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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); | |
851f306d CM |
103 | static int dgnc_set_modem_info(struct tty_struct *tty, unsigned int command, |
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; |
0b99d589 | 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); | |
8b07d521 | 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 | |
60b3109e | 227 | snprintf(brd->print_name, MAXTTYNAMELEN, "pr_dgnc_%d_", brd->boardnum); |
0b99d589 | 228 | |
60b3109e DY |
229 | brd->print_driver->name = brd->print_name; |
230 | brd->print_driver->name_base = 0; | |
231 | brd->print_driver->major = brd->serial_driver->major; | |
232 | brd->print_driver->minor_start = 0x80; | |
233 | brd->print_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
234 | brd->print_driver->subtype = SERIAL_TYPE_NORMAL; | |
235 | brd->print_driver->init_termios = DgncDefaultTermios; | |
236 | brd->print_driver->driver_name = DRVSTR; | |
237 | ||
238 | if (IS_ERR(brd->print_driver)) { | |
239 | rc = PTR_ERR(brd->print_driver); | |
240 | goto unregister_serial_driver; | |
241 | } | |
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 | { | |
03425f55 | 643 | struct dgnc_board *bd; |
0b99d589 | 644 | |
90d2a471 LL |
645 | int virt_carrier = 0; |
646 | int phys_carrier = 0; | |
8b07d521 | 647 | |
0b99d589 LL |
648 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
649 | return; | |
650 | ||
651 | bd = ch->ch_bd; | |
652 | ||
653 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
654 | return; | |
655 | ||
f1e51745 | 656 | if (ch->ch_mistat & UART_MSR_DCD) |
0b99d589 | 657 | phys_carrier = 1; |
0b99d589 | 658 | |
50667c67 | 659 | if (ch->ch_digi.digi_flags & DIGI_FORCEDCD) |
0b99d589 | 660 | virt_carrier = 1; |
0b99d589 | 661 | |
50667c67 | 662 | if (ch->ch_c_cflag & CLOCAL) |
0b99d589 | 663 | virt_carrier = 1; |
0b99d589 | 664 | |
0b99d589 LL |
665 | /* |
666 | * Test for a VIRTUAL carrier transition to HIGH. | |
667 | */ | |
668 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
0b99d589 LL |
669 | /* |
670 | * When carrier rises, wake any threads waiting | |
671 | * for carrier in the open routine. | |
672 | */ | |
673 | ||
7df227c4 | 674 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
675 | wake_up_interruptible(&ch->ch_flags_wait); |
676 | } | |
677 | ||
678 | /* | |
679 | * Test for a PHYSICAL carrier transition to HIGH. | |
680 | */ | |
681 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
0b99d589 LL |
682 | /* |
683 | * When carrier rises, wake any threads waiting | |
684 | * for carrier in the open routine. | |
685 | */ | |
686 | ||
7df227c4 | 687 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
688 | wake_up_interruptible(&ch->ch_flags_wait); |
689 | } | |
690 | ||
691 | /* | |
692 | * Test for a PHYSICAL transition to low, so long as we aren't | |
693 | * currently ignoring physical transitions (which is what "virtual | |
694 | * carrier" indicates). | |
695 | * | |
696 | * The transition of the virtual carrier to low really doesn't | |
697 | * matter... it really only means "ignore carrier state", not | |
698 | * "make pretend that carrier is there". | |
699 | */ | |
700 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) && | |
10352c2a | 701 | (phys_carrier == 0)) { |
0b99d589 LL |
702 | /* |
703 | * When carrier drops: | |
704 | * | |
705 | * Drop carrier on all open units. | |
706 | * | |
707 | * Flush queues, waking up any task waiting in the | |
708 | * line discipline. | |
709 | * | |
710 | * Send a hangup to the control terminal. | |
711 | * | |
712 | * Enable all select calls. | |
713 | */ | |
7df227c4 | 714 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
715 | wake_up_interruptible(&ch->ch_flags_wait); |
716 | ||
f1e51745 | 717 | if (ch->ch_tun.un_open_count > 0) |
0b99d589 | 718 | tty_hangup(ch->ch_tun.un_tty); |
0b99d589 | 719 | |
f1e51745 | 720 | if (ch->ch_pun.un_open_count > 0) |
0b99d589 | 721 | tty_hangup(ch->ch_pun.un_tty); |
0b99d589 LL |
722 | } |
723 | ||
724 | /* | |
725 | * Make sure that our cached values reflect the current reality. | |
726 | */ | |
727 | if (virt_carrier == 1) | |
728 | ch->ch_flags |= CH_FCAR; | |
8b07d521 | 729 | else |
0b99d589 LL |
730 | ch->ch_flags &= ~CH_FCAR; |
731 | ||
732 | if (phys_carrier == 1) | |
733 | ch->ch_flags |= CH_CD; | |
734 | else | |
735 | ch->ch_flags &= ~CH_CD; | |
736 | } | |
737 | ||
738 | /* | |
739 | * Assign the custom baud rate to the channel structure | |
740 | */ | |
741 | static void dgnc_set_custom_speed(struct channel_t *ch, uint newrate) | |
742 | { | |
743 | int testdiv; | |
744 | int testrate_high; | |
8b07d521 | 745 | int testrate_low; |
0b99d589 LL |
746 | int deltahigh; |
747 | int deltalow; | |
748 | ||
93c76c9c DY |
749 | if (newrate <= 0) { |
750 | ch->ch_custom_speed = 0; | |
751 | return; | |
752 | } | |
0b99d589 LL |
753 | |
754 | /* | |
755 | * Since the divisor is stored in a 16-bit integer, we make sure | |
756 | * we don't allow any rates smaller than a 16-bit integer would allow. | |
757 | * And of course, rates above the dividend won't fly. | |
758 | */ | |
759 | if (newrate && newrate < ((ch->ch_bd->bd_dividend / 0xFFFF) + 1)) | |
0b7ceaa6 | 760 | newrate = (ch->ch_bd->bd_dividend / 0xFFFF) + 1; |
0b99d589 LL |
761 | |
762 | if (newrate && newrate > ch->ch_bd->bd_dividend) | |
90d2a471 | 763 | newrate = ch->ch_bd->bd_dividend; |
0b99d589 | 764 | |
93c76c9c | 765 | if (newrate > 0) { |
0b99d589 LL |
766 | testdiv = ch->ch_bd->bd_dividend / newrate; |
767 | ||
768 | /* | |
769 | * If we try to figure out what rate the board would use | |
770 | * with the test divisor, it will be either equal or higher | |
771 | * than the requested baud rate. If we then determine the | |
8b07d521 | 772 | * rate with a divisor one higher, we will get the next lower |
0b99d589 LL |
773 | * supported rate below the requested. |
774 | */ | |
775 | testrate_high = ch->ch_bd->bd_dividend / testdiv; | |
776 | testrate_low = ch->ch_bd->bd_dividend / (testdiv + 1); | |
777 | ||
778 | /* | |
779 | * If the rate for the requested divisor is correct, just | |
780 | * use it and be done. | |
781 | */ | |
93c76c9c DY |
782 | if (testrate_high != newrate) { |
783 | /* | |
851f306d CM |
784 | * Otherwise, pick the rate that is closer |
785 | * (i.e. whichever rate has a smaller delta). | |
93c76c9c DY |
786 | */ |
787 | deltahigh = testrate_high - newrate; | |
788 | deltalow = newrate - testrate_low; | |
0b99d589 | 789 | |
50667c67 | 790 | if (deltahigh < deltalow) |
93c76c9c | 791 | newrate = testrate_high; |
50667c67 | 792 | else |
93c76c9c | 793 | newrate = testrate_low; |
0b99d589 | 794 | } |
0b99d589 | 795 | } |
8b07d521 | 796 | |
0b99d589 | 797 | ch->ch_custom_speed = newrate; |
0b99d589 LL |
798 | } |
799 | ||
0b99d589 LL |
800 | void dgnc_check_queue_flow_control(struct channel_t *ch) |
801 | { | |
d09c1b96 | 802 | int qleft; |
0b99d589 LL |
803 | |
804 | /* Store how much space we have left in the queue */ | |
f7c851d4 CP |
805 | qleft = ch->ch_r_tail - ch->ch_r_head - 1; |
806 | if (qleft < 0) | |
0b99d589 LL |
807 | qleft += RQUEUEMASK + 1; |
808 | ||
809 | /* | |
810 | * Check to see if we should enforce flow control on our queue because | |
811 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
812 | * | |
813 | * NOTE: This is done based on what the current flow control of the | |
814 | * port is set for. | |
815 | * | |
816 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
817 | * This will cause the UART's FIFO to back up, and force | |
818 | * the RTS signal to be dropped. | |
819 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
820 | * the other side, in hopes it will stop sending data to us. | |
821 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
822 | * that gets sent into us when the queue fills up. | |
823 | */ | |
824 | if (qleft < 256) { | |
825 | /* HWFLOW */ | |
851f306d CM |
826 | if (ch->ch_digi.digi_flags & CTSPACE || |
827 | ch->ch_c_cflag & CRTSCTS) { | |
a82477c3 | 828 | if (!(ch->ch_flags & CH_RECEIVER_OFF)) { |
0b99d589 LL |
829 | ch->ch_bd->bd_ops->disable_receiver(ch); |
830 | ch->ch_flags |= (CH_RECEIVER_OFF); | |
0b99d589 LL |
831 | } |
832 | } | |
833 | /* SWFLOW */ | |
834 | else if (ch->ch_c_iflag & IXOFF) { | |
835 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
836 | ch->ch_bd->bd_ops->send_stop_character(ch); | |
837 | ch->ch_stops_sent++; | |
0b99d589 LL |
838 | } |
839 | } | |
0b99d589 LL |
840 | } |
841 | ||
842 | /* | |
843 | * Check to see if we should unenforce flow control because | |
844 | * ld (or user) finally read enuf data out of our queue. | |
845 | * | |
846 | * NOTE: This is done based on what the current flow control of the | |
847 | * port is set for. | |
848 | * | |
849 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
850 | * This will cause the UART's FIFO to raise RTS back up, | |
851 | * which will allow the other side to start sending data again. | |
852 | * 2) SWFLOW (IXOFF) - Send a start character to | |
853 | * the other side, so it will start sending data to us again. | |
854 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
855 | * other side, we don't need to do anything now. | |
856 | */ | |
857 | if (qleft > (RQUEUESIZE / 2)) { | |
858 | /* HWFLOW */ | |
851f306d CM |
859 | if (ch->ch_digi.digi_flags & RTSPACE || |
860 | ch->ch_c_cflag & CRTSCTS) { | |
0b99d589 LL |
861 | if (ch->ch_flags & CH_RECEIVER_OFF) { |
862 | ch->ch_bd->bd_ops->enable_receiver(ch); | |
863 | ch->ch_flags &= ~(CH_RECEIVER_OFF); | |
0b99d589 LL |
864 | } |
865 | } | |
866 | /* SWFLOW */ | |
867 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
868 | ch->ch_stops_sent = 0; | |
869 | ch->ch_bd->bd_ops->send_start_character(ch); | |
0b99d589 | 870 | } |
0b99d589 LL |
871 | } |
872 | } | |
873 | ||
0b99d589 LL |
874 | void dgnc_wakeup_writes(struct channel_t *ch) |
875 | { | |
876 | int qlen = 0; | |
a44b508a | 877 | unsigned long flags; |
0b99d589 LL |
878 | |
879 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
880 | return; | |
881 | ||
a44b508a | 882 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
883 | |
884 | /* | |
885 | * If channel now has space, wake up anyone waiting on the condition. | |
886 | */ | |
f7c851d4 CP |
887 | qlen = ch->ch_w_head - ch->ch_w_tail; |
