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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 | ||
0b99d589 | 181 | brd->SerialDriver.magic = TTY_DRIVER_MAGIC; |
8b07d521 | 182 | |
0b99d589 LL |
183 | snprintf(brd->SerialName, MAXTTYNAMELEN, "tty_dgnc_%d_", brd->boardnum); |
184 | ||
185 | brd->SerialDriver.name = brd->SerialName; | |
186 | brd->SerialDriver.name_base = 0; | |
187 | brd->SerialDriver.major = 0; | |
188 | brd->SerialDriver.minor_start = 0; | |
189 | brd->SerialDriver.num = brd->maxports; | |
8b07d521 LL |
190 | brd->SerialDriver.type = TTY_DRIVER_TYPE_SERIAL; |
191 | brd->SerialDriver.subtype = SERIAL_TYPE_NORMAL; | |
0b99d589 LL |
192 | brd->SerialDriver.init_termios = DgncDefaultTermios; |
193 | brd->SerialDriver.driver_name = DRVSTR; | |
851f306d CM |
194 | brd->SerialDriver.flags = (TTY_DRIVER_REAL_RAW | |
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 | */ |
851f306d CM |
202 | brd->SerialDriver.ttys = kcalloc(brd->maxports, |
203 | sizeof(*brd->SerialDriver.ttys), | |
204 | GFP_KERNEL); | |
0b99d589 | 205 | if (!brd->SerialDriver.ttys) |
8f90ef80 | 206 | return -ENOMEM; |
0b99d589 | 207 | |
90d2a471 | 208 | kref_init(&brd->SerialDriver.kref); |
851f306d CM |
209 | brd->SerialDriver.termios = kcalloc(brd->maxports, |
210 | sizeof(*brd->SerialDriver.termios), | |
211 | GFP_KERNEL); | |
0b99d589 | 212 | if (!brd->SerialDriver.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 | */ | |
219 | tty_set_operations(&brd->SerialDriver, &dgnc_tty_ops); | |
220 | ||
221 | if (!brd->dgnc_Major_Serial_Registered) { | |
222 | /* Register tty devices */ | |
223 | rc = tty_register_driver(&brd->SerialDriver); | |
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 | } |
d533a524 | 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 | */ | |
237 | brd->PrintDriver.magic = TTY_DRIVER_MAGIC; | |
238 | snprintf(brd->PrintName, MAXTTYNAMELEN, "pr_dgnc_%d_", brd->boardnum); | |
239 | ||
240 | brd->PrintDriver.name = brd->PrintName; | |
241 | brd->PrintDriver.name_base = 0; | |
242 | brd->PrintDriver.major = brd->SerialDriver.major; | |
243 | brd->PrintDriver.minor_start = 0x80; | |
244 | brd->PrintDriver.num = brd->maxports; | |
8b07d521 | 245 | brd->PrintDriver.type = TTY_DRIVER_TYPE_SERIAL; |
0b99d589 LL |
246 | brd->PrintDriver.subtype = SERIAL_TYPE_NORMAL; |
247 | brd->PrintDriver.init_termios = DgncDefaultTermios; | |
248 | brd->PrintDriver.driver_name = DRVSTR; | |
851f306d CM |
249 | brd->PrintDriver.flags = (TTY_DRIVER_REAL_RAW | |
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 | */ | |
851f306d CM |
258 | brd->PrintDriver.ttys = kcalloc(brd->maxports, |
259 | sizeof(*brd->PrintDriver.ttys), | |
260 | GFP_KERNEL); | |
0b99d589 | 261 | if (!brd->PrintDriver.ttys) |
8f90ef80 | 262 | return -ENOMEM; |
90d2a471 | 263 | kref_init(&brd->PrintDriver.kref); |
851f306d CM |
264 | brd->PrintDriver.termios = kcalloc(brd->maxports, |
265 | sizeof(*brd->PrintDriver.termios), | |
266 | GFP_KERNEL); | |
0b99d589 | 267 | if (!brd->PrintDriver.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 | */ | |
274 | tty_set_operations(&brd->PrintDriver, &dgnc_tty_ops); | |
275 | ||
276 | if (!brd->dgnc_Major_TransparentPrint_Registered) { | |
277 | /* Register Transparent Print devices */ | |
90d2a471 | 278 | rc = tty_register_driver(&brd->PrintDriver); |
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 | } |
d533a524 | 285 | brd->dgnc_Major_TransparentPrint_Registered = true; |
0b99d589 LL |
286 | } |
287 | ||
288 | dgnc_BoardsByMajor[brd->SerialDriver.major] = brd; | |
289 | brd->dgnc_Serial_Major = brd->SerialDriver.major; | |
290 | brd->dgnc_TransparentPrint_Major = brd->PrintDriver.major; | |
291 | ||
8f90ef80 | 292 | return rc; |
0b99d589 LL |
293 | } |
294 | ||
0b99d589 LL |
295 | /* |
296 | * dgnc_tty_init() | |
297 | * | |
298 | * Init the tty subsystem. Called once per board after board has been | |
299 | * downloaded and init'ed. | |
300 | */ | |
03425f55 | 301 | int dgnc_tty_init(struct dgnc_board *brd) |
0b99d589 LL |
302 | { |
303 | int i; | |
a7a75386 | 304 | void __iomem *vaddr; |
0b99d589 LL |
305 | struct channel_t *ch; |
306 | ||
307 | if (!brd) | |
8f90ef80 | 308 | return -ENXIO; |
0b99d589 | 309 | |
0b99d589 LL |
310 | /* |
311 | * Initialize board structure elements. | |
312 | */ | |
313 | ||
314 | vaddr = brd->re_map_membase; | |
315 | ||
316 | brd->nasync = brd->maxports; | |
317 | ||
0b99d589 | 318 | for (i = 0; i < brd->nasync; i++) { |
fa52d96c GS |
319 | /* |
320 | * Okay to malloc with GFP_KERNEL, we are not at | |
321 | * interrupt context, and there are no locks held. | |
322 | */ | |
323 | brd->channels[i] = kzalloc(sizeof(*brd->channels[i]), | |
324 | GFP_KERNEL); | |
325 | if (!brd->channels[i]) | |
326 | goto err_free_channels; | |
0b99d589 LL |
327 | } |
328 | ||
329 | ch = brd->channels[0]; | |
330 | vaddr = brd->re_map_membase; | |
331 | ||
332 | /* Set up channel variables */ | |
333 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { | |
a44b508a | 334 | spin_lock_init(&ch->ch_lock); |
0b99d589 LL |
335 | |
336 | /* Store all our magic numbers */ | |
337 | ch->magic = DGNC_CHANNEL_MAGIC; | |
338 | ch->ch_tun.magic = DGNC_UNIT_MAGIC; | |
339 | ch->ch_tun.un_ch = ch; | |
340 | ch->ch_tun.un_type = DGNC_SERIAL; | |
341 | ch->ch_tun.un_dev = i; | |
342 | ||
343 | ch->ch_pun.magic = DGNC_UNIT_MAGIC; | |
344 | ch->ch_pun.un_ch = ch; | |
345 | ch->ch_pun.un_type = DGNC_PRINT; | |
346 | ch->ch_pun.un_dev = i + 128; | |
347 | ||
348 | if (brd->bd_uart_offset == 0x200) | |
a7a75386 | 349 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 | 350 | else |
a7a75386 | 351 | ch->ch_cls_uart = vaddr + (brd->bd_uart_offset * i); |
0b99d589 LL |
352 | |
353 | ch->ch_bd = brd; | |
354 | ch->ch_portnum = i; | |
355 | ch->ch_digi = dgnc_digi_init; | |
356 | ||
357 | /* .25 second delay */ | |
358 | ch->ch_close_delay = 250; | |
359 | ||
360 | init_waitqueue_head(&ch->ch_flags_wait); | |
361 | init_waitqueue_head(&ch->ch_tun.un_flags_wait); | |
362 | init_waitqueue_head(&ch->ch_pun.un_flags_wait); | |
0b99d589 LL |
363 | |
364 | { | |
365 | struct device *classp; | |
0eaa02e6 | 366 | |
0b99d589 | 367 | classp = tty_register_device(&brd->SerialDriver, i, |
7df227c4 | 368 | &ch->ch_bd->pdev->dev); |
0b99d589 LL |
369 | ch->ch_tun.un_sysfs = classp; |
370 | dgnc_create_tty_sysfs(&ch->ch_tun, classp); | |
371 | ||
372 | classp = tty_register_device(&brd->PrintDriver, i, | |
7df227c4 | 373 | &ch->ch_bd->pdev->dev); |
0b99d589 LL |
374 | ch->ch_pun.un_sysfs = classp; |
375 | dgnc_create_tty_sysfs(&ch->ch_pun, classp); | |
376 | } | |
0b99d589 LL |
377 | } |
378 | ||
8f90ef80 | 379 | return 0; |
fa52d96c GS |
380 | |
381 | err_free_channels: | |
382 | for (i = i - 1; i >= 0; --i) { | |
383 | kfree(brd->channels[i]); | |
384 | brd->channels[i] = NULL; | |
385 | } | |
386 | return -ENOMEM; | |
0b99d589 LL |
387 | } |
388 | ||
0b99d589 LL |
389 | /* |
390 | * dgnc_tty_post_uninit() | |
391 | * | |
392 | * UnInitialize any global tty related data. | |
393 | */ | |
394 | void dgnc_tty_post_uninit(void) | |
395 | { | |
5b4af85e DY |
396 | kfree(dgnc_TmpWriteBuf); |
397 | dgnc_TmpWriteBuf = NULL; | |
0b99d589 LL |
398 | } |
399 | ||
0b99d589 LL |
400 | /* |
401 | * dgnc_tty_uninit() | |
402 | * | |
403 | * Uninitialize the TTY portion of this driver. Free all memory and | |
8b07d521 | 404 | * resources. |
0b99d589 | 405 | */ |
03425f55 | 406 | void dgnc_tty_uninit(struct dgnc_board *brd) |
0b99d589 LL |
407 | { |
408 | int i = 0; | |
409 | ||
410 | if (brd->dgnc_Major_Serial_Registered) { | |
411 | dgnc_BoardsByMajor[brd->SerialDriver.major] = NULL; | |
412 | brd->dgnc_Serial_Major = 0; | |
413 | for (i = 0; i < brd->nasync; i++) { | |
ce2927e9 GS |
414 | if (brd->channels[i]) |
415 | dgnc_remove_tty_sysfs(brd->channels[i]-> | |
416 | ch_tun.un_sysfs); | |
0b99d589 LL |
417 | tty_unregister_device(&brd->SerialDriver, i); |
418 | } | |
419 | tty_unregister_driver(&brd->SerialDriver); | |
d533a524 | 420 | brd->dgnc_Major_Serial_Registered = false; |
0b99d589 LL |
421 | } |
422 | ||
423 | if (brd->dgnc_Major_TransparentPrint_Registered) { | |
424 | dgnc_BoardsByMajor[brd->PrintDriver.major] = NULL; | |
425 | brd->dgnc_TransparentPrint_Major = 0; | |
426 | for (i = 0; i < brd->nasync; i++) { | |
ce2927e9 GS |
427 | if (brd->channels[i]) |
428 | dgnc_remove_tty_sysfs(brd->channels[i]-> | |
429 | ch_pun.un_sysfs); | |
0b99d589 LL |
430 | tty_unregister_device(&brd->PrintDriver, i); |
431 | } | |
432 | tty_unregister_driver(&brd->PrintDriver); | |
d533a524 | 433 | brd->dgnc_Major_TransparentPrint_Registered = false; |
0b99d589 LL |
434 | } |
435 | ||
5b4af85e DY |
436 | kfree(brd->SerialDriver.ttys); |
437 | brd->SerialDriver.ttys = NULL; | |
7f5ad018 HPGE |
438 | kfree(brd->SerialDriver.termios); |
439 | brd->SerialDriver.termios = NULL; | |
5b4af85e DY |
440 | kfree(brd->PrintDriver.ttys); |
441 | brd->PrintDriver.ttys = NULL; | |
7f5ad018 HPGE |
442 | kfree(brd->PrintDriver.termios); |
443 | brd->PrintDriver.termios = NULL; | |
0b99d589 LL |
444 | } |
445 | ||
8e8d27f7 | 446 | /* |
0b99d589 LL |
447 | * dgnc_wmove - Write data to transmit queue. |
448 | * | |
449 | * ch - Pointer to channel structure. | |
f7f2b10a | 450 | * buf - Pointer to characters to be moved. |
0b99d589 | 451 | * n - Number of characters to move. |
8e8d27f7 | 452 | */ |
0b99d589 LL |
453 | static void dgnc_wmove(struct channel_t *ch, char *buf, uint n) |
454 | { | |
455 | int remain; | |
456 | uint head; | |
457 | ||
458 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
459 | return; | |
8b07d521 | 460 | |
0b99d589 LL |
461 | head = ch->ch_w_head & WQUEUEMASK; |
462 | ||
463 | /* | |
464 | * If the write wraps over the top of the circular buffer, | |
465 | * move the portion up to the wrap point, and reset the | |
466 | * pointers to the bottom. | |
467 | */ | |
468 | remain = WQUEUESIZE - head; | |
469 | ||
470 | if (n >= remain) { | |
8b07d521 | 471 | n -= remain; |
0b99d589 LL |
472 | memcpy(ch->ch_wqueue + head, buf, remain); |
473 | head = 0; | |
474 | buf += remain; | |
475 | } | |
476 | ||
477 | if (n > 0) { | |
478 | /* | |
479 | * Move rest of data. | |
480 | */ | |
481 | remain = n; | |
482 | memcpy(ch->ch_wqueue + head, buf, remain); | |
483 | head += remain; | |
484 | } | |
485 | ||
486 | head &= WQUEUEMASK; | |
487 | ch->ch_w_head = head; | |
488 | } | |
489 | ||
8e8d27f7 | 490 | /* |
0b99d589 | 491 | * dgnc_input - Process received data. |
8b07d521 | 492 | * |
90d2a471 | 493 | * ch - Pointer to channel structure. |
8e8d27f7 | 494 | */ |
0b99d589 LL |
495 | void dgnc_input(struct channel_t *ch) |
496 | { | |
03425f55 | 497 | struct dgnc_board *bd; |
0b99d589 | 498 | struct tty_struct *tp; |
c84a083b | 499 | struct tty_ldisc *ld = NULL; |
0b99d589 LL |
500 | uint rmask; |
501 | ushort head; | |
502 | ushort tail; | |
503 | int data_len; | |
a44b508a | 504 | unsigned long flags; |
0b99d589 LL |
505 | int flip_len; |
506 | int len = 0; | |
507 | int n = 0; | |
0b99d589 LL |
508 | int s = 0; |
509 | int i = 0; | |
510 | ||
511 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
512 | return; | |
513 | ||
514 | tp = ch->ch_tun.un_tty; | |
515 | ||
516 | bd = ch->ch_bd; | |
a82477c3 | 517 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
0b99d589 LL |
518 | return; |
519 | ||
a44b508a | 520 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 521 | |
8b07d521 LL |
522 | /* |
523 | * Figure the number of characters in the buffer. | |
0b99d589 LL |
524 | * Exit immediately if none. |
525 | */ | |
526 | rmask = RQUEUEMASK; | |
527 | head = ch->ch_r_head & rmask; | |
528 | tail = ch->ch_r_tail & rmask; | |
529 | data_len = (head - tail) & rmask; | |
530 | ||
c84a083b QL |
531 | if (data_len == 0) |
532 | goto exit_unlock; | |
0b99d589 | 533 | |
0b99d589 LL |
534 | /* |
535 | * If the device is not open, or CREAD is off, | |
90d2a471 | 536 | * flush input data and return immediately. |
0b99d589 | 537 | */ |
851f306d CM |
538 | if (!tp || (tp->magic != TTY_MAGIC) || |
539 | !(ch->ch_tun.un_flags & UN_ISOPEN) || | |
9db276f8 | 540 | !C_CREAD(tp) || |
851f306d | 541 | (ch->ch_tun.un_flags & UN_CLOSING)) { |
0b99d589 LL |
542 | ch->ch_r_head = tail; |
543 | ||
544 | /* Force queue flow control to be released, if needed */ | |
