drivers/media/pci/cx23885/cx23885-ir.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Driver for the Conexant CX23885/7/8 PCIe bridge
   4  *
   5  *  Infrared device support routines - non-input, non-vl42_subdev routines
   6  *
   7  *  Copyright (C) 2009  Andy Walls <awalls@md.metrocast.net>
   8  */
   9
  10 #include "cx23885.h"
  11 #include "cx23885-ir.h"
  12 #include "cx23885-input.h"
  13
  14 #include <media/v4l2-device.h>
  15
  16 #define CX23885_IR_RX_FIFO_SERVICE_REQ          0
  17 #define CX23885_IR_RX_END_OF_RX_DETECTED        1
  18 #define CX23885_IR_RX_HW_FIFO_OVERRUN           2
  19 #define CX23885_IR_RX_SW_FIFO_OVERRUN           3
  20
  21 #define CX23885_IR_TX_FIFO_SERVICE_REQ          0
  22
  23
  24 void cx23885_ir_rx_work_handler(struct work_struct *work)
  25 {
  26         struct cx23885_dev *dev =
  27                              container_of(work, struct cx23885_dev, ir_rx_work);
  28         u32 events = 0;
  29         unsigned long *notifications = &dev->ir_rx_notifications;
  30
  31         if (test_and_clear_bit(CX23885_IR_RX_SW_FIFO_OVERRUN, notifications))
  32                 events |= V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN;
  33         if (test_and_clear_bit(CX23885_IR_RX_HW_FIFO_OVERRUN, notifications))
  34                 events |= V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN;
  35         if (test_and_clear_bit(CX23885_IR_RX_END_OF_RX_DETECTED, notifications))
  36                 events |= V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED;
  37         if (test_and_clear_bit(CX23885_IR_RX_FIFO_SERVICE_REQ, notifications))
  38                 events |= V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ;
  39
  40         if (events == 0)
  41                 return;
  42
  43         if (dev->kernel_ir)
  44                 cx23885_input_rx_work_handler(dev, events);
  45 }
  46
  47 void cx23885_ir_tx_work_handler(struct work_struct *work)
  48 {
  49         struct cx23885_dev *dev =
  50                              container_of(work, struct cx23885_dev, ir_tx_work);
  51         u32 events = 0;
  52         unsigned long *notifications = &dev->ir_tx_notifications;
  53
  54         if (test_and_clear_bit(CX23885_IR_TX_FIFO_SERVICE_REQ, notifications))
  55                 events |= V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ;
  56
  57         if (events == 0)
  58                 return;
  59
  60 }
  61
  62 /* Possibly called in an IRQ context */
  63 void cx23885_ir_rx_v4l2_dev_notify(struct v4l2_subdev *sd, u32 events)
  64 {
  65         struct cx23885_dev *dev = to_cx23885(sd->v4l2_dev);
  66         unsigned long *notifications = &dev->ir_rx_notifications;
  67
  68         if (events & V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ)
  69                 set_bit(CX23885_IR_RX_FIFO_SERVICE_REQ, notifications);
  70         if (events & V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED)
  71                 set_bit(CX23885_IR_RX_END_OF_RX_DETECTED, notifications);
  72         if (events & V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN)
  73                 set_bit(CX23885_IR_RX_HW_FIFO_OVERRUN, notifications);
  74         if (events & V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN)
  75                 set_bit(CX23885_IR_RX_SW_FIFO_OVERRUN, notifications);
  76
  77         /*
  78          * For the integrated AV core, we are already in a workqueue context.
  79          * For the CX23888 integrated IR, we are in an interrupt context.
  80          */
  81         if (sd == dev->sd_cx25840)
  82                 cx23885_ir_rx_work_handler(&dev->ir_rx_work);
  83         else
  84                 schedule_work(&dev->ir_rx_work);
  85 }
  86
  87 /* Possibly called in an IRQ context */
  88 void cx23885_ir_tx_v4l2_dev_notify(struct v4l2_subdev *sd, u32 events)
  89 {
  90         struct cx23885_dev *dev = to_cx23885(sd->v4l2_dev);
  91         unsigned long *notifications = &dev->ir_tx_notifications;
  92
  93         if (events & V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ)
  94                 set_bit(CX23885_IR_TX_FIFO_SERVICE_REQ, notifications);
  95
  96         /*
  97          * For the integrated AV core, we are already in a workqueue context.
  98          * For the CX23888 integrated IR, we are in an interrupt context.
  99          */
 100         if (sd == dev->sd_cx25840)
 101                 cx23885_ir_tx_work_handler(&dev->ir_tx_work);
 102         else
 103                 schedule_work(&dev->ir_tx_work);
 104 }