Hi Prasanna, On Fri, May 25, 2012 at 11:51 AM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > That's a different type of question, have you read documentation like > the "Linux Device Drivers" book already? It is free online and should > answer things like this. > >> How the device file to physical device mapping magic works? > > Squirrels are involved in creating the magic. :) > > No, seriously, go look up the above mentioned book, it should help > explain things better. > > greg k-h If you want to start USB from scratch try reading the book "Linux Device Drivers" its a nice book. Also try reading the USB specifications 2.0,3.0 whichever protocol you want to understand the code. The Host Controller Specification Of EHCI (if working on USB protocol2.0) and xHCI (If working on USB 3.0 protocol) is also beneficial in understanding concepts, the USB maintainers have carefully followed the USB specification so reading the specification you will be able to understand the code better. I also recommend you to read the book called "Programming Guide for Linux USB Device Drivers By Detlef Fliegl" it is a freely available book. I would recommend you to visit the following websites, 1.http://www.cnx-software.com/2012/03/02/free-electrons-releases-embedded-linux-training-materials/ This website contains all the details if you want start an embedded USB based Project. 2.http://www.usbmadesimple.co.uk/ This website contains all the details and information about USB protocol and its implementation. Also try to read following books for in-depth knowledge about USB. 1. Bootstrap Yourself with Linux-USB Stack:Design, Develop, Debug, and Validate Embedded USB By Rajaram Regupathy 2. USB Complete: The Developer’s Guide, Fourth Edition by Jan Axelson 3. USB Multi-Role Device Design By Example John Hyde (Freely avalible). The first two books are not freely available. :( . If you are a college student it will be available in library. :). Last but not the least try to read the Linux kernel documentation available in the source code. I think it is not too much information i have given. :) Sorry if you have done all this, i just wanted to share and help people. :) -- Regards, Anil Nair -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
