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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Al Viro](/assets/img/avatar_default.png)
As it is, all instances of ->release() for files that have ->fasync() need to remember to evict file from fasync lists; forgetting that creates a hole and we actually have a bunch that *does* forget. So let's keep our lives simple - let __fput() check FASYNC in file->f_flags and call ->fasync() there if it's been set. And lose that crap in ->release() instances - leaving it there is still valid, but we don't have to bother anymore. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
899 lines
21 KiB
C
899 lines
21 KiB
C
/*
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* Joystick device driver for the input driver suite.
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*
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* Copyright (c) 1999-2002 Vojtech Pavlik
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* Copyright (c) 1999 Colin Van Dyke
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <asm/io.h>
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#include <asm/system.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/joystick.h>
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#include <linux/input.h>
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#include <linux/kernel.h>
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#include <linux/major.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/poll.h>
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#include <linux/init.h>
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#include <linux/device.h>
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION("Joystick device interfaces");
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MODULE_SUPPORTED_DEVICE("input/js");
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MODULE_LICENSE("GPL");
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#define JOYDEV_MINOR_BASE 0
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#define JOYDEV_MINORS 16
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#define JOYDEV_BUFFER_SIZE 64
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struct joydev {
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int exist;
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int open;
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int minor;
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char name[16];
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struct input_handle handle;
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wait_queue_head_t wait;
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struct list_head client_list;
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spinlock_t client_lock; /* protects client_list */
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struct mutex mutex;
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struct device dev;
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struct js_corr corr[ABS_MAX + 1];
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struct JS_DATA_SAVE_TYPE glue;
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int nabs;
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int nkey;
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__u16 keymap[KEY_MAX - BTN_MISC + 1];
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__u16 keypam[KEY_MAX - BTN_MISC + 1];
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__u8 absmap[ABS_MAX + 1];
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__u8 abspam[ABS_MAX + 1];
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__s16 abs[ABS_MAX + 1];
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};
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struct joydev_client {
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struct js_event buffer[JOYDEV_BUFFER_SIZE];
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int head;
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int tail;
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int startup;
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spinlock_t buffer_lock; /* protects access to buffer, head and tail */
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struct fasync_struct *fasync;
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struct joydev *joydev;
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struct list_head node;
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};
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static struct joydev *joydev_table[JOYDEV_MINORS];
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static DEFINE_MUTEX(joydev_table_mutex);
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static int joydev_correct(int value, struct js_corr *corr)
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{
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switch (corr->type) {
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case JS_CORR_NONE:
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break;
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case JS_CORR_BROKEN:
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value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
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((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
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((corr->coef[2] * (value - corr->coef[0])) >> 14);
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break;
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default:
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return 0;
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}
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return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
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}
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static void joydev_pass_event(struct joydev_client *client,
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struct js_event *event)
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{
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struct joydev *joydev = client->joydev;
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/*
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* IRQs already disabled, just acquire the lock
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*/
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spin_lock(&client->buffer_lock);
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client->buffer[client->head] = *event;
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if (client->startup == joydev->nabs + joydev->nkey) {
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client->head++;
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client->head &= JOYDEV_BUFFER_SIZE - 1;
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if (client->tail == client->head)
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client->startup = 0;
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}
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spin_unlock(&client->buffer_lock);
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kill_fasync(&client->fasync, SIGIO, POLL_IN);
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}
