cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

bttv-if.c (2178B)

      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}