[mirror_ubuntu-artful-kernel.git] / drivers / gpio / gpio-mockup.c

/*
 * GPIO Testing Device Driver
 *
 * Copyright (C) 2014  Kamlakant Patel <kamlakant.patel@broadcom.com>
 * Copyright (C) 2015-2016  Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
 * Copyright (C) 2017 Bartosz Golaszewski <brgl@bgdev.pl>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */

#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_work.h>
#include <linux/debugfs.h>
#include <linux/uaccess.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)

enum {
	GPIO_MOCKUP_DIR_OUT = 0,
	GPIO_MOCKUP_DIR_IN = 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;
	bool value;
	bool irq_enabled;
};

struct gpio_mockup_irq_context {
	struct irq_work work;
	int irq;
};

struct gpio_mockup_chip {
	struct gpio_chip gc;
	struct gpio_mockup_line_status *lines;
	struct gpio_mockup_irq_context irq_ctx;
	struct dentry *dbg_dir;
};

struct gpio_mockup_dbgfs_private {
	struct gpio_mockup_chip *chip;
	struct gpio_desc *desc;
	int offset;
};

static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_RANGES];
static int gpio_mockup_params_nr;
module_param_array(gpio_mockup_ranges, int, &gpio_mockup_params_nr, 0400);

static bool gpio_mockup_named_lines;
module_param_named(gpio_mockup_named_lines,
		   gpio_mockup_named_lines, bool, 0400);

static const char gpio_mockup_name_start = 'A';
static struct dentry *gpio_mockup_dbg_dir;

static int gpio_mockup_get(struct gpio_chip *gc, unsigned int offset)
{
	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);

	return chip->lines[offset].value;
}

static void gpio_mockup_set(struct gpio_chip *gc, unsigned int offset,
			    int value)
{
	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);

	chip->lines[offset].value = !!value;
}

static int gpio_mockup_dirout(struct gpio_chip *gc, unsigned int offset,
			      int value)
{
	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);

	gpio_mockup_set(gc, offset, value);
	chip->lines[offset].dir = GPIO_MOCKUP_DIR_OUT;

	return 0;
}

static int gpio_mockup_dirin(struct gpio_chip *gc, unsigned int offset)
{
	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);

	chip->lines[offset].dir = GPIO_MOCKUP_DIR_IN;

	return 0;
}

static int gpio_mockup_get_direction(struct gpio_chip *gc, unsigned int offset)
{
	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);

	return chip->lines[offset].dir;
}

static int gpio_mockup_name_lines(struct device *dev,
				  struct gpio_mockup_chip *chip)
{
	struct gpio_chip *gc = &chip->gc;
	char **names;
	int i;

	names = devm_kcalloc(dev, gc->ngpio, sizeof(char *), GFP_KERNEL);
	if (!names)
		return -ENOMEM;

	for (i = 0; i < gc->ngpio; i++) {
		names[i] = devm_kasprintf(dev, GFP_KERNEL,
					  "%s-%d", gc->label, i);
		if (!names[i])
			return -ENOMEM;
	}

	gc->names = (const char *const *)names;

	return 0;
}

static int gpio_mockup_to_irq(struct gpio_chip *chip, unsigned int offset)
{
	return chip->irq_base + offset;
}

static void gpio_mockup_irqmask(struct irq_data *data)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);

	chip->lines[data->irq - gc->irq_base].irq_enabled = false;
}

static void gpio_mockup_irqunmask(struct irq_data *data)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);

	chip->lines[data->irq - gc->irq_base].irq_enabled = true;
}

static struct irq_chip gpio_mockup_irqchip = {
	.name		= GPIO_MOCKUP_NAME,
	.irq_mask	= gpio_mockup_irqmask,
	.irq_unmask	= gpio_mockup_irqunmask,
};

static void gpio_mockup_handle_irq(struct irq_work *work)
{
	struct gpio_mockup_irq_context *irq_ctx;

	irq_ctx = container_of(work, struct gpio_mockup_irq_context, work);
	handle_simple_irq(irq_to_desc(irq_ctx->irq));
}

static int gpio_mockup_irqchip_setup(struct device *dev,
				     struct gpio_mockup_chip *chip)
{
	struct gpio_chip *gc = &chip->gc;
	int irq_base, i;

