drivers/media/dvb-frontends/stv0288.c

Source file repositories/reference/linux-study-clean/drivers/media/dvb-frontends/stv0288.c

File Facts

System
Linux kernel
Corpus path
drivers/media/dvb-frontends/stv0288.c
Extension
.c
Size
13043 bytes
Lines
606
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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 stv0288_state {
	struct i2c_adapter *i2c;
	const struct stv0288_config *config;
	struct dvb_frontend frontend;

	u8 initialised:1;
	u32 tuner_frequency;
	u32 symbol_rate;
	enum fe_code_rate fec_inner;
	int errmode;
};

#define STATUS_BER 0
#define STATUS_UCBLOCKS 1

static int debug;
static int debug_legacy_dish_switch;
#define dprintk(args...) \
	do { \
		if (debug) \
			printk(KERN_DEBUG "stv0288: " args); \
	} while (0)


static int stv0288_writeregI(struct stv0288_state *state, u8 reg, u8 data)
{
	int ret;
	u8 buf[] = { reg, data };
	struct i2c_msg msg = {
		.addr = state->config->demod_address,
		.flags = 0,
		.buf = buf,
		.len = 2
	};

	ret = i2c_transfer(state->i2c, &msg, 1);

	if (ret != 1)
		dprintk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
			__func__, reg, data, ret);

	return (ret != 1) ? -EREMOTEIO : 0;
}

static int stv0288_write(struct dvb_frontend *fe, const u8 buf[], int len)
{
	struct stv0288_state *state = fe->demodulator_priv;

	if (len != 2)
		return -EINVAL;

	return stv0288_writeregI(state, buf[0], buf[1]);
}

static u8 stv0288_readreg(struct stv0288_state *state, u8 reg)
{
	int ret;
	u8 b0[] = { reg };
	u8 b1[] = { 0 };
	struct i2c_msg msg[] = {
		{
			.addr = state->config->demod_address,
			.flags = 0,
			.buf = b0,
			.len = 1
		}, {
			.addr = state->config->demod_address,
			.flags = I2C_M_RD,
			.buf = b1,
			.len = 1
		}
	};

	ret = i2c_transfer(state->i2c, msg, 2);

	if (ret != 2)
		dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n",
				__func__, reg, ret);

	return b1[0];
}

static int stv0288_set_symbolrate(struct dvb_frontend *fe, u32 srate)
{
	struct stv0288_state *state = fe->demodulator_priv;
	unsigned int temp;
	unsigned char b[3];

	if ((srate < 1000000) || (srate > 45000000))
		return -EINVAL;

Annotation

Implementation Notes