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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> |
78a56aab | 25 | |
0d98f6bb | 26 | #include <asm/gpio.h> |
78a56aab | 27 | |
a33466e3 DES |
28 | struct gpio_button_data { |
29 | struct gpio_keys_button *button; | |
30 | struct input_dev *input; | |
31 | struct timer_list timer; | |
32 | }; | |
33 | ||
34 | struct gpio_keys_drvdata { | |
35 | struct input_dev *input; | |
36 | struct gpio_button_data data[0]; | |
37 | }; | |
38 | ||
ce25d7e9 | 39 | static void gpio_keys_report_event(struct gpio_button_data *bdata) |
a33466e3 | 40 | { |
ce25d7e9 UKK |
41 | struct gpio_keys_button *button = bdata->button; |
42 | struct input_dev *input = bdata->input; | |
a33466e3 DES |
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 | ||
ce25d7e9 | 54 | gpio_keys_report_event(data); |
a33466e3 DES |
55 | } |
56 | ||
78a56aab PB |
57 | static irqreturn_t gpio_keys_isr(int irq, void *dev_id) |
58 | { | |
57ffe9d5 UKK |
59 | struct gpio_button_data *bdata = dev_id; |
60 | struct gpio_keys_button *button = bdata->button; | |
78a56aab | 61 | |
57ffe9d5 | 62 | BUG_ON(irq != gpio_to_irq(button->gpio)); |
84767d00 | 63 | |
57ffe9d5 UKK |
64 | if (button->debounce_interval) |
65 | mod_timer(&bdata->timer, | |
66 | jiffies + msecs_to_jiffies(button->debounce_interval)); | |
67 | else | |
ce25d7e9 | 68 | gpio_keys_report_event(bdata); |
78a56aab | 69 | |
57ffe9d5 | 70 | return IRQ_HANDLED; |
78a56aab PB |
71 | } |
72 | ||
73 | static int __devinit gpio_keys_probe(struct platform_device *pdev) | |
74 | { | |
75 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; | |
a33466e3 | 76 | struct gpio_keys_drvdata *ddata; |
78a56aab PB |
77 | struct input_dev *input; |
78 | int i, error; | |
e15b0213 | 79 | int wakeup = 0; |
78a56aab | 80 | |
a33466e3 DES |
81 | ddata = kzalloc(sizeof(struct gpio_keys_drvdata) + |
82 | pdata->nbuttons * sizeof(struct gpio_button_data), | |
83 | GFP_KERNEL); | |
78a56aab | 84 | input = input_allocate_device(); |
a33466e3 DES |
85 | if (!ddata || !input) { |
86 | error = -ENOMEM; | |
87 | goto fail1; | |
88 | } | |
78a56aab | 89 | |
a33466e3 | 90 | platform_set_drvdata(pdev, ddata); |
78a56aab PB |
91 | |
92 | input->name = pdev->name; | |
93 | input->phys = "gpio-keys/input0"; | |
469ba4df | 94 | input->dev.parent = &pdev->dev; |
78a56aab PB |
95 | |
96 | input->id.bustype = BUS_HOST; | |
97 | input->id.vendor = 0x0001; | |
98 | input->id.product = 0x0001; | |
99 | input->id.version = 0x0100; | |
100 | ||
a33466e3 DES |
101 | ddata->input = input; |
102 | ||
78a56aab | 103 | for (i = 0; i < pdata->nbuttons; i++) { |
84767d00 | 104 | struct gpio_keys_button *button = &pdata->buttons[i]; |
a33466e3 | 105 | struct gpio_button_data *bdata = &ddata->data[i]; |
6a2e3911 | 106 | int irq; |
84767d00 | 107 | unsigned int type = button->type ?: EV_KEY; |
78a56aab | 108 | |
a33466e3 | 109 | bdata->input = input; |
74dd4393 | 110 | bdata->button = button; |
a33466e3 DES |
111 | setup_timer(&bdata->timer, |
112 | gpio_check_button, (unsigned long)bdata); | |
113 | ||
6a2e3911 HVR |
114 | error = gpio_request(button->gpio, button->desc ?: "gpio_keys"); |
115 | if (error < 0) { | |
116 | pr_err("gpio-keys: failed to request GPIO %d," | |
117 | " error %d\n", button->gpio, error); | |
a33466e3 | 118 | goto fail2; |
6a2e3911 HVR |
119 | } |
120 | ||
121 | error = gpio_direction_input(button->gpio); | |
122 | if (error < 0) { | |
123 | pr_err("gpio-keys: failed to configure input" | |
124 | " direction for GPIO %d, error %d\n", | |
125 | button->gpio, error); | |
126 | gpio_free(button->gpio); | |
a33466e3 | 127 | goto fail2; |
6a2e3911 HVR |
128 | } |
129 | ||
130 | irq = gpio_to_irq(button->gpio); | |
006df302 AS |
131 | if (irq < 0) { |
132 | error = irq; | |
6a2e3911 HVR |
133 | pr_err("gpio-keys: Unable to get irq number" |
134 | " for GPIO %d, error %d\n", | |
006df302 | 135 | button->gpio, error); |
6a2e3911 | 136 | gpio_free(button->gpio); |
a33466e3 | 137 | goto fail2; |
006df302 AS |
138 | } |
139 | ||
140 | error = request_irq(irq, gpio_keys_isr, | |
141 | IRQF_SAMPLE_RANDOM | IRQF_TRIGGER_RISING | | |
142 | IRQF_TRIGGER_FALLING, | |
143 | button->desc ? button->desc : "gpio_keys", | |
57ffe9d5 | 144 | bdata); |
78a56aab | 145 | if (error) { |
6a2e3911 | 146 | pr_err("gpio-keys: Unable to claim irq %d; error %d\n", |
