Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/input/keyboard/gpio_keys.c

  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.h>
 30 #include <linux/of_platform.h>
 31 #include <linux/of_gpio.h>
 32 #include <linux/spinlock.h>
 33 
 34 struct gpio_button_data {
 35         const struct gpio_keys_button *button;
 36         struct input_dev *input;
 37         struct timer_list timer;
 38         struct work_struct work;
 39         unsigned int timer_debounce;    /* in msecs */
 40         unsigned int irq;
 41         spinlock_t lock;
 42         bool disabled;
 43         bool key_pressed;
 44 };
 45 
 46 struct gpio_keys_drvdata {
 47         const struct gpio_keys_platform_data *pdata;
 48         struct input_dev *input;
 49         struct mutex disable_lock;
 50         struct gpio_button_data data[0];
 51 };
 52 
 53 /*
 54  * SYSFS interface for enabling/disabling keys and switches:
 55  *
 56  * There are 4 attributes under /sys/devices/platform/gpio-keys/
 57  *      keys [ro]              - bitmap of keys (EV_KEY) which can be
 58  *                               disabled
 59  *      switches [ro]          - bitmap of switches (EV_SW) which can be
 60  *                               disabled
 61  *      disabled_keys [rw]     - bitmap of keys currently disabled
 62  *      disabled_switches [rw] - bitmap of switches currently disabled
 63  *
 64  * Userland can change these values and hence disable event generation
 65  * for each key (or switch). Disabling a key means its interrupt line
 66  * is disabled.
 67  *
 68  * For example, if we have following switches set up as gpio-keys:
 69  *      SW_DOCK = 5
 70  *      SW_CAMERA_LENS_COVER = 9
 71  *      SW_KEYPAD_SLIDE = 10
 72  *      SW_FRONT_PROXIMITY = 11
 73  * This is read from switches:
 74  *      11-9,5
 75  * Next we want to disable proximity (11) and dock (5), we write:
 76  *      11,5
 77  * to file disabled_switches. Now proximity and dock IRQs are disabled.
 78  * This can be verified by reading the file disabled_switches:
 79  *      11,5
 80  * If we now want to enable proximity (11) switch we write:
 81  *      5
 82  * to disabled_switches.
 83  *
 84  * We can disable only those keys which don't allow sharing the irq.
 85  */
 86 
 87 /**
 88  * get_n_events_by_type() - returns maximum number of events per @type
 89  * @type: type of button (%EV_KEY, %EV_SW)
 90  *
 91  * Return value of this function can be used to allocate bitmap
 92  * large enough to hold all bits for given type.
 93  */
 94 static inline int get_n_events_by_type(int type)
 95 {
 96         BUG_ON(type != EV_SW && type != EV_KEY);
 97 
 98         return (type == EV_KEY) ? KEY_CNT : SW_CNT;
 99 }
100 
101 /**
102  * gpio_keys_disable_button() - disables given GPIO button
103  * @bdata: button data for button to be disabled
104  *
105  * Disables button pointed by @bdata. This is done by masking
106  * IRQ line. After this function is called, button won't generate
107  * input events anymore. Note that one can only disable buttons
108  * that don't share IRQs.
109  *
110  * Make sure that @bdata->disable_lock is locked when entering
111  * this function to avoid races when concurrent threads are
112  * disabling buttons at the same time.
113  */
114 static void gpio_keys_disable_button(struct gpio_button_data *bdata)
115 {
116         if (!bdata->disabled) {
117                 /*
118                  * Disable IRQ and possible debouncing timer.
119                  */
120                 disable_irq(bdata->irq);
121                 if (bdata->timer_debounce)
122                         del_timer_sync(&bdata->timer);
123 
124                 bdata->disabled = true;
125         }
126 }
127 
128 /**
129  * gpio_keys_enable_button() - enables given GPIO button
130  * @bdata: button data for button to be disabled
131  *
132  * Enables given button pointed by @bdata.
133  *
134  * Make sure that @bdata->disable_lock is locked when entering
135  * this function to avoid races with concurrent threads trying
136  * to enable the same button at the same time.
