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authorLinus Walleij <linus.walleij@linaro.org>2014-07-07 12:34:32 +0200
committerSebastian Reichel <sre@kernel.org>2014-07-18 23:40:23 +0200
commit86336ba4b7daa8fa71be71b8d5f8e13de526f315 (patch)
treee36ef17120a3c3875320ad041cce4b3c99f8cffc /drivers/power
parent3dd843e1c26a023dc8d776e5d984c635c642785f (diff)
downloadop-kernel-dev-86336ba4b7daa8fa71be71b8d5f8e13de526f315.zip
op-kernel-dev-86336ba4b7daa8fa71be71b8d5f8e13de526f315.tar.gz
power: poweroff: gpio: convert to use descriptors
This switches the GPIO poweroff driver to use GPIO descriptors rather than numeral GPIOs. We get rid of the specific inversion handling as GPIO descriptors know if they are active low or high and can assert the line properly, so we do not need to check the flag OF_GPIO_ACTIVE_LOW returned from the old call of_get_gpio_flags() anymore. Also convert to use managed resources and use dev_* message printing while we're at it. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/reset/gpio-poweroff.c52
1 files changed, 19 insertions, 33 deletions
diff --git a/drivers/power/reset/gpio-poweroff.c b/drivers/power/reset/gpio-poweroff.c
index e290d48..ce849bc 100644
--- a/drivers/power/reset/gpio-poweroff.c
+++ b/drivers/power/reset/gpio-poweroff.c
@@ -15,31 +15,29 @@
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/of_platform.h>
-#include <linux/of_gpio.h>
#include <linux/module.h>
/*
* Hold configuration here, cannot be more than one instance of the driver
* since pm_power_off itself is global.
*/
-static int gpio_num = -1;
-static int gpio_active_low;
+static struct gpio_desc *reset_gpio;
static void gpio_poweroff_do_poweroff(void)
{
- BUG_ON(!gpio_is_valid(gpio_num));
+ BUG_ON(!reset_gpio);
/* drive it active, also inactive->active edge */
- gpio_direction_output(gpio_num, !gpio_active_low);
+ gpiod_direction_output(reset_gpio, 1);
mdelay(100);
/* drive inactive, also active->inactive edge */
- gpio_set_value(gpio_num, gpio_active_low);
+ gpiod_set_value(reset_gpio, 0);
mdelay(100);
/* drive it active, also inactive->active edge */
- gpio_set_value(gpio_num, !gpio_active_low);
+ gpiod_set_value(reset_gpio, 1);
/* give it some time */
mdelay(3000);
@@ -49,54 +47,42 @@ static void gpio_poweroff_do_poweroff(void)
static int gpio_poweroff_probe(struct platform_device *pdev)
{
- enum of_gpio_flags flags;
bool input = false;
- int ret;
/* If a pm_power_off function has already been added, leave it alone */
if (pm_power_off != NULL) {
- pr_err("%s: pm_power_off function already registered",
+ dev_err(&pdev->dev,
+ "%s: pm_power_off function already registered",
__func__);
return -EBUSY;
}
- gpio_num = of_get_gpio_flags(pdev->dev.of_node, 0, &flags);
- if (!gpio_is_valid(gpio_num))
- return gpio_num;
-
- gpio_active_low = flags & OF_GPIO_ACTIVE_LOW;
+ reset_gpio = devm_gpiod_get(&pdev->dev, NULL);
+ if (IS_ERR(reset_gpio))
+ return PTR_ERR(reset_gpio);
input = of_property_read_bool(pdev->dev.of_node, "input");
- ret = gpio_request(gpio_num, "poweroff-gpio");
- if (ret) {
- pr_err("%s: Could not get GPIO %d", __func__, gpio_num);
- return ret;
- }
if (input) {
- if (gpio_direction_input(gpio_num)) {
- pr_err("Could not set direction of GPIO %d to input",
- gpio_num);
- goto err;
+ if (gpiod_direction_input(reset_gpio)) {
+ dev_err(&pdev->dev,
+ "Could not set direction of reset GPIO to input\n");
+ return -ENODEV;
}
} else {
- if (gpio_direction_output(gpio_num, gpio_active_low)) {
- pr_err("Could not set direction of GPIO %d", gpio_num);
- goto err;
+ if (gpiod_direction_output(reset_gpio, 0)) {
+ dev_err(&pdev->dev,
+ "Could not set direction of reset GPIO\n");
+ return -ENODEV;
}
}
pm_power_off = &gpio_poweroff_do_poweroff;
return 0;
-
-err:
- gpio_free(gpio_num);
- return -ENODEV;
}
static int gpio_poweroff_remove(struct platform_device *pdev)
{
- gpio_free(gpio_num);
if (pm_power_off == &gpio_poweroff_do_poweroff)
pm_power_off = NULL;
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