From ca6aba3a4bf358b763d0e508df95455de3ae992c Mon Sep 17 00:00:00 2001
From: Zefa Chen <zefa.chen@rock-chips.com>
Date: Fri, 17 May 2019 18:23:03 +0800
Subject: [PATCH] media: i2c: add ov9281 driver.

Change-Id: I7b77250bbc56d2f861450cf77271ad15f9b88ab1
Signed-off-by: Zefa Chen <zefa.chen@rock-chips.com>
---
 drivers/media/i2c/Kconfig  |   11 +
 drivers/media/i2c/Makefile |    1 +
 drivers/media/i2c/ov9281.c | 1171 ++++++++++++++++++++++++++++++++++++
 3 files changed, 1183 insertions(+)
 create mode 100644 drivers/media/i2c/ov9281.c

--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -855,6 +855,17 @@ config VIDEO_OV9640
 	  This is a Video4Linux2 sensor driver for the OmniVision
 	  OV9640 camera sensor.
 
+config VIDEO_OV9281
+	tristate "OmniVision OV9281 sensor support"
+	depends on I2C && VIDEO_V4L2
+	depends on MEDIA_CAMERA_SUPPORT
+	help
+	  This is a Video4Linux2 sensor-level driver for the OmniVision
+	  OV9281 camera.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ov9281.
+
 config VIDEO_OV9650
 	tristate "OmniVision OV9650/OV9652 sensor support"
 	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -79,6 +79,7 @@ obj-$(CONFIG_VIDEO_OV7670) += ov7670.o
 obj-$(CONFIG_VIDEO_OV772X) += ov772x.o
 obj-$(CONFIG_VIDEO_OV7740) += ov7740.o
 obj-$(CONFIG_VIDEO_OV8856) += ov8856.o
+obj-$(CONFIG_VIDEO_OV9281) += ov9281.o
 obj-$(CONFIG_VIDEO_OV9640) += ov9640.o
 obj-$(CONFIG_VIDEO_OV9650) += ov9650.o
 obj-$(CONFIG_VIDEO_OV13858) += ov13858.o
--- /dev/null
+++ b/drivers/media/i2c/ov9281.c
@@ -0,0 +1,1171 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ov9281 driver
+ *
+ * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd.
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/sysfs.h>
+#include <linux/slab.h>
+#include <linux/rk-camera-module.h>
+#include <media/media-entity.h>
+#include <media/v4l2-async.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-subdev.h>
+#include <linux/pinctrl/consumer.h>
+
+#define DRIVER_VERSION			KERNEL_VERSION(0, 0x01, 0x0)
+
+#ifndef V4L2_CID_DIGITAL_GAIN
+#define V4L2_CID_DIGITAL_GAIN		V4L2_CID_GAIN
+#endif
+
+#define OV9281_LINK_FREQ_400MHZ		400000000
+/* pixel rate = link frequency * 2 * lanes / BITS_PER_SAMPLE */
+#define OV9281_PIXEL_RATE		(OV9281_LINK_FREQ_400MHZ * 2 * 2 / 10)
+#define OV9281_XVCLK_FREQ		24000000
+
+#define CHIP_ID				0x9281
+#define OV9281_REG_CHIP_ID		0x300a
+
+#define OV9281_REG_CTRL_MODE		0x0100
+#define OV9281_MODE_SW_STANDBY		0x0
+#define OV9281_MODE_STREAMING		BIT(0)
+
+#define OV9281_REG_EXPOSURE		0x3500
+#define	OV9281_EXPOSURE_MIN		4
+#define	OV9281_EXPOSURE_STEP		1
+#define OV9281_VTS_MAX			0x7fff
+
+#define OV9281_REG_GAIN_H		0x3508
+#define OV9281_REG_GAIN_L		0x3509
+#define OV9281_GAIN_H_MASK		0x07
+#define OV9281_GAIN_H_SHIFT		8
+#define OV9281_GAIN_L_MASK		0xff
+#define OV9281_GAIN_MIN			0x10
+#define OV9281_GAIN_MAX			0xf8
+#define OV9281_GAIN_STEP		1
+#define OV9281_GAIN_DEFAULT		0x10
+
+#define OV9281_REG_TEST_PATTERN		0x5e00
+#define OV9281_TEST_PATTERN_ENABLE	0x80
+#define OV9281_TEST_PATTERN_DISABLE	0x0
+
+#define OV9281_REG_VTS			0x380e
+
+#define REG_NULL			0xFFFF
+
+#define OV9281_REG_VALUE_08BIT		1
+#define OV9281_REG_VALUE_16BIT		2
+#define OV9281_REG_VALUE_24BIT		3
+
+#define OV9281_LANES			2
+#define OV9281_BITS_PER_SAMPLE		10
+
+#define OF_CAMERA_PINCTRL_STATE_DEFAULT	"rockchip,camera_default"
+#define OF_CAMERA_PINCTRL_STATE_SLEEP	"rockchip,camera_sleep"
+
+#define OV9281_NAME			"ov9281"
+
+static const char * const ov9281_supply_names[] = {
+	"avdd",		/* Analog power */
+	"dovdd",	/* Digital I/O power */
+	"dvdd",		/* Digital core power */
+};
+
+#define OV9281_NUM_SUPPLIES ARRAY_SIZE(ov9281_supply_names)
+
+struct regval {
+	u16 addr;
+	u8 val;
+};
+
+struct ov9281_mode {
+	u32 width;
+	u32 height;
+	u32 max_fps;
