PM / AVR32: Use struct syscore_ops instead of sysdevs for PM

Convert some AVR32 architecture's 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>
Acked-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>

1 files changed, 12 insertions, 26 deletions

diff --git a/arch/avr32/mach-at32ap/intc.c b/arch/avr32/mach-at32ap/intc.c
index 21ce35f33aa5..3e3646186c9f 100644
--- a/arch/avr32/mach-at32ap/intc.c
+++ b/arch/avr32/mach-at32ap/intc.c
@@ -12,7 +12,7 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/platform_device.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 
 #include <asm/io.h>
 
@@ -21,7 +21,6 @@
 struct intc {
         void __iomem            *regs;
         struct irq_chip         chip;
-        struct sys_device       sysdev;
 #ifdef CONFIG_PM
         unsigned long           suspend_ipr;
         unsigned long           saved_ipr[64];
@@ -146,9 +145,8 @@ void intc_set_suspend_handler(unsigned long offset)
         intc0.suspend_ipr = offset;
 }
 
-static int intc_suspend(struct sys_device *sdev, pm_message_t state)
+static int intc_suspend(void)
 {
-        struct intc *intc = container_of(sdev, struct intc, sysdev);
         int i;
 
         if (unlikely(!irqs_disabled())) {
@@ -156,28 +154,25 @@ static int intc_suspend(struct sys_device *sdev, pm_message_t state)
                 return -EINVAL;
         }
 
-        if (unlikely(!intc->suspend_ipr)) {
+        if (unlikely(!intc0.suspend_ipr)) {
                 pr_err("intc_suspend: suspend_ipr not initialized\n");
                 return -EINVAL;
         }
 
         for (i = 0; i < 64; i++) {
-                intc->saved_ipr[i] = intc_readl(intc, INTPR0 + 4 * i);
-                intc_writel(intc, INTPR0 + 4 * i, intc->suspend_ipr);
+                intc0.saved_ipr[i] = intc_readl(&intc0, INTPR0 + 4 * i);
+                intc_writel(&intc0, INTPR0 + 4 * i, intc0.suspend_ipr);
         }
 
         return 0;
 }
 
-static int intc_resume(struct sys_device *sdev)
+static int intc_resume(void)
 {
-        struct intc *intc = container_of(sdev, struct intc, sysdev);
         int i;
 
-        WARN_ON(!irqs_disabled());
-
         for (i = 0; i < 64; i++)
-                intc_writel(intc, INTPR0 + 4 * i, intc->saved_ipr[i]);
+                intc_writel(&intc0, INTPR0 + 4 * i, intc0.saved_ipr[i]);
 
         return 0;
 }
@@ -186,27 +181,18 @@ static int intc_resume(struct sys_device *sdev)
 #define intc_resume     NULL
 #endif
 
-static struct sysdev_class intc_class = {
-        .name           = "intc",
+static struct syscore_ops intc_syscore_ops = {
         .suspend        = intc_suspend,
         .resume         = intc_resume,
 };
 
-static int __init intc_init_sysdev(void)
+static int __init intc_init_syscore(void)
 {
-        int ret;
-
-        ret = sysdev_class_register(&intc_class);
-        if (ret)
-                return ret;
+        register_syscore_ops(&intc_syscore_ops);
 
-        intc0.sysdev.id = 0;
-        intc0.sysdev.cls = &intc_class;
-        ret = sysdev_register(&intc0.sysdev);
-
-        return ret;
+        return 0;
 }
-device_initcall(intc_init_sysdev);
+device_initcall(intc_init_syscore);
 
 unsigned long intc_get_pending(unsigned int group)
 {