[PATCH v12 5/6] staging: bcm2835-camera: Register bcm2835-camera with vchiq_bus_type

Umang Jain
2023-09-23T14:32:15Z

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

Since we moved away bcm2835-camera from platform driver/device,
we have to set the DMA mask explicitly. Set the DMA mask at probe
time.

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 | 21 ++++++++++---------
.../interface/vchiq_arm/vchiq_arm.c | 11 +++++++---
2 files changed, 19 insertions(+), 13 deletions(-)

diff --git a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
index fcad5118f3e8..c873eace1437 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
@@ -11,6 +11,7 @@
* Luke Diamand @ Broadcom
*/

+#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -24,8 +25,8 @@
#include <media/v4l2-event.h>
#include <media/v4l2-common.h>
#include <linux/delay.h>
-#include <linux/platform_device.h>

+#include "../interface/vchiq_arm/vchiq_bus.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;
@@ -1852,9 +1853,9 @@ static int bcm2835_mmal_probe(struct platform_device *pdev)
unsigned int resolutions[MAX_BCM2835_CAMERAS][2];
int i;

- ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+ ret = dma_set_mask_and_coherent(&device->dev, DMA_BIT_MASK(32));
if (ret) {
- dev_err(&pdev->dev, "dma_set_mask_and_coherent failed: %d\n", ret);
+ dev_err(&device->dev, "dma_set_mask_and_coherent failed: %d\n", ret);
return ret;
}

@@ -1902,7 +1903,7 @@ 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;
}
@@ -1982,7 +1983,7 @@ 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;
@@ -1994,17 +1995,17 @@ 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");
+MODULE_ALIAS("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 9388859b9b56..886025f0a452 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -67,8 +67,13 @@ 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;
+/*
+ * 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 struct vchiq_device *bcm2835_camera;

struct vchiq_drvdata {
const unsigned int cache_line_size;
@@ -1840,8 +1845,8 @@ 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");
+ bcm2835_camera = vchiq_device_register(&pdev->dev, "bcm2835-camera");

return 0;

@@ -1854,7 +1859,7 @@ 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);
+ vchiq_device_unregister(bcm2835_camera);
vchiq_debugfs_deinit();
vchiq_deregister_chrdev();
}
--
2.40.1