diff options
Diffstat (limited to 'drivers/input/keyboard/gpio_keys.c')
| -rw-r--r-- | drivers/input/keyboard/gpio_keys.c | 864 |
1 files changed, 864 insertions, 0 deletions
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c new file mode 100644 index 000000000..ddf4045de --- /dev/null +++ b/drivers/input/keyboard/gpio_keys.c @@ -0,0 +1,864 @@ +/* + * Driver for keys on GPIO lines capable of generating interrupts. + * + * Copyright 2005 Phil Blundell + * Copyright 2010, 2011 David Jander <david@protonic.nl> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> + +#include <linux/init.h> +#include <linux/fs.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/sched.h> +#include <linux/pm.h> +#include <linux/slab.h> +#include <linux/sysctl.h> +#include <linux/proc_fs.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/input.h> +#include <linux/gpio_keys.h> +#include <linux/workqueue.h> +#include <linux/gpio.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/of_gpio.h> +#include <linux/of_irq.h> +#include <linux/spinlock.h> + +struct gpio_button_data { + const struct gpio_keys_button *button; + struct input_dev *input; + + struct timer_list release_timer; + unsigned int release_delay; /* in msecs, for IRQ-only buttons */ + + struct delayed_work work; + unsigned int software_debounce; /* in msecs, for GPIO-driven buttons */ + + unsigned int irq; + spinlock_t lock; + bool disabled; + bool key_pressed; +}; + +struct gpio_keys_drvdata { + const struct gpio_keys_platform_data *pdata; + struct input_dev *input; + struct mutex disable_lock; + struct gpio_button_data data[0]; +}; + +/* + * SYSFS interface for enabling/disabling keys and switches: + * + * There are 4 attributes under /sys/devices/platform/gpio-keys/ + * keys [ro] - bitmap of keys (EV_KEY) which can be + * disabled + * switches [ro] - bitmap of switches (EV_SW) which can be + * disabled + * disabled_keys [rw] - bitmap of keys currently disabled + * disabled_switches [rw] - bitmap of switches currently disabled + * + * Userland can change these values and hence disable event generation + * for each key (or switch). Disabling a key means its interrupt line + * is disabled. + * + * For example, if we have following switches set up as gpio-keys: + * SW_DOCK = 5 + * SW_CAMERA_LENS_COVER = 9 + * SW_KEYPAD_SLIDE = 10 + * SW_FRONT_PROXIMITY = 11 + * This is read from switches: + * 11-9,5 + * Next we want to disable proximity (11) and dock (5), we write: + * 11,5 + * to file disabled_switches. Now proximity and dock IRQs are disabled. + * This can be verified by reading the file disabled_switches: + * 11,5 + * If we now want to enable proximity (11) switch we write: + * 5 + * to disabled_switches. + * + * We can disable only those keys which don't allow sharing the irq. + */ + +/** + * get_n_events_by_type() - returns maximum number of events per @type + * @type: type of button (%EV_KEY, %EV_SW) + * + * Return value of this function can be used to allocate bitmap + * large enough to hold all bits for given type. + */ +static inline int get_n_events_by_type(int type) +{ + BUG_ON(type != EV_SW && type != EV_KEY); + + return (type == EV_KEY) ? KEY_CNT : SW_CNT; +} + +/** + * gpio_keys_disable_button() - disables given GPIO button + * @bdata: button data for button to be disabled + * + * Disables button pointed by @bdata. This is done by masking + * IRQ line. After this function is called, button won't generate + * input events anymore. Note that one can only disable buttons + * that don't share IRQs. + * + * Make sure that @bdata->disable_lock is locked when entering + * this function to avoid races when concurrent threads are + * disabling buttons at the same time. + */ +static void gpio_keys_disable_button(struct gpio_button_data *bdata) +{ + if (!bdata->disabled) { + /* + * Disable IRQ and associated timer/work structure. + */ + disable_irq(bdata->irq); + + if (gpio_is_valid(bdata->button->gpio)) + cancel_delayed_work_sync(&bdata->work); + else + del_timer_sync(&bdata->release_timer); + + bdata->disabled = true; + } +} + +/** + * gpio_keys_enable_button() - enables given GPIO button + * @bdata: button data for button to be disabled + * + * Enables given button pointed by @bdata. + * + * Make sure that @bdata->disable_lock is locked when entering + * this function to avoid races with concurrent threads trying + * to enable the same button at the same time. + */ +static void gpio_keys_enable_button(struct gpio_button_data *bdata) +{ + if (bdata->disabled) { + enable_irq(bdata->irq); + bdata->disabled = false; + } +} + +/** + * gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons + * @ddata: pointer to drvdata + * @buf: buffer where stringified bitmap is written + * @type: button type (%EV_KEY, %EV_SW) + * @only_disabled: does caller want only those buttons that are + * currently disabled or all buttons that can be + * disabled + * + * This function writes buttons that can be disabled to @buf. If + * @only_disabled is true, then @buf contains only those buttons + * that are currently disabled. Returns 0 on success or negative + * errno on failure. + */ +static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata, + char *buf, unsigned int type, + bool only_disabled) +{ + int n_events = get_n_events_by_type(type); + unsigned long *bits; + ssize_t ret; + int i; + + bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); + if (!bits) + return -ENOMEM; + + for (i = 0; i < ddata->pdata->nbuttons; i++) { + struct gpio_button_data *bdata = &ddata->data[i]; + + if (bdata->button->type != type) + continue; + + if (only_disabled && !bdata->disabled) + continue; + + __set_bit(bdata->button->code, bits); + } + + ret = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", n_events, bits); + buf[ret++] = '\n'; + buf[ret] = '\0'; + + kfree(bits); + + return ret; +} + +/** + * gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap + * @ddata: pointer to drvdata + * @buf: buffer from userspace that contains stringified bitmap + * @type: button type (%EV_KEY, %EV_SW) + * + * This function parses stringified bitmap from @buf and disables/enables + * GPIO buttons accordingly. Returns 0 on success and negative error + * on failure. + */ +static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata, + const char *buf, unsigned int type) +{ + int n_events = get_n_events_by_type(type); + unsigned long *bits; + ssize_t error; + int i; + + bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); + if (!bits) + return -ENOMEM; + + error = bitmap_parselist(buf, bits, n_events); + if (error) + goto out; + + /* First validate */ + for (i = 0; i < ddata->pdata->nbuttons; i++) { + struct gpio_button_data *bdata = &ddata->data[i]; + + if (bdata->button->type != type) + continue; + + if (test_bit(bdata->button->code, bits) && + !bdata->button->can_disable) { + error = -EINVAL; + goto out; + } + } + + mutex_lock(&ddata->disable_lock); + + for (i = 0; i < ddata->pdata->nbuttons; i++) { + struct gpio_button_data *bdata = &ddata->data[i]; + + if (bdata->button->type != type) + continue; + + if (test_bit(bdata->button->code, bits)) + gpio_keys_disable_button(bdata); + else + gpio_keys_enable_button(bdata); + } + + mutex_unlock(&ddata->disable_lock); + +out: + kfree(bits); + return error; +} + +#define ATTR_SHOW_FN(name, type, only_disabled) \ +static ssize_t gpio_keys_show_##name(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + struct platform_device *pdev = to_platform_device(dev); \ + struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ + \ + return gpio_keys_attr_show_helper(ddata, buf, \ + type, only_disabled); \ +} + +ATTR_SHOW_FN(keys, EV_KEY, false); +ATTR_SHOW_FN(switches, EV_SW, false); +ATTR_SHOW_FN(disabled_keys, EV_KEY, true); +ATTR_SHOW_FN(disabled_switches, EV_SW, true); + +/* + * ATTRIBUTES: + * + * /sys/devices/platform/gpio-keys/keys [ro] + * /sys/devices/platform/gpio-keys/switches [ro] + */ +static DEVICE_ATTR(keys, S_IRUGO, gpio_keys_show_keys, NULL); +static DEVICE_ATTR(switches, S_IRUGO, gpio_keys_show_switches, NULL); + +#define ATTR_STORE_FN(name, type) \ +static ssize_t gpio_keys_store_##name(struct device *dev, \ + struct device_attribute *attr, \ + const char *buf, \ + size_t count) \ +{ \ + struct platform_device *pdev = to_platform_device(dev); \ + struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev); \ + ssize_t error; \ + \ + error = gpio_keys_attr_store_helper(ddata, buf, type); \ + if (error) \ + return error; \ + \ + return count; \ +} + +ATTR_STORE_FN(disabled_keys, EV_KEY); +ATTR_STORE_FN(disabled_switches, EV_SW); + +/* + * ATTRIBUTES: + * + * /sys/devices/platform/gpio-keys/disabled_keys [rw] + * /sys/devices/platform/gpio-keys/disables_switches [rw] + */ +static DEVICE_ATTR(disabled_keys, S_IWUSR | S_IRUGO, + gpio_keys_show_disabled_keys, + gpio_keys_store_disabled_keys); +static DEVICE_ATTR(disabled_switches, S_IWUSR | S_IRUGO, + gpio_keys_show_disabled_switches, + gpio_keys_store_disabled_switches); + +static struct attribute *gpio_keys_attrs[] = { + &dev_attr_keys.attr, + &dev_attr_switches.attr, + &dev_attr_disabled_keys.attr, + &dev_attr_disabled_switches.attr, + NULL, +}; + +static struct attribute_group gpio_keys_attr_group = { + .attrs = gpio_keys_attrs, +}; + +static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata) +{ + const struct gpio_keys_button *button = bdata->button; + struct input_dev *input = bdata->input; + unsigned int type = button->type ?: EV_KEY; + int state = (gpio_get_value_cansleep(button->gpio) ? 1 : 0) ^ button->active_low; + + if (type == EV_ABS) { + if (state) + input_event(input, type, button->code, button->value); + } else { + input_event(input, type, button->code, !!state); + } + input_sync(input); +} + +static void gpio_keys_gpio_work_func(struct work_struct *work) +{ + struct gpio_button_data *bdata = + container_of(work, struct gpio_button_data, work.work); + + gpio_keys_gpio_report_event(bdata); + + if (bdata->button->wakeup) + pm_relax(bdata->input->dev.parent); +} + +static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id) +{ + struct gpio_button_data *bdata = dev_id; + + BUG_ON(irq != bdata->irq); + + if (bdata->button->wakeup) + pm_stay_awake(bdata->input->dev.parent); + + mod_delayed_work(system_wq, + &bdata->work, + msecs_to_jiffies(bdata->software_debounce)); + + return IRQ_HANDLED; +} + +static void gpio_keys_irq_timer(unsigned long _data) +{ + struct gpio_button_data *bdata = (struct gpio_button_data *)_data; + struct input_dev *input = bdata->input; + unsigned long flags; + + spin_lock_irqsave(&bdata->lock, flags); + if (bdata->key_pressed) { + input_event(input, EV_KEY, bdata->button->code, 0); + input_sync(input); + bdata->key_pressed = false; + } + spin_unlock_irqrestore(&bdata->lock, flags); +} + +static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id) +{ + struct gpio_button_data *bdata = dev_id; + const struct gpio_keys_button *button = bdata->button; + struct input_dev *input = bdata->input; + unsigned long flags; + + BUG_ON(irq != bdata->irq); + + spin_lock_irqsave(&bdata->lock, flags); + + if (!bdata->key_pressed) { + if (bdata->button->wakeup) + pm_wakeup_event(bdata->input->dev.parent, 0); + + input_event(input, EV_KEY, button->code, 1); + input_sync(input); + + if (!bdata->release_delay) { + input_event(input, EV_KEY, button->code, 0); + input_sync(input); + goto out; + } + + bdata->key_pressed = true; + } + + if (bdata->release_delay) + mod_timer(&bdata->release_timer, + jiffies + msecs_to_jiffies(bdata->release_delay)); +out: + spin_unlock_irqrestore(&bdata->lock, flags); + return IRQ_HANDLED; +} + +static void gpio_keys_quiesce_key(void *data) +{ + struct gpio_button_data *bdata = data; + + if (gpio_is_valid(bdata->button->gpio)) + cancel_delayed_work_sync(&bdata->work); + else + del_timer_sync(&bdata->release_timer); +} + +static int gpio_keys_setup_key(struct platform_device *pdev, + struct input_dev *input, + struct gpio_button_data *bdata, + const struct gpio_keys_button *button) +{ + const char *desc = button->desc ? button->desc : "gpio_keys"; + struct device *dev = &pdev->dev; + irq_handler_t isr; + unsigned long irqflags; + int irq; + int error; + + bdata->input = input; + bdata->button = button; + spin_lock_init(&bdata->lock); + + if (gpio_is_valid(button->gpio)) { + + error = devm_gpio_request_one(&pdev->dev, button->gpio, + GPIOF_IN, desc); + if (error < 0) { + dev_err(dev, "Failed to request GPIO %d, error %d\n", + button->gpio, error); + return error; + } + + if (button->debounce_interval) { + error = gpio_set_debounce(button->gpio, + button->debounce_interval * 1000); + /* use timer if gpiolib doesn't provide debounce */ + if (error < 0) + bdata->software_debounce = + button->debounce_interval; + } + + if (button->irq) { + bdata->irq = button->irq; + } else { + irq = gpio_to_irq(button->gpio); + if (irq < 0) { + error = irq; + dev_err(dev, + "Unable to get irq number for GPIO %d, error %d\n", + button->gpio, error); + return error; + } + bdata->irq = irq; + } + + INIT_DELAYED_WORK(&bdata->work, gpio_keys_gpio_work_func); + + isr = gpio_keys_gpio_isr; + irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING; + + } else { + if (!button->irq) { + dev_err(dev, "No IRQ specified\n"); + return -EINVAL; + } + bdata->irq = button->irq; + + if (button->type && button->type != EV_KEY) { + dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n"); + return -EINVAL; + } + + bdata->release_delay = button->debounce_interval; + setup_timer(&bdata->release_timer, + gpio_keys_irq_timer, (unsigned long)bdata); + + isr = gpio_keys_irq_isr; + irqflags = 0; + } + + input_set_capability(input, button->type ?: EV_KEY, button->code); + + /* + * Install custom action to cancel release timer and + * workqueue item. + */ + error = devm_add_action(&pdev->dev, gpio_keys_quiesce_key, bdata); + if (error) { + dev_err(&pdev->dev, + "failed to register quiesce action, error: %d\n", + error); + return error; + } + + /* + * If platform has specified that the button can be disabled, + * we don't want it to share the interrupt line. + */ + if (!button->can_disable) + irqflags |= IRQF_SHARED; + + error = devm_request_any_context_irq(&pdev->dev, bdata->irq, + isr, irqflags, desc, bdata); + if (error < 0) { + dev_err(dev, "Unable to claim irq %d; error %d\n", + bdata->irq, error); + return error; + } + + return 0; +} + +static void gpio_keys_report_state(struct gpio_keys_drvdata *ddata) +{ + struct input_dev *input = ddata->input; + int i; + + for (i = 0; i < ddata->pdata->nbuttons; i++) { + struct gpio_button_data *bdata = &ddata->data[i]; + if (gpio_is_valid(bdata->button->gpio)) + gpio_keys_gpio_report_event(bdata); + } + input_sync(input); +} + +static int gpio_keys_open(struct input_dev *input) +{ + struct gpio_keys_drvdata *ddata = input_get_drvdata(input); + const struct gpio_keys_platform_data *pdata = ddata->pdata; + int error; + + if (pdata->enable) { + error = pdata->enable(input->dev.parent); + if (error) + return error; + } + + /* Report current state of buttons that are connected to GPIOs */ + gpio_keys_report_state(ddata); + + return 0; +} + +static void gpio_keys_close(struct input_dev *input) +{ + struct gpio_keys_drvdata *ddata = input_get_drvdata(input); + const struct gpio_keys_platform_data *pdata = ddata->pdata; + + if (pdata->disable) + pdata->disable(input->dev.parent); +} + +/* + * Handlers for alternative sources of platform_data + */ + +#ifdef CONFIG_OF +/* + * Translate OpenFirmware node properties into platform_data + */ +static struct gpio_keys_platform_data * +gpio_keys_get_devtree_pdata(struct device *dev) +{ + struct device_node *node, *pp; + struct gpio_keys_platform_data *pdata; + struct gpio_keys_button *button; + int error; + int nbuttons; + int i; + + node = dev->of_node; + if (!node) + return ERR_PTR(-ENODEV); + + nbuttons = of_get_child_count(node); + if (nbuttons == 0) + return ERR_PTR(-ENODEV); + + pdata = devm_kzalloc(dev, + sizeof(*pdata) + nbuttons * sizeof(*button), + GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + + pdata->buttons = (struct gpio_keys_button *)(pdata + 1); + pdata->nbuttons = nbuttons; + + pdata->rep = !!of_get_property(node, "autorepeat", NULL); + + i = 0; + for_each_child_of_node(node, pp) { + enum of_gpio_flags flags; + + button = &pdata->buttons[i++]; + + button->gpio = of_get_gpio_flags(pp, 0, &flags); + if (button->gpio < 0) { + error = button->gpio; + if (error != -ENOENT) { + if (error != -EPROBE_DEFER) + dev_err(dev, + "Failed to get gpio flags, error: %d\n", + error); + return ERR_PTR(error); + } + } else { + button->active_low = flags & OF_GPIO_ACTIVE_LOW; + } + + button->irq = irq_of_parse_and_map(pp, 0); + + if (!gpio_is_valid(button->gpio) && !button->irq) { + dev_err(dev, "Found button without gpios or irqs\n"); + return ERR_PTR(-EINVAL); + } + + if (of_property_read_u32(pp, "linux,code", &button->code)) { + dev_err(dev, "Button without keycode: 0x%x\n", + button->gpio); + return ERR_PTR(-EINVAL); + } + + button->desc = of_get_property(pp, "label", NULL); + + if (of_property_read_u32(pp, "linux,input-type", &button->type)) + button->type = EV_KEY; + + button->wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL); + + button->can_disable = !!of_get_property(pp, "linux,can-disable", NULL); + + if (of_property_read_u32(pp, "debounce-interval", + &button->debounce_interval)) + button->debounce_interval = 5; + } + + if (pdata->nbuttons == 0) + return ERR_PTR(-EINVAL); + + return pdata; +} + +static const struct of_device_id gpio_keys_of_match[] = { + { .compatible = "gpio-keys", }, + { }, +}; +MODULE_DEVICE_TABLE(of, gpio_keys_of_match); + +#else + +static inline struct gpio_keys_platform_data * +gpio_keys_get_devtree_pdata(struct device *dev) +{ + return ERR_PTR(-ENODEV); +} + +#endif + +static int gpio_keys_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + const struct gpio_keys_platform_data *pdata = dev_get_platdata(dev); + struct gpio_keys_drvdata *ddata; + struct input_dev *input; + size_t size; + int i, error; + int wakeup = 0; + + if (!pdata) { + pdata = gpio_keys_get_devtree_pdata(dev); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + } + + size = sizeof(struct gpio_keys_drvdata) + + pdata->nbuttons * sizeof(struct gpio_button_data); + ddata = devm_kzalloc(dev, size, GFP_KERNEL); + if (!ddata) { + dev_err(dev, "failed to allocate state\n"); + return -ENOMEM; + } + + input = devm_input_allocate_device(dev); + if (!input) { + dev_err(dev, "failed to allocate input device\n"); + return -ENOMEM; + } + + ddata->pdata = pdata; + ddata->input = input; + mutex_init(&ddata->disable_lock); + + platform_set_drvdata(pdev, ddata); + input_set_drvdata(input, ddata); + + input->name = pdata->name ? : pdev->name; + input->phys = "gpio-keys/input0"; + input->dev.parent = &pdev->dev; + input->open = gpio_keys_open; + input->close = gpio_keys_close; + + input->id.bustype = BUS_HOST; + input->id.vendor = 0x0001; + input->id.product = 0x0001; + input->id.version = 0x0100; + + /* Enable auto repeat feature of Linux input subsystem */ + if (pdata->rep) + __set_bit(EV_REP, input->evbit); + + for (i = 0; i < pdata->nbuttons; i++) { + const struct gpio_keys_button *button = &pdata->buttons[i]; + struct gpio_button_data *bdata = &ddata->data[i]; + + error = gpio_keys_setup_key(pdev, input, bdata, button); + if (error) + return error; + + if (button->wakeup) + wakeup = 1; + } + + error = sysfs_create_group(&pdev->dev.kobj, &gpio_keys_attr_group); + if (error) { + dev_err(dev, "Unable to export keys/switches, error: %d\n", + error); + return error; + } + + error = input_register_device(input); + if (error) { + dev_err(dev, "Unable to register input device, error: %d\n", + error); + goto err_remove_group; + } + + device_init_wakeup(&pdev->dev, wakeup); + + return 0; + +err_remove_group: + sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); + return error; +} + +static int gpio_keys_remove(struct platform_device *pdev) +{ + sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group); + + device_init_wakeup(&pdev->dev, 0); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int gpio_keys_suspend(struct device *dev) +{ + struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); + struct input_dev *input = ddata->input; + int i; + + if (device_may_wakeup(dev)) { + for (i = 0; i < ddata->pdata->nbuttons; i++) { + struct gpio_button_data *bdata = &ddata->data[i]; + if (bdata->button->wakeup) + enable_irq_wake(bdata->irq); + } + } else { + mutex_lock(&input->mutex); + if (input->users) + gpio_keys_close(input); + mutex_unlock(&input->mutex); + } + + return 0; +} + +static int gpio_keys_resume(struct device *dev) +{ + struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); + struct input_dev *input = ddata->input; + int error = 0; + int i; + + if (device_may_wakeup(dev)) { + for (i = 0; i < ddata->pdata->nbuttons; i++) { + struct gpio_button_data *bdata = &ddata->data[i]; + if (bdata->button->wakeup) + disable_irq_wake(bdata->irq); + } + } else { + mutex_lock(&input->mutex); + if (input->users) + error = gpio_keys_open(input); + mutex_unlock(&input->mutex); + } + + if (error) + return error; + + gpio_keys_report_state(ddata); + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume); + +static struct platform_driver gpio_keys_device_driver = { + .probe = gpio_keys_probe, + .remove = gpio_keys_remove, + .driver = { + .name = "gpio-keys", + .pm = &gpio_keys_pm_ops, + .of_match_table = of_match_ptr(gpio_keys_of_match), + } +}; + +static int __init gpio_keys_init(void) +{ + return platform_driver_register(&gpio_keys_device_driver); +} + +static void __exit gpio_keys_exit(void) +{ + platform_driver_unregister(&gpio_keys_device_driver); +} + +late_initcall(gpio_keys_init); +module_exit(gpio_keys_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>"); +MODULE_DESCRIPTION("Keyboard driver for GPIOs"); +MODULE_ALIAS("platform:gpio-keys"); |