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Do you even know what USB IDs are ? You can not identify an USB device without them.

by Faaak 8y ago

IshKebab 8y ago
Yes you can. On Mac you can use userspace USB drivers by default so you can use any other method to identify your device. On Windows you can use WCID to get it to automatically install WinUSB (Windows' userspace USB driver) irrespective of the product / vendor ID. On Linux I believe you just have to set up some udev rule and then you can use libusb. Once you have userspace access there's basically no downside to squatting. The only minor one is if you happen to squat on an ID that also happens to have a kernel driver. But just pick a long defunct vendor and that's pretty damn unlikely.
- cesarb 8y ago
  As Raymond Chen would say, what if two devices did this? Suppose you have Widget A, which is squatting on ID 1234:5678, and Widget B, which is also squatting on ID 1234:5678. You plug both on the same computer. How would the driver, no matter whether kernel or userspace, know a newly plugged device with that ID is Widget A and not Widget B?
  - Kliment 8y ago
    That's an argument for coordination between squatters, not against squatting.
    - otterlicious 8y ago
      Maybe they should start some sort of USB Implementers Forum to coordinate or something...
simias 8y ago
What's stupid is that USB IDs should have a large enough range that allocation wouldn't have to be centralized and monetized. Something like a UUID. I doubt the overhead would be significant enough to justify saving a few bytes. This is artificial scarcity.
trasz 8y ago
Sure you can - you can look at the manufacturer / product strings. And for standard device classes (eg mass storage or CDC ACM, aka USB serial) you can just use interface descriptors to identify them. Would be nice if more systems used the strings embedded in the device, like eg FreeBSD does, instead of looking up PID/VID in a static table.
- vetinari 8y ago
  > Sure you can - you can look at the manufacturer / product strings. Sure, you can. Does not mean that the vendors will. If I had a dollar for each board identifying itself as "To be filled by O.E.M."...

Do you even know what USB IDs are ? You can not identify an USB device without them.

by Faaak 8y ago

Do you even know what USB IDs are ? You can not identify an USB device without them.

Yes you can. On Mac you can use userspace USB drivers by default so you can use any other method to identify your device. On Windows you can use WCID to get it to automatically install WinUSB (Windows' userspace USB driver) irrespective of the product / vendor ID. On Linux I believe you just have to set up some udev rule and then you can use libusb. Once you have userspace access there's basically no downside to squatting. The only minor one is if you happen to squat on an ID that also happens to have a kernel driver. But just pick a long defunct vendor and that's pretty damn unlikely.

cesarb 8y ago
As Raymond Chen would say, what if two devices did this? Suppose you have Widget A, which is squatting on ID 1234:5678, and Widget B, which is also squatting on ID 1234:5678. You plug both on the same computer. How would the driver, no matter whether kernel or userspace, know a newly plugged device with that ID is Widget A and not Widget B?
- Kliment 8y ago
  That's an argument for coordination between squatters, not against squatting.
  - otterlicious 8y ago
    Maybe they should start some sort of USB Implementers Forum to coordinate or something...

simias 8y ago

What's stupid is that USB IDs should have a large enough range that allocation wouldn't have to be centralized and monetized. Something like a UUID. I doubt the overhead would be significant enough to justify saving a few bytes. This is artificial scarcity.

trasz 8y ago

Sure you can - you can look at the manufacturer / product strings. And for standard device classes (eg mass storage or CDC ACM, aka USB serial) you can just use interface descriptors to identify them. Would be nice if more systems used the strings embedded in the device, like eg FreeBSD does, instead of looking up PID/VID in a static table.

vetinari 8y ago
> Sure you can - you can look at the manufacturer / product strings. Sure, you can. Does not mean that the vendors will. If I had a dollar for each board identifying itself as "To be filled by O.E.M."...