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kernel/drivers/media/radio/radio-si476x.c

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/*
* drivers/media/radio/radio-si476x.c -- V4L2 driver for SI476X chips
*
* Copyright (C) 2012 Innovative Converged Devices(ICD)
* Copyright (C) 2013 Andrey Smirnov
*
* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
*
* 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; version 2 of the License.
*
* 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.
*
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/atomic.h>
#include <linux/videodev2.h>
#include <linux/mutex.h>
#include <linux/debugfs.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/v4l2-device.h>
#include <media/drv-intf/si476x.h>
#include <linux/mfd/si476x-core.h>
#define FM_FREQ_RANGE_LOW 64000000
#define FM_FREQ_RANGE_HIGH 108000000
#define AM_FREQ_RANGE_LOW 520000
#define AM_FREQ_RANGE_HIGH 30000000
#define PWRLINEFLTR (1 << 8)
#define FREQ_MUL (10000000 / 625)
#define SI476X_PHDIV_STATUS_LINK_LOCKED(status) (0x80 & (status))
#define DRIVER_NAME "si476x-radio"
#define DRIVER_CARD "SI476x AM/FM Receiver"
enum si476x_freq_bands {
SI476X_BAND_FM,
SI476X_BAND_AM,
};
static const struct v4l2_frequency_band si476x_bands[] = {
[SI476X_BAND_FM] = {
.type = V4L2_TUNER_RADIO,
.index = SI476X_BAND_FM,
.capability = V4L2_TUNER_CAP_LOW
| V4L2_TUNER_CAP_STEREO
| V4L2_TUNER_CAP_RDS
| V4L2_TUNER_CAP_RDS_BLOCK_IO
| V4L2_TUNER_CAP_FREQ_BANDS,
.rangelow = 64 * FREQ_MUL,
.rangehigh = 108 * FREQ_MUL,
.modulation = V4L2_BAND_MODULATION_FM,
},
[SI476X_BAND_AM] = {
.type = V4L2_TUNER_RADIO,
.index = SI476X_BAND_AM,
.capability = V4L2_TUNER_CAP_LOW
| V4L2_TUNER_CAP_FREQ_BANDS,
.rangelow = 0.52 * FREQ_MUL,
.rangehigh = 30 * FREQ_MUL,
.modulation = V4L2_BAND_MODULATION_AM,
},
};
static inline bool si476x_radio_freq_is_inside_of_the_band(u32 freq, int band)
{
return freq >= si476x_bands[band].rangelow &&
freq <= si476x_bands[band].rangehigh;
}
static inline bool si476x_radio_range_is_inside_of_the_band(u32 low, u32 high,
int band)
{
return low >= si476x_bands[band].rangelow &&
high <= si476x_bands[band].rangehigh;
}
static int si476x_radio_s_ctrl(struct v4l2_ctrl *ctrl);
static int si476x_radio_g_volatile_ctrl(struct v4l2_ctrl *ctrl);
enum phase_diversity_modes_idx {
SI476X_IDX_PHDIV_DISABLED,
SI476X_IDX_PHDIV_PRIMARY_COMBINING,
SI476X_IDX_PHDIV_PRIMARY_ANTENNA,
SI476X_IDX_PHDIV_SECONDARY_ANTENNA,
SI476X_IDX_PHDIV_SECONDARY_COMBINING,
};
static const char * const phase_diversity_modes[] = {
[SI476X_IDX_PHDIV_DISABLED] = "Disabled",
[SI476X_IDX_PHDIV_PRIMARY_COMBINING] = "Primary with Secondary",
[SI476X_IDX_PHDIV_PRIMARY_ANTENNA] = "Primary Antenna",
[SI476X_IDX_PHDIV_SECONDARY_ANTENNA] = "Secondary Antenna",
[SI476X_IDX_PHDIV_SECONDARY_COMBINING] = "Secondary with Primary",
};
static inline enum phase_diversity_modes_idx
si476x_phase_diversity_mode_to_idx(enum si476x_phase_diversity_mode mode)
{
switch (mode) {
default: /* FALLTHROUGH */
case SI476X_PHDIV_DISABLED:
return SI476X_IDX_PHDIV_DISABLED;
case SI476X_PHDIV_PRIMARY_COMBINING:
return SI476X_IDX_PHDIV_PRIMARY_COMBINING;
case SI476X_PHDIV_PRIMARY_ANTENNA:
return SI476X_IDX_PHDIV_PRIMARY_ANTENNA;
case SI476X_PHDIV_SECONDARY_ANTENNA:
return SI476X_IDX_PHDIV_SECONDARY_ANTENNA;
case SI476X_PHDIV_SECONDARY_COMBINING:
return SI476X_IDX_PHDIV_SECONDARY_COMBINING;
}
}
static inline enum si476x_phase_diversity_mode
si476x_phase_diversity_idx_to_mode(enum phase_diversity_modes_idx idx)
{
static const int idx_to_value[] = {
[SI476X_IDX_PHDIV_DISABLED] = SI476X_PHDIV_DISABLED,
[SI476X_IDX_PHDIV_PRIMARY_COMBINING] = SI476X_PHDIV_PRIMARY_COMBINING,
[SI476X_IDX_PHDIV_PRIMARY_ANTENNA] = SI476X_PHDIV_PRIMARY_ANTENNA,
[SI476X_IDX_PHDIV_SECONDARY_ANTENNA] = SI476X_PHDIV_SECONDARY_ANTENNA,
[SI476X_IDX_PHDIV_SECONDARY_COMBINING] = SI476X_PHDIV_SECONDARY_COMBINING,
};
return idx_to_value[idx];
}
static const struct v4l2_ctrl_ops si476x_ctrl_ops = {
.g_volatile_ctrl = si476x_radio_g_volatile_ctrl,
.s_ctrl = si476x_radio_s_ctrl,
};
enum si476x_ctrl_idx {
SI476X_IDX_RSSI_THRESHOLD,
SI476X_IDX_SNR_THRESHOLD,
SI476X_IDX_MAX_TUNE_ERROR,
SI476X_IDX_HARMONICS_COUNT,
SI476X_IDX_DIVERSITY_MODE,
SI476X_IDX_INTERCHIP_LINK,
};
static struct v4l2_ctrl_config si476x_ctrls[] = {
/*
* SI476X during its station seeking(or tuning) process uses several
* parameters to detrmine if "the station" is valid:
*
* - Signal's SNR(in dBuV) must be lower than
* #V4L2_CID_SI476X_SNR_THRESHOLD
* - Signal's RSSI(in dBuV) must be greater than
* #V4L2_CID_SI476X_RSSI_THRESHOLD
* - Signal's frequency deviation(in units of 2ppm) must not be
* more than #V4L2_CID_SI476X_MAX_TUNE_ERROR
*/
[SI476X_IDX_RSSI_THRESHOLD] = {
.ops = &si476x_ctrl_ops,
.id = V4L2_CID_SI476X_RSSI_THRESHOLD,
.name = "Valid RSSI Threshold",
.type = V4L2_CTRL_TYPE_INTEGER,
.min = -128,
.max = 127,
.step = 1,
},
[SI476X_IDX_SNR_THRESHOLD] = {
.ops = &si476x_ctrl_ops,
.id = V4L2_CID_SI476X_SNR_THRESHOLD,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Valid SNR Threshold",
.min = -128,
.max = 127,
.step = 1,
},
[SI476X_IDX_MAX_TUNE_ERROR] = {
.ops = &si476x_ctrl_ops,
.id = V4L2_CID_SI476X_MAX_TUNE_ERROR,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Max Tune Errors",
.min = 0,
.max = 126 * 2,
.step = 2,
},
/*
* #V4L2_CID_SI476X_HARMONICS_COUNT -- number of harmonics
* built-in power-line noise supression filter is to reject
* during AM-mode operation.
