[linux.git] / Documentation / hwmon / amc6821

Kernel driver amc6821
=====================

Supported chips:
	Texas Instruments AMC6821
	Prefix: 'amc6821'
	Addresses scanned: 0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e, 0x4c, 0x4d, 0x4e
	Datasheet: http://focus.ti.com/docs/prod/folders/print/amc6821.html

Authors:
	Tomaz Mertelj <[email protected]>


Description
-----------

This driver implements support for the Texas Instruments amc6821 chip.
The chip has one on-chip and one remote temperature sensor and one pwm fan
regulator.
The pwm can be controlled either from software or automatically.

The driver provides the following sensor accesses in sysfs:

temp1_input		ro	on-chip temperature
temp1_min		rw	"
temp1_max		rw	"
temp1_crit	 	rw	"
temp1_min_alarm		ro	"
temp1_max_alarm		ro	"
temp1_crit_alarm	ro	"

temp2_input		ro	remote temperature
temp2_min		rw	"
temp2_max		rw	"
temp2_crit	 	rw	"
temp2_min_alarm		ro	"
temp2_max_alarm		ro	"
temp2_crit_alarm	ro	"
temp2_fault		ro	"

fan1_input	 	ro	tachometer speed
fan1_min		rw	"
fan1_max		rw	"
fan1_fault	 	ro	"
fan1_div		rw	Fan divisor can be either 2 or 4.

pwm1			rw	pwm1
pwm1_enable		rw	regulator mode, 1=open loop, 2=fan controlled
				by remote temperature, 3=fan controlled by
				combination of the on-chip temperature and
				remote-sensor temperature,
pwm1_auto_channels_temp ro	1 if pwm_enable==2, 3 if pwm_enable==3
pwm1_auto_point1_pwm	ro	Hardwired to 0, shared for both
				temperature channels.
pwm1_auto_point2_pwm	rw	This value is shared for both temperature
				channels.
pwm1_auto_point3_pwm	rw	Hardwired to 255, shared for both
				temperature channels.

temp1_auto_point1_temp	ro	Hardwired to temp2_auto_point1_temp
				which is rw. Below this temperature fan stops.
temp1_auto_point2_temp	rw	The low-temperature limit of the proportional
				range. Below this temperature
				pwm1 = pwm1_auto_point2_pwm. It can go from
				0 degree C to 124 degree C in steps of
				4 degree C. Read it out after writing to get
				the actual value.
temp1_auto_point3_temp	rw	Above this temperature fan runs at maximum
				speed. It can go from temp1_auto_point2_temp.
				It can only have certain discrete values
				which depend on temp1_auto_point2_temp and
				pwm1_auto_point2_pwm. Read it out after
				writing to get the actual value.

temp2_auto_point1_temp	rw	Must be between 0 degree C and 63 degree C and
				it defines the passive cooling temperature.
				Below this temperature the fan stops in
				the closed loop mode.
temp2_auto_point2_temp	rw	The low-temperature limit of the proportional
				range. Below this temperature
				pwm1 = pwm1_auto_point2_pwm. It can go from
				0 degree C to 124 degree C in steps
				of 4 degree C.

temp2_auto_point3_temp	rw	Above this temperature fan runs at maximum
				speed. It can only have certain discrete
				values which depend on temp2_auto_point2_temp
				and pwm1_auto_point2_pwm. Read it out after
				writing to get actual value.


Module parameters
-----------------

If your board has a BIOS that initializes the amc6821 correctly, you should
load the module with: init=0.

If your board BIOS doesn't initialize the chip, or you want
different settings, you can set the following parameters:
init=1,
pwminv: 0 default pwm output, 1 inverts pwm output.
Commit	Line	Data
b5430a04 TM	1	Kernel driver amc6821
	2	=====================
	3
	4	Supported chips:
	5	Texas Instruments AMC6821
	6	Prefix: 'amc6821'
	7	Addresses scanned: 0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e, 0x4c, 0x4d, 0x4e
	8	Datasheet: http://focus.ti.com/docs/prod/folders/print/amc6821.html
	9
	10	Authors:
	11	Tomaz Mertelj <[email protected]>
	12
	13
	14	Description
	15	-----------
	16
	17	This driver implements support for the Texas Instruments amc6821 chip.
	18	The chip has one on-chip and one remote temperature sensor and one pwm fan
	19	regulator.
	20	The pwm can be controlled either from software or automatically.
	21
	22	The driver provides the following sensor accesses in sysfs:
	23
	24	temp1_input ro on-chip temperature
	25	temp1_min rw "
	26	temp1_max rw "
	27	temp1_crit rw "
	28	temp1_min_alarm ro "
	29	temp1_max_alarm ro "
	30	temp1_crit_alarm ro "
	31
	32	temp2_input ro remote temperature
	33	temp2_min rw "
	34	temp2_max rw "
	35	temp2_crit rw "
	36	temp2_min_alarm ro "
	37	temp2_max_alarm ro "
	38	temp2_crit_alarm ro "
	39	temp2_fault ro "
	40
	41	fan1_input ro tachometer speed
	42	fan1_min rw "
	43	fan1_max rw "
	44	fan1_fault ro "
	45	fan1_div rw Fan divisor can be either 2 or 4.
	46
	47	pwm1 rw pwm1
	48	pwm1_enable rw regulator mode, 1=open loop, 2=fan controlled
	49	by remote temperature, 3=fan controlled by
	50	combination of the on-chip temperature and
	51	remote-sensor temperature,
	52	pwm1_auto_channels_temp ro 1 if pwm_enable==2, 3 if pwm_enable==3
	53	pwm1_auto_point1_pwm ro Hardwired to 0, shared for both
	54	temperature channels.
	55	pwm1_auto_point2_pwm rw This value is shared for both temperature
	56	channels.
	57	pwm1_auto_point3_pwm rw Hardwired to 255, shared for both
	58	temperature channels.
	59
	60	temp1_auto_point1_temp ro Hardwired to temp2_auto_point1_temp
	61	which is rw. Below this temperature fan stops.
	62	temp1_auto_point2_temp rw The low-temperature limit of the proportional
	63	range. Below this temperature
	64	pwm1 = pwm1_auto_point2_pwm. It can go from
65	0 degree C to 124 degree C in steps of
66	4 degree C. Read it out after writing to get
67	the actual value.
68	temp1_auto_point3_temp rw Above this temperature fan runs at maximum
69	speed. It can go from temp1_auto_point2_temp.
70	It can only have certain discrete values
71	which depend on temp1_auto_point2_temp and
72	pwm1_auto_point2_pwm. Read it out after
73	writing to get the actual value.
74
75	temp2_auto_point1_temp rw Must be between 0 degree C and 63 degree C and
76	it defines the passive cooling temperature.
77	Below this temperature the fan stops in
78	the closed loop mode.
79	temp2_auto_point2_temp rw The low-temperature limit of the proportional
80	range. Below this temperature
81	pwm1 = pwm1_auto_point2_pwm. It can go from
82	0 degree C to 124 degree C in steps
83	of 4 degree C.
84
85	temp2_auto_point3_temp rw Above this temperature fan runs at maximum
86	speed. It can only have certain discrete
87	values which depend on temp2_auto_point2_temp
88	and pwm1_auto_point2_pwm. Read it out after
89	writing to get actual value.
90
91
92	Module parameters
93	-----------------
94
95	If your board has a BIOS that initializes the amc6821 correctly, you should
96	load the module with: init=0.
97
98	If your board BIOS doesn't initialize the chip, or you want
99	different settings, you can set the following parameters:
100	init=1,
101	pwminv: 0 default pwm output, 1 inverts pwm output.
102