714 lines
17 KiB
C
714 lines
17 KiB
C
/*
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* Event char devices, giving access to raw input device events.
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*
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* Copyright (c) 1999-2002 Vojtech Pavlik
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#define EVDEV_MINOR_BASE 64
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#define EVDEV_MINORS 32
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#define EVDEV_BUFFER_SIZE 64
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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/major.h>
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#include <linux/smp_lock.h>
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#include <linux/device.h>
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#include <linux/compat.h>
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struct evdev {
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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 evdev_list *grab;
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struct list_head list;
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};
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struct evdev_list {
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struct input_event buffer[EVDEV_BUFFER_SIZE];
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int head;
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int tail;
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struct fasync_struct *fasync;
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struct evdev *evdev;
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struct list_head node;
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};
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static struct evdev *evdev_table[EVDEV_MINORS];
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static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
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{
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struct evdev *evdev = handle->private;
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struct evdev_list *list;
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if (evdev->grab) {
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list = evdev->grab;
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do_gettimeofday(&list->buffer[list->head].time);
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list->buffer[list->head].type = type;
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list->buffer[list->head].code = code;
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list->buffer[list->head].value = value;
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list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
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kill_fasync(&list->fasync, SIGIO, POLL_IN);
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} else
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list_for_each_entry(list, &evdev->list, node) {
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do_gettimeofday(&list->buffer[list->head].time);
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list->buffer[list->head].type = type;
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list->buffer[list->head].code = code;
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list->buffer[list->head].value = value;
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list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
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kill_fasync(&list->fasync, SIGIO, POLL_IN);
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}
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wake_up_interruptible(&evdev->wait);
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}
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static int evdev_fasync(int fd, struct file *file, int on)
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{
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int retval;
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struct evdev_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 int evdev_flush(struct file *file, fl_owner_t id)
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{
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struct evdev_list *list = file->private_data;
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if (!list->evdev->exist)
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return -ENODEV;
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return input_flush_device(&list->evdev->handle, file);
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}
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static void evdev_free(struct evdev *evdev)
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{
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evdev_table[evdev->minor] = NULL;
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kfree(evdev);
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}
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static int evdev_release(struct inode * inode, struct file * file)
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{
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struct evdev_list *list = file->private_data;
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if (list->evdev->grab == list) {
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input_release_device(&list->evdev->handle);
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list->evdev->grab = NULL;
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}
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evdev_fasync(-1, file, 0);
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list_del(&list->node);
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if (!--list->evdev->open) {
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if (list->evdev->exist)
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input_close_device(&list->evdev->handle);
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else
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evdev_free(list->evdev);
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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 evdev_open(struct inode * inode, struct file * file)
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{
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struct evdev_list *list;
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int i = iminor(inode) - EVDEV_MINOR_BASE;
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if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist)
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return -ENODEV;
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if (!(list = kzalloc(sizeof(struct evdev_list), GFP_KERNEL)))
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return -ENOMEM;
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list->evdev = evdev_table[i];
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list_add_tail(&list->node, &evdev_table[i]->list);
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file->private_data = list;
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if (!list->evdev->open++)
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if (list->evdev->exist)
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input_open_device(&list->evdev->handle);
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return 0;
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}
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#ifdef CONFIG_COMPAT
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struct input_event_compat {
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struct compat_timeval time;
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__u16 type;
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__u16 code;
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__s32 value;
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};
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/* Note to the author of this code: did it ever occur to
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you why the ifdefs are needed? Think about it again. -AK */
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#ifdef CONFIG_X86_64
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# define COMPAT_TEST is_compat_task()
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#elif defined(CONFIG_IA64)
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# define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current))
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#elif defined(CONFIG_S390)
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# define COMPAT_TEST test_thread_flag(TIF_31BIT)
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#elif defined(CONFIG_MIPS)
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# define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR)
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#else
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# define COMPAT_TEST test_thread_flag(TIF_32BIT)
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#endif
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static inline size_t evdev_event_size(void)
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{
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return COMPAT_TEST ?
