1 /*
2  *  Driver for the Conexant CX23885/7/8 PCIe bridge
3  *
4  *  Infrared device support routines - non-input, non-vl42_subdev routines
5  *
6  *  Copyright (C) 2009  Andy Walls <awalls@md.metrocast.net>
7  *
8  *  This program is free software; you can redistribute it and/or
9  *  modify it under the terms of the GNU General Public License
10  *  as published by the Free Software Foundation; either version 2
11  *  of the License, or (at your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  */
18 
19 #include "cx23885.h"
20 #include "cx23885-ir.h"
21 #include "cx23885-input.h"
22 
23 #include <media/v4l2-device.h>
24 
25 #define CX23885_IR_RX_FIFO_SERVICE_REQ		0
26 #define CX23885_IR_RX_END_OF_RX_DETECTED	1
27 #define CX23885_IR_RX_HW_FIFO_OVERRUN		2
28 #define CX23885_IR_RX_SW_FIFO_OVERRUN		3
29 
30 #define CX23885_IR_TX_FIFO_SERVICE_REQ		0
31 
32 
33 void cx23885_ir_rx_work_handler(struct work_struct *work)
34 {
35 	struct cx23885_dev *dev =
36 			     container_of(work, struct cx23885_dev, ir_rx_work);
37 	u32 events = 0;
38 	unsigned long *notifications = &dev->ir_rx_notifications;
39 
40 	if (test_and_clear_bit(CX23885_IR_RX_SW_FIFO_OVERRUN, notifications))
41 		events |= V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN;
42 	if (test_and_clear_bit(CX23885_IR_RX_HW_FIFO_OVERRUN, notifications))
43 		events |= V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN;
44 	if (test_and_clear_bit(CX23885_IR_RX_END_OF_RX_DETECTED, notifications))
45 		events |= V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED;
46 	if (test_and_clear_bit(CX23885_IR_RX_FIFO_SERVICE_REQ, notifications))
47 		events |= V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ;
48 
49 	if (events == 0)
50 		return;
51 
52 	if (dev->kernel_ir)
53 		cx23885_input_rx_work_handler(dev, events);
54 }
55 
56 void cx23885_ir_tx_work_handler(struct work_struct *work)
57 {
58 	struct cx23885_dev *dev =
59 			     container_of(work, struct cx23885_dev, ir_tx_work);
60 	u32 events = 0;
61 	unsigned long *notifications = &dev->ir_tx_notifications;
62 
63 	if (test_and_clear_bit(CX23885_IR_TX_FIFO_SERVICE_REQ, notifications))
64 		events |= V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ;
65 
66 	if (events == 0)
67 		return;
68 
69 }
70 
71 /* Possibly called in an IRQ context */
72 void cx23885_ir_rx_v4l2_dev_notify(struct v4l2_subdev *sd, u32 events)
73 {
74 	struct cx23885_dev *dev = to_cx23885(sd->v4l2_dev);
75 	unsigned long *notifications = &dev->ir_rx_notifications;
76 
77 	if (events & V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ)
78 		set_bit(CX23885_IR_RX_FIFO_SERVICE_REQ, notifications);
79 	if (events & V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED)
80 		set_bit(CX23885_IR_RX_END_OF_RX_DETECTED, notifications);
81 	if (events & V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN)
82 		set_bit(CX23885_IR_RX_HW_FIFO_OVERRUN, notifications);
83 	if (events & V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN)
84 		set_bit(CX23885_IR_RX_SW_FIFO_OVERRUN, notifications);
85 
86 	/*
87 	 * For the integrated AV core, we are already in a workqueue context.
88 	 * For the CX23888 integrated IR, we are in an interrupt context.
89 	 */
90 	if (sd == dev->sd_cx25840)
91 		cx23885_ir_rx_work_handler(&dev->ir_rx_work);
92 	else
93 		schedule_work(&dev->ir_rx_work);
94 }
95 
96 /* Possibly called in an IRQ context */
97 void cx23885_ir_tx_v4l2_dev_notify(struct v4l2_subdev *sd, u32 events)
98 {
99 	struct cx23885_dev *dev = to_cx23885(sd->v4l2_dev);
100 	unsigned long *notifications = &dev->ir_tx_notifications;
101 
102 	if (events & V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ)
103 		set_bit(CX23885_IR_TX_FIFO_SERVICE_REQ, notifications);
104 
105 	/*
106 	 * For the integrated AV core, we are already in a workqueue context.
107 	 * For the CX23888 integrated IR, we are in an interrupt context.
108 	 */
109 	if (sd == dev->sd_cx25840)
110 		cx23885_ir_tx_work_handler(&dev->ir_tx_work);
111 	else
112 		schedule_work(&dev->ir_tx_work);
113 }
114