2 * Driver for keys on GPIO lines capable of generating interrupts.
4 * Copyright 2005 Phil Blundell
5 * Copyright 2010, 2011 David Jander <david@protonic.nl>
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.
12 #include <linux/module.h>
14 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/irq.h>
18 #include <linux/sched.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/gpio/consumer.h>
31 #include <linux/of_irq.h>
32 #include <linux/spinlock.h>
33 #include <dt-bindings/input/gpio-keys.h>
35 struct gpio_button_data {
36 const struct gpio_keys_button *button;
37 struct input_dev *input;
38 struct gpio_desc *gpiod;
42 struct timer_list release_timer;
43 unsigned int release_delay; /* in msecs, for IRQ-only buttons */
45 struct delayed_work work;
46 unsigned int software_debounce; /* in msecs, for GPIO-driven buttons */
49 unsigned int wakeup_trigger_type;
56 struct gpio_keys_drvdata {
57 const struct gpio_keys_platform_data *pdata;
58 struct input_dev *input;
59 struct mutex disable_lock;
60 unsigned short *keymap;
61 struct gpio_button_data data[0];
65 * SYSFS interface for enabling/disabling keys and switches:
67 * There are 4 attributes under /sys/devices/platform/gpio-keys/
68 * keys [ro] - bitmap of keys (EV_KEY) which can be
70 * switches [ro] - bitmap of switches (EV_SW) which can be
72 * disabled_keys [rw] - bitmap of keys currently disabled
73 * disabled_switches [rw] - bitmap of switches currently disabled
75 * Userland can change these values and hence disable event generation
76 * for each key (or switch). Disabling a key means its interrupt line
79 * For example, if we have following switches set up as gpio-keys:
81 * SW_CAMERA_LENS_COVER = 9
82 * SW_KEYPAD_SLIDE = 10
83 * SW_FRONT_PROXIMITY = 11
84 * This is read from switches:
86 * Next we want to disable proximity (11) and dock (5), we write:
88 * to file disabled_switches. Now proximity and dock IRQs are disabled.
89 * This can be verified by reading the file disabled_switches:
91 * If we now want to enable proximity (11) switch we write:
93 * to disabled_switches.
95 * We can disable only those keys which don't allow sharing the irq.
99 * get_n_events_by_type() - returns maximum number of events per @type
100 * @type: type of button (%EV_KEY, %EV_SW)
102 * Return value of this function can be used to allocate bitmap
103 * large enough to hold all bits for given type.
105 static int get_n_events_by_type(int type)
107 BUG_ON(type != EV_SW && type != EV_KEY);
109 return (type == EV_KEY) ? KEY_CNT : SW_CNT;
113 * get_bm_events_by_type() - returns bitmap of supported events per @type
114 * @input: input device from which bitmap is retrieved
115 * @type: type of button (%EV_KEY, %EV_SW)
117 * Return value of this function can be used to allocate bitmap
118 * large enough to hold all bits for given type.
120 static const unsigned long *get_bm_events_by_type(struct input_dev *dev,
123 BUG_ON(type != EV_SW && type != EV_KEY);
125 return (type == EV_KEY) ? dev->keybit : dev->swbit;
129 * gpio_keys_disable_button() - disables given GPIO button
130 * @bdata: button data for button to be disabled
132 * Disables button pointed by @bdata. This is done by masking
133 * IRQ line. After this function is called, button won't generate
134 * input events anymore. Note that one can only disable buttons
135 * that don't share IRQs.
137 * Make sure that @bdata->disable_lock is locked when entering
138 * this function to avoid races when concurrent threads are
139 * disabling buttons at the same time.
141 static void gpio_keys_disable_button(struct gpio_button_data *bdata)
143 if (!bdata->disabled) {
145 * Disable IRQ and associated timer/work structure.
147 disable_irq(bdata->irq);
150 cancel_delayed_work_sync(&bdata->work);
152 del_timer_sync(&bdata->release_timer);
154 bdata->disabled = true;
159 * gpio_keys_enable_button() - enables given GPIO button
160 * @bdata: button data for button to be disabled
162 * Enables given button pointed by @bdata.
164 * Make sure that @bdata->disable_lock is locked when entering
165 * this function to avoid races with concurrent threads trying
166 * to enable the same button at the same time.
