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Subject[PATCH v4 1/7] mfd: Add header files and Kbuild plumbing for SI476x MFD core
Date
From: Andrey Smirnov <andreysm@charmander.(none)>

This patch adds all necessary header files and Kbuild plumbing for the
core driver for Silicon Laboratories Si476x series of AM/FM tuner
chips.

The driver as a whole is implemented as an MFD device and this patch
adds a core portion of it that provides all the necessary
functionality to the two other drivers that represent radio and audio
codec subsystems of the chip.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
drivers/mfd/Kconfig | 13 +
drivers/mfd/Makefile | 4 +
include/linux/mfd/si476x-core.h | 525 +++++++++++++++++++++++++++++++++++++++
3 files changed, 542 insertions(+)
create mode 100644 include/linux/mfd/si476x-core.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 1c0abd4..3214927 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -970,6 +970,19 @@ config MFD_WL1273_CORE
driver connects the radio-wl1273 V4L2 module and the wl1273
audio codec.

+config MFD_SI476X_CORE
+ tristate "Support for Silicon Laboratories 4761/64/68 AM/FM radio."
+ depends on I2C
+ select MFD_CORE
+ default n
+ help
+ This is the core driver for the SI476x series of AM/FM
+ radio. This MFD driver connects the radio-si476x V4L2 module
+ and the si476x audio codec.
+
+ To compile this driver as a module, choose M here: the
+ module will be called si476x-core.
+
config MFD_OMAP_USB_HOST
bool "Support OMAP USBHS core and TLL driver"
depends on USB_EHCI_HCD_OMAP || USB_OHCI_HCD_OMAP3
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 8b977f8..bf7627b 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -131,6 +131,10 @@ obj-$(CONFIG_MFD_JZ4740_ADC) += jz4740-adc.o
obj-$(CONFIG_MFD_TPS6586X) += tps6586x.o
obj-$(CONFIG_MFD_VX855) += vx855.o
obj-$(CONFIG_MFD_WL1273_CORE) += wl1273-core.o
+
+si476x-core-objs := si476x-cmd.o si476x-prop.o si476x-i2c.o
+obj-$(CONFIG_MFD_SI476X_CORE) += si476x-core.o
+
obj-$(CONFIG_MFD_CS5535) += cs5535-mfd.o
obj-$(CONFIG_MFD_OMAP_USB_HOST) += omap-usb-host.o omap-usb-tll.o
obj-$(CONFIG_MFD_PM8921_CORE) += pm8921-core.o
diff --git a/include/linux/mfd/si476x-core.h b/include/linux/mfd/si476x-core.h
new file mode 100644
index 0000000..2136b26
--- /dev/null
+++ b/include/linux/mfd/si476x-core.h
@@ -0,0 +1,525 @@
+/*
+ * include/media/si476x-core.h -- Common definitions for si476x core
+ * device
+ *
+ * Copyright (C) 2012 Innovative Converged Devices(ICD)
+ *
+ * Author: Andrey Smirnov <andrey.smirnov@convergeddevices.net>
+ *
+ * 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_CORE_H
+#define SI476X_CORE_H
+
+#include <linux/kfifo.h>
+#include <linux/atomic.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/mutex.h>
+#include <linux/mfd/core.h>
+#include <linux/videodev2.h>
+#include <linux/regulator/consumer.h>
+
+#include <media/si476x.h>
+
+/* Command Timeouts */
+#define SI476X_DEFAULT_TIMEOUT 100000
+#define SI476X_TIMEOUT_TUNE 700000
+#define SI476X_TIMEOUT_POWER_UP 330000
+#define SI476X_STATUS_POLL_US 0
+
+/* -------------------- si476x-i2c.c ----------------------- */
+
+enum si476x_freq_supported_chips {
+ SI476X_CHIP_SI4761 = 1,
+ SI476X_CHIP_SI4764,
+ SI476X_CHIP_SI4768,
+};
+
+enum si476x_mfd_cells {
+ SI476X_RADIO_CELL = 0,
+ SI476X_CODEC_CELL,
+ SI476X_MFD_CELLS,
+};
+
+/**
+ * enum si476x_power_state - possible power state of the si476x
+ * device.
