[Bug 258994] iic(4): Panics on Nanopi Neo when using 16-bit device addressing width: panic: Assertion strlen(description) < MAX_W_NAME failed at ... sys/kern/subr_witness.c:1914

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258994

--- Comment #4 from alydiomc@yahoo.com ---
Comment on attachment 228624
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=228624
twsi.c driver

Seems the driver does not handle 16bit wide addressing properly.

I made some modification. Looks to be working.

root@nanopi-neo:~/prog/I2C # ./i2c -s -f /dev/iic0
Scanning I2C devices on /dev/iic0: 57 68

root@nanopi-neo:~/prog/I2C # ./i2c -a 0x57 -f /dev/iic0 -d r -o 0 -w 16 -c 16
-m tr
00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f

root@nanopi-neo:~/prog/I2C # echo -n "test" | ./i2c -a 0x57 -f /dev/iic0 -d w
-o 0x6 -w 16 -c 4 -m tr
root@nanopi-neo:~/prog/I2C # ./i2c -a 0x57 -f /dev/iic0 -d r -o 0 -w 16 -c 16
-m tr
00 01 02 03 04 05 74 65 73 74 0a 0b 0c 0d 0e 0f

root@nanopi-neo:~/prog/I2C # date;./ds1307 -s;./ds1307 -r
Tue Oct 12 19:45:35 PST 2021
19:45:35 12/10/2021

root@nanopi-neo:~/prog/I2C # ./i2c -a 0x68 -f /dev/iic0 -d r -o 0 -w 8 -c 1 -m
tr
15
root@nanopi-neo:~/prog/I2C # ./i2c -a 0x68 -f /dev/iic0 -d r -o 0 -w 8 -c 1 -m
tr
16

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