media: i2c: add lt6911uxe hdmi bridge driver (e49563c3) · Commits · git / linux-net

drivers/media/i2c/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		@@ -1147,6 +1147,17 @@ config VIDEO_ISL7998X
		Support for Intersil ISL7998x analog to MIPI-CSI2 or
		BT.656 decoder.

		config VIDEO_LT6911UXE
		tristate "Lontium LT6911UXE decoder"
		depends on ACPI && VIDEO_DEV
		select V4L2_FWNODE
		help
		This is a Video4Linux2 sensor-level driver for the Lontium
		LT6911UXE HDMI to MIPI CSI-2 bridge.

		To compile this driver as a module, choose M here: the
		module will be called lt6911uxe.

		config VIDEO_KS0127
		tristate "KS0127 video decoder"
		depends on VIDEO_DEV && I2C

drivers/media/i2c/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -64,6 +64,7 @@ obj-$(CONFIG_VIDEO_ISL7998X) += isl7998x.o
		obj-$(CONFIG_VIDEO_KS0127) += ks0127.o
		obj-$(CONFIG_VIDEO_LM3560) += lm3560.o
		obj-$(CONFIG_VIDEO_LM3646) += lm3646.o
		obj-$(CONFIG_VIDEO_LT6911UXE) += lt6911uxe.o
		obj-$(CONFIG_VIDEO_M52790) += m52790.o
		obj-$(CONFIG_VIDEO_MAX9271_LIB) += max9271.o
		obj-$(CONFIG_VIDEO_MAX9286) += max9286.o

drivers/media/i2c/lt6911uxe.c

0 → 100644

+707 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		// Copyright (c) 2023 - 2025 Intel Corporation.

		#include <linux/acpi.h>
		#include <linux/delay.h>
		#include <linux/gpio/consumer.h>
		#include <linux/i2c.h>
		#include <linux/interrupt.h>
		#include <linux/module.h>
		#include <linux/pm_runtime.h>
		#include <linux/regmap.h>
		#include <linux/v4l2-dv-timings.h>

		#include <media/v4l2-cci.h>
		#include <media/v4l2-ctrls.h>
		#include <media/v4l2-device.h>
		#include <media/v4l2-dv-timings.h>
		#include <media/v4l2-event.h>
		#include <media/v4l2-fwnode.h>

		#define LT6911UXE_CHIP_ID 0x2102
		#define REG_CHIP_ID CCI_REG16(0xe100)

		#define REG_ENABLE_I2C CCI_REG8(0xe0ee)
		#define REG_HALF_PIX_CLK CCI_REG24(0xe085)
		#define REG_BYTE_CLK CCI_REG24(0xe092)
		#define REG_HALF_H_TOTAL CCI_REG16(0xe088)
		#define REG_V_TOTAL CCI_REG16(0xe08a)
		#define REG_HALF_H_ACTIVE CCI_REG16(0xe08c)
		#define REG_V_ACTIVE CCI_REG16(0xe08e)
		#define REG_MIPI_FORMAT CCI_REG8(0xe096)
		#define REG_MIPI_TX_CTRL CCI_REG8(0xe0b0)

		/* Interrupts */
		#define REG_INT_HDMI CCI_REG8(0xe084)
		#define INT_VIDEO_DISAPPEAR 0x0
		#define INT_VIDEO_READY 0x1

		#define LT6911UXE_DEFAULT_LANES 4
		#define LT6911_PAGE_CONTROL 0xff
		#define YUV422_8_BIT 0x7

		static const struct v4l2_dv_timings_cap lt6911uxe_timings_cap_4kp30 = {
		.type = V4L2_DV_BT_656_1120,
		/* keep this initialization for compatibility with CLANG */
		.reserved = { 0 },
		/* Pixel clock from REF_01 p. 20. Min/max height/width are unknown */
		V4L2_INIT_BT_TIMINGS(160, 3840, /* min/max width */
		120, 2160, /* min/max height */
		50000000, 594000000, /* min/max pixelclock */
		V4L2_DV_BT_STD_CEA861 \| V4L2_DV_BT_STD_DMT \|
		V4L2_DV_BT_STD_CVT,
		V4L2_DV_BT_CAP_PROGRESSIVE \|
		V4L2_DV_BT_CAP_CUSTOM \|
		V4L2_DV_BT_CAP_REDUCED_BLANKING)
		};

		static const struct regmap_range_cfg lt6911uxe_ranges[] = {
		{
		.name = "register_range",
		.range_min = 0,
		.range_max = 0xffff,
		.selector_reg = LT6911_PAGE_CONTROL,
		.selector_mask = 0xff,
		.selector_shift = 0,
		.window_start = 0,
		.window_len = 0x100,
		},
		};

		static const struct regmap_config lt6911uxe_regmap_config = {
		.reg_bits = 8,
		.val_bits = 8,
		.max_register = 0xffff,
		.ranges = lt6911uxe_ranges,
		.num_ranges = ARRAY_SIZE(lt6911uxe_ranges),
		};

		struct lt6911uxe_mode {
		u32 width;
		u32 height;
		u32 htotal;
		u32 vtotal;
		u32 code;
		u32 fps;
		u32 lanes;
		s64 link_freq;
		u64 pixel_clk;
		};

		struct lt6911uxe {
		struct v4l2_subdev sd;
		struct media_pad pad;
		struct v4l2_ctrl_handler ctrl_handler;
		struct v4l2_ctrl *pixel_rate;
		struct v4l2_dv_timings timings;
		struct lt6911uxe_mode cur_mode;
		struct regmap *regmap;
		struct gpio_desc *reset_gpio;
		struct gpio_desc *irq_gpio;
		};

		static const struct v4l2_event lt6911uxe_ev_source_change = {
		.type = V4L2_EVENT_SOURCE_CHANGE,
		.u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION,
		};

		static inline struct lt6911uxe to_lt6911uxe(struct v4l2_subdev sd)
		{
		return container_of(sd, struct lt6911uxe, sd);
		}

		static s64 get_pixel_rate(struct lt6911uxe *lt6911uxe)
		{
		s64 pixel_rate;

		pixel_rate = (s64)lt6911uxe->cur_mode.width *
		lt6911uxe->cur_mode.height *
		lt6911uxe->cur_mode.fps * 16;
		do_div(pixel_rate, lt6911uxe->cur_mode.lanes);

		return pixel_rate;
		}

		static int lt6911uxe_get_detected_timings(struct v4l2_subdev *sd,
		struct v4l2_dv_timings *timings)
		{
		struct lt6911uxe *lt6911uxe = to_lt6911uxe(sd);
		struct v4l2_bt_timings *bt = &timings->bt;

		memset(timings, 0, sizeof(struct v4l2_dv_timings));

		timings->type = V4L2_DV_BT_656_1120;

		bt->width = lt6911uxe->cur_mode.width;
		bt->height = lt6911uxe->cur_mode.height;
		bt->vsync = lt6911uxe->cur_mode.vtotal - lt6911uxe->cur_mode.height;
		bt->hsync = lt6911uxe->cur_mode.htotal - lt6911uxe->cur_mode.width;
		bt->pixelclock = lt6911uxe->cur_mode.pixel_clk;

		return 0;
		}

		static int lt6911uxe_s_dv_timings(struct v4l2_subdev *sd, unsigned int pad,
		struct v4l2_dv_timings *timings)
		{
		struct lt6911uxe *lt6911uxe = to_lt6911uxe(sd);
		struct v4l2_subdev_state *state;

		state = v4l2_subdev_lock_and_get_active_state(sd);
		if (v4l2_match_dv_timings(&lt6911uxe->timings, timings, 0, false)) {
		v4l2_subdev_unlock_state(state);
		return 0;
		}

		if (!v4l2_valid_dv_timings(timings, &lt6911uxe_timings_cap_4kp30,
		NULL, NULL)) {
		v4l2_subdev_unlock_state(state);
		return -ERANGE;
		}
		lt6911uxe->timings = *timings;
		v4l2_subdev_unlock_state(state);

		return 0;
		}

		static int lt6911uxe_g_dv_timings(struct v4l2_subdev *sd, unsigned int pad,
		struct v4l2_dv_timings *timings)
		{
		struct lt6911uxe *lt6911uxe = to_lt6911uxe(sd);
		struct v4l2_subdev_state *state;

		state = v4l2_subdev_lock_and_get_active_state(sd);

