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MyungJoo Hambe483082012-04-20 14:16:23 +09001/*
2 * drivers/extcon/extcon_gpio.c
3 *
4 * Single-state GPIO extcon driver based on extcon class
5 *
6 * Copyright (C) 2008 Google, Inc.
7 * Author: Mike Lockwood <lockwood@android.com>
8 *
9 * Modified by MyungJoo Ham <myungjoo.ham@samsung.com> to support extcon
10 * (originally switch class is supported)
11 *
12 * This software is licensed under the terms of the GNU General Public
13 * License version 2, as published by the Free Software Foundation, and
14 * may be copied, distributed, and modified under those terms.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21*/
22
George Cherian62364352014-09-09 09:44:34 +053023#include <linux/extcon.h>
24#include <linux/extcon/extcon-gpio.h>
25#include <linux/gpio.h>
MyungJoo Hambe483082012-04-20 14:16:23 +090026#include <linux/init.h>
27#include <linux/interrupt.h>
George Cherian62364352014-09-09 09:44:34 +053028#include <linux/kernel.h>
29#include <linux/module.h>
MyungJoo Hambe483082012-04-20 14:16:23 +090030#include <linux/platform_device.h>
31#include <linux/slab.h>
MyungJoo Hambe483082012-04-20 14:16:23 +090032#include <linux/workqueue.h>
MyungJoo Hambe483082012-04-20 14:16:23 +090033
34struct gpio_extcon_data {
Chanwoo Choi60cd62d2014-04-21 20:51:08 +090035 struct extcon_dev *edev;
MyungJoo Hambe483082012-04-20 14:16:23 +090036 unsigned gpio;
Guenter Roeck5bfbdc92013-09-12 08:49:54 +090037 bool gpio_active_low;
MyungJoo Hambe483082012-04-20 14:16:23 +090038 const char *state_on;
39 const char *state_off;
40 int irq;
41 struct delayed_work work;
42 unsigned long debounce_jiffies;
Rongjun Ying6544dfa2014-01-09 09:50:13 +090043 bool check_on_resume;
MyungJoo Hambe483082012-04-20 14:16:23 +090044};
45
46static void gpio_extcon_work(struct work_struct *work)
47{
48 int state;
49 struct gpio_extcon_data *data =
50 container_of(to_delayed_work(work), struct gpio_extcon_data,
51 work);
52
53 state = gpio_get_value(data->gpio);
Guenter Roeck5bfbdc92013-09-12 08:49:54 +090054 if (data->gpio_active_low)
55 state = !state;
Chanwoo Choi60cd62d2014-04-21 20:51:08 +090056 extcon_set_state(data->edev, state);
MyungJoo Hambe483082012-04-20 14:16:23 +090057}
58
59static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
60{
61 struct gpio_extcon_data *extcon_data = dev_id;
62
Mark Brownd0db2e72013-07-19 18:47:34 +010063 queue_delayed_work(system_power_efficient_wq, &extcon_data->work,
MyungJoo Hambe483082012-04-20 14:16:23 +090064 extcon_data->debounce_jiffies);
65 return IRQ_HANDLED;
66}
67
Bill Pemberton44f34fd2012-11-19 13:23:21 -050068static int gpio_extcon_probe(struct platform_device *pdev)
MyungJoo Hambe483082012-04-20 14:16:23 +090069{
Jingoo Han7c0f65582013-09-11 13:22:18 +090070 struct gpio_extcon_platform_data *pdata = dev_get_platdata(&pdev->dev);
MyungJoo Hambe483082012-04-20 14:16:23 +090071 struct gpio_extcon_data *extcon_data;
Guenter Roeck10735142013-08-29 21:29:33 -070072 int ret;
MyungJoo Hambe483082012-04-20 14:16:23 +090073
74 if (!pdata)
75 return -EBUSY;
76 if (!pdata->irq_flags) {
77 dev_err(&pdev->dev, "IRQ flag is not specified.\n");
78 return -EINVAL;
79 }
80
81 extcon_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data),
82 GFP_KERNEL);
83 if (!extcon_data)
84 return -ENOMEM;
85
Chanwoo Choi60cd62d2014-04-21 20:51:08 +090086 extcon_data->edev = devm_extcon_dev_allocate(&pdev->dev, NULL);
87 if (IS_ERR(extcon_data->edev)) {
88 dev_err(&pdev->dev, "failed to allocate extcon device\n");
89 return -ENOMEM;
90 }
Chanwoo Choi60cd62d2014-04-21 20:51:08 +090091
MyungJoo Hambe483082012-04-20 14:16:23 +090092 extcon_data->gpio = pdata->gpio;
