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be48308a MH |
1 | /* |
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 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/platform_device.h> | |
28 | #include <linux/slab.h> | |
be48308a MH |
29 | #include <linux/workqueue.h> |
30 | #include <linux/gpio.h> | |
31 | #include <linux/extcon.h> | |
fd116066 | 32 | #include <linux/extcon/extcon-gpio.h> |
be48308a MH |
33 | |
34 | struct gpio_extcon_data { | |
60cd62d4 | 35 | struct extcon_dev *edev; |
be48308a | 36 | unsigned gpio; |
5bfbdc9c | 37 | bool gpio_active_low; |
be48308a MH |
38 | const char *state_on; |
39 | const char *state_off; | |
40 | int irq; | |
41 | struct delayed_work work; | |
42 | unsigned long debounce_jiffies; | |
6544dfa5 | 43 | bool check_on_resume; |
be48308a MH |
44 | }; |
45 | ||
46 | static 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); | |
5bfbdc9c GR |
54 | if (data->gpio_active_low) |
55 | state = !state; | |
60cd62d4 | 56 | extcon_set_state(data->edev, state); |
be48308a MH |
57 | } |
58 | ||
59 | static irqreturn_t gpio_irq_handler(int irq, void *dev_id) | |
60 | { | |
61 | struct gpio_extcon_data *extcon_data = dev_id; | |
62 | ||
d0db2e7a | 63 | queue_delayed_work(system_power_efficient_wq, &extcon_data->work, |
be48308a MH |
64 | extcon_data->debounce_jiffies); |
65 | return IRQ_HANDLED; | |
66 | } | |
67 | ||
68 | static ssize_t extcon_gpio_print_state(struct extcon_dev *edev, char *buf) | |
69 | { | |
60cd62d4 CC |
70 | struct device *dev = edev->dev.parent; |
71 | struct gpio_extcon_data *extcon_data = dev_get_drvdata(dev); | |
be48308a | 72 | const char *state; |
60cd62d4 | 73 | |
be48308a MH |
74 | if (extcon_get_state(edev)) |
75 | state = extcon_data->state_on; | |
76 | else | |
77 | state = extcon_data->state_off; | |
78 | ||
79 | if (state) | |
80 | return sprintf(buf, "%s\n", state); | |
81 | return -EINVAL; | |
82 | } | |
83 | ||
44f34fd4 | 84 | static int gpio_extcon_probe(struct platform_device *pdev) |
be48308a | 85 | { |
7c0f6558 | 86 | struct gpio_extcon_platform_data *pdata = dev_get_platdata(&pdev->dev); |
be48308a | 87 | struct gpio_extcon_data *extcon_data; |
1073514b | 88 | int ret; |
be48308a MH |
89 | |
90 | if (!pdata) | |
91 | return -EBUSY; | |
92 | if (!pdata->irq_flags) { | |
93 | dev_err(&pdev->dev, "IRQ flag is not specified.\n"); | |
94 | return -EINVAL; | |
95 | } | |
96 | ||
97 | extcon_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data), | |
98 | GFP_KERNEL); | |
99 | if (!extcon_data) | |
100 | return -ENOMEM; | |
101 | ||
60cd62d4 CC |
102 | extcon_data->edev = devm_extcon_dev_allocate(&pdev->dev, NULL); |
103 | if (IS_ERR(extcon_data->edev)) { | |
104 | dev_err(&pdev->dev, "failed to allocate extcon device\n"); | |
105 | return -ENOMEM; | |
106 | } | |
107 | extcon_data->edev->name = pdata->name; | |
108 | extcon_data->edev->dev.parent = &pdev->dev; | |
109 | ||
be48308a | 110 | extcon_data->gpio = pdata->gpio; |
5bfbdc9c | 111 | extcon_data->gpio_active_low = pdata->gpio_active_low; |
be48308a MH |
112 | extcon_data->state_on = pdata->state_on; |
