/drivers/media/video/bt8xx/bttv-if.c

  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
117/*
118 * Local variables:
119 * c-basic-offset: 8
120 * End:
121 */