firmware: dell_rbu: Move dell_rbu to drivers/platform/x86

Move dell_rbu to the more appropriate directory drivers/platform/x86.

Signed-off-by: Stuart Hayes <stuart.w.hayes@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

3 files changed, 766 insertions, 0 deletions

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 1fca33c97e8a..097212c712f7 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -230,6 +230,18 @@ config DELL_RBTN
           To compile this driver as a module, choose M here: the module will
           be called dell-rbtn.
 
+config DELL_RBU
+        tristate "BIOS update support for DELL systems via sysfs"
+        depends on X86
+        select FW_LOADER
+        select FW_LOADER_USER_HELPER
+        help
+         Say m if you want to have the option of updating the BIOS for your
+         DELL system. Note you need a Dell OpenManage or Dell Update package (DUP)
+         supporting application to communicate with the BIOS regarding the new
+         image for the image update to take effect.
+         See <file:Documentation/dell_rbu.txt> for more details on the driver.
+
 
 config FUJITSU_LAPTOP
         tristate "Fujitsu Laptop Extras"
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index e6d1becf81ce..8843f8e22127 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_DELL_WMI_AIO)	+= dell-wmi-aio.o
 obj-$(CONFIG_DELL_WMI_LED)      += dell-wmi-led.o
 obj-$(CONFIG_DELL_SMO8800)      += dell-smo8800.o
 obj-$(CONFIG_DELL_RBTN)         += dell-rbtn.o
+obj-$(CONFIG_DELL_RBU)          += dell_rbu.o
 obj-$(CONFIG_ACER_WMI)          += acer-wmi.o
 obj-$(CONFIG_ACER_WIRELESS)     += acer-wireless.o
 obj-$(CONFIG_ACERHDF)           += acerhdf.o
diff --git a/drivers/platform/x86/dell_rbu.c b/drivers/platform/x86/dell_rbu.c
new file mode 100644
index 000000000000..ccefa84f7305
--- /dev/null
+++ b/drivers/platform/x86/dell_rbu.c
@@ -0,0 +1,753 @@
+/*
+ * 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. The driver supports two mechanism to update the BIOS namely
+ * contiguous and packetized. Both these methods still require having some
+ * application to set the CMOS bit indicating the BIOS to update itself
+ * after a reboot.
+ *
+ * Contiguous method:
+ * This driver writes the incoming data in a monolithic image by allocating
+ * contiguous physical pages large enough to accommodate the incoming BIOS
+ * image size.
+ *
+ * Packetized method:
+ * The driver writes the incoming packet image by allocating a new packet
+ * on every time the packet data is written. This driver requires an
+ * application to break the BIOS image in to fixed sized packet chunks.
+ *
+ * See Documentation/dell_rbu.txt for more info.
+ *
+ * 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/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/blkdev.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/moduleparam.h>
+#include <linux/firmware.h>
+#include <linux/dma-mapping.h>
+#include <asm/set_memory.h>
+
+MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>");
+MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("3.2");
+
+#define BIOS_SCAN_LIMIT 0xffffffff
+#define MAX_IMAGE_LENGTH 16
+static struct _rbu_data {
+        void *image_update_buffer;
+        unsigned long image_update_buffer_size;
+        unsigned long bios_image_size;
+        int image_update_ordernum;
+        int dma_alloc;
+        spinlock_t lock;
+        unsigned long packet_read_count;
+        unsigned long num_packets;
+        unsigned long packetsize;
+        unsigned long imagesize;
+        int entry_created;
+} rbu_data;
+
+static char image_type[MAX_IMAGE_LENGTH + 1] = "mono";
+module_param_string(image_type, image_type, sizeof (image_type), 0);
+MODULE_PARM_DESC(image_type,
+        "BIOS image type. choose- mono or packet or init");
+
+static unsigned long allocation_floor = 0x100000;
+module_param(allocation_floor, ulong, 0644);
+MODULE_PARM_DESC(allocation_floor,
+    "Minimum address for allocations when using Packet mode");
+
+struct packet_data {
+        struct list_head list;
+        size_t length;
+        void *data;
+        int ordernum;
+};
+
+static struct packet_data packet_data_head;
+
+static struct platform_device *rbu_device;
+static int context;
+static dma_addr_t dell_rbu_dmaaddr;
+
+static void init_packet_head(void)
+{
+        INIT_LIST_HEAD(&packet_data_head.list);
+        rbu_data.packet_read_count = 0;
+        rbu_data.num_packets = 0;
+        rbu_data.packetsize = 0;
+        rbu_data.imagesize = 0;
+}
+
+static int create_packet(void *data, size_t length)
+{
+        struct packet_data *newpacket;
+        int ordernum = 0;
+        int retval = 0;
+        unsigned int packet_array_size = 0;
+        void **invalid_addr_packet_array = NULL;
+        void *packet_data_temp_buf = NULL;
+        unsigned int idx = 0;
+
+        pr_debug("create_packet: entry \n");
+
+        if (!rbu_data.packetsize) {
+                pr_debug("create_packet: packetsize not specified\n");
+                retval = -EINVAL;
+                goto out_noalloc;
+        }
+
+        spin_unlock(&rbu_data.lock);
+
+        newpacket = kzalloc(sizeof (struct packet_data), GFP_KERNEL);
+
+        if (!newpacket) {
+                printk(KERN_WARNING
+                        "dell_rbu:%s: failed to allocate new "
+                        "packet\n", __func__);
+                retval = -ENOMEM;
+                spin_lock(&rbu_data.lock);
+                goto out_noalloc;
+        }
+
+        ordernum = get_order(length);
+
+        /*
+         * BIOS errata mean we cannot allocate packets below 1MB or they will
+         * be overwritten by BIOS.
+         *
+         * array to temporarily hold packets
+         * that are below the allocation floor
+         *
+         * NOTE: very simplistic because we only need the floor to be at 1MB
+         *       due to BIOS errata. This shouldn't be used for higher floors
+         *       or you will run out of mem trying to allocate the array.
+         */
+        packet_array_size = max(
+                        (unsigned int)(allocation_floor / rbu_data.packetsize),
+                        (unsigned int)1);
+        invalid_addr_packet_array = kcalloc(packet_array_size, sizeof(void *),
+                                                GFP_KERNEL);
+
+        if (!invalid_addr_packet_array) {
+                printk(KERN_WARNING
+                        "dell_rbu:%s: failed to allocate "
+                        "invalid_addr_packet_array \n",
+                        __func__);
+                retval = -ENOMEM;
+                spin_lock(&rbu_data.lock);
+                goto out_alloc_packet;
+        }
+
+        while (!packet_data_temp_buf) {
+                packet_data_temp_buf = (unsigned char *)
+                        __get_free_pages(GFP_KERNEL, ordernum);
+                if (!packet_data_temp_buf) {
+                        printk(KERN_WARNING
+                                "dell_rbu:%s: failed to allocate new "
+                                "packet\n", __func__);
+                        retval = -ENOMEM;
+                        spin_lock(&rbu_data.lock);
+                        goto out_alloc_packet_array;
+                }
+
+                if ((unsigned long)virt_to_phys(packet_data_temp_buf)
+                                < allocation_floor) {
+                        pr_debug("packet 0x%lx below floor at 0x%lx.\n",
+                                        (unsigned long)virt_to_phys(
+                                                packet_data_temp_buf),
+                                        allocation_floor);
+                        invalid_addr_packet_array[idx++] = packet_data_temp_buf;
+                        packet_data_temp_buf = NULL;
+                }
+        }
+        /*
+         * set to uncachable or it may never get written back before reboot
+         */
+        set_memory_uc((unsigned long)packet_data_temp_buf, 1 << ordernum);
+
+        spin_lock(&rbu_data.lock);
+
+        newpacket->data = packet_data_temp_buf;
+
+        pr_debug("create_packet: newpacket at physical addr %lx\n",
+                (unsigned long)virt_to_phys(newpacket->data));
+
+        /* packets may not have fixed size */
+        newpacket->length = length;
+        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);
+
+        memcpy(newpacket->data, data, length);
+
+        pr_debug("create_packet: exit \n");
+
+out_alloc_packet_array:
+        /* always free packet array */
+        for (;idx>0;idx--) {
+                pr_debug("freeing unused packet below floor 0x%lx.\n",
+                        (unsigned long)virt_to_phys(
+                                invalid_addr_packet_array[idx-1]));
+                free_pages((unsigned long)invalid_addr_packet_array[idx-1],
+                        ordernum);
+        }
+        kfree(invalid_addr_packet_array);
+
+out_alloc_packet:
+        /* if error, free data */
+        if (retval)
+                kfree(newpacket);
+
+out_noalloc:
+        return retval;
+}
+
+static int packetize_data(const u8 *data, size_t length)
+{
+        int rc = 0;
+        int done = 0;
+        int packet_length;
+        u8 *temp;
+        u8 *end = (u8 *) data + length;
+        pr_debug("packetize_data: data length %zd\n", length);
+        if (!rbu_data.packetsize) {
+                printk(KERN_WARNING
+                        "dell_rbu: packetsize not specified\n");
+                return -EIO;
+        }
+
+        temp = (u8 *) data;
+
+        /* packetize the hunk */
+        while (!done) {
+                if ((temp + rbu_data.packetsize) < end)
+                        packet_length = rbu_data.packetsize;
+                else {
+                        /* this is the last packet */
+                        packet_length = end - temp;
+                        done = 1;
+                }
+
+                if ((rc = create_packet(temp, packet_length)))
+                        return rc;
+
+                pr_debug("%p:%td\n", temp, (end - temp));
+                temp += packet_length;
+        }
+
+        rbu_data.imagesize = length;
+
+        return rc;
+}
+
+static 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 int packet_read_list(char *data, size_t * pread_length)
+{
+        struct list_head *ptemp_list;
+        int temp_count = 0;
+        int bytes_copied = 0;
+        int bytes_read = 0;
+        int remaining_bytes = 0;
+        char *pdest = data;
+
+        /* check if we have any packets */
+        if (0 == rbu_data.num_packets)
+                return -ENOMEM;
+
+        remaining_bytes = *pread_length;
+        bytes_read = rbu_data.packet_read_count;
+
+        ptemp_list = (&packet_data_head.list)->next;
+        while (!list_empty(ptemp_list)) {
+                bytes_copied = do_packet_read(pdest, ptemp_list,
+                        remaining_bytes, bytes_read, &temp_count);
+                remaining_bytes -= bytes_copied;
+                bytes_read += bytes_copied;
+                pdest += bytes_copied;
+                /*
+                 * check if we reached end of buffer before reaching the
+                 * last packet
+                 */
+                if (remaining_bytes == 0)
+                        break;
+
+                ptemp_list = ptemp_list->next;
+        }
+        /*finally set the bytes read */
+        *pread_length = bytes_read - rbu_data.packet_read_count;
+        rbu_data.packet_read_count = bytes_read;
+        return 0;
+}
+
+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);
+                set_memory_wb((unsigned long)newpacket->data,
+                        1 << newpacket->ordernum);
+                free_pages((unsigned long) newpacket->data,
+                        newpacket->ordernum);
+                kfree(newpacket);
+        }
+        rbu_data.packet_read_count = 0;
+        rbu_data.num_packets = 0;
+        rbu_data.imagesize = 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)
+                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);
+        if (rbu_data.dma_alloc == 1)
+                dma_free_coherent(NULL, rbu_data.bios_image_size,
+                        rbu_data.image_update_buffer, dell_rbu_dmaaddr);
+        else
+                free_pages((unsigned long) rbu_data.image_update_buffer,
+                        rbu_data.image_update_ordernum);
+
+        /*
+         * Re-initialize the rbu_data variables after a free
+         */
+        rbu_data.image_update_ordernum = -1;
+        rbu_data.image_update_buffer = NULL;
+        rbu_data.image_update_buffer_size = 0;
+        rbu_data.bios_image_size = 0;
+        rbu_data.dma_alloc = 0;
+}
+
+/*
+ * img_update_realloc: This function allocates the contiguous pages to
+ * accommodate 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
+ * accommodate 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 returns with lock held.
+ */
+static int img_update_realloc(unsigned long size)
+{
+        unsigned char *image_update_buffer = NULL;
+        unsigned long rc;
+        unsigned long img_buf_phys_addr;
+        int ordernum;
+        int dma_alloc = 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 "dell_rbu:%s: corruption "
+                                "check failed\n", __func__);
+                        return -EINVAL;
+                }
+                /*
+                 * we have a valid pre-allocated buffer with
+                 * sufficient size
+                 */
+                return 0;
+        }
+
+        /*
+         * free any previously allocated buffer
+         */
+        img_update_free();
+
+        spin_unlock(&rbu_data.lock);
+
+        ordernum = get_order(size);
+        image_update_buffer =
+                (unsigned char *) __get_free_pages(GFP_KERNEL, ordernum);
+
+        img_buf_phys_addr =
+                (unsigned long) virt_to_phys(image_update_buffer);
+
+        if (img_buf_phys_addr > BIOS_SCAN_LIMIT) {
+                free_pages((unsigned long) image_update_buffer, ordernum);
+                ordernum = -1;
+                image_update_buffer = dma_alloc_coherent(NULL, size,
+                        &dell_rbu_dmaaddr, GFP_KERNEL);
+                dma_alloc = 1;
+        }
+
+        spin_lock(&rbu_data.lock);
+
+        if (image_update_buffer != NULL) {
+                rbu_data.image_update_buffer = image_update_buffer;
+                rbu_data.image_update_buffer_size = size;
+                rbu_data.bios_image_size =
+                        rbu_data.image_update_buffer_size;
+                rbu_data.image_update_ordernum = ordernum;
+                rbu_data.dma_alloc = dma_alloc;
+                rc = 0;
+        } else {
+                pr_debug("Not enough memory for image update:"
+                        "size = %ld\n", size);
+                rc = -ENOMEM;
+        }
+
+        return rc;
+}
+
+static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count)
+{
+        int retval;
+        size_t bytes_left;
+        size_t data_length;
+        char *ptempBuf = buffer;
+
+        /* check to see if we have something to return */
+        if (rbu_data.num_packets == 0) {
+                pr_debug("read_packet_data: no packets written\n");
+                retval = -ENOMEM;
+                goto read_rbu_data_exit;
+        }
+
+        if (pos > rbu_data.imagesize) {
+                retval = 0;
+                printk(KERN_WARNING "dell_rbu:read_packet_data: "
+                        "data underrun\n");
+                goto read_rbu_data_exit;
+        }
+
+        bytes_left = rbu_data.imagesize - pos;
+        data_length = min(bytes_left, count);
+
+        if ((retval = packet_read_list(ptempBuf, &data_length)) < 0)
+                goto read_rbu_data_exit;
+
+        if ((pos + count) > rbu_data.imagesize) {
+                rbu_data.packet_read_count = 0;
+                /* this was the last copy */
+                retval = bytes_left;
+        } else
+                retval = count;
+
+      read_rbu_data_exit:
+        return retval;
+}
+
+static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count)
+{
+        /* check to see if we have something to return */
+        if ((rbu_data.image_update_buffer == NULL) ||
+                (rbu_data.bios_image_size == 0)) {
+                pr_debug("read_rbu_data_mono: image_update_buffer %p ,"
+                        "bios_image_size %lu\n",
+                        rbu_data.image_update_buffer,
+                        rbu_data.bios_image_size);
+                return -ENOMEM;
+        }
+
+        return memory_read_from_buffer(buffer, count, &pos,
+                        rbu_data.image_update_buffer, rbu_data.bios_image_size);
+}
+
+static ssize_t read_rbu_data(struct file *filp, struct kobject *kobj,
+                             struct bin_attribute *bin_attr,
+                             char *buffer, loff_t pos, size_t count)
+{
+        ssize_t ret_count = 0;
+
+        spin_lock(&rbu_data.lock);
+
+        if (!strcmp(image_type, "mono"))
+                ret_count = read_rbu_mono_data(buffer, pos, count);
+        else if (!strcmp(image_type, "packet"))
+                ret_count = read_packet_data(buffer, pos, count);
+        else
+                pr_debug("read_rbu_data: invalid image type specified\n");
+
+        spin_unlock(&rbu_data.lock);
+        return ret_count;
+}
+
+static void callbackfn_rbu(const struct firmware *fw, void *context)
+{
+        rbu_data.entry_created = 0;
+
+        if (!fw)
+                return;
+
+        if (!fw->size)
+                goto out;
+
+        spin_lock(&rbu_data.lock);
+        if (!strcmp(image_type, "mono")) {
+                if (!img_update_realloc(fw->size))
+                        memcpy(rbu_data.image_update_buffer,
+                                fw->data, fw->size);
+        } else if (!strcmp(image_type, "packet")) {
+                /*
+                 * we need to free previous packets if a
+                 * new hunk of packets needs to be downloaded
+                 */
+                packet_empty_list();
+                if (packetize_data(fw->data, fw->size))
+                        /* Incase something goes wrong when we are
+                         * in middle of packetizing the data, we
+                         * need to free up whatever packets might
+                         * have been created before we quit.
+                         */
+                        packet_empty_list();
+        } else
+                pr_debug("invalid image type specified.\n");
+        spin_unlock(&rbu_data.lock);
+ out:
+        release_firmware(fw);
+}
+
+static ssize_t read_rbu_image_type(struct file *filp, struct kobject *kobj,
+                                   struct bin_attribute *bin_attr,
+                                   char *buffer, loff_t pos, size_t count)
+{
+        int size = 0;
+        if (!pos)
+                size = scnprintf(buffer, count, "%s\n", image_type);
+        return size;
+}
+
+static ssize_t write_rbu_image_type(struct file *filp, struct kobject *kobj,
+                                    struct bin_attribute *bin_attr,
+                                    char *buffer, loff_t pos, size_t count)
+{
+        int rc = count;
+        int req_firm_rc = 0;
+        int i;
+        spin_lock(&rbu_data.lock);
+        /*
+         * Find the first newline or space
+         */
+        for (i = 0; i < count; ++i)
+                if (buffer[i] == '\n' || buffer[i] == ' ') {
+                        buffer[i] = '\0';
+                        break;
+                }
+        if (i == count)
+                buffer[count] = '\0';
+
+        if (strstr(buffer, "mono"))
+                strcpy(image_type, "mono");
+        else if (strstr(buffer, "packet"))
+                strcpy(image_type, "packet");
+        else if (strstr(buffer, "init")) {
+                /*
+                 * If due to the user error the driver gets in a bad
+                 * state where even though it is loaded , the
+                 * /sys/class/firmware/dell_rbu entries are missing.
+                 * to cover this situation the user can recreate entries
+                 * by writing init to image_type.
