[patch 2.6.12-rc3] dell_rbu: Resubmitting patch for new Dell BIOS update driver

[Abhay Salunke]

This is a resubmit of the patch after incorporating all the inputs from revieweres. 
This has the hotplug firmware interface as suggested by many. 
Currently it does not suport reading back the data; I am workingon it and will add 
that feature as new patch.

By making a contribution to this project, I certify that:
The contribution was created in whole or in part by me and I have the 
right to submit it under the open source license indicated in the file.

Signed-off-by: Abhay Salunke <Abhay_Salunke@xxxxxxxx>

Thanks,
Abhay Salunke
Software Engineer.
DELL Inc

diff -uprN linux-2.6.11.8.ORIG/Documentation/DELL_RBU.txt linux-2.6.11.8/Documentation/DELL_RBU.txt
--- linux-2.6.11.8.ORIG/Documentation/DELL_RBU.txt	1969-12-31 18:00:00.000000000 -0600
+++ linux-2.6.11.8/Documentation/DELL_RBU.txt	2005-06-02 13:23:36.358562176 -0500
@@ -0,0 +1,70 @@
+Purpose:
+Demonstrate the usage of the DELL_RBU (DELL Remote BIOS Update) driver
+for updating BIOS images on Dell hardware.
+
+Scope:
+This document discusses the functionality of the DELL_RBU driver. 
+This driver is required by BIOS update applications shipped by DELL for updating
+BIOS on DELL servers and client systems. 
+
+Overview:
+The rbu driver is designed to be running on 2.6 kernel. 
+This driver is one single dell_rbu.c file (approx 800 lines total).
+This driver utilizes the hotplug interface for downloading the BIOS update image 
+in the contiguous or packetized memory depending upon the update type.
+The BIOS then scans the memory to find the image and will then update itself. 
+There are basically two different mechanisms for writing the BIOS image in to 
+contiguous memory 
+1> By writing the image to one monolithic chunk of contiguous physical memory.
+2> By writing image in to smaller packet chunks of contiguous physical memory.
+The update mechanism is determined by the update application based on the 
+particular system type.
+
+Update mechanism using single physical chunk of memory:
+The rbu driver on its load time created the following entries in sysfs
+/sys/firmware/dell_rbu/monolithic/mono_name
+/sys/firmware/dell_rbu/monolithic/mono_size
+/sys/firmware/dell_rbu/packetized/packet_name
+/sys/firmware/dell_rbu/packetized/packet_size
+
+Steps to update the BIOS image:
+
+1> Copy the image file in to /lib/firmware 
+2> echo the image name in to /sys/firmware/dell_rbu/xxxx/xxxx_name
+
+This will generate a hotplug event and the data form the image file is
+transferred to the memory. 
+Here xxxx stands for the type of BIOS update mechanism chosen by choosing
+monolitich the image is copied to contiguous physical pages and by choosing
+the mechanism as packetized the image is treated as one single packet and the
+packet size is set to the first packet image size. If a new image packet of
+different size form the previous is copied then all the previous packets are
+freed and this packet's size is treated as new packet size.
+
+On a driver unload all the allocated memory is freed.
+The user should not unload the driver after downloading the new BIOS image  
+if it wants to update BIOS with that image.
+The user can overwrite the previously loaded monolithich image by echoing a 
+new file name string to /sys/firmware/dell_rbu/monolithic/mono_name. Make sure 
+the file is present in /lib/firmware.  If the image size is more than
+previous image then the previous image is freed and the new alocation is made. 
+
+The user can know of a successful allocation by readind the size files.
+cat /sys/firmware/dell_rbu/monolithic/mono_size
+
+Update using smaller chunks (packets) of contiguous memory:
+The disadvantage of contiguous allocation is that it may not be always possible
+to get that size of contiuguous chunk of avaliable physical pages as in most 
+Linux systems the memory gets fragmented immideately after a reboot.
