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,comment: "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,comment: "extern write");
102 return 0;
103}
104

source code of linux/drivers/media/pci/bt8xx/bttv-if.c