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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 LL |
178 | { |
179 | int rc = 0; | |
180 | ||
992aa7b5 | 181 | brd->serial_driver.magic = TTY_DRIVER_MAGIC; |
8b07d521 | 182 | |
a25ad520 | 183 | snprintf(brd->serial_name, MAXTTYNAMELEN, "tty_dgnc_%d_", brd->boardnum); |
0b99d589 | 184 | |
a25ad520 | 185 | brd->serial_driver.name = brd->serial_name; |
992aa7b5 DY |
186 | brd->serial_driver.name_base = 0; |
187 | brd->serial_driver.major = 0; | |
188 | brd->serial_driver.minor_start = 0; | |
189 | brd->serial_driver.num = brd->maxports; | |
190 | brd->serial_driver.type = TTY_DRIVER_TYPE_SERIAL; | |
191 | brd->serial_driver.subtype = SERIAL_TYPE_NORMAL; | |
192 | brd->serial_driver.init_termios = DgncDefaultTermios; | |
193 | brd->serial_driver.driver_name = DRVSTR; | |
194 | brd->serial_driver.flags = (TTY_DRIVER_REAL_RAW | | |
851f306d CM |
195 | TTY_DRIVER_DYNAMIC_DEV | |
196 | TTY_DRIVER_HARDWARE_BREAK); | |
0b99d589 | 197 | |
8b07d521 | 198 | /* |
0b99d589 | 199 | * The kernel wants space to store pointers to |
8b07d521 | 200 | * tty_struct's and termios's. |
0b99d589 | 201 | */ |
992aa7b5 DY |
202 | brd->serial_driver.ttys = kcalloc(brd->maxports, |
203 | sizeof(*brd->serial_driver.ttys), | |
851f306d | 204 | GFP_KERNEL); |
992aa7b5 | 205 | if (!brd->serial_driver.ttys) |
8f90ef80 | 206 | return -ENOMEM; |
0b99d589 | 207 | |
992aa7b5 DY |
208 | kref_init(&brd->serial_driver.kref); |
209 | brd->serial_driver.termios = kcalloc(brd->maxports, | |
210 | sizeof(*brd->serial_driver.termios), | |
851f306d | 211 | GFP_KERNEL); |
992aa7b5 | 212 | if (!brd->serial_driver.termios) |
8f90ef80 | 213 | return -ENOMEM; |
0b99d589 | 214 | |
0b99d589 LL |
215 | /* |
216 | * Entry points for driver. Called by the kernel from | |
217 | * tty_io.c and n_tty.c. | |
218 | */ | |
992aa7b5 | 219 | tty_set_operations(&brd->serial_driver, &dgnc_tty_ops); |
0b99d589 | 220 | |
a25ad520 | 221 | if (!brd->dgnc_major_serial_registered) { |
0b99d589 | 222 | /* Register tty devices */ |
992aa7b5 | 223 | rc = tty_register_driver(&brd->serial_driver); |
0b99d589 | 224 | if (rc < 0) { |
1f26adc9 RD |
225 | dev_dbg(&brd->pdev->dev, |
226 | "Can't register tty device (%d)\n", rc); | |
8f90ef80 | 227 | return rc; |
0b99d589 | 228 | } |
a25ad520 | 229 | brd->dgnc_major_serial_registered = true; |
0b99d589 LL |
230 | } |
231 | ||
232 | /* | |
233 | * If we're doing transparent print, we have to do all of the above | |
79e30af2 | 234 | * again, separately so we don't get the LD confused about what major |
0b99d589 LL |
235 | * we are when we get into the dgnc_tty_open() routine. |
236 | */ | |
992aa7b5 | 237 | brd->print_driver.magic = TTY_DRIVER_MAGIC; |
a25ad520 | 238 | snprintf(brd->print_name, MAXTTYNAMELEN, "pr_dgnc_%d_", brd->boardnum); |
0b99d589 | 239 | |
a25ad520 | 240 | brd->print_driver.name = brd->print_name; |
992aa7b5 DY |
241 | brd->print_driver.name_base = 0; |
242 | brd->print_driver.major = brd->serial_driver.major; | |
243 | brd->print_driver.minor_start = 0x80; | |
244 | brd->print_driver.num = brd->maxports; | |
245 | brd->print_driver.type = TTY_DRIVER_TYPE_SERIAL; | |
246 | brd->print_driver.subtype = SERIAL_TYPE_NORMAL; | |
247 | brd->print_driver.init_termios = DgncDefaultTermios; | |
248 | brd->print_driver.driver_name = DRVSTR; | |
249 | brd->print_driver.flags = (TTY_DRIVER_REAL_RAW | | |
851f306d CM |
250 | TTY_DRIVER_DYNAMIC_DEV | |
251 | TTY_DRIVER_HARDWARE_BREAK); | |
0b99d589 LL |
252 | |
253 | /* | |
254 | * The kernel wants space to store pointers to | |
79e30af2 | 255 | * tty_struct's and termios's. Must be separated from |
0b99d589 LL |
256 | * the Serial Driver so we don't get confused |
257 | */ | |
992aa7b5 DY |
258 | brd->print_driver.ttys = kcalloc(brd->maxports, |
259 | sizeof(*brd->print_driver.ttys), | |
851f306d | 260 | GFP_KERNEL); |
992aa7b5 | 261 | if (!brd->print_driver.ttys) |
8f90ef80 | 262 | return -ENOMEM; |
992aa7b5 DY |
263 | kref_init(&brd->print_driver.kref); |
264 | brd->print_driver.termios = kcalloc(brd->maxports, | |
265 | sizeof(*brd->print_driver.termios), | |
851f306d | 266 | GFP_KERNEL); |
992aa7b5 | 267 | if (!brd->print_driver.termios) |
8f90ef80 | 268 | return -ENOMEM; |
0b99d589 | 269 | |
0b99d589 LL |
270 | /* |
271 | * Entry points for driver. Called by the kernel from | |
272 | * tty_io.c and n_tty.c. | |
273 | */ | |
992aa7b5 | 274 | tty_set_operations(&brd->print_driver, &dgnc_tty_ops); |
0b99d589 | 275 | |
a25ad520 | 276 | if (!brd->dgnc_major_transparent_print_registered) { |
0b99d589 | 277 | /* Register Transparent Print devices */ |
992aa7b5 | 278 | rc = tty_register_driver(&brd->print_driver); |
0b99d589 | 279 | if (rc < 0) { |
1f26adc9 RD |
280 | dev_dbg(&brd->pdev->dev, |
281 | "Can't register Transparent Print device(%d)\n", | |
282 | rc); | |
8f90ef80 | 283 | return rc; |
0b99d589 | 284 | } |
a25ad520 | 285 | brd->dgnc_major_transparent_print_registered = true; |
0b99d589 LL |
286 | } |
287 | ||
992aa7b5 | 288 | dgnc_BoardsByMajor[brd->serial_driver.major] = brd; |
0b99d589 | 289 | |
8f90ef80 | 290 | return rc; |
0b99d589 LL |
291 | } |
292 | ||
0b99d589 LL |
293 | /* |
294 | * dgnc_tty_init() | |
295 | * | |
296 | * Init the tty subsystem. Called once per board after board has been | |
297 | * downloaded and init'ed. | |
298 | */ | |
03425f55 | 299 | int dgnc_tty_init(struct dgnc_board *brd) |
0b99d589 LL |
300 | { |
301 | int i; | |
a7a75386 | 302 | void __iomem *vaddr; |
0b99d589 LL |
303 | struct channel_t *ch; |
304 | ||
305 | if (!brd) | |
8f90ef80 | 306 | return -ENXIO; |
0b99d589 | 307 | |
0b99d589 LL |
308 | /* |
309 | * Initialize board structure elements. | |
310 | */ | |
311 | ||
312 | vaddr = brd->re_map_membase; | |
313 | ||
314 | brd->nasync = brd->maxports; | |
315 | ||
0b99d589 | 316 | for (i = 0; i < brd->nasync; i++) { |
fa52d96c GS |
317 | /* |
318 | * Okay to malloc with GFP_KERNEL, we are not at | |
319 | * interrupt context, and there are no locks held. | |
320 | */ | |
321 | brd->channels[i] = kzalloc(sizeof(*brd->channels[i]), | |
322 | GFP_KERNEL); | |
323 | if (!brd->channels[i]) | |
324 | goto err_free_channels; | |
0b99d589 LL |
325 | } |
326 | ||
327 | ch = brd->channels[0]; | |
328 | vaddr = brd->re_map_membase; | |
329 | ||
330 | /* Set up channel variables */ | |
331 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
a44b508a | 332 | spin_lock_init(&ch->ch_lock); |
0b99d589 LL |
333 | |
334 | /* Store all our magic numbers */ | |
335 | ch->magic = DGNC_CHANNEL_MAGIC; | |
336 | ch->ch_tun.magic = DGNC_UNIT_MAGIC; | |
337 | ch->ch_tun.un_ch = ch; | |
338 | ch->ch_tun.un_type = DGNC_SERIAL; | |
339 | ch->ch_tun.un_dev = i; | |
340 | ||
341 | ch->ch_pun.magic = DGNC_UNIT_MAGIC; | |
342 | ch->ch_pun.un_ch = ch; | |
343 | ch->ch_pun.un_type = DGNC_PRINT; | |
344 | ch->ch_pun.un_dev = i + 128; | |
345 | ||
346 | if (brd->bd_uart_offset == 0x200) | |
a7a75386 | 347 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 | 348 | else |
a7a75386 | 349 | ch->ch_cls_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 LL |
350 | |
351 | ch->ch_bd = brd; | |
352 | ch->ch_portnum = i; | |
353 | ch->ch_digi = dgnc_digi_init; | |
354 | ||
355 | /* .25 second delay */ | |
356 | ch->ch_close_delay = 250; | |
357 | ||
358 | init_waitqueue_head(&ch->ch_flags_wait); | |
359 | init_waitqueue_head(&ch->ch_tun.un_flags_wait); | |
360 | init_waitqueue_head(&ch->ch_pun.un_flags_wait); | |
0b99d589 LL |
361 | |
362 | { | |
363 | struct device *classp; | |
0eaa02e6 | 364 | |
992aa7b5 | 365 | classp = tty_register_device(&brd->serial_driver, i, |
7df227c4 | 366 | &ch->ch_bd->pdev->dev); |
0b99d589 LL |
367 | ch->ch_tun.un_sysfs = classp; |
368 | dgnc_create_tty_sysfs(&ch->ch_tun, classp); | |
369 | ||
992aa7b5 | 370 | classp = tty_register_device(&brd->print_driver, i, |
7df227c4 | 371 | &ch->ch_bd->pdev->dev); |
0b99d589 LL |
372 | ch->ch_pun.un_sysfs = classp; |
373 | dgnc_create_tty_sysfs(&ch->ch_pun, classp); | |
374 | } | |
0b99d589 LL |
375 | } |
376 | ||
8f90ef80 | 377 | return 0; |
fa52d96c GS |
378 | |
379 | err_free_channels: | |
380 | for (i = i - 1; i >= 0; --i) { | |
381 | kfree(brd->channels[i]); | |
382 | brd->channels[i] = NULL; | |
383 | } | |
384 | return -ENOMEM; | |
0b99d589 LL |
385 | } |
386 | ||
0b99d589 LL |
387 | /* |
388 | * dgnc_tty_post_uninit() | |
389 | * | |
390 | * UnInitialize any global tty related data. | |
391 | */ | |
392 | void dgnc_tty_post_uninit(void) | |
393 | { | |
5b4af85e DY |
394 | kfree(dgnc_TmpWriteBuf); |
395 | dgnc_TmpWriteBuf = NULL; | |
0b99d589 LL |
396 | } |
397 | ||
0b99d589 LL |
398 | /* |
399 | * dgnc_tty_uninit() | |
400 | * | |
401 | * Uninitialize the TTY portion of this driver. Free all memory and | |
8b07d521 | 402 | * resources. |
0b99d589 | 403 | */ |
03425f55 | 404 | void dgnc_tty_uninit(struct dgnc_board *brd) |
0b99d589 LL |
405 | { |
406 | int i = 0; | |
407 | ||
a25ad520 | 408 | if (brd->dgnc_major_serial_registered) { |
992aa7b5 | 409 | dgnc_BoardsByMajor[brd->serial_driver.major] = NULL; |
0b99d589 | 410 | for (i = 0; i < brd->nasync; i++) { |
ce2927e9 GS |
411 | if (brd->channels[i]) |
412 | dgnc_remove_tty_sysfs(brd->channels[i]-> | |
413 | ch_tun.un_sysfs); | |
992aa7b5 | 414 | tty_unregister_device(&brd->serial_driver, i); |
0b99d589 | 415 | } |
992aa7b5 | 416 | tty_unregister_driver(&brd->serial_driver); |
a25ad520 | 417 | brd->dgnc_major_serial_registered = false; |
0b99d589 LL |
418 | } |
419 | ||
a25ad520 | 420 | if (brd->dgnc_major_transparent_print_registered) { |
992aa7b5 | 421 | dgnc_BoardsByMajor[brd->print_driver.major] = NULL; |
0b99d589 | 422 | for (i = 0; i < brd->nasync; i++) { |
ce2927e9 GS |
423 | if (brd->channels[i]) |
424 | dgnc_remove_tty_sysfs(brd->channels[i]-> | |
425 | ch_pun.un_sysfs); | |
992aa7b5 | 426 | tty_unregister_device(&brd->print_driver, i); |
0b99d589 | 427 | } |
992aa7b5 | 428 | tty_unregister_driver(&brd->print_driver); |
a25ad520 | 429 | brd->dgnc_major_transparent_print_registered = false; |
0b99d589 LL |
430 | } |
431 | ||
992aa7b5 DY |
432 | kfree(brd->serial_driver.ttys); |
433 | brd->serial_driver.ttys = NULL; | |
434 | kfree(brd->serial_driver.termios); | |
435 | brd->serial_driver.termios = NULL; | |
436 | kfree(brd->print_driver.ttys); | |
437 | brd->print_driver.ttys = NULL; | |
438 | kfree(brd->print_driver.termios); | |
439 | brd->print_driver.termios = NULL; | |
0b99d589 LL |
440 | } |
441 | ||
8e8d27f7 | 442 | /* |
0b99d589 LL |
443 | * dgnc_wmove - Write data to transmit queue. |
444 | * | |
445 | * ch - Pointer to channel structure. | |
f7f2b10a | 446 | * buf - Pointer to characters to be moved. |
0b99d589 | 447 | * n - Number of characters to move. |
8e8d27f7 | 448 | */ |
0b99d589 LL |
449 | static void dgnc_wmove(struct channel_t *ch, char *buf, uint n) |
450 | { | |
451 | int remain; | |
452 | uint head; | |
453 | ||
454 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
455 | return; | |
8b07d521 | 456 | |
0b99d589 LL |
457 | head = ch->ch_w_head & WQUEUEMASK; |
458 | ||
459 | /* | |
460 | * If the write wraps over the top of the circular buffer, | |
461 | * move the portion up to the wrap point, and reset the | |
462 | * pointers to the bottom. | |
463 | */ | |
464 | remain = WQUEUESIZE - head; | |
465 | ||
466 | if (n >= remain) { | |
8b07d521 | 467 | n -= remain; |
0b99d589 LL |
468 | memcpy(ch->ch_wqueue + head, buf, remain); |
469 | head = 0; | |
470 | buf += remain; | |
471 | } | |
472 | ||
473 | if (n > 0) { | |
474 | /* | |
475 | * Move rest of data. | |
476 | */ | |
477 | remain = n; | |
478 | memcpy(ch->ch_wqueue + head, buf, remain); | |
479 | head += remain; | |
480 | } | |
481 | ||
482 | head &= WQUEUEMASK; | |
483 | ch->ch_w_head = head; | |
484 | } | |
485 | ||
8e8d27f7 | 486 | /* |
0b99d589 | 487 | * dgnc_input - Process received data. |
8b07d521 | 488 | * |
90d2a471 | 489 | * ch - Pointer to channel structure. |
8e8d27f7 | 490 | */ |
0b99d589 LL |
491 | void dgnc_input(struct channel_t *ch) |
492 | { | |
03425f55 | 493 | struct dgnc_board *bd; |
0b99d589 | 494 | struct tty_struct *tp; |
c84a083b | 495 | struct tty_ldisc *ld = NULL; |
0b99d589 LL |
496 | uint rmask; |
497 | ushort head; | |
498 | ushort tail; | |
499 | int data_len; | |
a44b508a | 500 | unsigned long flags; |
0b99d589 LL |
501 | int flip_len; |
502 | int len = 0; | |
503 | int n = 0; | |
0b99d589 LL |
504 | int s = 0; |
505 | int i = 0; | |
506 | ||
