Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1089 insertions, 0 deletions

diff --git a/drivers/input/joydev.c b/drivers/input/joydev.c
new file mode 100644
index 000000000..675fcd095
--- /dev/null
+++ b/drivers/input/joydev.c
@@ -0,0 +1,1089 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Joystick device driver for the input driver suite.
+ *
+ * Copyright (c) 1999-2002 Vojtech Pavlik
+ * Copyright (c) 1999 Colin Van Dyke
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <asm/io.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/joystick.h>
+#include <linux/input.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/cdev.h>
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
+MODULE_DESCRIPTION("Joystick device interfaces");
+MODULE_SUPPORTED_DEVICE("input/js");
+MODULE_LICENSE("GPL");
+
+#define JOYDEV_MINOR_BASE	0
+#define JOYDEV_MINORS		16
+#define JOYDEV_BUFFER_SIZE	64
+
+struct joydev {
+	int open;
+	struct input_handle handle;
+	wait_queue_head_t wait;
+	struct list_head client_list;
+	spinlock_t client_lock; /* protects client_list */
+	struct mutex mutex;
+	struct device dev;
+	struct cdev cdev;
+	bool exist;
+
+	struct js_corr corr[ABS_CNT];
+	struct JS_DATA_SAVE_TYPE glue;
+	int nabs;
+	int nkey;
+	__u16 keymap[KEY_MAX - BTN_MISC + 1];
+	__u16 keypam[KEY_MAX - BTN_MISC + 1];
+	__u8 absmap[ABS_CNT];
+	__u8 abspam[ABS_CNT];
+	__s16 abs[ABS_CNT];
+};
+
+struct joydev_client {
+	struct js_event buffer[JOYDEV_BUFFER_SIZE];
+	int head;
+	int tail;
+	int startup;
+	spinlock_t buffer_lock; /* protects access to buffer, head and tail */
+	struct fasync_struct *fasync;
+	struct joydev *joydev;
+	struct list_head node;
+};
+
+static int joydev_correct(int value, struct js_corr *corr)
+{
+	switch (corr->type) {
+
+	case JS_CORR_NONE:
+		break;
+
+	case JS_CORR_BROKEN:
+		value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
+			((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
+			((corr->coef[2] * (value - corr->coef[0])) >> 14);
+		break;
+
+	default:
+		return 0;
+	}
+
+	return clamp(value, -32767, 32767);
+}
+
+static void joydev_pass_event(struct joydev_client *client,
+			      struct js_event *event)
+{
+	struct joydev *joydev = client->joydev;
+
+	/*
+	 * IRQs already disabled, just acquire the lock
+	 */
+	spin_lock(&client->buffer_lock);
+
+	client->buffer[client->head] = *event;
+
+	if (client->startup == joydev->nabs + joydev->nkey) {
+		client->head++;
+		client->head &= JOYDEV_BUFFER_SIZE - 1;
+		if (client->tail == client->head)
+			client->startup = 0;
+	}
+
+	spin_unlock(&client->buffer_lock);
+
+	kill_fasync(&client->fasync, SIGIO, POLL_IN);
+}
+
+static void joydev_event(struct input_handle *handle,
+			 unsigned int type, unsigned int code, int value)
+{
+	struct joydev *joydev = handle->private;
+	struct joydev_client *client;
+	struct js_event event;
+
+	switch (type) {
+
+	case EV_KEY:
+		if (code < BTN_MISC || value == 2)
+			return;
+		event.type = JS_EVENT_BUTTON;
+		event.number = joydev->keymap[code - BTN_MISC];
+		event.value = value;
+		break;
+
+	case EV_ABS:
+		event.type = JS_EVENT_AXIS;
+		event.number = joydev->absmap[code];
+		event.value = joydev_correct(value,
+					&joydev->corr[event.number]);
+		if (event.value == joydev->abs[event.number])
+			return;
+		joydev->abs[event.number] = event.value;
+		break;
+
+	default:
+		return;
+	}
+
