linux-imx

/*

 * 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 <linux/completion.h>

#include <linux/capability.h>

#include <linux/device.h>

#include <linux/kobject.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 device *dev,

                    struct device_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 device *dev,

                   struct device_attribute *attr,

                   char *buf)

{

    ssize_t ret;

    struct cpuidle_driver *drv;

​

    spin_lock(&cpuidle_driver_lock);

    drv = cpuidle_get_driver();

    if (drv)

        ret = sprintf(buf, "%s\n", drv->name);

    else

        ret = sprintf(buf, "none\n");

    spin_unlock(&cpuidle_driver_lock);