Linux Kernel  3.7.1
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bttv-if.c
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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 ([email protected])
10  & Marcus Metzler ([email protected])
11  (c) 1999-2003 Gerd Knorr <[email protected]>
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 
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 
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 
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 
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  */
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