drivers/media/i2c/ov2685.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * ov2685 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 <media/media-entity.h>
 #include <media/v4l2-async.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-subdev.h>

 #define CHIP_ID				0x2685
 #define OV2685_REG_CHIP_ID		0x300a

 #define OV2685_XVCLK_FREQ		24000000

 #define REG_SC_CTRL_MODE		0x0100
 #define     SC_CTRL_MODE_STANDBY	0x0
 #define     SC_CTRL_MODE_STREAMING	BIT(0)

 #define OV2685_REG_EXPOSURE		0x3500
 #define	OV2685_EXPOSURE_MIN		4
 #define	OV2685_EXPOSURE_STEP		1

 #define OV2685_REG_VTS			0x380e
 #define OV2685_VTS_MAX			0x7fff

 #define OV2685_REG_GAIN			0x350a
 #define OV2685_GAIN_MIN			0
 #define OV2685_GAIN_MAX			0x07ff
 #define OV2685_GAIN_STEP		0x1
 #define OV2685_GAIN_DEFAULT		0x0036

 #define OV2685_REG_TEST_PATTERN		0x5080
 #define OV2685_TEST_PATTERN_DISABLED		0x00
 #define OV2685_TEST_PATTERN_COLOR_BAR		0x80
 #define OV2685_TEST_PATTERN_RANDOM		0x81
 #define OV2685_TEST_PATTERN_COLOR_BAR_FADE	0x88
 #define OV2685_TEST_PATTERN_BW_SQUARE		0x92
 #define OV2685_TEST_PATTERN_COLOR_SQUARE	0x82

 #define REG_NULL			0xFFFF

 #define OV2685_REG_VALUE_08BIT		1
 #define OV2685_REG_VALUE_16BIT		2
 #define OV2685_REG_VALUE_24BIT		3

 #define OV2685_LANES			1
 #define OV2685_BITS_PER_SAMPLE		10

 static const char * const ov2685_supply_names[] = {
 	"avdd",		/* Analog power */
 	"dovdd",	/* Digital I/O power */
 	"dvdd",		/* Digital core power */
 };

 #define OV2685_NUM_SUPPLIES ARRAY_SIZE(ov2685_supply_names)

 struct regval {
 	u16 addr;
 	u8 val;
 };

 struct ov2685_mode {
 	u32 width;
 	u32 height;
 	u32 exp_def;
 	u32 hts_def;
 	u32 vts_def;
 	const struct regval *reg_list;
 };

 struct ov2685 {
 	struct i2c_client	*client;
 	struct clk		*xvclk;
 	struct gpio_desc	*reset_gpio;
 	struct regulator_bulk_data supplies[OV2685_NUM_SUPPLIES];

 	bool			streaming;
 	struct mutex		mutex;
 	struct v4l2_subdev	subdev;
 	struct media_pad	pad;
 	struct v4l2_ctrl	*anal_gain;
 	struct v4l2_ctrl	*exposure;
 	struct v4l2_ctrl	*hblank;
 	struct v4l2_ctrl	*vblank;
 	struct v4l2_ctrl	*test_pattern;
 	struct v4l2_ctrl_handler ctrl_handler;

 	const struct ov2685_mode *cur_mode;
 };

 #define to_ov2685(sd) container_of(sd, struct ov2685, subdev)

 /* PLL settings bases on 24M xvclk */
 static struct regval ov2685_1600x1200_regs[] = {
 	{0x0103, 0x01},
 	{0x0100, 0x00},
 	{0x3002, 0x00},
 	{0x3016, 0x1c},
 	{0x3018, 0x44},
 	{0x301d, 0xf0},
 	{0x3020, 0x00},
 	{0x3082, 0x37},
 	{0x3083, 0x03},
 	{0x3084, 0x09},
 	{0x3085, 0x04},
 	{0x3086, 0x00},
 	{0x3087, 0x00},
 	{0x3501, 0x4e},
 	{0x3502, 0xe0},
 	{0x3503, 0x27},
 	{0x350b, 0x36},
 	{0x3600, 0xb4},
 	{0x3603, 0x35},
 	{0x3604, 0x24},
 	{0x3605, 0x00},
 	{0x3620, 0x24},
 	{0x3621, 0x34},
 	{0x3622, 0x03},
 	{0x3628, 0x10},
 	{0x3705, 0x3c},
 	{0x370a, 0x21},
 	{0x370c, 0x50},
 	{0x370d, 0xc0},
 	{0x3717, 0x58},
 	{0x3718, 0x80},
 	{0x3720, 0x00},
 	{0x3721, 0x09},
 	{0x3722, 0x06},
 	{0x3723, 0x59},
 	{0x3738, 0x99},
 	{0x3781, 0x80},
 	{0x3784, 0x0c},
 	{0x3789, 0x60},
 	{0x3800, 0x00},
 	{0x3801, 0x00},
 	{0x3802, 0x00},
 	{0x3803, 0x00},
 	{0x3804, 0x06},
 	{0x3805, 0x4f},
 	{0x3806, 0x04},
 	{0x3807, 0xbf},
 	{0x3808, 0x06},
 	{0x3809, 0x40},
 	{0x380a, 0x04},
 	{0x380b, 0xb0},
 	{0x380c, 0x06},
 	{0x380d, 0xa4},
 	{0x380e, 0x05},
 	{0x380f, 0x0e},
 	{0x3810, 0x00},
 	{0x3811, 0x08},
 	{0x3812, 0x00},
 	{0x3813, 0x08},
 	{0x3814, 0x11},
 	{0x3815, 0x11},
 	{0x3819, 0x04},
 	{0x3820, 0xc0},
 	{0x3821, 0x00},
 	{0x3a06, 0x01},
 	{0x3a07, 0x84},
 	{0x3a08, 0x01},
 	{0x3a09, 0x43},
 	{0x3a0a, 0x24},
 	{0x3a0b, 0x60},
 	{0x3a0c, 0x28},
 	{0x3a0d, 0x60},
 	{0x3a0e, 0x04},
 	{0x3a0f, 0x8c},
 	{0x3a10, 0x05},
 	{0x3a11, 0x0c},
 	{0x4000, 0x81},
 	{0x4001, 0x40},
 	{0x4008, 0x02},
 	{0x4009, 0x09},
 	{0x4300, 0x00},
 	{0x430e, 0x00},
 	{0x4602, 0x02},
 	{0x481b, 0x40},
 	{0x481f, 0x40},
 	{0x4837, 0x18},
 	{0x5000, 0x1f},
 	{0x5001, 0x05},
 	{0x5002, 0x30},
 	{0x5003, 0x04},
 	{0x5004, 0x00},
 	{0x5005, 0x0c},
 	{0x5280, 0x15},
 	{0x5281, 0x06},
 	{0x5282, 0x06},
 	{0x5283, 0x08},
 	{0x5284, 0x1c},
 	{0x5285, 0x1c},
 	{0x5286, 0x20},
 	{0x5287, 0x10},
 	{REG_NULL, 0x00}
 };

