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1102 lines
24 KiB
1102 lines
24 KiB
// 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 <[email protected]> |
|
* |
|
* Changes/Revisions: |
|
* 0.4 01/09/2014 (Benjamin Tissoires <[email protected]>) |
|
* - add UI_GET_SYSNAME ioctl |
|
* 0.3 09/04/2006 (Anssi Hannula <[email protected]>) |
|
* - updated ff support for the changes in kernel interface |
|
* - added MODULE_VERSION |
|
* 0.2 16/10/2004 (Micah Dowty <[email protected]>) |
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* - 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> |
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#include "../input-compat.h" |
|
|
|
#define UINPUT_NAME "uinput" |
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#define UINPUT_BUFFER_SIZE 16 |
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#define UINPUT_NUM_REQUESTS 16 |
|
|
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enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED }; |
|
|
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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; |
|
|
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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; |
|
|
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spin_lock(&udev->requests_lock); |
|
|
|
for (i = 0; i < UINPUT_NUM_REQUESTS; i++) { |
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request = udev->requests[i]; |
|
if (request) { |
|
request->retval = -ENODEV; |
|
complete(&request->done); |
|
} |
|
} |
|
|
|
spin_unlock(&udev->requests_lock); |
|
} |
|
|
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static void uinput_dev_set_gain(struct input_dev *dev, u16 gain) |
|
{ |
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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); |
|
} |
|
|
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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");
|
|
|