/*
 * Maxim Integrated MAX2175 RF to Bits tuner driver
 *
 * This driver & most of the hard coded values are based on the reference
 * application delivered by Maxim for this device.
 *
 * Copyright (C) 2016 Maxim Integrated Products
 * Copyright (C) 2017 Renesas Electronics Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * 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/clk.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/math64.h>
#include <linux/max2175.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>

#include "max2175.h"

#define DRIVER_NAME "max2175"

#define mxm_dbg(ctx, fmt, arg...) dev_dbg(&ctx->client->dev, fmt, ## arg)
#define mxm_err(ctx, fmt, arg...) dev_err(&ctx->client->dev, fmt, ## arg)

/* Rx mode */
struct max2175_rxmode {
	enum max2175_band band;		/* Associated band */
	u32 freq;			/* Default freq in Hz */
	u8 i2s_word_size;		/* Bit value */
};

/* Register map to define preset values */
struct max2175_reg_map {
	u8 idx;				/* Register index */
	u8 val;				/* Register value */
};

static const struct max2175_rxmode eu_rx_modes[] = {
	/* EU modes */
	[MAX2175_EU_FM_1_2] = { MAX2175_BAND_FM, 98256000, 1 },
	[MAX2175_DAB_1_2]   = { MAX2175_BAND_VHF, 182640000, 0 },
};

static const struct max2175_rxmode na_rx_modes[] = {
	/* NA modes */
	[MAX2175_NA_FM_1_0] = { MAX2175_BAND_FM, 98255520, 1 },
	[MAX2175_NA_FM_2_0] = { MAX2175_BAND_FM, 98255520, 6 },
};

/*
 * Preset values:
 * Based on Maxim MAX2175 Register Table revision: 130p10
 */
static const u8 full_fm_eu_1p0[] = {
	0x15, 0x04, 0xb8, 0xe3, 0x35, 0x18, 0x7c, 0x00,
	0x00, 0x7d, 0x40, 0x08, 0x70, 0x7a, 0x88, 0x91,
	0x61, 0x61, 0x61, 0x61, 0x5a, 0x0f, 0x34, 0x1c,
	0x14, 0x88, 0x33, 0x02, 0x00, 0x09, 0x00, 0x65,
	0x9f, 0x2b, 0x80, 0x00, 0x95, 0x05, 0x2c, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40,
	0x4a, 0x08, 0xa8, 0x0e, 0x0e, 0x2f, 0x7e, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0xab, 0x5e, 0xa9,
	0xae, 0xbb, 0x57, 0x18, 0x3b, 0x03, 0x3b, 0x64,
	0x40, 0x60, 0x00, 0x2a, 0xbf, 0x3f, 0xff, 0x9f,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x00,
	0xff, 0xfc, 0xef, 0x1c, 0x40, 0x00, 0x00, 0x02,
	0x00, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0xac, 0x40, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x75, 0x00, 0x00,
	0x00, 0x47, 0x00, 0x00, 0x11, 0x3f, 0x22, 0x00,
	0xf1, 0x00, 0x41, 0x03, 0xb0, 0x00, 0x00, 0x00,
	0x1b,
};

static const u8 full_fm_na_1p0[] = {
	0x13, 0x08, 0x8d, 0xc0, 0x35, 0x18, 0x7d, 0x3f,
	0x7d, 0x75, 0x40, 0x08, 0x70, 0x7a, 0x88, 0x91,
	0x61, 0x61, 0x61, 0x61, 0x5c, 0x0f, 0x34, 0x1c,
	0x14, 0x88, 0x33, 0x02, 0x00, 0x01, 0x00, 0x65,
	0x9f, 0x2b, 0x80, 0x00, 0x95, 0x05, 0x2c, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40,
	0x4a, 0x08, 0xa8, 0x0e, 0x0e, 0xaf, 0x7e, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0xab, 0x5e, 0xa9,
	0xae, 0xbb, 0x57, 0x18, 0x3b, 0x03, 0x3b, 0x64,
	0x40, 0x60, 0x00, 0x2a, 0xbf, 0x3f, 0xff, 0x9f,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x00,
	0xff, 0xfc, 0xef, 0x1c, 0x40, 0x00, 0x00, 0x02,
	0x00, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0xa6, 0x40, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x75, 0x00, 0x00,
	0x00, 0x35, 0x00, 0x00, 0x11, 0x3f, 0x22, 0x00,
	0xf1, 0x00, 0x41, 0x03, 0xb0, 0x00, 0x00, 0x00,
	0x1b,
};

/* DAB1.2 settings */
static const struct max2175_reg_map dab12_map[] = {
	{ 0x01, 0x13 }, { 0x02, 0x0d }, { 0x03, 0x15 }, { 0x04, 0x55 },
	{ 0x05, 0x0a }, { 0x06, 0xa0 }, { 0x07, 0x40 }, { 0x08, 0x00 },
	{ 0x09, 0x00 }, { 0x0a, 0x7d }, { 0x0b, 0x4a }, { 0x0c, 0x28 },
	{ 0x0e, 0x43 }, { 0x0f, 0xb5 }, { 0x10, 0x31 }, { 0x11, 0x9e },
	{ 0x12, 0x68 }, { 0x13, 0x9e }, { 0x14, 0x68 }, { 0x15, 0x58 },
	{ 0x16, 0x2f }, { 0x17, 0x3f }, { 0x18, 0x40 }, { 0x1a, 0x88 },
	{ 0x1b, 0xaa }, { 0x1c, 0x9a }, { 0x1d, 0x00 }, { 0x1e, 0x00 },
	{ 0x23, 0x80 }, { 0x24, 0x00 }, { 0x25, 0x00 }, { 0x26, 0x00 },
	{ 0x27, 0x00 }, { 0x32, 0x08 }, { 0x33, 0xf8 }, { 0x36, 0x2d },
	{ 0x37, 0x7e }, { 0x55, 0xaf }, { 0x56, 0x3f }, { 0x57, 0xf8 },
	{ 0x58, 0x99 }, { 0x76, 0x00 }, { 0x77, 0x00 }, { 0x78, 0x02 },
	{ 0x79, 0x40 }, { 0x82, 0x00 }, { 0x83, 0x00 }, { 0x85, 0x00 },
	{ 0x86, 0x20 },
};

