for OPOST processing |
1590 | */ | |
1591 | static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c) | |
1592 | { | |
1593 | /* | |
1594 | * Simply call tty_write. | |
1595 | */ | |
0b99d589 LL |
1596 | dgnc_tty_write(tty, &c, 1); |
1597 | return 1; | |
1598 | } | |
1599 | ||
0b99d589 LL |
1600 | /* |
1601 | * dgnc_tty_write() | |
1602 | * | |
1603 | * Take data from the user or kernel and send it out to the FEP. | |
1604 | * In here exists all the Transparent Print magic as well. | |
1605 | */ | |
1606 | static int dgnc_tty_write(struct tty_struct *tty, | |
e352d3f1 | 1607 | const unsigned char *buf, int count) |
0b99d589 LL |
1608 | { |
1609 | struct channel_t *ch = NULL; | |
1610 | struct un_t *un = NULL; | |
1611 | int bufcount = 0, n = 0; | |
a44b508a | 1612 | unsigned long flags; |
0b99d589 LL |
1613 | ushort head; |
1614 | ushort tail; | |
1615 | ushort tmask; | |
1616 | uint remain; | |
0b99d589 | 1617 | |
60acb623 | 1618 | if (!tty || !dgnc_TmpWriteBuf) |
8f90ef80 | 1619 | return 0; |
0b99d589 LL |
1620 | |
1621 | un = tty->driver_data; | |
1622 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1623 | return 0; |
0b99d589 LL |
1624 | |
1625 | ch = un->un_ch; | |
1626 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1627 | return 0; |
0b99d589 LL |
1628 | |
1629 | if (!count) | |
8f90ef80 | 1630 | return 0; |
0b99d589 | 1631 | |
0b99d589 LL |
1632 | /* |
1633 | * Store original amount of characters passed in. | |
1634 | * This helps to figure out if we should ask the FEP | |
1635 | * to send us an event when it has more space available. | |
1636 | */ | |
0b99d589 | 1637 | |
a44b508a | 1638 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1639 | |
1640 | /* Get our space available for the channel from the board */ | |
1641 | tmask = WQUEUEMASK; | |
1642 | head = (ch->ch_w_head) & tmask; | |
1643 | tail = (ch->ch_w_tail) & tmask; | |
1644 | ||
f7c851d4 CP |
1645 | bufcount = tail - head - 1; |
1646 | if (bufcount < 0) | |
0b99d589 LL |
1647 | bufcount += WQUEUESIZE; |
1648 | ||
0b99d589 LL |
1649 | /* |
1650 | * Limit printer output to maxcps overall, with bursts allowed | |
1651 | * up to bufsize characters. | |
1652 | */ | |
107b40ad DY |
1653 | if (un->un_type != DGNC_PRINT) |
1654 | bufcount = dgnc_maxcps_room(ch, bufcount); | |
0b99d589 LL |
1655 | |
1656 | /* | |
1657 | * Take minimum of what the user wants to send, and the | |
1658 | * space available in the FEP buffer. | |
1659 | */ | |
1660 | count = min(count, bufcount); | |
1661 | ||
1662 | /* | |
1663 | * Bail if no space left. | |
1664 | */ | |
c84a083b QL |
1665 | if (count <= 0) |
1666 | goto exit_retry; | |
0b99d589 LL |
1667 | |
1668 | /* | |
1669 | * Output the printer ON string, if we are in terminal mode, but | |
1670 | * need to be in printer mode. | |
1671 | */ | |
1672 | if ((un->un_type == DGNC_PRINT) && !(ch->ch_flags & CH_PRON)) { | |
1673 | dgnc_wmove(ch, ch->ch_digi.digi_onstr, | |
e352d3f1 | 1674 | (int)ch->ch_digi.digi_onlen); |
0b99d589 LL |
1675 | head = (ch->ch_w_head) & tmask; |
1676 | ch->ch_flags |= CH_PRON; | |
1677 | } | |
1678 | ||
1679 | /* | |
1680 | * On the other hand, output the printer OFF string, if we are | |
1681 | * currently in printer mode, but need to output to the terminal. | |
1682 | */ | |
1683 | if ((un->un_type != DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { | |
1684 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, | |
e352d3f1 | 1685 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1686 | head = (ch->ch_w_head) & tmask; |
1687 | ch->ch_flags &= ~CH_PRON; | |
1688 | } | |
1689 | ||
0b99d589 LL |
1690 | n = count; |
1691 | ||
1692 | /* | |
1693 | * If the write wraps over the top of the circular buffer, | |
1694 | * move the portion up to the wrap point, and reset the | |
1695 | * pointers to the bottom. | |
1696 | */ | |
1697 | remain = WQUEUESIZE - head; | |
1698 | ||
1699 | if (n >= remain) { | |
1700 | n -= remain; | |
1701 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1702 | head = 0; |
1703 | buf += remain; | |
1704 | } | |
1705 | ||
1706 | if (n > 0) { | |
1707 | /* | |
1708 | * Move rest of data. | |
1709 | */ | |
1710 | remain = n; | |
1711 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1712 | head += remain; |
1713 | } | |
1714 | ||
1715 | if (count) { | |
1716 | head &= tmask; | |
1717 | ch->ch_w_head = head; | |
1718 | } | |
1719 | ||
0b99d589 | 1720 | /* Update printer buffer empty time. */ |
8d0d4cc5 RS |
1721 | if ((un->un_type == DGNC_PRINT) && (ch->ch_digi.digi_maxcps > 0) && |
1722 | (ch->ch_digi.digi_bufsize > 0)) { | |
90d2a471 | 1723 | ch->ch_cpstime += (HZ * count) / ch->ch_digi.digi_maxcps; |
0b99d589 LL |
1724 | } |
1725 | ||
a74d8e21 | 1726 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1727 | |
0b99d589 LL |
1728 | if (count) { |
1729 | /* | |
1730 | * Channel lock is grabbed and then released | |
1731 | * inside this routine. | |
1732 | */ | |
1733 | ch->ch_bd->bd_ops->copy_data_from_queue_to_uart(ch); | |
1734 | } | |
1735 | ||
8f90ef80 | 1736 | return count; |
c84a083b QL |
1737 | |
1738 | exit_retry: | |
1739 | ||
1740 | spin_unlock_irqrestore(&ch->ch_lock, flags); | |
1741 | return 0; | |
0b99d589 LL |
1742 | } |
1743 | ||
0b99d589 LL |
1744 | /* |
1745 | * Return modem signals to ld. | |
1746 | */ | |
b74c7461 | 1747 | |
0b99d589 | 1748 | static int dgnc_tty_tiocmget(struct tty_struct *tty) |
0b99d589 LL |
1749 | { |
1750 | struct channel_t *ch; | |
1751 | struct un_t *un; | |
1752 | int result = -EIO; | |
446393e9 | 1753 | unsigned char mstat = 0; |
a44b508a | 1754 | unsigned long flags; |
0b99d589 LL |
1755 | |
1756 | if (!tty || tty->magic != TTY_MAGIC) | |
1757 | return result; | |
1758 | ||
