Re: Linux driver for Realtek RTL8723AU devices with USB ID 0bda:1724such as found in Lenovo IdeaPad Yoga 13

From: Larry Finger
Date: Wed May 08 2013 - 16:17:34 EST

On 05/08/2013 11:29 AM, H. Peter Anvin wrote:
On 05/08/2013 09:06 AM, Larry Finger wrote:
On 05/07/2013 09:32 PM, H. Peter Anvin wrote:

So I can verify that this driver works against 3.8.11 (not against
current -linus because of a build failure), and yes, there is Bluetooth
in this device. In fact, it seems to work better than some in-tree
drivers I have seen in the past.

However, I'm confused as to the above and what it implies for the
purpose of the staging tree. Wasn't the whole point of the staging tree
to have a working-but-ugly driver upstream and have the work to clean it
up happen in the mainline tree instead of off somewhere.

Yes, but even staging has some standards. For example, they frown on
inclusion of firmware in a massive data block in a file in the driver -
it should be in a separate file the /lib/firmware/ tree. In addition,
the mainline drivers/net/wireless/ tree is only available to devices
that use mac80211 for the software-based MAC layer. That conversion is a
serious effort that may never be done, thus the 8723au driver may never
leave staging.

What are the details of the build failure on the mainline tree? It
builds fine here. One possibility is that your source tree has a
leftover copy of include/linux/version.h that contains a stale coded
value of the kernel version. I just pushed a Makefile fix that causes
the compiler to look in the new location for version.h first. If that
doesn't work, please post the error.


Unlikely, since the kernel source tree is clean.

The error is on os_dep/os_intfs.c:

/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c: In function ‘rtw_proc_init_one’:
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:315:3: error: implicit declaration
of function ‘create_proc_entry’ [-Werror=implicit-function-declaration]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:315:11: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:322:3: error: implicit declaration
of function ‘create_proc_read_entry’ [-Werror=implicit-function-declaration]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:322:9: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:333:21: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:364:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:370:7: error: dereferencing pointer
to incomplete type
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:372:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:378:7: error: dereferencing pointer
to incomplete type
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:381:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:389:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:397:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:405:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:412:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:419:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:426:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:433:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:440:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:447:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:454:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:461:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:468:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:475:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:482:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:489:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:496:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:505:9: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:512:9: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:522:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:539:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:545:7: error: dereferencing pointer
to incomplete type
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:547:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:553:7: error: dereferencing pointer
to incomplete type
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:555:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:561:7: error: dereferencing pointer
to incomplete type
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:563:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:569:7: error: dereferencing pointer
to incomplete type
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:572:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:576:8: warning: assignment makes
pointer from integer without a cast [enabled by default]
/home/hpa/kernel/rtl8723au/os_dep/os_intfs.c:582:7: error: dereferencing pointer
to incomplete type

I just pushed a "fix" that will allow the driver to build on kernel 3.10-rc0 (aka 3.9-git). This one removes all the procfs stuff. It will be added back in /sysfs later.

Larry


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