 #define OV2685_LINK_FREQ_330MHZ		330000000
 static const s64 link_freq_menu_items[] = {
 	OV2685_LINK_FREQ_330MHZ
 };

 static const char * const ov2685_test_pattern_menu[] = {
 	"Disabled",
 	"Color Bar",
 	"Color Bar FADE",
 	"Random Data",
 	"Black White Square",
 	"Color Square"
 };

 static const int ov2685_test_pattern_val[] = {
 	OV2685_TEST_PATTERN_DISABLED,
 	OV2685_TEST_PATTERN_COLOR_BAR,
 	OV2685_TEST_PATTERN_COLOR_BAR_FADE,
 	OV2685_TEST_PATTERN_RANDOM,
 	OV2685_TEST_PATTERN_BW_SQUARE,
 	OV2685_TEST_PATTERN_COLOR_SQUARE,
 };

 static const struct ov2685_mode supported_modes[] = {
 	{
 		.width = 1600,
 		.height = 1200,
 		.exp_def = 0x04ee,
 		.hts_def = 0x06a4,
 		.vts_def = 0x050e,
 		.reg_list = ov2685_1600x1200_regs,
 	},
 };

 /* Write registers up to 4 at a time */
 static int ov2685_write_reg(struct i2c_client *client, u16 reg,
 			    u32 len, u32 val)
 {
 	u32 val_i, buf_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 ov2685_write_array(struct i2c_client *client,
 			      const struct regval *regs)
 {
 	int ret = 0;
 	u32 i;

 	for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++)
 		ret = ov2685_write_reg(client, regs[i].addr,
 				       OV2685_REG_VALUE_08BIT, regs[i].val);

 	return ret;
 }

 /* Read registers up to 4 at a time */
 static int ov2685_read_reg(struct i2c_client *client, u16 reg,
 			   u32 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)
 		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 void ov2685_fill_fmt(const struct ov2685_mode *mode,
 			    struct v4l2_mbus_framefmt *fmt)
 {
 	fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
 	fmt->width = mode->width;
 	fmt->height = mode->height;
 	fmt->field = V4L2_FIELD_NONE;
 }

 static int ov2685_set_fmt(struct v4l2_subdev *sd,
 			  struct v4l2_subdev_state *sd_state,
 			  struct v4l2_subdev_format *fmt)
 {
 	struct ov2685 *ov2685 = to_ov2685(sd);
 	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;

 	/* only one mode supported for now */
 	ov2685_fill_fmt(ov2685->cur_mode, mbus_fmt);

 	return 0;
 }

 static int ov2685_get_fmt(struct v4l2_subdev *sd,
 			  struct v4l2_subdev_state *sd_state,
 			  struct v4l2_subdev_format *fmt)
 {
 	struct ov2685 *ov2685 = to_ov2685(sd);
 	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;

 	ov2685_fill_fmt(ov2685->cur_mode, mbus_fmt);

 	return 0;
 }

 static int ov2685_enum_mbus_code(struct v4l2_subdev *sd,
 				 struct v4l2_subdev_state *sd_state,
 				 struct v4l2_subdev_mbus_code_enum *code)
 {
 	if (code->index >= ARRAY_SIZE(supported_modes))
 		return -EINVAL;

 	code->code = MEDIA_BUS_FMT_SBGGR10_1X10;

 	return 0;
 }

 static int ov2685_enum_frame_sizes(struct v4l2_subdev *sd,
 				   struct v4l2_subdev_state *sd_state,
 				   struct v4l2_subdev_frame_size_enum *fse)
 {
 	int index = fse->index;

 	if (index >= ARRAY_SIZE(supported_modes))
 		return -EINVAL;

 	fse->code = MEDIA_BUS_FMT_SBGGR10_1X10;

 	fse->min_width  = supported_modes[index].width;
 	fse->max_width  = supported_modes[index].width;
 	fse->max_height = supported_modes[index].height;
 	fse->min_height = supported_modes[index].height;

 	return 0;
 }

 /* Calculate the delay in us by clock rate and clock cycles */
 static inline u32 ov2685_cal_delay(u32 cycles)
 {
 	return DIV_ROUND_UP(cycles, OV2685_XVCLK_FREQ / 1000 / 1000);
 }

 static int __ov2685_power_on(struct ov2685 *ov2685)
 {
 	int ret;
 	u32 delay_us;
 	struct device *dev = &ov2685->client->dev;

 	ret = clk_prepare_enable(ov2685->xvclk);
 	if (ret < 0) {
 		dev_err(dev, "Failed to enable xvclk\n");
 		return ret;
 	}

 	gpiod_set_value_cansleep(ov2685->reset_gpio, 1);

 	ret = regulator_bulk_enable(OV2685_NUM_SUPPLIES, ov2685->supplies);
 	if (ret < 0) {
 		dev_err(dev, "Failed to enable regulators\n");
 		goto disable_clk;
 	}

 	/* The minimum delay between power supplies and reset rising can be 0 */
 	gpiod_set_value_cansleep(ov2685->reset_gpio, 0);
 	/* 8192 xvclk cycles prior to the first SCCB transaction */
 	delay_us = ov2685_cal_delay(8192);
 	usleep_range(delay_us, delay_us * 2);

