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Merge branch 'uhid' into for-linus

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Conflicts:
	drivers/hid/Kconfig
tirimbino
Jiri Kosina 13 years ago
parent 929bd380b7 adefb69b1b
commit c062c4d1de
9 changed files with 1266 additions and 0 deletions
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  1. 169
      Documentation/hid/uhid.txt
  2. 7
      MAINTAINERS
  3. 21
      drivers/hid/Kconfig
  4. 1
      drivers/hid/Makefile
  5. 572
      drivers/hid/uhid.c
  6. 1
      include/linux/Kbuild
  7. 104
      include/linux/uhid.h
  8. 10
      samples/uhid/Makefile
  9. 381
      samples/uhid/uhid-example.c

169
Documentation/hid/uhid.txt
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@ -0,0 +1,169 @@
UHID - User-space I/O driver support for HID subsystem
========================================================
The HID subsystem needs two kinds of drivers. In this document we call them:
1. The "HID I/O Driver" is the driver that performs raw data I/O to the
low-level device. Internally, they register an hid_ll_driver structure with
the HID core. They perform device setup, read raw data from the device and
push it into the HID subsystem and they provide a callback so the HID
subsystem can send data to the device.
2. The "HID Device Driver" is the driver that parses HID reports and reacts on
them. There are generic drivers like "generic-usb" and "generic-bluetooth"
which adhere to the HID specification and provide the standardizes features.
But there may be special drivers and quirks for each non-standard device out
there. Internally, they use the hid_driver structure.
Historically, the USB stack was the first subsystem to provide an HID I/O
Driver. However, other standards like Bluetooth have adopted the HID specs and
may provide HID I/O Drivers, too. The UHID driver allows to implement HID I/O
Drivers in user-space and feed the data into the kernel HID-subsystem.
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.
There is an example user-space application in ./samples/uhid/uhid-example.c
The UHID API
------------
UHID is accessed through a character misc-device. The minor-number is allocated
dynamically so you need to rely on udev (or similar) to create the device node.
This is /dev/uhid by default.
If a new device is detected by your HID I/O Driver and you want to register this
device with the HID subsystem, then you need to open /dev/uhid once for each
device you want to register. All further communication is done by read()'ing or
write()'ing "struct uhid_event" objects. Non-blocking operations are supported
by setting O_NONBLOCK.
struct uhid_event {
__u32 type;
union {
struct uhid_create_req create;
struct uhid_data_req data;
...
} u;
};
The "type" field contains the ID of the event. Depending on the ID different
payloads are sent. You must not split a single event across multiple read()'s or
multiple write()'s. A single event must always be sent as a whole. Furthermore,
only a single event can be sent per read() or write(). Pending data is ignored.
If you want to handle multiple events in a single syscall, then use vectored
I/O with readv()/writev().
The first thing you should do is sending an UHID_CREATE event. This will
register the device. UHID will respond with an UHID_START event. You can now
start sending data to and reading data from UHID. However, unless UHID sends the
UHID_OPEN event, the internally attached HID Device Driver has no user attached.
That is, you might put your device asleep unless you receive the UHID_OPEN
event. If you receive the UHID_OPEN event, you should start I/O. If the last
user closes the HID device, you will receive an UHID_CLOSE event. This may be
followed by an UHID_OPEN event again and so on. There is no need to perform
reference-counting in user-space. That is, you will never receive multiple
UHID_OPEN events without an UHID_CLOSE event. The HID subsystem performs
ref-counting for you.
You may decide to ignore UHID_OPEN/UHID_CLOSE, though. I/O is allowed even
though the device may have no users.
If you want to send data to the HID subsystem, you send an HID_INPUT event with
your raw data payload. If the kernel wants to send data to the device, you will
read an UHID_OUTPUT or UHID_OUTPUT_EV event.
If your device disconnects, you should send an UHID_DESTROY event. This will
unregister the device. You can now send UHID_CREATE again to register a new
device.
If you close() the fd, the device is automatically unregistered and destroyed
internally.
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. The kernel will parse the event immediately and if the event ID is
not supported, it will return -EOPNOTSUPP. If the payload is invalid, then
-EINVAL is returned, otherwise, the amount of data that was read is returned and
the request was handled successfully.
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. You can start I/O now.
