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input.c
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465 lines (360 loc) · 12.2 KB
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/*
* Python bindings to certain linux input subsystem functions.
*
* While everything here can be implemented in pure Python with struct and
* fcntl.ioctl, imho, it is much more straightforward to do so in C.
*
*/
#include <Python.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/input.h>
#include "util.h"
#define MAX_NAME_SIZE 256
extern char* EV_NAME[EV_CNT];
extern int EV_TYPE_MAX[EV_CNT];
extern char** EV_TYPE_NAME[EV_CNT];
extern char* BUS_NAME[];
int test_bit(const char* bitmask, int bit) {
return bitmask[bit/8] & (1 << (bit % 8));
}
// Read input event from a device and return a tuple that mimics input_event
static PyObject *
device_read(PyObject *self, PyObject *args)
{
int fd;
struct input_event event;
// get device file descriptor (O_RDONLY|O_NONBLOCK)
if (PyArg_ParseTuple(args, "i", &fd) < 0)
return NULL;
int n = read(fd, &event, sizeof(event));
if (n < 0) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
PyObject* sec = PyLong_FromLong(event.time.tv_sec);
PyObject* usec = PyLong_FromLong(event.time.tv_usec);
PyObject* val = PyLong_FromLong(event.value);
PyObject* py_input_event = NULL;
py_input_event = Py_BuildValue("OOhhO", sec, usec, event.type, event.code, val);
Py_DECREF(sec);
Py_DECREF(usec);
Py_DECREF(val);
return py_input_event;
}
// Read multiple input events from a device and return a list of tuples
static PyObject *
device_read_many(PyObject *self, PyObject *args)
{
int fd, i;
// get device file descriptor (O_RDONLY|O_NONBLOCK)
int ret = PyArg_ParseTuple(args, "i", &fd);
if (!ret) return NULL;
PyObject* event_list = PyList_New(0);
PyObject* py_input_event = NULL;
PyObject* sec = NULL;
PyObject* usec = NULL;
PyObject* val = NULL;
struct input_event event[64];
size_t event_size = sizeof(struct input_event);
ssize_t nread = read(fd, event, event_size*64);
if (nread < 0) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
// Construct a list of event tuples, which we'll make sense of in Python
for (i = 0 ; i < nread/event_size ; i++) {
sec = PyLong_FromLong(event[i].time.tv_sec);
usec = PyLong_FromLong(event[i].time.tv_usec);
val = PyLong_FromLong(event[i].value);
py_input_event = Py_BuildValue("OOhhO", sec, usec, event[i].type, event[i].code, val);
PyList_Append(event_list, py_input_event);
Py_DECREF(py_input_event);
Py_DECREF(sec);
Py_DECREF(usec);
Py_DECREF(val);
}
return event_list;
}
// Unpack a single event (this is essentially a struct.unpack(), without having
// to worry about word size.
static PyObject *
event_unpack(PyObject *self, PyObject *args)
{
struct input_event event;
const char *data;
int len;
int ret = PyArg_ParseTuple(args, "s#", &data, &len);
if (!ret) return NULL;
memcpy(&event, data, sizeof(event));
Py_RETURN_NONE;
}
// Get the event types and event codes that the input device supports
static PyObject *
ioctl_capabilities(PyObject *self, PyObject *args)
{
int fd, ev_type, ev_code;
char ev_bits[EV_MAX/8], code_bits[KEY_MAX/8];
struct input_absinfo absinfo;
int ret = PyArg_ParseTuple(args, "i", &fd);
if (!ret) return NULL;
// @todo: figure out why fd gets zeroed on an ioctl after the
// refactoring and get rid of this workaround
const int _fd = fd;
// Capabilities is a mapping of supported event types to lists of handled
