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authorLinus Torvalds <torvalds@linux-foundation.org>2010-03-06 14:33:09 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-06 14:33:09 -0500
commitdff6d1c5ef9116a4478908001d72ee67127ecf01 (patch)
tree43c6e7ff8e8059f8fd733efd45b51f84b510d305 /Documentation
parent66ce3cf84deba6cc71dcf43c9d56a4278e5f712d (diff)
parenta0a5e3488a51c46f383c5faa86b53828e30ce153 (diff)
Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging
* 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging: (23 commits) hwmon: Remove the deprecated adt7473 driver hwmon: Fix off-by-one kind values hwmon: (tmp421) Fix temperature conversions hwmon: (tmp421) Restore missing inputs hwmon: Driver for Andigilog aSC7621 family monitoring chips hwmon: (adt7411) Improve locking hwmon: Add driver for ADT7411 voltage and temperature sensor hwmon: (w83793) Add watchdog functionality hwmon: (g760a) Make rpm_from_cnt static hwmon: (it87) Validate auto pwm settings hwmon: (it87) Add support for old automatic fan speed control hwmon: (it87) Drop dead web links in documentation hwmon: (it87) Add an entry in MAINTAINERS hwmon: (it87) Use strict_strtol instead of simple_strtol hwmon: (it87) Fix many checkpatch errors and warnings hwmon: (it87) Add support for beep on alarm hwmon: (it87) Create vid attributes by group hwmon: (it87) Refactor attributes creation and removal hwmon: (it87) Expose the PWM/temperature mappings hwmon: (it87) Display fan outputs in automatic mode as such ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/feature-removal-schedule.txt6
-rw-r--r--Documentation/hwmon/adt741142
-rw-r--r--Documentation/hwmon/adt747374
-rw-r--r--Documentation/hwmon/asc7621296
-rw-r--r--Documentation/hwmon/it8753
-rw-r--r--Documentation/hwmon/lm9022
6 files changed, 398 insertions, 95 deletions
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 31575e220f3b..a5cc0db63d7a 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -449,12 +449,6 @@ Who: Alok N Kataria <akataria@vmware.com>
449 449
450---------------------------- 450----------------------------
451 451
452What: adt7473 hardware monitoring driver
453When: February 2010
454Why: Obsoleted by the adt7475 driver.
455Who: Jean Delvare <khali@linux-fr.org>
456
457---------------------------
458What: Support for lcd_switch and display_get in asus-laptop driver 452What: Support for lcd_switch and display_get in asus-laptop driver
459When: March 2010 453When: March 2010
460Why: These two features use non-standard interfaces. There are the 454Why: These two features use non-standard interfaces. There are the
diff --git a/Documentation/hwmon/adt7411 b/Documentation/hwmon/adt7411
new file mode 100644
index 000000000000..1632960f9745
--- /dev/null
+++ b/Documentation/hwmon/adt7411
@@ -0,0 +1,42 @@
1Kernel driver adt7411
2=====================
3
4Supported chips:
5 * Analog Devices ADT7411
6 Prefix: 'adt7411'
7 Addresses scanned: 0x48, 0x4a, 0x4b
8 Datasheet: Publicly available at the Analog Devices website
9
10Author: Wolfram Sang (based on adt7470 by Darrick J. Wong)
11
12Description
13-----------
14
15This driver implements support for the Analog Devices ADT7411 chip. There may
16be other chips that implement this interface.
17
18The ADT7411 can use an I2C/SMBus compatible 2-wire interface or an
19SPI-compatible 4-wire interface. It provides a 10-bit analog to digital
20converter which measures 1 temperature, vdd and 8 input voltages. It has an
21internal temperature sensor, but an external one can also be connected (one
22loses 2 inputs then). There are high- and low-limit registers for all inputs.
23
24Check the datasheet for details.