888 | if (qlen < 0) | |
90d2a471 | 889 | qlen += WQUEUESIZE; |
0b99d589 LL |
890 | |
891 | if (qlen >= (WQUEUESIZE - 256)) { | |
a44b508a | 892 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
893 | return; |
894 | } | |
895 | ||
896 | if (ch->ch_tun.un_flags & UN_ISOPEN) { | |
6aa56785 | 897 | tty_wakeup(ch->ch_tun.un_tty); |
0b99d589 LL |
898 | |
899 | /* | |
900 | * If unit is set to wait until empty, check to make sure | |
901 | * the queue AND FIFO are both empty. | |
902 | */ | |
903 | if (ch->ch_tun.un_flags & UN_EMPTY) { | |
851f306d | 904 | if ((qlen == 0) && |
e352d3f1 | 905 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) { |
0b99d589 LL |
906 | ch->ch_tun.un_flags &= ~(UN_EMPTY); |
907 | ||
908 | /* | |
909 | * If RTS Toggle mode is on, whenever | |
910 | * the queue and UART is empty, keep RTS low. | |
911 | */ | |
912 | if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) { | |
913 | ch->ch_mostat &= ~(UART_MCR_RTS); | |
914 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
915 | } | |
916 | ||
917 | /* | |
918 | * If DTR Toggle mode is on, whenever | |
919 | * the queue and UART is empty, keep DTR low. | |
920 | */ | |
921 | if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) { | |
922 | ch->ch_mostat &= ~(UART_MCR_DTR); | |
923 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
924 | } | |
925 | } | |
926 | } | |
927 | ||
928 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); | |
929 | } | |
930 | ||
931 | if (ch->ch_pun.un_flags & UN_ISOPEN) { | |
6aa56785 | 932 | tty_wakeup(ch->ch_pun.un_tty); |
0b99d589 LL |
933 | |
934 | /* | |
935 | * If unit is set to wait until empty, check to make sure | |
936 | * the queue AND FIFO are both empty. | |
937 | */ | |
938 | if (ch->ch_pun.un_flags & UN_EMPTY) { | |
851f306d CM |
939 | if ((qlen == 0) && |
940 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) | |
0b99d589 | 941 | ch->ch_pun.un_flags &= ~(UN_EMPTY); |
0b99d589 LL |
942 | } |
943 | ||
944 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); | |
945 | } | |
946 | ||
a44b508a | 947 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
948 | } |
949 | ||
0b99d589 | 950 | /************************************************************************ |
8b07d521 | 951 | * |
0b99d589 | 952 | * TTY Entry points and helper functions |
8b07d521 | 953 | * |
0b99d589 LL |
954 | ************************************************************************/ |
955 | ||
956 | /* | |
957 | * dgnc_tty_open() | |
958 | * | |
959 | */ | |
960 | static int dgnc_tty_open(struct tty_struct *tty, struct file *file) | |
961 | { | |
03425f55 | 962 | struct dgnc_board *brd; |
0b99d589 LL |
963 | struct channel_t *ch; |
964 | struct un_t *un; | |
965 | uint major = 0; | |
966 | uint minor = 0; | |
967 | int rc = 0; | |
a44b508a | 968 | unsigned long flags; |
0b99d589 LL |
969 | |
970 | rc = 0; | |
971 | ||
972 | major = MAJOR(tty_devnum(tty)); | |
973 | minor = MINOR(tty_devnum(tty)); | |
974 | ||
50667c67 | 975 | if (major > 255) |
0b99d589 | 976 | return -ENXIO; |
0b99d589 LL |
977 | |
978 | /* Get board pointer from our array of majors we have allocated */ | |
979 | brd = dgnc_BoardsByMajor[major]; | |
50667c67 | 980 | if (!brd) |
0b99d589 | 981 | return -ENXIO; |
0b99d589 LL |
982 | |
983 | /* | |
984 | * If board is not yet up to a state of READY, go to | |
985 | * sleep waiting for it to happen or they cancel the open. | |
986 | */ | |
987 | rc = wait_event_interruptible(brd->state_wait, | |
e352d3f1 | 988 | (brd->state & BOARD_READY)); |
0b99d589 | 989 | |
50667c67 | 990 | if (rc) |
0b99d589 | 991 | return rc; |
0b99d589 | 992 | |
a44b508a | 993 | spin_lock_irqsave(&brd->bd_lock, flags); |
0b99d589 LL |
994 | |
995 | /* If opened device is greater than our number of ports, bail. */ | |
4bef52f3 | 996 | if (PORT_NUM(minor) >= brd->nasync) { |
a44b508a | 997 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
998 | return -ENXIO; |
999 | } | |
1000 | ||
1001 | ch = brd->channels[PORT_NUM(minor)]; | |
1002 | if (!ch) { | |
a44b508a | 1003 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1004 | return -ENXIO; |
1005 | } | |
1006 | ||
1007 | /* Drop board lock */ | |
a44b508a | 1008 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1009 | |
1010 | /* Grab channel lock */ | |
a44b508a | 1011 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1012 | |
1013 | /* Figure out our type */ | |
1014 | if (!IS_PRINT(minor)) { | |
1015 | un = &brd->channels[PORT_NUM(minor)]->ch_tun; | |
1016 | un->un_type = DGNC_SERIAL; | |
2000c581 | 1017 | } else if (IS_PRINT(minor)) { |
0b99d589 LL |
1018 | un = &brd->channels[PORT_NUM(minor)]->ch_pun; |
1019 | un->un_type = DGNC_PRINT; | |
2000c581 | 1020 | } else { |
a44b508a | 1021 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1022 | return -ENXIO; |
1023 | } | |
1024 | ||
1025 | /* | |
1026 | * If the port is still in a previous open, and in a state | |
1027 | * where we simply cannot safely keep going, wait until the | |
1028 | * state clears. | |
1029 | */ | |
a44b508a | 1030 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1031 | |
851f306d CM |
1032 | rc = wait_event_interruptible(ch->ch_flags_wait, |
1033 | ((ch->ch_flags & CH_OPENING) == 0)); | |
0b99d589 LL |
1034 | |
1035 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 1036 | if (rc) |
0b99d589 | 1037 | return -EINTR; |
0b99d589 LL |
1038 | |
1039 | /* | |
1040 | * If either unit is in the middle of the fragile part of close, | |
1041 | * we just cannot touch the channel safely. | |
1042 | * Go to sleep, knowing that when the channel can be | |
1043 | * touched safely, the close routine will signal the | |
1044 | * ch_flags_wait to wake us back up. | |
1045 | */ | |
1046 | rc = wait_event_interruptible(ch->ch_flags_wait, | |
851f306d CM |
1047 | (((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & |
1048 | UN_CLOSING) == 0)); | |
0b99d589 LL |
1049 | |
1050 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 1051 | if (rc) |
0b99d589 | 1052 | return -EINTR; |
0b99d589 | 1053 | |
a44b508a | 1054 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1055 | |
0b99d589 LL |
1056 | /* Store our unit into driver_data, so we always have it available. */ |
1057 | tty->driver_data = un; | |
1058 | ||
0b99d589 LL |
1059 | /* |
1060 | * Initialize tty's | |
1061 | */ | |
1062 | if (!(un->un_flags & UN_ISOPEN)) { | |
1063 | /* Store important variables. */ | |
1064 | un->un_tty = tty; | |
1065 | ||
1066 | /* Maybe do something here to the TTY struct as well? */ | |
1067 | } | |
1068 | ||
0b99d589 LL |
1069 | /* |
1070 | * Allocate channel buffers for read/write/error. | |
1071 | * Set flag, so we don't get trounced on. | |
1072 | */ | |
1073 | ch->ch_flags |= (CH_OPENING); | |
1074 | ||
1075 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
a44b508a | 1076 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1077 | |
1078 | if (!ch->ch_rqueue) | |
52f9d668 | 1079 | ch->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1080 | if (!ch->ch_equeue) |
52f9d668 | 1081 | ch->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1082 | if (!ch->ch_wqueue) |
52f9d668 | 1083 | ch->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1084 | |
16f10a82 DY |
1085 | if (!ch->ch_rqueue || !ch->ch_equeue || !ch->ch_wqueue) { |
1086 | kfree(ch->ch_rqueue); | |
1087 | kfree(ch->ch_equeue); | |
1088 | kfree(ch->ch_wqueue); | |
1089 | ||
1090 | return -ENOMEM; | |
1091 | } | |
1092 | ||
a44b508a | 1093 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1094 | |
1095 | ch->ch_flags &= ~(CH_OPENING); | |
1096 | wake_up_interruptible(&ch->ch_flags_wait); | |
1097 | ||
1098 | /* | |
1099 | * Initialize if neither terminal or printer is open. | |
1100 | */ | |
1101 | if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_ISOPEN)) { | |
0b99d589 LL |
1102 | /* |
1103 | * Flush input queues. | |
1104 | */ | |
587abd7b SL |
1105 | ch->ch_r_head = 0; |
1106 | ch->ch_r_tail = 0; | |
1107 | ch->ch_e_head = 0; | |
1108 | ch->ch_e_tail = 0; | |
1109 | ch->ch_w_head = 0; | |
1110 | ch->ch_w_tail = 0; | |
0b99d589 LL |
1111 | |
1112 | brd->bd_ops->flush_uart_write(ch); | |
1113 | brd->bd_ops->flush_uart_read(ch); | |
1114 | ||
1115 | ch->ch_flags = 0; | |
1116 | ch->ch_cached_lsr = 0; | |
1117 | ch->ch_stop_sending_break = 0; | |
1118 | ch->ch_stops_sent = 0; | |
1119 | ||
22e3de76 LL |
1120 | ch->ch_c_cflag = tty->termios.c_cflag; |
1121 | ch->ch_c_iflag = tty->termios.c_iflag; | |
1122 | ch->ch_c_oflag = tty->termios.c_oflag; | |
1123 | ch->ch_c_lflag = tty->termios.c_lflag; | |
1124 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
1125 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
1126 | |
1127 | /* | |
1128 | * Bring up RTS and DTR... | |
1129 | * Also handle RTS or DTR toggle if set. | |
1130 | */ | |
1131 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
1132 | ch->ch_mostat |= (UART_MCR_RTS); | |
1133 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
1134 | ch->ch_mostat |= (UART_MCR_DTR); | |
1135 | ||
1136 | /* Tell UART to init itself */ | |
1137 | brd->bd_ops->uart_init(ch); | |
1138 | } | |
1139 | ||
1140 | /* | |
1141 | * Run param in case we changed anything | |
1142 | */ | |
1143 | brd->bd_ops->param(tty); | |
1144 | ||
1145 | dgnc_carrier(ch); | |
1146 | ||
8b07d521 | 1147 | /* |
0b99d589 LL |
1148 | * follow protocol for opening port |
1149 | */ | |
1150 | ||
a44b508a | 1151 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1152 | |
1153 | rc = dgnc_block_til_ready(tty, file, ch); | |
1154 | ||
0b99d589 | 1155 | /* No going back now, increment our unit and channel counters */ |
a44b508a | 1156 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1157 | ch->ch_open_count++; |
1158 | un->un_open_count++; | |
1159 | un->un_flags |= (UN_ISOPEN); | |
a44b508a | 1160 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1161 | |
8f90ef80 | 1162 | return rc; |
0b99d589 LL |
1163 | } |
1164 | ||
8b07d521 | 1165 | /* |
0b99d589 LL |
1166 | * dgnc_block_til_ready() |
1167 | * | |
1168 | * Wait for DCD, if needed. | |
1169 | */ | |
851f306d CM |
1170 | static int dgnc_block_til_ready(struct tty_struct *tty, |
1171 | struct file *file, | |
1172 | struct channel_t *ch) | |
8b07d521 | 1173 | { |
0b99d589 LL |
1174 | int retval = 0; |
