[PATCH 2/3] Add a V4L2 driver for SI476X MFD

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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@xxxxxxxxxxxxxxxxxxxx>
---
 drivers/media/radio/Kconfig        |   17 +
 drivers/media/radio/radio-si476x.c | 1307 ++++++++++++++++++++++++++++++++++++
 2 files changed, 1324 insertions(+)
 create mode 100644 drivers/media/radio/radio-si476x.c

diff --git a/drivers/media/radio/Kconfig b/drivers/media/radio/Kconfig
index 8090b87..3c79d09 100644
--- a/drivers/media/radio/Kconfig
+++ b/drivers/media/radio/Kconfig
@@ -16,6 +16,23 @@ config RADIO_SI470X
 	bool "Silicon Labs Si470x FM Radio Receiver support"
 	depends on VIDEO_V4L2
 
+config RADIO_SI476X
+	tristate "Silicon Laboratories Si476x I2C FM Radio"
+	depends on I2C && VIDEO_V4L2
+	select MFD_CORE
+	select MFD_SI476X_CORE
+	select SND_SOC_SI476X
+	---help---
+	  Choose Y here if you have this FM radio chip.
+
+	  In order to control your radio card, you will need to use programs
+	  that are compatible with the Video For Linux 2 API.  Information on
+	  this API and pointers to "v4l2" programs may be found at
+	  <file:Documentation/video4linux/API.html>.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called radio-si476x.
+
 source "drivers/media/radio/si470x/Kconfig"
 
 config USB_MR800
diff --git a/drivers/media/radio/radio-si476x.c b/drivers/media/radio/radio-si476x.c
new file mode 100644
index 0000000..f313005
--- /dev/null
+++ b/drivers/media/radio/radio-si476x.c
@@ -0,0 +1,1307 @@
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/atomic.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.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 DRIVER_NAME "si476x-radio"
+#define DRIVER_CARD "SI476x AM/FM Receiver"
+
+static const char * const deemphasis[] = {
+	"75 us",
+	"50 us",
+};
+
+static const char * const grid_frequency[] = {
+	"50 Hz",
+	"60 Hz",
+};
+
+#define PRIVATE_CTL_IDX(x) (x - V4L2_CID_PRIVATE_BASE)
+
+static const struct v4l2_queryctrl si476x_ctrls[] = {
+	/*
+	   Tuning parameters
+	   'max tune errors' is shared for both AM/FM mode of operation
+	*/
+	{
+		.id		= SI476X_CID_RSSI_THRESHOLD,
+		.type		= V4L2_CTRL_TYPE_INTEGER,
+		.name		= "valid rssi threshold",
+		.minimum	= -128,
+		.maximum	= 127,
+		.step		= 1,
+	},
+	{
+		.id		= SI476X_CID_SNR_THRESHOLD,
+		.type		= V4L2_CTRL_TYPE_INTEGER,
+		.name		= "valid snr threshold",
+		.minimum	= -128,
+		.maximum	= 127,
+		.step		= 1,
+	},
+	{
+		.id		= SI476X_CID_MAX_TUNE_ERROR,
+		.type		= V4L2_CTRL_TYPE_INTEGER,
+		.name		= "max tune errors",
+		.minimum	= 0,
+		.maximum	= 126 * 2,
+		.step		= 2,
+	},
+	/*
+	   Region specific parameters
+	*/
+	{
+		.id		= SI476X_CID_GRID_FREQUENCY,
+		.type		= V4L2_CTRL_TYPE_MENU,
+		.name		= "power grid frequency",
+		.minimum	= 0,
+		.maximum	= ARRAY_SIZE(grid_frequency) - 1,
+		.step		= 1,
+	},
+	{
+		.id		= SI476X_CID_HARMONICS_COUNT,
+		.type		= V4L2_CTRL_TYPE_INTEGER,
+		.name		= "# of harmonics to reject",
+		.minimum	= 0,
+		.maximum	= 20,
+		.step		= 1,
+	},
+	{
+		.id		= SI476X_CID_SEEK_SPACING,
+		.type		= V4L2_CTRL_TYPE_INTEGER,
+		.name		= "seek frequency spacing",
+		.minimum	= 0,
+		.maximum	= 0xFFFF,
+		.step		= 1,
+	},
+	{
+		.id		= SI476X_CID_SEEK_BAND_TOP,
+		.type		= V4L2_CTRL_TYPE_INTEGER,
+		.name		= "seek band top",
+		.minimum	= 0,
+		.maximum	= 0xFFFF,
+		.step		= 1,
+	},
+	{
+		.id		= SI476X_CID_SEEK_BAND_BOTTOM,
+		.type		= V4L2_CTRL_TYPE_INTEGER,
+		.name		= "seek band bottom",
