1 // SPDX-License-Identifier: GPL-2.0-only
3 * Driver for keys on GPIO lines capable of generating interrupts.
5 * Copyright 2005 Phil Blundell
6 * Copyright 2010, 2011 David Jander <david@protonic.nl>
9 #include <linux/module.h>
11 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/irq.h>
15 #include <linux/sched.h>
17 #include <linux/slab.h>
18 #include <linux/sysctl.h>
19 #include <linux/proc_fs.h>
20 #include <linux/delay.h>
21 #include <linux/platform_device.h>
22 #include <linux/input.h>
23 #include <linux/gpio_keys.h>
24 #include <linux/workqueue.h>
25 #include <linux/gpio.h>
26 #include <linux/gpio/consumer.h>
28 #include <linux/of_irq.h>
29 #include <linux/spinlock.h>
30 #include <dt-bindings/input/gpio-keys.h>
32 struct gpio_button_data {
33 const struct gpio_keys_button *button;
34 struct input_dev *input;
35 struct gpio_desc *gpiod;
39 struct timer_list release_timer;
40 unsigned int release_delay; /* in msecs, for IRQ-only buttons */
42 struct delayed_work work;
43 unsigned int software_debounce; /* in msecs, for GPIO-driven buttons */
46 unsigned int wakeup_trigger_type;
53 struct gpio_keys_drvdata {
54 const struct gpio_keys_platform_data *pdata;
55 struct input_dev *input;
56 struct mutex disable_lock;
57 unsigned short *keymap;
58 struct gpio_button_data data[0];
62 * SYSFS interface for enabling/disabling keys and switches:
64 * There are 4 attributes under /sys/devices/platform/gpio-keys/
65 * keys [ro] - bitmap of keys (EV_KEY) which can be
67 * switches [ro] - bitmap of switches (EV_SW) which can be
69 * disabled_keys [rw] - bitmap of keys currently disabled
70 * disabled_switches [rw] - bitmap of switches currently disabled
72 * Userland can change these values and hence disable event generation
73 * for each key (or switch). Disabling a key means its interrupt line
76 * For example, if we have following switches set up as gpio-keys:
78 * SW_CAMERA_LENS_COVER = 9
79 * SW_KEYPAD_SLIDE = 10
80 * SW_FRONT_PROXIMITY = 11
81 * This is read from switches:
83 * Next we want to disable proximity (11) and dock (5), we write:
85 * to file disabled_switches. Now proximity and dock IRQs are disabled.
86 * This can be verified by reading the file disabled_switches:
88 * If we now want to enable proximity (11) switch we write:
90 * to disabled_switches.
92 * We can disable only those keys which don't allow sharing the irq.
96 * get_n_events_by_type() - returns maximum number of events per @type
97 * @type: type of button (%EV_KEY, %EV_SW)
99 * Return value of this function can be used to allocate bitmap
100 * large enough to hold all bits for given type.
102 static int get_n_events_by_type(int type)
104 BUG_ON(type != EV_SW && type != EV_KEY);
106 return (type == EV_KEY) ? KEY_CNT : SW_CNT;
110 * get_bm_events_by_type() - returns bitmap of supported events per @type
111 * @input: input device from which bitmap is retrieved
112 * @type: type of button (%EV_KEY, %EV_SW)
114 * Return value of this function can be used to allocate bitmap
115 * large enough to hold all bits for given type.
117 static const unsigned long *get_bm_events_by_type(struct input_dev *dev,
120 BUG_ON(type != EV_SW && type != EV_KEY);
122 return (type == EV_KEY) ? dev->keybit : dev->swbit;
126 * gpio_keys_disable_button() - disables given GPIO button
127 * @bdata: button data for button to be disabled
129 * Disables button pointed by @bdata. This is done by masking
130 * IRQ line. After this function is called, button won't generate
131 * input events anymore. Note that one can only disable buttons
132 * that don't share IRQs.
134 * Make sure that @bdata->disable_lock is locked when entering
135 * this function to avoid races when concurrent threads are
136 * disabling buttons at the same time.
138 static void gpio_keys_disable_button(struct gpio_button_data *bdata)
140 if (!bdata->disabled) {
142 * Disable IRQ and associated timer/work structure.
