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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 4 bttv-if.c -- old gpio interface to other kernel modules5 don't use in new code, will go away in 2.76 have a look at bttv-gpio.c instead.7 8 bttv - Bt848 frame grabber driver9 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 needed80 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 needed98 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}104