V4L/DVB: v4l2_subdev, cx23885: Differentiate IR carrier sense and I/O pin inversion

There is a distinction on IR Tx for the CX2388[578] chips of carrier
sense inversion (space is a carrier burst and mark is no burst) and I/O
pin level inversion (0 is high output level, 1 is low output level).
Allow the caller to set these parameters distinctly as v4l2_subdevice
IR parameters.  This permits the IR device to be configured and enabled
without the IR Tx LED being on during idle/space time due to an external
hardware level inversion

Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 9195ad490ee2..a780cca185fd 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -379,7 +379,10 @@ struct v4l2_subdev_ir_parameters {
         u32 max_pulse_width;       /* ns,      valid only for baseband signal */
         unsigned int carrier_freq; /* Hz,      valid only for modulated signal*/
         unsigned int duty_cycle;   /* percent, valid only for modulated signal*/
-        bool invert;               /* logically invert sense of mark/space */
+        bool invert_level;         /* invert signal level */
+
+        /* Tx only */
+        bool invert_carrier_sense; /* Send 0/space as a carrier burst */
 
         /* Rx only */
         u32 noise_filter_min_width;       /* ns, min time of a valid pulse */