Commit | Line | Data |
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78a56aab PB |
1 | /* |
2 | * Driver for keys on GPIO lines capable of generating interrupts. | |
3 | * | |
4 | * Copyright 2005 Phil Blundell | |
fd05d089 | 5 | * Copyright 2010, 2011 David Jander <david@protonic.nl> |
78a56aab PB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
78a56aab PB |
13 | |
14 | #include <linux/init.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/irq.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/pm.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
78a56aab PB |
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> | |
49015bee | 26 | #include <linux/gpio_keys.h> |
da0d03fe | 27 | #include <linux/workqueue.h> |
111bc59c | 28 | #include <linux/gpio.h> |
fd05d089 DJ |
29 | #include <linux/of_platform.h> |
30 | #include <linux/of_gpio.h> | |
d8ee4a1c | 31 | #include <linux/spinlock.h> |
78a56aab | 32 | |
a33466e3 | 33 | struct gpio_button_data { |
d9080921 | 34 | const struct gpio_keys_button *button; |
a33466e3 | 35 | struct input_dev *input; |
ca865a77 | 36 | struct timer_list timer; |
da0d03fe | 37 | struct work_struct work; |
d8ee4a1c LD |
38 | unsigned int timer_debounce; /* in msecs */ |
39 | unsigned int irq; | |
40 | spinlock_t lock; | |
9e3af04f | 41 | bool disabled; |
d8ee4a1c | 42 | bool key_pressed; |
a33466e3 DB |
43 | }; |
44 | ||
45 | struct gpio_keys_drvdata { | |
46 | struct input_dev *input; | |
9e3af04f MW |
47 | struct mutex disable_lock; |
48 | unsigned int n_buttons; | |
173bdd74 S |
49 | int (*enable)(struct device *dev); |
50 | void (*disable)(struct device *dev); | |
a33466e3 DB |
51 | struct gpio_button_data data[0]; |
52 | }; | |
53 | ||
9e3af04f MW |
54 | /* |
55 | * SYSFS interface for enabling/disabling keys and switches: | |
56 | * | |
57 | * There are 4 attributes under /sys/devices/platform/gpio-keys/ | |
58 | * keys [ro] - bitmap of keys (EV_KEY) which can be | |
59 | * disabled | |
60 | * switches [ro] - bitmap of switches (EV_SW) which can be | |
61 | * disabled | |
62 | * disabled_keys [rw] - bitmap of keys currently disabled | |
63 | * disabled_switches [rw] - bitmap of switches currently disabled | |
64 | * | |
65 | * Userland can change these values and hence disable event generation | |
66 | * for each key (or switch). Disabling a key means its interrupt line | |
67 | * is disabled. | |
68 | * | |
69 | * For example, if we have following switches set up as gpio-keys: | |
70 | * SW_DOCK = 5 | |
71 | * SW_CAMERA_LENS_COVER = 9 | |
72 | * SW_KEYPAD_SLIDE = 10 | |
73 | * SW_FRONT_PROXIMITY = 11 | |
74 | * This is read from switches: | |
75 | * 11-9,5 | |
76 | * Next we want to disable proximity (11) and dock (5), we write: | |
77 | * 11,5 | |
78 | * to file disabled_switches. Now proximity and dock IRQs are disabled. | |
79 | * This can be verified by reading the file disabled_switches: | |
80 | * 11,5 | |
81 | * If we now want to enable proximity (11) switch we write: | |
82 | * 5 | |
83 | * to disabled_switches. | |
84 | * | |
85 | * We can disable only those keys which don't allow sharing the irq. | |
86 | */ | |
87 | ||
88 | /** | |
89 | * get_n_events_by_type() - returns maximum number of events per @type | |
90 | * @type: type of button (%EV_KEY, %EV_SW) | |
91 | * | |
92 | * Return value of this function can be used to allocate bitmap | |
93 | * large enough to hold all bits for given type. | |
94 | */ | |
95 | static inline int get_n_events_by_type(int type) | |
96 | { | |
97 | BUG_ON(type != EV_SW && type != EV_KEY); | |
98 | ||
99 | return (type == EV_KEY) ? KEY_CNT : SW_CNT; | |
100 | } | |
101 | ||
102 | /** | |
103 | * gpio_keys_disable_button() - disables given GPIO button | |
104 | * @bdata: button data for button to be disabled | |
