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/hrtimer.h>
12 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/irq.h>
16 #include <linux/sched.h>
18 #include <linux/slab.h>
19 #include <linux/sysctl.h>
20 #include <linux/proc_fs.h>
21 #include <linux/delay.h>
22 #include <linux/platform_device.h>
23 #include <linux/input.h>
24 #include <linux/gpio_keys.h>
25 #include <linux/workqueue.h>
26 #include <linux/gpio.h>
27 #include <linux/gpio/consumer.h>
29 #include <linux/of_irq.h>
30 #include <linux/spinlock.h>
31 #include <dt-bindings/input/gpio-keys.h>
33 struct gpio_button_data {
34 const struct gpio_keys_button *button;
35 struct input_dev *input;
36 struct gpio_desc *gpiod;
40 struct hrtimer release_timer;
41 unsigned int release_delay; /* in msecs, for IRQ-only buttons */
43 struct delayed_work work;
44 struct hrtimer debounce_timer;
45 unsigned int software_debounce; /* in msecs, for GPIO-driven buttons */
48 unsigned int wakeup_trigger_type;
53 bool debounce_use_hrtimer;
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[];
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 * @dev: 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;
128 static void gpio_keys_quiesce_key(void *data)
130 struct gpio_button_data *bdata = data;
133 hrtimer_cancel(&bdata->release_timer);
134 else if (bdata->debounce_use_hrtimer)
135 hrtimer_cancel(&bdata->debounce_timer);
137 cancel_delayed_work_sync(&bdata->work);
141 * gpio_keys_disable_button() - disables given GPIO button
142 * @bdata: button data for button to be disabled
144 * Disables button pointed by @bdata. This is done by masking
145 * IRQ line. After this function is called, button won't generate
146 * input events anymore. Note that one can only disable buttons
147 * that don't share IRQs.
149 * Make sure that @bdata->disable_lock is locked when entering
150 * this function to avoid races when concurrent threads are
151 * disabling buttons at the same time.
153 static void gpio_keys_disable_button(struct gpio_button_data *bdata)
155 if (!bdata->disabled) {
157 * Disable IRQ and associated timer/work structure.
159 disable_irq(bdata->irq);
160 gpio_keys_quiesce_key(bdata);
161 bdata->disabled = true;
166 * gpio_keys_enable_button() - enables given GPIO button
167 * @bdata: button data for button to be disabled
169 * Enables given button pointed by @bdata.
171 * Make sure that @bdata->disable_lock is locked when entering
172 * this function to avoid races with concurrent threads trying
173 * to enable the same button at the same time.
175 static void gpio_keys_enable_button(struct gpio_button_data *bdata)
177 if (bdata->disabled) {
178 enable_irq(bdata->irq);
179 bdata->disabled = false;
184 * gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons
185 * @ddata: pointer to drvdata
186 * @buf: buffer where stringified bitmap is written
187 * @type: button type (%EV_KEY, %EV_SW)
188 * @only_disabled: does caller want only those buttons that are
189 * currently disabled or all buttons that can be
192 * This function writes buttons that can be disabled to @buf. If
193 * @only_disabled is true, then @buf contains only those buttons
194 * that are currently disabled. Returns 0 on success or negative
197 static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata,
198 char *buf, unsigned int type,
201 int n_events = get_n_events_by_type(type);
206 bits = bitmap_zalloc(n_events, GFP_KERNEL);
210 for (i = 0; i < ddata->pdata->nbuttons; i++) {
211 struct gpio_button_data *bdata = &ddata->data[i];