 	/* HACK: ov2685 would output messy data after reset(R0103),
 	 * writing register before .s_stream() as a workaround
 	 */
 	ret = ov2685_write_array(ov2685->client, ov2685->cur_mode->reg_list);
 	if (ret)
 		goto disable_supplies;

 	return 0;

 disable_supplies:
 	regulator_bulk_disable(OV2685_NUM_SUPPLIES, ov2685->supplies);
 disable_clk:
 	clk_disable_unprepare(ov2685->xvclk);

 	return ret;
 }

 static void __ov2685_power_off(struct ov2685 *ov2685)
 {
 	/* 512 xvclk cycles after the last SCCB transaction or MIPI frame end */
 	u32 delay_us = ov2685_cal_delay(512);

 	usleep_range(delay_us, delay_us * 2);
 	clk_disable_unprepare(ov2685->xvclk);
 	gpiod_set_value_cansleep(ov2685->reset_gpio, 1);
 	regulator_bulk_disable(OV2685_NUM_SUPPLIES, ov2685->supplies);
 }

 static int ov2685_s_stream(struct v4l2_subdev *sd, int on)
 {
 	struct ov2685 *ov2685 = to_ov2685(sd);
 	struct i2c_client *client = ov2685->client;
 	int ret = 0;

 	mutex_lock(&ov2685->mutex);

 	on = !!on;
 	if (on == ov2685->streaming)
 		goto unlock_and_return;

 	if (on) {
 		ret = pm_runtime_resume_and_get(&ov2685->client->dev);
 		if (ret < 0)
 			goto unlock_and_return;

 		ret = __v4l2_ctrl_handler_setup(&ov2685->ctrl_handler);
 		if (ret) {
 			pm_runtime_put(&client->dev);
 			goto unlock_and_return;
 		}
 		ret = ov2685_write_reg(client, REG_SC_CTRL_MODE,
 				OV2685_REG_VALUE_08BIT, SC_CTRL_MODE_STREAMING);
 		if (ret) {
 			pm_runtime_put(&client->dev);
 			goto unlock_and_return;
 		}
 	} else {
 		ov2685_write_reg(client, REG_SC_CTRL_MODE,
 				OV2685_REG_VALUE_08BIT, SC_CTRL_MODE_STANDBY);
 		pm_runtime_put(&ov2685->client->dev);
 	}

 	ov2685->streaming = on;

 unlock_and_return:
 	mutex_unlock(&ov2685->mutex);

 	return ret;
 }

 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
 static int ov2685_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 {
 	struct ov2685 *ov2685 = to_ov2685(sd);
 	struct v4l2_mbus_framefmt *try_fmt;

 	mutex_lock(&ov2685->mutex);

 	try_fmt = v4l2_subdev_get_try_format(sd, fh->state, 0);
 	/* Initialize try_fmt */
 	ov2685_fill_fmt(&supported_modes[0], try_fmt);

 	mutex_unlock(&ov2685->mutex);

 	return 0;
 }
 #endif

 static int __maybe_unused ov2685_runtime_resume(struct device *dev)
 {
 	struct v4l2_subdev *sd = dev_get_drvdata(dev);
 	struct ov2685 *ov2685 = to_ov2685(sd);

 	return __ov2685_power_on(ov2685);
 }

 static int __maybe_unused ov2685_runtime_suspend(struct device *dev)
 {
 	struct v4l2_subdev *sd = dev_get_drvdata(dev);
 	struct ov2685 *ov2685 = to_ov2685(sd);

 	__ov2685_power_off(ov2685);

 	return 0;
 }

 static const struct dev_pm_ops ov2685_pm_ops = {
 	SET_RUNTIME_PM_OPS(ov2685_runtime_suspend,
 			   ov2685_runtime_resume, NULL)
 };

 static int ov2685_set_ctrl(struct v4l2_ctrl *ctrl)
 {
 	struct ov2685 *ov2685 = container_of(ctrl->handler,
 					     struct ov2685, ctrl_handler);
 	struct i2c_client *client = ov2685->client;
 	s64 max_expo;
 	int ret;

 	/* Propagate change of current control to all related controls */
 	switch (ctrl->id) {
 	case V4L2_CID_VBLANK:
 		/* Update max exposure while meeting expected vblanking */
 		max_expo = ov2685->cur_mode->height + ctrl->val - 4;
 		__v4l2_ctrl_modify_range(ov2685->exposure,
 					 ov2685->exposure->minimum, max_expo,
 					 ov2685->exposure->step,
 					 ov2685->exposure->default_value);
 		break;
 	}

 	if (!pm_runtime_get_if_in_use(&client->dev))
 		return 0;

 	switch (ctrl->id) {
 	case V4L2_CID_EXPOSURE:
 		ret = ov2685_write_reg(ov2685->client, OV2685_REG_EXPOSURE,
 				       OV2685_REG_VALUE_24BIT, ctrl->val << 4);
 		break;
 	case V4L2_CID_ANALOGUE_GAIN:
 		ret = ov2685_write_reg(ov2685->client, OV2685_REG_GAIN,
 				       OV2685_REG_VALUE_16BIT, ctrl->val);
 		break;
 	case V4L2_CID_VBLANK:
 		ret = ov2685_write_reg(ov2685->client, OV2685_REG_VTS,
 				       OV2685_REG_VALUE_16BIT,
 				       ctrl->val + ov2685->cur_mode->height);
 		break;
 	case V4L2_CID_TEST_PATTERN:
 		ret = ov2685_write_reg(ov2685->client, OV2685_REG_TEST_PATTERN,
 				       OV2685_REG_VALUE_08BIT,
 				       ov2685_test_pattern_val[ctrl->val]);
 		break;
 	default:
 		dev_warn(&client->dev, "%s Unhandled id:0x%x, val:0x%x\n",
 			 __func__, ctrl->id, ctrl->val);
 		ret = -EINVAL;
 		break;
 	}

 	pm_runtime_put(&client->dev);

 	return ret;
 }

 static const struct v4l2_subdev_video_ops ov2685_video_ops = {
 	.s_stream = ov2685_s_stream,
 };

 static const struct v4l2_subdev_pad_ops ov2685_pad_ops = {
 	.enum_mbus_code = ov2685_enum_mbus_code,
 	.enum_frame_size = ov2685_enum_frame_sizes,
 	.get_fmt = ov2685_get_fmt,
 	.set_fmt = ov2685_set_fmt,
 };

 static const struct v4l2_subdev_ops ov2685_subdev_ops = {
 	.video	= &ov2685_video_ops,
 	.pad	= &ov2685_pad_ops,
 };