*/
[SI476X_IDX_HARMONICS_COUNT] = {
.ops = &si476x_ctrl_ops,
.id = V4L2_CID_SI476X_HARMONICS_COUNT,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Count of Harmonics to Reject",
.min = 0,
.max = 20,
.step = 1,
},
/*
* #V4L2_CID_SI476X_DIVERSITY_MODE -- configuration which
* two tuners working in diversity mode are to work in.
*
* - #SI476X_IDX_PHDIV_DISABLED diversity mode disabled
* - #SI476X_IDX_PHDIV_PRIMARY_COMBINING diversity mode is
* on, primary tuner's antenna is the main one.
* - #SI476X_IDX_PHDIV_PRIMARY_ANTENNA diversity mode is
* off, primary tuner's antenna is the main one.
* - #SI476X_IDX_PHDIV_SECONDARY_ANTENNA diversity mode is
* off, secondary tuner's antenna is the main one.
* - #SI476X_IDX_PHDIV_SECONDARY_COMBINING diversity mode is
* on, secondary tuner's antenna is the main one.
*/
[SI476X_IDX_DIVERSITY_MODE] = {
.ops = &si476x_ctrl_ops,
.id = V4L2_CID_SI476X_DIVERSITY_MODE,
.type = V4L2_CTRL_TYPE_MENU,
.name = "Phase Diversity Mode",
.qmenu = phase_diversity_modes,
.min = 0,
.max = ARRAY_SIZE(phase_diversity_modes) - 1,
},
/*
* #V4L2_CID_SI476X_INTERCHIP_LINK -- inter-chip link in
* diversity mode indicator. Allows user to determine if two
* chips working in diversity mode have established a link
* between each other and if the system as a whole uses
* signals from both antennas to receive FM radio.
*/
[SI476X_IDX_INTERCHIP_LINK] = {
.ops = &si476x_ctrl_ops,
.id = V4L2_CID_SI476X_INTERCHIP_LINK,
.type = V4L2_CTRL_TYPE_BOOLEAN,
.flags = V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_VOLATILE,
.name = "Inter-Chip Link",
.min = 0,
.max = 1,
.step = 1,
},
};
struct si476x_radio;
/**
* struct si476x_radio_ops - vtable of tuner functions
*
* This table holds pointers to functions implementing particular
* operations depending on the mode in which the tuner chip was
* configured to start in. If the function is not supported
* corresponding element is set to #NULL.
*
* @tune_freq: Tune chip to a specific frequency
* @seek_start: Star station seeking
* @rsq_status: Get Received Signal Quality(RSQ) status
* @rds_blckcnt: Get received RDS blocks count
* @phase_diversity: Change phase diversity mode of the tuner
* @phase_div_status: Get phase diversity mode status
* @acf_status: Get the status of Automatically Controlled
* Features(ACF)
* @agc_status: Get Automatic Gain Control(AGC) status
*/
struct si476x_radio_ops {
int (*tune_freq)(struct si476x_core *, struct si476x_tune_freq_args *);
int (*seek_start)(struct si476x_core *, bool, bool);
int (*rsq_status)(struct si476x_core *, struct si476x_rsq_status_args *,
struct si476x_rsq_status_report *);
int (*rds_blckcnt)(struct si476x_core *, bool,
struct si476x_rds_blockcount_report *);
int (*phase_diversity)(struct si476x_core *,
enum si476x_phase_diversity_mode);
int (*phase_div_status)(struct si476x_core *);
int (*acf_status)(struct si476x_core *,
struct si476x_acf_status_report *);
int (*agc_status)(struct si476x_core *,
struct si476x_agc_status_report *);
};
/**
* struct si476x_radio - radio device
*
* @v4l2dev: Pointer to V4L2 device created by V4L2 subsystem
* @videodev: Pointer to video device created by V4L2 subsystem
* @ctrl_handler: V4L2 controls handler
* @core: Pointer to underlying core device
* @ops: Vtable of functions. See struct si476x_radio_ops for details
* @debugfs: pointer to &strucd dentry for debugfs
* @audmode: audio mode, as defined for the rxsubchans field
* at videodev2.h
*
* core structure is the radio device is being used
*/
struct si476x_radio {
struct v4l2_device v4l2dev;
struct video_device videodev;
struct v4l2_ctrl_handler ctrl_handler;
struct si476x_core *core;
/* This field should not be accesses unless core lock is held */
const struct si476x_radio_ops *ops;
struct dentry *debugfs;
u32 audmode;
};
static inline struct si476x_radio *
v4l2_dev_to_radio(struct v4l2_device *d)
{
return container_of(d, struct si476x_radio, v4l2dev);
}
static inline struct si476x_radio *
v4l2_ctrl_handler_to_radio(struct v4l2_ctrl_handler *d)
{
return container_of(d, struct si476x_radio, ctrl_handler);
}
/*
* si476x_vidioc_querycap - query device capabilities
*/
static int si476x_radio_querycap(struct file *file, void *priv,
struct v4l2_capability *capability)
{
struct si476x_radio *radio = video_drvdata(file);
strscpy(capability->driver, radio->v4l2dev.name,
