firmware: fix maximum size
[hmcfgusb] / hmcfgusb.c
index 652eb42..90e82f2 100644 (file)
@@ -1,6 +1,6 @@
 /* HM-CFG-USB libusb-driver
  *
- * Copyright (c) 2013 Michael Gernoth <michael@gernoth.net>
+ * Copyright (c) 2013-16 Michael Gernoth <michael@gernoth.net>
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to
@@ -61,7 +61,7 @@ static int debug = 0;
 static int libusb_initialized = 0;
 
 /* Not in all libusb-1.0 versions, so we have to roll our own :-( */
-static char * usb_strerror(int e)
+static const char* usb_strerror(int e)
 {
        static char unknerr[256];
 
@@ -99,7 +99,31 @@ static char * usb_strerror(int e)
        return unknerr;
 }
 
-static libusb_device_handle *hmcfgusb_find(int vid, int pid) {
+static const char* usb_str_transfer_status(int e)
+{
+       static char unknerr[256];
+
+       switch (e) {
+               case LIBUSB_TRANSFER_COMPLETED:
+                       return "Transfer completed";
+               case LIBUSB_TRANSFER_ERROR:
+                       return "Transfer error";
+               case LIBUSB_TRANSFER_TIMED_OUT:
+                       return "Transfer timed out";
+               case LIBUSB_TRANSFER_CANCELLED:
+                       return "Transfer cancelled";
+               case LIBUSB_TRANSFER_STALL:
+                       return "For bulk/interrupt endpoints: endpoint stalled. For control endpoints: control request not supported.";
+               case LIBUSB_TRANSFER_NO_DEVICE:
+                       return "No device";
+               case LIBUSB_TRANSFER_OVERFLOW:
+                       return "Transfer overflow";
+       };
+       snprintf(unknerr, sizeof(unknerr), "Unknown transfer status %d / 0x%02x", e, e);
+       return unknerr;
+}
+
+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 +153,26 @@ 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));
@@ -259,7 +303,7 @@ static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
        if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
                if (transfer->status != LIBUSB_TRANSFER_TIMED_OUT) {
                        if (transfer->status != LIBUSB_TRANSFER_CANCELLED)
-                               fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_strerror(transfer->status));
+                               fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_str_transfer_status(transfer->status));
 
                        quit = EIO;
                        goto out;
@@ -296,7 +340,7 @@ out:
        }
 }
 
-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;
@@ -315,11 +359,15 @@ 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
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