From patchwork Fri May 25 20:30:43 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 10428455 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 C17A56032C for ; Fri, 25 May 2018 20:31:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B444629772 for ; Fri, 25 May 2018 20:31:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A827D29798; Fri, 25 May 2018 20:31:57 +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 12A7329772 for ; Fri, 25 May 2018 20:31:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030263AbeEYUbj (ORCPT ); Fri, 25 May 2018 16:31:39 -0400 Received: from mail-pf0-f193.google.com ([209.85.192.193]:39405 "EHLO mail-pf0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030301AbeEYUbc (ORCPT ); Fri, 25 May 2018 16:31:32 -0400 Received: by mail-pf0-f193.google.com with SMTP id a22-v6so3082258pfn.6 for ; Fri, 25 May 2018 13:31:32 -0700 (PDT) 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; bh=Uu8VlrkqcJRFyjpMizXRLcvMGqeQIoT7jNVwm4k/Zus=; b=gGLci0zoxdu79X9LUzEA8KB2zB7N9P4dAzwygFk3FGX5mKqvuk9/UItzi+hmOxxzmO Q4XlFq9gnJEOWht80NSUgwu6IQNtK84qTXa9jEQnZYLWWWbI11TUG2XgXmZWFyZ/y4Ds LPqOeONXCXKZ7tn7LA55XWiGUPrJHrA2+5f2NJ/DOzhpc6pkxNIERxhldFivoB5UpYnw Edg8dDQezZ9Lsi2lt84VTkdYIEKZV2US48KmJ+eju7JwV3vc5YLrJf+mWd7YJRYLaMOH M5Tn3MY3+m+JKDHY0G7zOBqvwOHMlzedVD2MmZVvz6yMLGKa298uWnMacqIDR3mNoMeD AnTQ== X-Gm-Message-State: ALKqPwfUQC8sofuTHqnZlxKRRkJ+sx7DfrwJd5Ku+P3rYcM/s2ojsvr9 lAtCv0tyvzSlI03k7VTrPWy1jA== X-Google-Smtp-Source: AB8JxZoGEy63cYxthRtOL3w0xmJank9Nb3AADmbLSpmwpBbA9aOhNZNQsC7MStCt+ZlBmWF4e+QprQ== X-Received: by 2002:a65:51c4:: with SMTP id i4-v6mr3110336pgq.190.1527280291417; Fri, 25 May 2018 13:31:31 -0700 (PDT) Received: from mka.mtv.corp.google.com ([2620:0:1000:1501:8e2d:4727:1211:622]) by smtp.gmail.com with ESMTPSA id p1-v6sm42912360pfp.137.2018.05.25.13.31.29 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 25 May 2018 13:31:30 -0700 (PDT) From: Matthias Kaehlcke To: MyungJoo Ham Cc: Kyungmin Park , Chanwoo Choi , Arnd Bergmann , Greg Kroah-Hartman , Rob Herring , Mark Rutland , linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Brian Norris , Douglas Anderson , Matthias Kaehlcke Subject: [PATCH 11/11] misc/throttler: Add Chrome OS EC throttler Date: Fri, 25 May 2018 13:30:43 -0700 Message-Id: <20180525203043.249193-12-mka@chromium.org> X-Mailer: git-send-email 2.17.0.921.gf22659ad46-goog In-Reply-To: <20180525203043.249193-1-mka@chromium.org> References: <20180525203043.249193-1-mka@chromium.org> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The driver subscribes to throttling events from the Chrome OS embedded controller and enables/disables system throttling based on these events. Signed-off-by: Matthias Kaehlcke Reviewed-by: Enric Balletbo i Serra --- drivers/misc/throttler/Kconfig | 15 +++ drivers/misc/throttler/Makefile | 1 + drivers/misc/throttler/cros_ec_throttler.c | 122 +++++++++++++++++++++ 3 files changed, 138 insertions(+) create mode 100644 drivers/misc/throttler/cros_ec_throttler.c diff --git a/drivers/misc/throttler/Kconfig b/drivers/misc/throttler/Kconfig index ef8388f6bc0a..652b6817b75c 100644 --- a/drivers/misc/throttler/Kconfig +++ b/drivers/misc/throttler/Kconfig @@ -11,3 +11,18 @@ menuconfig THROTTLER Note that you also need a event monitor module usually called *_throttler. +if THROTTLER + +config CROS_EC_THROTTLER + tristate "Throttler event monitor for the Chrome