+ *
+ * @SI476X_POWER_DOWN: In this state all regulators are turned off
+ * and the reset line is pulled low. The device is completely
+ * inactive.
+ * @SI476X_POWER_UP_FULL: In this state all the power regualtors are
+ * turned on, reset line pulled high, IRQ line is enabled(polling is
+ * active for polling use scenario) and device is turned on with
+ * POWER_UP command. The device is ready to be used.
+ * @SI476X_POWER_INCONSISTENT: This state indicates that previous
+ * power down was inconsistent, meaning some of the regulators were
+ * not turned down and thus use of the device, without power-cycling
+ * is impossible.
+ */
+enum si476x_power_state {
+ SI476X_POWER_DOWN = 0,
+ SI476X_POWER_UP_FULL = 1,
+ SI476X_POWER_INCONSISTENT = 2,
+};
+
+/**
+ * struct si476x_core - internal data structure representing the
+ * underlying "core" device which all the MFD cell-devices use.
+ *
+ * @client: Actual I2C client used to transfer commands to the chip.
+ * @chip_id: Last digit of the chip model(E.g. "1" for SI4761)
+ * @cells: MFD cell devices created by this driver.
+ * @cmd_lock: Mutex used to serialize all the requests to the core
+ * device. This filed should not be used directly. Instead
+ * si476x_core_lock()/si476x_core_unlock() should be used to get
+ * exclusive access to the "core" device.
+ * @users: Active users counter(Used by the radio cell)
+ * @rds_read_queue: Wait queue used to wait for RDS data.
+ * @rds_fifo: FIFO in which all the RDS data received from the chip is
+ * placed.
+ * @rds_fifo_drainer: Worker that drains on-chip RDS FIFO.
+ * @rds_drainer_is_working: Flag used for launching only one instance
+ * of the @rds_fifo_drainer.
+ * @rds_drainer_status_lock: Lock used to guard access to the
+ * @rds_drainer_is_working variable.
+ * @command: Wait queue for wainting on the command comapletion.
+ * @cts: Clear To Send flag set upon receiving first status with CTS
+ * set.
+ * @tuning: Wait queue used for wainting for tune/seek comand
+ * completion.
+ * @stc: Similar to @cts, but for the STC bit of the status value.
+ * @power_up_parameters: Parameters used as argument for POWER_UP
+ * command when the device is started.
+ * @state: Current power state of the device.
+ * @supplues: Structure containing handles to all power supplies used
+ * by the device (NULL ones are ignored).
+ * @gpio_reset: GPIO pin connectet to the RSTB pin of the chip.
+ * @pinmux: Chip's configurable pins configuration.
+ * @diversity_mode: Chips role when functioning in diversity mode.
+ * @status_monitor: Polling worker used in polling use case scenarion
+ * (when IRQ is not avalible).
+ * @revision: Chip's running firmware revision number(Used for correct
+ * command set support).
