From patchwork Mon Sep 9 01:22:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: lizetao X-Patchwork-Id: 13795717 Received: from szxga04-in.huawei.com (szxga04-in.huawei.com [45.249.212.190]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B849BBA42; Mon, 9 Sep 2024 01:14:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.190 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725844467; cv=none; b=uYpVj4CUJJ4l7UC3+QD9Z4BmYwJaQwrRo366LAQt57Kr343ZbgCAdiNHiaP/vPY/+vIj97SeHPBpEGUAvePiLxbJV4KmPBer4WUqgmxwpOjH3absdueZz8sLTw0DGg6m3csoxtZayzd0umWNZWuwPAfSWVml54hyG8KiFzQFyv4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725844467; c=relaxed/simple; bh=wK0YNdrtg68ij9JLDEKdfQf95eHGfo+KduP/pbWdKlk=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=L0hagKugiTtIH/zX3Wir+d5Z7m1AnLrjHCvp3lsSEm5GvBrMDWnNoOuUII4BZodqcu4HhAOi3AujJ2aQEYcLaRGmkazQOgYdsjhE9+BJbWbHlgs2FpIHlZJk92mlodOV4wxpA1SXJ6vDyLvhW1nw5zFUjXX4WYHGk6TlOyOFpfs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.190 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.88.214]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4X283x3LYyz2DbxK; Mon, 9 Sep 2024 09:13:49 +0800 (CST) Received: from kwepemd500012.china.huawei.com (unknown [7.221.188.25]) by mail.maildlp.com (Postfix) with ESMTPS id B12F01A016C; Mon, 9 Sep 2024 09:14:15 +0800 (CST) Received: from huawei.com (10.90.53.73) by kwepemd500012.china.huawei.com (7.221.188.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.34; Mon, 9 Sep 2024 09:14:14 +0800 From: Li Zetao To: , , , , , , , , , , , , , CC: , , , Subject: [PATCH -next v2 01/15] HID: core: Use devm_add_action_or_reset helper to manage hid resources Date: Mon, 9 Sep 2024 09:22:59 +0800 Message-ID: <20240909012313.500341-2-lizetao1@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240909012313.500341-1-lizetao1@huawei.com> References: <20240909012313.500341-1-lizetao1@huawei.com> Precedence: bulk X-Mailing-List: linux-hwmon@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To kwepemd500012.china.huawei.com (7.221.188.25) By adding a custom action to the device, it can bind the hid resource to the hid_device life cycle. The framework automatically close and stop the hid resources before hid_device is released, and the users do not need to pay attention to the timing of hid resource release. Signed-off-by: Li Zetao --- v1 -> v2: Add function usage constraints in comments v1: https://lore.kernel.org/all/cyils23bh4xaiw7bydlpapz4ngqpya3c4kesifrdpnme2t4bib@6elk7u3wvhh2/ drivers/hid/hid-core.c | 44 ++++++++++++++++++++++++++++++++++++++++++ include/linux/hid.h | 2 ++ 2 files changed, 46 insertions(+) diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 30de92d0bf0f..132c81639753 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -2416,6 +2416,50 @@ void hid_hw_close(struct hid_device *hdev) } EXPORT_SYMBOL_GPL(hid_hw_close); +static void hid_hw_close_and_stop(void *data) +{ + struct hid_device *hdev = data; + + hid_hw_close(hdev); + hid_hw_stop(hdev); +} + +/** + * devm_hid_hw_start_and_open - manage hid resources through custom action + * + * @hdev: hid device + * @connect_mask: which outputs to connect, see HID_CONNECT_* + * + * Bind the hid resource to the hid_device life cycle and register + * an action to release the hid resource. The users do not need to + * pay attention to the release of hid. + * + * Some usage constraints of this function: hid_device also needs to be + * allocated through the Devres API, such as devm_kzalloc; hid_hw_stop should + * be followed immediately by hid_hw_close in the remove operation. + */ + +int devm_hid_hw_start_and_open(struct hid_device *hdev, unsigned int connect_mask) +{ + int ret; + + ret = hid_hw_start(hdev, connect_mask); + if (ret) { + hid_err(hdev, "hw start failed with %d\n", ret); + return ret; + } + + ret = hid_hw_open(hdev); + if (ret) { + hid_err(hdev, "hw open failed with %d\n", ret); + hid_hw_stop(hdev); + return ret; + } + + return devm_add_action_or_reset(&hdev->dev, hid_hw_close_and_stop, hdev); +} +EXPORT_SYMBOL_GPL(devm_hid_hw_start_and_open); + /** * hid_hw_request - send report request to device * diff --git a/include/linux/hid.h b/include/linux/hid.h index 121d5b8bc867..0ce217aa5f62 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -1125,6 +1125,8 @@ int __must_check hid_hw_start(struct hid_device *hdev, void hid_hw_stop(struct hid_device *hdev); int __must_check hid_hw_open(struct hid_device *hdev); void hid_hw_close(struct hid_device *hdev); +int __must_check devm_hid_hw_start_and_open(struct hid_device *hdev, + unsigned int connect_mask); void hid_hw_request(struct hid_device *hdev, struct hid_report *report, enum hid_class_request reqtype); int __hid_hw_raw_request(struct hid_device *hdev,