Add some documentation about the IPTS driver firmware
Signed-off-by: Dorian Stoll <dorian.stoll@tmsp.io>
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firmware/intel/ipts/README.md
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firmware/intel/ipts/README.md
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# IPTS driver firmware
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This is the driver firmware required for the `intel_ipts` module. It was
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extracted from the `SurfaceBook2_Win10_18362_1904009_0` firmware bundle for
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Windows.
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### Filenames
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* `SurfaceTouchServicingKernel*.bin` -> `vendor_kernel.bin`
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* `SurfaceTouchServicingSFTConfig*.bin` -> `config.bin`
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* `SurfaceTouchServicingDescriptor*.bin` -> `vendor_desc.bin`
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* `iaPreciseTouchDescriptor.bin` -> `intel_desc.bin` (the same for all models)
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* `ipts_fw_config.bin` (custom, the same for all models; https://github.com/ipts-linux-org/ipts-linux-new/commit/63a8944729d989dd98b0fa382fd9693d6a8c097f)
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### HID descriptor
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The HID descriptor for IPTS devices consists of `intel_desc.bin` and
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`vendor_desc.bin` concatinated together by the driver. The result can be
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decompiled by various tools found on the internet:
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```bash
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$ cat intel_desc.bin vendor_desc.bin > hid_desc.bin
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```
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### Quirks
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At the moment, `MSHW0079` is using the HID descriptor from `MSHW0137`. It's own
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HID descriptor is bugged and needs kernel mitigations to have the kernel properly
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register touch input events. See: https://github.com/jakeday/linux-surface/issues/574
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