[media] v4l2: Add a V4L2 driver for SI476X MFD
authorAndrey Smirnov <andreysm@charmander.(none)>
Wed, 27 Mar 2013 01:47:26 +0000 (22:47 -0300)
committerMauro Carvalho Chehab <mchehab@redhat.com>
Fri, 29 Mar 2013 12:25:49 +0000 (09:25 -0300)
This commit adds a driver that exposes all the radio related
functionality of the Si476x series of chips via the V4L2 subsystem.

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Documentation/video4linux/si476x.txt [new file with mode: 0644]
drivers/media/radio/Kconfig
drivers/media/radio/Makefile
drivers/media/radio/radio-si476x.c [new file with mode: 0644]
include/media/si476x.h [new file with mode: 0644]

diff --git a/Documentation/video4linux/si476x.txt b/Documentation/video4linux/si476x.txt
new file mode 100644 (file)
index 0000000..d1a08db
--- /dev/null
@@ -0,0 +1,187 @@
+SI476x Driver Readme
+------------------------------------------------
+       Copyright (C) 2013 Andrey Smirnov <andrew.smirnov@gmail.com>
+
+TODO for the driver
+------------------------------
+
+- According to the SiLabs' datasheet it is possible to update the
+  firmware of the radio chip in the run-time, thus bringing it to the
+  most recent version. Unfortunately I couldn't find any mentioning of
+  the said firmware update for the old chips that I tested the driver
+  against, so for chips like that the driver only exposes the old
+  functionality.
+
+
+Parameters exposed over debugfs
+-------------------------------
+SI476x allow user to get multiple characteristics that can be very
+useful for EoL testing/RF performance estimation, parameters that have
+very little to do with V4L2 subsystem. Such parameters are exposed via
+debugfs and can be accessed via regular file I/O operations.
+
+The drivers exposes following files:
+
+* /sys/kernel/debug/<device-name>/acf
+  This file contains ACF(Automatically Controlled Features) status
+  information. The contents of the file is binary data of the
+  following layout:
+
+  Offset       | Name          | Description
+  ====================================================================
+  0x00         | blend_int     | Flag, set when stereo separation has
+               |               | crossed below the blend threshold
+  --------------------------------------------------------------------
+  0x01         | hblend_int    | Flag, set when HiBlend cutoff
+               |               | frequency is lower than threshold
+  --------------------------------------------------------------------
+  0x02         | hicut_int     | Flag, set when HiCut cutoff
+               |               | frequency is lower than threshold
+  --------------------------------------------------------------------
+  0x03         | chbw_int      | Flag, set when channel filter
+               |               | bandwidth is less than threshold
+  --------------------------------------------------------------------
+  0x04         | softmute_int  | Flag indicating that softmute
+               |               | attenuation has increased above
+               |               | softmute threshold
+  --------------------------------------------------------------------
+  0x05         | smute         | 0 - Audio is not soft muted
+               |               | 1 - Audio is soft muted
+  --------------------------------------------------------------------
+  0x06         | smattn        | Soft mute attenuation level in dB
+  --------------------------------------------------------------------
+  0x07         | chbw          | Channel filter bandwidth in kHz
+  --------------------------------------------------------------------
+  0x08         | hicut         | HiCut cutoff frequency in units of
+               |               | 100Hz
+  --------------------------------------------------------------------
+  0x09         | hiblend       | HiBlend cutoff frequency in units
+               |               | of 100 Hz
+  --------------------------------------------------------------------
+  0x10         | pilot         | 0 - Stereo pilot is not present
+               |               | 1 - Stereo pilot is present
+  --------------------------------------------------------------------
+  0x11         | stblend       | Stereo blend in %
+  --------------------------------------------------------------------
+
+
+* /sys/kernel/debug/<device-name>/rds_blckcnt
+  This file contains statistics about RDS receptions. It's binary data
+  has the following layout:
+
+  Offset       | Name          | Description
+  ====================================================================
+  0x00         | expected      | Number of expected RDS blocks
+  --------------------------------------------------------------------
+  0x02         | received      | Number of received RDS blocks
+  --------------------------------------------------------------------
+  0x04         | uncorrectable | Number of uncorrectable RDS blocks
+  --------------------------------------------------------------------
+
+* /sys/kernel/debug/<device-name>/agc
+  This file contains information about parameters pertaining to
+  AGC(Automatic Gain Control)
+
+  The layout is:
+  Offset       | Name          | Description
+  ====================================================================
+  0x00         | mxhi          | 0 - FM Mixer PD high threshold is
+               |               | not tripped
+               |               | 1 - FM Mixer PD high threshold is
+               |               | tripped
+  --------------------------------------------------------------------
+  0x01         | mxlo          | ditto for FM Mixer PD low
+  --------------------------------------------------------------------
