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authorRudolf Marek <r.marek@sh.cvut.cz>2006-06-04 14:03:39 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2006-06-22 14:10:33 -0400
commit057bc350992fa2ac31fcd2ff80add269bdf32a80 (patch)
treee07c0d21c7f8f1df8dace43004bdd2c5aa0682de /Documentation
parent18f98b1e3147afdb51e545cc6ff2b016c7d088a7 (diff)
[PATCH] hwmon: Sysfs interface documentation update, 1 of 2
This patch cleans up hwmon sysfs documentation file, plus introduces the description of DC/PWM selection for fan speed control. Signed-off-by: Rudolf Marek <r.marek@sh.cvut.cz> Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/hwmon/sysfs-interface181
1 files changed, 107 insertions, 74 deletions
diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface
index eeb912254db..bc59a5113d1 100644
--- a/Documentation/hwmon/sysfs-interface
+++ b/Documentation/hwmon/sysfs-interface
@@ -69,28 +69,37 @@ to cause an alarm) is chip-dependent.
69 69
70------------------------------------------------------------------------- 70-------------------------------------------------------------------------
71 71
72[0-*] denotes any positive number starting from 0
73[1-*] denotes any positive number starting from 1
74RO read only value
75RW read/write value
76
77Read/write values may be read-only for some chips, depending on the
78hardware implementation.
79
72************ 80************
73* Voltages * 81* Voltages *
74************ 82************
75 83
76in[0-8]_min Voltage min value. 84in[0-*]_min Voltage min value.
77 Unit: millivolt 85 Unit: millivolt
78 Read/Write 86 RW
79 87
80in[0-8]_max Voltage max value. 88in[0-*]_max Voltage max value.
81 Unit: millivolt 89 Unit: millivolt
82 Read/Write 90 RW
83 91
84in[0-8]_input Voltage input value. 92in[0-*]_input Voltage input value.
85 Unit: millivolt 93 Unit: millivolt
86 Read only 94 RO
95 Voltage measured on the chip pin.
87 Actual voltage depends on the scaling resistors on the 96 Actual voltage depends on the scaling resistors on the
88 motherboard, as recommended in the chip datasheet. 97 motherboard, as recommended in the chip datasheet.
89 This varies by chip and by motherboard. 98 This varies by chip and by motherboard.
90 Because of this variation, values are generally NOT scaled 99 Because of this variation, values are generally NOT scaled
91 by the chip driver, and must be done by the application. 100 by the chip driver, and must be done by the application.
92 However, some drivers (notably lm87 and via686a) 101 However, some drivers (notably lm87 and via686a)
93 do scale, with various degrees of success. 102 do scale, because of internal resistors built into a chip.
94 These drivers will output the actual voltage. 103 These drivers will output the actual voltage.
95 104
96 Typical usage: 105 Typical usage:
@@ -104,58 +113,72 @@ in[0-8]_input Voltage input value.
104 in7_* varies 113 in7_* varies
105 in8_* varies 114 in8_* varies
106 115
107cpu[0-1]_vid CPU core reference voltage. 116cpu[0-*]_vid CPU core reference voltage.
108 Unit: millivolt 117 Unit: millivolt
109 Read only. 118 RO
110 Not always correct. 119 Not always correct.
111 120
112vrm Voltage Regulator Module version number. 121vrm Voltage Regulator Module version number.
113 Read only. 122 RW (but changing it should no more be necessary)
114 Two digit number, first is major version, second is 123 Originally the VRM standard version multiplied by 10, but now
115 minor version. 124 an arbitrary number, as not all standards have a version
125 number.
116 Affects the way the driver calculates the CPU core reference 126 Affects the way the driver calculates the CPU core reference
117 voltage from the vid pins. 127 voltage from the vid pins.
118 128
129Also see the Alarms section for status flags associated with voltages.
