Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1024 insertions, 0 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
new file mode 100644
index 000000000000..fdf143b405be
--- /dev/null
+++ b/drivers/acpi/ec.c
@@ -0,0 +1,1024 @@
+/*
+ *  acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $)
+ *
+ *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or (at
+ *  your option) any later version.
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <asm/io.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include <acpi/actypes.h>
+
+#define _COMPONENT              ACPI_EC_COMPONENT
+ACPI_MODULE_NAME                ("acpi_ec")
+
+#define ACPI_EC_COMPONENT               0x00100000
+#define ACPI_EC_CLASS                   "embedded_controller"
+#define ACPI_EC_HID                     "PNP0C09"
+#define ACPI_EC_DRIVER_NAME             "ACPI Embedded Controller Driver"
+#define ACPI_EC_DEVICE_NAME             "Embedded Controller"
+#define ACPI_EC_FILE_INFO               "info"
+
+
+#define ACPI_EC_FLAG_OBF        0x01    /* Output buffer full */
+#define ACPI_EC_FLAG_IBF        0x02    /* Input buffer full */
+#define ACPI_EC_FLAG_SCI        0x20    /* EC-SCI occurred */
+
+#define ACPI_EC_EVENT_OBF       0x01    /* Output buffer full */
+#define ACPI_EC_EVENT_IBE       0x02    /* Input buffer empty */
+
+#define ACPI_EC_UDELAY          100     /* Poll @ 100us increments */
+#define ACPI_EC_UDELAY_COUNT    1000    /* Wait 10ms max. during EC ops */
+#define ACPI_EC_UDELAY_GLK      1000    /* Wait 1ms max. to get global lock */
+
+#define ACPI_EC_COMMAND_READ    0x80
+#define ACPI_EC_COMMAND_WRITE   0x81
+#define ACPI_EC_COMMAND_QUERY   0x84
+
+static int acpi_ec_add (struct acpi_device *device);
+static int acpi_ec_remove (struct acpi_device *device, int type);
+static int acpi_ec_start (struct acpi_device *device);
+static int acpi_ec_stop (struct acpi_device *device, int type);
+
+static struct acpi_driver acpi_ec_driver = {
+        .name =         ACPI_EC_DRIVER_NAME,
+        .class =        ACPI_EC_CLASS,
+        .ids =          ACPI_EC_HID,
+        .ops =          {
+                                .add =          acpi_ec_add,
+                                .remove =       acpi_ec_remove,
+                                .start =        acpi_ec_start,
+                                .stop =         acpi_ec_stop,
+                        },
+};
+
+struct acpi_ec {
+        acpi_handle                     handle;
+        unsigned long                   uid;
+        unsigned long                   gpe_bit;
+        struct acpi_generic_address     status_addr;
+        struct acpi_generic_address     command_addr;
+        struct acpi_generic_address     data_addr;
+        unsigned long                   global_lock;
+        spinlock_t                      lock;
+};
+
+/* If we find an EC via the ECDT, we need to keep a ptr to its context */
+static struct acpi_ec   *ec_ecdt;
+
+/* External interfaces use first EC only, so remember */
+static struct acpi_device *first_ec;
+
+/* --------------------------------------------------------------------------
+                             Transaction Management
+   -------------------------------------------------------------------------- */
+
+static int
+acpi_ec_wait (
+        struct acpi_ec          *ec,
+        u8                      event)
+{
+        u32                     acpi_ec_status = 0;
+        u32                     i = ACPI_EC_UDELAY_COUNT;
+
+        if (!ec)
+                return -EINVAL;
+
+        /* Poll the EC status register waiting for the event to occur. */
+        switch (event) {
+        case ACPI_EC_EVENT_OBF:
+                do {
+                        acpi_hw_low_level_read(8, &acpi_ec_status, &ec->status_addr);
+                        if (acpi_ec_status & ACPI_EC_FLAG_OBF)
+                                return 0;
+                        udelay(ACPI_EC_UDELAY);
+                } while (--i>0);
+                break;
+        case ACPI_EC_EVENT_IBE:
+                do {
+                        acpi_hw_low_level_read(8, &acpi_ec_status, &ec->status_addr);
+                        if (!(acpi_ec_status & ACPI_EC_FLAG_IBF))
+                                return 0;
+                        udelay(ACPI_EC_UDELAY);
+                } while (--i>0);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return -ETIME;
+}
+
+
+static int
+acpi_ec_read (
+        struct acpi_ec          *ec,
+        u8                      address,
+        u32                     *data)
+{
+        acpi_status             status = AE_OK;
+        int                     result = 0;
+        unsigned long           flags = 0;
+        u32                     glk = 0;
+
+        ACPI_FUNCTION_TRACE("acpi_ec_read");
+
+        if (!ec || !data)
+                return_VALUE(-EINVAL);
+
+        *data = 0;
+
+        if (ec->global_lock) {
+                status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
+                if (ACPI_FAILURE(status))
+                        return_VALUE(-ENODEV);
+        }
+        
+        spin_lock_irqsave(&ec->lock, flags);
+
+        acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->command_addr);
+        result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
+        if (result)
+                goto end;
+
+        acpi_hw_low_level_write(8, address, &ec->data_addr);
+        result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
+        if (result)
+                goto end;
+
+
+        acpi_hw_low_level_read(8, data, &ec->data_addr);
+
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
+                *data, address));
+
+end:
+        spin_unlock_irqrestore(&ec->lock, flags);
+
+        if (ec->global_lock)
+                acpi_release_global_lock(glk);
+
+        return_VALUE(result);
+}
+
+
+static int
+acpi_ec_write (
+        struct acpi_ec          *ec,
+        u8                      address,
+        u8                      data)
+{
+        int                     result = 0;
+        acpi_status             status = AE_OK;
+        unsigned long           flags = 0;
+        u32                     glk = 0;
+
+        ACPI_FUNCTION_TRACE("acpi_ec_write");
+
+        if (!ec)
+                return_VALUE(-EINVAL);
+
+        if (ec->global_lock) {
+                status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
+                if (ACPI_FAILURE(status))
+                        return_VALUE(-ENODEV);
+        }
+
+        spin_lock_irqsave(&ec->lock, flags);
+
+        acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->command_addr);
+        result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
+        if (result)
+                goto end;
+
+        acpi_hw_low_level_write(8, address, &ec->data_addr);
+        result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
+        if (result)
+                goto end;
+
+        acpi_hw_low_level_write(8, data, &ec->data_addr);
+        result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
+        if (result)
+                goto end;
+
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
+                data, address));
+
+end:
+        spin_unlock_irqrestore(&ec->lock, flags);
+
+        if (ec->global_lock)
+                acpi_release_global_lock(glk);
+
+        return_VALUE(result);
+}
+
+/*
+ * Externally callable EC access functions. For now, assume 1 EC only
+ */
+int
+ec_read(u8 addr, u8 *val)
+{
+        struct acpi_ec *ec;
+        int err;
+        u32 temp_data;
+
+        if (!first_ec)
+                return -ENODEV;
+
+        ec = acpi_driver_data(first_ec);
+
+        err = acpi_ec_read(ec, addr, &temp_data);
+
+        if (!err) {
+                *val = temp_data;
+                return 0;
+        }
+        else
+                return err;
+}
+EXPORT_SYMBOL(ec_read);
+
+int
+ec_write(u8 addr, u8 val)
+{
+        struct acpi_ec *ec;
+        int err;
+
+        if (!first_ec)
+                return -ENODEV;
+
+        ec = acpi_driver_data(first_ec);
+
+        err = acpi_ec_write(ec, addr, val);
+
+        return err;
+}
+EXPORT_SYMBOL(ec_write);
+
+
+static int
+acpi_ec_query (
+        struct acpi_ec          *ec,
+        u32                     *data)
+{
+        int                     result = 0;
+        acpi_status             status = AE_OK;
+        unsigned long           flags = 0;
+        u32                     glk = 0;
+
+        ACPI_FUNCTION_TRACE("acpi_ec_query");
+
+        if (!ec || !data)
+                return_VALUE(-EINVAL);
+
+        *data = 0;
+
+        if (ec->global_lock) {
+                status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
+                if (ACPI_FAILURE(status))
+                        return_VALUE(-ENODEV);
+        }
+
+        /*
+         * Query the EC to find out which _Qxx method we need to evaluate.
+         * Note that successful completion of the query causes the ACPI_EC_SCI
+         * bit to be cleared (and thus clearing the interrupt source).
+         */
+        spin_lock_irqsave(&ec->lock, flags);
+
+        acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->command_addr);
+        result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
+        if (result)
+                goto end;
+        
+        acpi_hw_low_level_read(8, data, &ec->data_addr);
+        if (!*data)
+                result = -ENODATA;
+
+end:
+        spin_unlock_irqrestore(&ec->lock, flags);
+
+        if (ec->global_lock)
+                acpi_release_global_lock(glk);
+
+        return_VALUE(result);
+}
+
+
+/* --------------------------------------------------------------------------
+                                Event Management
+   -------------------------------------------------------------------------- */
+
+struct acpi_ec_query_data {
+        acpi_handle             handle;
+        u8                      data;
+};
+
+static void
+acpi_ec_gpe_query (
+        void                    *ec_cxt)
+{
+        struct acpi_ec          *ec = (struct acpi_ec *) ec_cxt;
+        u32                     value = 0;
+        unsigned long           flags = 0;
+        static char             object_name[5] = {'_','Q','0','0','\0'};
+        const char              hex[] = {'0','1','2','3','4','5','6','7',
+                                         '8','9','A','B','C','D','E','F'};
+
+        ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
+
+        if (!ec_cxt)
+                goto end;       
+
+        spin_lock_irqsave(&ec->lock, flags);
+        acpi_hw_low_level_read(8, &value, &ec->command_addr);
+        spin_unlock_irqrestore(&ec->lock, flags);
+
+        /* TBD: Implement asynch events!
+         * NOTE: All we care about are EC-SCI's.  Other EC events are
+         * handled via polling (yuck!).  This is because some systems
+         * treat EC-SCIs as level (versus EDGE!) triggered, preventing
+         *  a purely interrupt-driven approach (grumble, grumble).
+         */
+        if (!(value & ACPI_EC_FLAG_SCI))
+                goto end;
+
+        if (acpi_ec_query(ec, &value))
+                goto end;
+        
+        object_name[2] = hex[((value >> 4) & 0x0F)];
+        object_name[3] = hex[(value & 0x0F)];
+
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
+
+        acpi_evaluate_object(ec->handle, object_name, NULL, NULL);
+
+end:
+        acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
+}
+
+static u32
+acpi_ec_gpe_handler (
+        void                    *data)
+{
+        acpi_status             status = AE_OK;
+        struct acpi_ec          *ec = (struct acpi_ec *) data;
+
+        if (!ec)
+                return ACPI_INTERRUPT_NOT_HANDLED;
+
+        acpi_disable_gpe(NULL, ec->gpe_bit, ACPI_ISR);
+
+        status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
+                acpi_ec_gpe_query, ec);
+
+        if (status == AE_OK)
+                return ACPI_INTERRUPT_HANDLED;
+        else
+                return ACPI_INTERRUPT_NOT_HANDLED;
+}
+
+/* --------------------------------------------------------------------------
+                             Address Space Management
+   -------------------------------------------------------------------------- */
+
+static acpi_status
+acpi_ec_space_setup (
+        acpi_handle             region_handle,
+        u32                     function,
+        void                    *handler_context,
+        void                    **return_context)
+{
+        /*
+         * The EC object is in the handler context and is needed
+         * when calling the acpi_ec_space_handler.
+         */
+        if(function == ACPI_REGION_DEACTIVATE) 
+                *return_context = NULL;
+        else 
+                *return_context = handler_context;
+
+        return AE_OK;
+}
+
+
+static acpi_status
+acpi_ec_space_handler (
+        u32                     function,
+        acpi_physical_address   address,
+        u32                     bit_width,
+        acpi_integer            *value,
+        void                    *handler_context,
+        void                    *region_context)
+{
+        int                     result = 0;
+        struct acpi_ec          *ec = NULL;
+        u32                     temp = 0;
+        acpi_integer            f_v = 0;
+        int                     i = 0;
+
+        ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
+
+        if ((address > 0xFF) || !value || !handler_context)
+                return_VALUE(AE_BAD_PARAMETER);
+
+        if(bit_width != 8) {
+                printk(KERN_WARNING PREFIX "acpi_ec_space_handler: bit_width should be 8\n");
+                if (acpi_strict)
+                        return_VALUE(AE_BAD_PARAMETER);
+        }
+
+        ec = (struct acpi_ec *) handler_context;
+
+next_byte:
+        switch (function) {
+        case ACPI_READ:
+                result = acpi_ec_read(ec, (u8) address, &temp);
+                *value = (acpi_integer) temp;
+                break;
+        case ACPI_WRITE:
+                result = acpi_ec_write(ec, (u8) address, (u8) *value);
+                break;
+        default:
+                result = -EINVAL;
+                goto out;
+                break;
+        }
+
+        bit_width -= 8;
+        if(bit_width){
+
+                if(function == ACPI_READ)
+                        f_v |= (acpi_integer) (*value) << 8*i;
+                if(function == ACPI_WRITE)
+                        (*value) >>=8; 
+                i++;
+                goto next_byte;
+        }
+
+
+        if(function == ACPI_READ){
+                f_v |= (acpi_integer) (*value) << 8*i;
+                *value = f_v;
+        }
+
+                
+out:
+        switch (result) {
+        case -EINVAL:
+                return_VALUE(AE_BAD_PARAMETER);
+                break;
+        case -ENODEV:
+                return_VALUE(AE_NOT_FOUND);
+                break;
+        case -ETIME:
+                return_VALUE(AE_TIME);
+                break;
+        default:
+                return_VALUE(AE_OK);
+        }
+        
+
+}
+
+
+/* --------------------------------------------------------------------------
+                              FS Interface (/proc)
+   -------------------------------------------------------------------------- */
+
+static struct proc_dir_entry    *acpi_ec_dir;
+
+
+static int
+acpi_ec_read_info (struct seq_file *seq, void *offset)
+{
+        struct acpi_ec          *ec = (struct acpi_ec *) seq->private;
+
+        ACPI_FUNCTION_TRACE("acpi_ec_read_info");
+
+        if (!ec)
+                goto end;
+
+        seq_printf(seq, "gpe bit:                 0x%02x\n",
+                (u32) ec->gpe_bit);
+        seq_printf(seq, "ports:                   0x%02x, 0x%02x\n",
+                (u32) ec->status_addr.address, (u32) ec->data_addr.address);
+        seq_printf(seq, "use global lock:         %s\n",
+                ec->global_lock?"yes":"no");
+
+end:
+        return_VALUE(0);
+}
+
+static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
+{
+        return single_open(file, acpi_ec_read_info, PDE(inode)->data);
+}
+
+static struct file_operations acpi_ec_info_ops = {
+        .open           = acpi_ec_info_open_fs,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+        .owner = THIS_MODULE,
+};
+
+static int
+acpi_ec_add_fs (
+        struct acpi_device      *device)
+{
+        struct proc_dir_entry   *entry = NULL;
+
+        ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
+
+        if (!acpi_device_dir(device)) {
+                acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
+                        acpi_ec_dir);
+                if (!acpi_device_dir(device))
+                        return_VALUE(-ENODEV);
+        }
+
+        entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
+                acpi_device_dir(device));
+        if (!entry)
+                ACPI_DEBUG_PRINT((ACPI_DB_WARN,
+                        "Unable to create '%s' fs entry\n",
+                        ACPI_EC_FILE_INFO));
+        else {
+                entry->proc_fops = &acpi_ec_info_ops;
+                entry->data = acpi_driver_data(device);
+                entry->owner = THIS_MODULE;
+        }
+
+        return_VALUE(0);
+}
+
+
+static int
+acpi_ec_remove_fs (
+        struct acpi_device      *device)
+{
+        ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
+
+        if (acpi_device_dir(device)) {
+                remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
+                remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
+                acpi_device_dir(device) = NULL;
+        }
+
+        return_VALUE(0);
+}
+
+
+/* --------------------------------------------------------------------------
+                               Driver Interface
+   -------------------------------------------------------------------------- */
+
+static int
+acpi_ec_add (
+        struct acpi_device      *device)
+{
+        int                     result = 0;
+        acpi_status             status = AE_OK;
+        struct acpi_ec          *ec = NULL;
+        unsigned long           uid;
+
+        ACPI_FUNCTION_TRACE("acpi_ec_add");
+
+        if (!device)
+                return_VALUE(-EINVAL);
+
+        ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
+        if (!ec)
+                return_VALUE(-ENOMEM);
+        memset(ec, 0, sizeof(struct acpi_ec));
+
+        ec->handle = device->handle;
+        ec->uid = -1;
+        spin_lock_init(&ec->lock);
+        strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
+        strcpy(acpi_device_class(device), ACPI_EC_CLASS);
+        acpi_driver_data(device) = ec;
+
+        /* Use the global lock for all EC transactions? */
+        acpi_evaluate_integer(ec->handle, "_GLK", NULL, &ec->global_lock);
+
+        /* If our UID matches the UID for the ECDT-enumerated EC,
+           we now have the *real* EC info, so kill the makeshift one.*/
+        acpi_evaluate_integer(ec->handle, "_UID", NULL, &uid);
+        if (ec_ecdt && ec_ecdt->uid == uid) {
+                acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
+                        ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
+        
+                acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, &acpi_ec_gpe_handler);
+
+                kfree(ec_ecdt);
+        }
+
+        /* Get GPE bit assignment (EC events). */
+        /* TODO: Add support for _GPE returning a package */
+        status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe_bit);
+        if (ACPI_FAILURE(status)) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                        "Error obtaining GPE bit assignment\n"));
+                result = -ENODEV;
+                goto end;
+        }
+
+        result = acpi_ec_add_fs(device);
+        if (result)
+                goto end;
+
+        printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
+                acpi_device_name(device), acpi_device_bid(device),
+                (u32) ec->gpe_bit);
+
+        if (!first_ec)
+                first_ec = device;
+
+end:
+        if (result)
+                kfree(ec);
+
+        return_VALUE(result);
+}
+
+
+static int
+acpi_ec_remove (
+        struct acpi_device      *device,
+        int                     type)
+{
+        struct acpi_ec          *ec = NULL;
+
+        ACPI_FUNCTION_TRACE("acpi_ec_remove");
+
+        if (!device)
+                return_VALUE(-EINVAL);
+
+        ec = acpi_driver_data(device);
+
+        acpi_ec_remove_fs(device);
+
+        kfree(ec);
+
+        return_VALUE(0);
+}
+
+
+static acpi_status
+acpi_ec_io_ports (
+        struct acpi_resource    *resource,
+        void                    *context)
+{
+        struct acpi_ec          *ec = (struct acpi_ec *) context;
+        struct acpi_generic_address *addr;
+
+        if (resource->id != ACPI_RSTYPE_IO) {
+                return AE_OK;
+        }
+
+        /*
+         * The first address region returned is the data port, and
+         * the second address region returned is the status/command
+         * port.
+         */
+        if (ec->data_addr.register_bit_width == 0) {
+                addr = &ec->data_addr;
+        } else if (ec->command_addr.register_bit_width == 0) {
+                addr = &ec->command_addr;
+        } else {
+                return AE_CTRL_TERMINATE;
+        }
+
+        addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
+        addr->register_bit_width = 8;
+        addr->register_bit_offset = 0;
+        addr->address = resource->data.io.min_base_address;
+
+        return AE_OK;
+}
+
+
+static int
+acpi_ec_start (
+        struct acpi_device      *device)
+{
+        acpi_status             status = AE_OK;
+        struct acpi_ec          *ec = NULL;
+
+        ACPI_FUNCTION_TRACE("acpi_ec_start");
+
+        if (!device)
+                return_VALUE(-EINVAL);
+
+        ec = acpi_driver_data(device);
+
+        if (!ec)
+                return_VALUE(-EINVAL);
+
+        /*
+         * Get I/O port addresses. Convert to GAS format.
