i2c-hid 解析

https://www.kernel.org/doc/html/v6.2/hid/hid-transport.html

https://www.kernel.org/doc/html/v6.2/hid/hid-transport.html#hid-api

https://www.kernel.org/doc/html/v6.2/hid/hid-transport.html#hid-ll-driver-operations

事件的處理流程：

i2c_hid_core_probe ->
i2c_hid_init_irq ->
request_threaded_irq ->
i2c_hid_irq ->
i2c_hid_get_input ->
hid_input_report

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The current list of HID devices can be found at /sys/bus/hid/devices/.

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HID 描述符：

https://docs.kernel.org/hid/hidintro.html

打印 HID 描述符

hexdump -C /sys/bus/hid/devices/0018:27C6:01E8.0001/report_descriptor

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dev_warn(&client->dev

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sudo libinput list-devices

sudo libinput debug-events