[RFC 1/5] media: i2c: max2175: Add MAX2175 support

[Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>]

This patch adds driver support for MAX2175 chip. This is Maxim
Integrated's RF to Bits tuner front end chip designed for software-defined
radio solutions. This driver exposes the tuner as a sub-device instance
with standard and custom controls to configure the device.

Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
---
 .../devicetree/bindings/media/i2c/max2175.txt      |   60 +
 drivers/media/i2c/Kconfig                          |    4 +
 drivers/media/i2c/Makefile                         |    2 +
 drivers/media/i2c/max2175/Kconfig                  |    8 +
 drivers/media/i2c/max2175/Makefile                 |    4 +
 drivers/media/i2c/max2175/max2175.c                | 1624 ++++++++++++++++++++
 drivers/media/i2c/max2175/max2175.h                |  124 ++
 7 files changed, 1826 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/max2175.txt
 create mode 100644 drivers/media/i2c/max2175/Kconfig
 create mode 100644 drivers/media/i2c/max2175/Makefile
 create mode 100644 drivers/media/i2c/max2175/max2175.c
 create mode 100644 drivers/media/i2c/max2175/max2175.h

diff --git a/Documentation/devicetree/bindings/media/i2c/max2175.txt b/Documentation/devicetree/bindings/media/i2c/max2175.txt
new file mode 100644
index 0000000..2250d5f
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/max2175.txt
@@ -0,0 +1,60 @@
+Maxim Integrated MAX2175 RF to Bits tuner
+-----------------------------------------
+
+The MAX2175 IC is an advanced analog/digital hybrid-radio receiver with
+RF to Bits® front-end designed for software-defined radio solutions.
+
+Required properties:
+--------------------
+- compatible: "maxim,max2175" for MAX2175 RF-to-bits tuner.
+- clocks: phandle to the fixed xtal clock.
+- clock-names: name of the fixed xtal clock.
+- port: video interface child port node of a tuner that defines the local
+  and remote endpoints. The remote endpoint is assumed to be an SDR device
+  that is capable of receiving the digital samples from the tuner.
+
+Optional properties:
+--------------------
+- maxim,slave	   : empty property indicates this is a slave of another
+		     master tuner. This is used to define two tuners in
+		     diversity mode (1 master, 1 slave). By default each
+		     tuner is an individual master.
+- maxim,refout-load: load capacitance value (in pF) on reference output
+		     drive level. The mapping of these load values to
+		     respective bit values are given below.
+		     0 - Reference output disabled
+		     1 - 10pF load
+		     2 - 20pF load
+		     3 - 30pF load
+		     4 - 40pF load
+		     5 - 60pF load
+		     6 - 70pF load
+
+Example:
+--------
+
+Board specific DTS file
+
+/* Fixed XTAL clock node */
+maxim_xtal: maximextal {
+	compatible = "fixed-clock";
+	#clock-cells = <0>;
+	clock-frequency = <36864000>;
+};
+
+/* A tuner device instance under i2c bus */
+max2175_0: tuner@60 {
+	#clock-cells = <0>;
+	compatible = "maxim,max2175";
+	reg = <0x60>;
+	clocks = <&maxim_xtal>;
+	clock-names = "xtal";
+	maxim,refout-load = <10>;
+
+	port {
+		max2175_0_ep: endpoint {
+			remote-endpoint = <&slave_rx_v4l2_sdr_device>;
+		};
+	};
+
+};
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 2669b4b..66c73b0 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -749,6 +749,10 @@ config VIDEO_SAA6752HS
 	  To compile this driver as a module, choose M here: the
 	  module will be called saa6752hs.
 
+comment "SDR tuner chips"
+
+source "drivers/media/i2c/max2175/Kconfig"
+
 comment "Miscellaneous helper chips"
 
 config VIDEO_THS7303
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 92773b2..cfae721 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -6,6 +6,8 @@ obj-$(CONFIG_VIDEO_CX25840) += cx25840/
 obj-$(CONFIG_VIDEO_M5MOLS)	+= m5mols/
 obj-y				+= soc_camera/
 
+obj-$(CONFIG_SDR_MAX2175) 	+= max2175/
+
 obj-$(CONFIG_VIDEO_APTINA_PLL) += aptina-pll.o
 obj-$(CONFIG_VIDEO_TVAUDIO) += tvaudio.o
 obj-$(CONFIG_VIDEO_TDA7432) += tda7432.o
diff --git a/drivers/media/i2c/max2175/Kconfig b/drivers/media/i2c/max2175/Kconfig
new file mode 100644
index 0000000..a8a0664
--- /dev/null
+++ b/drivers/media/i2c/max2175/Kconfig
@@ -0,0 +1,8 @@
+config SDR_MAX2175
+	tristate "Maxim 2175 RF to Bits tuner"
+	depends on VIDEO_V4L2 && MEDIA_SDR_SUPPORT && I2C && VIDEO_V4L2_SUBDEV_API
+	---help---
+	  Support for Maxim 2175 tuner
+
+	  To compile this driver as a module, choose M here; the
+	  module will be called max2175.
diff --git a/drivers/media/i2c/max2175/Makefile b/drivers/media/i2c/max2175/Makefile
new file mode 100644
index 0000000..9bb46ac
--- /dev/null
+++ b/drivers/media/i2c/max2175/Makefile
@@ -0,0 +1,4 @@
+#
+# Makefile for Maxim RF to Bits tuner device
+#
+obj-$(CONFIG_SDR_MAX2175) += max2175.o
diff --git a/drivers/media/i2c/max2175/max2175.c b/drivers/media/i2c/max2175/max2175.c
new file mode 100644
index 0000000..71b60c2
--- /dev/null
+++ b/drivers/media/i2c/max2175/max2175.c
@@ -0,0 +1,1624 @@
+/*
+ * 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 chip.
