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cpufreq: allow driver-specific data

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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>
This commit is contained in:
Thomas Petazzoni 2014-10-19 11:30:27 +02:00 committed by Rafael J. Wysocki
parent f114040e3e
commit 51315cdfa0
2 changed files with 17 additions and 0 deletions
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15
drivers/cpufreq/cpufreq.c
View File

@ -1731,6 +1731,21 @@ const char *cpufreq_get_current_driver(void)
} }
EXPORT_SYMBOL_GPL(cpufreq_get_current_driver); 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 * * NOTIFIER LISTS INTERFACE *
*********************************************************************/ *********************************************************************/

2
include/linux/cpufreq.h
View File

@ -219,6 +219,7 @@ __ATTR(_name, 0644, show_##_name, store_##_name)
struct cpufreq_driver { struct cpufreq_driver {
char name[CPUFREQ_NAME_LEN]; char name[CPUFREQ_NAME_LEN];
u8 flags; u8 flags;
void *driver_data;
/* needed by all drivers */ /* needed by all drivers */
int (*init) (struct cpufreq_policy *policy); 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); int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
const char *cpufreq_get_current_driver(void); const char *cpufreq_get_current_driver(void);
void *cpufreq_get_driver_data(void);
static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
unsigned int min, unsigned int max) unsigned int min, unsigned int max)