drivers/media/i2c/lt6911uxe.c - linux/kernel/git/tj/cgroup - Git at Google

 // 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");
	// 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");