[PATCH 6/8] media: uvcvideo: Factor out gpio functions to its own file

[Ricardo Ribalda <ribalda@chromium.org>]

This is just a refactor patch, no new functionality is added.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.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

-- 
2.49.0.504.g3bcea36a83-goog