diff options
Diffstat (limited to 'drivers/input/misc/uinput.c')
| -rw-r--r-- | drivers/input/misc/uinput.c | 1102 |
1 files changed, 1102 insertions, 0 deletions
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c new file mode 100644 index 000000000..f2593133e --- /dev/null +++ b/drivers/input/misc/uinput.c @@ -0,0 +1,1102 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * User level driver support for input subsystem + * + * Heavily based on evdev.c by Vojtech Pavlik + * + * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org> + * + * Changes/Revisions: + * 0.4 01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>) + * - add UI_GET_SYSNAME ioctl + * 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 <uapi/linux/uinput.h> +#include <linux/poll.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/fs.h> +#include <linux/miscdevice.h> +#include <linux/overflow.h> +#include <linux/input/mt.h> +#include "../input-compat.h" + +#define UINPUT_NAME "uinput" +#define UINPUT_BUFFER_SIZE 16 +#define UINPUT_NUM_REQUESTS 16 + +enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED }; + +struct uinput_request { + unsigned int id; + unsigned int code; /* UI_FF_UPLOAD, UI_FF_ERASE */ + + int retval; + struct completion done; + + union { + unsigned int effect_id; + struct { + struct ff_effect *effect; + struct ff_effect *old; + } upload; + } u; +}; + +struct uinput_device { + struct input_dev *dev; + struct mutex mutex; + enum uinput_state state; + wait_queue_head_t waitq; + unsigned char ready; + unsigned char head; + unsigned char tail; + struct input_event buff[UINPUT_BUFFER_SIZE]; + unsigned int ff_effects_max; + + struct uinput_request *requests[UINPUT_NUM_REQUESTS]; + wait_queue_head_t requests_waitq; + spinlock_t requests_lock; +}; + +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); + struct timespec64 ts; + + ktime_get_ts64(&ts); + + udev->buff[udev->head] = (struct input_event) { + .input_event_sec = ts.tv_sec, + .input_event_usec = ts.tv_nsec / NSEC_PER_USEC, + .type = type, + .code = code, + .value = value, + }; + + udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE; + + wake_up_interruptible(&udev->waitq); + + return 0; +} + +/* Atomically allocate an ID for the given request. Returns 0 on success. */ +static bool uinput_request_alloc_id(struct uinput_device *udev, + struct uinput_request *request) +{ + unsigned int id; + bool reserved = false; + + spin_lock(&udev->requests_lock); + + for (id = 0; id < UINPUT_NUM_REQUESTS; id++) { + if (!udev->requests[id]) { + request->id = id; + udev->requests[id] = request; + reserved = true; + break; + } + } + + spin_unlock(&udev->requests_lock); + return reserved; +} + +static struct uinput_request *uinput_request_find(struct uinput_device *udev, + unsigned int id) +{ + /* Find an input request, by ID. Returns NULL if the ID isn't valid. */ + if (id >= UINPUT_NUM_REQUESTS) + return NULL; + + return udev->requests[id]; +} + +static 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_release_slot(struct uinput_device *udev, + unsigned int id) +{ + /* Mark slot as available */ + spin_lock(&udev->requests_lock); + udev->requests[id] = NULL; + spin_unlock(&udev->requests_lock); + + wake_up(&udev->requests_waitq); +} + +static int uinput_request_send(struct uinput_device *udev, + struct uinput_request *request) +{ + int retval; + + retval = mutex_lock_interruptible(&udev->mutex); + if (retval) + return retval; + + if (udev->state != UIST_CREATED) { + retval = -ENODEV; + goto out; + } + + init_completion(&request->done); + + /* + * Tell our userspace application about this new request + * by queueing an input event. + */ + uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id); + + out: + mutex_unlock(&udev->mutex); + return retval; +} + +static int uinput_request_submit(struct