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, addr: notifications))
32 events |= V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN;
33 if (test_and_clear_bit(CX23885_IR_RX_HW_FIFO_OVERRUN, addr: notifications))
34 events |= V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN;
35 if (test_and_clear_bit(CX23885_IR_RX_END_OF_RX_DETECTED, addr: notifications))
36 events |= V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED;
37 if (test_and_clear_bit(CX23885_IR_RX_FIFO_SERVICE_REQ, addr: 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, addr: 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(v4l2_dev: 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, addr: notifications);
70 if (events & V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED)
71 set_bit(CX23885_IR_RX_END_OF_RX_DETECTED, addr: notifications);
72 if (events & V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN)
73 set_bit(CX23885_IR_RX_HW_FIFO_OVERRUN, addr: notifications);
74 if (events & V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN)
75 set_bit(CX23885_IR_RX_SW_FIFO_OVERRUN, addr: 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(work: &dev->ir_rx_work);
83 else
84 schedule_work(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(v4l2_dev: 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, addr: 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(work: &dev->ir_tx_work);
102 else
103 schedule_work(work: &dev->ir_tx_work);
104}
105

source code of linux/drivers/media/pci/cx23885/cx23885-ir.c