Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * dvb_frontend.c: DVB frontend tuning interface/thread |
| 3 | * |
| 4 | * |
| 5 | * Copyright (C) 1999-2001 Ralph Metzler |
| 6 | * Marcus Metzler |
| 7 | * Holger Waechtler |
| 8 | * for convergence integrated media GmbH |
| 9 | * |
| 10 | * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup) |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version 2 |
| 15 | * of the License, or (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with this program; if not, write to the Free Software |
| 24 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 25 | * Or, point your browser to http://www.gnu.org/copyleft/gpl.html |
| 26 | */ |
| 27 | |
| 28 | #include <linux/string.h> |
| 29 | #include <linux/kernel.h> |
| 30 | #include <linux/sched.h> |
| 31 | #include <linux/wait.h> |
| 32 | #include <linux/slab.h> |
| 33 | #include <linux/poll.h> |
| 34 | #include <linux/module.h> |
| 35 | #include <linux/moduleparam.h> |
| 36 | #include <linux/list.h> |
| 37 | #include <linux/suspend.h> |
Johannes Stezenbach | cc89c22 | 2005-06-23 22:02:39 -0700 | [diff] [blame] | 38 | #include <linux/jiffies.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <asm/processor.h> |
| 40 | #include <asm/semaphore.h> |
| 41 | |
| 42 | #include "dvb_frontend.h" |
| 43 | #include "dvbdev.h" |
| 44 | |
Andrew de Quincey | 4992775 | 2005-07-07 17:57:37 -0700 | [diff] [blame] | 45 | // #define DEBUG_LOCKLOSS 1 |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | static int dvb_frontend_debug; |
| 48 | static int dvb_shutdown_timeout = 5; |
| 49 | static int dvb_force_auto_inversion; |
| 50 | static int dvb_override_tune_delay; |
| 51 | static int dvb_powerdown_on_sleep = 1; |
| 52 | |
| 53 | module_param_named(frontend_debug, dvb_frontend_debug, int, 0644); |
Johannes Stezenbach | f4f009a | 2005-05-16 21:54:21 -0700 | [diff] [blame] | 54 | MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off)."); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | module_param(dvb_shutdown_timeout, int, 0444); |
| 56 | MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware"); |
| 57 | module_param(dvb_force_auto_inversion, int, 0444); |
| 58 | MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always"); |
| 59 | module_param(dvb_override_tune_delay, int, 0444); |
| 60 | MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt"); |
| 61 | module_param(dvb_powerdown_on_sleep, int, 0444); |
| 62 | MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB volatage off on sleep (default)"); |
| 63 | |
| 64 | #define dprintk if (dvb_frontend_debug) printk |
| 65 | |
| 66 | #define FESTATE_IDLE 1 |
| 67 | #define FESTATE_RETUNE 2 |
| 68 | #define FESTATE_TUNING_FAST 4 |
| 69 | #define FESTATE_TUNING_SLOW 8 |
| 70 | #define FESTATE_TUNED 16 |
| 71 | #define FESTATE_ZIGZAG_FAST 32 |
| 72 | #define FESTATE_ZIGZAG_SLOW 64 |
| 73 | #define FESTATE_DISEQC 128 |
| 74 | #define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC) |
| 75 | #define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST) |
| 76 | #define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW) |
| 77 | #define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW) |
| 78 | /* |
| 79 | * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling. |
| 80 | * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune. |
| 81 | * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress. |
| 82 | * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower. |
| 83 | * FESTATE_TUNED. The frontend has successfully locked on. |
| 84 | * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it. |
| 85 | * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower. |
| 86 | * FESTATE_DISEQC. A DISEQC command has just been issued. |
| 87 | * FESTATE_WAITFORLOCK. When we're waiting for a lock. |
| 88 | * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan. |
| 89 | * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan. |
| 90 | * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again. |
| 91 | */ |
| 92 | |
| 93 | static DECLARE_MUTEX(frontend_mutex); |
| 94 | |
| 95 | struct dvb_frontend_private { |
| 96 | |
| 97 | struct dvb_device *dvbdev; |
| 98 | struct dvb_frontend_parameters parameters; |
| 99 | struct dvb_fe_events events; |
| 100 | struct semaphore sem; |
| 101 | struct list_head list_head; |