sizeof(capability->driver));
strscpy(capability->card, DRIVER_CARD, sizeof(capability->card));
snprintf(capability->bus_info, sizeof(capability->bus_info),
"platform:%s", radio->v4l2dev.name);
capability->device_caps = V4L2_CAP_TUNER
| V4L2_CAP_RADIO
| V4L2_CAP_HW_FREQ_SEEK;
si476x_core_lock(radio->core);
if (!si476x_core_is_a_secondary_tuner(radio->core))
capability->device_caps |= V4L2_CAP_RDS_CAPTURE
| V4L2_CAP_READWRITE;
si476x_core_unlock(radio->core);
capability->capabilities = capability->device_caps
| V4L2_CAP_DEVICE_CAPS;
return 0;
}
static int si476x_radio_enum_freq_bands(struct file *file, void *priv,
struct v4l2_frequency_band *band)
{
int err;
struct si476x_radio *radio = video_drvdata(file);
if (band->tuner != 0)
return -EINVAL;
switch (radio->core->chip_id) {
/* AM/FM tuners -- all bands are supported */
case SI476X_CHIP_SI4761:
case SI476X_CHIP_SI4764:
if (band->index < ARRAY_SIZE(si476x_bands)) {
*band = si476x_bands[band->index];
err = 0;
} else {
err = -EINVAL;
}
break;
/* FM companion tuner chips -- only FM bands are
* supported */
case SI476X_CHIP_SI4768:
if (band->index == SI476X_BAND_FM) {
*band = si476x_bands[band->index];
err = 0;
} else {
err = -EINVAL;
}
break;
default:
err = -EINVAL;
}
return err;
}
static int si476x_radio_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *tuner)
{
int err;
struct si476x_rsq_status_report report;
struct si476x_radio *radio = video_drvdata(file);
struct si476x_rsq_status_args args = {
.primary = false,
.rsqack = false,
.attune = false,
.cancel = false,
.stcack = false,
};
if (tuner->index != 0)
return -EINVAL;
tuner->type = V4L2_TUNER_RADIO;
tuner->capability = V4L2_TUNER_CAP_LOW /* Measure frequencies
* in multiples of
* 62.5 Hz */
| V4L2_TUNER_CAP_STEREO
| V4L2_TUNER_CAP_HWSEEK_BOUNDED
| V4L2_TUNER_CAP_HWSEEK_WRAP
| V4L2_TUNER_CAP_HWSEEK_PROG_LIM;
si476x_core_lock(radio->core);
if (si476x_core_is_a_secondary_tuner(radio->core)) {
strscpy(tuner->name, "FM (secondary)", sizeof(tuner->name));
tuner->rxsubchans = 0;
tuner->rangelow = si476x_bands[SI476X_BAND_FM].rangelow;
} else if (si476x_core_has_am(radio->core)) {
if (si476x_core_is_a_primary_tuner(radio->core))
strscpy(tuner->name, "AM/FM (primary)",
sizeof(tuner->name));
else
strscpy(tuner->name, "AM/FM", sizeof(tuner->name));
tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO
| V4L2_TUNER_SUB_RDS;
tuner->capability |= V4L2_TUNER_CAP_RDS
| V4L2_TUNER_CAP_RDS_BLOCK_IO
| V4L2_TUNER_CAP_FREQ_BANDS;
tuner->rangelow = si476x_bands[SI476X_BAND_AM].rangelow;
} else {
strscpy(tuner->name, "FM", sizeof(tuner->name));
tuner->rxsubchans = V4L2_TUNER_SUB_RDS;
tuner->capability |= V4L2_TUNER_CAP_RDS
| V4L2_TUNER_CAP_RDS_BLOCK_IO
| V4L2_TUNER_CAP_FREQ_BANDS;
tuner->rangelow = si476x_bands[SI476X_BAND_FM].rangelow;
}
tuner->audmode = radio->audmode;
tuner->afc = 1;
tuner->rangehigh = si476x_bands[SI476X_BAND_FM].rangehigh;
err = radio->ops->rsq_status(radio->core,
&args, &report);
if (err < 0) {
tuner->signal = 0;
} else {
/*
* tuner->signal value range: 0x0000 .. 0xFFFF,
* report.rssi: -128 .. 127
*/
tuner->signal = (report.rssi + 128) * 257;
}
si476x_core_unlock(radio->core);
return err;
}
static int si476x_radio_s_tuner(struct file *file, void *priv,
const struct v4l2_tuner *tuner)
{
struct si476x_radio *radio = video_drvdata(file);
if (tuner->index != 0)
return -EINVAL;
if (tuner->audmode == V4L2_TUNER_MODE_MONO ||
tuner->audmode == V4L2_TUNER_MODE_STEREO)
radio->audmode = tuner->audmode;
else
radio->audmode = V4L2_TUNER_MODE_STEREO;
return 0;
}
static int si476x_radio_init_vtable(struct si476x_radio *radio,
enum si476x_func func)
{
static const struct si476x_radio_ops fm_ops = {
.tune_freq = si476x_core_cmd_fm_tune_freq,
.seek_start = si476x_core_cmd_fm_seek_start,
.rsq_status = si476x_core_cmd_fm_rsq_status,
.rds_blckcnt = si476x_core_cmd_fm_rds_blockcount,
.phase_diversity = si476x_core_cmd_fm_phase_diversity,
.phase_div_status = si476x_core_cmd_fm_phase_div_status,
.acf_status = si476x_core_cmd_fm_acf_status,
.agc_status = si476x_core_cmd_agc_status,
};
static const struct si476x_radio_ops am_ops = {
.tune_freq = si476x_core_cmd_am_tune_freq,
.seek_start = si476x_core_cmd_am_seek_start,
.rsq_status = si476x_core_cmd_am_rsq_status,
.rds_blckcnt = NULL,
.phase_diversity = NULL,
.phase_div_status = NULL,
.acf_status = si476x_core_cmd_am_acf_status,