+ *
+ * Copyright (C) 2016 Maxim Integrated Products
+ * Copyright (C) 2016 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/errno.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-of.h>
+
+#include "max2175.h"
+
+#define DRIVER_NAME "max2175"
+
+static unsigned int max2175_debug;
+module_param(max2175_debug, uint, 0644);
+MODULE_PARM_DESC(max2175_debug, "activate debug info");
+
+#define mxm_dbg(ctx, fmt, arg...) \
+	v4l2_dbg(1, max2175_debug, &ctx->sd, fmt, ## arg)
+
+/* NOTE: Any addition/deletion in the below list should be reflected in
+ * max2175_modetag enum
+ */
+static const struct max2175_rxmode eu_rx_modes[] = { /* Indexed by EU modetag */
+	/* EU modes */
+	{ MAX2175_BAND_VHF, 182640000, 0, { 0, 0, 0, 0 } },
+};
+
+static const struct max2175_rxmode na_rx_modes[] = { /* Indexed by NA modetag */
+	/* NA modes */
+	{ MAX2175_BAND_FM, 98255520, 1, { 0, 0, 0, 0 } },
+};
+
+/* 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,
+};
+
+static const struct max2175_regmap 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 },
+};
+
+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,
+	},
+};
+
+/* Custom controls */
+#define V4L2_CID_MAX2175_I2S_EN		(V4L2_CID_USER_MAX217X_BASE + 0x01)
+#define V4L2_CID_MAX2175_I2S_MODE	(V4L2_CID_USER_MAX217X_BASE + 0x02)
+#define V4L2_CID_MAX2175_AM_HIZ		(V4L2_CID_USER_MAX217X_BASE + 0x03)
+#define V4L2_CID_MAX2175_HSLS		(V4L2_CID_USER_MAX217X_BASE + 0x04)
+#define V4L2_CID_MAX2175_RX_MODE	(V4L2_CID_USER_MAX217X_BASE + 0x05)
+
+/* Tuner bands */
+static const struct v4l2_frequency_band bands_rf = {
+	.tuner = 0,
+	.type = V4L2_TUNER_RF,
+	.index = 0,
+	.capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
+	.rangelow   = 160000000,
+	.rangehigh  = 240000000,
+};
+
+struct max2175_ctx {
+	struct v4l2_subdev sd;
+	struct i2c_client *client;
+	struct device *dev;
+
+	/* Cached configuration */
+	u8 regs[256];
+	enum max2175_modetag mode;	/* Receive mode tag */
+	u32 freq;			/* In Hz */
+	struct max2175_rxmode *rx_modes;
+
+	/* Device settings */
+	bool master;
+	u32 decim_ratio;
+	u64 xtal_freq;
+
+	/* ROM values */
+	u8 rom_bbf_bw_am;
+	u8 rom_bbf_bw_fm;
+	u8 rom_bbf_bw_dab;
+
+	/* Local copy of old settings */
+	u8 i2s_test;
+
+	u8 nbd_gain;
+	u8 nbd_threshold;
+	u8 wbd_gain;
+	u8 wbd_threshold;
+	u8 bbd_threshold;
+	u8 bbdclip_threshold;
+	u8 lt_wbd_threshold;
+	u8 lt_wbd_gain;
+
+	/* 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 *i2s_mode;	/* I2S mode value */
+	struct v4l2_ctrl *am_hiz;	/* AM High impledance input */
+	struct v4l2_ctrl *hsls;		/* High-side/Low-side polarity */
+	struct v4l2_ctrl *rx_mode;	/* Receive mode */
+
+	/* Driver private variables */
+	bool mode_resolved;		/* Flag to sanity check settings */
+};
+
+/* Helpers */
+
+static int max2175_reg_write(struct max2175_ctx *ctx, u8 idx, u8 val)
+{
+	int ret;
+
+	ret = i2c_smbus_write_byte_data(ctx->client, idx, val);
+	if (ret) {
+		v4l2_err(ctx->client,
+			 "write: idx 0x%02x, val 0x%02x\n", idx, val);
+		return ret;
+	}
+
+	/* Update local store */
+	ctx->regs[idx] = val;
+	if (max2175_debug >= 2)
+		mxm_dbg(ctx, "write: reg[0x%02x] = 0x%02x\n", idx, val);
+
+	return ret;
+}
+
+static int max2175_reg_read(struct max2175_ctx *ctx, u8 idx)
+{
+	int ret;
+
+	ret = i2c_smbus_read_byte_data(ctx->client, idx);
+	if (ret < 0) {
+		v4l2_err(ctx->client, "read: idx 0x%02x\n", idx);
+		return ret;
+	}
+
+	if (max2175_debug >= 2)
+		mxm_dbg(ctx, "read: reg[0x%02x] = 0x%02x\n", idx, ret);
+
+	return ret;
+}
+
+/* Flush local copy to device from idx to idx+len (inclusive) */
+static void max2175_flush_regstore(struct max2175_ctx *ctx, u8 idx, u8 len)
+{
+	u8 i;
+
+	for (i = idx; i <= len; i++)
+		max2175_reg_write(ctx, i, ctx->regs[i]);
+}
+
+/* General bitops helpers */
+static inline u8  __max2175_get_bits(u8 val, u8 msb, u8 lsb)
+{
+	return ((val & GENMASK(msb, lsb)) >> lsb);
+}
+
+static inline u8  __max2175_set_bits(u8 val, u8 msb, u8 lsb, u8 newval)
+{
+	u8 mask = GENMASK(msb, lsb);
+
+	return ((val & ~mask) | ((newval << lsb) & mask));
+}
+
+/* Local store bitops helpers */
+static u8 max2175_get_bits(struct max2175_ctx *ctx, u8 idx, u8 msb, u8 lsb)
+{
+	if (max2175_debug >= 2)
+		mxm_dbg(ctx, "get_bits: idx:%u msb:%u lsb:%u\n",
+			idx, msb, lsb);
+	return __max2175_get_bits(ctx->regs[idx], msb, lsb);
+}
+
+static bool max2175_get_bit(struct max2175_ctx *ctx, u8 idx, u8 bit)
+{
+	return !!max2175_get_bits(ctx, idx, bit, bit);
+}
+
+static void max2175_set_bits(struct max2175_ctx *ctx, u8 idx,
+		      u8 msb, u8 lsb, u8 newval)
+{
+	if (max2175_debug >= 2)
+		mxm_dbg(ctx, "set_bits: idx:%u msb:%u lsb:%u newval:%u\n",
+			idx, msb, lsb, newval);
+	ctx->regs[idx] = __max2175_set_bits(ctx->regs[idx], msb, lsb,
+					      newval);
+}
+
+static void max2175_set_bit(struct max2175_ctx *ctx, u8 idx, u8 bit, u8 newval)
+{
+	max2175_set_bits(ctx, idx, bit, bit, newval);
+}
+
+/* Device register bitops helpers */
+static u8 max2175_read_bits(struct max2175_ctx *ctx, u8 idx, u8 msb, u8 lsb)
+{
+	return __max2175_get_bits(max2175_reg_read(ctx, idx), msb, lsb);
+}
+
+static void max2175_write_bits(struct max2175_ctx *ctx, u8 idx, u8 msb,
+			u8 lsb, u8 newval)
+{
+	/* Update local copy & write to device */
+	max2175_set_bits(ctx, idx, msb, lsb, newval);
+	max2175_reg_write(ctx, idx, ctx->regs[idx]);
+}
+
+static void max2175_write_bit(struct max2175_ctx *ctx, u8 idx, u8 bit,
