]>
Commit | Line | Data |
---|---|---|
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 { | |
219edc71 | 46 | const struct gpio_keys_platform_data *pdata; |
a33466e3 | 47 | struct input_dev *input; |
9e3af04f | 48 | struct mutex disable_lock; |
a33466e3 DB |
49 | struct gpio_button_data data[0]; |
50 | }; | |
51 | ||
9e3af04f MW |
52 | /* |
53 | * SYSFS interface for enabling/disabling keys and switches: | |
54 | * | |
55 | * There are 4 attributes under /sys/devices/platform/gpio-keys/ | |
56 | * keys [ro] - bitmap of keys (EV_KEY) which can be | |
57 | * disabled | |
58 | * switches [ro] - bitmap of switches (EV_SW) which can be | |
59 | * disabled | |
60 | * disabled_keys [rw] - bitmap of keys currently disabled | |
61 | * disabled_switches [rw] - bitmap of switches currently disabled | |
62 | * | |
63 | * Userland can change these values and hence disable event generation | |
64 | * for each key (or switch). Disabling a key means its interrupt line | |
65 | * is disabled. | |
66 | * | |
67 | * For example, if we have following switches set up as gpio-keys: | |
68 | * SW_DOCK = 5 | |
69 | * SW_CAMERA_LENS_COVER = 9 | |
70 | * SW_KEYPAD_SLIDE = 10 | |
71 | * SW_FRONT_PROXIMITY = 11 | |
72 | * This is read from switches: | |
73 | * 11-9,5 | |
74 | * Next we want to disable proximity (11) and dock (5), we write: | |
75 | * 11,5 | |
76 | * to file disabled_switches. Now proximity and dock IRQs are disabled. | |
77 | * This can be verified by reading the file disabled_switches: | |
78 | * 11,5 | |
79 | * If we now want to enable proximity (11) switch we write: | |
80 | * 5 | |
81 | * to disabled_switches. | |
82 | * | |
83 | * We can disable only those keys which don't allow sharing the irq. | |
84 | */ | |
85 | ||
86 | /** | |
87 | * get_n_events_by_type() - returns maximum number of events per @type | |
88 | * @type: type of button (%EV_KEY, %EV_SW) | |
89 | * | |
90 | * Return value of this function can be used to allocate bitmap | |
91 | * large enough to hold all bits for given type. | |
92 | */ | |
93 | static inline int get_n_events_by_type(int type) | |
94 | { | |
95 | BUG_ON(type != EV_SW && type != EV_KEY); | |
96 | ||
97 | return (type == EV_KEY) ? KEY_CNT : SW_CNT; | |
98 | } | |
99 | ||
100 | /** | |
101 | * gpio_keys_disable_button() - disables given GPIO button | |
102 | * @bdata: button data for button to be disabled | |
103 | * | |
104 | * Disables button pointed by @bdata. This is done by masking | |
105 | * IRQ line. After this function is called, button won't generate | |
106 | * input events anymore. Note that one can only disable buttons | |
107 | * that don't share IRQs. | |
108 | * | |
109 | * Make sure that @bdata->disable_lock is locked when entering | |
110 | * this function to avoid races when concurrent threads are | |
111 | * disabling buttons at the same time. | |
112 | */ | |
113 | static void gpio_keys_disable_button(struct gpio_button_data *bdata) | |
114 | { | |
115 | if (!bdata->disabled) { | |
116 | /* | |
117 | * Disable IRQ and possible debouncing timer. | |
118 | */ | |
d8ee4a1c | 119 | disable_irq(bdata->irq); |
28ed684f | 120 | if (bdata->timer_debounce) |
9e3af04f MW |
121 | del_timer_sync(&bdata->timer); |
122 | ||
123 | bdata->disabled = true; | |
124 | } | |
125 | } | |
126 | ||
127 | /** | |
128 | * gpio_keys_enable_button() - enables given GPIO button | |
129 | * @bdata: button data for button to be disabled | |
130 | * | |
131 | * Enables given button pointed by @bdata. | |
132 | * | |
133 | * Make sure that @bdata->disable_lock is locked when entering | |
134 | * this function to avoid races with concurrent threads trying | |
135 | * to enable the same button at the same time. | |