.agc_status = NULL,
};
switch (func) {
case SI476X_FUNC_FM_RECEIVER:
radio->ops = &fm_ops;
return 0;
case SI476X_FUNC_AM_RECEIVER:
radio->ops = &am_ops;
return 0;
default:
WARN(1, "Unexpected tuner function value\n");
return -EINVAL;
}
}
static int si476x_radio_pretune(struct si476x_radio *radio,
enum si476x_func func)
{
int retval;
struct si476x_tune_freq_args args = {
.zifsr = false,
.hd = false,
.injside = SI476X_INJSIDE_AUTO,
.tunemode = SI476X_TM_VALIDATED_NORMAL_TUNE,
.smoothmetrics = SI476X_SM_INITIALIZE_AUDIO,
.antcap = 0,
};
switch (func) {
case SI476X_FUNC_FM_RECEIVER:
args.freq = v4l2_to_si476x(radio->core,
92 * FREQ_MUL);
retval = radio->ops->tune_freq(radio->core, &args);
break;
case SI476X_FUNC_AM_RECEIVER:
args.freq = v4l2_to_si476x(radio->core,
0.6 * FREQ_MUL);
retval = radio->ops->tune_freq(radio->core, &args);
break;
default:
WARN(1, "Unexpected tuner function value\n");
retval = -EINVAL;
}
return retval;
}
static int si476x_radio_do_post_powerup_init(struct si476x_radio *radio,
enum si476x_func func)
{
int err;
/* regcache_mark_dirty(radio->core->regmap); */
err = regcache_sync_region(radio->core->regmap,
SI476X_PROP_DIGITAL_IO_INPUT_SAMPLE_RATE,
SI476X_PROP_DIGITAL_IO_OUTPUT_FORMAT);
if (err < 0)
return err;
err = regcache_sync_region(radio->core->regmap,
SI476X_PROP_AUDIO_DEEMPHASIS,
SI476X_PROP_AUDIO_PWR_LINE_FILTER);
if (err < 0)
return err;
err = regcache_sync_region(radio->core->regmap,
SI476X_PROP_INT_CTL_ENABLE,
SI476X_PROP_INT_CTL_ENABLE);
if (err < 0)
return err;
/*
* Is there any point in restoring SNR and the like
* when switching between AM/FM?
*/
err = regcache_sync_region(radio->core->regmap,
SI476X_PROP_VALID_MAX_TUNE_ERROR,
SI476X_PROP_VALID_MAX_TUNE_ERROR);
if (err < 0)
return err;
err = regcache_sync_region(radio->core->regmap,
SI476X_PROP_VALID_SNR_THRESHOLD,
SI476X_PROP_VALID_RSSI_THRESHOLD);
if (err < 0)
return err;
if (func == SI476X_FUNC_FM_RECEIVER) {
if (si476x_core_has_diversity(radio->core)) {
err = si476x_core_cmd_fm_phase_diversity(radio->core,
radio->core->diversity_mode);
if (err < 0)
return err;
}
err = regcache_sync_region(radio->core->regmap,
SI476X_PROP_FM_RDS_INTERRUPT_SOURCE,
SI476X_PROP_FM_RDS_CONFIG);
if (err < 0)
return err;
}
return si476x_radio_init_vtable(radio, func);
}
static int si476x_radio_change_func(struct si476x_radio *radio,
enum si476x_func func)
{
int err;
bool soft;
/*
* Since power/up down is a very time consuming operation,
* try to avoid doing it if the requested mode matches the one
* the tuner is in
*/
if (func == radio->core->power_up_parameters.func)
return 0;
soft = true;
err = si476x_core_stop(radio->core, soft);
if (err < 0) {
/*
* OK, if the chip does not want to play nice let's
* try to reset it in more brutal way
*/
soft = false;
err = si476x_core_stop(radio->core, soft);
if (err < 0)
return err;
}
/*
Set the desired radio tuner function
*/
radio->core->power_up_parameters.func = func;
err = si476x_core_start(radio->core, soft);
if (err < 0)
return err;
/*
* No need to do the rest of manipulations for the bootlader
* mode
*/
if (func != SI476X_FUNC_FM_RECEIVER &&
func != SI476X_FUNC_AM_RECEIVER)
return err;
return si476x_radio_do_post_powerup_init(radio, func);
}
static int si476x_radio_g_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
int err;
struct si476x_radio *radio = video_drvdata(file);
if (f->tuner != 0 ||
f->type != V4L2_TUNER_RADIO)
return -EINVAL;
si476x_core_lock(radio->core);
if (radio->ops->rsq_status) {
struct si476x_rsq_status_report report;
struct si476x_rsq_status_args args = {
.primary = false,
.rsqack = false,
.attune = true,
.cancel = false,
.stcack = false,
};
err = radio->ops->rsq_status(radio->core, &args, &report);
if (!err)
f->frequency = si476x_to_v4l2(radio->core,
report.readfreq);
} else {
err = -EINVAL;
}
si476x_core_unlock(radio->core);
return err;
}
static int si476x_radio_s_frequency(struct file *file, void *priv,
const struct v4l2_frequency *f)
{
int err;
u32 freq = f->frequency;
struct si476x_tune_freq_args args;
struct si476x_radio *radio = video_drvdata(file);
const u32 midrange = (si476x_bands[SI476X_BAND_AM].rangehigh +
si476x_bands[SI476X_BAND_FM].rangelow) / 2;
const int band = (freq > midrange) ?
SI476X_BAND_FM : SI476X_BAND_AM;
const enum si476x_func func = (band == SI476X_BAND_AM) ?
