mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
945 lines
22 KiB
945 lines
22 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Copyright (c) 2001 Paul Stewart |
|
* Copyright (c) 2001 Vojtech Pavlik |
|
* |
|
* HID char devices, giving access to raw HID device events. |
|
*/ |
|
|
|
/* |
|
* |
|
* Should you need to contact me, the author, you can do so either by |
|
* e-mail - mail your message to Paul Stewart <[email protected]> |
|
*/ |
|
|
|
#include <linux/poll.h> |
|
#include <linux/slab.h> |
|
#include <linux/sched/signal.h> |
|
#include <linux/module.h> |
|
#include <linux/init.h> |
|
#include <linux/input.h> |
|
#include <linux/usb.h> |
|
#include <linux/hid.h> |
|
#include <linux/hiddev.h> |
|
#include <linux/compat.h> |
|
#include <linux/vmalloc.h> |
|
#include <linux/nospec.h> |
|
#include "usbhid.h" |
|
|
|
#ifdef CONFIG_USB_DYNAMIC_MINORS |
|
#define HIDDEV_MINOR_BASE 0 |
|
#define HIDDEV_MINORS 256 |
|
#else |
|
#define HIDDEV_MINOR_BASE 96 |
|
#define HIDDEV_MINORS 16 |
|
#endif |
|
#define HIDDEV_BUFFER_SIZE 2048 |
|
|
|
struct hiddev_list { |
|
struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE]; |
|
int head; |
|
int tail; |
|
unsigned flags; |
|
struct fasync_struct *fasync; |
|
struct hiddev *hiddev; |
|
struct list_head node; |
|
struct mutex thread_lock; |
|
}; |
|
|
|
/* |
|
* Find a report, given the report's type and ID. The ID can be specified |
|
* indirectly by REPORT_ID_FIRST (which returns the first report of the given |
|
* type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the |
|
* given type which follows old_id. |
|
*/ |
|
static struct hid_report * |
|
hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo) |
|
{ |
|
unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK; |
|
unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK; |
|
struct hid_report_enum *report_enum; |
|
struct hid_report *report; |
|
struct list_head *list; |
|
|
|
if (rinfo->report_type < HID_REPORT_TYPE_MIN || |
|
rinfo->report_type > HID_REPORT_TYPE_MAX) |
|
return NULL; |
|
|
|
report_enum = hid->report_enum + |
|
(rinfo->report_type - HID_REPORT_TYPE_MIN); |
|
|
|
switch (flags) { |
|
case 0: /* Nothing to do -- report_id is already set correctly */ |
|
break; |
|
|
|
case HID_REPORT_ID_FIRST: |
|
if (list_empty(&report_enum->report_list)) |
|
return NULL; |
|
|
|
list = report_enum->report_list.next; |
|
report = list_entry(list, struct hid_report, list); |
|
rinfo->report_id = report->id; |
|
break; |
|
|
|
case HID_REPORT_ID_NEXT: |
|
report = report_enum->report_id_hash[rid]; |
|
if (!report) |
|
return NULL; |
|
|
|
list = report->list.next; |
|
if (list == &report_enum->report_list) |
|
return NULL; |
|
|
|
report = list_entry(list, struct hid_report, list); |
|
rinfo->report_id = report->id; |
|
break; |
|
|
|
default: |
|
return NULL; |
|
} |
|
|
|
return report_enum->report_id_hash[rinfo->report_id]; |
|
} |
|
|
|
/* |
|
* Perform an exhaustive search of the report table for a usage, given its |
|
* type and usage id. |
|
*/ |
|
static struct hid_field * |
|
hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref) |
|
{ |
|
int i, j; |
|
struct hid_report *report; |
|
struct hid_report_enum *report_enum; |
|
struct hid_field *field; |
|
|
|
if (uref->report_type < HID_REPORT_TYPE_MIN || |
|
uref->report_type > HID_REPORT_TYPE_MAX) |
|
return NULL; |
|
|
|
report_enum = hid->report_enum + |
|
(uref->report_type - HID_REPORT_TYPE_MIN); |
|
|
|
list_for_each_entry(report, &report_enum->report_list, list) { |
