1 /*
2 * Driver for keys on GPIO lines capable of generating interrupts.
3 *
4 * Copyright 2005 Phil Blundell
5 * Copyright 2010, 2011 David Jander <david@protonic.nl>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #include <linux/module.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/slab.h>
21 #include <linux/sysctl.h>
22 #include <linux/proc_fs.h>
23 #include <linux/delay.h>
24 #include <linux/platform_device.h>
25 #include <linux/input.h>
26 #include <linux/gpio_keys.h>
27 #include <linux/workqueue.h>
28 #include <linux/gpio.h>
29 #include <linux/of_platform.h>
30 #include <linux/of_gpio.h>
31 #include <linux/spinlock.h>
32
33 struct gpio_button_data {
34 const struct gpio_keys_button *button;
35 struct input_dev *input;
36 struct timer_list timer;
37 struct work_struct work;
38 unsigned int timer_debounce; /* in msecs */
39 unsigned int irq;
40 spinlock_t lock;
41 bool disabled;
42 bool key_pressed;
43 };
44
45 struct gpio_keys_drvdata {
46 struct input_dev *input;
47 struct mutex disable_lock;
48 unsigned int n_buttons;
49 int (*enable)(struct device *dev);
50 void (*disable)(struct device *dev);
51 struct gpio_button_data data[0];
52 };
53
54 /*
55 * SYSFS interface for enabling/disabling keys and switches:
56 *
57 * There are 4 attributes under /sys/devices/platform/gpio-keys/
58 * keys [ro] - bitmap of keys (EV_KEY) which can be
59 * disabled
60 * switches [ro] - bitmap of switches (EV_SW) which can be
61 * disabled
62 * disabled_keys [rw] - bitmap of keys currently disabled
63 * disabled_switches [rw] - bitmap of switches currently disabled
64 *
65 * Userland can change these values and hence disable event generation
66 * for each key (or switch). Disabling a key means its interrupt line
67 * is disabled.
68 *
69 * For example, if we have following switches set up as gpio-keys:
70 * SW_DOCK = 5
71 * SW_CAMERA_LENS_COVER = 9
72 * SW_KEYPAD_SLIDE = 10
73 * SW_FRONT_PROXIMITY = 11
74 * This is read from switches:
75 * 11-9,5
76 * Next we want to disable proximity (11) and dock (5), we write:
77 * 11,5
78 * to file disabled_switches. Now proximity and dock IRQs are disabled.
79 * This can be verified by reading the file disabled_switches:
80 * 11,5
81 * If we now want to enable proximity (11) switch we write:
82 * 5
83 * to disabled_switches.
84 *
85 * We can disable only those keys which don't allow sharing the irq.
86 */
87
88 /**
89 * get_n_events_by_type() - returns maximum number of events per @type
90 * @type: type of button (%EV_KEY, %EV_SW)
91 *
92 * Return value of this function can be used to allocate bitmap
93 * large enough to hold all bits for given type.
94 */
get_n_events_by_type(int type)95 static inline int get_n_events_by_type(int type)
96 {
97 BUG_ON(type != EV_SW && type != EV_KEY);
98
99 return (type == EV_KEY) ? KEY_CNT : SW_CNT;
100 }
101
102 /**
103 * gpio_keys_disable_button() - disables given GPIO button
104 * @bdata: button data for button to be disabled
105 *
106 * Disables button pointed by @bdata. This is done by masking
107 * IRQ line. After this function is called, button won't generate
108 * input events anymore. Note that one can only disable buttons
109 * that don't share IRQs.
110 *
111 * Make sure that @bdata->disable_lock is locked when entering
112 * this function to avoid races when concurrent threads are
113 * disabling buttons at the same time.
114 */
gpio_keys_disable_button(struct gpio_button_data * bdata)115 static void gpio_keys_disable_button(struct gpio_button_data *bdata)
116 {
117 if (!bdata->disabled) {
118 /*
119 * Disable IRQ and possible debouncing timer.
