[media] rc: interim support for 32-bit NEC-ish scancodes

The Apple and TiVo remotes I've got use an NEC-ish protocol, but rather
than a command/not_command pair, they have what appear to be vendor ID
bytes. This change makes the NEC decoder warn if the command/not_command
checksum fails, but then passes along a full 32-bit scancode for keymap
lookup. This change should make no difference for existing keymaps,
since they simply won't have 32-bit scancodes, but allows for a 32-bit
keymap. At the moment, that'll have to be uploaded by the user, but I've
got Apple and TiVo remote keymaps forthcoming.

In the long run (2.6.40, hopefully), we should probably just always use
all 32 bits for all NEC keymaps, but this should get us by for 2.6.39.

(Note that a few of the TiVo keys actuallly *do* pass the command
checksum, so for now, the keymap for this remote will have to be a mix
of 24-bit and 32-bit scancodes, but so be it).

Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/media/rc/ir-nec-decoder.c b/drivers/media/rc/ir-nec-decoder.c
index 7b58b4a1729b..63ee722dbd02 100644
--- a/drivers/media/rc/ir-nec-decoder.c
+++ b/drivers/media/rc/ir-nec-decoder.c
@@ -49,6 +49,7 @@ static int ir_nec_decode(struct rc_dev *dev, struct ir_raw_event ev)
         struct nec_dec *data = &dev->raw->nec;
         u32 scancode;
         u8 address, not_address, command, not_command;
+        bool send_32bits = false;
 
         if (!(dev->raw->enabled_protocols & RC_TYPE_NEC))
                 return 0;
@@ -164,10 +165,15 @@ static int ir_nec_decode(struct rc_dev *dev, struct ir_raw_event ev)
                 if ((command ^ not_command) != 0xff) {
                         IR_dprintk(1, "NEC checksum error: received 0x%08x\n",
                                    data->bits);
-                        break;
+                        send_32bits = true;
                 }
 
-                if ((address ^ not_address) != 0xff) {
+                if (send_32bits) {
+                        /* NEC transport, but modified protocol, used by at
+                         * least Apple and TiVo remotes */
+                        scancode = data->bits;
+                        IR_dprintk(1, "NEC (modified) scancode 0x%08x\n", scancode);
+                } else if ((address ^ not_address) != 0xff) {
                         /* Extended NEC */
                         scancode = address     << 16 |
                                    not_address <<  8 |