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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/drivers/media/video/bt8xx/bttv-if.c
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/*

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    bttv-if.c  --  old gpio interface to other kernel modules

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		   don't use in new code, will go away in 2.7

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		   have a look at bttv-gpio.c instead.

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    bttv - Bt848 frame grabber driver

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    Copyright (C) 1996,97,98 Ralph  Metzler ([email protected])

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			   & Marcus Metzler ([email protected])

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    (c) 1999-2003 Gerd Knorr <[email protected]>

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    This program is free software; you can redistribute it and/or modify

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    it under the terms of the GNU General Public License as published by

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    the Free Software Foundation; either version 2 of the License, or

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    (at your option) any later version.

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    This program is distributed in the hope that it will be useful,

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    but WITHOUT ANY WARRANTY; without even the implied warranty of

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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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    GNU General Public License for more details.

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    You should have received a copy of the GNU General Public License

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    along with this program; if not, write to the Free Software

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    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

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*/

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#include <linux/module.h>

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#include <linux/init.h>

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#include <linux/delay.h>

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#include <asm/io.h>

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#include "bttvp.h"

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EXPORT_SYMBOL(bttv_get_pcidev);

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EXPORT_SYMBOL(bttv_gpio_enable);

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EXPORT_SYMBOL(bttv_read_gpio);

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EXPORT_SYMBOL(bttv_write_gpio);

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/* ----------------------------------------------------------------------- */

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/* Exported functions - for other modules which want to access the         */

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/*                      gpio ports (IR for example)                        */

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/*                      see bttv.h for comments                            */

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struct pci_dev* bttv_get_pcidev(unsigned int card)

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{

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	if (card >= bttv_num)

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		return NULL;

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	if (!bttvs[card])

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		return NULL;

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	return bttvs[card]->c.pci;

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}

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int bttv_gpio_enable(unsigned int card, unsigned long mask, unsigned long data)

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{

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	struct bttv *btv;

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	if (card >= bttv_num) {

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		return -EINVAL;

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	}

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	btv = bttvs[card];

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	if (!btv)

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		return -ENODEV;

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	gpio_inout(mask,data);

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	if (bttv_gpio)

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		bttv_gpio_tracking(btv,"extern enable");

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	return 0;

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}

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int bttv_read_gpio(unsigned int card, unsigned long *data)

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{

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	struct bttv *btv;

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	if (card >= bttv_num) {

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		return -EINVAL;

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	}

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	btv = bttvs[card];

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	if (!btv)

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		return -ENODEV;

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	if(btv->shutdown) {

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		return -ENODEV;

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	}

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/* prior setting BT848_GPIO_REG_INP is (probably) not needed

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   because we set direct input on init */

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	*data = gpio_read();

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	return 0;

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}

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int bttv_write_gpio(unsigned int card, unsigned long mask, unsigned long data)

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{

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	struct bttv *btv;

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	if (card >= bttv_num) {

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		return -EINVAL;

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	}

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	btv = bttvs[card];

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	if (!btv)

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		return -ENODEV;

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/* prior setting BT848_GPIO_REG_INP is (probably) not needed

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   because direct input is set on init */

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	gpio_bits(mask,data);

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	if (bttv_gpio)

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		bttv_gpio_tracking(btv,"extern write");

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	return 0;

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}

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/*

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 * Local variables:

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 * c-basic-offset: 8

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 * End:

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 */

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