diff options
Diffstat (limited to 'drivers/media/dvb/dvb-core/dvb_frontend.c')
| -rw-r--r-- | drivers/media/dvb/dvb-core/dvb_frontend.c | 915 |
1 files changed, 915 insertions, 0 deletions
diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c new file mode 100644 index 000000000000..59a9adfae1eb --- /dev/null +++ b/drivers/media/dvb/dvb-core/dvb_frontend.c @@ -0,0 +1,915 @@ +/* + * 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 + */ + +#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/module.h> +#include <linux/moduleparam.h> +#include <linux/list.h> +#include <linux/suspend.h> +#include <asm/processor.h> +#include <asm/semaphore.h> + +#include "dvb_frontend.h" +#include "dvbdev.h" + +static int dvb_frontend_debug; +static int dvb_shutdown_timeout = 5; +static int dvb_force_auto_inversion; +static int dvb_override_tune_delay; +static int dvb_powerdown_on_sleep = 1; + +module_param_named(frontend_debug, dvb_frontend_debug, int, 0644); +MODULE_PARM_DESC(dvb_frontend_debug, "Turn on/off frontend core debugging (default:off)."); +module_param(dvb_shutdown_timeout, int, 0444); +MODULE_PARM_DESC(dvb_shutdown_timeout, "wait <shutdown_timeout> seconds after close() before suspending hardware"); +module_param(dvb_force_auto_inversion, int, 0444); +MODULE_PARM_DESC(dvb_force_auto_inversion, "0: normal (default), 1: INVERSION_AUTO forced always"); +module_param(dvb_override_tune_delay, int, 0444); +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, 0444); +MODULE_PARM_DESC(dvb_powerdown_on_sleep, "0: do not power down, 1: turn LNB volatage off on sleep (default)"); + +#define dprintk if (dvb_frontend_debug) printk + +#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_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) +/* + * 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. + */ + +static DECLARE_MUTEX(frontend_mutex); + +struct dvb_frontend_private { + + struct dvb_device *dvbdev; + struct dvb_frontend_parameters parameters; + struct dvb_fe_events events; + struct semaphore sem; + struct list_head list_head; + wait_queue_head_t wait_queue; + pid_t thread_pid; + unsigned long release_jiffies; + int state; + int bending; + int lnb_drift; + int inversion; + int auto_step; + int auto_sub_step; + int started_auto_step; + int min_delay; + int max_drift; + int step_size; + int exit; + int wakeup; + fe_status_t status; +}; + + +static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status) +{ + struct dvb_frontend_private *fepriv = (struct dvb_frontend_private*) fe->frontend_priv; + struct dvb_fe_events *events = &fepriv->events; + struct dvb_frontend_event *e; + int wp; + + dprintk ("%s\n", __FUNCTION__); + + if (down_interruptible (&events->sem)) + return; + + 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]; + + memcpy (&e->parameters, &fepriv->parameters, + sizeof (struct dvb_frontend_parameters)); + + if (status & FE_HAS_LOCK) + if (fe->ops->get_frontend) + fe->ops->get_frontend(fe, &e->parameters); + + events->eventw = wp; + + up (&events->sem); + + e->status = status; + + 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 = (struct dvb_frontend_private*) fe->frontend_priv; + struct dvb_fe_events *events = &fepriv->events; + + dprintk ("%s\n", __FUNCTION__); + + 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; + } + + if (down_interruptible (&events->sem)) + return -ERESTARTSYS; + + memcpy (event, &events->events[events->eventr], + sizeof(struct dvb_frontend_event)); + + events->eventr = (events->eventr + 1) % MAX_EVENT; + + up (&events->sem); + + return 0; +} + +static void dvb_frontend_init(struct dvb_frontend *fe) +{ + dprintk ("DVB: initialising frontend %i (%s)...