From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 47676C7618B for ; Wed, 24 Jul 2019 07:45:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 225A92199C for ; Wed, 24 Jul 2019 07:45:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725909AbfGXHpP (ORCPT ); Wed, 24 Jul 2019 03:45:15 -0400 Received: from inva020.nxp.com ([92.121.34.13]:43238 "EHLO inva020.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725776AbfGXHpP (ORCPT ); Wed, 24 Jul 2019 03:45:15 -0400 Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 948ED1A0337; Wed, 24 Jul 2019 09:45:12 +0200 (CEST) Received: from invc005.ap-rdc01.nxp.com (invc005.ap-rdc01.nxp.com [165.114.16.14]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 4B3C51A037B; Wed, 24 Jul 2019 09:45:05 +0200 (CEST) Received: from localhost.localdomain (mega.ap.freescale.net [10.192.208.232]) by invc005.ap-rdc01.nxp.com (Postfix) with ESMTP id 7D743402F6; Wed, 24 Jul 2019 15:44:56 +0800 (SGT) From: Ran Wang To: Li Yang , Rob Herring , Mark Rutland , Pavel Machek Cc: "Rafael J . Wysocki" , Li Biwen , Len Brown , Greg Kroah-Hartman , linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Ran Wang Subject: [PATCH v5 1/3] PM: wakeup: Add routine to help fetch wakeup source object. Date: Wed, 24 Jul 2019 15:47:20 +0800 Message-Id: <20190724074722.12270-1-ran.wang_1@nxp.com> X-Mailer: git-send-email 2.17.1 X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Some user might want to go through all registered wakeup sources and doing things accordingly. For example, SoC PM driver might need to do HW programming to prevent powering down specific IP which wakeup source depending on. So add this API to help walk through all registered wakeup source objects on that list and return them one by one. Signed-off-by: Ran Wang --- Change in v5: - Update commit message, add decription of walk through all wakeup source objects. - Add SCU protection in function wakeup_source_get_next(). - Rename wakeup_source member 'attached_dev' to 'dev' and move it up (before wakeirq). Change in v4: - None. Change in v3: - Adjust indentation of *attached_dev;. Change in v2: - None. drivers/base/power/wakeup.c | 24 ++++++++++++++++++++++++ include/linux/pm_wakeup.h | 3 +++ 2 files changed, 27 insertions(+) diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c index ee31d4f..2fba891 100644 --- a/drivers/base/power/wakeup.c +++ b/drivers/base/power/wakeup.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -226,6 +227,28 @@ void wakeup_source_unregister(struct wakeup_source *ws) } } EXPORT_SYMBOL_GPL(wakeup_source_unregister); +/** + * wakeup_source_get_next - Get next wakeup source from the list + * @ws: Previous wakeup source object, null means caller want first one. + */ +struct wakeup_source *wakeup_source_get_next(struct wakeup_source *ws) +{ + struct list_head *ws_head = &wakeup_sources; + struct wakeup_source *next_ws = NULL; + int idx; + + idx = srcu_read_lock(&wakeup_srcu); + if (ws) + next_ws = list_next_or_null_rcu(ws_head, &ws->entry, + struct wakeup_source, entry); + else + next_ws = list_entry_rcu(ws_head->next, + struct wakeup_source, entry); + srcu_read_unlock(&wakeup_srcu, idx); + + return next_ws; +} +EXPORT_SYMBOL_GPL(wakeup_source_get_next); /** * device_wakeup_attach - Attach a wakeup source object to a device object. @@ -242,6 +265,7 @@ static int device_wakeup_attach(struct device *dev, struct wakeup_source *ws) return -EEXIST; } dev->power.wakeup = ws; + ws->dev = dev; if (dev->power.wakeirq) device_wakeup_attach_irq(dev, dev->power.wakeirq); spin_unlock_irq(&dev->power.lock); diff --git a/include/linux/pm_wakeup.h b/include/linux/pm_wakeup.h index 9102760..fc23c1a 100644 --- a/include/linux/pm_wakeup.h +++ b/include/linux/pm_wakeup.h @@ -23,6 +23,7 @@ struct wake_irq; * @name: Name of the wakeup source * @entry: Wakeup source list entry * @lock: Wakeup source lock + * @dev: The device it attached to * @wakeirq: Optional device specific wakeirq * @timer: Wakeup timer list * @timer_expires: Wakeup timer expiration @@ -42,6 +43,7 @@ struct wakeup_source { const char *name; struct list_head entry; spinlock_t lock; + struct device *dev; struct wake_irq *wakeirq; struct timer_list timer; unsigned long timer_expires; @@ -88,6 +90,7 @@ extern void wakeup_source_add(struct wakeup_source *ws); extern void wakeup_source_remove(struct wakeup_source *ws); extern struct wakeup_source *wakeup_source_register(const char *name); extern void wakeup_source_unregister(struct wakeup_source *ws); +extern struct wakeup_source *wakeup_source_get_next(struct wakeup_source *ws); extern int device_wakeup_enable(struct device *dev); extern int device_wakeup_disable(struct device *dev); extern void device_set_wakeup_capable(struct device *dev, bool capable); -- 2.7.4