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static void joydev_event(struct input_handle *handle,
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unsigned int type, unsigned int code, int value)
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{
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struct joydev *joydev = handle->private;
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struct joydev_client *client;
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struct js_event event;
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switch (type) {
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case EV_KEY:
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if (code < BTN_MISC || value == 2)
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return;
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event.type = JS_EVENT_BUTTON;
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event.number = joydev->keymap[code - BTN_MISC];
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event.value = value;
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break;
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case EV_ABS:
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event.type = JS_EVENT_AXIS;
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event.number = joydev->absmap[code];
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event.value = joydev_correct(value,
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&joydev->corr[event.number]);
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if (event.value == joydev->abs[event.number])
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return;
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joydev->abs[event.number] = event.value;
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break;
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default:
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return;
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}
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event.time = jiffies_to_msecs(jiffies);
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rcu_read_lock();
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list_for_each_entry_rcu(client, &joydev->client_list, node)
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joydev_pass_event(client, &event);
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rcu_read_unlock();
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wake_up_interruptible(&joydev->wait);
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}
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static int joydev_fasync(int fd, struct file *file, int on)
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{
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int retval;
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struct joydev_client *client = file->private_data;
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retval = fasync_helper(fd, file, on, &client->fasync);
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return retval < 0 ? retval : 0;
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}
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static void joydev_free(struct device *dev)
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{
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struct joydev *joydev = container_of(dev, struct joydev, dev);
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input_put_device(joydev->handle.dev);
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kfree(joydev);
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}
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static void joydev_attach_client(struct joydev *joydev,
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struct joydev_client *client)
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{
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spin_lock(&joydev->client_lock);
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list_add_tail_rcu(&client->node, &joydev->client_list);
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spin_unlock(&joydev->client_lock);
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synchronize_rcu();
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}
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static void joydev_detach_client(struct joydev *joydev,
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struct joydev_client *client)
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{
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spin_lock(&joydev->client_lock);
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list_del_rcu(&client->node);
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spin_unlock(&joydev->client_lock);
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synchronize_rcu();
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}
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static int joydev_open_device(struct joydev *joydev)
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{
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int retval;
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retval = mutex_lock_interruptible(&joydev->mutex);
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if (retval)
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return retval;
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if (!joydev->exist)
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retval = -ENODEV;
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else if (!joydev->open++) {
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retval = input_open_device(&joydev->handle);
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if (retval)
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joydev->open--;
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}
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mutex_unlock(&joydev->mutex);
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return retval;
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}
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static void joydev_close_device(struct joydev *joydev)
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{
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mutex_lock(&joydev->mutex);
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if (joydev->exist && !--joydev->open)
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input_close_device(&joydev->handle);
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mutex_unlock(&joydev->mutex);
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}
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/*
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* Wake up users waiting for IO so they can disconnect from
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* dead device.
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*/
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static void joydev_hangup(struct joydev *joydev)
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{
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struct joydev_client *client;
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spin_lock(&joydev->client_lock);