168 static void gpio_keys_enable_button(struct gpio_button_data *bdata)
170 if (bdata->disabled) {
171 enable_irq(bdata->irq);
172 bdata->disabled = false;
177 * gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons
178 * @ddata: pointer to drvdata
179 * @buf: buffer where stringified bitmap is written
180 * @type: button type (%EV_KEY, %EV_SW)
181 * @only_disabled: does caller want only those buttons that are
182 * currently disabled or all buttons that can be
185 * This function writes buttons that can be disabled to @buf. If
186 * @only_disabled is true, then @buf contains only those buttons
187 * that are currently disabled. Returns 0 on success or negative
190 static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata,
191 char *buf, unsigned int type,
194 int n_events = get_n_events_by_type(type);
199 bits = bitmap_zalloc(n_events, GFP_KERNEL);
203 for (i = 0; i < ddata->pdata->nbuttons; i++) {
204 struct gpio_button_data *bdata = &ddata->data[i];
206 if (bdata->button->type != type)
209 if (only_disabled && !bdata->disabled)
212 __set_bit(*bdata->code, bits);
215 ret = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", n_events, bits);
225 * gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap
226 * @ddata: pointer to drvdata
227 * @buf: buffer from userspace that contains stringified bitmap
228 * @type: button type (%EV_KEY, %EV_SW)
230 * This function parses stringified bitmap from @buf and disables/enables
231 * GPIO buttons accordingly. Returns 0 on success and negative error
234 static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata,
235 const char *buf, unsigned int type)
237 int n_events = get_n_events_by_type(type);
238 const unsigned long *bitmap = get_bm_events_by_type(ddata->input, type);
243 bits = bitmap_zalloc(n_events, GFP_KERNEL);
247 error = bitmap_parselist(buf, bits, n_events);
252 if (!bitmap_subset(bits, bitmap, n_events)) {
257 for (i = 0; i < ddata->pdata->nbuttons; i++) {
258 struct gpio_button_data *bdata = &ddata->data[i];
260 if (bdata->button->type != type)
263 if (test_bit(*bdata->code, bits) &&
264 !bdata->button->can_disable) {
270 mutex_lock(&ddata->disable_lock);
272 for (i = 0; i < ddata->pdata->nbuttons; i++) {
273 struct gpio_button_data *bdata = &ddata->data[i];
275 if (bdata->button->type != type)
278 if (test_bit(*bdata->code, bits))
279 gpio_keys_disable_button(bdata);
281 gpio_keys_enable_button(bdata);
284 mutex_unlock(&ddata->disable_lock);
291 #define ATTR_SHOW_FN(name, type, only_disabled) \
292 static ssize_t gpio_keys_show_##name(struct device *dev, \
293 struct device_attribute *attr, \
296 struct platform_device *pdev = to_platform_device(dev); \
297 struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
299 return gpio_keys_attr_show_helper(ddata, buf, \
300 type, only_disabled); \
303 ATTR_SHOW_FN(keys, EV_KEY, false);
304 ATTR_SHOW_FN(switches, EV_SW, false);
305 ATTR_SHOW_FN(disabled_keys, EV_KEY, true);
306 ATTR_SHOW_FN(disabled_switches, EV_SW, true);
311 * /sys/devices/platform/gpio-keys/keys [ro]
312 * /sys/devices/platform/gpio-keys/switches [ro]
314 static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL);
315 static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL);
317 #define ATTR_STORE_FN(name, type) \
318 static ssize_t gpio_keys_store_##name(struct device *dev, \
319 struct device_attribute *attr, \
323 struct platform_device *pdev = to_platform_device(dev); \
324 struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
327 error = gpio_keys_attr_store_helper(ddata, buf, type); \
334 ATTR_STORE_FN(disabled_keys, EV_KEY);
335 ATTR_STORE_FN(disabled_switches, EV_SW);
340 * /sys/devices/platform/gpio-keys/disabled_keys [rw]
341 * /sys/devices/platform/gpio-keys/disables_switches [rw]
343 static DEVICE_ATTR(disabled_keys, S_IWUSR | S_IRUGO,
