[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;
	struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver();

	spin_lock(&cpuidle_driver_lock);
	if (cpuidle_driver)
		ret = sprintf(buf, "%s\n", cpuidle_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	{
4f86d3a8 LB	49	ssize_t ret;
752138df	50	struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver();
4f86d3a8 LB	51
4f86d3a8 LB	52	spin_lock(&cpuidle_driver_lock);
752138df LB	53	if (cpuidle_driver)
752138df LB	54	ret = sprintf(buf, "%s\n", cpuidle_driver->name);
4f86d3a8 LB	55	else
	56	ret = sprintf(buf, "none\n");
	57	spin_unlock(&cpuidle_driver_lock);
	58
	59	return ret;
	60	}
	61
66198f36	62	static ssize_t show_current_governor(struct sysdev_class *class,
c9be0a36	63	struct sysdev_class_attribute *attr,
66198f36	64	char *buf)
4f86d3a8 LB	65	{
	66	ssize_t ret;
	67
	68	mutex_lock(&cpuidle_lock);
	69	if (cpuidle_curr_governor)
	70	ret = sprintf(buf, "%s\n", cpuidle_curr_governor->name);
	71	else
	72	ret = sprintf(buf, "none\n");
	73	mutex_unlock(&cpuidle_lock);
	74
	75	return ret;
	76	}
	77
66198f36	78	static ssize_t store_current_governor(struct sysdev_class *class,
c9be0a36	79	struct sysdev_class_attribute *attr,
66198f36	80	const char *buf, size_t count)
4f86d3a8 LB	81	{
	82	char gov_name[CPUIDLE_NAME_LEN];
	83	int ret = -EINVAL;
	84	size_t len = count;
	85	struct cpuidle_governor *gov;
	86
	87	if (!len \|\| len >= sizeof(gov_name))
	88	return -EINVAL;
	89
	90	memcpy(gov_name, buf, len);
	91	gov_name[len] = '\0';
	92	if (gov_name[len - 1] == '\n')
	93	gov_name[--len] = '\0';
	94
	95	mutex_lock(&cpuidle_lock);
	96
	97	list_for_each_entry(gov, &cpuidle_governors, governor_list) {
	98	if (strlen(gov->name) == len && !strcmp(gov->name, gov_name)) {
	99	ret = cpuidle_switch_governor(gov);
	100	break;
	101	}
	102	}
	103
	104	mutex_unlock(&cpuidle_lock);
	105
	106	if (ret)
	107	return ret;
	108	else
	109	return count;
	110	}
	111
66198f36 RV	112	static SYSDEV_CLASS_ATTR(current_driver, 0444, show_current_driver, NULL);
	113	static SYSDEV_CLASS_ATTR(current_governor_ro, 0444, show_current_governor,
	114	NULL);
4f86d3a8 LB	115
	116	static struct attribute *cpuclass_default_attrs[] = {
	117	&attr_current_driver.attr,
	118	&attr_current_governor_ro.attr,
	119	NULL
	120	};
	121
66198f36 RV	122	static SYSDEV_CLASS_ATTR(available_governors, 0444, show_available_governors,
	123	NULL);
	124	static SYSDEV_CLASS_ATTR(current_governor, 0644, show_current_governor,
	125	store_current_governor);
4f86d3a8 LB	126
	127	static struct attribute *cpuclass_switch_attrs[] = {
	128	&attr_available_governors.attr,
	129	&attr_current_driver.attr,
	130	&attr_current_governor.attr,
	131	NULL
	132	};
	133
	134	static struct attribute_group cpuclass_attr_group = {
	135	.attrs = cpuclass_default_attrs,
	136	.name = "cpuidle",
	137	};
	138
	139	/**
	140	* cpuidle_add_class_sysfs - add CPU global sysfs attributes
	141	*/
	142	int cpuidle_add_class_sysfs(struct sysdev_class *cls)
	143	{
	144	if (sysfs_switch)
	145	cpuclass_attr_group.attrs = cpuclass_switch_attrs;
	146
	147	return sysfs_create_group(&cls->kset.kobj, &cpuclass_attr_group);
	148	}
	149
	150	/**
	151	* cpuidle_remove_class_sysfs - remove CPU global sysfs attributes
	152	*/
	153	void cpuidle_remove_class_sysfs(struct sysdev_class *cls)
	154	{
	155	sysfs_remove_group(&cls->kset.kobj, &cpuclass_attr_group);
	156	}
	157
	158	struct cpuidle_attr {
	159	struct attribute attr;
	160	ssize_t (show)(struct cpuidle_device , char *);
	161	ssize_t (store)(struct cpuidle_device , const char *, size_t count);
	162	};
	163