136 | */ | |
137 | static void gpio_keys_enable_button(struct gpio_button_data *bdata) | |
138 | { | |
139 | if (bdata->disabled) { | |
d8ee4a1c | 140 | enable_irq(bdata->irq); |
9e3af04f MW |
141 | bdata->disabled = false; |
142 | } | |
143 | } | |
144 | ||
145 | /** | |
146 | * gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons | |
147 | * @ddata: pointer to drvdata | |
148 | * @buf: buffer where stringified bitmap is written | |
149 | * @type: button type (%EV_KEY, %EV_SW) | |
150 | * @only_disabled: does caller want only those buttons that are | |
151 | * currently disabled or all buttons that can be | |
152 | * disabled | |
153 | * | |
154 | * This function writes buttons that can be disabled to @buf. If | |
155 | * @only_disabled is true, then @buf contains only those buttons | |
156 | * that are currently disabled. Returns 0 on success or negative | |
157 | * errno on failure. | |
158 | */ | |
159 | static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata, | |
160 | char *buf, unsigned int type, | |
161 | bool only_disabled) | |
162 | { | |
163 | int n_events = get_n_events_by_type(type); | |
164 | unsigned long *bits; | |
165 | ssize_t ret; | |
166 | int i; | |
167 | ||
168 | bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); | |
169 | if (!bits) | |
170 | return -ENOMEM; | |
171 | ||
219edc71 | 172 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
9e3af04f MW |
173 | struct gpio_button_data *bdata = &ddata->data[i]; |
174 | ||
175 | if (bdata->button->type != type) | |
176 | continue; | |
177 | ||
178 | if (only_disabled && !bdata->disabled) | |
179 | continue; | |
180 | ||
181 | __set_bit(bdata->button->code, bits); | |
182 | } | |
183 | ||
184 | ret = bitmap_scnlistprintf(buf, PAGE_SIZE - 2, bits, n_events); | |
185 | buf[ret++] = '\n'; | |
186 | buf[ret] = '\0'; | |
187 | ||
188 | kfree(bits); | |
189 | ||
190 | return ret; | |
191 | } | |
192 | ||
193 | /** | |
194 | * gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap | |
195 | * @ddata: pointer to drvdata | |
196 | * @buf: buffer from userspace that contains stringified bitmap | |
197 | * @type: button type (%EV_KEY, %EV_SW) | |
198 | * | |
199 | * This function parses stringified bitmap from @buf and disables/enables | |
a16ca239 | 200 | * GPIO buttons accordingly. Returns 0 on success and negative error |
9e3af04f MW |
201 | * on failure. |
202 | */ | |
203 | static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata, | |
204 | const char *buf, unsigned int type) | |
205 | { | |
206 | int n_events = get_n_events_by_type(type); | |
207 | unsigned long *bits; | |
208 | ssize_t error; | |
209 | int i; | |
210 | ||
211 | bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); | |
212 | if (!bits) | |
213 | return -ENOMEM; | |
214 | ||
215 | error = bitmap_parselist(buf, bits, n_events); | |
216 | if (error) | |
217 | goto out; | |
218 | ||
219 | /* First validate */ | |
219edc71 | 220 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
9e3af04f MW |
221 | struct gpio_button_data *bdata = &ddata->data[i]; |
222 | ||
223 | if (bdata->button->type != type) | |
224 | continue; | |
225 | ||
226 | if (test_bit(bdata->button->code, bits) && | |
227 | !bdata->button->can_disable) { | |
228 | error = -EINVAL; | |
229 | goto out; | |
230 | } | |
231 | } | |
232 | ||
233 | mutex_lock(&ddata->disable_lock); | |
234 | ||
219edc71 | 235 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
9e3af04f MW |
236 | struct gpio_button_data *bdata = &ddata->data[i]; |
237 | ||
238 | if (bdata->button->type != type) | |
239 | continue; | |
240 | ||
241 | if (test_bit(bdata->button->code, bits)) | |
242 | gpio_keys_disable_button(bdata); | |
243 | else | |
244 | gpio_keys_enable_button(bdata); | |
245 | } | |
246 | ||
247 | mutex_unlock(&ddata->disable_lock); | |
248 | ||
249 | out: | |
250 | kfree(bits); | |
251 | return error; | |
252 | } | |
253 | ||
254 | #define ATTR_SHOW_FN(name, type, only_disabled) \ | |
255 | static ssize_t gpio_keys_show_##name(struct device *dev, \ | |
256 | struct device_attribute *attr, \ | |
257 | char *buf) \ | |
258 | { \ | |
259 | struct platform_device *pdev = to_platform_device(dev); \ | |
260 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ | |
261 | \ | |
262 | return gpio_keys_attr_show_helper(ddata, buf, \ | |
263 | type, only_disabled); \ | |
264 | } | |
265 | ||
266 | ATTR_SHOW_FN(keys, EV_KEY, false); | |
267 | ATTR_SHOW_FN(switches, EV_SW, false); | |
268 | ATTR_SHOW_FN(disabled_keys, EV_KEY, true); | |
269 | ATTR_SHOW_FN(disabled_switches, EV_SW, true); | |
270 | ||
271 | /* | |
272 | * ATTRIBUTES: | |
273 | * | |
274 | * /sys/devices/platform/gpio-keys/keys [ro] | |
275 | * /sys/devices/platform/gpio-keys/switches [ro] | |
276 | */ | |
277 | static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL); | |
278 | static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL); | |
279 | ||
280 | #define ATTR_STORE_FN(name, type) \ | |
281 | static ssize_t gpio_keys_store_##name(struct device *dev, \ | |
282 | struct device_attribute *attr, \ | |
283 | const char *buf, \ | |
284 | size_t count) \ | |
285 | { \ | |
286 | struct platform_device *pdev = to_platform_device(dev); \ | |
287 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ | |
288 | ssize_t error; \ | |
289 | \ | |
290 | error = gpio_keys_attr_store_helper(ddata, buf, type); \ | |
291 | if (error) \ | |
292 | return error; \ | |
293 | \ | |
294 | return count; \ | |
295 | } | |
296 | ||
297 | ATTR_STORE_FN(disabled_keys, EV_KEY); | |
298 | ATTR_STORE_FN(disabled_switches, EV_SW); | |
299 | ||
300 | /* | |
301 | * ATTRIBUTES: | |
302 | * | |
303 | * /sys/devices/platform/gpio-keys/disabled_keys [rw] | |
304 | * /sys/devices/platform/gpio-keys/disables_switches [rw] | |
305 | */ | |
306 | static DEVICE_ATTR(disabled_keys, S_IWUSR | S_IRUGO, | |
307 | gpio_keys_show_disabled_keys, | |
308 | gpio_keys_store_disabled_keys); | |
309 | static DEVICE_ATTR(disabled_switches, S_IWUSR | S_IRUGO, | |
310 | gpio_keys_show_disabled_switches, | |
311 | gpio_keys_store_disabled_switches); | |
312 | ||
313 | static struct attribute *gpio_keys_attrs[] = { | |
314 | &dev_attr_keys.attr, | |
315 | &dev_attr_switches.attr, | |
316 | &dev_attr_disabled_keys.attr, | |
317 | &dev_attr_disabled_switches.attr, | |
318 | NULL, | |
319 | }; | |
320 | ||
321 | static struct attribute_group gpio_keys_attr_group = { | |
322 | .attrs = gpio_keys_attrs, | |
323 | }; | |
324 | ||
d8ee4a1c | 325 | static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata) |
a33466e3 | 326 | { |
d9080921 | 327 | const struct gpio_keys_button *button = bdata->button; |
ce25d7e9 | 328 | struct input_dev *input = bdata->input; |
a33466e3 | 329 | unsigned int type = button->type ?: EV_KEY; |
94a8cab8 | 330 | int state = (gpio_get_value_cansleep(button->gpio) ? 1 : 0) ^ button->active_low; |
a33466e3 | 331 | |
92a47674 AS |
332 | if (type == EV_ABS) { |
333 | if (state) | |
334 | input_event(input, type, button->code, button->value); | |
335 | } else { | |
336 | input_event(input, type, button->code, !!state); | |
337 | } | |
a33466e3 DB |
338 | input_sync(input); |
339 | } | |
340 | ||
d8ee4a1c | 341 | static void gpio_keys_gpio_work_func(struct work_struct *work) |
6ee88d71 DM |
342 | { |
343 | struct gpio_button_data *bdata = | |
344 | container_of(work, struct gpio_button_data, work); | |
