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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 <[email protected]>
Acked-by: Viresh Kumar <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Thomas Petazzoni 2014-10-19 11:30:27 +02:00 • committed by Rafael J. Wysocki
commit 51315cdfa0
2 changed files with 17 additions and 0 deletions
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15
drivers/cpufreq/cpufreq.c
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@ -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 *
*********************************************************************/