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@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  *  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 #include "cx23885-input.h"
  28
  29 #define CX23885_IR_RX_FIFO_SERVICE_REQ          0
  30 #define CX23885_IR_RX_END_OF_RX_DETECTED        1
  31 #define CX23885_IR_RX_HW_FIFO_OVERRUN           2
  32 #define CX23885_IR_RX_SW_FIFO_OVERRUN           3
  33
  34 #define CX23885_IR_TX_FIFO_SERVICE_REQ          0
  35
  36
  37 void cx23885_ir_rx_work_handler(struct work_struct *work)
  38 {
  39         struct cx23885_dev *dev =
  40                              container_of(work, struct cx23885_dev, ir_rx_work);
  41         u32 events = 0;
  42         unsigned long *notifications = &dev->ir_rx_notifications;
  43
  44         if (test_and_clear_bit(CX23885_IR_RX_SW_FIFO_OVERRUN, notifications))
  45                 events |= V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN;
  46         if (test_and_clear_bit(CX23885_IR_RX_HW_FIFO_OVERRUN, notifications))
  47                 events |= V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN;
  48         if (test_and_clear_bit(CX23885_IR_RX_END_OF_RX_DETECTED, notifications))
  49                 events |= V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED;
  50         if (test_and_clear_bit(CX23885_IR_RX_FIFO_SERVICE_REQ, notifications))
  51                 events |= V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ;
  52
  53         if (events == 0)
  54                 return;
  55
  56         if (dev->kernel_ir)
  57                 cx23885_input_rx_work_handler(dev, events);
  58 }
  59
  60 void cx23885_ir_tx_work_handler(struct work_struct *work)
  61 {
  62         struct cx23885_dev *dev =
  63                              container_of(work, struct cx23885_dev, ir_tx_work);
  64         u32 events = 0;
  65         unsigned long *notifications = &dev->ir_tx_notifications;
  66
  67         if (test_and_clear_bit(CX23885_IR_TX_FIFO_SERVICE_REQ, notifications))
  68                 events |= V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ;
  69
  70         if (events == 0)
  71                 return;
  72
  73 }
  74
  75 /* Possibly called in an IRQ context */
  76 void cx23885_ir_rx_v4l2_dev_notify(struct v4l2_subdev *sd, u32 events)
  77 {
  78         struct cx23885_dev *dev = to_cx23885(sd->v4l2_dev);
  79         unsigned long *notifications = &dev->ir_rx_notifications;
  80
  81         if (events & V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ)
  82                 set_bit(CX23885_IR_RX_FIFO_SERVICE_REQ, notifications);
  83         if (events & V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED)
  84                 set_bit(CX23885_IR_RX_END_OF_RX_DETECTED, notifications);
  85         if (events & V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN)
  86                 set_bit(CX23885_IR_RX_HW_FIFO_OVERRUN, notifications);
  87         if (events & V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN)
  88                 set_bit(CX23885_IR_RX_SW_FIFO_OVERRUN, notifications);
  89
  90         /*
  91          * For the integrated AV core, we are already in a workqueue context.
  92          * For the CX23888 integrated IR, we are in an interrupt context.
  93          */
  94         if (sd == dev->sd_cx25840)
  95                 cx23885_ir_rx_work_handler(&dev->ir_rx_work);
  96         else
  97                 schedule_work(&dev->ir_rx_work);
  98 }
  99
 100 /* Possibly called in an IRQ context */
 101 void cx23885_ir_tx_v4l2_dev_notify(struct v4l2_subdev *sd, u32 events)
 102 {
 103         struct cx23885_dev *dev = to_cx23885(sd->v4l2_dev);
 104         unsigned long *notifications = &dev->ir_tx_notifications;
 105
 106         if (events & V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ)
 107                 set_bit(CX23885_IR_TX_FIFO_SERVICE_REQ, notifications);
 108
 109         /*
 110          * For the integrated AV core, we are already in a workqueue context.
 111          * For the CX23888 integrated IR, we are in an interrupt context.
 112          */
 113         if (sd == dev->sd_cx25840)
 114                 cx23885_ir_tx_work_handler(&dev->ir_tx_work);
 115         else
 116                 schedule_work(&dev->ir_tx_work);
 117 }