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: Stefan Eichenberger <stefan.eichenberger@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://lore.kernel.org/r/20231006130428.11259-2-francesco@dolcini.it
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Author: eichenberger

drivers/power/reset/gpio-poweroff.c

@@ -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;