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kernel add
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/*
* SDK7786 FPGA USRGPIR Support.
*
* Copyright (C) 2010 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <mach/fpga.h>
#define NR_FPGA_GPIOS 8
static const char *usrgpir_gpio_names[NR_FPGA_GPIOS] = {
"in0", "in1", "in2", "in3", "in4", "in5", "in6", "in7",
};
static int usrgpir_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
/* always in */
return 0;
}
static int usrgpir_gpio_get(struct gpio_chip *chip, unsigned gpio)
{
return !!(fpga_read_reg(USRGPIR) & (1 << gpio));
}
static struct gpio_chip usrgpir_gpio_chip = {
.label = "sdk7786-fpga",
.names = usrgpir_gpio_names,
.direction_input = usrgpir_gpio_direction_input,
.get = usrgpir_gpio_get,
.base = -1, /* don't care */
.ngpio = NR_FPGA_GPIOS,
};
static int __init usrgpir_gpio_setup(void)
{
return gpiochip_add(&usrgpir_gpio_chip);
}
device_initcall(usrgpir_gpio_setup);
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