uinput_device *udev, + struct uinput_request *request) +{ + int retval; + + retval = uinput_request_reserve_slot(udev, request); + if (retval) + return retval; + + retval = uinput_request_send(udev, request); + if (retval) + goto out; + + if (!wait_for_completion_timeout(&request->done, 30 * HZ)) { + retval = -ETIMEDOUT; + goto out; + } + + retval = request->retval; + + out: + uinput_request_release_slot(udev, request->id); + return retval; +} + +/* + * Fail all outstanding requests so handlers don't wait for the userspace + * to finish processing them. + */ +static void uinput_flush_requests(struct uinput_device *udev) +{ + struct uinput_request *request; + int i; + + spin_lock(&udev->requests_lock); + + for (i = 0; i < UINPUT_NUM_REQUESTS; i++) { + request = udev->requests[i]; + if (request) { + request->retval = -ENODEV; + complete(&request->done); + } + } + + spin_unlock(&udev->requests_lock); +} + +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_device *udev = input_get_drvdata(dev); + struct uinput_request request; + + /* + * uinput driver does not currently support periodic effects with + * custom waveform since it does not have a way to pass buffer of + * samples (custom_data) to userspace. If ever there is a device + * supporting custom waveforms we would need to define an additional + * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out. + */ + if (effect->type == FF_PERIODIC && + effect->u.periodic.waveform == FF_CUSTOM) + return -EINVAL; + + request.code = UI_FF_UPLOAD; + request.u.upload.effect = effect; + request.u.upload.old = old; + + return uinput_request_submit(udev, &request); +} + +static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id) +{ + struct uinput_device *udev = input_get_drvdata(dev); + struct uinput_request request; + + if (!test_bit(EV_FF, dev->evbit)) + return -ENOSYS; + + request.code = UI_FF_ERASE; + request.u.effect_id = effect_id; + + return uinput_request_submit(udev, &request); +} + +static int uinput_dev_flush(struct input_dev *dev, struct file *file) +{ + /* + * If we are called with file == NULL that means we are tearing + * down the device, and therefore we can not handle FF erase + * requests: either we are handling UI_DEV_DESTROY (and holding + * the udev->mutex), or the file descriptor is closed and there is + * nobody on the other side anymore. + */ + return file ? input_ff_flush(dev, file) : 0; +} + +static void uinput_destroy_device(struct uinput_device *udev) +{ + const char *name, *phys; + struct input_dev *dev = udev->dev; + enum uinput_state old_state = udev->state; + + udev->state = UIST_NEW_DEVICE; + + if (dev) { + name = dev->name; + phys = dev->phys; + if (old_state == UIST_CREATED) { + uinput_flush_requests(udev); + input_unregister_device(dev); + } else { + input_free_device(dev); + } + kfree(name); + kfree(phys); + udev->dev = NULL; + } +} + +static int uinput_create_device(struct uinput_device *udev) +{ + struct input_dev *dev = udev->dev; + int error, nslot; + + if (udev->state != UIST_SETUP_COMPLETE) { + printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME); + return -EINVAL; + } + + if (test_bit(EV_ABS, dev->evbit)) { + input_alloc_absinfo(dev); + if (!dev->absinfo) { + error = -EINVAL; + goto fail1; + } + + if (test_bit(ABS_MT_SLOT, dev->absbit)) { + nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1; + error = input_mt_init_slots(dev, nslot, 0); + if (error) + goto fail1; + } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { + input_set_events_per_packet(dev, 60); + } + } + + if (test_bit(EV_FF, dev->evbit) && !udev->ff_effects_max) { + printk(KERN_DEBUG "%s: ff_effects_max should be non-zero when FF_BIT is set\n", + UINPUT_NAME); + error = -EINVAL; + goto fail1; + } + + 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; + /* + * The