Blame view
drivers/tty/n_r3964.c
30.7 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 |
/* r3964 linediscipline for linux * * ----------------------------------------------------------- * Copyright by * Philips Automation Projects * Kassel (Germany) |
1da177e4c Linux-2.6.12-rc2 |
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 |
* ----------------------------------------------------------- * This software may be used and distributed according to the terms of * the GNU General Public License, incorporated herein by reference. * * Author: * L. Haag * * $Log: n_r3964.c,v $ * Revision 1.10 2001/03/18 13:02:24 dwmw2 * Fix timer usage, use spinlocks properly. * * Revision 1.9 2001/03/18 12:52:14 dwmw2 * Merge changes in 2.4.2 * * Revision 1.8 2000/03/23 14:14:54 dwmw2 * Fix race in sleeping in r3964_read() * * Revision 1.7 1999/28/08 11:41:50 dwmw2 * Port to 2.3 kernel * * Revision 1.6 1998/09/30 00:40:40 dwmw2 * Fixed compilation on 2.0.x kernels * Updated to newly registered tty-ldisc number 9 * * Revision 1.5 1998/09/04 21:57:36 dwmw2 * Signal handling bug fixes, port to 2.1.x. * * Revision 1.4 1998/04/02 20:26:59 lhaag * select, blocking, ... * * Revision 1.3 1998/02/12 18:58:43 root * fixed some memory leaks * calculation of checksum characters * * Revision 1.2 1998/02/07 13:03:34 root * ioctl read_telegram * * Revision 1.1 1998/02/06 19:21:03 root * Initial revision * * */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/types.h> #include <linux/fcntl.h> #include <linux/interrupt.h> #include <linux/ptrace.h> #include <linux/ioport.h> #include <linux/in.h> #include <linux/slab.h> #include <linux/tty.h> #include <linux/errno.h> |
5e07e1ccb [PATCH] Char: n_r... |
62 63 |
#include <linux/string.h> /* used in new tty drivers */ #include <linux/signal.h> /* used in new tty drivers */ |
1da177e4c Linux-2.6.12-rc2 |
64 65 66 67 68 |
#include <linux/ioctl.h> #include <linux/n_r3964.h> #include <linux/poll.h> #include <linux/init.h> #include <asm/uaccess.h> |
5e07e1ccb [PATCH] Char: n_r... |
69 |
/*#define DEBUG_QUEUE*/ |
1da177e4c Linux-2.6.12-rc2 |
70 71 |
/* Log successful handshake and protocol operations */ |
5e07e1ccb [PATCH] Char: n_r... |
72 |
/*#define DEBUG_PROTO_S*/ |
1da177e4c Linux-2.6.12-rc2 |
73 74 |
/* Log handshake and protocol errors: */ |
5e07e1ccb [PATCH] Char: n_r... |
75 |
/*#define DEBUG_PROTO_E*/ |
1da177e4c Linux-2.6.12-rc2 |
76 77 |
/* Log Linediscipline operations (open, close, read, write...): */ |
5e07e1ccb [PATCH] Char: n_r... |
78 |
/*#define DEBUG_LDISC*/ |
1da177e4c Linux-2.6.12-rc2 |
79 80 |
/* Log module and memory operations (init, cleanup; kmalloc, kfree): */ |
5e07e1ccb [PATCH] Char: n_r... |
81 |
/*#define DEBUG_MODUL*/ |
1da177e4c Linux-2.6.12-rc2 |
82 83 |
/* Macro helpers for debug output: */ |
5e07e1ccb [PATCH] Char: n_r... |
84 85 |
#define TRACE(format, args...) printk("r3964: " format " " , ## args) |
1da177e4c Linux-2.6.12-rc2 |
86 87 |
#ifdef DEBUG_MODUL |
5e07e1ccb [PATCH] Char: n_r... |
88 89 |
#define TRACE_M(format, args...) printk("r3964: " format " " , ## args) |
1da177e4c Linux-2.6.12-rc2 |
90 |
#else |
5e07e1ccb [PATCH] Char: n_r... |
91 |
#define TRACE_M(fmt, arg...) do {} while (0) |
1da177e4c Linux-2.6.12-rc2 |
92 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
93 |
#ifdef DEBUG_PROTO_S |
5e07e1ccb [PATCH] Char: n_r... |
94 95 |
#define TRACE_PS(format, args...) printk("r3964: " format " " , ## args) |
1da177e4c Linux-2.6.12-rc2 |
96 |
#else |
5e07e1ccb [PATCH] Char: n_r... |
97 |
#define TRACE_PS(fmt, arg...) do {} while (0) |
1da177e4c Linux-2.6.12-rc2 |
98 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
99 |
#ifdef DEBUG_PROTO_E |
5e07e1ccb [PATCH] Char: n_r... |
100 101 |
#define TRACE_PE(format, args...) printk("r3964: " format " " , ## args) |
1da177e4c Linux-2.6.12-rc2 |
102 |
#else |
5e07e1ccb [PATCH] Char: n_r... |
103 |
#define TRACE_PE(fmt, arg...) do {} while (0) |
1da177e4c Linux-2.6.12-rc2 |
104 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
105 |
#ifdef DEBUG_LDISC |
5e07e1ccb [PATCH] Char: n_r... |
106 107 |
#define TRACE_L(format, args...) printk("r3964: " format " " , ## args) |
1da177e4c Linux-2.6.12-rc2 |
108 |
#else |
5e07e1ccb [PATCH] Char: n_r... |
109 |
#define TRACE_L(fmt, arg...) do {} while (0) |
1da177e4c Linux-2.6.12-rc2 |
110 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
111 |
#ifdef DEBUG_QUEUE |
5e07e1ccb [PATCH] Char: n_r... |
112 113 |
#define TRACE_Q(format, args...) printk("r3964: " format " " , ## args) |
1da177e4c Linux-2.6.12-rc2 |
114 |
#else |
5e07e1ccb [PATCH] Char: n_r... |
115 |
#define TRACE_Q(fmt, arg...) do {} while (0) |
1da177e4c Linux-2.6.12-rc2 |
116 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
117 118 119 120 121 122 123 124 125 |
static void add_tx_queue(struct r3964_info *, struct r3964_block_header *); static void remove_from_tx_queue(struct r3964_info *pInfo, int error_code); static void put_char(struct r3964_info *pInfo, unsigned char ch); static void trigger_transmit(struct r3964_info *pInfo); static void retry_transmit(struct r3964_info *pInfo); static void transmit_block(struct r3964_info *pInfo); static void receive_char(struct r3964_info *pInfo, const unsigned char c); static void receive_error(struct r3964_info *pInfo, const char flag); static void on_timeout(unsigned long priv); |