545 | dgnc_check_queue_flow_control(ch); | |
546 | ||
c84a083b | 547 | goto exit_unlock; |
0b99d589 LL |
548 | } |
549 | ||
550 | /* | |
551 | * If we are throttled, simply don't read any data. | |
552 | */ | |
c84a083b QL |
553 | if (ch->ch_flags & CH_FORCED_STOPI) |
554 | goto exit_unlock; | |
0b99d589 | 555 | |
100013fa | 556 | flip_len = TTY_FLIPBUF_SIZE; |
0b99d589 LL |
557 | |
558 | /* Chop down the length, if needed */ | |
559 | len = min(data_len, flip_len); | |
100013fa | 560 | len = min(len, (N_TTY_BUF_SIZE - 1)); |
0b99d589 LL |
561 | |
562 | ld = tty_ldisc_ref(tp); | |
563 | ||
0b99d589 LL |
564 | /* |
565 | * If we were unable to get a reference to the ld, | |
566 | * don't flush our buffer, and act like the ld doesn't | |
567 | * have any space to put the data right now. | |
568 | */ | |
569 | if (!ld) { | |
570 | len = 0; | |
571 | } else { | |
572 | /* | |
573 | * If ld doesn't have a pointer to a receive_buf function, | |
574 | * flush the data, then act like the ld doesn't have any | |
575 | * space to put the data right now. | |
576 | */ | |
577 | if (!ld->ops->receive_buf) { | |
578 | ch->ch_r_head = ch->ch_r_tail; | |
579 | len = 0; | |
8b07d521 | 580 | } |
0b99d589 LL |
581 | } |
582 | ||
c84a083b QL |
583 | if (len <= 0) |
584 | goto exit_unlock; | |
0b99d589 LL |
585 | |
586 | /* | |
587 | * The tty layer in the kernel has changed in 2.6.16+. | |
588 | * | |
589 | * The flip buffers in the tty structure are no longer exposed, | |
590 | * and probably will be going away eventually. | |
8b07d521 | 591 | * |
0b99d589 LL |
592 | * If we are completely raw, we don't need to go through a lot |
593 | * of the tty layers that exist. | |
594 | * In this case, we take the shortest and fastest route we | |
595 | * can to relay the data to the user. | |
596 | * | |
597 | * On the other hand, if we are not raw, we need to go through | |
598 | * the new 2.6.16+ tty layer, which has its API more well defined. | |
599 | */ | |
100013fa LL |
600 | len = tty_buffer_request_room(tp->port, len); |
601 | n = len; | |
0b99d589 | 602 | |
100013fa LL |
603 | /* |
604 | * n now contains the most amount of data we can copy, | |
605 | * bounded either by how much the Linux tty layer can handle, | |
606 | * or the amount of data the card actually has pending... | |
607 | */ | |
608 | while (n) { | |
609 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; | |
610 | s = min(s, n); | |
0b99d589 | 611 | |
100013fa LL |
612 | if (s <= 0) |
613 | break; | |
0b99d589 LL |
614 | |
615 | /* | |
8b07d521 | 616 | * If conditions are such that ld needs to see all |
100013fa LL |
617 | * UART errors, we will have to walk each character |
618 | * and error byte and send them to the buffer one at | |
619 | * a time. | |
0b99d589 | 620 | */ |
100013fa LL |
621 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
622 | for (i = 0; i < s; i++) { | |
623 | if (*(ch->ch_equeue + tail + i) & UART_LSR_BI) | |
851f306d CM |
624 | tty_insert_flip_char(tp->port, |
625 | *(ch->ch_rqueue + tail + i), | |
626 | TTY_BREAK); | |
627 | else if (*(ch->ch_equeue + tail + i) & | |
628 | UART_LSR_PE) | |
629 | tty_insert_flip_char(tp->port, | |
630 | *(ch->ch_rqueue + tail + i), | |
631 | TTY_PARITY); | |
632 | else if (*(ch->ch_equeue + tail + i) & | |
633 | UART_LSR_FE) | |
634 | tty_insert_flip_char(tp->port, | |
635 | *(ch->ch_rqueue + tail + i), | |
636 | TTY_FRAME); | |
100013fa | 637 | else |
851f306d CM |
638 | tty_insert_flip_char(tp->port, |
639 | *(ch->ch_rqueue + tail + i), | |
640 | TTY_NORMAL); | |
100013fa | 641 | } |
2000c581 | 642 | } else { |
851f306d CM |
643 | tty_insert_flip_string(tp->port, |
644 | ch->ch_rqueue + tail, | |
645 | s); | |
0b99d589 LL |
646 | } |
647 | ||
100013fa LL |
648 | tail += s; |
649 | n -= s; | |
650 | /* Flip queue if needed */ | |
651 | tail &= rmask; | |
0b99d589 | 652 | } |
0b99d589 | 653 | |
100013fa LL |
654 | ch->ch_r_tail = tail & rmask; |
655 | ch->ch_e_tail = tail & rmask; | |
656 | dgnc_check_queue_flow_control(ch); | |
a44b508a | 657 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 658 | |
100013fa LL |
659 | /* Tell the tty layer its okay to "eat" the data now */ |
660 | tty_flip_buffer_push(tp->port); | |
0b99d589 LL |
661 | |
662 | if (ld) | |
663 | tty_ldisc_deref(ld); | |
c84a083b QL |
664 | return; |
665 | ||
666 | exit_unlock: | |
5ec29365 | 667 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
c84a083b QL |
668 | if (ld) |
669 | tty_ldisc_deref(ld); | |
0b99d589 LL |
670 | } |
671 | ||
8b07d521 | 672 | /************************************************************************ |
0b99d589 | 673 | * Determines when CARRIER changes state and takes appropriate |
8b07d521 | 674 | * action. |
0b99d589 LL |
675 | ************************************************************************/ |
676 | void dgnc_carrier(struct channel_t *ch) | |
677 | { | |
03425f55 | 678 | struct dgnc_board *bd; |
0b99d589 | 679 | |
90d2a471 LL |
680 | int virt_carrier = 0; |
681 | int phys_carrier = 0; | |
8b07d521 | 682 | |
0b99d589 LL |
683 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
684 | return; | |
685 | ||
686 | bd = ch->ch_bd; | |
687 | ||
688 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
689 | return; | |
690 | ||
f1e51745 | 691 | if (ch->ch_mistat & UART_MSR_DCD) |
0b99d589 | 692 | phys_carrier = 1; |
0b99d589 | 693 | |
50667c67 | 694 | if (ch->ch_digi.digi_flags & DIGI_FORCEDCD) |
0b99d589 | 695 | virt_carrier = 1; |
0b99d589 | 696 | |
50667c67 | 697 | if (ch->ch_c_cflag & CLOCAL) |
0b99d589 | 698 | virt_carrier = 1; |
0b99d589 | 699 | |
0b99d589 LL |
700 | /* |
701 | * Test for a VIRTUAL carrier transition to HIGH. | |
702 | */ | |
703 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
0b99d589 LL |
704 | /* |
705 | * When carrier rises, wake any threads waiting | |
706 | * for carrier in the open routine. | |
707 | */ | |
708 | ||
7df227c4 | 709 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
710 | wake_up_interruptible(&ch->ch_flags_wait); |
711 | } | |
712 | ||
713 | /* | |
714 | * Test for a PHYSICAL carrier transition to HIGH. | |
715 | */ | |
716 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
0b99d589 LL |
717 | /* |
718 | * When carrier rises, wake any threads waiting | |
719 | * for carrier in the open routine. | |
720 | */ | |
721 | ||
7df227c4 | 722 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
723 | wake_up_interruptible(&ch->ch_flags_wait); |
724 | } | |
725 | ||
726 | /* | |
727 | * Test for a PHYSICAL transition to low, so long as we aren't | |
728 | * currently ignoring physical transitions (which is what "virtual | |
729 | * carrier" indicates). | |
730 | * | |
731 | * The transition of the virtual carrier to low really doesn't | |
732 | * matter... it really only means "ignore carrier state", not | |
733 | * "make pretend that carrier is there". | |
734 | */ | |
735 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) && | |
10352c2a | 736 | (phys_carrier == 0)) { |
0b99d589 LL |
737 | /* |
738 | * When carrier drops: | |
739 | * | |
740 | * Drop carrier on all open units. | |
741 | * | |
742 | * Flush queues, waking up any task waiting in the | |
743 | * line discipline. | |
744 | * | |
745 | * Send a hangup to the control terminal. | |
746 | * | |
747 | * Enable all select calls. | |
748 | */ | |
7df227c4 | 749 | if (waitqueue_active(&ch->ch_flags_wait)) |
0b99d589 LL |
750 | wake_up_interruptible(&ch->ch_flags_wait); |
751 | ||
f1e51745 | 752 | if (ch->ch_tun.un_open_count > 0) |
0b99d589 | 753 | tty_hangup(ch->ch_tun.un_tty); |
0b99d589 | 754 | |
f1e51745 | 755 | if (ch->ch_pun.un_open_count > 0) |
0b99d589 | 756 | tty_hangup(ch->ch_pun.un_tty); |
0b99d589 LL |
757 | } |
758 | ||
759 | /* | |
760 | * Make sure that our cached values reflect the current reality. | |
761 | */ | |
762 | if (virt_carrier == 1) | |
763 | ch->ch_flags |= CH_FCAR; | |
8b07d521 | 764 | else |
0b99d589 LL |
765 | ch->ch_flags &= ~CH_FCAR; |
766 | ||
767 | if (phys_carrier == 1) | |
768 | ch->ch_flags |= CH_CD; | |
769 | else | |
770 | ch->ch_flags &= ~CH_CD; | |
771 | } | |
772 | ||
773 | /* | |
774 | * Assign the custom baud rate to the channel structure | |
775 | */ | |
776 | static void dgnc_set_custom_speed(struct channel_t *ch, uint newrate) | |
777 | { | |
778 | int testdiv; | |
779 | int testrate_high; | |
8b07d521 | 780 | int testrate_low; |
0b99d589 LL |
781 | int deltahigh; |
782 | int deltalow; | |
783 | ||
93c76c9c DY |
784 | if (newrate <= 0) { |
785 | ch->ch_custom_speed = 0; | |
786 | return; | |
787 | } | |
0b99d589 LL |
788 | |
789 | /* | |
790 | * Since the divisor is stored in a 16-bit integer, we make sure | |
791 | * we don't allow any rates smaller than a 16-bit integer would allow. | |
792 | * And of course, rates above the dividend won't fly. | |
793 | */ | |
794 | if (newrate && newrate < ((ch->ch_bd->bd_dividend / 0xFFFF) + 1)) | |
0b7ceaa6 | 795 | newrate = (ch->ch_bd->bd_dividend / 0xFFFF) + 1; |
0b99d589 LL |
796 | |
797 | if (newrate && newrate > ch->ch_bd->bd_dividend) | |
90d2a471 | 798 | newrate = ch->ch_bd->bd_dividend; |
0b99d589 | 799 | |
93c76c9c | 800 | if (newrate > 0) { |
0b99d589 LL |
801 | testdiv = ch->ch_bd->bd_dividend / newrate; |
802 | ||
803 | /* | |
804 | * If we try to figure out what rate the board would use | |
805 | * with the test divisor, it will be either equal or higher | |
806 | * than the requested baud rate. If we then determine the | |
8b07d521 | 807 | * rate with a divisor one higher, we will get the next lower |
0b99d589 LL |
808 | * supported rate below the requested. |
809 | */ | |
810 | testrate_high = ch->ch_bd->bd_dividend / testdiv; | |
811 | testrate_low = ch->ch_bd->bd_dividend / (testdiv + 1); | |
812 | ||
813 | /* | |
814 | * If the rate for the requested divisor is correct, just | |
815 | * use it and be done. | |
816 | */ | |
93c76c9c DY |
817 | if (testrate_high != newrate) { |
818 | /* | |
851f306d CM |
819 | * Otherwise, pick the rate that is closer |
820 | * (i.e. whichever rate has a smaller delta). | |
93c76c9c DY |
821 | */ |
822 | deltahigh = testrate_high - newrate; | |
823 | deltalow = newrate - testrate_low; | |
0b99d589 | 824 | |
50667c67 | 825 | if (deltahigh < deltalow) |
93c76c9c | 826 | newrate = testrate_high; |
50667c67 | 827 | else |
93c76c9c | 828 | newrate = testrate_low; |
0b99d589 | 829 | } |
0b99d589 | 830 | } |
8b07d521 | 831 | |
0b99d589 | 832 | ch->ch_custom_speed = newrate; |
0b99d589 LL |
833 | } |
834 | ||
0b99d589 LL |
835 | void dgnc_check_queue_flow_control(struct channel_t *ch) |
836 | { | |
d09c1b96 | 837 | int qleft; |
0b99d589 LL |
838 | |
839 | /* Store how much space we have left in the queue */ | |
f7c851d4 CP |
840 | qleft = ch->ch_r_tail - ch->ch_r_head - 1; |
841 | if (qleft < 0) | |
0b99d589 LL |
842 | qleft += RQUEUEMASK + 1; |
843 | ||
844 | /* | |
845 | * Check to see if we should enforce flow control on our queue because | |
846 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
847 | * | |
848 | * NOTE: This is done based on what the current flow control of the | |
849 | * port is set for. | |
850 | * | |
851 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
852 | * This will cause the UART's FIFO to back up, and force | |
853 | * the RTS signal to be dropped. | |
854 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
855 | * the other side, in hopes it will stop sending data to us. | |
856 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
857 | * that gets sent into us when the queue fills up. | |
858 | */ | |
859 | if (qleft < 256) { | |
860 | /* HWFLOW */ | |
851f306d CM |
861 | if (ch->ch_digi.digi_flags & CTSPACE || |
862 | ch->ch_c_cflag & CRTSCTS) { | |
a82477c3 | 863 | if (!(ch->ch_flags & CH_RECEIVER_OFF)) { |
0b99d589 LL |
864 | ch->ch_bd->bd_ops->disable_receiver(ch); |
865 | ch->ch_flags |= (CH_RECEIVER_OFF); | |
0b99d589 LL |
866 | } |
867 | } | |
868 | /* SWFLOW */ | |
869 | else if (ch->ch_c_iflag & IXOFF) { | |
870 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
871 | ch->ch_bd->bd_ops->send_stop_character(ch); | |
872 | ch->ch_stops_sent++; | |
0b99d589 LL |
873 | } |
874 | } | |
0b99d589 LL |
875 | } |
876 | ||
877 | /* | |
878 | * Check to see if we should unenforce flow control because | |
