linux-kernel - [PATCH 2/3] ACPI / PM: Common string representations of device power states

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Date:	Wed, 05 Dec 2012 01:41:09 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Len Brown <lenb@...nel.org>
Subject: [PATCH 2/3] ACPI / PM: Common string representations of device power states

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

The function returning string representations of ACPI device power
states, state_string((), is now static, because it is only used
internally in drivers/acpi/bus.c.  However, it will be used outside
of that file going forward, so rename it to
acpi_power_state_string(), add a kerneldoc comment to it and add its
header to acpi_bus.h.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/acpi/bus.c      |   18 ++++++++++++------
 include/acpi/acpi_bus.h |    1 +
 2 files changed, 13 insertions(+), 6 deletions(-)

Index: linux/drivers/acpi/bus.c
===================================================================
--- linux.orig/drivers/acpi/bus.c
+++ linux/drivers/acpi/bus.c
@@ -182,7 +182,11 @@ EXPORT_SYMBOL(acpi_bus_get_private_data)
                                  Power Management
    -------------------------------------------------------------------------- */
 
-static const char *state_string(int state)
+/**
+ * acpi_power_state_string - String representation of ACPI device power state.
+ * @state: ACPI device power state to return the string representation of.
+ */
+const char *acpi_power_state_string(int state)
 {
 	switch (state) {
 	case ACPI_STATE_D0:
@@ -260,7 +264,7 @@ int acpi_device_get_power(struct acpi_de
 
  out:
 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
-			  device->pnp.bus_id, state_string(*state)));
+			  device->pnp.bus_id, acpi_power_state_string(*state)));
 
 	return 0;
 }
@@ -287,13 +291,13 @@ int acpi_device_set_power(struct acpi_de
 
 	if (state == device->power.state) {
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
-				  state_string(state)));
+				  acpi_power_state_string(state)));
 		return 0;
 	}
 
 	if (!device->power.states[state].flags.valid) {
 		printk(KERN_WARNING PREFIX "Device does not support %s\n",
-		       state_string(state));
+		       acpi_power_state_string(state));
 		return -ENODEV;
 	}
 	if (device->parent && (state < device->parent->power.state)) {
@@ -354,12 +358,14 @@ int acpi_device_set_power(struct acpi_de
 	if (result)
 		printk(KERN_WARNING PREFIX
 			      "Device [%s] failed to transition to %s\n",
-			      device->pnp.bus_id, state_string(state));
+			      device->pnp.bus_id,
+			      acpi_power_state_string(state));
 	else {
 		device->power.state = state;
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 				  "Device [%s] transitioned to %s\n",
-				  device->pnp.bus_id, state_string(state)));
+				  device->pnp.bus_id,
+				  acpi_power_state_string(state)));
 	}
 
 	return result;
Index: linux/include/acpi/acpi_bus.h
===================================================================
--- linux.orig/include/acpi/acpi_bus.h
+++ linux/include/acpi/acpi_bus.h
@@ -340,6 +340,7 @@ acpi_status acpi_bus_get_status_handle(a
 				       unsigned long long *sta);
 int acpi_bus_get_status(struct acpi_device *device);
 int acpi_bus_set_power(acpi_handle handle, int state);
+const char *acpi_power_state_string(int state);
 int acpi_device_get_power(struct acpi_device *device, int *state);
 int acpi_device_set_power(struct acpi_device *device, int state);
 int acpi_bus_update_power(acpi_handle handle, int *state_p);

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