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>

diff --git a/drivers/i2c/chips/tsl2550.c b/drivers/i2c/chips/tsl2550.c
index aa96bd2..a0702f3 100644 (file)
--- 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);
 }