media: imx208: Add imx208 camera sensor driver

Add a V4L2 sub-device driver for the Sony IMX208 image sensor.
This is a camera sensor using the I2C bus for control and the
CSI-2 bus for data.

[Sakari Ailus: Rename sensor async register function to make it compile,
	       use exposure_max and wrap a few long lines.]

Signed-off-by: Ping-Chung Chen <ping-chung.chen@intel.com>
Signed-off-by: Yeh, Andy <andy.yeh@intel.com>
Signed-off-by: Shawn Tu <shawnx.tu@intel.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

3 files changed, 1099 insertions, 0 deletions

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 4f1dafc64816..588f8eb95984 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -742,6 +742,17 @@ config VIDEO_HI556
 	  To compile this driver as a module, choose M here: the
 	  module will be called hi556.
 
+config VIDEO_IMX208
+	tristate "Sony IMX208 sensor support"
+	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
+	depends on MEDIA_CAMERA_SUPPORT
+	help
+	  This is a Video4Linux2 sensor driver for the Sony
+	  IMX208 camera.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called imx208.
+
 config VIDEO_IMX214
 	tristate "Sony IMX214 sensor support"
 	depends on GPIOLIB && I2C && VIDEO_V4L2
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 0c067beca066..1168fa6b84ed 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -116,6 +116,7 @@ obj-$(CONFIG_VIDEO_ML86V7667)	+= ml86v7667.o
 obj-$(CONFIG_VIDEO_OV2659)	+= ov2659.o
 obj-$(CONFIG_VIDEO_TC358743)	+= tc358743.o
 obj-$(CONFIG_VIDEO_HI556)	+= hi556.o
+obj-$(CONFIG_VIDEO_IMX208)	+= imx208.o
 obj-$(CONFIG_VIDEO_IMX214)	+= imx214.o
 obj-$(CONFIG_VIDEO_IMX219)	+= imx219.o
 obj-$(CONFIG_VIDEO_IMX258)	+= imx258.o
diff --git a/drivers/media/i2c/imx208.c b/drivers/media/i2c/imx208.c
new file mode 100644
index 000000000000..9ed261ea7255
--- /dev/null
+++ b/drivers/media/i2c/imx208.c
@@ -0,0 +1,1087 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2021 Intel Corporation
+
+#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <asm/unaligned.h>
+
+#define IMX208_REG_MODE_SELECT		0x0100
+#define IMX208_MODE_STANDBY		0x00
+#define IMX208_MODE_STREAMING		0x01
+
+/* Chip ID */
+#define IMX208_REG_CHIP_ID		0x0000
+#define IMX208_CHIP_ID			0x0208
+
+/* V_TIMING internal */
+#define IMX208_REG_VTS			0x0340
+#define IMX208_VTS_60FPS		0x0472
+#define IMX208_VTS_BINNING		0x0239
+#define IMX208_VTS_60FPS_MIN		0x0458
+#define IMX208_VTS_BINNING_MIN		0x0230
+#define IMX208_VTS_MAX			0xffff
+
+/* HBLANK control - read only */
+#define IMX208_PPL_384MHZ		2248
+#define IMX208_PPL_96MHZ		2248
+
+/* Exposure control */
+#define IMX208_REG_EXPOSURE		0x0202
+#define IMX208_EXPOSURE_MIN		4
+#define IMX208_EXPOSURE_STEP		1
+#define IMX208_EXPOSURE_DEFAULT		0x190
+#define IMX208_EXPOSURE_MAX		65535
+
+/* Analog gain control */
+#define IMX208_REG_ANALOG_GAIN		0x0204
+#define IMX208_ANA_GAIN_MIN		0
+#define IMX208_ANA_GAIN_MAX		0x00e0
+#define IMX208_ANA_GAIN_STEP		1
+#define IMX208_ANA_GAIN_DEFAULT		0x0
+
+/* Digital gain control */
+#define IMX208_REG_GR_DIGITAL_GAIN	0x020e