	irq_base = devm_irq_alloc_descs(dev, -1, 0, gc->ngpio, 0);
	if (irq_base < 0)
		return irq_base;

	gc->irq_base = irq_base;
	gc->irqchip = &gpio_mockup_irqchip;

	for (i = 0; i < gc->ngpio; i++) {
		irq_set_chip(irq_base + i, gc->irqchip);
		irq_set_chip_data(irq_base + i, gc);
		irq_set_handler(irq_base + i, &handle_simple_irq);
		irq_modify_status(irq_base + i,
				  IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE);
	}

	init_irq_work(&chip->irq_ctx.work, gpio_mockup_handle_irq);

	return 0;
}

static ssize_t gpio_mockup_event_write(struct file *file,
				       const char __user *usr_buf,
				       size_t size, loff_t *ppos)
{
	struct gpio_mockup_dbgfs_private *priv;
	struct gpio_mockup_chip *chip;
	struct seq_file *sfile;
	struct gpio_desc *desc;
	struct gpio_chip *gc;
	int rv, val;

	rv = kstrtoint_from_user(usr_buf, size, 0, &val);
	if (rv)
		return rv;
	if (val != 0 && val != 1)
		return -EINVAL;

	sfile = file->private_data;
	priv = sfile->private;
	desc = priv->desc;
	chip = priv->chip;
	gc = &chip->gc;

	if (chip->lines[priv->offset].irq_enabled) {
		gpiod_set_value_cansleep(desc, val);
		priv->chip->irq_ctx.irq = gc->irq_base + priv->offset;
		irq_work_queue(&priv->chip->irq_ctx.work);
	}

	return size;
}

static int gpio_mockup_event_open(struct inode *inode, struct file *file)
{
	return single_open(file, NULL, inode->i_private);
}

static const struct file_operations gpio_mockup_event_ops = {
	.owner = THIS_MODULE,
	.open = gpio_mockup_event_open,
	.write = gpio_mockup_event_write,
	.llseek = no_llseek,
};

static void gpio_mockup_debugfs_setup(struct device *dev,
				      struct gpio_mockup_chip *chip)
{
	struct gpio_mockup_dbgfs_private *priv;
	struct dentry *evfile;
	struct gpio_chip *gc;
	char *name;
	int i;

	gc = &chip->gc;

	chip->dbg_dir = debugfs_create_dir(gc->label, gpio_mockup_dbg_dir);
	if (!chip->dbg_dir)
		goto err;

	for (i = 0; i < gc->ngpio; i++) {
		name = devm_kasprintf(dev, GFP_KERNEL, "%d", i);
		if (!name)
			goto err;

		priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
		if (!priv)
			goto err;

		priv->chip = chip;
		priv->offset = i;
		priv->desc = &gc->gpiodev->descs[i];

		evfile = debugfs_create_file(name, 0200, chip->dbg_dir, priv,
					     &gpio_mockup_event_ops);
		if (!evfile)
			goto err;
	}

	return;

err:
	dev_err(dev, "error creating debugfs directory\n");
}

static int gpio_mockup_add(struct device *dev,
			   struct gpio_mockup_chip *chip,
			   const char *name, int base, int ngpio)
{
	struct gpio_chip *gc = &chip->gc;
	int ret;

	gc->base = base;
	gc->ngpio = ngpio;
	gc->label = name;
	gc->owner = THIS_MODULE;
	gc->parent = dev;
	gc->get = gpio_mockup_get;
	gc->set = gpio_mockup_set;
	gc->direction_output = gpio_mockup_dirout;
	gc->direction_input = gpio_mockup_dirin;
	gc->get_direction = gpio_mockup_get_direction;
	gc->to_irq = gpio_mockup_to_irq;

	chip->lines = devm_kcalloc(dev, gc->ngpio,
				   sizeof(*chip->lines), GFP_KERNEL);
	if (!chip->lines)
		return -ENOMEM;

	if (gpio_mockup_named_lines) {
		ret = gpio_mockup_name_lines(dev, chip);
		if (ret)
			return ret;
	}

	ret = gpio_mockup_irqchip_setup(dev, chip);
	if (ret)
		return ret;

	ret = devm_gpiochip_add_data(dev, &chip->gc, chip);
	if (ret)
		return ret;

	if (gpio_mockup_dbg_dir)
		gpio_mockup_debugfs_setup(dev, chip);

	return 0;
}

static int gpio_mockup_probe(struct platform_device *pdev)
{
	int ret, i, base, ngpio, num_chips;
	struct device *dev = &pdev->dev;
	struct gpio_mockup_chip *chips;
	char *chip_name;

	if (gpio_mockup_params_nr < 2 || (gpio_mockup_params_nr % 2))
		return -EINVAL;

	/* Each chip is described by two values. */
	num_chips = gpio_mockup_params_nr / 2;

	chips = devm_kcalloc(dev, num_chips, sizeof(*chips), GFP_KERNEL);
	if (!chips)
		return -ENOMEM;

	platform_set_drvdata(pdev, chips);

	for (i = 0; i < num_chips; i++) {
		base = gpio_mockup_ranges[i * 2];

		if (base == -1)
			ngpio = gpio_mockup_ranges[i * 2 + 1];
		else
			ngpio = gpio_mockup_ranges[i * 2 + 1] - base;

		if (ngpio >= 0) {
			chip_name = devm_kasprintf(dev, GFP_KERNEL,
						   "%s-%c", GPIO_MOCKUP_NAME,
						   gpio_mockup_name_start + i);
			if (!chip_name)
				return -ENOMEM;

			ret = gpio_mockup_add(dev, &chips[i],
					      chip_name, base, ngpio);
		} else {
			ret = -EINVAL;
		}

		if (ret) {
			dev_err(dev,
				"adding gpiochip failed: %d (base: %d, ngpio: %d)\n",
				ret, base, base < 0 ? ngpio : base + ngpio);

			return ret;
		}
	}

	return 0;
}

static struct platform_driver gpio_mockup_driver = {
	.driver = {
		.name = GPIO_MOCKUP_NAME,
	},
	.probe = gpio_mockup_probe,
};

static struct platform_device *pdev;
static int __init mock_device_init(void)
{
	int err;

	gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup-event", NULL);
	if (!gpio_mockup_dbg_dir)
		pr_err("%s: error creating debugfs directory\n",
		       GPIO_MOCKUP_NAME);

	pdev = platform_device_alloc(GPIO_MOCKUP_NAME, -1);
	if (!pdev)
		return -ENOMEM;

	err = platform_device_add(pdev);
	if (err) {
		platform_device_put(pdev);
		return err;
	}

	err = platform_driver_register(&gpio_mockup_driver);
	if (err) {
		platform_device_unregister(pdev);
		return err;
	}

	return 0;
}

static void __exit mock_device_exit(void)
{
	debugfs_remove_recursive(gpio_mockup_dbg_dir);
	platform_driver_unregister(&gpio_mockup_driver);
	platform_device_unregister(pdev);
}

module_init(mock_device_init);
module_exit(mock_device_exit);

MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
MODULE_AUTHOR("Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>");
MODULE_AUTHOR("Bartosz Golaszewski <brgl@bgdev.pl>");
MODULE_DESCRIPTION("GPIO Testing driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
0f98dd1b BJZ	1	/*
	2	* GPIO Testing Device Driver
	3	*
	4	* Copyright (C) 2014 Kamlakant Patel <kamlakant.patel@broadcom.com>
	5	* Copyright (C) 2015-2016 Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
c60c7f4c	6	* Copyright (C) 2017 Bartosz Golaszewski <brgl@bgdev.pl>
0f98dd1b BJZ	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/init.h>
	16	#include <linux/module.h>
	17	#include <linux/gpio/driver.h>
9202ba23	18	#include <linux/gpio/consumer.h>
0f98dd1b	19	#include <linux/platform_device.h>
8a68ea00	20	#include <linux/slab.h>
e2ff7408 BG	21	#include <linux/interrupt.h>
	22	#include <linux/irq.h>
	23	#include <linux/irq_work.h>
9202ba23 BG	24	#include <linux/debugfs.h>
	25	#include <linux/uaccess.h>
	26
	27	#include "gpiolib.h"
0f98dd1b	28
ca409160 BG	29	#define GPIO_MOCKUP_NAME "gpio-mockup"
ca409160 BG	30	#define GPIO_MOCKUP_MAX_GC 10
b652336d BG	31	/*
	32	* We're storing two values per chip: the GPIO base and the number
	33	* of GPIO lines.
	34	*/
	35	#define GPIO_MOCKUP_MAX_RANGES (GPIO_MOCKUP_MAX_GC * 2)
0f98dd1b	36
ca409160	37	enum {
c650c00c BG	38	GPIO_MOCKUP_DIR_OUT = 0,
c650c00c BG	39	GPIO_MOCKUP_DIR_IN = 1,
0f98dd1b BJZ	40	};
	41
	42	/*
	43	* struct gpio_pin_status - structure describing a GPIO status
	44	* @dir: Configures direction of gpio as "in" or "out", 0=in, 1=out
	45	* @value: Configures status of the gpio as 0(low) or 1(high)
	46	*/
ca409160 BG	47	struct gpio_mockup_line_status {
ca409160 BG	48	int dir;
0f98dd1b	49	bool value;
c7f5326f	50	bool irq_enabled;
0f98dd1b BJZ	51	};
0f98dd1b BJZ	52
e2ff7408 BG	53	struct gpio_mockup_irq_context {
	54	struct irq_work work;
	55	int irq;
	56	};
	57
ca409160	58	struct gpio_mockup_chip {
0f98dd1b	59	struct gpio_chip gc;
ca409160	60	struct gpio_mockup_line_status *lines;
e2ff7408	61	struct gpio_mockup_irq_context irq_ctx;
9202ba23 BG	62	struct dentry *dbg_dir;
	63	};
	64
	65	struct gpio_mockup_dbgfs_private {
	66	struct gpio_mockup_chip *chip;
	67	struct gpio_desc *desc;
	68	int offset;
0f98dd1b BJZ	69	};
0f98dd1b BJZ	70
b652336d	71	static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_RANGES];
0f98dd1b BJZ	72	static int gpio_mockup_params_nr;
	73	module_param_array(gpio_mockup_ranges, int, &gpio_mockup_params_nr, 0400);
	74
8a68ea00 BG	75	static bool gpio_mockup_named_lines;
	76	module_param_named(gpio_mockup_named_lines,
	77	gpio_mockup_named_lines, bool, 0400);
	78
ca409160	79	static const char gpio_mockup_name_start = 'A';
9202ba23	80	static struct dentry *gpio_mockup_dbg_dir;
0f98dd1b	81
ca409160	82	static int gpio_mockup_get(struct gpio_chip *gc, unsigned int offset)
0f98dd1b	83	{
ca409160	84	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
0f98dd1b	85
ca409160	86	return chip->lines[offset].value;
0f98dd1b BJZ	87	}
0f98dd1b BJZ	88
ca409160	89	static void gpio_mockup_set(struct gpio_chip *gc, unsigned int offset,
0f98dd1b BJZ	90	int value)
0f98dd1b BJZ	91	{
ca409160	92	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
0f98dd1b	93
ca409160	94	chip->lines[offset].value = !!value;
0f98dd1b BJZ	95	}
0f98dd1b BJZ	96
ca409160	97	static int gpio_mockup_dirout(struct gpio_chip *gc, unsigned int offset,
0f98dd1b BJZ	98	int value)
0f98dd1b BJZ	99	{
ca409160 BG	100	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
	101
	102	gpio_mockup_set(gc, offset, value);
c650c00c	103	chip->lines[offset].dir = GPIO_MOCKUP_DIR_OUT;
0f98dd1b	104
0f98dd1b BJZ	105	return 0;
	106	}
	107
ca409160	108	static int gpio_mockup_dirin(struct gpio_chip *gc, unsigned int offset)
0f98dd1b	109	{
ca409160 BG	110	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
ca409160 BG	111
c650c00c	112	chip->lines[offset].dir = GPIO_MOCKUP_DIR_IN;
0f98dd1b	113
0f98dd1b BJZ	114	return 0;
	115	}
	116
ca409160	117	static int gpio_mockup_get_direction(struct gpio_chip *gc, unsigned int offset)
0f98dd1b	118	{
ca409160	119	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
0f98dd1b	120
ca409160	121	return chip->lines[offset].dir;
0f98dd1b BJZ	122	}
0f98dd1b BJZ	123
8a68ea00 BG	124	static int gpio_mockup_name_lines(struct device *dev,
	125	struct gpio_mockup_chip *chip)
	126	{
	127	struct gpio_chip *gc = &chip->gc;
	128	char **names;
	129	int i;
	130
f6ac438e	131	names = devm_kcalloc(dev, gc->ngpio, sizeof(char *), GFP_KERNEL);
8a68ea00 BG	132	if (!names)
	133	return -ENOMEM;
	134
	135	for (i = 0; i < gc->ngpio; i++) {
	136	names[i] = devm_kasprintf(dev, GFP_KERNEL,
	137	"%s-%d", gc->label, i);
	138	if (!names[i])
	139	return -ENOMEM;
	140	}
	141
	142	gc->names = (const char const )names;
	143
	144	return 0;
	145	}
	146
e2ff7408 BG	147	static int gpio_mockup_to_irq(struct gpio_chip *chip, unsigned int offset)
	148	{
	149	return chip->irq_base + offset;
	150	}
	151
c7f5326f BG	152	static void gpio_mockup_irqmask(struct irq_data *data)
	153	{
	154	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
	155	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
	156
	157	chip->lines[data->irq - gc->irq_base].irq_enabled = false;
	158	}
	159
	160	static void gpio_mockup_irqunmask(struct irq_data *data)
	161	{
	162	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
	163	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
	164
	165	chip->lines[data->irq - gc->irq_base].irq_enabled = true;
	166	}
e2ff7408 BG	167
	168	static struct irq_chip gpio_mockup_irqchip = {
	169	.name = GPIO_MOCKUP_NAME,
	170	.irq_mask = gpio_mockup_irqmask,
	171	.irq_unmask = gpio_mockup_irqunmask,
	172	};
	173
	174	static void gpio_mockup_handle_irq(struct irq_work *work)
	175	{
	176	struct gpio_mockup_irq_context *irq_ctx;
	177
	178	irq_ctx = container_of(work, struct gpio_mockup_irq_context, work);
	179	handle_simple_irq(irq_to_desc(irq_ctx->irq));
	180	}
	181
	182	static int gpio_mockup_irqchip_setup(struct device *dev,
	183	struct gpio_mockup_chip *chip)
	184	{
	185	struct gpio_chip *gc = &chip->gc;
	186	int irq_base, i;
	187
62a7ca07	188	irq_base = devm_irq_alloc_descs(dev, -1, 0, gc->ngpio, 0);
e2ff7408 BG	189	if (irq_base < 0)
	190	return irq_base;
	191
	192	gc->irq_base = irq_base;
	193	gc->irqchip = &gpio_mockup_irqchip;
	194
	195	for (i = 0; i < gc->ngpio; i++) {
	196	irq_set_chip(irq_base + i, gc->irqchip);
c7f5326f	197	irq_set_chip_data(irq_base + i, gc);
e2ff7408 BG	198	irq_set_handler(irq_base + i, &handle_simple_irq);
	199	irq_modify_status(irq_base + i,
	200	IRQ_NOREQUEST \| IRQ_NOAUTOEN, IRQ_NOPROBE);
	201	}
	202
	203	init_irq_work(&chip->irq_ctx.work, gpio_mockup_handle_irq);
	204
	205	return 0;
	206	}
	207
