[media] bttv-input: Add a note about PV951 RC

When comparing lirc-i2c and ir-kbd-i2c/bttv-input logic, a difference
was noticed. As lirc-i2c will be removed soon, store the difference on
a comment inside ir-kbd-i2c, in order to preserve the knowledge we
have about that remote controller.

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

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/media/video/bt8xx/bttv-input.c b/drivers/media/video/bt8xx/bttv-input.c
index 7f48306133be..97793b960600 100644
--- a/drivers/media/video/bt8xx/bttv-input.c
+++ b/drivers/media/video/bt8xx/bttv-input.c
@@ -354,6 +354,18 @@ static int get_key_pv951(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
                 return 0;
         dprintk(KERN_INFO DEVNAME ": key %02x\n", b);
 
+        /*
+         * NOTE:
+         * lirc_i2c maps the pv951 code as:
+         *      addr = 0x61D6
+         *      cmd = bit_reverse (b)
+         * So, it seems that this device uses NEC extended
+         * I decided to not fix the table, due to two reasons:
+         *      1) Without the actual device, this is only a guess;
+         *      2) As the addr is not reported via I2C, nor can be changed,
+         *         the device is bound to the vendor-provided RC.
+         */
+
         *ir_key = b;
         *ir_raw = b;
         return 1;