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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 LL |
367 | classp = tty_register_device(&brd->SerialDriver, i, |
368 | &(ch->ch_bd->pdev->dev)); | |
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, | |
373 | &(ch->ch_bd->pdev->dev)); | |
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 | ||
0b99d589 LL |
446 | /*======================================================================= |
447 | * | |
448 | * dgnc_wmove - Write data to transmit queue. | |
449 | * | |
450 | * ch - Pointer to channel structure. | |
451 | * buf - Poiter to characters to be moved. | |
452 | * n - Number of characters to move. | |
453 | * | |
454 | *=======================================================================*/ | |
455 | static void dgnc_wmove(struct channel_t *ch, char *buf, uint n) | |
456 | { | |
457 | int remain; | |
458 | uint head; | |
459 | ||
460 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
461 | return; | |
8b07d521 | 462 | |
0b99d589 LL |
463 | head = ch->ch_w_head & WQUEUEMASK; |
464 | ||
465 | /* | |
466 | * If the write wraps over the top of the circular buffer, | |
467 | * move the portion up to the wrap point, and reset the | |
468 | * pointers to the bottom. | |
469 | */ | |
470 | remain = WQUEUESIZE - head; | |
471 | ||
472 | if (n >= remain) { | |
8b07d521 | 473 | n -= remain; |
0b99d589 LL |
474 | memcpy(ch->ch_wqueue + head, buf, remain); |
475 | head = 0; | |
476 | buf += remain; | |
477 | } | |
478 | ||
479 | if (n > 0) { | |
480 | /* | |
481 | * Move rest of data. | |
482 | */ | |
483 | remain = n; | |
484 | memcpy(ch->ch_wqueue + head, buf, remain); | |
485 | head += remain; | |
486 | } | |
487 | ||
488 | head &= WQUEUEMASK; | |
489 | ch->ch_w_head = head; | |
490 | } | |
491 | ||
0b99d589 LL |
492 | /*======================================================================= |
493 | * | |
494 | * dgnc_input - Process received data. | |
8b07d521 | 495 | * |
90d2a471 | 496 | * ch - Pointer to channel structure. |
8b07d521 | 497 | * |
0b99d589 LL |
498 | *=======================================================================*/ |
499 | void dgnc_input(struct channel_t *ch) | |
500 | { | |
03425f55 | 501 | struct dgnc_board *bd; |
0b99d589 | 502 | struct tty_struct *tp; |
c84a083b | 503 | struct tty_ldisc *ld = NULL; |
0b99d589 LL |
504 | uint rmask; |
505 | ushort head; | |
506 | ushort tail; | |
507 | int data_len; | |
a44b508a | 508 | unsigned long flags; |
0b99d589 LL |
509 | int flip_len; |
510 | int len = 0; | |
511 | int n = 0; | |
0b99d589 LL |
512 | int s = 0; |
513 | int i = 0; | |
514 | ||
515 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
516 | return; | |
517 | ||
518 | tp = ch->ch_tun.un_tty; | |
519 | ||
520 | bd = ch->ch_bd; | |
a82477c3 | 521 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) |
0b99d589 LL |
522 | return; |
523 | ||
a44b508a | 524 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 525 | |
8b07d521 LL |
526 | /* |
527 | * Figure the number of characters in the buffer. | |
0b99d589 LL |
528 | * Exit immediately if none. |
529 | */ | |
530 | rmask = RQUEUEMASK; | |
531 | head = ch->ch_r_head & rmask; | |
532 | tail = ch->ch_r_tail & rmask; | |
533 | data_len = (head - tail) & rmask; | |
534 | ||
c84a083b QL |
535 | if (data_len == 0) |
536 | goto exit_unlock; | |
0b99d589 | 537 | |
0b99d589 LL |
538 | /* |
539 | * If the device is not open, or CREAD is off, | |
90d2a471 | 540 | * flush input data and return immediately. |
0b99d589 | 541 | */ |
851f306d CM |
542 | if (!tp || (tp->magic != TTY_MAGIC) || |
543 | !(ch->ch_tun.un_flags & UN_ISOPEN) || | |
544 | !(tp->termios.c_cflag & CREAD) || | |
545 | (ch->ch_tun.un_flags & UN_CLOSING)) { | |
0b99d589 LL |
546 | ch->ch_r_head = tail; |
547 | ||
548 | /* Force queue flow control to be released, if needed */ | |
549 | dgnc_check_queue_flow_control(ch); | |
550 | ||
c84a083b | 551 | goto exit_unlock; |
0b99d589 LL |
552 | } |
553 | ||
554 | /* | |
555 | * If we are throttled, simply don't read any data. | |
556 | */ | |
c84a083b QL |
557 | if (ch->ch_flags & CH_FORCED_STOPI) |
558 | goto exit_unlock; | |
0b99d589 | 559 | |
100013fa | 560 | flip_len = TTY_FLIPBUF_SIZE; |
0b99d589 LL |
561 | |
562 | /* Chop down the length, if needed */ | |
563 | len = min(data_len, flip_len); | |
100013fa | 564 | len = min(len, (N_TTY_BUF_SIZE - 1)); |
0b99d589 LL |
565 | |
566 | ld = tty_ldisc_ref(tp); | |
567 | ||
0b99d589 LL |
568 | /* |
569 | * If we were unable to get a reference to the ld, | |
570 | * don't flush our buffer, and act like the ld doesn't | |
571 | * have any space to put the data right now. | |
572 | */ | |
573 | if (!ld) { | |
574 | len = 0; | |
575 | } else { | |
576 | /* | |
577 | * If ld doesn't have a pointer to a receive_buf function, | |
578 | * flush the data, then act like the ld doesn't have any | |
579 | * space to put the data right now. | |
580 | */ | |
581 | if (!ld->ops->receive_buf) { | |
582 | ch->ch_r_head = ch->ch_r_tail; | |
583 | len = 0; | |
8b07d521 | 584 | } |
0b99d589 LL |
585 | } |
586 | ||
c84a083b QL |
587 | if (len <= 0) |
588 | goto exit_unlock; | |
0b99d589 LL |
589 | |
590 | /* | |
591 | * The tty layer in the kernel has changed in 2.6.16+. | |
592 | * | |
593 | * The flip buffers in the tty structure are no longer exposed, | |
594 | * and probably will be going away eventually. | |
8b07d521 | 595 | * |
0b99d589 LL |
596 | * If we are completely raw, we don't need to go through a lot |
597 | * of the tty layers that exist. | |
598 | * In this case, we take the shortest and fastest route we | |
599 | * can to relay the data to the user. | |
600 | * | |
601 | * On the other hand, if we are not raw, we need to go through | |
602 | * the new 2.6.16+ tty layer, which has its API more well defined. | |
603 | */ | |
100013fa LL |
604 | len = tty_buffer_request_room(tp->port, len); |
605 | n = len; | |
0b99d589 | 606 | |
100013fa LL |
607 | /* |
608 | * n now contains the most amount of data we can copy, | |
609 | * bounded either by how much the Linux tty layer can handle, | |
610 | * or the amount of data the card actually has pending... | |
611 | */ | |
612 | while (n) { | |
613 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; | |
614 | s = min(s, n); | |
0b99d589 | 615 | |
100013fa LL |
616 | if (s <= 0) |
617 | break; | |
0b99d589 LL |
618 | |
619 | /* | |
8b07d521 | 620 | * If conditions are such that ld needs to see all |
100013fa LL |
621 | * UART errors, we will have to walk each character |
622 | * and error byte and send them to the buffer one at | |
623 | * a time. | |
0b99d589 | 624 | */ |
100013fa LL |
625 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
626 | for (i = 0; i < s; i++) { | |
627 | if (*(ch->ch_equeue + tail + i) & UART_LSR_BI) | |
851f306d CM |
628 | tty_insert_flip_char(tp->port, |
629 | *(ch->ch_rqueue + tail + i), | |
630 | TTY_BREAK); | |
631 | else if (*(ch->ch_equeue + tail + i) & | |
632 | UART_LSR_PE) | |
633 | tty_insert_flip_char(tp->port, | |
634 | *(ch->ch_rqueue + tail + i), | |
635 | TTY_PARITY); | |
636 | else if (*(ch->ch_equeue + tail + i) & | |
637 | UART_LSR_FE) | |
638 | tty_insert_flip_char(tp->port, | |
639 | *(ch->ch_rqueue + tail + i), | |
640 | TTY_FRAME); | |
100013fa | 641 | else |
851f306d CM |
642 | tty_insert_flip_char(tp->port, |
643 | *(ch->ch_rqueue + tail + i), | |
644 | TTY_NORMAL); | |
100013fa | 645 | } |
2000c581 | 646 | } else { |
851f306d CM |
647 | tty_insert_flip_string(tp->port, |
648 | ch->ch_rqueue + tail, | |
649 | s); | |
0b99d589 LL |
650 | } |
651 | ||
100013fa LL |
652 | tail += s; |
653 | n -= s; | |
654 | /* Flip queue if needed */ | |
655 | tail &= rmask; | |
0b99d589 | 656 | } |
0b99d589 | 657 | |
100013fa LL |
658 | ch->ch_r_tail = tail & rmask; |
659 | ch->ch_e_tail = tail & rmask; | |
660 | dgnc_check_queue_flow_control(ch); | |
a44b508a | 661 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 662 | |
100013fa LL |
663 | /* Tell the tty layer its okay to "eat" the data now */ |
664 | tty_flip_buffer_push(tp->port); | |
0b99d589 LL |
665 | |
666 | if (ld) | |
667 | tty_ldisc_deref(ld); | |
c84a083b QL |
668 | return; |
669 | ||
670 | exit_unlock: | |
5ec29365 | 671 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
c84a083b QL |
672 | if (ld) |
673 | tty_ldisc_deref(ld); | |
0b99d589 LL |
674 | } |
675 | ||
8b07d521 | 676 | /************************************************************************ |
0b99d589 | 677 | * Determines when CARRIER changes state and takes appropriate |
8b07d521 | 678 | * action. |
0b99d589 LL |
679 | ************************************************************************/ |
680 | void dgnc_carrier(struct channel_t *ch) | |
681 | { | |
03425f55 | 682 | struct dgnc_board *bd; |
0b99d589 | 683 | |
90d2a471 LL |
684 | int virt_carrier = 0; |
685 | int phys_carrier = 0; | |
8b07d521 | 686 | |
0b99d589 LL |
687 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
688 | return; | |
689 | ||
690 | bd = ch->ch_bd; | |
691 | ||
692 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
693 | return; | |
694 | ||
f1e51745 | 695 | if (ch->ch_mistat & UART_MSR_DCD) |
0b99d589 | 696 | phys_carrier = 1; |
0b99d589 | 697 | |
50667c67 | 698 | if (ch->ch_digi.digi_flags & DIGI_FORCEDCD) |
0b99d589 | 699 | virt_carrier = 1; |
0b99d589 | 700 | |
50667c67 | 701 | if (ch->ch_c_cflag & CLOCAL) |
0b99d589 | 702 | virt_carrier = 1; |
0b99d589 | 703 | |
0b99d589 LL |
704 | /* |
705 | * Test for a VIRTUAL carrier transition to HIGH. | |
706 | */ | |
707 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { | |
0b99d589 LL |
708 | /* |
709 | * When carrier rises, wake any threads waiting | |
710 | * for carrier in the open routine. | |
711 | */ | |
712 | ||
0b99d589 LL |
713 | if (waitqueue_active(&(ch->ch_flags_wait))) |
714 | wake_up_interruptible(&ch->ch_flags_wait); | |
715 | } | |
716 | ||
717 | /* | |
718 | * Test for a PHYSICAL carrier transition to HIGH. | |
719 | */ | |
720 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { | |
0b99d589 LL |
721 | /* |
722 | * When carrier rises, wake any threads waiting | |
723 | * for carrier in the open routine. | |
724 | */ | |
725 | ||
0b99d589 LL |
726 | if (waitqueue_active(&(ch->ch_flags_wait))) |
727 | wake_up_interruptible(&ch->ch_flags_wait); | |
728 | } | |
729 | ||
730 | /* | |
731 | * Test for a PHYSICAL transition to low, so long as we aren't | |
732 | * currently ignoring physical transitions (which is what "virtual | |
733 | * carrier" indicates). | |
734 | * | |
735 | * The transition of the virtual carrier to low really doesn't | |
736 | * matter... it really only means "ignore carrier state", not | |
737 | * "make pretend that carrier is there". | |
738 | */ | |
739 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) && | |
10352c2a | 740 | (phys_carrier == 0)) { |
0b99d589 LL |
741 | /* |
742 | * When carrier drops: | |
743 | * | |
744 | * Drop carrier on all open units. | |
745 | * | |
746 | * Flush queues, waking up any task waiting in the | |
747 | * line discipline. | |
748 | * | |
749 | * Send a hangup to the control terminal. | |
750 | * | |
751 | * Enable all select calls. | |
752 | */ | |
753 | if (waitqueue_active(&(ch->ch_flags_wait))) | |
754 | wake_up_interruptible(&ch->ch_flags_wait); | |
755 | ||
f1e51745 | 756 | if (ch->ch_tun.un_open_count > 0) |
