![Gwendal Grignou](/assets/img/avatar_default.png)
Add driver to support older EC firmware that only support deprecated ec command. Rely on ACPI memory map register to access sensor information. Present same interface as the regular cros_ec sensor stack: - one iio device per accelerometer - use HTML5 axis definition - use iio abi units - accept calibration calls, but do nothing Chrome can use the same code than regular cros_ec sensor stack to calculate orientation and lid angle. Signed-off-by: Gwendal Grignou <gwendal@chromium.org> Signed-off-by: Thierry Escande <thierry.escande@collabora.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
29 lines
1.1 KiB
Plaintext
29 lines
1.1 KiB
Plaintext
What: /sys/bus/iio/devices/iio:deviceX/calibrate
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Date: July 2015
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KernelVersion: 4.7
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Contact: linux-iio@vger.kernel.org
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Description:
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Writing '1' will perform a FOC (Fast Online Calibration). The
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corresponding calibration offsets can be read from *_calibbias
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entries.
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What: /sys/bus/iio/devices/iio:deviceX/location
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Date: July 2015
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KernelVersion: 4.7
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Contact: linux-iio@vger.kernel.org
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Description:
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This attribute returns a string with the physical location where
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the motion sensor is placed. For example, in a laptop a motion
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sensor can be located on the base or on the lid. Current valid
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values are 'base' and 'lid'.
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What: /sys/bus/iio/devices/iio:deviceX/id
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Date: Septembre 2017
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KernelVersion: 4.14
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Contact: linux-iio@vger.kernel.org
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Description:
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This attribute is exposed by the CrOS EC legacy accelerometer
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driver and represents the sensor ID as exposed by the EC. This
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ID is used by the Android sensor service hardware abstraction
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layer (sensor HAL) through the Android container on ChromeOS.
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