120 */
121 disable_irq(bdata->irq);
122 if (bdata->timer_debounce)
123 del_timer_sync(&bdata->timer);
124
125 bdata->disabled = true;
126 }
127 }
128
129 /**
130 * gpio_keys_enable_button() - enables given GPIO button
131 * @bdata: button data for button to be disabled
132 *
133 * Enables given button pointed by @bdata.
134 *
135 * Make sure that @bdata->disable_lock is locked when entering
136 * this function to avoid races with concurrent threads trying
137 * to enable the same button at the same time.
138 */
gpio_keys_enable_button(struct gpio_button_data * bdata)139 static void gpio_keys_enable_button(struct gpio_button_data *bdata)
140 {
141 if (bdata->disabled) {
142 enable_irq(bdata->irq);
143 bdata->disabled = false;
144 }
145 }
146
147 /**
148 * gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons
149 * @ddata: pointer to drvdata
150 * @buf: buffer where stringified bitmap is written
151 * @type: button type (%EV_KEY, %EV_SW)
152 * @only_disabled: does caller want only those buttons that are
153 * currently disabled or all buttons that can be
154 * disabled
155 *
156 * This function writes buttons that can be disabled to @buf. If
157 * @only_disabled is true, then @buf contains only those buttons
158 * that are currently disabled. Returns 0 on success or negative
159 * errno on failure.
160 */
gpio_keys_attr_show_helper(struct gpio_keys_drvdata * ddata,char * buf,unsigned int type,bool only_disabled)161 static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata,
162 char *buf, unsigned int type,
163 bool only_disabled)
164 {
165 int n_events = get_n_events_by_type(type);
166 unsigned long *bits;
167 ssize_t ret;
168 int i;
169
170 bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL);
171 if (!bits)
172 return -ENOMEM;
173
174 for (i = 0; i < ddata->n_buttons; i++) {
175 struct gpio_button_data *bdata = &ddata->data[i];
176
177 if (bdata->button->type != type)
178 continue;
179
180 if (only_disabled && !bdata->disabled)
181 continue;
182
183 __set_bit(bdata->button->code, bits);
184 }
185
186 ret = bitmap_scnlistprintf(buf, PAGE_SIZE - 2, bits, n_events);
187 buf[ret++] = '\n';
188 buf[ret] = '\0';
189
190 kfree(bits);
191
192 return ret;
193 }
194
195 /**
196 * gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap
197 * @ddata: pointer to drvdata
198 * @buf: buffer from userspace that contains stringified bitmap
199 * @type: button type (%EV_KEY, %EV_SW)
200 *
201 * This function parses stringified bitmap from @buf and disables/enables
202 * GPIO buttons accordingly. Returns 0 on success and negative error
203 * on failure.
204 */
gpio_keys_attr_store_helper(struct gpio_keys_drvdata * ddata,const char * buf,unsigned int type)205 static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata,
206 const char *buf, unsigned int type)
207 {
208 int n_events = get_n_events_by_type(type);
209 unsigned long *bits;
210 ssize_t error;
211 int i;
212
213 bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL);
214 if (!bits)
215 return -ENOMEM;
216
217 error = bitmap_parselist(buf, bits, n_events);
218 if (error)
219 goto out;
220
221 /* First validate */
222 for (i = 0; i < ddata->n_buttons; i++) {
223 struct gpio_button_data *bdata = &ddata->data[i];
224
225 if (bdata->button->type != type)
226 continue;
227
228 if (test_bit(bdata->button->code, bits) &&
229 !bdata->button->can_disable) {
230 error = -EINVAL;
231 goto out;
232 }
233 }
234
235 mutex_lock(&ddata->disable_lock);
236
237 for (i = 0; i < ddata->n_buttons; i++) {
238 struct gpio_button_data *bdata = &ddata->data[i];
239
240 if (bdata->button->type != type)
241 continue;
242
243 if (test_bit(bdata->button->code, bits))
244 gpio_keys_disable_button(bdata);
245 else
246 gpio_keys_enable_button(bdata);
