[linux.git] / drivers / gpio / gpio-mockup.c

/*
 * GPIO Testing Device Driver
 *
 * Copyright (C) 2014  Kamlakant Patel <[email protected]>
 * Copyright (C) 2015-2016  Bamvor Jian Zhang <[email protected]>
 * Copyright (C) 2017 Bartosz Golaszewski <[email protected]>
 *
 * 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;
	int 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_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_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 void gpio_mockup_set_multiple(struct gpio_chip *gc,
				     unsigned long *mask, unsigned long *bits)
{
	unsigned int bit;

	for_each_set_bit(bit, mask, gc->ngpio)
		gpio_mockup_set(gc, bit, test_bit(bit, bits));

}

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_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, *link;
	struct gpio_chip *gc;
	const char *devname;
	char *name;
	int i;

	gc = &chip->gc;
	devname = dev_name(&gc->gpiodev->dev);

	chip->dbg_dir = debugfs_create_dir(devname, gpio_mockup_dbg_dir);
	if (IS_ERR_OR_NULL(chip->dbg_dir))
		goto err;

	link = debugfs_create_symlink(gc->label, gpio_mockup_dbg_dir, devname);
	if (IS_ERR_OR_NULL(link))
		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 (IS_ERR_OR_NULL(evfile))
			goto err;
	}

	return;

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

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_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->set_multiple = gpio_mockup_set_multiple;
	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 < 0)
		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_num_ranges < 2) ||
	    (gpio_mockup_num_ranges % 2) ||
	    (gpio_mockup_num_ranges > GPIO_MOCKUP_MAX_RANGES))
		return -EINVAL;

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

	/*
	 * The second value in the <base GPIO - number of GPIOS> pair must
	 * always be greater than 0.
	 */
	for (i = 0; i < num_chips; i++) {
		if (gpio_mockup_range_ngpio(i) < 0)
			return -EINVAL;
	}

	gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup-event", NULL);
	if (IS_ERR_OR_NULL(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_range_base(i);
		pdata.ngpio = pdata.base < 0
				? gpio_mockup_range_ngpio(i)
				: gpio_mockup_range_ngpio(i) - 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 (IS_ERR(pdev)) {
			gpio_mockup_err("error registering device");
			platform_driver_unregister(&gpio_mockup_driver);
			gpio_mockup_unregister_pdevs();
			return PTR_ERR(pdev);
		}