+#define IMX208_REG_R_DIGITAL_GAIN	0x0210
+#define IMX208_REG_B_DIGITAL_GAIN	0x0212
+#define IMX208_REG_GB_DIGITAL_GAIN	0x0214
+#define IMX208_DIGITAL_GAIN_SHIFT	8
+
+/* Orientation */
+#define IMX208_REG_ORIENTATION_CONTROL	0x0101
+
+/* Test Pattern Control */
+#define IMX208_REG_TEST_PATTERN_MODE	0x0600
+#define IMX208_TEST_PATTERN_DISABLE	0x0
+#define IMX208_TEST_PATTERN_SOLID_COLOR	0x1
+#define IMX208_TEST_PATTERN_COLOR_BARS	0x2
+#define IMX208_TEST_PATTERN_GREY_COLOR	0x3
+#define IMX208_TEST_PATTERN_PN9		0x4
+#define IMX208_TEST_PATTERN_FIX_1	0x100
+#define IMX208_TEST_PATTERN_FIX_2	0x101
+#define IMX208_TEST_PATTERN_FIX_3	0x102
+#define IMX208_TEST_PATTERN_FIX_4	0x103
+#define IMX208_TEST_PATTERN_FIX_5	0x104
+#define IMX208_TEST_PATTERN_FIX_6	0x105
+
+/* OTP Access */
+#define IMX208_OTP_BASE			0x3500
+#define IMX208_OTP_SIZE			40
+
+struct imx208_reg {
+	u16 address;
+	u8 val;
+};
+
+struct imx208_reg_list {
+	u32 num_of_regs;
+	const struct imx208_reg *regs;
+};
+
+/* Link frequency config */
+struct imx208_link_freq_config {
+	u32 pixels_per_line;
+
+	/* PLL registers for this link frequency */
+	struct imx208_reg_list reg_list;
+};
+
+/* Mode : resolution and related config&values */
+struct imx208_mode {
+	/* Frame width */
+	u32 width;
+	/* Frame height */
+	u32 height;
+
+	/* V-timing */
+	u32 vts_def;
+	u32 vts_min;
+
+	/* Index of Link frequency config to be used */
+	u32 link_freq_index;
+	/* Default register values */
+	struct imx208_reg_list reg_list;
+};
+
+static const struct imx208_reg pll_ctrl_reg[] = {
+	{0x0305, 0x02},
+	{0x0307, 0x50},
+	{0x303C, 0x3C},
+};
+
+static const struct imx208_reg mode_1936x1096_60fps_regs[] = {
+	{0x0340, 0x04},
+	{0x0341, 0x72},
+	{0x0342, 0x04},
+	{0x0343, 0x64},
+	{0x034C, 0x07},
+	{0x034D, 0x90},
+	{0x034E, 0x04},
+	{0x034F, 0x48},
+	{0x0381, 0x01},
+	{0x0383, 0x01},
+	{0x0385, 0x01},
+	{0x0387, 0x01},
+	{0x3048, 0x00},
+	{0x3050, 0x01},
+	{0x30D5, 0x00},
+	{0x3301, 0x00},
+	{0x3318, 0x62},
+	{0x0202, 0x01},
+	{0x0203, 0x90},
+	{0x0205, 0x00},
+};
+
+static const struct imx208_reg mode_968_548_60fps_regs[] = {
+	{0x0340, 0x02},
+	{0x0341, 0x39},
+	{0x0342, 0x08},
+	{0x0343, 0xC8},
+	{0x034C, 0x03},
+	{0x034D, 0xC8},
+	{0x034E, 0x02},
+	{0x034F, 0x24},
+	{0x0381, 0x01},
+	{0x0383, 0x03},
+	{0x0385, 0x01},
+	{0x0387, 0x03},
+	{0x3048, 0x01},
+	{0x3050, 0x02},
+	{0x30D5, 0x03},
+	{0x3301, 0x10},
+	{0x3318, 0x75},
+	{0x0202, 0x01},
+	{0x0203, 0x90},
+	{0x0205, 0x00},
+};
+
+static const s64 imx208_discrete_digital_gain[] = {
+	1, 2, 4, 8, 16,
+};
+
+static const char * const imx208_test_pattern_menu[] = {
+	"Disabled",
+	"Solid Color",
+	"100% Color Bar",
+	"Fade to Grey Color Bar",
+	"PN9",
+	"Fixed Pattern1",
+	"Fixed Pattern2",
+	"Fixed Pattern3",
+	"Fixed Pattern4",
+	"Fixed Pattern5",
+	"Fixed Pattern6"
+};
+
+static const int imx208_test_pattern_val[] = {
+	IMX208_TEST_PATTERN_DISABLE,
+	IMX208_TEST_PATTERN_SOLID_COLOR,
+	IMX208_TEST_PATTERN_COLOR_BARS,
+	IMX208_TEST_PATTERN_GREY_COLOR,
+	IMX208_TEST_PATTERN_PN9,
+	IMX208_TEST_PATTERN_FIX_1,
+	IMX208_TEST_PATTERN_FIX_2,
+	IMX208_TEST_PATTERN_FIX_3,
