drivers/media/dvb-frontends/stv0299.c

Source file repositories/reference/linux-study-clean/drivers/media/dvb-frontends/stv0299.c

File Facts

System
Linux kernel
Corpus path
drivers/media/dvb-frontends/stv0299.c
Extension
.c
Size
18152 bytes
Lines
756
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 stv0299_state {
	struct i2c_adapter* i2c;
	const struct stv0299_config* config;
	struct dvb_frontend frontend;

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

#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 "stv0299: " args); \
	} while (0)


static int stv0299_writeregI (struct stv0299_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 stv0299_write(struct dvb_frontend* fe, const u8 buf[], int len)
{
	struct stv0299_state* state = fe->demodulator_priv;

	if (len != 2)
		return -EINVAL;

	return stv0299_writeregI(state, buf[0], buf[1]);
}

static u8 stv0299_readreg (struct stv0299_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 stv0299_readregs (struct stv0299_state* state, u8 reg1, u8 *b, u8 len)
{
	int ret;
	struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = &reg1, .len = 1 },
			   { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b, .len = len } };

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

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

	return ret == 2 ? 0 : ret;
}

static int stv0299_set_FEC(struct stv0299_state *state, enum fe_code_rate fec)
{
	dprintk ("%s\n", __func__);

	switch (fec) {
	case FEC_AUTO:
	{
		return stv0299_writeregI (state, 0x31, 0x1f);
	}

Annotation

Implementation Notes