0b99d589 | 757 | tty_hangup(ch->ch_tun.un_tty); |
0b99d589 | 758 | |
f1e51745 | 759 | if (ch->ch_pun.un_open_count > 0) |
0b99d589 | 760 | tty_hangup(ch->ch_pun.un_tty); |
0b99d589 LL |
761 | } |
762 | ||
763 | /* | |
764 | * Make sure that our cached values reflect the current reality. | |
765 | */ | |
766 | if (virt_carrier == 1) | |
767 | ch->ch_flags |= CH_FCAR; | |
8b07d521 | 768 | else |
0b99d589 LL |
769 | ch->ch_flags &= ~CH_FCAR; |
770 | ||
771 | if (phys_carrier == 1) | |
772 | ch->ch_flags |= CH_CD; | |
773 | else | |
774 | ch->ch_flags &= ~CH_CD; | |
775 | } | |
776 | ||
777 | /* | |
778 | * Assign the custom baud rate to the channel structure | |
779 | */ | |
780 | static void dgnc_set_custom_speed(struct channel_t *ch, uint newrate) | |
781 | { | |
782 | int testdiv; | |
783 | int testrate_high; | |
8b07d521 | 784 | int testrate_low; |
0b99d589 LL |
785 | int deltahigh; |
786 | int deltalow; | |
787 | ||
93c76c9c DY |
788 | if (newrate <= 0) { |
789 | ch->ch_custom_speed = 0; | |
790 | return; | |
791 | } | |
0b99d589 LL |
792 | |
793 | /* | |
794 | * Since the divisor is stored in a 16-bit integer, we make sure | |
795 | * we don't allow any rates smaller than a 16-bit integer would allow. | |
796 | * And of course, rates above the dividend won't fly. | |
797 | */ | |
798 | if (newrate && newrate < ((ch->ch_bd->bd_dividend / 0xFFFF) + 1)) | |
799 | newrate = ((ch->ch_bd->bd_dividend / 0xFFFF) + 1); | |
800 | ||
801 | if (newrate && newrate > ch->ch_bd->bd_dividend) | |
90d2a471 | 802 | newrate = ch->ch_bd->bd_dividend; |
0b99d589 | 803 | |
93c76c9c | 804 | if (newrate > 0) { |
0b99d589 LL |
805 | testdiv = ch->ch_bd->bd_dividend / newrate; |
806 | ||
807 | /* | |
808 | * If we try to figure out what rate the board would use | |
809 | * with the test divisor, it will be either equal or higher | |
810 | * than the requested baud rate. If we then determine the | |
8b07d521 | 811 | * rate with a divisor one higher, we will get the next lower |
0b99d589 LL |
812 | * supported rate below the requested. |
813 | */ | |
814 | testrate_high = ch->ch_bd->bd_dividend / testdiv; | |
815 | testrate_low = ch->ch_bd->bd_dividend / (testdiv + 1); | |
816 | ||
817 | /* | |
818 | * If the rate for the requested divisor is correct, just | |
819 | * use it and be done. | |
820 | */ | |
93c76c9c DY |
821 | if (testrate_high != newrate) { |
822 | /* | |
851f306d CM |
823 | * Otherwise, pick the rate that is closer |
824 | * (i.e. whichever rate has a smaller delta). | |
93c76c9c DY |
825 | */ |
826 | deltahigh = testrate_high - newrate; | |
827 | deltalow = newrate - testrate_low; | |
0b99d589 | 828 | |
50667c67 | 829 | if (deltahigh < deltalow) |
93c76c9c | 830 | newrate = testrate_high; |
50667c67 | 831 | else |
93c76c9c | 832 | newrate = testrate_low; |
0b99d589 | 833 | } |
0b99d589 | 834 | } |
8b07d521 | 835 | |
0b99d589 | 836 | ch->ch_custom_speed = newrate; |
0b99d589 LL |
837 | } |
838 | ||
0b99d589 LL |
839 | void dgnc_check_queue_flow_control(struct channel_t *ch) |
840 | { | |
841 | int qleft = 0; | |
842 | ||
843 | /* Store how much space we have left in the queue */ | |
f7c851d4 CP |
844 | qleft = ch->ch_r_tail - ch->ch_r_head - 1; |
845 | if (qleft < 0) | |
0b99d589 LL |
846 | qleft += RQUEUEMASK + 1; |
847 | ||
848 | /* | |
849 | * Check to see if we should enforce flow control on our queue because | |
850 | * the ld (or user) isn't reading data out of our queue fast enuf. | |
851 | * | |
852 | * NOTE: This is done based on what the current flow control of the | |
853 | * port is set for. | |
854 | * | |
855 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. | |
856 | * This will cause the UART's FIFO to back up, and force | |
857 | * the RTS signal to be dropped. | |
858 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to | |
859 | * the other side, in hopes it will stop sending data to us. | |
860 | * 3) NONE - Nothing we can do. We will simply drop any extra data | |
861 | * that gets sent into us when the queue fills up. | |
862 | */ | |
863 | if (qleft < 256) { | |
864 | /* HWFLOW */ | |
851f306d CM |
865 | if (ch->ch_digi.digi_flags & CTSPACE || |
866 | ch->ch_c_cflag & CRTSCTS) { | |
a82477c3 | 867 | if (!(ch->ch_flags & CH_RECEIVER_OFF)) { |
0b99d589 LL |
868 | ch->ch_bd->bd_ops->disable_receiver(ch); |
869 | ch->ch_flags |= (CH_RECEIVER_OFF); | |
0b99d589 LL |
870 | } |
871 | } | |
872 | /* SWFLOW */ | |
873 | else if (ch->ch_c_iflag & IXOFF) { | |
874 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { | |
875 | ch->ch_bd->bd_ops->send_stop_character(ch); | |
876 | ch->ch_stops_sent++; | |
0b99d589 LL |
877 | } |
878 | } | |
0b99d589 LL |
879 | } |
880 | ||
881 | /* | |
882 | * Check to see if we should unenforce flow control because | |
883 | * ld (or user) finally read enuf data out of our queue. | |
884 | * | |
885 | * NOTE: This is done based on what the current flow control of the | |
886 | * port is set for. | |
887 | * | |
888 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. | |
889 | * This will cause the UART's FIFO to raise RTS back up, | |
890 | * which will allow the other side to start sending data again. | |
891 | * 2) SWFLOW (IXOFF) - Send a start character to | |
892 | * the other side, so it will start sending data to us again. | |
893 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the | |
894 | * other side, we don't need to do anything now. | |
895 | */ | |
896 | if (qleft > (RQUEUESIZE / 2)) { | |
897 | /* HWFLOW */ | |
851f306d CM |
898 | if (ch->ch_digi.digi_flags & RTSPACE || |
899 | ch->ch_c_cflag & CRTSCTS) { | |
0b99d589 LL |
900 | if (ch->ch_flags & CH_RECEIVER_OFF) { |
901 | ch->ch_bd->bd_ops->enable_receiver(ch); | |
902 | ch->ch_flags &= ~(CH_RECEIVER_OFF); | |
0b99d589 LL |
903 | } |
904 | } | |
905 | /* SWFLOW */ | |
906 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { | |
907 | ch->ch_stops_sent = 0; | |
908 | ch->ch_bd->bd_ops->send_start_character(ch); | |
0b99d589 | 909 | } |
0b99d589 LL |
910 | } |
911 | } | |
912 | ||
0b99d589 LL |
913 | void dgnc_wakeup_writes(struct channel_t *ch) |
914 | { | |
915 | int qlen = 0; | |
a44b508a | 916 | unsigned long flags; |
0b99d589 LL |
917 | |
918 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
919 | return; | |
920 | ||
a44b508a | 921 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
922 | |
923 | /* | |
924 | * If channel now has space, wake up anyone waiting on the condition. | |
925 | */ | |
f7c851d4 CP |
926 | qlen = ch->ch_w_head - ch->ch_w_tail; |
927 | if (qlen < 0) | |
90d2a471 | 928 | qlen += WQUEUESIZE; |
0b99d589 LL |
929 | |
930 | if (qlen >= (WQUEUESIZE - 256)) { | |
a44b508a | 931 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
932 | return; |
933 | } | |
934 | ||
935 | if (ch->ch_tun.un_flags & UN_ISOPEN) { | |
90d2a471 | 936 | if ((ch->ch_tun.un_tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && |
10352c2a | 937 | ch->ch_tun.un_tty->ldisc->ops->write_wakeup) { |
a44b508a | 938 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
90d2a471 | 939 | (ch->ch_tun.un_tty->ldisc->ops->write_wakeup)(ch->ch_tun.un_tty); |
a44b508a | 940 | spin_lock_irqsave(&ch->ch_lock, flags); |
90d2a471 | 941 | } |
0b99d589 LL |
942 | |
943 | wake_up_interruptible(&ch->ch_tun.un_tty->write_wait); | |
944 | ||
945 | /* | |
946 | * If unit is set to wait until empty, check to make sure | |
947 | * the queue AND FIFO are both empty. | |
948 | */ | |
949 | if (ch->ch_tun.un_flags & UN_EMPTY) { | |
851f306d CM |
950 | if ((qlen == 0) && |
951 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) { | |
0b99d589 LL |
952 | ch->ch_tun.un_flags &= ~(UN_EMPTY); |
953 | ||
954 | /* | |
955 | * If RTS Toggle mode is on, whenever | |
956 | * the queue and UART is empty, keep RTS low. | |
957 | */ | |
958 | if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) { | |
959 | ch->ch_mostat &= ~(UART_MCR_RTS); | |
960 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
961 | } | |
962 | ||
963 | /* | |
964 | * If DTR Toggle mode is on, whenever | |
965 | * the queue and UART is empty, keep DTR low. | |
966 | */ | |
967 | if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) { | |
968 | ch->ch_mostat &= ~(UART_MCR_DTR); | |
969 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
970 | } | |
971 | } | |
972 | } | |
973 | ||
974 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); | |
975 | } | |
976 | ||
977 | if (ch->ch_pun.un_flags & UN_ISOPEN) { | |
90d2a471 | 978 | if ((ch->ch_pun.un_tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && |
10352c2a | 979 | ch->ch_pun.un_tty->ldisc->ops->write_wakeup) { |
a44b508a | 980 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
90d2a471 | 981 | (ch->ch_pun.un_tty->ldisc->ops->write_wakeup)(ch->ch_pun.un_tty); |
a44b508a | 982 | spin_lock_irqsave(&ch->ch_lock, flags); |
90d2a471 | 983 | } |
0b99d589 LL |
984 | |
985 | wake_up_interruptible(&ch->ch_pun.un_tty->write_wait); | |
986 | ||
987 | /* | |
988 | * If unit is set to wait until empty, check to make sure | |
989 | * the queue AND FIFO are both empty. | |
990 | */ | |
991 | if (ch->ch_pun.un_flags & UN_EMPTY) { | |
851f306d CM |
992 | if ((qlen == 0) && |
993 | (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) | |
0b99d589 | 994 | ch->ch_pun.un_flags &= ~(UN_EMPTY); |
0b99d589 LL |
995 | } |
996 | ||
997 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); | |
998 | } | |
999 | ||
a44b508a | 1000 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1001 | } |
1002 | ||
0b99d589 | 1003 | /************************************************************************ |
8b07d521 | 1004 | * |
0b99d589 | 1005 | * TTY Entry points and helper functions |
8b07d521 | 1006 | * |
0b99d589 LL |
1007 | ************************************************************************/ |
1008 | ||
1009 | /* | |
1010 | * dgnc_tty_open() | |
1011 | * | |
1012 | */ | |
1013 | static int dgnc_tty_open(struct tty_struct *tty, struct file *file) | |
1014 | { | |
03425f55 | 1015 | struct dgnc_board *brd; |
0b99d589 LL |
1016 | struct channel_t *ch; |
1017 | struct un_t *un; | |
1018 | uint major = 0; | |
1019 | uint minor = 0; | |
1020 | int rc = 0; | |
a44b508a | 1021 | unsigned long flags; |
0b99d589 LL |
1022 | |
1023 | rc = 0; | |
1024 | ||
1025 | major = MAJOR(tty_devnum(tty)); | |
1026 | minor = MINOR(tty_devnum(tty)); | |
1027 | ||
50667c67 | 1028 | if (major > 255) |
0b99d589 | 1029 | return -ENXIO; |
0b99d589 LL |
1030 | |
1031 | /* Get board pointer from our array of majors we have allocated */ | |
1032 | brd = dgnc_BoardsByMajor[major]; | |
50667c67 | 1033 | if (!brd) |
0b99d589 | 1034 | return -ENXIO; |
0b99d589 LL |
1035 | |
1036 | /* | |
1037 | * If board is not yet up to a state of READY, go to | |
1038 | * sleep waiting for it to happen or they cancel the open. | |
1039 | */ | |
1040 | rc = wait_event_interruptible(brd->state_wait, | |
1041 | (brd->state & BOARD_READY)); | |
1042 | ||
50667c67 | 1043 | if (rc) |
0b99d589 | 1044 | return rc; |
0b99d589 | 1045 | |
a44b508a | 1046 | spin_lock_irqsave(&brd->bd_lock, flags); |
0b99d589 LL |
1047 | |
1048 | /* If opened device is greater than our number of ports, bail. */ | |
4bef52f3 | 1049 | if (PORT_NUM(minor) >= brd->nasync) { |
a44b508a | 1050 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1051 | return -ENXIO; |
