5 * SMSC DME1737 and compatibles (like Asus A8000)
7 Addresses scanned: I2C 0x2c, 0x2d, 0x2e
8 Datasheet: Provided by SMSC upon request and under NDA
9 * SMSC SCH3112, SCH3114, SCH3116
11 Addresses scanned: none, address read from Super-I/O config space
12 Datasheet: Available on the Internet
15 Addresses scanned: I2C 0x2c, 0x2d, 0x2e
16 Datasheet: Provided by SMSC upon request and under NDA
19 Addresses scanned: none, address read from Super-I/O config space
20 Datasheet: Provided by SMSC upon request and under NDA
23 Juerg Haefliger <juergh@gmail.com>
29 * force_start: bool Enables the monitoring of voltage, fan and temp inputs
30 and PWM output control functions. Using this parameter
31 shouldn't be required since the BIOS usually takes care
33 * probe_all_addr: bool Include non-standard LPC addresses 0x162e and 0x164e
34 when probing for ISA devices. This is required for the
42 This driver implements support for the hardware monitoring capabilities of the
43 SMSC DME1737 and Asus A8000 (which are the same), SMSC SCH5027, SCH311x,
44 and SCH5127 Super-I/O chips. These chips feature monitoring of 3 temp sensors
45 temp[1-3] (2 remote diodes and 1 internal), 7 voltages in[0-6] (6 external and
46 1 internal) and up to 6 fan speeds fan[1-6]. Additionally, the chips implement
47 up to 5 PWM outputs pwm[1-3,5-6] for controlling fan speeds both manually and
50 For the DME1737, A8000 and SCH5027, fan[1-2] and pwm[1-2] are always present.
51 Fan[3-6] and pwm[3,5-6] are optional features and their availability depends on
52 the configuration of the chip. The driver will detect which features are
53 present during initialization and create the sysfs attributes accordingly.
55 For the SCH311x and SCH5127, fan[1-3] and pwm[1-3] are always present and
56 fan[4-6] and pwm[5-6] don't exist.
58 The hardware monitoring features of the DME1737, A8000, and SCH5027 are only
59 accessible via SMBus, while the SCH311x and SCH5127 only provide access via
60 the ISA bus. The driver will therefore register itself as an I2C client driver
61 if it detects a DME1737, A8000, or SCH5027 and as a platform driver if it
62 detects a SCH311x or SCH5127 chip.
68 The voltage inputs are sampled with 12-bit resolution and have internal
69 scaling resistors. The values returned by the driver therefore reflect true
70 millivolts and don't need scaling. The voltage inputs are mapped as follows
71 (the last column indicates the input ranges):
74 in0: +5VTR (+5V standby) 0V - 6.64V
75 in1: Vccp (processor core) 0V - 3V
76 in2: VCC (internal +3.3V) 0V - 4.38V
79 in5: VTR (+3.3V standby) 0V - 4.38V
80 in6: Vbat (+3.0V) 0V - 4.38V
84 in1: Vccp (processor core) 0V - 2V
85 in2: VCC (internal +3.3V) 0V - 4.38V
88 in5: VTR (+3.3V standby) 0V - 4.38V
89 in6: Vbat (+3.0V) 0V - 4.38V
92 in0: +5VTR (+5V standby) 0V - 6.64V
93 in1: Vccp (processor core) 0V - 3V
94 in2: VCC (internal +3.3V) 0V - 4.38V
97 in5: VTR (+3.3V standby) 0V - 4.38V
98 in6: Vbat (+3.0V) 0V - 4.38V
102 in1: Vccp (processor core) 0V - 3V
103 in2: VCC (internal +3.3V) 0V - 4.38V
106 in5: VTR (+3.3V standby) 0V - 4.38V
107 in6: Vbat (+3.0V) 0V - 4.38V
109 Each voltage input has associated min and max limits which trigger an alarm
113 Temperature Monitoring
114 ----------------------
116 Temperatures are measured with 12-bit resolution and reported in millidegree
117 Celsius. The chip also features offsets for all 3 temperature inputs which -
118 when programmed - get added to the input readings. The chip does all the
119 scaling by itself and the driver therefore reports true temperatures that don't
120 need any user-space adjustments. The temperature inputs are mapped as follows
121 (the last column indicates the input ranges):
123 temp1: Remote diode 1 (3904 type) temperature -127C - +127C
124 temp2: DME1737 internal temperature -127C - +127C
125 temp3: Remote diode 2 (3904 type) temperature -127C - +127C
127 Each temperature input has associated min and max limits which trigger an alarm
128 when crossed. Additionally, each temperature input has a fault attribute that
129 returns 1 when a faulty diode or an unconnected input is detected and 0
136 Fan RPMs are measured with 16-bit resolution. The chip provides inputs for 6
137 fan tachometers. All 6 inputs have an associated min limit which triggers an
138 alarm when crossed. Fan inputs 1-4 provide type attributes that need to be set
139 to the number of pulses per fan revolution that the connected tachometer
140 generates. Supported values are 1, 2, and 4. Fan inputs 5-6 only support fans
141 that generate 2 pulses per revolution. Fan inputs 5-6 also provide a max
142 attribute that needs to be set to the maximum attainable RPM (fan at 100% duty-
143 cycle) of the input. The chip adjusts the sampling rate based on this value.