213 if (bdata->button->type != type)
216 if (only_disabled && !bdata->disabled)
219 __set_bit(*bdata->code, bits);
222 ret = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", n_events, bits);
232 * gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap
233 * @ddata: pointer to drvdata
234 * @buf: buffer from userspace that contains stringified bitmap
235 * @type: button type (%EV_KEY, %EV_SW)
237 * This function parses stringified bitmap from @buf and disables/enables
238 * GPIO buttons accordingly. Returns 0 on success and negative error
241 static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata,
242 const char *buf, unsigned int type)
244 int n_events = get_n_events_by_type(type);
245 const unsigned long *bitmap = get_bm_events_by_type(ddata->input, type);
250 bits = bitmap_alloc(n_events, GFP_KERNEL);
254 error = bitmap_parselist(buf, bits, n_events);
259 if (!bitmap_subset(bits, bitmap, n_events)) {
264 for (i = 0; i < ddata->pdata->nbuttons; i++) {
265 struct gpio_button_data *bdata = &ddata->data[i];
267 if (bdata->button->type != type)
270 if (test_bit(*bdata->code, bits) &&
271 !bdata->button->can_disable) {
277 mutex_lock(&ddata->disable_lock);
279 for (i = 0; i < ddata->pdata->nbuttons; i++) {
280 struct gpio_button_data *bdata = &ddata->data[i];
282 if (bdata->button->type != type)
285 if (test_bit(*bdata->code, bits))
286 gpio_keys_disable_button(bdata);
288 gpio_keys_enable_button(bdata);
291 mutex_unlock(&ddata->disable_lock);
298 #define ATTR_SHOW_FN(name, type, only_disabled) \
299 static ssize_t gpio_keys_show_##name(struct device *dev, \
300 struct device_attribute *attr, \
303 struct platform_device *pdev = to_platform_device(dev); \
304 struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
306 return gpio_keys_attr_show_helper(ddata, buf, \
307 type, only_disabled); \
310 ATTR_SHOW_FN(keys, EV_KEY, false);
311 ATTR_SHOW_FN(switches, EV_SW, false);
312 ATTR_SHOW_FN(disabled_keys, EV_KEY, true);
313 ATTR_SHOW_FN(disabled_switches, EV_SW, true);
318 * /sys/devices/platform/gpio-keys/keys [ro]
319 * /sys/devices/platform/gpio-keys/switches [ro]
321 static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL);
322 static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL);
324 #define ATTR_STORE_FN(name, type) \
325 static ssize_t gpio_keys_store_##name(struct device *dev, \
326 struct device_attribute *attr, \
330 struct platform_device *pdev = to_platform_device(dev); \
331 struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \
334 error = gpio_keys_attr_store_helper(ddata, buf, type); \
341 ATTR_STORE_FN(disabled_keys, EV_KEY);
342 ATTR_STORE_FN(disabled_switches, EV_SW);
347 * /sys/devices/platform/gpio-keys/disabled_keys [rw]
348 * /sys/devices/platform/gpio-keys/disables_switches [rw]
350 static DEVICE_ATTR(disabled_keys, S_IWUSR | S_IRUGO,
351 gpio_keys_show_disabled_keys,
352 gpio_keys_store_disabled_keys);
353 static DEVICE_ATTR(disabled_switches, S_IWUSR | S_IRUGO,
354 gpio_keys_show_disabled_switches,
355 gpio_keys_store_disabled_switches);
357 static struct attribute *gpio_keys_attrs[] = {
359 &dev_attr_switches.attr,
360 &dev_attr_disabled_keys.attr,
361 &dev_attr_disabled_switches.attr,
364 ATTRIBUTE_GROUPS(gpio_keys);
366 static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata)
368 const struct gpio_keys_button *button = bdata->button;
369 struct input_dev *input = bdata->input;
370 unsigned int type = button->type ?: EV_KEY;
373 state = bdata->debounce_use_hrtimer ?