+	u32 hts_def;
+	u32 vts_def;
+	u32 exp_def;
+	const struct regval *reg_list;
+};
+
+struct ov9281 {
+	struct i2c_client	*client;
+	struct clk		*xvclk;
+	struct gpio_desc	*reset_gpio;
+	struct gpio_desc	*pwdn_gpio;
+	struct regulator_bulk_data supplies[OV9281_NUM_SUPPLIES];
+
+	struct pinctrl		*pinctrl;
+	struct pinctrl_state	*pins_default;
+	struct pinctrl_state	*pins_sleep;
+
+	struct v4l2_subdev	subdev;
+	struct media_pad	pad;
+	struct v4l2_ctrl_handler ctrl_handler;
+	struct v4l2_ctrl	*exposure;
+	struct v4l2_ctrl	*anal_gain;
+	struct v4l2_ctrl	*digi_gain;
+	struct v4l2_ctrl	*hblank;
+	struct v4l2_ctrl	*vblank;
+	struct v4l2_ctrl	*test_pattern;
+	struct mutex		mutex;
+	bool			streaming;
+	bool			power_on;
+	const struct ov9281_mode *cur_mode;
+	u32			module_index;
+	const char		*module_facing;
+	const char		*module_name;
+	const char		*len_name;
+};
+
+#define to_ov9281(sd) container_of(sd, struct ov9281, subdev)
+
+/*
+ * Xclk 24Mhz
+ */
+static const struct regval ov9281_global_regs[] = {
+	{REG_NULL, 0x00},
+};
+
+/*
+ * Xclk 24Mhz
+ * max_framerate 120fps
+ * mipi_datarate per lane 800Mbps
+ */
+static const struct regval ov9281_1280x800_regs[] = {
+	{0x0103, 0x01},
+	{0x0302, 0x32},
+	{0x030d, 0x50},
+	{0x030e, 0x02},
+	{0x3001, 0x00},
+	{0x3004, 0x00},
+	{0x3005, 0x00},
+	{0x3006, 0x04},
+	{0x3011, 0x0a},
+	{0x3013, 0x18},
+	{0x3022, 0x01},
+	{0x3023, 0x00},
+	{0x302c, 0x00},
+	{0x302f, 0x00},
+	{0x3030, 0x04},
+	{0x3039, 0x32},
+	{0x303a, 0x00},
+	{0x303f, 0x01},
+	{0x3500, 0x00},
+	{0x3501, 0x2a},
+	{0x3502, 0x90},
+	{0x3503, 0x08},
+	{0x3505, 0x8c},
+	{0x3507, 0x03},
+	{0x3508, 0x00},
+	{0x3509, 0x10},
+	{0x3610, 0x80},
+	{0x3611, 0xa0},
+	{0x3620, 0x6f},
+	{0x3632, 0x56},
+	{0x3633, 0x78},
+	{0x3662, 0x05},
+	{0x3666, 0x00},
+	{0x366f, 0x5a},
+	{0x3680, 0x84},
+	{0x3712, 0x80},
+	{0x372d, 0x22},
+	{0x3731, 0x80},
+	{0x3732, 0x30},
+	{0x3778, 0x00},
+	{0x377d, 0x22},
+	{0x3788, 0x02},
+	{0x3789, 0xa4},
+	{0x378a, 0x00},
+	{0x378b, 0x4a},
+	{0x3799, 0x20},
+	{0x3800, 0x00},
+	{0x3801, 0x00},
+	{0x3802, 0x00},
+	{0x3803, 0x00},
+	{0x3804, 0x05},
+	{0x3805, 0x0f},
+	{0x3806, 0x03},
+	{0x3807, 0x2f},
+	{0x3808, 0x05},
+	{0x3809, 0x00},
+	{0x380a, 0x03},
+	{0x380b, 0x20},
+	{0x380c, 0x02},
+	{0x380d, 0xd8},
+	{0x380e, 0x03},
+	{0x380f, 0x8e},
+	{0x3810, 0x00},
+	{0x3811, 0x08},
+	{0x3812, 0x00},
+	{0x3813, 0x08},
+	{0x3814, 0x11},
+	{0x3815, 0x11},
+	{0x3820, 0x40},
+	{0x3821, 0x00},
+	{0x3881, 0x42},
+	{0x38b1, 0x00},
+	{0x3920, 0xff},
+	{0x4003, 0x40},
+	{0x4008, 0x04},
+	{0x4009, 0x0b},
+	{0x400c, 0x00},
+	{0x400d, 0x07},
+	{0x4010, 0x40},
+	{0x4043, 0x40},
+	{0x4307, 0x30},
+	{0x4317, 0x00},
+	{0x4501, 0x00},
+	{0x4507, 0x00},
+	{0x4509, 0x00},
+	{0x450a, 0x08},
+	{0x4601, 0x04},
+	{0x470f, 0x00},
+	{0x4f07, 0x00},
+	{0x4800, 0x00},
+	{0x5000, 0x9f},
+	{0x5001, 0x00},
+	{0x5e00, 0x00},
+	{0x5d00, 0x07},
+	{0x5d01, 0x00},
+	{REG_NULL, 0x00},
+};
+
+static const struct ov9281_mode supported_modes[] = {
+	{
+		.width = 1280,
+		.height = 800,
+		.max_fps = 120,
+		.exp_def = 0x0320,
+		.hts_def = 0x0b60,//0x2d8*4
+		.vts_def = 0x038e,
+		.reg_list = ov9281_1280x800_regs,
+	},
+};
+
+static const s64 link_freq_menu_items[] = {
+	OV9281_LINK_FREQ_400MHZ
+};
+
+static const char * const ov9281_test_pattern_menu[] = {
+	"Disabled",
+	"Vertical Color Bar Type 1",
+	"Vertical Color Bar Type 2",
+	"Vertical Color Bar Type 3",
+	"Vertical Color Bar Type 4"
+};
+
+/* Write registers up to 4 at a time */
+static int ov9281_write_reg(struct i2c_client *client, u16 reg,
+			    u32 len, u32 val)
+{
+	u32 buf_i, val_i;
+	u8 buf[6];
+	u8 *val_p;
+	__be32 val_be;
+
+	if (len > 4)
+		return -EINVAL;
+
+	buf[0] = reg >> 8;
+	buf[1] = reg & 0xff;
+
+	val_be = cpu_to_be32(val);
+	val_p = (u8 *)&val_be;
+	buf_i = 2;
