[mirror_ubuntu-bionic-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_sim.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;
};

struct gpio_mockup_chip {
	struct gpio_chip gc;
	struct gpio_mockup_line_status *lines;
	struct irq_sim irqsim;
	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 *gc, unsigned int offset)
{
	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);

	return irq_sim_irqnum(&chip->irqsim, offset);
}

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;
	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;

	gpiod_set_value_cansleep(desc, val);
	irq_sim_fire(&chip->irqsim, priv->offset);

	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 = devm_irq_sim_init(dev, &chip->irqsim, gc->ngpio);
	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>
e2ff7408 BG	22	#include <linux/irq.h>
b4c495f0	23	#include <linux/irq_sim.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;
e2ff7408 BG	50	};
e2ff7408 BG	51
ca409160	52	struct gpio_mockup_chip {
0f98dd1b	53	struct gpio_chip gc;
ca409160	54	struct gpio_mockup_line_status *lines;
b4c495f0	55	struct irq_sim irqsim;
9202ba23 BG	56	struct dentry *dbg_dir;
	57	};
	58
	59	struct gpio_mockup_dbgfs_private {
	60	struct gpio_mockup_chip *chip;
	61	struct gpio_desc *desc;
	62	int offset;
0f98dd1b BJZ	63	};
0f98dd1b BJZ	64
b652336d	65	static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_RANGES];
0f98dd1b BJZ	66	static int gpio_mockup_params_nr;
	67	module_param_array(gpio_mockup_ranges, int, &gpio_mockup_params_nr, 0400);
	68
8a68ea00 BG	69	static bool gpio_mockup_named_lines;
	70	module_param_named(gpio_mockup_named_lines,
	71	gpio_mockup_named_lines, bool, 0400);
	72
ca409160	73	static const char gpio_mockup_name_start = 'A';
9202ba23	74	static struct dentry *gpio_mockup_dbg_dir;
0f98dd1b	75
ca409160	76	static int gpio_mockup_get(struct gpio_chip *gc, unsigned int offset)
0f98dd1b	77	{
ca409160	78	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
0f98dd1b	79
ca409160	80	return chip->lines[offset].value;
0f98dd1b BJZ	81	}
0f98dd1b BJZ	82
ca409160	83	static void gpio_mockup_set(struct gpio_chip *gc, unsigned int offset,
0f98dd1b BJZ	84	int value)
0f98dd1b BJZ	85	{
ca409160	86	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
0f98dd1b	87
ca409160	88	chip->lines[offset].value = !!value;
0f98dd1b BJZ	89	}
0f98dd1b BJZ	90
ca409160	91	static int gpio_mockup_dirout(struct gpio_chip *gc, unsigned int offset,
0f98dd1b BJZ	92	int value)
0f98dd1b BJZ	93	{
ca409160 BG	94	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
	95
	96	gpio_mockup_set(gc, offset, value);
c650c00c	97	chip->lines[offset].dir = GPIO_MOCKUP_DIR_OUT;
0f98dd1b	98
0f98dd1b BJZ	99	return 0;
	100	}
	101
ca409160	102	static int gpio_mockup_dirin(struct gpio_chip *gc, unsigned int offset)
0f98dd1b	103	{
ca409160 BG	104	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
ca409160 BG	105
c650c00c	106	chip->lines[offset].dir = GPIO_MOCKUP_DIR_IN;
0f98dd1b	107
0f98dd1b BJZ	108	return 0;
	109	}
	110
ca409160	111	static int gpio_mockup_get_direction(struct gpio_chip *gc, unsigned int offset)
0f98dd1b	112	{
ca409160	113	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
0f98dd1b	114
ca409160	115	return chip->lines[offset].dir;
0f98dd1b BJZ	116	}
0f98dd1b BJZ	117
8a68ea00 BG	118	static int gpio_mockup_name_lines(struct device *dev,
	119	struct gpio_mockup_chip *chip)
	120	{
	121	struct gpio_chip *gc = &chip->gc;
	122	char **names;
	123	int i;
	124
f6ac438e	125	names = devm_kcalloc(dev, gc->ngpio, sizeof(char *), GFP_KERNEL);
8a68ea00 BG	126	if (!names)
