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-rw-r--r--src/usb.c146
1 files changed, 111 insertions, 35 deletions
diff --git a/src/usb.c b/src/usb.c
index e0fadfd..88d781d 100644
--- a/src/usb.c
+++ b/src/usb.c
@@ -61,6 +61,7 @@ struct usb_device {
int wMaxPacketSize;
uint64_t speed;
struct libusb_device_descriptor devdesc;
+ unsigned char transfer_buffer[1024 + LIBUSB_CONTROL_SETUP_SIZE];
};
static struct collection device_list;
@@ -258,6 +259,91 @@ static int start_rx_loop(struct usb_device *dev)
return 0;
}
+static void get_serial_callback(struct libusb_transfer *transfer)
+{
+ unsigned int di, si;
+ struct usb_device *usbdev = transfer->user_data;
+
+ if(transfer->status != LIBUSB_TRANSFER_COMPLETED) {
+ usbmuxd_log(LL_ERROR, "Failed to request serial for device %d-%d (%i)", usbdev->bus, usbdev->address, transfer->status);
+ libusb_free_transfer(transfer);
+ return;
+ }
+
+ /* De-unicode, taken from libusb */
+ unsigned char *data = libusb_control_transfer_get_data(transfer);
+ for (di = 0, si = 2; si < data[0] && di < sizeof(usbdev->serial)-1; si += 2) {
+ if ((data[si] & 0x80) || (data[si + 1])) /* non-ASCII */
+ usbdev->serial[di++] = '?';
+ else
+ usbdev->serial[di++] = data[si];
+ }
+ usbdev->serial[di] = 0;
+
+ usbmuxd_log(LL_INFO, "Got serial '%s' for device %d-%d", usbdev->serial, usbdev->bus, usbdev->address);
+
+ libusb_free_transfer(transfer);
+
+ /* Finish setup now */
+ if(device_add(usbdev) < 0) {
+ usb_disconnect(usbdev);
+ return;
+ }
+
+ // Spin up NUM_RX_LOOPS parallel usb data retrieval loops
+ // Old usbmuxds used only 1 rx loop, but that leaves the
+ // USB port sleeping most of the time
+ int rx_loops = NUM_RX_LOOPS;
+ for (rx_loops = NUM_RX_LOOPS; rx_loops > 0; rx_loops--) {
+ if(start_rx_loop(usbdev) < 0) {
+ usbmuxd_log(LL_WARNING, "Failed to start RX loop number %d", NUM_RX_LOOPS - rx_loops);
+ }
+ }
+
+ // Ensure we have at least 1 RX loop going
+ if (rx_loops == NUM_RX_LOOPS) {
+ usbmuxd_log(LL_FATAL, "Failed to start any RX loop for device %d-%d",
+ usbdev->bus, usbdev->address);
+ device_remove(usbdev);
+ usb_disconnect(usbdev);
+ return;
+ } else if (rx_loops > 0) {
+ usbmuxd_log(LL_WARNING, "Failed to start all %d RX loops. Going on with %d loops. "
+ "This may have negative impact on device read speed.",
+ NUM_RX_LOOPS, NUM_RX_LOOPS - rx_loops);
+ } else {
+ usbmuxd_log(LL_DEBUG, "All %d RX loops started successfully", NUM_RX_LOOPS);
+ }
+}
+
+static void get_langid_callback(struct libusb_transfer *transfer)
+{
+ int res;
+ struct usb_device *usbdev = transfer->user_data;
+
+ if(transfer->status != LIBUSB_TRANSFER_COMPLETED) {
+ usbmuxd_log(LL_ERROR, "Failed to request lang ID for device %d-%d (%i)", usbdev->bus,
+ usbdev->address, transfer->status);
+ libusb_free_transfer(transfer);
+ return;
+ }
+
+ unsigned char *data = libusb_control_transfer_get_data(transfer);
+ uint16_t langid = (uint16_t)(data[2] | (data[3] << 8));
+ usbmuxd_log(LL_INFO, "Got lang ID %u for device %d-%d", langid, usbdev->bus, usbdev->address);
+
+ /* re-use the same transfer */
+ libusb_fill_control_setup(usbdev->transfer_buffer, LIBUSB_ENDPOINT_IN, LIBUSB_REQUEST_GET_DESCRIPTOR,
+ (uint16_t)((LIBUSB_DT_STRING << 8) | usbdev->devdesc.iSerialNumber),
+ langid, sizeof(usbdev->transfer_buffer));
+ libusb_fill_control_transfer(transfer, usbdev->dev, usbdev->transfer_buffer, get_serial_callback, usbdev, 1000);
+
+ if((res = libusb_submit_transfer(transfer)) < 0) {
+ usbmuxd_log(LL_ERROR, "Could not request transfer for device %d-%d (%d)", usbdev->bus, usbdev->address, res);
+ libusb_free_transfer(transfer);
+ }
+}
+
static int usb_device_add(libusb_device* dev)
{
int j, res;
@@ -265,6 +351,7 @@ static int usb_device_add(libusb_device* dev)
uint8_t bus = libusb_get_bus_number(dev);
