diff options
Diffstat (limited to 'drivers/media/dvb-core/dvb_frontend.c')
| -rw-r--r-- | drivers/media/dvb-core/dvb_frontend.c | 2617 |
1 files changed, 2617 insertions, 0 deletions
diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c new file mode 100644 index 000000000000..8f58f241c10d --- /dev/null +++ b/drivers/media/dvb-core/dvb_frontend.c @@ -0,0 +1,2617 @@ +/* + * dvb_frontend.c: DVB frontend tuning interface/thread + * + * + * Copyright (C) 1999-2001 Ralph Metzler + * Marcus Metzler + * Holger Waechtler + * for convergence integrated media GmbH + * + * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * Or, point your browser to http://www.gnu.org/copyleft/gpl.html + */ + +/* Enables DVBv3 compatibility bits at the headers */ +#define __DVB_CORE__ + +#include <linux/string.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/wait.h> +#include <linux/slab.h> +#include <linux/poll.h> +#include <linux/semaphore.h> +#include <linux/module.h> +#include <linux/list.h> +#include <linux/freezer.h> +#include <linux/jiffies.h> +#include <linux/kthread.h> +#include <asm/processor.h> + +#include "dvb_frontend.h" +#include "dvbdev.h" +#include <linux/dvb/version.h> + +static int dvb_frontend_debug; +static int dvb_shutdown_timeout; +static int dvb_force_auto_inversion; +static int dvb_override_tune_delay; +static int dvb_powerdown_on_sleep = 1; +static int dvb_mfe_wait_time = 5; + +module_param_named(frontend_debug, dvb_frontend_debug, int, 0644); +MODULE_PARM_DESC(frontend_debug, "Turn on/off frontend core debugging (default:off)."); +module_param(dvb_shutdown_timeout, int, 0644); +MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware"); +module_param(dvb_force_auto_inversion, int, 0644); +MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always"); +module_param(dvb_override_tune_delay, int, 0644); +MODULE_PARM_DESC(dvb_override_tune_delay, "0: normal (default), >0 => delay in milliseconds to wait for lock after a tune attempt"); +module_param(dvb_powerdown_on_sleep, int, 0644); +MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB voltage off on sleep (default)"); +module_param(dvb_mfe_wait_time, int, 0644); +MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open() for multi-frontend to become available (default:5 seconds)"); + +#define FESTATE_IDLE 1 +#define FESTATE_RETUNE 2 +#define FESTATE_TUNING_FAST 4 +#define FESTATE_TUNING_SLOW 8 +#define FESTATE_TUNED 16 +#define FESTATE_ZIGZAG_FAST 32 +#define FESTATE_ZIGZAG_SLOW 64 +#define FESTATE_DISEQC 128 +#define FESTATE_ERROR 256 +#define FESTATE_WAITFORLOCK (FESTATE_TUNING_FAST | FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW | FESTATE_DISEQC) +#define FESTATE_SEARCHING_FAST (FESTATE_TUNING_FAST | FESTATE_ZIGZAG_FAST) +#define FESTATE_SEARCHING_SLOW (FESTATE_TUNING_SLOW | FESTATE_ZIGZAG_SLOW) +#define FESTATE_LOSTLOCK (FESTATE_ZIGZAG_FAST | FESTATE_ZIGZAG_SLOW) + +#define FE_ALGO_HW 1 +/* + * FESTATE_IDLE. No tuning parameters have been supplied and the loop is idling. + * FESTATE_RETUNE. Parameters have been supplied, but we have not yet performed the first tune. + * FESTATE_TUNING_FAST. Tuning parameters have been supplied and fast zigzag scan is in progress. + * FESTATE_TUNING_SLOW. Tuning parameters have been supplied. Fast zigzag failed, so we're trying again, but slower. + * FESTATE_TUNED. The frontend has successfully locked on. + * FESTATE_ZIGZAG_FAST. The lock has been lost, and a fast zigzag has been initiated to try and regain it. + * FESTATE_ZIGZAG_SLOW. The lock has been lost. Fast zigzag has been failed, so we're trying again, but slower. + * FESTATE_DISEQC. A DISEQC command has just been issued. + * FESTATE_WAITFORLOCK. When we're waiting for a lock. + * FESTATE_SEARCHING_FAST. When we're searching for a signal using a fast zigzag scan. + * FESTATE_SEARCHING_SLOW. When we're searching for a signal using a slow zigzag scan. + * FESTATE_LOSTLOCK. When the lock has been lost, and