8/12/2019 Linux Driver Assignment9 Usb Febt2013

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Linux driver assignments USB drivers assignment 9

1. write a simple module that will search the entire system for all

available usb physical devices andprint their basic details a! vendor "#$product "#$ device speed and usb space

address %%%

b! no. of configurations$ no. of interfaces$ active configuration$ active interface of a configuration and no. of endpoints for a given active interface %%%

c! "n addition$ also identify the hub devices&root'hub as well!

which are also devices in a usb bus fabric.

d! also print the details of the associated driverbound to a given struct interface ( ) ob*ect

8/12/2019 Linux Driver Assignment9 Usb Febt2013

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Linux driver assignments USB drivers assignment 9

+his assignment will give you a hands on tour around the USB fabric representation$ in the usb subsystem

,ou can use usb-device-read&! of

/src0driversusbcoredevices.c as the base code and customi2e the code as needed %%% you must understand this code and also understand your re3uirements$ before you start coding %%%

4! also verify that the above information correct as per whatyou observe for the corresponding physical and logicaldevices under sysfs you must use information undersysbususbdevices compare information from sysfs$ with

"nformation generated by your code %%%

8/12/2019 Linux Driver Assignment9 Usb Febt2013

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Linux driver assignments USB drivers assignment 9

5! 6rite a module$ which uses the USBnotifier'chainframe'wor/ of Linux and detects addition of new devices$removal of devices$ addition of buses&hubs! andremoval of buses %%,ou can use chapter 7 of bootstrap USB for the basics

on notifier chain$ simple module suggested there and customi2e code given for our re3uirements %%%

' you must test for events$ during addition removal of devicesbuses by connecting and disconnecting deviceshubs %%%

' also print sufficient information about the detect devices buses$ in the notification handler %%%

8/12/2019 Linux Driver Assignment9 Usb Febt2013

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8ollowing eading is a must

' you must read ch15 of L##5 certain details are notin sync with current /ernel versions$ but basics arevery good %%%

' you must also read chapters :$7$;$9 and 1< ofbootstrap usb

' refer to custom-usb's/eleton4.c provided with comments %%%

' refer to the /ernel source files referred toby the above references and provided in lectures %%%

' relevant sections of part one $ five and six ofUSB system architecture =ind share publications %%%

8/12/2019 Linux Driver Assignment9 Usb Febt2013

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' you must read the relevant sections from usb 4.< specification forthe host$ when need this is normally mentioned in the

above references and /ernel source files %%%

' a good understanding of the usb'bus wor/ing is a prere3uisite forwriting usb device drivers %%%