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Add SePolicy for system_server accessing sysfs for USB devices

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Add SePolicy to allow Android input manager accessing sysfs nodes
for external USB devices

To support input device lights manager feature in frameworks, provide
sysfs node access to system server process.
DD: go/pk_backlight_control (For keyboard backlight control for external
keyboards)

Similar changes: ag/20092266

Kernel provides a standardized LED interface to expose LED controls
over sysfs: https://docs.kernel.org/leds/leds-class.html
The feature will be provided for devices with kernel sysfs class led
support and vendor kernel driver for input controllers that do have
lights. The kernel sysfs class led support is a kernel config option
(LEDS_CLASS), and an input device driver will create the sysfs class
node interface.
By giving system_server the access to these sysfs nodes, the feature
will work on devices with the kernel option and kernel input/hid driver
support. We do use CTS tests to enforce the kernel options and the
input device drivers.

What's already supported?
- We already support access to UHID sysfs node which used for all
bluetooth based external peripherals

What's included in this CL?
- Adding support to access sysfs nodes for USB based external devices

Test: manual
Bug: 245506418
Change-Id: I51c642ffe7293f793b7b6a131e8d2a37aea4a547
This commit is contained in:
Vaibhav Devmurari 2022-11-21 17:39:22 +00:00
parent 2f94cdf9f1
commit 2295e34d68
1 changed files with 4 additions and 0 deletions
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4
whitechapel_pro/genfs_contexts
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@ -127,6 +127,10 @@ genfscon sysfs /devices/platform/17000080.devfreq_bo/devfreq/17000080.devfreq_bo
# OTA
genfscon sysfs /devices/platform/14700000.ufs/pixel/boot_lun_enabled u:object_r:sysfs_ota:s0
# Input
genfscon sysfs /devices/platform/11210000.usb/11210000.dwc3/xhci-hcd-exynos.4.auto/usb2/2-1 u:object_r:sysfs_uhid:s0
genfscon sysfs /devices/platform/11210000.usb/11210000.dwc3/xhci-hcd-exynos.5.auto/usb2/2-1 u:object_r:sysfs_uhid:s0
# Display
genfscon sysfs /devices/platform/1c2c0000.drmdsim/1c2c0000.drmdsim.0/gamma u:object_r:sysfs_display:s0
genfscon sysfs /devices/platform/1c2c0000.drmdsim/1c2c0000.drmdsim.0/min_vrefresh u:object_r:sysfs_display:s0