From patchwork Tue Sep 10 10:59:43 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Jacques Hiblot X-Patchwork-Id: 173509 Delivered-To: patch@linaro.org Received: by 2002:a05:6e02:ce:0:0:0:0 with SMTP id r14csp5628744ilq; Tue, 10 Sep 2019 04:00:06 -0700 (PDT) X-Google-Smtp-Source: APXvYqyFwmrvac96CRmKvscqtpnd5cvf3S5gTJ2w4foWtashd71z/tjeMlNa72e+qn7KNk4nMK8Q X-Received: by 2002:aa7:dccb:: with SMTP id w11mr29302750edu.235.1568113206779; Tue, 10 Sep 2019 04:00:06 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1568113206; cv=none; d=google.com; s=arc-20160816; b=i3XOaZ9Nbr/hb/2X326oHg+aVJudqpJZAzpiAXQfUKjfxfK/dcMCl42AOWcy+Lh2pK nekhrv1XSXm9iarKelan/P/ym+mpxOwIrFq9AVvY47KdVj07KvA8AoWsAlvtAZpOOWsB dNt8jWlZ87xWu8DxwH+XhpaHLwtA+y2fq6Sf28036XF3NbEuK777z+5fNCgy3Rh0mhr1 uYn88THYMclzgf+d4ddIH/+s8622ig4aNFqVoQimYxMUXpK04T5rQ/J/sumiSzcXay0Q YeERfsr/pMGxH6gOoEWQHEytGQk/SDHJd7hWhkSc/CPPqZDTriHmzE1lq8BsmHB8TFg7 Y3tQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:dkim-signature; bh=GmpKwYhuK5X7dWJRaRkcMJXDbBVLOuX+foIqgPcfYaQ=; b=rDZ+1REVuX3kntDzZYQwQosNwgrWWsA5VmwlXKx7laJCXa+E7oB6UwOLHX8wTIv+lr hdxAM51Gk4xEVXMwxSk8NjFdrpt1xckAv5XiFlNr2MQdQJgc7JVJD+dLGef3pyhsbZiD 2bc1sFUOEkOytpyqkKK8rqDiJCu/U8DL8Q2zcXiX3QHX0eaTCHVhTiUJxHUzVCvv4Mi7 jNbJcRPxvSBGOAQCf9cchoZp+KzkNnUdACtKzc/YSgzwJ5Q6ugmefjz+GjbtxnlJdlWN 8xz3uOSiloNnApekZE7K/qb+oS0kkFg5MjG8hilsEIPMRltJNNWASwpMbwBCnXvguje8 2z4Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b=GTl7tqKB; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id k53si10818593edb.303.2019.09.10.04.00.06; Tue, 10 Sep 2019 04:00:06 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b=GTl7tqKB; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390672AbfIJLAD (ORCPT + 27 others); Tue, 10 Sep 2019 07:00:03 -0400 Received: from lelv0142.ext.ti.com ([198.47.23.249]:55952 "EHLO lelv0142.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729140AbfIJLAD (ORCPT ); Tue, 10 Sep 2019 07:00:03 -0400 Received: from fllv0035.itg.ti.com ([10.64.41.0]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id x8AAxrvY071827; Tue, 10 Sep 2019 05:59:53 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1568113193; bh=GmpKwYhuK5X7dWJRaRkcMJXDbBVLOuX+foIqgPcfYaQ=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=GTl7tqKBWUTt/YMmhUHbDPNfVGgYS7mGYfMM+DE0S3PsXq9qfwKVMrxMwq9i49UKZ 19oc8mgpKk/f2a03GJlISL75+udY5Vp6/69mVxjZvbAEQR60wfV6RkH6kyNfGnSJJk +rFzJswDlUis/KWsidcSRqVyiMocB3rbGTtm2VHY= Received: from DFLE106.ent.ti.com (dfle106.ent.ti.com [10.64.6.27]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTP id x8AAxr9Z034403; Tue, 10 Sep 2019 05:59:53 -0500 Received: from DFLE108.ent.ti.com (10.64.6.29) by DFLE106.ent.ti.com (10.64.6.27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Tue, 10 Sep 2019 05:59:53 -0500 Received: from fllv0040.itg.ti.com (10.64.41.20) by DFLE108.ent.ti.com (10.64.6.29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Tue, 10 Sep 2019 05:59:53 -0500 Received: from localhost (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0040.itg.ti.com (8.15.2/8.15.2) with ESMTP id x8AAxqrJ054728; Tue, 10 Sep 2019 05:59:52 -0500 From: Jean-Jacques Hiblot To: , , , , , CC: , , , , , Jean-Jacques Hiblot Subject: [PATCH v5 1/4] leds: Add of_led_get() and led_put() Date: Tue, 10 Sep 2019 12:59:43 +0200 Message-ID: <20190910105946.23057-2-jjhiblot@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190910105946.23057-1-jjhiblot@ti.com> References: <20190910105946.23057-1-jjhiblot@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tomi Valkeinen This patch adds basic support for a kernel driver to get a LED device. This will be used by the led-backlight driver. Only OF version is implemented for now, and the behavior is similar to PWM's of_pwm_get() and pwm_put(). Signed-off-by: Tomi Valkeinen Signed-off-by: Jean-Jacques Hiblot Acked-by: Pavel Machek --- drivers/leds/led-class.c | 50 ++++++++++++++++++++++++++++++++++++++++ include/linux/leds.h | 4 ++++ 2 files changed, 54 insertions(+) -- 2.17.1 diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c index 4e2af8df5aa8..eb98bf13e53b 100644 --- a/drivers/leds/led-class.c +++ b/drivers/leds/led-class.c @@ -18,6 +18,7 @@ #include #include #include +#include #include "leds.h" static struct class *leds_class; @@ -213,6 +214,55 @@ static int led_resume(struct device *dev) static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume); +static int led_match_led_node(struct device *led_dev, const void *data) +{ + return led_dev->of_node == data; +} + +/** + * of_led_get() - request a LED device via the LED framework + * @np: device node to get the LED device from + * @index: the index of the LED + * + * Returns the LED device parsed from the phandle specified in the "leds" + * property of a device tree node or a negative error-code on failure. + */ +struct led_classdev *of_led_get(struct device_node *np, int index) +{ + struct device *led_dev; + struct led_classdev *led_cdev; + struct device_node *led_node; + + led_node = of_parse_phandle(np, "leds", index); + if (!led_node) + return ERR_PTR(-ENOENT); + + led_dev = class_find_device(leds_class, NULL, led_node, + led_match_led_node); + of_node_put(led_node); + + if (!led_dev) + return ERR_PTR(-EPROBE_DEFER); + + led_cdev = dev_get_drvdata(led_dev); + + if (!try_module_get(led_cdev->dev->parent->driver->owner)) + return ERR_PTR(-ENODEV); + + return led_cdev; +} +EXPORT_SYMBOL_GPL(of_led_get); + +/** + * led_put() - release a LED device + * @led_cdev: LED device + */ +void led_put(struct led_classdev *led_cdev) +{ + module_put(led_cdev->dev->parent->driver->owner); +} +EXPORT_SYMBOL_GPL(led_put); + static int match_name(struct device *dev, const void *data) { if (!dev_name(dev)) diff --git a/include/linux/leds.h b/include/linux/leds.h index bee8e3f8dddd..0a71c7cdd191 100644 --- a/include/linux/leds.h +++ b/include/linux/leds.h @@ -19,6 +19,7 @@ struct device; struct led_pattern; +struct device_node; /* * LED Core */ @@ -145,6 +146,9 @@ extern void devm_led_classdev_unregister(struct device *parent, extern void led_classdev_suspend(struct led_classdev *led_cdev); extern void led_classdev_resume(struct led_classdev *led_cdev); +extern struct led_classdev *of_led_get(struct device_node *np, int index); +extern void led_put(struct led_classdev *led_cdev); + /** * led_blink_set - set blinking with software fallback * @led_cdev: the LED to start blinking