drivers/media/i2c/vp27smpx.c

Source file repositories/reference/linux-study-clean/drivers/media/i2c/vp27smpx.c

File Facts

System
Linux kernel
Corpus path
drivers/media/i2c/vp27smpx.c
Extension
.c
Size
4493 bytes
Lines
190
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 vp27smpx_state {
	struct v4l2_subdev sd;
	int radio;
	u32 audmode;
};

static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd)
{
	return container_of(sd, struct vp27smpx_state, sd);
}

static void vp27smpx_set_audmode(struct v4l2_subdev *sd, u32 audmode)
{
	struct vp27smpx_state *state = to_state(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	u8 data[3] = { 0x00, 0x00, 0x04 };

	switch (audmode) {
	case V4L2_TUNER_MODE_MONO:
	case V4L2_TUNER_MODE_LANG1:
		break;
	case V4L2_TUNER_MODE_STEREO:
	case V4L2_TUNER_MODE_LANG1_LANG2:
		data[1] = 0x01;
		break;
	case V4L2_TUNER_MODE_LANG2:
		data[1] = 0x02;
		break;
	}

	if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
		v4l2_err(sd, "I/O error setting audmode\n");
	else
		state->audmode = audmode;
}

static int vp27smpx_s_radio(struct v4l2_subdev *sd)
{
	struct vp27smpx_state *state = to_state(sd);

	state->radio = 1;
	return 0;
}

static int vp27smpx_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
{
	struct vp27smpx_state *state = to_state(sd);

	state->radio = 0;
	return 0;
}

static int vp27smpx_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *vt)
{
	struct vp27smpx_state *state = to_state(sd);

	if (!state->radio)
		vp27smpx_set_audmode(sd, vt->audmode);
	return 0;
}

static int vp27smpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
{
	struct vp27smpx_state *state = to_state(sd);

	if (state->radio)
		return 0;
	vt->audmode = state->audmode;
	vt->capability = V4L2_TUNER_CAP_STEREO |
		V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
	vt->rxsubchans = V4L2_TUNER_SUB_MONO;
	return 0;
}

static int vp27smpx_log_status(struct v4l2_subdev *sd)
{
	struct vp27smpx_state *state = to_state(sd);

	v4l2_info(sd, "Audio Mode: %u%s\n", state->audmode,
			state->radio ? " (Radio)" : "");
	return 0;
}

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

static const struct v4l2_subdev_core_ops vp27smpx_core_ops = {
	.log_status = vp27smpx_log_status,
};

static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = {

Annotation

Implementation Notes