standard input_ff_flush() implementation does + * not quite work for uinput as we can't reasonably + * handle FF requests during device teardown. + */ + dev->flush = uinput_dev_flush; + } + + dev->event = uinput_dev_event; + + input_set_drvdata(udev->dev, udev); + + 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; + + 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; + stream_open(inode, file); + + return 0; +} + +static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code, + const struct input_absinfo *abs) +{ + int min, max, range; + + min = abs->minimum; + max = abs->maximum; + + if ((min != 0 || max != 0) && max < min) { + printk(KERN_DEBUG + "%s: invalid abs[%02x] min:%d max:%d\n", + UINPUT_NAME, code, min, max); + return -EINVAL; + } + + if (!check_sub_overflow(max, min, &range) && abs->flat > range) { + printk(KERN_DEBUG + "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n", + UINPUT_NAME, code, abs->flat, min, max); + return -EINVAL; + } + + return 0; +} + +static int uinput_validate_absbits(struct input_dev *dev) +{ + unsigned int cnt; + int error; + + if (!test_bit(EV_ABS, dev->evbit)) + return 0; + + /* + * Check if absmin/absmax/absfuzz/absflat are sane. + */ + + for_each_set_bit(cnt, dev->absbit, ABS_CNT) { + if (!dev->absinfo) + return -EINVAL; + + error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]); + if (error) + return error; + } + + return 0; +} + +static int uinput_dev_setup(struct uinput_device *udev, + struct uinput_setup __user *arg) +{ + struct uinput_setup setup; + struct input_dev *dev; + + if (udev->state == UIST_CREATED) + return -EINVAL; + + if (copy_from_user(&setup, arg, sizeof(setup))) + return -EFAULT; + + if (!setup.name[0]) + return -EINVAL; + + dev = udev->dev; + dev->id = setup.id; + udev->ff_effects_max = setup.ff_effects_max; + + kfree(dev->name); + dev->name = kstrndup(setup.name, UINPUT_MAX_NAME_SIZE, GFP_KERNEL); + if (!dev->name) + return -ENOMEM; + + udev->state = UIST_SETUP_COMPLETE; + return 0; +} + +static int uinput_abs_setup(struct uinput_device *udev, + struct uinput_setup __user *arg, size_t size) +{ + struct uinput_abs_setup setup = {}; + struct input_dev *dev; + int error; + + if (size > sizeof(setup)) + return -E2BIG; + + if (udev->state == UIST_CREATED) + return -EINVAL; + + if (copy_from_user(&setup, arg, size)) + return -EFAULT; + + if (setup.code > ABS_MAX) + return -ERANGE; + + dev = udev->dev; + + error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo); + if (error) + return error; + + input_alloc_absinfo(dev); + if (!dev->absinfo) + return -ENOMEM; + + set_bit(setup.code, dev->absbit); + dev->absinfo[setup.code] = setup.absinfo; + return 0; +} + +/* legacy setup via write() */ +static int uinput_setup_device_legacy(struct uinput_device *udev, + const char __user *buffer, size_t count) +{ + struct uinput_user_dev *user_dev; + struct input_dev *dev; + int i; + int retval; + + if (count != sizeof(struct uinput_user_dev)) + return -EINVAL; + + if (!udev->dev) { + udev->dev = input_allocate_device(); + if (!udev->dev) + return -ENOMEM; + } + + dev = udev->dev; + + user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev)); + if (IS_ERR(user_dev)) + return PTR_ERR(user_dev); + + udev->ff_effects_max = user_dev->ff_effects_max; + + /* Ensure name is filled in */ + if (!user_dev->name[0]) { + retval = -EINVAL; + goto exit; + } + + kfree(dev->name); + dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE, + GFP_KERNEL); + if (!dev->name) { + retval = -ENOMEM; + goto exit; + } + + 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; + + for (i = 0; i < ABS_CNT; i++) { + input_abs_set_max(dev, i, user_dev->absmax[i]); + input_abs_set_min(dev, i, user_dev->absmin[i]); + input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]); + input_abs_set_flat(dev, i, user_dev->absflat[i]); + } + + retval = uinput_validate_absbits(dev); + if (retval < 0) + goto exit; + + udev->state = UIST_SETUP_COMPLETE; + retval = count; + + exit: + kfree(user_dev); + return retval; +} + +static ssize_t uinput_inject_events(struct uinput_device *udev, + const char __user *buffer, size_t count) +{ + struct input_event ev; + size_t bytes = 0; + + if (count != 0 && count < input_event_size()) + return -EINVAL; + + while (bytes + input_event_size() <= count) { + /* + * Note that even if some events were fetched successfully + * we are still going to return EFAULT instead of partial + * count to let userspace know that it got it's buffers + * all wrong. + */ + if (input_event_from_user(buffer + bytes, &ev)) + return -EFAULT; + + input_event(udev->dev, ev.type, ev.code, ev.value); + bytes += input_event_size(); + cond_resched(); + } + + return bytes; +} + +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; + + if (count == 0) + return 0; + + retval = mutex_lock_interruptible(&udev->mutex); + if (retval) + return retval; + + retval = udev->state == UIST_CREATED ? + uinput_inject_events(udev, buffer, count) : + uinput_setup_device_legacy(udev, buffer, count); + + mutex_unlock(&udev->mutex); + + return retval; +} + +static bool uinput_fetch_next_event(struct uinput_device *udev, + struct input_event *event) +{ + bool have_event; + + spin_lock_irq(&udev->dev->event_lock); + + have_event = udev->head != udev->tail; + if (have_event) { + *event = udev->buff[udev->tail]; + udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE; + } + + spin_unlock_irq(&udev->dev->event_lock); + + return have_event; +} + +static ssize_t uinput_events_to_user(struct uinput_device *udev, + char __user *buffer, size_t count) +{ + struct input_event event; + size_t read = 0; + + while (read + input_event_size() <= count && + uinput_fetch_next_event(udev, &event)) { + + if (input_event_to_user(buffer + read, &event)) + return -EFAULT; + + read += input_event_size(); + } + + return read; +} + +static ssize_t uinput_read(struct file *file, char __user *buffer, + size_t count, loff_t *ppos) +{ + struct uinput_device *udev = file->private_data; + ssize_t retval; + + if (count != 0 && count < input_event_size()) + return -EINVAL; + + do { + retval = mutex_lock_interruptible(&udev->mutex); + if (retval) + return retval; + + if (udev->state != UIST_CREATED) + retval = -ENODEV; + else if (udev->head == udev->tail && + (file->f_flags & O_NONBLOCK)) + retval = -EAGAIN; + else + retval = uinput_events_to_user(udev, buffer, count); + + mutex_unlock(&udev->mutex); + + if (retval || count == 0) + break; + + if (!(file->f_flags & O_NONBLOCK)) + retval = wait_event_interruptible(udev->waitq, + udev->head != udev->tail || + udev->state != UIST_CREATED); + } while (retval == 0); + + return retval; +} + +static __poll_t uinput_poll(struct file *file, poll_table *wait) +{ + struct uinput_device *udev = file->private_data; + __poll_t mask = EPOLLOUT | EPOLLWRNORM; /* uinput is always writable */ + + poll_wait(file, &udev->waitq, wait); + + if (udev->head != udev->tail) + mask |= EPOLLIN | EPOLLRDNORM; + + return mask; +} + +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; +} + +#ifdef CONFIG_COMPAT +struct uinput_ff_upload_compat { + __u32 request_id; + __s32 retval; + struct ff_effect_compat effect; + struct ff_effect_compat old; +}; + +static int uinput_ff_upload_to_user(char __user *buffer, + const struct uinput_ff_upload *ff_up) +{ + if (in_compat_syscall()) { + struct uinput_ff_upload_compat ff_up_compat; + + ff_up_compat.request_id = ff_up->request_id; + ff_up_compat.retval = ff_up->retval; + /* + * It so happens that the pointer that gives us the trouble + * is the last field in the structure. Since we don't support + * custom waveforms