From patchwork Thu Mar 8 07:12:07 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai-Heng Feng X-Patchwork-Id: 10267069 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 D71CF6016D for ; Thu, 8 Mar 2018 07:12:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C02EB25E13 for ; Thu, 8 Mar 2018 07:12:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B4BCE26E49; Thu, 8 Mar 2018 07:12:39 +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=-1.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE autolearn=unavailable version=3.3.1 Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1D35A25E13 for ; Thu, 8 Mar 2018 07:12:39 +0000 (UTC) Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id 2815F26742D; Thu, 8 Mar 2018 08:12:30 +0100 (CET) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa0.perex.cz (Postfix, from userid 1000) id 73ACA267412; Thu, 8 Mar 2018 08:12:28 +0100 (CET) Received: from youngberry.canonical.com (youngberry.canonical.com [91.189.89.112]) by alsa0.perex.cz (Postfix) with ESMTP id E290A267253 for ; Thu, 8 Mar 2018 08:12:26 +0100 (CET) Received: from [175.41.48.77] (helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.76) (envelope-from ) id 1etpis-0006DB-LP; Thu, 08 Mar 2018 07:12:19 +0000 From: Kai-Heng Feng To: mjg59@srcf.ucam.org, pali.rohar@gmail.com, dvhart@infradead.org, andy@infradead.org, mario.limonciello@dell.com, tiwai@suse.com Date: Thu, 8 Mar 2018 15:12:07 +0800 Message-Id: <20180308071207.19850-2-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20180308071207.19850-1-kai.heng.feng@canonical.com> References: <20180308071207.19850-1-kai.heng.feng@canonical.com> Cc: alsa-devel@alsa-project.org, Kai-Heng Feng , linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org Subject: [alsa-devel] [PATCH 2/2] platform/x86: dell-*: Add interface for switchable graphics status query X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org X-Virus-Scanned: ClamAV using ClamSMTP On some Dell platforms, there's a BIOS option "Enable Switchable Graphics". This information is useful if we want to do different things based on this value, e.g. disable unused audio controller that comes with the discrete graphics. Signed-off-by: Kai-Heng Feng Reviewed-by: Mario Limonciello --- drivers/platform/x86/dell-laptop.c | 23 +++++++++++++++++++++++ drivers/platform/x86/dell-smbios.c | 2 ++ drivers/platform/x86/dell-smbios.h | 2 ++ 3 files changed, 27 insertions(+) diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c index 8ba820e6c3d0..3f6fc07b8cf2 100644 --- a/drivers/platform/x86/dell-laptop.c +++ b/drivers/platform/x86/dell-laptop.c @@ -2116,6 +2116,29 @@ int dell_micmute_led_set(int state) } EXPORT_SYMBOL_GPL(dell_micmute_led_set); +int dell_switchable_gfx_enabled(bool *enabled) +{ + struct calling_interface_buffer buffer; + struct calling_interface_token *token; + int ret; + + *enabled = false; + + token = dell_smbios_find_token(SWITCHABLE_GRAPHICS_ENABLE); + if (!token) + return -ENODEV; + + dell_fill_request(&buffer, token->location, 0, 0, 0); + ret = dell_send_request(&buffer, CLASS_TOKEN_READ, SELECT_TOKEN_STD); + if (ret) + return ret; + + *enabled = !!buffer.output[1]; + + return 0; +} +EXPORT_SYMBOL_GPL(dell_switchable_gfx_enabled); + static int __init dell_init(void) { struct calling_interface_token *token; diff --git a/drivers/platform/x86/dell-smbios.c b/drivers/platform/x86/dell-smbios.c index 8541cde4cb7d..ca38b9d9dcf4 100644 --- a/drivers/platform/x86/dell-smbios.c +++ b/drivers/platform/x86/dell-smbios.c @@ -86,6 +86,8 @@ struct token_range { static struct token_range token_whitelist[] = { /* used by userspace: fwupdate */ {CAP_SYS_ADMIN, CAPSULE_EN_TOKEN, CAPSULE_DIS_TOKEN}, + /* can indicate to userspace Switchable Graphics enable status */ + {CAP_SYS_ADMIN, SWITCHABLE_GRAPHICS_ENABLE, SWITCHABLE_GRAPHICS_DISABLE}, /* can indicate to userspace that WMI is needed */ {0x0000, WSMT_EN_TOKEN, WSMT_DIS_TOKEN} }; diff --git a/drivers/platform/x86/dell-smbios.h b/drivers/platform/x86/dell-smbios.h index 138d478d9adc..b012d4abd239 100644 --- a/drivers/platform/x86/dell-smbios.h +++ b/drivers/platform/x86/dell-smbios.h @@ -37,6 +37,8 @@ #define KBD_LED_AUTO_100_TOKEN 0x02F6 #define GLOBAL_MIC_MUTE_ENABLE 0x0364 #define GLOBAL_MIC_MUTE_DISABLE 0x0365 +#define SWITCHABLE_GRAPHICS_ENABLE 0x037A +#define SWITCHABLE_GRAPHICS_DISABLE 0x037B struct notifier_block;