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libraries/WiFi/extras/wifiHD/src/fw_download_extflash.c

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+/*! \page License
+ * Copyright (C) 2009, H&D Wireless AB All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of H&D Wireless AB may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY H&D WIRELESS AB ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND
+ * SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <top_defs.h>
+#include <wl_api.h>
+#include <fw_download.h>
+#include <nvram.h>
+#include <printf-stdarg.h>
+
+int fw_download_init(void)
+{
+        nvram_init();
+        return 0;
+}
+
+#define BUF_SIZE 512
+
+
+size_t fw_read_cb(void* ctx, 
+                  const uint8_t** buf, 
+                  size_t offset, 
+                  size_t len)
+{
+        static uint8_t* fw_buf = NULL;
+        size_t rlen;
+        /* when firmware download is completed, this function will be
+         * invoked one additional time with buf set to NULL. we can
+         * free the firmware buffer at this time since it's no longer
+         * needed.
+         */
+        if (NULL == buf) {
+                if (fw_buf) {
+                        free(fw_buf);
+                        fw_buf = NULL;
+                }
+                return 0;
+        }
+
+        /* first call? then initialize flash and allocate a buffer to hold
+         * firmware data.
+         */
+        if (fw_buf == NULL) {
+                fw_buf = malloc(BUF_SIZE);
+                
+                if (fw_buf == NULL) {
+                        printk("could not allocate firmware buffer\n");
+                        return 0;
+                }
+        }
+        /* read at most a full buffer */
+	rlen = len > BUF_SIZE ? BUF_SIZE : len;
+        
+        /* read data and update output parameters */
+        nvram_read(offset, fw_buf, rlen);
+	*buf = fw_buf;
+
+        return rlen;
+}