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list_for_each_entry(client, &joydev->client_list, node)
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kill_fasync(&client->fasync, SIGIO, POLL_HUP);
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spin_unlock(&joydev->client_lock);
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wake_up_interruptible(&joydev->wait);
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}
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static int joydev_release(struct inode *inode, struct file *file)
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{
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struct joydev_client *client = file->private_data;
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struct joydev *joydev = client->joydev;
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joydev_detach_client(joydev, client);
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kfree(client);
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joydev_close_device(joydev);
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put_device(&joydev->dev);
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return 0;
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}
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static int joydev_open(struct inode *inode, struct file *file)
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{
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struct joydev_client *client;
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struct joydev *joydev;
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int i = iminor(inode) - JOYDEV_MINOR_BASE;
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int error;
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if (i >= JOYDEV_MINORS)
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return -ENODEV;
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error = mutex_lock_interruptible(&joydev_table_mutex);
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if (error)
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return error;
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joydev = joydev_table[i];
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if (joydev)
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get_device(&joydev->dev);
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mutex_unlock(&joydev_table_mutex);
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if (!joydev)
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return -ENODEV;
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client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
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if (!client) {
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error = -ENOMEM;
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goto err_put_joydev;
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}
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spin_lock_init(&client->buffer_lock);
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client->joydev = joydev;
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joydev_attach_client(joydev, client);
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error = joydev_open_device(joydev);
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if (error)
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goto err_free_client;
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file->private_data = client;
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return 0;
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err_free_client:
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joydev_detach_client(joydev, client);
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kfree(client);
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err_put_joydev:
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put_device(&joydev->dev);
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return error;
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}
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static int joydev_generate_startup_event(struct joydev_client *client,
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struct input_dev *input,
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struct js_event *event)
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{
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struct joydev *joydev = client->joydev;
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int have_event;
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spin_lock_irq(&client->buffer_lock);
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have_event = client->startup < joydev->nabs + joydev->nkey;
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if (have_event) {
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event->time = jiffies_to_msecs(jiffies);
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if (client->startup < joydev->nkey) {
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event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
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event->number = client->startup;
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event->value = !!test_bit(joydev->keypam[event->number],
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input->key);
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} else {
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event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
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event->number = client->startup - joydev->nkey;
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event->value = joydev->abs[event->number];
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}
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client->startup++;
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}
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spin_unlock_irq(&client->buffer_lock);
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return have_event;
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}
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static int joydev_fetch_next_event(struct joydev_client *client,
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struct js_event *event)
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{
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int have_event;
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spin_lock_irq(&client->buffer_lock);
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have_event = client->head != client->tail;
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if (have_event) {
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*event = client->buffer[client->tail++];
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client->tail &= JOYDEV_BUFFER_SIZE - 1;
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}
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spin_unlock_irq(&client->buffer_lock);
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return have_event;
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}
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/*
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* Old joystick interface
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*/