+                 */
+                if (!rbu_data.entry_created) {
+                        spin_unlock(&rbu_data.lock);
+                        req_firm_rc = request_firmware_nowait(THIS_MODULE,
+                                FW_ACTION_NOHOTPLUG, "dell_rbu",
+                                &rbu_device->dev, GFP_KERNEL, &context,
+                                callbackfn_rbu);
+                        if (req_firm_rc) {
+                                printk(KERN_ERR
+                                        "dell_rbu:%s request_firmware_nowait"
+                                        " failed %d\n", __func__, rc);
+                                rc = -EIO;
+                        } else
+                                rbu_data.entry_created = 1;
+
+                        spin_lock(&rbu_data.lock);
+                }
+        } else {
+                printk(KERN_WARNING "dell_rbu: image_type is invalid\n");
+                spin_unlock(&rbu_data.lock);
+                return -EINVAL;
+        }
+
+        /* we must free all previous allocations */
+        packet_empty_list();
+        img_update_free();
+        spin_unlock(&rbu_data.lock);
+
+        return rc;
+}
+
+static ssize_t read_rbu_packet_size(struct file *filp, struct kobject *kobj,
+                                    struct bin_attribute *bin_attr,
+                                    char *buffer, loff_t pos, size_t count)
+{
+        int size = 0;
+        if (!pos) {
+                spin_lock(&rbu_data.lock);
+                size = scnprintf(buffer, count, "%lu\n", rbu_data.packetsize);
+                spin_unlock(&rbu_data.lock);
+        }
+        return size;
+}
+
+static ssize_t write_rbu_packet_size(struct file *filp, struct kobject *kobj,
+                                     struct bin_attribute *bin_attr,
+                                     char *buffer, loff_t pos, size_t count)
+{
+        unsigned long temp;
+        spin_lock(&rbu_data.lock);
+        packet_empty_list();
+        sscanf(buffer, "%lu", &temp);
+        if (temp < 0xffffffff)
+                rbu_data.packetsize = temp;
+
+        spin_unlock(&rbu_data.lock);
+        return count;
+}
+
+static struct bin_attribute rbu_data_attr = {
+        .attr = {.name = "data", .mode = 0444},
+        .read = read_rbu_data,
+};
+
+static struct bin_attribute rbu_image_type_attr = {
+        .attr = {.name = "image_type", .mode = 0644},
+        .read = read_rbu_image_type,
+        .write = write_rbu_image_type,
+};
+
+static struct bin_attribute rbu_packet_size_attr = {
+        .attr = {.name = "packet_size", .mode = 0644},
+        .read = read_rbu_packet_size,
+        .write = write_rbu_packet_size,
+};
+
+static int __init dcdrbu_init(void)
+{
+        int rc;
+        spin_lock_init(&rbu_data.lock);
+
+        init_packet_head();
+        rbu_device = platform_device_register_simple("dell_rbu", -1, NULL, 0);
+        if (IS_ERR(rbu_device)) {
+                printk(KERN_ERR
+                        "dell_rbu:%s:platform_device_register_simple "
+                        "failed\n", __func__);
+                return PTR_ERR(rbu_device);
+        }
+
+        rc = sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_data_attr);
+        if (rc)
+                goto out_devreg;
+        rc = sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr);
+        if (rc)
+                goto out_data;
+        rc = sysfs_create_bin_file(&rbu_device->dev.kobj,
+                &rbu_packet_size_attr);
+        if (rc)
+                goto out_imtype;
+
+        rbu_data.entry_created = 0;
+        return 0;
+
+out_imtype:
+        sysfs_remove_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr);
+out_data:
+        sysfs_remove_bin_file(&rbu_device->dev.kobj, &rbu_data_attr);
+out_devreg:
+        platform_device_unregister(rbu_device);
+        return rc;
+}
+
+static __exit void dcdrbu_exit(void)
+{
+        spin_lock(&rbu_data.lock);
+        packet_empty_list();
+        img_update_free();
+        spin_unlock(&rbu_data.lock);
+        platform_device_unregister(rbu_device);
+}
+
+module_exit(dcdrbu_exit);
+module_init(dcdrbu_init);
+
+/* vim:noet:ts=8:sw=8
+*/