		*timings = lt6911uxe->timings;
		v4l2_subdev_unlock_state(state);

		return 0;
		}

		static int lt6911uxe_query_dv_timings(struct v4l2_subdev *sd, unsigned int pad,
		struct v4l2_dv_timings *timings)
		{
		struct v4l2_subdev_state *state;
		int ret;

		state = v4l2_subdev_lock_and_get_active_state(sd);
		ret = lt6911uxe_get_detected_timings(sd, timings);
		if (ret) {
		v4l2_subdev_unlock_state(state);
		return ret;
		}

		if (!v4l2_valid_dv_timings(timings, &lt6911uxe_timings_cap_4kp30,
		NULL, NULL)) {
		v4l2_subdev_unlock_state(state);
		return -ERANGE;
		}

		v4l2_subdev_unlock_state(state);
		return 0;
		}

		static int lt6911uxe_enum_dv_timings(struct v4l2_subdev *sd,
		struct v4l2_enum_dv_timings *timings)
		{
		return v4l2_enum_dv_timings_cap(timings,
		&lt6911uxe_timings_cap_4kp30, NULL, NULL);
		}

		static int lt6911uxe_dv_timings_cap(struct v4l2_subdev *sd,
		struct v4l2_dv_timings_cap *cap)
		{
		*cap = lt6911uxe_timings_cap_4kp30;
		return 0;
		}

		static int lt6911uxe_status_update(struct lt6911uxe *lt6911uxe)
		{
		struct i2c_client *client = v4l2_get_subdevdata(&lt6911uxe->sd);
		u64 int_event;
		u64 byte_clk, half_pix_clk, fps, format;
		u64 half_htotal, vtotal, half_width, height;
		int ret = 0;

		/* Read interrupt event */
		cci_read(lt6911uxe->regmap, REG_INT_HDMI, &int_event, &ret);
		if (ret) {
		dev_err(&client->dev, "failed to read interrupt event: %d\n",
		ret);
		return ret;
		}

		switch (int_event) {
		case INT_VIDEO_READY:
		cci_read(lt6911uxe->regmap, REG_BYTE_CLK, &byte_clk, &ret);
		byte_clk *= 1000;
		cci_read(lt6911uxe->regmap, REG_HALF_PIX_CLK,
		&half_pix_clk, &ret);
		half_pix_clk *= 1000;

		if (ret \|\| byte_clk == 0 \|\| half_pix_clk == 0) {
		dev_dbg(&client->dev,
		"invalid ByteClock or PixelClock\n");
		return -EINVAL;
		}

		cci_read(lt6911uxe->regmap, REG_HALF_H_TOTAL,
		&half_htotal, &ret);
		cci_read(lt6911uxe->regmap, REG_V_TOTAL, &vtotal, &ret);
		if (ret \|\| half_htotal == 0 \|\| vtotal == 0) {
		dev_dbg(&client->dev, "invalid htotal or vtotal\n");
		return -EINVAL;
		}

		fps = div_u64(half_pix_clk, half_htotal * vtotal);
		if (fps > 60) {
		dev_dbg(&client->dev,
		"max fps is 60, current fps: %llu\n", fps);
		return -EINVAL;
		}

		cci_read(lt6911uxe->regmap, REG_HALF_H_ACTIVE,
		&half_width, &ret);
		cci_read(lt6911uxe->regmap, REG_V_ACTIVE, &height, &ret);
		if (ret \|\| half_width == 0 \|\| half_width * 2 > 3840 \|\|
		height == 0 \|\| height > 2160) {
		dev_dbg(&client->dev, "invalid width or height\n");
		return -EINVAL;
		}

