RetroArch/input/drivers_hid/libusb_hid.c

305 lines
6.7 KiB
C

/* RetroArch - A frontend for libretro.
* Copyright (C) 2011-2015 - Daniel De Matteis
*
* RetroArch 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 Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include <libusb-1.0/libusb.h>
#include <rthreads/rthreads.h>
#include "../../driver.h"
#include "../input_hid_driver.h"
typedef struct libusb_hid
{
libusb_hotplug_callback_handle hp;
} libusb_hid_t;
struct libusb_adapter
{
volatile bool quitting;
struct libusb_device *device;
libusb_device_handle *handle;
sthread_t *thread;
struct libusb_adapter *next;
};
static struct libusb_adapter adapters;
static void adapter_thread(void *data)
{
struct libusb_adapter *adapter = (struct libusb_adapter*)data;
while (!adapter->quitting)
{
#if 0
static unsigned count;
fprintf(stderr, "Gets here, count: %d\n", count++);
#endif
}
}
static int add_adapter(struct libusb_device *dev)
{
int rc;
struct libusb_device_descriptor desc;
struct libusb_adapter *old_head = NULL;
struct libusb_adapter *adapter = (struct libusb_adapter*)calloc(1, sizeof(struct libusb_adapter));
if (!adapter)
{
fprintf(stderr, "Allocation of adapter failed.\n");
return -1;
}
rc = libusb_get_device_descriptor(dev, &desc);
if (rc != LIBUSB_SUCCESS)
{
fprintf(stderr, "Error getting device descriptor.\n");
goto error;
}
adapter->device = dev;
rc = libusb_open (adapter->device, &adapter->handle);
if (rc != LIBUSB_SUCCESS)
{
fprintf(stderr, "Error opening device 0x%p (VID/PID: %04x:%04x).\n",
adapter->device, desc.idVendor, desc.idProduct);
goto error;
}
if (libusb_kernel_driver_active(adapter->handle, 0) == 1
&& libusb_detach_kernel_driver(adapter->handle, 0))
{
fprintf(stderr, "Error detaching handle 0x%p from kernel.\n", adapter->handle);
goto error;
}
fprintf(stderr, "Device 0x%p attached (VID/PID: %04x:%04x).\n",
adapter->device, desc.idVendor, desc.idProduct);
adapter->thread = sthread_create(adapter_thread, adapter);
if (!adapter->thread)
{
fprintf(stderr, "Error initializing adapter thread.\n");
goto error;
}
old_head = adapters.next;
adapters.next = adapter;
adapter->next = old_head;
return 0;
error:
if (adapter->thread)
{
sthread_join(adapter->thread);
}
if (adapter)
free(adapter);
return -1;
}
static int remove_adapter(struct libusb_device *dev)
{
struct libusb_adapter *adapter = (struct libusb_adapter*)&adapters;
while (adapter->next != NULL)
{
if (adapter->next->device == dev)
{
fprintf(stderr, "Device 0x%p disconnected.\n", adapter->next->device);
struct libusb_adapter *new_next = NULL;
adapter->next->quitting = true;
sthread_join(adapter->next->thread);
libusb_close(adapter->next->handle);
new_next = adapter->next->next;
free(adapter->next);
adapter->next = new_next;
return 0;
}
adapter = adapter->next;
}
return -1;
}
static int libusb_hid_hotplug_callback(struct libusb_context *ctx,
struct libusb_device *dev, libusb_hotplug_event event, void *user_data)
{
switch (event)
{
case LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED:
add_adapter(dev);
break;
case LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT:
remove_adapter(dev);
break;
default:
fprintf(stderr, "Unhandled event: %d\n", event);
break;
}
return 0;
}
static bool libusb_hid_joypad_query(void *data, unsigned pad)
{
return pad < MAX_USERS;
}
static const char *libusb_hid_joypad_name(void *data, unsigned pad)
{
/* TODO/FIXME - implement properly */
if (pad >= MAX_USERS)
return NULL;
return NULL;
}
static uint64_t libusb_hid_joypad_get_buttons(void *data, unsigned port)
{
(void)data;
(void)port;
return 0;
}
static bool libusb_hid_joypad_button(void *data, unsigned port, uint16_t joykey)
{
(void)data;
(void)port;
(void)joykey;
return false;
}
static bool libusb_hid_joypad_rumble(void *data, unsigned pad,
enum retro_rumble_effect effect, uint16_t strength)
{
(void)data;
(void)pad;
(void)effect;
(void)strength;
return false;
}
static int16_t libusb_hid_joypad_axis(void *data, unsigned port, uint32_t joyaxis)
{
(void)data;
(void)port;
(void)joyaxis;
return 0;
}
static void libusb_hid_free(void *data)
{
libusb_hid_t *hid = (libusb_hid_t*)data;
while(adapters.next)
remove_adapter(adapters.next->device);
libusb_hotplug_deregister_callback(NULL, hid->hp);
libusb_exit(NULL);
if (hid)
free(hid);
}
static void *libusb_hid_init(void)
{
unsigned i;
int ret, count;
struct libusb_device **devices;
libusb_hid_t *hid = (libusb_hid_t*)calloc(1, sizeof(*hid));
if (!hid)
goto error;
ret = libusb_init(NULL);
if (ret < 0)
goto error;
if (!libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG))
goto error;
count = libusb_get_device_list(NULL, &devices);
for (i = 0; i < count; i++)
{
struct libusb_device_descriptor desc;
libusb_get_device_descriptor(devices[i], &desc);
if (desc.idVendor > 0 && desc.idProduct > 0)
add_adapter(devices[i]);
}
if (count > 0)
libusb_free_device_list(devices, 1);
ret = libusb_hotplug_register_callback(NULL,
LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED |
LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT, 0,
LIBUSB_HOTPLUG_MATCH_ANY,
LIBUSB_HOTPLUG_MATCH_ANY,
LIBUSB_HOTPLUG_MATCH_ANY,
libusb_hid_hotplug_callback,
NULL,
&hid->hp);
if (ret != LIBUSB_SUCCESS)
{
fprintf(stderr, "Error creating a hotplug callback.\n");
goto error;
}
return hid;
error:
libusb_hid_free(hid);
return hid;
}
static void libusb_hid_poll(void *data)
{
(void)data;
}
hid_driver_t libusb_hid = {
libusb_hid_init,
libusb_hid_joypad_query,
libusb_hid_free,
libusb_hid_joypad_button,
libusb_hid_joypad_get_buttons,
libusb_hid_joypad_axis,
libusb_hid_poll,
libusb_hid_joypad_rumble,
libusb_hid_joypad_name,
"libusb",
};