Hdrc H12

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Argenta Sugden

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Aug 3, 2024, 10:13:55 AM8/3/24

to limusneckdiff

First, i am new to the Linux USB stack and i am trying to understand it a little bit more in order to achieve the following result : i need to reconnect/disconnect a specific USB device because sometimes, tough not often, this device does not respond anymore and the only solution is to physically disconnect/reconnect the USB cable from the device.

However, when i do the same procedure using musb-hdrc driver on musb-hdrc.1.auto and musb-hdrc.0.auto devices, it works well except that all my usb devices are turned off/on...and i would like to be more specific about the 2-1.4:1.0 usb devices interface.

Why the unbind command say that the device does not exist then ? Maybe there is a way to indicate, a kind of path inside the device tree to indicate to the driver that i want to unbind to this specific device interface 2-1.4:1.0 ?

First of all, keep in mind that there is a difference between a (logical) Device and a Device Driver. When a hardware device is physically connected, Linux creates a (logical) device instance and then tries to bind the device to a matching device driver instance.

After some research, I found a USBDEVFS_RESET ioctl, but there is a warning that suggests to avoid it. In any case, other people have found it useful. The post mentions the authorized interface as a way to re-configure the device, through an auth cycle:

I would like to use a USB gadget device (phone) as a host via configfs. After setting up configfs, no gadget is being set up on the host peripheral (phone). The init script executes with the following result

I feel like there is something else I am not setting up in the tree to get the musb-hdrc driver to load so that a UDC device is found. Contents of the node in /sys/devices/platform/11200000.usb are as follows

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