+ */
+
+struct si476x_core {
+ struct i2c_client *client;
+ struct regmap *regmap;
+ int chip_id;
+ struct mfd_cell cells[SI476X_MFD_CELLS];
+
+ struct mutex cmd_lock; /* for serializing fm radio operations */
+ atomic_t users;
+
+ wait_queue_head_t rds_read_queue;
+ struct kfifo rds_fifo;
+ struct work_struct rds_fifo_drainer;
+ bool rds_drainer_is_working;
+ struct mutex rds_drainer_status_lock;
+
+ wait_queue_head_t command;
+ atomic_t cts;
+
+ wait_queue_head_t tuning;
+ atomic_t stc;
+
+ struct si476x_power_up_args power_up_parameters;
+
+ enum si476x_power_state power_state;
+
+ struct regulator_bulk_data supplies[4];
+
+ int gpio_reset;
+
+ struct si476x_pinmux pinmux;
+ enum si476x_phase_diversity_mode diversity_mode;
+
+ atomic_t is_alive;
+
+ struct delayed_work status_monitor;
+#define SI476X_WORK_TO_CORE(w) container_of(to_delayed_work(w), \
+ struct si476x_core, \
+ status_monitor)
+
+ int revision;
+
+ int rds_fifo_depth;
+};
+
+static inline struct si476x_core *i2c_mfd_cell_to_core(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev->parent);
+ return i2c_get_clientdata(client);
+}
+
+
+/**
+ * si476x_core_lock() - lock the core device to get an exclusive access
+ * to it.
+ */
+static inline void si476x_core_lock(struct si476x_core *core)
+{
+ mutex_lock(&core->cmd_lock);
+}
+
+/**
+ * si476x_core_unlock() - unlock the core device to relinquish an
+ * exclusive access to it.
+ */
+static inline void si476x_core_unlock(struct si476x_core *core)
+{
+ mutex_unlock(&core->cmd_lock);
+}
+
+/* *_TUNE_FREQ family of commands accept frequency in multiples of
+ 10kHz */
+static inline u16 hz_to_si476x(struct si476x_core *core, int freq)
+{
+ u16 result;
+
+ switch (core->power_up_parameters.func) {
+ default:
+ case SI476X_FUNC_FM_RECEIVER:
+ result = freq / 10000;
+ break;
+ case SI476X_FUNC_AM_RECEIVER:
+ result = freq / 1000;
+ break;
+ }
+
+ return result;
+}
+
+static inline int si476x_to_hz(struct si476x_core *core, u16 freq)
+{
+ int result;
+
+ switch (core->power_up_parameters.func) {
+ default:
+ case SI476X_FUNC_FM_RECEIVER:
+ result = freq * 10000;
+ break;
+ case SI476X_FUNC_AM_RECEIVER:
+ result = freq * 1000;
+ break;
+ }
+
+ return result;
+}
+
+/* Since the V4L2_TUNER_CAP_LOW flag is supplied, V4L2 subsystem
+ * mesures frequency in 62.5 Hz units */
+
+static inline int hz_to_v4l2(int freq)
+{
+ return (freq * 10) / 625;
+}
+
+static inline int v4l2_to_hz(int freq)
+{
+ return (freq * 625) / 10;
+}
+
+static inline u16 v4l2_to_si476x(struct si476x_core *core, int freq)
+{
+ return hz_to_si476x(core, v4l2_to_hz(freq));
+}
+
+static inline int si476x_to_v4l2(struct si476x_core *core, u16 freq)
+{
+ return hz_to_v4l2(si476x_to_hz(core, freq));
+}
+
+
+
+/**
+ * struct si476x_func_info - structure containing result of the
+ * FUNC_INFO command.
+ *
+ * @firmware.major: Firmware major number.
+ * @firmware.minor[...]: Firmware minor numbers.
+ * @patch_id:
+ * @func: Mode tuner is working in.
+ */
+struct si476x_func_info {
+ struct {
+ u8 major, minor[2];
+ } firmware;
+ u16 patch_id;
+ enum si476x_func func;
+};
+
+/**
+ * struct si476x_power_down_args - structure used to pass parameters
+ * to POWER_DOWN command
+ *
+ * @xosc: true - Power down, but leav oscillator running.
+ * false - Full power down.
+ */
+struct si476x_power_down_args {
+ bool xosc;
+};
+
+/**
+ * enum si476x_tunemode - enum representing possible tune modes for
+ * the chip.
+ * @SI476X_TM_VALIDATED_NORMAL_TUNE: Unconditionally stay on the new
+ * channel after tune, tune status is valid.
