1 // SPDX-License-Identifier: GPL-2.0-only
3  * extcon_gpio.c - Single-state GPIO extcon driver based on extcon class
12 #include <linux/devm-helpers.h>
13 #include <linux/extcon-provider.h>
24  * struct gpio_extcon_data - A simple GPIO-controlled extcon device state container.
29  * @gpiod:		GPIO descriptor for this external connector.
30  * @extcon_id:		The unique id of specific external connector.
52 	state = gpiod_get_value_cansleep(data->gpiod);  in gpio_extcon_work()
53 	extcon_set_state_sync(data->edev, data->extcon_id, state);  in gpio_extcon_work()
60 	queue_delayed_work(system_power_efficient_wq, &data->work,  in gpio_irq_handler()
61 			      data->debounce_jiffies);  in gpio_irq_handler()
68 	struct device *dev = &pdev->dev;  in gpio_extcon_probe()
75 		return -ENOMEM;  in gpio_extcon_probe()
78 	 * FIXME: extcon_id represents the unique identifier of external  in gpio_extcon_probe()
81 	 * developed to get the extcon id from device-tree or others.  in gpio_extcon_probe()
84 	if (data->extcon_id > EXTCON_NONE)  in gpio_extcon_probe()
85 		return -EINVAL;  in gpio_extcon_probe()
87 	data->gpiod = devm_gpiod_get(dev, "extcon", GPIOD_IN);  in gpio_extcon_probe()
88 	if (IS_ERR(data->gpiod))  in gpio_extcon_probe()
89 		return PTR_ERR(data->gpiod);  in gpio_extcon_probe()
90 	irq = gpiod_to_irq(data->gpiod);  in gpio_extcon_probe()
96 	 * away after handling, what we are looking for are falling edges  in gpio_extcon_probe()
100 	if (gpiod_is_active_low(data->gpiod))  in gpio_extcon_probe()
106 	data->edev = devm_extcon_dev_allocate(dev, &data->extcon_id);  in gpio_extcon_probe()
107 	if (IS_ERR(data->edev)) {  in gpio_extcon_probe()
109 		return -ENOMEM;  in gpio_extcon_probe()
112 	ret = devm_extcon_dev_register(dev, data->edev);  in gpio_extcon_probe()
116 	ret = devm_delayed_work_autocancel(dev, &data->work, gpio_extcon_work);  in gpio_extcon_probe()
121 	 * Request the interrupt of gpio to detect whether external connector  in gpio_extcon_probe()
126 					pdev->name, data);  in gpio_extcon_probe()
132 	gpio_extcon_work(&data->work.work);  in gpio_extcon_probe()
143 	if (data->check_on_resume)  in gpio_extcon_resume()
145 			&data->work, data->debounce_jiffies);  in gpio_extcon_resume()
156 		.name	= "extcon-gpio",