144 disable_irq(bdata->irq);
147 cancel_delayed_work_sync(&bdata->work);
149 del_timer_sync(&bdata->release_timer);
151 bdata->disabled = true;
156 * gpio_keys_enable_button() - enables given GPIO button
157 * @bdata: button data for button to be disabled
159 * Enables given button pointed by @bdata.
161 * Make sure that @bdata->disable_lock is locked when entering
162 * this function to avoid races with concurrent threads trying
163 * to enable the same button at the same time.
165 static void gpio_keys_enable_button(struct gpio_button_data *bdata)
167 if (bdata->disabled) {
168 enable_irq(bdata->irq);
169 bdata->disabled = false;
174 * gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons
175 * @ddata: pointer to drvdata
176 * @buf: buffer where stringified bitmap is written
177 * @type: button type (%EV_KEY, %EV_SW)
178 * @only_disabled: does caller want only those buttons that are
179 * currently disabled or all buttons that can be
182 * This function writes buttons that can be disabled to @buf. If
183 * @only_disabled is true, then @buf contains only those buttons
184 * that are currently disabled. Returns 0 on success or negative
187 static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata,
188 char *buf, unsigned int type,
191 int n_events = get_n_events_by_type(type);
196 bits = bitmap_zalloc(n_events, GFP_KERNEL);
200 for (i = 0; i < ddata->pdata->nbuttons; i++) {
201 struct gpio_button_data *bdata = &ddata->data[i];
203 if (bdata->button->type != type)
206 if (only_disabled && !bdata->disabled)
209 __set_bit(*bdata->code, bits);
212 ret = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", n_events, bits);
222 * gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap
223 * @ddata: pointer to drvdata
224 * @buf: buffer from userspace that contains stringified bitmap
225 * @type: button type (%EV_KEY, %EV_SW)
227 * This function parses stringified bitmap from @buf and disables/enables
228 * GPIO buttons accordingly. Returns 0 on success and negative error
231 static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata,
232 const char *buf, unsigned int type)
234 int n_events = get_n_events_by_type(type);
235 const unsigned long *bitmap = get_bm_events_by_type(ddata->input, type);
240 bits = bitmap_zalloc(n_events, GFP_KERNEL);
244 error = bitmap_parselist(buf, bits, n_events);
249 if (!bitmap_subset(bits, bitmap, n_events)) {
254 for (i = 0; i < ddata->pdata->nbuttons; i++) {
255 struct gpio_button_data *bdata = &ddata->data[i];
257 if (bdata->button->type != type)
260 if (test_bit(*bdata->code, bits) &&
261 !bdata->button->can_disable) {
267 mutex_lock(&ddata->disable_lock);
269 for (i = 0; i < ddata->pdata->nbuttons; i++) {
270 struct gpio_button_data *bdata = &ddata->data[i];
272 if (bdata->button->type != type)
275 if (test_bit(*bdata->code, bits))
276 gpio_keys_disable_button(bdata);
278 gpio_keys_enable_button(bdata);
281 mutex_unlock(&ddata->disable_lock);
288 #define ATTR_SHOW_FN(name, type, only_disabled) \
289 static ssize_t gpio_keys_show_##name(struct device *dev, \
290 struct device_attribute *attr, \
293 struct platform_device *pdev = to_platform_device(dev); \
294 struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
296 return gpio_keys_attr_show_helper(ddata, buf, \
297 type, only_disabled); \
300 ATTR_SHOW_FN(keys, EV_KEY, false);
301 ATTR_SHOW_FN(switches, EV_SW, false);
302 ATTR_SHOW_FN(disabled_keys, EV_KEY, true);
303 ATTR_SHOW_FN(disabled_switches, EV_SW, true);
308 * /sys/devices/platform/gpio-keys/keys [ro]
309 * /sys/devices/platform/gpio-keys/switches [ro]
311 static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL);
312 static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL);
314 #define ATTR_STORE_FN(name, type) \
315 static ssize_t gpio_keys_store_##name(struct device *dev, \
316 struct device_attribute *attr, \
320 struct platform_device *pdev = to_platform_device(dev); \
321 struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
324 error = gpio_keys_attr_store_helper(ddata, buf, type); \
