[mirror_ubuntu-focal-kernel.git] / drivers / video / backlight / lcd.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * LCD Lowlevel Control Abstraction
 *
 * Copyright (C) 2003,2004 Hewlett-Packard Company
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/lcd.h>
#include <linux/notifier.h>
#include <linux/ctype.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/slab.h>

#if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \
			   defined(CONFIG_LCD_CLASS_DEVICE_MODULE))
/* This callback gets called when something important happens inside a
 * framebuffer driver. We're looking if that important event is blanking,
 * and if it is, we're switching lcd power as well ...
 */
static int fb_notifier_callback(struct notifier_block *self,
				 unsigned long event, void *data)
{
	struct lcd_device *ld;
	struct fb_event *evdata = data;

	ld = container_of(self, struct lcd_device, fb_notif);
	if (!ld->ops)
		return 0;

	mutex_lock(&ld->ops_lock);
	if (!ld->ops->check_fb || ld->ops->check_fb(ld, evdata->info)) {
		if (event == FB_EVENT_BLANK) {
			if (ld->ops->set_power)
				ld->ops->set_power(ld, *(int *)evdata->data);
		} else {
			if (ld->ops->set_mode)
				ld->ops->set_mode(ld, evdata->data);
		}
	}
	mutex_unlock(&ld->ops_lock);
	return 0;
}

static int lcd_register_fb(struct lcd_device *ld)
{
	memset(&ld->fb_notif, 0, sizeof(ld->fb_notif));
	ld->fb_notif.notifier_call = fb_notifier_callback;
	return fb_register_client(&ld->fb_notif);
}

static void lcd_unregister_fb(struct lcd_device *ld)
{
	fb_unregister_client(&ld->fb_notif);
}
#else
static int lcd_register_fb(struct lcd_device *ld)
{
	return 0;
}

static inline void lcd_unregister_fb(struct lcd_device *ld)
{
}
#endif /* CONFIG_FB */

static ssize_t lcd_power_show(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	int rc;
	struct lcd_device *ld = to_lcd_device(dev);

	mutex_lock(&ld->ops_lock);
	if (ld->ops && ld->ops->get_power)
		rc = sprintf(buf, "%d\n", ld->ops->get_power(ld));
	else
		rc = -ENXIO;
	mutex_unlock(&ld->ops_lock);

	return rc;
}

static ssize_t lcd_power_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	int rc;
	struct lcd_device *ld = to_lcd_device(dev);
	unsigned long power;

	rc = kstrtoul(buf, 0, &power);
	if (rc)
		return rc;

	rc = -ENXIO;

	mutex_lock(&ld->ops_lock);
	if (ld->ops && ld->ops->set_power) {
		pr_debug("set power to %lu\n", power);
		ld->ops->set_power(ld, power);
		rc = count;
	}
	mutex_unlock(&ld->ops_lock);

	return rc;
}
static DEVICE_ATTR_RW(lcd_power);

static ssize_t contrast_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	int rc = -ENXIO;
	struct lcd_device *ld = to_lcd_device(dev);

	mutex_lock(&ld->ops_lock);
	if (ld->ops && ld->ops->get_contrast)
		rc = sprintf(buf, "%d\n", ld->ops->get_contrast(ld));
	mutex_unlock(&ld->ops_lock);

	return rc;
}

static ssize_t contrast_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	int rc;
	struct lcd_device *ld = to_lcd_device(dev);
	unsigned long contrast;

	rc = kstrtoul(buf, 0, &contrast);
	if (rc)
		return rc;

	rc = -ENXIO;

	mutex_lock(&ld->ops_lock);
	if (ld->ops && ld->ops->set_contrast) {
		pr_debug("set contrast to %lu\n", contrast);
		ld->ops->set_contrast(ld, contrast);
		rc = count;
	}
	mutex_unlock(&ld->ops_lock);

	return rc;
}
static DEVICE_ATTR_RW(contrast);

static ssize_t max_contrast_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct lcd_device *ld = to_lcd_device(dev);

	return sprintf(buf, "%d\n", ld->props.max_contrast);
}
static DEVICE_ATTR_RO(max_contrast);

static struct class *lcd_class;

static void lcd_device_release(struct device *dev)
{
	struct lcd_device *ld = to_lcd_device(dev);
	kfree(ld);
}

static struct attribute *lcd_device_attrs[] = {
	&dev_attr_lcd_power.attr,
	&dev_attr_contrast.attr,
	&dev_attr_max_contrast.attr,
	NULL,
};
ATTRIBUTE_GROUPS(lcd_device);