/* EU FM 1.2 settings */
static const struct max2175_reg_map fmeu1p2_map[] = {
	{ 0x01, 0x15 }, { 0x02, 0x04 }, { 0x03, 0xb8 }, { 0x04, 0xe3 },
	{ 0x05, 0x35 }, { 0x06, 0x18 }, { 0x07, 0x7c }, { 0x08, 0x00 },
	{ 0x09, 0x00 }, { 0x0a, 0x73 }, { 0x0b, 0x40 }, { 0x0c, 0x08 },
	{ 0x0e, 0x7a }, { 0x0f, 0x88 }, { 0x10, 0x91 }, { 0x11, 0x61 },
	{ 0x12, 0x61 }, { 0x13, 0x61 }, { 0x14, 0x61 }, { 0x15, 0x5a },
	{ 0x16, 0x0f }, { 0x17, 0x34 }, { 0x18, 0x1c }, { 0x1a, 0x88 },
	{ 0x1b, 0x33 }, { 0x1c, 0x02 }, { 0x1d, 0x00 }, { 0x1e, 0x01 },
	{ 0x23, 0x80 }, { 0x24, 0x00 }, { 0x25, 0x95 }, { 0x26, 0x05 },
	{ 0x27, 0x2c }, { 0x32, 0x08 }, { 0x33, 0xa8 }, { 0x36, 0x2f },
	{ 0x37, 0x7e }, { 0x55, 0xbf }, { 0x56, 0x3f }, { 0x57, 0xff },
	{ 0x58, 0x9f }, { 0x76, 0xac }, { 0x77, 0x40 }, { 0x78, 0x00 },
	{ 0x79, 0x00 }, { 0x82, 0x47 }, { 0x83, 0x00 }, { 0x85, 0x11 },
	{ 0x86, 0x3f },
};

/* FM NA 1.0 settings */
static const struct max2175_reg_map fmna1p0_map[] = {
	{ 0x01, 0x13 }, { 0x02, 0x08 }, { 0x03, 0x8d }, { 0x04, 0xc0 },
	{ 0x05, 0x35 }, { 0x06, 0x18 }, { 0x07, 0x7d }, { 0x08, 0x3f },
	{ 0x09, 0x7d }, { 0x0a, 0x75 }, { 0x0b, 0x40 }, { 0x0c, 0x08 },
	{ 0x0e, 0x7a }, { 0x0f, 0x88 }, { 0x10, 0x91 }, { 0x11, 0x61 },
	{ 0x12, 0x61 }, { 0x13, 0x61 }, { 0x14, 0x61 }, { 0x15, 0x5c },
	{ 0x16, 0x0f }, { 0x17, 0x34 }, { 0x18, 0x1c }, { 0x1a, 0x88 },
	{ 0x1b, 0x33 }, { 0x1c, 0x02 }, { 0x1d, 0x00 }, { 0x1e, 0x01 },
	{ 0x23, 0x80 }, { 0x24, 0x00 }, { 0x25, 0x95 }, { 0x26, 0x05 },
	{ 0x27, 0x2c }, { 0x32, 0x08 }, { 0x33, 0xa8 }, { 0x36, 0xaf },
	{ 0x37, 0x7e }, { 0x55, 0xbf }, { 0x56, 0x3f }, { 0x57, 0xff },
	{ 0x58, 0x9f }, { 0x76, 0xa6 }, { 0x77, 0x40 }, { 0x78, 0x00 },
	{ 0x79, 0x00 }, { 0x82, 0x35 }, { 0x83, 0x00 }, { 0x85, 0x11 },
	{ 0x86, 0x3f },
};

/* FM NA 2.0 settings */
static const struct max2175_reg_map fmna2p0_map[] = {
	{ 0x01, 0x13 }, { 0x02, 0x08 }, { 0x03, 0x8d }, { 0x04, 0xc0 },
	{ 0x05, 0x35 }, { 0x06, 0x18 }, { 0x07, 0x7c }, { 0x08, 0x54 },
	{ 0x09, 0xa7 }, { 0x0a, 0x55 }, { 0x0b, 0x42 }, { 0x0c, 0x48 },
	{ 0x0e, 0x7a }, { 0x0f, 0x88 }, { 0x10, 0x91 }, { 0x11, 0x61 },
	{ 0x12, 0x61 }, { 0x13, 0x61 }, { 0x14, 0x61 }, { 0x15, 0x5c },
	{ 0x16, 0x0f }, { 0x17, 0x34 }, { 0x18, 0x1c }, { 0x1a, 0x88 },
	{ 0x1b, 0x33 }, { 0x1c, 0x02 }, { 0x1d, 0x00 }, { 0x1e, 0x01 },
	{ 0x23, 0x80 }, { 0x24, 0x00 }, { 0x25, 0x95 }, { 0x26, 0x05 },
	{ 0x27, 0x2c }, { 0x32, 0x08 }, { 0x33, 0xa8 }, { 0x36, 0xaf },
	{ 0x37, 0x7e }, { 0x55, 0xbf }, { 0x56, 0x3f }, { 0x57, 0xff },
	{ 0x58, 0x9f }, { 0x76, 0xac }, { 0x77, 0xc0 }, { 0x78, 0x00 },
	{ 0x79, 0x00 }, { 0x82, 0x6b }, { 0x83, 0x00 }, { 0x85, 0x11 },
	{ 0x86, 0x3f },
};

static const u16 ch_coeff_dab1[] = {
	0x001c, 0x0007, 0xffcd, 0x0056, 0xffa4, 0x0033, 0x0027, 0xff61,
	0x010e, 0xfec0, 0x0106, 0xffb8, 0xff1c, 0x023c, 0xfcb2, 0x039b,
	0xfd4e, 0x0055, 0x036a, 0xf7de, 0x0d21, 0xee72, 0x1499, 0x6a51,
};

static const u16 ch_coeff_fmeu[] = {
	0x0000, 0xffff, 0x0001, 0x0002, 0xfffa, 0xffff, 0x0015, 0xffec,
	0xffde, 0x0054, 0xfff9, 0xff52, 0x00b8, 0x00a2, 0xfe0a, 0x00af,
	0x02e3, 0xfc14, 0xfe89, 0x089d, 0xfa2e, 0xf30f, 0x25be, 0x4eb6,
};

static const u16 eq_coeff_fmeu1_ra02_m6db[] = {
	0x0040, 0xffc6, 0xfffa, 0x002c, 0x000d, 0xff90, 0x0037, 0x006e,
	0xffc0, 0xff5b, 0x006a, 0x00f0, 0xff57, 0xfe94, 0x0112, 0x0252,
	0xfe0c, 0xfc6a, 0x0385, 0x0553, 0xfa49, 0xf789, 0x0b91, 0x1a10,
};

static const u16 ch_coeff_fmna[] = {
	0x0001, 0x0003, 0xfffe, 0xfff4, 0x0000, 0x001f, 0x000c, 0xffbc,
	0xffd3, 0x007d, 0x0075, 0xff33, 0xff01, 0x0131, 0x01ef, 0xfe60,
	0xfc7a, 0x020e, 0x0656, 0xfd94, 0xf395, 0x02ab, 0x2857, 0x3d3f,
};

static const u16 eq_coeff_fmna1_ra02_m6db[] = {
	0xfff1, 0xffe1, 0xffef, 0x000e, 0x0030, 0x002f, 0xfff6, 0xffa7,
	0xff9d, 0x000a, 0x00a2, 0x00b5, 0xffea, 0xfed9, 0xfec5, 0x003d,
	0x0217, 0x021b, 0xff5a, 0xfc2b, 0xfcbd, 0x02c4, 0x0ac3, 0x0e85,
};

static const u8 adc_presets[2][23] = {
	{
		0x83, 0x00, 0xcf, 0xb4, 0x0f, 0x2c, 0x0c, 0x49,
		0x00, 0x00, 0x00, 0x8c,	0x02, 0x02, 0x00, 0x04,
		0xec, 0x82, 0x4b, 0xcc, 0x01, 0x88, 0x0c,
	},
	{
		0x83, 0x00, 0xcf, 0xb4,	0x0f, 0x2c, 0x0c, 0x49,
		0x00, 0x00, 0x00, 0x8c,	0x02, 0x20, 0x33, 0x8c,
		0x57, 0xd7, 0x59, 0xb7,	0x65, 0x0e, 0x0c,
	},
};

