[linux-2.6-block.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)

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

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;
};

struct gpio_mockup_platform_data {
	int base;
	int ngpio;
	int index;
	bool named_lines;
};

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 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_probe(struct platform_device *pdev)
{
	struct gpio_mockup_platform_data *pdata;
	struct gpio_mockup_chip *chip;
	struct gpio_chip *gc;
	int rv, base, ngpio;
	struct device *dev;
	char *name;

	dev = &pdev->dev;
	pdata = dev_get_platdata(dev);
	base = pdata->base;
	ngpio = pdata->ngpio;

	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	name = devm_kasprintf(dev, GFP_KERNEL, "%s-%c",
			      pdev->name, pdata->index);
	if (!name)
		return -ENOMEM;

	gc = &chip->gc;
	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 (pdata->named_lines) {
		rv = gpio_mockup_name_lines(dev, chip);
		if (rv)
			return rv;
	}

	rv = devm_irq_sim_init(dev, &chip->irqsim, gc->ngpio);
	if (rv)
		return rv;

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

	if (gpio_mockup_dbg_dir)
		gpio_mockup_debugfs_setup(dev, chip);

	return 0;
}

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

static struct platform_device *gpio_mockup_pdevs[GPIO_MOCKUP_MAX_GC];

static void gpio_mockup_unregister_pdevs(void)
{
	struct platform_device *pdev;
	int i;

	for (i = 0; i < GPIO_MOCKUP_MAX_GC; i++) {
		pdev = gpio_mockup_pdevs[i];

		if (pdev)
			platform_device_unregister(pdev);
	}
}

static int __init gpio_mockup_init(void)
{
	int i, num_chips, err = 0, index = 'A';
	struct gpio_mockup_platform_data pdata;
	struct platform_device *pdev;

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

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

	gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup-event", NULL);
	if (!gpio_mockup_dbg_dir)
		gpio_mockup_err("error creating debugfs directory\n");

	err = platform_driver_register(&gpio_mockup_driver);
	if (err) {
		gpio_mockup_err("error registering platform driver\n");
		return err;
	}

	for (i = 0; i < num_chips; i++) {
		pdata.index = index++;
		pdata.base = gpio_mockup_ranges[i * 2];
		pdata.ngpio = pdata.base < 0
				? gpio_mockup_ranges[i * 2 + 1]
				: gpio_mockup_ranges[i * 2 + 1] - pdata.base;
		pdata.named_lines = gpio_mockup_named_lines;

		pdev = platform_device_register_resndata(NULL,
							 GPIO_MOCKUP_NAME,
							 i, NULL, 0, &pdata,
							 sizeof(pdata));
		if (!pdev) {
			gpio_mockup_err("error registering device");
			platform_driver_unregister(&gpio_mockup_driver);
			gpio_mockup_unregister_pdevs();
			return -ENOMEM;
		}

		gpio_mockup_pdevs[i] = pdev;
	}

	return 0;
}

static void __exit gpio_mockup_exit(void)
{
	debugfs_remove_recursive(gpio_mockup_dbg_dir);
	platform_driver_unregister(&gpio_mockup_driver);
	gpio_mockup_unregister_pdevs();
}