331 ATTR_STORE_FN(disabled_keys, EV_KEY);
332 ATTR_STORE_FN(disabled_switches, EV_SW);
337 * /sys/devices/platform/gpio-keys/disabled_keys [rw]
338 * /sys/devices/platform/gpio-keys/disables_switches [rw]
340 static DEVICE_ATTR(disabled_keys, S_IWUSR | S_IRUGO,
341 gpio_keys_show_disabled_keys,
342 gpio_keys_store_disabled_keys);
343 static DEVICE_ATTR(disabled_switches, S_IWUSR | S_IRUGO,
344 gpio_keys_show_disabled_switches,
345 gpio_keys_store_disabled_switches);
347 static struct attribute *gpio_keys_attrs[] = {
349 &dev_attr_switches.attr,
350 &dev_attr_disabled_keys.attr,
351 &dev_attr_disabled_switches.attr,
355 static const struct attribute_group gpio_keys_attr_group = {
356 .attrs = gpio_keys_attrs,
359 static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata)
361 const struct gpio_keys_button *button = bdata->button;
362 struct input_dev *input = bdata->input;
363 unsigned int type = button->type ?: EV_KEY;
366 state = gpiod_get_value_cansleep(bdata->gpiod);
368 dev_err(input->dev.parent,
369 "failed to get gpio state: %d\n", state);
373 if (type == EV_ABS) {
375 input_event(input, type, button->code, button->value);
377 input_event(input, type, *bdata->code, state);
382 static void gpio_keys_gpio_work_func(struct work_struct *work)
384 struct gpio_button_data *bdata =
385 container_of(work, struct gpio_button_data, work.work);
387 gpio_keys_gpio_report_event(bdata);
389 if (bdata->button->wakeup)
390 pm_relax(bdata->input->dev.parent);
393 static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id)
395 struct gpio_button_data *bdata = dev_id;
397 BUG_ON(irq != bdata->irq);
399 if (bdata->button->wakeup) {
400 const struct gpio_keys_button *button = bdata->button;
402 pm_stay_awake(bdata->input->dev.parent);
403 if (bdata->suspended &&
404 (button->type == 0 || button->type == EV_KEY)) {
406 * Simulate wakeup key press in case the key has
407 * already released by the time we got interrupt
410 input_report_key(bdata->input, button->code, 1);
414 mod_delayed_work(system_wq,
416 msecs_to_jiffies(bdata->software_debounce));
421 static void gpio_keys_irq_timer(struct timer_list *t)
423 struct gpio_button_data *bdata = from_timer(bdata, t, release_timer);
424 struct input_dev *input = bdata->input;
427 spin_lock_irqsave(&bdata->lock, flags);
428 if (bdata->key_pressed) {
429 input_event(input, EV_KEY, *bdata->code, 0);
431 bdata->key_pressed = false;
433 spin_unlock_irqrestore(&bdata->lock, flags);
436 static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id)
438 struct gpio_button_data *bdata = dev_id;
439 struct input_dev *input = bdata->input;
442 BUG_ON(irq != bdata->irq);
444 spin_lock_irqsave(&bdata->lock, flags);
446 if (!bdata->key_pressed) {
447 if (bdata->button->wakeup)
448 pm_wakeup_event(bdata->input->dev.parent, 0);
450 input_event(input, EV_KEY, *bdata->code, 1);
453 if (!bdata->release_delay) {
454 input_event(input, EV_KEY, *bdata->code, 0);
459 bdata->key_pressed = true;
462 if (bdata->release_delay)
463 mod_timer(&bdata->release_timer,
464 jiffies + msecs_to_jiffies(bdata->release_delay));
466 spin_unlock_irqrestore(&bdata->lock, flags);
470 static void gpio_keys_quiesce_key(void *data)
472 struct gpio_button_data *bdata = data;
475 cancel_delayed_work_sync(&bdata->work);
477 del_timer_sync(&bdata->release_timer);
480 static int gpio_keys_setup_key(struct platform_device *pdev,
481 struct input_dev *input,
482 struct gpio_keys_drvdata *ddata,
483 const struct gpio_keys_button *button,
485 struct fwnode_handle *child)
487 const char *desc = button->desc ? button->desc : "gpio_keys";
488 struct device *dev = &pdev->dev;
489 struct gpio_button_data *bdata = &ddata->data[idx];
491 unsigned long irqflags;
495 bdata->input = input;
496 bdata->button = button;
497 spin_lock_init(&bdata->lock);
500 bdata->gpiod = devm_fwnode_get_gpiod_from_child(dev, NULL,
504 if (IS_ERR(bdata->gpiod)) {
505 error = PTR_ERR(bdata->gpiod);
506 if (error == -ENOENT) {
508 * GPIO is optional, we may be dealing with
509 * purely interrupt-driven setup.
