Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4c611060660f0de3e9b8f02df207312bc6f5c331
Commit:     4c611060660f0de3e9b8f02df207312bc6f5c331
Parent:     40ffbfad6bb79a99cc7627bdaca0ee22dec526f6
Author:     Alexey Starikovskiy <[EMAIL PROTECTED]>
AuthorDate: Wed Sep 5 19:56:38 2007 -0400
Committer:  Len Brown <[EMAIL PROTECTED]>
CommitDate: Wed Sep 5 19:56:38 2007 -0400

    ACPI: EC: Drop ECDT-based boot_ec as soon as we find DSDT-based one.
    
    ASUS notebooks have numerous problems with EC initialization
    This patch tries to work around three known issues reported
    in bugzilla 8598, 8709 and 8909/8919.
    
    Signed-off-by: Alexey Starikovskiy <[EMAIL PROTECTED]>
    Signed-off-by: Len Brown <[EMAIL PROTECTED]>
---
 drivers/acpi/ec.c |   90 +++++++++++++++++++++++------------------------------
 1 files changed, 39 insertions(+), 51 deletions(-)

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 3f7935a..9cd7997 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -121,6 +121,7 @@ static struct acpi_ec {
        atomic_t event_count;
        wait_queue_head_t wait;
        struct list_head list;
+       u8 handlers_installed;
 } *boot_ec, *first_ec;
 
 /* --------------------------------------------------------------------------
@@ -680,32 +681,50 @@ ec_parse_device(acpi_handle handle, u32 Level, void 
*context, void **retval)
        status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe);
        if (ACPI_FAILURE(status))
                return status;
-
        /* Find and register all query methods */
        acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1,
                            acpi_ec_register_query_methods, ec, NULL);
-
        /* Use the global lock for all EC transactions? */
        acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock);
-
        ec->handle = handle;
-
-       printk(KERN_INFO PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data 
= 0x%lx\n",
-                         ec->gpe, ec->command_addr, ec->data_addr);
-
        return AE_CTRL_TERMINATE;
 }
 
+static void ec_remove_handlers(struct acpi_ec *ec)
+{
+       if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
+                               ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
+               printk(KERN_ERR PREFIX "failed to remove space handler\n");
+       if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
+                               &acpi_ec_gpe_handler)))
+               printk(KERN_ERR PREFIX "failed to remove gpe handler\n");
+       ec->handlers_installed = 0;
+}
+
 static int acpi_ec_add(struct acpi_device *device)
 {
        struct acpi_ec *ec = NULL;
 
        if (!device)
                return -EINVAL;
-
        strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
        strcpy(acpi_device_class(device), ACPI_EC_CLASS);
 
+       /* Check for boot EC */
+       if (boot_ec) {
+               if (boot_ec->handle == device->handle) {
+                       /* Pre-loaded EC from DSDT, just move pointer */
+                       ec = boot_ec;
+                       boot_ec = NULL;
+                       goto end;
+               } else if (boot_ec->handle == ACPI_ROOT_OBJECT) {
+                       /* ECDT-based EC, time to shut it down */
+                       ec_remove_handlers(boot_ec);
+                       kfree(boot_ec);
+                       first_ec = boot_ec = NULL;
+               }
+       }
+
        ec = make_acpi_ec();
        if (!ec)
                return -ENOMEM;
@@ -715,25 +734,14 @@ static int acpi_ec_add(struct acpi_device *device)
                kfree(ec);
                return -EINVAL;
        }
-
-       /* 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;
-                       /* Copy handlers from new ec into boot ec */
-                       list_splice(&ec->list, &boot_ec->list);
-                       mutex_unlock(&boot_ec->lock);
-                       kfree(ec);
-                       ec = boot_ec;
-               }
-       } else
-               first_ec = ec;
        ec->handle = device->handle;
+      end:
+       if (!first_ec)
+               first_ec = ec;
        acpi_driver_data(device) = ec;
-
        acpi_ec_add_fs(device);
+       printk(KERN_INFO PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data 
= 0x%lx\n",
+                         ec->gpe, ec->command_addr, ec->data_addr);
        return 0;
 }
 
@@ -756,10 +764,7 @@ static int acpi_ec_remove(struct acpi_device *device, int 
type)
        acpi_driver_data(device) = NULL;
        if (ec == first_ec)
                first_ec = NULL;
-
-       /* Don't touch boot EC */
-       if (boot_ec != ec)
-               kfree(ec);
+       kfree(ec);
        return 0;
 }
 
@@ -789,6 +794,8 @@ ec_parse_io_ports(struct acpi_resource *resource, void 
*context)
 static int ec_install_handlers(struct acpi_ec *ec)
 {
        acpi_status status;
+       if (ec->handlers_installed)
+               return 0;
        status = acpi_install_gpe_handler(NULL, ec->gpe,
                                          ACPI_GPE_EDGE_TRIGGERED,
                                          &acpi_ec_gpe_handler, ec);
@@ -807,6 +814,7 @@ static int ec_install_handlers(struct acpi_ec *ec)
                return -ENODEV;
        }
 
+       ec->handlers_installed = 1;
        return 0;
 }
 
@@ -823,41 +831,22 @@ static int acpi_ec_start(struct acpi_device *device)
        if (!ec)
                return -EINVAL;
 
-       /* Boot EC is already working */
-       if (ec != boot_ec)
-               ret = ec_install_handlers(ec);
+       ret = ec_install_handlers(ec);
 
        /* EC is fully operational, allow queries */
        atomic_set(&ec->query_pending, 0);
-
        return ret;
 }
 
 static int acpi_ec_stop(struct acpi_device *device, int type)
 {
-       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,
-                                                  &acpi_ec_space_handler);
-       if (ACPI_FAILURE(status))
-               return -ENODEV;
-
-       status = acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler);
-       if (ACPI_FAILURE(status))
-               return -ENODEV;
+       ec_remove_handlers(ec);
 
        return 0;
 }
@@ -877,7 +866,7 @@ int __init acpi_ec_ecdt_probe(void)
        status = acpi_get_table(ACPI_SIG_ECDT, 1,
                                (struct acpi_table_header **)&ecdt_ptr);
        if (ACPI_SUCCESS(status)) {
-               printk(KERN_INFO PREFIX "EC description table is found, 
configuring boot EC\n\n");
+               printk(KERN_INFO PREFIX "EC description table is found, 
configuring boot EC\n");
                boot_ec->command_addr = ecdt_ptr->control.address;
                boot_ec->data_addr = ecdt_ptr->data.address;
                boot_ec->gpe = ecdt_ptr->gpe;
@@ -899,7 +888,6 @@ int __init acpi_ec_ecdt_probe(void)
       error:
        kfree(boot_ec);
        boot_ec = NULL;
-
        return -ENODEV;
 }
 
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