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 }
105