[Xenomai] Xenomai RTDM Driver /dev/ Population

[Xenomai] Xenomai RTDM Driver /dev/ Population

[Poole Jr, Donald R.]

Hello All,

I'm currently writing a driver using the Xenomai RTDM API, but had a question regarding where in the /dev/ hierarchy the driver gets instantiated.  When I do an ls –l on the /dev/ folder.  I don't see my driver listed  below is my device structure:

static struct rtdm_device gpe_device = {
    .struct_version = RTDM_DEVICE_STRUCT_VER,

    .device_flags = RTDM_NAMED_DEVICE,
    .context_size = sizeof(context_t),
    .device_name = DEVICE_NAME,

    .open_nrt = pwm_rtdm_open_nrt,

    .ops = {
        .close_nrt = pwm_rtdm_close_nrt,
        .read_nrt = pwm_rtdm_read_nrt,
        .write_nrt = pwm_rtdm_write_nrt,
    },

    .device_class = RTDM_CLASS_EXPERIMENTAL,
    .device_sub_class = SOME_SUB_CLASS,
    .profile_version = 1,
    .driver_name = "GPE",
    .driver_version = RTDM_DRIVER_VER(0, 1, 2),
    .peripheral_name = "GPIO PWM Engine (GPE)",
    .provider_name = "Donald R. Poole, Jr.",
    .proc_name = gpe_device.device_name,
};

Could anyone point me in the right direction to see what it is that I might be doing wrong? Thanks in advance.

Thanks,
Donald R. Poole, Jr.
Research Engineer
Voice: 210.522.3131 | Fax: 210.522.4931
Tactical Networks & Communications (tacticalnetworks.swri.org)
Southwest Research Institute (SwRI)

Re: [Xenomai] Xenomai RTDM Driver /dev/ Population

[Jan Kiszka]

On 2013-01-28 15:52, Poole Jr, Donald R. wrote:
> Hello All,
> 
> I'm currently writing a driver using the Xenomai RTDM API, but had a question regarding where in the /dev/ hierarchy the driver gets instantiated.  When I do an ls –l on the /dev/ folder.  I don't see my driver listed  below is my device structure:
> 
> static struct rtdm_device gpe_device = {
>     .struct_version = RTDM_DEVICE_STRUCT_VER,
> 
>     .device_flags = RTDM_NAMED_DEVICE,
>     .context_size = sizeof(context_t),
>     .device_name = DEVICE_NAME,
> 
>     .open_nrt = pwm_rtdm_open_nrt,
> 
>     .ops = {
>         .close_nrt = pwm_rtdm_close_nrt,
>         .read_nrt = pwm_rtdm_read_nrt,
>         .write_nrt = pwm_rtdm_write_nrt,
>     },
> 
>     .device_class = RTDM_CLASS_EXPERIMENTAL,
>     .device_sub_class = SOME_SUB_CLASS,
>     .profile_version = 1,
>     .driver_name = "GPE",
>     .driver_version = RTDM_DRIVER_VER(0, 1, 2),
>     .peripheral_name = "GPIO PWM Engine (GPE)",
>     .provider_name = "Donald R. Poole, Jr.",
>     .proc_name = gpe_device.device_name,
> };
> 
> Could anyone point me in the right direction to see what it is that I might be doing wrong? Thanks in advance.

RTDM devices aren't registered with the Linux VFS layer. They live in
their own space, managed by Xenomai, addressable via Native's
rt_dev_open or the wrapped POSIX open call. The POSIX skin allows you to
address them as "/dev/mydevice" as well, but it acutally cuts "/dev/"
off before doing the open via RTDM.

Check /proc/xenomai/rtdm/named_devices to see if your device was registered.

Jan

-- 
Siemens AG, Corporate Technology, CT RTC ITP SDP-DE
Corporate Competence Center Embedded Linux

Re: [Xenomai] Xenomai RTDM Driver /dev/ Population

[Poole Jr, Donald R.]

Thanks Jan for clarifying this for me.  Where in the documentation does it
make mention of this?

Donald R. Poole, Jr.
Research Engineer
Voice: 210.522.3131 | Fax: 210.522.4931
Tactical Networks & Communications (tacticalnetworks.swri.org)
Southwest Research Institute (SwRI)




On 1/28/13 9:14 AM, "Jan Kiszka" <jan.kiszka@siemens.com> wrote:

>On 2013-01-28 15:52, Poole Jr, Donald R. wrote:
>> Hello All,
>> 
>> I'm currently writing a driver using the Xenomai RTDM API, but had a
>>question regarding where in the /dev/ hierarchy the driver gets
>>instantiated.  When I do an ls ­l on the /dev/ folder.  I don't see my
>>driver listed  below is my device structure:
>> 
>> static struct rtdm_device gpe_device = {
>>     .struct_version = RTDM_DEVICE_STRUCT_VER,
>> 
>>     .device_flags = RTDM_NAMED_DEVICE,
>>     .context_size = sizeof(context_t),
>>     .device_name = DEVICE_NAME,
>> 
>>     .open_nrt = pwm_rtdm_open_nrt,
>> 
>>     .ops = {
>>         .close_nrt = pwm_rtdm_close_nrt,
>>         .read_nrt = pwm_rtdm_read_nrt,
>>         .write_nrt = pwm_rtdm_write_nrt,
>>     },
>> 
>>     .device_class = RTDM_CLASS_EXPERIMENTAL,
>>     .device_sub_class = SOME_SUB_CLASS,
>>     .profile_version = 1,
>>     .driver_name = "GPE",
>>     .driver_version = RTDM_DRIVER_VER(0, 1, 2),
>>     .peripheral_name = "GPIO PWM Engine (GPE)",
>>     .provider_name = "Donald R. Poole, Jr.",
>>     .proc_name = gpe_device.device_name,
>> };
>> 
>> Could anyone point me in the right direction to see what it is that I
>>might be doing wrong? Thanks in advance.
>
>RTDM devices aren't registered with the Linux VFS layer. They live in
>their own space, managed by Xenomai, addressable via Native's
>rt_dev_open or the wrapped POSIX open call. The POSIX skin allows you to
>address them as "/dev/mydevice" as well, but it acutally cuts "/dev/"
>off before doing the open via RTDM.
>
>Check /proc/xenomai/rtdm/named_devices to see if your device was
>registered.
>
>Jan
>
>-- 
>Siemens AG, Corporate Technology, CT RTC ITP SDP-DE
>Corporate Competence Center Embedded Linux

Re: [Xenomai] Xenomai RTDM Driver /dev/ Population

[Jan Kiszka]

On 2013-01-28 17:05, Poole Jr, Donald R. wrote:
> Thanks Jan for clarifying this for me.  Where in the documentation does it
> make mention of this?

Check doc/nodist/pdf/RTDM-and-Applications.pdf, though I'm not sure
anymore if it was state there that explicitly.

Jan

-- 
Siemens AG, Corporate Technology, CT RTC ITP SDP-DE
Corporate Competence Center Embedded Linux