drivers/media/i2c/saa6752hs.c

Source file repositories/reference/linux-study-clean/drivers/media/i2c/saa6752hs.c

File Facts

System
Linux kernel
Corpus path
drivers/media/i2c/saa6752hs.c
Extension
.c
Size
21140 bytes
Lines
788
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 saa6752hs_mpeg_params {
	/* transport streams */
	__u16				ts_pid_pmt;
	__u16				ts_pid_audio;
	__u16				ts_pid_video;
	__u16				ts_pid_pcr;

	/* audio */
	enum v4l2_mpeg_audio_encoding    au_encoding;
	enum v4l2_mpeg_audio_l2_bitrate  au_l2_bitrate;
	enum v4l2_mpeg_audio_ac3_bitrate au_ac3_bitrate;

	/* video */
	enum v4l2_mpeg_video_aspect	vi_aspect;
	enum v4l2_mpeg_video_bitrate_mode vi_bitrate_mode;
	__u32				vi_bitrate;
	__u32				vi_bitrate_peak;
};

static const struct v4l2_format v4l2_format_table[] =
{
	[SAA6752HS_VF_D1] =
		{ .fmt = { .pix = { .width = 720, .height = 576 }}},
	[SAA6752HS_VF_2_3_D1] =
		{ .fmt = { .pix = { .width = 480, .height = 576 }}},
	[SAA6752HS_VF_1_2_D1] =
		{ .fmt = { .pix = { .width = 352, .height = 576 }}},
	[SAA6752HS_VF_SIF] =
		{ .fmt = { .pix = { .width = 352, .height = 288 }}},
	[SAA6752HS_VF_UNKNOWN] =
		{ .fmt = { .pix = { .width = 0, .height = 0}}},
};

struct saa6752hs_state {
	struct v4l2_subdev            sd;
	struct v4l2_ctrl_handler      hdl;
	struct { /* video bitrate mode control cluster */
		struct v4l2_ctrl *video_bitrate_mode;
		struct v4l2_ctrl *video_bitrate;
		struct v4l2_ctrl *video_bitrate_peak;
	};
	u32			      revision;
	int			      has_ac3;
	struct saa6752hs_mpeg_params  params;
	enum saa6752hs_videoformat    video_format;
	v4l2_std_id                   standard;
};

enum saa6752hs_command {
	SAA6752HS_COMMAND_RESET = 0,
	SAA6752HS_COMMAND_STOP = 1,
	SAA6752HS_COMMAND_START = 2,
	SAA6752HS_COMMAND_PAUSE = 3,
	SAA6752HS_COMMAND_RECONFIGURE = 4,
	SAA6752HS_COMMAND_SLEEP = 5,
	SAA6752HS_COMMAND_RECONFIGURE_FORCE = 6,

	SAA6752HS_COMMAND_MAX
};

static inline struct saa6752hs_state *to_state(struct v4l2_subdev *sd)
{
	return container_of(sd, struct saa6752hs_state, sd);
}

/* ---------------------------------------------------------------------- */

static const u8 PAT[] = {
	0xc2, /* i2c register */
	0x00, /* table number for encoder */

	0x47, /* sync */
	0x40, 0x00, /* transport_error_indicator(0), payload_unit_start(1), transport_priority(0), pid(0) */
	0x10, /* transport_scrambling_control(00), adaptation_field_control(01), continuity_counter(0) */

	0x00, /* PSI pointer to start of table */

	0x00, /* tid(0) */
	0xb0, 0x0d, /* section_syntax_indicator(1), section_length(13) */

	0x00, 0x01, /* transport_stream_id(1) */

	0xc1, /* version_number(0), current_next_indicator(1) */

	0x00, 0x00, /* section_number(0), last_section_number(0) */

	0x00, 0x01, /* program_number(1) */

	0xe0, 0x00, /* PMT PID */

Annotation

Implementation Notes