drivers/media/video/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
  36 EXPORT_SYMBOL(bttv_get_pcidev);
  37 EXPORT_SYMBOL(bttv_gpio_enable);
  38 EXPORT_SYMBOL(bttv_read_gpio);
  39 EXPORT_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
  46 struct 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
  57 int 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
  75 int 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
  97 int 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
 117 /*
 118  * Local variables:
 119  * c-basic-offset: 8
 120  * End:
 121  */