HID: introduce proper zeroing of unused bits in output reports
Some HID devices are looking on the unused bits in the HID reports they
receive. This is violating the specification, but we want to make those
devices work. Well-behaving devices are unaffected, as they don't care
about the unused bits.
If bitsused % 8 is 0 all bits in data[] get used and we don't need to
clear anything. Otherwise (bitsused % 8) bits of the last byte get used.
By shifting 1 for (bitsused % 8) bits and subtracting 1 we create a mask
consisting of (bitsused % 8) ones and remaining zeroes. By ANDing we
clear the upper unused bits.
Signed-off-by: Simon Budig <simon@budig.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 67f3347..c16c949 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -872,8 +872,13 @@
unsigned count = field->report_count;
unsigned offset = field->report_offset;
unsigned size = field->report_size;
+ unsigned bitsused = offset + count * size;
unsigned n;
+ /* make sure the unused bits in the last byte are zeros */
+ if (count > 0 && size > 0 && (bitsused % 8) != 0)
+ data[(bitsused-1)/8] &= (1 << (bitsused % 8)) - 1;
+
for (n = 0; n < count; n++) {
if (field->logical_minimum < 0) /* signed values */
implement(data, offset + n * size, size, s32ton(field->value[n], size));