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
 24void 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
 47void 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 */
 63void 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 */
 88void 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}