3cec556a8 [PATCH] n_r3964: ... |
126 |
static int enable_signals(struct r3964_info *pInfo, struct pid *pid, int arg); |
5e07e1ccb [PATCH] Char: n_r... |
127 128 |
static int read_telegram(struct r3964_info *pInfo, struct pid *pid, unsigned char __user * buf); |
1da177e4c Linux-2.6.12-rc2 |
129 |
static void add_msg(struct r3964_client_info *pClient, int msg_id, int arg, |
5e07e1ccb [PATCH] Char: n_r... |
130 131 132 133 134 |
int error_code, struct r3964_block_header *pBlock); static struct r3964_message *remove_msg(struct r3964_info *pInfo, struct r3964_client_info *pClient); static void remove_client_block(struct r3964_info *pInfo, struct r3964_client_info *pClient); |
1da177e4c Linux-2.6.12-rc2 |
135 |
|
5e07e1ccb [PATCH] Char: n_r... |
136 |
static int r3964_open(struct tty_struct *tty); |
1da177e4c Linux-2.6.12-rc2 |
137 138 |
static void r3964_close(struct tty_struct *tty); static ssize_t r3964_read(struct tty_struct *tty, struct file *file, |
5e07e1ccb [PATCH] Char: n_r... |
139 140 141 142 143 144 145 146 |
unsigned char __user * buf, size_t nr); static ssize_t r3964_write(struct tty_struct *tty, struct file *file, const unsigned char *buf, size_t nr); static int r3964_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg); static void r3964_set_termios(struct tty_struct *tty, struct ktermios *old); static unsigned int r3964_poll(struct tty_struct *tty, struct file *file, struct poll_table_struct *wait); |
55db4c64e Revert "tty: make... |
147 148 |
static void r3964_receive_buf(struct tty_struct *tty, const unsigned char *cp, char *fp, int count); |
1da177e4c Linux-2.6.12-rc2 |
149 |
|
a352def21 tty: Ldisc revamp |
150 |
static struct tty_ldisc_ops tty_ldisc_N_R3964 = { |
5e07e1ccb [PATCH] Char: n_r... |
151 152 153 154 155 156 157 158 |
.owner = THIS_MODULE, .magic = TTY_LDISC_MAGIC, .name = "R3964", .open = r3964_open, .close = r3964_close, .read = r3964_read, .write = r3964_write, .ioctl = r3964_ioctl, |
1da177e4c Linux-2.6.12-rc2 |
159 |
.set_termios = r3964_set_termios, |
5e07e1ccb [PATCH] Char: n_r... |
160 |
.poll = r3964_poll, |
1da177e4c Linux-2.6.12-rc2 |
161 |
.receive_buf = r3964_receive_buf, |
1da177e4c Linux-2.6.12-rc2 |
162 |
}; |
1da177e4c Linux-2.6.12-rc2 |
163 164 |
static void dump_block(const unsigned char *block, unsigned int length) { |
5e07e1ccb [PATCH] Char: n_r... |
165 166 167 168 169 170 171 172 173 174 |
unsigned int i, j; char linebuf[16 * 3 + 1]; for (i = 0; i < length; i += 16) { for (j = 0; (j < 16) && (j + i < length); j++) { sprintf(linebuf + 3 * j, "%02x ", block[i + j]); } linebuf[3 * j] = '\0'; TRACE_PS("%s", linebuf); } |
1da177e4c Linux-2.6.12-rc2 |
175 |
} |
1da177e4c Linux-2.6.12-rc2 |
176 177 178 |
/************************************************************* * Driver initialisation *************************************************************/ |
1da177e4c Linux-2.6.12-rc2 |
179 180 181 182 183 184 |
/************************************************************* * Module support routines *************************************************************/ static void __exit r3964_exit(void) { |
5e07e1ccb [PATCH] Char: n_r... |
185 186 187 188 189 190 191 192 193 194 195 196 197 |
int status; TRACE_M("cleanup_module()"); status = tty_unregister_ldisc(N_R3964); if (status != 0) { printk(KERN_ERR "r3964: error unregistering linediscipline: " "%d ", status); } else { TRACE_L("linediscipline successfully unregistered"); } |
1da177e4c Linux-2.6.12-rc2 |
198 199 200 201 |
} static int __init r3964_init(void) { |
5e07e1ccb [PATCH] Char: n_r... |
202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 |
int status; printk("r3964: Philips r3964 Driver $Revision: 1.10 $ "); /* * Register the tty line discipline */ status = tty_register_ldisc(N_R3964, &tty_ldisc_N_R3964); if (status == 0) { TRACE_L("line discipline %d registered", N_R3964); TRACE_L("flags=%x num=%x", tty_ldisc_N_R3964.flags, tty_ldisc_N_R3964.num); TRACE_L("open=%p", tty_ldisc_N_R3964.open); TRACE_L("tty_ldisc_N_R3964 = %p", &tty_ldisc_N_R3964); } else { printk(KERN_ERR "r3964: error registering line discipline: " "%d ", status); } return status; |
1da177e4c Linux-2.6.12-rc2 |
224 225 226 227 |
} module_init(r3964_init); module_exit(r3964_exit); |
1da177e4c Linux-2.6.12-rc2 |
228 229 230 |
/************************************************************* * Protocol implementation routines *************************************************************/ |
5e07e1ccb [PATCH] Char: n_r... |
231 232 |
static void add_tx_queue(struct r3964_info *pInfo, struct r3964_block_header *pHeader) |
1da177e4c Linux-2.6.12-rc2 |
233 |
{ |
5e07e1ccb [PATCH] Char: n_r... |
234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 |
unsigned long flags; spin_lock_irqsave(&pInfo->lock, flags); pHeader->next = NULL; if (pInfo->tx_last == NULL) { pInfo->tx_first = pInfo->tx_last = pHeader; } else { pInfo->tx_last->next = pHeader; pInfo->tx_last = pHeader; } spin_unlock_irqrestore(&pInfo->lock, flags); TRACE_Q("add_tx_queue %p, length %d, tx_first = %p", pHeader, pHeader->length, pInfo->tx_first); |
1da177e4c Linux-2.6.12-rc2 |