| 102 | wait_queue_head_t wait_queue; |
| 103 | pid_t thread_pid; |
| 104 | unsigned long release_jiffies; |
| 105 | int state; |
| 106 | int bending; |
| 107 | int lnb_drift; |
| 108 | int inversion; |
| 109 | int auto_step; |
| 110 | int auto_sub_step; |
| 111 | int started_auto_step; |
| 112 | int min_delay; |
| 113 | int max_drift; |
| 114 | int step_size; |
| 115 | int exit; |
| 116 | int wakeup; |
| 117 | fe_status_t status; |
Andrew de Quincey | 4992775 | 2005-07-07 17:57:37 -0700 | [diff] [blame] | 118 | fe_sec_tone_mode_t tone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | }; |
| 120 | |
| 121 | |
| 122 | static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status) |
| 123 | { |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 124 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | struct dvb_fe_events *events = &fepriv->events; |
| 126 | struct dvb_frontend_event *e; |
| 127 | int wp; |
| 128 | |
| 129 | dprintk ("%s\n", __FUNCTION__); |
| 130 | |
| 131 | if (down_interruptible (&events->sem)) |
| 132 | return; |
| 133 | |
| 134 | wp = (events->eventw + 1) % MAX_EVENT; |
| 135 | |
| 136 | if (wp == events->eventr) { |
| 137 | events->overflow = 1; |
| 138 | events->eventr = (events->eventr + 1) % MAX_EVENT; |
| 139 | } |
| 140 | |
| 141 | e = &events->events[events->eventw]; |
| 142 | |
| 143 | memcpy (&e->parameters, &fepriv->parameters, |
| 144 | sizeof (struct dvb_frontend_parameters)); |
| 145 | |
| 146 | if (status & FE_HAS_LOCK) |
| 147 | if (fe->ops->get_frontend) |
| 148 | fe->ops->get_frontend(fe, &e->parameters); |
| 149 | |
| 150 | events->eventw = wp; |
| 151 | |
| 152 | up (&events->sem); |
| 153 | |
| 154 | e->status = status; |
| 155 | |
| 156 | wake_up_interruptible (&events->wait_queue); |
| 157 | } |
| 158 | |
| 159 | static int dvb_frontend_get_event(struct dvb_frontend *fe, |
| 160 | struct dvb_frontend_event *event, int flags) |
| 161 | { |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 162 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | struct dvb_fe_events *events = &fepriv->events; |
| 164 | |
| 165 | dprintk ("%s\n", __FUNCTION__); |
| 166 | |
| 167 | if (events->overflow) { |
| 168 | events->overflow = 0; |
| 169 | return -EOVERFLOW; |
| 170 | } |
| 171 | |
| 172 | if (events->eventw == events->eventr) { |
| 173 | int ret; |
| 174 | |
| 175 | if (flags & O_NONBLOCK) |
| 176 | return -EWOULDBLOCK; |
| 177 | |
| 178 | up(&fepriv->sem); |
| 179 | |
| 180 | ret = wait_event_interruptible (events->wait_queue, |
| 181 | events->eventw != events->eventr); |
| 182 | |
| 183 | if (down_interruptible (&fepriv->sem)) |
| 184 | return -ERESTARTSYS; |
| 185 | |
| 186 | if (ret < 0) |
| 187 | return ret; |
| 188 | } |
| 189 | |
| 190 | if (down_interruptible (&events->sem)) |
| 191 | return -ERESTARTSYS; |
| 192 | |
| 193 | memcpy (event, &events->events[events->eventr], |
| 194 | sizeof(struct dvb_frontend_event)); |
| 195 | |
| 196 | events->eventr = (events->eventr + 1) % MAX_EVENT; |
| 197 | |
| 198 | up (&events->sem); |
| 199 | |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | static void dvb_frontend_init(struct dvb_frontend *fe) |
| 204 | { |
| 205 | dprintk ("DVB: initialising frontend %i (%s)...\n", |
| 206 | fe->dvb->num, |
| 207 | fe->ops->info.name); |
| 208 | |
| 209 | if (fe->ops->init) |
| 210 | fe->ops->init(fe); |
| 211 | } |
| 212 | |
| 213 | static void update_delay(int *quality, int *delay, int min_delay, int locked) |
| 214 | { |
| 215 | int q2; |
| 216 | |
| 217 | dprintk ("%s\n", __FUNCTION__); |
| 218 | |
| 219 | if (locked) |
| 220 | (*quality) = (*quality * 220 + 36*256) / 256; |
| 221 | else |
| 222 | (*quality) = (*quality * 220 + 0) / 256; |
| 223 | |
| 224 | q2 = *quality - 128; |
| 225 | q2 *= q2; |
| 226 | |
| 227 | *delay = min_delay + q2 * HZ / (128*128); |
| 228 | } |
| 229 | |
| 230 | /** |
| 231 | * Performs automatic twiddling of frontend parameters. |
| 232 | * |
| 233 | * @param fe The frontend concerned. |
| 234 | * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT |
| 235 | * @returns Number of complete iterations that have been performed. |
| 236 | */ |
| 237 | static int dvb_frontend_autotune(struct dvb_frontend *fe, int check_wrapped) |
| 238 | { |
| 239 | int autoinversion; |
