On Tue, 14 Apr 2020, Rishi Gupta wrote: > MCP2221 has 4 pins that can be used as GPIO or configured > for alternate functionality such as clock generation and > IRQ detection. This patch adds support for GPIO functionality. > > To set direction of a pin or to toggle its state after it > has been configured as GPIO, driver sends command to mcp2221 > and parses response received from mcp2221. Based on this > response either 0 or appropriate error code is returned to > GPIO framework. > > To get the direction or current state of a pin, driver > sends command and read response from the device. Based on > the response received from device direction or value > is sent to the GPIO framework. > > Command from driver to mcp2221 device are output report. > Response received from mcp2221 is input report. > > Datasheet (page 45-48) contains details about how to decode > the response received from device: > http://ww1.microchip.com/downloads/en/DeviceDoc/20005565B.pdf > > Signed-off-by: Rishi Gupta <gupt21@xxxxxxxxx> > --- > drivers/hid/hid-mcp2221.c | 169 ++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 169 insertions(+) Applied, thanks. -- Jiri Kosina SUSE Labs