+		.minimum	= 0,
+		.maximum	= 0xFFFF,
+		.step		= 1,
+	},
+	{
+		.id		= SI476X_CID_DEEMPHASIS,
+		.type		= V4L2_CTRL_TYPE_MENU,
+		.name		= "de-emphassis",
+		.minimum	= 0,
+		.maximum	= ARRAY_SIZE(deemphasis) - 1,
+		.step		= 1,
+		.default_value	= 0,
+	},
+	{
+		.id		= SI476X_CID_RDS_RECEPTION,
+		.type		= V4L2_CTRL_TYPE_BOOLEAN,
+		.name		= "rds",
+		.minimum	= 0,
+		.maximum	= 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 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 si476x_core  *core;
+	struct video_device *videodev;
+
+	/* This field should not be accesses unless core lock is held */
+	const struct si476x_radio_ops *ops;
+
+	struct kref kref;
+	struct rw_semaphore core_lock;
+};
+static inline struct si476x_radio *kref_to_si476x_radio(struct kref *ref)
+{
+	return container_of(ref, struct si476x_radio, kref);
+}
+
+static void si476x_radio_delete(struct kref *kref);
+static inline void si476x_radio_get(struct si476x_radio *radio)
+{
+	kref_get(&radio->kref);
+}
+
+static inline void si476x_radio_put(struct si476x_radio *radio)
+{
+	kref_put(&radio->kref, si476x_radio_delete);
+}
+
+
+static int si476x_radio_initialize_mode(struct si476x_radio *);
+
+/*
+ * si476x_vidioc_querycap - query device capabilities
+ */
+static int si476x_querycap(struct file *file, void *priv,
+			   struct v4l2_capability *capability)
+{
+	strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
+	strlcpy(capability->card,   DRIVER_CARD, sizeof(capability->card));
+	capability->capabilities = V4L2_CAP_HW_FREQ_SEEK |
+		V4L2_CAP_TUNER | V4L2_CAP_RADIO;
+
+	return 0;
+}
+
+static int si476x_queryctrl(struct file *file, void *priv,
+			    struct v4l2_queryctrl *qc)
+{
+	int retval;
+
+	/* search video control */
+	switch (qc->id) {
+	case SI476X_CID_RSSI_THRESHOLD:
+	case SI476X_CID_SNR_THRESHOLD:
+	case SI476X_CID_MAX_TUNE_ERROR:
+	case SI476X_CID_SEEK_SPACING:
+	case SI476X_CID_SEEK_BAND_TOP:
+	case SI476X_CID_SEEK_BAND_BOTTOM:
+	case SI476X_CID_RDS_RECEPTION:
+	case SI476X_CID_HARMONICS_COUNT:
+	case SI476X_CID_GRID_FREQUENCY:
+	case SI476X_CID_DEEMPHASIS:
+		memcpy(qc, &si476x_ctrls[PRIVATE_CTL_IDX(qc->id)],
+		       sizeof(*qc));
+		retval = 0;
+		break;
+	default:
+		retval = -EINVAL;
+		break;
+	}
+
+	return retval;
+}
+
+static int si476x_querymenu(struct file *file, void *fh,
+			    struct v4l2_querymenu *m)
+{
+	switch (m->id) {
+	case SI476X_CID_GRID_FREQUENCY:
+		if (m->index > ARRAY_SIZE(grid_frequency) - 1)
+			return -EINVAL;
+		strncpy(m->name, grid_frequency[m->index], sizeof(m->name));
+		break;
+	case SI476X_CID_DEEMPHASIS:
+		if (m->index > ARRAY_SIZE(deemphasis) - 1)
+			return -EINVAL;
+		strncpy(m->name, deemphasis[m->index], sizeof(m->name));
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* si4713_g_ctrl - get the value of a control */
+static int si476x_g_ctrl(struct file *file, void *priv,
+			 struct v4l2_control *ctrl)
+{
+	int retval;
+	struct si476x_radio *radio = video_drvdata(file);
+
+	down_read(&radio->core_lock);
+
+	if (!radio->core) {
+		retval = -ENODEV;
+		goto up_semaphore;
+	}
+
+	si476x_core_lock(radio->core);
+
+	switch (ctrl->id) {
+	case SI476X_CID_RSSI_THRESHOLD:
+		retval = si476x_core_get_valid_rssi_threshold(radio->core);
+		break;
+	case SI476X_CID_SNR_THRESHOLD:
+		retval = si476x_core_get_valid_snr_threshold(radio->core);
+		break;
+	case SI476X_CID_MAX_TUNE_ERROR:
+		retval = si476x_core_get_valid_max_tune_error(radio->core);
+		break;
+	case SI476X_CID_SEEK_SPACING:
+		retval = si476x_core_get_frequency_spacing(radio->core);
+		break;
+	case SI476X_CID_SEEK_BAND_TOP:
+		retval = si476x_core_get_seek_band_top(radio->core);
+		break;
+	case SI476X_CID_SEEK_BAND_BOTTOM:
+		retval = si476x_core_get_seek_band_bottom(radio->core);
+		break;
+	case SI476X_CID_RDS_RECEPTION:
+		retval = si476x_core_get_rds_reception(radio->core);
+		break;
+	case SI476X_CID_DEEMPHASIS:
+		retval = si476x_core_get_audio_deemphasis(radio->core);
+		break;
+	case SI476X_CID_HARMONICS_COUNT:
+		retval = si476x_core_get_audio_pwr_line_filter(radio->core);
+		break;
+	case SI476X_CID_GRID_FREQUENCY:
+		retval = si476x_core_get_audio_pwr_line_filter(radio->core);
+		break;
+	default:
+		retval = -EINVAL;
+		break;
+	}
+
+	if (retval >= 0) {
+		if (ctrl->id == SI476X_CID_HARMONICS_COUNT)
+			ctrl->value = retval & 0x0F;
+		else if (ctrl->id == SI476X_CID_GRID_FREQUENCY)
+			ctrl->value = !!(PWRLINEFLTR & retval);
+		else
+			ctrl->value = retval;
+
+		retval = 0;
+	}
+	si476x_core_unlock(radio->core);
+
+up_semaphore:
+	up_read(&radio->core_lock);
+	return retval;
+}
+
+/* si4713_s_ctrl - set the value of a control */
+static int si476x_s_ctrl(struct file *file, void *priv,
+			 struct v4l2_control *ctrl)
+{
+	int old_value, retval, count;
+	struct si476x_radio *radio = video_drvdata(file);
+
+	down_read(&radio->core_lock);
+
+	if (!radio->core) {
+		retval = -ENODEV;
+		goto up_semaphore;
+	}
+
+	si476x_core_lock(radio->core);
+
+	switch (ctrl->id) {
+	case SI476X_CID_RSSI_THRESHOLD:
+		retval = si476x_core_set_valid_rssi_threshold(radio->core,
+							      ctrl->value);
+		break;
+	case SI476X_CID_SNR_THRESHOLD:
+		retval = si476x_core_set_valid_snr_threshold(radio->core,
+							     ctrl->value);
+		break;
+	case SI476X_CID_MAX_TUNE_ERROR:
+		retval = si476x_core_set_valid_max_tune_error(radio->core,
+							      ctrl->value);
+		break;
+	case SI476X_CID_SEEK_SPACING:
+		retval = si476x_core_set_frequency_spacing(radio->core,
+							   ctrl->value);
+		break;
+	case SI476X_CID_SEEK_BAND_TOP:
+		retval = si476x_core_set_seek_band_top(radio->core,
+						       ctrl->value);
+		break;
+	case SI476X_CID_SEEK_BAND_BOTTOM:
+		retval = si476x_core_set_seek_band_bottom(radio->core,
+							  ctrl->value);
+		break;
+	case SI476X_CID_RDS_RECEPTION:
+		retval = si476x_core_set_rds_reception(radio->core,
+						       ctrl->value);
+		break;
+	case SI476X_CID_DEEMPHASIS:
+		retval = si476x_core_set_audio_deemphasis(radio->core,
+							  ctrl->value);
+		break;
+	case SI476X_CID_HARMONICS_COUNT:
+		old_value = si476x_core_get_audio_pwr_line_filter(radio->core);
+		if (old_value < 0) {
+			retval = old_value;
+			break;
+		}
+
+		retval = si476x_core_set_audio_pwr_line_filter(radio->core,
+					(ctrl->value > 0) ? true : false,
+					!!(PWRLINEFLTR & old_value),
+					ctrl->value);
+		break;
+	case SI476X_CID_GRID_FREQUENCY:
+		old_value = si476x_core_get_audio_pwr_line_filter(radio->core);
+		if (old_value < 0) {
+			retval = old_value;
+			break;
+		}
+		count  = old_value & 0x0F;
+
+		retval = si476x_core_set_audio_pwr_line_filter(radio->core,
+						(count > 0) ? true : false,
+						ctrl->value,
+						count);
+		break;
+	default:
+		retval = -EINVAL;
+		break;
+	}
+
+	si476x_core_unlock(radio->core);
+
+up_semaphore:
+	up_read(&radio->core_lock);
+	return retval;
+}
+
+static int si476x_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);
+
+	if (tuner->index != 0) {
+		err = -EINVAL;
+		goto exit;
+	}
+
