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authorZhang Rui <rui.zhang@intel.com>2013-04-27 09:28:56 +0800
committerZhang Rui <rui.zhang@intel.com>2013-04-27 09:28:56 +0800
commit8f578bfefdd13d28d5baf3345405c46b101fe2f5 (patch)
treebc5288ac0f07ba92943b48b8d490c7c5825a3fcd /drivers/thermal
parent09681dfa554743041a3dbd9ca87a320c908c37f4 (diff)
parentd44ada516277f5d58b9bda2ea0a2c9503b316bbf (diff)
downloadvexpress-lsk-8f578bfefdd13d28d5baf3345405c46b101fe2f5.tar.gz
Merge branch 'cpu_cooling-doc-comments-update' of .git into next
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/cpu_cooling.c50
1 files changed, 29 insertions, 21 deletions
diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
index a294921be65..c94bf2e5de6 100644
--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -64,6 +64,11 @@ static struct cpufreq_cooling_device *notify_device;
* get_idr - function to get a unique id.
* @idr: struct idr * handle used to create a id.
* @id: int * value generated by this function.
+ *
+ * This function will populate @id with an unique
+ * id, using the idr API.
+ *
+ * Return: 0 on success, an error code on failure.
*/
static int get_idr(struct idr *idr, int *id)
{
@@ -75,6 +80,7 @@ static int get_idr(struct idr *idr, int *id)
if (unlikely(ret < 0))
return ret;
*id = ret;
+
return 0;
}
@@ -105,6 +111,7 @@ static void release_idr(struct idr *idr, int id)
static int is_cpufreq_valid(int cpu)
{
struct cpufreq_policy policy;
+
return !cpufreq_get_policy(&policy, cpu);
}
@@ -134,7 +141,8 @@ enum cpufreq_cooling_property {
* Return: 0 on success, -EINVAL when invalid parameters are passed.
*/
static int get_property(unsigned int cpu, unsigned long input,
- unsigned int* output, enum cpufreq_cooling_property property)
+ unsigned int *output,
+ enum cpufreq_cooling_property property)
{
int i, j;
unsigned long max_level = 0, level = 0;
@@ -142,14 +150,13 @@ static int get_property(unsigned int cpu, unsigned long input,
int descend = -1;
struct cpufreq_frequency_table *table =
cpufreq_frequency_get_table(cpu);
-
+
if (!output)
return -EINVAL;
if (!table)
return -EINVAL;
-
for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
/* ignore invalid entries */
if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
@@ -174,8 +181,7 @@ static int get_property(unsigned int cpu, unsigned long input,
}
if (property == GET_FREQ)
- level = descend ? input : (max_level - input -1);
-
+ level = descend ? input : (max_level - input - 1);
for (i = 0, j = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
/* ignore invalid entry */
@@ -201,6 +207,7 @@ static int get_property(unsigned int cpu, unsigned long input,
}
j++;
}
+
return -EINVAL;
}
@@ -221,6 +228,7 @@ unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq)
if (get_property(cpu, (unsigned long)freq, &val, GET_LEVEL))
return THERMAL_CSTATE_INVALID;
+
return (unsigned long)val;
}
EXPORT_SYMBOL_GPL(cpufreq_cooling_get_level);
@@ -245,6 +253,7 @@ static unsigned int get_cpu_frequency(unsigned int cpu, unsigned long level)
ret = get_property(cpu, level, &freq, GET_FREQ);
if (ret)
return 0;
+
return freq;
}
@@ -261,7 +270,7 @@ static unsigned int get_cpu_frequency(unsigned int cpu, unsigned long level)
* cooling state).