345 | ||
d8ee4a1c | 346 | gpio_keys_gpio_report_event(bdata); |
2fba26c6 N |
347 | |
348 | if (bdata->button->wakeup) | |
349 | pm_relax(bdata->input->dev.parent); | |
6ee88d71 DM |
350 | } |
351 | ||
d8ee4a1c | 352 | static void gpio_keys_gpio_timer(unsigned long _data) |
ca865a77 | 353 | { |
d8ee4a1c | 354 | struct gpio_button_data *bdata = (struct gpio_button_data *)_data; |
ca865a77 | 355 | |
d8ee4a1c | 356 | schedule_work(&bdata->work); |
ca865a77 JN |
357 | } |
358 | ||
d8ee4a1c | 359 | static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id) |
78a56aab | 360 | { |
57ffe9d5 | 361 | struct gpio_button_data *bdata = dev_id; |
78a56aab | 362 | |
d8ee4a1c | 363 | BUG_ON(irq != bdata->irq); |
84767d00 | 364 | |
2fba26c6 N |
365 | if (bdata->button->wakeup) |
366 | pm_stay_awake(bdata->input->dev.parent); | |
28ed684f | 367 | if (bdata->timer_debounce) |
ca865a77 | 368 | mod_timer(&bdata->timer, |
28ed684f | 369 | jiffies + msecs_to_jiffies(bdata->timer_debounce)); |
ca865a77 | 370 | else |
da0d03fe | 371 | schedule_work(&bdata->work); |
78a56aab | 372 | |
57ffe9d5 | 373 | return IRQ_HANDLED; |
78a56aab PB |
374 | } |
375 | ||
d8ee4a1c LD |
376 | static void gpio_keys_irq_timer(unsigned long _data) |
377 | { | |
378 | struct gpio_button_data *bdata = (struct gpio_button_data *)_data; | |
379 | struct input_dev *input = bdata->input; | |
380 | unsigned long flags; | |
381 | ||
382 | spin_lock_irqsave(&bdata->lock, flags); | |
383 | if (bdata->key_pressed) { | |
384 | input_event(input, EV_KEY, bdata->button->code, 0); | |
385 | input_sync(input); | |
386 | bdata->key_pressed = false; | |
387 | } | |
388 | spin_unlock_irqrestore(&bdata->lock, flags); | |
389 | } | |
390 | ||
391 | static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id) | |
392 | { | |
393 | struct gpio_button_data *bdata = dev_id; | |
394 | const struct gpio_keys_button *button = bdata->button; | |
395 | struct input_dev *input = bdata->input; | |
396 | unsigned long flags; | |
397 | ||
398 | BUG_ON(irq != bdata->irq); | |
399 | ||
400 | spin_lock_irqsave(&bdata->lock, flags); | |
401 | ||
402 | if (!bdata->key_pressed) { | |
2fba26c6 N |
403 | if (bdata->button->wakeup) |
404 | pm_wakeup_event(bdata->input->dev.parent, 0); | |
405 | ||
d8ee4a1c LD |
406 | input_event(input, EV_KEY, button->code, 1); |
407 | input_sync(input); | |
408 | ||
409 | if (!bdata->timer_debounce) { | |
410 | input_event(input, EV_KEY, button->code, 0); | |
411 | input_sync(input); | |
412 | goto out; | |
413 | } | |
414 | ||
415 | bdata->key_pressed = true; | |
416 | } | |
417 | ||
418 | if (bdata->timer_debounce) | |
419 | mod_timer(&bdata->timer, | |
420 | jiffies + msecs_to_jiffies(bdata->timer_debounce)); | |
421 | out: | |
422 | spin_unlock_irqrestore(&bdata->lock, flags); | |
423 | return IRQ_HANDLED; | |
424 | } | |
425 | ||
9e3af04f | 426 | static int __devinit gpio_keys_setup_key(struct platform_device *pdev, |
d9080921 | 427 | struct input_dev *input, |
bc8f1eaf | 428 | struct gpio_button_data *bdata, |
d9080921 | 429 | const struct gpio_keys_button *button) |
bc8f1eaf | 430 | { |
92a47674 | 431 | const char *desc = button->desc ? button->desc : "gpio_keys"; |
9e3af04f | 432 | struct device *dev = &pdev->dev; |
d8ee4a1c | 433 | irq_handler_t isr; |
9e3af04f | 434 | unsigned long irqflags; |
bc8f1eaf BD |
435 | int irq, error; |
436 | ||
d9080921 DT |
437 | bdata->input = input; |
438 | bdata->button = button; | |
d8ee4a1c | 439 | spin_lock_init(&bdata->lock); |
bc8f1eaf | 440 | |
d8ee4a1c | 441 | if (gpio_is_valid(button->gpio)) { |
bc8f1eaf | 442 | |
d8ee4a1c LD |
443 | error = gpio_request(button->gpio, desc); |
444 | if (error < 0) { | |