1175 | struct un_t *un = NULL; | |
a44b508a | 1176 | unsigned long flags; |
0b99d589 LL |
1177 | uint old_flags = 0; |
1178 | int sleep_on_un_flags = 0; | |
1179 | ||
851f306d CM |
1180 | if (!tty || tty->magic != TTY_MAGIC || !file || !ch || |
1181 | ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1182 | return -ENXIO; |
0b99d589 LL |
1183 | |
1184 | un = tty->driver_data; | |
50667c67 | 1185 | if (!un || un->magic != DGNC_UNIT_MAGIC) |
8f90ef80 | 1186 | return -ENXIO; |
0b99d589 | 1187 | |
a44b508a | 1188 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1189 | |
1190 | ch->ch_wopen++; | |
1191 | ||
1192 | /* Loop forever */ | |
1193 | while (1) { | |
0b99d589 LL |
1194 | sleep_on_un_flags = 0; |
1195 | ||
1196 | /* | |
851f306d CM |
1197 | * If board has failed somehow during our sleep, |
1198 | * bail with error. | |
0b99d589 LL |
1199 | */ |
1200 | if (ch->ch_bd->state == BOARD_FAILED) { | |
1201 | retval = -ENXIO; | |
1202 | break; | |
1203 | } | |
1204 | ||
1205 | /* If tty was hung up, break out of loop and set error. */ | |
1206 | if (tty_hung_up_p(file)) { | |
1207 | retval = -EAGAIN; | |
1208 | break; | |
1209 | } | |
1210 | ||
1211 | /* | |
1212 | * If either unit is in the middle of the fragile part of close, | |
1213 | * we just cannot touch the channel safely. | |
1214 | * Go back to sleep, knowing that when the channel can be | |
8b07d521 | 1215 | * touched safely, the close routine will signal the |
0b99d589 LL |
1216 | * ch_wait_flags to wake us back up. |
1217 | */ | |
851f306d CM |
1218 | if (!((ch->ch_tun.un_flags | |
1219 | ch->ch_pun.un_flags) & | |
1220 | UN_CLOSING)) { | |
0b99d589 LL |
1221 | /* |
1222 | * Our conditions to leave cleanly and happily: | |
1223 | * 1) NONBLOCKING on the tty is set. | |
1224 | * 2) CLOCAL is set. | |
1225 | * 3) DCD (fake or real) is active. | |
1226 | */ | |
1227 | ||
50667c67 | 1228 | if (file->f_flags & O_NONBLOCK) |
0b99d589 | 1229 | break; |
0b99d589 LL |
1230 | |
1231 | if (tty->flags & (1 << TTY_IO_ERROR)) { | |
1232 | retval = -EIO; | |
1233 | break; | |
1234 | } | |
1235 | ||
f1e51745 | 1236 | if (ch->ch_flags & CH_CD) |
0b99d589 | 1237 | break; |
0b99d589 | 1238 | |
f1e51745 | 1239 | if (ch->ch_flags & CH_FCAR) |
0b99d589 | 1240 | break; |
2000c581 | 1241 | } else { |
0b99d589 LL |
1242 | sleep_on_un_flags = 1; |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * If there is a signal pending, the user probably | |
1247 | * interrupted (ctrl-c) us. | |
1248 | * Leave loop with error set. | |
1249 | */ | |
1250 | if (signal_pending(current)) { | |
0b99d589 LL |
1251 | retval = -ERESTARTSYS; |
1252 | break; | |
1253 | } | |
1254 | ||
0b99d589 LL |
1255 | /* |
1256 | * Store the flags before we let go of channel lock | |
1257 | */ | |
1258 | if (sleep_on_un_flags) | |
1259 | old_flags = ch->ch_tun.un_flags | ch->ch_pun.un_flags; | |
1260 | else | |
1261 | old_flags = ch->ch_flags; | |
1262 | ||
1263 | /* | |
1264 | * Let go of channel lock before calling schedule. | |
1265 | * Our poller will get any FEP events and wake us up when DCD | |
1266 | * eventually goes active. | |
1267 | */ | |
1268 | ||
a44b508a | 1269 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1270 | |
0b99d589 | 1271 | /* |
851f306d CM |
1272 | * Wait for something in the flags to change |
1273 | * from the current value. | |
0b99d589 | 1274 | */ |
50667c67 | 1275 | if (sleep_on_un_flags) |
0b99d589 | 1276 | retval = wait_event_interruptible(un->un_flags_wait, |
851f306d CM |
1277 | (old_flags != (ch->ch_tun.un_flags | |
1278 | ch->ch_pun.un_flags))); | |
50667c67 | 1279 | else |
0b99d589 LL |
1280 | retval = wait_event_interruptible(ch->ch_flags_wait, |
1281 | (old_flags != ch->ch_flags)); | |
0b99d589 | 1282 | |
0b99d589 LL |
1283 | /* |
1284 | * We got woken up for some reason. | |
1285 | * Before looping around, grab our channel lock. | |
1286 | */ | |
a44b508a | 1287 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1288 | } |
1289 | ||
1290 | ch->ch_wopen--; | |
1291 | ||
a44b508a | 1292 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1293 | |
36e712a8 | 1294 | return retval; |
0b99d589 LL |
1295 | } |
1296 | ||
0b99d589 LL |
1297 | /* |
1298 | * dgnc_tty_hangup() | |
1299 | * | |
1300 | * Hangup the port. Like a close, but don't wait for output to drain. | |
8b07d521 | 1301 | */ |
0b99d589 LL |
1302 | static void dgnc_tty_hangup(struct tty_struct *tty) |
1303 | { | |
1304 | struct un_t *un; | |
1305 | ||
1306 | if (!tty || tty->magic != TTY_MAGIC) | |
1307 | return; | |
1308 | ||
1309 | un = tty->driver_data; | |
1310 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1311 | return; | |
1312 | ||
0b99d589 LL |
1313 | /* flush the transmit queues */ |
1314 | dgnc_tty_flush_buffer(tty); | |
0b99d589 LL |
1315 | } |
1316 | ||
0b99d589 LL |
1317 | /* |
1318 | * dgnc_tty_close() | |
1319 | * | |
1320 | */ | |
1321 | static void dgnc_tty_close(struct tty_struct *tty, struct file *file) | |
1322 | { | |
03425f55 | 1323 | struct dgnc_board *bd; |
0b99d589 LL |
1324 | struct channel_t *ch; |
1325 | struct un_t *un; | |
a44b508a | 1326 | unsigned long flags; |
0b99d589 LL |
1327 | |
1328 | if (!tty || tty->magic != TTY_MAGIC) | |
1329 | return; | |
1330 | ||
1331 | un = tty->driver_data; | |
1332 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1333 | return; | |
1334 | ||
1335 | ch = un->un_ch; | |
1336 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1337 | return; | |
1338 | ||
1339 | bd = ch->ch_bd; | |
1340 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1341 | return; | |
1342 | ||
a44b508a | 1343 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1344 | |
1345 | /* | |
1346 | * Determine if this is the last close or not - and if we agree about | |
1347 | * which type of close it is with the Line Discipline | |
1348 | */ | |
1349 | if ((tty->count == 1) && (un->un_open_count != 1)) { | |
1350 | /* | |
1351 | * Uh, oh. tty->count is 1, which means that the tty | |
1352 | * structure will be freed. un_open_count should always | |
1353 | * be one in these conditions. If it's greater than | |
1354 | * one, we've got real problems, since it means the | |
1355 | * serial port won't be shutdown. | |
1356 | */ | |
1f26adc9 RD |
1357 | dev_dbg(tty->dev, |
1358 | "tty->count is 1, un open count is %d\n", | |
1359 | un->un_open_count); | |
0b99d589 | 1360 | un->un_open_count = 1; |
8b07d521 | 1361 | } |
0b99d589 | 1362 | |
3098e514 DY |
1363 | if (un->un_open_count) |
1364 | un->un_open_count--; | |
1365 | else | |
1f26adc9 RD |
1366 | dev_dbg(tty->dev, |
1367 | "bad serial port open count of %d\n", | |
1368 | un->un_open_count); | |
0b99d589 LL |
1369 | |
1370 | ch->ch_open_count--; | |
1371 | ||
1372 | if (ch->ch_open_count && un->un_open_count) { | |
a44b508a | 1373 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
90d2a471 LL |
1374 | return; |
1375 | } | |
0b99d589 LL |
1376 | |
1377 | /* OK, its the last close on the unit */ | |
0b99d589 LL |
1378 | un->un_flags |= UN_CLOSING; |
1379 | ||
1380 | tty->closing = 1; | |
1381 | ||
0b99d589 LL |
1382 | /* |
1383 | * Only officially close channel if count is 0 and | |
90d2a471 | 1384 | * DIGI_PRINTER bit is not set. |
0b99d589 | 1385 | */ |
851f306d CM |
1386 | if ((ch->ch_open_count == 0) && |
1387 | !(ch->ch_digi.digi_flags & DIGI_PRINTER)) { | |
0b99d589 LL |
1388 | ch->ch_flags &= ~(CH_STOPI | CH_FORCED_STOPI); |
1389 | ||
1390 | /* | |
1391 | * turn off print device when closing print device. | |
1392 | */ | |
9cdf838b | 1393 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1394 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1395 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1396 | ch->ch_flags &= ~CH_PRON; |
1397 | } | |
1398 | ||
a44b508a | 1399 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1400 | /* wait for output to drain */ |
1401 | /* This will also return if we take an interrupt */ | |
1402 | ||
2d9920ec | 1403 | bd->bd_ops->drain(tty, 0); |
0b99d589 | 1404 | |
0b99d589 LL |
1405 | dgnc_tty_flush_buffer(tty); |
1406 | tty_ldisc_flush(tty); | |
1407 | ||
a44b508a | 1408 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1409 | |
1410 | tty->closing = 0; | |
1411 | ||
1412 | /* | |
1413 | * If we have HUPCL set, lower DTR and RTS | |
1414 | */ | |
1415 | if (ch->ch_c_cflag & HUPCL) { | |
0b99d589 LL |
1416 | /* Drop RTS/DTR */ |
1417 | ch->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
1418 | bd->bd_ops->assert_modem_signals(ch); | |
1419 | ||
1420 | /* | |
8b07d521 | 1421 | * Go to sleep to ensure RTS/DTR |
0b99d589 LL |
1422 | * have been dropped for modems to see it. |
1423 | */ | |
1424 | if (ch->ch_close_delay) { | |
a44b508a RD |
1425 | spin_unlock_irqrestore(&ch->ch_lock, |
1426 | flags); | |
0b99d589 | 1427 | dgnc_ms_sleep(ch->ch_close_delay); |
a44b508a | 1428 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1429 | } |
1430 | } | |
1431 | ||
1432 | ch->ch_old_baud = 0; | |
1433 | ||
1434 | /* Turn off UART interrupts for this port */ | |
1435 | ch->ch_bd->bd_ops->uart_off(ch); | |
2000c581 | 1436 | } else { |
0b99d589 LL |
1437 | /* |
1438 | * turn off print device when closing print device. | |
1439 | */ | |
9cdf838b | 1440 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1441 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1442 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1443 | ch->ch_flags &= ~CH_PRON; |
1444 | } | |
1445 | } | |
1446 | ||
1447 | un->un_tty = NULL; | |
1448 | un->un_flags &= ~(UN_ISOPEN | UN_CLOSING); | |
1449 | ||
0b99d589 LL |
1450 | wake_up_interruptible(&ch->ch_flags_wait); |
1451 | wake_up_interruptible(&un->un_flags_wait); | |
1452 | ||
a44b508a | 1453 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1454 | } |
1455 | ||
0b99d589 LL |
1456 | /* |
1457 | * dgnc_tty_chars_in_buffer() | |
1458 | * | |
1459 | * Return number of characters that have not been transmitted yet. | |
1460 | * | |
1461 | * This routine is used by the line discipline to determine if there | |
1462 | * is data waiting to be transmitted/drained/flushed or not. | |
1463 | */ | |
1464 | static int dgnc_tty_chars_in_buffer(struct tty_struct *tty) | |
1465 | { | |
1466 | struct channel_t *ch = NULL; | |
1467 | struct un_t *un = NULL; | |
1468 | ushort thead; | |
1469 | ushort ttail; | |
1470 | uint tmask; | |
1471 | uint chars = 0; | |
a44b508a | 1472 | unsigned long flags; |
0b99d589 | 1473 | |
60acb623 | 1474 | if (!tty) |
8f90ef80 | 1475 | return 0; |
0b99d589 LL |
1476 | |
1477 | un = tty->driver_data; | |
1478 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1479 | return 0; |
0b99d589 LL |
1480 | |
1481 | ch = un->un_ch; | |
1482 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1483 | return 0; |
0b99d589 | 1484 | |
a44b508a | 1485 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1486 | |
1487 | tmask = WQUEUEMASK; | |
1488 | thead = ch->ch_w_head & tmask; | |
1489 | ttail = ch->ch_w_tail & tmask; | |
1490 | ||
a44b508a | 1491 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1492 | |
1493 | if (ttail == thead) { | |
1494 | chars = 0; | |
1495 | } else { | |
1496 | if (thead >= ttail) | |
1497 | chars = thead - ttail; | |
1498 | else | |
1499 | chars = thead - ttail + WQUEUESIZE; | |
1500 | } | |
1501 | ||
8f90ef80 | 1502 | return chars; |
0b99d589 LL |
1503 | } |
1504 | ||
8b07d521 | 1505 | /* |
0b99d589 LL |
1506 | * dgnc_maxcps_room |
1507 | * | |
1508 | * Reduces bytes_available to the max number of characters | |
1509 | * that can be sent currently given the maxcps value, and | |
1510 | * returns the new bytes_available. This only affects printer | |
1511 | * output. | |
8b07d521 | 1512 | */ |
0b99d589 LL |
1513 | static int dgnc_maxcps_room(struct tty_struct *tty, int bytes_available) |
1514 | { | |
e47e7379 DY |
1515 | struct un_t *un = tty->driver_data; |
1516 | struct channel_t *ch = un->un_ch; | |
0b99d589 LL |
1517 | |
1518 | /* | |
1519 | * If its not the Transparent print device, return | |
1520 | * the full data amount. | |
1521 | */ | |
1522 | if (un->un_type != DGNC_PRINT) | |
8f90ef80 | 1523 | return bytes_available; |
0b99d589 | 1524 | |
9cdf838b | 1525 | if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0) { |
0b99d589 LL |
1526 | int cps_limit = 0; |
1527 | unsigned long current_time = jiffies; | |
1528 | unsigned long buffer_time = current_time + | |
851f306d CM |
1529 | (HZ * ch->ch_digi.digi_bufsize) / |
1530 | ch->ch_digi.digi_maxcps; | |
0b99d589 LL |
1531 | |
1532 | if (ch->ch_cpstime < current_time) { | |
1533 | /* buffer is empty */ | |
851f306d | 1534 | ch->ch_cpstime = current_time; /* reset ch_cpstime */ |
0b99d589 | 1535 | cps_limit = ch->ch_digi.digi_bufsize; |
2000c581 | 1536 | } else if (ch->ch_cpstime < buffer_time) { |
0b99d589 | 1537 | /* still room in the buffer */ |
851f306d CM |
1538 | cps_limit = ((buffer_time - ch->ch_cpstime) * |
1539 | ch->ch_digi.digi_maxcps) / HZ; | |
2000c581 | 1540 | } else { |
0b99d589 | 1541 | /* no room in the buffer */ |
8b07d521 | 1542 | cps_limit = 0; |
0b99d589 LL |
1543 | } |
1544 | ||
1545 | bytes_available = min(cps_limit, bytes_available); | |
1546 | } | |
1547 | ||
8f90ef80 | 1548 | return bytes_available; |
0b99d589 LL |
1549 | } |
1550 | ||
0b99d589 LL |
1551 | /* |
1552 | * dgnc_tty_write_room() | |
1553 | * | |
1554 | * Return space available in Tx buffer | |
8b07d521 | 1555 | */ |
0b99d589 LL |
1556 | static int dgnc_tty_write_room(struct tty_struct *tty) |
1557 | { | |
1558 | struct channel_t *ch = NULL; | |
1559 | struct un_t *un = NULL; | |
1560 | ushort head; | |
1561 | ushort tail; | |
1562 | ushort tmask; | |
1563 | int ret = 0; | |
a44b508a | 1564 | unsigned long flags; |
0b99d589 | 1565 | |
60acb623 | 1566 | if (!tty || !dgnc_TmpWriteBuf) |
8f90ef80 | 1567 | return 0; |
0b99d589 LL |
1568 | |
1569 | un = tty->driver_data; | |
1570 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1571 | return 0; |
0b99d589 LL |
1572 | |
1573 | ch = un->un_ch; | |
1574 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1575 | return 0; |
0b99d589 | 1576 | |
a44b508a | 1577 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1578 | |
1579 | tmask = WQUEUEMASK; | |
1580 | head = (ch->ch_w_head) & tmask; | |
1581 | tail = (ch->ch_w_tail) & tmask; | |
1582 | ||
f7c851d4 CP |
1583 | ret = tail - head - 1; |
1584 | if (ret < 0) | |
0b99d589 LL |
1585 | ret += WQUEUESIZE; |
1586 | ||
1587 | /* Limit printer to maxcps */ | |
1588 | ret = dgnc_maxcps_room(tty, ret); | |
1589 | ||
1590 | /* | |
8b07d521 | 1591 | * If we are printer device, leave space for |
0b99d589 LL |
1592 | * possibly both the on and off strings. |
1593 | */ | |
1594 | if (un->un_type == DGNC_PRINT) { | |
1595 | if (!(ch->ch_flags & CH_PRON)) | |
1596 | ret -= ch->ch_digi.digi_onlen; | |
1597 | ret -= ch->ch_digi.digi_offlen; | |
2000c581 | 1598 | } else { |
0b99d589 LL |
1599 | if (ch->ch_flags & CH_PRON) |
1600 | ret -= ch->ch_digi.digi_offlen; | |
1601 | } | |
1602 | ||
1603 | if (ret < 0) | |
1604 | ret = 0; | |
1605 | ||
a44b508a | 1606 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8b07d521 | 1607 | |
8f90ef80 | 1608 | return ret; |
0b99d589 LL |
1609 | } |
1610 | ||
0b99d589 LL |
1611 | /* |
1612 | * dgnc_tty_put_char() | |
1613 | * | |
1614 | * Put a character into ch->ch_buf | |
8b07d521 | 1615 | * |
0b99d589 LL |
1616 | * - used by the line discipline for OPOST processing |
1617 | */ | |
1618 | static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c) | |
1619 | { | |
1620 | /* | |
1621 | * Simply call tty_write. | |
1622 | */ | |
0b99d589 LL |
1623 | dgnc_tty_write(tty, &c, 1); |
1624 | return 1; | |
1625 | } | |
1626 | ||
0b99d589 LL |
1627 | /* |
1628 | * dgnc_tty_write() | |
1629 | * | |
1630 | * Take data from the user or kernel and send it out to the FEP. | |
1631 | * In here exists all the Transparent Print magic as well. | |
1632 | */ | |
1633 | static int dgnc_tty_write(struct tty_struct *tty, | |
e352d3f1 | 1634 | const unsigned char *buf, int count) |
0b99d589 LL |
1635 | { |
1636 | struct channel_t *ch = NULL; | |
1637 | struct un_t *un = NULL; | |
1638 | int bufcount = 0, n = 0; | |
a44b508a | 1639 | unsigned long flags; |
0b99d589 LL |
1640 | ushort head; |
1641 | ushort tail; | |
1642 | ushort tmask; | |
1643 | uint remain; | |
0b99d589 | 1644 | |
60acb623 | 1645 | if (!tty || !dgnc_TmpWriteBuf) |
8f90ef80 | 1646 | return 0; |
0b99d589 LL |
1647 | |
1648 | un = tty->driver_data; | |
1649 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1650 | return 0; |
0b99d589 LL |
1651 | |
1652 | ch = un->un_ch; | |
1653 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1654 | return 0; |
0b99d589 LL |
1655 | |
1656 | if (!count) | |
8f90ef80 | 1657 | return 0; |
0b99d589 | 1658 | |
0b99d589 LL |
1659 | /* |
1660 | * Store original amount of characters passed in. | |
1661 | * This helps to figure out if we should ask the FEP | |
1662 | * to send us an event when it has more space available. | |
1663 | */ | |
0b99d589 | 1664 | |
a44b508a | 1665 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1666 | |
1667 | /* Get our space available for the channel from the board */ | |
1668 | tmask = WQUEUEMASK; | |
1669 | head = (ch->ch_w_head) & tmask; | |
1670 | tail = (ch->ch_w_tail) & tmask; | |
1671 | ||
f7c851d4 CP |
1672 | bufcount = tail - head - 1; |
1673 | if (bufcount < 0) | |
0b99d589 LL |
1674 | bufcount += WQUEUESIZE; |
1675 | ||
0b99d589 LL |
1676 | /* |
1677 | * Limit printer output to maxcps overall, with bursts allowed | |
1678 | * up to bufsize characters. | |
1679 | */ | |
1680 | bufcount = dgnc_maxcps_room(tty, bufcount); | |
1681 | ||
1682 | /* | |
1683 | * Take minimum of what the user wants to send, and the | |
1684 | * space available in the FEP buffer. | |
1685 | */ | |
1686 | count = min(count, bufcount); | |
1687 | ||
1688 | /* | |
1689 | * Bail if no space left. | |
1690 | */ | |
c84a083b QL |
1691 | if (count <= 0) |
1692 | goto exit_retry; | |
0b99d589 LL |
1693 | |
1694 | /* | |
1695 | * Output the printer ON string, if we are in terminal mode, but | |
1696 | * need to be in printer mode. | |
1697 | */ | |
1698 | if ((un->un_type == DGNC_PRINT) && !(ch->ch_flags & CH_PRON)) { | |
1699 | dgnc_wmove(ch, ch->ch_digi.digi_onstr, | |
e352d3f1 | 1700 | (int)ch->ch_digi.digi_onlen); |
0b99d589 LL |
1701 | head = (ch->ch_w_head) & tmask; |
1702 | ch->ch_flags |= CH_PRON; | |
1703 | } | |
1704 | ||
1705 | /* | |
1706 | * On the other hand, output the printer OFF string, if we are | |
1707 | * currently in printer mode, but need to output to the terminal. | |
1708 | */ | |
1709 | if ((un->un_type != DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { | |
1710 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, | |
e352d3f1 | 1711 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1712 | head = (ch->ch_w_head) & tmask; |
1713 | ch->ch_flags &= ~CH_PRON; | |
1714 | } | |
1715 | ||
0b99d589 LL |
1716 | n = count; |
1717 | ||
1718 | /* | |
1719 | * If the write wraps over the top of the circular buffer, | |
1720 | * move the portion up to the wrap point, and reset the | |
1721 | * pointers to the bottom. | |
1722 | */ | |
1723 | remain = WQUEUESIZE - head; | |
1724 | ||
1725 | if (n >= remain) { | |
1726 | n -= remain; | |
1727 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1728 | head = 0; |
1729 | buf += remain; | |
1730 | } | |
1731 | ||
1732 | if (n > 0) { | |
1733 | /* | |
1734 | * Move rest of data. | |
1735 | */ | |
1736 | remain = n; | |
1737 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1738 | head += remain; |
1739 | } | |
1740 | ||
1741 | if (count) { | |
1742 | head &= tmask; | |
1743 | ch->ch_w_head = head; | |
1744 | } | |
1745 | ||
0b99d589 | 1746 | /* Update printer buffer empty time. */ |
8d0d4cc5 RS |
1747 | if ((un->un_type == DGNC_PRINT) && (ch->ch_digi.digi_maxcps > 0) && |
1748 | (ch->ch_digi.digi_bufsize > 0)) { | |
90d2a471 | 1749 | ch->ch_cpstime += (HZ * count) / ch->ch_digi.digi_maxcps; |
0b99d589 LL |
1750 | } |
1751 | ||
a74d8e21 | 1752 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1753 | |
0b99d589 LL |
1754 | if (count) { |
1755 | /* | |
1756 | * Channel lock is grabbed and then released | |
1757 | * inside this routine. | |
1758 | */ | |
1759 | ch->ch_bd->bd_ops->copy_data_from_queue_to_uart(ch); | |
1760 | } | |
1761 | ||
8f90ef80 | 1762 | return count; |
c84a083b QL |
1763 | |
1764 | exit_retry: | |
1765 | ||
1766 | spin_unlock_irqrestore(&ch->ch_lock, flags); | |
1767 | return 0; | |
0b99d589 LL |
1768 | } |
1769 | ||
0b99d589 LL |
1770 | /* |
1771 | * Return modem signals to ld. | |
1772 | */ | |
