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}
105