+ * @SI476X_TM_INVALIDATED_FAST_TUNE: Unconditionally stay in the new
+ * channel after tune, tune status invalid.
+ * @SI476X_TM_VALIDATED_AF_TUNE: Jump back to previous channel if
+ * metric thresholds are not met.
+ * @SI476X_TM_VALIDATED_AF_CHECK: Unconditionally jump back to the
+ * previous channel.
+ */
+enum si476x_tunemode {
+ SI476X_TM_VALIDATED_NORMAL_TUNE = 0,
+ SI476X_TM_INVALIDATED_FAST_TUNE = 1,
+ SI476X_TM_VALIDATED_AF_TUNE = 2,
+ SI476X_TM_VALIDATED_AF_CHECK = 3,
+};
+
+/**
+ * enum si476x_smoothmetrics - enum containing the possible setting fo
+ * audio transitioning of the chip
+ * @SI476X_SM_INITIALIZE_AUDIO: Initialize audio state to match this
+ * new channel
+ * @SI476X_SM_TRANSITION_AUDIO: Transition audio state from previous
+ * channel values to the new values
+ */
+enum si476x_smoothmetrics {
+ SI476X_SM_INITIALIZE_AUDIO = 0,
+ SI476X_SM_TRANSITION_AUDIO = 1,
+};
+
+/**
+ * struct si476x_rds_status_report - the structure representing the
+ * response to 'FM_RD_STATUS' command
+ * @rdstpptyint: Traffic program flag(TP) and/or program type(PTY)
+ * code has changed.
+ * @rdspiint: Program indentifiaction(PI) code has changed.
+ * @rdssyncint: RDS synchronization has changed.
+ * @rdsfifoint: RDS was received and the RDS FIFO has at least
+ * 'FM_RDS_INTERRUPT_FIFO_COUNT' elements in it.
+ * @tpptyvalid: TP flag and PTY code are valid falg.
+ * @pivalid: PI code is valid flag.
+ * @rdssync: RDS is currently synchronized.
+ * @rdsfifolost: On or more RDS groups have been lost/discarded flag.
+ * @tp: Current channel's TP flag.
+ * @pty: Current channel's PTY code.
+ * @pi: Current channel's PI code.
+ * @rdsfifoused: Number of blocks remaining in the RDS FIFO (0 if
+ * empty).
+ */
+struct si476x_rds_status_report {
+ bool rdstpptyint, rdspiint, rdssyncint, rdsfifoint;
+ bool tpptyvalid, pivalid, rdssync, rdsfifolost;
+ bool tp;
+
+ u8 pty;
+ u16 pi;
+
+ u8 rdsfifoused;
+ u8 ble[4];
+
+ struct v4l2_rds_data rds[4];
+};
+
+struct si476x_rsq_status_args {
+ bool primary;
+ bool rsqack;
+ bool attune;
+ bool cancel;
+ bool stcack;
+};
+
+enum si476x_injside {
+ SI476X_INJSIDE_AUTO = 0,
+ SI476X_INJSIDE_LOW = 1,
+ SI476X_INJSIDE_HIGH = 2,
+};
+
+struct si476x_tune_freq_args {
+ bool zifsr;
+ bool hd;
+ enum si476x_injside injside;
+ int freq;
+ enum si476x_tunemode tunemode;
+ enum si476x_smoothmetrics smoothmetrics;
+ int antcap;
+};
+
+int si476x_core_stop(struct si476x_core *, bool);
+int si476x_core_start(struct si476x_core *, bool);
+int si476x_core_set_power_state(struct si476x_core *, enum si476x_power_state);
+bool si476x_core_has_am(struct si476x_core *);
