The overall architecture is composed of three modules (or called three processes), which work together in tandem (they serial execution) to complete the touch screen correction function.
Play the role of an entry of the activity to display UI for the end-user to select the target touch screen device, and then click the button to confirm to perform touch screen calibration.
LABEL USER PID PPID VSZ RSS WCHAN ADDR S NAME
u:r:system_app:s0 system 3268 2390 4035444 181772 SyS_epoll_wait 7981f70668 S com.tslib.calibrator
| data I/O | persistence file |
|---|---|
| read | N/A |
| write | /data/system/tscalibrate/active_tsdevice |
Play the role of a caculator to output the calibration parameters of the affine trasformation, it's the known open source of libts/tslib as the touchscreen access library and have serveral touch event filter algorithms of touch screen devices.
LABEL USER PID PPID VSZ RSS WCHAN ADDR S NAME
u:r:tscalibrate:s0 root 3318 1 42464 35484 evdev_read 7335f70190 S ts_calibrate
| data I/O | persistence file |
|---|---|
| read | /data/system/tscalibrate/active_tsdevice |
| write | /data/system/tscalibrate/descriptor_rotation |
Play the role to apply the the touch screen calibration affine transformation, and persist the data of the calibration parameters.
LABEL USER PID PPID VSZ RSS WCHAN ADDR S NAME
u:r:system_server:s0 system 3331 3324 4903020 269728 SyS_epoll_wait 7283a33668 S system_server
| data I/O | persistence file |
|---|---|
| read | /data/system/tscalibrate/active_tsdevice /data/system/tscalibrate/descriptor_rotation |
| write | /data/system/input-manager-state.xml |
The more data stream I/O details are written in metadata/README.md.
Returns the rotation of the screen from its "natural" orientation. The returned value may be Surface#ROTATION_0 (no rotation), Surface#ROTATION_90, Surface#ROTATION_180, or Surface#ROTATION_270. For example, if a device has a naturally tall screen, and the user has turned it on its side to go into a landscape orientation, the value returned here may be either Surface#ROTATION_90 or Surface#ROTATION_270 depending on the direction it was turned. The angle is the rotation of the drawn graphics on the screen, which is the opposite direction of the physical rotation of the device. For example, if the device is rotated 90 degrees counter-clockwise, to compensate rendering will be rotated by 90 degrees clockwise and thus the returned value here will be Surface#ROTATION_90.
| name | value |
|---|---|
| Surface.ROTATION_0 | 0 |
| Surface.ROTATION_90 | 1 |
| Surface.ROTATION_180 | 2 |
| Surface.ROTATION_270 | 3 |
- lib/ts/plugins/*.so dlopen() fail issue.
- init.rc can't make symlink in /system, access /system needs remount first.
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// sepolicy context console:/ # ls -Z // file console:/ # ps -Z // process console:/ # id -Z // current user