Using enums makes easier to document, as it can use kernel-doc
markups. It also allows cross-referencing, with increases the
kAPI readability.
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
---
Documentation/media/kapi/v4l2-dev.rst | 17 ++++++---
drivers/media/pci/cx88/cx88-blackbird.c | 3 +-
drivers/media/pci/cx88/cx88-video.c | 10 +++---
drivers/media/pci/cx88/cx88.h | 4 +--
drivers/media/pci/saa7134/saa7134-video.c | 2 ++
drivers/media/usb/cx231xx/cx231xx-video.c | 2 ++
drivers/media/usb/pvrusb2/pvrusb2-v4l2.c | 2 ++
drivers/media/usb/tm6000/tm6000-video.c | 2 ++
drivers/media/v4l2-core/v4l2-dev.c | 10 +++---
include/media/v4l2-dev.h | 59 +++++++++++++++++--------------
include/media/v4l2-mediabus.h | 30 ++++++++++++++++
11 files changed, 98 insertions(+), 43 deletions(-)
diff --git a/Documentation/media/kapi/v4l2-dev.rst
b/Documentation/media/kapi/v4l2-dev.rst
index b29aa616c267..7bb0505b60f1 100644
--- a/Documentation/media/kapi/v4l2-dev.rst
+++ b/Documentation/media/kapi/v4l2-dev.rst
@@ -196,11 +196,18 @@ device.
Which device is registered depends on the type argument. The following
types exist:
-- ``VFL_TYPE_GRABBER``: ``/dev/videoX`` for video input/output devices
-- ``VFL_TYPE_VBI``: ``/dev/vbiX`` for vertical blank data (i.e. closed
captions, teletext)
-- ``VFL_TYPE_RADIO``: ``/dev/radioX`` for radio tuners
-- ``VFL_TYPE_SDR``: ``/dev/swradioX`` for Software Defined Radio tuners
-- ``VFL_TYPE_TOUCH``: ``/dev/v4l-touchX`` for touch sensors
+========================== ====================
==============================
+:c:type:`vfl_devnode_type` Device name Usage
+========================== ====================
==============================
+``VFL_TYPE_GRABBER`` ``/dev/videoX`` for video input/output devices
+``VFL_TYPE_VBI`` ``/dev/vbiX`` for vertical blank data (i.e.
+ closed captions, teletext)
+``VFL_TYPE_RADIO`` ``/dev/radioX`` for radio tuners
+``VFL_TYPE_SUBDEV`` ``/dev/v4l-subdevX`` for V4L2 subdevices
+``VFL_TYPE_SDR`` ``/dev/swradioX`` for Software Defined Radio
+ (SDR) tuners
+``VFL_TYPE_TOUCH`` ``/dev/v4l-touchX`` for touch sensors
+========================== ====================
==============================
The last argument gives you a certain amount of control over the device
device node number used (i.e. the X in ``videoX``). Normally you will pass -1
diff --git a/drivers/media/pci/cx88/cx88-blackbird.c
b/drivers/media/pci/cx88/cx88-blackbird.c
index e3101f04941c..0e0952e60795 100644
--- a/drivers/media/pci/cx88/cx88-blackbird.c
+++ b/drivers/media/pci/cx88/cx88-blackbird.c
@@ -805,8 +805,7 @@ static int vidioc_querycap(struct file *file, void *priv,
strcpy(cap->driver, "cx88_blackbird");
sprintf(cap->bus_info, "PCI:%s", pci_name(dev->pci));
- cx88_querycap(file, core, cap);
- return 0;
+ return cx88_querycap(file, core, cap);
}
static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
diff --git a/drivers/media/pci/cx88/cx88-video.c
b/drivers/media/pci/cx88/cx88-video.c
index 7d25ecd4404b..9be682cdb644 100644
--- a/drivers/media/pci/cx88/cx88-video.c
+++ b/drivers/media/pci/cx88/cx88-video.c
@@ -806,8 +806,8 @@ static int vidioc_s_fmt_vid_cap(struct file *file, void
*priv,
return 0;
}
-void cx88_querycap(struct file *file, struct cx88_core *core,
- struct v4l2_capability *cap)
+int cx88_querycap(struct file *file, struct cx88_core *core,
+ struct v4l2_capability *cap)
{
struct video_device *vdev = video_devdata(file);
@@ -825,11 +825,14 @@ void cx88_querycap(struct file *file, struct cx88_core
*core,
case VFL_TYPE_VBI:
cap->device_caps |= V4L2_CAP_VBI_CAPTURE;
break;
+ default:
+ return -EINVAL;
}
cap->capabilities = cap->device_caps | V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_VBI_CAPTURE | V4L2_CAP_DEVICE_CAPS;
if (core->board.radio.type == CX88_RADIO)
