Introduction Characteristics of USB System Model What needs to be done Platform Issues Conceptual Issues Timeline USB Monitoring Update – 6 th December 2000 David Harding Front page Introduction System Model Progress so far Initial Kernel interface Revised kernel Interface Topology Interface Data Interface Remaining Issues Original Timeline Timeline Issues

Introduction Characteristics of USB System Model What needs to be done Platform Issues Conceptual Issues Timeline USB System Model Host computer Hub Camera Keyboard CD-ROM Scanner Printer Host controller driver Modified USB core DD Host OS Debug Information Monitoring Application Introduction System Model Progress so far Initial Kernel interface Revised kernel Interface Topology Interface Data Interface Remaining Issues Original Timeline Timeline Issues

Introduction Characteristics of USB System Model What needs to be done Platform Issues Conceptual Issues Timeline Progress Much greater understanding of how the USB part of the Linux kernel works. Learnt about the mechanics of kernel communication. (/proc and system calls) Written my first kernel module. Researched suitability of Java vs. Gtk for the GUI. Interface design for the kernel part of the project. Partial Code Design for kernel code. Introduction System Model Progress so far Initial Kernel interface Revised kernel Interface Topology Interface Data Interface Remaining Issues Original Timeline Timeline Issues

Introduction Characteristics of USB System Model What needs to be done Platform Issues Conceptual Issues Timeline Host controller driver Modified USB core DD Host OS Debug Information Monitoring Application All information through one ‘channel’ Initial Design Introduction System Model Progress so far Initial Kernel interface Revised kernel Interface Topology Interface Data Interface Remaining Issues Original Timeline Timeline Issues

Introduction Characteristics of USB System Model What needs to be done Platform Issues Conceptual Issues Timeline Host controller driver Modified USB core DD Host OS Debug Information Monitoring Application Use existing Configuration Channel, and create new Data channel Revised Design /proc/bus/usb/devicesNew /proc file Just data transfers New system calla Introduction System Model Progress so far Initial Kernel interface Revised kernel Interface Topology Interface Data Interface Remaining Issues Original Timeline Timeline Issues

Introduction Characteristics of USB System Model What needs to be done Platform Issues Conceptual Issues Timeline New system calla Host controller driver Modified USB core DD Host OS Debug Information Monitoring Application Use existing Configuration Channel, and create new Data channel Revised Design /proc/bus/usb/devices Just data transfers T: Bus=00 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 B: Alloc= 28/900 us ( 3%), #Int= 2, #Iso= 0 D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 0.00 C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms T: Bus=00 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=12 MxCh= 4 D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0451 ProdID=1446 Rev= 1.00 C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 1 Ivl=255ms T: Bus=00 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#= 3 Spd=12 MxCh= 0 D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0553 ProdID=0002 Rev= 1.00 C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=400mA I: If#= 1 Alt= 0 #EPs= 1 Cls=ff(vend.) Sub=00 Prot=ff Driver=cpia E: Ad=81(I) Atr=01(Isoc) MxPS= 0 Ivl= 1ms I: If#= 1 Alt= 1 #EPs= 1 Cls=ff(vend.) Sub=00 Prot=ff Driver=cpia E: Ad=81(I) Atr=01(Isoc) MxPS= 448 Ivl= 1ms I: If#= 1 Alt= 2 #EPs= 1 Cls=ff(vend.) Sub=00 Prot=ff Driver=cpia E: Ad=81(I) Atr=01(Isoc) MxPS= 704 Ivl= 1ms I: If#= 1 Alt= 3 #EPs= 1 Cls=ff(vend.) Sub=00 Prot=ff Driver=cpia E: Ad=81(I) Atr=01(Isoc) MxPS= 960 Ivl= 1ms T: Bus=00 Lev=02 Prnt=02 Port=02 Cnt=02 Dev#= 5 Spd=1.5 MxCh= 0 D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=046d ProdID=c001 Rev= 1.10 S: Manufacturer=Logitech S: Product=USB-PS/2 Mouse /proc/bus/usb/devices New /proc file Introduction System Model Progress so far Initial Kernel interface Revised kernel Interface Topology Interface Data Interface Remaining Issues Original Timeline Timeline Issues

Introduction Characteristics of USB System Model What needs to be done Platform Issues Conceptual Issues Timeline Host controller driver Modified USB core DD Host OS Debug Information Monitoring Application Use existing Configuration Channel, and create new Data channel Revised Design /proc/bus/usb/devicesNew /proc file Just data transfers New system calla Introduction System Model Progress so far Initial Kernel interface Revised kernel Interface Topology Interface Data Interface Remaining Issues Original Timeline Timeline Issues

Introduction Characteristics of USB System Model What needs to be done Platform Issues Conceptual Issues Timeline Host controller driver Modified USB core DD Host OS Debug Information Monitoring Application Use existing Configuration Channel, and create new Data channel Revised Design /proc/bus/usb/devices Just data transfers /proc/bus/usb/????? New system calla All data is transmitted in structures called URBs The header information for all URBs will be sent here from the kernel. The actual data for URBs belonging to requested devices will also be sent here New /proc file Introduction System Model Progress so far Initial Kernel interface Revised kernel Interface Topology Interface Data Interface Remaining Issues Original Timeline Timeline Issues

Introduction Characteristics of USB System Model What needs to be done Platform Issues Conceptual Issues Timeline Remaining Issues How to maintain a list in the kernel of which devices need their data sent to the application. How to create a kernel patch. Gtk vs. Java GUI Active Device Interrogation – probably involves writing a generic hotplugable device driver. Introduction System Model Progress so far Initial Kernel interface Revised kernel Interface Topology Interface Data Interface Remaining Issues Original Timeline Timeline Issues

Introduction Characteristics of USB System Model What needs to be done Platform Issues Conceptual Issues Timeline Original Timeline Term 1, Week 1 - Start Term 1, Week 4 - working USB kernel Term 1, Week 6 - Defined interface between core and application Term 1, Week 10 - Working core code Term 2, Week 3 - bus-topology display Term 2, Week 6 - full monitoring Term 2, Week 9 - active device interrogation Term 3, Week 2 - Begin final write up Introduction System Model Progress so far Initial Kernel interface Revised kernel Interface Topology Interface Data Interface Remaining Issues Original Timeline Timeline Issues

Introduction Characteristics of USB System Model What needs to be done Platform Issues Conceptual Issues Timeline Timeline Issues Some slippage – Defining the kernel interface has taken longer than expected. However writing the kernel code should take less time than planned. Must choose either Java or Gtk before next term. The implementation and testing of the kernel code is unaffected by this decision. Introduction System Model Progress so far Initial Kernel interface Revised kernel Interface Topology Interface Data Interface Remaining Issues Original Timeline Timeline Issues