we're searching it again. + */ + +#define DVB_FE_NO_EXIT 0 +#define DVB_FE_NORMAL_EXIT 1 +#define DVB_FE_DEVICE_REMOVED 2 + +static DEFINE_MUTEX(frontend_mutex); + +struct dvb_frontend_private { + + /* thread/frontend values */ + struct dvb_device *dvbdev; + struct dvb_frontend_parameters parameters_out; + struct dvb_fe_events events; + struct semaphore sem; + struct list_head list_head; + wait_queue_head_t wait_queue; + struct task_struct *thread; + unsigned long release_jiffies; + unsigned int exit; + unsigned int wakeup; + fe_status_t status; + unsigned long tune_mode_flags; + unsigned int delay; + unsigned int reinitialise; + int tone; + int voltage; + + /* swzigzag values */ + unsigned int state; + unsigned int bending; + int lnb_drift; + unsigned int inversion; + unsigned int auto_step; + unsigned int auto_sub_step; + unsigned int started_auto_step; + unsigned int min_delay; + unsigned int max_drift; + unsigned int step_size; + int quality; + unsigned int check_wrapped; + enum dvbfe_search algo_status; +}; + +static void dvb_frontend_wakeup(struct dvb_frontend *fe); +static int dtv_get_frontend(struct dvb_frontend *fe, + struct dvb_frontend_parameters *p_out); +static int dtv_property_legacy_params_sync(struct dvb_frontend *fe, + struct dvb_frontend_parameters *p); + +static bool has_get_frontend(struct dvb_frontend *fe) +{ + return fe->ops.get_frontend != NULL; +} + +/* + * Due to DVBv3 API calls, a delivery system should be mapped into one of + * the 4 DVBv3 delivery systems (FE_QPSK, FE_QAM, FE_OFDM or FE_ATSC), + * otherwise, a DVBv3 call will fail. + */ +enum dvbv3_emulation_type { + DVBV3_UNKNOWN, + DVBV3_QPSK, + DVBV3_QAM, + DVBV3_OFDM, + DVBV3_ATSC, +}; + +static enum dvbv3_emulation_type dvbv3_type(u32 delivery_system) +{ + switch (delivery_system) { + case SYS_DVBC_ANNEX_A: + case SYS_DVBC_ANNEX_C: + return DVBV3_QAM; + case SYS_DVBS: + case SYS_DVBS2: + case SYS_TURBO: + case SYS_ISDBS: + case SYS_DSS: + return DVBV3_QPSK; + case SYS_DVBT: + case SYS_DVBT2: + case SYS_ISDBT: + case SYS_DTMB: + return DVBV3_OFDM; + case SYS_ATSC: + case SYS_ATSCMH: + case SYS_DVBC_ANNEX_B: + return DVBV3_ATSC; + case SYS_UNDEFINED: + case SYS_ISDBC: + case SYS_DVBH: + case SYS_DAB: + default: + /* + * Doesn't know how to emulate those types and/or + * there's no frontend driver from this type yet + * with some emulation code, so, we're not sure yet how + * to handle them, or they're not compatible with a DVBv3 call. + */ + return DVBV3_UNKNOWN; + } +} + +static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status) +{ + struct dvb_frontend_private *fepriv = fe->frontend_priv; + struct dvb_fe_events *events = &fepriv->events; + struct dvb_frontend_event *e; + int wp; + + dev_dbg(fe->dvb->device, "%s:\n", __func__); + + if ((status & FE_HAS_LOCK) && has_get_frontend(fe)) + dtv_get_frontend(fe, &fepriv->parameters_out); + + mutex_lock(&events->mtx); + + wp = (events->eventw + 1) % MAX_EVENT; + if (wp == events->eventr) { + events->overflow = 1; + events->eventr = (events->eventr + 1) % MAX_EVENT; + } + + e = &events->events[events->eventw]; + e->status = status; + e->parameters = fepriv->parameters_out; + + events->eventw = wp; + + mutex_unlock(&events->mtx); + + wake_up_interruptible (&events->wait_queue); +} + +static int dvb_frontend_get_event(struct dvb_frontend *fe, + struct dvb_frontend_event *event, int flags) +{ + struct dvb_frontend_private *fepriv = fe->frontend_priv; + struct dvb_fe_events *events = &fepriv->events; + + dev_dbg(fe->dvb->device, "%s:\n", __func__); + + if (events->overflow) { + events->overflow = 0; + return -EOVERFLOW; + } + + if (events->eventw == events->eventr) { + int ret; + + if (flags & O_NONBLOCK) + return -EWOULDBLOCK; + + up(&fepriv->sem); + + ret = wait_event_interruptible (events->wait_queue, + events->eventw != events->eventr); + + if (down_interruptible (&fepriv->sem)) + return -ERESTARTSYS; + + if (ret < 0) + return ret; + } + + mutex_lock(&events->mtx); + *event = events->events[events->eventr]; + events->eventr = (events->eventr + 1) % MAX_EVENT; + mutex_unlock(&events->mtx); + + return 0; +} + +static void dvb_frontend_clear_events(struct dvb_frontend *fe) +{ + struct dvb_frontend_private *fepriv = fe->frontend_priv; + struct dvb_fe_events *events = &fepriv->events; + + mutex_lock(&events->mtx); + events->eventr = events->eventw; + mutex_unlock(&events->mtx); +} + +static void dvb_frontend_init(struct dvb_frontend *fe) +{ + dev_dbg(fe->dvb->device, + "%s: initialising adapter %i frontend %i (%s)...