[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / cpuidle / sysfs.c

/*
 * sysfs.c - sysfs support
 *
 * (C) 2006-2007 Shaohua Li <shaohua.li@intel.com>
 *
 * This code is licenced under the GPL.
 */

#include <linux/kernel.h>
#include <linux/cpuidle.h>
#include <linux/sysfs.h>
#include <linux/cpu.h>

#include "cpuidle.h"

static unsigned int sysfs_switch;
static int __init cpuidle_sysfs_setup(char *unused)
{
	sysfs_switch = 1;
	return 1;
}
__setup("cpuidle_sysfs_switch", cpuidle_sysfs_setup);

static ssize_t show_available_governors(struct sysdev_class *class,
					struct sysdev_class_attribute *attr,
					char *buf)
{
	ssize_t i = 0;
	struct cpuidle_governor *tmp;

	mutex_lock(&cpuidle_lock);
	list_for_each_entry(tmp, &cpuidle_governors, governor_list) {
		if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) - CPUIDLE_NAME_LEN - 2))
			goto out;
		i += scnprintf(&buf[i], CPUIDLE_NAME_LEN, "%s ", tmp->name);
	}

out:
	i+= sprintf(&buf[i], "\n");
	mutex_unlock(&cpuidle_lock);
	return i;
}

static ssize_t show_current_driver(struct sysdev_class *class,
				   struct sysdev_class_attribute *attr,
				   char *buf)
{
	ssize_t ret;

	spin_lock(&cpuidle_driver_lock);
	if (cpuidle_curr_driver)
		ret = sprintf(buf, "%s\n", cpuidle_curr_driver->name);
	else
		ret = sprintf(buf, "none\n");
	spin_unlock(&cpuidle_driver_lock);

	return ret;
}

static ssize_t show_current_governor(struct sysdev_class *class,
				     struct sysdev_class_attribute *attr,
				     char *buf)
{
	ssize_t ret;

	mutex_lock(&cpuidle_lock);
	if (cpuidle_curr_governor)
		ret = sprintf(buf, "%s\n", cpuidle_curr_governor->name);
	else
		ret = sprintf(buf, "none\n");
	mutex_unlock(&cpuidle_lock);

	return ret;
}

static ssize_t store_current_governor(struct sysdev_class *class,
				      struct sysdev_class_attribute *attr,
				      const char *buf, size_t count)
{
	char gov_name[CPUIDLE_NAME_LEN];
	int ret = -EINVAL;
	size_t len = count;
	struct cpuidle_governor *gov;

	if (!len || len >= sizeof(gov_name))
		return -EINVAL;

	memcpy(gov_name, buf, len);
	gov_name[len] = '\0';
	if (gov_name[len - 1] == '\n')
		gov_name[--len] = '\0';

	mutex_lock(&cpuidle_lock);

	list_for_each_entry(gov, &cpuidle_governors, governor_list) {
		if (strlen(gov->name) == len && !strcmp(gov->name, gov_name)) {
			ret = cpuidle_switch_governor(gov);
			break;
		}
	}

	mutex_unlock(&cpuidle_lock);

	if (ret)
		return ret;
	else
		return count;
}

static SYSDEV_CLASS_ATTR(current_driver, 0444, show_current_driver, NULL);
static SYSDEV_CLASS_ATTR(current_governor_ro, 0444, show_current_governor,
			 NULL);

static struct attribute *cpuclass_default_attrs[] = {
	&attr_current_driver.attr,
	&attr_current_governor_ro.attr,
	NULL
};

static SYSDEV_CLASS_ATTR(available_governors, 0444, show_available_governors,
			 NULL);
static SYSDEV_CLASS_ATTR(current_governor, 0644, show_current_governor,
			 store_current_governor);

static struct attribute *cpuclass_switch_attrs[] = {
	&attr_available_governors.attr,
	&attr_current_driver.attr,
	&attr_current_governor.attr,
	NULL
};

static struct attribute_group cpuclass_attr_group = {
	.attrs = cpuclass_default_attrs,
	.name = "cpuidle",
};

