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Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
78a56aab PB |
2 | /* |
3 | * Driver for keys on GPIO lines capable of generating interrupts. | |
4 | * | |
5 | * Copyright 2005 Phil Blundell | |
fd05d089 | 6 | * Copyright 2010, 2011 David Jander <david@protonic.nl> |
78a56aab PB |
7 | */ |
8 | ||
9 | #include <linux/module.h> | |
78a56aab | 10 | |
019002f2 | 11 | #include <linux/hrtimer.h> |
78a56aab PB |
12 | #include <linux/init.h> |
13 | #include <linux/fs.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/irq.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/pm.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
78a56aab PB |
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> | |
49015bee | 24 | #include <linux/gpio_keys.h> |
da0d03fe | 25 | #include <linux/workqueue.h> |
111bc59c | 26 | #include <linux/gpio.h> |
5feeca3c | 27 | #include <linux/gpio/consumer.h> |
415a4caa | 28 | #include <linux/of.h> |
f2d347ff | 29 | #include <linux/of_irq.h> |
d8ee4a1c | 30 | #include <linux/spinlock.h> |
83fc580d | 31 | #include <dt-bindings/input/gpio-keys.h> |
78a56aab | 32 | |
a33466e3 | 33 | struct gpio_button_data { |
d9080921 | 34 | const struct gpio_keys_button *button; |
a33466e3 | 35 | struct input_dev *input; |
5feeca3c | 36 | struct gpio_desc *gpiod; |
8ed92556 | 37 | |
83e4947a HG |
38 | unsigned short *code; |
39 | ||
019002f2 | 40 | struct hrtimer release_timer; |
8ed92556 DT |
41 | unsigned int release_delay; /* in msecs, for IRQ-only buttons */ |
42 | ||
43 | struct delayed_work work; | |
c9efb0ba | 44 | struct hrtimer debounce_timer; |
8ed92556 DT |
45 | unsigned int software_debounce; /* in msecs, for GPIO-driven buttons */ |
46 | ||
d8ee4a1c | 47 | unsigned int irq; |
83fc580d | 48 | unsigned int wakeup_trigger_type; |
d8ee4a1c | 49 | spinlock_t lock; |
9e3af04f | 50 | bool disabled; |
d8ee4a1c | 51 | bool key_pressed; |
0f107573 | 52 | bool suspended; |
c9efb0ba | 53 | bool debounce_use_hrtimer; |
a33466e3 DB |
54 | }; |
55 | ||
56 | struct gpio_keys_drvdata { | |
219edc71 | 57 | const struct gpio_keys_platform_data *pdata; |
a33466e3 | 58 | struct input_dev *input; |
9e3af04f | 59 | struct mutex disable_lock; |
83e4947a | 60 | unsigned short *keymap; |
a1b9b65e | 61 | struct gpio_button_data data[]; |
a33466e3 DB |
62 | }; |
63 | ||
9e3af04f MW |
64 | /* |
65 | * SYSFS interface for enabling/disabling keys and switches: | |
66 | * | |
67 | * There are 4 attributes under /sys/devices/platform/gpio-keys/ | |
68 | * keys [ro] - bitmap of keys (EV_KEY) which can be | |
69 | * disabled | |
70 | * switches [ro] - bitmap of switches (EV_SW) which can be | |
71 | * disabled | |
72 | * disabled_keys [rw] - bitmap of keys currently disabled | |
73 | * disabled_switches [rw] - bitmap of switches currently disabled | |
74 | * | |
75 | * Userland can change these values and hence disable event generation | |
76 | * for each key (or switch). Disabling a key means its interrupt line | |
77 | * is disabled. | |
78 | * | |
79 | * For example, if we have following switches set up as gpio-keys: | |
80 | * SW_DOCK = 5 | |
81 | * SW_CAMERA_LENS_COVER = 9 | |
82 | * SW_KEYPAD_SLIDE = 10 | |
83 | * SW_FRONT_PROXIMITY = 11 | |
84 | * This is read from switches: | |
85 | * 11-9,5 | |
86 | * Next we want to disable proximity (11) and dock (5), we write: | |
87 | * 11,5 | |
88 | * to file disabled_switches. Now proximity and dock IRQs are disabled. | |
89 | * This can be verified by reading the file disabled_switches: | |
90 | * 11,5 | |
91 | * If we now want to enable proximity (11) switch we write: | |
92 | * 5 | |
93 | * to disabled_switches. | |
94 | * | |
95 | * We can disable only those keys which don't allow sharing the irq. | |
96 | */ | |
97 | ||
98 | /** | |
99 | * get_n_events_by_type() - returns maximum number of events per @type | |
100 | * @type: type of button (%EV_KEY, %EV_SW) | |
101 | * | |
102 | * Return value of this function can be used to allocate bitmap | |
103 | * large enough to hold all bits for given type. | |
104 | */ | |
8679ee42 | 105 | static int get_n_events_by_type(int type) |
9e3af04f MW |
106 | { |
107 | BUG_ON(type != EV_SW && type != EV_KEY); | |
108 | ||
109 | return (type == EV_KEY) ? KEY_CNT : SW_CNT; | |
110 | } | |
111 | ||
8679ee42 DT |
112 | /** |
113 | * get_bm_events_by_type() - returns bitmap of supported events per @type | |
2216c0e4 | 114 | * @dev: input device from which bitmap is retrieved |
8679ee42 DT |
115 | * @type: type of button (%EV_KEY, %EV_SW) |
116 | * | |
117 | * Return value of this function can be used to allocate bitmap | |