25
26sysfs-Interface
27---------------
28
29in0_input - vdd voltage input
30in[1-8]_input - analog 1-8 input
31temp1_input - temperature input
32
33Besides standard interfaces, this driver adds (0 = off, 1 = on):
34
35 adc_ref_vdd - Use vdd as reference instead of 2.25 V
36 fast_sampling - Sample at 22.5 kHz instead of 1.4 kHz, but drop filters
37 no_average - Turn off averaging over 16 samples
38
39Notes
40-----
41
42SPI, external temperature sensor and limit registers are not supported yet.
diff --git a/Documentation/hwmon/adt7473 b/Documentation/hwmon/adt7473
deleted file mode 100644
index 446612bd1fb9..000000000000
--- a/Documentation/hwmon/adt7473
+++ /dev/null
@@ -1,74 +0,0 @@
1Kernel driver adt7473
2======================
3
4Supported chips:
5 * Analog Devices ADT7473
6 Prefix: 'adt7473'
7 Addresses scanned: I2C 0x2C, 0x2D, 0x2E
8 Datasheet: Publicly available at the Analog Devices website
9
10Author: Darrick J. Wong
11
12This driver is depreacted, please use the adt7475 driver instead.
13
14Description
15-----------
16
17This driver implements support for the Analog Devices ADT7473 chip family.
18
19The ADT7473 uses the 2-wire interface compatible with the SMBUS 2.0
20specification. Using an analog to digital converter it measures three (3)
21temperatures and two (2) voltages. It has four (4) 16-bit counters for
22measuring fan speed. There are three (3) PWM outputs that can be used
23to control fan speed.
24
25A sophisticated control system for the PWM outputs is designed into the
26ADT7473 that allows fan speed to be adjusted automatically based on any of the
27three temperature sensors. Each PWM output is individually adjustable and
28programmable. Once configured, the ADT7473 will adjust the PWM outputs in
29response to the measured temperatures without further host intervention.
30This feature can also be disabled for manual control of the PWM's.
31
32Each of the measured inputs (voltage, temperature, fan speed) has
33corresponding high/low limit values. The ADT7473 will signal an ALARM if
34any measured value exceeds either limit.
35
36The ADT7473 samples all inputs continuously. The driver will not read
37the registers more often than once every other second. Further,
38configuration data is only read once per minute.
39
40Special Features
41----------------
42
43The ADT7473 have a 10-bit ADC and can therefore measure temperatures
44with 0.25 degC resolution. Temperature readings can be configured either
45for twos complement format or "Offset 64" format, wherein 63 is subtracted
46from the raw value to get the temperature value.
47
48The Analog Devices datasheet is very detailed and describes a procedure for
49determining an optimal configuration for the automatic PWM control.
50
51Configuration Notes
52-------------------
53
54Besides standard interfaces driver adds the following:
55
56* PWM Control
57
58* pwm#_auto_point1_pwm and temp#_auto_point1_temp and
59* pwm#_auto_point2_pwm and temp#_auto_point2_temp -
60
61point1: Set the pwm speed at a lower temperature bound.
62point2: Set the pwm speed at a higher temperature bound.
63
64The ADT7473 will scale the pwm between the lower and higher pwm speed when
65the temperature is between the two temperature boundaries. PWM values range
66from 0 (off) to 255 (full speed). Fan speed will be set to maximum when the
67temperature sensor associated with the PWM control exceeds temp#_max.
68
69Notes
70-----
71
72The NVIDIA binary driver presents an ADT7473 chip via an on-card i2c bus.
73Unfortunately, they fail to set the i2c adapter class, so this driver may
74fail to find the chip until the nvidia driver is patched.
diff --git a/Documentation/hwmon/asc7621 b/Documentation/hwmon/asc7621
new file mode 100644
index 000000000000..7287be7e1f21
--- /dev/null
+++ b/Documentation/hwmon/asc7621
@@ -0,0 +1,296 @@
1Kernel driver asc7621
2==================
3
4Supported chips:
5 Andigilog aSC7621 and aSC7621a
6 Prefix: 'asc7621'
7 Addresses scanned: I2C 0x2c, 0x2d, 0x2e
8 Datasheet: http://www.fairview5.com/linux/asc7621/asc7621.pdf
9
10Author:
11 George Joseph
12
13Description provided by Dave Pivin @ Andigilog:
14
15Andigilog has both the PECI and pre-PECI versions of the Heceta-6, as
16Intel calls them. Heceta-6e has high frequency PWM and Heceta-6p has
17added PECI and a 4th thermal zone. The Andigilog aSC7611 is the
18Heceta-6e part and aSC7621 is the Heceta-6p part. They are both in
19volume production, shipping to Intel and their subs.
20
21We have enhanced both parts relative to the governing Intel
22specification. First enhancement is temperature reading resolution. We
23have used registers below 20h for vendor-specific functions in addition
24to those in the Intel-specified vendor range.
25
26Our conversion process produces a result that is reported as two bytes.
27The fan speed control uses this finer value to produce a "step-less" fan
28PWM output. These two bytes are "read-locked" to guarantee that once a
29high or low byte is read, the other byte is locked-in until after the
30next read of any register. So to get an atomic reading, read high or low
31byte, then the very next read should be the opposite byte. Our data
32sheet says 10-bits of resolution, although you may find the lower bits
33are active, they are not necessarily reliable or useful externally. We
34chose not to mask them.
35
36We employ significant filtering that is user tunable as described in the
37data sheet. Our temperature reports and fan PWM outputs are very smooth
38when compared to the competition, in addition to the higher resolution
39temperature reports. The smoother PWM output does not require user
40intervention.
41
42We offer GPIO features on the former VID pins. These are open-drain
43outputs or inputs and may be used as general purpose I/O or as alarm
44outputs that are based on temperature limits. These are in 19h and 1Ah.
45
46We offer flexible mapping of temperature readings to thermal zones. Any
47temperature may be mapped to any zone, which has a default assignment
48that follows Intel's specs.
49
50Since there is a fan to zone assignment that allows for the "hotter" of
51a set of zones to control the PWM of an individual fan, but there is no
52indication to the user, we have added an indicator that shows which zone
53is currently controlling the PWM for a given fan. This is in register
5400h.
55
56Both remote diode temperature readings may be given an offset value such
57that the reported reading as well as the temperature used to determine
58PWM may be offset for system calibration purposes.
59
60PECI Extended configuration allows for having more than two domains per
61PECI address and also provides an enabling function for each PECI
62address. One could use our flexible zone assignment to have a zone
63assigned to up to 4 PECI addresses. This is not possible in the default
64Intel configuration. This would be useful in multi-CPU systems with
65individual fans on each that would benefit from individual fan control.
66This is in register 0Eh.
67
68The tachometer measurement system is flexible and able to adapt to many
69fan types. We can also support pulse-stretched PWM so that 3-wire fans
70may be used. These characteristics are in registers 04h to 07h.
71
72Finally, we have added a tach disable function that turns off the tach
73measurement system for individual tachs in order to save power. That is
74in register 75h.
75
76--
77aSC7621 Product Description
78
79The aSC7621 has a two wire digital interface compatible with SMBus 2.0.
80Using a 10-bit ADC, the aSC7621 measures the temperature of two remote diode
81connected transistors as well as its own die. Support for Platform
82Environmental Control Interface (PECI) is included.
83
84Using temperature information from these four zones, an automatic fan speed
85control algorithm is employed to minimize acoustic impact while achieving
86recommended CPU temperature under varying operational loads.
87
88To set fan speed, the aSC7621 has three independent pulse width modulation
89(PWM) outputs that are controlled by one, or a combination of three,
90temperature zones. Both high- and low-frequency PWM ranges are supported.
91
92The aSC7621 also includes a digital filter that can be invoked to smooth
93temperature readings for better control of fan speed and minimum acoustic
94impact.
95
96The aSC7621 has tachometer inputs to measure fan speed on up to four fans.
97Limit and status registers for all measured values are included to alert
98the system host that any measurements are outside of programmed limits
99via status registers.
100
101System voltages of VCCP, 2.5V, 3.3V, 5.0V, and 12V motherboard power are
102monitored efficiently with internal scaling resistors.
103
104Features
105- Supports PECI interface and monitors internal and remote thermal diodes
106- 2-wire, SMBus 2.0 compliant, serial interface
107- 10-bit ADC
108- Monitors VCCP, 2.5V, 3.3V, 5.0V, and 12V motherboard/processor supplies
109- Programmable autonomous fan control based on temperature readings
110- Noise filtering of temperature reading for fan speed control
111- 0.25C digital temperature sensor resolution
112- 3 PWM fan speed control outputs for 2-, 3- or 4-wire fans and up to 4 fan
113 tachometer inputs
114- Enhanced measured temperature to Temperature Zone assignment.
115- Provides high and low PWM frequency ranges
116- 3 GPIO pins for custom use
117- 24-Lead QSOP package
118
119Configuration Notes
120===================
121
122Except where noted below, the sysfs entries created by this driver follow
123the standards defined in "sysfs-interface".
