[media] mfd: Add header files and Kbuild plumbing for SI476x MFD core
authorAndrey Smirnov <andrew.smirnov@gmail.com>
Wed, 27 Mar 2013 01:47:21 +0000 (22:47 -0300)
committerMauro Carvalho Chehab <mchehab@redhat.com>
Fri, 29 Mar 2013 12:15:26 +0000 (09:15 -0300)
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.

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
drivers/mfd/Kconfig
drivers/mfd/Makefile
include/linux/mfd/si476x-core.h [new file with mode: 0644]

index 671f5b171c737d78c9659d2afe3a68e02fd3981f..9b80e1edeeb62e5bad39972f1325de6691bfa340 100644 (file)
@@ -976,6 +976,18 @@ 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
+       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
index b90409c236645ea3769e963a142b263e7c3eb35f..b7aaa1e104a105fae69b2e1ae882587b1373d6f8 100644 (file)
@@ -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-y := 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 (file)
index 0000000..2136b26
--- /dev/null
@@ -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 */