+  0x02         | lnahi         | ditto for FM LNA PD high
+  --------------------------------------------------------------------
+  0x03         | lnalo         | ditto for FM LNA PD low
+  --------------------------------------------------------------------
+  0x04         | fmagc1        | FMAGC1 attenuator resistance
+               |               | (see datasheet for more detail)
+  --------------------------------------------------------------------
+  0x05         | fmagc2        | ditto for FMAGC2
+  --------------------------------------------------------------------
+  0x06         | pgagain       | PGA gain in dB
+  --------------------------------------------------------------------
+  0x07         | fmwblang      | FM/WB LNA Gain in dB
+  --------------------------------------------------------------------
+
+* /sys/kernel/debug/<device-name>/rsq
+  This file contains information about parameters pertaining to
+  RSQ(Received Signal Quality)
+
+  The layout is:
+  Offset       | Name          | Description
+  ====================================================================
+  0x00         | multhint      | 0 - multipath value has not crossed
+               |               | the Multipath high threshold
+               |               | 1 - multipath value has crossed
+               |               | the Multipath high threshold
+  --------------------------------------------------------------------
+  0x01         | multlint      | ditto for Multipath low threshold
+  --------------------------------------------------------------------
+  0x02         | snrhint       | 0 - received signal's SNR has not
+               |               | crossed high threshold
+               |               | 1 - received signal's SNR has
+               |               | crossed high threshold
+  --------------------------------------------------------------------
+  0x03         | snrlint       | ditto for low threshold
+  --------------------------------------------------------------------
+  0x04         | rssihint      | ditto for RSSI high threshold
+  --------------------------------------------------------------------
+  0x05         | rssilint      | ditto for RSSI low threshold
+  --------------------------------------------------------------------
+  0x06         | bltf          | Flag indicating if seek command
+               |               | reached/wrapped seek band limit
+  --------------------------------------------------------------------
+  0x07         | snr_ready     | Indicates that SNR metrics is ready
+  --------------------------------------------------------------------
+  0x08         | rssiready     | ditto for RSSI metrics
+  --------------------------------------------------------------------
+  0x09         | injside       | 0 - Low-side injection is being used
+               |               | 1 - High-side injection is used
+  --------------------------------------------------------------------
+  0x10         | afcrl         | Flag indicating if AFC rails
+  --------------------------------------------------------------------
+  0x11         | valid         | Flag indicating if channel is valid
+  --------------------------------------------------------------------
+  0x12         | readfreq      | Current tuned frequency
+  --------------------------------------------------------------------
+  0x14         | freqoff       | Singed frequency offset in units of
+               |               | 2ppm
+  --------------------------------------------------------------------
+  0x15         | rssi          | Signed value of RSSI in dBuV
+  --------------------------------------------------------------------
+  0x16         | snr           | Signed RF SNR in dB
+  --------------------------------------------------------------------
+  0x17         | issi          | Signed Image Strength Signal
+               |               | indicator
+  --------------------------------------------------------------------
+  0x18         | lassi         | Signed Low side adjacent Channel
+               |               | Strength indicator
+  --------------------------------------------------------------------
+  0x19         | hassi         | ditto fpr High side
+  --------------------------------------------------------------------
+  0x20         | mult          | Multipath indicator
+  --------------------------------------------------------------------
+  0x21         | dev           | Frequency deviation
+  --------------------------------------------------------------------
+  0x24         | assi          | Adjascent channel SSI
+  --------------------------------------------------------------------
+  0x25         | usn           | Ultrasonic noise indicator
+  --------------------------------------------------------------------
+  0x26         | pilotdev      | Pilot deviation in units of 100 Hz
+  --------------------------------------------------------------------
+  0x27         | rdsdev        | ditto for RDS
+  --------------------------------------------------------------------
+  0x28         | assidev       | ditto for ASSI
+  --------------------------------------------------------------------
+  0x29         | strongdev     | Frequency deviation
+  --------------------------------------------------------------------
+  0x30         | rdspi         | RDS PI code
+  --------------------------------------------------------------------
+
+* /sys/kernel/debug/<device-name>/rsq_primary
+  This file contains information about parameters pertaining to
+  RSQ(Received Signal Quality) for primary tuner only. Layout is as
+  the one above.