344 gpio_keys_show_disabled_keys,
345 gpio_keys_store_disabled_keys);
346 static DEVICE_ATTR(disabled_switches, S_IWUSR | S_IRUGO,
347 gpio_keys_show_disabled_switches,
348 gpio_keys_store_disabled_switches);
350 static struct attribute *gpio_keys_attrs[] = {
352 &dev_attr_switches.attr,
353 &dev_attr_disabled_keys.attr,
354 &dev_attr_disabled_switches.attr,
358 static const struct attribute_group gpio_keys_attr_group = {
359 .attrs = gpio_keys_attrs,
362 static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata)
364 const struct gpio_keys_button *button = bdata->button;
365 struct input_dev *input = bdata->input;
366 unsigned int type = button->type ?: EV_KEY;
369 state = gpiod_get_value_cansleep(bdata->gpiod);
371 dev_err(input->dev.parent,
372 "failed to get gpio state: %d\n", state);
376 if (type == EV_ABS) {
378 input_event(input, type, button->code, button->value);
380 input_event(input, type, *bdata->code, state);
385 static void gpio_keys_gpio_work_func(struct work_struct *work)
387 struct gpio_button_data *bdata =
388 container_of(work, struct gpio_button_data, work.work);
390 gpio_keys_gpio_report_event(bdata);
392 if (bdata->button->wakeup)
393 pm_relax(bdata->input->dev.parent);
396 static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id)
398 struct gpio_button_data *bdata = dev_id;
400 BUG_ON(irq != bdata->irq);
402 if (bdata->button->wakeup) {
403 const struct gpio_keys_button *button = bdata->button;
405 pm_stay_awake(bdata->input->dev.parent);
406 if (bdata->suspended &&
407 (button->type == 0 || button->type == EV_KEY)) {
409 * Simulate wakeup key press in case the key has
410 * already released by the time we got interrupt
413 input_report_key(bdata->input, button->code, 1);
417 mod_delayed_work(system_wq,
419 msecs_to_jiffies(bdata->software_debounce));
424 static void gpio_keys_irq_timer(struct timer_list *t)
426 struct gpio_button_data *bdata = from_timer(bdata, t, release_timer);
427 struct input_dev *input = bdata->input;
430 spin_lock_irqsave(&bdata->lock, flags);
431 if (bdata->key_pressed) {
432 input_event(input, EV_KEY, *bdata->code, 0);
434 bdata->key_pressed = false;
436 spin_unlock_irqrestore(&bdata->lock, flags);
439 static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id)
441 struct gpio_button_data *bdata = dev_id;
442 struct input_dev *input = bdata->input;
445 BUG_ON(irq != bdata->irq);
447 spin_lock_irqsave(&bdata->lock, flags);
449 if (!bdata->key_pressed) {
450 if (bdata->button->wakeup)
451 pm_wakeup_event(bdata->input->dev.parent, 0);
453 input_event(input, EV_KEY, *bdata->code, 1);
456 if (!bdata->release_delay) {
457 input_event(input, EV_KEY, *bdata->code, 0);
462 bdata->key_pressed = true;
465 if (bdata->release_delay)
466 mod_timer(&bdata->release_timer,
467 jiffies + msecs_to_jiffies(bdata->release_delay));
469 spin_unlock_irqrestore(&bdata->lock, flags);
473 static void gpio_keys_quiesce_key(void *data)
475 struct gpio_button_data *bdata = data;
478 cancel_delayed_work_sync(&bdata->work);
480 del_timer_sync(&bdata->release_timer);
483 static int gpio_keys_setup_key(struct platform_device *pdev,
484 struct input_dev *input,
485 struct gpio_keys_drvdata *ddata,
486 const struct gpio_keys_button *button,
488 struct fwnode_handle *child)
490 const char *desc = button->desc ? button->desc : "gpio_keys";
491 struct device *dev = &pdev->dev;
492 struct gpio_button_data *bdata = &ddata->data[idx];
494 unsigned long irqflags;
498 bdata->input = input;
499 bdata->button = button;
500 spin_lock_init(&bdata->lock);
503 bdata->gpiod = devm_fwnode_get_gpiod_from_child(dev, NULL,
507 if (IS_ERR(bdata->gpiod)) {
508 error = PTR_ERR(bdata->gpiod);
509 if (error == -ENOENT) {
511 * GPIO is optional, we may be dealing with
512 * purely interrupt-driven setup.
