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

Abhay Salunke
2005-06-02T18:42:42Z

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@dell.com>

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@dell.com>
+ *
+ * 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@dell.com>");
+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