index 24e64a09884cb8858c713bdc373cdd593840b855..28ded247abc007ab129bd4cc18e95f3eec18a912 100644 (file)
@@ -18,6 +18,23 @@ config RADIO_SI470X
 
 source "drivers/media/radio/si470x/Kconfig"
 
+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.
+
 config USB_MR800
        tristate "AverMedia MR 800 USB FM radio support"
        depends on USB && VIDEO_V4L2
index 303eaebdb85a7d2f0e02fb17645594b372be160c..0dcdb320cfc74db557f8b3ec8b7037e6bc46f7f5 100644 (file)
@@ -19,6 +19,7 @@ obj-$(CONFIG_RADIO_GEMTEK) += radio-gemtek.o
 obj-$(CONFIG_RADIO_TRUST) += radio-trust.o
 obj-$(CONFIG_I2C_SI4713) += si4713-i2c.o
 obj-$(CONFIG_RADIO_SI4713) += radio-si4713.o
+obj-$(CONFIG_RADIO_SI476X) += radio-si476x.o
 obj-$(CONFIG_RADIO_MIROPCM20) += radio-miropcm20.o
 obj-$(CONFIG_USB_DSBR) += dsbr100.o
 obj-$(CONFIG_RADIO_SI470X) += si470x/
diff --git a/drivers/media/radio/radio-si476x.c b/drivers/media/radio/radio-si476x.c
new file mode 100644 (file)
index 0000000..0895a0c
--- /dev/null
@@ -0,0 +1,1599 @@
+/*
+ * 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/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) (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;
+}
+
+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 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 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;
+}
+
+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);
+       unsigned 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 si476x_radio_init_debugfs(struct si476x_radio *radio)
+{
+       struct dentry   *dentry;
+       int             ret;
+
+       dentry = debugfs_create_dir(dev_name(radio->v4l2dev.dev), NULL);
+       if (IS_ERR(dentry)) {
+               ret = PTR_ERR(dentry);
+               goto exit;
+       }
+       radio->debugfs = dentry;
+
+       dentry = debugfs_create_file("acf", S_IRUGO,
+                                    radio->debugfs, radio, &radio_acf_fops);
+       if (IS_ERR(dentry)) {
+               ret = PTR_ERR(dentry);
+               goto cleanup;
+       }
+
+       dentry = debugfs_create_file("rds_blckcnt", S_IRUGO,
+                                    radio->debugfs, radio,
+                                    &radio_rds_blckcnt_fops);
+       if (IS_ERR(dentry)) {
+               ret = PTR_ERR(dentry);
+               goto cleanup;
+       }
+
+       dentry = debugfs_create_file("agc", S_IRUGO,
+                                    radio->debugfs, radio, &radio_agc_fops);
+       if (IS_ERR(dentry)) {
+               ret = PTR_ERR(dentry);
+               goto cleanup;
+       }
+
+       dentry = debugfs_create_file("rsq", S_IRUGO,
+                                    radio->debugfs, radio, &radio_rsq_fops);
+       if (IS_ERR(dentry)) {