\n", + fe->dvb->num, + fe->ops->info.name); + + if (fe->ops->init) + fe->ops->init(fe); +} + +static void update_delay(int *quality, int *delay, int min_delay, int locked) +{ + int q2; + + dprintk ("%s\n", __FUNCTION__); + + if (locked) + (*quality) = (*quality * 220 + 36*256) / 256; + else + (*quality) = (*quality * 220 + 0) / 256; + + q2 = *quality - 128; + q2 *= q2; + + *delay = 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_autotune(struct dvb_frontend *fe, int check_wrapped) +{ + int autoinversion; + int ready = 0; + struct dvb_frontend_private *fepriv = (struct dvb_frontend_private*) fe->frontend_priv; + int original_inversion = fepriv->parameters.inversion; + u32 original_frequency = fepriv->parameters.frequency; + + /* are we using autoinversion? */ + autoinversion = ((!(fe->ops->info.caps & FE_CAN_INVERSION_AUTO)) && + (fepriv->parameters.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; + } + + dprintk("%s: drift:%i inversion:%i auto_step:%i " + "auto_sub_step:%i started_auto_step:%i\n", + __FUNCTION__, fepriv->lnb_drift, fepriv->inversion, + fepriv->auto_step, fepriv->auto_sub_step, fepriv->started_auto_step); + + /* set the frontend itself */ + fepriv->parameters.frequency += fepriv->lnb_drift; + if (autoinversion) + fepriv->parameters.inversion = fepriv->inversion; + if (fe->ops->set_frontend) + fe->ops->set_frontend(fe, &fepriv->parameters); + + fepriv->parameters.frequency = original_frequency; + fepriv->parameters.inversion = original_inversion; + + fepriv->auto_sub_step++; + return 0; +} + +static int dvb_frontend_is_exiting(struct dvb_frontend *fe) +{ + struct dvb_frontend_private *fepriv = (struct dvb_frontend_private*) fe->frontend_priv; + + if (fepriv->exit) + return 1; + + if (fepriv->dvbdev->writers == 1) + if (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 = (struct dvb_frontend_private*) 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 = (struct dvb_frontend_private*) fe->frontend_priv; + + fepriv->wakeup = 1; + wake_up_interruptible(&fepriv->wait_queue); +} + +/* + * FIXME: use linux/kthread.h + */ +static int dvb_frontend_thread(void *data) +{ + struct dvb_frontend *fe = (struct dvb_frontend *) data; + struct dvb_frontend_private *fepriv = (struct dvb_frontend_private*) fe->frontend_priv; + unsigned long timeout; + char name [15]; + int quality = 0, delay = 3*HZ; + fe_status_t s; + int check_wrapped = 0; + + dprintk("%s\n", __FUNCTION__); + + snprintf (name, sizeof(name), "kdvb-fe-%i", fe->dvb->num); + + lock_kernel(); + daemonize(name); + sigfillset(¤t->blocked); + unlock_kernel(); + + fepriv->status = 0; + dvb_frontend_init(fe); + fepriv->wakeup = 0; + + while (1) { + up(&fepriv->sem); /* is locked when we enter the thread... */ + + timeout = wait_event_interruptible_timeout(fepriv->wait_queue, + dvb_frontend_should_wakeup(fe), + delay); + if (0 != dvb_frontend_is_exiting(fe)) { + /* got signal or quitting */ + break; + } + + if (current->flags & PF_FREEZE) + refrigerator(PF_FREEZE); + + if (down_interruptible(&fepriv->sem)) + break; + + /* if we've got no parameters, just keep idling */ + if (fepriv->state & FESTATE_IDLE) { + delay = 3*HZ; + quality = 0; + continue; + } + + /* 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)) { + update_delay(&quality, &delay, fepriv->min_delay, 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)) && + (fepriv->parameters.inversion == INVERSION_AUTO)) { + fepriv->parameters.inversion = fepriv->inversion; + } + continue; + } + + /* if we are tuned already, check we're still locked */ + if (fepriv->state & FESTATE_TUNED) { + update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK); + + /* we're tuned, and the lock is still good... */ + if (s & FE_HAS_LOCK) + continue; + else { + /* if we _WERE_ tuned, but now don't have a lock, + * need to zigzag */ + fepriv->state = FESTATE_ZIGZAG_FAST; + fepriv->started_auto_step = fepriv->auto_step; + 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)) { + update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK); + continue; + } + + /* 