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 <media/v4l2-device.h>
20
21#include "cx23885.h"
22#include "cx23885-ir.h"
23#include "cx23885-input.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
33void 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
56void 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 */
72void 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 */
97void 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