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.
UHID_FEATURE_ANSWER:
If you receive a UHID_FEATURE request you must answer with this request. You
must copy the "id" field from the request into the answer. Set the "err" field
to 0 if no error occured or to EIO if an I/O error occurred.
If "err" is 0 then you should fill the buffer of the answer with the results
of the feature request and set "size" correspondingly.
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.
UHID_STOP:
This is sent when the HID device is stopped. Consider this as an answer to
UHID_DESTROY.
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. This is
always the last message that is sent to you unless you reopen the device with
UHID_CREATE.
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.
UHID_FEATURE:
This event is sent if the kernel driver wants to perform a feature request as
described in the HID specs. The report-type and report-number are available in
the payload.
The kernel serializes feature requests so there will never be two in parallel.
However, if you fail to respond with a UHID_FEATURE_ANSWER in a time-span of 5
seconds, then the requests will be dropped and a new one might be sent.
Therefore, the payload also contains an "id" field that identifies every
request.
Document by:
David Herrmann <dh.herrmann@googlemail.com>

7
MAINTAINERS
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@ -6948,6 +6948,13 @@ S: Maintained
F: Documentation/filesystems/ufs.txt
F: fs/ufs/
UHID USERSPACE HID IO DRIVER:
M: David Herrmann <dh.herrmann@googlemail.com>
L: linux-input@vger.kernel.org
S: Maintained
F: drivers/hid/uhid.c
F: include/linux/uhid.h
ULTRA-WIDEBAND (UWB) SUBSYSTEM:
L: linux-usb@vger.kernel.org
S: Orphan

21
drivers/hid/Kconfig
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@ -53,6 +53,27 @@ 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.
config HID_GENERIC
tristate "Generic HID driver"
depends on HID

1
drivers/hid/Makefile
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@ -8,6 +8,7 @@ ifdef CONFIG_DEBUG_FS
endif
obj-$(CONFIG_HID) += hid.o
obj-$(CONFIG_UHID) += uhid.o
obj-$(CONFIG_HID_GENERIC) += hid-generic.o

572
drivers/hid/uhid.c
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/*
* 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/atomic.h>
#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
struct uhid_device {
struct mutex devlock;
bool running;
__u8 *rd_data;
uint rd_size;
struct hid_device *hid;
struct uhid_event input_buf;
wait_queue_head_t waitq;
spinlock_t qlock;
__u8 head;
__u8 tail;
struct uhid_event *outq[UHID_BUFSIZE];
struct mutex report_lock;
wait_queue_head_t report_wait;
atomic_t report_done;
atomic_t report_id;
struct uhid_event report_buf;
};
static struct miscdevice uhid_misc;
static void uhid_queue(struct uhid_device *uhid, struct uhid_event *ev)
{
__u8 newhead;
newhead = (uhid->head + 1) % UHID_BUFSIZE;
if (newhead != uhid->tail) {
uhid->outq[uhid->head] = ev;
uhid->head = newhead;
wake_up_interruptible(&uhid->waitq);
} else {
hid_warn(uhid->hid, "Output queue is full\n");
kfree(ev);
}
}
static int uhid_queue_event(struct uhid_device *uhid, __u32 event)
{
unsigned long flags;
struct uhid_event *ev;
ev = kzalloc(sizeof(*ev), GFP_KERNEL);
if (!ev)
return -ENOMEM;
ev->type = event;
spin_lock_irqsave(&uhid->qlock, flags);
uhid_queue(uhid, ev);
spin_unlock_irqrestore(&uhid->qlock, flags);
return 0;
}
static int uhid_hid_start(struct hid_device *hid)
{
struct uhid_device *uhid = hid->driver_data;
return uhid_queue_event(uhid, UHID_START);
}
static void uhid_hid_stop(struct hid_device *hid)
{
struct uhid_device *uhid = hid->driver_data;
hid->claimed = 0;
uhid_queue_event(uhid, UHID_STOP);