+			      u8 newval)
+{
+	if (max2175_debug >= 2)
+		mxm_dbg(ctx, "idx %u, bit %u, newval %u\n", idx, bit, newval);
+	max2175_write_bits(ctx, idx, bit, bit, newval);
+}
+
+static int max2175_poll_timeout(struct max2175_ctx *ctx, u8 idx, u8 msb, u8 lsb,
+				u8 exp_val, u32 timeout)
+{
+	unsigned long end = jiffies + msecs_to_jiffies(timeout);
+	int ret;
+
+	do {
+		ret = max2175_read_bits(ctx, idx, msb, lsb);
+		if (ret < 0)
+			return ret;
+		if (ret == exp_val)
+			return 0;
+
+		usleep_range(1000, 1500);
+	} while (time_is_after_jiffies(end));
+
+	return -EBUSY;
+}
+
+static int max2175_poll_csm_ready(struct max2175_ctx *ctx)
+{
+	return max2175_poll_timeout(ctx, 69, 1, 1, 0, 50);
+}
+
+#define MAX2175_IS_BAND_AM(ctx)		\
+	(max2175_get_bits(ctx, 5, 1, 0) == MAX2175_BAND_AM)
+
+#define MAX2175_IS_FM_MODE(ctx)		\
+	(max2175_get_bits(ctx, 12, 5, 4) == 0)
+
+#define MAX2175_IS_FMHD_MODE(ctx)	\
+	(max2175_get_bits(ctx, 12, 5, 4) == 1)
+
+#define MAX2175_IS_DAB_MODE(ctx)	\
+	(max2175_get_bits(ctx, 12, 5, 4) == 2)
+
+static int max2175_band_from_freq(u64 freq)
+{
+	if (freq >= 144000 && freq <= 26100000)
+		return MAX2175_BAND_AM;
+	else if (freq >= 65000000 && freq <= 108000000)
+		return MAX2175_BAND_FM;
+	else if (freq >= 160000000 && freq <= 240000000)
+		return MAX2175_BAND_VHF;
+
+	/* Add other bands on need basis */
+	return -ENOTSUPP;
+}
+
+static int max2175_update_i2s_mode(struct max2175_ctx *ctx, u32 i2s_mode)
+{
+	/* Only change if it's new */
+	if (max2175_read_bits(ctx, 29, 2, 0) == i2s_mode)
+		return 0;
+
+	max2175_write_bits(ctx, 29, 2, 0, i2s_mode);
+
+	/* Based on I2S mode value I2S_WORD_CNT values change */
+	if (i2s_mode == MAX2175_I2S_MODE3) {
+		max2175_write_bits(ctx, 30, 6, 0, 1);
+	} else if (i2s_mode == MAX2175_I2S_MODE2 ||
+		   i2s_mode == MAX2175_I2S_MODE4) {
+		max2175_write_bits(ctx, 30, 6, 0, 0);
+	} else if (i2s_mode == MAX2175_I2S_MODE0) {
+		max2175_write_bits(ctx, 30, 6, 0,
+				   ctx->rx_modes[ctx->mode].i2s_word_size);
+	} else {
+		v4l2_err(ctx->client,
+			 "failed: i2s_mode %u unsupported\n", i2s_mode);
+		return 1;
+	}
+	mxm_dbg(ctx, "updated i2s_mode %u\n", i2s_mode);
+	return 0;
+}
+
+static void max2175_i2s_enable(struct max2175_ctx *ctx, bool enable)
+{
+	if (enable) {
+		/* Use old setting */
+		max2175_write_bits(ctx, 104, 3, 0, ctx->i2s_test);
+	} else {
+		/* Cache old setting */
+		ctx->i2s_test = max2175_read_bits(ctx, 104, 3, 0);
+		max2175_write_bits(ctx, 104, 3, 0, 1);
+	}
+	mxm_dbg(ctx, "i2s %s: old val %u\n", enable ? "enabled" : "disabled",
+		ctx->i2s_test);
+}
+
+static void max2175_set_filter_coeffs(struct max2175_ctx *ctx, u8 m_sel,
+				      u8 bank, const u16 *coeffs)
+{
+	u8 i, coeff_addr, upper_address;
+
+	mxm_dbg(ctx, "start: 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;
+	else
+		upper_address = 24;
+
+	max2175_set_bit(ctx, 117, 7, 1);
+	for (i = 0; i < upper_address; i++) {
+		coeff_addr = i + (bank * 24);
+		max2175_set_bits(ctx, 115, 7, 0,
+				 (u8)((coeffs[i] >> 8) & 0xff));
+		max2175_set_bits(ctx, 116, 7, 0, (u8)(coeffs[i] & 0xff));
+		max2175_set_bits(ctx, 117, 6, 0, coeff_addr);
+		max2175_flush_regstore(ctx, 115, 3);
+	}
+	max2175_write_bit(ctx, 117, 7, 0);
+}
+
+static void max2175_load_dab_1p2(struct max2175_ctx *ctx)
+{
+	u32 i;
+
+	/* Master is already set on init */
+	for (i = 0; i < ARRAY_SIZE(dab12_map); i++)
+		max2175_reg_write(ctx, dab12_map[i].idx, dab12_map[i].val);
+
+	/* The default settings assume master */
+	if (!ctx->master)
+		max2175_write_bit(ctx, 30, 7, 1);
+
+	/* Cache i2s_test value at this point */
+	ctx->i2s_test = max2175_get_bits(ctx, 104, 3, 0);
+	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_set_bbfilter(struct max2175_ctx *ctx)
+{
+	if (MAX2175_IS_BAND_AM(ctx)) {
+		max2175_write_bits(ctx, 12, 3, 0, ctx->rom_bbf_bw_am);
+		mxm_dbg(ctx, "max2175_set_bbfilter: AM: rom value = %d\n",
+			ctx->rom_bbf_bw_am);
+	} else {
+		/* FM or DAB mode */
+		if (MAX2175_IS_DAB_MODE(ctx)) {
+			/* DAB mode. Load ROM values */
+			max2175_write_bits(ctx, 12, 3, 0, ctx->rom_bbf_bw_dab);
+			mxm_dbg(ctx, "max2175_set_bbfilter: DAB: rom value = %d\n",
+				ctx->rom_bbf_bw_dab);
+		} else {
+			/* FM or FM HD mode. Load ROM values */
+			max2175_write_bits(ctx, 12, 3, 0, ctx->rom_bbf_bw_fm);
+			mxm_dbg(ctx, "max2175_set_bbfilter: FM: rom value = %d\n",
+				ctx->rom_bbf_bw_fm);
+		}
+	}
+}
+
+static bool max2175_set_csm_mode(struct max2175_ctx *ctx,
+			  enum max2175_csm_mode new_mode)
+{
+	int ret = max2175_poll_csm_ready(ctx);
+
+	if (ret) {
+		v4l2_err(ctx->client, "csm not ready: new mode %d\n", new_mode);
+		return ret;
+	}
+
+	mxm_dbg(ctx, "set csm mode: new mode %d\n", new_mode);
+
+	max2175_write_bits(ctx, 0, 2, 0, new_mode);
+
+	/* Wait for a fixed settle down time depending on new mode and band */
+	switch (new_mode) {
+	case MAX2175_CSM_MODE_JUMP_FAST_TUNE:
+		if (MAX2175_IS_BAND_AM(ctx)) {
+			usleep_range(1250, 1500);	/* 1.25ms */
+		} else {
+			if (MAX2175_IS_DAB_MODE(ctx))
+				usleep_range(3000, 3500);	/* 3ms */
+			else
+				usleep_range(1250, 1500);	/* 1.25ms */
+		}
+		break;
+
+	/* Other mode switches can be added in the future if needed */
+	default:
+		break;
+	}
+
+	ret = max2175_poll_csm_ready(ctx);
+	if (ret) {
+		v4l2_err(ctx->client, "csm did not settle: new mode %d\n",
+			 new_mode);
+		return ret;
+	}
+	return ret;
+}
+
