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Message-Id: <20250718-uvc-subdev-v5-2-a5869b071b0d@chromium.org>
Date: Fri, 18 Jul 2025 15:29:11 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Hans de Goede <hansg@...nel.org>, Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <brgl@...ev.pl>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
Yunke Cao <yunkec@...omium.org>, linux-gpio@...r.kernel.org,
linux-usb@...r.kernel.org, Ricardo Ribalda <ribalda@...omium.org>,
Hans Verkuil <hverkuil@...nel.org>, Hans de Goede <hansg@...nel.org>
Subject: [PATCH v5 2/5] media: uvcvideo: Re-implement privacy GPIO as an
input device
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 <ribalda@...omium.org>
---
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_gpio.c | 72 +++++++++++++-------------------------
drivers/media/usb/uvc/uvc_status.c | 13 +++++--
drivers/media/usb/uvc/uvcvideo.h | 15 +++++---
7 files changed, 51 insertions(+), 80 deletions(-)
diff --git a/drivers/media/usb/uvc/Kconfig b/drivers/media/usb/uvc/Kconfig
index 579532272fd6d7a8ef65c1a3a892b723f40e584e..cdbba7fd5bee2427d7f908283a6648d0a4888e0d 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 85514b6e538fbb8284e574ca14700f2d749e1a2e..b36b124da7a8190760353b22805e8cd23a7723c2 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 efe609d7087752cb2ef516eef0fce12acd13e747..17a9af857308c6311824807f6e3438974bc88f55 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,
- },
/*
* UVC_CTRL_FLAG_AUTO_UPDATE is needed because the RoI may get updated
* by sensors.
@@ -939,15 +931,6 @@ 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,
@@ -3252,9 +3235,6 @@ 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 56bf741e55ed22052f2f4773244ef49c08a2fdae..89a4ac8a358f508220bca43078964bc2a8a6c4a5 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -2158,6 +2158,7 @@ static int uvc_probe(struct usb_interface *intf,
if (ret < 0)
goto error;
#endif
+
/* Save our data pointer in the interface data. */
usb_set_intfdata(intf, dev);
@@ -2169,7 +2170,7 @@ 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_gpio.c b/drivers/media/usb/uvc/uvc_gpio.c
index 45c169eb933815baab3d166abace46f269d9241e..93727185b9125d5a0ebf7fcede5ed8983ecddd5f 100644
--- a/drivers/media/usb/uvc/uvc_gpio.c
+++ b/drivers/media/usb/uvc/uvc_gpio.c
@@ -7,57 +7,29 @@
#include <linux/kernel.h>
#include <linux/gpio/consumer.h>
+#include <linux/input.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;
+ 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",
@@ -81,13 +53,7 @@ int uvc_gpio_parse(struct uvc_device *dev)
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;
@@ -95,22 +61,32 @@ 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 ee01dce4b7834b05aab95379191c305cf8cec7f7..664ba59af8ecad5511c9dea924bf037b2aafc0d0 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 63df6fb89ed29c76ed0ded9283a2c5e817bf6500..aca857d3f5608550faa5241f3b515bb9837f70ab 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -15,6 +15,7 @@
#include <linux/videodev2.h>
#include <linux/workqueue.h>
#include <media/media-device.h>
+#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-event.h>
#include <media/v4l2-fh.h>
@@ -238,12 +239,10 @@ 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;
};
@@ -817,8 +816,14 @@ 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
--
2.50.0.727.gbf7dc18ff4-goog
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