}
static int uhid_hid_open(struct hid_device *hid)
{
struct uhid_device *uhid = hid->driver_data;
return uhid_queue_event(uhid, UHID_OPEN);
}
static void uhid_hid_close(struct hid_device *hid)
{
struct uhid_device *uhid = hid->driver_data;
uhid_queue_event(uhid, UHID_CLOSE);
}
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;
struct uhid_event *ev;
ev = kzalloc(sizeof(*ev), GFP_ATOMIC);
if (!ev)
return -ENOMEM;
ev->type = UHID_OUTPUT_EV;
ev->u.output_ev.type = type;
ev->u.output_ev.code = code;
ev->u.output_ev.value = value;
spin_lock_irqsave(&uhid->qlock, flags);
uhid_queue(uhid, ev);
spin_unlock_irqrestore(&uhid->qlock, flags);
return 0;
}
static int uhid_hid_parse(struct hid_device *hid)
{
struct uhid_device *uhid = hid->driver_data;
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;
__u8 report_type;
struct uhid_event *ev;
unsigned long flags;
int ret;
size_t uninitialized_var(len);
struct uhid_feature_answer_req *req;
if (!uhid->running)
return -EIO;
switch (rtype) {
case HID_FEATURE_REPORT:
report_type = UHID_FEATURE_REPORT;
break;
case HID_OUTPUT_REPORT:
report_type = UHID_OUTPUT_REPORT;
break;
case HID_INPUT_REPORT:
report_type = UHID_INPUT_REPORT;
break;
default:
return -EINVAL;
}
ret = mutex_lock_interruptible(&uhid->report_lock);
if (ret)
return ret;
ev = kzalloc(sizeof(*ev), GFP_KERNEL);
if (!ev) {
ret = -ENOMEM;
goto unlock;
}
spin_lock_irqsave(&uhid->qlock, flags);
ev->type = UHID_FEATURE;
ev->u.feature.id = atomic_inc_return(&uhid->report_id);
ev->u.feature.rnum = rnum;
ev->u.feature.rtype = report_type;
atomic_set(&uhid->report_done, 0);
uhid_queue(uhid, ev);
spin_unlock_irqrestore(&uhid->qlock, flags);
ret = wait_event_interruptible_timeout(uhid->report_wait,
atomic_read(&uhid->report_done), 5 * HZ);
/*
* Make sure "uhid->running" is cleared on shutdown before
* "uhid->report_done" is set.
*/
smp_rmb();
if (!ret || !uhid->running) {
ret = -EIO;
} else if (ret < 0) {
ret = -ERESTARTSYS;
} else {
spin_lock_irqsave(&uhid->qlock, flags);
req = &uhid->report_buf.u.feature_answer;
if (req->err) {
ret = -EIO;
} else {
ret = 0;
len = min(count,
min_t(size_t, req->size, UHID_DATA_MAX));
memcpy(buf, req->data, len);
}
spin_unlock_irqrestore(&uhid->qlock, flags);
}
atomic_set(&uhid->report_done, 1);
unlock:
mutex_unlock(&uhid->report_lock);
return ret ? ret : len;
}
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;
struct uhid_event *ev;
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;
ev = kzalloc(sizeof(*ev), GFP_KERNEL);
if (!ev)
return -ENOMEM;
ev->type = UHID_OUTPUT;
ev->u.output.size = count;
ev->u.output.rtype = rtype;
memcpy(ev->u.output.data, buf, count);
spin_lock_irqsave(&uhid->qlock, flags);
uhid_queue(uhid, ev);
spin_unlock_irqrestore(&uhid->qlock, flags);
return count;
}
static struct hid_ll_driver uhid_hid_driver = {
.start = uhid_hid_start,
.stop = uhid_hid_stop,
.open = uhid_hid_open,
.close = uhid_hid_close,
.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;
if (uhid->running)
return -EALREADY;
uhid->rd_size = ev->u.create.rd_size;
if (uhid->rd_size <= 0 || uhid->rd_size > HID_MAX_DESCRIPTOR_SIZE)
return -EINVAL;
uhid->rd_data = kmalloc(uhid->rd_size, GFP_KERNEL);
if (!uhid->rd_data)
return -ENOMEM;
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, 127);
hid->name[127] = 0;
strncpy(hid->phys, ev->u.create.phys, 63);
hid->phys[63] = 0;
strncpy(hid->uniq, ev->u.create.uniq, 63);
hid->uniq[63] = 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 = ev->u.create.bus;
hid->vendor = ev->u.create.vendor;
hid->product = ev->u.create.product;
hid->version = ev->u.create.version;
hid->country = ev->u.create.country;
hid->driver_data = uhid;
