// SPDX-License-Identifier: GPL-2.0
/*
 * imx214.c - imx214 sensor driver
 *
 * Copyright 2018 Qtechnology A/S
 *
 * Ricardo Ribalda <ricardo.ribalda@gmail.com>
 */
#include <linux/clk.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/regmap.h>
#include <linux/regulator/consumer.h>
#include <media/media-entity.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-subdev.h>

#define IMX214_DEFAULT_CLK_FREQ	24000000
#define IMX214_DEFAULT_LINK_FREQ 480000000
#define IMX214_DEFAULT_PIXEL_RATE ((IMX214_DEFAULT_LINK_FREQ * 8LL) / 10)
#define IMX214_FPS 30
#define IMX214_MBUS_CODE MEDIA_BUS_FMT_SRGGB10_1X10

static const char * const imx214_supply_name[] = {
	"vdda",
	"vddd",
	"vdddo",
};

#define IMX214_NUM_SUPPLIES ARRAY_SIZE(imx214_supply_name)

struct imx214 {
	struct device *dev;
	struct clk *xclk;
	struct regmap *regmap;

	struct v4l2_subdev sd;
	struct media_pad pad;
	struct v4l2_mbus_framefmt fmt;
	struct v4l2_rect crop;

	struct v4l2_ctrl_handler ctrls;
	struct v4l2_ctrl *pixel_rate;
	struct v4l2_ctrl *link_freq;
	struct v4l2_ctrl *exposure;

	struct regulator_bulk_data	supplies[IMX214_NUM_SUPPLIES];

	struct gpio_desc *enable_gpio;

	/*
	 * Serialize control access, get/set format, get selection
	 * and start streaming.
	 */
	struct mutex mutex;

	bool streaming;
};

struct reg_8 {
	u16 addr;
	u8 val;
};

enum {
	IMX214_TABLE_WAIT_MS = 0,
	IMX214_TABLE_END,
	IMX214_MAX_RETRIES,
	IMX214_WAIT_MS
};

/*From imx214_mode_tbls.h*/
static const struct reg_8 mode_4096x2304[] = {
	{0x0114, 0x03},
	{0x0220, 0x00},
	{0x0221, 0x11},
	{0x0222, 0x01},
	{0x0340, 0x0C},
	{0x0341, 0x7A},
	{0x0342, 0x13},
	{0x0343, 0x90},
	{0x0344, 0x00},
	{0x0345, 0x38},
	{0x0346, 0x01},
	{0x0347, 0x98},
	{0x0348, 0x10},
	{0x0349, 0x37},
	{0x034A, 0x0A},
	{0x034B, 0x97},
	{0x0381, 0x01},
	{0x0383, 0x01},
	{0x0385, 0x01},
	{0x0387, 0x01},
	{0x0900, 0x00},
	{0x0901, 0x00},
	{0x0902, 0x00},
	{0x3000, 0x35},
	{0x3054, 0x01},
	{0x305C, 0x11},

	{0x0112, 0x0A},
	{0x0113, 0x0A},
	{0x034C, 0x10},
	{0x034D, 0x00},
	{0x034E, 0x09},
	{0x034F, 0x00},
	{0x0401, 0x00},
	{0x0404, 0x00},
	{0x0405, 0x10},
	{0x0408, 0x00},
	{0x0409, 0x00},
	{0x040A, 0x00},
	{0x040B, 0x00},
	{0x040C, 0x10},
	{0x040D, 0x00},
	{0x040E, 0x09},
	{0x040F, 0x00},

	{0x0301, 0x05},
	{0x0303, 0x02},
	{0x0305, 0x03},
	{0x0306, 0x00},
	{0x0307, 0x96},
	{0x0309, 0x0A},
	{0x030B, 0x01},
	{0x0310, 0x00},

	{0x0820, 0x12},
	{0x0821, 0xC0},
	{0x0822, 0x00},
	{0x0823, 0x00},

	{0x3A03, 0x09},
	{0x3A04, 0x50},
	{0x3A05, 0x01},

	{0x0B06, 0x01},
	{0x30A2, 0x00},

	{0x30B4, 0x00},

	{0x3A02, 0xFF},

	{0x3011, 0x00},
	{0x3013, 0x01},

	{0x0202, 0x0C},
	{0x0203, 0x70},
	{0x0224, 0x01},
	{0x0225, 0xF4},

	{0x0204, 0x00},
	{0x0205, 0x00},
	{0x020E, 0x01},
	{0x020F, 0x00},
	{0x0210, 0x01},
	{0x0211, 0x00},
	{0x0212, 0x01},
	{0x0213, 0x00},
	{0x0214, 0x01},
	{0x0215, 0x00},
	{0x0216, 0x00},
	{0x0217, 0x00},

	{0x4170, 0x00},
	{0x4171, 0x10},
	{0x4176, 0x00},
	{0x4177, 0x3C},
	{0xAE20, 0x04},
	{0xAE21, 0x5C},

	{IMX214_TABLE_WAIT_MS, 10},
	{0x0138, 0x01},
	{IMX214_TABLE_END, 0x00}
};

static const struct reg_8 mode_1920x1080[] = {
	{0x0114, 0x03},
	{0x0220, 0x00},
	{0x0221, 0x11},
	{0x0222, 0x01},
	{0x0340, 0x0C},
	{0x0341, 0x7A},
	{0x0342, 0x13},
	{0x0343, 0x90},
	{0x0344, 0x04},
	{0x0345, 0x78},
	{0x0346, 0x03},
	{0x0347, 0xFC},
	{0x0348, 0x0B},
	{0x0349, 0xF7},
	{0x034A, 0x08},
	{0x034B, 0x33},
	{0x0381, 0x01},
	{0x0383, 0x01},
	{0x0385, 0x01},
	{0x0387, 0x01},
	{0x0900, 0x00},
	{0x0901, 0x00},
	{0x0902, 0x00},
	{0x3000, 0x35},
	{0x3054, 0x01},
	{0x305C, 0x11},

	{0x0112, 0x0A},
	{0x0113, 0x0A},
	{0x034C, 0x07},
	{0x034D, 0x80},
	{0x034E, 0x04},
	{0x034F, 0x38},
	{0x0401, 0x00},
	{0x0404, 0x00},
	{0x0405, 0x10},
	{0x0408, 0x00},
	{0x0409, 0x00},
	{0x040A, 0x00},
	{0x040B, 0x00},
	{0x040C, 0x07},
	{0x040D, 0x80},
	{0x040E, 0x04},
	{0x040F, 0x38},

	{0x0301, 0x05},
	{0x0303, 0x02},
	{0x0305, 0x03},
	{0x0306, 0x00},
	{0x0307, 0x96},
	{0x0309, 0x0A},
	{0x030B, 0x01},
	{0x0310, 0x00},

	{0x0820, 0x12},
	{0x0821, 0xC0},
	{0x0822, 0x00},
	{0x0823, 0x00},

	{0x3A03, 0x04},
	{0x3A04, 0xF8},
	{0x3A05, 0x02},

	{0x0B06, 0x01},
	{0x30A2, 0x00},

	{0x30B4, 0x00},

	{0x3A02, 0xFF},

	{0x3011, 0x00},
	{0x3013, 0x01},

	{0x0202, 0x0C},
	{0x0203, 0x70},
	{0x0224, 0x01},
	{0x0225, 0xF4},

	{0x0204, 0x00},
	{0x0205, 0x00},
	{0x020E, 0x01},
	{0x020F, 0x00},
	{0x0210, 0x01},
	{0x0211, 0x00},
	{0x0212, 0x01},
	{0x0213, 0x00},
	{0x0214, 0x01},
	{0x0215, 0x00},
	{0x0216, 0x00},
	{0x0217, 0x00},

	{0x4170, 0x00},
	{0x4171, 0x10},
	{0x4176, 0x00},
	{0x4177, 0x3C},
	{0xAE20, 0x04},
	{0xAE21, 0x5C},

