Exactly like the cpuidle subsystem separates core cpuidle flags from
driver-specific cpuidle flags, this commit extends the cpufreq
subsystem with the same idea: the cpufreq_driver->flags field contain
the existing core cpufreq flags in the low 16 bits, and
driver-specific flags in the high 16 bits.
A new function called cpufreq_get_driver_flags() is added to allow a
cpufreq driver to retrieve those flags, 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@xxxxxxxxxxxxxxxxxx>
---
drivers/cpufreq/cpufreq.c | 15 +++++++++++++++
include/linux/cpufreq.h | 5 ++++-
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index d9fdedd..e41b971 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1728,6 +1728,21 @@ const char *cpufreq_get_current_driver(void)
}
EXPORT_SYMBOL_GPL(cpufreq_get_current_driver);
+/**
+ * cpufreq_get_driver_flags - return current driver's flags
+ *
+ * Return the flags of the currently loaded cpufreq driver, or 0
+ * if none.
+ */
+unsigned int cpufreq_get_driver_flags(void)
+{
+ if (cpufreq_driver)
+ return cpufreq_driver->flags & CPUFREQ_DRIVER_FLAGS_MASK;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cpufreq_get_driver_flags);
+
/*********************************************************************
* NOTIFIER LISTS INTERFACE *
*********************************************************************/
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 138336b..fa35601 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -218,7 +218,7 @@ __ATTR(_name, 0644, show_##_name, store_##_name)
struct cpufreq_driver {
char name[CPUFREQ_NAME_LEN];
- u8 flags;
+ unsigned int flags;
/* needed by all drivers */
int (*init) (struct cpufreq_policy *policy);
@@ -308,10 +308,13 @@ struct cpufreq_driver {
*/
#define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5)
+#define CPUFREQ_DRIVER_FLAGS_MASK (0xFFFF0000)
+
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);
+unsigned int cpufreq_get_driver_flags(void);
static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
unsigned int min, unsigned int max)
--
2.0.0
--
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