/**
 * cpuidle_add_class_sysfs - add CPU global sysfs attributes
 */
int cpuidle_add_class_sysfs(struct sysdev_class *cls)
{
	if (sysfs_switch)
		cpuclass_attr_group.attrs = cpuclass_switch_attrs;

	return sysfs_create_group(&cls->kset.kobj, &cpuclass_attr_group);
}

/**
 * cpuidle_remove_class_sysfs - remove CPU global sysfs attributes
 */
void cpuidle_remove_class_sysfs(struct sysdev_class *cls)
{
	sysfs_remove_group(&cls->kset.kobj, &cpuclass_attr_group);
}

struct cpuidle_attr {
	struct attribute attr;
	ssize_t (*show)(struct cpuidle_device *, char *);
	ssize_t (*store)(struct cpuidle_device *, const char *, size_t count);
};

#define define_one_ro(_name, show) \
	static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
#define define_one_rw(_name, show, store) \
	static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store)

#define kobj_to_cpuidledev(k) container_of(k, struct cpuidle_device, kobj)
#define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr)
static ssize_t cpuidle_show(struct kobject * kobj, struct attribute * attr ,char * buf)
{
	int ret = -EIO;
	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
	struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);

	if (cattr->show) {
		mutex_lock(&cpuidle_lock);
		ret = cattr->show(dev, buf);
		mutex_unlock(&cpuidle_lock);
	}
	return ret;
}

static ssize_t cpuidle_store(struct kobject * kobj, struct attribute * attr,
		     const char * buf, size_t count)
{
	int ret = -EIO;
	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
	struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);

	if (cattr->store) {
		mutex_lock(&cpuidle_lock);
		ret = cattr->store(dev, buf, count);
		mutex_unlock(&cpuidle_lock);
	}
	return ret;
}

static const struct sysfs_ops cpuidle_sysfs_ops = {
	.show = cpuidle_show,
	.store = cpuidle_store,
};

static void cpuidle_sysfs_release(struct kobject *kobj)
{
	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);

	complete(&dev->kobj_unregister);
}

static struct kobj_type ktype_cpuidle = {
	.sysfs_ops = &cpuidle_sysfs_ops,
	.release = cpuidle_sysfs_release,
};

struct cpuidle_state_attr {
	struct attribute attr;
	ssize_t (*show)(struct cpuidle_state *, char *);
	ssize_t (*store)(struct cpuidle_state *, const char *, size_t);
};

#define define_one_state_ro(_name, show) \
static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL)

#define define_show_state_function(_name) \
static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \
{ \
	return sprintf(buf, "%u\n", state->_name);\
}

#define define_show_state_ull_function(_name) \
static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \
{ \
	return sprintf(buf, "%llu\n", state->_name);\
}

#define define_show_state_str_function(_name) \
static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \
{ \
	if (state->_name[0] == '\0')\
		return sprintf(buf, "<null>\n");\
	return sprintf(buf, "%s\n", state->_name);\
}

define_show_state_function(exit_latency)
define_show_state_function(power_usage)
define_show_state_ull_function(usage)
define_show_state_ull_function(time)
define_show_state_str_function(name)
define_show_state_str_function(desc)

define_one_state_ro(name, show_state_name);
define_one_state_ro(desc, show_state_desc);
define_one_state_ro(latency, show_state_exit_latency);
define_one_state_ro(power, show_state_power_usage);
define_one_state_ro(usage, show_state_usage);
define_one_state_ro(time, show_state_time);

static struct attribute *cpuidle_state_default_attrs[] = {
	&attr_name.attr,
	&attr_desc.attr,
	&attr_latency.attr,
	&attr_power.attr,
	&attr_usage.attr,
	&attr_time.attr,
	NULL
};

#define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
#define kobj_to_state(k) (kobj_to_state_obj(k)->state)
#define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)
static ssize_t cpuidle_state_show(struct kobject * kobj,
	struct attribute * attr ,char * buf)
{
	int ret = -EIO;
	struct cpuidle_state *state = kobj_to_state(kobj);
	struct cpuidle_state_attr * cattr = attr_to_stateattr(attr);

	if (cattr->show)
		ret = cattr->show(state, buf);

	return ret;
}

static const struct sysfs_ops cpuidle_state_sysfs_ops = {
	.show = cpuidle_state_show,
};

static void cpuidle_state_sysfs_release(struct kobject *kobj)
{
	struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj);

	complete(&state_obj->kobj_unregister);
}

static struct kobj_type ktype_state_cpuidle = {
	.sysfs_ops = &cpuidle_state_sysfs_ops,
	.default_attrs = cpuidle_state_default_attrs,
	.release = cpuidle_state_sysfs_release,
};

static void inline cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
{
	kobject_put(&device->kobjs[i]->kobj);
	wait_for_completion(&device->kobjs[i]->kobj_unregister);
	kfree(device->kobjs[i]);
	device->kobjs[i] = NULL;
}

