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Commit | Line | Data |
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78a56aab PB |
1 | /* |
2 | * Driver for keys on GPIO lines capable of generating interrupts. | |
3 | * | |
4 | * Copyright 2005 Phil Blundell | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
78a56aab PB |
12 | |
13 | #include <linux/init.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/irq.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/pm.h> | |
19 | #include <linux/sysctl.h> | |
20 | #include <linux/proc_fs.h> | |
21 | #include <linux/delay.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/input.h> | |
49015bee | 24 | #include <linux/gpio_keys.h> |
da0d03fe | 25 | #include <linux/workqueue.h> |
111bc59c | 26 | #include <linux/gpio.h> |
78a56aab | 27 | |
a33466e3 DES |
28 | struct gpio_button_data { |
29 | struct gpio_keys_button *button; | |
30 | struct input_dev *input; | |
ca865a77 | 31 | struct timer_list timer; |
da0d03fe | 32 | struct work_struct work; |
a33466e3 DES |
33 | }; |
34 | ||
35 | struct gpio_keys_drvdata { | |
36 | struct input_dev *input; | |
37 | struct gpio_button_data data[0]; | |
38 | }; | |
39 | ||
da0d03fe | 40 | static void gpio_keys_report_event(struct work_struct *work) |
a33466e3 | 41 | { |
da0d03fe JN |
42 | struct gpio_button_data *bdata = |
43 | container_of(work, struct gpio_button_data, work); | |
ce25d7e9 UKK |
44 | struct gpio_keys_button *button = bdata->button; |
45 | struct input_dev *input = bdata->input; | |
a33466e3 DES |
46 | unsigned int type = button->type ?: EV_KEY; |
47 | int state = (gpio_get_value(button->gpio) ? 1 : 0) ^ button->active_low; | |
48 | ||
49 | input_event(input, type, button->code, !!state); | |
50 | input_sync(input); | |
51 | } | |
52 | ||
da0d03fe | 53 | static void gpio_keys_timer(unsigned long _data) |
ca865a77 JN |
54 | { |
55 | struct gpio_button_data *data = (struct gpio_button_data *)_data; | |
56 | ||
da0d03fe | 57 | schedule_work(&data->work); |
ca865a77 JN |
58 | } |
59 | ||
78a56aab PB |
60 | static irqreturn_t gpio_keys_isr(int irq, void *dev_id) |
61 | { | |
57ffe9d5 UKK |
62 | struct gpio_button_data *bdata = dev_id; |
63 | struct gpio_keys_button *button = bdata->button; | |
78a56aab | 64 | |
57ffe9d5 | 65 | BUG_ON(irq != gpio_to_irq(button->gpio)); |
84767d00 | 66 | |
ca865a77 JN |
67 | if (button->debounce_interval) |
68 | mod_timer(&bdata->timer, | |
69 | jiffies + msecs_to_jiffies(button->debounce_interval)); | |
70 | else | |
da0d03fe | 71 | schedule_work(&bdata->work); |
78a56aab | 72 | |
57ffe9d5 | 73 | return IRQ_HANDLED; |
78a56aab PB |
74 | } |
75 | ||
76 | static int __devinit gpio_keys_probe(struct platform_device *pdev) | |
77 | { | |
78 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; | |
a33466e3 | 79 | struct gpio_keys_drvdata *ddata; |
db19fd8b | 80 | struct device *dev = &pdev->dev; |
78a56aab PB |
81 | struct input_dev *input; |
82 | int i, error; | |
e15b0213 | 83 | int wakeup = 0; |
78a56aab | 84 | |
a33466e3 DES |
85 | ddata = kzalloc(sizeof(struct gpio_keys_drvdata) + |
86 | pdata->nbuttons * sizeof(struct gpio_button_data), | |
87 | GFP_KERNEL); | |
78a56aab | 88 | input = input_allocate_device(); |
a33466e3 | 89 | if (!ddata || !input) { |
db19fd8b | 90 | dev_err(dev, "failed to allocate state\n"); |
a33466e3 DES |
91 | error = -ENOMEM; |
92 | goto fail1; | |
93 | } | |
78a56aab | 94 | |
a33466e3 | 95 | platform_set_drvdata(pdev, ddata); |
78a56aab PB |
96 | |
97 | input->name = pdev->name; | |
98 | input->phys = "gpio-keys/input0"; | |
