media: i2c: Add the ov7740 image sensor driver

The ov7740 (color) image sensor is a high performance VGA CMOS
image snesor, which supports for output formats: RAW RGB and YUV
and image sizes: VGA, and QVGA, CIF and any size smaller.

Signed-off-by: Songjun Wu <songjun.wu@microchip.com>
Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

3 files changed, 1225 insertions, 0 deletions

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index db4ed9b9df4c..9f18cd296841 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -665,6 +665,14 @@ config VIDEO_OV7670
 	  OV7670 VGA camera.  It currently only works with the M88ALP01
 	  controller.
 
+config VIDEO_OV7740
+	tristate "OmniVision OV7740 sensor support"
+	depends on I2C && VIDEO_V4L2
+	depends on MEDIA_CAMERA_SUPPORT
+	---help---
+	  This is a Video4Linux2 sensor-level driver for the OmniVision
+	  OV7740 VGA camera sensor.
+
 config VIDEO_OV9650
 	tristate "OmniVision OV9650/OV9652 sensor support"
 	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index b1b5dfdba3e5..c0f94cd8d56d 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -68,6 +68,7 @@ obj-$(CONFIG_VIDEO_OV5670) += ov5670.o
 obj-$(CONFIG_VIDEO_OV6650) += ov6650.o
 obj-$(CONFIG_VIDEO_OV7640) += ov7640.o
 obj-$(CONFIG_VIDEO_OV7670) += ov7670.o
+obj-$(CONFIG_VIDEO_OV7740) += ov7740.o
 obj-$(CONFIG_VIDEO_OV9650) += ov9650.o
 obj-$(CONFIG_VIDEO_OV13858) += ov13858.o
 obj-$(CONFIG_VIDEO_MT9M032) += mt9m032.o
diff --git a/drivers/media/i2c/ov7740.c b/drivers/media/i2c/ov7740.c
new file mode 100644
index 000000000000..0308ba437bbb
--- /dev/null
+++ b/drivers/media/i2c/ov7740.c
@@ -0,0 +1,1216 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2017 Microchip Corporation.
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-image-sizes.h>
+#include <media/v4l2-subdev.h>
+
+#define REG_OUTSIZE_LSB 0x34
+
+/* OV7740 register tables */
+#define REG_GAIN	0x00	/* Gain lower 8 bits (rest in vref) */
+#define REG_BGAIN	0x01	/* blue gain */
+#define REG_RGAIN	0x02	/* red gain */
+#define REG_GGAIN	0x03	/* green gain */
+#define REG_REG04	0x04	/* analog setting, dont change*/
+#define REG_BAVG	0x05	/* b channel average */
+#define REG_GAVG	0x06	/* g channel average */
+#define REG_RAVG	0x07	/* r channel average */
+
+#define REG_REG0C	0x0C	/* filp enable */
+#define REG0C_IMG_FLIP		0x80
+#define REG0C_IMG_MIRROR	0x40
+
+#define REG_REG0E	0x0E	/* blc line */
+#define REG_HAEC	0x0F	/* auto exposure cntrl */
+#define REG_AEC		0x10	/* auto exposure cntrl */
+
+#define REG_CLK		0x11	/* Clock control */
+#define REG_REG55	0x55	/* Clock PLL DIV/PreDiv */
+
+#define REG_REG12	0x12
+
+#define REG_REG13	0x13	/* auto/manual AGC, AEC, Write Balance*/
+#define REG13_AEC_EN	0x01
+#define REG13_AGC_EN	0x04
+
+#define REG_REG14	0x14
+#define REG_CTRL15	0x15
+#define REG15_GAIN_MSB	0x03
+
+#define REG_REG16	0x16
+
+#define REG_MIDH	0x1C	/* manufacture id byte */
+#define REG_MIDL	0x1D	/* manufacture id byre */
+#define REG_PIDH	0x0A	/* Product ID MSB */
+#define REG_PIDL	0x0B	/* Product ID LSB */
+
+#define REG_84		0x84	/* lots of stuff */
+#define REG_REG38	0x38	/* sub-addr */
+
+#define REG_AHSTART	0x17	/* Horiz start high bits */
+#define REG_AHSIZE	0x18
+#define REG_AVSTART	0x19	/* Vert start high bits */
+#define REG_AVSIZE	0x1A
+#define REG_PSHFT	0x1b	/* Pixel delay after HREF */
+
+#define REG_HOUTSIZE	0x31
+#define REG_VOUTSIZE	0x32
+#define REG_HVSIZEOFF	0x33
+#define REG_REG34	0x34	/* DSP output size H/V LSB*/
+
+#define REG_ISP_CTRL00	0x80
+#define ISPCTRL00_AWB_EN	0x10
+#define ISPCTRL00_AWB_GAIN_EN	0x04
+
+#define	REG_YGAIN	0xE2	/* ygain for contrast control */
+
+#define	REG_YBRIGHT	  0xE3
+#define	REG_SGNSET	  0xE4
+#define	SGNSET_YBRIGHT_MASK	  0x08
+
+#define REG_USAT	0xDD
+#define REG_VSAT	0xDE
+
+
