[media] cx22702: Fix signal strength

The signal strength value returned is not quite correct, it decreases
when I increase the gain of my antenna, and vice versa. It also
doesn't span over the whole 0x0000-0xffff range. Compute a value which
at least increases when signal strength increases, and spans the whole
allowed range.

In practice I get 67% with my antenna fully amplified and 51% with
no amplification. This is close enough to what I get on my other
DVB-T adapter with the same antenna.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Steven Toth <stoth@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 19 insertions, 3 deletions

diff --git a/drivers/media/dvb/frontends/cx22702.c b/drivers/media/dvb/frontends/cx22702.c
index faba82485086..edc8eafc5c09 100644
--- a/drivers/media/dvb/frontends/cx22702.c
+++ b/drivers/media/dvb/frontends/cx22702.c
@@ -502,10 +502,26 @@ static int cx22702_read_signal_strength(struct dvb_frontend *fe,
         u16 *signal_strength)
 {
         struct cx22702_state *state = fe->demodulator_priv;
+        u8 reg23;
 
-        u16 rs_ber;
-        rs_ber = cx22702_readreg(state, 0x23);
-        *signal_strength = (rs_ber << 8) | rs_ber;
+        /*
+         * Experience suggests that the strength signal register works as
+         * follows:
+         * - In the absence of signal, value is 0xff.
+         * - In the presence of a weak signal, bit 7 is set, not sure what
+         *   the lower 7 bits mean.
+         * - In the presence of a strong signal, the register holds a 7-bit
+         *   value (bit 7 is cleared), with greater values standing for
+         *   weaker signals.
+         */
+        reg23 = cx22702_readreg(state, 0x23);
+        if (reg23 & 0x80) {
+                *signal_strength = 0;
+        } else {
+                reg23 = ~reg23 & 0x7f;
+                /* Scale to 16 bit */
+                *signal_strength = (reg23 << 9) | (reg23 << 2) | (reg23 >> 5);
+        }
 
         return 0;
 }