Commit 13b4c696 authored by Stefan Eichenberger's avatar Stefan Eichenberger Committed by Sebastian Reichel
Browse files

power: reset: gpio-poweroff: use a struct to store the module variables 



Use a struct to store the module variables. This is required to later
move to notifier_blocks where we can have several instances.

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/20231006130428.11259-2-francesco@dolcini.it


Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent 3f26d8b6

drivers/power/reset/gpio-poweroff.c

+31 −17
Original line number Diff line number Diff line
@@ -17,32 +17,37 @@ 
#include <linux/module.h>



#define DEFAULT_TIMEOUT_MS 3000



struct gpio_poweroff {

	struct gpio_desc *reset_gpio;

	u32 timeout_ms;

	u32 active_delay_ms;

	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_desc *reset_gpio;

static u32 timeout = DEFAULT_TIMEOUT_MS;

static u32 active_delay = 100;

static u32 inactive_delay = 100;

static struct gpio_poweroff *gpio_poweroff;



static void gpio_poweroff_do_poweroff(void)

{

	BUG_ON(!reset_gpio);

	BUG_ON(!gpio_poweroff);



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

	gpiod_direction_output(reset_gpio, 1);

	mdelay(active_delay);

	gpiod_direction_output(gpio_poweroff->reset_gpio, 1);

	mdelay(gpio_poweroff->active_delay_ms);



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

	gpiod_set_value_cansleep(reset_gpio, 0);

	mdelay(inactive_delay);

	gpiod_set_value_cansleep(gpio_poweroff->reset_gpio, 0);

	mdelay(gpio_poweroff->inactive_delay_ms);



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

	gpiod_set_value_cansleep(reset_gpio, 1);

	gpiod_set_value_cansleep(gpio_poweroff->reset_gpio, 1);



	/* give it some time */

	mdelay(timeout);

	mdelay(gpio_poweroff->timeout_ms);



	WARN_ON(1);

}
@@ -60,20 +65,29 @@ static int gpio_poweroff_probe(struct platform_device *pdev) 
		return -EBUSY;

	}



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

	if (!gpio_poweroff)

		return -ENOMEM;



	input = device_property_read_bool(&pdev->dev, "input");

	if (input)

		flags = GPIOD_IN;

	else

		flags = GPIOD_OUT_LOW;



	device_property_read_u32(&pdev->dev, "active-delay-ms", &active_delay);



	gpio_poweroff->active_delay_ms = 100;

	gpio_poweroff->inactive_delay_ms = 100;

	gpio_poweroff->timeout_ms = DEFAULT_TIMEOUT_MS;



	device_property_read_u32(&pdev->dev, "active-delay-ms", &gpio_poweroff->active_delay_ms);

	device_property_read_u32(&pdev->dev, "inactive-delay-ms",

				 &inactive_delay);

	device_property_read_u32(&pdev->dev, "timeout-ms", &timeout);

				 &gpio_poweroff->inactive_delay_ms);

	device_property_read_u32(&pdev->dev, "timeout-ms", &gpio_poweroff->timeout_ms);



	reset_gpio = devm_gpiod_get(&pdev->dev, NULL, flags);

	if (IS_ERR(reset_gpio))

		return PTR_ERR(reset_gpio);

	gpio_poweroff->reset_gpio = devm_gpiod_get(&pdev->dev, NULL, flags);

	if (IS_ERR(gpio_poweroff->reset_gpio))

		return PTR_ERR(gpio_poweroff->reset_gpio);



	pm_power_off = &gpio_poweroff_do_poweroff;

	return 0;