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V4L/DVB (9178): cx24116: Add module parameter to return SNR as ESNO.

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I've retained the older percentage code after discussing this with
Darron Broad, but made the ESNO option default.

Signed-off-by: Steven Toth <stoth@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Steven Toth 2008-10-06 21:20:21 -03:00 committed by Mauro Carvalho Chehab
parent 0a6393ae21
commit 8953db793d
1 changed files with 36 additions and 3 deletions
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39
drivers/media/dvb/frontends/cx24116.c
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@ -57,8 +57,9 @@ static int debug = 0;
#define CX24116_REG_RESET (0x20) /* reset status > 0 */
#define CX24116_REG_SIGNAL (0x9e) /* signal low */
#define CX24116_REG_SSTATUS (0x9d) /* signal high / status */
#define CX24116_REG_QUALITY8 (0xa3)
#define CX24116_REG_QSTATUS (0xbc)
#define CX24116_REG_QUALITY (0xd5)
#define CX24116_REG_QUALITY0 (0xd5)
#define CX24116_REG_BER0 (0xc9)
#define CX24116_REG_BER8 (0xc8)
#define CX24116_REG_BER16 (0xc7)
@ -116,6 +117,9 @@ static int debug = 0;
/* DiSEqC tone burst */
static int toneburst = 1;
/* SNR measurements */
static int esno_snr = 1;
enum cmds
{
CMD_SET_VCO = 0x10,
@ -703,7 +707,7 @@ static int cx24116_read_signal_strength(struct dvb_frontend* fe, u16* signal_str
}
/* SNR (0..100)% = (sig & 0xf0) * 10 + (sig & 0x0f) * 10 / 16 */
static int cx24116_read_snr(struct dvb_frontend* fe, u16* snr)
static int cx24116_read_snr_pct(struct dvb_frontend* fe, u16* snr)
{
struct cx24116_state *state = fe->demodulator_priv;
u8 snr_reading;
@ -714,7 +718,7 @@ static int cx24116_read_snr(struct dvb_frontend* fe, u16* snr)
dprintk("%s()\n", __func__);
snr_reading = cx24116_readreg(state, CX24116_REG_QUALITY);
snr_reading = cx24116_readreg(state, CX24116_REG_QUALITY0);
if(snr_reading >= 0xa0 /* 100% */)
*snr = 0xffff;
@ -728,6 +732,32 @@ static int cx24116_read_snr(struct dvb_frontend* fe, u16* snr)
return 0;
}
/* The reelbox patches show the value in the registers represents
* ESNO, from 0->30db (values 0->300). We provide this value by
* default.
*/
static int cx24116_read_snr_esno(struct dvb_frontend* fe, u16* snr)
{
struct cx24116_state *state = fe->demodulator_priv;
dprintk("%s()\n", __func__);
*snr = cx24116_readreg(state, CX24116_REG_QUALITY8) << 8 |
cx24116_readreg(state, CX24116_REG_QUALITY0);
dprintk("%s: raw 0x%04x\n", __func__, *snr);
return 0;
}
static int cx24116_read_snr(struct dvb_frontend* fe, u16* snr)
{
if (esno_snr == 1)
return cx24116_read_snr_esno(fe, snr);
else
return cx24116_read_snr_pct(fe, snr);
}
static int cx24116_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
{
struct cx24116_state *state = fe->demodulator_priv;
@ -1383,6 +1413,9 @@ MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");
module_param(toneburst, int, 0644);
MODULE_PARM_DESC(toneburst, "DiSEqC toneburst 0=OFF, 1=TONE CACHE, 2=MESSAGE CACHE (default:1)");
module_param(esno_snr, int, 0644);
MODULE_PARM_DESC(debug, "SNR return units, 0=PERCENTAGE 0-100, 1=ESNO(db * 10) (default:1)");
MODULE_DESCRIPTION("DVB Frontend module for Conexant cx24116/cx24118 hardware");
MODULE_AUTHOR("Steven Toth");
MODULE_LICENSE("GPL");