+	down_read(&radio->core_lock);
+
+	if (!radio->core) {
+		err = -ENODEV;
+		goto up_semaphore;
+	}
+
+	tuner->type       = V4L2_TUNER_RADIO;
+	tuner->capability = V4L2_TUNER_CAP_LOW; /* Measure frequncies
+						 * in multiples of
+						 * 62.5 Hz */
+	if (radio->core->chip_id < 5) { /* Si4760/61/62/63/64 */
+		strlcpy(tuner->name, "AM/FM", sizeof(tuner->name));
+
+		tuner->capability |=  V4L2_TUNER_CAP_STEREO
+			| V4L2_TUNER_CAP_RDS
+			| V4L2_TUNER_CAP_RDS_BLOCK_IO;
+
+		tuner->rangelow  = 520 * FREQ_MUL / 1000;
+
+		tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
+		tuner->audmode = V4L2_TUNER_MODE_STEREO;
+	} else {  /* Si4768/69 */
+		strlcpy(tuner->name, "FM", sizeof(tuner->name));
+		tuner->rangelow  = 64 * FREQ_MUL;
+		tuner->capability |= V4L2_TUNER_CAP_RDS
+			| V4L2_TUNER_CAP_RDS_BLOCK_IO;
+	}
+
+	tuner->rxsubchans |= V4L2_TUNER_SUB_RDS;
+
+
+	if (radio->core->diversity_mode == SI476X_PHDIV_SECONDARY_ANTENNA ||
+	    radio->core->diversity_mode == SI476X_PHDIV_SECONDARY_COMBINING) {
+		strlcpy(tuner->name, "FM (secondary)", sizeof(tuner->name));
+		tuner->capability = 0;
+		tuner->rxsubchans = 0;
+		tuner->audmode    = 0;
+	}
+
+	if (radio->core->diversity_mode == SI476X_PHDIV_PRIMARY_ANTENNA ||
+	    radio->core->diversity_mode == SI476X_PHDIV_PRIMARY_COMBINING)
+		strlcpy(tuner->name, "AM/FM (primary)", sizeof(tuner->name));
+
+	tuner->rangehigh = 108 * FREQ_MUL;
+	tuner->afc = 1;
+
+	si476x_core_lock(radio->core);
+	{
+		struct si476x_rsq_status_args args = {
+			.primary	= false,
+			.rsqack		= false,
+			.attune		= false,
+			.cancel		= false,
+			.stcack		= false,
+		};
+		if (radio->ops->rsq_status) {
+			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;
+			}
+		} else {
+			tuner->signal = 0;
+			err = -EINVAL;
+		}
+	}
+	si476x_core_unlock(radio->core);
+
+up_semaphore:
+	up_read(&radio->core_lock);
+exit:
+	return err;
+}
+
+/**
+ * The switching between AM/FM mode of the tuner is implemented as
+ * swtiching between tow audio stream of the V4L2 tuner. SO each AM/FM
+ * capabel chips reports two audio streams "AM Radio" and "FM Radio".
+ * Selectio=ng one or the other would put hte tuner in an appropriate
+ * mode.
+ */
+
+static int si476x_enumaudio(struct file *file, void *fh,
+			    struct v4l2_audio *audio)
+{
+	int err;
+	struct si476x_radio *radio = video_drvdata(file);
+
+	down_read(&radio->core_lock);
+
+	if (!radio->core) {
+		err = -ENODEV;
+		goto up_semaphore;
+	}
+
+	if (radio->core->chip_id >= 5) {
+		err = -EINVAL;
+		goto up_semaphore;
+	}
+
+	err = 0;
+	switch (audio->index) {
+	case 0:
+		strcpy(audio->name, "FM Radio");
+		audio->capability = V4L2_AUDCAP_STEREO;
+		audio->mode = 0;
+		break;
+	case 1:
+		strcpy(audio->name, "AM Radio");
+		audio->capability = 0;
+		audio->mode = 0;
+		break;
+	default:
+		err = -EINVAL;
+	}
+
+up_semaphore:
+	up_read(&radio->core_lock);
+	return err;
+}
+
+static int si476x_g_audio(struct file *file, void *priv,
+			  struct v4l2_audio *audio)
+{
+	int err;
+	struct si476x_radio *radio = video_drvdata(file);
+
+	down_read(&radio->core_lock);
+
+	if (!radio->core) {
+		err = -ENODEV;
+		goto up_semaphore;
+	}
+
+	if (radio->core->chip_id >= 5) {
+		err = -EINVAL;
+		goto up_semaphore;
+	}
+
+	si476x_core_lock(radio->core);
+	err = 0;
+	switch (radio->core->power_up_parameters.func) {
+	case SI476X_FUNC_FM_RECEIVER:
+		audio->index = 0;
+		strcpy(audio->name, "FM Radio");
+		audio->capability = V4L2_AUDCAP_STEREO;
+		break;
+	case SI476X_FUNC_AM_RECEIVER:
+		audio->index = 1;
+		strcpy(audio->name, "AM Radio");
+		audio->capability = 0;
+		break;
+	default:
+		err = -EINVAL;
+		goto unlock;
+	}
+	audio->mode = 0;
+unlock:
+	si476x_core_unlock(radio->core);
+up_semaphore:
+	up_read(&radio->core_lock);
+	return err;
+}
+
+static int si476x_s_audio(struct file *file, void *priv,
+			  struct v4l2_audio *audio)
+{
+	int err;
+	struct si476x_radio *radio = video_drvdata(file);
+
+	down_read(&radio->core_lock);
+
+	if (!radio->core) {
+		err = -ENODEV;
+		goto up_semaphore;
+	}
+
+	if (radio->core->chip_id >= 5 || audio->index > 1) {
+		err = -EINVAL;
+		goto up_semaphore;
+	}
+
+	si476x_core_lock(radio->core);
+
+	/*
+	   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 ((audio->index == 0 &&
+	     radio->core->power_up_parameters.func
+	     == SI476X_FUNC_FM_RECEIVER) ||
+	    (audio->index == 1 &&
+	     radio->core->power_up_parameters.func
+	     == SI476X_FUNC_AM_RECEIVER)) {
+		err = 0;
+		goto unlock;
+	}
+
+	err = si476x_core_stop(radio->core, true);
+	if (err < 0)
+		goto unlock;
+
+	switch (audio->index) {
+	case 0:
+		radio->core->power_up_parameters.func = SI476X_FUNC_FM_RECEIVER;
+		break;
+	case 1:
+		radio->core->power_up_parameters.func = SI476X_FUNC_AM_RECEIVER;
+		break;
+	}
+
+	err = si476x_core_start(radio->core, true);
+	if (!err)
+		err = si476x_radio_initialize_mode(radio);
+
+unlock:
+	si476x_core_unlock(radio->core);
+up_semaphore:
+	up_read(&radio->core_lock);
+	return err;
+}
+
+static int si476x_g_frequency(struct file *file, void *priv,
+			      struct v4l2_frequency *f)
+{
+	int err;
+	struct si476x_radio *radio = video_drvdata(file);
+
+	down_read(&radio->core_lock);
+
+	if (!radio->core) {
+		err = -ENODEV;
+		goto up_semaphore;
+	}
+
+	si476x_core_lock(radio->core);
+
+	f->type = V4L2_TUNER_RADIO;
+	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);
+up_semaphore:
+	up_read(&radio->core_lock);
+	return err;
+}
+
+static int si476x_s_frequency(struct file *file, void *priv,
+			      struct v4l2_frequency *f)
+{
+	int err;
+	struct si476x_radio *radio = video_drvdata(file);
+
+	down_read(&radio->core_lock);
+
+	if (!radio->core) {
+		err = -ENODEV;
+		goto up_semaphore;
+	}
+	si476x_core_lock(radio->core);
+
+	switch (radio->core->power_up_parameters.func) {
+	case SI476X_FUNC_FM_RECEIVER:
+		/* FIXME change teh constants to use Hz */
+		if (v4l2_to_hz(f->frequency) < FM_FREQ_RANGE_LOW ||
+		    v4l2_to_hz(f->frequency) > FM_FREQ_RANGE_HIGH) {
+			err = -EDOM;
+			goto unlock;
+		}
+		break;
+	case SI476X_FUNC_AM_RECEIVER:
+		if (v4l2_to_hz(f->frequency) < AM_FREQ_RANGE_LOW ||
+		    v4l2_to_hz(f->frequency) > AM_FREQ_RANGE_HIGH) {
+			err = -EDOM;
+			goto unlock;
+		}
+		break;
+	case SI476X_FUNC_WB_RECEIVER:
+	case SI476X_FUNC_BOOTLOADER:
+		break;
+	}
+
+	if (radio->ops->tune_freq) {
+		struct si476x_tune_freq_args args = {
+			.zifsr		= false,
+			.hd		= false,
+			.injside	= SI476X_INJSIDE_AUTO,
+			.freq		= v4l2_to_si476x(radio->core,
+							 f->frequency),
+			.tunemode	= SI476X_SM_INITIALIZE_AUDIO,
+			.smoothmetrics	= SI476X_TM_VALIDATED_NORMAL_TUNE,
+			.antcap		= 0,
+		};
+		err = radio->ops->tune_freq(radio->core, &args);
+	} else {
+		err = -ENOTSUPP;
+	}
+
+unlock:
+	si476x_core_unlock(radio->core);
+
+up_semaphore:
+	up_read(&radio->core_lock);
+	return err;
+}
+
+static int si476x_s_hw_freq_seek(struct file *file, void *priv,
+				 struct v4l2_hw_freq_seek *seek)
+{
+	int err;
+	struct si476x_radio *radio = video_drvdata(file);