879 | * ld (or user) finally read enuf data out of our queue. | |
880 | * | |
881 | * NOTE: This is done based on what the current flow control of the | |
882 | * port is set for. | |
883 | * | |
884 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
885 | * This will cause the UART's FIFO to raise RTS back up, | |
886 | * which will allow the other side to start sending data again. | |
887 | * 2) SWFLOW (IXOFF) - Send a start character to | |
888 | * the other side, so it will start sending data to us again. | |
889 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
890 | * other side, we don't need to do anything now. | |
891 | */ | |
892 | if (qleft > (RQUEUESIZE / 2)) { | |
893 | /* HWFLOW */ | |
851f306d CM |
894 | if (ch->ch_digi.digi_flags & RTSPACE || |
895 | ch->ch_c_cflag & CRTSCTS) { | |
0b99d589 LL |
896 | if (ch->ch_flags & CH_RECEIVER_OFF) { |
897 | ch->ch_bd->bd_ops->enable_receiver(ch); | |
898 | ch->ch_flags &= ~(CH_RECEIVER_OFF); | |
0b99d589 LL |
899 | } |
900 | } | |
901 | /* SWFLOW */ | |
902 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
903 | ch->ch_stops_sent = 0; | |
904 | ch->ch_bd->bd_ops->send_start_character(ch); | |
0b99d589 | 905 | } |
0b99d589 LL |
906 | } |
907 | } | |
908 | ||
0b99d589 LL |
909 | void dgnc_wakeup_writes(struct channel_t *ch) |
910 | { | |
911 | int qlen = 0; | |
a44b508a | 912 | unsigned long flags; |
0b99d589 LL |
913 | |
914 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
915 | return; | |
916 | ||
a44b508a | 917 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
918 | |
919 | /* | |
920 | * If channel now has space, wake up anyone waiting on the condition. | |
921 | */ | |
f7c851d4 CP |
922 | qlen = ch->ch_w_head - ch->ch_w_tail; |
923 | if (qlen < 0) | |
90d2a471 | 924 | qlen += WQUEUESIZE; |
0b99d589 LL |
925 | |
926 | if (qlen >= (WQUEUESIZE - 256)) { | |
a44b508a | 927 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
928 | return; |
929 | } | |
930 | ||
931 | if (ch->ch_tun.un_flags & UN_ISOPEN) { | |
6aa56785 | 932 | tty_wakeup(ch->ch_tun.un_tty); |
0b99d589 LL |
933 | |
934 | /* | |
935 | * If unit is set to wait until empty, check to make sure | |
936 | * the queue AND FIFO are both empty. | |
937 | */ | |
938 | if (ch->ch_tun.un_flags & UN_EMPTY) { | |
851f306d | 939 | if ((qlen == 0) && |
e352d3f1 | 940 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) { |
0b99d589 LL |
941 | ch->ch_tun.un_flags &= ~(UN_EMPTY); |
942 | ||
943 | /* | |
944 | * If RTS Toggle mode is on, whenever | |
945 | * the queue and UART is empty, keep RTS low. | |
946 | */ | |
947 | if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) { | |
948 | ch->ch_mostat &= ~(UART_MCR_RTS); | |
949 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
950 | } | |
951 | ||
952 | /* | |
953 | * If DTR Toggle mode is on, whenever | |
954 | * the queue and UART is empty, keep DTR low. | |
955 | */ | |
956 | if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) { | |
957 | ch->ch_mostat &= ~(UART_MCR_DTR); | |
958 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
959 | } | |
960 | } | |
961 | } | |
962 | ||
963 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); | |
964 | } | |
965 | ||
966 | if (ch->ch_pun.un_flags & UN_ISOPEN) { | |
6aa56785 | 967 | tty_wakeup(ch->ch_pun.un_tty); |
0b99d589 LL |
968 | |
969 | /* | |
970 | * If unit is set to wait until empty, check to make sure | |
971 | * the queue AND FIFO are both empty. | |
972 | */ | |
973 | if (ch->ch_pun.un_flags & UN_EMPTY) { | |
851f306d CM |
974 | if ((qlen == 0) && |
975 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) | |
0b99d589 | 976 | ch->ch_pun.un_flags &= ~(UN_EMPTY); |
0b99d589 LL |
977 | } |
978 | ||
979 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); | |
980 | } | |
981 | ||
a44b508a | 982 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
983 | } |
984 | ||
0b99d589 | 985 | /************************************************************************ |
8b07d521 | 986 | * |
0b99d589 | 987 | * TTY Entry points and helper functions |
8b07d521 | 988 | * |
0b99d589 LL |
989 | ************************************************************************/ |
990 | ||
991 | /* | |
992 | * dgnc_tty_open() | |
993 | * | |
994 | */ | |
995 | static int dgnc_tty_open(struct tty_struct *tty, struct file *file) | |
996 | { | |
03425f55 | 997 | struct dgnc_board *brd; |
0b99d589 LL |
998 | struct channel_t *ch; |
999 | struct un_t *un; | |
1000 | uint major = 0; | |
1001 | uint minor = 0; | |
1002 | int rc = 0; | |
a44b508a | 1003 | unsigned long flags; |
0b99d589 LL |
1004 | |
1005 | rc = 0; | |
1006 | ||
1007 | major = MAJOR(tty_devnum(tty)); | |
1008 | minor = MINOR(tty_devnum(tty)); | |
1009 | ||
50667c67 | 1010 | if (major > 255) |
0b99d589 | 1011 | return -ENXIO; |
0b99d589 LL |
1012 | |
1013 | /* Get board pointer from our array of majors we have allocated */ | |
1014 | brd = dgnc_BoardsByMajor[major]; | |
50667c67 | 1015 | if (!brd) |
0b99d589 | 1016 | return -ENXIO; |
0b99d589 LL |
1017 | |
1018 | /* | |
1019 | * If board is not yet up to a state of READY, go to | |
1020 | * sleep waiting for it to happen or they cancel the open. | |
1021 | */ | |
1022 | rc = wait_event_interruptible(brd->state_wait, | |
e352d3f1 | 1023 | (brd->state & BOARD_READY)); |
0b99d589 | 1024 | |
50667c67 | 1025 | if (rc) |
0b99d589 | 1026 | return rc; |
0b99d589 | 1027 | |
a44b508a | 1028 | spin_lock_irqsave(&brd->bd_lock, flags); |
0b99d589 LL |
1029 | |
1030 | /* If opened device is greater than our number of ports, bail. */ | |
4bef52f3 | 1031 | if (PORT_NUM(minor) >= brd->nasync) { |
a44b508a | 1032 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1033 | return -ENXIO; |
1034 | } | |
1035 | ||
1036 | ch = brd->channels[PORT_NUM(minor)]; | |
1037 | if (!ch) { | |
a44b508a | 1038 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1039 | return -ENXIO; |
1040 | } | |
1041 | ||
1042 | /* Drop board lock */ | |
a44b508a | 1043 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1044 | |
1045 | /* Grab channel lock */ | |
a44b508a | 1046 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1047 | |
1048 | /* Figure out our type */ | |
1049 | if (!IS_PRINT(minor)) { | |
1050 | un = &brd->channels[PORT_NUM(minor)]->ch_tun; | |
1051 | un->un_type = DGNC_SERIAL; | |
2000c581 | 1052 | } else if (IS_PRINT(minor)) { |
0b99d589 LL |
1053 | un = &brd->channels[PORT_NUM(minor)]->ch_pun; |
1054 | un->un_type = DGNC_PRINT; | |
2000c581 | 1055 | } else { |
a44b508a | 1056 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1057 | return -ENXIO; |
1058 | } | |
1059 | ||
1060 | /* | |
1061 | * If the port is still in a previous open, and in a state | |
1062 | * where we simply cannot safely keep going, wait until the | |
1063 | * state clears. | |
1064 | */ | |
a44b508a | 1065 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1066 | |
851f306d CM |
1067 | rc = wait_event_interruptible(ch->ch_flags_wait, |
1068 | ((ch->ch_flags & CH_OPENING) == 0)); | |
0b99d589 LL |
1069 | |
1070 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 1071 | if (rc) |
0b99d589 | 1072 | return -EINTR; |
0b99d589 LL |
1073 | |
1074 | /* | |
1075 | * If either unit is in the middle of the fragile part of close, | |
1076 | * we just cannot touch the channel safely. | |
1077 | * Go to sleep, knowing that when the channel can be | |
1078 | * touched safely, the close routine will signal the | |
1079 | * ch_flags_wait to wake us back up. | |
1080 | */ | |
1081 | rc = wait_event_interruptible(ch->ch_flags_wait, | |
851f306d CM |
1082 | (((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & |
1083 | UN_CLOSING) == 0)); | |
0b99d589 LL |
1084 | |
1085 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 1086 | if (rc) |
0b99d589 | 1087 | return -EINTR; |
0b99d589 | 1088 | |
a44b508a | 1089 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1090 | |
0b99d589 LL |
1091 | /* Store our unit into driver_data, so we always have it available. */ |
1092 | tty->driver_data = un; | |
1093 | ||
0b99d589 LL |
1094 | /* |
1095 | * Initialize tty's | |
1096 | */ | |
1097 | if (!(un->un_flags & UN_ISOPEN)) { | |
1098 | /* Store important variables. */ | |
1099 | un->un_tty = tty; | |
1100 | ||
1101 | /* Maybe do something here to the TTY struct as well? */ | |
1102 | } | |
1103 | ||
0b99d589 LL |
1104 | /* |
1105 | * Allocate channel buffers for read/write/error. | |
1106 | * Set flag, so we don't get trounced on. | |
1107 | */ | |
1108 | ch->ch_flags |= (CH_OPENING); | |
1109 | ||
1110 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
a44b508a | 1111 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1112 | |
1113 | if (!ch->ch_rqueue) | |
52f9d668 | 1114 | ch->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1115 | if (!ch->ch_equeue) |
52f9d668 | 1116 | ch->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1117 | if (!ch->ch_wqueue) |
52f9d668 | 1118 | ch->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1119 | |
a44b508a | 1120 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1121 | |
1122 | ch->ch_flags &= ~(CH_OPENING); | |
1123 | wake_up_interruptible(&ch->ch_flags_wait); | |
1124 | ||
1125 | /* | |
1126 | * Initialize if neither terminal or printer is open. | |
1127 | */ | |
1128 | if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_ISOPEN)) { | |
0b99d589 LL |
1129 | /* |
1130 | * Flush input queues. | |
1131 | */ | |
587abd7b SL |
1132 | ch->ch_r_head = 0; |
1133 | ch->ch_r_tail = 0; | |
1134 | ch->ch_e_head = 0; | |
1135 | ch->ch_e_tail = 0; | |
1136 | ch->ch_w_head = 0; | |
1137 | ch->ch_w_tail = 0; | |
0b99d589 LL |
1138 | |
1139 | brd->bd_ops->flush_uart_write(ch); | |
1140 | brd->bd_ops->flush_uart_read(ch); | |
1141 | ||
1142 | ch->ch_flags = 0; | |
1143 | ch->ch_cached_lsr = 0; | |
1144 | ch->ch_stop_sending_break = 0; | |
1145 | ch->ch_stops_sent = 0; | |
1146 | ||
22e3de76 LL |
1147 | ch->ch_c_cflag = tty->termios.c_cflag; |
1148 | ch->ch_c_iflag = tty->termios.c_iflag; | |
1149 | ch->ch_c_oflag = tty->termios.c_oflag; | |
1150 | ch->ch_c_lflag = tty->termios.c_lflag; | |
1151 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
1152 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
1153 | |
1154 | /* | |
1155 | * Bring up RTS and DTR... | |
1156 | * Also handle RTS or DTR toggle if set. | |
1157 | */ | |
1158 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
1159 | ch->ch_mostat |= (UART_MCR_RTS); | |
1160 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
1161 | ch->ch_mostat |= (UART_MCR_DTR); | |
1162 | ||
1163 | /* Tell UART to init itself */ | |
1164 | brd->bd_ops->uart_init(ch); | |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * Run param in case we changed anything | |
1169 | */ | |
1170 | brd->bd_ops->param(tty); | |
1171 | ||
1172 | dgnc_carrier(ch); | |
1173 | ||
8b07d521 | 1174 | /* |
0b99d589 LL |
1175 | * follow protocol for opening port |
1176 | */ | |
1177 | ||
a44b508a | 1178 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1179 | |
1180 | rc = dgnc_block_til_ready(tty, file, ch); | |
1181 | ||
0b99d589 | 1182 | /* No going back now, increment our unit and channel counters */ |
a44b508a | 1183 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1184 | ch->ch_open_count++; |
1185 | un->un_open_count++; | |
1186 | un->un_flags |= (UN_ISOPEN); | |
a44b508a | 1187 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1188 | |
8f90ef80 | 1189 | return rc; |
0b99d589 LL |
1190 | } |
1191 | ||
8b07d521 | 1192 | /* |
0b99d589 LL |
1193 | * dgnc_block_til_ready() |
1194 | * | |
1195 | * Wait for DCD, if needed. | |
1196 | */ | |
851f306d CM |
1197 | static int dgnc_block_til_ready(struct tty_struct *tty, |
1198 | struct file *file, | |
1199 | struct channel_t *ch) | |
8b07d521 | 1200 | { |
0b99d589 LL |
1201 | int retval = 0; |
1202 | struct un_t *un = NULL; | |
a44b508a | 1203 | unsigned long flags; |
0b99d589 LL |
1204 | uint old_flags = 0; |
1205 | int sleep_on_un_flags = 0; | |
1206 | ||
851f306d CM |
1207 | if (!tty || tty->magic != TTY_MAGIC || !file || !ch || |
1208 | ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1209 | return -ENXIO; |
0b99d589 LL |
1210 | |
1211 | un = tty->driver_data; | |
50667c67 | 1212 | if (!un || un->magic != DGNC_UNIT_MAGIC) |
