void usbi_hotplug_match(struct libusb_device *dev, libusb_hotplug_event event)
{
struct libusb_hotplug_callback *hotplug_cb, *next;
struct libusb_context *ctx = dev->ctx;
int ret;
usbi_mutex_lock(&ctx->hotplug_cbs_lock);
list_for_each_entry_safe(hotplug_cb, next, &ctx->hotplug_cbs, list, struct libusb_hotplug_callback) {
usbi_mutex_unlock(&ctx->hotplug_cbs_lock);
ret = usbi_hotplug_match_cb (dev, event, hotplug_cb);
usbi_mutex_lock(&ctx->hotplug_cbs_lock);
if (ret) {
list_del(&hotplug_cb->list);
free(hotplug_cb);
}
}
usbi_mutex_unlock(&ctx->hotplug_cbs_lock);
/* loop through and disconnect all open handles for this device */
if (LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT == event) {
struct libusb_device_handle *handle;
usbi_mutex_lock(&ctx->open_devs_lock);
list_for_each_entry(handle, &ctx->open_devs, list, struct libusb_device_handle) {
if (dev == handle->dev) {
usbi_handle_disconnect (handle);
}
}
usbi_mutex_unlock(&ctx->open_devs_lock);
}
}
void usbi_hotplug_match(struct libusb_context *ctx, struct libusb_device *dev,
libusb_hotplug_event event)
{
struct libusb_hotplug_callback *hotplug_cb, *next;
int ret;
usbi_mutex_lock(&ctx->hotplug_cbs_lock);
list_for_each_entry_safe(hotplug_cb, next, &ctx->hotplug_cbs, list, struct libusb_hotplug_callback) {
usbi_mutex_unlock(&ctx->hotplug_cbs_lock);
ret = usbi_hotplug_match_cb (ctx, dev, event, hotplug_cb);
usbi_mutex_lock(&ctx->hotplug_cbs_lock);
if (ret) {
list_del(&hotplug_cb->list);
free(hotplug_cb);
}
}
usbi_mutex_unlock(&ctx->hotplug_cbs_lock);
/* the backend is expected to call the callback for each active transfer */
}
int API_EXPORTED 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 *handle)
{
libusb_hotplug_callback *new_callback;
static int handle_id = 1;
/* check for hotplug support */
if (!libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) {
return LIBUSB_ERROR_NOT_SUPPORTED;
}
/* check for sane values */
if ((LIBUSB_HOTPLUG_MATCH_ANY != vendor_id && (~0xffff & vendor_id)) ||
(LIBUSB_HOTPLUG_MATCH_ANY != product_id && (~0xffff & product_id)) ||
(LIBUSB_HOTPLUG_MATCH_ANY != dev_class && (~0xff & dev_class)) ||
!cb_fn) {
return LIBUSB_ERROR_INVALID_PARAM;
}
USBI_GET_CONTEXT(ctx);
new_callback = (libusb_hotplug_callback *)calloc(1, sizeof (*new_callback));
if (!new_callback) {
return LIBUSB_ERROR_NO_MEM;
}
new_callback->ctx = ctx;
new_callback->vendor_id = vendor_id;
new_callback->product_id = product_id;
new_callback->dev_class = dev_class;
new_callback->flags = flags;
new_callback->events = events;
new_callback->cb = cb_fn;
new_callback->user_data = user_data;
new_callback->needs_free = 0;
usbi_mutex_lock(&ctx->hotplug_cbs_lock);
/* protect the handle by the context hotplug lock. it doesn't matter if the same handle
* is used for different contexts only that the handle is unique for this context */
new_callback->handle = handle_id++;
list_add(&new_callback->list, &ctx->hotplug_cbs);
usbi_mutex_unlock(&ctx->hotplug_cbs_lock);
if (flags & LIBUSB_HOTPLUG_ENUMERATE) {
int i, len;
struct libusb_device **devs;
len = (int) libusb_get_device_list(ctx, &devs);
if (len < 0) {
libusb_hotplug_deregister_callback(ctx,
new_callback->handle);
return len;
}
for (i = 0; i < len; i++) {
usbi_hotplug_match_cb(ctx, devs[i],
LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED,
new_callback);
}
libusb_free_device_list(devs, 1);
}
if (handle) {
*handle = new_callback->handle;
}
return LIBUSB_SUCCESS;
}