507 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
508 | return; | |
509 | ||
510 | tp = ch->ch_tun.un_tty; | |
511 | ||
512 | bd = ch->ch_bd; | |
a82477c3 | 513 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
0b99d589 LL |
514 | return; |
515 | ||
a44b508a | 516 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 517 | |
8b07d521 LL |
518 | /* |
519 | * Figure the number of characters in the buffer. | |
0b99d589 LL |
520 | * Exit immediately if none. |
521 | */ | |
522 | rmask = RQUEUEMASK; | |
523 | head = ch->ch_r_head & rmask; | |
524 | tail = ch->ch_r_tail & rmask; | |
525 | data_len = (head - tail) & rmask; | |
526 | ||
c84a083b QL |
527 | if (data_len == 0) |
528 | goto exit_unlock; | |
0b99d589 | 529 | |
0b99d589 LL |
530 | /* |
531 | * If the device is not open, or CREAD is off, | |
90d2a471 | 532 | * flush input data and return immediately. |
0b99d589 | 533 | */ |
851f306d CM |
534 | if (!tp || (tp->magic != TTY_MAGIC) || |
535 | !(ch->ch_tun.un_flags & UN_ISOPEN) || | |
9db276f8 | 536 | !C_CREAD(tp) || |
851f306d | 537 | (ch->ch_tun.un_flags & UN_CLOSING)) { |
0b99d589 LL |
538 | ch->ch_r_head = tail; |
539 | ||
540 | /* Force queue flow control to be released, if needed */ | |
541 | dgnc_check_queue_flow_control(ch); | |
542 | ||
c84a083b | 543 | goto exit_unlock; |
0b99d589 LL |
544 | } |
545 | ||
546 | /* | |
547 | * If we are throttled, simply don't read any data. | |
548 | */ | |
c84a083b QL |
549 | if (ch->ch_flags & CH_FORCED_STOPI) |
550 | goto exit_unlock; | |
0b99d589 | 551 | |
100013fa | 552 | flip_len = TTY_FLIPBUF_SIZE; |
0b99d589 LL |
553 | |
554 | /* Chop down the length, if needed */ | |
555 | len = min(data_len, flip_len); | |
100013fa | 556 | len = min(len, (N_TTY_BUF_SIZE - 1)); |
0b99d589 LL |
557 | |
558 | ld = tty_ldisc_ref(tp); | |
559 | ||
0b99d589 LL |
560 | /* |
561 | * If we were unable to get a reference to the ld, | |
562 | * don't flush our buffer, and act like the ld doesn't | |
563 | * have any space to put the data right now. | |
564 | */ | |
565 | if (!ld) { | |
566 | len = 0; | |
567 | } else { | |
568 | /* | |
569 | * If ld doesn't have a pointer to a receive_buf function, | |
570 | * flush the data, then act like the ld doesn't have any | |
571 | * space to put the data right now. | |
572 | */ | |
573 | if (!ld->ops->receive_buf) { | |
574 | ch->ch_r_head = ch->ch_r_tail; | |
575 | len = 0; | |
8b07d521 | 576 | } |
0b99d589 LL |
577 | } |
578 | ||
c84a083b QL |
579 | if (len <= 0) |
580 | goto exit_unlock; | |
0b99d589 LL |
581 | |
582 | /* | |
583 | * The tty layer in the kernel has changed in 2.6.16+. | |
584 | * | |
585 | * The flip buffers in the tty structure are no longer exposed, | |
586 | * and probably will be going away eventually. | |
8b07d521 | 587 | * |
0b99d589 LL |
588 | * If we are completely raw, we don't need to go through a lot |
589 | * of the tty layers that exist. | |
590 | * In this case, we take the shortest and fastest route we | |
591 | * can to relay the data to the user. | |
592 | * | |
593 | * On the other hand, if we are not raw, we need to go through | |
594 | * the new 2.6.16+ tty layer, which has its API more well defined. | |
595 | */ | |
100013fa LL |
596 | len = tty_buffer_request_room(tp->port, len); |
597 | n = len; | |
0b99d589 | 598 | |
100013fa LL |
599 | /* |
600 | * n now contains the most amount of data we can copy, | |
601 | * bounded either by how much the Linux tty layer can handle, | |
602 | * or the amount of data the card actually has pending... | |
603 | */ | |
604 | while (n) { | |
56d118c2 DY |
605 | unsigned char *ch_pos = ch->ch_equeue + tail; |
606 | ||
100013fa LL |
607 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; |
608 | s = min(s, n); | |
0b99d589 | 609 | |
100013fa LL |
610 | if (s <= 0) |
611 | break; | |
0b99d589 LL |
612 | |
613 | /* | |
8b07d521 | 614 | * If conditions are such that ld needs to see all |
100013fa LL |
615 | * UART errors, we will have to walk each character |
616 | * and error byte and send them to the buffer one at | |
617 | * a time. | |
0b99d589 | 618 | */ |
100013fa LL |
619 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
620 | for (i = 0; i < s; i++) { | |
56d118c2 DY |
621 | unsigned char ch = *(ch_pos + i); |
622 | char flag = TTY_NORMAL; | |
623 | ||
624 | if (ch & UART_LSR_BI) | |
625 | flag = TTY_BREAK; | |
626 | else if (ch & UART_LSR_PE) | |
627 | flag = TTY_PARITY; | |
628 | else if (ch & UART_LSR_FE) | |
629 | flag = TTY_FRAME; | |
630 | ||
631 | tty_insert_flip_char(tp->port, ch, flag); | |
100013fa | 632 | } |
2000c581 | 633 | } else { |
56d118c2 | 634 | tty_insert_flip_string(tp->port, ch_pos, s); |
0b99d589 LL |
635 | } |
636 | ||
100013fa LL |
637 | tail += s; |
638 | n -= s; | |
639 | /* Flip queue if needed */ | |
640 | tail &= rmask; | |
0b99d589 | 641 | } |
0b99d589 | 642 | |
100013fa LL |
643 | ch->ch_r_tail = tail & rmask; |
644 | ch->ch_e_tail = tail & rmask; | |
645 | dgnc_check_queue_flow_control(ch); | |
a44b508a | 646 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 647 | |
100013fa LL |
648 | /* Tell the tty layer its okay to "eat" the data now */ |
649 | tty_flip_buffer_push(tp->port); | |
0b99d589 LL |
650 | |
651 | if (ld) | |
652 | tty_ldisc_deref(ld); | |
c84a083b QL |
653 | return; |
654 | ||
655 | exit_unlock: | |
5ec29365 | 656 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
c84a083b QL |
657 | if (ld) |
658 | tty_ldisc_deref(ld); | |
0b99d589 LL |
659 | } |
660 | ||
8b07d521 | 661 | /************************************************************************ |
0b99d589 | 662 | * Determines when CARRIER changes state and takes appropriate |
8b07d521 | 663 | * action. |
0b99d589 LL |
664 | ************************************************************************/ |
665 | void dgnc_carrier(struct channel_t *ch) | |
666 | { | |
03425f55 | 667 | struct dgnc_board *bd; |
0b99d589 | 668 | |
90d2a471 LL |
669 | int virt_carrier = 0; |
670 | int phys_carrier = 0; | |
8b07d521 | 671 | |
0b99d589 LL |
672 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
673 | return; | |
674 | ||
675 | bd = ch->ch_bd; | |
676 | ||
677 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
678 | return; | |
679 | ||
f1e51745 | 680 | if (ch->ch_mistat & UART_MSR_DCD) |
0b99d589 | 681 | phys_carrier = 1; |
0b99d589 | 682 | |
50667c67 | 683 | if (ch->ch_digi.digi_flags & DIGI_FORCEDCD) |
0b99d589 | 684 | virt_carrier = 1; |
0b99d589 | 685 | |
50667c67 | 686 | if (ch->ch_c_cflag & CLOCAL) |
0b99d589 | 687 | virt_carrier = 1; |
0b99d589 | 688 | |
0b99d589 LL |
689 | /* |
690 | * Test for a VIRTUAL carrier transition to HIGH. | |
691 | */ | |
692 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
0b99d589 LL |
693 | /* |
694 | * When carrier rises, wake any threads waiting | |
695 | * for carrier in the open routine. | |
696 | */ | |
697 | ||
7df227c4 | 698 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
699 | wake_up_interruptible(&ch->ch_flags_wait); |
700 | } | |
701 | ||
702 | /* | |
703 | * Test for a PHYSICAL carrier transition to HIGH. | |
704 | */ | |
705 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
0b99d589 LL |
706 | /* |
707 | * When carrier rises, wake any threads waiting | |
708 | * for carrier in the open routine. | |
709 | */ | |
710 | ||
7df227c4 | 711 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
712 | wake_up_interruptible(&ch->ch_flags_wait); |
713 | } | |
714 | ||
715 | /* | |
716 | * Test for a PHYSICAL transition to low, so long as we aren't | |
717 | * currently ignoring physical transitions (which is what "virtual | |
718 | * carrier" indicates). | |
719 | * | |
720 | * The transition of the virtual carrier to low really doesn't | |
721 | * matter... it really only means "ignore carrier state", not | |
722 | * "make pretend that carrier is there". | |
723 | */ | |
724 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) && | |
10352c2a | 725 | (phys_carrier == 0)) { |
0b99d589 LL |
726 | /* |
727 | * When carrier drops: | |
728 | * | |
729 | * Drop carrier on all open units. | |
730 | * | |
731 | * Flush queues, waking up any task waiting in the | |
732 | * line discipline. | |
733 | * | |
734 | * Send a hangup to the control terminal. | |
735 | * | |
736 | * Enable all select calls. | |
737 | */ | |
7df227c4 | 738 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
739 | wake_up_interruptible(&ch->ch_flags_wait); |
740 | ||
f1e51745 | 741 | if (ch->ch_tun.un_open_count > 0) |
0b99d589 | 742 | tty_hangup(ch->ch_tun.un_tty); |
0b99d589 | 743 | |
f1e51745 | 744 | if (ch->ch_pun.un_open_count > 0) |
0b99d589 | 745 | tty_hangup(ch->ch_pun.un_tty); |
0b99d589 LL |
746 | } |
747 | ||
748 | /* | |
749 | * Make sure that our cached values reflect the current reality. | |
750 | */ | |
751 | if (virt_carrier == 1) | |
752 | ch->ch_flags |= CH_FCAR; | |
8b07d521 | 753 | else |
0b99d589 LL |
754 | ch->ch_flags &= ~CH_FCAR; |
755 | ||
756 | if (phys_carrier == 1) | |
757 | ch->ch_flags |= CH_CD; | |
758 | else | |
759 | ch->ch_flags &= ~CH_CD; | |
760 | } | |
761 | ||
762 | /* | |
763 | * Assign the custom baud rate to the channel structure | |
764 | */ | |
765 | static void dgnc_set_custom_speed(struct channel_t *ch, uint newrate) | |
766 | { | |
767 | int testdiv; | |
768 | int testrate_high; | |
8b07d521 | 769 | int testrate_low; |
0b99d589 LL |
770 | int deltahigh; |
771 | int deltalow; | |
772 | ||
93c76c9c DY |
773 | if (newrate <= 0) { |
774 | ch->ch_custom_speed = 0; | |
775 | return; | |
776 | } | |
0b99d589 LL |
777 | |
778 | /* | |
779 | * Since the divisor is stored in a 16-bit integer, we make sure | |
780 | * we don't allow any rates smaller than a 16-bit integer would allow. | |
781 | * And of course, rates above the dividend won't fly. | |
782 | */ | |
783 | if (newrate && newrate < ((ch->ch_bd->bd_dividend / 0xFFFF) + 1)) | |
0b7ceaa6 | 784 | newrate = (ch->ch_bd->bd_dividend / 0xFFFF) + 1; |
0b99d589 LL |
785 | |
786 | if (newrate && newrate > ch->ch_bd->bd_dividend) | |
90d2a471 | 787 | newrate = ch->ch_bd->bd_dividend; |
0b99d589 | 788 | |
93c76c9c | 789 | if (newrate > 0) { |
0b99d589 LL |
790 | testdiv = ch->ch_bd->bd_dividend / newrate; |
791 | ||
792 | /* | |
793 | * If we try to figure out what rate the board would use | |
794 | * with the test divisor, it will be either equal or higher | |
795 | * than the requested baud rate. If we then determine the | |
8b07d521 | 796 | * rate with a divisor one higher, we will get the next lower |
0b99d589 LL |
797 | * supported rate below the requested. |
798 | */ | |
799 | testrate_high = ch->ch_bd->bd_dividend / testdiv; | |
800 | testrate_low = ch->ch_bd->bd_dividend / (testdiv + 1); | |
801 | ||
802 | /* | |
803 | * If the rate for the requested divisor is correct, just | |
804 | * use it and be done. | |
805 | */ | |
93c76c9c DY |
806 | if (testrate_high != newrate) { |
807 | /* | |
851f306d CM |
808 | * Otherwise, pick the rate that is closer |
809 | * (i.e. whichever rate has a smaller delta). | |
93c76c9c DY |
810 | */ |
811 | deltahigh = testrate_high - newrate; | |
812 | deltalow = newrate - testrate_low; | |
0b99d589 | 813 | |
50667c67 | 814 | if (deltahigh < deltalow) |
93c76c9c | 815 | newrate = testrate_high; |
50667c67 | 816 | else |
93c76c9c | 817 | newrate = testrate_low; |
0b99d589 | 818 | } |
0b99d589 | 819 | } |
8b07d521 | 820 | |
0b99d589 | 821 | ch->ch_custom_speed = newrate; |
0b99d589 LL |
822 | } |
823 | ||
0b99d589 LL |
824 | void dgnc_check_queue_flow_control(struct channel_t *ch) |
825 | { | |
d09c1b96 | 826 | int qleft; |
0b99d589 LL |
827 | |
828 | /* Store how much space we have left in the queue */ | |
f7c851d4 CP |
829 | qleft = ch->ch_r_tail - ch->ch_r_head - 1; |
830 | if (qleft < 0) | |
0b99d589 LL |
831 | qleft += RQUEUEMASK + 1; |
832 | ||
833 | /* | |
834 | * Check to see if we should enforce flow control on our queue because | |
835 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
836 | * | |
837 | * NOTE: This is done based on what the current flow control of the | |
838 | * port is set for. | |
839 | * | |
840 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
841 | * This will cause the UART's FIFO to back up, and force | |
842 | * the RTS signal to be dropped. | |
843 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
844 | * the other side, in hopes it will stop sending data to us. | |
845 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
