From: Uwe Bonnes <bon@elektron.ikp.physik.tu-darmstadt.de>
Date: Wed, 8 Sep 2010 13:50:06 +0000 (+0200)
Subject: Remove ftdi_read_eeprom_getsize() function. Integrate in into the ftdi_read_eeprom... 
X-Git-Tag: v1.0rc1~133^2~126
X-Git-Url: http://developer.intra2net.com/git/?p=libftdi;a=commitdiff_plain;h=2d543486ed96287e3d0f8f33d82321dfc2f835d0

Remove ftdi_read_eeprom_getsize() function. Integrate in into the ftdi_read_eeprom() function. On ftdi_eeprom_write() another approach is needed
---

diff --git a/src/ftdi.c b/src/ftdi.c
index b251887..36bcf3b 100644
--- a/src/ftdi.c
+++ b/src/ftdi.c
@@ -2705,12 +2705,24 @@ int ftdi_read_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom)
     if (ftdi == NULL || ftdi->usb_dev == NULL)
         ftdi_error_return(-2, "USB device unavailable");
 
-    for (i = 0; i < ftdi->eeprom->size/2; i++)
+    for (i = 0; i < FTDI_MAX_EEPROM_SIZE/2; i++)
     {
         if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE, SIO_READ_EEPROM_REQUEST, 0, i, eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2)
             ftdi_error_return(-1, "reading eeprom failed");
     }
 
+    if (ftdi->type == TYPE_R)
+        ftdi->eeprom->size = 0xa0;
+    /*    Guesses size of eeprom by comparing halves 
+          - will not work with blank eeprom */
+    else if (strrchr((const char *)eeprom, 0xff) == ((const char *)eeprom +FTDI_MAX_EEPROM_SIZE -1))
+        ftdi->eeprom->size = -1;
+    else if(memcmp(eeprom,&eeprom[0x80],0x80) == 0)
+        ftdi->eeprom->size = 0x80;
+    else if(memcmp(eeprom,&eeprom[0x40],0x40) == 0)
+        ftdi->eeprom->size = 0x40;
+    else
+        ftdi->eeprom->size = 0x100;
     return 0;
 }
 
@@ -2766,43 +2778,6 @@ int ftdi_read_chipid(struct ftdi_context *ftdi, unsigned int *chipid)
 }
 
 /**
-    Guesses size of eeprom by reading eeprom and comparing halves - will not work with blank eeprom
-    Call this function then do a write then call again to see if size changes, if so write again.
-
-    \param ftdi pointer to ftdi_context
-    \param eeprom Pointer to store eeprom into
-    \param maxsize the size of the buffer to read into
-
-    \retval -1: eeprom read failed
-    \retval -2: USB device unavailable
-    \retval >=0: size of eeprom
-*/
-int ftdi_read_eeprom_getsize(struct ftdi_context *ftdi, unsigned char *eeprom, int maxsize)
-{
-    int i=0,j,minsize=32;
-    int size=minsize;
-
-    if (ftdi == NULL || ftdi->usb_dev == NULL)
-        ftdi_error_return(-2, "USB device unavailable");
-
-    do
-    {
-        for (j = 0; i < maxsize/2 && j<size; j++)
-        {
-            if (libusb_control_transfer(ftdi->usb_dev, FTDI_DEVICE_IN_REQTYPE,
-                                        SIO_READ_EEPROM_REQUEST, 0, i,
-                                        eeprom+(i*2), 2, ftdi->usb_read_timeout) != 2)
-                ftdi_error_return(-1, "eeprom read failed");
-            i++;
-        }
-        size*=2;
-    }
-    while (size<=maxsize && memcmp(eeprom,&eeprom[size/2],size/2)!=0);
-
-    return size/2;
-}
-
-/**
     Write eeprom location
 
     \param ftdi pointer to ftdi_context
diff --git a/src/ftdi.h b/src/ftdi.h
index b02ed04..d186ee1 100644
--- a/src/ftdi.h
+++ b/src/ftdi.h
@@ -451,7 +451,6 @@ extern "C"
        the checksum of the eeprom is valided */
     int ftdi_read_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom);
     int ftdi_read_chipid(struct ftdi_context *ftdi, unsigned int *chipid);
-    int ftdi_read_eeprom_getsize(struct ftdi_context *ftdi, unsigned char *eeprom, int maxsize);
     int ftdi_write_eeprom(struct ftdi_context *ftdi, unsigned char *eeprom);
     int ftdi_erase_eeprom(struct ftdi_context *ftdi);