 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
 static const struct v4l2_subdev_internal_ops ov2685_internal_ops = {
 	.open = ov2685_open,
 };
 #endif

 static const struct v4l2_ctrl_ops ov2685_ctrl_ops = {
 	.s_ctrl = ov2685_set_ctrl,
 };

 static int ov2685_initialize_controls(struct ov2685 *ov2685)
 {
 	const struct ov2685_mode *mode;
 	struct v4l2_ctrl_handler *handler;
 	struct v4l2_ctrl *ctrl;
 	u64 exposure_max;
 	u32 pixel_rate, h_blank;
 	int ret;

 	handler = &ov2685->ctrl_handler;
 	mode = ov2685->cur_mode;
 	ret = v4l2_ctrl_handler_init(handler, 8);
 	if (ret)
 		return ret;
 	handler->lock = &ov2685->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;

 	pixel_rate = (link_freq_menu_items[0] * 2 * OV2685_LANES) /
 		     OV2685_BITS_PER_SAMPLE;
 	v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
 			  0, pixel_rate, 1, pixel_rate);

 	h_blank = mode->hts_def - mode->width;
 	ov2685->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
 				h_blank, h_blank, 1, h_blank);
 	if (ov2685->hblank)
 		ov2685->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;

 	ov2685->vblank = v4l2_ctrl_new_std(handler, &ov2685_ctrl_ops,
 				V4L2_CID_VBLANK, mode->vts_def - mode->height,
 				OV2685_VTS_MAX - mode->height, 1,
 				mode->vts_def - mode->height);

 	exposure_max = mode->vts_def - 4;
 	ov2685->exposure = v4l2_ctrl_new_std(handler, &ov2685_ctrl_ops,
 				V4L2_CID_EXPOSURE, OV2685_EXPOSURE_MIN,
 				exposure_max, OV2685_EXPOSURE_STEP,
 				mode->exp_def);

 	ov2685->anal_gain = v4l2_ctrl_new_std(handler, &ov2685_ctrl_ops,
 				V4L2_CID_ANALOGUE_GAIN, OV2685_GAIN_MIN,
 				OV2685_GAIN_MAX, OV2685_GAIN_STEP,
 				OV2685_GAIN_DEFAULT);

 	ov2685->test_pattern = v4l2_ctrl_new_std_menu_items(handler,
 				&ov2685_ctrl_ops, V4L2_CID_TEST_PATTERN,
 				ARRAY_SIZE(ov2685_test_pattern_menu) - 1,
 				0, 0, ov2685_test_pattern_menu);

 	if (handler->error) {
 		ret = handler->error;
 		dev_err(&ov2685->client->dev,
 			"Failed to init controls(%d)\n", ret);
 		goto err_free_handler;
 	}

 	ov2685->subdev.ctrl_handler = handler;

 	return 0;

 err_free_handler:
 	v4l2_ctrl_handler_free(handler);

 	return ret;
 }

 static int ov2685_check_sensor_id(struct ov2685 *ov2685,
 				  struct i2c_client *client)
 {
 	struct device *dev = &ov2685->client->dev;
 	int ret;
 	u32 id = 0;

 	ret = ov2685_read_reg(client, OV2685_REG_CHIP_ID,
 			      OV2685_REG_VALUE_16BIT, &id);
 	if (id != CHIP_ID) {
 		dev_err(dev, "Unexpected sensor id(%04x), ret(%d)\n", id, ret);
 		return ret;
 	}

 	dev_info(dev, "Detected OV%04x sensor\n", CHIP_ID);

 	return 0;
 }

 static int ov2685_configure_regulators(struct ov2685 *ov2685)
 {
 	int i;

 	for (i = 0; i < OV2685_NUM_SUPPLIES; i++)
 		ov2685->supplies[i].supply = ov2685_supply_names[i];

 	return devm_regulator_bulk_get(&ov2685->client->dev,
 				       OV2685_NUM_SUPPLIES,
 				       ov2685->supplies);
 }

 static int ov2685_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	struct device *dev = &client->dev;
 	struct ov2685 *ov2685;
 	int ret;

 	ov2685 = devm_kzalloc(dev, sizeof(*ov2685), GFP_KERNEL);
 	if (!ov2685)
 		return -ENOMEM;

 	ov2685->client = client;
 	ov2685->cur_mode = &supported_modes[0];

 	ov2685->xvclk = devm_clk_get(dev, "xvclk");
 	if (IS_ERR(ov2685->xvclk)) {
 		dev_err(dev, "Failed to get xvclk\n");
 		return -EINVAL;
 	}
 	ret = clk_set_rate(ov2685->xvclk, OV2685_XVCLK_FREQ);
 	if (ret < 0) {
 		dev_err(dev, "Failed to set xvclk rate (24MHz)\n");
 		return ret;
 	}
 	if (clk_get_rate(ov2685->xvclk) != OV2685_XVCLK_FREQ)
 		dev_warn(dev, "xvclk mismatched, modes are based on 24MHz\n");

 	ov2685->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
 	if (IS_ERR(ov2685->reset_gpio)) {
 		dev_err(dev, "Failed to get reset-gpios\n");
 		return -EINVAL;
 	}

 	ret = ov2685_configure_regulators(ov2685);
 	if (ret) {
 		dev_err(dev, "Failed to get power regulators\n");
 		return ret;
 	}

 	mutex_init(&ov2685->mutex);
 	v4l2_i2c_subdev_init(&ov2685->subdev, client, &ov2685_subdev_ops);
 	ret = ov2685_initialize_controls(ov2685);
 	if (ret)
 		goto err_destroy_mutex;

 	ret = __ov2685_power_on(ov2685);
 	if (ret)
 		goto err_free_handler;

 	ret = ov2685_check_sensor_id(ov2685, client);
 	if (ret)
 		goto err_power_off;

 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
 	ov2685->subdev.internal_ops = &ov2685_internal_ops;
 	ov2685->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 #endif
 #if defined(CONFIG_MEDIA_CONTROLLER)
 	ov2685->pad.flags = MEDIA_PAD_FL_SOURCE;
 	ov2685->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
 	ret = media_entity_pads_init(&ov2685->subdev.entity, 1, &ov2685->pad);
 	if (ret < 0)
 		goto err_power_off;
 #endif

 	ret = v4l2_async_register_subdev(&ov2685->subdev);
 	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(&ov2685->subdev.entity);
 #endif
 err_power_off:
 	__ov2685_power_off(ov2685);
 err_free_handler:
 	v4l2_ctrl_handler_free(&ov2685->ctrl_handler);
 err_destroy_mutex:
 	mutex_destroy(&ov2685->mutex);

 	return ret;
 }

 static int ov2685_remove(struct i2c_client *client)
 {
 	struct v4l2_subdev *sd = i2c_get_clientdata(client);
 	struct ov2685 *ov2685 = to_ov2685(sd);

 	v4l2_async_unregister_subdev(sd);
 #if defined(CONFIG_MEDIA_CONTROLLER)
 	media_entity_cleanup(&sd->entity);
 #endif
 	v4l2_ctrl_handler_free(&ov2685->ctrl_handler);
 	mutex_destroy(&ov2685->mutex);

 	pm_runtime_disable(&client->dev);
 	if (!pm_runtime_status_suspended(&client->dev))
 		__ov2685_power_off(ov2685);
 	pm_runtime_set_suspended(&client->dev);

 	return 0;
 }

 #if IS_ENABLED(CONFIG_OF)
 static const struct of_device_id ov2685_of_match[] = {
 	{ .compatible = "ovti,ov2685" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, ov2685_of_match);
 #endif

 static struct i2c_driver ov2685_i2c_driver = {
 	.driver = {
 		.name = "ov2685",
 		.pm = &ov2685_pm_ops,
 		.of_match_table = of_match_ptr(ov2685_of_match),
 	},
 	.probe		= &ov2685_probe,
 	.remove		= &ov2685_remove,
 };

 module_i2c_driver(ov2685_i2c_driver);

