534 lines
14 KiB
C
534 lines
14 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/smp_lock.h>
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#include <linux/device.h>
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#include <linux/devfs_fs_kernel.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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#define MSECS(t) (1000 * ((t) / HZ) + 1000 * ((t) % HZ) / HZ)
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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 list;
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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_list {
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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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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 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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if (value < -32767) return -32767;
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if (value > 32767) return 32767;
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return value;
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}
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static void joydev_event(struct input_handle *handle, 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_list *list;
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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) 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, joydev->corr + event.number);
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if (event.value == joydev->abs[event.number]) 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 = MSECS(jiffies);
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list_for_each_entry(list, &joydev->list, node) {
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memcpy(list->buffer + list->head, &event, sizeof(struct js_event));
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if (list->startup == joydev->nabs + joydev->nkey)
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if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
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list->startup = 0;
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kill_fasync(&list->fasync, SIGIO, POLL_IN);
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}
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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_list *list = file->private_data;
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retval = fasync_helper(fd, file, on, &list->fasync);
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return retval < 0 ? retval : 0;
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}
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static void joydev_free(struct joydev *joydev)
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{
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joydev_table[joydev->minor] = NULL;
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kfree(joydev);
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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_list *list = file->private_data;
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joydev_fasync(-1, file, 0);
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list_del(&list->node);
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if (!--list->joydev->open) {
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if (list->joydev->exist)
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input_close_device(&list->joydev->handle);
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else
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joydev_free(list->joydev);
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}
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kfree(list);
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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_list *list;
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int i = iminor(inode) - JOYDEV_MINOR_BASE;
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if (i >= JOYDEV_MINORS || !joydev_table[i])
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return -ENODEV;
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if (!(list = kmalloc(sizeof(struct joydev_list), GFP_KERNEL)))
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return -ENOMEM;
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memset(list, 0, sizeof(struct joydev_list));
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list->joydev = joydev_table[i];
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list_add_tail(&list->node, &joydev_table[i]->list);
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file->private_data = list;
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if (!list->joydev->open++)
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if (list->joydev->exist)
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input_open_device(&list->joydev->handle);
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return 0;
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}
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static ssize_t joydev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
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{
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return -EINVAL;
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}
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static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
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{
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struct joydev_list *list = file->private_data;
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struct joydev *joydev = list->joydev;
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struct input_dev *input = joydev->handle.dev;
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int retval = 0;
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if (!list->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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struct JS_DATA_TYPE data;
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int i;
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for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
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data.buttons |= 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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if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
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return -EFAULT;
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list->startup = 0;
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list->tail = list->head;
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return sizeof(struct JS_DATA_TYPE);
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}
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if (list->startup == joydev->nabs + joydev->nkey
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&& list->head == list->tail && (file->f_flags & O_NONBLOCK))
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return -EAGAIN;
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retval = wait_event_interruptible(list->joydev->wait,
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!list->joydev->exist ||
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list->startup < joydev->nabs + joydev->nkey ||
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list->head != list->tail);
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if (retval)
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return retval;
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if (!list->joydev->exist)
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return -ENODEV;
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while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
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struct js_event event;
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event.time = MSECS(jiffies);
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if (list->startup < joydev->nkey) {
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event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
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event.number = list->startup;
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event.value = !!test_bit(joydev->keypam[event.number], 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 = list->startup - joydev->nkey;
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event.value = joydev->abs[event.number];
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}
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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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list->startup++;
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retval += sizeof(struct js_event);
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}
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while (list->head != list->tail && retval + sizeof(struct js_event) <= count) {
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if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event)))
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return -EFAULT;
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list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
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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_list *list = file->private_data;
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poll_wait(file, &list->joydev->wait, wait);
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return ((list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey) ?