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) { + update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK); + continue; + } + + /* 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; + check_wrapped = 0; + } + + /* fast zigzag. */ + if ((fepriv->state & FESTATE_SEARCHING_FAST) || (fepriv->state & FESTATE_RETUNE)) { + delay = fepriv->min_delay; + + /* peform a tune */ + if (dvb_frontend_autotune(fe, check_wrapped)) { + /* 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; + continue; + } + 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) { + update_delay(&quality, &delay, fepriv->min_delay, s & FE_HAS_LOCK); + + /* Note: don't bother checking for wrapping; we stay in this + * state until we get a lock */ + dvb_frontend_autotune(fe, 0); + } + } + + if (dvb_shutdown_timeout) { + if (dvb_powerdown_on_sleep) + if (fe->ops->set_voltage) + fe->ops->set_voltage(fe, SEC_VOLTAGE_OFF); + if (fe->ops->sleep) + fe->ops->sleep(fe); + } + + fepriv->thread_pid = 0; + mb(); + + dvb_frontend_wakeup(fe); + return 0; +} + +static void dvb_frontend_stop(struct dvb_frontend *fe) +{ + unsigned long ret; + struct dvb_frontend_private *fepriv = (struct dvb_frontend_private*) fe->frontend_priv; + + dprintk ("%s\n", __FUNCTION__); + + fepriv->exit = 1; + mb(); + + if (!fepriv->thread_pid) + return; + + /* check if the thread is really alive */ + if (kill_proc(fepriv->thread_pid, 0, 1) == -ESRCH) { + printk("dvb_frontend_stop: thread PID %d already died\n", + fepriv->thread_pid); + /* make sure the mutex was not held by the thread */ + init_MUTEX (&fepriv->sem); + return; + } + + /* wake up the frontend thread, so it notices that fe->exit == 1 */ + dvb_frontend_wakeup(fe); + + /* wait until the frontend thread has exited */ + ret = wait_event_interruptible(fepriv->wait_queue,0 == fepriv->thread_pid); + if (-ERESTARTSYS != ret) { + fepriv->state = FESTATE_IDLE; + return; + } + fepriv->state = FESTATE_IDLE; + + /* paranoia check in case a signal arrived */ + if (fepriv->thread_pid) + printk("dvb_frontend_stop: warning: thread PID %d won't exit\n", + fepriv->thread_pid); +} + +static int dvb_frontend_start(struct dvb_frontend *fe) +{ + int ret; + struct dvb_frontend_private *fepriv = (struct dvb_frontend_private*) fe->frontend_priv; + + dprintk ("%s\n", __FUNCTION__); + + if (fepriv->thread_pid) { + if (!fepriv->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 = 0; + fepriv->thread_pid = 0; + mb(); + + ret = kernel_thread (dvb_frontend_thread, fe, 0); + + if (ret < 0) { + printk("dvb_frontend_start: failed to start kernel_thread (%d)\n", ret); + up(&fepriv->sem); + return ret; + } + fepriv->thread_pid = ret; + + return 0; +} + +static int dvb_frontend_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, void *parg) +{ + struct dvb_device *dvbdev = file->private_data; + struct dvb_frontend *fe = dvbdev->priv; + struct dvb_frontend_private *fepriv = (struct dvb_frontend_private*) fe->frontend_priv; + int err = -EOPNOTSUPP; + + dprintk ("%s\n", __FUNCTION__); + + if (!fe || fepriv->exit) + return -ENODEV; + + if ((file->f_flags & O_ACCMODE) == O_RDONLY && + (_IOC_DIR(cmd) != _IOC_READ || cmd == FE_GET_EVENT || + cmd == FE_DISEQC_RECV_SLAVE_REPLY)) + return -EPERM; + + if (down_interruptible (&fepriv->sem)) + return -ERESTARTSYS; + + switch (cmd) { + case FE_GET_INFO: { + struct dvb_frontend_info* info = (struct dvb_frontend_info*) parg; + memcpy(info, &fe->ops->info, sizeof(struct dvb_frontend_info)); + + /* Force the CAN_INVERSION_AUTO bit on. If the frontend doesn't + * do it, it is done for it. */ + info->caps |= FE_CAN_INVERSION_AUTO; + err = 0; + break; + } + + case FE_READ_STATUS: + if (fe->ops->read_status) + err = fe->ops->read_status(fe, (fe_status_t*) parg); + break; + + case FE_READ_BER: + if (fe->ops->read_ber) + err = fe->ops->read_ber(fe, (__u32*) parg); + break; + + case FE_READ_SIGNAL_STRENGTH: + if (fe->ops->read_signal_strength) + err = fe->ops->read_signal_strength(fe, (__u16*) parg); + break; + + case FE_READ_SNR: + if (fe->ops->read_snr) + err = fe->ops->read_snr(fe, (__u16*) parg); + break; + + case FE_READ_UNCORRECTED_BLOCKS: + if (fe->ops->read_ucblocks) + err = fe->ops->read_ucblocks(fe, (__u32*) parg); + break; + + + case FE_DISEQC_RESET_OVERLOAD: + if (fe->ops->diseqc_reset_overload) { + err = fe->ops->diseqc_reset_overload(fe); + fepriv->state = FESTATE_DISEQC; + fepriv->status = 0; + } + break; + + case FE_DISEQC_SEND_MASTER_CMD: + if (fe->ops->diseqc_send_master_cmd) { + err = fe->ops->diseqc_send_master_cmd(fe, (struct dvb_diseqc_master_cmd*) parg); + fepriv->state = FESTATE_DISEQC; + fepriv->status = 0; + } + break; + + case FE_DISEQC_SEND_BURST: + if (fe->ops->diseqc_send_burst) { + err = fe->ops->diseqc_send_burst(fe, (fe_sec_mini_cmd_t) parg); + fepriv->state = FESTATE_DISEQC; + fepriv->status = 0; + } + break; + + case FE_SET_TONE: + if (fe->ops->set_tone) { + err = fe->ops->set_tone(fe, (fe_sec_tone_mode_t) parg); + fepriv->state = FESTATE_DISEQC; + fepriv->status = 0; + } + break; + + case FE_SET_VOLTAGE: + if (fe->ops->set_voltage) { + err = fe->ops->set_voltage(fe, (fe_sec_voltage_t) parg); + fepriv->state = FESTATE_DISEQC; + fepriv->status = 0; + } + break; + + case FE_DISHNETWORK_SEND_LEGACY_CMD: + if (fe->ops->dishnetwork_send_legacy_command) { + err = fe->ops->dishnetwork_send_legacy_command(fe, (unsigned int) parg); + fepriv->state = FESTATE_DISEQC; + fepriv->status = 0; + } + break; + + case FE_DISEQC_RECV_SLAVE_REPLY: + if (fe->ops->diseqc_recv_slave_reply) + err = fe->ops->diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg); + break; + + case FE_ENABLE_HIGH_LNB_VOLTAGE: + if (fe->ops->enable_high_lnb_voltage) + err = fe->ops->enable_high_lnb_voltage(fe, (int) parg); + break; + + case FE_SET_FRONTEND: { + struct dvb_frontend_tune_settings fetunesettings; + + memcpy (&fepriv->parameters, parg, + sizeof (struct dvb_frontend_parameters)); + + memset(&fetunesettings, 0, sizeof(struct dvb_frontend_tune_settings)); + memcpy(&fetunesettings.parameters, parg, + sizeof (struct dvb_frontend_parameters)); + + /* force auto frequency inversion if requested */ + if (dvb_force_auto_inversion) { + fepriv->parameters.inversion = INVERSION_AUTO; + fetunesettings.parameters.inversion = INVERSION_AUTO; + } + if (fe->ops->info.type == FE_OFDM) { + /* without hierachical coding code_rate_LP is irrelevant, + * so we tolerate the otherwise invalid FEC_NONE setting */ + if (fepriv->parameters.u.ofdm.hierarchy_information == HIERARCHY_NONE && + fepriv->parameters.u.ofdm.code_rate_LP == FEC_NONE) + fepriv->parameters.u.ofdm.code_rate_LP = FEC_AUTO; + } + + /* get frontend-specific tuning settings */ + if (fe->ops->get_tune_settings && (fe->ops->get_tune_settings(fe, &fetunesettings) == 0)) { + fepriv->min_delay = (fetunesettings.min_delay_ms * HZ) / 1000; + fepriv->max_drift = fetunesettings.max_drift; + fepriv->step_size = fetunesettings.step_size; + } else { + /* default values */ + switch(fe->ops->info.type) { + case FE_QPSK: + fepriv->min_delay = HZ/20; + fepriv->step_size = fepriv->parameters.u.qpsk.symbol_rate / 16000; + fepriv->max_drift = fepriv->parameters.u.qpsk.symbol_rate / 2000; + break; + + case FE_QAM: + fepriv->min_delay = HZ/20; + fepriv->step_size = 0; /* no zigzag */ + fepriv->max_drift = 0; + break; + + case FE_OFDM: + fepriv->min_delay = HZ/20; + fepriv->step_size = fe->ops->info.frequency_stepsize * 2; + fepriv->max_drift = (fe->ops->info.frequency_stepsize * 2) + 1; + break; + case FE_ATSC: + printk("dvb-core: FE_ATSC not handled yet.