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Power: gpio-poweroff: Fix documentation and gpio_is_valid

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Improve the documentation to clarify level vs edge triggered power off.
Improve the comments for level vs edge triggered power off.
Make use of gpio_is_valid().

Reported-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Andrew Lunn
2013-01-06 11:10:35 +01:00
committed by Jason Cooper
parent 53dfa8e4aa
commit 5343527bbf
2 changed files with 32 additions and 21 deletions
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33
drivers/power/reset/gpio-poweroff.c
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@@ -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 */
@@ -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) {
@@ -98,8 +96,7 @@ err:
static int __devexit 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;
@@ -115,15 +112,15 @@ static struct platform_driver gpio_poweroff_driver = {
.probe = gpio_poweroff_probe,
.remove = __devexit_p(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");