1052 | } | |
1053 | ||
1054 | ch = brd->channels[PORT_NUM(minor)]; | |
1055 | if (!ch) { | |
a44b508a | 1056 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1057 | return -ENXIO; |
1058 | } | |
1059 | ||
1060 | /* Drop board lock */ | |
a44b508a | 1061 | spin_unlock_irqrestore(&brd->bd_lock, flags); |
0b99d589 LL |
1062 | |
1063 | /* Grab channel lock */ | |
a44b508a | 1064 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1065 | |
1066 | /* Figure out our type */ | |
1067 | if (!IS_PRINT(minor)) { | |
1068 | un = &brd->channels[PORT_NUM(minor)]->ch_tun; | |
1069 | un->un_type = DGNC_SERIAL; | |
2000c581 | 1070 | } else if (IS_PRINT(minor)) { |
0b99d589 LL |
1071 | un = &brd->channels[PORT_NUM(minor)]->ch_pun; |
1072 | un->un_type = DGNC_PRINT; | |
2000c581 | 1073 | } else { |
a44b508a | 1074 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1075 | return -ENXIO; |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * If the port is still in a previous open, and in a state | |
1080 | * where we simply cannot safely keep going, wait until the | |
1081 | * state clears. | |
1082 | */ | |
a44b508a | 1083 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1084 | |
851f306d CM |
1085 | rc = wait_event_interruptible(ch->ch_flags_wait, |
1086 | ((ch->ch_flags & CH_OPENING) == 0)); | |
0b99d589 LL |
1087 | |
1088 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 1089 | if (rc) |
0b99d589 | 1090 | return -EINTR; |
0b99d589 LL |
1091 | |
1092 | /* | |
1093 | * If either unit is in the middle of the fragile part of close, | |
1094 | * we just cannot touch the channel safely. | |
1095 | * Go to sleep, knowing that when the channel can be | |
1096 | * touched safely, the close routine will signal the | |
1097 | * ch_flags_wait to wake us back up. | |
1098 | */ | |
1099 | rc = wait_event_interruptible(ch->ch_flags_wait, | |
851f306d CM |
1100 | (((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & |
1101 | UN_CLOSING) == 0)); | |
0b99d589 LL |
1102 | |
1103 | /* If ret is non-zero, user ctrl-c'ed us */ | |
f1e51745 | 1104 | if (rc) |
0b99d589 | 1105 | return -EINTR; |
0b99d589 | 1106 | |
a44b508a | 1107 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1108 | |
0b99d589 LL |
1109 | /* Store our unit into driver_data, so we always have it available. */ |
1110 | tty->driver_data = un; | |
1111 | ||
0b99d589 LL |
1112 | /* |
1113 | * Initialize tty's | |
1114 | */ | |
1115 | if (!(un->un_flags & UN_ISOPEN)) { | |
1116 | /* Store important variables. */ | |
1117 | un->un_tty = tty; | |
1118 | ||
1119 | /* Maybe do something here to the TTY struct as well? */ | |
1120 | } | |
1121 | ||
0b99d589 LL |
1122 | /* |
1123 | * Allocate channel buffers for read/write/error. | |
1124 | * Set flag, so we don't get trounced on. | |
1125 | */ | |
1126 | ch->ch_flags |= (CH_OPENING); | |
1127 | ||
1128 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ | |
a44b508a | 1129 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1130 | |
1131 | if (!ch->ch_rqueue) | |
52f9d668 | 1132 | ch->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1133 | if (!ch->ch_equeue) |
52f9d668 | 1134 | ch->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1135 | if (!ch->ch_wqueue) |
52f9d668 | 1136 | ch->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
0b99d589 | 1137 | |
a44b508a | 1138 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1139 | |
1140 | ch->ch_flags &= ~(CH_OPENING); | |
1141 | wake_up_interruptible(&ch->ch_flags_wait); | |
1142 | ||
1143 | /* | |
1144 | * Initialize if neither terminal or printer is open. | |
1145 | */ | |
1146 | if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_ISOPEN)) { | |
0b99d589 LL |
1147 | /* |
1148 | * Flush input queues. | |
1149 | */ | |
587abd7b SL |
1150 | ch->ch_r_head = 0; |
1151 | ch->ch_r_tail = 0; | |
1152 | ch->ch_e_head = 0; | |
1153 | ch->ch_e_tail = 0; | |
1154 | ch->ch_w_head = 0; | |
1155 | ch->ch_w_tail = 0; | |
0b99d589 LL |
1156 | |
1157 | brd->bd_ops->flush_uart_write(ch); | |
1158 | brd->bd_ops->flush_uart_read(ch); | |
1159 | ||
1160 | ch->ch_flags = 0; | |
1161 | ch->ch_cached_lsr = 0; | |
1162 | ch->ch_stop_sending_break = 0; | |
1163 | ch->ch_stops_sent = 0; | |
1164 | ||
22e3de76 LL |
1165 | ch->ch_c_cflag = tty->termios.c_cflag; |
1166 | ch->ch_c_iflag = tty->termios.c_iflag; | |
1167 | ch->ch_c_oflag = tty->termios.c_oflag; | |
1168 | ch->ch_c_lflag = tty->termios.c_lflag; | |
1169 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
1170 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
1171 | |
1172 | /* | |
1173 | * Bring up RTS and DTR... | |
1174 | * Also handle RTS or DTR toggle if set. | |
1175 | */ | |
1176 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
1177 | ch->ch_mostat |= (UART_MCR_RTS); | |
1178 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
1179 | ch->ch_mostat |= (UART_MCR_DTR); | |
1180 | ||
1181 | /* Tell UART to init itself */ | |
1182 | brd->bd_ops->uart_init(ch); | |
1183 | } | |
1184 | ||
1185 | /* | |
1186 | * Run param in case we changed anything | |
1187 | */ | |
1188 | brd->bd_ops->param(tty); | |
1189 | ||
1190 | dgnc_carrier(ch); | |
1191 | ||
8b07d521 | 1192 | /* |
0b99d589 LL |
1193 | * follow protocol for opening port |
1194 | */ | |
1195 | ||
a44b508a | 1196 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1197 | |
1198 | rc = dgnc_block_til_ready(tty, file, ch); | |
1199 | ||
0b99d589 | 1200 | /* No going back now, increment our unit and channel counters */ |
a44b508a | 1201 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1202 | ch->ch_open_count++; |
1203 | un->un_open_count++; | |
1204 | un->un_flags |= (UN_ISOPEN); | |
a44b508a | 1205 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1206 | |
8f90ef80 | 1207 | return rc; |
0b99d589 LL |
1208 | } |
1209 | ||
8b07d521 | 1210 | /* |
0b99d589 LL |
1211 | * dgnc_block_til_ready() |
1212 | * | |
1213 | * Wait for DCD, if needed. | |
1214 | */ | |
851f306d CM |
1215 | static int dgnc_block_til_ready(struct tty_struct *tty, |
1216 | struct file *file, | |
1217 | struct channel_t *ch) | |
8b07d521 | 1218 | { |
0b99d589 LL |
1219 | int retval = 0; |
1220 | struct un_t *un = NULL; | |
a44b508a | 1221 | unsigned long flags; |
0b99d589 LL |
1222 | uint old_flags = 0; |
1223 | int sleep_on_un_flags = 0; | |
1224 | ||
851f306d CM |
1225 | if (!tty || tty->magic != TTY_MAGIC || !file || !ch || |
1226 | ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1227 | return -ENXIO; |
0b99d589 LL |
1228 | |
1229 | un = tty->driver_data; | |
50667c67 | 1230 | if (!un || un->magic != DGNC_UNIT_MAGIC) |
8f90ef80 | 1231 | return -ENXIO; |
0b99d589 | 1232 | |
a44b508a | 1233 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1234 | |
1235 | ch->ch_wopen++; | |
1236 | ||
1237 | /* Loop forever */ | |
1238 | while (1) { | |
0b99d589 LL |
1239 | sleep_on_un_flags = 0; |
1240 | ||
1241 | /* | |
851f306d CM |
1242 | * If board has failed somehow during our sleep, |
1243 | * bail with error. | |
0b99d589 LL |
1244 | */ |
1245 | if (ch->ch_bd->state == BOARD_FAILED) { | |
1246 | retval = -ENXIO; | |
1247 | break; | |
1248 | } | |
1249 | ||
1250 | /* If tty was hung up, break out of loop and set error. */ | |
1251 | if (tty_hung_up_p(file)) { | |
1252 | retval = -EAGAIN; | |
1253 | break; | |
1254 | } | |
1255 | ||
1256 | /* | |
1257 | * If either unit is in the middle of the fragile part of close, | |
1258 | * we just cannot touch the channel safely. | |
1259 | * Go back to sleep, knowing that when the channel can be | |
8b07d521 | 1260 | * touched safely, the close routine will signal the |
0b99d589 LL |
1261 | * ch_wait_flags to wake us back up. |
1262 | */ | |
851f306d CM |
1263 | if (!((ch->ch_tun.un_flags | |
1264 | ch->ch_pun.un_flags) & | |
1265 | UN_CLOSING)) { | |
0b99d589 LL |
1266 | /* |
1267 | * Our conditions to leave cleanly and happily: | |
1268 | * 1) NONBLOCKING on the tty is set. | |
1269 | * 2) CLOCAL is set. | |
1270 | * 3) DCD (fake or real) is active. | |
1271 | */ | |
1272 | ||
50667c67 | 1273 | if (file->f_flags & O_NONBLOCK) |
0b99d589 | 1274 | break; |
0b99d589 LL |
1275 | |
1276 | if (tty->flags & (1 << TTY_IO_ERROR)) { | |
1277 | retval = -EIO; | |
1278 | break; | |
1279 | } | |
1280 | ||
f1e51745 | 1281 | if (ch->ch_flags & CH_CD) |
0b99d589 | 1282 | break; |
0b99d589 | 1283 | |
f1e51745 | 1284 | if (ch->ch_flags & CH_FCAR) |
0b99d589 | 1285 | break; |
2000c581 | 1286 | } else { |
0b99d589 LL |
1287 | sleep_on_un_flags = 1; |
1288 | } | |
1289 | ||
1290 | /* | |
1291 | * If there is a signal pending, the user probably | |
1292 | * interrupted (ctrl-c) us. | |
1293 | * Leave loop with error set. | |
1294 | */ | |
1295 | if (signal_pending(current)) { | |
0b99d589 LL |
1296 | retval = -ERESTARTSYS; |
1297 | break; | |
1298 | } | |
1299 | ||
0b99d589 LL |
1300 | /* |
1301 | * Store the flags before we let go of channel lock | |
1302 | */ | |
1303 | if (sleep_on_un_flags) | |
1304 | old_flags = ch->ch_tun.un_flags | ch->ch_pun.un_flags; | |
1305 | else | |
1306 | old_flags = ch->ch_flags; | |
1307 | ||
1308 | /* | |
1309 | * Let go of channel lock before calling schedule. | |
1310 | * Our poller will get any FEP events and wake us up when DCD | |
1311 | * eventually goes active. | |
1312 | */ | |
1313 | ||
a44b508a | 1314 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1315 | |
0b99d589 | 1316 | /* |
851f306d CM |
1317 | * Wait for something in the flags to change |
1318 | * from the current value. | |
0b99d589 | 1319 | */ |
50667c67 | 1320 | if (sleep_on_un_flags) |
0b99d589 | 1321 | retval = wait_event_interruptible(un->un_flags_wait, |
851f306d CM |
1322 | (old_flags != (ch->ch_tun.un_flags | |
1323 | ch->ch_pun.un_flags))); | |
50667c67 | 1324 | else |
0b99d589 LL |
1325 | retval = wait_event_interruptible(ch->ch_flags_wait, |
1326 | (old_flags != ch->ch_flags)); | |
0b99d589 | 1327 | |
0b99d589 LL |
1328 | /* |
1329 | * We got woken up for some reason. | |
1330 | * Before looping around, grab our channel lock. | |
1331 | */ | |
a44b508a | 1332 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1333 | } |
1334 | ||
1335 | ch->ch_wopen--; | |
1336 | ||
a44b508a | 1337 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1338 | |
f1e51745 | 1339 | if (retval) |
8f90ef80 | 1340 | return retval; |
0b99d589 | 1341 | |
8f90ef80 | 1342 | return 0; |
0b99d589 LL |
1343 | } |
1344 | ||
0b99d589 LL |
1345 | /* |
1346 | * dgnc_tty_hangup() | |
1347 | * | |
1348 | * Hangup the port. Like a close, but don't wait for output to drain. | |
8b07d521 | 1349 | */ |
0b99d589 LL |
1350 | static void dgnc_tty_hangup(struct tty_struct *tty) |
1351 | { | |
1352 | struct un_t *un; | |
1353 | ||
1354 | if (!tty || tty->magic != TTY_MAGIC) | |
1355 | return; | |
1356 | ||
1357 | un = tty->driver_data; | |
1358 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1359 | return; | |
1360 | ||
0b99d589 LL |
1361 | /* flush the transmit queues */ |
1362 | dgnc_tty_flush_buffer(tty); | |
0b99d589 LL |
1363 | } |
1364 | ||
0b99d589 LL |
1365 | /* |
1366 | * dgnc_tty_close() | |
1367 | * | |
1368 | */ | |
1369 | static void dgnc_tty_close(struct tty_struct *tty, struct file *file) | |
1370 | { | |
03425f55 | 1371 | struct dgnc_board *bd; |
0b99d589 LL |
1372 | struct channel_t *ch; |
1373 | struct un_t *un; | |
a44b508a | 1374 | unsigned long flags; |
0b99d589 LL |
1375 | |
1376 | if (!tty || tty->magic != TTY_MAGIC) | |
1377 | return; | |
1378 | ||
1379 | un = tty->driver_data; | |
1380 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1381 | return; | |
1382 | ||
1383 | ch = un->un_ch; | |
1384 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1385 | return; | |
1386 | ||
1387 | bd = ch->ch_bd; | |
1388 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1389 | return; | |
1390 | ||
a44b508a | 1391 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1392 | |
1393 | /* | |
1394 | * Determine if this is the last close or not - and if we agree about | |
1395 | * which type of close it is with the Line Discipline | |
1396 | */ | |
1397 | if ((tty->count == 1) && (un->un_open_count != 1)) { | |
1398 | /* | |
1399 | * Uh, oh. tty->count is 1, which means that the tty | |
1400 | * structure will be freed. un_open_count should always | |
1401 | * be one in these conditions. If it's greater than | |
1402 | * one, we've got real problems, since it means the | |
1403 | * serial port won't be shutdown. | |
1404 | */ | |
1f26adc9 RD |
1405 | dev_dbg(tty->dev, |
1406 | "tty->count is 1, un open count is %d\n", | |
1407 | un->un_open_count); | |
0b99d589 | 1408 | un->un_open_count = 1; |
8b07d521 | 1409 | } |
0b99d589 | 1410 | |
3098e514 DY |
1411 | if (un->un_open_count) |
1412 | un->un_open_count--; | |
1413 | else | |
1f26adc9 RD |
1414 | dev_dbg(tty->dev, |
1415 | "bad serial port open count of %d\n", | |
1416 | un->un_open_count); | |
0b99d589 LL |
1417 | |
1418 | ch->ch_open_count--; | |
1419 | ||
1420 | if (ch->ch_open_count && un->un_open_count) { | |
a44b508a | 1421 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
90d2a471 LL |
1422 | return; |
1423 | } | |
0b99d589 LL |
1424 | |
1425 | /* OK, its the last close on the unit */ | |
0b99d589 LL |
1426 | un->un_flags |= UN_CLOSING; |
1427 | ||
1428 | tty->closing = 1; | |
1429 | ||
0b99d589 LL |
1430 | /* |
1431 | * Only officially close channel if count is 0 and | |
90d2a471 | 1432 | * DIGI_PRINTER bit is not set. |
0b99d589 | 1433 | */ |
851f306d CM |
1434 | if ((ch->ch_open_count == 0) && |
1435 | !(ch->ch_digi.digi_flags & DIGI_PRINTER)) { | |
0b99d589 LL |
1436 | ch->ch_flags &= ~(CH_STOPI | CH_FORCED_STOPI); |
1437 | ||
1438 | /* | |
1439 | * turn off print device when closing print device. | |
1440 | */ | |
9cdf838b | 1441 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1442 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
6f418259 | 1443 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1444 | ch->ch_flags &= ~CH_PRON; |
1445 | } | |
1446 | ||
a44b508a | 1447 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1448 | /* wait for output to drain */ |
1449 | /* This will also return if we take an interrupt */ | |
1450 | ||
2d9920ec | 1451 | bd->bd_ops->drain(tty, 0); |
0b99d589 | 1452 | |
0b99d589 LL |
1453 | dgnc_tty_flush_buffer(tty); |
1454 | tty_ldisc_flush(tty); | |
1455 | ||
a44b508a | 1456 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1457 | |
1458 | tty->closing = 0; | |
1459 | ||
1460 | /* | |
1461 | * If we have HUPCL set, lower DTR and RTS | |
1462 | */ | |
1463 | if (ch->ch_c_cflag & HUPCL) { | |
0b99d589 LL |
1464 | /* Drop RTS/DTR */ |
1465 | ch->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); | |
1466 | bd->bd_ops->assert_modem_signals(ch); | |
1467 | ||
1468 | /* | |
8b07d521 | 1469 | * Go to sleep to ensure RTS/DTR |
0b99d589 LL |
1470 | * have been dropped for modems to see it. |
1471 | */ | |
1472 | if (ch->ch_close_delay) { | |
a44b508a RD |
1473 | spin_unlock_irqrestore(&ch->ch_lock, |
1474 | flags); | |
0b99d589 | 1475 | dgnc_ms_sleep(ch->ch_close_delay); |
a44b508a | 1476 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1477 | } |
1478 | } | |
1479 | ||
1480 | ch->ch_old_baud = 0; | |
1481 | ||
1482 | /* Turn off UART interrupts for this port */ | |
1483 | ch->ch_bd->bd_ops->uart_off(ch); | |
2000c581 | 1484 | } else { |
0b99d589 LL |
1485 | /* |
1486 | * turn off print device when closing print device. | |
1487 | */ | |
9cdf838b | 1488 | if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { |
0b99d589 | 1489 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, |
6f418259 | 1490 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1491 | ch->ch_flags &= ~CH_PRON; |
1492 | } | |
1493 | } | |
1494 | ||
1495 | un->un_tty = NULL; | |
1496 | un->un_flags &= ~(UN_ISOPEN | UN_CLOSING); | |
1497 | ||
0b99d589 LL |
1498 | wake_up_interruptible(&ch->ch_flags_wait); |
1499 | wake_up_interruptible(&un->un_flags_wait); | |
1500 | ||
a44b508a | 1501 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1502 | } |
1503 | ||
0b99d589 LL |
1504 | /* |
1505 | * dgnc_tty_chars_in_buffer() | |
1506 | * | |
1507 | * Return number of characters that have not been transmitted yet. | |
1508 | * | |
1509 | * This routine is used by the line discipline to determine if there | |
1510 | * is data waiting to be transmitted/drained/flushed or not. | |
1511 | */ | |
1512 | static int dgnc_tty_chars_in_buffer(struct tty_struct *tty) | |
1513 | { | |
1514 | struct channel_t *ch = NULL; | |
1515 | struct un_t *un = NULL; | |
1516 | ushort thead; | |
1517 | ushort ttail; | |
1518 | uint tmask; | |
1519 | uint chars = 0; | |
a44b508a | 1520 | unsigned long flags; |
0b99d589 | 1521 | |
60acb623 | 1522 | if (!tty) |
8f90ef80 | 1523 | return 0; |
0b99d589 LL |
1524 | |
1525 | un = tty->driver_data; | |
1526 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1527 | return 0; |
0b99d589 LL |
1528 | |
1529 | ch = un->un_ch; | |
1530 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1531 | return 0; |
0b99d589 | 1532 | |
a44b508a | 1533 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1534 | |
1535 | tmask = WQUEUEMASK; | |
1536 | thead = ch->ch_w_head & tmask; | |
1537 | ttail = ch->ch_w_tail & tmask; | |
1538 | ||
a44b508a | 1539 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1540 | |
1541 | if (ttail == thead) { | |
1542 | chars = 0; | |
1543 | } else { | |
1544 | if (thead >= ttail) | |
1545 | chars = thead - ttail; | |
1546 | else | |
1547 | chars = thead - ttail + WQUEUESIZE; | |
1548 | } | |
1549 | ||
8f90ef80 | 1550 | return chars; |
0b99d589 LL |
1551 | } |
1552 | ||
8b07d521 | 1553 | /* |
0b99d589 LL |
1554 | * dgnc_maxcps_room |
1555 | * | |
1556 | * Reduces bytes_available to the max number of characters | |
1557 | * that can be sent currently given the maxcps value, and | |
1558 | * returns the new bytes_available. This only affects printer | |
1559 | * output. | |
8b07d521 | 1560 | */ |
0b99d589 LL |
1561 | static int dgnc_maxcps_room(struct tty_struct *tty, int bytes_available) |
1562 | { | |
1563 | struct channel_t *ch = NULL; | |
1564 | struct un_t *un = NULL; | |
1565 | ||
1566 | if (!tty) | |
8f90ef80 | 1567 | return bytes_available; |
0b99d589 LL |
1568 | |
1569 | un = tty->driver_data; | |
1570 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1571 | return bytes_available; |
0b99d589 LL |
1572 | |
1573 | ch = un->un_ch; | |
1574 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1575 | return bytes_available; |
0b99d589 LL |
1576 | |
1577 | /* | |
1578 | * If its not the Transparent print device, return | |
1579 | * the full data amount. | |
1580 | */ | |
1581 | if (un->un_type != DGNC_PRINT) | |
8f90ef80 | 1582 | return bytes_available; |
0b99d589 | 1583 | |
9cdf838b | 1584 | if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0) { |
0b99d589 LL |
1585 | int cps_limit = 0; |
1586 | unsigned long current_time = jiffies; | |
1587 | unsigned long buffer_time = current_time + | |
851f306d CM |
1588 | (HZ * ch->ch_digi.digi_bufsize) / |
1589 | ch->ch_digi.digi_maxcps; | |
0b99d589 LL |
1590 | |
1591 | if (ch->ch_cpstime < current_time) { | |
1592 | /* buffer is empty */ | |
851f306d | 1593 | ch->ch_cpstime = current_time; /* reset ch_cpstime */ |
0b99d589 | 1594 | cps_limit = ch->ch_digi.digi_bufsize; |
2000c581 | 1595 | } else if (ch->ch_cpstime < buffer_time) { |
0b99d589 | 1596 | /* still room in the buffer */ |
851f306d CM |
1597 | cps_limit = ((buffer_time - ch->ch_cpstime) * |
1598 | ch->ch_digi.digi_maxcps) / HZ; | |
2000c581 | 1599 | } else { |
0b99d589 | 1600 | /* no room in the buffer */ |
8b07d521 | 1601 | cps_limit = 0; |
0b99d589 LL |
1602 | } |
1603 | ||
1604 | bytes_available = min(cps_limit, bytes_available); | |
1605 | } | |
1606 | ||
8f90ef80 | 1607 | return bytes_available; |
0b99d589 LL |
1608 | } |
1609 | ||
0b99d589 LL |
1610 | /* |
1611 | * dgnc_tty_write_room() | |
1612 | * | |
1613 | * Return space available in Tx buffer | |
8b07d521 | 1614 | */ |
0b99d589 LL |
1615 | static int dgnc_tty_write_room(struct tty_struct *tty) |
1616 | { | |
1617 | struct channel_t *ch = NULL; | |
1618 | struct un_t *un = NULL; | |
1619 | ushort head; | |
1620 | ushort tail; | |
1621 | ushort tmask; | |
1622 | int ret = 0; | |
a44b508a | 1623 | unsigned long flags; |
0b99d589 | 1624 | |
60acb623 | 1625 | if (!tty || !dgnc_TmpWriteBuf) |
8f90ef80 | 1626 | return 0; |
0b99d589 LL |
1627 | |
1628 | un = tty->driver_data; | |
1629 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1630 | return 0; |
0b99d589 LL |
1631 | |
1632 | ch = un->un_ch; | |
1633 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1634 | return 0; |
0b99d589 | 1635 | |
a44b508a | 1636 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1637 | |
1638 | tmask = WQUEUEMASK; | |
1639 | head = (ch->ch_w_head) & tmask; | |
1640 | tail = (ch->ch_w_tail) & tmask; | |
1641 | ||
f7c851d4 CP |
1642 | ret = tail - head - 1; |
1643 | if (ret < 0) | |
0b99d589 LL |
1644 | ret += WQUEUESIZE; |
1645 | ||
1646 | /* Limit printer to maxcps */ | |
1647 | ret = dgnc_maxcps_room(tty, ret); | |
1648 | ||
1649 | /* | |
8b07d521 | 1650 | * If we are printer device, leave space for |
0b99d589 LL |
1651 | * possibly both the on and off strings. |
1652 | */ | |
1653 | if (un->un_type == DGNC_PRINT) { | |
1654 | if (!(ch->ch_flags & CH_PRON)) | |
1655 | ret -= ch->ch_digi.digi_onlen; | |
1656 | ret -= ch->ch_digi.digi_offlen; | |
2000c581 | 1657 | } else { |
0b99d589 LL |
1658 | if (ch->ch_flags & CH_PRON) |
1659 | ret -= ch->ch_digi.digi_offlen; | |
1660 | } | |
1661 | ||
1662 | if (ret < 0) | |
1663 | ret = 0; | |
1664 | ||
a44b508a | 1665 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8b07d521 | 1666 | |
8f90ef80 | 1667 | return ret; |
0b99d589 LL |
1668 | } |
1669 | ||
0b99d589 LL |
1670 | /* |
1671 | * dgnc_tty_put_char() | |
1672 | * | |
1673 | * Put a character into ch->ch_buf | |
8b07d521 | 1674 | * |
0b99d589 LL |
1675 | * - used by the line discipline for OPOST processing |
1676 | */ | |
1677 | static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c) | |
1678 | { | |
1679 | /* | |
1680 | * Simply call tty_write. | |
1681 | */ | |
0b99d589 LL |
1682 | dgnc_tty_write(tty, &c, 1); |
1683 | return 1; | |
1684 | } | |
1685 | ||
0b99d589 LL |
1686 | /* |
1687 | * dgnc_tty_write() | |
1688 | * | |
1689 | * Take data from the user or kernel and send it out to the FEP. | |
1690 | * In here exists all the Transparent Print magic as well. | |
1691 | */ | |
1692 | static int dgnc_tty_write(struct tty_struct *tty, | |
1693 | const unsigned char *buf, int count) | |
1694 | { | |
1695 | struct channel_t *ch = NULL; | |
1696 | struct un_t *un = NULL; | |
1697 | int bufcount = 0, n = 0; | |
