root/drivers/media/pci/bt8xx/bttv-if.c

DEFINITIONS

1. bttv_get_pcidev
2. bttv_gpio_enable
3. bttv_read_gpio
4. bttv_write_gpio

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3 
   4     bttv-if.c  --  old gpio interface to other kernel modules
   5                    don't use in new code, will go away in 2.7
   6                    have a look at bttv-gpio.c instead.
   7 
   8     bttv - Bt848 frame grabber driver
   9 
  10     Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
  11                            & Marcus Metzler (mocm@thp.uni-koeln.de)
  12     (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
  13 
  14 
  15 */
  16 
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/delay.h>
  20 #include <asm/io.h>
  21 
  22 #include "bttvp.h"
  23 
  24 EXPORT_SYMBOL(bttv_get_pcidev);
  25 EXPORT_SYMBOL(bttv_gpio_enable);
  26 EXPORT_SYMBOL(bttv_read_gpio);
  27 EXPORT_SYMBOL(bttv_write_gpio);
  28 
  29 /* ----------------------------------------------------------------------- */
  30 /* Exported functions - for other modules which want to access the         */
  31 /*                      gpio ports (IR for example)                        */
  32 /*                      see bttv.h for comments                            */
  33 
  34 struct pci_dev* bttv_get_pcidev(unsigned int card)
  35 {
  36         if (card >= bttv_num)
  37                 return NULL;
  38         if (!bttvs[card])
  39                 return NULL;
  40 
  41         return bttvs[card]->c.pci;
  42 }
  43 
  44 
  45 int bttv_gpio_enable(unsigned int card, unsigned long mask, unsigned long data)
  46 {
  47         struct bttv *btv;
  48 
  49         if (card >= bttv_num) {
  50                 return -EINVAL;
  51         }
  52 
  53         btv = bttvs[card];
  54         if (!btv)
  55                 return -ENODEV;
  56 
  57         gpio_inout(mask,data);
  58         if (bttv_gpio)
  59                 bttv_gpio_tracking(btv,"extern enable");
  60         return 0;
  61 }
  62 
  63 int bttv_read_gpio(unsigned int card, unsigned long *data)
  64 {
  65         struct bttv *btv;
  66 
  67         if (card >= bttv_num) {
  68                 return -EINVAL;
  69         }
  70 
  71         btv = bttvs[card];
  72         if (!btv)
  73                 return -ENODEV;
  74 
  75         if(btv->shutdown) {
  76                 return -ENODEV;
  77         }
  78 
  79 /* prior setting BT848_GPIO_REG_INP is (probably) not needed
  80    because we set direct input on init */
  81         *data = gpio_read();
  82         return 0;
  83 }
  84 
  85 int bttv_write_gpio(unsigned int card, unsigned long mask, unsigned long data)
  86 {
  87         struct bttv *btv;
  88 
  89         if (card >= bttv_num) {
  90                 return -EINVAL;
  91         }
  92 
  93         btv = bttvs[card];
  94         if (!btv)
  95                 return -ENODEV;
  96 
  97 /* prior setting BT848_GPIO_REG_INP is (probably) not needed
  98    because direct input is set on init */
  99         gpio_bits(mask,data);
 100         if (bttv_gpio)
 101                 bttv_gpio_tracking(btv,"extern write");
 102         return 0;
 103 }