1759 | un = tty->driver_data; | |
1760 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1761 | return result; | |
1762 | ||
1763 | ch = un->un_ch; | |
1764 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1765 | return result; | |
1766 | ||
a44b508a | 1767 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1768 | |
0b7ceaa6 | 1769 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1770 | |
a44b508a | 1771 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1772 | |
1773 | result = 0; | |
1774 | ||
1775 | if (mstat & UART_MCR_DTR) | |
1776 | result |= TIOCM_DTR; | |
1777 | if (mstat & UART_MCR_RTS) | |
1778 | result |= TIOCM_RTS; | |
1779 | if (mstat & UART_MSR_CTS) | |
1780 | result |= TIOCM_CTS; | |
1781 | if (mstat & UART_MSR_DSR) | |
1782 | result |= TIOCM_DSR; | |
1783 | if (mstat & UART_MSR_RI) | |
1784 | result |= TIOCM_RI; | |
1785 | if (mstat & UART_MSR_DCD) | |
1786 | result |= TIOCM_CD; | |
1787 | ||
0b99d589 LL |
1788 | return result; |
1789 | } | |
1790 | ||
0b99d589 LL |
1791 | /* |
1792 | * dgnc_tty_tiocmset() | |
1793 | * | |
1794 | * Set modem signals, called by ld. | |
1795 | */ | |
b74c7461 | 1796 | |
0b99d589 | 1797 | static int dgnc_tty_tiocmset(struct tty_struct *tty, |
e352d3f1 | 1798 | unsigned int set, unsigned int clear) |
0b99d589 | 1799 | { |
03425f55 | 1800 | struct dgnc_board *bd; |
0b99d589 LL |
1801 | struct channel_t *ch; |
1802 | struct un_t *un; | |
1803 | int ret = -EIO; | |
a44b508a | 1804 | unsigned long flags; |
0b99d589 LL |
1805 | |
1806 | if (!tty || tty->magic != TTY_MAGIC) | |
1807 | return ret; | |
1808 | ||
1809 | un = tty->driver_data; | |
1810 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1811 | return ret; | |
1812 | ||
1813 | ch = un->un_ch; | |
1814 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1815 | return ret; | |
1816 | ||
1817 | bd = ch->ch_bd; | |
1818 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1819 | return ret; | |
1820 | ||
a44b508a | 1821 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1822 | |
50667c67 | 1823 | if (set & TIOCM_RTS) |
0b99d589 | 1824 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 1825 | |
50667c67 | 1826 | if (set & TIOCM_DTR) |
0b99d589 | 1827 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 | 1828 | |
50667c67 | 1829 | if (clear & TIOCM_RTS) |
0b99d589 | 1830 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 1831 | |
50667c67 | 1832 | if (clear & TIOCM_DTR) |
0b99d589 | 1833 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
1834 | |
1835 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
1836 | ||
a44b508a | 1837 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1838 | |
8f90ef80 | 1839 | return 0; |
0b99d589 LL |
1840 | } |
1841 | ||
0b99d589 LL |
1842 | /* |
1843 | * dgnc_tty_send_break() | |
1844 | * | |
1845 | * Send a Break, called by ld. | |
1846 | */ | |
1847 | static int dgnc_tty_send_break(struct tty_struct *tty, int msec) | |
1848 | { | |
03425f55 | 1849 | struct dgnc_board *bd; |
0b99d589 LL |
1850 | struct channel_t *ch; |
1851 | struct un_t *un; | |
1852 | int ret = -EIO; | |
a44b508a | 1853 | unsigned long flags; |
0b99d589 LL |
1854 | |
1855 | if (!tty || tty->magic != TTY_MAGIC) | |
1856 | return ret; | |
1857 | ||
1858 | un = tty->driver_data; | |
1859 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1860 | return ret; | |
1861 | ||
1862 | ch = un->un_ch; | |
1863 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1864 | return ret; | |
1865 | ||
1866 | bd = ch->ch_bd; | |
1867 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1868 | return ret; | |
1869 | ||
1870 | switch (msec) { | |
1871 | case -1: | |
1872 | msec = 0xFFFF; | |
1873 | break; | |
1874 | case 0: | |
1875 | msec = 0; | |
1876 | break; | |
1877 | default: | |
1878 | break; | |
1879 | } | |
1880 | ||
a44b508a | 1881 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1882 | |
1883 | ch->ch_bd->bd_ops->send_break(ch, msec); | |
1884 | ||
a44b508a | 1885 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1886 | |
8f90ef80 | 1887 | return 0; |
0b99d589 LL |
1888 | } |
1889 | ||
0b99d589 LL |
1890 | /* |
1891 | * dgnc_tty_wait_until_sent() | |
1892 | * | |
1893 | * wait until data has been transmitted, called by ld. | |
1894 | */ | |
1895 | static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
1896 | { | |
03425f55 | 1897 | struct dgnc_board *bd; |
0b99d589 LL |
1898 | struct channel_t *ch; |
1899 | struct un_t *un; | |
0b99d589 LL |
1900 | |
1901 | if (!tty || tty->magic != TTY_MAGIC) | |
1902 | return; | |
1903 | ||
1904 | un = tty->driver_data; | |
1905 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1906 | return; | |
1907 | ||
1908 | ch = un->un_ch; | |
1909 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1910 | return; | |
1911 | ||
1912 | bd = ch->ch_bd; | |
1913 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1914 | return; | |
1915 | ||
2d9920ec | 1916 | bd->bd_ops->drain(tty, 0); |
8b07d521 | 1917 | } |
0b99d589 | 1918 | |
0b99d589 LL |
1919 | /* |
1920 | * dgnc_send_xchar() | |
1921 | * | |
1922 | * send a high priority character, called by ld. | |
1923 | */ | |
1924 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char c) | |
1925 | { | |
03425f55 | 1926 | struct dgnc_board *bd; |
0b99d589 LL |
1927 | struct channel_t *ch; |
1928 | struct un_t *un; | |
a44b508a | 1929 | unsigned long flags; |
0b99d589 LL |
1930 | |
1931 | if (!tty || tty->magic != TTY_MAGIC) | |
1932 | return; | |
1933 | ||
1934 | un = tty->driver_data; | |
1935 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1936 | return; | |
1937 | ||
1938 | ch = un->un_ch; | |
1939 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1940 | return; | |