137  */
138 static void gpio_keys_enable_button(struct gpio_button_data *bdata)
139 {
140         if (bdata->disabled) {
141                 enable_irq(bdata->irq);
142                 bdata->disabled = false;
143         }
144 }
145 
146 /**
147  * gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons
148  * @ddata: pointer to drvdata
149  * @buf: buffer where stringified bitmap is written
150  * @type: button type (%EV_KEY, %EV_SW)
151  * @only_disabled: does caller want only those buttons that are
152  *                 currently disabled or all buttons that can be
153  *                 disabled
154  *
155  * This function writes buttons that can be disabled to @buf. If
156  * @only_disabled is true, then @buf contains only those buttons
157  * that are currently disabled. Returns 0 on success or negative
158  * errno on failure.
159  */
160 static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata,
161                                           char *buf, unsigned int type,
162                                           bool only_disabled)
163 {
164         int n_events = get_n_events_by_type(type);
165         unsigned long *bits;
166         ssize_t ret;
167         int i;
168 
169         bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL);
170         if (!bits)
171                 return -ENOMEM;
172 
173         for (i = 0; i < ddata->pdata->nbuttons; i++) {
174                 struct gpio_button_data *bdata = &ddata->data[i];
175 
176                 if (bdata->button->type != type)
177                         continue;
178 
179                 if (only_disabled && !bdata->disabled)
180                         continue;
181 
182                 __set_bit(bdata->button->code, bits);
183         }
184 
185         ret = bitmap_scnlistprintf(buf, PAGE_SIZE - 2, bits, n_events);
186         buf[ret++] = '\n';
187         buf[ret] = '\0';
188 
189         kfree(bits);
190 
191         return ret;
192 }
193 
194 /**
195  * gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap
196  * @ddata: pointer to drvdata
197  * @buf: buffer from userspace that contains stringified bitmap
198  * @type: button type (%EV_KEY, %EV_SW)
199  *
200  * This function parses stringified bitmap from @buf and disables/enables
201  * GPIO buttons accordingly. Returns 0 on success and negative error
202  * on failure.
203  */
204 static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata,
205                                            const char *buf, unsigned int type)
206 {
207         int n_events = get_n_events_by_type(type);
208         unsigned long *bits;
209         ssize_t error;
210         int i;
211 
212         bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL);
213         if (!bits)
214                 return -ENOMEM;
215 
216         error = bitmap_parselist(buf, bits, n_events);
217         if (error)
218                 goto out;
219 
220         /* First validate */
221         for (i = 0; i < ddata->pdata->nbuttons; i++) {
222                 struct gpio_button_data *bdata = &ddata->data[i];
223 
224                 if (bdata->button->type != type)
225                         continue;
226 
227                 if (test_bit(bdata->button->code, bits) &&
228                     !bdata->button->can_disable) {
229                         error = -EINVAL;
230                         goto out;
231                 }
232         }
233 
234         mutex_lock(&ddata->disable_lock);
235 
236         for (i = 0; i < ddata->pdata->nbuttons; i++) {
237                 struct gpio_button_data *bdata = &ddata->data[i];
238 
239                 if (bdata->button->type != type)
240                         continue;
241 
242                 if (test_bit(bdata->button->code, bits))
243                         gpio_keys_disable_button(bdata);
244                 else
245                         gpio_keys_enable_button(bdata);
246         }
247 
248         mutex_unlock(&ddata->disable_lock);
249 
250 out:
251         kfree(bits);
252         return error;
253 }
254 
255 #define ATTR_SHOW_FN(name, type, only_disabled)                         \
256 static ssize_t gpio_keys_show_##name(struct device *dev,                \
257                                      struct device_attribute *attr,     \
258                                      char *buf)                         \
259 {                                                                       \
260         struct platform_device *pdev = to_platform_device(dev);         \
261         struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev);   \
262                                                                         \
263         return gpio_keys_attr_show_helper(ddata, buf,                   \