105 | * | |
106 | * Disables button pointed by @bdata. This is done by masking | |
107 | * IRQ line. After this function is called, button won't generate | |
108 | * input events anymore. Note that one can only disable buttons | |
109 | * that don't share IRQs. | |
110 | * | |
111 | * Make sure that @bdata->disable_lock is locked when entering | |
112 | * this function to avoid races when concurrent threads are | |
113 | * disabling buttons at the same time. | |
114 | */ | |
115 | static void gpio_keys_disable_button(struct gpio_button_data *bdata) | |
116 | { | |
117 | if (!bdata->disabled) { | |
118 | /* | |
119 | * Disable IRQ and possible debouncing timer. | |
120 | */ | |
d8ee4a1c | 121 | disable_irq(bdata->irq); |
28ed684f | 122 | if (bdata->timer_debounce) |
9e3af04f MW |
123 | del_timer_sync(&bdata->timer); |
124 | ||
125 | bdata->disabled = true; | |
126 | } | |
127 | } | |
128 | ||
129 | /** | |
130 | * gpio_keys_enable_button() - enables given GPIO button | |
131 | * @bdata: button data for button to be disabled | |
132 | * | |
133 | * Enables given button pointed by @bdata. | |
134 | * | |
135 | * Make sure that @bdata->disable_lock is locked when entering | |
136 | * this function to avoid races with concurrent threads trying | |
137 | * to enable the same button at the same time. | |
138 | */ | |
139 | static void gpio_keys_enable_button(struct gpio_button_data *bdata) | |
140 | { | |
141 | if (bdata->disabled) { | |
d8ee4a1c | 142 | enable_irq(bdata->irq); |
9e3af04f MW |
143 | bdata->disabled = false; |
144 | } | |
145 | } | |
146 | ||
147 | /** | |
148 | * gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons | |
149 | * @ddata: pointer to drvdata | |
150 | * @buf: buffer where stringified bitmap is written | |
151 | * @type: button type (%EV_KEY, %EV_SW) | |
152 | * @only_disabled: does caller want only those buttons that are | |
153 | * currently disabled or all buttons that can be | |
154 | * disabled | |
155 | * | |
156 | * This function writes buttons that can be disabled to @buf. If | |
157 | * @only_disabled is true, then @buf contains only those buttons | |
158 | * that are currently disabled. Returns 0 on success or negative | |
159 | * errno on failure. | |
160 | */ | |
161 | static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata, | |
162 | char *buf, unsigned int type, | |
163 | bool only_disabled) | |
164 | { | |
165 | int n_events = get_n_events_by_type(type); | |
166 | unsigned long *bits; | |
167 | ssize_t ret; | |
168 | int i; | |
169 | ||
170 | bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); | |
171 | if (!bits) | |
172 | return -ENOMEM; | |
173 | ||
174 | for (i = 0; i < ddata->n_buttons; i++) { | |
175 | struct gpio_button_data *bdata = &ddata->data[i]; | |
176 | ||
177 | if (bdata->button->type != type) | |
178 | continue; | |
179 | ||
180 | if (only_disabled && !bdata->disabled) | |
181 | continue; | |
182 | ||
183 | __set_bit(bdata->button->code, bits); | |
184 | } | |
185 | ||
186 | ret = bitmap_scnlistprintf(buf, PAGE_SIZE - 2, bits, n_events); | |
187 | buf[ret++] = '\n'; | |
188 | buf[ret] = '\0'; | |
189 | ||
190 | kfree(bits); | |
191 | ||
192 | return ret; | |
193 | } | |
194 | ||
195 | /** | |
196 | * gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap | |
197 | * @ddata: pointer to drvdata | |
198 | * @buf: buffer from userspace that contains stringified bitmap | |
199 | * @type: button type (%EV_KEY, %EV_SW) | |
200 | * | |
201 | * This function parses stringified bitmap from @buf and disables/enables | |
a16ca239 | 202 | * GPIO buttons accordingly. Returns 0 on success and negative error |
9e3af04f MW |
203 | * on failure. |
204 | */ | |
205 | static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata, | |
