// 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;
}