cap->capabilities |= V4L2_CAP_RADIO;
+ return 0;
}
EXPORT_SYMBOL(cx88_querycap);
@@ -841,8 +844,7 @@ static int vidioc_querycap(struct file *file, void *priv,
strcpy(cap->driver, "cx8800");
sprintf(cap->bus_info, "PCI:%s", pci_name(dev->pci));
- cx88_querycap(file, core, cap);
- return 0;
+ return cx88_querycap(file, core, cap);
}
static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
diff --git a/drivers/media/pci/cx88/cx88.h b/drivers/media/pci/cx88/cx88.h
index 6777926f20f2..07a33f02fef4 100644
--- a/drivers/media/pci/cx88/cx88.h
+++ b/drivers/media/pci/cx88/cx88.h
@@ -734,7 +734,7 @@ int cx8802_start_dma(struct cx8802_dev *dev,
int cx88_enum_input(struct cx88_core *core, struct v4l2_input *i);
int cx88_set_freq(struct cx88_core *core, const struct v4l2_frequency *f);
int cx88_video_mux(struct cx88_core *core, unsigned int input);
-void cx88_querycap(struct file *file, struct cx88_core *core,
- struct v4l2_capability *cap);
+int cx88_querycap(struct file *file, struct cx88_core *core,
+ struct v4l2_capability *cap);
#endif
diff --git a/drivers/media/pci/saa7134/saa7134-video.c
b/drivers/media/pci/saa7134/saa7134-video.c
index 51d42bbf969e..e5e02eab3e23 100644
--- a/drivers/media/pci/saa7134/saa7134-video.c
+++ b/drivers/media/pci/saa7134/saa7134-video.c
@@ -1531,6 +1531,8 @@ int saa7134_querycap(struct file *file, void *priv,
case VFL_TYPE_VBI:
cap->device_caps |= vbi_caps;
break;
+ default:
+ return -EINVAL;
}
cap->capabilities = radio_caps | video_caps | vbi_caps |
cap->device_caps | V4L2_CAP_DEVICE_CAPS;
diff --git a/drivers/media/usb/cx231xx/cx231xx-video.c
b/drivers/media/usb/cx231xx/cx231xx-video.c
index 179b8481a870..946306aa4a4e 100644
--- a/drivers/media/usb/cx231xx/cx231xx-video.c
+++ b/drivers/media/usb/cx231xx/cx231xx-video.c
@@ -1756,6 +1756,8 @@ static int cx231xx_v4l2_open(struct file *filp)
case VFL_TYPE_RADIO:
radio = 1;
break;
+ default:
+ return -EINVAL;
}
cx231xx_videodbg("open dev=%s type=%s users=%d\n",
diff --git a/drivers/media/usb/pvrusb2/pvrusb2-v4l2.c
b/drivers/media/usb/pvrusb2/pvrusb2-v4l2.c
index 4320bda9352d..864830d4c741 100644
--- a/drivers/media/usb/pvrusb2/pvrusb2-v4l2.c
+++ b/drivers/media/usb/pvrusb2/pvrusb2-v4l2.c
@@ -153,6 +153,8 @@ static int pvr2_querycap(struct file *file, void *priv,
struct v4l2_capability *
case VFL_TYPE_RADIO:
cap->device_caps = V4L2_CAP_RADIO;
break;
+ default:
+ return -EINVAL;
}
cap->device_caps |= V4L2_CAP_TUNER | V4L2_CAP_READWRITE;
return 0;
diff --git a/drivers/media/usb/tm6000/tm6000-video.c
b/drivers/media/usb/tm6000/tm6000-video.c
index ec8c4d2534dc..6b8a2e265762 100644
--- a/drivers/media/usb/tm6000/tm6000-video.c
+++ b/drivers/media/usb/tm6000/tm6000-video.c
@@ -1330,6 +1330,8 @@ static int __tm6000_open(struct file *file)
case VFL_TYPE_RADIO:
radio = 1;
break;
+ default:
+ return -EINVAL;
}
/* If more than one user, mutex should be added */
diff --git a/drivers/media/v4l2-core/v4l2-dev.c
b/drivers/media/v4l2-core/v4l2-dev.c
index c647ba648805..d5e0e536ef04 100644
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -102,7 +102,7 @@ static DECLARE_BITMAP(devnode_nums[VFL_TYPE_MAX],
VIDEO_NUM_DEVICES);
#ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES
/* Return the bitmap corresponding to vfl_type. */
-static inline unsigned long *devnode_bits(int vfl_type)
+static inline unsigned long *devnode_bits(enum vfl_devnode_type vfl_type)
{
/* Any types not assigned to fixed minor ranges must be mapped to
one single bitmap for the purposes of finding a free node number
@@ -113,7 +113,7 @@ static inline unsigned long *devnode_bits(int vfl_type)
}
#else
/* Return the bitmap corresponding to vfl_type. */
-static inline unsigned long *devnode_bits(int vfl_type)
+static inline unsigned long *devnode_bits(enum vfl_devnode_type vfl_type)
{