846 | * that gets sent into us when the queue fills up. | |
847 | */ | |
848 | if (qleft < 256) { | |
849 | /* HWFLOW */ | |
851f306d CM |
850 | if (ch->ch_digi.digi_flags & CTSPACE || |
851 | ch->ch_c_cflag & CRTSCTS) { | |
a82477c3 | 852 | if (!(ch->ch_flags & CH_RECEIVER_OFF)) { |
0b99d589 LL |
853 | ch->ch_bd->bd_ops->disable_receiver(ch); |
854 | ch->ch_flags |= (CH_RECEIVER_OFF); | |
0b99d589 LL |
855 | } |
856 | } | |
857 | /* SWFLOW */ | |
858 | else if (ch->ch_c_iflag & IXOFF) { | |
859 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
860 | ch->ch_bd->bd_ops->send_stop_character(ch); | |
861 | ch->ch_stops_sent++; | |
0b99d589 LL |
862 | } |
863 | } | |
0b99d589 LL |
864 | } |
865 | ||
866 | /* | |
867 | * Check to see if we should unenforce flow control because | |
868 | * ld (or user) finally read enuf data out of our queue. | |
869 | * | |
870 | * NOTE: This is done based on what the current flow control of the | |
871 | * port is set for. | |
872 | * | |
873 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
874 | * This will cause the UART's FIFO to raise RTS back up, | |
875 | * which will allow the other side to start sending data again. | |
876 | * 2) SWFLOW (IXOFF) - Send a start character to | |
877 | * the other side, so it will start sending data to us again. | |
878 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
879 | * other side, we don't need to do anything now. | |
880 | */ | |
881 | if (qleft > (RQUEUESIZE / 2)) { | |
882 | /* HWFLOW */ | |
851f306d CM |
883 | if (ch->ch_digi.digi_flags & RTSPACE || |
884 | ch->ch_c_cflag & CRTSCTS) { | |
0b99d589 LL |
885 | if (ch->ch_flags & CH_RECEIVER_OFF) { |
886 | ch->ch_bd->bd_ops->enable_receiver(ch); | |
887 | ch->ch_flags &= ~(CH_RECEIVER_OFF); | |
0b99d589 LL |
888 | } |
889 | } | |
890 | /* SWFLOW */ | |
891 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
892 | ch->ch_stops_sent = 0; | |
893 | ch->ch_bd->bd_ops->send_start_character(ch); | |
0b99d589 | 894 | } |
0b99d589 LL |
895 | } |
896 | } | |
897 | ||
0b99d589 LL |
898 | void dgnc_wakeup_writes(struct channel_t *ch) |
899 | { | |
900 | int qlen = 0; | |
a44b508a | 901 | unsigned long flags; |
0b99d589 LL |
902 | |
903 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
904 | return; | |
905 | ||
a44b508a | 906 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
907 | |
908 | /* | |
909 | * If channel now has space, wake up anyone waiting on the condition. | |
910 | */ | |
f7c851d4 CP |
911 | qlen = ch->ch_w_head - ch->ch_w_tail; |
912 | if (qlen < 0) | |
90d2a471 | 913 | qlen += WQUEUESIZE; |
0b99d589 LL |
914 | |
915 | if (qlen >= (WQUEUESIZE - 256)) { | |
a44b508a | 916 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
917 | return; |
918 | } | |
919 | ||
920 | if (ch->ch_tun.un_flags & UN_ISOPEN) { | |
6aa56785 | 921 | tty_wakeup(ch->ch_tun.un_tty); |
0b99d589 LL |
922 | |
923 | /* | |
924 | * If unit is set to wait until empty, check to make sure | |
925 | * the queue AND FIFO are both empty. | |
926 | */ | |
927 | if (ch->ch_tun.un_flags & UN_EMPTY) { | |
851f306d | 928 | if ((qlen == 0) && |
e352d3f1 | 929 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) { |
0b99d589 LL |
930 | ch->ch_tun.un_flags &= ~(UN_EMPTY); |
931 | ||
932 | /* | |
933 | * If RTS Toggle mode is on, whenever | |
934 | * the queue and UART is empty, keep RTS low. | |
935 | */ | |
936 | if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) { | |
937 | ch->ch_mostat &= ~(UART_MCR_RTS); | |
938 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
939 | } | |
940 | ||
941 | /* | |
942 | * If DTR Toggle mode is on, whenever | |
943 | * the queue and UART is empty, keep DTR low. | |
944 | */ | |
945 | if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) { | |
946 | ch->ch_mostat &= ~(UART_MCR_DTR); | |
947 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
948 | } | |
949 | } | |
950 | } | |
951 | ||
952 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); | |
953 | } | |
954 | ||
955 | if (ch->ch_pun.un_flags & UN_ISOPEN) { | |
6aa56785 | 956 | tty_wakeup(ch->ch_pun.un_tty); |
0b99d589 LL |
957 | |
958 | /* | |
959 | * If unit is set to wait until empty, check to make sure | |
960 | * the queue AND FIFO are both empty. | |
961 | */ | |
962 | if (ch->ch_pun.un_flags & UN_EMPTY) { | |
851f306d CM |
963 | if ((qlen == 0) && |
964 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) | |
0b99d589 | 965 | ch->ch_pun.un_flags &= ~(UN_EMPTY); |
0b99d589 LL |
966 | } |
967 | ||
968 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); | |
969 | } | |
970 | ||
a44b508a | 971 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
972 | } |
973 | ||
0b99d589 | 974 | /************************************************************************ |
8b07d521 | 975 | * |
0b99d589 | 976 | * TTY Entry points and helper functions |
8b07d521 | 977 | * |
0b99d589 LL |
978 | ************************************************************************/ |
979 | ||
980 | /* | |
981 | * dgnc_tty_open() | |
982 | * | |
983 | */ | |
984 | static int dgnc_tty_open(struct tty_struct *tty, struct file *file) | |
985 | { | |
03425f55 | 986 | struct dgnc_board *brd; |
0b99d589 LL |
987 | struct channel_t *ch; |
988 | struct un_t *un; | |
989 | uint major = 0; | |
990 | uint minor = 0; | |
991 | int rc = 0; | |
a44b508a | 992 | unsigned long flags; |
0b99d589 LL |
993 | |
994 | rc = 0; | |
995 | ||
996 | major = MAJOR(tty_devnum(tty)); | |
997 | minor = MINOR(tty_devnum(tty)); | |
998 | ||
50667c67 | 999 | if (major > 255) |
0b99d589 | 1000 | return -ENXIO; |
0b99d589 LL |
1001 | |
1002 | /* Get board pointer from our array of majors we have allocated */ | |
1003 | brd = dgnc_BoardsByMajor[major]; | |
50667c67 | 1004 | if (!brd) |
0b99d589 | 1005 | return -ENXIO; |
0b99d589 LL |
1006 | |
1007 | /* | |
1008 | * If board is not yet up to a state of READY, go to | |
1009 | * sleep waiting for it to happen or they cancel the open. | |
1010 | */ | |
1011 | rc = wait_event_interruptible(brd->state_wait, | |
e352d3f1 | 1012 | (brd->state & BOARD_READY)); |
0b99d589 | 1013 | |
50667c67 | 1014 | if (rc) |
0b99d589 | 1015 | return rc; |
0b99d589 | 1016 | |
a44b508a | 1017 | spin_lock_irqsave(&brd->bd_lock, flags); |
0b99d589 LL |
1018 | |
1019 | /* If opened device is greater than our number of ports, bail. */ | |
4bef52f3 | 1020 | if (PORT_NUM(minor) >= brd->nasync) { |
a44b508a | 1021 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1022 | return -ENXIO; |
1023 | } | |
1024 | ||
1025 | ch = brd->channels[PORT_NUM(minor)]; | |
1026 | if (!ch) { | |
a44b508a | 1027 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1028 | return -ENXIO; |
1029 | } | |
1030 | ||
1031 | /* Drop board lock */ | |
a44b508a | 1032 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1033 | |
1034 | /* Grab channel lock */ | |
a44b508a | 1035 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1036 | |
1037 | /* Figure out our type */ | |
1038 | if (!IS_PRINT(minor)) { | |
1039 | un = &brd->channels[PORT_NUM(minor)]->ch_tun; | |
1040 | un->un_type = DGNC_SERIAL; | |
2000c581 | 1041 | } else if (IS_PRINT(minor)) { |
0b99d589 LL |
1042 | un = &brd->channels[PORT_NUM(minor)]->ch_pun; |
1043 | un->un_type = DGNC_PRINT; | |
2000c581 | 1044 | } else { |
a44b508a | 1045 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1046 | return -ENXIO; |
1047 | } | |
1048 | ||
1049 | /* | |
1050 | * If the port is still in a previous open, and in a state | |
1051 | * where we simply cannot safely keep going, wait until the | |
1052 | * state clears. | |
1053 | */ | |
a44b508a | 1054 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1055 | |
851f306d CM |
1056 | rc = wait_event_interruptible(ch->ch_flags_wait, |
1057 | ((ch->ch_flags & CH_OPENING) == 0)); | |
0b99d589 LL |
1058 | |
1059 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 1060 | if (rc) |
0b99d589 | 1061 | return -EINTR; |
0b99d589 LL |
1062 | |
1063 | /* | |
1064 | * If either unit is in the middle of the fragile part of close, | |
1065 | * we just cannot touch the channel safely. | |
1066 | * Go to sleep, knowing that when the channel can be | |
1067 | * touched safely, the close routine will signal the | |
1068 | * ch_flags_wait to wake us back up. | |
1069 | */ | |
1070 | rc = wait_event_interruptible(ch->ch_flags_wait, | |
851f306d CM |
1071 | (((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & |
1072 | UN_CLOSING) == 0)); | |
0b99d589 LL |
1073 | |
1074 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 1075 | if (rc) |
0b99d589 | 1076 | return -EINTR; |
0b99d589 | 1077 | |
a44b508a | 1078 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1079 | |
0b99d589 LL |
1080 | /* Store our unit into driver_data, so we always have it available. */ |
1081 | tty->driver_data = un; | |
1082 | ||
0b99d589 LL |
1083 | /* |
1084 | * Initialize tty's | |
1085 | */ | |
1086 | if (!(un->un_flags & UN_ISOPEN)) { | |
1087 | /* Store important variables. */ | |
1088 | un->un_tty = tty; | |
1089 | ||
1090 | /* Maybe do something here to the TTY struct as well? */ | |
1091 | } | |
1092 | ||
0b99d589 LL |
1093 | /* |
1094 | * Allocate channel buffers for read/write/error. | |
1095 | * Set flag, so we don't get trounced on. | |
1096 | */ | |
1097 | ch->ch_flags |= (CH_OPENING); | |
1098 | ||
1099 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
a44b508a | 1100 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1101 | |
1102 | if (!ch->ch_rqueue) | |
52f9d668 | 1103 | ch->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1104 | if (!ch->ch_equeue) |
52f9d668 | 1105 | ch->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1106 | if (!ch->ch_wqueue) |
52f9d668 | 1107 | ch->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1108 | |
a44b508a | 1109 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1110 | |
1111 | ch->ch_flags &= ~(CH_OPENING); | |
1112 | wake_up_interruptible(&ch->ch_flags_wait); | |
1113 | ||
1114 | /* | |
1115 | * Initialize if neither terminal or printer is open. | |
1116 | */ | |
1117 | if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_ISOPEN)) { | |
0b99d589 LL |
1118 | /* |
1119 | * Flush input queues. | |
1120 | */ | |
587abd7b SL |
1121 | ch->ch_r_head = 0; |
1122 | ch->ch_r_tail = 0; | |
1123 | ch->ch_e_head = 0; | |
1124 | ch->ch_e_tail = 0; | |
1125 | ch->ch_w_head = 0; | |
1126 | ch->ch_w_tail = 0; | |
0b99d589 LL |
1127 | |
1128 | brd->bd_ops->flush_uart_write(ch); | |
1129 | brd->bd_ops->flush_uart_read(ch); | |
1130 | ||
1131 | ch->ch_flags = 0; | |
1132 | ch->ch_cached_lsr = 0; | |
1133 | ch->ch_stop_sending_break = 0; | |
1134 | ch->ch_stops_sent = 0; | |
1135 | ||
22e3de76 LL |
1136 | ch->ch_c_cflag = tty->termios.c_cflag; |
1137 | ch->ch_c_iflag = tty->termios.c_iflag; | |
1138 | ch->ch_c_oflag = tty->termios.c_oflag; | |
1139 | ch->ch_c_lflag = tty->termios.c_lflag; | |
1140 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
1141 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
1142 | |
1143 | /* | |
1144 | * Bring up RTS and DTR... | |
1145 | * Also handle RTS or DTR toggle if set. | |
1146 | */ | |
1147 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
1148 | ch->ch_mostat |= (UART_MCR_RTS); | |
1149 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
1150 | ch->ch_mostat |= (UART_MCR_DTR); | |
1151 | ||
1152 | /* Tell UART to init itself */ | |
1153 | brd->bd_ops->uart_init(ch); | |
1154 | } | |
1155 | ||
1156 | /* | |
1157 | * Run param in case we changed anything | |
1158 | */ | |
1159 | brd->bd_ops->param(tty); | |
1160 | ||
1161 | dgnc_carrier(ch); | |
1162 | ||
8b07d521 | 1163 | /* |
0b99d589 LL |
1164 | * follow protocol for opening port |
1165 | */ | |
1166 | ||
a44b508a | 1167 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1168 | |
1169 | rc = dgnc_block_til_ready(tty, file, ch); | |
1170 | ||
0b99d589 | 1171 | /* No going back now, increment our unit and channel counters */ |
a44b508a | 1172 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1173 | ch->ch_open_count++; |
1174 | un->un_open_count++; | |
1175 | un->un_flags |= (UN_ISOPEN); | |
a44b508a | 1176 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1177 | |
8f90ef80 | 1178 | return rc; |
0b99d589 LL |
1179 | } |
1180 | ||
8b07d521 | 1181 | /* |
0b99d589 LL |
1182 | * dgnc_block_til_ready() |
1183 | * | |
1184 | * Wait for DCD, if needed. | |
1185 | */ | |
851f306d CM |
1186 | static int dgnc_block_til_ready(struct tty_struct *tty, |