118 | * large enough to hold all bits for given type. | |
119 | */ | |
120 | static const unsigned long *get_bm_events_by_type(struct input_dev *dev, | |
121 | int type) | |
122 | { | |
123 | BUG_ON(type != EV_SW && type != EV_KEY); | |
124 | ||
125 | return (type == EV_KEY) ? dev->keybit : dev->swbit; | |
126 | } | |
127 | ||
2531fdbf DT |
128 | static void gpio_keys_quiesce_key(void *data) |
129 | { | |
130 | struct gpio_button_data *bdata = data; | |
131 | ||
132 | if (!bdata->gpiod) | |
133 | hrtimer_cancel(&bdata->release_timer); | |
134 | if (bdata->debounce_use_hrtimer) | |
135 | hrtimer_cancel(&bdata->debounce_timer); | |
136 | else | |
137 | cancel_delayed_work_sync(&bdata->work); | |
138 | } | |
139 | ||
9e3af04f MW |
140 | /** |
141 | * gpio_keys_disable_button() - disables given GPIO button | |
142 | * @bdata: button data for button to be disabled | |
143 | * | |
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. | |
148 | * | |
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. | |
152 | */ | |
153 | static void gpio_keys_disable_button(struct gpio_button_data *bdata) | |
154 | { | |
155 | if (!bdata->disabled) { | |
156 | /* | |
8ed92556 | 157 | * Disable IRQ and associated timer/work structure. |
9e3af04f | 158 | */ |
d8ee4a1c | 159 | disable_irq(bdata->irq); |
2531fdbf | 160 | gpio_keys_quiesce_key(bdata); |
9e3af04f MW |
161 | bdata->disabled = true; |
162 | } | |
163 | } | |
164 | ||
165 | /** | |
166 | * gpio_keys_enable_button() - enables given GPIO button | |
167 | * @bdata: button data for button to be disabled | |
168 | * | |
169 | * Enables given button pointed by @bdata. | |
170 | * | |
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. | |
174 | */ | |
175 | static void gpio_keys_enable_button(struct gpio_button_data *bdata) | |
176 | { | |
177 | if (bdata->disabled) { | |
d8ee4a1c | 178 | enable_irq(bdata->irq); |
9e3af04f MW |
179 | bdata->disabled = false; |
180 | } | |
181 | } | |
182 | ||
183 | /** | |
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 | |
190 | * disabled | |
191 | * | |
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 | |
195 | * errno on failure. | |
196 | */ | |
197 | static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata, | |
198 | char *buf, unsigned int type, | |
199 | bool only_disabled) | |
200 | { | |
201 | int n_events = get_n_events_by_type(type); | |
202 | unsigned long *bits; | |
203 | ssize_t ret; | |
204 | int i; | |
205 | ||
4e2ec39d | 206 | bits = bitmap_zalloc(n_events, GFP_KERNEL); |
9e3af04f MW |
207 | if (!bits) |
208 | return -ENOMEM; | |
209 | ||
219edc71 | 210 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
9e3af04f MW |
211 | struct gpio_button_data *bdata = &ddata->data[i]; |
212 | ||
213 | if (bdata->button->type != type) | |
214 | continue; | |
215 | ||
216 | if (only_disabled && !bdata->disabled) | |
217 | continue; | |
218 | ||
83e4947a | 219 | __set_bit(*bdata->code, bits); |
9e3af04f MW |
220 | } |
221 | ||
0b480037 | 222 | ret = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", n_events, bits); |
9e3af04f MW |
223 | buf[ret++] = '\n'; |
224 | buf[ret] = '\0'; | |
225 | ||
4e2ec39d | 226 | bitmap_free(bits); |
9e3af04f MW |
227 | |
228 | return ret; | |
229 | } | |
230 | ||
231 | /** | |
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) | |
236 | * | |
237 | * This function parses stringified bitmap from @buf and disables/enables | |
a16ca239 | 238 | * GPIO buttons accordingly. Returns 0 on success and negative error |
9e3af04f MW |
239 | * on failure. |
240 | */ | |
241 | static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata, | |
242 | const char *buf, unsigned int type) | |
243 | { | |
244 | int n_events = get_n_events_by_type(type); | |
8679ee42 | 245 | const unsigned long *bitmap = get_bm_events_by_type(ddata->input, type); |
9e3af04f MW |
246 | unsigned long *bits; |
247 | ssize_t error; | |
248 | int i; | |
249 | ||
4e2ec39d | 250 | bits = bitmap_zalloc(n_events, GFP_KERNEL); |
9e3af04f MW |
251 | if (!bits) |
252 | return -ENOMEM; | |
253 | ||
254 | error = bitmap_parselist(buf, bits, n_events); | |
255 | if (error) | |
256 | goto out; | |
257 | ||
258 | /* First validate */ | |
8679ee42 DT |
259 | if (!bitmap_subset(bits, bitmap, n_events)) { |
260 | error = -EINVAL; | |
261 | goto out; | |
262 | } | |
263 | ||
219edc71 | 264 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
9e3af04f MW |
265 | struct gpio_button_data *bdata = &ddata->data[i]; |
266 | ||
267 | if (bdata->button->type != type) | |
268 | continue; | |
269 | ||
83e4947a | 270 | if (test_bit(*bdata->code, bits) && |
9e3af04f MW |
271 | !bdata->button->can_disable) { |