// events e.g: {1: [272, 273, 274, 275], 2: [0, 1, 6, 8]}
PyObject* capabilities = PyDict_New();
PyObject* eventcodes = NULL;
PyObject* evlong = NULL;
PyObject* capability = NULL;
PyObject* py_absinfo = NULL;
PyObject* absitem = NULL;
memset(&ev_bits, 0, sizeof(ev_bits));
if (ioctl(_fd, EVIOCGBIT(0, EV_MAX), ev_bits) < 0)
goto on_err;
// Build a dictionary of the device's capabilities
for (ev_type=0 ; ev_type<EV_MAX ; ev_type++) {
if (test_bit(ev_bits, ev_type)) {
capability = PyLong_FromLong(ev_type);
eventcodes = PyList_New(0);
memset(&code_bits, 0, sizeof(code_bits));
ioctl(_fd, EVIOCGBIT(ev_type, KEY_MAX), code_bits);
for (ev_code = 0; ev_code < KEY_MAX; ev_code++) {
if (test_bit(code_bits, ev_code)) {
// Get abs{min,max,fuzz,flat} values for ABS_* event codes
if (ev_type == EV_ABS) {
memset(&absinfo, 0, sizeof(absinfo));
ioctl(_fd, EVIOCGABS(ev_code), &absinfo);
py_absinfo = Py_BuildValue("(iiiiii)",
absinfo.value,
absinfo.minimum,
absinfo.maximum,
absinfo.fuzz,
absinfo.flat,
absinfo.resolution);
evlong = PyLong_FromLong(ev_code);
absitem = Py_BuildValue("(OO)", evlong, py_absinfo);
// absitem -> tuple(ABS_X, (0, 255, 0, 0))
PyList_Append(eventcodes, absitem);
Py_DECREF(absitem);
Py_DECREF(py_absinfo);
}
else {
evlong = PyLong_FromLong(ev_code);
PyList_Append(eventcodes, evlong);
}
Py_DECREF(evlong);
}
}
// capabilities[EV_KEY] = [KEY_A, KEY_B, KEY_C, ...]
// capabilities[EV_ABS] = [(ABS_X, (0, 255, 0, 0)), ...]
PyDict_SetItem(capabilities, capability, eventcodes);
Py_DECREF(capability);
Py_DECREF(eventcodes);
}
}
return capabilities;
on_err:
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
// An all-in-one function for describing an input device
static PyObject *
ioctl_devinfo(PyObject *self, PyObject *args)
{
int fd;
struct input_id iid;
char name[MAX_NAME_SIZE];
char phys[MAX_NAME_SIZE] = {0};
int ret = PyArg_ParseTuple(args, "i", &fd);
if (!ret) return NULL;
memset(&iid, 0, sizeof(iid));
if (ioctl(fd, EVIOCGID, &iid) < 0) goto on_err;
if (ioctl(fd, EVIOCGNAME(sizeof(name)), name) < 0) goto on_err;
// Some devices do not have a physical topology associated with them
ioctl(fd, EVIOCGPHYS(sizeof(phys)), phys);
return Py_BuildValue("hhhhss", iid.bustype, iid.vendor, iid.product, iid.version,
name, phys);
on_err:
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
static PyObject *
ioctl_EVIOCGREP(PyObject *self, PyObject *args)
{
int fd, ret;
unsigned int rep[2] = {0};
ret = PyArg_ParseTuple(args, "i", &fd);
if (!ret) return NULL;
ioctl(fd, EVIOCGREP, &rep);
return Py_BuildValue("(ii)", rep[0], rep[1]);
}
static PyObject *
ioctl_EVIOCSREP(PyObject *self, PyObject *args)
{
int fd, ret;
unsigned int rep[2] = {0};
ret = PyArg_ParseTuple(args, "iii", &fd, &rep[0], &rep[1]);
if (!ret) return NULL;
ret = ioctl(fd, EVIOCSREP, &rep);
return Py_BuildValue("i", ret);
}
static PyObject *
ioctl_EVIOCGVERSION(PyObject *self, PyObject *args)
{
int fd, ret, res;
ret = PyArg_ParseTuple(args, "i", &fd);
if (!ret) return NULL;
ret = ioctl(fd, EVIOCGVERSION, &res);
return Py_BuildValue("i", res);
}
static PyObject *
ioctl_EVIOCGRAB(PyObject *self, PyObject *args)
{
int fd, ret, flag;
ret = PyArg_ParseTuple(args, "ii", &fd, &flag);
if (!ret) return NULL;
ret = ioctl(fd, EVIOCGRAB, (intptr_t)flag);
if (ret != 0) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
Py_INCREF(Py_None);
return Py_None;
}
