drivers/media/video/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@radix.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  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21  *  02110-1301, USA.
  22  */
  23
  24 #include <media/v4l2-device.h>
  25
  26 #include "cx23885.h"
  27
  28 #define CX23885_IR_RX_FIFO_SERVICE_REQ          0
  29 #define CX23885_IR_RX_END_OF_RX_DETECTED        1
  30 #define CX23885_IR_RX_HW_FIFO_OVERRUN           2
  31 #define CX23885_IR_RX_SW_FIFO_OVERRUN           3
  32
  33 #define CX23885_IR_TX_FIFO_SERVICE_REQ          0
  34
  35
  36 void cx23885_ir_rx_work_handler(struct work_struct *work)
  37 {
  38         struct cx23885_dev *dev =
  39                              container_of(work, struct cx23885_dev, ir_rx_work);
  40         u32 events = 0;
  41         unsigned long *notifications = &dev->ir_rx_notifications;
  42
  43         if (test_and_clear_bit(CX23885_IR_RX_SW_FIFO_OVERRUN, notifications))
  44                 events |= V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN;
  45         if (test_and_clear_bit(CX23885_IR_RX_HW_FIFO_OVERRUN, notifications))
  46                 events |= V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN;
  47         if (test_and_clear_bit(CX23885_IR_RX_END_OF_RX_DETECTED, notifications))
  48                 events |= V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED;
  49         if (test_and_clear_bit(CX23885_IR_RX_FIFO_SERVICE_REQ, notifications))
  50                 events |= V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ;
  51
  52         if (events == 0)
  53                 return;
  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 /* 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         schedule_work(&dev->ir_rx_work);
  86 }
  87
  88 /* Called in an IRQ context */
  89 void cx23885_ir_tx_v4l2_dev_notify(struct v4l2_subdev *sd, u32 events)
  90 {
  91         struct cx23885_dev *dev = to_cx23885(sd->v4l2_dev);
  92         unsigned long *notifications = &dev->ir_tx_notifications;
  93
  94         if (events & V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ)
  95                 set_bit(CX23885_IR_TX_FIFO_SERVICE_REQ, notifications);
  96         schedule_work(&dev->ir_tx_work);
  97 }