272 | error = -EINVAL; | |
273 | goto out; | |
274 | } | |
275 | } | |
276 | ||
277 | mutex_lock(&ddata->disable_lock); | |
278 | ||
219edc71 | 279 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
9e3af04f MW |
280 | struct gpio_button_data *bdata = &ddata->data[i]; |
281 | ||
282 | if (bdata->button->type != type) | |
283 | continue; | |
284 | ||
83e4947a | 285 | if (test_bit(*bdata->code, bits)) |
9e3af04f MW |
286 | gpio_keys_disable_button(bdata); |
287 | else | |
288 | gpio_keys_enable_button(bdata); | |
289 | } | |
290 | ||
291 | mutex_unlock(&ddata->disable_lock); | |
292 | ||
293 | out: | |
4e2ec39d | 294 | bitmap_free(bits); |
9e3af04f MW |
295 | return error; |
296 | } | |
297 | ||
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, \ | |
301 | char *buf) \ | |
302 | { \ | |
303 | struct platform_device *pdev = to_platform_device(dev); \ | |
304 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ | |
305 | \ | |
306 | return gpio_keys_attr_show_helper(ddata, buf, \ | |
307 | type, only_disabled); \ | |
308 | } | |
309 | ||
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); | |
314 | ||
315 | /* | |
316 | * ATTRIBUTES: | |
317 | * | |
318 | * /sys/devices/platform/gpio-keys/keys [ro] | |
319 | * /sys/devices/platform/gpio-keys/switches [ro] | |
320 | */ | |
321 | static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL); | |
322 | static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL); | |
323 | ||
324 | #define ATTR_STORE_FN(name, type) \ | |
325 | static ssize_t gpio_keys_store_##name(struct device *dev, \ | |
326 | struct device_attribute *attr, \ | |
327 | const char *buf, \ | |
328 | size_t count) \ | |
329 | { \ | |
330 | struct platform_device *pdev = to_platform_device(dev); \ | |
331 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ | |
332 | ssize_t error; \ | |
333 | \ | |
334 | error = gpio_keys_attr_store_helper(ddata, buf, type); \ | |
335 | if (error) \ | |
336 | return error; \ | |
337 | \ | |
338 | return count; \ | |
339 | } | |
340 | ||
341 | ATTR_STORE_FN(disabled_keys, EV_KEY); | |
342 | ATTR_STORE_FN(disabled_switches, EV_SW); | |
343 | ||
344 | /* | |
345 | * ATTRIBUTES: | |
346 | * | |
347 | * /sys/devices/platform/gpio-keys/disabled_keys [rw] | |
348 | * /sys/devices/platform/gpio-keys/disables_switches [rw] | |
349 | */ | |
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); | |
356 | ||
357 | static struct attribute *gpio_keys_attrs[] = { | |
358 | &dev_attr_keys.attr, | |
359 | &dev_attr_switches.attr, | |
360 | &dev_attr_disabled_keys.attr, | |
361 | &dev_attr_disabled_switches.attr, | |
362 | NULL, | |
363 | }; | |
cf1b2a20 | 364 | ATTRIBUTE_GROUPS(gpio_keys); |
9e3af04f | 365 | |
d8ee4a1c | 366 | static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata) |
a33466e3 | 367 | { |
d9080921 | 368 | const struct gpio_keys_button *button = bdata->button; |
ce25d7e9 | 369 | struct input_dev *input = bdata->input; |
a33466e3 | 370 | unsigned int type = button->type ?: EV_KEY; |
5feeca3c | 371 | int state; |
a33466e3 | 372 | |
c9efb0ba PC |
373 | state = bdata->debounce_use_hrtimer ? |
374 | gpiod_get_value(bdata->gpiod) : | |
375 | gpiod_get_value_cansleep(bdata->gpiod); | |
77fa0554 | 376 | if (state < 0) { |
5feeca3c GU |
377 | dev_err(input->dev.parent, |
378 | "failed to get gpio state: %d\n", state); | |
77fa0554 BA |
379 | return; |
380 | } | |
381 | ||
92a47674 AS |
382 | if (type == EV_ABS) { |
383 | if (state) | |
384 | input_event(input, type, button->code, button->value); | |
385 | } else { | |
83e4947a | 386 | input_event(input, type, *bdata->code, state); |
92a47674 | 387 | } |
a33466e3 DB |
388 | } |
389 | ||
c9efb0ba | 390 | static void gpio_keys_debounce_event(struct gpio_button_data *bdata) |
6ee88d71 | 391 | { |
d8ee4a1c | 392 | gpio_keys_gpio_report_event(bdata); |
36a8fc6f | 393 | input_sync(bdata->input); |
2fba26c6 N |
394 | |
395 | if (bdata->button->wakeup) | |
396 | pm_relax(bdata->input->dev.parent); | |
6ee88d71 DM |
397 | } |
398 | ||
c9efb0ba PC |
399 | static void gpio_keys_gpio_work_func(struct work_struct *work) |
400 | { | |
401 | struct gpio_button_data *bdata = | |
402 | container_of(work, struct gpio_button_data, work.work); | |
403 | ||
404 | gpio_keys_debounce_event(bdata); | |
405 | } | |
406 | ||
407 | static enum hrtimer_restart gpio_keys_debounce_timer(struct hrtimer *t) | |
408 | { | |
409 | struct gpio_button_data *bdata = | |
410 | container_of(t, struct gpio_button_data, debounce_timer); | |
411 | ||
412 | gpio_keys_debounce_event(bdata); | |
413 | ||
414 | return HRTIMER_NORESTART; | |
415 | } | |
416 | ||