206 | const char *buf, unsigned int type) | |
207 | { | |
208 | int n_events = get_n_events_by_type(type); | |
209 | unsigned long *bits; | |
210 | ssize_t error; | |
211 | int i; | |
212 | ||
213 | bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); | |
214 | if (!bits) | |
215 | return -ENOMEM; | |
216 | ||
217 | error = bitmap_parselist(buf, bits, n_events); | |
218 | if (error) | |
219 | goto out; | |
220 | ||
221 | /* First validate */ | |
222 | for (i = 0; i < ddata->n_buttons; i++) { | |
223 | struct gpio_button_data *bdata = &ddata->data[i]; | |
224 | ||
225 | if (bdata->button->type != type) | |
226 | continue; | |
227 | ||
228 | if (test_bit(bdata->button->code, bits) && | |
229 | !bdata->button->can_disable) { | |
230 | error = -EINVAL; | |
231 | goto out; | |
232 | } | |
233 | } | |
234 | ||
235 | mutex_lock(&ddata->disable_lock); | |
236 | ||
237 | for (i = 0; i < ddata->n_buttons; i++) { | |
238 | struct gpio_button_data *bdata = &ddata->data[i]; | |
239 | ||
240 | if (bdata->button->type != type) | |
241 | continue; | |
242 | ||
243 | if (test_bit(bdata->button->code, bits)) | |
244 | gpio_keys_disable_button(bdata); | |
245 | else | |
246 | gpio_keys_enable_button(bdata); | |
247 | } | |
248 | ||
249 | mutex_unlock(&ddata->disable_lock); | |
250 | ||
251 | out: | |
252 | kfree(bits); | |
253 | return error; | |
254 | } | |
255 | ||
256 | #define ATTR_SHOW_FN(name, type, only_disabled) \ | |
257 | static ssize_t gpio_keys_show_##name(struct device *dev, \ | |
258 | struct device_attribute *attr, \ | |
259 | char *buf) \ | |
260 | { \ | |
261 | struct platform_device *pdev = to_platform_device(dev); \ | |
262 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ | |
263 | \ | |
264 | return gpio_keys_attr_show_helper(ddata, buf, \ | |
265 | type, only_disabled); \ | |
266 | } | |
267 | ||
268 | ATTR_SHOW_FN(keys, EV_KEY, false); | |
269 | ATTR_SHOW_FN(switches, EV_SW, false); | |
270 | ATTR_SHOW_FN(disabled_keys, EV_KEY, true); | |
271 | ATTR_SHOW_FN(disabled_switches, EV_SW, true); | |
272 | ||
273 | /* | |
274 | * ATTRIBUTES: | |
275 | * | |
276 | * /sys/devices/platform/gpio-keys/keys [ro] | |
277 | * /sys/devices/platform/gpio-keys/switches [ro] | |
278 | */ | |
279 | static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL); | |
280 | static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL); | |
281 | ||
282 | #define ATTR_STORE_FN(name, type) \ | |
283 | static ssize_t gpio_keys_store_##name(struct device *dev, \ | |
284 | struct device_attribute *attr, \ | |
285 | const char *buf, \ | |
286 | size_t count) \ | |
287 | { \ | |
288 | struct platform_device *pdev = to_platform_device(dev); \ | |
289 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ | |
290 | ssize_t error; \ | |
291 | \ | |
292 | error = gpio_keys_attr_store_helper(ddata, buf, type); \ | |
293 | if (error) \ | |
294 | return error; \ | |
295 | \ | |
296 | return count; \ | |
297 | } | |
298 | ||
299 | ATTR_STORE_FN(disabled_keys, EV_KEY); | |
300 | ATTR_STORE_FN(disabled_switches, EV_SW); | |
301 | ||
302 | /* | |
303 | * ATTRIBUTES: | |
304 | * | |
305 | * /sys/devices/platform/gpio-keys/disabled_keys [rw] | |
306 | * /sys/devices/platform/gpio-keys/disables_switches [rw] | |
307 | */ | |
308 | static DEVICE_ATTR(disabled_keys, S_IWUSR | S_IRUGO, | |
309 | gpio_keys_show_disabled_keys, | |
310 | gpio_keys_store_disabled_keys); | |
311 | static DEVICE_ATTR(disabled_switches, S_IWUSR | S_IRUGO, | |
312 | gpio_keys_show_disabled_switches, | |
313 | gpio_keys_store_disabled_switches); | |
314 | ||
315 | static struct attribute *gpio_keys_attrs[] = { | |
316 | &dev_attr_keys.attr, | |
317 | &dev_attr_switches.attr, | |
318 | &dev_attr_disabled_keys.attr, | |
