From f9004dbfff8a3fbbd7e2a88c8a4327c7f2f8e5b2 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 31 Jan 2024 01:04:47 +0000
Subject: [PATCH] add driver 5G
---
kernel/drivers/extcon/extcon-gpio.c | 39 ++++++++++++++++++++-------------------
1 files changed, 20 insertions(+), 19 deletions(-)
diff --git a/kernel/drivers/extcon/extcon-gpio.c b/kernel/drivers/extcon/extcon-gpio.c
index 13ba3a6..c211222 100644
--- a/kernel/drivers/extcon/extcon-gpio.c
+++ b/kernel/drivers/extcon/extcon-gpio.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* extcon_gpio.c - Single-state GPIO extcon driver based on extcon class
*
@@ -6,15 +7,6 @@
*
* Modified by MyungJoo Ham <myungjoo.ham@samsung.com> to support extcon
* (originally switch class is supported)
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
*/
#include <linux/extcon-provider.h>
@@ -30,26 +22,22 @@
/**
* struct gpio_extcon_data - A simple GPIO-controlled extcon device state container.
* @edev: Extcon device.
- * @irq: Interrupt line for the external connector.
* @work: Work fired by the interrupt.
* @debounce_jiffies: Number of jiffies to wait for the GPIO to stabilize, from the debounce
* value.
* @gpiod: GPIO descriptor for this external connector.
* @extcon_id: The unique id of specific external connector.
* @debounce: Debounce time for GPIO IRQ in ms.
- * @irq_flags: IRQ Flags (e.g., IRQF_TRIGGER_LOW).
* @check_on_resume: Boolean describing whether to check the state of gpio
* while resuming from sleep.
*/
struct gpio_extcon_data {
struct extcon_dev *edev;
- int irq;
struct delayed_work work;
unsigned long debounce_jiffies;
struct gpio_desc *gpiod;
unsigned int extcon_id;
unsigned long debounce;
- unsigned long irq_flags;
bool check_on_resume;
};
@@ -77,6 +65,8 @@
{
struct gpio_extcon_data *data;
struct device *dev = &pdev->dev;
+ unsigned long irq_flags;
+ int irq;
int ret;
data = devm_kzalloc(dev, sizeof(struct gpio_extcon_data), GFP_KERNEL);
@@ -90,15 +80,26 @@
* developed to get the extcon id from device-tree or others.
* On later, it have to be solved.
*/
- if (!data->irq_flags || data->extcon_id > EXTCON_NONE)
+ if (data->extcon_id > EXTCON_NONE)
return -EINVAL;
data->gpiod = devm_gpiod_get(dev, "extcon", GPIOD_IN);
if (IS_ERR(data->gpiod))
return PTR_ERR(data->gpiod);
- data->irq = gpiod_to_irq(data->gpiod);
- if (data->irq <= 0)
- return data->irq;
+ irq = gpiod_to_irq(data->gpiod);
+ if (irq <= 0)
+ return irq;
+
+ /*
+ * It is unlikely that this is an acknowledged interrupt that goes
+ * away after handling, what we are looking for are falling edges
+ * if the signal is active low, and rising edges if the signal is
+ * active high.
+ */
+ if (gpiod_is_active_low(data->gpiod))
+ irq_flags = IRQF_TRIGGER_FALLING;
+ else
+ irq_flags = IRQF_TRIGGER_RISING;
/* Allocate the memory of extcon devie and register extcon device */
data->edev = devm_extcon_dev_allocate(dev, &data->extcon_id);
@@ -117,8 +118,8 @@
* Request the interrupt of gpio to detect whether external connector
* is attached or detached.
*/
- ret = devm_request_any_context_irq(dev, data->irq,
- gpio_irq_handler, data->irq_flags,
+ ret = devm_request_any_context_irq(dev, irq,
+ gpio_irq_handler, irq_flags,
pdev->name, data);
if (ret < 0)
return ret;
--
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