LXR linux/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
  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