b74c7461 | 1773 | |
0b99d589 | 1774 | static int dgnc_tty_tiocmget(struct tty_struct *tty) |
0b99d589 LL |
1775 | { |
1776 | struct channel_t *ch; | |
1777 | struct un_t *un; | |
1778 | int result = -EIO; | |
446393e9 | 1779 | unsigned char mstat = 0; |
a44b508a | 1780 | unsigned long flags; |
0b99d589 LL |
1781 | |
1782 | if (!tty || tty->magic != TTY_MAGIC) | |
1783 | return result; | |
1784 | ||
1785 | un = tty->driver_data; | |
1786 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1787 | return result; | |
1788 | ||
1789 | ch = un->un_ch; | |
1790 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1791 | return result; | |
1792 | ||
a44b508a | 1793 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1794 | |
0b7ceaa6 | 1795 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1796 | |
a44b508a | 1797 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1798 | |
1799 | result = 0; | |
1800 | ||
1801 | if (mstat & UART_MCR_DTR) | |
1802 | result |= TIOCM_DTR; | |
1803 | if (mstat & UART_MCR_RTS) | |
1804 | result |= TIOCM_RTS; | |
1805 | if (mstat & UART_MSR_CTS) | |
1806 | result |= TIOCM_CTS; | |
1807 | if (mstat & UART_MSR_DSR) | |
1808 | result |= TIOCM_DSR; | |
1809 | if (mstat & UART_MSR_RI) | |
1810 | result |= TIOCM_RI; | |
1811 | if (mstat & UART_MSR_DCD) | |
1812 | result |= TIOCM_CD; | |
1813 | ||
0b99d589 LL |
1814 | return result; |
1815 | } | |
1816 | ||
0b99d589 LL |
1817 | /* |
1818 | * dgnc_tty_tiocmset() | |
1819 | * | |
1820 | * Set modem signals, called by ld. | |
1821 | */ | |
b74c7461 | 1822 | |
0b99d589 | 1823 | static int dgnc_tty_tiocmset(struct tty_struct *tty, |
e352d3f1 | 1824 | unsigned int set, unsigned int clear) |
0b99d589 | 1825 | { |
03425f55 | 1826 | struct dgnc_board *bd; |
0b99d589 LL |
1827 | struct channel_t *ch; |
1828 | struct un_t *un; | |
1829 | int ret = -EIO; | |
a44b508a | 1830 | unsigned long flags; |
0b99d589 LL |
1831 | |
1832 | if (!tty || tty->magic != TTY_MAGIC) | |
1833 | return ret; | |
1834 | ||
1835 | un = tty->driver_data; | |
1836 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1837 | return ret; | |
1838 | ||
1839 | ch = un->un_ch; | |
1840 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1841 | return ret; | |
1842 | ||
1843 | bd = ch->ch_bd; | |
1844 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1845 | return ret; | |
1846 | ||
a44b508a | 1847 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1848 | |
50667c67 | 1849 | if (set & TIOCM_RTS) |
0b99d589 | 1850 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 1851 | |
50667c67 | 1852 | if (set & TIOCM_DTR) |
0b99d589 | 1853 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 | 1854 | |
50667c67 | 1855 | if (clear & TIOCM_RTS) |
0b99d589 | 1856 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 1857 | |
50667c67 | 1858 | if (clear & TIOCM_DTR) |
0b99d589 | 1859 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
1860 | |
1861 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
1862 | ||
a44b508a | 1863 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1864 | |
8f90ef80 | 1865 | return 0; |
0b99d589 LL |
1866 | } |
1867 | ||
0b99d589 LL |
1868 | /* |
1869 | * dgnc_tty_send_break() | |
1870 | * | |
1871 | * Send a Break, called by ld. | |
1872 | */ | |
1873 | static int dgnc_tty_send_break(struct tty_struct *tty, int msec) | |
1874 | { | |
03425f55 | 1875 | struct dgnc_board *bd; |
0b99d589 LL |
1876 | struct channel_t *ch; |
1877 | struct un_t *un; | |
1878 | int ret = -EIO; | |
a44b508a | 1879 | unsigned long flags; |
0b99d589 LL |
1880 | |
1881 | if (!tty || tty->magic != TTY_MAGIC) | |
1882 | return ret; | |
1883 | ||
1884 | un = tty->driver_data; | |
1885 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1886 | return ret; | |
1887 | ||
1888 | ch = un->un_ch; | |
1889 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1890 | return ret; | |
1891 | ||
1892 | bd = ch->ch_bd; | |
1893 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1894 | return ret; | |
1895 | ||
1896 | switch (msec) { | |
1897 | case -1: | |
1898 | msec = 0xFFFF; | |
1899 | break; | |
1900 | case 0: | |
1901 | msec = 0; | |
1902 | break; | |
1903 | default: | |
1904 | break; | |
1905 | } | |
1906 | ||
a44b508a | 1907 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1908 | |
1909 | ch->ch_bd->bd_ops->send_break(ch, msec); | |
1910 | ||
a44b508a | 1911 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1912 | |
8f90ef80 | 1913 | return 0; |
0b99d589 LL |
1914 | } |
1915 | ||
0b99d589 LL |
1916 | /* |
1917 | * dgnc_tty_wait_until_sent() | |
1918 | * | |
1919 | * wait until data has been transmitted, called by ld. | |
1920 | */ | |
1921 | static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
1922 | { | |
03425f55 | 1923 | struct dgnc_board *bd; |
0b99d589 LL |
1924 | struct channel_t *ch; |
1925 | struct un_t *un; | |
0b99d589 LL |
1926 | |
1927 | if (!tty || tty->magic != TTY_MAGIC) | |
1928 | return; | |
1929 | ||
1930 | un = tty->driver_data; | |
1931 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1932 | return; | |
1933 | ||
1934 | ch = un->un_ch; | |
1935 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1936 | return; | |
1937 | ||
1938 | bd = ch->ch_bd; | |
1939 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1940 | return; | |
1941 | ||
2d9920ec | 1942 | bd->bd_ops->drain(tty, 0); |
8b07d521 | 1943 | } |
0b99d589 | 1944 | |
0b99d589 LL |
1945 | /* |
1946 | * dgnc_send_xchar() | |
1947 | * | |
1948 | * send a high priority character, called by ld. | |
1949 | */ | |
1950 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char c) | |
1951 | { | |
03425f55 | 1952 | struct dgnc_board *bd; |
0b99d589 LL |
1953 | struct channel_t *ch; |
1954 | struct un_t *un; | |
a44b508a | 1955 | unsigned long flags; |
0b99d589 LL |
1956 | |
1957 | if (!tty || tty->magic != TTY_MAGIC) | |
1958 | return; | |
1959 | ||
1960 | un = tty->driver_data; | |
1961 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1962 | return; | |
1963 | ||
1964 | ch = un->un_ch; | |
1965 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1966 | return; | |
1967 | ||
1968 | bd = ch->ch_bd; | |
1969 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1970 | return; | |
1971 | ||
f3dadd29 | 1972 | dev_dbg(tty->dev, "dgnc_tty_send_xchar start\n"); |
0b99d589 | 1973 | |
a44b508a | 1974 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1975 | bd->bd_ops->send_immediate_char(ch, c); |
a44b508a | 1976 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1977 | |
f3dadd29 | 1978 | dev_dbg(tty->dev, "dgnc_tty_send_xchar finish\n"); |
8b07d521 | 1979 | } |
0b99d589 | 1980 | |
0b99d589 LL |
1981 | /* |
1982 | * Return modem signals to ld. | |
1983 | */ | |
1984 | static inline int dgnc_get_mstat(struct channel_t *ch) | |
1985 | { | |
1986 | unsigned char mstat; | |
1987 | int result = -EIO; | |
a44b508a | 1988 | unsigned long flags; |
0b99d589 | 1989 | |
0b99d589 | 1990 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
8f90ef80 | 1991 | return -ENXIO; |
0b99d589 | 1992 | |
a44b508a | 1993 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1994 | |
0b7ceaa6 | 1995 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1996 | |
a44b508a | 1997 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1998 | |
1999 | result = 0; | |
2000 | ||
2001 | if (mstat & UART_MCR_DTR) | |
2002 | result |= TIOCM_DTR; | |
2003 | if (mstat & UART_MCR_RTS) | |
2004 | result |= TIOCM_RTS; | |
2005 | if (mstat & UART_MSR_CTS) | |
2006 | result |= TIOCM_CTS; | |
2007 | if (mstat & UART_MSR_DSR) | |
2008 | result |= TIOCM_DSR; | |
2009 | if (mstat & UART_MSR_RI) | |
2010 | result |= TIOCM_RI; | |
2011 | if (mstat & UART_MSR_DCD) | |
2012 | result |= TIOCM_CD; | |
2013 | ||
8f90ef80 | 2014 | return result; |
0b99d589 LL |
2015 | } |
2016 | ||
0b99d589 LL |
2017 | /* |
2018 | * Return modem signals to ld. | |
2019 | */ | |
851f306d CM |
2020 | static int dgnc_get_modem_info(struct channel_t *ch, |
2021 | unsigned int __user *value) | |
0b99d589 LL |
2022 | { |
2023 | int result; | |
0b99d589 | 2024 | |
0b99d589 | 2025 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
8f90ef80 | 2026 | return -ENXIO; |
0b99d589 LL |
2027 | |
2028 | result = dgnc_get_mstat(ch); | |
2029 | ||
2030 | if (result < 0) | |
8f90ef80 | 2031 | return -ENXIO; |
0b99d589 | 2032 | |
3dfe7557 | 2033 | return put_user(result, value); |
0b99d589 LL |
2034 | } |
2035 | ||
0b99d589 LL |
2036 | /* |
2037 | * dgnc_set_modem_info() | |
2038 | * | |
2039 | * Set modem signals, called by ld. | |
2040 | */ | |
851f306d CM |
2041 | static int dgnc_set_modem_info(struct tty_struct *tty, |
2042 | unsigned int command, | |
2043 | unsigned int __user *value) | |
0b99d589 | 2044 | { |
03425f55 | 2045 | struct dgnc_board *bd; |
0b99d589 LL |
2046 | struct channel_t *ch; |
2047 | struct un_t *un; | |
2048 | int ret = -ENXIO; | |
2049 | unsigned int arg = 0; | |
a44b508a | 2050 | unsigned long flags; |
0b99d589 LL |
2051 | |
2052 | if (!tty || tty->magic != TTY_MAGIC) | |
2053 | return ret; | |
2054 | ||
2055 | un = tty->driver_data; | |
2056 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2057 | return ret; | |
2058 | ||
2059 | ch = un->un_ch; | |
2060 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2061 | return ret; | |
2062 | ||
2063 | bd = ch->ch_bd; | |
2064 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2065 | return ret; | |
2066 | ||
0b99d589 LL |
2067 | ret = get_user(arg, value); |
2068 | if (ret) | |
8f90ef80 | 2069 | return ret; |
0b99d589 LL |
2070 | |
2071 | switch (command) { | |
2072 | case TIOCMBIS: | |
50667c67 | 2073 | if (arg & TIOCM_RTS) |
0b99d589 | 2074 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 2075 | |
50667c67 | 2076 | if (arg & TIOCM_DTR) |
0b99d589 | 2077 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 LL |
2078 | |
2079 | break; | |
2080 | ||
2081 | case TIOCMBIC: | |
50667c67 | 2082 | if (arg & TIOCM_RTS) |
0b99d589 | 2083 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 2084 | |
50667c67 | 2085 | if (arg & TIOCM_DTR) |
0b99d589 | 2086 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
2087 | |
2088 | break; | |
2089 | ||
90d2a471 | 2090 | case TIOCMSET: |
0b99d589 | 2091 | |
50667c67 | 2092 | if (arg & TIOCM_RTS) |
0b99d589 | 2093 | ch->ch_mostat |= UART_MCR_RTS; |
