1/*
2
3    bttv-if.c  --  old gpio interface to other kernel modules
4		   don't use in new code, will go away in 2.7
5		   have a look at bttv-gpio.c instead.
6
7    bttv - Bt848 frame grabber driver
8
9    Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
10			   & Marcus Metzler (mocm@thp.uni-koeln.de)
11    (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
12
13    This program is free software; you can redistribute it and/or modify
14    it under the terms of the GNU General Public License as published by
15    the Free Software Foundation; either version 2 of the License, or
16    (at your option) any later version.
17
18    This program is distributed in the hope that it will be useful,
19    but WITHOUT ANY WARRANTY; without even the implied warranty of
20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21    GNU General Public License for more details.
22
23    You should have received a copy of the GNU General Public License
24    along with this program; if not, write to the Free Software
25    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26
27*/
28
29#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/delay.h>
32#include <asm/io.h>
33
34#include "bttvp.h"
35
36EXPORT_SYMBOL(bttv_get_pcidev);
37EXPORT_SYMBOL(bttv_gpio_enable);
38EXPORT_SYMBOL(bttv_read_gpio);
39EXPORT_SYMBOL(bttv_write_gpio);
40
41/* ----------------------------------------------------------------------- */
42/* Exported functions - for other modules which want to access the         */
43/*                      gpio ports (IR for example)                        */
44/*                      see bttv.h for comments                            */
45
46struct pci_dev* bttv_get_pcidev(unsigned int card)
47{
48	if (card >= bttv_num)
49		return NULL;
50	if (!bttvs[card])
51		return NULL;
52
53	return bttvs[card]->c.pci;
54}
55
56
57int bttv_gpio_enable(unsigned int card, unsigned long mask, unsigned long data)
58{
59	struct bttv *btv;
60
61	if (card >= bttv_num) {
62		return -EINVAL;
63	}
64
65	btv = bttvs[card];
66	if (!btv)
67		return -ENODEV;
68
69	gpio_inout(mask,data);
70	if (bttv_gpio)
71		bttv_gpio_tracking(btv,"extern enable");
72	return 0;
73}
74
75int bttv_read_gpio(unsigned int card, unsigned long *data)
76{
77	struct bttv *btv;
78
79	if (card >= bttv_num) {
80		return -EINVAL;
81	}
82
83	btv = bttvs[card];
84	if (!btv)
85		return -ENODEV;
86
87	if(btv->shutdown) {
88		return -ENODEV;
89	}
90
91/* prior setting BT848_GPIO_REG_INP is (probably) not needed
92   because we set direct input on init */
93	*data = gpio_read();
94	return 0;
95}
96
97int bttv_write_gpio(unsigned int card, unsigned long mask, unsigned long data)
98{
99	struct bttv *btv;
100
101	if (card >= bttv_num) {
102		return -EINVAL;
103	}
104
105	btv = bttvs[card];
106	if (!btv)
107		return -ENODEV;
108
109/* prior setting BT848_GPIO_REG_INP is (probably) not needed
110   because direct input is set on init */
111	gpio_bits(mask,data);
112	if (bttv_gpio)
113		bttv_gpio_tracking(btv,"extern write");
114	return 0;
115}
116