\n", + __func__, fe->dvb->num, fe->id, fe->ops.info.name); + + if (fe->ops.init) + fe->ops.init(fe); + if (fe->ops.tuner_ops.init) { + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + fe->ops.tuner_ops.init(fe); + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + } +} + +void dvb_frontend_reinitialise(struct dvb_frontend *fe) +{ + struct dvb_frontend_private *fepriv = fe->frontend_priv; + + fepriv->reinitialise = 1; + dvb_frontend_wakeup(fe); +} +EXPORT_SYMBOL(dvb_frontend_reinitialise); + +static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked) +{ + int q2; + struct dvb_frontend *fe = fepriv->dvbdev->priv; + + dev_dbg(fe->dvb->device, "%s:\n", __func__); + + if (locked) + (fepriv->quality) = (fepriv->quality * 220 + 36*256) / 256; + else + (fepriv->quality) = (fepriv->quality * 220 + 0) / 256; + + q2 = fepriv->quality - 128; + q2 *= q2; + + fepriv->delay = fepriv->min_delay + q2 * HZ / (128*128); +} + +/** + * Performs automatic twiddling of frontend parameters. + * + * @param fe The frontend concerned. + * @param check_wrapped Checks if an iteration has completed. DO NOT SET ON THE FIRST ATTEMPT + * @returns Number of complete iterations that have been performed. + */ +static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wrapped) +{ + int autoinversion; + int ready = 0; + int fe_set_err = 0; + struct dvb_frontend_private *fepriv = fe->frontend_priv; + struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp; + int original_inversion = c->inversion; + u32 original_frequency = c->frequency; + + /* are we using autoinversion? */ + autoinversion = ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) && + (c->inversion == INVERSION_AUTO)); + + /* setup parameters correctly */ + while(!ready) { + /* calculate the lnb_drift */ + fepriv->lnb_drift = fepriv->auto_step * fepriv->step_size; + + /* wrap the auto_step if we've exceeded the maximum drift */ + if (fepriv->lnb_drift > fepriv->max_drift) { + fepriv->auto_step = 0; + fepriv->auto_sub_step = 0; + fepriv->lnb_drift = 0; + } + + /* perform inversion and +/- zigzag */ + switch(fepriv->auto_sub_step) { + case 0: + /* try with the current inversion and current drift setting */ + ready = 1; + break; + + case 1: + if (!autoinversion) break; + + fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF; + ready = 1; + break; + + case 2: + if (fepriv->lnb_drift == 0) break; + + fepriv->lnb_drift = -fepriv->lnb_drift; + ready = 1; + break; + + case 3: + if (fepriv->lnb_drift == 0) break; + if (!autoinversion) break; + + fepriv->inversion = (fepriv->inversion == INVERSION_OFF) ? INVERSION_ON : INVERSION_OFF; + fepriv->lnb_drift = -fepriv->lnb_drift; + ready = 1; + break; + + default: + fepriv->auto_step++; + fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */ + break; + } + + if (!ready) fepriv->auto_sub_step++; + } + + /* if this attempt would hit where we started, indicate a complete + * iteration has occurred */ + if ((fepriv->auto_step == fepriv->started_auto_step) && + (fepriv->auto_sub_step == 0) && check_wrapped) { + return 1; + } + + dev_dbg(fe->dvb->device, "%s: drift:%i inversion:%i auto_step:%i " \ + "auto_sub_step:%i started_auto_step:%i\n", + __func__, fepriv->lnb_drift, fepriv->inversion, + fepriv->auto_step, fepriv->auto_sub_step, + fepriv->started_auto_step); + + /* set the frontend itself */ + c->frequency += fepriv->lnb_drift; + if (autoinversion) + c->inversion = fepriv->inversion; + tmp = *c; + if (fe->ops.set_frontend) + fe_set_err = fe->ops.set_frontend(fe); + *c = tmp; + if (fe_set_err < 0) { + fepriv->state = FESTATE_ERROR; + return fe_set_err; + } + + c->frequency = original_frequency; + c->inversion = original_inversion; + + fepriv->auto_sub_step++; + return 0; +} + +static void dvb_frontend_swzigzag(struct dvb_frontend *fe) +{ + fe_status_t s = 0; + int retval = 0; + struct dvb_frontend_private *fepriv = fe->frontend_priv; + struct dtv_frontend_properties *c = &fe->dtv_property_cache, tmp; + + /* if we've got no parameters, just keep idling */ + if (fepriv->state & FESTATE_IDLE) { + fepriv->delay = 3*HZ; + fepriv->quality = 0; + return; + } + + /* in SCAN mode, we just set the frontend when asked and leave it alone */ + if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) { + if (fepriv->state & FESTATE_RETUNE) { + tmp = *c; + if (fe->ops.set_frontend) + retval = fe->ops.set_frontend(fe); + *c = tmp; + if (retval < 0) + fepriv->state = FESTATE_ERROR; + else + fepriv->state = FESTATE_TUNED; + } + fepriv->delay = 3*HZ; + fepriv->quality = 0; + return; + } + + /* get the frontend status */ + if (fepriv->state & FESTATE_RETUNE) { + s = 0; + } else { + if (fe->ops.read_status) + fe->ops.read_status(fe, &s); + if (s != fepriv->status) { + dvb_frontend_add_event(fe, s); + fepriv->status = s; + } + } + + /* if we're not tuned, and we have a lock, move to the TUNED state */ + if ((fepriv->state & FESTATE_WAITFORLOCK) && (s & FE_HAS_LOCK)) { + dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); + fepriv->state = FESTATE_TUNED; + + /* if we're tuned, then we have determined the correct inversion */ + if ((!(fe->ops.info.caps & FE_CAN_INVERSION_AUTO)) && + (c->inversion == INVERSION_AUTO)) { + c->inversion = fepriv->inversion; + } + return; + } + + /* if we are tuned already, check we're still locked */ + if (fepriv->state & FESTATE_TUNED) { + dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); + + /* we're tuned, and the lock is still good... */ + if (s & FE_HAS_LOCK) { + return; + } else { /* if we _WERE_ tuned, but now don't have a lock */ + fepriv->state = FESTATE_ZIGZAG_FAST; + fepriv->started_auto_step = fepriv->auto_step; + fepriv->check_wrapped = 0; + } + } + + /* don't actually do anything if we're in the LOSTLOCK state, + * the frontend is set to FE_CAN_RECOVER, and the max_drift is 0 */ + if ((fepriv->state & FESTATE_LOSTLOCK) && + (fe->ops.info.caps & FE_CAN_RECOVER) && (fepriv->max_drift == 0)) { + dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); + return; + } + + /* don't do anything if we're in the DISEQC state, since this + * might be someone with a motorized dish controlled by DISEQC. + * If its actually a re-tune, there will be a SET_FRONTEND soon enough. */ + if (fepriv->state & FESTATE_DISEQC) { + dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); + return; + } + + /* if we're in the RETUNE state, set everything up for a brand + * new scan, keeping the current inversion setting, as the next + * tune is _very_ likely to require the same */ + if (fepriv->state & FESTATE_RETUNE) { + fepriv->lnb_drift = 0; + fepriv->auto_step = 0; + fepriv->auto_sub_step = 0; + fepriv->started_auto_step = 0; + fepriv->check_wrapped = 0; + } + + /* fast zigzag. */ + if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) { + fepriv->delay = fepriv->min_delay; + + /* perform a tune */ + retval = dvb_frontend_swzigzag_autotune(fe, + fepriv->check_wrapped); + if (retval < 0) { + return; + } else if (retval) { + /* OK, if we've run out of trials at the fast speed. + * Drop back to slow for the _next_ attempt */ + fepriv->state = FESTATE_SEARCHING_SLOW; + fepriv->started_auto_step = fepriv->auto_step; + return; + } + fepriv->check_wrapped = 1; + + /* if we've just retuned, enter the ZIGZAG_FAST state. + * This ensures we cannot return from an + * FE_SET_FRONTEND ioctl before the first frontend tune + * occurs */ + if (fepriv->state & FESTATE_RETUNE) { + fepriv->state = FESTATE_TUNING_FAST; + } + } + + /* slow zigzag */ + if (fepriv->state & FESTATE_SEARCHING_SLOW) { + dvb_frontend_swzigzag_update_delay(fepriv, s & FE_HAS_LOCK); + + /* Note: don't bother checking for wrapping; we stay in this + * state until we get a lock */ + dvb_frontend_swzigzag_autotune(fe, 0); + } +} + +static int dvb_frontend_is_exiting(struct dvb_frontend *fe) +{ + struct dvb_frontend_private *fepriv = fe->frontend_priv; + + if (fepriv->exit != DVB_FE_NO_EXIT) + return 1; + + if (fepriv->dvbdev->writers == 1) + if (time_after_eq(jiffies, fepriv->release_jiffies + + dvb_shutdown_timeout * HZ)) + return 1; + + return 0; +} + +static int dvb_frontend_should_wakeup(struct dvb_frontend *fe) +{ + struct dvb_frontend_private *fepriv = fe->frontend_priv; + + if (fepriv->wakeup) { + fepriv->wakeup = 0; + return 1; + } + return dvb_frontend_is_exiting(fe); +} + +static void dvb_frontend_wakeup(struct dvb_frontend *fe) +{ + struct dvb_frontend_private *fepriv = fe->frontend_priv; + + fepriv->wakeup = 1; + wake_up_interruptible(&fepriv->wait_queue); +} + +static int dvb_frontend_thread(void *data) +{ + struct dvb_frontend *fe = data; + struct dvb_frontend_private *fepriv = fe->frontend_priv; + fe_status_t s; + enum dvbfe_algo algo; + + bool re_tune = false; + + dev_dbg(fe->dvb->device, "%s:\n", __func__); + + fepriv->check_wrapped = 0; + fepriv->quality = 0; + fepriv->delay = 3*HZ; + fepriv->status = 0; + fepriv->wakeup = 0; + fepriv->reinitialise = 0; + + dvb_frontend_init(fe); + + set_freezable(); + while (1) { + up(&fepriv->sem); /* is locked when we enter the thread... */ +restart: + wait_event_interruptible_timeout(fepriv->wait_queue, + dvb_frontend_should_wakeup(fe) || kthread_should_stop() + || freezing(current), + fepriv->delay); + + if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) { + /* got signal or quitting */ + fepriv->exit = DVB_FE_NORMAL_EXIT; + break; + } + + if (try_to_freeze()) + goto restart; + + if (down_interruptible(&fepriv->sem)) + break; + + if (fepriv->reinitialise) { + dvb_frontend_init(fe); + if (fe->ops.set_tone && fepriv->tone != -1) + fe->ops.set_tone(fe, fepriv->tone); + if (fe->ops.set_voltage && fepriv->voltage != -1) + fe->ops.set_voltage(fe, fepriv->voltage); + fepriv->reinitialise = 0; + } + + /* do an iteration of the tuning loop */ + if (fe->ops.get_frontend_algo) { + algo = fe->ops.get_frontend_algo(fe); + switch (algo) { + case DVBFE_ALGO_HW: + dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_HW\n", __func__); + + if (fepriv->state & FESTATE_RETUNE) { + dev_dbg(fe->dvb->device, "%s: Retune requested, FESTATE_RETUNE\n", __func__); + re_tune = true; + fepriv->state = FESTATE_TUNED; + } else { + re_tune = false; + } + + if (fe->ops.tune) + fe->ops.tune(fe, re_tune, fepriv->tune_mode_flags, &fepriv->delay, &s); + + if (s != fepriv->status && !(fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT)) { + dev_dbg(fe->dvb->device, "%s: state changed, adding current state\n", __func__); + dvb_frontend_add_event(fe, s); + fepriv->status = s; + } + break; + case DVBFE_ALGO_SW: + dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_SW\n", __func__); + dvb_frontend_swzigzag(fe); + break; + case DVBFE_ALGO_CUSTOM: + dev_dbg(fe->dvb->device, "%s: Frontend ALGO = DVBFE_ALGO_CUSTOM, state=%d\n", __func__, fepriv->state); + if (fepriv->state & FESTATE_RETUNE) { + dev_dbg(fe->dvb->device, "%s: Retune requested, FESTAT_RETUNE\n", __func__); + fepriv->state = FESTATE_TUNED; + } + /* Case where we are going to search for a carrier + * User asked us to retune again for some reason, possibly + * requesting a search with a new set of parameters + */ + if (fepriv->algo_status & DVBFE_ALGO_SEARCH_AGAIN) { + if (fe->ops.search) { + fepriv->algo_status = fe->ops.search(fe); + /* We did do a search as was requested, the flags are + * now unset as well and has the flags wrt to search. + */ + } else { + fepriv->algo_status &= ~DVBFE_ALGO_SEARCH_AGAIN; + } + } + /* Track the carrier if the search was successful */ + if (fepriv->algo_status != DVBFE_ALGO_SEARCH_SUCCESS) { + fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN; + fepriv->delay = HZ / 2; + } + dtv_property_legacy_params_sync(fe, &fepriv->parameters_out); + fe->ops.read_status(fe, &s); + if (s != fepriv->status) { + dvb_frontend_add_event(fe, s); /* update event list */ + fepriv->status = s; + if (!(s & FE_HAS_LOCK)) { + fepriv->delay = HZ / 10; + fepriv->algo_status |= DVBFE_ALGO_SEARCH_AGAIN; + } else { + fepriv->delay = 60 * HZ; + } + } + break; + default: + dev_dbg(fe->dvb->device, "%s: UNDEFINED ALGO !\n", __func__); + break; + } + } else { + dvb_frontend_swzigzag(fe); + } + } + + if (dvb_powerdown_on_sleep) { + if (fe->ops.set_voltage) + fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF); + if (fe->ops.tuner_ops.sleep) { + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + fe->ops.tuner_ops.sleep(fe); + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + } + if (fe->ops.sleep) + fe->ops.sleep(fe); + } + + fepriv->thread = NULL; + if (kthread_should_stop()) + fepriv->exit = DVB_FE_DEVICE_REMOVED; + else + fepriv->exit = DVB_FE_NO_EXIT; + mb(); + + dvb_frontend_wakeup(fe); + return 0; +} + +static void dvb_frontend_stop(struct dvb_frontend *fe) +{ + struct dvb_frontend_private *fepriv = fe->frontend_priv; + + dev_dbg(fe->dvb->device, "%s:\n", __func__); + + fepriv->exit = DVB_FE_NORMAL_EXIT; + mb(); + + if (!fepriv->thread) + return; + + kthread_stop(fepriv->thread); + + sema_init(&fepriv->sem, 1); + fepriv->state = FESTATE_IDLE; + + /* paranoia check in case a signal arrived */ + if (fepriv->thread) + dev_warn(fe->dvb->device, + "dvb_frontend_stop: warning: thread %p won't exit\n", + fepriv->thread); +} + +s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime) +{ + return ((curtime.tv_usec < lasttime.tv_usec) ? + 1000000 - lasttime.tv_usec + curtime.tv_usec : + curtime.tv_usec - lasttime.tv_usec); +} +EXPORT_SYMBOL(timeval_usec_diff); + +static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec) +{ + curtime->tv_usec += add_usec; + if (curtime->tv_usec >= 1000000) { + curtime->tv_usec -= 1000000; + curtime->tv_sec++; + } +} + +/* + * Sleep until gettimeofday() > waketime + add_usec + * This needs to be as precise as possible, but as the delay is + * usually between 2ms and 32ms, it is done using a scheduled msleep + * followed by usleep (normally a busy-wait loop) for the remainder + */ +void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec) +{ + struct timeval lasttime; + s32 delta, newdelta; + + timeval_usec_add(waketime, add_usec); + + do_gettimeofday(&lasttime); + delta = timeval_usec_diff(lasttime, *waketime); + if (delta > 2500) { + msleep((delta - 1500) / 1000); + do_gettimeofday(&lasttime); + newdelta = timeval_usec_diff(lasttime, *waketime); + delta = (newdelta > delta) ? 0 : newdelta; + } + if (delta > 0) + udelay(delta); +} +EXPORT_SYMBOL(dvb_frontend_sleep_until); + +static int dvb_frontend_start(struct dvb_frontend *fe) +{ + int ret; + struct dvb_frontend_private *fepriv = fe->frontend_priv; + struct task_struct *fe_thread; + + dev_dbg(fe->dvb->device, "%s:\n", __func__); + + if (fepriv->thread) { + if (fepriv->exit == DVB_FE_NO_EXIT) + return 0; + else + dvb_frontend_stop (fe); + } + + if (signal_pending(current)) + return -EINTR; + if (down_interruptible (&fepriv->sem)) + return -EINTR; + + fepriv->state = FESTATE_IDLE; + fepriv->exit = DVB_FE_NO_EXIT; + fepriv->thread = NULL; + mb(); + + fe_thread = kthread_run(dvb_frontend_thread, fe, + "kdvb-ad-%i-fe-%i", fe->dvb->num,fe->id); + if (IS_ERR(fe_thread)) { + ret = PTR_ERR(fe_thread); + dev_warn(fe->dvb->device, + "dvb_frontend_start: failed to start kthread (%d)\n", + ret); + up(&fepriv->sem); + return ret; + } + fepriv->thread = fe_thread; + return 0; +} + +static void dvb_frontend_get_frequency_limits(struct dvb_frontend *fe, + u32 *freq_min, u32 *freq_max) +{ + *freq_min = max(fe->ops.info.frequency_min, fe->ops.tuner_ops.info.frequency_min); + + if (fe->ops.info.frequency_max == 0) + *freq_max = fe->ops.tuner_ops.info.frequency_max; + else if (fe->ops.tuner_ops.info.frequency_max == 0) + *freq_max = fe->ops.info.frequency_max; + else + *freq_max = min(fe->ops.info.frequency_max, fe->ops.tuner_ops.info.frequency_max); + + if (*freq_min == 0 || *freq_max == 0) + dev_warn(fe->dvb->device, "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n", + fe->dvb->num, fe->id); +} + +static int dvb_frontend_check_parameters(struct dvb_frontend *fe) +{ + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + u32 freq_min; + u32 freq_max; + + /* range check: frequency */ + dvb_frontend_get_frequency_limits(fe, &freq_min, &freq_max); + if ((freq_min && c->frequency < freq_min) || + (freq_max && c->frequency > freq_max)) { + dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i frequency %u out of range (%u..%u)\n", + fe->dvb->num, fe->id, c->frequency, + freq_min, freq_max); + return -EINVAL; + } + + /* range check: symbol rate */ + switch (c->delivery_system) { + case SYS_DVBS: + case SYS_DVBS2: + case SYS_TURBO: + case SYS_DVBC_ANNEX_A: + case SYS_DVBC_ANNEX_C: + if ((fe->ops.info.symbol_rate_min && + c->symbol_rate < fe->ops.info.symbol_rate_min) || + (fe->ops.info.symbol_rate_max && + c->symbol_rate > fe->ops.info.symbol_rate_max)) { + dev_warn(fe->dvb->device, "DVB: adapter %i frontend %i symbol rate %u out of range (%u..%u)\n", + fe->dvb->num, fe->id, c->symbol_rate, + fe->ops.info.symbol_rate_min, + fe->ops.info.symbol_rate_max); + return -EINVAL; + } + default: + break; + } + + return 0; +} + +static int dvb_frontend_clear_cache(struct dvb_frontend *fe) +{ + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + int i; + u32 delsys; + + delsys = c->delivery_system; + memset(c, 0, sizeof(struct dtv_frontend_properties)); + c->delivery_system = delsys; + + c->state = DTV_CLEAR; + + dev_dbg(fe->dvb->device, "%s: Clearing cache for delivery system %d\n", + __func__, c->delivery_system); + + c->transmission_mode = TRANSMISSION_MODE_AUTO; + c->bandwidth_hz = 0; /* AUTO */ + c->guard_interval = GUARD_INTERVAL_AUTO; + c->hierarchy = HIERARCHY_AUTO; + c->symbol_rate = 0; + c->code_rate_HP = FEC_AUTO; + c->code_rate_LP = FEC_AUTO; + c->fec_inner = FEC_AUTO; + c->rolloff = ROLLOFF_AUTO; + c->voltage = SEC_VOLTAGE_OFF; + c->sectone = SEC_TONE_OFF; + c->pilot = PILOT_AUTO; + + c->isdbt_partial_reception = 0; + c->isdbt_sb_mode = 0; + c->isdbt_sb_subchannel = 0; + c->isdbt_sb_segment_idx = 0; + c->isdbt_sb_segment_count = 0; + c->isdbt_layer_enabled = 0; + for (i = 0; i < 3; i++) { + c->layer[i].fec = FEC_AUTO; + c->layer[i].modulation = QAM_AUTO; + c->layer[i].interleaving = 0; + c->layer[i].segment_count = 0; + } + + c->stream_id = NO_STREAM_ID_FILTER; + + switch (c->delivery_system) { + case SYS_DVBS: + case SYS_DVBS2: + case SYS_TURBO: + c->modulation = QPSK; /* implied for DVB-S in legacy API */ + c->rolloff = ROLLOFF_35;/* implied for DVB-S */ + break; + case SYS_ATSC: + c->modulation = VSB_8; + break; + default: + c->modulation = QAM_AUTO; + break; + } + + return 0; +} + +#define _DTV_CMD(n, s, b) \ +[n] = { \ + .name = #n, \ + .cmd = n, \ + .set = s,\ + .buffer = b \ +} + +static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = { + _DTV_CMD(DTV_TUNE, 1, 0), + _DTV_CMD(DTV_CLEAR, 1, 0), + + /* Set */ + _DTV_CMD(DTV_FREQUENCY, 1, 0), + _DTV_CMD(DTV_BANDWIDTH_HZ, 1, 0), + _DTV_CMD(DTV_MODULATION, 1, 0), + _DTV_CMD(DTV_INVERSION, 1, 0), + _DTV_CMD(DTV_DISEQC_MASTER, 1, 1), + _DTV_CMD(DTV_SYMBOL_RATE, 1, 0), + _DTV_CMD(DTV_INNER_FEC, 1, 0), + _DTV_CMD(DTV_VOLTAGE, 1, 0), + _DTV_CMD(DTV_TONE, 1, 0), + _DTV_CMD(DTV_PILOT, 1, 0), + _DTV_CMD(DTV_ROLLOFF, 1, 0), + _DTV_CMD(DTV_DELIVERY_SYSTEM, 1, 