1941 | ||
1942 | bd = ch->ch_bd; | |
1943 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1944 | return; | |
1945 | ||
f3dadd29 | 1946 | dev_dbg(tty->dev, "dgnc_tty_send_xchar start\n"); |
0b99d589 | 1947 | |
a44b508a | 1948 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1949 | bd->bd_ops->send_immediate_char(ch, c); |
a44b508a | 1950 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1951 | |
f3dadd29 | 1952 | dev_dbg(tty->dev, "dgnc_tty_send_xchar finish\n"); |
8b07d521 | 1953 | } |
0b99d589 | 1954 | |
0b99d589 LL |
1955 | /* |
1956 | * Return modem signals to ld. | |
1957 | */ | |
1958 | static inline int dgnc_get_mstat(struct channel_t *ch) | |
1959 | { | |
1960 | unsigned char mstat; | |
290e3aba | 1961 | int result = 0; |
a44b508a | 1962 | unsigned long flags; |
0b99d589 | 1963 | |
0b99d589 | 1964 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
8f90ef80 | 1965 | return -ENXIO; |
0b99d589 | 1966 | |
a44b508a | 1967 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1968 | |
0b7ceaa6 | 1969 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1970 | |
a44b508a | 1971 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1972 | |
0b99d589 LL |
1973 | if (mstat & UART_MCR_DTR) |
1974 | result |= TIOCM_DTR; | |
1975 | if (mstat & UART_MCR_RTS) | |
1976 | result |= TIOCM_RTS; | |
1977 | if (mstat & UART_MSR_CTS) | |
1978 | result |= TIOCM_CTS; | |
1979 | if (mstat & UART_MSR_DSR) | |
1980 | result |= TIOCM_DSR; | |
1981 | if (mstat & UART_MSR_RI) | |
1982 | result |= TIOCM_RI; | |
1983 | if (mstat & UART_MSR_DCD) | |
1984 | result |= TIOCM_CD; | |
1985 | ||
8f90ef80 | 1986 | return result; |
0b99d589 LL |
1987 | } |
1988 | ||
0b99d589 LL |
1989 | /* |
1990 | * Return modem signals to ld. | |
1991 | */ | |
851f306d CM |
1992 | static int dgnc_get_modem_info(struct channel_t *ch, |
1993 | unsigned int __user *value) | |
0b99d589 | 1994 | { |
a5b90ef7 | 1995 | return put_user(dgnc_get_mstat(ch), value); |
0b99d589 LL |
1996 | } |
1997 | ||
0b99d589 LL |
1998 | /* |
1999 | * dgnc_set_modem_info() | |
2000 | * | |
2001 | * Set modem signals, called by ld. | |
2002 | */ | |
c23b48e0 | 2003 | static int dgnc_set_modem_info(struct channel_t *ch, |
851f306d CM |
2004 | unsigned int command, |
2005 | unsigned int __user *value) | |
0b99d589 | 2006 | { |
0b99d589 LL |
2007 | int ret = -ENXIO; |
2008 | unsigned int arg = 0; | |
a44b508a | 2009 | unsigned long flags; |
0b99d589 | 2010 | |
0b99d589 LL |
2011 | ret = get_user(arg, value); |
2012 | if (ret) | |
8f90ef80 | 2013 | return ret; |
0b99d589 LL |
2014 | |
2015 | switch (command) { | |
2016 | case TIOCMBIS: | |
50667c67 | 2017 | if (arg & TIOCM_RTS) |
0b99d589 | 2018 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 2019 | |
50667c67 | 2020 | if (arg & TIOCM_DTR) |
0b99d589 | 2021 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 LL |
2022 | |
2023 | break; | |
2024 | ||
2025 | case TIOCMBIC: | |
50667c67 | 2026 | if (arg & TIOCM_RTS) |
0b99d589 | 2027 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 2028 | |
50667c67 | 2029 | if (arg & TIOCM_DTR) |
0b99d589 | 2030 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
2031 | |
2032 | break; | |
2033 | ||
90d2a471 | 2034 | case TIOCMSET: |
0b99d589 | 2035 | |
50667c67 | 2036 | if (arg & TIOCM_RTS) |
0b99d589 | 2037 | ch->ch_mostat |= UART_MCR_RTS; |
50667c67 | 2038 | else |
0b99d589 | 2039 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 2040 | |
50667c67 | 2041 | if (arg & TIOCM_DTR) |
0b99d589 | 2042 | ch->ch_mostat |= UART_MCR_DTR; |
50667c67 | 2043 | else |
0b99d589 | 2044 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
2045 | |
2046 | break; | |
2047 | ||
2048 | default: | |
8f90ef80 | 2049 | return -EINVAL; |
0b99d589 LL |
2050 | } |
2051 | ||
a44b508a | 2052 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2053 | |
2054 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
2055 | ||
a44b508a | 2056 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2057 | |
8f90ef80 | 2058 | return 0; |
0b99d589 LL |
2059 | } |
2060 | ||
0b99d589 | 2061 | /* |
8b07d521 | 2062 | * dgnc_tty_digigeta() |
0b99d589 LL |
2063 | * |
2064 | * Ioctl to get the information for ditty. | |
2065 | * | |
2066 | * | |
2067 | * | |
2068 | */ | |
851f306d CM |
2069 | static int dgnc_tty_digigeta(struct tty_struct *tty, |
2070 | struct digi_t __user *retinfo) | |
0b99d589 LL |
2071 | { |
2072 | struct channel_t *ch; | |
2073 | struct un_t *un; | |
2074 | struct digi_t tmp; | |
a44b508a | 2075 | unsigned long flags; |
0b99d589 LL |
2076 | |
2077 | if (!retinfo) | |
8f90ef80 | 2078 | return -EFAULT; |
0b99d589 LL |
2079 | |
2080 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2081 | return -EFAULT; |
0b99d589 LL |
2082 | |
2083 | un = tty->driver_data; | |
2084 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2085 | return -EFAULT; |
0b99d589 LL |
2086 | |
2087 | ch = un->un_ch; | |
2088 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2089 | return -EFAULT; |
0b99d589 LL |
2090 | |
2091 | memset(&tmp, 0, sizeof(tmp)); | |
2092 | ||
a44b508a | 2093 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2094 | memcpy(&tmp, &ch->ch_digi, sizeof(tmp)); |
a44b508a | 2095 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2096 | |
2097 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) | |
8f90ef80 | 2098 | return -EFAULT; |
0b99d589 | 2099 | |
8f90ef80 | 2100 | return 0; |
0b99d589 LL |
2101 | } |
2102 | ||
0b99d589 | 2103 | /* |
8b07d521 | 2104 | * dgnc_tty_digiseta() |
0b99d589 LL |
2105 | * |
2106 | * Ioctl to set the information for ditty. | |
2107 | * | |
2108 | * | |
2109 | * | |
2110 | */ | |
851f306d CM |
2111 | static int dgnc_tty_digiseta(struct tty_struct *tty, |