8f90ef80 | 1213 | return -ENXIO; |
0b99d589 | 1214 | |
a44b508a | 1215 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1216 | |
1217 | ch->ch_wopen++; | |
1218 | ||
1219 | /* Loop forever */ | |
1220 | while (1) { | |
0b99d589 LL |
1221 | sleep_on_un_flags = 0; |
1222 | ||
1223 | /* | |
851f306d CM |
1224 | * If board has failed somehow during our sleep, |
1225 | * bail with error. | |
0b99d589 LL |
1226 | */ |
1227 | if (ch->ch_bd->state == BOARD_FAILED) { | |
1228 | retval = -ENXIO; | |
1229 | break; | |
1230 | } | |
1231 | ||
1232 | /* If tty was hung up, break out of loop and set error. */ | |
1233 | if (tty_hung_up_p(file)) { | |
1234 | retval = -EAGAIN; | |
1235 | break; | |
1236 | } | |
1237 | ||
1238 | /* | |
1239 | * If either unit is in the middle of the fragile part of close, | |
1240 | * we just cannot touch the channel safely. | |
1241 | * Go back to sleep, knowing that when the channel can be | |
8b07d521 | 1242 | * touched safely, the close routine will signal the |
0b99d589 LL |
1243 | * ch_wait_flags to wake us back up. |
1244 | */ | |
851f306d CM |
1245 | if (!((ch->ch_tun.un_flags | |
1246 | ch->ch_pun.un_flags) & | |
1247 | UN_CLOSING)) { | |
0b99d589 LL |
1248 | /* |
1249 | * Our conditions to leave cleanly and happily: | |
1250 | * 1) NONBLOCKING on the tty is set. | |
1251 | * 2) CLOCAL is set. | |
1252 | * 3) DCD (fake or real) is active. | |
1253 | */ | |
1254 | ||
50667c67 | 1255 | if (file->f_flags & O_NONBLOCK) |
0b99d589 | 1256 | break; |
0b99d589 LL |
1257 | |
1258 | if (tty->flags & (1 << TTY_IO_ERROR)) { | |
1259 | retval = -EIO; | |
1260 | break; | |
1261 | } | |
1262 | ||
f1e51745 | 1263 | if (ch->ch_flags & CH_CD) |
0b99d589 | 1264 | break; |
0b99d589 | 1265 | |
f1e51745 | 1266 | if (ch->ch_flags & CH_FCAR) |
0b99d589 | 1267 | break; |
2000c581 | 1268 | } else { |
0b99d589 LL |
1269 | sleep_on_un_flags = 1; |
1270 | } | |
1271 | ||
1272 | /* | |
1273 | * If there is a signal pending, the user probably | |
1274 | * interrupted (ctrl-c) us. | |
1275 | * Leave loop with error set. | |
1276 | */ | |
1277 | if (signal_pending(current)) { | |
0b99d589 LL |
1278 | retval = -ERESTARTSYS; |
1279 | break; | |
1280 | } | |
1281 | ||
0b99d589 LL |
1282 | /* |
1283 | * Store the flags before we let go of channel lock | |
1284 | */ | |
1285 | if (sleep_on_un_flags) | |
1286 | old_flags = ch->ch_tun.un_flags | ch->ch_pun.un_flags; | |
1287 | else | |
1288 | old_flags = ch->ch_flags; | |
1289 | ||
1290 | /* | |
1291 | * Let go of channel lock before calling schedule. | |
1292 | * Our poller will get any FEP events and wake us up when DCD | |
1293 | * eventually goes active. | |
1294 | */ | |
1295 | ||
a44b508a | 1296 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1297 | |
0b99d589 | 1298 | /* |
851f306d CM |
1299 | * Wait for something in the flags to change |
1300 | * from the current value. | |
0b99d589 | 1301 | */ |
50667c67 | 1302 | if (sleep_on_un_flags) |
0b99d589 | 1303 | retval = wait_event_interruptible(un->un_flags_wait, |
851f306d CM |
1304 | (old_flags != (ch->ch_tun.un_flags | |
1305 | ch->ch_pun.un_flags))); | |
50667c67 | 1306 | else |
0b99d589 LL |
1307 | retval = wait_event_interruptible(ch->ch_flags_wait, |
1308 | (old_flags != ch->ch_flags)); | |
0b99d589 | 1309 | |
0b99d589 LL |
1310 | /* |
1311 | * We got woken up for some reason. | |
1312 | * Before looping around, grab our channel lock. | |
1313 | */ | |
a44b508a | 1314 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1315 | } |
1316 | ||
1317 | ch->ch_wopen--; | |
1318 | ||
a44b508a | 1319 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1320 | |
36e712a8 | 1321 | return retval; |
0b99d589 LL |
1322 | } |
1323 | ||
0b99d589 LL |
1324 | /* |
1325 | * dgnc_tty_hangup() | |
1326 | * | |
1327 | * Hangup the port. Like a close, but don't wait for output to drain. | |
8b07d521 | 1328 | */ |
0b99d589 LL |
1329 | static void dgnc_tty_hangup(struct tty_struct *tty) |
1330 | { | |
1331 | struct un_t *un; | |
1332 | ||
1333 | if (!tty || tty->magic != TTY_MAGIC) | |
1334 | return; | |
1335 | ||
1336 | un = tty->driver_data; | |
1337 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1338 | return; | |
1339 | ||
0b99d589 LL |
1340 | /* flush the transmit queues */ |
1341 | dgnc_tty_flush_buffer(tty); | |
0b99d589 LL |
1342 | } |
1343 | ||
0b99d589 LL |
1344 | /* |
1345 | * dgnc_tty_close() | |
1346 | * | |
1347 | */ | |
1348 | static void dgnc_tty_close(struct tty_struct *tty, struct file *file) | |
1349 | { | |
03425f55 | 1350 | struct dgnc_board *bd; |
0b99d589 LL |
1351 | struct channel_t *ch; |
1352 | struct un_t *un; | |
a44b508a | 1353 | unsigned long flags; |
0b99d589 LL |
1354 | |
1355 | if (!tty || tty->magic != TTY_MAGIC) | |
1356 | return; | |
1357 | ||
1358 | un = tty->driver_data; | |
1359 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1360 | return; | |
1361 | ||
1362 | ch = un->un_ch; | |
1363 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1364 | return; | |
1365 | ||
1366 | bd = ch->ch_bd; | |
1367 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1368 | return; | |
1369 | ||
a44b508a | 1370 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1371 | |
1372 | /* | |
1373 | * Determine if this is the last close or not - and if we agree about | |
1374 | * which type of close it is with the Line Discipline | |
1375 | */ | |
1376 | if ((tty->count == 1) && (un->un_open_count != 1)) { | |
1377 | /* | |
1378 | * Uh, oh. tty->count is 1, which means that the tty | |
1379 | * structure will be freed. un_open_count should always | |
1380 | * be one in these conditions. If it's greater than | |
1381 | * one, we've got real problems, since it means the | |
1382 | * serial port won't be shutdown. | |
1383 | */ | |
1f26adc9 RD |
1384 | dev_dbg(tty->dev, |
1385 | "tty->count is 1, un open count is %d\n", | |
1386 | un->un_open_count); | |
0b99d589 | 1387 | un->un_open_count = 1; |
8b07d521 | 1388 | } |
0b99d589 | 1389 | |
3098e514 DY |
1390 | if (un->un_open_count) |
1391 | un->un_open_count--; | |
1392 | else | |
1f26adc9 RD |
1393 | dev_dbg(tty->dev, |
1394 | "bad serial port open count of %d\n", | |
1395 | un->un_open_count); | |
0b99d589 LL |
1396 | |
1397 | ch->ch_open_count--; | |
1398 | ||
1399 | if (ch->ch_open_count && un->un_open_count) { | |
a44b508a | 1400 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
90d2a471 LL |
1401 | return; |
1402 | } | |
0b99d589 LL |
1403 | |
1404 | /* OK, its the last close on the unit */ | |
0b99d589 LL |
1405 | un->un_flags |= UN_CLOSING; |
1406 | ||
1407 | tty->closing = 1; | |
1408 | ||
0b99d589 LL |
1409 | /* |
1410 | * Only officially close channel if count is 0 and | |
90d2a471 | 1411 | * DIGI_PRINTER bit is not set. |
0b99d589 | 1412 | */ |
851f306d CM |
1413 | if ((ch->ch_open_count == 0) && |
1414 | !(ch->ch_digi.digi_flags & DIGI_PRINTER)) { | |
0b99d589 LL |
1415 | ch->ch_flags &= ~(CH_STOPI | CH_FORCED_STOPI); |
1416 | ||
1417 | /* | |
1418 | * turn off print device when closing print device. | |
1419 | */ | |
9cdf838b | 1420 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1421 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1422 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1423 | ch->ch_flags &= ~CH_PRON; |
1424 | } | |
1425 | ||
a44b508a | 1426 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1427 | /* wait for output to drain */ |
1428 | /* This will also return if we take an interrupt */ | |
1429 | ||
2d9920ec | 1430 | bd->bd_ops->drain(tty, 0); |
0b99d589 | 1431 | |
0b99d589 LL |
1432 | dgnc_tty_flush_buffer(tty); |
1433 | tty_ldisc_flush(tty); | |
1434 | ||
a44b508a | 1435 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1436 | |
1437 | tty->closing = 0; | |
1438 | ||
1439 | /* | |
1440 | * If we have HUPCL set, lower DTR and RTS | |
1441 | */ | |
1442 | if (ch->ch_c_cflag & HUPCL) { | |
0b99d589 LL |
1443 | /* Drop RTS/DTR */ |
1444 | ch->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
1445 | bd->bd_ops->assert_modem_signals(ch); | |
1446 | ||
1447 | /* | |
8b07d521 | 1448 | * Go to sleep to ensure RTS/DTR |
0b99d589 LL |
1449 | * have been dropped for modems to see it. |
1450 | */ | |
1451 | if (ch->ch_close_delay) { | |
a44b508a RD |
1452 | spin_unlock_irqrestore(&ch->ch_lock, |
1453 | flags); | |
0b99d589 | 1454 | dgnc_ms_sleep(ch->ch_close_delay); |
a44b508a | 1455 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1456 | } |
1457 | } | |
1458 | ||
1459 | ch->ch_old_baud = 0; | |
1460 | ||
1461 | /* Turn off UART interrupts for this port */ | |
1462 | ch->ch_bd->bd_ops->uart_off(ch); | |
2000c581 | 1463 | } else { |
0b99d589 LL |
1464 | /* |
1465 | * turn off print device when closing print device. | |
1466 | */ | |
9cdf838b | 1467 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1468 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
e352d3f1 | 1469 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1470 | ch->ch_flags &= ~CH_PRON; |
1471 | } | |
1472 | } | |
1473 | ||
1474 | un->un_tty = NULL; | |
1475 | un->un_flags &= ~(UN_ISOPEN | UN_CLOSING); | |
1476 | ||
0b99d589 LL |
1477 | wake_up_interruptible(&ch->ch_flags_wait); |
1478 | wake_up_interruptible(&un->un_flags_wait); | |
1479 | ||
a44b508a | 1480 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1481 | } |
1482 | ||
0b99d589 LL |
1483 | /* |
1484 | * dgnc_tty_chars_in_buffer() | |
1485 | * | |
1486 | * Return number of characters that have not been transmitted yet. | |
1487 | * | |
1488 | * This routine is used by the line discipline to determine if there | |
1489 | * is data waiting to be transmitted/drained/flushed or not. | |
1490 | */ | |
1491 | static int dgnc_tty_chars_in_buffer(struct tty_struct *tty) | |
1492 | { | |
1493 | struct channel_t *ch = NULL; | |
1494 | struct un_t *un = NULL; | |
1495 | ushort thead; | |
1496 | ushort ttail; | |
1497 | uint tmask; | |
1498 | uint chars = 0; | |
a44b508a | 1499 | unsigned long flags; |
0b99d589 | 1500 | |
60acb623 | 1501 | if (!tty) |
8f90ef80 | 1502 | return 0; |
0b99d589 LL |
1503 | |
1504 | un = tty->driver_data; | |
1505 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1506 | return 0; |
0b99d589 LL |
1507 | |
1508 | ch = un->un_ch; | |
1509 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1510 | return 0; |
0b99d589 | 1511 | |
a44b508a | 1512 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1513 | |
1514 | tmask = WQUEUEMASK; | |
1515 | thead = ch->ch_w_head & tmask; | |
1516 | ttail = ch->ch_w_tail & tmask; | |
1517 | ||
a44b508a | 1518 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1519 | |
1520 | if (ttail == thead) { | |
1521 | chars = 0; | |
1522 | } else { | |
1523 | if (thead >= ttail) | |
1524 | chars = thead - ttail; | |
1525 | else | |
1526 | chars = thead - ttail + WQUEUESIZE; | |
1527 | } | |
1528 | ||
8f90ef80 | 1529 | return chars; |
0b99d589 LL |
1530 | } |
1531 | ||
8b07d521 | 1532 | /* |
0b99d589 LL |
1533 | * dgnc_maxcps_room |
1534 | * | |
1535 | * Reduces bytes_available to the max number of characters | |
1536 | * that can be sent currently given the maxcps value, and | |
1537 | * returns the new bytes_available. This only affects printer | |
1538 | * output. | |
8b07d521 | 1539 | */ |
0b99d589 LL |
1540 | static int dgnc_maxcps_room(struct tty_struct *tty, int bytes_available) |
1541 | { | |
1542 | struct channel_t *ch = NULL; | |
1543 | struct un_t *un = NULL; | |
1544 | ||
1545 | if (!tty) | |
8f90ef80 | 1546 | return bytes_available; |
0b99d589 LL |
1547 | |
1548 | un = tty->driver_data; | |
1549 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1550 | return bytes_available; |
0b99d589 LL |
1551 | |
1552 | ch = un->un_ch; | |
1553 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1554 | return bytes_available; |
0b99d589 LL |
1555 | |
1556 | /* | |
1557 | * If its not the Transparent print device, return | |
1558 | * the full data amount. | |
1559 | */ | |
1560 | if (un->un_type != DGNC_PRINT) | |
8f90ef80 | 1561 | return bytes_available; |
0b99d589 | 1562 | |
9cdf838b | 1563 | if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0) { |
0b99d589 LL |
1564 | int cps_limit = 0; |
1565 | unsigned long current_time = jiffies; | |
1566 | unsigned long buffer_time = current_time + | |
851f306d CM |
1567 | (HZ * ch->ch_digi.digi_bufsize) / |
