From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- drivers/input/misc/uinput.c | 620 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 620 insertions(+) create mode 100644 drivers/input/misc/uinput.c (limited to 'drivers/input/misc/uinput.c') diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c new file mode 100644 index 00000000000..158c8e845ff --- /dev/null +++ b/drivers/input/misc/uinput.c @@ -0,0 +1,620 @@ +/* + * 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 + * + * Changes/Revisions: + * 0.2 16/10/2004 (Micah Dowty ) + * - added force feedback support + * - added UI_SET_PHYS + * 0.1 20/06/2002 + * - first public version + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +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 = 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_request_alloc_id(struct input_dev *dev, struct uinput_request *request) +{ + /* Atomically allocate an ID for the given request. Returns 0 on success. */ + struct uinput_device *udev = dev->private; + int id; + + down(&udev->requests_sem); + for (id=0; idrequests[id]) { + udev->requests[id] = request; + request->id = id; + up(&udev->requests_sem); + return 0; + } + up(&udev->requests_sem); + return -1; +} + +static struct uinput_request* uinput_request_find(struct uinput_device *udev, int id) +{ + /* Find an input request, by ID. Returns NULL if the ID isn't valid. */ + if (id >= UINPUT_NUM_REQUESTS || id < 0) + return NULL; + if (udev->requests[id]->completed) + return NULL; + return udev->requests[id]; +} + +static void uinput_request_init(struct input_dev *dev, struct uinput_request *request, int code) +{ + struct uinput_device *udev = dev->private; + + memset(request, 0, sizeof(struct uinput_request)); + request->code = code; + init_waitqueue_head(&request->waitq); + + /* Allocate an ID. If none are available right away, wait. */ + request->retval = wait_event_interruptible(udev->requests_waitq, + !uinput_request_alloc_id(dev, request)); +} + +static void uinput_request_submit(struct input_dev *dev, struct uinput_request *request) +{ + struct uinput_device *udev = dev->private; + int retval; + + /* Tell our userspace app about this new request by queueing an input event */ + uinput_dev_event(dev, EV_UINPUT, request->code, request->id); + + /* Wait for the request to complete */ + retval = wait_event_interruptible(request->waitq, request->completed); + if (retval) + request->retval = retval; + + /* Release this request's ID, let others know it's available */ + udev->requests[request->id] = NULL; + wake_up_interruptible(&udev->requests_waitq); +} + +static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect) +{ + struct uinput_request request; + + if (!test_bit(EV_FF, dev->evbit)) + return -ENOSYS; + + uinput_request_init(dev, &request, UI_FF_UPLOAD); + if (request.retval) + return request.retval; + request.u.effect = effect; + uinput_request_submit(dev, &request); + return request.retval; +} + +static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id) +{ + struct uinput_request request; + + if (!test_bit(EV_FF, dev->evbit)) + return -ENOSYS; + + uinput_request_init(dev, &request, UI_FF_ERASE); + if (request.retval) + return request.retval; + request.u.effect_id = effect_id; + uinput_request_submit(dev, &request); + return request.retval; +} + +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)); + init_MUTEX(&newdev->requests_sem); + init_waitqueue_head(&newdev->requests_waitq); + + 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 + 1; cnt++) { + if (!test_bit(cnt, dev->absbit)) + continue; + + if ((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->absmax[cnt] - dev->absmin[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 = 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; + + 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); + + if (NULL != udev->dev->name) + kfree(udev->dev->name); + if (NULL != udev->dev->phys) + kfree(udev->dev->phys); + + kfree(udev->dev); + kfree(udev); + + return 0; +} + +static int uinput_close(struct inode *inode, struct file *file) +{ + return uinput_burn_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; + void __user *p = (void __user *)arg; + struct uinput_ff_upload ff_up; + struct uinput_ff_erase ff_erase; + struct uinput_request *req; + int length; + + udev = file->private_data; + + /* device attributes can not be changed after the device is created */ + switch (cmd) { + case UI_SET_EVBIT: + case UI_SET_KEYBIT: + case UI_SET_RELBIT: + case UI_SET_ABSBIT: + case UI_SET_MSCBIT: + case UI_SET_LEDBIT: + case UI_SET_SNDBIT: + case UI_SET_FFBIT: + case UI_SET_PHYS: + if (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; + + case UI_SET_PHYS: + length = strnlen_user(p, 1024); + if (length <= 0) { + retval = -EFAULT; + break; + } + if (NULL != udev->dev->phys) + kfree(udev->dev->phys); + udev->dev->phys = kmalloc(length, GFP_KERNEL); + if (!udev->dev->phys) { + retval = -ENOMEM; + break; + } + if (copy_from_user(udev->dev->phys, p, length)) { + retval = -EFAULT; + kfree(udev->dev->phys); + udev->dev->phys = NULL; + break; + } + udev->dev->phys[length-1] = '\0'; + break; + + case UI_BEGIN_FF_UPLOAD: + if (copy_from_user(&ff_up, p, sizeof(ff_up))) { + retval = -EFAULT; + break; + } + req = uinput_request_find(udev, ff_up.request_id); + if (!(req && req->code==UI_FF_UPLOAD && req->u.effect)) { + retval = -EINVAL; + break; + } + ff_up.retval = 0; + memcpy(&ff_up.effect, req->u.effect, sizeof(struct ff_effect)); + if (copy_to_user(p, &ff_up, sizeof(ff_up))) { + retval = -EFAULT; + break; + } + break; + + case UI_BEGIN_FF_ERASE: + if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { + retval = -EFAULT; + break; + } + req = uinput_request_find(udev, ff_erase.request_id); + if (!(req && req->code==UI_FF_ERASE)) { + retval = -EINVAL; + break; + } + ff_erase.retval = 0; + ff_erase.effect_id = req->u.effect_id; + if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) { + retval = -EFAULT; + break; + } + break; + + case UI_END_FF_UPLOAD: + if (copy_from_user(&ff_up, p, sizeof(ff_up))) { + retval = -EFAULT; + break; + } + req = uinput_request_find(udev, ff_up.request_id); + if (!(req && req->code==UI_FF_UPLOAD && req->u.effect)) { + retval = -EINVAL; + break; + } + req->retval = ff_up.retval; + memcpy(req->u.effect, &ff_up.effect, sizeof(struct ff_effect)); + req->completed = 1; + wake_up_interruptible(&req->waitq); + break; + + case UI_END_FF_ERASE: + if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { + retval = -EFAULT; + break; + } + req = uinput_request_find(udev, ff_erase.request_id); + if (!(req && req->code==UI_FF_ERASE)) { + retval = -EINVAL; + break; + } + req->retval = ff_erase.retval; + req->completed = 1; + wake_up_interruptible(&req->waitq); + break; + + default: + retval = -EINVAL; + } + return retval; +} + +static 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); + -- cgit v1.2.3