		/*
		* Get MIPI format, YUV422_8_BIT is expected in lt6911uxe
		*/
		cci_read(lt6911uxe->regmap, REG_MIPI_FORMAT, &format, &ret);
		if (format != YUV422_8_BIT) {
		dev_dbg(&client->dev, "invalid MIPI format\n");
		return -EINVAL;
		}

		lt6911uxe->cur_mode.height = height;
		lt6911uxe->cur_mode.width = half_width * 2;
		lt6911uxe->cur_mode.fps = fps;
		/* MIPI Clock Rate = ByteClock × 4, defined in lt6911uxe spec */
		lt6911uxe->cur_mode.link_freq = byte_clk * 4;
		lt6911uxe->cur_mode.pixel_clk = half_pix_clk * 2;
		lt6911uxe->cur_mode.vtotal = vtotal;
		lt6911uxe->cur_mode.htotal = half_htotal * 2;
		break;

		case INT_VIDEO_DISAPPEAR:
		cci_write(lt6911uxe->regmap, REG_MIPI_TX_CTRL, 0x0, &ret);
		lt6911uxe->cur_mode.height = 0;
		lt6911uxe->cur_mode.width = 0;
		lt6911uxe->cur_mode.fps = 0;
		lt6911uxe->cur_mode.link_freq = 0;
		break;

		default:
		ret = -ENOLINK;
		}
		v4l2_subdev_notify_event(&lt6911uxe->sd, &lt6911uxe_ev_source_change);
		return ret;
		}

		static int lt6911uxe_init_controls(struct lt6911uxe *lt6911uxe)
		{
		struct v4l2_ctrl_handler *ctrl_hdlr;
		s64 pixel_rate;
		int ret;

		ctrl_hdlr = &lt6911uxe->ctrl_handler;
		ret = v4l2_ctrl_handler_init(ctrl_hdlr, 8);
		if (ret)
		return ret;

		pixel_rate = get_pixel_rate(lt6911uxe);
		lt6911uxe->pixel_rate = v4l2_ctrl_new_std(ctrl_hdlr, NULL,
		V4L2_CID_PIXEL_RATE,
		pixel_rate, pixel_rate, 1,
		pixel_rate);

		if (ctrl_hdlr->error) {
		ret = ctrl_hdlr->error;
		goto hdlr_free;
		}
		lt6911uxe->sd.ctrl_handler = ctrl_hdlr;

		return 0;

		hdlr_free:
		v4l2_ctrl_handler_free(ctrl_hdlr);
		return ret;
		}

		static void lt6911uxe_update_pad_format(const struct lt6911uxe_mode *mode,
		struct v4l2_mbus_framefmt *fmt)
		{
		fmt->width = mode->width;
		fmt->height = mode->height;
		fmt->code = mode->code;
		fmt->field = V4L2_FIELD_NONE;
		}

		static int lt6911uxe_enable_streams(struct v4l2_subdev *sd,
		struct v4l2_subdev_state *state,
		u32 pad, u64 streams_mask)
		{
		struct i2c_client *client = v4l2_get_subdevdata(sd);
		struct lt6911uxe *lt6911uxe = to_lt6911uxe(sd);
		int ret;

		ret = pm_runtime_resume_and_get(&client->dev);
		if (ret < 0)
		return ret;

		cci_write(lt6911uxe->regmap, REG_MIPI_TX_CTRL, 0x1, &ret);
		if (ret) {
		dev_err(&client->dev, "failed to start stream: %d\n", ret);
		goto err_rpm_put;
		}

		return 0;

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

		static int lt6911uxe_disable_streams(struct v4l2_subdev *sd,
		struct v4l2_subdev_state *state,
		u32 pad, u64 streams_mask)
		{
		struct lt6911uxe *lt6911uxe = to_lt6911uxe(sd);
		struct i2c_client *client = v4l2_get_subdevdata(&lt6911uxe->sd);
		int ret;

		ret = cci_write(lt6911uxe->regmap, REG_MIPI_TX_CTRL, 0x0, NULL);
		if (ret)
		dev_err(&client->dev, "failed to stop stream: %d\n", ret);

		pm_runtime_put(&client->dev);
		return 0;
		}

		static int lt6911uxe_set_format(struct v4l2_subdev *sd,
		struct v4l2_subdev_state *sd_state,
		struct v4l2_subdev_format *fmt)
		{
		struct lt6911uxe *lt6911uxe = to_lt6911uxe(sd);
		u64 pixel_rate;

		lt6911uxe_update_pad_format(&lt6911uxe->cur_mode, &fmt->format);
		*v4l2_subdev_state_get_format(sd_state, fmt->pad) = fmt->format;
		if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
		return 0;