 MODULE_DESCRIPTION("OmniVision ov2685 sensor driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* ov2685 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 <media/media-entity.h>
	#include <media/v4l2-async.h>
	#include <media/v4l2-ctrls.h>
	#include <media/v4l2-subdev.h>

	#define CHIP_ID 0x2685
	#define OV2685_REG_CHIP_ID 0x300a

	#define OV2685_XVCLK_FREQ 24000000

	#define REG_SC_CTRL_MODE 0x0100
	#define SC_CTRL_MODE_STANDBY 0x0
	#define SC_CTRL_MODE_STREAMING BIT(0)

	#define OV2685_REG_EXPOSURE 0x3500
	#define OV2685_EXPOSURE_MIN 4
	#define OV2685_EXPOSURE_STEP 1

	#define OV2685_REG_VTS 0x380e
	#define OV2685_VTS_MAX 0x7fff

	#define OV2685_REG_GAIN 0x350a
	#define OV2685_GAIN_MIN 0
	#define OV2685_GAIN_MAX 0x07ff
	#define OV2685_GAIN_STEP 0x1
	#define OV2685_GAIN_DEFAULT 0x0036

	#define OV2685_REG_TEST_PATTERN 0x5080
	#define OV2685_TEST_PATTERN_DISABLED 0x00
	#define OV2685_TEST_PATTERN_COLOR_BAR 0x80
	#define OV2685_TEST_PATTERN_RANDOM 0x81
	#define OV2685_TEST_PATTERN_COLOR_BAR_FADE 0x88
	#define OV2685_TEST_PATTERN_BW_SQUARE 0x92
	#define OV2685_TEST_PATTERN_COLOR_SQUARE 0x82

	#define REG_NULL 0xFFFF

	#define OV2685_REG_VALUE_08BIT 1
	#define OV2685_REG_VALUE_16BIT 2
	#define OV2685_REG_VALUE_24BIT 3

	#define OV2685_LANES 1
	#define OV2685_BITS_PER_SAMPLE 10

	static const char * const ov2685_supply_names[] = {
	"avdd", /* Analog power */
	"dovdd", /* Digital I/O power */
	"dvdd", /* Digital core power */
	};

	#define OV2685_NUM_SUPPLIES ARRAY_SIZE(ov2685_supply_names)

	struct regval {
	u16 addr;
	u8 val;
	};

	struct ov2685_mode {
	u32 width;
	u32 height;
	u32 exp_def;
	u32 hts_def;
	u32 vts_def;
	const struct regval *reg_list;
	};

	struct ov2685 {
	struct i2c_client *client;
	struct clk *xvclk;
	struct gpio_desc *reset_gpio;
	struct regulator_bulk_data supplies[OV2685_NUM_SUPPLIES];

	bool streaming;
	struct mutex mutex;
	struct v4l2_subdev subdev;
	struct media_pad pad;
	struct v4l2_ctrl *anal_gain;
	struct v4l2_ctrl *exposure;
	struct v4l2_ctrl *hblank;
	struct v4l2_ctrl *vblank;
	struct v4l2_ctrl *test_pattern;
	struct v4l2_ctrl_handler ctrl_handler;

	const struct ov2685_mode *cur_mode;
	};

	#define to_ov2685(sd) container_of(sd, struct ov2685, subdev)

	/* PLL settings bases on 24M xvclk */
	static struct regval ov2685_1600x1200_regs[] = {
	{0x0103, 0x01},
	{0x0100, 0x00},
	{0x3002, 0x00},
	{0x3016, 0x1c},
	{0x3018, 0x44},
	{0x301d, 0xf0},
	{0x3020, 0x00},
	{0x3082, 0x37},
	{0x3083, 0x03},
	{0x3084, 0x09},
	{0x3085, 0x04},
	{0x3086, 0x00},
	{0x3087, 0x00},
	{0x3501, 0x4e},
	{0x3502, 0xe0},
	{0x3503, 0x27},
	{0x350b, 0x36},
	{0x3600, 0xb4},
	{0x3603, 0x35},
	{0x3604, 0x24},
	{0x3605, 0x00},
	{0x3620, 0x24},
	{0x3621, 0x34},
	{0x3622, 0x03},
	{0x3628, 0x10},
	{0x3705, 0x3c},
	{0x370a, 0x21},
	{0x370c, 0x50},
	{0x370d, 0xc0},
	{0x3717, 0x58},
	{0x3718, 0x80},
	{0x3720, 0x00},
	{0x3721, 0x09},
	{0x3722, 0x06},
	{0x3723, 0x59},
	{0x3738, 0x99},
	{0x3781, 0x80},
	{0x3784, 0x0c},
	{0x3789, 0x60},
	{0x3800, 0x00},
	{0x3801, 0x00},
	{0x3802, 0x00},
	{0x3803, 0x00},
	{0x3804, 0x06},
	{0x3805, 0x4f},
	{0x3806, 0x04},
	{0x3807, 0xbf},
	{0x3808, 0x06},
	{0x3809, 0x40},
	{0x380a, 0x04},
	{0x380b, 0xb0},
	{0x380c, 0x06},
	{0x380d, 0xa4},
	{0x380e, 0x05},
	{0x380f, 0x0e},
	{0x3810, 0x00},
	{0x3811, 0x08},
	{0x3812, 0x00},
	{0x3813, 0x08},
	{0x3814, 0x11},
	{0x3815, 0x11},
	{0x3819, 0x04},
	{0x3820, 0xc0},
	{0x3821, 0x00},
	{0x3a06, 0x01},
	{0x3a07, 0x84},
	{0x3a08, 0x01},
	{0x3a09, 0x43},
	{0x3a0a, 0x24},
	{0x3a0b, 0x60},
	{0x3a0c, 0x28},
	{0x3a0d, 0x60},
	{0x3a0e, 0x04},
	{0x3a0f, 0x8c},
	{0x3a10, 0x05},
	{0x3a11, 0x0c},
	{0x4000, 0x81},
	{0x4001, 0x40},
	{0x4008, 0x02},
	{0x4009, 0x09},
	{0x4300, 0x00},
	{0x430e, 0x00},
	{0x4602, 0x02},
	{0x481b, 0x40},
	{0x481f, 0x40},
	{0x4837, 0x18},
	{0x5000, 0x1f},
	{0x5001, 0x05},
	{0x5002, 0x30},
	{0x5003, 0x04},
	{0x5004, 0x00},
	{0x5005, 0x0c},
	{0x5280, 0x15},
	{0x5281, 0x06},
	{0x5282, 0x06},
	{0x5283, 0x08},
	{0x5284, 0x1c},
	{0x5285, 0x1c},
	{0x5286, 0x20},
	{0x5287, 0x10},
	{REG_NULL, 0x00}
	};