319 | &dev_attr_disabled_switches.attr, | |
320 | NULL, | |
321 | }; | |
322 | ||
323 | static struct attribute_group gpio_keys_attr_group = { | |
324 | .attrs = gpio_keys_attrs, | |
325 | }; | |
326 | ||
d8ee4a1c | 327 | static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata) |
a33466e3 | 328 | { |
d9080921 | 329 | const struct gpio_keys_button *button = bdata->button; |
ce25d7e9 | 330 | struct input_dev *input = bdata->input; |
a33466e3 | 331 | unsigned int type = button->type ?: EV_KEY; |
94a8cab8 | 332 | int state = (gpio_get_value_cansleep(button->gpio) ? 1 : 0) ^ button->active_low; |
a33466e3 | 333 | |
92a47674 AS |
334 | if (type == EV_ABS) { |
335 | if (state) | |
336 | input_event(input, type, button->code, button->value); | |
337 | } else { | |
338 | input_event(input, type, button->code, !!state); | |
339 | } | |
a33466e3 DB |
340 | input_sync(input); |
341 | } | |
342 | ||
d8ee4a1c | 343 | static void gpio_keys_gpio_work_func(struct work_struct *work) |
6ee88d71 DM |
344 | { |
345 | struct gpio_button_data *bdata = | |
346 | container_of(work, struct gpio_button_data, work); | |
347 | ||
d8ee4a1c | 348 | gpio_keys_gpio_report_event(bdata); |
6ee88d71 DM |
349 | } |
350 | ||
d8ee4a1c | 351 | static void gpio_keys_gpio_timer(unsigned long _data) |
ca865a77 | 352 | { |
d8ee4a1c | 353 | struct gpio_button_data *bdata = (struct gpio_button_data *)_data; |
ca865a77 | 354 | |
d8ee4a1c | 355 | schedule_work(&bdata->work); |
ca865a77 JN |
356 | } |
357 | ||
d8ee4a1c | 358 | static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id) |
78a56aab | 359 | { |
57ffe9d5 | 360 | struct gpio_button_data *bdata = dev_id; |
78a56aab | 361 | |
d8ee4a1c | 362 | BUG_ON(irq != bdata->irq); |
84767d00 | 363 | |
28ed684f | 364 | if (bdata->timer_debounce) |
ca865a77 | 365 | mod_timer(&bdata->timer, |
28ed684f | 366 | jiffies + msecs_to_jiffies(bdata->timer_debounce)); |
ca865a77 | 367 | else |
da0d03fe | 368 | schedule_work(&bdata->work); |
78a56aab | 369 | |
57ffe9d5 | 370 | return IRQ_HANDLED; |
78a56aab PB |
371 | } |
372 | ||
d8ee4a1c LD |
373 | static void gpio_keys_irq_timer(unsigned long _data) |
374 | { | |
375 | struct gpio_button_data *bdata = (struct gpio_button_data *)_data; | |
376 | struct input_dev *input = bdata->input; | |
377 | unsigned long flags; | |
378 | ||
379 | spin_lock_irqsave(&bdata->lock, flags); | |
380 | if (bdata->key_pressed) { | |
381 | input_event(input, EV_KEY, bdata->button->code, 0); | |
382 | input_sync(input); | |
383 | bdata->key_pressed = false; | |
384 | } | |
385 | spin_unlock_irqrestore(&bdata->lock, flags); | |
386 | } | |
387 | ||
388 | static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id) | |
389 | { | |
390 | struct gpio_button_data *bdata = dev_id; | |
391 | const struct gpio_keys_button *button = bdata->button; | |
392 | struct input_dev *input = bdata->input; | |
393 | unsigned long flags; | |
394 | ||
395 | BUG_ON(irq != bdata->irq); | |
396 | ||
397 | spin_lock_irqsave(&bdata->lock, flags); | |
398 | ||
399 | if (!bdata->key_pressed) { | |
400 | input_event(input, EV_KEY, button->code, 1); | |
401 | input_sync(input); | |
402 | ||
403 | if (!bdata->timer_debounce) { | |
404 | input_event(input, EV_KEY, button->code, 0); | |
405 | input_sync(input); | |
406 | goto out; | |
407 | } | |
408 | ||
409 | bdata->key_pressed = true; | |
410 | } | |
411 | ||
412 | if (bdata->timer_debounce) | |
413 | mod_timer(&bdata->timer, | |
414 | jiffies + msecs_to_jiffies(bdata->timer_debounce)); | |
415 | out: | |
416 | spin_unlock_irqrestore(&bdata->lock, flags); | |
417 | return IRQ_HANDLED; | |
418 | } | |
419 | ||
9e3af04f | 420 | static int __devinit gpio_keys_setup_key(struct platform_device *pdev, |
d9080921 | 421 | struct input_dev *input, |
