50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/*
|
|
* 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/driver.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_data(&usrgpir_gpio_chip, NULL);
|
|
}
|
|
device_initcall(usrgpir_gpio_setup);
|