[PATCH] ZyDAS ZD1211 USB-WLAN driver

There are 60+ USB wifi adapters available on the market based on the ZyDAS
ZD1211 chip.

Unlike the predecessor (ZD1201), ZD1211 does not have a hardware MAC, so most
data operations are coordinated by the device driver. The ZD1211 chip sits
alongside an RF transceiver which is also controlled by the driver. Our driver
currently supports 2 RF types, we know of one other available in a few marketed
products which we will be supporting soon.

Our driver also supports the newer revision of ZD1211, called ZD1211B. The
initialization and RF operations are slightly different for the new revision,
but the main difference is 802.11e support. Our driver does not support the
QoS features yet, but we think we know how to use them.

This driver is based on ZyDAS's own GPL driver available from www.zydas.com.tw.
ZyDAS engineers have been responsive and supportive of our efforts, so thumbs
up to them. Additionally, the firmware is redistributable and they have
provided device specs.

This driver has been written primarily by Ulrich Kunitz and myself. Graham
Gower, Greg KH, Remco and Bryan Rittmeyer have also contributed. The
developers of ieee80211 and softmac have made our lives so much easier- thanks!

We maintain a small info-page: http://zd1211.ath.cx/wiki/DriverRewrite

If there is enough time for review, we would like to aim for inclusion in
2.6.18. The driver works nicely as a STA, and can connect to both open and
encrypted networks (we are using software-based encryption for now). We will
work towards supporting more advanced features in the future (ad-hoc, master
mode, 802.11a, ...).

Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

Author: Daniel Drake

drivers/net/wireless/Kconfig

@@ -550,6 +550,7 @@ config USB_ZD1201
 
 source "drivers/net/wireless/hostap/Kconfig"
 source "drivers/net/wireless/bcm43xx/Kconfig"
+source "drivers/net/wireless/zd1211rw/Kconfig"
 
 # yes, this works even when no drivers are selected
 config NET_WIRELESS

drivers/net/wireless/Makefile

@@ -36,6 +36,7 @@ obj-$(CONFIG_PRISM54)		+= prism54/
 
 obj-$(CONFIG_HOSTAP)		+= hostap/
 obj-$(CONFIG_BCM43XX)		+= bcm43xx/
+obj-$(CONFIG_ZD1211RW)		+= zd1211rw/
 
 # 16-bit wireless PCMCIA client drivers
 obj-$(CONFIG_PCMCIA_RAYCS)	+= ray_cs.o

drivers/net/wireless/zd1211rw/Kconfig

@@ -0,0 +1,19 @@
+config ZD1211RW
+	tristate "ZyDAS ZD1211/ZD1211B USB-wireless support"
+	depends on USB && IEEE80211 && IEEE80211_SOFTMAC && NET_RADIO && EXPERIMENTAL
+	select FW_LOADER
+	---help---
+	  This is an experimental driver for the ZyDAS ZD1211/ZD1211B wireless
+	  chip, present in many USB-wireless adapters.
+
+	  Device firmware is required alongside this driver. You can download the
+	  firmware distribution from http://zd1211.ath.cx/get-firmware
+
+config ZD1211RW_DEBUG
+	bool "ZyDAS ZD1211 debugging"
+	depends on ZD1211RW
+	---help---
+	  ZD1211 debugging messages. Choosing Y will result in additional debug
+	  messages being saved to your kernel logs, which may help debug any
+	  problems.
+

drivers/net/wireless/zd1211rw/Makefile

@@ -0,0 +1,11 @@
+obj-$(CONFIG_ZD1211RW) += zd1211rw.o
+
+zd1211rw-objs := zd_chip.o zd_ieee80211.o \
+		zd_mac.o zd_netdev.o \
+		zd_rf_al2230.o zd_rf_rf2959.o \
+		zd_rf.o zd_usb.o zd_util.o
+
+ifeq ($(CONFIG_ZD1211RW_DEBUG),y)
+EXTRA_CFLAGS += -DDEBUG
+endif
+