+	IMX208_TEST_PATTERN_FIX_4,
+	IMX208_TEST_PATTERN_FIX_5,
+	IMX208_TEST_PATTERN_FIX_6,
+};
+
+/* Configurations for supported link frequencies */
+#define IMX208_MHZ			(1000 * 1000ULL)
+#define IMX208_LINK_FREQ_384MHZ		(384ULL * IMX208_MHZ)
+#define IMX208_LINK_FREQ_96MHZ		(96ULL * IMX208_MHZ)
+
+#define IMX208_DATA_RATE_DOUBLE		2
+#define IMX208_NUM_OF_LANES		2
+#define IMX208_PIXEL_BITS		10
+
+enum {
+	IMX208_LINK_FREQ_384MHZ_INDEX,
+	IMX208_LINK_FREQ_96MHZ_INDEX,
+};
+
+/*
+ * pixel_rate = link_freq * data-rate * nr_of_lanes / bits_per_sample
+ * data rate => double data rate; number of lanes => 2; bits per pixel => 10
+ */
+static u64 link_freq_to_pixel_rate(u64 f)
+{
+	f *= IMX208_DATA_RATE_DOUBLE * IMX208_NUM_OF_LANES;
+	do_div(f, IMX208_PIXEL_BITS);
+
+	return f;
+}
+
+/* Menu items for LINK_FREQ V4L2 control */
+static const s64 link_freq_menu_items[] = {
+	[IMX208_LINK_FREQ_384MHZ_INDEX] = IMX208_LINK_FREQ_384MHZ,
+	[IMX208_LINK_FREQ_96MHZ_INDEX] = IMX208_LINK_FREQ_96MHZ,
+};
+
+/* Link frequency configs */
+static const struct imx208_link_freq_config link_freq_configs[] = {
+	[IMX208_LINK_FREQ_384MHZ_INDEX] = {
+		.pixels_per_line = IMX208_PPL_384MHZ,
+		.reg_list = {
+			.num_of_regs = ARRAY_SIZE(pll_ctrl_reg),
+			.regs = pll_ctrl_reg,
+		}
+	},
+	[IMX208_LINK_FREQ_96MHZ_INDEX] = {
+		.pixels_per_line = IMX208_PPL_96MHZ,
+		.reg_list = {
+			.num_of_regs = ARRAY_SIZE(pll_ctrl_reg),
+			.regs = pll_ctrl_reg,
+		}
+	},
+};
+
+/* Mode configs */
+static const struct imx208_mode supported_modes[] = {
+	{
+		.width = 1936,
+		.height = 1096,
+		.vts_def = IMX208_VTS_60FPS,
+		.vts_min = IMX208_VTS_60FPS_MIN,
+		.reg_list = {
+			.num_of_regs = ARRAY_SIZE(mode_1936x1096_60fps_regs),
+			.regs = mode_1936x1096_60fps_regs,
+		},
+		.link_freq_index = IMX208_LINK_FREQ_384MHZ_INDEX,
+	},
+	{
+		.width = 968,
+		.height = 548,
+		.vts_def = IMX208_VTS_BINNING,
+		.vts_min = IMX208_VTS_BINNING_MIN,
+		.reg_list = {
+			.num_of_regs = ARRAY_SIZE(mode_968_548_60fps_regs),
+			.regs = mode_968_548_60fps_regs,
+		},
+		.link_freq_index = IMX208_LINK_FREQ_96MHZ_INDEX,
+	},
+};
+
+struct imx208 {
+	struct v4l2_subdev sd;
+	struct media_pad pad;
+
+	struct v4l2_ctrl_handler ctrl_handler;
+	/* V4L2 Controls */
+	struct v4l2_ctrl *link_freq;
+	struct v4l2_ctrl *pixel_rate;
+	struct v4l2_ctrl *vblank;
+	struct v4l2_ctrl *hblank;
+	struct v4l2_ctrl *vflip;
+	struct v4l2_ctrl *hflip;
+
+	/* Current mode */
+	const struct imx208_mode *cur_mode;
+
+	/*
+	 * Mutex for serialized access:
+	 * Protect sensor set pad format and start/stop streaming safely.
+	 * Protect access to sensor v4l2 controls.
+	 */
+	struct mutex imx208_mx;
+
+	/* Streaming on/off */
+	bool streaming;
+
+	/* OTP data */
+	bool otp_read;
+	char otp_data[IMX208_OTP_SIZE];
+};
+
+static inline struct imx208 *to_imx208(struct v4l2_subdev *_sd)
+{
+	return container_of(_sd, struct imx208, sd);
+}
+
+/* Get bayer order based on flip setting. */
+static u32 imx208_get_format_code(struct imx208 *imx208)
+{
+	/*
+	 * Only one bayer order is supported.
+	 * It depends on the flip settings.
