Make USB device config public #69
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ryan-summers
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Apr 8, 2023
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| pub struct Config<'a> { | ||
| /// USB device class | ||
| pub device_class: u8, | ||
| /// USB device subclass | ||
| pub device_sub_class: u8, | ||
| /// USB device protocol | ||
| pub device_protocol: u8, | ||
| /// USB control endpoint maximum packet size | ||
| pub max_packet_size_0: u8, | ||
| /// USB vendor ID | ||
| pub vendor_id: u16, | ||
| /// USB product ID | ||
| pub product_id: u16, | ||
| /// BCD encoded device release | ||
| pub device_release: u16, | ||
| /// Manufacturer string | ||
| pub manufacturer: Option<&'a str>, | ||
| /// Product string | ||
| pub product: Option<&'a str>, | ||
| /// Serial number | ||
| pub serial_number: Option<&'a str>, | ||
| /// Is device self-powered? | ||
| pub self_powered: bool, | ||
| /// Does device support remote wakeup? | ||
| pub supports_remote_wakeup: bool, | ||
| /// Is device composite with IADs? | ||
| pub composite_with_iads: bool, | ||
| /// Maximum power consumption of device | ||
| pub max_power: u8, | ||
| } |
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As much as I like the builder semantics, making struct fields public is problematic . See https://rust-lang.github.io/api-guidelines/future-proofing.html#structs-have-private-fields-c-struct-private for a discussion on why this is problematic for a maintainability perspective.
Other than that, I like the builder config API
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I was about to start tackling USB/IP when I discovered @Sawchord's https://github.com/Sawchord/usbip-device.
For
usbip list -r localhostto be somewhat pretty, the USB/IP server should return basic info on the device, which duplicates the contents of the non-publicConfigstruct here. (It's not strictly necessary for this info to be correct, AFAIU.)Looking at UsbDeviceBuilder, in reality it's a ConfigBuilder, which would become quite redundant (candidate for deprecation?) if the config itself were made public with a fluent/builder interface. I'm gambling on increasing merge/publish potential by staying backwards compatible though :)
This would then allow re-use in the USB/IP driver (e.g. https://github.com/nickray/usbip-device/blob/7bab96f64072da82a552c94213b5dc98f2481c99/examples/twitching_mouse.rs#L16-L26)
There's a bit chicken+egg involved regarding DRY and the interface descriptors (which USB/IP also advertises); solving that seems it would require breaking changes which I don't want to propose.
P.S. Are there any/many useful cases for
Config<'a>with non-'staticlifetimes?