From patchwork Wed Sep 11 15:32:33 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Westerberg X-Patchwork-Id: 274331 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 4D31D2C028F for ; Thu, 12 Sep 2013 01:36:08 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755048Ab3IKPct (ORCPT ); Wed, 11 Sep 2013 11:32:49 -0400 Received: from mga14.intel.com ([143.182.124.37]:13815 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754780Ab3IKPcs (ORCPT ); Wed, 11 Sep 2013 11:32:48 -0400 Received: from azsmga002.ch.intel.com ([10.2.17.35]) by azsmga102.ch.intel.com with ESMTP; 11 Sep 2013 08:32:46 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.90,885,1371106800"; d="scan'208";a="293584877" Received: from blue.fi.intel.com ([10.237.72.156]) by AZSMGA002.ch.intel.com with ESMTP; 11 Sep 2013 08:32:41 -0700 Received: by blue.fi.intel.com (Postfix, from userid 1004) id D30ECE0092; Wed, 11 Sep 2013 18:32:40 +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 , linux-arm-kernel@lists.infradead.org, Mark Brown , Dmitry Torokhov , Mauro Carvalho Chehab , Samuel Ortiz , Lee Jones , Arnd Bergmann , Greg Kroah-Hartman , Liam Girdwood , Kyungmin Park , Mika Westerberg Subject: [PATCH v2 2/9] i2c: attach/detach I2C client device to the ACPI power domain Date: Wed, 11 Sep 2013 18:32:33 +0300 Message-Id: <1378913560-2752-3-git-send-email-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 1.8.4.rc3 In-Reply-To: <1378913560-2752-1-git-send-email-mika.westerberg@linux.intel.com> References: <1378913560-2752-1-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 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 44374b4..ac4ea1f 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -251,6 +251,9 @@ 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 @@ -268,6 +271,9 @@ 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); @@ -304,6 +310,9 @@ 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; }