	{IMX214_TABLE_WAIT_MS, 10},
	{0x0138, 0x01},
	{IMX214_TABLE_END, 0x00}
};

static const struct reg_8 mode_table_common[] = {
	/* software reset */

	/* software standby settings */
	{0x0100, 0x00},

	/* ATR setting */
	{0x9300, 0x02},

	/* external clock setting */
	{0x0136, 0x18},
	{0x0137, 0x00},

	/* global setting */
	/* basic config */
	{0x0101, 0x00},
	{0x0105, 0x01},
	{0x0106, 0x01},
	{0x4550, 0x02},
	{0x4601, 0x00},
	{0x4642, 0x05},
	{0x6227, 0x11},
	{0x6276, 0x00},
	{0x900E, 0x06},
	{0xA802, 0x90},
	{0xA803, 0x11},
	{0xA804, 0x62},
	{0xA805, 0x77},
	{0xA806, 0xAE},
	{0xA807, 0x34},
	{0xA808, 0xAE},
	{0xA809, 0x35},
	{0xA80A, 0x62},
	{0xA80B, 0x83},
	{0xAE33, 0x00},

	/* analog setting */
	{0x4174, 0x00},
	{0x4175, 0x11},
	{0x4612, 0x29},
	{0x461B, 0x12},
	{0x461F, 0x06},
	{0x4635, 0x07},
	{0x4637, 0x30},
	{0x463F, 0x18},
	{0x4641, 0x0D},
	{0x465B, 0x12},
	{0x465F, 0x11},
	{0x4663, 0x11},
	{0x4667, 0x0F},
	{0x466F, 0x0F},
	{0x470E, 0x09},
	{0x4909, 0xAB},
	{0x490B, 0x95},
	{0x4915, 0x5D},
	{0x4A5F, 0xFF},
	{0x4A61, 0xFF},
	{0x4A73, 0x62},
	{0x4A85, 0x00},
	{0x4A87, 0xFF},

	/* embedded data */
	{0x5041, 0x04},
	{0x583C, 0x04},
	{0x620E, 0x04},
	{0x6EB2, 0x01},
	{0x6EB3, 0x00},
	{0x9300, 0x02},

	/* imagequality */
	/* HDR setting */
	{0x3001, 0x07},
	{0x6D12, 0x3F},
	{0x6D13, 0xFF},
	{0x9344, 0x03},
	{0x9706, 0x10},
	{0x9707, 0x03},
	{0x9708, 0x03},
	{0x9E04, 0x01},
	{0x9E05, 0x00},
	{0x9E0C, 0x01},
	{0x9E0D, 0x02},
	{0x9E24, 0x00},
	{0x9E25, 0x8C},
	{0x9E26, 0x00},
	{0x9E27, 0x94},
	{0x9E28, 0x00},
	{0x9E29, 0x96},

	/* CNR parameter setting */
	{0x69DB, 0x01},

	/* Moire reduction */
	{0x6957, 0x01},

	/* image enhancement */
	{0x6987, 0x17},
	{0x698A, 0x03},
	{0x698B, 0x03},

	/* white balanace */
	{0x0B8E, 0x01},
	{0x0B8F, 0x00},
	{0x0B90, 0x01},
	{0x0B91, 0x00},
	{0x0B92, 0x01},
	{0x0B93, 0x00},
	{0x0B94, 0x01},
	{0x0B95, 0x00},

	/* ATR setting */
	{0x6E50, 0x00},
	{0x6E51, 0x32},
	{0x9340, 0x00},
	{0x9341, 0x3C},
	{0x9342, 0x03},
	{0x9343, 0xFF},
	{IMX214_TABLE_END, 0x00}
};

