Hi,

I am not sure if this is a bug or not :-)

Currently I am using revision 12089 (https://svn.openwrt.org/openwrt/trunk) on an BR6104KP (kernel 2.6.25.12). I can use all  LEDs except the USB leds - but this is not my problem. I have set up i2c via make menuconfig. The relevant parts of .config looks like

/raid5-4/openwrt-040808/trunk> grep -in i2c .config
1042:# I2C support
1044:CONFIG_PACKAGE_kmod-i2c-core=y
1045:CONFIG_PACKAGE_kmod-i2c-algo-bit=y
1046:# CONFIG_PACKAGE_kmod-i2c-algo-pca is not set
1047:# CONFIG_PACKAGE_kmod-i2c-algo-pcf is not set
1048:CONFIG_PACKAGE_kmod-i2c-gpio=y
1049:CONFIG_PACKAGE_kmod-i2c-gpio-custom=y

The kernel module i2c-gpio-custom.ko was build but I am not able to load it without error messages:

root@OpenWrt:~# rmmod  i2c-gpio-custom
root@OpenWrt:~# cd /lib/modules/2.6.25.12
root@OpenWrt:/lib/modules/2.6.25.12# insmod  i2c-gpio-custom.ko bus0=0,1,3

The module is loaded but I got this ugly message
Custom GPIO-based I2C driver version 0.1.0
kobject (80e4f070): tried to init an initialized object, something is seriously wrong.

Call Trace:[<8000781c>][<8000781c>][<800fd0b0>][<80127810>][<8012c94c>][<8012c9f4>]
[<8012c87c>][<80020774>][<c00a1144>][<80020774>][<c00a1000>][<c00a11a0>][<80063d34>]
[<80045920>][<800091f0>]

I have checked the following instructions again and again:
http://linux-adm5120.sourceforge.net/openwrt/i2c/

Any ideas?

Best regards,
Frank

(Last edited by frank-km on 13 Aug 2008, 16:23)

Hi,

It was a bug.

Fixed in r12297.

Regards,
Gabor

Hi Gabor,

Thanks a lot - I will test the patches tomorrow.

Best regards,
Frank

Hi,

I can confirm that the i2c_gpio_custom.ko driver works now perfect:

-------

1. insmod i2c_gpio_custom.ko bus0=0,3,1
Custom GPIO-based I2C driver version 0.1.1

2. insmod i2c_gpio.ko
i2c-gpio i2c-gpio.0: using pins 3 (SDA) and 1 (SCL)

3. (I am using a DS1631, all 3 adress bits grounded)
root@OpenWrt:~# i2cdetect 0
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-0.
I will probe address range 0x03-0x77.
Continue? [Y/n]
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- 48 -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --                         

4. start temperature measurement
root@OpenWrt:~# i2cget 0 0x48 0x51  w
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will read from device file /dev/i2c-0, chip address 0x48, data address
0x51, using read word data.
Continue? [Y/n]
0x000f

5. get the temperature
root@OpenWrt:~# i2cget 0 0x48 0xaa  w
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will read from device file /dev/i2c-0, chip address 0x48, data address
0xaa, using read word data.
Continue? [Y/n]
0x801a

6.Result:
0x801a means 26,50°C. In comparission with an analog Hg thermometer the result is great (26,0 °C)

NOW I AM SURE: It is to hot in my apartement ;-)

Best regards,
Frank

(Last edited by frank-km on 14 Aug 2008, 15:08)

w1-gpio-custom also suffers from the same problem, and requires the same fix.