516 if (error != -EPROBE_DEFER)
517 dev_err(dev, "failed to get gpio: %d\n",
522 } else if (gpio_is_valid(button->gpio)) {
524 * Legacy GPIO number, so request the GPIO here and
525 * convert it to descriptor.
527 unsigned flags = GPIOF_IN;
529 if (button->active_low)
530 flags |= GPIOF_ACTIVE_LOW;
532 error = devm_gpio_request_one(dev, button->gpio, flags, desc);
534 dev_err(dev, "Failed to request GPIO %d, error %d\n",
535 button->gpio, error);
539 bdata->gpiod = gpio_to_desc(button->gpio);
545 bool active_low = gpiod_is_active_low(bdata->gpiod);
547 if (button->debounce_interval) {
548 error = gpiod_set_debounce(bdata->gpiod,
549 button->debounce_interval * 1000);
550 /* use timer if gpiolib doesn't provide debounce */
552 bdata->software_debounce =
553 button->debounce_interval;
557 bdata->irq = button->irq;
559 irq = gpiod_to_irq(bdata->gpiod);
563 "Unable to get irq number for GPIO %d, error %d\n",
564 button->gpio, error);
570 INIT_DELAYED_WORK(&bdata->work, gpio_keys_gpio_work_func);
572 isr = gpio_keys_gpio_isr;
573 irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
575 switch (button->wakeup_event_action) {
576 case EV_ACT_ASSERTED:
577 bdata->wakeup_trigger_type = active_low ?
578 IRQ_TYPE_EDGE_FALLING : IRQ_TYPE_EDGE_RISING;
580 case EV_ACT_DEASSERTED:
581 bdata->wakeup_trigger_type = active_low ?
582 IRQ_TYPE_EDGE_RISING : IRQ_TYPE_EDGE_FALLING;
588 * For other cases, we are OK letting suspend/resume
589 * not reconfigure the trigger type.
595 dev_err(dev, "Found button without gpio or irq\n");
599 bdata->irq = button->irq;
601 if (button->type && button->type != EV_KEY) {
602 dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n");
606 bdata->release_delay = button->debounce_interval;
607 timer_setup(&bdata->release_timer, gpio_keys_irq_timer, 0);
609 isr = gpio_keys_irq_isr;
613 * For IRQ buttons, there is no interrupt for release.
614 * So we don't need to reconfigure the trigger type for wakeup.
618 bdata->code = &ddata->keymap[idx];
619 *bdata->code = button->code;
620 input_set_capability(input, button->type ?: EV_KEY, *bdata->code);
623 * Install custom action to cancel release timer and
626 error = devm_add_action(dev, gpio_keys_quiesce_key, bdata);
628 dev_err(dev, "failed to register quiesce action, error: %d\n",
634 * If platform has specified that the button can be disabled,
635 * we don't want it to share the interrupt line.
