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