While writing a driver for the DS2482 (an i2c to w1 bridge), I made a few enhancements to the w1 subsystem. 1. I added a new I/O function: triplet A triplet reads two bits and writes a direction bit. The DS2482 implements this in hardware. I modified w1_search() to use w1_triplet() at its core. 2. I cleaned up the I/O functions to separate emulated vs native w1 support. A w1 bus master must be able to do one of: a. Set and sample the line via write_bit() and read_bit() b. Support reset_bus() and touch_bit() Function set (a) is only needed for emulated devices (ie, a parallel port). I hid w1_read_bit() and w1_write_bit() behind w1_touch_bit(), and changed functions to call touch_bit() instead or read/write_bit(). 3. Searching is fairly slow - it requires about 200 w1 bit cycles per device, multiplied by the number of devices on the bus. I modified the w1_process() to NOT periodically search the bus. A sysfs entry was added to request a search. (w1_master_search). To request a search, echo anything into w1_master_search and it'll run another search. 4. I added a default family so that a slave device will get reported even if there isn't a driver for that family. Signed-off-by: Ben Gardner <bgardner at wabtec.com> -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: w1search.diff.txt Url: http://lists.lm-sensors.org/pipermail/lm-sensors/attachments/20050602/e2d8b838/attachment.txt
