1 files changed, 177 insertions, 318 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index a802962ff2b4..e08cf98f504f 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1,6 +1,8 @@
 /*
- *  acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $)
+ *  ec.c - ACPI Embedded Controller Driver (v2.0)
  *
+ *  Copyright (C) 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
+ *  Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com>
  *  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>
@@ -91,9 +93,9 @@ static struct acpi_driver acpi_ec_driver = {
 };
 
 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
+/* External interfaces use first EC only, so remember */
 static struct acpi_ec {
         acpi_handle handle;
-        unsigned long uid;
         unsigned long gpe;
         unsigned long command_addr;
         unsigned long data_addr;
@@ -101,12 +103,8 @@ static struct acpi_ec {
         struct mutex lock;
         atomic_t query_pending;
         atomic_t event_count;
-        atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */
         wait_queue_head_t wait;
-} *ec_ecdt;
-
-/* External interfaces use first EC only, so remember */
-static struct acpi_device *first_ec;
+} *boot_ec, *first_ec;
 
 /* --------------------------------------------------------------------------
                              Transaction Management
@@ -173,56 +171,6 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, unsigned count)
         return -ETIME;
 }
 
-#ifdef ACPI_FUTURE_USAGE
-/*
- * Note: samsung nv5000 doesn't work with ec burst mode.
- * http://bugzilla.kernel.org/show_bug.cgi?id=4980
- */
-int acpi_ec_enter_burst_mode(struct acpi_ec *ec)
-{
-        u8 tmp = 0;
-        u8 status = 0;
-
-        status = acpi_ec_read_status(ec);
-        if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
-                status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
-                if (status)
-                        goto end;
-                acpi_ec_write_cmd(ec, ACPI_EC_BURST_ENABLE);
-                status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1);
-                tmp = acpi_ec_read_data(ec);
-                if (tmp != 0x90) {      /* Burst ACK byte */
-                        return -EINVAL;
-                }
-        }
-
-        atomic_set(&ec->leaving_burst, 0);
-        return 0;
-      end:
-        ACPI_EXCEPTION((AE_INFO, status, "EC wait, burst mode"));
-        return -1;
-}
-
-int acpi_ec_leave_burst_mode(struct acpi_ec *ec)
-{
-        u8 status = 0;
-
-        status = acpi_ec_read_status(ec);
-        if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)) {
-                status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
-                if (status)
-                        goto end;
-                acpi_ec_write_cmd(ec, ACPI_EC_BURST_DISABLE);
-                acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
-        }
-        atomic_set(&ec->leaving_burst, 1);
-        return 0;
-      end:
-        ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode"));
-        return -1;
-}
-#endif                          /* ACPI_FUTURE_USAGE */
-
 static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
                                         const u8 * wdata, unsigned wdata_len,
                                         u8 * rdata, unsigned rdata_len)
@@ -312,6 +260,21 @@ static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
         return status;
 }
 
+/*
+ * Note: samsung nv5000 doesn't work with ec burst mode.
+ * http://bugzilla.kernel.org/show_bug.cgi?id=4980
+ */
+int acpi_ec_burst_enable(struct acpi_ec *ec)
+{
+        u8 d;
+        return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1);
+}
+
+int acpi_ec_burst_disable(struct acpi_ec *ec)
+{
+        return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0);
+}
+
 static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
 {
         int result;
@@ -333,18 +296,33 @@ static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
 /*
  * Externally callable EC access functions. For now, assume 1 EC only
  */
+int ec_burst_enable(void)
+{
+        if (!first_ec)
+                return -ENODEV;
+        return acpi_ec_burst_enable(first_ec);
+}
+
+EXPORT_SYMBOL(ec_burst_enable);
+
+int ec_burst_disable(void)
+{
+        if (!first_ec)
+                return -ENODEV;
+        return acpi_ec_burst_disable(first_ec);
+}
+
+EXPORT_SYMBOL(ec_burst_disable);
+
 int ec_read(u8 addr, u8 * val)
 {
-        struct acpi_ec *ec;
         int err;
         u8 temp_data;
 
         if (!first_ec)
                 return -ENODEV;
 