+
+	down_read(&radio->core_lock);
+
+	if (!radio->core) {
+		err = -ENODEV;
+		goto up_semaphore;
+	}
+	/* FIXME: Add seek->spacing support */
+	si476x_core_lock(radio->core);
+	if (radio->ops->seek_start)
+		err = radio->ops->seek_start(radio->core,
+					     seek->seek_upward,
+					     seek->wrap_around);
+	else
+		err = -ENOTSUPP;
+	si476x_core_unlock(radio->core);
+
+up_semaphore:
+	up_read(&radio->core_lock);
+	return err;
+}
+
+static int __g_register(struct file *file, void *fh,
+			     struct v4l2_dbg_register *reg)
+{
+	struct si476x_radio *radio = video_drvdata(file);
+
+	if (si476x_core_is_valid_property(radio->core, reg->reg)) {
+		reg->size = 2;
+		reg->val  = si476x_core_cmd_get_property(radio->core, reg->reg);
+		return (reg->val < 0) ? reg->val : 0;
+	} else {
+		return -EINVAL;
+	}
+}
+
+static int __s_register(struct file *file, void *fh,
+			struct v4l2_dbg_register *reg)
+{
+	int err;
+	struct si476x_radio *radio = video_drvdata(file);
+
+	if (si476x_core_is_valid_property(radio->core, reg->reg) &&
+	   !si476x_core_is_readonly_property(radio->core, reg->reg)) {
+		err = si476x_core_cmd_set_property(radio->core,
+						   reg->reg, reg->val);
+	} else {
+		err = -EINVAL;
+	}
+
+	return err;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int si476x_g_register(struct file *file, void *fh,
+			     struct v4l2_dbg_register *reg)
+{
+	int err;
+	struct si476x_radio *radio = video_drvdata(file);
+
+	down_read(&radio->core_lock);
+
+	if (!radio->core) {
+		err = -ENODEV;
+	} else {
+		si476x_core_lock(radio->core);
+		err = __g_register(file, fh, reg);
+		si476x_core_unlock(radio->core);
+	}
+
+	up_read(&radio->core_lock);
+	return err;
+}
+
+static int si476x_s_register(struct file *file, void *fh,
+			     struct v4l2_dbg_register *reg)
+{
+
+	int err;
+	struct si476x_radio *radio = video_drvdata(file);
+
+	down_read(&radio->core_lock);
+
+	if (!radio->core) {
+		err = -ENODEV;
+	} else {
+		si476x_core_lock(radio->core);
+		err = __s_register(file, fh, reg);
+		si476x_core_unlock(radio->core);
+	}
+
+	up_read(&radio->core_lock);
+	return err;
+}
+#endif
+
+static long si476x_default(struct file *file, void *fh,
+			   bool valid_prio, int cmd, void *arg)
+{
+	long rval;
+	struct si476x_rsq_status_args args = {
+		.primary	= false,
+		.rsqack		= false,
+		.attune		= false,
+		.cancel		= false,
+		.stcack		= false,
+	};
+	struct si476x_radio *radio  = video_drvdata(file);
+
+	down_read(&radio->core_lock);
+	if (!radio->core) {
+		rval = -ENODEV;
+		goto up_semaphore;
+	}
+
+	si476x_core_lock(radio->core);
+	switch (cmd) {
+	case SI476X_IOC_GET_RSQ_PRIMARY:
+		args.primary = true;
+	case SI476X_IOC_GET_RSQ: /* FALLTHROUG */
+		if (radio->ops->rsq_status)
+			rval = radio->ops->rsq_status(radio->core, &args,
+				(struct si476x_rsq_status_report *) arg);
+		else
+			rval = -ENOTTY;
+		break;
+	case SI476X_IOC_SET_PHDIV_MODE:
+		if (radio->ops->phase_diversity)
+			rval = radio->ops->phase_diversity(radio->core,
+				*((enum si476x_phase_diversity_mode *) arg));
+		else
+			rval = -ENOTTY;
+		break;
+	case SI476X_IOC_GET_PHDIV_STATUS:
+		if (radio->ops->phase_div_status) {
+			rval = radio->ops->phase_div_status(radio->core);
+			if (rval >= 0) {
+				*((int *)arg) = rval;
+				rval = 0;
+			}
+		} else {
+			rval = -ENOTTY;
+		}
+		break;
+	case SI476X_IOC_GET_ACF:
+		if (radio->ops->acf_status)
+			rval = radio->ops->acf_status(radio->core,
+				(struct si476x_acf_status_report *)arg);
+		else
