On 09/10/17 12:19, Mauro Carvalho Chehab wrote:
> 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 <mchehab@xxxxxxxxxxxxxxxx>
Acked-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Regards,
Hans
> ---
> 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)
>
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