ACPI: EC: Add ec_get_handle()

BugLink: http://bugs.launchpad.net/bugs/810015

toshiba_acpi needs to execute an AML method within the EC namespace
to make hotkeys work on some platforms. Provide an interface to
allow it to easily get a handle to the EC namespace for this purpose.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
(cherry picked from commit 3e2abc5a35d25442821e1733687b7abbc83b5072)

Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index b19a18d..e37615f 100644 (file)
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -445,6 +445,16 @@ int ec_transaction(u8 command,
 
 EXPORT_SYMBOL(ec_transaction);
 
+/* Get the handle to the EC device */
+acpi_handle ec_get_handle(void)
+{
+       if (!first_ec)
+               return NULL;
+       return first_ec->handle;
+}
+
+EXPORT_SYMBOL(ec_get_handle);
+
 void acpi_ec_block_transactions(void)
 {
        struct acpi_ec *ec = first_ec;

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 6001b4d..ecccbb7 100644 (file)
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -151,6 +151,7 @@ extern int ec_write(u8 addr, u8 val);
 extern int ec_transaction(u8 command,
                           const u8 *wdata, unsigned wdata_len,
                           u8 *rdata, unsigned rdata_len);
+extern acpi_handle ec_get_handle(void);
 
 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)