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}
104