LXR linux/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
  38void 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
  61void 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 */
  77void 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 */
 102void 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}
 119