a44b508a | 1698 | unsigned long flags; |
0b99d589 LL |
1699 | ushort head; |
1700 | ushort tail; | |
1701 | ushort tmask; | |
1702 | uint remain; | |
0b99d589 | 1703 | |
60acb623 | 1704 | if (!tty || !dgnc_TmpWriteBuf) |
8f90ef80 | 1705 | return 0; |
0b99d589 LL |
1706 | |
1707 | un = tty->driver_data; | |
1708 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 1709 | return 0; |
0b99d589 LL |
1710 | |
1711 | ch = un->un_ch; | |
1712 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 1713 | return 0; |
0b99d589 LL |
1714 | |
1715 | if (!count) | |
8f90ef80 | 1716 | return 0; |
0b99d589 | 1717 | |
0b99d589 LL |
1718 | /* |
1719 | * Store original amount of characters passed in. | |
1720 | * This helps to figure out if we should ask the FEP | |
1721 | * to send us an event when it has more space available. | |
1722 | */ | |
0b99d589 | 1723 | |
a44b508a | 1724 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1725 | |
1726 | /* Get our space available for the channel from the board */ | |
1727 | tmask = WQUEUEMASK; | |
1728 | head = (ch->ch_w_head) & tmask; | |
1729 | tail = (ch->ch_w_tail) & tmask; | |
1730 | ||
f7c851d4 CP |
1731 | bufcount = tail - head - 1; |
1732 | if (bufcount < 0) | |
0b99d589 LL |
1733 | bufcount += WQUEUESIZE; |
1734 | ||
0b99d589 LL |
1735 | /* |
1736 | * Limit printer output to maxcps overall, with bursts allowed | |
1737 | * up to bufsize characters. | |
1738 | */ | |
1739 | bufcount = dgnc_maxcps_room(tty, bufcount); | |
1740 | ||
1741 | /* | |
1742 | * Take minimum of what the user wants to send, and the | |
1743 | * space available in the FEP buffer. | |
1744 | */ | |
1745 | count = min(count, bufcount); | |
1746 | ||
1747 | /* | |
1748 | * Bail if no space left. | |
1749 | */ | |
c84a083b QL |
1750 | if (count <= 0) |
1751 | goto exit_retry; | |
0b99d589 LL |
1752 | |
1753 | /* | |
1754 | * Output the printer ON string, if we are in terminal mode, but | |
1755 | * need to be in printer mode. | |
1756 | */ | |
1757 | if ((un->un_type == DGNC_PRINT) && !(ch->ch_flags & CH_PRON)) { | |
1758 | dgnc_wmove(ch, ch->ch_digi.digi_onstr, | |
6f418259 | 1759 | (int)ch->ch_digi.digi_onlen); |
0b99d589 LL |
1760 | head = (ch->ch_w_head) & tmask; |
1761 | ch->ch_flags |= CH_PRON; | |
1762 | } | |
1763 | ||
1764 | /* | |
1765 | * On the other hand, output the printer OFF string, if we are | |
1766 | * currently in printer mode, but need to output to the terminal. | |
1767 | */ | |
1768 | if ((un->un_type != DGNC_PRINT) && (ch->ch_flags & CH_PRON)) { | |
1769 | dgnc_wmove(ch, ch->ch_digi.digi_offstr, | |
6f418259 | 1770 | (int)ch->ch_digi.digi_offlen); |
0b99d589 LL |
1771 | head = (ch->ch_w_head) & tmask; |
1772 | ch->ch_flags &= ~CH_PRON; | |
1773 | } | |
1774 | ||
0b99d589 LL |
1775 | n = count; |
1776 | ||
1777 | /* | |
1778 | * If the write wraps over the top of the circular buffer, | |
1779 | * move the portion up to the wrap point, and reset the | |
1780 | * pointers to the bottom. | |
1781 | */ | |
1782 | remain = WQUEUESIZE - head; | |
1783 | ||
1784 | if (n >= remain) { | |
1785 | n -= remain; | |
1786 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1787 | head = 0; |
1788 | buf += remain; | |
1789 | } | |
1790 | ||
1791 | if (n > 0) { | |
1792 | /* | |
1793 | * Move rest of data. | |
1794 | */ | |
1795 | remain = n; | |
1796 | memcpy(ch->ch_wqueue + head, buf, remain); | |
0b99d589 LL |
1797 | head += remain; |
1798 | } | |
1799 | ||
1800 | if (count) { | |
1801 | head &= tmask; | |
1802 | ch->ch_w_head = head; | |
1803 | } | |
1804 | ||
0b99d589 LL |
1805 | /* Update printer buffer empty time. */ |
1806 | if ((un->un_type == DGNC_PRINT) && (ch->ch_digi.digi_maxcps > 0) | |
1807 | && (ch->ch_digi.digi_bufsize > 0)) { | |
90d2a471 | 1808 | ch->ch_cpstime += (HZ * count) / ch->ch_digi.digi_maxcps; |
0b99d589 LL |
1809 | } |
1810 | ||
a74d8e21 | 1811 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1812 | |
0b99d589 LL |
1813 | if (count) { |
1814 | /* | |
1815 | * Channel lock is grabbed and then released | |
1816 | * inside this routine. | |
1817 | */ | |
1818 | ch->ch_bd->bd_ops->copy_data_from_queue_to_uart(ch); | |
1819 | } | |
1820 | ||
8f90ef80 | 1821 | return count; |
c84a083b QL |
1822 | |
1823 | exit_retry: | |
1824 | ||
1825 | spin_unlock_irqrestore(&ch->ch_lock, flags); | |
1826 | return 0; | |
0b99d589 LL |
1827 | } |
1828 | ||
0b99d589 LL |
1829 | /* |
1830 | * Return modem signals to ld. | |
1831 | */ | |
b74c7461 | 1832 | |
0b99d589 | 1833 | static int dgnc_tty_tiocmget(struct tty_struct *tty) |
0b99d589 LL |
1834 | { |
1835 | struct channel_t *ch; | |
1836 | struct un_t *un; | |
1837 | int result = -EIO; | |
446393e9 | 1838 | unsigned char mstat = 0; |
a44b508a | 1839 | unsigned long flags; |
0b99d589 LL |
1840 | |
1841 | if (!tty || tty->magic != TTY_MAGIC) | |
1842 | return result; | |
1843 | ||
1844 | un = tty->driver_data; | |
1845 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1846 | return result; | |
1847 | ||
1848 | ch = un->un_ch; | |
1849 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1850 | return result; | |
1851 | ||
a44b508a | 1852 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1853 | |
1854 | mstat = (ch->ch_mostat | ch->ch_mistat); | |
1855 | ||
a44b508a | 1856 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
1857 | |
1858 | result = 0; | |
1859 | ||
1860 | if (mstat & UART_MCR_DTR) | |
1861 | result |= TIOCM_DTR; | |
1862 | if (mstat & UART_MCR_RTS) | |
1863 | result |= TIOCM_RTS; | |
1864 | if (mstat & UART_MSR_CTS) | |
1865 | result |= TIOCM_CTS; | |
1866 | if (mstat & UART_MSR_DSR) | |
1867 | result |= TIOCM_DSR; | |
1868 | if (mstat & UART_MSR_RI) | |
1869 | result |= TIOCM_RI; | |
1870 | if (mstat & UART_MSR_DCD) | |
1871 | result |= TIOCM_CD; | |
1872 | ||
0b99d589 LL |
1873 | return result; |
1874 | } | |
1875 | ||
0b99d589 LL |
1876 | /* |
1877 | * dgnc_tty_tiocmset() | |
1878 | * | |
1879 | * Set modem signals, called by ld. | |
1880 | */ | |
b74c7461 | 1881 | |
0b99d589 | 1882 | static int dgnc_tty_tiocmset(struct tty_struct *tty, |
90d2a471 | 1883 | unsigned int set, unsigned int clear) |
0b99d589 | 1884 | { |
03425f55 | 1885 | struct dgnc_board *bd; |
0b99d589 LL |
1886 | struct channel_t *ch; |
1887 | struct un_t *un; | |
1888 | int ret = -EIO; | |
a44b508a | 1889 | unsigned long flags; |
0b99d589 LL |
1890 | |
1891 | if (!tty || tty->magic != TTY_MAGIC) | |
1892 | return ret; | |
1893 | ||
1894 | un = tty->driver_data; | |
1895 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1896 | return ret; | |
1897 | ||
1898 | ch = un->un_ch; | |
1899 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1900 | return ret; | |
1901 | ||
1902 | bd = ch->ch_bd; | |
1903 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1904 | return ret; | |
1905 | ||
a44b508a | 1906 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 1907 | |
50667c67 | 1908 | if (set & TIOCM_RTS) |
0b99d589 | 1909 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 1910 | |
50667c67 | 1911 | if (set & TIOCM_DTR) |
0b99d589 | 1912 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 | 1913 | |
50667c67 | 1914 | if (clear & TIOCM_RTS) |
0b99d589 | 1915 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 1916 | |
50667c67 | 1917 | if (clear & TIOCM_DTR) |
0b99d589 | 1918 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
1919 | |
1920 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
1921 | ||
a44b508a | 1922 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1923 | |
8f90ef80 | 1924 | return 0; |
0b99d589 LL |
1925 | } |
1926 | ||
0b99d589 LL |
1927 | /* |
1928 | * dgnc_tty_send_break() | |
1929 | * | |
1930 | * Send a Break, called by ld. | |
1931 | */ | |
1932 | static int dgnc_tty_send_break(struct tty_struct *tty, int msec) | |
1933 | { | |
03425f55 | 1934 | struct dgnc_board *bd; |
0b99d589 LL |
1935 | struct channel_t *ch; |
1936 | struct un_t *un; | |
1937 | int ret = -EIO; | |
a44b508a | 1938 | unsigned long flags; |
0b99d589 LL |
1939 | |
1940 | if (!tty || tty->magic != TTY_MAGIC) | |
1941 | return ret; | |
1942 | ||
1943 | un = tty->driver_data; | |
1944 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1945 | return ret; | |
1946 | ||
1947 | ch = un->un_ch; | |
1948 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1949 | return ret; | |
1950 | ||
1951 | bd = ch->ch_bd; | |
1952 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1953 | return ret; | |
1954 | ||
1955 | switch (msec) { | |
1956 | case -1: | |
1957 | msec = 0xFFFF; | |
1958 | break; | |
1959 | case 0: | |
1960 | msec = 0; | |
1961 | break; | |
1962 | default: | |
1963 | break; | |
1964 | } | |
1965 | ||
a44b508a | 1966 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
1967 | |
1968 | ch->ch_bd->bd_ops->send_break(ch, msec); | |
1969 | ||
a44b508a | 1970 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 1971 | |
8f90ef80 | 1972 | return 0; |
0b99d589 LL |
1973 | } |
1974 | ||
0b99d589 LL |
1975 | /* |
1976 | * dgnc_tty_wait_until_sent() | |
1977 | * | |
1978 | * wait until data has been transmitted, called by ld. | |
1979 | */ | |
1980 | static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout) | |
1981 | { | |
03425f55 | 1982 | struct dgnc_board *bd; |
0b99d589 LL |
1983 | struct channel_t *ch; |
1984 | struct un_t *un; | |
0b99d589 LL |
1985 | |
1986 | if (!tty || tty->magic != TTY_MAGIC) | |
1987 | return; | |
1988 | ||
1989 | un = tty->driver_data; | |
1990 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
1991 | return; | |
1992 | ||
1993 | ch = un->un_ch; | |
1994 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
1995 | return; | |
1996 | ||
1997 | bd = ch->ch_bd; | |
1998 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
1999 | return; | |
2000 | ||
2d9920ec | 2001 | bd->bd_ops->drain(tty, 0); |
8b07d521 | 2002 | } |
0b99d589 | 2003 | |
0b99d589 LL |
2004 | /* |
2005 | * dgnc_send_xchar() | |
2006 | * | |
2007 | * send a high priority character, called by ld. | |
2008 | */ | |
2009 | static void dgnc_tty_send_xchar(struct tty_struct *tty, char c) | |
2010 | { | |
03425f55 | 2011 | struct dgnc_board *bd; |
0b99d589 LL |
2012 | struct channel_t *ch; |
2013 | struct un_t *un; | |
a44b508a | 2014 | unsigned long flags; |
0b99d589 LL |
2015 | |
2016 | if (!tty || tty->magic != TTY_MAGIC) | |
2017 | return; | |
2018 | ||
2019 | un = tty->driver_data; | |
2020 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2021 | return; | |
2022 | ||
2023 | ch = un->un_ch; | |
2024 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2025 | return; | |
2026 | ||
2027 | bd = ch->ch_bd; | |
2028 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2029 | return; | |
2030 | ||
f3dadd29 | 2031 | dev_dbg(tty->dev, "dgnc_tty_send_xchar start\n"); |
0b99d589 | 2032 | |
a44b508a | 2033 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2034 | bd->bd_ops->send_immediate_char(ch, c); |
a44b508a | 2035 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2036 | |
f3dadd29 | 2037 | dev_dbg(tty->dev, "dgnc_tty_send_xchar finish\n"); |
8b07d521 | 2038 | } |
0b99d589 | 2039 | |
0b99d589 LL |
2040 | /* |
2041 | * Return modem signals to ld. | |
2042 | */ | |
2043 | static inline int dgnc_get_mstat(struct channel_t *ch) | |
2044 | { | |
2045 | unsigned char mstat; | |
2046 | int result = -EIO; | |
a44b508a | 2047 | unsigned long flags; |