/* Tuner bands */
static const struct v4l2_frequency_band eu_bands_rf = {
	.tuner = 0,
	.type = V4L2_TUNER_RF,
	.index = 0,
	.capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
	.rangelow   = 65000000,
	.rangehigh  = 240000000,
};

static const struct v4l2_frequency_band na_bands_rf = {
	.tuner = 0,
	.type = V4L2_TUNER_RF,
	.index = 0,
	.capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
	.rangelow   = 65000000,
	.rangehigh  = 108000000,
};

/* Regmap settings */
static const struct regmap_range max2175_regmap_volatile_range[] = {
	regmap_reg_range(0x30, 0x35),
	regmap_reg_range(0x3a, 0x45),
	regmap_reg_range(0x59, 0x5e),
	regmap_reg_range(0x73, 0x75),
};

static const struct regmap_access_table max2175_volatile_regs = {
	.yes_ranges = max2175_regmap_volatile_range,
	.n_yes_ranges = ARRAY_SIZE(max2175_regmap_volatile_range),
};

static const struct reg_default max2175_reg_defaults[] = {
	{ 0x00, 0x07},
};

static const struct regmap_config max2175_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 0xff,
	.reg_defaults = max2175_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(max2175_reg_defaults),
	.volatile_table = &max2175_volatile_regs,
	.cache_type = REGCACHE_FLAT,
};

struct max2175 {
	struct v4l2_subdev sd;		/* Sub-device */
	struct i2c_client *client;	/* I2C client */

	/* Controls */
	struct v4l2_ctrl_handler ctrl_hdl;
	struct v4l2_ctrl *lna_gain;	/* LNA gain value */
	struct v4l2_ctrl *if_gain;	/* I/F gain value */
	struct v4l2_ctrl *pll_lock;	/* PLL lock */
	struct v4l2_ctrl *i2s_en;	/* I2S output enable */
	struct v4l2_ctrl *hsls;		/* High-side/Low-side polarity */
	struct v4l2_ctrl *rx_mode;	/* Receive mode */

	/* Regmap */
	struct regmap *regmap;

	/* Cached configuration */
	u32 freq;			/* Tuned freq In Hz */
	const struct max2175_rxmode *rx_modes;		/* EU or NA modes */
	const struct v4l2_frequency_band *bands_rf;	/* EU or NA bands */

	/* Device settings */
	unsigned long xtal_freq;	/* Ref Oscillator freq in Hz */
	u32 decim_ratio;
	bool master;			/* Master/Slave */
	bool am_hiz;			/* AM Hi-Z filter */

	/* ROM values */
	u8 rom_bbf_bw_am;
	u8 rom_bbf_bw_fm;
	u8 rom_bbf_bw_dab;

	/* Driver private variables */
	bool mode_resolved;		/* Flag to sanity check settings */
};

static inline struct max2175 *max2175_from_sd(struct v4l2_subdev *sd)
{
	return container_of(sd, struct max2175, sd);
}

static inline struct max2175 *max2175_from_ctrl_hdl(struct v4l2_ctrl_handler *h)
{
	return container_of(h, struct max2175, ctrl_hdl);
}

/* Get bitval of a given val */
static inline u8 max2175_get_bitval(u8 val, u8 msb, u8 lsb)
{
	return (val & GENMASK(msb, lsb)) >> lsb;
}

/* Read/Write bit(s) on top of regmap */
static int max2175_read(struct max2175 *ctx, u8 idx, u8 *val)
{
	u32 regval;
	int ret;

	ret = regmap_read(ctx->regmap, idx, &regval);
	if (ret)
		mxm_err(ctx, "read ret(%d): idx 0x%02x\n", ret, idx);
	else
		*val = regval;

	return ret;
}

static int max2175_write(struct max2175 *ctx, u8 idx, u8 val)
{
	int ret;

	ret = regmap_write(ctx->regmap, idx, val);
	if (ret)
		mxm_err(ctx, "write ret(%d): idx 0x%02x val 0x%02x\n",
			ret, idx, val);

	return ret;
}

static u8 max2175_read_bits(struct max2175 *ctx, u8 idx, u8 msb, u8 lsb)
{
	u8 val;

	if (max2175_read(ctx, idx, &val))
		return 0;

	return max2175_get_bitval(val, msb, lsb);
}

static int max2175_write_bits(struct max2175 *ctx, u8 idx,
			     u8 msb, u8 lsb, u8 newval)
{
	int ret = regmap_update_bits(ctx->regmap, idx, GENMASK(msb, lsb),
				     newval << lsb);

	if (ret)
		mxm_err(ctx, "wbits ret(%d): idx 0x%02x\n", ret, idx);

	return ret;
}

static int max2175_write_bit(struct max2175 *ctx, u8 idx, u8 bit, u8 newval)
{
	return max2175_write_bits(ctx, idx, bit, bit, newval);
}

/* Checks expected pattern every msec until timeout */
static int max2175_poll_timeout(struct max2175 *ctx, u8 idx, u8 msb, u8 lsb,
				u8 exp_bitval, u32 timeout_us)
{
	unsigned int val;

	return regmap_read_poll_timeout(ctx->regmap, idx, val,
			(max2175_get_bitval(val, msb, lsb) == exp_bitval),
			1000, timeout_us);
}

static int max2175_poll_csm_ready(struct max2175 *ctx)
{
	int ret;

	ret = max2175_poll_timeout(ctx, 69, 1, 1, 0, 50000);
	if (ret)
		mxm_err(ctx, "csm not ready\n");

	return ret;
}

#define MAX2175_IS_BAND_AM(ctx)		\
	(max2175_read_bits(ctx, 5, 1, 0) == MAX2175_BAND_AM)

#define MAX2175_IS_BAND_VHF(ctx)	\
	(max2175_read_bits(ctx, 5, 1, 0) == MAX2175_BAND_VHF)

#define MAX2175_IS_FM_MODE(ctx)		\
	(max2175_read_bits(ctx, 12, 5, 4) == 0)

#define MAX2175_IS_FMHD_MODE(ctx)	\
	(max2175_read_bits(ctx, 12, 5, 4) == 1)

