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
36 EXPORT_SYMBOL(bttv_get_pcidev);
37 EXPORT_SYMBOL(bttv_gpio_enable);
38 EXPORT_SYMBOL(bttv_read_gpio);
39 EXPORT_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
bttv_get_pcidev(unsigned int card)46 struct 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
bttv_gpio_enable(unsigned int card,unsigned long mask,unsigned long data)57 int 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
bttv_read_gpio(unsigned int card,unsigned long * data)75 int 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
bttv_write_gpio(unsigned int card,unsigned long mask,unsigned long data)97 int 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
117 /*
118 * Local variables:
119 * c-basic-offset: 8
120 * End:
121 */
122