+	event.time = jiffies_to_msecs(jiffies);
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(client, &joydev->client_list, node)
+		joydev_pass_event(client, &event);
+	rcu_read_unlock();
+
+	wake_up_interruptible(&joydev->wait);
+}
+
+static int joydev_fasync(int fd, struct file *file, int on)
+{
+	struct joydev_client *client = file->private_data;
+
+	return fasync_helper(fd, file, on, &client->fasync);
+}
+
+static void joydev_free(struct device *dev)
+{
+	struct joydev *joydev = container_of(dev, struct joydev, dev);
+
+	input_put_device(joydev->handle.dev);
+	kfree(joydev);
+}
+
+static void joydev_attach_client(struct joydev *joydev,
+				 struct joydev_client *client)
+{
+	spin_lock(&joydev->client_lock);
+	list_add_tail_rcu(&client->node, &joydev->client_list);
+	spin_unlock(&joydev->client_lock);
+}
+
+static void joydev_detach_client(struct joydev *joydev,
+				 struct joydev_client *client)
+{
+	spin_lock(&joydev->client_lock);
+	list_del_rcu(&client->node);
+	spin_unlock(&joydev->client_lock);
+	synchronize_rcu();
+}
+
+static void joydev_refresh_state(struct joydev *joydev)
+{
+	struct input_dev *dev = joydev->handle.dev;
+	int i, val;
+
+	for (i = 0; i < joydev->nabs; i++) {
+		val = input_abs_get_val(dev, joydev->abspam[i]);
+		joydev->abs[i] = joydev_correct(val, &joydev->corr[i]);
+	}
+}
+
+static int joydev_open_device(struct joydev *joydev)
+{
+	int retval;
+
+	retval = mutex_lock_interruptible(&joydev->mutex);
+	if (retval)
+		return retval;
+
+	if (!joydev->exist)
+		retval = -ENODEV;
+	else if (!joydev->open++) {
+		retval = input_open_device(&joydev->handle);
+		if (retval)
+			joydev->open--;
+		else
+			joydev_refresh_state(joydev);
+	}
+
+	mutex_unlock(&joydev->mutex);
+	return retval;
+}
+
+static void joydev_close_device(struct joydev *joydev)
+{
+	mutex_lock(&joydev->mutex);
+
+	if (joydev->exist && !--joydev->open)
+		input_close_device(&joydev->handle);
+
+	mutex_unlock(&joydev->mutex);
+}
+
+/*
+ * Wake up users waiting for IO so they can disconnect from
+ * dead device.
+ */
+static void joydev_hangup(struct joydev *joydev)
+{
+	struct joydev_client *client;
+
+	spin_lock(&joydev->client_lock);
+	list_for_each_entry(client, &joydev->client_list, node)
+		kill_fasync(&client->fasync, SIGIO, POLL_HUP);
+	spin_unlock(&joydev->client_lock);
+
+	wake_up_interruptible(&joydev->wait);
+}
+
+static int joydev_release(struct inode *inode, struct file *file)
+{
+	struct joydev_client *client = file->private_data;
+	struct joydev *joydev = client->joydev;
+
+	joydev_detach_client(joydev, client);
+	kfree(client);
+
+	joydev_close_device(joydev);
+
+	return 0;
+}
+
+static int joydev_open(struct inode *inode, struct file *file)
+{
+	struct joydev *joydev =
+			container_of(inode->i_cdev, struct joydev, cdev);
+	struct joydev_client *client;
+	int error;
+
+	client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
+	if (!client)
+		return -ENOMEM;
+
+	spin_lock_init(&client->buffer_lock);
+	client->joydev = joydev;
+	joydev_attach_client(joydev, client);
+
+	error = joydev_open_device(joydev);
+	if (error)
+		goto err_free_client;
+
+	file->private_data = client;
+	stream_open(inode, file);
+
+	return 0;
+
+ err_free_client:
+	joydev_detach_client(joydev, client);
+	kfree(client);
+	return error;
+}
+
+static int joydev_generate_startup_event(struct joydev_client *client,
+					 struct input_dev *input,