247 }
248
249 mutex_unlock(&ddata->disable_lock);
250
251 out:
252 kfree(bits);
253 return error;
254 }
255
256 #define ATTR_SHOW_FN(name, type, only_disabled) \
257 static ssize_t gpio_keys_show_##name(struct device *dev, \
258 struct device_attribute *attr, \
259 char *buf) \
260 { \
261 struct platform_device *pdev = to_platform_device(dev); \
262 struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
263 \
264 return gpio_keys_attr_show_helper(ddata, buf, \
265 type, only_disabled); \
266 }
267
268 ATTR_SHOW_FN(keys, EV_KEY, false);
269 ATTR_SHOW_FN(switches, EV_SW, false);
270 ATTR_SHOW_FN(disabled_keys, EV_KEY, true);
271 ATTR_SHOW_FN(disabled_switches, EV_SW, true);
272
273 /*
274 * ATTRIBUTES:
275 *
276 * /sys/devices/platform/gpio-keys/keys [ro]
277 * /sys/devices/platform/gpio-keys/switches [ro]
278 */
279 static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL);
280 static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL);
281
282 #define ATTR_STORE_FN(name, type) \
283 static ssize_t gpio_keys_store_##name(struct device *dev, \
284 struct device_attribute *attr, \
285 const char *buf, \
286 size_t count) \
287 { \
288 struct platform_device *pdev = to_platform_device(dev); \
289 struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
290 ssize_t error; \
291 \
292 error = gpio_keys_attr_store_helper(ddata, buf, type); \
293 if (error) \
294 return error; \
295 \
296 return count; \
297 }
298
299 ATTR_STORE_FN(disabled_keys, EV_KEY);
300 ATTR_STORE_FN(disabled_switches, EV_SW);
301
302 /*
303 * ATTRIBUTES:
304 *
305 * /sys/devices/platform/gpio-keys/disabled_keys [rw]
306 * /sys/devices/platform/gpio-keys/disables_switches [rw]
307 */
308 static DEVICE_ATTR(disabled_keys, S_IWUSR | S_IRUGO,
309 gpio_keys_show_disabled_keys,
310 gpio_keys_store_disabled_keys);
311 static DEVICE_ATTR(disabled_switches, S_IWUSR | S_IRUGO,
312 gpio_keys_show_disabled_switches,
313 gpio_keys_store_disabled_switches);
314
315 static struct attribute *gpio_keys_attrs[] = {
316 &dev_attr_keys.attr,
317 &dev_attr_switches.attr,
318 &dev_attr_disabled_keys.attr,
319 &dev_attr_disabled_switches.attr,
320 NULL,
321 };
322
323 static struct attribute_group gpio_keys_attr_group = {
324 .attrs = gpio_keys_attrs,
325 };
326
gpio_keys_gpio_report_event(struct gpio_button_data * bdata)327 static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata)
328 {
329 const struct gpio_keys_button *button = bdata->button;
330 struct input_dev *input = bdata->input;
331 unsigned int type = button->type ?: EV_KEY;
332 int state = (gpio_get_value_cansleep(button->gpio) ? 1 : 0) ^ button->active_low;
333
334 if (type == EV_ABS) {
335 if (state)
336 input_event(input, type, button->code, button->value);
337 } else {
338 input_event(input, type, button->code, !!state);
339 }
340 input_sync(input);
341 }
342
gpio_keys_gpio_work_func(struct work_struct * work)343 static void gpio_keys_gpio_work_func(struct work_struct *work)
344 {
345 struct gpio_button_data *bdata =
346 container_of(work, struct gpio_button_data, work);
347
348 gpio_keys_gpio_report_event(bdata);
349 }
350
gpio_keys_gpio_timer(unsigned long _data)351 static void gpio_keys_gpio_timer(unsigned long _data)
352 {
353 struct gpio_button_data *bdata = (struct gpio_button_data *)_data;
354
355 schedule_work(&bdata->work);
356 }
357
gpio_keys_gpio_isr(int irq,void * dev_id)358 static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id)
359 {
360 struct gpio_button_data *bdata = dev_id;
361
362 BUG_ON(irq != bdata->irq);
363
364 if (bdata->timer_debounce)
365 mod_timer(&bdata->timer,
366 jiffies + msecs_to_jiffies(bdata->timer_debounce));
367 else
368 schedule_work(&bdata->work);
369
370 return IRQ_HANDLED;
371 }
372
