Hi David,
On Fri, Mar 16, 2012 at 11:53 AM, David Herrmann
<dh.herrmann@xxxxxxxxxxxxxx> wrote:
> This driver allows to write I/O drivers in user-space and feed the input
> into the HID subsystem. It operates on the same level as USB-HID and
> Bluetooth-HID (HIDP). It does not provide support to write special HID
> device drivers but rather provides support for user-space I/O devices to
> feed their data into the kernel HID subsystem. The HID subsystem then
> loads the HID device drivers for the device and provides input-devices
> based on the user-space HID I/O device.
>
> This driver register a new char-device (/dev/uhid). A user-space process
> has to open this file for each device that it wants to provide to the
> kernel. It can then use write/read to communicate with the UHID driver.
> Both input and output data is sent with a uhid_event structure. The "type"
> field of the structure specifies what kind of event is sent. There is a
> file in Documentation/ explaining the ABI.
>
> Signed-off-by: David Herrmann <dh.herrmann@xxxxxxxxxxxxxx>
> ---
> Documentation/hid/uhid.txt | 95 +++++++++
> drivers/hid/Kconfig | 21 ++
> drivers/hid/Makefile | 2 +-
> drivers/hid/uhid.c | 502 ++++++++++++++++++++++++++++++++++++++++++++
> include/linux/uhid.h | 71 +++++++
> 5 files changed, 690 insertions(+), 1 deletion(-)
> create mode 100644 Documentation/hid/uhid.txt
> create mode 100644 drivers/hid/uhid.c
> create mode 100644 include/linux/uhid.h
>
> diff --git a/Documentation/hid/uhid.txt b/Documentation/hid/uhid.txt
> new file mode 100644
> index 0000000..67b138d
> --- /dev/null
> +++ b/Documentation/hid/uhid.txt
> @@ -0,0 +1,95 @@
> + UHID - User-space I/O driver support for HID subsystem
> + ========================================================
> +
> +The UHID driver provides an interface for user-space I/O drivers to feed their
> +data into the HID subsystem. The HID subsystem then parses the HID reports and
> +loads the corresponding HID device driver which then provides the parsed data
> +via input-devices to user-space.
> +
> +This allows user-space to operate on the same level as USB-HID, Bluetooth-HID
> +and similar. It does not provide a way to write HID device drivers, though! Use
> +HIDRAW for this purpose.
> +
> +UHID dynamically allocates the minor/major number, meaning that you should rely
> +on udev to create the UHID device node. Typically this is created as /dev/uhid.
> +
> +The UHID API
> +------------
> +
> +For each device that you want to register with the HID core, you need to open a
> +separate file-descriptor on /dev/uhid. All communication is done by read()'ing
> +or write()'ing "struct uhid_event" objects to the file. Non-blocking operations
> +via O_NONBLOCK are supported.
> +
> +struct uhid_event {
> + __u32 type;
> + ... payload ...
> +};
> +
> +write()
> +-------
> +write() allows you to modify the state of the device and feed input data into
> +the kernel. The following types are supported: UHID_CREATE, UHID_DESTROY and
> +UHID_INPUT.
> +
> + UHID_CREATE:
> + This creates the internal HID device. No I/O is possible until you send this
> + event to the kernel. The payload is of type struct uhid_create_req and
> + contains information about your device.
> +
> + UHID_DESTROY:
> + This destroys the internal HID device. No further I/O will be accepted. There
> + may still be pending messages that you can receive with read() but no further
> + UHID_INPUT events can be sent to the kernel.
> + You can create a new device by sending UHID_CREATE again. There is no need to
> + reopen the character device.
> +
> + UHID_INPUT:
> + You must send UHID_CREATE before sending input to the kernel! This event
> + contains a data-payload. This is the raw data that you read from your device.
> + The kernel will parse the HID reports and react on it.
> +
> +read()
> +------
> +read() will return a queued ouput report. These output reports can be of type
> +UHID_START, UHID_STOP, UHID_OPEN, UHID_CLOSE, UHID_OUTPUT or UHID_OUTPUT_EV. No
> +reaction is required to any of them but you should handle them according to your
> +needs. Only UHID_OUTPUT and UHID_OUTPUT_EV have payloads.
> +
> + UHID_START:
> + This is sent when the HID device is started. Consider this as an answer to
> + UHID_CREATE. This is always the first event that is sent. No I/O is possible
> + before you read this.
> +
> + UHID_STOP:
> + This is sent when the HID device is stopped. Consider this as an answer to
> + UHID_DESTROY. No further I/O will be possible after receiving this.
> + If the kernel HID device driver closes the device manually (that is, you
> + didn't send UHID_DESTROY) then you should consider this device closed and send
> + an UHID_DESTROY event. You may want to reregister your device, though.
> +
> + UHID_OPEN:
> + This is sent when the HID device is opened. That is, the data that the HID
> + device provides is read by some other process. You may ignore this event but
> + it is useful for power-management. As long as you haven't received this event
> + there is actually no other process that reads your data so there is no need to
> + send UHID_INPUT events to the kernel.
> +
> + UHID_CLOSE:
> + This is sent when there are no more processes which read the HID data. It is
> + the counterpart of UHID_OPEN and you may as well ignore this event.
> +
> + UHID_OUTPUT:
> + This is sent if the HID device driver wants to send raw data to the I/O
> + device. You should read the payload and forward it to the device. The payload
> + is of type "struct uhid_data_req".
> + This may be received even though you haven't received UHID_OPEN, yet.
> +
> + UHID_OUTPUT_EV:
> + Same as UHID_OUTPUT but this contains a "struct input_event" as payload. This
> + is called for force-feedback, LED or similar events which are received through
> + an input device by the HID subsystem. You should convert this into raw reports
> + and send them to your device similar to events of type UHID_OUTPUT.
> +
> +Document by:
> + David Herrmann <dh.herrmann@xxxxxxxxxxxxxx>
What do you think about using ioctl() to handle creating, destroying
and configuring internal hid devices and leave read() and write() to
handle HID reports?
This way, at user-space, we wouldn't need to build uhid_event messages
for every HID report we get. We would just write() the HID report
right away.
> diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
> index 54cc92f..cabe771 100644
> --- a/drivers/hid/Kconfig
> +++ b/drivers/hid/Kconfig
> @@ -55,6 +55,27 @@ config HIDRAW
>
> If unsure, say Y.
>
> +config UHID
> + tristate "User-space I/O driver support for HID subsystem"
> + depends on HID
> + default n
> + ---help---
> + Say Y here if you want to provide HID I/O drivers from user-space.
> + This allows to write I/O drivers in user-space and feed the data from
> + the device into the kernel. The kernel parses the HID reports, loads the
> + corresponding HID device driver or provides input devices on top of your
> + user-space device.
> +
> + This driver cannot be used to parse HID-reports in user-space and write
> + special HID-drivers. You should use HIDRAW for that.
> + Instead, this driver allows to write the transport-layer driver in
> + user-space like USB-HID and Bluetooth-HID do in kernel-space.
> +
> + If unsure, say N.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called uhid.
> +
> source "drivers/hid/usbhid/Kconfig"
>
> menu "Special HID drivers"
> diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
> index 22f1d16..cadb84f 100644
> --- a/drivers/hid/Makefile
> +++ b/drivers/hid/Makefile
> @@ -8,6 +8,7 @@ ifdef CONFIG_DEBUG_FS
> endif
>
> obj-$(CONFIG_HID) += hid.o
> +obj-$(CONFIG_UHID) += uhid.o
>
> hid-$(CONFIG_HIDRAW) += hidraw.o
>
> @@ -88,4 +89,3 @@ obj-$(CONFIG_HID_WIIMOTE) += hid-wiimote.o
> obj-$(CONFIG_USB_HID) += usbhid/
> obj-$(CONFIG_USB_MOUSE) += usbhid/
> obj-$(CONFIG_USB_KBD) += usbhid/
> -
> diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
> new file mode 100644
> index 0000000..1bb16a7
> --- /dev/null
> +++ b/drivers/hid/uhid.c
> @@ -0,0 +1,502 @@
> +/*
> + * User-space I/O driver support for HID subsystem
> + * Copyright (c) 2012 David Herrmann
> + */
> +
> +/*
> + * 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.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/fs.h>
> +#include <linux/hid.h>
> +#include <linux/input.h>
> +#include <linux/miscdevice.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/poll.h>
> +#include <linux/sched.h>
> +#include <linux/spinlock.h>
> +#include <linux/uhid.h>
> +#include <linux/wait.h>
> +
> +#define UHID_NAME "uhid"
> +#define UHID_BUFSIZE 32
> +
> +enum uhid_state {
> + UHID_NEW,
> + UHID_RUNNING,
> +};
> +
> +struct uhid_device {
> + struct mutex devlock;
> + enum uhid_state state;
> + struct device *parent;
> +
> + __u8 *rd_data;
> + uint rd_size;
> +
> + struct hid_device *hid;
> + struct uhid_event input_buf;
> +
> + wait_queue_head_t waitq;
> + spinlock_t qlock;
> + struct uhid_event assemble;
> + __u8 head;
> + __u8 tail;
> + struct uhid_event outq[UHID_BUFSIZE];
> +};
> +
> +static void uhid_queue(struct uhid_device *uhid, const struct uhid_event *ev)
> +{
> + __u8 newhead;
> +
> + newhead = (uhid->head + 1) % UHID_BUFSIZE;
> +
> + if (newhead != uhid->tail) {
> + memcpy(&uhid->outq[uhid->head], ev, sizeof(struct uhid_event));
> + uhid->head = newhead;
> + wake_up_interruptible(&uhid->waitq);
> + } else {
> + pr_warn("Output queue is full\n");
> + }
> +}
> +
> +static int uhid_hid_start(struct hid_device *hid)
> +{
> + struct uhid_device *uhid = hid->driver_data;
> + unsigned long flags;
> +
> + if (uhid->state != UHID_RUNNING)
> + return -ENODEV;
> +
> + spin_lock_irqsave(&uhid->qlock, flags);
> + memset(&uhid->assemble, 0, sizeof(uhid->assemble));
> + uhid->assemble.type = UHID_START;
> + uhid_queue(uhid, &uhid->assemble);
> + spin_unlock_irqrestore(&uhid->qlock, flags);
> +
> + return 0;
> +}
> +
> +static void uhid_hid_stop(struct hid_device *hid)
> +{
> + struct uhid_device *uhid = hid->driver_data;
> + unsigned long flags;
> +
> + if (uhid->state != UHID_RUNNING)
> + return;
> +
> + spin_lock_irqsave(&uhid->qlock, flags);
> + memset(&uhid->assemble, 0, sizeof(uhid->assemble));
> + uhid->assemble.type = UHID_STOP;
> + uhid_queue(uhid, &uhid->assemble);
> + spin_unlock_irqrestore(&uhid->qlock, flags);
> +
> + hid->claimed = 0;
> +}
> +
> +static int uhid_hid_open(struct hid_device *hid)
> +{
> + struct uhid_device *uhid = hid->driver_data;
> + unsigned long flags;
> +
> + if (uhid->state != UHID_RUNNING)
> + return -ENODEV;
> +
> + spin_lock_irqsave(&uhid->qlock, flags);
> + memset(&uhid->assemble, 0, sizeof(uhid->assemble));
> + uhid->assemble.type = UHID_OPEN;
> + uhid_queue(uhid, &uhid->assemble);
> + spin_unlock_irqrestore(&uhid->qlock, flags);
> +
> + return 0;
> +}
> +
> +static void uhid_hid_close(struct hid_device *hid)
> +{
> + struct uhid_device *uhid = hid->driver_data;
> + unsigned long flags;
> +
> + if (uhid->state != UHID_RUNNING)
> + return;
> +
> + spin_lock_irqsave(&uhid->qlock, flags);
> + memset(&uhid->assemble, 0, sizeof(uhid->assemble));
> + uhid->assemble.type = UHID_CLOSE;
> + uhid_queue(uhid, &uhid->assemble);
> + spin_unlock_irqrestore(&uhid->qlock, flags);
> +}
> +
> +static int uhid_hid_power(struct hid_device *hid, int level)
> +{
> + struct uhid_device *uhid = hid->driver_data;
> +
> + /* TODO: Handle PM-hints. This isn't mandatory so we simply return 0
> + * here.
