Linux Kernel  3.7.1
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gpio.c
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1 /*
2  * Copyright (C) 2010 Bluecherry, LLC www.bluecherrydvr.com
3  * Copyright (C) 2010 Ben Collins <[email protected]>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18  */
19 
20 #include <linux/kernel.h>
21 #include <linux/fs.h>
22 #include <asm/uaccess.h>
23 #include "solo6x10.h"
24 
25 static void solo_gpio_mode(struct solo_dev *solo_dev,
26  unsigned int port_mask, unsigned int mode)
27 {
28  int port;
29  unsigned int ret;
30 
31  ret = solo_reg_read(solo_dev, SOLO_GPIO_CONFIG_0);
32 
33  /* To set gpio */
34  for (port = 0; port < 16; port++) {
35  if (!((1 << port) & port_mask))
36  continue;
37 
38  ret &= (~(3 << (port << 1)));
39  ret |= ((mode & 3) << (port << 1));
40  }
41 
42  solo_reg_write(solo_dev, SOLO_GPIO_CONFIG_0, ret);
43 
44  /* To set extended gpio - sensor */
45  ret = solo_reg_read(solo_dev, SOLO_GPIO_CONFIG_1);
46 
47  for (port = 0; port < 16; port++) {
48  if (!((1 << (port + 16)) & port_mask))
49  continue;
50 
51  if (!mode)
52  ret &= ~(1 << port);
53  else
54  ret |= 1 << port;
55  }
56 
57  solo_reg_write(solo_dev, SOLO_GPIO_CONFIG_1, ret);
58 }
59 
60 static void solo_gpio_set(struct solo_dev *solo_dev, unsigned int value)
61 {
62  solo_reg_write(solo_dev, SOLO_GPIO_DATA_OUT,
63  solo_reg_read(solo_dev, SOLO_GPIO_DATA_OUT) | value);
64 }
65 
66 static void solo_gpio_clear(struct solo_dev *solo_dev, unsigned int value)
67 {
68  solo_reg_write(solo_dev, SOLO_GPIO_DATA_OUT,
69  solo_reg_read(solo_dev, SOLO_GPIO_DATA_OUT) & ~value);
70 }
71 
72 static void solo_gpio_config(struct solo_dev *solo_dev)
73 {
74  /* Video reset */
75  solo_gpio_mode(solo_dev, 0x30, 1);
76  solo_gpio_clear(solo_dev, 0x30);
77  udelay(100);
78  solo_gpio_set(solo_dev, 0x30);
79  udelay(100);
80 
81  /* Warning: Don't touch the next line unless you're sure of what
82  * you're doing: first four gpio [0-3] are used for video. */
83  solo_gpio_mode(solo_dev, 0x0f, 2);
84 
85  /* We use bit 8-15 of SOLO_GPIO_CONFIG_0 for relay purposes */
86  solo_gpio_mode(solo_dev, 0xff00, 1);
87 
88  /* Initially set relay status to 0 */
89  solo_gpio_clear(solo_dev, 0xff00);
90 }
91 
92 int solo_gpio_init(struct solo_dev *solo_dev)
93 {
94  solo_gpio_config(solo_dev);
95  return 0;
96 }
97 
98 void solo_gpio_exit(struct solo_dev *solo_dev)
99 {
100  solo_gpio_clear(solo_dev, 0x30);
101  solo_gpio_config(solo_dev);
102 }