diff options
| author | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2014-10-19 11:30:27 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-10-21 00:51:01 +0200 |
| commit | 51315cdfa0521fff3059cec5fb8ffecc7f37cba7 (patch) | |
| tree | de84c1bf01703c640086afc019cdef697fe143b1 | |
| parent | f114040e3ea6e07372334ade75d1ee0775c355e1 (diff) | |
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: 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>
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 15 | ||||
| -rw-r--r-- | include/linux/cpufreq.h | 2 |
2 files changed, 17 insertions, 0 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 24bf76fba141..058d6e084a6d 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -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 * *********************************************************************/ diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 138336b6bb04..503b085b7832 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -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) |