> + */
> +
> + if (uhid->state != UHID_RUNNING)
> + return -ENODEV;
> +
> + return 0;
> +}
> +
> +static int uhid_hid_input(struct input_dev *input, unsigned int type,
> + unsigned int code, int value)
> +{
> + struct hid_device *hid = input_get_drvdata(input);
> + struct uhid_device *uhid = hid->driver_data;
> + unsigned long flags;
> +
> + if (uhid->state != UHID_RUNNING)
> + return -ENODEV;
> +
> + spin_lock_irqsave(&uhid->qlock, flags);
> + memset(&uhid->assemble, 0, sizeof(uhid->assemble));
> +
> + uhid->assemble.type = UHID_OUTPUT_EV;
> + uhid->assemble.u.data_ev.type = type;
> + uhid->assemble.u.data_ev.code = code;
> + uhid->assemble.u.data_ev.value = value;
> +
> + uhid_queue(uhid, &uhid->assemble);
> + spin_unlock_irqrestore(&uhid->qlock, flags);
> +
> + return 0;
> +}
> +
> +static int uhid_hid_parse(struct hid_device *hid)
> +{
> + struct uhid_device *uhid = hid->driver_data;
> +
> + if (uhid->state != UHID_RUNNING)
> + return -ENODEV;
> +
> + return hid_parse_report(hid, uhid->rd_data, uhid->rd_size);
> +}
> +
> +static int uhid_hid_get_raw(struct hid_device *hid, unsigned char rnum,
> + __u8 *buf, size_t count, unsigned char rtype)
> +{
> + struct uhid_device *uhid = hid->driver_data;
> +
> + if (uhid->state != UHID_RUNNING)
> + return -ENODEV;
> +
> + /* TODO: we currently do not support this request. If we want this we
> + * would need some kind of stream-locking but it isn't needed by the
> + * main drivers, anyway.
> + */
> +
> + return -EOPNOTSUPP;
> +}
> +
> +static int uhid_hid_output_raw(struct hid_device *hid, __u8 *buf, size_t count,
> + unsigned char report_type)
> +{
> + struct uhid_device *uhid = hid->driver_data;
> + __u8 rtype;
> + unsigned long flags;
> +
> + switch (report_type) {
> + case HID_FEATURE_REPORT:
> + rtype = UHID_FEATURE_REPORT;
> + break;
> + case HID_OUTPUT_REPORT:
> + rtype = UHID_OUTPUT_REPORT;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + if (count < 1 || count > UHID_DATA_MAX)
> + return -EINVAL;
> +
> + if (uhid->state != UHID_RUNNING)
> + return -ENODEV;
> +
> + spin_lock_irqsave(&uhid->qlock, flags);
> + memset(&uhid->assemble, 0, sizeof(uhid->assemble));
> +
> + uhid->assemble.type = UHID_OUTPUT;
> + uhid->assemble.u.data.size = count;
> + uhid->assemble.u.data.rtype = rtype;
> + memcpy(uhid->assemble.u.data.data, buf, count);
> +
> + uhid_queue(uhid, &uhid->assemble);
> + spin_unlock_irqrestore(&uhid->qlock, flags);
> +
> + return 0;
> +}
> +
> +static struct hid_ll_driver uhid_hid_driver = {
> + .start = uhid_hid_start,
> + .stop = uhid_hid_stop,
> + .open = uhid_hid_open,
> + .close = uhid_hid_close,
> + .power = uhid_hid_power,
> + .hidinput_input_event = uhid_hid_input,
> + .parse = uhid_hid_parse,
> +};
> +
> +static int uhid_dev_create(struct uhid_device *uhid,
> + const struct uhid_event *ev)
> +{
> + struct hid_device *hid;
> + int ret;
> +
> + ret = mutex_lock_interruptible(&uhid->devlock);
> + if (ret)
> + return ret;
> +
> + if (uhid->state != UHID_NEW) {
> + ret = -EALREADY;
> + goto unlock;
> + }
> +
> + uhid->rd_size = ev->u.create.rd_size;
> + uhid->rd_data = kzalloc(uhid->rd_size, GFP_KERNEL);
> + if (!uhid->rd_data) {
> + ret = -ENOMEM;
> + goto unlock;
> + }
> +
> + if (copy_from_user(uhid->rd_data, ev->u.create.rd_data,
> + uhid->rd_size)) {
> + ret = -EFAULT;
> + goto err_free;
> + }
> +
> + hid = hid_allocate_device();
> + if (IS_ERR(hid)) {
