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joydev.c
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1070 lines (872 loc) · 25.6 KB
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/*
* Joystick device driver for the input driver suite.
*
* Copyright (c) 1999-2002 Vojtech Pavlik
* Copyright (c) 1999 Colin Van Dyke
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#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 <[email protected]>");
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;
nonseekable_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 < 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;
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 < 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[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);
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.
* 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);
__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))
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[] = {