From patchwork Sun Sep 22 17:50:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gwendal Grignou X-Patchwork-Id: 11155945 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6B8D2112B for ; Sun, 22 Sep 2019 17:52:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3FDB3206C2 for ; Sun, 22 Sep 2019 17:52:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="Www/SClD" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388257AbfIVRwE (ORCPT ); Sun, 22 Sep 2019 13:52:04 -0400 Received: from mail-pg1-f194.google.com ([209.85.215.194]:35506 "EHLO mail-pg1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388217AbfIVRvF (ORCPT ); Sun, 22 Sep 2019 13:51:05 -0400 Received: by mail-pg1-f194.google.com with SMTP id a24so6571505pgj.2 for ; Sun, 22 Sep 2019 10:51:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=+zgK+hVPirfN9H5KHkDj/S/4KoA7AmqlWywx7NCv8Zo=; b=Www/SClDmYml8y5bs9EsBchYqqF7LmSenvTIkZpgjVkmujSdj1t0TeJmM+5YIKU87P IdjD+DvCfFj3BXBLHSX7jRJ7nECeV/JtWOowXo0wp1xjV2Uxlh7aCn7hlmHcUdFmmCqR tqpws8H+SiP2Oa+a/SM6f5FMb//50sDAdXQSE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=+zgK+hVPirfN9H5KHkDj/S/4KoA7AmqlWywx7NCv8Zo=; b=Zwy9vWqAXV/4y+PfHx6aXyGkBUGJLEWwUaKxa/0FYs2gkj2Y9frsbXIQotUdNAHf8c UdV8QaHoaKzoBJK3dUEEBgpLxoRxaeB68WJZtNHfMdMjkuUZBfF3c07tC8g1LQpqHHjG XNpnptSz5hGlRncAARgrx8hvRUZSDdDkOlNlH9JFc4iULMvzjk1+NypNzBfLjSbiMC7u c+xnBF1zERawvOAH5PvU6cN+8jzwXxNMC2SPKc3vrk+3ZBfuedK3Zi93whxMcQYEN10/ lNbqAqQF/Oztr/Ijv0hDQ6HQ7D6vxHzYZNpUxsZz/QLHHiKLh1SM6ncytDHsVqz2bvaM JNJA== X-Gm-Message-State: APjAAAWUU1PXnNDcEePScbmCcGGhyg4Xoq++YZqWV5USa48Sk89t5I6h OTVdAiLGfliIKrcsjmd6d/XYCw== X-Google-Smtp-Source: APXvYqxTclIzIUQ/7AGXk60EER0+9A2qrTaESxBwMR5TDKhSAjMeEEuIWavtHQj9C5Vcr08VFtbtnw== X-Received: by 2002:a63:285:: with SMTP id 127mr25625535pgc.56.1569174662880; Sun, 22 Sep 2019 10:51:02 -0700 (PDT) Received: from localhost ([2620:15c:202:1:3c8f:512b:3522:dfaf]) by smtp.gmail.com with ESMTPSA id y4sm7557255pjn.19.2019.09.22.10.51.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 22 Sep 2019 10:51:02 -0700 (PDT) From: Gwendal Grignou To: jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, lee.jones@linaro.org, bleung@chromium.org, enric.balletbo@collabora.com, dianders@chromium.org, groeck@chromium.org, fabien.lahoudere@collabora.com Cc: linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, Gwendal Grignou Subject: [PATCH 01/13] mfd: cros_ec: Add sensor_count and make check_features public Date: Sun, 22 Sep 2019 10:50:09 -0700 Message-Id: <20190922175021.53449-2-gwendal@chromium.org> X-Mailer: git-send-email 2.23.0.351.gc4317032e6-goog In-Reply-To: <20190922175021.53449-1-gwendal@chromium.org> References: <20190922175021.53449-1-gwendal@chromium.org> MIME-Version: 1.0 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Add a new function to return the number of MEMS sensors available in a ChromeOS Embedded Controller. It uses MOTIONSENSE_CMD_DUMP if available or a specific memory map ACPI registers to find out. Also, make check_features public as it can be useful for other drivers to know whant the Embedded Controller supports. Signed-off-by: Gwendal Grignou --- drivers/mfd/cros_ec_dev.c | 61 ++++++++++++++++++++++++++++++++++++- include/linux/mfd/cros_ec.h | 17 +++++++++++ 2 files changed, 77 insertions(+), 1 deletion(-) diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c index 6e6dfd6c1871..3be80183ccaa 100644 --- a/drivers/mfd/cros_ec_dev.c +++ b/drivers/mfd/cros_ec_dev.c @@ -112,7 +112,7 @@ static const struct mfd_cell cros_ec_vbc_cells[] = { { .name = "cros-ec-vbc", } }; -static int cros_ec_check_features(struct cros_ec_dev *ec, int feature) +int cros_ec_check_features(struct cros_ec_dev *ec, int feature) { struct cros_ec_command *msg; int ret; @@ -143,12 +143,71 @@ static int cros_ec_check_features(struct cros_ec_dev *ec, int feature) return ec->features[feature / 32] & EC_FEATURE_MASK_0(feature); } +EXPORT_SYMBOL_GPL(cros_ec_check_features); static void cros_ec_class_release(struct device *dev) { kfree(to_cros_ec_dev(dev)); } +int cros_ec_get_sensor_count(struct cros_ec_dev *ec) +{ + /* + * Issue a command to get the number of sensor reported. + * If not supported, check for legacy mode. + */ + int ret, sensor_count; + struct ec_params_motion_sense *params; + struct ec_response_motion_sense *resp; + struct cros_ec_command *msg; + struct cros_ec_device *ec_dev = ec->ec_dev; + u8 status; + + msg = kzalloc(sizeof(struct cros_ec_command) + + max(sizeof(*params), sizeof(*resp)), GFP_KERNEL); + if (msg == NULL) + return -ENOMEM; + + msg->version = 1; + msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; + msg->outsize = sizeof(*params); + msg->insize = sizeof(*resp); + + params = (struct ec_params_motion_sense *)msg->data; + params->cmd = MOTIONSENSE_CMD_DUMP; + + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); + if (ret < 0) { + sensor_count = ret; + } else if (msg->result != EC_RES_SUCCESS) { + sensor_count = -EPROTO; + } else { + resp = (struct ec_response_motion_sense *)msg->data; + sensor_count = resp->dump.sensor_count; + } + kfree(msg); + + /* + * Check legacy mode: Let's find out if sensors are accessible + * via LPC interface. + */ + if (sensor_count == -EPROTO && + ec->cmd_offset == 0 && + ec_dev->cmd_readmem) { + ret = ec_dev->cmd_readmem(ec_dev, EC_MEMMAP_ACC_STATUS, + 1, &status); + if ((ret >= 0) && + (status & EC_MEMMAP_ACC_STATUS_PRESENCE_BIT)) { + /* + * We have 2 sensors, one in the lid, one in the base. + */ + sensor_count = 2; + } + } + return sensor_count; +} +EXPORT_SYMBOL_GPL(cros_ec_get_sensor_count); + static void cros_ec_sensors_register(struct cros_ec_dev *ec) { /* diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h index 61c2875c2a40..578e0bbcafdc 100644 --- a/include/linux/mfd/cros_ec.h +++ b/include/linux/mfd/cros_ec.h @@ -32,4 +32,21 @@ struct cros_ec_dev { #define to_cros_ec_dev(dev) container_of(dev, struct cros_ec_dev, class_dev) +/** + * cros_ec_check_features - Test for the presence of EC features + * + * Call this function to test whether the ChromeOS EC supports a feature. + * + * @ec_dev: EC device + * @msg: One of ec_feature_code values + * @return: 1 if supported, 0 if not + */ +int cros_ec_check_features(struct cros_ec_dev *ec, int feature); + +/* + * Return the number of MEMS sensors supported. + * Return < 0 in case of error. + */ +int cros_ec_get_sensor_count(struct cros_ec_dev *ec); + #endif /* __LINUX_MFD_CROS_EC_H */