-        ec = acpi_driver_data(first_ec);
-
-        err = acpi_ec_read(ec, addr, &temp_data);
+        err = acpi_ec_read(first_ec, addr, &temp_data);
 
         if (!err) {
                 *val = temp_data;
@@ -357,15 +335,12 @@ 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);
+        err = acpi_ec_write(first_ec, addr, val);
 
         return err;
 }
@@ -376,14 +351,10 @@ int ec_transaction(u8 command,
                    const u8 * wdata, unsigned wdata_len,
                    u8 * rdata, unsigned rdata_len)
 {
-        struct acpi_ec *ec;
-
         if (!first_ec)
                 return -ENODEV;
 
-        ec = acpi_driver_data(first_ec);
-
-        return acpi_ec_transaction(ec, command, wdata,
+        return acpi_ec_transaction(first_ec, command, wdata,
                                    wdata_len, rdata, rdata_len);
 }
 
@@ -420,7 +391,7 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
 
 static void acpi_ec_gpe_query(void *ec_cxt)
 {
-        struct acpi_ec *ec = (struct acpi_ec *)ec_cxt;
+        struct acpi_ec *ec = ec_cxt;
         u8 value = 0;
         char object_name[8];
 
@@ -438,8 +409,9 @@ static u32 acpi_ec_gpe_handler(void *data)
 {
         acpi_status status = AE_OK;
         u8 value;
-        struct acpi_ec *ec = (struct acpi_ec *)data;
+        struct acpi_ec *ec = data;
         atomic_inc(&ec->event_count);
+
         if (acpi_ec_mode == EC_INTR) {
                 wake_up(&ec->wait);
         }
@@ -482,7 +454,7 @@ acpi_ec_space_handler(u32 function,
                       void *handler_context, void *region_context)
 {
         int result = 0;
-        struct acpi_ec *ec = NULL;
+        struct acpi_ec *ec = handler_context;
         u64 temp = *value;
         acpi_integer f_v = 0;
         int i = 0;
@@ -494,8 +466,6 @@ acpi_ec_space_handler(u32 function,
                 return AE_BAD_PARAMETER;
         }
 
-        ec = (struct acpi_ec *)handler_context;
-
       next_byte:
         switch (function) {
         case ACPI_READ:
@@ -551,18 +521,16 @@ 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;
+        struct acpi_ec *ec = seq->private;
 
         if (!ec)
                 goto end;
 
-        seq_printf(seq, "gpe:                 0x%02x\n", (u32) ec->gpe);
-        seq_printf(seq, "ports:                   0x%02x, 0x%02x\n",
-                   (u32) ec->command_addr, (u32) ec->data_addr);
-        seq_printf(seq, "use global lock:         %s\n",
+        seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe);
+        seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n",
+                   (unsigned)ec->command_addr, (unsigned)ec->data_addr);
+        seq_printf(seq, "use global lock:\t%s\n",
                    ec->global_lock ? "yes" : "no");
-        acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
-
       end:
         return 0;
 }
@@ -619,154 +587,122 @@ static int acpi_ec_remove_fs(struct acpi_device *device)
 /* --------------------------------------------------------------------------
                                Driver Interface
    -------------------------------------------------------------------------- */
+static acpi_status
+ec_parse_io_ports(struct acpi_resource *resource, void *context);
+
+static acpi_status
+ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval);
+
+static struct acpi_ec *make_acpi_ec(void)
+{
+        struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
+        if (!ec)
+                return NULL;
+
+        atomic_set(&ec->query_pending, 1);
+        atomic_set(&ec->event_count, 1);
+        mutex_init(&ec->lock);
+        init_waitqueue_head(&ec->wait);
+
+        return ec;
+}
 
 static int acpi_ec_add(struct acpi_device *device)
 {
-        int result = 0;
         acpi_status status = AE_OK;
         struct acpi_ec *ec = NULL;
 
         if (!device)
                 return -EINVAL;
 
