diff options
Diffstat (limited to 'drivers/media/dvb/frontends/mt352.c')
| -rw-r--r-- | drivers/media/dvb/frontends/mt352.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/media/dvb/frontends/mt352.c b/drivers/media/dvb/frontends/mt352.c index d32dc4de9e7f..f0c610f2c2df 100644 --- a/drivers/media/dvb/frontends/mt352.c +++ b/drivers/media/dvb/frontends/mt352.c @@ -35,6 +35,8 @@ #include <linux/moduleparam.h> #include <linux/init.h> #include <linux/delay.h> +#include <linux/string.h> +#include <linux/slab.h> #include "dvb_frontend.h" #include "mt352_priv.h" @@ -462,9 +464,11 @@ static int mt352_read_signal_strength(struct dvb_frontend* fe, u16* strength) { struct mt352_state* state = fe->demodulator_priv; - u16 signal = ((mt352_read_register(state, AGC_GAIN_1) << 8) & 0x0f) | - (mt352_read_register(state, AGC_GAIN_0)); + /* align the 12 bit AGC gain with the most significant bits */ + u16 signal = ((mt352_read_register(state, AGC_GAIN_1) & 0x0f) << 12) | + (mt352_read_register(state, AGC_GAIN_0) << 4); + /* inverse of gain is signal strength */ *strength = ~signal; return 0; } |