+The update using smaller chunks fixes this issue; it also requires the BIOS on 
+the system to support this feature; the update application needs to query this 
+with the BIOS on the system before using this technique. 
+
+
+NOTE:
+Afte updating the BIOS image the appplication needs to communicate with the BIOS 
+for enabling the update on the next reboot. The application can then choose to 
+reboot the system imideately or not reboot the system and leave up to the user 
+to do a reboot.
+
+
diff -uprN linux-2.6.11.8.ORIG/drivers/firmware/dell_rbu.c linux-2.6.11.8/drivers/firmware/dell_rbu.c
--- linux-2.6.11.8.ORIG/drivers/firmware/dell_rbu.c	1969-12-31 18:00:00.000000000 -0600
+++ linux-2.6.11.8/drivers/firmware/dell_rbu.c	2005-06-02 13:28:48.821060656 -0500
@@ -0,0 +1,700 @@
+/*
+ * dell_rbu.c
+ * Bios Update driver for Dell systems
+ * Author: Dell Inc
+ *	   Abhay Salunke <abhay_salunke@xxxxxxxx>
+ *
+ * Copyright (C) 2005 Dell Inc.
+ *
+ * Remote BIOS Update (rbu) driver is used for updating DELL BIOS by creating 
+ * entries in the /sys file systems on Linux 2.6 and higher kernels.
+ * It uses the hotplug interface for getting the image in to memory.
+ * The driver supports two mechanism to update the BIOS namely contiguous and 
+ * packetized. Both these methods still require to have some application to set
+ * the  CMOS bit indicating the BIOS to update itself after a reboot.
+ * In both the methods the image file name needs to be specified for hotplugging
+ * the image file. 
+ *
+ * Contiguous method:
+ * This driver writes the incmoing data in a monolithic image by allocating 
+ * contiguos physical pages large enough to accomodate the incoming BIOS image 
+ * size.  
+ *
+ * Packetized method:
+ * The driver writes the incoming packet image by allocating a new packet on 
+ * every time the packet image name is written. 
+ * This driver requires an application to break the BIOS image in to fixed sized 
+ * packet chunks and each packet is written as a hotplug image.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License v2.0 as published by
+ * the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#include <linux/version.h>
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/blkdev.h>
+#include <linux/device.h>
+#include <linux/spinlock.h>
+#include <linux/moduleparam.h>
+#include "linux/firmware.h"
+#define BIOS_SCAN_LIMIT 0xffffffff
+MODULE_AUTHOR("Abhay Salunke <abhay_salunke@xxxxxxxx>");
+MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.0");
+
+#define MONOLITHIC (1)
+#define PACKETIZED (10)
+static struct _rbu_data {
+        void *image_update_buffer;
+        unsigned long image_update_buffer_size;
+        unsigned long bios_image_size;
+        unsigned long image_update_order_number;
+        spinlock_t lock;
+        unsigned long packet_read_count;
+        unsigned long packet_write_count;
+        unsigned long num_packets;
+        unsigned long packetsize;
+        char mono_image[256];
+        char packet_image[256];
+} rbu_data;
+
+struct packet_data{
+	struct list_head list;
+	size_t length;
+	void *data;
+	int ordernum;
+};
+
+static struct packet_data packet_data_head;
+
+
+static void init_packet_head(void)
+{
+	INIT_LIST_HEAD(&packet_data_head.list);
+	rbu_data.packet_write_count = 0;
+	rbu_data.packet_read_count = 0;
+	rbu_data.num_packets = 0;
+	rbu_data.packetsize = 0;
+}
+
+struct rbu_download_device {
+	int type;
+	struct kobject kobj;
+};
+
+static struct rbu_download_device *rbu_download_mono;
+
+static struct rbu_download_device *rbu_download_packet;
+
+static struct device rbu_device;
+
+static int fill_last_packet(void *data, size_t length)
+{
+        struct list_head *ptemp_list;
+        struct packet_data *ppacket = NULL;
+        int packet_count = 0;
+
+        pr_debug("fill_last_packet: entry \n");
+
+        /* check if we have any packets */
+        if (0 == rbu_data.num_packets) {
+                pr_debug("fill_last_packet: num_packets=0\n");
+                return -ENOMEM;
+        }
+
+        packet_count = rbu_data.num_packets;
+
+        ptemp_list = (&packet_data_head.list)->next;
+
+        while(--packet_count) {
+                ptemp_list = ptemp_list->next;
+        }
+
+        ppacket = list_entry(ptemp_list,struct packet_data, list);
+
+        if ((rbu_data.packet_write_count + length) > rbu_data.packetsize) {
+                printk(KERN_WARNING "fill_last_packet: packet size data "
+                                "overrun\n");
+                return -ENOMEM;
+        }
+
+        pr_debug("fill_last_packet : buffer = %p\n", ppacket->data);
+
+        /* copy the incoming data in to the new buffer */
+        memcpy((ppacket->data + rbu_data.packet_write_count),
+                data, length);
+
+        if ((rbu_data.packet_write_count + length) == rbu_data.packetsize) {
+                /*
+                 this was the last data chunk in the packet
+                 so reinitialize the packet data counter to zero
+                */
+                rbu_data.packet_write_count = 0;
+        } else {
+                rbu_data.packet_write_count += length;
+        }
+        pr_debug("fill_last_packet: exit \n");
+        return 0;
+}
+
+/*
+ get_free_pages_limited:
+ This is a helper function which allocates free pages based on an upper limit.
+ On x86_64 or 64 bit arch the memory allocation goes above 4GB space which is
+ not addressable by the BIOS. This function tries to get allocation below the
+ limit (4GB) address. It first tries to allocate memory normally using the
+ GFP_KERNEL argument if the incoming limit is non-zero and if the returned
+ physical memory address exceeds the upper limit, the allocated pages are freed
+ and the memory is reallocated using the GFP_DMA argument.
+*/
+static void *get_free_pages_limited(unsigned long size,
+                                    int *ordernum,
+                                    unsigned long limit)
+{
+        unsigned long img_buf_phys_addr;
+        void *pbuf = NULL;
+
+        *ordernum = get_order(size);
+        /*
+         Check if we are not getting a very large file.
+         This can happen as a user error in entering the file size
+        */
+        if (*ordernum == BITS_PER_LONG) {
+                pr_debug("get_free_pages_limited: Incoming size is"
+                        " very large\n");
+                return NULL;
+        }
+
+        /* try allocating a new buffer to fit the request */
+        pbuf =(unsigned char *)__get_free_pages(GFP_KERNEL, *ordernum);
+
+        if (pbuf != NULL) {
+                /* check if the image is with in limits */
+                img_buf_phys_addr = (unsigned long)virt_to_phys(pbuf);
+
+                if ((limit != 0) && ((img_buf_phys_addr + size) > limit)) {
+                        pr_debug("Got memory above 4GB range, free this "
+                                "and try with DMA memory\n");
+                        /* free this memory as we need it with in 4GB range */
+                        free_pages ((unsigned long)pbuf, *ordernum);
+                        /*
+                         Try allocating a new buffer from the GFP_DMA range
+                         as it is with in 16MB range.
+                        */
+                        pbuf =(unsigned char *)__get_free_pages(GFP_DMA,
+                                                *ordernum);
+                        if (pbuf == NULL)
+                                pr_debug("Failed to get memory of size %ld "
+                                        "using GFP_DMA\n", size);
+                }
+        }
+        return pbuf;
+}
+
+static int create_packet(size_t length)
+{
+        struct packet_data *newpacket;
+        int ordernum = 0;
+
+        pr_debug("create_packet: entry \n");
+
+        if (rbu_data.packetsize == 0 ) {
+                pr_debug("create_packet: packetsize not specified\n");
+                return -EINVAL;
+        }
+
+        newpacket = kmalloc(sizeof(struct packet_data) ,GFP_KERNEL);
+        if(newpacket == NULL) {
+                printk(KERN_WARNING "create_packet: failed to allocate new "
+                        "packet\n");
+                return -ENOMEM;
+        }
+
+        /* there is no upper limit on memory address for packetized mechanism*/
+        newpacket->data = get_free_pages_limited(rbu_data.packetsize,
+                                &ordernum, 0);
+        pr_debug("create_packet: newpacket %p\n", newpacket->data);
+
+        if(newpacket->data == NULL) {
+                printk(KERN_WARNING "create_packet: failed to allocate new "
+                        "packet\n");
+                kfree(newpacket);
+                return -ENOMEM;
+        }
+
+        newpacket->ordernum = ordernum;
+        ++rbu_data.num_packets;
+        /* initialize the newly created packet headers */
+        INIT_LIST_HEAD(&newpacket->list);
+        list_add_tail(&newpacket->list, &packet_data_head.list);
+        /* packets have fixed size*/
+        newpacket->length = rbu_data.packetsize;
+
+        pr_debug("create_packet: exit \n");
+
+        return 0;
+}
+
+static int packetize_data(void *data, size_t length)
+{
+        int rc = 0;
+
+        if (rbu_data.packet_write_count == 0) {
+                if ((rc = create_packet(length)) != 0 )
+                        return rc;
+        }
+        /* fill data in to the packet */
+        if ((rc = fill_last_packet(data, length)) != 0)
+                return rc;
+
+        return rc;
+}
+
+/*
+ do_packet_read :
+ This is a helper function which reads the packet data of the
+ current list.
+ data: is the incoming buffer
+ ptemp_list: points to the incoming list item
+ length: is the length of the free space in the buffer.
+ bytes_read: is the total number of bytes read already from
+ the packet list
+ list_read_count: is the counter to keep track of the number
+ of bytes read out of each packet.
+*/
+int do_packet_read(char *data,
+                   struct list_head *ptemp_list,
+                   int length,
+                   int bytes_read,
+                   int *list_read_count)
+{
+        void *ptemp_buf;
+        struct packet_data *newpacket = NULL;
+        int bytes_copied = 0;
+        int j = 0;
+
+        newpacket = list_entry(ptemp_list,struct packet_data, list);
+        *list_read_count += newpacket->length;
+
+        if (*list_read_count > bytes_read) {
+                /* point to the start of unread data */
+                j = newpacket->length - (*list_read_count - bytes_read);
+                /* point to the offset in the packet buffer*/
+                ptemp_buf = (u8 *)newpacket->data + j;
+                /* check if there is enough room in the incoming buffer*/
+                if (length > (*list_read_count - bytes_read))
+                        /* copy what ever is there in this packet and move on*/
+                        bytes_copied = (*list_read_count - bytes_read);
+                else
+                        /* copy the remaining */
+                        bytes_copied = length;
+                memcpy(data, ptemp_buf, bytes_copied);
+        }
+        return bytes_copied;
+}
+
+static void packet_empty_list(void)
+{
+        struct list_head *ptemp_list;
+        struct list_head *pnext_list;
+        struct packet_data *newpacket;
+
+        ptemp_list = (&packet_data_head.list)->next;
+        while(!list_empty(ptemp_list)) {
+                newpacket = list_entry(ptemp_list, struct packet_data, list);
+                pnext_list = ptemp_list->next;
+                list_del(ptemp_list);
+                ptemp_list = pnext_list;
+                /*
+                 zero out the RBU packet memory before freeing to make sure
+                 there are no stale RBU packets left in memory
+                */
+                memset(newpacket->data, 0, rbu_data.packetsize);
+                free_pages((unsigned long)newpacket->data, newpacket->ordernum);
+                kfree(newpacket);
+        }
+        rbu_data.packet_write_count = 0;
+        rbu_data.packet_read_count = 0;
+        rbu_data.num_packets = 0;
+}
+
+/*
+ img_update_free:
+ Frees the buffer allocated for storing BIOS image
+ Always called with lock held and returned with lock held
+*/
+static void img_update_free( void)
+{
+        if (rbu_data.image_update_buffer == NULL)
+                return;
+
+        /*
+         zero out this buffer before freeing it to get rid of any stale
+         BIOS image copied in memory.
+        */
+        memset(rbu_data.image_update_buffer, 0,
+                rbu_data.image_update_buffer_size);
+        free_pages((unsigned long)rbu_data.image_update_buffer,
+                rbu_data.image_update_order_number);
+        /* Re-initialize the rbu_data variables after a free */
+        rbu_data.image_update_buffer = NULL;
+        rbu_data.image_update_buffer_size = 0;
+        rbu_data.bios_image_size = 0;
+}
+
+/*
+ img_update_realloc:
+ This function allocates the contiguous pages to accomodate the requested
+ size of data. The memory address and size values are stored globally and
+ on every call to this function the new size is checked to see if more
+ data is required than the existing size. If true the previous memory is freed
+ and new allocation is done to accomodate the new size. If the incoming size is
+ less then than the already allocated size, then that  memory is reused.
+ This function is called with lock held and returna with lock held.
+*/
+static int img_update_realloc(unsigned long size)
+{
+        unsigned char *image_update_buffer = NULL;
+        unsigned long rc;
+        int ordernum =0;
+
+        /* check if the buffer of sufficient size has been already allocated */
+	if (rbu_data.image_update_buffer_size >= size) {
+        	/* check for corruption */
+                if ((size != 0) && (rbu_data.image_update_buffer == NULL)) {
+                        printk(KERN_ERR "img_update_realloc: corruption check "
+                                "failed\n");
+                        return -EINVAL;
+                }
+                /* we have a valid pre-allocated buffer with sufficient size */
+                return 0;
+    	}
+
+        /* free any previously allocated buffer */
+        img_update_free();
+
+        /*
+         This has already been called as locked so we can now unlock
+         and proceed to calling get_free_pages_limited as this function
+         can sleep
+        */
+        spin_unlock(&rbu_data.lock);
+
+        image_update_buffer = (unsigned char *)get_free_pages_limited(size,
+                &ordernum,
+                BIOS_SCAN_LIMIT);
+
+        /* acquire the spinlock again */
+        spin_lock(&rbu_data.lock);
+
+        if (image_update_buffer != NULL) {
+                rbu_data.image_update_buffer = image_update_buffer;
+                rbu_data.image_update_buffer_size = PAGE_SIZE << ordernum;
+                rbu_data.image_update_order_number = ordernum;
+                memset(rbu_data.image_update_buffer,0,
+                        rbu_data.image_update_buffer_size);
+                rc = 0;
+        } else {
+                pr_debug("Not enough memory for image update:order number = %d"
+                        ",size = %ld\n",ordernum, size);
+                rc = -ENOMEM;
+        }
+
+        return rc;
+} /* img_update_realloc */
+
+static ssize_t dummy_store (struct rbu_download_device *rbu_dev,
+                     const char *buf, size_t count, int type)
+{
+	/* do nothing */
+	return count; 
+}
+
