litmus-rt.git - The LITMUS^RT kernel.

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Diffstat (limited to 'drivers/bluetooth/dtl1_cs.c')

0 files changed, 0 insertions, 0 deletions

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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. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/jiffies.h> #include <linux/slab.h> #include <linux/mutex.h> #include <linux/workqueue.h> #include <linux/module.h> #include <linux/input-polldev.h> MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>"); MODULE_DESCRIPTION("Generic implementation of a polled input device"); MODULE_LICENSE("GPL v2"); MODULE_VERSION("0.1"); 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; if (interval < polldev->poll_interval_min) return -EINVAL; if (interval > polldev->poll_interval_max) return -EINVAL; mutex_lock(&input->mutex); polldev->poll_interval = interval; if (input->users) { cancel_delayed_work_sync(&polldev->work); if (polldev->poll_interval > 0) input_polldev_queue_work(polldev); } mutex_unlock(&input->mutex); return count; } static DEVICE_ATTR(poll, S_IRUGO | S_IWUSR, input_polldev_get_poll, input_polldev_set_poll); static ssize_t input_polldev_get_max(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_max); } static DEVICE_ATTR(max, S_IRUGO, input_polldev_get_max, NULL); static ssize_t input_polldev_get_min(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_min); } static DEVICE_ATTR(min, S_IRUGO, input_polldev_get_min, NULL); static struct attribute *sysfs_attrs[] = { &dev_attr_poll.attr, &dev_attr_max.attr, &dev_attr_min.attr, NULL }; static struct attribute_group input_polldev_attribute_group = { .attrs = sysfs_attrs }; /** * input_allocate_polled_device - allocate memory for polled device * * The function allocates memory for a polled device and also * for an input device associated with this polled device. */ struct input_polled_dev *input_allocate_polled_device(void) { struct input_polled_dev *dev; dev = kzalloc(sizeof(struct input_polled_dev), GFP_KERNEL); if (!dev) return NULL; dev->input = input_allocate_device(); if (!dev->input) { kfree(dev); return NULL; } return dev; } EXPORT_SYMBOL(input_allocate_polled_device); /** * input_free_polled_device - free memory allocated for polled device * @dev: device to free * * The function frees memory allocated for polling device and drops * reference to the associated input device. */ void input_free_polled_device(struct input_polled_dev *dev) { if (dev) { input_free_device(dev->input); kfree(dev); } } EXPORT_SYMBOL(input_free_polled_device); /** * input_register_polled_device - register polled device * @dev: device to register * * The function registers previously initialized polled input device * with input layer. The device should be allocated with call to * input_allocate_polled_device(). Callers should also set up poll() * method and set up capabilities (id, name, phys, bits) of the * corresponding input_dev structure. */ int input_register_polled_device(struct input_polled_dev *dev) { struct input_dev *input = dev->input; int error; input_set_drvdata(input, dev); INIT_DELAYED_WORK(&dev->work, input_polled_device_work); if (!dev->poll_interval) dev->poll_interval = 500; if (!dev->poll_interval_max) dev->poll_interval_max = dev->poll_interval; input->open = input_open_polled_device; input->close = input_close_polled_device; error = input_register_device(input); if (error) return error; error = sysfs_create_group(&input->dev.kobj, &input_polldev_attribute_group); if (error) { input_unregister_device(input); return error; } /* * Take extra reference to the underlying input device so * that it survives call to input_unregister_polled_device() * and is deleted only after input_free_polled_device() * has been invoked. This is needed to ease task of freeing * sparse keymaps. */ input_get_device(input); return 0; } EXPORT_SYMBOL(input_register_polled_device); /** * input_unregister_polled_device - unregister polled device * @dev: device to unregister * * The function unregisters previously registered polled input * device from input layer. Polling is stopped and device is * ready to be freed with call to input_free_polled_device(). */ void input_unregister_polled_device(struct input_polled_dev *dev) { sysfs_remove_group(&dev->input->dev.kobj, &input_polldev_attribute_group); input_unregister_device(dev->input); } EXPORT_SYMBOL(input_unregister_polled_device);


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