> + ret = PTR_ERR(hid);
> + goto err_free;
> + }
> +
> + strncpy(hid->name, ev->u.create.name, 128);
> + hid->name[127] = 0;
> + hid->ll_driver = &uhid_hid_driver;
> + hid->hid_get_raw_report = uhid_hid_get_raw;
> + hid->hid_output_raw_report = uhid_hid_output_raw;
> + hid->bus = BUS_VIRTUAL;
> + hid->country = ev->u.create.country;
> + hid->vendor = ev->u.create.vendor;
> + hid->product = ev->u.create.product;
> + hid->version = ev->u.create.version;
> + hid->phys[0] = 0;
> + hid->uniq[0] = 0;
> + hid->driver_data = uhid;
> + hid->dev.parent = uhid->parent;
> +
> + ret = hid_add_device(hid);
> + if (ret) {
> + pr_err("Cannot register HID device\n");
> + goto err_hid;
> + }
> +
> + uhid->hid = hid;
> + uhid->state = UHID_RUNNING;
> + mutex_unlock(&uhid->devlock);
> +
> + return 0;
> +
> +err_hid:
> + hid_destroy_device(hid);
> +err_free:
> + kfree(uhid->rd_data);
> +unlock:
> + mutex_unlock(&uhid->devlock);
> + return ret;
> +}
> +
> +static int uhid_dev_destroy(struct uhid_device *uhid)
> +{
> + int ret;
> +
> + ret = mutex_lock_interruptible(&uhid->devlock);
> + if (ret)
> + return ret;
> +
> + if (uhid->state != UHID_RUNNING) {
> + ret = -EINVAL;
> + goto unlock;
> + }
> +
> + hid_destroy_device(uhid->hid);
> + kfree(uhid->rd_data);
> + uhid->state = UHID_NEW;
> +
> +unlock:
> + mutex_unlock(&uhid->devlock);
> + return ret;
> +}
> +
> +static int uhid_dev_input(struct uhid_device *uhid, struct uhid_event *ev)
> +{
> + int ret;
> +
> + ret = mutex_lock_interruptible(&uhid->devlock);
> + if (ret)
> + return ret;
> +
> + if (uhid->state != UHID_RUNNING) {
> + ret = -EINVAL;
> + goto unlock;
> + }
> +
> + hid_input_report(uhid->hid, HID_INPUT_REPORT, ev->u.data.data,
> + ev->u.data.size, 0);
> +
> +unlock:
> + mutex_unlock(&uhid->devlock);
> + return ret;
> +}
> +
> +static int uhid_char_open(struct inode *inode, struct file *file)
> +{
> + struct uhid_device *uhid;
> +
> + uhid = kzalloc(sizeof(*uhid), GFP_KERNEL);
> + if (!uhid)
> + return -ENOMEM;
> +
> + mutex_init(&uhid->devlock);
> + spin_lock_init(&uhid->qlock);
> + init_waitqueue_head(&uhid->waitq);
> + uhid->state = UHID_NEW;
> + uhid->parent = NULL;
> +
> + file->private_data = uhid;
> + nonseekable_open(inode, file);
> +
> + return 0;
> +}
> +
> +static int uhid_char_release(struct inode *inode, struct file *file)
> +{
> + struct uhid_device *uhid = file->private_data;
> +
> + uhid_dev_destroy(uhid);
> + kfree(uhid);
> +
> + return 0;
> +}
> +
> +static ssize_t uhid_char_read(struct file *file, char __user *buffer,
> + size_t count, loff_t *ppos)
> +{
> + struct uhid_device *uhid = file->private_data;
> + int ret = 0;
> + unsigned long flags;
> + size_t len;
> +
> + /* we need at least the "type" member of uhid_event */
> + if (count < sizeof(__u32))
> + return -EINVAL;
> +
> +try_again:
> + if (file->f_flags & O_NONBLOCK) {
> + if (uhid->head == uhid->tail)
> + return -EAGAIN;
> + } else {
> + ret = wait_event_interruptible(uhid->waitq,
> + uhid->head != uhid->tail);
> + if (ret)
> + return ret;
> + }
> +
> + spin_lock_irqsave(&uhid->qlock, flags);
> +
> + if (uhid->head != uhid->tail) {
> + len = min_t(size_t, count, sizeof(struct uhid_event));
> + if (copy_to_user(buffer, &uhid->outq[uhid->tail], len))
> + ret = -EFAULT;
> + else
> + uhid->tail = (uhid->tail + 1) % UHID_BUFSIZE;
> + spin_unlock_irqrestore(&uhid->qlock, flags);
> + } else {
