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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [input/] [evdev.c] - Rev 1275
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/* * $Id: evdev.c,v 1.1.1.1 2004-04-15 02:18:54 phoenix Exp $ * * Copyright (c) 1999-2001 Vojtech Pavlik * * Event char devices, giving access to raw input device events. * * Sponsored by SuSE */ /* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Should you need to contact me, the author, you can do so either by * e-mail - mail your message to <vojtech@suse.cz>, or by paper mail: * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic */ #define EVDEV_MINOR_BASE 64 #define EVDEV_MINORS 32 #define EVDEV_BUFFER_SIZE 64 #include <linux/poll.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/init.h> #include <linux/input.h> #include <linux/smp_lock.h> struct evdev { int exist; int open; int minor; struct input_handle handle; wait_queue_head_t wait; devfs_handle_t devfs; struct evdev_list *list; }; struct evdev_list { struct input_event buffer[EVDEV_BUFFER_SIZE]; int head; int tail; struct fasync_struct *fasync; struct evdev *evdev; struct evdev_list *next; }; static struct evdev *evdev_table[EVDEV_MINORS] = { NULL, /* ... */ }; static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) { struct evdev *evdev = handle->private; struct evdev_list *list = evdev->list; while (list) { do_gettimeofday(&list->buffer[list->head].time); list->buffer[list->head].type = type; list->buffer[list->head].code = code; list->buffer[list->head].value = value; list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1); kill_fasync(&list->fasync, SIGIO, POLL_IN); list = list->next; } wake_up_interruptible(&evdev->wait); } static int evdev_fasync(int fd, struct file *file, int on) { int retval; struct evdev_list *list = file->private_data; retval = fasync_helper(fd, file, on, &list->fasync); return retval < 0 ? retval : 0; } static int evdev_release(struct inode * inode, struct file * file) { struct evdev_list *list = file->private_data; struct evdev_list **listptr; lock_kernel(); listptr = &list->evdev->list; evdev_fasync(-1, file, 0); while (*listptr && (*listptr != list)) listptr = &((*listptr)->next); *listptr = (*listptr)->next; if (!--list->evdev->open) { if (list->evdev->exist) { input_close_device(&list->evdev->handle); } else { input_unregister_minor(list->evdev->devfs); evdev_table[list->evdev->minor] = NULL; kfree(list->evdev); } } kfree(list); unlock_kernel(); return 0; } static int evdev_open(struct inode * inode, struct file * file) { struct evdev_list *list; int i = MINOR(inode->i_rdev) - EVDEV_MINOR_BASE; if (i >= EVDEV_MINORS || !evdev_table[i]) return -ENODEV; if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL))) return -ENOMEM; memset(list, 0, sizeof(struct evdev_list)); list->evdev = evdev_table[i]; list->next = evdev_table[i]->list; evdev_table[i]->list = list; file->private_data = list; if (!list->evdev->open++) if (list->evdev->exist) input_open_device(&list->evdev->handle); return 0; } static ssize_t evdev_write(struct file * file, const char * buffer, size_t count, loff_t *ppos) { struct evdev_list *list = file->private_data; struct input_event event; int retval = 0; while (retval < count) { if (copy_from_user(&event, buffer + retval, sizeof(struct input_event))) return -EFAULT; input_event(list->evdev->handle.dev, event.type, event.code, event.value); retval += sizeof(struct input_event); } return retval; } static ssize_t evdev_read(struct file * file, char * buffer, size_t count, loff_t *ppos) { DECLARE_WAITQUEUE(wait, current); struct evdev_list *list = file->private_data; int retval = 0; if (list->head == list->tail) { add_wait_queue(&list->evdev->wait, &wait); current->state = TASK_INTERRUPTIBLE; while (list->head == list->tail) { if (!list->evdev->exist) { retval = -ENODEV; break; } if (file->f_flags & O_NONBLOCK) { retval = -EAGAIN; break; } if (signal_pending(current)) { retval = -ERESTARTSYS; break; } schedule(); } current->state = TASK_RUNNING; remove_wait_queue(&list->evdev->wait, &wait); } if (retval) return retval; while (list->head != list->tail && retval + sizeof(struct input_event) <= count) { if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct input_event))) return -EFAULT; list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1); retval += sizeof(struct input_event); } return retval; } /* No kernel lock - fine */ static