-        ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
-        if (!ec)
-                return -ENOMEM;
-
-        ec->handle = device->handle;
-        ec->uid = -1;
-        mutex_init(&ec->lock);
-        atomic_set(&ec->query_pending, 0);
-        atomic_set(&ec->event_count, 1);
-        if (acpi_ec_mode == EC_INTR) {
-                atomic_set(&ec->leaving_burst, 1);
-                init_waitqueue_head(&ec->wait);
-        }
         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);
-
-        /* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
-           http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
-        if (ec_ecdt) {
-                acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
-                                                  ACPI_ADR_SPACE_EC,
-                                                  &acpi_ec_space_handler);
 
-                acpi_remove_gpe_handler(NULL, ec_ecdt->gpe,
-                                        &acpi_ec_gpe_handler);
+        ec = make_acpi_ec();
+        if (!ec)
+                return -ENOMEM;
 
-                kfree(ec_ecdt);
+        status = ec_parse_device(device->handle, 0, ec, NULL);
+        if (status != AE_CTRL_TERMINATE) {
+                kfree(ec);
+                return -EINVAL;
         }
 
-        /* Get GPE bit assignment (EC events). */
-        /* TODO: Add support for _GPE returning a package */
-        status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe);
-        if (ACPI_FAILURE(status)) {
-                ACPI_EXCEPTION((AE_INFO, status,
-                                "Obtaining GPE bit assignment"));
-                result = -ENODEV;
-                goto end;
-        }
+        /* Check if we found the boot EC */
+        if (boot_ec) {
+                if (boot_ec->gpe == ec->gpe) {
+                        /* We might have incorrect info for GL at boot time */
+                        mutex_lock(&boot_ec->lock);
+                        boot_ec->global_lock = ec->global_lock;
+                        mutex_unlock(&boot_ec->lock);
+                        kfree(ec);
+                        ec = boot_ec;
+                }
+        } else
+                first_ec = ec;
+        ec->handle = device->handle;
+        acpi_driver_data(device) = ec;
 
-        result = acpi_ec_add_fs(device);
-        if (result)
-                goto end;
+        acpi_ec_add_fs(device);
 
         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s [%s] (gpe %d) interrupt mode.",
                           acpi_device_name(device), acpi_device_bid(device),
                           (u32) ec->gpe));
 
-        if (!first_ec)
-                first_ec = device;
-
-      end:
-        if (result)
-                kfree(ec);
-
-        return result;
+        return 0;
 }
 
 static int acpi_ec_remove(struct acpi_device *device, int type)
 {
-        struct acpi_ec *ec = NULL;
+        struct acpi_ec *ec;
 
         if (!device)
                 return -EINVAL;
 
         ec = acpi_driver_data(device);
-
         acpi_ec_remove_fs(device);
+        acpi_driver_data(device) = NULL;
+        if (ec == first_ec)
+                first_ec = NULL;
 
-        kfree(ec);
-
+        /* Don't touch boot EC */
+        if (boot_ec != ec)
+                kfree(ec);
         return 0;
 }
 
 static acpi_status
-acpi_ec_io_ports(struct acpi_resource *resource, void *context)
+ec_parse_io_ports(struct acpi_resource *resource, void *context)
 {
-        struct acpi_ec *ec = (struct acpi_ec *)context;
+        struct acpi_ec *ec = context;
 
-        if (resource->type != ACPI_RESOURCE_TYPE_IO) {
+        if (resource->type != ACPI_RESOURCE_TYPE_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 == 0) {
+        if (ec->data_addr == 0)
                 ec->data_addr = resource->data.io.minimum;
-        } else if (ec->command_addr == 0) {
+        else if (ec->command_addr == 0)
                 ec->command_addr = resource->data.io.minimum;
-        } else {
+        else
                 return AE_CTRL_TERMINATE;
-        }
 