gpio_keys_irq_timer(unsigned long _data)373 static void gpio_keys_irq_timer(unsigned long _data)
374 {
375 struct gpio_button_data *bdata = (struct gpio_button_data *)_data;
376 struct input_dev *input = bdata->input;
377 unsigned long flags;
378
379 spin_lock_irqsave(&bdata->lock, flags);
380 if (bdata->key_pressed) {
381 input_event(input, EV_KEY, bdata->button->code, 0);
382 input_sync(input);
383 bdata->key_pressed = false;
384 }
385 spin_unlock_irqrestore(&bdata->lock, flags);
386 }
387
gpio_keys_irq_isr(int irq,void * dev_id)388 static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id)
389 {
390 struct gpio_button_data *bdata = dev_id;
391 const struct gpio_keys_button *button = bdata->button;
392 struct input_dev *input = bdata->input;
393 unsigned long flags;
394
395 BUG_ON(irq != bdata->irq);
396
397 spin_lock_irqsave(&bdata->lock, flags);
398
399 if (!bdata->key_pressed) {
400 input_event(input, EV_KEY, button->code, 1);
401 input_sync(input);
402
403 if (!bdata->timer_debounce) {
404 input_event(input, EV_KEY, button->code, 0);
405 input_sync(input);
406 goto out;
407 }
408
409 bdata->key_pressed = true;
410 }
411
412 if (bdata->timer_debounce)
413 mod_timer(&bdata->timer,
414 jiffies + msecs_to_jiffies(bdata->timer_debounce));
415 out:
416 spin_unlock_irqrestore(&bdata->lock, flags);
417 return IRQ_HANDLED;
418 }
419
gpio_keys_setup_key(struct platform_device * pdev,struct input_dev * input,struct gpio_button_data * bdata,const struct gpio_keys_button * button)420 static int __devinit gpio_keys_setup_key(struct platform_device *pdev,
421 struct input_dev *input,
422 struct gpio_button_data *bdata,
423 const struct gpio_keys_button *button)
424 {
425 const char *desc = button->desc ? button->desc : "gpio_keys";
426 struct device *dev = &pdev->dev;
427 irq_handler_t isr;
428 unsigned long irqflags;
429 int irq, error;
430
431 bdata->input = input;
432 bdata->button = button;
433 spin_lock_init(&bdata->lock);
434
435 if (gpio_is_valid(button->gpio)) {
436
437 error = gpio_request(button->gpio, desc);
438 if (error < 0) {
439 dev_err(dev, "Failed to request GPIO %d, error %d\n",
440 button->gpio, error);
441 return error;
442 }
443
444 error = gpio_direction_input(button->gpio);
445 if (error < 0) {
446 dev_err(dev,
447 "Failed to configure direction for GPIO %d, error %d\n",
448 button->gpio, error);
449 goto fail;
450 }
451
452 if (button->debounce_interval) {
453 error = gpio_set_debounce(button->gpio,
454 button->debounce_interval * 1000);
455 /* use timer if gpiolib doesn't provide debounce */
456 if (error < 0)
457 bdata->timer_debounce =
458 button->debounce_interval;
459 }
460
461 irq = gpio_to_irq(button->gpio);
462 if (irq < 0) {
463 error = irq;
464 dev_err(dev,
465 "Unable to get irq number for GPIO %d, error %d\n",
466 button->gpio, error);
467 goto fail;
468 }
469 bdata->irq = irq;
470
471 INIT_WORK(&bdata->work, gpio_keys_gpio_work_func);
472 setup_timer(&bdata->timer,
473 gpio_keys_gpio_timer, (unsigned long)bdata);
474
475 isr = gpio_keys_gpio_isr;
476 irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
477
478 } else {
479 if (!button->irq) {
480 dev_err(dev, "No IRQ specified\n");
481 return -EINVAL;
482 }
483 bdata->irq = button->irq;
484
485 if (button->type && button->type != EV_KEY) {
486 dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n");
487 return -EINVAL;
488 }
489
490 bdata->timer_debounce = button->debounce_interval;
491 setup_timer(&bdata->timer,
492 gpio_keys_irq_timer, (unsigned long)bdata);
493
494 isr = gpio_keys_irq_isr;
495 irqflags = 0;
496 }
497
498 input_set_capability(input, button->type ?: EV_KEY, button->code);
499
500 /*
501 * If platform has specified that the button can be disabled,
502 * we don't want it to share the interrupt line.