return devnode_nums[vfl_type];
}
@@ -821,8 +821,10 @@ static int video_register_media_controller(struct
video_device *vdev, int type)
return 0;
}
-int __video_register_device(struct video_device *vdev, int type, int nr,
- int warn_if_nr_in_use, struct module *owner)
+int __video_register_device(struct video_device *vdev,
+ enum vfl_devnode_type type,
+ int nr, int warn_if_nr_in_use,
+ struct module *owner)
{
int i = 0;
int ret;
diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index de1a1453cfd9..f182b47dfd71 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -20,13 +20,25 @@
#define VIDEO_MAJOR 81
-#define VFL_TYPE_GRABBER 0
-#define VFL_TYPE_VBI 1
-#define VFL_TYPE_RADIO 2
-#define VFL_TYPE_SUBDEV 3
-#define VFL_TYPE_SDR 4
-#define VFL_TYPE_TOUCH 5
-#define VFL_TYPE_MAX 6
+/**
+ * enum vfl_devnode_type - type of V4L2 device node
+ *
+ * @VFL_TYPE_GRABBER: for video input/output devices
+ * @VFL_TYPE_VBI: for vertical blank data (i.e. closed captions, teletext)
+ * @VFL_TYPE_RADIO: for radio tuners
+ * @VFL_TYPE_SUBDEV: for V4L2 subdevices
+ * @VFL_TYPE_SDR: for Software Defined Radio tuners
+ * @VFL_TYPE_TOUCH: for touch sensors
+ */
+enum vfl_devnode_type {
+ VFL_TYPE_GRABBER = 0,
+ VFL_TYPE_VBI = 1,
+ VFL_TYPE_RADIO = 2,
+ VFL_TYPE_SUBDEV = 3,
+ VFL_TYPE_SDR = 4,
+ VFL_TYPE_TOUCH = 5,
+};
+#define VFL_TYPE_MAX VFL_TYPE_TOUCH
/* Is this a receiver, transmitter or mem-to-mem? */
/* Ignored for VFL_TYPE_SUBDEV. */
@@ -188,7 +200,7 @@ struct v4l2_file_operations {
* @prio: pointer to &struct v4l2_prio_state with device's Priority state.
* If NULL, then v4l2_dev->prio will be used.
* @name: video device name
- * @vfl_type: V4L device type
+ * @vfl_type: V4L device type, as defined by &enum vfl_devnode_type
* @vfl_dir: V4L receiver, transmitter or m2m
* @minor: device node 'minor'. It is set to -1 if the registration failed
* @num: number of the video device node
@@ -236,7 +248,7 @@ struct video_device
/* device info */
char name[32];
- int vfl_type;
+ enum vfl_devnode_type vfl_type;
int vfl_dir;
int minor;
u16 num;
@@ -281,7 +293,7 @@ struct video_device
* __video_register_device - register video4linux devices
*
* @vdev: struct video_device to register
- * @type: type of device to register
+ * @type: type of device to register, as defined by &enum vfl_devnode_type
* @nr: which device node number is desired:
* (0 == /dev/video0, 1 == /dev/video1, ..., -1 == first free)
* @warn_if_nr_in_use: warn if the desired device node number
@@ -300,29 +312,22 @@ struct video_device
*
* Returns 0 on success.
*
- * Valid values for @type are:
- *
- * - %VFL_TYPE_GRABBER - A frame grabber
- * - %VFL_TYPE_VBI - Vertical blank data (undecoded)
- * - %VFL_TYPE_RADIO - A radio card
- * - %VFL_TYPE_SUBDEV - A subdevice
- * - %VFL_TYPE_SDR - Software Defined Radio
- * - %VFL_TYPE_TOUCH - A touch sensor
- *
* .. note::
*
* This function is meant to be used only inside the V4L2 core.
* Drivers should use video_register_device() or
* video_register_device_no_warn().
*/
-int __must_check __video_register_device(struct video_device *vdev, int type,
- int nr, int warn_if_nr_in_use, struct module *owner);
+int __must_check __video_register_device(struct video_device *vdev,
+ enum vfl_devnode_type type,
+ int nr, int warn_if_nr_in_use,
+ struct module *owner);
/**
* video_register_device - register video4linux devices
*
* @vdev: struct video_device to register
- * @type: type of device to register
+ * @type: type of device to register, as defined by &enum vfl_devnode_type
* @nr: which device node number is desired:
* (0 == /dev/video0, 1 == /dev/video1, ..., -1 == first free)
*
@@ -336,7 +341,8 @@ int __must_check __video_register_device(struct
video_device *vdev, int type,
* you video_device_release() should be called on failure.