	127	return -ENOMEM;
	128
	129	for (i = 0; i < gc->ngpio; i++) {
	130	names[i] = devm_kasprintf(dev, GFP_KERNEL,
	131	"%s-%d", gc->label, i);
	132	if (!names[i])
	133	return -ENOMEM;
	134	}
	135
	136	gc->names = (const char const )names;
	137
	138	return 0;
	139	}
	140
b4c495f0	141	static int gpio_mockup_to_irq(struct gpio_chip *gc, unsigned int offset)
c7f5326f	142	{
c7f5326f BG	143	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
c7f5326f BG	144
b4c495f0	145	return irq_sim_irqnum(&chip->irqsim, offset);
e2ff7408 BG	146	}
e2ff7408 BG	147
9202ba23 BG	148	static ssize_t gpio_mockup_event_write(struct file *file,
	149	const char __user *usr_buf,
	150	size_t size, loff_t *ppos)
	151	{
	152	struct gpio_mockup_dbgfs_private *priv;
	153	struct gpio_mockup_chip *chip;
	154	struct seq_file *sfile;
	155	struct gpio_desc *desc;
6f9b3e77	156	int rv, val;
9202ba23	157
6f9b3e77 BG	158	rv = kstrtoint_from_user(usr_buf, size, 0, &val);
	159	if (rv)
	160	return rv;
	161	if (val != 0 && val != 1)
	162	return -EINVAL;
	163
650b57b0 BG	164	sfile = file->private_data;
	165	priv = sfile->private;
	166	desc = priv->desc;
	167	chip = priv->chip;
c7f5326f	168
b4c495f0 BG	169	gpiod_set_value_cansleep(desc, val);
b4c495f0 BG	170	irq_sim_fire(&chip->irqsim, priv->offset);
9202ba23 BG	171
	172	return size;
	173	}
	174
	175	static int gpio_mockup_event_open(struct inode inode, struct file file)
	176	{
	177	return single_open(file, NULL, inode->i_private);
	178	}
	179
	180	static const struct file_operations gpio_mockup_event_ops = {
	181	.owner = THIS_MODULE,
	182	.open = gpio_mockup_event_open,
	183	.write = gpio_mockup_event_write,
	184	.llseek = no_llseek,
	185	};
	186
	187	static void gpio_mockup_debugfs_setup(struct device *dev,
	188	struct gpio_mockup_chip *chip)
	189	{
	190	struct gpio_mockup_dbgfs_private *priv;
	191	struct dentry *evfile;
	192	struct gpio_chip *gc;
	193	char *name;
	194	int i;
	195
	196	gc = &chip->gc;
	197
	198	chip->dbg_dir = debugfs_create_dir(gc->label, gpio_mockup_dbg_dir);
	199	if (!chip->dbg_dir)
	200	goto err;
	201
	202	for (i = 0; i < gc->ngpio; i++) {
	203	name = devm_kasprintf(dev, GFP_KERNEL, "%d", i);
	204	if (!name)
	205	goto err;
	206
	207	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	208	if (!priv)
	209	goto err;
	210
	211	priv->chip = chip;
	212	priv->offset = i;
	213	priv->desc = &gc->gpiodev->descs[i];
	214
	215	evfile = debugfs_create_file(name, 0200, chip->dbg_dir, priv,
	216	&gpio_mockup_event_ops);
	217	if (!evfile)
	218	goto err;
	219	}
	220
	221	return;
	222
	223	err:
	224	dev_err(dev, "error creating debugfs directory\n");
	225	}
	226
ca409160 BG	227	static int gpio_mockup_add(struct device *dev,
ca409160 BG	228	struct gpio_mockup_chip *chip,
0f98dd1b BJZ	229	const char *name, int base, int ngpio)
0f98dd1b BJZ	230	{
ca409160	231	struct gpio_chip *gc = &chip->gc;
8a68ea00	232	int ret;
0f98dd1b	233
ca409160 BG	234	gc->base = base;
	235	gc->ngpio = ngpio;
	236	gc->label = name;
	237	gc->owner = THIS_MODULE;
	238	gc->parent = dev;
	239	gc->get = gpio_mockup_get;
	240	gc->set = gpio_mockup_set;
	241	gc->direction_output = gpio_mockup_dirout;
	242	gc->direction_input = gpio_mockup_dirin;
	243	gc->get_direction = gpio_mockup_get_direction;
e2ff7408	244	gc->to_irq = gpio_mockup_to_irq;
ca409160	245
f6ac438e BG	246	chip->lines = devm_kcalloc(dev, gc->ngpio,
f6ac438e BG	247	sizeof(*chip->lines), GFP_KERNEL);
e4ba07bf BG	248	if (!chip->lines)
e4ba07bf BG	249	return -ENOMEM;
ca409160	250
8a68ea00 BG	251	if (gpio_mockup_named_lines) {
	252	ret = gpio_mockup_name_lines(dev, chip);
	253	if (ret)