1568 | ch->ch_digi.digi_maxcps; | |
0b99d589 LL |
1569 | |
1570 | if (ch->ch_cpstime < current_time) { | |
1571 | /* buffer is empty */ | |
851f306d | 1572 | ch->ch_cpstime = current_time; /* reset ch_cpstime */ |
0b99d589 | 1573 | cps_limit = ch->ch_digi.digi_bufsize; |
2000c581 | 1574 | } else if (ch->ch_cpstime < buffer_time) { |
0b99d589 | 1575 | /* still room in the buffer */ |
851f306d CM |
1576 | cps_limit = ((buffer_time - ch->ch_cpstime) * |
1577 | ch->ch_digi.digi_maxcps) / HZ; | |
2000c581 | 1578 | } else { |
0b99d589 | 1579 | /* no room in the buffer */ |
8b07d521 | 1580 | cps_limit = 0; |
0b99d589 LL |
1581 | } |
1582 | ||
1583 | bytes_available = min(cps_limit, bytes_available); | |
1584 | } | |
1585 | ||
8f90ef80 | 1586 | return bytes_available; |
0b99d589 LL |
1587 | } |
1588 | ||
0b99d589 LL |
1589 | /* |
1590 | * dgnc_tty_write_room() | |
1591 | * | |
1592 | * Return space available in Tx buffer | |
8b07d521 | 1593 | */ |
0b99d589 LL |
1594 | static int dgnc_tty_write_room(struct tty_struct *tty) |
1595 | { | |
1596 | struct channel_t *ch = NULL; | |
1597 | struct un_t *un = NULL; | |
1598 | ushort head; | |
1599 | ushort tail; | |
1600 | ushort tmask; | |
1601 | int ret = 0; | |
a44b508a | 1602 | unsigned long flags; |
0b99d589 | 1603 | |
60acb623 | 1604 | if (!tty || !dgnc_TmpWriteBuf) |
8f90ef80 | 1605 | return 0; |
0b99d589 LL |
1606 | |
1607 | un = tty->driver_data; | |
1608 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1609 | return 0; |
0b99d589 LL |
1610 | |
1611 | ch = un->un_ch; | |
1612 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1613 | return 0; |
0b99d589 | 1614 | |
a44b508a | 1615 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1616 | |
1617 | tmask = WQUEUEMASK; | |
1618 | head = (ch->ch_w_head) & tmask; | |
1619 | tail = (ch->ch_w_tail) & tmask; | |
1620 | ||
f7c851d4 CP |
1621 | ret = tail - head - 1; |
1622 | if (ret < 0) | |
0b99d589 LL |
1623 | ret += WQUEUESIZE; |
1624 | ||
1625 | /* Limit printer to maxcps */ | |
1626 | ret = dgnc_maxcps_room(tty, ret); | |
1627 | ||
1628 | /* | |
8b07d521 | 1629 | * If we are printer device, leave space for |
0b99d589 LL |
1630 | * possibly both the on and off strings. |
1631 | */ | |
1632 | if (un->un_type == DGNC_PRINT) { | |
1633 | if (!(ch->ch_flags & CH_PRON)) | |
1634 | ret -= ch->ch_digi.digi_onlen; | |
1635 | ret -= ch->ch_digi.digi_offlen; | |
2000c581 | 1636 | } else { |
0b99d589 LL |
1637 | if (ch->ch_flags & CH_PRON) |
1638 | ret -= ch->ch_digi.digi_offlen; | |
1639 | } | |
1640 | ||
1641 | if (ret < 0) | |
1642 | ret = 0; | |
1643 | ||
a44b508a | 1644 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8b07d521 | 1645 | |
8f90ef80 | 1646 | return ret; |
0b99d589 LL |
1647 | } |
1648 | ||
0b99d589 LL |
1649 | /* |
1650 | * dgnc_tty_put_char() | |
1651 | * | |
1652 | * Put a character into ch->ch_buf | |
8b07d521 | 1653 | * |
0b99d589 LL |
1654 | * - used by the line discipline for OPOST processing |
1655 | */ | |
1656 | static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c) | |
1657 | { | |
1658 | /* | |
1659 | * Simply call tty_write. | |
1660 | */ | |
0b99d589 LL |
1661 | dgnc_tty_write(tty, &c, 1); |
1662 | return 1; | |
1663 | } | |
1664 | ||
0b99d589 LL |
1665 | /* |
1666 | * dgnc_tty_write() | |
1667 | * | |
1668 | * Take data from the user or kernel and send it out to the FEP. | |
1669 | * In here exists all the Transparent Print magic as well. | |
1670 | */ | |
1671 | static int dgnc_tty_write(struct tty_struct *tty, | |
e352d3f1 | 1672 | const unsigned char *buf, int count) |
0b99d589 LL |
1673 | { |
1674 | struct channel_t *ch = NULL; | |
1675 | struct un_t *un = NULL; | |
1676 | int bufcount = 0, n = 0; | |
a44b508a | 1677 | unsigned long flags; |
0b99d589 LL |
1678 | ushort head; |
1679 | ushort tail; | |
1680 | ushort tmask; | |
1681 | uint remain; | |
0b99d589 | 1682 | |
60acb623 | 1683 | if (!tty || !dgnc_TmpWriteBuf) |
8f90ef80 | 1684 | return 0; |
0b99d589 LL |
1685 | |
1686 | un = tty->driver_data; | |
1687 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1688 | return 0; |
0b99d589 LL |
1689 | |
1690 | ch = un->un_ch; | |
1691 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1692 | return 0; |
0b99d589 LL |
1693 | |
1694 | if (!count) | |
8f90ef80 | 1695 | return 0; |
0b99d589 | 1696 | |
0b99d589 LL |
1697 | /* |
1698 | * Store original amount of characters passed in. | |
1699 | * This helps to figure out if we should ask the FEP | |
1700 | * to send us an event when it has more space available. | |
1701 | */ | |
0b99d589 | 1702 | |
a44b508a | 1703 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1704 | |
1705 | /* Get our space available for the channel from the board */ | |
1706 | tmask = WQUEUEMASK; | |
1707 | head = (ch->ch_w_head) & tmask; | |
1708 | tail = (ch->ch_w_tail) & tmask; | |
1709 | ||
f7c851d4 CP |
1710 | bufcount = tail - head - 1; |
1711 | if (bufcount < 0) | |
0b99d589 LL |
1712 | bufcount += WQUEUESIZE; |
1713 | ||
0b99d589 LL |
1714 | /* |
1715 | * Limit printer output to maxcps overall, with bursts allowed | |
1716 | * up to bufsize characters. | |
1717 | */ | |
1718 | bufcount = dgnc_maxcps_room(tty, bufcount); | |
1719 | ||
1720 | /* | |
1721 | * Take minimum of what the user wants to send, and the | |
1722 | * space available in the FEP buffer. | |
1723 | */ | |
1724 | count = min(count, bufcount); | |
1725 | ||
1726 | /* | |
1727 | * Bail if no space left. | |
1728 | */ | |
c84a083b QL |
1729 | if (count <= 0) |
1730 | goto exit_retry; | |
0b99d589 LL |
1731 | |
1732 | /* | |
1733 | * Output the printer ON string, if we are in terminal mode, but | |
1734 | * need to be in printer mode. | |
1735 | */ | |
1736 | if ((un->un_type == DGNC_PRINT) && !(ch->ch_flags & CH_PRON)) { | |
1737 | dgnc_wmove(ch, ch->ch_digi.digi_onstr, | |
e352d3f1 | 1738 | (int)ch->ch_digi.digi_onlen); |
0b99d589 LL |
1739 | head = (ch->ch_w_head) & tmask; |
1740 | ch->ch_flags |= CH_PRON; | |
1741 | } | |
1742 | ||
1743 | /* | |
1744 | * On the other hand, output the printer OFF string, if we are | |
1745 | * currently in printer mode, but need to output to the terminal. | |
1746 | */ | |
1747 | if ((un->un_type != DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { | |
1748 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, | |
e352d3f1 | 1749 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1750 | head = (ch->ch_w_head) & tmask; |
1751 | ch->ch_flags &= ~CH_PRON; | |
1752 | } | |
1753 | ||
0b99d589 LL |
1754 | n = count; |
1755 | ||
1756 | /* | |
1757 | * If the write wraps over the top of the circular buffer, | |
1758 | * move the portion up to the wrap point, and reset the | |
1759 | * pointers to the bottom. | |
1760 | */ | |
1761 | remain = WQUEUESIZE - head; | |
1762 | ||
1763 | if (n >= remain) { | |
1764 | n -= remain; | |
1765 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1766 | head = 0; |
1767 | buf += remain; | |
1768 | } | |
1769 | ||
1770 | if (n > 0) { | |
1771 | /* | |
1772 | * Move rest of data. | |
1773 | */ | |
1774 | remain = n; | |
1775 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1776 | head += remain; |
1777 | } | |
1778 | ||
1779 | if (count) { | |
1780 | head &= tmask; | |
1781 | ch->ch_w_head = head; | |
1782 | } | |
1783 | ||
0b99d589 | 1784 | /* Update printer buffer empty time. */ |
8d0d4cc5 RS |
1785 | if ((un->un_type == DGNC_PRINT) && (ch->ch_digi.digi_maxcps > 0) && |
1786 | (ch->ch_digi.digi_bufsize > 0)) { | |
90d2a471 | 1787 | ch->ch_cpstime += (HZ * count) / ch->ch_digi.digi_maxcps; |
0b99d589 LL |
1788 | } |
1789 | ||
a74d8e21 | 1790 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1791 | |
0b99d589 LL |
1792 | if (count) { |
1793 | /* | |
1794 | * Channel lock is grabbed and then released | |
1795 | * inside this routine. | |
1796 | */ | |
1797 | ch->ch_bd->bd_ops->copy_data_from_queue_to_uart(ch); | |
1798 | } | |
1799 | ||
8f90ef80 | 1800 | return count; |
c84a083b QL |
1801 | |
1802 | exit_retry: | |
1803 | ||
1804 | spin_unlock_irqrestore(&ch->ch_lock, flags); | |
1805 | return 0; | |
0b99d589 LL |
1806 | } |
1807 | ||
0b99d589 LL |
1808 | /* |
1809 | * Return modem signals to ld. | |
1810 | */ | |
b74c7461 | 1811 | |
0b99d589 | 1812 | static int dgnc_tty_tiocmget(struct tty_struct *tty) |
0b99d589 LL |
1813 | { |
1814 | struct channel_t *ch; | |
1815 | struct un_t *un; | |
1816 | int result = -EIO; | |
446393e9 | 1817 | unsigned char mstat = 0; |
a44b508a | 1818 | unsigned long flags; |
0b99d589 LL |
1819 | |
1820 | if (!tty || tty->magic != TTY_MAGIC) | |
1821 | return result; | |
1822 | ||
1823 | un = tty->driver_data; | |
1824 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1825 | return result; | |
1826 | ||
1827 | ch = un->un_ch; | |
1828 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1829 | return result; | |
1830 | ||
a44b508a | 1831 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1832 | |
0b7ceaa6 | 1833 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 1834 | |
a44b508a | 1835 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1836 | |
1837 | result = 0; | |
1838 | ||
1839 | if (mstat & UART_MCR_DTR) | |
1840 | result |= TIOCM_DTR; | |
1841 | if (mstat & UART_MCR_RTS) | |
1842 | result |= TIOCM_RTS; | |
1843 | if (mstat & UART_MSR_CTS) | |
1844 | result |= TIOCM_CTS; | |
1845 | if (mstat & UART_MSR_DSR) | |
1846 | result |= TIOCM_DSR; | |
1847 | if (mstat & UART_MSR_RI) | |
1848 | result |= TIOCM_RI; | |
1849 | if (mstat & UART_MSR_DCD) | |
1850 | result |= TIOCM_CD; | |
1851 | ||
0b99d589 LL |
1852 | return result; |
1853 | } | |
1854 | ||
0b99d589 LL |
1855 | /* |
1856 | * dgnc_tty_tiocmset() | |
1857 | * | |
1858 | * Set modem signals, called by ld. | |
1859 | */ | |
b74c7461 | 1860 | |
0b99d589 | 1861 | static int dgnc_tty_tiocmset(struct tty_struct *tty, |
e352d3f1 | 1862 | unsigned int set, unsigned int clear) |
0b99d589 | 1863 | { |
03425f55 | 1864 | struct dgnc_board *bd; |
0b99d589 LL |
1865 | struct channel_t *ch; |
1866 | struct un_t *un; | |
1867 | int ret = -EIO; | |
a44b508a | 1868 | unsigned long flags; |
0b99d589 LL |
1869 | |
1870 | if (!tty || tty->magic != TTY_MAGIC) | |
1871 | return ret; | |
1872 | ||
1873 | un = tty->driver_data; | |
1874 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1875 | return ret; | |
1876 | ||
1877 | ch = un->un_ch; | |
1878 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1879 | return ret; | |
1880 | ||
1881 | bd = ch->ch_bd; | |
1882 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1883 | return ret; | |
1884 | ||
a44b508a | 1885 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1886 | |
50667c67 | 1887 | if (set & TIOCM_RTS) |
0b99d589 | 1888 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 1889 | |
50667c67 | 1890 | if (set & TIOCM_DTR) |
0b99d589 | 1891 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 | 1892 | |
50667c67 | 1893 | if (clear & TIOCM_RTS) |
0b99d589 | 1894 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 1895 | |
50667c67 | 1896 | if (clear & TIOCM_DTR) |
0b99d589 | 1897 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
1898 | |
1899 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
1900 | ||
a44b508a | 1901 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1902 | |
8f90ef80 | 1903 | return 0; |
0b99d589 LL |
1904 | } |
1905 | ||
0b99d589 LL |
1906 | /* |
1907 | * dgnc_tty_send_break() | |
1908 | * | |
1909 | * Send a Break, called by ld. | |
1910 | */ | |
1911 | static int dgnc_tty_send_break(struct tty_struct *tty, int msec) | |
1912 | { | |
03425f55 | 1913 | struct dgnc_board *bd; |
0b99d589 LL |
1914 | struct channel_t *ch; |
1915 | struct un_t *un; | |
1916 | int ret = -EIO; | |
a44b508a | 1917 | unsigned long flags; |
0b99d589 LL |
1918 | |
1919 | if (!tty || tty->magic != TTY_MAGIC) | |
1920 | return ret; | |
1921 | ||
1922 | un = tty->driver_data; | |
1923 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1924 | return ret; | |
1925 | ||
1926 | ch = un->un_ch; | |
1927 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1928 | return ret; | |
1929 | ||
1930 | bd = ch->ch_bd; | |
1931 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1932 | return ret; | |
1933 | ||
1934 | switch (msec) { | |
1935 | case -1: | |
1936 | msec = 0xFFFF; | |
1937 | break; | |