637 if (!button->can_disable)
638 irqflags |= IRQF_SHARED;
640 error = devm_request_any_context_irq(dev, bdata->irq, isr, irqflags,
643 dev_err(dev, "Unable to claim irq %d; error %d\n",
651 static void gpio_keys_report_state(struct gpio_keys_drvdata *ddata)
653 struct input_dev *input = ddata->input;
656 for (i = 0; i < ddata->pdata->nbuttons; i++) {
657 struct gpio_button_data *bdata = &ddata->data[i];
659 gpio_keys_gpio_report_event(bdata);
664 static int gpio_keys_open(struct input_dev *input)
666 struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
667 const struct gpio_keys_platform_data *pdata = ddata->pdata;
671 error = pdata->enable(input->dev.parent);
676 /* Report current state of buttons that are connected to GPIOs */
677 gpio_keys_report_state(ddata);
682 static void gpio_keys_close(struct input_dev *input)
684 struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
685 const struct gpio_keys_platform_data *pdata = ddata->pdata;
688 pdata->disable(input->dev.parent);
692 * Handlers for alternative sources of platform_data
696 * Translate properties into platform_data
698 static struct gpio_keys_platform_data *
699 gpio_keys_get_devtree_pdata(struct device *dev)
701 struct gpio_keys_platform_data *pdata;
702 struct gpio_keys_button *button;
703 struct fwnode_handle *child;
706 nbuttons = device_get_child_node_count(dev);
708 return ERR_PTR(-ENODEV);
710 pdata = devm_kzalloc(dev,
711 sizeof(*pdata) + nbuttons * sizeof(*button),
714 return ERR_PTR(-ENOMEM);
716 button = (struct gpio_keys_button *)(pdata + 1);
718 pdata->buttons = button;
719 pdata->nbuttons = nbuttons;
721 pdata->rep = device_property_read_bool(dev, "autorepeat");
723 device_property_read_string(dev, "label", &pdata->name);
725 device_for_each_child_node(dev, child) {
726 if (is_of_node(child))
728 irq_of_parse_and_map(to_of_node(child), 0);
730 if (fwnode_property_read_u32(child, "linux,code",
732 dev_err(dev, "Button without keycode\n");
733 fwnode_handle_put(child);
734 return ERR_PTR(-EINVAL);
737 fwnode_property_read_string(child, "label", &button->desc);
739 if (fwnode_property_read_u32(child, "linux,input-type",
741 button->type = EV_KEY;
744 fwnode_property_read_bool(child, "wakeup-source") ||
746 fwnode_property_read_bool(child, "gpio-key,wakeup");
748 fwnode_property_read_u32(child, "wakeup-event-action",
749 &button->wakeup_event_action);
751 button->can_disable =
752 fwnode_property_read_bool(child, "linux,can-disable");
754 if (fwnode_property_read_u32(child, "debounce-interval",
755 &button->debounce_interval))
756 button->debounce_interval = 5;
764 static const struct of_device_id gpio_keys_of_match[] = {
765 { .compatible = "gpio-keys", },
768 MODULE_DEVICE_TABLE(of, gpio_keys_of_match);
770 static int gpio_keys_probe(struct platform_device *pdev)
772 struct device *dev = &pdev->dev;
773 const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
774 struct fwnode_handle *child = NULL;
775 struct gpio_keys_drvdata *ddata;
776 struct input_dev *input;
782 pdata = gpio_keys_get_devtree_pdata(dev);
784 return PTR_ERR(pdata);
787 size = sizeof(struct gpio_keys_drvdata) +
788 pdata->nbuttons * sizeof(struct gpio_button_data);
789 ddata = devm_kzalloc(dev, size, GFP_KERNEL);
791 dev_err(dev, "failed to allocate state\n");
795 ddata->keymap = devm_kcalloc(dev,
796 pdata->nbuttons, sizeof(ddata->keymap[0]),
801 input = devm_input_allocate_device(dev);
803 dev_err(dev, "failed to allocate input device\n");
807 ddata->pdata = pdata;
808 ddata->input = input;
809 mutex_init(&ddata->disable_lock);
811 platform_set_drvdata(pdev, ddata);
812 input_set_drvdata(input, ddata);
814 input->name = pdata->name ? : pdev->name;
815 input->phys = "gpio-keys/input0";
816 input->dev.parent = dev;
817 input->open = gpio_keys_open;
818 input->close = gpio_keys_close;
820 input->id.bustype = BUS_HOST;
821 input->id.vendor = 0x0001;
822 input->id.product = 0x0001;
823 input->id.version = 0x0100;
825 input->keycode = ddata->keymap;
826 input->keycodesize = sizeof(ddata->keymap[0]);
827 input->keycodemax = pdata->nbuttons;
829 /* Enable auto repeat feature of Linux input subsystem */
831 __set_bit(EV_REP, input->evbit);
833 for (i = 0; i < pdata->nbuttons; i++) {
834 const struct gpio_keys_button *button = &pdata->buttons[i];
836 if (!dev_get_platdata(dev)) {
837 child = device_get_next_child_node(dev, child);
840 "missing child device node for entry %d\n",
846 error = gpio_keys_setup_key(pdev, input, ddata,
849 fwnode_handle_put(child);
857 fwnode_handle_put(child);
859 error = devm_device_add_group(dev, &gpio_keys_attr_group);
861 dev_err(dev, "Unable to export keys/switches, error: %d\n",
866 error = input_register_device(input);
868 dev_err(dev, "Unable to register input device, error: %d\n",
873 device_init_wakeup(dev, wakeup);
878 static int __maybe_unused
879 gpio_keys_button_enable_wakeup(struct gpio_button_data *bdata)
883 error = enable_irq_wake(bdata->irq);
885 dev_err(bdata->input->dev.parent,
886 "failed to configure IRQ %d as wakeup source: %d\n",
891 if (bdata->wakeup_trigger_type) {
892 error = irq_set_irq_type(bdata->irq,
893 bdata->wakeup_trigger_type);
895 dev_err(bdata->input->dev.parent,
896 "failed to set wakeup trigger %08x for IRQ %d: %d\n",
897 bdata->wakeup_trigger_type, bdata->irq, error);
898 disable_irq_wake(bdata->irq);
906 static void __maybe_unused
907 gpio_keys_button_disable_wakeup(struct gpio_button_data *bdata)
912 * The trigger type is always both edges for gpio-based keys and we do
913 * not support changing wakeup trigger for interrupt-based keys.
915 if (bdata->wakeup_trigger_type) {
916 error = irq_set_irq_type(bdata->irq, IRQ_TYPE_EDGE_BOTH);
918 dev_warn(bdata->input->dev.parent,
919 "failed to restore interrupt trigger for IRQ %d: %d\n",
923 error = disable_irq_wake(bdata->irq);
925 dev_warn(bdata->input->dev.parent,
926 "failed to disable IRQ %d as wake source: %d\n",
930 static int __maybe_unused
931 gpio_keys_enable_wakeup(struct gpio_keys_drvdata *ddata)
933 struct gpio_button_data *bdata;
937 for (i = 0; i < ddata->pdata->nbuttons; i++) {
938 bdata = &ddata->data[i];
939 if (bdata->button->wakeup) {
940 error = gpio_keys_button_enable_wakeup(bdata);
944 bdata->suspended = true;
951 bdata = &ddata->data[i];
952 if (bdata->button->wakeup)
953 gpio_keys_button_disable_wakeup(bdata);
954 bdata->suspended = false;
960 static void __maybe_unused
961 gpio_keys_disable_wakeup(struct gpio_keys_drvdata *ddata)
963 struct gpio_button_data *bdata;
966 for (i = 0; i < ddata->pdata->nbuttons; i++) {
967 bdata = &ddata->data[i];
968 bdata->suspended = false;
969 if (irqd_is_wakeup_set(irq_get_irq_data(bdata->irq)))
970 gpio_keys_button_disable_wakeup(bdata);
974 static int __maybe_unused gpio_keys_suspend(struct device *dev)
976 struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
977 struct input_dev *input = ddata->input;
980 if (device_may_wakeup(dev)) {
981 error = gpio_keys_enable_wakeup(ddata);
985 mutex_lock(&input->mutex);
987 gpio_keys_close(input);
988 mutex_unlock(&input->mutex);
994 static int __maybe_unused gpio_keys_resume(struct device *dev)
996 struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
997 struct input_dev *input = ddata->input;
1000 if (device_may_wakeup(dev)) {
1001 gpio_keys_disable_wakeup(ddata);
1003 mutex_lock(&input->mutex);
1005 error = gpio_keys_open(input);
1006 mutex_unlock(&input->mutex);
1012 gpio_keys_report_state(ddata);
1016 static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume);
1018 static struct platform_driver gpio_keys_device_driver = {
1019 .probe = gpio_keys_probe,
1021 .name = "gpio-keys",
1022 .pm = &gpio_keys_pm_ops,
1023 .of_match_table = gpio_keys_of_match,
1027 static int __init gpio_keys_init(void)
1029 return platform_driver_register(&gpio_keys_device_driver);
1032 static void __exit gpio_keys_exit(void)
1034 platform_driver_unregister(&gpio_keys_device_driver);
1037 late_initcall(gpio_keys_init);
1038 module_exit(gpio_keys_exit);
1040 MODULE_LICENSE("GPL");
1041 MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>");
1042 MODULE_DESCRIPTION("Keyboard driver for GPIOs");
1043 MODULE_ALIAS("platform:gpio-keys");