diff options
Diffstat (limited to 'drivers/extcon/extcon_gpio.c')
| -rw-r--r-- | drivers/extcon/extcon_gpio.c | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/drivers/extcon/extcon_gpio.c b/drivers/extcon/extcon_gpio.c deleted file mode 100644 index 3cc152e690b..00000000000 --- a/drivers/extcon/extcon_gpio.c +++ /dev/null @@ -1,165 +0,0 @@ -/* - * drivers/extcon/extcon_gpio.c - * - * Single-state GPIO extcon driver based on extcon class - * - * Copyright (C) 2008 Google, Inc. - * Author: Mike Lockwood <lockwood@android.com> - * - * 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/module.h> -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/extcon.h> -#include <linux/workqueue.h> -#include <linux/gpio.h> -#include <linux/extcon.h> -#include <linux/extcon/extcon_gpio.h> - -struct gpio_extcon_data { - struct extcon_dev edev; - unsigned gpio; - const char *state_on; - const char *state_off; - int irq; - struct delayed_work work; - unsigned long debounce_jiffies; -}; - -static void gpio_extcon_work(struct work_struct *work) -{ - int state; - struct gpio_extcon_data *data = - container_of(to_delayed_work(work), struct gpio_extcon_data, - work); - - state = gpio_get_value(data->gpio); - extcon_set_state(&data->edev, state); -} - -static irqreturn_t gpio_irq_handler(int irq, void *dev_id) -{ - struct gpio_extcon_data *extcon_data = dev_id; - - schedule_delayed_work(&extcon_data->work, - extcon_data->debounce_jiffies); - return IRQ_HANDLED; -} - -static ssize_t extcon_gpio_print_state(struct extcon_dev *edev, char *buf) -{ - struct gpio_extcon_data *extcon_data = - container_of(edev, struct gpio_extcon_data, edev); - const char *state; - if (extcon_get_state(edev)) - state = extcon_data->state_on; - else - state = extcon_data->state_off; - - if (state) - return sprintf(buf, "%s\n", state); - return -EINVAL; -} - -static int __devinit gpio_extcon_probe(struct platform_device *pdev) -{ - struct gpio_extcon_platform_data *pdata = pdev->dev.platform_data; - struct gpio_extcon_data *extcon_data; - int ret = 0; - - if (!pdata) - return -EBUSY; - if (!pdata->irq_flags) { - dev_err(&pdev->dev, "IRQ flag is not specified.\n"); - return -EINVAL; - } - - extcon_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data), - GFP_KERNEL); - if (!extcon_data) - return -ENOMEM; - - extcon_data->edev.name = pdata->name; - extcon_data->gpio = pdata->gpio; - extcon_data->state_on = pdata->state_on; - extcon_data->state_off = pdata->state_off; - if (pdata->state_on && pdata->state_off) - extcon_data->edev.print_state = extcon_gpio_print_state; - extcon_data->debounce_jiffies = msecs_to_jiffies(pdata->debounce); - - ret = extcon_dev_register(&extcon_data->edev, &pdev->dev); - if (ret < 0) - return ret; - - ret = devm_gpio_request_one(&pdev->dev, extcon_data->gpio, GPIOF_DIR_IN, - pdev->name); - if (ret < 0) - goto err; - - INIT_DELAYED_WORK(&extcon_data->work, gpio_extcon_work); - - extcon_data->irq = gpio_to_irq(extcon_data->gpio); - if (extcon_data->irq < 0) { - ret = extcon_data->irq; - goto err; - } - - ret = request_any_context_irq(extcon_data->irq, gpio_irq_handler, - pdata->irq_flags, pdev->name, - extcon_data); - if (ret < 0) - goto err; - - platform_set_drvdata(pdev, extcon_data); - /* Perform initial detection */ - gpio_extcon_work(&extcon_data->work.work); - - return 0; - -err: - extcon_dev_unregister(&extcon_data->edev); - - return ret; -} - -static int __devexit gpio_extcon_remove(struct platform_device *pdev) -{ - struct gpio_extcon_data *extcon_data = platform_get_drvdata(pdev); - - cancel_delayed_work_sync(&extcon_data->work); - free_irq(extcon_data->irq, extcon_data); - extcon_dev_unregister(&extcon_data->edev); - - return 0; -} - -static struct platform_driver gpio_extcon_driver = { - .probe = gpio_extcon_probe, - .remove = __devexit_p(gpio_extcon_remove), - .driver = { - .name = "extcon-gpio", - .owner = THIS_MODULE, - }, -}; - -module_platform_driver(gpio_extcon_driver); - -MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); -MODULE_DESCRIPTION("GPIO extcon driver"); -MODULE_LICENSE("GPL"); |