[net-next-2.6.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/slab.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>
5a0e3ad6	12	#include <linux/slab.h>
4f86d3a8 LB	13	#include <linux/cpu.h>
	14
	15	#include "cpuidle.h"
	16
	17	static unsigned int sysfs_switch;
	18	static int __init cpuidle_sysfs_setup(char *unused)
	19	{
	20	sysfs_switch = 1;
	21	return 1;
	22	}
	23	__setup("cpuidle_sysfs_switch", cpuidle_sysfs_setup);
	24
66198f36	25	static ssize_t show_available_governors(struct sysdev_class *class,
c9be0a36	26	struct sysdev_class_attribute *attr,
66198f36	27	char *buf)
4f86d3a8 LB	28	{
	29	ssize_t i = 0;
	30	struct cpuidle_governor *tmp;
	31
	32	mutex_lock(&cpuidle_lock);
	33	list_for_each_entry(tmp, &cpuidle_governors, governor_list) {
	34	if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) - CPUIDLE_NAME_LEN - 2))
	35	goto out;
	36	i += scnprintf(&buf[i], CPUIDLE_NAME_LEN, "%s ", tmp->name);
	37	}
	38
	39	out:
	40	i+= sprintf(&buf[i], "\n");
	41	mutex_unlock(&cpuidle_lock);
	42	return i;
	43	}
	44
66198f36	45	static ssize_t show_current_driver(struct sysdev_class *class,
c9be0a36	46	struct sysdev_class_attribute *attr,
66198f36	47	char *buf)
4f86d3a8 LB	48	{
	49	ssize_t ret;
	50
	51	spin_lock(&cpuidle_driver_lock);
	52	if (cpuidle_curr_driver)
	53	ret = sprintf(buf, "%s\n", cpuidle_curr_driver->name);
	54	else
	55	ret = sprintf(buf, "none\n");
	56	spin_unlock(&cpuidle_driver_lock);
	57
	58	return ret;
	59	}
	60
66198f36	61	static ssize_t show_current_governor(struct sysdev_class *class,
c9be0a36	62	struct sysdev_class_attribute *attr,
66198f36	63	char *buf)
4f86d3a8 LB	64	{
	65	ssize_t ret;
	66
	67	mutex_lock(&cpuidle_lock);
	68	if (cpuidle_curr_governor)
	69	ret = sprintf(buf, "%s\n", cpuidle_curr_governor->name);
	70	else
	71	ret = sprintf(buf, "none\n");
	72	mutex_unlock(&cpuidle_lock);
	73
	74	return ret;
	75	}
	76
66198f36	77	static ssize_t store_current_governor(struct sysdev_class *class,
c9be0a36	78	struct sysdev_class_attribute *attr,
66198f36	79	const char *buf, size_t count)
4f86d3a8 LB	80	{
	81	char gov_name[CPUIDLE_NAME_LEN];
	82	int ret = -EINVAL;
	83	size_t len = count;
	84	struct cpuidle_governor *gov;
	85
	86	if (!len \|\| len >= sizeof(gov_name))
	87	return -EINVAL;
	88
	89	memcpy(gov_name, buf, len);
	90	gov_name[len] = '\0';
	91	if (gov_name[len - 1] == '\n')
	92	gov_name[--len] = '\0';
	93
	94	mutex_lock(&cpuidle_lock);
	95
	96	list_for_each_entry(gov, &cpuidle_governors, governor_list) {
	97	if (strlen(gov->name) == len && !strcmp(gov->name, gov_name)) {
	98	ret = cpuidle_switch_governor(gov);
	99	break;
	100	}
	101	}
	102
	103	mutex_unlock(&cpuidle_lock);
	104
	105	if (ret)
	106	return ret;
	107	else
	108	return count;
	109	}
	110
66198f36 RV	111	static SYSDEV_CLASS_ATTR(current_driver, 0444, show_current_driver, NULL);
	112	static SYSDEV_CLASS_ATTR(current_governor_ro, 0444, show_current_governor,
	113	NULL);
4f86d3a8 LB	114
	115	static struct attribute *cpuclass_default_attrs[] = {
	116	&attr_current_driver.attr,
	117	&attr_current_governor_ro.attr,
	118	NULL
	119	};
	120
66198f36 RV	121	static SYSDEV_CLASS_ATTR(available_governors, 0444, show_available_governors,
	122	NULL);
	123	static SYSDEV_CLASS_ATTR(current_governor, 0644, show_current_governor,
	124	store_current_governor);
4f86d3a8 LB	125
	126	static struct attribute *cpuclass_switch_attrs[] = {
	127	&attr_available_governors.attr,
	128	&attr_current_driver.attr,
	129	&attr_current_governor.attr,
	130	NULL
	131	};
	132
	133	static struct attribute_group cpuclass_attr_group = {
	134	.attrs = cpuclass_default_attrs,
	135	.name = "cpuidle",
	136	};
	137
	138	/**
	139	* cpuidle_add_class_sysfs - add CPU global sysfs attributes
	140	*/
	141	int cpuidle_add_class_sysfs(struct sysdev_class *cls)
	142	{
	143	if (sysfs_switch)
	144	cpuclass_attr_group.attrs = cpuclass_switch_attrs;