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(POLLIN | POLLRDNORM) : 0) | (list->joydev->exist ? 0 : (POLLHUP | POLLERR));
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}
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static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct joydev_list *list = file->private_data;
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struct joydev *joydev = list->joydev;
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struct input_dev *dev = joydev->handle.dev;
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void __user *argp = (void __user *)arg;
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int i, j;
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if (!joydev->exist) return -ENODEV;
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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(struct JS_DATA_TYPE)) ? -EFAULT : 0;
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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(struct JS_DATA_TYPE)) ? -EFAULT : 0;
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case JS_SET_TIMEOUT:
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return get_user(joydev->glue.JS_TIMEOUT, (int __user *) arg);
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case JS_GET_TIMEOUT:
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return put_user(joydev->glue.JS_TIMEOUT, (int __user *) arg);
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case JS_SET_TIMELIMIT:
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return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
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case JS_GET_TIMELIMIT:
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return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
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case JS_SET_ALL:
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return copy_from_user(&joydev->glue, argp,
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sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0;
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case JS_GET_ALL:
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return copy_to_user(argp, &joydev->glue,
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sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0;
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case JSIOCGVERSION:
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return put_user(JS_VERSION, (__u32 __user *) arg);
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case JSIOCGAXES:
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return put_user(joydev->nabs, (__u8 __user *) arg);
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case JSIOCGBUTTONS:
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return put_user(joydev->nkey, (__u8 __user *) arg);
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case JSIOCSCORR:
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if (copy_from_user(joydev->corr, argp,
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sizeof(struct js_corr) * joydev->nabs))
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return -EFAULT;
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for (i = 0; i < joydev->nabs; i++) {
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j = joydev->abspam[i];
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joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
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}
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return 0;
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case JSIOCGCORR:
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return copy_to_user(argp, joydev->corr,
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sizeof(struct js_corr) * joydev->nabs) ? -EFAULT : 0;
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case JSIOCSAXMAP:
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if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
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return -EFAULT;
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for (i = 0; i < joydev->nabs; i++) {
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if (joydev->abspam[i] > ABS_MAX) return -EINVAL;
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joydev->absmap[joydev->abspam[i]] = i;
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}
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return 0;
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case JSIOCGAXMAP:
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return copy_to_user(argp, joydev->abspam,
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sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
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case JSIOCSBTNMAP:
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if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
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return -EFAULT;
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for (i = 0; i < joydev->nkey; i++) {
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if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) return -EINVAL;
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joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
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}
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return 0;
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case JSIOCGBTNMAP:
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return copy_to_user(argp, joydev->keypam,
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sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
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default:
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if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
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int len;
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if (!dev->name) return 0;
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len = strlen(dev->name) + 1;
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if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
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if (copy_to_user(argp, dev->name, len)) return -EFAULT;
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return len;
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}
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}
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return -EINVAL;
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}
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static struct file_operations joydev_fops = {
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.owner = THIS_MODULE,
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.read = joydev_read,
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.write = joydev_write,
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.poll = joydev_poll,
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.open = joydev_open,
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.release = joydev_release,
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.ioctl = joydev_ioctl,
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.fasync = joydev_fasync,
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};
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static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
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{
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struct joydev *joydev;
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int i, j, t, minor;
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for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
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if (minor == JOYDEV_MINORS) {
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printk(KERN_ERR "joydev: no more free joydev devices\n");
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return NULL;
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}
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if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL)))
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return NULL;
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memset(joydev, 0, sizeof(struct joydev));
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INIT_LIST_HEAD(&joydev->list);
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init_waitqueue_head(&joydev->wait);
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joydev->minor = minor;
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joydev->exist = 1;
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joydev->handle.dev = dev;
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joydev->handle.name = joydev->name;
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joydev->handle.handler = handler;
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joydev->handle.private = joydev;
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sprintf(joydev->name, "js%d", minor);
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for (i = 0; i < ABS_MAX + 1; i++)
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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 + 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 < 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];
|
||
|
if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
|
||
|
continue;
|
||
|
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);
|
||
|
}
|
||
|
|
||
|
joydev_table[minor] = joydev;
|
||
|
|
||
|
devfs_mk_cdev(MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
|
||
|
S_IFCHR|S_IRUGO|S_IWUSR, "input/js%d", minor);
|
||
|
class_simple_device_add(input_class,
|
||
|
MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
|
||
|
dev->dev, "js%d", minor);
|
||
|
|
||
|
return &joydev->handle;
|
||
|
}
|
||
|
|
||
|
static void joydev_disconnect(struct input_handle *handle)
|
||
|
{
|
||
|
struct joydev *joydev = handle->private;
|
||
|
struct joydev_list *list;
|
||
|
|
||
|
class_simple_device_remove(MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
|
||
|
devfs_remove("input/js%d", joydev->minor);
|
||
|
joydev->exist = 0;
|
||
|
|
||
|
if (joydev->open) {
|
||
|
input_close_device(handle);
|
||
|
wake_up_interruptible(&joydev->wait);
|
||
|
list_for_each_entry(list, &joydev->list, node)
|
||
|
kill_fasync(&list->fasync, SIGIO, POLL_HUP);
|
||
|
} else
|
||
|
joydev_free(joydev);
|
||
|
}
|
||
|
|
||
|
static struct input_device_id joydev_blacklist[] = {
|
||
|
{
|
||
|
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
|
||
|
.evbit = { BIT(EV_KEY) },
|
||
|
.keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
|
||
|
}, /* Avoid itouchpads, touchscreens and tablets */
|
||
|
{ }, /* Terminating entry */
|
||
|
};
|
||
|
|
||
|
static struct input_device_id joydev_ids[] = {
|
||
|
{
|
||
|
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
|
||
|
.evbit = { BIT(EV_ABS) },
|
||
|
.absbit = { BIT(ABS_X) },
|
||
|
},
|
||
|
{
|
||
|
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
|
||
|
.evbit = { BIT(EV_ABS) },
|
||
|
.absbit = { BIT(ABS_WHEEL) },
|
||
|
},
|
||
|
{
|
||
|
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
|
||
|
.evbit = { BIT(EV_ABS) },
|
||
|
.absbit = { BIT(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)
|
||
|
{
|
||
|
input_register_handler(&joydev_handler);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void __exit joydev_exit(void)
|
||
|
{
|
||
|
input_unregister_handler(&joydev_handler);
|
||
|
}
|
||
|
|
||
|
module_init(joydev_init);
|
||
|
module_exit(joydev_exit);
|