From patchwork Thu Apr 12 10:42:38 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: 10338187 X-Patchwork-Delegate: dvhart@infradead.org 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 116FC60153 for ; Thu, 12 Apr 2018 10:43:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 023572879E for ; Thu, 12 Apr 2018 10:43:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id EAADB287A2; Thu, 12 Apr 2018 10:43:24 +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=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, 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 9BBA12879E for ; Thu, 12 Apr 2018 10:43:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752752AbeDLKnB (ORCPT ); Thu, 12 Apr 2018 06:43:01 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:36490 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752751AbeDLKnA (ORCPT ); Thu, 12 Apr 2018 06:43:00 -0400 Received: from 2.general.khfeng.us.vpn ([10.172.68.175] helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.76) (envelope-from ) id 1f6Zgl-0003bl-S4; Thu, 12 Apr 2018 10:42:48 +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 Cc: platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org, Kai-Heng Feng Subject: [PATCH v3 2/3] platform/x86: dell-*: Add interface for switchable graphics status query Date: Thu, 12 Apr 2018 18:42:38 +0800 Message-Id: <20180412104239.25584-2-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180412104239.25584-1-kai.heng.feng@canonical.com> References: <20180412104239.25584-1-kai.heng.feng@canonical.com> Sender: platform-driver-x86-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.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. Cc: Mario Limonciello Signed-off-by: Kai-Heng Feng --- v3: Simplify dell_switchable_gfx_is_enabled() by returning bool instead of error code. Use DMI_DEV_TYPE_OEM_STRING to match Dell System. v2: Mario suggested to squash the HDA part into the same series. drivers/platform/x86/dell-laptop.c | 17 +++++++++++++++++ drivers/platform/x86/dell-smbios-base.c | 2 ++ drivers/platform/x86/dell-smbios.h | 2 ++ include/linux/dell-common.h | 1 + 4 files changed, 22 insertions(+) diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c index 8ba820e6c3d0..033a27b190cc 100644 --- a/drivers/platform/x86/dell-laptop.c +++ b/drivers/platform/x86/dell-laptop.c @@ -2116,6 +2116,23 @@ int dell_micmute_led_set(int state) } EXPORT_SYMBOL_GPL(dell_micmute_led_set); +bool dell_switchable_gfx_is_enabled(void) +{ + struct calling_interface_buffer buffer; + struct calling_interface_token *token; + + token = dell_smbios_find_token(SWITCHABLE_GRAPHICS_ENABLE); + if (!token) + return false; + + dell_fill_request(&buffer, token->location, 0, 0, 0); + if (dell_send_request(&buffer, CLASS_TOKEN_READ, SELECT_TOKEN_STD)) + return false; + + return !!buffer.output[1]; +} +EXPORT_SYMBOL_GPL(dell_switchable_gfx_is_enabled); + static int __init dell_init(void) { struct calling_interface_token *token; diff --git a/drivers/platform/x86/dell-smbios-base.c b/drivers/platform/x86/dell-smbios-base.c index 33fb2a20458a..881ce42f0ca7 100644 --- a/drivers/platform/x86/dell-smbios-base.c +++ b/drivers/platform/x86/dell-smbios-base.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 d8adaf959740..7863e6a7cff8 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; diff --git a/include/linux/dell-common.h b/include/linux/dell-common.h index 37e4b614dd74..1a90bc9a3bea 100644 --- a/include/linux/dell-common.h +++ b/include/linux/dell-common.h @@ -3,5 +3,6 @@ #define __DELL_COMMON_H__ int dell_micmute_led_set(int on); +bool dell_switchable_gfx_is_enabled(void); #endif