\n"); + break; + } + } + if (dvb_override_tune_delay > 0) + fepriv->min_delay = (dvb_override_tune_delay * HZ) / 1000; + + fepriv->state = FESTATE_RETUNE; + dvb_frontend_wakeup(fe); + dvb_frontend_add_event(fe, 0); + fepriv->status = 0; + err = 0; + break; + } + + case FE_GET_EVENT: + err = dvb_frontend_get_event (fe, parg, file->f_flags); + break; + + case FE_GET_FRONTEND: + if (fe->ops->get_frontend) { + memcpy (parg, &fepriv->parameters, sizeof (struct dvb_frontend_parameters)); + err = fe->ops->get_frontend(fe, (struct dvb_frontend_parameters*) parg); + } + break; + }; + + up (&fepriv->sem); + return err; +} + +static unsigned int dvb_frontend_poll(struct file *file, struct poll_table_struct *wait) +{ + struct dvb_device *dvbdev = file->private_data; + struct dvb_frontend *fe = dvbdev->priv; + struct dvb_frontend_private *fepriv = (struct dvb_frontend_private*) fe->frontend_priv; + + dprintk ("%s\n", __FUNCTION__); + + poll_wait (file, &fepriv->events.wait_queue, wait); + + if (fepriv->events.eventw != fepriv->events.eventr) + return (POLLIN | POLLRDNORM | POLLPRI); + + return 0; +} + +static int dvb_frontend_open(struct inode *inode, struct file *file) +{ + struct dvb_device *dvbdev = file->private_data; + struct dvb_frontend *fe = dvbdev->priv; + struct dvb_frontend_private *fepriv = (struct dvb_frontend_private*) fe->frontend_priv; + int ret; + + dprintk ("%s\n", __FUNCTION__); + + if ((ret = dvb_generic_open (inode, file)) < 0) + return ret; + + if ((file->f_flags & O_ACCMODE) != O_RDONLY) { + ret = dvb_frontend_start (fe); + if (ret) + dvb_generic_release (inode, file); + + /* empty event queue */ + fepriv->events.eventr = fepriv->events.eventw = 0; + } + + return ret; +} + +static int dvb_frontend_release(struct inode *inode, struct file *file) +{ + struct dvb_device *dvbdev = file->private_data; + struct dvb_frontend *fe = dvbdev->priv; + struct dvb_frontend_private *fepriv = (struct dvb_frontend_private*) fe->frontend_priv; + + dprintk ("%s\n", __FUNCTION__); + + if ((file->f_flags & O_ACCMODE) != O_RDONLY) + fepriv->release_jiffies = jiffies; + + return dvb_generic_release (inode, file); +} + +static struct file_operations dvb_frontend_fops = { + .owner = THIS_MODULE, + .ioctl = dvb_generic_ioctl, + .poll = dvb_frontend_poll, + .open = dvb_frontend_open, + .release = dvb_frontend_release +}; + +int dvb_register_frontend(struct dvb_adapter* dvb, + struct dvb_frontend* fe) +{ + struct dvb_frontend_private *fepriv; + static const struct dvb_device dvbdev_template = { + .users = ~0, + .writers = 1, + .readers = (~0)-1, + .fops = &dvb_frontend_fops, + .kernel_ioctl = dvb_frontend_ioctl + }; + + dprintk ("%s\n", __FUNCTION__); + + if (down_interruptible (&frontend_mutex)) + return -ERESTARTSYS; + + fe->frontend_priv = kmalloc(sizeof(struct dvb_frontend_private), GFP_KERNEL); + if (fe->frontend_priv == NULL) { + up(&frontend_mutex); + return -ENOMEM; + } + fepriv = (struct dvb_frontend_private*) fe->frontend_priv; + memset(fe->frontend_priv, 0, sizeof(struct dvb_frontend_private)); + + init_MUTEX (&fepriv->sem); + init_waitqueue_head (&fepriv->wait_queue); + init_waitqueue_head (&fepriv->events.wait_queue); + init_MUTEX (&fepriv->events.sem); + fe->dvb = dvb; + fepriv->inversion = INVERSION_OFF; + + printk ("DVB: registering frontend %i (%s)...\n", + fe->dvb->num, + fe->ops->info.name); + + dvb_register_device (fe->dvb, &fepriv->dvbdev, &dvbdev_template, + fe, DVB_DEVICE_FRONTEND); + + up (&frontend_mutex); + return 0; +} +EXPORT_SYMBOL(dvb_register_frontend); + +int dvb_unregister_frontend(struct dvb_frontend* fe) +{ + struct dvb_frontend_private *fepriv = (struct dvb_frontend_private*) fe->frontend_priv; + dprintk ("%s\n", __FUNCTION__); + + down (&frontend_mutex); + dvb_unregister_device (fepriv->dvbdev); + dvb_frontend_stop (fe); + if (fe->ops->release) + fe->ops->release(fe); + else + printk("dvb_frontend: Demodulator (%s) does not have a release callback!\n", fe->ops->info.name); + /* fe is invalid now */ + kfree(fepriv); + up (&frontend_mutex); + return 0; +} +EXPORT_SYMBOL(dvb_unregister_frontend); |