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e83ce3005d
linux/drivers/media/radio/radio-si476x.c
Hans Verkuil e83ce3005d media: media/radio: set device_caps in struct video_device 
Instead of filling in the struct v4l2_capability device_caps
field, fill in the struct video_device device_caps field.

That way the V4L2 core knows what the capabilities of the
video device are.

But this only really works if all drivers use this, so convert
all radio drivers in this patch.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
2019-06-05 08:19:12 -04:00

1584 lines
40 KiB
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);
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;
radio->videodev.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))
radio->videodev.device_caps |= V4L2_CAP_RDS_CAPTURE |
V4L2_CAP_READWRITE;
si476x_core_unlock(radio->core);
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 create 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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