> + spin_unlock_irqrestore(&uhid->qlock, flags);
> + goto try_again;
> + }
> +
> + return ret ? ret : len;
> +}
> +
> +static ssize_t uhid_char_write(struct file *file, const char __user *buffer,
> + size_t count, loff_t *ppos)
> +{
> + struct uhid_device *uhid = file->private_data;
> + int ret;
> +
> + /* we need at least the "type" member of uhid_event */
> + if (count < sizeof(__u32))
> + return -EINVAL;
> +
> + memset(&uhid->input_buf, 0, sizeof(uhid->input_buf));
> + if (copy_from_user(&uhid->input_buf, buffer, count))
> + return -EFAULT;
> +
> + switch (uhid->input_buf.type) {
> + case UHID_CREATE:
> + ret = uhid_dev_create(uhid, &uhid->input_buf);
> + break;
> + case UHID_DESTROY:
> + ret = uhid_dev_destroy(uhid);
> + break;
> + case UHID_INPUT:
> + ret = uhid_dev_input(uhid, &uhid->input_buf);
> + break;
> + default:
> + ret = -EINVAL;
> + }
> +
> + return ret ? ret : count;
> +}
> +
> +static unsigned int uhid_char_poll(struct file *file, poll_table *wait)
> +{
> + struct uhid_device *uhid = file->private_data;
> +
> + poll_wait(file, &uhid->waitq, wait);
> +
> + if (uhid->head != uhid->tail)
> + return POLLIN | POLLRDNORM;
> +
> + return 0;
> +}
> +
> +static const struct file_operations uhid_fops = {
> + .owner = THIS_MODULE,
> + .open = uhid_char_open,
> + .release = uhid_char_release,
> + .read = uhid_char_read,
> + .write = uhid_char_write,
> + .poll = uhid_char_poll,
> + .llseek = no_llseek,
> +};
> +
> +static struct miscdevice uhid_misc = {
> + .fops = &uhid_fops,
> + .minor = MISC_DYNAMIC_MINOR,
> + .name = UHID_NAME,
> +};
> +
> +static int __init uhid_init(void)
> +{
> + return misc_register(&uhid_misc);
> +}
> +
> +static void __exit uhid_exit(void)
> +{
> + misc_deregister(&uhid_misc);
> +}
> +
> +module_init(uhid_init);
> +module_exit(uhid_exit);
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("David Herrmann <dh.herrmann@xxxxxxxxx>");
> +MODULE_DESCRIPTION("User-space I/O driver support for HID subsystem");
> diff --git a/include/linux/uhid.h b/include/linux/uhid.h
> new file mode 100644
> index 0000000..1a7df0d
> --- /dev/null
> +++ b/include/linux/uhid.h
> @@ -0,0 +1,71 @@
> +#ifndef __UHID_H_
> +#define __UHID_H_
> +
> +/*
> + * User-space I/O driver support for HID subsystem
> + * Copyright (c) 2012 David Herrmann
> + */
> +
> +/*
> + * 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.
> + */
> +
> +#include <linux/input.h>
> +#include <linux/types.h>
> +
> +enum uhid_event_type {
> + UHID_CREATE,
> + UHID_DESTROY,
> + UHID_START,
> + UHID_STOP,
> + UHID_OPEN,
> + UHID_CLOSE,
> + UHID_OUTPUT,
> + UHID_OUTPUT_EV,
> + UHID_INPUT,
> +};
> +
> +struct uhid_create_req {
> + __u8 __user name[128];
> + __u8 __user *rd_data;
> + __u16 rd_size;
> +
> + __u16 vendor;
> + __u16 product;
> + __u16 version;
> + __u8 country;
> +};
> +
> +#define UHID_DATA_MAX 4096
> +
> +enum uhid_report_type {
> + UHID_FEATURE_REPORT,
> + UHID_OUTPUT_REPORT,
> +};
> +
> +struct uhid_data_req {
> + __u8 data[UHID_DATA_MAX];
> + __u16 size;
> + __u8 rtype;
> +};
> +
> +struct uhid_data_ev_req {
> + __u16 type;
> + __u16 code;
> + __s32 value;
> +};
> +
> +struct uhid_event {
> + __u32 type;
> +
> + union {
> + struct uhid_create_req create;
> + struct uhid_data_req data;
> + struct input_event data_ev;
> + } u;
> +};
> +
> +#endif /* __UHID_H_ */
> --
> 1.7.9.4
BR,
Andre
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