+               ret = PTR_ERR(dentry);
+               goto cleanup;
+       }
+
+       dentry = debugfs_create_file("rsq_primary", S_IRUGO,
+                                    radio->debugfs, radio,
+                                    &radio_rsq_primary_fops);
+       if (IS_ERR(dentry)) {
+               ret = PTR_ERR(dentry);
+               goto cleanup;
+       }
+
+       return 0;
+cleanup:
+       debugfs_remove_recursive(radio->debugfs);
+exit:
+       return ret;
+}
+
+
+static int si476x_radio_add_new_custom(struct si476x_radio *radio,
+                                      enum si476x_ctrl_idx idx)
+{
+       int rval;
+       struct v4l2_ctrl *ctrl;
+
+       ctrl = v4l2_ctrl_new_custom(&radio->ctrl_handler,
+                                   &si476x_ctrls[idx],
+                                   NULL);
+       rval = radio->ctrl_handler.error;
+       if (ctrl == NULL && rval)
+               dev_err(radio->v4l2dev.dev,
+                       "Could not initialize '%s' control %d\n",
+                       si476x_ctrls[idx].name, rval);
+
+       return rval;
+}
+
+static int si476x_radio_probe(struct platform_device *pdev)
+{
+       int rval;
+       struct si476x_radio *radio;
+       struct v4l2_ctrl *ctrl;
+
+       static atomic_t instance = ATOMIC_INIT(0);
+
+       radio = devm_kzalloc(&pdev->dev, sizeof(*radio), GFP_KERNEL);
+       if (!radio)
+               return -ENOMEM;
+
+       radio->core = i2c_mfd_cell_to_core(&pdev->dev);
+
+       v4l2_device_set_name(&radio->v4l2dev, DRIVER_NAME, &instance);
+
+       rval = v4l2_device_register(&pdev->dev, &radio->v4l2dev);
+       if (rval) {
+               dev_err(&pdev->dev, "Cannot register v4l2_device.\n");
+               return rval;
+       }
+
+       memcpy(&radio->videodev, &si476x_viddev_template,
+              sizeof(struct video_device));
+
+       radio->videodev.v4l2_dev  = &radio->v4l2dev;
+       radio->videodev.ioctl_ops = &si4761_ioctl_ops;
+
+       video_set_drvdata(&radio->videodev, radio);
+       platform_set_drvdata(pdev, radio);
+
+       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)) {
+               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);
+               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 = {
+       .driver         = {
+               .name   = DRIVER_NAME,
+               .owner  = THIS_MODULE,
+       },
+       .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");
diff --git a/include/media/si476x.h b/include/media/si476x.h
new file mode 100644 (file)
index 0000000..beb6433
--- /dev/null
@@ -0,0 +1,426 @@
+/*
+ * include/media/si476x.h -- Common definitions for si476x driver
+ *
+ * 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.
