mfd: si476x: Add header files and Kbuild plumbing

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: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/Kconfig

@@ -487,6 +487,19 @@ config MFD_SEC_CORE
 	 additional drivers must be enabled in order to use the functionality
 	 of the device
 
+config MFD_SI476X_CORE
+	tristate "Silicon Laboratories 4761/64/68 AM/FM radio."
+	depends on I2C
+	select MFD_CORE
+	select REGMAP_I2C
+	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_SM501
 	tristate "Silicon Motion SM501"
 	 ---help---

drivers/mfd/Makefile

@@ -134,6 +134,10 @@ 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

include/linux/mfd/si476x-platform.h

+/*
+ * include/media/si476x-platform.h -- Platform data specific definitions
+ *
+ * Copyright (C) 2013 Andrey Smirnov
+ *
+ * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ */
+
+#ifndef __SI476X_PLATFORM_H__
+#define __SI476X_PLATFORM_H__
+
+/* It is possible to select one of the four adresses using pins A0
+ * and A1 on SI476x */
+#define SI476X_I2C_ADDR_1	0x60
+#define SI476X_I2C_ADDR_2	0x61
+#define SI476X_I2C_ADDR_3	0x62
+#define SI476X_I2C_ADDR_4	0x63
+
+enum si476x_iqclk_config {
+	SI476X_IQCLK_NOOP = 0,
+	SI476X_IQCLK_TRISTATE = 1,
+	SI476X_IQCLK_IQ = 21,
+};
+enum si476x_iqfs_config {
+	SI476X_IQFS_NOOP = 0,
+	SI476X_IQFS_TRISTATE = 1,
+	SI476X_IQFS_IQ = 21,
+};
+enum si476x_iout_config {
+	SI476X_IOUT_NOOP = 0,
+	SI476X_IOUT_TRISTATE = 1,
+	SI476X_IOUT_OUTPUT = 22,
+};
+enum si476x_qout_config {
+	SI476X_QOUT_NOOP = 0,
+	SI476X_QOUT_TRISTATE = 1,
+	SI476X_QOUT_OUTPUT = 22,
+};
+
+enum si476x_dclk_config {
+	SI476X_DCLK_NOOP      = 0,
+	SI476X_DCLK_TRISTATE  = 1,
+	SI476X_DCLK_DAUDIO    = 10,
+};
+
+enum si476x_dfs_config {
+	SI476X_DFS_NOOP      = 0,
+	SI476X_DFS_TRISTATE  = 1,
+	SI476X_DFS_DAUDIO    = 10,
+};
+
+enum si476x_dout_config {
+	SI476X_DOUT_NOOP       = 0,
+	SI476X_DOUT_TRISTATE   = 1,
+	SI476X_DOUT_I2S_OUTPUT = 12,
+	SI476X_DOUT_I2S_INPUT  = 13,
+};
+
+enum si476x_xout_config {
+	SI476X_XOUT_NOOP        = 0,
+	SI476X_XOUT_TRISTATE    = 1,
+	SI476X_XOUT_I2S_INPUT   = 13,
+	SI476X_XOUT_MODE_SELECT = 23,
+};
+
+enum si476x_icin_config {
+	SI476X_ICIN_NOOP	= 0,
+	SI476X_ICIN_TRISTATE	= 1,
+	SI476X_ICIN_GPO1_HIGH	= 2,
+	SI476X_ICIN_GPO1_LOW	= 3,
+	SI476X_ICIN_IC_LINK	= 30,
+};
+
+enum si476x_icip_config {
+	SI476X_ICIP_NOOP	= 0,