| 240 | int ready = 0; |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 241 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | int original_inversion = fepriv->parameters.inversion; |
| 243 | u32 original_frequency = fepriv->parameters.frequency; |
| 244 | |
| 245 | /* are we using autoinversion? */ |
| 246 | autoinversion = ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) && |
| 247 | (fepriv->parameters.inversion == INVERSION_AUTO)); |
| 248 | |
| 249 | /* setup parameters correctly */ |
| 250 | while(!ready) { |
| 251 | /* calculate the lnb_drift */ |
| 252 | fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size; |
| 253 | |
| 254 | /* wrap the auto_step if we've exceeded the maximum drift */ |
| 255 | if (fepriv->lnb_drift > fepriv->max_drift) { |
| 256 | fepriv->auto_step = 0; |
| 257 | fepriv->auto_sub_step = 0; |
| 258 | fepriv->lnb_drift = 0; |
| 259 | } |
| 260 | |
| 261 | /* perform inversion and +/- zigzag */ |
| 262 | switch(fepriv->auto_sub_step) { |
| 263 | case 0: |
| 264 | /* try with the current inversion and current drift setting */ |
| 265 | ready = 1; |
| 266 | break; |
| 267 | |
| 268 | case 1: |
| 269 | if (!autoinversion) break; |
| 270 | |
| 271 | fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF; |
| 272 | ready = 1; |
| 273 | break; |
| 274 | |
| 275 | case 2: |
| 276 | if (fepriv->lnb_drift == 0) break; |
| 277 | |
| 278 | fepriv->lnb_drift = -fepriv->lnb_drift; |
| 279 | ready = 1; |
| 280 | break; |
| 281 | |
| 282 | case 3: |
| 283 | if (fepriv->lnb_drift == 0) break; |
| 284 | if (!autoinversion) break; |
| 285 | |
| 286 | fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF; |
| 287 | fepriv->lnb_drift = -fepriv->lnb_drift; |
| 288 | ready = 1; |
| 289 | break; |
| 290 | |
| 291 | default: |
| 292 | fepriv->auto_step++; |
| 293 | fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */ |
| 294 | break; |
| 295 | } |
| 296 | |
| 297 | if (!ready) fepriv->auto_sub_step++; |
| 298 | } |
| 299 | |
| 300 | /* if this attempt would hit where we started, indicate a complete |
| 301 | * iteration has occurred */ |
| 302 | if ((fepriv->auto_step == fepriv->started_auto_step) && |
| 303 | (fepriv->auto_sub_step == 0) && check_wrapped) { |
| 304 | return 1; |
| 305 | } |
| 306 | |
| 307 | dprintk("%s: drift:%i inversion:%i auto_step:%i " |
| 308 | "auto_sub_step:%i started_auto_step:%i\n", |
| 309 | __FUNCTION__, fepriv->lnb_drift, fepriv->inversion, |
| 310 | fepriv->auto_step, fepriv->auto_sub_step, fepriv->started_auto_step); |
| 311 | |
| 312 | /* set the frontend itself */ |
| 313 | fepriv->parameters.frequency += fepriv->lnb_drift; |
| 314 | if (autoinversion) |
| 315 | fepriv->parameters.inversion = fepriv->inversion; |
| 316 | if (fe->ops->set_frontend) |
| 317 | fe->ops->set_frontend(fe, &fepriv->parameters); |
| 318 | |
| 319 | fepriv->parameters.frequency = original_frequency; |
| 320 | fepriv->parameters.inversion = original_inversion; |
| 321 | |
| 322 | fepriv->auto_sub_step++; |
| 323 | return 0; |
| 324 | } |
| 325 | |
| 326 | static int dvb_frontend_is_exiting(struct dvb_frontend *fe) |
| 327 | { |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 328 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
| 330 | if (fepriv->exit) |
| 331 | return 1; |
| 332 | |
| 333 | if (fepriv->dvbdev->writers == 1) |
Johannes Stezenbach | cc89c22 | 2005-06-23 22:02:39 -0700 | [diff] [blame] | 334 | if (time_after(jiffies, fepriv->release_jiffies + |
| 335 | dvb_shutdown_timeout * HZ)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | return 1; |
| 337 | |
| 338 | return 0; |
| 339 | } |
| 340 | |
| 341 | static int dvb_frontend_should_wakeup(struct dvb_frontend *fe) |
| 342 | { |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 343 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
| 345 | if (fepriv->wakeup) { |
| 346 | fepriv->wakeup = 0; |
| 347 | return 1; |
| 348 | } |
| 349 | return dvb_frontend_is_exiting(fe); |
| 350 | } |
| 351 | |
| 352 | static void dvb_frontend_wakeup(struct dvb_frontend *fe) |
| 353 | { |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 354 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | |
| 356 | fepriv->wakeup = 1; |
| 357 | wake_up_interruptible(&fepriv->wait_queue); |
| 358 | } |
| 359 | |
| 360 | /* |
| 361 | * FIXME: use linux/kthread.h |
| 362 | */ |
| 363 | static int dvb_frontend_thread(void *data) |
