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authorGravatar Mikkel Kamstrup Erlandsen2014-03-19 21:28:29 +0100
committerGravatar Martin Szulecki2014-03-24 17:01:30 +0100
commitd06ea10f14a806f2770507cd179b62c0d4eda6a2 (patch)
tree66211f7e5314664e92f5bb2d5a97b788ecd87da9 /src/usb-linux.c
parent427da9b898ad6d6d6b091b375f9fc38f155b4813 (diff)
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usb-linux: add some explanatory comments to usb-linux.c
Diffstat (limited to 'src/usb-linux.c')
-rw-r--r--src/usb-linux.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/usb-linux.c b/src/usb-linux.c
index 127446a..94db8f2 100644
--- a/src/usb-linux.c
+++ b/src/usb-linux.c
@@ -93,6 +93,7 @@ static void usb_disconnect(struct usb_device *dev)
free(dev);
}
+// Callback from write operation
static void tx_callback(struct libusb_transfer *xfer)
{
struct usb_device *dev = xfer->user_data;
@@ -162,6 +163,9 @@ int usb_send(struct usb_device *dev, const unsigned char *buf, int length)
return 0;
}
+// Callback from read operation
+// Under normal operation this issues a new read transfer request immediately,
+// doing a kind of read-callback loop
static void rx_callback(struct libusb_transfer *xfer)
{
struct usb_device *dev = xfer->user_data;
@@ -206,6 +210,7 @@ static void rx_callback(struct libusb_transfer *xfer)
}
}
+// Start a read-callback loop for this device
static int start_rx(struct usb_device *dev)
{
int res;