d8ee4a1c | 417 | static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id) |
78a56aab | 418 | { |
57ffe9d5 | 419 | struct gpio_button_data *bdata = dev_id; |
78a56aab | 420 | |
d8ee4a1c | 421 | BUG_ON(irq != bdata->irq); |
84767d00 | 422 | |
0f107573 JL |
423 | if (bdata->button->wakeup) { |
424 | const struct gpio_keys_button *button = bdata->button; | |
425 | ||
2fba26c6 | 426 | pm_stay_awake(bdata->input->dev.parent); |
0f107573 JL |
427 | if (bdata->suspended && |
428 | (button->type == 0 || button->type == EV_KEY)) { | |
429 | /* | |
430 | * Simulate wakeup key press in case the key has | |
431 | * already released by the time we got interrupt | |
432 | * handler to run. | |
433 | */ | |
434 | input_report_key(bdata->input, button->code, 1); | |
435 | } | |
436 | } | |
8ed92556 | 437 | |
c9efb0ba PC |
438 | if (bdata->debounce_use_hrtimer) { |
439 | hrtimer_start(&bdata->debounce_timer, | |
440 | ms_to_ktime(bdata->software_debounce), | |
441 | HRTIMER_MODE_REL); | |
442 | } else { | |
443 | mod_delayed_work(system_wq, | |
444 | &bdata->work, | |
445 | msecs_to_jiffies(bdata->software_debounce)); | |
446 | } | |
78a56aab | 447 | |
57ffe9d5 | 448 | return IRQ_HANDLED; |
78a56aab PB |
449 | } |
450 | ||
019002f2 | 451 | static enum hrtimer_restart gpio_keys_irq_timer(struct hrtimer *t) |
d8ee4a1c | 452 | { |
019002f2 PC |
453 | struct gpio_button_data *bdata = container_of(t, |
454 | struct gpio_button_data, | |
455 | release_timer); | |
d8ee4a1c | 456 | struct input_dev *input = bdata->input; |
d8ee4a1c | 457 | |
d8ee4a1c | 458 | if (bdata->key_pressed) { |
83e4947a | 459 | input_event(input, EV_KEY, *bdata->code, 0); |
d8ee4a1c LD |
460 | input_sync(input); |
461 | bdata->key_pressed = false; | |
462 | } | |
019002f2 PC |
463 | |
464 | return HRTIMER_NORESTART; | |
d8ee4a1c LD |
465 | } |
466 | ||
467 | static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id) | |
468 | { | |
469 | struct gpio_button_data *bdata = dev_id; | |
d8ee4a1c LD |
470 | struct input_dev *input = bdata->input; |
471 | unsigned long flags; | |
472 | ||
473 | BUG_ON(irq != bdata->irq); | |
474 | ||
475 | spin_lock_irqsave(&bdata->lock, flags); | |
476 | ||
477 | if (!bdata->key_pressed) { | |
2fba26c6 N |
478 | if (bdata->button->wakeup) |
479 | pm_wakeup_event(bdata->input->dev.parent, 0); | |
480 | ||
83e4947a | 481 | input_event(input, EV_KEY, *bdata->code, 1); |
d8ee4a1c LD |
482 | input_sync(input); |
483 | ||
8ed92556 | 484 | if (!bdata->release_delay) { |
83e4947a | 485 | input_event(input, EV_KEY, *bdata->code, 0); |
d8ee4a1c LD |
486 | input_sync(input); |
487 | goto out; | |
488 | } | |
489 | ||
490 | bdata->key_pressed = true; | |
491 | } | |
492 | ||
8ed92556 | 493 | if (bdata->release_delay) |
019002f2 PC |
494 | hrtimer_start(&bdata->release_timer, |
495 | ms_to_ktime(bdata->release_delay), | |
496 | HRTIMER_MODE_REL_HARD); | |
d8ee4a1c LD |
497 | out: |
498 | spin_unlock_irqrestore(&bdata->lock, flags); | |
499 | return IRQ_HANDLED; | |
500 | } | |
501 | ||
5298cc4c BP |
502 | static int gpio_keys_setup_key(struct platform_device *pdev, |
503 | struct input_dev *input, | |
83e4947a | 504 | struct gpio_keys_drvdata *ddata, |
700a38b2 | 505 | const struct gpio_keys_button *button, |
83e4947a | 506 | int idx, |
700a38b2 | 507 | struct fwnode_handle *child) |
bc8f1eaf | 508 | { |
92a47674 | 509 | const char *desc = button->desc ? button->desc : "gpio_keys"; |
9e3af04f | 510 | struct device *dev = &pdev->dev; |
83e4947a | 511 | struct gpio_button_data *bdata = &ddata->data[idx]; |
d8ee4a1c | 512 | irq_handler_t isr; |
9e3af04f | 513 | unsigned long irqflags; |
27245519 AS |
514 | int irq; |
515 | int error; | |
bc8f1eaf | 516 | |
d9080921 DT |
517 | bdata->input = input; |
518 | bdata->button = button; | |
d8ee4a1c | 519 | spin_lock_init(&bdata->lock); |
bc8f1eaf | 520 | |
700a38b2 | 521 | if (child) { |
2a60f598 DT |
522 | bdata->gpiod = devm_fwnode_gpiod_get(dev, child, |
523 | NULL, GPIOD_IN, desc); | |
700a38b2 DT |
524 | if (IS_ERR(bdata->gpiod)) { |
525 | error = PTR_ERR(bdata->gpiod); | |
526 | if (error == -ENOENT) { | |
527 | /* | |
528 | * GPIO is optional, we may be dealing with | |
529 | * purely interrupt-driven setup. | |
530 | */ | |
531 | bdata->gpiod = NULL; | |
532 | } else { | |
533 | if (error != -EPROBE_DEFER) | |
534 | dev_err(dev, "failed to get gpio: %d\n", | |
535 | error); | |
536 | return error; | |
537 | } | |
538 | } | |
539 | } else if (gpio_is_valid(button->gpio)) { | |
540 | /* | |
541 | * Legacy GPIO number, so request the GPIO here and | |
542 | * convert it to descriptor. | |
543 | */ | |
5feeca3c GU |
544 | unsigned flags = GPIOF_IN; |