1938 | case 0: | |
1939 | msec = 0; | |
1940 | break; | |
1941 | default: | |
1942 | break; | |
1943 | } | |
1944 | ||
a44b508a | 1945 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1946 | |
1947 | ch->ch_bd->bd_ops->send_break(ch, msec); | |
1948 | ||
a44b508a | 1949 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1950 | |
8f90ef80 | 1951 | return 0; |
0b99d589 LL |
1952 | } |
1953 | ||
0b99d589 LL |
1954 | /* |
1955 | * dgnc_tty_wait_until_sent() | |
1956 | * | |
1957 | * wait until data has been transmitted, called by ld. | |
1958 | */ | |
1959 | static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
1960 | { | |
03425f55 | 1961 | struct dgnc_board *bd; |
0b99d589 LL |
1962 | struct channel_t *ch; |
1963 | struct un_t *un; | |
0b99d589 LL |
1964 | |
1965 | if (!tty || tty->magic != TTY_MAGIC) | |
1966 | return; | |
1967 | ||
1968 | un = tty->driver_data; | |
1969 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1970 | return; | |
1971 | ||
1972 | ch = un->un_ch; | |
1973 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1974 | return; | |
1975 | ||
1976 | bd = ch->ch_bd; | |
1977 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1978 | return; | |
1979 | ||
2d9920ec | 1980 | bd->bd_ops->drain(tty, 0); |
8b07d521 | 1981 | } |
0b99d589 | 1982 | |
0b99d589 LL |
1983 | /* |
1984 | * dgnc_send_xchar() | |
1985 | * | |
1986 | * send a high priority character, called by ld. | |
1987 | */ | |
1988 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char c) | |
1989 | { | |
03425f55 | 1990 | struct dgnc_board *bd; |
0b99d589 LL |
1991 | struct channel_t *ch; |
1992 | struct un_t *un; | |
a44b508a | 1993 | unsigned long flags; |
0b99d589 LL |
1994 | |
1995 | if (!tty || tty->magic != TTY_MAGIC) | |
1996 | return; | |
1997 | ||
1998 | un = tty->driver_data; | |
1999 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2000 | return; | |
2001 | ||
2002 | ch = un->un_ch; | |
2003 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2004 | return; | |
2005 | ||
2006 | bd = ch->ch_bd; | |
2007 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2008 | return; | |
2009 | ||
f3dadd29 | 2010 | dev_dbg(tty->dev, "dgnc_tty_send_xchar start\n"); |
0b99d589 | 2011 | |
a44b508a | 2012 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2013 | bd->bd_ops->send_immediate_char(ch, c); |
a44b508a | 2014 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2015 | |
f3dadd29 | 2016 | dev_dbg(tty->dev, "dgnc_tty_send_xchar finish\n"); |
8b07d521 | 2017 | } |
0b99d589 | 2018 | |
0b99d589 LL |
2019 | /* |
2020 | * Return modem signals to ld. | |
2021 | */ | |
2022 | static inline int dgnc_get_mstat(struct channel_t *ch) | |
2023 | { | |
2024 | unsigned char mstat; | |
2025 | int result = -EIO; | |
a44b508a | 2026 | unsigned long flags; |
0b99d589 | 2027 | |
0b99d589 | 2028 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
8f90ef80 | 2029 | return -ENXIO; |
0b99d589 | 2030 | |
a44b508a | 2031 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2032 | |
0b7ceaa6 | 2033 | mstat = ch->ch_mostat | ch->ch_mistat; |
0b99d589 | 2034 | |
a44b508a | 2035 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2036 | |
2037 | result = 0; | |
2038 | ||
2039 | if (mstat & UART_MCR_DTR) | |
2040 | result |= TIOCM_DTR; | |
2041 | if (mstat & UART_MCR_RTS) | |
2042 | result |= TIOCM_RTS; | |
2043 | if (mstat & UART_MSR_CTS) | |
2044 | result |= TIOCM_CTS; | |
2045 | if (mstat & UART_MSR_DSR) | |
2046 | result |= TIOCM_DSR; | |
2047 | if (mstat & UART_MSR_RI) | |
2048 | result |= TIOCM_RI; | |
2049 | if (mstat & UART_MSR_DCD) | |
2050 | result |= TIOCM_CD; | |
2051 | ||
8f90ef80 | 2052 | return result; |
0b99d589 LL |
2053 | } |
2054 | ||
0b99d589 LL |
2055 | /* |
2056 | * Return modem signals to ld. | |
2057 | */ | |
851f306d CM |
2058 | static int dgnc_get_modem_info(struct channel_t *ch, |
2059 | unsigned int __user *value) | |
0b99d589 LL |
2060 | { |
2061 | int result; | |
0b99d589 | 2062 | |
0b99d589 | 2063 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
8f90ef80 | 2064 | return -ENXIO; |
0b99d589 LL |
2065 | |
2066 | result = dgnc_get_mstat(ch); | |
2067 | ||
2068 | if (result < 0) | |
8f90ef80 | 2069 | return -ENXIO; |
0b99d589 | 2070 | |
3dfe7557 | 2071 | return put_user(result, value); |
0b99d589 LL |
2072 | } |
2073 | ||
0b99d589 LL |
2074 | /* |
2075 | * dgnc_set_modem_info() | |
2076 | * | |
2077 | * Set modem signals, called by ld. | |
2078 | */ | |
851f306d CM |
2079 | static int dgnc_set_modem_info(struct tty_struct *tty, |
2080 | unsigned int command, | |
2081 | unsigned int __user *value) | |
0b99d589 | 2082 | { |
03425f55 | 2083 | struct dgnc_board *bd; |
0b99d589 LL |
2084 | struct channel_t *ch; |
2085 | struct un_t *un; | |
2086 | int ret = -ENXIO; | |
2087 | unsigned int arg = 0; | |
a44b508a | 2088 | unsigned long flags; |
0b99d589 LL |
2089 | |
2090 | if (!tty || tty->magic != TTY_MAGIC) | |
2091 | return ret; | |
2092 | ||
2093 | un = tty->driver_data; | |
2094 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2095 | return ret; | |
2096 | ||
2097 | ch = un->un_ch; | |
2098 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2099 | return ret; | |
2100 | ||
2101 | bd = ch->ch_bd; | |
2102 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2103 | return ret; | |
2104 | ||
0b99d589 LL |
2105 | ret = get_user(arg, value); |
2106 | if (ret) | |
8f90ef80 | 2107 | return ret; |
0b99d589 LL |
2108 | |
2109 | switch (command) { | |
2110 | case TIOCMBIS: | |
50667c67 | 2111 | if (arg & TIOCM_RTS) |
0b99d589 | 2112 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 2113 | |
50667c67 | 2114 | if (arg & TIOCM_DTR) |
0b99d589 | 2115 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 LL |
2116 | |
2117 | break; | |
2118 | ||
2119 | case TIOCMBIC: | |
50667c67 | 2120 | if (arg & TIOCM_RTS) |
0b99d589 | 2121 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 2122 | |
50667c67 | 2123 | if (arg & TIOCM_DTR) |
0b99d589 | 2124 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
2125 | |
2126 | break; | |
2127 | ||
90d2a471 | 2128 | case TIOCMSET: |
0b99d589 | 2129 | |
50667c67 | 2130 | if (arg & TIOCM_RTS) |
0b99d589 | 2131 | ch->ch_mostat |= UART_MCR_RTS; |
50667c67 | 2132 | else |
0b99d589 | 2133 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 2134 | |
50667c67 | 2135 | if (arg & TIOCM_DTR) |
0b99d589 | 2136 | ch->ch_mostat |= UART_MCR_DTR; |
50667c67 | 2137 | else |
0b99d589 | 2138 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
2139 | |
2140 | break; | |
2141 | ||
2142 | default: | |
8f90ef80 | 2143 | return -EINVAL; |
0b99d589 LL |
2144 | } |
2145 | ||
a44b508a | 2146 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2147 | |
2148 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
2149 | ||
a44b508a | 2150 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2151 | |
8f90ef80 | 2152 | return 0; |
0b99d589 LL |
2153 | } |
2154 | ||
0b99d589 | 2155 | /* |
8b07d521 | 2156 | * dgnc_tty_digigeta() |
0b99d589 LL |
2157 | * |
2158 | * Ioctl to get the information for ditty. | |
2159 | * | |
2160 | * | |
2161 | * | |
2162 | */ | |
851f306d CM |
2163 | static int dgnc_tty_digigeta(struct tty_struct *tty, |
2164 | struct digi_t __user *retinfo) | |
0b99d589 LL |
2165 | { |
2166 | struct channel_t *ch; | |
2167 | struct un_t *un; | |
2168 | struct digi_t tmp; | |
a44b508a | 2169 | unsigned long flags; |
0b99d589 LL |
2170 | |
2171 | if (!retinfo) | |
8f90ef80 | 2172 | return -EFAULT; |
0b99d589 LL |
2173 | |
2174 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2175 | return -EFAULT; |
0b99d589 LL |
2176 | |
2177 | un = tty->driver_data; | |
2178 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2179 | return -EFAULT; |
0b99d589 LL |
2180 | |
2181 | ch = un->un_ch; | |
2182 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2183 | return -EFAULT; |
0b99d589 LL |
2184 | |
2185 | memset(&tmp, 0, sizeof(tmp)); | |
2186 | ||
a44b508a | 2187 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2188 | memcpy(&tmp, &ch->ch_digi, sizeof(tmp)); |
a44b508a | 2189 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2190 | |
2191 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) | |
8f90ef80 | 2192 | return -EFAULT; |
0b99d589 | 2193 | |
8f90ef80 | 2194 | return 0; |
0b99d589 LL |
2195 | } |
2196 | ||
0b99d589 | 2197 | /* |
8b07d521 | 2198 | * dgnc_tty_digiseta() |
0b99d589 LL |
2199 | * |
2200 | * Ioctl to set the information for ditty. | |
2201 | * | |
2202 | * | |
2203 | * | |
2204 | */ | |
851f306d CM |
2205 | static int dgnc_tty_digiseta(struct tty_struct *tty, |
2206 | struct digi_t __user *new_info) | |
0b99d589 | 2207 | { |
03425f55 | 2208 | struct dgnc_board *bd; |
0b99d589 LL |
2209 | struct channel_t *ch; |
2210 | struct un_t *un; | |
2211 | struct digi_t new_digi; | |
a44b508a | 2212 | unsigned long flags; |
0b99d589 | 2213 | |
0b99d589 | 2214 | if (!tty || tty->magic != TTY_MAGIC) |
8f90ef80 | 2215 | return -EFAULT; |
0b99d589 LL |
2216 | |
2217 | un = tty->driver_data; | |
2218 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2219 | return -EFAULT; |
0b99d589 LL |
2220 | |
2221 | ch = un->un_ch; | |
2222 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2223 | return -EFAULT; |
0b99d589 LL |
2224 | |
2225 | bd = ch->ch_bd; | |
2226 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2227 | return -EFAULT; |
0b99d589 | 2228 | |
f1e51745 | 2229 | if (copy_from_user(&new_digi, new_info, sizeof(new_digi))) |
8f90ef80 | 2230 | return -EFAULT; |
0b99d589 | 2231 | |
a44b508a | 2232 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2233 | |
2234 | /* | |
2235 | * Handle transistions to and from RTS Toggle. | |
2236 | */ | |
851f306d CM |
2237 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2238 | (new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 | 2239 | ch->ch_mostat &= ~(UART_MCR_RTS); |
851f306d CM |
2240 | if ((ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2241 | !(new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 LL |
2242 | ch->ch_mostat |= (UART_MCR_RTS); |
2243 | ||
2244 | /* | |
2245 | * Handle transistions to and from DTR Toggle. | |
2246 | */ | |
851f306d CM |
2247 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2248 | (new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 | 2249 | ch->ch_mostat &= ~(UART_MCR_DTR); |
851f306d CM |
2250 | if ((ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2251 | !(new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 LL |
2252 | ch->ch_mostat |= (UART_MCR_DTR); |
2253 | ||
a07bf39a | 2254 | memcpy(&ch->ch_digi, &new_digi, sizeof(new_digi)); |
0b99d589 | 2255 | |
8b07d521 | 2256 | if (ch->ch_digi.digi_maxcps < 1) |
0b99d589 LL |
2257 | ch->ch_digi.digi_maxcps = 1; |
2258 | ||
8b07d521 | 2259 | if (ch->ch_digi.digi_maxcps > 10000) |
0b99d589 LL |
2260 | ch->ch_digi.digi_maxcps = 10000; |
2261 | ||
2262 | if (ch->ch_digi.digi_bufsize < 10) | |
2263 | ch->ch_digi.digi_bufsize = 10; | |
2264 | ||
2265 | if (ch->ch_digi.digi_maxchar < 1) | |
2266 | ch->ch_digi.digi_maxchar = 1; | |
2267 | ||
2268 | if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize) | |
2269 | ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize; | |
2270 | ||
2271 | if (ch->ch_digi.digi_onlen > DIGI_PLEN) | |
2272 | ch->ch_digi.digi_onlen = DIGI_PLEN; | |
2273 | ||
2274 | if (ch->ch_digi.digi_offlen > DIGI_PLEN) | |
2275 | ch->ch_digi.digi_offlen = DIGI_PLEN; | |
2276 | ||
2277 | ch->ch_bd->bd_ops->param(tty); | |
2278 | ||
a44b508a | 2279 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2280 | |
8f90ef80 | 2281 | return 0; |
0b99d589 LL |
2282 | } |
2283 | ||
0b99d589 LL |
2284 | /* |
2285 | * dgnc_set_termios() | |
2286 | */ | |
851f306d CM |
2287 | static void dgnc_tty_set_termios(struct tty_struct *tty, |
2288 | struct ktermios *old_termios) | |
0b99d589 | 2289 | { |
03425f55 | 2290 | struct dgnc_board *bd; |
0b99d589 LL |
2291 | struct channel_t *ch; |
2292 | struct un_t *un; | |
a44b508a | 2293 | unsigned long flags; |
0b99d589 LL |
2294 | |
2295 | if (!tty || tty->magic != TTY_MAGIC) | |
2296 | return; | |
2297 | ||
2298 | un = tty->driver_data; | |
2299 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2300 | return; | |
2301 | ||
2302 | ch = un->un_ch; | |
2303 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2304 | return; | |
