1 | /** |
---|
2 | * @file |
---|
3 | * TERMIOS serial line support |
---|
4 | */ |
---|
5 | |
---|
6 | /* |
---|
7 | * Author: |
---|
8 | * W. Eric Norum |
---|
9 | * Saskatchewan Accelerator Laboratory |
---|
10 | * University of Saskatchewan |
---|
11 | * Saskatoon, Saskatchewan, CANADA |
---|
12 | * eric@skatter.usask.ca |
---|
13 | * |
---|
14 | * The license and distribution terms for this file may be |
---|
15 | * found in the file LICENSE in this distribution or at |
---|
16 | * http://www.rtems.org/license/LICENSE. |
---|
17 | */ |
---|
18 | |
---|
19 | #if HAVE_CONFIG_H |
---|
20 | #include "config.h" |
---|
21 | #endif |
---|
22 | |
---|
23 | #include <rtems.h> |
---|
24 | #include <rtems/libio.h> |
---|
25 | #include <rtems/imfs.h> |
---|
26 | #include <rtems/score/assert.h> |
---|
27 | #include <ctype.h> |
---|
28 | #include <errno.h> |
---|
29 | #include <stdio.h> |
---|
30 | #include <stdlib.h> |
---|
31 | #include <termios.h> |
---|
32 | #include <unistd.h> |
---|
33 | #include <sys/fcntl.h> |
---|
34 | #include <sys/ttycom.h> |
---|
35 | |
---|
36 | #include <rtems/termiostypes.h> |
---|
37 | |
---|
38 | /* |
---|
39 | * The size of the cooked buffer |
---|
40 | */ |
---|
41 | #define CBUFSIZE (rtems_termios_cbufsize) |
---|
42 | |
---|
43 | /* |
---|
44 | * The sizes of the raw message buffers. |
---|
45 | * On most architectures it is quite a bit more |
---|
46 | * efficient if these are powers of two. |
---|
47 | */ |
---|
48 | #define RAW_INPUT_BUFFER_SIZE (rtems_termios_raw_input_size) |
---|
49 | #define RAW_OUTPUT_BUFFER_SIZE (rtems_termios_raw_output_size) |
---|
50 | |
---|
51 | /* fields for "flow_ctrl" status */ |
---|
52 | #define FL_IREQXOF 1U /* input queue requests stop of incoming data */ |
---|
53 | #define FL_ISNTXOF 2U /* XOFF has been sent to other side of line */ |
---|
54 | #define FL_IRTSOFF 4U /* RTS has been turned off for other side.. */ |
---|
55 | |
---|
56 | #define FL_ORCVXOF 0x10U /* XOFF has been received */ |
---|
57 | #define FL_OSTOP 0x20U /* output has been stopped due to XOFF */ |
---|
58 | |
---|
59 | #define FL_MDRTS 0x100U /* input controlled with RTS/CTS handshake */ |
---|
60 | #define FL_MDXON 0x200U /* input controlled with XON/XOFF protocol */ |
---|
61 | #define FL_MDXOF 0x400U /* output controlled with XON/XOFF protocol */ |
---|
62 | |
---|
63 | #define NODISC(n) \ |
---|
64 | { NULL, NULL, NULL, NULL, \ |
---|
65 | NULL, NULL, NULL, NULL } |
---|
66 | /* |
---|
67 | * FIXME: change rtems_termios_linesw entries consistent |
---|
68 | * with rtems_termios_linesw entry usage... |
---|
69 | */ |
---|
70 | struct rtems_termios_linesw rtems_termios_linesw[MAXLDISC] = |
---|
71 | { |
---|
72 | NODISC(0), /* 0- termios-built-in */ |
---|
73 | NODISC(1), /* 1- defunct */ |
---|
74 | NODISC(2), /* 2- NTTYDISC */ |
---|
75 | NODISC(3), /* TABLDISC */ |
---|
76 | NODISC(4), /* SLIPDISC */ |
---|
77 | NODISC(5), /* PPPDISC */ |
---|
78 | NODISC(6), /* loadable */ |
---|
79 | NODISC(7), /* loadable */ |
---|
80 | }; |
---|
81 | |
---|
82 | int rtems_termios_nlinesw = |
---|
83 | sizeof (rtems_termios_linesw) / sizeof (rtems_termios_linesw[0]); |
---|
84 | |
---|
85 | extern rtems_id rtems_termios_ttyMutex; |
---|
86 | |
---|
87 | static size_t rtems_termios_cbufsize = 256; |
---|
88 | static size_t rtems_termios_raw_input_size = 256; |
---|
89 | static size_t rtems_termios_raw_output_size = 64; |
---|
90 | |
---|
91 | static const IMFS_node_control rtems_termios_imfs_node_control; |
---|
92 | |
---|
93 | static struct rtems_termios_tty *rtems_termios_ttyHead; |
---|
94 | static struct rtems_termios_tty *rtems_termios_ttyTail; |
---|
95 | |
---|
96 | static RTEMS_CHAIN_DEFINE_EMPTY(rtems_termios_devices); |
---|
97 | |
---|
98 | static rtems_task rtems_termios_rxdaemon(rtems_task_argument argument); |
---|
99 | static rtems_task rtems_termios_txdaemon(rtems_task_argument argument); |
---|
100 | /* |
---|
101 | * some constants for I/O daemon task creation |
---|
102 | */ |
---|
103 | #define TERMIOS_TXTASK_PRIO 10 |
---|
104 | #define TERMIOS_RXTASK_PRIO 9 |
---|
105 | #define TERMIOS_TXTASK_STACKSIZE 1024 |
---|
106 | #define TERMIOS_RXTASK_STACKSIZE 1024 |
---|
107 | /* |
---|
108 | * some events to be sent to the I/O tasks |
---|
109 | */ |
---|
110 | #define TERMIOS_TX_START_EVENT RTEMS_EVENT_1 |
---|
111 | #define TERMIOS_TX_TERMINATE_EVENT RTEMS_EVENT_0 |
---|
112 | |
---|
113 | #define TERMIOS_RX_PROC_EVENT RTEMS_EVENT_1 |
---|
114 | #define TERMIOS_RX_TERMINATE_EVENT RTEMS_EVENT_0 |
---|
115 | |
---|
116 | static rtems_status_code |
---|
117 | rtems_termios_obtain (void) |
---|
118 | { |
---|
119 | return rtems_semaphore_obtain (rtems_termios_ttyMutex, RTEMS_WAIT, |
---|
120 | RTEMS_NO_TIMEOUT); |
---|
121 | } |
---|
122 | |
---|
123 | static void |
---|
124 | rtems_termios_release (void) |
---|
125 | { |
---|
126 | rtems_status_code sc; |
---|
127 | |
---|
128 | sc = rtems_semaphore_release (rtems_termios_ttyMutex); |
---|
129 | _Assert (sc == RTEMS_SUCCESSFUL); |
---|
130 | (void) sc; |
---|
131 | } |
---|
132 | |
---|
133 | rtems_status_code rtems_termios_device_install( |
---|
134 | const char *device_file, |
---|
135 | const rtems_termios_device_handler *handler, |
---|
136 | const rtems_termios_device_flow *flow, |
---|
137 | rtems_termios_device_context *context |
---|
138 | ) |
---|
139 | { |
---|
140 | rtems_termios_device_node *new_device_node; |
---|
141 | int rv; |
---|
142 | |
---|
143 | new_device_node = calloc (1, sizeof(*new_device_node)); |
---|
144 | if (new_device_node == NULL) { |
---|
145 | return RTEMS_NO_MEMORY; |
---|
146 | } |
---|
147 | |
---|
148 | rtems_chain_initialize_node (&new_device_node->node); |
---|
149 | new_device_node->handler = handler; |
---|
150 | new_device_node->flow = flow; |
---|
151 | new_device_node->context = context; |
---|
152 | new_device_node->tty = NULL; |
---|
153 | |
---|
154 | rv = IMFS_make_generic_node( |
---|
155 | device_file, |
---|
156 | S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, |
---|
157 | &rtems_termios_imfs_node_control, |
---|
158 | new_device_node |
---|
159 | ); |
---|
160 | if (rv != 0) { |
---|
161 | free (new_device_node); |
---|
162 | return RTEMS_UNSATISFIED; |
---|
163 | } |
---|
164 | |
---|
165 | return RTEMS_SUCCESSFUL; |
---|
166 | } |
---|
167 | |
---|
168 | static rtems_termios_tty * |
---|
169 | legacyContextToTTY (rtems_termios_device_context *ctx) |
---|
170 | { |
---|
171 | return RTEMS_CONTAINER_OF (ctx, rtems_termios_tty, legacy_device_context); |
---|
172 | } |
---|
173 | |
---|
174 | static bool |
---|
175 | rtems_termios_callback_firstOpen( |
---|
176 | rtems_termios_tty *tty, |
---|
177 | rtems_termios_device_context *ctx, |
---|
178 | struct termios *term, |
---|
179 | rtems_libio_open_close_args_t *args |
---|
180 | ) |
---|
181 | { |
---|
182 | (void) ctx; |
---|
183 | (void) term; |
---|
184 | |
---|
185 | (*tty->device.firstOpen) (tty->major, tty->minor, args); |
---|
186 | |
---|
187 | return true; |
---|
188 | } |
---|
189 | |
---|
190 | static void |
---|
191 | rtems_termios_callback_lastClose( |
---|
192 | rtems_termios_tty *tty, |
---|
193 | rtems_termios_device_context *ctx, |
---|
194 | rtems_libio_open_close_args_t *args |
---|
195 | ) |
---|
196 | { |
---|
197 | (void) ctx; |
---|
198 | |
---|
199 | (*tty->device.lastClose) (tty->major, tty->minor, args); |
---|
200 | } |
---|
201 | |
---|
202 | static int |
---|
203 | rtems_termios_callback_pollRead (rtems_termios_device_context *ctx) |
---|
204 | { |
---|
205 | rtems_termios_tty *tty = legacyContextToTTY (ctx); |
---|
206 | |
---|
207 | return (*tty->device.pollRead) (tty->minor); |
---|
208 | } |
---|
209 | |
---|
210 | static void |
---|
211 | rtems_termios_callback_write( |
---|
212 | rtems_termios_device_context *ctx, |
---|
213 | const char *buf, |
---|
214 | size_t len |
---|
215 | ) |
---|
216 | { |
---|
217 | rtems_termios_tty *tty = legacyContextToTTY (ctx); |
---|
218 | |
---|
219 | (*tty->device.write) (tty->minor, buf, len); |
---|
220 | } |
---|
221 | |
---|
222 | static bool |
---|
223 | rtems_termios_callback_setAttributes( |
---|
224 | rtems_termios_device_context *ctx, |
---|
225 | const struct termios *term |
---|
226 | ) |
---|
227 | { |
---|
228 | rtems_termios_tty *tty = legacyContextToTTY (ctx); |
---|
229 | |
---|
230 | (*tty->device.setAttributes) (tty->minor, term); |
---|
231 | |
---|
232 | return true; |
---|
233 | } |
---|
234 | |
---|
235 | static void |
---|
236 | rtems_termios_callback_stopRemoteTx (rtems_termios_device_context *ctx) |
---|
237 | { |
---|
238 | rtems_termios_tty *tty = legacyContextToTTY (ctx); |
---|
239 | |
---|
240 | (*tty->device.stopRemoteTx) (tty->minor); |
---|
241 | } |
---|
242 | |
---|
243 | static void |
---|
244 | rtems_termios_callback_startRemoteTx (rtems_termios_device_context *ctx) |
---|
245 | { |
---|
246 | rtems_termios_tty *tty = legacyContextToTTY (ctx); |
---|
247 | |
---|
248 | (*tty->device.startRemoteTx) (tty->minor); |
---|
249 | } |
---|
250 | |
---|
251 | /* |
---|
252 | * Drain output queue |
---|
253 | */ |
---|
254 | static void |
---|
255 | drainOutput (struct rtems_termios_tty *tty) |
---|
256 | { |
---|
257 | rtems_termios_device_context *ctx = tty->device_context; |
---|
258 | rtems_interrupt_lock_context lock_context; |
---|
259 | rtems_status_code sc; |
---|
260 | |
---|
261 | if (tty->handler.mode != TERMIOS_POLLED) { |
---|
262 | rtems_termios_device_lock_acquire (ctx, &lock_context); |
---|
263 | while (tty->rawOutBuf.Tail != tty->rawOutBuf.Head) { |
---|
264 | tty->rawOutBufState = rob_wait; |
---|
265 | rtems_termios_device_lock_release (ctx, &lock_context); |
---|
266 | sc = rtems_semaphore_obtain( |
---|
267 | tty->rawOutBuf.Semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
268 | if (sc != RTEMS_SUCCESSFUL) |
---|
269 | rtems_fatal_error_occurred (sc); |
---|
270 | rtems_termios_device_lock_acquire (ctx, &lock_context); |
---|
271 | } |
---|
272 | rtems_termios_device_lock_release (ctx, &lock_context); |
---|
273 | } |
---|
274 | } |
---|
275 | |
---|
276 | static bool |
---|
277 | needDeviceMutex (rtems_termios_tty *tty) |
---|
278 | { |
---|
279 | return tty->handler.mode == TERMIOS_IRQ_SERVER_DRIVEN |
---|
280 | || tty->handler.mode == TERMIOS_TASK_DRIVEN; |
