On 04/10/2018 01:00 PM, Sakari Ailus wrote:
> On Tue, Apr 10, 2018 at 06:38:56AM -0300, Mauro Carvalho Chehab wrote:
>> Em Mon, 9 Apr 2018 16:19:59 +0200
>> Hans Verkuil <hverk...@xs4all.nl> escreveu:
>>
>>> From: Hans Verkuil <hans.verk...@cisco.com>
>>>
>>> Define the public request API.
>>>
>>> This adds the new MEDIA_IOC_REQUEST_ALLOC ioctl to allocate a request
>>> and two ioctls that operate on a request in order to queue the
>>> contents of the request to the driver and to re-initialize the
>>> request.
>>>
>>> Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
>>> ---
>>> include/uapi/linux/media.h | 8 ++++++++
>>> 1 file changed, 8 insertions(+)
>>>
>>> diff --git a/include/uapi/linux/media.h b/include/uapi/linux/media.h
>>> index c7e9a5cba24e..f8769e74f847 100644
>>> --- a/include/uapi/linux/media.h
>>> +++ b/include/uapi/linux/media.h
>>> @@ -342,11 +342,19 @@ struct media_v2_topology {
>>>
>>> /* ioctls */
>>>
>>> +struct __attribute__ ((packed)) media_request_alloc {
>>> + __s32 fd;
>>> +};
>>> +
>>> #define MEDIA_IOC_DEVICE_INFO _IOWR('|', 0x00, struct
>>> media_device_info)
>>> #define MEDIA_IOC_ENUM_ENTITIES _IOWR('|', 0x01, struct
>>> media_entity_desc)
>>> #define MEDIA_IOC_ENUM_LINKS _IOWR('|', 0x02, struct
>>> media_links_enum)
>>> #define MEDIA_IOC_SETUP_LINK _IOWR('|', 0x03, struct media_link_desc)
>>> #define MEDIA_IOC_G_TOPOLOGY _IOWR('|', 0x04, struct
>>> media_v2_topology)
>>> +#define MEDIA_IOC_REQUEST_ALLOC _IOWR('|', 0x05, struct
>>> media_request_alloc)
>>> +
>>
>> Why use a struct here? Just declare it as:
>>
>> #define MEDIA_IOC_REQUEST_ALLOC _IOWR('|', 0x05, int)
>
> I'd say it's easier to extend it if it's a struct. All other IOCTLs also
> have a struct as an argument. As a struct member, the parameter (fd) also
> has a name; this is a plus.
While I do not have a very strong opinion on this, I do agree with Sakari here.
Regards,
Hans
>
>>
>>> +#define MEDIA_REQUEST_IOC_QUEUE _IO('|', 0x80)
>>> +#define MEDIA_REQUEST_IOC_REINIT _IO('|', 0x81)
>>>
>>> #if !defined(__KERNEL__) || defined(__NEED_MEDIA_LEGACY_API)
>>>
>>
>> Thanks,
>> Mauro
>