		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 <[email protected]>");
MODULE_AUTHOR("Bamvor Jian Zhang <[email protected]>");
MODULE_AUTHOR("Bartosz Golaszewski <[email protected]>");
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 <[email protected]>
	5	* Copyright (C) 2015-2016 Bamvor Jian Zhang <[email protected]>
c60c7f4c	6	* Copyright (C) 2017 Bartosz Golaszewski <[email protected]>
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;
5b7908c0	51	int 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];
e63a006f BG	75	static int gpio_mockup_num_ranges;
e63a006f BG	76	module_param_array(gpio_mockup_ranges, int, &gpio_mockup_num_ranges, 0400);
0f98dd1b	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
cd9835f1 BG	84	static int gpio_mockup_range_base(unsigned int index)
	85	{
	86	return gpio_mockup_ranges[index * 2];
	87	}
	88
	89	static int gpio_mockup_range_ngpio(unsigned int index)
	90	{
	91	return gpio_mockup_ranges[index * 2 + 1];
	92	}
	93
ca409160	94	static int gpio_mockup_get(struct gpio_chip *gc, unsigned int offset)
0f98dd1b	95	{
ca409160	96	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
0f98dd1b	97
ca409160	98	return chip->lines[offset].value;
0f98dd1b BJZ	99	}
0f98dd1b BJZ	100
2a9d742c BG	101	static void gpio_mockup_set(struct gpio_chip *gc,
2a9d742c BG	102	unsigned int offset, int value)
0f98dd1b	103	{
ca409160	104	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
0f98dd1b	105
ca409160	106	chip->lines[offset].value = !!value;
0f98dd1b BJZ	107	}
0f98dd1b BJZ	108
c47bee95 BG	109	static void gpio_mockup_set_multiple(struct gpio_chip *gc,
	110	unsigned long mask, unsigned long bits)
	111	{
	112	unsigned int bit;
	113
	114	for_each_set_bit(bit, mask, gc->ngpio)
	115	gpio_mockup_set(gc, bit, test_bit(bit, bits));
	116
	117	}
	118
2a9d742c BG	119	static int gpio_mockup_dirout(struct gpio_chip *gc,
2a9d742c BG	120	unsigned int offset, int value)
0f98dd1b	121	{
ca409160 BG	122	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
	123
	124	gpio_mockup_set(gc, offset, value);
c650c00c	125	chip->lines[offset].dir = GPIO_MOCKUP_DIR_OUT;
0f98dd1b	126
0f98dd1b BJZ	127	return 0;
	128	}
	129
ca409160	130	static int gpio_mockup_dirin(struct gpio_chip *gc, unsigned int offset)
0f98dd1b	131	{
ca409160 BG	132	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
ca409160 BG	133
c650c00c	134	chip->lines[offset].dir = GPIO_MOCKUP_DIR_IN;
0f98dd1b	135
0f98dd1b BJZ	136	return 0;
	137	}
	138
ca409160	139	static int gpio_mockup_get_direction(struct gpio_chip *gc, unsigned int offset)
0f98dd1b	140	{
ca409160	141	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
0f98dd1b	142
ca409160	143	return chip->lines[offset].dir;
0f98dd1b BJZ	144	}
0f98dd1b BJZ	145
b4c495f0	146	static int gpio_mockup_to_irq(struct gpio_chip *gc, unsigned int offset)
c7f5326f	147	{
c7f5326f BG	148	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
c7f5326f BG	149
b4c495f0	150	return irq_sim_irqnum(&chip->irqsim, offset);
e2ff7408 BG	151	}
e2ff7408 BG	152
9202ba23 BG	153	static ssize_t gpio_mockup_event_write(struct file *file,
	154	const char __user *usr_buf,
	155	size_t size, loff_t *ppos)
	156	{
	157	struct gpio_mockup_dbgfs_private *priv;
	158	struct gpio_mockup_chip *chip;
	159	struct seq_file *sfile;
	160	struct gpio_desc *desc;
6f9b3e77	161	int rv, val;
9202ba23	162
6f9b3e77 BG	163	rv = kstrtoint_from_user(usr_buf, size, 0, &val);
	164	if (rv)
	165	return rv;
	166	if (val != 0 && val != 1)
	167	return -EINVAL;
	168
650b57b0 BG	169	sfile = file->private_data;
	170	priv = sfile->private;
	171	desc = priv->desc;
	172	chip = priv->chip;
c7f5326f	173
b4c495f0 BG	174	gpiod_set_value_cansleep(desc, val);
