firewire: new driver: nosy - IEEE 1394 traffic sniffer

This adds the traffic sniffer driver for Texas Instruments PCILynx/
PCILynx2 based cards.  The use cases for nosy are analysis of
nonstandard protocols and as an aid in development of drivers,
applications, or firmwares.

Author of the driver is Kristian Høgsberg.  Known contributers are
Jody McIntyre and Jonathan Woithe.

Nosy programs PCILynx chips to operate in promiscuous mode, which is a
feature that is not found in OHCI-1394 controllers.  Hence, only special
hardware as mentioned in the Kconfig help text is suitable for nosy.

This is only the kernelspace part of nosy.  There is a userspace
interface to it, called nosy-dump, proposed to be added into the tools/
subdirectory of the kernel sources in a subsequent change.  Kernelspace
and userspave component of nosy communicate via a 'misc' character
device file called /dev/nosy with a simple ioctl() and read() based
protocol, as described by nosy-user.h.

The files added here are taken from
git://anongit.freedesktop.org/~krh/nosy commit ee29be97 (2009-11-10)
with the following changes by Stefan Richter:
  - Kconfig and Makefile hunks are written from scratch.
  - Commented out version printk in nosy.c.
  - Included missing <linux/sched.h>, reported by Stephen Rothwell.

"git shortlog nosy{-user.h,.c,.h}" from nosy's git repository:

Jonathan Woithe (2):
      Nosy updates for recent kernels
      Fix uninitialised memory (needed for 2.6.31 kernel)

Kristian Høgsberg (5):
      Pull over nosy from mercurial repo.
      Use a misc device instead.
      Add simple AV/C decoder.
      Don't break down on big payloads.
      Set parent device for misc device.

As a low-level IEEE 1394 driver, its files are placed into
drivers/firewire/ although nosy is not part of the firewire driver
stack.

I am aware of the following literature from Texas Instruments about
PCILynx programming:
      SCPA020A - PCILynx 1394 to PCI Bus Interface TSB12LV21BPGF
                 Functional Specification
      SLLA023  - Initialization and Asynchronous Programming of the
                 TSB12LV21A 1394 Device
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Acked-by: Kristian Høgsberg <krh@bitplanet.net>

drivers/firewire/Kconfig

@@ -66,4 +66,27 @@ config FIREWIRE_NET
 
 source "drivers/ieee1394/Kconfig"
 
+config FIREWIRE_NOSY
+	tristate "Nosy - a FireWire traffic sniffer for PCILynx cards"
+	depends on PCI
+	help
+	  Nosy is an IEEE 1394 packet sniffer that is used for protocol
+	  analysis and in development of IEEE 1394 drivers, applications,
+	  or firmwares.
+
+	  This driver lets you use a Texas Instruments PCILynx 1394 to PCI
+	  link layer controller TSB12LV21/A/B as a low-budget bus analyzer.
+	  PCILynx is a nowadays very rare IEEE 1394 controller which is
+	  not OHCI 1394 compliant.
+
+	  The following cards are known to be based on PCILynx or PCILynx-2:
+	  IOI IOI-1394TT (PCI card), Unibrain Fireboard 400 PCI Lynx-2
+	  (PCI card), Newer Technology FireWire 2 Go (CardBus card),
+	  Apple Power Mac G3 blue & white (onboard controller).
+
+	  To compile this driver as a module, say M here:  The module will be
+	  called nosy.
+
+	  If unsure, say N.
+
 endmenu

drivers/firewire/Makefile

@@ -12,3 +12,4 @@ obj-$(CONFIG_FIREWIRE)      += firewire-core.o
 obj-$(CONFIG_FIREWIRE_OHCI) += firewire-ohci.o
 obj-$(CONFIG_FIREWIRE_SBP2) += firewire-sbp2.o
 obj-$(CONFIG_FIREWIRE_NET)  += firewire-net.o
+obj-$(CONFIG_FIREWIRE_NOSY) += nosy.o

drivers/firewire/nosy-user.h

+#ifndef __nosy_user_h
+#define __nosy_user_h
+
+#include <asm/ioctl.h>
+#include <asm/types.h>
+
+#define NOSY_IOC_GET_STATS _IOR('&', 0, struct nosy_stats)
+#define NOSY_IOC_START     _IO('&', 1)
+#define NOSY_IOC_STOP      _IO('&', 2)
+#define NOSY_IOC_FILTER    _IOW('&', 2, __u32)
+
+struct nosy_stats {
+  __u32 total_packet_count;
+  __u32 lost_packet_count;
+};
+
+/* 
+ * Format of packets returned from the kernel driver:
+ *
+ *   quadlet with timestamp (microseconds)
+ *   quadlet padded packet data...
+ *   quadlet with ack
+ */
+
+#endif /* __nosy_user_h */