+ *
+ */
+
+#ifndef SI476X_H
+#define SI476X_H
+
+#include <linux/types.h>
+#include <linux/videodev2.h>
+
+struct si476x_device;
+
+/* It is possible to select one of the four adresses using pins A0
+ * and A1 on SI476x */
+#define SI476X_I2C_ADDR_1      0x60
+#define SI476X_I2C_ADDR_2      0x61
+#define SI476X_I2C_ADDR_3      0x62
+#define SI476X_I2C_ADDR_4      0x63
+
+enum si476x_iqclk_config {
+       SI476X_IQCLK_NOOP = 0,
+       SI476X_IQCLK_TRISTATE = 1,
+       SI476X_IQCLK_IQ = 21,
+};
+enum si476x_iqfs_config {
+       SI476X_IQFS_NOOP = 0,
+       SI476X_IQFS_TRISTATE = 1,
+       SI476X_IQFS_IQ = 21,
+};
+enum si476x_iout_config {
+       SI476X_IOUT_NOOP = 0,
+       SI476X_IOUT_TRISTATE = 1,
+       SI476X_IOUT_OUTPUT = 22,
+};
+enum si476x_qout_config {
+       SI476X_QOUT_NOOP = 0,
+       SI476X_QOUT_TRISTATE = 1,
+       SI476X_QOUT_OUTPUT = 22,
+};
+
+enum si476x_dclk_config {
+       SI476X_DCLK_NOOP      = 0,
+       SI476X_DCLK_TRISTATE  = 1,
+       SI476X_DCLK_DAUDIO    = 10,
+};
+
+enum si476x_dfs_config {
+       SI476X_DFS_NOOP      = 0,
+       SI476X_DFS_TRISTATE  = 1,
+       SI476X_DFS_DAUDIO    = 10,
+};
+
+enum si476x_dout_config {
+       SI476X_DOUT_NOOP       = 0,
+       SI476X_DOUT_TRISTATE   = 1,
+       SI476X_DOUT_I2S_OUTPUT = 12,
+       SI476X_DOUT_I2S_INPUT  = 13,
+};
+
+enum si476x_xout_config {
+       SI476X_XOUT_NOOP        = 0,
+       SI476X_XOUT_TRISTATE    = 1,
+       SI476X_XOUT_I2S_INPUT   = 13,
+       SI476X_XOUT_MODE_SELECT = 23,
+};
+
+
+enum si476x_icin_config {
+       SI476X_ICIN_NOOP        = 0,
+       SI476X_ICIN_TRISTATE    = 1,
+       SI476X_ICIN_GPO1_HIGH   = 2,
+       SI476X_ICIN_GPO1_LOW    = 3,
+       SI476X_ICIN_IC_LINK     = 30,
+};
+
+enum si476x_icip_config {
+       SI476X_ICIP_NOOP        = 0,
+       SI476X_ICIP_TRISTATE    = 1,
+       SI476X_ICIP_GPO2_HIGH   = 2,
+       SI476X_ICIP_GPO2_LOW    = 3,
+       SI476X_ICIP_IC_LINK     = 30,
+};
+
+enum si476x_icon_config {
+       SI476X_ICON_NOOP        = 0,
+       SI476X_ICON_TRISTATE    = 1,
+       SI476X_ICON_I2S         = 10,
+       SI476X_ICON_IC_LINK     = 30,
+};
+
+enum si476x_icop_config {
+       SI476X_ICOP_NOOP        = 0,
+       SI476X_ICOP_TRISTATE    = 1,
+       SI476X_ICOP_I2S         = 10,
+       SI476X_ICOP_IC_LINK     = 30,
+};
+
+
+enum si476x_lrout_config {
+       SI476X_LROUT_NOOP       = 0,
+       SI476X_LROUT_TRISTATE   = 1,
+       SI476X_LROUT_AUDIO      = 2,
+       SI476X_LROUT_MPX        = 3,
+};
+
+
+enum si476x_intb_config {
+       SI476X_INTB_NOOP     = 0,
+       SI476X_INTB_TRISTATE = 1,
+       SI476X_INTB_DAUDIO   = 10,
+       SI476X_INTB_IRQ      = 40,
+};
+
+enum si476x_a1_config {
+       SI476X_A1_NOOP     = 0,
+       SI476X_A1_TRISTATE = 1,
+       SI476X_A1_IRQ      = 40,
+};
+
+enum si476x_part_revisions {
+       SI476X_REVISION_A10 = 0,
+       SI476X_REVISION_A20 = 1,
+       SI476X_REVISION_A30 = 2,
+};
+
+struct si476x_pinmux {
+       enum si476x_dclk_config  dclk;
+       enum si476x_dfs_config   dfs;
+       enum si476x_dout_config  dout;
+       enum si476x_xout_config  xout;
+
+       enum si476x_iqclk_config iqclk;
+       enum si476x_iqfs_config  iqfs;
+       enum si476x_iout_config  iout;
+       enum si476x_qout_config  qout;
+
+       enum si476x_icin_config  icin;
+       enum si476x_icip_config  icip;
+       enum si476x_icon_config  icon;
+       enum si476x_icop_config  icop;
+
+       enum si476x_lrout_config lrout;
+
+       enum si476x_intb_config  intb;
+       enum si476x_a1_config    a1;
+};
+
+/**
+ * enum si476x_phase_diversity_mode - possbile phase diversity modes
+ * for SI4764/5/6/7 chips.
