hmcfgusb: add possibility to use a specific HM-CFG-USB with -S

[hmcfgusb] / hmcfgusb.c

diff --git a/hmcfgusb.c b/hmcfgusb.c
index e3cde0f74a6897eb9009f19d23e3f25b292fcd1f..c82613f77dbf3997b7df0d030c6f818ff4751694 100644 (file)
--- a/hmcfgusb.c
+++ b/hmcfgusb.c
@@ -99,7 +99,7 @@ static char * usb_strerror(int e)
        return unknerr;
 }
 
-static libusb_device_handle *hmcfgusb_find(int vid, int pid) {
+static libusb_device_handle *hmcfgusb_find(int vid, int pid, char *serial) {
        libusb_device_handle *devh = NULL;
        libusb_device **list;
        ssize_t cnt;
@@ -129,6 +129,26 @@ static libusb_device_handle *hmcfgusb_find(int vid, int pid) {
                                return NULL;
                        }
 
+                       if (serial) {
+                               if (desc.iSerialNumber > 0) {
+                                       uint8_t devSerial[256];
+                                       err = libusb_get_string_descriptor_ascii(devh, desc.iSerialNumber, devSerial, sizeof(devSerial));
+                                       if (err < 0) {
+                                               fprintf(stderr, "Can't read serial-number: %s\n", usb_strerror(err));
+                                               libusb_close(devh);
+                                               libusb_free_device_list(list, 1);
+                                               return NULL;
+                                       }
+                                       if (strcmp((char*)devSerial, (char*)serial)) {
+                                               libusb_close(devh);
+                                               continue;
+                                       }
+                               } else {
+                                       libusb_close(devh);
+                                       continue;
+                               }
+                       }
+
                        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));
@@ -262,15 +282,7 @@ static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
                                fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_strerror(transfer->status));
 
                        quit = EIO;
-
-                       libusb_free_transfer(transfer);
-                       if (cb_data) {
-                               if (cb_data->dev && cb_data->dev->transfer) {
-                                       cb_data->dev->transfer = NULL;
-                               }
-                               free(cb_data);
-                       }
-                       return;
+                       goto out;
                }
        } else {
                if (cb_data && cb_data->cb) {
@@ -279,14 +291,7 @@ static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
 
                        if (!cb_data->cb(transfer->buffer, transfer->actual_length, cb_data->data)) {
                                quit = EIO;
-
-                               libusb_free_transfer(transfer);
-                               if (cb_data && cb_data->dev && cb_data->dev->transfer) {
-                                       cb_data->dev->transfer = NULL;
-                                       free(cb_data);
-                               }
-
-                               return;
+                               goto out;
                        }
                } else {
                        hexdump(transfer->buffer, transfer->actual_length, "> ");
@@ -296,16 +301,22 @@ static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
        err = libusb_submit_transfer(transfer);
        if (err != 0) {
                fprintf(stderr, "Can't re-submit transfer: %s\n", usb_strerror(err));
-               libusb_free_transfer(transfer);
-               if (cb_data) {
-                       if (cb_data->dev)
-                               cb_data->dev->transfer = NULL;
-                       free(cb_data);
+               goto out;
+       }
+
+       return;
+
+out:
+       libusb_free_transfer(transfer);
+       if (cb_data) {
+               if (cb_data->dev && cb_data->dev->transfer) {
+                       cb_data->dev->transfer = NULL;
                }
+               free(cb_data);
        }
 }
 
-struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data)
+struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data, char *serial)
 {
        libusb_device_handle *devh = NULL;
        const struct libusb_pollfd **usb_pfd = NULL;
@@ -324,11 +335,15 @@ struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data)
        }
        libusb_initialized = 1;
 
-       devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT);
+       devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT, serial);
        if (!devh) {
-               devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT_BL);
+               devh = hmcfgusb_find(ID_VENDOR, ID_PRODUCT_BL, serial);
                if (!devh) {
-                       fprintf(stderr, "Can't find/open hmcfgusb!\n");
+                       if (serial) {
+                               fprintf(stderr, "Can't find/open HM-CFG-USB with serial %s!\n", serial);
+                       } else {
+                               fprintf(stderr, "Can't find/open HM-CFG-USB!\n");
+                       }
 #ifdef NEED_LIBUSB_EXIT
                        hmcfgusb_exit();
 #endif