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=-13.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,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 A66E1C4338F for ; Thu, 19 Aug 2021 02:56:49 +0000 (UTC) Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 561986109F for ; Thu, 19 Aug 2021 02:56:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 561986109F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernelnewbies.org Received: from localhost ([::1] helo=shelob.surriel.com) by shelob.surriel.com with esmtp (Exim 4.94.2) (envelope-from ) id 1mGYEN-0000Ro-CY; Wed, 18 Aug 2021 22:56:35 -0400 Received: from mail-ot1-x335.google.com ([2607:f8b0:4864:20::335]) by shelob.surriel.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94.2) (envelope-from ) id 1mGY9C-0005Sq-7z for kernelnewbies@kernelnewbies.org; Wed, 18 Aug 2021 22:51:14 -0400 Received: by mail-ot1-x335.google.com with SMTP id c19-20020a9d6153000000b0051829acbfc7so6832054otk.9 for ; Wed, 18 Aug 2021 19:51:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=IJR4ds+4+CeZ2VdvpA3rZh2hvpwHhN5sNDRM77ik75U=; b=SCTmfsSZXysNoVTmaqAaFscvgDU8pv6pdPdLRa1C1TcmqL5ah4cnY5ATsXtLecNeUo V/bM2E2jPLwBAtezc22JOg9o0sMDAVLqw1kkUw6WZxKnPHl5WXp1KXSdR8fWDwLUtV61 ClElyUvIWS3uyHNX8nK9j2bQSw0rxM0XuPS7lf8vWl9aPTzN6v5RXL5G7ulgoQeLWEte NthgHKrdFNdVKV9aAsOrfInsDhYRZWmGALekD695eJ0CCa34T4jFhzP86cmVMWrHyaHP nqqWEqmV2K4G8qIBW/LHti+sAPp+4LZzeDydwVFpz3t10EN6QAdcT83waSDLUrc0UaSS RYwg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=IJR4ds+4+CeZ2VdvpA3rZh2hvpwHhN5sNDRM77ik75U=; b=dMlIJe8rcxp2GQdKXK5n2VjWH41Bp5KXhLt8idnjLzmZpTlR14WtuoQeCHhQdj1RX4 VzM4hhdllqBKzGbin09SHnlphCOB0u6UYPntki79lOUOMlJx7jOMSHfrrLnw8VVvjhQ3 v3dppyERBFQCPz5BNbyjrXuA2u1pODMTl/UfFzGCNqAWxodpqdzOrjS+w4Z9juSW8BXR 59hZpjKNIof1up3JPeyyMbDAO+5zrFMxvliOp5Hm9SpMus1kgXAwuAM8I7wwAkSKl3DT uqtYe+Sta7yBG6Cfr4p+oVzgqxd9tEQCYFN0TxX39gCszRg9C/kgCjVgK9AndVUBkYI8 Piqg== X-Gm-Message-State: AOAM53020aXLLpfme14PP4bxAKEP88tt3uzA5FDmVbaFCwlPhTOoQw8F vpof83BVfbqYfTAdwUXAM8WKMK5NUf5p5+F1 X-Google-Smtp-Source: ABdhPJzJzDp/zt8Lm9O57CeptXC+XBKQvnaQoxwF6kT5SljYeFYLRDQSPcZwZNJg9whgu9k3FuN++Q== X-Received: by 2002:a05:6830:411a:: with SMTP id w26mr9765377ott.127.1629341473048; Wed, 18 Aug 2021 19:51:13 -0700 (PDT) Received: from ian.penurio.us ([47.184.51.90]) by smtp.gmail.com with ESMTPSA id w15sm156792oiw.19.2021.08.18.19.51.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 19:51:12 -0700 (PDT) From: Ian Pilcher To: linux-block@vger.kernel.org, linux-leds@vger.kernel.org Subject: [RFC PATCH v3 12/18] ledtrig-blkdev: Add sysfs attributes to [dis]associate LEDs & devices Date: Wed, 18 Aug 2021 21:50:47 -0500 Message-Id: <20210819025053.222710-13-arequipeno@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210819025053.222710-1-arequipeno@gmail.com> References: <20210819025053.222710-1-arequipeno@gmail.com> MIME-Version: 1.0 Cc: axboe@kernel.dk, kabel@kernel.org, linux-kernel@vger.kernel.org, pavel@ucw.cz, kernelnewbies@kernelnewbies.org X-BeenThere: kernelnewbies@kernelnewbies.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Learn about the Linux kernel List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kernelnewbies-bounces@kernelnewbies.org /sys/class/leds//add_blkdev - to create device/LED associations /sys/class/leds//delete_blkdev to remove device/LED associations For both attributes, accept multiple device names separated by whitespace Signed-off-by: Ian Pilcher --- drivers/leds/trigger/ledtrig-blkdev.c | 48 +++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/drivers/leds/trigger/ledtrig-blkdev.c b/drivers/leds/trigger/ledtrig-blkdev.c index a1646752b9a0..15b15aefdfd8 100644 --- a/drivers/leds/trigger/ledtrig-blkdev.c +++ b/drivers/leds/trigger/ledtrig-blkdev.c @@ -480,3 +480,51 @@ static int blkdev_disk_add(struct ledtrig_blkdev_led *const led, exit_return: return ret; } + + +/* + * + * sysfs attributes to add & delete devices from LEDs + * + */ + +static ssize_t blkdev_add_or_del(struct device *const dev, + struct device_attribute *const attr, + const char *const buf, const size_t count); + +static struct device_attribute ledtrig_blkdev_attr_add = + __ATTR(add_blkdev, 0200, NULL, blkdev_add_or_del); + +static struct device_attribute ledtrig_blkdev_attr_del = + __ATTR(delete_blkdev, 0200, NULL, blkdev_add_or_del); + +static ssize_t blkdev_add_or_del(struct device *const dev, + struct device_attribute *const attr, + const char *const buf, const size_t count) +{ + struct ledtrig_blkdev_led *const led = led_trigger_get_drvdata(dev); + const char *const disk_name = blkdev_skip_space(buf); + const char *const endp = blkdev_find_space(disk_name); + const ptrdiff_t name_len = endp - disk_name; /* always >= 0 */ + int ret; + + if (name_len == 0) { + pr_info("blkdev LED: empty block device name\n"); + return -EINVAL; + } + + if (attr == &ledtrig_blkdev_attr_del) { + blkdev_disk_delete(led, disk_name, name_len); + } else { /* attr == &ledtrig_blkdev_attr_add */ + ret = blkdev_disk_add(led, disk_name, name_len); + if (ret != 0) + return ret; + } + + /* + * Consume everything up to the next non-whitespace token (or the end + * of the input). Avoids "empty block device name" error if there is + * whitespace after the last token (e.g. a newline). + */ + return blkdev_skip_space(endp) - buf; +} -- 2.31.1 _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies