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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> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
78a56aab PB |
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> |
da0d03fe | 26 | #include <linux/workqueue.h> |
111bc59c | 27 | #include <linux/gpio.h> |
78a56aab | 28 | |
a33466e3 DES |
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; |
28ed684f | 34 | int timer_debounce; /* in msecs */ |
9e3af04f | 35 | bool disabled; |
a33466e3 DES |
36 | }; |
37 | ||
38 | struct gpio_keys_drvdata { | |
39 | struct input_dev *input; | |
9e3af04f MW |
40 | struct mutex disable_lock; |
41 | unsigned int n_buttons; | |
a33466e3 DES |
42 | struct gpio_button_data data[0]; |
43 | }; | |
44 | ||
9e3af04f MW |
45 | /* |
46 | * SYSFS interface for enabling/disabling keys and switches: | |
47 | * | |
48 | * There are 4 attributes under /sys/devices/platform/gpio-keys/ | |
49 | * keys [ro] - bitmap of keys (EV_KEY) which can be | |
50 | * disabled | |
51 | * switches [ro] - bitmap of switches (EV_SW) which can be | |
52 | * disabled | |
53 | * disabled_keys [rw] - bitmap of keys currently disabled | |
54 | * disabled_switches [rw] - bitmap of switches currently disabled | |
55 | * | |
56 | * Userland can change these values and hence disable event generation | |
57 | * for each key (or switch). Disabling a key means its interrupt line | |
58 | * is disabled. | |
59 | * | |
60 | * For example, if we have following switches set up as gpio-keys: | |
61 | * SW_DOCK = 5 | |
62 | * SW_CAMERA_LENS_COVER = 9 | |
63 | * SW_KEYPAD_SLIDE = 10 | |
64 | * SW_FRONT_PROXIMITY = 11 | |
65 | * This is read from switches: | |
66 | * 11-9,5 | |
67 | * Next we want to disable proximity (11) and dock (5), we write: | |
68 | * 11,5 | |
69 | * to file disabled_switches. Now proximity and dock IRQs are disabled. | |
70 | * This can be verified by reading the file disabled_switches: | |
71 | * 11,5 | |
72 | * If we now want to enable proximity (11) switch we write: | |
73 | * 5 | |
74 | * to disabled_switches. | |
75 | * | |
76 | * We can disable only those keys which don't allow sharing the irq. | |
77 | */ | |
78 | ||
79 | /** | |
80 | * get_n_events_by_type() - returns maximum number of events per @type | |
81 | * @type: type of button (%EV_KEY, %EV_SW) | |
82 | * | |
83 | * Return value of this function can be used to allocate bitmap | |
84 | * large enough to hold all bits for given type. | |
85 | */ | |
86 | static inline int get_n_events_by_type(int type) | |
87 | { | |
88 | BUG_ON(type != EV_SW && type != EV_KEY); | |
89 | ||
90 | return (type == EV_KEY) ? KEY_CNT : SW_CNT; | |
91 | } | |
92 | ||
93 | /** | |
94 | * gpio_keys_disable_button() - disables given GPIO button | |
95 | * @bdata: button data for button to be disabled | |
96 | * | |
97 | * Disables button pointed by @bdata. This is done by masking | |
98 | * IRQ line. After this function is called, button won't generate | |
99 | * input events anymore. Note that one can only disable buttons | |
100 | * that don't share IRQs. | |
101 | * | |
102 | * Make sure that @bdata->disable_lock is locked when entering | |
103 | * this function to avoid races when concurrent threads are | |
104 | * disabling buttons at the same time. | |
105 | */ | |
106 | static void gpio_keys_disable_button(struct gpio_button_data *bdata) | |
107 | { | |
108 | if (!bdata->disabled) { | |
109 | /* | |
110 | * Disable IRQ and possible debouncing timer. | |
111 | */ | |
112 | disable_irq(gpio_to_irq(bdata->button->gpio)); | |
28ed684f | 113 | if (bdata->timer_debounce) |
9e3af04f MW |
114 | del_timer_sync(&bdata->timer); |