124
125temp1_source
126 0 (default) peci_legacy = 0, Remote 1 Temperature
127 peci_legacy = 1, PECI Processor Temperature 0
128 1 Remote 1 Temperature
129 2 Remote 2 Temperature
130 3 Internal Temperature
131 4 PECI Processor Temperature 0
132 5 PECI Processor Temperature 1
133 6 PECI Processor Temperature 2
134 7 PECI Processor Temperature 3
135
136temp2_source
137 0 (default) Internal Temperature
138 1 Remote 1 Temperature
139 2 Remote 2 Temperature
140 3 Internal Temperature
141 4 PECI Processor Temperature 0
142 5 PECI Processor Temperature 1
143 6 PECI Processor Temperature 2
144 7 PECI Processor Temperature 3
145
146temp3_source
147 0 (default) Remote 2 Temperature
148 1 Remote 1 Temperature
149 2 Remote 2 Temperature
150 3 Internal Temperature
151 4 PECI Processor Temperature 0
152 5 PECI Processor Temperature 1
153 6 PECI Processor Temperature 2
154 7 PECI Processor Temperature 3
155
156temp4_source
157 0 (default) peci_legacy = 0, PECI Processor Temperature 0
158 peci_legacy = 1, Remote 1 Temperature
159 1 Remote 1 Temperature
160 2 Remote 2 Temperature
161 3 Internal Temperature
162 4 PECI Processor Temperature 0
163 5 PECI Processor Temperature 1
164 6 PECI Processor Temperature 2
165 7 PECI Processor Temperature 3
166
167temp[1-4]_smoothing_enable
168temp[1-4]_smoothing_time
169 Smooths spikes in temp readings caused by noise.
170 Valid values in milliseconds are:
171 35000
172 17600
173 11800
174 7000
175 4400
176 3000
177 1600
178 800
179
180temp[1-4]_crit
181 When the corresponding zone temperature reaches this value,
182 ALL pwm outputs will got to 100%.
183
184temp[5-8]_input
185temp[5-8]_enable
186 The aSC7621 can also read temperatures provided by the processor
187 via the PECI bus. Usually these are "core" temps and are relative
188 to the point where the automatic thermal control circuit starts
189 throttling. This means that these are usually negative numbers.
190
191pwm[1-3]_enable
192 0 Fan off.
193 1 Fan on manual control.
194 2 Fan on automatic control and will run at the minimum pwm
195 if the temperature for the zone is below the minimum.
196 3 Fan on automatic control but will be off if the temperature
197 for the zone is below the minimum.
198 4-254 Ignored.
199 255 Fan on full.
200
201pwm[1-3]_auto_channels
202 Bitmap as described in sysctl-interface with the following
203 exceptions...
204 Only the following combination of zones (and their corresponding masks)
205 are valid:
206 1
207 2
208 3
209 2,3
210 1,2,3
211 4
212 1,2,3,4
213
214 Special values:
215 0 Disabled.
216 16 Fan on manual control.
217 31 Fan on full.
218
219
220pwm[1-3]_invert
221 When set, inverts the meaning of pwm[1-3].
222 i.e. when pwm = 0, the fan will be on full and
223 when pwm = 255 the fan will be off.
224
225pwm[1-3]_freq
226 PWM frequency in Hz
227 Valid values in Hz are:
228
229 10
230 15
231 23
232 30 (default)
233 38
234 47
235 62
236 94
237 23000
238 24000
239 25000
240 26000
241 27000
242 28000
243 29000
244 30000
245
246 Setting any other value will be ignored.
247
248peci_enable
249 Enables or disables PECI
250
251peci_avg
252 Input filter average time.
253
254 0 0 Sec. (no Smoothing) (default)
255 1 0.25 Sec.
256 2 0.5 Sec.
257 3 1.0 Sec.
258 4 2.0 Sec.
259 5 4.0 Sec.
260 6 8.0 Sec.
261 7 0.0 Sec.
262
263peci_legacy
264
265 0 Standard Mode (default)
266 Remote Diode 1 reading is associated with
267 Temperature Zone 1, PECI is associated with
268 Zone 4
269
270 1 Legacy Mode
271 PECI is associated with Temperature Zone 1,
272 Remote Diode 1 is associated with Zone 4
273
274peci_diode
275 Diode filter
276
277 0 0.25 Sec.
278 1 1.1 Sec.
279 2 2.4 Sec. (default)
280 3 3.4 Sec.
281 4 5.0 Sec.
282 5 6.8 Sec.
283 6 10.2 Sec.
284 7 16.4 Sec.