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static ssize_t joydev_0x_read(struct joydev_client *client,
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struct input_dev *input,
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char __user *buf)
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{
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struct joydev *joydev = client->joydev;
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struct JS_DATA_TYPE data;
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int i;
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spin_lock_irq(&input->event_lock);
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/*
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* Get device state
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*/
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for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
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data.buttons |=
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test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
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data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
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data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
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/*
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* Reset reader's event queue
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*/
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spin_lock(&client->buffer_lock);
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client->startup = 0;
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client->tail = client->head;
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spin_unlock(&client->buffer_lock);
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spin_unlock_irq(&input->event_lock);
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if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
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return -EFAULT;
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return sizeof(struct JS_DATA_TYPE);
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}
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static inline int joydev_data_pending(struct joydev_client *client)
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{
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struct joydev *joydev = client->joydev;
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return client->startup < joydev->nabs + joydev->nkey ||
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client->head != client->tail;
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}
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static ssize_t joydev_read(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct joydev_client *client = file->private_data;
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struct joydev *joydev = client->joydev;
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struct input_dev *input = joydev->handle.dev;
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struct js_event event;
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int retval;
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if (!joydev->exist)
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return -ENODEV;
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if (count < sizeof(struct js_event))
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return -EINVAL;
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if (count == sizeof(struct JS_DATA_TYPE))
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return joydev_0x_read(client, input, buf);
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if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
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return -EAGAIN;
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retval = wait_event_interruptible(joydev->wait,
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!joydev->exist || joydev_data_pending(client));
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if (retval)
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return retval;
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if (!joydev->exist)
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return -ENODEV;
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while (retval + sizeof(struct js_event) <= count &&
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joydev_generate_startup_event(client, input, &event)) {
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if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
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return -EFAULT;
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retval += sizeof(struct js_event);
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}
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while (retval + sizeof(struct js_event) <= count &&
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joydev_fetch_next_event(client, &event)) {
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if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
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return -EFAULT;
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retval += sizeof(struct js_event);
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}
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return retval;
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}
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/* No kernel lock - fine */
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static unsigned int joydev_poll(struct file *file, poll_table *wait)
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{
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struct joydev_client *client = file->private_data;
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struct joydev *joydev = client->joydev;
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poll_wait(file, &joydev->wait, wait);
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return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) |
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(joydev->exist ? 0 : (POLLHUP | POLLERR));
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}
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|
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static int joydev_ioctl_common(struct joydev *joydev,
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unsigned int cmd, void __user *argp)
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{
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struct input_dev *dev = joydev->handle.dev;
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int i, j;
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switch (cmd) {
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case JS_SET_CAL:
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return copy_from_user(&joydev->glue.JS_CORR, argp,
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sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
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|
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case JS_GET_CAL:
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return copy_to_user(argp, &joydev->glue.JS_CORR,
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sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
|
|
|
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case JS_SET_TIMEOUT:
|
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return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
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|
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case JS_GET_TIMEOUT:
|
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return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
|
|
|
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case JSIOCGVERSION:
|
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return put_user(JS_VERSION, (__u32 __user *) argp);
|
|
|
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case JSIOCGAXES:
|
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return put_user(joydev->nabs, (__u8 __user *) argp);
|
|
|
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case JSIOCGBUTTONS:
|
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return put_user(joydev->nkey, (__u8 __user *) argp);
|
|
|
|
case JSIOCSCORR:
|
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if (copy_from_user(joydev->corr, argp,
|
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sizeof(joydev->corr[0]) * joydev->nabs))
|
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return -EFAULT;
|
|
|
|
for (i = 0; i < joydev->nabs; i++) {
|
|
j = joydev->abspam[i];
|
|
joydev->abs[i] = joydev_correct(dev->abs[j],
|
|
&joydev->corr[i]);
|
|
}
|
|
return 0;
|
|
|
|
case JSIOCGCORR:
|
|
return copy_to_user(argp, joydev->corr,
|
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sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
|
|
|
|
case JSIOCSAXMAP:
|
|
if (copy_from_user(joydev->abspam, argp,
|
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sizeof(__u8) * (ABS_MAX + 1)))
|
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return -EFAULT;
|
|
|
|
for (i = 0; i < joydev->nabs; i++) {
|
|
if (joydev->abspam[i] > ABS_MAX)
|
|
return -EINVAL;
|
|
joydev->absmap[joydev->abspam[i]] = i;
|
|
}
|
|
return 0;
|
|
|
|
case JSIOCGAXMAP:
|
|
return copy_to_user(argp, joydev->abspam,
|
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sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
|
|
|
|
case JSIOCSBTNMAP:
|
|
if (copy_from_user(joydev->keypam, argp,
|
|
sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
|
|
return -EFAULT;
|
|
|
|
for (i = 0; i < joydev->nkey; i++) {
|
|
if (joydev->keypam[i] > KEY_MAX ||
|
|
joydev->keypam[i] < BTN_MISC)
|
|
return -EINVAL;
|
|
joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
|
|
}
|
|
|
|
return 0;
|
|
|
|
case JSIOCGBTNMAP:
|
|
return copy_to_user(argp, joydev->keypam,
|
|
sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
|
|
|
|
default:
|
|
if ((cmd & ~IOCSIZE_MASK) == JSIOCGNAME(0)) {
|
|
int len;
|
|
if (!dev->name)
|
|
return 0;
|
|
len = strlen(dev->name) + 1;
|
|
if (len > _IOC_SIZE(cmd))
|
|
len = _IOC_SIZE(cmd);
|
|
if (copy_to_user(argp, dev->name, len))
|
|
return -EFAULT;
|
|
return 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,
|
|
};
|
|
|
|
static int joydev_install_chrdev(struct joydev *joydev)
|
|
{
|
|
joydev_table[joydev->minor] = joydev;
|
|
return 0;
|
|
}
|
|
|
|
static void joydev_remove_chrdev(struct joydev *joydev)
|
|
{
|
|
mutex_lock(&joydev_table_mutex);
|
|
joydev_table[joydev->minor] = NULL;
|
|
mutex_unlock(&joydev_table_mutex);
|
|
}
|
|
|
|
/*
|
|
* Mark device non-existant. 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 = 0;
|
|
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_remove_chrdev(joydev);
|
|
|
|
/* joydev is marked dead so noone else accesses joydev->open */
|
|
if (joydev->open)
|
|
input_close_device(handle);
|
|
}
|
|
|
|
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;
|
|
int error;
|
|
|
|
for (minor = 0; minor < JOYDEV_MINORS; minor++)
|
|
if (!joydev_table[minor])
|
|
break;
|
|
|
|
if (minor == JOYDEV_MINORS) {
|
|
printk(KERN_ERR "joydev: no more free joydev devices\n");
|
|
return -ENFILE;
|
|
}
|
|
|
|
joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
|
|
if (!joydev)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&joydev->client_list);
|
|
spin_lock_init(&joydev->client_lock);
|
|
mutex_init(&joydev->mutex);
|
|
init_waitqueue_head(&joydev->wait);
|
|
|
|
snprintf(joydev->name, sizeof(joydev->name), "js%d", minor);
|
|
joydev->exist = 1;
|
|
joydev->minor = minor;
|
|
|
|
joydev->exist = 1;
|
|
joydev->handle.dev = input_get_device(dev);
|
|
joydev->handle.name = joydev->name;
|
|
joydev->handle.handler = handler;
|
|
joydev->handle.private = joydev;
|
|
|
|
for (i = 0; i < ABS_MAX + 1; i++)
|
|
if (test_bit(i, dev->absbit)) {
|
|
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 (dev->absmax[j] == dev->absmin[j]) {
|
|
joydev->corr[i].type = JS_CORR_NONE;
|
|
joydev->abs[i] = dev->abs[j];
|
|
continue;
|
|
}
|
|
joydev->corr[i].type = JS_CORR_BROKEN;
|
|
joydev->corr[i].prec = dev->absfuzz[j];
|
|
joydev->corr[i].coef[0] =
|
|
(dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
|
|
joydev->corr[i].coef[1] =
|
|
(dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
|
|
|
|
t = (dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j];
|
|
if (t) {
|
|
joydev->corr[i].coef[2] = (1 << 29) / t;
|
|
joydev->corr[i].coef[3] = (1 << 29) / t;
|
|
|
|
joydev->abs[i] = joydev_correct(dev->abs[j],
|
|
joydev->corr + i);
|
|
}
|
|
}
|
|
|
|
strlcpy(joydev->dev.bus_id, joydev->name, sizeof(joydev->dev.bus_id));
|
|
joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + 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;
|
|
|
|
error = joydev_install_chrdev(joydev);
|
|
if (error)
|
|
goto err_unregister_handle;
|
|
|
|
error = device_add(&joydev->dev);
|
|
if (error)
|
|
goto err_cleanup_joydev;
|
|
|
|
return 0;
|
|
|
|
err_cleanup_joydev:
|
|
joydev_cleanup(joydev);
|
|
err_unregister_handle:
|
|
input_unregister_handle(&joydev->handle);
|
|
err_free_joydev:
|
|
put_device(&joydev->dev);
|
|
return error;
|
|
}
|
|
|
|
static void joydev_disconnect(struct input_handle *handle)
|
|
{
|
|
struct joydev *joydev = handle->private;
|
|
|
|
device_del(&joydev->dev);
|
|
joydev_cleanup(joydev);
|
|
input_unregister_handle(handle);
|
|
put_device(&joydev->dev);
|
|
}
|
|
|
|
static const struct input_device_id joydev_blacklist[] = {
|
|
{
|
|
.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 itouchpads, touchscreens and tablets */
|
|
{ } /* Terminating entry */
|
|
};
|
|
|
|
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_WHEEL) },
|
|
},
|
|
{
|
|
.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
|
|
INPUT_DEVICE_ID_MATCH_ABSBIT,
|
|
.evbit = { BIT_MASK(EV_ABS) },
|
|
.absbit = { BIT_MASK(ABS_THROTTLE) },
|
|
},
|
|
{ } /* Terminating entry */
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(input, joydev_ids);
|
|
|
|
static struct input_handler joydev_handler = {
|
|
.event = joydev_event,
|
|
.connect = joydev_connect,
|
|
.disconnect = joydev_disconnect,
|
|
.fops = &joydev_fops,
|
|
.minor = JOYDEV_MINOR_BASE,
|
|
.name = "joydev",
|
|
.id_table = joydev_ids,
|
|
.blacklist = joydev_blacklist,
|
|
};
|
|
|
|
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);
|