uint8_t address = libusb_get_device_address(dev);
struct libusb_device_descriptor devdesc;
+ struct libusb_transfer *transfer;
int found = 0;
FOREACH(struct usb_device *usbdev, &device_list) {
if(usbdev->bus == bus && usbdev->address == address) {
@@ -287,7 +374,8 @@ static int usb_device_add(libusb_device* dev)
return -1;
libusb_device_handle *handle;
usbmuxd_log(LL_INFO, "Found new device with v/p %04x:%04x at %d-%d", devdesc.idVendor, devdesc.idProduct, bus, address);
- // potentially blocking operations follow; they will only run when new devices are detected, which is acceptable
+ // No blocking operation can follow: it may be run in the libusb hotplug callback and libusb will refuse any
+ // blocking call
if((res = libusb_open(dev, &handle)) != 0) {
usbmuxd_log(LL_WARNING, "Could not open device %d-%d: %d", bus, address, res);
return -1;
@@ -386,14 +474,15 @@ static int usb_device_add(libusb_device* dev)
return -1;
}
- if((res = libusb_get_string_descriptor_ascii(handle, devdesc.iSerialNumber, (uint8_t *)usbdev->serial, 256)) <= 0) {
- usbmuxd_log(LL_WARNING, "Could not get serial number for device %d-%d: %d", bus, address, res);
- libusb_release_interface(handle, usbdev->interface);
+ transfer = libusb_alloc_transfer(0);
+ if(!transfer) {
+ usbmuxd_log(LL_WARNING, "Failed to allocate transfer for device %d-%d: %d", bus, address, res);
libusb_close(handle);
free(usbdev);
return -1;
}
- usbdev->serial[res] = 0;
+
+ usbdev->serial[0] = 0;
usbdev->bus = bus;
usbdev->address = address;
usbdev->devdesc = devdesc;
@@ -427,40 +516,27 @@ static int usb_device_add(libusb_device* dev)
usbmuxd_log(LL_INFO, "USB Speed is %g MBit/s for device %d-%d", (double)(usbdev->speed / 1000000.0), usbdev->bus, usbdev->address);
- collection_init(&usbdev->tx_xfers);
- collection_init(&usbdev->rx_xfers);
-
- collection_add(&device_list, usbdev);
-
- if(device_add(usbdev) < 0) {
- usb_disconnect(usbdev);
+ /**
+ * From libusb:
+ * Asking for the zero'th index is special - it returns a string
+ * descriptor that contains all the language IDs supported by the
+ * device.
+ **/
+ libusb_fill_control_setup(usbdev->transfer_buffer, LIBUSB_ENDPOINT_IN, LIBUSB_REQUEST_GET_DESCRIPTOR, LIBUSB_DT_STRING << 8, 0, sizeof(usbdev->transfer_buffer));
+ libusb_fill_control_transfer(transfer, handle, usbdev->transfer_buffer, get_langid_callback, usbdev, 1000);
+
+ if((res = libusb_submit_transfer(transfer)) < 0) {
+ usbmuxd_log(LL_ERROR, "Could not request transfer for device %d-%d (%d)", usbdev->bus, usbdev->address, res);
+ libusb_free_transfer(transfer);
+ libusb_close(handle);
+ free(usbdev);
return -1;
}
- // Spin up NUM_RX_LOOPS parallel usb data retrieval loops
- // Old usbmuxds used only 1 rx loop, but that leaves the
- // USB port sleeping most of the time
- int rx_loops = NUM_RX_LOOPS;
- for (rx_loops = NUM_RX_LOOPS; rx_loops > 0; rx_loops--) {
- if(start_rx_loop(usbdev) < 0) {
- usbmuxd_log(LL_WARNING, "Failed to start RX loop number %d", NUM_RX_LOOPS - rx_loops);
- }
- }
+ collection_init(&usbdev->tx_xfers);
+ collection_init(&usbdev->rx_xfers);
- // Ensure we have at least 1 RX loop going
- if (rx_loops == NUM_RX_LOOPS) {
- usbmuxd_log(LL_FATAL, "Failed to start any RX loop for device %d-%d",
- usbdev->bus, usbdev->address);
- device_remove(usbdev);
- usb_disconnect(usbdev);
- return -1;
- } else if (rx_loops > 0) {
- usbmuxd_log(LL_WARNING, "Failed to start all %d RX loops. Going on with %d loops. "
- "This may have negative impact on device read speed.",
- NUM_RX_LOOPS, NUM_RX_LOOPS - rx_loops);
- } else {
- usbmuxd_log(LL_DEBUG, "All %d RX loops started successfully", NUM_RX_LOOPS);
- }
+ collection_add(&device_list, usbdev);
return 0;
}
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