#define MAX2175_IS_DAB_MODE(ctx)	\
	(max2175_read_bits(ctx, 12, 5, 4) == 2)

static int max2175_band_from_freq(u32 freq)
{
	if (freq >= 144000 && freq <= 26100000)
		return MAX2175_BAND_AM;
	else if (freq >= 65000000 && freq <= 108000000)
		return MAX2175_BAND_FM;

	return MAX2175_BAND_VHF;
}

static void max2175_i2s_enable(struct max2175 *ctx, bool enable)
{
	if (enable)
		/* Stuff bits are zeroed */
		max2175_write_bits(ctx, 104, 3, 0, 2);
	else
		/* Keep SCK alive */
		max2175_write_bits(ctx, 104, 3, 0, 9);
	mxm_dbg(ctx, "i2s %sabled\n", enable ? "en" : "dis");
}

static void max2175_set_filter_coeffs(struct max2175 *ctx, u8 m_sel,
				      u8 bank, const u16 *coeffs)
{
	unsigned int i;
	u8 coeff_addr, upper_address = 24;

	mxm_dbg(ctx, "set_filter_coeffs: m_sel %d bank %d\n", m_sel, bank);
	max2175_write_bits(ctx, 114, 5, 4, m_sel);

	if (m_sel == 2)
		upper_address = 12;

	for (i = 0; i < upper_address; i++) {
		coeff_addr = i + bank * 24;
		max2175_write(ctx, 115, coeffs[i] >> 8);
		max2175_write(ctx, 116, coeffs[i]);
		max2175_write(ctx, 117, coeff_addr | 1 << 7);
	}
	max2175_write_bit(ctx, 117, 7, 0);
}

static void max2175_load_fmeu_1p2(struct max2175 *ctx)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(fmeu1p2_map); i++)
		max2175_write(ctx, fmeu1p2_map[i].idx, fmeu1p2_map[i].val);

	ctx->decim_ratio = 36;

	/* Load the Channel Filter Coefficients into channel filter bank #2 */
	max2175_set_filter_coeffs(ctx, MAX2175_CH_MSEL, 0, ch_coeff_fmeu);
	max2175_set_filter_coeffs(ctx, MAX2175_EQ_MSEL, 0,
				  eq_coeff_fmeu1_ra02_m6db);
}

static void max2175_load_dab_1p2(struct max2175 *ctx)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(dab12_map); i++)
		max2175_write(ctx, dab12_map[i].idx, dab12_map[i].val);

	ctx->decim_ratio = 1;

	/* Load the Channel Filter Coefficients into channel filter bank #2 */
	max2175_set_filter_coeffs(ctx, MAX2175_CH_MSEL, 2, ch_coeff_dab1);
}

static void max2175_load_fmna_1p0(struct max2175 *ctx)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(fmna1p0_map); i++)
		max2175_write(ctx, fmna1p0_map[i].idx, fmna1p0_map[i].val);
}

static void max2175_load_fmna_2p0(struct max2175 *ctx)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(fmna2p0_map); i++)
		max2175_write(ctx, fmna2p0_map[i].idx, fmna2p0_map[i].val);
}

static void max2175_set_bbfilter(struct max2175 *ctx)
{
	if (MAX2175_IS_BAND_AM(ctx)) {
		max2175_write_bits(ctx, 12, 3, 0, ctx->rom_bbf_bw_am);
		mxm_dbg(ctx, "set_bbfilter AM: rom %d\n", ctx->rom_bbf_bw_am);
	} else if (MAX2175_IS_DAB_MODE(ctx)) {
		max2175_write_bits(ctx, 12, 3, 0, ctx->rom_bbf_bw_dab);
		mxm_dbg(ctx, "set_bbfilter DAB: rom %d\n", ctx->rom_bbf_bw_dab);
	} else {
		max2175_write_bits(ctx, 12, 3, 0, ctx->rom_bbf_bw_fm);
		mxm_dbg(ctx, "set_bbfilter FM: rom %d\n", ctx->rom_bbf_bw_fm);
	}
}

static int max2175_set_csm_mode(struct max2175 *ctx,
			  enum max2175_csm_mode new_mode)
{
	int ret = max2175_poll_csm_ready(ctx);

	if (ret)
		return ret;

	max2175_write_bits(ctx, 0, 2, 0, new_mode);
	mxm_dbg(ctx, "set csm new mode %d\n", new_mode);

	/* Wait for a fixed settle down time depending on new mode */
	switch (new_mode) {
	case MAX2175_PRESET_TUNE:
		usleep_range(51100, 51500);	/* 51.1ms */
		break;
	/*
	 * Other mode switches need different sleep values depending on band &
	 * mode
	 */
	default:
		break;
	}

	return max2175_poll_csm_ready(ctx);
}

static int max2175_csm_action(struct max2175 *ctx,
			      enum max2175_csm_mode action)
{
	int ret;

	mxm_dbg(ctx, "csm_action: %d\n", action);

	/* Other actions can be added in future when needed */
	ret = max2175_set_csm_mode(ctx, MAX2175_LOAD_TO_BUFFER);
	if (ret)
		return ret;

	return max2175_set_csm_mode(ctx, MAX2175_PRESET_TUNE);
}

static int max2175_set_lo_freq(struct max2175 *ctx, u32 lo_freq)
{
	u8 lo_mult, loband_bits = 0, vcodiv_bits = 0;
	u32 int_desired, frac_desired;
	enum max2175_band band;
	int ret;

	band = max2175_read_bits(ctx, 5, 1, 0);
	switch (band) {
	case MAX2175_BAND_AM:
		lo_mult = 16;
		break;
	case MAX2175_BAND_FM:
		if (lo_freq <= 74700000) {
			lo_mult = 16;
		} else if (lo_freq > 74700000 && lo_freq <= 110000000) {
			loband_bits = 1;
			lo_mult = 8;
		} else {
			loband_bits = 1;
			vcodiv_bits = 3;
			lo_mult = 8;
		}
		break;
	case MAX2175_BAND_VHF:
		if (lo_freq <= 210000000)
			vcodiv_bits = 2;
		else
			vcodiv_bits = 1;

		loband_bits = 2;
		lo_mult = 4;
		break;
	default:
		loband_bits = 3;
		vcodiv_bits = 2;
		lo_mult = 2;
		break;
	}

	if (band == MAX2175_BAND_L)
		lo_freq /= lo_mult;
	else
		lo_freq *= lo_mult;

	int_desired = lo_freq / ctx->xtal_freq;
	frac_desired = div_u64((u64)(lo_freq % ctx->xtal_freq) << 20,
			       ctx->xtal_freq);

	/* Check CSM is not busy */
	ret = max2175_poll_csm_ready(ctx);
	if (ret)
		return ret;

	mxm_dbg(ctx, "lo_mult %u int %u  frac %u\n",
		lo_mult, int_desired, frac_desired);