	145
	146	return sysfs_create_group(&cls->kset.kobj, &cpuclass_attr_group);
	147	}
	148
	149	/**
	150	* cpuidle_remove_class_sysfs - remove CPU global sysfs attributes
	151	*/
	152	void cpuidle_remove_class_sysfs(struct sysdev_class *cls)
	153	{
	154	sysfs_remove_group(&cls->kset.kobj, &cpuclass_attr_group);
	155	}
	156
	157	struct cpuidle_attr {
	158	struct attribute attr;
	159	ssize_t (show)(struct cpuidle_device , char *);
	160	ssize_t (store)(struct cpuidle_device , const char *, size_t count);
	161	};
	162
	163	#define define_one_ro(_name, show) \
	164	static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
	165	#define define_one_rw(_name, show, store) \
	166	static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store)
	167
	168	#define kobj_to_cpuidledev(k) container_of(k, struct cpuidle_device, kobj)
	169	#define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr)
	170	static ssize_t cpuidle_show(struct kobject * kobj, struct attribute * attr ,char * buf)
	171	{
	172	int ret = -EIO;
	173	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
	174	struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);
	175
	176	if (cattr->show) {
	177	mutex_lock(&cpuidle_lock);
	178	ret = cattr->show(dev, buf);
	179	mutex_unlock(&cpuidle_lock);
	180	}
	181	return ret;
	182	}
	183
	184	static ssize_t cpuidle_store(struct kobject * kobj, struct attribute * attr,
	185	const char * buf, size_t count)
	186	{
	187	int ret = -EIO;
	188	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
189	struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);
190
191	if (cattr->store) {
192	mutex_lock(&cpuidle_lock);
193	ret = cattr->store(dev, buf, count);
194	mutex_unlock(&cpuidle_lock);
195	}
196	return ret;
197	}
198
52cf25d0	199	static const struct sysfs_ops cpuidle_sysfs_ops = {
4f86d3a8 LB	200	.show = cpuidle_show,
	201	.store = cpuidle_store,
	202	};
	203
	204	static void cpuidle_sysfs_release(struct kobject *kobj)
	205	{
	206	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
	207
	208	complete(&dev->kobj_unregister);
	209	}
	210
	211	static struct kobj_type ktype_cpuidle = {
	212	.sysfs_ops = &cpuidle_sysfs_ops,
	213	.release = cpuidle_sysfs_release,
	214	};
	215
	216	struct cpuidle_state_attr {
	217	struct attribute attr;
	218	ssize_t (show)(struct cpuidle_state , char *);
	219	ssize_t (store)(struct cpuidle_state , const char *, size_t);
	220	};
	221
	222	#define define_one_state_ro(_name, show) \
	223	static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
	224
	225	#define define_show_state_function(_name) \
	226	static ssize_t show_state_##_name(struct cpuidle_state state, char buf) \
	227	{ \
	228	return sprintf(buf, "%u\n", state->_name);\
	229	}
	230
8b78cf60 YY	231	#define define_show_state_ull_function(_name) \
	232	static ssize_t show_state_##_name(struct cpuidle_state state, char buf) \
	233	{ \
	234	return sprintf(buf, "%llu\n", state->_name);\
	235	}
	236
4fcb2fcd VP	237	#define define_show_state_str_function(_name) \
	238	static ssize_t show_state_##_name(struct cpuidle_state state, char buf) \
	239	{ \
	240	if (state->_name[0] == '\0')\
	241	return sprintf(buf, "<null>\n");\
	242	return sprintf(buf, "%s\n", state->_name);\
4f86d3a8 LB	243	}
	244
	245	define_show_state_function(exit_latency)
	246	define_show_state_function(power_usage)
8b78cf60 YY	247	define_show_state_ull_function(usage)
8b78cf60 YY	248	define_show_state_ull_function(time)
4fcb2fcd VP	249	define_show_state_str_function(name)
	250	define_show_state_str_function(desc)
	251
4f86d3a8	252	define_one_state_ro(name, show_state_name);
4fcb2fcd	253	define_one_state_ro(desc, show_state_desc);
4f86d3a8 LB	254	define_one_state_ro(latency, show_state_exit_latency);
	255	define_one_state_ro(power, show_state_power_usage);
	256	define_one_state_ro(usage, show_state_usage);
