LXR linux/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
  37void 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
  60void 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 */
  76void 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 */
 101void 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}
 118