bttv-if.c

  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
 24EXPORT_SYMBOL(bttv_get_pcidev);
 25EXPORT_SYMBOL(bttv_gpio_enable);
 26EXPORT_SYMBOL(bttv_read_gpio);
 27EXPORT_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
 34struct 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
 45int 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
 63int 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
 85int 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}