platform/chrome: cros_ec_lpc: Add support for GOOG004 ACPI device

This patch removes platform_device_register() call and adds an ACPI
device id structure. The driver is now automatically probed for devices
with a GOOG0004 ACPI entry.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Benson Leung <bleung@chromium.org>

diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
index 6d80fb5..0ad6e29 100644 (file)
--- a/drivers/platform/chrome/Kconfig
+++ b/drivers/platform/chrome/Kconfig
@@ -49,7 +49,7 @@ config CROS_EC_CHARDEV
 
 config CROS_EC_LPC
         tristate "ChromeOS Embedded Controller (LPC)"
-        depends on MFD_CROS_EC && (X86 || COMPILE_TEST)
+        depends on MFD_CROS_EC && ACPI && (X86 || COMPILE_TEST)
         help
           If you say Y here, you get support for talking to the ChromeOS EC
           over an LPC bus. This uses a simple byte-level protocol with a

diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index bc2dc62..9070352 100644 (file)
--- a/drivers/platform/chrome/cros_ec_lpc.c
+++ b/drivers/platform/chrome/cros_ec_lpc.c
@@ -21,6 +21,7 @@
  * expensive.
  */
 
+#include <linux/acpi.h>
 #include <linux/dmi.h>
 #include <linux/delay.h>
 #include <linux/io.h>
@@ -32,6 +33,7 @@
 #include <linux/printk.h>
 
 #define DRV_NAME "cros_ec_lpcs"
+#define ACPI_DRV_NAME "GOOG0004"
 
 static int ec_response_timed_out(void)
 {
@@ -288,6 +290,12 @@ static int cros_ec_lpc_remove(struct platform_device *pdev)
        return 0;
 }
 
+static const struct acpi_device_id cros_ec_lpc_acpi_device_ids[] = {
+       { ACPI_DRV_NAME, 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(acpi, cros_ec_lpc_acpi_device_ids);
+
 static struct dmi_system_id cros_ec_lpc_dmi_table[] __initdata = {
        {
                /*
@@ -328,15 +336,12 @@ MODULE_DEVICE_TABLE(dmi, cros_ec_lpc_dmi_table);
 static struct platform_driver cros_ec_lpc_driver = {
        .driver = {
                .name = DRV_NAME,
+               .acpi_match_table = cros_ec_lpc_acpi_device_ids,
        },
        .probe = cros_ec_lpc_probe,
        .remove = cros_ec_lpc_remove,
 };
 
-static struct platform_device cros_ec_lpc_device = {
-       .name = DRV_NAME
-};
-
 static int __init cros_ec_lpc_init(void)
 {
        int ret;
@@ -356,21 +361,11 @@ static int __init cros_ec_lpc_init(void)
                return ret;
        }
 
-       /* Register the device, and it'll get hooked up automatically */
-       ret = platform_device_register(&cros_ec_lpc_device);
-       if (ret) {
-               pr_err(DRV_NAME ": can't register device: %d\n", ret);
-               platform_driver_unregister(&cros_ec_lpc_driver);
-               cros_ec_lpc_reg_destroy();
-               return ret;
-       }
-
        return 0;
 }
 
 static void __exit cros_ec_lpc_exit(void)
 {
-       platform_device_unregister(&cros_ec_lpc_device);
        platform_driver_unregister(&cros_ec_lpc_driver);
        cros_ec_lpc_reg_destroy();
 }