374 gpiod_get_value(bdata->gpiod) :
375 gpiod_get_value_cansleep(bdata->gpiod);
377 dev_err(input->dev.parent,
378 "failed to get gpio state: %d\n", state);
382 if (type == EV_ABS) {
384 input_event(input, type, button->code, button->value);
386 input_event(input, type, *bdata->code, state);
390 static void gpio_keys_debounce_event(struct gpio_button_data *bdata)
392 gpio_keys_gpio_report_event(bdata);
393 input_sync(bdata->input);
395 if (bdata->button->wakeup)
396 pm_relax(bdata->input->dev.parent);
399 static void gpio_keys_gpio_work_func(struct work_struct *work)
401 struct gpio_button_data *bdata =
402 container_of(work, struct gpio_button_data, work.work);
404 gpio_keys_debounce_event(bdata);
407 static enum hrtimer_restart gpio_keys_debounce_timer(struct hrtimer *t)
409 struct gpio_button_data *bdata =
410 container_of(t, struct gpio_button_data, debounce_timer);
412 gpio_keys_debounce_event(bdata);
414 return HRTIMER_NORESTART;
417 static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id)
419 struct gpio_button_data *bdata = dev_id;
421 BUG_ON(irq != bdata->irq);
423 if (bdata->button->wakeup) {
424 const struct gpio_keys_button *button = bdata->button;
426 pm_stay_awake(bdata->input->dev.parent);
427 if (bdata->suspended &&
428 (button->type == 0 || button->type == EV_KEY)) {
430 * Simulate wakeup key press in case the key has
431 * already released by the time we got interrupt
434 input_report_key(bdata->input, button->code, 1);
438 if (bdata->debounce_use_hrtimer) {
439 hrtimer_start(&bdata->debounce_timer,
440 ms_to_ktime(bdata->software_debounce),
443 mod_delayed_work(system_wq,
445 msecs_to_jiffies(bdata->software_debounce));
451 static enum hrtimer_restart gpio_keys_irq_timer(struct hrtimer *t)
453 struct gpio_button_data *bdata = container_of(t,
454 struct gpio_button_data,
456 struct input_dev *input = bdata->input;
458 if (bdata->key_pressed) {
459 input_report_key(input, *bdata->code, 0);
461 bdata->key_pressed = false;
464 return HRTIMER_NORESTART;
467 static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id)
469 struct gpio_button_data *bdata = dev_id;
470 struct input_dev *input = bdata->input;
473 BUG_ON(irq != bdata->irq);
475 spin_lock_irqsave(&bdata->lock, flags);
477 if (!bdata->key_pressed) {
478 if (bdata->button->wakeup)
479 pm_wakeup_event(bdata->input->dev.parent, 0);
481 input_report_key(input, *bdata->code, 1);
484 if (!bdata->release_delay) {
485 input_report_key(input, *bdata->code, 0);
490 bdata->key_pressed = true;
493 if (bdata->release_delay)
494 hrtimer_start(&bdata->release_timer,
495 ms_to_ktime(bdata->release_delay),
496 HRTIMER_MODE_REL_HARD);
498 spin_unlock_irqrestore(&bdata->lock, flags);
502 static int gpio_keys_setup_key(struct platform_device *pdev,
503 struct input_dev *input,
504 struct gpio_keys_drvdata *ddata,
505 const struct gpio_keys_button *button,
507 struct fwnode_handle *child)
509 const char *desc = button->desc ? button->desc : "gpio_keys";
510 struct device *dev = &pdev->dev;
511 struct gpio_button_data *bdata = &ddata->data[idx];
513 unsigned long irqflags;
517 bdata->input = input;
518 bdata->button = button;
519 spin_lock_init(&bdata->lock);
522 bdata->gpiod = devm_fwnode_gpiod_get(dev, child,
523 NULL, GPIOD_IN, desc);
524 if (IS_ERR(bdata->gpiod)) {
525 error = PTR_ERR(bdata->gpiod);
526 if (error != -ENOENT)
527 return dev_err_probe(dev, error,
528 "failed to get gpio\n");
531 * GPIO is optional, we may be dealing with
532 * purely interrupt-driven setup.
536 } else if (gpio_is_valid(button->gpio)) {
538 * Legacy GPIO number, so request the GPIO here and
539 * convert it to descriptor.
541 unsigned flags = GPIOF_IN;
543 if (button->active_low)
544 flags |= GPIOF_ACTIVE_LOW;
546 error = devm_gpio_request_one(dev, button->gpio, flags, desc);
548 dev_err(dev, "Failed to request GPIO %d, error %d\n",
549 button->gpio, error);
553 bdata->gpiod = gpio_to_desc(button->gpio);
559 bool active_low = gpiod_is_active_low(bdata->gpiod);
561 if (button->debounce_interval) {
562 error = gpiod_set_debounce(bdata->gpiod,
563 button->debounce_interval * 1000);
564 /* use timer if gpiolib doesn't provide debounce */
566 bdata->software_debounce =
567 button->debounce_interval;
570 * If reading the GPIO won't sleep, we can use a
571 * hrtimer instead of a standard timer for the software
572 * debounce, to reduce the latency as much as possible.