130
119 131
120******** 132********
121* Fans * 133* Fans *
122******** 134********
123 135
124fan[1-3]_min Fan minimum value 136fan[1-*]_min Fan minimum value
125 Unit: revolution/min (RPM) 137 Unit: revolution/min (RPM)
126 Read/Write. 138 RW
127 139
128fan[1-3]_input Fan input value. 140fan[1-*]_input Fan input value.
129 Unit: revolution/min (RPM) 141 Unit: revolution/min (RPM)
130 Read only. 142 RO
131 143
132fan[1-3]_div Fan divisor. 144fan[1-*]_div Fan divisor.
133 Integer value in powers of two (1, 2, 4, 8, 16, 32, 64, 128). 145 Integer value in powers of two (1, 2, 4, 8, 16, 32, 64, 128).
146 RW
134 Some chips only support values 1, 2, 4 and 8. 147 Some chips only support values 1, 2, 4 and 8.
135 Note that this is actually an internal clock divisor, which 148 Note that this is actually an internal clock divisor, which
136 affects the measurable speed range, not the read value. 149 affects the measurable speed range, not the read value.
137 150
151Also see the Alarms section for status flags associated with fans.
152
153
138******* 154*******
139* PWM * 155* PWM *
140******* 156*******
141 157
142pwm[1-3] Pulse width modulation fan control. 158pwm[1-*] Pulse width modulation fan control.
143 Integer value in the range 0 to 255 159 Integer value in the range 0 to 255
144 Read/Write 160 RW
145 255 is max or 100%. 161 255 is max or 100%.
146 162
147pwm[1-3]_enable 163pwm[1-*]_enable
148 Switch PWM on and off. 164 Switch PWM on and off.
149 Not always present even if fan*_pwm is. 165 Not always present even if fan*_pwm is.
150 0 to turn off 166 0: turn off
151 1 to turn on in manual mode 167 1: turn on in manual mode
152 2 to turn on in automatic mode 168 2+: turn on in automatic mode
153 Read/Write 169 Check individual chip documentation files for automatic mode details.
170 RW
171
172pwm[1-*]_mode
173 0: DC mode
174 1: PWM mode
175 RW
154 176
155pwm[1-*]_auto_channels_temp 177pwm[1-*]_auto_channels_temp
156 Select which temperature channels affect this PWM output in 178 Select which temperature channels affect this PWM output in
157 auto mode. Bitfield, 1 is temp1, 2 is temp2, 4 is temp3 etc... 179 auto mode. Bitfield, 1 is temp1, 2 is temp2, 4 is temp3 etc...
158 Which values are possible depend on the chip used. 180 Which values are possible depend on the chip used.
181 RW
159 182
160pwm[1-*]_auto_point[1-*]_pwm 183pwm[1-*]_auto_point[1-*]_pwm
161pwm[1-*]_auto_point[1-*]_temp 184pwm[1-*]_auto_point[1-*]_temp
@@ -163,6 +186,7 @@ pwm[1-*]_auto_point[1-*]_temp_hyst
163 Define the PWM vs temperature curve. Number of trip points is 186 Define the PWM vs temperature curve. Number of trip points is
164 chip-dependent. Use this for chips which associate trip points 187 chip-dependent. Use this for chips which associate trip points
165 to PWM output channels. 188 to PWM output channels.
189 RW
166 190
167OR 191OR
168 192
@@ -172,51 +196,52 @@ temp[1-*]_auto_point[1-*]_temp_hyst
172 Define the PWM vs temperature curve. Number of trip points is 196 Define the PWM vs temperature curve. Number of trip points is
173 chip-dependent. Use this for chips which associate trip points 197 chip-dependent. Use this for chips which associate trip points
174 to temperature channels. 198 to temperature channels.
199 RW
175 200
176 201
177**************** 202****************
178* Temperatures * 203* Temperatures *
179**************** 204****************
180 205
181temp[1-3]_type Sensor type selection. 206temp[1-*]_type Sensor type selection.