2305 | ||
2306 | bd = ch->ch_bd; | |
2307 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2308 | return; | |
2309 | ||
a44b508a | 2310 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2311 | |
22e3de76 LL |
2312 | ch->ch_c_cflag = tty->termios.c_cflag; |
2313 | ch->ch_c_iflag = tty->termios.c_iflag; | |
2314 | ch->ch_c_oflag = tty->termios.c_oflag; | |
2315 | ch->ch_c_lflag = tty->termios.c_lflag; | |
2316 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
2317 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
2318 | |
2319 | ch->ch_bd->bd_ops->param(tty); | |
2320 | dgnc_carrier(ch); | |
2321 | ||
a44b508a | 2322 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2323 | } |
2324 | ||
0b99d589 LL |
2325 | static void dgnc_tty_throttle(struct tty_struct *tty) |
2326 | { | |
2327 | struct channel_t *ch; | |
2328 | struct un_t *un; | |
a44b508a | 2329 | unsigned long flags; |
0b99d589 LL |
2330 | |
2331 | if (!tty || tty->magic != TTY_MAGIC) | |
2332 | return; | |
2333 | ||
2334 | un = tty->driver_data; | |
2335 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2336 | return; | |
8b07d521 | 2337 | |
90d2a471 LL |
2338 | ch = un->un_ch; |
2339 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2340 | return; | |
0b99d589 | 2341 | |
a44b508a | 2342 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2343 | |
2344 | ch->ch_flags |= (CH_FORCED_STOPI); | |
2345 | ||
a44b508a | 2346 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2347 | } |
2348 | ||
0b99d589 LL |
2349 | static void dgnc_tty_unthrottle(struct tty_struct *tty) |
2350 | { | |
2351 | struct channel_t *ch; | |
2352 | struct un_t *un; | |
a44b508a | 2353 | unsigned long flags; |
0b99d589 LL |
2354 | |
2355 | if (!tty || tty->magic != TTY_MAGIC) | |
2356 | return; | |
2357 | ||
2358 | un = tty->driver_data; | |
2359 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2360 | return; | |
8b07d521 | 2361 | |
90d2a471 LL |
2362 | ch = un->un_ch; |
2363 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2364 | return; | |
0b99d589 | 2365 | |
a44b508a | 2366 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2367 | |
2368 | ch->ch_flags &= ~(CH_FORCED_STOPI); | |
2369 | ||
a44b508a | 2370 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2371 | } |
2372 | ||
0b99d589 LL |
2373 | static void dgnc_tty_start(struct tty_struct *tty) |
2374 | { | |
03425f55 | 2375 | struct dgnc_board *bd; |
0b99d589 LL |
2376 | struct channel_t *ch; |
2377 | struct un_t *un; | |
a44b508a | 2378 | unsigned long flags; |
0b99d589 LL |
2379 | |
2380 | if (!tty || tty->magic != TTY_MAGIC) | |
2381 | return; | |
2382 | ||
2383 | un = tty->driver_data; | |
2384 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2385 | return; | |
8b07d521 | 2386 | |
90d2a471 LL |
2387 | ch = un->un_ch; |
2388 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2389 | return; | |
0b99d589 LL |
2390 | |
2391 | bd = ch->ch_bd; | |
2392 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2393 | return; | |
2394 | ||
a44b508a | 2395 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2396 | |
2397 | ch->ch_flags &= ~(CH_FORCED_STOP); | |
2398 | ||
a44b508a | 2399 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2400 | } |
2401 | ||
0b99d589 LL |
2402 | static void dgnc_tty_stop(struct tty_struct *tty) |
2403 | { | |
03425f55 | 2404 | struct dgnc_board *bd; |
0b99d589 LL |
2405 | struct channel_t *ch; |
2406 | struct un_t *un; | |
a44b508a | 2407 | unsigned long flags; |
0b99d589 LL |
2408 | |
2409 | if (!tty || tty->magic != TTY_MAGIC) | |
2410 | return; | |
2411 | ||
2412 | un = tty->driver_data; | |
2413 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2414 | return; | |
8b07d521 | 2415 | |
90d2a471 LL |
2416 | ch = un->un_ch; |
2417 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2418 | return; | |
0b99d589 LL |
2419 | |
2420 | bd = ch->ch_bd; | |
2421 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2422 | return; | |
2423 | ||
a44b508a | 2424 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2425 | |
2426 | ch->ch_flags |= (CH_FORCED_STOP); | |
2427 | ||
a44b508a | 2428 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2429 | } |
2430 | ||
8b07d521 | 2431 | /* |
0b99d589 LL |
2432 | * dgnc_tty_flush_chars() |
2433 | * | |
2434 | * Flush the cook buffer | |
2435 | * | |
2436 | * Note to self, and any other poor souls who venture here: | |
2437 | * | |
2438 | * flush in this case DOES NOT mean dispose of the data. | |
2439 | * instead, it means "stop buffering and send it if you | |
2440 | * haven't already." Just guess how I figured that out... SRW 2-Jun-98 | |
2441 | * | |
2442 | * It is also always called in interrupt context - JAR 8-Sept-99 | |
2443 | */ | |
2444 | static void dgnc_tty_flush_chars(struct tty_struct *tty) | |
2445 | { | |
03425f55 | 2446 | struct dgnc_board *bd; |
0b99d589 LL |
2447 | struct channel_t *ch; |
2448 | struct un_t *un; | |
a44b508a | 2449 | unsigned long flags; |
0b99d589 LL |
2450 | |
2451 | if (!tty || tty->magic != TTY_MAGIC) | |
2452 | return; | |
2453 | ||
2454 | un = tty->driver_data; | |
2455 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2456 | return; | |
8b07d521 | 2457 | |
90d2a471 LL |
2458 | ch = un->un_ch; |
2459 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2460 | return; | |
0b99d589 LL |
2461 | |
2462 | bd = ch->ch_bd; | |
2463 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2464 | return; | |
2465 | ||
a44b508a | 2466 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2467 | |
2468 | /* Do something maybe here */ | |
2469 | ||
a44b508a | 2470 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2471 | } |
2472 | ||
0b99d589 LL |
2473 | /* |
2474 | * dgnc_tty_flush_buffer() | |
8b07d521 | 2475 | * |
0b99d589 LL |
2476 | * Flush Tx buffer (make in == out) |
2477 | */ | |
2478 | static void dgnc_tty_flush_buffer(struct tty_struct *tty) | |
2479 | { | |
2480 | struct channel_t *ch; | |
2481 | struct un_t *un; | |
a44b508a | 2482 | unsigned long flags; |
0b99d589 LL |
2483 | |
2484 | if (!tty || tty->magic != TTY_MAGIC) | |
2485 | return; | |
2486 | ||
2487 | un = tty->driver_data; | |
2488 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2489 | return; | |
8b07d521 | 2490 | |
90d2a471 LL |
2491 | ch = un->un_ch; |
2492 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2493 | return; | |
0b99d589 | 2494 | |
a44b508a | 2495 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2496 | |
2497 | ch->ch_flags &= ~CH_STOP; | |
2498 | ||
2499 | /* Flush our write queue */ | |
2500 | ch->ch_w_head = ch->ch_w_tail; | |
2501 | ||
2502 | /* Flush UARTs transmit FIFO */ | |
2503 | ch->ch_bd->bd_ops->flush_uart_write(ch); | |
2504 | ||
adcb56f9 RS |
2505 | if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) { |
2506 | ch->ch_tun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2507 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2508 | } | |
adcb56f9 RS |
2509 | if (ch->ch_pun.un_flags & (UN_LOW | UN_EMPTY)) { |
2510 | ch->ch_pun.un_flags &= ~(UN_LOW | UN_EMPTY); | |
0b99d589 LL |
2511 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2512 | } | |
2513 | ||
a44b508a | 2514 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2515 | } |
2516 | ||
0b99d589 LL |
2517 | /***************************************************************************** |
2518 | * | |
2519 | * The IOCTL function and all of its helpers | |
2520 | * | |
2521 | *****************************************************************************/ | |
8b07d521 | 2522 | |
0b99d589 LL |
2523 | /* |
2524 | * dgnc_tty_ioctl() | |
2525 | * | |
2526 | * The usual assortment of ioctl's | |
2527 | */ | |
a31cefa2 | 2528 | static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
e352d3f1 | 2529 | unsigned long arg) |
0b99d589 | 2530 | { |
03425f55 | 2531 | struct dgnc_board *bd; |
0b99d589 LL |
2532 | struct channel_t *ch; |
2533 | struct un_t *un; | |
2534 | int rc; | |
a44b508a | 2535 | unsigned long flags; |
6f418259 | 2536 | void __user *uarg = (void __user *)arg; |
0b99d589 LL |
2537 | |
2538 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2539 | return -ENODEV; |
0b99d589 LL |
2540 | |
2541 | un = tty->driver_data; | |
2542 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2543 | return -ENODEV; |
0b99d589 LL |
2544 | |
2545 | ch = un->un_ch; | |
2546 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2547 | return -ENODEV; |
0b99d589 LL |
2548 | |
2549 | bd = ch->ch_bd; | |
2550 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2551 | return -ENODEV; |
0b99d589 | 2552 | |
a44b508a | 2553 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2554 | |
2555 | if (un->un_open_count <= 0) { | |
a44b508a | 2556 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2557 | return -EIO; |
0b99d589 LL |
2558 | } |
2559 | ||
2560 | switch (cmd) { | |
0b99d589 LL |
2561 | /* Here are all the standard ioctl's that we MUST implement */ |
2562 | ||
2563 | case TCSBRK: | |
2564 | /* | |
8b07d521 | 2565 | * TCSBRK is SVID version: non-zero arg --> no break |
0b99d589 LL |
2566 | * this behaviour is exploited by tcdrain(). |
2567 | * | |
2568 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be | |
2569 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2570 | * in the middle: 0.375 seconds. | |
2571 | */ | |
2572 | rc = tty_check_change(tty); | |
a44b508a | 2573 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2574 | if (rc) |
8f90ef80 | 2575 | return rc; |
0b99d589 LL |
2576 | |
2577 | rc = ch->ch_bd->bd_ops->drain(tty, 0); | |
2578 | ||
f1e51745 | 2579 | if (rc) |
8f90ef80 | 2580 | return -EINTR; |
0b99d589 | 2581 | |
a44b508a | 2582 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2583 | |
3c4019d3 | 2584 | if (((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP)) |
0b99d589 | 2585 | ch->ch_bd->bd_ops->send_break(ch, 250); |
0b99d589 | 2586 | |
a44b508a | 2587 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2588 | |
8f90ef80 | 2589 | return 0; |
0b99d589 | 2590 | |
0b99d589 | 2591 | case TCSBRKP: |
90d2a471 | 2592 | /* support for POSIX tcsendbreak() |
0b99d589 LL |
2593 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be |
2594 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2595 | * in the middle: 0.375 seconds. | |
2596 | */ | |
2597 | rc = tty_check_change(tty); | |
a44b508a | 2598 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2599 | if (rc) |
8f90ef80 | 2600 | return rc; |
0b99d589 LL |
2601 | |
2602 | rc = ch->ch_bd->bd_ops->drain(tty, 0); | |
f1e51745 | 2603 | if (rc) |
8f90ef80 | 2604 | return -EINTR; |
0b99d589 | 2605 | |
a44b508a | 2606 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2607 | |
2608 | ch->ch_bd->bd_ops->send_break(ch, 250); | |
2609 | ||
a44b508a | 2610 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2611 | |
8f90ef80 | 2612 | return 0; |
0b99d589 LL |
2613 | |
2614 | case TIOCSBRK: | |
2615 | rc = tty_check_change(tty); | |
a44b508a | 2616 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2617 | if (rc) |
8f90ef80 | 2618 | return rc; |
0b99d589 LL |
2619 | |
2620 | rc = ch->ch_bd->bd_ops->drain(tty, 0); | |
f1e51745 | 2621 | if (rc) |
8f90ef80 | 2622 | return -EINTR; |
0b99d589 | 2623 | |
a44b508a | 2624 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2625 | |
2626 | ch->ch_bd->bd_ops->send_break(ch, 250); | |
2627 | ||
a44b508a | 2628 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2629 | |
8f90ef80 | 2630 | return 0; |
0b99d589 LL |
2631 | |
2632 | case TIOCCBRK: | |
2633 | /* Do Nothing */ | |
a44b508a | 2634 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2635 | return 0; |
2636 | ||
2637 | case TIOCGSOFTCAR: | |
2638 | ||
a44b508a | 2639 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2640 | |
851f306d | 2641 | rc = put_user(C_CLOCAL(tty) ? 1 : 0, |
6f418259 | 2642 | (unsigned long __user *)arg); |
8f90ef80 | 2643 | return rc; |
0b99d589 LL |
2644 | |
2645 | case TIOCSSOFTCAR: | |
2646 | ||
a44b508a | 2647 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2648 | rc = get_user(arg, (unsigned long __user *)arg); |
0b99d589 | 2649 | if (rc) |
8f90ef80 | 2650 | return rc; |
0b99d589 | 2651 | |
a44b508a | 2652 | spin_lock_irqsave(&ch->ch_lock, flags); |
851f306d CM |
2653 | tty->termios.c_cflag = ((tty->termios.c_cflag & ~CLOCAL) | |