445 | dev_err(dev, "Failed to request GPIO %d, error %d\n", | |
446 | button->gpio, error); | |
447 | return error; | |
448 | } | |
bc8f1eaf | 449 | |
d8ee4a1c LD |
450 | error = gpio_direction_input(button->gpio); |
451 | if (error < 0) { | |
452 | dev_err(dev, | |
453 | "Failed to configure direction for GPIO %d, error %d\n", | |
454 | button->gpio, error); | |
455 | goto fail; | |
456 | } | |
28ed684f | 457 | |
d8ee4a1c LD |
458 | if (button->debounce_interval) { |
459 | error = gpio_set_debounce(button->gpio, | |
460 | button->debounce_interval * 1000); | |
461 | /* use timer if gpiolib doesn't provide debounce */ | |
462 | if (error < 0) | |
463 | bdata->timer_debounce = | |
464 | button->debounce_interval; | |
465 | } | |
466 | ||
467 | irq = gpio_to_irq(button->gpio); | |
468 | if (irq < 0) { | |
469 | error = irq; | |
470 | dev_err(dev, | |
471 | "Unable to get irq number for GPIO %d, error %d\n", | |
472 | button->gpio, error); | |
473 | goto fail; | |
474 | } | |
475 | bdata->irq = irq; | |
476 | ||
477 | INIT_WORK(&bdata->work, gpio_keys_gpio_work_func); | |
478 | setup_timer(&bdata->timer, | |
479 | gpio_keys_gpio_timer, (unsigned long)bdata); | |
480 | ||
481 | isr = gpio_keys_gpio_isr; | |
482 | irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING; | |
483 | ||
484 | } else { | |
485 | if (!button->irq) { | |
486 | dev_err(dev, "No IRQ specified\n"); | |
487 | return -EINVAL; | |
488 | } | |
489 | bdata->irq = button->irq; | |
490 | ||
491 | if (button->type && button->type != EV_KEY) { | |
492 | dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n"); | |
493 | return -EINVAL; | |
494 | } | |
495 | ||
496 | bdata->timer_debounce = button->debounce_interval; | |
497 | setup_timer(&bdata->timer, | |
498 | gpio_keys_irq_timer, (unsigned long)bdata); | |
499 | ||
500 | isr = gpio_keys_irq_isr; | |
501 | irqflags = 0; | |
bc8f1eaf BD |
502 | } |
503 | ||
d8ee4a1c LD |
504 | input_set_capability(input, button->type ?: EV_KEY, button->code); |
505 | ||
9e3af04f MW |
506 | /* |
507 | * If platform has specified that the button can be disabled, | |
508 | * we don't want it to share the interrupt line. | |
509 | */ | |
510 | if (!button->can_disable) | |
511 | irqflags |= IRQF_SHARED; | |
512 | ||
d8ee4a1c | 513 | error = request_any_context_irq(bdata->irq, isr, irqflags, desc, bdata); |
94a8cab8 | 514 | if (error < 0) { |
bc8f1eaf | 515 | dev_err(dev, "Unable to claim irq %d; error %d\n", |
d8ee4a1c LD |
516 | bdata->irq, error); |
517 | goto fail; | |
bc8f1eaf BD |
518 | } |
519 | ||
520 | return 0; | |
521 | ||
d8ee4a1c LD |
522 | fail: |
523 | if (gpio_is_valid(button->gpio)) | |
524 | gpio_free(button->gpio); | |
525 | ||
bc8f1eaf BD |
526 | return error; |
527 | } | |
528 | ||
173bdd74 S |
529 | static int gpio_keys_open(struct input_dev *input) |
530 | { | |
531 | struct gpio_keys_drvdata *ddata = input_get_drvdata(input); | |
219edc71 | 532 | const struct gpio_keys_platform_data *pdata = ddata->pdata; |
173bdd74 | 533 | |
219edc71 | 534 | return pdata->enable ? pdata->enable(input->dev.parent) : 0; |
173bdd74 S |
535 | } |
536 | ||
537 | static void gpio_keys_close(struct input_dev *input) | |
538 | { | |
539 | struct gpio_keys_drvdata *ddata = input_get_drvdata(input); | |
219edc71 | 540 | const struct gpio_keys_platform_data *pdata = ddata->pdata; |
173bdd74 | 541 | |
219edc71 APS |
542 | if (pdata->disable) |
543 | pdata->disable(input->dev.parent); | |
173bdd74 S |
544 | } |
545 | ||
fd05d089 DJ |
546 | /* |
547 | * Handlers for alternative sources of platform_data | |
548 | */ | |
219edc71 | 549 | |
fd05d089 DJ |
550 | #ifdef CONFIG_OF |
551 | /* | |
552 | * Translate OpenFirmware node properties into platform_data | |
