diff options
| author | Alexey Starikovskiy <astarikovskiy@suse.de> | 2007-08-03 17:52:48 -0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-08-03 17:52:48 -0400 |
| commit | cd8c93a4e04dce8f00d1ef3a476aac8bd65ae40b (patch) | |
| tree | 46872a60d90b61752cc1b4f1533e00ba648eed7d /drivers/acpi/ec.c | |
| parent | f1cd1fe61b96e4312312d42c0a9784dfab12e007 (diff) | |
ACPI: EC: If ECDT is not found, look up EC in DSDT.
Some ASUS laptops access EC space from device _INI methods, but do not
provide ECDT for early EC setup. In order to make them function properly,
there is a need to find EC is DSDT before any _INI is called.
Similar functionality was turned on by acpi_fake_ecdt=1 command line
before. Now it is on all the time.
http://bugzilla.kernel.org/show_bug.cgi?id=8598
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/ec.c')
| -rw-r--r-- | drivers/acpi/ec.c | 50 |
1 files changed, 28 insertions, 22 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index dd384ec757dd..4d7fe829a6e2 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -664,30 +664,32 @@ acpi_ec_register_query_methods(acpi_handle handle, u32 level, return AE_OK; } -static int ec_parse_device(struct acpi_ec *ec, acpi_handle handle) +static acpi_status +ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) { - if (ACPI_FAILURE(acpi_walk_resources(handle, METHOD_NAME__CRS, - ec_parse_io_ports, ec))) - return -EINVAL; + acpi_status status; + + struct acpi_ec *ec = context; + status = acpi_walk_resources(handle, METHOD_NAME__CRS, + ec_parse_io_ports, ec); + if (ACPI_FAILURE(status)) + return status; /* Get GPE bit assignment (EC events). */ /* TODO: Add support for _GPE returning a package */ - if (ACPI_FAILURE(acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe))) - return -EINVAL; + status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe); + if (ACPI_FAILURE(status)) + return status; /* Use the global lock for all EC transactions? */ acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock); - /* Find and register all query methods */ - acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1, - acpi_ec_register_query_methods, ec, NULL); - ec->handle = handle; printk(KERN_INFO PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx", ec->gpe, ec->command_addr, ec->data_addr); - return 0; + return AE_CTRL_TERMINATE; } static int acpi_ec_add(struct acpi_device *device) @@ -704,7 +706,8 @@ static int acpi_ec_add(struct acpi_device *device) if (!ec) return -ENOMEM; - if (ec_parse_device(ec, device->handle)) { + if (ec_parse_device(device->handle, 0, ec, NULL) != + AE_CTRL_TERMINATE) { kfree(ec); return -EINVAL; } @@ -867,18 +870,21 @@ int __init acpi_ec_ecdt_probe(void) /* * Generate a boot ec context */ - status = acpi_get_table(ACPI_SIG_ECDT, 1, (struct acpi_table_header **)&ecdt_ptr); - if (ACPI_FAILURE(status)) - goto error; - - 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; - boot_ec->handle = ACPI_ROOT_OBJECT; + if (ACPI_SUCCESS(status)) { + printk(KERN_INFO PREFIX "EC description table is found, configuring boot EC\n\n"); + 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; + } else { + printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); + status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, + boot_ec, NULL); + if (ACPI_FAILURE(status)) + goto error; + } ret = ec_install_handlers(boot_ec); if (!ret) { |