251 252 253 254 |
} static void remove_from_tx_queue(struct r3964_info *pInfo, int error_code) { |
5e07e1ccb [PATCH] Char: n_r... |
255 256 |
struct r3964_block_header *pHeader; unsigned long flags; |
1da177e4c Linux-2.6.12-rc2 |
257 |
#ifdef DEBUG_QUEUE |
5e07e1ccb [PATCH] Char: n_r... |
258 |
struct r3964_block_header *pDump; |
1da177e4c Linux-2.6.12-rc2 |
259 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
260 |
|
5e07e1ccb [PATCH] Char: n_r... |
261 262 263 264 |
pHeader = pInfo->tx_first; if (pHeader == NULL) return; |
1da177e4c Linux-2.6.12-rc2 |
265 266 |
#ifdef DEBUG_QUEUE |
5e07e1ccb [PATCH] Char: n_r... |
267 268 269 270 271 272 |
printk("r3964: remove_from_tx_queue: %p, length %u - ", pHeader, pHeader->length); for (pDump = pHeader; pDump; pDump = pDump->next) printk("%p ", pDump); printk(" "); |
1da177e4c Linux-2.6.12-rc2 |
273 |
#endif |
5e07e1ccb [PATCH] Char: n_r... |
274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 |
if (pHeader->owner) { if (error_code) { add_msg(pHeader->owner, R3964_MSG_ACK, 0, error_code, NULL); } else { add_msg(pHeader->owner, R3964_MSG_ACK, pHeader->length, error_code, NULL); } wake_up_interruptible(&pInfo->read_wait); } spin_lock_irqsave(&pInfo->lock, flags); pInfo->tx_first = pHeader->next; if (pInfo->tx_first == NULL) { pInfo->tx_last = NULL; } spin_unlock_irqrestore(&pInfo->lock, flags); kfree(pHeader); TRACE_M("remove_from_tx_queue - kfree %p", pHeader); |
1da177e4c Linux-2.6.12-rc2 |
296 |
|
5e07e1ccb [PATCH] Char: n_r... |
297 298 |
TRACE_Q("remove_from_tx_queue: tx_first = %p, tx_last = %p", pInfo->tx_first, pInfo->tx_last); |
1da177e4c Linux-2.6.12-rc2 |
299 |
} |
5e07e1ccb [PATCH] Char: n_r... |
300 301 |
static void add_rx_queue(struct r3964_info *pInfo, struct r3964_block_header *pHeader) |
1da177e4c Linux-2.6.12-rc2 |
302 |
{ |
5e07e1ccb [PATCH] Char: n_r... |
303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 |
unsigned long flags; spin_lock_irqsave(&pInfo->lock, flags); pHeader->next = NULL; if (pInfo->rx_last == NULL) { pInfo->rx_first = pInfo->rx_last = pHeader; } else { pInfo->rx_last->next = pHeader; pInfo->rx_last = pHeader; } pInfo->blocks_in_rx_queue++; spin_unlock_irqrestore(&pInfo->lock, flags); TRACE_Q("add_rx_queue: %p, length = %d, rx_first = %p, count = %d", pHeader, pHeader->length, pInfo->rx_first, pInfo->blocks_in_rx_queue); |
1da177e4c Linux-2.6.12-rc2 |
322 323 324 |
} static void remove_from_rx_queue(struct r3964_info *pInfo, |
5e07e1ccb [PATCH] Char: n_r... |
325 |
struct r3964_block_header *pHeader) |
1da177e4c Linux-2.6.12-rc2 |
326 |
{ |
5e07e1ccb [PATCH] Char: n_r... |
327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 |
unsigned long flags; struct r3964_block_header *pFind; if (pHeader == NULL) return; TRACE_Q("remove_from_rx_queue: rx_first = %p, rx_last = %p, count = %d", pInfo->rx_first, pInfo->rx_last, pInfo->blocks_in_rx_queue); TRACE_Q("remove_from_rx_queue: %p, length %u", pHeader, pHeader->length); spin_lock_irqsave(&pInfo->lock, flags); if (pInfo->rx_first == pHeader) { /* Remove the first block in the linked list: */ pInfo->rx_first = pHeader->next; if (pInfo->rx_first == NULL) { pInfo->rx_last = NULL; } pInfo->blocks_in_rx_queue--; } else { /* Find block to remove: */ for (pFind = pInfo->rx_first; pFind; pFind = pFind->next) { if (pFind->next == pHeader) { /* Got it. */ pFind->next = pHeader->next; pInfo->blocks_in_rx_queue--; if (pFind->next == NULL) { /* Oh, removed the last one! */ pInfo->rx_last = pFind; } break; } } } spin_unlock_irqrestore(&pInfo->lock, flags); kfree(pHeader); TRACE_M("remove_from_rx_queue - kfree %p", pHeader); TRACE_Q("remove_from_rx_queue: rx_first = %p, rx_last = %p, count = %d", pInfo->rx_first, pInfo->rx_last, pInfo->blocks_in_rx_queue); |
1da177e4c Linux-2.6.12-rc2 |
371 372 373 374 |
} static void put_char(struct r3964_info *pInfo, unsigned char ch) { |
5e07e1ccb [PATCH] Char: n_r... |
375 |
struct tty_struct *tty = pInfo->tty; |
f34d7a5b7 tty: The big oper... |
376 |
/* FIXME: put_char should not be called from an IRQ */ |
51383f69e tty: Remove lots ... |
377 |
tty_put_char(tty, ch); |
5e07e1ccb [PATCH] Char: n_r... |
378 |
pInfo->bcc ^= ch; |
1da177e4c Linux-2.6.12-rc2 |
379 380 381 382 |
} static void flush(struct r3964_info *pInfo) { |
5e07e1ccb [PATCH] Char: n_r... |
383 |
struct tty_struct *tty = pInfo->tty; |
1da177e4c Linux-2.6.12-rc2 |
384 |
|
f34d7a5b7 tty: The big oper... |
385 |
if (tty == NULL || tty->ops->flush_chars == NULL) |
5e07e1ccb [PATCH] Char: n_r... |
386 |
return; |
f34d7a5b7 tty: The big oper... |
387 |
tty->ops->flush_chars(tty); |
1da177e4c Linux-2.6.12-rc2 |
388 389 390 391 |
} static void trigger_transmit(struct r3964_info *pInfo) { |
5e07e1ccb [PATCH] Char: n_r... |
392 |
unsigned long flags; |
1da177e4c Linux-2.6.12-rc2 |
393 |
|
5e07e1ccb [PATCH] Char: n_r... |
394 |
spin_lock_irqsave(&pInfo->lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
395 |
|
5e07e1ccb [PATCH] Char: n_r... |
396 397 398 399 400 |
if ((pInfo->state == R3964_IDLE) && (pInfo->tx_first != NULL)) { pInfo->state = R3964_TX_REQUEST; pInfo->nRetry = 0; pInfo->flags &= ~R3964_ERROR; mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ); |
1da177e4c Linux-2.6.12-rc2 |
401 |
|
5e07e1ccb [PATCH] Char: n_r... |
402 |
spin_unlock_irqrestore(&pInfo->lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
403 |
|
5e07e1ccb [PATCH] Char: n_r... |
404 |
TRACE_PS("trigger_transmit - sent STX"); |
1da177e4c Linux-2.6.12-rc2 |
405 |
|
5e07e1ccb [PATCH] Char: n_r... |
406 407 |
put_char(pInfo, STX); flush(pInfo); |
1da177e4c Linux-2.6.12-rc2 |
408 |
|
5e07e1ccb [PATCH] Char: n_r... |
409 410 411 412 |
pInfo->bcc = 0; } else { spin_unlock_irqrestore(&pInfo->lock, flags); } |
1da177e4c Linux-2.6.12-rc2 |
413 414 415 416 |
} static void retry_transmit(struct r3964_info *pInfo) { |
5e07e1ccb [PATCH] Char: n_r... |
417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 |
if (pInfo->nRetry < R3964_MAX_RETRIES) { TRACE_PE("transmission failed. Retry #%d", pInfo->nRetry); pInfo->bcc = 0; put_char(pInfo, STX); flush(pInfo); pInfo->state = R3964_TX_REQUEST; pInfo->nRetry++; mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ); } else { TRACE_PE("transmission failed after %d retries", R3964_MAX_RETRIES); remove_from_tx_queue(pInfo, R3964_TX_FAIL); put_char(pInfo, NAK); flush(pInfo); pInfo->state = R3964_IDLE; trigger_transmit(pInfo); } |
1da177e4c Linux-2.6.12-rc2 |
437 |
} |
1da177e4c Linux-2.6.12-rc2 |
438 439 |
static void transmit_block(struct r3964_info *pInfo) { |
5e07e1ccb [PATCH] Char: n_r... |
440 441 442 |
struct tty_struct *tty = pInfo->tty; struct r3964_block_header *pBlock = pInfo->tx_first; int room = 0; |
f34d7a5b7 tty: The big oper... |
443 |
if (tty == NULL || pBlock == NULL) { |
5e07e1ccb [PATCH] Char: n_r... |
444 445 |
return; } |
f34d7a5b7 tty: The big oper... |
446 |
room = tty_write_room(tty); |
5e07e1ccb [PATCH] Char: n_r... |
447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 |
TRACE_PS("transmit_block %p, room %d, length %d", pBlock, room, pBlock->length); while (pInfo->tx_position < pBlock->length) { if (room < 2) break; if (pBlock->data[pInfo->tx_position] == DLE) { /* send additional DLE char: */ put_char(pInfo, DLE); } put_char(pInfo, pBlock->data[pInfo->tx_position++]); room--; } if ((pInfo->tx_position == pBlock->length) && (room >= 3)) { put_char(pInfo, DLE); put_char(pInfo, ETX); if (pInfo->flags & R3964_BCC) { put_char(pInfo, pInfo->bcc); } pInfo->state = R3964_WAIT_FOR_TX_ACK; mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ); } flush(pInfo); |
1da177e4c Linux-2.6.12-rc2 |
474 475 476 477 |
} static void on_receive_block(struct r3964_info *pInfo) { |
5e07e1ccb [PATCH] Char: n_r... |
478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 |
unsigned int length; struct r3964_client_info *pClient; struct r3964_block_header *pBlock; length = pInfo->rx_position; /* compare byte checksum characters: */ if (pInfo->flags & R3964_BCC) { if (pInfo->bcc != pInfo->last_rx) { TRACE_PE("checksum error - got %x but expected %x", pInfo->last_rx, pInfo->bcc); pInfo->flags |= R3964_CHECKSUM; } } /* check for errors (parity, overrun,...): */ if (pInfo->flags & R3964_ERROR) { TRACE_PE("on_receive_block - transmission failed error %x", pInfo->flags & R3964_ERROR); put_char(pInfo, NAK); flush(pInfo); if (pInfo->nRetry < R3964_MAX_RETRIES) { pInfo->state = R3964_WAIT_FOR_RX_REPEAT; pInfo->nRetry++; mod_timer(&pInfo->tmr, jiffies + R3964_TO_RX_PANIC); } else { TRACE_PE("on_receive_block - failed after max retries"); pInfo->state = R3964_IDLE; } return; } /* received block; submit DLE: */ put_char(pInfo, DLE); flush(pInfo); del_timer_sync(&pInfo->tmr); TRACE_PS(" rx success: got %d chars", length); /* prepare struct r3964_block_header: */ pBlock = kmalloc(length + sizeof(struct r3964_block_header), GFP_KERNEL); TRACE_M("on_receive_block - kmalloc %p", pBlock); if (pBlock == NULL) return; pBlock->length = length; pBlock->data = ((unsigned char *)pBlock) + sizeof(struct r3964_block_header); pBlock->locks = 0; pBlock->next = NULL; pBlock->owner = NULL; memcpy(pBlock->data, pInfo->rx_buf, length); /* queue block into rx_queue: */ add_rx_queue(pInfo, pBlock); /* notify attached client processes: */ for (pClient = pInfo->firstClient; pClient; pClient = pClient->next) { if (pClient->sig_flags & R3964_SIG_DATA) { add_msg(pClient, R3964_MSG_DATA, length, R3964_OK, pBlock); } } wake_up_interruptible(&pInfo->read_wait); |
1da177e4c Linux-2.6.12-rc2 |
545 |
|
5e07e1ccb [PATCH] Char: n_r... |
546 547 548 549 |
pInfo->state = R3964_IDLE; trigger_transmit(pInfo); } |
1da177e4c Linux-2.6.12-rc2 |
550 551 552 |
static void receive_char(struct r3964_info *pInfo, const unsigned char c) { |
5e07e1ccb [PATCH] Char: n_r... |
553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 |
switch (pInfo->state) { case R3964_TX_REQUEST: if (c == DLE) { TRACE_PS("TX_REQUEST - got DLE"); pInfo->state = R3964_TRANSMITTING; pInfo->tx_position = 0; transmit_block(pInfo); } else if (c == STX) { if (pInfo->nRetry == 0) { TRACE_PE("TX_REQUEST - init conflict"); if (pInfo->priority == R3964_SLAVE) { goto start_receiving; } } else { TRACE_PE("TX_REQUEST - secondary init " "conflict!? Switching to SLAVE mode " "for next rx."); goto start_receiving; } } else { TRACE_PE("TX_REQUEST - char != DLE: %x", c); retry_transmit(pInfo); } break; case R3964_TRANSMITTING: if (c == NAK) { TRACE_PE("TRANSMITTING - got NAK"); retry_transmit(pInfo); } else { TRACE_PE("TRANSMITTING - got invalid char"); pInfo->state = R3964_WAIT_ZVZ_BEFORE_TX_RETRY; mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ); } break; case R3964_WAIT_FOR_TX_ACK: if (c == DLE) { TRACE_PS("WAIT_FOR_TX_ACK - got DLE"); remove_from_tx_queue(pInfo, R3964_OK); pInfo->state = R3964_IDLE; trigger_transmit(pInfo); } else { retry_transmit(pInfo); } break; case R3964_WAIT_FOR_RX_REPEAT: |