+			rval = -ENOTTY;
+		break;
+	case SI476X_IOC_GET_AGC:
+		if (radio->ops->agc_status)
+			rval = radio->ops->agc_status(radio->core,
+				(struct si476x_agc_status_report *)arg);
+		else
+			rval = -ENOTTY;
+		break;
+	case SI476X_IOC_GET_RDS_BLKCNT:
+		if (radio->ops->rds_blckcnt)
+			rval = radio->ops->rds_blckcnt(radio->core, true,
+				(struct si476x_rds_blockcount_report *)arg);
+		else
+			rval = -ENOTTY;
+		break;
+#ifndef CONFIG_VIDEO_ADV_DEBUG
+	case VIDIOC_DBG_G_REGISTER:
+		rval = __g_register(file, fh, arg);
+		break;
+	case VIDIOC_DBG_S_REGISTER:
+		rval = __s_register(file, fh, arg);
+		break;
+#endif
+	default:
+		/* nothing */
+		rval = -ENOTTY;
+		break;
+	}
+
+	si476x_core_unlock(radio->core);
+up_semaphore:
+	up_read(&radio->core_lock);
+	return rval;
+}
+
+static int si476x_radio_fops_open(struct file *file)
+{
+	int err;
+	struct si476x_radio *radio = video_drvdata(file);
+
+	si476x_radio_get(radio);
+
+	down_read(&radio->core_lock);
+
+	if (!radio->core) {
+		err = -ENODEV;
+		goto up_semaphore;
+	}
+
+	if (atomic_inc_return(&radio->core->users) == 1) {
+		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_initialize_mode(radio);
+		if (err < 0)
+			goto power_down;
+
+		si476x_core_unlock(radio->core);
+	} else {
+		err = 0;
+	}
+
+	up_read(&radio->core_lock);
+	return err;
+
+power_down:
+	si476x_core_set_power_state(radio->core,
+				    SI476X_POWER_DOWN);
+done:
+	si476x_core_unlock(radio->core);
+	atomic_dec(&radio->core->users);
+up_semaphore:
+	up_read(&radio->core_lock);
+	si476x_radio_put(radio);
+	return err;
+}
+
+static int si476x_radio_fops_release(struct file *file)
+{
+	int err;
+	struct si476x_radio *radio = video_drvdata(file);
+
+	down_read(&radio->core_lock);
+
+	if (!radio->core) {
+		err = -ENODEV;
+		goto up_semaphore;
+	}
+
+	if (atomic_dec_and_test(&radio->core->users)) {
+		err = si476x_core_set_power_state(radio->core,
+						  SI476X_POWER_DOWN);
+	} else {
+		err = 0;
+	}
+
+up_semaphore:
+	up_read(&radio->core_lock);
+	si476x_radio_put(radio);
+	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);
+
+	down_read(&radio->core_lock);
+
+	if (!radio->core) {
+		rval = -ENODEV;
+		goto up_semaphore;
+	}
+
+	/* block if no new data available */
+	if (kfifo_is_empty(&radio->core->rds_fifo)) {
+		if (file->f_flags & O_NONBLOCK) {
+			rval = -EWOULDBLOCK;
+			goto up_semaphore;
+		}
+		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) {
+			rval = -EINTR;
+			goto up_semaphore;
+		}
+		if (!atomic_read(&radio->core->is_alive)) {
+			rval = -ENODEV;
+			goto up_semaphore;
+		}
+	}
+
+	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 durnig FIFO to userspace copy\n");
+		rval = -EIO;
+	} else {
+		rval = (ssize_t)copied;
+	}
+
+up_semaphore:
+	up_read(&radio->core_lock);
+	return rval;
+}
+
+
+static unsigned int si476x_radio_fops_poll(struct file *file,
+				struct poll_table_struct *pts)
+{
+	int err;
+	struct si476x_radio *radio = video_drvdata(file);
+
+	down_read(&radio->core_lock);
+	if (!radio->core) {
+		err = POLLHUP;
+		goto up_semaphore;
+	}
+
+	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;
+
+up_semaphore:
+	up_read(&radio->core_lock);
+	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_querycap,
+	.vidioc_queryctrl	= si476x_queryctrl,
+	.vidioc_querymenu       = si476x_querymenu,
+	.vidioc_g_ctrl		= si476x_g_ctrl,
+	.vidioc_s_ctrl		= si476x_s_ctrl,
+	.vidioc_g_audio		= si476x_g_audio,
+	.vidioc_s_audio		= si476x_s_audio,