/*
 * Declare modes in order, from biggest
 * to smallest height.
 */
static const struct imx214_mode {
	u32 width;
	u32 height;
	const struct reg_8 *reg_table;
} imx214_modes[] = {
	{
		.width = 4096,
		.height = 2304,
		.reg_table = mode_4096x2304,
	},
	{
		.width = 1920,
		.height = 1080,
		.reg_table = mode_1920x1080,
	},
};

static inline struct imx214 *to_imx214(struct v4l2_subdev *sd)
{
	return container_of(sd, struct imx214, sd);
}

static int __maybe_unused imx214_power_on(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct imx214 *imx214 = to_imx214(sd);
	int ret;

	ret = regulator_bulk_enable(IMX214_NUM_SUPPLIES, imx214->supplies);
	if (ret < 0) {
		dev_err(imx214->dev, "failed to enable regulators: %d\n", ret);
		return ret;
	}

	usleep_range(2000, 3000);

	ret = clk_prepare_enable(imx214->xclk);
	if (ret < 0) {
		regulator_bulk_disable(IMX214_NUM_SUPPLIES, imx214->supplies);
		dev_err(imx214->dev, "clk prepare enable failed\n");
		return ret;
	}

	gpiod_set_value_cansleep(imx214->enable_gpio, 1);
	usleep_range(12000, 15000);

	return 0;
}

static int __maybe_unused imx214_power_off(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct imx214 *imx214 = to_imx214(sd);

	gpiod_set_value_cansleep(imx214->enable_gpio, 0);

	clk_disable_unprepare(imx214->xclk);

	regulator_bulk_disable(IMX214_NUM_SUPPLIES, imx214->supplies);
	usleep_range(10, 20);

	return 0;
}

static int imx214_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 = IMX214_MBUS_CODE;

	return 0;
}

static int imx214_enum_frame_size(struct v4l2_subdev *subdev,
				  struct v4l2_subdev_pad_config *cfg,
				  struct v4l2_subdev_frame_size_enum *fse)
{
	if (fse->code != IMX214_MBUS_CODE)
		return -EINVAL;

	if (fse->index >= ARRAY_SIZE(imx214_modes))
		return -EINVAL;

	fse->min_width = fse->max_width = imx214_modes[fse->index].width;
	fse->min_height = fse->max_height = imx214_modes[fse->index].height;

	return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int imx214_s_register(struct v4l2_subdev *subdev,
			     const struct v4l2_dbg_register *reg)
{
	struct imx214 *imx214 = container_of(subdev, struct imx214, sd);

	return regmap_write(imx214->regmap, reg->reg, reg->val);
}

static int imx214_g_register(struct v4l2_subdev *subdev,
			     struct v4l2_dbg_register *reg)
{
	struct imx214 *imx214 = container_of(subdev, struct imx214, sd);
	unsigned int aux;
	int ret;

	reg->size = 1;
	ret = regmap_read(imx214->regmap, reg->reg, &aux);
	reg->val = aux;

	return ret;
}
#endif

static const struct v4l2_subdev_core_ops imx214_core_ops = {
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.g_register = imx214_g_register,
	.s_register = imx214_s_register,
#endif
};

static struct v4l2_mbus_framefmt *
__imx214_get_pad_format(struct imx214 *imx214,
			struct v4l2_subdev_pad_config *cfg,
			unsigned int pad,
			enum v4l2_subdev_format_whence which)
{
	switch (which) {
	case V4L2_SUBDEV_FORMAT_TRY:
		return v4l2_subdev_get_try_format(&imx214->sd, cfg, pad);
	case V4L2_SUBDEV_FORMAT_ACTIVE:
		return &imx214->fmt;
	default:
		return NULL;
	}
}

static int imx214_get_format(struct v4l2_subdev *sd,
			     struct v4l2_subdev_pad_config *cfg,
			     struct v4l2_subdev_format *format)
{
	struct imx214 *imx214 = to_imx214(sd);

	mutex_lock(&imx214->mutex);
	format->format = *__imx214_get_pad_format(imx214, cfg, format->pad,
						  format->which);
	mutex_unlock(&imx214->mutex);

	return 0;
}

static struct v4l2_rect *
__imx214_get_pad_crop(struct imx214 *imx214, struct v4l2_subdev_pad_config *cfg,
		      unsigned int pad, enum v4l2_subdev_format_whence which)
{
	switch (which) {
	case V4L2_SUBDEV_FORMAT_TRY:
		return v4l2_subdev_get_try_crop(&imx214->sd, cfg, pad);
	case V4L2_SUBDEV_FORMAT_ACTIVE:
		return &imx214->crop;
	default:
		return NULL;
	}
}

static int imx214_set_format(struct v4l2_subdev *sd,
			     struct v4l2_subdev_pad_config *cfg,
			     struct v4l2_subdev_format *format)
{
	struct imx214 *imx214 = to_imx214(sd);
	struct v4l2_mbus_framefmt *__format;
	struct v4l2_rect *__crop;
	const struct imx214_mode *mode;

	mutex_lock(&imx214->mutex);

