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 <nick.dyer@xxxxxxxxxxx>
Acked-by: Benson Leung <bleung@xxxxxxxxxxxx>
---
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 99ebdec..767050b 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -1449,6 +1449,28 @@ 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);
@@ -1465,6 +1487,11 @@ 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;
--
1.7.10.4
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