diff options
| author | Antti Palosaari <crope@iki.fi> | 2007-02-10 10:19:11 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2007-02-21 13:35:24 -0200 |
| commit | f7f57770dc610eddd678aec483263e7980327ee9 (patch) | |
| tree | 50970397f8f0fd7c74d4da5f95c4135d4280b00f /drivers/media/dvb/frontends/zl10353.c | |
| parent | 0a11bb865a88a7459855ab46f74091e6ca4a1a20 (diff) | |
| download | lwn-f7f57770dc610eddd678aec483263e7980327ee9.tar.gz lwn-f7f57770dc610eddd678aec483263e7980327ee9.zip | |
V4L/DVB (5217): Zl10353: Implement TRL nominal rate calculation
Implement trl nominal rate calculation to Zarlink ZL10353 demod,
based on calculation used in Zarlink MT352.
This adds support for 6 and 8MHz bandwidth transponders.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Chris Pascoe <c.pascoe@itee.uq.edu.au>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers/media/dvb/frontends/zl10353.c')
| -rw-r--r-- | drivers/media/dvb/frontends/zl10353.c | 48 |
1 files changed, 45 insertions, 3 deletions
diff --git a/drivers/media/dvb/frontends/zl10353.c b/drivers/media/dvb/frontends/zl10353.c index 50dac2054353..dbb53ba6f414 100644 --- a/drivers/media/dvb/frontends/zl10353.c +++ b/drivers/media/dvb/frontends/zl10353.c @@ -38,6 +38,12 @@ struct zl10353_state { struct zl10353_config config; }; +static int debug; +#define dprintk(args...) \ + do { \ + if (debug) printk(KERN_DEBUG "zl10353: " args); \ + } while (0) + static int debug_regs = 0; static int zl10353_single_write(struct dvb_frontend *fe, u8 reg, u8 val) @@ -113,6 +119,36 @@ static void zl10353_dump_regs(struct dvb_frontend *fe) printk(KERN_DEBUG "%s\n", buf); } +static void zl10353_calc_nominal_rate(struct dvb_frontend *fe, + enum fe_bandwidth bandwidth, + u16 *nominal_rate) +{ + u32 adc_clock = 22528; /* 20.480 MHz on the board(!?) */ + u8 bw; + struct zl10353_state *state = fe->demodulator_priv; + + if (state->config.adc_clock) + adc_clock = state->config.adc_clock; + + switch (bandwidth) { + case BANDWIDTH_6_MHZ: + bw = 6; + break; + case BANDWIDTH_7_MHZ: + bw = 7; + break; + case BANDWIDTH_8_MHZ: + default: + bw = 8; + break; + } + + *nominal_rate = (64 * bw * (1<<16) / (7 * 8) * 4000 / adc_clock + 2) / 4; + + dprintk("%s: bw %d, adc_clock %d => 0x%x\n", + __FUNCTION__, bw, adc_clock, *nominal_rate); +} + static int zl10353_sleep(struct dvb_frontend *fe) { static u8 zl10353_softdown[] = { 0x50, 0x0C, 0x44 }; @@ -125,7 +161,7 @@ static int zl10353_set_parameters(struct dvb_frontend *fe, struct dvb_frontend_parameters *param) { struct zl10353_state *state = fe->demodulator_priv; - + u16 nominal_rate; u8 pllbuf[6] = { 0x67 }; /* These settings set "auto-everything" and start the FSM. */ @@ -138,8 +174,11 @@ static int zl10353_set_parameters(struct dvb_frontend *fe, zl10353_single_write(fe, 0x56, 0x28); zl10353_single_write(fe, 0x89, 0x20); zl10353_single_write(fe, 0x5E, 0x00); - zl10353_single_write(fe, 0x65, 0x5A); - zl10353_single_write(fe, 0x66, 0xE9); + + zl10353_calc_nominal_rate(fe, param->u.ofdm.bandwidth, &nominal_rate); + zl10353_single_write(fe, TRL_NOMINAL_RATE_1, msb(nominal_rate)); + zl10353_single_write(fe, TRL_NOMINAL_RATE_0, lsb(nominal_rate)); + zl10353_single_write(fe, 0x6C, 0xCD); zl10353_single_write(fe, 0x6D, 0x7E); if (fe->ops.i2c_gate_ctrl) @@ -377,6 +416,9 @@ static struct dvb_frontend_ops zl10353_ops = { .read_ucblocks = zl10353_read_ucblocks, }; +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); + module_param(debug_regs, int, 0644); MODULE_PARM_DESC(debug_regs, "Turn on/off frontend register dumps (default:off)."); |