hid->dev.parent = uhid_misc.this_device;
uhid->hid = hid;
uhid->running = true;
ret = hid_add_device(hid);
if (ret) {
hid_err(hid, "Cannot register HID device\n");
goto err_hid;
}
return 0;
err_hid:
hid_destroy_device(hid);
uhid->hid = NULL;
uhid->running = false;
err_free:
kfree(uhid->rd_data);
return ret;
}
static int uhid_dev_destroy(struct uhid_device *uhid)
{
if (!uhid->running)
return -EINVAL;
/* clear "running" before setting "report_done" */
uhid->running = false;
smp_wmb();
atomic_set(&uhid->report_done, 1);
wake_up_interruptible(&uhid->report_wait);
hid_destroy_device(uhid->hid);
kfree(uhid->rd_data);
return 0;
}
static int uhid_dev_input(struct uhid_device *uhid, struct uhid_event *ev)
{
if (!uhid->running)
return -EINVAL;
hid_input_report(uhid->hid, HID_INPUT_REPORT, ev->u.input.data,
min_t(size_t, ev->u.input.size, UHID_DATA_MAX), 0);
return 0;
}
static int uhid_dev_feature_answer(struct uhid_device *uhid,
struct uhid_event *ev)
{
unsigned long flags;
if (!uhid->running)
return -EINVAL;
spin_lock_irqsave(&uhid->qlock, flags);
/* id for old report; drop it silently */
if (atomic_read(&uhid->report_id) != ev->u.feature_answer.id)
goto unlock;
if (atomic_read(&uhid->report_done))
goto unlock;
memcpy(&uhid->report_buf, ev, sizeof(*ev));
atomic_set(&uhid->report_done, 1);
wake_up_interruptible(&uhid->report_wait);
unlock:
spin_unlock_irqrestore(&uhid->qlock, flags);
return 0;
}
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);
mutex_init(&uhid->report_lock);
spin_lock_init(&uhid->qlock);
init_waitqueue_head(&uhid->waitq);
init_waitqueue_head(&uhid->report_wait);
uhid->running = false;
atomic_set(&uhid->report_done, 1);
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;
unsigned int i;
uhid_dev_destroy(uhid);
for (i = 0; i < UHID_BUFSIZE; ++i)
kfree(uhid->outq[i]);
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;
unsigned long flags;
size_t len;
/* they 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;
}
ret = mutex_lock_interruptible(&uhid->devlock);
if (ret)
return ret;
if (uhid->head == uhid->tail) {
mutex_unlock(&uhid->devlock);
goto try_again;
} else {
len = min(count, sizeof(**uhid->outq));
if (copy_to_user(buffer, uhid->outq[uhid->tail], len)) {
ret = -EFAULT;
} else {
kfree(uhid->outq[uhid->tail]);
uhid->outq[uhid->tail] = NULL;
spin_lock_irqsave(&uhid->qlock, flags);
uhid->tail = (uhid->tail + 1) % UHID_BUFSIZE;
spin_unlock_irqrestore(&uhid->qlock, flags);
}
}
mutex_unlock(&uhid->devlock);
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;
size_t len;
/* we need at least the "type" member of uhid_event */
if (count < sizeof(__u32))
return -EINVAL;
ret = mutex_lock_interruptible(&uhid->devlock);
if (ret)
return ret;
memset(&uhid->input_buf, 0, sizeof(uhid->input_buf));
len = min(count, sizeof(uhid->input_buf));
if (copy_from_user(&uhid->input_buf, buffer, len)) {
ret = -EFAULT;
goto unlock;
}
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;
case UHID_FEATURE_ANSWER:
ret = uhid_dev_feature_answer(uhid, &uhid->input_buf);
break;
default:
ret = -EOPNOTSUPP;
}
unlock:
mutex_unlock(&uhid->devlock);
/* return "count" not "len" to not confuse the caller */
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@gmail.com>");
MODULE_DESCRIPTION("User-space I/O driver support for HID subsystem");

1
include/linux/Kbuild
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@ -376,6 +376,7 @@ header-y += tty.h
header-y += types.h
header-y += udf_fs_i.h
header-y += udp.h
header-y += uhid.h
header-y += uinput.h
header-y += uio.h
header-y += ultrasound.h

104
include/linux/uhid.h
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@ -0,0 +1,104 @@
#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.