+static int max2175_csm_action(struct max2175_ctx *ctx,
+			      enum max2175_csm_mode action)
+{
+	int ret;
+	int load_buffer = MAX2175_CSM_MODE_LOAD_TO_BUFFER;
+
+	mxm_dbg(ctx, "csm action: %d\n", action);
+
+	/* Perform one or two CSM mode commands. */
+	switch (action)	{
+	case MAX2175_CSM_MODE_NO_ACTION:
+		/* Take no FSM Action. */
+		return 0;
+	case MAX2175_CSM_MODE_LOAD_TO_BUFFER:
+	case MAX2175_CSM_MODE_PRESET_TUNE:
+	case MAX2175_CSM_MODE_SEARCH:
+	case MAX2175_CSM_MODE_AF_UPDATE:
+	case MAX2175_CSM_MODE_JUMP_FAST_TUNE:
+	case MAX2175_CSM_MODE_CHECK:
+	case MAX2175_CSM_MODE_LOAD_AND_SWAP:
+	case MAX2175_CSM_MODE_END:
+		ret = max2175_set_csm_mode(ctx, action);
+		break;
+	case MAX2175_CSM_MODE_BUFFER_PLUS_PRESET_TUNE:
+		ret = max2175_set_csm_mode(ctx, load_buffer);
+		if (ret) {
+			v4l2_err(ctx->client, "csm action %d load buf failed\n",
+				 action);
+			break;
+		}
+		ret = max2175_set_csm_mode(ctx, MAX2175_CSM_MODE_PRESET_TUNE);
+		break;
+	case MAX2175_CSM_MODE_BUFFER_PLUS_SEARCH:
+		ret = max2175_set_csm_mode(ctx, load_buffer);
+		if (ret) {
+			v4l2_err(ctx->client, "csm action %d load buf failed\n",
+				 action);
+			break;
+		}
+		ret = max2175_set_csm_mode(ctx, MAX2175_CSM_MODE_SEARCH);
+		break;
+	case MAX2175_CSM_MODE_BUFFER_PLUS_AF_UPDATE:
+		ret = max2175_set_csm_mode(ctx, load_buffer);
+		if (ret) {
+			v4l2_err(ctx->client, "csm action %d load buf failed\n",
+				 action);
+			break;
+		}
+		ret = max2175_set_csm_mode(ctx, MAX2175_CSM_MODE_AF_UPDATE);
+		break;
+	case MAX2175_CSM_MODE_BUFFER_PLUS_JUMP_FAST_TUNE:
+		ret = max2175_set_csm_mode(ctx, load_buffer);
+		if (ret) {
+			v4l2_err(ctx->client, "csm action %d load buf failed\n",
+				 action);
+			break;
+		}
+		ret = max2175_set_csm_mode(ctx,
+					   MAX2175_CSM_MODE_JUMP_FAST_TUNE);
+		break;
+	case MAX2175_CSM_MODE_BUFFER_PLUS_CHECK:
+		ret = max2175_set_csm_mode(ctx, load_buffer);
+		if (ret) {
+			v4l2_err(ctx->client, "csm action %d load buf failed\n",
+				 action);
+			break;
+		}
+		ret = max2175_set_csm_mode(ctx, MAX2175_CSM_MODE_CHECK);
+		break;
+	case MAX2175_CSM_MODE_BUFFER_PLUS_LOAD_AND_SWAP:
+		ret = max2175_set_csm_mode(ctx, load_buffer);
+		if (ret) {
+			v4l2_err(ctx->client, "csm action %d load buf failed\n",
+				 action);
+			break;
+		}
+		ret = max2175_set_csm_mode(ctx, MAX2175_CSM_MODE_LOAD_AND_SWAP);
+		break;
+	default:
+		ret = max2175_set_csm_mode(ctx, MAX2175_CSM_MODE_NO_ACTION);
+		break;
+	}
+	return ret;
+}
+
+static int max2175_set_lo_freq(struct max2175_ctx *ctx, u64 lo_freq)
+{
+	int ret;
+	u32 lo_mult;
+	u64 scaled_lo_freq;
+	const u64 scale_factor = 1000000ULL;
+	u64 scaled_npf, scaled_integer, scaled_fraction;
+	u32 frac_desired, int_desired;
+	u8 loband_bits, vcodiv_bits;
+
+	scaled_lo_freq = lo_freq;
+	/* Scale to larger number for precision */
+	scaled_lo_freq = scaled_lo_freq * scale_factor * 100;
+
+	mxm_dbg(ctx, "scaled lo_freq %llu lo_freq %llu\n",
+		scaled_lo_freq, lo_freq);
+
+	if (MAX2175_IS_BAND_AM(ctx)) {
+		if (max2175_get_bit(ctx, 5, 7) == 0)
+			loband_bits = 0;
+			vcodiv_bits = 0;
+			lo_mult = 16;
+	} else if (max2175_get_bits(ctx, 5, 1, 0) == MAX2175_BAND_FM) {
+		if (lo_freq <= 74700000) {
+			loband_bits = 0;
+			vcodiv_bits = 0;
+			lo_mult = 16;
+		} else if ((lo_freq > 74700000) && (lo_freq <= 110000000)) {
+			loband_bits = 1;
+			vcodiv_bits = 0;
+		} else {
+			loband_bits = 1;
+			vcodiv_bits = 3;
+		}
+		lo_mult = 8;
+	} else if (max2175_get_bits(ctx, 5, 1, 0) == MAX2175_BAND_VHF) {
+		if (lo_freq <= 210000000) {
+			loband_bits = 2;
+			vcodiv_bits = 2;
+		} else {
+			loband_bits = 2;
+			vcodiv_bits = 1;
+		}
+		lo_mult = 4;
+	} else {
+		loband_bits = 3;
+		vcodiv_bits = 2;
+		lo_mult = 2;
+	}
+
+	if (max2175_get_bits(ctx, 5, 1, 0) == MAX2175_BAND_L)
+		scaled_npf = (scaled_lo_freq / ctx->xtal_freq / lo_mult) / 100;
+	else
+		scaled_npf = (scaled_lo_freq / ctx->xtal_freq * lo_mult) / 100;
+
+	scaled_integer = scaled_npf / scale_factor * scale_factor;
+	int_desired = (u32)(scaled_npf / scale_factor);
+	scaled_fraction = scaled_npf - scaled_integer;
+	frac_desired = (u32)(scaled_fraction * 1048576 / scale_factor);
+
+	/* Check CSM is not busy */
+	ret = max2175_poll_csm_ready(ctx);
+	if (ret) {
+		v4l2_err(ctx->client, "lo_freq: csm busy. freq %llu\n",
+			 lo_freq);
+		return ret;
+	}
+
+	mxm_dbg(ctx, "loband %u vcodiv %u lo_mult %u scaled_npf %llu\n",
+		loband_bits, vcodiv_bits, lo_mult, scaled_npf);
+	mxm_dbg(ctx, "scaled int %llu frac %llu desired int %u frac %u\n",
+		scaled_integer, scaled_fraction, int_desired, frac_desired);
+
+	/* Write the calculated values to the appropriate registers */
+	max2175_set_bits(ctx, 5, 3, 2, loband_bits);
+	max2175_set_bits(ctx, 6, 7, 6, vcodiv_bits);
+	max2175_set_bits(ctx, 1, 7, 0, (u8)(int_desired & 0xff));
+	max2175_set_bits(ctx, 2, 3, 0, (u8)((frac_desired >> 16) & 0x1f));
+	max2175_set_bits(ctx, 3, 7, 0, (u8)((frac_desired >> 8) & 0xff));
+	max2175_set_bits(ctx, 4, 7, 0, (u8)(frac_desired & 0xff));
+	/* Flush the above registers to device */
+	max2175_flush_regstore(ctx, 1, 6);
+	return ret;
+}
+
+static int max2175_set_nco_freq(struct max2175_ctx *ctx, s64 nco_freq_desired)
+{
+	int ret;
+	u64 clock_rate, abs_nco_freq;
+	s64  nco_freq, nco_val_desired;
+	u32 nco_reg;
+	const u64 scale_factor = 1000000ULL;
+
+	mxm_dbg(ctx, "nco_freq: freq = %lld\n", nco_freq_desired);