+					 struct js_event *event)
+{
+	struct joydev *joydev = client->joydev;
+	int have_event;
+
+	spin_lock_irq(&client->buffer_lock);
+
+	have_event = client->startup < joydev->nabs + joydev->nkey;
+
+	if (have_event) {
+
+		event->time = jiffies_to_msecs(jiffies);
+		if (client->startup < joydev->nkey) {
+			event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
+			event->number = client->startup;
+			event->value = !!test_bit(joydev->keypam[event->number],
+						  input->key);
+		} else {
+			event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
+			event->number = client->startup - joydev->nkey;
+			event->value = joydev->abs[event->number];
+		}
+		client->startup++;
+	}
+
+	spin_unlock_irq(&client->buffer_lock);
+
+	return have_event;
+}
+
+static int joydev_fetch_next_event(struct joydev_client *client,
+				   struct js_event *event)
+{
+	int have_event;
+
+	spin_lock_irq(&client->buffer_lock);
+
+	have_event = client->head != client->tail;
+	if (have_event) {
+		*event = client->buffer[client->tail++];
+		client->tail &= JOYDEV_BUFFER_SIZE - 1;
+	}
+
+	spin_unlock_irq(&client->buffer_lock);
+
+	return have_event;
+}
+
+/*
+ * Old joystick interface
+ */
+static ssize_t joydev_0x_read(struct joydev_client *client,
+			      struct input_dev *input,
+			      char __user *buf)
+{
+	struct joydev *joydev = client->joydev;
+	struct JS_DATA_TYPE data;
+	int i;
+
+	spin_lock_irq(&input->event_lock);
+
+	/*
+	 * Get device state
+	 */
+	for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
+		data.buttons |=
+			test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
+	data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
+	data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
+
+	/*
+	 * Reset reader's event queue
+	 */
+	spin_lock(&client->buffer_lock);
+	client->startup = 0;
+	client->tail = client->head;
+	spin_unlock(&client->buffer_lock);
+
+	spin_unlock_irq(&input->event_lock);
+
+	if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
+		return -EFAULT;
+
+	return sizeof(struct JS_DATA_TYPE);
+}
+
+static inline int joydev_data_pending(struct joydev_client *client)
+{
+	struct joydev *joydev = client->joydev;
+
+	return client->startup < joydev->nabs + joydev->nkey ||
+		client->head != client->tail;
+}
+
+static ssize_t joydev_read(struct file *file, char __user *buf,
+			   size_t count, loff_t *ppos)
+{
+	struct joydev_client *client = file->private_data;
+	struct joydev *joydev = client->joydev;
+	struct input_dev *input = joydev->handle.dev;
+	struct js_event event;
+	int retval;
+
+	if (!joydev->exist)
+		return -ENODEV;
+
+	if (count < sizeof(struct js_event))
+		return -EINVAL;
+
+	if (count == sizeof(struct JS_DATA_TYPE))
+		return joydev_0x_read(client, input, buf);
+
+	if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
+		return -EAGAIN;
+
+	retval = wait_event_interruptible(joydev->wait,
+			!joydev->exist || joydev_data_pending(client));
+	if (retval)
+		return retval;
+
+	if (!joydev->exist)
+		return -ENODEV;
+
+	while (retval + sizeof(struct js_event) <= count &&
+	       joydev_generate_startup_event(client, input, &event)) {
+
+		if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
+			return -EFAULT;
+
+		retval += sizeof(struct js_event);
+	}
+
+	while (retval + sizeof(struct js_event) <= count &&
+	       joydev_fetch_next_event(client, &event)) {