*/
/*
* Public header for user-space communication. We try to keep every structure
* aligned but to be safe we also use __attribute__((__packed__)). Therefore,
* the communication should be ABI compatible even between architectures.
*/
#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,
UHID_FEATURE,
UHID_FEATURE_ANSWER,
};
struct uhid_create_req {
__u8 name[128];
__u8 phys[64];
__u8 uniq[64];
__u8 __user *rd_data;
__u16 rd_size;
__u16 bus;
__u32 vendor;
__u32 product;
__u32 version;
__u32 country;
} __attribute__((__packed__));
#define UHID_DATA_MAX 4096
enum uhid_report_type {
UHID_FEATURE_REPORT,
UHID_OUTPUT_REPORT,
UHID_INPUT_REPORT,
};
struct uhid_input_req {
__u8 data[UHID_DATA_MAX];
__u16 size;
} __attribute__((__packed__));
struct uhid_output_req {
__u8 data[UHID_DATA_MAX];
__u16 size;
__u8 rtype;
} __attribute__((__packed__));
struct uhid_output_ev_req {
__u16 type;
__u16 code;
__s32 value;
} __attribute__((__packed__));
struct uhid_feature_req {
__u32 id;
__u8 rnum;
__u8 rtype;
} __attribute__((__packed__));
struct uhid_feature_answer_req {
__u32 id;
__u16 err;
__u16 size;
__u8 data[UHID_DATA_MAX];
};
struct uhid_event {
__u32 type;
union {
struct uhid_create_req create;
struct uhid_input_req input;
struct uhid_output_req output;
struct uhid_output_ev_req output_ev;
struct uhid_feature_req feature;
struct uhid_feature_answer_req feature_answer;
} u;
} __attribute__((__packed__));
#endif /* __UHID_H_ */

10
samples/uhid/Makefile
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@ -0,0 +1,10 @@
# kbuild trick to avoid linker error. Can be omitted if a module is built.
obj- := dummy.o
# List of programs to build
hostprogs-y := uhid-example
# Tell kbuild to always build the programs
always := $(hostprogs-y)
HOSTCFLAGS_uhid-example.o += -I$(objtree)/usr/include

381
samples/uhid/uhid-example.c
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@ -0,0 +1,381 @@
/*
* UHID Example
*
* Copyright (c) 2012 David Herrmann <dh.herrmann@googlemail.com>
*
* The code may be used by anyone for any purpose,
* and can serve as a starting point for developing
* applications using uhid.
*/
/* UHID Example
* This example emulates a basic 3 buttons mouse with wheel over UHID. Run this
* program as root and then use the following keys to control the mouse:
* q: Quit the application
* 1: Toggle left button (down, up, ...)
* 2: Toggle right button
* 3: Toggle middle button
* a: Move mouse left
* d: Move mouse right
* w: Move mouse up
* s: Move mouse down
* r: Move wheel up
* f: Move wheel down
*
* If uhid is not available as /dev/uhid, then you can pass a different path as
* first argument.
* If <linux/uhid.h> is not installed in /usr, then compile this with:
* gcc -o ./uhid_test -Wall -I./include ./samples/uhid/uhid-example.c
* And ignore the warning about kernel headers. However, it is recommended to
* use the installed uhid.h if available.
*/
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <linux/uhid.h>
/* HID Report Desciptor
* We emulate a basic 3 button mouse with wheel. This is the report-descriptor
* as the kernel will parse it:
*
* INPUT[INPUT]
* Field(0)
* Physical(GenericDesktop.Pointer)
* Application(GenericDesktop.Mouse)
* Usage(3)
* Button.0001
* Button.0002
* Button.0003
* Logical Minimum(0)
* Logical Maximum(1)
* Report Size(1)
* Report Count(3)
* Report Offset(0)
* Flags( Variable Absolute )
* Field(1)
* Physical(GenericDesktop.Pointer)
* Application(GenericDesktop.Mouse)
* Usage(3)
* GenericDesktop.X
* GenericDesktop.Y
* GenericDesktop.Wheel
* Logical Minimum(-128)
* Logical Maximum(127)
* Report Size(8)
* Report Count(3)
* Report Offset(8)
* Flags( Variable Relative )
*
* This is the mapping that we expect:
* Button.0001 ---> Key.LeftBtn
* Button.0002 ---> Key.RightBtn
* Button.0003 ---> Key.MiddleBtn
* GenericDesktop.X ---> Relative.X
* GenericDesktop.Y ---> Relative.Y
* GenericDesktop.Wheel ---> Relative.Wheel
*
* This information can be verified by reading /sys/kernel/debug/hid/<dev>/rdesc
* This file should print the same information as showed above.
