drivers/media/dvb-frontends/bsru6.h

Source file repositories/reference/linux-study-clean/drivers/media/dvb-frontends/bsru6.h

File Facts

System
Linux kernel
Corpus path
drivers/media/dvb-frontends/bsru6.h
Extension
.h
Size
3113 bytes
Lines
127
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

#ifndef BSRU6_H
#define BSRU6_H

static u8 alps_bsru6_inittab[] = {
	0x01, 0x15,
	0x02, 0x30,
	0x03, 0x00,
	0x04, 0x7d,   /* F22FR = 0x7d, F22 = f_VCO / 128 / 0x7d = 22 kHz */
	0x05, 0x35,   /* I2CT = 0, SCLT = 1, SDAT = 1 */
	0x06, 0x40,   /* DAC not used, set to high impendance mode */
	0x07, 0x00,   /* DAC LSB */
	0x08, 0x40,   /* DiSEqC off, LNB power on OP2/LOCK pin on */
	0x09, 0x00,   /* FIFO */
	0x0c, 0x51,   /* OP1 ctl = Normal, OP1 val = 1 (LNB Power ON) */
	0x0d, 0x82,   /* DC offset compensation = ON, beta_agc1 = 2 */
	0x0e, 0x23,   /* alpha_tmg = 2, beta_tmg = 3 */
	0x10, 0x3f,   // AGC2  0x3d
	0x11, 0x84,
	0x12, 0xb9,
	0x15, 0xc9,   // lock detector threshold
	0x16, 0x00,
	0x17, 0x00,
	0x18, 0x00,
	0x19, 0x00,
	0x1a, 0x00,
	0x1f, 0x50,
	0x20, 0x00,
	0x21, 0x00,
	0x22, 0x00,
	0x23, 0x00,
	0x28, 0x00,  // out imp: normal  out type: parallel FEC mode:0
	0x29, 0x1e,  // 1/2 threshold
	0x2a, 0x14,  // 2/3 threshold
	0x2b, 0x0f,  // 3/4 threshold
	0x2c, 0x09,  // 5/6 threshold
	0x2d, 0x05,  // 7/8 threshold
	0x2e, 0x01,
	0x31, 0x1f,  // test all FECs
	0x32, 0x19,  // viterbi and synchro search
	0x33, 0xfc,  // rs control
	0x34, 0x93,  // error control
	0x0f, 0x52,
	0xff, 0xff
};

static int alps_bsru6_set_symbol_rate(struct dvb_frontend *fe, u32 srate, u32 ratio)
{
	u8 aclk = 0;
	u8 bclk = 0;

	if (srate < 1500000) {
		aclk = 0xb7;
		bclk = 0x47;
	} else if (srate < 3000000) {
		aclk = 0xb7;
		bclk = 0x4b;
	} else if (srate < 7000000) {
		aclk = 0xb7;
		bclk = 0x4f;
	} else if (srate < 14000000) {
		aclk = 0xb7;
		bclk = 0x53;
	} else if (srate < 30000000) {
		aclk = 0xb6;
		bclk = 0x53;
	} else if (srate < 45000000) {
		aclk = 0xb4;
		bclk = 0x51;
	}

	stv0299_writereg(fe, 0x13, aclk);
	stv0299_writereg(fe, 0x14, bclk);
	stv0299_writereg(fe, 0x1f, (ratio >> 16) & 0xff);
	stv0299_writereg(fe, 0x20, (ratio >> 8) & 0xff);
	stv0299_writereg(fe, 0x21, ratio & 0xf0);

	return 0;
}

static int alps_bsru6_tuner_set_params(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	u8 buf[4];
	u32 div;
	struct i2c_msg msg = { .addr = 0x61, .flags = 0, .buf = buf, .len = sizeof(buf) };
	struct i2c_adapter *i2c = fe->tuner_priv;

	if ((p->frequency < 950000) || (p->frequency > 2150000))
		return -EINVAL;

Annotation

Implementation Notes