Surface Duo devices use a touch digitizer that communicates to the main
SoC via SPI and presents itself as a HID device. This patch's goal is to
add the spi-hid transport driver to drivers/hid. The driver follows the
publically available HID Over SPI Protocol Specification version 1.0.
In the initial commits there are some HID core changes to support a SPI
device, followed by extensions to hid_driver and hid_ll_driver structs
to allow for some error-handling logic delegation from the transport
layer to the device driver, and finally the SPI HID transport driver.
Dmitry Antipov (5):
HID: Add BUS_SPI support when printing out device info in
hid_connect()
HID: define HID_SPI_DEVICE macro in hid.h
HID: add on_transport_error() field to struct hid_driver
HID: add reset() field to struct hid_ll_driver
HID: add spi-hid, transport driver for HID over SPI bus
arch/arm64/configs/defconfig | 1 +
drivers/hid/Kconfig | 2 +
drivers/hid/Makefile | 1 +
drivers/hid/hid-core.c | 3 +
drivers/hid/spi-hid/Kconfig | 25 +
drivers/hid/spi-hid/Makefile | 12 +
drivers/hid/spi-hid/spi-hid-core.c | 1487 +++++++++++++++++++++++++++
drivers/hid/spi-hid/spi-hid-core.h | 201 ++++
drivers/hid/spi-hid/spi-hid_trace.h | 197 ++++
drivers/hid/spi-hid/trace.c | 11 +
include/linux/hid.h | 24 +
11 files changed, 1964 insertions(+)
create mode 100644 drivers/hid/spi-hid/Kconfig
create mode 100644 drivers/hid/spi-hid/Makefile
create mode 100644 drivers/hid/spi-hid/spi-hid-core.c
create mode 100644 drivers/hid/spi-hid/spi-hid-core.h
create mode 100644 drivers/hid/spi-hid/spi-hid_trace.h
create mode 100644 drivers/hid/spi-hid/trace.c
--
2.25.1