af901ca18 tree-wide: fix as... |
602 |
/* FALLTHROUGH */ |
5e07e1ccb [PATCH] Char: n_r... |
603 604 605 606 607 608 609 610 611 612 613 614 |
case R3964_IDLE: if (c == STX) { /* Prevent rx_queue from overflow: */ if (pInfo->blocks_in_rx_queue >= R3964_MAX_BLOCKS_IN_RX_QUEUE) { TRACE_PE("IDLE - got STX but no space in " "rx_queue!"); pInfo->state = R3964_WAIT_FOR_RX_BUF; mod_timer(&pInfo->tmr, jiffies + R3964_TO_NO_BUF); break; } |
1da177e4c Linux-2.6.12-rc2 |
615 |
start_receiving: |
5e07e1ccb [PATCH] Char: n_r... |
616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 |
/* Ok, start receiving: */ TRACE_PS("IDLE - got STX"); pInfo->rx_position = 0; pInfo->last_rx = 0; pInfo->flags &= ~R3964_ERROR; pInfo->state = R3964_RECEIVING; mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ); pInfo->nRetry = 0; put_char(pInfo, DLE); flush(pInfo); pInfo->bcc = 0; } break; case R3964_RECEIVING: if (pInfo->rx_position < RX_BUF_SIZE) { pInfo->bcc ^= c; if (c == DLE) { if (pInfo->last_rx == DLE) { pInfo->last_rx = 0; goto char_to_buf; } pInfo->last_rx = DLE; break; } else if ((c == ETX) && (pInfo->last_rx == DLE)) { if (pInfo->flags & R3964_BCC) { pInfo->state = R3964_WAIT_FOR_BCC; mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ); } else { on_receive_block(pInfo); } } else { pInfo->last_rx = c; |
1da177e4c Linux-2.6.12-rc2 |
650 |
char_to_buf: |
5e07e1ccb [PATCH] Char: n_r... |
651 652 653 654 655 656 657 658 659 660 661 |
pInfo->rx_buf[pInfo->rx_position++] = c; mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ); } } /* else: overflow-msg? BUF_SIZE>MTU; should not happen? */ break; case R3964_WAIT_FOR_BCC: pInfo->last_rx = c; on_receive_block(pInfo); break; } |
1da177e4c Linux-2.6.12-rc2 |
662 663 664 665 |
} static void receive_error(struct r3964_info *pInfo, const char flag) { |
5e07e1ccb [PATCH] Char: n_r... |
666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 |
switch (flag) { case TTY_NORMAL: break; case TTY_BREAK: TRACE_PE("received break"); pInfo->flags |= R3964_BREAK; break; case TTY_PARITY: TRACE_PE("parity error"); pInfo->flags |= R3964_PARITY; break; case TTY_FRAME: TRACE_PE("frame error"); pInfo->flags |= R3964_FRAME; break; case TTY_OVERRUN: TRACE_PE("frame overrun"); pInfo->flags |= R3964_OVERRUN; break; default: TRACE_PE("receive_error - unknown flag %d", flag); pInfo->flags |= R3964_UNKNOWN; break; } |
1da177e4c Linux-2.6.12-rc2 |
690 691 692 693 |
} static void on_timeout(unsigned long priv) { |
5e07e1ccb [PATCH] Char: n_r... |
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 |
struct r3964_info *pInfo = (void *)priv; switch (pInfo->state) { case R3964_TX_REQUEST: TRACE_PE("TX_REQUEST - timeout"); retry_transmit(pInfo); break; case R3964_WAIT_ZVZ_BEFORE_TX_RETRY: put_char(pInfo, NAK); flush(pInfo); retry_transmit(pInfo); break; case R3964_WAIT_FOR_TX_ACK: TRACE_PE("WAIT_FOR_TX_ACK - timeout"); retry_transmit(pInfo); break; case R3964_WAIT_FOR_RX_BUF: TRACE_PE("WAIT_FOR_RX_BUF - timeout"); put_char(pInfo, NAK); flush(pInfo); pInfo->state = R3964_IDLE; break; case R3964_RECEIVING: TRACE_PE("RECEIVING - timeout after %d chars", pInfo->rx_position); put_char(pInfo, NAK); flush(pInfo); pInfo->state = R3964_IDLE; break; case R3964_WAIT_FOR_RX_REPEAT: TRACE_PE("WAIT_FOR_RX_REPEAT - timeout"); pInfo->state = R3964_IDLE; break; case R3964_WAIT_FOR_BCC: TRACE_PE("WAIT_FOR_BCC - timeout"); put_char(pInfo, NAK); flush(pInfo); pInfo->state = R3964_IDLE; break; } |
1da177e4c Linux-2.6.12-rc2 |
734 |
} |
5e07e1ccb [PATCH] Char: n_r... |
735 736 |
static struct r3964_client_info *findClient(struct r3964_info *pInfo, struct pid *pid) |
1da177e4c Linux-2.6.12-rc2 |
737 |
{ |
5e07e1ccb [PATCH] Char: n_r... |
738 739 740 741 742 743 744 745 |
struct r3964_client_info *pClient; for (pClient = pInfo->firstClient; pClient; pClient = pClient->next) { if (pClient->pid == pid) { return pClient; } } return NULL; |
1da177e4c Linux-2.6.12-rc2 |
746 |
} |
3cec556a8 [PATCH] n_r3964: ... |
747 |
static int enable_signals(struct r3964_info *pInfo, struct pid *pid, int arg) |
1da177e4c Linux-2.6.12-rc2 |
748 |
{ |
5e07e1ccb [PATCH] Char: n_r... |
749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 |
struct r3964_client_info *pClient; struct r3964_client_info **ppClient; struct r3964_message *pMsg; if ((arg & R3964_SIG_ALL) == 0) { /* Remove client from client list */ for (ppClient = &pInfo->firstClient; *ppClient; ppClient = &(*ppClient)->next) { pClient = *ppClient; if (pClient->pid == pid) { TRACE_PS("removing client %d from client list", pid_nr(pid)); *ppClient = pClient->next; while (pClient->msg_count) { pMsg = remove_msg(pInfo, pClient); if (pMsg) { kfree(pMsg); TRACE_M("enable_signals - msg " "kfree %p", pMsg); } } put_pid(pClient->pid); kfree(pClient); TRACE_M("enable_signals - kfree %p", pClient); return 0; } } return -EINVAL; } else { pClient = findClient(pInfo, pid); if (pClient) { /* update signal options */ pClient->sig_flags = arg; } else { /* add client to client list */ pClient = kmalloc(sizeof(struct r3964_client_info), GFP_KERNEL); TRACE_M("enable_signals - kmalloc %p", pClient); if (pClient == NULL) return -ENOMEM; TRACE_PS("add client %d to client list", pid_nr(pid)); spin_lock_init(&pClient->lock); pClient->sig_flags = arg; pClient->pid = get_pid(pid); pClient->next = pInfo->firstClient; pClient->first_msg = NULL; pClient->last_msg = NULL; pClient->next_block_to_read = NULL; pClient->msg_count = 0; pInfo->firstClient = pClient; } } return 0; |
1da177e4c Linux-2.6.12-rc2 |
805 |
} |
5e07e1ccb [PATCH] Char: n_r... |
806 807 |
static int read_telegram(struct r3964_info *pInfo, struct pid *pid, unsigned char __user * buf) |
1da177e4c Linux-2.6.12-rc2 |
808 |
{ |
5e07e1ccb [PATCH] Char: n_r... |
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 |
struct r3964_client_info *pClient; struct r3964_block_header *block; if (!buf) { return -EINVAL; } pClient = findClient(pInfo, pid); if (pClient == NULL) { return -EINVAL; } block = pClient->next_block_to_read; if (!block) { return 0; } else { if (copy_to_user(buf, block->data, block->length)) return -EFAULT; remove_client_block(pInfo, pClient); return block->length; } return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
833 834 835 |
} static void add_msg(struct r3964_client_info *pClient, int msg_id, int arg, |
5e07e1ccb [PATCH] Char: n_r... |
836 |
int error_code, struct r3964_block_header *pBlock) |
1da177e4c Linux-2.6.12-rc2 |
837 |
{ |
5e07e1ccb [PATCH] Char: n_r... |
838 839 840 841 |
struct r3964_message *pMsg; unsigned long flags; if (pClient->msg_count < R3964_MAX_MSG_COUNT - 1) { |
1da177e4c Linux-2.6.12-rc2 |
842 |
queue_the_message: |
5e07e1ccb [PATCH] Char: n_r... |
843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 |
pMsg = kmalloc(sizeof(struct r3964_message), error_code ? GFP_ATOMIC : GFP_KERNEL); TRACE_M("add_msg - kmalloc %p", pMsg); if (pMsg == NULL) { return; } spin_lock_irqsave(&pClient->lock, flags); pMsg->msg_id = msg_id; pMsg->arg = arg; pMsg->error_code = error_code; pMsg->block = pBlock; pMsg->next = NULL; if (pClient->last_msg == NULL) { pClient->first_msg = pClient->last_msg = pMsg; } else { pClient->last_msg->next = pMsg; pClient->last_msg = pMsg; } pClient->msg_count++; if (pBlock != NULL) { pBlock->locks++; } spin_unlock_irqrestore(&pClient->lock, flags); } else { if ((pClient->last_msg->msg_id == R3964_MSG_ACK) && (pClient->last_msg->error_code == R3964_OVERFLOW)) { pClient->last_msg->arg++; TRACE_PE("add_msg - inc prev OVERFLOW-msg"); } else { msg_id = R3964_MSG_ACK; arg = 0; error_code = R3964_OVERFLOW; pBlock = NULL; TRACE_PE("add_msg - queue OVERFLOW-msg"); goto queue_the_message; } } /* Send SIGIO signal to client process: */ if (pClient->sig_flags & R3964_USE_SIGIO) { kill_pid(pClient->pid, SIGIO, 1); } |
1da177e4c Linux-2.6.12-rc2 |
889 890 891 |
} static struct r3964_message *remove_msg(struct r3964_info *pInfo, |
5e07e1ccb [PATCH] Char: n_r... |
892 |
struct r3964_client_info *pClient) |
1da177e4c Linux-2.6.12-rc2 |
893 |
{ |
5e07e1ccb [PATCH] Char: n_r... |
894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 |
struct r3964_message *pMsg = NULL; unsigned long flags; if (pClient->first_msg) { spin_lock_irqsave(&pClient->lock, flags); pMsg = pClient->first_msg; pClient->first_msg = pMsg->next; if (pClient->first_msg == NULL) { pClient->last_msg = NULL; } pClient->msg_count--; if (pMsg->block) { remove_client_block(pInfo, pClient); pClient->next_block_to_read = pMsg->block; } spin_unlock_irqrestore(&pClient->lock, flags); } return pMsg; |
1da177e4c Linux-2.6.12-rc2 |
914 |
} |
5e07e1ccb [PATCH] Char: n_r... |
915 916 |
static void remove_client_block(struct r3964_info *pInfo, struct r3964_client_info *pClient) |
1da177e4c Linux-2.6.12-rc2 |
917 |
{ |
5e07e1ccb [PATCH] Char: n_r... |
918 919 920 |
struct r3964_block_header *block; TRACE_PS("remove_client_block PID %d", pid_nr(pClient->pid)); |
1da177e4c Linux-2.6.12-rc2 |
921 |
|
5e07e1ccb [PATCH] Char: n_r... |
922 923 924 925 926 927 928 929 930 |
block = pClient->next_block_to_read; if (block) { block->locks--; if (block->locks == 0) { remove_from_rx_queue(pInfo, block); } } pClient->next_block_to_read = NULL; } |
1da177e4c Linux-2.6.12-rc2 |
931 932 933 934 935 936 937 |
/************************************************************* * Line discipline routines *************************************************************/ static int r3964_open(struct tty_struct *tty) { |
5e07e1ccb [PATCH] Char: n_r... |
938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 |
struct r3964_info *pInfo; TRACE_L("open"); TRACE_L("tty=%p, PID=%d, disc_data=%p", tty, current->pid, tty->disc_data); pInfo = kmalloc(sizeof(struct r3964_info), GFP_KERNEL); TRACE_M("r3964_open - info kmalloc %p", pInfo); if (!pInfo) { printk(KERN_ERR "r3964: failed to alloc info structure "); return -ENOMEM; } pInfo->rx_buf = kmalloc(RX_BUF_SIZE, GFP_KERNEL); TRACE_M("r3964_open - rx_buf kmalloc %p", pInfo->rx_buf); if (!pInfo->rx_buf) { printk(KERN_ERR "r3964: failed to alloc receive buffer "); kfree(pInfo); TRACE_M("r3964_open - info kfree %p", pInfo); return -ENOMEM; } pInfo->tx_buf = kmalloc(TX_BUF_SIZE, GFP_KERNEL); TRACE_M("r3964_open - tx_buf kmalloc %p", pInfo->tx_buf); if (!pInfo->tx_buf) { printk(KERN_ERR "r3964: failed to alloc transmit buffer "); kfree(pInfo->rx_buf); TRACE_M("r3964_open - rx_buf kfree %p", pInfo->rx_buf); kfree(pInfo); TRACE_M("r3964_open - info kfree %p", pInfo); return -ENOMEM; } spin_lock_init(&pInfo->lock); pInfo->tty = tty; init_waitqueue_head(&pInfo->read_wait); pInfo->priority = R3964_MASTER; pInfo->rx_first = pInfo->rx_last = NULL; pInfo->tx_first = pInfo->tx_last = NULL; pInfo->rx_position = 0; pInfo->tx_position = 0; pInfo->last_rx = 0; pInfo->blocks_in_rx_queue = 0; pInfo->firstClient = NULL; pInfo->state = R3964_IDLE; pInfo->flags = R3964_DEBUG; pInfo->nRetry = 0; tty->disc_data = pInfo; tty->receive_room = 65536; |
40565f196 [PATCH] Char: tim... |
994 |
setup_timer(&pInfo->tmr, on_timeout, (unsigned long)pInfo); |
5e07e1ccb [PATCH] Char: n_r... |
995 996 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
997 998 999 1000 |
} static void r3964_close(struct tty_struct *tty) { |
c9f19e96a tty: Remove some ... |
1001 |
struct r3964_info *pInfo = tty->disc_data; |
5e07e1ccb [PATCH] Char: n_r... |
1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 |
struct r3964_client_info *pClient, *pNext; struct r3964_message *pMsg; struct r3964_block_header *pHeader, *pNextHeader; unsigned long flags; TRACE_L("close"); /* * Make sure that our task queue isn't activated. If it * is, take it out of the linked list. */ del_timer_sync(&pInfo->tmr); /* Remove client-structs and message queues: */ pClient = pInfo->firstClient; while (pClient) { pNext = pClient->next; while (pClient->msg_count) { pMsg = remove_msg(pInfo, pClient); if (pMsg) { kfree(pMsg); TRACE_M("r3964_close - msg kfree %p", pMsg); } } put_pid(pClient->pid); kfree(pClient); TRACE_M("r3964_close - client kfree %p", pClient); pClient = pNext; } /* Remove jobs from tx_queue: */ spin_lock_irqsave(&pInfo->lock, flags); pHeader = pInfo->tx_first; pInfo->tx_first = pInfo->tx_last = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1035 |
spin_unlock_irqrestore(&pInfo->lock, flags); |
5e07e1ccb [PATCH] Char: n_r... |
1036 1037 1038 1039 1040 |
while (pHeader) { pNextHeader = pHeader->next; kfree(pHeader); pHeader = pNextHeader; |
1da177e4c Linux-2.6.12-rc2 |
1041 |
} |
5e07e1ccb [PATCH] Char: n_r... |
1042 1043 1044 1045 1046 1047 1048 1049 |
/* Free buffers: */ wake_up_interruptible(&pInfo->read_wait); kfree(pInfo->rx_buf); TRACE_M("r3964_close - rx_buf kfree %p", pInfo->rx_buf); kfree(pInfo->tx_buf); TRACE_M("r3964_close - tx_buf kfree %p", pInfo->tx_buf); kfree(pInfo); TRACE_M("r3964_close - info kfree %p", pInfo); |
1da177e4c Linux-2.6.12-rc2 |
1050 1051 1052 |
} static ssize_t r3964_read(struct tty_struct *tty, struct file *file, |
5e07e1ccb [PATCH] Char: n_r... |
1053 |
unsigned char __user * buf, size_t nr) |
1da177e4c Linux-2.6.12-rc2 |
1054 |
{ |
c9f19e96a tty: Remove some ... |
1055 |
struct r3964_info *pInfo = tty->disc_data; |
5e07e1ccb [PATCH] Char: n_r... |
1056 1057 1058 |
struct r3964_client_info *pClient; struct r3964_message *pMsg; struct r3964_client_message theMsg; |
eca410442 n_r3964: fix lock... |
1059 |
int ret; |
5e07e1ccb [PATCH] Char: n_r... |
1060 1061 |
TRACE_L("read()"); |
ec79d6056 tty: replace BKL ... |
1062 |
tty_lock(); |
04f378b19 tty: BKL pushdown |
1063 |
|
5e07e1ccb [PATCH] Char: n_r... |
1064 1065 1066 1067 1068 1069 |
pClient = findClient(pInfo, task_pid(current)); if (pClient) { pMsg = remove_msg(pInfo, pClient); if (pMsg == NULL) { /* no messages available. */ if (file->f_flags & O_NONBLOCK) { |
eca410442 n_r3964: fix lock... |
1070 1071 |
ret = -EAGAIN; goto unlock; |
5e07e1ccb [PATCH] Char: n_r... |
1072 1073 |
} /* block until there is a message: */ |
be1bc2889 tty: introduce wa... |
1074 |
wait_event_interruptible_tty(pInfo->read_wait, |
6defec139 Char: n_r3964, us... |
1075 |
(pMsg = remove_msg(pInfo, pClient))); |
5e07e1ccb [PATCH] Char: n_r... |
1076 1077 1078 |
} /* If we still haven't got a message, we must have been signalled */ |
04f378b19 tty: BKL pushdown |
1079 |
if (!pMsg) { |
eca410442 n_r3964: fix lock... |
1080 1081 |
ret = -EINTR; goto unlock; |
04f378b19 tty: BKL pushdown |
1082 |
} |
5e07e1ccb [PATCH] Char: n_r... |
1083 1084 1085 1086 1087 |
/* deliver msg to client process: */ theMsg.msg_id = pMsg->msg_id; theMsg.arg = pMsg->arg; theMsg.error_code = pMsg->error_code; |
eca410442 n_r3964: fix lock... |
1088 |
ret = sizeof(struct r3964_client_message); |
5e07e1ccb [PATCH] Char: n_r... |
1089 1090 1091 |
kfree(pMsg); TRACE_M("r3964_read - msg kfree %p", pMsg); |
eca410442 n_r3964: fix lock... |
1092 1093 1094 |
if (copy_to_user(buf, &theMsg, ret)) { ret = -EFAULT; goto unlock; |
04f378b19 tty: BKL pushdown |
1095 |
} |
5e07e1ccb [PATCH] Char: n_r... |
1096 |
|
eca410442 n_r3964: fix lock... |
1097 1098 |
TRACE_PS("read - return %d", ret); goto unlock; |
5e07e1ccb [PATCH] Char: n_r... |
1099 |
} |
eca410442 n_r3964: fix lock... |
1100 1101 |
ret = -EPERM; unlock: |
ec79d6056 tty: replace BKL ... |
1102 |
tty_unlock(); |
eca410442 n_r3964: fix lock... |
1103 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