50667c67 | 2094 | else |
0b99d589 | 2095 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 2096 | |
50667c67 | 2097 | if (arg & TIOCM_DTR) |
0b99d589 | 2098 | ch->ch_mostat |= UART_MCR_DTR; |
50667c67 | 2099 | else |
0b99d589 | 2100 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
2101 | |
2102 | break; | |
2103 | ||
2104 | default: | |
8f90ef80 | 2105 | return -EINVAL; |
0b99d589 LL |
2106 | } |
2107 | ||
a44b508a | 2108 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2109 | |
2110 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
2111 | ||
a44b508a | 2112 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2113 | |
8f90ef80 | 2114 | return 0; |
0b99d589 LL |
2115 | } |
2116 | ||
0b99d589 | 2117 | /* |
8b07d521 | 2118 | * dgnc_tty_digigeta() |
0b99d589 LL |
2119 | * |
2120 | * Ioctl to get the information for ditty. | |
2121 | * | |
2122 | * | |
2123 | * | |
2124 | */ | |
851f306d CM |
2125 | static int dgnc_tty_digigeta(struct tty_struct *tty, |
2126 | struct digi_t __user *retinfo) | |
0b99d589 LL |
2127 | { |
2128 | struct channel_t *ch; | |
2129 | struct un_t *un; | |
2130 | struct digi_t tmp; | |
a44b508a | 2131 | unsigned long flags; |
0b99d589 LL |
2132 | |
2133 | if (!retinfo) | |
8f90ef80 | 2134 | return -EFAULT; |
0b99d589 LL |
2135 | |
2136 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2137 | return -EFAULT; |
0b99d589 LL |
2138 | |
2139 | un = tty->driver_data; | |
2140 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2141 | return -EFAULT; |
0b99d589 LL |
2142 | |
2143 | ch = un->un_ch; | |
2144 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2145 | return -EFAULT; |
0b99d589 LL |
2146 | |
2147 | memset(&tmp, 0, sizeof(tmp)); | |
2148 | ||
a44b508a | 2149 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2150 | memcpy(&tmp, &ch->ch_digi, sizeof(tmp)); |
a44b508a | 2151 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2152 | |
2153 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) | |
8f90ef80 | 2154 | return -EFAULT; |
0b99d589 | 2155 | |
8f90ef80 | 2156 | return 0; |
0b99d589 LL |
2157 | } |
2158 | ||
0b99d589 | 2159 | /* |
8b07d521 | 2160 | * dgnc_tty_digiseta() |
0b99d589 LL |
2161 | * |
2162 | * Ioctl to set the information for ditty. | |
2163 | * | |
2164 | * | |
2165 | * | |
2166 | */ | |
851f306d CM |
2167 | static int dgnc_tty_digiseta(struct tty_struct *tty, |
2168 | struct digi_t __user *new_info) | |
0b99d589 | 2169 | { |
03425f55 | 2170 | struct dgnc_board *bd; |
0b99d589 LL |
2171 | struct channel_t *ch; |
2172 | struct un_t *un; | |
2173 | struct digi_t new_digi; | |
a44b508a | 2174 | unsigned long flags; |
0b99d589 | 2175 | |
0b99d589 | 2176 | if (!tty || tty->magic != TTY_MAGIC) |
8f90ef80 | 2177 | return -EFAULT; |
0b99d589 LL |
2178 | |
2179 | un = tty->driver_data; | |
2180 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2181 | return -EFAULT; |
0b99d589 LL |
2182 | |
2183 | ch = un->un_ch; | |
2184 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2185 | return -EFAULT; |
0b99d589 LL |
2186 | |
2187 | bd = ch->ch_bd; | |
2188 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2189 | return -EFAULT; |
0b99d589 | 2190 | |
f1e51745 | 2191 | if (copy_from_user(&new_digi, new_info, sizeof(new_digi))) |
8f90ef80 | 2192 | return -EFAULT; |
0b99d589 | 2193 | |
a44b508a | 2194 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2195 | |
2196 | /* | |
2197 | * Handle transistions to and from RTS Toggle. | |
2198 | */ | |
851f306d CM |
2199 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2200 | (new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 | 2201 | ch->ch_mostat &= ~(UART_MCR_RTS); |
851f306d CM |
2202 | if ((ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2203 | !(new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 LL |
2204 | ch->ch_mostat |= (UART_MCR_RTS); |
2205 | ||
2206 | /* | |
2207 | * Handle transistions to and from DTR Toggle. | |
2208 | */ | |
851f306d CM |
2209 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2210 | (new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 | 2211 | ch->ch_mostat &= ~(UART_MCR_DTR); |
851f306d CM |
2212 | if ((ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2213 | !(new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 LL |
2214 | ch->ch_mostat |= (UART_MCR_DTR); |
2215 | ||
a07bf39a | 2216 | memcpy(&ch->ch_digi, &new_digi, sizeof(new_digi)); |
0b99d589 | 2217 | |
8b07d521 | 2218 | if (ch->ch_digi.digi_maxcps < 1) |
0b99d589 LL |
2219 | ch->ch_digi.digi_maxcps = 1; |
2220 | ||
8b07d521 | 2221 | if (ch->ch_digi.digi_maxcps > 10000) |
0b99d589 LL |
2222 | ch->ch_digi.digi_maxcps = 10000; |
2223 | ||
2224 | if (ch->ch_digi.digi_bufsize < 10) | |
2225 | ch->ch_digi.digi_bufsize = 10; | |
2226 | ||
2227 | if (ch->ch_digi.digi_maxchar < 1) | |
2228 | ch->ch_digi.digi_maxchar = 1; | |
2229 | ||
2230 | if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize) | |
2231 | ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize; | |
2232 | ||
2233 | if (ch->ch_digi.digi_onlen > DIGI_PLEN) | |
2234 | ch->ch_digi.digi_onlen = DIGI_PLEN; | |
2235 | ||
2236 | if (ch->ch_digi.digi_offlen > DIGI_PLEN) | |
2237 | ch->ch_digi.digi_offlen = DIGI_PLEN; | |
2238 | ||
2239 | ch->ch_bd->bd_ops->param(tty); | |
2240 | ||
a44b508a | 2241 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2242 | |
8f90ef80 | 2243 | return 0; |
0b99d589 LL |
2244 | } |
2245 | ||
0b99d589 LL |
2246 | /* |
2247 | * dgnc_set_termios() | |
2248 | */ | |
851f306d CM |
2249 | static void dgnc_tty_set_termios(struct tty_struct *tty, |
2250 | struct ktermios *old_termios) | |
0b99d589 | 2251 | { |
03425f55 | 2252 | struct dgnc_board *bd; |
0b99d589 LL |
2253 | struct channel_t *ch; |
2254 | struct un_t *un; | |
a44b508a | 2255 | unsigned long flags; |
0b99d589 LL |
2256 | |
2257 | if (!tty || tty->magic != TTY_MAGIC) | |
2258 | return; | |
2259 | ||
2260 | un = tty->driver_data; | |
2261 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2262 | return; | |
2263 | ||
2264 | ch = un->un_ch; | |
2265 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2266 | return; | |
2267 | ||
2268 | bd = ch->ch_bd; | |
2269 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2270 | return; | |
2271 | ||
a44b508a | 2272 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2273 | |
22e3de76 LL |
2274 | ch->ch_c_cflag = tty->termios.c_cflag; |
2275 | ch->ch_c_iflag = tty->termios.c_iflag; | |
2276 | ch->ch_c_oflag = tty->termios.c_oflag; | |
2277 | ch->ch_c_lflag = tty->termios.c_lflag; | |
2278 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
2279 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
2280 | |
2281 | ch->ch_bd->bd_ops->param(tty); | |
2282 | dgnc_carrier(ch); | |
2283 | ||
a44b508a | 2284 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2285 | } |
2286 | ||
0b99d589 LL |
2287 | static void dgnc_tty_throttle(struct tty_struct *tty) |
2288 | { | |
2289 | struct channel_t *ch; | |
2290 | struct un_t *un; | |
a44b508a | 2291 | unsigned long flags; |
0b99d589 LL |
2292 | |
2293 | if (!tty || tty->magic != TTY_MAGIC) | |
2294 | return; | |
2295 | ||
2296 | un = tty->driver_data; | |
2297 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2298 | return; | |
8b07d521 | 2299 | |
90d2a471 LL |
2300 | ch = un->un_ch; |
2301 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2302 | return; | |
0b99d589 | 2303 | |
a44b508a | 2304 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2305 | |
2306 | ch->ch_flags |= (CH_FORCED_STOPI); | |
2307 | ||
a44b508a | 2308 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2309 | } |
2310 | ||
0b99d589 LL |
2311 | static void dgnc_tty_unthrottle(struct tty_struct *tty) |
2312 | { | |
2313 | struct channel_t *ch; | |
2314 | struct un_t *un; | |
a44b508a | 2315 | unsigned long flags; |
0b99d589 LL |
2316 | |
2317 | if (!tty || tty->magic != TTY_MAGIC) | |
2318 | return; | |
2319 | ||
2320 | un = tty->driver_data; | |
2321 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2322 | return; | |
8b07d521 | 2323 | |
90d2a471 LL |
2324 | ch = un->un_ch; |
2325 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2326 | return; | |
0b99d589 | 2327 | |
a44b508a | 2328 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2329 | |
2330 | ch->ch_flags &= ~(CH_FORCED_STOPI); | |
2331 | ||
a44b508a | 2332 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2333 | } |
2334 | ||
0b99d589 LL |
2335 | static void dgnc_tty_start(struct tty_struct *tty) |
2336 | { | |
03425f55 | 2337 | struct dgnc_board *bd; |
0b99d589 LL |
2338 | struct channel_t *ch; |
2339 | struct un_t *un; | |
a44b508a | 2340 | unsigned long flags; |
0b99d589 LL |
2341 | |
2342 | if (!tty || tty->magic != TTY_MAGIC) | |
2343 | return; | |
2344 | ||
2345 | un = tty->driver_data; | |
2346 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2347 | return; | |
8b07d521 | 2348 | |
90d2a471 LL |
2349 | ch = un->un_ch; |
2350 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2351 | return; | |
0b99d589 LL |
2352 | |
2353 | bd = ch->ch_bd; | |
2354 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2355 | return; | |
2356 | ||
a44b508a | 2357 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2358 | |
2359 | ch->ch_flags &= ~(CH_FORCED_STOP); | |
2360 | ||
a44b508a | 2361 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2362 | } |
2363 | ||
0b99d589 LL |
2364 | static void dgnc_tty_stop(struct tty_struct *tty) |
2365 | { | |
03425f55 | 2366 | struct dgnc_board *bd; |
0b99d589 LL |
2367 | struct channel_t *ch; |
2368 | struct un_t *un; | |
a44b508a | 2369 | unsigned long flags; |
0b99d589 LL |
2370 | |
2371 | if (!tty || tty->magic != TTY_MAGIC) | |
2372 | return; | |
2373 | ||
2374 | un = tty->driver_data; | |
2375 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2376 | return; | |
8b07d521 | 2377 | |
90d2a471 LL |
2378 | ch = un->un_ch; |
2379 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2380 | return; | |
0b99d589 LL |
2381 | |
2382 | bd = ch->ch_bd; | |
2383 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2384 | return; | |
2385 | ||
a44b508a | 2386 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2387 | |
2388 | ch->ch_flags |= (CH_FORCED_STOP); | |
2389 | ||
a44b508a | 2390 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2391 | } |