+	val_i = 4 - len;
+
+	while (val_i < 4)
+		buf[buf_i++] = val_p[val_i++];
+
+	if (i2c_master_send(client, buf, len + 2) != len + 2)
+		return -EIO;
+
+	return 0;
+}
+
+static int ov9281_write_array(struct i2c_client *client,
+			      const struct regval *regs)
+{
+	u32 i;
+	int ret = 0;
+
+	for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++)
+		ret = ov9281_write_reg(client, regs[i].addr,
+				       OV9281_REG_VALUE_08BIT, regs[i].val);
+
+	return ret;
+}
+
+/* Read registers up to 4 at a time */
+static int ov9281_read_reg(struct i2c_client *client, u16 reg, unsigned int len,
+			   u32 *val)
+{
+	struct i2c_msg msgs[2];
+	u8 *data_be_p;
+	__be32 data_be = 0;
+	__be16 reg_addr_be = cpu_to_be16(reg);
+	int ret;
+
+	if (len > 4 || !len)
+		return -EINVAL;
+
+	data_be_p = (u8 *)&data_be;
+	/* Write register address */
+	msgs[0].addr = client->addr;
+	msgs[0].flags = 0;
+	msgs[0].len = 2;
+	msgs[0].buf = (u8 *)&reg_addr_be;
+
+	/* Read data from register */
+	msgs[1].addr = client->addr;
+	msgs[1].flags = I2C_M_RD;
+	msgs[1].len = len;
+	msgs[1].buf = &data_be_p[4 - len];
+
+	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+	if (ret != ARRAY_SIZE(msgs))
+		return -EIO;
+
+	*val = be32_to_cpu(data_be);
+
+	return 0;
+}
+
+static int ov9281_get_reso_dist(const struct ov9281_mode *mode,
+				struct v4l2_mbus_framefmt *framefmt)
+{
+	return abs(mode->width - framefmt->width) +
+	       abs(mode->height - framefmt->height);
+}
+
+static const struct ov9281_mode *
+ov9281_find_best_fit(struct v4l2_subdev_format *fmt)
+{
+	struct v4l2_mbus_framefmt *framefmt = &fmt->format;
+	int dist;
+	int cur_best_fit = 0;
+	int cur_best_fit_dist = -1;
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(supported_modes); i++) {
+		dist = ov9281_get_reso_dist(&supported_modes[i], framefmt);
+		if (cur_best_fit_dist == -1 || dist < cur_best_fit_dist) {
+			cur_best_fit_dist = dist;
+			cur_best_fit = i;
+		}
+	}
+
+	return &supported_modes[cur_best_fit];
+}
+
+static int ov9281_set_fmt(struct v4l2_subdev *sd,
+			  struct v4l2_subdev_pad_config *cfg,
+			  struct v4l2_subdev_format *fmt)
+{
+	struct ov9281 *ov9281 = to_ov9281(sd);
+	const struct ov9281_mode *mode;
+	s64 h_blank, vblank_def;
+
+	mutex_lock(&ov9281->mutex);
+
+	mode = ov9281_find_best_fit(fmt);
+	fmt->format.code = MEDIA_BUS_FMT_Y10_1X10;
+	fmt->format.width = mode->width;
+	fmt->format.height = mode->height;
+	fmt->format.field = V4L2_FIELD_NONE;
+	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+		*v4l2_subdev_get_try_format(sd, cfg, fmt->pad) = fmt->format;
+#else
+		mutex_unlock(&ov9281->mutex);
+		return -ENOTTY;
+#endif
+	} else {
+		ov9281->cur_mode = mode;
+		h_blank = mode->hts_def - mode->width;
+		__v4l2_ctrl_modify_range(ov9281->hblank, h_blank,
+					 h_blank, 1, h_blank);
+		vblank_def = mode->vts_def - mode->height;
+		__v4l2_ctrl_modify_range(ov9281->vblank, vblank_def,
+					 OV9281_VTS_MAX - mode->height,
+					 1, vblank_def);
+	}
+
+	mutex_unlock(&ov9281->mutex);
+
+	return 0;
+}
+
+static int ov9281_get_fmt(struct v4l2_subdev *sd,
+			  struct v4l2_subdev_pad_config *cfg,
+			  struct v4l2_subdev_format *fmt)
+{
+	struct ov9281 *ov9281 = to_ov9281(sd);
+	const struct ov9281_mode *mode = ov9281->cur_mode;
+
+	mutex_lock(&ov9281->mutex);
+	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+		fmt->format = *v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
+#else
+		mutex_unlock(&ov9281->mutex);
+		return -ENOTTY;
+#endif
+	} else {
+		fmt->format.width = mode->width;
+		fmt->format.height = mode->height;
+		fmt->format.code = MEDIA_BUS_FMT_Y10_1X10;
+		fmt->format.field = V4L2_FIELD_NONE;
+	}
+	mutex_unlock(&ov9281->mutex);
+
+	return 0;
+}
+
+static int ov9281_enum_mbus_code(struct v4l2_subdev *sd,
+				 struct v4l2_subdev_pad_config *cfg,
