1 ======================= 2 w1_ds2406 kernel driver 3 ======================= 4 5 Supported chips: 6 7 * Maxim DS2406 (and other family 0x12) addressable switches 8 9 Author: Scott Alfter <scott@alfter.us> 10 11 Description 12 ----------- 13 14 The w1_ds2406 driver allows connected devices to be switched on and off. 15 These chips also provide 128 bytes of OTP EPROM, but reading/writing it is 16 not supported. In TSOC-6 form, the DS2406 provides two switch outputs and 17 can be provided with power on a dedicated input. In TO-92 form, it provides 18 one output and uses parasitic power only. 19 20 The driver provides two sysfs files. state is readable; it gives the 21 current state of each switch, with PIO A in bit 0 and PIO B in bit 1. The 22 driver ORs this state with 0x30, so shell scripts get an ASCII 0/1/2/3 to 23 work with. output is writable; bits 0 and 1 control PIO A and B, 24 respectively. Bits 2-7 are ignored, so it's safe to write ASCII data. 25 26 CRCs are checked on read and write. Failed checks cause an I/O error to be 27 returned. On a failed write, the switch status is not changed.
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