+
+		if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
+			return -EFAULT;
+
+		retval += sizeof(struct js_event);
+	}
+
+	return retval;
+}
+
+/* No kernel lock - fine */
+static __poll_t joydev_poll(struct file *file, poll_table *wait)
+{
+	struct joydev_client *client = file->private_data;
+	struct joydev *joydev = client->joydev;
+
+	poll_wait(file, &joydev->wait, wait);
+	return (joydev_data_pending(client) ? (EPOLLIN | EPOLLRDNORM) : 0) |
+		(joydev->exist ?  0 : (EPOLLHUP | EPOLLERR));
+}
+
+static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev,
+				     void __user *argp, size_t len)
+{
+	__u8 *abspam;
+	int i;
+	int retval = 0;
+
+	len = min(len, sizeof(joydev->abspam));
+
+	/* Validate the map. */
+	abspam = memdup_user(argp, len);
+	if (IS_ERR(abspam))
+		return PTR_ERR(abspam);
+
+	for (i = 0; i < len && i < joydev->nabs; i++) {
+		if (abspam[i] > ABS_MAX) {
+			retval = -EINVAL;
+			goto out;
+		}
+	}
+
+	memcpy(joydev->abspam, abspam, len);
+
+	for (i = 0; i < joydev->nabs; i++)
+		joydev->absmap[joydev->abspam[i]] = i;
+
+ out:
+	kfree(abspam);
+	return retval;
+}
+
+static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
+				      void __user *argp, size_t len)
+{
+	__u16 *keypam;
+	int i;
+	int retval = 0;
+
+	if (len % sizeof(*keypam))
+		return -EINVAL;
+
+	len = min(len, sizeof(joydev->keypam));
+
+	/* Validate the map. */
+	keypam = memdup_user(argp, len);
+	if (IS_ERR(keypam))
+		return PTR_ERR(keypam);
+
+	for (i = 0; i < (len / 2) && i < joydev->nkey; i++) {
+		if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
+			retval = -EINVAL;
+			goto out;
+		}
+	}
+
+	memcpy(joydev->keypam, keypam, len);
+
+	for (i = 0; i < joydev->nkey; i++)
+		joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
+
+ out:
+	kfree(keypam);
+	return retval;
+}
+
+
+static int joydev_ioctl_common(struct joydev *joydev,
+				unsigned int cmd, void __user *argp)
+{
+	struct input_dev *dev = joydev->handle.dev;
+	size_t len;
+	int i;
+	const char *name;
+
+	/* Process fixed-sized commands. */
+	switch (cmd) {
+
+	case JS_SET_CAL:
+		return copy_from_user(&joydev->glue.JS_CORR, argp,
+				sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
+
+	case JS_GET_CAL:
+		return copy_to_user(argp, &joydev->glue.JS_CORR,
+				sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
+
+	case JS_SET_TIMEOUT:
+		return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
+
+	case JS_GET_TIMEOUT:
+		return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
+
+	case JSIOCGVERSION:
+		return put_user(JS_VERSION, (__u32 __user *) argp);
+
+	case JSIOCGAXES:
+		return put_user(joydev->nabs, (__u8 __user *) argp);
+
+	case JSIOCGBUTTONS:
+		return put_user(joydev->nkey, (__u8 __user *) argp);
+
+	case JSIOCSCORR:
+		if (copy_from_user(joydev->corr, argp,
+			      sizeof(joydev->corr[0]) * joydev->nabs))
+			return -EFAULT;
+
+		for (i = 0; i < joydev->nabs; i++) {
+			int val = input_abs_get_val(dev, joydev->abspam[i]);
+			joydev->abs[i] = joydev_correct(val, &joydev->corr[i]);
+		}
+		return 0;
+
+	case JSIOCGCORR:
+		return copy_to_user(argp, joydev->corr,
+			sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
+
+	}
+
+	/*
+	 * Process variable-sized commands (the axis and button map commands
+	 * are considered variable-sized to decouple them from the values of
+	 * ABS_MAX and KEY_MAX).
