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Merge branch 'cpu_cooling-doc-comments-update' of .git into next

This commit is contained in:
Zhang Rui 2013-04-27 09:28:56 +08:00
parent 09681dfa55 d44ada5162
commit 8f578bfefd
2 changed files with 37 additions and 29 deletions
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50
drivers/thermal/cpu_cooling.c
View File

@ -64,6 +64,11 @@ static struct cpufreq_cooling_device *notify_device;
* get_idr - function to get a unique id. * get_idr - function to get a unique id.
* @idr: struct idr * handle used to create a id. * @idr: struct idr * handle used to create a id.
* @id: int * value generated by this function. * @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) 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)) if (unlikely(ret < 0))
return ret; return ret;
*id = ret; *id = ret;
return 0; return 0;
} }
@ -105,6 +111,7 @@ static void release_idr(struct idr *idr, int id)
static int is_cpufreq_valid(int cpu) static int is_cpufreq_valid(int cpu)
{ {
struct cpufreq_policy policy; struct cpufreq_policy policy;
return !cpufreq_get_policy(&policy, cpu); return !cpufreq_get_policy(&policy, cpu);
} }
@ -134,7 +141,8 @@ enum cpufreq_cooling_property {
* Return: 0 on success, -EINVAL when invalid parameters are passed. * Return: 0 on success, -EINVAL when invalid parameters are passed.
*/ */
static int get_property(unsigned int cpu, unsigned long input, 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; int i, j;
unsigned long max_level = 0, level = 0; unsigned long max_level = 0, level = 0;
@ -142,14 +150,13 @@ static int get_property(unsigned int cpu, unsigned long input,
int descend = -1; int descend = -1;
struct cpufreq_frequency_table *table = struct cpufreq_frequency_table *table =
cpufreq_frequency_get_table(cpu); cpufreq_frequency_get_table(cpu);
if (!output) if (!output)
return -EINVAL; return -EINVAL;
if (!table) if (!table)
return -EINVAL; return -EINVAL;
for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
/* ignore invalid entries */ /* ignore invalid entries */
if (table[i].frequency == CPUFREQ_ENTRY_INVALID) 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) 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++) { for (i = 0, j = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
/* ignore invalid entry */ /* ignore invalid entry */
@ -201,6 +207,7 @@ static int get_property(unsigned int cpu, unsigned long input,
} }
j++; j++;
} }
return -EINVAL; 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)) if (get_property(cpu, (unsigned long)freq, &val, GET_LEVEL))
return THERMAL_CSTATE_INVALID; return THERMAL_CSTATE_INVALID;
return (unsigned long)val; return (unsigned long)val;
} }
EXPORT_SYMBOL_GPL(cpufreq_cooling_get_level); 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); ret = get_property(cpu, level, &freq, GET_FREQ);
if (ret) if (ret)
return 0; return 0;
return freq; return freq;
} }
@ -261,7 +270,7 @@ static unsigned int get_cpu_frequency(unsigned int cpu, unsigned long level)
* cooling state). * cooling state).
*/ */
static int cpufreq_apply_cooling(struct cpufreq_cooling_device *cpufreq_device, static int cpufreq_apply_cooling(struct cpufreq_cooling_device *cpufreq_device,
unsigned long cooling_state) unsigned long cooling_state)
{ {
unsigned int cpuid, clip_freq; unsigned int cpuid, clip_freq;
struct cpumask *mask = &cpufreq_device->allowed_cpus; 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) * Return: 0 (success)
*/ */
static int cpufreq_thermal_notifier(struct notifier_block *nb, static int cpufreq_thermal_notifier(struct notifier_block *nb,
unsigned long event, void *data) unsigned long event, void *data)
{ {
struct cpufreq_policy *policy = data; struct cpufreq_policy *policy = data;
unsigned long max_freq = 0; 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)) if (cpumask_test_cpu(policy->cpu, &notify_device->allowed_cpus))
max_freq = notify_device->cpufreq_val; max_freq = notify_device->cpufreq_val;
/* Never exceed user_policy.max*/ /* Never exceed user_policy.max */
if (max_freq > policy->user_policy.max) if (max_freq > policy->user_policy.max)
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; 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. * 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; struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
*state = cpufreq_device->cpufreq_state; *state = cpufreq_device->cpufreq_state;
return 0; return 0;
} }
@ -417,8 +425,8 @@ static struct notifier_block thermal_cpufreq_notifier_block = {
* Return: a valid struct thermal_cooling_device pointer on success, * Return: a valid struct thermal_cooling_device pointer on success,
* on failure, it returns a corresponding ERR_PTR(). * on failure, it returns a corresponding ERR_PTR().
*/ */
struct thermal_cooling_device *cpufreq_cooling_register( struct thermal_cooling_device *
const struct cpumask *clip_cpus) cpufreq_cooling_register(const struct cpumask *clip_cpus)
{ {
struct thermal_cooling_device *cool_dev; struct thermal_cooling_device *cool_dev;
struct cpufreq_cooling_device *cpufreq_dev = NULL; struct cpufreq_cooling_device *cpufreq_dev = NULL;
@ -427,9 +435,9 @@ struct thermal_cooling_device *cpufreq_cooling_register(
int ret = 0, i; int ret = 0, i;
struct cpufreq_policy policy; 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) { 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)) if (!cpufreq_get_policy(&policy, i))
continue; continue;
if (min == 0 && max == 0) { if (min == 0 && max == 0) {
@ -437,12 +445,12 @@ struct thermal_cooling_device *cpufreq_cooling_register(
max = policy.cpuinfo.max_freq; max = policy.cpuinfo.max_freq;
} else { } else {
if (min != policy.cpuinfo.min_freq || if (min != policy.cpuinfo.min_freq ||
max != policy.cpuinfo.max_freq) max != policy.cpuinfo.max_freq)
return ERR_PTR(-EINVAL); return ERR_PTR(-EINVAL);
} }
} }
cpufreq_dev = kzalloc(sizeof(struct cpufreq_cooling_device), cpufreq_dev = kzalloc(sizeof(struct cpufreq_cooling_device),
GFP_KERNEL); GFP_KERNEL);
if (!cpufreq_dev) if (!cpufreq_dev)
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
@ -458,7 +466,7 @@ struct thermal_cooling_device *cpufreq_cooling_register(
cpufreq_dev->id); cpufreq_dev->id);
cool_dev = thermal_cooling_device_register(dev_name, cpufreq_dev, cool_dev = thermal_cooling_device_register(dev_name, cpufreq_dev,
&cpufreq_cooling_ops); &cpufreq_cooling_ops);
if (!cool_dev) { if (!cool_dev) {
release_idr(&cpufreq_idr, cpufreq_dev->id); release_idr(&cpufreq_idr, cpufreq_dev->id);
kfree(cpufreq_dev); kfree(cpufreq_dev);
@ -471,10 +479,11 @@ struct thermal_cooling_device *cpufreq_cooling_register(
/* Register the notifier for first cpufreq cooling device */ /* Register the notifier for first cpufreq cooling device */
if (cpufreq_dev_count == 0) if (cpufreq_dev_count == 0)
cpufreq_register_notifier(&thermal_cpufreq_notifier_block, cpufreq_register_notifier(&thermal_cpufreq_notifier_block,
CPUFREQ_POLICY_NOTIFIER); CPUFREQ_POLICY_NOTIFIER);
cpufreq_dev_count++; cpufreq_dev_count++;
mutex_unlock(&cooling_cpufreq_lock); mutex_unlock(&cooling_cpufreq_lock);
return cool_dev; return cool_dev;
} }
EXPORT_SYMBOL_GPL(cpufreq_cooling_register); 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 */ /* Unregister the notifier for the last cpufreq cooling device */
if (cpufreq_dev_count == 0) if (cpufreq_dev_count == 0)
cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block, cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block,
CPUFREQ_POLICY_NOTIFIER); CPUFREQ_POLICY_NOTIFIER);
mutex_unlock(&cooling_cpufreq_lock); mutex_unlock(&cooling_cpufreq_lock);
thermal_cooling_device_unregister(cpufreq_dev->cool_dev); thermal_cooling_device_unregister(cpufreq_dev->cool_dev);

