Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752728AbdLANmd (ORCPT ); Fri, 1 Dec 2017 08:42:33 -0500 Received: from bhuna.collabora.co.uk ([46.235.227.227]:39948 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752379AbdLANmb (ORCPT ); Fri, 1 Dec 2017 08:42:31 -0500 From: Thierry Escande To: Benson Leung , Lee Jones , Jonathan Cameron Cc: Enric Balletbo i Serra , Gwendal Grignou , linux-kernel@vger.kernel.org Subject: [PATCH v5 1/3] platform/chrome: cros_ec_lpc: Register the driver if ACPI entry is missing. Date: Fri, 1 Dec 2017 14:42:21 +0100 Message-Id: <1512135743-16529-2-git-send-email-thierry.escande@collabora.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1512135743-16529-1-git-send-email-thierry.escande@collabora.com> References: <1512135743-16529-1-git-send-email-thierry.escande@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset = "utf-8" Content-Transfert-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2690 Lines: 84 From: Enric Balletbo i Serra Commit 12278dc7c572 ("platform/chrome: cros_ec_lpc: Add support for GOOG004 ACPI device") added support when the firmware reports the ACPI device, there are some firmwares though that doesn't report this device but have it. In such cases we need to instantiate the driver explicitly if it is not instantiated through ACPI. Fixes: 12278dc7c572 ("platform/chrome: cros_ec_lpc: Add support for GOOG004 ACPI device") Signed-off-by: Guenter Roeck Signed-off-by: Enric Balletbo i Serra Signed-off-by: Thierry Escande --- drivers/platform/chrome/cros_ec_lpc.c | 34 +++++++++++++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c index 1baf720..0b26a09 100644 --- a/drivers/platform/chrome/cros_ec_lpc.c +++ b/drivers/platform/chrome/cros_ec_lpc.c @@ -35,6 +35,9 @@ #define DRV_NAME "cros_ec_lpcs" #define ACPI_DRV_NAME "GOOG0004" +/* True if ACPI device is present */ +static bool cros_ec_lpc_acpi_device_found; + static int ec_response_timed_out(void) { unsigned long one_second = jiffies + HZ; @@ -396,9 +399,21 @@ static struct platform_driver cros_ec_lpc_driver = { .remove = cros_ec_lpc_remove, }; +static struct platform_device cros_ec_lpc_device = { + .name = DRV_NAME +}; + +static acpi_status cros_ec_lpc_parse_device(acpi_handle handle, u32 level, + void *context, void **retval) +{ + *(bool *)context = true; + return AE_CTRL_TERMINATE; +} + static int __init cros_ec_lpc_init(void) { int ret; + acpi_status status; if (!dmi_check_system(cros_ec_lpc_dmi_table)) { pr_err(DRV_NAME ": unsupported system.\n"); @@ -415,11 +430,28 @@ static int __init cros_ec_lpc_init(void) return ret; } - return 0; + status = acpi_get_devices(ACPI_DRV_NAME, cros_ec_lpc_parse_device, + &cros_ec_lpc_acpi_device_found, NULL); + if (ACPI_FAILURE(status)) + pr_warn(DRV_NAME ": Looking for %s failed\n", ACPI_DRV_NAME); + + if (!cros_ec_lpc_acpi_device_found) { + /* 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; } static void __exit cros_ec_lpc_exit(void) { + if (!cros_ec_lpc_acpi_device_found) + platform_device_unregister(&cros_ec_lpc_device); platform_driver_unregister(&cros_ec_lpc_driver); cros_ec_lpc_reg_destroy(); } -- 2.7.4