| 364 | { |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 365 | struct dvb_frontend *fe = data; |
| 366 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | unsigned long timeout; |
| 368 | char name [15]; |
| 369 | int quality = 0, delay = 3*HZ; |
| 370 | fe_status_t s; |
| 371 | int check_wrapped = 0; |
| 372 | |
| 373 | dprintk("%s\n", __FUNCTION__); |
| 374 | |
| 375 | snprintf (name, sizeof(name), "kdvb-fe-%i", fe->dvb->num); |
| 376 | |
| 377 | lock_kernel(); |
| 378 | daemonize(name); |
| 379 | sigfillset(¤t->blocked); |
| 380 | unlock_kernel(); |
| 381 | |
| 382 | fepriv->status = 0; |
| 383 | dvb_frontend_init(fe); |
| 384 | fepriv->wakeup = 0; |
| 385 | |
| 386 | while (1) { |
| 387 | up(&fepriv->sem); /* is locked when we enter the thread... */ |
| 388 | |
| 389 | timeout = wait_event_interruptible_timeout(fepriv->wait_queue, |
| 390 | dvb_frontend_should_wakeup(fe), |
| 391 | delay); |
| 392 | if (0 != dvb_frontend_is_exiting(fe)) { |
| 393 | /* got signal or quitting */ |
| 394 | break; |
| 395 | } |
| 396 | |
Christoph Lameter | 3e1d1d2 | 2005-06-24 23:13:50 -0700 | [diff] [blame] | 397 | try_to_freeze(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
| 399 | if (down_interruptible(&fepriv->sem)) |
| 400 | break; |
| 401 | |
| 402 | /* if we've got no parameters, just keep idling */ |
| 403 | if (fepriv->state & FESTATE_IDLE) { |
| 404 | delay = 3*HZ; |
| 405 | quality = 0; |
| 406 | continue; |
| 407 | } |
| 408 | |
| 409 | /* get the frontend status */ |
| 410 | if (fepriv->state & FESTATE_RETUNE) { |
| 411 | s = 0; |
| 412 | } else { |
| 413 | if (fe->ops->read_status) |
| 414 | fe->ops->read_status(fe, &s); |
| 415 | if (s != fepriv->status) { |
| 416 | dvb_frontend_add_event(fe, s); |
| 417 | fepriv->status = s; |
| 418 | } |
| 419 | } |
| 420 | /* if we're not tuned, and we have a lock, move to the TUNED state */ |
| 421 | if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) { |
| 422 | update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK); |
| 423 | fepriv->state = FESTATE_TUNED; |
| 424 | |
| 425 | /* if we're tuned, then we have determined the correct inversion */ |
| 426 | if ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) && |
| 427 | (fepriv->parameters.inversion == INVERSION_AUTO)) { |
| 428 | fepriv->parameters.inversion = fepriv->inversion; |
| 429 | } |
| 430 | continue; |
| 431 | } |
| 432 | |
| 433 | /* if we are tuned already, check we're still locked */ |
| 434 | if (fepriv->state & FESTATE_TUNED) { |
| 435 | update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK); |
| 436 | |
| 437 | /* we're tuned, and the lock is still good... */ |
| 438 | if (s & FE_HAS_LOCK) |
| 439 | continue; |
Andrew de Quincey | 4992775 | 2005-07-07 17:57:37 -0700 | [diff] [blame] | 440 | else { /* if we _WERE_ tuned, but now don't have a lock */ |
| 441 | #ifdef DEBUG_LOCKLOSS |
| 442 | /* first of all try setting the tone again if it was on - this |
| 443 | * sometimes works around problems with noisy power supplies */ |
| 444 | if (fe->ops->set_tone && (fepriv->tone == SEC_TONE_ON)) { |
| 445 | fe->ops->set_tone(fe, fepriv->tone); |
| 446 | mdelay(100); |
| 447 | s = 0; |
| 448 | fe->ops->read_status(fe, &s); |
| 449 | if (s & FE_HAS_LOCK) { |
| 450 | printk("DVB%i: Lock was lost, but regained by setting " |
| 451 | "the tone. This may indicate your power supply " |
| 452 | "is noisy/slightly incompatable with this DVB-S " |
| 453 | "adapter\n", fe->dvb->num); |
| 454 | fepriv->state = FESTATE_TUNED; |
| 455 | continue; |
| 456 | } |
| 457 | } |
| 458 | #endif |
| 459 | /* some other reason for losing the lock - start zigzagging */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | fepriv->state = FESTATE_ZIGZAG_FAST; |
| 461 | fepriv->started_auto_step = fepriv->auto_step; |
| 462 | check_wrapped = 0; |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | /* don't actually do anything if we're in the LOSTLOCK state, |
| 467 | * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */ |
| 468 | if ((fepriv->state & FESTATE_LOSTLOCK) && |
| 469 | (fe->ops->info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) { |
| 470 | update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK); |
| 471 | continue; |
| 472 | } |
| 473 | |
| 474 | /* don't do anything if we're in the DISEQC state, since this |