/**
 * lcd_device_register - register a new object of lcd_device class.
 * @name: the name of the new object(must be the same as the name of the
 *   respective framebuffer device).
 * @devdata: an optional pointer to be stored in the device. The
 *   methods may retrieve it by using lcd_get_data(ld).
 * @ops: the lcd operations structure.
 *
 * Creates and registers a new lcd device. Returns either an ERR_PTR()
 * or a pointer to the newly allocated device.
 */
struct lcd_device *lcd_device_register(const char *name, struct device *parent,
		void *devdata, struct lcd_ops *ops)
{
	struct lcd_device *new_ld;
	int rc;

	pr_debug("lcd_device_register: name=%s\n", name);

	new_ld = kzalloc(sizeof(struct lcd_device), GFP_KERNEL);
	if (!new_ld)
		return ERR_PTR(-ENOMEM);

	mutex_init(&new_ld->ops_lock);
	mutex_init(&new_ld->update_lock);

	new_ld->dev.class = lcd_class;
	new_ld->dev.parent = parent;
	new_ld->dev.release = lcd_device_release;
	dev_set_name(&new_ld->dev, "%s", name);
	dev_set_drvdata(&new_ld->dev, devdata);

	new_ld->ops = ops;

	rc = device_register(&new_ld->dev);
	if (rc) {
		put_device(&new_ld->dev);
		return ERR_PTR(rc);
	}

	rc = lcd_register_fb(new_ld);
	if (rc) {
		device_unregister(&new_ld->dev);
		return ERR_PTR(rc);
	}

	return new_ld;
}
EXPORT_SYMBOL(lcd_device_register);

/**
 * lcd_device_unregister - unregisters a object of lcd_device class.
 * @ld: the lcd device object to be unregistered and freed.
 *
 * Unregisters a previously registered via lcd_device_register object.
 */
void lcd_device_unregister(struct lcd_device *ld)
{
	if (!ld)
		return;

	mutex_lock(&ld->ops_lock);
	ld->ops = NULL;
	mutex_unlock(&ld->ops_lock);
	lcd_unregister_fb(ld);

	device_unregister(&ld->dev);
}
EXPORT_SYMBOL(lcd_device_unregister);

static void devm_lcd_device_release(struct device *dev, void *res)
{
	struct lcd_device *lcd = *(struct lcd_device **)res;

	lcd_device_unregister(lcd);
}

static int devm_lcd_device_match(struct device *dev, void *res, void *data)
{
	struct lcd_device **r = res;

	return *r == data;
}

/**
 * devm_lcd_device_register - resource managed lcd_device_register()
 * @dev: the device to register
 * @name: the name of the device
 * @parent: a pointer to the parent device
 * @devdata: an optional pointer to be stored for private driver use
 * @ops: the lcd operations structure
 *
 * @return a struct lcd on success, or an ERR_PTR on error
 *
 * Managed lcd_device_register(). The lcd_device returned from this function
 * are automatically freed on driver detach. See lcd_device_register()
 * for more information.
 */
struct lcd_device *devm_lcd_device_register(struct device *dev,
		const char *name, struct device *parent,
		void *devdata, struct lcd_ops *ops)
{
	struct lcd_device **ptr, *lcd;

	ptr = devres_alloc(devm_lcd_device_release, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
		return ERR_PTR(-ENOMEM);

	lcd = lcd_device_register(name, parent, devdata, ops);
	if (!IS_ERR(lcd)) {
		*ptr = lcd;
		devres_add(dev, ptr);
	} else {
		devres_free(ptr);
	}

	return lcd;
}
EXPORT_SYMBOL(devm_lcd_device_register);