285
286peci_4domain
287 Four domain enable
288
289 0 1 or 2 Domains for enabled processors (default)
290 1 3 or 4 Domains for enabled processors
291
292peci_domain
293 Domain
294
295 0 Processor contains a single domain (0) (default)
296 1 Processor contains two domains (0,1)
diff --git a/Documentation/hwmon/it87 b/Documentation/hwmon/it87
index f9ba96c0ac4a..8d08bf0d38ed 100644
--- a/Documentation/hwmon/it87
+++ b/Documentation/hwmon/it87
@@ -5,31 +5,23 @@ Supported chips:
5 * IT8705F 5 * IT8705F
6 Prefix: 'it87' 6 Prefix: 'it87'
7 Addresses scanned: from Super I/O config space (8 I/O ports) 7 Addresses scanned: from Super I/O config space (8 I/O ports)
8 Datasheet: Publicly available at the ITE website 8 Datasheet: Once publicly available at the ITE website, but no longer
9 http://www.ite.com.tw/product_info/file/pc/IT8705F_V.0.4.1.pdf
10 * IT8712F 9 * IT8712F
11 Prefix: 'it8712' 10 Prefix: 'it8712'
12 Addresses scanned: from Super I/O config space (8 I/O ports) 11 Addresses scanned: from Super I/O config space (8 I/O ports)
13 Datasheet: Publicly available at the ITE website 12 Datasheet: Once publicly available at the ITE website, but no longer
14 http://www.ite.com.tw/product_info/file/pc/IT8712F_V0.9.1.pdf
15 http://www.ite.com.tw/product_info/file/pc/Errata%20V0.1%20for%20IT8712F%20V0.9.1.pdf
16 http://www.ite.com.tw/product_info/file/pc/IT8712F_V0.9.3.pdf
17 * IT8716F/IT8726F 13 * IT8716F/IT8726F
18 Prefix: 'it8716' 14 Prefix: 'it8716'
19 Addresses scanned: from Super I/O config space (8 I/O ports) 15 Addresses scanned: from Super I/O config space (8 I/O ports)
20 Datasheet: Publicly available at the ITE website 16 Datasheet: Once publicly available at the ITE website, but no longer
21 http://www.ite.com.tw/product_info/file/pc/IT8716F_V0.3.ZIP
22 http://www.ite.com.tw/product_info/file/pc/IT8726F_V0.3.pdf
23 * IT8718F 17 * IT8718F
24 Prefix: 'it8718' 18 Prefix: 'it8718'
25 Addresses scanned: from Super I/O config space (8 I/O ports) 19 Addresses scanned: from Super I/O config space (8 I/O ports)
26 Datasheet: Publicly available at the ITE website 20 Datasheet: Once publicly available at the ITE website, but no longer
27 http://www.ite.com.tw/product_info/file/pc/IT8718F_V0.2.zip
28 http://www.ite.com.tw/product_info/file/pc/IT8718F_V0%203_(for%20C%20version).zip
29 * IT8720F 21 * IT8720F
30 Prefix: 'it8720' 22 Prefix: 'it8720'
31 Addresses scanned: from Super I/O config space (8 I/O ports) 23 Addresses scanned: from Super I/O config space (8 I/O ports)
32 Datasheet: Not yet publicly available. 24 Datasheet: Not publicly available
33 * SiS950 [clone of IT8705F] 25 * SiS950 [clone of IT8705F]
34 Prefix: 'it87' 26 Prefix: 'it87'
35 Addresses scanned: from Super I/O config space (8 I/O ports) 27 Addresses scanned: from Super I/O config space (8 I/O ports)
@@ -136,6 +128,10 @@ registers are read whenever any data is read (unless it is less than 1.5
136seconds since the last update). This means that you can easily miss 128seconds since the last update). This means that you can easily miss
137once-only alarms. 129once-only alarms.
138 130
131Out-of-limit readings can also result in beeping, if the chip is properly
132wired and configured. Beeping can be enabled or disabled per sensor type
133(temperatures, voltages and fans.)
134
139The IT87xx only updates its values each 1.5 seconds; reading it more often 135The IT87xx only updates its values each 1.5 seconds; reading it more often
140will do no harm, but will return 'old' values. 136will do no harm, but will return 'old' values.
