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author | Chanwoo Choi <cw00.choi@samsung.com> | 2014-05-09 11:43:08 +0400 |
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committer | MyungJoo Ham <myungjoo.ham@samsung.com> | 2014-05-24 17:33:38 +0400 |
commit | 8cd84092d35e52372da2c3c3c2afb1a719917af2 (patch) | |
tree | ccb37cbe9e233257050288dbae74c6b3d914b55f /drivers/devfreq | |
parent | 585fc83ece43be63d5775e536f855db33dd752cf (diff) | |
download | linux-8cd84092d35e52372da2c3c3c2afb1a719917af2.tar.xz |
PM / devfreq: Add resource-managed function for devfreq device
This patch add resource-managed function for devfreq device as following
functions. The devm_devfreq_add_device() manages automatically the memory
of devfreq device using device resource management.
- devm_devfreq_add_device()
- devm_devfreq_remove_device()
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Diffstat (limited to 'drivers/devfreq')
-rw-r--r-- | drivers/devfreq/devfreq.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index af4af7708574..8b6295d9d1f5 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -544,6 +544,69 @@ int devfreq_remove_device(struct devfreq *devfreq) } EXPORT_SYMBOL(devfreq_remove_device); +static int devm_devfreq_dev_match(struct device *dev, void *res, void *data) +{ + struct devfreq **r = res; + + if (WARN_ON(!r || !*r)) + return 0; + + return *r == data; +} + +static void devm_devfreq_dev_release(struct device *dev, void *res) +{ + devfreq_remove_device(*(struct devfreq **)res); +} + +/** + * devm_devfreq_add_device() - Resource-managed devfreq_add_device() + * @dev: the device to add devfreq feature. + * @profile: device-specific profile to run devfreq. + * @governor_name: name of the policy to choose frequency. + * @data: private data for the governor. The devfreq framework does not + * touch this value. + * + * This function manages automatically the memory of devfreq device using device + * resource management and simplify the free operation for memory of devfreq + * device. + */ +struct devfreq *devm_devfreq_add_device(struct device *dev, + struct devfreq_dev_profile *profile, + const char *governor_name, + void *data) +{ + struct devfreq **ptr, *devfreq; + + ptr = devres_alloc(devm_devfreq_dev_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + devfreq = devfreq_add_device(dev, profile, governor_name, data); + if (IS_ERR(devfreq)) { + devres_free(ptr); + return ERR_PTR(-ENOMEM); + } + + *ptr = devfreq; + devres_add(dev, ptr); + + return devfreq; +} +EXPORT_SYMBOL(devm_devfreq_add_device); + +/** + * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device() + * @dev: the device to add devfreq feature. + * @devfreq: the devfreq instance to be removed + */ +void devm_devfreq_remove_device(struct device *dev, struct devfreq *devfreq) +{ + WARN_ON(devres_release(dev, devm_devfreq_dev_release, + devm_devfreq_dev_match, devfreq)); +} +EXPORT_SYMBOL(devm_devfreq_remove_device); + /** * devfreq_suspend_device() - Suspend devfreq of a device. * @devfreq: the devfreq instance to be suspended |