[IrDA]: Kingsun Dazzle IrDA USB driver

This dongle does not follow the usb-irda specification, so it needs its own
special driver. Just like the Kingsun/Donshine dongle, it exposes two
interrupt endpoints. Reception is performed through direct reads from the
input endpoint. Transmission requires splitting the IrDA frames into 8-byte
segments, in which the first byte encodes how many of the remaining 7 bytes
are used as data. Speed change is made with a control URB just like the one
in cypress_m8, and it seems to support up to 115200 bps.

On plugin, this dongle reports vendor and device IDs: 0x07d0:0x4100
Signed-off-by: Alex Villacís Lasso <a_villacis@palosanto.com>
Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/irda/Kconfig

@@ -162,7 +162,19 @@ config EP7211_DONGLE
 	  Say Y here if you want to build support for the Cirrus logic
 	  EP7211 chipset's infrared module.
 
+config KSDAZZLE_DONGLE
+	tristate "KingSun Dazzle IrDA-USB dongle (EXPERIMENTAL)"
+	depends on IRDA && USB && EXPERIMENTAL
+	help
+	  Say Y or M here if you want to build support for the KingSun Dazzle
+	  IrDA-USB bridge device driver.
+
+	  This USB bridge does not conform to the IrDA-USB device class
+	  specification, and therefore needs its own specific driver. This
+	  dongle supports SIR speeds only (9600 through 115200 bps).
 
+	  To compile it as a module, choose M here: the module will be called
+	  ksdazzle-sir.
 
 comment "Old SIR device drivers"
 

drivers/net/irda/Makefile

@@ -47,6 +47,7 @@ obj-$(CONFIG_MA600_DONGLE)	+= ma600-sir.o
 obj-$(CONFIG_TOIM3232_DONGLE)	+= toim3232-sir.o
 obj-$(CONFIG_EP7211_DONGLE)	+= ep7211-sir.o
 obj-$(CONFIG_KINGSUN_DONGLE)	+= kingsun-sir.o
+obj-$(CONFIG_KSDAZZLE_DONGLE)	+= ksdazzle-sir.o
 
 # The SIR helper module
 sir-dev-objs := sir_dev.o sir_dongle.o