linux/drivers/media/video/bt8xx/bttv-if.c
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   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        return bttvs[card].c.pci;
  51}
  52
  53
  54int bttv_gpio_enable(unsigned int card, unsigned long mask, unsigned long data)
  55{
  56        struct bttv *btv;
  57
  58        if (card >= bttv_num) {
  59                return -EINVAL;
  60        }
  61
  62        btv = &bttvs[card];
  63        gpio_inout(mask,data);
  64        if (bttv_gpio)
  65                bttv_gpio_tracking(btv,"extern enable");
  66        return 0;
  67}
  68
  69int bttv_read_gpio(unsigned int card, unsigned long *data)
  70{
  71        struct bttv *btv;
  72
  73        if (card >= bttv_num) {
  74                return -EINVAL;
  75        }
  76
  77        btv = &bttvs[card];
  78
  79        if(btv->shutdown) {
  80                return -ENODEV;
  81        }
  82
  83/* prior setting BT848_GPIO_REG_INP is (probably) not needed
  84   because we set direct input on init */
  85        *data = gpio_read();
  86        return 0;
  87}
  88
  89int bttv_write_gpio(unsigned int card, unsigned long mask, unsigned long data)
  90{
  91        struct bttv *btv;
  92
  93        if (card >= bttv_num) {
  94                return -EINVAL;
  95        }
  96
  97        btv = &bttvs[card];
  98
  99/* prior setting BT848_GPIO_REG_INP is (probably) not needed
 100   because direct input is set on init */
 101        gpio_bits(mask,data);
 102        if (bttv_gpio)
 103                bttv_gpio_tracking(btv,"extern write");
 104        return 0;
 105}
 106
 107/*
 108 * Local variables:
 109 * c-basic-offset: 8
 110 * End:
 111 */
 112
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