cpufreq (6/7): allow cpufreq drivers to export sysfs files

diff -ru linux-original/arch/i386/kernel/cpu/cpufreq/p4-clockmod.c linux/arch/i386/kernel/cpu/cpufreq/p4-clockmod.c
@@ -214,6 +214,7 @@
 		else
 			p4clockmod_table[i].frequency = (stock_freq * i)/8;
 	}
+	cpufreq_frequency_table_get_attr(p4clockmod_table, policy->cpu);
 	
 	/* cpuinfo and default policy values */
 	policy->policy = CPUFREQ_POLICY_PERFORMANCE;

@@ -226,9 +227,14 @@
 
 static int cpufreq_p4_cpu_exit(struct cpufreq_policy *policy)
 {
+	cpufreq_frequency_table_put_attr(policy->cpu);    
 	return cpufreq_p4_setdc(policy->cpu, DC_DISABLE);
 }
 
+static struct freq_attr* p4clockmod_attr[] = {
+	&cpufreq_freq_attr_scaling_available_freqs,
+	NULL,
+};
 
 static struct cpufreq_driver p4clockmod_driver = {
 	.verify 	= cpufreq_p4_verify,

@@ -237,6 +243,7 @@
 	.exit		= cpufreq_p4_cpu_exit,
 	.name		= "p4-clockmod",
 	.owner		= THIS_MODULE,
+	.attr		= p4clockmod_attr,
 };
 
 

56 lines not on this page · raw message

diff -ru linux-original/include/linux/cpufreq.h linux/include/linux/cpufreq.h
@@ -152,6 +152,8 @@
 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
 
+struct freq_attr;
+
 struct cpufreq_driver {
 	/* needed by all drivers */
 	int	(*verify)	(struct cpufreq_policy *policy);

@@ -166,6 +168,7 @@
 	/* optional, for the moment */
 	int	(*init)		(struct cpufreq_policy *policy);
 	int	(*exit)		(struct cpufreq_policy *policy);
+	struct freq_attr	**attr;
 };
 
 int cpufreq_register_driver(struct cpufreq_driver *driver_data);

@@ -298,6 +301,15 @@
 				   unsigned int relation,
 				   unsigned int *index);
 
+/* the following are really really optional */
+extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
+
+void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table, 
+				      unsigned int cpu);
+
+void cpufreq_frequency_table_put_attr(unsigned int cpu);
+
+
 #endif /* CONFIG_CPU_FREQ_TABLE */
 
 #endif /* _LINUX_CPUFREQ_H */

diff -ru linux-original/kernel/cpufreq.c linux/kernel/cpufreq.c
@@ -340,6 +340,7 @@
 	int ret = 0;
 	struct cpufreq_policy new_policy;
 	struct cpufreq_policy *policy;
+	struct freq_attr **drv_attr;
 
 	if (!kset_get(&cpufreq_interface.kset))
 		return -EINVAL;

@@ -378,7 +379,13 @@
 	ret = kobject_register(&policy->kobj);
 	if (ret)
 		goto out;
-		
+
+	drv_attr = cpufreq_driver->attr;
+	while ((drv_attr) && (*drv_attr)) {
+		sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
+		drv_attr++;
+	}
+
 	/* set default policy */
 	ret = cpufreq_set_policy(&new_policy);
 	if (ret)