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Message-Id: <1366304318-29620-10-git-send-email-andrew.smirnov@gmail.com>
Date: Thu, 18 Apr 2013 09:58:35 -0700
From: Andrey Smirnov <andrew.smirnov@...il.com>
To: sameo@...ux.intel.com
Cc: mchehab@...hat.com, andrew.smirnov@...il.com, hverkuil@...all.nl,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 09/12] v4l2: Add a V4L2 driver for SI476X MFD
From: Andrey Smirnov <andreysm@...rmander.(none)>
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@...co.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
---
Documentation/video4linux/si476x.txt | 187 ++++
drivers/media/radio/Kconfig | 17 +
drivers/media/radio/Makefile | 1 +
drivers/media/radio/radio-si476x.c | 1599 ++++++++++++++++++++++++++++++++++
include/media/si476x.h | 37 +
5 files changed, 1841 insertions(+)
create mode 100644 Documentation/video4linux/si476x.txt
create mode 100644 drivers/media/radio/radio-si476x.c
create mode 100644 include/media/si476x.h
diff --git a/Documentation/video4linux/si476x.txt b/Documentation/video4linux/si476x.txt
new file mode 100644
index 0000000..d1a08db
--- /dev/null
+++ b/Documentation/video4linux/si476x.txt
@@ -0,0 +1,187 @@
+SI476x Driver Readme
+------------------------------------------------
+ Copyright (C) 2013 Andrey Smirnov <andrew.smirnov@...il.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.
diff --git a/drivers/media/radio/Kconfig b/drivers/media/radio/Kconfig
index ead9928..170460d 100644
--- a/drivers/media/radio/Kconfig
+++ b/drivers/media/radio/Kconfig
@@ -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
diff --git a/drivers/media/radio/Makefile b/drivers/media/radio/Makefile
index 303eaeb..0dcdb32 100644
--- a/drivers/media/radio/Makefile
+++ b/drivers/media/radio/Makefile
@@ -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
index 0000000..0895a0c
--- /dev/null
+++ b/drivers/media/radio/radio-si476x.c
@@ -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@...il.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@...il.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
index 0000000..e02e241
--- /dev/null
+++ b/include/media/si476x.h
@@ -0,0 +1,37 @@
+/*
+ * 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@...il.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>
+
+#include <linux/mfd/si476x-reports.h>
+
+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),
+};
+
+#endif /* SI476X_H*/
--
1.7.10.4
--
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