drivers/media/pci/solo6x10/solo6x10-gpio.c

   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 }