Commit b16d9f49 authored by Stefan Eichenberger's avatar Stefan Eichenberger Committed by Sebastian Reichel
Browse files

power: reset: gpio-poweroff: use sys-off handler API 



Use the new sys-off handler API for gpio-poweroff. This allows us to
have more than one poweroff handler and prioritise them.

Signed-off-by: default avatarStefan Eichenberger <stefan.eichenberger@toradex.com>
Signed-off-by: default avatarFrancesco Dolcini <francesco.dolcini@toradex.com>
Link: https://lore.kernel.org/r/20231006130428.11259-3-francesco@dolcini.it


Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent 13b4c696

drivers/power/reset/gpio-poweroff.c

+12 −25
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/gpio/consumer.h>

#include <linux/mod_devicetable.h>

#include <linux/module.h>

#include <linux/reboot.h>



#define DEFAULT_TIMEOUT_MS 3000
@@ -25,15 +26,9 @@ struct gpio_poweroff { 
	u32 inactive_delay_ms;

};



/*

 * Hold configuration here, cannot be more than one instance of the driver

 * since pm_power_off itself is global.

 */

static struct gpio_poweroff *gpio_poweroff;



static void gpio_poweroff_do_poweroff(void)

static int gpio_poweroff_do_poweroff(struct sys_off_data *data)

{

	BUG_ON(!gpio_poweroff);

	struct gpio_poweroff *gpio_poweroff = data->cb_data;



	/* drive it active, also inactive->active edge */

	gpiod_direction_output(gpio_poweroff->reset_gpio, 1);
@@ -50,20 +45,16 @@ static void gpio_poweroff_do_poweroff(void) 
	mdelay(gpio_poweroff->timeout_ms);



	WARN_ON(1);



	return NOTIFY_DONE;

}



static int gpio_poweroff_probe(struct platform_device *pdev)

{

	struct gpio_poweroff *gpio_poweroff;

	bool input = false;

	enum gpiod_flags flags;



	/* If a pm_power_off function has already been added, leave it alone */

	if (pm_power_off != NULL) {

		dev_err(&pdev->dev,

			"%s: pm_power_off function already registered\n",

		       __func__);

		return -EBUSY;

	}

	int ret;



	gpio_poweroff = devm_kzalloc(&pdev->dev, sizeof(*gpio_poweroff), GFP_KERNEL);

	if (!gpio_poweroff)
@@ -89,14 +80,11 @@ static int gpio_poweroff_probe(struct platform_device *pdev) 
	if (IS_ERR(gpio_poweroff->reset_gpio))

		return PTR_ERR(gpio_poweroff->reset_gpio);



	pm_power_off = &gpio_poweroff_do_poweroff;

	return 0;

}



static int gpio_poweroff_remove(struct platform_device *pdev)

{

	if (pm_power_off == &gpio_poweroff_do_poweroff)

		pm_power_off = NULL;

	ret = devm_register_sys_off_handler(&pdev->dev, SYS_OFF_MODE_POWER_OFF,

					    SYS_OFF_PRIO_DEFAULT, gpio_poweroff_do_poweroff,

					    gpio_poweroff);

	if (ret)

		return dev_err_probe(&pdev->dev, ret, "Cannot register poweroff handler\n");



	return 0;

}
@@ -109,7 +97,6 @@ MODULE_DEVICE_TABLE(of, of_gpio_poweroff_match); 


static struct platform_driver gpio_poweroff_driver = {

	.probe = gpio_poweroff_probe,

	.remove = gpio_poweroff_remove,

	.driver = {

		.name = "poweroff-gpio",

		.of_match_table = of_gpio_poweroff_match,