115 | ||
116 | bdata->disabled = true; | |
117 | } | |
118 | } | |
119 | ||
120 | /** | |
121 | * gpio_keys_enable_button() - enables given GPIO button | |
122 | * @bdata: button data for button to be disabled | |
123 | * | |
124 | * Enables given button pointed by @bdata. | |
125 | * | |
126 | * Make sure that @bdata->disable_lock is locked when entering | |
127 | * this function to avoid races with concurrent threads trying | |
128 | * to enable the same button at the same time. | |
129 | */ | |
130 | static void gpio_keys_enable_button(struct gpio_button_data *bdata) | |
131 | { | |
132 | if (bdata->disabled) { | |
133 | enable_irq(gpio_to_irq(bdata->button->gpio)); | |
134 | bdata->disabled = false; | |
135 | } | |
136 | } | |
137 | ||
138 | /** | |
139 | * gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons | |
140 | * @ddata: pointer to drvdata | |
141 | * @buf: buffer where stringified bitmap is written | |
142 | * @type: button type (%EV_KEY, %EV_SW) | |
143 | * @only_disabled: does caller want only those buttons that are | |
144 | * currently disabled or all buttons that can be | |
145 | * disabled | |
146 | * | |
147 | * This function writes buttons that can be disabled to @buf. If | |
148 | * @only_disabled is true, then @buf contains only those buttons | |
149 | * that are currently disabled. Returns 0 on success or negative | |
150 | * errno on failure. | |
151 | */ | |
152 | static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata, | |
153 | char *buf, unsigned int type, | |
154 | bool only_disabled) | |
155 | { | |
156 | int n_events = get_n_events_by_type(type); | |
157 | unsigned long *bits; | |
158 | ssize_t ret; | |
159 | int i; | |
160 | ||
161 | bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); | |
162 | if (!bits) | |
163 | return -ENOMEM; | |
164 | ||
165 | for (i = 0; i < ddata->n_buttons; i++) { | |
166 | struct gpio_button_data *bdata = &ddata->data[i]; | |
167 | ||
168 | if (bdata->button->type != type) | |
169 | continue; | |
170 | ||
171 | if (only_disabled && !bdata->disabled) | |
172 | continue; | |
173 | ||
174 | __set_bit(bdata->button->code, bits); | |
175 | } | |
176 | ||
177 | ret = bitmap_scnlistprintf(buf, PAGE_SIZE - 2, bits, n_events); | |
178 | buf[ret++] = '\n'; | |
179 | buf[ret] = '\0'; | |
180 | ||
181 | kfree(bits); | |
182 | ||
183 | return ret; | |
184 | } | |
185 | ||
186 | /** | |
187 | * gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap | |
188 | * @ddata: pointer to drvdata | |
189 | * @buf: buffer from userspace that contains stringified bitmap | |
190 | * @type: button type (%EV_KEY, %EV_SW) | |
191 | * | |
192 | * This function parses stringified bitmap from @buf and disables/enables | |
193 | * GPIO buttons accordinly. Returns 0 on success and negative error | |
194 | * on failure. | |
195 | */ | |
196 | static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata, | |
197 | const char *buf, unsigned int type) | |
198 | { | |
199 | int n_events = get_n_events_by_type(type); | |
200 | unsigned long *bits; | |
201 | ssize_t error; | |
202 | int i; | |
203 | ||
204 | bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); | |
205 | if (!bits) | |
206 | return -ENOMEM; | |
207 | ||
208 | error = bitmap_parselist(buf, bits, n_events); | |
209 | if (error) | |
210 | goto out; | |
211 | ||
212 | /* First validate */ | |
213 | for (i = 0; i < ddata->n_buttons; i++) { | |
214 | struct gpio_button_data *bdata = &ddata->data[i]; | |
215 | ||
216 | if (bdata->button->type != type) | |
217 | continue; | |
218 | ||
219 | if (test_bit(bdata->button->code, bits) && | |
220 | !bdata->button->can_disable) { | |
