nosy_start/stop_snoop() are always only called by the ioctl method, i.e.
with IRQs enabled.  packet_handler() and bus_reset_handler() are always
only called by the IRQ handler.  Hence neither one needs to track IRQ
flags.

To underline the call context of packet_handler() and
bus_reset_handler(), rename these functions to *_irq_handler().
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

nosy_stop_snoop() would blow up the second time it was called without
nosy_start_snoop() in between.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

The required serialization of NOSY_IOC_START and NOSY_IOC_STOP is
already provided by the client_list_lock.

NOSY_IOC_FILTER does not really require serialization since accesses
to tcode_mask are atomic on any sane CPU architecture.  Nevertheless,
make it explicit that we want this to be atomic by means of
client_list_lock (which also surrounds the other tcode_mask access in
the IRQ handler).  While we are at it, change the type of tcode_mask to
u32 for consistency with the user API.

NOSY_IOC_GET_STATS does not require serialization against itself.  But
there is a bug here regarding concurrent updates of the two counters
by the IRQ handler.  Fix it by taking the client_list_lock in this ioctl
too.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

Extend copyright note to 2007, c.f. Kristian's git log.

Includes:
  - replace some <asm/*.h> by <linux/*.h>
  - add required indirectly included <linux/spinlock.h>
  - order alphabetically

Coding style related changes:
  - change to utf8
  - normalize whitespace
  - normalize comment style
  - remove usages of __FUNCTION__
  - remove an unnecessary cast from void *

Const and static declarations:
  - driver_name is not const in pci_driver.name, drop const qualifier
  - driver_name can be taken from KBUILD_MODNAME
  - the global variable minors[] can and should be static
  - constify struct file_operations instance

Data types:
  - Remove unused struct member struct packet.code.  struct packet is
    only used for driver-internal bookkeeping; it does not appear on the
    wire or in DMA programs or the userspace ABI.  Hence the unused
    member .code can be removed without worries.

Preprocessor macros:
  - unroll a preprocessor macro that containd a return
  - use list_for_each_entry

Printk:
  - add missing terminating \n in some format strings
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

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: NStefan Richter <stefanr@s5r6.in-berlin.de>
Acked-by: NKristian Høgsberg <krh@bitplanet.net>