	257	define_one_state_ro(time, show_state_time);
	258
	259	static struct attribute *cpuidle_state_default_attrs[] = {
	260	&attr_name.attr,
4fcb2fcd	261	&attr_desc.attr,
4f86d3a8 LB	262	&attr_latency.attr,
	263	&attr_power.attr,
	264	&attr_usage.attr,
	265	&attr_time.attr,
	266	NULL
	267	};
	268
	269	#define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
	270	#define kobj_to_state(k) (kobj_to_state_obj(k)->state)
	271	#define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)
	272	static ssize_t cpuidle_state_show(struct kobject * kobj,
	273	struct attribute * attr ,char * buf)
	274	{
	275	int ret = -EIO;
	276	struct cpuidle_state *state = kobj_to_state(kobj);
	277	struct cpuidle_state_attr * cattr = attr_to_stateattr(attr);
	278
	279	if (cattr->show)
	280	ret = cattr->show(state, buf);
	281
	282	return ret;
	283	}
	284
52cf25d0	285	static const struct sysfs_ops cpuidle_state_sysfs_ops = {
4f86d3a8 LB	286	.show = cpuidle_state_show,
	287	};
	288
	289	static void cpuidle_state_sysfs_release(struct kobject *kobj)
	290	{
	291	struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj);
	292
	293	complete(&state_obj->kobj_unregister);
	294	}
	295
	296	static struct kobj_type ktype_state_cpuidle = {
	297	.sysfs_ops = &cpuidle_state_sysfs_ops,
	298	.default_attrs = cpuidle_state_default_attrs,
	299	.release = cpuidle_state_sysfs_release,
	300	};
	301
	302	static void inline cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
	303	{
c10997f6	304	kobject_put(&device->kobjs[i]->kobj);
4f86d3a8 LB	305	wait_for_completion(&device->kobjs[i]->kobj_unregister);
	306	kfree(device->kobjs[i]);
	307	device->kobjs[i] = NULL;
	308	}
	309
	310	/**
	311	* cpuidle_add_driver_sysfs - adds driver-specific sysfs attributes
	312	* @device: the target device
	313	*/
	314	int cpuidle_add_state_sysfs(struct cpuidle_device *device)
	315	{
	316	int i, ret = -ENOMEM;
	317	struct cpuidle_state_kobj *kobj;
	318
	319	/* state statistics */
	320	for (i = 0; i < device->state_count; i++) {
	321	kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
	322	if (!kobj)
	323	goto error_state;
	324	kobj->state = &device->states[i];
	325	init_completion(&kobj->kobj_unregister);
	326
94f57f33 GKH	327	ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, &device->kobj,
94f57f33 GKH	328	"state%d", i);
4f86d3a8 LB	329	if (ret) {
	330	kfree(kobj);
	331	goto error_state;
	332	}
94f57f33	333	kobject_uevent(&kobj->kobj, KOBJ_ADD);
4f86d3a8 LB	334	device->kobjs[i] = kobj;
	335	}
	336
	337	return 0;
	338
	339	error_state:
	340	for (i = i - 1; i >= 0; i--)
	341	cpuidle_free_state_kobj(device, i);
	342	return ret;
	343	}
	344
	345	/**
	346	* cpuidle_remove_driver_sysfs - removes driver-specific sysfs attributes
	347	* @device: the target device
	348	*/
	349	void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
	350	{
	351	int i;
	352
	353	for (i = 0; i < device->state_count; i++)
	354	cpuidle_free_state_kobj(device, i);
	355	}
	356
	357	/**
	358	* cpuidle_add_sysfs - creates a sysfs instance for the target device
	359	* @sysdev: the target device
	360	*/
	361	int cpuidle_add_sysfs(struct sys_device *sysdev)
	362	{
	363	int cpu = sysdev->id;
	364	struct cpuidle_device *dev;
94f57f33	365	int error;
4f86d3a8 LB	366
4f86d3a8 LB	367	dev = per_cpu(cpuidle_devices, cpu);
94f57f33 GKH	368	error = kobject_init_and_add(&dev->kobj, &ktype_cpuidle, &sysdev->kobj,
	369	"cpuidle");
	370	if (!error)
	371	kobject_uevent(&dev->kobj, KOBJ_ADD);
	372	return error;
4f86d3a8 LB	373	}
	374
	375	/**
	376	* cpuidle_remove_sysfs - deletes a sysfs instance on the target device
	377	* @sysdev: the target device
	378	*/
	379	void cpuidle_remove_sysfs(struct sys_device *sysdev)
	380	{
	381	int cpu = sysdev->id;
	382	struct cpuidle_device *dev;
	383
	384	dev = per_cpu(cpuidle_devices, cpu);
c10997f6	385	kobject_put(&dev->kobj);
4f86d3a8	386	}