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Commit 51315cdf authored by Thomas Petazzoni's avatar Thomas Petazzoni Committed by Rafael J. Wysocki
Browse files

cpufreq: allow driver-specific data 



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: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent f114040e

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)