+	 */
+	switch (cmd & ~IOCSIZE_MASK) {
+
+	case (JSIOCSAXMAP & ~IOCSIZE_MASK):
+		return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd));
+
+	case (JSIOCGAXMAP & ~IOCSIZE_MASK):
+		len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
+		return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
+
+	case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
+		return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd));
+
+	case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
+		len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
+		return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
+
+	case JSIOCGNAME(0):
+		name = dev->name;
+		if (!name)
+			return 0;
+
+		len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
+		return copy_to_user(argp, name, len) ? -EFAULT : len;
+	}
+
+	return -EINVAL;
+}
+
+#ifdef CONFIG_COMPAT
+static long joydev_compat_ioctl(struct file *file,
+				unsigned int cmd, unsigned long arg)
+{
+	struct joydev_client *client = file->private_data;
+	struct joydev *joydev = client->joydev;
+	void __user *argp = (void __user *)arg;
+	s32 tmp32;
+	struct JS_DATA_SAVE_TYPE_32 ds32;
+	int retval;
+
+	retval = mutex_lock_interruptible(&joydev->mutex);
+	if (retval)
+		return retval;
+
+	if (!joydev->exist) {
+		retval = -ENODEV;
+		goto out;
+	}
+
+	switch (cmd) {
+
+	case JS_SET_TIMELIMIT:
+		retval = get_user(tmp32, (s32 __user *) arg);
+		if (retval == 0)
+			joydev->glue.JS_TIMELIMIT = tmp32;
+		break;
+
+	case JS_GET_TIMELIMIT:
+		tmp32 = joydev->glue.JS_TIMELIMIT;
+		retval = put_user(tmp32, (s32 __user *) arg);
+		break;
+
+	case JS_SET_ALL:
+		retval = copy_from_user(&ds32, argp,
+					sizeof(ds32)) ? -EFAULT : 0;
+		if (retval == 0) {
+			joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
+			joydev->glue.BUSY          = ds32.BUSY;
+			joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
+			joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
+			joydev->glue.JS_SAVE       = ds32.JS_SAVE;
+			joydev->glue.JS_CORR       = ds32.JS_CORR;
+		}
+		break;
+
+	case JS_GET_ALL:
+		ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
+		ds32.BUSY          = joydev->glue.BUSY;
+		ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
+		ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
+		ds32.JS_SAVE       = joydev->glue.JS_SAVE;
+		ds32.JS_CORR       = joydev->glue.JS_CORR;
+
+		retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
+		break;
+
+	default:
+		retval = joydev_ioctl_common(joydev, cmd, argp);
+		break;
+	}
+
+ out:
+	mutex_unlock(&joydev->mutex);
+	return retval;
+}
+#endif /* CONFIG_COMPAT */
+
+static long joydev_ioctl(struct file *file,
+			 unsigned int cmd, unsigned long arg)
+{
+	struct joydev_client *client = file->private_data;
+	struct joydev *joydev = client->joydev;
+	void __user *argp = (void __user *)arg;
+	int retval;
+
+	retval = mutex_lock_interruptible(&joydev->mutex);
+	if (retval)
+		return retval;
+
+	if (!joydev->exist) {
+		retval = -ENODEV;
+		goto out;
+	}
+
+	switch (cmd) {
+
+	case JS_SET_TIMELIMIT:
+		retval = get_user(joydev->glue.JS_TIMELIMIT,
+				  (long __user *) arg);
+		break;
+
+	case JS_GET_TIMELIMIT:
+		retval = put_user(joydev->glue.JS_TIMELIMIT,
+				  (long __user *) arg);
+		break;
+
+	case JS_SET_ALL:
+		retval = copy_from_user(&joydev->glue, argp,
+					sizeof(joydev->glue)) ? -EFAULT : 0;
+		break;
+
+	case JS_GET_ALL:
+		retval = copy_to_user(argp, &joydev->glue,
+				      sizeof(joydev->glue)) ? -EFAULT : 0;
+		break;
+
+	default:
+		retval = joydev_ioctl_common(joydev, cmd, argp);
+		break;
+	}
+ out:
+	mutex_unlock(&joydev->mutex);
+	return retval;
+}
+
+static const struct file_operations joydev_fops = {
+	.owner		= THIS_MODULE,
+	.read		= joydev_read,
+	.poll		= joydev_poll,
+	.open		= joydev_open,
+	.release	= joydev_release,
+	.unlocked_ioctl	= joydev_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= joydev_compat_ioctl,
+#endif
+	.fasync		= joydev_fasync,
+	.llseek		= no_llseek,
+};
+
+/*
+ * Mark device non-existent. This disables writes, ioctls and
+ * prevents new users from opening the device. Already posted
+ * blocking reads will stay, however new ones will fail.