2112 | struct digi_t __user *new_info) | |
0b99d589 | 2113 | { |
03425f55 | 2114 | struct dgnc_board *bd; |
0b99d589 LL |
2115 | struct channel_t *ch; |
2116 | struct un_t *un; | |
2117 | struct digi_t new_digi; | |
a44b508a | 2118 | unsigned long flags; |
0b99d589 | 2119 | |
0b99d589 | 2120 | if (!tty || tty->magic != TTY_MAGIC) |
8f90ef80 | 2121 | return -EFAULT; |
0b99d589 LL |
2122 | |
2123 | un = tty->driver_data; | |
2124 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2125 | return -EFAULT; |
0b99d589 LL |
2126 | |
2127 | ch = un->un_ch; | |
2128 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2129 | return -EFAULT; |
0b99d589 LL |
2130 | |
2131 | bd = ch->ch_bd; | |
2132 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2133 | return -EFAULT; |
0b99d589 | 2134 | |
f1e51745 | 2135 | if (copy_from_user(&new_digi, new_info, sizeof(new_digi))) |
8f90ef80 | 2136 | return -EFAULT; |
0b99d589 | 2137 | |
a44b508a | 2138 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2139 | |
2140 | /* | |
2141 | * Handle transistions to and from RTS Toggle. | |
2142 | */ | |
851f306d CM |
2143 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2144 | (new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 | 2145 | ch->ch_mostat &= ~(UART_MCR_RTS); |
851f306d CM |
2146 | if ((ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2147 | !(new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 LL |
2148 | ch->ch_mostat |= (UART_MCR_RTS); |
2149 | ||
2150 | /* | |
2151 | * Handle transistions to and from DTR Toggle. | |
2152 | */ | |
851f306d CM |
2153 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2154 | (new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 | 2155 | ch->ch_mostat &= ~(UART_MCR_DTR); |
851f306d CM |
2156 | if ((ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2157 | !(new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 LL |
2158 | ch->ch_mostat |= (UART_MCR_DTR); |
2159 | ||
a07bf39a | 2160 | memcpy(&ch->ch_digi, &new_digi, sizeof(new_digi)); |
0b99d589 | 2161 | |
8b07d521 | 2162 | if (ch->ch_digi.digi_maxcps < 1) |
0b99d589 LL |
2163 | ch->ch_digi.digi_maxcps = 1; |
2164 | ||
8b07d521 | 2165 | if (ch->ch_digi.digi_maxcps > 10000) |
0b99d589 LL |
2166 | ch->ch_digi.digi_maxcps = 10000; |
2167 | ||
2168 | if (ch->ch_digi.digi_bufsize < 10) | |
2169 | ch->ch_digi.digi_bufsize = 10; | |
2170 | ||
2171 | if (ch->ch_digi.digi_maxchar < 1) | |
2172 | ch->ch_digi.digi_maxchar = 1; | |
2173 | ||
2174 | if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize) | |
2175 | ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize; | |
2176 | ||
2177 | if (ch->ch_digi.digi_onlen > DIGI_PLEN) | |
2178 | ch->ch_digi.digi_onlen = DIGI_PLEN; | |
2179 | ||
2180 | if (ch->ch_digi.digi_offlen > DIGI_PLEN) | |
2181 | ch->ch_digi.digi_offlen = DIGI_PLEN; | |
2182 | ||
2183 | ch->ch_bd->bd_ops->param(tty); | |
2184 | ||
a44b508a | 2185 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2186 | |
8f90ef80 | 2187 | return 0; |
0b99d589 LL |
2188 | } |
2189 | ||
0b99d589 LL |
2190 | /* |
2191 | * dgnc_set_termios() | |
2192 | */ | |
851f306d CM |
2193 | static void dgnc_tty_set_termios(struct tty_struct *tty, |
2194 | struct ktermios *old_termios) | |
0b99d589 | 2195 | { |
03425f55 | 2196 | struct dgnc_board *bd; |
0b99d589 LL |
2197 | struct channel_t *ch; |
2198 | struct un_t *un; | |
a44b508a | 2199 | unsigned long flags; |
0b99d589 LL |
2200 | |
2201 | if (!tty || tty->magic != TTY_MAGIC) | |
2202 | return; | |
2203 | ||
2204 | un = tty->driver_data; | |
2205 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2206 | return; | |
2207 | ||
2208 | ch = un->un_ch; | |
2209 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2210 | return; | |
2211 | ||
2212 | bd = ch->ch_bd; | |
2213 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2214 | return; | |
2215 | ||
a44b508a | 2216 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2217 | |
22e3de76 LL |
2218 | ch->ch_c_cflag = tty->termios.c_cflag; |
2219 | ch->ch_c_iflag = tty->termios.c_iflag; | |
2220 | ch->ch_c_oflag = tty->termios.c_oflag; | |
2221 | ch->ch_c_lflag = tty->termios.c_lflag; | |
2222 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
2223 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
2224 | |
2225 | ch->ch_bd->bd_ops->param(tty); | |
2226 | dgnc_carrier(ch); | |
2227 | ||
a44b508a | 2228 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2229 | } |
2230 | ||
0b99d589 LL |
2231 | static void dgnc_tty_throttle(struct tty_struct *tty) |
2232 | { | |
2233 | struct channel_t *ch; | |
2234 | struct un_t *un; | |
a44b508a | 2235 | unsigned long flags; |
0b99d589 LL |
2236 | |
2237 | if (!tty || tty->magic != TTY_MAGIC) | |
2238 | return; | |
2239 | ||
2240 | un = tty->driver_data; | |
2241 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2242 | return; | |
8b07d521 | 2243 | |
90d2a471 LL |
2244 | ch = un->un_ch; |
2245 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2246 | return; | |
0b99d589 | 2247 | |
a44b508a | 2248 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2249 | |
2250 | ch->ch_flags |= (CH_FORCED_STOPI); | |
2251 | ||
a44b508a | 2252 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2253 | } |
2254 | ||
0b99d589 LL |
2255 | static void dgnc_tty_unthrottle(struct tty_struct *tty) |
2256 | { | |
2257 | struct channel_t *ch; | |
2258 | struct un_t *un; | |
a44b508a | 2259 | unsigned long flags; |
0b99d589 LL |
2260 | |
2261 | if (!tty || tty->magic != TTY_MAGIC) | |
2262 | return; | |
2263 | ||
2264 | un = tty->driver_data; | |
2265 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2266 | return; | |
8b07d521 | 2267 | |
90d2a471 LL |
2268 | ch = un->un_ch; |
