From patchwork Thu Oct 12 17:33:21 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thierry Escande X-Patchwork-Id: 10002439 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7D435603B5 for ; Thu, 12 Oct 2017 17:34:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 68B0928D5E for ; Thu, 12 Oct 2017 17:34:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5D5FA28DE9; Thu, 12 Oct 2017 17:34:43 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DBDD828E03 for ; Thu, 12 Oct 2017 17:34:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753279AbdJLRdi (ORCPT ); Thu, 12 Oct 2017 13:33:38 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:40838 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751901AbdJLRdh (ORCPT ); Thu, 12 Oct 2017 13:33:37 -0400 Received: from localhost.localdomain (unknown [IPv6:2a01:e35:8a7e:4790:9db0:1a4e:ec01:3bee]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: tescande) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id 02E9026DA8A; Thu, 12 Oct 2017 18:33:35 +0100 (BST) From: Thierry Escande To: Benson Leung , Jonathan Cameron Cc: Enric Balletbo i Serra , Gwendal Grignou , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 1/4] platform/chrome: cros_ec_lpc: Register the driver if ACPI entry is missing. Date: Thu, 12 Oct 2017 19:33:21 +0200 Message-Id: <1507829604-16011-2-git-send-email-thierry.escande@collabora.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1507829604-16011-1-git-send-email-thierry.escande@collabora.com> References: <1507829604-16011-1-git-send-email-thierry.escande@collabora.com> MIME-Version: 1.0 Content-Transfert-Encoding: 8bit Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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(); }