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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [input/] [uinput.c] - Rev 1275
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/* * User level driver support for input subsystem * * Heavily based on evdev.c by Vojtech Pavlik * * 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 * * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org> * * Changes/Revisions: * 0.1 20/06/2002 * - first public version */ #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> #include <linux/fs.h> #include <linux/miscdevice.h> #include <linux/uinput.h> static int uinput_dev_open(struct input_dev *dev) { return 0; } static void uinput_dev_close(struct input_dev *dev) { } static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) { struct uinput_device *udev; udev = (struct uinput_device *)dev->private; udev->buff[udev->head].type = type; udev->buff[udev->head].code = code; udev->buff[udev->head].value = value; do_gettimeofday(&udev->buff[udev->head].time); udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE; wake_up_interruptible(&udev->waitq); return 0; } static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect) { return 0; } static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id) { return 0; } static int uinput_create_device(struct uinput_device *udev) { if (!udev->dev->name) { printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME); return -EINVAL; } udev->dev->open = uinput_dev_open; udev->dev->close = uinput_dev_close; udev->dev->event = uinput_dev_event; udev->dev->upload_effect = uinput_dev_upload_effect; udev->dev->erase_effect = uinput_dev_erase_effect; udev->dev->private = udev; init_waitqueue_head(&(udev->waitq)); input_register_device(udev->dev); set_bit(UIST_CREATED, &(udev->state)); return 0; } static int uinput_destroy_device(struct uinput_device *udev) { if (!test_bit(UIST_CREATED, &(udev->state))) { printk(KERN_WARNING "%s: create the device first\n", UINPUT_NAME); return -EINVAL; } input_unregister_device(udev->dev); clear_bit(UIST_CREATED, &(udev->state)); return 0; } static int uinput_open(struct inode *inode, struct file *file) { struct uinput_device *newdev; struct input_dev *newinput; newdev = kmalloc(sizeof(struct uinput_device), GFP_KERNEL); if (!newdev) goto error; memset(newdev, 0, sizeof(struct uinput_device)); newinput = kmalloc(sizeof(struct input_dev), GFP_KERNEL); if (!newinput) goto cleanup; memset(newinput, 0, sizeof(struct input_dev)); newdev->dev = newinput; file->private_data = newdev; return 0; cleanup: kfree(newdev); error: return -ENOMEM; } static int uinput_validate_absbits(struct input_dev *dev) { unsigned int cnt; int retval = 0; for (cnt = 0; cnt < ABS_MAX; cnt++) { if (!test_bit(cnt, dev->absbit)) continue; if (/*!dev->absmin[cnt] || !dev->absmax[cnt] || */ (dev->absmax[cnt] <= dev->absmin[cnt])) { printk(KERN_DEBUG "%s: invalid abs[%02x] min:%d max:%d\n", UINPUT_NAME, cnt, dev->absmin[cnt], dev->absmax[cnt]); retval = -EINVAL; break; } if ((dev->absflat[cnt] < dev->absmin[cnt]) || (dev->absflat[cnt] > dev->absmax[cnt])) { printk(KERN_DEBUG "%s: absflat[%02x] out of range: %d " "(min:%d/max:%d)\n", UINPUT_NAME, cnt, dev->absflat[cnt], dev->absmin[cnt], dev->absmax[cnt]); retval = -EINVAL; break; } } return retval; } static int uinput_alloc_device(struct file *file, const char *buffer, size_t count) { struct uinput_user_dev *user_dev; struct input_dev *dev; struct uinput_device *udev; int size, retval; retval = count; udev = (struct uinput_device *)file->private_data; dev = udev->dev; user_dev = kmalloc(sizeof(*user_dev), GFP_KERNEL); if (!user_dev) { retval = -ENOMEM; goto exit; } if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) { retval = -EFAULT; goto exit; } if (NULL != dev->name) kfree(dev->name); size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1; dev->name = kmalloc(size, GFP_KERNEL); if (!dev->name) { retval = -ENOMEM; goto exit; } strncpy(dev->name, user_dev->name, size); dev->idbus = user_dev->idbus; dev->idvendor = user_dev->idvendor; dev->idproduct = user_dev->idproduct; dev->idversion = user_dev->idversion; dev->ff_effects_max = user_dev->ff_effects_max; size = sizeof(int) * (ABS_MAX + 