	#define OV2685_LINK_FREQ_330MHZ 330000000
	static const s64 link_freq_menu_items[] = {
	OV2685_LINK_FREQ_330MHZ
	};

	static const char * const ov2685_test_pattern_menu[] = {
	"Disabled",
	"Color Bar",
	"Color Bar FADE",
	"Random Data",
	"Black White Square",
	"Color Square"
	};

	static const int ov2685_test_pattern_val[] = {
	OV2685_TEST_PATTERN_DISABLED,
	OV2685_TEST_PATTERN_COLOR_BAR,
	OV2685_TEST_PATTERN_COLOR_BAR_FADE,
	OV2685_TEST_PATTERN_RANDOM,
	OV2685_TEST_PATTERN_BW_SQUARE,
	OV2685_TEST_PATTERN_COLOR_SQUARE,
	};

	static const struct ov2685_mode supported_modes[] = {
	{
	.width = 1600,
	.height = 1200,
	.exp_def = 0x04ee,
	.hts_def = 0x06a4,
	.vts_def = 0x050e,
	.reg_list = ov2685_1600x1200_regs,
	},
	};

	/* Write registers up to 4 at a time */
	static int ov2685_write_reg(struct i2c_client *client, u16 reg,
	u32 len, u32 val)
	{
	u32 val_i, buf_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 ov2685_write_array(struct i2c_client *client,
	const struct regval *regs)
	{
	int ret = 0;
	u32 i;

	for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++)
	ret = ov2685_write_reg(client, regs[i].addr,
	OV2685_REG_VALUE_08BIT, regs[i].val);

	return ret;
	}

	/* Read registers up to 4 at a time */
	static int ov2685_read_reg(struct i2c_client *client, u16 reg,
	u32 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)
	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 void ov2685_fill_fmt(const struct ov2685_mode *mode,
	struct v4l2_mbus_framefmt *fmt)
	{
	fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
	fmt->width = mode->width;
	fmt->height = mode->height;
	fmt->field = V4L2_FIELD_NONE;
	}

	static int ov2685_set_fmt(struct v4l2_subdev *sd,
	struct v4l2_subdev_state *sd_state,
	struct v4l2_subdev_format *fmt)
	{
	struct ov2685 *ov2685 = to_ov2685(sd);
	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;

	/* only one mode supported for now */
	ov2685_fill_fmt(ov2685->cur_mode, mbus_fmt);

	return 0;
	}

	static int ov2685_get_fmt(struct v4l2_subdev *sd,
	struct v4l2_subdev_state *sd_state,
	struct v4l2_subdev_format *fmt)
	{
	struct ov2685 *ov2685 = to_ov2685(sd);
	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;

	ov2685_fill_fmt(ov2685->cur_mode, mbus_fmt);

	return 0;
	}

	static int ov2685_enum_mbus_code(struct v4l2_subdev *sd,
	struct v4l2_subdev_state *sd_state,
	struct v4l2_subdev_mbus_code_enum *code)
	{
	if (code->index >= ARRAY_SIZE(supported_modes))
	return -EINVAL;

	code->code = MEDIA_BUS_FMT_SBGGR10_1X10;

	return 0;
	}

	static int ov2685_enum_frame_sizes(struct v4l2_subdev *sd,
	struct v4l2_subdev_state *sd_state,
	struct v4l2_subdev_frame_size_enum *fse)
	{
	int index = fse->index;

	if (index >= ARRAY_SIZE(supported_modes))
	return -EINVAL;

	fse->code = MEDIA_BUS_FMT_SBGGR10_1X10;

	fse->min_width = supported_modes[index].width;
	fse->max_width = supported_modes[index].width;
	fse->max_height = supported_modes[index].height;
	fse->min_height = supported_modes[index].height;

	return 0;
	}

	/* Calculate the delay in us by clock rate and clock cycles */
	static inline u32 ov2685_cal_delay(u32 cycles)
	{
	return DIV_ROUND_UP(cycles, OV2685_XVCLK_FREQ / 1000 / 1000);
	}

	static int __ov2685_power_on(struct ov2685 *ov2685)
	{
	int ret;
	u32 delay_us;
	struct device *dev = &ov2685->client->dev;

	ret = clk_prepare_enable(ov2685->xvclk);
	if (ret < 0) {
	dev_err(dev, "Failed to enable xvclk\n");
	return ret;
	}

	gpiod_set_value_cansleep(ov2685->reset_gpio, 1);

	ret = regulator_bulk_enable(OV2685_NUM_SUPPLIES, ov2685->supplies);
	if (ret < 0) {
	dev_err(dev, "Failed to enable regulators\n");
	goto disable_clk;
	}

	/* The minimum delay between power supplies and reset rising can be 0 */
	gpiod_set_value_cansleep(ov2685->reset_gpio, 0);
	/* 8192 xvclk cycles prior to the first SCCB transaction */
	delay_us = ov2685_cal_delay(8192);
	usleep_range(delay_us, delay_us * 2);