/**
 * devm_lcd_device_unregister - resource managed lcd_device_unregister()
 * @dev: the device to unregister
 * @ld: the lcd device to unregister
 *
 * Deallocated a lcd allocated with devm_lcd_device_register(). Normally
 * this function will not need to be called and the resource management
 * code will ensure that the resource is freed.
 */
void devm_lcd_device_unregister(struct device *dev, struct lcd_device *ld)
{
	int rc;

	rc = devres_release(dev, devm_lcd_device_release,
				devm_lcd_device_match, ld);
	WARN_ON(rc);
}
EXPORT_SYMBOL(devm_lcd_device_unregister);


static void __exit lcd_class_exit(void)
{
	class_destroy(lcd_class);
}

static int __init lcd_class_init(void)
{
	lcd_class = class_create(THIS_MODULE, "lcd");
	if (IS_ERR(lcd_class)) {
		pr_warn("Unable to create backlight class; errno = %ld\n",
			PTR_ERR(lcd_class));
		return PTR_ERR(lcd_class);
	}

	lcd_class->dev_groups = lcd_device_groups;
	return 0;
}

/*
 * if this is compiled into the kernel, we need to ensure that the
 * class is registered before users of the class try to register lcd's
 */
postcore_initcall(lcd_class_init);
module_exit(lcd_class_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jamey Hicks <jamey.hicks@hp.com>, Andrew Zabolotny <zap@homelink.ru>");
MODULE_DESCRIPTION("LCD Lowlevel Control Abstraction");
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/*
	3	* LCD Lowlevel Control Abstraction
	4	*
	5	* Copyright (C) 2003,2004 Hewlett-Packard Company
	6	*
	7	*/
	8
35f96162 JH	9	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
35f96162 JH	10
1da177e4 LT	11	#include <linux/module.h>
	12	#include <linux/init.h>
	13	#include <linux/device.h>
	14	#include <linux/lcd.h>
	15	#include <linux/notifier.h>
	16	#include <linux/ctype.h>
	17	#include <linux/err.h>
	18	#include <linux/fb.h>
5a0e3ad6	19	#include <linux/slab.h>
1da177e4	20
3d5eeadd JS	21	#if defined(CONFIG_FB) \|\| (defined(CONFIG_FB_MODULE) && \
	22	defined(CONFIG_LCD_CLASS_DEVICE_MODULE))
	23	/* This callback gets called when something important happens inside a
	24	* framebuffer driver. We're looking if that important event is blanking,
	25	* and if it is, we're switching lcd power as well ...
	26	*/
	27	static int fb_notifier_callback(struct notifier_block *self,
	28	unsigned long event, void *data)
	29	{
	30	struct lcd_device *ld;
	31	struct fb_event *evdata = data;
	32
3d5eeadd	33	ld = container_of(self, struct lcd_device, fb_notif);
faa312da EM	34	if (!ld->ops)
	35	return 0;
	36
599a52d1	37	mutex_lock(&ld->ops_lock);
faa312da	38	if (!ld->ops->check_fb \|\| ld->ops->check_fb(ld, evdata->info)) {
b3b4dc88 BD	39	if (event == FB_EVENT_BLANK) {
	40	if (ld->ops->set_power)
	41	ld->ops->set_power(ld, (int )evdata->data);
	42	} else {
	43	if (ld->ops->set_mode)
	44	ld->ops->set_mode(ld, evdata->data);
	45	}
faa312da	46	}
599a52d1	47	mutex_unlock(&ld->ops_lock);
3d5eeadd JS	48	return 0;
	49	}
	50
	51	static int lcd_register_fb(struct lcd_device *ld)
	52	{
1e0fa6bd	53	memset(&ld->fb_notif, 0, sizeof(ld->fb_notif));
3d5eeadd JS	54	ld->fb_notif.notifier_call = fb_notifier_callback;