in uinput anyway we can just copy the whole + * thing (to the compat size) and ignore the pointer. + */ + memcpy(&ff_up_compat.effect, &ff_up->effect, + sizeof(struct ff_effect_compat)); + memcpy(&ff_up_compat.old, &ff_up->old, + sizeof(struct ff_effect_compat)); + + if (copy_to_user(buffer, &ff_up_compat, + sizeof(struct uinput_ff_upload_compat))) + return -EFAULT; + } else { + if (copy_to_user(buffer, ff_up, + sizeof(struct uinput_ff_upload))) + return -EFAULT; + } + + return 0; +} + +static int uinput_ff_upload_from_user(const char __user *buffer, + struct uinput_ff_upload *ff_up) +{ + if (in_compat_syscall()) { + struct uinput_ff_upload_compat ff_up_compat; + + if (copy_from_user(&ff_up_compat, buffer, + sizeof(struct uinput_ff_upload_compat))) + return -EFAULT; + + ff_up->request_id = ff_up_compat.request_id; + ff_up->retval = ff_up_compat.retval; + memcpy(&ff_up->effect, &ff_up_compat.effect, + sizeof(struct ff_effect_compat)); + memcpy(&ff_up->old, &ff_up_compat.old, + sizeof(struct ff_effect_compat)); + + } else { + if (copy_from_user(ff_up, buffer, + sizeof(struct uinput_ff_upload))) + return -EFAULT; + } + + return 0; +} + +#else + +static int uinput_ff_upload_to_user(char __user *buffer, + const struct uinput_ff_upload *ff_up) +{ + if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload))) + return -EFAULT; + + return 0; +} + +static int uinput_ff_upload_from_user(const char __user *buffer, + struct uinput_ff_upload *ff_up) +{ + if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload))) + return -EFAULT; + + return 0; +} + +#endif + +#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 int uinput_str_to_user(void __user *dest, const char *str, + unsigned int maxlen) +{ + char __user *p = dest; + int len, ret; + + if (!str) + return -ENOENT; + + if (maxlen == 0) + return -EINVAL; + + len = strlen(str) + 1; + if (len > maxlen) + len = maxlen; + + ret = copy_to_user(p, str, len); + if (ret) + return -EFAULT; + + /* force terminating '\0' */ + ret = put_user(0, p + len - 1); + return ret ? -EFAULT : len; +} + +static long uinput_ioctl_handler(struct file *file, unsigned int cmd, + unsigned long arg, void __user *p) +{ + int retval; + struct uinput_device *udev = file->private_data; + struct uinput_ff_upload ff_up; + struct uinput_ff_erase ff_erase; + struct uinput_request *req; + char *phys; + const char *name; + unsigned int size; + + retval = mutex_lock_interruptible(&udev->mutex); + if (retval) + return retval; + + if (!udev->dev) { + udev->dev = input_allocate_device(); + if (!udev->dev) { + retval = -ENOMEM; + goto out; + } + } + + switch (cmd) { + case UI_GET_VERSION: + if (put_user(UINPUT_VERSION, (unsigned int __user *)p)) + retval = -EFAULT; + goto out; + + case UI_DEV_CREATE: + retval = uinput_create_device(udev); + goto out; + + case UI_DEV_DESTROY: + uinput_destroy_device(udev); + goto out; + + case UI_DEV_SETUP: + retval = uinput_dev_setup(udev, p); + goto out; + + /* UI_ABS_SETUP is handled in the variable size ioctls */ + + case UI_SET_EVBIT: + retval = uinput_set_bit(arg, evbit, EV_MAX); + goto out; + + case UI_SET_KEYBIT: + retval = uinput_set_bit(arg, keybit, KEY_MAX); + goto out; + + case UI_SET_RELBIT: + retval = uinput_set_bit(arg, relbit, REL_MAX); + goto out; + + case UI_SET_ABSBIT: + retval = uinput_set_bit(arg, absbit, ABS_MAX); + goto out; + + case UI_SET_MSCBIT: + retval = uinput_set_bit(arg, mscbit, MSC_MAX); + goto out; + + case UI_SET_LEDBIT: + retval = uinput_set_bit(arg, ledbit, LED_MAX); + goto out; + + case UI_SET_SNDBIT: + retval = uinput_set_bit(arg, sndbit, SND_MAX); + goto out; + + case UI_SET_FFBIT: + retval = uinput_set_bit(arg, ffbit, FF_MAX); + goto out; + + case UI_SET_SWBIT: + retval = uinput_set_bit(arg, swbit, SW_MAX); + goto out; + + case UI_SET_PROPBIT: + retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX); + goto out; + + case UI_SET_PHYS: + if (udev->state == UIST_CREATED) { + retval = -EINVAL; + goto out; + } + + phys = strndup_user(p, 1024); + if (IS_ERR(phys)) { + retval = PTR_ERR(phys); + goto out; + } + + kfree(udev->dev->phys); + udev->dev->phys = phys; + goto out; + + case UI_BEGIN_FF_UPLOAD: + retval = uinput_ff_upload_from_user(p, &ff_up); + if (retval) + goto out; + + req = uinput_request_find(udev, ff_up.request_id); + if (!req || req->code != UI_FF_UPLOAD || + !req->u.upload.effect) { + retval = -EINVAL; + goto out; + } + + ff_up.retval = 0; + ff_up.effect = *req->u.upload.effect; + if (req->u.upload.old) + ff_up.old = *req->u.upload.old; + else + memset(&ff_up.old, 0, sizeof(struct ff_effect)); + + retval = uinput_ff_upload_to_user(p, &ff_up); + goto out; + + case UI_BEGIN_FF_ERASE: + if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { + retval = -EFAULT; + goto out; + } + + req = uinput_request_find(udev, ff_erase.request_id); + if (!req || req->code != UI_FF_ERASE) { + retval = -EINVAL; + goto out; + } + + ff_erase.retval = 0; + ff_erase.effect_id = req->u.effect_id; + if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) { + retval = -EFAULT; + goto out; + } + + goto out; + + case UI_END_FF_UPLOAD: + retval = uinput_ff_upload_from_user(p, &ff_up); + if (retval) + goto out; + + req = uinput_request_find(udev, ff_up.request_id); + if (!req || req->code != UI_FF_UPLOAD || + !req->u.upload.effect) { + retval = -EINVAL; + goto out; + } + + req->retval = ff_up.retval; + complete(&req->done); + goto out; + + case UI_END_FF_ERASE: + if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { + retval = -EFAULT; + goto out; + } + + req = uinput_request_find(udev, ff_erase.request_id); + if (!req || req->code != UI_FF_ERASE) { + retval = -EINVAL; + goto out; + } + + req->retval = ff_erase.retval; + complete(&req->done); + goto out; + } + + size = _IOC_SIZE(cmd); + + /* Now check variable-length commands */ + switch (cmd & ~IOCSIZE_MASK) { + case UI_GET_SYSNAME(0): + if (udev->state != UIST_CREATED) { + retval = -ENOENT; + goto out; + } + name = dev_name(&udev->dev->dev); + retval = uinput_str_to_user(p, name, size); + goto out; + + case UI_ABS_SETUP & ~IOCSIZE_MASK: + retval = uinput_abs_setup(udev, p, size); + goto out; + } + + retval = -EINVAL; + out: + mutex_unlock(&udev->mutex); + return retval; +} + +static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg); +} + +#ifdef CONFIG_COMPAT + +/* + * These IOCTLs change their size and thus their numbers between + * 32 and 64 bits. + */ +#define UI_SET_PHYS_COMPAT \ + _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t) +#define UI_BEGIN_FF_UPLOAD_COMPAT \ + _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload_compat) +#define UI_END_FF_UPLOAD_COMPAT \ + _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload_compat) + +static long uinput_compat_ioctl(struct file *file, + unsigned int cmd, unsigned long arg) +{ + switch (cmd) { + case UI_SET_PHYS_COMPAT: + cmd = UI_SET_PHYS; + break; + case UI_BEGIN_FF_UPLOAD_COMPAT: + cmd = UI_BEGIN_FF_UPLOAD; + break; + case UI_END_FF_UPLOAD_COMPAT: + cmd = UI_END_FF_UPLOAD; + break; + } + + return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg)); +} +#endif + +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, +#ifdef CONFIG_COMPAT + .compat_ioctl = uinput_compat_ioctl, +#endif + .llseek = no_llseek, +}; + +static struct miscdevice uinput_misc = { + .fops = &uinput_fops, + .minor = UINPUT_MINOR, + .name = UINPUT_NAME, +}; +module_misc_device(uinput_misc); + +MODULE_ALIAS_MISCDEV(UINPUT_MINOR); +MODULE_ALIAS("devname:" UINPUT_NAME); + +MODULE_AUTHOR("Aristeu Sergio Rozanski Filho"); +MODULE_DESCRIPTION("User level driver support for input subsystem"); +MODULE_LICENSE("GPL"); |