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, 7 insertions, 16 deletions

diff --git a/arch/arm/mach-pxa/cm-x2xx.c b/arch/arm/mach-pxa/cm-x2xx.c
index 8225e2e58c6e..a10996782476 100644
--- a/arch/arm/mach-pxa/cm-x2xx.c
+++ b/arch/arm/mach-pxa/cm-x2xx.c
@@ -10,7 +10,7 @@
  */
 
 #include <linux/platform_device.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/irq.h>
 #include <linux/gpio.h>
 
@@ -388,7 +388,7 @@ static inline void cmx2xx_init_display(void) {}
 #ifdef CONFIG_PM
 static unsigned long sleep_save_msc[10];
 
-static int cmx2xx_suspend(struct sys_device *dev, pm_message_t state)
+static int cmx2xx_suspend(void)
 {
         cmx2xx_pci_suspend();
 
@@ -412,7 +412,7 @@ static int cmx2xx_suspend(struct sys_device *dev, pm_message_t state)
         return 0;
 }
 
-static int cmx2xx_resume(struct sys_device *dev)
+static void cmx2xx_resume(void)
 {
         cmx2xx_pci_resume();
 
@@ -420,27 +420,18 @@ static int cmx2xx_resume(struct sys_device *dev)
         __raw_writel(sleep_save_msc[0], MSC0);
         __raw_writel(sleep_save_msc[1], MSC1);
         __raw_writel(sleep_save_msc[2], MSC2);
-
-        return 0;
 }
 
-static struct sysdev_class cmx2xx_pm_sysclass = {
-        .name = "pm",
+static struct syscore_ops cmx2xx_pm_syscore_ops = {
         .resume = cmx2xx_resume,
         .suspend = cmx2xx_suspend,
 };
 
-static struct sys_device cmx2xx_pm_device = {
-        .cls = &cmx2xx_pm_sysclass,
-};
-
 static int __init cmx2xx_pm_init(void)
 {
-        int error;
-        error = sysdev_class_register(&cmx2xx_pm_sysclass);
-        if (error == 0)
-                error = sysdev_register(&cmx2xx_pm_device);
-        return error;
+        register_syscore_ops(&cmx2xx_pm_syscore_ops);
+
+        return 0;
 }
 #else
 static int __init cmx2xx_pm_init(void) { return 0; }