// todo: this function needs a better name
static PyObject *
get_sw_led_snd(PyObject *self, PyObject *args)
{
int i, max, fd, evtype, ret;
PyObject* res = PyList_New(0);
ret = PyArg_ParseTuple(args, "ii", &fd, &evtype);
if (!ret) return NULL;
if (evtype == EV_LED)
max = LED_MAX;
else if (evtype == EV_SW)
max = SW_MAX;
else if (evtype == EV_SND)
max = SND_MAX;
else
return NULL;
char bytes[(max+7)/8];
memset(bytes, 0, sizeof bytes);
if (evtype == EV_LED)
ret = ioctl(fd, EVIOCGLED(sizeof(bytes)), &bytes);
else if (evtype == EV_SW)
ret = ioctl(fd, EVIOCGSW(sizeof(bytes)), &bytes);
else if (evtype == EV_SND)
ret = ioctl(fd, EVIOCGSND(sizeof(bytes)), &bytes);
for (i=0 ; i<max ; i++) {
if (test_bit(bytes, i)) {
PyList_Append(res, Py_BuildValue("i", i));
}
}
return res;
}
static PyObject *
ioctl_EVIOCGEFFECTS(PyObject *self, PyObject *args)
{
int fd, ret, res;
ret = PyArg_ParseTuple(args, "i", &fd);
if (!ret) return NULL;
ret = ioctl(fd, EVIOCGEFFECTS, &res);
return Py_BuildValue("i", res);
}
static PyObject *
upload_effect(PyObject *self, PyObject *args)
{
int fd, ret;
PyObject* effect_data;
ret = PyArg_ParseTuple(args, "iO", &fd, &effect_data);
if (!ret) return NULL;
void* data = PyBytes_AsString(effect_data);
struct ff_effect effect = {};
memmove(&effect, data, sizeof(struct ff_effect));
// print_ff_effect(&effect);
ret = ioctl(fd, EVIOCSFF, &effect);
if (ret != 0) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
return Py_BuildValue("i", effect.id);
}
static PyObject *
erase_effect(PyObject *self, PyObject *args)
{
int fd, ret;
PyObject* ff_id_obj;
ret = PyArg_ParseTuple(args, "iO", &fd, &ff_id_obj);
if (!ret) return NULL;
long ff_id = PyLong_AsLong(ff_id_obj);
ret = ioctl(fd, EVIOCRMFF, ff_id);
if (ret != 0) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
Py_INCREF(Py_None);
return Py_None;
}
static PyMethodDef MethodTable[] = {
{ "unpack", event_unpack, METH_VARARGS, "unpack a single input event" },
{ "ioctl_devinfo", ioctl_devinfo, METH_VARARGS, "fetch input device info" },
{ "ioctl_capabilities", ioctl_capabilities, METH_VARARGS, "fetch input device capabilities" },
{ "ioctl_EVIOCGREP", ioctl_EVIOCGREP, METH_VARARGS},
{ "ioctl_EVIOCSREP", ioctl_EVIOCSREP, METH_VARARGS},
{ "ioctl_EVIOCGVERSION", ioctl_EVIOCGVERSION, METH_VARARGS},
{ "ioctl_EVIOCGRAB", ioctl_EVIOCGRAB, METH_VARARGS},
{ "ioctl_EVIOCGEFFECTS", ioctl_EVIOCGEFFECTS, METH_VARARGS, "fetch the number of effects the device can keep in its memory." },
{ "get_sw_led_snd", get_sw_led_snd, METH_VARARGS},
{ "device_read", device_read, METH_VARARGS, "read an input event from a device" },
{ "device_read_many", device_read_many, METH_VARARGS, "read all available input events from a device" },
{ "upload_effect", upload_effect, METH_VARARGS, "" },
{ "erase_effect", erase_effect, METH_VARARGS, "" },
{ NULL, NULL, 0, NULL}
};
#define MODULE_NAME "_input"
#define MODULE_HELP "Python bindings to certain linux input subsystem functions"
#if PY_MAJOR_VERSION >= 3
static struct PyModuleDef moduledef = {
PyModuleDef_HEAD_INIT,
MODULE_NAME,
MODULE_HELP,
-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;
return m;
}
PyMODINIT_FUNC
PyInit__input(void)
{
return moduleinit();
}
#else
static PyObject *
moduleinit(void)
{
PyObject* m = Py_InitModule3(MODULE_NAME, MethodTable, MODULE_HELP);
if (m == NULL) return NULL;
return m;
}
PyMODINIT_FUNC
init_input(void)
{
moduleinit();
}
#endif