+ *
+ * @SI476X_PHDIV_DISABLED:             Phase diversity feature is
+ *                                     disabled.
+ * @SI476X_PHDIV_PRIMARY_COMBINING:    Tuner works as a primary tuner
+ *                                     in combination with a
+ *                                     secondary one.
+ * @SI476X_PHDIV_PRIMARY_ANTENNA:      Tuner works as a primary tuner
+ *                                     using only its own antenna.
+ * @SI476X_PHDIV_SECONDARY_ANTENNA:    Tuner works as a primary tuner
+ *                                     usning seconary tuner's antenna.
+ * @SI476X_PHDIV_SECONDARY_COMBINING:  Tuner works as a secondary
+ *                                     tuner in combination with the
+ *                                     primary one.
+ */
+enum si476x_phase_diversity_mode {
+       SI476X_PHDIV_DISABLED                   = 0,
+       SI476X_PHDIV_PRIMARY_COMBINING          = 1,
+       SI476X_PHDIV_PRIMARY_ANTENNA            = 2,
+       SI476X_PHDIV_SECONDARY_ANTENNA          = 3,
+       SI476X_PHDIV_SECONDARY_COMBINING        = 5,
+};
+
+enum si476x_ibias6x {
+       SI476X_IBIAS6X_OTHER                    = 0,
+       SI476X_IBIAS6X_RCVR1_NON_4MHZ_CLK       = 1,
+};
+
+enum si476x_xstart {
+       SI476X_XSTART_MULTIPLE_TUNER    = 0x11,
+       SI476X_XSTART_NORMAL            = 0x77,
+};
+
+enum si476x_freq {
+       SI476X_FREQ_4_MHZ               = 0,
+       SI476X_FREQ_37P209375_MHZ       = 1,
+       SI476X_FREQ_36P4_MHZ            = 2,
+       SI476X_FREQ_37P8_MHZ            =  3,
+};
+
+enum si476x_xmode {
+       SI476X_XMODE_CRYSTAL_RCVR1      = 1,
+       SI476X_XMODE_EXT_CLOCK          = 2,
+       SI476X_XMODE_CRYSTAL_RCVR2_3    = 3,
+};
+
+enum si476x_xbiashc {
+       SI476X_XBIASHC_SINGLE_RECEIVER = 0,
+       SI476X_XBIASHC_MULTIPLE_RECEIVER = 1,
+};
+
+enum si476x_xbias {
+       SI476X_XBIAS_RCVR2_3    = 0,
+       SI476X_XBIAS_4MHZ_RCVR1 = 3,
+       SI476X_XBIAS_RCVR1      = 7,
+};
+
+enum si476x_func {
+       SI476X_FUNC_BOOTLOADER  = 0,
+       SI476X_FUNC_FM_RECEIVER = 1,
+       SI476X_FUNC_AM_RECEIVER = 2,
+       SI476X_FUNC_WB_RECEIVER = 3,
+};
+
+
+/**
+ * @xcload: Selects the amount of additional on-chip capacitance to
+ *          be connected between XTAL1 and gnd and between XTAL2 and
+ *          GND. One half of the capacitance value shown here is the
+ *          additional load capacitance presented to the xtal. The
+ *          minimum step size is 0.277 pF. Recommended value is 0x28
+ *          but it will be layout dependent. Range is 0–0x3F i.e.
+ *          (0–16.33 pF)
+ * @ctsien: enable CTSINT(interrupt request when CTS condition
+ *          arises) when set
+ * @intsel: when set A1 pin becomes the interrupt pin; otherwise,
+ *          INTB is the interrupt pin
+ * @func:   selects the boot function of the device. I.e.
