From patchwork Thu Aug 6 15:33:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guenter Roeck X-Patchwork-Id: 1341795 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=roeck-us.net Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=HKa7pqON; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4BMvdx4mp3z9sSG for ; Fri, 7 Aug 2020 02:51:33 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729507AbgHFQvc (ORCPT ); Thu, 6 Aug 2020 12:51:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43402 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729491AbgHFQvB (ORCPT ); Thu, 6 Aug 2020 12:51:01 -0400 Received: from mail-pj1-x1042.google.com (mail-pj1-x1042.google.com [IPv6:2607:f8b0:4864:20::1042]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 38C18C0086B5; Thu, 6 Aug 2020 08:33:21 -0700 (PDT) Received: by mail-pj1-x1042.google.com with SMTP id l60so6885280pjb.3; Thu, 06 Aug 2020 08:33:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=WjNGcySxRcaRcYcgPeVnxcihqjmgxQQKoyRxNRcejbY=; b=HKa7pqONCRww+Pym08+/wilDVmxt8tFBK3SU1VngGvM2DtkUaCMf+tVVr+JF2AfGIV JEP+aewH66rxzRomgohQzNlUClubnE1zNvjviZaf7wmNTEx+sXwPdo+5b9OjN+VlT9/4 CWVUn/AHhlr3GsdD387h7ffAKwBFeh3nlq7WepukH2iZIBWIZ8B06smfNCYXmPYIo66/ 9gtymJbAptkIhXR7KUJOUxXzUTEjZbWRZ+dAYDWsYDwH83MPOYxqZMhVnltXTlU/Xk3n Vt84AEX8hJkv/UptQ88VL/GJQrTasMuIN1iI35WO0QZ+0Vbp0/75FQ75vj4peOrlQ+P5 LwmQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references; bh=WjNGcySxRcaRcYcgPeVnxcihqjmgxQQKoyRxNRcejbY=; b=gpXMK1e+i4PTjsWydhP2BugWoIyq1pd4+XNT/GX2WP3HR0gqFIytfR3eDYgdgLBQrc 5A39GajaWMvy+Xn4gt8VvHRYEsCq/itLJs/DwuWpLfl4vjRLNqrf6iVSe44YDQelM8f5 o9cWcHPx34h/oNieQgZiScRfctOcYKWWndQJiWcWgmXyas1zcqd8X3RpjNgS1UkF9Yaj AvCCVynJHHjecQtLfyTuP0UdpprvBgjugmoCqPTQkG/WQSQkj56gcjVw1/UFTj8FRTbQ ciOQm3vfWZBJp2oJYi7F2fsCVssi7bhQtcoMGzd+REAzTmXxTcIT90Yfj1shAVjCWhRT O+aw== X-Gm-Message-State: AOAM530DB9I1hgsbDhZcJUAyZ9+QwMh0Xrtv1LSc6pL2+jqxXW7lSNxl SmiEE+8Mlzkd8b1VRAtq55Q= X-Google-Smtp-Source: ABdhPJyAk+h5y35gNsqwwwFGNm8e3OHM/Chrw1Kie32e0jvdY0BXQJ9AbnDAsazimg4SL9OE7qshuw== X-Received: by 2002:a17:902:b20e:: with SMTP id t14mr8675313plr.58.1596728000737; Thu, 06 Aug 2020 08:33:20 -0700 (PDT) Received: from localhost ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id 27sm7471068pgk.89.2020.08.06.08.33.20 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Thu, 06 Aug 2020 08:33:20 -0700 (PDT) From: Guenter Roeck To: Enric Balletbo i Serra Cc: Jonathan Cameron , Benson Leung , Dmitry Torokhov , Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Lee Jones , Gwendal Grignou , Brian Norris , Yu-Hsuan Hsu , Prashant Malani , linux-iio@vger.kernel.org, linux-input@vger.kernel.org, linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org, Guenter Roeck Subject: [PATCH v4 6/7] platform/chrome: cros_ec_proto: Convert EC error codes to Linux error codes Date: Thu, 6 Aug 2020 08:33:07 -0700 Message-Id: <20200806153308.204605-7-linux@roeck-us.net> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200806153308.204605-1-linux@roeck-us.net> References: <20200806153308.204605-1-linux@roeck-us.net> Sender: linux-pwm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org The EC reports a variety of error codes. Most of those, with the exception of EC_RES_INVALID_VERSION, are converted to -EPROTO. As result, the actual EC error code gets lost. Introduce cros_ec_map_error() to map EC error codes to Linux error codes, and use it in cros_ec_cmd_xfer_status() to report more meaningful errors to the caller. With this change, callers of cros_ec_cmd_xfer_status() can implement a more distinguished action without having to rely on the EC error code. At the same time, debugging is improved in situations where the Linux error code is reported to userspace and/or in the kernel log. Cc: Gwendal Grignou Cc: Yu-Hsuan Hsu Cc: Prashant Malani Cc: Brian Norris Reviewed-by: Brian Norris Signed-off-by: Guenter Roeck --- v4: Added Brian's Reviewed-by: tag v3: Use -ENOPROTOOPT for EC_RES_INVALID_VERSION Implement function to convert error codes v2: No change drivers/platform/chrome/cros_ec_proto.c | 52 ++++++++++++++++++++----- 1 file changed, 42 insertions(+), 10 deletions(-) diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index e5bbec979a2a..a081b8245682 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -15,6 +15,43 @@ #define EC_COMMAND_RETRIES 50 +static const int cros_ec_error_map[] = { + [EC_RES_INVALID_COMMAND] = -EOPNOTSUPP, + [EC_RES_ERROR] = -EIO, + [EC_RES_INVALID_PARAM] = -EINVAL, + [EC_RES_ACCESS_DENIED] = -EACCES, + [EC_RES_INVALID_RESPONSE] = -EPROTO, + [EC_RES_INVALID_VERSION] = -ENOPROTOOPT, + [EC_RES_INVALID_CHECKSUM] = -EBADMSG, + [EC_RES_IN_PROGRESS] = -EINPROGRESS, + [EC_RES_UNAVAILABLE] = -ENODATA, + [EC_RES_TIMEOUT] = -ETIMEDOUT, + [EC_RES_OVERFLOW] = -EOVERFLOW, + [EC_RES_INVALID_HEADER] = -EBADR, + [EC_RES_REQUEST_TRUNCATED] = -EBADR, + [EC_RES_RESPONSE_TOO_BIG] = -EFBIG, + [EC_RES_BUS_ERROR] = -EFAULT, + [EC_RES_BUSY] = -EBUSY, + [EC_RES_INVALID_HEADER_VERSION] = -EBADMSG, + [EC_RES_INVALID_HEADER_CRC] = -EBADMSG, + [EC_RES_INVALID_DATA_CRC] = -EBADMSG, + [EC_RES_DUP_UNAVAILABLE] = -ENODATA, +}; + +static int cros_ec_map_error(uint32_t result) +{ + int ret = 0; + + if (result != EC_RES_SUCCESS) { + if (result < ARRAY_SIZE(cros_ec_error_map) && cros_ec_error_map[result]) + ret = cros_ec_error_map[result]; + else + ret = -EPROTO; + } + + return ret; +} + static int prepare_packet(struct cros_ec_device *ec_dev, struct cros_ec_command *msg) { @@ -555,8 +592,7 @@ EXPORT_SYMBOL(cros_ec_cmd_xfer); * * Return: * >=0 - The number of bytes transferred - * -ENOPROTOOPT - Operation not supported - * -EPROTO - Protocol error + * <0 - Linux error code */ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, struct cros_ec_command *msg) @@ -566,15 +602,11 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, ret = cros_ec_cmd_xfer(ec_dev, msg); if (ret < 0) { dev_err(ec_dev->dev, "Command xfer error (err:%d)\n", ret); - } else if (msg->result == EC_RES_INVALID_VERSION) { - dev_dbg(ec_dev->dev, "Command invalid version (err:%d)\n", - msg->result); - return -ENOPROTOOPT; - } else if (msg->result != EC_RES_SUCCESS) { - dev_dbg(ec_dev->dev, "Command result (err: %d)\n", msg->result); - return -EPROTO; + } else { + ret = cros_ec_map_error(msg->result); + if (ret) + dev_dbg(ec_dev->dev, "Command result (err: %d [%d])\n", msg->result, ret); } - return ret; } EXPORT_SYMBOL(cros_ec_cmd_xfer_status);