|
for (i = 0; i < report->maxfield; i++) { |
|
field = report->field[i]; |
|
for (j = 0; j < field->maxusage; j++) { |
|
if (field->usage[j].hid == uref->usage_code) { |
|
uref->report_id = report->id; |
|
uref->field_index = i; |
|
uref->usage_index = j; |
|
return field; |
|
} |
|
} |
|
} |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
static void hiddev_send_event(struct hid_device *hid, |
|
struct hiddev_usage_ref *uref) |
|
{ |
|
struct hiddev *hiddev = hid->hiddev; |
|
struct hiddev_list *list; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&hiddev->list_lock, flags); |
|
list_for_each_entry(list, &hiddev->list, node) { |
|
if (uref->field_index != HID_FIELD_INDEX_NONE || |
|
(list->flags & HIDDEV_FLAG_REPORT) != 0) { |
|
list->buffer[list->head] = *uref; |
|
list->head = (list->head + 1) & |
|
(HIDDEV_BUFFER_SIZE - 1); |
|
kill_fasync(&list->fasync, SIGIO, POLL_IN); |
|
} |
|
} |
|
spin_unlock_irqrestore(&hiddev->list_lock, flags); |
|
|
|
wake_up_interruptible(&hiddev->wait); |
|
} |
|
|
|
/* |
|
* This is where hid.c calls into hiddev to pass an event that occurred over |
|
* the interrupt pipe |
|
*/ |
|
void hiddev_hid_event(struct hid_device *hid, struct hid_field *field, |
|
struct hid_usage *usage, __s32 value) |
|
{ |
|
unsigned type = field->report_type; |
|
struct hiddev_usage_ref uref; |
|
|
|
uref.report_type = |
|
(type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
|
((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
|
((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); |
|
uref.report_id = field->report->id; |
|
uref.field_index = field->index; |
|
uref.usage_index = (usage - field->usage); |
|
uref.usage_code = usage->hid; |
|
uref.value = value; |
|
|
|
hiddev_send_event(hid, &uref); |
|
} |
|
EXPORT_SYMBOL_GPL(hiddev_hid_event); |
|
|
|
void hiddev_report_event(struct hid_device *hid, struct hid_report *report) |
|
{ |
|
unsigned type = report->type; |
|
struct hiddev_usage_ref uref; |
|
|
|
memset(&uref, 0, sizeof(uref)); |
|
uref.report_type = |
|
(type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT : |
|
((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : |
|
((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0)); |
|
uref.report_id = report->id; |
|
uref.field_index = HID_FIELD_INDEX_NONE; |
|
|
|
hiddev_send_event(hid, &uref); |
|
} |
|
|
|
/* |
|
* fasync file op |
|
*/ |
|
static int hiddev_fasync(int fd, struct file *file, int on) |
|
{ |
|
struct hiddev_list *list = file->private_data; |
|
|
|
return fasync_helper(fd, file, on, &list->fasync); |
|
} |
|
|
|
|
|
/* |
|
* release file op |
|
*/ |
|
static int hiddev_release(struct inode * inode, struct file * file) |
|
{ |
|
struct hiddev_list *list = file->private_data; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&list->hiddev->list_lock, flags); |
|
list_del(&list->node); |
|
spin_unlock_irqrestore(&list->hiddev->list_lock, flags); |
|
|
|
mutex_lock(&list->hiddev->existancelock); |
|
if (!--list->hiddev->open) { |
|
if (list->hiddev->exist) { |
|
hid_hw_close(list->hiddev->hid); |
|
hid_hw_power(list->hiddev->hid, PM_HINT_NORMAL); |
|
} else { |
|
mutex_unlock(&list->hiddev->existancelock); |
|
kfree(list->hiddev); |
|
vfree(list); |
|
return 0; |
|
} |
|
} |
|
|
|
mutex_unlock(&list->hiddev->existancelock); |
|
vfree(list); |
|
|
|
return 0; |
|
} |
|
|
|
static int __hiddev_open(struct hiddev *hiddev, struct file *file) |
|
{ |
|
struct hiddev_list *list; |
|
int error; |
|
|
|
lockdep_assert_held(&hiddev->existancelock); |
