1 /* 2 * Driver for keys on GPIO lines capable of generating interrupts. 3 * 4 * Copyright 2005 Phil Blundell 5 * Copyright 2010, 2011 David Jander <david@protonic.nl> 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> 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> 20 #include <linux/slab.h> 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> 26 #include <linux/gpio_keys.h> 27 #include <linux/workqueue.h> 28 #include <linux/gpio.h> 29 #include <linux/of_platform.h> 30 #include <linux/of_gpio.h> 31 #include <linux/spinlock.h> 32 33 struct gpio_button_data { 34 const struct gpio_keys_button *button; 35 struct input_dev *input; 36 struct timer_list timer; 37 struct work_struct work; 38 unsigned int timer_debounce; /* in msecs */ 39 unsigned int irq; 40 spinlock_t lock; 41 bool disabled; 42 bool key_pressed; 43 }; 44 45 struct gpio_keys_drvdata { 46 const struct gpio_keys_platform_data *pdata; 47 struct input_dev *input; 48 struct mutex disable_lock; 49 struct gpio_button_data data[0]; 50 }; 51 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 */ 119 disable_irq(bdata->irq); 120 if (bdata->timer_debounce) 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) { 140 enable_irq(bdata->irq); 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; 171 172 for (i = 0; i < ddata->pdata->nbuttons; i++) { 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 200 * GPIO buttons accordingly. Returns 0 on success and negative error 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 */ 220 for (i = 0; i < ddata->pdata->nbuttons; i++) { 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); 234 235 for (i = 0; i < ddata->pdata->nbuttons; i++) { 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 }; 324 325 static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata) 326 { 327 const struct gpio_keys_button *button = bdata->button; 328 struct input_dev *input = bdata->input; 329 unsigned int type = button->type ?: EV_KEY; 330 int state = (gpio_get_value_cansleep(button->gpio) ? 1 : 0) ^ button->active_low; 331 332 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 } 338 input_sync(input); 339 } 340 341 static void gpio_keys_gpio_work_func(struct work_struct *work) 342 { 343 struct gpio_button_data *bdata = 344 container_of(work, struct gpio_button_data, work); 345 346 gpio_keys_gpio_report_event(bdata); 347 348 if (bdata->button->wakeup) 349 pm_relax(bdata->input->dev.parent); 350 } 351 352 static void gpio_keys_gpio_timer(unsigned long _data) 353 { 354 struct gpio_button_data *bdata = (struct gpio_button_data *)_data; 355 356 schedule_work(&bdata->work); 357 } 358 359 static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id) 360 { 361 struct gpio_button_data *bdata = dev_id; 362 363 BUG_ON(irq != bdata->irq); 364 365 if (bdata->button->wakeup) 366 pm_stay_awake(bdata->input->dev.parent); 367 if (bdata->timer_debounce) 368 mod_timer(&bdata->timer, 369 jiffies + msecs_to_jiffies(bdata->timer_debounce)); 370 else 371 schedule_work(&bdata->work); 372 373 return IRQ_HANDLED; 374 } 375 376 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) { 403 if (bdata->button->wakeup) 404 pm_wakeup_event(bdata->input->dev.parent, 0); 405 406 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 } 425 426 static int gpio_keys_setup_key(struct platform_device *pdev, 427 struct input_dev *input, 428 struct gpio_button_data *bdata, 429 const struct gpio_keys_button *button) 430 { 431 const char *desc = button->desc ? button->desc : "gpio_keys"; 432 struct device *dev = &pdev->dev; 433 irq_handler_t isr; 434 unsigned long irqflags; 435 int irq, error; 436 437 bdata->input = input; 438 bdata->button = button; 439 spin_lock_init(&bdata->lock); 440 