diff options
| author |   Antti Palosaari <crope@iki.fi> | 2014-12-14 10:05:49 -0300 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-02-03 16:07:01 -0200 |
| commit | f7caf93fb8ed299c1f9a3d2713c8d588c938316e (patch) | |
| tree | 23b9f648eb32bdec8de1086fb61097000c469254 /drivers/media/dvb-frontends | |
| parent | [media] rtl2832: implement DVBv5 BER statistic (diff) | |
| download | linux-dev-f7caf93fb8ed299c1f9a3d2713c8d588c938316e.tar.xz linux-dev-f7caf93fb8ed299c1f9a3d2713c8d588c938316e.zip | |
[media] rtl2832: wrap DVBv5 CNR to DVBv3 SNR
Change legacy DVBv3 read SNR to return values calculated by DVBv5
statistics.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media/dvb-frontends')
| -rw-r--r-- | drivers/media/dvb-frontends/rtl2832.c | 42 | ||||
| -rw-r--r-- | drivers/media/dvb-frontends/rtl2832_priv.h | 1 |
2 files changed, 5 insertions, 38 deletions
diff --git a/drivers/media/dvb-frontends/rtl2832.c b/drivers/media/dvb-frontends/rtl2832.c index 0a0899d2a6b2..18f150105438 100644 --- a/drivers/media/dvb-frontends/rtl2832.c +++ b/drivers/media/dvb-frontends/rtl2832.c @@ -791,49 +791,15 @@ err: static int rtl2832_read_snr(struct dvb_frontend *fe, u16 *snr) { - struct rtl2832_dev *dev = fe->demodulator_priv; - struct i2c_client *client = dev->client; - int ret, hierarchy, constellation; - u8 buf[2], tmp; - u16 tmp16; -#define CONSTELLATION_NUM 3 -#define HIERARCHY_NUM 4 - static const u32 snr_constant[CONSTELLATION_NUM][HIERARCHY_NUM] = { - { 85387325, 85387325, 85387325, 85387325 }, - { 86676178, 86676178, 87167949, 87795660 }, - { 87659938, 87659938, 87885178, 88241743 }, - }; - - /* reports SNR in resolution of 0.1 dB */ - - ret = rtl2832_rd_reg(dev, 0x3c, 3, &tmp); - if (ret) - goto err; - - constellation = (tmp >> 2) & 0x03; /* [3:2] */ - if (constellation > CONSTELLATION_NUM - 1) - goto err; - - hierarchy = (tmp >> 4) & 0x07; /* [6:4] */ - if (hierarchy > HIERARCHY_NUM - 1) - goto err; - - ret = rtl2832_rd_regs(dev, 0x0c, 4, buf, 2); - if (ret) - goto err; - - tmp16 = buf[0] << 8 | buf[1]; + struct dtv_frontend_properties *c = &fe->dtv_property_cache; - if (tmp16) - *snr = (snr_constant[constellation][hierarchy] - - intlog10(tmp16)) / ((1 << 24) / 100); + /* report SNR in resolution of 0.1 dB */ + if (c->cnr.stat[0].scale == FE_SCALE_DECIBEL) + *snr = div_s64(c->cnr.stat[0].svalue, 100); else *snr = 0; return 0; -err: - dev_dbg(&client->dev, "failed=%d\n", ret); - return ret; } static int rtl2832_read_ber(struct dvb_frontend *fe, u32 *ber) diff --git a/drivers/media/dvb-frontends/rtl2832_priv.h b/drivers/media/dvb-frontends/rtl2832_priv.h index a5f5ccdf10d8..5e90cd49d780 100644 --- a/drivers/media/dvb-frontends/rtl2832_priv.h +++ b/drivers/media/dvb-frontends/rtl2832_priv.h @@ -25,6 +25,7 @@ #include "rtl2832.h" #include <linux/i2c-mux.h> #include <linux/regmap.h> +#include <linux/math64.h> struct rtl2832_dev { struct rtl2832_platform_data *pdata; |