         return AE_OK;
 }
 
-static int acpi_ec_start(struct acpi_device *device)
+static int ec_install_handlers(struct acpi_ec *ec)
 {
-        acpi_status status = AE_OK;
-        struct acpi_ec *ec = NULL;
-
-        if (!device)
-                return -EINVAL;
-
-        ec = acpi_driver_data(device);
-
-        if (!ec)
-                return -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 == 0) {
-                ACPI_EXCEPTION((AE_INFO, status,
-                                "Error getting I/O port addresses"));
-                return -ENODEV;
-        }
-
-        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02lx, ports=0x%2lx,0x%2lx",
-                          ec->gpe, ec->command_addr, ec->data_addr));
-
-        /*
-         * Install GPE handler
-         */
+        acpi_status status;
         status = acpi_install_gpe_handler(NULL, ec->gpe,
                                           ACPI_GPE_EDGE_TRIGGERED,
                                           &acpi_ec_gpe_handler, ec);
-        if (ACPI_FAILURE(status)) {
+        if (ACPI_FAILURE(status))
                 return -ENODEV;
-        }
+
         acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
         acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
 
@@ -779,18 +715,49 @@ static int acpi_ec_start(struct acpi_device *device)
                 return -ENODEV;
         }
 
-        return AE_OK;
+        /* EC is fully operational, allow queries */
+        atomic_set(&ec->query_pending, 0);
+
+        return 0;
+}
+
+static int acpi_ec_start(struct acpi_device *device)
+{
+        struct acpi_ec *ec;
+
+        if (!device)
+                return -EINVAL;
+
+        ec = acpi_driver_data(device);
+
+        if (!ec)
+                return -EINVAL;
+
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02lx, ports=0x%2lx,0x%2lx",
+                          ec->gpe, ec->command_addr, ec->data_addr));
+
+        /* Boot EC is already working */
+        if (ec == boot_ec)
+                return 0;
+
+        return ec_install_handlers(ec);
 }
 
 static int acpi_ec_stop(struct acpi_device *device, int type)
 {
-        acpi_status status = AE_OK;
-        struct acpi_ec *ec = NULL;
+        acpi_status status;
+        struct acpi_ec *ec;
 
         if (!device)
                 return -EINVAL;
 
         ec = acpi_driver_data(device);
+        if (!ec)
+                return -EINVAL;
+
+        /* Don't touch boot EC */
+        if (ec == boot_ec)
+                return 0;
 
         status = acpi_remove_address_space_handler(ec->handle,
                                                    ACPI_ADR_SPACE_EC,
@@ -805,164 +772,67 @@ static int acpi_ec_stop(struct acpi_device *device, int type)
         return 0;
 }
 
-static acpi_status __init
-acpi_fake_ecdt_callback(acpi_handle handle,
-                        u32 Level, void *context, void **retval)
+static acpi_status
+ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
 {
         acpi_status status;
 
-        mutex_init(&ec_ecdt->lock);
-        atomic_set(&ec_ecdt->event_count, 1);
-        if (acpi_ec_mode == EC_INTR) {
-                init_waitqueue_head(&ec_ecdt->wait);
-        }
+        struct acpi_ec *ec = context;
         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
-                                     acpi_ec_io_ports, ec_ecdt);
+                                     ec_parse_io_ports, ec);
         if (ACPI_FAILURE(status))
                 return status;
 
-        ec_ecdt->uid = -1;
-        acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid);
-
-        status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe);
+        /* Get GPE bit assignment (EC events). */
+        /* TODO: Add support for _GPE returning a package */
+        status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe);
         if (ACPI_FAILURE(status))
                 return status;
-        ec_ecdt->global_lock = TRUE;
-        ec_ecdt->handle = handle;
-
-        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx",
-                          ec_ecdt->gpe, ec_ecdt->command_addr,
-                          ec_ecdt->data_addr));
 
-        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;
+        /* Use the global lock for all EC transactions? */
+        acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock);
 
-        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Try to make an fake ECDT"));
+        ec->handle = handle;
 
-        ec_ecdt = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
-        if (!ec_ecdt) {
-                ret = -ENOMEM;
-                goto error;
-        }
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx",
+                          ec->gpe, ec->command_addr, ec->data_addr));
 
-        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;
-                ACPI_EXCEPTION((AE_INFO, status, "Can't make an fake ECDT"));
-                goto error;
-        }
-        return 0;
-      error:
-        return ret;
+        return AE_CTRL_TERMINATE;
 }
 