0d98f6bb | 147 | irq, error); |
6a2e3911 | 148 | gpio_free(button->gpio); |
a33466e3 | 149 | goto fail2; |
78a56aab | 150 | } |
84767d00 | 151 | |
e15b0213 AS |
152 | if (button->wakeup) |
153 | wakeup = 1; | |
154 | ||
84767d00 | 155 | input_set_capability(input, type, button->code); |
78a56aab PB |
156 | } |
157 | ||
158 | error = input_register_device(input); | |
159 | if (error) { | |
6a2e3911 | 160 | pr_err("gpio-keys: Unable to register input device, " |
006df302 | 161 | "error: %d\n", error); |
a33466e3 | 162 | goto fail2; |
78a56aab PB |
163 | } |
164 | ||
e15b0213 AS |
165 | device_init_wakeup(&pdev->dev, wakeup); |
166 | ||
78a56aab PB |
167 | return 0; |
168 | ||
a33466e3 | 169 | fail2: |
6a2e3911 | 170 | while (--i >= 0) { |
57ffe9d5 | 171 | free_irq(gpio_to_irq(pdata->buttons[i].gpio), &ddata->data[i]); |
a33466e3 DES |
172 | if (pdata->buttons[i].debounce_interval) |
173 | del_timer_sync(&ddata->data[i].timer); | |
6a2e3911 HVR |
174 | gpio_free(pdata->buttons[i].gpio); |
175 | } | |
78a56aab | 176 | |
006df302 | 177 | platform_set_drvdata(pdev, NULL); |
a33466e3 | 178 | fail1: |
78a56aab | 179 | input_free_device(input); |
a33466e3 | 180 | kfree(ddata); |
78a56aab PB |
181 | |
182 | return error; | |
183 | } | |
184 | ||
185 | static int __devexit gpio_keys_remove(struct platform_device *pdev) | |
186 | { | |
187 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; | |
a33466e3 DES |
188 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); |
189 | struct input_dev *input = ddata->input; | |
78a56aab PB |
190 | int i; |
191 | ||
e15b0213 AS |
192 | device_init_wakeup(&pdev->dev, 0); |
193 | ||
78a56aab | 194 | for (i = 0; i < pdata->nbuttons; i++) { |
0d98f6bb | 195 | int irq = gpio_to_irq(pdata->buttons[i].gpio); |
57ffe9d5 | 196 | free_irq(irq, &ddata->data[i]); |
a33466e3 DES |
197 | if (pdata->buttons[i].debounce_interval) |
198 | del_timer_sync(&ddata->data[i].timer); | |
6a2e3911 | 199 | gpio_free(pdata->buttons[i].gpio); |
78a56aab PB |
200 | } |
201 | ||
202 | input_unregister_device(input); | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
e15b0213 AS |
207 | |
208 | #ifdef CONFIG_PM | |
209 | static int gpio_keys_suspend(struct platform_device *pdev, pm_message_t state) | |
210 | { | |
211 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; | |
212 | int i; | |
213 | ||
214 | if (device_may_wakeup(&pdev->dev)) { | |
215 | for (i = 0; i < pdata->nbuttons; i++) { | |
216 | struct gpio_keys_button *button = &pdata->buttons[i]; | |
217 | if (button->wakeup) { | |
218 | int irq = gpio_to_irq(button->gpio); | |
219 | enable_irq_wake(irq); | |
220 | } | |
221 | } | |
222 | } | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | static int gpio_keys_resume(struct platform_device *pdev) | |
228 | { | |
229 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; | |
230 | int i; | |
231 | ||
232 | if (device_may_wakeup(&pdev->dev)) { | |
233 | for (i = 0; i < pdata->nbuttons; i++) { | |
234 | struct gpio_keys_button *button = &pdata->buttons[i]; | |
235 | if (button->wakeup) { | |
236 | int irq = gpio_to_irq(button->gpio); | |
237 | disable_irq_wake(irq); | |
238 | } | |
239 | } | |
240 | } | |
241 | ||
242 | return 0; | |
243 | } | |
244 | #else | |
245 | #define gpio_keys_suspend NULL | |
246 | #define gpio_keys_resume NULL | |
247 | #endif | |
248 | ||
9b07044c | 249 | static struct platform_driver gpio_keys_device_driver = { |
78a56aab PB |
250 | .probe = gpio_keys_probe, |
251 | .remove = __devexit_p(gpio_keys_remove), | |
e15b0213 AS |
252 | .suspend = gpio_keys_suspend, |
253 | .resume = gpio_keys_resume, | |
78a56aab PB |
254 | .driver = { |
255 | .name = "gpio-keys", | |
d7b5247b | 256 | .owner = THIS_MODULE, |
78a56aab PB |
257 | } |
258 | }; | |
259 | ||
260 | static int __init gpio_keys_init(void) | |
261 | { | |
262 | return platform_driver_register(&gpio_keys_device_driver); | |
263 | } | |
264 | ||
265 | static void __exit gpio_keys_exit(void) | |
266 | { | |
267 | platform_driver_unregister(&gpio_keys_device_driver); | |
268 | } | |
269 | ||
270 | module_init(gpio_keys_init); | |
271 | module_exit(gpio_keys_exit); | |
272 | ||
273 | MODULE_LICENSE("GPL"); | |
274 | MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>"); | |
275 | MODULE_DESCRIPTION("Keyboard driver for CPU GPIOs"); | |
d7b5247b | 276 | MODULE_ALIAS("platform:gpio-keys"); |