SI476X_FUNC_AM_RECEIVER : SI476X_FUNC_FM_RECEIVER;
if (f->tuner != 0 ||
f->type != V4L2_TUNER_RADIO)
return -EINVAL;
si476x_core_lock(radio->core);
freq = clamp(freq,
si476x_bands[band].rangelow,
si476x_bands[band].rangehigh);
if (si476x_radio_freq_is_inside_of_the_band(freq,
SI476X_BAND_AM) &&
(!si476x_core_has_am(radio->core) ||
si476x_core_is_a_secondary_tuner(radio->core))) {
err = -EINVAL;
goto unlock;
}
err = si476x_radio_change_func(radio, func);
if (err < 0)
goto unlock;
args.zifsr = false;
args.hd = false;
args.injside = SI476X_INJSIDE_AUTO;
args.freq = v4l2_to_si476x(radio->core, freq);
args.tunemode = SI476X_TM_VALIDATED_NORMAL_TUNE;
args.smoothmetrics = SI476X_SM_INITIALIZE_AUDIO;
args.antcap = 0;
err = radio->ops->tune_freq(radio->core, &args);
unlock:
si476x_core_unlock(radio->core);
return err;
}
static int si476x_radio_s_hw_freq_seek(struct file *file, void *priv,
const struct v4l2_hw_freq_seek *seek)
{
int err;
enum si476x_func func;
u32 rangelow = seek->rangelow, rangehigh = seek->rangehigh;
struct si476x_radio *radio = video_drvdata(file);
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
if (seek->tuner != 0 ||
seek->type != V4L2_TUNER_RADIO)
return -EINVAL;
si476x_core_lock(radio->core);
if (!rangelow) {
err = regmap_read(radio->core->regmap,
SI476X_PROP_SEEK_BAND_BOTTOM,
&rangelow);
if (err)
goto unlock;
rangelow = si476x_to_v4l2(radio->core, rangelow);
}
if (!rangehigh) {
err = regmap_read(radio->core->regmap,
SI476X_PROP_SEEK_BAND_TOP,
&rangehigh);
if (err)
goto unlock;
rangehigh = si476x_to_v4l2(radio->core, rangehigh);
}
if (rangelow > rangehigh) {
err = -EINVAL;
goto unlock;
}
if (si476x_radio_range_is_inside_of_the_band(rangelow, rangehigh,
SI476X_BAND_FM)) {
func = SI476X_FUNC_FM_RECEIVER;
} else if (si476x_core_has_am(radio->core) &&
si476x_radio_range_is_inside_of_the_band(rangelow, rangehigh,
SI476X_BAND_AM)) {
func = SI476X_FUNC_AM_RECEIVER;
} else {
err = -EINVAL;
goto unlock;
}
err = si476x_radio_change_func(radio, func);
if (err < 0)
goto unlock;
if (seek->rangehigh) {
err = regmap_write(radio->core->regmap,
SI476X_PROP_SEEK_BAND_TOP,
v4l2_to_si476x(radio->core,
seek->rangehigh));
if (err)
goto unlock;
}
if (seek->rangelow) {
err = regmap_write(radio->core->regmap,
SI476X_PROP_SEEK_BAND_BOTTOM,
v4l2_to_si476x(radio->core,
seek->rangelow));
if (err)
goto unlock;
}
if (seek->spacing) {
err = regmap_write(radio->core->regmap,
SI476X_PROP_SEEK_FREQUENCY_SPACING,
v4l2_to_si476x(radio->core,
seek->spacing));
if (err)
goto unlock;
}
err = radio->ops->seek_start(radio->core,
seek->seek_upward,
seek->wrap_around);
unlock:
si476x_core_unlock(radio->core);
return err;
}
static int si476x_radio_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
{
int retval;
struct si476x_radio *radio = v4l2_ctrl_handler_to_radio(ctrl->handler);
si476x_core_lock(radio->core);
switch (ctrl->id) {
case V4L2_CID_SI476X_INTERCHIP_LINK:
if (si476x_core_has_diversity(radio->core)) {
if (radio->ops->phase_diversity) {
retval = radio->ops->phase_div_status(radio->core);
if (retval < 0)
break;
ctrl->val = !!SI476X_PHDIV_STATUS_LINK_LOCKED(retval);
retval = 0;
break;
} else {
retval = -ENOTTY;
break;
}
}
retval = -EINVAL;
break;
default:
retval = -EINVAL;
break;
}
si476x_core_unlock(radio->core);
return retval;
}
static int si476x_radio_s_ctrl(struct v4l2_ctrl *ctrl)
{
int retval;
enum si476x_phase_diversity_mode mode;
struct si476x_radio *radio = v4l2_ctrl_handler_to_radio(ctrl->handler);
si476x_core_lock(radio->core);
switch (ctrl->id) {
case V4L2_CID_SI476X_HARMONICS_COUNT:
retval = regmap_update_bits(radio->core->regmap,
SI476X_PROP_AUDIO_PWR_LINE_FILTER,
SI476X_PROP_PWR_HARMONICS_MASK,
ctrl->val);
break;
case V4L2_CID_POWER_LINE_FREQUENCY:
switch (ctrl->val) {
case V4L2_CID_POWER_LINE_FREQUENCY_DISABLED:
retval = regmap_update_bits(radio->core->regmap,
SI476X_PROP_AUDIO_PWR_LINE_FILTER,
SI476X_PROP_PWR_ENABLE_MASK,
0);
break;
case V4L2_CID_POWER_LINE_FREQUENCY_50HZ:
retval = regmap_update_bits(radio->core->regmap,
SI476X_PROP_AUDIO_PWR_LINE_FILTER,
SI476X_PROP_PWR_GRID_MASK,
SI476X_PROP_PWR_GRID_50HZ);
break;
case V4L2_CID_POWER_LINE_FREQUENCY_60HZ:
retval = regmap_update_bits(radio->core->regmap,
SI476X_PROP_AUDIO_PWR_LINE_FILTER,
SI476X_PROP_PWR_GRID_MASK,
SI476X_PROP_PWR_GRID_60HZ);
break;
default:
retval = -EINVAL;
break;
}
break;
case V4L2_CID_SI476X_RSSI_THRESHOLD:
retval = regmap_write(radio->core->regmap,
SI476X_PROP_VALID_RSSI_THRESHOLD,
ctrl->val);
break;
case V4L2_CID_SI476X_SNR_THRESHOLD:
retval = regmap_write(radio->core->regmap,
SI476X_PROP_VALID_SNR_THRESHOLD,
ctrl->val);
break;
case V4L2_CID_SI476X_MAX_TUNE_ERROR:
retval = regmap_write(radio->core->regmap,
SI476X_PROP_VALID_MAX_TUNE_ERROR,
ctrl->val);
break;
case V4L2_CID_RDS_RECEPTION:
/*
* It looks like RDS related properties are
