drivers/media/i2c/lt6911uxe.c

Source file repositories/reference/linux-study-clean/drivers/media/i2c/lt6911uxe.c

File Facts

System
Linux kernel
Corpus path
drivers/media/i2c/lt6911uxe.c
Extension
.c
Size
19055 bytes
Lines
708
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

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)

Annotation

Implementation Notes