2269 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2270 | return; | |
0b99d589 | 2271 | |
a44b508a | 2272 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2273 | |
2274 | ch->ch_flags &= ~(CH_FORCED_STOPI); | |
2275 | ||
a44b508a | 2276 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2277 | } |
2278 | ||
0b99d589 LL |
2279 | static void dgnc_tty_start(struct tty_struct *tty) |
2280 | { | |
03425f55 | 2281 | struct dgnc_board *bd; |
0b99d589 LL |
2282 | struct channel_t *ch; |
2283 | struct un_t *un; | |
a44b508a | 2284 | unsigned long flags; |
0b99d589 LL |
2285 | |
2286 | if (!tty || tty->magic != TTY_MAGIC) | |
2287 | return; | |
2288 | ||
2289 | un = tty->driver_data; | |
2290 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2291 | return; | |
8b07d521 | 2292 | |
90d2a471 LL |
2293 | ch = un->un_ch; |
2294 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2295 | return; | |
0b99d589 LL |
2296 | |
2297 | bd = ch->ch_bd; | |
2298 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2299 | return; | |
2300 | ||
a44b508a | 2301 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2302 | |
2303 | ch->ch_flags &= ~(CH_FORCED_STOP); | |
2304 | ||
a44b508a | 2305 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2306 | } |
2307 | ||
0b99d589 LL |
2308 | static void dgnc_tty_stop(struct tty_struct *tty) |
2309 | { | |
03425f55 | 2310 | struct dgnc_board *bd; |
0b99d589 LL |
2311 | struct channel_t *ch; |
2312 | struct un_t *un; | |
a44b508a | 2313 | unsigned long flags; |
0b99d589 LL |
2314 | |
2315 | if (!tty || tty->magic != TTY_MAGIC) | |
2316 | return; | |
2317 | ||
2318 | un = tty->driver_data; | |
2319 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2320 | return; | |
8b07d521 | 2321 | |
90d2a471 LL |
2322 | ch = un->un_ch; |
2323 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2324 | return; | |
0b99d589 LL |
2325 | |
2326 | bd = ch->ch_bd; | |
2327 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2328 | return; | |
2329 | ||
a44b508a | 2330 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2331 | |
2332 | ch->ch_flags |= (CH_FORCED_STOP); | |
2333 | ||
a44b508a | 2334 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2335 | } |
2336 | ||
8b07d521 | 2337 | /* |
0b99d589 LL |
2338 | * dgnc_tty_flush_chars() |
2339 | * | |
2340 | * Flush the cook buffer | |
2341 | * | |
2342 | * Note to self, and any other poor souls who venture here: | |
2343 | * | |
2344 | * flush in this case DOES NOT mean dispose of the data. | |
2345 | * instead, it means "stop buffering and send it if you | |
2346 | * haven't already." Just guess how I figured that out... SRW 2-Jun-98 | |
2347 | * | |
2348 | * It is also always called in interrupt context - JAR 8-Sept-99 | |
2349 | */ | |
2350 | static void dgnc_tty_flush_chars(struct tty_struct *tty) | |
2351 | { | |
03425f55 | 2352 | struct dgnc_board *bd; |
0b99d589 LL |
2353 | struct channel_t *ch; |
2354 | struct un_t *un; | |
a44b508a | 2355 | unsigned long flags; |
0b99d589 LL |
2356 | |
2357 | if (!tty || tty->magic != TTY_MAGIC) | |
2358 | return; | |
2359 | ||
2360 | un = tty->driver_data; | |
2361 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2362 | return; | |
8b07d521 | 2363 | |
90d2a471 LL |
2364 | ch = un->un_ch; |
2365 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2366 | return; | |
0b99d589 LL |
2367 | |
2368 | bd = ch->ch_bd; | |
2369 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2370 | return; | |
2371 | ||
a44b508a | 2372 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2373 | |
2374 | /* Do something maybe here */ | |
2375 | ||
a44b508a | 2376 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2377 | } |
2378 | ||
0b99d589 LL |
2379 | /* |
2380 | * dgnc_tty_flush_buffer() | |
8b07d521 | 2381 | * |
0b99d589 LL |
2382 | * Flush Tx buffer (make in == out) |
2383 | */ | |
2384 | static void dgnc_tty_flush_buffer(struct tty_struct *tty) | |
2385 | { | |
2386 | struct channel_t *ch; | |
2387 | struct un_t *un; | |
a44b508a | 2388 | unsigned long flags; |
0b99d589 LL |
2389 | |
2390 | if (!tty || tty->magic != TTY_MAGIC) | |
2391 | return; | |
2392 | ||
2393 | un = tty->driver_data; | |
2394 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2395 | return; | |
8b07d521 | 2396 | |
90d2a471 LL |
2397 | ch = un->un_ch; |
2398 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2399 | return; | |
0b99d589 | 2400 | |
a44b508a | 2401 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2402 | |
2403 | ch->ch_flags &= ~CH_STOP; | |
2404 | ||
2405 | /* Flush our write queue */ | |
2406 | ch->ch_w_head = ch->ch_w_tail; | |
2407 | ||
2408 | /* Flush UARTs transmit FIFO */ | |
2409 | ch->ch_bd->bd_ops->flush_uart_write(ch); | |
2410 | ||
adcb56f9 RS |
2411 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
2412 | ch->ch_tun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2413 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2414 | } | |
adcb56f9 RS |
2415 | if (ch->ch_pun.un_flags & (UN_LOW | UN_EMPTY)) { |
2416 | ch->ch_pun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2417 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2418 | } | |
2419 | ||
a44b508a | 2420 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2421 | } |
2422 | ||
0b99d589 LL |
2423 | /***************************************************************************** |
2424 | * | |
2425 | * The IOCTL function and all of its helpers | |
2426 | * | |
2427 | *****************************************************************************/ | |
8b07d521 | 2428 | |
0b99d589 LL |
2429 | /* |
2430 | * dgnc_tty_ioctl() | |
2431 | * | |
2432 | * The usual assortment of ioctl's | |
2433 | */ | |