module_init(gpio_mockup_init);
module_exit(gpio_mockup_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	29	#define GPIO_MOCKUP_NAME "gpio-mockup"
b9576d03	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
f1bec99a BG	37	#define gpio_mockup_err(...) pr_err(GPIO_MOCKUP_NAME ": " __VA_ARGS__)
f1bec99a BG	38
ca409160	39	enum {
c650c00c BG	40	GPIO_MOCKUP_DIR_OUT = 0,
c650c00c BG	41	GPIO_MOCKUP_DIR_IN = 1,
0f98dd1b BJZ	42	};
	43
	44	/*
	45	* struct gpio_pin_status - structure describing a GPIO status
	46	* @dir: Configures direction of gpio as "in" or "out", 0=in, 1=out
	47	* @value: Configures status of the gpio as 0(low) or 1(high)
	48	*/
ca409160 BG	49	struct gpio_mockup_line_status {
ca409160 BG	50	int dir;
0f98dd1b	51	bool value;
e2ff7408 BG	52	};
e2ff7408 BG	53
ca409160	54	struct gpio_mockup_chip {
0f98dd1b	55	struct gpio_chip gc;
ca409160	56	struct gpio_mockup_line_status *lines;
b4c495f0	57	struct irq_sim irqsim;
9202ba23 BG	58	struct dentry *dbg_dir;
	59	};
	60
	61	struct gpio_mockup_dbgfs_private {
	62	struct gpio_mockup_chip *chip;
	63	struct gpio_desc *desc;
	64	int offset;
0f98dd1b BJZ	65	};
0f98dd1b BJZ	66
8a39f597 BG	67	struct gpio_mockup_platform_data {
	68	int base;
	69	int ngpio;
	70	int index;
c3196a78	71	bool named_lines;
8a39f597 BG	72	};
8a39f597 BG	73
b652336d	74	static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_RANGES];
0f98dd1b BJZ	75	static int gpio_mockup_params_nr;
	76	module_param_array(gpio_mockup_ranges, int, &gpio_mockup_params_nr, 0400);
	77
8a68ea00 BG	78	static bool gpio_mockup_named_lines;
	79	module_param_named(gpio_mockup_named_lines,
	80	gpio_mockup_named_lines, bool, 0400);
	81
9202ba23	82	static struct dentry *gpio_mockup_dbg_dir;
0f98dd1b	83
ca409160	84	static int gpio_mockup_get(struct gpio_chip *gc, unsigned int offset)
0f98dd1b	85	{
ca409160	86	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
0f98dd1b	87
ca409160	88	return chip->lines[offset].value;
0f98dd1b BJZ	89	}
0f98dd1b BJZ	90
ca409160	91	static void gpio_mockup_set(struct gpio_chip *gc, unsigned int offset,
0f98dd1b BJZ	92	int value)
0f98dd1b BJZ	93	{
ca409160	94	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
0f98dd1b	95
ca409160	96	chip->lines[offset].value = !!value;
0f98dd1b BJZ	97	}
0f98dd1b BJZ	98
ca409160	99	static int gpio_mockup_dirout(struct gpio_chip *gc, unsigned int offset,
0f98dd1b BJZ	100	int value)
0f98dd1b BJZ	101	{
ca409160 BG	102	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
	103
	104	gpio_mockup_set(gc, offset, value);
c650c00c	105	chip->lines[offset].dir = GPIO_MOCKUP_DIR_OUT;
0f98dd1b	106
0f98dd1b BJZ	107	return 0;
	108	}
	109
ca409160	110	static int gpio_mockup_dirin(struct gpio_chip *gc, unsigned int offset)
0f98dd1b	111	{
ca409160 BG	112	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
ca409160 BG	113
c650c00c	114	chip->lines[offset].dir = GPIO_MOCKUP_DIR_IN;
0f98dd1b	115
0f98dd1b BJZ	116	return 0;
	117	}
	118
ca409160	119	static int gpio_mockup_get_direction(struct gpio_chip *gc, unsigned int offset)
0f98dd1b	120	{
ca409160	121	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
0f98dd1b	122
ca409160	123	return chip->lines[offset].dir;
0f98dd1b BJZ	124	}
0f98dd1b BJZ	125
8a68ea00 BG	126	static int gpio_mockup_name_lines(struct device *dev,
	127	struct gpio_mockup_chip *chip)
	128	{
	129	struct gpio_chip *gc = &chip->gc;
	130	char **names;
	131	int i;
	132
f6ac438e	133	names = devm_kcalloc(dev, gc->ngpio, sizeof(char *), GFP_KERNEL);
8a68ea00 BG	134	if (!names)
	135	return -ENOMEM;
	136
	137	for (i = 0; i < gc->ngpio; i++) {
	138	names[i] = devm_kasprintf(dev, GFP_KERNEL,
