linux-imx

// SPDX-License-Identifier: GPL-2.0+

/*

 * GPIO Testing Device Driver

 *

 * Copyright (C) 2014  Kamlakant Patel <kamlakant.patel@broadcom.com>

 * Copyright (C) 2015-2016  Bamvor Jian Zhang <bamv2005@gmail.com>

 * Copyright (C) 2017 Bartosz Golaszewski <brgl@bgdev.pl>

 */

​

#include <linux/init.h>

#include <linux/module.h>

#include <linux/gpio/driver.h>

#include <linux/gpio/consumer.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/irq_sim.h>

#include <linux/debugfs.h>

#include <linux/uaccess.h>

#include <linux/property.h>

​

#include "gpiolib.h"

​

#define GPIO_MOCKUP_NAME    "gpio-mockup"

#define GPIO_MOCKUP_MAX_GC  10

/*

 * We're storing two values per chip: the GPIO base and the number

 * of GPIO lines.

 */

#define GPIO_MOCKUP_MAX_RANGES  (GPIO_MOCKUP_MAX_GC * 2)

/* Maximum of three properties + the sentinel. */

#define GPIO_MOCKUP_MAX_PROP    4

​

#define gpio_mockup_err(...)    pr_err(GPIO_MOCKUP_NAME ": " __VA_ARGS__)

​

enum {

    GPIO_MOCKUP_DIR_IN = 0,

    GPIO_MOCKUP_DIR_OUT = 1,

};

​

/*

 * struct gpio_pin_status - structure describing a GPIO status

 * @dir:       Configures direction of gpio as "in" or "out", 0=in, 1=out

 * @value:     Configures status of the gpio as 0(low) or 1(high)

 */

struct gpio_mockup_line_status {

    int dir;

    int value;

    int pull;

};

​

struct gpio_mockup_chip {

    struct gpio_chip gc;

    struct gpio_mockup_line_status *lines;

    struct irq_sim irqsim;

    struct dentry *dbg_dir;

    struct mutex lock;

};

​

struct gpio_mockup_dbgfs_private {

    struct gpio_mockup_chip *chip;

    struct gpio_desc *desc;

    unsigned int offset;

};

​

static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_RANGES];

static int gpio_mockup_num_ranges;

module_param_array(gpio_mockup_ranges, int, &gpio_mockup_num_ranges, 0400);

​

static bool gpio_mockup_named_lines;

module_param_named(gpio_mockup_named_lines,

           gpio_mockup_named_lines, bool, 0400);

​

static struct dentry *gpio_mockup_dbg_dir;

​

static int gpio_mockup_range_base(unsigned int index)

{

    return gpio_mockup_ranges[index * 2];

}

​

static int gpio_mockup_range_ngpio(unsigned int index)

{

    return gpio_mockup_ranges[index * 2 + 1];

}

​

static int __gpio_mockup_get(struct gpio_mockup_chip *chip,

                 unsigned int offset)

{

    return chip->lines[offset].value;

}

​