503 */
504 if (!button->can_disable)
505 irqflags |= IRQF_SHARED;
506
507 error = request_any_context_irq(bdata->irq, isr, irqflags, desc, bdata);
508 if (error < 0) {
509 dev_err(dev, "Unable to claim irq %d; error %d\n",
510 bdata->irq, error);
511 goto fail;
512 }
513
514 return 0;
515
516 fail:
517 if (gpio_is_valid(button->gpio))
518 gpio_free(button->gpio);
519
520 return error;
521 }
522
gpio_keys_open(struct input_dev * input)523 static int gpio_keys_open(struct input_dev *input)
524 {
525 struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
526
527 return ddata->enable ? ddata->enable(input->dev.parent) : 0;
528 }
529
gpio_keys_close(struct input_dev * input)530 static void gpio_keys_close(struct input_dev *input)
531 {
532 struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
533
534 if (ddata->disable)
535 ddata->disable(input->dev.parent);
536 }
537
538 /*
539 * Handlers for alternative sources of platform_data
540 */
541 #ifdef CONFIG_OF
542 /*
543 * Translate OpenFirmware node properties into platform_data
544 */
gpio_keys_get_devtree_pdata(struct device * dev,struct gpio_keys_platform_data * pdata)545 static int gpio_keys_get_devtree_pdata(struct device *dev,
546 struct gpio_keys_platform_data *pdata)
547 {
548 struct device_node *node, *pp;
549 int i;
550 struct gpio_keys_button *buttons;
551 u32 reg;
552
553 node = dev->of_node;
554 if (node == NULL)
555 return -ENODEV;
556
557 memset(pdata, 0, sizeof *pdata);
558
559 pdata->rep = !!of_get_property(node, "autorepeat", NULL);
560
561 /* First count the subnodes */
562 pdata->nbuttons = 0;
563 pp = NULL;
564 while ((pp = of_get_next_child(node, pp)))
565 pdata->nbuttons++;
566
567 if (pdata->nbuttons == 0)
568 return -ENODEV;
569
570 buttons = kzalloc(pdata->nbuttons * (sizeof *buttons), GFP_KERNEL);
571 if (!buttons)
572 return -ENOMEM;
573
574 pp = NULL;
575 i = 0;
576 while ((pp = of_get_next_child(node, pp))) {
577 enum of_gpio_flags flags;
578
579 if (!of_find_property(pp, "gpios", NULL)) {
580 pdata->nbuttons--;
581 dev_warn(dev, "Found button without gpios\n");
582 continue;
583 }
584 buttons[i].gpio = of_get_gpio_flags(pp, 0, &flags);
585 buttons[i].active_low = flags & OF_GPIO_ACTIVE_LOW;
586
587 if (of_property_read_u32(pp, "linux,code", ®)) {
588 dev_err(dev, "Button without keycode: 0x%x\n", buttons[i].gpio);
589 goto out_fail;
590 }
591 buttons[i].code = reg;
592
593 buttons[i].desc = of_get_property(pp, "label", NULL);
594
595 if (of_property_read_u32(pp, "linux,input-type", ®) == 0)
596 buttons[i].type = reg;
597 else
598 buttons[i].type = EV_KEY;
599
600 buttons[i].wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL);
601
602 if (of_property_read_u32(pp, "debounce-interval", ®) == 0)
603 buttons[i].debounce_interval = reg;
604 else
605 buttons[i].debounce_interval = 5;
606
607 i++;
608 }
609
610 pdata->buttons = buttons;
611
612 return 0;
613
614 out_fail:
615 kfree(buttons);
616 return -ENODEV;
617 }
618
619 static struct of_device_id gpio_keys_of_match[] = {
620 { .compatible = "gpio-keys", },
621 { },
622 };
623 MODULE_DEVICE_TABLE(of, gpio_keys_of_match);
624
625 #else
