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-rw-r--r--src/usb.c117
-rw-r--r--src/usb.h4
2 files changed, 113 insertions, 8 deletions
diff --git a/src/usb.c b/src/usb.c
index 4ff2d07..ca941bc 100644
--- a/src/usb.c
+++ b/src/usb.c
@@ -65,6 +65,15 @@ struct usb_device {
struct libusb_device_descriptor devdesc;
};
+struct mode_user_data {
+ uint8_t bus, address;
+ uint8_t bRequest;
+ uint16_t wValue;
+ uint16_t wIndex;
+ uint16_t wLength;
+ unsigned int timeout;
+};
+
static struct collection device_list;
static struct timeval next_dev_poll_time;
@@ -357,6 +366,77 @@ static void get_langid_callback(struct libusb_transfer *transfer)
}
}
+static int submit_vendor_specific(struct libusb_device_handle *handle, struct mode_user_data *user_data, libusb_transfer_cb_fn callback) {
+ struct libusb_transfer* ctrl_transfer = libusb_alloc_transfer(0);
+ unsigned char* buffer = malloc(LIBUSB_CONTROL_SETUP_SIZE);
+ uint8_t bRequestType = LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_IN | LIBUSB_RECIPIENT_DEVICE;
+ libusb_fill_control_setup(buffer, bRequestType, user_data->bRequest, user_data->wValue, user_data->wIndex, user_data->wLength);
+
+ ctrl_transfer->flags = LIBUSB_TRANSFER_FREE_BUFFER | LIBUSB_TRANSFER_FREE_TRANSFER;
+ libusb_fill_control_transfer(ctrl_transfer, handle, buffer, callback, user_data, user_data->timeout);
+
+ return libusb_submit_transfer(ctrl_transfer);
+}
+
+static void switch_mode_cb(struct libusb_transfer* transfer) {
+ struct mode_user_data* user_data = transfer->user_data;
+
+ if(transfer->status != LIBUSB_TRANSFER_COMPLETED) {
+ usbmuxd_log(LL_ERROR, "Failed to request mode switch for device %i-%i (%i)", user_data->bus, user_data->address, transfer->status);
+ free(transfer->user_data);
+ return;
+ }
+
+ unsigned char *data = libusb_control_transfer_get_data(transfer);
+
+ usbmuxd_log(LL_INFO, "Received response %i for switch mode %i for device %i-%i", data[0], user_data->wIndex, user_data->bus, user_data->address);
+ free(transfer->user_data);
+}
+
+static void get_mode_cb(struct libusb_transfer* transfer) {
+ struct mode_user_data* user_data = transfer->user_data;
+ int res;
+
+ if(transfer->status != LIBUSB_TRANSFER_COMPLETED) {
+ usbmuxd_log(LL_ERROR, "Failed to request get mode for device %i-%i (%i)", user_data->bus, user_data->address, transfer->status);
+ free(transfer->user_data);
+ return;
+ }
+
+ unsigned char *data = libusb_control_transfer_get_data(transfer);
+
+ char* desired_mode = getenv(ENV_DEVICE_MODE);
+ if (!desired_mode) {
+ user_data->wIndex = 0x1;
+ }
+ else if (!strncmp(desired_mode, "2", 1)) {
+ user_data->wIndex = 0x2;
+ }
+ else if (!strncmp(desired_mode, "3", 1)) {
+ user_data->wIndex = 0x3;
+ }
+ // Response is 3:3:3 for initial mode, 5:3:3 otherwise.
+ // In later commit, should infer the mode from available configurations and interfaces.