+	 */
+	static const u32 codes[2][2] = {
+		{ MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10, },
+		{ MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SBGGR10_1X10, },
+	};
+
+	return codes[imx208->vflip->val][imx208->hflip->val];
+}
+
+/* Read registers up to 4 at a time */
+static int imx208_read_reg(struct imx208 *imx208, u16 reg, u32 len, u32 *val)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
+	struct i2c_msg msgs[2];
+	u8 addr_buf[2] = { reg >> 8, reg & 0xff };
+	u8 data_buf[4] = { 0, };
+	int ret;
+
+	if (len > 4)
+		return -EINVAL;
+
+	/* Write register address */
+	msgs[0].addr = client->addr;
+	msgs[0].flags = 0;
+	msgs[0].len = ARRAY_SIZE(addr_buf);
+	msgs[0].buf = addr_buf;
+
+	/* Read data from register */
+	msgs[1].addr = client->addr;
+	msgs[1].flags = I2C_M_RD;
+	msgs[1].len = len;
+	msgs[1].buf = &data_buf[4 - len];
+
+	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+	if (ret != ARRAY_SIZE(msgs))
+		return -EIO;
+
+	*val = get_unaligned_be32(data_buf);
+
+	return 0;
+}
+
+/* Write registers up to 4 at a time */
+static int imx208_write_reg(struct imx208 *imx208, u16 reg, u32 len, u32 val)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
+	u8 buf[6];
+
+	if (len > 4)
+		return -EINVAL;
+
+	put_unaligned_be16(reg, buf);
+	put_unaligned_be32(val << (8 * (4 - len)), buf + 2);
+	if (i2c_master_send(client, buf, len + 2) != len + 2)
+		return -EIO;
+
+	return 0;
+}
+
+/* Write a list of registers */
+static int imx208_write_regs(struct imx208 *imx208,
+			     const struct imx208_reg *regs, u32 len)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < len; i++) {
+		ret = imx208_write_reg(imx208, regs[i].address, 1,
+				       regs[i].val);
+		if (ret) {
+			dev_err_ratelimited(&client->dev,
+					    "Failed to write reg 0x%4.4x. error = %d\n",
+					    regs[i].address, ret);
+
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+/* Open sub-device */
+static int imx208_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+	struct v4l2_mbus_framefmt *try_fmt =
+		v4l2_subdev_get_try_format(sd, fh->pad, 0);
+
+	/* Initialize try_fmt */
+	try_fmt->width = supported_modes[0].width;
+	try_fmt->height = supported_modes[0].height;
+	try_fmt->code = MEDIA_BUS_FMT_SRGGB10_1X10;
+	try_fmt->field = V4L2_FIELD_NONE;
+
+	return 0;
+}
+
+static int imx208_update_digital_gain(struct imx208 *imx208, u32 len, u32 val)
+{
+	int ret;
+
+	val = imx208_discrete_digital_gain[val] << IMX208_DIGITAL_GAIN_SHIFT;
+
+	ret = imx208_write_reg(imx208, IMX208_REG_GR_DIGITAL_GAIN, 2, val);
+	if (ret)
+		return ret;
+
+	ret = imx208_write_reg(imx208, IMX208_REG_GB_DIGITAL_GAIN, 2, val);
+	if (ret)
+		return ret;
+
+	ret = imx208_write_reg(imx208, IMX208_REG_R_DIGITAL_GAIN, 2, val);
+	if (ret)
+		return ret;
+
+	return imx208_write_reg(imx208, IMX208_REG_B_DIGITAL_GAIN, 2, val);
+}
+
+static int imx208_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct imx208 *imx208 =
+		container_of(ctrl->handler, struct imx208, ctrl_handler);
+	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
+	int ret;
+
+	/*
+	 * Applying V4L2 control value only happens
+	 * when power is up for streaming
+	 */
+	if (!pm_runtime_get_if_in_use(&client->dev))
+		return 0;
+
+	switch (ctrl->id) {
+	case V4L2_CID_ANALOGUE_GAIN:
+		ret = imx208_write_reg(imx208, IMX208_REG_ANALOG_GAIN,
+				       2, ctrl->val);
+		break;
+	case V4L2_CID_EXPOSURE:
+		ret = imx208_write_reg(imx208, IMX208_REG_EXPOSURE,
+				       2, ctrl->val);
+		break;
+	case V4L2_CID_DIGITAL_GAIN:
+		ret = imx208_update_digital_gain(imx208, 2, ctrl->val);
+		break;
+	case V4L2_CID_VBLANK:
+		/* Update VTS that meets expected vertical blanking */
+		ret = imx208_write_reg(imx208, IMX208_REG_VTS, 2,
+				       imx208->cur_mode->height + ctrl->val);
+		break;
+	case V4L2_CID_TEST_PATTERN:
+		ret = imx208_write_reg(imx208, IMX208_REG_TEST_PATTERN_MODE,
+				       2, imx208_test_pattern_val[ctrl->val]);
+		break;
+	case V4L2_CID_HFLIP:
+	case V4L2_CID_VFLIP:
+		ret = imx208_write_reg(imx208, IMX208_REG_ORIENTATION_CONTROL,