2654 | (arg ? CLOCAL : 0)); | |
0b99d589 | 2655 | ch->ch_bd->bd_ops->param(tty); |
a44b508a | 2656 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2657 | |
8f90ef80 | 2658 | return 0; |
8b07d521 | 2659 | |
0b99d589 | 2660 | case TIOCMGET: |
a44b508a | 2661 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2662 | return dgnc_get_modem_info(ch, uarg); |
0b99d589 LL |
2663 | |
2664 | case TIOCMBIS: | |
2665 | case TIOCMBIC: | |
2666 | case TIOCMSET: | |
a44b508a | 2667 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2668 | return dgnc_set_modem_info(tty, cmd, uarg); |
0b99d589 LL |
2669 | |
2670 | /* | |
2671 | * Here are any additional ioctl's that we want to implement | |
2672 | */ | |
8b07d521 LL |
2673 | |
2674 | case TCFLSH: | |
0b99d589 LL |
2675 | /* |
2676 | * The linux tty driver doesn't have a flush | |
2677 | * input routine for the driver, assuming all backed | |
2678 | * up data is in the line disc. buffers. However, | |
2679 | * we all know that's not the case. Here, we | |
2680 | * act on the ioctl, but then lie and say we didn't | |
2681 | * so the line discipline will process the flush | |
2682 | * also. | |
8b07d521 | 2683 | */ |
0b99d589 LL |
2684 | rc = tty_check_change(tty); |
2685 | if (rc) { | |
a44b508a | 2686 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2687 | return rc; |
0b99d589 LL |
2688 | } |
2689 | ||
2690 | if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) { | |
2691 | ch->ch_r_head = ch->ch_r_tail; | |
2692 | ch->ch_bd->bd_ops->flush_uart_read(ch); | |
2693 | /* Force queue flow control to be released, if needed */ | |
2694 | dgnc_check_queue_flow_control(ch); | |
2695 | } | |
2696 | ||
2697 | if ((arg == TCOFLUSH) || (arg == TCIOFLUSH)) { | |
2698 | if (!(un->un_type == DGNC_PRINT)) { | |
2699 | ch->ch_w_head = ch->ch_w_tail; | |
2700 | ch->ch_bd->bd_ops->flush_uart_write(ch); | |
2701 | ||
2702 | if (ch->ch_tun.un_flags & (UN_LOW|UN_EMPTY)) { | |
851f306d | 2703 | ch->ch_tun.un_flags &= |
adcb56f9 | 2704 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2705 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2706 | } | |
2707 | ||
2708 | if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) { | |
851f306d | 2709 | ch->ch_pun.un_flags &= |
adcb56f9 | 2710 | ~(UN_LOW | UN_EMPTY); |
0b99d589 LL |
2711 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2712 | } | |
0b99d589 LL |
2713 | } |
2714 | } | |
2715 | ||
8b07d521 | 2716 | /* pretend we didn't recognize this IOCTL */ |
a44b508a | 2717 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2718 | return -ENOIOCTLCMD; |
0b99d589 LL |
2719 | case TCSETSF: |
2720 | case TCSETSW: | |
2721 | /* | |
2722 | * The linux tty driver doesn't have a flush | |
2723 | * input routine for the driver, assuming all backed | |
2724 | * up data is in the line disc. buffers. However, | |
2725 | * we all know that's not the case. Here, we | |
2726 | * act on the ioctl, but then lie and say we didn't | |
2727 | * so the line discipline will process the flush | |
2728 | * also. | |
2729 | */ | |
2730 | if (cmd == TCSETSF) { | |
2731 | /* flush rx */ | |
2732 | ch->ch_flags &= ~CH_STOP; | |
2733 | ch->ch_r_head = ch->ch_r_tail; | |
2734 | ch->ch_bd->bd_ops->flush_uart_read(ch); | |
2735 | /* Force queue flow control to be released, if needed */ | |
2736 | dgnc_check_queue_flow_control(ch); | |
2737 | } | |
2738 | ||
2739 | /* now wait for all the output to drain */ | |
a44b508a | 2740 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2741 | rc = ch->ch_bd->bd_ops->drain(tty, 0); |
f1e51745 | 2742 | if (rc) |
8f90ef80 | 2743 | return -EINTR; |
0b99d589 LL |
2744 | |
2745 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2746 | return -ENOIOCTLCMD; |
0b99d589 LL |
2747 | |
2748 | case TCSETAW: | |
2749 | ||
a44b508a | 2750 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2751 | rc = ch->ch_bd->bd_ops->drain(tty, 0); |
f1e51745 | 2752 | if (rc) |
8f90ef80 | 2753 | return -EINTR; |
0b99d589 LL |
2754 | |
2755 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2756 | return -ENOIOCTLCMD; |
0b99d589 LL |
2757 | |
2758 | case TCXONC: | |
a44b508a | 2759 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2760 | /* Make the ld do it */ |
8f90ef80 | 2761 | return -ENOIOCTLCMD; |
0b99d589 LL |
2762 | |
2763 | case DIGI_GETA: | |
2764 | /* get information for ditty */ | |
a44b508a | 2765 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2766 | return dgnc_tty_digigeta(tty, uarg); |
0b99d589 LL |
2767 | |
2768 | case DIGI_SETAW: | |
2769 | case DIGI_SETAF: | |
2770 | ||
2771 | /* set information for ditty */ | |
2772 | if (cmd == (DIGI_SETAW)) { | |
a44b508a | 2773 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2774 | rc = ch->ch_bd->bd_ops->drain(tty, 0); |
f1e51745 SL |
2775 | |
2776 | if (rc) | |
8f90ef80 | 2777 | return -EINTR; |
f1e51745 | 2778 | |
a44b508a | 2779 | spin_lock_irqsave(&ch->ch_lock, flags); |
2000c581 | 2780 | } else { |
0b99d589 LL |
2781 | tty_ldisc_flush(tty); |
2782 | } | |
2783 | /* fall thru */ | |
2784 | ||
2785 | case DIGI_SETA: | |
a44b508a | 2786 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2787 | return dgnc_tty_digiseta(tty, uarg); |
8b07d521 | 2788 | |
0b99d589 LL |
2789 | case DIGI_LOOPBACK: |
2790 | { | |
2791 | uint loopback = 0; | |
851f306d CM |
2792 | /* Let go of locks when accessing user space, |
2793 | * could sleep | |
2794 | */ | |
a44b508a | 2795 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2796 | rc = get_user(loopback, (unsigned int __user *)arg); |
0b99d589 | 2797 | if (rc) |
8f90ef80 | 2798 | return rc; |
a44b508a | 2799 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2800 | |
8b07d521 | 2801 | /* Enable/disable internal loopback for this port */ |
0b99d589 LL |
2802 | if (loopback) |
2803 | ch->ch_flags |= CH_LOOPBACK; | |
2804 | else | |
2805 | ch->ch_flags &= ~(CH_LOOPBACK); | |
2806 | ||
2807 | ch->ch_bd->bd_ops->param(tty); | |
a44b508a | 2808 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2809 | return 0; |
90d2a471 | 2810 | } |
0b99d589 LL |
2811 | |
2812 | case DIGI_GETCUSTOMBAUD: | |
a44b508a | 2813 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2814 | rc = put_user(ch->ch_custom_speed, (unsigned int __user *)arg); |
8f90ef80 | 2815 | return rc; |
0b99d589 LL |
2816 | |
2817 | case DIGI_SETCUSTOMBAUD: | |
2818 | { | |
93c76c9c | 2819 | int new_rate; |
0b99d589 | 2820 | /* Let go of locks when accessing user space, could sleep */ |
a44b508a | 2821 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2822 | rc = get_user(new_rate, (int __user *)arg); |
0b99d589 | 2823 | if (rc) |
8f90ef80 | 2824 | return rc; |
a44b508a | 2825 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2826 | dgnc_set_custom_speed(ch, new_rate); |
2827 | ch->ch_bd->bd_ops->param(tty); | |
a44b508a | 2828 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2829 | return 0; |
90d2a471 | 2830 | } |
0b99d589 LL |
2831 | |
2832 | /* | |
2833 | * This ioctl allows insertion of a character into the front | |
2834 | * of any pending data to be transmitted. | |
2835 | * | |
2836 | * This ioctl is to satify the "Send Character Immediate" | |
2837 | * call that the RealPort protocol spec requires. | |
2838 | */ | |
2839 | case DIGI_REALPORT_SENDIMMEDIATE: | |
2840 | { | |
2841 | unsigned char c; | |
0eaa02e6 | 2842 | |
a44b508a | 2843 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2844 | rc = get_user(c, (unsigned char __user *)arg); |
0b99d589 | 2845 | if (rc) |
8f90ef80 | 2846 | return rc; |
a44b508a | 2847 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2848 | ch->ch_bd->bd_ops->send_immediate_char(ch, c); |
a44b508a | 2849 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2850 | return 0; |
0b99d589 LL |
2851 | } |
2852 | ||
2853 | /* | |
2854 | * This ioctl returns all the current counts for the port. | |
2855 | * | |
2856 | * This ioctl is to satify the "Line Error Counters" | |
2857 | * call that the RealPort protocol spec requires. | |
2858 | */ | |
2859 | case DIGI_REALPORT_GETCOUNTERS: | |
2860 | { | |
2861 | struct digi_getcounter buf; | |
2862 | ||
2863 | buf.norun = ch->ch_err_overrun; | |
feba47a7 | 2864 | buf.noflow = 0; /* The driver doesn't keep this stat */ |
0b99d589 LL |
2865 | buf.nframe = ch->ch_err_frame; |
2866 | buf.nparity = ch->ch_err_parity; | |
2867 | buf.nbreak = ch->ch_err_break; | |
2868 | buf.rbytes = ch->ch_rxcount; | |
2869 | buf.tbytes = ch->ch_txcount; | |
2870 | ||
a44b508a | 2871 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2872 | |
50667c67 | 2873 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2874 | return -EFAULT; |
50667c67 | 2875 | |
8f90ef80 | 2876 | return 0; |
0b99d589 LL |
2877 | } |
2878 | ||
2879 | /* | |
2880 | * This ioctl returns all current events. | |
2881 | * | |
2882 | * This ioctl is to satify the "Event Reporting" | |
2883 | * call that the RealPort protocol spec requires. | |
90d2a471 | 2884 | */ |
0b99d589 LL |
2885 | case DIGI_REALPORT_GETEVENTS: |
2886 | { | |
2887 | unsigned int events = 0; | |
2888 | ||
2889 | /* NOTE: MORE EVENTS NEEDS TO BE ADDED HERE */ | |
2890 | if (ch->ch_flags & CH_BREAK_SENDING) | |
2891 | events |= EV_TXB; | |
851f306d CM |
2892 | if ((ch->ch_flags & CH_STOP) || |
2893 | (ch->ch_flags & CH_FORCED_STOP)) | |
0b99d589 | 2894 | events |= (EV_OPU | EV_OPS); |
50667c67 | 2895 | |
851f306d CM |
2896 | if ((ch->ch_flags & CH_STOPI) || |
2897 | (ch->ch_flags & CH_FORCED_STOPI)) | |
0b99d589 | 2898 | events |= (EV_IPU | EV_IPS); |
0b99d589 | 2899 | |
a44b508a | 2900 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2901 | rc = put_user(events, (unsigned int __user *)arg); |
8f90ef80 | 2902 | return rc; |
0b99d589 LL |
2903 | } |
2904 | ||
2905 | /* | |
2906 | * This ioctl returns TOUT and TIN counters based | |
2907 | * upon the values passed in by the RealPort Server. | |
2908 | * It also passes back whether the UART Transmitter is | |
2909 | * empty as well. | |
90d2a471 | 2910 | */ |
0b99d589 LL |
2911 | case DIGI_REALPORT_GETBUFFERS: |
2912 | { | |
2913 | struct digi_getbuffer buf; | |
2914 | int tdist; | |
2915 | int count; | |
2916 | ||
a44b508a | 2917 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2918 | |
2919 | /* | |
2920 | * Get data from user first. | |
2921 | */ | |
50667c67 | 2922 | if (copy_from_user(&buf, uarg, sizeof(buf))) |
8f90ef80 | 2923 | return -EFAULT; |
0b99d589 | 2924 | |
a44b508a | 2925 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2926 | |
2927 | /* | |
2928 | * Figure out how much data is in our RX and TX queues. | |
2929 | */ | |
2930 | buf.rxbuf = (ch->ch_r_head - ch->ch_r_tail) & RQUEUEMASK; | |
2931 | buf.txbuf = (ch->ch_w_head - ch->ch_w_tail) & WQUEUEMASK; | |
2932 | ||
2933 | /* | |
2934 | * Is the UART empty? Add that value to whats in our TX queue. | |
2935 | */ | |
2936 | count = buf.txbuf + ch->ch_bd->bd_ops->get_uart_bytes_left(ch); | |
2937 | ||
2938 | /* | |
2939 | * Figure out how much data the RealPort Server believes should | |
2940 | * be in our TX queue. | |
2941 | */ | |
2942 | tdist = (buf.tIn - buf.tOut) & 0xffff; | |
2943 | ||
2944 | /* | |
2945 | * If we have more data than the RealPort Server believes we | |
2946 | * should have, reduce our count to its amount. | |
2947 | * | |
2948 | * This count difference CAN happen because the Linux LD can | |
2949 | * insert more characters into our queue for OPOST processing | |
2950 | * that the RealPort Server doesn't know about. | |
2951 | */ | |
50667c67 | 2952 | if (buf.txbuf > tdist) |
0b99d589 | 2953 | buf.txbuf = tdist; |
0b99d589 LL |
2954 | |
2955 | /* | |
2956 | * Report whether our queue and UART TX are completely empty. | |
2957 | */ | |
50667c67 | 2958 | if (count) |
0b99d589 | 2959 | buf.txdone = 0; |
50667c67 | 2960 | else |
0b99d589 | 2961 | buf.txdone = 1; |
0b99d589 | 2962 | |
a44b508a | 2963 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2964 | |
50667c67 | 2965 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2966 | return -EFAULT; |
50667c67 | 2967 | |
8f90ef80 | 2968 | return 0; |
0b99d589 LL |
2969 | } |
2970 | default: | |
a44b508a | 2971 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2972 | |
8f90ef80 | 2973 | return -ENOIOCTLCMD; |
0b99d589 | 2974 | } |
0b99d589 | 2975 | } |