626
gpio_keys_get_devtree_pdata(struct device * dev,struct gpio_keys_platform_data * altp)627 static int gpio_keys_get_devtree_pdata(struct device *dev,
628 struct gpio_keys_platform_data *altp)
629 {
630 return -ENODEV;
631 }
632
633 #define gpio_keys_of_match NULL
634
635 #endif
636
gpio_remove_key(struct gpio_button_data * bdata)637 static void gpio_remove_key(struct gpio_button_data *bdata)
638 {
639 free_irq(bdata->irq, bdata);
640 if (bdata->timer_debounce)
641 del_timer_sync(&bdata->timer);
642 cancel_work_sync(&bdata->work);
643 if (gpio_is_valid(bdata->button->gpio))
644 gpio_free(bdata->button->gpio);
645 }
646
gpio_keys_probe(struct platform_device * pdev)647 static int __devinit gpio_keys_probe(struct platform_device *pdev)
648 {
649 const struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
650 struct gpio_keys_drvdata *ddata;
651 struct device *dev = &pdev->dev;
652 struct gpio_keys_platform_data alt_pdata;
653 struct input_dev *input;
654 int i, error;
655 int wakeup = 0;
656
657 if (!pdata) {
658 error = gpio_keys_get_devtree_pdata(dev, &alt_pdata);
659 if (error)
660 return error;
661 pdata = &alt_pdata;
662 }
663
664 ddata = kzalloc(sizeof(struct gpio_keys_drvdata) +
665 pdata->nbuttons * sizeof(struct gpio_button_data),
666 GFP_KERNEL);
667 input = input_allocate_device();
668 if (!ddata || !input) {
669 dev_err(dev, "failed to allocate state\n");
670 error = -ENOMEM;
671 goto fail1;
672 }
673
674 ddata->input = input;
675 ddata->n_buttons = pdata->nbuttons;
676 ddata->enable = pdata->enable;
677 ddata->disable = pdata->disable;
678 mutex_init(&ddata->disable_lock);
679
680 platform_set_drvdata(pdev, ddata);
681 input_set_drvdata(input, ddata);
682
683 input->name = pdata->name ? : pdev->name;
684 input->phys = "gpio-keys/input0";
685 input->dev.parent = &pdev->dev;
686 input->open = gpio_keys_open;
687 input->close = gpio_keys_close;
688
689 input->id.bustype = BUS_HOST;
690 input->id.vendor = 0x0001;
691 input->id.product = 0x0001;
692 input->id.version = 0x0100;
693
694 /* Enable auto repeat feature of Linux input subsystem */
695 if (pdata->rep)
696 __set_bit(EV_REP, input->evbit);
697
698 for (i = 0; i < pdata->nbuttons; i++) {
699 const struct gpio_keys_button *button = &pdata->buttons[i];
700 struct gpio_button_data *bdata = &ddata->data[i];
701
702 error = gpio_keys_setup_key(pdev, input, bdata, button);
703 if (error)
704 goto fail2;
705
706 if (button->wakeup)
707 wakeup = 1;
708 }
709
710 error = sysfs_create_group(&pdev->dev.kobj, &gpio_keys_attr_group);
711 if (error) {
712 dev_err(dev, "Unable to export keys/switches, error: %d\n",
713 error);
714 goto fail2;
715 }
716
717 error = input_register_device(input);
718 if (error) {
719 dev_err(dev, "Unable to register input device, error: %d\n",
720 error);
721 goto fail3;
722 }
723
724 /* get current state of buttons that are connected to GPIOs */
725 for (i = 0; i < pdata->nbuttons; i++) {
726 struct gpio_button_data *bdata = &ddata->data[i];
727 if (gpio_is_valid(bdata->button->gpio))
728 gpio_keys_gpio_report_event(bdata);
729 }
730 input_sync(input);
731
732 device_init_wakeup(&pdev->dev, wakeup);
733
734 return 0;
735
736 fail3:
737 sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group);
738 fail2:
739 while (--i >= 0)
740 gpio_remove_key(&ddata->data[i]);
741
742 platform_set_drvdata(pdev, NULL);
743 fail1:
744 input_free_device(input);
745 kfree(ddata);
746 /* If we have no platform_data, we allocated buttons dynamically. */
747 if (!pdev->dev.platform_data)
748 kfree(pdata->buttons);
749
750 return error;
751 }
752
gpio_keys_remove(struct platform_device * pdev)753 static int __devexit gpio_keys_remove(struct platform_device *pdev)
754 {
755 struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev);
756 struct input_dev *input = ddata->input;
757 int i;
758
759 sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group);
760
761 device_init_wakeup(&pdev->dev, 0);
762
763 for (i = 0; i < ddata->n_buttons; i++)
764 gpio_remove_key(&ddata->data[i]);
765
766 input_unregister_device(input);
767
768 /*
769 * If we had no platform_data, we allocated buttons dynamically, and
770 * must free them here. ddata->data[0].button is the pointer to the
771 * beginning of the allocated array.
772 */
773 if (!pdev->dev.platform_data)
774 kfree(ddata->data[0].button);
775
776 kfree(ddata);
777
778 return 0;
779 }
780
781 #ifdef CONFIG_PM_SLEEP
gpio_keys_suspend(struct device * dev)782 static int gpio_keys_suspend(struct device *dev)
783 {
784 struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
785 int i;
786
787 if (device_may_wakeup(dev)) {
788 for (i = 0; i < ddata->n_buttons; i++) {
789 struct gpio_button_data *bdata = &ddata->data[i];
790 if (bdata->button->wakeup)
791 enable_irq_wake(bdata->irq);
792 }
793 }
794
795 return 0;
796 }
797
gpio_keys_resume(struct device * dev)798 static int gpio_keys_resume(struct device *dev)
799 {
800 struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
801 int i;
802
803 for (i = 0; i < ddata->n_buttons; i++) {
804 struct gpio_button_data *bdata = &ddata->data[i];
805 if (bdata->button->wakeup && device_may_wakeup(dev))
806 disable_irq_wake(bdata->irq);
807
808 if (gpio_is_valid(bdata->button->gpio))
809 gpio_keys_gpio_report_event(bdata);
810 }
811 input_sync(ddata->input);
812
813 return 0;
814 }
815 #endif
816
817 static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume);
818
819 static struct platform_driver gpio_keys_device_driver = {
820 .probe = gpio_keys_probe,
821 .remove = __devexit_p(gpio_keys_remove),
822 .driver = {
823 .name = "gpio-keys",
824 .owner = THIS_MODULE,
825 .pm = &gpio_keys_pm_ops,
826 .of_match_table = gpio_keys_of_match,
827 }
828 };
829
gpio_keys_init(void)830 static int __init gpio_keys_init(void)
831 {
832 return platform_driver_register(&gpio_keys_device_driver);
833 }
834
gpio_keys_exit(void)835 static void __exit gpio_keys_exit(void)
836 {
837 platform_driver_unregister(&gpio_keys_device_driver);
838 }
839
840 late_initcall(gpio_keys_init);
841 module_exit(gpio_keys_exit);
842
843 MODULE_LICENSE("GPL");
844 MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>");
845 MODULE_DESCRIPTION("Keyboard driver for GPIOs");
846 MODULE_ALIAS("platform:gpio-keys");
847