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; |
cb9850d0 | 52 | |
8670b459 | 53 | extcon_set_state_sync(data->edev, data->pdata->extcon_id, state); |
be48308a MH |
54 | } |
55 | ||
56 | static irqreturn_t gpio_irq_handler(int irq, void *dev_id) | |
57 | { | |
60f9b9e6 | 58 | struct gpio_extcon_data *data = dev_id; |
be48308a | 59 | |
60f9b9e6 CC |
60 | queue_delayed_work(system_power_efficient_wq, &data->work, |
61 | data->debounce_jiffies); | |
be48308a MH |
62 | return IRQ_HANDLED; |
63 | } | |
64 | ||
de992acb CC |
65 | static int gpio_extcon_init(struct device *dev, struct gpio_extcon_data *data) |
66 | { | |
67 | struct gpio_extcon_pdata *pdata = data->pdata; | |
68 | int ret; | |
69 | ||
70 | ret = devm_gpio_request_one(dev, pdata->gpio, GPIOF_DIR_IN, | |
71 | dev_name(dev)); | |
72 | if (ret < 0) | |
73 | return ret; | |
74 | ||
75 | data->id_gpiod = gpio_to_desc(pdata->gpio); | |
76 | if (!data->id_gpiod) | |
77 | return -EINVAL; | |
78 | ||
79 | if (pdata->debounce) { | |
80 | ret = gpiod_set_debounce(data->id_gpiod, | |
81 | pdata->debounce * 1000); | |
82 | if (ret < 0) | |
83 | data->debounce_jiffies = | |
84 | msecs_to_jiffies(pdata->debounce); | |
85 | } | |
86 | ||
87 | data->irq = gpiod_to_irq(data->id_gpiod); | |
88 | if (data->irq < 0) | |
89 | return data->irq; | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
44f34fd4 | 94 | static int gpio_extcon_probe(struct platform_device *pdev) |
be48308a | 95 | { |
6ba12997 | 96 | struct gpio_extcon_pdata *pdata = dev_get_platdata(&pdev->dev); |
60f9b9e6 | 97 | struct gpio_extcon_data *data; |
1073514b | 98 | int ret; |
be48308a MH |
99 | |
100 | if (!pdata) | |
101 | return -EBUSY; | |
ce6f7496 | 102 | if (!pdata->irq_flags || pdata->extcon_id > EXTCON_NONE) |
be48308a | 103 | return -EINVAL; |
be48308a | 104 | |
60f9b9e6 | 105 | data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data), |
be48308a | 106 | GFP_KERNEL); |
60f9b9e6 | 107 | if (!data) |
be48308a | 108 | return -ENOMEM; |
60f9b9e6 | 109 | data->pdata = pdata; |
60cd62d4 | 110 | |
de992acb CC |
111 | /* Initialize the gpio */ |
112 | ret = gpio_extcon_init(&pdev->dev, data); | |
4288d9b8 GR |
113 | if (ret < 0) |
114 | return ret; | |
115 | ||
de992acb CC |
116 | /* Allocate the memory of extcon devie and register extcon device */ |
117 | data->edev = devm_extcon_dev_allocate(&pdev->dev, &pdata->extcon_id); | |
118 | if (IS_ERR(data->edev)) { | |
119 | dev_err(&pdev->dev, "failed to allocate extcon device\n"); | |
120 | return -ENOMEM; | |
338de0ca | 121 | } |
be48308a | 122 | |
60f9b9e6 | 123 | ret = devm_extcon_dev_register(&pdev->dev, data->edev); |
be48308a | 124 | if (ret < 0) |
01eaf245 | 125 | return ret; |
be48308a | 126 | |
60f9b9e6 | 127 | INIT_DELAYED_WORK(&data->work, gpio_extcon_work); |
be48308a | 128 | |
de992acb | 129 | /* |
b51b3870 | 130 | * Request the interrupt of gpio to detect whether external connector |
de992acb CC |
131 | * is attached or detached. |
132 | */ | |
60f9b9e6 | 133 | ret = devm_request_any_context_irq(&pdev->dev, data->irq, |
ae59f3a2 | 134 | gpio_irq_handler, pdata->irq_flags, |
60f9b9e6 | 135 | pdev->name, data); |
be48308a | 136 | if (ret < 0) |
d92c2f12 | 137 | return ret; |
be48308a | 138 | |
60f9b9e6 | 139 | platform_set_drvdata(pdev, data); |
be48308a | 140 | /* Perform initial detection */ |
60f9b9e6 | 141 | gpio_extcon_work(&data->work.work); |
be48308a MH |
142 | |
143 | return 0; | |
be48308a MH |
144 | } |
145 | ||
93ed0327 | 146 | static int gpio_extcon_remove(struct platform_device *pdev) |
be48308a | 147 | { |
60f9b9e6 | 148 | struct gpio_extcon_data *data = platform_get_drvdata(pdev); |
be48308a | 149 | |
60f9b9e6 | 150 | cancel_delayed_work_sync(&data->work); |
be48308a MH |
151 | |
152 | return 0; | |
153 | } | |
154 | ||
6544dfa5 RY |
155 | #ifdef CONFIG_PM_SLEEP |
156 | static int gpio_extcon_resume(struct device *dev) | |
157 | { | |
60f9b9e6 | 158 | struct gpio_extcon_data *data; |
6544dfa5 | 159 | |
60f9b9e6 CC |
160 | data = dev_get_drvdata(dev); |
161 | if (data->pdata->check_on_resume) | |
6544dfa5 | 162 | queue_delayed_work(system_power_efficient_wq, |
60f9b9e6 | 163 | &data->work, data->debounce_jiffies); |
6544dfa5 RY |
164 | |
165 | return 0; | |
166 | } | |
167 | #endif | |
168 | ||
3cc731d9 | 169 | static SIMPLE_DEV_PM_OPS(gpio_extcon_pm_ops, NULL, gpio_extcon_resume); |
6544dfa5 | 170 | |
2878bda8 | 171 | static struct platform_driver gpio_extcon_driver = { |
be48308a | 172 | .probe = gpio_extcon_probe, |
5f7e2228 | 173 | .remove = gpio_extcon_remove, |
be48308a MH |
174 | .driver = { |
175 | .name = "extcon-gpio", | |
6544dfa5 | 176 | .pm = &gpio_extcon_pm_ops, |
be48308a MH |
177 | }, |
178 | }; | |
179 | ||
2878bda8 | 180 | module_platform_driver(gpio_extcon_driver); |
be48308a MH |
181 | |
182 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); | |
183 | MODULE_DESCRIPTION("GPIO extcon driver"); | |
184 | MODULE_LICENSE("GPL"); |