+				 struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->index != 0)
+		return -EINVAL;
+	code->code = MEDIA_BUS_FMT_Y10_1X10;
+
+	return 0;
+}
+
+static int ov9281_enum_frame_sizes(struct v4l2_subdev *sd,
+				   struct v4l2_subdev_pad_config *cfg,
+				   struct v4l2_subdev_frame_size_enum *fse)
+{
+	if (fse->index >= ARRAY_SIZE(supported_modes))
+		return -EINVAL;
+
+	if (fse->code != MEDIA_BUS_FMT_Y10_1X10)
+		return -EINVAL;
+
+	fse->min_width  = supported_modes[fse->index].width;
+	fse->max_width  = supported_modes[fse->index].width;
+	fse->max_height = supported_modes[fse->index].height;
+	fse->min_height = supported_modes[fse->index].height;
+
+	return 0;
+}
+
+static int ov9281_enable_test_pattern(struct ov9281 *ov9281, u32 pattern)
+{
+	u32 val;
+
+	if (pattern)
+		val = (pattern - 1) | OV9281_TEST_PATTERN_ENABLE;
+	else
+		val = OV9281_TEST_PATTERN_DISABLE;
+
+	return ov9281_write_reg(ov9281->client, OV9281_REG_TEST_PATTERN,
+				OV9281_REG_VALUE_08BIT, val);
+}
+
+static int OV9281_g_frame_interval(struct v4l2_subdev *sd,
+				   struct v4l2_subdev_frame_interval *fi)
+{
+	struct ov9281 *ov9281 = to_ov9281(sd);
+	const struct ov9281_mode *mode = ov9281->cur_mode;
+
+	mutex_lock(&ov9281->mutex);
+	fi->interval.numerator = 10000;
+	fi->interval.denominator = mode->max_fps * 10000;
+	mutex_unlock(&ov9281->mutex);
+
+	return 0;
+}
+
+static void ov9281_get_module_inf(struct ov9281 *ov9281,
+				  struct rkmodule_inf *inf)
+{
+	memset(inf, 0, sizeof(*inf));
+	strlcpy(inf->base.sensor, OV9281_NAME, sizeof(inf->base.sensor));
+	strlcpy(inf->base.module, ov9281->module_name,
+		sizeof(inf->base.module));
+	strlcpy(inf->base.lens, ov9281->len_name, sizeof(inf->base.lens));
+}
+
+static long ov9281_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
+{
+	struct ov9281 *ov9281 = to_ov9281(sd);
+	long ret = 0;
+
+	switch (cmd) {
+	case RKMODULE_GET_MODULE_INFO:
+		ov9281_get_module_inf(ov9281, (struct rkmodule_inf *)arg);
+		break;
+	default:
+		ret = -ENOIOCTLCMD;
+		break;
+	}
+
+	return ret;
+}
+
+#ifdef CONFIG_COMPAT
+static long ov9281_compat_ioctl32(struct v4l2_subdev *sd,
+				  unsigned int cmd, unsigned long arg)
+{
+	void __user *up = compat_ptr(arg);
+	struct rkmodule_inf *inf;
+	struct rkmodule_awb_cfg *cfg;
+	long ret;
+
+	switch (cmd) {
+	case RKMODULE_GET_MODULE_INFO:
+		inf = kzalloc(sizeof(*inf), GFP_KERNEL);
+		if (!inf) {
+			ret = -ENOMEM;
+			return ret;
+		}
+
+		ret = ov9281_ioctl(sd, cmd, inf);
+		if (!ret)
+			ret = copy_to_user(up, inf, sizeof(*inf));
+		kfree(inf);
+		break;
+	case RKMODULE_AWB_CFG:
+		cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
+		if (!cfg) {
+			ret = -ENOMEM;
+			return ret;
+		}
+
+		ret = copy_from_user(cfg, up, sizeof(*cfg));
+		if (!ret)
+			ret = ov9281_ioctl(sd, cmd, cfg);
+		kfree(cfg);
+		break;
+	default:
+		ret = -ENOIOCTLCMD;
+		break;
+	}
+
+	return ret;
+}
+#endif
+
+static int __ov9281_start_stream(struct ov9281 *ov9281)
+{
+	int ret;
+
+	ret = ov9281_write_array(ov9281->client, ov9281->cur_mode->reg_list);
+	if (ret)
+		return ret;
+
+	/* In case these controls are set before streaming */
+	mutex_unlock(&ov9281->mutex);
+	ret = v4l2_ctrl_handler_setup(&ov9281->ctrl_handler);
+	mutex_lock(&ov9281->mutex);
+	if (ret)
+		return ret;
+
+	return ov9281_write_reg(ov9281->client, OV9281_REG_CTRL_MODE,
+				OV9281_REG_VALUE_08BIT, OV9281_MODE_STREAMING);
+}
+
+static int __ov9281_stop_stream(struct ov9281 *ov9281)
+{
+	return ov9281_write_reg(ov9281->client, OV9281_REG_CTRL_MODE,
+				OV9281_REG_VALUE_08BIT, OV9281_MODE_SW_STANDBY);
+}
+
+static int ov9281_s_stream(struct v4l2_subdev *sd, int on)
+{
+	struct ov9281 *ov9281 = to_ov9281(sd);
+	struct i2c_client *client = ov9281->client;
+	int ret = 0;
+
+	mutex_lock(&ov9281->mutex);