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sizeof(struct input_event_compat) : sizeof(struct input_event);
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}
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static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
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{
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if (COMPAT_TEST) {
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struct input_event_compat compat_event;
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if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat)))
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return -EFAULT;
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event->time.tv_sec = compat_event.time.tv_sec;
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event->time.tv_usec = compat_event.time.tv_usec;
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event->type = compat_event.type;
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event->code = compat_event.code;
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event->value = compat_event.value;
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} else {
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if (copy_from_user(event, buffer, sizeof(struct input_event)))
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return -EFAULT;
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}
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return 0;
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}
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static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
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{
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if (COMPAT_TEST) {
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struct input_event_compat compat_event;
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compat_event.time.tv_sec = event->time.tv_sec;
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compat_event.time.tv_usec = event->time.tv_usec;
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compat_event.type = event->type;
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compat_event.code = event->code;
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compat_event.value = event->value;
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if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat)))
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return -EFAULT;
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} else {
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if (copy_to_user(buffer, event, sizeof(struct input_event)))
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return -EFAULT;
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}
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return 0;
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}
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#else
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static inline size_t evdev_event_size(void)
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{
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return sizeof(struct input_event);
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}
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static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
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{
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if (copy_from_user(event, buffer, sizeof(struct input_event)))
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return -EFAULT;
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return 0;
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}
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static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
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{
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if (copy_to_user(buffer, event, sizeof(struct input_event)))
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return -EFAULT;
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return 0;
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}
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#endif /* CONFIG_COMPAT */
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static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
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{
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struct evdev_list *list = file->private_data;
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struct input_event event;
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int retval = 0;
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if (!list->evdev->exist)
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return -ENODEV;
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while (retval < count) {
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if (evdev_event_from_user(buffer + retval, &event))
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return -EFAULT;
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input_inject_event(&list->evdev->handle, event.type, event.code, event.value);
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retval += evdev_event_size();
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}
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return retval;
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}
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static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
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{
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struct evdev_list *list = file->private_data;
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int retval;
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if (count < evdev_event_size())
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return -EINVAL;
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if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
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return -EAGAIN;
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retval = wait_event_interruptible(list->evdev->wait,
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list->head != list->tail || (!list->evdev->exist));
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if (retval)
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return retval;
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if (!list->evdev->exist)
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return -ENODEV;
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while (list->head != list->tail && retval + evdev_event_size() <= count) {
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struct input_event *event = (struct input_event *) list->buffer + list->tail;
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if (evdev_event_to_user(buffer + retval, event))
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return -EFAULT;
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list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
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retval += evdev_event_size();
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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 evdev_poll(struct file *file, poll_table *wait)
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{
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struct evdev_list *list = file->private_data;
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poll_wait(file, &list->evdev->wait, wait);
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return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
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(list->evdev->exist ? 0 : (POLLHUP | POLLERR));
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}
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#ifdef CONFIG_COMPAT
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#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
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#define NBITS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
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#ifdef __BIG_ENDIAN
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static int bits_to_user(unsigned long *bits, unsigned int maxbit,
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unsigned int maxlen, void __user *p, int compat)
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{
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int len, i;
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if (compat) {
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len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t);
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if (len < maxlen)
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len = maxlen;
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for (i = 0; i < len / sizeof(compat_long_t); i++)
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if (copy_to_user((compat_long_t __user *) p + i,
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(compat_long_t *) bits +
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i + 1 - ((i % 2) << 1),
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sizeof(compat_long_t)))
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return -EFAULT;
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} else {
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len = NBITS(maxbit) * sizeof(long);
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if (len > maxlen)
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len = maxlen;
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if (copy_to_user(p, bits, len))
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return -EFAULT;
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}
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return len;
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}
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#else
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static int bits_to_user(unsigned long *bits, unsigned int maxbit,
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unsigned int maxlen, void __user *p, int compat)
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{
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int len = compat ?
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NBITS_COMPAT(maxbit) * sizeof(compat_long_t) :
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NBITS(maxbit) * sizeof(long);
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if (len > maxlen)
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len = maxlen;
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return copy_to_user(p, bits, len) ? -EFAULT : len;
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}
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#endif /* __BIG_ENDIAN */
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#else
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static int bits_to_user(unsigned long *bits, unsigned int maxbit,
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unsigned int maxlen, void __user *p, int compat)
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{
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int len = NBITS(maxbit) * sizeof(long);
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if (len > maxlen)
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len = maxlen;
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return copy_to_user(p, bits, len) ? -EFAULT : len;
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}
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#endif /* CONFIG_COMPAT */
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static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
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{
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int len;
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if (!str)
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return -ENOENT;
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len = strlen(str) + 1;
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if (len > maxlen)
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len = maxlen;
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return copy_to_user(p, str, len) ? -EFAULT : len;
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}
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static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
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void __user *p, int compat_mode)
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{
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struct evdev_list *list = file->private_data;
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struct evdev *evdev = list->evdev;
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struct input_dev *dev = evdev->handle.dev;
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struct input_absinfo abs;
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int __user *ip = (int __user *)p;
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int i, t, u, v;
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if (!evdev->exist)
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return -ENODEV;
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switch (cmd) {
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case EVIOCGVERSION:
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return put_user(EV_VERSION, ip);
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case EVIOCGID:
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if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
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return -EFAULT;
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return 0;
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case EVIOCGREP:
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if (!test_bit(EV_REP, dev->evbit))
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return -ENOSYS;
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if (put_user(dev->rep[REP_DELAY], ip))
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return -EFAULT;
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if (put_user(dev->rep[REP_PERIOD], ip + 1))
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return -EFAULT;
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return 0;
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case EVIOCSREP:
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if (!test_bit(EV_REP, dev->evbit))
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return -ENOSYS;
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if (get_user(u, ip))
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return -EFAULT;
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if (get_user(v, ip + 1))
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return -EFAULT;
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input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
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input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
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return 0;
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case EVIOCGKEYCODE:
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if (get_user(t, ip))
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return -EFAULT;
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if (t < 0 || t >= dev->keycodemax || !dev->keycodesize)
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return -EINVAL;
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if (put_user(INPUT_KEYCODE(dev, t), ip + 1))
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return -EFAULT;
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return 0;
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case EVIOCSKEYCODE:
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if (get_user(t, ip))
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return -EFAULT;
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if (t < 0 || t >= dev->keycodemax || !dev->keycodesize)
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return -EINVAL;
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if (get_user(v, ip + 1))
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return -EFAULT;
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if (v < 0 || v > KEY_MAX)
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return -EINVAL;
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if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8)))
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return -EINVAL;
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u = SET_INPUT_KEYCODE(dev, t, v);
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clear_bit(u, dev->keybit);
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set_bit(v, dev->keybit);
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for (i = 0; i < dev->keycodemax; i++)
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if (INPUT_KEYCODE(dev, i) == u)
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set_bit(u, dev->keybit);
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return 0;
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case EVIOCSFF:
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if (dev->upload_effect) {
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struct ff_effect effect;
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int err;
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if (copy_from_user(&effect, p, sizeof(effect)))
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return -EFAULT;
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err = dev->upload_effect(dev, &effect);
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if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
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return -EFAULT;
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return err;
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} else
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return -ENOSYS;
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case EVIOCRMFF:
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if (!dev->erase_effect)
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return -ENOSYS;