0b99d589 | 2048 | |
0b99d589 | 2049 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
8f90ef80 | 2050 | return -ENXIO; |
0b99d589 | 2051 | |
a44b508a | 2052 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2053 | |
2054 | mstat = (ch->ch_mostat | ch->ch_mistat); | |
2055 | ||
a44b508a | 2056 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2057 | |
2058 | result = 0; | |
2059 | ||
2060 | if (mstat & UART_MCR_DTR) | |
2061 | result |= TIOCM_DTR; | |
2062 | if (mstat & UART_MCR_RTS) | |
2063 | result |= TIOCM_RTS; | |
2064 | if (mstat & UART_MSR_CTS) | |
2065 | result |= TIOCM_CTS; | |
2066 | if (mstat & UART_MSR_DSR) | |
2067 | result |= TIOCM_DSR; | |
2068 | if (mstat & UART_MSR_RI) | |
2069 | result |= TIOCM_RI; | |
2070 | if (mstat & UART_MSR_DCD) | |
2071 | result |= TIOCM_CD; | |
2072 | ||
8f90ef80 | 2073 | return result; |
0b99d589 LL |
2074 | } |
2075 | ||
0b99d589 LL |
2076 | /* |
2077 | * Return modem signals to ld. | |
2078 | */ | |
851f306d CM |
2079 | static int dgnc_get_modem_info(struct channel_t *ch, |
2080 | unsigned int __user *value) | |
0b99d589 LL |
2081 | { |
2082 | int result; | |
0b99d589 | 2083 | |
0b99d589 | 2084 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) |
8f90ef80 | 2085 | return -ENXIO; |
0b99d589 LL |
2086 | |
2087 | result = dgnc_get_mstat(ch); | |
2088 | ||
2089 | if (result < 0) | |
8f90ef80 | 2090 | return -ENXIO; |
0b99d589 | 2091 | |
3dfe7557 | 2092 | return put_user(result, value); |
0b99d589 LL |
2093 | } |
2094 | ||
0b99d589 LL |
2095 | /* |
2096 | * dgnc_set_modem_info() | |
2097 | * | |
2098 | * Set modem signals, called by ld. | |
2099 | */ | |
851f306d CM |
2100 | static int dgnc_set_modem_info(struct tty_struct *tty, |
2101 | unsigned int command, | |
2102 | unsigned int __user *value) | |
0b99d589 | 2103 | { |
03425f55 | 2104 | struct dgnc_board *bd; |
0b99d589 LL |
2105 | struct channel_t *ch; |
2106 | struct un_t *un; | |
2107 | int ret = -ENXIO; | |
2108 | unsigned int arg = 0; | |
a44b508a | 2109 | unsigned long flags; |
0b99d589 LL |
2110 | |
2111 | if (!tty || tty->magic != TTY_MAGIC) | |
2112 | return ret; | |
2113 | ||
2114 | un = tty->driver_data; | |
2115 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2116 | return ret; | |
2117 | ||
2118 | ch = un->un_ch; | |
2119 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2120 | return ret; | |
2121 | ||
2122 | bd = ch->ch_bd; | |
2123 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2124 | return ret; | |
2125 | ||
0b99d589 LL |
2126 | ret = get_user(arg, value); |
2127 | if (ret) | |
8f90ef80 | 2128 | return ret; |
0b99d589 LL |
2129 | |
2130 | switch (command) { | |
2131 | case TIOCMBIS: | |
50667c67 | 2132 | if (arg & TIOCM_RTS) |
0b99d589 | 2133 | ch->ch_mostat |= UART_MCR_RTS; |
0b99d589 | 2134 | |
50667c67 | 2135 | if (arg & TIOCM_DTR) |
0b99d589 | 2136 | ch->ch_mostat |= UART_MCR_DTR; |
0b99d589 LL |
2137 | |
2138 | break; | |
2139 | ||
2140 | case TIOCMBIC: | |
50667c67 | 2141 | if (arg & TIOCM_RTS) |
0b99d589 | 2142 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 2143 | |
50667c67 | 2144 | if (arg & TIOCM_DTR) |
0b99d589 | 2145 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
2146 | |
2147 | break; | |
2148 | ||
90d2a471 | 2149 | case TIOCMSET: |
0b99d589 | 2150 | |
50667c67 | 2151 | if (arg & TIOCM_RTS) |
0b99d589 | 2152 | ch->ch_mostat |= UART_MCR_RTS; |
50667c67 | 2153 | else |
0b99d589 | 2154 | ch->ch_mostat &= ~(UART_MCR_RTS); |
0b99d589 | 2155 | |
50667c67 | 2156 | if (arg & TIOCM_DTR) |
0b99d589 | 2157 | ch->ch_mostat |= UART_MCR_DTR; |
50667c67 | 2158 | else |
0b99d589 | 2159 | ch->ch_mostat &= ~(UART_MCR_DTR); |
0b99d589 LL |
2160 | |
2161 | break; | |
2162 | ||
2163 | default: | |
8f90ef80 | 2164 | return -EINVAL; |
0b99d589 LL |
2165 | } |
2166 | ||
a44b508a | 2167 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2168 | |
2169 | ch->ch_bd->bd_ops->assert_modem_signals(ch); | |
2170 | ||
a44b508a | 2171 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2172 | |
8f90ef80 | 2173 | return 0; |
0b99d589 LL |
2174 | } |
2175 | ||
0b99d589 | 2176 | /* |
8b07d521 | 2177 | * dgnc_tty_digigeta() |
0b99d589 LL |
2178 | * |
2179 | * Ioctl to get the information for ditty. | |
2180 | * | |
2181 | * | |
2182 | * | |
2183 | */ | |
851f306d CM |
2184 | static int dgnc_tty_digigeta(struct tty_struct *tty, |
2185 | struct digi_t __user *retinfo) | |
0b99d589 LL |
2186 | { |
2187 | struct channel_t *ch; | |
2188 | struct un_t *un; | |
2189 | struct digi_t tmp; | |
a44b508a | 2190 | unsigned long flags; |
0b99d589 LL |
2191 | |
2192 | if (!retinfo) | |
8f90ef80 | 2193 | return -EFAULT; |
0b99d589 LL |
2194 | |
2195 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2196 | return -EFAULT; |
0b99d589 LL |
2197 | |
2198 | un = tty->driver_data; | |
2199 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2200 | return -EFAULT; |
0b99d589 LL |
2201 | |
2202 | ch = un->un_ch; | |
2203 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2204 | return -EFAULT; |
0b99d589 LL |
2205 | |
2206 | memset(&tmp, 0, sizeof(tmp)); | |
2207 | ||
a44b508a | 2208 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2209 | memcpy(&tmp, &ch->ch_digi, sizeof(tmp)); |
a44b508a | 2210 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2211 | |
2212 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) | |
8f90ef80 | 2213 | return -EFAULT; |
0b99d589 | 2214 | |
8f90ef80 | 2215 | return 0; |
0b99d589 LL |
2216 | } |
2217 | ||
0b99d589 | 2218 | /* |
8b07d521 | 2219 | * dgnc_tty_digiseta() |
0b99d589 LL |
2220 | * |
2221 | * Ioctl to set the information for ditty. | |
2222 | * | |
2223 | * | |
2224 | * | |
2225 | */ | |
851f306d CM |
2226 | static int dgnc_tty_digiseta(struct tty_struct *tty, |
2227 | struct digi_t __user *new_info) | |
0b99d589 | 2228 | { |
03425f55 | 2229 | struct dgnc_board *bd; |
0b99d589 LL |
2230 | struct channel_t *ch; |
2231 | struct un_t *un; | |
2232 | struct digi_t new_digi; | |
a44b508a | 2233 | unsigned long flags; |
0b99d589 | 2234 | |
0b99d589 | 2235 | if (!tty || tty->magic != TTY_MAGIC) |
8f90ef80 | 2236 | return -EFAULT; |
0b99d589 LL |
2237 | |
2238 | un = tty->driver_data; | |
2239 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2240 | return -EFAULT; |
0b99d589 LL |
2241 | |
2242 | ch = un->un_ch; | |
2243 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2244 | return -EFAULT; |
0b99d589 LL |
2245 | |
2246 | bd = ch->ch_bd; | |
2247 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2248 | return -EFAULT; |
0b99d589 | 2249 | |
f1e51745 | 2250 | if (copy_from_user(&new_digi, new_info, sizeof(new_digi))) |
8f90ef80 | 2251 | return -EFAULT; |
0b99d589 | 2252 | |
a44b508a | 2253 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2254 | |
2255 | /* | |
2256 | * Handle transistions to and from RTS Toggle. | |
2257 | */ | |
851f306d CM |
2258 | if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2259 | (new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 | 2260 | ch->ch_mostat &= ~(UART_MCR_RTS); |
851f306d CM |
2261 | if ((ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && |
2262 | !(new_digi.digi_flags & DIGI_RTS_TOGGLE)) | |
0b99d589 LL |
2263 | ch->ch_mostat |= (UART_MCR_RTS); |
2264 | ||
2265 | /* | |
2266 | * Handle transistions to and from DTR Toggle. | |
2267 | */ | |
851f306d CM |
2268 | if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2269 | (new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 | 2270 | ch->ch_mostat &= ~(UART_MCR_DTR); |
851f306d CM |
2271 | if ((ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && |
2272 | !(new_digi.digi_flags & DIGI_DTR_TOGGLE)) | |
0b99d589 LL |
2273 | ch->ch_mostat |= (UART_MCR_DTR); |
2274 | ||
a07bf39a | 2275 | memcpy(&ch->ch_digi, &new_digi, sizeof(new_digi)); |
0b99d589 | 2276 | |
8b07d521 | 2277 | if (ch->ch_digi.digi_maxcps < 1) |
0b99d589 LL |
2278 | ch->ch_digi.digi_maxcps = 1; |
2279 | ||
8b07d521 | 2280 | if (ch->ch_digi.digi_maxcps > 10000) |
0b99d589 LL |
2281 | ch->ch_digi.digi_maxcps = 10000; |
2282 | ||
2283 | if (ch->ch_digi.digi_bufsize < 10) | |
2284 | ch->ch_digi.digi_bufsize = 10; | |
2285 | ||
2286 | if (ch->ch_digi.digi_maxchar < 1) | |
2287 | ch->ch_digi.digi_maxchar = 1; | |
2288 | ||
2289 | if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize) | |
2290 | ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize; | |
2291 | ||
2292 | if (ch->ch_digi.digi_onlen > DIGI_PLEN) | |
2293 | ch->ch_digi.digi_onlen = DIGI_PLEN; | |
2294 | ||
2295 | if (ch->ch_digi.digi_offlen > DIGI_PLEN) | |
2296 | ch->ch_digi.digi_offlen = DIGI_PLEN; | |
2297 | ||
2298 | ch->ch_bd->bd_ops->param(tty); | |
2299 | ||
a44b508a | 2300 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2301 | |
8f90ef80 | 2302 | return 0; |
0b99d589 LL |
2303 | } |
2304 | ||
0b99d589 LL |
2305 | /* |
2306 | * dgnc_set_termios() | |
2307 | */ | |
851f306d CM |
2308 | static void dgnc_tty_set_termios(struct tty_struct *tty, |
2309 | struct ktermios *old_termios) | |
0b99d589 | 2310 | { |
03425f55 | 2311 | struct dgnc_board *bd; |
0b99d589 LL |
2312 | struct channel_t *ch; |
2313 | struct un_t *un; | |
a44b508a | 2314 | unsigned long flags; |
0b99d589 LL |
2315 | |
2316 | if (!tty || tty->magic != TTY_MAGIC) | |
2317 | return; | |
2318 | ||
2319 | un = tty->driver_data; | |
2320 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2321 | return; | |
2322 | ||
2323 | ch = un->un_ch; | |
2324 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2325 | return; | |
2326 | ||
2327 | bd = ch->ch_bd; | |
2328 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2329 | return; | |
2330 | ||
a44b508a | 2331 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2332 | |
22e3de76 LL |
2333 | ch->ch_c_cflag = tty->termios.c_cflag; |
2334 | ch->ch_c_iflag = tty->termios.c_iflag; | |
2335 | ch->ch_c_oflag = tty->termios.c_oflag; | |
2336 | ch->ch_c_lflag = tty->termios.c_lflag; | |
2337 | ch->ch_startc = tty->termios.c_cc[VSTART]; | |
2338 | ch->ch_stopc = tty->termios.c_cc[VSTOP]; | |
0b99d589 LL |
2339 | |
2340 | ch->ch_bd->bd_ops->param(tty); | |
2341 | dgnc_carrier(ch); | |
2342 | ||
a44b508a | 2343 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2344 | } |
2345 | ||
0b99d589 LL |
2346 | static void dgnc_tty_throttle(struct tty_struct *tty) |
2347 | { | |
2348 | struct channel_t *ch; | |
2349 | struct un_t *un; | |
a44b508a | 2350 | unsigned long flags; |
0b99d589 LL |
2351 | |
2352 | if (!tty || tty->magic != TTY_MAGIC) | |
2353 | return; | |
2354 | ||
2355 | un = tty->driver_data; | |
2356 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2357 | return; | |
8b07d521 | 2358 | |
90d2a471 LL |
2359 | ch = un->un_ch; |
2360 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2361 | return; | |
0b99d589 | 2362 | |
a44b508a | 2363 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2364 | |
2365 | ch->ch_flags |= (CH_FORCED_STOPI); | |
2366 | ||
a44b508a | 2367 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2368 | } |
2369 | ||
0b99d589 LL |
2370 | static void dgnc_tty_unthrottle(struct tty_struct *tty) |
2371 | { | |
2372 | struct channel_t *ch; | |
2373 | struct un_t *un; | |
a44b508a | 2374 | unsigned long flags; |
0b99d589 LL |
2375 | |
2376 | if (!tty || tty->magic != TTY_MAGIC) | |
2377 | return; | |
2378 | ||
2379 | un = tty->driver_data; | |
2380 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2381 | return; | |
