drivers/staging/solo6x10/solo6010-gpio.c

   1 /*
   2  * Copyright (C) 2010 Bluecherry, LLC www.bluecherrydvr.com
   3  * Copyright (C) 2010 Ben Collins <bcollins@bluecherry.net>
   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
  24 #include "solo6010.h"
  25
  26 static void solo_gpio_mode(struct solo6010_dev *solo_dev,
  27                            unsigned int port_mask, unsigned int mode)
  28 {
  29         int port;
  30         unsigned int ret;
  31
  32         ret = solo_reg_read(solo_dev, SOLO_GPIO_CONFIG_0);
  33
  34         /* To set gpio */
  35         for (port = 0; port < 16; port++) {
  36                 if (!((1 << port) & port_mask))
  37                         continue;
  38
  39                 ret &= (~(3 << (port << 1)));
  40                 ret |= ((mode & 3) << (port << 1));
  41         }
  42
  43         solo_reg_write(solo_dev, SOLO_GPIO_CONFIG_0, ret);
  44
  45         /* To set extended gpio - sensor */
  46         ret = solo_reg_read(solo_dev, SOLO_GPIO_CONFIG_1);
  47
  48         for (port = 0; port < 16; port++) {
  49                 if (!((1 << (port + 16)) & port_mask))
  50                         continue;
  51
  52                 if (!mode)
  53                         ret &= ~(1 << port);
  54                 else
  55                         ret |= 1 << port;
  56         }
  57
  58         solo_reg_write(solo_dev, SOLO_GPIO_CONFIG_1, ret);
  59 }
  60
  61 static void solo_gpio_set(struct solo6010_dev *solo_dev, unsigned int value)
  62 {
  63         solo_reg_write(solo_dev, SOLO_GPIO_DATA_OUT,
  64                        solo_reg_read(solo_dev, SOLO_GPIO_DATA_OUT) | value);
  65 }
  66
  67 static void solo_gpio_clear(struct solo6010_dev *solo_dev, unsigned int value)
  68 {
  69         solo_reg_write(solo_dev, SOLO_GPIO_DATA_OUT,
  70                        solo_reg_read(solo_dev, SOLO_GPIO_DATA_OUT) & ~value);
  71 }
  72
  73 static void solo_gpio_config(struct solo6010_dev *solo_dev)
  74 {
  75         /* Video reset */
  76         solo_gpio_mode(solo_dev, 0x30, 1);
  77         solo_gpio_clear(solo_dev, 0x30);
  78         udelay(100);
  79         solo_gpio_set(solo_dev, 0x30);
  80         udelay(100);
  81
  82         /* Warning: Don't touch the next line unless you're sure of what
  83          * you're doing: first four gpio [0-3] are used for video. */
  84         solo_gpio_mode(solo_dev, 0x0f, 2);
  85
  86         /* We use bit 8-15 of SOLO_GPIO_CONFIG_0 for relay purposes */
  87         solo_gpio_mode(solo_dev, 0xff00, 1);
  88
  89         /* Initially set relay status to 0 */
  90         solo_gpio_clear(solo_dev, 0xff00);
  91 }
  92
  93 int solo_gpio_init(struct solo6010_dev *solo_dev)
  94 {
  95         solo_gpio_config(solo_dev);
  96         return 0;
  97 }
  98
  99 void solo_gpio_exit(struct solo6010_dev *solo_dev)
 100 {
 101         solo_gpio_clear(solo_dev, 0x30);
 102         solo_gpio_config(solo_dev);
 103 }