	/* Write the calculated values to the appropriate registers */
	max2175_write(ctx, 1, int_desired);
	max2175_write_bits(ctx, 2, 3, 0, (frac_desired >> 16) & 0xf);
	max2175_write(ctx, 3, frac_desired >> 8);
	max2175_write(ctx, 4, frac_desired);
	max2175_write_bits(ctx, 5, 3, 2, loband_bits);
	max2175_write_bits(ctx, 6, 7, 6, vcodiv_bits);

	return ret;
}

/*
 * Helper similar to DIV_ROUND_CLOSEST but an inline function that accepts s64
 * dividend and s32 divisor
 */
static inline s64 max2175_round_closest(s64 dividend, s32 divisor)
{
	if ((dividend > 0 && divisor > 0) || (dividend < 0 && divisor < 0))
		return div_s64(dividend + divisor / 2, divisor);

	return div_s64(dividend - divisor / 2, divisor);
}

static int max2175_set_nco_freq(struct max2175 *ctx, s32 nco_freq)
{
	s32 clock_rate = ctx->xtal_freq / ctx->decim_ratio;
	u32 nco_reg, abs_nco_freq = abs(nco_freq);
	s64 nco_val_desired;
	int ret;

	if (abs_nco_freq < clock_rate / 2) {
		nco_val_desired = 2 * nco_freq;
	} else {
		nco_val_desired = 2 * (clock_rate - abs_nco_freq);
		if (nco_freq < 0)
			nco_val_desired = -nco_val_desired;
	}

	nco_reg = max2175_round_closest(nco_val_desired << 20, clock_rate);

	if (nco_freq < 0)
		nco_reg += 0x200000;

	/* Check CSM is not busy */
	ret = max2175_poll_csm_ready(ctx);
	if (ret)
		return ret;

	mxm_dbg(ctx, "freq %d desired %lld reg %u\n",
		nco_freq, nco_val_desired, nco_reg);

	/* Write the calculated values to the appropriate registers */
	max2175_write_bits(ctx, 7, 4, 0, (nco_reg >> 16) & 0x1f);
	max2175_write(ctx, 8, nco_reg >> 8);
	max2175_write(ctx, 9, nco_reg);

	return ret;
}

static int max2175_set_rf_freq_non_am_bands(struct max2175 *ctx, u64 freq,
					    u32 lo_pos)
{
	s64 adj_freq, low_if_freq;
	int ret;

	mxm_dbg(ctx, "rf_freq: non AM bands\n");

	if (MAX2175_IS_FM_MODE(ctx))
		low_if_freq = 128000;
	else if (MAX2175_IS_FMHD_MODE(ctx))
		low_if_freq = 228000;
	else
		return max2175_set_lo_freq(ctx, freq);

	if (MAX2175_IS_BAND_VHF(ctx) == (lo_pos == MAX2175_LO_ABOVE_DESIRED))
		adj_freq = freq + low_if_freq;
	else
		adj_freq = freq - low_if_freq;

	ret = max2175_set_lo_freq(ctx, adj_freq);
	if (ret)
		return ret;

	return max2175_set_nco_freq(ctx, -low_if_freq);
}

static int max2175_set_rf_freq(struct max2175 *ctx, u64 freq, u32 lo_pos)
{
	int ret;

	if (MAX2175_IS_BAND_AM(ctx))
		ret = max2175_set_nco_freq(ctx, freq);
	else
		ret = max2175_set_rf_freq_non_am_bands(ctx, freq, lo_pos);

	mxm_dbg(ctx, "set_rf_freq: ret %d freq %llu\n", ret, freq);

	return ret;
}

static int max2175_tune_rf_freq(struct max2175 *ctx, u64 freq, u32 hsls)
{
	int ret;

	ret = max2175_set_rf_freq(ctx, freq, hsls);
	if (ret)
		return ret;

	ret = max2175_csm_action(ctx, MAX2175_BUFFER_PLUS_PRESET_TUNE);
	if (ret)
		return ret;

	mxm_dbg(ctx, "tune_rf_freq: old %u new %llu\n", ctx->freq, freq);
	ctx->freq = freq;

	return ret;
}

static void max2175_set_hsls(struct max2175 *ctx, u32 lo_pos)
{
	mxm_dbg(ctx, "set_hsls: lo_pos %u\n", lo_pos);

	if ((lo_pos == MAX2175_LO_BELOW_DESIRED) == MAX2175_IS_BAND_VHF(ctx))
		max2175_write_bit(ctx, 5, 4, 1);
	else
		max2175_write_bit(ctx, 5, 4, 0);
}

static void max2175_set_eu_rx_mode(struct max2175 *ctx, u32 rx_mode)
{
	switch (rx_mode) {
	case MAX2175_EU_FM_1_2:
		max2175_load_fmeu_1p2(ctx);
		break;

	case MAX2175_DAB_1_2:
		max2175_load_dab_1p2(ctx);
		break;
	}
	/* Master is the default setting */
	if (!ctx->master)
		max2175_write_bit(ctx, 30, 7, 1);
}

static void max2175_set_na_rx_mode(struct max2175 *ctx, u32 rx_mode)
{
	switch (rx_mode) {
	case MAX2175_NA_FM_1_0:
		max2175_load_fmna_1p0(ctx);
		break;
	case MAX2175_NA_FM_2_0:
		max2175_load_fmna_2p0(ctx);
		break;
	}
	/* Master is the default setting */
	if (!ctx->master)
		max2175_write_bit(ctx, 30, 7, 1);

	ctx->decim_ratio = 27;

	/* Load the Channel Filter Coefficients into channel filter bank #2 */
	max2175_set_filter_coeffs(ctx, MAX2175_CH_MSEL, 0, ch_coeff_fmna);
	max2175_set_filter_coeffs(ctx, MAX2175_EQ_MSEL, 0,
				  eq_coeff_fmna1_ra02_m6db);
}

static int max2175_set_rx_mode(struct max2175 *ctx, u32 rx_mode)
{
	mxm_dbg(ctx, "set_rx_mode: %u am_hiz %u\n", rx_mode, ctx->am_hiz);
	if (ctx->xtal_freq == MAX2175_EU_XTAL_FREQ)
		max2175_set_eu_rx_mode(ctx, rx_mode);
	else
		max2175_set_na_rx_mode(ctx, rx_mode);

	if (ctx->am_hiz) {
		mxm_dbg(ctx, "setting AM HiZ related config\n");
		max2175_write_bit(ctx, 50, 5, 1);
		max2175_write_bit(ctx, 90, 7, 1);
		max2175_write_bits(ctx, 73, 1, 0, 2);
		max2175_write_bits(ctx, 80, 5, 0, 33);
	}

	/* Load BB filter trim values saved in ROM */
	max2175_set_bbfilter(ctx);

	/* Set HSLS */
	max2175_set_hsls(ctx, ctx->hsls->cur.val);

	/* Use i2s enable settings */
	max2175_i2s_enable(ctx, ctx->i2s_en->cur.val);

	ctx->mode_resolved = true;

	return 0;
}

static int max2175_rx_mode_from_freq(struct max2175 *ctx, u32 freq, u32 *mode)
{
	unsigned int i;
	int band = max2175_band_from_freq(freq);

	/* Pick the first match always */
	for (i = 0; i <= ctx->rx_mode->maximum; i++) {
		if (ctx->rx_modes[i].band == band) {
			*mode = i;
			mxm_dbg(ctx, "rx_mode_from_freq: freq %u mode %d\n",
				freq, *mode);
			return 0;
		}
	}

	return -EINVAL;
}

static bool max2175_freq_rx_mode_valid(struct max2175 *ctx,
					 u32 mode, u32 freq)
{
	int band = max2175_band_from_freq(freq);

	return (ctx->rx_modes[mode].band == band);
}

static void max2175_load_adc_presets(struct max2175 *ctx)
{
	unsigned int i, j;

	for (i = 0; i < ARRAY_SIZE(adc_presets); i++)
		for (j = 0; j < ARRAY_SIZE(adc_presets[0]); j++)
			max2175_write(ctx, 146 + j + i * 55, adc_presets[i][j]);
}

static int max2175_init_power_manager(struct max2175 *ctx)
{
	int ret;