bc8f1eaf | 422 | struct gpio_button_data *bdata, |
d9080921 | 423 | const struct gpio_keys_button *button) |
bc8f1eaf | 424 | { |
92a47674 | 425 | const char *desc = button->desc ? button->desc : "gpio_keys"; |
9e3af04f | 426 | struct device *dev = &pdev->dev; |
d8ee4a1c | 427 | irq_handler_t isr; |
9e3af04f | 428 | unsigned long irqflags; |
bc8f1eaf BD |
429 | int irq, error; |
430 | ||
d9080921 DT |
431 | bdata->input = input; |
432 | bdata->button = button; | |
d8ee4a1c | 433 | spin_lock_init(&bdata->lock); |
bc8f1eaf | 434 | |
d8ee4a1c | 435 | if (gpio_is_valid(button->gpio)) { |
bc8f1eaf | 436 | |
d8ee4a1c LD |
437 | error = gpio_request(button->gpio, desc); |
438 | if (error < 0) { | |
439 | dev_err(dev, "Failed to request GPIO %d, error %d\n", | |
440 | button->gpio, error); | |
441 | return error; | |
442 | } | |
bc8f1eaf | 443 | |
d8ee4a1c LD |
444 | error = gpio_direction_input(button->gpio); |
445 | if (error < 0) { | |
446 | dev_err(dev, | |
447 | "Failed to configure direction for GPIO %d, error %d\n", | |
448 | button->gpio, error); | |
449 | goto fail; | |
450 | } | |
28ed684f | 451 | |
d8ee4a1c LD |
452 | if (button->debounce_interval) { |
453 | error = gpio_set_debounce(button->gpio, | |
454 | button->debounce_interval * 1000); | |
455 | /* use timer if gpiolib doesn't provide debounce */ | |
456 | if (error < 0) | |
457 | bdata->timer_debounce = | |
458 | button->debounce_interval; | |
459 | } | |
460 | ||
461 | irq = gpio_to_irq(button->gpio); | |
462 | if (irq < 0) { | |
463 | error = irq; | |
464 | dev_err(dev, | |
465 | "Unable to get irq number for GPIO %d, error %d\n", | |
466 | button->gpio, error); | |
467 | goto fail; | |
468 | } | |
469 | bdata->irq = irq; | |
470 | ||
471 | INIT_WORK(&bdata->work, gpio_keys_gpio_work_func); | |
472 | setup_timer(&bdata->timer, | |
473 | gpio_keys_gpio_timer, (unsigned long)bdata); | |
474 | ||
475 | isr = gpio_keys_gpio_isr; | |
476 | irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING; | |
477 | ||
478 | } else { | |
479 | if (!button->irq) { | |
480 | dev_err(dev, "No IRQ specified\n"); | |
481 | return -EINVAL; | |
482 | } | |
483 | bdata->irq = button->irq; | |
484 | ||
485 | if (button->type && button->type != EV_KEY) { | |
486 | dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n"); | |
487 | return -EINVAL; | |
488 | } | |
489 | ||
490 | bdata->timer_debounce = button->debounce_interval; | |
491 | setup_timer(&bdata->timer, | |
492 | gpio_keys_irq_timer, (unsigned long)bdata); | |
493 | ||
494 | isr = gpio_keys_irq_isr; | |
495 | irqflags = 0; | |
bc8f1eaf BD |
496 | } |
497 | ||
d8ee4a1c LD |
498 | input_set_capability(input, button->type ?: EV_KEY, button->code); |
499 | ||
9e3af04f MW |
500 | /* |
501 | * If platform has specified that the button can be disabled, | |
502 | * we don't want it to share the interrupt line. | |
503 | */ | |
504 | if (!button->can_disable) | |
505 | irqflags |= IRQF_SHARED; | |
506 | ||
d8ee4a1c | 507 | error = request_any_context_irq(bdata->irq, isr, irqflags, desc, bdata); |
94a8cab8 | 508 | if (error < 0) { |
bc8f1eaf | 509 | dev_err(dev, "Unable to claim irq %d; error %d\n", |
d8ee4a1c LD |
510 | bdata->irq, error); |
511 | goto fail; | |
bc8f1eaf BD |
512 | } |
513 | ||
514 | return 0; | |
515 | ||
d8ee4a1c LD |
516 | fail: |
517 | if (gpio_is_valid(button->gpio)) | |
518 | gpio_free(button->gpio); | |
519 | ||
bc8f1eaf BD |
520 | return error; |
521 | } | |
522 | ||
173bdd74 S |
523 | static int gpio_keys_open(struct input_dev *input) |
524 | { | |
525 | struct gpio_keys_drvdata *ddata = input_get_drvdata(input); | |
526 | ||
527 | return ddata->enable ? ddata->enable(input->dev.parent) : 0; | |
528 | } | |
529 | ||
530 | static void gpio_keys_close(struct input_dev *input) | |