545 | ||
546 | if (button->active_low) | |
547 | flags |= GPIOF_ACTIVE_LOW; | |
bc8f1eaf | 548 | |
b4e66e7d | 549 | error = devm_gpio_request_one(dev, button->gpio, flags, desc); |
d8ee4a1c LD |
550 | if (error < 0) { |
551 | dev_err(dev, "Failed to request GPIO %d, error %d\n", | |
552 | button->gpio, error); | |
553 | return error; | |
554 | } | |
bc8f1eaf | 555 | |
5feeca3c GU |
556 | bdata->gpiod = gpio_to_desc(button->gpio); |
557 | if (!bdata->gpiod) | |
558 | return -EINVAL; | |
700a38b2 | 559 | } |
5feeca3c | 560 | |
700a38b2 | 561 | if (bdata->gpiod) { |
83fc580d JC |
562 | bool active_low = gpiod_is_active_low(bdata->gpiod); |
563 | ||
d8ee4a1c | 564 | if (button->debounce_interval) { |
5feeca3c | 565 | error = gpiod_set_debounce(bdata->gpiod, |
d8ee4a1c LD |
566 | button->debounce_interval * 1000); |
567 | /* use timer if gpiolib doesn't provide debounce */ | |
568 | if (error < 0) | |
8ed92556 | 569 | bdata->software_debounce = |
d8ee4a1c | 570 | button->debounce_interval; |
c9efb0ba PC |
571 | |
572 | /* | |
573 | * If reading the GPIO won't sleep, we can use a | |
574 | * hrtimer instead of a standard timer for the software | |
575 | * debounce, to reduce the latency as much as possible. | |
576 | */ | |
577 | bdata->debounce_use_hrtimer = | |
578 | !gpiod_cansleep(bdata->gpiod); | |
d8ee4a1c LD |
579 | } |
580 | ||
97d86e07 DT |
581 | if (button->irq) { |
582 | bdata->irq = button->irq; | |
583 | } else { | |
5feeca3c | 584 | irq = gpiod_to_irq(bdata->gpiod); |
97d86e07 DT |
585 | if (irq < 0) { |
586 | error = irq; | |
587 | dev_err(dev, | |
588 | "Unable to get irq number for GPIO %d, error %d\n", | |
589 | button->gpio, error); | |
590 | return error; | |
591 | } | |
592 | bdata->irq = irq; | |
d8ee4a1c | 593 | } |
d8ee4a1c | 594 | |
8ed92556 | 595 | INIT_DELAYED_WORK(&bdata->work, gpio_keys_gpio_work_func); |
d8ee4a1c | 596 | |
c9efb0ba PC |
597 | hrtimer_init(&bdata->debounce_timer, |
598 | CLOCK_REALTIME, HRTIMER_MODE_REL); | |
599 | bdata->debounce_timer.function = gpio_keys_debounce_timer; | |
600 | ||
d8ee4a1c LD |
601 | isr = gpio_keys_gpio_isr; |
602 | irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING; | |
603 | ||
83fc580d JC |
604 | switch (button->wakeup_event_action) { |
605 | case EV_ACT_ASSERTED: | |
606 | bdata->wakeup_trigger_type = active_low ? | |
607 | IRQ_TYPE_EDGE_FALLING : IRQ_TYPE_EDGE_RISING; | |
608 | break; | |
609 | case EV_ACT_DEASSERTED: | |
610 | bdata->wakeup_trigger_type = active_low ? | |
611 | IRQ_TYPE_EDGE_RISING : IRQ_TYPE_EDGE_FALLING; | |
612 | break; | |
613 | case EV_ACT_ANY: | |
83fc580d JC |
614 | default: |
615 | /* | |
616 | * For other cases, we are OK letting suspend/resume | |
617 | * not reconfigure the trigger type. | |
618 | */ | |
619 | break; | |
620 | } | |
d8ee4a1c LD |
621 | } else { |
622 | if (!button->irq) { | |
700a38b2 | 623 | dev_err(dev, "Found button without gpio or irq\n"); |
d8ee4a1c LD |
624 | return -EINVAL; |
625 | } | |
700a38b2 | 626 | |
d8ee4a1c LD |
627 | bdata->irq = button->irq; |
628 | ||
629 | if (button->type && button->type != EV_KEY) { | |
630 | dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n"); | |
631 | return -EINVAL; | |
632 | } | |
633 | ||
8ed92556 | 634 | bdata->release_delay = button->debounce_interval; |
019002f2 PC |
635 | hrtimer_init(&bdata->release_timer, |
636 | CLOCK_REALTIME, HRTIMER_MODE_REL_HARD); | |
637 | bdata->release_timer.function = gpio_keys_irq_timer; | |
d8ee4a1c LD |
638 | |
639 | isr = gpio_keys_irq_isr; | |
640 | irqflags = 0; | |
83fc580d JC |
641 | |
642 | /* | |
643 | * For IRQ buttons, there is no interrupt for release. | |
644 | * So we don't need to reconfigure the trigger type for wakeup. | |
645 | */ | |
bc8f1eaf BD |
646 | } |
647 | ||
83e4947a HG |
648 | bdata->code = &ddata->keymap[idx]; |
649 | *bdata->code = button->code; | |
650 | input_set_capability(input, button->type ?: EV_KEY, *bdata->code); | |
d8ee4a1c | 651 | |
27245519 | 652 | /* |
8ed92556 | 653 | * Install custom action to cancel release timer and |
27245519 AS |
654 | * workqueue item. |
655 | */ | |
b4e66e7d | 656 | error = devm_add_action(dev, gpio_keys_quiesce_key, bdata); |
27245519 | 657 | if (error) { |
b4e66e7d | 658 | dev_err(dev, "failed to register quiesce action, error: %d\n", |
27245519 AS |
659 | error); |
660 | return error; | |
661 | } | |
662 | ||
9e3af04f MW |
663 | /* |
664 | * If platform has specified that the button can be disabled, | |
665 | * we don't want it to share the interrupt line. | |
666 | */ | |
667 | if (!button->can_disable) | |
668 | irqflags |= IRQF_SHARED; | |
669 | ||
b4e66e7d GR |
