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i2c/tsl2550: Fix lux value in extended mode

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According to the TAOS Application Note 'Controlling a Backlight with
the TSL2550 Ambient Light Sensor' (page 14), the actual lux value in
extended mode should be obtained multiplying the calculated lux value
by 5.

Signed-off-by: Michele Jr De Candia <[email protected]>
Signed-off-by: Jean Delvare <[email protected]>
This commit is contained in:
Michele Jr De Candia 2009-11-26 09:22:32 +01:00 • committed by Jean Delvare
commit 5f5bfb09d8
1 changed files with 3 additions and 0 deletions
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3
drivers/i2c/chips/tsl2550.c
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@ -257,6 +257,7 @@ static DEVICE_ATTR(operating_mode, S_IWUSR | S_IRUGO,
static ssize_t __tsl2550_show_lux(struct i2c_client *client, char *buf)
{
struct tsl2550_data *data = i2c_get_clientdata(client);
u8 ch0, ch1;
int ret;
@ -274,6 +275,8 @@ static ssize_t __tsl2550_show_lux(struct i2c_client *client, char *buf)
ret = tsl2550_calculate_lux(ch0, ch1);
if (ret < 0)
return ret;
if (data->operating_mode == 1)
ret *= 5;
return sprintf(buf, "%d\n", ret);
}