I think the problem isn't usb device
The problem is serial protocol that don't have a plug and play feature
Em terça-feira, 23 de setembro de 2014, David Torrey <t...@woodsidelane.net>
escreveu:
> Does this help? Seems to be a lot more complicated than it should be, but
> at least it’s fairly deterministic.
>
>
> http://askubuntu.com/questions/184526/how-to-get-bus-and-device-relationship-for-a-dev-ttyusb
>
> Dave
>
> On Sep 23, 2014, at 7:58 PM, Paul Alfille <paul.alfi...@gmail.com
> <javascript:_e(%7B%7D,'cvml','paul.alfi...@gmail.com');>> wrote:
>
> Ok, I'm perplexed!
>
> I need help mapping device name (e.g. /dev/ttyUSB0) to USB bus:devnum that
> I get in libusb.
>
> I can probably do it by parsing 'dmesg' but that's rather inelegant.
> Perhaps the data is somewhere in /sys or /proc?
>
> The problem is that after searching (and perhaps tuning) USB devices, I
> then need to use them as a serial device.
> I need to go in both directions -- both to not open use a bus master twice
> and to check device names.
>
> Paul
>
> On Tue, Sep 23, 2014 at 5:37 PM, Dirk Opfer <d...@do13.de
> <javascript:_e(%7B%7D,'cvml','d...@do13.de');>> wrote:
>
>> Hi Paul,
>>
>> I have another one:
>>
>> Elabnet (PBM01) -- 0403:6015 -- with UNIQUE product and manufacture ID
>>
>> Sorry for the delay. I'm still negotiating a sample for your.
>>
>> Thanks
>> Dirk
>>
>> Am 23.09.2014 um 23:27 schrieb Paul Alfille:
>>
>> Ok, I did some testing of various USB 1-wire bus masters:
>>
>> LinkUSB -- 0403:6001 -- FTDI but no identifying charcteristics (Except
>> serial number, but that's probably not consecutive)
>> TAI603B -- 10c4:ea60 -- CP210x Unclear if it's generic or not
>> USB9097 --1a86:7523 -- HL-340 Seems generic
>> ECLO -- 0403:ea90 -- FTDI with UNIQUE product ID
>> MasterHub -- 04d8:f897 -- MTI with UNIQUE product ID
>> DS9490R -- 04fa:2490 -- Maxim with UNIQUE ID
>>
>> So it looks like only ECLO, the new Hobby Boards MasterHub, and the
>> DS9490R can be auto-detected by USB scanning. I had high hopes for the
>> LinkUSB, but perhaps I have an early version and the internal fields have
>> changed.
>>
>> Paul Alfille
>>
>>
>>
>>
>> On Tue, Sep 23, 2014 at 3:40 PM, Johan Ström <jo...@stromnet.se
>> <javascript:_e(%7B%7D,'cvml','jo...@stromnet.se');>> wrote:
>>
>>> I'm all for auto-detection, when it is possible to do so reliably. As
>>> you mentioned in the other reply, randomly poking at stuff is neither
>>> reliable or safe..
>>> So, the question is what we can do to make it as smooth for the user as
>>> possible..
>>>
>>> A possibly a new approach, with OS-specific resolving you mentioned:
>>>
>>> If user specifies --link /dev/ttyS0, -d /dev/ttyS0 or other, we could
>>> try OS-specific lookups to find what serial hardware it is using. For
>>> example, if we can find out that it is a FTDI based device, we could try to
>>> use ft_ftdi instead of ft_serial. If we cannot find out, we just fall back
>>> to regular TTY access.
>>>
>>> If user specifies --link 2:3, -d 3:4, --link usb:NNSERIAL or such, we
>>> look for that specific USB device. If it is a FTDI device, we use ft_ftdi.
>>> Else, we can either fail, or for device-types which are serial, we could
>>> try to reverse-lookup TTY using OS-specific approach.
>>>
>>> Note: on FreeBSD there are separate /dev permissions for accessing the
>>> TTY and the USB device. Not sure if Linux has the same.
>>>
>>> Or, a more intrusive approach, clean up all parameters and go a generic
>>> device-option: --device <type>[ <port-or-address>].
>>> Examples:
>>> --device link /dev/ttyS0 (would also possibly try to use OS specific
>>> resolving)
>>> --device link usb:3:4
>>> --device link usb:NNSERIAL
>>> --device ds9097 /dev/ttyS0
>>> --device ds9097 usb:3:4
>>> --device ds9097 usb:NNSERIAL
>>> --device ds9097u /dev/ttyS0
>>> --device i2c /dev/i2c-0
>>> --device masterhub /dev/ttyS0
>>> --device usb (this would search for DS9490R or
>>> PuceBaboon or any other USb which we can *reliably* identify)
>>>
>>> What would your optimal owfs usage model look like?