unsigned int evdev_poll(struct file *file, poll_table *wait) { struct evdev_list *list = file->private_data; poll_wait(file, &list->evdev->wait, wait); if (list->head != list->tail) return POLLIN | POLLRDNORM; return 0; } static int evdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { struct evdev_list *list = file->private_data; struct evdev *evdev = list->evdev; struct input_dev *dev = evdev->handle.dev; int retval; if (!evdev->exist) return -ENODEV; switch (cmd) { case EVIOCGVERSION: return put_user(EV_VERSION, (int *) arg); case EVIOCGID: if ((retval = put_user(dev->idbus, ((short *) arg) + 0))) return retval; if ((retval = put_user(dev->idvendor, ((short *) arg) + 1))) return retval; if ((retval = put_user(dev->idproduct, ((short *) arg) + 2))) return retval; if ((retval = put_user(dev->idversion, ((short *) arg) + 3))) return retval; return 0; case EVIOCSFF: if (dev->upload_effect) { struct ff_effect effect; int err; if (copy_from_user((void*)(&effect), (void*)arg, sizeof(effect))) { return -EINVAL; } err = dev->upload_effect(dev, &effect); if (put_user(effect.id, &(((struct ff_effect*)arg)->id))) { return -EINVAL; } return err; } else return -ENOSYS; case EVIOCRMFF: if (dev->erase_effect) { return dev->erase_effect(dev, (int)arg); } else return -ENOSYS; case EVIOCGEFFECTS: put_user(dev->ff_effects_max, (int*) arg); return 0; default: if (_IOC_TYPE(cmd) != 'E' || _IOC_DIR(cmd) != _IOC_READ) return -EINVAL; if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { long *bits; int len; switch (_IOC_NR(cmd) & EV_MAX) { case 0: bits = dev->evbit; len = EV_MAX; break; case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; case EV_REL: bits = dev->relbit; len = REL_MAX; break; case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; case EV_LED: bits = dev->ledbit; len = LED_MAX; break; case EV_SND: bits = dev->sndbit; len = SND_MAX; break; case EV_FF: bits = dev->ffbit; len = FF_MAX; break; default: return -EINVAL; } len = NBITS(len) * sizeof(long); if (len > _IOC_SIZE(cmd)) { printk(KERN_WARNING "evdev.c: Truncating bitfield length from %d to %d\n", len, _IOC_SIZE(cmd)); len = _IOC_SIZE(cmd); } return copy_to_user((char *) arg, bits, len) ? -EFAULT : len; } if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) { int len; if (!dev->name) return 0; len = strlen(dev->name) + 1; if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); return copy_to_user((char *) arg, dev->name, len) ? -EFAULT : len; } if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { int t = _IOC_NR(cmd) & ABS_MAX; if ((retval = put_user(dev->abs[t], ((int *) arg) + 0))) return retval; if ((retval = put_user(dev->absmin[t], ((int *) arg) + 1))) return retval; if ((retval = put_user(dev->absmax[t], ((int *) arg) + 2))) return retval; if ((retval = put_user(dev->absfuzz[t], ((int *) arg) + 3))) return retval; if ((retval = put_user(dev->absflat[t], ((int *) arg) + 4))) return retval; return 0; } } return -EINVAL; } static struct file_operations evdev_fops = { owner: THIS_MODULE, read: evdev_read, write: evdev_write, poll: evdev_poll, open: evdev_open, release: evdev_release, ioctl: evdev_ioctl, fasync: evdev_fasync, }; static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev) { struct evdev *evdev; 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 = kmalloc(sizeof(struct evdev), GFP_KERNEL))) return NULL; memset(evdev, 0, sizeof(struct evdev)); init_waitqueue_head(&evdev->wait); evdev->minor = minor; evdev_table[minor] = evdev; evdev->handle.dev = dev; evdev->handle.handler = handler; evdev->handle.private = evdev; evdev->exist = 1; evdev->devfs = input_register_minor("event%d", minor, EVDEV_MINOR_BASE); // printk(KERN_INFO "event%d: Event device for input%d\n", minor, dev->number); return &evdev->handle; } static void evdev_disconnect(struct input_handle *handle) { struct evdev *evdev = handle->private; evdev->exist = 0; if (evdev->open) { input_close_device(handle); wake_up_interruptible(&evdev->wait); } else { input_unregister_minor(evdev->devfs); evdev_table[evdev->minor] = NULL; kfree(evdev); } } static struct input_handler evdev_handler = { event: evdev_event, connect: evdev_connect, disconnect: evdev_disconnect, fops: &evdev_fops, minor: EVDEV_MINOR_BASE, }; 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@suse.cz>"); MODULE_DESCRIPTION("Event character device driver"); MODULE_LICENSE("GPL");
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