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