Here is driver implementing the most interesting IMHO parts of Dallas 1-wire protocol for linux kernel 2.6. It supports search/reset/read temperature and prowides API like i2c layer does. Since i only have 18s20 termometer driver provides only temperature reading. Obviously it is easy to report alarms, writing/reading eeprom and so on with created 1-wire framework. For testing i soldered ddc pin in my matrox g400 card to termometer's data pin and used this pin in GPIO mode. Strong pull-up was got from harddrive +5V. Read/write GPIO bits primitives are written and described in matrox_w1.c. Great thanks to Petr Vandrovec <VANDROVE at vc.cvut.cz> for explaining some bits of his matrox_fb driver, GPIO and I2C. The basic schema is following: wire.ko - provides general 1-wire API, netlink logging of search process(can be easily extended to log any other 1-wire events), sysfs processing and so on. matrox_w1.ko - low level transport realisation. w1d - netlink userspace daemon to monitor netlink events. All events can be both monitored through sysfs and netlink(after extending). A bit extended schema: after inserting wire.ko it registers new bus type and driver. It also creates main control kernel thread which accepts all new masters creating/destroying events. This code was moved to kernel thread since all sysfs related operations may sleep. When matrox_w1.ko or any other low level transport driver wants to register new master(i call master the logical connect from "master" part of computer to 1-wire device, one can have many masters, for example LPT and matrox GPIO masters) it can register bit operations it provides with predefined API from 1-wire main driver(wire.ko). New initialized 1-wire master object is then inserted into global list of masters. After registering main driver creates kernel thread to process this master's events. The reason for creating kernel thread is the same as for control thread. This thread searches for slaves and creates appropriate sysfs entries and sends netlink notifications. Reading from appropriate slave sysfs entry initiates READ ROM command(from only matching slave device). I think it is easy and simple to extend this framework to work with any kind of operations with Dallas's 1-wire protocol. I think it is the best and the only mail list to send this kind of drivers. Please test and comment. Evgeniy Polyakov ( s0mbre ) Only failure makes us experts. -- Theo de Raadt -------------- next part -------------- A non-text attachment was scrubbed... Name: matrox_w1.c Type: text/x-csrc Size: 6372 bytes Desc: not available Url : http://lists.lm-sensors.org/pipermail/lm-sensors/attachments/20040402/b55e56f2/attachment.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: w1.c Type: text/x-csrc Size: 14979 bytes Desc: not available Url : http://lists.lm-sensors.org/pipermail/lm-sensors/attachments/20040402/b55e56f2/attachment-0001.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: w1.h Type: text/x-chdr Size: 2340 bytes Desc: not available Url : http://lists.lm-sensors.org/pipermail/lm-sensors/attachments/20040402/b55e56f2/attachment-0002.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: w1_int.c Type: text/x-csrc Size: 4940 bytes Desc: not available Url : http://lists.lm-sensors.org/pipermail/lm-sensors/attachments/20040402/b55e56f2/attachment-0003.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: w1_int.h Type: text/x-chdr Size: 1214 bytes Desc: not available Url : http://lists.lm-sensors.org/pipermail/lm-sensors/attachments/20040402/b55e56f2/attachment-0004.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: w1_io.h Type: text/x-chdr Size: 3594 bytes Desc: not available Url : http://lists.lm-sensors.org/pipermail/lm-sensors/attachments/20040402/b55e56f2/attachment-0005.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: w1_log.h Type: text/x-chdr Size: 1053 bytes Desc: not available Url : http://lists.lm-sensors.org/pipermail/lm-sensors/attachments/20040402/b55e56f2/attachment-0006.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: w1_netlink.c Type: text/x-csrc Size: 1552 bytes Desc: not available Url : http://lists.lm-sensors.org/pipermail/lm-sensors/attachments/20040402/b55e56f2/attachment-0007.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: w1_netlink.h Type: text/x-chdr Size: 1136 bytes Desc: not available Url : http://lists.lm-sensors.org/pipermail/lm-sensors/attachments/20040402/b55e56f2/attachment-0008.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: w1d.c Type: text/x-csrc Size: 2907 bytes Desc: not available Url : http://lists.lm-sensors.org/pipermail/lm-sensors/attachments/20040402/b55e56f2/attachment-0009.bin