	/* Execute on-chip power-up/calibration */
	max2175_write_bit(ctx, 99, 2, 0);
	usleep_range(1000, 1500);
	max2175_write_bit(ctx, 99, 2, 1);

	/* Wait for the power manager to finish. */
	ret = max2175_poll_timeout(ctx, 69, 7, 7, 1, 50000);
	if (ret)
		mxm_err(ctx, "init pm failed\n");

	return ret;
}

static int max2175_recalibrate_adc(struct max2175 *ctx)
{
	int ret;

	/* ADC Re-calibration */
	max2175_write(ctx, 150, 0xff);
	max2175_write(ctx, 205, 0xff);
	max2175_write(ctx, 147, 0x20);
	max2175_write(ctx, 147, 0x00);
	max2175_write(ctx, 202, 0x20);
	max2175_write(ctx, 202, 0x00);

	ret = max2175_poll_timeout(ctx, 69, 4, 3, 3, 50000);
	if (ret)
		mxm_err(ctx, "adc recalibration failed\n");

	return ret;
}

static u8 max2175_read_rom(struct max2175 *ctx, u8 row)
{
	u8 data = 0;

	max2175_write_bit(ctx, 56, 4, 0);
	max2175_write_bits(ctx, 56, 3, 0, row);

	usleep_range(2000, 2500);
	max2175_read(ctx, 58, &data);

	max2175_write_bits(ctx, 56, 3, 0, 0);

	mxm_dbg(ctx, "read_rom: row %d data 0x%02x\n", row, data);

	return data;
}

static void max2175_load_from_rom(struct max2175 *ctx)
{
	u8 data = 0;

	data = max2175_read_rom(ctx, 0);
	ctx->rom_bbf_bw_am = data & 0x0f;
	max2175_write_bits(ctx, 81, 3, 0, data >> 4);

	data = max2175_read_rom(ctx, 1);
	ctx->rom_bbf_bw_fm = data & 0x0f;
	ctx->rom_bbf_bw_dab = data >> 4;

	data = max2175_read_rom(ctx, 2);
	max2175_write_bits(ctx, 82, 4, 0, data & 0x1f);
	max2175_write_bits(ctx, 82, 7, 5, data >> 5);

	data = max2175_read_rom(ctx, 3);
	if (ctx->am_hiz) {
		data &= 0x0f;
		data |= (max2175_read_rom(ctx, 7) & 0x40) >> 2;
		if (!data)
			data |= 2;
	} else {
		data = (data & 0xf0) >> 4;
		data |= (max2175_read_rom(ctx, 7) & 0x80) >> 3;
		if (!data)
			data |= 30;
	}
	max2175_write_bits(ctx, 80, 5, 0, data + 31);

	data = max2175_read_rom(ctx, 6);
	max2175_write_bits(ctx, 81, 7, 6, data >> 6);
}

static void max2175_load_full_fm_eu_1p0(struct max2175 *ctx)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(full_fm_eu_1p0); i++)
		max2175_write(ctx, i + 1, full_fm_eu_1p0[i]);

	usleep_range(5000, 5500);
	ctx->decim_ratio = 36;
}

static void max2175_load_full_fm_na_1p0(struct max2175 *ctx)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(full_fm_na_1p0); i++)
		max2175_write(ctx, i + 1, full_fm_na_1p0[i]);

	usleep_range(5000, 5500);
	ctx->decim_ratio = 27;
}

static int max2175_core_init(struct max2175 *ctx, u32 refout_bits)
{
	int ret;

	/* MAX2175 uses 36.864MHz clock for EU & 40.154MHz for NA region */
	if (ctx->xtal_freq == MAX2175_EU_XTAL_FREQ)
		max2175_load_full_fm_eu_1p0(ctx);
	else
		max2175_load_full_fm_na_1p0(ctx);

	/* The default settings assume master */
	if (!ctx->master)
		max2175_write_bit(ctx, 30, 7, 1);

	mxm_dbg(ctx, "refout_bits %u\n", refout_bits);

	/* Set REFOUT */
	max2175_write_bits(ctx, 56, 7, 5, refout_bits);

	/* ADC Reset */
	max2175_write_bit(ctx, 99, 1, 0);
	usleep_range(1000, 1500);
	max2175_write_bit(ctx, 99, 1, 1);

	/* Load ADC preset values */
	max2175_load_adc_presets(ctx);

	/* Initialize the power management state machine */
	ret = max2175_init_power_manager(ctx);
	if (ret)
		return ret;

	/* Recalibrate ADC */
	ret = max2175_recalibrate_adc(ctx);
	if (ret)
		return ret;

	/* Load ROM values to appropriate registers */
	max2175_load_from_rom(ctx);

	if (ctx->xtal_freq == MAX2175_EU_XTAL_FREQ) {
		/* Load FIR coefficients into bank 0 */
		max2175_set_filter_coeffs(ctx, MAX2175_CH_MSEL, 0,
					  ch_coeff_fmeu);
		max2175_set_filter_coeffs(ctx, MAX2175_EQ_MSEL, 0,
					  eq_coeff_fmeu1_ra02_m6db);
	} else {
		/* Load FIR coefficients into bank 0 */
		max2175_set_filter_coeffs(ctx, MAX2175_CH_MSEL, 0,
					  ch_coeff_fmna);
		max2175_set_filter_coeffs(ctx, MAX2175_EQ_MSEL, 0,
					  eq_coeff_fmna1_ra02_m6db);
	}
	mxm_dbg(ctx, "core initialized\n");

	return 0;
}

static void max2175_s_ctrl_rx_mode(struct max2175 *ctx, u32 rx_mode)
{
	/* Load mode. Range check already done */
	max2175_set_rx_mode(ctx, rx_mode);

	mxm_dbg(ctx, "s_ctrl_rx_mode: %u curr freq %u\n", rx_mode, ctx->freq);

