[media] af9033: implement DVBv5 statistics for signal strength

Let the demod firmware estimate RF signal strength and return it
to the app as a dBm. To handle that, use thread which reads signal
strengths from firmware in 2 sec intervals when device is active.

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

1 files changed, 48 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/af9033.c b/drivers/media/dvb-frontends/af9033.c
index 1bd5a9af7db5..b9a0b009aeda 100644
--- a/drivers/media/dvb-frontends/af9033.c
+++ b/drivers/media/dvb-frontends/af9033.c
@@ -28,13 +28,17 @@ struct af9033_dev {
         struct i2c_client *client;
         struct dvb_frontend fe;
         struct af9033_config cfg;
+        bool is_af9035;
+        bool is_it9135;
 
         u32 bandwidth_hz;
         bool ts_mode_parallel;
         bool ts_mode_serial;
 
+        fe_status_t fe_status;
         u32 ber;
         u32 ucb;
+        struct delayed_work stat_work;
         unsigned long last_stat_check;
 };
 
@@ -442,6 +446,8 @@ static int af9033_init(struct dvb_frontend *fe)
         }
 
         dev->bandwidth_hz = 0; /* force to program all parameters */
+        /* start statistics polling */
+        schedule_delayed_work(&dev->stat_work, msecs_to_jiffies(2000));
 
         return 0;
 
@@ -457,6 +463,9 @@ static int af9033_sleep(struct dvb_frontend *fe)
         int ret, i;
         u8 tmp;
 
+        /* stop statistics polling */
+        cancel_delayed_work_sync(&dev->stat_work);
+
         ret = af9033_wr_reg(dev, 0x80004c, 1);
         if (ret < 0)
                 goto err;
@@ -810,6 +819,8 @@ static int af9033_read_status(struct dvb_frontend *fe, fe_status_t *status)
                                         FE_HAS_LOCK;
         }
 
+        dev->fe_status = *status;
+
         return 0;
 
 err:
@@ -1039,6 +1050,40 @@ err:
         return ret;
 }
 
+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;
+
+        dev_dbg(&dev->client->dev, "\n");
+
+        if (dev->fe_status & FE_HAS_SIGNAL) {
+                if (dev->is_af9035) {
+                        ret = af9033_rd_reg(dev, 0x80004a, &u8tmp);
+                        tmp = -u8tmp * 1000;
+                } else {
+                        ret = af9033_rd_reg(dev, 0x8000f7, &u8tmp);
+                        tmp = (u8tmp - 100) * 1000;
+                }
+                if (ret)
+                        goto err;
+
+                c->strength.len = 1;
+                c->strength.stat[0].scale = FE_SCALE_DECIBEL;
+                c->strength.stat[0].svalue = tmp;
+        } else {
+                c->strength.len = 1;
+                c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+        }
+
+        schedule_delayed_work(&dev->stat_work, msecs_to_jiffies(2000));
+        return;
+err:
+        dev_dbg(&dev->client->dev, "failed=%d\n", ret);
+}
+
 static struct dvb_frontend_ops af9033_ops = {
         .delsys = { SYS_DVBT },
         .info = {
@@ -1099,6 +1144,7 @@ static int af9033_probe(struct i2c_client *client,
 
         /* setup the state */
         dev->client = client;
+        INIT_DELAYED_WORK(&dev->stat_work, af9033_stat_work);
         memcpy(&dev->cfg, cfg, sizeof(struct af9033_config));
 
         if (dev->cfg.clock != 12000000) {
@@ -1117,9 +1163,11 @@ static int af9033_probe(struct i2c_client *client,
         case AF9033_TUNER_IT9135_60:
         case AF9033_TUNER_IT9135_61:
         case AF9033_TUNER_IT9135_62:
+                dev->is_it9135 = true;
                 reg = 0x004bfc;
                 break;
         default:
+                dev->is_af9035 = true;
                 reg = 0x0083e9;
                 break;
         }