---|
281 | } |
---|
282 | |
---|
283 | static void |
---|
284 | rtems_termios_destroy_tty (rtems_termios_tty *tty, void *arg, bool last_close) |
---|
285 | { |
---|
286 | rtems_status_code sc; |
---|
287 | |
---|
288 | if (rtems_termios_linesw[tty->t_line].l_close != NULL) { |
---|
289 | /* |
---|
290 | * call discipline-specific close |
---|
291 | */ |
---|
292 | (void) rtems_termios_linesw[tty->t_line].l_close(tty); |
---|
293 | } else if (last_close) { |
---|
294 | /* |
---|
295 | * default: just flush output buffer |
---|
296 | */ |
---|
297 | sc = rtems_semaphore_obtain(tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
298 | if (sc != RTEMS_SUCCESSFUL) { |
---|
299 | rtems_fatal_error_occurred (sc); |
---|
300 | } |
---|
301 | drainOutput (tty); |
---|
302 | rtems_semaphore_release (tty->osem); |
---|
303 | } |
---|
304 | |
---|
305 | if (tty->handler.mode == TERMIOS_TASK_DRIVEN) { |
---|
306 | /* |
---|
307 | * send "terminate" to I/O tasks |
---|
308 | */ |
---|
309 | sc = rtems_event_send( tty->rxTaskId, TERMIOS_RX_TERMINATE_EVENT ); |
---|
310 | if (sc != RTEMS_SUCCESSFUL) |
---|
311 | rtems_fatal_error_occurred (sc); |
---|
312 | sc = rtems_event_send( tty->txTaskId, TERMIOS_TX_TERMINATE_EVENT ); |
---|
313 | if (sc != RTEMS_SUCCESSFUL) |
---|
314 | rtems_fatal_error_occurred (sc); |
---|
315 | } |
---|
316 | if (last_close && tty->handler.last_close) |
---|
317 | (*tty->handler.last_close)(tty, tty->device_context, arg); |
---|
318 | |
---|
319 | if (tty->device_node != NULL) |
---|
320 | tty->device_node->tty = NULL; |
---|
321 | |
---|
322 | rtems_semaphore_delete (tty->isem); |
---|
323 | rtems_semaphore_delete (tty->osem); |
---|
324 | rtems_semaphore_delete (tty->rawOutBuf.Semaphore); |
---|
325 | if ((tty->handler.poll_read == NULL) || |
---|
326 | (tty->handler.mode == TERMIOS_TASK_DRIVEN)) |
---|
327 | rtems_semaphore_delete (tty->rawInBuf.Semaphore); |
---|
328 | |
---|
329 | if (needDeviceMutex (tty)) { |
---|
330 | rtems_semaphore_delete (tty->device_context->lock.mutex); |
---|
331 | } else if (tty->device_context == &tty->legacy_device_context) { |
---|
332 | rtems_interrupt_lock_destroy (&tty->legacy_device_context.lock.interrupt); |
---|
333 | } |
---|
334 | |
---|
335 | free (tty->rawInBuf.theBuf); |
---|
336 | free (tty->rawOutBuf.theBuf); |
---|
337 | free (tty->cbuf); |
---|
338 | free (tty); |
---|
339 | } |
---|
340 | |
---|
341 | static void |
---|
342 | deviceAcquireMutex( |
---|
343 | rtems_termios_device_context *ctx, |
---|
344 | rtems_interrupt_lock_context *lock_context |
---|
345 | ) |
---|
346 | { |
---|
347 | rtems_status_code sc; |
---|
348 | |
---|
349 | sc = rtems_semaphore_obtain (ctx->lock.mutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
350 | _Assert (sc == RTEMS_SUCCESSFUL); |
---|
351 | (void) sc; |
---|
352 | } |
---|
353 | |
---|
354 | static void |
---|
355 | deviceReleaseMutex( |
---|
356 | rtems_termios_device_context *ctx, |
---|
357 | rtems_interrupt_lock_context *lock_context |
---|
358 | ) |
---|
359 | { |
---|
360 | rtems_status_code sc; |
---|
361 | |
---|
362 | sc = rtems_semaphore_release (ctx->lock.mutex); |
---|
363 | _Assert (sc == RTEMS_SUCCESSFUL); |
---|
364 | (void) sc; |
---|
365 | } |
---|
366 | |
---|
367 | void |
---|
368 | rtems_termios_device_lock_acquire_default( |
---|
369 | rtems_termios_device_context *ctx, |
---|
370 | rtems_interrupt_lock_context *lock_context |
---|
371 | ) |
---|
372 | { |
---|
373 | rtems_interrupt_lock_acquire (&ctx->lock.interrupt, lock_context); |
---|
374 | } |
---|
375 | |
---|
376 | void |
---|
377 | rtems_termios_device_lock_release_default( |
---|
378 | rtems_termios_device_context *ctx, |
---|
379 | rtems_interrupt_lock_context *lock_context |
---|
380 | ) |
---|
381 | { |
---|
382 | rtems_interrupt_lock_release (&ctx->lock.interrupt, lock_context); |
---|
383 | } |
---|
384 | |
---|
385 | static rtems_termios_tty * |
---|
386 | rtems_termios_open_tty( |
---|
387 | rtems_device_major_number major, |
---|
388 | rtems_device_minor_number minor, |
---|
389 | rtems_libio_open_close_args_t *args, |
---|
390 | rtems_termios_tty *tty, |
---|
391 | rtems_termios_device_node *device_node, |
---|
392 | const rtems_termios_callbacks *callbacks |
---|
393 | ) |
---|
394 | { |
---|
395 | rtems_status_code sc; |
---|
396 | |
---|
397 | if (tty == NULL) { |
---|
398 | static char c = 'a'; |
---|
399 | rtems_termios_device_context *ctx; |
---|
400 | |
---|
401 | /* |
---|
402 | * Create a new device |
---|
403 | */ |
---|
404 | tty = calloc (1, sizeof (struct rtems_termios_tty)); |
---|
405 | if (tty == NULL) { |
---|
406 | return NULL; |
---|
407 | } |
---|
408 | /* |
---|
409 | * allocate raw input buffer |
---|
410 | */ |
---|
411 | tty->rawInBuf.Size = RAW_INPUT_BUFFER_SIZE; |
---|
412 | tty->rawInBuf.theBuf = malloc (tty->rawInBuf.Size); |
---|
413 | if (tty->rawInBuf.theBuf == NULL) { |
---|
414 | free(tty); |
---|
415 | return NULL; |
---|
416 | } |
---|
417 | /* |
---|
418 | * allocate raw output buffer |
---|
419 | */ |
---|
420 | tty->rawOutBuf.Size = RAW_OUTPUT_BUFFER_SIZE; |
---|
421 | tty->rawOutBuf.theBuf = malloc (tty->rawOutBuf.Size); |
---|
422 | if (tty->rawOutBuf.theBuf == NULL) { |
---|
423 | free((void *)(tty->rawInBuf.theBuf)); |
---|
424 | free(tty); |
---|
425 | return NULL; |
---|
426 | } |
---|
427 | /* |
---|
428 | * allocate cooked buffer |
---|
429 | */ |
---|
430 | tty->cbuf = malloc (CBUFSIZE); |
---|
431 | if (tty->cbuf == NULL) { |
---|
432 | free((void *)(tty->rawOutBuf.theBuf)); |
---|
433 | free((void *)(tty->rawInBuf.theBuf)); |
---|
434 | free(tty); |
---|
435 | return NULL; |
---|
436 | } |
---|
437 | /* |
---|
438 | * Initialize wakeup callbacks |
---|
439 | */ |
---|
440 | tty->tty_snd.sw_pfn = NULL; |
---|
441 | tty->tty_snd.sw_arg = NULL; |
---|
442 | tty->tty_rcv.sw_pfn = NULL; |
---|
443 | tty->tty_rcv.sw_arg = NULL; |
---|
444 | tty->tty_rcvwakeup = false; |
---|
445 | |
---|
446 | tty->minor = minor; |
---|
447 | tty->major = major; |
---|
448 | |
---|
449 | /* |
---|
450 | * Set up mutex semaphores |
---|
451 | */ |
---|
452 | sc = rtems_semaphore_create ( |
---|
453 | rtems_build_name ('T', 'R', 'i', c), |
---|
454 | 1, |
---|
455 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
---|
456 | RTEMS_NO_PRIORITY, |
---|
457 | &tty->isem); |
---|
458 | if (sc != RTEMS_SUCCESSFUL) |
---|
459 | rtems_fatal_error_occurred (sc); |
---|
460 | sc = rtems_semaphore_create ( |
---|
461 | rtems_build_name ('T', 'R', 'o', c), |
---|
462 | 1, |
---|
463 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
---|
464 | RTEMS_NO_PRIORITY, |
---|
465 | &tty->osem); |
---|
466 | if (sc != RTEMS_SUCCESSFUL) |
---|
467 | rtems_fatal_error_occurred (sc); |
---|
468 | sc = rtems_semaphore_create ( |
---|
469 | rtems_build_name ('T', 'R', 'x', c), |
---|
470 | 0, |
---|
471 | RTEMS_SIMPLE_BINARY_SEMAPHORE | RTEMS_FIFO, |
---|
472 | RTEMS_NO_PRIORITY, |
---|
473 | &tty->rawOutBuf.Semaphore); |
---|
474 | if (sc != RTEMS_SUCCESSFUL) |
---|
475 | rtems_fatal_error_occurred (sc); |
---|
476 | tty->rawOutBufState = rob_idle; |
---|
477 | |
---|
478 | /* |
---|
479 | * Set callbacks |
---|
480 | */ |
---|
481 | if (device_node != NULL) { |
---|
482 | device_node->tty = tty; |
---|
483 | tty->handler = *device_node->handler; |
---|
484 | |
---|
485 | if (device_node->flow != NULL) { |
---|
486 | tty->flow = *device_node->flow; |
---|
487 | } |
---|
488 | |
---|
489 | tty->device_node = device_node; |
---|
490 | tty->device_context = device_node->context; |
---|
491 | memset(&tty->device, 0, sizeof(tty->device)); |
---|
492 | } else { |
---|
493 | tty->handler.first_open = callbacks->firstOpen != NULL ? |
---|
494 | rtems_termios_callback_firstOpen : NULL; |
---|
495 | tty->handler.last_close = callbacks->lastClose != NULL ? |
---|
496 | rtems_termios_callback_lastClose : NULL; |
---|
497 | tty->handler.poll_read = callbacks->pollRead != NULL ? |
---|
498 | rtems_termios_callback_pollRead : NULL; |
---|
499 | tty->handler.write = callbacks->write != NULL ? |
---|
500 | rtems_termios_callback_write : NULL; |
---|
501 | tty->handler.set_attributes = callbacks->setAttributes != NULL ? |
---|
502 | rtems_termios_callback_setAttributes : NULL; |
---|
503 | tty->flow.stop_remote_tx = callbacks->stopRemoteTx != NULL ? |
---|
504 | rtems_termios_callback_stopRemoteTx : NULL; |
---|
505 | tty->flow.start_remote_tx = callbacks->startRemoteTx != NULL ? |
---|
506 | rtems_termios_callback_startRemoteTx : NULL; |
---|
507 | tty->handler.mode = callbacks->outputUsesInterrupts; |
---|
508 | tty->device_context = NULL; |
---|
509 | tty->device_node = NULL; |
---|
510 | tty->device = *callbacks; |
---|
511 | } |
---|
512 | |
---|
513 | if (tty->device_context == NULL) { |
---|
514 | tty->device_context = &tty->legacy_device_context; |
---|
515 | rtems_termios_device_context_initialize (tty->device_context, "Termios"); |
---|
516 | } |
---|
517 | |
---|
518 | ctx = tty->device_context; |
---|
519 | |
---|
520 | if (needDeviceMutex (tty)) { |
---|
521 | sc = rtems_semaphore_create ( |
---|
522 | rtems_build_name ('T', 'l', 'k', c), |
---|
523 | 1, |
---|
524 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
---|
525 | 0, |
---|
526 | &ctx->lock.mutex); |
---|
527 | if (sc != RTEMS_SUCCESSFUL) { |
---|
528 | rtems_fatal_error_occurred (sc); |
---|
529 | } |
---|
530 | |
---|
531 | ctx->lock_acquire = deviceAcquireMutex; |
---|
532 | ctx->lock_release = deviceReleaseMutex; |
---|
533 | } else { |
---|
534 | ctx->lock_acquire = rtems_termios_device_lock_acquire_default; |
---|
535 | ctx->lock_release = rtems_termios_device_lock_release_default; |
---|
536 | } |
---|
537 | |
---|
538 | /* |
---|
539 | * Create I/O tasks |
---|
540 | */ |
---|
541 | if (tty->handler.mode == TERMIOS_TASK_DRIVEN) { |
---|
542 | sc = rtems_task_create ( |
---|
543 | rtems_build_name ('T', 'x', 'T', c), |
---|
544 | TERMIOS_TXTASK_PRIO, |
---|
545 | TERMIOS_TXTASK_STACKSIZE, |
---|
546 | RTEMS_NO_PREEMPT | RTEMS_NO_TIMESLICE | |
---|
547 | RTEMS_NO_ASR, |
---|
548 | RTEMS_NO_FLOATING_POINT | RTEMS_LOCAL, |
---|
549 | &tty->txTaskId); |
---|
550 | if (sc != RTEMS_SUCCESSFUL) |
---|
551 | rtems_fatal_error_occurred (sc); |
---|
552 | sc = rtems_task_create ( |
---|
553 | rtems_build_name ('R', 'x', 'T', c), |