531 | { | |
532 | struct gpio_keys_drvdata *ddata = input_get_drvdata(input); | |
533 | ||
534 | if (ddata->disable) | |
535 | ddata->disable(input->dev.parent); | |
536 | } | |
537 | ||
fd05d089 DJ |
538 | /* |
539 | * Handlers for alternative sources of platform_data | |
540 | */ | |
541 | #ifdef CONFIG_OF | |
542 | /* | |
543 | * Translate OpenFirmware node properties into platform_data | |
544 | */ | |
545 | static int gpio_keys_get_devtree_pdata(struct device *dev, | |
546 | struct gpio_keys_platform_data *pdata) | |
547 | { | |
548 | struct device_node *node, *pp; | |
549 | int i; | |
550 | struct gpio_keys_button *buttons; | |
cca84699 | 551 | u32 reg; |
fd05d089 DJ |
552 | |
553 | node = dev->of_node; | |
554 | if (node == NULL) | |
555 | return -ENODEV; | |
556 | ||
557 | memset(pdata, 0, sizeof *pdata); | |
558 | ||
cca84699 | 559 | pdata->rep = !!of_get_property(node, "autorepeat", NULL); |
fd05d089 DJ |
560 | |
561 | /* First count the subnodes */ | |
fd05d089 DJ |
562 | pp = NULL; |
563 | while ((pp = of_get_next_child(node, pp))) | |
564 | pdata->nbuttons++; | |
565 | ||
566 | if (pdata->nbuttons == 0) | |
567 | return -ENODEV; | |
568 | ||
569 | buttons = kzalloc(pdata->nbuttons * (sizeof *buttons), GFP_KERNEL); | |
570 | if (!buttons) | |
1f4bb066 | 571 | return -ENOMEM; |
fd05d089 DJ |
572 | |
573 | pp = NULL; | |
574 | i = 0; | |
575 | while ((pp = of_get_next_child(node, pp))) { | |
576 | enum of_gpio_flags flags; | |
577 | ||
578 | if (!of_find_property(pp, "gpios", NULL)) { | |
579 | pdata->nbuttons--; | |
580 | dev_warn(dev, "Found button without gpios\n"); | |
581 | continue; | |
582 | } | |
583 | buttons[i].gpio = of_get_gpio_flags(pp, 0, &flags); | |
584 | buttons[i].active_low = flags & OF_GPIO_ACTIVE_LOW; | |
585 | ||
cca84699 | 586 | if (of_property_read_u32(pp, "linux,code", ®)) { |
fd05d089 DJ |
587 | dev_err(dev, "Button without keycode: 0x%x\n", buttons[i].gpio); |
588 | goto out_fail; | |
589 | } | |
cca84699 | 590 | buttons[i].code = reg; |
fd05d089 | 591 | |
cca84699 | 592 | buttons[i].desc = of_get_property(pp, "label", NULL); |
fd05d089 | 593 | |
cca84699 TK |
594 | if (of_property_read_u32(pp, "linux,input-type", ®) == 0) |
595 | buttons[i].type = reg; | |
596 | else | |
597 | buttons[i].type = EV_KEY; | |
fd05d089 DJ |
598 | |
599 | buttons[i].wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL); | |
600 | ||
cca84699 TK |
601 | if (of_property_read_u32(pp, "debounce-interval", ®) == 0) |
602 | buttons[i].debounce_interval = reg; | |
603 | else | |
604 | buttons[i].debounce_interval = 5; | |
fd05d089 DJ |
605 | |
606 | i++; | |
607 | } | |
608 | ||
609 | pdata->buttons = buttons; | |
610 | ||
611 | return 0; | |
612 | ||
613 | out_fail: | |
614 | kfree(buttons); | |
615 | return -ENODEV; | |
616 | } | |
617 | ||
618 | static struct of_device_id gpio_keys_of_match[] = { | |
619 | { .compatible = "gpio-keys", }, | |
620 | { }, | |
621 | }; | |
622 | MODULE_DEVICE_TABLE(of, gpio_keys_of_match); | |
623 | ||
624 | #else | |
625 | ||
626 | static int gpio_keys_get_devtree_pdata(struct device *dev, | |
627 | struct gpio_keys_platform_data *altp) | |
628 | { | |
629 | return -ENODEV; | |
630 | } | |
631 | ||
632 | #define gpio_keys_of_match NULL | |
633 | ||
634 | #endif | |
635 | ||
a16ca239 DT |
636 | static void gpio_remove_key(struct gpio_button_data *bdata) |
637 | { | |
d8ee4a1c | 638 | free_irq(bdata->irq, bdata); |
a16ca239 DT |
639 | if (bdata->timer_debounce) |
640 | del_timer_sync(&bdata->timer); | |
641 | cancel_work_sync(&bdata->work); | |
d8ee4a1c LD |
642 | if (gpio_is_valid(bdata->button->gpio)) |
643 | gpio_free(bdata->button->gpio); | |
a16ca239 DT |
644 | } |
645 | ||
78a56aab PB |
646 | static int __devinit gpio_keys_probe(struct platform_device *pdev) |
