From patchwork Tue Aug 20 14:03:36 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Westerberg X-Patchwork-Id: 268541 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id C25312C00E2 for ; Wed, 21 Aug 2013 00:04:14 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751289Ab3HTODm (ORCPT ); Tue, 20 Aug 2013 10:03:42 -0400 Received: from mga02.intel.com ([134.134.136.20]:16691 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751039Ab3HTODk (ORCPT ); Tue, 20 Aug 2013 10:03:40 -0400 Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga101.jf.intel.com with ESMTP; 20 Aug 2013 07:03:40 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.89,920,1367996400"; d="scan'208";a="365563490" Received: from blue.fi.intel.com ([10.237.72.156]) by orsmga001.jf.intel.com with ESMTP; 20 Aug 2013 07:03:37 -0700 Received: by blue.fi.intel.com (Postfix, from userid 1004) id BA14FE0092; Tue, 20 Aug 2013 17:03:36 +0300 (EEST) From: Mika Westerberg To: linux-i2c@vger.kernel.org Cc: Wolfram Sang , "Rafael J. Wysocki" , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Lv Zheng , Aaron Lu , Mika Westerberg Subject: [RFC PATCH 2/2] i2c: attach/detach I2C client device to the ACPI power domain Date: Tue, 20 Aug 2013 17:03:36 +0300 Message-Id: <1377007416-13851-3-git-send-email-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 1.8.4.rc2 In-Reply-To: <1377007416-13851-1-git-send-email-mika.westerberg@linux.intel.com> References: <1377007416-13851-1-git-send-email-mika.westerberg@linux.intel.com> Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org From: Lv Zheng If the I2C client device is enumerated from ACPI namespace it might have ACPI methods that needs to be called in order to transition the device to a different power states (such as _PSx). Implement this for I2C client devices by checking if the device has an ACPI handle and if that's the case, attach it to the ACPI power domain. In addition we make sure that the device is fully powered when its ->probe() function gets called. For non-ACPI devices this patch is a no-op. Signed-off-by: Lv Zheng Signed-off-by: Mika Westerberg Acked-by: Rafael J. Wysocki --- drivers/i2c/i2c-core.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 8fad5ac..fdf086b 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -257,6 +257,9 @@ static int i2c_device_probe(struct device *dev) /* Make sure the adapter is active */ pm_runtime_get_sync(&client->adapter->dev); + if (ACPI_HANDLE(&client->dev)) + acpi_dev_pm_attach(&client->dev, true); + /* * Enable runtime PM for the client device. If the client wants to * participate on runtime PM it should call pm_runtime_put() in its @@ -278,6 +281,9 @@ static int i2c_device_probe(struct device *dev) pm_runtime_disable(&client->dev); pm_runtime_set_suspended(&client->dev); pm_runtime_put_noidle(&client->dev); + + if (ACPI_HANDLE(&client->dev)) + acpi_dev_pm_detach(&client->dev, true); } pm_runtime_put(&client->adapter->dev); @@ -314,6 +320,9 @@ static int i2c_device_remove(struct device *dev) pm_runtime_set_suspended(&client->dev); pm_runtime_put_noidle(&client->dev); + if (ACPI_HANDLE(&client->dev)) + acpi_dev_pm_detach(&client->dev, true); + pm_runtime_put(&client->adapter->dev); return status; }