	164	#define define_one_ro(_name, show) \
	165	static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
	166	#define define_one_rw(_name, show, store) \
	167	static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store)
	168
	169	#define kobj_to_cpuidledev(k) container_of(k, struct cpuidle_device, kobj)
	170	#define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr)
	171	static ssize_t cpuidle_show(struct kobject * kobj, struct attribute * attr ,char * buf)
	172	{
	173	int ret = -EIO;
	174	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
	175	struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);
	176
	177	if (cattr->show) {
	178	mutex_lock(&cpuidle_lock);
	179	ret = cattr->show(dev, buf);
	180	mutex_unlock(&cpuidle_lock);
	181	}
	182	return ret;
	183	}
	184
	185	static ssize_t cpuidle_store(struct kobject * kobj, struct attribute * attr,
	186	const char * buf, size_t count)
	187	{
	188	int ret = -EIO;
	189	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
190	struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);
191
192	if (cattr->store) {
193	mutex_lock(&cpuidle_lock);
194	ret = cattr->store(dev, buf, count);
195	mutex_unlock(&cpuidle_lock);
196	}
197	return ret;
198	}
199
52cf25d0	200	static const struct sysfs_ops cpuidle_sysfs_ops = {
4f86d3a8 LB	201	.show = cpuidle_show,
	202	.store = cpuidle_store,
	203	};
	204
	205	static void cpuidle_sysfs_release(struct kobject *kobj)
	206	{
	207	struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
	208
	209	complete(&dev->kobj_unregister);
	210	}
	211
	212	static struct kobj_type ktype_cpuidle = {
	213	.sysfs_ops = &cpuidle_sysfs_ops,
	214	.release = cpuidle_sysfs_release,
	215	};
	216
	217	struct cpuidle_state_attr {
	218	struct attribute attr;
	219	ssize_t (show)(struct cpuidle_state , char *);
	220	ssize_t (store)(struct cpuidle_state , const char *, size_t);
	221	};
	222
	223	#define define_one_state_ro(_name, show) \
	224	static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
	225
	226	#define define_show_state_function(_name) \
	227	static ssize_t show_state_##_name(struct cpuidle_state state, char buf) \
	228	{ \
	229	return sprintf(buf, "%u\n", state->_name);\
	230	}
	231
8b78cf60 YY	232	#define define_show_state_ull_function(_name) \
	233	static ssize_t show_state_##_name(struct cpuidle_state state, char buf) \
	234	{ \
	235	return sprintf(buf, "%llu\n", state->_name);\
	236	}
	237
4fcb2fcd VP	238	#define define_show_state_str_function(_name) \
	239	static ssize_t show_state_##_name(struct cpuidle_state state, char buf) \
	240	{ \
	241	if (state->_name[0] == '\0')\
	242	return sprintf(buf, "<null>\n");\
	243	return sprintf(buf, "%s\n", state->_name);\
4f86d3a8 LB	244	}
	245
	246	define_show_state_function(exit_latency)
	247	define_show_state_function(power_usage)
8b78cf60 YY	248	define_show_state_ull_function(usage)
8b78cf60 YY	249	define_show_state_ull_function(time)
4fcb2fcd VP	250	define_show_state_str_function(name)
	251	define_show_state_str_function(desc)
	252
4f86d3a8	253	define_one_state_ro(name, show_state_name);
4fcb2fcd	254	define_one_state_ro(desc, show_state_desc);
4f86d3a8 LB	255	define_one_state_ro(latency, show_state_exit_latency);
	256	define_one_state_ro(power, show_state_power_usage);
	257	define_one_state_ro(usage, show_state_usage);
	258	define_one_state_ro(time, show_state_time);
	259
	260	static struct attribute *cpuidle_state_default_attrs[] = {
	261	&attr_name.attr,
4fcb2fcd	262	&attr_desc.attr,
4f86d3a8 LB	263	&attr_latency.attr,
	264	&attr_power.attr,
	265	&attr_usage.attr,
	266	&attr_time.attr,