	139	"%s-%d", gc->label, i);
	140	if (!names[i])
	141	return -ENOMEM;
	142	}
	143
	144	gc->names = (const char const )names;
	145
	146	return 0;
	147	}
	148
b4c495f0	149	static int gpio_mockup_to_irq(struct gpio_chip *gc, unsigned int offset)
c7f5326f	150	{
c7f5326f BG	151	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
c7f5326f BG	152
b4c495f0	153	return irq_sim_irqnum(&chip->irqsim, offset);
e2ff7408 BG	154	}
e2ff7408 BG	155
9202ba23 BG	156	static ssize_t gpio_mockup_event_write(struct file *file,
	157	const char __user *usr_buf,
	158	size_t size, loff_t *ppos)
	159	{
	160	struct gpio_mockup_dbgfs_private *priv;
	161	struct gpio_mockup_chip *chip;
	162	struct seq_file *sfile;
	163	struct gpio_desc *desc;
6f9b3e77	164	int rv, val;
9202ba23	165
6f9b3e77 BG	166	rv = kstrtoint_from_user(usr_buf, size, 0, &val);
	167	if (rv)
	168	return rv;
	169	if (val != 0 && val != 1)
	170	return -EINVAL;
	171
650b57b0 BG	172	sfile = file->private_data;
	173	priv = sfile->private;
	174	desc = priv->desc;
	175	chip = priv->chip;
c7f5326f	176
b4c495f0 BG	177	gpiod_set_value_cansleep(desc, val);
b4c495f0 BG	178	irq_sim_fire(&chip->irqsim, priv->offset);
9202ba23 BG	179
	180	return size;
	181	}
	182
	183	static int gpio_mockup_event_open(struct inode inode, struct file file)
	184	{
	185	return single_open(file, NULL, inode->i_private);
	186	}
	187
	188	static const struct file_operations gpio_mockup_event_ops = {
	189	.owner = THIS_MODULE,
	190	.open = gpio_mockup_event_open,
	191	.write = gpio_mockup_event_write,
	192	.llseek = no_llseek,
	193	};
	194
	195	static void gpio_mockup_debugfs_setup(struct device *dev,
	196	struct gpio_mockup_chip *chip)
	197	{
	198	struct gpio_mockup_dbgfs_private *priv;
	199	struct dentry *evfile;
	200	struct gpio_chip *gc;
	201	char *name;
	202	int i;
	203
	204	gc = &chip->gc;
	205
	206	chip->dbg_dir = debugfs_create_dir(gc->label, gpio_mockup_dbg_dir);
	207	if (!chip->dbg_dir)
	208	goto err;
	209
	210	for (i = 0; i < gc->ngpio; i++) {
	211	name = devm_kasprintf(dev, GFP_KERNEL, "%d", i);
	212	if (!name)
	213	goto err;
	214
	215	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	216	if (!priv)
	217	goto err;
	218
	219	priv->chip = chip;
	220	priv->offset = i;
	221	priv->desc = &gc->gpiodev->descs[i];
	222
	223	evfile = debugfs_create_file(name, 0200, chip->dbg_dir, priv,
	224	&gpio_mockup_event_ops);
	225	if (!evfile)
	226	goto err;
	227	}
	228
	229	return;
	230
	231	err:
	232	dev_err(dev, "error creating debugfs directory\n");
	233	}
	234
6d974d32	235	static int gpio_mockup_probe(struct platform_device *pdev)
0f98dd1b	236	{
6d974d32 BG	237	struct gpio_mockup_platform_data *pdata;
	238	struct gpio_mockup_chip *chip;
	239	struct gpio_chip *gc;
	240	int rv, base, ngpio;
	241	struct device *dev;
	242	char *name;
	243
	244	dev = &pdev->dev;
	245	pdata = dev_get_platdata(dev);
	246	base = pdata->base;
	247	ngpio = pdata->ngpio;
	248
	249	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
	250	if (!chip)
	251	return -ENOMEM;
	252
	253	name = devm_kasprintf(dev, GFP_KERNEL, "%s-%c",
	254	pdev->name, pdata->index);
	255	if (!name)
	256	return -ENOMEM;
0f98dd1b	257
6d974d32	258	gc = &chip->gc;
ca409160 BG	259	gc->base = base;
	260	gc->ngpio = ngpio;
	261	gc->label = name;
	262	gc->owner = THIS_MODULE;
	263	gc->parent = dev;
	264	gc->get = gpio_mockup_get;
	265	gc->set = gpio_mockup_set;
	266	gc->direction_output = gpio_mockup_dirout;
	267	gc->direction_input = gpio_mockup_dirin;
	268	gc->get_direction = gpio_mockup_get_direction;
e2ff7408	269	gc->to_irq = gpio_mockup_to_irq;
ca409160	270
f6ac438e BG	271	chip->lines = devm_kcalloc(dev, gc->ngpio,
