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uinput.c
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417 lines (322 loc) · 9.95 KB
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#include <Python.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#ifdef __FreeBSD__
#include <dev/evdev/input.h>
#include <dev/evdev/uinput.h>
#else
#include <linux/input.h>
#include <linux/uinput.h>
#endif
#ifndef input_event_sec
#define input_event_sec time.tv_sec
#define input_event_usec time.tv_usec
#endif
// Workaround for installing on kernels newer than 4.4.
#ifndef FF_MAX_EFFECTS
#define FF_MAX_EFFECTS FF_GAIN;
#endif
int _uinput_close(int fd)
{
if (ioctl(fd, UI_DEV_DESTROY) < 0) {
int oerrno = errno;
close(fd);
errno = oerrno;
return -1;
}
return close(fd);
}
static PyObject *
uinput_open(PyObject *self, PyObject *args)
{
const char* devnode;
int ret = PyArg_ParseTuple(args, "s", &devnode);
if (!ret) return NULL;
int fd = open(devnode, O_RDWR | O_NONBLOCK);
if (fd < 0) {
PyErr_SetString(PyExc_OSError, "could not open uinput device in write mode");
return NULL;
}
return Py_BuildValue("i", fd);
}
static PyObject *
uinput_set_phys(PyObject *self, PyObject *args)
{
int fd;
const char* phys;
int ret = PyArg_ParseTuple(args, "is", &fd, &phys);
if (!ret) return NULL;
if (ioctl(fd, UI_SET_PHYS, phys) < 0)
goto on_err;
Py_RETURN_NONE;
on_err:
_uinput_close(fd);
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
static PyObject *
uinput_set_prop(PyObject *self, PyObject *args)
{
int fd;
uint16_t prop;
int ret = PyArg_ParseTuple(args, "ih", &fd, &prop);
if (!ret) return NULL;
if (ioctl(fd, UI_SET_PROPBIT, prop) < 0)
goto on_err;
Py_RETURN_NONE;
on_err:
_uinput_close(fd);
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
static PyObject *
uinput_get_sysname(PyObject *self, PyObject *args)
{
int fd;
char sysname[64];
int ret = PyArg_ParseTuple(args, "i", &fd);
if (!ret) return NULL;
#ifdef UI_GET_SYSNAME
if (ioctl(fd, UI_GET_SYSNAME(sizeof(sysname)), &sysname) < 0)
goto on_err;
return Py_BuildValue("s", &sysname);
#endif
on_err:
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
// Different kernel versions have different device setup methods. You can read
// more about it here:
// https://github.com/torvalds/linux/commit/052876f8e5aec887d22c4d06e54aa5531ffcec75
// Setup function for kernel >= v4.5
#if defined(UI_DEV_SETUP) && defined(UI_ABS_SETUP)
static PyObject *
uinput_setup(PyObject *self, PyObject *args) {
int fd, len, i;
uint16_t vendor, product, version, bustype;
uint32_t max_effects;
PyObject *absinfo = NULL, *item = NULL;
struct uinput_abs_setup abs_setup;
const char* name;
int ret = PyArg_ParseTuple(args, "isHHHHOI", &fd, &name, &vendor,
&product, &version, &bustype, &absinfo, &max_effects);
if (!ret) return NULL;
// Setup absinfo:
len = PyList_Size(absinfo);
for (i=0; i<len; i++) {
// item -> (ABS_X, 0, 255, 0, 0, 0, 0)
item = PyList_GetItem(absinfo, i);
memset(&abs_setup, 0, sizeof(abs_setup)); // Clear struct
abs_setup.code = PyLong_AsLong(PyList_GetItem(item, 0));
abs_setup.absinfo.value = PyLong_AsLong(PyList_GetItem(item, 1));
abs_setup.absinfo.minimum = PyLong_AsLong(PyList_GetItem(item, 2));
abs_setup.absinfo.maximum = PyLong_AsLong(PyList_GetItem(item, 3));
abs_setup.absinfo.fuzz = PyLong_AsLong(PyList_GetItem(item, 4));
abs_setup.absinfo.flat = PyLong_AsLong(PyList_GetItem(item, 5));
abs_setup.absinfo.resolution = PyLong_AsLong(PyList_GetItem(item, 6));
if(ioctl(fd, UI_ABS_SETUP, &abs_setup) < 0)
goto on_err;
}
// Setup evdev:
struct uinput_setup usetup;
memset(&usetup, 0, sizeof(usetup));
strncpy(usetup.name, name, sizeof(usetup.name) - 1);
usetup.id.vendor = vendor;
usetup.id.product = product;
usetup.id.version = version;
usetup.id.bustype = bustype;
usetup.ff_effects_max = max_effects;
if(ioctl(fd, UI_DEV_SETUP, &usetup) < 0)
goto on_err;
Py_RETURN_NONE;
on_err:
_uinput_close(fd);
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
// Fallback setup function (Linux <= 4.5 and FreeBSD).