+	on = !!on;
+	if (on == ov9281->streaming)
+		goto unlock_and_return;
+
+	if (on) {
+		ret = pm_runtime_get_sync(&client->dev);
+		if (ret < 0) {
+			pm_runtime_put_noidle(&client->dev);
+			goto unlock_and_return;
+		}
+
+		ret = __ov9281_start_stream(ov9281);
+		if (ret) {
+			v4l2_err(sd, "start stream failed while write regs\n");
+			pm_runtime_put(&client->dev);
+			goto unlock_and_return;
+		}
+	} else {
+		__ov9281_stop_stream(ov9281);
+		pm_runtime_put(&client->dev);
+	}
+
+	ov9281->streaming = on;
+
+unlock_and_return:
+	mutex_unlock(&ov9281->mutex);
+
+	return ret;
+}
+
+static int ov9281_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct ov9281 *ov9281 = to_ov9281(sd);
+	struct i2c_client *client = ov9281->client;
+	int ret = 0;
+
+	mutex_lock(&ov9281->mutex);
+
+	/* If the power state is not modified - no work to do. */
+	if (ov9281->power_on == !!on)
+		goto unlock_and_return;
+
+	if (on) {
+		ret = pm_runtime_get_sync(&client->dev);
+		if (ret < 0) {
+			pm_runtime_put_noidle(&client->dev);
+			goto unlock_and_return;
+		}
+		ret = ov9281_write_array(ov9281->client, ov9281_global_regs);
+		if (ret) {
+			v4l2_err(sd, "could not set init registers\n");
+			pm_runtime_put_noidle(&client->dev);
+			goto unlock_and_return;
+		}
+		ov9281->power_on = true;
+	} else {
+		pm_runtime_put(&client->dev);
+		ov9281->power_on = false;
+	}
+
+unlock_and_return:
+	mutex_unlock(&ov9281->mutex);
+
+	return ret;
+}
+
+/* Calculate the delay in us by clock rate and clock cycles */
+static inline u32 ov9281_cal_delay(u32 cycles)
+{
+	return DIV_ROUND_UP(cycles, OV9281_XVCLK_FREQ / 1000 / 1000);
+}
+
+static int __ov9281_power_on(struct ov9281 *ov9281)
+{
+	int ret;
+	u32 delay_us;
+	struct device *dev = &ov9281->client->dev;
+
+	if (!IS_ERR_OR_NULL(ov9281->pins_default)) {
+		ret = pinctrl_select_state(ov9281->pinctrl,
+					   ov9281->pins_default);
+		if (ret < 0)
+			dev_err(dev, "could not set pins\n");
+	}
+
+	ret = clk_prepare_enable(ov9281->xvclk);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable xvclk\n");
+		return ret;
+	}
+
+	if (!IS_ERR(ov9281->reset_gpio))
+		gpiod_set_value_cansleep(ov9281->reset_gpio, 0);
+
+	ret = regulator_bulk_enable(OV9281_NUM_SUPPLIES, ov9281->supplies);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable regulators\n");
+		goto disable_clk;
+	}
+
+	if (!IS_ERR(ov9281->reset_gpio))
+		gpiod_set_value_cansleep(ov9281->reset_gpio, 1);
+
+	usleep_range(500, 1000);
+	if (!IS_ERR(ov9281->pwdn_gpio))
+		gpiod_set_value_cansleep(ov9281->pwdn_gpio, 1);
+
+	/* 8192 cycles prior to first SCCB transaction */
+	delay_us = ov9281_cal_delay(8192);
+	usleep_range(delay_us, delay_us * 2);
+
+	return 0;
+
+disable_clk:
+	clk_disable_unprepare(ov9281->xvclk);
+
+	return ret;
+}
+
+static void __ov9281_power_off(struct ov9281 *ov9281)
+{
+	int ret;
+	struct device *dev = &ov9281->client->dev;
+
+	if (!IS_ERR(ov9281->pwdn_gpio))
+		gpiod_set_value_cansleep(ov9281->pwdn_gpio, 0);
+	clk_disable_unprepare(ov9281->xvclk);
+	if (!IS_ERR(ov9281->reset_gpio))
+		gpiod_set_value_cansleep(ov9281->reset_gpio, 0);
+	if (!IS_ERR_OR_NULL(ov9281->pins_sleep)) {
+		ret = pinctrl_select_state(ov9281->pinctrl,
+					   ov9281->pins_sleep);
+		if (ret < 0)
+			dev_dbg(dev, "could not set pins\n");
+	}
+	regulator_bulk_disable(OV9281_NUM_SUPPLIES, ov9281->supplies);
+}
+
+static int ov9281_runtime_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov9281 *ov9281 = to_ov9281(sd);
+
+	return __ov9281_power_on(ov9281);
+}
+
+static int ov9281_runtime_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov9281 *ov9281 = to_ov9281(sd);
+
+	__ov9281_power_off(ov9281);
+
+	return 0;
+}
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+static int ov9281_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+	struct ov9281 *ov9281 = to_ov9281(sd);