*/
static inline int __must_check video_register_device(struct video_device *vdev,
- int type, int nr)
+ enum vfl_devnode_type type,
+ int nr)
{
return __video_register_device(vdev, type, nr, 1, vdev->fops->owner);
}
@@ -345,7 +351,7 @@ static inline int __must_check video_register_device(struct
video_device *vdev,
* video_register_device_no_warn - register video4linux devices
*
* @vdev: struct video_device to register
- * @type: type of device to register
+ * @type: type of device to register, as defined by &enum vfl_devnode_type
* @nr: which device node number is desired:
* (0 == /dev/video0, 1 == /dev/video1, ..., -1 == first free)
*
@@ -361,8 +367,9 @@ static inline int __must_check video_register_device(struct
video_device *vdev,
* is responsible for freeing any data. Usually that means that
* you video_device_release() should be called on failure.
*/
-static inline int __must_check video_register_device_no_warn(
- struct video_device *vdev, int type, int nr)
+static inline int __must_check
+video_register_device_no_warn(struct video_device *vdev,
+ enum vfl_devnode_type type, int nr)
{
return __video_register_device(vdev, type, nr, 0, vdev->fops->owner);
}
diff --git a/include/media/v4l2-mediabus.h b/include/media/v4l2-mediabus.h
index 47adb1608d98..3bfe6bcc8365 100644
--- a/include/media/v4l2-mediabus.h
+++ b/include/media/v4l2-mediabus.h
@@ -143,6 +143,13 @@ struct v4l2_mbus_config {
};
};
+/**
+ * v4l2_fill_pix_format - Ancillary routine that fills a &struct
+ * v4l2_pix_format fields from a &struct v4l2_mbus_framefmt.
+ *
+ * @pix_fmt: pointer to &struct v4l2_pix_format to be filled
+ * @mbus_fmt: pointer to &struct v4l2_mbus_framefmt to be used as model
+ */
static inline void v4l2_fill_pix_format(struct v4l2_pix_format *pix_fmt,
const struct v4l2_mbus_framefmt *mbus_fmt)
{
@@ -155,6 +162,15 @@ static inline void v4l2_fill_pix_format(struct
v4l2_pix_format *pix_fmt,
pix_fmt->xfer_func = mbus_fmt->xfer_func;
}
+/**
+ * v4l2_fill_pix_format - Ancillary routine that fills a &struct
+ * v4l2_mbus_framefmt from a &struct v4l2_pix_format and a
+ * data format code.
+ *
+ * @mbus_fmt: pointer to &struct v4l2_mbus_framefmt to be filled
+ * @pix_fmt: pointer to &struct v4l2_pix_format to be used as model
+ * @code: data format code (from &enum v4l2_mbus_pixelcode)
+ */
static inline void v4l2_fill_mbus_format(struct v4l2_mbus_framefmt *mbus_fmt,
const struct v4l2_pix_format *pix_fmt,
u32 code)
@@ -169,6 +185,13 @@ static inline void v4l2_fill_mbus_format(struct
v4l2_mbus_framefmt *mbus_fmt,
mbus_fmt->code = code;
}
+/**
+ * v4l2_fill_pix_format - Ancillary routine that fills a &struct
+ * v4l2_pix_format_mplane fields from a media bus structure.
+ *
+ * @pix_mp_fmt: pointer to &struct v4l2_pix_format_mplane to be filled
+ * @mbus_fmt: pointer to &struct v4l2_mbus_framefmt to be used as model
+ */
static inline void v4l2_fill_pix_format_mplane(
struct v4l2_pix_format_mplane *pix_mp_fmt,
const struct v4l2_mbus_framefmt *mbus_fmt)
@@ -182,6 +205,13 @@ static inline void v4l2_fill_pix_format_mplane(
pix_mp_fmt->xfer_func = mbus_fmt->xfer_func;
}
+/**
+ * v4l2_fill_pix_format - Ancillary routine that fills a &struct
+ * v4l2_mbus_framefmt from a &struct v4l2_pix_format_mplane.
+ *
+ * @mbus_fmt: pointer to &struct v4l2_mbus_framefmt to be filled
+ * @pix_mp_fmt: pointer to &struct v4l2_pix_format_mplane to be used as
model
+ */
static inline void v4l2_fill_mbus_format_mplane(
struct v4l2_mbus_framefmt *mbus_fmt,
const struct v4l2_pix_format_mplane *pix_mp_fmt)
--
2.13.6