		pixel_rate = get_pixel_rate(lt6911uxe);
		__v4l2_ctrl_modify_range(lt6911uxe->pixel_rate, pixel_rate,
		pixel_rate, 1, pixel_rate);

		return 0;
		}

		static int lt6911uxe_enum_mbus_code(struct v4l2_subdev *sd,
		struct v4l2_subdev_state *sd_state,
		struct v4l2_subdev_mbus_code_enum *code)
		{
		struct lt6911uxe *lt6911uxe = to_lt6911uxe(sd);

		if (code->index)
		return -EINVAL;

		code->code = lt6911uxe->cur_mode.code;

		return 0;
		}

		static int lt6911uxe_get_mbus_config(struct v4l2_subdev *sd,
		unsigned int pad,
		struct v4l2_mbus_config *cfg)
		{
		struct lt6911uxe *lt6911uxe = to_lt6911uxe(sd);
		struct v4l2_subdev_state *state;

		state = v4l2_subdev_lock_and_get_active_state(sd);
		cfg->type = V4L2_MBUS_CSI2_DPHY;
		cfg->link_freq = lt6911uxe->cur_mode.link_freq;
		v4l2_subdev_unlock_state(state);

		return 0;
		}

		static int lt6911uxe_init_state(struct v4l2_subdev *sd,
		struct v4l2_subdev_state *sd_state)
		{
		struct v4l2_subdev_format fmt = {
		.which = sd_state ? V4L2_SUBDEV_FORMAT_TRY
		: V4L2_SUBDEV_FORMAT_ACTIVE,
		};

		return lt6911uxe_set_format(sd, sd_state, &fmt);
		}

		static const struct v4l2_subdev_video_ops lt6911uxe_video_ops = {
		.s_stream = v4l2_subdev_s_stream_helper,
		};

		/*
		* lt6911uxe provides editable EDID for customers, but only can be edited like
		* updating flash. Due to this limitation, it is not possible to implement
		* EDID support.
		*/
		static const struct v4l2_subdev_pad_ops lt6911uxe_pad_ops = {
		.set_fmt = lt6911uxe_set_format,
		.get_fmt = v4l2_subdev_get_fmt,
		.enable_streams = lt6911uxe_enable_streams,
		.disable_streams = lt6911uxe_disable_streams,
		.enum_mbus_code = lt6911uxe_enum_mbus_code,
		.get_frame_interval = v4l2_subdev_get_frame_interval,
		.s_dv_timings = lt6911uxe_s_dv_timings,
		.g_dv_timings = lt6911uxe_g_dv_timings,
		.query_dv_timings = lt6911uxe_query_dv_timings,
		.enum_dv_timings = lt6911uxe_enum_dv_timings,
		.dv_timings_cap = lt6911uxe_dv_timings_cap,
		.get_mbus_config = lt6911uxe_get_mbus_config,
		};

		static const struct v4l2_subdev_core_ops lt6911uxe_subdev_core_ops = {
		.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
		.unsubscribe_event = v4l2_event_subdev_unsubscribe,
		};

		static const struct v4l2_subdev_ops lt6911uxe_subdev_ops = {
		.core = &lt6911uxe_subdev_core_ops,
		.video = &lt6911uxe_video_ops,
		.pad = &lt6911uxe_pad_ops,
		};

		static const struct media_entity_operations lt6911uxe_subdev_entity_ops = {
		.link_validate = v4l2_subdev_link_validate,
		};

		static const struct v4l2_subdev_internal_ops lt6911uxe_internal_ops = {
		.init_state = lt6911uxe_init_state,
		};

		static int lt6911uxe_fwnode_parse(struct lt6911uxe *lt6911uxe,
		struct device *dev)
		{
		struct fwnode_handle *endpoint;
		struct v4l2_fwnode_endpoint bus_cfg = {
		.bus_type = V4L2_MBUS_CSI2_DPHY,
		};
		int ret;

		endpoint = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), 0, 0,
		FWNODE_GRAPH_ENDPOINT_NEXT);
		if (!endpoint)
		return dev_err_probe(dev, -EPROBE_DEFER,
		"endpoint node not found\n");

		ret = v4l2_fwnode_endpoint_parse(endpoint, &bus_cfg);
		fwnode_handle_put(endpoint);
		if (ret) {
		dev_err(dev, "failed to parse endpoint node: %d\n", ret);
		goto out_err;
		}