* inaccesable when tuner is in AM mode, so cache the
* changes
*/
if (si476x_core_is_in_am_receiver_mode(radio->core))
regcache_cache_only(radio->core->regmap, true);
if (ctrl->val) {
retval = regmap_write(radio->core->regmap,
SI476X_PROP_FM_RDS_INTERRUPT_FIFO_COUNT,
radio->core->rds_fifo_depth);
if (retval < 0)
break;
if (radio->core->client->irq) {
retval = regmap_write(radio->core->regmap,
SI476X_PROP_FM_RDS_INTERRUPT_SOURCE,
SI476X_RDSRECV);
if (retval < 0)
break;
}
/* Drain RDS FIFO before enabling RDS processing */
retval = si476x_core_cmd_fm_rds_status(radio->core,
false,
true,
true,
NULL);
if (retval < 0)
break;
retval = regmap_update_bits(radio->core->regmap,
SI476X_PROP_FM_RDS_CONFIG,
SI476X_PROP_RDSEN_MASK,
SI476X_PROP_RDSEN);
} else {
retval = regmap_update_bits(radio->core->regmap,
SI476X_PROP_FM_RDS_CONFIG,
SI476X_PROP_RDSEN_MASK,
!SI476X_PROP_RDSEN);
}
if (si476x_core_is_in_am_receiver_mode(radio->core))
regcache_cache_only(radio->core->regmap, false);
break;
case V4L2_CID_TUNE_DEEMPHASIS:
retval = regmap_write(radio->core->regmap,
SI476X_PROP_AUDIO_DEEMPHASIS,
ctrl->val);
break;
case V4L2_CID_SI476X_DIVERSITY_MODE:
mode = si476x_phase_diversity_idx_to_mode(ctrl->val);
if (mode == radio->core->diversity_mode) {
retval = 0;
break;
}
if (si476x_core_is_in_am_receiver_mode(radio->core)) {
/*
* Diversity cannot be configured while tuner
* is in AM mode so save the changes and carry on.
*/
radio->core->diversity_mode = mode;
retval = 0;
} else {
retval = radio->ops->phase_diversity(radio->core, mode);
if (!retval)
radio->core->diversity_mode = mode;
}
break;
default:
retval = -EINVAL;
break;
}
si476x_core_unlock(radio->core);
return retval;
}
#ifdef CONFIG_VIDEO_ADV_DEBUG
static int si476x_radio_g_register(struct file *file, void *fh,
struct v4l2_dbg_register *reg)
{
int err;
unsigned int value;
struct si476x_radio *radio = video_drvdata(file);
si476x_core_lock(radio->core);
reg->size = 2;
err = regmap_read(radio->core->regmap,
(unsigned int)reg->reg, &value);
reg->val = value;
si476x_core_unlock(radio->core);
return err;
}
static int si476x_radio_s_register(struct file *file, void *fh,
const struct v4l2_dbg_register *reg)
{
int err;
struct si476x_radio *radio = video_drvdata(file);
si476x_core_lock(radio->core);
err = regmap_write(radio->core->regmap,
(unsigned int)reg->reg,
(unsigned int)reg->val);
si476x_core_unlock(radio->core);
return err;
}
#endif
static int si476x_radio_fops_open(struct file *file)
{
struct si476x_radio *radio = video_drvdata(file);
int err;
err = v4l2_fh_open(file);
if (err)
return err;
if (v4l2_fh_is_singular_file(file)) {
si476x_core_lock(radio->core);
err = si476x_core_set_power_state(radio->core,
SI476X_POWER_UP_FULL);
if (err < 0)
goto done;
err = si476x_radio_do_post_powerup_init(radio,
radio->core->power_up_parameters.func);
if (err < 0)
goto power_down;
err = si476x_radio_pretune(radio,
radio->core->power_up_parameters.func);
if (err < 0)
goto power_down;
si476x_core_unlock(radio->core);
/*Must be done after si476x_core_unlock to prevent a deadlock*/
v4l2_ctrl_handler_setup(&radio->ctrl_handler);
}
return err;
power_down:
si476x_core_set_power_state(radio->core,
SI476X_POWER_DOWN);
done:
si476x_core_unlock(radio->core);
v4l2_fh_release(file);
return err;
}
static int si476x_radio_fops_release(struct file *file)
{
int err;
struct si476x_radio *radio = video_drvdata(file);
if (v4l2_fh_is_singular_file(file) &&
atomic_read(&radio->core->is_alive))
si476x_core_set_power_state(radio->core,
SI476X_POWER_DOWN);
err = v4l2_fh_release(file);
return err;
}
static ssize_t si476x_radio_fops_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
ssize_t rval;
size_t fifo_len;
unsigned int copied;
struct si476x_radio *radio = video_drvdata(file);
/* block if no new data available */
if (kfifo_is_empty(&radio->core->rds_fifo)) {
if (file->f_flags & O_NONBLOCK)
return -EWOULDBLOCK;
rval = wait_event_interruptible(radio->core->rds_read_queue,
(!kfifo_is_empty(&radio->core->rds_fifo) ||
!atomic_read(&radio->core->is_alive)));
if (rval < 0)
return -EINTR;
if (!atomic_read(&radio->core->is_alive))
return -ENODEV;
}
fifo_len = kfifo_len(&radio->core->rds_fifo);
if (kfifo_to_user(&radio->core->rds_fifo, buf,
min(fifo_len, count),
&copied) != 0) {
dev_warn(&radio->videodev.dev,
"Error during FIFO to userspace copy\n");
rval = -EIO;
} else {
rval = (ssize_t)copied;
}
return rval;
}
static __poll_t si476x_radio_fops_poll(struct file *file,
struct poll_table_struct *pts)
{
struct si476x_radio *radio = video_drvdata(file);
__poll_t req_events = poll_requested_events(pts);
__poll_t err = v4l2_ctrl_poll(file, pts);
if (req_events & (EPOLLIN | EPOLLRDNORM)) {
if (atomic_read(&radio->core->is_alive))
poll_wait(file, &radio->core->rds_read_queue, pts);
if (!atomic_read(&radio->core->is_alive))