221 | error = -EINVAL; | |
222 | goto out; | |
223 | } | |
224 | } | |
225 | ||
226 | mutex_lock(&ddata->disable_lock); | |
227 | ||
228 | for (i = 0; i < ddata->n_buttons; i++) { | |
229 | struct gpio_button_data *bdata = &ddata->data[i]; | |
230 | ||
231 | if (bdata->button->type != type) | |
232 | continue; | |
233 | ||
234 | if (test_bit(bdata->button->code, bits)) | |
235 | gpio_keys_disable_button(bdata); | |
236 | else | |
237 | gpio_keys_enable_button(bdata); | |
238 | } | |
239 | ||
240 | mutex_unlock(&ddata->disable_lock); | |
241 | ||
242 | out: | |
243 | kfree(bits); | |
244 | return error; | |
245 | } | |
246 | ||
247 | #define ATTR_SHOW_FN(name, type, only_disabled) \ | |
248 | static ssize_t gpio_keys_show_##name(struct device *dev, \ | |
249 | struct device_attribute *attr, \ | |
250 | char *buf) \ | |
251 | { \ | |
252 | struct platform_device *pdev = to_platform_device(dev); \ | |
253 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ | |
254 | \ | |
255 | return gpio_keys_attr_show_helper(ddata, buf, \ | |
256 | type, only_disabled); \ | |
257 | } | |
258 | ||
259 | ATTR_SHOW_FN(keys, EV_KEY, false); | |
260 | ATTR_SHOW_FN(switches, EV_SW, false); | |
261 | ATTR_SHOW_FN(disabled_keys, EV_KEY, true); | |
262 | ATTR_SHOW_FN(disabled_switches, EV_SW, true); | |
263 | ||
264 | /* | |
265 | * ATTRIBUTES: | |
266 | * | |
267 | * /sys/devices/platform/gpio-keys/keys [ro] | |
268 | * /sys/devices/platform/gpio-keys/switches [ro] | |
269 | */ | |
270 | static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL); | |
271 | static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL); | |
272 | ||
273 | #define ATTR_STORE_FN(name, type) \ | |
274 | static ssize_t gpio_keys_store_##name(struct device *dev, \ | |
275 | struct device_attribute *attr, \ | |
276 | const char *buf, \ | |
277 | size_t count) \ | |
278 | { \ | |
279 | struct platform_device *pdev = to_platform_device(dev); \ | |
280 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ | |
281 | ssize_t error; \ | |
282 | \ | |
283 | error = gpio_keys_attr_store_helper(ddata, buf, type); \ | |
284 | if (error) \ | |
285 | return error; \ | |
286 | \ | |
287 | return count; \ | |
288 | } | |
289 | ||
290 | ATTR_STORE_FN(disabled_keys, EV_KEY); | |
291 | ATTR_STORE_FN(disabled_switches, EV_SW); | |
292 | ||
293 | /* | |
294 | * ATTRIBUTES: | |
295 | * | |
296 | * /sys/devices/platform/gpio-keys/disabled_keys [rw] | |
297 | * /sys/devices/platform/gpio-keys/disables_switches [rw] | |
298 | */ | |
299 | static DEVICE_ATTR(disabled_keys, S_IWUSR | S_IRUGO, | |
300 | gpio_keys_show_disabled_keys, | |
301 | gpio_keys_store_disabled_keys); | |
302 | static DEVICE_ATTR(disabled_switches, S_IWUSR | S_IRUGO, | |
303 | gpio_keys_show_disabled_switches, | |
304 | gpio_keys_store_disabled_switches); | |
305 | ||
306 | static struct attribute *gpio_keys_attrs[] = { | |
307 | &dev_attr_keys.attr, | |
308 | &dev_attr_switches.attr, | |
309 | &dev_attr_disabled_keys.attr, | |
310 | &dev_attr_disabled_switches.attr, | |
311 | NULL, | |
312 | }; | |
313 | ||
314 | static struct attribute_group gpio_keys_attr_group = { | |
315 | .attrs = gpio_keys_attrs, | |
316 | }; | |
317 | ||
6ee88d71 | 318 | static void gpio_keys_report_event(struct gpio_button_data *bdata) |
a33466e3 | 319 | { |
ce25d7e9 UKK |
320 | struct gpio_keys_button *button = bdata->button; |
321 | struct input_dev *input = bdata->input; | |
a33466e3 DES |
322 | unsigned int type = button->type ?: EV_KEY; |
323 | int state = (gpio_get_value(button->gpio) ? 1 : 0) ^ button->active_low; | |
324 | ||
325 | input_event(input, type, button->code, !!state); | |
326 | input_sync(input); | |