*/
static unsigned char rdesc[] = {
0x05, 0x01, 0x09, 0x02, 0xa1, 0x01, 0x09, 0x01,
0xa1, 0x00, 0x05, 0x09, 0x19, 0x01, 0x29, 0x03,
0x15, 0x00, 0x25, 0x01, 0x95, 0x03, 0x75, 0x01,
0x81, 0x02, 0x95, 0x01, 0x75, 0x05, 0x81, 0x01,
0x05, 0x01, 0x09, 0x30, 0x09, 0x31, 0x09, 0x38,
0x15, 0x80, 0x25, 0x7f, 0x75, 0x08, 0x95, 0x03,
0x81, 0x06, 0xc0, 0xc0,
};
static int uhid_write(int fd, const struct uhid_event *ev)
{
ssize_t ret;
ret = write(fd, ev, sizeof(*ev));
if (ret < 0) {
fprintf(stderr, "Cannot write to uhid: %m\n");
return -errno;
} else if (ret != sizeof(*ev)) {
fprintf(stderr, "Wrong size written to uhid: %ld != %lu\n",
ret, sizeof(ev));
return -EFAULT;
} else {
return 0;
}
}
static int create(int fd)
{
struct uhid_event ev;
memset(&ev, 0, sizeof(ev));
ev.type = UHID_CREATE;
strcpy((char*)ev.u.create.name, "test-uhid-device");
ev.u.create.rd_data = rdesc;
ev.u.create.rd_size = sizeof(rdesc);
ev.u.create.bus = BUS_USB;
ev.u.create.vendor = 0x15d9;
ev.u.create.product = 0x0a37;
ev.u.create.version = 0;
ev.u.create.country = 0;
return uhid_write(fd, &ev);
}
static void destroy(int fd)
{
struct uhid_event ev;
memset(&ev, 0, sizeof(ev));
ev.type = UHID_DESTROY;
uhid_write(fd, &ev);
}
static int event(int fd)
{
struct uhid_event ev;
ssize_t ret;
memset(&ev, 0, sizeof(ev));
ret = read(fd, &ev, sizeof(ev));
if (ret == 0) {
fprintf(stderr, "Read HUP on uhid-cdev\n");
return -EFAULT;
} else if (ret < 0) {
fprintf(stderr, "Cannot read uhid-cdev: %m\n");
return -errno;
} else if (ret != sizeof(ev)) {
fprintf(stderr, "Invalid size read from uhid-dev: %ld != %lu\n",
ret, sizeof(ev));
return -EFAULT;
}
switch (ev.type) {
case UHID_START:
fprintf(stderr, "UHID_START from uhid-dev\n");
break;
case UHID_STOP:
fprintf(stderr, "UHID_STOP from uhid-dev\n");
break;
case UHID_OPEN:
fprintf(stderr, "UHID_OPEN from uhid-dev\n");
break;
case UHID_CLOSE:
fprintf(stderr, "UHID_CLOSE from uhid-dev\n");
break;
case UHID_OUTPUT:
fprintf(stderr, "UHID_OUTPUT from uhid-dev\n");
break;
case UHID_OUTPUT_EV:
fprintf(stderr, "UHID_OUTPUT_EV from uhid-dev\n");
break;
default:
fprintf(stderr, "Invalid event from uhid-dev: %u\n", ev.type);
}
return 0;
}
static bool btn1_down;
static bool btn2_down;
static bool btn3_down;
static signed char abs_hor;
static signed char abs_ver;
static signed char wheel;
static int send_event(int fd)
{
struct uhid_event ev;
memset(&ev, 0, sizeof(ev));
ev.type = UHID_INPUT;
ev.u.input.size = 4;
if (btn1_down)
ev.u.input.data[0] |= 0x1;
if (btn2_down)
ev.u.input.data[0] |= 0x2;
if (btn3_down)
ev.u.input.data[0] |= 0x4;
ev.u.input.data[1] = abs_hor;
ev.u.input.data[2] = abs_ver;
ev.u.input.data[3] = wheel;
return uhid_write(fd, &ev);
}
static int keyboard(int fd)
