1/*
2 * Copyright (C) 2010-2013 Bluecherry, LLC <http://www.bluecherrydvr.com>
3 *
4 * Original author:
5 * Ben Collins <bcollins@ubuntu.com>
6 *
7 * Additional work by:
8 * John Brooks <john.brooks@bluecherry.net>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18 * GNU General Public License for more details.
19 */
20
21#include <linux/kernel.h>
22#include <linux/fs.h>
23#include <linux/delay.h>
24#include <linux/uaccess.h>
25
26#include "solo6x10.h"
27
28static void solo_gpio_mode(struct solo_dev *solo_dev,
29			   unsigned int port_mask, unsigned int mode)
30{
31	int port;
32	unsigned int ret;
33
34	ret = solo_reg_read(solo_dev, SOLO_GPIO_CONFIG_0);
35
36	/* To set gpio */
37	for (port = 0; port < 16; port++) {
38		if (!((1 << port) & port_mask))
39			continue;
40
41		ret &= (~(3 << (port << 1)));
42		ret |= ((mode & 3) << (port << 1));
43	}
44
45	solo_reg_write(solo_dev, SOLO_GPIO_CONFIG_0, ret);
46
47	/* To set extended gpio - sensor */
48	ret = solo_reg_read(solo_dev, SOLO_GPIO_CONFIG_1);
49
50	for (port = 0; port < 16; port++) {
51		if (!((1 << (port + 16)) & port_mask))
52			continue;
53
54		if (!mode)
55			ret &= ~(1 << port);
56		else
57			ret |= 1 << port;
58	}
59
60	solo_reg_write(solo_dev, SOLO_GPIO_CONFIG_1, ret);
61}
62
63static void solo_gpio_set(struct solo_dev *solo_dev, unsigned int value)
64{
65	solo_reg_write(solo_dev, SOLO_GPIO_DATA_OUT,
66		       solo_reg_read(solo_dev, SOLO_GPIO_DATA_OUT) | value);
67}
68
69static void solo_gpio_clear(struct solo_dev *solo_dev, unsigned int value)
70{
71	solo_reg_write(solo_dev, SOLO_GPIO_DATA_OUT,
72		       solo_reg_read(solo_dev, SOLO_GPIO_DATA_OUT) & ~value);
73}
74
75static void solo_gpio_config(struct solo_dev *solo_dev)
76{
77	/* Video reset */
78	solo_gpio_mode(solo_dev, 0x30, 1);
79	solo_gpio_clear(solo_dev, 0x30);
80	udelay(100);
81	solo_gpio_set(solo_dev, 0x30);
82	udelay(100);
83
84	/* Warning: Don't touch the next line unless you're sure of what
85	 * you're doing: first four gpio [0-3] are used for video. */
86	solo_gpio_mode(solo_dev, 0x0f, 2);
87
88	/* We use bit 8-15 of SOLO_GPIO_CONFIG_0 for relay purposes */
89	solo_gpio_mode(solo_dev, 0xff00, 1);
90
91	/* Initially set relay status to 0 */
92	solo_gpio_clear(solo_dev, 0xff00);
93}
94
95int solo_gpio_init(struct solo_dev *solo_dev)
96{
97	solo_gpio_config(solo_dev);
98	return 0;
99}
100
101void solo_gpio_exit(struct solo_dev *solo_dev)
102{
103	solo_gpio_clear(solo_dev, 0x30);
104	solo_gpio_config(solo_dev);
105}
106