Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932424Ab2JDJce (ORCPT ); Thu, 4 Oct 2012 05:32:34 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:45656 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755483Ab2JDJca (ORCPT ); Thu, 4 Oct 2012 05:32:30 -0400 From: Rajagopal Venkat To: myungjoo.ham@samsung.com, mturquette@linaro.org, kyungmin.park@samsung.com, rjw@sisk.pl Cc: patches@linaro.org, linaro-dev@lists.linaro.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Rajagopal Venkat Subject: [PATCH v4 2/3] devfreq: Add suspend and resume apis Date: Thu, 4 Oct 2012 14:58:33 +0530 Message-Id: <1349342914-7095-3-git-send-email-rajagopal.venkat@linaro.org> X-Mailer: git-send-email 1.7.11.3 In-Reply-To: <1349342914-7095-1-git-send-email-rajagopal.venkat@linaro.org> References: <1349342914-7095-1-git-send-email-rajagopal.venkat@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3917 Lines: 123 Add devfreq suspend/resume apis for devfreq users. This patch supports suspend and resume of devfreq load monitoring, required for devices which can idle. Signed-off-by: Rajagopal Venkat Acked-by: MyungJoo Ham --- drivers/devfreq/devfreq.c | 28 ++++++++++++++++++++++++++++ drivers/devfreq/governor.h | 2 ++ drivers/devfreq/governor_simpleondemand.c | 9 +++++++++ include/linux/devfreq.h | 12 ++++++++++++ 4 files changed, 51 insertions(+) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 41a4099..63e075e 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -428,6 +428,34 @@ int devfreq_remove_device(struct devfreq *devfreq) } EXPORT_SYMBOL(devfreq_remove_device); +/** + * devfreq_suspend_device() - Suspend devfreq of a device. + * @devfreq the devfreq instance to be suspended + */ +int devfreq_suspend_device(struct devfreq *devfreq) +{ + if (!devfreq) + return -EINVAL; + + return devfreq->governor->event_handler(devfreq, + DEVFREQ_GOV_SUSPEND, NULL); +} +EXPORT_SYMBOL(devfreq_suspend_device); + +/** + * devfreq_resume_device() - Resume devfreq of a device. + * @devfreq the devfreq instance to be resumed + */ +int devfreq_resume_device(struct devfreq *devfreq) +{ + if (!devfreq) + return -EINVAL; + + return devfreq->governor->event_handler(devfreq, + DEVFREQ_GOV_RESUME, NULL); +} +EXPORT_SYMBOL(devfreq_resume_device); + static ssize_t show_governor(struct device *dev, struct device_attribute *attr, char *buf) { diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h index bb3aff3..26432ac 100644 --- a/drivers/devfreq/governor.h +++ b/drivers/devfreq/governor.h @@ -22,6 +22,8 @@ #define DEVFREQ_GOV_START 0x1 #define DEVFREQ_GOV_STOP 0x2 #define DEVFREQ_GOV_INTERVAL 0x3 +#define DEVFREQ_GOV_SUSPEND 0x4 +#define DEVFREQ_GOV_RESUME 0x5 /* Caution: devfreq->lock must be locked before calling update_devfreq */ extern int update_devfreq(struct devfreq *devfreq); diff --git a/drivers/devfreq/governor_simpleondemand.c b/drivers/devfreq/governor_simpleondemand.c index cf94218..a8ba78c 100644 --- a/drivers/devfreq/governor_simpleondemand.c +++ b/drivers/devfreq/governor_simpleondemand.c @@ -104,6 +104,15 @@ int devfreq_simple_ondemand_handler(struct devfreq *devfreq, case DEVFREQ_GOV_INTERVAL: devfreq_interval_update(devfreq, (unsigned int *)data); break; + + case DEVFREQ_GOV_SUSPEND: + devfreq_monitor_suspend(devfreq); + break; + + case DEVFREQ_GOV_RESUME: + devfreq_monitor_resume(devfreq); + break; + default: break; } diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index 9cdffde..ee243a3 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -158,6 +158,8 @@ extern struct devfreq *devfreq_add_device(struct device *dev, const struct devfreq_governor *governor, void *data); extern int devfreq_remove_device(struct devfreq *devfreq); +extern int devfreq_suspend_device(struct devfreq *devfreq); +extern int devfreq_resume_device(struct devfreq *devfreq); /* Helper functions for devfreq user device driver with OPP. */ extern struct opp *devfreq_recommended_opp(struct device *dev, @@ -211,6 +213,16 @@ static int devfreq_remove_device(struct devfreq *devfreq) return 0; } +static int devfreq_suspend_device(struct devfreq *devfreq) +{ + return 0; +} + +static int devfreq_resume_device(struct devfreq *devfreq) +{ + return 0; +} + static struct opp *devfreq_recommended_opp(struct device *dev, unsigned long *freq, u32 flags) { -- 1.7.11.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/