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return dev->erase_effect(dev, (int)(unsigned long) p);
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case EVIOCGEFFECTS:
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if (put_user(dev->ff_effects_max, ip))
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return -EFAULT;
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return 0;
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case EVIOCGRAB:
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if (p) {
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if (evdev->grab)
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return -EBUSY;
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if (input_grab_device(&evdev->handle))
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return -EBUSY;
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evdev->grab = list;
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return 0;
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} else {
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if (evdev->grab != list)
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return -EINVAL;
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input_release_device(&evdev->handle);
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evdev->grab = NULL;
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return 0;
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}
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default:
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if (_IOC_TYPE(cmd) != 'E')
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return -EINVAL;
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if (_IOC_DIR(cmd) == _IOC_READ) {
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if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
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long *bits;
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int len;
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switch (_IOC_NR(cmd) & EV_MAX) {
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case 0: bits = dev->evbit; len = EV_MAX; break;
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case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
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case EV_REL: bits = dev->relbit; len = REL_MAX; break;
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case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
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case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
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case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
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case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
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case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
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case EV_SW: bits = dev->swbit; len = SW_MAX; break;
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default: return -EINVAL;
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}
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return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
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}
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if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
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return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
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p, compat_mode);
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if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
|
|
return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
|
|
p, compat_mode);
|
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
|
|
return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
|
|
p, compat_mode);
|
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
|
|
return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
|
|
p, compat_mode);
|
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
|
|
return str_to_user(dev->name, _IOC_SIZE(cmd), p);
|
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
|
|
return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
|
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
|
|
return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
|
|
|
|
if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
|
|
|
|
int t = _IOC_NR(cmd) & ABS_MAX;
|
|
|
|
abs.value = dev->abs[t];
|
|
abs.minimum = dev->absmin[t];
|
|
abs.maximum = dev->absmax[t];
|
|
abs.fuzz = dev->absfuzz[t];
|
|
abs.flat = dev->absflat[t];
|
|
|
|
if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
}
|
|
|
|
if (_IOC_DIR(cmd) == _IOC_WRITE) {
|
|
|
|
if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
|
|
|
|
int t = _IOC_NR(cmd) & ABS_MAX;
|
|
|
|
if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
|
|
return -EFAULT;
|
|
|
|
dev->abs[t] = abs.value;
|
|
dev->absmin[t] = abs.minimum;
|
|
dev->absmax[t] = abs.maximum;
|
|
dev->absfuzz[t] = abs.fuzz;
|
|
dev->absflat[t] = abs.flat;
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
|
|
}
|
|
#endif
|
|
|
|
static struct file_operations evdev_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = evdev_read,
|
|
.write = evdev_write,
|
|
.poll = evdev_poll,
|
|
.open = evdev_open,
|
|
.release = evdev_release,
|
|
.unlocked_ioctl = evdev_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = evdev_ioctl_compat,
|
|
#endif
|
|
.fasync = evdev_fasync,
|
|
.flush = evdev_flush
|
|
};
|
|
|
|
static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
|
|
{
|
|
struct evdev *evdev;
|
|
struct class_device *cdev;
|
|
int minor;
|
|
|
|
for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
|
|
if (minor == EVDEV_MINORS) {
|
|
printk(KERN_ERR "evdev: no more free evdev devices\n");
|
|
return NULL;
|
|
}
|
|
|
|
if (!(evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL)))
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(&evdev->list);
|
|
init_waitqueue_head(&evdev->wait);
|
|
|
|
evdev->exist = 1;
|
|
evdev->minor = minor;
|
|
evdev->handle.dev = dev;
|
|
evdev->handle.name = evdev->name;
|
|
evdev->handle.handler = handler;
|
|
evdev->handle.private = evdev;
|
|
sprintf(evdev->name, "event%d", minor);
|
|
|
|
evdev_table[minor] = evdev;
|
|
|
|
cdev = class_device_create(&input_class, &dev->cdev,
|
|
MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
|
|
dev->cdev.dev, evdev->name);
|
|
|
|
/* temporary symlink to keep userspace happy */
|
|
sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
|
|
evdev->name);
|
|
|
|
return &evdev->handle;
|
|
}
|
|
|
|
static void evdev_disconnect(struct input_handle *handle)
|
|
{
|
|
struct evdev *evdev = handle->private;
|
|
struct evdev_list *list;
|
|
|
|
sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name);
|
|
class_device_destroy(&input_class,
|
|
MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
|
|
evdev->exist = 0;
|
|
|
|
if (evdev->open) {
|
|
input_close_device(handle);
|
|
wake_up_interruptible(&evdev->wait);
|
|
list_for_each_entry(list, &evdev->list, node)
|
|
kill_fasync(&list->fasync, SIGIO, POLL_HUP);
|
|
} else
|
|
evdev_free(evdev);
|
|
}
|
|
|
|
static struct input_device_id evdev_ids[] = {
|
|
{ .driver_info = 1 }, /* Matches all devices */
|
|
{ }, /* Terminating zero entry */
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(input, evdev_ids);
|
|
|
|
static struct input_handler evdev_handler = {
|
|
.event = evdev_event,
|
|
.connect = evdev_connect,
|
|
.disconnect = evdev_disconnect,
|
|
.fops = &evdev_fops,
|
|
.minor = EVDEV_MINOR_BASE,
|
|
.name = "evdev",
|
|
.id_table = evdev_ids,
|
|
};
|
|
|
|
static int __init evdev_init(void)
|
|
{
|
|
input_register_handler(&evdev_handler);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit evdev_exit(void)
|
|
{
|
|
input_unregister_handler(&evdev_handler);
|
|
}
|
|
|
|
module_init(evdev_init);
|
|
module_exit(evdev_exit);
|
|
|
|
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
|
|
MODULE_DESCRIPTION("Input driver event char devices");
|
|
MODULE_LICENSE("GPL");
|