-static int __init acpi_ec_get_real_ecdt(void)
+int __init acpi_ec_ecdt_probe(void)
 {
+        int ret;
         acpi_status status;
         struct acpi_table_ecdt *ecdt_ptr;
 
-        status = acpi_get_table(ACPI_SIG_ECDT, 1,
-                                (struct acpi_table_header **)&ecdt_ptr);
-        if (ACPI_FAILURE(status))
-                return -ENODEV;
-
-        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT"));
-
+        boot_ec = make_acpi_ec();
+        if (!boot_ec)
+                return -ENOMEM;
         /*
-         * Generate a temporary ec context to use until the namespace is scanned
+         * Generate a boot ec context
          */
-        ec_ecdt = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
-        if (!ec_ecdt)
-                return -ENOMEM;
 
-        mutex_init(&ec_ecdt->lock);
-        atomic_set(&ec_ecdt->event_count, 1);
-        if (acpi_ec_mode == EC_INTR) {
-                init_waitqueue_head(&ec_ecdt->wait);
-        }
-        ec_ecdt->command_addr = ecdt_ptr->control.address;
-        ec_ecdt->data_addr = ecdt_ptr->data.address;
-        ec_ecdt->gpe = ecdt_ptr->gpe;
-        /* 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->id, &ec_ecdt->handle);
-        if (ACPI_FAILURE(status)) {
+        status = acpi_get_table(ACPI_SIG_ECDT, 1,
+                                (struct acpi_table_header **)&ecdt_ptr);
+        if (ACPI_FAILURE(status))
                 goto error;
-        }
-
-        return 0;
-      error:
-        ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT"));
-        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;
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT"));
 
-        ret = acpi_ec_get_real_ecdt();
-        /* Try to make a fake ECDT */
-        if (ret && acpi_fake_ecdt_enabled) {
-                ret = acpi_ec_fake_ecdt();
-        }
+        boot_ec->command_addr = ecdt_ptr->control.address;
+        boot_ec->data_addr = ecdt_ptr->data.address;
+        boot_ec->gpe = ecdt_ptr->gpe;
+        boot_ec->handle = ACPI_ROOT_OBJECT;
 
-        if (ret)
+        ret = ec_install_handlers(boot_ec);
+        if (!ret) {
+                first_ec = boot_ec;
                 return 0;
-
-        /*
-         * Install GPE handler
-         */
-        status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe,
-                                          ACPI_GPE_EDGE_TRIGGERED,
-                                          &acpi_ec_gpe_handler, ec_ecdt);
-        if (ACPI_FAILURE(status)) {
-                goto error;
         }
-        acpi_set_gpe_type(NULL, ec_ecdt->gpe, ACPI_GPE_TYPE_RUNTIME);
-        acpi_enable_gpe(NULL, ec_ecdt->gpe, 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,
-                                        &acpi_ec_gpe_handler);
-                goto error;
-        }
-
-        return 0;
-
       error:
-        ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT"));
-        kfree(ec_ecdt);
-        ec_ecdt = NULL;
+        kfree(boot_ec);
+        boot_ec = NULL;
 
         return -ENODEV;
 }
@@ -1003,13 +873,6 @@ static void __exit acpi_ec_exit(void)
 }
 #endif                          /* 0 */
 
-static int __init acpi_fake_ecdt_setup(char *str)
-{
-        acpi_fake_ecdt_enabled = 1;
-        return 1;
-}
-
-__setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
 static int __init acpi_ec_set_intr_mode(char *str)
 {
         int intr;
@@ -1017,12 +880,8 @@ static int __init acpi_ec_set_intr_mode(char *str)
         if (!get_option(&str, &intr))
                 return 0;
 
-        if (intr) {
-                acpi_ec_mode = EC_INTR;
-        } else {
-                acpi_ec_mode = EC_POLL;
-        }
-        acpi_ec_driver.ops.add = acpi_ec_add;
+        acpi_ec_mode = (intr) ? EC_INTR : EC_POLL;
+
         printk(KERN_NOTICE PREFIX "%s mode.\n", intr ? "interrupt" : "polling");
 
         return 1;