+				       1,
+				       imx208->hflip->val |
+				       imx208->vflip->val << 1);
+		break;
+	default:
+		ret = -EINVAL;
+		dev_err(&client->dev,
+			"ctrl(id:0x%x,val:0x%x) is not handled\n",
+			ctrl->id, ctrl->val);
+		break;
+	}
+
+	pm_runtime_put(&client->dev);
+
+	return ret;
+}
+
+static const struct v4l2_ctrl_ops imx208_ctrl_ops = {
+	.s_ctrl = imx208_set_ctrl,
+};
+
+static const struct v4l2_ctrl_config imx208_digital_gain_control = {
+	.ops = &imx208_ctrl_ops,
+	.id = V4L2_CID_DIGITAL_GAIN,
+	.name = "Digital Gain",
+	.type = V4L2_CTRL_TYPE_INTEGER_MENU,
+	.min = 0,
+	.max = ARRAY_SIZE(imx208_discrete_digital_gain) - 1,
+	.step = 0,
+	.def = 0,
+	.menu_skip_mask = 0,
+	.qmenu_int = imx208_discrete_digital_gain,
+};
+
+static int imx208_enum_mbus_code(struct v4l2_subdev *sd,
+				 struct v4l2_subdev_pad_config *cfg,
+				 struct v4l2_subdev_mbus_code_enum *code)
+{
+	struct imx208 *imx208 = to_imx208(sd);
+
+	if (code->index > 0)
+		return -EINVAL;
+
+	code->code = imx208_get_format_code(imx208);
+
+	return 0;
+}
+
+static int imx208_enum_frame_size(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_pad_config *cfg,
+				  struct v4l2_subdev_frame_size_enum *fse)
+{
+	struct imx208 *imx208 = to_imx208(sd);
+
+	if (fse->index >= ARRAY_SIZE(supported_modes))
+		return -EINVAL;
+
+	if (fse->code != imx208_get_format_code(imx208))
+		return -EINVAL;
+
+	fse->min_width = supported_modes[fse->index].width;
+	fse->max_width = fse->min_width;
+	fse->min_height = supported_modes[fse->index].height;
+	fse->max_height = fse->min_height;
+
+	return 0;
+}
+
+static void imx208_mode_to_pad_format(struct imx208 *imx208,
+				      const struct imx208_mode *mode,
+				      struct v4l2_subdev_format *fmt)
+{
+	fmt->format.width = mode->width;
+	fmt->format.height = mode->height;
+	fmt->format.code = imx208_get_format_code(imx208);
+	fmt->format.field = V4L2_FIELD_NONE;
+}
+
+static int __imx208_get_pad_format(struct imx208 *imx208,
+				   struct v4l2_subdev_pad_config *cfg,
+				   struct v4l2_subdev_format *fmt)
+{
+	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
+		fmt->format = *v4l2_subdev_get_try_format(&imx208->sd, cfg,
+							  fmt->pad);
+	else
+		imx208_mode_to_pad_format(imx208, imx208->cur_mode, fmt);
+
+	return 0;
+}
+
+static int imx208_get_pad_format(struct v4l2_subdev *sd,
+				 struct v4l2_subdev_pad_config *cfg,
+				 struct v4l2_subdev_format *fmt)
+{
+	struct imx208 *imx208 = to_imx208(sd);
+	int ret;
+
+	mutex_lock(&imx208->imx208_mx);
+	ret = __imx208_get_pad_format(imx208, cfg, fmt);
+	mutex_unlock(&imx208->imx208_mx);
+
+	return ret;
+}
+
+static int imx208_set_pad_format(struct v4l2_subdev *sd,
+				 struct v4l2_subdev_pad_config *cfg,
+				 struct v4l2_subdev_format *fmt)
+{
+	struct imx208 *imx208 = to_imx208(sd);
+	const struct imx208_mode *mode;
+	s32 vblank_def;
+	s32 vblank_min;
+	s64 h_blank;
+	s64 pixel_rate;
+	s64 link_freq;
+
+	mutex_lock(&imx208->imx208_mx);
+
+	fmt->format.code = imx208_get_format_code(imx208);
+	mode = v4l2_find_nearest_size(supported_modes,
+				      ARRAY_SIZE(supported_modes), width, height,
+				      fmt->format.width, fmt->format.height);
+	imx208_mode_to_pad_format(imx208, mode, fmt);
+	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
+		*v4l2_subdev_get_try_format(sd, cfg, fmt->pad) = fmt->format;
+	} else {
+		imx208->cur_mode = mode;
+		__v4l2_ctrl_s_ctrl(imx208->link_freq, mode->link_freq_index);
+		link_freq = link_freq_menu_items[mode->link_freq_index];
+		pixel_rate = link_freq_to_pixel_rate(link_freq);
+		__v4l2_ctrl_s_ctrl_int64(imx208->pixel_rate, pixel_rate);
+		/* Update limits and set FPS to default */
+		vblank_def = imx208->cur_mode->vts_def -
+			     imx208->cur_mode->height;
+		vblank_min = imx208->cur_mode->vts_min -
+			     imx208->cur_mode->height;
+		__v4l2_ctrl_modify_range(imx208->vblank, vblank_min,
+					 IMX208_VTS_MAX - imx208->cur_mode->height,
+					 1, vblank_def);
+		__v4l2_ctrl_s_ctrl(imx208->vblank, vblank_def);
+		h_blank =
+			link_freq_configs[mode->link_freq_index].pixels_per_line