| 475 | * might be someone with a motorized dish controlled by DISEQC. |
| 476 | * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */ |
| 477 | if (fepriv->state & FESTATE_DISEQC) { |
| 478 | update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK); |
| 479 | continue; |
| 480 | } |
| 481 | |
| 482 | /* if we're in the RETUNE state, set everything up for a brand |
| 483 | * new scan, keeping the current inversion setting, as the next |
| 484 | * tune is _very_ likely to require the same */ |
| 485 | if (fepriv->state & FESTATE_RETUNE) { |
| 486 | fepriv->lnb_drift = 0; |
| 487 | fepriv->auto_step = 0; |
| 488 | fepriv->auto_sub_step = 0; |
| 489 | fepriv->started_auto_step = 0; |
| 490 | check_wrapped = 0; |
| 491 | } |
| 492 | |
| 493 | /* fast zigzag. */ |
| 494 | if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) { |
| 495 | delay = fepriv->min_delay; |
| 496 | |
| 497 | /* peform a tune */ |
| 498 | if (dvb_frontend_autotune(fe, check_wrapped)) { |
| 499 | /* OK, if we've run out of trials at the fast speed. |
| 500 | * Drop back to slow for the _next_ attempt */ |
| 501 | fepriv->state = FESTATE_SEARCHING_SLOW; |
| 502 | fepriv->started_auto_step = fepriv->auto_step; |
| 503 | continue; |
| 504 | } |
| 505 | check_wrapped = 1; |
| 506 | |
| 507 | /* if we've just retuned, enter the ZIGZAG_FAST state. |
| 508 | * This ensures we cannot return from an |
| 509 | * FE_SET_FRONTEND ioctl before the first frontend tune |
| 510 | * occurs */ |
| 511 | if (fepriv->state & FESTATE_RETUNE) { |
| 512 | fepriv->state = FESTATE_TUNING_FAST; |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | /* slow zigzag */ |
| 517 | if (fepriv->state & FESTATE_SEARCHING_SLOW) { |
| 518 | update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK); |
| 519 | |
| 520 | /* Note: don't bother checking for wrapping; we stay in this |
| 521 | * state until we get a lock */ |
| 522 | dvb_frontend_autotune(fe, 0); |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | if (dvb_shutdown_timeout) { |
| 527 | if (dvb_powerdown_on_sleep) |
| 528 | if (fe->ops->set_voltage) |
| 529 | fe->ops->set_voltage(fe, SEC_VOLTAGE_OFF); |
| 530 | if (fe->ops->sleep) |
| 531 | fe->ops->sleep(fe); |
| 532 | } |
| 533 | |
| 534 | fepriv->thread_pid = 0; |
| 535 | mb(); |
| 536 | |
| 537 | dvb_frontend_wakeup(fe); |
| 538 | return 0; |
| 539 | } |
| 540 | |
| 541 | static void dvb_frontend_stop(struct dvb_frontend *fe) |
| 542 | { |
| 543 | unsigned long ret; |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 544 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
| 546 | dprintk ("%s\n", __FUNCTION__); |
| 547 | |
| 548 | fepriv->exit = 1; |
| 549 | mb(); |
| 550 | |
| 551 | if (!fepriv->thread_pid) |
| 552 | return; |
| 553 | |
| 554 | /* check if the thread is really alive */ |
| 555 | if (kill_proc(fepriv->thread_pid, 0, 1) == -ESRCH) { |
| 556 | printk("dvb_frontend_stop: thread PID %d already died\n", |
| 557 | fepriv->thread_pid); |
| 558 | /* make sure the mutex was not held by the thread */ |
| 559 | init_MUTEX (&fepriv->sem); |
| 560 | return; |
| 561 | } |
| 562 | |
| 563 | /* wake up the frontend thread, so it notices that fe->exit == 1 */ |
| 564 | dvb_frontend_wakeup(fe); |
| 565 | |
| 566 | /* wait until the frontend thread has exited */ |
| 567 | ret = wait_event_interruptible(fepriv->wait_queue,0 == fepriv->thread_pid); |
| 568 | if (-ERESTARTSYS != ret) { |
| 569 | fepriv->state = FESTATE_IDLE; |
| 570 | return; |
| 571 | } |
| 572 | fepriv->state = FESTATE_IDLE; |
| 573 | |
| 574 | /* paranoia check in case a signal arrived */ |
| 575 | if (fepriv->thread_pid) |
| 576 | printk("dvb_frontend_stop: warning: thread PID %d won't exit\n", |
| 577 | fepriv->thread_pid); |
| 578 | } |
| 579 | |
| 580 | static int dvb_frontend_start(struct dvb_frontend *fe) |
| 581 | { |
| 582 | int ret; |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 583 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | |
| 585 | dprintk ("%s\n", __FUNCTION__); |
| 586 | |
| 587 | if (fepriv->thread_pid) { |
| 588 | if (!fepriv->exit) |
| 589 | return 0; |
| 590 | else |
| 591 | dvb_frontend_stop (fe); |
| 592 | } |
| 593 | |
| 594 | if (signal_pending(current)) |
| 595 | return -EINTR; |
| 596 | if (down_interruptible (&fepriv->sem)) |
| 597 | return -EINTR; |
| 598 | |
| 599 | fepriv->state = FESTATE_IDLE; |
