[PATCH 20/53] Input: atmel_mxt_ts - Add check for incorrect firmware file format
From: Nick Dyer <hidden>
Date: 2013-06-05 17:51:05
Also in:
lkml
Subsystem:
atmel maxtouch driver, input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Nick Dyer, Dmitry Torokhov, Linus Torvalds
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 <redacted> Acked-by: Benson Leung <bleung@chromium.org> --- drivers/input/touchscreen/atmel_mxt_ts.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+)
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index e8f410c..7daa413 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c@@ -1458,6 +1458,28 @@ 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 -1; +} + static int mxt_load_fw(struct device *dev, const char *fn) { struct mxt_data *data = dev_get_drvdata(dev);
@@ -1474,6 +1496,11 @@ 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;
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1.7.10.4