Commit c929ac9e authored by Lucas Stach's avatar Lucas Stach Committed by Dmitry Torokhov
Browse files

Input: exc3000 - fix firmware version query for device in bootloader 



If the device is stuck in bootloader (maybe due to blank or corrupted
application firmware) it won't answer a query for the firmware version.
Fall back to returning the bootloader version in that case.

Signed-off-by: default avatarLucas Stach <l.stach@pengutronix.de>
Link: https://lore.kernel.org/r/20210125182527.1225245-4-l.stach@pengutronix.de


Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 102feb1d

drivers/input/touchscreen/exc3000.c

+14 −0
Original line number Diff line number Diff line
@@ -263,6 +263,20 @@ static ssize_t fw_version_show(struct device *dev, 
	u8 response[EXC3000_LEN_FRAME];

	int ret;



	/* query bootloader info */

	ret = exc3000_vendor_data_request(data,

					  (u8[]){0x39, 0x02}, 2, response, 1);

	if (ret < 0)

		return ret;



	/*

	 * If the bootloader version is non-zero then the device is in

	 * bootloader mode and won't answer a query for the application FW

	 * version, so we just use the bootloader version info.

	 */

	if (response[2] || response[3])

		return sprintf(buf, "%d.%d\n", response[2], response[3]);



	ret = exc3000_vendor_data_request(data, (u8[]){'D'}, 1, response, 1);

	if (ret < 0)

		return ret;