drivers/media/usb/ttusb-budget/dvb-ttusb-budget.c

Source file repositories/reference/linux-study-clean/drivers/media/usb/ttusb-budget/dvb-ttusb-budget.c

File Facts

System
Linux kernel
Corpus path
drivers/media/usb/ttusb-budget/dvb-ttusb-budget.c
Extension
.c
Size
42104 bytes
Lines
1769
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern 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

static const struct file_operations stc_fops = {
	.owner = THIS_MODULE,
	.read = stc_read,
	.open = stc_open,
	.release = stc_release,
};
#endif

static u32 functionality(struct i2c_adapter *adapter)
{
	return I2C_FUNC_I2C;
}



static int alps_tdmb7_tuner_set_params(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct ttusb* ttusb = (struct ttusb*) fe->dvb->priv;
	u8 data[4];
	struct i2c_msg msg = {.addr=0x61, .flags=0, .buf=data, .len=sizeof(data) };
	u32 div;

	div = (p->frequency + 36166667) / 166667;

	data[0] = (div >> 8) & 0x7f;
	data[1] = div & 0xff;
	data[2] = ((div >> 10) & 0x60) | 0x85;
	data[3] = p->frequency < 592000000 ? 0x40 : 0x80;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);
	if (i2c_transfer(&ttusb->i2c_adap, &msg, 1) != 1) return -EIO;
	return 0;
}

static struct cx22700_config alps_tdmb7_config = {
	.demod_address = 0x43,
};





static int philips_tdm1316l_tuner_init(struct dvb_frontend* fe)
{
	struct ttusb* ttusb = (struct ttusb*) fe->dvb->priv;
	static u8 td1316_init[] = { 0x0b, 0xf5, 0x85, 0xab };
	static u8 disable_mc44BC374c[] = { 0x1d, 0x74, 0xa0, 0x68 };
	struct i2c_msg tuner_msg = { .addr=0x60, .flags=0, .buf=td1316_init, .len=sizeof(td1316_init) };

	// setup PLL configuration
	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);
	if (i2c_transfer(&ttusb->i2c_adap, &tuner_msg, 1) != 1) return -EIO;
	msleep(1);

	// disable the mc44BC374c (do not check for errors)
	tuner_msg.addr = 0x65;
	tuner_msg.buf = disable_mc44BC374c;
	tuner_msg.len = sizeof(disable_mc44BC374c);
	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);
	if (i2c_transfer(&ttusb->i2c_adap, &tuner_msg, 1) != 1) {
		i2c_transfer(&ttusb->i2c_adap, &tuner_msg, 1);
	}

	return 0;
}

static int philips_tdm1316l_tuner_set_params(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct ttusb* ttusb = (struct ttusb*) fe->dvb->priv;
	u8 tuner_buf[4];
	struct i2c_msg tuner_msg = {.addr=0x60, .flags=0, .buf=tuner_buf, .len=sizeof(tuner_buf) };
	int tuner_frequency = 0;
	u8 band, cp, filter;

	// determine charge pump
	tuner_frequency = p->frequency + 36130000;
	if (tuner_frequency < 87000000) return -EINVAL;
	else if (tuner_frequency < 130000000) cp = 3;
	else if (tuner_frequency < 160000000) cp = 5;
	else if (tuner_frequency < 200000000) cp = 6;
	else if (tuner_frequency < 290000000) cp = 3;
	else if (tuner_frequency < 420000000) cp = 5;
	else if (tuner_frequency < 480000000) cp = 6;
	else if (tuner_frequency < 620000000) cp = 3;
	else if (tuner_frequency < 830000000) cp = 5;

Annotation

Implementation Notes