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 enum of_gpio_flags flags; 606 607 if (!of_find_property(pp, "gpios", NULL)) { 608 pdata->nbuttons--; 609 dev_warn(dev, "Found button without gpios\n"); 610 continue; 611 } 612 613 button = &pdata->buttons[i++]; 614 615 button->gpio = of_get_gpio_flags(pp, 0, &flags); 616 button->active_low = flags & OF_GPIO_ACTIVE_LOW; 617 618 if (of_property_read_u32(pp, "linux,code", &button->code)) { 619 dev_err(dev, "Button without keycode: 0x%x\n", 620 button->gpio); 621 error = -EINVAL; 622 goto err_free_pdata; 623 } 624 625 button->desc = of_get_property(pp, "label", NULL); 626 627 if (of_property_read_u32(pp, "linux,input-type", &button->type)) 628 button->type = EV_KEY; 629 630 button->wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL); 631 632 if (of_property_read_u32(pp, "debounce-interval", 633 &button->debounce_interval)) 634 button->debounce_interval = 5; 635 } 636 637 if (pdata->nbuttons == 0) { 638 error = -EINVAL; 639 goto err_free_pdata; 640 } 641 642 return pdata; 643 644 err_free_pdata: 645 kfree(pdata); 646 err_out: 647 return ERR_PTR(error); 648 } 649 650 static struct of_device_id gpio_keys_of_match[] = { 651 { .compatible = "gpio-keys", }, 652 { }, 653 }; 654 MODULE_DEVICE_TABLE(of, gpio_keys_of_match); 655 656 #else 657 658 static inline struct gpio_keys_platform_data * 659 gpio_keys_get_devtree_pdata(struct device *dev) 660 { 661 return ERR_PTR(-ENODEV); 662 } 663 664 #endif 665 666 static void gpio_remove_key(struct gpio_button_data *bdata) 667 { 668 free_irq(bdata->irq, bdata); 669 if (bdata->timer_debounce) 670 del_timer_sync(&bdata->timer); 671 cancel_work_sync(&bdata->work); 672 if (gpio_is_valid(bdata->button->gpio)) 673 gpio_free(bdata->button->gpio); 674 } 675 676 static int gpio_keys_probe(struct platform_device *pdev) 677 { 678 struct device *dev = &pdev->dev; 679 const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev); 680 struct gpio_keys_drvdata *ddata; 681 struct input_dev *input; 682 int i, error; 683 int wakeup = 0; 684 685 if (!pdata) { 686 pdata = gpio_keys_get_devtree_pdata(dev); 687 if (IS_ERR(pdata)) 688 return PTR_ERR(pdata); 689 } 690 691 ddata = kzalloc(sizeof(struct gpio_keys_drvdata) + 692 pdata->nbuttons * sizeof(struct gpio_button_data), 693 GFP_KERNEL); 694 input = input_allocate_device(); 695 if (!ddata || !input) { 696 dev_err(dev, "failed to allocate state\n"); 697 error = -ENOMEM; 698 goto fail1; 699 } 700 701 ddata->pdata = pdata; 702 ddata->input = input; 703 mutex_init(&ddata->disable_lock); 704 705 platform_set_drvdata(pdev, ddata); 706 input_set_drvdata(input, ddata); 707 708 input->name = pdata->name ? : pdev->name; 709 input->phys = "gpio-keys/input0"; 710 input->dev.parent = &pdev->dev; 711 input->open = gpio_keys_open; 712 input->close = gpio_keys_close; 713 714 input->id.bustype = BUS_HOST; 715 input->id.vendor = 0x0001; 716 input->id.product = 0x0001; 717 input->id.version = 0x0100; 718 719 /* Enable auto repeat feature of Linux input subsystem */ 720 if (pdata->rep) 721 __set_bit(EV_REP, input->evbit); 722 723 for (i = 0; i < pdata->nbuttons; i++) { 724 const struct gpio_keys_button *button = &pdata->buttons[i]; 725 struct gpio_button_data *bdata = &ddata->data[i]; 726 727 error = gpio_keys_setup_key(pdev, input, bdata, button); 728 if (error) 729 goto fail2; 730 731 if (button->wakeup) 732 wakeup = 1; 733 } 734 735 error = sysfs_create_group(&pdev->dev.kobj, &gpio_keys_attr_group); 736 