|
|
|
list = vzalloc(sizeof(*list)); |
|
if (!list) |
|
return -ENOMEM; |
|
|
|
mutex_init(&list->thread_lock); |
|
list->hiddev = hiddev; |
|
|
|
if (!hiddev->open++) { |
|
error = hid_hw_power(hiddev->hid, PM_HINT_FULLON); |
|
if (error < 0) |
|
goto err_drop_count; |
|
|
|
error = hid_hw_open(hiddev->hid); |
|
if (error < 0) |
|
goto err_normal_power; |
|
} |
|
|
|
spin_lock_irq(&hiddev->list_lock); |
|
list_add_tail(&list->node, &hiddev->list); |
|
spin_unlock_irq(&hiddev->list_lock); |
|
|
|
file->private_data = list; |
|
|
|
return 0; |
|
|
|
err_normal_power: |
|
hid_hw_power(hiddev->hid, PM_HINT_NORMAL); |
|
err_drop_count: |
|
hiddev->open--; |
|
vfree(list); |
|
return error; |
|
} |
|
|
|
/* |
|
* open file op |
|
*/ |
|
static int hiddev_open(struct inode *inode, struct file *file) |
|
{ |
|
struct usb_interface *intf; |
|
struct hid_device *hid; |
|
struct hiddev *hiddev; |
|
int res; |
|
|
|
intf = usbhid_find_interface(iminor(inode)); |
|
if (!intf) |
|
return -ENODEV; |
|
|
|
hid = usb_get_intfdata(intf); |
|
hiddev = hid->hiddev; |
|
|
|
mutex_lock(&hiddev->existancelock); |
|
res = hiddev->exist ? __hiddev_open(hiddev, file) : -ENODEV; |
|
mutex_unlock(&hiddev->existancelock); |
|
|
|
return res; |
|
} |
|
|
|
/* |
|
* "write" file op |
|
*/ |
|
static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) |
|
{ |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* "read" file op |
|
*/ |
|
static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) |
|
{ |
|
DEFINE_WAIT(wait); |
|
struct hiddev_list *list = file->private_data; |
|
int event_size; |
|
int retval; |
|
|
|
event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ? |
|
sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event); |
|
|
|
if (count < event_size) |
|
return 0; |
|
|
|
/* lock against other threads */ |
|
retval = mutex_lock_interruptible(&list->thread_lock); |
|
if (retval) |
|
return -ERESTARTSYS; |
|
|
|
while (retval == 0) { |
|
if (list->head == list->tail) { |
|
prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE); |
|
|
|
while (list->head == list->tail) { |
|
if (signal_pending(current)) { |
|
retval = -ERESTARTSYS; |
|
break; |
|
} |
|
if (!list->hiddev->exist) { |
|
retval = -EIO; |
|
break; |
|
} |
|
if (file->f_flags & O_NONBLOCK) { |
|
retval = -EAGAIN; |
|
break; |
|
} |
|
|
|
/* let O_NONBLOCK tasks run */ |
|
mutex_unlock(&list->thread_lock); |
|
schedule(); |
|
if (mutex_lock_interruptible(&list->thread_lock)) { |
|
finish_wait(&list->hiddev->wait, &wait); |
|
return -EINTR; |
|
} |
|
set_current_state(TASK_INTERRUPTIBLE); |
|
} |
|
finish_wait(&list->hiddev->wait, &wait); |
|
|
|
} |
|
|
|
if (retval) { |
|
mutex_unlock(&list->thread_lock); |
|
return retval; |
|
} |
|
|
|
|
|
while (list->head != list->tail && |
|
retval + event_size <= count) { |
|
if ((list->flags & HIDDEV_FLAG_UREF) == 0) { |
|
if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) { |
|
struct hiddev_event event; |
|
|
|
event.hid = list->buffer[list->tail].usage_code; |
|
event.value = list->buffer[list->tail].value; |
|
if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) { |
|
mutex_unlock(&list->thread_lock); |
|
return -EFAULT; |
|
} |
|
retval += sizeof(struct hiddev_event); |
|
} |
|
} else { |
|
if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE || |
|
(list->flags & HIDDEV_FLAG_REPORT) != 0) { |
|
|
|
if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) { |
|
mutex_unlock(&list->thread_lock); |
|
return -EFAULT; |
