drivers/media/i2c/tw2804.c

Source file repositories/reference/linux-study-clean/drivers/media/i2c/tw2804.c

File Facts

System
Linux kernel
Corpus path
drivers/media/i2c/tw2804.c
Extension
.c
Size
10515 bytes
Lines
436
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 tw2804 {
	struct v4l2_subdev sd;
	struct v4l2_ctrl_handler hdl;
	u8 channel:2;
	u8 input:1;
	int norm;
};

static const u8 global_registers[] = {
	0x39, 0x00,
	0x3a, 0xff,
	0x3b, 0x84,
	0x3c, 0x80,
	0x3d, 0x80,
	0x3e, 0x82,
	0x3f, 0x82,
	0x78, 0x00,
	0xff, 0xff, /* Terminator (reg 0xff does not exist) */
};

static const u8 channel_registers[] = {
	0x01, 0xc4,
	0x02, 0xa5,
	0x03, 0x20,
	0x04, 0xd0,
	0x05, 0x20,
	0x06, 0xd0,
	0x07, 0x88,
	0x08, 0x20,
	0x09, 0x07,
	0x0a, 0xf0,
	0x0b, 0x07,
	0x0c, 0xf0,
	0x0d, 0x40,
	0x0e, 0xd2,
	0x0f, 0x80,
	0x10, 0x80,
	0x11, 0x80,
	0x12, 0x80,
	0x13, 0x1f,
	0x14, 0x00,
	0x15, 0x00,
	0x16, 0x00,
	0x17, 0x00,
	0x18, 0xff,
	0x19, 0xff,
	0x1a, 0xff,
	0x1b, 0xff,
	0x1c, 0xff,
	0x1d, 0xff,
	0x1e, 0xff,
	0x1f, 0xff,
	0x20, 0x07,
	0x21, 0x07,
	0x22, 0x00,
	0x23, 0x91,
	0x24, 0x51,
	0x25, 0x03,
	0x26, 0x00,
	0x27, 0x00,
	0x28, 0x00,
	0x29, 0x00,
	0x2a, 0x00,
	0x2b, 0x00,
	0x2c, 0x00,
	0x2d, 0x00,
	0x2e, 0x00,
	0x2f, 0x00,
	0x30, 0x00,
	0x31, 0x00,
	0x32, 0x00,
	0x33, 0x00,
	0x34, 0x00,
	0x35, 0x00,
	0x36, 0x00,
	0x37, 0x00,
	0xff, 0xff, /* Terminator (reg 0xff does not exist) */
};

static int write_reg(struct i2c_client *client, u8 reg, u8 value, u8 channel)
{
	return i2c_smbus_write_byte_data(client, reg | (channel << 6), value);
}

static int write_regs(struct i2c_client *client, const u8 *regs, u8 channel)
{
	int ret;
	int i;

	for (i = 0; regs[i] != 0xff; i += 2) {

Annotation

Implementation Notes