drivers/media/usb/gspca/mr97310a.c

Source file repositories/reference/linux-study-clean/drivers/media/usb/gspca/mr97310a.c

File Facts

System
Linux kernel
Corpus path
drivers/media/usb/gspca/mr97310a.c
Extension
.c
Size
30015 bytes
Lines
1078
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 sd {
	struct gspca_dev gspca_dev;  /* !! must be the first item */
	struct { /* exposure/min_clockdiv control cluster */
		struct v4l2_ctrl *exposure;
		struct v4l2_ctrl *min_clockdiv;
	};
	u8 sof_read;
	u8 cam_type;	/* 0 is CIF and 1 is VGA */
	u8 sensor_type;	/* We use 0 and 1 here, too. */
	u8 do_lcd_stop;
	u8 adj_colors;
};

struct sensor_w_data {
	u8 reg;
	u8 flags;
	u8 data[16];
	int len;
};

static void sd_stopN(struct gspca_dev *gspca_dev);

static const struct v4l2_pix_format vga_mode[] = {
	{160, 120, V4L2_PIX_FMT_MR97310A, V4L2_FIELD_NONE,
		.bytesperline = 160,
		.sizeimage = 160 * 120,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 4},
	{176, 144, V4L2_PIX_FMT_MR97310A, V4L2_FIELD_NONE,
		.bytesperline = 176,
		.sizeimage = 176 * 144,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 3},
	{320, 240, V4L2_PIX_FMT_MR97310A, V4L2_FIELD_NONE,
		.bytesperline = 320,
		.sizeimage = 320 * 240,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 2},
	{352, 288, V4L2_PIX_FMT_MR97310A, V4L2_FIELD_NONE,
		.bytesperline = 352,
		.sizeimage = 352 * 288,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 1},
	{640, 480, V4L2_PIX_FMT_MR97310A, V4L2_FIELD_NONE,
		.bytesperline = 640,
		.sizeimage = 640 * 480,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 0},
};

/* the bytes to write are in gspca_dev->usb_buf */
static int mr_write(struct gspca_dev *gspca_dev, int len)
{
	int rc;

	rc = usb_bulk_msg(gspca_dev->dev,
			  usb_sndbulkpipe(gspca_dev->dev, 4),
			  gspca_dev->usb_buf, len, NULL, 500);
	if (rc < 0)
		pr_err("reg write [%02x] error %d\n",
		       gspca_dev->usb_buf[0], rc);
	return rc;
}

/* the bytes are read into gspca_dev->usb_buf */
static int mr_read(struct gspca_dev *gspca_dev, int len)
{
	int rc;

	rc = usb_bulk_msg(gspca_dev->dev,
			  usb_rcvbulkpipe(gspca_dev->dev, 3),
			  gspca_dev->usb_buf, len, NULL, 500);
	if (rc < 0)
		pr_err("reg read [%02x] error %d\n",
		       gspca_dev->usb_buf[0], rc);
	return rc;
}

static int sensor_write_reg(struct gspca_dev *gspca_dev, u8 reg, u8 flags,
	const u8 *data, int len)
{
	gspca_dev->usb_buf[0] = 0x1f;
	gspca_dev->usb_buf[1] = flags;
	gspca_dev->usb_buf[2] = reg;
	memcpy(gspca_dev->usb_buf + 3, data, len);

	return mr_write(gspca_dev, len + 3);
}

static int sensor_write_regs(struct gspca_dev *gspca_dev,

Annotation

Implementation Notes