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
cx23885_ir_rx_work_handler(struct work_struct * work)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
cx23885_ir_tx_work_handler(struct work_struct * work)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 */
cx23885_ir_rx_v4l2_dev_notify(struct v4l2_subdev * sd,u32 events)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 */
cx23885_ir_tx_v4l2_dev_notify(struct v4l2_subdev * sd,u32 events)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 }
105