		/*
		* Check the number of MIPI CSI2 data lanes,
		* lt6911uxe only support 4 lanes.
		*/
		if (bus_cfg.bus.mipi_csi2.num_data_lanes != LT6911UXE_DEFAULT_LANES) {
		dev_err(dev, "only 4 data lanes are currently supported\n");
		ret = -EINVAL;
		goto out_err;
		}
		lt6911uxe->cur_mode.lanes = bus_cfg.bus.mipi_csi2.num_data_lanes;
		lt6911uxe->cur_mode.code = MEDIA_BUS_FMT_UYVY8_1X16;

		return 0;

		out_err:
		v4l2_fwnode_endpoint_free(&bus_cfg);
		return ret;
		}

		static int lt6911uxe_identify_module(struct lt6911uxe *lt6911uxe,
		struct device *dev)
		{
		u64 val;
		int ret = 0;

		/* Chip ID should be confirmed when the I2C slave is active */
		cci_write(lt6911uxe->regmap, REG_ENABLE_I2C, 0x1, &ret);
		cci_read(lt6911uxe->regmap, REG_CHIP_ID, &val, &ret);
		cci_write(lt6911uxe->regmap, REG_ENABLE_I2C, 0x0, &ret);
		if (ret)
		return dev_err_probe(dev, ret, "fail to read chip id\n");

		if (val != LT6911UXE_CHIP_ID) {
		return dev_err_probe(dev, -ENXIO, "chip id mismatch: %x!=%x\n",
		LT6911UXE_CHIP_ID, (u16)val);
		}

		return 0;
		}

		static irqreturn_t lt6911uxe_threaded_irq_fn(int irq, void *dev_id)
		{
		struct v4l2_subdev *sd = dev_id;
		struct lt6911uxe *lt6911uxe = to_lt6911uxe(sd);
		struct v4l2_subdev_state *state;
		struct v4l2_subdev_format fmt = {
		.which = V4L2_SUBDEV_FORMAT_ACTIVE
		};

		lt6911uxe_status_update(lt6911uxe);
		state = v4l2_subdev_lock_and_get_active_state(sd);
		/*
		* As a HDMI to CSI2 bridge, it needs to update the format in time
		* when the HDMI source changes.
		*/
		lt6911uxe_set_format(sd, state, &fmt);
		v4l2_subdev_unlock_state(state);

		return IRQ_HANDLED;
		}

		static void lt6911uxe_remove(struct i2c_client *client)
		{
		struct v4l2_subdev *sd = i2c_get_clientdata(client);
		struct lt6911uxe *lt6911uxe = to_lt6911uxe(sd);

		free_irq(gpiod_to_irq(lt6911uxe->irq_gpio), lt6911uxe);
		v4l2_async_unregister_subdev(sd);
		v4l2_subdev_cleanup(sd);
		media_entity_cleanup(&sd->entity);
		v4l2_ctrl_handler_free(&lt6911uxe->ctrl_handler);
		pm_runtime_disable(&client->dev);
		pm_runtime_set_suspended(&client->dev);
		}

		static int lt6911uxe_probe(struct i2c_client *client)
		{
		struct lt6911uxe *lt6911uxe;
		struct device *dev = &client->dev;
		int ret;

		lt6911uxe = devm_kzalloc(dev, sizeof(*lt6911uxe), GFP_KERNEL);
		if (!lt6911uxe)
		return -ENOMEM;

		lt6911uxe->regmap = devm_regmap_init_i2c(client,
		&lt6911uxe_regmap_config);
		if (IS_ERR(lt6911uxe->regmap))
		return dev_err_probe(dev, PTR_ERR(lt6911uxe->regmap),
		"failed to init CCI\n");

		v4l2_i2c_subdev_init(&lt6911uxe->sd, client, &lt6911uxe_subdev_ops);

