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Message-ID: <7da09249-f2ff-4a0c-8a06-1594b02ce87a@redhat.com>
Date: Mon, 25 Nov 2024 15:45:38 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: Ricardo Ribalda <ribalda@...omium.org>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
Yunke Cao <yunkec@...omium.org>, Hans Verkuil <hverkuil@...all.nl>
Subject: Re: [PATCH v3 2/8] media: uvcvideo: Factor out gpio functions to its
own file
Hi Ricardo,
On 12-Nov-24 6:30 PM, Ricardo Ribalda wrote:
> This is just a refactor patch, no new functionality is added.
>
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
I guess this patch may need to change depending on if we want
to keep the GPIO handling as a UVC entity or not.
Laurent what is your take on this, should this stay as
a struct uvc_entity; or should the gpio_desc and input_device
be stored directly inside struct uvc_device as is done for
the snapshot-button input_device?
Also de we want a separate input_device for this or do
we re-use the snapshot button one ?
Since my plan is to open-up the permission on the device with
the SW_CAMERA_LENS_COVER to be equal to the /dev/video#
permissions sharing has the downside of allowing keylogging
of the snapshot button.
Either way (one or 2 input-devices) I don't have a strong
preference.
Regards,
Hans
> ---
> drivers/media/usb/uvc/Makefile | 3 +-
> drivers/media/usb/uvc/uvc_driver.c | 119 +------------------------------------
> drivers/media/usb/uvc/uvc_gpio.c | 118 ++++++++++++++++++++++++++++++++++++
> drivers/media/usb/uvc/uvcvideo.h | 8 +++
> 4 files changed, 131 insertions(+), 117 deletions(-)
>
> 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 cd13bf01265d..5b48768a4f7f 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;
> @@ -1240,118 +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->intf->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->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);
> - 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;
> - int ret;
> -
> - if (!unit || unit->gpio.irq < 0)
> - return 0;
> -
> - ret = request_threaded_irq(unit->gpio.irq, NULL, uvc_gpio_irq,
> - IRQF_ONESHOT | IRQF_TRIGGER_FALLING |
> - IRQF_TRIGGER_RISING,
> - "uvc_privacy_gpio", dev);
> -
> - unit->gpio.initialized = !ret;
> -
> - return ret;
> -}
> -
> -static void uvc_gpio_deinit(struct uvc_device *dev)
> -{
> - if (!dev->gpio_unit || !dev->gpio_unit->gpio.initialized)
> - return;
> -
> - free_irq(dev->gpio_unit->gpio.irq, 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..453739acbe8f
> --- /dev/null
> +++ b/drivers/media/usb/uvc/uvc_gpio.c
> @@ -0,0 +1,118 @@
> +// 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->intf->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;
> + int ret;
> +
> + if (!unit || unit->gpio.irq < 0)
> + return 0;
> +
> + ret = request_threaded_irq(unit->gpio.irq, NULL, uvc_gpio_irq,
> + IRQF_ONESHOT | IRQF_TRIGGER_FALLING |
> + IRQF_TRIGGER_RISING,
> + "uvc_privacy_gpio", dev);
> +
> + unit->gpio.initialized = !ret;
> +
> + return ret;
> +}
> +
> +void uvc_gpio_deinit(struct uvc_device *dev)
> +{
> + if (!dev->gpio_unit || !dev->gpio_unit->gpio.initialized)
> + return;
> +
> + free_irq(dev->gpio_unit->gpio.irq, dev);
> +}
> diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
> index 965a789ed03e..91ed59b54d9a 100644
> --- a/drivers/media/usb/uvc/uvcvideo.h
> +++ b/drivers/media/usb/uvc/uvcvideo.h
> @@ -673,6 +673,9 @@ 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,
> @@ -817,4 +820,9 @@ 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_parse(struct uvc_device *dev);
> +int uvc_gpio_init_irq(struct uvc_device *dev);
> +void uvc_gpio_deinit(struct uvc_device *dev);
> +
> #endif
>
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