	/* Check if current freq valid for mode & update */
	if (max2175_freq_rx_mode_valid(ctx, rx_mode, ctx->freq))
		max2175_tune_rf_freq(ctx, ctx->freq, ctx->hsls->cur.val);
	else
		/* Use default freq of mode if current freq is not valid */
		max2175_tune_rf_freq(ctx, ctx->rx_modes[rx_mode].freq,
				     ctx->hsls->cur.val);
}

static int max2175_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct max2175 *ctx = max2175_from_ctrl_hdl(ctrl->handler);

	mxm_dbg(ctx, "s_ctrl: id 0x%x, val %u\n", ctrl->id, ctrl->val);
	switch (ctrl->id) {
	case V4L2_CID_MAX2175_I2S_ENABLE:
		max2175_i2s_enable(ctx, ctrl->val);
		break;
	case V4L2_CID_MAX2175_HSLS:
		max2175_set_hsls(ctx, ctrl->val);
		break;
	case V4L2_CID_MAX2175_RX_MODE:
		max2175_s_ctrl_rx_mode(ctx, ctrl->val);
		break;
	}

	return 0;
}

static u32 max2175_get_lna_gain(struct max2175 *ctx)
{
	enum max2175_band band = max2175_read_bits(ctx, 5, 1, 0);

	switch (band) {
	case MAX2175_BAND_AM:
		return max2175_read_bits(ctx, 51, 3, 0);
	case MAX2175_BAND_FM:
		return max2175_read_bits(ctx, 50, 3, 0);
	case MAX2175_BAND_VHF:
		return max2175_read_bits(ctx, 52, 5, 0);
	default:
		return 0;
	}
}

static int max2175_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
{
	struct max2175 *ctx = max2175_from_ctrl_hdl(ctrl->handler);

	switch (ctrl->id) {
	case V4L2_CID_RF_TUNER_LNA_GAIN:
		ctrl->val = max2175_get_lna_gain(ctx);
		break;
	case V4L2_CID_RF_TUNER_IF_GAIN:
		ctrl->val = max2175_read_bits(ctx, 49, 4, 0);
		break;
	case V4L2_CID_RF_TUNER_PLL_LOCK:
		ctrl->val = (max2175_read_bits(ctx, 60, 7, 6) == 3);
		break;
	}

	return 0;
};

static int max2175_set_freq_and_mode(struct max2175 *ctx, u32 freq)
{
	u32 rx_mode;
	int ret;

	/* Get band from frequency */
	ret = max2175_rx_mode_from_freq(ctx, freq, &rx_mode);
	if (ret)
		return ret;

	mxm_dbg(ctx, "set_freq_and_mode: freq %u rx_mode %d\n", freq, rx_mode);

	/* Load mode */
	max2175_set_rx_mode(ctx, rx_mode);
	ctx->rx_mode->cur.val = rx_mode;

	/* Tune to the new freq given */
	return max2175_tune_rf_freq(ctx, freq, ctx->hsls->cur.val);
}

static int max2175_s_frequency(struct v4l2_subdev *sd,
			       const struct v4l2_frequency *vf)
{
	struct max2175 *ctx = max2175_from_sd(sd);
	u32 freq;
	int ret = 0;

	mxm_dbg(ctx, "s_freq: new %u curr %u, mode_resolved %d\n",
		vf->frequency, ctx->freq, ctx->mode_resolved);

	if (vf->tuner != 0)
		return -EINVAL;

	freq = clamp(vf->frequency, ctx->bands_rf->rangelow,
		     ctx->bands_rf->rangehigh);

	/* Check new freq valid for rx_mode if already resolved */
	if (ctx->mode_resolved &&
	    max2175_freq_rx_mode_valid(ctx, ctx->rx_mode->cur.val, freq))
		ret = max2175_tune_rf_freq(ctx, freq, ctx->hsls->cur.val);
	else
		/* Find default rx_mode for freq and tune to it */
		ret = max2175_set_freq_and_mode(ctx, freq);

	mxm_dbg(ctx, "s_freq: ret %d curr %u mode_resolved %d mode %u\n",
		ret, ctx->freq, ctx->mode_resolved, ctx->rx_mode->cur.val);

	return ret;
}

static int max2175_g_frequency(struct v4l2_subdev *sd,
			       struct v4l2_frequency *vf)
{
	struct max2175 *ctx = max2175_from_sd(sd);
	int ret = 0;

	if (vf->tuner != 0)
		return -EINVAL;

	/* RF freq */
	vf->type = V4L2_TUNER_RF;
	vf->frequency = ctx->freq;

	return ret;
}

static int max2175_enum_freq_bands(struct v4l2_subdev *sd,
			    struct v4l2_frequency_band *band)
{
	struct max2175 *ctx = max2175_from_sd(sd);

	if (band->tuner != 0 || band->index != 0)
		return -EINVAL;

	*band = *ctx->bands_rf;

	return 0;
}

static int max2175_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
{
	struct max2175 *ctx = max2175_from_sd(sd);

	if (vt->index > 0)
		return -EINVAL;

	strlcpy(vt->name, "RF", sizeof(vt->name));
	vt->type = V4L2_TUNER_RF;
	vt->capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS;
	vt->rangelow = ctx->bands_rf->rangelow;
	vt->rangehigh = ctx->bands_rf->rangehigh;

	return 0;
}

static int max2175_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *vt)
{
	/* Check tuner index is valid */
	if (vt->index > 0)
		return -EINVAL;

	return 0;
}

static const struct v4l2_subdev_tuner_ops max2175_tuner_ops = {
	.s_frequency = max2175_s_frequency,
	.g_frequency = max2175_g_frequency,
	.enum_freq_bands = max2175_enum_freq_bands,
	.g_tuner = max2175_g_tuner,
	.s_tuner = max2175_s_tuner,
};

static const struct v4l2_subdev_ops max2175_ops = {
	.tuner = &max2175_tuner_ops,
};

static const struct v4l2_ctrl_ops max2175_ctrl_ops = {
	.s_ctrl = max2175_s_ctrl,
	.g_volatile_ctrl = max2175_g_volatile_ctrl,
};

/*
 * I2S output enable/disable configuration. This is a private control.
 * Refer to Documentation/media/v4l-drivers/max2175 for more details.
 */
static const struct v4l2_ctrl_config max2175_i2s_en = {
	.ops = &max2175_ctrl_ops,
	.id = V4L2_CID_MAX2175_I2S_ENABLE,
	.name = "I2S Enable",
	.type = V4L2_CTRL_TYPE_BOOLEAN,
	.min = 0,
	.max = 1,
	.step = 1,
	.def = 1,
	.is_private = 1,
};

/*
 * HSLS value control LO freq adjacent location configuration.
 * Refer to Documentation/media/v4l-drivers/max2175 for more details.
 */
static const struct v4l2_ctrl_config max2175_hsls = {
	.ops = &max2175_ctrl_ops,
	.id = V4L2_CID_MAX2175_HSLS,
	.name = "HSLS Above/Below Desired",
	.type = V4L2_CTRL_TYPE_BOOLEAN,
	.min = 0,
	.max = 1,
	.step = 1,
	.def = 1,
};

