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authorMichele Jr De Candia <michele.decandia@valueteam.com>2009-11-26 09:22:32 +0100
committerJean Delvare <khali@linux-fr.org>2009-11-26 09:22:32 +0100
commit5f5bfb09d81c9a1d26238ae6668e584c14ae3daf (patch)
treebf709d54c9390eb2682017ce1586b8a9f7467f03 /drivers/i2c
parenta8a8a669ea13d792296737505adc43ccacf3a648 (diff)
i2c/tsl2550: Fix lux value in extended mode
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 <michele.decandia@valueteam.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/chips/tsl2550.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/i2c/chips/tsl2550.c b/drivers/i2c/chips/tsl2550.c
index aa96bd2d27e..a0702f36a72 100644
--- a/drivers/i2c/chips/tsl2550.c
+++ b/drivers/i2c/chips/tsl2550.c
@@ -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);
}