	267	NULL
	268	};
	269
	270	#define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
	271	#define kobj_to_state(k) (kobj_to_state_obj(k)->state)
	272	#define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)
	273	static ssize_t cpuidle_state_show(struct kobject * kobj,
	274	struct attribute * attr ,char * buf)
	275	{
	276	int ret = -EIO;
	277	struct cpuidle_state *state = kobj_to_state(kobj);
	278	struct cpuidle_state_attr * cattr = attr_to_stateattr(attr);
	279
	280	if (cattr->show)
	281	ret = cattr->show(state, buf);
	282
	283	return ret;
	284	}
	285
52cf25d0	286	static const struct sysfs_ops cpuidle_state_sysfs_ops = {
4f86d3a8 LB	287	.show = cpuidle_state_show,
	288	};
	289
	290	static void cpuidle_state_sysfs_release(struct kobject *kobj)
	291	{
	292	struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj);
	293
	294	complete(&state_obj->kobj_unregister);
	295	}
	296
	297	static struct kobj_type ktype_state_cpuidle = {
	298	.sysfs_ops = &cpuidle_state_sysfs_ops,
	299	.default_attrs = cpuidle_state_default_attrs,
	300	.release = cpuidle_state_sysfs_release,
	301	};
	302
	303	static void inline cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
	304	{
c10997f6	305	kobject_put(&device->kobjs[i]->kobj);
4f86d3a8 LB	306	wait_for_completion(&device->kobjs[i]->kobj_unregister);
	307	kfree(device->kobjs[i]);
	308	device->kobjs[i] = NULL;
	309	}
	310
	311	/**
	312	* cpuidle_add_driver_sysfs - adds driver-specific sysfs attributes
	313	* @device: the target device
	314	*/
	315	int cpuidle_add_state_sysfs(struct cpuidle_device *device)
	316	{
	317	int i, ret = -ENOMEM;
	318	struct cpuidle_state_kobj *kobj;
	319
	320	/* state statistics */
	321	for (i = 0; i < device->state_count; i++) {
	322	kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
	323	if (!kobj)
	324	goto error_state;
	325	kobj->state = &device->states[i];
	326	init_completion(&kobj->kobj_unregister);
	327
94f57f33 GKH	328	ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, &device->kobj,
94f57f33 GKH	329	"state%d", i);
4f86d3a8 LB	330	if (ret) {
	331	kfree(kobj);
	332	goto error_state;
	333	}
94f57f33	334	kobject_uevent(&kobj->kobj, KOBJ_ADD);
4f86d3a8 LB	335	device->kobjs[i] = kobj;
	336	}
	337
	338	return 0;
	339
	340	error_state:
	341	for (i = i - 1; i >= 0; i--)
	342	cpuidle_free_state_kobj(device, i);
	343	return ret;
	344	}
	345
	346	/**
	347	* cpuidle_remove_driver_sysfs - removes driver-specific sysfs attributes
	348	* @device: the target device
	349	*/
	350	void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
	351	{
	352	int i;
	353
	354	for (i = 0; i < device->state_count; i++)
	355	cpuidle_free_state_kobj(device, i);
	356	}
	357
	358	/**
	359	* cpuidle_add_sysfs - creates a sysfs instance for the target device
	360	* @sysdev: the target device
	361	*/
	362	int cpuidle_add_sysfs(struct sys_device *sysdev)
	363	{
	364	int cpu = sysdev->id;
	365	struct cpuidle_device *dev;
94f57f33	366	int error;
4f86d3a8 LB	367
4f86d3a8 LB	368	dev = per_cpu(cpuidle_devices, cpu);
94f57f33 GKH	369	error = kobject_init_and_add(&dev->kobj, &ktype_cpuidle, &sysdev->kobj,
	370	"cpuidle");
	371	if (!error)
	372	kobject_uevent(&dev->kobj, KOBJ_ADD);
	373	return error;
4f86d3a8 LB	374	}
	375
	376	/**
	377	* cpuidle_remove_sysfs - deletes a sysfs instance on the target device
	378	* @sysdev: the target device
	379	*/
	380	void cpuidle_remove_sysfs(struct sys_device *sysdev)
	381	{
	382	int cpu = sysdev->id;
	383	struct cpuidle_device *dev;
	384
	385	dev = per_cpu(cpuidle_devices, cpu);
c10997f6	386	kobject_put(&dev->kobj);
4f86d3a8	387	}