PM / PowerPC: Use struct syscore_ops instead of sysdevs for PM

Make some PowerPC architecture's code use 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>

1 files changed, 11 insertions, 31 deletions

diff --git a/arch/powerpc/platforms/powermac/pic.c b/arch/powerpc/platforms/powermac/pic.c
index 023f24086a0a..7c18a1607d1c 100644
--- a/arch/powerpc/platforms/powermac/pic.c
+++ b/arch/powerpc/platforms/powermac/pic.c
@@ -21,7 +21,7 @@
 #include <linux/signal.h>
 #include <linux/pci.h>
 #include <linux/interrupt.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/adb.h>
 #include <linux/pmu.h>
 #include <linux/module.h>
@@ -677,7 +677,7 @@ not_found:
 	return viaint;
 }
 
-static int pmacpic_suspend(struct sys_device *sysdev, pm_message_t state)
+static int pmacpic_suspend(void)
 {
 	int viaint = pmacpic_find_viaint();
 
@@ -698,7 +698,7 @@ static int pmacpic_suspend(struct sys_device *sysdev, pm_message_t state)
         return 0;
 }
 
-static int pmacpic_resume(struct sys_device *sysdev)
+static void pmacpic_resume(void)
 {
 	int i;
 
@@ -709,39 +709,19 @@ static int pmacpic_resume(struct sys_device *sysdev)
 	for (i = 0; i < max_real_irqs; ++i)
 		if (test_bit(i, sleep_save_mask))
 			pmac_unmask_irq(irq_get_irq_data(i));
-
-	return 0;
 }
 
-#endif /* CONFIG_PM && CONFIG_PPC32 */
-
-static struct sysdev_class pmacpic_sysclass = {
-	.name = "pmac_pic",
+static struct syscore_ops pmacpic_syscore_ops = {
+	.suspend	= pmacpic_suspend,
+	.resume		= pmacpic_resume,
 };
 
-static struct sys_device device_pmacpic = {
-	.id		= 0,
-	.cls		= &pmacpic_sysclass,
-};
-
-static struct sysdev_driver driver_pmacpic = {
-#if defined(CONFIG_PM) && defined(CONFIG_PPC32)
-	.suspend	= &pmacpic_suspend,
-	.resume		= &pmacpic_resume,
-#endif /* CONFIG_PM && CONFIG_PPC32 */
-};
-
-static int __init init_pmacpic_sysfs(void)
+static int __init init_pmacpic_syscore(void)
 {
-#ifdef CONFIG_PPC32
-	if (max_irqs == 0)
-		return -ENODEV;
-#endif
-	printk(KERN_DEBUG "Registering pmac pic with sysfs...\n");
-	sysdev_class_register(&pmacpic_sysclass);
-	sysdev_register(&device_pmacpic);
-	sysdev_driver_register(&pmacpic_sysclass, &driver_pmacpic);
+	register_syscore_ops(&pmacpic_syscore_ops);
 	return 0;
 }
-machine_subsys_initcall(powermac, init_pmacpic_sysfs);
 
+machine_subsys_initcall(powermac, init_pmacpic_syscore);
+
+#endif /* CONFIG_PM && CONFIG_PPC32 */