327 | } | |
328 | ||
6ee88d71 DM |
329 | static void gpio_keys_work_func(struct work_struct *work) |
330 | { | |
331 | struct gpio_button_data *bdata = | |
332 | container_of(work, struct gpio_button_data, work); | |
333 | ||
334 | gpio_keys_report_event(bdata); | |
335 | } | |
336 | ||
da0d03fe | 337 | static void gpio_keys_timer(unsigned long _data) |
ca865a77 JN |
338 | { |
339 | struct gpio_button_data *data = (struct gpio_button_data *)_data; | |
340 | ||
da0d03fe | 341 | schedule_work(&data->work); |
ca865a77 JN |
342 | } |
343 | ||
78a56aab PB |
344 | static irqreturn_t gpio_keys_isr(int irq, void *dev_id) |
345 | { | |
57ffe9d5 UKK |
346 | struct gpio_button_data *bdata = dev_id; |
347 | struct gpio_keys_button *button = bdata->button; | |
78a56aab | 348 | |
57ffe9d5 | 349 | BUG_ON(irq != gpio_to_irq(button->gpio)); |
84767d00 | 350 | |
28ed684f | 351 | if (bdata->timer_debounce) |
ca865a77 | 352 | mod_timer(&bdata->timer, |
28ed684f | 353 | jiffies + msecs_to_jiffies(bdata->timer_debounce)); |
ca865a77 | 354 | else |
da0d03fe | 355 | schedule_work(&bdata->work); |
78a56aab | 356 | |
57ffe9d5 | 357 | return IRQ_HANDLED; |
78a56aab PB |
358 | } |
359 | ||
9e3af04f | 360 | static int __devinit gpio_keys_setup_key(struct platform_device *pdev, |
bc8f1eaf BD |
361 | struct gpio_button_data *bdata, |
362 | struct gpio_keys_button *button) | |
363 | { | |
364 | char *desc = button->desc ? button->desc : "gpio_keys"; | |
9e3af04f MW |
365 | struct device *dev = &pdev->dev; |
366 | unsigned long irqflags; | |
bc8f1eaf BD |
367 | int irq, error; |
368 | ||
369 | setup_timer(&bdata->timer, gpio_keys_timer, (unsigned long)bdata); | |
6ee88d71 | 370 | INIT_WORK(&bdata->work, gpio_keys_work_func); |
bc8f1eaf BD |
371 | |
372 | error = gpio_request(button->gpio, desc); | |
373 | if (error < 0) { | |
374 | dev_err(dev, "failed to request GPIO %d, error %d\n", | |
375 | button->gpio, error); | |
376 | goto fail2; | |
377 | } | |
378 | ||
379 | error = gpio_direction_input(button->gpio); | |
380 | if (error < 0) { | |
381 | dev_err(dev, "failed to configure" | |
382 | " direction for GPIO %d, error %d\n", | |
383 | button->gpio, error); | |
384 | goto fail3; | |
385 | } | |
386 | ||
28ed684f GI |
387 | if (button->debounce_interval) { |
388 | error = gpio_set_debounce(button->gpio, | |
389 | button->debounce_interval * 1000); | |
390 | /* use timer if gpiolib doesn't provide debounce */ | |
391 | if (error < 0) | |
392 | bdata->timer_debounce = button->debounce_interval; | |
393 | } | |
394 | ||
bc8f1eaf BD |
395 | irq = gpio_to_irq(button->gpio); |
396 | if (irq < 0) { | |
397 | error = irq; | |
398 | dev_err(dev, "Unable to get irq number for GPIO %d, error %d\n", | |
399 | button->gpio, error); | |
400 | goto fail3; | |
401 | } | |
402 | ||
9e3af04f MW |
403 | irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING; |
404 | /* | |
405 | * If platform has specified that the button can be disabled, | |
406 | * we don't want it to share the interrupt line. | |
407 | */ | |
408 | if (!button->can_disable) | |
409 | irqflags |= IRQF_SHARED; | |
410 | ||
411 | error = request_irq(irq, gpio_keys_isr, irqflags, desc, bdata); | |
bc8f1eaf BD |
412 | if (error) { |
413 | dev_err(dev, "Unable to claim irq %d; error %d\n", | |
414 | irq, error); | |
415 | goto fail3; | |
416 | } | |
417 | ||
418 | return 0; | |
419 | ||
420 | fail3: | |
421 | gpio_free(button->gpio); | |
422 | fail2: | |
423 | return error; | |
424 | } | |
425 | ||
78a56aab PB |
426 | static int __devinit gpio_keys_probe(struct platform_device *pdev) |
427 | { | |
428 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; | |