+	clock_rate = ctx->xtal_freq / ctx->decim_ratio;
+	nco_freq = -nco_freq_desired;
+
+	if (nco_freq < 0)
+		abs_nco_freq = -nco_freq;
+	else
+		abs_nco_freq = nco_freq;
+
+	/* Scale up the values for precision */
+	if (abs_nco_freq < (clock_rate / 2)) {
+		nco_val_desired = (2 * nco_freq * scale_factor) / clock_rate;
+	} else {
+		if (nco_freq < 0)
+			nco_val_desired = (-2 * (clock_rate - abs_nco_freq) *
+				scale_factor) / clock_rate;
+		else
+			nco_val_desired = (2 * (clock_rate - abs_nco_freq) *
+				scale_factor) / clock_rate;
+	}
+
+	/* Scale down to get the fraction */
+	if (nco_freq < 0)
+		nco_reg = 0x200000 + ((nco_val_desired * 1048576) /
+				      scale_factor);
+	else
+		nco_reg = (nco_val_desired * 1048576) / scale_factor;
+
+	/* Check CSM is not busy */
+	ret = max2175_poll_csm_ready(ctx);
+	if (ret) {
+		v4l2_err(ctx->client, "nco_freq: csm busy. freq %llu\n",
+			 nco_freq);
+		return ret;
+	}
+
+	mxm_dbg(ctx, "clk %llu decim %u abs %llu desired %lld reg %u\n",
+		clock_rate, ctx->decim_ratio, abs_nco_freq,
+		nco_val_desired, nco_reg);
+
+	/* Write the calculated values to the appropriate registers */
+	max2175_set_bits(ctx, 7, 4, 0, (u8)((nco_reg >> 16) & 0x1f));
+	max2175_set_bits(ctx, 8, 7, 0, (u8)((nco_reg >> 8) & 0xff));
+	max2175_set_bits(ctx, 9, 7, 0, (u8)(nco_reg & 0xff));
+	max2175_flush_regstore(ctx, 7, 3);  /* Send all 3 NCO registers. */
+	return ret;
+}
+
+static int max2175_set_rf_freq_non_am_bands(struct max2175_ctx *ctx, u64 freq,
+					    u32 lo_pos)
+{
+	int ret;
+	s64 adj_freq;
+	u64 low_if_freq;
+
+	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_get_bits(ctx, 5, 1, 0) == MAX2175_BAND_VHF) {
+		if (lo_pos == MAX2175_LO_ABOVE_DESIRED)
+			adj_freq = freq + low_if_freq;
+		else
+			adj_freq = freq - low_if_freq;
+	} else {
+		if (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 *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);
+
+	if (!ret)
+		mxm_dbg(ctx, "set rf_freq: freq = %llu. done\n", freq);
+
+	return ret;
+}
+
+static int max2175_tune_rf_freq(struct max2175_ctx *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_CSM_MODE_BUFFER_PLUS_JUMP_FAST_TUNE);
+	if (ret)
+		return ret;
+
+	mxm_dbg(ctx, "tuned rf_freq: old %u new %llu\n", ctx->freq, freq);
+	ctx->freq = freq;
+	return ret;
+}
+
+static void max2175_set_hsls(struct max2175_ctx *ctx, u32 lo_pos)
+{
+	mxm_dbg(ctx, "set_hsls: lo_pos = %u\n", lo_pos);
+
+	if (lo_pos == MAX2175_LO_BELOW_DESIRED)	{
+		if (max2175_get_bits(ctx, 5, 1, 0) == MAX2175_BAND_VHF)
+			max2175_write_bit(ctx, 5, 4, 1);
+		else
+			max2175_write_bit(ctx, 5, 4, 0);
+	} else {
+		if (max2175_get_bits(ctx, 5, 1, 0) == MAX2175_BAND_VHF)
+			max2175_write_bit(ctx, 5, 4, 0);
+		else
+			max2175_write_bit(ctx, 5, 4, 1);
+	}
+}
+
+static int max2175_set_rx_mode(struct max2175_ctx *ctx, u32 rx_mode,
+			       u32 am_hiz, u32 hsls)
+{
+	mxm_dbg(ctx, "receive mode: %u am_hiz %u\n", rx_mode, am_hiz);
+
+	switch (rx_mode) {
+	case MAX2175_DAB_1_2:
+		max2175_load_dab_1p2(ctx);
+		break;
+
+	/* Other modes can be added in future if needed */
+	default:
+		v4l2_err(ctx->client, "invalid rx_mode %u\n", rx_mode);
+		return -EINVAL;
+	}
+
+	if (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);
+	}
+
+	/* Store some of the initial values loaded, which will be needed at
+	 * a later stage
+	 */
+	ctx->nbd_threshold = max2175_get_bits(ctx, 14, 7, 4);
+	ctx->nbd_gain = max2175_get_bits(ctx, 16, 7, 5);
+	ctx->wbd_threshold = max2175_get_bits(ctx, 14, 3, 0);
+	ctx->wbd_gain = max2175_get_bits(ctx, 15, 5, 4);
+	ctx->bbd_threshold = max2175_get_bits(ctx, 15, 3, 0);
+	ctx->bbdclip_threshold = max2175_get_bits(ctx, 35, 7, 5);
+	ctx->lt_wbd_threshold = max2175_get_bits(ctx, 32, 3, 0);
+	ctx->lt_wbd_gain = max2175_get_bits(ctx, 32, 5, 4);
+
+	/* Load BB filter trim values saved in ROM */
+	max2175_set_bbfilter(ctx);
+
+	/* Set HSLS */
+	max2175_set_hsls(ctx, hsls);
+
+	ctx->mode = rx_mode;
+	ctx->mode_resolved = true;
+	return 0;
+}
+
+static bool max2175_is_i2s_rx_mode_valid(struct max2175_ctx *ctx,
+					 u32 mode, u32 i2s_mode)
+{
+	u32 i;
+
+	for (i = 0; i < ARRAY_SIZE(ctx->rx_modes[mode].i2s_modes); i++)
+		if (ctx->rx_modes[mode].i2s_modes[i] == i2s_mode)
+			return true;
+
+	v4l2_err(ctx->client, "i2s_mode %u not suitable for rx mode %u\n",
+		 i2s_mode, mode);
+	return false;
+}
+
+static int max2175_mode_from_freq(struct max2175_ctx *ctx, u32 freq, u32 *mode)
+{
+	u32 i;
+	int band;
+
+	band = max2175_band_from_freq(freq);
+	if (band < 0) {
+		v4l2_err(ctx->client, "mode from freq failed: %u ret %d\n",
+			 freq, band);
+		return 1;
+	}
+
+	/* 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, "mode from freq: freq %u mode %d\n",
+				freq, *mode);
+			return 0;
+		}
+	}
+	v4l2_err(ctx->client, "mode from freq failed: freq %u\n", freq);
+	return 1;
+}
+
+static bool max2175_is_freq_rx_mode_valid(struct max2175_ctx *ctx,
+					 u32 mode, u32 freq)
+{
+	int band;
+
+	band = max2175_band_from_freq(freq);
+	if (band < 0) {
+		v4l2_err(ctx->client, "freq rx mode failed: freq %u ret %d\n",
+			 freq, band);
+		return band;
+	}
+
+	mxm_dbg(ctx, "freq rx mode valid: freq %u mode %u\n", freq, mode);
+	return (ctx->rx_modes[mode].band == band);
+}
+
+static void max2175_load_adc_presets(struct max2175_ctx *ctx)
+{
+	u32 i;
+
+	for (i = 0; i < 2; i++) {
+		memcpy(&ctx->regs[146 + (i * 55)], &adc_presets[i][0], 23);