+static ssize_t rbu_show_image_size (struct rbu_download_device *rbu_dev, 
+				    char *buf, int type)
+{
+        unsigned int size = 0;
+	if ( type == MONOLITHIC )
+		size = sprintf(buf, "%lu\n",  rbu_data.bios_image_size);
+	else
+		size = sprintf(buf, "%lu\n", rbu_data.packetsize);
+        return size;
+}
+
+static ssize_t rbu_show_image_name (struct rbu_download_device *rbu_dev, 
+				    char *buf, int type)
+{
+        unsigned int size = 0;
+        char *image;
+        
+	if (type == MONOLITHIC ) 
+		image = rbu_data.mono_image;
+	else
+		image = rbu_data.packet_image;
+
+	size = sprintf(buf, "%s\n", image);
+        return size;
+}
+
+static ssize_t rbu_store_image_name (struct rbu_download_device *rbu_dev, 
+				     const char *buf, size_t count, int type)
+{
+        int rc = count;
+        const struct firmware *fw_entry;
+	char *image_name = NULL;
+
+        spin_lock(&rbu_data.lock);
+
+        if (strlen(buf) < 256 ) {
+		if (type == MONOLITHIC ){
+                	sscanf(buf, "%s",rbu_data.mono_image);
+			image_name = rbu_data.mono_image;
+		} else {
+                	sscanf(buf, "%s",rbu_data.packet_image);
+			image_name = rbu_data.packet_image;
+		}
+
+		spin_unlock(&rbu_data.lock);	
+
+                rc = request_firmware(&fw_entry, image_name,
+                                &rbu_device);
+		if (rc) {
+                        printk(KERN_ERR "rbu_store_image_name: " 
+				"Firmware not available %d\n", rc);
+			return rc;
+		}
+			
+		pr_debug("rbu_store_image_name: "
+			"request_firmware is successful  "
+			"fw->size = %lu\n", fw_entry->size);
+
+		spin_lock(&rbu_data.lock);
+		if (type == MONOLITHIC ){
+			rbu_data.bios_image_size = fw_entry->size;
+			rc = img_update_realloc(fw_entry->size);
+			if (rc == 0) {
+				memcpy(rbu_data.image_update_buffer, 
+					fw_entry->data, fw_entry->size);
+				rc = count;
+			}
+		} else {
+			/* if a new packet is entered free all previsou 
+			   packets and start over.
+			 */
+			if ( rbu_data.packetsize != fw_entry->size )
+				packet_empty_list();
+
+			rbu_data.packetsize = fw_entry->size;
+			rc = packetize_data(fw_entry->data, fw_entry->size);
+			if ( rc == 0 )
+				rc = count;
+		}
+		spin_unlock(&rbu_data.lock);
+		release_firmware(fw_entry);
+        } else {
+		spin_unlock(&rbu_data.lock);
+		rc = -ENOMEM;
+	}
+
+        return rc;
+}
+
+/* no default attributes yet. */
+static struct attribute * def_attrs[] = { NULL, };
+
+struct rbu_attribute {
+	struct attribute attr;
+	ssize_t (*show) (struct rbu_download_device *rbu_dev,
+		char *buf, int type);
+	ssize_t (*store)(struct rbu_download_device *rbu_dev, 
+		const char *buf , size_t count, int type);
+	int type;
+};
+
+#define RBU_DEVICE_ATTR(_name,_mode,_show,_store, _type) \
+struct rbu_attribute rbu_attr_##_name = {       \
+	.attr ={.name= __stringify(_name), .mode= _mode, .owner= THIS_MODULE},\
+	.show = _show,                                \
+	.store = _store,                                \
+	.type = _type,	 \
+};
+
+#define to_rbu_attr(_attr) container_of(_attr,struct rbu_attribute,attr)
+#define to_rbu_download_device(obj)  \
+		container_of(obj,struct rbu_download_device,kobj)
+
+
+static RBU_DEVICE_ATTR(mono_name, 0644, rbu_show_image_name, 
+				rbu_store_image_name, MONOLITHIC);
+
+static RBU_DEVICE_ATTR(mono_size, 0444, rbu_show_image_size, 
+				dummy_store, MONOLITHIC);
+
+static RBU_DEVICE_ATTR(packet_name, 0644, rbu_show_image_name,
+                                rbu_store_image_name, PACKETIZED);
+
+static RBU_DEVICE_ATTR(packet_size, 0444, rbu_show_image_size,
+                                dummy_store, PACKETIZED);
+
+static  ssize_t rbu_attr_store (struct kobject *kobj,
+				struct attribute *attr,
+				const char *buf, 
+				size_t count) 
+{
+	struct rbu_download_device *rbu_dev = to_rbu_download_device(kobj);
+	struct rbu_attribute *rbu_attr = to_rbu_attr(attr);
+	ssize_t rc = count;
+
+	pr_debug("rbu_attr_store: entry type = %d\n", rbu_attr->type);
+	
+	if (rbu_attr->store)
+		rc = rbu_attr->store(rbu_dev, buf, count, rbu_attr->type);
+
+	return rc;
+}
+
+static ssize_t rbu_attr_show (struct kobject * kobj, 
+			      struct attribute *attr, 
+			      char *buf)
+{
+	struct rbu_download_device *rbu_dev = to_rbu_download_device(kobj);
+	struct rbu_attribute *rbu_attr = to_rbu_attr(attr);
+	ssize_t rc = 0;
+
+	pr_debug("rbu_attr_show: entry type = %d\n", rbu_attr->type);
+
+	if (rbu_attr->show)
+		rc = rbu_attr->show(rbu_dev, buf, rbu_attr->type);
+	return rc;
+}
+
+static struct sysfs_ops rbu_attr_ops = { 
+	.show = rbu_attr_show,
+	.store = rbu_attr_store,
+};
+
+static struct kobj_type ktype_dell_rbu = { 
+	.sysfs_ops	= &rbu_attr_ops,
+	.default_attrs	= def_attrs,
+};
+static decl_subsys(dell_rbu,&ktype_dell_rbu,NULL);
+
+static int rbu_download_device_register(struct rbu_download_device *rbu_dev, 
+					int type)
+{
+        int rc = 0;
+        if (!rbu_dev)
+                return 1;
+        memset(rbu_dev, 0, sizeof (*rbu_dev));
+	if (type == MONOLITHIC)
+        	kobject_set_name(&rbu_dev->kobj, "monolithic");
+	else 
+        	kobject_set_name(&rbu_dev->kobj, "packetized");
+        kobj_set_kset_s(rbu_dev,dell_rbu_subsys);
+        rc = kobject_register(&rbu_dev->kobj);
+        if (!rc) {
+		if (type == MONOLITHIC ) {
+			sysfs_create_file(&rbu_dev->kobj,
+				&rbu_attr_mono_name.attr);
+			sysfs_create_file(&rbu_dev->kobj,
+				&rbu_attr_mono_size.attr);
+		} else {
+			sysfs_create_file(&rbu_dev->kobj,
+				&rbu_attr_packet_name.attr);
+			sysfs_create_file(&rbu_dev->kobj,
+				&rbu_attr_packet_size.attr);
+		}
+	} else 
+		pr_debug("rbu_download_device_register: "
+			"kobject_register %d \n", rc);
+	pr_debug("rbu_download_device_register: rbu_dev addr %p\n", rbu_dev);
+        return rc;
+}
+
+static struct rbu_download_device *create_rbu_download_entry(int type) 
+{
+	struct rbu_download_device *rbu_dev = NULL;
+	rbu_dev = kmalloc( sizeof(struct rbu_download_device), 
+		GFP_KERNEL);
+	if (!rbu_dev) {
+		printk(KERN_ERR "create_rbu_download_entry: kmalloc failed\n");
+		return NULL;
+	}
+	rbu_dev->type = type;