+			 - imx208->cur_mode->width;
+		__v4l2_ctrl_modify_range(imx208->hblank, h_blank,
+					 h_blank, 1, h_blank);
+	}
+
+	mutex_unlock(&imx208->imx208_mx);
+
+	return 0;
+}
+
+/* Start streaming */
+static int imx208_start_streaming(struct imx208 *imx208)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
+	const struct imx208_reg_list *reg_list;
+	int ret, link_freq_index;
+
+	/* Setup PLL */
+	link_freq_index = imx208->cur_mode->link_freq_index;
+	reg_list = &link_freq_configs[link_freq_index].reg_list;
+	ret = imx208_write_regs(imx208, reg_list->regs, reg_list->num_of_regs);
+	if (ret) {
+		dev_err(&client->dev, "%s failed to set plls\n", __func__);
+		return ret;
+	}
+
+	/* Apply default values of current mode */
+	reg_list = &imx208->cur_mode->reg_list;
+	ret = imx208_write_regs(imx208, reg_list->regs, reg_list->num_of_regs);
+	if (ret) {
+		dev_err(&client->dev, "%s failed to set mode\n", __func__);
+		return ret;
+	}
+
+	/* Apply customized values from user */
+	ret =  __v4l2_ctrl_handler_setup(imx208->sd.ctrl_handler);
+	if (ret)
+		return ret;
+
+	/* set stream on register */
+	return imx208_write_reg(imx208, IMX208_REG_MODE_SELECT,
+				1, IMX208_MODE_STREAMING);
+}
+
+/* Stop streaming */
+static int imx208_stop_streaming(struct imx208 *imx208)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
+	int ret;
+
+	/* set stream off register */
+	ret = imx208_write_reg(imx208, IMX208_REG_MODE_SELECT,
+			       1, IMX208_MODE_STANDBY);
+	if (ret)
+		dev_err(&client->dev, "%s failed to set stream\n", __func__);
+
+	/*
+	 * Return success even if it was an error, as there is nothing the
+	 * caller can do about it.
+	 */
+	return 0;
+}
+
+static int imx208_set_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct imx208 *imx208 = to_imx208(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	int ret = 0;
+
+	mutex_lock(&imx208->imx208_mx);
+	if (imx208->streaming == enable) {
+		mutex_unlock(&imx208->imx208_mx);
+		return 0;
+	}
+
+	if (enable) {
+		ret = pm_runtime_get_sync(&client->dev);
+		if (ret < 0)
+			goto err_rpm_put;
+
+		/*
+		 * Apply default & customized values
+		 * and then start streaming.
+		 */
+		ret = imx208_start_streaming(imx208);
+		if (ret)
+			goto err_rpm_put;
+	} else {
+		imx208_stop_streaming(imx208);
+		pm_runtime_put(&client->dev);
+	}
+
+	imx208->streaming = enable;
+	mutex_unlock(&imx208->imx208_mx);
+
+	/* vflip and hflip cannot change during streaming */
+	v4l2_ctrl_grab(imx208->vflip, enable);
+	v4l2_ctrl_grab(imx208->hflip, enable);
+
+	return ret;
+
+err_rpm_put:
+	pm_runtime_put(&client->dev);
+	mutex_unlock(&imx208->imx208_mx);
+
+	return ret;
+}
+
+static int __maybe_unused imx208_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct imx208 *imx208 = to_imx208(sd);
+
+	if (imx208->streaming)
+		imx208_stop_streaming(imx208);
+
+	return 0;
+}
+
+static int __maybe_unused imx208_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct imx208 *imx208 = to_imx208(sd);
+	int ret;
+
+	if (imx208->streaming) {
+		ret = imx208_start_streaming(imx208);
+		if (ret)
+			goto error;
+	}
+
+	return 0;
+
+error:
+	imx208_stop_streaming(imx208);
+	imx208->streaming = 0;
+
+	return ret;
+}
+
+/* Verify chip ID */
+static int imx208_identify_module(struct imx208 *imx208)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
+	int ret;
+	u32 val;
+
+	ret = imx208_read_reg(imx208, IMX208_REG_CHIP_ID,
+			      2, &val);
+	if (ret) {
+		dev_err(&client->dev, "failed to read chip id %x\n",
+			IMX208_CHIP_ID);
+		return ret;
+	}
+
+	if (val != IMX208_CHIP_ID) {
+		dev_err(&client->dev, "chip id mismatch: %x!=%x\n",
+			IMX208_CHIP_ID, val);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static const struct v4l2_subdev_video_ops imx208_video_ops = {
+	.s_stream = imx208_set_stream,
+};
+
+static const struct v4l2_subdev_pad_ops imx208_pad_ops = {
+	.enum_mbus_code = imx208_enum_mbus_code,
+	.get_fmt = imx208_get_pad_format,
+	.set_fmt = imx208_set_pad_format,
+	.enum_frame_size = imx208_enum_frame_size,
+};
+