264                                           type, only_disabled);         \
265 }
266 
267 ATTR_SHOW_FN(keys, EV_KEY, false);
268 ATTR_SHOW_FN(switches, EV_SW, false);
269 ATTR_SHOW_FN(disabled_keys, EV_KEY, true);
270 ATTR_SHOW_FN(disabled_switches, EV_SW, true);
271 
272 /*
273  * ATTRIBUTES:
274  *
275  * /sys/devices/platform/gpio-keys/keys [ro]
276  * /sys/devices/platform/gpio-keys/switches [ro]
277  */
278 static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL);
279 static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL);
280 
281 #define ATTR_STORE_FN(name, type)                                       \
282 static ssize_t gpio_keys_store_##name(struct device *dev,               \
283                                       struct device_attribute *attr,    \
284                                       const char *buf,                  \
285                                       size_t count)                     \
286 {                                                                       \
287         struct platform_device *pdev = to_platform_device(dev);         \
288         struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev);   \
289         ssize_t error;                                                  \
290                                                                         \
291         error = gpio_keys_attr_store_helper(ddata, buf, type);          \
292         if (error)                                                      \
293                 return error;                                           \
294                                                                         \
295         return count;                                                   \
296 }
297 
298 ATTR_STORE_FN(disabled_keys, EV_KEY);
299 ATTR_STORE_FN(disabled_switches, EV_SW);
300 
301 /*
302  * ATTRIBUTES:
303  *
304  * /sys/devices/platform/gpio-keys/disabled_keys [rw]
305  * /sys/devices/platform/gpio-keys/disables_switches [rw]
306  */
307 static DEVICE_ATTR(disabled_keys, S_IWUSR | S_IRUGO,
308                    gpio_keys_show_disabled_keys,
309                    gpio_keys_store_disabled_keys);
310 static DEVICE_ATTR(disabled_switches, S_IWUSR | S_IRUGO,
311                    gpio_keys_show_disabled_switches,
312                    gpio_keys_store_disabled_switches);
313 
314 static struct attribute *gpio_keys_attrs[] = {
315         &dev_attr_keys.attr,
316         &dev_attr_switches.attr,
317         &dev_attr_disabled_keys.attr,
318         &dev_attr_disabled_switches.attr,
319         NULL,
320 };
321 
322 static struct attribute_group gpio_keys_attr_group = {
323         .attrs = gpio_keys_attrs,
324 };
325 
326 static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata)
327 {
328         const struct gpio_keys_button *button = bdata->button;
329         struct input_dev *input = bdata->input;
330         unsigned int type = button->type ?: EV_KEY;
331         int state = (gpio_get_value_cansleep(button->gpio) ? 1 : 0) ^ button->active_low;
332 
333         if (type == EV_ABS) {
334                 if (state)
335                         input_event(input, type, button->code, button->value);
336         } else {
337                 input_event(input, type, button->code, !!state);
338         }
339         input_sync(input);
340 }
341 
342 static void gpio_keys_gpio_work_func(struct work_struct *work)
343 {
344         struct gpio_button_data *bdata =
345                 container_of(work, struct gpio_button_data, work);
346 
347         gpio_keys_gpio_report_event(bdata);
348 
349         if (bdata->button->wakeup)
350                 pm_relax(bdata->input->dev.parent);
351 }
352 
353 static void gpio_keys_gpio_timer(unsigned long _data)
354 {
355         struct gpio_button_data *bdata = (struct gpio_button_data *)_data;
356 
357         schedule_work(&bdata->work);
358 }
359 
360 static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id)
361 {
362         struct gpio_button_data *bdata = dev_id;
363 
364         BUG_ON(irq != bdata->irq);
365 
366         if (bdata->button->wakeup)
367                 pm_stay_awake(bdata->input->dev.parent);
368         if (bdata->timer_debounce)
369                 mod_timer(&bdata->timer,
370                         jiffies + msecs_to_jiffies(bdata->timer_debounce));
371         else
372                 schedule_work(&bdata->work);
373 
374         return IRQ_HANDLED;
375 }
376 
377 static void gpio_keys_irq_timer(unsigned long _data)
378 {
379         struct gpio_button_data *bdata = (struct gpio_button_data *)_data;
380         struct input_dev *input = bdata->input;
381         unsigned long flags;
382 
383         spin_lock_irqsave(&bdata->lock, flags);