+ */
+static void joydev_mark_dead(struct joydev *joydev)
+{
+	mutex_lock(&joydev->mutex);
+	joydev->exist = false;
+	mutex_unlock(&joydev->mutex);
+}
+
+static void joydev_cleanup(struct joydev *joydev)
+{
+	struct input_handle *handle = &joydev->handle;
+
+	joydev_mark_dead(joydev);
+	joydev_hangup(joydev);
+
+	/* joydev is marked dead so no one else accesses joydev->open */
+	if (joydev->open)
+		input_close_device(handle);
+}
+
+/*
+ * These codes are copied from from hid-ids.h, unfortunately there is no common
+ * usb_ids/bt_ids.h header.
+ */
+#define USB_VENDOR_ID_SONY			0x054c
+#define USB_DEVICE_ID_SONY_PS3_CONTROLLER		0x0268
+#define USB_DEVICE_ID_SONY_PS4_CONTROLLER		0x05c4
+#define USB_DEVICE_ID_SONY_PS4_CONTROLLER_2		0x09cc
+#define USB_DEVICE_ID_SONY_PS4_CONTROLLER_DONGLE	0x0ba0
+
+#define USB_VENDOR_ID_THQ			0x20d6
+#define USB_DEVICE_ID_THQ_PS3_UDRAW			0xcb17
+
+#define ACCEL_DEV(vnd, prd)						\
+	{								\
+		.flags = INPUT_DEVICE_ID_MATCH_VENDOR |			\
+				INPUT_DEVICE_ID_MATCH_PRODUCT |		\
+				INPUT_DEVICE_ID_MATCH_PROPBIT,		\
+		.vendor = (vnd),					\
+		.product = (prd),					\
+		.propbit = { BIT_MASK(INPUT_PROP_ACCELEROMETER) },	\
+	}
+
+static const struct input_device_id joydev_blacklist[] = {
+	/* Avoid touchpads and touchscreens */
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
+				INPUT_DEVICE_ID_MATCH_KEYBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+		.keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
+	},
+	/* Avoid tablets, digitisers and similar devices */
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
+				INPUT_DEVICE_ID_MATCH_KEYBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+		.keybit = { [BIT_WORD(BTN_DIGI)] = BIT_MASK(BTN_DIGI) },
+	},
+	/* Disable accelerometers on composite devices */
+	ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS3_CONTROLLER),
+	ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER),
+	ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER_2),
+	ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER_DONGLE),
+	ACCEL_DEV(USB_VENDOR_ID_THQ, USB_DEVICE_ID_THQ_PS3_UDRAW),
+	{ /* sentinel */ }
+};
+
+static bool joydev_dev_is_blacklisted(struct input_dev *dev)
+{
+	const struct input_device_id *id;
+
+	for (id = joydev_blacklist; id->flags; id++) {
+		if (input_match_device_id(dev, id)) {
+			dev_dbg(&dev->dev,
+				"joydev: blacklisting '%s'\n", dev->name);
+			return true;
+		}
+	}
+
+	return false;
+}
+
+static bool joydev_dev_is_absolute_mouse(struct input_dev *dev)
+{
+	DECLARE_BITMAP(jd_scratch, KEY_CNT);
+	bool ev_match = false;
+
+	BUILD_BUG_ON(ABS_CNT > KEY_CNT || EV_CNT > KEY_CNT);
+
+	/*
+	 * Virtualization (VMware, etc) and remote management (HP
+	 * ILO2) solutions use absolute coordinates for their virtual
+	 * pointing devices so that there is one-to-one relationship
+	 * between pointer position on the host screen and virtual
+	 * guest screen, and so their mice use ABS_X, ABS_Y and 3
+	 * primary button events. This clashes with what joydev
+	 * considers to be joysticks (a device with at minimum ABS_X
+	 * axis).
+	 *
+	 * Here we are trying to separate absolute mice from
+	 * joysticks. A device is, for joystick detection purposes,
+	 * considered to be an absolute mouse if the following is
+	 * true:
+	 *
+	 * 1) Event types are exactly
+	 *      EV_ABS, EV_KEY and EV_SYN
+	 *    or
+	 *      EV_ABS, EV_KEY, EV_SYN and EV_MSC
+	 *    or
+	 *      EV_ABS, EV_KEY, EV_SYN, EV_MSC and EV_REL.
+	 * 2) Absolute events are exactly ABS_X and ABS_Y.
