diff options
Diffstat (limited to 'libusb/core.c')
| -rw-r--r-- | libusb/core.c | 86 |
1 files changed, 71 insertions, 15 deletions
diff --git a/libusb/core.c b/libusb/core.c index 634bc8b..0f6b22d 100644 --- a/libusb/core.c +++ b/libusb/core.c @@ -435,8 +435,14 @@ API_EXPORTED libusb_device_handle *libusb_open(libusb_device *dev) if (!handle) return NULL; + r = pthread_mutex_init(&handle->lock, NULL); + if (r) + return NULL; + handle->dev = libusb_device_ref(dev); + handle->claimed_interfaces = 0; memset(&handle->os_priv, 0, priv_size); + r = usbi_backend->open(handle); if (r < 0) { libusb_device_unref(dev); @@ -534,40 +540,90 @@ API_EXPORTED libusb_device *libusb_get_device(libusb_device_handle *dev_handle) return dev_handle->dev; } -/* FIXME: what about claiming multiple interfaces? */ /** \ingroup dev * Claim an interface on a given device handle. You must claim the interface - * you wish to use before you can perform I/O on any of the endpoints. - * \param iface the <tt>bInterfaceNumber</tt> of the interface you wish to claim + * you wish to use before you can perform I/O on any of its endpoints. + * + * It is legal to attempt to claim an already-claimed interface, in which + * case libusb just returns 0 without doing anything. + * * \param dev a device handle + * \param interface_number the <tt>bInterfaceNumber</tt> of the interface you + * wish to claim * \returns 0 on success, or a LIBUSB_ERROR code on failure */ -API_EXPORTED int libusb_claim_interface(libusb_device_handle *dev, int iface) +API_EXPORTED int libusb_claim_interface(libusb_device_handle *dev, + int interface_number) { - usbi_dbg("interface %d", iface); - return usbi_backend->claim_interface(dev, iface); + int r = 0; + + usbi_dbg("interface %d", interface_number); + if (interface_number >= sizeof(dev->claimed_interfaces) * 8) + return LIBUSB_ERROR_INVALID_PARAM; + + pthread_mutex_lock(&dev->lock); + if (dev->claimed_interfaces & (1 << interface_number)) + goto out; + + r = usbi_backend->claim_interface(dev, interface_number); + if (r == 0) + dev->claimed_interfaces |= 1 << interface_number; + +out: + pthread_mutex_unlock(&dev->lock); + return r; } /** \ingroup dev * Release an interface previously claimed with libusb_claim_interface(). You * should release all claimed interfaces before closing a device handle. * \param dev a device handle - * \param iface the <tt>bInterfaceNumber</tt> of the previously-claimed - * interface - * \returns 0 on success, or a LIBUSB_ERROR code on failure + * \param interface_number the <tt>bInterfaceNumber</tt> of the + * previously-claimed interface + * \returns 0 on success, or a LIBUSB_ERROR code on failure. + * LIBUSB_ERROR_NOT_FOUND indicates that the interface was not claimed. */ -API_EXPORTED int libusb_release_interface(libusb_device_handle *dev, int iface) +API_EXPORTED int libusb_release_interface(libusb_device_handle *dev, + int interface_number) { - usbi_dbg("interface %d", iface); - return usbi_backend->release_interface(dev, iface); + int r; + + usbi_dbg("interface %d", interface_number); + if (interface_number >= sizeof(dev->claimed_interfaces) * 8) + return LIBUSB_ERROR_INVALID_PARAM; + + pthread_mutex_lock(&dev->lock); + if (!(dev->claimed_interfaces & (1 << interface_number))) { + r = LIBUSB_ERROR_NOT_FOUND; + goto out; + } + + r = usbi_backend->release_interface(dev, interface_number); + if (r == 0) + dev->claimed_interfaces &= ~(1 << interface_number); + +out: + pthread_mutex_unlock(&dev->lock); + return r; } /* FIXME docs */ API_EXPORTED int libusb_set_interface_altsetting(libusb_device_handle *dev, - int iface, int altsetting) + int interface_number, int altsetting) { - usbi_dbg("interface %d altsetting %d", iface, altsetting); - return usbi_backend->set_interface_altsetting(dev, iface, altsetting); + usbi_dbg("interface %d altsetting %d", interface_number, altsetting); + if (interface_number >= sizeof(dev->claimed_interfaces) * 8) + return LIBUSB_ERROR_INVALID_PARAM; + + pthread_mutex_lock(&dev->lock); + if (!(dev->claimed_interfaces & (1 << interface_number))) { + pthread_mutex_unlock(&dev->lock); + return LIBUSB_ERROR_NOT_FOUND; + } + pthread_mutex_unlock(&dev->lock); + + return usbi_backend->set_interface_altsetting(dev, interface_number, + altsetting); } /** \ingroup lib |