/*
 * Rx modes below are a set of preset configurations that decides the tuner's
 * sck and sample rate of transmission. They are separate for EU & NA regions.
 * Refer to Documentation/media/v4l-drivers/max2175 for more details.
 */
static const char * const max2175_ctrl_eu_rx_modes[] = {
	[MAX2175_EU_FM_1_2]	= "EU FM 1.2",
	[MAX2175_DAB_1_2]	= "DAB 1.2",
};

static const char * const max2175_ctrl_na_rx_modes[] = {
	[MAX2175_NA_FM_1_0]	= "NA FM 1.0",
	[MAX2175_NA_FM_2_0]	= "NA FM 2.0",
};

static const struct v4l2_ctrl_config max2175_eu_rx_mode = {
	.ops = &max2175_ctrl_ops,
	.id = V4L2_CID_MAX2175_RX_MODE,
	.name = "RX Mode",
	.type = V4L2_CTRL_TYPE_MENU,
	.max = ARRAY_SIZE(max2175_ctrl_eu_rx_modes) - 1,
	.def = 0,
	.qmenu = max2175_ctrl_eu_rx_modes,
};

static const struct v4l2_ctrl_config max2175_na_rx_mode = {
	.ops = &max2175_ctrl_ops,
	.id = V4L2_CID_MAX2175_RX_MODE,
	.name = "RX Mode",
	.type = V4L2_CTRL_TYPE_MENU,
	.max = ARRAY_SIZE(max2175_ctrl_na_rx_modes) - 1,
	.def = 0,
	.qmenu = max2175_ctrl_na_rx_modes,
};

static int max2175_refout_load_to_bits(struct i2c_client *client, u32 load,
				       u32 *bits)
{
	if (load <= 40)
		*bits = load / 10;
	else if (load >= 60 && load <= 70)
		*bits = load / 10 - 1;
	else
		return -EINVAL;

	return 0;
}

static int max2175_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	bool master = true, am_hiz = false;
	u32 refout_load, refout_bits = 0;	/* REFOUT disabled */
	struct v4l2_ctrl_handler *hdl;
	struct fwnode_handle *fwnode;
	struct device_node *np;
	struct v4l2_subdev *sd;
	struct regmap *regmap;
	struct max2175 *ctx;
	struct clk *clk;
	int ret;

	/* Parse DT properties */
	np = of_parse_phandle(client->dev.of_node, "maxim,master", 0);
	if (np) {
		master = false;			/* Slave tuner */
		of_node_put(np);
	}

	fwnode = of_fwnode_handle(client->dev.of_node);
	if (fwnode_property_present(fwnode, "maxim,am-hiz-filter"))
		am_hiz = true;

	if (!fwnode_property_read_u32(fwnode, "maxim,refout-load",
				      &refout_load)) {
		ret = max2175_refout_load_to_bits(client, refout_load,
						  &refout_bits);
		if (ret) {
			dev_err(&client->dev, "invalid refout_load %u\n",
				refout_load);
			return -EINVAL;
		}
	}

	clk = devm_clk_get(&client->dev, NULL);
	if (IS_ERR(clk)) {
		ret = PTR_ERR(clk);
		dev_err(&client->dev, "cannot get clock %d\n", ret);
		return ret;
	}

	regmap = devm_regmap_init_i2c(client, &max2175_regmap_config);
	if (IS_ERR(regmap)) {
		ret = PTR_ERR(regmap);
		dev_err(&client->dev, "regmap init failed %d\n", ret);
		return -ENODEV;
	}

	/* Alloc tuner context */
	ctx = devm_kzalloc(&client->dev, sizeof(*ctx), GFP_KERNEL);
	if (ctx == NULL)
		return -ENOMEM;

	sd = &ctx->sd;
	ctx->master = master;
	ctx->am_hiz = am_hiz;
	ctx->mode_resolved = false;
	ctx->regmap = regmap;
	ctx->xtal_freq = clk_get_rate(clk);
	dev_info(&client->dev, "xtal freq %luHz\n", ctx->xtal_freq);

	v4l2_i2c_subdev_init(sd, client, &max2175_ops);
	ctx->client = client;

	sd->flags = V4L2_SUBDEV_FL_HAS_DEVNODE;

	/* Controls */
	hdl = &ctx->ctrl_hdl;
	ret = v4l2_ctrl_handler_init(hdl, 7);
	if (ret)
		return ret;

	ctx->lna_gain = v4l2_ctrl_new_std(hdl, &max2175_ctrl_ops,
					  V4L2_CID_RF_TUNER_LNA_GAIN,
					  0, 63, 1, 0);
	ctx->lna_gain->flags |= (V4L2_CTRL_FLAG_VOLATILE |
				 V4L2_CTRL_FLAG_READ_ONLY);
	ctx->if_gain = v4l2_ctrl_new_std(hdl, &max2175_ctrl_ops,
					 V4L2_CID_RF_TUNER_IF_GAIN,
					 0, 31, 1, 0);
	ctx->if_gain->flags |= (V4L2_CTRL_FLAG_VOLATILE |
				V4L2_CTRL_FLAG_READ_ONLY);
	ctx->pll_lock = v4l2_ctrl_new_std(hdl, &max2175_ctrl_ops,
					  V4L2_CID_RF_TUNER_PLL_LOCK,
					  0, 1, 1, 0);
	ctx->pll_lock->flags |= (V4L2_CTRL_FLAG_VOLATILE |
				 V4L2_CTRL_FLAG_READ_ONLY);
	ctx->i2s_en = v4l2_ctrl_new_custom(hdl, &max2175_i2s_en, NULL);
	ctx->hsls = v4l2_ctrl_new_custom(hdl, &max2175_hsls, NULL);

	if (ctx->xtal_freq == MAX2175_EU_XTAL_FREQ) {
		ctx->rx_mode = v4l2_ctrl_new_custom(hdl,
						    &max2175_eu_rx_mode, NULL);
		ctx->rx_modes = eu_rx_modes;
		ctx->bands_rf = &eu_bands_rf;
	} else {
		ctx->rx_mode = v4l2_ctrl_new_custom(hdl,
						    &max2175_na_rx_mode, NULL);
		ctx->rx_modes = na_rx_modes;
		ctx->bands_rf = &na_bands_rf;
	}
	ctx->sd.ctrl_handler = &ctx->ctrl_hdl;

	/* Set the defaults */
	ctx->freq = ctx->bands_rf->rangelow;

	/* Register subdev */
	ret = v4l2_async_register_subdev(sd);
	if (ret) {
		dev_err(&client->dev, "register subdev failed\n");
		goto err_reg;
	}

	/* Initialize device */
	ret = max2175_core_init(ctx, refout_bits);
	if (ret)
		goto err_init;

	ret = v4l2_ctrl_handler_setup(hdl);
	if (ret)
		goto err_init;

	return 0;

err_init:
	v4l2_async_unregister_subdev(sd);
err_reg:
	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);

	return ret;
}

static int max2175_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct max2175 *ctx = max2175_from_sd(sd);

	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);
	v4l2_async_unregister_subdev(sd);

	return 0;
}

static const struct i2c_device_id max2175_id[] = {
	{ DRIVER_NAME, 0},
	{},
};
MODULE_DEVICE_TABLE(i2c, max2175_id);

static const struct of_device_id max2175_of_ids[] = {
	{ .compatible = "maxim,max2175", },
	{ }
};
MODULE_DEVICE_TABLE(of, max2175_of_ids);

static struct i2c_driver max2175_driver = {
	.driver = {
		.name	= DRIVER_NAME,
		.of_match_table = max2175_of_ids,
	},
	.probe		= max2175_probe,
	.remove		= max2175_remove,
	.id_table	= max2175_id,
};

module_i2c_driver(max2175_driver);

MODULE_DESCRIPTION("Maxim MAX2175 RF to Bits tuner driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>");