From f2ac6cb9201399fa2b2146ea941c0c5ce2aa197a Mon Sep 17 00:00:00 2001 From: Nick Dyer Date: Sun, 18 May 2014 23:15:01 -0700 Subject: Input: atmel_mxt_ts - add check for incorrect firmware file format Atmel supplies firmware files in ASCII HEX format (.enc) which must be converted before they can be loaded by kernel driver. Try to detect the error and print a friendly error message rather than feeding junk to the bootloader. Signed-off-by: Nick Dyer Acked-by: Benson Leung Acked-by: Yufeng Shen Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/atmel_mxt_ts.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'drivers') diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index 9bf32c3b53aa..7a9197a19f67 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -1185,6 +1185,30 @@ done: return error ?: count; } +static int mxt_check_firmware_format(struct device *dev, + const struct firmware *fw) +{ + unsigned int pos = 0; + char c; + + while (pos < fw->size) { + c = *(fw->data + pos); + + if (c < '0' || (c > '9' && c < 'A') || c > 'F') + return 0; + + pos++; + } + + /* + * To convert file try: + * xxd -r -p mXTXXX__APP_VX-X-XX.enc > maxtouch.fw + */ + dev_err(dev, "Aborting: firmware file must be in binary format\n"); + + return -EINVAL; +} + static int mxt_load_fw(struct device *dev, const char *fn) { struct mxt_data *data = dev_get_drvdata(dev); @@ -1201,6 +1225,11 @@ static int mxt_load_fw(struct device *dev, const char *fn) return ret; } + /* Check for incorrect enc file */ + ret = mxt_check_firmware_format(dev, fw); + if (ret) + goto release_firmware; + ret = mxt_lookup_bootloader_address(data); if (ret) goto release_firmware; -- cgit v1.2.3