Commit | Line | Data |
---|---|---|
be48308a | 1 | /* |
6ba12997 | 2 | * extcon_gpio.c - Single-state GPIO extcon driver based on extcon class |
be48308a MH |
3 | * |
4 | * Copyright (C) 2008 Google, Inc. | |
5 | * Author: Mike Lockwood <lockwood@android.com> | |
6 | * | |
7 | * Modified by MyungJoo Ham <myungjoo.ham@samsung.com> to support extcon | |
8 | * (originally switch class is supported) | |
9 | * | |
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. | |
13 | * | |
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. | |
6ba12997 | 18 | */ |
be48308a | 19 | |
62364357 GC |
20 | #include <linux/extcon.h> |
21 | #include <linux/extcon/extcon-gpio.h> | |
22 | #include <linux/gpio.h> | |
de992acb | 23 | #include <linux/gpio/consumer.h> |
be48308a MH |
24 | #include <linux/init.h> |
25 | #include <linux/interrupt.h> | |
62364357 GC |
26 | #include <linux/kernel.h> |
27 | #include <linux/module.h> | |
be48308a MH |
28 | #include <linux/platform_device.h> |
29 | #include <linux/slab.h> | |
be48308a | 30 | #include <linux/workqueue.h> |
be48308a MH |
31 | |
32 | struct gpio_extcon_data { | |
60cd62d4 | 33 | struct extcon_dev *edev; |
be48308a MH |
34 | int irq; |
35 | struct delayed_work work; | |
36 | unsigned long debounce_jiffies; | |
60f9b9e6 | 37 | |
de992acb | 38 | struct gpio_desc *id_gpiod; |
6ba12997 | 39 | struct gpio_extcon_pdata *pdata; |
be48308a MH |
40 | }; |
41 | ||
42 | static void gpio_extcon_work(struct work_struct *work) | |
43 | { | |
44 | int state; | |
45 | struct gpio_extcon_data *data = | |
46 | container_of(to_delayed_work(work), struct gpio_extcon_data, | |
47 | work); | |
48 | ||
de992acb | 49 | state = gpiod_get_value_cansleep(data->id_gpiod); |
60f9b9e6 | 50 | if (data->pdata->gpio_active_low) |
5bfbdc9c | 51 | state = !state; |
60cd62d4 | 52 | extcon_set_state(data->edev, state); |
be48308a MH |
53 | } |
54 | ||
55 | static irqreturn_t gpio_irq_handler(int irq, void *dev_id) | |
56 | { | |
60f9b9e6 | 57 | struct gpio_extcon_data *data = dev_id; |
be48308a | 58 | |
60f9b9e6 CC |
59 | queue_delayed_work(system_power_efficient_wq, &data->work, |
60 | data->debounce_jiffies); | |
be48308a MH |
61 | return IRQ_HANDLED; |
62 | } | |
63 | ||
de992acb CC |
64 | static int gpio_extcon_init(struct device *dev, struct gpio_extcon_data *data) |
65 | { | |
66 | struct gpio_extcon_pdata *pdata = data->pdata; | |
67 | int ret; | |
68 | ||
69 | ret = devm_gpio_request_one(dev, pdata->gpio, GPIOF_DIR_IN, | |
70 | dev_name(dev)); | |
71 | if (ret < 0) | |
72 | return ret; | |
73 | ||
74 | data->id_gpiod = gpio_to_desc(pdata->gpio); | |
75 | if (!data->id_gpiod) | |
76 | return -EINVAL; | |
77 | ||
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); | |
84 | } | |
85 | ||
86 | data->irq = gpiod_to_irq(data->id_gpiod); | |
87 | if (data->irq < 0) | |
88 | return data->irq; | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
44f34fd4 | 93 | static int gpio_extcon_probe(struct platform_device *pdev) |
be48308a | 94 | { |
6ba12997 | 95 | struct gpio_extcon_pdata *pdata = dev_get_platdata(&pdev->dev); |
60f9b9e6 | 96 | struct gpio_extcon_data *data; |
