+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Generic implementation of a polled input device
-
- * Copyright (c) 2007 Dmitry Torokhov
- */
-
-#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");
-
-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
-};
-
-static const struct attribute_group *input_polldev_attribute_groups[] = {
- &input_polldev_attribute_group,
- NULL
-};
-
-/**
- * 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);
-
-struct input_polled_devres {
- struct input_polled_dev *polldev;
-};
-
-static int devm_input_polldev_match(struct device *dev, void *res, void *data)
-{
- struct input_polled_devres *devres = res;
-
- return devres->polldev == data;
-}
-
-static void devm_input_polldev_release(struct device *dev, void *res)
-{
- struct input_polled_devres *devres = res;
- struct input_polled_dev *polldev = devres->polldev;
-
- dev_dbg(dev, "%s: dropping reference/freeing %s\n",
- __func__, dev_name(&polldev->input->dev));
-
- input_put_device(polldev->input);
- kfree(polldev);
-}
-
-static void devm_input_polldev_unregister(struct device *dev, void *res)
-{
- struct input_polled_devres *devres = res;
- struct input_polled_dev *polldev = devres->polldev;
-
- dev_dbg(dev, "%s: unregistering device %s\n",
- __func__, dev_name(&polldev->input->dev));
- input_unregister_device(polldev->input);
-
- /*
- * Note that we are still holding extra reference to the input
- * device so it will stick around until devm_input_polldev_release()
- * is called.
- */
-}
-
-/**
- * devm_input_allocate_polled_device - allocate managed polled device
- * @dev: device owning the polled device being created
- *
- * Returns prepared &struct input_polled_dev or %NULL.
- *
- * Managed polled input devices do not need to be explicitly unregistered
- * or freed as it will be done automatically when owner device unbinds
- * from * its driver (or binding fails). Once such managed polled device
- * is allocated, it is ready to be set up and registered in the same
- * fashion as regular polled input devices (using
- * input_register_polled_device() function).
- *
- * If you want to manually unregister and free such managed polled devices,
- * it can be still done by calling input_unregister_polled_device() and
- * input_free_polled_device(), although it is rarely needed.
- *
- * NOTE: the owner device is set up as parent of input device and users
- * should not override it.
- */
-struct input_polled_dev *devm_input_allocate_polled_device(struct device *dev)
-{
- struct input_polled_dev *polldev;
- struct input_polled_devres *devres;
-
- devres = devres_alloc(devm_input_polldev_release, sizeof(*devres),
- GFP_KERNEL);
- if (!devres)
- return NULL;
-
- polldev = input_allocate_polled_device();
- if (!polldev) {
- devres_free(devres);
- return NULL;
- }
-
- polldev->input->dev.parent = dev;
- polldev->devres_managed = true;
-
- devres->polldev = polldev;
- devres_add(dev, devres);
-
- return polldev;
-}
-EXPORT_SYMBOL(devm_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) {
- if (dev->devres_managed)
- WARN_ON(devres_destroy(dev->input->dev.parent,
- devm_input_polldev_release,
- devm_input_polldev_match,
- dev));
- input_put_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_polled_devres *devres = NULL;
- struct input_dev *input = dev->input;
- int error;
-
- if (dev->devres_managed) {
- devres = devres_alloc(devm_input_polldev_unregister,
- sizeof(*devres), GFP_KERNEL);
- if (!devres)
- return -ENOMEM;
-
- devres->polldev = dev;
- }
-
- 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;
-
- input->dev.groups = input_polldev_attribute_groups;
-
- error = input_register_device(input);
- if (error) {
- devres_free(devres);
- 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);
-
- if (dev->devres_managed) {
- dev_dbg(input->dev.parent, "%s: registering %s with devres.\n",
- __func__, dev_name(&input->dev));
- devres_add(input->dev.parent, devres);
- }
-
- 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)
-{
- if (dev->devres_managed)
- WARN_ON(devres_destroy(dev->input->dev.parent,
- devm_input_polldev_unregister,
- devm_input_polldev_match,
- dev));
-
- input_unregister_device(dev->input);
-}
-EXPORT_SYMBOL(input_unregister_polled_device);
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0-only */
-#ifndef _INPUT_POLLDEV_H
-#define _INPUT_POLLDEV_H
-
-/*
- * Copyright (c) 2007 Dmitry Torokhov
- */
-
-#include <linux/input.h>
-#include <linux/workqueue.h>
-
-/**
- * struct input_polled_dev - simple polled input device
- * @private: private driver data.
- * @open: driver-supplied method that prepares device for polling
- * (enabled the device and maybe flushes device state).
- * @close: driver-supplied method that is called when device is no
- * longer being polled. Used to put device into low power mode.
- * @poll: driver-supplied method that polls the device and posts
- * input events (mandatory).
- * @poll_interval: specifies how often the poll() method should be called.
- * Defaults to 500 msec unless overridden when registering the device.
- * @poll_interval_max: specifies upper bound for the poll interval.
- * Defaults to the initial value of @poll_interval.
- * @poll_interval_min: specifies lower bound for the poll interval.
- * Defaults to 0.
- * @input: input device structure associated with the polled device.
- * Must be properly initialized by the driver (id, name, phys, bits).
- *
- * Polled input device provides a skeleton for supporting simple input
- * devices that do not raise interrupts but have to be periodically
- * scanned or polled to detect changes in their state.
- */
-struct input_polled_dev {
- void *private;
-
- void (*open)(struct input_polled_dev *dev);
- void (*close)(struct input_polled_dev *dev);
- void (*poll)(struct input_polled_dev *dev);
- unsigned int poll_interval; /* msec */
- unsigned int poll_interval_max; /* msec */
- unsigned int poll_interval_min; /* msec */
-
- struct input_dev *input;
-
-/* private: */
- struct delayed_work work;
-
- bool devres_managed;
-};
-
-struct input_polled_dev *input_allocate_polled_device(void);
-struct input_polled_dev *devm_input_allocate_polled_device(struct device *dev);
-void input_free_polled_device(struct input_polled_dev *dev);
-int input_register_polled_device(struct input_polled_dev *dev);
-void input_unregister_polled_device(struct input_polled_dev *dev);
-
-#endif
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