diff options
Diffstat (limited to 'drivers/android/timed_gpio.c')
| -rw-r--r-- | drivers/android/timed_gpio.c | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/drivers/android/timed_gpio.c b/drivers/android/timed_gpio.c deleted file mode 100644 index da6db415dda..00000000000 --- a/drivers/android/timed_gpio.c +++ /dev/null @@ -1,177 +0,0 @@ -/* drivers/android/timed_gpio.c - * - * Copyright (C) 2008 Google, Inc. - * Author: Mike Lockwood <lockwood@android.com> - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - */ - -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/hrtimer.h> -#include <linux/err.h> -#include <mach/gpio.h> - -#include <linux/android_timed_gpio.h> - - -static struct class *timed_gpio_class; - -struct timed_gpio_data { - struct device *dev; - struct hrtimer timer; - spinlock_t lock; - unsigned gpio; - int max_timeout; - u8 active_low; -}; - -static enum hrtimer_restart gpio_timer_func(struct hrtimer *timer) -{ - struct timed_gpio_data *gpio_data = container_of(timer, struct timed_gpio_data, timer); - - gpio_direction_output(gpio_data->gpio, gpio_data->active_low ? 1 : 0); - return HRTIMER_NORESTART; -} - -static ssize_t gpio_enable_show(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct timed_gpio_data *gpio_data = dev_get_drvdata(dev); - int remaining; - - if (hrtimer_active(&gpio_data->timer)) { - ktime_t r = hrtimer_get_remaining(&gpio_data->timer); - remaining = r.tv.sec * 1000 + r.tv.nsec / 1000000; - } else - remaining = 0; - - return sprintf(buf, "%d\n", remaining); -} - -static ssize_t gpio_enable_store( - struct device *dev, struct device_attribute *attr, - const char *buf, size_t size) -{ - struct timed_gpio_data *gpio_data = dev_get_drvdata(dev); - int value; - unsigned long flags; - - sscanf(buf, "%d", &value); - - spin_lock_irqsave(&gpio_data->lock, flags); - - /* cancel previous timer and set GPIO according to value */ - hrtimer_cancel(&gpio_data->timer); - gpio_direction_output(gpio_data->gpio, gpio_data->active_low ? !value : !!value); - - if (value > 0) { - if (value > gpio_data->max_timeout) - value = gpio_data->max_timeout; - - hrtimer_start(&gpio_data->timer, - ktime_set(value / 1000, (value % 1000) * 1000000), - HRTIMER_MODE_REL); - } - - spin_unlock_irqrestore(&gpio_data->lock, flags); - - return size; -} - -static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, gpio_enable_show, gpio_enable_store); - -static int android_timed_gpio_probe(struct platform_device *pdev) -{ - struct timed_gpio_platform_data *pdata = pdev->dev.platform_data; - struct timed_gpio *cur_gpio; - struct timed_gpio_data *gpio_data, *gpio_dat; - int i, ret = 0; - - if (!pdata) - return -EBUSY; - - gpio_data = kzalloc(sizeof(struct timed_gpio_data) * pdata->num_gpios, GFP_KERNEL); - if (!gpio_data) - return -ENOMEM; - - for (i = 0; i < pdata->num_gpios; i++) { - cur_gpio = &pdata->gpios[i]; - gpio_dat = &gpio_data[i]; - - hrtimer_init(&gpio_dat->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); - gpio_dat->timer.function = gpio_timer_func; - spin_lock_init(&gpio_dat->lock); - - gpio_dat->gpio = cur_gpio->gpio; - gpio_dat->max_timeout = cur_gpio->max_timeout; - gpio_dat->active_low = cur_gpio->active_low; - gpio_direction_output(gpio_dat->gpio, gpio_dat->active_low); - - gpio_dat->dev = device_create(timed_gpio_class, &pdev->dev, 0, "%s", cur_gpio->name); - if (unlikely(IS_ERR(gpio_dat->dev))) - return PTR_ERR(gpio_dat->dev); - - dev_set_drvdata(gpio_dat->dev, gpio_dat); - ret = device_create_file(gpio_dat->dev, &dev_attr_enable); - if (ret) - return ret; - } - - platform_set_drvdata(pdev, gpio_data); - - return 0; -} - -static int android_timed_gpio_remove(struct platform_device *pdev) -{ - struct timed_gpio_platform_data *pdata = pdev->dev.platform_data; - struct timed_gpio_data *gpio_data = platform_get_drvdata(pdev); - int i; - - for (i = 0; i < pdata->num_gpios; i++) { - device_remove_file(gpio_data[i].dev, &dev_attr_enable); - device_unregister(gpio_data[i].dev); - } - - kfree(gpio_data); - - return 0; -} - -static struct platform_driver android_timed_gpio_driver = { - .probe = android_timed_gpio_probe, - .remove = android_timed_gpio_remove, - .driver = { - .name = "android-timed-gpio", - .owner = THIS_MODULE, - }, -}; - -static int __init android_timed_gpio_init(void) -{ - timed_gpio_class = class_create(THIS_MODULE, "timed_output"); - if (IS_ERR(timed_gpio_class)) - return PTR_ERR(timed_gpio_class); - return platform_driver_register(&android_timed_gpio_driver); -} - -static void __exit android_timed_gpio_exit(void) -{ - class_destroy(timed_gpio_class); - platform_driver_unregister(&android_timed_gpio_driver); -} - -module_init(android_timed_gpio_init); -module_exit(android_timed_gpio_exit); - -MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); -MODULE_DESCRIPTION("Android timed gpio driver"); -MODULE_LICENSE("GPL"); |