OS Embedded Controller" + default n + depends on MFD_CROS_EC + ---help--- + This driver adds support to throttle the system in reaction to + Chrome OS EC events. + + To compile this driver as a module, choose M here: the + module will be called cros_ec_throttler. + +endif # THROTTLER + diff --git a/drivers/misc/throttler/Makefile b/drivers/misc/throttler/Makefile index c8d920cee315..d9b2a77dabc9 100644 --- a/drivers/misc/throttler/Makefile +++ b/drivers/misc/throttler/Makefile @@ -1 +1,2 @@ obj-$(CONFIG_THROTTLER) += core.o +obj-$(CONFIG_CROS_EC_THROTTLER) += cros_ec_throttler.o diff --git a/drivers/misc/throttler/cros_ec_throttler.c b/drivers/misc/throttler/cros_ec_throttler.c new file mode 100644 index 000000000000..ea6bc002d49c --- /dev/null +++ b/drivers/misc/throttler/cros_ec_throttler.c @@ -0,0 +1,122 @@ +/* + * Driver for throttling triggered by EC events. + * + * Copyright (C) 2018 Google, Inc. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +struct cros_ec_throttler { + struct cros_ec_device *ec; + struct throttler *throttler; + struct notifier_block nb; +}; + +static int cros_ec_throttler_event(struct notifier_block *nb, + unsigned long queued_during_suspend, void *_notify) +{ + struct cros_ec_throttler *cte = + container_of(nb, struct cros_ec_throttler, nb); + u32 host_event; + + host_event = cros_ec_get_host_event(cte->ec); + if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_THROTTLE_START)) { + throttler_set_level(cte->throttler, 1); + + return NOTIFY_OK; + } else if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_THROTTLE_STOP)) { + throttler_set_level(cte->throttler, 0); + + return NOTIFY_OK; + } + + return NOTIFY_DONE; +} + +static int cros_ec_throttler_probe(struct platform_device *pdev) +{ + struct cros_ec_throttler *cte; + struct device *dev = &pdev->dev; + struct device_node *np = pdev->dev.of_node; + int ret; + + if (!np) { + /* should never happen */ + return -EINVAL; + } + + cte = devm_kzalloc(dev, sizeof(*cte), GFP_KERNEL); + if (!cte) + return -ENOMEM; + + cte->ec = dev_get_drvdata(pdev->dev.parent); + + cte->throttler = throttler_setup(dev); + if (IS_ERR(cte->throttler)) + return PTR_ERR(cte->throttler); + + dev_set_drvdata(dev, cte); + + cte->nb.notifier_call = cros_ec_throttler_event; + ret = blocking_notifier_chain_register(&cte->ec->event_notifier, + &cte->nb); + if (ret < 0) { + dev_err(dev, "failed to register notifier\n"); + throttler_teardown(cte->throttler); + return ret; + } + + return 0; +} + +static int cros_ec_throttler_remove(struct platform_device *pdev) +{ + struct cros_ec_throttler *cte = platform_get_drvdata(pdev); + + blocking_notifier_chain_unregister(&cte->ec->event_notifier, + &cte->nb); + + throttler_teardown(cte->throttler); + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id cros_ec_throttler_of_match[] = { + { .compatible = "google,cros-ec-throttler" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, cros_ec_throttler_of_match); +#endif /* CONFIG_OF */ + +static struct platform_driver cros_ec_throttler_driver = { + .driver = { + .name = "cros-ec-throttler", + .of_match_table = of_match_ptr(cros_ec_throttler_of_match), + }, + .probe = cros_ec_throttler_probe, + .remove = cros_ec_throttler_remove, +}; + +module_platform_driver(cros_ec_throttler_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Matthias Kaehlcke "); +MODULE_DESCRIPTION("Chrome OS EC Throttler");