|
} |
|
retval += sizeof(struct hiddev_usage_ref); |
|
} |
|
} |
|
list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1); |
|
} |
|
|
|
} |
|
mutex_unlock(&list->thread_lock); |
|
|
|
return retval; |
|
} |
|
|
|
/* |
|
* "poll" file op |
|
* No kernel lock - fine |
|
*/ |
|
static __poll_t hiddev_poll(struct file *file, poll_table *wait) |
|
{ |
|
struct hiddev_list *list = file->private_data; |
|
|
|
poll_wait(file, &list->hiddev->wait, wait); |
|
if (list->head != list->tail) |
|
return EPOLLIN | EPOLLRDNORM | EPOLLOUT; |
|
if (!list->hiddev->exist) |
|
return EPOLLERR | EPOLLHUP; |
|
return 0; |
|
} |
|
|
|
/* |
|
* "ioctl" file op |
|
*/ |
|
static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) |
|
{ |
|
struct hid_device *hid = hiddev->hid; |
|
struct hiddev_report_info rinfo; |
|
struct hiddev_usage_ref_multi *uref_multi = NULL; |
|
struct hiddev_usage_ref *uref; |
|
struct hid_report *report; |
|
struct hid_field *field; |
|
int i; |
|
|
|
uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); |
|
if (!uref_multi) |
|
return -ENOMEM; |
|
uref = &uref_multi->uref; |
|
if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { |
|
if (copy_from_user(uref_multi, user_arg, |
|
sizeof(*uref_multi))) |
|
goto fault; |
|
} else { |
|
if (copy_from_user(uref, user_arg, sizeof(*uref))) |
|
goto fault; |
|
} |
|
|
|
switch (cmd) { |
|
case HIDIOCGUCODE: |
|
rinfo.report_type = uref->report_type; |
|
rinfo.report_id = uref->report_id; |
|
if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) |
|
goto inval; |
|
|
|
if (uref->field_index >= report->maxfield) |
|
goto inval; |
|
uref->field_index = array_index_nospec(uref->field_index, |
|
report->maxfield); |
|
|
|
field = report->field[uref->field_index]; |
|
if (uref->usage_index >= field->maxusage) |
|
goto inval; |
|
uref->usage_index = array_index_nospec(uref->usage_index, |
|
field->maxusage); |
|
|
|
uref->usage_code = field->usage[uref->usage_index].hid; |
|
|
|
if (copy_to_user(user_arg, uref, sizeof(*uref))) |
|
goto fault; |
|
|
|
goto goodreturn; |
|
|
|
default: |
|
if (cmd != HIDIOCGUSAGE && |
|
cmd != HIDIOCGUSAGES && |
|
uref->report_type == HID_REPORT_TYPE_INPUT) |
|
goto inval; |
|
|
|
if (uref->report_id == HID_REPORT_ID_UNKNOWN) { |
|
field = hiddev_lookup_usage(hid, uref); |
|
if (field == NULL) |
|
goto inval; |
|
} else { |
|
rinfo.report_type = uref->report_type; |
|
rinfo.report_id = uref->report_id; |
|
if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL) |
|
goto inval; |
|
|
|
if (uref->field_index >= report->maxfield) |
|
goto inval; |
|
uref->field_index = array_index_nospec(uref->field_index, |
|
report->maxfield); |
|
|
|
field = report->field[uref->field_index]; |
|
|
|
if (cmd == HIDIOCGCOLLECTIONINDEX) { |
|
if (uref->usage_index >= field->maxusage) |
|
goto inval; |
|
uref->usage_index = |
|
array_index_nospec(uref->usage_index, |
|
field->maxusage); |
|
} else if (uref->usage_index >= field->report_count) |
|
goto inval; |
|
} |
|
|
|
if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { |
|
if (uref_multi->num_values > HID_MAX_MULTI_USAGES || |
|
uref->usage_index + uref_multi->num_values > |
|
field->report_count) |
|
goto inval; |
|
|
|
uref->usage_index = |
|
array_index_nospec(uref->usage_index, |
|
field->report_count - |
|
uref_multi->num_values); |
|
} |
|
|
|
switch (cmd) { |
|
case HIDIOCGUSAGE: |
|
if (uref->usage_index >= field->report_count) |
|
goto inval; |
|
uref->value = field->value[uref->usage_index]; |
|
if (copy_to_user(user_arg, uref, sizeof(*uref))) |
|
goto fault; |
|
goto goodreturn; |
|
|
|
case HIDIOCSUSAGE: |
|
if (uref->usage_index >= field->report_count) |
|
goto inval; |
|
field->value[uref->usage_index] = uref->value; |
|
goto goodreturn; |
|
|
|
case HIDIOCGCOLLECTIONINDEX: |
|
i = field->usage[uref->usage_index].collection_index; |
|
kfree(uref_multi); |
|
return i; |
|
case HIDIOCGUSAGES: |
|
for (i = 0; i < uref_multi->num_values; i++) |
|
uref_multi->values[i] = |
|
field->value[uref->usage_index + i]; |
|
if (copy_to_user(user_arg, uref_multi, |
|
sizeof(*uref_multi))) |
|
goto fault; |
|
goto goodreturn; |
|
case HIDIOCSUSAGES: |
|
for (i = 0; i < uref_multi->num_values; i++) |
|
field->value[uref->usage_index + i] = |
|
uref_multi->values[i]; |
|
goto goodreturn; |
|
} |
|
|
|
goodreturn: |
|
kfree(uref_multi); |
|
return 0; |
|
fault: |
|
kfree(uref_multi); |
|
return -EFAULT; |
|
inval: |
|
kfree(uref_multi); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg) |
|
{ |
|
struct hid_device *hid = hiddev->hid; |
|
struct usb_device *dev = hid_to_usb_dev(hid); |
|
int idx, len; |
|
char *buf; |
|
|
|
if (get_user(idx, (int __user *)user_arg)) |
|
return -EFAULT; |
|
|
|
if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL) |
|
return -ENOMEM; |
|
|
|
if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) { |
|
kfree(buf); |
|
return -EINVAL; |
|
} |
|
|
|
if (copy_to_user(user_arg+sizeof(int), buf, len+1)) { |
|
kfree(buf); |
|
return -EFAULT; |
|
} |
|
|
|
kfree(buf); |
|
|
|
return len; |
|
} |
|
|
|
static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
|
{ |
|
struct hiddev_list *list = file->private_data; |
|
struct hiddev *hiddev = list->hiddev; |
|
struct hid_device *hid; |
|
struct hiddev_collection_info cinfo; |
|
struct hiddev_report_info rinfo; |
|
struct hiddev_field_info finfo; |
|
struct hiddev_devinfo dinfo; |
|
struct hid_report *report; |
|
struct hid_field *field; |
|
void __user *user_arg = (void __user *)arg; |
|
int i, r = -EINVAL; |
|
|
|
/* Called without BKL by compat methods so no BKL taken */ |
|
|
|
mutex_lock(&hiddev->existancelock); |
|
if (!hiddev->exist) { |
|
r = -ENODEV; |
|
goto ret_unlock; |
|
} |
|
|
|
hid = hiddev->hid; |
|
|
|
switch (cmd) { |
|
|
|
case HIDIOCGVERSION: |
|
r = put_user(HID_VERSION, (int __user *)arg) ? |
|
-EFAULT : 0; |
|
break; |
|
|
|
case HIDIOCAPPLICATION: |
|
if (arg >= hid->maxapplication) |
|
break; |
|
|
|
for (i = 0; i < hid->maxcollection; i++) |
|
if (hid->collection[i].type == |
|
HID_COLLECTION_APPLICATION && arg-- == 0) |
|
break; |
|
|
|
if (i < hid->maxcollection) |
|
r = hid->collection[i].usage; |
|
break; |
|
|
|
case HIDIOCGDEVINFO: |
|
{ |
|
struct usb_device *dev = hid_to_usb_dev(hid); |
|
struct usbhid_device *usbhid = hid->driver_data; |
|
|
|
memset(&dinfo, 0, sizeof(dinfo)); |
|
|
|
dinfo.bustype = BUS_USB; |
|
dinfo.busnum = dev->bus->busnum; |
|
dinfo.devnum = dev->devnum; |
|
dinfo.ifnum = usbhid->ifnum; |
|
dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor); |
|
dinfo.product = le16_to_cpu(dev->descriptor.idProduct); |
|
dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice); |
|
dinfo.num_applications = hid->maxapplication; |
|
|
|
r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ? |
|
-EFAULT : 0; |
|
break; |
|
} |
|
|
|
case HIDIOCGFLAG: |
|
r = put_user(list->flags, (int __user *)arg) ? |
|
-EFAULT : 0; |
|
break; |
|
|
|
case HIDIOCSFLAG: |
|
{ |
|
int newflags; |
|
|
|
if (get_user(newflags, (int __user *)arg)) { |
|
