/*-
* Copyright (c) 2016-2019 Hans Petter Selasky. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdef LIBUSB_GLOBAL_INCLUDE_FILE
#include LIBUSB_GLOBAL_INCLUDE_FILE
#else
#include <assert.h>
#include <errno.h>
#include <poll.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/endian.h>
#endif
#define libusb_device_handle libusb20_device
#include "libusb20.h"
#include "libusb20_desc.h"
#include "libusb20_int.h"
#include "libusb.h"
#include "libusb10.h"
static int
libusb_hotplug_equal(libusb_device *_adev, libusb_device *_bdev)
{
struct libusb20_device *adev = _adev->os_priv;
struct libusb20_device *bdev = _bdev->os_priv;
if (adev->bus_number != bdev->bus_number)
return (0);
if (adev->device_address != bdev->device_address)
return (0);
if (memcmp(&adev->ddesc, &bdev->ddesc, sizeof(adev->ddesc)))
return (0);
if (memcmp(&adev->session_data, &bdev->session_data, sizeof(adev->session_data)))
return (0);
return (1);
}
static int
libusb_hotplug_filter(libusb_context *ctx, libusb_hotplug_callback_handle pcbh,
libusb_device *dev, libusb_hotplug_event event)
{
if (!(pcbh->events & event))
return (0);
if (pcbh->vendor != LIBUSB_HOTPLUG_MATCH_ANY &&
pcbh->vendor != libusb20_dev_get_device_desc(dev->os_priv)->idVendor)
return (0);
if (pcbh->product != LIBUSB_HOTPLUG_MATCH_ANY &&
pcbh->product != libusb20_dev_get_device_desc(dev->os_priv)->idProduct)
return (0);
if (pcbh->devclass != LIBUSB_HOTPLUG_MATCH_ANY &&
pcbh->devclass != libusb20_dev_get_device_desc(dev->os_priv)->bDeviceClass)
return (0);
return (pcbh->fn(ctx, dev, event, pcbh->user_data));
}
static int
libusb_hotplug_enumerate(libusb_context *ctx, struct libusb_device_head *phead)
{
libusb_device **ppdev;
ssize_t count;
ssize_t x;
count = libusb_get_device_list(ctx, &ppdev);
if (count < 0)
return (-1);
for (x = 0; x != count; x++)
TAILQ_INSERT_TAIL(phead, ppdev[x], hotplug_entry);
libusb_free_device_list(ppdev, 0);
return (0);
}
static void *
libusb_hotplug_scan(void *arg)
{
struct libusb_device_head hotplug_devs;
libusb_hotplug_callback_handle acbh;
libusb_hotplug_callback_handle bcbh;
libusb_context *ctx = arg;
libusb_device *temp;
libusb_device *adev;
libusb_device *bdev;
unsigned do_loop = 1;
while (do_loop) {
usleep(4000000);
HOTPLUG_LOCK(ctx);
TAILQ_INIT(&hotplug_devs);
if (ctx->hotplug_handler != NO_THREAD) {
if (libusb_hotplug_enumerate(ctx, &hotplug_devs) < 0) {
HOTPLUG_UNLOCK(ctx);
continue;
}
} else {
do_loop = 0;
}
/* figure out which devices are gone */
TAILQ_FOREACH_SAFE(adev, &ctx->hotplug_devs, hotplug_entry, temp) {
TAILQ_FOREACH(bdev, &hotplug_devs, hotplug_entry) {
if (libusb_hotplug_equal(adev, bdev))
break;
}
if (bdev == NULL) {
TAILQ_REMOVE(&ctx->hotplug_devs, adev, hotplug_entry);
TAILQ_FOREACH_SAFE(acbh, &ctx->hotplug_cbh, entry, bcbh) {
if (libusb_hotplug_filter(ctx, acbh, adev,
LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT) == 0)
continue;
TAILQ_REMOVE(&ctx->hotplug_cbh, acbh, entry);
free(acbh);
}
libusb_unref_device(adev);
}
}
/* figure out which devices are new */
TAILQ_FOREACH_SAFE(adev, &hotplug_devs, hotplug_entry, temp) {
TAILQ_FOREACH(bdev, &ctx->hotplug_devs, hotplug_entry) {
if (libusb_hotplug_equal(adev, bdev))
break;
}
if (bdev == NULL) {
TAILQ_REMOVE(&hotplug_devs, adev, hotplug_entry);
TAILQ_INSERT_TAIL(&ctx->hotplug_devs, adev, hotplug_entry);
TAILQ_FOREACH_SAFE(acbh, &ctx->hotplug_cbh, entry, bcbh) {
if (libusb_hotplug_filter(ctx, acbh, adev,
LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED) == 0)
continue;
TAILQ_REMOVE(&ctx->hotplug_cbh, acbh, entry);
free(acbh);
}
}
}
HOTPLUG_UNLOCK(ctx);
/* unref remaining devices */
while ((adev = TAILQ_FIRST(&hotplug_devs)) != NULL) {
TAILQ_REMOVE(&hotplug_devs, adev, hotplug_entry);
libusb_unref_device(adev);
}
}
return (NULL);
}
int libusb_hotplug_register_callback(libusb_context *ctx,
libusb_hotplug_event events, libusb_hotplug_flag flags,
int vendor_id, int product_id, int dev_class,
libusb_hotplug_callback_fn cb_fn, void *user_data,
libusb_hotplug_callback_handle *phandle)
{
libusb_hotplug_callback_handle handle;
struct libusb_device *adev;
ctx = GET_CONTEXT(ctx);
if (ctx == NULL || cb_fn == NULL || events == 0 ||
vendor_id < -1 || vendor_id > 0xffff ||
product_id < -1 || product_id > 0xffff ||
dev_class < -1 || dev_class > 0xff)
return (LIBUSB_ERROR_INVALID_PARAM);
handle = malloc(sizeof(*handle));
if (handle == NULL)
return (LIBUSB_ERROR_NO_MEM);
HOTPLUG_LOCK(ctx);
if (ctx->hotplug_handler == NO_THREAD) {
libusb_hotplug_enumerate(ctx, &ctx->hotplug_devs);
if (pthread_create(&ctx->hotplug_handler, NULL,
&libusb_hotplug_scan, ctx) != 0)
ctx->hotplug_handler = NO_THREAD;
}
handle->events = events;
handle->vendor = vendor_id;
handle->product = product_id;
handle->devclass = dev_class;
handle->fn = cb_fn;
handle->user_data = user_data;
if (flags & LIBUSB_HOTPLUG_ENUMERATE) {
TAILQ_FOREACH(adev, &ctx->hotplug_devs, hotplug_entry) {
if (libusb_hotplug_filter(ctx, handle, adev,
LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED) == 0)
continue;
free(handle);
handle = NULL;
break;
}
}
if (handle != NULL)
TAILQ_INSERT_TAIL(&ctx->hotplug_cbh, handle, entry);
HOTPLUG_UNLOCK(ctx);
if (phandle != NULL)
*phandle = handle;
return (LIBUSB_SUCCESS);
}
void libusb_hotplug_deregister_callback(libusb_context *ctx,
libusb_hotplug_callback_handle handle)
{
ctx = GET_CONTEXT(ctx);
if (ctx == NULL || handle == NULL)
return;
HOTPLUG_LOCK(ctx);
TAILQ_REMOVE(&ctx->hotplug_cbh, handle, entry);
HOTPLUG_UNLOCK(ctx);
free(handle);
}
