To maintain scalability let's add common methods to attach and detach
a PM domain for a device, dev_pm_domain_attach|detach().
Typically dev_pm_domain_attach() shall be invoked from subsystem level
code at the probe phase to try to attach a device to its PM domain.
The reversed actions may be done a the remove phase and then by invoking
dev_pm_domain_detach().
The supported PM domains at this point are the ACPI and the generic
PM domains.
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Tested-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
---
drivers/base/power/common.c | 56 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/pm.h | 14 ++++++++++++
2 files changed, 70 insertions(+)
diff --git a/drivers/base/power/common.c b/drivers/base/power/common.c
index df2e5ee..9a86b16 100644
--- a/drivers/base/power/common.c
+++ b/drivers/base/power/common.c
@@ -11,6 +11,8 @@
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/pm_clock.h>
+#include <linux/acpi.h>
+#include <linux/pm_domain.h>
/**
* dev_pm_get_subsys_data - Create or refcount power.subsys_data for device.
@@ -82,3 +84,57 @@ int dev_pm_put_subsys_data(struct device *dev)
return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_put_subsys_data);
+
+/**
+ * dev_pm_domain_attach - Attach a device to its PM domain.
+ * @dev: Device to attach.
+ * @power_on: Used to indicate whether we should power on the device.
+ *
+ * The @dev may only be attached to a single PM domain. By iterating through
+ * the available alternatives we try to find a valid PM domain for the device.
+ *
+ * This function should typically be invoked from subsystem level code during
+ * the probe phase. Especially for those that holds devices which requires
+ * power management through PM domains.
+ *
+ * Callers must ensure proper synchronization of this function with power
+ * management callbacks.
+ *
+ * Returns 0 on successfully attached PM domain or negative error code.
+ */
+int dev_pm_domain_attach(struct device *dev, bool power_on)
+{
+ int ret;
+
+ ret = acpi_dev_pm_attach(dev, power_on);
+ if (!ret || ret == -EPROBE_DEFER)
+ return ret;
+
+ return genpd_dev_pm_attach(dev);
+}
+EXPORT_SYMBOL_GPL(dev_pm_domain_attach);
+
+/**
+ * dev_pm_domain_detach - Detach a device from its PM domain.
+ * @dev: Device to attach.
+ * @power_off: Used to indicate whether we should power off the device.
+ *
+ * The @dev may be attached to a PM domain. By iterating through the available
+ * alternatives we detach it from its PM domain.
+ *
+ * This functions will reverse the actions from dev_pm_domain_attach() and thus
+ * detach the @dev from its PM domain. Typically it should be invoked from
+ * subsystem level code during the remove phase.
+ *
+ * Callers must ensure proper synchronization of this function with power
+ * management callbacks.
+ *
+ * Returns 0 on successfully detached PM domain or negative error code.
+ */
+int dev_pm_domain_detach(struct device *dev, bool power_off)
+{
+ if (acpi_dev_pm_detach(dev, power_off))
+ return genpd_dev_pm_detach(dev);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(dev_pm_domain_detach);
diff --git a/include/linux/pm.h b/include/linux/pm.h
index 72c0fe0..8176b07 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -621,6 +621,20 @@ struct dev_pm_domain {
struct dev_pm_ops ops;
};
+#ifdef CONFIG_PM
+extern int dev_pm_domain_attach(struct device *dev, bool power_on);
+extern int dev_pm_domain_detach(struct device *dev, bool power_off);
+#else
+static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
+{
+ return -ENODEV;
+}
+static inline int dev_pm_domain_detach(struct device *dev, bool power_off)
+{
+ return -ENODEV;
+}
+#endif
+
/*
* The PM_EVENT_ messages are also used by drivers implementing the legacy
* suspend framework, based on the ->suspend() and ->resume() callbacks common
--
1.9.1
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