9202ba23 BG	208	static ssize_t gpio_mockup_event_write(struct file *file,
	209	const char __user *usr_buf,
	210	size_t size, loff_t *ppos)
	211	{
	212	struct gpio_mockup_dbgfs_private *priv;
	213	struct gpio_mockup_chip *chip;
	214	struct seq_file *sfile;
	215	struct gpio_desc *desc;
	216	struct gpio_chip *gc;
6f9b3e77	217	int rv, val;
9202ba23	218
6f9b3e77 BG	219	rv = kstrtoint_from_user(usr_buf, size, 0, &val);
	220	if (rv)
	221	return rv;
	222	if (val != 0 && val != 1)
	223	return -EINVAL;
	224
650b57b0 BG	225	sfile = file->private_data;
	226	priv = sfile->private;
	227	desc = priv->desc;
	228	chip = priv->chip;
	229	gc = &chip->gc;
c7f5326f	230
650b57b0 BG	231	if (chip->lines[priv->offset].irq_enabled) {
	232	gpiod_set_value_cansleep(desc, val);
	233	priv->chip->irq_ctx.irq = gc->irq_base + priv->offset;
	234	irq_work_queue(&priv->chip->irq_ctx.work);
	235	}
9202ba23 BG	236
	237	return size;
	238	}
	239
	240	static int gpio_mockup_event_open(struct inode inode, struct file file)
	241	{
	242	return single_open(file, NULL, inode->i_private);
	243	}
	244
	245	static const struct file_operations gpio_mockup_event_ops = {
	246	.owner = THIS_MODULE,
	247	.open = gpio_mockup_event_open,
	248	.write = gpio_mockup_event_write,
	249	.llseek = no_llseek,
	250	};
	251
	252	static void gpio_mockup_debugfs_setup(struct device *dev,
	253	struct gpio_mockup_chip *chip)
	254	{
	255	struct gpio_mockup_dbgfs_private *priv;
	256	struct dentry *evfile;
	257	struct gpio_chip *gc;
	258	char *name;
	259	int i;
	260
	261	gc = &chip->gc;
	262
	263	chip->dbg_dir = debugfs_create_dir(gc->label, gpio_mockup_dbg_dir);
	264	if (!chip->dbg_dir)
	265	goto err;
	266
	267	for (i = 0; i < gc->ngpio; i++) {
	268	name = devm_kasprintf(dev, GFP_KERNEL, "%d", i);
	269	if (!name)
	270	goto err;
	271
	272	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	273	if (!priv)
	274	goto err;
	275
	276	priv->chip = chip;
	277	priv->offset = i;
	278	priv->desc = &gc->gpiodev->descs[i];
	279
	280	evfile = debugfs_create_file(name, 0200, chip->dbg_dir, priv,
	281	&gpio_mockup_event_ops);
	282	if (!evfile)
	283	goto err;
	284	}
	285
	286	return;
	287
	288	err:
	289	dev_err(dev, "error creating debugfs directory\n");
	290	}
	291
ca409160 BG	292	static int gpio_mockup_add(struct device *dev,
ca409160 BG	293	struct gpio_mockup_chip *chip,
0f98dd1b BJZ	294	const char *name, int base, int ngpio)
0f98dd1b BJZ	295	{
ca409160	296	struct gpio_chip *gc = &chip->gc;
8a68ea00	297	int ret;
0f98dd1b	298
ca409160 BG	299	gc->base = base;
	300	gc->ngpio = ngpio;
	301	gc->label = name;
	302	gc->owner = THIS_MODULE;
	303	gc->parent = dev;
	304	gc->get = gpio_mockup_get;
	305	gc->set = gpio_mockup_set;
	306	gc->direction_output = gpio_mockup_dirout;
	307	gc->direction_input = gpio_mockup_dirin;
	308	gc->get_direction = gpio_mockup_get_direction;
e2ff7408	309	gc->to_irq = gpio_mockup_to_irq;
ca409160	310
f6ac438e BG	311	chip->lines = devm_kcalloc(dev, gc->ngpio,
f6ac438e BG	312	sizeof(*chip->lines), GFP_KERNEL);
e4ba07bf BG	313	if (!chip->lines)
e4ba07bf BG	314	return -ENOMEM;
ca409160	315
8a68ea00 BG	316	if (gpio_mockup_named_lines) {
	317	ret = gpio_mockup_name_lines(dev, chip);
	318	if (ret)
	319	return ret;
	320	}
	321
e2ff7408 BG	322	ret = gpio_mockup_irqchip_setup(dev, chip);
	323	if (ret)
	324	return ret;
	325
9202ba23 BG	326	ret = devm_gpiochip_add_data(dev, &chip->gc, chip);
