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Date: Fri, 16 Nov 2012 16:02:31 +0100
From: Hans Verkuil <hverkuil@...all.nl>
To: Andrey Smirnov <andrey.smirnov@...vergeddevices.net>
Cc: mchehab@...hat.com, sameo@...ux.intel.com,
broonie@...nsource.wolfsonmicro.com, perex@...ex.cz, tiwai@...e.de,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/6] Add a V4L2 driver for SI476X MFD
Hi Andrey,
Some more comments...
On Tue October 23 2012 20:44:31 Andrey Smirnov wrote:
> This commit adds a driver that exposes all the radio related
> functionality of the Si476x series of chips via the V4L2 subsystem.
>
> Signed-off-by: Andrey Smirnov <andrey.smirnov@...vergeddevices.net>
> ---
> drivers/media/radio/Kconfig | 17 +
> drivers/media/radio/Makefile | 1 +
> drivers/media/radio/radio-si476x.c | 1549 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 1567 insertions(+)
> create mode 100644 drivers/media/radio/radio-si476x.c
>
<cut>
> diff --git a/drivers/media/radio/radio-si476x.c b/drivers/media/radio/radio-si476x.c
> new file mode 100644
> index 0000000..c8fa90f
> --- /dev/null
> +++ b/drivers/media/radio/radio-si476x.c
> @@ -0,0 +1,1549 @@
> +#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 <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) (0b10000000 & (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;
> +}
> +
> +#define PRIVATE_CTL_IDX(x) (x - V4L2_CID_PRIVATE_BASE)
No. The new control IDs need to be added to include/uapi/linux/v4l2-controls.h
with unique IDs. V4L2_CID_PRIVATE_BASE must not be used anymore for new controls.
Since Halli Manjunatha hasn't worked on a new version of his patch with the new
fm controls it might be something you want to take on (I'm referring to the FM RX
control class).
> +
> +static int si476x_radio_s_ctrl(struct v4l2_ctrl *ctrl);
> +static int si476x_radio_g_volatile_ctrl(struct v4l2_ctrl *ctrl);
> +
> +static const char * const deemphasis[] = {
> + "75 us",
> + "50 us",
> +};
> +
> +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 w/secondary",
> + [SI476X_IDX_PHDIV_PRIMARY_ANTENNA] = "primary(primary antenna)",
> + [SI476X_IDX_PHDIV_SECONDARY_ANTENNA] = "primary(seconadary antenna)",
> + [SI476X_IDX_PHDIV_SECONDARY_COMBINING] = "secondary w/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_DEEMPHASIS,
> + SI476X_IDX_RDS_RECEPTION,
> + SI476X_IDX_DIVERSITY_MODE,
> + SI476X_IDX_INTERCHIP_LINK,
> +};
> +
> +static struct v4l2_ctrl_config si476x_ctrls[] = {
> + /*
> + Tuning parameters
> + 'max tune errors' is shared for both AM/FM mode of operation
> + */
> + [SI476X_IDX_RSSI_THRESHOLD] = {
> + .ops = &si476x_ctrl_ops,
> + .id = SI476X_CID_RSSI_THRESHOLD,
> + .name = "valid rssi threshold",
The names of the controls should be capitilized, just like a title of a book.
So this should become "Valid RSSI Threshold", etc.