	__crop = __imx214_get_pad_crop(imx214, cfg, format->pad, format->which);

	mode = v4l2_find_nearest_size(imx214_modes,
				      ARRAY_SIZE(imx214_modes), width, height,
				      format->format.width,
				      format->format.height);

	__crop->width = mode->width;
	__crop->height = mode->height;

	__format = __imx214_get_pad_format(imx214, cfg, format->pad,
					   format->which);
	__format->width = __crop->width;
	__format->height = __crop->height;
	__format->code = IMX214_MBUS_CODE;
	__format->field = V4L2_FIELD_NONE;
	__format->colorspace = V4L2_COLORSPACE_SRGB;
	__format->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(__format->colorspace);
	__format->quantization = V4L2_MAP_QUANTIZATION_DEFAULT(true,
				__format->colorspace, __format->ycbcr_enc);
	__format->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(__format->colorspace);

	format->format = *__format;

	mutex_unlock(&imx214->mutex);

	return 0;
}

static int imx214_get_selection(struct v4l2_subdev *sd,
				struct v4l2_subdev_pad_config *cfg,
				struct v4l2_subdev_selection *sel)
{
	struct imx214 *imx214 = to_imx214(sd);

	if (sel->target != V4L2_SEL_TGT_CROP)
		return -EINVAL;

	mutex_lock(&imx214->mutex);
	sel->r = *__imx214_get_pad_crop(imx214, cfg, sel->pad,
					sel->which);
	mutex_unlock(&imx214->mutex);
	return 0;
}

static int imx214_entity_init_cfg(struct v4l2_subdev *subdev,
				  struct v4l2_subdev_pad_config *cfg)
{
	struct v4l2_subdev_format fmt = { };

	fmt.which = cfg ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
	fmt.format.width = imx214_modes[0].width;
	fmt.format.height = imx214_modes[0].height;

	imx214_set_format(subdev, cfg, &fmt);

	return 0;
}

static int imx214_set_ctrl(struct v4l2_ctrl *ctrl)
{
	struct imx214 *imx214 = container_of(ctrl->handler,
					     struct imx214, ctrls);
	u8 vals[2];
	int ret;

	/*
	 * Applying V4L2 control value only happens
	 * when power is up for streaming
	 */
	if (!pm_runtime_get_if_in_use(imx214->dev))
		return 0;

	switch (ctrl->id) {
	case V4L2_CID_EXPOSURE:
		vals[1] = ctrl->val;
		vals[0] = ctrl->val >> 8;
		ret = regmap_bulk_write(imx214->regmap, 0x202, vals, 2);
		if (ret < 0)
			dev_err(imx214->dev, "Error %d\n", ret);
		ret = 0;
		break;

	default:
		ret = -EINVAL;
	}

	pm_runtime_put(imx214->dev);

	return ret;
}

static const struct v4l2_ctrl_ops imx214_ctrl_ops = {
	.s_ctrl = imx214_set_ctrl,
};

#define MAX_CMD 4
static int imx214_write_table(struct imx214 *imx214,
			      const struct reg_8 table[])
{
	u8 vals[MAX_CMD];
	int i;
	int ret;

	for (; table->addr != IMX214_TABLE_END ; table++) {
		if (table->addr == IMX214_TABLE_WAIT_MS) {
			usleep_range(table->val * 1000,
				     table->val * 1000 + 500);
			continue;
		}

		for (i = 0; i < MAX_CMD; i++) {
			if (table[i].addr != (table[0].addr + i))
				break;
			vals[i] = table[i].val;
		}

		ret = regmap_bulk_write(imx214->regmap, table->addr, vals, i);