/**
 * cpuidle_add_driver_sysfs - adds driver-specific sysfs attributes
 * @device: the target device
 */
int cpuidle_add_state_sysfs(struct cpuidle_device *device)
{
	int i, ret = -ENOMEM;
	struct cpuidle_state_kobj *kobj;

	/* state statistics */
	for (i = 0; i < device->state_count; i++) {
		kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
		if (!kobj)
			goto error_state;
		kobj->state = &device->states[i];
		init_completion(&kobj->kobj_unregister);

		ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, &device->kobj,
					   "state%d", i);
		if (ret) {
			kfree(kobj);
			goto error_state;
		}
		kobject_uevent(&kobj->kobj, KOBJ_ADD);
		device->kobjs[i] = kobj;
	}

	return 0;

error_state:
	for (i = i - 1; i >= 0; i--)
		cpuidle_free_state_kobj(device, i);
	return ret;
}

/**
 * cpuidle_remove_driver_sysfs - removes driver-specific sysfs attributes
 * @device: the target device
 */
void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
{
	int i;

	for (i = 0; i < device->state_count; i++)
		cpuidle_free_state_kobj(device, i);
}

/**
 * cpuidle_add_sysfs - creates a sysfs instance for the target device
 * @sysdev: the target device
 */
int cpuidle_add_sysfs(struct sys_device *sysdev)
{
	int cpu = sysdev->id;
	struct cpuidle_device *dev;
	int error;

	dev = per_cpu(cpuidle_devices, cpu);
	error = kobject_init_and_add(&dev->kobj, &ktype_cpuidle, &sysdev->kobj,
				     "cpuidle");
	if (!error)
		kobject_uevent(&dev->kobj, KOBJ_ADD);
	return error;
}

/**
 * cpuidle_remove_sysfs - deletes a sysfs instance on the target device
 * @sysdev: the target device
 */
void cpuidle_remove_sysfs(struct sys_device *sysdev)
{
	int cpu = sysdev->id;
	struct cpuidle_device *dev;

	dev = per_cpu(cpuidle_devices, cpu);
	kobject_put(&dev->kobj);
}
Commit	Line	Data
4f86d3a8 LB	1	/*
	2	* sysfs.c - sysfs support
	3	*
	4	* (C) 2006-2007 Shaohua Li <shaohua.li@intel.com>
	5	*
	6	* This code is licenced under the GPL.
	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/cpuidle.h>
	11	#include <linux/sysfs.h>
	12	#include <linux/cpu.h>
	13
	14	#include "cpuidle.h"
	15
	16	static unsigned int sysfs_switch;
	17	static int __init cpuidle_sysfs_setup(char *unused)
	18	{
	19	sysfs_switch = 1;
	20	return 1;
	21	}
	22	__setup("cpuidle_sysfs_switch", cpuidle_sysfs_setup);
	23
66198f36	24	static ssize_t show_available_governors(struct sysdev_class *class,
c9be0a36	25	struct sysdev_class_attribute *attr,
66198f36	26	char *buf)
4f86d3a8 LB	27	{
	28	ssize_t i = 0;
	29	struct cpuidle_governor *tmp;
	30
	31	mutex_lock(&cpuidle_lock);
	32	list_for_each_entry(tmp, &cpuidle_governors, governor_list) {
	33	if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) - CPUIDLE_NAME_LEN - 2))
	34	goto out;
	35	i += scnprintf(&buf[i], CPUIDLE_NAME_LEN, "%s ", tmp->name);
	36	}
	37
	38	out:
	39	i+= sprintf(&buf[i], "\n");
	40	mutex_unlock(&cpuidle_lock);
	41	return i;
	42	}
	43
66198f36	44	static ssize_t show_current_driver(struct sysdev_class *class,
c9be0a36	45	struct sysdev_class_attribute *attr,
66198f36	46	char *buf)
4f86d3a8 LB	47	{
	48	ssize_t ret;
	49
	50	spin_lock(&cpuidle_driver_lock);
	51	if (cpuidle_curr_driver)
	52	ret = sprintf(buf, "%s\n", cpuidle_curr_driver->name);
	53	else
	54	ret = sprintf(buf, "none\n");
	55	spin_unlock(&cpuidle_driver_lock);
	56
	57	return ret;
	58	}
	59
66198f36	60	static ssize_t show_current_governor(struct sysdev_class *class,
c9be0a36	61	struct sysdev_class_attribute *attr,
66198f36	62	char *buf)
4f86d3a8 LB	63	{
	64	ssize_t ret;
	65
	66	mutex_lock(&cpuidle_lock);
	67	if (cpuidle_curr_governor)
	68	ret = sprintf(buf, "%s\n", cpuidle_curr_governor->name);
	69	else
	70	ret = sprintf(buf, "none\n");
	71	mutex_unlock(&cpuidle_lock);
	72
	73	return ret;
	74	}
	75
66198f36	76	static ssize_t store_current_governor(struct sysdev_class *class,
c9be0a36	77	struct sysdev_class_attribute *attr,
66198f36	78	const char *buf, size_t count)
4f86d3a8 LB	79	{
	80	char gov_name[CPUIDLE_NAME_LEN];
	81	int ret = -EINVAL;
	82	size_t len = count;
	83	struct cpuidle_governor *gov;
	84
	85	if (!len \|\| len >= sizeof(gov_name))
	86	return -EINVAL;
	87
	88	memcpy(gov_name, buf, len);
	89	gov_name[len] = '\0';
	90	if (gov_name[len - 1] == '\n')
	91	gov_name[--len] = '\0';
	92
	93	mutex_lock(&cpuidle_lock);
	94
	95	list_for_each_entry(gov, &cpuidle_governors, governor_list) {
	96	if (strlen(gov->name) == len && !strcmp(gov->name, gov_name)) {
	97	ret = cpuidle_switch_governor(gov);
	98	break;
	99	}
	100	}
	101
	102	mutex_unlock(&cpuidle_lock);
	103
	104	if (ret)
	105	return ret;
	106	else
	107	return count;
	108	}
	109
66198f36 RV	110	static SYSDEV_CLASS_ATTR(current_driver, 0444, show_current_driver, NULL);
	111	static SYSDEV_CLASS_ATTR(current_governor_ro, 0444, show_current_governor,
	112	NULL);
4f86d3a8 LB	113
	114	static struct attribute *cpuclass_default_attrs[] = {
	115	&attr_current_driver.attr,
	116	&attr_current_governor_ro.attr,
	117	NULL
	118	};
	119
66198f36 RV	120	static SYSDEV_CLASS_ATTR(available_governors, 0444, show_available_governors,
	121	NULL);
	122	static SYSDEV_CLASS_ATTR(current_governor, 0644, show_current_governor,
	123	store_current_governor);
4f86d3a8 LB	124
	125	static struct attribute *cpuclass_switch_attrs[] = {
	126	&attr_available_governors.attr,
	127	&attr_current_driver.attr,
	128	&attr_current_governor.attr,
	129	NULL
	130	};
	131
	132	static struct attribute_group cpuclass_attr_group = {
	133	.attrs = cpuclass_default_attrs,
	134	.name = "cpuidle",
	135	};
	136
	137	/**
	138	* cpuidle_add_class_sysfs - add CPU global sysfs attributes
	139	*/
	140	int cpuidle_add_class_sysfs(struct sysdev_class *cls)
	141	{
	142	if (sysfs_switch)
	143	cpuclass_attr_group.attrs = cpuclass_switch_attrs;
	144
	145	return sysfs_create_group(&cls->kset.kobj, &cpuclass_attr_group);
	146	}
	147
	148	/**
	149	* cpuidle_remove_class_sysfs - remove CPU global sysfs attributes
	150	*/
	151	void cpuidle_remove_class_sysfs(struct sysdev_class *cls)
	152	{
	153	sysfs_remove_group(&cls->kset.kobj, &cpuclass_attr_group);
	154	}
	155
	156	struct cpuidle_attr {
	157	struct attribute attr;
	158	ssize_t (show)(struct cpuidle_device , char *);
	159	ssize_t (store)(struct cpuidle_device , const char *, size_t count);
	160	};
	161
	162	#define define_one_ro(_name, show) \
	163	static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
	164	#define define_one_rw(_name, show, store) \
	165	static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store)
	166
	167	#define kobj_to_cpuidledev(k) container_of(k, struct cpuidle_device, kobj)
	168	#define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr)
	169	static ssize_t cpuidle_show(struct kobject * kobj, struct attribute * attr ,char * buf)
	170	{
	171	int ret = -EIO;
	172	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
	173	struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);
	174
	175	if (cattr->show) {
	176	mutex_lock(&cpuidle_lock);
	177	ret = cattr->show(dev, buf);
	178	mutex_unlock(&cpuidle_lock);
	179	}
	180	return ret;
	181	}
	182
	183	static ssize_t cpuidle_store(struct kobject * kobj, struct attribute * attr,
	184	const char * buf, size_t count)
	185	{
	186	int ret = -EIO;
	187	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
188	struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);
189
190	if (cattr->store) {
191	mutex_lock(&cpuidle_lock);
192	ret = cattr->store(dev, buf, count);
193	mutex_unlock(&cpuidle_lock);
194	}
195	return ret;
196	}
197
52cf25d0	198	static const struct sysfs_ops cpuidle_sysfs_ops = {
4f86d3a8 LB	199	.show = cpuidle_show,
	200	.store = cpuidle_store,
	201	};
	202
	203	static void cpuidle_sysfs_release(struct kobject *kobj)
	204	{
	205	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
	206
	207	complete(&dev->kobj_unregister);
	208	}
	209
	210	static struct kobj_type ktype_cpuidle = {
	211	.sysfs_ops = &cpuidle_sysfs_ops,
	212	.release = cpuidle_sysfs_release,
	213	};
	214
	215	struct cpuidle_state_attr {
	216	struct attribute attr;
	217	ssize_t (show)(struct cpuidle_state , char *);
	218	ssize_t (store)(struct cpuidle_state , const char *, size_t);
	219	};
	220
	221	#define define_one_state_ro(_name, show) \
	222	static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
	223
	224	#define define_show_state_function(_name) \
	225	static ssize_t show_state_##_name(struct cpuidle_state state, char buf) \
	226	{ \
	227	return sprintf(buf, "%u\n", state->_name);\
	228	}
	229
8b78cf60 YY	230	#define define_show_state_ull_function(_name) \
	231	static ssize_t show_state_##_name(struct cpuidle_state state, char buf) \
	232	{ \
	233	return sprintf(buf, "%llu\n", state->_name);\
	234	}
	235
4fcb2fcd VP	236	#define define_show_state_str_function(_name) \
	237	static ssize_t show_state_##_name(struct cpuidle_state state, char buf) \
	238	{ \
	239	if (state->_name[0] == '\0')\
	240	return sprintf(buf, "<null>\n");\
	241	return sprintf(buf, "%s\n", state->_name);\
4f86d3a8 LB	242	}
	243
	244	define_show_state_function(exit_latency)
	245	define_show_state_function(power_usage)
8b78cf60 YY	246	define_show_state_ull_function(usage)
8b78cf60 YY	247	define_show_state_ull_function(time)
4fcb2fcd VP	248	define_show_state_str_function(name)
	249	define_show_state_str_function(desc)
	250
4f86d3a8	251	define_one_state_ro(name, show_state_name);
4fcb2fcd	252	define_one_state_ro(desc, show_state_desc);
4f86d3a8 LB	253	define_one_state_ro(latency, show_state_exit_latency);
	254	define_one_state_ro(power, show_state_power_usage);