err = EPOLLHUP;
if (!kfifo_is_empty(&radio->core->rds_fifo))
err = EPOLLIN | EPOLLRDNORM;
}
return err;
}
static const struct v4l2_file_operations si476x_fops = {
.owner = THIS_MODULE,
.read = si476x_radio_fops_read,
.poll = si476x_radio_fops_poll,
.unlocked_ioctl = video_ioctl2,
.open = si476x_radio_fops_open,
.release = si476x_radio_fops_release,
};
static const struct v4l2_ioctl_ops si4761_ioctl_ops = {
.vidioc_querycap = si476x_radio_querycap,
.vidioc_g_tuner = si476x_radio_g_tuner,
.vidioc_s_tuner = si476x_radio_s_tuner,
.vidioc_g_frequency = si476x_radio_g_frequency,
.vidioc_s_frequency = si476x_radio_s_frequency,
.vidioc_s_hw_freq_seek = si476x_radio_s_hw_freq_seek,
.vidioc_enum_freq_bands = si476x_radio_enum_freq_bands,
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
#ifdef CONFIG_VIDEO_ADV_DEBUG
.vidioc_g_register = si476x_radio_g_register,
.vidioc_s_register = si476x_radio_s_register,
#endif
};
static const struct video_device si476x_viddev_template = {
.fops = &si476x_fops,
.name = DRIVER_NAME,
.release = video_device_release_empty,
};
static ssize_t si476x_radio_read_acf_blob(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
{
int err;
struct si476x_radio *radio = file->private_data;
struct si476x_acf_status_report report;
si476x_core_lock(radio->core);
if (radio->ops->acf_status)
err = radio->ops->acf_status(radio->core, &report);
else
err = -ENOENT;
si476x_core_unlock(radio->core);
if (err < 0)
return err;
return simple_read_from_buffer(user_buf, count, ppos, &report,
sizeof(report));
}
static const struct file_operations radio_acf_fops = {
.open = simple_open,
.llseek = default_llseek,
.read = si476x_radio_read_acf_blob,
};
static ssize_t si476x_radio_read_rds_blckcnt_blob(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
{
int err;
struct si476x_radio *radio = file->private_data;
struct si476x_rds_blockcount_report report;
si476x_core_lock(radio->core);
if (radio->ops->rds_blckcnt)
err = radio->ops->rds_blckcnt(radio->core, true,
&report);
else
err = -ENOENT;
si476x_core_unlock(radio->core);
if (err < 0)
return err;
return simple_read_from_buffer(user_buf, count, ppos, &report,
sizeof(report));
}
static const struct file_operations radio_rds_blckcnt_fops = {
.open = simple_open,
.llseek = default_llseek,
.read = si476x_radio_read_rds_blckcnt_blob,
};
static ssize_t si476x_radio_read_agc_blob(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
{
int err;
struct si476x_radio *radio = file->private_data;
struct si476x_agc_status_report report;
si476x_core_lock(radio->core);
if (radio->ops->rds_blckcnt)
err = radio->ops->agc_status(radio->core, &report);
else
err = -ENOENT;
si476x_core_unlock(radio->core);
if (err < 0)
return err;
return simple_read_from_buffer(user_buf, count, ppos, &report,
sizeof(report));
}
static const struct file_operations radio_agc_fops = {
.open = simple_open,
.llseek = default_llseek,
.read = si476x_radio_read_agc_blob,
};
static ssize_t si476x_radio_read_rsq_blob(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
{
int err;
struct si476x_radio *radio = file->private_data;
struct si476x_rsq_status_report report;
struct si476x_rsq_status_args args = {
.primary = false,
.rsqack = false,
.attune = false,
.cancel = false,
.stcack = false,
};
si476x_core_lock(radio->core);
if (radio->ops->rds_blckcnt)
err = radio->ops->rsq_status(radio->core, &args, &report);
else
err = -ENOENT;
si476x_core_unlock(radio->core);
if (err < 0)
return err;
return simple_read_from_buffer(user_buf, count, ppos, &report,
sizeof(report));
}
static const struct file_operations radio_rsq_fops = {
.open = simple_open,
.llseek = default_llseek,
.read = si476x_radio_read_rsq_blob,
};
static ssize_t si476x_radio_read_rsq_primary_blob(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
{
int err;
struct si476x_radio *radio = file->private_data;
struct si476x_rsq_status_report report;
struct si476x_rsq_status_args args = {
.primary = true,
.rsqack = false,
.attune = false,
.cancel = false,
.stcack = false,
};
si476x_core_lock(radio->core);
if (radio->ops->rds_blckcnt)
err = radio->ops->rsq_status(radio->core, &args, &report);
else
err = -ENOENT;
si476x_core_unlock(radio->core);
if (err < 0)
return err;
return simple_read_from_buffer(user_buf, count, ppos, &report,
sizeof(report));
}
static const struct file_operations radio_rsq_primary_fops = {
.open = simple_open,
.llseek = default_llseek,
.read = si476x_radio_read_rsq_primary_blob,
};
static int si476x_radio_init_debugfs(struct si476x_radio *radio)
{
struct dentry *dentry;
int ret;
dentry = debugfs_create_dir(dev_name(radio->v4l2dev.dev), NULL);
if (IS_ERR(dentry)) {
ret = PTR_ERR(dentry);
goto exit;
}
radio->debugfs = dentry;
dentry = debugfs_create_file("acf", S_IRUGO,
radio->debugfs, radio, &radio_acf_fops);
if (IS_ERR(dentry)) {
