V4L/DVB: cx23885: Add preliminary IR Rx support for the HVR-1250 and TeVii S470

Add initial IR Rx support using the intergrated IR controller in the
A/V core of the CX23885 bridge chip.

This initial support is flawed in that I2C transactions should not
be performed in a hard irq context.  That will be fixed in a
follow on patch.

The TeVii S470 support is reported to generate perptual interrupts
that renders a user' system nearly unusable.  The TeVii S470 IR
will be disabled by default in a follow on patch.

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

1 files changed, 44 insertions, 2 deletions

diff --git a/drivers/media/video/cx23885/cx23885-input.c b/drivers/media/video/cx23885/cx23885-input.c
index 496d751ffdc8..3f924e21b957 100644
--- a/drivers/media/video/cx23885/cx23885-input.c
+++ b/drivers/media/video/cx23885/cx23885-input.c
@@ -99,8 +99,10 @@ void cx23885_input_rx_work_handler(struct cx23885_dev *dev, u32 events)
         switch (dev->board) {
         case CX23885_BOARD_HAUPPAUGE_HVR1850:
         case CX23885_BOARD_HAUPPAUGE_HVR1290:
+        case CX23885_BOARD_TEVII_S470:
+        case CX23885_BOARD_HAUPPAUGE_HVR1250:
                 /*
-                 * The only board we handle right now.  However other boards
+                 * The only boards we handle right now.  However other boards
                  * using the CX2388x integrated IR controller should be similar
                  */
                 break;
@@ -148,6 +150,7 @@ static int cx23885_input_ir_start(struct cx23885_dev *dev)
         switch (dev->board) {
         case CX23885_BOARD_HAUPPAUGE_HVR1850:
         case CX23885_BOARD_HAUPPAUGE_HVR1290:
+        case CX23885_BOARD_HAUPPAUGE_HVR1250:
                 /*
                  * The IR controller on this board only returns pulse widths.
                  * Any other mode setting will fail to set up the device.
@@ -172,6 +175,37 @@ static int cx23885_input_ir_start(struct cx23885_dev *dev)
                  */
                 params.invert_level = true;
                 break;
+        case CX23885_BOARD_TEVII_S470:
+                /*
+                 * The IR controller on this board only returns pulse widths.
+                 * Any other mode setting will fail to set up the device.
+                 */
+                params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
+                params.enable = true;
+                params.interrupt_enable = true;
+                params.shutdown = false;
+
+                /* Setup for a standard NEC protocol */
+                params.carrier_freq = 37917; /* Hz, 455 kHz/12 for NEC */
+                params.carrier_range_lower = 33000; /* Hz */
+                params.carrier_range_upper = 43000; /* Hz */
+                params.duty_cycle = 33; /* percent, 33 percent for NEC */
+
+                /*
+                 * NEC max pulse width: (64/3)/(455 kHz/12) * 16 nec_units
+                 * (64/3)/(455 kHz/12) * 16 nec_units * 1.375 = 12378022 ns
+                 */
+                params.max_pulse_width = 12378022; /* ns */
+
+                /*
+                 * NEC noise filter min width: (64/3)/(455 kHz/12) * 1 nec_unit
+                 * (64/3)/(455 kHz/12) * 1 nec_units * 0.625 = 351648 ns
+                 */
+                params.noise_filter_min_width = 351648; /* ns */
+
+                params.modulation = false;
+                params.invert_level = true;
+                break;
         }
         v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
         return 0;
@@ -244,12 +278,20 @@ int cx23885_input_init(struct cx23885_dev *dev)
         switch (dev->board) {
         case CX23885_BOARD_HAUPPAUGE_HVR1850:
         case CX23885_BOARD_HAUPPAUGE_HVR1290:
-                /* Integrated CX23888 IR controller */
+        case CX23885_BOARD_HAUPPAUGE_HVR1250:
+                /* Integrated CX2388[58] IR controller */
                 driver_type = RC_DRIVER_IR_RAW;
                 allowed_protos = IR_TYPE_ALL;
                 /* The grey Hauppauge RC-5 remote */
                 rc_map = RC_MAP_RC5_HAUPPAUGE_NEW;
                 break;
+        case CX23885_BOARD_TEVII_S470:
+                /* Integrated CX23885 IR controller */
+                driver_type = RC_DRIVER_IR_RAW;
+                allowed_protos = IR_TYPE_ALL;
+                /* A guess at the remote */
+                rc_map = RC_MAP_TEVII_NEC;
+                break;
         default:
                 return -ENODEV;
         }