| 600 | fepriv->exit = 0; |
| 601 | fepriv->thread_pid = 0; |
| 602 | mb(); |
| 603 | |
| 604 | ret = kernel_thread (dvb_frontend_thread, fe, 0); |
| 605 | |
| 606 | if (ret < 0) { |
| 607 | printk("dvb_frontend_start: failed to start kernel_thread (%d)\n", ret); |
| 608 | up(&fepriv->sem); |
| 609 | return ret; |
| 610 | } |
| 611 | fepriv->thread_pid = ret; |
| 612 | |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | static int dvb_frontend_ioctl(struct inode *inode, struct file *file, |
| 617 | unsigned int cmd, void *parg) |
| 618 | { |
| 619 | struct dvb_device *dvbdev = file->private_data; |
| 620 | struct dvb_frontend *fe = dvbdev->priv; |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 621 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | int err = -EOPNOTSUPP; |
| 623 | |
| 624 | dprintk ("%s\n", __FUNCTION__); |
| 625 | |
| 626 | if (!fe || fepriv->exit) |
| 627 | return -ENODEV; |
| 628 | |
| 629 | if ((file->f_flags & O_ACCMODE) == O_RDONLY && |
| 630 | (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT || |
| 631 | cmd == FE_DISEQC_RECV_SLAVE_REPLY)) |
| 632 | return -EPERM; |
| 633 | |
| 634 | if (down_interruptible (&fepriv->sem)) |
| 635 | return -ERESTARTSYS; |
| 636 | |
| 637 | switch (cmd) { |
| 638 | case FE_GET_INFO: { |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 639 | struct dvb_frontend_info* info = parg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | memcpy(info, &fe->ops->info, sizeof(struct dvb_frontend_info)); |
| 641 | |
| 642 | /* Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't |
| 643 | * do it, it is done for it. */ |
| 644 | info->caps |= FE_CAN_INVERSION_AUTO; |
| 645 | err = 0; |
| 646 | break; |
| 647 | } |
| 648 | |
Peter Beutner | 6757ccc | 2005-07-07 17:57:36 -0700 | [diff] [blame] | 649 | case FE_READ_STATUS: { |
| 650 | fe_status_t* status = parg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | |
Peter Beutner | 6757ccc | 2005-07-07 17:57:36 -0700 | [diff] [blame] | 652 | /* if retune was requested but hasn't occured yet, prevent |
| 653 | * that user get signal state from previous tuning */ |
| 654 | if(fepriv->state == FESTATE_RETUNE) { |
| 655 | err=0; |
| 656 | *status = 0; |
| 657 | break; |
| 658 | } |
| 659 | |
| 660 | if (fe->ops->read_status) |
| 661 | err = fe->ops->read_status(fe, status); |
| 662 | break; |
| 663 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | case FE_READ_BER: |
| 665 | if (fe->ops->read_ber) |
| 666 | err = fe->ops->read_ber(fe, (__u32*) parg); |
| 667 | break; |
| 668 | |
| 669 | case FE_READ_SIGNAL_STRENGTH: |
| 670 | if (fe->ops->read_signal_strength) |
| 671 | err = fe->ops->read_signal_strength(fe, (__u16*) parg); |
| 672 | break; |
| 673 | |
| 674 | case FE_READ_SNR: |
| 675 | if (fe->ops->read_snr) |
| 676 | err = fe->ops->read_snr(fe, (__u16*) parg); |
| 677 | break; |
| 678 | |
| 679 | case FE_READ_UNCORRECTED_BLOCKS: |
| 680 | if (fe->ops->read_ucblocks) |
| 681 | err = fe->ops->read_ucblocks(fe, (__u32*) parg); |
| 682 | break; |
| 683 | |
| 684 | |
| 685 | case FE_DISEQC_RESET_OVERLOAD: |
| 686 | if (fe->ops->diseqc_reset_overload) { |
| 687 | err = fe->ops->diseqc_reset_overload(fe); |
| 688 | fepriv->state = FESTATE_DISEQC; |
| 689 | fepriv->status = 0; |
| 690 | } |
| 691 | break; |
| 692 | |
| 693 | case FE_DISEQC_SEND_MASTER_CMD: |
| 694 | if (fe->ops->diseqc_send_master_cmd) { |
| 695 | err = fe->ops->diseqc_send_master_cmd(fe, (struct dvb_diseqc_master_cmd*) parg); |
| 696 | fepriv->state = FESTATE_DISEQC; |
| 697 | fepriv->status = 0; |
| 698 | } |
| 699 | break; |
| 700 | |
| 701 | case FE_DISEQC_SEND_BURST: |
| 702 | if (fe->ops->diseqc_send_burst) { |
| 703 | err = fe->ops->diseqc_send_burst(fe, (fe_sec_mini_cmd_t) parg); |
| 704 | fepriv->state = FESTATE_DISEQC; |
| 705 | fepriv->status = 0; |
| 706 | } |
| 707 | break; |
| 708 | |
| 709 | case FE_SET_TONE: |
| 710 | if (fe->ops->set_tone) { |
| 711 | err = fe->ops->set_tone(fe, (fe_sec_tone_mode_t) parg); |
| 712 | fepriv->state = FESTATE_DISEQC; |
| 713 | fepriv->status = 0; |
Andrew de Quincey | 4992775 | 2005-07-07 17:57:37 -0700 | [diff] [blame] | 714 | fepriv->tone = (fe_sec_tone_mode_t) parg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | } |
| 716 | break; |
| 717 | |
| 718 | case FE_SET_VOLTAGE: |
| 719 | if (fe->ops->set_voltage) { |