574 bdata->debounce_use_hrtimer =
575 !gpiod_cansleep(bdata->gpiod);
579 bdata->irq = button->irq;
581 irq = gpiod_to_irq(bdata->gpiod);
585 "Unable to get irq number for GPIO %d, error %d\n",
586 button->gpio, error);
592 INIT_DELAYED_WORK(&bdata->work, gpio_keys_gpio_work_func);
594 hrtimer_init(&bdata->debounce_timer,
595 CLOCK_REALTIME, HRTIMER_MODE_REL);
596 bdata->debounce_timer.function = gpio_keys_debounce_timer;
598 isr = gpio_keys_gpio_isr;
599 irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
601 switch (button->wakeup_event_action) {
602 case EV_ACT_ASSERTED:
603 bdata->wakeup_trigger_type = active_low ?
604 IRQ_TYPE_EDGE_FALLING : IRQ_TYPE_EDGE_RISING;
606 case EV_ACT_DEASSERTED:
607 bdata->wakeup_trigger_type = active_low ?
608 IRQ_TYPE_EDGE_RISING : IRQ_TYPE_EDGE_FALLING;
613 * For other cases, we are OK letting suspend/resume
614 * not reconfigure the trigger type.
620 dev_err(dev, "Found button without gpio or irq\n");
624 bdata->irq = button->irq;
626 if (button->type && button->type != EV_KEY) {
627 dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n");
631 bdata->release_delay = button->debounce_interval;
632 hrtimer_init(&bdata->release_timer,
633 CLOCK_REALTIME, HRTIMER_MODE_REL_HARD);
634 bdata->release_timer.function = gpio_keys_irq_timer;
636 isr = gpio_keys_irq_isr;
640 * For IRQ buttons, there is no interrupt for release.
641 * So we don't need to reconfigure the trigger type for wakeup.
645 bdata->code = &ddata->keymap[idx];
646 *bdata->code = button->code;
647 input_set_capability(input, button->type ?: EV_KEY, *bdata->code);
650 * Install custom action to cancel release timer and
653 error = devm_add_action(dev, gpio_keys_quiesce_key, bdata);
655 dev_err(dev, "failed to register quiesce action, error: %d\n",
661 * If platform has specified that the button can be disabled,
662 * we don't want it to share the interrupt line.
664 if (!button->can_disable)
665 irqflags |= IRQF_SHARED;
667 error = devm_request_any_context_irq(dev, bdata->irq, isr, irqflags,
670 dev_err(dev, "Unable to claim irq %d; error %d\n",
678 static void gpio_keys_report_state(struct gpio_keys_drvdata *ddata)
680 struct input_dev *input = ddata->input;
683 for (i = 0; i < ddata->pdata->nbuttons; i++) {
684 struct gpio_button_data *bdata = &ddata->data[i];
686 gpio_keys_gpio_report_event(bdata);
691 static int gpio_keys_open(struct input_dev *input)
693 struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
694 const struct gpio_keys_platform_data *pdata = ddata->pdata;
698 error = pdata->enable(input->dev.parent);
703 /* Report current state of buttons that are connected to GPIOs */
704 gpio_keys_report_state(ddata);
709 static void gpio_keys_close(struct input_dev *input)
711 struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
712 const struct gpio_keys_platform_data *pdata = ddata->pdata;
715 pdata->disable(input->dev.parent);
719 * Handlers for alternative sources of platform_data
723 * Translate properties into platform_data
725 static struct gpio_keys_platform_data *
726 gpio_keys_get_devtree_pdata(struct device *dev)
728 struct gpio_keys_platform_data *pdata;
729 struct gpio_keys_button *button;
730 struct fwnode_handle *child;
733 nbuttons = device_get_child_node_count(dev);
735 return ERR_PTR(-ENODEV);
737 pdata = devm_kzalloc(dev,
738 sizeof(*pdata) + nbuttons * sizeof(*button),
741 return ERR_PTR(-ENOMEM);
743 button = (struct gpio_keys_button *)(pdata + 1);
745 pdata->buttons = button;
746 pdata->nbuttons = nbuttons;
748 pdata->rep = device_property_read_bool(dev, "autorepeat");
750 device_property_read_string(dev, "label", &pdata->name);
752 device_for_each_child_node(dev, child) {