		if (ret) {
			dev_err(imx214->dev, "write_table error: %d\n", ret);
			return ret;
		}

		table += i - 1;
	}

	return 0;
}

static int imx214_start_streaming(struct imx214 *imx214)
{
	const struct imx214_mode *mode;
	int ret;

	mutex_lock(&imx214->mutex);
	ret = imx214_write_table(imx214, mode_table_common);
	if (ret < 0) {
		dev_err(imx214->dev, "could not sent common table %d\n", ret);
		goto error;
	}

	mode = v4l2_find_nearest_size(imx214_modes,
				ARRAY_SIZE(imx214_modes), width, height,
				imx214->fmt.width, imx214->fmt.height);
	ret = imx214_write_table(imx214, mode->reg_table);
	if (ret < 0) {
		dev_err(imx214->dev, "could not sent mode table %d\n", ret);
		goto error;
	}
	ret = __v4l2_ctrl_handler_setup(&imx214->ctrls);
	if (ret < 0) {
		dev_err(imx214->dev, "could not sync v4l2 controls\n");
		goto error;
	}
	ret = regmap_write(imx214->regmap, 0x100, 1);
	if (ret < 0) {
		dev_err(imx214->dev, "could not sent start table %d\n", ret);
		goto error;
	}

	mutex_unlock(&imx214->mutex);
	return 0;

error:
	mutex_unlock(&imx214->mutex);
	return ret;
}

static int imx214_stop_streaming(struct imx214 *imx214)
{
	int ret;

	ret = regmap_write(imx214->regmap, 0x100, 0);
	if (ret < 0)
		dev_err(imx214->dev, "could not sent stop table %d\n",	ret);

	return ret;
}

static int imx214_s_stream(struct v4l2_subdev *subdev, int enable)
{
	struct imx214 *imx214 = to_imx214(subdev);
	int ret;

	if (imx214->streaming == enable)
		return 0;

	if (enable) {
		ret = pm_runtime_get_sync(imx214->dev);
		if (ret < 0) {
			pm_runtime_put_noidle(imx214->dev);
			return ret;
		}

		ret = imx214_start_streaming(imx214);
		if (ret < 0)
			goto err_rpm_put;
	} else {
		ret = imx214_start_streaming(imx214);
		if (ret < 0)
			goto err_rpm_put;
		pm_runtime_put(imx214->dev);
	}

	imx214->streaming = enable;
	return 0;

err_rpm_put:
	pm_runtime_put(imx214->dev);
	return ret;
}

static int imx214_g_frame_interval(struct v4l2_subdev *subdev,
				   struct v4l2_subdev_frame_interval *fival)
{
	fival->pad = 0;
	fival->interval.numerator = 1;
	fival->interval.denominator = IMX214_FPS;

	return 0;
}

static int imx214_enum_frame_interval(struct v4l2_subdev *subdev,
				struct v4l2_subdev_pad_config *cfg,
				struct v4l2_subdev_frame_interval_enum *fie)
{
	const struct imx214_mode *mode;

	if (fie->index != 0)
		return -EINVAL;

	mode = v4l2_find_nearest_size(imx214_modes,
				ARRAY_SIZE(imx214_modes), width, height,
				fie->width, fie->height);

	fie->code = IMX214_MBUS_CODE;
	fie->width = mode->width;
	fie->height = mode->height;
	fie->interval.numerator = 1;
	fie->interval.denominator = IMX214_FPS;

	return 0;
}

static const struct v4l2_subdev_video_ops imx214_video_ops = {
	.s_stream = imx214_s_stream,
	.g_frame_interval = imx214_g_frame_interval,
	.s_frame_interval = imx214_g_frame_interval,
};

static const struct v4l2_subdev_pad_ops imx214_subdev_pad_ops = {
	.enum_mbus_code = imx214_enum_mbus_code,
	.enum_frame_size = imx214_enum_frame_size,
	.enum_frame_interval = imx214_enum_frame_interval,
	.get_fmt = imx214_get_format,
	.set_fmt = imx214_set_format,
	.get_selection = imx214_get_selection,
	.init_cfg = imx214_entity_init_cfg,
};

