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PM / devfreq: provide hooks for governors to be registered
Add devfreq_add_governor and devfreq_remove_governor which can be invoked by governors to register with devfreq. This sets up the stage to dynamically switch governors and allow governors to be dynamically loaded as well. Cc: Rajagopal Venkat <rajagopal.venkat@linaro.org> Cc: MyungJoo Ham <myungjoo.ham@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Kevin Hilman <khilman@ti.com> Cc: linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Nishanth Menon <nm@ti.com> Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
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@ -36,6 +36,8 @@ static struct class *devfreq_class;
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*/
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static struct workqueue_struct *devfreq_wq;
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/* The list of all device-devfreq governors */
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static LIST_HEAD(devfreq_governor_list);
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/* The list of all device-devfreq */
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static LIST_HEAD(devfreq_list);
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static DEFINE_MUTEX(devfreq_list_lock);
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@ -111,6 +113,32 @@ static int devfreq_update_status(struct devfreq *devfreq, unsigned long freq)
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return 0;
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}
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/**
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* find_devfreq_governor() - find devfreq governor from name
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* @name: name of the governor
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*
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* Search the list of devfreq governors and return the matched
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* governor's pointer. devfreq_list_lock should be held by the caller.
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*/
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static struct devfreq_governor *find_devfreq_governor(const char *name)
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{
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struct devfreq_governor *tmp_governor;
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if (unlikely(IS_ERR_OR_NULL(name))) {
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pr_err("DEVFREQ: %s: Invalid parameters\n", __func__);
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return ERR_PTR(-EINVAL);
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}
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WARN(!mutex_is_locked(&devfreq_list_lock),
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"devfreq_list_lock must be locked.");
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list_for_each_entry(tmp_governor, &devfreq_governor_list, node) {
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if (!strncmp(tmp_governor->name, name, DEVFREQ_NAME_LEN))
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return tmp_governor;
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}
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return ERR_PTR(-ENODEV);
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}
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/* Load monitoring helper functions for governors use */
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/**
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@ -515,6 +543,69 @@ int devfreq_resume_device(struct devfreq *devfreq)
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}
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EXPORT_SYMBOL(devfreq_resume_device);
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/**
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* devfreq_add_governor() - Add devfreq governor
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* @governor: the devfreq governor to be added
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*/
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int devfreq_add_governor(struct devfreq_governor *governor)
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{
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struct devfreq_governor *g;
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int err = 0;
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if (!governor) {
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pr_err("%s: Invalid parameters.\n", __func__);
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return -EINVAL;
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}
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mutex_lock(&devfreq_list_lock);
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g = find_devfreq_governor(governor->name);
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if (!IS_ERR(g)) {
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pr_err("%s: governor %s already registered\n", __func__,
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g->name);
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err = -EINVAL;
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goto err_out;
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}
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list_add(&governor->node, &devfreq_governor_list);
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err_out:
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mutex_unlock(&devfreq_list_lock);
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return err;
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}
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EXPORT_SYMBOL(devfreq_add_governor);
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/**
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* devfreq_remove_device() - Remove devfreq feature from a device.
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* @governor: the devfreq governor to be removed
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*/
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int devfreq_remove_governor(struct devfreq_governor *governor)
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{
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struct devfreq_governor *g;
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int err = 0;
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if (!governor) {
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pr_err("%s: Invalid parameters.\n", __func__);
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return -EINVAL;
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}
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mutex_lock(&devfreq_list_lock);
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g = find_devfreq_governor(governor->name);
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if (IS_ERR(g)) {
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pr_err("%s: governor %s not registered\n", __func__,
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g->name);
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err = -EINVAL;
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goto err_out;
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}
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list_del(&governor->node);
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err_out:
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mutex_unlock(&devfreq_list_lock);
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return err;
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}
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EXPORT_SYMBOL(devfreq_remove_governor);
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static ssize_t show_governor(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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@ -34,4 +34,8 @@ extern void devfreq_monitor_suspend(struct devfreq *devfreq);
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extern void devfreq_monitor_resume(struct devfreq *devfreq);
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extern void devfreq_interval_update(struct devfreq *devfreq,
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unsigned int *delay);
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extern int devfreq_add_governor(struct devfreq_governor *governor);
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extern int devfreq_remove_governor(struct devfreq_governor *governor);
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#endif /* _GOVERNOR_H */
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@ -92,6 +92,7 @@ struct devfreq_dev_profile {
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/**
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* struct devfreq_governor - Devfreq policy governor
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* @node: list node - contains registered devfreq governors
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* @name: Governor's name
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* @get_target_freq: Returns desired operating frequency for the device.
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* Basically, get_target_freq will run
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@ -107,6 +108,8 @@ struct devfreq_dev_profile {
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* Note that the callbacks are called with devfreq->lock locked by devfreq.
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*/
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struct devfreq_governor {
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struct list_head node;
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const char name[DEVFREQ_NAME_LEN];
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int (*get_target_freq)(struct devfreq *this, unsigned long *freq);
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int (*event_handler)(struct devfreq *devfreq,
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