X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/hmcfgusb/blobdiff_plain/27bb301b7f08c691d95bed7b935a0c0a0144373d..d57fdaf62fa1ce7e8573404206903ad281ff889c:/hmcfgusb.c

diff --git a/hmcfgusb.c b/hmcfgusb.c
index 9b00c84..1a6bb76 100644
--- a/hmcfgusb.c
+++ b/hmcfgusb.c
@@ -34,7 +34,7 @@
 #include "hexdump.h"
 #include "hmcfgusb.h"
 
-#define USB_TIMEOUT		10000
+#define USB_TIMEOUT	10000
 
 #define ID_VENDOR	0x1b1f
 #define ID_PRODUCT	0xc00f
@@ -46,7 +46,10 @@
 #define EP_OUT		0x02
 #define EP_IN		0x83
 
+#define INTERFACE	0
+
 static int quit = 0;
+static int debug = 0;
 
 /* Not in all libusb-1.0 versions, so we have to roll our own :-( */
 static char * usb_strerror(int e)
@@ -116,13 +119,13 @@ static libusb_device_handle *hmcfgusb_find() {
 				return NULL;
 			}
 
-			err = libusb_detach_kernel_driver(devh, 0);
+			err = libusb_detach_kernel_driver(devh, INTERFACE);
 			if ((err != 0) && (err != LIBUSB_ERROR_NOT_FOUND)) {
 				fprintf(stderr, "Can't detach kernel driver: %s\n", usb_strerror(err));
 				return NULL;
 			}
 
-			err = libusb_claim_interface(devh, 0);
+			err = libusb_claim_interface(devh, INTERFACE);
 			if ((err != 0)) {
 				fprintf(stderr, "Can't claim interface: %s\n", usb_strerror(err));
 				return NULL;
@@ -140,13 +143,12 @@ int hmcfgusb_send(struct hmcfgusb_dev *usbdev, unsigned char* send_data, int len
 {
 	int err;
 	int cnt;
-	int ret;
 
+	if (debug)
+		hexdump(send_data, len, "USB < ");
 	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, len, &cnt, USB_TIMEOUT);
 	if (err) {
 		fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
-		if (err == LIBUSB_ERROR_NO_DEVICE)
-			exit(EXIT_FAILURE);
 		return 0;
 	}
 
@@ -154,13 +156,11 @@ int hmcfgusb_send(struct hmcfgusb_dev *usbdev, unsigned char* send_data, int len
 		err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, 0, &cnt, USB_TIMEOUT);
 		if (err) {
 			fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
-			if (err == LIBUSB_ERROR_NO_DEVICE)
-				exit(EXIT_FAILURE);
 			return 0;
 		}
 	}
 
-	return ret;
+	return 1;
 }
 
 static struct libusb_transfer *hmcfgusb_prepare_int(libusb_device_handle *devh, libusb_transfer_cb_fn cb, void *data)
@@ -185,7 +185,7 @@ static struct libusb_transfer *hmcfgusb_prepare_int(libusb_device_handle *devh,
 	libusb_fill_interrupt_transfer(transfer, devh, EP_IN,
 			data_buf, ASYNC_SIZE, cb, data, USB_TIMEOUT);
 
-	transfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK;
+	transfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK | LIBUSB_TRANSFER_FREE_BUFFER;
 
 	err = libusb_submit_transfer(transfer);
 	if (err != 0) {
@@ -199,6 +199,7 @@ static struct libusb_transfer *hmcfgusb_prepare_int(libusb_device_handle *devh,
 }
 
 struct hmcfgusb_cb_data {
+	struct hmcfgusb_dev *dev;
 	hmcfgusb_cb_fn cb;
 	void *data;
 };
@@ -208,18 +209,26 @@ static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
 	int err;
 	struct hmcfgusb_cb_data *cb_data;
 
+	cb_data = transfer->user_data;
+
 	if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
 		if (transfer->status != LIBUSB_TRANSFER_TIMED_OUT) {
 			fprintf(stderr, "Interrupt transfer not completed: %d!\n", transfer->status);
 			quit = EIO;
+
+			if (cb_data && cb_data->dev && cb_data->dev->transfer) {
+				libusb_free_transfer(cb_data->dev->transfer);
+				cb_data->dev->transfer = NULL;
+			}
 			return;
 		}
 	} else {
-		cb_data = transfer->user_data;
 		if (cb_data && cb_data->cb) {
+			if (debug)
+				hexdump(transfer->buffer, transfer->actual_length, "USB > ");
 			cb_data->cb(transfer->buffer, transfer->actual_length, cb_data->data);
 		} else {
-			hexdump(transfer->buffer, transfer->actual_length, "RECV> ");
+			hexdump(transfer->buffer, transfer->actual_length, "> ");
 		}
 	}
 
@@ -269,6 +278,7 @@ struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data)
 
 	memset(cb_data, 0, sizeof(struct hmcfgusb_cb_data));
 
+	cb_data->dev = dev;
 	cb_data->cb = cb;
 	cb_data->data = data;
 
@@ -307,6 +317,8 @@ struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data)
 
 	dev->n_pfd = dev->n_usb_pfd;
 
+	quit = 0;
+
 	return dev;
 }
 
@@ -360,6 +372,7 @@ int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
 		n = poll(dev->pfd, dev->n_pfd, tv.tv_sec * 1000);
 		if (n < 0) {
 			perror("poll");
+			errno = 0;
 			return -1;
 		} else if (n == 0) {
 			usb_event = 1;
@@ -370,6 +383,7 @@ int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
 						usb_event = 1;
 						break;
 					} else {
+						errno = 0;
 						return dev->pfd[fd_n].fd;
 					}
 				}
@@ -387,8 +401,36 @@ int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout)
 		}
 	}
 
-	if (quit)
+	errno = 0;
+	if (quit) {
+		fprintf(stderr, "closing device-connection due to error %d\n", quit);
 		errno = quit;
+	}
 
 	return -1;
 }
+
+void hmcfgusb_close(struct hmcfgusb_dev *dev)
+{
+	int err;
+
+	if (dev->transfer) {
+		libusb_cancel_transfer(dev->transfer);
+	}
+
+	err = libusb_release_interface(dev->usb_devh, INTERFACE);
+	if ((err != 0)) {
+		fprintf(stderr, "Can't release interface: %s\n", usb_strerror(err));
+	}
+
+	libusb_close(dev->usb_devh);
+	free(dev->pfd);
+	free(dev);
+
+	libusb_exit(NULL);
+}
+
+void hmcfgusb_set_debug(int d)
+{
+	debug = d;
+}