		lt6911uxe->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_IN);
		if (IS_ERR(lt6911uxe->reset_gpio))
		return dev_err_probe(dev, PTR_ERR(lt6911uxe->reset_gpio),
		"failed to get reset gpio\n");

		lt6911uxe->irq_gpio = devm_gpiod_get(dev, "readystat", GPIOD_IN);
		if (IS_ERR(lt6911uxe->irq_gpio))
		return dev_err_probe(dev, PTR_ERR(lt6911uxe->irq_gpio),
		"failed to get ready_stat gpio\n");

		ret = lt6911uxe_fwnode_parse(lt6911uxe, dev);
		if (ret)
		return ret;

		usleep_range(10000, 10500);

		ret = lt6911uxe_identify_module(lt6911uxe, dev);
		if (ret)
		return dev_err_probe(dev, ret, "failed to find chip\n");

		ret = lt6911uxe_init_controls(lt6911uxe);
		if (ret)
		return dev_err_probe(dev, ret, "failed to init control\n");

		lt6911uxe->sd.dev = dev;
		lt6911uxe->sd.internal_ops = &lt6911uxe_internal_ops;
		lt6911uxe->sd.flags \|= V4L2_SUBDEV_FL_HAS_DEVNODE;
		lt6911uxe->sd.entity.ops = &lt6911uxe_subdev_entity_ops;
		lt6911uxe->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
		lt6911uxe->pad.flags = MEDIA_PAD_FL_SOURCE;
		ret = media_entity_pads_init(&lt6911uxe->sd.entity, 1, &lt6911uxe->pad);
		if (ret) {
		dev_err(dev, "failed to init entity pads: %d\n", ret);
		goto v4l2_ctrl_handler_free;
		}

		/*
		* Device is already turned on by i2c-core with ACPI domain PM.
		* Enable runtime PM and turn off the device.
		*/
		pm_runtime_set_active(dev);
		pm_runtime_enable(dev);
		pm_runtime_idle(dev);

		ret = v4l2_subdev_init_finalize(&lt6911uxe->sd);
		if (ret) {
		dev_err(dev, "failed to init v4l2 subdev: %d\n", ret);
		goto media_entity_cleanup;
		}

		/* Setting irq */
		ret = request_threaded_irq(gpiod_to_irq(lt6911uxe->irq_gpio), NULL,
		lt6911uxe_threaded_irq_fn,
		IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING \|
		IRQF_ONESHOT, NULL, lt6911uxe);
		if (ret) {
		dev_err(dev, "failed to request IRQ: %d\n", ret);
		goto subdev_cleanup;
		}

		ret = v4l2_async_register_subdev_sensor(&lt6911uxe->sd);
		if (ret) {
		dev_err(dev, "failed to register V4L2 subdev: %d\n", ret);
		goto free_irq;
		}

		return 0;

		free_irq:
		free_irq(gpiod_to_irq(lt6911uxe->irq_gpio), lt6911uxe);

		subdev_cleanup:
		v4l2_subdev_cleanup(&lt6911uxe->sd);

		media_entity_cleanup:
		pm_runtime_disable(dev);
		pm_runtime_set_suspended(dev);
		media_entity_cleanup(&lt6911uxe->sd.entity);

		v4l2_ctrl_handler_free:
		v4l2_ctrl_handler_free(lt6911uxe->sd.ctrl_handler);

		return ret;
		}

		static const struct acpi_device_id lt6911uxe_acpi_ids[] = {
		{ "INTC10C5" },
		{}
		};
		MODULE_DEVICE_TABLE(acpi, lt6911uxe_acpi_ids);

		static struct i2c_driver lt6911uxe_i2c_driver = {
		.driver = {
		.name = "lt6911uxe",
		.acpi_match_table = ACPI_PTR(lt6911uxe_acpi_ids),
		},
		.probe = lt6911uxe_probe,
		.remove = lt6911uxe_remove,
		};

		module_i2c_driver(lt6911uxe_i2c_driver);

		MODULE_AUTHOR("Yan Dongcheng <dongcheng.yan@intel.com>");
		MODULE_DESCRIPTION("Lontium lt6911uxe HDMI to MIPI Bridge Driver");
		MODULE_LICENSE("GPL");