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 
28 static 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 
63 static 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 
69 static 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 
75 static 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 
95 int solo_gpio_init(struct solo_dev *solo_dev)
96 {
97 	solo_gpio_config(solo_dev);
98 	return 0;
99 }
100 
101 void solo_gpio_exit(struct solo_dev *solo_dev)
102 {
103 	solo_gpio_clear(solo_dev, 0x30);
104 	solo_gpio_config(solo_dev);
105 }
106