[media] af9033: implement DVBv5 statistics for CNR

Return CNR via DVBv5 statistics API.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/dvb-frontends/af9033.c b/drivers/media/dvb-frontends/af9033.c
index b9a0b00..576e9b5 100644 (file)
--- a/drivers/media/dvb-frontends/af9033.c
+++ b/drivers/media/dvb-frontends/af9033.c
@@ -1054,11 +1054,12 @@ static void af9033_stat_work(struct work_struct *work)
 {
        struct af9033_dev *dev = container_of(work, struct af9033_dev, stat_work.work);
        struct dtv_frontend_properties *c = &dev->fe.dtv_property_cache;
-       int ret, tmp;
-       u8 u8tmp;
+       int ret, tmp, i, len;
+       u8 u8tmp, buf[3];
 
        dev_dbg(&dev->client->dev, "\n");
 
+       /* signal strength */
        if (dev->fe_status & FE_HAS_SIGNAL) {
                if (dev->is_af9035) {
                        ret = af9033_rd_reg(dev, 0x80004a, &u8tmp);
@@ -1078,6 +1079,55 @@ static void af9033_stat_work(struct work_struct *work)
                c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        }
 
+       /* CNR */
+       if (dev->fe_status & FE_HAS_VITERBI) {
+               u32 snr_val;
+               const struct val_snr *snr_lut;
+
+               /* read value */
+               ret = af9033_rd_regs(dev, 0x80002c, buf, 3);
+               if (ret)
+                       goto err;
+
+               snr_val = (buf[2] << 16) | (buf[1] << 8) | (buf[0] << 0);
+
+               /* read current modulation */
+               ret = af9033_rd_reg(dev, 0x80f903, &u8tmp);
+               if (ret)
+                       goto err;
+
+               switch ((u8tmp >> 0) & 3) {
+               case 0:
+                       len = ARRAY_SIZE(qpsk_snr_lut);
+                       snr_lut = qpsk_snr_lut;
+                       break;
+               case 1:
+                       len = ARRAY_SIZE(qam16_snr_lut);
+                       snr_lut = qam16_snr_lut;
+                       break;
+               case 2:
+                       len = ARRAY_SIZE(qam64_snr_lut);
+                       snr_lut = qam64_snr_lut;
+                       break;
+               default:
+                       goto err_schedule_delayed_work;
+               }
+
+               for (i = 0; i < len; i++) {
+                       tmp = snr_lut[i].snr * 1000;
+                       if (snr_val < snr_lut[i].val)
+                               break;
+               }
+
+               c->cnr.len = 1;
+               c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
+               c->cnr.stat[0].svalue = tmp;
+       } else {
+               c->cnr.len = 1;
+               c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       }
+
+err_schedule_delayed_work:
        schedule_delayed_work(&dev->stat_work, msecs_to_jiffies(2000));
        return;
 err: