Create a debugfs entry per UVC stream. This will be used to export
stream statistics.
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
drivers/media/video/uvc/Makefile | 2 +-
drivers/media/video/uvc/uvc_debugfs.c | 76 +++++++++++++++++++++++++++++++++
drivers/media/video/uvc/uvc_driver.c | 21 +++++++--
drivers/media/video/uvc/uvcvideo.h | 9 ++++
4 files changed, 102 insertions(+), 6 deletions(-)
create mode 100644 drivers/media/video/uvc/uvc_debugfs.c
diff --git a/drivers/media/video/uvc/Makefile b/drivers/media/video/uvc/Makefile
index 2071ca8..c26d12f 100644
--- a/drivers/media/video/uvc/Makefile
+++ b/drivers/media/video/uvc/Makefile
@@ -1,5 +1,5 @@
uvcvideo-objs := uvc_driver.o uvc_queue.o uvc_v4l2.o uvc_video.o uvc_ctrl.o \
- uvc_status.o uvc_isight.o
+ uvc_status.o uvc_isight.o uvc_debugfs.o
ifeq ($(CONFIG_MEDIA_CONTROLLER),y)
uvcvideo-objs += uvc_entity.o
endif
diff --git a/drivers/media/video/uvc/uvc_debugfs.c b/drivers/media/video/uvc/uvc_debugfs.c
new file mode 100644
index 0000000..f58969a
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_debugfs.c
@@ -0,0 +1,76 @@
+/*
+ * uvc_debugfs.c -- USB Video Class driver - Debugging support
+ *
+ * Copyright (C) 2011
+ * Laurent Pinchart (laurent.pinchart@xxxxxxxxxxxxxxxx)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/debugfs.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+
+#include "uvcvideo.h"
+
+/* -----------------------------------------------------------------------------
+ * Global and stream initialization/cleanup
+ */
+
+static struct dentry *uvc_debugfs_root_dir;
+
+int uvc_debugfs_init_stream(struct uvc_streaming *stream)
+{
+ struct usb_device *udev = stream->dev->udev;
+ struct dentry *dent;
+ char dir_name[32];
+
+ if (uvc_debugfs_root_dir == NULL)
+ return -ENODEV;
+
+ sprintf(dir_name, "%u-%u", udev->bus->busnum, udev->devnum);
+
+ dent = debugfs_create_dir(dir_name, uvc_debugfs_root_dir);
+ if (IS_ERR_OR_NULL(dent)) {
+ uvc_printk(KERN_INFO, "Unable to create debugfs %s directory.\n",
+ dir_name);
+ return -ENODEV;
+ }
+
+ stream->debugfs_dir = dent;
+
+ return 0;
+}
+
+void uvc_debugfs_cleanup_stream(struct uvc_streaming *stream)
+{
+ if (stream->debugfs_dir == NULL)
+ return;
+
+ debugfs_remove_recursive(stream->debugfs_dir);
+ stream->debugfs_dir = NULL;
+}
+
+int uvc_debugfs_init(void)
+{
+ struct dentry *dir;
+
+ dir = debugfs_create_dir("uvcvideo", usb_debug_root);
+ if (IS_ERR_OR_NULL(dir)) {
+ uvc_printk(KERN_INFO, "Unable to create debugfs directory\n");
+ return -ENODATA;
+ }
+
+ uvc_debugfs_root_dir = dir;
+ return 0;
+}
+
+void uvc_debugfs_cleanup(void)
+{
+ if (uvc_debugfs_root_dir != NULL)
+ debugfs_remove_recursive(uvc_debugfs_root_dir);
+}
diff --git a/drivers/media/video/uvc/uvc_driver.c b/drivers/media/video/uvc/uvc_driver.c
index 750ab68..a240d43 100644
--- a/drivers/media/video/uvc/uvc_driver.c
+++ b/drivers/media/video/uvc/uvc_driver.c
@@ -1675,6 +1675,8 @@ static void uvc_unregister_video(struct uvc_device *dev)
video_unregister_device(stream->vdev);
stream->vdev = NULL;
+
+ uvc_debugfs_cleanup_stream(stream);
}
/* Decrement the stream count and call uvc_delete explicitly if there
@@ -1700,6 +1702,8 @@ static int uvc_register_video(struct uvc_device *dev,
return ret;
}
+ uvc_debugfs_init_stream(stream);
+
/* Register the device with V4L. */
vdev = video_device_alloc();
if (vdev == NULL) {
@@ -2405,17 +2409,24 @@ struct uvc_driver uvc_driver = {
static int __init uvc_init(void)
{
- int result;
+ int ret;
- result = usb_register(&uvc_driver.driver);
- if (result == 0)
- printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
- return result;
+ uvc_debugfs_init();
+
+ ret = usb_register(&uvc_driver.driver);
+ if (ret < 0) {
+ uvc_debugfs_cleanup();
+ return ret;
+ }
+
+ printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
+ return 0;
}
static void __exit uvc_cleanup(void)
{
usb_deregister(&uvc_driver.driver);
+ uvc_debugfs_cleanup();
}
module_init(uvc_init);
diff --git a/drivers/media/video/uvc/uvcvideo.h b/drivers/media/video/uvc/uvcvideo.h
index 882159a..2d45e58 100644
--- a/drivers/media/video/uvc/uvcvideo.h
+++ b/drivers/media/video/uvc/uvcvideo.h
@@ -403,6 +403,9 @@ struct uvc_streaming {
__u32 sequence;
__u8 last_fid;
+
+ /* debugfs */
+ struct dentry *debugfs_dir;
};
enum uvc_device_state {
@@ -605,4 +608,10 @@ extern struct usb_host_endpoint *uvc_find_endpoint(
void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
struct uvc_buffer *buf);
+/* debugfs */
+int uvc_debugfs_init(void);
+void uvc_debugfs_cleanup(void);
+int uvc_debugfs_init_stream(struct uvc_streaming *stream);
+void uvc_debugfs_cleanup_stream(struct uvc_streaming *stream);
+
#endif
--
1.7.3.4
--
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