forked from Minki/linux
Input: remove input_polled_dev implementation
Now that normal input devices support polling mode, and all users of input_polled_dev API have been converted, we can remove it. Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov
parent
f7bda6662f
commit
278b13ce3a
@ -25,15 +25,6 @@ Multitouch Library
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.. kernel-doc:: drivers/input/input-mt.c
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:export:
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Polled input devices
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--------------------
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.. kernel-doc:: include/linux/input-polldev.h
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:internal:
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.. kernel-doc:: drivers/input/input-polldev.c
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:export:
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Matrix keyboards/keypads
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------------------------
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@ -52,19 +52,6 @@ config INPUT_FF_MEMLESS
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To compile this driver as a module, choose M here: the
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module will be called ff-memless.
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config INPUT_POLLDEV
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tristate "Polled input device skeleton"
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help
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Say Y here if you are using a driver for an input
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device that periodically polls hardware state. This
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option is only useful for out-of-tree drivers since
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in-tree drivers select it automatically.
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If unsure, say N.
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To compile this driver as a module, choose M here: the
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module will be called input-polldev.
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config INPUT_SPARSEKMAP
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tristate "Sparse keymap support library"
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help
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@ -9,7 +9,6 @@ obj-$(CONFIG_INPUT) += input-core.o
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input-core-y := input.o input-compat.o input-mt.o input-poller.o ff-core.o
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obj-$(CONFIG_INPUT_FF_MEMLESS) += ff-memless.o
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obj-$(CONFIG_INPUT_POLLDEV) += input-polldev.o
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obj-$(CONFIG_INPUT_SPARSEKMAP) += sparse-keymap.o
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obj-$(CONFIG_INPUT_MATRIXKMAP) += matrix-keymap.o
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@ -1,362 +0,0 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Generic implementation of a polled input device
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* Copyright (c) 2007 Dmitry Torokhov
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/jiffies.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/workqueue.h>
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#include <linux/module.h>
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#include <linux/input-polldev.h>
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MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
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MODULE_DESCRIPTION("Generic implementation of a polled input device");
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MODULE_LICENSE("GPL v2");
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static void input_polldev_queue_work(struct input_polled_dev *dev)
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{
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unsigned long delay;
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delay = msecs_to_jiffies(dev->poll_interval);
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if (delay >= HZ)
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delay = round_jiffies_relative(delay);
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queue_delayed_work(system_freezable_wq, &dev->work, delay);
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}
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static void input_polled_device_work(struct work_struct *work)
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{
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struct input_polled_dev *dev =
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container_of(work, struct input_polled_dev, work.work);
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dev->poll(dev);
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input_polldev_queue_work(dev);
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}
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static int input_open_polled_device(struct input_dev *input)
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{
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struct input_polled_dev *dev = input_get_drvdata(input);
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if (dev->open)
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dev->open(dev);
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/* Only start polling if polling is enabled */
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if (dev->poll_interval > 0) {
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dev->poll(dev);
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input_polldev_queue_work(dev);
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}
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return 0;
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}
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static void input_close_polled_device(struct input_dev *input)
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{
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struct input_polled_dev *dev = input_get_drvdata(input);
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cancel_delayed_work_sync(&dev->work);
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if (dev->close)
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dev->close(dev);
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}
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/* SYSFS interface */
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static ssize_t input_polldev_get_poll(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct input_polled_dev *polldev = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", polldev->poll_interval);
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}
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static ssize_t input_polldev_set_poll(struct device *dev,
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struct device_attribute *attr, const char *buf,
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size_t count)
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{
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struct input_polled_dev *polldev = dev_get_drvdata(dev);
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struct input_dev *input = polldev->input;
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unsigned int interval;
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int err;
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err = kstrtouint(buf, 0, &interval);
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if (err)
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return err;
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if (interval < polldev->poll_interval_min)
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return -EINVAL;
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if (interval > polldev->poll_interval_max)
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return -EINVAL;
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mutex_lock(&input->mutex);
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polldev->poll_interval = interval;
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if (input->users) {
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cancel_delayed_work_sync(&polldev->work);
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if (polldev->poll_interval > 0)
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input_polldev_queue_work(polldev);
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}
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mutex_unlock(&input->mutex);
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return count;
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}
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static DEVICE_ATTR(poll, S_IRUGO | S_IWUSR, input_polldev_get_poll,
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input_polldev_set_poll);
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static ssize_t input_polldev_get_max(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct input_polled_dev *polldev = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", polldev->poll_interval_max);
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}
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static DEVICE_ATTR(max, S_IRUGO, input_polldev_get_max, NULL);
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static ssize_t input_polldev_get_min(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct input_polled_dev *polldev = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", polldev->poll_interval_min);
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}
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static DEVICE_ATTR(min, S_IRUGO, input_polldev_get_min, NULL);
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static struct attribute *sysfs_attrs[] = {
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&dev_attr_poll.attr,
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&dev_attr_max.attr,
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&dev_attr_min.attr,
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NULL
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};
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static struct attribute_group input_polldev_attribute_group = {
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.attrs = sysfs_attrs
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};
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static const struct attribute_group *input_polldev_attribute_groups[] = {
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&input_polldev_attribute_group,
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NULL
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};
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/**
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* input_allocate_polled_device - allocate memory for polled device
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*
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* The function allocates memory for a polled device and also
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* for an input device associated with this polled device.
