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// SPDX-License-Identifier: GPL-2.0-or-later
/*
bttv-if.c -- old gpio interface to other kernel modules
don't use in new code, will go away in 2.7
have a look at bttv-gpio.c instead.
bttv - Bt848 frame grabber driver
Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de)
& Marcus Metzler (mocm@thp.uni-koeln.de)
(c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/io.h>
#include "bttvp.h"
EXPORT_SYMBOL(bttv_get_pcidev);
EXPORT_SYMBOL(bttv_gpio_enable);
EXPORT_SYMBOL(bttv_read_gpio);
EXPORT_SYMBOL(bttv_write_gpio);
/* ----------------------------------------------------------------------- */
/* Exported functions - for other modules which want to access the */
/* gpio ports (IR for example) */
/* see bttv.h for comments */
struct pci_dev* bttv_get_pcidev(unsigned int card)
{
if (card >= bttv_num)
return NULL;
if (!bttvs[card])
return NULL;
return bttvs[card]->c.pci;
}
int bttv_gpio_enable(unsigned int card, unsigned long mask, unsigned long data)
{
struct bttv *btv;
if (card >= bttv_num) {
return -EINVAL;
}
btv = bttvs[card];
if (!btv)
return -ENODEV;
gpio_inout(mask,data);
if (bttv_gpio)
bttv_gpio_tracking(btv,"extern enable");
return 0;
}
int bttv_read_gpio(unsigned int card, unsigned long *data)
{
struct bttv *btv;
if (card >= bttv_num) {
return -EINVAL;
}
btv = bttvs[card];
if (!btv)
return -ENODEV;
if(btv->shutdown) {
return -ENODEV;
}
/* prior setting BT848_GPIO_REG_INP is (probably) not needed
because we set direct input on init */
*data = gpio_read();
return 0;
}
int bttv_write_gpio(unsigned int card, unsigned long mask, unsigned long data)
{
struct bttv *btv;
if (card >= bttv_num) {
return -EINVAL;
}
btv = bttvs[card];
if (!btv)
return -ENODEV;
/* prior setting BT848_GPIO_REG_INP is (probably) not needed
because direct input is set on init */
gpio_bits(mask,data);
if (bttv_gpio)
bttv_gpio_tracking(btv,"extern write");
return 0;
}
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