+	 * 3) Keys are exactly BTN_LEFT, BTN_RIGHT and BTN_MIDDLE.
+	 * 4) Device is not on "Amiga" bus.
+	 */
+
+	bitmap_zero(jd_scratch, EV_CNT);
+	/* VMware VMMouse, HP ILO2 */
+	__set_bit(EV_ABS, jd_scratch);
+	__set_bit(EV_KEY, jd_scratch);
+	__set_bit(EV_SYN, jd_scratch);
+	if (bitmap_equal(jd_scratch, dev->evbit, EV_CNT))
+		ev_match = true;
+
+	/* HP ILO2, AMI BMC firmware */
+	__set_bit(EV_MSC, jd_scratch);
+	if (bitmap_equal(jd_scratch, dev->evbit, EV_CNT))
+		ev_match = true;
+
+	/* VMware Virtual USB Mouse, QEMU USB Tablet, ATEN BMC firmware */
+	__set_bit(EV_REL, jd_scratch);
+	if (bitmap_equal(jd_scratch, dev->evbit, EV_CNT))
+		ev_match = true;
+
+	if (!ev_match)
+		return false;
+
+	bitmap_zero(jd_scratch, ABS_CNT);
+	__set_bit(ABS_X, jd_scratch);
+	__set_bit(ABS_Y, jd_scratch);
+	if (!bitmap_equal(dev->absbit, jd_scratch, ABS_CNT))
+		return false;
+
+	bitmap_zero(jd_scratch, KEY_CNT);
+	__set_bit(BTN_LEFT, jd_scratch);
+	__set_bit(BTN_RIGHT, jd_scratch);
+	__set_bit(BTN_MIDDLE, jd_scratch);
+
+	if (!bitmap_equal(dev->keybit, jd_scratch, KEY_CNT))
+		return false;
+
+	/*
+	 * Amiga joystick (amijoy) historically uses left/middle/right
+	 * button events.
+	 */
+	if (dev->id.bustype == BUS_AMIGA)
+		return false;
+
+	return true;
+}
+
+static bool joydev_match(struct input_handler *handler, struct input_dev *dev)
+{
+	/* Disable blacklisted devices */
+	if (joydev_dev_is_blacklisted(dev))
+		return false;
+
+	/* Avoid absolute mice */
+	if (joydev_dev_is_absolute_mouse(dev))
+		return false;
+
+	return true;
+}
+
+static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
+			  const struct input_device_id *id)
+{
+	struct joydev *joydev;
+	int i, j, t, minor, dev_no;
+	int error;
+
+	minor = input_get_new_minor(JOYDEV_MINOR_BASE, JOYDEV_MINORS, true);
+	if (minor < 0) {
+		error = minor;
+		pr_err("failed to reserve new minor: %d\n", error);
+		return error;
+	}
+
+	joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
+	if (!joydev) {
+		error = -ENOMEM;
+		goto err_free_minor;
+	}
+
+	INIT_LIST_HEAD(&joydev->client_list);
+	spin_lock_init(&joydev->client_lock);
+	mutex_init(&joydev->mutex);
+	init_waitqueue_head(&joydev->wait);
+	joydev->exist = true;
+
+	dev_no = minor;
+	/* Normalize device number if it falls into legacy range */
+	if (dev_no < JOYDEV_MINOR_BASE + JOYDEV_MINORS)
+		dev_no -= JOYDEV_MINOR_BASE;
+	dev_set_name(&joydev->dev, "js%d", dev_no);
+
+	joydev->handle.dev = input_get_device(dev);
+	joydev->handle.name = dev_name(&joydev->dev);
+	joydev->handle.handler = handler;
+	joydev->handle.private = joydev;
+
+	for_each_set_bit(i, dev->absbit, ABS_CNT) {
+		joydev->absmap[i] = joydev->nabs;
+		joydev->abspam[joydev->nabs] = i;
+		joydev->nabs++;
+	}
+
+	for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
+		if (test_bit(i + BTN_MISC, dev->keybit)) {
+			joydev->keymap[i] = joydev->nkey;
+			joydev->keypam[joydev->nkey] = i + BTN_MISC;
+			joydev->nkey++;
+		}
+
+	for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
+		if (test_bit(i + BTN_MISC, dev->keybit)) {
+			joydev->keymap[i] = joydev->nkey;
+			joydev->keypam[joydev->nkey] = i + BTN_MISC;
+			joydev->nkey++;
+		}
+
+	for (i = 0; i < joydev->nabs; i++) {
+		j = joydev->abspam[i];
+		if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) {
+			joydev->corr[i].type = JS_CORR_NONE;
+			continue;
+		}