+	.vidioc_enumaudio	= si476x_enumaudio,
+	.vidioc_g_tuner		= si476x_g_tuner,
+
+	.vidioc_g_frequency	= si476x_g_frequency,
+	.vidioc_s_frequency	= si476x_s_frequency,
+	.vidioc_s_hw_freq_seek	= si476x_s_hw_freq_seek,
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+	.vidioc_g_register      = si476x_g_register,
+	.vidioc_s_register      = si476x_s_register,
+#endif
+	.vidioc_default         = si476x_default,
+};
+
+
+static const struct video_device si476x_viddev_template = {
+	.fops			= &si476x_fops,
+	.name			= DRIVER_NAME,
+	.release		= video_device_release,
+};
+
+
+static int si476x_radio_initialize_mode(struct si476x_radio *radio)
+{
+	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,
+	};
+
+	static const struct si476x_radio_ops none_ops = {
+		.tune_freq		= NULL,
+		.seek_start		= NULL,
+		.rsq_status		= NULL,
+		.rds_blckcnt		= NULL,
+		.phase_diversity	= NULL,
+		.phase_div_status	= NULL,
+		.acf_status		= NULL,
+		.agc_status		= NULL,
+	};
+
+	struct si476x_func_info info;
+	int retval;
+
+	retval = si476x_core_cmd_func_info(radio->core, &info);
+	if (retval < 0)
+		return retval;
+
+	switch (info.func) {
+	case SI476X_FUNC_FM_RECEIVER:
+		radio->ops = &fm_ops;
+		break;
+	case SI476X_FUNC_AM_RECEIVER:
+		radio->ops = &am_ops;
+		break;
+	default:
+		WARN(1, "Unexpected tuner function value\n"); /* FALLTHROUGH */
+	case SI476X_FUNC_WB_RECEIVER: /* FALLTHROUGH */
+	case SI476X_FUNC_BOOTLOADER:
+		radio->ops = &none_ops;
+		break;
+	}
+
+	return retval;
+}
+
+static int __devinit si476x_radio_probe(struct platform_device *pdev)
+{
+	int rval;
+	struct si476x_core **core = pdev->dev.platform_data;
+	struct si476x_radio *radio;
+
+	if (!core) {
+		dev_err(&pdev->dev, "No platform data.\n");
+		rval = -EINVAL;
+		goto exit;
+	}
+
+	radio = kzalloc(sizeof(*radio), GFP_KERNEL);
+	if (!radio) {
+		rval = -ENOMEM;
+		goto exit;
+	}
+
+	radio->core = *core;
+	si476x_core_get(radio->core);
+
+	radio->videodev = video_device_alloc();
+	if (!radio->videodev) {
+		dev_err(&pdev->dev, "Failed to alloc video device.\n");
+		rval = -ENOMEM;
+		goto free_radio;
+	}
+
+	memcpy(radio->videodev, &si476x_viddev_template,
+	       sizeof(struct video_device));
+	radio->videodev->ioctl_ops = &si4761_ioctl_ops;
+
+	/* tie this device to some physical hardware */
+	radio->videodev->parent = &pdev->dev;
+
+	video_set_drvdata(radio->videodev, radio);
+	platform_set_drvdata(pdev, radio);
+
+	/* register video device */
+	rval = video_register_device(radio->videodev, VFL_TYPE_RADIO, -1);
+
+	if (rval) {
+		dev_err(&pdev->dev, "Could not register video device\n");
+	} else {
+		init_rwsem(&radio->core_lock);
+		kref_init(&radio->kref);
+		/* si476x_debugfs_init(radio, id->name); */
+		return 0;
+	}
+
+free_radio:
+	kfree(radio);
+exit:
+	return rval;
+}
+
+static void si476x_radio_delete(struct kref *kref)
+{
+	struct si476x_radio *radio = kref_to_si476x_radio(kref);
+	kfree(radio);
+}
+
+
+static int si476x_radio_remove(struct platform_device *pdev)
+{
+	struct si476x_radio *radio = platform_get_drvdata(pdev);
+
+
+	video_unregister_device(radio->videodev);
+
+	down_write(&radio->core_lock);
+	si476x_core_put(radio->core);
+	radio->core = NULL;
+	up_write(&radio->core_lock);
+
+	si476x_radio_put(radio);
+
+	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@xxxxxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Driver for Si4761/64/68 AM/FM Radio MFD Cell");
+MODULE_LICENSE("GPL");
-- 
1.7.9.5

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