8b07d521 | 2382 | |
90d2a471 LL |
2383 | ch = un->un_ch; |
2384 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2385 | return; | |
0b99d589 | 2386 | |
a44b508a | 2387 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2388 | |
2389 | ch->ch_flags &= ~(CH_FORCED_STOPI); | |
2390 | ||
a44b508a | 2391 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2392 | } |
2393 | ||
0b99d589 LL |
2394 | static void dgnc_tty_start(struct tty_struct *tty) |
2395 | { | |
03425f55 | 2396 | struct dgnc_board *bd; |
0b99d589 LL |
2397 | struct channel_t *ch; |
2398 | struct un_t *un; | |
a44b508a | 2399 | unsigned long flags; |
0b99d589 LL |
2400 | |
2401 | if (!tty || tty->magic != TTY_MAGIC) | |
2402 | return; | |
2403 | ||
2404 | un = tty->driver_data; | |
2405 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2406 | return; | |
8b07d521 | 2407 | |
90d2a471 LL |
2408 | ch = un->un_ch; |
2409 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2410 | return; | |
0b99d589 LL |
2411 | |
2412 | bd = ch->ch_bd; | |
2413 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2414 | return; | |
2415 | ||
a44b508a | 2416 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2417 | |
2418 | ch->ch_flags &= ~(CH_FORCED_STOP); | |
2419 | ||
a44b508a | 2420 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2421 | } |
2422 | ||
0b99d589 LL |
2423 | static void dgnc_tty_stop(struct tty_struct *tty) |
2424 | { | |
03425f55 | 2425 | struct dgnc_board *bd; |
0b99d589 LL |
2426 | struct channel_t *ch; |
2427 | struct un_t *un; | |
a44b508a | 2428 | unsigned long flags; |
0b99d589 LL |
2429 | |
2430 | if (!tty || tty->magic != TTY_MAGIC) | |
2431 | return; | |
2432 | ||
2433 | un = tty->driver_data; | |
2434 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2435 | return; | |
8b07d521 | 2436 | |
90d2a471 LL |
2437 | ch = un->un_ch; |
2438 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2439 | return; | |
0b99d589 LL |
2440 | |
2441 | bd = ch->ch_bd; | |
2442 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2443 | return; | |
2444 | ||
a44b508a | 2445 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2446 | |
2447 | ch->ch_flags |= (CH_FORCED_STOP); | |
2448 | ||
a44b508a | 2449 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2450 | } |
2451 | ||
8b07d521 | 2452 | /* |
0b99d589 LL |
2453 | * dgnc_tty_flush_chars() |
2454 | * | |
2455 | * Flush the cook buffer | |
2456 | * | |
2457 | * Note to self, and any other poor souls who venture here: | |
2458 | * | |
2459 | * flush in this case DOES NOT mean dispose of the data. | |
2460 | * instead, it means "stop buffering and send it if you | |
2461 | * haven't already." Just guess how I figured that out... SRW 2-Jun-98 | |
2462 | * | |
2463 | * It is also always called in interrupt context - JAR 8-Sept-99 | |
2464 | */ | |
2465 | static void dgnc_tty_flush_chars(struct tty_struct *tty) | |
2466 | { | |
03425f55 | 2467 | struct dgnc_board *bd; |
0b99d589 LL |
2468 | struct channel_t *ch; |
2469 | struct un_t *un; | |
a44b508a | 2470 | unsigned long flags; |
0b99d589 LL |
2471 | |
2472 | if (!tty || tty->magic != TTY_MAGIC) | |
2473 | return; | |
2474 | ||
2475 | un = tty->driver_data; | |
2476 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2477 | return; | |
8b07d521 | 2478 | |
90d2a471 LL |
2479 | ch = un->un_ch; |
2480 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2481 | return; | |
0b99d589 LL |
2482 | |
2483 | bd = ch->ch_bd; | |
2484 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
2485 | return; | |
2486 | ||
a44b508a | 2487 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2488 | |
2489 | /* Do something maybe here */ | |
2490 | ||
a44b508a | 2491 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2492 | } |
2493 | ||
0b99d589 LL |
2494 | /* |
2495 | * dgnc_tty_flush_buffer() | |
8b07d521 | 2496 | * |
0b99d589 LL |
2497 | * Flush Tx buffer (make in == out) |
2498 | */ | |
2499 | static void dgnc_tty_flush_buffer(struct tty_struct *tty) | |
2500 | { | |
2501 | struct channel_t *ch; | |
2502 | struct un_t *un; | |
a44b508a | 2503 | unsigned long flags; |
0b99d589 LL |
2504 | |
2505 | if (!tty || tty->magic != TTY_MAGIC) | |
2506 | return; | |
2507 | ||
2508 | un = tty->driver_data; | |
2509 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
2510 | return; | |
8b07d521 | 2511 | |
90d2a471 LL |
2512 | ch = un->un_ch; |
2513 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
2514 | return; | |
0b99d589 | 2515 | |
a44b508a | 2516 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2517 | |
2518 | ch->ch_flags &= ~CH_STOP; | |
2519 | ||
2520 | /* Flush our write queue */ | |
2521 | ch->ch_w_head = ch->ch_w_tail; | |
2522 | ||
2523 | /* Flush UARTs transmit FIFO */ | |
2524 | ch->ch_bd->bd_ops->flush_uart_write(ch); | |
2525 | ||
2526 | if (ch->ch_tun.un_flags & (UN_LOW|UN_EMPTY)) { | |
2527 | ch->ch_tun.un_flags &= ~(UN_LOW|UN_EMPTY); | |
2528 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); | |
2529 | } | |
2530 | if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) { | |
2531 | ch->ch_pun.un_flags &= ~(UN_LOW|UN_EMPTY); | |
2532 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); | |
2533 | } | |
2534 | ||
a44b508a | 2535 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2536 | } |
2537 | ||
0b99d589 LL |
2538 | /***************************************************************************** |
2539 | * | |
2540 | * The IOCTL function and all of its helpers | |
2541 | * | |
2542 | *****************************************************************************/ | |
8b07d521 | 2543 | |
0b99d589 LL |
2544 | /* |
2545 | * dgnc_tty_ioctl() | |
2546 | * | |
2547 | * The usual assortment of ioctl's | |
2548 | */ | |
a31cefa2 | 2549 | static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
0b99d589 LL |
2550 | unsigned long arg) |
2551 | { | |
03425f55 | 2552 | struct dgnc_board *bd; |
0b99d589 LL |
2553 | struct channel_t *ch; |
2554 | struct un_t *un; | |
2555 | int rc; | |
a44b508a | 2556 | unsigned long flags; |
6f418259 | 2557 | void __user *uarg = (void __user *)arg; |
0b99d589 LL |
2558 | |
2559 | if (!tty || tty->magic != TTY_MAGIC) | |
8f90ef80 | 2560 | return -ENODEV; |
0b99d589 LL |
2561 | |
2562 | un = tty->driver_data; | |
2563 | if (!un || un->magic != DGNC_UNIT_MAGIC) | |
8f90ef80 | 2564 | return -ENODEV; |
0b99d589 LL |
2565 | |
2566 | ch = un->un_ch; | |
2567 | if (!ch || ch->magic != DGNC_CHANNEL_MAGIC) | |
8f90ef80 | 2568 | return -ENODEV; |
0b99d589 LL |
2569 | |
2570 | bd = ch->ch_bd; | |
2571 | if (!bd || bd->magic != DGNC_BOARD_MAGIC) | |
8f90ef80 | 2572 | return -ENODEV; |
0b99d589 | 2573 | |
a44b508a | 2574 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2575 | |
2576 | if (un->un_open_count <= 0) { | |
a44b508a | 2577 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2578 | return -EIO; |
0b99d589 LL |
2579 | } |
2580 | ||
2581 | switch (cmd) { | |
0b99d589 LL |
2582 | /* Here are all the standard ioctl's that we MUST implement */ |
2583 | ||
2584 | case TCSBRK: | |
2585 | /* | |
8b07d521 | 2586 | * TCSBRK is SVID version: non-zero arg --> no break |
0b99d589 LL |
2587 | * this behaviour is exploited by tcdrain(). |
2588 | * | |
2589 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be | |
2590 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2591 | * in the middle: 0.375 seconds. | |
2592 | */ | |
2593 | rc = tty_check_change(tty); | |
a44b508a | 2594 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2595 | if (rc) |
8f90ef80 | 2596 | return rc; |
0b99d589 LL |
2597 | |
2598 | rc = ch->ch_bd->bd_ops->drain(tty, 0); | |
2599 | ||
f1e51745 | 2600 | if (rc) |
8f90ef80 | 2601 | return -EINTR; |
0b99d589 | 2602 | |
a44b508a | 2603 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2604 | |
3c4019d3 | 2605 | if (((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP)) |
0b99d589 | 2606 | ch->ch_bd->bd_ops->send_break(ch, 250); |
0b99d589 | 2607 | |
a44b508a | 2608 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2609 | |
8f90ef80 | 2610 | return 0; |
0b99d589 | 2611 | |
0b99d589 | 2612 | case TCSBRKP: |
90d2a471 | 2613 | /* support for POSIX tcsendbreak() |
0b99d589 LL |
2614 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be |
2615 | * between 0.25 and 0.5 seconds so we'll ask for something | |
2616 | * in the middle: 0.375 seconds. | |
2617 | */ | |
2618 | rc = tty_check_change(tty); | |
a44b508a | 2619 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2620 | if (rc) |
8f90ef80 | 2621 | return rc; |
0b99d589 LL |
2622 | |
2623 | rc = ch->ch_bd->bd_ops->drain(tty, 0); | |
f1e51745 | 2624 | if (rc) |
8f90ef80 | 2625 | return -EINTR; |
0b99d589 | 2626 | |
a44b508a | 2627 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2628 | |
2629 | ch->ch_bd->bd_ops->send_break(ch, 250); | |
2630 | ||
a44b508a | 2631 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2632 | |
8f90ef80 | 2633 | return 0; |
0b99d589 LL |
2634 | |
2635 | case TIOCSBRK: | |
2636 | rc = tty_check_change(tty); | |
a44b508a | 2637 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
50667c67 | 2638 | if (rc) |
8f90ef80 | 2639 | return rc; |
0b99d589 LL |
2640 | |
2641 | rc = ch->ch_bd->bd_ops->drain(tty, 0); | |
f1e51745 | 2642 | if (rc) |
8f90ef80 | 2643 | return -EINTR; |
0b99d589 | 2644 | |
a44b508a | 2645 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2646 | |
2647 | ch->ch_bd->bd_ops->send_break(ch, 250); | |
2648 | ||
a44b508a | 2649 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2650 | |
8f90ef80 | 2651 | return 0; |
0b99d589 LL |
2652 | |
2653 | case TIOCCBRK: | |
2654 | /* Do Nothing */ | |
a44b508a | 2655 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2656 | return 0; |
2657 | ||
2658 | case TIOCGSOFTCAR: | |
2659 | ||
a44b508a | 2660 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2661 | |
851f306d | 2662 | rc = put_user(C_CLOCAL(tty) ? 1 : 0, |
6f418259 | 2663 | (unsigned long __user *)arg); |
8f90ef80 | 2664 | return rc; |
0b99d589 LL |
2665 | |
2666 | case TIOCSSOFTCAR: | |
2667 | ||
a44b508a | 2668 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2669 | rc = get_user(arg, (unsigned long __user *)arg); |
0b99d589 | 2670 | if (rc) |
8f90ef80 | 2671 | return rc; |
0b99d589 | 2672 | |
a44b508a | 2673 | spin_lock_irqsave(&ch->ch_lock, flags); |
851f306d CM |
2674 | tty->termios.c_cflag = ((tty->termios.c_cflag & ~CLOCAL) | |
2675 | (arg ? CLOCAL : 0)); | |
0b99d589 | 2676 | ch->ch_bd->bd_ops->param(tty); |
a44b508a | 2677 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2678 | |
8f90ef80 | 2679 | return 0; |
8b07d521 | 2680 | |
0b99d589 | 2681 | case TIOCMGET: |
a44b508a | 2682 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2683 | return dgnc_get_modem_info(ch, uarg); |
0b99d589 LL |
2684 | |
2685 | case TIOCMBIS: | |
2686 | case TIOCMBIC: | |
2687 | case TIOCMSET: | |
a44b508a | 2688 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2689 | return dgnc_set_modem_info(tty, cmd, uarg); |
0b99d589 LL |
2690 | |
2691 | /* | |
2692 | * Here are any additional ioctl's that we want to implement | |
2693 | */ | |
8b07d521 LL |
2694 | |
2695 | case TCFLSH: | |
0b99d589 LL |
2696 | /* |
2697 | * The linux tty driver doesn't have a flush | |
2698 | * input routine for the driver, assuming all backed | |
