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[media] ati_remote: Check the checksum
authorGeorge Spelvin <linux@horizon.com>
Sun, 11 May 2014 11:12:09 +0000 (08:12 -0300)
committerMauro Carvalho Chehab <m.chehab@samsung.com>
Sat, 26 Jul 2014 02:44:23 +0000 (23:44 -0300)
commit20d7e3ca1be76a13fb4ea22246bb9d0c4c365809
tree55145fffdb69774a882a38e0a4b1086271107716tree | snapshot
parent7cec72ce00c174fd74d1183599d3d3dcc5dedc26commit | diff
[media] ati_remote: Check the checksum

An input report is 4 bytes long, but there are only 12 bits
of actual payload.  The 4 bytes are:
data[0] = 0x14
data[1] = data[2] + data[3] + 0xd5 (a checksum byte)
data[2] = the raw scancode (plus toggle bit in msbit)
data[3] = channel << 4 (the low 4 bits must be zero)

Ignore reports with a bad checksum.

Signed-off-by: George Spelvin <linux@horizon.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
drivers/media/rc/ati_remote.c diff | blob | history
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