0), + _DTV_CMD(DTV_HIERARCHY, 1, 0), + _DTV_CMD(DTV_CODE_RATE_HP, 1, 0), + _DTV_CMD(DTV_CODE_RATE_LP, 1, 0), + _DTV_CMD(DTV_GUARD_INTERVAL, 1, 0), + _DTV_CMD(DTV_TRANSMISSION_MODE, 1, 0), + _DTV_CMD(DTV_INTERLEAVING, 1, 0), + + _DTV_CMD(DTV_ISDBT_PARTIAL_RECEPTION, 1, 0), + _DTV_CMD(DTV_ISDBT_SOUND_BROADCASTING, 1, 0), + _DTV_CMD(DTV_ISDBT_SB_SUBCHANNEL_ID, 1, 0), + _DTV_CMD(DTV_ISDBT_SB_SEGMENT_IDX, 1, 0), + _DTV_CMD(DTV_ISDBT_SB_SEGMENT_COUNT, 1, 0), + _DTV_CMD(DTV_ISDBT_LAYER_ENABLED, 1, 0), + _DTV_CMD(DTV_ISDBT_LAYERA_FEC, 1, 0), + _DTV_CMD(DTV_ISDBT_LAYERA_MODULATION, 1, 0), + _DTV_CMD(DTV_ISDBT_LAYERA_SEGMENT_COUNT, 1, 0), + _DTV_CMD(DTV_ISDBT_LAYERA_TIME_INTERLEAVING, 1, 0), + _DTV_CMD(DTV_ISDBT_LAYERB_FEC, 1, 0), + _DTV_CMD(DTV_ISDBT_LAYERB_MODULATION, 1, 0), + _DTV_CMD(DTV_ISDBT_LAYERB_SEGMENT_COUNT, 1, 0), + _DTV_CMD(DTV_ISDBT_LAYERB_TIME_INTERLEAVING, 1, 0), + _DTV_CMD(DTV_ISDBT_LAYERC_FEC, 1, 0), + _DTV_CMD(DTV_ISDBT_LAYERC_MODULATION, 1, 0), + _DTV_CMD(DTV_ISDBT_LAYERC_SEGMENT_COUNT, 1, 0), + _DTV_CMD(DTV_ISDBT_LAYERC_TIME_INTERLEAVING, 1, 0), + + _DTV_CMD(DTV_STREAM_ID, 1, 0), + _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY, 1, 0), + _DTV_CMD(DTV_LNA, 1, 0), + + /* Get */ + _DTV_CMD(DTV_DISEQC_SLAVE_REPLY, 0, 1), + _DTV_CMD(DTV_API_VERSION, 0, 0), + _DTV_CMD(DTV_CODE_RATE_HP, 0, 0), + _DTV_CMD(DTV_CODE_RATE_LP, 0, 0), + _DTV_CMD(DTV_GUARD_INTERVAL, 0, 0), + _DTV_CMD(DTV_TRANSMISSION_MODE, 0, 0), + _DTV_CMD(DTV_HIERARCHY, 0, 0), + _DTV_CMD(DTV_INTERLEAVING, 0, 0), + + _DTV_CMD(DTV_ENUM_DELSYS, 0, 0), + + _DTV_CMD(DTV_ATSCMH_PARADE_ID, 1, 0), + _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE, 1, 0), + + _DTV_CMD(DTV_ATSCMH_FIC_VER, 0, 0), + _DTV_CMD(DTV_ATSCMH_PARADE_ID, 0, 0), + _DTV_CMD(DTV_ATSCMH_NOG, 0, 0), + _DTV_CMD(DTV_ATSCMH_TNOG, 0, 0), + _DTV_CMD(DTV_ATSCMH_SGN, 0, 0), + _DTV_CMD(DTV_ATSCMH_PRC, 0, 0), + _DTV_CMD(DTV_ATSCMH_RS_FRAME_MODE, 0, 0), + _DTV_CMD(DTV_ATSCMH_RS_FRAME_ENSEMBLE, 0, 0), + _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_PRI, 0, 0), + _DTV_CMD(DTV_ATSCMH_RS_CODE_MODE_SEC, 0, 0), + _DTV_CMD(DTV_ATSCMH_SCCC_BLOCK_MODE, 0, 0), + _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_A, 0, 0), + _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_B, 0, 0), + _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_C, 0, 0), + _DTV_CMD(DTV_ATSCMH_SCCC_CODE_MODE_D, 0, 0), +}; + +static void dtv_property_dump(struct dvb_frontend *fe, struct dtv_property *tvp) +{ + int i; + + if (tvp->cmd <= 0 || tvp->cmd > DTV_MAX_COMMAND) { + dev_warn(fe->dvb->device, "%s: tvp.cmd = 0x%08x undefined\n", + __func__, tvp->cmd); + return; + } + + dev_dbg(fe->dvb->device, "%s: tvp.cmd = 0x%08x (%s)\n", __func__, + tvp->cmd, dtv_cmds[tvp->cmd].name); + + if (dtv_cmds[tvp->cmd].buffer) { + dev_dbg(fe->dvb->device, "%s: tvp.u.buffer.len = 0x%02x\n", + __func__, tvp->u.buffer.len); + + for(i = 0; i < tvp->u.buffer.len; i++) + dev_dbg(fe->dvb->device, + "%s: tvp.u.buffer.data[0x%02x] = 0x%02x\n", + __func__, i, tvp->u.buffer.data[i]); + } else { + dev_dbg(fe->dvb->device, "%s: tvp.u.data = 0x%08x\n", __func__, + tvp->u.data); + } +} + +/* Synchronise the legacy tuning parameters into the cache, so that demodulator + * drivers can use a single set_frontend tuning function, regardless of whether + * it's being used for the legacy or new API, reducing code and complexity. + */ +static int dtv_property_cache_sync(struct dvb_frontend *fe, + struct dtv_frontend_properties *c, + const struct dvb_frontend_parameters *p) +{ + c->frequency = p->frequency; + c->inversion = p->inversion; + + switch (dvbv3_type(c->delivery_system)) { + case DVBV3_QPSK: + dev_dbg(fe->dvb->device, "%s: Preparing QPSK req\n", __func__); + c->symbol_rate = p->u.qpsk.symbol_rate; + c->fec_inner = p->u.qpsk.fec_inner; + break; + case DVBV3_QAM: + dev_dbg(fe->dvb->device, "%s: Preparing QAM req\n", __func__); + c->symbol_rate = p->u.qam.symbol_rate; + c->fec_inner = p->u.qam.f |