diff options
Diffstat (limited to 'drivers/devfreq/devfreq.c')
| -rw-r--r-- | drivers/devfreq/devfreq.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index c189b82f5ec..a129a7b6bfd 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -501,12 +501,82 @@ static ssize_t show_central_polling(struct device *dev, !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), { }, }; |