+         */
+        status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS,
+                acpi_ec_io_ports, ec);
+        if (ACPI_FAILURE(status) || ec->command_addr.register_bit_width == 0) {
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error getting I/O port addresses"));
+                return_VALUE(-ENODEV);
+        }
+
+        ec->status_addr = ec->command_addr;
+
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
+                (u32) ec->gpe_bit, (u32) ec->command_addr.address,
+                (u32) ec->data_addr.address));
+
+        /*
+         * Install GPE handler
+         */
+        status = acpi_install_gpe_handler(NULL, ec->gpe_bit,
+                ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec);
+        if (ACPI_FAILURE(status)) {
+                return_VALUE(-ENODEV);
+        }
+        acpi_set_gpe_type (NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME);
+        acpi_enable_gpe (NULL, ec->gpe_bit, ACPI_NOT_ISR);
+
+        status = acpi_install_address_space_handler (ec->handle,
+                        ACPI_ADR_SPACE_EC, &acpi_ec_space_handler,
+                        &acpi_ec_space_setup, ec);
+        if (ACPI_FAILURE(status)) {
+                acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler);
+                return_VALUE(-ENODEV);
+        }
+
+        return_VALUE(AE_OK);
+}
+
+
+static int
+acpi_ec_stop (
+        struct acpi_device      *device,
+        int                     type)
+{
+        acpi_status             status = AE_OK;
+        struct acpi_ec          *ec = NULL;
+
+        ACPI_FUNCTION_TRACE("acpi_ec_stop");
+
+        if (!device)
+                return_VALUE(-EINVAL);
+
+        ec = acpi_driver_data(device);
+
+        status = acpi_remove_address_space_handler(ec->handle,
+                ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
+        if (ACPI_FAILURE(status))
+                return_VALUE(-ENODEV);
+
+        status = acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler);
+        if (ACPI_FAILURE(status))
+                return_VALUE(-ENODEV);
+
+        return_VALUE(0);
+}
+
+static acpi_status __init
+acpi_fake_ecdt_callback (
+        acpi_handle     handle,
+        u32             Level,
+        void            *context,
+        void            **retval)
+{
+        acpi_status     status;
+
+        status = acpi_walk_resources(handle, METHOD_NAME__CRS,
+                acpi_ec_io_ports, ec_ecdt);
+        if (ACPI_FAILURE(status))
+                return status;
+        ec_ecdt->status_addr = ec_ecdt->command_addr;
+
+        ec_ecdt->uid = -1;
+        acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid);
+
+        status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe_bit);
+        if (ACPI_FAILURE(status))
+                return status;
+        spin_lock_init(&ec_ecdt->lock);
+        ec_ecdt->global_lock = TRUE;
+        ec_ecdt->handle = handle;
+
+        printk(KERN_INFO PREFIX  "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
+                (u32) ec_ecdt->gpe_bit, (u32) ec_ecdt->command_addr.address,
+                (u32) ec_ecdt->data_addr.address);
+
+        return AE_CTRL_TERMINATE;
+}
+
+/*
+ * Some BIOS (such as some from Gateway laptops) access EC region very early
+ * such as in BAT0._INI or EC._INI before an EC device is found and
+ * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
+ * required, but if EC regison is accessed early, it is required.
+ * The routine tries to workaround the BIOS bug by pre-scan EC device
+ * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
+ * op region (since _REG isn't invoked yet). The assumption is true for
+ * all systems found.