+	SI476X_ICIP_TRISTATE	= 1,
+	SI476X_ICIP_GPO2_HIGH	= 2,
+	SI476X_ICIP_GPO2_LOW	= 3,
+	SI476X_ICIP_IC_LINK	= 30,
+};
+
+enum si476x_icon_config {
+	SI476X_ICON_NOOP	= 0,
+	SI476X_ICON_TRISTATE	= 1,
+	SI476X_ICON_I2S		= 10,
+	SI476X_ICON_IC_LINK	= 30,
+};
+
+enum si476x_icop_config {
+	SI476X_ICOP_NOOP	= 0,
+	SI476X_ICOP_TRISTATE	= 1,
+	SI476X_ICOP_I2S		= 10,
+	SI476X_ICOP_IC_LINK	= 30,
+};
+
+
+enum si476x_lrout_config {
+	SI476X_LROUT_NOOP	= 0,
+	SI476X_LROUT_TRISTATE	= 1,
+	SI476X_LROUT_AUDIO	= 2,
+	SI476X_LROUT_MPX	= 3,
+};
+
+
+enum si476x_intb_config {
+	SI476X_INTB_NOOP     = 0,
+	SI476X_INTB_TRISTATE = 1,
+	SI476X_INTB_DAUDIO   = 10,
+	SI476X_INTB_IRQ      = 40,
+};
+
+enum si476x_a1_config {
+	SI476X_A1_NOOP     = 0,
+	SI476X_A1_TRISTATE = 1,
+	SI476X_A1_IRQ      = 40,
+};
+
+
+struct si476x_pinmux {
+	enum si476x_dclk_config  dclk;
+	enum si476x_dfs_config   dfs;
+	enum si476x_dout_config  dout;
+	enum si476x_xout_config  xout;
+
+	enum si476x_iqclk_config iqclk;
+	enum si476x_iqfs_config  iqfs;
+	enum si476x_iout_config  iout;
+	enum si476x_qout_config  qout;
+
+	enum si476x_icin_config  icin;
+	enum si476x_icip_config  icip;
+	enum si476x_icon_config  icon;
+	enum si476x_icop_config  icop;
+
+	enum si476x_lrout_config lrout;
+
+	enum si476x_intb_config  intb;
+	enum si476x_a1_config    a1;
+};
+
+enum si476x_ibias6x {
+	SI476X_IBIAS6X_OTHER			= 0,
+	SI476X_IBIAS6X_RCVR1_NON_4MHZ_CLK	= 1,
+};
+
+enum si476x_xstart {
+	SI476X_XSTART_MULTIPLE_TUNER	= 0x11,
+	SI476X_XSTART_NORMAL		= 0x77,
+};
+
+enum si476x_freq {
+	SI476X_FREQ_4_MHZ		= 0,
+	SI476X_FREQ_37P209375_MHZ	= 1,
+	SI476X_FREQ_36P4_MHZ		= 2,
+	SI476X_FREQ_37P8_MHZ		=  3,
+};
+
+enum si476x_xmode {
+	SI476X_XMODE_CRYSTAL_RCVR1	= 1,
+	SI476X_XMODE_EXT_CLOCK		= 2,
+	SI476X_XMODE_CRYSTAL_RCVR2_3	= 3,
+};
+
+enum si476x_xbiashc {
+	SI476X_XBIASHC_SINGLE_RECEIVER = 0,
+	SI476X_XBIASHC_MULTIPLE_RECEIVER = 1,
+};
+
+enum si476x_xbias {
+	SI476X_XBIAS_RCVR2_3	= 0,
+	SI476X_XBIAS_4MHZ_RCVR1 = 3,
+	SI476X_XBIAS_RCVR1	= 7,
+};
+
+enum si476x_func {
+	SI476X_FUNC_BOOTLOADER	= 0,
+	SI476X_FUNC_FM_RECEIVER = 1,
+	SI476X_FUNC_AM_RECEIVER = 2,
+	SI476X_FUNC_WB_RECEIVER = 3,
+};
+
+
+/**
+ * @xcload: Selects the amount of additional on-chip capacitance to
+ *          be connected between XTAL1 and gnd and between XTAL2 and
+ *          GND. One half of the capacitance value shown here is the