+ usbmuxd_log(LL_INFO, "Received response %i:%i:%i for get_mode request for device %i-%i", data[0], data[1], data[2], user_data->bus, user_data->address);
+ if (user_data->wIndex > 1 && data[0] == 3 && data[1] == 3 && data[2] == 3) {
+ // 3:3:3 means the initial mode
+ usbmuxd_log(LL_WARNING, "Switching device %i-%i mode to %i", user_data->bus, user_data->address, user_data->wIndex);
+
+ user_data->bRequest = APPLE_VEND_SPECIFIC_SET_MODE;
+ user_data->wValue = 0;
+ user_data->wLength = 1;
+
+ if ((res = submit_vendor_specific(transfer->dev_handle, user_data, switch_mode_cb)) != 0) {
+ usbmuxd_log(LL_WARNING, "Could not request to switch mode %i for device %i-%i (%i)", user_data->wIndex, user_data->bus, user_data->address, res);
+ }
+ }
+ else {
+ // in other modes, usually 5:3:3
+ usbmuxd_log(LL_WARNING, "Skipping switch device %i-%i mode", user_data->bus, user_data->address);
+ free(transfer->user_data);
+ }
+}
+
static int usb_device_add(libusb_device* dev)
{
int j, res;
@@ -397,6 +477,25 @@ static int usb_device_add(libusb_device* dev)
return -1;
}
+ // On top of configurations, Apple have multiple "modes" for devices, namely:
+ // 1: An "initial" mode with 4 configurations
+ // 2: "Valeria" mode, where configuration 5 is included with interface for H.265 video capture (activated when recording screen with QuickTime in macOS)
+ // 3: "CDC NCM" mode, where configuration 5 is included with interface for Ethernet/USB (activated using internet-sharing feature in macOS)
+ // Request current mode asynchroniously, so it can be changed in callback if needed
+ usbmuxd_log(LL_INFO, "Requesting current mode from device %i-%i", bus, address);
+ struct mode_user_data* user_data = malloc(sizeof(struct mode_user_data));
+ user_data->bus = bus;
+ user_data->address = address;
+ user_data->bRequest = APPLE_VEND_SPECIFIC_GET_MODE;
+ user_data->wValue = 0;
+ user_data->wIndex = 0;
+ user_data->wLength = 4;
+ user_data->timeout = 1000;
+
+ if (submit_vendor_specific(handle, user_data, get_mode_cb) != 0) {
+ usbmuxd_log(LL_WARNING, "Could not request current mode from device %d-%d", bus, address);
+ }
+ // Potentially, the rest of this function can be factored out and called from get_mode_callback/switch_mode_callback (where desired mode is known)
int desired_config = devdesc.bNumConfigurations;
if (desired_config > 4) {
if (desired_config > 5) {
@@ -412,14 +511,16 @@ static int usb_device_add(libusb_device* dev)
desired_config = 4;
break;
}
- if (config->bNumInterfaces != 3) {
- usbmuxd_log(LL_WARNING, "Device %d-%d: Ignoring possibly bad configuration 5, choosing configuration 4 instead.", bus, address);
- desired_config = 4;
- break;
- }
- intf = &config->interface[2].altsetting[0];
- if (intf->bInterfaceClass != 0xFF || intf->bInterfaceSubClass != 0x2A || intf->bInterfaceProtocol != 0xFF) {
- usbmuxd_log(LL_WARNING, "Device %d-%d: Ignoring possibly bad configuration 5, choosing configuration 4 instead.", bus, address);
+ // In Valeria mode, there are 3 interfaces and usbmuxd is at 2
+ // In CDC NCM mode, there are 4 interfaces and usbmuxd is at 1
+ // Otherwize, 0 is expected to be of a different class.
+ int usbmux_intf_index = config->bNumInterfaces == 3 ? 2 : config->bNumInterfaces == 4 ? 1 : 0;
+ intf = &config->interface[usbmux_intf_index].altsetting[0];
+ if (
+ intf->bInterfaceClass != INTERFACE_CLASS ||
+ intf->bInterfaceSubClass != INTERFACE_SUBCLASS ||
+ intf->bInterfaceProtocol != INTERFACE_PROTOCOL) {
+ usbmuxd_log(LL_WARNING, "Device %d-%d: can't find usbmux interface in configuration 5, choosing configuration 4 instead.", bus, address);
desired_config = 4;
break;
}
diff --git a/src/usb.h b/src/usb.h
index b1b9bb9..4e44cce 100644
--- a/src/usb.h
+++ b/src/usb.h
@@ -50,6 +50,10 @@
#define PID_APPLE_SILICON_RESTORE_LOW 0x1901
#define PID_APPLE_SILICON_RESTORE_MAX 0x1905
+#define ENV_DEVICE_MODE "USBMUXD_DEFAULT_DEVICE_MODE"
+#define APPLE_VEND_SPECIFIC_GET_MODE 0x45
+#define APPLE_VEND_SPECIFIC_SET_MODE 0x52
+
struct usb_device;
int usb_init(void);