From patchwork Fri Jul 16 22:03:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eddie James X-Patchwork-Id: 479384 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 0A0BDC636CB for ; Fri, 16 Jul 2021 22:03:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D58F2613F1 for ; Fri, 16 Jul 2021 22:03:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236255AbhGPWGh (ORCPT ); Fri, 16 Jul 2021 18:06:37 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:15084 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S229951AbhGPWGg (ORCPT ); Fri, 16 Jul 2021 18:06:36 -0400 Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 16GLYRam179658; Fri, 16 Jul 2021 18:03:38 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=F43RN/7tpoWjldr4PC1nPhWbu+H9VTZNHZFKZko+AaE=; b=YYQrnglnp9tNgfXipWg04TSxKPi/dQzzgJq0pqu6MHJK2nwWrolD1VVHfOr9+PWDtzU5 kHlE3bgFvA4JdmlOPUpx/CBLP3aPIHoOh8p4c2bxlRLVJJHCylDvX4zsTtqugFZVpxGZ TulEYmZhhhlNlUsUxqs55kquqaB/OCWy7WSWgm5VAH0y/326qC69Gdb7o7KZi/wp+wxp jO4D1rQ/sAFTE7ICPv3EnW9VvopWgH4AgLyGWxX9hLYz8wYV9/SUfjqRf1lgaQ4/0nCv UfFJ3rkRJ16y5t+8SX1v9+8Iy3y1GBlolk0YwumURLvRefOeAplmanpAx49yXGk+/lGN ag== Received: from ppma02dal.us.ibm.com (a.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.10]) by mx0b-001b2d01.pphosted.com with ESMTP id 39tw2sac6k-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Jul 2021 18:03:37 -0400 Received: from pps.filterd (ppma02dal.us.ibm.com [127.0.0.1]) by ppma02dal.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 16GLwg9R030701; Fri, 16 Jul 2021 22:03:37 GMT Received: from b03cxnp08025.gho.boulder.ibm.com (b03cxnp08025.gho.boulder.ibm.com [9.17.130.17]) by ppma02dal.us.ibm.com with ESMTP id 39qt3f8qqp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Jul 2021 22:03:37 +0000 Received: from b03ledav006.gho.boulder.ibm.com (b03ledav006.gho.boulder.ibm.com [9.17.130.237]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 16GM3ZCI48234758 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 16 Jul 2021 22:03:35 GMT Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C2EFDC605B; Fri, 16 Jul 2021 22:03:35 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 815E6C6061; Fri, 16 Jul 2021 22:03:35 +0000 (GMT) Received: from v0005c16.aus.stglabs.ibm.com (unknown [9.211.92.96]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Fri, 16 Jul 2021 22:03:35 +0000 (GMT) From: Eddie James To: linux-leds@vger.kernel.org Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, robh+dt@kernel.org, pavel@ucw.cz, Eddie James Subject: [PATCH v2 2/7] leds: leds-core: Implement the retain-state-shutdown property Date: Fri, 16 Jul 2021 17:03:26 -0500 Message-Id: <20210716220331.49303-3-eajames@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210716220331.49303-1-eajames@linux.ibm.com> References: <20210716220331.49303-1-eajames@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 34dSnl0KOth7ELwEPk7_sJbPDPoY40v5 X-Proofpoint-ORIG-GUID: 34dSnl0KOth7ELwEPk7_sJbPDPoY40v5 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.790 definitions=2021-07-16_10:2021-07-16,2021-07-16 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 adultscore=0 spamscore=0 bulkscore=0 clxscore=1015 malwarescore=0 mlxscore=0 mlxlogscore=942 lowpriorityscore=0 impostorscore=0 suspectscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2107160136 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Read the retain-state-shutdown device tree property to set the existing LED_RETAIN_AT_SHUTDOWN flag. Then check the flag when unregistering, and if set, don't set the brightness to OFF. This is useful for systems that want to keep the HW state of the LED across reboots. Signed-off-by: Eddie James --- drivers/leds/led-class.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c index f704391d57a8..f4bb02f6e042 100644 --- a/drivers/leds/led-class.c +++ b/drivers/leds/led-class.c @@ -350,10 +350,15 @@ int led_classdev_register_ext(struct device *parent, if (ret < 0) return ret; - if (init_data->fwnode) + if (init_data->fwnode) { fwnode_property_read_string(init_data->fwnode, "linux,default-trigger", &led_cdev->default_trigger); + + if (fwnode_property_present(init_data->fwnode, + "retain-state-shutdown")) + led_cdev->flags |= LED_RETAIN_AT_SHUTDOWN; + } } else { proposed_name = led_cdev->name; } @@ -444,7 +449,8 @@ void led_classdev_unregister(struct led_classdev *led_cdev) /* Stop blinking */ led_stop_software_blink(led_cdev); - led_set_brightness(led_cdev, LED_OFF); + if (!(led_cdev->flags & LED_RETAIN_AT_SHUTDOWN)) + led_set_brightness(led_cdev, LED_OFF); flush_work(&led_cdev->set_brightness_work);