1187 | struct file *file, | |
1188 | struct channel_t *ch) | |
8b07d521 | 1189 | { |
0b99d589 LL |
1190 | int retval = 0; |
1191 | struct un_t *un = NULL; | |
a44b508a | 1192 | unsigned long flags; |
0b99d589 LL |
1193 | uint old_flags = 0; |
1194 | int sleep_on_un_flags = 0; | |
1195 | ||
851f306d CM |
1196 | if (!tty || tty->magic != TTY_MAGIC || !file || !ch || |
1197 | ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1198 | return -ENXIO; |
0b99d589 LL |
1199 | |
1200 | un = tty->driver_data; | |
50667c67 | 1201 | if (!un || un->magic != DGNC_UNIT_MAGIC) |
8f90ef80 | 1202 | return -ENXIO; |
0b99d589 | 1203 | |
a44b508a | 1204 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1205 | |
1206 | ch->ch_wopen++; | |
1207 | ||
1208 | /* Loop forever */ | |
1209 | while (1) { | |
0b99d589 LL |
1210 | sleep_on_un_flags = 0; |
1211 | ||
1212 | /* | |
851f306d CM |
1213 | * If board has failed somehow during our sleep, |
1214 | * bail with error. | |
0b99d589 LL |
1215 | */ |
1216 | if (ch->ch_bd->state == BOARD_FAILED) { | |
1217 | retval = -ENXIO; | |
1218 | break; | |
1219 | } | |
1220 | ||
1221 | /* If tty was hung up, break out of loop and set error. */ | |
1222 | if (tty_hung_up_p(file)) { | |
1223 | retval = -EAGAIN; | |
1224 | break; | |
1225 | } | |
1226 | ||
1227 | /* | |
1228 | * If either unit is in the middle of the fragile part of close, | |
1229 | * we just cannot touch the channel safely. | |
1230 | * Go back to sleep, knowing that when the channel can be | |
8b07d521 | 1231 | * touched safely, the close routine will signal the |
0b99d589 LL |
1232 | * ch_wait_flags to wake us back up. |
1233 | */ | |
851f306d CM |
1234 | if (!((ch->ch_tun.un_flags | |
1235 | ch->ch_pun.un_flags) & | |
1236 | UN_CLOSING)) { | |
0b99d589 LL |
1237 | /* |
1238 | * Our conditions to leave cleanly and happily: | |
1239 | * 1) NONBLOCKING on the tty is set. | |
1240 | * 2) CLOCAL is set. | |
1241 | * 3) DCD (fake or real) is active. | |
1242 | */ | |
1243 | ||
50667c67 | 1244 | if (file->f_flags & O_NONBLOCK) |
0b99d589 | 1245 | break; |
0b99d589 LL |
1246 | |
1247 | if (tty->flags & (1 << TTY_IO_ERROR)) { | |
1248 | retval = -EIO; | |
1249 | break; | |
1250 | } | |
1251 | ||
f1e51745 | 1252 | if (ch->ch_flags & CH_CD) |
0b99d589 | 1253 | break; |
0b99d589 | 1254 | |
f1e51745 | 1255 | if (ch->ch_flags & CH_FCAR) |
0b99d589 | 1256 | break; |
2000c581 | 1257 | } else { |
0b99d589 LL |
1258 | sleep_on_un_flags = 1; |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * If there is a signal pending, the user probably | |
1263 | * interrupted (ctrl-c) us. | |
1264 | * Leave loop with error set. | |
1265 | */ | |
1266 | if (signal_pending(current)) { | |
0b99d589 LL |
1267 | retval = -ERESTARTSYS; |
1268 | break; | |
1269 | } | |
1270 | ||
0b99d589 LL |
1271 | /* |
1272 | * Store the flags before we let go of channel lock | |
1273 | */ | |
1274 | if (sleep_on_un_flags) | |
1275 | old_flags = ch->ch_tun.un_flags | ch->ch_pun.un_flags; | |
1276 | else | |
1277 | old_flags = ch->ch_flags; | |
1278 | ||
1279 | /* | |
1280 | * Let go of channel lock before calling schedule. | |
1281 | * Our poller will get any FEP events and wake us up when DCD | |
1282 | * eventually goes active. | |
1283 | */ | |
1284 | ||
a44b508a | 1285 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1286 | |
0b99d589 | 1287 | /* |
851f306d CM |
1288 | * Wait for something in the flags to change |
1289 | * from the current value. | |
0b99d589 | 1290 | */ |
50667c67 | 1291 | if (sleep_on_un_flags) |
0b99d589 | 1292 | retval = wait_event_interruptible(un->un_flags_wait, |
851f306d CM |
1293 | (old_flags != (ch->ch_tun.un_flags | |
1294 | ch->ch_pun.un_flags))); | |
50667c67 | 1295 | else |
0b99d589 LL |
1296 | retval = wait_event_interruptible(ch->ch_flags_wait, |
1297 | (old_flags != ch->ch_flags)); | |
0b99d589 | 1298 | |
0b99d589 LL |
1299 | /* |
1300 | * We got woken up for some reason. | |
1301 | * Before looping around, grab our channel lock. | |
1302 | */ | |
a44b508a | 1303 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1304 | } |
1305 | ||
1306 | ch->ch_wopen--; | |
1307 | ||
a44b508a | 1308 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1309 | |
36e712a8 | 1310 | return retval; |
0b99d589 LL |
1311 | } |
1312 | ||
0b99d589 LL |
1313 | /* |
1314 | * dgnc_tty_hangup() | |
1315 | * | |
1316 | * Hangup the port. Like a close, but don't wait for output to drain. | |
8b07d521 | 1317 | */ |
0b99d589 LL |
1318 | static void dgnc_tty_hangup(struct tty_struct *tty) |
1319 | { | |
1320 | struct un_t *un; | |
1321 | ||
1322 | if (!tty || tty->magic != TTY_MAGIC) | |
1323 | return; | |
1324 | ||
1325 | un = tty->driver_data; | |
1326 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1327 | return; | |
1328 | ||
0b99d589 LL |
1329 | /* flush the transmit queues */ |
1330 | dgnc_tty_flush_buffer(tty); | |
0b99d589 LL |
1331 | } |
1332 | ||
0b99d589 LL |
1333 | /* |
1334 | * dgnc_tty_close() | |
1335 | * | |
1336 | */ | |
1337 | static void dgnc_tty_close(struct tty_struct *tty, struct file *file) | |
1338 | { | |
03425f55 | 1339 | struct dgnc_board *bd; |
0b99d589 LL |
1340 | struct channel_t *ch; |
1341 | struct un_t *un; | |
a44b508a | 1342 | unsigned long flags; |
0b99d589 LL |
1343 | |
1344 | if (!tty || tty->magic != TTY_MAGIC) | |
1345 | return; | |
1346 | ||
1347 | un = tty->driver_data; | |
1348 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1349 | return; | |
1350 | ||
1351 | ch = un->un_ch; | |
1352 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1353 | return; | |
1354 | ||
1355 | bd = ch->ch_bd; | |
1356 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1357 | return; | |
1358 | ||
a44b508a | 1359 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1360 | |
1361 | /* | |
1362 | * Determine if this is the last close or not - and if we agree about | |
1363 | * which type of close it is with the Line Discipline | |
1364 | */ | |
1365 | if ((tty->count == 1) && (un->un_open_count != 1)) { | |
1366 | /* | |
1367 | * Uh, oh. tty->count is 1, which means that the tty | |
1368 | * structure will be freed. un_open_count should always | |
1369 | * be one in these conditions. If it's greater than | |
1370 | * one, we've got real problems, since it means the | |
1371 | * serial port won't be shutdown. | |
1372 | */ | |
1f26adc9 RD |
1373 | dev_dbg(tty->dev, |
1374 | "tty->count is 1, un open count is %d\n", | |
1375 | un->un_open_count); | |
0b99d589 | 1376 | un->un_open_count = 1; |
8b07d521 | 1377 | } |
0b99d589 | 1378 | |
3098e514 DY |
1379 | if (un->un_open_count) |
1380 | un->un_open_count--; | |
1381 | else | |
1f26adc9 RD |
1382 | dev_dbg(tty->dev, |
1383 | "bad serial port open count of %d\n", | |
1384 | un->un_open_count); | |
0b99d589 LL |
1385 | |
1386 | ch->ch_open_count--; | |
1387 | ||
1388 | if (ch->ch_open_count && un->un_open_count) { | |
a44b508a | 1389 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
90d2a471 LL |
1390 | return; |
1391 | } | |
0b99d589 LL |
1392 | |
1393 | /* OK, its the last close on the unit */ | |
0b99d589 LL |
1394 | un->un_flags |= UN_CLOSING; |
1395 | ||
1396 | tty->closing = 1; | |
1397 | ||
0b99d589 LL |
1398 | /* |
1399 | * Only officially close channel if count is 0 and | |
90d2a471 | 1400 | * DIGI_PRINTER bit is not set. |
0b99d589 | 1401 | */ |
851f306d CM |
1402 | if ((ch->ch_open_count == 0) && |
1403 | !(ch->ch_digi.digi_flags & DIGI_PRINTER)) { | |
0b99d589 LL |
1404 | ch->ch_flags &= ~(CH_STOPI | CH_FORCED_STOPI); |
1405 | ||
1406 | /* | |
1407 | * turn off print device when closing print device. | |
1408 | */ | |
9cdf838b | 1409 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1410 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1411 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1412 | ch->ch_flags &= ~CH_PRON; |
1413 | } | |
1414 | ||
a44b508a | 1415 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1416 | /* wait for output to drain */ |
1417 | /* This will also return if we take an interrupt */ | |
1418 | ||
2d9920ec | 1419 | bd->bd_ops->drain(tty, 0); |
0b99d589 | 1420 | |
0b99d589 LL |
1421 | dgnc_tty_flush_buffer(tty); |
1422 | tty_ldisc_flush(tty); | |
1423 | ||
a44b508a | 1424 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1425 | |
1426 | tty->closing = 0; | |
1427 | ||
1428 | /* | |
1429 | * If we have HUPCL set, lower DTR and RTS | |
1430 | */ | |
1431 | if (ch->ch_c_cflag & HUPCL) { | |
0b99d589 LL |
1432 | /* Drop RTS/DTR */ |
1433 | ch->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
1434 | bd->bd_ops->assert_modem_signals(ch); | |
1435 | ||
1436 | /* | |
8b07d521 | 1437 | * Go to sleep to ensure RTS/DTR |
0b99d589 LL |
1438 | * have been dropped for modems to see it. |
1439 | */ | |
1440 | if (ch->ch_close_delay) { | |
a44b508a RD |
1441 | spin_unlock_irqrestore(&ch->ch_lock, |
1442 | flags); | |
0b99d589 | 1443 | dgnc_ms_sleep(ch->ch_close_delay); |
a44b508a | 1444 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1445 | } |
1446 | } | |
1447 | ||
1448 | ch->ch_old_baud = 0; | |
1449 | ||
1450 | /* Turn off UART interrupts for this port */ | |
1451 | ch->ch_bd->bd_ops->uart_off(ch); | |
2000c581 | 1452 | } else { |
0b99d589 LL |
1453 | /* |
1454 | * turn off print device when closing print device. | |
1455 | */ | |
9cdf838b | 1456 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1457 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1458 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1459 | ch->ch_flags &= ~CH_PRON; |
1460 | } | |
1461 | } | |
1462 | ||
1463 | un->un_tty = NULL; | |
1464 | un->un_flags &= ~(UN_ISOPEN | UN_CLOSING); | |
1465 | ||
0b99d589 LL |
1466 | wake_up_interruptible(&ch->ch_flags_wait); |
1467 | wake_up_interruptible(&un->un_flags_wait); | |
1468 | ||
a44b508a | 1469 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1470 | } |
1471 | ||
0b99d589 LL |
1472 | /* |
1473 | * dgnc_tty_chars_in_buffer() | |
1474 | * | |
1475 | * Return number of characters that have not been transmitted yet. | |
1476 | * | |
1477 | * This routine is used by the line discipline to determine if there | |
1478 | * is data waiting to be transmitted/drained/flushed or not. | |
1479 | */ | |
1480 | static int dgnc_tty_chars_in_buffer(struct tty_struct *tty) | |
1481 | { | |
1482 | struct channel_t *ch = NULL; | |
1483 | struct un_t *un = NULL; | |
1484 | ushort thead; | |
1485 | ushort ttail; | |
1486 | uint tmask; | |
1487 | uint chars = 0; | |
a44b508a | 1488 | unsigned long flags; |
0b99d589 | 1489 | |
60acb623 | 1490 | if (!tty) |
8f90ef80 | 1491 | return 0; |
0b99d589 LL |
1492 | |
1493 | un = tty->driver_data; | |
1494 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1495 | return 0; |
0b99d589 LL |
1496 | |
1497 | ch = un->un_ch; | |
1498 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1499 | return 0; |
0b99d589 | 1500 | |
a44b508a | 1501 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1502 | |
1503 | tmask = WQUEUEMASK; | |
1504 | thead = ch->ch_w_head & tmask; | |
1505 | ttail = ch->ch_w_tail & tmask; | |
1506 | ||
a44b508a | 1507 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1508 | |
1509 | if (ttail == thead) { | |
1510 | chars = 0; | |
1511 | } else { | |
1512 | if (thead >= ttail) | |
1513 | chars = thead - ttail; | |
1514 | else | |
1515 | chars = thead - ttail + WQUEUESIZE; | |
1516 | } | |
1517 | ||
8f90ef80 | 1518 | return chars; |
0b99d589 LL |
1519 | } |
1520 | ||
8b07d521 | 1521 | /* |
0b99d589 LL |
1522 | * dgnc_maxcps_room |
1523 | * | |
1524 | * Reduces bytes_available to the max number of characters | |
1525 | * that can be sent currently given the maxcps value, and | |
1526 | * returns the new bytes_available. This only affects printer | |
1527 | * output. | |
8b07d521 | 1528 | */ |
0b99d589 LL |
1529 | static int dgnc_maxcps_room(struct tty_struct *tty, int bytes_available) |
1530 | { | |
1531 | struct channel_t *ch = NULL; | |
1532 | struct un_t *un = NULL; | |
1533 | ||
1534 | if (!tty) | |
8f90ef80 | 1535 | return bytes_available; |
0b99d589 LL |
1536 | |
1537 | un = tty->driver_data; | |
1538 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1539 | return bytes_available; |
0b99d589 LL |
1540 | |
1541 | ch = un->un_ch; | |
1542 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1543 | return bytes_available; |
0b99d589 LL |
1544 | |
1545 | /* | |
1546 | * If its not the Transparent print device, return | |
1547 | * the full data amount. | |
