From patchwork Sat Oct 14 05:32:51 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Limonciello, Mario" X-Patchwork-Id: 10006211 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 27D946037E for ; Sat, 14 Oct 2017 05:33:24 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1B4A6291BD for ; Sat, 14 Oct 2017 05:33:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 10310291BE; Sat, 14 Oct 2017 05:33:24 +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=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham 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 AFB30291BB for ; Sat, 14 Oct 2017 05:33:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753636AbdJNFdU (ORCPT ); Sat, 14 Oct 2017 01:33:20 -0400 Received: from esa4.dell-outbound.iphmx.com ([68.232.149.214]:59321 "EHLO esa4.dell-outbound.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753567AbdJNFdF (ORCPT ); Sat, 14 Oct 2017 01:33:05 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=dell.com; i=@dell.com; q=dns/txt; s=smtpout; t=1507959185; x=1539495185; h=from:to:cc:subject:date:message-id; bh=xuXvYUsIbAuur62QQcSainlog+4Kf+09iOjBP3ZTHzY=; b=n5fo2rG2sNZxf211lbHY+D9ss/Ks0c6Oguy8wks1Mspf+UE9uDdPtaub neP+IqdbTtQwqgsA6a7dPAhCZ2rtFfx5er4iFXy6kR5UYGRiK9stHAzaQ FccHXwc6dDKP9ERWEG57flyO8TaJnsNcz1ZbwNAExpheUECn2XTC5MZ0n w=; Received: from esa6.dell-outbound2.iphmx.com ([68.232.154.99]) by esa4.dell-outbound.iphmx.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Oct 2017 00:33:01 -0500 Received: from ausxippc110.us.dell.com ([143.166.85.200]) by esa6.dell-outbound2.iphmx.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Oct 2017 11:33:00 +0600 X-LoopCount0: from 10.208.86.39 X-IronPort-AV: E=Sophos;i="5.43,374,1503378000"; d="scan'208";a="562232214" X-DLP: DLP_GlobalPCIDSS From: Mario Limonciello To: dvhart@infradead.org, Andy Shevchenko Cc: LKML , platform-driver-x86@vger.kernel.org, Andy Lutomirski , quasisec@google.com, pali.rohar@gmail.com, rjw@rjwysocki.net, mjg59@google.com, hch@lst.de, Greg KH , Alan Cox , Mario Limonciello Subject: [PATCH v8 13/15] platform/x86: wmi: Add sysfs attribute for required_buffer_size Date: Sat, 14 Oct 2017 00:32:51 -0500 Message-Id: X-Mailer: git-send-email 2.7.4 In-Reply-To: References: In-Reply-To: References: 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 Method type WMI objects need to be able to describe the size of the interface that they will expect to use. Export this information to sysfs and allow vendor drivers to set it. Signed-off-by: Mario Limonciello --- drivers/platform/x86/wmi.c | 31 +++++++++++++++++++++++++++++++ include/linux/wmi.h | 3 +++ 2 files changed, 34 insertions(+) diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c index bcb41c1c7f52..63d01f98bf4c 100644 --- a/drivers/platform/x86/wmi.c +++ b/drivers/platform/x86/wmi.c @@ -72,6 +72,7 @@ struct wmi_block { struct acpi_device *acpi_device; wmi_notify_handler handler; void *handler_data; + u64 req_buf_size; bool read_takes_no_args; }; @@ -188,6 +189,26 @@ static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) /* * Exported WMI functions */ + +/** + * set_required_buffer_size - Sets the buffer size needed for performing IOCTL + * @wdev: A wmi bus device from a driver + * @instance: Instance index + * + * Allocates memory needed for buffer, stores the buffer size in that memory + */ +int set_required_buffer_size(struct wmi_device *wdev, u8 instance, u64 length) +{ + struct wmi_block *wblock; + + wblock = container_of(wdev, struct wmi_block, dev); + if (!wblock) + return -ENODEV; + wblock->req_buf_size = length; + return 0; +} +EXPORT_SYMBOL_GPL(set_required_buffer_size); + /** * wmi_evaluate_method - Evaluate a WMI method * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba @@ -718,8 +739,18 @@ static struct attribute *wmi_data_attrs[] = { }; ATTRIBUTE_GROUPS(wmi_data); +static ssize_t required_buffer_size_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct wmi_block *wblock = dev_to_wblock(dev); + + return sprintf(buf, "%lld\n", wblock->req_buf_size); +} +static DEVICE_ATTR_RO(required_buffer_size); + static struct attribute *wmi_method_attrs[] = { &dev_attr_object_id.attr, + &dev_attr_required_buffer_size.attr, NULL, }; ATTRIBUTE_GROUPS(wmi_method); diff --git a/include/linux/wmi.h b/include/linux/wmi.h index ddee427e0721..a9a72a4c5ed8 100644 --- a/include/linux/wmi.h +++ b/include/linux/wmi.h @@ -36,6 +36,9 @@ extern acpi_status wmidev_evaluate_method(struct wmi_device *wdev, extern union acpi_object *wmidev_block_query(struct wmi_device *wdev, u8 instance); +extern int set_required_buffer_size(struct wmi_device *wdev, u8 instance, + u64 length); + struct wmi_device_id { const char *guid_string; };