Documentation/w1/slaves/w1_ds2406

   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.