[PATCH v5 30/48] x86: iris: Register with kernel power-off handler

Guenter Roeck
2014-11-06T16:51:56Z

directly. Register with high priority to reflect that the original code
overwrites existing power-off handlers.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
v5:
- Rebase to v3.18-rc3
v4:
- Do not use notifiers but internal functions and data structures to manage
the list of power-off handlers. Drop unused parameters from callbacks, and
make the power-off function type void
v3:
- Replace poweroff in all newly introduced variables and in text
with power_off or power-off as appropriate
- Replace POWEROFF_PRIORITY_xxx with POWER_OFF_PRIORITY_xxx
v2:
- Use define to specify poweroff handler priority
- Use devm_register_power_off_handler

arch/x86/platform/iris/iris.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/arch/x86/platform/iris/iris.c b/arch/x86/platform/iris/iris.c
index 4d171e8..7152814 100644
--- a/arch/x86/platform/iris/iris.c
+++ b/arch/x86/platform/iris/iris.c
@@ -47,15 +47,18 @@ static bool force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Set to one to force poweroff handler installation.");

-static void (*old_pm_power_off)(void);
-
-static void iris_power_off(void)
+static void iris_power_off(struct power_off_handler_block *this)
{
outb(IRIS_GIO_PULSE, IRIS_GIO_OUTPUT);
msleep(850);
outb(IRIS_GIO_REST, IRIS_GIO_OUTPUT);
}

+static struct power_off_handler_block iris_power_off_hb = {
+ .handler = iris_power_off,
+ .priority = POWER_OFF_PRIORITY_HIGH,
+};
+
/*
* Before installing the power_off handler, try to make sure the OS is
* running on an Iris. Since Iris does not support DMI, this is done
@@ -65,20 +68,25 @@ static void iris_power_off(void)
static int iris_probe(struct platform_device *pdev)
{
unsigned char status = inb(IRIS_GIO_INPUT);
+ int ret;
+
if (status == IRIS_GIO_NODEV) {
printk(KERN_ERR "This machine does not seem to be an Iris. "
"Power off handler not installed.\n");
return -ENODEV;
}
- old_pm_power_off = pm_power_off;
- pm_power_off = &iris_power_off;
+
+ ret = devm_register_power_off_handler(&pdev->dev, &iris_power_off_hb);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to register power-off handler\n");
+ return ret;
+ }
printk(KERN_INFO "Iris power_off handler installed.\n");
return 0;
}

static int iris_remove(struct platform_device *pdev)
{
- pm_power_off = old_pm_power_off;
printk(KERN_INFO "Iris power_off handler uninstalled.\n");
return 0;
}
--
1.9.1