+struct ov7740 {
+	struct v4l2_subdev subdev;
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	struct media_pad pad;
+#endif
+	struct v4l2_mbus_framefmt format;
+	const struct ov7740_pixfmt *fmt;  /* Current format */
+	const struct ov7740_framesize *frmsize;
+	struct regmap *regmap;
+	struct clk *xvclk;
+	struct v4l2_ctrl_handler ctrl_handler;
+	struct {
+		/* gain cluster */
+		struct v4l2_ctrl *auto_gain;
+		struct v4l2_ctrl *gain;
+	};
+	struct {
+		struct v4l2_ctrl *auto_wb;
+		struct v4l2_ctrl *blue_balance;
+		struct v4l2_ctrl *red_balance;
+	};
+	struct {
+		struct v4l2_ctrl *hflip;
+		struct v4l2_ctrl *vflip;
+	};
+	struct {
+		/* exposure cluster */
+		struct v4l2_ctrl *auto_exposure;
+		struct v4l2_ctrl *exposure;
+	};
+	struct {
+		/* saturation/hue cluster */
+		struct v4l2_ctrl *saturation;
+		struct v4l2_ctrl *hue;
+	};
+	struct v4l2_ctrl *brightness;
+	struct v4l2_ctrl *contrast;
+
+	struct mutex mutex;	/* To serialize asynchronus callbacks */
+	bool streaming;		/* Streaming on/off */
+
+	struct gpio_desc *resetb_gpio;
+	struct gpio_desc *pwdn_gpio;
+};
+
+struct ov7740_pixfmt {
+	u32 mbus_code;
+	enum v4l2_colorspace colorspace;
+	const struct reg_sequence *regs;
+	u32 reg_num;
+};
+
+struct ov7740_framesize {
+	u16 width;
+	u16 height;
+	const struct reg_sequence *regs;
+	u32 reg_num;
+};
+
+static const struct reg_sequence ov7740_vga[] = {
+	{0x55, 0x40},
+	{0x11, 0x02},
+
+	{0xd5, 0x10},
+	{0x0c, 0x12},
+	{0x0d, 0x34},
+	{0x17, 0x25},
+	{0x18, 0xa0},
+	{0x19, 0x03},
+	{0x1a, 0xf0},
+	{0x1b, 0x89},
+	{0x22, 0x03},
+	{0x29, 0x18},
+	{0x2b, 0xf8},
+	{0x2c, 0x01},
+	{REG_HOUTSIZE, 0xa0},
+	{REG_VOUTSIZE, 0xf0},
+	{0x33, 0xc4},
+	{REG_OUTSIZE_LSB, 0x0},
+	{0x35, 0x05},
+	{0x04, 0x60},
+	{0x27, 0x80},
+	{0x3d, 0x0f},
+	{0x3e, 0x80},
+	{0x3f, 0x40},
+	{0x40, 0x7f},
+	{0x41, 0x6a},
+	{0x42, 0x29},
+	{0x44, 0x22},
+	{0x45, 0x41},
+	{0x47, 0x02},
+	{0x49, 0x64},
+	{0x4a, 0xa1},
+	{0x4b, 0x40},
+	{0x4c, 0x1a},
+	{0x4d, 0x50},
+	{0x4e, 0x13},
+	{0x64, 0x00},
+	{0x67, 0x88},
+	{0x68, 0x1a},
+
+	{0x14, 0x28},
+	{0x24, 0x3c},
+	{0x25, 0x30},
+	{0x26, 0x72},
+	{0x50, 0x97},
+	{0x51, 0x1f},
+	{0x52, 0x00},
+	{0x53, 0x00},
+	{0x20, 0x00},
+	{0x21, 0xcf},
+	{0x50, 0x4b},
+	{0x38, 0x14},
+	{0xe9, 0x00},
+	{0x56, 0x55},
+	{0x57, 0xff},
+	{0x58, 0xff},
+	{0x59, 0xff},
+	{0x5f, 0x04},
+	{0xec, 0x00},
+	{0x13, 0xff},
+
+	{0x81, 0x3f},
+	{0x82, 0x32},
+	{0x38, 0x11},
+	{0x84, 0x70},
+	{0x85, 0x00},
+	{0x86, 0x03},
+	{0x87, 0x01},
+	{0x88, 0x05},
+	{0x89, 0x30},
+	{0x8d, 0x30},
+	{0x8f, 0x85},
+	{0x93, 0x30},
+	{0x95, 0x85},
+	{0x99, 0x30},
+	{0x9b, 0x85},
+
+	{0x9c, 0x08},
+	{0x9d, 0x12},
+	{0x9e, 0x23},
+	{0x9f, 0x45},
+	{0xa0, 0x55},
+	{0xa1, 0x64},
+	{0xa2, 0x72},
+	{0xa3, 0x7f},
+	{0xa4, 0x8b},
+	{0xa5, 0x95},
+	{0xa6, 0xa7},
+	{0xa7, 0xb5},
+	{0xa8, 0xcb},
+	{0xa9, 0xdd},
+	{0xaa, 0xec},
+	{0xab, 0x1a},
+
+	{0xce, 0x78},
+	{0xcf, 0x6e},
+	{0xd0, 0x0a},
+	{0xd1, 0x0c},
+	{0xd2, 0x84},
+	{0xd3, 0x90},
+	{0xd4, 0x1e},
+
+	{0x5a, 0x24},
+	{0x5b, 0x1f},
+	{0x5c, 0x88},
+	{0x5d, 0x60},
+
+	{0xac, 0x6e},
+	{0xbe, 0xff},
+	{0xbf, 0x00},
+
+	{0x0f, 0x1d},
+	{0x0f, 0x1f},
+};
+
+static const struct ov7740_framesize ov7740_framesizes[] = {
+	{
+		.width		= VGA_WIDTH,
+		.height		= VGA_HEIGHT,
+		.regs		= ov7740_vga,
+		.reg_num	= ARRAY_SIZE(ov7740_vga),
+	},
+};
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int ov7740_get_register(struct v4l2_subdev *sd,
+			       struct v4l2_dbg_register *reg)
+{
+	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
+	struct regmap *regmap = ov7740->regmap;
+	unsigned int val = 0;
+	int ret;
+
+	ret = regmap_read(regmap, reg->reg & 0xff, &val);
+	reg->val = val;
+	reg->size = 1;
+
+	return 0;
+}
+
+static int ov7740_set_register(struct v4l2_subdev *sd,
