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authorGravatar Hector Martin2010-05-25 04:11:13 +0200
committerGravatar Hector Martin2010-05-25 04:11:13 +0200
commit61751f1934af3eefbf3d6134a2f400af6b8f336c (patch)
tree8a44ea98e59af8d3ca1e778adbdc61ece7914738 /daemon
parentaacdff7345e265b593780115912511cd3724f22f (diff)
downloadusbmuxd-61751f1934af3eefbf3d6134a2f400af6b8f336c.tar.gz
usbmuxd-61751f1934af3eefbf3d6134a2f400af6b8f336c.tar.bz2
Detach kernel drivers before changing configurations
This is especially useful when bConfigurationValue is 2, which tends to be a mixed HID/USB-Audio configuration that the kernel likes to use. Otherwise usbmuxd cannot change the configuration.
Diffstat (limited to 'daemon')
-rw-r--r--daemon/usb-linux.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/daemon/usb-linux.c b/daemon/usb-linux.c
index cc1bbaf..c9420c8 100644
--- a/daemon/usb-linux.c
+++ b/daemon/usb-linux.c
@@ -286,6 +286,26 @@ int usb_discover(void)
continue;
}
if (current_config != devdesc.bNumConfigurations) {
+ struct libusb_config_descriptor *config;
+ if((res = libusb_get_active_config_descriptor(dev, &config)) != 0) {
+ usbmuxd_log(LL_NOTICE, "Could not get old configuration descriptor for device %d-%d: %d", bus, address, res);
+ } else {
+ for(j=0; j<config->bNumInterfaces; j++) {
+ const struct libusb_interface_descriptor *intf = &config->interface[j].altsetting[0];
+ if((res = libusb_kernel_driver_active(handle, intf->bInterfaceNumber)) < 0) {
+ usbmuxd_log(LL_NOTICE, "Could not check kernel ownership of interface %d for device %d-%d: %d", intf->bInterfaceNumber, bus, address, res);
+ continue;
+ }
+ if(res == 1) {
+ usbmuxd_log(LL_INFO, "Detaching kernel driver for device %d-%d, interface %d", bus, address, intf->bInterfaceNumber);
+ if((res = libusb_detach_kernel_driver(handle, intf->bInterfaceNumber)) < 0) {
+ usbmuxd_log(LL_WARNING, "Could not detach kernel driver (%d), configuration change will probably fail!", res);
+ continue;
+ }
+ }
+ }
+ libusb_free_config_descriptor(config);
+ }
if((res = libusb_set_configuration(handle, devdesc.bNumConfigurations)) != 0) {
usbmuxd_log(LL_WARNING, "Could not set configuration %d for device %d-%d: %d", devdesc.bNumConfigurations, bus, address, res);
libusb_close(handle);