*/
static int cpufreq_apply_cooling(struct cpufreq_cooling_device *cpufreq_device,
- unsigned long cooling_state)
+ unsigned long cooling_state)
{
unsigned int cpuid, clip_freq;
struct cpumask *mask = &cpufreq_device->allowed_cpus;
@@ -303,7 +312,7 @@ static int cpufreq_apply_cooling(struct cpufreq_cooling_device *cpufreq_device,
* Return: 0 (success)
*/
static int cpufreq_thermal_notifier(struct notifier_block *nb,
- unsigned long event, void *data)
+ unsigned long event, void *data)
{
struct cpufreq_policy *policy = data;
unsigned long max_freq = 0;
@@ -314,7 +323,7 @@ static int cpufreq_thermal_notifier(struct notifier_block *nb,
if (cpumask_test_cpu(policy->cpu, &notify_device->allowed_cpus))
max_freq = notify_device->cpufreq_val;
- /* Never exceed user_policy.max*/
+ /* Never exceed user_policy.max */
if (max_freq > policy->user_policy.max)
max_freq = policy->user_policy.max;
@@ -324,9 +333,7 @@ static int cpufreq_thermal_notifier(struct notifier_block *nb,
return 0;
}
-/*
- * cpufreq cooling device callback functions are defined below
- */
+/* cpufreq cooling device callback functions are defined below */
/**
* cpufreq_get_max_state - callback function to get the max cooling state.
@@ -373,6 +380,7 @@ static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev,
struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
*state = cpufreq_device->cpufreq_state;
+
return 0;
}
@@ -417,8 +425,8 @@ static struct notifier_block thermal_cpufreq_notifier_block = {
* Return: a valid struct thermal_cooling_device pointer on success,
* on failure, it returns a corresponding ERR_PTR().
*/
-struct thermal_cooling_device *cpufreq_cooling_register(
- const struct cpumask *clip_cpus)
+struct thermal_cooling_device *
+cpufreq_cooling_register(const struct cpumask *clip_cpus)
{
struct thermal_cooling_device *cool_dev;
struct cpufreq_cooling_device *cpufreq_dev = NULL;
@@ -427,9 +435,9 @@ struct thermal_cooling_device *cpufreq_cooling_register(
int ret = 0, i;
struct cpufreq_policy policy;
- /*Verify that all the clip cpus have same freq_min, freq_max limit*/
+ /* Verify that all the clip cpus have same freq_min, freq_max limit */
for_each_cpu(i, clip_cpus) {
- /*continue if cpufreq policy not found and not return error*/
+ /* continue if cpufreq policy not found and not return error */
if (!cpufreq_get_policy(&policy, i))
continue;
if (min == 0 && max == 0) {
@@ -437,12 +445,12 @@ struct thermal_cooling_device *cpufreq_cooling_register(
max = policy.cpuinfo.max_freq;
} else {
if (min != policy.cpuinfo.min_freq ||
- max != policy.cpuinfo.max_freq)
+ max != policy.cpuinfo.max_freq)
return ERR_PTR(-EINVAL);
}
}
cpufreq_dev = kzalloc(sizeof(struct cpufreq_cooling_device),
- GFP_KERNEL);
+ GFP_KERNEL);
if (!cpufreq_dev)
return ERR_PTR(-ENOMEM);
@@ -458,7 +466,7 @@ struct thermal_cooling_device *cpufreq_cooling_register(
cpufreq_dev->id);
cool_dev = thermal_cooling_device_register(dev_name, cpufreq_dev,
- &cpufreq_cooling_ops);
+ &cpufreq_cooling_ops);
if (!cool_dev) {
release_idr(&cpufreq_idr, cpufreq_dev->id);
kfree(cpufreq_dev);
@@ -471,10 +479,11 @@ struct thermal_cooling_device *cpufreq_cooling_register(
/* Register the notifier for first cpufreq cooling device */
if (cpufreq_dev_count == 0)
cpufreq_register_notifier(&thermal_cpufreq_notifier_block,
- CPUFREQ_POLICY_NOTIFIER);
+ CPUFREQ_POLICY_NOTIFIER);
cpufreq_dev_count++;
mutex_unlock(&cooling_cpufreq_lock);
+
return cool_dev;
}
EXPORT_SYMBOL_GPL(cpufreq_cooling_register);
@@ -495,8 +504,7 @@ void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
/* Unregister the notifier for the last cpufreq cooling device */
if (cpufreq_dev_count == 0)
cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block,
- CPUFREQ_POLICY_NOTIFIER);
-
+ CPUFREQ_POLICY_NOTIFIER);
mutex_unlock(&cooling_cpufreq_lock);
thermal_cooling_device_unregister(cpufreq_dev->cool_dev);