553 | */ | |
219edc71 APS |
554 | static struct gpio_keys_platform_data * __devinit |
555 | gpio_keys_get_devtree_pdata(struct device *dev) | |
fd05d089 DJ |
556 | { |
557 | struct device_node *node, *pp; | |
219edc71 APS |
558 | struct gpio_keys_platform_data *pdata; |
559 | struct gpio_keys_button *button; | |
560 | int error; | |
561 | int nbuttons; | |
fd05d089 | 562 | int i; |
fd05d089 DJ |
563 | |
564 | node = dev->of_node; | |
219edc71 APS |
565 | if (!node) { |
566 | error = -ENODEV; | |
567 | goto err_out; | |
568 | } | |
fd05d089 | 569 | |
219edc71 APS |
570 | nbuttons = of_get_child_count(node); |
571 | if (nbuttons == 0) { | |
572 | error = -ENODEV; | |
573 | goto err_out; | |
574 | } | |
fd05d089 | 575 | |
219edc71 APS |
576 | pdata = kzalloc(sizeof(*pdata) + nbuttons * (sizeof *button), |
577 | GFP_KERNEL); | |
578 | if (!pdata) { | |
579 | error = -ENOMEM; | |
580 | goto err_out; | |
581 | } | |
fd05d089 | 582 | |
219edc71 APS |
583 | pdata->buttons = (struct gpio_keys_button *)(pdata + 1); |
584 | pdata->nbuttons = nbuttons; | |
fd05d089 | 585 | |
219edc71 | 586 | pdata->rep = !!of_get_property(node, "autorepeat", NULL); |
fd05d089 | 587 | |
fd05d089 | 588 | i = 0; |
219edc71 | 589 | for_each_child_of_node(node, pp) { |
fd05d089 DJ |
590 | enum of_gpio_flags flags; |
591 | ||
592 | if (!of_find_property(pp, "gpios", NULL)) { | |
593 | pdata->nbuttons--; | |
594 | dev_warn(dev, "Found button without gpios\n"); | |
595 | continue; | |
596 | } | |
fd05d089 | 597 | |
219edc71 | 598 | button = &pdata->buttons[i++]; |
fd05d089 | 599 | |
219edc71 APS |
600 | button->gpio = of_get_gpio_flags(pp, 0, &flags); |
601 | button->active_low = flags & OF_GPIO_ACTIVE_LOW; | |
fd05d089 | 602 | |
219edc71 APS |
603 | if (of_property_read_u32(pp, "linux,code", &button->code)) { |
604 | dev_err(dev, "Button without keycode: 0x%x\n", | |
605 | button->gpio); | |
606 | error = -EINVAL; | |
607 | goto err_free_pdata; | |
608 | } | |
fd05d089 | 609 | |
219edc71 | 610 | button->desc = of_get_property(pp, "label", NULL); |
fd05d089 | 611 | |
219edc71 APS |
612 | if (of_property_read_u32(pp, "linux,input-type", &button->type)) |
613 | button->type = EV_KEY; | |
614 | ||
615 | button->wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL); | |
fd05d089 | 616 | |
219edc71 APS |
617 | if (of_property_read_u32(pp, "debounce-interval", |
618 | &button->debounce_interval)) | |
619 | button->debounce_interval = 5; | |
fd05d089 DJ |
620 | } |
621 | ||
219edc71 APS |
622 | if (pdata->nbuttons == 0) { |
623 | error = -EINVAL; | |
624 | goto err_free_pdata; | |
625 | } | |
fd05d089 | 626 | |
219edc71 | 627 | return pdata; |
fd05d089 | 628 | |
219edc71 APS |
629 | err_free_pdata: |
630 | kfree(pdata); | |
631 | err_out: | |
632 | return ERR_PTR(error); | |
fd05d089 DJ |
633 | } |
634 | ||
635 | static struct of_device_id gpio_keys_of_match[] = { | |
636 | { .compatible = "gpio-keys", }, | |
637 | { }, | |
638 | }; | |
639 | MODULE_DEVICE_TABLE(of, gpio_keys_of_match); | |
640 | ||
641 | #else | |
642 | ||
219edc71 APS |
643 | static inline struct gpio_keys_platform_data * |
644 | gpio_keys_get_devtree_pdata(struct device *dev) | |
fd05d089 | 645 | { |
219edc71 | 646 | return ERR_PTR(-ENODEV); |
fd05d089 DJ |
647 | } |
648 | ||
fd05d089 DJ |
649 | #endif |
650 | ||
a16ca239 DT |
651 | static void gpio_remove_key(struct gpio_button_data *bdata) |
652 | { | |
d8ee4a1c | 653 | free_irq(bdata->irq, bdata); |
a16ca239 DT |
654 | if (bdata->timer_debounce) |
655 | del_timer_sync(&bdata->timer); | |
656 | cancel_work_sync(&bdata->work); | |
d8ee4a1c LD |
657 | if (gpio_is_valid(bdata->button->gpio)) |
658 | gpio_free(bdata->button->gpio); | |