+        if (rbu_download_device_register(rbu_dev, type))  {
+		pr_debug("create_rbu_download_entry: "
+			"rbu_download_device_register failed \n");
+		kfree(rbu_dev);
+        }
+
+	pr_debug("create_rbu_download_entry: rbu_dev %p\n", rbu_dev);	
+	return rbu_dev;
+}
+
+static void remove_rbu_download_entry(struct rbu_download_device *rbu_dev, 
+				       int type) 
+{
+	pr_debug("remove_rbu_download_entry: rbu_dev ptr %p \n", rbu_dev);	
+	if (rbu_dev != NULL) {
+		kobject_unregister(&rbu_dev->kobj);
+		kfree(rbu_dev);
+	}
+	
+}
+
+static int __init dcdrbu_init(void)
+{
+        int rc = 0;
+	spin_lock_init(&rbu_data.lock);
+	
+	init_packet_head();
+	
+        device_initialize(&rbu_device);
+
+	rc = firmware_register(&dell_rbu_subsys);
+        if (rc < 0) {
+                printk(KERN_WARNING "dcdrbu_init: firmware_register"
+			" dell_rbu failed\n");
+                return rc;
+        }
+	
+	rbu_download_mono = create_rbu_download_entry (MONOLITHIC);
+	if (rbu_download_mono == NULL) {	
+		firmware_unregister(&dell_rbu_subsys);
+		return -ENOMEM;
+	}
+	
+	rbu_download_packet=  create_rbu_download_entry (PACKETIZED);
+	if (rbu_download_packet == NULL) {	
+		remove_rbu_download_entry(rbu_download_mono, MONOLITHIC);
+		firmware_unregister(&dell_rbu_subsys);
+		return -ENOMEM;
+	}
+        strncpy(rbu_device.bus_id,"firmware", BUS_ID_SIZE);
+        return rc;
+}
+
+static __exit void dcdrbu_exit( void)
+{
+	spin_lock(&rbu_data.lock);
+        packet_empty_list();
+        img_update_free();
+        spin_unlock(&rbu_data.lock);
+	remove_rbu_download_entry(rbu_download_packet, PACKETIZED);
+	remove_rbu_download_entry(rbu_download_mono, MONOLITHIC);
+        firmware_unregister(&dell_rbu_subsys);
+}
+
+module_exit(dcdrbu_exit);
+module_init(dcdrbu_init);
+
diff -uprN linux-2.6.11.8.ORIG/drivers/firmware/Kconfig linux-2.6.11.8/drivers/firmware/Kconfig
--- linux-2.6.11.8.ORIG/drivers/firmware/Kconfig	2005-05-13 12:07:58.000000000 -0500
+++ linux-2.6.11.8/drivers/firmware/Kconfig	2005-05-13 12:07:00.000000000 -0500
@@ -58,4 +58,16 @@ config EFI_PCDP
 
 	  See <http://www.dig64.org/specifications/DIG64_HCDPv20_042804.pdf>
 
+config DELL_RBU
+        tristate "BIOS update support for DELL systems via sysfs"
+        default n
+        help
+          Say Y if you want to have the option of updating the BIOS for your
+	  DELL system. Note you need a supporting application to comunicate 
+	  with the BIOS regardign the new image for the image update to 
+	  take effect.
+
+	  See <file:Documentation/DELL_RBU.txt> for more details on the driver.
+
+
 endmenu
diff -uprN linux-2.6.11.8.ORIG/drivers/firmware/Makefile linux-2.6.11.8/drivers/firmware/Makefile
--- linux-2.6.11.8.ORIG/drivers/firmware/Makefile	2005-05-13 12:08:12.000000000 -0500
+++ linux-2.6.11.8/drivers/firmware/Makefile	2005-05-09 15:15:16.000000000 -0500
@@ -4,3 +4,4 @@
 obj-$(CONFIG_EDD)             	+= edd.o
 obj-$(CONFIG_EFI_VARS)		+= efivars.o
 obj-$(CONFIG_EFI_PCDP)		+= pcdp.o
+obj-$(CONFIG_DELL_RBU)		+= dell_rbu.o
-
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