LXR linux/drivers/media/pci/bt8xx/bttv-if.c

   1/*
   2
   3    bttv-if.c  --  old gpio interface to other kernel modules
   4                   don't use in new code, will go away in 2.7
   5                   have a look at bttv-gpio.c instead.
   6
   7    bttv - Bt848 frame grabber driver
   8
   9    Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
  10                           & Marcus Metzler (mocm@thp.uni-koeln.de)
  11    (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
  12
  13    This program is free software; you can redistribute it and/or modify
  14    it under the terms of the GNU General Public License as published by
  15    the Free Software Foundation; either version 2 of the License, or
  16    (at your option) any later version.
  17
  18    This program is distributed in the hope that it will be useful,
  19    but WITHOUT ANY WARRANTY; without even the implied warranty of
  20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21    GNU General Public License for more details.
  22
  23    You should have received a copy of the GNU General Public License
  24    along with this program; if not, write to the Free Software
  25    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26
  27*/
  28
  29#include <linux/module.h>
  30#include <linux/init.h>
  31#include <linux/delay.h>
  32#include <asm/io.h>
  33
  34#include "bttvp.h"
  35
  36EXPORT_SYMBOL(bttv_get_pcidev);
  37EXPORT_SYMBOL(bttv_gpio_enable);
  38EXPORT_SYMBOL(bttv_read_gpio);
  39EXPORT_SYMBOL(bttv_write_gpio);
  40
  41/* ----------------------------------------------------------------------- */
  42/* Exported functions - for other modules which want to access the         */
  43/*                      gpio ports (IR for example)                        */
  44/*                      see bttv.h for comments                            */
  45
  46struct pci_dev* bttv_get_pcidev(unsigned int card)
  47{
  48        if (card >= bttv_num)
  49                return NULL;
  50        if (!bttvs[card])
  51                return NULL;
  52
  53        return bttvs[card]->c.pci;
  54}
  55
  56
  57int bttv_gpio_enable(unsigned int card, unsigned long mask, unsigned long data)
  58{
  59        struct bttv *btv;
  60
  61        if (card >= bttv_num) {
  62                return -EINVAL;
  63        }
  64
  65        btv = bttvs[card];
  66        if (!btv)
  67                return -ENODEV;
  68
  69        gpio_inout(mask,data);
  70        if (bttv_gpio)
  71                bttv_gpio_tracking(btv,"extern enable");
  72        return 0;
  73}
  74
  75int bttv_read_gpio(unsigned int card, unsigned long *data)
  76{
  77        struct bttv *btv;
  78
  79        if (card >= bttv_num) {
  80                return -EINVAL;
  81        }
  82
  83        btv = bttvs[card];
  84        if (!btv)
  85                return -ENODEV;
  86
  87        if(btv->shutdown) {
  88                return -ENODEV;
  89        }
  90
  91/* prior setting BT848_GPIO_REG_INP is (probably) not needed
  92   because we set direct input on init */
  93        *data = gpio_read();
  94        return 0;
  95}
  96
  97int bttv_write_gpio(unsigned int card, unsigned long mask, unsigned long data)
  98{
  99        struct bttv *btv;
 100
 101        if (card >= bttv_num) {
 102                return -EINVAL;
 103        }
 104
 105        btv = bttvs[card];
 106        if (!btv)
 107                return -ENODEV;
 108
 109/* prior setting BT848_GPIO_REG_INP is (probably) not needed
 110   because direct input is set on init */
 111        gpio_bits(mask,data);
 112        if (bttv_gpio)
 113                bttv_gpio_tracking(btv,"extern write");
 114        return 0;
 115}
 116