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iio: hid: Add humidity sensor support

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Environmental humidity sensor is a hid defined sensor,
it shows raw humidity measurement of air.

More information can be found in:
http://www.usb.org/developers/hidpage/HUTRR39b.pdf

According to IIO ABI definition, humidityrelative data output unit is
milli percent. Add the unit convert from percent to milli percent.

Signed-off-by: Song Hongyan <hongyan.song@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Song Hongyan
2017-03-20 22:28:45 +08:00
committed by Jonathan Cameron
parent e0ad9b73e8
commit d7ed89d5aa
5 changed files with 338 additions and 0 deletions
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2
drivers/iio/common/hid-sensors/hid-sensor-attributes.c
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@@ -71,6 +71,8 @@ static struct {
{HID_USAGE_SENSOR_TEMPERATURE, 0, 1000, 0},
{HID_USAGE_SENSOR_TEMPERATURE, HID_USAGE_SENSOR_UNITS_DEGREES, 1000, 0},
{HID_USAGE_SENSOR_HUMIDITY, 0, 1000, 0},
};
static int pow_10(unsigned power)