r = -EFAULT; |
|
break; |
|
} |
|
|
|
if ((newflags & ~HIDDEV_FLAGS) != 0 || |
|
((newflags & HIDDEV_FLAG_REPORT) != 0 && |
|
(newflags & HIDDEV_FLAG_UREF) == 0)) |
|
break; |
|
|
|
list->flags = newflags; |
|
|
|
r = 0; |
|
break; |
|
} |
|
|
|
case HIDIOCGSTRING: |
|
r = hiddev_ioctl_string(hiddev, cmd, user_arg); |
|
break; |
|
|
|
case HIDIOCINITREPORT: |
|
usbhid_init_reports(hid); |
|
hiddev->initialized = true; |
|
r = 0; |
|
break; |
|
|
|
case HIDIOCGREPORT: |
|
if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { |
|
r = -EFAULT; |
|
break; |
|
} |
|
|
|
if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT) |
|
break; |
|
|
|
report = hiddev_lookup_report(hid, &rinfo); |
|
if (report == NULL) |
|
break; |
|
|
|
hid_hw_request(hid, report, HID_REQ_GET_REPORT); |
|
hid_hw_wait(hid); |
|
|
|
r = 0; |
|
break; |
|
|
|
case HIDIOCSREPORT: |
|
if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { |
|
r = -EFAULT; |
|
break; |
|
} |
|
|
|
if (rinfo.report_type == HID_REPORT_TYPE_INPUT) |
|
break; |
|
|
|
report = hiddev_lookup_report(hid, &rinfo); |
|
if (report == NULL) |
|
break; |
|
|
|
hid_hw_request(hid, report, HID_REQ_SET_REPORT); |
|
hid_hw_wait(hid); |
|
|
|
r = 0; |
|
break; |
|
|
|
case HIDIOCGREPORTINFO: |
|
if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) { |
|
r = -EFAULT; |
|
break; |
|
} |
|
|
|
report = hiddev_lookup_report(hid, &rinfo); |
|
if (report == NULL) |
|
break; |
|
|
|
rinfo.num_fields = report->maxfield; |
|
|
|
r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ? |
|
-EFAULT : 0; |
|
break; |
|
|
|
case HIDIOCGFIELDINFO: |
|
if (copy_from_user(&finfo, user_arg, sizeof(finfo))) { |
|
r = -EFAULT; |
|
break; |
|
} |
|
|
|
rinfo.report_type = finfo.report_type; |
|
rinfo.report_id = finfo.report_id; |
|
|
|
report = hiddev_lookup_report(hid, &rinfo); |
|
if (report == NULL) |
|
break; |
|
|
|
if (finfo.field_index >= report->maxfield) |
|
break; |
|
finfo.field_index = array_index_nospec(finfo.field_index, |
|
report->maxfield); |
|
|
|
field = report->field[finfo.field_index]; |
|
memset(&finfo, 0, sizeof(finfo)); |
|
finfo.report_type = rinfo.report_type; |
|
finfo.report_id = rinfo.report_id; |
|
finfo.field_index = field->report_count - 1; |
|
finfo.maxusage = field->maxusage; |
|
finfo.flags = field->flags; |
|
finfo.physical = field->physical; |
|
finfo.logical = field->logical; |
|
finfo.application = field->application; |
|
finfo.logical_minimum = field->logical_minimum; |
|
finfo.logical_maximum = field->logical_maximum; |
|
finfo.physical_minimum = field->physical_minimum; |
|
finfo.physical_maximum = field->physical_maximum; |
|
finfo.unit_exponent = field->unit_exponent; |
|
finfo.unit = field->unit; |
|
|
|
r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ? |
|
-EFAULT : 0; |
|
break; |
|
|
|
case HIDIOCGUCODE: |
|
case HIDIOCGUSAGE: |
|
case HIDIOCSUSAGE: |
|
case HIDIOCGUSAGES: |
|
case HIDIOCSUSAGES: |
|
case HIDIOCGCOLLECTIONINDEX: |
|
if (!hiddev->initialized) { |
|
usbhid_init_reports(hid); |
|
hiddev->initialized = true; |
|
} |
|
r = hiddev_ioctl_usage(hiddev, cmd, user_arg); |
|
break; |
|
|
|
case HIDIOCGCOLLECTIONINFO: |
|
if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) { |
|
r = -EFAULT; |
|
break; |
|
} |
|
|
|
if (cinfo.index >= hid->maxcollection) |
|
break; |
|
cinfo.index = array_index_nospec(cinfo.index, |
|
hid->maxcollection); |
|
|
|
cinfo.type = hid->collection[cinfo.index].type; |
|
cinfo.usage = hid->collection[cinfo.index].usage; |
|