#else
static PyObject *
uinput_setup(PyObject *self, PyObject *args) {
int fd, len, i, abscode;
uint16_t vendor, product, version, bustype;
uint32_t max_effects;
PyObject *absinfo = NULL, *item = NULL;
struct uinput_user_dev uidev;
const char* name;
int ret = PyArg_ParseTuple(args, "isHHHHOI", &fd, &name, &vendor,
&product, &version, &bustype, &absinfo, &max_effects);
if (!ret) return NULL;
memset(&uidev, 0, sizeof(uidev));
strncpy(uidev.name, name, sizeof(uidev.name) - 1);
uidev.id.vendor = vendor;
uidev.id.product = product;
uidev.id.version = version;
uidev.id.bustype = bustype;
uidev.ff_effects_max = max_effects;
len = PyList_Size(absinfo);
for (i=0; i<len; i++) {
// item -> (ABS_X, 0, 255, 0, 0, 0, 0)
item = PyList_GetItem(absinfo, i);
abscode = (int)PyLong_AsLong(PyList_GetItem(item, 0));
/* min/max/fuzz/flat start from index 2 because index 1 is value */
uidev.absmin[abscode] = PyLong_AsLong(PyList_GetItem(item, 2));
uidev.absmax[abscode] = PyLong_AsLong(PyList_GetItem(item, 3));
uidev.absfuzz[abscode] = PyLong_AsLong(PyList_GetItem(item, 4));
uidev.absflat[abscode] = PyLong_AsLong(PyList_GetItem(item, 5));
}
if (write(fd, &uidev, sizeof(uidev)) != sizeof(uidev))
goto on_err;
Py_RETURN_NONE;
on_err:
_uinput_close(fd);
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
#endif
static PyObject *
uinput_create(PyObject *self, PyObject *args)
{
int fd;
int ret = PyArg_ParseTuple(args, "i", &fd);
if (!ret) return NULL;
if (ioctl(fd, UI_DEV_CREATE) < 0)
goto on_err;
Py_RETURN_NONE;
on_err:
_uinput_close(fd);
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
static PyObject *
uinput_close(PyObject *self, PyObject *args)
{
int fd;
int ret = PyArg_ParseTuple(args, "i", &fd);
if (!ret) return NULL;
if (_uinput_close(fd) < 0) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
Py_RETURN_NONE;
}
static PyObject *
uinput_write(PyObject *self, PyObject *args)
{
int fd, type, code, value;
int ret = PyArg_ParseTuple(args, "iiii", &fd, &type, &code, &value);
if (!ret) return NULL;
struct input_event event;
struct timeval tval;
memset(&event, 0, sizeof(event));
gettimeofday(&tval, 0);
event.input_event_usec = tval.tv_usec;
event.input_event_sec = tval.tv_sec;
event.type = type;
event.code = code;
event.value = value;
if (write(fd, &event, sizeof(event)) != sizeof(event)) {
// @todo: elaborate
// PyErr_SetString(PyExc_OSError, "error writing event to uinput device");
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
Py_RETURN_NONE;
}
static PyObject *
uinput_enable_event(PyObject *self, PyObject *args)
{
int fd;
uint16_t type, code;
unsigned long req;
int ret = PyArg_ParseTuple(args, "ihh", &fd, &type, &code);
if (!ret) return NULL;
switch (type) {
case EV_KEY: req = UI_SET_KEYBIT; break;
case EV_ABS: req = UI_SET_ABSBIT; break;
case EV_REL: req = UI_SET_RELBIT; break;
case EV_MSC: req = UI_SET_MSCBIT; break;
case EV_SW: req = UI_SET_SWBIT; break;
case EV_LED: req = UI_SET_LEDBIT; break;
case EV_FF: req = UI_SET_FFBIT; break;
case EV_SND: req = UI_SET_SNDBIT; break;
default:
errno = EINVAL;
goto on_err;
}
if (ioctl(fd, UI_SET_EVBIT, type) < 0)
goto on_err;
if (ioctl(fd, req, code) < 0)
goto on_err;
Py_RETURN_NONE;
on_err:
_uinput_close(fd);
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
int _uinput_begin_upload(int fd, struct uinput_ff_upload *upload)
{
return ioctl(fd, UI_BEGIN_FF_UPLOAD, upload);
}
int _uinput_end_upload(int fd, struct uinput_ff_upload *upload)
{
return ioctl(fd, UI_END_FF_UPLOAD, upload);
}
int _uinput_begin_erase(int fd, struct uinput_ff_erase *upload)
{
return ioctl(fd, UI_BEGIN_FF_ERASE, upload);
}
int _uinput_end_erase(int fd, struct uinput_ff_erase *upload)
{
return ioctl(fd, UI_END_FF_ERASE, upload);
}
static PyMethodDef MethodTable[] = {
{ "open", uinput_open, METH_VARARGS,
"Open uinput device node."},
{ "setup", uinput_setup, METH_VARARGS,
"Set an uinput device up."},
{ "create", uinput_create, METH_VARARGS,
"Create an uinput device."},
{ "close", uinput_close, METH_VARARGS,
"Destroy uinput device."},
{ "write", uinput_write, METH_VARARGS,
"Write event to uinput device."},
{ "enable", uinput_enable_event, METH_VARARGS,
"Enable a type of event."},
{ "set_phys", uinput_set_phys, METH_VARARGS,
"Set physical path"},
{ "get_sysname", uinput_get_sysname, METH_VARARGS,
"Obtain the sysname of the uinput device."},
{ "set_prop", uinput_set_prop, METH_VARARGS,
"Set device input property"},
{ NULL, NULL, 0, NULL}
};
static struct PyModuleDef moduledef = {
PyModuleDef_HEAD_INIT,
"_uinput",
"Python bindings for parts of linux/uinput.c",
-1, /* m_size */
MethodTable, /* m_methods */
NULL, /* m_reload */
NULL, /* m_traverse */
NULL, /* m_clear */
NULL, /* m_free */
};
static PyObject *
moduleinit(void)
{
PyObject* m = PyModule_Create(&moduledef);
if (m == NULL) return NULL;
PyModule_AddIntConstant(m, "maxnamelen", UINPUT_MAX_NAME_SIZE);
return m;
}
PyMODINIT_FUNC
PyInit__uinput(void)
{
return moduleinit();
}