647 | { | |
d9080921 | 648 | const struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; |
a33466e3 | 649 | struct gpio_keys_drvdata *ddata; |
db19fd8b | 650 | struct device *dev = &pdev->dev; |
fd05d089 | 651 | struct gpio_keys_platform_data alt_pdata; |
78a56aab PB |
652 | struct input_dev *input; |
653 | int i, error; | |
e15b0213 | 654 | int wakeup = 0; |
78a56aab | 655 | |
fd05d089 DJ |
656 | if (!pdata) { |
657 | error = gpio_keys_get_devtree_pdata(dev, &alt_pdata); | |
658 | if (error) | |
659 | return error; | |
660 | pdata = &alt_pdata; | |
661 | } | |
662 | ||
a33466e3 DB |
663 | ddata = kzalloc(sizeof(struct gpio_keys_drvdata) + |
664 | pdata->nbuttons * sizeof(struct gpio_button_data), | |
665 | GFP_KERNEL); | |
78a56aab | 666 | input = input_allocate_device(); |
a33466e3 | 667 | if (!ddata || !input) { |
db19fd8b | 668 | dev_err(dev, "failed to allocate state\n"); |
a33466e3 DB |
669 | error = -ENOMEM; |
670 | goto fail1; | |
671 | } | |
78a56aab | 672 | |
9e3af04f MW |
673 | ddata->input = input; |
674 | ddata->n_buttons = pdata->nbuttons; | |
173bdd74 S |
675 | ddata->enable = pdata->enable; |
676 | ddata->disable = pdata->disable; | |
9e3af04f MW |
677 | mutex_init(&ddata->disable_lock); |
678 | ||
a33466e3 | 679 | platform_set_drvdata(pdev, ddata); |
173bdd74 | 680 | input_set_drvdata(input, ddata); |
78a56aab | 681 | |
46711277 | 682 | input->name = pdata->name ? : pdev->name; |
78a56aab | 683 | input->phys = "gpio-keys/input0"; |
469ba4df | 684 | input->dev.parent = &pdev->dev; |
173bdd74 S |
685 | input->open = gpio_keys_open; |
686 | input->close = gpio_keys_close; | |
78a56aab PB |
687 | |
688 | input->id.bustype = BUS_HOST; | |
689 | input->id.vendor = 0x0001; | |
690 | input->id.product = 0x0001; | |
691 | input->id.version = 0x0100; | |
692 | ||
b67b4b11 DC |
693 | /* Enable auto repeat feature of Linux input subsystem */ |
694 | if (pdata->rep) | |
695 | __set_bit(EV_REP, input->evbit); | |
696 | ||
78a56aab | 697 | for (i = 0; i < pdata->nbuttons; i++) { |
d9080921 | 698 | const struct gpio_keys_button *button = &pdata->buttons[i]; |
a33466e3 | 699 | struct gpio_button_data *bdata = &ddata->data[i]; |
78a56aab | 700 | |
d9080921 | 701 | error = gpio_keys_setup_key(pdev, input, bdata, button); |
bc8f1eaf | 702 | if (error) |
a33466e3 | 703 | goto fail2; |
84767d00 | 704 | |
e15b0213 AS |
705 | if (button->wakeup) |
706 | wakeup = 1; | |
78a56aab PB |
707 | } |
708 | ||
9e3af04f | 709 | error = sysfs_create_group(&pdev->dev.kobj, &gpio_keys_attr_group); |
78a56aab | 710 | if (error) { |
9e3af04f MW |
711 | dev_err(dev, "Unable to export keys/switches, error: %d\n", |
712 | error); | |
a33466e3 | 713 | goto fail2; |
78a56aab PB |
714 | } |
715 | ||
9e3af04f MW |
716 | error = input_register_device(input); |
717 | if (error) { | |
718 | dev_err(dev, "Unable to register input device, error: %d\n", | |
719 | error); | |
720 | goto fail3; | |
721 | } | |
722 | ||
d8ee4a1c LD |
723 | /* get current state of buttons that are connected to GPIOs */ |
724 | for (i = 0; i < pdata->nbuttons; i++) { | |
725 | struct gpio_button_data *bdata = &ddata->data[i]; | |
726 | if (gpio_is_valid(bdata->button->gpio)) | |
727 | gpio_keys_gpio_report_event(bdata); | |
728 | } | |
6ee88d71 DM |
729 | input_sync(input); |
730 | ||
e15b0213 AS |
731 | device_init_wakeup(&pdev->dev, wakeup); |
732 | ||
78a56aab PB |
733 | return 0; |
734 | ||
9e3af04f MW |
735 | fail3: |
736 | sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); | |
a33466e3 | 737 | fail2: |
a16ca239 DT |
738 | while (--i >= 0) |
739 | gpio_remove_key(&ddata->data[i]); | |
78a56aab | 740 | |
006df302 | 741 | platform_set_drvdata(pdev, NULL); |
a33466e3 | 742 | fail1: |