a33466e3 | 429 | struct gpio_keys_drvdata *ddata; |
db19fd8b | 430 | struct device *dev = &pdev->dev; |
78a56aab PB |
431 | struct input_dev *input; |
432 | int i, error; | |
e15b0213 | 433 | int wakeup = 0; |
78a56aab | 434 | |
a33466e3 DES |
435 | ddata = kzalloc(sizeof(struct gpio_keys_drvdata) + |
436 | pdata->nbuttons * sizeof(struct gpio_button_data), | |
437 | GFP_KERNEL); | |
78a56aab | 438 | input = input_allocate_device(); |
a33466e3 | 439 | if (!ddata || !input) { |
db19fd8b | 440 | dev_err(dev, "failed to allocate state\n"); |
a33466e3 DES |
441 | error = -ENOMEM; |
442 | goto fail1; | |
443 | } | |
78a56aab | 444 | |
9e3af04f MW |
445 | ddata->input = input; |
446 | ddata->n_buttons = pdata->nbuttons; | |
447 | mutex_init(&ddata->disable_lock); | |
448 | ||
a33466e3 | 449 | platform_set_drvdata(pdev, ddata); |
78a56aab PB |
450 | |
451 | input->name = pdev->name; | |
452 | input->phys = "gpio-keys/input0"; | |
469ba4df | 453 | input->dev.parent = &pdev->dev; |
78a56aab PB |
454 | |
455 | input->id.bustype = BUS_HOST; | |
456 | input->id.vendor = 0x0001; | |
457 | input->id.product = 0x0001; | |
458 | input->id.version = 0x0100; | |
459 | ||
b67b4b11 DC |
460 | /* Enable auto repeat feature of Linux input subsystem */ |
461 | if (pdata->rep) | |
462 | __set_bit(EV_REP, input->evbit); | |
463 | ||
78a56aab | 464 | for (i = 0; i < pdata->nbuttons; i++) { |
84767d00 | 465 | struct gpio_keys_button *button = &pdata->buttons[i]; |
a33466e3 | 466 | struct gpio_button_data *bdata = &ddata->data[i]; |
84767d00 | 467 | unsigned int type = button->type ?: EV_KEY; |
78a56aab | 468 | |
a33466e3 | 469 | bdata->input = input; |
74dd4393 | 470 | bdata->button = button; |
bc8f1eaf | 471 | |
9e3af04f | 472 | error = gpio_keys_setup_key(pdev, bdata, button); |
bc8f1eaf | 473 | if (error) |
a33466e3 | 474 | goto fail2; |
84767d00 | 475 | |
e15b0213 AS |
476 | if (button->wakeup) |
477 | wakeup = 1; | |
478 | ||
84767d00 | 479 | input_set_capability(input, type, button->code); |
78a56aab PB |
480 | } |
481 | ||
9e3af04f | 482 | error = sysfs_create_group(&pdev->dev.kobj, &gpio_keys_attr_group); |
78a56aab | 483 | if (error) { |
9e3af04f MW |
484 | dev_err(dev, "Unable to export keys/switches, error: %d\n", |
485 | error); | |
a33466e3 | 486 | goto fail2; |
78a56aab PB |
487 | } |
488 | ||
9e3af04f MW |
489 | error = input_register_device(input); |
490 | if (error) { | |
491 | dev_err(dev, "Unable to register input device, error: %d\n", | |
492 | error); | |
493 | goto fail3; | |
494 | } | |
495 | ||
6ee88d71 DM |
496 | /* get current state of buttons */ |
497 | for (i = 0; i < pdata->nbuttons; i++) | |
498 | gpio_keys_report_event(&ddata->data[i]); | |
499 | input_sync(input); | |
500 | ||
e15b0213 AS |
501 | device_init_wakeup(&pdev->dev, wakeup); |
502 | ||
78a56aab PB |
503 | return 0; |
504 | ||
9e3af04f MW |
505 | fail3: |
506 | sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); | |
a33466e3 | 507 | fail2: |
6a2e3911 | 508 | while (--i >= 0) { |
57ffe9d5 | 509 | free_irq(gpio_to_irq(pdata->buttons[i].gpio), &ddata->data[i]); |
28ed684f | 510 | if (ddata->data[i].timer_debounce) |
ca865a77 | 511 | del_timer_sync(&ddata->data[i].timer); |
da0d03fe | 512 | cancel_work_sync(&ddata->data[i].work); |
6a2e3911 HVR |
513 | gpio_free(pdata->buttons[i].gpio); |
514 | } | |
78a56aab | 515 | |
006df302 | 516 | platform_set_drvdata(pdev, NULL); |
a33466e3 | 517 | fail1: |
78a56aab | 518 | input_free_device(input); |
a33466e3 | 519 | kfree(ddata); |
78a56aab PB |
520 | |
521 | return error; | |
522 | } | |
523 | ||
524 | static int __devexit gpio_keys_remove(struct platform_device *pdev) | |