f6ac438e BG	272	sizeof(*chip->lines), GFP_KERNEL);
e4ba07bf BG	273	if (!chip->lines)
e4ba07bf BG	274	return -ENOMEM;
ca409160	275
c3196a78	276	if (pdata->named_lines) {
6d974d32 BG	277	rv = gpio_mockup_name_lines(dev, chip);
	278	if (rv)
	279	return rv;
8a68ea00 BG	280	}
8a68ea00 BG	281
6d974d32 BG	282	rv = devm_irq_sim_init(dev, &chip->irqsim, gc->ngpio);
	283	if (rv)
	284	return rv;
e2ff7408	285
6d974d32 BG	286	rv = devm_gpiochip_add_data(dev, &chip->gc, chip);
	287	if (rv)
	288	return rv;
9202ba23 BG	289
	290	if (gpio_mockup_dbg_dir)
	291	gpio_mockup_debugfs_setup(dev, chip);
	292
	293	return 0;
0f98dd1b BJZ	294	}
0f98dd1b BJZ	295
ca409160	296	static struct platform_driver gpio_mockup_driver = {
0f98dd1b	297	.driver = {
ca409160	298	.name = GPIO_MOCKUP_NAME,
364ac456	299	},
ca409160	300	.probe = gpio_mockup_probe,
0f98dd1b BJZ	301	};
0f98dd1b BJZ	302
8a39f597 BG	303	static struct platform_device *gpio_mockup_pdevs[GPIO_MOCKUP_MAX_GC];
	304
	305	static void gpio_mockup_unregister_pdevs(void)
	306	{
	307	struct platform_device *pdev;
	308	int i;
	309
	310	for (i = 0; i < GPIO_MOCKUP_MAX_GC; i++) {
	311	pdev = gpio_mockup_pdevs[i];
	312
	313	if (pdev)
	314	platform_device_unregister(pdev);
	315	}
	316	}
f3b47170 BG	317
f3b47170 BG	318	static int __init gpio_mockup_init(void)
0f98dd1b	319	{
8a39f597 BG	320	int i, num_chips, err = 0, index = 'A';
	321	struct gpio_mockup_platform_data pdata;
	322	struct platform_device *pdev;
0f98dd1b	323
b447a751 BG	324	if ((gpio_mockup_params_nr < 2) \|\|
	325	(gpio_mockup_params_nr % 2) \|\|
	326	(gpio_mockup_params_nr > GPIO_MOCKUP_MAX_RANGES))
20c35ac4 BG	327	return -EINVAL;
20c35ac4 BG	328
8a39f597 BG	329	/* Each chip is described by two values. */
	330	num_chips = gpio_mockup_params_nr / 2;
	331
9202ba23 BG	332	gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup-event", NULL);
9202ba23 BG	333	if (!gpio_mockup_dbg_dir)
f1bec99a	334	gpio_mockup_err("error creating debugfs directory\n");
9202ba23	335
8a39f597	336	err = platform_driver_register(&gpio_mockup_driver);
0f98dd1b	337	if (err) {
f1bec99a	338	gpio_mockup_err("error registering platform driver\n");
0f98dd1b BJZ	339	return err;
	340	}
	341
8a39f597 BG	342	for (i = 0; i < num_chips; i++) {
	343	pdata.index = index++;
	344	pdata.base = gpio_mockup_ranges[i * 2];
	345	pdata.ngpio = pdata.base < 0
	346	? gpio_mockup_ranges[i * 2 + 1]
	347	: gpio_mockup_ranges[i * 2 + 1] - pdata.base;
c3196a78	348	pdata.named_lines = gpio_mockup_named_lines;
8a39f597 BG	349
	350	pdev = platform_device_register_resndata(NULL,
	351	GPIO_MOCKUP_NAME,
	352	i, NULL, 0, &pdata,
	353	sizeof(pdata));
	354	if (!pdev) {
f1bec99a	355	gpio_mockup_err("error registering device");
8a39f597 BG	356	platform_driver_unregister(&gpio_mockup_driver);
	357	gpio_mockup_unregister_pdevs();
	358	return -ENOMEM;
	359	}
	360
	361	gpio_mockup_pdevs[i] = pdev;
0f98dd1b BJZ	362	}
	363
	364	return 0;
	365	}
	366
f3b47170	367	static void __exit gpio_mockup_exit(void)
0f98dd1b	368	{
9202ba23	369	debugfs_remove_recursive(gpio_mockup_dbg_dir);
ca409160	370	platform_driver_unregister(&gpio_mockup_driver);
8a39f597	371	gpio_mockup_unregister_pdevs();
0f98dd1b BJZ	372	}
0f98dd1b BJZ	373
f3b47170 BG	374	module_init(gpio_mockup_init);
f3b47170 BG	375	module_exit(gpio_mockup_exit);
0f98dd1b BJZ	376
	377	MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
	378	MODULE_AUTHOR("Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>");
c60c7f4c	379	MODULE_AUTHOR("Bartosz Golaszewski <brgl@bgdev.pl>");
0f98dd1b BJZ	380	MODULE_DESCRIPTION("GPIO Testing driver");
0f98dd1b BJZ	381	MODULE_LICENSE("GPL v2");