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authorLen Brown <len.brown@intel.com>2007-10-10 00:30:55 -0400
committerLen Brown <len.brown@intel.com>2007-10-10 00:30:55 -0400
commit731aa5fd9971a5163845fbe55de63d686a11da0a (patch)
tree084c87dd364f00936eff3b64cbb50e7d3759f4f8 /drivers/acpi/ec.c
parent27345a5109f36779187311f77e30bcf596571c29 (diff)
parent4c611060660f0de3e9b8f02df207312bc6f5c331 (diff)
Pull bugzilla-8709 into release branch
Diffstat (limited to 'drivers/acpi/ec.c')
-rw-r--r--drivers/acpi/ec.c90
1 files changed, 39 insertions, 51 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index e9a04052084b..7b4178393e34 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;
/* --------------------------------------------------------------------------
@@ -679,32 +680,50 @@ 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;
@@ -714,25 +733,14 @@ 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;
}
@@ -755,10 +763,7 @@ 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;
}
@@ -788,6 +793,8 @@ 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);
@@ -806,6 +813,7 @@ static int ec_install_handlers(struct acpi_ec *ec)
return -ENODEV;
}
+ ec->handlers_installed = 1;
return 0;
}
@@ -822,41 +830,22 @@ 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;
}
@@ -876,7 +865,7 @@ 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;
@@ -898,7 +887,6 @@ int __init acpi_ec_ecdt_probe(void)
error:
kfree(boot_ec);
boot_ec = NULL;
-
return -ENODEV;
}