525 | { | |
526 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; | |
a33466e3 DES |
527 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); |
528 | struct input_dev *input = ddata->input; | |
78a56aab PB |
529 | int i; |
530 | ||
9e3af04f MW |
531 | sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); |
532 | ||
e15b0213 AS |
533 | device_init_wakeup(&pdev->dev, 0); |
534 | ||
78a56aab | 535 | for (i = 0; i < pdata->nbuttons; i++) { |
0d98f6bb | 536 | int irq = gpio_to_irq(pdata->buttons[i].gpio); |
57ffe9d5 | 537 | free_irq(irq, &ddata->data[i]); |
28ed684f | 538 | if (ddata->data[i].timer_debounce) |
ca865a77 | 539 | del_timer_sync(&ddata->data[i].timer); |
da0d03fe | 540 | cancel_work_sync(&ddata->data[i].work); |
6a2e3911 | 541 | gpio_free(pdata->buttons[i].gpio); |
78a56aab PB |
542 | } |
543 | ||
544 | input_unregister_device(input); | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
e15b0213 AS |
549 | |
550 | #ifdef CONFIG_PM | |
ae78e0e0 | 551 | static int gpio_keys_suspend(struct device *dev) |
e15b0213 | 552 | { |
ae78e0e0 | 553 | struct platform_device *pdev = to_platform_device(dev); |
e15b0213 AS |
554 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; |
555 | int i; | |
556 | ||
557 | if (device_may_wakeup(&pdev->dev)) { | |
558 | for (i = 0; i < pdata->nbuttons; i++) { | |
559 | struct gpio_keys_button *button = &pdata->buttons[i]; | |
560 | if (button->wakeup) { | |
561 | int irq = gpio_to_irq(button->gpio); | |
562 | enable_irq_wake(irq); | |
563 | } | |
564 | } | |
565 | } | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
ae78e0e0 | 570 | static int gpio_keys_resume(struct device *dev) |
e15b0213 | 571 | { |
ae78e0e0 | 572 | struct platform_device *pdev = to_platform_device(dev); |
6ee88d71 | 573 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); |
e15b0213 AS |
574 | struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; |
575 | int i; | |
576 | ||
6ee88d71 DM |
577 | for (i = 0; i < pdata->nbuttons; i++) { |
578 | ||
579 | struct gpio_keys_button *button = &pdata->buttons[i]; | |
580 | if (button->wakeup && device_may_wakeup(&pdev->dev)) { | |
581 | int irq = gpio_to_irq(button->gpio); | |
582 | disable_irq_wake(irq); | |
e15b0213 | 583 | } |
6ee88d71 DM |
584 | |
585 | gpio_keys_report_event(&ddata->data[i]); | |
e15b0213 | 586 | } |
6ee88d71 | 587 | input_sync(ddata->input); |
e15b0213 AS |
588 | |
589 | return 0; | |
590 | } | |
ae78e0e0 MR |
591 | |
592 | static const struct dev_pm_ops gpio_keys_pm_ops = { | |
593 | .suspend = gpio_keys_suspend, | |
594 | .resume = gpio_keys_resume, | |
595 | }; | |
e15b0213 AS |
596 | #endif |
597 | ||
9b07044c | 598 | static struct platform_driver gpio_keys_device_driver = { |
78a56aab PB |
599 | .probe = gpio_keys_probe, |
600 | .remove = __devexit_p(gpio_keys_remove), | |
601 | .driver = { | |
602 | .name = "gpio-keys", | |
d7b5247b | 603 | .owner = THIS_MODULE, |
ae78e0e0 MR |
604 | #ifdef CONFIG_PM |
605 | .pm = &gpio_keys_pm_ops, | |
606 | #endif | |
78a56aab PB |
607 | } |
608 | }; | |
609 | ||
610 | static int __init gpio_keys_init(void) | |
611 | { | |
612 | return platform_driver_register(&gpio_keys_device_driver); | |
613 | } | |
614 | ||
615 | static void __exit gpio_keys_exit(void) | |
616 | { | |
617 | platform_driver_unregister(&gpio_keys_device_driver); | |
618 | } | |
619 | ||
620 | module_init(gpio_keys_init); | |
621 | module_exit(gpio_keys_exit); | |
622 | ||
623 | MODULE_LICENSE("GPL"); | |
624 | MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>"); | |
625 | MODULE_DESCRIPTION("Keyboard driver for CPU GPIOs"); | |
d7b5247b | 626 | MODULE_ALIAS("platform:gpio-keys"); |