	55	return fb_register_client(&ld->fb_notif);
	56	}
	57
	58	static void lcd_unregister_fb(struct lcd_device *ld)
	59	{
	60	fb_unregister_client(&ld->fb_notif);
	61	}
	62	#else
	63	static int lcd_register_fb(struct lcd_device *ld)
	64	{
	65	return 0;
	66	}
	67
	68	static inline void lcd_unregister_fb(struct lcd_device *ld)
	69	{
	70	}
	71	#endif /* CONFIG_FB */
	72
d79fd03f	73	static ssize_t lcd_power_show(struct device dev, struct device_attribute attr,
655bfd7a	74	char *buf)
1da177e4 LT	75	{
1da177e4 LT	76	int rc;
655bfd7a	77	struct lcd_device *ld = to_lcd_device(dev);
1da177e4	78
599a52d1 RP	79	mutex_lock(&ld->ops_lock);
	80	if (ld->ops && ld->ops->get_power)
	81	rc = sprintf(buf, "%d\n", ld->ops->get_power(ld));
1da177e4 LT	82	else
1da177e4 LT	83	rc = -ENXIO;
599a52d1	84	mutex_unlock(&ld->ops_lock);
1da177e4 LT	85
	86	return rc;
	87	}
	88
d79fd03f	89	static ssize_t lcd_power_store(struct device *dev,
655bfd7a	90	struct device_attribute attr, const char buf, size_t count)
1da177e4	91	{
424e06e3	92	int rc;
655bfd7a	93	struct lcd_device *ld = to_lcd_device(dev);
66655760	94	unsigned long power;
1da177e4	95
66655760 JH	96	rc = kstrtoul(buf, 0, &power);
	97	if (rc)
	98	return rc;
1da177e4	99
424e06e3 JH	100	rc = -ENXIO;
424e06e3 JH	101
599a52d1 RP	102	mutex_lock(&ld->ops_lock);
599a52d1 RP	103	if (ld->ops && ld->ops->set_power) {
35f96162	104	pr_debug("set power to %lu\n", power);
599a52d1	105	ld->ops->set_power(ld, power);
1da177e4	106	rc = count;
68673afd	107	}
599a52d1	108	mutex_unlock(&ld->ops_lock);
1da177e4 LT	109
	110	return rc;
	111	}
d79fd03f	112	static DEVICE_ATTR_RW(lcd_power);
1da177e4	113
d79fd03f	114	static ssize_t contrast_show(struct device *dev,
655bfd7a	115	struct device_attribute attr, char buf)
1da177e4	116	{
68673afd	117	int rc = -ENXIO;
655bfd7a	118	struct lcd_device *ld = to_lcd_device(dev);
1da177e4	119
599a52d1 RP	120	mutex_lock(&ld->ops_lock);
	121	if (ld->ops && ld->ops->get_contrast)
	122	rc = sprintf(buf, "%d\n", ld->ops->get_contrast(ld));
	123	mutex_unlock(&ld->ops_lock);
1da177e4 LT	124
	125	return rc;
	126	}
	127
d79fd03f	128	static ssize_t contrast_store(struct device *dev,
655bfd7a	129	struct device_attribute attr, const char buf, size_t count)
1da177e4	130	{
424e06e3	131	int rc;
655bfd7a	132	struct lcd_device *ld = to_lcd_device(dev);
66655760	133	unsigned long contrast;
1da177e4	134
66655760 JH	135	rc = kstrtoul(buf, 0, &contrast);
	136	if (rc)
	137	return rc;
1da177e4	138
424e06e3 JH	139	rc = -ENXIO;
424e06e3 JH	140
599a52d1 RP	141	mutex_lock(&ld->ops_lock);
599a52d1 RP	142	if (ld->ops && ld->ops->set_contrast) {
35f96162	143	pr_debug("set contrast to %lu\n", contrast);
599a52d1	144	ld->ops->set_contrast(ld, contrast);
1da177e4	145	rc = count;
68673afd	146	}
599a52d1	147	mutex_unlock(&ld->ops_lock);
1da177e4 LT	148
	149	return rc;
	150	}
d79fd03f	151	static DEVICE_ATTR_RW(contrast);
1da177e4	152
d79fd03f	153	static ssize_t max_contrast_show(struct device *dev,
655bfd7a	154	struct device_attribute attr, char buf)
1da177e4	155	{
655bfd7a	156	struct lcd_device *ld = to_lcd_device(dev);
1da177e4	157