> + .type = V4L2_CTRL_TYPE_INTEGER,
> + .min = -128,
> + .max = 127,
> + .step = 1,
> + },
> + [SI476X_IDX_SNR_THRESHOLD] = {
> + .ops = &si476x_ctrl_ops,
> + .id = SI476X_CID_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 = SI476X_CID_MAX_TUNE_ERROR,
> + .type = V4L2_CTRL_TYPE_INTEGER,
> + .name = "max tune errors",
> + .min = 0,
> + .max = 126 * 2,
> + .step = 2,
> + },
> + /*
> + Region specific parameters
> + */
> + [SI476X_IDX_HARMONICS_COUNT] = {
> + .ops = &si476x_ctrl_ops,
> + .id = SI476X_CID_HARMONICS_COUNT,
> + .type = V4L2_CTRL_TYPE_INTEGER,
> +
> + .name = "count of harmonics to reject",
> + .min = 0,
> + .max = 20,
> + .step = 1,
> + },
> + [SI476X_IDX_DEEMPHASIS] = {
> + .ops = &si476x_ctrl_ops,
> + .id = SI476X_CID_DEEMPHASIS,
> + .type = V4L2_CTRL_TYPE_MENU,
> + .name = "de-emphassis",
> + .qmenu = deemphasis,
> + .min = 0,
> + .max = ARRAY_SIZE(deemphasis) - 1,
> + .def = 0,
> + },
> + [SI476X_IDX_RDS_RECEPTION] = {
> + .ops = &si476x_ctrl_ops,
> + .id = SI476X_CID_RDS_RECEPTION,
> + .type = V4L2_CTRL_TYPE_BOOLEAN,
> + .name = "rds",
This name is too vague. Something like "RDS Reception" perhaps?
> + .min = 0,
> + .max = 1,
> + .step = 1,
> + },
> + [SI476X_IDX_DIVERSITY_MODE] = {
> + .ops = &si476x_ctrl_ops,
> + .id = SI476X_CID_DIVERSITY_MODE,
> + .type = V4L2_CTRL_TYPE_MENU,
> + .name = "phase diversity mode",
> + .qmenu = phase_diversity_modes,
> + .min = 0,
> + .max = ARRAY_SIZE(phase_diversity_modes) - 1,
> + },
> + [SI476X_IDX_INTERCHIP_LINK] = {
> + .ops = &si476x_ctrl_ops,
> + .id = SI476X_CID_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,
Note that all these controls need to be documented as well.
> + },
> +};
> +
> +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 Recieved Signal Quality(RSQ) status
> + * @rds_blckcnt: Get recived 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
> + *
> + * @core: Pointer to underlying core device
> + * @videodev: Pointer to video device created by V4L2 subsystem
> + * @ops: Vtable of functions. See struct si476x_radio_ops for details
> + * @kref: Reference counter
> + * @core_lock: An r/w semaphore to brebvent the deletion of underlying
> + * 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);
> +
> + strlcpy(capability->driver, radio->v4l2dev.name,
> + sizeof(capability->driver));
> + strlcpy(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)) {
> + strlcpy(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))
> + strlcpy(tuner->name, "AM/FM (primary)", sizeof(tuner->name));
> + else
> + strlcpy(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 {
> + strlcpy(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,
> + 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,
> + struct v4l2_frequency *f)
> +{
> + int err;
> + 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 = (f->frequency > 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);
> +
> + f->frequency = clamp(f->frequency,
> + si476x_bands[band].rangelow,
> + si476x_bands[band].rangehigh);
> +
> + if (si476x_radio_freq_is_inside_of_the_band(f->frequency, 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,
> + f->frequency);
> + 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, 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(!seek->rangelow) {
> + err = regmap_read(radio->core->regmap,
> + SI476X_PROP_SEEK_BAND_BOTTOM,
> + &rangelow);
> + if (!err)
> + rangelow = si476x_to_v4l2(radio->core, rangelow);
> + else
> + goto unlock;
> + }
> + if(!seek->rangehigh) {
> + err = regmap_read(radio->core->regmap,
> + SI476X_PROP_SEEK_BAND_TOP,
> + &rangehigh);
> + if (!err)
> + rangehigh = si476x_to_v4l2(radio->core, rangehigh);
> + else
> + goto unlock;
> + }
> +
> + 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 SI476X_CID_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;
If ops->phase_diversity wasn't set, then this control shouldn't have been added
in the first place. It should never return 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 SI476X_CID_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 SI476X_CID_RSSI_THRESHOLD:
> + retval = regmap_write(radio->core->regmap,
> + SI476X_PROP_VALID_RSSI_THRESHOLD,
> + ctrl->val);
> + break;
> + case SI476X_CID_SNR_THRESHOLD:
> + retval = regmap_write(radio->core->regmap,
> + SI476X_PROP_VALID_SNR_THRESHOLD,
> + ctrl->val);
> + break;
> + case SI476X_CID_MAX_TUNE_ERROR:
> + retval = regmap_write(radio->core->regmap,
> + SI476X_PROP_VALID_MAX_TUNE_ERROR,
> + ctrl->val);
> + break;
> + case SI476X_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 SI476X_CID_DEEMPHASIS:
> + retval = regmap_write(radio->core->regmap,
> + SI476X_PROP_AUDIO_DEEMPHASIS,
> + ctrl->val);
> + break;
> +
> + case SI476X_CID_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 tha 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;
> +}
> +
> +static int si476x_radio_g_chip_ident(struct file *file, void *fh,
> + struct v4l2_dbg_chip_ident *chip)
> +{
> + if (chip->match.type == V4L2_CHIP_MATCH_HOST &&
> + v4l2_chip_match_host(&chip->match))
> + return 0;
> + return -EINVAL;
> +}
> +
> +
> +#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,
> + 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 unsigned int si476x_radio_fops_poll(struct file *file,
> + struct poll_table_struct *pts)
> +{
> + struct si476x_radio *radio = video_drvdata(file);
> + unsigned long req_events = poll_requested_events(pts);
> + int err = v4l2_ctrl_poll(file, pts);
> +
> + if (req_events & (POLLIN | POLLRDNORM)) {
> + if (atomic_read(&radio->core->is_alive))
> + poll_wait(file, &radio->core->rds_read_queue, pts);
> +
> + if (!atomic_read(&radio->core->is_alive))
> + err = POLLHUP;
> +
> + if (!kfifo_is_empty(&radio->core->rds_fifo))
> + err = POLLIN | POLLRDNORM;
> + }
> +
> + 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,
> +
> + .vidioc_g_chip_ident = si476x_radio_g_chip_ident,
> +#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 __devinit 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);
What these files are used for and how to interpret the contents should be
documented somewhere. Usually a document in Documentation/video4linux is a good
place for that.
BTW: have you tested compiling this driver if debugfs is not configured?
> + if (IS_ERR(dentry)) {
> + ret = PTR_ERR(dentry);
> + goto cleanup;
> + }
> +
> + return 0;
> +cleanup:
> + debugfs_remove_recursive(radio->debugfs);
> +exit:
> + return ret;
> +}
> +
> +
> +static int __devinit 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 __devinit si476x_radio_probe(struct platform_device *pdev)
> +{
> + int rval;
> + struct si476x_radio *radio;
> +
> + 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);
> +
> + set_bit(V4L2_FL_USE_FH_PRIO, &radio->videodev.flags);
> +
> + 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)) {
> + struct v4l2_ctrl *ctrl;
> +
> + 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;
> +
> + rval = si476x_radio_add_new_custom(radio, SI476X_IDX_DEEMPHASIS);
> + if (rval < 0)
> + goto exit;
> +
> + rval = si476x_radio_add_new_custom(radio, SI476X_IDX_RDS_RECEPTION);
> + if (rval < 0)
> + 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);
> + si476x_radio_add_new_custom(radio, SI476X_IDX_DIVERSITY_MODE);
> + if (rval < 0)
> + goto exit;
> +
> + 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 = {
> + .probe = si476x_radio_probe,
> + .remove = __devexit_p(si476x_radio_remove),
> + .driver = {
> + .name = DRIVER_NAME,
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +static int __init si476x_module_init(void)
> +{
> + return platform_driver_register(&si476x_radio_driver);
> +}
> +module_init(si476x_module_init);
> +
> +static void __exit si476x_module_exit(void)
> +{
> + platform_driver_unregister(&si476x_radio_driver);
> +}
> +module_exit(si476x_module_exit);
> +
> +MODULE_AUTHOR("Andrey Smirnov <andrey.smirnov@...vergeddevices.net>");
> +MODULE_DESCRIPTION("Driver for Si4761/64/68 AM/FM Radio MFD Cell");
> +MODULE_LICENSE("GPL");
>
Regards,
Hans
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