a31cefa2 | 2434 | static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
e352d3f1 | 2435 | unsigned long arg) |
0b99d589 | 2436 | { |
03425f55 | 2437 | struct dgnc_board *bd; |
8670a56f | 2438 | struct board_ops *ch_bd_ops; |
0b99d589 LL |
2439 | struct channel_t *ch; |
2440 | struct un_t *un; | |
2441 | int rc; | |
a44b508a | 2442 | unsigned long flags; |
6f418259 | 2443 | void __user *uarg = (void __user *)arg; |
0b99d589 LL |
2444 | |
2445 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2446 | return -ENODEV; |
0b99d589 LL |
2447 | |
2448 | un = tty->driver_data; | |
2449 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2450 | return -ENODEV; |
0b99d589 LL |
2451 | |
2452 | ch = un->un_ch; | |
2453 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2454 | return -ENODEV; |
0b99d589 LL |
2455 | |
2456 | bd = ch->ch_bd; | |
2457 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2458 | return -ENODEV; |
0b99d589 | 2459 | |
8670a56f DY |
2460 | ch_bd_ops = bd->bd_ops; |
2461 | ||
a44b508a | 2462 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2463 | |
2464 | if (un->un_open_count <= 0) { | |
a44b508a | 2465 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2466 | return -EIO; |
0b99d589 LL |
2467 | } |
2468 | ||
2469 | switch (cmd) { | |
0b99d589 LL |
2470 | /* Here are all the standard ioctl's that we MUST implement */ |
2471 | ||
2472 | case TCSBRK: | |
2473 | /* | |
8b07d521 | 2474 | * TCSBRK is SVID version: non-zero arg --> no break |
0b99d589 LL |
2475 | * this behaviour is exploited by tcdrain(). |
2476 | * | |
2477 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be | |
2478 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2479 | * in the middle: 0.375 seconds. | |
2480 | */ | |
2481 | rc = tty_check_change(tty); | |
a44b508a | 2482 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2483 | if (rc) |
8f90ef80 | 2484 | return rc; |
0b99d589 | 2485 | |
8670a56f | 2486 | rc = ch_bd_ops->drain(tty, 0); |
0b99d589 | 2487 | |
f1e51745 | 2488 | if (rc) |
8f90ef80 | 2489 | return -EINTR; |
0b99d589 | 2490 | |
a44b508a | 2491 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2492 | |
3c4019d3 | 2493 | if (((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP)) |
8670a56f | 2494 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2495 | |
a44b508a | 2496 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2497 | |
8f90ef80 | 2498 | return 0; |
0b99d589 | 2499 | |
0b99d589 | 2500 | case TCSBRKP: |
90d2a471 | 2501 | /* support for POSIX tcsendbreak() |
0b99d589 LL |
2502 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be |
2503 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2504 | * in the middle: 0.375 seconds. | |
2505 | */ | |
2506 | rc = tty_check_change(tty); | |
a44b508a | 2507 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2508 | if (rc) |
8f90ef80 | 2509 | return rc; |
0b99d589 | 2510 | |
8670a56f | 2511 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2512 | if (rc) |
8f90ef80 | 2513 | return -EINTR; |
0b99d589 | 2514 | |
a44b508a | 2515 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2516 | |
8670a56f | 2517 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2518 | |
a44b508a | 2519 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2520 | |
8f90ef80 | 2521 | return 0; |
0b99d589 LL |
2522 | |
2523 | case TIOCSBRK: | |
2524 | rc = tty_check_change(tty); | |
a44b508a | 2525 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2526 | if (rc) |
8f90ef80 | 2527 | return rc; |
0b99d589 | 2528 | |
8670a56f | 2529 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2530 | if (rc) |
8f90ef80 | 2531 | return -EINTR; |
0b99d589 | 2532 | |
a44b508a | 2533 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2534 | |
8670a56f | 2535 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2536 | |
a44b508a | 2537 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2538 | |
8f90ef80 | 2539 | return 0; |
0b99d589 LL |
2540 | |
2541 | case TIOCCBRK: | |
2542 | /* Do Nothing */ | |
a44b508a | 2543 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2544 | return 0; |
2545 | ||
2546 | case TIOCGSOFTCAR: | |
2547 | ||
a44b508a | 2548 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2549 | |
851f306d | 2550 | rc = put_user(C_CLOCAL(tty) ? 1 : 0, |
6f418259 | 2551 | (unsigned long __user *)arg); |
8f90ef80 | 2552 | return rc; |
0b99d589 LL |
2553 | |
2554 | case TIOCSSOFTCAR: | |
2555 | ||
a44b508a | 2556 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2557 | rc = get_user(arg, (unsigned long __user *)arg); |
0b99d589 | 2558 | if (rc) |
8f90ef80 | 2559 | return rc; |
0b99d589 | 2560 | |
a44b508a | 2561 | spin_lock_irqsave(&ch->ch_lock, flags); |
851f306d CM |
2562 | tty->termios.c_cflag = ((tty->termios.c_cflag & ~CLOCAL) | |
2563 | (arg ? CLOCAL : 0)); | |
8670a56f | 2564 | ch_bd_ops->param(tty); |
a44b508a | 2565 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2566 | |
8f90ef80 | 2567 | return 0; |
8b07d521 | 2568 | |
0b99d589 | 2569 | case TIOCMGET: |
a44b508a | 2570 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2571 | return dgnc_get_modem_info(ch, uarg); |
0b99d589 LL |
2572 | |
2573 | case TIOCMBIS: | |
2574 | case TIOCMBIC: | |
2575 | case TIOCMSET: | |
a44b508a | 2576 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
c23b48e0 | 2577 | return dgnc_set_modem_info(ch, cmd, uarg); |
0b99d589 LL |
2578 | |
2579 | /* | |
2580 | * Here are any additional ioctl's that we want to implement | |
2581 | */ | |
8b07d521 LL |
2582 | |
2583 | case TCFLSH: | |
0b99d589 LL |
2584 | /* |
2585 | * The linux tty driver doesn't have a flush | |
2586 | * input routine for the driver, assuming all backed | |
2587 | * up data is in the line disc. buffers. However, | |
