Linux 5.6-rc2
[sfrench/cifs-2.6.git] / 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 }