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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> | |
12 | #include <linux/version.h> | |
13 | ||
14 | #include <linux/init.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/irq.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/pm.h> | |
20 | #include <linux/sysctl.h> | |
21 | #include <linux/proc_fs.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/input.h> | |
49015bee | 25 | #include <linux/gpio_keys.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; | |
32 | struct timer_list timer; | |
33 | }; | |
34 | ||
35 | struct gpio_keys_drvdata { | |
36 | struct input_dev *input; | |
37 | struct gpio_button_data data[0]; | |
38 | }; | |
39 | ||
40 | static void gpio_keys_report_event(struct gpio_keys_button *button, | |
41 | struct input_dev *input) | |
42 | { | |
43 | unsigned int type = button->type ?: EV_KEY; | |
44 | int state = (gpio_get_value(button->gpio) ? 1 : 0) ^ button->active_low; | |
45 | ||
46 | input_event(input, type, button->code, !!state); | |
47 | input_sync(input); | |
48 | } | |
49 | ||
50 | static void gpio_check_button(unsigned long _data) | |
51 | { | |
52 | struct gpio_button_data *data = (struct gpio_button_data *)_data; | |
53 | ||
54 | gpio_keys_report_event(data->button, data->input); | |
55 | } | |
56 | ||
78a56aab PB |
57 | static irqreturn_t gpio_keys_isr(int irq, void *dev_id) |
58 | { | |
78a56aab PB |
59 | struct platform_device *pdev = dev_id; |
60 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; | |
a33466e3 DB |
61 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); |
62 | int i; | |
78a56aab PB |
63 | |
64 | for (i = 0; i < pdata->nbuttons; i++) { | |
84767d00 | 65 | struct gpio_keys_button *button = &pdata->buttons[i]; |
84767d00 | 66 | |
a33466e3 DB |
67 | if (irq == gpio_to_irq(button->gpio)) { |
68 | struct gpio_button_data *bdata = &ddata->data[i]; | |
69 | ||
70 | if (button->debounce_interval) | |
71 | mod_timer(&bdata->timer, | |
72 | jiffies + | |
73 | msecs_to_jiffies(button->debounce_interval)); | |
74 | else | |
75 | gpio_keys_report_event(button, bdata->input); | |
78a56aab | 76 | |
1164ec1a | 77 | return IRQ_HANDLED; |
78a56aab PB |
78 | } |
79 | } | |
80 | ||
1164ec1a | 81 | return IRQ_NONE; |
78a56aab PB |
82 | } |
83 | ||
84 | static int __devinit gpio_keys_probe(struct platform_device *pdev) | |
85 | { | |
86 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; | |
a33466e3 | 87 | struct gpio_keys_drvdata *ddata; |
78a56aab PB |
88 | struct input_dev *input; |
89 | int i, error; | |
e15b0213 | 90 | int wakeup = 0; |
78a56aab | 91 | |
a33466e3 DB |
92 | ddata = kzalloc(sizeof(struct gpio_keys_drvdata) + |
93 | pdata->nbuttons * sizeof(struct gpio_button_data), | |
94 | GFP_KERNEL); | |
78a56aab | 95 | input = input_allocate_device(); |
a33466e3 DB |
96 | if (!ddata || !input) { |
97 | error = -ENOMEM; | |
98 | goto fail1; | |
99 | } | |
78a56aab | 100 | |
a33466e3 | 101 | platform_set_drvdata(pdev, ddata); |
78a56aab PB |
102 | |
103 | input->name = pdev->name; | |
104 | input->phys = "gpio-keys/input0"; | |
469ba4df | 105 | input->dev.parent = &pdev->dev; |
78a56aab PB |
106 | |
107 | input->id.bustype = BUS_HOST; | |
108 | input->id.vendor = 0x0001; | |
109 | input->id.product = 0x0001; | |
110 | input->id.version = 0x0100; | |
111 | ||
a33466e3 DB |
112 | ddata->input = input; |
113 | ||
78a56aab | 114 | for (i = 0; i < pdata->nbuttons; i++) { |
84767d00 | 115 | struct gpio_keys_button *button = &pdata->buttons[i]; |
a33466e3 | 116 | struct gpio_button_data *bdata = &ddata->data[i]; |
6a2e3911 | 117 | int irq; |
84767d00 | 118 | unsigned int type = button->type ?: EV_KEY; |
78a56aab | 119 | |
a33466e3 DB |
120 | bdata->input = input; |
121 | setup_timer(&bdata->timer, | |
122 | gpio_check_button, (unsigned long)bdata); | |
123 | ||
6a2e3911 HVR |
124 | error = gpio_request(button->gpio, button->desc ?: "gpio_keys"); |
125 | if (error < 0) { | |
126 | pr_err("gpio-keys: failed to request GPIO %d," | |
127 | " error %d\n", button->gpio, error); | |
a33466e3 | 128 | goto fail2; |
6a2e3911 HVR |
129 | } |
130 | ||
131 | error = gpio_direction_input(button->gpio); | |
132 | if (error < 0) { | |
133 | pr_err("gpio-keys: failed to configure input" | |
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; | |
6a2e3911 HVR |
143 | pr_err("gpio-keys: 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, | |
151 | IRQF_SAMPLE_RANDOM | IRQF_TRIGGER_RISING | | |
152 | IRQF_TRIGGER_FALLING, | |
153 | button->desc ? button->desc : "gpio_keys", | |
154 | pdev); | |
78a56aab | 155 | if (error) { |
6a2e3911 | 156 | pr_err("gpio-keys: 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) { | |
6a2e3911 | 170 | pr_err("gpio-keys: 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) { |
0d98f6bb | 181 | free_irq(gpio_to_irq(pdata->buttons[i].gpio), pdev); |
a33466e3 DB |
182 | if (pdata->buttons[i].debounce_interval) |
183 | del_timer_sync(&ddata->data[i].timer); | |
6a2e3911 HVR |
184 | gpio_free(pdata->buttons[i].gpio); |
185 | } | |
78a56aab | 186 | |
006df302 | 187 | platform_set_drvdata(pdev, NULL); |
a33466e3 | 188 | fail1: |
78a56aab | 189 | input_free_device(input); |
a33466e3 | 190 | kfree(ddata); |
78a56aab PB |
191 | |
192 | return error; | |
193 | } | |
194 | ||
195 | static int __devexit gpio_keys_remove(struct platform_device *pdev) | |
196 | { | |
197 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; | |
a33466e3 DB |
198 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); |
199 | struct input_dev *input = ddata->input; | |
78a56aab PB |
200 | int i; |
201 | ||
e15b0213 AS |
202 | device_init_wakeup(&pdev->dev, 0); |
203 | ||
78a56aab | 204 | for (i = 0; i < pdata->nbuttons; i++) { |
0d98f6bb | 205 | int irq = gpio_to_irq(pdata->buttons[i].gpio); |
78a56aab | 206 | free_irq(irq, pdev); |
a33466e3 DB |
207 | if (pdata->buttons[i].debounce_interval) |
208 | del_timer_sync(&ddata->data[i].timer); | |
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 | ||
78a56aab PB |
259 | struct platform_driver gpio_keys_device_driver = { |
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"); |