{
char buf[128];
ssize_t ret, i;
ret = read(STDIN_FILENO, buf, sizeof(buf));
if (ret == 0) {
fprintf(stderr, "Read HUP on stdin\n");
return -EFAULT;
} else if (ret < 0) {
fprintf(stderr, "Cannot read stdin: %m\n");
return -errno;
}
for (i = 0; i < ret; ++i) {
switch (buf[i]) {
case '1':
btn1_down = !btn1_down;
ret = send_event(fd);
if (ret)
return ret;
break;
case '2':
btn2_down = !btn2_down;
ret = send_event(fd);
if (ret)
return ret;
break;
case '3':
btn3_down = !btn3_down;
ret = send_event(fd);
if (ret)
return ret;
break;
case 'a':
abs_hor = -20;
ret = send_event(fd);
abs_hor = 0;
if (ret)
return ret;
break;
case 'd':
abs_hor = 20;
ret = send_event(fd);
abs_hor = 0;
if (ret)
return ret;
break;
case 'w':
abs_ver = -20;
ret = send_event(fd);
abs_ver = 0;
if (ret)
return ret;
break;
case 's':
abs_ver = 20;
ret = send_event(fd);
abs_ver = 0;
if (ret)
return ret;
break;
case 'r':
wheel = 1;
ret = send_event(fd);
wheel = 0;
if (ret)
return ret;
break;
case 'f':
wheel = -1;
ret = send_event(fd);
wheel = 0;
if (ret)
return ret;
break;
case 'q':
return -ECANCELED;
default:
fprintf(stderr, "Invalid input: %c\n", buf[i]);
}
}
return 0;
}
int main(int argc, char **argv)
{
int fd;
const char *path = "/dev/uhid";
struct pollfd pfds[2];
int ret;
struct termios state;
ret = tcgetattr(STDIN_FILENO, &state);
if (ret) {
fprintf(stderr, "Cannot get tty state\n");
} else {
state.c_lflag &= ~ICANON;
state.c_cc[VMIN] = 1;
ret = tcsetattr(STDIN_FILENO, TCSANOW, &state);
if (ret)
fprintf(stderr, "Cannot set tty state\n");
}
if (argc >= 2) {
if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")) {
fprintf(stderr, "Usage: %s [%s]\n", argv[0], path);
return EXIT_SUCCESS;
} else {
path = argv[1];
}
}
fprintf(stderr, "Open uhid-cdev %s\n", path);
fd = open(path, O_RDWR | O_CLOEXEC);
if (fd < 0) {
fprintf(stderr, "Cannot open uhid-cdev %s: %m\n", path);
return EXIT_FAILURE;
}
fprintf(stderr, "Create uhid device\n");
ret = create(fd);
if (ret) {
close(fd);
return EXIT_FAILURE;
}
pfds[0].fd = STDIN_FILENO;
pfds[0].events = POLLIN;
pfds[1].fd = fd;
pfds[1].events = POLLIN;
fprintf(stderr, "Press 'q' to quit...\n");
while (1) {
ret = poll(pfds, 2, -1);
if (ret < 0) {
fprintf(stderr, "Cannot poll for fds: %m\n");
break;
}
if (pfds[0].revents & POLLHUP) {
fprintf(stderr, "Received HUP on stdin\n");
break;
}
if (pfds[1].revents & POLLHUP) {
fprintf(stderr, "Received HUP on uhid-cdev\n");
break;
}
if (pfds[0].revents & POLLIN) {
ret = keyboard(fd);
if (ret)
break;
}
if (pfds[1].revents & POLLIN) {
ret = event(fd);
if (ret)
break;
}
}
fprintf(stderr, "Destroy uhid device\n");
destroy(fd);
return EXIT_SUCCESS;
}
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