469ba4df | 99 | input->dev.parent = &pdev->dev; |
78a56aab PB |
100 | |
101 | input->id.bustype = BUS_HOST; | |
102 | input->id.vendor = 0x0001; | |
103 | input->id.product = 0x0001; | |
104 | input->id.version = 0x0100; | |
105 | ||
b67b4b11 DC |
106 | /* Enable auto repeat feature of Linux input subsystem */ |
107 | if (pdata->rep) | |
108 | __set_bit(EV_REP, input->evbit); | |
109 | ||
a33466e3 DES |
110 | ddata->input = input; |
111 | ||
78a56aab | 112 | for (i = 0; i < pdata->nbuttons; i++) { |
84767d00 | 113 | struct gpio_keys_button *button = &pdata->buttons[i]; |
a33466e3 | 114 | struct gpio_button_data *bdata = &ddata->data[i]; |
6a2e3911 | 115 | int irq; |
84767d00 | 116 | unsigned int type = button->type ?: EV_KEY; |
78a56aab | 117 | |
a33466e3 | 118 | bdata->input = input; |
74dd4393 | 119 | bdata->button = button; |
ca865a77 | 120 | setup_timer(&bdata->timer, |
da0d03fe JN |
121 | gpio_keys_timer, (unsigned long)bdata); |
122 | INIT_WORK(&bdata->work, gpio_keys_report_event); | |
a33466e3 | 123 | |
6a2e3911 HVR |
124 | error = gpio_request(button->gpio, button->desc ?: "gpio_keys"); |
125 | if (error < 0) { | |
db19fd8b BD |
126 | dev_err(dev, "failed to request GPIO %d, error %d\n", |
127 | button->gpio, error); | |
a33466e3 | 128 | goto fail2; |
6a2e3911 HVR |
129 | } |
130 | ||
131 | error = gpio_direction_input(button->gpio); | |
132 | if (error < 0) { | |
db19fd8b | 133 | dev_err(dev, "failed to configure" |
6a2e3911 HVR |
134 | " direction for GPIO %d, error %d\n", |
135 | button->gpio, error); | |
136 | gpio_free(button->gpio); | |
a33466e3 | 137 | goto fail2; |
6a2e3911 HVR |
138 | } |
139 | ||
140 | irq = gpio_to_irq(button->gpio); | |
006df302 AS |
141 | if (irq < 0) { |
142 | error = irq; | |
db19fd8b BD |
143 | dev_err(dev, "Unable to get irq number " |
144 | "for GPIO %d, error %d\n", | |
006df302 | 145 | button->gpio, error); |
6a2e3911 | 146 | gpio_free(button->gpio); |
a33466e3 | 147 | goto fail2; |
006df302 AS |
148 | } |
149 | ||
150 | error = request_irq(irq, gpio_keys_isr, | |
558a5e29 | 151 | IRQF_SHARED | |
64e8563c | 152 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
006df302 | 153 | button->desc ? button->desc : "gpio_keys", |
57ffe9d5 | 154 | bdata); |
78a56aab | 155 | if (error) { |
db19fd8b | 156 | dev_err(dev, "Unable to claim irq %d; error %d\n", |
0d98f6bb | 157 | irq, error); |
6a2e3911 | 158 | gpio_free(button->gpio); |
a33466e3 | 159 | goto fail2; |
78a56aab | 160 | } |
84767d00 | 161 | |
e15b0213 AS |
162 | if (button->wakeup) |
163 | wakeup = 1; | |
164 | ||
84767d00 | 165 | input_set_capability(input, type, button->code); |
78a56aab PB |
166 | } |
167 | ||
168 | error = input_register_device(input); | |
169 | if (error) { | |
db19fd8b | 170 | dev_err(dev, "Unable to register input device, " |
006df302 | 171 | "error: %d\n", error); |
a33466e3 | 172 | goto fail2; |
78a56aab PB |
173 | } |
174 | ||
e15b0213 AS |
175 | device_init_wakeup(&pdev->dev, wakeup); |
176 | ||
78a56aab PB |
177 | return 0; |
178 | ||
a33466e3 | 179 | fail2: |
6a2e3911 | 180 | while (--i >= 0) { |
57ffe9d5 | 181 | free_irq(gpio_to_irq(pdata->buttons[i].gpio), &ddata->data[i]); |
ca865a77 JN |
182 | if (pdata->buttons[i].debounce_interval) |
183 | del_timer_sync(&ddata->data[i].timer); | |
da0d03fe | 184 | cancel_work_sync(&ddata->data[i].work); |
6a2e3911 HVR |
185 | gpio_free(pdata->buttons[i].gpio); |
186 | } | |
78a56aab | 187 | |
006df302 | 188 | platform_set_drvdata(pdev, NULL); |
a33466e3 | 189 | fail1: |
78a56aab | 190 | input_free_device(input); |