1548 | */ | |
1549 | if (un->un_type != DGNC_PRINT) | |
8f90ef80 | 1550 | return bytes_available; |
0b99d589 | 1551 | |
9cdf838b | 1552 | if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0) { |
0b99d589 LL |
1553 | int cps_limit = 0; |
1554 | unsigned long current_time = jiffies; | |
1555 | unsigned long buffer_time = current_time + | |
851f306d CM |
1556 | (HZ * ch->ch_digi.digi_bufsize) / |
1557 | ch->ch_digi.digi_maxcps; | |
0b99d589 LL |
1558 | |
1559 | if (ch->ch_cpstime < current_time) { | |
1560 | /* buffer is empty */ | |
851f306d | 1561 | ch->ch_cpstime = current_time; /* reset ch_cpstime */ |
0b99d589 | 1562 | cps_limit = ch->ch_digi.digi_bufsize; |
2000c581 | 1563 | } else if (ch->ch_cpstime < buffer_time) { |
0b99d589 | 1564 | /* still room in the buffer */ |
851f306d CM |
1565 | cps_limit = ((buffer_time - ch->ch_cpstime) * |
1566 | ch->ch_digi.digi_maxcps) / HZ; | |
2000c581 | 1567 | } else { |
0b99d589 | 1568 | /* no room in the buffer */ |
8b07d521 | 1569 | cps_limit = 0; |
0b99d589 LL |
1570 | } |
1571 | ||
1572 | bytes_available = min(cps_limit, bytes_available); | |
1573 | } | |
1574 | ||
8f90ef80 | 1575 | return bytes_available; |
0b99d589 LL |
1576 | } |
1577 | ||
0b99d589 LL |
1578 | /* |
1579 | * dgnc_tty_write_room() | |
1580 | * | |
1581 | * Return space available in Tx buffer | |
8b07d521 | 1582 | */ |
0b99d589 LL |
1583 | static int dgnc_tty_write_room(struct tty_struct *tty) |
1584 | { | |
1585 | struct channel_t *ch = NULL; | |
1586 | struct un_t *un = NULL; | |
1587 | ushort head; | |
1588 | ushort tail; | |
1589 | ushort tmask; | |
1590 | int ret = 0; | |
a44b508a | 1591 | unsigned long flags; |
0b99d589 | 1592 | |
60acb623 | 1593 | if (!tty || !dgnc_TmpWriteBuf) |
8f90ef80 | 1594 | return 0; |
0b99d589 LL |
1595 | |
1596 | un = tty->driver_data; | |
1597 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1598 | return 0; |
0b99d589 LL |
1599 | |
1600 | ch = un->un_ch; | |
1601 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1602 | return 0; |
0b99d589 | 1603 | |
a44b508a | 1604 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1605 | |
1606 | tmask = WQUEUEMASK; | |
1607 | head = (ch->ch_w_head) & tmask; | |
1608 | tail = (ch->ch_w_tail) & tmask; | |
1609 | ||
f7c851d4 CP |
1610 | ret = tail - head - 1; |
1611 | if (ret < 0) | |
0b99d589 LL |
1612 | ret += WQUEUESIZE; |
1613 | ||
1614 | /* Limit printer to maxcps */ | |
1615 | ret = dgnc_maxcps_room(tty, ret); | |
1616 | ||
1617 | /* | |
8b07d521 | 1618 | * If we are printer device, leave space for |
0b99d589 LL |
1619 | * possibly both the on and off strings. |
1620 | */ | |
1621 | if (un->un_type == DGNC_PRINT) { | |
1622 | if (!(ch->ch_flags & CH_PRON)) | |
1623 | ret -= ch->ch_digi.digi_onlen; | |
1624 | ret -= ch->ch_digi.digi_offlen; | |
2000c581 | 1625 | } else { |
0b99d589 LL |
1626 | if (ch->ch_flags & CH_PRON) |
1627 | ret -= ch->ch_digi.digi_offlen; | |
1628 | } | |
1629 | ||
1630 | if (ret < 0) | |
1631 | ret = 0; | |
1632 | ||
a44b508a | 1633 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8b07d521 | 1634 | |
8f90ef80 | 1635 | return ret; |
0b99d589 LL |
1636 | } |
1637 | ||
0b99d589 LL |
1638 | /* |
1639 | * dgnc_tty_put_char() | |
1640 | * | |
1641 | * Put a character into ch->ch_buf | |
8b07d521 | 1642 | * |
0b99d589 LL |
1643 | * - used by the line discipline for OPOST processing |
1644 | */ | |
1645 | static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c) | |
1646 | { | |
1647 | /* | |
1648 | * Simply call tty_write. | |
1649 | */ | |
0b99d589 LL |
1650 | dgnc_tty_write(tty, &c, 1); |
1651 | return 1; | |
1652 | } | |
1653 | ||
0b99d589 LL |
1654 | /* |
1655 | * dgnc_tty_write() | |
1656 | * | |
1657 | * Take data from the user or kernel and send it out to the FEP. | |
1658 | * In here exists all the Transparent Print magic as well. | |
1659 | */ | |
1660 | static int dgnc_tty_write(struct tty_struct *tty, | |
e352d3f1 | 1661 | const unsigned char *buf, int count) |
0b99d589 LL |
1662 | { |
1663 | struct channel_t *ch = NULL; | |
1664 | struct un_t *un = NULL; | |
1665 | int bufcount = 0, n = 0; | |
a44b508a | 1666 | unsigned long flags; |
0b99d589 LL |
1667 | ushort head; |
1668 | ushort tail; | |
1669 | ushort tmask; | |
1670 | uint remain; | |
0b99d589 | 1671 | |
60acb623 | 1672 | if (!tty || !dgnc_TmpWriteBuf) |
8f90ef80 | 1673 | return 0; |
0b99d589 LL |
1674 | |
1675 | un = tty->driver_data; | |
1676 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1677 | return 0; |
0b99d589 LL |
1678 | |
1679 | ch = un->un_ch; | |
1680 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1681 | return 0; |
0b99d589 LL |
1682 | |
1683 | if (!count) | |
8f90ef80 | 1684 | return 0; |
0b99d589 | 1685 | |
0b99d589 LL |
1686 | /* |
1687 | * Store original amount of characters passed in. | |
1688 | * This helps to figure out if we should ask the FEP | |
1689 | * to send us an event when it has more space available. | |
1690 | */ | |
0b99d589 | 1691 | |
a44b508a | 1692 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1693 | |
1694 | /* Get our space available for the channel from the board */ | |
1695 | tmask = WQUEUEMASK; | |
1696 | head = (ch->ch_w_head) & tmask; | |
1697 | tail = (ch->ch_w_tail) & tmask; | |
1698 | ||
f7c851d4 CP |
1699 | bufcount = tail - head - 1; |
1700 | if (bufcount < 0) | |
0b99d589 LL |
1701 | bufcount += WQUEUESIZE; |
1702 | ||
0b99d589 LL |
1703 | /* |
1704 | * Limit printer output to maxcps overall, with bursts allowed | |
1705 | * up to bufsize characters. | |
1706 | */ | |
1707 | bufcount = dgnc_maxcps_room(tty, bufcount); | |
1708 | ||
1709 | /* | |
1710 | * Take minimum of what the user wants to send, and the | |
1711 | * space available in the FEP buffer. | |
1712 | */ | |
1713 | count = min(count, bufcount); | |
1714 | ||
1715 | /* | |
1716 | * Bail if no space left. | |
1717 | */ | |
c84a083b QL |
1718 | if (count <= 0) |
1719 | goto exit_retry; | |
0b99d589 LL |
1720 | |
1721 | /* | |
1722 | * Output the printer ON string, if we are in terminal mode, but | |
1723 | * need to be in printer mode. | |
1724 | */ | |
1725 | if ((un->un_type == DGNC_PRINT) && !(ch->ch_flags & CH_PRON)) { | |
1726 | dgnc_wmove(ch, ch->ch_digi.digi_onstr, | |
e352d3f1 | 1727 | (int)ch->ch_digi.digi_onlen); |
0b99d589 LL |
1728 | head = (ch->ch_w_head) & tmask; |
1729 | ch->ch_flags |= CH_PRON; | |
1730 | } | |
1731 | ||
1732 | /* | |
1733 | * On the other hand, output the printer OFF string, if we are | |
1734 | * currently in printer mode, but need to output to the terminal. | |
1735 | */ | |
1736 | if ((un->un_type != DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { | |
1737 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, | |
e352d3f1 | 1738 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1739 | head = (ch->ch_w_head) & tmask; |
1740 | ch->ch_flags &= ~CH_PRON; | |
1741 | } | |
1742 | ||
0b99d589 LL |
1743 | n = count; |
1744 | ||
1745 | /* | |
1746 | * If the write wraps over the top of the circular buffer, | |
1747 | * move the portion up to the wrap point, and reset the | |
1748 | * pointers to the bottom. | |
1749 | */ | |
1750 | remain = WQUEUESIZE - head; | |
1751 | ||
1752 | if (n >= remain) { | |
1753 | n -= remain; | |
1754 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1755 | head = 0; |
1756 | buf += remain; | |
1757 | } | |
1758 | ||
1759 | if (n > 0) { | |
1760 | /* | |
1761 | * Move rest of data. | |
1762 | */ | |
1763 | remain = n; | |
1764 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1765 | head += remain; |
1766 | } | |
1767 | ||
1768 | if (count) { | |
1769 | head &= tmask; | |
1770 | ch->ch_w_head = head; | |
1771 | } | |
1772 | ||
0b99d589 | 1773 | /* Update printer buffer empty time. */ |
8d0d4cc5 RS |
1774 | if ((un->un_type == DGNC_PRINT) && (ch->ch_digi.digi_maxcps > 0) && |
1775 | (ch->ch_digi.digi_bufsize > 0)) { | |
90d2a471 | 1776 | ch->ch_cpstime += (HZ * count) / ch->ch_digi.digi_maxcps; |
0b99d589 LL |
1777 | } |
1778 | ||
a74d8e21 | 1779 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1780 | |
0b99d589 LL |
1781 | if (count) { |
1782 | /* | |
1783 | * Channel lock is grabbed and then released | |
1784 | * inside this routine. | |
1785 | */ | |
1786 | ch->ch_bd->bd_ops->copy_data_from_queue_to_uart(ch); | |
1787 | } | |
1788 | ||
8f90ef80 | 1789 | return count; |
c84a083b QL |
1790 | |
1791 | exit_retry: | |
1792 | ||
1793 | spin_unlock_irqrestore(&ch->ch_lock, flags); | |
1794 | return 0; | |
0b99d589 LL |
1795 | } |
1796 | ||
0b99d589 LL |
1797 | /* |
1798 | * Return modem signals to ld. | |
1799 | */ | |
b74c7461 | 1800 | |
0b99d589 | 1801 | static int dgnc_tty_tiocmget(struct tty_struct *tty) |
0b99d589 LL |
1802 | { |
1803 | struct channel_t *ch; | |
1804 | struct un_t *un; | |
1805 | int result = -EIO; | |
446393e9 | 1806 | unsigned char mstat = 0; |
a44b508a | 1807 | unsigned long flags; |
0b99d589 LL |
1808 | |
1809 | if (!tty || tty->magic != TTY_MAGIC) | |
1810 | return result; | |
1811 | ||
1812 | un = tty->driver_data; | |
1813 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1814 | return result; | |
1815 | ||
1816 | ch = un->un_ch; | |
1817 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1818 | return result; | |
1819 | ||
a44b508a | 1820 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1821 | |
0b7ceaa6 | 1822 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1823 | |
a44b508a | 1824 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1825 | |
1826 | result = 0; | |
1827 | ||
1828 | if (mstat & UART_MCR_DTR) | |
1829 | result |= TIOCM_DTR; | |
1830 | if (mstat & UART_MCR_RTS) | |
1831 | result |= TIOCM_RTS; | |
1832 | if (mstat & UART_MSR_CTS) | |
1833 | result |= TIOCM_CTS; | |
1834 | if (mstat & UART_MSR_DSR) | |
1835 | result |= TIOCM_DSR; | |
1836 | if (mstat & UART_MSR_RI) | |
1837 | result |= TIOCM_RI; | |
1838 | if (mstat & UART_MSR_DCD) | |
1839 | result |= TIOCM_CD; | |
1840 | ||
0b99d589 LL |
1841 | return result; |
1842 | } | |
1843 | ||
0b99d589 LL |
1844 | /* |
1845 | * dgnc_tty_tiocmset() | |
1846 | * | |
1847 | * Set modem signals, called by ld. | |
1848 | */ | |
b74c7461 | 1849 | |
0b99d589 | 1850 | static int dgnc_tty_tiocmset(struct tty_struct *tty, |
e352d3f1 | 1851 | unsigned int set, unsigned int clear) |
0b99d589 | 1852 | { |
03425f55 | 1853 | struct dgnc_board *bd; |
0b99d589 LL |
1854 | struct channel_t *ch; |
1855 | struct un_t *un; | |
1856 | int ret = -EIO; | |
a44b508a | 1857 | unsigned long flags; |
0b99d589 LL |
1858 | |
1859 | if (!tty || tty->magic != TTY_MAGIC) | |
1860 | return ret; | |
1861 | ||
1862 | un = tty->driver_data; | |
1863 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1864 | return ret; | |
1865 | ||
1866 | ch = un->un_ch; | |
1867 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1868 | return ret; | |
1869 | ||
1870 | bd = ch->ch_bd; | |
1871 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1872 | return ret; | |
1873 | ||
a44b508a | 1874 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1875 | |
50667c67 | 1876 | if (set & TIOCM_RTS) |
0b99d589 | 1877 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 1878 | |
50667c67 | 1879 | if (set & TIOCM_DTR) |
0b99d589 | 1880 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 | 1881 | |
50667c67 | 1882 | if (clear & TIOCM_RTS) |
0b99d589 | 1883 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 1884 | |
50667c67 | 1885 | if (clear & TIOCM_DTR) |
0b99d589 | 1886 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
1887 | |
1888 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
1889 | ||
a44b508a | 1890 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1891 | |
8f90ef80 | 1892 | return 0; |
0b99d589 LL |
1893 | } |
1894 | ||
0b99d589 LL |
1895 | /* |
1896 | * dgnc_tty_send_break() | |
1897 | * | |
1898 | * Send a Break, called by ld. | |
1899 | */ | |
1900 | static int dgnc_tty_send_break(struct tty_struct *tty, int msec) | |
1901 | { | |
03425f55 | 1902 | struct dgnc_board *bd; |
0b99d589 LL |
1903 | struct channel_t *ch; |
1904 | struct un_t *un; | |
1905 | int ret = -EIO; | |
a44b508a | 1906 | unsigned long flags; |
0b99d589 LL |
1907 | |
1908 | if (!tty || tty->magic != TTY_MAGIC) | |
1909 | return ret; | |
1910 | ||
1911 | un = tty->driver_data; | |
1912 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1913 | return ret; | |
1914 | ||
1915 | ch = un->un_ch; | |
1916 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1917 | return ret; | |
