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PM / devfreq: Add common sysfs interfaces

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Device specific sysfs interface /sys/devices/.../power/devfreq_*
- governor	R: name of governor
- cur_freq	R: current frequency
- polling_interval	R: polling interval in ms given with devfreq profile
			W: update polling interval.
- central_polling	R: 1 if polling is managed by devfreq framework

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Mike Turquette <mturquette@ti.com>
Acked-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
--
 Documentation/ABI/testing/sysfs-class-devfreq |   44 ++++++++++++++++
 drivers/devfreq/devfreq.c                     |   69 ++++++++++++++++++++++++++
 2 files changed, 113 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-class-devfreq
This commit is contained in:
MyungJoo Ham
2011-10-02 00:19:28 +02:00
committed by Rafael J. Wysocki
parent a3c98b8b2e
commit 9005b65099
2 changed files with 113 additions and 0 deletions
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drivers/devfreq/devfreq.c
+69
View File
@@ -437,6 +437,74 @@ int devfreq_remove_device(struct devfreq *devfreq)
return 0;
}
static ssize_t show_governor(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%s\n", to_devfreq(dev)->governor->name);
}
static ssize_t show_freq(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%lu\n", to_devfreq(dev)->previous_freq);
}
static ssize_t show_polling_interval(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", to_devfreq(dev)->profile->polling_ms);
}
static ssize_t store_polling_interval(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct devfreq *df = to_devfreq(dev);
unsigned int value;
int ret;
ret = sscanf(buf, "%u", &value);
if (ret != 1)
goto out;
mutex_lock(&df->lock);
df->profile->polling_ms = value;
df->next_polling = df->polling_jiffies
= msecs_to_jiffies(value);
mutex_unlock(&df->lock);
ret = count;
if (df->governor->no_central_polling)
goto out;
mutex_lock(&devfreq_list_lock);
if (df->next_polling > 0 && !polling) {
polling = true;
queue_delayed_work(devfreq_wq, &devfreq_work,
df->next_polling);
}
mutex_unlock(&devfreq_list_lock);
out:
return ret;
}
static ssize_t show_central_polling(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n",
!to_devfreq(dev)->governor->no_central_polling);
}
static struct device_attribute devfreq_attrs[] = {
__ATTR(governor, S_IRUGO, show_governor, NULL),
__ATTR(cur_freq, S_IRUGO, show_freq, NULL),
__ATTR(central_polling, S_IRUGO, show_central_polling, NULL),
__ATTR(polling_interval, S_IRUGO | S_IWUSR, show_polling_interval,
store_polling_interval),
{ },
};
/**
* devfreq_start_polling() - Initialize data structure for devfreq framework and
* start polling registered devfreq devices.
@@ -461,6 +529,7 @@ static int __init devfreq_init(void)
pr_err("%s: couldn't create class\n", __FILE__);
return PTR_ERR(devfreq_class);
}
devfreq_class->dev_attrs = devfreq_attrs;
return 0;
}
subsys_initcall(devfreq_init);