2392 | ||
8b07d521 | 2393 | /* |
0b99d589 LL |
2394 | * dgnc_tty_flush_chars() |
2395 | * | |
2396 | * Flush the cook buffer | |
2397 | * | |
2398 | * Note to self, and any other poor souls who venture here: | |
2399 | * | |
2400 | * flush in this case DOES NOT mean dispose of the data. | |
2401 | * instead, it means "stop buffering and send it if you | |
2402 | * haven't already." Just guess how I figured that out... SRW 2-Jun-98 | |
2403 | * | |
2404 | * It is also always called in interrupt context - JAR 8-Sept-99 | |
2405 | */ | |
2406 | static void dgnc_tty_flush_chars(struct tty_struct *tty) | |
2407 | { | |
03425f55 | 2408 | struct dgnc_board *bd; |
0b99d589 LL |
2409 | struct channel_t *ch; |
2410 | struct un_t *un; | |
a44b508a | 2411 | unsigned long flags; |
0b99d589 LL |
2412 | |
2413 | if (!tty || tty->magic != TTY_MAGIC) | |
2414 | return; | |
2415 | ||
2416 | un = tty->driver_data; | |
2417 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2418 | return; | |
8b07d521 | 2419 | |
90d2a471 LL |
2420 | ch = un->un_ch; |
2421 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2422 | return; | |
0b99d589 LL |
2423 | |
2424 | bd = ch->ch_bd; | |
2425 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2426 | return; | |
2427 | ||
a44b508a | 2428 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2429 | |
2430 | /* Do something maybe here */ | |
2431 | ||
a44b508a | 2432 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2433 | } |
2434 | ||
0b99d589 LL |
2435 | /* |
2436 | * dgnc_tty_flush_buffer() | |
8b07d521 | 2437 | * |
0b99d589 LL |
2438 | * Flush Tx buffer (make in == out) |
2439 | */ | |
2440 | static void dgnc_tty_flush_buffer(struct tty_struct *tty) | |
2441 | { | |
2442 | struct channel_t *ch; | |
2443 | struct un_t *un; | |
a44b508a | 2444 | unsigned long flags; |
0b99d589 LL |
2445 | |
2446 | if (!tty || tty->magic != TTY_MAGIC) | |
2447 | return; | |
2448 | ||
2449 | un = tty->driver_data; | |
2450 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2451 | return; | |
8b07d521 | 2452 | |
90d2a471 LL |
2453 | ch = un->un_ch; |
2454 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2455 | return; | |
0b99d589 | 2456 | |
a44b508a | 2457 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2458 | |
2459 | ch->ch_flags &= ~CH_STOP; | |
2460 | ||
2461 | /* Flush our write queue */ | |
2462 | ch->ch_w_head = ch->ch_w_tail; | |
2463 | ||
2464 | /* Flush UARTs transmit FIFO */ | |
2465 | ch->ch_bd->bd_ops->flush_uart_write(ch); | |
2466 | ||
adcb56f9 RS |
2467 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
2468 | ch->ch_tun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2469 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2470 | } | |
adcb56f9 RS |
2471 | if (ch->ch_pun.un_flags & (UN_LOW | UN_EMPTY)) { |
2472 | ch->ch_pun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2473 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2474 | } | |
2475 | ||
a44b508a | 2476 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2477 | } |
2478 | ||
0b99d589 LL |
2479 | /***************************************************************************** |
2480 | * | |
2481 | * The IOCTL function and all of its helpers | |
2482 | * | |
2483 | *****************************************************************************/ | |
8b07d521 | 2484 | |
0b99d589 LL |
2485 | /* |
2486 | * dgnc_tty_ioctl() | |
2487 | * | |
2488 | * The usual assortment of ioctl's | |
2489 | */ | |
a31cefa2 | 2490 | static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
e352d3f1 | 2491 | unsigned long arg) |
0b99d589 | 2492 | { |
03425f55 | 2493 | struct dgnc_board *bd; |
8670a56f | 2494 | struct board_ops *ch_bd_ops; |
0b99d589 LL |
2495 | struct channel_t *ch; |
2496 | struct un_t *un; | |
2497 | int rc; | |
a44b508a | 2498 | unsigned long flags; |
6f418259 | 2499 | void __user *uarg = (void __user *)arg; |
0b99d589 LL |
2500 | |
2501 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2502 | return -ENODEV; |
0b99d589 LL |
2503 | |
2504 | un = tty->driver_data; | |
2505 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2506 | return -ENODEV; |
0b99d589 LL |
2507 | |
2508 | ch = un->un_ch; | |
2509 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2510 | return -ENODEV; |
0b99d589 LL |
2511 | |
2512 | bd = ch->ch_bd; | |
2513 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2514 | return -ENODEV; |
0b99d589 | 2515 | |
8670a56f DY |
2516 | ch_bd_ops = bd->bd_ops; |
2517 | ||
a44b508a | 2518 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2519 | |
2520 | if (un->un_open_count <= 0) { | |
a44b508a | 2521 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2522 | return -EIO; |
0b99d589 LL |
2523 | } |
2524 | ||
2525 | switch (cmd) { | |
0b99d589 LL |
2526 | /* Here are all the standard ioctl's that we MUST implement */ |
2527 | ||
2528 | case TCSBRK: | |
2529 | /* | |
8b07d521 | 2530 | * TCSBRK is SVID version: non-zero arg --> no break |
0b99d589 LL |
2531 | * this behaviour is exploited by tcdrain(). |
2532 | * | |
2533 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be | |
2534 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2535 | * in the middle: 0.375 seconds. | |
2536 | */ | |
2537 | rc = tty_check_change(tty); | |
a44b508a | 2538 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2539 | if (rc) |
8f90ef80 | 2540 | return rc; |
0b99d589 | 2541 | |
8670a56f | 2542 | rc = ch_bd_ops->drain(tty, 0); |
0b99d589 | 2543 | |
f1e51745 | 2544 | if (rc) |
8f90ef80 | 2545 | return -EINTR; |
0b99d589 | 2546 | |
a44b508a | 2547 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2548 | |
3c4019d3 | 2549 | if (((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP)) |
8670a56f | 2550 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2551 | |
a44b508a | 2552 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2553 | |
8f90ef80 | 2554 | return 0; |
0b99d589 | 2555 | |
0b99d589 | 2556 | case TCSBRKP: |
90d2a471 | 2557 | /* support for POSIX tcsendbreak() |
0b99d589 LL |
2558 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be |
2559 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2560 | * in the middle: 0.375 seconds. | |
2561 | */ | |
2562 | rc = tty_check_change(tty); | |
a44b508a | 2563 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2564 | if (rc) |
8f90ef80 | 2565 | return rc; |
0b99d589 | 2566 | |
8670a56f | 2567 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2568 | if (rc) |
8f90ef80 | 2569 | return -EINTR; |
0b99d589 | 2570 | |
a44b508a | 2571 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2572 | |
8670a56f | 2573 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2574 | |
a44b508a | 2575 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2576 | |
8f90ef80 | 2577 | return 0; |
0b99d589 LL |
2578 | |
2579 | case TIOCSBRK: | |
2580 | rc = tty_check_change(tty); | |
a44b508a | 2581 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2582 | if (rc) |
8f90ef80 | 2583 | return rc; |
0b99d589 | 2584 | |
8670a56f | 2585 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2586 | if (rc) |
8f90ef80 | 2587 | return -EINTR; |
0b99d589 | 2588 | |
a44b508a | 2589 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2590 | |
8670a56f | 2591 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2592 | |
a44b508a | 2593 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2594 | |
8f90ef80 | 2595 | return 0; |
0b99d589 LL |
2596 | |
2597 | case TIOCCBRK: | |
2598 | /* Do Nothing */ | |
a44b508a | 2599 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2600 | return 0; |
2601 | ||
2602 | case TIOCGSOFTCAR: | |
2603 | ||
a44b508a | 2604 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2605 | |
851f306d | 2606 | rc = put_user(C_CLOCAL(tty) ? 1 : 0, |
6f418259 | 2607 | (unsigned long __user *)arg); |
8f90ef80 | 2608 | return rc; |
0b99d589 LL |
2609 | |
2610 | case TIOCSSOFTCAR: | |
2611 | ||
a44b508a | 2612 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2613 | rc = get_user(arg, (unsigned long __user *)arg); |
0b99d589 | 2614 | if (rc) |
8f90ef80 | 2615 | return rc; |
0b99d589 | 2616 | |
a44b508a | 2617 | spin_lock_irqsave(&ch->ch_lock, flags); |
851f306d CM |
2618 | tty->termios.c_cflag = ((tty->termios.c_cflag & ~CLOCAL) | |
2619 | (arg ? CLOCAL : 0)); | |
8670a56f | 2620 | ch_bd_ops->param(tty); |
a44b508a | 2621 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2622 | |
8f90ef80 | 2623 | return 0; |
8b07d521 | 2624 | |
0b99d589 | 2625 | case TIOCMGET: |
a44b508a | 2626 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2627 | return dgnc_get_modem_info(ch, uarg); |
0b99d589 LL |
2628 | |
2629 | case TIOCMBIS: | |
2630 | case TIOCMBIC: | |
2631 | case TIOCMSET: | |
a44b508a | 2632 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2633 | return dgnc_set_modem_info(tty, cmd, uarg); |
0b99d589 LL |
2634 | |
2635 | /* | |
2636 | * Here are any additional ioctl's that we want to implement | |
2637 | */ | |
8b07d521 LL |
2638 | |
2639 | case TCFLSH: | |
0b99d589 LL |
2640 | /* |
2641 | * The linux tty driver doesn't have a flush | |
2642 | * input routine for the driver, assuming all backed | |
2643 | * up data is in the line disc. buffers. However, | |
2644 | * we all know that's not the case. Here, we | |
2645 | * act on the ioctl, but then lie and say we didn't | |
2646 | * so the line discipline will process the flush | |
2647 | * also. | |
8b07d521 | 2648 | */ |
0b99d589 LL |
2649 | rc = tty_check_change(tty); |
2650 | if (rc) { | |
a44b508a | 2651 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2652 | return rc; |
0b99d589 LL |
2653 | } |
2654 | ||
2655 | if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) { | |
2656 | ch->ch_r_head = ch->ch_r_tail; | |
8670a56f | 2657 | ch_bd_ops->flush_uart_read(ch); |
0b99d589 LL |
2658 | /* Force queue flow control to be released, if needed */ |
2659 | dgnc_check_queue_flow_control(ch); | |
2660 | } | |
2661 | ||
2662 | if ((arg == TCOFLUSH) || (arg == TCIOFLUSH)) { | |
2663 | if (!(un->un_type == DGNC_PRINT)) { | |
2664 | ch->ch_w_head = ch->ch_w_tail; | |
8670a56f | 2665 | ch_bd_ops->flush_uart_write(ch); |
0b99d589 | 2666 | |
24039c58 | 2667 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
851f306d | 2668 | ch->ch_tun.un_flags &= |