513 if (error != -EPROBE_DEFER)
514 dev_err(dev, "failed to get gpio: %d\n",
519 } else if (gpio_is_valid(button->gpio)) {
521 * Legacy GPIO number, so request the GPIO here and
522 * convert it to descriptor.
524 unsigned flags = GPIOF_IN;
526 if (button->active_low)
527 flags |= GPIOF_ACTIVE_LOW;
529 error = devm_gpio_request_one(dev, button->gpio, flags, desc);
531 dev_err(dev, "Failed to request GPIO %d, error %d\n",
532 button->gpio, error);
536 bdata->gpiod = gpio_to_desc(button->gpio);
542 bool active_low = gpiod_is_active_low(bdata->gpiod);
544 if (button->debounce_interval) {
545 error = gpiod_set_debounce(bdata->gpiod,
546 button->debounce_interval * 1000);
547 /* use timer if gpiolib doesn't provide debounce */
549 bdata->software_debounce =
550 button->debounce_interval;
554 bdata->irq = button->irq;
556 irq = gpiod_to_irq(bdata->gpiod);
560 "Unable to get irq number for GPIO %d, error %d\n",
561 button->gpio, error);
567 INIT_DELAYED_WORK(&bdata->work, gpio_keys_gpio_work_func);
569 isr = gpio_keys_gpio_isr;
570 irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
572 switch (button->wakeup_event_action) {
573 case EV_ACT_ASSERTED:
574 bdata->wakeup_trigger_type = active_low ?
575 IRQ_TYPE_EDGE_FALLING : IRQ_TYPE_EDGE_RISING;
577 case EV_ACT_DEASSERTED:
578 bdata->wakeup_trigger_type = active_low ?
579 IRQ_TYPE_EDGE_RISING : IRQ_TYPE_EDGE_FALLING;
585 * For other cases, we are OK letting suspend/resume
586 * not reconfigure the trigger type.
592 dev_err(dev, "Found button without gpio or irq\n");
596 bdata->irq = button->irq;
598 if (button->type && button->type != EV_KEY) {
599 dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n");
603 bdata->release_delay = button->debounce_interval;
604 timer_setup(&bdata->release_timer, gpio_keys_irq_timer, 0);
606 isr = gpio_keys_irq_isr;
610 * For IRQ buttons, there is no interrupt for release.
611 * So we don't need to reconfigure the trigger type for wakeup.
615 bdata->code = &ddata->keymap[idx];
616 *bdata->code = button->code;
617 input_set_capability(input, button->type ?: EV_KEY, *bdata->code);
620 * Install custom action to cancel release timer and
623 error = devm_add_action(dev, gpio_keys_quiesce_key, bdata);
625 dev_err(dev, "failed to register quiesce action, error: %d\n",
631 * If platform has specified that the button can be disabled,
632 * we don't want it to share the interrupt line.
