[PATCH 28/44] x86: olpc: Register xo1 poweroff handler with kernel poweroff handler

[Guenter Roeck]

Register with kernel poweroff handler instead of setting pm_power_off
directly. Register with high priority value of 192 to reflect that
the driver explicitly wants to override default poweroff handlers.

Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: H. Peter Anvin <h...@zytor.com>
Signed-off-by: Guenter Roeck <li...@roeck-us.net>
---
 arch/x86/platform/olpc/olpc-xo1-pm.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/arch/x86/platform/olpc/olpc-xo1-pm.c 
b/arch/x86/platform/olpc/olpc-xo1-pm.c
index a9acde7..96fba36 100644
--- a/arch/x86/platform/olpc/olpc-xo1-pm.c
+++ b/arch/x86/platform/olpc/olpc-xo1-pm.c
@@ -15,6 +15,7 @@
 #include <linux/cs5535.h>
 #include <linux/platform_device.h>
 #include <linux/export.h>
+#include <linux/notifier.h>
 #include <linux/pm.h>
 #include <linux/mfd/core.h>
 #include <linux/suspend.h>
@@ -92,7 +93,8 @@ asmlinkage __visible int xo1_do_sleep(u8 sleep_state)
        return 0;
 }
 
-static void xo1_power_off(void)
+static int xo1_power_off(struct notifier_block *this, unsigned long unused1,
+                        void *unused2)
 {
        printk(KERN_INFO "OLPC XO-1 power off sequence...\n");
 
@@ -108,8 +110,15 @@ static void xo1_power_off(void)
 
        /* Write SLP_EN bit to start the machinery */
        outl(0x00002000, acpi_base + CS5536_PM1_CNT);
+
+       return NOTIFY_DONE;
 }
 
+static struct notifier_block xo1_poweroff_nb = {
+       .notifier_call = xo1_power_off,
+       .priority = 192,
+};
+
 static int xo1_power_state_valid(suspend_state_t pm_state)
 {
        /* suspend-to-RAM only */
@@ -146,8 +155,12 @@ static int xo1_pm_probe(struct platform_device *pdev)
 
        /* If we have both addresses, we can override the poweroff hook */
        if (pms_base && acpi_base) {
+               err = register_poweroff_handler(&xo1_poweroff_nb);
+               if (err) {
+                       dev_err(&pdev->dev, "Failed to register poweroff 
handler\n");
+                       return err;
+               }
                suspend_set_ops(&xo1_suspend_ops);
-               pm_power_off = xo1_power_off;
                printk(KERN_INFO "OLPC XO-1 support registered\n");
        }
 
@@ -158,12 +171,13 @@ static int xo1_pm_remove(struct platform_device *pdev)
 {
        mfd_cell_disable(pdev);
 
+       unregister_poweroff_handler(&xo1_poweroff_nb);
+
        if (strcmp(pdev->name, "cs5535-pms") == 0)
                pms_base = 0;
        else if (strcmp(pdev->name, "olpc-xo1-pm-acpi") == 0)
                acpi_base = 0;
 
-       pm_power_off = NULL;
        return 0;
 }
 
-- 
1.9.1

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