[CPUFREQ] cpufreq stat output in sysfs

From:  "Zou, Nanhai" <nanhai.zou@intel.com>

Export cpufreq transition information for drivers using the freq-table helpers
via sysfs.

Two minor updates from Dominik Brodowski:
s/translation/transition
Kconfig re-ordering
Signed-off-by: Dave Jones <davej@redhat.com>

drivers/cpufreq/Kconfig

@@ -27,6 +27,22 @@ config CPU_FREQ_DEBUG
 	       2 to activate CPUfreq drivers debugging, and
 	       4 to activate CPUfreq governor debugging
 
+config CPU_FREQ_STAT
+       tristate "CPU frequency translation statistics"
+       depends on CPU_FREQ && CPU_FREQ_TABLE
+       default y
+       help
+         This driver exports CPU frequency statistics information through sysfs
+         file system
+
+config CPU_FREQ_STAT_DETAILS
+       bool "CPU frequency translation statistics details"
+       depends on CPU_FREQ && CPU_FREQ_STAT
+       default n
+       help
+         This will show detail CPU frequency translation table in sysfs file
+         system
+
 config CPU_FREQ_PROC_INTF
 	tristate "/proc/cpufreq interface (deprecated)"
 	depends on CPU_FREQ && PROC_FS

drivers/cpufreq/Makefile

 # CPUfreq core
 obj-$(CONFIG_CPU_FREQ)			+= cpufreq.o
+# CPUfreq stats
+obj-$(CONFIG_CPU_FREQ_STAT)             += cpufreq_stats.o
 
 # CPUfreq governors 
 obj-$(CONFIG_CPU_FREQ_GOV_PERFORMANCE)	+= cpufreq_performance.o

drivers/cpufreq/cpufreq.c

@@ -63,7 +63,7 @@ static DECLARE_RWSEM		(cpufreq_notifier_rwsem);
 static LIST_HEAD(cpufreq_governor_list);
 static DECLARE_MUTEX		(cpufreq_governor_sem);
 
-static struct cpufreq_policy * cpufreq_cpu_get(unsigned int cpu)
+struct cpufreq_policy * cpufreq_cpu_get(unsigned int cpu)
 {
 	struct cpufreq_policy *data;
 	unsigned long flags;
@@ -102,12 +102,14 @@ static struct cpufreq_policy * cpufreq_cpu_get(unsigned int cpu)
  err_out:
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(cpufreq_cpu_get);
 
-static void cpufreq_cpu_put(struct cpufreq_policy *data)
+void cpufreq_cpu_put(struct cpufreq_policy *data)
 {
 	kobject_put(&data->kobj);
 	module_put(cpufreq_driver->owner);
 }
+EXPORT_SYMBOL_GPL(cpufreq_cpu_put);
 
 
 /*********************************************************************

drivers/cpufreq/freq_table.c

@@ -214,6 +214,11 @@ void cpufreq_frequency_table_put_attr(unsigned int cpu)
 }
 EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr);
 
+struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
+{
+	return show_table[cpu];
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);
 
 MODULE_AUTHOR ("Dominik Brodowski <linux@brodo.de>");
 MODULE_DESCRIPTION ("CPUfreq frequency table helpers");

include/linux/cpufreq.h

@@ -351,6 +351,11 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 				   unsigned int relation,
 				   unsigned int *index);
 
+/* the following 3 funtions are for cpufreq core use only */
+struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
+struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
+void   cpufreq_cpu_put (struct cpufreq_policy *data);
+
 /* the following are really really optional */
 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;