From patchwork Tue Dec 15 15:44:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ricardo Ribalda X-Patchwork-Id: 344703 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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 6E2A3C2BBCA for ; Tue, 15 Dec 2020 15:51:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 49F542255F for ; Tue, 15 Dec 2020 15:51:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730153AbgLOPt3 (ORCPT ); Tue, 15 Dec 2020 10:49:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54266 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730417AbgLOPqg (ORCPT ); Tue, 15 Dec 2020 10:46:36 -0500 Received: from mail-wm1-x342.google.com (mail-wm1-x342.google.com [IPv6:2a00:1450:4864:20::342]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ECB40C0611BB for ; Tue, 15 Dec 2020 07:45:01 -0800 (PST) Received: by mail-wm1-x342.google.com with SMTP id a6so17288475wmc.2 for ; Tue, 15 Dec 2020 07:45:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=/lEo1sURN+Xzzvd/ZdibJhpngvkvztGXIx39CJjBFoo=; b=N9UzK3xRboarfmoaqoKuN1CIM+VKZ9ZePZpeasHhEFgyPQWRM4Xjtr/4TRTbChM3jJ Wb2BiLt5RyraE4BBUj6eeJzykQtPCWy+a6AacaQ/WYFvdjGCPOwaR1FNG69qTW4FDntx JLz+DQDasKgPh2KXjazzu2BDwOViK8y9sCz7g= 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=/lEo1sURN+Xzzvd/ZdibJhpngvkvztGXIx39CJjBFoo=; b=OZfP0nJBCf48ufHuFdBapMSOkdXoCNj6lqgtk1H39SjIIQieZgYvzTTw/oHxv2/N6R yCHGO0hIQVg1aJd27OW2BwRw17oast5VDkIfh//dwSYasWBQeiACqCLIPqkV0iTYJbuh A08LlwEo7SnyMeJroSS2xC2Op7oIb9nbK91E7O5s/koEhUqWV1GDcs3bwfpo8W01lc5l s6V9tXeo5B01M3eGbeyijlhsy3s1Gl+5hMHNpVDNkT0YDg5EVWt6ulvWfrCUU2psvpsS VHd6Jjx6vfaQ30GD2Wq0/LiCAIINoCmnJGsGDQSwmmOHzsmcs0BBJV+bRFk9V1QVWjZp qPHQ== X-Gm-Message-State: AOAM530TyplZzdo98i0nC1nbeJrCZhaaD8ULZslMdTltPFa1Nvf6HSLX /x3EOKUBTfMp8UsvRD8mIoJugA== X-Google-Smtp-Source: ABdhPJxlT0NjD6rKxQ0ZIf3AWp81FVcwSI2XckoVC3uBW/ff0tEOEGmkIaHQxSPpsqrWBwqh7huyaQ== X-Received: by 2002:a1c:2182:: with SMTP id h124mr33366735wmh.25.1608047100650; Tue, 15 Dec 2020 07:45:00 -0800 (PST) Received: from alco.lan ([80.71.134.83]) by smtp.gmail.com with ESMTPSA id 125sm38204141wmc.27.2020.12.15.07.45.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Dec 2020 07:45:00 -0800 (PST) From: Ricardo Ribalda To: Laurent Pinchart , Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Ricardo Ribalda Subject: [PATCH v4 9/9] media: uvcvideo: Implement UVC_QUIRK_PRIVACY_DURING_STREAM Date: Tue, 15 Dec 2020 16:44:39 +0100 Message-Id: <20201215154439.69062-10-ribalda@chromium.org> X-Mailer: git-send-email 2.29.2.684.gfbc64c5ab5-goog In-Reply-To: <20201215154439.69062-1-ribalda@chromium.org> References: <20201215154439.69062-1-ribalda@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Some devices, can only read the privacy_pin if the device is streaming. This patch implement a quirk for such devices, in order to avoid invalid reads and/or spurious events. Signed-off-by: Ricardo Ribalda --- drivers/media/usb/uvc/uvc_driver.c | 97 ++++++++++++++++++++++++++---- drivers/media/usb/uvc/uvc_queue.c | 3 + drivers/media/usb/uvc/uvcvideo.h | 6 ++ 3 files changed, 94 insertions(+), 12 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c index e49491250e87..61313019e226 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -7,6 +7,7 @@ */ #include +#include #include #include #include @@ -1471,13 +1472,39 @@ static int uvc_parse_control(struct uvc_device *dev) return 0; } +static bool uvc_ext_gpio_is_streaming(struct uvc_device *dev) +{ + struct uvc_streaming *streaming; + + list_for_each_entry(streaming, &dev->streams, list) { + if (uvc_queue_streaming(&streaming->queue)) + return true; + } + + return false; +} + +/* Update the cached value and return true if it has changed */ +static bool uvc_gpio_update_value(struct uvc_entity *unit, u8 *new_val) +{ + *new_val = gpiod_get_value(unit->gpio.gpio_privacy); + + return atomic_xchg(&unit->gpio.gpio_privacy_value, *new_val) != + *new_val; +} + static int uvc_gpio_get_cur(struct uvc_device *dev, struct uvc_entity *entity, u8 cs, void *data, u16 size) { if (cs != UVC_CT_PRIVACY_CONTROL || size < 1) return -EINVAL; - *(uint8_t *)data = gpiod_get_value(entity->gpio.gpio_privacy); + if ((dev->quirks & UVC_QUIRK_PRIVACY_DURING_STREAM) && + !uvc_ext_gpio_is_streaming(dev)) + return -EBUSY; + + uvc_gpio_update_value(entity, (uint8_t *)data); + return 0; } @@ -1491,26 +1518,69 @@ static int uvc_gpio_get_info(struct uvc_device *dev, struct uvc_entity *entity, return 0; } -static irqreturn_t uvc_privacy_gpio_irq(int irq, void *data) +static struct uvc_entity *uvc_find_ext_gpio_unit(struct uvc_device *dev) { - struct uvc_device *dev = data; - struct uvc_video_chain *chain; struct uvc_entity *unit; - u8 value; - /* GPIO entities are always on the first chain */ - chain = list_first_entry(&dev->chains, struct uvc_video_chain, list); list_for_each_entry(unit, &dev->entities, list) { - if (UVC_ENTITY_TYPE(unit) != UVC_EXT_GPIO_UNIT) - continue; - value = gpiod_get_value(unit->gpio.gpio_privacy); - uvc_ctrl_status_event(NULL, chain, unit->controls, &value); - return IRQ_HANDLED; + if (UVC_ENTITY_TYPE(unit) == UVC_EXT_GPIO_UNIT) + return unit; } + return unit; +} + +void uvc_privacy_gpio_event(struct uvc_device *dev) +{ + struct uvc_entity *unit; + struct uvc_video_chain *chain; + u8 new_value; + + unit = uvc_find_ext_gpio_unit(dev); + if (WARN_ONCE(!unit, "Unable to find entity ext_gpio_unit")) + return; + + if (!uvc_gpio_update_value(unit, &new_value)) + return; + + /* GPIO entities are always on the first chain */ + chain = list_first_entry(&dev->chains, struct uvc_video_chain, list); + uvc_ctrl_status_event(NULL, chain, unit->controls, &new_value); +} + +static irqreturn_t uvc_privacy_gpio_irq(int irq, void *data) +{ + struct uvc_device *dev = data; + + /* Ignore privacy events during streamoff */ + if (dev->quirks & UVC_QUIRK_PRIVACY_DURING_STREAM) + if (!uvc_ext_gpio_is_streaming(dev)) + return IRQ_HANDLED; + + uvc_privacy_gpio_event(dev); + return IRQ_HANDLED; } +static const struct dmi_system_id privacy_valid_during_streamon[] = { + { + .ident = "HP Elite c1030 Chromebook", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "HP"), + DMI_MATCH(DMI_PRODUCT_NAME, "Jinlon"), + }, + }, + { + .ident = "HP Pro c640 Chromebook", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "HP"), + DMI_MATCH(DMI_PRODUCT_NAME, "Dratini"), + }, + }, + { } /* terminate list */ +}; + + static int uvc_parse_gpio(struct uvc_device *dev) { struct uvc_entity *unit; @@ -1545,6 +1615,9 @@ static int uvc_parse_gpio(struct uvc_device *dev) if (irq == -EPROBE_DEFER) return -EPROBE_DEFER; + if (dmi_check_system(privacy_valid_during_streamon)) + dev->quirks |= UVC_QUIRK_PRIVACY_DURING_STREAM; + if (irq < 0) return 0; diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c index cd60c6c1749e..e800d491303f 100644 --- a/drivers/media/usb/uvc/uvc_queue.c +++ b/drivers/media/usb/uvc/uvc_queue.c @@ -337,9 +337,12 @@ int uvc_dequeue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf, int uvc_queue_streamon(struct uvc_video_queue *queue, enum v4l2_buf_type type) { int ret; + struct uvc_streaming *stream = uvc_queue_to_stream(queue); mutex_lock(&queue->mutex); ret = vb2_streamon(&queue->queue, type); + if (stream->dev->quirks & UVC_QUIRK_PRIVACY_DURING_STREAM) + uvc_privacy_gpio_event(stream->dev); mutex_unlock(&queue->mutex); return ret; diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h index 2b5ba4b02d3a..2a95b3ed3ea8 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -6,6 +6,7 @@ #error "The uvcvideo.h header is deprecated, use linux/uvcvideo.h instead." #endif /* __KERNEL__ */ +#include #include #include #include @@ -209,6 +210,7 @@ #define UVC_QUIRK_RESTORE_CTRLS_ON_INIT 0x00000400 #define UVC_QUIRK_FORCE_Y8 0x00000800 #define UVC_QUIRK_FORCE_BPP 0x00001000 +#define UVC_QUIRK_PRIVACY_DURING_STREAM 0x00002000 /* Format flags */ #define UVC_FMT_FLAG_COMPRESSED 0x00000001 @@ -359,6 +361,7 @@ struct uvc_entity { u8 bControlSize; u8 *bmControls; struct gpio_desc *gpio_privacy; + atomic_t gpio_privacy_value; } gpio; }; @@ -815,6 +818,9 @@ extern const struct v4l2_file_operations uvc_fops; int uvc_mc_register_entities(struct uvc_video_chain *chain); void uvc_mc_cleanup_entity(struct uvc_entity *entity); +/* Privacy gpio */ +void uvc_privacy_gpio_event(struct uvc_device *dev); + /* Video */ int uvc_video_init(struct uvc_streaming *stream); int uvc_video_suspend(struct uvc_streaming *stream);