| 720 | err = fe->ops->set_voltage(fe, (fe_sec_voltage_t) parg); |
| 721 | fepriv->state = FESTATE_DISEQC; |
| 722 | fepriv->status = 0; |
| 723 | } |
| 724 | break; |
| 725 | |
| 726 | case FE_DISHNETWORK_SEND_LEGACY_CMD: |
| 727 | if (fe->ops->dishnetwork_send_legacy_command) { |
| 728 | err = fe->ops->dishnetwork_send_legacy_command(fe, (unsigned int) parg); |
| 729 | fepriv->state = FESTATE_DISEQC; |
| 730 | fepriv->status = 0; |
| 731 | } |
| 732 | break; |
| 733 | |
| 734 | case FE_DISEQC_RECV_SLAVE_REPLY: |
| 735 | if (fe->ops->diseqc_recv_slave_reply) |
| 736 | err = fe->ops->diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg); |
| 737 | break; |
| 738 | |
| 739 | case FE_ENABLE_HIGH_LNB_VOLTAGE: |
| 740 | if (fe->ops->enable_high_lnb_voltage) |
| 741 | err = fe->ops->enable_high_lnb_voltage(fe, (int) parg); |
| 742 | break; |
| 743 | |
| 744 | case FE_SET_FRONTEND: { |
| 745 | struct dvb_frontend_tune_settings fetunesettings; |
| 746 | |
| 747 | memcpy (&fepriv->parameters, parg, |
| 748 | sizeof (struct dvb_frontend_parameters)); |
| 749 | |
| 750 | memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings)); |
| 751 | memcpy(&fetunesettings.parameters, parg, |
| 752 | sizeof (struct dvb_frontend_parameters)); |
| 753 | |
| 754 | /* force auto frequency inversion if requested */ |
| 755 | if (dvb_force_auto_inversion) { |
| 756 | fepriv->parameters.inversion = INVERSION_AUTO; |
| 757 | fetunesettings.parameters.inversion = INVERSION_AUTO; |
| 758 | } |
| 759 | if (fe->ops->info.type == FE_OFDM) { |
| 760 | /* without hierachical coding code_rate_LP is irrelevant, |
| 761 | * so we tolerate the otherwise invalid FEC_NONE setting */ |
| 762 | if (fepriv->parameters.u.ofdm.hierarchy_information == HIERARCHY_NONE && |
| 763 | fepriv->parameters.u.ofdm.code_rate_LP == FEC_NONE) |
| 764 | fepriv->parameters.u.ofdm.code_rate_LP = FEC_AUTO; |
| 765 | } |
| 766 | |
| 767 | /* get frontend-specific tuning settings */ |
| 768 | if (fe->ops->get_tune_settings && (fe->ops->get_tune_settings(fe, &fetunesettings) == 0)) { |
| 769 | fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000; |
| 770 | fepriv->max_drift = fetunesettings.max_drift; |
| 771 | fepriv->step_size = fetunesettings.step_size; |
| 772 | } else { |
| 773 | /* default values */ |
| 774 | switch(fe->ops->info.type) { |
| 775 | case FE_QPSK: |
| 776 | fepriv->min_delay = HZ/20; |
| 777 | fepriv->step_size = fepriv->parameters.u.qpsk.symbol_rate / 16000; |
| 778 | fepriv->max_drift = fepriv->parameters.u.qpsk.symbol_rate / 2000; |
| 779 | break; |
| 780 | |
| 781 | case FE_QAM: |
| 782 | fepriv->min_delay = HZ/20; |
| 783 | fepriv->step_size = 0; /* no zigzag */ |
| 784 | fepriv->max_drift = 0; |
| 785 | break; |
| 786 | |
| 787 | case FE_OFDM: |
| 788 | fepriv->min_delay = HZ/20; |
| 789 | fepriv->step_size = fe->ops->info.frequency_stepsize * 2; |
| 790 | fepriv->max_drift = (fe->ops->info.frequency_stepsize * 2) + 1; |
| 791 | break; |
| 792 | case FE_ATSC: |
| 793 | printk("dvb-core: FE_ATSC not handled yet.\n"); |
| 794 | break; |
| 795 | } |
| 796 | } |
| 797 | if (dvb_override_tune_delay > 0) |
| 798 | fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000; |
| 799 | |
| 800 | fepriv->state = FESTATE_RETUNE; |
| 801 | dvb_frontend_wakeup(fe); |
| 802 | dvb_frontend_add_event(fe, 0); |
| 803 | fepriv->status = 0; |
| 804 | err = 0; |
| 805 | break; |
| 806 | } |
| 807 | |
| 808 | case FE_GET_EVENT: |
| 809 | err = dvb_frontend_get_event (fe, parg, file->f_flags); |
| 810 | break; |
| 811 | |
| 812 | case FE_GET_FRONTEND: |
| 813 | if (fe->ops->get_frontend) { |
| 814 | memcpy (parg, &fepriv->parameters, sizeof (struct dvb_frontend_parameters)); |
| 815 | err = fe->ops->get_frontend(fe, (struct dvb_frontend_parameters*) parg); |
| 816 | } |
| 817 | break; |
| 818 | }; |
| 819 | |
| 820 | up (&fepriv->sem); |
| 821 | return err; |
| 822 | } |
| 823 | |
| 824 | static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait) |
| 825 | { |
| 826 | struct dvb_device *dvbdev = file->private_data; |
| 827 | struct dvb_frontend *fe = dvbdev->priv; |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 828 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | |
| 830 | dprintk ("%s\n", __FUNCTION__); |
| 831 | |
| 832 | poll_wait (file, &fepriv->events.wait_queue, wait); |
| 833 | |