78a56aab | 743 | input_free_device(input); |
a33466e3 | 744 | kfree(ddata); |
fd05d089 DJ |
745 | /* If we have no platform_data, we allocated buttons dynamically. */ |
746 | if (!pdev->dev.platform_data) | |
747 | kfree(pdata->buttons); | |
78a56aab PB |
748 | |
749 | return error; | |
750 | } | |
751 | ||
752 | static int __devexit gpio_keys_remove(struct platform_device *pdev) | |
753 | { | |
a33466e3 DB |
754 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); |
755 | struct input_dev *input = ddata->input; | |
78a56aab PB |
756 | int i; |
757 | ||
9e3af04f MW |
758 | sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); |
759 | ||
e15b0213 AS |
760 | device_init_wakeup(&pdev->dev, 0); |
761 | ||
a16ca239 DT |
762 | for (i = 0; i < ddata->n_buttons; i++) |
763 | gpio_remove_key(&ddata->data[i]); | |
78a56aab PB |
764 | |
765 | input_unregister_device(input); | |
fd05d089 DJ |
766 | |
767 | /* | |
768 | * If we had no platform_data, we allocated buttons dynamically, and | |
769 | * must free them here. ddata->data[0].button is the pointer to the | |
770 | * beginning of the allocated array. | |
771 | */ | |
772 | if (!pdev->dev.platform_data) | |
773 | kfree(ddata->data[0].button); | |
774 | ||
16382079 | 775 | kfree(ddata); |
78a56aab PB |
776 | |
777 | return 0; | |
778 | } | |
779 | ||
bdda8216 | 780 | #ifdef CONFIG_PM_SLEEP |
ae78e0e0 | 781 | static int gpio_keys_suspend(struct device *dev) |
e15b0213 | 782 | { |
fd05d089 | 783 | struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); |
e15b0213 AS |
784 | int i; |
785 | ||
fd05d089 DJ |
786 | if (device_may_wakeup(dev)) { |
787 | for (i = 0; i < ddata->n_buttons; i++) { | |
d8ee4a1c LD |
788 | struct gpio_button_data *bdata = &ddata->data[i]; |
789 | if (bdata->button->wakeup) | |
790 | enable_irq_wake(bdata->irq); | |
e15b0213 AS |
791 | } |
792 | } | |
793 | ||
794 | return 0; | |
795 | } | |
796 | ||
ae78e0e0 | 797 | static int gpio_keys_resume(struct device *dev) |
e15b0213 | 798 | { |
fd05d089 | 799 | struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); |
e15b0213 AS |
800 | int i; |
801 | ||
fd05d089 | 802 | for (i = 0; i < ddata->n_buttons; i++) { |
d8ee4a1c LD |
803 | struct gpio_button_data *bdata = &ddata->data[i]; |
804 | if (bdata->button->wakeup && device_may_wakeup(dev)) | |
805 | disable_irq_wake(bdata->irq); | |
6ee88d71 | 806 | |
d8ee4a1c LD |
807 | if (gpio_is_valid(bdata->button->gpio)) |
808 | gpio_keys_gpio_report_event(bdata); | |
e15b0213 | 809 | } |
6ee88d71 | 810 | input_sync(ddata->input); |
e15b0213 AS |
811 | |
812 | return 0; | |
813 | } | |
e15b0213 AS |
814 | #endif |
815 | ||
bdda8216 DT |
816 | static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume); |
817 | ||
9b07044c | 818 | static struct platform_driver gpio_keys_device_driver = { |
78a56aab PB |
819 | .probe = gpio_keys_probe, |
820 | .remove = __devexit_p(gpio_keys_remove), | |
821 | .driver = { | |
822 | .name = "gpio-keys", | |
d7b5247b | 823 | .owner = THIS_MODULE, |
ae78e0e0 | 824 | .pm = &gpio_keys_pm_ops, |
fd05d089 | 825 | .of_match_table = gpio_keys_of_match, |
78a56aab PB |
826 | } |
827 | }; | |
828 | ||
829 | static int __init gpio_keys_init(void) | |
830 | { | |
831 | return platform_driver_register(&gpio_keys_device_driver); | |
832 | } | |
833 | ||
834 | static void __exit gpio_keys_exit(void) | |
835 | { | |
836 | platform_driver_unregister(&gpio_keys_device_driver); | |
837 | } | |
838 | ||
b2330205 | 839 | late_initcall(gpio_keys_init); |
78a56aab PB |
840 | module_exit(gpio_keys_exit); |
841 | ||
842 | MODULE_LICENSE("GPL"); | |
843 | MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>"); | |
7e2ecdf4 | 844 | MODULE_DESCRIPTION("Keyboard driver for GPIOs"); |
d7b5247b | 845 | MODULE_ALIAS("platform:gpio-keys"); |