16
include/linux/cpu_cooling.h
View File

@ -32,8 +32,8 @@
* cpufreq_cooling_register - function to create cpufreq cooling device. * cpufreq_cooling_register - function to create cpufreq cooling device.
* @clip_cpus: cpumask of cpus where the frequency constraints will happen * @clip_cpus: cpumask of cpus where the frequency constraints will happen
*/ */
struct thermal_cooling_device *cpufreq_cooling_register( struct thermal_cooling_device *
const struct cpumask *clip_cpus); cpufreq_cooling_register(const struct cpumask *clip_cpus);
/** /**
* cpufreq_cooling_unregister - function to remove cpufreq cooling device. * cpufreq_cooling_unregister - function to remove cpufreq cooling device.
@ -43,18 +43,18 @@ void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev);
unsigned long cpufreq_cooling_get_level(unsigned int, unsigned int); unsigned long cpufreq_cooling_get_level(unsigned int, unsigned int);
#else /* !CONFIG_CPU_THERMAL */ #else /* !CONFIG_CPU_THERMAL */
static inline struct thermal_cooling_device *cpufreq_cooling_register( static inline struct thermal_cooling_device *
const struct cpumask *clip_cpus) cpufreq_cooling_register(const struct cpumask *clip_cpus)
{ {
return NULL; return NULL;
} }
static inline void cpufreq_cooling_unregister( static inline
struct thermal_cooling_device *cdev) void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
{ {
return; return;
} }
static inline unsigned long cpufreq_cooling_get_level(unsigned int, static inline
unsigned int) unsigned long cpufreq_cooling_get_level(unsigned int, unsigned int)
{ {
return THERMAL_CSTATE_INVALID; return THERMAL_CSTATE_INVALID;
} }