599a52d1	158	return sprintf(buf, "%d\n", ld->props.max_contrast);
1da177e4	159	}
d79fd03f	160	static DEVICE_ATTR_RO(max_contrast);
1da177e4	161
0ad90efd	162	static struct class *lcd_class;
655bfd7a RP	163
655bfd7a RP	164	static void lcd_device_release(struct device *dev)
1da177e4 LT	165	{
	166	struct lcd_device *ld = to_lcd_device(dev);
	167	kfree(ld);
	168	}
	169
d79fd03f GKH	170	static struct attribute *lcd_device_attrs[] = {
	171	&dev_attr_lcd_power.attr,
	172	&dev_attr_contrast.attr,
	173	&dev_attr_max_contrast.attr,
	174	NULL,
1da177e4	175	};
d79fd03f	176	ATTRIBUTE_GROUPS(lcd_device);
1da177e4	177
1da177e4 LT	178	/**
	179	* lcd_device_register - register a new object of lcd_device class.
	180	* @name: the name of the new object(must be the same as the name of the
	181	* respective framebuffer device).
655bfd7a RP	182	* @devdata: an optional pointer to be stored in the device. The
655bfd7a RP	183	* methods may retrieve it by using lcd_get_data(ld).
599a52d1	184	* @ops: the lcd operations structure.
1da177e4	185	*
655bfd7a	186	* Creates and registers a new lcd device. Returns either an ERR_PTR()
1da177e4 LT	187	* or a pointer to the newly allocated device.
1da177e4 LT	188	*/
655bfd7a RP	189	struct lcd_device lcd_device_register(const char name, struct device *parent,
655bfd7a RP	190	void devdata, struct lcd_ops ops)
1da177e4	191	{
1da177e4	192	struct lcd_device *new_ld;
655bfd7a	193	int rc;
1da177e4 LT	194
	195	pr_debug("lcd_device_register: name=%s\n", name);
	196
599a52d1	197	new_ld = kzalloc(sizeof(struct lcd_device), GFP_KERNEL);
90968e8e	198	if (!new_ld)
10ad1b73	199	return ERR_PTR(-ENOMEM);
1da177e4	200
599a52d1	201	mutex_init(&new_ld->ops_lock);
28ee086d	202	mutex_init(&new_ld->update_lock);
1da177e4	203
655bfd7a RP	204	new_ld->dev.class = lcd_class;
	205	new_ld->dev.parent = parent;
	206	new_ld->dev.release = lcd_device_release;
02aa2a37	207	dev_set_name(&new_ld->dev, "%s", name);
655bfd7a RP	208	dev_set_drvdata(&new_ld->dev, devdata);
655bfd7a RP	209
cc21942b UKK	210	new_ld->ops = ops;
cc21942b UKK	211
655bfd7a	212	rc = device_register(&new_ld->dev);
90968e8e	213	if (rc) {
54f5968d	214	put_device(&new_ld->dev);
1da177e4 LT	215	return ERR_PTR(rc);
	216	}
	217
3d5eeadd	218	rc = lcd_register_fb(new_ld);
2fd5a154	219	if (rc) {
655bfd7a	220	device_unregister(&new_ld->dev);
2fd5a154 DT	221	return ERR_PTR(rc);
2fd5a154 DT	222	}
1da177e4	223
1da177e4 LT	224	return new_ld;
	225	}
	226	EXPORT_SYMBOL(lcd_device_register);
	227
	228	/**
	229	* lcd_device_unregister - unregisters a object of lcd_device class.
	230	* @ld: the lcd device object to be unregistered and freed.
	231	*
	232	* Unregisters a previously registered via lcd_device_register object.
	233	*/
	234	void lcd_device_unregister(struct lcd_device *ld)
	235	{
1da177e4 LT	236	if (!ld)
	237	return;
	238
599a52d1 RP	239	mutex_lock(&ld->ops_lock);
	240	ld->ops = NULL;
	241	mutex_unlock(&ld->ops_lock);
3d5eeadd	242	lcd_unregister_fb(ld);
655bfd7a RP	243
655bfd7a RP	244	device_unregister(&ld->dev);
1da177e4 LT	245	}
	246	EXPORT_SYMBOL(lcd_device_unregister);
	247
1d0c48e6 JH	248	static void devm_lcd_device_release(struct device dev, void res)