1918 | ||
1919 | bd = ch->ch_bd; | |
1920 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1921 | return ret; | |
1922 | ||
1923 | switch (msec) { | |
1924 | case -1: | |
1925 | msec = 0xFFFF; | |
1926 | break; | |
1927 | case 0: | |
1928 | msec = 0; | |
1929 | break; | |
1930 | default: | |
1931 | break; | |
1932 | } | |
1933 | ||
a44b508a | 1934 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1935 | |
1936 | ch->ch_bd->bd_ops->send_break(ch, msec); | |
1937 | ||
a44b508a | 1938 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1939 | |
8f90ef80 | 1940 | return 0; |
0b99d589 LL |
1941 | } |
1942 | ||
0b99d589 LL |
1943 | /* |
1944 | * dgnc_tty_wait_until_sent() | |
1945 | * | |
1946 | * wait until data has been transmitted, called by ld. | |
1947 | */ | |
1948 | static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
1949 | { | |
03425f55 | 1950 | struct dgnc_board *bd; |
0b99d589 LL |
1951 | struct channel_t *ch; |
1952 | struct un_t *un; | |
0b99d589 LL |
1953 | |
1954 | if (!tty || tty->magic != TTY_MAGIC) | |
1955 | return; | |
1956 | ||
1957 | un = tty->driver_data; | |
1958 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1959 | return; | |
1960 | ||
1961 | ch = un->un_ch; | |
1962 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1963 | return; | |
1964 | ||
1965 | bd = ch->ch_bd; | |
1966 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1967 | return; | |
1968 | ||
2d9920ec | 1969 | bd->bd_ops->drain(tty, 0); |
8b07d521 | 1970 | } |
0b99d589 | 1971 | |
0b99d589 LL |
1972 | /* |
1973 | * dgnc_send_xchar() | |
1974 | * | |
1975 | * send a high priority character, called by ld. | |
1976 | */ | |
1977 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char c) | |
1978 | { | |
03425f55 | 1979 | struct dgnc_board *bd; |
0b99d589 LL |
1980 | struct channel_t *ch; |
1981 | struct un_t *un; | |
a44b508a | 1982 | unsigned long flags; |
0b99d589 LL |
1983 | |
1984 | if (!tty || tty->magic != TTY_MAGIC) | |
1985 | return; | |
1986 | ||
1987 | un = tty->driver_data; | |
1988 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1989 | return; | |
1990 | ||
1991 | ch = un->un_ch; | |
1992 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1993 | return; | |
1994 | ||
1995 | bd = ch->ch_bd; | |
1996 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1997 | return; | |
1998 | ||
f3dadd29 | 1999 | dev_dbg(tty->dev, "dgnc_tty_send_xchar start\n"); |
0b99d589 | 2000 | |
a44b508a | 2001 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2002 | bd->bd_ops->send_immediate_char(ch, c); |
a44b508a | 2003 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2004 | |
f3dadd29 | 2005 | dev_dbg(tty->dev, "dgnc_tty_send_xchar finish\n"); |
8b07d521 | 2006 | } |
0b99d589 | 2007 | |
0b99d589 LL |
2008 | /* |
2009 | * Return modem signals to ld. | |
2010 | */ | |
2011 | static inline int dgnc_get_mstat(struct channel_t *ch) | |
2012 | { | |
2013 | unsigned char mstat; | |
2014 | int result = -EIO; | |
a44b508a | 2015 | unsigned long flags; |
0b99d589 | 2016 | |
0b99d589 | 2017 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
8f90ef80 | 2018 | return -ENXIO; |
0b99d589 | 2019 | |
a44b508a | 2020 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2021 | |
0b7ceaa6 | 2022 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 2023 | |
a44b508a | 2024 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2025 | |
2026 | result = 0; | |
2027 | ||
2028 | if (mstat & UART_MCR_DTR) | |
2029 | result |= TIOCM_DTR; | |
2030 | if (mstat & UART_MCR_RTS) | |
2031 | result |= TIOCM_RTS; | |
2032 | if (mstat & UART_MSR_CTS) | |
2033 | result |= TIOCM_CTS; | |
2034 | if (mstat & UART_MSR_DSR) | |
2035 | result |= TIOCM_DSR; | |
2036 | if (mstat & UART_MSR_RI) | |
2037 | result |= TIOCM_RI; | |
2038 | if (mstat & UART_MSR_DCD) | |
2039 | result |= TIOCM_CD; | |
2040 | ||
8f90ef80 | 2041 | return result; |
0b99d589 LL |
2042 | } |
2043 | ||
0b99d589 LL |
2044 | /* |
2045 | * Return modem signals to ld. | |
2046 | */ | |
851f306d CM |
2047 | static int dgnc_get_modem_info(struct channel_t *ch, |
2048 | unsigned int __user *value) | |
0b99d589 LL |
2049 | { |
2050 | int result; | |
0b99d589 | 2051 | |
0b99d589 | 2052 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
8f90ef80 | 2053 | return -ENXIO; |
0b99d589 LL |
2054 | |
2055 | result = dgnc_get_mstat(ch); | |
2056 | ||
2057 | if (result < 0) | |
8f90ef80 | 2058 | return -ENXIO; |
0b99d589 | 2059 | |
3dfe7557 | 2060 | return put_user(result, value); |
0b99d589 LL |
2061 | } |
2062 | ||
0b99d589 LL |
2063 | /* |
2064 | * dgnc_set_modem_info() | |
2065 | * | |
2066 | * Set modem signals, called by ld. | |
2067 | */ | |
851f306d CM |
2068 | static int dgnc_set_modem_info(struct tty_struct *tty, |
2069 | unsigned int command, | |
2070 | unsigned int __user *value) | |
0b99d589 | 2071 | { |
03425f55 | 2072 | struct dgnc_board *bd; |
0b99d589 LL |
2073 | struct channel_t *ch; |
2074 | struct un_t *un; | |
2075 | int ret = -ENXIO; | |
2076 | unsigned int arg = 0; | |
a44b508a | 2077 | unsigned long flags; |
0b99d589 LL |
2078 | |
2079 | if (!tty || tty->magic != TTY_MAGIC) | |
2080 | return ret; | |
2081 | ||
2082 | un = tty->driver_data; | |
2083 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2084 | return ret; | |
2085 | ||
2086 | ch = un->un_ch; | |
2087 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2088 | return ret; | |
2089 | ||
2090 | bd = ch->ch_bd; | |
2091 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2092 | return ret; | |
2093 | ||
0b99d589 LL |
2094 | ret = get_user(arg, value); |
2095 | if (ret) | |
8f90ef80 | 2096 | return ret; |
0b99d589 LL |
2097 | |
2098 | switch (command) { | |
2099 | case TIOCMBIS: | |
50667c67 | 2100 | if (arg & TIOCM_RTS) |
0b99d589 | 2101 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 2102 | |
50667c67 | 2103 | if (arg & TIOCM_DTR) |
0b99d589 | 2104 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 LL |
2105 | |
2106 | break; | |
2107 | ||
2108 | case TIOCMBIC: | |
50667c67 | 2109 | if (arg & TIOCM_RTS) |
0b99d589 | 2110 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 2111 | |
50667c67 | 2112 | if (arg & TIOCM_DTR) |
0b99d589 | 2113 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
2114 | |
2115 | break; | |
2116 | ||
90d2a471 | 2117 | case TIOCMSET: |
0b99d589 | 2118 | |
50667c67 | 2119 | if (arg & TIOCM_RTS) |
0b99d589 | 2120 | ch->ch_mostat |= UART_MCR_RTS; |
50667c67 | 2121 | else |
0b99d589 | 2122 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 2123 | |
50667c67 | 2124 | if (arg & TIOCM_DTR) |
0b99d589 | 2125 | ch->ch_mostat |= UART_MCR_DTR; |
50667c67 | 2126 | else |
0b99d589 | 2127 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
2128 | |
2129 | break; | |
2130 | ||
2131 | default: | |
8f90ef80 | 2132 | return -EINVAL; |
0b99d589 LL |
2133 | } |
2134 | ||
a44b508a | 2135 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2136 | |
2137 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
2138 | ||
a44b508a | 2139 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2140 | |
8f90ef80 | 2141 | return 0; |
0b99d589 LL |
2142 | } |
2143 | ||
0b99d589 | 2144 | /* |
8b07d521 | 2145 | * dgnc_tty_digigeta() |
0b99d589 LL |
2146 | * |
2147 | * Ioctl to get the information for ditty. | |
2148 | * | |
2149 | * | |
2150 | * | |
2151 | */ | |
851f306d CM |
2152 | static int dgnc_tty_digigeta(struct tty_struct *tty, |
2153 | struct digi_t __user *retinfo) | |
0b99d589 LL |
2154 | { |
2155 | struct channel_t *ch; | |
2156 | struct un_t *un; | |
2157 | struct digi_t tmp; | |
a44b508a | 2158 | unsigned long flags; |
0b99d589 LL |
2159 | |
2160 | if (!retinfo) | |
8f90ef80 | 2161 | return -EFAULT; |
0b99d589 LL |
2162 | |
2163 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2164 | return -EFAULT; |
0b99d589 LL |
2165 | |
2166 | un = tty->driver_data; | |
2167 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2168 | return -EFAULT; |
0b99d589 LL |
2169 | |
2170 | ch = un->un_ch; | |
2171 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2172 | return -EFAULT; |
0b99d589 LL |
2173 | |
2174 | memset(&tmp, 0, sizeof(tmp)); | |
2175 | ||
a44b508a | 2176 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2177 | memcpy(&tmp, &ch->ch_digi, sizeof(tmp)); |
a44b508a | 2178 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2179 | |
2180 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) | |
8f90ef80 | 2181 | return -EFAULT; |
0b99d589 | 2182 | |
8f90ef80 | 2183 | return 0; |
0b99d589 LL |
2184 | } |
2185 | ||
0b99d589 | 2186 | /* |
8b07d521 | 2187 | * dgnc_tty_digiseta() |
0b99d589 LL |
2188 | * |
2189 | * Ioctl to set the information for ditty. | |
2190 | * | |
2191 | * | |
2192 | * | |
2193 | */ | |
851f306d CM |
2194 | static int dgnc_tty_digiseta(struct tty_struct *tty, |
2195 | struct digi_t __user *new_info) | |
0b99d589 | 2196 | { |
03425f55 | 2197 | struct dgnc_board *bd; |
0b99d589 LL |
2198 | struct channel_t *ch; |
2199 | struct un_t *un; | |
2200 | struct digi_t new_digi; | |
a44b508a | 2201 | unsigned long flags; |
0b99d589 | 2202 | |
0b99d589 | 2203 | if (!tty || tty->magic != TTY_MAGIC) |
8f90ef80 | 2204 | return -EFAULT; |
0b99d589 LL |
2205 | |
2206 | un = tty->driver_data; | |
2207 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2208 | return -EFAULT; |
0b99d589 LL |
2209 | |
2210 | ch = un->un_ch; | |
2211 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2212 | return -EFAULT; |
0b99d589 LL |
2213 | |
2214 | bd = ch->ch_bd; | |
2215 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2216 | return -EFAULT; |
0b99d589 | 2217 | |
f1e51745 | 2218 | if (copy_from_user(&new_digi, new_info, sizeof(new_digi))) |
8f90ef80 | 2219 | return -EFAULT; |
0b99d589 | 2220 | |
a44b508a | 2221 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2222 | |
2223 | /* | |
2224 | * Handle transistions to and from RTS Toggle. | |
2225 | */ | |
851f306d CM |
2226 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2227 | (new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 | 2228 | ch->ch_mostat &= ~(UART_MCR_RTS); |
851f306d CM |
2229 | if ((ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2230 | !(new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 LL |
2231 | ch->ch_mostat |= (UART_MCR_RTS); |
2232 | ||
2233 | /* | |
2234 | * Handle transistions to and from DTR Toggle. | |
2235 | */ | |
851f306d CM |
2236 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2237 | (new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 | 2238 | ch->ch_mostat &= ~(UART_MCR_DTR); |
851f306d CM |
2239 | if ((ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2240 | !(new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 LL |
2241 | ch->ch_mostat |= (UART_MCR_DTR); |
2242 | ||
a07bf39a | 2243 | memcpy(&ch->ch_digi, &new_digi, sizeof(new_digi)); |
0b99d589 | 2244 | |
8b07d521 | 2245 | if (ch->ch_digi.digi_maxcps < 1) |
0b99d589 LL |
2246 | ch->ch_digi.digi_maxcps = 1; |
2247 | ||
8b07d521 | 2248 | if (ch->ch_digi.digi_maxcps > 10000) |
0b99d589 LL |
2249 | ch->ch_digi.digi_maxcps = 10000; |
2250 | ||
2251 | if (ch->ch_digi.digi_bufsize < 10) | |
2252 | ch->ch_digi.digi_bufsize = 10; | |
2253 | ||
2254 | if (ch->ch_digi.digi_maxchar < 1) | |
2255 | ch->ch_digi.digi_maxchar = 1; | |
2256 | ||
2257 | if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize) | |
2258 | ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize; | |
2259 | ||
2260 | if (ch->ch_digi.digi_onlen > DIGI_PLEN) | |
2261 | ch->ch_digi.digi_onlen = DIGI_PLEN; | |
2262 | ||
2263 | if (ch->ch_digi.digi_offlen > DIGI_PLEN) | |
2264 | ch->ch_digi.digi_offlen = DIGI_PLEN; | |
2265 | ||
2266 | ch->ch_bd->bd_ops->param(tty); | |
2267 | ||
a44b508a | 2268 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2269 | |
8f90ef80 | 2270 | return 0; |
0b99d589 LL |
2271 | } |
2272 | ||
0b99d589 LL |
2273 | /* |
2274 | * dgnc_set_termios() | |
2275 | */ | |
851f306d CM |
2276 | static void dgnc_tty_set_termios(struct tty_struct *tty, |
2277 | struct ktermios *old_termios) | |
0b99d589 | 2278 | { |
03425f55 | 2279 | struct dgnc_board *bd; |
0b99d589 LL |
2280 | struct channel_t *ch; |
2281 | struct un_t *un; | |
a44b508a | 2282 | unsigned long flags; |
0b99d589 LL |
2283 | |
2284 | if (!tty || tty->magic != TTY_MAGIC) | |
2285 | return; | |
2286 | ||
2287 | un = tty->driver_data; | |
2288 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2289 | return; | |