441 if (gpio_is_valid(button->gpio)) { 442 443 error = gpio_request_one(button->gpio, GPIOF_IN, 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 } 449 450 if (button->debounce_interval) { 451 error = gpio_set_debounce(button->gpio, 452 button->debounce_interval * 1000); 453 /* use timer if gpiolib doesn't provide debounce */ 454 if (error < 0) 455 bdata->timer_debounce = 456 button->debounce_interval; 457 } 458 459 irq = gpio_to_irq(button->gpio); 460 if (irq < 0) { 461 error = irq; 462 dev_err(dev, 463 "Unable to get irq number for GPIO %d, error %d\n", 464 button->gpio, error); 465 goto fail; 466 } 467 bdata->irq = irq; 468 469 INIT_WORK(&bdata->work, gpio_keys_gpio_work_func); 470 setup_timer(&bdata->timer, 471 gpio_keys_gpio_timer, (unsigned long)bdata); 472 473 isr = gpio_keys_gpio_isr; 474 irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING; 475 476 } else { 477 if (!button->irq) { 478 dev_err(dev, "No IRQ specified\n"); 479 return -EINVAL; 480 } 481 bdata->irq = button->irq; 482 483 if (button->type && button->type != EV_KEY) { 484 dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n"); 485 return -EINVAL; 486 } 487 488 bdata->timer_debounce = button->debounce_interval; 489 setup_timer(&bdata->timer, 490 gpio_keys_irq_timer, (unsigned long)bdata); 491 492 isr = gpio_keys_irq_isr; 493 irqflags = 0; 494 } 495 496 input_set_capability(input, button->type ?: EV_KEY, button->code); 497 498 /* 499 * If platform has specified that the button can be disabled, 500 * we don't want it to share the interrupt line. 501 */ 502 if (!button->can_disable) 503 irqflags |= IRQF_SHARED; 504 505 error = request_any_context_irq(bdata->irq, isr, irqflags, desc, bdata); 506 if (error < 0) { 507 dev_err(dev, "Unable to claim irq %d; error %d\n", 508 bdata->irq, error); 509 goto fail; 510 } 511 512 return 0; 513 514 fail: 515 if (gpio_is_valid(button->gpio)) 516 gpio_free(button->gpio); 517 518 return error; 519 } 520 521 static void gpio_keys_report_state(struct gpio_keys_drvdata *ddata) 522 { 523 struct input_dev *input = ddata->input; 524 int i; 525 526 for (i = 0; i < ddata->pdata->nbuttons; i++) { 527 struct gpio_button_data *bdata = &ddata->data[i]; 528 if (gpio_is_valid(bdata->button->gpio)) 529 gpio_keys_gpio_report_event(bdata); 530 } 531 input_sync(input); 532 } 533 534 static int gpio_keys_open(struct input_dev *input) 535 { 536 struct gpio_keys_drvdata *ddata = input_get_drvdata(input); 537 const struct gpio_keys_platform_data *pdata = ddata->pdata; 538 int error; 539 540 if (pdata->enable) { 541 error = pdata->enable(input->dev.parent); 542 if (error) 543 return error; 544 } 545 546 /* Report current state of buttons that are connected to GPIOs */ 547 gpio_keys_report_state(ddata); 548 549 return 0; 550 } 551 552 static void gpio_keys_close(struct input_dev *input) 553 { 554 struct gpio_keys_drvdata *ddata = input_get_drvdata(input); 555 const struct gpio_keys_platform_data *pdata = ddata->pdata; 556 557 if (pdata->disable) 558 pdata->disable(input->dev.parent); 559 } 560 561 /* 562 * Handlers for alternative sources of platform_data 563 */ 564 565 #ifdef CONFIG_OF 566 /* 567 * Translate OpenFirmware node properties into platform_data 568 */ 569 static struct gpio_keys_platform_data * 570 gpio_keys_get_devtree_pdata(struct device *dev) 571 { 572 struct device_node *node, *pp; 573 struct gpio_keys_platform_data *pdata; 574 struct gpio_keys_button *button; 575 int error; 576 int nbuttons; 577 int i; 578 579 node = dev->of_node; 580 if (!node) { 581 error = -ENODEV; 582 goto err_out; 583 } 584 585 nbuttons = of_get_child_count(node); 586 if (nbuttons == 0) { 587 error = -ENODEV; 588 goto err_out; 589 } 590 591 pdata = kzalloc(sizeof(*pdata) + nbuttons * (sizeof *button), 592 GFP_KERNEL); 593 if (!pdata) { 594 error = -ENOMEM; 595 goto err_out; 596 } 597 598 pdata->buttons = (struct gpio_keys_button *)(pdata + 1); 599 pdata->nbuttons = nbuttons; 600 601 pdata->rep = !!of_get_property(node, "autorepeat", NULL); 602 603 i = 0; 604 for_each_child_of_node(node, pp) { 605 int gpio; 606 enum of_gpio_flags flags; 607 608 if (!of_find_property(pp, "gpios", NULL)) { 609 pdata->nbuttons--; 610 dev_warn(dev, "Found button without gpios\n"); 611 continue; 612 } 613 614 gpio = of_get_gpio_flags(pp, 0, &flags); 615 if (gpio < 0) { 616 error = gpio; 617 if (error != -EPROBE_DEFER) 618 dev_err(dev, 619 "Failed to get gpio flags, error: %d\n", 620 error); 621 goto err_free_pdata; 622 } 623 624 button = &pdata->buttons[i++]; 625 626 button->gpio = gpio; 627 button->active_low = flags & OF_GPIO_ACTIVE_LOW; 628 629 if (of_property_read_u32(pp, "linux,code", &button->code)) { 630 dev_err(dev, "Button without keycode: 0x%x\n", 631 button->gpio); 632 error = -EINVAL; 633 goto err_free_pdata; 634 } 635 636 button->desc = of_get_property(pp, "label", NULL); 637 638 if (of_property_read_u32(pp, "linux,input-type", &button->type)) 639 button->type = EV_KEY; 640 641 button->wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL); 642 643 if (of_property_read_u32(pp, "debounce-interval", 644 &button->debounce_interval)) 645 button->debounce_interval = 5; 646 } 647 648 if (pdata->nbuttons == 0) { 649 error = -EINVAL; 650 goto err_free_pdata; 651 } 652 653 return pdata; 654 655 err_free_pdata: 656 kfree(pdata); 657 err_out: 658 return ERR_PTR(error); 659 } 660 661 static struct of_device_id gpio_keys_of_match[] = { 662 { .compatible = "gpio-keys", }, 663 { }, 664 }; 665 MODULE_DEVICE_TABLE(of, gpio_keys_of_match); 666 667 #else 668 669 static inline struct gpio_keys_platform_data * 670 gpio_keys_get_devtree_pdata(struct device *dev) 671 { 672 return ERR_PTR(-ENODEV); 673 } 674 675 #endif 676 677 static void gpio_remove_key(struct gpio_button_data *bdata) 678 { 679 free_irq(bdata->irq, bdata); 680 if (bdata->timer_debounce) 681 del_timer_sync(&bdata->timer); 682 cancel_work_sync(&bdata->work); 683 if (gpio_is_valid(bdata->button->gpio)) 684 gpio_free(bdata->button->gpio); 685 } 686 687 static int gpio_keys_probe(struct platform_device *pdev) 688 { 689 struct device *dev = &pdev->dev; 690 const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev); 691 struct gpio_keys_drvdata *ddata; 692 struct input_dev *input; 693 int i, error; 694 int wakeup = 0; 695 696 if (!pdata) { 697 pdata = gpio_keys_get_devtree_pdata(dev); 698 if (IS_ERR(pdata)) 699 return PTR_ERR(pdata); 700 } 701 702 ddata = kzalloc(sizeof(struct gpio_keys_drvdata) + 703 pdata->nbuttons * sizeof(struct gpio_button_data), 704 GFP_KERNEL); 705 input = input_allocate_device(); 706 if (!ddata || !input) { 707 dev_err(dev, "failed to allocate state\n"); 708 error = -ENOMEM; 709 goto fail1; 710 } 711 712 ddata->pdata = pdata; 713 ddata->input = input; 714 mutex_init(&ddata->disable_lock); 715 716 platform_set_drvdata(pdev, ddata); 717 input_set_drvdata(input, ddata); 718 719 input->name = pdata->name ? : pdev->name; 720 input->phys = "gpio-keys/input0"; 721 input->dev.parent = &pdev->dev; 722 input->open = gpio_keys_open; 723 input->close = gpio_keys_close; 724 725 input->id.bustype = BUS_HOST; 726 input->id.vendor = 0x0001; 727 input->id.product = 0x0001; 728 input->id.version = 0x0100; 729 730 /* Enable auto repeat feature of Linux input subsystem */ 731 if (pdata->rep) 732 __set_bit(EV_REP, input->evbit); 733 734 for (i = 0; i < pdata->nbuttons; i++) { 735 const struct gpio_keys_button *button = &pdata->buttons[i]; 736 struct gpio_button_data *bdata = &ddata->data[i]; 737 738 error = gpio_keys_setup_key(pdev, input, bdata, button); 739 if (error) 740 goto fail2; 741 742 if (button->wakeup) 743 wakeup = 1; 744 } 745 746 error = sysfs_create_group(&pdev->dev.kobj, &gpio_keys_attr_group); 747 if (error) { 748 dev_err(dev, "Unable to export keys/switches, error: %d\n", 749 error); 750 goto fail2; 751 } 752 753 error = input_register_device(input); 754 if (error) { 755 dev_err(dev, "Unable to register input device, error: %d\n", 756 error); 757 goto fail3; 758 } 759 760 device_init_wakeup(&pdev->dev, wakeup); 761 762 return 0; 763 764 fail3: 765 sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); 766 fail2: 767 while (--i >= 0) 768 gpio_remove_key(&ddata->data[i]); 769 770 platform_set_drvdata(pdev, NULL); 771 fail1: 772 input_free_device(input); 773 kfree(ddata); 774 /* If we have no platform data, we allocated pdata dynamically. */ 775 if (!dev_get_platdata(&pdev->dev)) 776 kfree(pdata); 777 778 return error; 779 } 780 781 static int gpio_keys_remove(struct platform_device *pdev) 782 { 783 struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); 784 struct input_dev *input = ddata->input; 785 int i; 786 787 sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); 788 789 device_init_wakeup(&pdev->dev, 0); 790 791 for (i = 0; i < ddata->pdata->nbuttons; i++) 792 gpio_remove_key(&ddata->data[i]); 793 794 input_unregister_device(input); 795 796 /* If we have no platform data, we allocated pdata dynamically. */ 797 if (!dev_get_platdata(&pdev->dev)) 798 kfree(ddata->pdata); 799 800 kfree(ddata); 801 802 return 0; 803 } 804 805 #ifdef CONFIG_PM_SLEEP 806 static int gpio_keys_suspend(struct device *dev) 807 { 808 struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); 809 struct input_dev *input = ddata->input; 810 int i; 811 812 if (device_may_wakeup(dev)) { 813 for (i = 0; i < ddata->pdata->nbuttons; i++) { 814 struct gpio_button_data *bdata = &ddata->data[i]; 815 if (bdata->button->wakeup) 816 enable_irq_wake(bdata->irq); 817 } 818 } else { 819 mutex_lock(&input->mutex); 820 if (input->users) 821 gpio_keys_close(input); 822 mutex_unlock(&input->mutex); 823 } 824 825 return 0; 826 } 827 828 static int gpio_keys_resume(struct device *dev) 829 { 830 struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); 831 struct input_dev *input = ddata->input; 832 int error = 0; 833 int i; 834 835 if (device_may_wakeup(dev)) { 836 for (i = 0; i < ddata->pdata->nbuttons; i++) { 837 struct gpio_button_data *bdata = &ddata->data[i]; 838 if (bdata->button->wakeup) 839 disable_irq_wake(bdata->irq); 840 } 841 } else { 842 mutex_lock(&input->mutex); 843 if (input->users) 844 error = gpio_keys_open(input); 845 mutex_unlock(&input->mutex); 846 } 847 848 if (error) 849 return error; 850 851 gpio_keys_report_state(ddata); 852 return 0; 853 } 854 #endif 855 856 static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume); 857 858 static struct platform_driver gpio_keys_device_driver = { 859 .probe = gpio_keys_probe, 860 .remove = gpio_keys_remove, 861 .driver = { 862 .name = "gpio-keys", 863 .owner = THIS_MODULE, 864 .pm = &gpio_keys_pm_ops, 865 .of_match_table = of_match_ptr(gpio_keys_of_match), 866 } 867 }; 868 869 static int __init gpio_keys_init(void) 870 { 871 return platform_driver_register(&gpio_keys_device_driver); 872 } 873 874 static void __exit gpio_keys_exit(void) 875 { 876 platform_driver_unregister(&gpio_keys_device_driver); 877 } 878 879 late_initcall(gpio_keys_init); 880 module_exit(gpio_keys_exit); 881 882 MODULE_LICENSE("GPL"); 883 MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>"); 884 MODULE_DESCRIPTION("Keyboard driver for GPIOs"); 885 MODULE_ALIAS("platform:gpio-keys"); 886