a33466e3 | 191 | kfree(ddata); |
78a56aab PB |
192 | |
193 | return error; | |
194 | } | |
195 | ||
196 | static int __devexit gpio_keys_remove(struct platform_device *pdev) | |
197 | { | |
198 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; | |
a33466e3 DES |
199 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); |
200 | struct input_dev *input = ddata->input; | |
78a56aab PB |
201 | int i; |
202 | ||
e15b0213 AS |
203 | device_init_wakeup(&pdev->dev, 0); |
204 | ||
78a56aab | 205 | for (i = 0; i < pdata->nbuttons; i++) { |
0d98f6bb | 206 | int irq = gpio_to_irq(pdata->buttons[i].gpio); |
57ffe9d5 | 207 | free_irq(irq, &ddata->data[i]); |
ca865a77 JN |
208 | if (pdata->buttons[i].debounce_interval) |
209 | del_timer_sync(&ddata->data[i].timer); | |
da0d03fe | 210 | cancel_work_sync(&ddata->data[i].work); |
6a2e3911 | 211 | gpio_free(pdata->buttons[i].gpio); |
78a56aab PB |
212 | } |
213 | ||
214 | input_unregister_device(input); | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
e15b0213 AS |
219 | |
220 | #ifdef CONFIG_PM | |
ae78e0e0 | 221 | static int gpio_keys_suspend(struct device *dev) |
e15b0213 | 222 | { |
ae78e0e0 | 223 | struct platform_device *pdev = to_platform_device(dev); |
e15b0213 AS |
224 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; |
225 | int i; | |
226 | ||
227 | if (device_may_wakeup(&pdev->dev)) { | |
228 | for (i = 0; i < pdata->nbuttons; i++) { | |
229 | struct gpio_keys_button *button = &pdata->buttons[i]; | |
230 | if (button->wakeup) { | |
231 | int irq = gpio_to_irq(button->gpio); | |
232 | enable_irq_wake(irq); | |
233 | } | |
234 | } | |
235 | } | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
ae78e0e0 | 240 | static int gpio_keys_resume(struct device *dev) |
e15b0213 | 241 | { |
ae78e0e0 | 242 | struct platform_device *pdev = to_platform_device(dev); |
e15b0213 AS |
243 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; |
244 | int i; | |
245 | ||
246 | if (device_may_wakeup(&pdev->dev)) { | |
247 | for (i = 0; i < pdata->nbuttons; i++) { | |
248 | struct gpio_keys_button *button = &pdata->buttons[i]; | |
249 | if (button->wakeup) { | |
250 | int irq = gpio_to_irq(button->gpio); | |
251 | disable_irq_wake(irq); | |
252 | } | |
253 | } | |
254 | } | |
255 | ||
256 | return 0; | |
257 | } | |
ae78e0e0 MR |
258 | |
259 | static const struct dev_pm_ops gpio_keys_pm_ops = { | |
260 | .suspend = gpio_keys_suspend, | |
261 | .resume = gpio_keys_resume, | |
262 | }; | |
e15b0213 AS |
263 | #endif |
264 | ||
9b07044c | 265 | static struct platform_driver gpio_keys_device_driver = { |
78a56aab PB |
266 | .probe = gpio_keys_probe, |
267 | .remove = __devexit_p(gpio_keys_remove), | |
268 | .driver = { | |
269 | .name = "gpio-keys", | |
d7b5247b | 270 | .owner = THIS_MODULE, |
ae78e0e0 MR |
271 | #ifdef CONFIG_PM |
272 | .pm = &gpio_keys_pm_ops, | |
273 | #endif | |
78a56aab PB |
274 | } |
275 | }; | |
276 | ||
277 | static int __init gpio_keys_init(void) | |
278 | { | |
279 | return platform_driver_register(&gpio_keys_device_driver); | |
280 | } | |
281 | ||
282 | static void __exit gpio_keys_exit(void) | |
283 | { | |
284 | platform_driver_unregister(&gpio_keys_device_driver); | |
285 | } | |
286 | ||
287 | module_init(gpio_keys_init); | |
288 | module_exit(gpio_keys_exit); | |
289 | ||
290 | MODULE_LICENSE("GPL"); | |
291 | MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>"); | |
292 | MODULE_DESCRIPTION("Keyboard driver for CPU GPIOs"); | |
d7b5247b | 293 | MODULE_ALIAS("platform:gpio-keys"); |