	/* HACK: ov2685 would output messy data after reset(R0103),
	* writing register before .s_stream() as a workaround
	*/
	ret = ov2685_write_array(ov2685->client, ov2685->cur_mode->reg_list);
	if (ret)
	goto disable_supplies;

	return 0;

	disable_supplies:
	regulator_bulk_disable(OV2685_NUM_SUPPLIES, ov2685->supplies);
	disable_clk:
	clk_disable_unprepare(ov2685->xvclk);

	return ret;
	}

	static void __ov2685_power_off(struct ov2685 *ov2685)
	{
	/* 512 xvclk cycles after the last SCCB transaction or MIPI frame end */
	u32 delay_us = ov2685_cal_delay(512);

	usleep_range(delay_us, delay_us * 2);
	clk_disable_unprepare(ov2685->xvclk);
	gpiod_set_value_cansleep(ov2685->reset_gpio, 1);
	regulator_bulk_disable(OV2685_NUM_SUPPLIES, ov2685->supplies);
	}

	static int ov2685_s_stream(struct v4l2_subdev *sd, int on)
	{
	struct ov2685 *ov2685 = to_ov2685(sd);
	struct i2c_client *client = ov2685->client;
	int ret = 0;

	mutex_lock(&ov2685->mutex);

	on = !!on;
	if (on == ov2685->streaming)
	goto unlock_and_return;

	if (on) {
	ret = pm_runtime_resume_and_get(&ov2685->client->dev);
	if (ret < 0)
	goto unlock_and_return;

	ret = __v4l2_ctrl_handler_setup(&ov2685->ctrl_handler);
	if (ret) {
	pm_runtime_put(&client->dev);
	goto unlock_and_return;
	}
	ret = ov2685_write_reg(client, REG_SC_CTRL_MODE,
	OV2685_REG_VALUE_08BIT, SC_CTRL_MODE_STREAMING);
	if (ret) {
	pm_runtime_put(&client->dev);
	goto unlock_and_return;
	}
	} else {
	ov2685_write_reg(client, REG_SC_CTRL_MODE,
	OV2685_REG_VALUE_08BIT, SC_CTRL_MODE_STANDBY);
	pm_runtime_put(&ov2685->client->dev);
	}

	ov2685->streaming = on;

	unlock_and_return:
	mutex_unlock(&ov2685->mutex);

	return ret;
	}

	#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
	static int ov2685_open(struct v4l2_subdev sd, struct v4l2_subdev_fh fh)
	{
	struct ov2685 *ov2685 = to_ov2685(sd);
	struct v4l2_mbus_framefmt *try_fmt;

	mutex_lock(&ov2685->mutex);

	try_fmt = v4l2_subdev_get_try_format(sd, fh->state, 0);
	/* Initialize try_fmt */
	ov2685_fill_fmt(&supported_modes[0], try_fmt);

	mutex_unlock(&ov2685->mutex);

	return 0;
	}
	#endif

	static int __maybe_unused ov2685_runtime_resume(struct device *dev)
	{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct ov2685 *ov2685 = to_ov2685(sd);

	return __ov2685_power_on(ov2685);
	}

	static int __maybe_unused ov2685_runtime_suspend(struct device *dev)
	{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct ov2685 *ov2685 = to_ov2685(sd);

	__ov2685_power_off(ov2685);

	return 0;
	}

	static const struct dev_pm_ops ov2685_pm_ops = {
	SET_RUNTIME_PM_OPS(ov2685_runtime_suspend,
	ov2685_runtime_resume, NULL)
	};

	static int ov2685_set_ctrl(struct v4l2_ctrl *ctrl)
	{
	struct ov2685 *ov2685 = container_of(ctrl->handler,
	struct ov2685, ctrl_handler);
	struct i2c_client *client = ov2685->client;
	s64 max_expo;
	int ret;

	/* Propagate change of current control to all related controls */
	switch (ctrl->id) {
	case V4L2_CID_VBLANK:
	/* Update max exposure while meeting expected vblanking */
	max_expo = ov2685->cur_mode->height + ctrl->val - 4;
	__v4l2_ctrl_modify_range(ov2685->exposure,
	ov2685->exposure->minimum, max_expo,
	ov2685->exposure->step,
	ov2685->exposure->default_value);
	break;
	}

	if (!pm_runtime_get_if_in_use(&client->dev))
	return 0;

	switch (ctrl->id) {
	case V4L2_CID_EXPOSURE:
	ret = ov2685_write_reg(ov2685->client, OV2685_REG_EXPOSURE,
	OV2685_REG_VALUE_24BIT, ctrl->val << 4);
	break;
	case V4L2_CID_ANALOGUE_GAIN:
	ret = ov2685_write_reg(ov2685->client, OV2685_REG_GAIN,
	OV2685_REG_VALUE_16BIT, ctrl->val);
	break;
	case V4L2_CID_VBLANK:
	ret = ov2685_write_reg(ov2685->client, OV2685_REG_VTS,
	OV2685_REG_VALUE_16BIT,
	ctrl->val + ov2685->cur_mode->height);
	break;
	case V4L2_CID_TEST_PATTERN:
	ret = ov2685_write_reg(ov2685->client, OV2685_REG_TEST_PATTERN,
	OV2685_REG_VALUE_08BIT,
	ov2685_test_pattern_val[ctrl->val]);
	break;
	default:
	dev_warn(&client->dev, "%s Unhandled id:0x%x, val:0x%x\n",
	__func__, ctrl->id, ctrl->val);
	ret = -EINVAL;
	break;
	}

	pm_runtime_put(&client->dev);

	return ret;
	}

	static const struct v4l2_subdev_video_ops ov2685_video_ops = {
	.s_stream = ov2685_s_stream,
	};

	static const struct v4l2_subdev_pad_ops ov2685_pad_ops = {
	.enum_mbus_code = ov2685_enum_mbus_code,
	.enum_frame_size = ov2685_enum_frame_sizes,
	.get_fmt = ov2685_get_fmt,
	.set_fmt = ov2685_set_fmt,
	};

	static const struct v4l2_subdev_ops ov2685_subdev_ops = {
	.video = &ov2685_video_ops,
	.pad = &ov2685_pad_ops,
	};

	#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
	static const struct v4l2_subdev_internal_ops ov2685_internal_ops = {
	.open = ov2685_open,
	};
	#endif

	static const struct v4l2_ctrl_ops ov2685_ctrl_ops = {
	.s_ctrl = ov2685_set_ctrl,
	};

	static int ov2685_initialize_controls(struct ov2685 *ov2685)
	{
	const struct ov2685_mode *mode;
	struct v4l2_ctrl_handler *handler;
	struct v4l2_ctrl *ctrl;
	u64 exposure_max;
	u32 pixel_rate, h_blank;
	int ret;

	handler = &ov2685->ctrl_handler;
	mode = ov2685->cur_mode;
	ret = v4l2_ctrl_handler_init(handler, 8);
	if (ret)
	return ret;
	handler->lock = &ov2685->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;

	pixel_rate = (link_freq_menu_items[0] * 2 * OV2685_LANES) /
	OV2685_BITS_PER_SAMPLE;
	v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
	0, pixel_rate, 1, pixel_rate);

	h_blank = mode->hts_def - mode->width;
	ov2685->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
	h_blank, h_blank, 1, h_blank);
	if (ov2685->hblank)
	ov2685->hblank->flags \|= V4L2_CTRL_FLAG_READ_ONLY;