a16ca239 DT |
659 | } |
660 | ||
78a56aab PB |
661 | static int __devinit gpio_keys_probe(struct platform_device *pdev) |
662 | { | |
db19fd8b | 663 | struct device *dev = &pdev->dev; |
219edc71 APS |
664 | const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev); |
665 | struct gpio_keys_drvdata *ddata; | |
78a56aab PB |
666 | struct input_dev *input; |
667 | int i, error; | |
e15b0213 | 668 | int wakeup = 0; |
78a56aab | 669 | |
fd05d089 | 670 | if (!pdata) { |
219edc71 APS |
671 | pdata = gpio_keys_get_devtree_pdata(dev); |
672 | if (IS_ERR(pdata)) | |
673 | return PTR_ERR(pdata); | |
fd05d089 DJ |
674 | } |
675 | ||
a33466e3 DB |
676 | ddata = kzalloc(sizeof(struct gpio_keys_drvdata) + |
677 | pdata->nbuttons * sizeof(struct gpio_button_data), | |
678 | GFP_KERNEL); | |
78a56aab | 679 | input = input_allocate_device(); |
a33466e3 | 680 | if (!ddata || !input) { |
db19fd8b | 681 | dev_err(dev, "failed to allocate state\n"); |
a33466e3 DB |
682 | error = -ENOMEM; |
683 | goto fail1; | |
684 | } | |
78a56aab | 685 | |
219edc71 | 686 | ddata->pdata = pdata; |
9e3af04f | 687 | ddata->input = input; |
9e3af04f MW |
688 | mutex_init(&ddata->disable_lock); |
689 | ||
a33466e3 | 690 | platform_set_drvdata(pdev, ddata); |
173bdd74 | 691 | input_set_drvdata(input, ddata); |
78a56aab | 692 | |
46711277 | 693 | input->name = pdata->name ? : pdev->name; |
78a56aab | 694 | input->phys = "gpio-keys/input0"; |
469ba4df | 695 | input->dev.parent = &pdev->dev; |
173bdd74 S |
696 | input->open = gpio_keys_open; |
697 | input->close = gpio_keys_close; | |
78a56aab PB |
698 | |
699 | input->id.bustype = BUS_HOST; | |
700 | input->id.vendor = 0x0001; | |
701 | input->id.product = 0x0001; | |
702 | input->id.version = 0x0100; | |
703 | ||
b67b4b11 DC |
704 | /* Enable auto repeat feature of Linux input subsystem */ |
705 | if (pdata->rep) | |
706 | __set_bit(EV_REP, input->evbit); | |
707 | ||
78a56aab | 708 | for (i = 0; i < pdata->nbuttons; i++) { |
d9080921 | 709 | const struct gpio_keys_button *button = &pdata->buttons[i]; |
a33466e3 | 710 | struct gpio_button_data *bdata = &ddata->data[i]; |
78a56aab | 711 | |
d9080921 | 712 | error = gpio_keys_setup_key(pdev, input, bdata, button); |
bc8f1eaf | 713 | if (error) |
a33466e3 | 714 | goto fail2; |
84767d00 | 715 | |
e15b0213 AS |
716 | if (button->wakeup) |
717 | wakeup = 1; | |
78a56aab PB |
718 | } |
719 | ||
9e3af04f | 720 | error = sysfs_create_group(&pdev->dev.kobj, &gpio_keys_attr_group); |
78a56aab | 721 | if (error) { |
9e3af04f MW |
722 | dev_err(dev, "Unable to export keys/switches, error: %d\n", |
723 | error); | |
a33466e3 | 724 | goto fail2; |
78a56aab PB |
725 | } |
726 | ||
9e3af04f MW |
727 | error = input_register_device(input); |
728 | if (error) { | |
729 | dev_err(dev, "Unable to register input device, error: %d\n", | |
730 | error); | |
731 | goto fail3; | |
732 | } | |
733 | ||
d8ee4a1c LD |
734 | /* get current state of buttons that are connected to GPIOs */ |
735 | for (i = 0; i < pdata->nbuttons; i++) { | |
736 | struct gpio_button_data *bdata = &ddata->data[i]; | |
737 | if (gpio_is_valid(bdata->button->gpio)) | |
738 | gpio_keys_gpio_report_event(bdata); | |
739 | } | |
6ee88d71 DM |
740 | input_sync(input); |
741 | ||
e15b0213 AS |
742 | device_init_wakeup(&pdev->dev, wakeup); |
743 | ||
78a56aab PB |
744 | return 0; |
745 | ||
9e3af04f MW |
746 | fail3: |
747 | sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); | |
a33466e3 | 748 | fail2: |
a16ca239 DT |
749 | while (--i >= 0) |
750 | gpio_remove_key(&ddata->data[i]); | |
78a56aab | 751 | |
006df302 | 752 | platform_set_drvdata(pdev, NULL); |
a33466e3 | 753 | fail1: |