+static const struct v4l2_subdev_ops imx208_subdev_ops = {
+	.video = &imx208_video_ops,
+	.pad = &imx208_pad_ops,
+};
+
+static const struct v4l2_subdev_internal_ops imx208_internal_ops = {
+	.open = imx208_open,
+};
+
+static int imx208_read_otp(struct imx208 *imx208)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
+	struct i2c_msg msgs[2];
+	u8 addr_buf[2] = { IMX208_OTP_BASE >> 8, IMX208_OTP_BASE & 0xff };
+	int ret = 0;
+
+	mutex_lock(&imx208->imx208_mx);
+
+	if (imx208->otp_read)
+		goto out_unlock;
+
+	ret = pm_runtime_get_sync(&client->dev);
+	if (ret < 0) {
+		pm_runtime_put_noidle(&client->dev);
+		goto out_unlock;
+	}
+
+	/* Write register address */
+	msgs[0].addr = client->addr;
+	msgs[0].flags = 0;
+	msgs[0].len = ARRAY_SIZE(addr_buf);
+	msgs[0].buf = addr_buf;
+
+	/* Read data from registers */
+	msgs[1].addr = client->addr;
+	msgs[1].flags = I2C_M_RD;
+	msgs[1].len = sizeof(imx208->otp_data);
+	msgs[1].buf = imx208->otp_data;
+
+	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+	if (ret == ARRAY_SIZE(msgs)) {
+		imx208->otp_read = true;
+		ret = 0;
+	}
+
+	pm_runtime_put(&client->dev);
+
+out_unlock:
+	mutex_unlock(&imx208->imx208_mx);
+
+	return ret;
+}
+
+static ssize_t otp_read(struct file *filp, struct kobject *kobj,
+			struct bin_attribute *bin_attr,
+			char *buf, loff_t off, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(kobj_to_dev(kobj));
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct imx208 *imx208 = to_imx208(sd);
+	int ret;
+
+	ret = imx208_read_otp(imx208);
+	if (ret)
+		return ret;
+
+	memcpy(buf, &imx208->otp_data[off], count);
+	return count;
+}
+
+static const BIN_ATTR_RO(otp, IMX208_OTP_SIZE);
+
+/* Initialize control handlers */
+static int imx208_init_controls(struct imx208 *imx208)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
+	struct v4l2_ctrl_handler *ctrl_hdlr = &imx208->ctrl_handler;
+	s64 exposure_max;
+	s64 vblank_def;
+	s64 vblank_min;
+	s64 pixel_rate_min;
+	s64 pixel_rate_max;
+	int ret;
+
+	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 8);
+	if (ret)
+		return ret;
+
+	mutex_init(&imx208->imx208_mx);
+	ctrl_hdlr->lock = &imx208->imx208_mx;
+	imx208->link_freq =
+		v4l2_ctrl_new_int_menu(ctrl_hdlr,
+				       &imx208_ctrl_ops,
+				       V4L2_CID_LINK_FREQ,
+				       ARRAY_SIZE(link_freq_menu_items) - 1,
+				       0, link_freq_menu_items);
+
+	if (imx208->link_freq)
+		imx208->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	pixel_rate_max = link_freq_to_pixel_rate(link_freq_menu_items[0]);
+	pixel_rate_min =
+		link_freq_to_pixel_rate(link_freq_menu_items[ARRAY_SIZE(link_freq_menu_items) - 1]);
+	/* By default, PIXEL_RATE is read only */
+	imx208->pixel_rate = v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops,
+					       V4L2_CID_PIXEL_RATE,
+					       pixel_rate_min, pixel_rate_max,
+					       1, pixel_rate_max);
+
+	vblank_def = imx208->cur_mode->vts_def - imx208->cur_mode->height;
+	vblank_min = imx208->cur_mode->vts_min - imx208->cur_mode->height;
+	imx208->vblank =
+		v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops, V4L2_CID_VBLANK,
+				  vblank_min,
+				  IMX208_VTS_MAX - imx208->cur_mode->height, 1,
+				  vblank_def);
+
+	imx208->hblank =
+		v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops, V4L2_CID_HBLANK,
+				  IMX208_PPL_384MHZ - imx208->cur_mode->width,
+				  IMX208_PPL_384MHZ - imx208->cur_mode->width,
+				  1,
+				  IMX208_PPL_384MHZ - imx208->cur_mode->width);
+
+	if (imx208->hblank)
+		imx208->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	exposure_max = imx208->cur_mode->vts_def - 8;
+	v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops, V4L2_CID_EXPOSURE,
+			  IMX208_EXPOSURE_MIN, exposure_max,
+			  IMX208_EXPOSURE_STEP, IMX208_EXPOSURE_DEFAULT);
+
+	imx208->hflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops,
+					  V4L2_CID_HFLIP, 0, 1, 1, 0);
+	imx208->vflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops,
+					  V4L2_CID_VFLIP, 0, 1, 1, 0);
+
+	v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops, V4L2_CID_ANALOGUE_GAIN,