113 | extcon_data->state_off = pdata->state_off; | |
6544dfa5 | 114 | extcon_data->check_on_resume = pdata->check_on_resume; |
be48308a | 115 | if (pdata->state_on && pdata->state_off) |
60cd62d4 | 116 | extcon_data->edev->print_state = extcon_gpio_print_state; |
4288d9b8 GR |
117 | |
118 | ret = devm_gpio_request_one(&pdev->dev, extcon_data->gpio, GPIOF_DIR_IN, | |
119 | pdev->name); | |
120 | if (ret < 0) | |
121 | return ret; | |
122 | ||
338de0ca GR |
123 | if (pdata->debounce) { |
124 | ret = gpio_set_debounce(extcon_data->gpio, | |
125 | pdata->debounce * 1000); | |
126 | if (ret < 0) | |
127 | extcon_data->debounce_jiffies = | |
128 | msecs_to_jiffies(pdata->debounce); | |
129 | } | |
be48308a | 130 | |
60cd62d4 | 131 | ret = devm_extcon_dev_register(&pdev->dev, extcon_data->edev); |
be48308a | 132 | if (ret < 0) |
01eaf245 | 133 | return ret; |
be48308a | 134 | |
be48308a MH |
135 | INIT_DELAYED_WORK(&extcon_data->work, gpio_extcon_work); |
136 | ||
137 | extcon_data->irq = gpio_to_irq(extcon_data->gpio); | |
d92c2f12 SW |
138 | if (extcon_data->irq < 0) |
139 | return extcon_data->irq; | |
be48308a MH |
140 | |
141 | ret = request_any_context_irq(extcon_data->irq, gpio_irq_handler, | |
142 | pdata->irq_flags, pdev->name, | |
143 | extcon_data); | |
144 | if (ret < 0) | |
d92c2f12 | 145 | return ret; |
be48308a | 146 | |
b945f3fa | 147 | platform_set_drvdata(pdev, extcon_data); |
be48308a MH |
148 | /* Perform initial detection */ |
149 | gpio_extcon_work(&extcon_data->work.work); | |
150 | ||
151 | return 0; | |
be48308a MH |
152 | } |
153 | ||
93ed0327 | 154 | static int gpio_extcon_remove(struct platform_device *pdev) |
be48308a MH |
155 | { |
156 | struct gpio_extcon_data *extcon_data = platform_get_drvdata(pdev); | |
157 | ||
158 | cancel_delayed_work_sync(&extcon_data->work); | |
b945f3fa | 159 | free_irq(extcon_data->irq, extcon_data); |
be48308a MH |
160 | |
161 | return 0; | |
162 | } | |
163 | ||
6544dfa5 RY |
164 | #ifdef CONFIG_PM_SLEEP |
165 | static int gpio_extcon_resume(struct device *dev) | |
166 | { | |
167 | struct gpio_extcon_data *extcon_data; | |
168 | ||
169 | extcon_data = dev_get_drvdata(dev); | |
170 | if (extcon_data->check_on_resume) | |
171 | queue_delayed_work(system_power_efficient_wq, | |
172 | &extcon_data->work, extcon_data->debounce_jiffies); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | #endif | |
177 | ||
3cc731d9 | 178 | static SIMPLE_DEV_PM_OPS(gpio_extcon_pm_ops, NULL, gpio_extcon_resume); |
6544dfa5 | 179 | |
2878bda8 | 180 | static struct platform_driver gpio_extcon_driver = { |
be48308a | 181 | .probe = gpio_extcon_probe, |
5f7e2228 | 182 | .remove = gpio_extcon_remove, |
be48308a MH |
183 | .driver = { |
184 | .name = "extcon-gpio", | |
185 | .owner = THIS_MODULE, | |
6544dfa5 | 186 | .pm = &gpio_extcon_pm_ops, |
be48308a MH |
187 | }, |
188 | }; | |
189 | ||
2878bda8 | 190 | module_platform_driver(gpio_extcon_driver); |
be48308a MH |
191 | |
192 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); | |
193 | MODULE_DESCRIPTION("GPIO extcon driver"); | |
194 | MODULE_LICENSE("GPL"); |