>>>
>>>
>>> For the record, here are the usbconfig --dump_device_desc data for my
>>> two FTDI devices:
>>>
>>> ugen1.3: <FT232R USB UART FTDI> at usbus1, cfg=0 md=HOST spd=FULL
>>> (12Mbps) pwr=ON (90mA)
>>> bLength = 0x0012
>>> bDescriptorType = 0x0001
>>> bcdUSB = 0x0200
>>> bDeviceClass = 0x0000
>>> bDeviceSubClass = 0x0000
>>> bDeviceProtocol = 0x0000
>>> bMaxPacketSize0 = 0x0008
>>> idVendor = 0x0403
>>> idProduct = 0x6001
>>> bcdDevice = 0x0600
>>> iManufacturer = 0x0001 <FTDI>
>>> iProduct = 0x0002 <FT232R USB UART>
>>> iSerialNumber = 0x0003 <A9xxxxxD>
>>> bNumConfigurations = 0x0001
>>>
>>> ugen2.3: <USB FAST SERIAL ADAPTER FTDI> at usbus2, cfg=0 md=HOST
>>> spd=FULL (12Mbps) pwr=ON (44mA)
>>> bcdUSB = 0x0110
>>> bcdDevice = 0x0400
>>> iManufacturer = 0x0001 <FTDI>
>>> iProduct = 0x0002 <USB FAST SERIAL ADAPTER>
>>> iSerialNumber = 0x0003 <FTCDXXX>
>>> (skipped all other attributes which are identical)
>>>
>>>
>>>
>>> Johan
>>>
>>>
>>> On 9/22/14 18:23 , Paul Alfille wrote:
>>>
>>> I notice in recent Linux (Fedora specifically) that USB devices get
>>> pretty consistently listed by a reasonably consistent and recognizable name
>>> in /dev/serial/by_id.
>>>
>>> I haven't looked to closely at all the USB fields yet, but some
>>> devices have unique identifiers rather than the generic USB/serial. I was
>>> hoping to scan for known patterns, apply any optimizations, and then
>>> connect. The upcoming USB HobbyBoards hub will have that.
>>>
>>> My dream is that owfs will be as "automatic" as possible. Currently we
>>> can automatically scan for:
>>> i2c
>>> DS9490R
>>> HA7Net
>>> OWSERVER-ENET
>>> w1
>>>
>>> Hardware serial will always be a problem, but some USB-serial might be
>>> possible.
>>>
>>> Paul
>>>
>>> On Mon, Sep 22, 2014 at 2:59 AM, Johan Ström <jo...@stromnet.se
>>> <javascript:_e(%7B%7D,'cvml','jo...@stromnet.se');>> wrote:
>>>
>>>>
>>>> On 22/09/14 00:21, Robin Gilks wrote:
>>>> >> 1. Trying to resolve a serial port TTY name (i.e. /dev/cuaU1 on
>>>> FreeBSD)
>>>> >> to a potential USB device is probably doable, but not without a lot
>>>> of
>>>> >> effort and OS specific code.
>>>> >> I don't think it's worth trying to go down that road.
>>>> >>
>>>> > How about using udev on Linux (is there an equivalent on other OSes?)
>>>> that
>>>> > creates a symlink to a device node with a unique name from the type
>>>> (FTDI)
>>>> > and bus number and OWFS looks for that specific device name.
>>>> >
>>>> > Just an idea (had to do that years ago with serial devices to sort
>>>> out a
>>>> > connection to a weather station and an IR blaster, never sure what
>>>> device
>>>> > names each would come up with!).
>>>> >
>>>> >
>>>>
>>>> I have a similar setup myself, using FreeBSD's devd. It uses my known,
>>>> hard-coded USB serials to set up a symlink from /dev/cua-linkusb to
>>>> /dev/cuaXXX when device is detected, to easier find which tty device I
>>>> should be using for what (I think I have ~4 serial ports on my box)
>>>>
>>>> However, this doesn't solve the auto-deteciton problem, the user still
>>>> needs to manually tell which USB device to be used, by serial-no or
>>>> otherwise. And if that has to be done, it could just as well be done
>>>> directly in owfs.
>>>>
>>>>
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>>>
>>>
>>>
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>>>
>>>
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>>>
>>
>>
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>>
>>
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>>
>>
>>
>>
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>>
>
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--
Roberto Spadim
SPAEmpresarial
Eng. Automação e Controle
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