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[media] tef6862: clamp frequency 

Clamp the frequency to the valid frequency range as per the V4L2 specification.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Richard Röjfors <richard.rojfors@pelagicore.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2013-05-31 06:19:55 -03:00 committed by Mauro Carvalho Chehab
parent 46821b1d20
commit fa915996fb
1 changed files with 6 additions and 4 deletions
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10
drivers/media/radio/tef6862.c
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@ -30,8 +30,8 @@
#define FREQ_MUL 16000
#define TEF6862_LO_FREQ (875 * FREQ_MUL / 10)
#define TEF6862_HI_FREQ (108 * FREQ_MUL)
#define TEF6862_LO_FREQ (875U * FREQ_MUL / 10)
#define TEF6862_HI_FREQ (108U * FREQ_MUL)
/* Write mode sub addresses */
#define WM_SUB_BANDWIDTH 0x0
@ -104,6 +104,7 @@ static int tef6862_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequen
{
struct tef6862_state *state = to_state(sd);
struct i2c_client *client = v4l2_get_subdevdata(sd);
unsigned freq = f->frequency;
u16 pll;
u8 i2cmsg[3];
int err;
@ -111,7 +112,8 @@ static int tef6862_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequen
if (f->tuner != 0)
return -EINVAL;
pll = 1964 + ((f->frequency - TEF6862_LO_FREQ) * 20) / FREQ_MUL;
clamp(freq, TEF6862_LO_FREQ, TEF6862_HI_FREQ);
pll = 1964 + ((freq - TEF6862_LO_FREQ) * 20) / FREQ_MUL;
i2cmsg[0] = (MODE_PRESET << MODE_SHIFT) | WM_SUB_PLLM;
i2cmsg[1] = (pll >> 8) & 0xff;
i2cmsg[2] = pll & 0xff;
@ -120,7 +122,7 @@ static int tef6862_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequen
if (err != sizeof(i2cmsg))
return err < 0 ? err : -EIO;
state->freq = f->frequency;
state->freq = freq;
return 0;
}