From patchwork Fri Sep 19 18:27:37 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ulf Hansson X-Patchwork-Id: 4939591 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id DEF7EBEEA5 for ; Fri, 19 Sep 2014 18:31:06 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 6E81F20204 for ; Fri, 19 Sep 2014 18:31:02 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7C1BA20200 for ; Fri, 19 Sep 2014 18:31:01 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XV2vU-0000El-F4; Fri, 19 Sep 2014 18:29:00 +0000 Received: from mail-pa0-f47.google.com ([209.85.220.47]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XV2uw-00080i-1b for linux-arm-kernel@lists.infradead.org; Fri, 19 Sep 2014 18:28:26 +0000 Received: by mail-pa0-f47.google.com with SMTP id et14so597052pad.34 for ; Fri, 19 Sep 2014 11:28:03 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=7eJvWF2YyomBKwUpLJ3gbRvbk3mYMKd5yyKAWO0V/hA=; b=a7Flge0R3nty37c+d/AlP0LMz3VTCU9CBZBfqm0K1A1HjP/ScceN8kbWDBPGkMaoPr XmD1vOskPuBdfhvAR5iNsoFeNy1qVvO7Pr8AL/Bv0RF36gamQLQwUoiGRalbaQMGNMBd oUJpaxhjfzl5SoPUcLDTP2s+1N9q0gOROLrEe69iLhB6TMgAUC/LqgKRHMKwV5Ms4dxq 4AoKlHO0V455JDZcqIu7h4gaTTbcZ5yTL7SHgQrNTWnNvdQvv32p4vTCidbvaG+Mj7O9 GfNdv1g2hy41tdmlMv9tEOsv+JyAs/ch51eyQFxCtezv3cy69DcnWB6Z/qVm1GPYEAkH +8QA== X-Gm-Message-State: ALoCoQmGqsgdyMRLq+QmBGQ1grg1c8yPfJGvgBkzTbECNfZwcgsyigT8kIZ35UlMqqvkmjFIGCOZ X-Received: by 10.66.97.41 with SMTP id dx9mr3974644pab.65.1411151283507; Fri, 19 Sep 2014 11:28:03 -0700 (PDT) Received: from localhost.localdomain ([38.126.120.10]) by mx.google.com with ESMTPSA id ki1sm2495071pdb.59.2014.09.19.11.27.59 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 19 Sep 2014 11:28:02 -0700 (PDT) From: Ulf Hansson To: "Rafael J. Wysocki" , Len Brown , Pavel Machek , Greg Kroah-Hartman , linux-pm@vger.kernel.org Subject: [PATCH v5 04/11] PM / Domains: Add APIs to attach/detach a PM domain for a device Date: Fri, 19 Sep 2014 20:27:37 +0200 Message-Id: <1411151264-16245-5-git-send-email-ulf.hansson@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1411151264-16245-1-git-send-email-ulf.hansson@linaro.org> References: <1411151264-16245-1-git-send-email-ulf.hansson@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140919_112826_150836_8B4C3D67 X-CRM114-Status: GOOD ( 18.42 ) X-Spam-Score: -1.0 (-) Cc: devicetree@vger.kernel.org, Ulf Hansson , Kevin Hilman , Russell King , Philipp Zabel , Geert Uytterhoeven , Wolfram Sang , Stephen Boyd , Linus Walleij , Daniel Lezcano , Magnus Damm , Tomasz Figa , Chris Ball , linux-acpi@vger.kernel.org, Simon Horman , Alan Stern , Mark Brown , Ben Dooks , Kukjin Kim , Dmitry Torokhov , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP To maintain scalability let's add common methods to attach and detach a PM domain for a device, dev_pm_domain_attach|detach(). Typically dev_pm_domain_attach() shall be invoked from subsystem level code at the probe phase to try to attach a device to its PM domain. The reversed actions may be done a the remove phase and then by invoking dev_pm_domain_detach(). When attachment succeeds, the attach function should assign its corresponding detach function to a new ->detach() callback added in the struct dev_pm_domain. Signed-off-by: Ulf Hansson Tested-by: Philipp Zabel Reviewed-by: Kevin Hilman --- drivers/base/power/common.c | 52 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/pm.h | 11 ++++++++++ 2 files changed, 63 insertions(+) diff --git a/drivers/base/power/common.c b/drivers/base/power/common.c index df2e5ee..a0a415d 100644 --- a/drivers/base/power/common.c +++ b/drivers/base/power/common.c @@ -11,6 +11,8 @@ #include #include #include +#include +#include /** * dev_pm_get_subsys_data - Create or refcount power.subsys_data for device. @@ -82,3 +84,53 @@ int dev_pm_put_subsys_data(struct device *dev) return ret; } EXPORT_SYMBOL_GPL(dev_pm_put_subsys_data); + +/** + * dev_pm_domain_attach - Attach a device to its PM domain. + * @dev: Device to attach. + * @power_on: Used to indicate whether we should power on the device. + * + * The @dev may only be attached to a single PM domain. By iterating through + * the available alternatives we try to find a valid PM domain for the device. + * As attachement succeeds, the ->detach() callback in the struct dev_pm_domain + * should be assigned by the corresponding attach function. + * + * This function should typically be invoked from subsystem level code during + * the probe phase. Especially for those that holds devices which requires + * power management through PM domains. + * + * Callers must ensure proper synchronization of this function with power + * management callbacks. + * + * Returns 0 on successfully attached PM domain or negative error code. + */ +int dev_pm_domain_attach(struct device *dev, bool power_on) +{ + int ret; + + ret = acpi_dev_pm_attach(dev, power_on); + if (ret) + ret = genpd_dev_pm_attach(dev); + + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_domain_attach); + +/** + * dev_pm_domain_detach - Detach a device from its PM domain. + * @dev: Device to attach. + * @power_off: Used to indicate whether we should power off the device. + * + * This functions will reverse the actions from dev_pm_domain_attach() and thus + * try to detach the @dev from its PM domain. Typically it should be invoked + * from subsystem level code during the remove phase. + * + * Callers must ensure proper synchronization of this function with power + * management callbacks. + */ +void dev_pm_domain_detach(struct device *dev, bool power_off) +{ + if (dev->pm_domain && dev->pm_domain->detach) + dev->pm_domain->detach(dev, power_off); +} +EXPORT_SYMBOL_GPL(dev_pm_domain_detach); diff --git a/include/linux/pm.h b/include/linux/pm.h index ef4e16f..ff6400d 100644 --- a/include/linux/pm.h +++ b/include/linux/pm.h @@ -622,6 +622,17 @@ struct dev_pm_domain { void (*detach)(struct device *, bool); }; +#ifdef CONFIG_PM +extern int dev_pm_domain_attach(struct device *dev, bool power_on); +extern void dev_pm_domain_detach(struct device *dev, bool power_off); +#else +static inline int dev_pm_domain_attach(struct device *dev, bool power_on) +{ + return -ENODEV; +} +static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {} +#endif + /* * The PM_EVENT_ messages are also used by drivers implementing the legacy * suspend framework, based on the ->suspend() and ->resume() callbacks common