diff options
Diffstat (limited to 'drivers/power/reset/gpio-poweroff.c')
| -rw-r--r-- | drivers/power/reset/gpio-poweroff.c | 82 |
1 files changed, 44 insertions, 38 deletions
diff --git a/drivers/power/reset/gpio-poweroff.c b/drivers/power/reset/gpio-poweroff.c index b28f24da1b3c..52cfeee2cb28 100644 --- a/drivers/power/reset/gpio-poweroff.c +++ b/drivers/power/reset/gpio-poweroff.c @@ -15,50 +15,51 @@ #include <linux/gpio/consumer.h> #include <linux/mod_devicetable.h> #include <linux/module.h> +#include <linux/reboot.h> #define DEFAULT_TIMEOUT_MS 3000 -/* - * 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 void gpio_poweroff_do_poweroff(void) +struct gpio_poweroff { + struct gpio_desc *reset_gpio; + u32 timeout_ms; + u32 active_delay_ms; + u32 inactive_delay_ms; +}; + +static int gpio_poweroff_do_poweroff(struct sys_off_data *data) { - BUG_ON(!reset_gpio); + struct gpio_poweroff *gpio_poweroff = data->cb_data; /* 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); + + return NOTIFY_DONE; } static int gpio_poweroff_probe(struct platform_device *pdev) { + struct gpio_poweroff *gpio_poweroff; bool input = false; enum gpiod_flags flags; + int priority = SYS_OFF_PRIO_DEFAULT; + int ret; - /* 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; - } + 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) @@ -66,23 +67,29 @@ static int gpio_poweroff_probe(struct platform_device *pdev) 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; - pm_power_off = &gpio_poweroff_do_poweroff; - return 0; -} + 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); + device_property_read_u32(&pdev->dev, "priority", &priority); + if (priority > 255) { + dev_err(&pdev->dev, "Invalid priority property: %u\n", priority); + return -EINVAL; + } -static int gpio_poweroff_remove(struct platform_device *pdev) -{ - if (pm_power_off == &gpio_poweroff_do_poweroff) - pm_power_off = NULL; + 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); + + ret = devm_register_sys_off_handler(&pdev->dev, SYS_OFF_MODE_POWER_OFF, + priority, gpio_poweroff_do_poweroff, gpio_poweroff); + if (ret) + return dev_err_probe(&pdev->dev, ret, "Cannot register poweroff handler\n"); return 0; } @@ -95,7 +102,6 @@ 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, |