cinfo.level = hid->collection[cinfo.index].level; |
|
|
|
r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ? |
|
-EFAULT : 0; |
|
break; |
|
|
|
default: |
|
if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) |
|
break; |
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) { |
|
int len = strlen(hid->name) + 1; |
|
if (len > _IOC_SIZE(cmd)) |
|
len = _IOC_SIZE(cmd); |
|
r = copy_to_user(user_arg, hid->name, len) ? |
|
-EFAULT : len; |
|
break; |
|
} |
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) { |
|
int len = strlen(hid->phys) + 1; |
|
if (len > _IOC_SIZE(cmd)) |
|
len = _IOC_SIZE(cmd); |
|
r = copy_to_user(user_arg, hid->phys, len) ? |
|
-EFAULT : len; |
|
break; |
|
} |
|
} |
|
|
|
ret_unlock: |
|
mutex_unlock(&hiddev->existancelock); |
|
return r; |
|
} |
|
|
|
static const struct file_operations hiddev_fops = { |
|
.owner = THIS_MODULE, |
|
.read = hiddev_read, |
|
.write = hiddev_write, |
|
.poll = hiddev_poll, |
|
.open = hiddev_open, |
|
.release = hiddev_release, |
|
.unlocked_ioctl = hiddev_ioctl, |
|
.fasync = hiddev_fasync, |
|
.compat_ioctl = compat_ptr_ioctl, |
|
.llseek = noop_llseek, |
|
}; |
|
|
|
static char *hiddev_devnode(struct device *dev, umode_t *mode) |
|
{ |
|
return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); |
|
} |
|
|
|
static struct usb_class_driver hiddev_class = { |
|
.name = "hiddev%d", |
|
.devnode = hiddev_devnode, |
|
.fops = &hiddev_fops, |
|
.minor_base = HIDDEV_MINOR_BASE, |
|
}; |
|
|
|
/* |
|
* This is where hid.c calls us to connect a hid device to the hiddev driver |
|
*/ |
|
int hiddev_connect(struct hid_device *hid, unsigned int force) |
|
{ |
|
struct hiddev *hiddev; |
|
struct usbhid_device *usbhid = hid->driver_data; |
|
int retval; |
|
|
|
if (!force) { |
|
unsigned int i; |
|
for (i = 0; i < hid->maxcollection; i++) |
|
if (hid->collection[i].type == |
|
HID_COLLECTION_APPLICATION && |
|
!IS_INPUT_APPLICATION(hid->collection[i].usage)) |
|
break; |
|
|
|
if (i == hid->maxcollection) |
|
return -1; |
|
} |
|
|
|
if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL))) |
|
return -1; |
|
|
|
init_waitqueue_head(&hiddev->wait); |
|
INIT_LIST_HEAD(&hiddev->list); |
|
spin_lock_init(&hiddev->list_lock); |
|
mutex_init(&hiddev->existancelock); |
|
hid->hiddev = hiddev; |
|
hiddev->hid = hid; |
|
hiddev->exist = 1; |
|
retval = usb_register_dev(usbhid->intf, &hiddev_class); |
|
if (retval) { |
|
hid_err(hid, "Not able to get a minor for this device\n"); |
|
hid->hiddev = NULL; |
|
kfree(hiddev); |
|
return -1; |
|
} |
|
|
|
/* |
|
* If HID_QUIRK_NO_INIT_REPORTS is set, make sure we don't initialize |
|
* the reports. |
|
*/ |
|
hiddev->initialized = hid->quirks & HID_QUIRK_NO_INIT_REPORTS; |
|
|
|
hiddev->minor = usbhid->intf->minor; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* This is where hid.c calls us to disconnect a hiddev device from the |
|
* corresponding hid device (usually because the usb device has disconnected) |
|
*/ |
|
static struct usb_class_driver hiddev_class; |
|
void hiddev_disconnect(struct hid_device *hid) |
|
{ |
|
struct hiddev *hiddev = hid->hiddev; |
|
struct usbhid_device *usbhid = hid->driver_data; |
|
|
|
usb_deregister_dev(usbhid->intf, &hiddev_class); |
|
|
|
mutex_lock(&hiddev->existancelock); |
|
hiddev->exist = 0; |
|
|
|
if (hiddev->open) { |
|
hid_hw_close(hiddev->hid); |
|
wake_up_interruptible(&hiddev->wait); |
|
mutex_unlock(&hiddev->existancelock); |
|
} else { |
|
mutex_unlock(&hiddev->existancelock); |
|
kfree(hiddev); |
|
} |
|
}
|
|
|