753 if (is_of_node(child))
755 irq_of_parse_and_map(to_of_node(child), 0);
757 if (fwnode_property_read_u32(child, "linux,code",
759 dev_err(dev, "Button without keycode\n");
760 fwnode_handle_put(child);
761 return ERR_PTR(-EINVAL);
764 fwnode_property_read_string(child, "label", &button->desc);
766 if (fwnode_property_read_u32(child, "linux,input-type",
768 button->type = EV_KEY;
770 fwnode_property_read_u32(child, "linux,input-value",
771 (u32 *)&button->value);
774 fwnode_property_read_bool(child, "wakeup-source") ||
776 fwnode_property_read_bool(child, "gpio-key,wakeup");
778 fwnode_property_read_u32(child, "wakeup-event-action",
779 &button->wakeup_event_action);
781 button->can_disable =
782 fwnode_property_read_bool(child, "linux,can-disable");
784 if (fwnode_property_read_u32(child, "debounce-interval",
785 &button->debounce_interval))
786 button->debounce_interval = 5;
794 static const struct of_device_id gpio_keys_of_match[] = {
795 { .compatible = "gpio-keys", },
798 MODULE_DEVICE_TABLE(of, gpio_keys_of_match);
800 static int gpio_keys_probe(struct platform_device *pdev)
802 struct device *dev = &pdev->dev;
803 const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev);
804 struct fwnode_handle *child = NULL;
805 struct gpio_keys_drvdata *ddata;
806 struct input_dev *input;
811 pdata = gpio_keys_get_devtree_pdata(dev);
813 return PTR_ERR(pdata);
816 ddata = devm_kzalloc(dev, struct_size(ddata, data, pdata->nbuttons),
819 dev_err(dev, "failed to allocate state\n");
823 ddata->keymap = devm_kcalloc(dev,
824 pdata->nbuttons, sizeof(ddata->keymap[0]),
829 input = devm_input_allocate_device(dev);
831 dev_err(dev, "failed to allocate input device\n");
835 ddata->pdata = pdata;
836 ddata->input = input;
837 mutex_init(&ddata->disable_lock);
839 platform_set_drvdata(pdev, ddata);
840 input_set_drvdata(input, ddata);
842 input->name = pdata->name ? : pdev->name;
843 input->phys = "gpio-keys/input0";
844 input->dev.parent = dev;
845 input->open = gpio_keys_open;
846 input->close = gpio_keys_close;
848 input->id.bustype = BUS_HOST;
849 input->id.vendor = 0x0001;
850 input->id.product = 0x0001;
851 input->id.version = 0x0100;
853 input->keycode = ddata->keymap;
854 input->keycodesize = sizeof(ddata->keymap[0]);
855 input->keycodemax = pdata->nbuttons;
857 /* Enable auto repeat feature of Linux input subsystem */
859 __set_bit(EV_REP, input->evbit);
861 for (i = 0; i < pdata->nbuttons; i++) {
862 const struct gpio_keys_button *button = &pdata->buttons[i];
864 if (!dev_get_platdata(dev)) {
865 child = device_get_next_child_node(dev, child);
868 "missing child device node for entry %d\n",
874 error = gpio_keys_setup_key(pdev, input, ddata,
877 fwnode_handle_put(child);
885 fwnode_handle_put(child);
887 error = input_register_device(input);
889 dev_err(dev, "Unable to register input device, error: %d\n",
894 device_init_wakeup(dev, wakeup);
899 static int __maybe_unused
900 gpio_keys_button_enable_wakeup(struct gpio_button_data *bdata)
904 error = enable_irq_wake(bdata->irq);
906 dev_err(bdata->input->dev.parent,
907 "failed to configure IRQ %d as wakeup source: %d\n",
912 if (bdata->wakeup_trigger_type) {
913 error = irq_set_irq_type(bdata->irq,
914 bdata->wakeup_trigger_type);
916 dev_err(bdata->input->dev.parent,
917 "failed to set wakeup trigger %08x for IRQ %d: %d\n",
918 bdata->wakeup_trigger_type, bdata->irq, error);
919 disable_irq_wake(bdata->irq);
927 static void __maybe_unused
928 gpio_keys_button_disable_wakeup(struct gpio_button_data *bdata)
933 * The trigger type is always both edges for gpio-based keys and we do
934 * not support changing wakeup trigger for interrupt-based keys.