149 This chip features 5 PWM outputs. PWM outputs 1-3 are associated with fan
150 inputs 1-3 and PWM outputs 5-6 are associated with fan inputs 5-6. PWM outputs
151 1-3 can be configured to operate either in manual or automatic mode by setting
152 the appropriate enable attribute accordingly. PWM outputs 5-6 can only operate
153 in manual mode, their enable attributes are therefore read-only. When set to
154 manual mode, the fan speed is set by writing the duty-cycle value to the
155 appropriate PWM attribute. In automatic mode, the PWM attribute returns the
156 current duty-cycle as set by the fan controller in the chip. All PWM outputs
157 support the setting of the output frequency via the freq attribute.
159 In automatic mode, the chip supports the setting of the PWM ramp rate which
160 defines how fast the PWM output is adjusting to changes of the associated
161 temperature input. Associating PWM outputs to temperature inputs is done via
162 temperature zones. The chip features 3 zones whose assignments to temperature
163 inputs is static and determined during initialization. These assignments can
164 be retrieved via the zone[1-3]_auto_channels_temp attributes. Each PWM output
165 is assigned to one (or hottest of multiple) temperature zone(s) through the
166 pwm[1-3]_auto_channels_zone attributes. Each PWM output has 3 distinct output
167 duty-cycles: full, low, and min. Full is internally hard-wired to 255 (100%)
168 and low and min can be programmed via pwm[1-3]_auto_point1_pwm and
169 pwm[1-3]_auto_pwm_min, respectively. The thermal thresholds of the zones are
170 programmed via zone[1-3]_auto_point[1-3]_temp and
171 zone[1-3]_auto_point1_temp_hyst:
173 pwm[1-3]_auto_point2_pwm full-speed duty-cycle (255, i.e., 100%)
174 pwm[1-3]_auto_point1_pwm low-speed duty-cycle
175 pwm[1-3]_auto_pwm_min min-speed duty-cycle
177 zone[1-3]_auto_point3_temp full-speed temp (all outputs)
178 zone[1-3]_auto_point2_temp full-speed temp
179 zone[1-3]_auto_point1_temp low-speed temp
180 zone[1-3]_auto_point1_temp_hyst min-speed temp
182 The chip adjusts the output duty-cycle linearly in the range of auto_point1_pwm
183 to auto_point2_pwm if the temperature of the associated zone is between
184 auto_point1_temp and auto_point2_temp. If the temperature drops below the
185 auto_point1_temp_hyst value, the output duty-cycle is set to the auto_pwm_min
186 value which only supports two values: 0 or auto_point1_pwm. That means that the
187 fan either turns completely off or keeps spinning with the low-speed
188 duty-cycle. If any of the temperatures rise above the auto_point3_temp value,
189 all PWM outputs are set to 100% duty-cycle.
191 Following is another representation of how the chip sets the output duty-cycle
192 based on the temperature of the associated thermal zone:
194 Duty-Cycle Duty-Cycle
195 Temperature Rising Temp Falling Temp
196 ----------- ----------- ------------
197 full-speed full-speed full-speed
199 < linearly adjusted duty-cycle >
201 low-speed low-speed low-speed
203 min-speed min-speed min-speed
210 Following is a list of all sysfs attributes that the driver provides, their
211 permissions and a short description:
213 Name Perm Description
214 ---- ---- -----------
215 cpu0_vid RO CPU core reference voltage in
217 vrm RW Voltage regulator module version
220 in[0-6]_input RO Measured voltage in millivolts.
