cpufreq: allow driver-specific data (51315cdf) · Commits · 戴 / test

This commit extends the cpufreq_driver structure with an additional 'void *driver_data' field that can be filled by the ->probe() function of a cpufreq driver to pass additional custom information to the driver itself. A new function called cpufreq_get_driver_data() is added to allow a cpufreq driver to retrieve those driver data, since they are typically needed from a cpufreq_policy->init() callback, which does not have access to the cpufreq_driver structure. This function call is similar to the existing cpufreq_get_current_driver() function call. Signed-off-by:

Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Acked-by:

Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by:

Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/cpufreq.c

+15 −0

Original line number	Diff line number	Diff line
		@@ -1731,6 +1731,21 @@ const char *cpufreq_get_current_driver(void)
		}
		EXPORT_SYMBOL_GPL(cpufreq_get_current_driver);

		/**
		* cpufreq_get_driver_data - return current driver data
		*
		* Return the private data of the currently loaded cpufreq
		* driver, or NULL if no cpufreq driver is loaded.
		*/
		void *cpufreq_get_driver_data(void)
		{
		if (cpufreq_driver)
		return cpufreq_driver->driver_data;

		return NULL;
		}
		EXPORT_SYMBOL_GPL(cpufreq_get_driver_data);

		/*********************************************************************
		* NOTIFIER LISTS INTERFACE *
		*********************************************************************/

include/linux/cpufreq.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -219,6 +219,7 @@ __ATTR(_name, 0644, show_##_name, store_##_name)
		struct cpufreq_driver {
		char name[CPUFREQ_NAME_LEN];
		u8 flags;
		void *driver_data;

		/* needed by all drivers */
		int (init) (struct cpufreq_policy policy);
		@@ -312,6 +313,7 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data);
		int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);

		const char *cpufreq_get_current_driver(void);
		void *cpufreq_get_driver_data(void);

		static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
		unsigned int min, unsigned int max)

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