add driver 5G

hc

2024-01-31 f9004dbfff8a3fbbd7e2a88c8a4327c7f2f8e5b2

 kernel/drivers/extcon/extcon-gpio.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * extcon_gpio.c - Single-state GPIO extcon driver based on extcon class
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  *
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@@ -6,15 +7,6 @@
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  *
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  * Modified by MyungJoo Ham <myungjoo.ham@samsung.com> to support extcon
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  * (originally switch class is supported)
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- *
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- * This software is licensed under the terms of the GNU General Public
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- * License version 2, as published by the Free Software Foundation, and
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- * may be copied, distributed, and modified under those terms.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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  */
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 #include <linux/extcon-provider.h>
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@@ -30,26 +22,22 @@
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 /**
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  * struct gpio_extcon_data - A simple GPIO-controlled extcon device state container.
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  * @edev:		Extcon device.
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- * @irq:		Interrupt line for the external connector.
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  * @work:		Work fired by the interrupt.
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  * @debounce_jiffies:	Number of jiffies to wait for the GPIO to stabilize, from the debounce
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  *			value.
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  * @gpiod:		GPIO descriptor for this external connector.
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  * @extcon_id:		The unique id of specific external connector.
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  * @debounce:		Debounce time for GPIO IRQ in ms.
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- * @irq_flags:		IRQ Flags (e.g., IRQF_TRIGGER_LOW).
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  * @check_on_resume:	Boolean describing whether to check the state of gpio
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  *			while resuming from sleep.
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  */
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 struct gpio_extcon_data {
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 	struct extcon_dev *edev;
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-	int irq;
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 	struct delayed_work work;
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 	unsigned long debounce_jiffies;
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 	struct gpio_desc *gpiod;
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 	unsigned int extcon_id;
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 	unsigned long debounce;
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-	unsigned long irq_flags;
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 	bool check_on_resume;
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 };
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@@ -77,6 +65,8 @@
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 {
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 	struct gpio_extcon_data *data;
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 	struct device *dev = &pdev->dev;
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+	unsigned long irq_flags;
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+	int irq;
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 	int ret;
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 	data = devm_kzalloc(dev, sizeof(struct gpio_extcon_data), GFP_KERNEL);
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@@ -90,15 +80,26 @@
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 	 * developed to get the extcon id from device-tree or others.
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 	 * On later, it have to be solved.
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 	 */
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-	if (!data->irq_flags || data->extcon_id > EXTCON_NONE)
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+	if (data->extcon_id > EXTCON_NONE)
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 		return -EINVAL;
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 	data->gpiod = devm_gpiod_get(dev, "extcon", GPIOD_IN);
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 	if (IS_ERR(data->gpiod))
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 		return PTR_ERR(data->gpiod);
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-	data->irq = gpiod_to_irq(data->gpiod);
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-	if (data->irq <= 0)
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-		return data->irq;
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+	irq = gpiod_to_irq(data->gpiod);
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+	if (irq <= 0)
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+		return irq;
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+
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+	/*
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+	 * It is unlikely that this is an acknowledged interrupt that goes
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+	 * away after handling, what we are looking for are falling edges
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+	 * if the signal is active low, and rising edges if the signal is
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+	 * active high.
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+	 */
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+	if (gpiod_is_active_low(data->gpiod))
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+		irq_flags = IRQF_TRIGGER_FALLING;
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+	else
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+		irq_flags = IRQF_TRIGGER_RISING;
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 	/* Allocate the memory of extcon devie and register extcon device */
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 	data->edev = devm_extcon_dev_allocate(dev, &data->extcon_id);
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@@ -117,8 +118,8 @@
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 	 * Request the interrupt of gpio to detect whether external connector
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 	 * is attached or detached.
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 	 */
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-	ret = devm_request_any_context_irq(dev, data->irq,
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-					gpio_irq_handler, data->irq_flags,
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+	ret = devm_request_any_context_irq(dev, irq,
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+					gpio_irq_handler, irq_flags,
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 					pdev->name, data);
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 	if (ret < 0)
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 		return ret;