+	struct v4l2_mbus_framefmt *try_fmt =
+				v4l2_subdev_get_try_format(sd, fh->pad, 0);
+	const struct ov9281_mode *def_mode = &supported_modes[0];
+
+	mutex_lock(&ov9281->mutex);
+	/* Initialize try_fmt */
+	try_fmt->width = def_mode->width;
+	try_fmt->height = def_mode->height;
+	try_fmt->code = MEDIA_BUS_FMT_Y10_1X10;
+	try_fmt->field = V4L2_FIELD_NONE;
+
+	mutex_unlock(&ov9281->mutex);
+	/* No crop or compose */
+
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops ov9281_pm_ops = {
+	SET_RUNTIME_PM_OPS(ov9281_runtime_suspend,
+			   ov9281_runtime_resume, NULL)
+};
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+static const struct v4l2_subdev_internal_ops ov9281_internal_ops = {
+	.open = ov9281_open,
+};
+#endif
+
+static const struct v4l2_subdev_core_ops ov9281_core_ops = {
+	.s_power = ov9281_s_power,
+	.ioctl = ov9281_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl32 = ov9281_compat_ioctl32,
+#endif
+};
+
+static const struct v4l2_subdev_video_ops ov9281_video_ops = {
+	.s_stream = ov9281_s_stream,
+	.g_frame_interval = OV9281_g_frame_interval,
+};
+
+static const struct v4l2_subdev_pad_ops ov9281_pad_ops = {
+	.enum_mbus_code = ov9281_enum_mbus_code,
+	.enum_frame_size = ov9281_enum_frame_sizes,
+	.get_fmt = ov9281_get_fmt,
+	.set_fmt = ov9281_set_fmt,
+};
+
+static const struct v4l2_subdev_ops ov9281_subdev_ops = {
+	.core	= &ov9281_core_ops,
+	.video	= &ov9281_video_ops,
+	.pad	= &ov9281_pad_ops,
+};
+
+static int ov9281_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct ov9281 *ov9281 = container_of(ctrl->handler,
+					     struct ov9281, ctrl_handler);
+	struct i2c_client *client = ov9281->client;
+	s64 max;
+	int ret = 0;
+
+	/* Propagate change of current control to all related controls */
+	switch (ctrl->id) {
+	case V4L2_CID_VBLANK:
+		/* Update max exposure while meeting expected vblanking */
+		max = ov9281->cur_mode->height + ctrl->val - 4;
+		__v4l2_ctrl_modify_range(ov9281->exposure,
+					 ov9281->exposure->minimum, max,
+					 ov9281->exposure->step,
+					 ov9281->exposure->default_value);
+		break;
+	}
+
+	if (pm_runtime_get(&client->dev) <= 0)
+		return 0;
+
+	switch (ctrl->id) {
+	case V4L2_CID_EXPOSURE:
+		/* 4 least significant bits of expsoure are fractional part */
+		ret = ov9281_write_reg(ov9281->client, OV9281_REG_EXPOSURE,
+				       OV9281_REG_VALUE_24BIT, ctrl->val << 4);
+		break;
+	case V4L2_CID_ANALOGUE_GAIN:
+		ret = ov9281_write_reg(ov9281->client, OV9281_REG_GAIN_H,
+				       OV9281_REG_VALUE_08BIT,
+				       (ctrl->val >> OV9281_GAIN_H_SHIFT) & OV9281_GAIN_H_MASK);
+		ret |= ov9281_write_reg(ov9281->client, OV9281_REG_GAIN_L,
+				       OV9281_REG_VALUE_08BIT,
+				       ctrl->val & OV9281_GAIN_L_MASK);
+		break;
+	case V4L2_CID_VBLANK:
+		ret = ov9281_write_reg(ov9281->client, OV9281_REG_VTS,
+				       OV9281_REG_VALUE_16BIT,
+				       ctrl->val + ov9281->cur_mode->height);
+		break;
+	case V4L2_CID_TEST_PATTERN:
+		ret = ov9281_enable_test_pattern(ov9281, ctrl->val);
+		break;
+	default:
+		dev_warn(&client->dev, "%s Unhandled id:0x%x, val:0x%x\n",
+			 __func__, ctrl->id, ctrl->val);
+		break;
+	}
+
+	pm_runtime_put(&client->dev);
+
+	return ret;
+}
+
+static const struct v4l2_ctrl_ops ov9281_ctrl_ops = {
+	.s_ctrl = ov9281_set_ctrl,
+};
+
+static int ov9281_initialize_controls(struct ov9281 *ov9281)
+{
+	const struct ov9281_mode *mode;
+	struct v4l2_ctrl_handler *handler;
+	struct v4l2_ctrl *ctrl;
+	s64 exposure_max, vblank_def;
+	u32 h_blank;
+	int ret;
+
+	handler = &ov9281->ctrl_handler;
+	mode = ov9281->cur_mode;
+	ret = v4l2_ctrl_handler_init(handler, 8);
+	if (ret)
+		return ret;
+	handler->lock = &ov9281->mutex;
+
+	ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
