linux/arch/mips/ar7/gpio.c
Florian Fainelli 7ca5dc145b MIPS: Add support for Texas Instruments AR7 System-on-a-Chip
This patch adds support for the Texas Instruments AR7 System-on-a-Chip.
It supports the TNETD7100, 7200 and 7300 versions of the SoC.

Signed-off-by: Matteo Croce <matteo@openwrt.org>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Eugene Konev <ejka@openwrt.org>
Signed-off-by: Nicolas Thill <nico@openwrt.org>
Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-07-03 15:45:23 +01:00

48 lines
1.3 KiB
C

/*
* Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
* Copyright (C) 2007 Eugene Konev <ejka@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/module.h>
#include <asm/mach-ar7/gpio.h>
static const char *ar7_gpio_list[AR7_GPIO_MAX];
int gpio_request(unsigned gpio, const char *label)
{
if (gpio >= AR7_GPIO_MAX)
return -EINVAL;
if (ar7_gpio_list[gpio])
return -EBUSY;
if (label)
ar7_gpio_list[gpio] = label;
else
ar7_gpio_list[gpio] = "busy";
return 0;
}
EXPORT_SYMBOL(gpio_request);
void gpio_free(unsigned gpio)
{
BUG_ON(!ar7_gpio_list[gpio]);
ar7_gpio_list[gpio] = NULL;
}
EXPORT_SYMBOL(gpio_free);