if (error) { 737 dev_err(dev, "Unable to export keys/switches, error: %d\n", 738 error); 739 goto fail2; 740 } 741 742 error = input_register_device(input); 743 if (error) { 744 dev_err(dev, "Unable to register input device, error: %d\n", 745 error); 746 goto fail3; 747 } 748 749 device_init_wakeup(&pdev->dev, wakeup); 750 751 return 0; 752 753 fail3: 754 sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); 755 fail2: 756 while (--i >= 0) 757 gpio_remove_key(&ddata->data[i]); 758 759 platform_set_drvdata(pdev, NULL); 760 fail1: 761 input_free_device(input); 762 kfree(ddata); 763 /* If we have no platform data, we allocated pdata dynamically. */ 764 if (!dev_get_platdata(&pdev->dev)) 765 kfree(pdata); 766 767 return error; 768 } 769 770 static int gpio_keys_remove(struct platform_device *pdev) 771 { 772 struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); 773 struct input_dev *input = ddata->input; 774 int i; 775 776 sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); 777 778 device_init_wakeup(&pdev->dev, 0); 779 780 for (i = 0; i < ddata->pdata->nbuttons; i++) 781 gpio_remove_key(&ddata->data[i]); 782 783 input_unregister_device(input); 784 785 /* If we have no platform data, we allocated pdata dynamically. */ 786 if (!dev_get_platdata(&pdev->dev)) 787 kfree(ddata->pdata); 788 789 kfree(ddata); 790 791 return 0; 792 } 793 794 #ifdef CONFIG_PM_SLEEP 795 static int gpio_keys_suspend(struct device *dev) 796 { 797 struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); 798 struct input_dev *input = ddata->input; 799 int i; 800 801 if (device_may_wakeup(dev)) { 802 for (i = 0; i < ddata->pdata->nbuttons; i++) { 803 struct gpio_button_data *bdata = &ddata->data[i]; 804 if (bdata->button->wakeup) 805 enable_irq_wake(bdata->irq); 806 } 807 } else { 808 mutex_lock(&input->mutex); 809 if (input->users) 810 gpio_keys_close(input); 811 mutex_unlock(&input->mutex); 812 } 813 814 return 0; 815 } 816 817 static int gpio_keys_resume(struct device *dev) 818 { 819 struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); 820 struct input_dev *input = ddata->input; 821 int error = 0; 822 int i; 823 824 if (device_may_wakeup(dev)) { 825 for (i = 0; i < ddata->pdata->nbuttons; i++) { 826 struct gpio_button_data *bdata = &ddata->data[i]; 827 if (bdata->button->wakeup) 828 disable_irq_wake(bdata->irq); 829 } 830 } else { 831 mutex_lock(&input->mutex); 832 if (input->users) 833 error = gpio_keys_open(input); 834 mutex_unlock(&input->mutex); 835 } 836 837 if (error) 838 return error; 839 840 gpio_keys_report_state(ddata); 841 return 0; 842 } 843 #endif 844 845 static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume); 846 847 static struct platform_driver gpio_keys_device_driver = { 848 .probe = gpio_keys_probe, 849 .remove = gpio_keys_remove, 850 .driver = { 851 .name = "gpio-keys", 852 .owner = THIS_MODULE, 853 .pm = &gpio_keys_pm_ops, 854 .of_match_table = of_match_ptr(gpio_keys_of_match), 855 } 856 }; 857 858 static int __init gpio_keys_init(void) 859 { 860 return platform_driver_register(&gpio_keys_device_driver); 861 } 862 863 static void __exit gpio_keys_exit(void) 864 { 865 platform_driver_unregister(&gpio_keys_device_driver); 866 } 867 868 late_initcall(gpio_keys_init); 869 module_exit(gpio_keys_exit); 870 871 MODULE_LICENSE("GPL"); 872 MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>"); 873 MODULE_DESCRIPTION("Keyboard driver for GPIOs"); 874 MODULE_ALIAS("platform:gpio-keys"); 875