+			       const struct v4l2_dbg_register *reg)
+{
+	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
+	struct regmap *regmap = ov7740->regmap;
+
+	regmap_write(regmap, reg->reg & 0xff, reg->val & 0xff);
+
+	return 0;
+}
+#endif
+
+static int ov7740_set_power(struct ov7740 *ov7740, int on)
+{
+	int ret;
+
+	if (on) {
+		ret = clk_prepare_enable(ov7740->xvclk);
+		if (ret)
+			return ret;
+
+		if (ov7740->pwdn_gpio)
+			gpiod_direction_output(ov7740->pwdn_gpio, 0);
+
+		if (ov7740->resetb_gpio) {
+			gpiod_set_value(ov7740->resetb_gpio, 1);
+			usleep_range(500, 1000);
+			gpiod_set_value(ov7740->resetb_gpio, 0);
+			usleep_range(3000, 5000);
+		}
+	} else {
+		clk_disable_unprepare(ov7740->xvclk);
+
+		if (ov7740->pwdn_gpio)
+			gpiod_direction_output(ov7740->pwdn_gpio, 0);
+	}
+
+	return 0;
+}
+
+static struct v4l2_subdev_core_ops ov7740_subdev_core_ops = {
+	.log_status = v4l2_ctrl_subdev_log_status,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+	.g_register = ov7740_get_register,
+	.s_register = ov7740_set_register,
+#endif
+	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
+	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
+};
+
+static int ov7740_set_white_balance(struct ov7740 *ov7740, int awb)
+{
+	struct regmap *regmap = ov7740->regmap;
+	unsigned int value;
+	int ret;
+
+	ret = regmap_read(regmap, REG_ISP_CTRL00, &value);
+	if (!ret) {
+		if (awb)
+			value |= (ISPCTRL00_AWB_EN | ISPCTRL00_AWB_GAIN_EN);
+		else
+			value &= ~(ISPCTRL00_AWB_EN | ISPCTRL00_AWB_GAIN_EN);
+		ret = regmap_write(regmap, REG_ISP_CTRL00, value);
+		if (ret)
+			return ret;
+	}
+
+	if (!awb) {
+		ret = regmap_write(regmap, REG_BGAIN,
+				   ov7740->blue_balance->val);
+		if (ret)
+			return ret;
+
+		ret = regmap_write(regmap, REG_RGAIN, ov7740->red_balance->val);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int ov7740_set_saturation(struct regmap *regmap, int value)
+{
+	int ret;
+
+	ret = regmap_write(regmap, REG_USAT, (unsigned char)value);
+	if (ret)
+		return ret;
+
+	return regmap_write(regmap, REG_VSAT, (unsigned char)value);
+}
+
+static int ov7740_set_gain(struct regmap *regmap, int value)
+{
+	int ret;
+
+	ret = regmap_write(regmap, REG_GAIN, value & 0xff);
+	if (ret)
+		return ret;
+
+	ret = regmap_update_bits(regmap, REG_CTRL15,
+				 REG15_GAIN_MSB, (value >> 8) & 0x3);
+	if (!ret)
+		ret = regmap_update_bits(regmap, REG_REG13, REG13_AGC_EN, 0);
+
+	return ret;
+}
+
+static int ov7740_set_autogain(struct regmap *regmap, int value)
+{
+	unsigned int reg;
+	int ret;
+
+	ret = regmap_read(regmap, REG_REG13, &reg);
+	if (ret)
+		return ret;
+	if (value)
+		reg |= REG13_AGC_EN;
+	else
+		reg &= ~REG13_AGC_EN;
+	return regmap_write(regmap, REG_REG13, reg);
+}
+
+static int ov7740_set_brightness(struct regmap *regmap, int value)
+{
+	/* Turn off AEC/AGC */
+	regmap_update_bits(regmap, REG_REG13, REG13_AEC_EN, 0);
+	regmap_update_bits(regmap, REG_REG13, REG13_AGC_EN, 0);
+
+	if (value >= 0) {
+		regmap_write(regmap, REG_YBRIGHT, (unsigned char)value);
+		regmap_update_bits(regmap, REG_SGNSET, SGNSET_YBRIGHT_MASK, 0);
+	} else{
+		regmap_write(regmap, REG_YBRIGHT, (unsigned char)(-value));
+		regmap_update_bits(regmap, REG_SGNSET, SGNSET_YBRIGHT_MASK, 1);
+	}
+
+	return 0;
+}
+
+static int ov7740_set_contrast(struct regmap *regmap, int value)
+{
+	return regmap_write(regmap, REG_YGAIN, (unsigned char)value);
+}
+
+static int ov7740_get_gain(struct ov7740 *ov7740, struct v4l2_ctrl *ctrl)
+{
+	struct regmap *regmap = ov7740->regmap;
+	unsigned int value0, value1;
+	int ret;
+
+	if (!ctrl->val)
+		return 0;
+
+	ret = regmap_read(regmap, REG_GAIN, &value0);
+	if (ret)
+		return ret;
+	ret = regmap_read(regmap, REG_CTRL15, &value1);
+	if (ret)
+		return ret;
+
+	ov7740->gain->val = (value1 << 8) | (value0 & 0xff);
+