1); memcpy(dev->absmax, user_dev->absmax, size); memcpy(dev->absmin, user_dev->absmin, size); memcpy(dev->absfuzz, user_dev->absfuzz, size); memcpy(dev->absflat, user_dev->absflat, size); /* check if absmin/absmax/absfuzz/absflat are filled as * told in Documentation/input/input-programming.txt */ if (test_bit(EV_ABS, dev->evbit)) { retval = uinput_validate_absbits(dev); if (retval < 0) kfree(dev->name); } exit: kfree(user_dev); return retval; } static ssize_t uinput_write(struct file *file, const char *buffer, size_t count, loff_t *ppos) { struct uinput_device *udev = file->private_data; if (test_bit(UIST_CREATED, &(udev->state))) { struct input_event ev; if (copy_from_user(&ev, buffer, sizeof(struct input_event))) return -EFAULT; input_event(udev->dev, ev.type, ev.code, ev.value); } else count = uinput_alloc_device(file, buffer, count); return count; } static ssize_t uinput_read(struct file *file, char *buffer, size_t count, loff_t *ppos) { struct uinput_device *udev = file->private_data; int retval = 0; if (!test_bit(UIST_CREATED, &(udev->state))) return -ENODEV; if ((udev->head == udev->tail) && (file->f_flags & O_NONBLOCK)) return -EAGAIN; retval = wait_event_interruptible(udev->waitq, (udev->head != udev->tail) || !test_bit(UIST_CREATED, &(udev->state))); if (retval) return retval; if (!test_bit(UIST_CREATED, &(udev->state))) return -ENODEV; while ((udev->head != udev->tail) && (retval + sizeof(struct input_event) <= count)) { if (copy_to_user(buffer + retval, &(udev->buff[udev->tail]), sizeof(struct input_event))) return -EFAULT; udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE; retval += sizeof(struct input_event); } return retval; } static unsigned int uinput_poll(struct file *file, poll_table *wait) { struct uinput_device *udev = file->private_data; poll_wait(file, &udev->waitq, wait); if (udev->head != udev->tail) return POLLIN | POLLRDNORM; return 0; } static int uinput_burn_device(struct uinput_device *udev) { if (test_bit(UIST_CREATED, &(udev->state))) uinput_destroy_device(udev); kfree(udev->dev); kfree(udev); return 0; } static int uinput_close(struct inode *inode, struct file *file) { return uinput_burn_device((struct uinput_device *)file->private_data); } static int uinput_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { int retval = 0; struct uinput_device *udev; udev = (struct uinput_device *)file->private_data; /* device attributes can not be changed after the device is created */ if (cmd >= UI_SET_EVBIT && test_bit(UIST_CREATED, &(udev->state))) return -EINVAL; switch (cmd) { case UI_DEV_CREATE: retval = uinput_create_device(udev); break; case UI_DEV_DESTROY: retval = uinput_destroy_device(udev); break; case UI_SET_EVBIT: if (arg > EV_MAX) { retval = -EINVAL; break; } set_bit(arg, udev->dev->evbit); break; case UI_SET_KEYBIT: if (arg > KEY_MAX) { retval = -EINVAL; break; } set_bit(arg, udev->dev->keybit); break; case UI_SET_RELBIT: if (arg > REL_MAX) { retval = -EINVAL; break; } set_bit(arg, udev->dev->relbit); break; case UI_SET_ABSBIT: if (arg > ABS_MAX) { retval = -EINVAL; break; } set_bit(arg, udev->dev->absbit); break; case UI_SET_MSCBIT: if (arg > MSC_MAX) { retval = -EINVAL; break; } set_bit(arg, udev->dev->mscbit); break; case UI_SET_LEDBIT: if (arg > LED_MAX) { retval = -EINVAL; break; } set_bit(arg, udev->dev->ledbit); break; case UI_SET_SNDBIT: if (arg > SND_MAX) { retval = -EINVAL; break; } set_bit(arg, udev->dev->sndbit); break; case UI_SET_FFBIT: if (arg > FF_MAX) { retval = -EINVAL; break; } set_bit(arg, udev->dev->ffbit); break; default: retval = -EFAULT; } return retval; } struct file_operations uinput_fops = { owner: THIS_MODULE, open: uinput_open, release: uinput_close, read: uinput_read, write: uinput_write, poll: uinput_poll, ioctl: uinput_ioctl, }; static struct miscdevice uinput_misc = { fops: &uinput_fops, minor: UINPUT_MINOR, name: UINPUT_NAME, }; static int __init uinput_init(void) { return misc_register(&uinput_misc); } static void __exit uinput_exit(void) { misc_deregister(&uinput_misc); } MODULE_AUTHOR("Aristeu Sergio Rozanski Filho"); MODULE_DESCRIPTION("User level driver support for input subsystem"); MODULE_LICENSE("GPL"); module_init(uinput_init); module_exit(uinput_exit);
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