[1/7] media: uvcvideo: Factor out gpio functions to its own file

Message ID	20241031-uvc-subdev-v1-1-a68331cedd72@chromium.org
State	New
Headers	show Received: from mail-qv1-f54.google.com (mail-qv1-f54.google.com [209.85.219.54]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E6E5919DF60 for <linux-media@vger.kernel.org>; Thu, 31 Oct 2024 13:43:19 +0000 (UTC) From: Ricardo Ribalda <ribalda@chromium.org> Date: Thu, 31 Oct 2024 13:43:14 +0000 Subject: [PATCH 1/7] media: uvcvideo: Factor out gpio functions to its own file Precedence: bulk MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20241031-uvc-subdev-v1-1-a68331cedd72@chromium.org> References: <20241031-uvc-subdev-v1-0-a68331cedd72@chromium.org> In-Reply-To: <20241031-uvc-subdev-v1-0-a68331cedd72@chromium.org> To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>, Mauro Carvalho Chehab <mchehab@kernel.org>, Sakari Ailus <sakari.ailus@linux.intel.com> Cc: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, Yunke Cao <yunkec@chromium.org>, Hans Verkuil <hverkuil@xs4all.nl>, Ricardo Ribalda <ribalda@chromium.org>
Series	media: uvcvideo: Implement the Privacy GPIO as a subdevice \| expand [0/7] media: uvcvideo: Implement the Privacy GPIO as a subdevice [1/7] media: uvcvideo: Factor out gpio functions to its own file [2/7] media: uvcvideo: reimplement privacy GPIO as a separate subdevice [3/7] Revert "media: uvcvideo: Allow entity-defined get_info and get_cur" [4/7] media: uvcvideo: Create ancillary link for GPIO subdevice [5/7] media: v4l2-core: Add new MEDIA_ENT_F_GPIO [6/7] media: uvcvideo: Use MEDIA_ENT_F_GPIO for the GPIO entity [7/7] media: uvcvideo: Introduce UVC_QUIRK_PRIVACY_DURING_STREAM

diff --git a/drivers/media/usb/uvc/Makefile b/drivers/media/usb/uvc/Makefile index 4f9eee4f81ab..85514b6e538f 100644 --- a/drivers/media/usb/uvc/Makefile +++ b/drivers/media/usb/uvc/Makefile @@ -1,6 +1,7 @@ # 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_status.o uvc_isight.o uvc_debugfs.o uvc_metadata.o \ + uvc_gpio.o ifeq ($(CONFIG_MEDIA_CONTROLLER),y) uvcvideo-objs += uvc_entity.o endif diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c index a96f6ca0889f..94fb8e50a50c 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -8,7 +8,6 @@ #include <linux/atomic.h> #include <linux/bits.h> -#include <linux/gpio/consumer.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/module.h> @@ -775,9 +774,9 @@ static const u8 uvc_media_transport_input_guid[16] = UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT; static const u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING; -static struct uvc_entity *uvc_alloc_new_entity(struct uvc_device *dev, u16 type, - u16 id, unsigned int num_pads, - unsigned int extra_size) +struct uvc_entity *uvc_alloc_new_entity(struct uvc_device *dev, u16 type, + u16 id, unsigned int num_pads, + unsigned int extra_size) { struct uvc_entity *entity; unsigned int num_inputs; @@ -1240,106 +1239,6 @@ static int uvc_parse_control(struct uvc_device *dev) return 0; } -/* ----------------------------------------------------------------------------- - * Privacy GPIO - */ - -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; - - uvc_gpio_event(dev); - return IRQ_HANDLED; -} - -static int uvc_gpio_parse(struct uvc_device *dev) -{ - struct uvc_entity *unit; - struct gpio_desc *gpio_privacy; - int irq; - - gpio_privacy = devm_gpiod_get_optional(&dev->udev->dev, "privacy", - GPIOD_IN); - if (IS_ERR_OR_NULL(gpio_privacy)) - return PTR_ERR_OR_ZERO(gpio_privacy); - - irq = gpiod_to_irq(gpio_privacy); - if (irq < 0) - return dev_err_probe(&dev->udev->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); - 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; - - return 0; -} - -static int uvc_gpio_init_irq(struct uvc_device *dev) -{ - struct uvc_entity *unit = dev->gpio_unit; - - if (!unit || unit->gpio.irq < 0) - return 0; - - return devm_request_threaded_irq(&dev->udev->dev, unit->gpio.irq, NULL, - uvc_gpio_irq, - IRQF_ONESHOT | IRQF_TRIGGER_FALLING | - IRQF_TRIGGER_RISING, - "uvc_privacy_gpio", dev); -} - /* ------------------------------------------------------------------------ * UVC device scan */ diff --git a/drivers/media/usb/uvc/uvc_gpio.c b/drivers/media/usb/uvc/uvc_gpio.c new file mode 100644 index 000000000000..5b74131795c5 --- /dev/null +++ b/drivers/media/usb/uvc/uvc_gpio.c @@ -0,0 +1,107 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * uvc_gpio.c -- USB Video Class driver + * + * Copyright 2024 Google LLC + */ + +#include <linux/kernel.h> +#include <linux/gpio/consumer.h> +#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; + + uvc_gpio_event(dev); + return IRQ_HANDLED; +} + +int uvc_gpio_parse(struct uvc_device *dev) +{ + struct uvc_entity *unit; + struct gpio_desc *gpio_privacy; + int irq; + + gpio_privacy = devm_gpiod_get_optional(&dev->udev->dev, "privacy", + GPIOD_IN); + if (IS_ERR_OR_NULL(gpio_privacy)) + return PTR_ERR_OR_ZERO(gpio_privacy); + + irq = gpiod_to_irq(gpio_privacy); + if (irq < 0) + return dev_err_probe(&dev->udev->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); + 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; + + return 0; +} + +int uvc_gpio_init_irq(struct uvc_device *dev) +{ + struct uvc_entity *unit = dev->gpio_unit; + + if (!unit || unit->gpio.irq < 0) + return 0; + + return devm_request_threaded_irq(&dev->udev->dev, unit->gpio.irq, NULL, + uvc_gpio_irq, + IRQF_ONESHOT | IRQF_TRIGGER_FALLING | + IRQF_TRIGGER_RISING, + "uvc_privacy_gpio", dev); +} + diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h index 07f9921d83f2..c7519d59d611 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -672,6 +672,9 @@ do { \ extern struct uvc_driver uvc_driver; struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id); +struct uvc_entity *uvc_alloc_new_entity(struct uvc_device *dev, u16 type, + u16 id, unsigned int num_pads, + unsigned int extra_size); /* Video buffers queue management. */ int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type, @@ -816,4 +819,8 @@ void uvc_debugfs_cleanup_stream(struct uvc_streaming *stream); size_t uvc_video_stats_dump(struct uvc_streaming *stream, char *buf, size_t size); +/* gpio */ +int uvc_gpio_init_irq(struct uvc_device *dev); +int uvc_gpio_parse(struct uvc_device *dev); + #endif

[1/7] media: uvcvideo: Factor out gpio functions to its own file

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Patch