From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D1A21C072B1 for ; Thu, 30 May 2019 04:51:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A62B425D4A for ; Thu, 30 May 2019 04:51:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559191870; bh=nkRGmyUwdjOOZEN1bV2aoAyTIqai0OB2YKorjIp4+Y4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Y3xE2d5mZ4S+cdZ0bqV1ajl8h+gfnz8UvIXBFDgDH3PGxIm7nJI/yAqAVoiFsgce7 df0WDpinhR/itiQDfhL5O4/0MwV94tigzKwfvMxST0WlsZxkahfajkVM1p9IsqDCc5 NC3mH26zm1IusfiAy9lKM0/5/awDq4NgSN4k2Sz8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733280AbfE3EvD (ORCPT ); Thu, 30 May 2019 00:51:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:49558 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728308AbfE3DLA (ORCPT ); Wed, 29 May 2019 23:11:00 -0400 Received: from localhost (ip67-88-213-2.z213-88-67.customer.algx.net [67.88.213.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 40531244E6; Thu, 30 May 2019 03:10:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559185859; bh=nkRGmyUwdjOOZEN1bV2aoAyTIqai0OB2YKorjIp4+Y4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NSrytK6mhDpFGXPxO9FPlc1lK8ir0It5ZcdcdtjKa7P+ae1HXv/lWT2E6PhgubJL6 huxxl9bWyaYTqvk/5AkzR9zCabQZDZMUP7NofMQg7Xswr5/Xulr3/ggLIHDMmE63Di hooe4//UiIIbZm1Ywq59SH6g52+NOiYt+p0f5OXY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hans de Goede , Benjamin Tissoires , Sasha Levin Subject: [PATCH 5.1 146/405] HID: logitech-hidpp: use RAP instead of FAP to get the protocol version Date: Wed, 29 May 2019 20:02:24 -0700 Message-Id: <20190530030548.514088806@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190530030540.291644921@linuxfoundation.org> References: <20190530030540.291644921@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ Upstream commit 096377525cdb8251e4656085efc988bdf733fb4c ] According to the logitech_hidpp_2.0_specification_draft_2012-06-04.pdf doc: https://lekensteyn.nl/files/logitech/logitech_hidpp_2.0_specification_draft_2012-06-04.pdf We should use a register-access-protocol request using the short input / output report ids. This is necessary because 27MHz HID++ receivers have a max-packetsize on their HIP++ endpoint of 8, so they cannot support long reports. Using a feature-access-protocol request (which is always long or very-long) with these will cause a timeout error, followed by the hidpp driver treating the device as not being HID++ capable. This commit fixes this by switching to using a rap request to get the protocol version. Besides being tested with a (046d:c517) 27MHz receiver with various 27MHz keyboards and mice, this has also been tested to not cause regressions on a non-unifying dual-HID++ nano receiver (046d:c534) with k270 and m185 HID++-2.0 devices connected and on a unifying/dj receiver (046d:c52b) with a HID++-2.0 Logitech Rechargeable Touchpad T650. Signed-off-by: Hans de Goede Signed-off-by: Benjamin Tissoires Signed-off-by: Sasha Levin --- drivers/hid/hid-logitech-hidpp.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c index 199cc256e9d9d..ffd30c7492df8 100644 --- a/drivers/hid/hid-logitech-hidpp.c +++ b/drivers/hid/hid-logitech-hidpp.c @@ -836,13 +836,16 @@ static int hidpp_root_get_feature(struct hidpp_device *hidpp, u16 feature, static int hidpp_root_get_protocol_version(struct hidpp_device *hidpp) { + const u8 ping_byte = 0x5a; + u8 ping_data[3] = { 0, 0, ping_byte }; struct hidpp_report response; int ret; - ret = hidpp_send_fap_command_sync(hidpp, + ret = hidpp_send_rap_command_sync(hidpp, + REPORT_ID_HIDPP_SHORT, HIDPP_PAGE_ROOT_IDX, CMD_ROOT_GET_PROTOCOL_VERSION, - NULL, 0, &response); + ping_data, sizeof(ping_data), &response); if (ret == HIDPP_ERROR_INVALID_SUBID) { hidpp->protocol_major = 1; @@ -862,8 +865,14 @@ static int hidpp_root_get_protocol_version(struct hidpp_device *hidpp) if (ret) return ret; - hidpp->protocol_major = response.fap.params[0]; - hidpp->protocol_minor = response.fap.params[1]; + if (response.rap.params[2] != ping_byte) { + hid_err(hidpp->hid_dev, "%s: ping mismatch 0x%02x != 0x%02x\n", + __func__, response.rap.params[2], ping_byte); + return -EPROTO; + } + + hidpp->protocol_major = response.rap.params[0]; + hidpp->protocol_minor = response.rap.params[1]; return ret; } -- 2.20.1