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