---|
554 | TERMIOS_RXTASK_PRIO, |
---|
555 | TERMIOS_RXTASK_STACKSIZE, |
---|
556 | RTEMS_NO_PREEMPT | RTEMS_NO_TIMESLICE | |
---|
557 | RTEMS_NO_ASR, |
---|
558 | RTEMS_NO_FLOATING_POINT | RTEMS_LOCAL, |
---|
559 | &tty->rxTaskId); |
---|
560 | if (sc != RTEMS_SUCCESSFUL) |
---|
561 | rtems_fatal_error_occurred (sc); |
---|
562 | |
---|
563 | } |
---|
564 | if ((tty->handler.poll_read == NULL) || |
---|
565 | (tty->handler.mode == TERMIOS_TASK_DRIVEN)){ |
---|
566 | sc = rtems_semaphore_create ( |
---|
567 | rtems_build_name ('T', 'R', 'r', c), |
---|
568 | 0, |
---|
569 | RTEMS_SIMPLE_BINARY_SEMAPHORE | RTEMS_PRIORITY, |
---|
570 | RTEMS_NO_PRIORITY, |
---|
571 | &tty->rawInBuf.Semaphore); |
---|
572 | if (sc != RTEMS_SUCCESSFUL) |
---|
573 | rtems_fatal_error_occurred (sc); |
---|
574 | } |
---|
575 | |
---|
576 | /* |
---|
577 | * Set default parameters |
---|
578 | */ |
---|
579 | tty->termios.c_iflag = BRKINT | ICRNL | IXON | IMAXBEL; |
---|
580 | tty->termios.c_oflag = OPOST | ONLCR | XTABS; |
---|
581 | tty->termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL; |
---|
582 | tty->termios.c_lflag = |
---|
583 | ISIG | ICANON | IEXTEN | ECHO | ECHOK | ECHOE | ECHOCTL; |
---|
584 | |
---|
585 | tty->termios.c_cc[VINTR] = '\003'; |
---|
586 | tty->termios.c_cc[VQUIT] = '\034'; |
---|
587 | tty->termios.c_cc[VERASE] = '\177'; |
---|
588 | tty->termios.c_cc[VKILL] = '\025'; |
---|
589 | tty->termios.c_cc[VEOF] = '\004'; |
---|
590 | tty->termios.c_cc[VEOL] = '\000'; |
---|
591 | tty->termios.c_cc[VEOL2] = '\000'; |
---|
592 | tty->termios.c_cc[VSTART] = '\021'; |
---|
593 | tty->termios.c_cc[VSTOP] = '\023'; |
---|
594 | tty->termios.c_cc[VSUSP] = '\032'; |
---|
595 | tty->termios.c_cc[VREPRINT] = '\022'; |
---|
596 | tty->termios.c_cc[VDISCARD] = '\017'; |
---|
597 | tty->termios.c_cc[VWERASE] = '\027'; |
---|
598 | tty->termios.c_cc[VLNEXT] = '\026'; |
---|
599 | |
---|
600 | /* start with no flow control, clear flow control flags */ |
---|
601 | tty->flow_ctrl = 0; |
---|
602 | /* |
---|
603 | * set low/highwater mark for XON/XOFF support |
---|
604 | */ |
---|
605 | tty->lowwater = tty->rawInBuf.Size * 1/2; |
---|
606 | tty->highwater = tty->rawInBuf.Size * 3/4; |
---|
607 | /* |
---|
608 | * Bump name characer |
---|
609 | */ |
---|
610 | if (c++ == 'z') |
---|
611 | c = 'a'; |
---|
612 | |
---|
613 | } |
---|
614 | args->iop->data1 = tty; |
---|
615 | if (!tty->refcount++) { |
---|
616 | if (tty->handler.first_open && !(*tty->handler.first_open)( |
---|
617 | tty, tty->device_context, &tty->termios, args)) { |
---|
618 | rtems_termios_destroy_tty(tty, args, false); |
---|
619 | return NULL; |
---|
620 | } |
---|
621 | |
---|
622 | /* |
---|
623 | * start I/O tasks, if needed |
---|
624 | */ |
---|
625 | if (tty->handler.mode == TERMIOS_TASK_DRIVEN) { |
---|
626 | sc = rtems_task_start( |
---|
627 | tty->rxTaskId, rtems_termios_rxdaemon, (rtems_task_argument)tty); |
---|
628 | if (sc != RTEMS_SUCCESSFUL) |
---|
629 | rtems_fatal_error_occurred (sc); |
---|
630 | |
---|
631 | sc = rtems_task_start( |
---|
632 | tty->txTaskId, rtems_termios_txdaemon, (rtems_task_argument)tty); |
---|
633 | if (sc != RTEMS_SUCCESSFUL) |
---|
634 | rtems_fatal_error_occurred (sc); |
---|
635 | } |
---|
636 | } |
---|
637 | |
---|
638 | return tty; |
---|
639 | } |
---|
640 | |
---|
641 | /* |
---|
642 | * Open a termios device |
---|
643 | */ |
---|
644 | rtems_status_code |
---|
645 | rtems_termios_open ( |
---|
646 | rtems_device_major_number major, |
---|
647 | rtems_device_minor_number minor, |
---|
648 | void *arg, |
---|
649 | const rtems_termios_callbacks *callbacks |
---|
650 | ) |
---|
651 | { |
---|
652 | rtems_status_code sc; |
---|
653 | struct rtems_termios_tty *tty; |
---|
654 | |
---|
655 | /* |
---|
656 | * See if the device has already been opened |
---|
657 | */ |
---|
658 | sc = rtems_termios_obtain (); |
---|
659 | if (sc != RTEMS_SUCCESSFUL) |
---|
660 | return sc; |
---|
661 | |
---|
662 | for (tty = rtems_termios_ttyHead ; tty != NULL ; tty = tty->forw) { |
---|
663 | if ((tty->major == major) && (tty->minor == minor)) |
---|
664 | break; |
---|
665 | } |
---|
666 | |
---|
667 | tty = rtems_termios_open_tty( |
---|
668 | major, minor, arg, tty, NULL, callbacks); |
---|
669 | if (tty == NULL) { |
---|
670 | rtems_termios_release (); |
---|
671 | return RTEMS_NO_MEMORY; |
---|
672 | } |
---|
673 | |
---|
674 | if (tty->refcount == 1) { |
---|
675 | /* |
---|
676 | * link tty |
---|
677 | */ |
---|
678 | tty->forw = rtems_termios_ttyHead; |
---|
679 | tty->back = NULL; |
---|
680 | if (rtems_termios_ttyHead != NULL) |
---|
681 | rtems_termios_ttyHead->back = tty; |
---|
682 | rtems_termios_ttyHead = tty; |
---|
683 | if (rtems_termios_ttyTail == NULL) |
---|
684 | rtems_termios_ttyTail = tty; |
---|
685 | } |
---|
686 | |
---|
687 | rtems_termios_release (); |
---|
688 | |
---|
689 | return RTEMS_SUCCESSFUL; |
---|
690 | } |
---|
691 | |
---|
692 | static void |
---|
693 | flushOutput (struct rtems_termios_tty *tty) |
---|
694 | { |
---|
695 | rtems_termios_device_context *ctx = tty->device_context; |
---|
696 | rtems_interrupt_lock_context lock_context; |
---|
697 | |
---|
698 | rtems_termios_device_lock_acquire (ctx, &lock_context); |
---|
699 | tty->rawOutBuf.Tail = 0; |
---|
700 | tty->rawOutBuf.Head = 0; |
---|
701 | tty->rawOutBufState = rob_idle; |
---|
702 | rtems_termios_device_lock_release (ctx, &lock_context); |
---|
703 | } |
---|
704 | |
---|
705 | static void |
---|
706 | flushInput (struct rtems_termios_tty *tty) |
---|
707 | { |
---|
708 | rtems_termios_device_context *ctx = tty->device_context; |
---|
709 | rtems_interrupt_lock_context lock_context; |
---|
710 | |
---|
711 | rtems_termios_device_lock_acquire (ctx, &lock_context); |
---|
712 | tty->rawInBuf.Tail = 0; |
---|
713 | tty->rawInBuf.Head = 0; |
---|
714 | rtems_termios_device_lock_release (ctx, &lock_context); |
---|
715 | } |
---|
716 | |
---|
717 | static void |
---|
718 | rtems_termios_close_tty (rtems_termios_tty *tty, void *arg) |
---|
719 | { |
---|
720 | if (--tty->refcount == 0) { |
---|
721 | rtems_termios_destroy_tty (tty, arg, true); |
---|
722 | } |
---|
723 | } |
---|
724 | |
---|
725 | rtems_status_code |
---|
726 | rtems_termios_close (void *arg) |
---|
727 | { |
---|
728 | rtems_status_code sc; |
---|
729 | rtems_libio_open_close_args_t *args = arg; |
---|
730 | struct rtems_termios_tty *tty = args->iop->data1; |
---|
731 | |
---|
732 | sc = rtems_termios_obtain (); |
---|
733 | if (sc != RTEMS_SUCCESSFUL) |
---|
734 | rtems_fatal_error_occurred (sc); |
---|
735 | |
---|
736 | if (tty->refcount == 1) { |
---|
737 | if (tty->forw == NULL) { |
---|
738 | rtems_termios_ttyTail = tty->back; |
---|
739 | if ( rtems_termios_ttyTail != NULL ) { |
---|
740 | rtems_termios_ttyTail->forw = NULL; |
---|
741 | } |
---|
742 | } else { |
---|
743 | tty->forw->back = tty->back; |
---|
744 | } |
---|
745 | |
---|
746 | if (tty->back == NULL) { |
---|
747 | rtems_termios_ttyHead = tty->forw; |
---|
748 | if ( rtems_termios_ttyHead != NULL ) { |
---|
749 | rtems_termios_ttyHead->back = NULL; |
---|
750 | } |
---|
751 | } else { |
---|
752 | tty->back->forw = tty->forw; |
---|
753 | } |
---|
754 | } |
---|
755 | |
---|
756 | rtems_termios_close_tty (tty, arg); |
---|
757 | |
---|
758 | rtems_termios_release (); |
---|
759 | |
---|
760 | return RTEMS_SUCCESSFUL; |
---|
761 | } |
---|
762 | |
---|
763 | rtems_status_code rtems_termios_bufsize ( |
---|
764 | size_t cbufsize, |
---|
765 | size_t raw_input, |
---|
766 | size_t raw_output |
---|
767 | ) |
---|
768 | { |
---|
769 | rtems_termios_cbufsize = cbufsize; |
---|
770 | rtems_termios_raw_input_size = raw_input; |
---|
771 | rtems_termios_raw_output_size = raw_output; |
---|
772 | return RTEMS_SUCCESSFUL; |
---|
773 | } |
---|
774 | |
---|
775 | static void |
---|
776 | termios_set_flowctrl(struct rtems_termios_tty *tty) |
---|
777 | { |
---|
778 | rtems_termios_device_context *ctx = tty->device_context; |
---|
779 | rtems_interrupt_lock_context lock_context; |
---|
780 | /* |
---|
781 | * check for flow control options to be switched off |
---|
782 | */ |
---|
783 | |
---|
784 | /* check for outgoing XON/XOFF flow control switched off */ |
---|
785 | if (( tty->flow_ctrl & FL_MDXON) && |
---|
786 | !(tty->termios.c_iflag & IXON)) { |
---|
787 | /* clear related flags in flow_ctrl */ |
---|
788 | tty->flow_ctrl &= ~(FL_MDXON | FL_ORCVXOF); |
---|
789 | |
---|
790 | /* has output been stopped due to received XOFF? */ |
---|
791 | if (tty->flow_ctrl & FL_OSTOP) { |
---|
792 | /* disable interrupts */ |
---|
793 | rtems_termios_device_lock_acquire (ctx, &lock_context); |
---|
794 | tty->flow_ctrl &= ~FL_OSTOP; |
---|
795 | /* check for chars in output buffer (or rob_state?) */ |
---|
796 | if (tty->rawOutBufState != rob_idle) { |
---|
797 | /* if chars available, call write function... */ |
---|
798 | (*tty->handler.write)( |
---|
799 | ctx, &tty->rawOutBuf.theBuf[tty->rawOutBuf.Tail],1); |
---|
800 | } |
---|
801 | /* reenable interrupts */ |
---|
802 | rtems_termios_device_lock_release (ctx, &lock_context); |
---|
803 | } |
---|
804 | } |
---|
805 | /* check for incoming XON/XOFF flow control switched off */ |
---|
806 | if (( tty->flow_ctrl & FL_MDXOF) && !(tty->termios.c_iflag & IXOFF)) { |
---|
807 | /* clear related flags in flow_ctrl */ |
---|
808 | tty->flow_ctrl &= ~(FL_MDXOF); |
---|
809 | /* FIXME: what happens, if we had sent XOFF but not yet XON? */ |
---|
810 | tty->flow_ctrl &= ~(FL_ISNTXOF); |
---|
811 | } |
---|
812 | |
---|
813 | /* check for incoming RTS/CTS flow control switched off */ |
---|
814 | if (( tty->flow_ctrl & FL_MDRTS) && !(tty->termios.c_cflag & CRTSCTS)) { |
---|
815 | /* clear related flags in flow_ctrl */ |
---|
816 | tty->flow_ctrl &= ~(FL_MDRTS); |
---|
817 | |
---|
818 | /* restart remote Tx, if it was stopped */ |
---|
819 | if ((tty->flow_ctrl & FL_IRTSOFF) && |
---|
820 | (tty->flow.start_remote_tx != NULL)) { |
---|
821 | tty->flow.start_remote_tx(ctx); |
---|
822 | } |
---|
823 | tty->flow_ctrl &= ~(FL_IRTSOFF); |
---|
824 | } |
---|
825 | |
---|
826 | /* |
---|
827 | * check for flow control options to be switched on |
---|
828 | */ |
---|
829 | /* check for incoming RTS/CTS flow control switched on */ |
