diff options
Diffstat (limited to 'drivers/staging/android/timed_gpio.c')
| -rw-r--r-- | drivers/staging/android/timed_gpio.c | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/drivers/staging/android/timed_gpio.c b/drivers/staging/android/timed_gpio.c deleted file mode 100644 index be7cdaa783ae..000000000000 --- a/drivers/staging/android/timed_gpio.c +++ /dev/null @@ -1,166 +0,0 @@ -/* drivers/misc/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 <linux/gpio.h> - -#include "timed_output.h" -#include "timed_gpio.h" - - -struct timed_gpio_data { - struct timed_output_dev 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 *data = - container_of(timer, struct timed_gpio_data, timer); - - gpio_direction_output(data->gpio, data->active_low ? 1 : 0); - return HRTIMER_NORESTART; -} - -static int gpio_get_time(struct timed_output_dev *dev) -{ - struct timed_gpio_data *data = - container_of(dev, struct timed_gpio_data, dev); - - if (hrtimer_active(&data->timer)) { - ktime_t r = hrtimer_get_remaining(&data->timer); - struct timeval t = ktime_to_timeval(r); - return t.tv_sec * 1000 + t.tv_usec / 1000; - } else - return 0; -} - -static void gpio_enable(struct timed_output_dev *dev, int value) -{ - struct timed_gpio_data *data = - container_of(dev, struct timed_gpio_data, dev); - unsigned long flags; - - spin_lock_irqsave(&data->lock, flags); - - /* cancel previous timer and set GPIO according to value */ - hrtimer_cancel(&data->timer); - gpio_direction_output(data->gpio, data->active_low ? !value : !!value); - - if (value > 0) { - if (value > data->max_timeout) - value = data->max_timeout; - - hrtimer_start(&data->timer, - ktime_set(value / 1000, (value % 1000) * 1000000), - HRTIMER_MODE_REL); - } - - spin_unlock_irqrestore(&data->lock, flags); -} - -static int 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, j, 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->dev.name = cur_gpio->name; - gpio_dat->dev.get_time = gpio_get_time; - gpio_dat->dev.enable = gpio_enable; - ret = timed_output_dev_register(&gpio_dat->dev); - if (ret < 0) { - for (j = 0; j < i; j++) - timed_output_dev_unregister(&gpio_data[i].dev); - kfree(gpio_data); - return ret; - } - - 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); - } - - platform_set_drvdata(pdev, gpio_data); - - return 0; -} - -static int 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++) - timed_output_dev_unregister(&gpio_data[i].dev); - - kfree(gpio_data); - - return 0; -} - -static struct platform_driver timed_gpio_driver = { - .probe = timed_gpio_probe, - .remove = timed_gpio_remove, - .driver = { - .name = TIMED_GPIO_NAME, - .owner = THIS_MODULE, - }, -}; - -static int __init timed_gpio_init(void) -{ - return platform_driver_register(&timed_gpio_driver); -} - -static void __exit timed_gpio_exit(void) -{ - platform_driver_unregister(&timed_gpio_driver); -} - -module_init(timed_gpio_init); -module_exit(timed_gpio_exit); - -MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); -MODULE_DESCRIPTION("timed gpio driver"); -MODULE_LICENSE("GPL"); |