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Hi @hhornbacher , forgive me if I insist (I wrote you a mail) but I really would like to make this work..
I'm trying to use this driver on a Olinuxino A20, and tried several things. I'm running arch linux arm, linux-sunxi kernel 3.4.103. My sensor has the AM2303 code printed on it.
First, I changed the include <mach/sys_config.h> to <plat/sys_config.h> because the linux-sunxi-headers have a wrong symlink, so I bypassed the problem.
I succesfully compiled and loaded the module, but everytime I cat /proc/dht22/raw_data I get wrong values and dmesg shows that I have a diff=1 (sometimes 2) at the first reading.
I tried to change delays in the write part but nothing changed.
I checked that my DHT22 works with a minimus avr (similar to teensy 1.0) using the arduino DHTlib.
I also tried to get rid of all the compilation warnings by adjusting some casts and prototypes, but obviously nothing changed.
I also checked that dht22_sun5i_write_bit and dht22_sun5i_read_bit functions are working properly by modifying the dht22_sun5i_sensor_read function to only read the pin (and connecting it to vcc/gnd) or write to it (and using a multimeter).
As I found in every guide I red (for arduino, raspberry and other dev boards) I use 10K resistor between VCC (5V) and data (but removing the resistor doesn't have any effects).

So the end result is the function detects that the line doesn't go in low voltage state after issuing the start command. What am I doing wrong?
Any help is much appreciated.