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[34.85.216.189]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7b32ac2dcebsm608292285a.7.2024.11.12.09.31.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Nov 2024 09:31:02 -0800 (PST) From: Ricardo Ribalda Date: Tue, 12 Nov 2024 17:30:46 +0000 Subject: [PATCH v3 3/8] media: uvcvideo: Re-implement privacy GPIO as an input device Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241112-uvc-subdev-v3-3-0ea573d41a18@chromium.org> References: <20241112-uvc-subdev-v3-0-0ea573d41a18@chromium.org> In-Reply-To: <20241112-uvc-subdev-v3-0-0ea573d41a18@chromium.org> To: Laurent Pinchart , Mauro Carvalho Chehab , Sakari Ailus Cc: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, Yunke Cao , Hans Verkuil , Hans de Goede , Ricardo Ribalda X-Mailer: b4 0.13.0 Reimplement privacy GPIO as an input device. This is an attempt to unify how we notify userspace about a camera that is covered. Replace the previous V4L2_CID_PRIVACY control with evdev SW_CAMERA_LENS_COVER. This has some main benefits: - It unifies behaviour with other drivers. - It allows reading the privacy events without powering up the camera. - It allows reading the privacy gpio and the internal gpio control (if present). Although this introduces an ABI change, we have only seen ChromeOS using this feature. Signed-off-by: Ricardo Ribalda --- drivers/media/usb/uvc/Kconfig | 2 +- drivers/media/usb/uvc/Makefile | 6 ++- drivers/media/usb/uvc/uvc_ctrl.c | 20 ---------- drivers/media/usb/uvc/uvc_driver.c | 3 +- drivers/media/usb/uvc/uvc_entity.c | 6 +++ drivers/media/usb/uvc/uvc_gpio.c | 76 +++++++++++++------------------------- drivers/media/usb/uvc/uvc_status.c | 13 +++++-- drivers/media/usb/uvc/uvcvideo.h | 15 +++++--- 8 files changed, 59 insertions(+), 82 deletions(-) diff --git a/drivers/media/usb/uvc/Kconfig b/drivers/media/usb/uvc/Kconfig index 579532272fd6..cdbba7fd5bee 100644 --- a/drivers/media/usb/uvc/Kconfig +++ b/drivers/media/usb/uvc/Kconfig @@ -17,6 +17,6 @@ config USB_VIDEO_CLASS_INPUT_EVDEV depends on USB_VIDEO_CLASS=INPUT || INPUT=y help This option makes USB Video Class devices register an input device - to report button events. + to report button events and privacy GPIO. If you are in doubt, say Y. diff --git a/drivers/media/usb/uvc/Makefile b/drivers/media/usb/uvc/Makefile index 85514b6e538f..b36b124da7a8 100644 --- a/drivers/media/usb/uvc/Makefile +++ b/drivers/media/usb/uvc/Makefile @@ -1,8 +1,10 @@ # SPDX-License-Identifier: GPL-2.0 uvcvideo-objs := uvc_driver.o uvc_queue.o uvc_v4l2.o uvc_video.o uvc_ctrl.o \ - uvc_status.o uvc_isight.o uvc_debugfs.o uvc_metadata.o \ - uvc_gpio.o + uvc_status.o uvc_isight.o uvc_debugfs.o uvc_metadata.o ifeq ($(CONFIG_MEDIA_CONTROLLER),y) uvcvideo-objs += uvc_entity.o endif +ifeq ($(CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV),y) +uvcvideo-objs += uvc_gpio.o +endif obj-$(CONFIG_USB_VIDEO_CLASS) += uvcvideo.o diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 4fe26e82e3d1..b98f4778d8aa 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -350,14 +350,6 @@ static const struct uvc_control_info uvc_ctrls[] = { | UVC_CTRL_FLAG_RESTORE | UVC_CTRL_FLAG_AUTO_UPDATE, }, - { - .entity = UVC_GUID_EXT_GPIO_CONTROLLER, - .selector = UVC_CT_PRIVACY_CONTROL, - .index = 0, - .size = 1, - .flags = UVC_CTRL_FLAG_GET_CUR - | UVC_CTRL_FLAG_AUTO_UPDATE, - }, }; static const u32 uvc_control_classes[] = { @@ -827,15 +819,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = { .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, }, - { - .id = V4L2_CID_PRIVACY, - .entity = UVC_GUID_EXT_GPIO_CONTROLLER, - .selector = UVC_CT_PRIVACY_CONTROL, - .size = 1, - .offset = 0, - .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, - .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, - }, { .entity = UVC_GUID_UVC_PROCESSING, .selector = UVC_PU_POWER_LINE_FREQUENCY_CONTROL, @@ -2718,9 +2701,6 @@ static int uvc_ctrl_init_chain(struct uvc_video_chain *chain) } else if (UVC_ENTITY_TYPE(entity) == UVC_ITT_CAMERA) { bmControls = entity->camera.bmControls; bControlSize = entity->camera.bControlSize; - } else if (UVC_ENTITY_TYPE(entity) == UVC_EXT_GPIO_UNIT) { - bmControls = entity->gpio.bmControls; - bControlSize = entity->gpio.bControlSize; } /* Remove bogus/blacklisted controls */ diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c index 5b48768a4f7f..d6c12be49b5c 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -2171,6 +2171,7 @@ static int uvc_probe(struct usb_interface *intf, if (media_device_register(&dev->mdev) < 0) goto error; #endif + /* Save our data pointer in the interface data. */ usb_set_intfdata(intf, dev); @@ -2182,7 +2183,7 @@ static int uvc_probe(struct usb_interface *intf, ret); } - ret = uvc_gpio_init_irq(dev); + ret = uvc_gpio_init(dev); if (ret < 0) { dev_err(&dev->udev->dev, "Unable to request privacy GPIO IRQ (%d)\n", ret); diff --git a/drivers/media/usb/uvc/uvc_entity.c b/drivers/media/usb/uvc/uvc_entity.c index cc68dd24eb42..c1b69f9eaa56 100644 --- a/drivers/media/usb/uvc/uvc_entity.c +++ b/drivers/media/usb/uvc/uvc_entity.c @@ -56,7 +56,13 @@ static int uvc_mc_create_links(struct uvc_video_chain *chain, return 0; } +static const struct v4l2_subdev_core_ops uvc_subdev_core_ops = { + .subscribe_event = v4l2_ctrl_subdev_subscribe_event, + .unsubscribe_event = v4l2_event_subdev_unsubscribe, +}; + static const struct v4l2_subdev_ops uvc_subdev_ops = { + .core = &uvc_subdev_core_ops, }; void uvc_mc_cleanup_entity(struct uvc_entity *entity) diff --git a/drivers/media/usb/uvc/uvc_gpio.c b/drivers/media/usb/uvc/uvc_gpio.c index 453739acbe8f..80096022ad08 100644 --- a/drivers/media/usb/uvc/uvc_gpio.c +++ b/drivers/media/usb/uvc/uvc_gpio.c @@ -7,57 +7,29 @@ #include #include +#include #include "uvcvideo.h" -static void uvc_gpio_event(struct uvc_device *dev) -{ - struct uvc_entity *unit = dev->gpio_unit; - struct uvc_video_chain *chain; - u8 new_val; - - if (!unit) - return; - - new_val = gpiod_get_value_cansleep(unit->gpio.gpio_privacy); - - /* GPIO entities are always on the first chain. */ - chain = list_first_entry(&dev->chains, struct uvc_video_chain, list); - uvc_ctrl_status_event(chain, unit->controls, &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; - - *(u8 *)data = gpiod_get_value_cansleep(entity->gpio.gpio_privacy); - - return 0; -} - -static int uvc_gpio_get_info(struct uvc_device *dev, struct uvc_entity *entity, - u8 cs, u8 *caps) -{ - if (cs != UVC_CT_PRIVACY_CONTROL) - return -EINVAL; - - *caps = UVC_CONTROL_CAP_GET | UVC_CONTROL_CAP_AUTOUPDATE; - return 0; -} - static irqreturn_t uvc_gpio_irq(int irq, void *data) { struct uvc_device *dev = data; + struct uvc_gpio *uvc_gpio = &dev->gpio_unit->gpio; + int new_val; + + new_val = gpiod_get_value_cansleep(uvc_gpio->gpio_privacy); + if (new_val < 0) + return IRQ_HANDLED; + + input_report_switch(dev->input, SW_CAMERA_LENS_COVER, new_val); + input_sync(dev->input); - uvc_gpio_event(dev); return IRQ_HANDLED; } int uvc_gpio_parse(struct uvc_device *dev) { - struct uvc_entity *unit; struct gpio_desc *gpio_privacy; + struct uvc_entity *unit; int irq; gpio_privacy = devm_gpiod_get_optional(&dev->intf->dev, "privacy", @@ -67,23 +39,17 @@ int uvc_gpio_parse(struct uvc_device *dev) irq = gpiod_to_irq(gpio_privacy); if (irq < 0) - return dev_err_probe(&dev->udev->dev, irq, + return dev_err_probe(&dev->intf->dev, irq, "No IRQ for privacy GPIO\n"); unit = uvc_alloc_new_entity(dev, UVC_EXT_GPIO_UNIT, - UVC_EXT_GPIO_UNIT_ID, 0, 1); + UVC_EXT_GPIO_UNIT_ID, 0, 0); if (IS_ERR(unit)) return PTR_ERR(unit); unit->gpio.gpio_privacy = gpio_privacy; unit->gpio.irq = irq; - unit->gpio.bControlSize = 1; - unit->gpio.bmControls = (u8 *)unit + sizeof(*unit); - unit->gpio.bmControls[0] = 1; - unit->get_cur = uvc_gpio_get_cur; - unit->get_info = uvc_gpio_get_info; strscpy(unit->name, "GPIO", sizeof(unit->name)); - list_add_tail(&unit->list, &dev->entities); dev->gpio_unit = unit; @@ -91,22 +57,32 @@ int uvc_gpio_parse(struct uvc_device *dev) return 0; } -int uvc_gpio_init_irq(struct uvc_device *dev) +int uvc_gpio_init(struct uvc_device *dev) { struct uvc_entity *unit = dev->gpio_unit; + int init_val; int ret; if (!unit || unit->gpio.irq < 0) return 0; + init_val = gpiod_get_value_cansleep(unit->gpio.gpio_privacy); + if (init_val < 0) + return init_val; + ret = request_threaded_irq(unit->gpio.irq, NULL, uvc_gpio_irq, IRQF_ONESHOT | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, "uvc_privacy_gpio", dev); + if (ret) + return ret; + + input_report_switch(dev->input, SW_CAMERA_LENS_COVER, init_val); + input_sync(dev->input); - unit->gpio.initialized = !ret; + unit->gpio.initialized = true; - return ret; + return 0; } void uvc_gpio_deinit(struct uvc_device *dev) diff --git a/drivers/media/usb/uvc/uvc_status.c b/drivers/media/usb/uvc/uvc_status.c index 06c867510c8f..319f472213f6 100644 --- a/drivers/media/usb/uvc/uvc_status.c +++ b/drivers/media/usb/uvc/uvc_status.c @@ -44,7 +44,7 @@ static int uvc_input_init(struct uvc_device *dev) struct input_dev *input; int ret; - if (!uvc_input_has_button(dev)) + if (!uvc_input_has_button(dev) && !dev->gpio_unit) return 0; input = input_allocate_device(); @@ -59,8 +59,15 @@ static int uvc_input_init(struct uvc_device *dev) usb_to_input_id(dev->udev, &input->id); input->dev.parent = &dev->intf->dev; - __set_bit(EV_KEY, input->evbit); - __set_bit(KEY_CAMERA, input->keybit); + if (uvc_input_has_button(dev)) { + __set_bit(EV_KEY, input->evbit); + __set_bit(KEY_CAMERA, input->keybit); + } + + if (dev->gpio_unit) { + __set_bit(EV_SW, input->evbit); + __set_bit(SW_CAMERA_LENS_COVER, input->swbit); + } if ((ret = input_register_device(input)) < 0) goto error; diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h index 91ed59b54d9a..06c4d514d02c 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -229,12 +230,10 @@ struct uvc_entity { u8 *bmControlsType; } extension; - struct { - u8 bControlSize; - u8 *bmControls; - struct gpio_desc *gpio_privacy; + struct uvc_gpio { int irq; bool initialized; + struct gpio_desc *gpio_privacy; } gpio; }; @@ -821,8 +820,14 @@ size_t uvc_video_stats_dump(struct uvc_streaming *stream, char *buf, size_t size); /* gpio */ +#ifdef CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV int uvc_gpio_parse(struct uvc_device *dev); -int uvc_gpio_init_irq(struct uvc_device *dev); +int uvc_gpio_init(struct uvc_device *dev); void uvc_gpio_deinit(struct uvc_device *dev); +#else +static inline int uvc_gpio_parse(struct uvc_device *dev) {return 0; } +static inline int uvc_gpio_init(struct uvc_device *dev) {return 0; } +static inline void uvc_gpio_deinit(struct uvc_device *dev) {}; +#endif #endif