634 if (!button->can_disable)
635 irqflags |= IRQF_SHARED;
637 error = devm_request_any_context_irq(dev, bdata->irq, isr, irqflags,
640 dev_err(dev, "Unable to claim irq %d; error %d\n",
648 static void gpio_keys_report_state(struct gpio_keys_drvdata *ddata)
650 struct input_dev *input = ddata->input;
653 for (i = 0; i < ddata->pdata->nbuttons; i++) {
654 struct gpio_button_data *bdata = &ddata->data[i];
656 gpio_keys_gpio_report_event(bdata);
661 static int gpio_keys_open(struct input_dev *input)
663 struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
664 const struct gpio_keys_platform_data *pdata = ddata->pdata;
668 error = pdata->enable(input->dev.parent);
673 /* Report current state of buttons that are connected to GPIOs */
674 gpio_keys_report_state(ddata);
679 static void gpio_keys_close(struct input_dev *input)
681 struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
682 const struct gpio_keys_platform_data *pdata = ddata->pdata;
685 pdata->disable(input->dev.parent);
689 * Handlers for alternative sources of platform_data
693 * Translate properties into platform_data
695 static struct gpio_keys_platform_data *
696 gpio_keys_get_devtree_pdata(struct device *dev)
698 struct gpio_keys_platform_data *pdata;
699 struct gpio_keys_button *button;
700 struct fwnode_handle *child;
703 nbuttons = device_get_child_node_count(dev);
705 return ERR_PTR(-ENODEV);
707 pdata = devm_kzalloc(dev,
708 sizeof(*pdata) + nbuttons * sizeof(*button),
711 return ERR_PTR(-ENOMEM);
713 button = (struct gpio_keys_button *)(pdata + 1);
715 pdata->buttons = button;
716 pdata->nbuttons = nbuttons;
718 pdata->rep = device_property_read_bool(dev, "autorepeat");
720 device_property_read_string(dev, "label", &pdata->name);
722 device_for_each_child_node(dev, child) {
723 if (is_of_node(child))
725 irq_of_parse_and_map(to_of_node(child), 0);
727 if (fwnode_property_read_u32(child, "linux,code",
729 dev_err(dev, "Button without keycode\n");
730 fwnode_handle_put(child);
731 return ERR_PTR(-EINVAL);
734 fwnode_property_read_string(child, "label", &button->desc);
736 if (fwnode_property_read_u32(child, "linux,input-type",
738 button->type = EV_KEY;
741 fwnode_property_read_bool(child, "wakeup-source") ||
743 fwnode_property_read_bool(child, "gpio-key,wakeup");
745 fwnode_property_read_u32(child, "wakeup-event-action",
746 &button->wakeup_event_action);
748 button->can_disable =
749 fwnode_property_read_bool(child, "linux,can-disable");
751 if (fwnode_property_read_u32(child, "debounce-interval",
752 &button->debounce_interval))
753 button->debounce_interval = 5;
761 static const struct of_device_id gpio_keys_of_match[] = {
762 { .compatible = "gpio-keys", },
765 MODULE_DEVICE_TABLE(of, gpio_keys_of_match);
767 static int gpio_keys_probe(struct platform_device *pdev)
769 struct device *dev = &pdev->dev;
770 const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
771 struct fwnode_handle *child = NULL;
772 struct gpio_keys_drvdata *ddata;
773 struct input_dev *input;
779 pdata = gpio_keys_get_devtree_pdata(dev);
781 return PTR_ERR(pdata);
784 size = sizeof(struct gpio_keys_drvdata) +
785 pdata->nbuttons * sizeof(struct gpio_button_data);
786 ddata = devm_kzalloc(dev, size, GFP_KERNEL);
788 dev_err(dev, "failed to allocate state\n");
792 ddata->keymap = devm_kcalloc(dev,
793 pdata->nbuttons, sizeof(ddata->keymap[0]),
798 input = devm_input_allocate_device(dev);
800 dev_err(dev, "failed to allocate input device\n");
804 ddata->pdata = pdata;
805 ddata->input = input;
806 mutex_init(&ddata->disable_lock);
808 platform_set_drvdata(pdev, ddata);
809 input_set_drvdata(input, ddata);
811 input->name = pdata->name ? : pdev->name;
812 input->phys = "gpio-keys/input0";
813 input->dev.parent = dev;
814 input->open = gpio_keys_open;
815 input->close = gpio_keys_close;
817 input->id.bustype = BUS_HOST;
818 input->id.vendor = 0x0001;
819 input->id.product = 0x0001;
820 input->id.version = 0x0100;
822 input->keycode = ddata->keymap;
823 input->keycodesize = sizeof(ddata->keymap[0]);
824 input->keycodemax = pdata->nbuttons;
826 /* Enable auto repeat feature of Linux input subsystem */
828 __set_bit(EV_REP, input->evbit);
830 for (i = 0; i < pdata->nbuttons; i++) {
831 const struct gpio_keys_button *button = &pdata->buttons[i];
833 if (!dev_get_platdata(dev)) {
834 child = device_get_next_child_node(dev, child);
837 "missing child device node for entry %d\n",
843 error = gpio_keys_setup_key(pdev, input, ddata,
846 fwnode_handle_put(child);
854 fwnode_handle_put(child);
856 error = devm_device_add_group(dev, &gpio_keys_attr_group);
858 dev_err(dev, "Unable to export keys/switches, error: %d\n",
863 error = input_register_device(input);
865 dev_err(dev, "Unable to register input device, error: %d\n",
870 device_init_wakeup(dev, wakeup);
875 static int __maybe_unused
876 gpio_keys_button_enable_wakeup(struct gpio_button_data *bdata)
880 error = enable_irq_wake(bdata->irq);
882 dev_err(bdata->input->dev.parent,
883 "failed to configure IRQ %d as wakeup source: %d\n",
888 if (bdata->wakeup_trigger_type) {
889 error = irq_set_irq_type(bdata->irq,
890 bdata->wakeup_trigger_type);
892 dev_err(bdata->input->dev.parent,
893 "failed to set wakeup trigger %08x for IRQ %d: %d\n",
894 bdata->wakeup_trigger_type, bdata->irq, error);
895 disable_irq_wake(bdata->irq);
903 static void __maybe_unused
904 gpio_keys_button_disable_wakeup(struct gpio_button_data *bdata)
909 * The trigger type is always both edges for gpio-based keys and we do
910 * not support changing wakeup trigger for interrupt-based keys.