670 | error = devm_request_any_context_irq(dev, bdata->irq, isr, irqflags, |
671 | desc, bdata); | |
94a8cab8 | 672 | if (error < 0) { |
bc8f1eaf | 673 | dev_err(dev, "Unable to claim irq %d; error %d\n", |
d8ee4a1c | 674 | bdata->irq, error); |
27245519 | 675 | return error; |
bc8f1eaf BD |
676 | } |
677 | ||
678 | return 0; | |
bc8f1eaf BD |
679 | } |
680 | ||
5b76d7b4 DT |
681 | static void gpio_keys_report_state(struct gpio_keys_drvdata *ddata) |
682 | { | |
683 | struct input_dev *input = ddata->input; | |
684 | int i; | |
685 | ||
686 | for (i = 0; i < ddata->pdata->nbuttons; i++) { | |
687 | struct gpio_button_data *bdata = &ddata->data[i]; | |
5feeca3c | 688 | if (bdata->gpiod) |
5b76d7b4 DT |
689 | gpio_keys_gpio_report_event(bdata); |
690 | } | |
691 | input_sync(input); | |
692 | } | |
693 | ||
173bdd74 S |
694 | static int gpio_keys_open(struct input_dev *input) |
695 | { | |
696 | struct gpio_keys_drvdata *ddata = input_get_drvdata(input); | |
219edc71 | 697 | const struct gpio_keys_platform_data *pdata = ddata->pdata; |
5b76d7b4 DT |
698 | int error; |
699 | ||
700 | if (pdata->enable) { | |
701 | error = pdata->enable(input->dev.parent); | |
702 | if (error) | |
703 | return error; | |
704 | } | |
173bdd74 | 705 | |
5b76d7b4 DT |
706 | /* Report current state of buttons that are connected to GPIOs */ |
707 | gpio_keys_report_state(ddata); | |
708 | ||
709 | return 0; | |
173bdd74 S |
710 | } |
711 | ||
712 | static void gpio_keys_close(struct input_dev *input) | |
713 | { | |
714 | struct gpio_keys_drvdata *ddata = input_get_drvdata(input); | |
219edc71 | 715 | const struct gpio_keys_platform_data *pdata = ddata->pdata; |
173bdd74 | 716 | |
219edc71 APS |
717 | if (pdata->disable) |
718 | pdata->disable(input->dev.parent); | |
173bdd74 S |
719 | } |
720 | ||
fd05d089 DJ |
721 | /* |
722 | * Handlers for alternative sources of platform_data | |
723 | */ | |
219edc71 | 724 | |
fd05d089 | 725 | /* |
700a38b2 | 726 | * Translate properties into platform_data |
fd05d089 | 727 | */ |
5298cc4c | 728 | static struct gpio_keys_platform_data * |
219edc71 | 729 | gpio_keys_get_devtree_pdata(struct device *dev) |
fd05d089 | 730 | { |
219edc71 APS |
731 | struct gpio_keys_platform_data *pdata; |
732 | struct gpio_keys_button *button; | |
700a38b2 | 733 | struct fwnode_handle *child; |
219edc71 | 734 | int nbuttons; |
fd05d089 | 735 | |
700a38b2 | 736 | nbuttons = device_get_child_node_count(dev); |
5d422f2e AS |
737 | if (nbuttons == 0) |
738 | return ERR_PTR(-ENODEV); | |
fd05d089 | 739 | |
5d422f2e AS |
740 | pdata = devm_kzalloc(dev, |
741 | sizeof(*pdata) + nbuttons * sizeof(*button), | |
742 | GFP_KERNEL); | |
743 | if (!pdata) | |
744 | return ERR_PTR(-ENOMEM); | |
fd05d089 | 745 | |
0f78ba96 DT |
746 | button = (struct gpio_keys_button *)(pdata + 1); |
747 | ||
748 | pdata->buttons = button; | |
219edc71 | 749 | pdata->nbuttons = nbuttons; |
fd05d089 | 750 | |
700a38b2 | 751 | pdata->rep = device_property_read_bool(dev, "autorepeat"); |
fd05d089 | 752 | |
700a38b2 | 753 | device_property_read_string(dev, "label", &pdata->name); |
c4dc5f8c | 754 | |
700a38b2 DT |
755 | device_for_each_child_node(dev, child) { |
756 | if (is_of_node(child)) | |
757 | button->irq = | |
758 | irq_of_parse_and_map(to_of_node(child), 0); | |
fd05d089 | 759 | |
700a38b2 DT |
760 | if (fwnode_property_read_u32(child, "linux,code", |
761 | &button->code)) { | |
762 | dev_err(dev, "Button without keycode\n"); | |
763 | fwnode_handle_put(child); | |
5d422f2e | 764 | return ERR_PTR(-EINVAL); |
219edc71 | 765 | } |
fd05d089 | 766 | |
700a38b2 | 767 | fwnode_property_read_string(child, "label", &button->desc); |
fd05d089 | 768 | |
700a38b2 DT |
769 | if (fwnode_property_read_u32(child, "linux,input-type", |
770 | &button->type)) | |
219edc71 APS |
771 | button->type = EV_KEY; |
772 | ||
700a38b2 DT |
773 | button->wakeup = |
774 | fwnode_property_read_bool(child, "wakeup-source") || | |
775 | /* legacy name */ | |
776 | fwnode_property_read_bool(child, "gpio-key,wakeup"); | |
fd05d089 | 777 | |
83fc580d JC |
778 | fwnode_property_read_u32(child, "wakeup-event-action", |
779 | &button->wakeup_event_action); | |
780 | ||
700a38b2 DT |
781 | button->can_disable = |
782 | fwnode_property_read_bool(child, "linux,can-disable"); | |
97d86e07 | 783 | |
700a38b2 | 784 | if (fwnode_property_read_u32(child, "debounce-interval", |
219edc71 APS |
785 | &button->debounce_interval)) |
786 | button->debounce_interval = 5; | |
0f78ba96 DT |
787 | |
788 | button++; | |
fd05d089 DJ |
789 | } |
790 | ||
219edc71 | 791 | return pdata; |
fd05d089 DJ |
792 | } |
793 | ||
22daae31 | 794 | static const struct of_device_id gpio_keys_of_match[] = { |