384         if (bdata->key_pressed) {
385                 input_event(input, EV_KEY, bdata->button->code, 0);
386                 input_sync(input);
387                 bdata->key_pressed = false;
388         }
389         spin_unlock_irqrestore(&bdata->lock, flags);
390 }
391 
392 static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id)
393 {
394         struct gpio_button_data *bdata = dev_id;
395         const struct gpio_keys_button *button = bdata->button;
396         struct input_dev *input = bdata->input;
397         unsigned long flags;
398 
399         BUG_ON(irq != bdata->irq);
400 
401         spin_lock_irqsave(&bdata->lock, flags);
402 
403         if (!bdata->key_pressed) {
404                 if (bdata->button->wakeup)
405                         pm_wakeup_event(bdata->input->dev.parent, 0);
406 
407                 input_event(input, EV_KEY, button->code, 1);
408                 input_sync(input);
409 
410                 if (!bdata->timer_debounce) {
411                         input_event(input, EV_KEY, button->code, 0);
412                         input_sync(input);
413                         goto out;
414                 }
415 
416                 bdata->key_pressed = true;
417         }
418 
419         if (bdata->timer_debounce)
420                 mod_timer(&bdata->timer,
421                         jiffies + msecs_to_jiffies(bdata->timer_debounce));
422 out:
423         spin_unlock_irqrestore(&bdata->lock, flags);
424         return IRQ_HANDLED;
425 }
426 
427 static int gpio_keys_setup_key(struct platform_device *pdev,
428                                 struct input_dev *input,
429                                 struct gpio_button_data *bdata,
430                                 const struct gpio_keys_button *button)
431 {
432         const char *desc = button->desc ? button->desc : "gpio_keys";
433         struct device *dev = &pdev->dev;
434         irq_handler_t isr;
435         unsigned long irqflags;
436         int irq, error;
437 
438         bdata->input = input;
439         bdata->button = button;
440         spin_lock_init(&bdata->lock);
441 
442         if (gpio_is_valid(button->gpio)) {
443 
444                 error = gpio_request_one(button->gpio, GPIOF_IN, desc);
445                 if (error < 0) {
446                         dev_err(dev, "Failed to request GPIO %d, error %d\n",
447                                 button->gpio, error);
448                         return error;
449                 }
450 
451                 if (button->debounce_interval) {
452                         error = gpio_set_debounce(button->gpio,
453                                         button->debounce_interval * 1000);
454                         /* use timer if gpiolib doesn't provide debounce */
455                         if (error < 0)
456                                 bdata->timer_debounce =
457                                                 button->debounce_interval;
458                 }
459 
460                 irq = gpio_to_irq(button->gpio);
461                 if (irq < 0) {
462                         error = irq;
463                         dev_err(dev,
464                                 "Unable to get irq number for GPIO %d, error %d\n",
465                                 button->gpio, error);
466                         goto fail;
467                 }
468                 bdata->irq = irq;
469 
470                 INIT_WORK(&bdata->work, gpio_keys_gpio_work_func);
471                 setup_timer(&bdata->timer,
472                             gpio_keys_gpio_timer, (unsigned long)bdata);
473 
474                 isr = gpio_keys_gpio_isr;
475                 irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
476 
477         } else {
478                 if (!button->irq) {
479                         dev_err(dev, "No IRQ specified\n");
480                         return -EINVAL;
481                 }
482                 bdata->irq = button->irq;
483 
484                 if (button->type && button->type != EV_KEY) {
485                         dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n");
486                         return -EINVAL;
487                 }
488 
489                 bdata->timer_debounce = button->debounce_interval;
490                 setup_timer(&bdata->timer,
491                             gpio_keys_irq_timer, (unsigned long)bdata);
492 
493                 isr = gpio_keys_irq_isr;
494                 irqflags = 0;
495         }
496 
497         input_set_capability(input, button->type ?: EV_KEY, button->code);
498 
499         /*
500          * If platform has specified that the button can be disabled,
501          * we don't want it to share the interrupt line.
