linux-kernel - [PATCH 5/13] ACPI / PM: Introduce function for refcounting device power resources

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Message-Id: <201011250006.55559.rjw@sisk.pl>
Date:	Thu, 25 Nov 2010 00:06:55 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Len Brown <lenb@...nel.org>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Maciej Rutecki <maciej.rutecki@...il.com>
Subject: [PATCH 5/13] ACPI / PM: Introduce function for refcounting device power resources

From: Rafael J. Wysocki <rjw@...k.pl>

Introduce function acpi_power_on_resources() that reference counts
and possibly turns on ACPI power resources for a given device and
a given power state of it.

This function will be used for reference counting device power
resources during initialization.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 drivers/acpi/internal.h |    1 +
 drivers/acpi/power.c    |    8 ++++++++
 2 files changed, 9 insertions(+)

Index: linux-2.6/drivers/acpi/power.c
===================================================================
--- linux-2.6.orig/drivers/acpi/power.c
+++ linux-2.6/drivers/acpi/power.c
@@ -485,6 +485,14 @@ int acpi_power_get_inferred_state(struct
 	return 0;
 }
 
+int acpi_power_on_resources(struct acpi_device *device, int state)
+{
+	if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
+		return -EINVAL;
+
+	return acpi_power_on_list(&device->power.states[state].resources);
+}
+
 int acpi_power_transition(struct acpi_device *device, int state)
 {
 	int result;
Index: linux-2.6/drivers/acpi/internal.h
===================================================================
--- linux-2.6.orig/drivers/acpi/internal.h
+++ linux-2.6/drivers/acpi/internal.h
@@ -42,6 +42,7 @@ int acpi_power_init(void);
 int acpi_device_sleep_wake(struct acpi_device *dev,
                            int enable, int sleep_state, int dev_state);
 int acpi_power_get_inferred_state(struct acpi_device *device, int *state);
+int acpi_power_on_resources(struct acpi_device *device, int state);
 int acpi_power_transition(struct acpi_device *device, int state);
 extern int acpi_power_nocheck;
 

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