static const struct v4l2_subdev_ops imx214_subdev_ops = {
	.core = &imx214_core_ops,
	.video = &imx214_video_ops,
	.pad = &imx214_subdev_pad_ops,
};

static const struct regmap_config sensor_regmap_config = {
	.reg_bits = 16,
	.val_bits = 8,
	.cache_type = REGCACHE_RBTREE,
};

static int imx214_get_regulators(struct device *dev, struct imx214 *imx214)
{
	unsigned int i;

	for (i = 0; i < IMX214_NUM_SUPPLIES; i++)
		imx214->supplies[i].supply = imx214_supply_name[i];

	return devm_regulator_bulk_get(dev, IMX214_NUM_SUPPLIES,
				       imx214->supplies);
}

static int imx214_parse_fwnode(struct device *dev)
{
	struct fwnode_handle *endpoint;
	struct v4l2_fwnode_endpoint bus_cfg = {
		.bus_type = V4L2_MBUS_CSI2_DPHY,
	};
	unsigned int i;
	int ret;

	endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
	if (!endpoint) {
		dev_err(dev, "endpoint node not found\n");
		return -EINVAL;
	}

	ret = v4l2_fwnode_endpoint_alloc_parse(endpoint, &bus_cfg);
	if (ret) {
		dev_err(dev, "parsing endpoint node failed\n");
		goto done;
	}

	for (i = 0; i < bus_cfg.nr_of_link_frequencies; i++)
		if (bus_cfg.link_frequencies[i] == IMX214_DEFAULT_LINK_FREQ)
			break;

	if (i == bus_cfg.nr_of_link_frequencies) {
		dev_err(dev, "link-frequencies %d not supported, Please review your DT\n",
			IMX214_DEFAULT_LINK_FREQ);
		ret = -EINVAL;
		goto done;
	}

done:
	v4l2_fwnode_endpoint_free(&bus_cfg);
	fwnode_handle_put(endpoint);
	return ret;
}

static int __maybe_unused imx214_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct imx214 *imx214 = to_imx214(sd);

	if (imx214->streaming)
		imx214_stop_streaming(imx214);

	return 0;
}

static int __maybe_unused imx214_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct imx214 *imx214 = to_imx214(sd);
	int ret;

	if (imx214->streaming) {
		ret = imx214_start_streaming(imx214);
		if (ret)
			goto error;
	}

	return 0;

error:
	imx214_stop_streaming(imx214);
	imx214->streaming = 0;
	return ret;
}

static int imx214_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct imx214 *imx214;
	static const s64 link_freq[] = {
		IMX214_DEFAULT_LINK_FREQ,
	};
	int ret;

	ret = imx214_parse_fwnode(dev);
	if (ret)
		return ret;

	imx214 = devm_kzalloc(dev, sizeof(*imx214), GFP_KERNEL);
	if (!imx214)
		return -ENOMEM;

	imx214->dev = dev;

	imx214->xclk = devm_clk_get(dev, NULL);
	if (IS_ERR(imx214->xclk)) {
		dev_err(dev, "could not get xclk");
		return PTR_ERR(imx214->xclk);
	}

	ret = clk_set_rate(imx214->xclk, IMX214_DEFAULT_CLK_FREQ);
	if (ret) {
		dev_err(dev, "could not set xclk frequency\n");
		return ret;
	}

	ret = imx214_get_regulators(dev, imx214);
	if (ret < 0) {
		dev_err(dev, "cannot get regulators\n");
		return ret;
	}

	imx214->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
	if (IS_ERR(imx214->enable_gpio)) {
		dev_err(dev, "cannot get enable gpio\n");
		return PTR_ERR(imx214->enable_gpio);
	}

	imx214->regmap = devm_regmap_init_i2c(client, &sensor_regmap_config);
	if (IS_ERR(imx214->regmap)) {
		dev_err(dev, "regmap init failed\n");
		return PTR_ERR(imx214->regmap);
	}

	v4l2_i2c_subdev_init(&imx214->sd, client, &imx214_subdev_ops);

