From patchwork Wed Jul 17 14:15:11 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: 169148 Delivered-To: patch@linaro.org Received: by 2002:a92:4782:0:0:0:0:0 with SMTP id e2csp1028523ilk; Wed, 17 Jul 2019 07:15:30 -0700 (PDT) X-Google-Smtp-Source: APXvYqytI6fK0lcLU0TBIxt0AEK2ajbk1BzhElg5eAR7MH/XKGLmvUkjKjV1CFsU2i0iW2o2JQ12 X-Received: by 2002:a63:e807:: with SMTP id s7mr40028794pgh.194.1563372930498; Wed, 17 Jul 2019 07:15:30 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1563372930; cv=none; d=google.com; s=arc-20160816; b=e/PnZY/X6BzsnJNwgDVhPLHU2NrqTSHAzq9bePZ9GP5sMnDPO964BU2LtAjLMqSxLX 6XKLzto2adi3/5VOVAQw0Ds8QkHcd2aZNnN6VlfEWhqosOdeM+oP8m0VUIv51IUFU9Ha lB9TclCJlMoP5kCtWqCUHoQ86odXIkXVzUs7Y7PNyRZsowUQ2RbngtLddXWdqpY0CPn1 AtMrxhBT7mZRst9x2t/JmxHbng0rrKAPCo68Rs0EugBq8oTksy4UIeN6S8tg95SuYXBS BgJ9lGmniChGg+h2sRm5Kea9y5asEyHeseYcW84nAMfIRKcKDCTgQMQuMRxp1Xg8T83r wtMA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:content-transfer-encoding:cc:list-subscribe :list-help:list-post:list-archive:list-unsubscribe:list-id :precedence:mime-version:references:in-reply-to:message-id:date :subject:to:from:delivered-to; bh=eBxpn3BVZK/jGnM6CL/hhrtn2H8KUUduxmo6TQgsYVE=; b=f+wnhtpHREgFsDb1Zdfil1MwJ0YChiYtiyx6nK2jsNUWmnyQOmgxLf5xQ1pXygyMuC xdmotkMMJhjpygtIx4HyUBcaRclma7GjUkhG1RhgZsNSOOsrvfIEaSEbQkzjcZAhCqrl W/H/qVvnVLOM4w6UB0dMbkkbRTwneBsmTWiOfQP7N2qHX0Mqxf+07foktucfosI/+1ui zDcyubiAfmVJnixLnpNjglq+2MZtM5kHvajv9sruResJ1/gWJfqPOzxLu1k0HK/nH4Xv erShHwIe6swADmoB4pmBRJ68wlIyL/2OoDXZEs+Xa1kFi+edRBfM+/VSnjQZOa9pcb7S fXwg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of dri-devel-bounces@lists.freedesktop.org designates 2610:10:20:722:a800:ff:fe36:1795 as permitted sender) smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org; dmarc=fail (p=QUARANTINE sp=NONE dis=QUARANTINE) header.from=ti.com Return-Path: Received: from gabe.freedesktop.org (gabe.freedesktop.org. [2610:10:20:722:a800:ff:fe36:1795]) by mx.google.com with ESMTPS id m186si10120899pgm.423.2019.07.17.07.15.30 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 17 Jul 2019 07:15:30 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of dri-devel-bounces@lists.freedesktop.org designates 2610:10:20:722:a800:ff:fe36:1795 as permitted sender) client-ip=2610:10:20:722:a800:ff:fe36:1795; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of dri-devel-bounces@lists.freedesktop.org designates 2610:10:20:722:a800:ff:fe36:1795 as permitted sender) smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org; dmarc=fail (p=QUARANTINE sp=NONE dis=QUARANTINE) header.from=ti.com Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C10A16E193; Wed, 17 Jul 2019 14:15:28 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from fllv0015.ext.ti.com (fllv0015.ext.ti.com [198.47.19.141]) by gabe.freedesktop.org (Postfix) with ESMTPS id 50D3989174 for ; Wed, 17 Jul 2019 14:15:26 +0000 (UTC) Received: from fllv0035.itg.ti.com ([10.64.41.0]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id x6HEFKFR067049; Wed, 17 Jul 2019 09:15:20 -0500 Received: from DFLE114.ent.ti.com (dfle114.ent.ti.com [10.64.6.35]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x6HEFK5u116861 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 17 Jul 2019 09:15:20 -0500 Received: from DFLE111.ent.ti.com (10.64.6.32) by DFLE114.ent.ti.com (10.64.6.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Wed, 17 Jul 2019 09:15:20 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DFLE111.ent.ti.com (10.64.6.32) 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; Wed, 17 Jul 2019 09:15:20 -0500 Received: from localhost (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id x6HEFJs2041032; Wed, 17 Jul 2019 09:15:19 -0500 From: Jean-Jacques Hiblot To: , , , , , , Subject: [PATCH v4 1/4] leds: Add of_led_get() and led_put() Date: Wed, 17 Jul 2019 16:15:11 +0200 Message-ID: <20190717141514.21171-2-jjhiblot@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190717141514.21171-1-jjhiblot@ti.com> References: <20190717141514.21171-1-jjhiblot@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1563372920; bh=l2dct/vWgiYofb3iVx+3ZXVfVtqkj9gwW5dzRD/YKdc=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=a+L4uNrASKS/c8EXytXkkxLm/uA3HDC6uXJopAzVuEo1ZWhTpv60E1qZocuPINjqa +W3wipRHJyOpAuykgUpAOvJvFTEOrkRqJan1AiokSBineMG3QgWeD7jlkc71JondvV gQLYPAwwfguwF1i5hCtnmeQcRa6kywc/GtlfCmyk= X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, tomi.valkeinen@ti.com, dmurphy@ti.com, Jean-Jacques Hiblot , linux-leds@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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 --- drivers/leds/led-class.c | 50 ++++++++++++++++++++++++++++++++++++++++ include/linux/leds.h | 4 ++++ 2 files changed, 54 insertions(+) diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c index cadd43c30d50..9f48798a713d 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