+	return 0;
+}
+
+static int ov7740_set_exp(struct regmap *regmap, int value)
+{
+	int ret;
+
+	/* Turn off AEC/AGC */
+	ret = regmap_update_bits(regmap, REG_REG13,
+				 REG13_AEC_EN | REG13_AGC_EN, 0);
+	if (ret)
+		return ret;
+
+	ret = regmap_write(regmap, REG_AEC, (unsigned char)value);
+	if (ret)
+		return ret;
+
+	return regmap_write(regmap, REG_HAEC, (unsigned char)(value >> 8));
+}
+
+static int ov7740_set_autoexp(struct regmap *regmap,
+			      enum v4l2_exposure_auto_type value)
+{
+	unsigned int reg;
+	int ret;
+
+	ret = regmap_read(regmap, REG_REG13, &reg);
+	if (!ret) {
+		if (value == V4L2_EXPOSURE_AUTO)
+			reg |= (REG13_AEC_EN | REG13_AGC_EN);
+		else
+			reg &= ~(REG13_AEC_EN | REG13_AGC_EN);
+		ret = regmap_write(regmap, REG_REG13, reg);
+	}
+
+	return ret;
+}
+
+
+static int ov7740_get_volatile_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct ov7740 *ov7740 = container_of(ctrl->handler,
+					     struct ov7740, ctrl_handler);
+	int ret;
+
+	switch (ctrl->id) {
+	case V4L2_CID_AUTOGAIN:
+		ret = ov7740_get_gain(ov7740, ctrl);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
+static int ov7740_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct ov7740 *ov7740 = container_of(ctrl->handler,
+					     struct ov7740, ctrl_handler);
+	struct i2c_client *client = v4l2_get_subdevdata(&ov7740->subdev);
+	struct regmap *regmap = ov7740->regmap;
+	int ret;
+	u8 val = 0;
+
+	if (pm_runtime_get_if_in_use(&client->dev) <= 0)
+		return 0;
+
+	switch (ctrl->id) {
+	case V4L2_CID_AUTO_WHITE_BALANCE:
+		ret = ov7740_set_white_balance(ov7740, ctrl->val);
+		break;
+	case V4L2_CID_SATURATION:
+		ret = ov7740_set_saturation(regmap, ctrl->val);
+		break;
+	case V4L2_CID_BRIGHTNESS:
+		ret = ov7740_set_brightness(regmap, ctrl->val);
+		break;
+	case V4L2_CID_CONTRAST:
+		ret = ov7740_set_contrast(regmap, ctrl->val);
+		break;
+	case V4L2_CID_VFLIP:
+		ret = regmap_update_bits(regmap, REG_REG0C,
+					 REG0C_IMG_FLIP, val);
+		break;
+	case V4L2_CID_HFLIP:
+		val = ctrl->val ? REG0C_IMG_MIRROR : 0x00;
+		ret = regmap_update_bits(regmap, REG_REG0C,
+					 REG0C_IMG_MIRROR, val);
+		break;
+	case V4L2_CID_AUTOGAIN:
+		if (!ctrl->val)
+			return ov7740_set_gain(regmap, ov7740->gain->val);
+
+		ret = ov7740_set_autogain(regmap, ctrl->val);
+		break;
+
+	case V4L2_CID_EXPOSURE_AUTO:
+		if (ctrl->val == V4L2_EXPOSURE_MANUAL)
+			return ov7740_set_exp(regmap, ov7740->exposure->val);
+
+		ret = ov7740_set_autoexp(regmap, ctrl->val);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	pm_runtime_put(&client->dev);
+
+	return ret;
+}
+
+static const struct v4l2_ctrl_ops ov7740_ctrl_ops = {
+	.g_volatile_ctrl = ov7740_get_volatile_ctrl,
+	.s_ctrl = ov7740_set_ctrl,
+};
+
+static int ov7740_start_streaming(struct ov7740 *ov7740)
+{
+	int ret;
+
+	if (ov7740->fmt) {
+		ret = regmap_multi_reg_write(ov7740->regmap,
+					     ov7740->fmt->regs,
+					     ov7740->fmt->reg_num);
+		if (ret)
+			return ret;
+	}
+
+	if (ov7740->frmsize) {
+		ret = regmap_multi_reg_write(ov7740->regmap,
+					     ov7740->frmsize->regs,
+					     ov7740->frmsize->reg_num);
+		if (ret)
+			return ret;
+	}
+
+	return __v4l2_ctrl_handler_setup(ov7740->subdev.ctrl_handler);
+}
+
+static int ov7740_set_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	int ret = 0;
+
+	mutex_lock(&ov7740->mutex);
+	if (ov7740->streaming == enable) {
+		mutex_unlock(&ov7740->mutex);
+		return 0;
+	}
+
+	if (enable) {
+		ret = pm_runtime_get_sync(&client->dev);
+		if (ret < 0) {
+			pm_runtime_put_noidle(&client->dev);
+			goto err_unlock;
+		}
+
+		ret = ov7740_start_streaming(ov7740);
+		if (ret)
+			goto err_rpm_put;
+	} else {
+		pm_runtime_put(&client->dev);
+	}
+
+	ov7740->streaming = enable;
+
+	mutex_unlock(&ov7740->mutex);
+	return ret;
+
