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/**
* Copyright (C) Linaro 2021. All rights reserved.
*
* Viresh Kumar <viresh.kumar@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#define pr_fmt(fmt) "GPIO Mock: " fmt
#include <linux/debugfs.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/printk.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/gpio/driver.h>
#include <linux/workqueue.h>
#define NGPIO 64
struct gpio_line {
int dir;
int val;
};
struct mock_gpio_chip {
struct gpio_chip gc;
struct gpio_line lines[NGPIO];
};
static struct mock_gpio_chip *mock_gc;
static volatile unsigned int irq_offset;
static struct dentry *rootdir;
static const char *gpio_line_names[NGPIO] = {
"gpio0",
"gpio1",
"gpio2",
"gpio3",
"gpio4",
"gpio5",
"gpio6",
"gpio7",
"gpio8",
"gpio9",
"gpio10",
"gpio11",
"gpio12",
};
static void mock_gpio_irq(struct work_struct *work);
static DECLARE_WORK(work, mock_gpio_irq);
static int mock_gpio_get(struct gpio_chip *gc, unsigned offset)
{
struct mock_gpio_chip *mock_gc = gpiochip_get_data(gc);
pr_info("%s: %d: %u\n", __func__, __LINE__, offset);
return mock_gc->lines[offset].val;
}
static void mock_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
{
struct mock_gpio_chip *mock_gc = gpiochip_get_data(gc);
mock_gc->lines[offset].val = value;
pr_info("%s: %d: %u\n", __func__, __LINE__, offset);
}
static int mock_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
{
struct mock_gpio_chip *mock_gc = gpiochip_get_data(gc);
pr_info("%s: %d: %u\n", __func__, __LINE__, offset);
return mock_gc->lines[offset].dir;
}
static int mock_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
struct mock_gpio_chip *mock_gc = gpiochip_get_data(gc);
pr_info("%s: %d: %u\n", __func__, __LINE__, offset);
mock_gc->lines[offset].dir = 1;
return 0;
}
static int mock_gpio_direction_output(struct gpio_chip *gc,
unsigned offset, int value)
{
struct mock_gpio_chip *mock_gc = gpiochip_get_data(gc);
pr_info("%s: %d: %u\n", __func__, __LINE__, offset);
mock_gc->lines[offset].val = value;
mock_gc->lines[offset].dir = 0;
return 0;
}
static void mock_gpio_irq_enable(struct irq_data *d)
{
pr_info("%s: %d: %lu\n", __func__, __LINE__, d->hwirq);
irq_offset = d->hwirq;
schedule_work(&work);
}
static void mock_gpio_irq_disable(struct irq_data *d)
{
pr_info("%s: %d: %lu\n", __func__, __LINE__, d->hwirq);
}
static void mock_gpio_irq_mask(struct irq_data *d)
{
pr_info("%s: %d: %lu\n", __func__, __LINE__, d->hwirq);
}
static void mock_gpio_irq_unmask(struct irq_data *d)
{
pr_info("%s: %d: %lu\n", __func__, __LINE__, d->hwirq);
}
static int mock_gpio_irq_set_type(struct irq_data *d, unsigned int type)
{
pr_info("%s: %d: %lu\n", __func__, __LINE__, d->hwirq);
return 0;
}
static struct irq_chip irq_chip = {
.name = "mock-gpio",
.irq_enable = mock_gpio_irq_enable,
.irq_disable = mock_gpio_irq_disable,
.irq_mask = mock_gpio_irq_mask,
.irq_unmask = mock_gpio_irq_unmask,
.irq_set_type = mock_gpio_irq_set_type,
};
static void mock_gpio_irq(struct work_struct *work)
{
unsigned int irq = irq_find_mapping(mock_gc->gc.irq.domain, irq_offset);
pr_info("%s: %d: %u\n", __func__, __LINE__, irq_offset);
// local_irq_disable();
handle_nested_irq(irq);
pr_info("%s: %d: %u\n", __func__, __LINE__, irq_offset);
// local_irq_enable();
}
static int mock_gpio_debugfs(void *data, u64 val)
{
if (val >= NGPIO) {
pr_info("Invalid gpio number %s: %d\n", __func__, __LINE__);
return 0;
}
irq_offset = val;
schedule_work(&work);
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(mock_gpio_fops, NULL, mock_gpio_debugfs, "%llu\n");
static int mock_gpio_probe(struct platform_device *pdev)
{
int i, ret;
pr_info("%s: %d\n", __func__, __LINE__);
mock_gc = devm_kzalloc(&pdev->dev, sizeof(*mock_gc), GFP_KERNEL);
if (!mock_gc)
return -ENOMEM;
mock_gc->gc.get_direction = mock_gpio_get_direction;
mock_gc->gc.direction_input = mock_gpio_direction_input;
mock_gc->gc.direction_output = mock_gpio_direction_output;
mock_gc->gc.get = mock_gpio_get;
mock_gc->gc.set = mock_gpio_set;
mock_gc->gc.owner = THIS_MODULE;
mock_gc->gc.parent = &pdev->dev;
mock_gc->gc.ngpio = NGPIO;
mock_gc->gc.base = -1;
mock_gc->gc.label = dev_name(&pdev->dev);
mock_gc->gc.names = gpio_line_names;
mock_gc->gc.owner = THIS_MODULE;
mock_gc->gc.irq.parent_handler = NULL;
mock_gc->gc.irq.num_parents = 0;
mock_gc->gc.irq.parents = NULL;
mock_gc->gc.irq.default_type = IRQ_TYPE_NONE;
mock_gc->gc.irq.handler = handle_edge_irq;
mock_gc->gc.irq.threaded = true;
mock_gc->gc.irq.chip = &irq_chip;
for (i = 0; i < NGPIO; i++)
mock_gc->lines[i].dir = 1;
ret = gpiochip_add_data(&mock_gc->gc, mock_gc);
if (ret) {
dev_err(&pdev->dev, "Failed to add mock-gpio controller\n");
} else {
platform_set_drvdata(pdev, mock_gc);
pr_info("%s: %d\n", __func__, __LINE__);
}
return ret;
}
static int mock_gpio_remove(struct platform_device *pdev)
{
struct mock_gpio_chip *mock_gc = platform_get_drvdata(pdev);
pr_info("%s: %d\n", __func__, __LINE__);
gpiochip_remove(&mock_gc->gc);
return 0;
}
static struct platform_driver mock_gpio_driver = {
.driver = {
.name = "mock_gpio",
},
.probe = mock_gpio_probe,
.remove = mock_gpio_remove,
};
static struct platform_device *gpdev;
static int __init mock_gpio_init(void)
{
int ret = -EINVAL;
gpdev = platform_device_register_data(NULL, "mock_gpio", -1, NULL, 0);
if (!IS_ERR(gpdev)) {
ret = platform_driver_register(&mock_gpio_driver);
if (ret)
platform_device_unregister(gpdev);
}
rootdir = debugfs_create_dir("mockgpio", NULL);
debugfs_create_file("gpio", S_IRUGO | S_IWUSR, rootdir, NULL,
&mock_gpio_fops);
pr_info("%s: %d: %d\n", __func__, __LINE__, ret);
return ret;
}
module_init(mock_gpio_init);
static void __exit mock_gpio_exit(void)
{
pr_info("%s: %d\n", __func__, __LINE__);
platform_driver_unregister(&mock_gpio_driver);
platform_device_unregister(gpdev);
debugfs_remove_recursive(rootdir);
}
module_exit(mock_gpio_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
MODULE_DESCRIPTION("Mock GPIO");
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