[PATCH v8 3/5] staging: bcm2835-camera: Register bcm2835-camera with vchiq_bus_type

Umang Jain
2023-06-27T20:16:46Z

Register the bcm2835-camera with the vchiq_bus_type instead of using
platform driver/device.

Also the VCHIQ firmware doesn't support device enumeration, hence
one has to maintain a list of devices to be registered in the interface.

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
---
.../bcm2835-camera/bcm2835-camera.c | 16 +++++++-------
.../interface/vchiq_arm/vchiq_arm.c | 21 ++++++++++++++++---
2 files changed, 26 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
index 346d00df815a..f37b2a881d92 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
@@ -24,8 +24,9 @@
#include <media/v4l2-event.h>
#include <media/v4l2-common.h>
#include <linux/delay.h>
-#include <linux/platform_device.h>

+#include "../interface/vchiq_arm/vchiq_arm.h"
+#include "../interface/vchiq_arm/vchiq_device.h"
#include "../vchiq-mmal/mmal-common.h"
#include "../vchiq-mmal/mmal-encodings.h"
#include "../vchiq-mmal/mmal-vchiq.h"
@@ -1841,7 +1842,7 @@ static struct v4l2_format default_v4l2_format = {
.fmt.pix.sizeimage = 1024 * 768,
};

-static int bcm2835_mmal_probe(struct platform_device *pdev)
+static int bcm2835_mmal_probe(struct vchiq_device *device)
{
int ret;
struct bcm2835_mmal_dev *dev;
@@ -1896,7 +1897,7 @@ static int bcm2835_mmal_probe(struct platform_device *pdev)
&camera_instance);
ret = v4l2_device_register(NULL, &dev->v4l2_dev);
if (ret) {
- dev_err(&pdev->dev, "%s: could not register V4L2 device: %d\n",
+ dev_err(&device->dev, "%s: could not register V4L2 device: %d\n",
__func__, ret);
goto free_dev;
}
@@ -1976,7 +1977,7 @@ static int bcm2835_mmal_probe(struct platform_device *pdev)
return ret;
}

-static void bcm2835_mmal_remove(struct platform_device *pdev)
+static void bcm2835_mmal_remove(struct vchiq_device *device)
{
int camera;
struct vchiq_mmal_instance *instance = gdev[0]->instance;
@@ -1988,17 +1989,16 @@ static void bcm2835_mmal_remove(struct platform_device *pdev)
vchiq_mmal_finalise(instance);
}

-static struct platform_driver bcm2835_camera_driver = {
+static struct vchiq_driver bcm2835_camera_driver = {
.probe = bcm2835_mmal_probe,
- .remove_new = bcm2835_mmal_remove,
+ .remove = bcm2835_mmal_remove,
.driver = {
.name = "bcm2835-camera",
},
};

-module_platform_driver(bcm2835_camera_driver)
+module_vchiq_driver(bcm2835_camera_driver)

MODULE_DESCRIPTION("Broadcom 2835 MMAL video capture");
MODULE_AUTHOR("Vincent Sanders");
MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:bcm2835-camera");
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
index e8d40f891449..79d4d0eeb5fb 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -67,7 +67,6 @@ int vchiq_susp_log_level = VCHIQ_LOG_ERROR;
DEFINE_SPINLOCK(msg_queue_spinlock);
struct vchiq_state g_state;

-static struct platform_device *bcm2835_camera;
static struct platform_device *bcm2835_audio;

struct vchiq_drvdata {
@@ -134,6 +133,15 @@ struct vchiq_pagelist_info {
unsigned int scatterlist_mapped;
};

+/*
+ * The devices implemented in the VCHIQ firmware are not discoverable,
+ * so we need to maintain a list of them in order to register them with
+ * the interface.
+ */
+static const char *const vchiq_devices[] = {
+ "bcm2835-camera",
+};
+
static void __iomem *g_regs;
/* This value is the size of the L2 cache lines as understood by the
* VPU firmware, which determines the required alignment of the
@@ -1798,6 +1806,7 @@ static int vchiq_probe(struct platform_device *pdev)
struct device_node *fw_node;
const struct of_device_id *of_id;
struct vchiq_drvdata *drvdata;
+ unsigned int i;
int err;

of_id = of_match_node(vchiq_of_match, pdev->dev.of_node);
@@ -1840,9 +1849,15 @@ static int vchiq_probe(struct platform_device *pdev)
goto error_exit;
}

- bcm2835_camera = vchiq_register_child(pdev, "bcm2835-camera");
bcm2835_audio = vchiq_register_child(pdev, "bcm2835_audio");

+ for (i = 0; i < ARRAY_SIZE(vchiq_devices); i++) {
+ err = vchiq_device_register(&pdev->dev, vchiq_devices[i]);
+ if (err)
+ dev_err(&pdev->dev, "Failed to register %s vchiq device\n",
+ vchiq_devices[i]);
+ }
+
return 0;

failed_platform_init:
@@ -1854,7 +1869,7 @@ static int vchiq_probe(struct platform_device *pdev)
static void vchiq_remove(struct platform_device *pdev)
{
platform_device_unregister(bcm2835_audio);
- platform_device_unregister(bcm2835_camera);
+ bus_for_each_dev(&vchiq_bus_type, NULL, NULL, vchiq_device_unregister);
vchiq_debugfs_deinit();
vchiq_deregister_chrdev();
}
--
2.39.1