cregit-Linux how code gets into the kernel

Release 4.7 arch/sh/boards/mach-sdk7786/gpio.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; }

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paul mundtpaul mundt18100.00%1100.00%
Total18100.00%1100.00%


static int usrgpir_gpio_get(struct gpio_chip *chip, unsigned gpio) { return !!(fpga_read_reg(USRGPIR) & (1 << gpio)); }

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paul mundtpaul mundt30100.00%1100.00%
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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); }

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paul mundtpaul mundt1583.33%150.00%
linus walleijlinus walleij316.67%150.00%
Total18100.00%2100.00%

device_initcall(usrgpir_gpio_setup);

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paul mundtpaul mundt16297.59%150.00%
linus walleijlinus walleij42.41%150.00%
Total166100.00%2100.00%
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