	/*
	 * Enable power initially, to avoid warnings
	 * from clk_disable on power_off
	 */
	imx214_power_on(imx214->dev);

	pm_runtime_set_active(imx214->dev);
	pm_runtime_enable(imx214->dev);
	pm_runtime_idle(imx214->dev);

	v4l2_ctrl_handler_init(&imx214->ctrls, 3);

	imx214->pixel_rate = v4l2_ctrl_new_std(&imx214->ctrls, NULL,
					       V4L2_CID_PIXEL_RATE, 0,
					       IMX214_DEFAULT_PIXEL_RATE, 1,
					       IMX214_DEFAULT_PIXEL_RATE);
	imx214->link_freq = v4l2_ctrl_new_int_menu(&imx214->ctrls, NULL,
						   V4L2_CID_LINK_FREQ,
						   ARRAY_SIZE(link_freq) - 1,
						   0, link_freq);
	if (imx214->link_freq)
		imx214->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	/*
	 * WARNING!
	 * Values obtained reverse engineering blobs and/or devices.
	 * Ranges and functionality might be wrong.
	 *
	 * Sony, please release some register set documentation for the
	 * device.
	 *
	 * Yours sincerely, Ricardo.
	 */
	imx214->exposure = v4l2_ctrl_new_std(&imx214->ctrls, &imx214_ctrl_ops,
					     V4L2_CID_EXPOSURE,
					     0, 3184, 1, 0x0c70);

	ret = imx214->ctrls.error;
	if (ret) {
		dev_err(&client->dev, "%s control init failed (%d)\n",
			__func__, ret);
		goto free_ctrl;
	}

	imx214->sd.ctrl_handler = &imx214->ctrls;
	mutex_init(&imx214->mutex);
	imx214->ctrls.lock = &imx214->mutex;

	imx214->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
	imx214->pad.flags = MEDIA_PAD_FL_SOURCE;
	imx214->sd.dev = &client->dev;
	imx214->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;

	ret = media_entity_pads_init(&imx214->sd.entity, 1, &imx214->pad);
	if (ret < 0) {
		dev_err(dev, "could not register media entity\n");
		goto free_ctrl;
	}

	imx214_entity_init_cfg(&imx214->sd, NULL);

	ret = v4l2_async_register_subdev_sensor_common(&imx214->sd);
	if (ret < 0) {
		dev_err(dev, "could not register v4l2 device\n");
		goto free_entity;
	}

	return 0;

free_entity:
	media_entity_cleanup(&imx214->sd.entity);
free_ctrl:
	mutex_destroy(&imx214->mutex);
	v4l2_ctrl_handler_free(&imx214->ctrls);
	pm_runtime_disable(imx214->dev);

	return ret;
}

static int imx214_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct imx214 *imx214 = to_imx214(sd);

	v4l2_async_unregister_subdev(&imx214->sd);
	media_entity_cleanup(&imx214->sd.entity);
	v4l2_ctrl_handler_free(&imx214->ctrls);

	pm_runtime_disable(&client->dev);
	pm_runtime_set_suspended(&client->dev);

	mutex_destroy(&imx214->mutex);

	return 0;
}

static const struct of_device_id imx214_of_match[] = {
	{ .compatible = "sony,imx214" },
	{ }
};
MODULE_DEVICE_TABLE(of, imx214_of_match);

static const struct dev_pm_ops imx214_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(imx214_suspend, imx214_resume)
	SET_RUNTIME_PM_OPS(imx214_power_off, imx214_power_on, NULL)
};

static struct i2c_driver imx214_i2c_driver = {
	.driver = {
		.of_match_table = imx214_of_match,
		.pm = &imx214_pm_ops,
		.name  = "imx214",
	},
	.probe_new  = imx214_probe,
	.remove = imx214_remove,
};

module_i2c_driver(imx214_i2c_driver);

MODULE_DESCRIPTION("Sony IMX214 Camera driver");
MODULE_AUTHOR("Ricardo Ribalda <ricardo.ribalda@gmail.com>");
MODULE_LICENSE("GPL v2"