2588 | * we all know that's not the case. Here, we | |
2589 | * act on the ioctl, but then lie and say we didn't | |
2590 | * so the line discipline will process the flush | |
2591 | * also. | |
8b07d521 | 2592 | */ |
0b99d589 LL |
2593 | rc = tty_check_change(tty); |
2594 | if (rc) { | |
a44b508a | 2595 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2596 | return rc; |
0b99d589 LL |
2597 | } |
2598 | ||
2599 | if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) { | |
2600 | ch->ch_r_head = ch->ch_r_tail; | |
8670a56f | 2601 | ch_bd_ops->flush_uart_read(ch); |
0b99d589 LL |
2602 | /* Force queue flow control to be released, if needed */ |
2603 | dgnc_check_queue_flow_control(ch); | |
2604 | } | |
2605 | ||
2606 | if ((arg == TCOFLUSH) || (arg == TCIOFLUSH)) { | |
2607 | if (!(un->un_type == DGNC_PRINT)) { | |
2608 | ch->ch_w_head = ch->ch_w_tail; | |
8670a56f | 2609 | ch_bd_ops->flush_uart_write(ch); |
0b99d589 | 2610 | |
24039c58 | 2611 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
851f306d | 2612 | ch->ch_tun.un_flags &= |
adcb56f9 | 2613 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2614 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2615 | } | |
2616 | ||
2617 | if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) { | |
851f306d | 2618 | ch->ch_pun.un_flags &= |
adcb56f9 | 2619 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2620 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2621 | } | |
0b99d589 LL |
2622 | } |
2623 | } | |
2624 | ||
8b07d521 | 2625 | /* pretend we didn't recognize this IOCTL */ |
a44b508a | 2626 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2627 | return -ENOIOCTLCMD; |
0b99d589 LL |
2628 | case TCSETSF: |
2629 | case TCSETSW: | |
2630 | /* | |
2631 | * The linux tty driver doesn't have a flush | |
2632 | * input routine for the driver, assuming all backed | |
2633 | * up data is in the line disc. buffers. However, | |
2634 | * we all know that's not the case. Here, we | |
2635 | * act on the ioctl, but then lie and say we didn't | |
2636 | * so the line discipline will process the flush | |
2637 | * also. | |
2638 | */ | |
2639 | if (cmd == TCSETSF) { | |
2640 | /* flush rx */ | |
2641 | ch->ch_flags &= ~CH_STOP; | |
2642 | ch->ch_r_head = ch->ch_r_tail; | |
8670a56f | 2643 | ch_bd_ops->flush_uart_read(ch); |
0b99d589 LL |
2644 | /* Force queue flow control to be released, if needed */ |
2645 | dgnc_check_queue_flow_control(ch); | |
2646 | } | |
2647 | ||
2648 | /* now wait for all the output to drain */ | |
a44b508a | 2649 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2650 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2651 | if (rc) |
8f90ef80 | 2652 | return -EINTR; |
0b99d589 LL |
2653 | |
2654 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2655 | return -ENOIOCTLCMD; |
0b99d589 LL |
2656 | |
2657 | case TCSETAW: | |
2658 | ||
a44b508a | 2659 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2660 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2661 | if (rc) |
8f90ef80 | 2662 | return -EINTR; |
0b99d589 LL |
2663 | |
2664 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2665 | return -ENOIOCTLCMD; |
0b99d589 LL |
2666 | |
2667 | case TCXONC: | |
a44b508a | 2668 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2669 | /* Make the ld do it */ |
8f90ef80 | 2670 | return -ENOIOCTLCMD; |
0b99d589 LL |
2671 | |
2672 | case DIGI_GETA: | |
2673 | /* get information for ditty */ | |
a44b508a | 2674 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2675 | return dgnc_tty_digigeta(tty, uarg); |
0b99d589 LL |
2676 | |
2677 | case DIGI_SETAW: | |
2678 | case DIGI_SETAF: | |
2679 | ||
2680 | /* set information for ditty */ | |
2681 | if (cmd == (DIGI_SETAW)) { | |
a44b508a | 2682 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2683 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 SL |
2684 | |
2685 | if (rc) | |
8f90ef80 | 2686 | return -EINTR; |
f1e51745 | 2687 | |
a44b508a | 2688 | spin_lock_irqsave(&ch->ch_lock, flags); |
2000c581 | 2689 | } else { |
0b99d589 LL |
2690 | tty_ldisc_flush(tty); |
2691 | } | |
2692 | /* fall thru */ | |
2693 | ||
2694 | case DIGI_SETA: | |
a44b508a | 2695 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2696 | return dgnc_tty_digiseta(tty, uarg); |
8b07d521 | 2697 | |
0b99d589 LL |
2698 | case DIGI_LOOPBACK: |
2699 | { | |
2700 | uint loopback = 0; | |
851f306d CM |
2701 | /* Let go of locks when accessing user space, |
2702 | * could sleep | |
2703 | */ | |
a44b508a | 2704 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2705 | rc = get_user(loopback, (unsigned int __user *)arg); |
0b99d589 | 2706 | if (rc) |
8f90ef80 | 2707 | return rc; |
a44b508a | 2708 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2709 | |
8b07d521 | 2710 | /* Enable/disable internal loopback for this port */ |
0b99d589 LL |
2711 | if (loopback) |
2712 | ch->ch_flags |= CH_LOOPBACK; | |
2713 | else | |
2714 | ch->ch_flags &= ~(CH_LOOPBACK); | |
2715 | ||
8670a56f | 2716 | ch_bd_ops->param(tty); |
a44b508a | 2717 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2718 | return 0; |
90d2a471 | 2719 | } |
0b99d589 LL |
2720 | |
2721 | case DIGI_GETCUSTOMBAUD: | |
a44b508a | 2722 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2723 | rc = put_user(ch->ch_custom_speed, (unsigned int __user *)arg); |
8f90ef80 | 2724 | return rc; |
0b99d589 LL |
2725 | |
2726 | case DIGI_SETCUSTOMBAUD: | |
2727 | { | |
93c76c9c | 2728 | int new_rate; |
0b99d589 | 2729 | /* Let go of locks when accessing user space, could sleep */ |
a44b508a | 2730 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2731 | rc = get_user(new_rate, (int __user *)arg); |