1073514b | 97 | int ret; |
be48308a MH |
98 | |
99 | if (!pdata) | |
100 | return -EBUSY; | |
ce6f7496 | 101 | if (!pdata->irq_flags || pdata->extcon_id > EXTCON_NONE) |
be48308a | 102 | return -EINVAL; |
be48308a | 103 | |
60f9b9e6 | 104 | data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data), |
be48308a | 105 | GFP_KERNEL); |
60f9b9e6 | 106 | if (!data) |
be48308a | 107 | return -ENOMEM; |
60f9b9e6 | 108 | data->pdata = pdata; |
60cd62d4 | 109 | |
de992acb CC |
110 | /* Initialize the gpio */ |
111 | ret = gpio_extcon_init(&pdev->dev, data); | |
4288d9b8 GR |
112 | if (ret < 0) |
113 | return ret; | |
114 | ||
de992acb CC |
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; | |
338de0ca | 120 | } |
be48308a | 121 | |
60f9b9e6 | 122 | ret = devm_extcon_dev_register(&pdev->dev, data->edev); |
be48308a | 123 | if (ret < 0) |
01eaf245 | 124 | return ret; |
be48308a | 125 | |
60f9b9e6 | 126 | INIT_DELAYED_WORK(&data->work, gpio_extcon_work); |
be48308a | 127 | |
de992acb CC |
128 | /* |
129 | * Request the interrput of gpio to detect whether external connector | |
130 | * is attached or detached. | |
131 | */ | |
60f9b9e6 | 132 | ret = devm_request_any_context_irq(&pdev->dev, data->irq, |
ae59f3a2 | 133 | gpio_irq_handler, pdata->irq_flags, |
60f9b9e6 | 134 | pdev->name, data); |
be48308a | 135 | if (ret < 0) |
d92c2f12 | 136 | return ret; |
be48308a | 137 | |
60f9b9e6 | 138 | platform_set_drvdata(pdev, data); |
be48308a | 139 | /* Perform initial detection */ |
60f9b9e6 | 140 | gpio_extcon_work(&data->work.work); |
be48308a MH |
141 | |
142 | return 0; | |
be48308a MH |
143 | } |
144 | ||
93ed0327 | 145 | static int gpio_extcon_remove(struct platform_device *pdev) |
be48308a | 146 | { |
60f9b9e6 | 147 | struct gpio_extcon_data *data = platform_get_drvdata(pdev); |
be48308a | 148 | |
60f9b9e6 | 149 | cancel_delayed_work_sync(&data->work); |
be48308a MH |
150 | |
151 | return 0; | |
152 | } | |
153 | ||
6544dfa5 RY |
154 | #ifdef CONFIG_PM_SLEEP |
155 | static int gpio_extcon_resume(struct device *dev) | |
156 | { | |
60f9b9e6 | 157 | struct gpio_extcon_data *data; |
6544dfa5 | 158 | |
60f9b9e6 CC |
159 | data = dev_get_drvdata(dev); |
160 | if (data->pdata->check_on_resume) | |
6544dfa5 | 161 | queue_delayed_work(system_power_efficient_wq, |
60f9b9e6 | 162 | &data->work, data->debounce_jiffies); |
6544dfa5 RY |
163 | |
164 | return 0; | |
165 | } | |
166 | #endif | |
167 | ||
3cc731d9 | 168 | static SIMPLE_DEV_PM_OPS(gpio_extcon_pm_ops, NULL, gpio_extcon_resume); |
6544dfa5 | 169 | |
2878bda8 | 170 | static struct platform_driver gpio_extcon_driver = { |
be48308a | 171 | .probe = gpio_extcon_probe, |
5f7e2228 | 172 | .remove = gpio_extcon_remove, |
be48308a MH |
173 | .driver = { |
174 | .name = "extcon-gpio", | |
6544dfa5 | 175 | .pm = &gpio_extcon_pm_ops, |
be48308a MH |
176 | }, |
177 | }; | |
178 | ||
2878bda8 | 179 | module_platform_driver(gpio_extcon_driver); |
be48308a MH |
180 | |
181 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); | |
182 | MODULE_DESCRIPTION("GPIO extcon driver"); | |
183 | MODULE_LICENSE("GPL"); |