libftdi: Patch ftdi_eeprom to support Google FTDI based debug boards.

Patch allows user to change default vid/pid of FTDI (0403:60xx) to
any vid:pid via command line arguments (-v & -p).
Additionally patch allows caller to set the USB serialname from the
command line (-s).

See crbug.com/242980 for details
diff --git a/ftdi_eeprom/main.c b/ftdi_eeprom/main.c
index 2592796..8a3585e 100644
--- a/ftdi_eeprom/main.c
+++ b/ftdi_eeprom/main.c
@@ -35,6 +35,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <getopt.h>
 
 #include <confuse.h>
 #include <libusb.h>
@@ -147,8 +148,10 @@ int main(int argc, char *argv[])
     normal variables
     */
     int _read = 0, _erase = 0, _flash = 0;
+    unsigned int _vendor = 0, _product = 0;
 
     const int max_eeprom_size = 256;
+    char _serial[max_eeprom_size];
     int my_eeprom_size = 0;
     unsigned char *eeprom_buf = NULL;
     char *filename;
@@ -161,39 +164,67 @@ int main(int argc, char *argv[])
     printf("\nFTDI eeprom generator v%s\n", EEPROM_VERSION_STRING);
     printf ("(c) Intra2net AG and the libftdi developers <opensource@intra2net.com>\n");
 
-    if (argc != 2 && argc != 3)
-    {
-        printf("Syntax: %s [commands] config-file\n", argv[0]);
-        printf("Valid commands:\n");
-        printf("--read-eeprom  Read eeprom and write to -filename- from config-file\n");
-        printf("--erase-eeprom  Erase eeprom\n");
-        printf("--flash-eeprom  Flash eeprom\n");
-        exit (-1);
-    }
+    int longval;
+    struct option long_options[] = {
+      {"read-eeprom", no_argument, &_read, 1},
+      {"erase-eeprom", no_argument, &_erase, 1},
+      {"flash-eeprom", no_argument, &_flash, 1},
+      {"vendor", required_argument, &longval, 'v'},
+      {"product", required_argument, &longval, 'p'},
+      {"serial", optional_argument, &longval, 's'},
+      {0, 0, 0, 0}
+    };
 
-    if (argc == 3)
-    {
-        if (strcmp(argv[1], "--read-eeprom") == 0)
-            _read = 1;
-        else if (strcmp(argv[1], "--erase-eeprom") == 0)
-            _erase = 1;
-        else if (strcmp(argv[1], "--flash-eeprom") == 0)
-            _flash = 1;
-        else
-        {
-            printf ("Can't open configuration file\n");
-            exit (-1);
-        }
-        argc_filename = 2;
+    int option_index = 0;
+    char c;
+    while ((c = getopt_long(argc, argv, "v:p:s:",
+                            long_options, &option_index)) != -1)  {
+      switch (c) {
+        case 'v':
+          _vendor = strtoul(optarg, NULL, 0);
+          break;
+        case 'p':
+          _product = strtoul(optarg, NULL, 0);
+          break;
+        case 's':
+          strcpy(_serial, optarg);
+          break;
+        case 0:
+          switch (longval) {
+            case 'v':
+              _vendor = strtoul(optarg, NULL, 0);
+              break;
+            case 'p':
+              _product = strtoul(optarg, NULL, 0);
+              break;
+            case 's':
+              strcpy(_serial, optarg);
+              break;
+            default:
+              break;
+          }
+        default:
+          break;
+      }
     }
-    else
+
+    if (!_read & !_erase & !_flash)
     {
-        argc_filename = 1;
+        printf("Syntax: %s [switches|command] config-file\n", argv[0]);
+        printf("Valid commands:\n");
+        printf("--read-eeprom        Read eeprom and write to -filename- from config-file\n");
+        printf("--erase-eeprom       Erase eeprom\n");
+        printf("--flash-eeprom       Flash eeprom\n");
+        printf("--vendor|-v <num>    Vendor id to probe for on USB\n");
+        printf("--product|-p <num>   Product id to probe for on USB\n");
+        printf("--serial|-s <string> Serial string to override\n");
+        exit (-1);
     }
+    argc_filename = optind;
 
     if ((fp = fopen(argv[argc_filename], "r")) == NULL)
     {
-        printf ("Can't open configuration file\n");
+        printf ("Can't open configuration file %s\n", argv[argc_filename]);
         exit (-1);
     }
     fclose (fp);
@@ -221,22 +252,26 @@ int main(int argc, char *argv[])
 
         if (i != 0)
         {
-            int default_pid = cfg_getint(cfg, "default_pid");
-            printf("Unable to find FTDI devices under given vendor/product id: 0x%X/0x%X\n", vendor_id, product_id);
+            printf("Unable to find FTDI devices under given vendor/product id: 0x%04x/0x%04x\n",
+                   vendor_id, product_id);
             printf("Error code: %d (%s)\n", i, ftdi_get_error_string(ftdi));
-            printf("Retrying with default FTDI pid=%#04x.\n", default_pid);
-
-            i = ftdi_usb_open(ftdi, 0x0403, default_pid);
+            printf("Retrying with id:0x%04x/0x%04x\n", _vendor, _product);
+            i = ftdi_usb_open(ftdi, _vendor, _product);
             if (i != 0)
             {
                 printf("Error: %s\n", ftdi->error_str);
                 exit (-1);
             }
+            vendor_id = _vendor;
+            product_id = _product;
         }
+        printf("Found device at id:0x%04x/0x%04x\n",
+               vendor_id, product_id);
     }
     ftdi_eeprom_initdefaults (ftdi, cfg_getstr(cfg, "manufacturer"),
                               cfg_getstr(cfg, "product"),
-                              cfg_getstr(cfg, "serial"));
+                              (_serial[0] == '\0') ?
+                              cfg_getstr(cfg, "serial") : _serial);
 
     printf("FTDI read eeprom: %d\n", ftdi_read_eeprom(ftdi));
     eeprom_get_value(ftdi, CHIP_SIZE, &my_eeprom_size);
@@ -280,7 +315,8 @@ int main(int argc, char *argv[])
     eeprom_set_value(ftdi, OUT_IS_ISOCHRONOUS, cfg_getbool(cfg, "out_is_isochronous"));
     eeprom_set_value(ftdi, SUSPEND_PULL_DOWNS, cfg_getbool(cfg, "suspend_pull_downs"));
 
-    eeprom_set_value(ftdi, USE_SERIAL, cfg_getbool(cfg, "use_serial"));
+    int use_serial = (_serial[0] == '\0') ? cfg_getbool(cfg, "use_serial") : 1;
+    eeprom_set_value(ftdi, USE_SERIAL, use_serial);
     eeprom_set_value(ftdi, USE_USB_VERSION, cfg_getbool(cfg, "change_usb_version"));
     eeprom_set_value(ftdi, USB_VERSION, cfg_getint(cfg, "usb_version"));
     eeprom_set_value(ftdi, CHIP_TYPE, cfg_getint(cfg, "eeprom_type"));