+ *          SI476X_BOOTLOADER  - Boot loader
+ *          SI476X_FM_RECEIVER - FM receiver
+ *          SI476X_AM_RECEIVER - AM receiver
+ *          SI476X_WB_RECEIVER - Weatherband receiver
+ * @freq:   oscillator's crystal frequency:
+ *          SI476X_XTAL_37P209375_MHZ - 37.209375 Mhz
+ *          SI476X_XTAL_36P4_MHZ      - 36.4 Mhz
+ *          SI476X_XTAL_37P8_MHZ      - 37.8 Mhz
+ */
+struct si476x_power_up_args {
+       enum si476x_ibias6x ibias6x;
+       enum si476x_xstart  xstart;
+       u8   xcload;
+       bool fastboot;
+       enum si476x_xbiashc xbiashc;
+       enum si476x_xbias   xbias;
+       enum si476x_func    func;
+       enum si476x_freq    freq;
+       enum si476x_xmode   xmode;
+};
+
+
+enum si476x_ctrl_id {
+       V4L2_CID_SI476X_RSSI_THRESHOLD  = (V4L2_CID_USER_SI476X_BASE + 1),
+       V4L2_CID_SI476X_SNR_THRESHOLD   = (V4L2_CID_USER_SI476X_BASE + 2),
+       V4L2_CID_SI476X_MAX_TUNE_ERROR  = (V4L2_CID_USER_SI476X_BASE + 3),
+       V4L2_CID_SI476X_HARMONICS_COUNT = (V4L2_CID_USER_SI476X_BASE + 4),
+       V4L2_CID_SI476X_DIVERSITY_MODE  = (V4L2_CID_USER_SI476X_BASE + 5),
+       V4L2_CID_SI476X_INTERCHIP_LINK  = (V4L2_CID_USER_SI476X_BASE + 6),
+};
+
+/*
+ * Platform dependent definition
+ */
+struct si476x_platform_data {
+       int gpio_reset; /* < 0 if not used */
+
+       struct si476x_power_up_args power_up_parameters;
+       enum si476x_phase_diversity_mode diversity_mode;
+
+       struct si476x_pinmux pinmux;
+};
+
+/**
+ * struct si476x_rsq_status - structure containing received signal
+ * quality
+ * @multhint:   Multipath Detect High.
+ *              true  - Indicatedes that the value is below
+ *                      FM_RSQ_MULTIPATH_HIGH_THRESHOLD
+ *              false - Indicatedes that the value is above
+ *                      FM_RSQ_MULTIPATH_HIGH_THRESHOLD
+ * @multlint:   Multipath Detect Low.
+ *              true  - Indicatedes that the value is below
+ *                      FM_RSQ_MULTIPATH_LOW_THRESHOLD
+ *              false - Indicatedes that the value is above
+ *                      FM_RSQ_MULTIPATH_LOW_THRESHOLD
+ * @snrhint:    SNR Detect High.
+ *              true  - Indicatedes that the value is below
+ *                      FM_RSQ_SNR_HIGH_THRESHOLD
+ *              false - Indicatedes that the value is above
+ *                      FM_RSQ_SNR_HIGH_THRESHOLD
+ * @snrlint:    SNR Detect Low.
+ *              true  - Indicatedes that the value is below
+ *                      FM_RSQ_SNR_LOW_THRESHOLD
+ *              false - Indicatedes that the value is above
+ *                      FM_RSQ_SNR_LOW_THRESHOLD
+ * @rssihint:   RSSI Detect High.
+ *              true  - Indicatedes that the value is below
+ *                      FM_RSQ_RSSI_HIGH_THRESHOLD
+ *              false - Indicatedes that the value is above
+ *                      FM_RSQ_RSSI_HIGH_THRESHOLD
+ * @rssilint:   RSSI Detect Low.
+ *              true  - Indicatedes that the value is below
+ *                      FM_RSQ_RSSI_LOW_THRESHOLD
+ *              false - Indicatedes that the value is above
+ *                      FM_RSQ_RSSI_LOW_THRESHOLD
+ * @bltf:       Band Limit.
