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path: root/drivers/power/reset/gpio-poweroff.c
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Diffstat (limited to 'drivers/power/reset/gpio-poweroff.c')
-rw-r--r--drivers/power/reset/gpio-poweroff.c39
1 files changed, 18 insertions, 21 deletions
diff --git a/drivers/power/reset/gpio-poweroff.c b/drivers/power/reset/gpio-poweroff.c
index 0491e5335d02..e290d48ddd99 100644
--- a/drivers/power/reset/gpio-poweroff.c
+++ b/drivers/power/reset/gpio-poweroff.c
@@ -29,15 +29,16 @@ static int gpio_active_low;
static void gpio_poweroff_do_poweroff(void)
{
- BUG_ON(gpio_num == -1);
+ BUG_ON(!gpio_is_valid(gpio_num));
- /* drive it active */
+ /* drive it active, also inactive->active edge */
gpio_direction_output(gpio_num, !gpio_active_low);
mdelay(100);
- /* rising edge or drive inactive */
+ /* drive inactive, also active->inactive edge */
gpio_set_value(gpio_num, gpio_active_low);
mdelay(100);
- /* falling edge */
+
+ /* drive it active, also inactive->active edge */
gpio_set_value(gpio_num, !gpio_active_low);
/* give it some time */
@@ -46,7 +47,7 @@ static void gpio_poweroff_do_poweroff(void)
WARN_ON(1);
}
-static int __devinit gpio_poweroff_probe(struct platform_device *pdev)
+static int gpio_poweroff_probe(struct platform_device *pdev)
{
enum of_gpio_flags flags;
bool input = false;
@@ -60,15 +61,12 @@ static int __devinit gpio_poweroff_probe(struct platform_device *pdev)
}
gpio_num = of_get_gpio_flags(pdev->dev.of_node, 0, &flags);
- if (gpio_num < 0) {
- pr_err("%s: Could not get GPIO configuration: %d",
- __func__, gpio_num);
- return -ENODEV;
- }
+ if (!gpio_is_valid(gpio_num))
+ return gpio_num;
+
gpio_active_low = flags & OF_GPIO_ACTIVE_LOW;
- if (of_get_property(pdev->dev.of_node, "input", NULL))
- input = true;
+ input = of_property_read_bool(pdev->dev.of_node, "input");
ret = gpio_request(gpio_num, "poweroff-gpio");
if (ret) {
@@ -96,10 +94,9 @@ err:
return -ENODEV;
}
-static int __devexit gpio_poweroff_remove(struct platform_device *pdev)
+static int gpio_poweroff_remove(struct platform_device *pdev)
{
- if (gpio_num != -1)
- gpio_free(gpio_num);
+ gpio_free(gpio_num);
if (pm_power_off == &gpio_poweroff_do_poweroff)
pm_power_off = NULL;
@@ -113,17 +110,17 @@ static const struct of_device_id of_gpio_poweroff_match[] = {
static struct platform_driver gpio_poweroff_driver = {
.probe = gpio_poweroff_probe,
- .remove = __devexit_p(gpio_poweroff_remove),
+ .remove = gpio_poweroff_remove,
.driver = {
- .name = "poweroff-gpio",
- .owner = THIS_MODULE,
- .of_match_table = of_gpio_poweroff_match,
- },
+ .name = "poweroff-gpio",
+ .owner = THIS_MODULE,
+ .of_match_table = of_gpio_poweroff_match,
+ },
};
module_platform_driver(gpio_poweroff_driver);
MODULE_AUTHOR("Jamie Lentin <jm@lentin.co.uk>");
MODULE_DESCRIPTION("GPIO poweroff driver");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:poweroff-gpio");