+				      0, 0, link_freq_menu_items);
+	if (ctrl)
+		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
+			  0, OV9281_PIXEL_RATE, 1, OV9281_PIXEL_RATE);
+
+	h_blank = mode->hts_def - mode->width;
+	ov9281->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
+				h_blank, h_blank, 1, h_blank);
+	if (ov9281->hblank)
+		ov9281->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	vblank_def = mode->vts_def - mode->height;
+	ov9281->vblank = v4l2_ctrl_new_std(handler, &ov9281_ctrl_ops,
+				V4L2_CID_VBLANK, vblank_def,
+				OV9281_VTS_MAX - mode->height,
+				1, vblank_def);
+
+	exposure_max = mode->vts_def - 4;
+	ov9281->exposure = v4l2_ctrl_new_std(handler, &ov9281_ctrl_ops,
+				V4L2_CID_EXPOSURE, OV9281_EXPOSURE_MIN,
+				exposure_max, OV9281_EXPOSURE_STEP,
+				mode->exp_def);
+
+	ov9281->anal_gain = v4l2_ctrl_new_std(handler, &ov9281_ctrl_ops,
+				V4L2_CID_ANALOGUE_GAIN, OV9281_GAIN_MIN,
+				OV9281_GAIN_MAX, OV9281_GAIN_STEP,
+				OV9281_GAIN_DEFAULT);
+
+	ov9281->test_pattern = v4l2_ctrl_new_std_menu_items(handler,
+				&ov9281_ctrl_ops, V4L2_CID_TEST_PATTERN,
+				ARRAY_SIZE(ov9281_test_pattern_menu) - 1,
+				0, 0, ov9281_test_pattern_menu);
+
+	if (handler->error) {
+		ret = handler->error;
+		dev_err(&ov9281->client->dev,
+			"Failed to init controls(%d)\n", ret);
+		goto err_free_handler;
+	}
+
+	ov9281->subdev.ctrl_handler = handler;
+
+	return 0;
+
+err_free_handler:
+	v4l2_ctrl_handler_free(handler);
+
+	return ret;
+}
+
+static int ov9281_check_sensor_id(struct ov9281 *ov9281,
+				  struct i2c_client *client)
+{
+	struct device *dev = &ov9281->client->dev;
+	u32 id = 0;
+	int ret;
+
+	ret = ov9281_read_reg(client, OV9281_REG_CHIP_ID,
+			      OV9281_REG_VALUE_16BIT, &id);
+	if (id != CHIP_ID) {
+		dev_err(dev, "Unexpected sensor id(%06x), ret(%d)\n", id, ret);
+		return -ENODEV;
+	}
+
+	dev_info(dev, "Detected OV%06x sensor\n", CHIP_ID);
+
+	return 0;
+}
+
+static int ov9281_configure_regulators(struct ov9281 *ov9281)
+{
+	unsigned int i;
+
+	for (i = 0; i < OV9281_NUM_SUPPLIES; i++)
+		ov9281->supplies[i].supply = ov9281_supply_names[i];
+
+	return devm_regulator_bulk_get(&ov9281->client->dev,
+				       OV9281_NUM_SUPPLIES,
+				       ov9281->supplies);
+}
+
+static int ov9281_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct device_node *node = dev->of_node;
+	struct ov9281 *ov9281;
+	struct v4l2_subdev *sd;
+	char facing[2];
+	int ret;
+
+	dev_info(dev, "driver version: %02x.%02x.%02x",
+		DRIVER_VERSION >> 16,
+		(DRIVER_VERSION & 0xff00) >> 8,
+		DRIVER_VERSION & 0x00ff);
+
+	ov9281 = devm_kzalloc(dev, sizeof(*ov9281), GFP_KERNEL);
+	if (!ov9281)
+		return -ENOMEM;
+
+	ret = of_property_read_u32(node, RKMODULE_CAMERA_MODULE_INDEX,
+				   &ov9281->module_index);
+	ret |= of_property_read_string(node, RKMODULE_CAMERA_MODULE_FACING,
+				       &ov9281->module_facing);
+	ret |= of_property_read_string(node, RKMODULE_CAMERA_MODULE_NAME,
+				       &ov9281->module_name);
+	ret |= of_property_read_string(node, RKMODULE_CAMERA_LENS_NAME,
+				       &ov9281->len_name);
+	if (ret) {
+		dev_err(dev, "could not get module information!\n");
+		return -EINVAL;
+	}
+
+	ov9281->client = client;
+	ov9281->cur_mode = &supported_modes[0];
+
+	ov9281->xvclk = devm_clk_get(dev, "xvclk");
+	if (IS_ERR(ov9281->xvclk)) {
+		dev_err(dev, "Failed to get xvclk\n");
+		return -EINVAL;
+	}
+	ret = clk_set_rate(ov9281->xvclk, OV9281_XVCLK_FREQ);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set xvclk rate (24MHz)\n");
+		return ret;
+	}
+	if (clk_get_rate(ov9281->xvclk) != OV9281_XVCLK_FREQ)
+		dev_warn(dev, "xvclk mismatched, modes are based on 24MHz\n");
+
+	ov9281->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(ov9281->reset_gpio))
+		dev_warn(dev, "Failed to get reset-gpios\n");
+
