HID: amd_sfh: Allow configuring whether HPD is enabled or disabled

Human presence detection (HPD) sensor uses a camera to determine when
user is physically in front of the machine. This might not b

HID: amd_sfh: Allow configuring whether HPD is enabled or disabled

Human presence detection (HPD) sensor uses a camera to determine when
user is physically in front of the machine. This might not be a
desirable behavior because it can (for example) cause the machine to
wake on approach.

Add a new sysfs file "hpd" that will control whether this sensor is
enabled. Use the value of this sysfs file to turn off HPD and prevent
it from re-enabling after resume from suspend.

Cc: Pratap Nirujogi <[email protected]>
Tested-by: Anson Tsao <[email protected]>
Signed-off-by: Mario Limonciello <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>

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