2290 | ||
2291 | ch = un->un_ch; | |
2292 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2293 | return; | |
2294 | ||
2295 | bd = ch->ch_bd; | |
2296 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2297 | return; | |
2298 | ||
a44b508a | 2299 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2300 | |
22e3de76 LL |
2301 | ch->ch_c_cflag = tty->termios.c_cflag; |
2302 | ch->ch_c_iflag = tty->termios.c_iflag; | |
2303 | ch->ch_c_oflag = tty->termios.c_oflag; | |
2304 | ch->ch_c_lflag = tty->termios.c_lflag; | |
2305 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
2306 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
2307 | |
2308 | ch->ch_bd->bd_ops->param(tty); | |
2309 | dgnc_carrier(ch); | |
2310 | ||
a44b508a | 2311 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2312 | } |
2313 | ||
0b99d589 LL |
2314 | static void dgnc_tty_throttle(struct tty_struct *tty) |
2315 | { | |
2316 | struct channel_t *ch; | |
2317 | struct un_t *un; | |
a44b508a | 2318 | unsigned long flags; |
0b99d589 LL |
2319 | |
2320 | if (!tty || tty->magic != TTY_MAGIC) | |
2321 | return; | |
2322 | ||
2323 | un = tty->driver_data; | |
2324 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2325 | return; | |
8b07d521 | 2326 | |
90d2a471 LL |
2327 | ch = un->un_ch; |
2328 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2329 | return; | |
0b99d589 | 2330 | |
a44b508a | 2331 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2332 | |
2333 | ch->ch_flags |= (CH_FORCED_STOPI); | |
2334 | ||
a44b508a | 2335 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2336 | } |
2337 | ||
0b99d589 LL |
2338 | static void dgnc_tty_unthrottle(struct tty_struct *tty) |
2339 | { | |
2340 | struct channel_t *ch; | |
2341 | struct un_t *un; | |
a44b508a | 2342 | unsigned long flags; |
0b99d589 LL |
2343 | |
2344 | if (!tty || tty->magic != TTY_MAGIC) | |
2345 | return; | |
2346 | ||
2347 | un = tty->driver_data; | |
2348 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2349 | return; | |
8b07d521 | 2350 | |
90d2a471 LL |
2351 | ch = un->un_ch; |
2352 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2353 | return; | |
0b99d589 | 2354 | |
a44b508a | 2355 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2356 | |
2357 | ch->ch_flags &= ~(CH_FORCED_STOPI); | |
2358 | ||
a44b508a | 2359 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2360 | } |
2361 | ||
0b99d589 LL |
2362 | static void dgnc_tty_start(struct tty_struct *tty) |
2363 | { | |
03425f55 | 2364 | struct dgnc_board *bd; |
0b99d589 LL |
2365 | struct channel_t *ch; |
2366 | struct un_t *un; | |
a44b508a | 2367 | unsigned long flags; |
0b99d589 LL |
2368 | |
2369 | if (!tty || tty->magic != TTY_MAGIC) | |
2370 | return; | |
2371 | ||
2372 | un = tty->driver_data; | |
2373 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2374 | return; | |
8b07d521 | 2375 | |
90d2a471 LL |
2376 | ch = un->un_ch; |
2377 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2378 | return; | |
0b99d589 LL |
2379 | |
2380 | bd = ch->ch_bd; | |
2381 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2382 | return; | |
2383 | ||
a44b508a | 2384 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2385 | |
2386 | ch->ch_flags &= ~(CH_FORCED_STOP); | |
2387 | ||
a44b508a | 2388 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2389 | } |
2390 | ||
0b99d589 LL |
2391 | static void dgnc_tty_stop(struct tty_struct *tty) |
2392 | { | |
03425f55 | 2393 | struct dgnc_board *bd; |
0b99d589 LL |
2394 | struct channel_t *ch; |
2395 | struct un_t *un; | |
a44b508a | 2396 | unsigned long flags; |
0b99d589 LL |
2397 | |
2398 | if (!tty || tty->magic != TTY_MAGIC) | |
2399 | return; | |
2400 | ||
2401 | un = tty->driver_data; | |
2402 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2403 | return; | |
8b07d521 | 2404 | |
90d2a471 LL |
2405 | ch = un->un_ch; |
2406 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2407 | return; | |
0b99d589 LL |
2408 | |
2409 | bd = ch->ch_bd; | |
2410 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2411 | return; | |
2412 | ||
a44b508a | 2413 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2414 | |
2415 | ch->ch_flags |= (CH_FORCED_STOP); | |
2416 | ||
a44b508a | 2417 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2418 | } |
2419 | ||
8b07d521 | 2420 | /* |
0b99d589 LL |
2421 | * dgnc_tty_flush_chars() |
2422 | * | |
2423 | * Flush the cook buffer | |
2424 | * | |
2425 | * Note to self, and any other poor souls who venture here: | |
2426 | * | |
2427 | * flush in this case DOES NOT mean dispose of the data. | |
2428 | * instead, it means "stop buffering and send it if you | |
2429 | * haven't already." Just guess how I figured that out... SRW 2-Jun-98 | |
2430 | * | |
2431 | * It is also always called in interrupt context - JAR 8-Sept-99 | |
2432 | */ | |
2433 | static void dgnc_tty_flush_chars(struct tty_struct *tty) | |
2434 | { | |
03425f55 | 2435 | struct dgnc_board *bd; |
0b99d589 LL |
2436 | struct channel_t *ch; |
2437 | struct un_t *un; | |
a44b508a | 2438 | unsigned long flags; |
0b99d589 LL |
2439 | |
2440 | if (!tty || tty->magic != TTY_MAGIC) | |
2441 | return; | |
2442 | ||
2443 | un = tty->driver_data; | |
2444 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2445 | return; | |
8b07d521 | 2446 | |
90d2a471 LL |
2447 | ch = un->un_ch; |
2448 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2449 | return; | |
0b99d589 LL |
2450 | |
2451 | bd = ch->ch_bd; | |
2452 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2453 | return; | |
2454 | ||
a44b508a | 2455 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2456 | |
2457 | /* Do something maybe here */ | |
2458 | ||
a44b508a | 2459 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2460 | } |
2461 | ||
0b99d589 LL |
2462 | /* |
2463 | * dgnc_tty_flush_buffer() | |
8b07d521 | 2464 | * |
0b99d589 LL |
2465 | * Flush Tx buffer (make in == out) |
2466 | */ | |
2467 | static void dgnc_tty_flush_buffer(struct tty_struct *tty) | |
2468 | { | |
2469 | struct channel_t *ch; | |
2470 | struct un_t *un; | |
a44b508a | 2471 | unsigned long flags; |
0b99d589 LL |
2472 | |
2473 | if (!tty || tty->magic != TTY_MAGIC) | |
2474 | return; | |
2475 | ||
2476 | un = tty->driver_data; | |
2477 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2478 | return; | |
8b07d521 | 2479 | |
90d2a471 LL |
2480 | ch = un->un_ch; |
2481 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2482 | return; | |
0b99d589 | 2483 | |
a44b508a | 2484 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2485 | |
2486 | ch->ch_flags &= ~CH_STOP; | |
2487 | ||
2488 | /* Flush our write queue */ | |
2489 | ch->ch_w_head = ch->ch_w_tail; | |
2490 | ||
2491 | /* Flush UARTs transmit FIFO */ | |
2492 | ch->ch_bd->bd_ops->flush_uart_write(ch); | |
2493 | ||
adcb56f9 RS |
2494 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
2495 | ch->ch_tun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2496 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2497 | } | |
adcb56f9 RS |
2498 | if (ch->ch_pun.un_flags & (UN_LOW | UN_EMPTY)) { |
2499 | ch->ch_pun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2500 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2501 | } | |
2502 | ||
a44b508a | 2503 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2504 | } |
2505 | ||
0b99d589 LL |
2506 | /***************************************************************************** |
2507 | * | |
2508 | * The IOCTL function and all of its helpers | |
2509 | * | |
2510 | *****************************************************************************/ | |
8b07d521 | 2511 | |
0b99d589 LL |
2512 | /* |
2513 | * dgnc_tty_ioctl() | |
2514 | * | |
2515 | * The usual assortment of ioctl's | |
2516 | */ | |
a31cefa2 | 2517 | static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
e352d3f1 | 2518 | unsigned long arg) |
0b99d589 | 2519 | { |
03425f55 | 2520 | struct dgnc_board *bd; |
8670a56f | 2521 | struct board_ops *ch_bd_ops; |
0b99d589 LL |
2522 | struct channel_t *ch; |
2523 | struct un_t *un; | |
2524 | int rc; | |
a44b508a | 2525 | unsigned long flags; |
6f418259 | 2526 | void __user *uarg = (void __user *)arg; |
0b99d589 LL |
2527 | |
2528 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2529 | return -ENODEV; |
0b99d589 LL |
2530 | |
2531 | un = tty->driver_data; | |
2532 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2533 | return -ENODEV; |
0b99d589 LL |
2534 | |
2535 | ch = un->un_ch; | |
2536 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2537 | return -ENODEV; |
0b99d589 LL |
2538 | |
2539 | bd = ch->ch_bd; | |
2540 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2541 | return -ENODEV; |
0b99d589 | 2542 | |
8670a56f DY |
2543 | ch_bd_ops = bd->bd_ops; |
2544 | ||
a44b508a | 2545 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2546 | |
2547 | if (un->un_open_count <= 0) { | |
a44b508a | 2548 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2549 | return -EIO; |
0b99d589 LL |
2550 | } |
2551 | ||
2552 | switch (cmd) { | |
0b99d589 LL |
2553 | /* Here are all the standard ioctl's that we MUST implement */ |
2554 | ||
2555 | case TCSBRK: | |
2556 | /* | |
8b07d521 | 2557 | * TCSBRK is SVID version: non-zero arg --> no break |
0b99d589 LL |
2558 | * this behaviour is exploited by tcdrain(). |
2559 | * | |
2560 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be | |
2561 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2562 | * in the middle: 0.375 seconds. | |
2563 | */ | |
2564 | rc = tty_check_change(tty); | |
a44b508a | 2565 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2566 | if (rc) |
8f90ef80 | 2567 | return rc; |
0b99d589 | 2568 | |
8670a56f | 2569 | rc = ch_bd_ops->drain(tty, 0); |
0b99d589 | 2570 | |
f1e51745 | 2571 | if (rc) |
8f90ef80 | 2572 | return -EINTR; |
0b99d589 | 2573 | |
a44b508a | 2574 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2575 | |
3c4019d3 | 2576 | if (((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP)) |
8670a56f | 2577 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2578 | |
a44b508a | 2579 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2580 | |
8f90ef80 | 2581 | return 0; |
0b99d589 | 2582 | |
0b99d589 | 2583 | case TCSBRKP: |
90d2a471 | 2584 | /* support for POSIX tcsendbreak() |
0b99d589 LL |
2585 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be |
2586 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2587 | * in the middle: 0.375 seconds. | |
2588 | */ | |
2589 | rc = tty_check_change(tty); | |
a44b508a | 2590 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2591 | if (rc) |
8f90ef80 | 2592 | return rc; |
0b99d589 | 2593 | |
8670a56f | 2594 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2595 | if (rc) |
8f90ef80 | 2596 | return -EINTR; |
0b99d589 | 2597 | |
a44b508a | 2598 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2599 | |
8670a56f | 2600 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2601 | |
a44b508a | 2602 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2603 | |
8f90ef80 | 2604 | return 0; |
0b99d589 LL |
2605 | |
2606 | case TIOCSBRK: | |
2607 | rc = tty_check_change(tty); | |
a44b508a | 2608 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2609 | if (rc) |
8f90ef80 | 2610 | return rc; |
0b99d589 | 2611 | |
8670a56f | 2612 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2613 | if (rc) |
8f90ef80 | 2614 | return -EINTR; |
0b99d589 | 2615 | |
a44b508a | 2616 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2617 | |
8670a56f | 2618 | ch_bd_ops->send_break(ch, 250); |
0b99d589 | 2619 | |
a44b508a | 2620 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2621 | |
8f90ef80 | 2622 | return 0; |
0b99d589 LL |
2623 | |
2624 | case TIOCCBRK: | |
2625 | /* Do Nothing */ | |
a44b508a | 2626 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2627 | return 0; |
2628 | ||
2629 | case TIOCGSOFTCAR: | |
2630 | ||
a44b508a | 2631 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2632 | |
851f306d | 2633 | rc = put_user(C_CLOCAL(tty) ? 1 : 0, |
6f418259 | 2634 | (unsigned long __user *)arg); |
8f90ef80 | 2635 | return rc; |
0b99d589 LL |
2636 | |
2637 | case TIOCSSOFTCAR: | |
2638 | ||
a44b508a | 2639 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2640 | rc = get_user(arg, (unsigned long __user *)arg); |
0b99d589 | 2641 | if (rc) |
8f90ef80 | 2642 | return rc; |
0b99d589 | 2643 | |
a44b508a | 2644 | spin_lock_irqsave(&ch->ch_lock, flags); |
