ARM / PXA: Use struct syscore_ops for "core" power management

Replace sysdev classes and struct sys_device objects used for "core"
power management by the PXA platform code with struct syscore_ops
objects that are simpler.

This reduces the code size and the kernel memory footprint.  It also
is necessary for removing sysdevs entirely from the kernel in the
future.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 8 insertions, 16 deletions

diff --git a/arch/arm/mach-pxa/palmz72.c b/arch/arm/mach-pxa/palmz72.c
index 3b8a4f3..65f24f0 100644
--- a/arch/arm/mach-pxa/palmz72.c
+++ b/arch/arm/mach-pxa/palmz72.c
@@ -19,7 +19,7 @@
  */
 
 #include <linux/platform_device.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/delay.h>
 #include <linux/irq.h>
 #include <linux/gpio_keys.h>
@@ -233,9 +233,9 @@ static struct palmz72_resume_info palmz72_resume_info = {
 
 static unsigned long store_ptr;
 
-/* sys_device for Palm Zire 72 PM */
+/* syscore_ops for Palm Zire 72 PM */
 
-static int palmz72_pm_suspend(struct sys_device *dev, pm_message_t msg)
+static int palmz72_pm_suspend(void)
 {
 	/* setup the resume_info struct for the original bootloader */
 	palmz72_resume_info.resume_addr = (u32) cpu_resume;
@@ -249,31 +249,23 @@ static int palmz72_pm_suspend(struct sys_device *dev, pm_message_t msg)
 	return 0;
 }
 
-static int palmz72_pm_resume(struct sys_device *dev)
+static void palmz72_pm_resume(void)
 {
 	*PALMZ72_SAVE_DWORD = store_ptr;
-	return 0;
 }
 
-static struct sysdev_class palmz72_pm_sysclass = {
-	.name = "palmz72_pm",
+static struct syscore_ops palmz72_pm_syscore_ops = {
 	.suspend = palmz72_pm_suspend,
 	.resume = palmz72_pm_resume,
 };
 
-static struct sys_device palmz72_pm_device = {
-	.cls = &palmz72_pm_sysclass,
-};
-
 static int __init palmz72_pm_init(void)
 {
-	int ret = -ENODEV;
 	if (machine_is_palmz72()) {
-		ret = sysdev_class_register(&palmz72_pm_sysclass);
-		if (ret == 0)
-			ret = sysdev_register(&palmz72_pm_device);
+		register_syscore_ops(&palmz72_pm_syscore_ops);
+		return 0;
 	}
-	return ret;
+	return -ENODEV;
 }
 
 device_initcall(palmz72_pm_init);