	255	define_one_state_ro(usage, show_state_usage);
	256	define_one_state_ro(time, show_state_time);
	257
	258	static struct attribute *cpuidle_state_default_attrs[] = {
	259	&attr_name.attr,
4fcb2fcd	260	&attr_desc.attr,
4f86d3a8 LB	261	&attr_latency.attr,
	262	&attr_power.attr,
	263	&attr_usage.attr,
	264	&attr_time.attr,
	265	NULL
	266	};
	267
	268	#define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
	269	#define kobj_to_state(k) (kobj_to_state_obj(k)->state)
	270	#define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)
	271	static ssize_t cpuidle_state_show(struct kobject * kobj,
	272	struct attribute * attr ,char * buf)
	273	{
	274	int ret = -EIO;
	275	struct cpuidle_state *state = kobj_to_state(kobj);
	276	struct cpuidle_state_attr * cattr = attr_to_stateattr(attr);
	277
	278	if (cattr->show)
	279	ret = cattr->show(state, buf);
	280
	281	return ret;
	282	}
	283
52cf25d0	284	static const struct sysfs_ops cpuidle_state_sysfs_ops = {
4f86d3a8 LB	285	.show = cpuidle_state_show,
	286	};
	287
	288	static void cpuidle_state_sysfs_release(struct kobject *kobj)
	289	{
	290	struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj);
	291
	292	complete(&state_obj->kobj_unregister);
	293	}
	294
	295	static struct kobj_type ktype_state_cpuidle = {
	296	.sysfs_ops = &cpuidle_state_sysfs_ops,
	297	.default_attrs = cpuidle_state_default_attrs,
	298	.release = cpuidle_state_sysfs_release,
	299	};
	300
	301	static void inline cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
	302	{
c10997f6	303	kobject_put(&device->kobjs[i]->kobj);
4f86d3a8 LB	304	wait_for_completion(&device->kobjs[i]->kobj_unregister);
	305	kfree(device->kobjs[i]);
	306	device->kobjs[i] = NULL;
	307	}
	308
	309	/**
	310	* cpuidle_add_driver_sysfs - adds driver-specific sysfs attributes
	311	* @device: the target device
	312	*/
	313	int cpuidle_add_state_sysfs(struct cpuidle_device *device)
	314	{
	315	int i, ret = -ENOMEM;
	316	struct cpuidle_state_kobj *kobj;
	317
	318	/* state statistics */
	319	for (i = 0; i < device->state_count; i++) {
	320	kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
	321	if (!kobj)
	322	goto error_state;
	323	kobj->state = &device->states[i];
	324	init_completion(&kobj->kobj_unregister);
	325
94f57f33 GKH	326	ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, &device->kobj,
94f57f33 GKH	327	"state%d", i);
4f86d3a8 LB	328	if (ret) {
	329	kfree(kobj);
	330	goto error_state;
	331	}
94f57f33	332	kobject_uevent(&kobj->kobj, KOBJ_ADD);
4f86d3a8 LB	333	device->kobjs[i] = kobj;
	334	}
	335
	336	return 0;
	337
	338	error_state:
	339	for (i = i - 1; i >= 0; i--)
	340	cpuidle_free_state_kobj(device, i);
	341	return ret;
	342	}
	343
	344	/**
	345	* cpuidle_remove_driver_sysfs - removes driver-specific sysfs attributes
	346	* @device: the target device
	347	*/
	348	void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
	349	{
	350	int i;
	351
	352	for (i = 0; i < device->state_count; i++)
	353	cpuidle_free_state_kobj(device, i);
	354	}
	355
	356	/**
	357	* cpuidle_add_sysfs - creates a sysfs instance for the target device
	358	* @sysdev: the target device
	359	*/
	360	int cpuidle_add_sysfs(struct sys_device *sysdev)
	361	{
	362	int cpu = sysdev->id;
	363	struct cpuidle_device *dev;
94f57f33	364	int error;
4f86d3a8 LB	365
4f86d3a8 LB	366	dev = per_cpu(cpuidle_devices, cpu);
94f57f33 GKH	367	error = kobject_init_and_add(&dev->kobj, &ktype_cpuidle, &sysdev->kobj,
	368	"cpuidle");
	369	if (!error)
	370	kobject_uevent(&dev->kobj, KOBJ_ADD);
	371	return error;
4f86d3a8 LB	372	}
	373
	374	/**
	375	* cpuidle_remove_sysfs - deletes a sysfs instance on the target device
	376	* @sysdev: the target device
	377	*/
	378	void cpuidle_remove_sysfs(struct sys_device *sysdev)
	379	{
	380	int cpu = sysdev->id;
	381	struct cpuidle_device *dev;
	382
	383	dev = per_cpu(cpuidle_devices, cpu);
c10997f6	384	kobject_put(&dev->kobj);
4f86d3a8	385	}