851f306d CM |
2645 | tty->termios.c_cflag = ((tty->termios.c_cflag & ~CLOCAL) | |
2646 | (arg ? CLOCAL : 0)); | |
8670a56f | 2647 | ch_bd_ops->param(tty); |
a44b508a | 2648 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2649 | |
8f90ef80 | 2650 | return 0; |
8b07d521 | 2651 | |
0b99d589 | 2652 | case TIOCMGET: |
a44b508a | 2653 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2654 | return dgnc_get_modem_info(ch, uarg); |
0b99d589 LL |
2655 | |
2656 | case TIOCMBIS: | |
2657 | case TIOCMBIC: | |
2658 | case TIOCMSET: | |
a44b508a | 2659 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2660 | return dgnc_set_modem_info(tty, cmd, uarg); |
0b99d589 LL |
2661 | |
2662 | /* | |
2663 | * Here are any additional ioctl's that we want to implement | |
2664 | */ | |
8b07d521 LL |
2665 | |
2666 | case TCFLSH: | |
0b99d589 LL |
2667 | /* |
2668 | * The linux tty driver doesn't have a flush | |
2669 | * input routine for the driver, assuming all backed | |
2670 | * up data is in the line disc. buffers. However, | |
2671 | * we all know that's not the case. Here, we | |
2672 | * act on the ioctl, but then lie and say we didn't | |
2673 | * so the line discipline will process the flush | |
2674 | * also. | |
8b07d521 | 2675 | */ |
0b99d589 LL |
2676 | rc = tty_check_change(tty); |
2677 | if (rc) { | |
a44b508a | 2678 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2679 | return rc; |
0b99d589 LL |
2680 | } |
2681 | ||
2682 | if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) { | |
2683 | ch->ch_r_head = ch->ch_r_tail; | |
8670a56f | 2684 | ch_bd_ops->flush_uart_read(ch); |
0b99d589 LL |
2685 | /* Force queue flow control to be released, if needed */ |
2686 | dgnc_check_queue_flow_control(ch); | |
2687 | } | |
2688 | ||
2689 | if ((arg == TCOFLUSH) || (arg == TCIOFLUSH)) { | |
2690 | if (!(un->un_type == DGNC_PRINT)) { | |
2691 | ch->ch_w_head = ch->ch_w_tail; | |
8670a56f | 2692 | ch_bd_ops->flush_uart_write(ch); |
0b99d589 | 2693 | |
24039c58 | 2694 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
851f306d | 2695 | ch->ch_tun.un_flags &= |
adcb56f9 | 2696 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2697 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2698 | } | |
2699 | ||
2700 | if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) { | |
851f306d | 2701 | ch->ch_pun.un_flags &= |
adcb56f9 | 2702 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2703 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2704 | } | |
0b99d589 LL |
2705 | } |
2706 | } | |
2707 | ||
8b07d521 | 2708 | /* pretend we didn't recognize this IOCTL */ |
a44b508a | 2709 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2710 | return -ENOIOCTLCMD; |
0b99d589 LL |
2711 | case TCSETSF: |
2712 | case TCSETSW: | |
2713 | /* | |
2714 | * The linux tty driver doesn't have a flush | |
2715 | * input routine for the driver, assuming all backed | |
2716 | * up data is in the line disc. buffers. However, | |
2717 | * we all know that's not the case. Here, we | |
2718 | * act on the ioctl, but then lie and say we didn't | |
2719 | * so the line discipline will process the flush | |
2720 | * also. | |
2721 | */ | |
2722 | if (cmd == TCSETSF) { | |
2723 | /* flush rx */ | |
2724 | ch->ch_flags &= ~CH_STOP; | |
2725 | ch->ch_r_head = ch->ch_r_tail; | |
8670a56f | 2726 | ch_bd_ops->flush_uart_read(ch); |
0b99d589 LL |
2727 | /* Force queue flow control to be released, if needed */ |
2728 | dgnc_check_queue_flow_control(ch); | |
2729 | } | |
2730 | ||
2731 | /* now wait for all the output to drain */ | |
a44b508a | 2732 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2733 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2734 | if (rc) |
8f90ef80 | 2735 | return -EINTR; |
0b99d589 LL |
2736 | |
2737 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2738 | return -ENOIOCTLCMD; |
0b99d589 LL |
2739 | |
2740 | case TCSETAW: | |
2741 | ||
a44b508a | 2742 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2743 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 | 2744 | if (rc) |
8f90ef80 | 2745 | return -EINTR; |
0b99d589 LL |
2746 | |
2747 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2748 | return -ENOIOCTLCMD; |
0b99d589 LL |
2749 | |
2750 | case TCXONC: | |
a44b508a | 2751 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2752 | /* Make the ld do it */ |
8f90ef80 | 2753 | return -ENOIOCTLCMD; |
0b99d589 LL |
2754 | |
2755 | case DIGI_GETA: | |
2756 | /* get information for ditty */ | |
a44b508a | 2757 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2758 | return dgnc_tty_digigeta(tty, uarg); |
0b99d589 LL |
2759 | |
2760 | case DIGI_SETAW: | |
2761 | case DIGI_SETAF: | |
2762 | ||
2763 | /* set information for ditty */ | |
2764 | if (cmd == (DIGI_SETAW)) { | |
a44b508a | 2765 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8670a56f | 2766 | rc = ch_bd_ops->drain(tty, 0); |
f1e51745 SL |
2767 | |
2768 | if (rc) | |
8f90ef80 | 2769 | return -EINTR; |
f1e51745 | 2770 | |
a44b508a | 2771 | spin_lock_irqsave(&ch->ch_lock, flags); |
2000c581 | 2772 | } else { |
0b99d589 LL |
2773 | tty_ldisc_flush(tty); |
2774 | } | |
2775 | /* fall thru */ | |
2776 | ||
2777 | case DIGI_SETA: | |
a44b508a | 2778 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2779 | return dgnc_tty_digiseta(tty, uarg); |
8b07d521 | 2780 | |
0b99d589 LL |
2781 | case DIGI_LOOPBACK: |
2782 | { | |
2783 | uint loopback = 0; | |
851f306d CM |
2784 | /* Let go of locks when accessing user space, |
2785 | * could sleep | |
2786 | */ | |
a44b508a | 2787 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2788 | rc = get_user(loopback, (unsigned int __user *)arg); |
0b99d589 | 2789 | if (rc) |
8f90ef80 | 2790 | return rc; |
a44b508a | 2791 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2792 | |
8b07d521 | 2793 | /* Enable/disable internal loopback for this port */ |
0b99d589 LL |
2794 | if (loopback) |
2795 | ch->ch_flags |= CH_LOOPBACK; | |
2796 | else | |
2797 | ch->ch_flags &= ~(CH_LOOPBACK); | |
2798 | ||
8670a56f | 2799 | ch_bd_ops->param(tty); |
a44b508a | 2800 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2801 | return 0; |
90d2a471 | 2802 | } |
0b99d589 LL |
2803 | |
2804 | case DIGI_GETCUSTOMBAUD: | |
a44b508a | 2805 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2806 | rc = put_user(ch->ch_custom_speed, (unsigned int __user *)arg); |
8f90ef80 | 2807 | return rc; |
0b99d589 LL |
2808 | |
2809 | case DIGI_SETCUSTOMBAUD: | |
2810 | { | |
93c76c9c | 2811 | int new_rate; |
0b99d589 | 2812 | /* Let go of locks when accessing user space, could sleep */ |
a44b508a | 2813 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2814 | rc = get_user(new_rate, (int __user *)arg); |
0b99d589 | 2815 | if (rc) |
8f90ef80 | 2816 | return rc; |
a44b508a | 2817 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2818 | dgnc_set_custom_speed(ch, new_rate); |
8670a56f | 2819 | ch_bd_ops->param(tty); |
a44b508a | 2820 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2821 | return 0; |
90d2a471 | 2822 | } |
0b99d589 LL |
2823 | |
2824 | /* | |
2825 | * This ioctl allows insertion of a character into the front | |
2826 | * of any pending data to be transmitted. | |
2827 | * | |
2828 | * This ioctl is to satify the "Send Character Immediate" | |
2829 | * call that the RealPort protocol spec requires. | |
2830 | */ | |
2831 | case DIGI_REALPORT_SENDIMMEDIATE: | |
2832 | { | |
2833 | unsigned char c; | |
0eaa02e6 | 2834 | |
a44b508a | 2835 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2836 | rc = get_user(c, (unsigned char __user *)arg); |
0b99d589 | 2837 | if (rc) |
8f90ef80 | 2838 | return rc; |
a44b508a | 2839 | spin_lock_irqsave(&ch->ch_lock, flags); |
8670a56f | 2840 | ch_bd_ops->send_immediate_char(ch, c); |
a44b508a | 2841 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2842 | return 0; |
0b99d589 LL |
2843 | } |
2844 | ||
2845 | /* | |
2846 | * This ioctl returns all the current counts for the port. | |
2847 | * | |
2848 | * This ioctl is to satify the "Line Error Counters" | |
2849 | * call that the RealPort protocol spec requires. | |
2850 | */ | |
2851 | case DIGI_REALPORT_GETCOUNTERS: | |
2852 | { | |
2853 | struct digi_getcounter buf; | |
2854 | ||
2855 | buf.norun = ch->ch_err_overrun; | |
feba47a7 | 2856 | buf.noflow = 0; /* The driver doesn't keep this stat */ |
0b99d589 LL |
2857 | buf.nframe = ch->ch_err_frame; |
2858 | buf.nparity = ch->ch_err_parity; | |
2859 | buf.nbreak = ch->ch_err_break; | |
2860 | buf.rbytes = ch->ch_rxcount; | |
2861 | buf.tbytes = ch->ch_txcount; | |
2862 | ||
a44b508a | 2863 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2864 | |
50667c67 | 2865 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2866 | return -EFAULT; |
50667c67 | 2867 | |
8f90ef80 | 2868 | return 0; |
0b99d589 LL |
2869 | } |
2870 | ||
2871 | /* | |
2872 | * This ioctl returns all current events. | |
2873 | * | |
2874 | * This ioctl is to satify the "Event Reporting" | |
2875 | * call that the RealPort protocol spec requires. | |
90d2a471 | 2876 | */ |
0b99d589 LL |
2877 | case DIGI_REALPORT_GETEVENTS: |
2878 | { | |
2879 | unsigned int events = 0; | |
2880 | ||
2881 | /* NOTE: MORE EVENTS NEEDS TO BE ADDED HERE */ | |
2882 | if (ch->ch_flags & CH_BREAK_SENDING) | |
2883 | events |= EV_TXB; | |
851f306d CM |
2884 | if ((ch->ch_flags & CH_STOP) || |
2885 | (ch->ch_flags & CH_FORCED_STOP)) | |
0b99d589 | 2886 | events |= (EV_OPU | EV_OPS); |
50667c67 | 2887 | |
851f306d CM |
2888 | if ((ch->ch_flags & CH_STOPI) || |
2889 | (ch->ch_flags & CH_FORCED_STOPI)) | |
0b99d589 | 2890 | events |= (EV_IPU | EV_IPS); |
0b99d589 | 2891 | |
a44b508a | 2892 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2893 | rc = put_user(events, (unsigned int __user *)arg); |
8f90ef80 | 2894 | return rc; |
0b99d589 LL |
2895 | } |
2896 | ||
2897 | /* | |
2898 | * This ioctl returns TOUT and TIN counters based | |
2899 | * upon the values passed in by the RealPort Server. | |
2900 | * It also passes back whether the UART Transmitter is | |
2901 | * empty as well. | |
90d2a471 | 2902 | */ |
0b99d589 LL |
2903 | case DIGI_REALPORT_GETBUFFERS: |
2904 | { | |
2905 | struct digi_getbuffer buf; | |
2906 | int tdist; | |
2907 | int count; | |
2908 | ||
a44b508a | 2909 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2910 | |
2911 | /* | |
2912 | * Get data from user first. | |
2913 | */ | |
50667c67 | 2914 | if (copy_from_user(&buf, uarg, sizeof(buf))) |
8f90ef80 | 2915 | return -EFAULT; |
0b99d589 | 2916 | |
a44b508a | 2917 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2918 | |
2919 | /* | |
2920 | * Figure out how much data is in our RX and TX queues. | |
2921 | */ | |
2922 | buf.rxbuf = (ch->ch_r_head - ch->ch_r_tail) & RQUEUEMASK; | |
2923 | buf.txbuf = (ch->ch_w_head - ch->ch_w_tail) & WQUEUEMASK; | |
2924 | ||
2925 | /* | |
2926 | * Is the UART empty? Add that value to whats in our TX queue. | |
2927 | */ | |
8670a56f | 2928 | count = buf.txbuf + ch_bd_ops->get_uart_bytes_left(ch); |
0b99d589 LL |
2929 | |
2930 | /* | |
2931 | * Figure out how much data the RealPort Server believes should | |
2932 | * be in our TX queue. | |
2933 | */ | |
b9f84637 | 2934 | tdist = (buf.tx_in - buf.tx_out) & 0xffff; |
0b99d589 LL |
2935 | |
2936 | /* | |
2937 | * If we have more data than the RealPort Server believes we | |
2938 | * should have, reduce our count to its amount. | |
2939 | * | |
2940 | * This count difference CAN happen because the Linux LD can | |
2941 | * insert more characters into our queue for OPOST processing | |
2942 | * that the RealPort Server doesn't know about. | |
2943 | */ | |
50667c67 | 2944 | if (buf.txbuf > tdist) |
0b99d589 | 2945 | buf.txbuf = tdist; |
0b99d589 LL |
2946 | |
2947 | /* | |
2948 | * Report whether our queue and UART TX are completely empty. | |
2949 | */ | |
50667c67 | 2950 | if (count) |
0b99d589 | 2951 | buf.txdone = 0; |
50667c67 | 2952 | else |
0b99d589 | 2953 | buf.txdone = 1; |
0b99d589 | 2954 | |
a44b508a | 2955 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2956 | |
50667c67 | 2957 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2958 | return -EFAULT; |
50667c67 | 2959 | |
8f90ef80 | 2960 | return 0; |
0b99d589 LL |
2961 | } |
2962 | default: | |
a44b508a | 2963 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2964 | |
8f90ef80 | 2965 | return -ENOIOCTLCMD; |
0b99d589 | 2966 | } |
0b99d589 | 2967 | } |