+err_rpm_put:
+	pm_runtime_put(&client->dev);
+err_unlock:
+	mutex_unlock(&ov7740->mutex);
+	return ret;
+}
+
+static int ov7740_get_parm(struct v4l2_subdev *sd,
+			   struct v4l2_streamparm *parms)
+{
+	struct v4l2_captureparm *cp = &parms->parm.capture;
+	struct v4l2_fract *tpf = &cp->timeperframe;
+
+	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	memset(cp, 0, sizeof(struct v4l2_captureparm));
+	cp->capability = V4L2_CAP_TIMEPERFRAME;
+
+	tpf->numerator = 1;
+	tpf->denominator = 60;
+
+	return 0;
+}
+
+static int ov7740_set_parm(struct v4l2_subdev *sd,
+			   struct v4l2_streamparm *parms)
+{
+	struct v4l2_captureparm *cp = &parms->parm.capture;
+	struct v4l2_fract *tpf = &cp->timeperframe;
+
+	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+	if (cp->extendedmode != 0)
+		return -EINVAL;
+
+	cp->capability = V4L2_CAP_TIMEPERFRAME;
+
+	tpf->numerator = 1;
+	tpf->denominator = 60;
+
+	return 0;
+}
+
+static struct v4l2_subdev_video_ops ov7740_subdev_video_ops = {
+	.s_stream = ov7740_set_stream,
+	.s_parm = ov7740_set_parm,
+	.g_parm = ov7740_get_parm,
+};
+
+static const struct reg_sequence ov7740_format_yuyv[] = {
+	{0x12, 0x00},
+	{0x36, 0x3f},
+	{0x80, 0x7f},
+	{0x83, 0x01},
+};
+
+static const struct reg_sequence ov7740_format_bggr8[] = {
+	{0x36, 0x2f},
+	{0x80, 0x01},
+	{0x83, 0x04},
+};
+
+static const struct ov7740_pixfmt ov7740_formats[] = {
+	{
+		.mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
+		.colorspace = V4L2_COLORSPACE_SRGB,
+		.regs = ov7740_format_yuyv,
+		.reg_num = ARRAY_SIZE(ov7740_format_yuyv),
+	},
+	{
+		.mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
+		.colorspace = V4L2_COLORSPACE_SRGB,
+		.regs = ov7740_format_bggr8,
+		.reg_num = ARRAY_SIZE(ov7740_format_bggr8),
+	}
+};
+#define N_OV7740_FMTS ARRAY_SIZE(ov7740_formats)
+
+static int ov7740_enum_mbus_code(struct v4l2_subdev *sd,
+				 struct v4l2_subdev_pad_config *cfg,
+				 struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->pad || code->index >= N_OV7740_FMTS)
+		return -EINVAL;
+
+	code->code = ov7740_formats[code->index].mbus_code;
+
+	return 0;
+}
+
+static int ov7740_enum_frame_interval(struct v4l2_subdev *sd,
+				struct v4l2_subdev_pad_config *cfg,
+				struct v4l2_subdev_frame_interval_enum *fie)
+{
+	if (fie->pad)
+		return -EINVAL;
+
+	if (fie->index >= 1)
+		return -EINVAL;
+
+	if ((fie->width != VGA_WIDTH) || (fie->height != VGA_HEIGHT))
+		return -EINVAL;
+
+	fie->interval.numerator = 1;
+	fie->interval.denominator = 60;
+
+	return 0;
+}
+
+static int ov7740_enum_frame_size(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_pad_config *cfg,
+				  struct v4l2_subdev_frame_size_enum *fse)
+{
+	if (fse->pad)
+		return -EINVAL;
+
+	if (fse->index > 0)
+		return -EINVAL;
+
+	fse->min_width = fse->max_width = VGA_WIDTH;
+	fse->min_height = fse->max_height = VGA_HEIGHT;
+
+	return 0;
+}
+
+static int ov7740_try_fmt_internal(struct v4l2_subdev *sd,
+				   struct v4l2_mbus_framefmt *fmt,
+				   const struct ov7740_pixfmt **ret_fmt,
+				   const struct ov7740_framesize **ret_frmsize)
+{
+	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
+	const struct ov7740_framesize *fsize = &ov7740_framesizes[0];
+	int index, i;
+
+	for (index = 0; index < N_OV7740_FMTS; index++) {
+		if (ov7740_formats[index].mbus_code == fmt->code)
+			break;
+	}
+	if (index >= N_OV7740_FMTS) {
+		/* default to first format */
+		index = 0;
+		fmt->code = ov7740_formats[0].mbus_code;
+	}
+	if (ret_fmt != NULL)
+		*ret_fmt = ov7740_formats + index;
+
+	for (i = 0; i < ARRAY_SIZE(ov7740_framesizes); i++) {
+		if ((fsize->width >= fmt->width) &&
+		    (fsize->height >= fmt->height)) {
+			fmt->width = fsize->width;
+			fmt->height = fsize->height;
+			break;
+		}
+
+		fsize++;
+	}
+
+	if (ret_frmsize != NULL)