+bool si476x_core_has_diversity(struct si476x_core *);
+bool si476x_core_is_a_secondary_tuner(struct si476x_core *);
+bool si476x_core_is_a_primary_tuner(struct si476x_core *);
+bool si476x_core_is_in_am_receiver_mode(struct si476x_core *core);
+bool si476x_core_is_powered_up(struct si476x_core *core);
+
+enum si476x_i2c_type {
+ SI476X_I2C_SEND,
+ SI476X_I2C_RECV
+};
+
+int si476x_core_i2c_xfer(struct si476x_core *,
+ enum si476x_i2c_type,
+ char *, int);
+
+
+/* -------------------- si476x-cmd.c ----------------------- */
+
+int si476x_core_cmd_func_info(struct si476x_core *, struct si476x_func_info *);
+int si476x_core_cmd_set_property(struct si476x_core *, u16, u16);
+int si476x_core_cmd_get_property(struct si476x_core *, u16);
+int si476x_core_cmd_dig_audio_pin_cfg(struct si476x_core *,
+ enum si476x_dclk_config,
+ enum si476x_dfs_config,
+ enum si476x_dout_config,
+ enum si476x_xout_config);
+int si476x_core_cmd_zif_pin_cfg(struct si476x_core *,
+ enum si476x_iqclk_config,
+ enum si476x_iqfs_config,
+ enum si476x_iout_config,
+ enum si476x_qout_config);
+int si476x_core_cmd_ic_link_gpo_ctl_pin_cfg(struct si476x_core *,
+ enum si476x_icin_config,
+ enum si476x_icip_config,
+ enum si476x_icon_config,
+ enum si476x_icop_config);
+int si476x_core_cmd_ana_audio_pin_cfg(struct si476x_core *,
+ enum si476x_lrout_config);
+int si476x_core_cmd_intb_pin_cfg(struct si476x_core *, enum si476x_intb_config,
+ enum si476x_a1_config);
+int si476x_core_cmd_fm_seek_start(struct si476x_core *, bool, bool);
+int si476x_core_cmd_am_seek_start(struct si476x_core *, bool, bool);
+int si476x_core_cmd_fm_rds_status(struct si476x_core *, bool, bool, bool,
+ struct si476x_rds_status_report *);
+int si476x_core_cmd_fm_rds_blockcount(struct si476x_core *, bool,
+ struct si476x_rds_blockcount_report *);
+int si476x_core_cmd_fm_tune_freq(struct si476x_core *,
+ struct si476x_tune_freq_args *);
+int si476x_core_cmd_am_tune_freq(struct si476x_core *,
+ struct si476x_tune_freq_args *);
+int si476x_core_cmd_am_rsq_status(struct si476x_core *,
+ struct si476x_rsq_status_args *,
+ struct si476x_rsq_status_report *);
+int si476x_core_cmd_fm_rsq_status(struct si476x_core *,
+ struct si476x_rsq_status_args *,
+ struct si476x_rsq_status_report *);
+int si476x_core_cmd_power_up(struct si476x_core *,
+ struct si476x_power_up_args *);
+int si476x_core_cmd_power_down(struct si476x_core *,
+ struct si476x_power_down_args *);
+int si476x_core_cmd_fm_phase_div_status(struct si476x_core *);
+int si476x_core_cmd_fm_phase_diversity(struct si476x_core *,
+ enum si476x_phase_diversity_mode);
+
+int si476x_core_cmd_fm_acf_status(struct si476x_core *,