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*/
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struct input_polled_dev *input_allocate_polled_device(void)
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{
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struct input_polled_dev *dev;
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dev = kzalloc(sizeof(struct input_polled_dev), GFP_KERNEL);
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if (!dev)
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return NULL;
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dev->input = input_allocate_device();
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if (!dev->input) {
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kfree(dev);
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return NULL;
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}
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return dev;
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}
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EXPORT_SYMBOL(input_allocate_polled_device);
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struct input_polled_devres {
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struct input_polled_dev *polldev;
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};
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static int devm_input_polldev_match(struct device *dev, void *res, void *data)
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{
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struct input_polled_devres *devres = res;
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return devres->polldev == data;
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}
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static void devm_input_polldev_release(struct device *dev, void *res)
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{
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struct input_polled_devres *devres = res;
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struct input_polled_dev *polldev = devres->polldev;
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dev_dbg(dev, "%s: dropping reference/freeing %s\n",
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__func__, dev_name(&polldev->input->dev));
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input_put_device(polldev->input);
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kfree(polldev);
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}
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static void devm_input_polldev_unregister(struct device *dev, void *res)
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{
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struct input_polled_devres *devres = res;
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struct input_polled_dev *polldev = devres->polldev;
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dev_dbg(dev, "%s: unregistering device %s\n",
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__func__, dev_name(&polldev->input->dev));
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input_unregister_device(polldev->input);
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/*
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* Note that we are still holding extra reference to the input
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* device so it will stick around until devm_input_polldev_release()
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* is called.
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*/
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}
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/**
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* devm_input_allocate_polled_device - allocate managed polled device
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* @dev: device owning the polled device being created
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*
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* Returns prepared &struct input_polled_dev or %NULL.
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*
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* Managed polled input devices do not need to be explicitly unregistered
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* or freed as it will be done automatically when owner device unbinds
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* from * its driver (or binding fails). Once such managed polled device
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* is allocated, it is ready to be set up and registered in the same
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* fashion as regular polled input devices (using
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* input_register_polled_device() function).
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*
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* If you want to manually unregister and free such managed polled devices,
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* it can be still done by calling input_unregister_polled_device() and
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* input_free_polled_device(), although it is rarely needed.
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*
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* NOTE: the owner device is set up as parent of input device and users
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* should not override it.
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*/
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struct input_polled_dev *devm_input_allocate_polled_device(struct device *dev)
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{
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struct input_polled_dev *polldev;
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struct input_polled_devres *devres;
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devres = devres_alloc(devm_input_polldev_release, sizeof(*devres),
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GFP_KERNEL);
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if (!devres)
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return NULL;
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polldev = input_allocate_polled_device();
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if (!polldev) {
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devres_free(devres);
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return NULL;
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}
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polldev->input->dev.parent = dev;
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polldev->devres_managed = true;
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devres->polldev = polldev;
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devres_add(dev, devres);
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return polldev;
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}
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EXPORT_SYMBOL(devm_input_allocate_polled_device);
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/**
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* input_free_polled_device - free memory allocated for polled device
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* @dev: device to free
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*
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* The function frees memory allocated for polling device and drops
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* reference to the associated input device.
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*/
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void input_free_polled_device(struct input_polled_dev *dev)
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{
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if (dev) {
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if (dev->devres_managed)
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WARN_ON(devres_destroy(dev->input->dev.parent,
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devm_input_polldev_release,
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devm_input_polldev_match,
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dev));
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input_put_device(dev->input);
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kfree(dev);
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}
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}
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EXPORT_SYMBOL(input_free_polled_device);
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/**
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* input_register_polled_device - register polled device
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* @dev: device to register
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*
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* The function registers previously initialized polled input device
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* with input layer. The device should be allocated with call to
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* input_allocate_polled_device(). Callers should also set up poll()
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* method and set up capabilities (id, name, phys, bits) of the
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* corresponding input_dev structure.