Guenter Roeck5bfbdc92013-09-12 08:49:54 +090093 extcon_data->gpio_active_low = pdata->gpio_active_low;
MyungJoo Hambe483082012-04-20 14:16:23 +090094 extcon_data->state_on = pdata->state_on;
95 extcon_data->state_off = pdata->state_off;
Rongjun Ying6544dfa2014-01-09 09:50:13 +090096 extcon_data->check_on_resume = pdata->check_on_resume;
Guenter Roeck4288d9b2013-11-22 09:26:01 -080097
98 ret = devm_gpio_request_one(&pdev->dev, extcon_data->gpio, GPIOF_DIR_IN,
99 pdev->name);
100 if (ret < 0)
101 return ret;
102
Guenter Roeck338de0c2013-09-10 19:16:18 -0700103 if (pdata->debounce) {
104 ret = gpio_set_debounce(extcon_data->gpio,
105 pdata->debounce * 1000);
106 if (ret < 0)
107 extcon_data->debounce_jiffies =
108 msecs_to_jiffies(pdata->debounce);
109 }
MyungJoo Hambe483082012-04-20 14:16:23 +0900110
Chanwoo Choi60cd62d2014-04-21 20:51:08 +0900111 ret = devm_extcon_dev_register(&pdev->dev, extcon_data->edev);
MyungJoo Hambe483082012-04-20 14:16:23 +0900112 if (ret < 0)
Axel Lin01eaf242012-06-16 11:56:24 +0800113 return ret;
MyungJoo Hambe483082012-04-20 14:16:23 +0900114
MyungJoo Hambe483082012-04-20 14:16:23 +0900115 INIT_DELAYED_WORK(&extcon_data->work, gpio_extcon_work);
116
117 extcon_data->irq = gpio_to_irq(extcon_data->gpio);
Sangjung Wood92c2f12014-04-21 19:10:10 +0900118 if (extcon_data->irq < 0)
119 return extcon_data->irq;
MyungJoo Hambe483082012-04-20 14:16:23 +0900120
121 ret = request_any_context_irq(extcon_data->irq, gpio_irq_handler,
122 pdata->irq_flags, pdev->name,
123 extcon_data);
124 if (ret < 0)
Sangjung Wood92c2f12014-04-21 19:10:10 +0900125 return ret;
MyungJoo Hambe483082012-04-20 14:16:23 +0900126
Axel Linb945f3f2012-06-16 11:55:18 +0800127 platform_set_drvdata(pdev, extcon_data);
MyungJoo Hambe483082012-04-20 14:16:23 +0900128 /* Perform initial detection */
129 gpio_extcon_work(&extcon_data->work.work);
130
131 return 0;
MyungJoo Hambe483082012-04-20 14:16:23 +0900132}
133
Bill Pemberton93ed0322012-11-19 13:25:49 -0500134static int gpio_extcon_remove(struct platform_device *pdev)
MyungJoo Hambe483082012-04-20 14:16:23 +0900135{
136 struct gpio_extcon_data *extcon_data = platform_get_drvdata(pdev);
137
138 cancel_delayed_work_sync(&extcon_data->work);
Axel Linb945f3f2012-06-16 11:55:18 +0800139 free_irq(extcon_data->irq, extcon_data);
MyungJoo Hambe483082012-04-20 14:16:23 +0900140
141 return 0;
142}
143
Rongjun Ying6544dfa2014-01-09 09:50:13 +0900144#ifdef CONFIG_PM_SLEEP
145static int gpio_extcon_resume(struct device *dev)
146{
147 struct gpio_extcon_data *extcon_data;
148
149 extcon_data = dev_get_drvdata(dev);
150 if (extcon_data->check_on_resume)
151 queue_delayed_work(system_power_efficient_wq,
152 &extcon_data->work, extcon_data->debounce_jiffies);
153
154 return 0;
155}
156#endif
157
Jingoo Han3cc731d2014-02-27 20:37:15 +0900158static SIMPLE_DEV_PM_OPS(gpio_extcon_pm_ops, NULL, gpio_extcon_resume);
Rongjun Ying6544dfa2014-01-09 09:50:13 +0900159
H Hartley Sweeten2878bda2012-05-02 15:38:44 -0700160static struct platform_driver gpio_extcon_driver = {
MyungJoo Hambe483082012-04-20 14:16:23 +0900161 .probe = gpio_extcon_probe,
Bill Pemberton5f7e2222012-11-19 13:20:06 -0500162 .remove = gpio_extcon_remove,
MyungJoo Hambe483082012-04-20 14:16:23 +0900163 .driver = {
164 .name = "extcon-gpio",
Rongjun Ying6544dfa2014-01-09 09:50:13 +0900165 .pm = &gpio_extcon_pm_ops,
MyungJoo Hambe483082012-04-20 14:16:23 +0900166 },
167};
168
H Hartley Sweeten2878bda2012-05-02 15:38:44 -0700169module_platform_driver(gpio_extcon_driver);
MyungJoo Hambe483082012-04-20 14:16:23 +0900170
171MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
172MODULE_DESCRIPTION("GPIO extcon driver");
173MODULE_LICENSE("GPL");