141 137
@@ -150,11 +146,38 @@ Fan speed control
150----------------- 146-----------------
151 147
152The fan speed control features are limited to manual PWM mode. Automatic 148The fan speed control features are limited to manual PWM mode. Automatic
153"Smart Guardian" mode control handling is not implemented. However 149"Smart Guardian" mode control handling is only implemented for older chips
154if you want to go for "manual mode" just write 1 to pwmN_enable. 150(see below.) However if you want to go for "manual mode" just write 1 to
151pwmN_enable.
155 152
156If you are only able to control the fan speed with very small PWM values, 153If you are only able to control the fan speed with very small PWM values,
157try lowering the PWM base frequency (pwm1_freq). Depending on the fan, 154try lowering the PWM base frequency (pwm1_freq). Depending on the fan,
158it may give you a somewhat greater control range. The same frequency is 155it may give you a somewhat greater control range. The same frequency is
159used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are 156used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are
160read-only. 157read-only.
158
159
160Automatic fan speed control (old interface)
161-------------------------------------------
162
163The driver supports the old interface to automatic fan speed control
164which is implemented by IT8705F chips up to revision F and IT8712F
165chips up to revision G.
166
167This interface implements 4 temperature vs. PWM output trip points.
168The PWM output of trip point 4 is always the maximum value (fan running
169at full speed) while the PWM output of the other 3 trip points can be
170freely chosen. The temperature of all 4 trip points can be freely chosen.
171Additionally, trip point 1 has an hysteresis temperature attached, to
172prevent fast switching between fan on and off.
173
174The chip automatically computes the PWM output value based on the input
175temperature, based on this simple rule: if the temperature value is
176between trip point N and trip point N+1 then the PWM output value is
177the one of trip point N. The automatic control mode is less flexible
178than the manual control mode, but it reacts faster, is more robust and
179doesn't use CPU cycles.
180
181Trip points must be set properly before switching to automatic fan speed
182control mode. The driver will perform basic integrity checks before
183actually switching to automatic control mode.
diff --git a/Documentation/hwmon/lm90 b/Documentation/hwmon/lm90
index 93d8e3d55150..6a03dd4bcc94 100644
--- a/Documentation/hwmon/lm90
+++ b/Documentation/hwmon/lm90
@@ -84,6 +84,10 @@ Supported chips:
84 Addresses scanned: I2C 0x4c 84 Addresses scanned: I2C 0x4c
85 Datasheet: Publicly available at the Maxim website 85 Datasheet: Publicly available at the Maxim website
86 http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3500 86 http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3500
87 * Winbond/Nuvoton W83L771AWG/ASG
88 Prefix: 'w83l771'
89 Addresses scanned: I2C 0x4c
90 Datasheet: Not publicly available, can be requested from Nuvoton
87 91
88 92
89Author: Jean Delvare <khali@linux-fr.org> 93Author: Jean Delvare <khali@linux-fr.org>
@@ -147,6 +151,12 @@ MAX6680 and MAX6681:
147 * Selectable address 151 * Selectable address
148 * Remote sensor type selection 152 * Remote sensor type selection
149 153
154W83L771AWG/ASG
155 * The AWG and ASG variants only differ in package format.
156 * Filter and alert configuration register at 0xBF
157 * Diode ideality factor configuration (remote sensor) at 0xE3
158 * Moving average (depending on conversion rate)
159
150All temperature values are given in degrees Celsius. Resolution 160All temperature values are given in degrees Celsius. Resolution
151is 1.0 degree for the local temperature, 0.125 degree for the remote 161is 1.0 degree for the local temperature, 0.125 degree for the remote
152temperature, except for the MAX6657, MAX6658 and MAX6659 which have a 162temperature, except for the MAX6657, MAX6658 and MAX6659 which have a
@@ -163,6 +173,18 @@ The lm90 driver will not update its values more frequently than every
163other second; reading them more often will do no harm, but will return 173other second; reading them more often will do no harm, but will return
164'old' values. 174'old' values.
165 175
176SMBus Alert Support
177-------------------
178
179This driver has basic support for SMBus alert. When an alert is received,
180the status register is read and the faulty temperature channel is logged.
181
182The Analog Devices chips (ADM1032 and ADT7461) do not implement the SMBus
183alert protocol properly so additional care is needed: the ALERT output is
184disabled when an alert is received, and is re-enabled only when the alarm
185is gone. Otherwise the chip would block alerts from other chips in the bus
186as long as the alarm is active.
187
166PEC Support 188PEC Support
167----------- 189-----------
168 190