+		joydev->corr[i].type = JS_CORR_BROKEN;
+		joydev->corr[i].prec = input_abs_get_fuzz(dev, j);
+
+		t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2;
+		joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j);
+		joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j);
+
+		t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2
+			- 2 * input_abs_get_flat(dev, j);
+		if (t) {
+			joydev->corr[i].coef[2] = (1 << 29) / t;
+			joydev->corr[i].coef[3] = (1 << 29) / t;
+		}
+	}
+
+	joydev->dev.devt = MKDEV(INPUT_MAJOR, minor);
+	joydev->dev.class = &input_class;
+	joydev->dev.parent = &dev->dev;
+	joydev->dev.release = joydev_free;
+	device_initialize(&joydev->dev);
+
+	error = input_register_handle(&joydev->handle);
+	if (error)
+		goto err_free_joydev;
+
+	cdev_init(&joydev->cdev, &joydev_fops);
+
+	error = cdev_device_add(&joydev->cdev, &joydev->dev);
+	if (error)
+		goto err_cleanup_joydev;
+
+	return 0;
+
+ err_cleanup_joydev:
+	joydev_cleanup(joydev);
+	input_unregister_handle(&joydev->handle);
+ err_free_joydev:
+	put_device(&joydev->dev);
+ err_free_minor:
+	input_free_minor(minor);
+	return error;
+}
+
+static void joydev_disconnect(struct input_handle *handle)
+{
+	struct joydev *joydev = handle->private;
+
+	cdev_device_del(&joydev->cdev, &joydev->dev);
+	joydev_cleanup(joydev);
+	input_free_minor(MINOR(joydev->dev.devt));
+	input_unregister_handle(handle);
+	put_device(&joydev->dev);
+}
+
+static const struct input_device_id joydev_ids[] = {
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
+				INPUT_DEVICE_ID_MATCH_ABSBIT,
+		.evbit = { BIT_MASK(EV_ABS) },
+		.absbit = { BIT_MASK(ABS_X) },
+	},
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
+				INPUT_DEVICE_ID_MATCH_ABSBIT,
+		.evbit = { BIT_MASK(EV_ABS) },
+		.absbit = { BIT_MASK(ABS_Z) },
+	},
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
+				INPUT_DEVICE_ID_MATCH_ABSBIT,
+		.evbit = { BIT_MASK(EV_ABS) },
+		.absbit = { BIT_MASK(ABS_WHEEL) },
+	},
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
+				INPUT_DEVICE_ID_MATCH_ABSBIT,
+		.evbit = { BIT_MASK(EV_ABS) },
+		.absbit = { BIT_MASK(ABS_THROTTLE) },
+	},
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
+				INPUT_DEVICE_ID_MATCH_KEYBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+		.keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) },
+	},
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
+				INPUT_DEVICE_ID_MATCH_KEYBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+		.keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) },
+	},
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
+				INPUT_DEVICE_ID_MATCH_KEYBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+		.keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) },
+	},
+	{ }	/* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(input, joydev_ids);
+
+static struct input_handler joydev_handler = {
+	.event		= joydev_event,
+	.match		= joydev_match,
+	.connect	= joydev_connect,
+	.disconnect	= joydev_disconnect,
+	.legacy_minors	= true,
+	.minor		= JOYDEV_MINOR_BASE,
+	.name		= "joydev",
+	.id_table	= joydev_ids,
+};
+
+static int __init joydev_init(void)
+{
+	return input_register_handler(&joydev_handler);
+}
+
+static void __exit joydev_exit(void)
+{
+	input_unregister_handler(&joydev_handler);
+}
+
+module_init(joydev_init);
+module_exit(joydev_exit);