+		max2175_flush_regstore(ctx, 146 + (i * 55), 23);
+	}
+}
+
+static int max2175_init_power_manager(struct max2175_ctx *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, 50);
+	if (ret)
+		v4l2_err(ctx->client, "init pm failed\n");
+	return ret;
+}
+
+static int max2175_recalibrate_adc(struct max2175_ctx *ctx)
+{
+	int ret;
+
+	/* ADC Re-calibration */
+	max2175_reg_write(ctx, 150, 0xff);
+	max2175_reg_write(ctx, 205, 0xff);
+	max2175_reg_write(ctx, 147, 0x20);
+	max2175_reg_write(ctx, 147, 0x00);
+	max2175_reg_write(ctx, 202, 0x20);
+	max2175_reg_write(ctx, 202, 0x00);
+
+	ret = max2175_poll_timeout(ctx, 69, 4, 3, 3, 50);
+	if (ret)
+		v4l2_err(ctx->client, "adc recalibration failed\n");
+	return ret;
+}
+
+static u8 max2175_read_rom(struct max2175_ctx *ctx, u8 row)
+{
+	u8 data;
+
+	max2175_write_bit(ctx, 56, 4, 0);
+	max2175_write_bits(ctx, 56, 3, 0, row);
+	usleep_range(2000, 2500);
+
+	data = max2175_reg_read(ctx, 58);
+	max2175_write_bits(ctx, 56, 3, 0, 0);
+
+	mxm_dbg(ctx, "read rom: row 0x%02x, data 0x%02x\n", row, data);
+	return data;
+}
+
+static void max2175_load_from_rom(struct max2175_ctx *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) & 0xf);
+
+	data = max2175_read_rom(ctx, 1);
+	ctx->rom_bbf_bw_fm = (data & 0x0f);
+	ctx->rom_bbf_bw_dab = (data & 0xf0) >> 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->val) {
+		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_fm_eu_1p0_full(struct max2175_ctx *ctx)
+{
+	memcpy(&ctx->regs[1], full_fm_eu_1p0, sizeof(full_fm_eu_1p0));
+	ctx->decim_ratio = 36;
+}
+
+static void max2175_load_fm_na_1p0_full(struct max2175_ctx *ctx)
+{
+	memcpy(&ctx->regs[1], full_fm_na_1p0, sizeof(full_fm_na_1p0));
+	ctx->decim_ratio = 27;
+}
+
+static int max2175_core_init(struct max2175_ctx *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_fm_eu_1p0_full(ctx);
+	else
+		max2175_load_fm_na_1p0_full(ctx);
+
+	/* The default settings assume master */
+	if (!ctx->master)
+		max2175_set_bit(ctx, 30, 7, 1);
+
+	mxm_dbg(ctx, "refout_bits %u\n", refout_bits);
+	/* Set REFOUT */
+	max2175_set_bits(ctx, 56, 7, 5, refout_bits);
+
+	/* Send out all the registers to device except register 0 */
+	max2175_flush_regstore(ctx, 1, 145);
+	usleep_range(5000, 5500);
+
+	/* 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;
+	mxm_dbg(ctx, "init pm done\n");
+
+	/* Recalibrate ADC */
+	ret = max2175_recalibrate_adc(ctx);
+	if (ret)
+		return ret;
+	mxm_dbg(ctx, "adc recalibration done\n");
+
+	/* 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;
+}
+
+#define max2175_ctx_from_sd(x)	\
+	container_of(x, struct max2175_ctx, sd)
+#define max2175_ctx_from_ctrl(x)	\
+	container_of(x, struct max2175_ctx, ctrl_hdl)
+
+static void max2175_s_ctrl_i2s_mode(struct max2175_ctx *ctx, u32 i2s_mode)
+{
+	mxm_dbg(ctx, "s_ctrl_i2s_mode: %u resolved %d\n", i2s_mode,
+		ctx->mode_resolved);
+
+	/* Update i2s mode on device only when mode is resolved & it is valid
+	 * for the configured mode
+	 */
+	if (ctx->mode_resolved &&
+	    max2175_is_i2s_rx_mode_valid(ctx, ctx->mode, i2s_mode))
+		max2175_update_i2s_mode(ctx, i2s_mode);
+}
+
+static void max2175_s_ctrl_rx_mode(struct max2175_ctx *ctx, u32 rx_mode)
+{
+	int ret;
+
+	/* Load mode. Range check already done */
+	ret = max2175_set_rx_mode(ctx, rx_mode,
+				  ctx->am_hiz->val, ctx->hsls->val);
+	if (ret)
+		return;
+
+	/* Get current i2s_mode and update if needed for given rx_mode */
+	if (max2175_is_i2s_rx_mode_valid(ctx, rx_mode, ctx->i2s_mode->val))
+		max2175_update_i2s_mode(ctx, ctx->i2s_mode->val);
+	else
+		ctx->i2s_mode->val = max2175_read_bits(ctx, 29, 2, 0);
+
+	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_is_freq_rx_mode_valid(ctx, rx_mode, ctx->freq))
+		max2175_tune_rf_freq(ctx, ctx->freq, ctx->hsls->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->val);
+}
+
+static int max2175_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct max2175_ctx *ctx = max2175_ctx_from_ctrl(ctrl->handler);
+	int ret = 0;
+
+	mxm_dbg(ctx, "s_ctrl: id 0x%x, val %u\n", ctrl->id, ctrl->val);
+	switch (ctrl->id) {
+	case V4L2_CID_MAX2175_I2S_EN:
+		max2175_i2s_enable(ctx, ctrl->val == 1);
+		break;
+	case V4L2_CID_MAX2175_I2S_MODE:
+		max2175_s_ctrl_i2s_mode(ctx, ctrl->val);
+		break;
+	case V4L2_CID_MAX2175_AM_HIZ:
+		v4l2_ctrl_activate(ctx->am_hiz, false);
+		break;
+	case V4L2_CID_MAX2175_HSLS:
+		v4l2_ctrl_activate(ctx->hsls, false);
+		break;
+	case V4L2_CID_MAX2175_RX_MODE:
+		mxm_dbg(ctx, "rx mode %u\n", ctrl->val);
+		max2175_s_ctrl_rx_mode(ctx, ctrl->val);
+		break;
+	default:
+		v4l2_err(ctx->client, "s:invalid ctrl id 0x%x\n", ctrl->id);
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int max2175_get_lna_gain(struct max2175_ctx *ctx)
+{
+	int gain = 0;
+	enum max2175_band band = max2175_get_bits(ctx, 5, 1, 0);
+
+	switch (band) {
+	case MAX2175_BAND_AM:
+		gain = max2175_read_bits(ctx, 51, 3, 1);
+		break;
+	case MAX2175_BAND_FM:
+		gain = max2175_read_bits(ctx, 50, 3, 1);
+		break;
+	case MAX2175_BAND_VHF:
+		gain = max2175_read_bits(ctx, 52, 3, 0);
+		break;
+	default:
+		v4l2_err(ctx->client, "invalid band %d to get rf gain\n", band);
+		break;
+	}
+	return gain;
+}
+
+static int max2175_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct max2175_ctx *ctx = max2175_ctx_from_ctrl(ctrl->handler);
+
+	/* Only the dynamically changing values need to be in g_volatile_ctrl */