221 in[0-6]_min RW Low limit for voltage input.
222 in[0-6]_max RW High limit for voltage input.
223 in[0-6]_alarm RO Voltage input alarm. Returns 1 if
224 voltage input is or went outside the
225 associated min-max range, 0 otherwise.
227 temp[1-3]_input RO Measured temperature in millidegree
229 temp[1-3]_min RW Low limit for temp input.
230 temp[1-3]_max RW High limit for temp input.
231 temp[1-3]_offset RW Offset for temp input. This value will
232 be added by the chip to the measured
234 temp[1-3]_alarm RO Alarm for temp input. Returns 1 if temp
235 input is or went outside the associated
236 min-max range, 0 otherwise.
237 temp[1-3]_fault RO Temp input fault. Returns 1 if the chip
238 detects a faulty thermal diode or an
239 unconnected temp input, 0 otherwise.
241 zone[1-3]_auto_channels_temp RO Temperature zone to temperature input
242 mapping. This attribute is a bitfield
243 and supports the following values:
247 zone[1-3]_auto_point1_temp_hyst RW Auto PWM temp point1 hysteresis. The
248 output of the corresponding PWM is set
249 to the pwm_auto_min value if the temp
250 falls below the auto_point1_temp_hyst
252 zone[1-3]_auto_point[1-3]_temp RW Auto PWM temp points. Auto_point1 is
253 the low-speed temp, auto_point2 is the
254 full-speed temp, and auto_point3 is the
255 temp at which all PWM outputs are set
256 to full-speed (100% duty-cycle).
258 fan[1-6]_input RO Measured fan speed in RPM.
259 fan[1-6]_min RW Low limit for fan input.
260 fan[1-6]_alarm RO Alarm for fan input. Returns 1 if fan
261 input is or went below the associated
262 min value, 0 otherwise.
263 fan[1-4]_type RW Type of attached fan. Expressed in
264 number of pulses per revolution that
265 the fan generates. Supported values are
267 fan[5-6]_max RW Max attainable RPM at 100% duty-cycle.
268 Required for chip to adjust the
269 sampling rate accordingly.
271 pmw[1-3,5-6] RO/RW Duty-cycle of PWM output. Supported
272 values are 0-255 (0%-100%). Only
273 writeable if the associated PWM is in
275 pwm[1-3]_enable RW Enable of PWM outputs 1-3. Supported
277 0: turned off (output @ 100%)
280 pwm[5-6]_enable RO Enable of PWM outputs 5-6. Always
281 returns 1 since these 2 outputs are
282 hard-wired to manual mode.
283 pmw[1-3,5-6]_freq RW Frequency of PWM output. Supported
284 values are in the range 11Hz-30000Hz
285 (default is 25000Hz).
286 pmw[1-3]_ramp_rate RW Ramp rate of PWM output. Determines how
287 fast the PWM duty-cycle will change
288 when the PWM is in automatic mode.
289 Expressed in ms per PWM step. Supported
290 values are in the range 0ms-206ms
291 (default is 0, which means the duty-
292 cycle changes instantly).
293 pwm[1-3]_auto_channels_zone RW PWM output to temperature zone mapping.
294 This attribute is a bitfield and
295 supports the following values:
299 6: highest of zone[2-3]
300 7: highest of zone[1-3]
301 pwm[1-3]_auto_pwm_min RW Auto PWM min pwm. Minimum PWM duty-
302 cycle. Supported values are 0 or
304 pwm[1-3]_auto_point1_pwm RW Auto PWM pwm point. Auto_point1 is the
305 low-speed duty-cycle.
306 pwm[1-3]_auto_point2_pwm RO Auto PWM pwm point. Auto_point2 is the
307 full-speed duty-cycle which is hard-
308 wired to 255 (100% duty-cycle).
313 Feature dme1737 sch311x sch5027 sch5127
314 -------------------------------------------------------
315 temp[1-3]_offset yes yes
318 zone[1-3]_hyst yes yes