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Message-ID: <20250422222517.GU17813@pendragon.ideasonboard.com>
Date: Wed, 23 Apr 2025 01:25:17 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: Hans de Goede <hdegoede@...hat.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Hans Verkuil <hverkuil@...all.nl>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <brgl@...ev.pl>, linux-media@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
devicetree@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH 6/8] media: uvcvideo: Factor out gpio functions to its
own file
On Wed, Apr 23, 2025 at 06:20:09AM +0800, Ricardo Ribalda wrote:
> Hi Laurent
>
> On Wed, 23 Apr 2025 at 05:28, Laurent Pinchart
> <laurent.pinchart@...asonboard.com> wrote:
> >
> > Hi Ricardo,
> >
> > Thank you for the patch.
> >
> > Hans raised an issue on "[PATCH v3 2/8] media: uvcvideo: Factor out gpio
> > functions to its own file" (part of "[PATCH v3 0/8] media: uvcvideo:
> > Implement the Privacy GPIO as a evdev"), asking if GPIO handling should
> > still use a uvc_entity if it moves to a evdev. There are implications on
> > this series too. Unless I'm mistaken, I haven't seen a reply from you to
> > my last e-mail. Can we please first finish that discussion ?
>
> Are you referring to:
> https://lore.kernel.org/all/0dfb780b-f2dc-43ed-a67d-afd5f50bb88f@redhat.com/
> ?
I was referring to https://lore.kernel.org/all/20241125214523.GW19381@pendragon.ideasonboard.com/
> Is it an open discussion? I believe we agreed to remove the uvc_entity.
>
> I posted v4 back in november. In that version I remove completely the
> uvc_entity:
> https://patchwork.linuxtv.org/project/linux-media/patch/20241125-uvc-subdev-v4-6-51e040599f1a@chromium.org/
Should I review that series first ?
> > On Thu, Apr 03, 2025 at 07:16:17PM +0000, Ricardo Ribalda wrote:
> > > This is just a refactor patch, no new functionality is added.
> > >
> > > Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> > > ---
> > > drivers/media/usb/uvc/Makefile | 3 +-
> > > drivers/media/usb/uvc/uvc_driver.c | 121 +-----------------------------------
> > > drivers/media/usb/uvc/uvc_gpio.c | 123 +++++++++++++++++++++++++++++++++++++
> > > drivers/media/usb/uvc/uvcvideo.h | 6 ++
> > > 4 files changed, 133 insertions(+), 120 deletions(-)
> > >
> > > diff --git a/drivers/media/usb/uvc/Makefile b/drivers/media/usb/uvc/Makefile
> > > index 4f9eee4f81ab6436a8b90324a688a149b2c3bcd1..85514b6e538fbb8284e574ca14700f2d749e1a2e 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 da24a655ab68cc0957762f2b67387677c22224d1..b52e1ff401e24f69b867b5e975cda4260463e760 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>
> > > @@ -792,8 +791,8 @@ 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_entity(u16 type, u16 id,
> > > - unsigned int num_pads, unsigned int extra_size)
> > > +struct uvc_entity *uvc_alloc_entity(u16 type, u16 id, unsigned int num_pads,
> > > + unsigned int extra_size)
> > > {
> > > struct uvc_entity *entity;
> > > unsigned int num_inputs;
> > > @@ -1242,122 +1241,6 @@ 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 (!gpio_privacy)
> > > - return 0;
> > > -
> > > - if (IS_ERR(gpio_privacy))
> > > - return dev_err_probe(&dev->intf->dev,
> > > - PTR_ERR(gpio_privacy),
> > > - "Can't get privacy GPIO\n");
> > > -
> > > - 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_entity(UVC_EXT_GPIO_UNIT, UVC_EXT_GPIO_UNIT_ID, 0, 1);
> > > - if (!unit)
> > > - return -ENOMEM;
> > > -
> > > - 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 0000000000000000000000000000000000000000..30e3e6dd22cbc9cfee420dde7f7f64dbdce499b9
> > > --- /dev/null
> > > +++ b/drivers/media/usb/uvc/uvc_gpio.c
> > > @@ -0,0 +1,123 @@
> > > +// SPDX-License-Identifier: GPL-2.0-or-later
> > > +/*
> > > + * uvc_gpio.c -- USB Video Class driver
> > > + *
> > > + * Copyright 2025 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 (!gpio_privacy)
> > > + return 0;
> > > +
> > > + if (IS_ERR(gpio_privacy))
> > > + return dev_err_probe(&dev->intf->dev,
> > > + PTR_ERR(gpio_privacy),
> > > + "Can't get privacy GPIO\n");
> > > +
> > > + 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_entity(UVC_EXT_GPIO_UNIT, UVC_EXT_GPIO_UNIT_ID, 0, 1);
> > > + if (!unit)
> > > + return -ENOMEM;
> > > +
> > > + 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 b4ee701835fc016474d2cd2a0b67b2aa915c1c60..aef96b96499ce09ffa286c51793482afd9832097 100644
> > > --- a/drivers/media/usb/uvc/uvcvideo.h
> > > +++ b/drivers/media/usb/uvc/uvcvideo.h
> > > @@ -683,6 +683,8 @@ do { \
> > > */
> > >
> > > struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id);
> > > +struct uvc_entity *uvc_alloc_entity(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);
> > > @@ -829,4 +831,8 @@ 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_parse(struct uvc_device *dev);
> > > +int uvc_gpio_init_irq(struct uvc_device *dev);
> > > +void uvc_gpio_deinit(struct uvc_device *dev);
> > > #endif
> > >
--
Regards,
Laurent Pinchart
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