| /* |
| * 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 __user *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; |
| } |
| |
| strlcpy(dev->name, user_dev->name, size); |
| dev->id.bustype = user_dev->id.bustype; |
| dev->id.vendor = user_dev->id.vendor; |
| dev->id.product = user_dev->id.product; |
| dev->id.version = user_dev->id.version; |
| 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 __user *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 __user *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; |
| |
| if (!test_bit(UIST_CREATED, &(udev->state))) |
| return 0; |
| |
| 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); |
| |