[PATCH v2 29/47] power/reset: ltc2952-poweroff: Register with kernel poweroff handler

[Guenter Roeck]

Register with kernel poweroff handler instead of setting pm_power_off
directly. Register with low priority to reflect that the original code
sets pm_power_off only if it was not already set.

Signed-off-by: Guenter Roeck <li...@roeck-us.net>
---
v2: Added patch

 drivers/power/reset/ltc2952-poweroff.c | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/drivers/power/reset/ltc2952-poweroff.c 
b/drivers/power/reset/ltc2952-poweroff.c
index 116a1ce..da9abd2 100644
--- a/drivers/power/reset/ltc2952-poweroff.c
+++ b/drivers/power/reset/ltc2952-poweroff.c
@@ -80,6 +80,8 @@ struct ltc2952_poweroff_data {
         * 2: kill
         */
        struct gpio_desc *gpio[3];
+
+       struct notifier_block poweroff_nb;
 };
 
 static int ltc2952_poweroff_panic;
@@ -180,9 +182,13 @@ irq_ok:
        return IRQ_HANDLED;
 }
 
-static void ltc2952_poweroff_kill(void)
+static int ltc2952_poweroff_kill(struct notifier_block *this,
+                                unsigned long unused1, void *unused2)
+
 {
        gpiod_set_value(ltc2952_data->gpio[POWERPATH_IO_KILL], 1);
+
+       return NOTIFY_DONE;
 }
 
 static int ltc2952_poweroff_suspend(struct platform_device *pdev,
@@ -285,12 +291,7 @@ err_io:
 
 static int ltc2952_poweroff_probe(struct platform_device *pdev)
 {
-       int ret;
-
-       if (pm_power_off) {
-               dev_err(&pdev->dev, "pm_power_off already registered");
-               return -EBUSY;
-       }
+       int i, ret;
 
        ltc2952_data = kzalloc(sizeof(*ltc2952_data), GFP_KERNEL);
        if (!ltc2952_data)
@@ -302,12 +303,20 @@ static int ltc2952_poweroff_probe(struct platform_device 
*pdev)
        if (ret)
                goto err;
 
-       pm_power_off = &ltc2952_poweroff_kill;
+       ltc2952_data->poweroff_nb.notifier_call = ltc2952_poweroff_kill;
+       ltc2952_data->poweroff_nb.priority = POWEROFF_PRIORITY_LOW;
+       ret = register_power_off_handler(&ltc2952_data->poweroff_nb);
+       if (ret)
+               goto err_power;
 
        dev_info(&pdev->dev, "probe successful\n");
 
        return 0;
 
+err_power:
+       free_irq(ltc2952_data->virq, ltc2952_data);
+       for (i = 0; i < ARRAY_SIZE(ltc2952_data->gpio); i++)
+               gpiod_put(ltc2952_data->gpio[i]);
 err:
        kfree(ltc2952_data);
        return ret;
@@ -317,7 +326,7 @@ static int ltc2952_poweroff_remove(struct platform_device 
*pdev)
 {
        unsigned int i;
 
-       pm_power_off = NULL;
+       unregister_power_off_handler(&ltc2952_data->poweroff_nb);
 
        if (ltc2952_data) {
                free_irq(ltc2952_data->virq, ltc2952_data);
-- 
1.9.1

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