Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 w1_ds2406 kernel driver 2 ======================= 3 4 Supported chips: 5 * Maxim DS2406 (and other family 0x12) addressable switches 6 7 Author: Scott Alfter <scott@alfter.us> 8 9 Description 10 ----------- 11 12 The w1_ds2406 driver allows connected devices to be switched on and off. 13 These chips also provide 128 bytes of OTP EPROM, but reading/writing it is 14 not supported. In TSOC-6 form, the DS2406 provides two switch outputs and 15 can be provided with power on a dedicated input. In TO-92 form, it provides 16 one output and uses parasitic power only. 17 18 The driver provides two sysfs files. state is readable; it gives the 19 current state of each switch, with PIO A in bit 0 and PIO B in bit 1. The 20 driver ORs this state with 0x30, so shell scripts get an ASCII 0/1/2/3 to 21 work with. output is writable; bits 0 and 1 control PIO A and B, 22 respectively. Bits 2-7 are ignored, so it's safe to write ASCII data. 23 24 CRCs are checked on read and write. Failed checks cause an I/O error to be 25 returned. On a failed write, the switch status is not changed.