diff options
Diffstat (limited to 'drivers/input/misc/uinput.c')
-rw-r--r-- | drivers/input/misc/uinput.c | 662 |
1 files changed, 662 insertions, 0 deletions
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c new file mode 100644 index 0000000..223d56d --- /dev/null +++ b/drivers/input/misc/uinput.c @@ -0,0 +1,662 @@ +/* + * 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: + * 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>) + * - updated ff support for the changes in kernel interface + * - added MODULE_VERSION + * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>) + * - added force feedback support + * - added UI_SET_PHYS + * 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/smp_lock.h> +#include <linux/fs.h> +#include <linux/miscdevice.h> +#include <linux/uinput.h> + +static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) +{ + struct uinput_device *udev = input_get_drvdata(dev); + + 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 uinput_device *udev, struct uinput_request *request) +{ + /* Atomically allocate an ID for the given request. Returns 0 on success. */ + int id; + int err = -1; + + spin_lock(&udev->requests_lock); + + for (id = 0; id < UINPUT_NUM_REQUESTS; id++) + if (!udev->requests[id]) { + request->id = id; + udev->requests[id] = request; + err = 0; + break; + } + + spin_unlock(&udev->requests_lock); + return err; +} + +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; + return udev->requests[id]; +} + +static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request) +{ + /* Allocate slot. If none are available right away, wait. */ + return wait_event_interruptible(udev->requests_waitq, + !uinput_request_alloc_id(udev, request)); +} + +static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request) +{ + /* Mark slot as available */ + udev->requests[request->id] = NULL; + wake_up(&udev->requests_waitq); + + complete(&request->done); +} + +static int uinput_request_submit(struct input_dev *dev, struct uinput_request *request) +{ + /* 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 */ + wait_for_completion(&request->done); + return request->retval; +} + +static void uinput_dev_set_gain(struct input_dev *dev, u16 gain) +{ + uinput_dev_event(dev, EV_FF, FF_GAIN, gain); +} + +static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude) +{ + uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude); +} + +static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value) +{ + return uinput_dev_event(dev, EV_FF, effect_id, value); +} + +static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old) +{ + struct uinput_request request; + int retval; + + request.id = -1; + init_completion(&request.done); + request.code = UI_FF_UPLOAD; + request.u.upload.effect = effect; + request.u.upload.old = old; + + retval = uinput_request_reserve_slot(input_get_drvdata(dev), &request); + if (!retval) + retval = uinput_request_submit(dev, &request); + + return retval; +} + +static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id) +{ + struct uinput_request request; + int retval; + + if (!test_bit(EV_FF, dev->evbit)) + return -ENOSYS; + + request.id = -1; + init_completion(&request.done); + request.code = UI_FF_ERASE; + request.u.effect_id = effect_id; + + retval = uinput_request_reserve_slot(input_get_drvdata(dev), &request); + if (!retval) + retval = uinput_request_submit(dev, &request); + + return retval; +} + +static void uinput_destroy_device(struct uinput_device *udev) +{ + const char *name, *phys; + + if (udev->dev) { + name = udev->dev->name; + phys = udev->dev->phys; + if (udev->state == UIST_CREATED) + input_unregister_device(udev->dev); + else + input_free_device(udev->dev); + kfree(name); + kfree(phys); + udev->dev = NULL; + } + + udev->state = UIST_NEW_DEVICE; +} + +static int uinput_create_device(struct uinput_device *udev) +{ + struct input_dev *dev = udev->dev; + int error; + + if (udev->state != UIST_SETUP_COMPLETE) { + printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME); + return -EINVAL; + } + + if (udev->ff_effects_max) { + error = input_ff_create(dev, udev->ff_effects_max); + if (error) + goto fail1; + + dev->ff->upload = uinput_dev_upload_effect; + dev->ff->erase = uinput_dev_erase_effect; + dev->ff->playback = uinput_dev_playback; + dev->ff->set_gain = uinput_dev_set_gain; + dev->ff->set_autocenter = uinput_dev_set_autocenter; + } + + error = input_register_device(udev->dev); + if (error) + goto fail2; + + udev->state = UIST_CREATED; + + return 0; + + fail2: input_ff_destroy(dev); + fail1: uinput_destroy_device(udev); + return error; +} + +static int uinput_open(struct inode *inode, struct file *file) +{ + struct uinput_device *newdev; + + newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL); + if (!newdev) + return -ENOMEM; + + lock_kernel(); + mutex_init(&newdev->mutex); + spin_lock_init(&newdev->requests_lock); + init_waitqueue_head(&newdev->requests_waitq); + init_waitqueue_head(&newdev->waitq); + newdev->state = UIST_NEW_DEVICE; + + file->private_data = newdev; + unlock_kernel(); + + return 0; +} + +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_allocate_device(struct uinput_device *udev) +{ + udev->dev = input_allocate_device(); + if (!udev->dev) + return -ENOMEM; + + udev->dev->event = uinput_dev_event; + input_set_drvdata(udev->dev, udev); + + return 0; +} + +static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count) +{ + struct uinput_user_dev *user_dev; + struct input_dev *dev; + char *name; + int