b4c495f0 BG	175	irq_sim_fire(&chip->irqsim, priv->offset);
9202ba23 BG	176
	177	return size;
	178	}
	179
	180	static int gpio_mockup_event_open(struct inode inode, struct file file)
	181	{
	182	return single_open(file, NULL, inode->i_private);
	183	}
	184
	185	static const struct file_operations gpio_mockup_event_ops = {
	186	.owner = THIS_MODULE,
	187	.open = gpio_mockup_event_open,
	188	.write = gpio_mockup_event_write,
	189	.llseek = no_llseek,
	190	};
	191
	192	static void gpio_mockup_debugfs_setup(struct device *dev,
	193	struct gpio_mockup_chip *chip)
	194	{
	195	struct gpio_mockup_dbgfs_private *priv;
ca8792af	196	struct dentry evfile, link;
9202ba23	197	struct gpio_chip *gc;
ca8792af	198	const char *devname;
9202ba23 BG	199	char *name;
	200	int i;
	201
	202	gc = &chip->gc;
ca8792af	203	devname = dev_name(&gc->gpiodev->dev);
9202ba23	204
ca8792af	205	chip->dbg_dir = debugfs_create_dir(devname, gpio_mockup_dbg_dir);
46526c15	206	if (IS_ERR_OR_NULL(chip->dbg_dir))
9202ba23 BG	207	goto err;
9202ba23 BG	208
ca8792af	209	link = debugfs_create_symlink(gc->label, gpio_mockup_dbg_dir, devname);
46526c15	210	if (IS_ERR_OR_NULL(link))
ca8792af BG	211	goto err;
ca8792af BG	212
9202ba23 BG	213	for (i = 0; i < gc->ngpio; i++) {
	214	name = devm_kasprintf(dev, GFP_KERNEL, "%d", i);
	215	if (!name)
	216	goto err;
	217
	218	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	219	if (!priv)
	220	goto err;
	221
	222	priv->chip = chip;
	223	priv->offset = i;
	224	priv->desc = &gc->gpiodev->descs[i];
	225
	226	evfile = debugfs_create_file(name, 0200, chip->dbg_dir, priv,
	227	&gpio_mockup_event_ops);
46526c15	228	if (IS_ERR_OR_NULL(evfile))
9202ba23 BG	229	goto err;
	230	}
	231
	232	return;
	233
	234	err:
46526c15	235	dev_err(dev, "error creating debugfs event files\n");
9202ba23 BG	236	}
9202ba23 BG	237
1cea4734 BG	238	static int gpio_mockup_name_lines(struct device *dev,
	239	struct gpio_mockup_chip *chip)
	240	{
	241	struct gpio_chip *gc = &chip->gc;
	242	char **names;
	243	int i;
	244
	245	names = devm_kcalloc(dev, gc->ngpio, sizeof(char *), GFP_KERNEL);
	246	if (!names)
	247	return -ENOMEM;
	248
	249	for (i = 0; i < gc->ngpio; i++) {
	250	names[i] = devm_kasprintf(dev, GFP_KERNEL,
	251	"%s-%d", gc->label, i);
	252	if (!names[i])
	253	return -ENOMEM;
	254	}
	255
	256	gc->names = (const char const )names;
	257
	258	return 0;
	259	}
	260
6d974d32	261	static int gpio_mockup_probe(struct platform_device *pdev)
0f98dd1b	262	{
6d974d32 BG	263	struct gpio_mockup_platform_data *pdata;
	264	struct gpio_mockup_chip *chip;
	265	struct gpio_chip *gc;
	266	int rv, base, ngpio;
	267	struct device *dev;
	268	char *name;
	269
	270	dev = &pdev->dev;
	271	pdata = dev_get_platdata(dev);
	272	base = pdata->base;
	273	ngpio = pdata->ngpio;
	274
	275	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
	276	if (!chip)
	277	return -ENOMEM;
	278
	279	name = devm_kasprintf(dev, GFP_KERNEL, "%s-%c",
	280	pdev->name, pdata->index);
	281	if (!name)
	282	return -ENOMEM;
0f98dd1b	283
6d974d32	284	gc = &chip->gc;
ca409160 BG	285	gc->base = base;
	286	gc->ngpio = ngpio;
	287	gc->label = name;
	288	gc->owner = THIS_MODULE;
	289	gc->parent = dev;
	290	gc->get = gpio_mockup_get;
	291	gc->set = gpio_mockup_set;
c47bee95	292	gc->set_multiple = gpio_mockup_set_multiple;
ca409160 BG	293	gc->direction_output = gpio_mockup_dirout;
	294	gc->direction_input = gpio_mockup_dirin;
	295	gc->get_direction = gpio_mockup_get_direction;
e2ff7408	296	gc->to_irq = gpio_mockup_to_irq;
ca409160	297
f6ac438e BG	298	chip->lines = devm_kcalloc(dev, gc->ngpio,
f6ac438e BG	299	sizeof(*chip->lines), GFP_KERNEL);
e4ba07bf BG	300	if (!chip->lines)
e4ba07bf BG	301	return -ENOMEM;
ca409160	302