| 834 | if (fepriv->events.eventw != fepriv->events.eventr) |
| 835 | return (POLLIN | POLLRDNORM | POLLPRI); |
| 836 | |
| 837 | return 0; |
| 838 | } |
| 839 | |
| 840 | static int dvb_frontend_open(struct inode *inode, struct file *file) |
| 841 | { |
| 842 | struct dvb_device *dvbdev = file->private_data; |
| 843 | struct dvb_frontend *fe = dvbdev->priv; |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 844 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | int ret; |
| 846 | |
| 847 | dprintk ("%s\n", __FUNCTION__); |
| 848 | |
| 849 | if ((ret = dvb_generic_open (inode, file)) < 0) |
| 850 | return ret; |
| 851 | |
| 852 | if ((file->f_flags & O_ACCMODE) != O_RDONLY) { |
| 853 | ret = dvb_frontend_start (fe); |
| 854 | if (ret) |
| 855 | dvb_generic_release (inode, file); |
| 856 | |
| 857 | /* empty event queue */ |
| 858 | fepriv->events.eventr = fepriv->events.eventw = 0; |
| 859 | } |
| 860 | |
| 861 | return ret; |
| 862 | } |
| 863 | |
| 864 | static int dvb_frontend_release(struct inode *inode, struct file *file) |
| 865 | { |
| 866 | struct dvb_device *dvbdev = file->private_data; |
| 867 | struct dvb_frontend *fe = dvbdev->priv; |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 868 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
| 870 | dprintk ("%s\n", __FUNCTION__); |
| 871 | |
| 872 | if ((file->f_flags & O_ACCMODE) != O_RDONLY) |
| 873 | fepriv->release_jiffies = jiffies; |
| 874 | |
| 875 | return dvb_generic_release (inode, file); |
| 876 | } |
| 877 | |
| 878 | static struct file_operations dvb_frontend_fops = { |
| 879 | .owner = THIS_MODULE, |
| 880 | .ioctl = dvb_generic_ioctl, |
| 881 | .poll = dvb_frontend_poll, |
| 882 | .open = dvb_frontend_open, |
| 883 | .release = dvb_frontend_release |
| 884 | }; |
| 885 | |
| 886 | int dvb_register_frontend(struct dvb_adapter* dvb, |
| 887 | struct dvb_frontend* fe) |
| 888 | { |
| 889 | struct dvb_frontend_private *fepriv; |
| 890 | static const struct dvb_device dvbdev_template = { |
| 891 | .users = ~0, |
| 892 | .writers = 1, |
| 893 | .readers = (~0)-1, |
| 894 | .fops = &dvb_frontend_fops, |
| 895 | .kernel_ioctl = dvb_frontend_ioctl |
| 896 | }; |
| 897 | |
| 898 | dprintk ("%s\n", __FUNCTION__); |
| 899 | |
| 900 | if (down_interruptible (&frontend_mutex)) |
| 901 | return -ERESTARTSYS; |
| 902 | |
| 903 | fe->frontend_priv = kmalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL); |
| 904 | if (fe->frontend_priv == NULL) { |
| 905 | up(&frontend_mutex); |
| 906 | return -ENOMEM; |
| 907 | } |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 908 | fepriv = fe->frontend_priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | memset(fe->frontend_priv, 0, sizeof(struct dvb_frontend_private)); |
| 910 | |
| 911 | init_MUTEX (&fepriv->sem); |
| 912 | init_waitqueue_head (&fepriv->wait_queue); |
| 913 | init_waitqueue_head (&fepriv->events.wait_queue); |
| 914 | init_MUTEX (&fepriv->events.sem); |
| 915 | fe->dvb = dvb; |
| 916 | fepriv->inversion = INVERSION_OFF; |
Andrew de Quincey | 4992775 | 2005-07-07 17:57:37 -0700 | [diff] [blame] | 917 | fepriv->tone = SEC_TONE_OFF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | |
| 919 | printk ("DVB: registering frontend %i (%s)...\n", |
| 920 | fe->dvb->num, |
| 921 | fe->ops->info.name); |
| 922 | |
| 923 | dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template, |
| 924 | fe, DVB_DEVICE_FRONTEND); |
| 925 | |
| 926 | up (&frontend_mutex); |
| 927 | return 0; |
| 928 | } |
| 929 | EXPORT_SYMBOL(dvb_register_frontend); |
| 930 | |
| 931 | int dvb_unregister_frontend(struct dvb_frontend* fe) |
| 932 | { |
Johannes Stezenbach | 0c53c70 | 2005-05-16 21:54:24 -0700 | [diff] [blame] | 933 | struct dvb_frontend_private *fepriv = fe->frontend_priv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | dprintk ("%s\n", __FUNCTION__); |
| 935 | |
| 936 | down (&frontend_mutex); |
| 937 | dvb_unregister_device (fepriv->dvbdev); |
| 938 | dvb_frontend_stop (fe); |
| 939 | if (fe->ops->release) |
| 940 | fe->ops->release(fe); |
| 941 | else |
| 942 | printk("dvb_frontend: Demodulator (%s) does not have a release callback!\n", fe->ops->info.name); |
| 943 | /* fe is invalid now */ |
| 944 | kfree(fepriv); |
| 945 | up (&frontend_mutex); |
| 946 | return 0; |
| 947 | } |
| 948 | EXPORT_SYMBOL(dvb_unregister_frontend); |