912 if (bdata->wakeup_trigger_type) {
913 error = irq_set_irq_type(bdata->irq, IRQ_TYPE_EDGE_BOTH);
915 dev_warn(bdata->input->dev.parent,
916 "failed to restore interrupt trigger for IRQ %d: %d\n",
920 error = disable_irq_wake(bdata->irq);
922 dev_warn(bdata->input->dev.parent,
923 "failed to disable IRQ %d as wake source: %d\n",
927 static int __maybe_unused
928 gpio_keys_enable_wakeup(struct gpio_keys_drvdata *ddata)
930 struct gpio_button_data *bdata;
934 for (i = 0; i < ddata->pdata->nbuttons; i++) {
935 bdata = &ddata->data[i];
936 if (bdata->button->wakeup) {
937 error = gpio_keys_button_enable_wakeup(bdata);
941 bdata->suspended = true;
948 bdata = &ddata->data[i];
949 if (bdata->button->wakeup)
950 gpio_keys_button_disable_wakeup(bdata);
951 bdata->suspended = false;
957 static void __maybe_unused
958 gpio_keys_disable_wakeup(struct gpio_keys_drvdata *ddata)
960 struct gpio_button_data *bdata;
963 for (i = 0; i < ddata->pdata->nbuttons; i++) {
964 bdata = &ddata->data[i];
965 bdata->suspended = false;
966 if (irqd_is_wakeup_set(irq_get_irq_data(bdata->irq)))
967 gpio_keys_button_disable_wakeup(bdata);
971 static int __maybe_unused gpio_keys_suspend(struct device *dev)
973 struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
974 struct input_dev *input = ddata->input;
977 if (device_may_wakeup(dev)) {
978 error = gpio_keys_enable_wakeup(ddata);
982 mutex_lock(&input->mutex);
984 gpio_keys_close(input);
985 mutex_unlock(&input->mutex);
991 static int __maybe_unused gpio_keys_resume(struct device *dev)
993 struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
994 struct input_dev *input = ddata->input;
997 if (device_may_wakeup(dev)) {
998 gpio_keys_disable_wakeup(ddata);
1000 mutex_lock(&input->mutex);
1002 error = gpio_keys_open(input);
1003 mutex_unlock(&input->mutex);
1009 gpio_keys_report_state(ddata);
1013 static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume);
1015 static void gpio_keys_shutdown(struct platform_device *pdev)
1019 ret = gpio_keys_suspend(&pdev->dev);
1021 dev_err(&pdev->dev, "failed to shutdown\n");
1024 static struct platform_driver gpio_keys_device_driver = {
1025 .probe = gpio_keys_probe,
1026 .shutdown = gpio_keys_shutdown,
1028 .name = "gpio-keys",
1029 .pm = &gpio_keys_pm_ops,
1030 .of_match_table = gpio_keys_of_match,
1034 static int __init gpio_keys_init(void)
1036 return platform_driver_register(&gpio_keys_device_driver);
1039 static void __exit gpio_keys_exit(void)
1041 platform_driver_unregister(&gpio_keys_device_driver);
1044 late_initcall(gpio_keys_init);
1045 module_exit(gpio_keys_exit);
1047 MODULE_LICENSE("GPL");
1048 MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>");
1049 MODULE_DESCRIPTION("Keyboard driver for GPIOs");
1050 MODULE_ALIAS("platform:gpio-keys");