the userspace eeprom writing tools in prog/eepromer may help you. also see the documents in http://www2.lm-sensors.nu/~lm78/docs.html Michael Rumpf wrote: > Hi, > > I have an external Hygrometer which stores temperature > and humidity snapshots on the device and which can be > read by a Windows software. I would like to write a > Linux program to access the device and read the > values. > > After analyzing the Windows software I found out that > they are using a really "simple" I2C interface to the > device, the plain serial port. Especially the status > lines DTR (SCL), CTS (SDA Write), DSR (SDA Read). The > chip that stores the values is an eeprom Atmel > AT24C128/256 (?). > > After digging through the I2C/lm_sensors code/docs I > found that much of the infrastructure for accessing > eeproms has already been implemented in a modular way. > > Unfortunately I had to read about some restrictions, > like that eeproms with more than 256Bytes (?) capacity > are not supported and that there is not write support > for eeproms. The device probably needs write support > to reset the values in the ring-buffer. > > Because I'm new to I2C and kernel driver development I > ask myself about the best approach to access the > device, described above. There are currently too many > unknown variables in my approach, so it would be kind > if someone with good knowledge of the kernel I2C > infrastructure could shortly explain what the best > approach would be to write a driver for the device. > Would it be possible to write a simple bus-driver, > like the parport(-light) driver and use an extended > version of the eeprom client driver to access the > device? > > I would prefer this approach as it would allow me to > use all the user-space I2C tools that access the > I2C/lm_sensors APIs. But if the effort for extending > the eeprom driver is high I need to investigate other > possibilities as I would like to get something working > really fast. > > Thanks in advance, > Michael > > > Michael Rumpf # Meissener Str. 4 # 71065 Sindelfingen # Germany > Tel/Fax +49 7031 415883/884 > WWW http://fsinfo.cs.uni-sb.de/~miru > Misraet Dir voll Dein Tagesplan, > sei Abends Dir als Trost bekraeftigt, > Du hast zwar heute nichts getan, > doch warst den ganzen Tag beschaeftigt. > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > _______________________________________________ > lm-sensors mailing list > lm-sensors at lm-sensors.org > http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