size; + int retval; + + if (count != sizeof(struct uinput_user_dev)) + return -EINVAL; + + if (!udev->dev) { + retval = uinput_allocate_device(udev); + if (retval) + return retval; + } + + dev = udev->dev; + + user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL); + if (!user_dev) + return -ENOMEM; + + if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) { + retval = -EFAULT; + goto exit; + } + + udev->ff_effects_max = user_dev->ff_effects_max; + + size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1; + if (!size) { + retval = -EINVAL; + goto exit; + } + + kfree(dev->name); + dev->name = name = kmalloc(size, GFP_KERNEL); + if (!name) { + retval = -ENOMEM; + goto exit; + } + strlcpy(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; + + 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) + goto exit; + } + + udev->state = UIST_SETUP_COMPLETE; + retval = count; + + exit: + kfree(user_dev); + return retval; +} + +static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count) +{ + struct input_event ev; + + if (count != sizeof(struct input_event)) + return -EINVAL; + + if (copy_from_user(&ev, buffer, sizeof(struct input_event))) + return -EFAULT; + + input_event(udev->dev, ev.type, ev.code, ev.value); + + return sizeof(struct input_event); +} + +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; + int retval; + + retval = mutex_lock_interruptible(&udev->mutex); + if (retval) + return retval; + + retval = udev->state == UIST_CREATED ? + uinput_inject_event(udev, buffer, count) : + uinput_setup_device(udev, buffer, count); + + mutex_unlock(&udev->mutex); + + return retval; +} + +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 (udev->state != UIST_CREATED) + return -ENODEV; + + if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK)) + return -EAGAIN; + + retval = wait_event_interruptible(udev->waitq, + udev->head != udev->tail || udev->state != UIST_CREATED); + if (retval) + return retval; + + retval = mutex_lock_interruptible(&udev->mutex); + if (retval) + return retval; + + if (udev->state != UIST_CREATED) { + retval = -ENODEV; + goto out; + } + + 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))) { + retval = -EFAULT; + goto out; + } + udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE; + retval += sizeof(struct input_event); + } + + out: + mutex_unlock(&udev->mutex); + + 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_release(struct inode *inode, struct file *file) +{ + struct uinput_device *udev = file->private_data; + + uinput_destroy_device(udev); + kfree(udev); + + return 0; +} + +#define uinput_set_bit(_arg, _bit, _max) \ +({ \ + int __ret = 0; \ + if (udev->state == UIST_CREATED) \ + __ret = -EINVAL; \ + else if ((_arg) > (_max)) \ + __ret = -EINVAL; \ + else set_bit((_arg), udev->dev->_bit); \ + __ret; \ +}) + +static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + int retval; + 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; + char *phys; + + udev = file->private_data; + + retval = mutex_lock_interruptible(&udev->mutex); + if (retval) + return retval; + + if (!udev->dev) { + retval = uinput_allocate_device(udev); + if (retval) + goto out; + } + + switch (cmd) { + case UI_DEV_CREATE: + retval = uinput_create_device(udev); + break; + + case UI_DEV_DESTROY: + uinput_destroy_device(udev); + break; + + case UI_SET_EVBIT: + retval = uinput_set_bit(arg, evbit, EV_MAX); + break; + + case UI_SET_KEYBIT: + retval = uinput_set_bit(arg, keybit, KEY_MAX); + break; + + case UI_SET_RELBIT: + retval = uinput_set_bit(arg, relbit, REL_MAX); + break; + + case UI_SET_ABSBIT: + retval = uinput_set_bit(arg, absbit, ABS_MAX); + break; + + case UI_SET_MSCBIT: + retval = uinput_set_bit(arg, mscbit, MSC_MAX); + break; + + case UI_SET_LEDBIT: + retval = uinput_set_bit(arg, ledbit, LED_MAX); + break; + + case UI_SET_SNDBIT: + retval = uinput_set_bit(arg, sndbit, SND_MAX); + break; + + case UI_SET_FFBIT: + retval = uinput_set_bit(arg, ffbit, FF_MAX); + break; + + case UI_SET_SWBIT: + retval = uinput_set_bit(arg, swbit, SW_MAX); + break; + + case UI_SET_PHYS: + if (udev->state == UIST_CREATED) { + retval = -EINVAL; + goto out; + } + length = strnlen_user(p, 1024); + if (length <= 0) { + retval = -EFAULT; + break; + } + kfree(udev->dev->phys); + udev->dev->phys = phys = kmalloc(length, GFP_KERNEL); + if (!phys) { + retval = -ENOMEM; + break; + } + if (copy_from_user(phys, p, length)) { + udev->dev->phys = NULL; + kfree(phys); + retval = -EFAULT; + break; + } + 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.upload.effect)) { + retval = -EINVAL; + break; + } + ff_up.retval = 0; + memcpy(&ff_up.effect, req->u.upload.effect, sizeof(struct ff_effect)); + if (req->u.upload.old) + memcpy(&ff_up.old, req->u.upload.old, sizeof(struct ff_effect)); + else + memset(&ff_up.old, 0, 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.upload.effect)) { + retval = -EINVAL; + break; + } + req->retval = ff_up.retval; + uinput_request_done(udev, req); + 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; + uinput_request_done(udev, req); + break; + + default: + retval = -EINVAL; + } + + out: + mutex_unlock(&udev->mutex); + return retval; +} + +static const struct file_operations uinput_fops = { + .owner = THIS_MODULE, + .open = uinput_open, + .release = uinput_release, + .read = uinput_read, + .write = uinput_write, + .poll = uinput_poll, + .unlocked_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_VERSION("0.3"); + +module_init(uinput_init); +module_exit(uinput_exit); + |