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  *  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-ir.h"
  28 #include "cx23885-input.h"
  29
  30 #define CX23885_IR_RX_FIFO_SERVICE_REQ          0
  31 #define CX23885_IR_RX_END_OF_RX_DETECTED        1
  32 #define CX23885_IR_RX_HW_FIFO_OVERRUN           2
  33 #define CX23885_IR_RX_SW_FIFO_OVERRUN           3
  34
  35 #define CX23885_IR_TX_FIFO_SERVICE_REQ          0
  36
  37
  38 void cx23885_ir_rx_work_handler(struct work_struct *work)
  39 {
  40         struct cx23885_dev *dev =
  41                              container_of(work, struct cx23885_dev, ir_rx_work);
  42         u32 events = 0;
  43         unsigned long *notifications = &dev->ir_rx_notifications;
  44
  45         if (test_and_clear_bit(CX23885_IR_RX_SW_FIFO_OVERRUN, notifications))
  46                 events |= V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN;
  47         if (test_and_clear_bit(CX23885_IR_RX_HW_FIFO_OVERRUN, notifications))
  48                 events |= V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN;
  49         if (test_and_clear_bit(CX23885_IR_RX_END_OF_RX_DETECTED, notifications))
  50                 events |= V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED;
  51         if (test_and_clear_bit(CX23885_IR_RX_FIFO_SERVICE_REQ, notifications))
  52                 events |= V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ;
  53
  54         if (events == 0)
  55                 return;
  56
  57         if (dev->kernel_ir)
  58                 cx23885_input_rx_work_handler(dev, events);
  59 }
  60
  61 void cx23885_ir_tx_work_handler(struct work_struct *work)
  62 {
  63         struct cx23885_dev *dev =
  64                              container_of(work, struct cx23885_dev, ir_tx_work);
  65         u32 events = 0;
  66         unsigned long *notifications = &dev->ir_tx_notifications;
  67
  68         if (test_and_clear_bit(CX23885_IR_TX_FIFO_SERVICE_REQ, notifications))
  69                 events |= V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ;
  70
  71         if (events == 0)
  72                 return;
  73
  74 }
  75
  76 /* Possibly called in an IRQ context */
  77 void cx23885_ir_rx_v4l2_dev_notify(struct v4l2_subdev *sd, u32 events)
  78 {
  79         struct cx23885_dev *dev = to_cx23885(sd->v4l2_dev);
  80         unsigned long *notifications = &dev->ir_rx_notifications;
  81
  82         if (events & V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ)
  83                 set_bit(CX23885_IR_RX_FIFO_SERVICE_REQ, notifications);
  84         if (events & V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED)
  85                 set_bit(CX23885_IR_RX_END_OF_RX_DETECTED, notifications);
  86         if (events & V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN)
  87                 set_bit(CX23885_IR_RX_HW_FIFO_OVERRUN, notifications);
  88         if (events & V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN)
  89                 set_bit(CX23885_IR_RX_SW_FIFO_OVERRUN, notifications);
  90
  91         /*
  92          * For the integrated AV core, we are already in a workqueue context.
  93          * For the CX23888 integrated IR, we are in an interrupt context.
  94          */
  95         if (sd == dev->sd_cx25840)
  96                 cx23885_ir_rx_work_handler(&dev->ir_rx_work);
  97         else
  98                 schedule_work(&dev->ir_rx_work);
  99 }
 100
 101 /* Possibly called in an IRQ context */
 102 void cx23885_ir_tx_v4l2_dev_notify(struct v4l2_subdev *sd, u32 events)
 103 {
 104         struct cx23885_dev *dev = to_cx23885(sd->v4l2_dev);
 105         unsigned long *notifications = &dev->ir_tx_notifications;
 106
 107         if (events & V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ)
 108                 set_bit(CX23885_IR_TX_FIFO_SERVICE_REQ, notifications);
 109
 110         /*
 111          * For the integrated AV core, we are already in a workqueue context.
 112          * For the CX23888 integrated IR, we are in an interrupt context.
 113          */
 114         if (sd == dev->sd_cx25840)
 115                 cx23885_ir_tx_work_handler(&dev->ir_tx_work);
 116         else
 117                 schedule_work(&dev->ir_tx_work);
 118 }