	249	{
	250	struct lcd_device lcd = (struct lcd_device **)res;
	251
	252	lcd_device_unregister(lcd);
	253	}
	254
	255	static int devm_lcd_device_match(struct device dev, void res, void *data)
	256	{
	257	struct lcd_device **r = res;
	258
	259	return *r == data;
	260	}
	261
	262	/**
	263	* devm_lcd_device_register - resource managed lcd_device_register()
	264	* @dev: the device to register
	265	* @name: the name of the device
	266	* @parent: a pointer to the parent device
	267	* @devdata: an optional pointer to be stored for private driver use
	268	* @ops: the lcd operations structure
	269	*
	270	* @return a struct lcd on success, or an ERR_PTR on error
	271	*
	272	* Managed lcd_device_register(). The lcd_device returned from this function
	273	* are automatically freed on driver detach. See lcd_device_register()
	274	* for more information.
	275	*/
	276	struct lcd_device devm_lcd_device_register(struct device dev,
	277	const char name, struct device parent,
	278	void devdata, struct lcd_ops ops)
	279	{
	280	struct lcd_device *ptr, lcd;
	281
	282	ptr = devres_alloc(devm_lcd_device_release, sizeof(*ptr), GFP_KERNEL);
	283	if (!ptr)
	284	return ERR_PTR(-ENOMEM);
	285
	286	lcd = lcd_device_register(name, parent, devdata, ops);
	287	if (!IS_ERR(lcd)) {
	288	*ptr = lcd;
	289	devres_add(dev, ptr);
	290	} else {
	291	devres_free(ptr);
	292	}
	293
	294	return lcd;
	295	}
	296	EXPORT_SYMBOL(devm_lcd_device_register);
	297
	298	/**
	299	* devm_lcd_device_unregister - resource managed lcd_device_unregister()
	300	* @dev: the device to unregister
	301	* @ld: the lcd device to unregister
	302	*
	303	* Deallocated a lcd allocated with devm_lcd_device_register(). Normally
	304	* this function will not need to be called and the resource management
	305	* code will ensure that the resource is freed.
	306	*/
	307	void devm_lcd_device_unregister(struct device dev, struct lcd_device ld)
	308	{
	309	int rc;
	310
	311	rc = devres_release(dev, devm_lcd_device_release,
312	devm_lcd_device_match, ld);
313	WARN_ON(rc);
314	}
315	EXPORT_SYMBOL(devm_lcd_device_unregister);
316
317
1da177e4 LT	318	static void __exit lcd_class_exit(void)
1da177e4 LT	319	{
655bfd7a	320	class_destroy(lcd_class);
1da177e4 LT	321	}
	322
	323	static int __init lcd_class_init(void)
	324	{
655bfd7a RP	325	lcd_class = class_create(THIS_MODULE, "lcd");
655bfd7a RP	326	if (IS_ERR(lcd_class)) {
35f96162 JH	327	pr_warn("Unable to create backlight class; errno = %ld\n",
35f96162 JH	328	PTR_ERR(lcd_class));
655bfd7a RP	329	return PTR_ERR(lcd_class);
	330	}
	331
d79fd03f	332	lcd_class->dev_groups = lcd_device_groups;
655bfd7a	333	return 0;
1da177e4 LT	334	}
	335
	336	/*
	337	* if this is compiled into the kernel, we need to ensure that the
	338	* class is registered before users of the class try to register lcd's
	339	*/
	340	postcore_initcall(lcd_class_init);
	341	module_exit(lcd_class_exit);
	342
	343	MODULE_LICENSE("GPL");
	344	MODULE_AUTHOR("Jamey Hicks <jamey.hicks@hp.com>, Andrew Zabolotny <zap@homelink.ru>");
	345	MODULE_DESCRIPTION("LCD Lowlevel Control Abstraction");