936 if (bdata->wakeup_trigger_type) {
937 error = irq_set_irq_type(bdata->irq, IRQ_TYPE_EDGE_BOTH);
939 dev_warn(bdata->input->dev.parent,
940 "failed to restore interrupt trigger for IRQ %d: %d\n",
944 error = disable_irq_wake(bdata->irq);
946 dev_warn(bdata->input->dev.parent,
947 "failed to disable IRQ %d as wake source: %d\n",
951 static int __maybe_unused
952 gpio_keys_enable_wakeup(struct gpio_keys_drvdata *ddata)
954 struct gpio_button_data *bdata;
958 for (i = 0; i < ddata->pdata->nbuttons; i++) {
959 bdata = &ddata->data[i];
960 if (bdata->button->wakeup) {
961 error = gpio_keys_button_enable_wakeup(bdata);
965 bdata->suspended = true;
972 bdata = &ddata->data[i];
973 if (bdata->button->wakeup)
974 gpio_keys_button_disable_wakeup(bdata);
975 bdata->suspended = false;
981 static void __maybe_unused
982 gpio_keys_disable_wakeup(struct gpio_keys_drvdata *ddata)
984 struct gpio_button_data *bdata;
987 for (i = 0; i < ddata->pdata->nbuttons; i++) {
988 bdata = &ddata->data[i];
989 bdata->suspended = false;
990 if (irqd_is_wakeup_set(irq_get_irq_data(bdata->irq)))
991 gpio_keys_button_disable_wakeup(bdata);
995 static int gpio_keys_suspend(struct device *dev)
997 struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
998 struct input_dev *input = ddata->input;
1001 if (device_may_wakeup(dev)) {
1002 error = gpio_keys_enable_wakeup(ddata);
1006 mutex_lock(&input->mutex);
1007 if (input_device_enabled(input))
1008 gpio_keys_close(input);
1009 mutex_unlock(&input->mutex);
1015 static int gpio_keys_resume(struct device *dev)
1017 struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
1018 struct input_dev *input = ddata->input;
1021 if (device_may_wakeup(dev)) {
1022 gpio_keys_disable_wakeup(ddata);
1024 mutex_lock(&input->mutex);
1025 if (input_device_enabled(input))
1026 error = gpio_keys_open(input);
1027 mutex_unlock(&input->mutex);
1033 gpio_keys_report_state(ddata);
1037 static DEFINE_SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume);
1039 static void gpio_keys_shutdown(struct platform_device *pdev)
1043 ret = gpio_keys_suspend(&pdev->dev);
1045 dev_err(&pdev->dev, "failed to shutdown\n");
1048 static struct platform_driver gpio_keys_device_driver = {
1049 .probe = gpio_keys_probe,
1050 .shutdown = gpio_keys_shutdown,
1052 .name = "gpio-keys",
1053 .pm = pm_sleep_ptr(&gpio_keys_pm_ops),
1054 .of_match_table = gpio_keys_of_match,
1055 .dev_groups = gpio_keys_groups,
1059 static int __init gpio_keys_init(void)
1061 return platform_driver_register(&gpio_keys_device_driver);
1064 static void __exit gpio_keys_exit(void)
1066 platform_driver_unregister(&gpio_keys_device_driver);
1069 late_initcall(gpio_keys_init);
1070 module_exit(gpio_keys_exit);
1072 MODULE_LICENSE("GPL");
1073 MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>");
1074 MODULE_DESCRIPTION("Keyboard driver for GPIOs");
1075 MODULE_ALIAS("platform:gpio-keys");