502          */
503         if (!button->can_disable)
504                 irqflags |= IRQF_SHARED;
505 
506         error = request_any_context_irq(bdata->irq, isr, irqflags, desc, bdata);
507         if (error < 0) {
508                 dev_err(dev, "Unable to claim irq %d; error %d\n",
509                         bdata->irq, error);
510                 goto fail;
511         }
512 
513         return 0;
514 
515 fail:
516         if (gpio_is_valid(button->gpio))
517                 gpio_free(button->gpio);
518 
519         return error;
520 }
521 
522 static void gpio_keys_report_state(struct gpio_keys_drvdata *ddata)
523 {
524         struct input_dev *input = ddata->input;
525         int i;
526 
527         for (i = 0; i < ddata->pdata->nbuttons; i++) {
528                 struct gpio_button_data *bdata = &ddata->data[i];
529                 if (gpio_is_valid(bdata->button->gpio))
530                         gpio_keys_gpio_report_event(bdata);
531         }
532         input_sync(input);
533 }
534 
535 static int gpio_keys_open(struct input_dev *input)
536 {
537         struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
538         const struct gpio_keys_platform_data *pdata = ddata->pdata;
539         int error;
540 
541         if (pdata->enable) {
542                 error = pdata->enable(input->dev.parent);
543                 if (error)
544                         return error;
545         }
546 
547         /* Report current state of buttons that are connected to GPIOs */
548         gpio_keys_report_state(ddata);
549 
550         return 0;
551 }
552 
553 static void gpio_keys_close(struct input_dev *input)
554 {
555         struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
556         const struct gpio_keys_platform_data *pdata = ddata->pdata;
557 
558         if (pdata->disable)
559                 pdata->disable(input->dev.parent);
560 }
561 
562 /*
563  * Handlers for alternative sources of platform_data
564  */
565 
566 #ifdef CONFIG_OF
567 /*
568  * Translate OpenFirmware node properties into platform_data
569  */
570 static struct gpio_keys_platform_data *
571 gpio_keys_get_devtree_pdata(struct device *dev)
572 {
573         struct device_node *node, *pp;
574         struct gpio_keys_platform_data *pdata;
575         struct gpio_keys_button *button;
576         int error;
577         int nbuttons;
578         int i;
579 
580         node = dev->of_node;
581         if (!node) {
582                 error = -ENODEV;
583                 goto err_out;
584         }
585 
586         nbuttons = of_get_child_count(node);
587         if (nbuttons == 0) {
588                 error = -ENODEV;
589                 goto err_out;
590         }
591 
592         pdata = kzalloc(sizeof(*pdata) + nbuttons * (sizeof *button),
593                         GFP_KERNEL);
594         if (!pdata) {
595                 error = -ENOMEM;
596                 goto err_out;
597         }
598 
599         pdata->buttons = (struct gpio_keys_button *)(pdata + 1);
600         pdata->nbuttons = nbuttons;
601 
602         pdata->rep = !!of_get_property(node, "autorepeat", NULL);
603 
604         i = 0;
605         for_each_child_of_node(node, pp) {
606                 int gpio;
607                 enum of_gpio_flags flags;
608 
609                 if (!of_find_property(pp, "gpios", NULL)) {
610                         pdata->nbuttons--;
611                         dev_warn(dev, "Found button without gpios\n");
612                         continue;
613                 }
614 
615                 gpio = of_get_gpio_flags(pp, 0, &flags);
616                 if (gpio < 0) {
617                         error = gpio;
618                         if (error != -EPROBE_DEFER)
619                                 dev_err(dev,
620                                         "Failed to get gpio flags, error: %d\n",
621                                         error);
622                         goto err_free_pdata;
623                 }
624 
625                 button = &pdata->buttons[i++];
626 
627                 button->gpio = gpio;
628                 button->active_low = flags & OF_GPIO_ACTIVE_LOW;
629 
630                 if (of_property_read_u32(pp, "linux,code", &button->code)) {
