linux-imx
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/* * Generic implementation of a polled input device * Copyright (c) 2007 Dmitry Torokhov * * 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. */MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");MODULE_DESCRIPTION("Generic implementation of a polled input device");MODULE_LICENSE("GPL v2");static void input_polldev_queue_work(struct input_polled_dev *dev){ unsigned long delay; delay = msecs_to_jiffies(dev->poll_interval); if (delay >= HZ) delay = round_jiffies_relative(delay); queue_delayed_work(system_freezable_wq, &dev->work, delay);}static void input_polled_device_work(struct work_struct *work){ struct input_polled_dev *dev = container_of(work, struct input_polled_dev, work.work); dev->poll(dev); input_polldev_queue_work(dev);}static int input_open_polled_device(struct input_dev *input){ struct input_polled_dev *dev = input_get_drvdata(input); if (dev->open) dev->open(dev); /* Only start polling if polling is enabled */ if (dev->poll_interval > 0) { dev->poll(dev); input_polldev_queue_work(dev); } return 0;}static void input_close_polled_device(struct input_dev *input){ struct input_polled_dev *dev = input_get_drvdata(input); cancel_delayed_work_sync(&dev->work); if (dev->close) dev->close(dev);}/* SYSFS interface */static ssize_t input_polldev_get_poll(struct device *dev, struct device_attribute *attr, char *buf){ struct input_polled_dev *polldev = dev_get_drvdata(dev); return sprintf(buf, "%d\n", polldev->poll_interval);}static ssize_t input_polldev_set_poll(struct device *dev, struct device_attribute *attr, const char *buf, size_t count){ struct input_polled_dev *polldev = dev_get_drvdata(dev); struct input_dev *input = polldev->input; unsigned int interval; int err; err = kstrtouint(buf, 0, &interval); if (err) return err;