	ov2685->vblank = v4l2_ctrl_new_std(handler, &ov2685_ctrl_ops,
	V4L2_CID_VBLANK, mode->vts_def - mode->height,
	OV2685_VTS_MAX - mode->height, 1,
	mode->vts_def - mode->height);

	exposure_max = mode->vts_def - 4;
	ov2685->exposure = v4l2_ctrl_new_std(handler, &ov2685_ctrl_ops,
	V4L2_CID_EXPOSURE, OV2685_EXPOSURE_MIN,
	exposure_max, OV2685_EXPOSURE_STEP,
	mode->exp_def);

	ov2685->anal_gain = v4l2_ctrl_new_std(handler, &ov2685_ctrl_ops,
	V4L2_CID_ANALOGUE_GAIN, OV2685_GAIN_MIN,
	OV2685_GAIN_MAX, OV2685_GAIN_STEP,
	OV2685_GAIN_DEFAULT);

	ov2685->test_pattern = v4l2_ctrl_new_std_menu_items(handler,
	&ov2685_ctrl_ops, V4L2_CID_TEST_PATTERN,
	ARRAY_SIZE(ov2685_test_pattern_menu) - 1,
	0, 0, ov2685_test_pattern_menu);

	if (handler->error) {
	ret = handler->error;
	dev_err(&ov2685->client->dev,
	"Failed to init controls(%d)\n", ret);
	goto err_free_handler;
	}

	ov2685->subdev.ctrl_handler = handler;

	return 0;

	err_free_handler:
	v4l2_ctrl_handler_free(handler);

	return ret;
	}

	static int ov2685_check_sensor_id(struct ov2685 *ov2685,
	struct i2c_client *client)
	{
	struct device *dev = &ov2685->client->dev;
	int ret;
	u32 id = 0;

	ret = ov2685_read_reg(client, OV2685_REG_CHIP_ID,
	OV2685_REG_VALUE_16BIT, &id);
	if (id != CHIP_ID) {
	dev_err(dev, "Unexpected sensor id(%04x), ret(%d)\n", id, ret);
	return ret;
	}

	dev_info(dev, "Detected OV%04x sensor\n", CHIP_ID);

	return 0;
	}

	static int ov2685_configure_regulators(struct ov2685 *ov2685)
	{
	int i;

	for (i = 0; i < OV2685_NUM_SUPPLIES; i++)
	ov2685->supplies[i].supply = ov2685_supply_names[i];

	return devm_regulator_bulk_get(&ov2685->client->dev,
	OV2685_NUM_SUPPLIES,
	ov2685->supplies);
	}

	static int ov2685_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct device *dev = &client->dev;
	struct ov2685 *ov2685;
	int ret;

	ov2685 = devm_kzalloc(dev, sizeof(*ov2685), GFP_KERNEL);
	if (!ov2685)
	return -ENOMEM;

	ov2685->client = client;
	ov2685->cur_mode = &supported_modes[0];

	ov2685->xvclk = devm_clk_get(dev, "xvclk");
	if (IS_ERR(ov2685->xvclk)) {
	dev_err(dev, "Failed to get xvclk\n");
	return -EINVAL;
	}
	ret = clk_set_rate(ov2685->xvclk, OV2685_XVCLK_FREQ);
	if (ret < 0) {
	dev_err(dev, "Failed to set xvclk rate (24MHz)\n");
	return ret;
	}
	if (clk_get_rate(ov2685->xvclk) != OV2685_XVCLK_FREQ)
	dev_warn(dev, "xvclk mismatched, modes are based on 24MHz\n");

	ov2685->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
	if (IS_ERR(ov2685->reset_gpio)) {
	dev_err(dev, "Failed to get reset-gpios\n");
	return -EINVAL;
	}

	ret = ov2685_configure_regulators(ov2685);
	if (ret) {
	dev_err(dev, "Failed to get power regulators\n");
	return ret;
	}

	mutex_init(&ov2685->mutex);
	v4l2_i2c_subdev_init(&ov2685->subdev, client, &ov2685_subdev_ops);
	ret = ov2685_initialize_controls(ov2685);
	if (ret)
	goto err_destroy_mutex;

	ret = __ov2685_power_on(ov2685);
	if (ret)
	goto err_free_handler;

	ret = ov2685_check_sensor_id(ov2685, client);
	if (ret)
	goto err_power_off;

	#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
	ov2685->subdev.internal_ops = &ov2685_internal_ops;
	ov2685->subdev.flags \|= V4L2_SUBDEV_FL_HAS_DEVNODE;
	#endif
	#if defined(CONFIG_MEDIA_CONTROLLER)
	ov2685->pad.flags = MEDIA_PAD_FL_SOURCE;
	ov2685->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
	ret = media_entity_pads_init(&ov2685->subdev.entity, 1, &ov2685->pad);
	if (ret < 0)
	goto err_power_off;
	#endif

	ret = v4l2_async_register_subdev(&ov2685->subdev);
	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(&ov2685->subdev.entity);
	#endif
	err_power_off:
	__ov2685_power_off(ov2685);
	err_free_handler:
	v4l2_ctrl_handler_free(&ov2685->ctrl_handler);
	err_destroy_mutex:
	mutex_destroy(&ov2685->mutex);

	return ret;
	}

	static int ov2685_remove(struct i2c_client *client)
	{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct ov2685 *ov2685 = to_ov2685(sd);

	v4l2_async_unregister_subdev(sd);
	#if defined(CONFIG_MEDIA_CONTROLLER)
	media_entity_cleanup(&sd->entity);
	#endif
	v4l2_ctrl_handler_free(&ov2685->ctrl_handler);
	mutex_destroy(&ov2685->mutex);

	pm_runtime_disable(&client->dev);
	if (!pm_runtime_status_suspended(&client->dev))
	__ov2685_power_off(ov2685);
	pm_runtime_set_suspended(&client->dev);

	return 0;
	}

	#if IS_ENABLED(CONFIG_OF)
	static const struct of_device_id ov2685_of_match[] = {
	{ .compatible = "ovti,ov2685" },
	{},
	};
	MODULE_DEVICE_TABLE(of, ov2685_of_match);
	#endif

	static struct i2c_driver ov2685_i2c_driver = {
	.driver = {
	.name = "ov2685",
	.pm = &ov2685_pm_ops,
	.of_match_table = of_match_ptr(ov2685_of_match),
	},
	.probe = &ov2685_probe,
	.remove = &ov2685_remove,
	};

	module_i2c_driver(ov2685_i2c_driver);

	MODULE_DESCRIPTION("OmniVision ov2685 sensor driver");
	MODULE_LICENSE("GPL v2");