+ */
+static int __init
+acpi_ec_fake_ecdt(void)
+{
+        acpi_status     status;
+        int             ret = 0;
+
+        printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
+
+        ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
+        if (!ec_ecdt) {
+                ret = -ENOMEM;
+                goto error;
+        }
+        memset(ec_ecdt, 0, sizeof(struct acpi_ec));
+
+        status = acpi_get_devices (ACPI_EC_HID,
+                                acpi_fake_ecdt_callback,
+                                NULL,
+                                NULL);
+        if (ACPI_FAILURE(status)) {
+                kfree(ec_ecdt);
+                ec_ecdt = NULL;
+                ret = -ENODEV;
+                goto error;
+        }
+        return 0;
+error:
+        printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
+        return ret;
+}
+
+static int __init
+acpi_ec_get_real_ecdt(void)
+{
+        acpi_status             status;
+        struct acpi_table_ecdt  *ecdt_ptr;
+
+        status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, 
+                (struct acpi_table_header **) &ecdt_ptr);
+        if (ACPI_FAILURE(status))
+                return -ENODEV;
+
+        printk(KERN_INFO PREFIX "Found ECDT\n");
+
+        /*
+         * Generate a temporary ec context to use until the namespace is scanned
+         */
+        ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
+        if (!ec_ecdt)
+                return -ENOMEM;
+        memset(ec_ecdt, 0, sizeof(struct acpi_ec));
+
+        ec_ecdt->command_addr = ecdt_ptr->ec_control;
+        ec_ecdt->status_addr = ecdt_ptr->ec_control;
+        ec_ecdt->data_addr = ecdt_ptr->ec_data;
+        ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit;
+        spin_lock_init(&ec_ecdt->lock);
+        /* use the GL just to be safe */
+        ec_ecdt->global_lock = TRUE;
+        ec_ecdt->uid = ecdt_ptr->uid;
+
+        status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle);
+        if (ACPI_FAILURE(status)) {
+                goto error;
+        }
+
+        return 0;
+error:
+        printk(KERN_ERR PREFIX "Could not use ECDT\n");
+        kfree(ec_ecdt);
+        ec_ecdt = NULL;
+
+        return -ENODEV;
+}
+
+static int __initdata acpi_fake_ecdt_enabled;
+int __init
+acpi_ec_ecdt_probe (void)
+{
+        acpi_status             status;
+        int                     ret;
+
+        ret = acpi_ec_get_real_ecdt();
+        /* Try to make a fake ECDT */
+        if (ret && acpi_fake_ecdt_enabled) {
+                ret = acpi_ec_fake_ecdt();
+        }
+
+        if (ret)
+                return 0;
+
+        /*
+         * Install GPE handler
+         */
+        status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit,
+                ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler,
+                ec_ecdt);
+        if (ACPI_FAILURE(status)) {
+                goto error;
+        }
+        acpi_set_gpe_type (NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME);
+        acpi_enable_gpe (NULL, ec_ecdt->gpe_bit, ACPI_NOT_ISR);
+
+        status = acpi_install_address_space_handler (ACPI_ROOT_OBJECT,
+                        ACPI_ADR_SPACE_EC, &acpi_ec_space_handler,
+                        &acpi_ec_space_setup, ec_ecdt);
+        if (ACPI_FAILURE(status)) {
+                acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit,
+                        &acpi_ec_gpe_handler);
+                goto error;
+        }
+
+        return 0;
+
+error:
+        printk(KERN_ERR PREFIX "Could not use ECDT\n");
+        kfree(ec_ecdt);
+        ec_ecdt = NULL;
+
+        return -ENODEV;
+}
+
+
+static int __init acpi_ec_init (void)
+{
+        int                     result = 0;
+
+        ACPI_FUNCTION_TRACE("acpi_ec_init");
+
+        if (acpi_disabled)
+                return_VALUE(0);
+
+        acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
+        if (!acpi_ec_dir)
+                return_VALUE(-ENODEV);
+
+        /* Now register the driver for the EC */
+        result = acpi_bus_register_driver(&acpi_ec_driver);
+        if (result < 0) {
+                remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
+                return_VALUE(-ENODEV);
+        }
+
+        return_VALUE(result);
+}
+
+subsys_initcall(acpi_ec_init);
+
+/* EC driver currently not unloadable */
+#if 0
+static void __exit
+acpi_ec_exit (void)
+{
+        ACPI_FUNCTION_TRACE("acpi_ec_exit");
+
+        acpi_bus_unregister_driver(&acpi_ec_driver);
+
+        remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
+
+        return_VOID;
+}
+#endif /* 0 */
+
+static int __init acpi_fake_ecdt_setup(char *str)
+{
+        acpi_fake_ecdt_enabled = 1;
+        return 0;
+}
+__setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);