From patchwork Fri Jan 27 20:37:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 648334 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8DD16C54EAA for ; Fri, 27 Jan 2023 20:39:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231875AbjA0UjJ (ORCPT ); Fri, 27 Jan 2023 15:39:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229469AbjA0UjI (ORCPT ); Fri, 27 Jan 2023 15:39:08 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DE7B8525E for ; Fri, 27 Jan 2023 12:37:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1674851867; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=FvC+mJVTxeLB/xxKqNlLzusxS+FDnbgqyFtuEzpY61Y=; b=CaYuQ4l/DtHxsSsrF1Scb/tzjBQzaFDrDpTOPcjcBu3pmM91H8Z4i1rZxFY4HdV11g8NnU zSKnj0uHBd9gVDjSnmhJNwHTxjAOSgB5bT5b+ElebB0wDv18KMZls2FS8bkx0G9GJ6Cwh3 Lbylvy8YGgKL9+A6LSImEwrGSWZB3CM= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-441-Cm0Wo-fJPVejEqV3kXS4wA-1; Fri, 27 Jan 2023 15:37:41 -0500 X-MC-Unique: Cm0Wo-fJPVejEqV3kXS4wA-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 6626C88B776; Fri, 27 Jan 2023 20:37:39 +0000 (UTC) Received: from x1.localdomain.com (unknown [10.39.192.53]) by smtp.corp.redhat.com (Postfix) with ESMTP id DF3F0492C14; Fri, 27 Jan 2023 20:37:35 +0000 (UTC) From: Hans de Goede To: Mark Gross , Andy Shevchenko , Linus Walleij , Laurent Pinchart , Daniel Scally , Mauro Carvalho Chehab , Sakari Ailus Cc: Hans de Goede , platform-driver-x86@vger.kernel.org, linux-gpio@vger.kernel.org, Kate Hsuan , Mark Pearson , Andy Yeh , Hao Yao , linux-media@vger.kernel.org Subject: [PATCH v6 1/5] media: v4l2-core: Make the v4l2-core code enable/disable the privacy LED if present Date: Fri, 27 Jan 2023 21:37:25 +0100 Message-Id: <20230127203729.10205-2-hdegoede@redhat.com> In-Reply-To: <20230127203729.10205-1-hdegoede@redhat.com> References: <20230127203729.10205-1-hdegoede@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Make v4l2_async_register_subdev_sensor() try to get a privacy LED associated with the sensor and extend the call_s_stream() wrapper to enable/disable the privacy LED if found. This makes the core handle privacy LED control, rather then having to duplicate this code in all the sensor drivers. Suggested-by: Sakari Ailus Acked-by: Linus Walleij Signed-off-by: Hans de Goede --- Changes in v6: - Add v4l2_subdev_privacy_led_get()/_put() helpers - At least the _put helper is necessary for cleanup on errors later on in v4l2_async_register_subdev_sensor() - This puts all the LED related coded into a single file (v4l2-subdev.c) removing the need to build the async + fwnode code into videodev.ko, so that patch is dropped - Move the (non-error-exit) cleanup from v4l2_subdev_cleanup() to v4l2_async_unregister_subdev() Changes in v4 (requested by Laurent Pinchart): - Move the led_get() call to v4l2_async_register_subdev_sensor() and make errors other then -ENOENT fail the register() call. - Move the led_disable_sysfs() call to be done at led_get() time, instead of only disabling the sysfs interface when the sensor is streaming. --- drivers/media/v4l2-core/v4l2-async.c | 4 ++ drivers/media/v4l2-core/v4l2-fwnode.c | 7 ++++ drivers/media/v4l2-core/v4l2-subdev-priv.h | 14 +++++++ drivers/media/v4l2-core/v4l2-subdev.c | 44 ++++++++++++++++++++++ include/media/v4l2-subdev.h | 3 ++ 5 files changed, 72 insertions(+) create mode 100644 drivers/media/v4l2-core/v4l2-subdev-priv.h diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c index 2f1b718a9189..d7e9ffc7aa23 100644 --- a/drivers/media/v4l2-core/v4l2-async.c +++ b/drivers/media/v4l2-core/v4l2-async.c @@ -24,6 +24,8 @@ #include #include +#include "v4l2-subdev-priv.h" + static int v4l2_async_nf_call_bound(struct v4l2_async_notifier *n, struct v4l2_subdev *subdev, struct v4l2_async_subdev *asd) @@ -822,6 +824,8 @@ void v4l2_async_unregister_subdev(struct v4l2_subdev *sd) if (!sd->async_list.next) return; + v4l2_subdev_put_privacy_led(sd); + mutex_lock(&list_lock); __v4l2_async_nf_unregister(sd->subdev_notifier); diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c index 3d9533c1b202..049c2f2001ea 100644 --- a/drivers/media/v4l2-core/v4l2-fwnode.c +++ b/drivers/media/v4l2-core/v4l2-fwnode.c @@ -28,6 +28,8 @@ #include #include +#include "v4l2-subdev-priv.h" + static const struct v4l2_fwnode_bus_conv { enum v4l2_fwnode_bus_type fwnode_bus_type; enum v4l2_mbus_type mbus_type; @@ -1302,6 +1304,10 @@ int v4l2_async_register_subdev_sensor(struct v4l2_subdev *sd) v4l2_async_nf_init(notifier); + ret = v4l2_subdev_get_privacy_led(sd); + if (ret < 0) + goto out_cleanup; + ret = v4l2_async_nf_parse_fwnode_sensor(sd->dev, notifier); if (ret < 0) goto out_cleanup; @@ -1322,6 +1328,7 @@ int v4l2_async_register_subdev_sensor(struct v4l2_subdev *sd) v4l2_async_nf_unregister(notifier); out_cleanup: + v4l2_subdev_put_privacy_led(sd); v4l2_async_nf_cleanup(notifier); kfree(notifier); diff --git a/drivers/media/v4l2-core/v4l2-subdev-priv.h b/drivers/media/v4l2-core/v4l2-subdev-priv.h new file mode 100644 index 000000000000..52391d6d8ab7 --- /dev/null +++ b/drivers/media/v4l2-core/v4l2-subdev-priv.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * V4L2 sub-device pivate header. + * + * Copyright (C) 2023 Hans de Goede + */ + +#ifndef _V4L2_SUBDEV_PRIV_H_ +#define _V4L2_SUBDEV_PRIV_H_ + +int v4l2_subdev_get_privacy_led(struct v4l2_subdev *sd); +void v4l2_subdev_put_privacy_led(struct v4l2_subdev *sd); + +#endif diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c index 4988a25bd8f4..9fd183628285 100644 --- a/drivers/media/v4l2-core/v4l2-subdev.c +++ b/drivers/media/v4l2-core/v4l2-subdev.c @@ -9,6 +9,7 @@ */ #include +#include #include #include #include @@ -23,6 +24,8 @@ #include #include +#include "v4l2-subdev-priv.h" + #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd) { @@ -322,6 +325,14 @@ static int call_s_stream(struct v4l2_subdev *sd, int enable) { int ret; +#if IS_REACHABLE(CONFIG_LEDS_CLASS) + if (!IS_ERR_OR_NULL(sd->privacy_led)) { + if (enable) + led_set_brightness(sd->privacy_led, sd->privacy_led->max_brightness); + else + led_set_brightness(sd->privacy_led, 0); + } +#endif ret = sd->ops->video->s_stream(sd, enable); if (!enable && ret < 0) { @@ -1090,6 +1101,7 @@ void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops) sd->grp_id = 0; sd->dev_priv = NULL; sd->host_priv = NULL; + sd->privacy_led = NULL; #if defined(CONFIG_MEDIA_CONTROLLER) sd->entity.name = sd->name; sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV; @@ -1105,3 +1117,35 @@ void v4l2_subdev_notify_event(struct v4l2_subdev *sd, v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev); } EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event); + +int v4l2_subdev_get_privacy_led(struct v4l2_subdev *sd) +{ +#if IS_REACHABLE(CONFIG_LEDS_CLASS) + sd->privacy_led = led_get(sd->dev, "privacy-led"); + if (IS_ERR(sd->privacy_led) && PTR_ERR(sd->privacy_led) != -ENOENT) + return dev_err_probe(sd->dev, PTR_ERR(sd->privacy_led), "getting privacy LED\n"); + + if (!IS_ERR_OR_NULL(sd->privacy_led)) { + mutex_lock(&sd->privacy_led->led_access); + led_sysfs_disable(sd->privacy_led); + led_trigger_remove(sd->privacy_led); + led_set_brightness(sd->privacy_led, 0); + mutex_unlock(&sd->privacy_led->led_access); + } +#endif + return 0; +} +EXPORT_SYMBOL_GPL(v4l2_subdev_get_privacy_led); + +void v4l2_subdev_put_privacy_led(struct v4l2_subdev *sd) +{ +#if IS_REACHABLE(CONFIG_LEDS_CLASS) + if (!IS_ERR_OR_NULL(sd->privacy_led)) { + mutex_lock(&sd->privacy_led->led_access); + led_sysfs_enable(sd->privacy_led); + mutex_unlock(&sd->privacy_led->led_access); + led_put(sd->privacy_led); + } +#endif +} +EXPORT_SYMBOL_GPL(v4l2_subdev_put_privacy_led); diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h index b15fa9930f30..0547313f98cc 100644 --- a/include/media/v4l2-subdev.h +++ b/include/media/v4l2-subdev.h @@ -38,6 +38,7 @@ struct v4l2_subdev; struct v4l2_subdev_fh; struct tuner_setup; struct v4l2_mbus_frame_desc; +struct led_classdev; /** * struct v4l2_decode_vbi_line - used to decode_vbi_line @@ -982,6 +983,8 @@ struct v4l2_subdev { * appropriate functions. */ + struct led_classdev *privacy_led; + /* * TODO: active_state should most likely be changed from a pointer to an * embedded field. For the time being it's kept as a pointer to more