631                         dev_err(dev, "Button without keycode: 0x%x\n",
632                                 button->gpio);
633                         error = -EINVAL;
634                         goto err_free_pdata;
635                 }
636 
637                 button->desc = of_get_property(pp, "label", NULL);
638 
639                 if (of_property_read_u32(pp, "linux,input-type", &button->type))
640                         button->type = EV_KEY;
641 
642                 button->wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL);
643 
644                 if (of_property_read_u32(pp, "debounce-interval",
645                                          &button->debounce_interval))
646                         button->debounce_interval = 5;
647         }
648 
649         if (pdata->nbuttons == 0) {
650                 error = -EINVAL;
651                 goto err_free_pdata;
652         }
653 
654         return pdata;
655 
656 err_free_pdata:
657         kfree(pdata);
658 err_out:
659         return ERR_PTR(error);
660 }
661 
662 static struct of_device_id gpio_keys_of_match[] = {
663         { .compatible = "gpio-keys", },
664         { },
665 };
666 MODULE_DEVICE_TABLE(of, gpio_keys_of_match);
667 
668 #else
669 
670 static inline struct gpio_keys_platform_data *
671 gpio_keys_get_devtree_pdata(struct device *dev)
672 {
673         return ERR_PTR(-ENODEV);
674 }
675 
676 #endif
677 
678 static void gpio_remove_key(struct gpio_button_data *bdata)
679 {
680         free_irq(bdata->irq, bdata);
681         if (bdata->timer_debounce)
682                 del_timer_sync(&bdata->timer);
683         cancel_work_sync(&bdata->work);
684         if (gpio_is_valid(bdata->button->gpio))
685                 gpio_free(bdata->button->gpio);
686 }
687 
688 static int gpio_keys_probe(struct platform_device *pdev)
689 {
690         struct device *dev = &pdev->dev;
691         const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
692         struct gpio_keys_drvdata *ddata;
693         struct input_dev *input;
694         int i, error;
695         int wakeup = 0;
696 
697         if (!pdata) {
698                 pdata = gpio_keys_get_devtree_pdata(dev);
699                 if (IS_ERR(pdata))
700                         return PTR_ERR(pdata);
701         }
702 
703         ddata = kzalloc(sizeof(struct gpio_keys_drvdata) +
704                         pdata->nbuttons * sizeof(struct gpio_button_data),
705                         GFP_KERNEL);
706         input = input_allocate_device();
707         if (!ddata || !input) {
708                 dev_err(dev, "failed to allocate state\n");
709                 error = -ENOMEM;
710                 goto fail1;
711         }
712 
713         ddata->pdata = pdata;
714         ddata->input = input;
715         mutex_init(&ddata->disable_lock);
716 
717         platform_set_drvdata(pdev, ddata);
718         input_set_drvdata(input, ddata);
719 
720         input->name = pdata->name ? : pdev->name;
721         input->phys = "gpio-keys/input0";
722         input->dev.parent = &pdev->dev;
723         input->open = gpio_keys_open;
724         input->close = gpio_keys_close;
725 
726         input->id.bustype = BUS_HOST;
727         input->id.vendor = 0x0001;
728         input->id.product = 0x0001;
729         input->id.version = 0x0100;
730 
731         /* Enable auto repeat feature of Linux input subsystem */
732         if (pdata->rep)
733                 __set_bit(EV_REP, input->evbit);
734 
735         for (i = 0; i < pdata->nbuttons; i++) {
736                 const struct gpio_keys_button *button = &pdata->buttons[i];
737                 struct gpio_button_data *bdata = &ddata->data[i];
738 
739                 error = gpio_keys_setup_key(pdev, input, bdata, button);
740                 if (error)
741                         goto fail2;
742 
743                 if (button->wakeup)
744                         wakeup = 1;
745         }
746 
747         error = sysfs_create_group(&pdev->dev.kobj, &gpio_keys_attr_group);
748         if (error) {
749                 dev_err(dev, "Unable to export keys/switches, error: %d\n",
750                         error);
751                 goto fail2;
752         }
753 
754         error = input_register_device(input);
755         if (error) {