	254	return ret;
	255	}
	256
b4c495f0	257	ret = devm_irq_sim_init(dev, &chip->irqsim, gc->ngpio);
e2ff7408 BG	258	if (ret)
	259	return ret;
	260
9202ba23 BG	261	ret = devm_gpiochip_add_data(dev, &chip->gc, chip);
	262	if (ret)
	263	return ret;
	264
	265	if (gpio_mockup_dbg_dir)
	266	gpio_mockup_debugfs_setup(dev, chip);
	267
	268	return 0;
0f98dd1b BJZ	269	}
0f98dd1b BJZ	270
ca409160	271	static int gpio_mockup_probe(struct platform_device *pdev)
0f98dd1b	272	{
b652336d	273	int ret, i, base, ngpio, num_chips;
364ac456	274	struct device *dev = &pdev->dev;
b652336d	275	struct gpio_mockup_chip *chips;
ad6d8004	276	char *chip_name;
0f98dd1b	277
b6c2e77d	278	if (gpio_mockup_params_nr < 2 \|\| (gpio_mockup_params_nr % 2))
0f98dd1b BJZ	279	return -EINVAL;
0f98dd1b BJZ	280
b652336d BG	281	/* Each chip is described by two values. */
	282	num_chips = gpio_mockup_params_nr / 2;
	283
f6ac438e	284	chips = devm_kcalloc(dev, num_chips, sizeof(*chips), GFP_KERNEL);
ca409160	285	if (!chips)
0f98dd1b BJZ	286	return -ENOMEM;
0f98dd1b BJZ	287
ca409160	288	platform_set_drvdata(pdev, chips);
0f98dd1b	289
b652336d	290	for (i = 0; i < num_chips; i++) {
0f98dd1b	291	base = gpio_mockup_ranges[i * 2];
ca409160	292
0f98dd1b BJZ	293	if (base == -1)
	294	ngpio = gpio_mockup_ranges[i * 2 + 1];
	295	else
	296	ngpio = gpio_mockup_ranges[i * 2 + 1] - base;
	297
	298	if (ngpio >= 0) {
ad6d8004	299	chip_name = devm_kasprintf(dev, GFP_KERNEL,
ca409160 BG	300	"%s-%c", GPIO_MOCKUP_NAME,
ca409160 BG	301	gpio_mockup_name_start + i);
ad6d8004 BG	302	if (!chip_name)
	303	return -ENOMEM;
	304
ca409160	305	ret = gpio_mockup_add(dev, &chips[i],
0f98dd1b BJZ	306	chip_name, base, ngpio);
0f98dd1b BJZ	307	} else {
4dc9d76c	308	ret = -EINVAL;
0f98dd1b	309	}
ca409160	310
0f98dd1b	311	if (ret) {
ec604f15 BG	312	dev_err(dev,
	313	"adding gpiochip failed: %d (base: %d, ngpio: %d)\n",
	314	ret, base, base < 0 ? ngpio : base + ngpio);
0f98dd1b BJZ	315
	316	return ret;
	317	}
	318	}
	319
	320	return 0;
	321	}
	322
ca409160	323	static struct platform_driver gpio_mockup_driver = {
0f98dd1b	324	.driver = {
ca409160	325	.name = GPIO_MOCKUP_NAME,
364ac456	326	},
ca409160	327	.probe = gpio_mockup_probe,
0f98dd1b BJZ	328	};
	329
	330	static struct platform_device *pdev;
	331	static int __init mock_device_init(void)
	332	{
	333	int err;
	334
9202ba23 BG	335	gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup-event", NULL);
	336	if (!gpio_mockup_dbg_dir)
	337	pr_err("%s: error creating debugfs directory\n",
	338	GPIO_MOCKUP_NAME);
	339
ca409160	340	pdev = platform_device_alloc(GPIO_MOCKUP_NAME, -1);
0f98dd1b BJZ	341	if (!pdev)
	342	return -ENOMEM;
	343
	344	err = platform_device_add(pdev);
	345	if (err) {
	346	platform_device_put(pdev);
	347	return err;
	348	}
	349
ca409160	350	err = platform_driver_register(&gpio_mockup_driver);
0f98dd1b BJZ	351	if (err) {
	352	platform_device_unregister(pdev);
	353	return err;
	354	}
	355
	356	return 0;
	357	}
	358
	359	static void __exit mock_device_exit(void)
	360	{
9202ba23	361	debugfs_remove_recursive(gpio_mockup_dbg_dir);
ca409160	362	platform_driver_unregister(&gpio_mockup_driver);
0f98dd1b BJZ	363	platform_device_unregister(pdev);
	364	}
	365
	366	module_init(mock_device_init);
	367	module_exit(mock_device_exit);
	368
	369	MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
	370	MODULE_AUTHOR("Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>");
c60c7f4c	371	MODULE_AUTHOR("Bartosz Golaszewski <brgl@bgdev.pl>");
0f98dd1b BJZ	372	MODULE_DESCRIPTION("GPIO Testing driver");
0f98dd1b BJZ	373	MODULE_LICENSE("GPL v2");