diff options
Diffstat (limited to 'drivers/cpufreq/cpufreq_governor.c')
-rw-r--r-- | drivers/cpufreq/cpufreq_governor.c | 64 |
1 files changed, 57 insertions, 7 deletions
diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c index 3569782..00cb468 100644 --- a/drivers/cpufreq/cpufreq_governor.c +++ b/drivers/cpufreq/cpufreq_governor.c @@ -25,12 +25,58 @@ DEFINE_MUTEX(dbs_data_mutex); EXPORT_SYMBOL_GPL(dbs_data_mutex); -static struct attribute_group *get_sysfs_attr(struct dbs_governor *gov) +static inline struct dbs_data *to_dbs_data(struct kobject *kobj) { - return have_governor_per_policy() ? - gov->attr_group_gov_pol : gov->attr_group_gov_sys; + return container_of(kobj, struct dbs_data, kobj); } +static inline struct governor_attr *to_gov_attr(struct attribute *attr) +{ + return container_of(attr, struct governor_attr, attr); +} + +static ssize_t governor_show(struct kobject *kobj, struct attribute *attr, + char *buf) +{ + struct dbs_data *dbs_data = to_dbs_data(kobj); + struct governor_attr *gattr = to_gov_attr(attr); + int ret = -EIO; + + if (gattr->show) + ret = gattr->show(dbs_data, buf); + + return ret; +} + +static ssize_t governor_store(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t count) +{ + struct dbs_data *dbs_data = to_dbs_data(kobj); + struct governor_attr *gattr = to_gov_attr(attr); + int ret = -EIO; + + mutex_lock(&dbs_data->mutex); + + if (gattr->store) + ret = gattr->store(dbs_data, buf, count); + + mutex_unlock(&dbs_data->mutex); + + return ret; +} + +/* + * Sysfs Ops for accessing governor attributes. + * + * All show/store invocations for governor specific sysfs attributes, will first + * call the below show/store callbacks and the attribute specific callback will + * be called from within it. + */ +static const struct sysfs_ops governor_sysfs_ops = { + .show = governor_show, + .store = governor_store, +}; + void dbs_check_cpu(struct cpufreq_policy *policy) { int cpu = policy->cpu; @@ -352,6 +398,7 @@ static int cpufreq_governor_init(struct cpufreq_policy *policy) } dbs_data->usage_count = 1; + mutex_init(&dbs_data->mutex); ret = gov->init(dbs_data, !policy->governor->initialized); if (ret) @@ -374,12 +421,15 @@ static int cpufreq_governor_init(struct cpufreq_policy *policy) policy_dbs->dbs_data = dbs_data; policy->governor_data = policy_dbs; - ret = sysfs_create_group(get_governor_parent_kobj(policy), - get_sysfs_attr(gov)); + gov->kobj_type.sysfs_ops = &governor_sysfs_ops; + ret = kobject_init_and_add(&dbs_data->kobj, &gov->kobj_type, + get_governor_parent_kobj(policy), + "%s", gov->gov.name); if (!ret) return 0; /* Failure, so roll back. */ + pr_err("cpufreq: Governor initialization failed (dbs_data kobject init error %d)\n", ret); policy->governor_data = NULL; @@ -404,8 +454,7 @@ static int cpufreq_governor_exit(struct cpufreq_policy *policy) return -EBUSY; if (!--dbs_data->usage_count) { - sysfs_remove_group(get_governor_parent_kobj(policy), - get_sysfs_attr(gov)); + kobject_put(&dbs_data->kobj); policy->governor_data = NULL; @@ -413,6 +462,7 @@ static int cpufreq_governor_exit(struct cpufreq_policy *policy) gov->gdbs_data = NULL; gov->exit(dbs_data, policy->governor->initialized == 1); + mutex_destroy(&dbs_data->mutex); kfree(dbs_data); } else { policy->governor_data = NULL; |