+	mxm_dbg(ctx, "g_volatile_ctrl: id 0x%x\n", ctrl->id);
+	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;
+	default:
+		v4l2_err(ctx->client, "g:invalid ctrl id 0x%x\n", ctrl->id);
+		return -EINVAL;
+	}
+	mxm_dbg(ctx, "g_volatile_ctrl: id 0x%x val %d\n", ctrl->id, ctrl->val);
+	return 0;
+};
+
+static int max2175_set_freq_and_mode(struct max2175_ctx *ctx, u32 freq)
+{
+	u32 rx_mode;
+	int ret;
+
+	/* Get band from frequency */
+	ret = max2175_mode_from_freq(ctx, freq, &rx_mode);
+	if (ret) {
+		v4l2_err(ctx->client, "set freq mode failed: freq %u ret %d\n",
+			 freq, ret);
+		return ret;
+	}
+	mxm_dbg(ctx, "set_freq_and_mode: freq %u rx_mode %d\n", freq, rx_mode);
+
+	/* Load mode */
+	ret = max2175_set_rx_mode(ctx, rx_mode, ctx->am_hiz->val,
+				  ctx->hsls->val);
+	if (ret)
+		return ret;
+
+	/* Get current i2s_mode and update if needed for given rx_mode */
+	if (max2175_is_i2s_rx_mode_valid(ctx, rx_mode, ctx->i2s_mode->val))
+		max2175_update_i2s_mode(ctx, ctx->i2s_mode->val);
+	else
+		v4l2_ctrl_s_ctrl(ctx->i2s_mode,
+				 max2175_read_bits(ctx, 29, 2, 0));
+
+	/* Tune to the new freq given */
+	return max2175_tune_rf_freq(ctx, freq, ctx->hsls->val);
+}
+
+static int max2175_s_frequency(struct v4l2_subdev *sd,
+			       const struct v4l2_frequency *vf)
+{
+	struct max2175_ctx *ctx = max2175_ctx_from_sd(sd);
+	u32 freq;
+	int ret = 0;
+
+	mxm_dbg(ctx, "s_freq: tuner %u type %u freq: new %u, curr %u\n",
+		vf->tuner, vf->type, vf->frequency, ctx->freq);
+
+	if (vf->tuner != 0) {
+		v4l2_err(ctx->client, "s_freq: invalid tuner %u\n", vf->tuner);
+		return -EINVAL;
+	}
+	/* RF freq */
+	freq = clamp(vf->frequency, bands_rf.rangelow, bands_rf.rangehigh);
+	if (ctx->mode_resolved)
+		/* Check new freq valid for mode */
+		if (max2175_is_freq_rx_mode_valid(ctx, ctx->mode, freq))
+			ret = max2175_tune_rf_freq(ctx, freq, ctx->hsls->val);
+		else
+			/* Find default mode for freq and tune to it */
+			ret = max2175_set_freq_and_mode(ctx, freq);
+	else
+		ret = max2175_set_freq_and_mode(ctx, freq);
+
+	mxm_dbg(ctx, "s_freq: ret %d mode %d freq: curr %u\n",
+		ret, ctx->mode, ctx->freq);
+	return ret;
+}
+
+static int max2175_g_frequency(struct v4l2_subdev *sd,
+			       struct v4l2_frequency *vf)
+{
+	struct max2175_ctx *ctx = max2175_ctx_from_sd(sd);
+	int ret = 0;
+
+	if (vf->tuner != 0) {
+		v4l2_err(ctx->client, "g_freq: invalid tuner %u\n", vf->tuner);
+		return -EINVAL;
+	}
+
+	/* RF freq */
+	vf->type = V4L2_TUNER_RF;
+	vf->frequency = ctx->freq;
+	mxm_dbg(ctx, "g_freq: ret %d tuner %u, type %u, vf %u\n",
+		ret, vf->tuner, vf->type, vf->frequency);
+
+	return ret;
+}
+
+static int max2175_enum_freq_bands(struct v4l2_subdev *sd,
+			    struct v4l2_frequency_band *band)
+{
+	struct max2175_ctx *ctx = max2175_ctx_from_sd(sd);
+	int ret = 0;
+
+	if (band->tuner == 0 && band->index == 0)
+		*band = bands_rf;
+	else
+		ret = -EINVAL;
+
+	mxm_dbg(ctx,
+		"enum_freq: ret %d tuner %u type %u index %u low %u high %u\n",
+		ret, band->tuner, band->type, band->index, band->rangelow,
+		band->rangehigh);
+	return ret;
+}
+
+static int max2175_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
+{
+	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 = bands_rf.rangelow;
+	vt->rangehigh = 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,
+};
+
+static const struct v4l2_ctrl_config max2175_i2s_en = {
+	.ops = &max2175_ctrl_ops,
+	.id = V4L2_CID_MAX2175_I2S_EN,
+	.name = "I2S Enable",
+	.type = V4L2_CTRL_TYPE_BOOLEAN,
+	.min = 0,
+	.max = 1,
+	.step = 1,
+	.def = 1,
+};
+
+static const struct v4l2_ctrl_config max2175_i2s_mode = {
+	.ops = &max2175_ctrl_ops,
+	.id = V4L2_CID_MAX2175_I2S_MODE,
+	.name = "I2S_MODE value",
+	.type = V4L2_CTRL_TYPE_INTEGER,
+	.min = 0,
+	.max = 4,
+	.step = 1,
+	.def = 0,
+};
+
+static const struct v4l2_ctrl_config max2175_am_hiz = {
+	.ops = &max2175_ctrl_ops,
+	.id = V4L2_CID_MAX2175_AM_HIZ,
+	.name = "AM High impedance input",
+	.type = V4L2_CTRL_TYPE_BOOLEAN,
+	.min = 0,
+	.max = 1,
+	.step = 1,
+	.def = 0,
+};
+
+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_INTEGER,
+	.min = 0,
+	.max = 1,
+	.step = 1,
+	.def = 1,
+};
+
+
+/* NOTE: Any addition/deletion in the below list should be reflected in
+ * max2175_modetag enum
+ */
+static const char * const max2175_ctrl_eu_rx_mode_strings[] = {
+	"DAB 1.2",
+	"NULL",
+};
+
+static const char * const max2175_ctrl_na_rx_mode_strings[] = {
+	"NA FM 1.0",
+	"NULL",
+};
+
+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_mode_strings) - 2,
+	.def = 0,
+	.qmenu = max2175_ctrl_eu_rx_mode_strings,
+};
+
+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_mode_strings) - 2,
+	.def = 0,
+	.qmenu = max2175_ctrl_na_rx_mode_strings,
+};
+
+static u32 max2175_refout_load_to_bits(struct i2c_client *client, u32 load)
+{
+	u32 bits = 0;	/* REFOUT disabled */
+
+	if (load >= 0 && load <= 40)
+		bits = load / 10;
+	else if (load >= 60 && load <= 70)
+		bits = load / 10 - 1;
+	else
+		dev_warn(&client->dev, "invalid refout_load %u\n", load);
+
+	return bits;
+}
+
+static int max2175_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct max2175_ctx *ctx;
+	struct device *dev = &client->dev;
+	struct v4l2_subdev *sd;
+	struct v4l2_ctrl_handler *hdl;
+	struct clk *clk;
+	bool master = true;
+	u32 refout_load, refout_bits = 0;	/* REFOUT disabled */
+	int ret;
+
+	/* Check if the adapter supports the needed features */