+ *          additional load capacitance presented to the xtal. The
+ *          minimum step size is 0.277 pF. Recommended value is 0x28
+ *          but it will be layout dependent. Range is 0–0x3F i.e.
+ *          (0–16.33 pF)
+ * @ctsien: enable CTSINT(interrupt request when CTS condition
+ *          arises) when set
+ * @intsel: when set A1 pin becomes the interrupt pin; otherwise,
+ *          INTB is the interrupt pin
+ * @func:   selects the boot function of the device. I.e.
+ *          SI476X_BOOTLOADER  - Boot loader
+ *          SI476X_FM_RECEIVER - FM receiver
+ *          SI476X_AM_RECEIVER - AM receiver
+ *          SI476X_WB_RECEIVER - Weatherband receiver
+ * @freq:   oscillator's crystal frequency:
+ *          SI476X_XTAL_37P209375_MHZ - 37.209375 Mhz
+ *          SI476X_XTAL_36P4_MHZ      - 36.4 Mhz
+ *          SI476X_XTAL_37P8_MHZ      - 37.8 Mhz
+ */
+struct si476x_power_up_args {
+	enum si476x_ibias6x ibias6x;
+	enum si476x_xstart  xstart;
+	u8   xcload;
+	bool fastboot;
+	enum si476x_xbiashc xbiashc;
+	enum si476x_xbias   xbias;
+	enum si476x_func    func;
+	enum si476x_freq    freq;
+	enum si476x_xmode   xmode;
+};
+
+
+/**
+ * enum si476x_phase_diversity_mode - possbile phase diversity modes
+ * for SI4764/5/6/7 chips.
+ *
+ * @SI476X_PHDIV_DISABLED:		Phase diversity feature is
+ *					disabled.
+ * @SI476X_PHDIV_PRIMARY_COMBINING:	Tuner works as a primary tuner
+ *					in combination with a
+ *					secondary one.
+ * @SI476X_PHDIV_PRIMARY_ANTENNA:	Tuner works as a primary tuner
+ *					using only its own antenna.
+ * @SI476X_PHDIV_SECONDARY_ANTENNA:	Tuner works as a primary tuner
+ *					usning seconary tuner's antenna.
+ * @SI476X_PHDIV_SECONDARY_COMBINING:	Tuner works as a secondary
+ *					tuner in combination with the
+ *					primary one.
+ */
+enum si476x_phase_diversity_mode {
+	SI476X_PHDIV_DISABLED			= 0,
+	SI476X_PHDIV_PRIMARY_COMBINING		= 1,
+	SI476X_PHDIV_PRIMARY_ANTENNA		= 2,
+	SI476X_PHDIV_SECONDARY_ANTENNA		= 3,
+	SI476X_PHDIV_SECONDARY_COMBINING	= 5,
+};
+
+
+/*
+ * Platform dependent definition
+ */
+struct si476x_platform_data {
+	int gpio_reset; /* < 0 if not used */
+
+	struct si476x_power_up_args power_up_parameters;
+	enum si476x_phase_diversity_mode diversity_mode;
+
+	struct si476x_pinmux pinmux;
+};
+
+
+#endif /* __SI476X_PLATFORM_H__ */

