Kernel/linux-next
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git synced 2025-01-07 14:32:23 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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>
This commit is contained in:
Stefan Eichenberger 2023-10-06 10:04:25 -03:00 committed by Sebastian Reichel
parent 3f26d8b6d1
commit 13b4c69646
1 changed files with 32 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
drivers/power/reset/gpio-poweroff.c
View File

@ -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);
device_property_read_u32(&pdev->dev, "inactive-delay-ms",
&inactive_delay);
device_property_read_u32(&pdev->dev, "timeout-ms", &timeout);
reset_gpio = devm_gpiod_get(&pdev->dev, NULL, flags);
if (IS_ERR(reset_gpio))
return PTR_ERR(reset_gpio);
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",
&gpio_poweroff->inactive_delay_ms);
device_property_read_u32(&pdev->dev, "timeout-ms", &gpio_poweroff->timeout_ms);
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;