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/*
* XWiimote - lib
* Written 2010-2013 by David Herrmann <dh.herrmann@gmail.com>
* Dedicated to the Public Domain
*/
/*
* Device Enumeration and Monitorig
* Use libudev to enumerate all currently connected devices and allow
* monitoring the system for new devices.
* Normal applications should integrate this into their own udev-monitor.
* However, smaller applications might not use udev on their own so this API
* wraps the udev API in a small easy xwiimote API.
*/
#include <fcntl.h>
#include <libudev.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "xwiimote.h"
struct xwii_monitor {
size_t ref;
struct udev *udev;
struct udev_enumerate *enumerate;
struct udev_list_entry *entry;
struct udev_monitor *monitor;
};
XWII__EXPORT
struct xwii_monitor *xwii_monitor_new(bool poll, bool direct)
{
struct udev *udev;
struct udev_enumerate *enumerate = NULL;
struct udev_list_entry *entry;
struct udev_monitor *monitor = NULL;
struct xwii_monitor *mon;
udev = udev_new();
if (!udev)
return NULL;
enumerate = udev_enumerate_new(udev);
if (!enumerate)
goto out;
if (0 != udev_enumerate_add_match_subsystem(enumerate, "hid"))
goto out;
if (0 != udev_enumerate_scan_devices(enumerate))
goto out;
entry = udev_enumerate_get_list_entry(enumerate);
if (poll) {
monitor = udev_monitor_new_from_netlink(udev,
direct ? "kernel" : "udev");
if (!monitor)
goto out;
if (udev_monitor_filter_add_match_subsystem_devtype(monitor,
"hid", NULL))
goto out;
if (udev_monitor_enable_receiving(monitor))
goto out;
}
mon = malloc(sizeof(*mon));
if (!mon)
goto out;
mon->ref = 1;
mon->udev = udev;
mon->enumerate = enumerate;
mon->entry = entry;
mon->monitor = monitor;
return mon;
out:
if (monitor)
udev_monitor_unref(monitor);
if (enumerate)
udev_enumerate_unref(enumerate);
udev_unref(udev);
return NULL;
}
XWII__EXPORT
void xwii_monitor_ref(struct xwii_monitor *mon)
{
if (!mon || !mon->ref)
return;
mon->ref++;
}
static inline void free_enum(struct xwii_monitor *monitor)
{
if (monitor->enumerate) {
udev_enumerate_unref(monitor->enumerate);
monitor->enumerate = NULL;
monitor->entry = NULL;
}
}
XWII__EXPORT
void xwii_monitor_unref(struct xwii_monitor *monitor)
{
if (!monitor || !monitor->ref)
return;
if (--monitor->ref)
return;
free_enum(monitor);
if (monitor->monitor)
udev_monitor_unref(monitor->monitor);
udev_unref(monitor->udev);
free(monitor);
}
XWII__EXPORT
int xwii_monitor_get_fd(struct xwii_monitor *monitor, bool blocking)
{
signed int fd, set;
if (!monitor || !monitor->monitor)
return -1;
fd = udev_monitor_get_fd(monitor->monitor);
if (fd < 0)
return -1;
set = fcntl(fd, F_GETFL);
if (set < 0)
return -1;
if (blocking)
set &= ~O_NONBLOCK;
else
set |= O_NONBLOCK;
if (0 != fcntl(fd, F_SETFL, set))
return -1;
return fd;
}
static struct udev_device *next_enum(struct xwii_monitor *monitor)
{
struct udev_list_entry *e;
struct udev_device *dev;
const char *path;
while (monitor->entry) {
e = monitor->entry;
monitor->entry = udev_list_entry_get_next(e);
path = udev_list_entry_get_name(e);
dev = udev_device_new_from_syspath(monitor->udev, path);
if (dev)
return dev;
}
free_enum(monitor);
return NULL;
}
static char *make_device(struct udev_device *dev)
{
const char *tmp, *driver, *subs;
char *ret = NULL;
tmp = udev_device_get_action(dev);
if (tmp && strcmp(tmp, "add"))
goto out;
driver = udev_device_get_driver(dev);
subs = udev_device_get_subsystem(dev);
if (!driver || strcmp(driver, "wiimote") ||
!subs || strcmp(subs, "hid"))
goto out;
tmp = udev_device_get_syspath(dev);
if (tmp)
ret = strdup(tmp);
out:
udev_device_unref(dev);
return ret;
}
XWII__EXPORT
char *xwii_monitor_poll(struct xwii_monitor *monitor)
{
struct udev_device *dev;
char *ret;
if (!monitor)
return NULL;
if (monitor->enumerate) {
while (1) {
dev = next_enum(monitor);
if (!dev)
/* notify application of end of enum */
return NULL;
ret = make_device(dev);
if (ret)
return ret;
}
} else if (monitor->monitor) {
while (1) {
dev = udev_monitor_receive_device(monitor->monitor);
if (!dev)
return NULL;
ret = make_device(dev);
if (ret)
return ret;
}
}
return NULL;
}
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