78a56aab | 754 | input_free_device(input); |
a33466e3 | 755 | kfree(ddata); |
219edc71 APS |
756 | /* If we have no platform data, we allocated pdata dynamically. */ |
757 | if (!dev_get_platdata(&pdev->dev)) | |
758 | kfree(pdata); | |
78a56aab PB |
759 | |
760 | return error; | |
761 | } | |
762 | ||
763 | static int __devexit gpio_keys_remove(struct platform_device *pdev) | |
764 | { | |
a33466e3 DB |
765 | struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); |
766 | struct input_dev *input = ddata->input; | |
78a56aab PB |
767 | int i; |
768 | ||
9e3af04f MW |
769 | sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); |
770 | ||
e15b0213 AS |
771 | device_init_wakeup(&pdev->dev, 0); |
772 | ||
219edc71 | 773 | for (i = 0; i < ddata->pdata->nbuttons; i++) |
a16ca239 | 774 | gpio_remove_key(&ddata->data[i]); |
78a56aab PB |
775 | |
776 | input_unregister_device(input); | |
fd05d089 | 777 | |
219edc71 APS |
778 | /* If we have no platform data, we allocated pdata dynamically. */ |
779 | if (!dev_get_platdata(&pdev->dev)) | |
780 | kfree(ddata->pdata); | |
fd05d089 | 781 | |
16382079 | 782 | kfree(ddata); |
78a56aab PB |
783 | |
784 | return 0; | |
785 | } | |
786 | ||
bdda8216 | 787 | #ifdef CONFIG_PM_SLEEP |
ae78e0e0 | 788 | static int gpio_keys_suspend(struct device *dev) |
e15b0213 | 789 | { |
fd05d089 | 790 | struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); |
e15b0213 AS |
791 | int i; |
792 | ||
fd05d089 | 793 | if (device_may_wakeup(dev)) { |
219edc71 | 794 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
d8ee4a1c LD |
795 | struct gpio_button_data *bdata = &ddata->data[i]; |
796 | if (bdata->button->wakeup) | |
797 | enable_irq_wake(bdata->irq); | |
e15b0213 AS |
798 | } |
799 | } | |
800 | ||
801 | return 0; | |
802 | } | |
803 | ||
ae78e0e0 | 804 | static int gpio_keys_resume(struct device *dev) |
e15b0213 | 805 | { |
fd05d089 | 806 | struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); |
e15b0213 AS |
807 | int i; |
808 | ||
219edc71 | 809 | for (i = 0; i < ddata->pdata->nbuttons; i++) { |
d8ee4a1c LD |
810 | struct gpio_button_data *bdata = &ddata->data[i]; |
811 | if (bdata->button->wakeup && device_may_wakeup(dev)) | |
812 | disable_irq_wake(bdata->irq); | |
6ee88d71 | 813 | |
d8ee4a1c LD |
814 | if (gpio_is_valid(bdata->button->gpio)) |
815 | gpio_keys_gpio_report_event(bdata); | |
e15b0213 | 816 | } |
6ee88d71 | 817 | input_sync(ddata->input); |
e15b0213 AS |
818 | |
819 | return 0; | |
820 | } | |
e15b0213 AS |
821 | #endif |
822 | ||
bdda8216 DT |
823 | static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume); |
824 | ||
9b07044c | 825 | static struct platform_driver gpio_keys_device_driver = { |
78a56aab | 826 | .probe = gpio_keys_probe, |
1cb0aa88 | 827 | .remove = gpio_keys_remove, |
78a56aab PB |
828 | .driver = { |
829 | .name = "gpio-keys", | |
d7b5247b | 830 | .owner = THIS_MODULE, |
ae78e0e0 | 831 | .pm = &gpio_keys_pm_ops, |
219edc71 | 832 | .of_match_table = of_match_ptr(gpio_keys_of_match), |
78a56aab PB |
833 | } |
834 | }; | |
835 | ||
836 | static int __init gpio_keys_init(void) | |
837 | { | |
838 | return platform_driver_register(&gpio_keys_device_driver); | |
839 | } | |
840 | ||
841 | static void __exit gpio_keys_exit(void) | |
842 | { | |
843 | platform_driver_unregister(&gpio_keys_device_driver); | |
844 | } | |
845 | ||
b2330205 | 846 | late_initcall(gpio_keys_init); |
78a56aab PB |
847 | module_exit(gpio_keys_exit); |
848 | ||
849 | MODULE_LICENSE("GPL"); | |
850 | MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>"); | |
7e2ecdf4 | 851 | MODULE_DESCRIPTION("Keyboard driver for GPIOs"); |
d7b5247b | 852 | MODULE_ALIAS("platform:gpio-keys"); |