+ struct si476x_acf_status_report *);
+int si476x_core_cmd_am_acf_status(struct si476x_core *,
+ struct si476x_acf_status_report *);
+int si476x_core_cmd_agc_status(struct si476x_core *,
+ struct si476x_agc_status_report *);
+
+enum si476x_power_grid_type {
+ SI476X_POWER_GRID_50HZ = 0,
+ SI476X_POWER_GRID_60HZ,
+};
+
+/* Properties */
+
+enum si476x_interrupt_flags {
+ SI476X_STCIEN = (1 << 0),
+ SI476X_ACFIEN = (1 << 1),
+ SI476X_RDSIEN = (1 << 2),
+ SI476X_RSQIEN = (1 << 3),
+
+ SI476X_ERRIEN = (1 << 6),
+ SI476X_CTSIEN = (1 << 7),
+
+ SI476X_STCREP = (1 << 8),
+ SI476X_ACFREP = (1 << 9),
+ SI476X_RDSREP = (1 << 10),
+ SI476X_RSQREP = (1 << 11),
+};
+
+enum si476x_rdsint_sources {
+ SI476X_RDSTPPTY = (1 << 4),
+ SI476X_RDSPI = (1 << 3),
+ SI476X_RDSSYNC = (1 << 1),
+ SI476X_RDSRECV = (1 << 0),
+};
+
+enum si476x_status_response_bits {
+ SI476X_CTS = (1 << 7),
+ SI476X_ERR = (1 << 6),
+ /* Status response for WB receiver */
+ SI476X_WB_ASQ_INT = (1 << 4),
+ SI476X_RSQ_INT = (1 << 3),
+ /* Status response for FM receiver */
+ SI476X_FM_RDS_INT = (1 << 2),
+ SI476X_ACF_INT = (1 << 1),
+ SI476X_STC_INT = (1 << 0),
+};
+
+/* -------------------- si476x-prop.c ----------------------- */
+
+enum si476x_common_receiver_properties {
+ SI476X_PROP_INT_CTL_ENABLE = 0x0000,
+ SI476X_PROP_DIGITAL_IO_INPUT_SAMPLE_RATE = 0x0200,
+ SI476X_PROP_DIGITAL_IO_INPUT_FORMAT = 0x0201,
+ SI476X_PROP_DIGITAL_IO_OUTPUT_SAMPLE_RATE = 0x0202,
+ SI476X_PROP_DIGITAL_IO_OUTPUT_FORMAT = 0x0203,
+
+ SI476X_PROP_SEEK_BAND_BOTTOM = 0x1100,
+ SI476X_PROP_SEEK_BAND_TOP = 0x1101,
+ SI476X_PROP_SEEK_FREQUENCY_SPACING = 0x1102,
+
+ SI476X_PROP_VALID_MAX_TUNE_ERROR = 0x2000,
+ SI476X_PROP_VALID_SNR_THRESHOLD = 0x2003,
+ SI476X_PROP_VALID_RSSI_THRESHOLD = 0x2004,
+};
+
+enum si476x_am_receiver_properties {
+ SI476X_PROP_AUDIO_PWR_LINE_FILTER = 0x0303,
+};
+
+enum si476x_fm_receiver_properties {
+ SI476X_PROP_AUDIO_DEEMPHASIS = 0x0302,
+
+ SI476X_PROP_FM_RDS_INTERRUPT_SOURCE = 0x4000,
+ SI476X_PROP_FM_RDS_INTERRUPT_FIFO_COUNT = 0x4001,
+ SI476X_PROP_FM_RDS_CONFIG = 0x4002,
+};
+
+enum si476x_prop_audio_pwr_line_filter_bits {
+ SI476X_PROP_PWR_HARMONICS_MASK = 0b0000000000011111,
+ SI476X_PROP_PWR_GRID_MASK = 0b0000000100000000,
+ SI476X_PROP_PWR_ENABLE_MASK = 0b0000001000000000,
+ SI476X_PROP_PWR_GRID_50HZ = 0b0000000000000000,
+ SI476X_PROP_PWR_GRID_60HZ = 0b0000000100000000,
+};
+
+enum si476x_prop_fm_rds_config_bits {
+ SI476X_PROP_RDSEN_MASK = 0x1,
+ SI476X_PROP_RDSEN = 0x1,
+};
+
+
+struct regmap *devm_regmap_init_si476x(struct si476x_core *);
+
+#endif /* SI476X_CORE_H */
--
1.7.10.4


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