pmu(4) [netbsd man page]

PMU(4)							   BSD Kernel Interfaces Manual 						    PMU(4)

NAME

     pmu -- support for Power Management Units found in all Apple laptops and some desktop Power Macintosh computers

SYNOPSIS

     pmu* at obio?
     nadb* at pmu?
     battery* at pmu?
     smartbat* at pmu?

DESCRIPTION

     The pmu driver provides support for the Power Management Unit found in Apple laptops and some desktop Power Macintosh computers.  Functions
     controlled by the PMU include the real time clock, ADB, power, batteries, on some laptops like the PowerBook 3400c and similar machines it
     also controls hotkeys and display brightness, on others it provides an iic(9) bus and on some it controls CPU speed.  On many older machines
     it also provides access to some non-volatile memory and thermal sensors.  Not all those features are present on all machines, for instance
     Power Macintosh G4 and later machines don't have ADB, many more recent laptops have display brightness and backlight control built into the
     graphics controller instead of the PMU, only a few older PowerBooks use the PMU for CPU speed control and newer machines use a different way
     to access non-volatile memory.  However, all known PMUs so far provide a real time clock and power control.

   Notes by model
     Real time clock and power control are present and supported on all machines that can run NetBSD/macppc, ADB is supported when present.

     PowerBook 2400, 3400c, and 3500
		   Battery status and thermal sensors found on the mainboard and in the battery pack are supported by the battery(4) driver, val-
		   ues can be read via envsys(4).  Hotkeys for brightness control are supported, CPU speed control and parameter RAM are present
		   but unsupported.

     Power Macintosh G4
		   ADB is not present, iic(9) is present but unsupported.

SEE ALSO

     battery(4), cuda(4), nadb(4), nvram(4), obio(4), iic(9)

BUGS

     Some features are currently unsupported, like the iic(9) bus, access to parameter RAM and CPU speed control.

BSD
								   May 14, 2007 							       BSD

IIC(4)							   BSD Kernel Interfaces Manual 						    IIC(4)

NAME

     iic -- Inter IC (I2C) bus

SYNOPSIS

     iic* at alipm?		  # sparc64
     iic* at acpismbus? 	  # amd64 i386
     iic* at amdpm?		  # amd64 i386
     iic* at armadillo9iic?	  # evbarm
     iic0 at at91twi?		  # evbarm
     iic0 at ausmbus0		  # evbmips
     iic0 at cuda0		  # macppc
     iic0 at gpiic?		  # evbppc
     iic* at gpioiic?		  # amd64 i386
     iic* at gtiic?		  # evbppc
     iic* at gxiic?		  # evbarm
     iic* at ichsmb?		  # amd64 i386
     iic0 at iociic0		  # acorn26
     iic0 at iomdiic?		  # acorn32
     iic0 at iopiic?		  # evbarm iyonix
     iic* at ki2c?		  # macppc
     iic* at nfsmb?		  # amd64 i386
     iic* at ociic?		  # sandpoint
     iic* at piixpm?		  # amd64 i386
     iic0 at slugiic0		  # evbarm
     iic* at viapcib?		  # i386

DESCRIPTION

     I2C is a two-wire bus developed by Philips used for connecting integrated circuits.  It is commonly used for connecting devices such as EEP-
     ROMs, temperature sensors, fan controllers, real-time clocks, tuners, and other types of integrated circuits.

     The iic driver provides a uniform programming interface layer between I2C master controllers and various I2C slave devices.  Each I2C master
     controller attaches an iic framework; several slave devices can then be attached to the iic bus.

     All I2C slave devices are uniquely identified by the address on the bus.  The master accesses a particular slave device using its address.

     System Management Bus (SMBus) protocol is also supported by emulating it with the I2C commands.

SUPPORTED MASTERS

     A wide list of I2C masters are supported, among them are:

	   alipm(4)	       Acer Labs M7101 SMBus controller
	   acpismbus(4)        ACPI SMBus Control Method Interface
	   amdpm(4)	       AMD768 Power Management Controller and AMD8111 System Management Controller
	   armadillo9iic(4)
	   at91twi(4)
	   ausmbus(4)
	   cuda(4)	       support for CUDA microcontrollers found in many Power Macintosh and and compatible computers
	   gpiic(4)
	   gtiic(4)
	   gxiic(4)
	   ichsmb(4)	       Intel ICH SMBus controller
	   iociic(4)
	   iomdiic(4)
	   iopiic(4)
	   ki2c(4)
	   gpioiic(4)	       GPIO bit-banging
	   nfsmb(4)	       NVIDIA nForce 2/3/4 SMBus controller and SMBus driver
	   ociic(4)
	   piixpm(4)	       Intel PIIX and compatible Power Management controller
	   slugiic(4)
	   viapcib(4)

SUPPORTED SLAVES

     A wide list of slaves are supported, among them:

	   dbcool(4)	  dbCool(tm) family of environmental monitors and fan controllers
	   rs5c372rtc(4)  RICOH RS5C372A and RS5C372B real-time clock
	   sgsmix(4)	  driver for SGS 7433 Basic Audio Processor found in some Apple machines
	   spdmem(4)	  Generic Memory Module Serial Presence Detect

SEE ALSO

     dtviic(4), intro(4), i2cscan(8), iic(9)

HISTORY

     The I2C framework first appeared in NetBSD 2.0.  OpenBSD support was added in OpenBSD 3.6.  This manpage first appeared in NetBSD 6.0, it was
     ported from OpenBSD.

AUTHORS

     The I2C framework was written by Steve C. Woodford and Jason R. Thorpe for NetBSD and then ported to OpenBSD by Alexander Yurchenko
     <grange@openbsd.org>.

BSD
								 October 15, 2011							       BSD