fd05d089 DJ |
795 | { .compatible = "gpio-keys", }, |
796 | { }, | |
797 | }; | |
798 | MODULE_DEVICE_TABLE(of, gpio_keys_of_match); | |
799 | ||
5298cc4c | 800 | static int gpio_keys_probe(struct platform_device *pdev) |
78a56aab | 801 | { |
db19fd8b | 802 | struct device *dev = &pdev->dev; |
219edc71 | 803 | const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev); |
700a38b2 | 804 | struct fwnode_handle *child = NULL; |
219edc71 | 805 | struct gpio_keys_drvdata *ddata; |
78a56aab PB |
806 | struct input_dev *input; |
807 | int i, error; | |
e15b0213 | 808 | int wakeup = 0; |
78a56aab | 809 | |
fd05d089 | 810 | if (!pdata) { |
219edc71 APS |
811 | pdata = gpio_keys_get_devtree_pdata(dev); |
812 | if (IS_ERR(pdata)) | |
813 | return PTR_ERR(pdata); | |
fd05d089 DJ |
814 | } |
815 | ||
002cdb95 GS |
816 | ddata = devm_kzalloc(dev, struct_size(ddata, data, pdata->nbuttons), |
817 | GFP_KERNEL); | |
5d422f2e | 818 | if (!ddata) { |
db19fd8b | 819 | dev_err(dev, "failed to allocate state\n"); |
5d422f2e AS |
820 | return -ENOMEM; |
821 | } | |
822 | ||
83e4947a HG |
823 | ddata->keymap = devm_kcalloc(dev, |
824 | pdata->nbuttons, sizeof(ddata->keymap[0]), | |
825 | GFP_KERNEL); | |
826 | if (!ddata->keymap) | |
827 | return -ENOMEM; | |
828 | ||
5d422f2e AS |
829 | input = devm_input_allocate_device(dev); |
830 | if (!input) { | |
831 | dev_err(dev, "failed to allocate input device\n"); | |
832 | return -ENOMEM; | |
a33466e3 | 833 | } |
78a56aab | 834 | |
219edc71 | 835 | ddata->pdata = pdata; |
9e3af04f | 836 | ddata->input = input; |
9e3af04f MW |
837 | mutex_init(&ddata->disable_lock); |
838 | ||
a33466e3 | 839 | platform_set_drvdata(pdev, ddata); |
173bdd74 | 840 | input_set_drvdata(input, ddata); |
78a56aab | 841 | |
46711277 | 842 | input->name = pdata->name ? : pdev->name; |
78a56aab | 843 | input->phys = "gpio-keys/input0"; |
b4e66e7d | 844 | input->dev.parent = dev; |
173bdd74 S |
845 | input->open = gpio_keys_open; |
846 | input->close = gpio_keys_close; | |
78a56aab PB |
847 | |
848 | input->id.bustype = BUS_HOST; | |
849 | input->id.vendor = 0x0001; | |
850 | input->id.product = 0x0001; | |
851 | input->id.version = 0x0100; | |
852 | ||
83e4947a HG |
853 | input->keycode = ddata->keymap; |
854 | input->keycodesize = sizeof(ddata->keymap[0]); | |
855 | input->keycodemax = pdata->nbuttons; | |
856 | ||
b67b4b11 DC |
857 | /* Enable auto repeat feature of Linux input subsystem */ |
858 | if (pdata->rep) | |
859 | __set_bit(EV_REP, input->evbit); | |
860 | ||
78a56aab | 861 | for (i = 0; i < pdata->nbuttons; i++) { |
d9080921 | 862 | const struct gpio_keys_button *button = &pdata->buttons[i]; |
78a56aab | 863 | |
700a38b2 | 864 | if (!dev_get_platdata(dev)) { |
b4e66e7d | 865 | child = device_get_next_child_node(dev, child); |
700a38b2 | 866 | if (!child) { |
b4e66e7d | 867 | dev_err(dev, |
700a38b2 DT |
868 | "missing child device node for entry %d\n", |
869 | i); | |
870 | return -EINVAL; | |
871 | } | |
872 | } | |
873 | ||
83e4947a HG |
874 | error = gpio_keys_setup_key(pdev, input, ddata, |
875 | button, i, child); | |
700a38b2 DT |
876 | if (error) { |
877 | fwnode_handle_put(child); | |
27245519 | 878 | return error; |
700a38b2 | 879 | } |
84767d00 | 880 | |
e15b0213 AS |
881 | if (button->wakeup) |
882 | wakeup = 1; | |
78a56aab PB |
883 | } |
884 | ||
700a38b2 DT |
885 | fwnode_handle_put(child); |
886 | ||
9e3af04f MW |
887 | error = input_register_device(input); |
888 | if (error) { | |
889 | dev_err(dev, "Unable to register input device, error: %d\n", | |
890 | error); | |
3184125e | 891 | return error; |
9e3af04f MW |
892 | } |
893 | ||
b4e66e7d | 894 | device_init_wakeup(dev, wakeup); |
e15b0213 | 895 | |
78a56aab PB |
896 | return 0; |
897 | } | |
898 | ||
83fc580d JC |
899 | static int __maybe_unused |
900 | gpio_keys_button_enable_wakeup(struct gpio_button_data *bdata) | |
901 | { | |
902 | int error; | |
903 | ||
904 | error = enable_irq_wake(bdata->irq); | |
905 | if (error) { | |
906 | dev_err(bdata->input->dev.parent, | |
907 | "failed to configure IRQ %d as wakeup source: %d\n", | |
908 | bdata->irq, error); | |
909 | return error; | |
910 | } | |
911 | ||
912 | if (bdata->wakeup_trigger_type) { | |
913 | error = irq_set_irq_type(bdata->irq, | |
914 | bdata->wakeup_trigger_type); | |
915 | if (error) { | |
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); | |
920 | return error; | |
921 | } | |
922 | } | |
923 | ||
924 | return 0; | |
925 | } | |
926 | ||
927 | static void __maybe_unused | |
928 | gpio_keys_button_disable_wakeup(struct gpio_button_data *bdata) | |
929 | { | |