1104 |
} |
5e07e1ccb [PATCH] Char: n_r... |
1105 |
static ssize_t r3964_write(struct tty_struct *tty, struct file *file, |
1da177e4c Linux-2.6.12-rc2 |
1106 1107 |
const unsigned char *data, size_t count) { |
c9f19e96a tty: Remove some ... |
1108 |
struct r3964_info *pInfo = tty->disc_data; |
5e07e1ccb [PATCH] Char: n_r... |
1109 1110 1111 1112 1113 |
struct r3964_block_header *pHeader; struct r3964_client_info *pClient; unsigned char *new_data; TRACE_L("write request, %d characters", count); |
1da177e4c Linux-2.6.12-rc2 |
1114 1115 1116 |
/* * Verify the pointers */ |
5e07e1ccb [PATCH] Char: n_r... |
1117 1118 |
if (!pInfo) return -EIO; |
1da177e4c Linux-2.6.12-rc2 |
1119 1120 1121 1122 |
/* * Ensure that the caller does not wish to send too much. */ |
5e07e1ccb [PATCH] Char: n_r... |
1123 1124 1125 1126 1127 1128 1129 |
if (count > R3964_MTU) { if (pInfo->flags & R3964_DEBUG) { TRACE_L(KERN_WARNING "r3964_write: truncating user " "packet from %u to mtu %d", count, R3964_MTU); } count = R3964_MTU; } |
1da177e4c Linux-2.6.12-rc2 |
1130 1131 1132 |
/* * Allocate a buffer for the data and copy it from the buffer with header prepended */ |
5e07e1ccb [PATCH] Char: n_r... |
1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 |
new_data = kmalloc(count + sizeof(struct r3964_block_header), GFP_KERNEL); TRACE_M("r3964_write - kmalloc %p", new_data); if (new_data == NULL) { if (pInfo->flags & R3964_DEBUG) { printk(KERN_ERR "r3964_write: no memory "); } return -ENOSPC; } pHeader = (struct r3964_block_header *)new_data; pHeader->data = new_data + sizeof(struct r3964_block_header); pHeader->length = count; pHeader->locks = 0; pHeader->owner = NULL; |
ec79d6056 tty: replace BKL ... |
1149 |
tty_lock(); |
04f378b19 tty: BKL pushdown |
1150 |
|
5e07e1ccb [PATCH] Char: n_r... |
1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 |
pClient = findClient(pInfo, task_pid(current)); if (pClient) { pHeader->owner = pClient; } memcpy(pHeader->data, data, count); /* We already verified this */ if (pInfo->flags & R3964_DEBUG) { dump_block(pHeader->data, count); } |
1da177e4c Linux-2.6.12-rc2 |
1161 1162 1163 1164 |
/* * Add buffer to transmit-queue: */ |
5e07e1ccb [PATCH] Char: n_r... |
1165 1166 |
add_tx_queue(pInfo, pHeader); trigger_transmit(pInfo); |
ec79d6056 tty: replace BKL ... |
1167 |
tty_unlock(); |
04f378b19 tty: BKL pushdown |
1168 |
|
5e07e1ccb [PATCH] Char: n_r... |
1169 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1170 |
} |
5e07e1ccb [PATCH] Char: n_r... |
1171 1172 |
static int r3964_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4c Linux-2.6.12-rc2 |
1173 |
{ |
c9f19e96a tty: Remove some ... |
1174 |
struct r3964_info *pInfo = tty->disc_data; |
5e07e1ccb [PATCH] Char: n_r... |
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 |
if (pInfo == NULL) return -EINVAL; switch (cmd) { case R3964_ENABLE_SIGNALS: return enable_signals(pInfo, task_pid(current), arg); case R3964_SETPRIORITY: if (arg < R3964_MASTER || arg > R3964_SLAVE) return -EINVAL; pInfo->priority = arg & 0xff; return 0; case R3964_USE_BCC: if (arg) pInfo->flags |= R3964_BCC; else pInfo->flags &= ~R3964_BCC; return 0; case R3964_READ_TELEGRAM: return read_telegram(pInfo, task_pid(current), (unsigned char __user *)arg); default: return -ENOIOCTLCMD; } |
1da177e4c Linux-2.6.12-rc2 |
1197 |
} |
5e07e1ccb [PATCH] Char: n_r... |
1198 |
static void r3964_set_termios(struct tty_struct *tty, struct ktermios *old) |
1da177e4c Linux-2.6.12-rc2 |
1199 |
{ |
5e07e1ccb [PATCH] Char: n_r... |
1200 |
TRACE_L("set_termios"); |
1da177e4c Linux-2.6.12-rc2 |
1201 1202 1203 |
} /* Called without the kernel lock held - fine */ |
5e07e1ccb [PATCH] Char: n_r... |
1204 1205 |
static unsigned int r3964_poll(struct tty_struct *tty, struct file *file, struct poll_table_struct *wait) |
1da177e4c Linux-2.6.12-rc2 |
1206 |
{ |
c9f19e96a tty: Remove some ... |
1207 |
struct r3964_info *pInfo = tty->disc_data; |
5e07e1ccb [PATCH] Char: n_r... |
1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 |
struct r3964_client_info *pClient; struct r3964_message *pMsg = NULL; unsigned long flags; int result = POLLOUT; TRACE_L("POLL"); pClient = findClient(pInfo, task_pid(current)); if (pClient) { poll_wait(file, &pInfo->read_wait, wait); spin_lock_irqsave(&pInfo->lock, flags); pMsg = pClient->first_msg; spin_unlock_irqrestore(&pInfo->lock, flags); if (pMsg) result |= POLLIN | POLLRDNORM; } else { result = -EINVAL; } return result; |
1da177e4c Linux-2.6.12-rc2 |
1227 |
} |
55db4c64e Revert "tty: make... |
1228 1229 |
static void r3964_receive_buf(struct tty_struct *tty, const unsigned char *cp, char *fp, int count) |
1da177e4c Linux-2.6.12-rc2 |
1230 |
{ |
c9f19e96a tty: Remove some ... |
1231 |
struct r3964_info *pInfo = tty->disc_data; |
5e07e1ccb [PATCH] Char: n_r... |
1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 |
const unsigned char *p; char *f, flags = 0; int i; for (i = count, p = cp, f = fp; i; i--, p++) { if (f) flags = *f++; if (flags == TTY_NORMAL) { receive_char(pInfo, *p); } else { receive_error(pInfo, flags); } } |
1da177e4c Linux-2.6.12-rc2 |
1246 |
} |
1da177e4c Linux-2.6.12-rc2 |
1247 1248 |
MODULE_LICENSE("GPL"); MODULE_ALIAS_LDISC(N_R3964); |