0b99d589 | 2732 | if (rc) |
8f90ef80 | 2733 | return rc; |
a44b508a | 2734 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2735 | dgnc_set_custom_speed(ch, new_rate); |
8670a56f | 2736 | ch_bd_ops->param(tty); |
a44b508a | 2737 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2738 | return 0; |
90d2a471 | 2739 | } |
0b99d589 LL |
2740 | |
2741 | /* | |
2742 | * This ioctl allows insertion of a character into the front | |
2743 | * of any pending data to be transmitted. | |
2744 | * | |
2745 | * This ioctl is to satify the "Send Character Immediate" | |
2746 | * call that the RealPort protocol spec requires. | |
2747 | */ | |
2748 | case DIGI_REALPORT_SENDIMMEDIATE: | |
2749 | { | |
2750 | unsigned char c; | |
0eaa02e6 | 2751 | |
a44b508a | 2752 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2753 | rc = get_user(c, (unsigned char __user *)arg); |
0b99d589 | 2754 | if (rc) |
8f90ef80 | 2755 | return rc; |
a44b508a | 2756 | spin_lock_irqsave(&ch->ch_lock, flags); |
8670a56f | 2757 | ch_bd_ops->send_immediate_char(ch, c); |
a44b508a | 2758 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2759 | return 0; |
0b99d589 LL |
2760 | } |
2761 | ||
2762 | /* | |
2763 | * This ioctl returns all the current counts for the port. | |
2764 | * | |
2765 | * This ioctl is to satify the "Line Error Counters" | |
2766 | * call that the RealPort protocol spec requires. | |
2767 | */ | |
2768 | case DIGI_REALPORT_GETCOUNTERS: | |
2769 | { | |
2770 | struct digi_getcounter buf; | |
2771 | ||
2772 | buf.norun = ch->ch_err_overrun; | |
feba47a7 | 2773 | buf.noflow = 0; /* The driver doesn't keep this stat */ |
0b99d589 LL |
2774 | buf.nframe = ch->ch_err_frame; |
2775 | buf.nparity = ch->ch_err_parity; | |
2776 | buf.nbreak = ch->ch_err_break; | |
2777 | buf.rbytes = ch->ch_rxcount; | |
2778 | buf.tbytes = ch->ch_txcount; | |
2779 | ||
a44b508a | 2780 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2781 | |
50667c67 | 2782 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2783 | return -EFAULT; |
50667c67 | 2784 | |
8f90ef80 | 2785 | return 0; |
0b99d589 LL |
2786 | } |
2787 | ||
2788 | /* | |
2789 | * This ioctl returns all current events. | |
2790 | * | |
2791 | * This ioctl is to satify the "Event Reporting" | |
2792 | * call that the RealPort protocol spec requires. | |
90d2a471 | 2793 | */ |
0b99d589 LL |
2794 | case DIGI_REALPORT_GETEVENTS: |
2795 | { | |
2796 | unsigned int events = 0; | |
2797 | ||
2798 | /* NOTE: MORE EVENTS NEEDS TO BE ADDED HERE */ | |
2799 | if (ch->ch_flags & CH_BREAK_SENDING) | |
2800 | events |= EV_TXB; | |
851f306d CM |
2801 | if ((ch->ch_flags & CH_STOP) || |
2802 | (ch->ch_flags & CH_FORCED_STOP)) | |
0b99d589 | 2803 | events |= (EV_OPU | EV_OPS); |
50667c67 | 2804 | |
851f306d CM |
2805 | if ((ch->ch_flags & CH_STOPI) || |
2806 | (ch->ch_flags & CH_FORCED_STOPI)) | |
0b99d589 | 2807 | events |= (EV_IPU | EV_IPS); |
0b99d589 | 2808 | |
a44b508a | 2809 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2810 | rc = put_user(events, (unsigned int __user *)arg); |
8f90ef80 | 2811 | return rc; |
0b99d589 LL |
2812 | } |
2813 | ||
2814 | /* | |
2815 | * This ioctl returns TOUT and TIN counters based | |
2816 | * upon the values passed in by the RealPort Server. | |
2817 | * It also passes back whether the UART Transmitter is | |
2818 | * empty as well. | |
90d2a471 | 2819 | */ |
0b99d589 LL |
2820 | case DIGI_REALPORT_GETBUFFERS: |
2821 | { | |
2822 | struct digi_getbuffer buf; | |
2823 | int tdist; | |
2824 | int count; | |
2825 | ||
a44b508a | 2826 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2827 | |
2828 | /* | |
2829 | * Get data from user first. | |
2830 | */ | |
50667c67 | 2831 | if (copy_from_user(&buf, uarg, sizeof(buf))) |
8f90ef80 | 2832 | return -EFAULT; |
0b99d589 | 2833 | |
a44b508a | 2834 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2835 | |
2836 | /* | |
2837 | * Figure out how much data is in our RX and TX queues. | |
2838 | */ | |
2839 | buf.rxbuf = (ch->ch_r_head - ch->ch_r_tail) & RQUEUEMASK; | |
2840 | buf.txbuf = (ch->ch_w_head - ch->ch_w_tail) & WQUEUEMASK; | |
2841 | ||
2842 | /* | |
2843 | * Is the UART empty? Add that value to whats in our TX queue. | |
2844 | */ | |
8670a56f | 2845 | count = buf.txbuf + ch_bd_ops->get_uart_bytes_left(ch); |
0b99d589 LL |
2846 | |
2847 | /* | |
2848 | * Figure out how much data the RealPort Server believes should | |
2849 | * be in our TX queue. | |
2850 | */ | |
b9f84637 | 2851 | tdist = (buf.tx_in - buf.tx_out) & 0xffff; |
0b99d589 LL |
2852 | |
2853 | /* | |
2854 | * If we have more data than the RealPort Server believes we | |
2855 | * should have, reduce our count to its amount. | |
2856 | * | |
2857 | * This count difference CAN happen because the Linux LD can | |
2858 | * insert more characters into our queue for OPOST processing | |
2859 | * that the RealPort Server doesn't know about. | |
2860 | */ | |
50667c67 | 2861 | if (buf.txbuf > tdist) |
0b99d589 | 2862 | buf.txbuf = tdist; |
0b99d589 LL |
2863 | |
2864 | /* | |
2865 | * Report whether our queue and UART TX are completely empty. | |
2866 | */ | |
50667c67 | 2867 | if (count) |
0b99d589 | 2868 | buf.txdone = 0; |
50667c67 | 2869 | else |
0b99d589 | 2870 | buf.txdone = 1; |
0b99d589 | 2871 | |
a44b508a | 2872 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2873 | |
50667c67 | 2874 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2875 | return -EFAULT; |
50667c67 | 2876 | |
8f90ef80 | 2877 | return 0; |
0b99d589 LL |
2878 | } |
2879 | default: | |
a44b508a | 2880 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2881 | |
8f90ef80 | 2882 | return -ENOIOCTLCMD; |
0b99d589 | 2883 | } |
0b99d589 | 2884 | } |