dm thin metadata: fix __udivdi3 undefined on 32-bit
[linux/fpc-iii.git] / drivers / extcon / extcon-gpio.c
blob279ff8f6637da8beb62cd92bbbe63b8759c896a6
1 /*
2 * extcon_gpio.c - Single-state GPIO extcon driver based on extcon class
4 * Copyright (C) 2008 Google, Inc.
5 * Author: Mike Lockwood <lockwood@android.com>
7 * Modified by MyungJoo Ham <myungjoo.ham@samsung.com> to support extcon
8 * (originally switch class is supported)
10 * This software is licensed under the terms of the GNU General Public
11 * License version 2, as published by the Free Software Foundation, and
12 * may be copied, distributed, and modified under those terms.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
20 #include <linux/extcon.h>
21 #include <linux/extcon/extcon-gpio.h>
22 #include <linux/gpio.h>
23 #include <linux/gpio/consumer.h>
24 #include <linux/init.h>
25 #include <linux/interrupt.h>
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/platform_device.h>
29 #include <linux/slab.h>
30 #include <linux/workqueue.h>
32 struct gpio_extcon_data {
33 struct extcon_dev *edev;
34 int irq;
35 struct delayed_work work;
36 unsigned long debounce_jiffies;
38 struct gpio_desc *id_gpiod;
39 struct gpio_extcon_pdata *pdata;
42 static void gpio_extcon_work(struct work_struct *work)
44 int state;
45 struct gpio_extcon_data *data =
46 container_of(to_delayed_work(work), struct gpio_extcon_data,
47 work);
49 state = gpiod_get_value_cansleep(data->id_gpiod);
50 if (data->pdata->gpio_active_low)
51 state = !state;
52 extcon_set_state(data->edev, state);
55 static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
57 struct gpio_extcon_data *data = dev_id;
59 queue_delayed_work(system_power_efficient_wq, &data->work,
60 data->debounce_jiffies);
61 return IRQ_HANDLED;
64 static int gpio_extcon_init(struct device *dev, struct gpio_extcon_data *data)
66 struct gpio_extcon_pdata *pdata = data->pdata;
67 int ret;
69 ret = devm_gpio_request_one(dev, pdata->gpio, GPIOF_DIR_IN,
70 dev_name(dev));
71 if (ret < 0)
72 return ret;
74 data->id_gpiod = gpio_to_desc(pdata->gpio);
75 if (!data->id_gpiod)
76 return -EINVAL;
78 if (pdata->debounce) {
79 ret = gpiod_set_debounce(data->id_gpiod,
80 pdata->debounce * 1000);
81 if (ret < 0)
82 data->debounce_jiffies =
83 msecs_to_jiffies(pdata->debounce);
86 data->irq = gpiod_to_irq(data->id_gpiod);
87 if (data->irq < 0)
88 return data->irq;
90 return 0;
93 static int gpio_extcon_probe(struct platform_device *pdev)
95 struct gpio_extcon_pdata *pdata = dev_get_platdata(&pdev->dev);
96 struct gpio_extcon_data *data;
97 int ret;
99 if (!pdata)
100 return -EBUSY;
101 if (!pdata->irq_flags || pdata->extcon_id > EXTCON_NONE)
102 return -EINVAL;
104 data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data),
105 GFP_KERNEL);
106 if (!data)
107 return -ENOMEM;
108 data->pdata = pdata;
110 /* Initialize the gpio */
111 ret = gpio_extcon_init(&pdev->dev, data);
112 if (ret < 0)
113 return ret;
115 /* Allocate the memory of extcon devie and register extcon device */
116 data->edev = devm_extcon_dev_allocate(&pdev->dev, &pdata->extcon_id);
117 if (IS_ERR(data->edev)) {
118 dev_err(&pdev->dev, "failed to allocate extcon device\n");
119 return -ENOMEM;
122 ret = devm_extcon_dev_register(&pdev->dev, data->edev);
123 if (ret < 0)
124 return ret;
126 INIT_DELAYED_WORK(&data->work, gpio_extcon_work);
129 * Request the interrput of gpio to detect whether external connector
130 * is attached or detached.
132 ret = devm_request_any_context_irq(&pdev->dev, data->irq,
133 gpio_irq_handler, pdata->irq_flags,
134 pdev->name, data);
135 if (ret < 0)
136 return ret;
138 platform_set_drvdata(pdev, data);
139 /* Perform initial detection */
140 gpio_extcon_work(&data->work.work);
142 return 0;
145 static int gpio_extcon_remove(struct platform_device *pdev)
147 struct gpio_extcon_data *data = platform_get_drvdata(pdev);
149 cancel_delayed_work_sync(&data->work);
151 return 0;
154 #ifdef CONFIG_PM_SLEEP
155 static int gpio_extcon_resume(struct device *dev)
157 struct gpio_extcon_data *data;
159 data = dev_get_drvdata(dev);
160 if (data->pdata->check_on_resume)
161 queue_delayed_work(system_power_efficient_wq,
162 &data->work, data->debounce_jiffies);
164 return 0;
166 #endif
168 static SIMPLE_DEV_PM_OPS(gpio_extcon_pm_ops, NULL, gpio_extcon_resume);
170 static struct platform_driver gpio_extcon_driver = {
171 .probe = gpio_extcon_probe,
172 .remove = gpio_extcon_remove,
173 .driver = {
174 .name = "extcon-gpio",
175 .pm = &gpio_extcon_pm_ops,
179 module_platform_driver(gpio_extcon_driver);
181 MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
182 MODULE_DESCRIPTION("GPIO extcon driver");
183 MODULE_LICENSE("GPL");