N900 Hardware Bus I2c
Hardware
Bus 1.
- 0x48 Gaia/chipset
dummy/1-004a dummy/1-0049 dummy/1-004b
Bus 2.
tsl2563/2-0029 smia-sensor/2-0010 aic3x I2C Codec/2-0018 aic34b_dummy/2-0019
adp1653/2-0030
- 0x63 FM receiver
tpa6130a2/2-0060 lp5523/2-0032
Bus 3.
ad5820/3-000c
et8ek8/3-003e lis302dl/3-001d
/sys/bus/i2c/drivers# ls -d */*-*
Software
The n900 software driving I2C comes in three flavours.
Firstly, there are a large number of kernel drivers.
Then, there are a small number of devices 'bit banged' through I2C ioctls - BME for example does this.
Finally, there are probably some I2C components in the Rapuyama and assorted cellphone/GPS hardware. These are not visible to the casual developer. (you have to open the n900 and probe stuff, or hack the phone firmware).