756                 dev_err(dev, "Unable to register input device, error: %d\n",
757                         error);
758                 goto fail3;
759         }
760 
761         device_init_wakeup(&pdev->dev, wakeup);
762 
763         return 0;
764 
765  fail3:
766         sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group);
767  fail2:
768         while (--i >= 0)
769                 gpio_remove_key(&ddata->data[i]);
770 
771  fail1:
772         input_free_device(input);
773         kfree(ddata);
774         /* If we have no platform data, we allocated pdata dynamically. */
775         if (!dev_get_platdata(&pdev->dev))
776                 kfree(pdata);
777 
778         return error;
779 }
780 
781 static int gpio_keys_remove(struct platform_device *pdev)
782 {
783         struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev);
784         struct input_dev *input = ddata->input;
785         int i;
786 
787         sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group);
788 
789         device_init_wakeup(&pdev->dev, 0);
790 
791         for (i = 0; i < ddata->pdata->nbuttons; i++)
792                 gpio_remove_key(&ddata->data[i]);
793 
794         input_unregister_device(input);
795 
796         /* If we have no platform data, we allocated pdata dynamically. */
797         if (!dev_get_platdata(&pdev->dev))
798                 kfree(ddata->pdata);
799 
800         kfree(ddata);
801 
802         return 0;
803 }
804 
805 #ifdef CONFIG_PM_SLEEP
806 static int gpio_keys_suspend(struct device *dev)
807 {
808         struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
809         struct input_dev *input = ddata->input;
810         int i;
811 
812         if (device_may_wakeup(dev)) {
813                 for (i = 0; i < ddata->pdata->nbuttons; i++) {
814                         struct gpio_button_data *bdata = &ddata->data[i];
815                         if (bdata->button->wakeup)
816                                 enable_irq_wake(bdata->irq);
817                 }
818         } else {
819                 mutex_lock(&input->mutex);
820                 if (input->users)
821                         gpio_keys_close(input);
822                 mutex_unlock(&input->mutex);
823         }
824 
825         return 0;
826 }
827 
828 static int gpio_keys_resume(struct device *dev)
829 {
830         struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
831         struct input_dev *input = ddata->input;
832         int error = 0;
833         int i;
834 
835         if (device_may_wakeup(dev)) {
836                 for (i = 0; i < ddata->pdata->nbuttons; i++) {
837                         struct gpio_button_data *bdata = &ddata->data[i];
838                         if (bdata->button->wakeup)
839                                 disable_irq_wake(bdata->irq);
840                 }
841         } else {
842                 mutex_lock(&input->mutex);
843                 if (input->users)
844                         error = gpio_keys_open(input);
845                 mutex_unlock(&input->mutex);
846         }
847 
848         if (error)
849                 return error;
850 
851         gpio_keys_report_state(ddata);
852         return 0;
853 }
854 #endif
855 
856 static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume);
857 
858 static struct platform_driver gpio_keys_device_driver = {
859         .probe          = gpio_keys_probe,
860         .remove         = gpio_keys_remove,
861         .driver         = {
862                 .name   = "gpio-keys",
863                 .owner  = THIS_MODULE,
864                 .pm     = &gpio_keys_pm_ops,
865                 .of_match_table = of_match_ptr(gpio_keys_of_match),
866         }
867 };
868 
869 static int __init gpio_keys_init(void)
870 {
871         return platform_driver_register(&gpio_keys_device_driver);
872 }
873 
874 static void __exit gpio_keys_exit(void)
875 {
876         platform_driver_unregister(&gpio_keys_device_driver);
877 }
878 
879 late_initcall(gpio_keys_init);
880 module_exit(gpio_keys_exit);
881 
882 MODULE_LICENSE("GPL");
883 MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>");
884 MODULE_DESCRIPTION("Keyboard driver for GPIOs");
885 MODULE_ALIAS("platform:gpio-keys");
886 

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