+ *              Set if seek command hits the band limit or wrapped to
+ *              the original frequency.
+ * @snr_ready:  SNR measurement in progress.
+ * @rssiready:  RSSI measurement in progress.
+ * @afcrl:      Set if FREQOFF >= MAX_TUNE_ERROR
+ * @valid:      Set if the channel is valid
+ *               rssi < FM_VALID_RSSI_THRESHOLD
+ *               snr  < FM_VALID_SNR_THRESHOLD
+ *               tune_error < FM_VALID_MAX_TUNE_ERROR
+ * @readfreq:   Current tuned frequency.
+ * @freqoff:    Signed frequency offset.
+ * @rssi:       Received Signal Strength Indicator(dBuV).
+ * @snr:        RF SNR Indicator(dB).
+ * @lassi:
+ * @hassi:      Low/High side Adjacent(100 kHz) Channel Strength Indicator
+ * @mult:       Multipath indicator
+ * @dev:        Who knows? But values may vary.
+ * @readantcap: Antenna tuning capacity value.
+ * @assi:       Adjacent Channel(+/- 200kHz) Strength Indicator
+ * @usn:        Ultrasonic Noise Inticator in -DBFS
+ */
+struct si476x_rsq_status_report {
+       __u8 multhint, multlint;
+       __u8 snrhint,  snrlint;
+       __u8 rssihint, rssilint;
+       __u8 bltf;
+       __u8 snr_ready;
+       __u8 rssiready;
+       __u8 injside;
+       __u8 afcrl;
+       __u8 valid;
+
+       __u16 readfreq;
+       __s8  freqoff;
+       __s8  rssi;
+       __s8  snr;
+       __s8  issi;
+       __s8  lassi, hassi;
+       __s8  mult;
+       __u8  dev;
+       __u16 readantcap;
+       __s8  assi;
+       __s8  usn;
+
+       __u8 pilotdev;
+       __u8 rdsdev;
+       __u8 assidev;
+       __u8 strongdev;
+       __u16 rdspi;
+} __packed;
+
+/**
+ * si476x_acf_status_report - ACF report results
+ *
+ * @blend_int: If set, indicates that stereo separation has crossed
+ * below the blend threshold as set by FM_ACF_BLEND_THRESHOLD
+ * @hblend_int: If set, indicates that HiBlend cutoff frequency is
+ * lower than threshold as set by FM_ACF_HBLEND_THRESHOLD
+ * @hicut_int:  If set, indicates that HiCut cutoff frequency is lower
+ * than the threshold set by ACF_
+
+ */
+struct si476x_acf_status_report {
+       __u8 blend_int;
+       __u8 hblend_int;
+       __u8 hicut_int;
+       __u8 chbw_int;
+       __u8 softmute_int;
+       __u8 smute;
+       __u8 smattn;
+       __u8 chbw;
+       __u8 hicut;
+       __u8 hiblend;
+       __u8 pilot;
+       __u8 stblend;
+} __packed;
+
+enum si476x_fmagc {
+       SI476X_FMAGC_10K_OHM    = 0,
+       SI476X_FMAGC_800_OHM    = 1,
+       SI476X_FMAGC_400_OHM    = 2,
+       SI476X_FMAGC_200_OHM    = 4,
+       SI476X_FMAGC_100_OHM    = 8,
+       SI476X_FMAGC_50_OHM     = 16,
+       SI476X_FMAGC_25_OHM     = 32,
+       SI476X_FMAGC_12P5_OHM   = 64,
+       SI476X_FMAGC_6P25_OHM   = 128,
+};
+
+struct si476x_agc_status_report {
+       __u8 mxhi;
+       __u8 mxlo;
+       __u8 lnahi;
+       __u8 lnalo;
+       __u8 fmagc1;
+       __u8 fmagc2;
+       __u8 pgagain;
+       __u8 fmwblang;
+} __packed;
+
+struct si476x_rds_blockcount_report {
+       __u16 expected;
+       __u16 received;
+       __u16 uncorrectable;
+} __packed;
+
+#endif /* SI476X_H*/