930 | int error; | |
931 | ||
932 | /* | |
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. | |
935 | */ | |
936 | if (bdata->wakeup_trigger_type) { | |
937 | error = irq_set_irq_type(bdata->irq, IRQ_TYPE_EDGE_BOTH); | |
938 | if (error) | |
939 | dev_warn(bdata->input->dev.parent, | |
940 | "failed to restore interrupt trigger for IRQ %d: %d\n", | |
941 | bdata->irq, error); | |
942 | } | |
943 | ||
944 | error = disable_irq_wake(bdata->irq); | |
945 | if (error) | |
946 | dev_warn(bdata->input->dev.parent, | |
947 | "failed to disable IRQ %d as wake source: %d\n", | |
948 | bdata->irq, error); | |
949 | } | |
950 | ||
951 | static int __maybe_unused | |
952 | gpio_keys_enable_wakeup(struct gpio_keys_drvdata *ddata) | |
953 | { | |
954 | struct gpio_button_data *bdata; | |
955 | int error; | |
956 | int i; | |
957 | ||
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); | |
962 | if (error) | |
963 | goto err_out; | |
964 | } | |
965 | bdata->suspended = true; | |
966 | } | |
967 | ||
968 | return 0; | |
969 | ||
970 | err_out: | |
971 | while (i--) { | |
972 | bdata = &ddata->data[i]; | |
973 | if (bdata->button->wakeup) | |
974 | gpio_keys_button_disable_wakeup(bdata); | |
975 | bdata->suspended = false; | |
976 | } | |
977 | ||
978 | return error; | |
979 | } | |
980 | ||
981 | static void __maybe_unused | |
982 | gpio_keys_disable_wakeup(struct gpio_keys_drvdata *ddata) | |
983 | { | |
984 | struct gpio_button_data *bdata; | |
985 | int i; | |
986 | ||
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); | |
992 | } | |
993 | } | |
994 | ||
f9645f22 | 995 | static int __maybe_unused gpio_keys_suspend(struct device *dev) |
e15b0213 | 996 | { |
fd05d089 | 997 | struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); |
dda19a92 | 998 | struct input_dev *input = ddata->input; |
83fc580d | 999 | int error; |
e15b0213 | 1000 | |
fd05d089 | 1001 | if (device_may_wakeup(dev)) { |
83fc580d JC |
1002 | error = gpio_keys_enable_wakeup(ddata); |
1003 | if (error) | |
1004 | return error; | |
dda19a92 JA |
1005 | } else { |
1006 | mutex_lock(&input->mutex); | |
d69f0a43 | 1007 | if (input_device_enabled(input)) |
dda19a92 JA |
1008 | gpio_keys_close(input); |
1009 | mutex_unlock(&input->mutex); | |
e15b0213 AS |
1010 | } |
1011 | ||
1012 | return 0; | |
1013 | } | |
1014 | ||
f9645f22 | 1015 | static int __maybe_unused gpio_keys_resume(struct device *dev) |
e15b0213 | 1016 | { |
fd05d089 | 1017 | struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); |
dda19a92 JA |
1018 | struct input_dev *input = ddata->input; |
1019 | int error = 0; | |
e15b0213 | 1020 | |
dda19a92 | 1021 | if (device_may_wakeup(dev)) { |
83fc580d | 1022 | gpio_keys_disable_wakeup(ddata); |
dda19a92 JA |
1023 | } else { |
1024 | mutex_lock(&input->mutex); | |
d69f0a43 | 1025 | if (input_device_enabled(input)) |
dda19a92 JA |
1026 | error = gpio_keys_open(input); |
1027 | mutex_unlock(&input->mutex); | |
e15b0213 | 1028 | } |
5b76d7b4 | 1029 | |
dda19a92 JA |
1030 | if (error) |
1031 | return error; | |
e15b0213 | 1032 | |
dda19a92 | 1033 | gpio_keys_report_state(ddata); |
e15b0213 AS |
1034 | return 0; |
1035 | } | |
e15b0213 | 1036 | |
bdda8216 DT |
1037 | static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume); |
1038 | ||
a5c5e50c FF |
1039 | static void gpio_keys_shutdown(struct platform_device *pdev) |
1040 | { | |
1041 | int ret; | |
1042 | ||
1043 | ret = gpio_keys_suspend(&pdev->dev); | |
1044 | if (ret) | |
1045 | dev_err(&pdev->dev, "failed to shutdown\n"); | |
1046 | } | |
1047 | ||
9b07044c | 1048 | static struct platform_driver gpio_keys_device_driver = { |
78a56aab | 1049 | .probe = gpio_keys_probe, |
a5c5e50c | 1050 | .shutdown = gpio_keys_shutdown, |
78a56aab PB |
1051 | .driver = { |
1052 | .name = "gpio-keys", | |
ae78e0e0 | 1053 | .pm = &gpio_keys_pm_ops, |
700a38b2 | 1054 | .of_match_table = gpio_keys_of_match, |
cf1b2a20 | 1055 | .dev_groups = gpio_keys_groups, |
78a56aab PB |
1056 | } |
1057 | }; | |
1058 | ||
1059 | static int __init gpio_keys_init(void) | |
1060 | { | |
1061 | return platform_driver_register(&gpio_keys_device_driver); | |
1062 | } | |
1063 | ||
1064 | static void __exit gpio_keys_exit(void) | |
1065 | { | |
1066 | platform_driver_unregister(&gpio_keys_device_driver); | |
1067 | } | |
1068 | ||
b2330205 | 1069 | late_initcall(gpio_keys_init); |
78a56aab PB |
1070 | module_exit(gpio_keys_exit); |
1071 | ||
1072 | MODULE_LICENSE("GPL"); | |
1073 | MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>"); | |
7e2ecdf4 | 1074 | MODULE_DESCRIPTION("Keyboard driver for GPIOs"); |
d7b5247b | 1075 | MODULE_ALIAS("platform:gpio-keys"); |