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_BYTE_DATA)) {
+		dev_err(&client->dev, "i2c check failed\n");
+		return -EIO;
+	}
+
+	if (of_find_property(client->dev.of_node, "maxim,slave", NULL))
+		master = false;
+
+	if (!of_property_read_u32(client->dev.of_node, "maxim,refout-load",
+				 &refout_load))
+		refout_bits = max2175_refout_load_to_bits(client, refout_load);
+
+	clk = devm_clk_get(&client->dev, "xtal");
+	if (IS_ERR(clk)) {
+		ret = PTR_ERR(clk);
+		dev_err(&client->dev, "cannot get xtal clock %d\n", ret);
+		return -ENODEV;
+	}
+
+	ctx = kzalloc(sizeof(struct max2175_ctx),
+			     GFP_KERNEL);
+	if (ctx == NULL)
+		return -ENOMEM;
+
+	sd = &ctx->sd;
+	ctx->master = master;
+	ctx->mode_resolved = false;
+
+	/* Set the defaults */
+	ctx->freq = bands_rf.rangelow;
+
+	ctx->xtal_freq = clk_get_rate(clk);
+	dev_info(&client->dev, "xtal freq %lluHz\n", ctx->xtal_freq);
+
+	v4l2_i2c_subdev_init(sd, client, &max2175_ops);
+	ctx->client = client;
+
+	sd->flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
+	ctx->dev = dev;
+
+	/* Controls */
+	hdl = &ctx->ctrl_hdl;
+	ret = v4l2_ctrl_handler_init(hdl, 8);
+	if (ret) {
+		dev_err(&client->dev, "ctrl handler init failed\n");
+		goto err;
+	}
+
+	ctx->lna_gain = v4l2_ctrl_new_std(hdl, &max2175_ctrl_ops,
+					  V4L2_CID_RF_TUNER_LNA_GAIN,
+					  0, 15, 1, 2);
+	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->i2s_mode = v4l2_ctrl_new_custom(hdl, &max2175_i2s_mode, NULL);
+	ctx->am_hiz = v4l2_ctrl_new_custom(hdl, &max2175_am_hiz, 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 = (struct max2175_rxmode *)eu_rx_modes;
+	} else {
+		ctx->rx_mode = v4l2_ctrl_new_custom(hdl,
+						    &max2175_na_rx_mode, NULL);
+		ctx->rx_modes = (struct max2175_rxmode *)na_rx_modes;
+	}
+	ctx->sd.ctrl_handler = &ctx->ctrl_hdl;
+
+	ret = v4l2_async_register_subdev(sd);
+	if (ret) {
+		dev_err(&client->dev, "register subdev failed\n");
+		goto err_reg;
+	}
+	dev_info(&client->dev, "subdev registered\n");
+
+	/* Initialize device */
+	ret = max2175_core_init(ctx, refout_bits);
+	if (ret)
+		goto err_init;
+
+	mxm_dbg(ctx, "probed\n");
+	return 0;
+
+err_init:
+	v4l2_async_unregister_subdev(sd);
+err_reg:
+	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);
+err:
+	kfree(ctx);
+	return ret;
+}
+
+static int max2175_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct max2175_ctx *ctx = max2175_ctx_from_sd(sd);
+
+	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);
+	v4l2_async_unregister_subdev(sd);
+	mxm_dbg(ctx, "removed\n");
+	kfree(ctx);
+	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>");
diff --git a/drivers/media/i2c/max2175/max2175.h b/drivers/media/i2c/max2175/max2175.h
new file mode 100644
index 0000000..61a508b
--- /dev/null
+++ b/drivers/media/i2c/max2175/max2175.h
@@ -0,0 +1,124 @@
+/*
+ * 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 chip.
+ *
+ * Copyright (C) 2016 Maxim Integrated Products
+ * Copyright (C) 2016 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.
+ */
+
+#ifndef __MAX2175_H__
+#define __MAX2175_H__
+
+#include <linux/types.h>
+
+enum max2175_region {
+	MAX2175_REGION_EU = 0,	/* Europe */
+	MAX2175_REGION_NA,	/* North America */
+};
+
+#define MAX2175_EU_XTAL_FREQ	(36864000)	/* In Hz */
+#define MAX2175_NA_XTAL_FREQ	(40186125)	/* In Hz */
+
+enum max2175_band {
+	MAX2175_BAND_AM = 0,
+	MAX2175_BAND_FM,
+	MAX2175_BAND_VHF,
+	MAX2175_BAND_L,
+};
+
+/* NOTE: Any addition/deletion in the below enum should be reflected in
+ * V4L2_CID_MAX2175_RX_MODE ctrl strings
+ */
+enum max2175_modetag {
+	/* EU modes */
+	MAX2175_DAB_1_2 = 0,
+
+	/* Other possible modes to add in future
+	 * MAX2175_DAB_1_0,
+	 * MAX2175_DAB_1_3,
+	 * MAX2175_EU_FM_2_2,
+	 * MAX2175_EU_FM_1_0,
+	 * MAX2175_EU_FMHD_4_0,
+	 * MAX2175_EU_AM_1_0,
+	 * MAX2175_EU_AM_2_2,
+	 */
+
+	/* NA modes */
+	MAX2175_NA_FM_1_0 = 0,
+
+	/* Other possible modes to add in future
+	 * MAX2175_NA_FM_1_2,
+	 * MAX2175_NA_FMHD_1_0,
+	 * MAX2175_NA_FMHD_1_2,
+	 * MAX2175_NA_AM_1_0,
+	 * MAX2175_NA_AM_1_2,
+	 */
+};
+
+/* Supported I2S modes */
+enum {
+	MAX2175_I2S_MODE0 = 0,
+	MAX2175_I2S_MODE1,
+	MAX2175_I2S_MODE2,
+	MAX2175_I2S_MODE3,
+	MAX2175_I2S_MODE4,
+};
+
+/* Coefficient table groups */
+enum {
+	MAX2175_CH_MSEL = 0,
+	MAX2175_EQ_MSEL,
+	MAX2175_AA_MSEL,
+};
+
+/* HSLS LO injection polarity */
+enum {
+	MAX2175_LO_BELOW_DESIRED = 0,
+	MAX2175_LO_ABOVE_DESIRED,
+};
+
+/* Channel FSM modes */
+enum max2175_csm_mode {
+	MAX2175_CSM_MODE_LOAD_TO_BUFFER = 0,
+	MAX2175_CSM_MODE_PRESET_TUNE,
+	MAX2175_CSM_MODE_SEARCH,
+	MAX2175_CSM_MODE_AF_UPDATE,
+	MAX2175_CSM_MODE_JUMP_FAST_TUNE,
+	MAX2175_CSM_MODE_CHECK,
+	MAX2175_CSM_MODE_LOAD_AND_SWAP,
+	MAX2175_CSM_MODE_END,
+	MAX2175_CSM_MODE_BUFFER_PLUS_PRESET_TUNE,
+	MAX2175_CSM_MODE_BUFFER_PLUS_SEARCH,
+	MAX2175_CSM_MODE_BUFFER_PLUS_AF_UPDATE,
+	MAX2175_CSM_MODE_BUFFER_PLUS_JUMP_FAST_TUNE,
+	MAX2175_CSM_MODE_BUFFER_PLUS_CHECK,
+	MAX2175_CSM_MODE_BUFFER_PLUS_LOAD_AND_SWAP,
+	MAX2175_CSM_MODE_NO_ACTION
+};
+
+/* Rx mode */
+struct max2175_rxmode {
+	enum max2175_band band;		/* Associated band */
+	u32 freq;			/* Default freq in Hz */
+	u8 i2s_word_size;		/* Bit value */
+	u8 i2s_modes[4];		/* Supported modes */
+};
+
+/* Register map */
+struct max2175_regmap {
+	u8 idx;				/* Register index */
+	u8 val;				/* Register value */
+};
+
+#endif /* __MAX2175_H__ */
-- 
1.9.1