	327	if (ret)
	328	return ret;
	329
	330	if (gpio_mockup_dbg_dir)
	331	gpio_mockup_debugfs_setup(dev, chip);
	332
	333	return 0;
0f98dd1b BJZ	334	}
0f98dd1b BJZ	335
ca409160	336	static int gpio_mockup_probe(struct platform_device *pdev)
0f98dd1b	337	{
b652336d	338	int ret, i, base, ngpio, num_chips;
364ac456	339	struct device *dev = &pdev->dev;
b652336d	340	struct gpio_mockup_chip *chips;
ad6d8004	341	char *chip_name;
0f98dd1b	342
b6c2e77d	343	if (gpio_mockup_params_nr < 2 \|\| (gpio_mockup_params_nr % 2))
0f98dd1b BJZ	344	return -EINVAL;
0f98dd1b BJZ	345
b652336d BG	346	/* Each chip is described by two values. */
	347	num_chips = gpio_mockup_params_nr / 2;
	348
f6ac438e	349	chips = devm_kcalloc(dev, num_chips, sizeof(*chips), GFP_KERNEL);
ca409160	350	if (!chips)
0f98dd1b BJZ	351	return -ENOMEM;
0f98dd1b BJZ	352
ca409160	353	platform_set_drvdata(pdev, chips);
0f98dd1b	354
b652336d	355	for (i = 0; i < num_chips; i++) {
0f98dd1b	356	base = gpio_mockup_ranges[i * 2];
ca409160	357
0f98dd1b BJZ	358	if (base == -1)
	359	ngpio = gpio_mockup_ranges[i * 2 + 1];
	360	else
	361	ngpio = gpio_mockup_ranges[i * 2 + 1] - base;
	362
	363	if (ngpio >= 0) {
ad6d8004	364	chip_name = devm_kasprintf(dev, GFP_KERNEL,
ca409160 BG	365	"%s-%c", GPIO_MOCKUP_NAME,
ca409160 BG	366	gpio_mockup_name_start + i);
ad6d8004 BG	367	if (!chip_name)
	368	return -ENOMEM;
	369
ca409160	370	ret = gpio_mockup_add(dev, &chips[i],
0f98dd1b BJZ	371	chip_name, base, ngpio);
0f98dd1b BJZ	372	} else {
4dc9d76c	373	ret = -EINVAL;
0f98dd1b	374	}
ca409160	375
0f98dd1b	376	if (ret) {
ec604f15 BG	377	dev_err(dev,
	378	"adding gpiochip failed: %d (base: %d, ngpio: %d)\n",
	379	ret, base, base < 0 ? ngpio : base + ngpio);
0f98dd1b BJZ	380
	381	return ret;
	382	}
	383	}
	384
	385	return 0;
	386	}
	387
ca409160	388	static struct platform_driver gpio_mockup_driver = {
0f98dd1b	389	.driver = {
ca409160	390	.name = GPIO_MOCKUP_NAME,
364ac456	391	},
ca409160	392	.probe = gpio_mockup_probe,
0f98dd1b BJZ	393	};
	394
	395	static struct platform_device *pdev;
	396	static int __init mock_device_init(void)
	397	{
	398	int err;
	399
9202ba23 BG	400	gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup-event", NULL);
	401	if (!gpio_mockup_dbg_dir)
	402	pr_err("%s: error creating debugfs directory\n",
	403	GPIO_MOCKUP_NAME);
	404
ca409160	405	pdev = platform_device_alloc(GPIO_MOCKUP_NAME, -1);
0f98dd1b BJZ	406	if (!pdev)
	407	return -ENOMEM;
	408
	409	err = platform_device_add(pdev);
	410	if (err) {
	411	platform_device_put(pdev);
	412	return err;
	413	}
	414
ca409160	415	err = platform_driver_register(&gpio_mockup_driver);
0f98dd1b BJZ	416	if (err) {
	417	platform_device_unregister(pdev);
	418	return err;
	419	}
	420
	421	return 0;
	422	}
	423
	424	static void __exit mock_device_exit(void)
	425	{
9202ba23	426	debugfs_remove_recursive(gpio_mockup_dbg_dir);
ca409160	427	platform_driver_unregister(&gpio_mockup_driver);
0f98dd1b BJZ	428	platform_device_unregister(pdev);
	429	}
	430
	431	module_init(mock_device_init);
	432	module_exit(mock_device_exit);
	433
	434	MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
	435	MODULE_AUTHOR("Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>");
c60c7f4c	436	MODULE_AUTHOR("Bartosz Golaszewski <brgl@bgdev.pl>");
0f98dd1b BJZ	437	MODULE_DESCRIPTION("GPIO Testing driver");
0f98dd1b BJZ	438	MODULE_LICENSE("GPL v2");