+		*ret_frmsize = fsize;
+
+	fmt->field = V4L2_FIELD_NONE;
+	fmt->colorspace = ov7740_formats[index].colorspace;
+
+	ov7740->format = *fmt;
+
+	return 0;
+}
+
+static int ov7740_set_fmt(struct v4l2_subdev *sd,
+			  struct v4l2_subdev_pad_config *cfg,
+			  struct v4l2_subdev_format *format)
+{
+	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
+	const struct ov7740_pixfmt *ovfmt;
+	const struct ov7740_framesize *fsize;
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+	struct v4l2_mbus_framefmt *mbus_fmt;
+#endif
+	int ret;
+
+	mutex_lock(&ov7740->mutex);
+	if (format->pad) {
+		ret = -EINVAL;
+		goto error;
+	}
+
+	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
+		ret = ov7740_try_fmt_internal(sd, &format->format, NULL, NULL);
+		if (ret)
+			goto error;
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+		mbus_fmt = v4l2_subdev_get_try_format(sd, cfg, format->pad);
+		*mbus_fmt = format->format;
+
+		mutex_unlock(&ov7740->mutex);
+		return 0;
+#else
+		ret = -ENOTTY;
+		goto error;
+#endif
+	}
+
+	ret = ov7740_try_fmt_internal(sd, &format->format, &ovfmt, &fsize);
+	if (ret)
+		goto error;
+
+	ov7740->fmt = ovfmt;
+	ov7740->frmsize = fsize;
+
+	mutex_unlock(&ov7740->mutex);
+	return 0;
+
+error:
+	mutex_unlock(&ov7740->mutex);
+	return ret;
+}
+
+static int ov7740_get_fmt(struct v4l2_subdev *sd,
+			  struct v4l2_subdev_pad_config *cfg,
+			  struct v4l2_subdev_format *format)
+{
+	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+	struct v4l2_mbus_framefmt *mbus_fmt;
+#endif
+	int ret = 0;
+
+	mutex_lock(&ov7740->mutex);
+	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+		mbus_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
+		format->format = *mbus_fmt;
+		ret = 0;
+#else
+		ret = -ENOTTY;
+#endif
+	} else {
+		format->format = ov7740->format;
+	}
+	mutex_unlock(&ov7740->mutex);
+
+	return ret;
+}
+
+static const struct v4l2_subdev_pad_ops ov7740_subdev_pad_ops = {
+	.enum_frame_interval = ov7740_enum_frame_interval,
+	.enum_frame_size = ov7740_enum_frame_size,
+	.enum_mbus_code = ov7740_enum_mbus_code,
+	.get_fmt = ov7740_get_fmt,
+	.set_fmt = ov7740_set_fmt,
+};
+
+static const struct v4l2_subdev_ops ov7740_subdev_ops = {
+	.core	= &ov7740_subdev_core_ops,
+	.video	= &ov7740_subdev_video_ops,
+	.pad	= &ov7740_subdev_pad_ops,
+};
+
+static void ov7740_get_default_format(struct v4l2_subdev *sd,
+				      struct v4l2_mbus_framefmt *format)
+{
+	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
+
+	format->width = ov7740->frmsize->width;
+	format->height = ov7740->frmsize->height;
+	format->colorspace = ov7740->fmt->colorspace;
+	format->code = ov7740->fmt->mbus_code;
+	format->field = V4L2_FIELD_NONE;
+}
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+static int ov7740_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
+	struct v4l2_mbus_framefmt *format =
+				v4l2_subdev_get_try_format(sd, fh->pad, 0);
+
+	mutex_lock(&ov7740->mutex);
+	ov7740_get_default_format(sd, format);
+	mutex_unlock(&ov7740->mutex);
+
+	return 0;
+}
+
+static const struct v4l2_subdev_internal_ops ov7740_subdev_internal_ops = {
+	.open = ov7740_open,
+};
+#endif
+
+static int ov7740_probe_dt(struct i2c_client *client,
+			   struct ov7740 *ov7740)
+{
+	ov7740->resetb_gpio = devm_gpiod_get_optional(&client->dev, "reset",
+			GPIOD_OUT_HIGH);
+	if (IS_ERR(ov7740->resetb_gpio)) {
+		dev_info(&client->dev, "can't get %s GPIO\n", "reset");
+		return PTR_ERR(ov7740->resetb_gpio);
+	}
+
+	ov7740->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown",
+			GPIOD_OUT_LOW);
+	if (IS_ERR(ov7740->pwdn_gpio)) {
+		dev_info(&client->dev, "can't get %s GPIO\n", "powerdown");
+		return PTR_ERR(ov7740->pwdn_gpio);
+	}
+
+	return 0;
+}
+
+static int ov7740_detect(struct ov7740 *ov7740)
+{
