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Release 4.14 drivers/input/input-polldev.c

Directory: drivers/input
/*
 * 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); }

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Stephen Hemminger2755.10%125.00%
Dmitry Torokhov1938.78%250.00%
Samu Onkalo36.12%125.00%
Total49100.00%4100.00%


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); }

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Samu Onkalo40100.00%1100.00%
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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; }

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Dmitry Torokhov4981.67%360.00%
Samu Onkalo1118.33%240.00%
Total60100.00%5100.00%


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); }

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Dmitry Torokhov2866.67%250.00%
Samu Onkalo1330.95%125.00%
Stephen Hemminger12.38%125.00%
Total42100.00%4100.00%

/* 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); }

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Samu Onkalo42100.00%1100.00%
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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; }

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Samu Onkalo13591.84%150.00%
JJ Ding128.16%150.00%
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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); }

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Samu Onkalo42100.00%1100.00%
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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); }

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Samu Onkalo42100.00%1100.00%
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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; }

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Dmitry Torokhov62100.00%1100.00%
Total62100.00%1100.00%

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; }

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Dmitry Torokhov33100.00%1100.00%
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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); }

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Dmitry Torokhov62100.00%1100.00%
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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. */ }

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Dmitry Torokhov58100.00%1100.00%
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/** * 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; }

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Dmitry Torokhov97100.00%1100.00%
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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); } }

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Dmitry Torokhov54100.00%2100.00%
Total54100.00%2100.00%

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; }

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Dmitry Torokhov16883.17%583.33%
Samu Onkalo3416.83%116.67%
Total202100.00%6100.00%

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); }

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Dmitry Torokhov43100.00%2100.00%
Total43100.00%2100.00%

EXPORT_SYMBOL(input_unregister_polled_device);

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Dmitry Torokhov74159.14%847.06%
Samu Onkalo43935.04%317.65%
Stephen Hemminger282.23%15.88%
Éric Piel201.60%15.88%
JJ Ding120.96%15.88%
Joe Perches70.56%15.88%
Tejun Heo30.24%15.88%
Paul Gortmaker30.24%15.88%
Total1253100.00%17100.00%
Directory: drivers/input
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