mirror of https://gitee.com/openkylin/linux.git
184 lines
4.5 KiB
C
184 lines
4.5 KiB
C
/*
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* extcon_gpio.c - Single-state GPIO extcon driver based on extcon class
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*
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* Copyright (C) 2008 Google, Inc.
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* Author: Mike Lockwood <lockwood@android.com>
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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.h>
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#include <linux/extcon/extcon-gpio.h>
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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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 *id_gpiod;
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struct gpio_extcon_pdata *pdata;
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};
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static void gpio_extcon_work(struct work_struct *work)
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{
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int state;
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struct gpio_extcon_data *data =
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container_of(to_delayed_work(work), struct gpio_extcon_data,
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work);
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state = gpiod_get_value_cansleep(data->id_gpiod);
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if (data->pdata->gpio_active_low)
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state = !state;
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extcon_set_state(data->edev, state);
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}
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static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
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{
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struct gpio_extcon_data *data = dev_id;
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queue_delayed_work(system_power_efficient_wq, &data->work,
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data->debounce_jiffies);
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return IRQ_HANDLED;
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}
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static int gpio_extcon_init(struct device *dev, struct gpio_extcon_data *data)
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{
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struct gpio_extcon_pdata *pdata = data->pdata;
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int ret;
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ret = devm_gpio_request_one(dev, pdata->gpio, GPIOF_DIR_IN,
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dev_name(dev));
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if (ret < 0)
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return ret;
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data->id_gpiod = gpio_to_desc(pdata->gpio);
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if (!data->id_gpiod)
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return -EINVAL;
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if (pdata->debounce) {
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ret = gpiod_set_debounce(data->id_gpiod,
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pdata->debounce * 1000);
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if (ret < 0)
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data->debounce_jiffies =
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msecs_to_jiffies(pdata->debounce);
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}
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data->irq = gpiod_to_irq(data->id_gpiod);
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if (data->irq < 0)
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return data->irq;
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return 0;
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}
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static int gpio_extcon_probe(struct platform_device *pdev)
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{
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struct gpio_extcon_pdata *pdata = dev_get_platdata(&pdev->dev);
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struct gpio_extcon_data *data;
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int ret;
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if (!pdata)
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return -EBUSY;
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if (!pdata->irq_flags || pdata->extcon_id > EXTCON_NONE)
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return -EINVAL;
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data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data),
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GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->pdata = pdata;
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/* Initialize the gpio */
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ret = gpio_extcon_init(&pdev->dev, data);
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if (ret < 0)
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return ret;
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/* Allocate the memory of extcon devie and register extcon device */
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data->edev = devm_extcon_dev_allocate(&pdev->dev, &pdata->extcon_id);
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if (IS_ERR(data->edev)) {
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dev_err(&pdev->dev, "failed to allocate extcon device\n");
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return -ENOMEM;
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}
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ret = devm_extcon_dev_register(&pdev->dev, data->edev);
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if (ret < 0)
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return ret;
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INIT_DELAYED_WORK(&data->work, gpio_extcon_work);
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/*
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* Request the interrput 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(&pdev->dev, data->irq,
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gpio_irq_handler, pdata->irq_flags,
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pdev->name, data);
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if (ret < 0)
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return ret;
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platform_set_drvdata(pdev, data);
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/* Perform initial detection */
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gpio_extcon_work(&data->work.work);
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return 0;
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}
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static int gpio_extcon_remove(struct platform_device *pdev)
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{
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struct gpio_extcon_data *data = platform_get_drvdata(pdev);
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cancel_delayed_work_sync(&data->work);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int gpio_extcon_resume(struct device *dev)
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{
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struct gpio_extcon_data *data;
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data = dev_get_drvdata(dev);
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if (data->pdata->check_on_resume)
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queue_delayed_work(system_power_efficient_wq,
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&data->work, data->debounce_jiffies);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(gpio_extcon_pm_ops, NULL, gpio_extcon_resume);
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static struct platform_driver gpio_extcon_driver = {
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.probe = gpio_extcon_probe,
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.remove = gpio_extcon_remove,
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.driver = {
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.name = "extcon-gpio",
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.pm = &gpio_extcon_pm_ops,
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},
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};
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module_platform_driver(gpio_extcon_driver);
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MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
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MODULE_DESCRIPTION("GPIO extcon driver");
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MODULE_LICENSE("GPL");
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