2699 | * up data is in the line disc. buffers. However, | |
2700 | * we all know that's not the case. Here, we | |
2701 | * act on the ioctl, but then lie and say we didn't | |
2702 | * so the line discipline will process the flush | |
2703 | * also. | |
8b07d521 | 2704 | */ |
0b99d589 LL |
2705 | rc = tty_check_change(tty); |
2706 | if (rc) { | |
a44b508a | 2707 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2708 | return rc; |
0b99d589 LL |
2709 | } |
2710 | ||
2711 | if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) { | |
2712 | ch->ch_r_head = ch->ch_r_tail; | |
2713 | ch->ch_bd->bd_ops->flush_uart_read(ch); | |
2714 | /* Force queue flow control to be released, if needed */ | |
2715 | dgnc_check_queue_flow_control(ch); | |
2716 | } | |
2717 | ||
2718 | if ((arg == TCOFLUSH) || (arg == TCIOFLUSH)) { | |
2719 | if (!(un->un_type == DGNC_PRINT)) { | |
2720 | ch->ch_w_head = ch->ch_w_tail; | |
2721 | ch->ch_bd->bd_ops->flush_uart_write(ch); | |
2722 | ||
2723 | if (ch->ch_tun.un_flags & (UN_LOW|UN_EMPTY)) { | |
851f306d CM |
2724 | ch->ch_tun.un_flags &= |
2725 | ~(UN_LOW|UN_EMPTY); | |
0b99d589 LL |
2726 | wake_up_interruptible(&ch->ch_tun.un_flags_wait); |
2727 | } | |
2728 | ||
2729 | if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) { | |
851f306d CM |
2730 | ch->ch_pun.un_flags &= |
2731 | ~(UN_LOW|UN_EMPTY); | |
0b99d589 LL |
2732 | wake_up_interruptible(&ch->ch_pun.un_flags_wait); |
2733 | } | |
0b99d589 LL |
2734 | } |
2735 | } | |
2736 | ||
8b07d521 | 2737 | /* pretend we didn't recognize this IOCTL */ |
a44b508a | 2738 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2739 | return -ENOIOCTLCMD; |
0b99d589 LL |
2740 | case TCSETSF: |
2741 | case TCSETSW: | |
2742 | /* | |
2743 | * The linux tty driver doesn't have a flush | |
2744 | * input routine for the driver, assuming all backed | |
2745 | * up data is in the line disc. buffers. However, | |
2746 | * we all know that's not the case. Here, we | |
2747 | * act on the ioctl, but then lie and say we didn't | |
2748 | * so the line discipline will process the flush | |
2749 | * also. | |
2750 | */ | |
2751 | if (cmd == TCSETSF) { | |
2752 | /* flush rx */ | |
2753 | ch->ch_flags &= ~CH_STOP; | |
2754 | ch->ch_r_head = ch->ch_r_tail; | |
2755 | ch->ch_bd->bd_ops->flush_uart_read(ch); | |
2756 | /* Force queue flow control to be released, if needed */ | |
2757 | dgnc_check_queue_flow_control(ch); | |
2758 | } | |
2759 | ||
2760 | /* now wait for all the output to drain */ | |
a44b508a | 2761 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2762 | rc = ch->ch_bd->bd_ops->drain(tty, 0); |
f1e51745 | 2763 | if (rc) |
8f90ef80 | 2764 | return -EINTR; |
0b99d589 LL |
2765 | |
2766 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2767 | return -ENOIOCTLCMD; |
0b99d589 LL |
2768 | |
2769 | case TCSETAW: | |
2770 | ||
a44b508a | 2771 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2772 | rc = ch->ch_bd->bd_ops->drain(tty, 0); |
f1e51745 | 2773 | if (rc) |
8f90ef80 | 2774 | return -EINTR; |
0b99d589 LL |
2775 | |
2776 | /* pretend we didn't recognize this */ | |
8f90ef80 | 2777 | return -ENOIOCTLCMD; |
0b99d589 LL |
2778 | |
2779 | case TCXONC: | |
a44b508a | 2780 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2781 | /* Make the ld do it */ |
8f90ef80 | 2782 | return -ENOIOCTLCMD; |
0b99d589 LL |
2783 | |
2784 | case DIGI_GETA: | |
2785 | /* get information for ditty */ | |
a44b508a | 2786 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2787 | return dgnc_tty_digigeta(tty, uarg); |
0b99d589 LL |
2788 | |
2789 | case DIGI_SETAW: | |
2790 | case DIGI_SETAF: | |
2791 | ||
2792 | /* set information for ditty */ | |
2793 | if (cmd == (DIGI_SETAW)) { | |
a44b508a | 2794 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2795 | rc = ch->ch_bd->bd_ops->drain(tty, 0); |
f1e51745 SL |
2796 | |
2797 | if (rc) | |
8f90ef80 | 2798 | return -EINTR; |
f1e51745 | 2799 | |
a44b508a | 2800 | spin_lock_irqsave(&ch->ch_lock, flags); |
2000c581 | 2801 | } else { |
0b99d589 LL |
2802 | tty_ldisc_flush(tty); |
2803 | } | |
2804 | /* fall thru */ | |
2805 | ||
2806 | case DIGI_SETA: | |
a44b508a | 2807 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2808 | return dgnc_tty_digiseta(tty, uarg); |
8b07d521 | 2809 | |
0b99d589 LL |
2810 | case DIGI_LOOPBACK: |
2811 | { | |
2812 | uint loopback = 0; | |
851f306d CM |
2813 | /* Let go of locks when accessing user space, |
2814 | * could sleep | |
2815 | */ | |
a44b508a | 2816 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2817 | rc = get_user(loopback, (unsigned int __user *)arg); |
0b99d589 | 2818 | if (rc) |
8f90ef80 | 2819 | return rc; |
a44b508a | 2820 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2821 | |
8b07d521 | 2822 | /* Enable/disable internal loopback for this port */ |
0b99d589 LL |
2823 | if (loopback) |
2824 | ch->ch_flags |= CH_LOOPBACK; | |
2825 | else | |
2826 | ch->ch_flags &= ~(CH_LOOPBACK); | |
2827 | ||
2828 | ch->ch_bd->bd_ops->param(tty); | |
a44b508a | 2829 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2830 | return 0; |
90d2a471 | 2831 | } |
0b99d589 LL |
2832 | |
2833 | case DIGI_GETCUSTOMBAUD: | |
a44b508a | 2834 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2835 | rc = put_user(ch->ch_custom_speed, (unsigned int __user *)arg); |
8f90ef80 | 2836 | return rc; |
0b99d589 LL |
2837 | |
2838 | case DIGI_SETCUSTOMBAUD: | |
2839 | { | |
93c76c9c | 2840 | int new_rate; |
0b99d589 | 2841 | /* Let go of locks when accessing user space, could sleep */ |
a44b508a | 2842 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2843 | rc = get_user(new_rate, (int __user *)arg); |
0b99d589 | 2844 | if (rc) |
8f90ef80 | 2845 | return rc; |
a44b508a | 2846 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2847 | dgnc_set_custom_speed(ch, new_rate); |
2848 | ch->ch_bd->bd_ops->param(tty); | |
a44b508a | 2849 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2850 | return 0; |
90d2a471 | 2851 | } |
0b99d589 LL |
2852 | |
2853 | /* | |
2854 | * This ioctl allows insertion of a character into the front | |
2855 | * of any pending data to be transmitted. | |
2856 | * | |
2857 | * This ioctl is to satify the "Send Character Immediate" | |
2858 | * call that the RealPort protocol spec requires. | |
2859 | */ | |
2860 | case DIGI_REALPORT_SENDIMMEDIATE: | |
2861 | { | |
2862 | unsigned char c; | |
0eaa02e6 | 2863 | |
a44b508a | 2864 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2865 | rc = get_user(c, (unsigned char __user *)arg); |
0b99d589 | 2866 | if (rc) |
8f90ef80 | 2867 | return rc; |
a44b508a | 2868 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 | 2869 | ch->ch_bd->bd_ops->send_immediate_char(ch, c); |
a44b508a | 2870 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
8f90ef80 | 2871 | return 0; |
0b99d589 LL |
2872 | } |
2873 | ||
2874 | /* | |
2875 | * This ioctl returns all the current counts for the port. | |
2876 | * | |
2877 | * This ioctl is to satify the "Line Error Counters" | |
2878 | * call that the RealPort protocol spec requires. | |
2879 | */ | |
2880 | case DIGI_REALPORT_GETCOUNTERS: | |
2881 | { | |
2882 | struct digi_getcounter buf; | |
2883 | ||
2884 | buf.norun = ch->ch_err_overrun; | |
feba47a7 | 2885 | buf.noflow = 0; /* The driver doesn't keep this stat */ |
0b99d589 LL |
2886 | buf.nframe = ch->ch_err_frame; |
2887 | buf.nparity = ch->ch_err_parity; | |
2888 | buf.nbreak = ch->ch_err_break; | |
2889 | buf.rbytes = ch->ch_rxcount; | |
2890 | buf.tbytes = ch->ch_txcount; | |
2891 | ||
a44b508a | 2892 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2893 | |
50667c67 | 2894 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2895 | return -EFAULT; |
50667c67 | 2896 | |
8f90ef80 | 2897 | return 0; |
0b99d589 LL |
2898 | } |
2899 | ||
2900 | /* | |
2901 | * This ioctl returns all current events. | |
2902 | * | |
2903 | * This ioctl is to satify the "Event Reporting" | |
2904 | * call that the RealPort protocol spec requires. | |
90d2a471 | 2905 | */ |
0b99d589 LL |
2906 | case DIGI_REALPORT_GETEVENTS: |
2907 | { | |
2908 | unsigned int events = 0; | |
2909 | ||
2910 | /* NOTE: MORE EVENTS NEEDS TO BE ADDED HERE */ | |
2911 | if (ch->ch_flags & CH_BREAK_SENDING) | |
2912 | events |= EV_TXB; | |
851f306d CM |
2913 | if ((ch->ch_flags & CH_STOP) || |
2914 | (ch->ch_flags & CH_FORCED_STOP)) | |
0b99d589 | 2915 | events |= (EV_OPU | EV_OPS); |
50667c67 | 2916 | |
851f306d CM |
2917 | if ((ch->ch_flags & CH_STOPI) || |
2918 | (ch->ch_flags & CH_FORCED_STOPI)) | |
0b99d589 | 2919 | events |= (EV_IPU | EV_IPS); |
0b99d589 | 2920 | |
a44b508a | 2921 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
6f418259 | 2922 | rc = put_user(events, (unsigned int __user *)arg); |
8f90ef80 | 2923 | return rc; |
0b99d589 LL |
2924 | } |
2925 | ||
2926 | /* | |
2927 | * This ioctl returns TOUT and TIN counters based | |
2928 | * upon the values passed in by the RealPort Server. | |
2929 | * It also passes back whether the UART Transmitter is | |
2930 | * empty as well. | |
90d2a471 | 2931 | */ |
0b99d589 LL |
2932 | case DIGI_REALPORT_GETBUFFERS: |
2933 | { | |
2934 | struct digi_getbuffer buf; | |
2935 | int tdist; | |
2936 | int count; | |
2937 | ||
a44b508a | 2938 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 LL |
2939 | |
2940 | /* | |
2941 | * Get data from user first. | |
2942 | */ | |
50667c67 | 2943 | if (copy_from_user(&buf, uarg, sizeof(buf))) |
8f90ef80 | 2944 | return -EFAULT; |
0b99d589 | 2945 | |
a44b508a | 2946 | spin_lock_irqsave(&ch->ch_lock, flags); |
0b99d589 LL |
2947 | |
2948 | /* | |
2949 | * Figure out how much data is in our RX and TX queues. | |
2950 | */ | |
2951 | buf.rxbuf = (ch->ch_r_head - ch->ch_r_tail) & RQUEUEMASK; | |
2952 | buf.txbuf = (ch->ch_w_head - ch->ch_w_tail) & WQUEUEMASK; | |
2953 | ||
2954 | /* | |
2955 | * Is the UART empty? Add that value to whats in our TX queue. | |
2956 | */ | |
2957 | count = buf.txbuf + ch->ch_bd->bd_ops->get_uart_bytes_left(ch); | |
2958 | ||
2959 | /* | |
2960 | * Figure out how much data the RealPort Server believes should | |
2961 | * be in our TX queue. | |
2962 | */ | |
2963 | tdist = (buf.tIn - buf.tOut) & 0xffff; | |
2964 | ||
2965 | /* | |
2966 | * If we have more data than the RealPort Server believes we | |
2967 | * should have, reduce our count to its amount. | |
2968 | * | |
2969 | * This count difference CAN happen because the Linux LD can | |
2970 | * insert more characters into our queue for OPOST processing | |
2971 | * that the RealPort Server doesn't know about. | |
2972 | */ | |
50667c67 | 2973 | if (buf.txbuf > tdist) |
0b99d589 | 2974 | buf.txbuf = tdist; |
0b99d589 LL |
2975 | |
2976 | /* | |
2977 | * Report whether our queue and UART TX are completely empty. | |
2978 | */ | |
50667c67 | 2979 | if (count) |
0b99d589 | 2980 | buf.txdone = 0; |
50667c67 | 2981 | else |
0b99d589 | 2982 | buf.txdone = 1; |
0b99d589 | 2983 | |
a44b508a | 2984 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2985 | |
50667c67 | 2986 | if (copy_to_user(uarg, &buf, sizeof(buf))) |
8f90ef80 | 2987 | return -EFAULT; |
50667c67 | 2988 | |
8f90ef80 | 2989 | return 0; |
0b99d589 LL |
2990 | } |
2991 | default: | |
a44b508a | 2992 | spin_unlock_irqrestore(&ch->ch_lock, flags); |
0b99d589 | 2993 | |
8f90ef80 | 2994 | return -ENOIOCTLCMD; |
0b99d589 | 2995 | } |
0b99d589 | 2996 | } |