adcb56f9 | 2669 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2670 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2671 | } | |
2672 | ||
2673 | if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) { | |
851f306d | 2674 | ch->ch_pun.un_flags &= |
adcb56f9 | 2675 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2676 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2677 | } | |
0b99d589 LL |
2678 | } |
2679 | } | |
2680 | ||
8b07d521 | 2681 | /* pretend we didn't recognize this IOCTL */ |
a44b508a | 2682 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2683 | return -ENOIOCTLCMD; |
0b99d589 LL |
2684 | case TCSETSF: |
2685 | case TCSETSW: | |
2686 | /* | |
2687 | * The linux tty driver doesn't have a flush | |
2688 | * input routine for the driver, assuming all backed | |
2689 | * up data is in the line disc. buffers. However, | |
2690 | * we all know that's not the case. Here, we | |
2691 | * act on the ioctl, but then lie and say we didn't | |
2692 | * so the line discipline will process the flush | |
2693 | * also. | |
2694 | */ | |
2695 | if (cmd == TCSETSF) { | |
2696 | /* flush rx */ | |
2697 | ch->ch_flags &= ~CH_STOP; | |
2698 | ch->ch_r_head = ch->ch_r_tail; | |
8670a56f | 2699 | ch_bd_ops->flush_uart_read(ch); |
0b99d589 LL |
2700 | /* Force queue flow control to be released, if needed */ |
2701 | dgnc_check_queue_flow_control(ch); | |
2702 | } | |
2703 | ||
2704 | /* now wait for all the output to drain */ | |
a44b508a | 2705 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2706 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2707 | if (rc) |
8f90ef80 | 2708 | return -EINTR; |
0b99d589 LL |
2709 | |
2710 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2711 | return -ENOIOCTLCMD; |
0b99d589 LL |
2712 | |
2713 | case TCSETAW: | |
2714 | ||
a44b508a | 2715 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2716 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2717 | if (rc) |
8f90ef80 | 2718 | return -EINTR; |
0b99d589 LL |
2719 | |
2720 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2721 | return -ENOIOCTLCMD; |
0b99d589 LL |
2722 | |
2723 | case TCXONC: | |
a44b508a | 2724 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2725 | /* Make the ld do it */ |
8f90ef80 | 2726 | return -ENOIOCTLCMD; |
0b99d589 LL |
2727 | |
2728 | case DIGI_GETA: | |
2729 | /* get information for ditty */ | |
a44b508a | 2730 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2731 | return dgnc_tty_digigeta(tty, uarg); |
0b99d589 LL |
2732 | |
2733 | case DIGI_SETAW: | |
2734 | case DIGI_SETAF: | |
2735 | ||
2736 | /* set information for ditty */ | |
2737 | if (cmd == (DIGI_SETAW)) { | |
a44b508a | 2738 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2739 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 SL |
2740 | |
2741 | if (rc) | |
8f90ef80 | 2742 | return -EINTR; |
f1e51745 | 2743 | |
a44b508a | 2744 | spin_lock_irqsave(&ch->ch_lock, flags); |
2000c581 | 2745 | } else { |
0b99d589 LL |
2746 | tty_ldisc_flush(tty); |
2747 | } | |
2748 | /* fall thru */ | |
2749 | ||
2750 | case DIGI_SETA: | |
a44b508a | 2751 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2752 | return dgnc_tty_digiseta(tty, uarg); |
8b07d521 | 2753 | |
0b99d589 LL |
2754 | case DIGI_LOOPBACK: |
2755 | { | |
2756 | uint loopback = 0; | |
851f306d CM |
2757 | /* Let go of locks when accessing user space, |
2758 | * could sleep | |
2759 | */ | |
a44b508a | 2760 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2761 | rc = get_user(loopback, (unsigned int __user *)arg); |
0b99d589 | 2762 | if (rc) |
8f90ef80 | 2763 | return rc; |
a44b508a | 2764 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2765 | |
8b07d521 | 2766 | /* Enable/disable internal loopback for this port */ |
0b99d589 LL |
2767 | if (loopback) |
2768 | ch->ch_flags |= CH_LOOPBACK; | |
2769 | else | |
2770 | ch->ch_flags &= ~(CH_LOOPBACK); | |
2771 | ||
8670a56f | 2772 | ch_bd_ops->param(tty); |
a44b508a | 2773 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2774 | return 0; |
90d2a471 | 2775 | } |
0b99d589 LL |
2776 | |
2777 | case DIGI_GETCUSTOMBAUD: | |
a44b508a | 2778 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2779 | rc = put_user(ch->ch_custom_speed, (unsigned int __user *)arg); |
8f90ef80 | 2780 | return rc; |
0b99d589 LL |
2781 | |
2782 | case DIGI_SETCUSTOMBAUD: | |
2783 | { | |
93c76c9c | 2784 | int new_rate; |
0b99d589 | 2785 | /* Let go of locks when accessing user space, could sleep */ |
a44b508a | 2786 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2787 | rc = get_user(new_rate, (int __user *)arg); |
0b99d589 | 2788 | if (rc) |
8f90ef80 | 2789 | return rc; |
a44b508a | 2790 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2791 | dgnc_set_custom_speed(ch, new_rate); |
8670a56f | 2792 | ch_bd_ops->param(tty); |
a44b508a | 2793 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2794 | return 0; |
90d2a471 | 2795 | } |
0b99d589 LL |
2796 | |
2797 | /* | |
2798 | * This ioctl allows insertion of a character into the front | |
2799 | * of any pending data to be transmitted. | |
2800 | * | |
2801 | * This ioctl is to satify the "Send Character Immediate" | |
2802 | * call that the RealPort protocol spec requires. | |
2803 | */ | |
2804 | case DIGI_REALPORT_SENDIMMEDIATE: | |
2805 | { | |
2806 | unsigned char c; | |
0eaa02e6 | 2807 | |
a44b508a | 2808 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2809 | rc = get_user(c, (unsigned char __user *)arg); |
0b99d589 | 2810 | if (rc) |
8f90ef80 | 2811 | return rc; |
a44b508a | 2812 | spin_lock_irqsave(&ch->ch_lock, flags); |
8670a56f | 2813 | ch_bd_ops->send_immediate_char(ch, c); |
a44b508a | 2814 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2815 | return 0; |
0b99d589 LL |
2816 | } |
2817 | ||
2818 | /* | |
2819 | * This ioctl returns all the current counts for the port. | |
2820 | * | |
2821 | * This ioctl is to satify the "Line Error Counters" | |
2822 | * call that the RealPort protocol spec requires. | |
2823 | */ | |
2824 | case DIGI_REALPORT_GETCOUNTERS: | |
2825 | { | |
2826 | struct digi_getcounter buf; | |
2827 | ||
2828 | buf.norun = ch->ch_err_overrun; | |
feba47a7 | 2829 | buf.noflow = 0; /* The driver doesn't keep this stat */ |
0b99d589 LL |
2830 | buf.nframe = ch->ch_err_frame; |
2831 | buf.nparity = ch->ch_err_parity; | |
2832 | buf.nbreak = ch->ch_err_break; | |
2833 | buf.rbytes = ch->ch_rxcount; | |
2834 | buf.tbytes = ch->ch_txcount; | |
2835 | ||
a44b508a | 2836 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2837 | |
50667c67 | 2838 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2839 | return -EFAULT; |
50667c67 | 2840 | |
8f90ef80 | 2841 | return 0; |
0b99d589 LL |
2842 | } |
2843 | ||
2844 | /* | |
2845 | * This ioctl returns all current events. | |
2846 | * | |
2847 | * This ioctl is to satify the "Event Reporting" | |
2848 | * call that the RealPort protocol spec requires. | |
90d2a471 | 2849 | */ |
0b99d589 LL |
2850 | case DIGI_REALPORT_GETEVENTS: |
2851 | { | |
2852 | unsigned int events = 0; | |
2853 | ||
2854 | /* NOTE: MORE EVENTS NEEDS TO BE ADDED HERE */ | |
2855 | if (ch->ch_flags & CH_BREAK_SENDING) | |
2856 | events |= EV_TXB; | |
851f306d CM |
2857 | if ((ch->ch_flags & CH_STOP) || |
2858 | (ch->ch_flags & CH_FORCED_STOP)) | |
0b99d589 | 2859 | events |= (EV_OPU | EV_OPS); |
50667c67 | 2860 | |
851f306d CM |
2861 | if ((ch->ch_flags & CH_STOPI) || |
2862 | (ch->ch_flags & CH_FORCED_STOPI)) | |
0b99d589 | 2863 | events |= (EV_IPU | EV_IPS); |
0b99d589 | 2864 | |
a44b508a | 2865 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2866 | rc = put_user(events, (unsigned int __user *)arg); |
8f90ef80 | 2867 | return rc; |
0b99d589 LL |
2868 | } |
2869 | ||
2870 | /* | |
2871 | * This ioctl returns TOUT and TIN counters based | |
2872 | * upon the values passed in by the RealPort Server. | |
2873 | * It also passes back whether the UART Transmitter is | |
2874 | * empty as well. | |
90d2a471 | 2875 | */ |
0b99d589 LL |
2876 | case DIGI_REALPORT_GETBUFFERS: |
2877 | { | |
2878 | struct digi_getbuffer buf; | |
2879 | int tdist; | |
2880 | int count; | |
2881 | ||
a44b508a | 2882 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2883 | |
2884 | /* | |
2885 | * Get data from user first. | |
2886 | */ | |
50667c67 | 2887 | if (copy_from_user(&buf, uarg, sizeof(buf))) |
8f90ef80 | 2888 | return -EFAULT; |
0b99d589 | 2889 | |
a44b508a | 2890 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2891 | |
2892 | /* | |
2893 | * Figure out how much data is in our RX and TX queues. | |
2894 | */ | |
2895 | buf.rxbuf = (ch->ch_r_head - ch->ch_r_tail) & RQUEUEMASK; | |
2896 | buf.txbuf = (ch->ch_w_head - ch->ch_w_tail) & WQUEUEMASK; | |
2897 | ||
2898 | /* | |
2899 | * Is the UART empty? Add that value to whats in our TX queue. | |
2900 | */ | |
8670a56f | 2901 | count = buf.txbuf + ch_bd_ops->get_uart_bytes_left(ch); |
0b99d589 LL |
2902 | |
2903 | /* | |
2904 | * Figure out how much data the RealPort Server believes should | |
2905 | * be in our TX queue. | |
2906 | */ | |
b9f84637 | 2907 | tdist = (buf.tx_in - buf.tx_out) & 0xffff; |
0b99d589 LL |
2908 | |
2909 | /* | |
2910 | * If we have more data than the RealPort Server believes we | |
2911 | * should have, reduce our count to its amount. | |
2912 | * | |
2913 | * This count difference CAN happen because the Linux LD can | |
2914 | * insert more characters into our queue for OPOST processing | |
2915 | * that the RealPort Server doesn't know about. | |
2916 | */ | |
50667c67 | 2917 | if (buf.txbuf > tdist) |
0b99d589 | 2918 | buf.txbuf = tdist; |
0b99d589 LL |
2919 | |
2920 | /* | |
2921 | * Report whether our queue and UART TX are completely empty. | |
2922 | */ | |
50667c67 | 2923 | if (count) |
0b99d589 | 2924 | buf.txdone = 0; |
50667c67 | 2925 | else |
0b99d589 | 2926 | buf.txdone = 1; |
0b99d589 | 2927 | |
a44b508a | 2928 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2929 | |
50667c67 | 2930 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2931 | return -EFAULT; |
50667c67 | 2932 | |
8f90ef80 | 2933 | return 0; |
0b99d589 LL |
2934 | } |
2935 | default: | |
a44b508a | 2936 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2937 | |
8f90ef80 | 2938 | return -ENOIOCTLCMD; |
0b99d589 | 2939 | } |
0b99d589 | 2940 | } |