+			  IMX208_ANA_GAIN_MIN, IMX208_ANA_GAIN_MAX,
+			  IMX208_ANA_GAIN_STEP, IMX208_ANA_GAIN_DEFAULT);
+
+	v4l2_ctrl_new_custom(ctrl_hdlr, &imx208_digital_gain_control, NULL);
+
+	v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &imx208_ctrl_ops,
+				     V4L2_CID_TEST_PATTERN,
+				     ARRAY_SIZE(imx208_test_pattern_menu) - 1,
+				     0, 0, imx208_test_pattern_menu);
+
+	if (ctrl_hdlr->error) {
+		ret = ctrl_hdlr->error;
+		dev_err(&client->dev, "%s control init failed (%d)\n",
+			__func__, ret);
+		goto error;
+	}
+
+	imx208->sd.ctrl_handler = ctrl_hdlr;
+
+	return 0;
+
+error:
+	v4l2_ctrl_handler_free(ctrl_hdlr);
+	mutex_destroy(&imx208->imx208_mx);
+
+	return ret;
+}
+
+static void imx208_free_controls(struct imx208 *imx208)
+{
+	v4l2_ctrl_handler_free(imx208->sd.ctrl_handler);
+}
+
+static int imx208_probe(struct i2c_client *client)
+{
+	struct imx208 *imx208;
+	int ret;
+	u32 val = 0;
+
+	device_property_read_u32(&client->dev, "clock-frequency", &val);
+	if (val != 19200000) {
+		dev_err(&client->dev,
+			"Unsupported clock-frequency %u. Expected 19200000.\n",
+			val);
+		return -EINVAL;
+	}
+
+	imx208 = devm_kzalloc(&client->dev, sizeof(*imx208), GFP_KERNEL);
+	if (!imx208)
+		return -ENOMEM;
+
+	/* Initialize subdev */
+	v4l2_i2c_subdev_init(&imx208->sd, client, &imx208_subdev_ops);
+
+	/* Check module identity */
+	ret = imx208_identify_module(imx208);
+	if (ret) {
+		dev_err(&client->dev, "failed to find sensor: %d", ret);
+		goto error_probe;
+	}
+
+	/* Set default mode to max resolution */
+	imx208->cur_mode = &supported_modes[0];
+
+	ret = imx208_init_controls(imx208);
+	if (ret) {
+		dev_err(&client->dev, "failed to init controls: %d", ret);
+		goto error_probe;
+	}
+
+	/* Initialize subdev */
+	imx208->sd.internal_ops = &imx208_internal_ops;
+	imx208->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	imx208->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
+
+	/* Initialize source pad */
+	imx208->pad.flags = MEDIA_PAD_FL_SOURCE;
+	ret = media_entity_pads_init(&imx208->sd.entity, 1, &imx208->pad);
+	if (ret) {
+		dev_err(&client->dev, "%s failed:%d\n", __func__, ret);
+		goto error_handler_free;
+	}
+
+	ret = v4l2_async_register_subdev_sensor(&imx208->sd);
+	if (ret < 0)
+		goto error_media_entity;
+
+	ret = device_create_bin_file(&client->dev, &bin_attr_otp);
+	if (ret) {
+		dev_err(&client->dev, "sysfs otp creation failed\n");
+		goto error_async_subdev;
+	}
+
+	pm_runtime_set_active(&client->dev);
+	pm_runtime_enable(&client->dev);
+	pm_runtime_idle(&client->dev);
+
+	return 0;
+
+error_async_subdev:
+	v4l2_async_unregister_subdev(&imx208->sd);
+
+error_media_entity:
+	media_entity_cleanup(&imx208->sd.entity);
+
+error_handler_free:
+	imx208_free_controls(imx208);
+
+error_probe:
+	mutex_destroy(&imx208->imx208_mx);
+
+	return ret;
+}
+
+static int imx208_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct imx208 *imx208 = to_imx208(sd);
+
+	device_remove_bin_file(&client->dev, &bin_attr_otp);
+	v4l2_async_unregister_subdev(sd);
+	media_entity_cleanup(&sd->entity);
+	imx208_free_controls(imx208);
+
+	pm_runtime_disable(&client->dev);
+	pm_runtime_set_suspended(&client->dev);
+
+	mutex_destroy(&imx208->imx208_mx);
+
+	return 0;
+}
+
+static const struct dev_pm_ops imx208_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(imx208_suspend, imx208_resume)
+};
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id imx208_acpi_ids[] = {
+	{ "INT3478" },
+	{ /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(acpi, imx208_acpi_ids);
+#endif
+
+static struct i2c_driver imx208_i2c_driver = {
+	.driver = {
+		.name = "imx208",
+		.pm = &imx208_pm_ops,
+		.acpi_match_table = ACPI_PTR(imx208_acpi_ids),
+	},
+	.probe_new = imx208_probe,
+	.remove = imx208_remove,
+};
+
+module_i2c_driver(imx208_i2c_driver);
+
+MODULE_AUTHOR("Yeh, Andy <andy.yeh@intel.com>");
+MODULE_AUTHOR("Chen, Ping-chung <ping-chung.chen@intel.com>");
+MODULE_AUTHOR("Shawn Tu <shawnx.tu@intel.com>");
+MODULE_DESCRIPTION("Sony IMX208 sensor driver");
+MODULE_LICENSE("GPL v2");