ret = PTR_ERR(dentry);
goto cleanup;
}
dentry = debugfs_create_file("rds_blckcnt", S_IRUGO,
radio->debugfs, radio,
&radio_rds_blckcnt_fops);
if (IS_ERR(dentry)) {
ret = PTR_ERR(dentry);
goto cleanup;
}
dentry = debugfs_create_file("agc", S_IRUGO,
radio->debugfs, radio, &radio_agc_fops);
if (IS_ERR(dentry)) {
ret = PTR_ERR(dentry);
goto cleanup;
}
dentry = debugfs_create_file("rsq", S_IRUGO,
radio->debugfs, radio, &radio_rsq_fops);
if (IS_ERR(dentry)) {
ret = PTR_ERR(dentry);
goto cleanup;
}
dentry = debugfs_create_file("rsq_primary", S_IRUGO,
radio->debugfs, radio,
&radio_rsq_primary_fops);
if (IS_ERR(dentry)) {
ret = PTR_ERR(dentry);
goto cleanup;
}
return 0;
cleanup:
debugfs_remove_recursive(radio->debugfs);
exit:
return ret;
}
static int si476x_radio_add_new_custom(struct si476x_radio *radio,
enum si476x_ctrl_idx idx)
{
int rval;
struct v4l2_ctrl *ctrl;
ctrl = v4l2_ctrl_new_custom(&radio->ctrl_handler,
&si476x_ctrls[idx],
NULL);
rval = radio->ctrl_handler.error;
if (ctrl == NULL && rval)
dev_err(radio->v4l2dev.dev,
"Could not initialize '%s' control %d\n",
si476x_ctrls[idx].name, rval);
return rval;
}
static int si476x_radio_probe(struct platform_device *pdev)
{
int rval;
struct si476x_radio *radio;
struct v4l2_ctrl *ctrl;
static atomic_t instance = ATOMIC_INIT(0);
radio = devm_kzalloc(&pdev->dev, sizeof(*radio), GFP_KERNEL);
if (!radio)
return -ENOMEM;
radio->core = i2c_mfd_cell_to_core(&pdev->dev);
v4l2_device_set_name(&radio->v4l2dev, DRIVER_NAME, &instance);
rval = v4l2_device_register(&pdev->dev, &radio->v4l2dev);
if (rval) {
dev_err(&pdev->dev, "Cannot register v4l2_device.\n");
return rval;
}
memcpy(&radio->videodev, &si476x_viddev_template,
sizeof(struct video_device));
radio->videodev.v4l2_dev = &radio->v4l2dev;
radio->videodev.ioctl_ops = &si4761_ioctl_ops;
video_set_drvdata(&radio->videodev, radio);
platform_set_drvdata(pdev, radio);
radio->v4l2dev.ctrl_handler = &radio->ctrl_handler;
v4l2_ctrl_handler_init(&radio->ctrl_handler,
1 + ARRAY_SIZE(si476x_ctrls));
if (si476x_core_has_am(radio->core)) {
ctrl = v4l2_ctrl_new_std_menu(&radio->ctrl_handler,
&si476x_ctrl_ops,
V4L2_CID_POWER_LINE_FREQUENCY,
V4L2_CID_POWER_LINE_FREQUENCY_60HZ,
0, 0);
rval = radio->ctrl_handler.error;
if (ctrl == NULL && rval) {
dev_err(&pdev->dev, "Could not initialize V4L2_CID_POWER_LINE_FREQUENCY control %d\n",
rval);
goto exit;
}
rval = si476x_radio_add_new_custom(radio,
SI476X_IDX_HARMONICS_COUNT);
if (rval < 0)
goto exit;
}
rval = si476x_radio_add_new_custom(radio, SI476X_IDX_RSSI_THRESHOLD);
if (rval < 0)
goto exit;
rval = si476x_radio_add_new_custom(radio, SI476X_IDX_SNR_THRESHOLD);
if (rval < 0)
goto exit;
rval = si476x_radio_add_new_custom(radio, SI476X_IDX_MAX_TUNE_ERROR);
if (rval < 0)
goto exit;
ctrl = v4l2_ctrl_new_std_menu(&radio->ctrl_handler,
&si476x_ctrl_ops,
V4L2_CID_TUNE_DEEMPHASIS,
V4L2_DEEMPHASIS_75_uS, 0, 0);
rval = radio->ctrl_handler.error;
if (ctrl == NULL && rval) {
dev_err(&pdev->dev, "Could not initialize V4L2_CID_TUNE_DEEMPHASIS control %d\n",
rval);
goto exit;
}
ctrl = v4l2_ctrl_new_std(&radio->ctrl_handler, &si476x_ctrl_ops,
V4L2_CID_RDS_RECEPTION,
0, 1, 1, 1);
rval = radio->ctrl_handler.error;
if (ctrl == NULL && rval) {
dev_err(&pdev->dev, "Could not initialize V4L2_CID_RDS_RECEPTION control %d\n",
rval);
goto exit;
}
if (si476x_core_has_diversity(radio->core)) {
si476x_ctrls[SI476X_IDX_DIVERSITY_MODE].def =
si476x_phase_diversity_mode_to_idx(radio->core->diversity_mode);
rval = si476x_radio_add_new_custom(radio, SI476X_IDX_DIVERSITY_MODE);
if (rval < 0)
goto exit;
rval = si476x_radio_add_new_custom(radio, SI476X_IDX_INTERCHIP_LINK);
if (rval < 0)
goto exit;
}
/* register video device */
rval = video_register_device(&radio->videodev, VFL_TYPE_RADIO, -1);
if (rval < 0) {
dev_err(&pdev->dev, "Could not register video device\n");
goto exit;
}
rval = si476x_radio_init_debugfs(radio);
if (rval < 0) {
dev_err(&pdev->dev, "Could not creat debugfs interface\n");
goto exit;
}
return 0;
exit:
v4l2_ctrl_handler_free(radio->videodev.ctrl_handler);
return rval;
}
static int si476x_radio_remove(struct platform_device *pdev)
{
struct si476x_radio *radio = platform_get_drvdata(pdev);
v4l2_ctrl_handler_free(radio->videodev.ctrl_handler);
video_unregister_device(&radio->videodev);
v4l2_device_unregister(&radio->v4l2dev);
debugfs_remove_recursive(radio->debugfs);
return 0;
}
MODULE_ALIAS("platform:si476x-radio");
static struct platform_driver si476x_radio_driver = {
.driver = {
.name = DRIVER_NAME,
},
.probe = si476x_radio_probe,
.remove = si476x_radio_remove,
};
module_platform_driver(si476x_radio_driver);
MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
MODULE_DESCRIPTION("Driver for Si4761/64/68 AM/FM Radio MFD Cell");
MODULE_LICENSE("GPL");
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