ARM: Use struct syscore_ops instead of sysdevs for PM in common code
Convert some ARM architecture's common code to using
struct syscore_ops objects for power management instead of sysdev
classes and sysdevs.
This simplifies the code and reduces the kernel's memory footprint.
It also is necessary for removing sysdevs from the kernel entirely in
the future.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/arch/arm/kernel/leds.c b/arch/arm/kernel/leds.c
index 31a316c..0f107dc 100644
--- a/arch/arm/kernel/leds.c
+++ b/arch/arm/kernel/leds.c
@@ -10,6 +10,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
#include <asm/leds.h>
@@ -69,29 +70,8 @@
static SYSDEV_ATTR(event, 0200, NULL, leds_store);
-static int leds_suspend(struct sys_device *dev, pm_message_t state)
-{
- leds_event(led_stop);
- return 0;
-}
-
-static int leds_resume(struct sys_device *dev)
-{
- leds_event(led_start);
- return 0;
-}
-
-static int leds_shutdown(struct sys_device *dev)
-{
- leds_event(led_halted);
- return 0;
-}
-
static struct sysdev_class leds_sysclass = {
.name = "leds",
- .shutdown = leds_shutdown,
- .suspend = leds_suspend,
- .resume = leds_resume,
};
static struct sys_device leds_device = {
@@ -99,6 +79,28 @@
.cls = &leds_sysclass,
};
+static int leds_suspend(void)
+{
+ leds_event(led_stop);
+ return 0;
+}
+
+static void leds_resume(void)
+{
+ leds_event(led_start);
+}
+
+static void leds_shutdown(void)
+{
+ leds_event(led_halted);
+}
+
+static struct syscore_ops leds_syscore_ops = {
+ .shutdown = leds_shutdown,
+ .suspend = leds_suspend,
+ .resume = leds_resume,
+};
+
static int __init leds_init(void)
{
int ret;
@@ -107,6 +109,8 @@
ret = sysdev_register(&leds_device);
if (ret == 0)
ret = sysdev_create_file(&leds_device, &attr_event);
+ if (ret == 0)
+ register_syscore_ops(&leds_syscore_ops);
return ret;
}