+	ov9281->pwdn_gpio = devm_gpiod_get(dev, "pwdn", GPIOD_OUT_LOW);
+	if (IS_ERR(ov9281->pwdn_gpio))
+		dev_warn(dev, "Failed to get pwdn-gpios\n");
+
+	ov9281->pinctrl = devm_pinctrl_get(dev);
+	if (!IS_ERR(ov9281->pinctrl)) {
+		ov9281->pins_default =
+			pinctrl_lookup_state(ov9281->pinctrl,
+					     OF_CAMERA_PINCTRL_STATE_DEFAULT);
+		if (IS_ERR(ov9281->pins_default))
+			dev_err(dev, "could not get default pinstate\n");
+
+		ov9281->pins_sleep =
+			pinctrl_lookup_state(ov9281->pinctrl,
+					     OF_CAMERA_PINCTRL_STATE_SLEEP);
+		if (IS_ERR(ov9281->pins_sleep))
+			dev_err(dev, "could not get sleep pinstate\n");
+	} else {
+		dev_err(dev, "no pinctrl\n");
+	}
+
+	ret = ov9281_configure_regulators(ov9281);
+	if (ret) {
+		dev_err(dev, "Failed to get power regulators\n");
+		return ret;
+	}
+
+	mutex_init(&ov9281->mutex);
+
+	sd = &ov9281->subdev;
+	v4l2_i2c_subdev_init(sd, client, &ov9281_subdev_ops);
+	ret = ov9281_initialize_controls(ov9281);
+	if (ret)
+		goto err_destroy_mutex;
+
+	ret = __ov9281_power_on(ov9281);
+	if (ret)
+		goto err_free_handler;
+
+	ret = ov9281_check_sensor_id(ov9281, client);
+	if (ret)
+		goto err_power_off;
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+	sd->internal_ops = &ov9281_internal_ops;
+	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+#endif
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	ov9281->pad.flags = MEDIA_PAD_FL_SOURCE;
+	sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV_SENSOR;
+	ret = media_entity_init(&sd->entity, 1, &ov9281->pad, 0);
+	if (ret < 0)
+		goto err_power_off;
+#endif
+
+	memset(facing, 0, sizeof(facing));
+	if (strcmp(ov9281->module_facing, "back") == 0)
+		facing[0] = 'b';
+	else
+		facing[0] = 'f';
+
+	snprintf(sd->name, sizeof(sd->name), "m%02d_%s_%s %s",
+		 ov9281->module_index, facing,
+		 OV9281_NAME, dev_name(sd->dev));
+	ret = v4l2_async_register_subdev_sensor_common(sd);
+	if (ret) {
+		dev_err(dev, "v4l2 async register subdev failed\n");
+		goto err_clean_entity;
+	}
+
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	pm_runtime_idle(dev);
+
+	return 0;
+
+err_clean_entity:
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	media_entity_cleanup(&sd->entity);
+#endif
+err_power_off:
+	__ov9281_power_off(ov9281);
+err_free_handler:
+	v4l2_ctrl_handler_free(&ov9281->ctrl_handler);
+err_destroy_mutex:
+	mutex_destroy(&ov9281->mutex);
+
+	return ret;
+}
+
+static int ov9281_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov9281 *ov9281 = to_ov9281(sd);
+
+	v4l2_async_unregister_subdev(sd);
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	media_entity_cleanup(&sd->entity);
+#endif
+	v4l2_ctrl_handler_free(&ov9281->ctrl_handler);
+	mutex_destroy(&ov9281->mutex);
+
+	pm_runtime_disable(&client->dev);
+	if (!pm_runtime_status_suspended(&client->dev))
+		__ov9281_power_off(ov9281);
+	pm_runtime_set_suspended(&client->dev);
+
+	return 0;
+}
+
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id ov9281_of_match[] = {
+	{ .compatible = "ovti,ov9281" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, ov9281_of_match);
+#endif
+
+static const struct i2c_device_id ov9281_match_id[] = {
+	{ "ovti,ov9281", 0 },
+	{ },
+};
+
+static struct i2c_driver ov9281_i2c_driver = {
+	.driver = {
+		.name = OV9281_NAME,
+		.pm = &ov9281_pm_ops,
+		.of_match_table = of_match_ptr(ov9281_of_match),
+	},
+	.probe		= &ov9281_probe,
+	.remove		= &ov9281_remove,
+	.id_table	= ov9281_match_id,
+};
+
+static int __init sensor_mod_init(void)
+{
+	return i2c_add_driver(&ov9281_i2c_driver);
+}
+
+static void __exit sensor_mod_exit(void)
+{
+	i2c_del_driver(&ov9281_i2c_driver);
+}
+
+device_initcall_sync(sensor_mod_init);
+module_exit(sensor_mod_exit);
+
+MODULE_DESCRIPTION("OmniVision ov9281 sensor driver");
+MODULE_LICENSE("GPL v2");
