Access pci devices' serial numbers programmatically

[Nomad Esst]

Thank you. The thing is one of the input arguments of this function is device_t. How can I get this struct by device name so I can pass it to pci_get_vpd_readonly function?
>Consider that I'm trying to read em's vpd, how can get em's related device_t struct by it's name? 
>Something like:
>device_t get_device_by_name(char dev_name)
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>On Monday, January 13, 2014 11:49 PM, John Baldwin <jhb at freebsd.org> wrote:
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>On Sunday, January 12, 2014 3:32:25 am Nomad Esst wrote:
>>> Hi list
>>> Any experiences on how to do so? Please tell me if you know how can I do 
>>that?
>>
>>There are methods available to query VPD data in dev/pci/pcivar.h if the
>>serial number is stored in VPD (specifically you can call 
>>pci_get_vpd_readonly()).
>>
>>-- 
>>John Baldwin
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