---|
830 | if (tty->termios.c_cflag & CRTSCTS) { |
---|
831 | tty->flow_ctrl |= FL_MDRTS; |
---|
832 | } |
---|
833 | /* check for incoming XON/XOF flow control switched on */ |
---|
834 | if (tty->termios.c_iflag & IXOFF) { |
---|
835 | tty->flow_ctrl |= FL_MDXOF; |
---|
836 | } |
---|
837 | /* check for outgoing XON/XOF flow control switched on */ |
---|
838 | if (tty->termios.c_iflag & IXON) { |
---|
839 | tty->flow_ctrl |= FL_MDXON; |
---|
840 | } |
---|
841 | } |
---|
842 | |
---|
843 | rtems_status_code |
---|
844 | rtems_termios_ioctl (void *arg) |
---|
845 | { |
---|
846 | rtems_libio_ioctl_args_t *args = arg; |
---|
847 | struct rtems_termios_tty *tty = args->iop->data1; |
---|
848 | struct ttywakeup *wakeup = (struct ttywakeup *)args->buffer; |
---|
849 | rtems_status_code sc; |
---|
850 | int flags = *((int *)args->buffer); |
---|
851 | |
---|
852 | args->ioctl_return = 0; |
---|
853 | sc = rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
854 | if (sc != RTEMS_SUCCESSFUL) { |
---|
855 | return sc; |
---|
856 | } |
---|
857 | switch (args->command) { |
---|
858 | default: |
---|
859 | if (rtems_termios_linesw[tty->t_line].l_ioctl != NULL) { |
---|
860 | sc = rtems_termios_linesw[tty->t_line].l_ioctl(tty,args); |
---|
861 | } else if (tty->handler.ioctl) { |
---|
862 | args->ioctl_return = (*tty->handler.ioctl) (tty->device_context, |
---|
863 | args->command, args->buffer); |
---|
864 | sc = RTEMS_SUCCESSFUL; |
---|
865 | } else { |
---|
866 | sc = RTEMS_INVALID_NUMBER; |
---|
867 | } |
---|
868 | break; |
---|
869 | |
---|
870 | case TIOCGETA: |
---|
871 | *(struct termios *)args->buffer = tty->termios; |
---|
872 | break; |
---|
873 | |
---|
874 | case TIOCSETA: |
---|
875 | case TIOCSETAW: |
---|
876 | case TIOCSETAF: |
---|
877 | tty->termios = *(struct termios *)args->buffer; |
---|
878 | |
---|
879 | if (args->command == TIOCSETAW || args->command == TIOCSETAF) { |
---|
880 | drainOutput (tty); |
---|
881 | if (args->command == TIOCSETAF) { |
---|
882 | flushInput (tty); |
---|
883 | } |
---|
884 | } |
---|
885 | /* check for and process change in flow control options */ |
---|
886 | termios_set_flowctrl(tty); |
---|
887 | |
---|
888 | if (tty->termios.c_lflag & ICANON) { |
---|
889 | tty->rawInBufSemaphoreOptions = RTEMS_WAIT; |
---|
890 | tty->rawInBufSemaphoreTimeout = RTEMS_NO_TIMEOUT; |
---|
891 | tty->rawInBufSemaphoreFirstTimeout = RTEMS_NO_TIMEOUT; |
---|
892 | } else { |
---|
893 | tty->vtimeTicks = tty->termios.c_cc[VTIME] * |
---|
894 | rtems_clock_get_ticks_per_second() / 10; |
---|
895 | if (tty->termios.c_cc[VTIME]) { |
---|
896 | tty->rawInBufSemaphoreOptions = RTEMS_WAIT; |
---|
897 | tty->rawInBufSemaphoreTimeout = tty->vtimeTicks; |
---|
898 | if (tty->termios.c_cc[VMIN]) |
---|
899 | tty->rawInBufSemaphoreFirstTimeout = RTEMS_NO_TIMEOUT; |
---|
900 | else |
---|
901 | tty->rawInBufSemaphoreFirstTimeout = tty->vtimeTicks; |
---|
902 | } else { |
---|
903 | if (tty->termios.c_cc[VMIN]) { |
---|
904 | tty->rawInBufSemaphoreOptions = RTEMS_WAIT; |
---|
905 | tty->rawInBufSemaphoreTimeout = RTEMS_NO_TIMEOUT; |
---|
906 | tty->rawInBufSemaphoreFirstTimeout = RTEMS_NO_TIMEOUT; |
---|
907 | } else { |
---|
908 | tty->rawInBufSemaphoreOptions = RTEMS_NO_WAIT; |
---|
909 | } |
---|
910 | } |
---|
911 | } |
---|
912 | if (tty->handler.set_attributes) { |
---|
913 | sc = (*tty->handler.set_attributes)(tty->device_context, &tty->termios) ? |
---|
914 | RTEMS_SUCCESSFUL : RTEMS_IO_ERROR; |
---|
915 | } |
---|
916 | break; |
---|
917 | |
---|
918 | case TIOCDRAIN: |
---|
919 | drainOutput (tty); |
---|
920 | break; |
---|
921 | |
---|
922 | case TIOCFLUSH: |
---|
923 | if (flags == 0) { |
---|
924 | flags = FREAD | FWRITE; |
---|
925 | } else { |
---|
926 | flags &= FREAD | FWRITE; |
---|
927 | } |
---|
928 | if (flags & FWRITE) { |
---|
929 | flushOutput (tty); |
---|
930 | } |
---|
931 | if (flags & FREAD) { |
---|
932 | flushInput (tty); |
---|
933 | } |
---|
934 | break; |
---|
935 | |
---|
936 | case RTEMS_IO_SNDWAKEUP: |
---|
937 | tty->tty_snd = *wakeup; |
---|
938 | break; |
---|
939 | |
---|
940 | case RTEMS_IO_RCVWAKEUP: |
---|
941 | tty->tty_rcv = *wakeup; |
---|
942 | break; |
---|
943 | |
---|
944 | /* |
---|
945 | * FIXME: add various ioctl code handlers |
---|
946 | */ |
---|
947 | |
---|
948 | #if 1 /* FIXME */ |
---|
949 | case TIOCSETD: |
---|
950 | /* |
---|
951 | * close old line discipline |
---|
952 | */ |
---|
953 | if (rtems_termios_linesw[tty->t_line].l_close != NULL) { |
---|
954 | sc = rtems_termios_linesw[tty->t_line].l_close(tty); |
---|
955 | } |
---|
956 | tty->t_line=*(int*)(args->buffer); |
---|
957 | tty->t_sc = NULL; /* ensure that no more valid data */ |
---|
958 | /* |
---|
959 | * open new line discipline |
---|
960 | */ |
---|
961 | if (rtems_termios_linesw[tty->t_line].l_open != NULL) { |
---|
962 | sc = rtems_termios_linesw[tty->t_line].l_open(tty); |
---|
963 | } |
---|
964 | break; |
---|
965 | case TIOCGETD: |
---|
966 | *(int*)(args->buffer)=tty->t_line; |
---|
967 | break; |
---|
968 | #endif |
---|
969 | case FIONREAD: { |
---|
970 | int rawnc = tty->rawInBuf.Tail - tty->rawInBuf.Head; |
---|
971 | if ( rawnc < 0 ) |
---|
972 | rawnc += tty->rawInBuf.Size; |
---|
973 | /* Half guess that this is the right operation */ |
---|
974 | *(int *)args->buffer = tty->ccount - tty->cindex + rawnc; |
---|
975 | } |
---|
976 | break; |
---|
977 | } |
---|
978 | |
---|
979 | rtems_semaphore_release (tty->osem); |
---|
980 | return sc; |
---|
981 | } |
---|
982 | |
---|
983 | /* |
---|
984 | * Send as many chars at once as possible to device-specific code. |
---|
985 | * If transmitting==true then assume transmission is already running and |
---|
986 | * an explicit write(0) is needed if output has to stop for flow control. |
---|
987 | */ |
---|
988 | static unsigned int |
---|
989 | startXmit ( |
---|
990 | struct rtems_termios_tty *tty, |
---|
991 | unsigned int newTail, |
---|
992 | bool transmitting |
---|
993 | ) |
---|
994 | { |
---|
995 | unsigned int nToSend; |
---|
996 | |
---|
997 | tty->rawOutBufState = rob_busy; |
---|
998 | |
---|
999 | /* if XOFF was received, do not (re)start output */ |
---|
1000 | if (tty->flow_ctrl & FL_ORCVXOF) { |
---|
1001 | /* set flag, that output has been stopped */ |
---|
1002 | tty->flow_ctrl |= FL_OSTOP; |
---|
1003 | nToSend = 0; |
---|
1004 | /* stop transmitter */ |
---|
1005 | if (transmitting) { |
---|
1006 | (*tty->handler.write) (tty->device_context, NULL, 0); |
---|
1007 | } |
---|
1008 | } else { |
---|
1009 | /* when flow control XON or XOF, don't send blocks of data */ |
---|
1010 | /* to allow fast reaction on incoming flow ctrl and low latency*/ |
---|
1011 | /* for outgoing flow control */ |
---|
1012 | if (tty->flow_ctrl & (FL_MDXON | FL_MDXOF)) |
---|
1013 | nToSend = 1; |
---|
1014 | else if (newTail > tty->rawOutBuf.Head) |
---|
1015 | nToSend = tty->rawOutBuf.Size - newTail; |
---|
1016 | else |
---|
1017 | nToSend = tty->rawOutBuf.Head - newTail; |
---|
1018 | |
---|
1019 | (*tty->handler.write)( |
---|
1020 | tty->device_context, &tty->rawOutBuf.theBuf[newTail], nToSend); |
---|
1021 | } |
---|
1022 | |
---|
1023 | return nToSend; |
---|
1024 | } |
---|
1025 | |
---|
1026 | /* |
---|
1027 | * Send characters to device-specific code |
---|
1028 | */ |
---|
1029 | static size_t |
---|
1030 | doTransmit (const char *buf, size_t len, rtems_termios_tty *tty, |
---|
1031 | bool wait, bool nextWait) |
---|
1032 | { |
---|
1033 | unsigned int newHead; |
---|
1034 | rtems_termios_device_context *ctx = tty->device_context; |
---|
1035 | rtems_interrupt_lock_context lock_context; |
---|
1036 | rtems_status_code sc; |
---|
1037 | size_t todo; |
---|
1038 | |
---|
1039 | if (tty->handler.mode == TERMIOS_POLLED) { |
---|
1040 | (*tty->handler.write)(ctx, buf, len); |
---|
1041 | return len; |
---|
1042 | } |
---|
1043 | |
---|
1044 | todo = len; |
---|
1045 | |
---|
1046 | while (todo > 0) { |
---|
1047 | size_t nToCopy; |
---|
1048 | size_t nAvail; |
---|
1049 | |
---|
1050 | /* Check space for at least one char */ |
---|
1051 | newHead = tty->rawOutBuf.Head + 1; |
---|
1052 | if (newHead >= tty->rawOutBuf.Size) |
---|
1053 | newHead -= tty->rawOutBuf.Size; |
---|
1054 | |
---|
1055 | rtems_termios_device_lock_acquire (ctx, &lock_context); |
---|
1056 | if (newHead == tty->rawOutBuf.Tail) { |
---|
1057 | if (wait) { |
---|
1058 | do { |
---|
1059 | tty->rawOutBufState = rob_wait; |
---|
1060 | rtems_termios_device_lock_release (ctx, &lock_context); |
---|
1061 | sc = rtems_semaphore_obtain( |
---|
1062 | tty->rawOutBuf.Semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
1063 | if (sc != RTEMS_SUCCESSFUL) |
---|
1064 | rtems_fatal_error_occurred (sc); |
---|
1065 | rtems_termios_device_lock_acquire (ctx, &lock_context); |
---|
1066 | } while (newHead == tty->rawOutBuf.Tail); |
---|
1067 | } else { |
---|
1068 | rtems_termios_device_lock_release (ctx, &lock_context); |
---|
1069 | return len - todo; |
---|
1070 | } |
---|
1071 | } |
---|
1072 | |
---|
1073 | /* Determine free space up to current tail or end of ring buffer */ |
---|
1074 | nToCopy = todo; |
---|
1075 | if (tty->rawOutBuf.Tail > tty->rawOutBuf.Head) { |
---|
1076 | /* Available space is contiguous from Head to Tail */ |
---|
1077 | nAvail = tty->rawOutBuf.Tail - tty->rawOutBuf.Head - 1; |
---|
1078 | } else { |
---|
1079 | /* Available space wraps at buffer end. To keep it simple, utilize |
---|
1080 | only the free space from Head to end during this iteration */ |
---|
1081 | nAvail = tty->rawOutBuf.Size - tty->rawOutBuf.Head; |
---|
1082 | /* Head may not touch Tail after wraparound */ |
---|
1083 | if (tty->rawOutBuf.Tail == 0) |
---|
1084 | nAvail--; |
---|
1085 | } |
---|
1086 | if (nToCopy > nAvail) |
---|
1087 | nToCopy = nAvail; |
---|
1088 | |
---|
1089 | /* To minimize latency, the memcpy could be done |
---|
1090 | * with interrupts enabled or with limit on nToCopy (TBD) |
---|
1091 | */ |
---|
1092 | memcpy(&tty->rawOutBuf.theBuf[tty->rawOutBuf.Head], buf, nToCopy); |
---|
1093 | |
---|
1094 | newHead = tty->rawOutBuf.Head + nToCopy; |
---|
1095 | if (newHead >= tty->rawOutBuf.Size) |
---|
1096 | newHead -= tty->rawOutBuf.Size; |
---|
1097 | tty->rawOutBuf.Head = newHead; |
---|
1098 | |
---|
1099 | if (tty->rawOutBufState == rob_idle) { |
---|
1100 | startXmit (tty, tty->rawOutBuf.Tail, false); |
---|
1101 | } |
---|
1102 | |
---|
1103 | rtems_termios_device_lock_release (ctx, &lock_context); |
---|
1104 | |
---|
1105 | buf += nToCopy; |
---|
1106 | todo -= nToCopy; |
---|
1107 | wait = nextWait; |
---|
1108 | } |
---|
1109 | |
---|
1110 | return len; |
---|
1111 | } |
---|
1112 | |
---|
1113 | void |
---|
1114 | rtems_termios_puts ( |
---|
1115 | const void *_buf, size_t len, struct rtems_termios_tty *tty) |
---|
1116 | { |
---|
1117 | doTransmit (_buf, len, tty, true, true); |
---|
1118 | } |
---|
1119 | |
---|
1120 | static bool |
---|
1121 | canTransmit (rtems_termios_tty *tty, bool wait, size_t len) |
---|
1122 | { |
---|
1123 | rtems_termios_device_context *ctx; |
---|
1124 | rtems_interrupt_lock_context lock_context; |
---|
1125 | unsigned int capacity; |
---|
1126 | |
---|
1127 | if (wait || tty->handler.mode == TERMIOS_POLLED) { |
---|
1128 | return true; |
---|
1129 | } |
---|
1130 | |
---|
1131 | ctx = tty->device_context; |
---|
1132 | rtems_termios_device_lock_acquire (ctx, &lock_context); |
---|
1133 | capacity = (tty->rawOutBuf.Tail - tty->rawOutBuf.Head - 1) % |
---|
1134 | tty->rawOutBuf.Size; |
---|
1135 | rtems_termios_device_lock_release (ctx, &lock_context); |
---|
1136 | return capacity >= len; |
---|
1137 | } |
---|
1138 | |
---|
1139 | /* |
---|
1140 | * Handle output processing |
---|
1141 | */ |
---|
1142 | static bool |
---|
1143 | oproc (unsigned char c, rtems_termios_tty *tty, bool wait) |
---|
1144 | { |
---|
1145 | char buf[8]; |
---|
1146 | size_t len; |
---|
1147 | |
---|
1148 | buf[0] = c; |
---|
1149 | len = 1; |
---|
1150 | |
---|
1151 | if (tty->termios.c_oflag & OPOST) { |
---|
1152 | int oldColumn = tty->column; |
---|
1153 | int columnAdj = 0; |
---|
1154 | |
---|
1155 | switch (c) { |
---|
1156 | case '\n': |
---|
1157 | if (tty->termios.c_oflag & ONLRET) |
---|
1158 | columnAdj = -oldColumn; |
---|
1159 | if (tty->termios.c_oflag & ONLCR) { |
---|
1160 | len = 2; |
---|
1161 | |
---|
1162 | if (!canTransmit (tty, wait, len)) { |
---|
1163 | return false; |
---|
1164 | } |
---|
1165 | |
---|
1166 | columnAdj = -oldColumn; |
---|
1167 | buf[0] = '\r'; |
---|
1168 | buf[1] = c; |
---|
1169 | } |
---|
1170 | break; |
---|
1171 | |
---|
1172 | case '\r': |
---|
1173 | if ((tty->termios.c_oflag & ONOCR) && (oldColumn == 0)) |
---|
1174 | return true; |
---|
1175 | if (tty->termios.c_oflag & OCRNL) { |
---|
1176 | buf[0] = '\n'; |
---|
1177 | if (tty->termios.c_oflag & ONLRET) |
---|
1178 | columnAdj = -oldColumn; |
---|
1179 | } else { |
---|
1180 | columnAdj = -oldColumn; |
---|
1181 | } |
---|
1182 | break; |
---|
1183 | |
---|
1184 | case '\t': |
---|
1185 | columnAdj = 8 - (oldColumn & 7); |
---|
1186 | if ((tty->termios.c_oflag & TABDLY) == XTABS) { |
---|
1187 | int i; |
---|
1188 | |
---|
1189 | len = (size_t) columnAdj; |
---|
1190 | |
---|
1191 | if (!canTransmit (tty, wait, len)) { |
---|
1192 | return false; |
---|
1193 | } |
---|
1194 | |
---|
1195 | for (i = 0; i < columnAdj; ++i) { |
---|
1196 | buf[i] = ' '; |
---|
1197 | } |
---|
1198 | } |
---|
1199 | break; |
---|
1200 | |
---|
1201 | case '\b': |
---|
1202 | if (oldColumn > 0) |
---|
1203 | columnAdj = -1; |
---|
1204 | break; |
---|
1205 | |
---|
1206 | default: |
---|
1207 | if (tty->termios.c_oflag & OLCUC) { |
---|
1208 | c = toupper(c); |
---|
1209 | buf[0] = c; |
---|
1210 | } |
---|
1211 | if (!iscntrl(c)) |
---|
1212 | columnAdj = 1; |
---|
1213 | break; |
---|
1214 | } |
---|
1215 | |
---|
1216 | tty->column = oldColumn + columnAdj; |
---|
1217 | } |
---|
1218 | |
---|
1219 | return doTransmit (buf, len, tty, wait, true) > 0; |
---|
1220 | } |
---|
1221 | |
---|
1222 | static uint32_t |
---|
1223 | rtems_termios_write_tty (rtems_libio_t *iop, rtems_termios_tty *tty, |
---|
1224 | const char *buf, uint32_t len) |
---|
1225 | { |
---|
1226 | bool wait = ((iop->flags & LIBIO_FLAGS_NO_DELAY) == 0); |
---|
1227 | |
---|
1228 | if (tty->termios.c_oflag & OPOST) { |
---|
1229 | uint32_t todo = len; |
---|
1230 | |
---|
1231 | while (todo > 0) { |
---|
1232 | if (!oproc (*buf, tty, wait)) { |
---|
1233 | break; |
---|
1234 | } |
---|
1235 | |
---|
1236 | ++buf; |
---|
1237 | --todo; |
---|
1238 | wait = false; |
---|
1239 | } |
---|
1240 | |
---|
1241 | return len - todo; |
---|
1242 | } else { |
---|
1243 | return doTransmit (buf, len, tty, wait, false); |
---|
1244 | } |
---|
1245 | } |
---|
1246 | |
---|
1247 | rtems_status_code |
---|
1248 | rtems_termios_write (void *arg) |
---|
1249 | { |
---|
1250 | rtems_libio_rw_args_t *args = arg; |
---|
1251 | struct rtems_termios_tty *tty = args->iop->data1; |
---|
1252 | rtems_status_code sc; |
---|
1253 | |
---|
1254 | sc = rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
1255 | if (sc != RTEMS_SUCCESSFUL) |
---|
1256 | return sc; |
---|
1257 | if (rtems_termios_linesw[tty->t_line].l_write != NULL) { |
---|
1258 | sc = rtems_termios_linesw[tty->t_line].l_write(tty,args); |
---|
1259 | rtems_semaphore_release (tty->osem); |
---|
1260 | return sc; |
---|
1261 | } |
---|
1262 | args->bytes_moved = rtems_termios_write_tty (args->iop, tty, |
---|
1263 | args->buffer, args->count); |
---|
1264 | rtems_semaphore_release (tty->osem); |
---|
1265 | return sc; |
---|
1266 | } |
---|
1267 | |
---|
1268 | /* |
---|
1269 | * Echo a typed character |
---|
1270 | */ |
---|
1271 | static void |
---|
1272 | echo (unsigned char c, struct rtems_termios_tty *tty) |
---|
1273 | { |
---|
1274 | if ((tty->termios.c_lflag & ECHOCTL) && |
---|
1275 | iscntrl(c) && (c != '\t') && (c != '\n')) { |
---|
1276 | char echobuf[2]; |
---|
1277 | |
---|
1278 | echobuf[0] = '^'; |
---|
1279 | echobuf[1] = c ^ 0x40; |
---|
1280 | doTransmit (echobuf, 2, tty, true, true); |
---|
1281 | tty->column += 2; |
---|
1282 | } else { |
---|
1283 | oproc (c, tty, true); |
---|
1284 | } |
---|
1285 | } |
---|
1286 | |
---|
1287 | /* |
---|
1288 | * Erase a character or line |
---|
1289 | * FIXME: Needs support for WERASE and ECHOPRT. |
---|
1290 | * FIXME: Some of the tests should check for IEXTEN, too. |
---|
1291 | */ |
---|
1292 | static void |
---|
1293 | erase (struct rtems_termios_tty *tty, int lineFlag) |
---|
1294 | { |
---|
1295 | if (tty->ccount == 0) |
---|
1296 | return; |
---|
1297 | if (lineFlag) { |
---|
1298 | if (!(tty->termios.c_lflag & ECHO)) { |
---|
1299 | tty->ccount = 0; |
---|
1300 | return; |
---|
1301 | } |
---|
1302 | if (!(tty->termios.c_lflag & ECHOE)) { |
---|
1303 | tty->ccount = 0; |
---|
1304 | echo (tty->termios.c_cc[VKILL], tty); |
---|
1305 | if (tty->termios.c_lflag & ECHOK) |
---|
1306 | echo ('\n', tty); |
---|
1307 | return; |
---|
1308 | } |
---|
1309 | } |
---|
1310 | |
---|
1311 | while (tty->ccount) { |
---|
1312 | unsigned char c = tty->cbuf[--tty->ccount]; |
---|
1313 | |
---|
1314 | if (tty->termios.c_lflag & ECHO) { |
---|
1315 | if (!lineFlag && !(tty->termios.c_lflag & ECHOE)) { |
---|
1316 | echo (tty->termios.c_cc[VERASE], tty); |
---|
1317 | } else if (c == '\t') { |
---|
1318 | int col = tty->read_start_column; |
---|
1319 | int i = 0; |
---|
1320 | |
---|
1321 | /* |
---|
1322 | * Find the character before the tab |
---|
1323 | */ |
---|
1324 | while (i != tty->ccount) { |
---|
1325 | c = tty->cbuf[i++]; |
---|
1326 | if (c == '\t') { |
---|
1327 | col = (col | 7) + 1; |
---|
1328 | } else if (iscntrl (c)) { |
---|
1329 | if (tty->termios.c_lflag & ECHOCTL) |
---|
1330 | col += 2; |
---|
1331 | } else { |
---|
1332 | col++; |
---|
1333 | } |
---|
1334 | } |
---|
1335 | |
---|
1336 | /* |
---|
1337 | * Back up over the tab |
---|
1338 | */ |
---|
1339 | while (tty->column > col) { |
---|
1340 | doTransmit ("\b", 1, tty, true, true); |
---|
1341 | tty->column--; |
---|
1342 | } |
---|
1343 | } |
---|
1344 | else { |
---|
1345 | if (iscntrl (c) && (tty->termios.c_lflag & ECHOCTL)) { |
---|
1346 | doTransmit ("\b \b", 3, tty, true, true); |
---|
1347 | if (tty->column) |
---|
1348 | tty->column--; |
---|
1349 | } |
---|
1350 | if (!iscntrl (c) || (tty->termios.c_lflag & ECHOCTL)) { |
---|
1351 | doTransmit ("\b \b", 3, tty, true, true); |
---|
1352 | if (tty->column) |
---|
1353 | tty->column--; |
---|
1354 | } |
---|
1355 | } |
---|
1356 | } |
---|
1357 | if (!lineFlag) |
---|
1358 | break; |
---|
1359 | } |
---|
1360 | } |
---|
1361 | |
---|
1362 | static unsigned char |
---|
1363 | iprocEarly (unsigned char c, rtems_termios_tty *tty) |
---|
1364 | { |
---|
1365 | if (tty->termios.c_iflag & ISTRIP) |
---|
1366 | c &= 0x7f; |
---|
1367 | |
---|
1368 | if (tty->termios.c_iflag & IUCLC) |
---|
1369 | c = tolower (c); |
---|
1370 | |
---|
1371 | if (c == '\r') { |
---|
1372 | if (tty->termios.c_iflag & ICRNL) |
---|
1373 | c = '\n'; |
---|
1374 | } else if (c == '\n') { |
---|
1375 | if (tty->termios.c_iflag & INLCR) |
---|
1376 | c = '\r'; |
---|
1377 | } |
---|
1378 | |
---|
1379 | return c; |
---|
1380 | } |
---|
1381 | |
---|
1382 | /* |
---|
1383 | * Process a single input character |
---|
1384 | */ |
---|
1385 | static int |
---|
1386 | iproc (unsigned char c, struct rtems_termios_tty *tty) |
---|
1387 | { |
---|
1388 | if ((c != '\0') && (tty->termios.c_lflag & ICANON)) { |
---|
1389 | if (c == tty->termios.c_cc[VERASE]) { |
---|
1390 | erase (tty, 0); |
---|
1391 | return 0; |
---|
1392 | } |
---|
1393 | else if (c == tty->termios.c_cc[VKILL]) { |
---|
1394 | erase (tty, 1); |
---|
1395 | return 0; |
---|
1396 | } |
---|
1397 | else if (c == tty->termios.c_cc[VEOF]) { |
---|
1398 | return 1; |
---|
1399 | } else if (c == '\n') { |
---|
1400 | if (tty->termios.c_lflag & (ECHO | ECHONL)) |
---|
1401 | echo (c, tty); |
---|
1402 | tty->cbuf[tty->ccount++] = c; |
---|
1403 | return 1; |
---|
1404 | } else if ((c == tty->termios.c_cc[VEOL]) || |
---|
1405 | (c == tty->termios.c_cc[VEOL2])) { |
---|
1406 | if (tty->termios.c_lflag & ECHO) |
---|
1407 | echo (c, tty); |
---|
1408 | tty->cbuf[tty->ccount++] = c; |
---|
1409 | return 1; |
---|
1410 | } |
---|
1411 | } |
---|
1412 | |
---|
1413 | /* |
---|
1414 | * FIXME: Should do IMAXBEL handling somehow |
---|
1415 | */ |
---|
1416 | if (tty->ccount < (CBUFSIZE-1)) { |
---|
1417 | if (tty->termios.c_lflag & ECHO) |
---|
1418 | echo (c, tty); |
---|
1419 | tty->cbuf[tty->ccount++] = c; |
---|
1420 | } |
---|
1421 | return 0; |
---|
1422 | } |
---|
1423 | |
---|
1424 | /* |
---|
1425 | * Process input character, with semaphore. |
---|
1426 | */ |
---|
1427 | static int |
---|
1428 | siproc (unsigned char c, struct rtems_termios_tty *tty) |
---|
1429 | { |
---|
1430 | int i; |
---|
1431 | |
---|
1432 | /* |
---|
1433 | * Obtain output semaphore if character will be echoed |
---|
1434 | */ |
---|
1435 | if (tty->termios.c_lflag & (ECHO|ECHOE|ECHOK|ECHONL|ECHOPRT|ECHOCTL|ECHOKE)) { |
---|
1436 | rtems_status_code sc; |
---|
1437 | sc = rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
1438 | if (sc != RTEMS_SUCCESSFUL) |
---|
1439 | rtems_fatal_error_occurred (sc); |
---|
1440 | i = iproc (c, tty); |
---|
1441 | sc = rtems_semaphore_release (tty->osem); |
---|
1442 | if (sc != RTEMS_SUCCESSFUL) |
---|
1443 | rtems_fatal_error_occurred (sc); |
---|
1444 | } |
---|
1445 | else { |
---|
1446 | i = iproc (c, tty); |
---|
1447 | } |
---|
1448 | return i; |
---|
1449 | } |
---|
1450 | |
---|
1451 | static int |
---|
1452 | siprocPoll (unsigned char c, rtems_termios_tty *tty) |
---|
1453 | { |
---|
1454 | if (c == '\r' && (tty->termios.c_iflag & IGNCR) != 0) { |
---|
1455 | return 0; |
---|
1456 | } |
---|
1457 | |
---|
1458 | c = iprocEarly (c, tty); |
---|
1459 | return siproc (c, tty); |
---|
1460 | } |
---|
1461 | |
---|
1462 | /* |
---|
1463 | * Fill the input buffer by polling the device |
---|
1464 | */ |
---|
1465 | static void |
---|
1466 | fillBufferPoll (struct rtems_termios_tty *tty) |
---|
1467 | { |
---|
1468 | int n; |
---|
1469 | |
---|
1470 | if (tty->termios.c_lflag & ICANON) { |
---|
1471 | for (;;) { |
---|
1472 | n = (*tty->handler.poll_read)(tty->device_context); |
---|
1473 | if (n < 0) { |
---|
1474 | rtems_task_wake_after (1); |
---|
1475 | } else { |
---|
1476 | if (siprocPoll (n, tty)) |
---|
1477 | break; |
---|
1478 | } |
---|
1479 | } |
---|
1480 | } else { |
---|
1481 | rtems_interval then, now; |
---|
1482 | |
---|
1483 | then = rtems_clock_get_ticks_since_boot(); |
---|
1484 | for (;;) { |
---|
1485 | n = (*tty->handler.poll_read)(tty->device_context); |
---|
1486 | if (n < 0) { |
---|
1487 | if (tty->termios.c_cc[VMIN]) { |
---|
1488 | if (tty->termios.c_cc[VTIME] && tty->ccount) { |
---|
1489 | now = rtems_clock_get_ticks_since_boot(); |
---|
1490 | if ((now - then) > tty->vtimeTicks) { |
---|
1491 | break; |
---|
1492 | } |
---|
1493 | } |
---|
1494 | } else { |
---|
1495 | if (!tty->termios.c_cc[VTIME]) |
---|
1496 | break; |
---|
1497 | now = rtems_clock_get_ticks_since_boot(); |
---|
1498 | if ((now - then) > tty->vtimeTicks) { |
---|
1499 | break; |
---|
1500 | } |
---|
1501 | } |
---|
1502 | rtems_task_wake_after (1); |
---|
1503 | } else { |
---|
1504 | siprocPoll (n, tty); |
---|
1505 | if (tty->ccount >= tty->termios.c_cc[VMIN]) |
---|
1506 | break; |
---|
1507 | if (tty->termios.c_cc[VMIN] && tty->termios.c_cc[VTIME]) |
---|
1508 | then = rtems_clock_get_ticks_since_boot(); |
---|
1509 | } |
---|
1510 | } |
---|
1511 | } |
---|
1512 | } |
---|
1513 | |
---|
1514 | /* |
---|
1515 | * Fill the input buffer from the raw input queue |
---|
1516 | */ |
---|
1517 | static void |
---|
1518 | fillBufferQueue (struct rtems_termios_tty *tty) |
---|
1519 | { |
---|
1520 | rtems_termios_device_context *ctx = tty->device_context; |
---|
1521 | rtems_interval timeout = tty->rawInBufSemaphoreFirstTimeout; |
---|
1522 | bool wait = true; |
---|
1523 | |
---|
1524 | while ( wait ) { |
---|
1525 | rtems_interrupt_lock_context lock_context; |
---|
1526 | |
---|
1527 | /* |
---|
1528 | * Process characters read from raw queue |
---|
1529 | */ |
---|
1530 | |
---|
1531 | rtems_termios_device_lock_acquire (ctx, &lock_context); |
---|
1532 | |
---|
1533 | while ((tty->rawInBuf.Head != tty->rawInBuf.Tail) && |
---|
1534 | (tty->ccount < (CBUFSIZE-1))) { |
---|
1535 | unsigned char c; |
---|
1536 | unsigned int newHead; |
---|
1537 | |
---|
1538 | newHead = (tty->rawInBuf.Head + 1) % tty->rawInBuf.Size; |
---|
1539 | c = tty->rawInBuf.theBuf[newHead]; |
---|
1540 | tty->rawInBuf.Head = newHead; |
---|
1541 | |
---|
1542 | if(((tty->rawInBuf.Tail - newHead) % tty->rawInBuf.Size) |
---|
1543 | < tty->lowwater) { |
---|
1544 | tty->flow_ctrl &= ~FL_IREQXOF; |
---|
1545 | /* if tx stopped and XON should be sent... */ |
---|
1546 | if (((tty->flow_ctrl & (FL_MDXON | FL_ISNTXOF)) |
---|
1547 | == (FL_MDXON | FL_ISNTXOF)) |
---|
1548 | && ((tty->rawOutBufState == rob_idle) |
---|
1549 | || (tty->flow_ctrl & FL_OSTOP))) { |
---|
1550 | /* XON should be sent now... */ |
---|
1551 | (*tty->handler.write)( |
---|
1552 | tty->device_context, (void *)&(tty->termios.c_cc[VSTART]), 1); |
---|
1553 | } else if (tty->flow_ctrl & FL_MDRTS) { |
---|
1554 | tty->flow_ctrl &= ~FL_IRTSOFF; |
---|
1555 | /* activate RTS line */ |
---|
1556 | if (tty->flow.start_remote_tx != NULL) { |
---|
1557 | tty->flow.start_remote_tx(tty->device_context); |
---|
1558 | } |
---|
1559 | } |
---|
1560 | } |
---|
1561 | |
---|
1562 | rtems_termios_device_lock_release (ctx, &lock_context); |
---|
1563 | |
---|
1564 | /* continue processing new character */ |
---|
1565 | if (tty->termios.c_lflag & ICANON) { |
---|
1566 | if (siproc (c, tty)) |
---|
1567 | wait = false; |
---|
1568 | } else { |
---|
1569 | siproc (c, tty); |
---|
1570 | if (tty->ccount >= tty->termios.c_cc[VMIN]) |
---|
1571 | wait = false; |
---|
1572 | } |
---|
1573 | timeout = tty->rawInBufSemaphoreTimeout; |
---|
1574 | |
---|
1575 | rtems_termios_device_lock_acquire (ctx, &lock_context); |
---|
1576 | } |
---|
1577 | |
---|
1578 | rtems_termios_device_lock_release (ctx, &lock_context); |
---|
1579 | |
---|
1580 | /* |
---|
1581 | * Wait for characters |
---|
1582 | */ |
---|
1583 | if (wait) { |
---|
1584 | if (tty->ccount < CBUFSIZE - 1) { |
---|
1585 | rtems_status_code sc; |
---|
1586 | |
---|
1587 | sc = rtems_semaphore_obtain( |
---|
1588 | tty->rawInBuf.Semaphore, tty->rawInBufSemaphoreOptions, timeout); |
---|
1589 | if (sc != RTEMS_SUCCESSFUL) |
---|
1590 | break; |
---|
1591 | } else { |
---|
1592 | break; |
---|
1593 | } |
---|
1594 | } |
---|
1595 | } |
---|
1596 | } |
---|
1597 | |
---|
1598 | static uint32_t |
---|
1599 | rtems_termios_read_tty (struct rtems_termios_tty *tty, char *buffer, |
---|
1600 | uint32_t initial_count) |
---|
1601 | { |
---|
1602 | uint32_t count; |
---|
1603 | |
---|
1604 | count = initial_count; |
---|
1605 | |
---|
1606 | if (tty->cindex == tty->ccount) { |
---|
1607 | tty->cindex = tty->ccount = 0; |
---|
1608 | tty->read_start_column = tty->column; |
---|
1609 | if (tty->handler.poll_read != NULL && tty->handler.mode == TERMIOS_POLLED) |
---|
1610 | fillBufferPoll (tty); |
---|
1611 | else |
---|
1612 | fillBufferQueue (tty); |
---|
1613 | } |
---|
1614 | while (count && (tty->cindex < tty->ccount)) { |
---|
1615 | *buffer++ = tty->cbuf[tty->cindex++]; |
---|
1616 | count--; |
---|
1617 | } |
---|
1618 | tty->tty_rcvwakeup = false; |
---|
1619 | return initial_count - count; |
---|
1620 | } |
---|
1621 | |
---|
1622 | rtems_status_code |
---|
1623 | rtems_termios_read (void *arg) |
---|
1624 | { |
---|
1625 | rtems_libio_rw_args_t *args = arg; |
---|
1626 | struct rtems_termios_tty *tty = args->iop->data1; |
---|
1627 | rtems_status_code sc; |
---|
1628 | |
---|
1629 | sc = rtems_semaphore_obtain (tty->isem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
1630 | if (sc != RTEMS_SUCCESSFUL) |
---|
1631 | return sc; |
---|
1632 | |
---|
1633 | if (rtems_termios_linesw[tty->t_line].l_read != NULL) { |
---|
1634 | sc = rtems_termios_linesw[tty->t_line].l_read(tty,args); |
---|
1635 | tty->tty_rcvwakeup = false; |
---|
1636 | rtems_semaphore_release (tty->isem); |
---|
1637 | return sc; |
---|
1638 | } |
---|
1639 | |
---|
1640 | args->bytes_moved = rtems_termios_read_tty (tty, args->buffer, args->count); |
---|
1641 | rtems_semaphore_release (tty->isem); |
---|
1642 | return sc; |
---|
1643 | } |
---|
1644 | |
---|
1645 | /* |
---|
1646 | * signal receive interrupt to rx daemon |
---|
1647 | * NOTE: This routine runs in the context of the |
---|
1648 | * device receive interrupt handler. |
---|
1649 | */ |
---|
1650 | void rtems_termios_rxirq_occured(struct rtems_termios_tty *tty) |
---|
1651 | { |
---|
1652 | /* |
---|
1653 | * send event to rx daemon task |
---|
1654 | */ |
---|
1655 | rtems_event_send(tty->rxTaskId,TERMIOS_RX_PROC_EVENT); |
---|
1656 | } |
---|
1657 | |
---|
1658 | static bool |
---|
1659 | mustCallReceiveCallback (const rtems_termios_tty *tty, unsigned char c, |
---|
1660 | unsigned int newTail, unsigned int head) |
---|
1661 | { |
---|
1662 | if ((tty->termios.c_lflag & ICANON) != 0) { |
---|
1663 | return c == '\n' || c == tty->termios.c_cc[VEOF] || |
---|
1664 | c == tty->termios.c_cc[VEOL] || c == tty->termios.c_cc[VEOL2]; |
---|
1665 | } else { |
---|
1666 | unsigned int rawContentSize = (newTail - head) % tty->rawInBuf.Size; |
---|
1667 | |
---|
1668 | return rawContentSize >= tty->termios.c_cc[VMIN]; |
---|
1669 | } |
---|
1670 | } |
---|
1671 | |
---|
1672 | /* |
---|
1673 | * Place characters on raw queue. |
---|
1674 | * NOTE: This routine runs in the context of the |
---|
1675 | * device receive interrupt handler. |
---|
1676 | * Returns the number of characters dropped because of overflow. |
---|
1677 | */ |
---|
1678 | int |
---|
1679 | rtems_termios_enqueue_raw_characters (void *ttyp, const char *buf, int len) |
---|
1680 | { |
---|
1681 | struct rtems_termios_tty *tty = ttyp; |
---|
1682 | char c; |
---|
1683 | int dropped = 0; |
---|
1684 | bool flow_rcv = false; /* true, if flow control char received */ |
---|
1685 | rtems_termios_device_context *ctx = tty->device_context; |
---|
1686 | rtems_interrupt_lock_context lock_context; |
---|
1687 | |
---|
1688 | if (rtems_termios_linesw[tty->t_line].l_rint != NULL) { |
---|
1689 | while (len--) { |
---|
1690 | c = *buf++; |
---|
1691 | rtems_termios_linesw[tty->t_line].l_rint(c,tty); |
---|
1692 | } |
---|
1693 | |
---|
1694 | /* |
---|
1695 | * check to see if rcv wakeup callback was set |
---|
1696 | */ |
---|
1697 | if (tty->tty_rcv.sw_pfn != NULL && !tty->tty_rcvwakeup) { |
---|
1698 | tty->tty_rcvwakeup = true; |
---|
1699 | (*tty->tty_rcv.sw_pfn)(&tty->termios, tty->tty_rcv.sw_arg); |
---|
1700 | } |
---|
1701 | return 0; |
---|
1702 | } |
---|
1703 | |
---|
1704 | while (len--) { |
---|
1705 | c = *buf++; |
---|
1706 | /* FIXME: implement IXANY: any character restarts output */ |
---|
1707 | /* if incoming XON/XOFF controls outgoing stream: */ |
---|
1708 | if (tty->flow_ctrl & FL_MDXON) { |
---|
1709 | /* if received char is V_STOP and V_START (both are equal value) */ |
---|
1710 | if (c == tty->termios.c_cc[VSTOP]) { |
---|
1711 | if (c == tty->termios.c_cc[VSTART]) { |
---|
1712 | /* received VSTOP and VSTART==VSTOP? */ |
---|
1713 | /* then toggle "stop output" status */ |
---|
1714 | tty->flow_ctrl = tty->flow_ctrl ^ FL_ORCVXOF; |
---|
1715 | } |
---|
1716 | else { |
---|
1717 | /* VSTOP received (other code than VSTART) */ |
---|
1718 | /* stop output */ |
---|
1719 | tty->flow_ctrl |= FL_ORCVXOF; |
---|
1720 | } |
---|
1721 | flow_rcv = true; |
---|
1722 | } |
---|
1723 | else if (c == tty->termios.c_cc[VSTART]) { |
---|
1724 | /* VSTART received */ |
---|
1725 | /* restart output */ |
---|
1726 | tty->flow_ctrl &= ~FL_ORCVXOF; |
---|
1727 | flow_rcv = true; |
---|
1728 | } |
---|
1729 | } |
---|
1730 | if (flow_rcv) { |
---|
1731 | /* restart output according to FL_ORCVXOF flag */ |
---|
1732 | if ((tty->flow_ctrl & (FL_ORCVXOF | FL_OSTOP)) == FL_OSTOP) { |
---|
1733 | /* disable interrupts */ |
---|
1734 | rtems_termios_device_lock_acquire (ctx, &lock_context); |
---|
1735 | tty->flow_ctrl &= ~FL_OSTOP; |
---|
1736 | /* check for chars in output buffer (or rob_state?) */ |
---|
1737 | if (tty->rawOutBufState != rob_idle) { |
---|
1738 | /* if chars available, call write function... */ |
---|
1739 | (*tty->handler.write)( |
---|
1740 | ctx, &tty->rawOutBuf.theBuf[tty->rawOutBuf.Tail], 1); |
---|
1741 | } |
---|
1742 | /* reenable interrupts */ |
---|
1743 | rtems_termios_device_lock_release (ctx, &lock_context); |
---|
1744 | } |
---|
1745 | } else { |
---|
1746 | unsigned int head; |
---|
1747 | unsigned int oldTail; |
---|
1748 | unsigned int newTail; |
---|
1749 | bool callReciveCallback; |
---|
1750 | |
---|
1751 | if (c == '\r' && (tty->termios.c_iflag & IGNCR) != 0) { |
---|
1752 | continue; |
---|
1753 | } |
---|
1754 | |
---|
1755 | c = iprocEarly (c, tty); |
---|
1756 | |
---|
1757 | rtems_termios_device_lock_acquire (ctx, &lock_context); |
---|
1758 | |
---|
1759 | head = tty->rawInBuf.Head; |
---|
1760 | oldTail = tty->rawInBuf.Tail; |
---|
1761 | newTail = (oldTail + 1) % tty->rawInBuf.Size; |
---|
1762 | |
---|
1763 | /* if chars_in_buffer > highwater */ |
---|
1764 | if ((tty->flow_ctrl & FL_IREQXOF) != 0 && (((newTail - head) % |
---|
1765 | tty->rawInBuf.Size) > tty->highwater)) { |
---|
1766 | /* incoming data stream should be stopped */ |
---|
1767 | tty->flow_ctrl |= FL_IREQXOF; |
---|
1768 | if ((tty->flow_ctrl & (FL_MDXOF | FL_ISNTXOF)) |
---|
1769 | == (FL_MDXOF ) ) { |
---|
1770 | if ((tty->flow_ctrl & FL_OSTOP) || |
---|
1771 | (tty->rawOutBufState == rob_idle)) { |
---|
1772 | /* if tx is stopped due to XOFF or out of data */ |
---|
1773 | /* call write function here */ |
---|
1774 | tty->flow_ctrl |= FL_ISNTXOF; |
---|
1775 | (*tty->handler.write)(ctx, |
---|
1776 | (void *)&(tty->termios.c_cc[VSTOP]), 1); |
---|
1777 | } |
---|
1778 | } else if ((tty->flow_ctrl & (FL_MDRTS | FL_IRTSOFF)) == (FL_MDRTS) ) { |
---|
1779 | tty->flow_ctrl |= FL_IRTSOFF; |
---|
1780 | /* deactivate RTS line */ |
---|
1781 | if (tty->flow.stop_remote_tx != NULL) { |
---|
1782 | tty->flow.stop_remote_tx(ctx); |
---|
1783 | } |
---|
1784 | } |
---|
1785 | } |
---|
1786 | |
---|
1787 | callReciveCallback = false; |
---|
1788 | |
---|
1789 | if (newTail != head) { |
---|
1790 | tty->rawInBuf.theBuf[newTail] = c; |
---|
1791 | tty->rawInBuf.Tail = newTail; |
---|
1792 | |
---|
1793 | /* |
---|
1794 | * check to see if rcv wakeup callback was set |
---|
1795 | */ |
---|
1796 | if (tty->tty_rcv.sw_pfn != NULL && !tty->tty_rcvwakeup) { |
---|
1797 | if (mustCallReceiveCallback (tty, c, newTail, head)) { |
---|
1798 | tty->tty_rcvwakeup = true; |
---|
1799 | callReciveCallback = true; |
---|
1800 | } |
---|
1801 | } |
---|
1802 | } else { |
---|
1803 | ++dropped; |
---|
1804 | |
---|
1805 | if (tty->tty_rcv.sw_pfn != NULL && !tty->tty_rcvwakeup) { |
---|
1806 | tty->tty_rcvwakeup = true; |
---|
1807 | callReciveCallback = true; |
---|
1808 | } |
---|
1809 | } |
---|
1810 | |
---|
1811 | rtems_termios_device_lock_release (ctx, &lock_context); |
---|
1812 | |
---|
1813 | if (callReciveCallback) { |
---|
1814 | (*tty->tty_rcv.sw_pfn)(&tty->termios, tty->tty_rcv.sw_arg); |
---|
1815 | } |
---|
1816 | } |
---|
1817 | } |
---|
1818 | |
---|
1819 | tty->rawInBufDropped += dropped; |
---|
1820 | rtems_semaphore_release (tty->rawInBuf.Semaphore); |
---|
1821 | return dropped; |
---|
1822 | } |
---|
1823 | |
---|
1824 | /* |
---|
1825 | * in task-driven mode, this function is called in Tx task context |
---|
1826 | * in interrupt-driven mode, this function is called in TxIRQ context |
---|
1827 | */ |
---|
1828 | static int |
---|
1829 | rtems_termios_refill_transmitter (struct rtems_termios_tty *tty) |
---|
1830 | { |
---|
1831 | bool wakeUpWriterTask = false; |
---|
1832 | unsigned int newTail; |
---|
1833 | int nToSend; |
---|
1834 | rtems_termios_device_context *ctx = tty->device_context; |
---|
1835 | rtems_interrupt_lock_context lock_context; |
---|
1836 | int len; |
---|
1837 | |
---|
1838 | rtems_termios_device_lock_acquire (ctx, &lock_context); |
---|
1839 | |
---|
1840 | /* check for XOF/XON to send */ |
---|
1841 | if ((tty->flow_ctrl & (FL_MDXOF | FL_IREQXOF | FL_ISNTXOF)) |
---|
1842 | == (FL_MDXOF | FL_IREQXOF)) { |
---|
1843 | /* XOFF should be sent now... */ |
---|
1844 | (*tty->handler.write)(ctx, (void *)&(tty->termios.c_cc[VSTOP]), 1); |
---|
1845 | |
---|
1846 | tty->t_dqlen--; |
---|
1847 | tty->flow_ctrl |= FL_ISNTXOF; |
---|
1848 | |
---|
1849 | nToSend = 1; |
---|
1850 | |
---|
1851 | } else if ((tty->flow_ctrl & (FL_IREQXOF | FL_ISNTXOF)) == FL_ISNTXOF) { |
---|
1852 | /* NOTE: send XON even, if no longer in XON/XOFF mode... */ |
---|
1853 | /* XON should be sent now... */ |
---|
1854 | /* |
---|
1855 | * FIXME: this .write call will generate another |
---|
1856 | * dequeue callback. This will advance the "Tail" in the data |
---|
1857 | * buffer, although the corresponding data is not yet out! |
---|
1858 | * Therefore the dequeue "length" should be reduced by 1 |
---|
1859 | */ |
---|
1860 | (*tty->handler.write)(ctx, (void *)&(tty->termios.c_cc[VSTART]), 1); |
---|
1861 | |
---|
1862 | tty->t_dqlen--; |
---|
1863 | tty->flow_ctrl &= ~FL_ISNTXOF; |
---|
1864 | |
---|
1865 | nToSend = 1; |
---|
1866 | } else if ( tty->rawOutBuf.Head == tty->rawOutBuf.Tail ) { |
---|
1867 | /* |
---|
1868 | * buffer was empty |
---|
1869 | */ |
---|
1870 | if (tty->rawOutBufState == rob_wait) { |
---|
1871 | /* |
---|
1872 | * this should never happen... |
---|
1873 | */ |
---|
1874 | wakeUpWriterTask = true; |
---|
1875 | } |
---|
1876 | |
---|
1877 | (*tty->handler.write) (ctx, NULL, 0); |
---|
1878 | nToSend = 0; |
---|
1879 | } else { |
---|
1880 | len = tty->t_dqlen; |
---|
1881 | tty->t_dqlen = 0; |
---|
1882 | |
---|
1883 | newTail = (tty->rawOutBuf.Tail + len) % tty->rawOutBuf.Size; |
---|
1884 | tty->rawOutBuf.Tail = newTail; |
---|
1885 | if (tty->rawOutBufState == rob_wait) { |
---|
1886 | /* |
---|
1887 | * wake up any pending writer task |
---|
1888 | */ |
---|
1889 | wakeUpWriterTask = true; |
---|
1890 | } |
---|
1891 | |
---|
1892 | if (newTail == tty->rawOutBuf.Head) { |
---|
1893 | /* |
---|
1894 | * Buffer has become empty |
---|
1895 | */ |
---|
1896 | tty->rawOutBufState = rob_idle; |
---|
1897 | (*tty->handler.write) (ctx, NULL, 0); |
---|
1898 | nToSend = 0; |
---|
1899 | |
---|
1900 | /* |
---|
1901 | * check to see if snd wakeup callback was set |
---|
1902 | */ |
---|
1903 | if ( tty->tty_snd.sw_pfn != NULL) { |
---|
1904 | (*tty->tty_snd.sw_pfn)(&tty->termios, tty->tty_snd.sw_arg); |
---|
1905 | } |
---|
1906 | } else { |
---|
1907 | /* |
---|
1908 | * Buffer not empty, check flow control, start transmitter |
---|
1909 | */ |
---|
1910 | nToSend = startXmit (tty, newTail, true); |
---|
1911 | } |
---|
1912 | } |
---|
1913 | |
---|
1914 | rtems_termios_device_lock_release (ctx, &lock_context); |
---|
1915 | |
---|
1916 | if (wakeUpWriterTask) { |
---|
1917 | rtems_semaphore_release (tty->rawOutBuf.Semaphore); |
---|
1918 | } |
---|
1919 | |
---|
1920 | return nToSend; |
---|
1921 | } |
---|
1922 | |
---|
1923 | /* |
---|
1924 | * Characters have been transmitted |
---|
1925 | * NOTE: This routine runs in the context of the |
---|
1926 | * device transmit interrupt handler. |
---|
1927 | * The second argument is the number of characters transmitted so far. |
---|
1928 | * This value will always be 1 for devices which generate an interrupt |
---|
1929 | * for each transmitted character. |
---|
1930 | * It returns number of characters left to transmit |
---|
1931 | */ |
---|
1932 | int |
---|
1933 | rtems_termios_dequeue_characters (void *ttyp, int len) |
---|
1934 | { |
---|
1935 | struct rtems_termios_tty *tty = ttyp; |
---|
1936 | rtems_status_code sc; |
---|
1937 | |
---|
1938 | /* |
---|
1939 | * sum up character count already sent |
---|
1940 | */ |
---|
1941 | tty->t_dqlen += len; |
---|
1942 | |
---|
1943 | if (tty->handler.mode == TERMIOS_TASK_DRIVEN) { |
---|
1944 | /* |
---|
1945 | * send wake up to transmitter task |
---|
1946 | */ |
---|
1947 | sc = rtems_event_send(tty->txTaskId, TERMIOS_TX_START_EVENT); |
---|
1948 | if (sc != RTEMS_SUCCESSFUL) |
---|
1949 | rtems_fatal_error_occurred (sc); |
---|
1950 | return 0; /* nothing to output in IRQ... */ |
---|
1951 | } |
---|
1952 | |
---|
1953 | if (tty->t_line == PPPDISC ) { |
---|
1954 | /* |
---|
1955 | * call PPP line discipline start function |
---|
1956 | */ |
---|
1957 | if (rtems_termios_linesw[tty->t_line].l_start != NULL) { |
---|
1958 | rtems_termios_linesw[tty->t_line].l_start(tty); |
---|
1959 | } |
---|
1960 | return 0; /* nothing to output in IRQ... */ |
---|
1961 | } |
---|
1962 | |
---|
1963 | return rtems_termios_refill_transmitter(tty); |
---|
1964 | } |
---|
1965 | |
---|
1966 | /* |
---|
1967 | * this task actually processes any transmit events |
---|
1968 | */ |
---|
1969 | static rtems_task rtems_termios_txdaemon(rtems_task_argument argument) |
---|
1970 | { |
---|
1971 | struct rtems_termios_tty *tty = (struct rtems_termios_tty *)argument; |
---|
1972 | rtems_event_set the_event; |
---|
1973 | |
---|
1974 | while (1) { |
---|
1975 | /* |
---|
1976 | * wait for rtems event |
---|
1977 | */ |
---|
1978 | rtems_event_receive( |
---|
1979 | (TERMIOS_TX_START_EVENT | TERMIOS_TX_TERMINATE_EVENT), |
---|
1980 | RTEMS_EVENT_ANY | RTEMS_WAIT, |
---|
1981 | RTEMS_NO_TIMEOUT, |
---|
1982 | &the_event |
---|
1983 | ); |
---|
1984 | if ((the_event & TERMIOS_TX_TERMINATE_EVENT) != 0) { |
---|
1985 | tty->txTaskId = 0; |
---|
1986 | rtems_task_delete(RTEMS_SELF); |
---|
1987 | } |
---|
1988 | |
---|
1989 | /* |
---|
1990 | * call any line discipline start function |
---|
1991 | */ |
---|
1992 | if (rtems_termios_linesw[tty->t_line].l_start != NULL) { |
---|
1993 | rtems_termios_linesw[tty->t_line].l_start(tty); |
---|
1994 | |
---|
1995 | if (tty->t_line == PPPDISC) { |
---|
1996 | /* |
---|
1997 | * Do not call rtems_termios_refill_transmitter() in this case similar |
---|
1998 | * to rtems_termios_dequeue_characters(). |
---|
1999 | */ |
---|
2000 | continue; |
---|
2001 | } |
---|
2002 | } |
---|
2003 | |
---|
2004 | /* |
---|
2005 | * try to push further characters to device |
---|
2006 | */ |
---|
2007 | rtems_termios_refill_transmitter(tty); |
---|
2008 | } |
---|
2009 | } |
---|
2010 | |
---|
2011 | /* |
---|
2012 | * this task actually processes any receive events |
---|
2013 | */ |
---|
2014 | static rtems_task rtems_termios_rxdaemon(rtems_task_argument argument) |
---|
2015 | { |
---|
2016 | struct rtems_termios_tty *tty = (struct rtems_termios_tty *)argument; |
---|
2017 | rtems_termios_device_context *ctx = tty->device_context; |
---|
2018 | rtems_event_set the_event; |
---|
2019 | int c; |
---|
2020 | char c_buf; |
---|
2021 | |
---|
2022 | while (1) { |
---|
2023 | /* |
---|
2024 | * wait for rtems event |
---|
2025 | */ |
---|
2026 | rtems_event_receive( |
---|
2027 | (TERMIOS_RX_PROC_EVENT | TERMIOS_RX_TERMINATE_EVENT), |
---|
2028 | RTEMS_EVENT_ANY | RTEMS_WAIT, |
---|
2029 | RTEMS_NO_TIMEOUT, |
---|
2030 | &the_event |
---|
2031 | ); |
---|
2032 | if ((the_event & TERMIOS_RX_TERMINATE_EVENT) != 0) { |
---|
2033 | tty->rxTaskId = 0; |
---|
2034 | rtems_task_delete(RTEMS_SELF); |
---|
2035 | } |
---|
2036 | |
---|
2037 | /* |
---|
2038 | * do something |
---|
2039 | */ |
---|
2040 | c = tty->handler.poll_read(ctx); |
---|
2041 | if (c != EOF) { |
---|
2042 | /* |
---|
2043 | * poll_read did call enqueue on its own |
---|
2044 | */ |
---|
2045 | c_buf = c; |
---|
2046 | rtems_termios_enqueue_raw_characters ( tty,&c_buf,1); |
---|
2047 | } |
---|
2048 | } |
---|
2049 | } |
---|
2050 | |
---|
2051 | static int |
---|
2052 | rtems_termios_imfs_open (rtems_libio_t *iop, |
---|
2053 | const char *path, int oflag, mode_t mode) |
---|
2054 | { |
---|
2055 | rtems_termios_device_node *device_node; |
---|
2056 | rtems_status_code sc; |
---|
2057 | rtems_libio_open_close_args_t args; |
---|
2058 | struct rtems_termios_tty *tty; |
---|
2059 | |
---|
2060 | device_node = IMFS_generic_get_context_by_iop (iop); |
---|
2061 | |
---|
2062 | memset (&args, 0, sizeof (args)); |
---|
2063 | args.iop = iop; |
---|
2064 | args.flags = iop->flags; |
---|
2065 | args.mode = mode; |
---|
2066 | |
---|
2067 | sc = rtems_termios_obtain (); |
---|
2068 | if (sc != RTEMS_SUCCESSFUL) { |
---|
2069 | rtems_set_errno_and_return_minus_one (ENXIO); |
---|
2070 | } |
---|
2071 | |
---|
2072 | tty = rtems_termios_open_tty (device_node->major, device_node->minor, &args, |
---|
2073 | device_node->tty, device_node, NULL); |
---|
2074 | if (tty == NULL) { |
---|
2075 | rtems_termios_release (); |
---|
2076 | rtems_set_errno_and_return_minus_one (ENOMEM); |
---|
2077 | } |
---|
2078 | |
---|
2079 | rtems_termios_release (); |
---|
2080 | return 0; |
---|
2081 | } |
---|
2082 | |
---|
2083 | static int |
---|
2084 | rtems_termios_imfs_close (rtems_libio_t *iop) |
---|
2085 | { |
---|
2086 | rtems_status_code sc; |
---|
2087 | rtems_libio_open_close_args_t args; |
---|
2088 | struct rtems_termios_tty *tty; |
---|
2089 | |
---|
2090 | memset (&args, 0, sizeof (args)); |
---|
2091 | args.iop = iop; |
---|
2092 | |
---|
2093 | tty = iop->data1; |
---|
2094 | |
---|
2095 | sc = rtems_termios_obtain (); |
---|
2096 | _Assert (sc == RTEMS_SUCCESSFUL); |
---|
2097 | (void) sc; |
---|
2098 | |
---|
2099 | rtems_termios_close_tty (tty, &args); |
---|
2100 | rtems_termios_release (); |
---|
2101 | return 0; |
---|
2102 | } |
---|
2103 | |
---|
2104 | static ssize_t |
---|
2105 | rtems_termios_imfs_read (rtems_libio_t *iop, void *buffer, size_t count) |
---|
2106 | { |
---|
2107 | struct rtems_termios_tty *tty; |
---|
2108 | rtems_status_code sc; |
---|
2109 | uint32_t bytes_moved; |
---|
2110 | |
---|
2111 | tty = iop->data1; |
---|
2112 | |
---|
2113 | sc = rtems_semaphore_obtain (tty->isem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
2114 | _Assert (sc == RTEMS_SUCCESSFUL); |
---|
2115 | |
---|
2116 | if (rtems_termios_linesw[tty->t_line].l_read != NULL) { |
---|
2117 | rtems_libio_rw_args_t args; |
---|
2118 | |
---|
2119 | memset (&args, 0, sizeof (args)); |
---|
2120 | args.iop = iop; |
---|
2121 | args.buffer = buffer; |
---|
2122 | args.count = count; |
---|
2123 | args.flags = iop->flags; |
---|
2124 | |
---|
2125 | sc = rtems_termios_linesw[tty->t_line].l_read (tty, &args); |
---|
2126 | tty->tty_rcvwakeup = false; |
---|
2127 | rtems_semaphore_release (tty->isem); |
---|
2128 | |
---|
2129 | if (sc != RTEMS_SUCCESSFUL) { |
---|
2130 | return rtems_status_code_to_errno (sc); |
---|
2131 | } |
---|
2132 | |
---|
2133 | return (ssize_t) args.bytes_moved; |
---|
2134 | } |
---|
2135 | |
---|
2136 | bytes_moved = rtems_termios_read_tty (tty, buffer, count); |
---|
2137 | rtems_semaphore_release (tty->isem); |
---|
2138 | return (ssize_t) bytes_moved; |
---|
2139 | } |
---|
2140 | |
---|
2141 | static ssize_t |
---|
2142 | rtems_termios_imfs_write (rtems_libio_t *iop, const void *buffer, size_t count) |
---|
2143 | { |
---|
2144 | struct rtems_termios_tty *tty; |
---|
2145 | rtems_status_code sc; |
---|
2146 | uint32_t bytes_moved; |
---|
2147 | |
---|
2148 | tty = iop->data1; |
---|
2149 | |
---|
2150 | sc = rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
2151 | _Assert (sc == RTEMS_SUCCESSFUL); |
---|
2152 | |
---|
2153 | if (rtems_termios_linesw[tty->t_line].l_write != NULL) { |
---|
2154 | rtems_libio_rw_args_t args; |
---|
2155 | |
---|
2156 | memset (&args, 0, sizeof (args)); |
---|
2157 | args.iop = iop; |
---|
2158 | args.buffer = RTEMS_DECONST (void *, buffer); |
---|
2159 | args.count = count; |
---|
2160 | args.flags = iop->flags; |
---|
2161 | |
---|
2162 | sc = rtems_termios_linesw[tty->t_line].l_write (tty, &args); |
---|
2163 | rtems_semaphore_release (tty->osem); |
---|
2164 | |
---|
2165 | if (sc != RTEMS_SUCCESSFUL) { |
---|
2166 | return rtems_status_code_to_errno (sc); |
---|
2167 | } |
---|
2168 | |
---|
2169 | return (ssize_t) args.bytes_moved; |
---|
2170 | } |
---|
2171 | |
---|
2172 | bytes_moved = rtems_termios_write_tty (iop, tty, buffer, count); |
---|
2173 | rtems_semaphore_release (tty->osem); |
---|
2174 | return (ssize_t) bytes_moved; |
---|
2175 | } |
---|
2176 | |
---|
2177 | static int |
---|
2178 | rtems_termios_imfs_ioctl (rtems_libio_t *iop, uint32_t request, void *buffer) |
---|
2179 | { |
---|
2180 | rtems_status_code sc; |
---|
2181 | rtems_libio_ioctl_args_t args; |
---|
2182 | |
---|
2183 | memset (&args, 0, sizeof (args)); |
---|
2184 | args.iop = iop; |
---|
2185 | args.command = request; |
---|
2186 | args.buffer = buffer; |
---|
2187 | |
---|
2188 | sc = rtems_termios_ioctl (&args); |
---|
2189 | if ( sc == RTEMS_SUCCESSFUL ) { |
---|
2190 | return args.ioctl_return; |
---|
2191 | } else { |
---|
2192 | return rtems_status_code_to_errno (sc); |
---|
2193 | } |
---|
2194 | } |
---|
2195 | |
---|
2196 | static const rtems_filesystem_file_handlers_r rtems_termios_imfs_handler = { |
---|
2197 | .open_h = rtems_termios_imfs_open, |
---|
2198 | .close_h = rtems_termios_imfs_close, |
---|
2199 | .read_h = rtems_termios_imfs_read, |
---|
2200 | .write_h = rtems_termios_imfs_write, |
---|
2201 | .ioctl_h = rtems_termios_imfs_ioctl, |
---|
2202 | .lseek_h = rtems_filesystem_default_lseek, |
---|
2203 | .fstat_h = IMFS_stat, |
---|
2204 | .ftruncate_h = rtems_filesystem_default_ftruncate, |
---|
2205 | .fsync_h = rtems_filesystem_default_fsync_or_fdatasync, |
---|
2206 | .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync, |
---|
2207 | .fcntl_h = rtems_filesystem_default_fcntl, |
---|
2208 | .kqfilter_h = rtems_termios_kqfilter, |
---|
2209 | .poll_h = rtems_termios_poll, |
---|
2210 | .readv_h = rtems_filesystem_default_readv, |
---|
2211 | .writev_h = rtems_filesystem_default_writev |
---|
2212 | }; |
---|
2213 | |
---|
2214 | static IMFS_jnode_t * |
---|
2215 | rtems_termios_imfs_node_initialize (IMFS_jnode_t *node, void *arg) |
---|
2216 | { |
---|
2217 | rtems_termios_device_node *device_node; |
---|
2218 | dev_t dev; |
---|
2219 | |
---|
2220 | node = IMFS_node_initialize_generic (node, arg); |
---|
2221 | device_node = IMFS_generic_get_context_by_node (node); |
---|
2222 | dev = IMFS_generic_get_device_identifier_by_node (node); |
---|
2223 | device_node->major = rtems_filesystem_dev_major_t (dev); |
---|
2224 | device_node->minor = rtems_filesystem_dev_minor_t (dev); |
---|
2225 | |
---|
2226 | return node; |
---|
2227 | } |
---|
2228 | |
---|
2229 | static void |
---|
2230 | rtems_termios_imfs_node_destroy (IMFS_jnode_t *node) |
---|
2231 | { |
---|
2232 | rtems_termios_device_node *device_node; |
---|
2233 | |
---|
2234 | device_node = IMFS_generic_get_context_by_node (node); |
---|
2235 | free (device_node); |
---|
2236 | IMFS_node_destroy_default (node); |
---|
2237 | } |
---|
2238 | |
---|
2239 | static const IMFS_node_control rtems_termios_imfs_node_control = |
---|
2240 | IMFS_GENERIC_INITIALIZER( |
---|
2241 | &rtems_termios_imfs_handler, |
---|
2242 | rtems_termios_imfs_node_initialize, |
---|
2243 | rtems_termios_imfs_node_destroy |
---|
2244 | ); |
---|