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*/
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int input_register_polled_device(struct input_polled_dev *dev)
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{
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struct input_polled_devres *devres = NULL;
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struct input_dev *input = dev->input;
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int error;
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if (dev->devres_managed) {
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devres = devres_alloc(devm_input_polldev_unregister,
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sizeof(*devres), GFP_KERNEL);
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if (!devres)
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return -ENOMEM;
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devres->polldev = dev;
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}
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input_set_drvdata(input, dev);
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INIT_DELAYED_WORK(&dev->work, input_polled_device_work);
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if (!dev->poll_interval)
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dev->poll_interval = 500;
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if (!dev->poll_interval_max)
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dev->poll_interval_max = dev->poll_interval;
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input->open = input_open_polled_device;
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input->close = input_close_polled_device;
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input->dev.groups = input_polldev_attribute_groups;
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error = input_register_device(input);
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if (error) {
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devres_free(devres);
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return error;
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}
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/*
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* Take extra reference to the underlying input device so
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* that it survives call to input_unregister_polled_device()
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* and is deleted only after input_free_polled_device()
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* has been invoked. This is needed to ease task of freeing
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* sparse keymaps.
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*/
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input_get_device(input);
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if (dev->devres_managed) {
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dev_dbg(input->dev.parent, "%s: registering %s with devres.\n",
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__func__, dev_name(&input->dev));
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devres_add(input->dev.parent, devres);
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}
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return 0;
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}
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EXPORT_SYMBOL(input_register_polled_device);
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/**
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* input_unregister_polled_device - unregister polled device
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* @dev: device to unregister
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*
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* The function unregisters previously registered polled input
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* device from input layer. Polling is stopped and device is
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* ready to be freed with call to input_free_polled_device().
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*/
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void input_unregister_polled_device(struct input_polled_dev *dev)
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{
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if (dev->devres_managed)
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WARN_ON(devres_destroy(dev->input->dev.parent,
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devm_input_polldev_unregister,
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devm_input_polldev_match,
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dev));
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input_unregister_device(dev->input);
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}
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EXPORT_SYMBOL(input_unregister_polled_device);
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@ -1,58 +0,0 @@
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/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef _INPUT_POLLDEV_H
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#define _INPUT_POLLDEV_H
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/*
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* Copyright (c) 2007 Dmitry Torokhov
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*/
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#include <linux/input.h>
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#include <linux/workqueue.h>
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/**
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* struct input_polled_dev - simple polled input device
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* @private: private driver data.
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* @open: driver-supplied method that prepares device for polling
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* (enabled the device and maybe flushes device state).
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* @close: driver-supplied method that is called when device is no
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* longer being polled. Used to put device into low power mode.
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* @poll: driver-supplied method that polls the device and posts
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* input events (mandatory).
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* @poll_interval: specifies how often the poll() method should be called.
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* Defaults to 500 msec unless overridden when registering the device.
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* @poll_interval_max: specifies upper bound for the poll interval.
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* Defaults to the initial value of @poll_interval.
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* @poll_interval_min: specifies lower bound for the poll interval.
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* Defaults to 0.
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* @input: input device structure associated with the polled device.
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* Must be properly initialized by the driver (id, name, phys, bits).
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*
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* Polled input device provides a skeleton for supporting simple input
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* devices that do not raise interrupts but have to be periodically
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* scanned or polled to detect changes in their state.
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*/
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struct input_polled_dev {
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void *private;
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void (*open)(struct input_polled_dev *dev);
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void (*close)(struct input_polled_dev *dev);
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void (*poll)(struct input_polled_dev *dev);
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unsigned int poll_interval; /* msec */
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unsigned int poll_interval_max; /* msec */
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unsigned int poll_interval_min; /* msec */
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struct input_dev *input;
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/* private: */
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struct delayed_work work;
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bool devres_managed;
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};
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struct input_polled_dev *input_allocate_polled_device(void);
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struct input_polled_dev *devm_input_allocate_polled_device(struct device *dev);
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void input_free_polled_device(struct input_polled_dev *dev);
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int input_register_polled_device(struct input_polled_dev *dev);
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void input_unregister_polled_device(struct input_polled_dev *dev);
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#endif
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