if (!IS_ERR(devfreq)) {
dev_err(dev, "%s: Unable to create devfreq for the device. It already has one.\n", __func__);
err = -EINVAL;
- goto out;
+ goto err_out;
}
}
dev_err(dev, "%s: Unable to create devfreq for the device\n",
__func__);
err = -ENOMEM;
- goto out;
+ goto err_out;
}
mutex_init(&devfreq->lock);
devfreq->next_polling);
}
mutex_unlock(&devfreq_list_lock);
- goto out;
+out:
+ return devfreq;
+
err_init:
device_unregister(&devfreq->dev);
err_dev:
mutex_unlock(&devfreq->lock);
kfree(devfreq);
-out:
- if (err)
- return ERR_PTR(err);
- else
- return devfreq;
+err_out:
+ return ERR_PTR(err);
}
/**
!to_devfreq(dev)->governor->no_central_polling);
}
+static ssize_t store_min_freq(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct devfreq *df = to_devfreq(dev);
+ unsigned long value;
+ int ret;
+ unsigned long max;
+
+ ret = sscanf(buf, "%lu", &value);
+ if (ret != 1)
+ goto out;
+
+ mutex_lock(&df->lock);
+ max = df->max_freq;
+ if (value && max && value > max) {
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ df->min_freq = value;
+ update_devfreq(df);
+ ret = count;
+unlock:
+ mutex_unlock(&df->lock);
+out:
+ return ret;
+}
+
+static ssize_t show_min_freq(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%lu\n", to_devfreq(dev)->min_freq);
+}
+
+static ssize_t store_max_freq(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct devfreq *df = to_devfreq(dev);
+ unsigned long value;
+ int ret;
+ unsigned long min;
+
+ ret = sscanf(buf, "%lu", &value);
+ if (ret != 1)
+ goto out;
+
+ mutex_lock(&df->lock);
+ min = df->min_freq;
+ if (value && min && value < min) {
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ df->max_freq = value;
+ update_devfreq(df);
+ ret = count;
+unlock:
+ mutex_unlock(&df->lock);
+out:
+ return ret;
+}
+
+static ssize_t show_max_freq(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%lu\n", to_devfreq(dev)->max_freq);
+}
+
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),
+ __ATTR(min_freq, S_IRUGO | S_IWUSR, show_min_freq, store_min_freq),
+ __ATTR(max_freq, S_IRUGO | S_IWUSR, show_max_freq, store_max_freq),
{ },
};