+	struct regmap *regmap = ov7740->regmap;
+	unsigned int midh, midl, pidh, pidl;
+	int ret;
+
+	ret = regmap_read(regmap, REG_MIDH, &midh);
+	if (ret)
+		return ret;
+	if (midh != 0x7f)
+		return -ENODEV;
+
+	ret = regmap_read(regmap, REG_MIDL, &midl);
+	if (ret)
+		return ret;
+	if (midl != 0xa2)
+		return -ENODEV;
+
+	ret = regmap_read(regmap, REG_PIDH, &pidh);
+	if (ret)
+		return ret;
+	if (pidh != 0x77)
+		return -ENODEV;
+
+	ret = regmap_read(regmap, REG_PIDL, &pidl);
+	if (ret)
+		return ret;
+	if ((pidl != 0x40) && (pidl != 0x41) && (pidl != 0x42))
+		return -ENODEV;
+
+	return 0;
+}
+
+static int ov7740_init_controls(struct ov7740 *ov7740)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov7740->subdev);
+	struct v4l2_ctrl_handler *ctrl_hdlr = &ov7740->ctrl_handler;
+	int ret;
+
+	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 2);
+	if (ret < 0)
+		return ret;
+
+	ctrl_hdlr->lock = &ov7740->mutex;
+	ov7740->auto_wb = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
+					  V4L2_CID_AUTO_WHITE_BALANCE,
+					  0, 1, 1, 1);
+	ov7740->blue_balance = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
+					       V4L2_CID_BLUE_BALANCE,
+					       0, 0xff, 1, 0x80);
+	ov7740->red_balance = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
+					      V4L2_CID_RED_BALANCE,
+					      0, 0xff, 1, 0x80);
+
+	ov7740->brightness = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
+					     V4L2_CID_BRIGHTNESS,
+					     -255, 255, 1, 0);
+	ov7740->contrast = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
+					   V4L2_CID_CONTRAST,
+					   0, 127, 1, 0x20);
+	ov7740->saturation = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
+			  V4L2_CID_SATURATION, 0, 256, 1, 0x80);
+	ov7740->hflip = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
+					V4L2_CID_HFLIP, 0, 1, 1, 0);
+	ov7740->vflip = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
+					V4L2_CID_VFLIP, 0, 1, 1, 0);
+	ov7740->gain = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
+				       V4L2_CID_GAIN, 0, 1023, 1, 500);
+	ov7740->auto_gain = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
+					    V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
+	ov7740->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
+					   V4L2_CID_EXPOSURE, 0, 65535, 1, 500);
+	ov7740->auto_exposure = v4l2_ctrl_new_std_menu(ctrl_hdlr,
+					&ov7740_ctrl_ops,
+					V4L2_CID_EXPOSURE_AUTO,
+					V4L2_EXPOSURE_MANUAL, 0,
+					V4L2_EXPOSURE_AUTO);
+
+	ov7740->gain->flags |= V4L2_CTRL_FLAG_VOLATILE;
+	ov7740->exposure->flags |= V4L2_CTRL_FLAG_VOLATILE;
+
+	v4l2_ctrl_auto_cluster(3, &ov7740->auto_wb, 0, false);
+	v4l2_ctrl_auto_cluster(2, &ov7740->auto_gain, 0, true);
+	v4l2_ctrl_auto_cluster(2, &ov7740->auto_exposure,
+			       V4L2_EXPOSURE_MANUAL, false);
+	v4l2_ctrl_cluster(2, &ov7740->hflip);
+
+	ret = v4l2_ctrl_handler_setup(ctrl_hdlr);
+	if (ret) {
+		dev_err(&client->dev, "%s control init failed (%d)\n",
+			__func__, ret);
+		goto error;
+	}
+
+	ov7740->subdev.ctrl_handler = ctrl_hdlr;
+	return 0;
+
+error:
+	v4l2_ctrl_handler_free(ctrl_hdlr);
+	mutex_destroy(&ov7740->mutex);
+	return ret;
+}
+
+static void ov7740_free_controls(struct ov7740 *ov7740)
+{
+	v4l2_ctrl_handler_free(ov7740->subdev.ctrl_handler);
+	mutex_destroy(&ov7740->mutex);
+}
+
+#define OV7740_MAX_REGISTER     0xff
+static const struct regmap_config ov7740_regmap_config = {
+	.reg_bits	= 8,
+	.val_bits	= 8,
+	.max_register	= OV7740_MAX_REGISTER,
+};
+
+static int ov7740_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct ov7740 *ov7740;
+	struct v4l2_subdev *sd;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_BYTE_DATA)) {
+		dev_err(&client->dev,
+			"OV7740: I2C-Adapter doesn't support SMBUS\n");
+		return -EIO;
+	}
+