182 Integers 1 to 4 or thermistor Beta value (typically 3435) 207 Integers 1 to 4 or thermistor Beta value (typically 3435)
183 Read/Write. 208 RW
184 1: PII/Celeron Diode 209 1: PII/Celeron Diode
185 2: 3904 transistor 210 2: 3904 transistor
186 3: thermal diode 211 3: thermal diode
187 4: thermistor (default/unknown Beta) 212 4: thermistor (default/unknown Beta)
188 Not all types are supported by all chips 213 Not all types are supported by all chips
189 214
190temp[1-4]_max Temperature max value. 215temp[1-*]_max Temperature max value.
191 Unit: millidegree Celcius 216 Unit: millidegree Celcius
192 Read/Write value. 217 RW
193 218
194temp[1-3]_min Temperature min value. 219temp[1-*]_min Temperature min value.
195 Unit: millidegree Celcius 220 Unit: millidegree Celcius
196 Read/Write value. 221 RW
197 222
198temp[1-3]_max_hyst 223temp[1-*]_max_hyst
199 Temperature hysteresis value for max limit. 224 Temperature hysteresis value for max limit.
200 Unit: millidegree Celcius 225 Unit: millidegree Celcius
201 Must be reported as an absolute temperature, NOT a delta 226 Must be reported as an absolute temperature, NOT a delta
202 from the max value. 227 from the max value.
203 Read/Write value. 228 RW
204 229
205temp[1-4]_input Temperature input value. 230temp[1-*]_input Temperature input value.
206 Unit: millidegree Celcius 231 Unit: millidegree Celcius
207 Read only value. 232 RO
208 233
209temp[1-4]_crit Temperature critical value, typically greater than 234temp[1-*]_crit Temperature critical value, typically greater than
210 corresponding temp_max values. 235 corresponding temp_max values.
211 Unit: millidegree Celcius 236 Unit: millidegree Celcius
212 Read/Write value. 237 RW
213 238
214temp[1-2]_crit_hyst 239temp[1-*]_crit_hyst
215 Temperature hysteresis value for critical limit. 240 Temperature hysteresis value for critical limit.
216 Unit: millidegree Celcius 241 Unit: millidegree Celcius
217 Must be reported as an absolute temperature, NOT a delta 242 Must be reported as an absolute temperature, NOT a delta
218 from the critical value. 243 from the critical value.
219 Read/Write value. 244 RW
220 245
221temp[1-4]_offset 246temp[1-4]_offset
222 Temperature offset which is added to the temperature reading 247 Temperature offset which is added to the temperature reading
@@ -231,6 +256,8 @@ temp[1-4]_offset
231 itself, for example the thermal diode inside the CPU or 256 itself, for example the thermal diode inside the CPU or
232 a thermistor nearby. 257 a thermistor nearby.
233 258
259Also see the Alarms section for status flags associated with temperatures.
260
234 261
235************ 262************
236* Currents * 263* Currents *
@@ -239,17 +266,17 @@ temp[1-4]_offset
239Note that no known chip provides current measurements as of writing, 266Note that no known chip provides current measurements as of writing,
240so this part is theoretical, so to say. 267so this part is theoretical, so to say.
241 268
242curr[1-n]_max Current max value 269curr[1-*]_max Current max value
243 Unit: milliampere 270 Unit: milliampere
244 Read/Write. 271 RW
245 272
246curr[1-n]_min Current min value. 273curr[1-*]_min Current min value.
247 Unit: milliampere 274 Unit: milliampere
248 Read/Write. 275 RW
249 276
250curr[1-n]_input Current input value 277curr[1-*]_input Current input value
251 Unit: milliampere 278 Unit: milliampere
252 Read only. 279 RO
253 280
254 281
255********** 282**********
@@ -263,50 +290,54 @@ Usually a given chip will either use channel-related alarms, or
263limit-related alarms, not both. The driver should just reflect the hardware 290limit-related alarms, not both. The driver should just reflect the hardware
264implementation. 291implementation.
