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.shanmugasunda...@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 BitsĀ® 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.shanmugasunda...@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

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