[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>

1 files changed, 52 insertions, 2 deletions

diff --git a/drivers/media/dvb-frontends/af9033.c b/drivers/media/dvb-frontends/af9033.c
index b9a0b009aeda..576e9b5f4bbf 100644
--- 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: