drivers/media/pci/cx23885/cx23885-ir.c

   1 /*
   2  *  Driver for the Conexant CX23885/7/8 PCIe bridge
   3  *
   4  *  Infrared device support routines - non-input, non-vl42_subdev routines
   5  *
   6  *  Copyright (C) 2009  Andy Walls <awalls@md.metrocast.net>
   7  *
   8  *  This program is free software; you can redistribute it and/or
   9  *  modify it under the terms of the GNU General Public License
  10  *  as published by the Free Software Foundation; either version 2
  11  *  of the License, or (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  */
  18
  19 #include "cx23885.h"
  20 #include "cx23885-ir.h"
  21 #include "cx23885-input.h"
  22
  23 #include <media/v4l2-device.h>
  24
  25 #define CX23885_IR_RX_FIFO_SERVICE_REQ          0
  26 #define CX23885_IR_RX_END_OF_RX_DETECTED        1
  27 #define CX23885_IR_RX_HW_FIFO_OVERRUN           2
  28 #define CX23885_IR_RX_SW_FIFO_OVERRUN           3
  29
  30 #define CX23885_IR_TX_FIFO_SERVICE_REQ          0
  31
  32
  33 void cx23885_ir_rx_work_handler(struct work_struct *work)
  34 {
  35         struct cx23885_dev *dev =
  36                              container_of(work, struct cx23885_dev, ir_rx_work);
  37         u32 events = 0;
  38         unsigned long *notifications = &dev->ir_rx_notifications;
  39
  40         if (test_and_clear_bit(CX23885_IR_RX_SW_FIFO_OVERRUN, notifications))
  41                 events |= V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN;
  42         if (test_and_clear_bit(CX23885_IR_RX_HW_FIFO_OVERRUN, notifications))
  43                 events |= V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN;
  44         if (test_and_clear_bit(CX23885_IR_RX_END_OF_RX_DETECTED, notifications))
  45                 events |= V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED;
  46         if (test_and_clear_bit(CX23885_IR_RX_FIFO_SERVICE_REQ, notifications))
  47                 events |= V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ;
  48
  49         if (events == 0)
  50                 return;
  51
  52         if (dev->kernel_ir)
  53                 cx23885_input_rx_work_handler(dev, events);
  54 }
  55
  56 void cx23885_ir_tx_work_handler(struct work_struct *work)
  57 {
  58         struct cx23885_dev *dev =
  59                              container_of(work, struct cx23885_dev, ir_tx_work);
  60         u32 events = 0;
  61         unsigned long *notifications = &dev->ir_tx_notifications;
  62
  63         if (test_and_clear_bit(CX23885_IR_TX_FIFO_SERVICE_REQ, notifications))
  64                 events |= V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ;
  65
  66         if (events == 0)
  67                 return;
  68
  69 }
  70
  71 /* Possibly called in an IRQ context */
  72 void cx23885_ir_rx_v4l2_dev_notify(struct v4l2_subdev *sd, u32 events)
  73 {
  74         struct cx23885_dev *dev = to_cx23885(sd->v4l2_dev);
  75         unsigned long *notifications = &dev->ir_rx_notifications;
  76
  77         if (events & V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ)
  78                 set_bit(CX23885_IR_RX_FIFO_SERVICE_REQ, notifications);
  79         if (events & V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED)
  80                 set_bit(CX23885_IR_RX_END_OF_RX_DETECTED, notifications);
  81         if (events & V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN)
  82                 set_bit(CX23885_IR_RX_HW_FIFO_OVERRUN, notifications);
  83         if (events & V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN)
  84                 set_bit(CX23885_IR_RX_SW_FIFO_OVERRUN, notifications);
  85
  86         /*
  87          * For the integrated AV core, we are already in a workqueue context.
  88          * For the CX23888 integrated IR, we are in an interrupt context.
  89          */
  90         if (sd == dev->sd_cx25840)
  91                 cx23885_ir_rx_work_handler(&dev->ir_rx_work);
  92         else
  93                 schedule_work(&dev->ir_rx_work);
  94 }
  95
  96 /* Possibly called in an IRQ context */
  97 void cx23885_ir_tx_v4l2_dev_notify(struct v4l2_subdev *sd, u32 events)
  98 {
  99         struct cx23885_dev *dev = to_cx23885(sd->v4l2_dev);
 100         unsigned long *notifications = &dev->ir_tx_notifications;
 101
 102         if (events & V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ)
 103                 set_bit(CX23885_IR_TX_FIFO_SERVICE_REQ, notifications);
 104
 105         /*
 106          * For the integrated AV core, we are already in a workqueue context.
 107          * For the CX23888 integrated IR, we are in an interrupt context.
 108          */
 109         if (sd == dev->sd_cx25840)
 110                 cx23885_ir_tx_work_handler(&dev->ir_tx_work);
 111         else
 112                 schedule_work(&dev->ir_tx_work);
 113 }