265 292
266in[0-n]_alarm 293in[0-*]_alarm
267fan[1-n]_alarm 294fan[1-*]_alarm
268temp[1-n]_alarm 295temp[1-*]_alarm
269 Channel alarm 296 Channel alarm
270 Boolean 297 0: no alarm
271 Read-only 298 1: alarm
299 RO
272 300
273OR 301OR
274 302
275in[0-n]_min_alarm 303in[0-*]_min_alarm
276in[0-n]_max_alarm 304in[0-*]_max_alarm
277fan[1-n]_min_alarm 305fan[1-*]_min_alarm
278temp[1-n]_min_alarm 306temp[1-*]_min_alarm
279temp[1-n]_max_alarm 307temp[1-*]_max_alarm
280temp[1-n]_crit_alarm 308temp[1-*]_crit_alarm
281 Limit alarm 309 Limit alarm
282 Boolean 310 0: no alarm
283 Read-only 311 1: alarm
312 RO
284 313
285Each input channel may have an associated fault file. This can be used 314Each input channel may have an associated fault file. This can be used
286to notify open diodes, unconnected fans etc. where the hardware 315to notify open diodes, unconnected fans etc. where the hardware
287supports it. When this boolean has value 1, the measurement for that 316supports it. When this boolean has value 1, the measurement for that
288channel should not be trusted. 317channel should not be trusted.
289 318
290in[0-n]_input_fault 319in[0-*]_input_fault
291fan[1-n]_input_fault 320fan[1-*]_input_fault
292temp[1-n]_input_fault 321temp[1-*]_input_fault
293 Input fault condition 322 Input fault condition
294 Boolean 323 0: no fault occured
295 Read-only 324 1: fault condition
325 RO
296 326
297Some chips also offer the possibility to get beeped when an alarm occurs: 327Some chips also offer the possibility to get beeped when an alarm occurs:
298 328
299beep_enable Master beep enable 329beep_enable Master beep enable
300 Boolean 330 0: no beeps
301 Read/Write 331 1: beeps
332 RW
302 333
303in[0-n]_beep 334in[0-*]_beep
304fan[1-n]_beep 335fan[1-*]_beep
305temp[1-n]_beep 336temp[1-*]_beep
306 Channel beep 337 Channel beep
307 0 to disable. 338 0: disable
308 1 to enable. 339 1: enable
309 Read/write 340 RW
310 341
311In theory, a chip could provide per-limit beep masking, but no such chip 342In theory, a chip could provide per-limit beep masking, but no such chip
312was seen so far. 343was seen so far.
@@ -316,7 +347,7 @@ beeps. These interface files are deprecated, but will be kept around
316for compatibility reasons: 347for compatibility reasons:
317 348
318alarms Alarm bitmask. 349alarms Alarm bitmask.
319 Read only. 350 RO
320 Integer representation of one to four bytes. 351 Integer representation of one to four bytes.
321 A '1' bit means an alarm. 352 A '1' bit means an alarm.
322 Chips should be programmed for 'comparator' mode so that 353 Chips should be programmed for 'comparator' mode so that
@@ -333,7 +364,7 @@ beep_mask Bitmask for beep.
333 Same format as 'alarms' with the same bit locations, 364 Same format as 'alarms' with the same bit locations,
334 use discouraged for the same reason. Use individual 365 use discouraged for the same reason. Use individual
335 *_beep files instead. 366 *_beep files instead.
336 Read/Write 367 RW
337 368
338 369
339********* 370*********
@@ -341,7 +372,9 @@ beep_mask Bitmask for beep.
341********* 372*********
342 373
343eeprom Raw EEPROM data in binary form. 374eeprom Raw EEPROM data in binary form.
344 Read only. 375 RO
345 376
346pec Enable or disable PEC (SMBus only) 377pec Enable or disable PEC (SMBus only)
347 Read/Write 378 0: disable
379 1: enable
380 RW