[media] rtl2832: implement .read_snr()
Based rtl2830 implementation. Cc: Thomas Mair <thomas.mair86@googlemail.com> Signed-off-by: Antti Palosaari <crope@iki.fi> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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@ -19,6 +19,7 @@
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*/
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#include "rtl2832_priv.h"
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#include "dvb_math.h"
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#include <linux/bitops.h>
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int rtl2832_debug;
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@ -355,7 +356,6 @@ err:
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}
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static int rtl2832_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
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{
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int ret;
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@ -379,8 +379,6 @@ err:
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return ret;
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}
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static int rtl2832_init(struct dvb_frontend *fe)
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{
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struct rtl2832_priv *priv = fe->demodulator_priv;
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@ -780,6 +778,52 @@ err:
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return ret;
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}
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static int rtl2832_read_snr(struct dvb_frontend *fe, u16 *snr)
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{
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struct rtl2832_priv *priv = fe->demodulator_priv;
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int ret, hierarchy, constellation;
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u8 buf[2], tmp;
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u16 tmp16;
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#define CONSTELLATION_NUM 3
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#define HIERARCHY_NUM 4
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static const u32 snr_constant[CONSTELLATION_NUM][HIERARCHY_NUM] = {
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{ 85387325, 85387325, 85387325, 85387325 },
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{ 86676178, 86676178, 87167949, 87795660 },
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{ 87659938, 87659938, 87885178, 88241743 },
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};
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/* reports SNR in resolution of 0.1 dB */
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ret = rtl2832_rd_reg(priv, 0x3c, 3, &tmp);
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if (ret)
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goto err;
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constellation = (tmp >> 2) & 0x03; /* [3:2] */
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if (constellation > CONSTELLATION_NUM - 1)
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goto err;
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hierarchy = (tmp >> 4) & 0x07; /* [6:4] */
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if (hierarchy > HIERARCHY_NUM - 1)
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goto err;
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ret = rtl2832_rd_regs(priv, 0x0c, 4, buf, 2);
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if (ret)
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goto err;
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tmp16 = buf[0] << 8 | buf[1];
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if (tmp16)
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*snr = (snr_constant[constellation][hierarchy] -
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intlog10(tmp16)) / ((1 << 24) / 100);
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else
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*snr = 0;
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return 0;
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err:
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dbg("%s: failed=%d", __func__, ret);
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return ret;
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}
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static struct dvb_frontend_ops rtl2832_ops;
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static void rtl2832_release(struct dvb_frontend *fe)
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@ -864,6 +908,8 @@ static struct dvb_frontend_ops rtl2832_ops = {
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.get_frontend = rtl2832_get_frontend,
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.read_status = rtl2832_read_status,
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.read_snr = rtl2832_read_snr,
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.i2c_gate_ctrl = rtl2832_i2c_gate_ctrl,
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};
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