+	ov7740 = devm_kzalloc(&client->dev, sizeof(*ov7740), GFP_KERNEL);
+	if (!ov7740)
+		return -ENOMEM;
+
+	ov7740->xvclk = devm_clk_get(&client->dev, "xvclk");
+	if (IS_ERR(ov7740->xvclk)) {
+		ret = PTR_ERR(ov7740->xvclk);
+		dev_err(&client->dev,
+			"OV7740: fail to get xvclk: %d\n", ret);
+		return ret;
+	}
+
+	ret = ov7740_probe_dt(client, ov7740);
+	if (ret)
+		return ret;
+
+	ov7740->regmap = devm_regmap_init_i2c(client, &ov7740_regmap_config);
+	if (IS_ERR(ov7740->regmap)) {
+		ret = PTR_ERR(ov7740->regmap);
+		dev_err(&client->dev, "Failed to allocate register map: %d\n",
+			ret);
+		return ret;
+	}
+
+	sd = &ov7740->subdev;
+	client->flags |= I2C_CLIENT_SCCB;
+	v4l2_i2c_subdev_init(sd, client, &ov7740_subdev_ops);
+
+#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
+	sd->internal_ops = &ov7740_subdev_internal_ops;
+	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+#endif
+
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	ov7740->pad.flags = MEDIA_PAD_FL_SOURCE;
+	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
+	ret = media_entity_pads_init(&sd->entity, 1, &ov7740->pad);
+	if (ret)
+		return ret;
+#endif
+
+	ret = ov7740_set_power(ov7740, 1);
+	if (ret)
+		return ret;
+
+	ret = ov7740_detect(ov7740);
+	if (ret)
+		goto error_detect;
+
+	mutex_init(&ov7740->mutex);
+
+	ret = ov7740_init_controls(ov7740);
+	if (ret)
+		goto error_init_controls;
+
+	v4l_info(client, "chip found @ 0x%02x (%s)\n",
+			client->addr << 1, client->adapter->name);
+
+	ov7740->fmt = &ov7740_formats[0];
+	ov7740->frmsize = &ov7740_framesizes[0];
+
+	ov7740_get_default_format(sd, &ov7740->format);
+
+	ret = v4l2_async_register_subdev(sd);
+	if (ret)
+		goto error_async_register;
+
+	pm_runtime_set_active(&client->dev);
+	pm_runtime_enable(&client->dev);
+	pm_runtime_idle(&client->dev);
+
+	return 0;
+
+error_async_register:
+	v4l2_ctrl_handler_free(ov7740->subdev.ctrl_handler);
+error_init_controls:
+	ov7740_free_controls(ov7740);
+error_detect:
+	ov7740_set_power(ov7740, 0);
+	media_entity_cleanup(&ov7740->subdev.entity);
+
+	return ret;
+}
+
+static int ov7740_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
+
+	mutex_destroy(&ov7740->mutex);
+	v4l2_ctrl_handler_free(ov7740->subdev.ctrl_handler);
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	media_entity_cleanup(&ov7740->subdev.entity);
+#endif
+	v4l2_async_unregister_subdev(sd);
+	ov7740_free_controls(ov7740);
+
+	pm_runtime_get_sync(&client->dev);
+	pm_runtime_disable(&client->dev);
+	pm_runtime_set_suspended(&client->dev);
+	pm_runtime_put_noidle(&client->dev);
+
+	ov7740_set_power(ov7740, 0);
+	return 0;
+}
+
+static int __maybe_unused ov7740_runtime_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
+
+	ov7740_set_power(ov7740, 0);
+
+	return 0;
+}
+
+static int __maybe_unused ov7740_runtime_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
+
+	return ov7740_set_power(ov7740, 1);
+}
+
+static const struct i2c_device_id ov7740_id[] = {
+	{ "ov7740", 0 },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, ov7740_id);
+
+static const struct dev_pm_ops ov7740_pm_ops = {
+	SET_RUNTIME_PM_OPS(ov7740_runtime_suspend, ov7740_runtime_resume, NULL)
+};
+
+static const struct of_device_id ov7740_of_match[] = {
+	{.compatible = "ovti,ov7740", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, ov7740_of_match);
+
+static struct i2c_driver ov7740_i2c_driver = {
+	.driver = {
+		.name = "ov7740",
+		.pm = &ov7740_pm_ops,
+		.of_match_table = of_match_ptr(ov7740_of_match),
+	},
+	.probe    = ov7740_probe,
+	.remove   = ov7740_remove,
+	.id_table = ov7740_id,
+};
+module_i2c_driver(ov7740_i2c_driver);
+
+MODULE_DESCRIPTION("The V4L2 driver for Omnivision 7740 sensor");
+MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
+MODULE_LICENSE("GPL v2");