include/linux/mfd/si476x-reports.h

+/*
+ * include/media/si476x-platform.h -- Definitions of the data formats
+ * returned by debugfs hooks
+ *
+ * Copyright (C) 2013 Andrey Smirnov
+ *
+ * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ */
+
+#ifndef __SI476X_REPORTS_H__
+#define __SI476X_REPORTS_H__
+
+/**
+ * struct si476x_rsq_status - structure containing received signal
+ * quality
+ * @multhint:   Multipath Detect High.
+ *              true  - Indicatedes that the value is below
+ *                      FM_RSQ_MULTIPATH_HIGH_THRESHOLD
+ *              false - Indicatedes that the value is above
+ *                      FM_RSQ_MULTIPATH_HIGH_THRESHOLD
+ * @multlint:   Multipath Detect Low.
+ *              true  - Indicatedes that the value is below
+ *                      FM_RSQ_MULTIPATH_LOW_THRESHOLD
+ *              false - Indicatedes that the value is above
+ *                      FM_RSQ_MULTIPATH_LOW_THRESHOLD
+ * @snrhint:    SNR Detect High.
+ *              true  - Indicatedes that the value is below
+ *                      FM_RSQ_SNR_HIGH_THRESHOLD
+ *              false - Indicatedes that the value is above
+ *                      FM_RSQ_SNR_HIGH_THRESHOLD
+ * @snrlint:    SNR Detect Low.
+ *              true  - Indicatedes that the value is below
+ *                      FM_RSQ_SNR_LOW_THRESHOLD
+ *              false - Indicatedes that the value is above
+ *                      FM_RSQ_SNR_LOW_THRESHOLD
+ * @rssihint:   RSSI Detect High.
+ *              true  - Indicatedes that the value is below
+ *                      FM_RSQ_RSSI_HIGH_THRESHOLD
+ *              false - Indicatedes that the value is above
+ *                      FM_RSQ_RSSI_HIGH_THRESHOLD
+ * @rssilint:   RSSI Detect Low.
+ *              true  - Indicatedes that the value is below
+ *                      FM_RSQ_RSSI_LOW_THRESHOLD
+ *              false - Indicatedes that the value is above
+ *                      FM_RSQ_RSSI_LOW_THRESHOLD
+ * @bltf:       Band Limit.
+ *              Set if seek command hits the band limit or wrapped to
+ *              the original frequency.
+ * @snr_ready:  SNR measurement in progress.
+ * @rssiready:  RSSI measurement in progress.
+ * @afcrl:      Set if FREQOFF >= MAX_TUNE_ERROR
+ * @valid:      Set if the channel is valid
+ *               rssi < FM_VALID_RSSI_THRESHOLD
+ *               snr  < FM_VALID_SNR_THRESHOLD
+ *               tune_error < FM_VALID_MAX_TUNE_ERROR
+ * @readfreq:   Current tuned frequency.
+ * @freqoff:    Signed frequency offset.
+ * @rssi:       Received Signal Strength Indicator(dBuV).
+ * @snr:        RF SNR Indicator(dB).
+ * @lassi:
+ * @hassi:      Low/High side Adjacent(100 kHz) Channel Strength Indicator
+ * @mult:       Multipath indicator
+ * @dev:        Who knows? But values may vary.
+ * @readantcap: Antenna tuning capacity value.
+ * @assi:       Adjacent Channel(+/- 200kHz) Strength Indicator
+ * @usn:        Ultrasonic Noise Inticator in -DBFS
+ */
+struct si476x_rsq_status_report {
+	__u8 multhint, multlint;
+	__u8 snrhint,  snrlint;
+	__u8 rssihint, rssilint;
+	__u8 bltf;
+	__u8 snr_ready;
+	__u8 rssiready;
+	__u8 injside;
+	__u8 afcrl;
+	__u8 valid;
+
+	__u16 readfreq;
+	__s8  freqoff;
+	__s8  rssi;
+	__s8  snr;
+	__s8  issi;
+	__s8  lassi, hassi;
+	__s8  mult;
+	__u8  dev;
+	__u16 readantcap;
+	__s8  assi;
+	__s8  usn;
+
+	__u8 pilotdev;
+	__u8 rdsdev;
+	__u8 assidev;
+	__u8 strongdev;
+	__u16 rdspi;
+} __packed;
+
+/**
+ * si476x_acf_status_report - ACF report results
+ *
+ * @blend_int: If set, indicates that stereo separation has crossed
+ * below the blend threshold as set by FM_ACF_BLEND_THRESHOLD
+ * @hblend_int: If set, indicates that HiBlend cutoff frequency is
+ * lower than threshold as set by FM_ACF_HBLEND_THRESHOLD
+ * @hicut_int:  If set, indicates that HiCut cutoff frequency is lower
+ * than the threshold set by ACF_
+
+ */
+struct si476x_acf_status_report {
+	__u8 blend_int;
+	__u8 hblend_int;
+	__u8 hicut_int;
+	__u8 chbw_int;
+	__u8 softmute_int;
+	__u8 smute;
+	__u8 smattn;
+	__u8 chbw;
+	__u8 hicut;
+	__u8 hiblend;
+	__u8 pilot;
+	__u8 stblend;
+} __packed;
+
+enum si476x_fmagc {
+	SI476X_FMAGC_10K_OHM	= 0,
+	SI476X_FMAGC_800_OHM	= 1,
+	SI476X_FMAGC_400_OHM	= 2,
+	SI476X_FMAGC_200_OHM	= 4,
+	SI476X_FMAGC_100_OHM	= 8,
+	SI476X_FMAGC_50_OHM	= 16,
+	SI476X_FMAGC_25_OHM	= 32,
+	SI476X_FMAGC_12P5_OHM	= 64,
+	SI476X_FMAGC_6P25_OHM	= 128,
+};
+
+struct si476x_agc_status_report {
+	__u8 mxhi;
+	__u8 mxlo;
+	__u8 lnahi;
+	__u8 lnalo;
+	__u8 fmagc1;
+	__u8 fmagc2;
+	__u8 pgagain;
+	__u8 fmwblang;
+} __packed;
+
+struct si476x_rds_blockcount_report {
+	__u16 expected;
+	__u16 received;
+	__u16 uncorrectable;
+} __packed;
+
+#endif  /* __SI476X_REPORTS_H__ */