c3196a78	303	if (pdata->named_lines) {
6d974d32 BG	304	rv = gpio_mockup_name_lines(dev, chip);
	305	if (rv)
	306	return rv;
8a68ea00 BG	307	}
8a68ea00 BG	308
6d974d32	309	rv = devm_irq_sim_init(dev, &chip->irqsim, gc->ngpio);
1e0dca67	310	if (rv < 0)
6d974d32	311	return rv;
e2ff7408	312
6d974d32 BG	313	rv = devm_gpiochip_add_data(dev, &chip->gc, chip);
	314	if (rv)
	315	return rv;
9202ba23 BG	316
	317	if (gpio_mockup_dbg_dir)
	318	gpio_mockup_debugfs_setup(dev, chip);
	319
	320	return 0;
0f98dd1b BJZ	321	}
0f98dd1b BJZ	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	};
0f98dd1b BJZ	329
8a39f597 BG	330	static struct platform_device *gpio_mockup_pdevs[GPIO_MOCKUP_MAX_GC];
	331
	332	static void gpio_mockup_unregister_pdevs(void)
	333	{
	334	struct platform_device *pdev;
	335	int i;
	336
	337	for (i = 0; i < GPIO_MOCKUP_MAX_GC; i++) {
	338	pdev = gpio_mockup_pdevs[i];
	339
	340	if (pdev)
	341	platform_device_unregister(pdev);
	342	}
	343	}
f3b47170 BG	344
f3b47170 BG	345	static int __init gpio_mockup_init(void)
0f98dd1b	346	{
8a39f597 BG	347	int i, num_chips, err = 0, index = 'A';
	348	struct gpio_mockup_platform_data pdata;
	349	struct platform_device *pdev;
0f98dd1b	350
e63a006f BG	351	if ((gpio_mockup_num_ranges < 2) \|\|
	352	(gpio_mockup_num_ranges % 2) \|\|
	353	(gpio_mockup_num_ranges > GPIO_MOCKUP_MAX_RANGES))
20c35ac4 BG	354	return -EINVAL;
20c35ac4 BG	355
8a39f597	356	/* Each chip is described by two values. */
e63a006f	357	num_chips = gpio_mockup_num_ranges / 2;
8a39f597	358
fa86963a BG	359	/*
	360	* The second value in the <base GPIO - number of GPIOS> pair must
	361	* always be greater than 0.
	362	*/
	363	for (i = 0; i < num_chips; i++) {
cd9835f1	364	if (gpio_mockup_range_ngpio(i) < 0)
fa86963a BG	365	return -EINVAL;
	366	}
	367
9202ba23	368	gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup-event", NULL);
46526c15	369	if (IS_ERR_OR_NULL(gpio_mockup_dbg_dir))
f1bec99a	370	gpio_mockup_err("error creating debugfs directory\n");
9202ba23	371
8a39f597	372	err = platform_driver_register(&gpio_mockup_driver);
0f98dd1b	373	if (err) {
f1bec99a	374	gpio_mockup_err("error registering platform driver\n");
0f98dd1b BJZ	375	return err;
	376	}
	377
8a39f597 BG	378	for (i = 0; i < num_chips; i++) {
8a39f597 BG	379	pdata.index = index++;
cd9835f1	380	pdata.base = gpio_mockup_range_base(i);
8a39f597	381	pdata.ngpio = pdata.base < 0
cd9835f1 BG	382	? gpio_mockup_range_ngpio(i)
cd9835f1 BG	383	: gpio_mockup_range_ngpio(i) - pdata.base;
c3196a78	384	pdata.named_lines = gpio_mockup_named_lines;
8a39f597 BG	385
	386	pdev = platform_device_register_resndata(NULL,
	387	GPIO_MOCKUP_NAME,
	388	i, NULL, 0, &pdata,
	389	sizeof(pdata));
c4b54e13	390	if (IS_ERR(pdev)) {
f1bec99a	391	gpio_mockup_err("error registering device");
8a39f597 BG	392	platform_driver_unregister(&gpio_mockup_driver);
8a39f597 BG	393	gpio_mockup_unregister_pdevs();
c4b54e13	394	return PTR_ERR(pdev);
8a39f597 BG	395	}
	396
	397	gpio_mockup_pdevs[i] = pdev;
0f98dd1b BJZ	398	}
	399
	400	return 0;
	401	}
	402
f3b47170	403	static void __exit gpio_mockup_exit(void)
0f98dd1b	404	{
9202ba23	405	debugfs_remove_recursive(gpio_mockup_dbg_dir);
ca409160	406	platform_driver_unregister(&gpio_mockup_driver);
8a39f597	407	gpio_mockup_unregister_pdevs();
0f98dd1b BJZ	408	}
0f98dd1b BJZ	409
f3b47170 BG	410	module_init(gpio_mockup_init);
f3b47170 BG	411	module_exit(gpio_mockup_exit);
0f98dd1b BJZ	412
	413	MODULE_AUTHOR("Kamlakant Patel <[email protected]>");
	414	MODULE_AUTHOR("Bamvor Jian Zhang <[email protected]>");
c60c7f4c	415	MODULE_AUTHOR("Bartosz Golaszewski <[email protected]>");
0f98dd1b BJZ	416	MODULE_DESCRIPTION("GPIO Testing driver");
0f98dd1b BJZ	417	MODULE_LICENSE("GPL v2");