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
11 Juerg Haefliger <juergh@gmail.com>
17 * force_start: bool Enables the monitoring of voltage, fan and temp inputs
18 and PWM output control functions. Using this parameter
19 shouldn't be required since the BIOS usually takes care
22 Note that there is no need to use this parameter if the driver loads without
23 complaining. The driver will say so if it is necessary.
29 This driver implements support for the hardware monitoring capabilities of the
30 SMSC DME1737 and Asus A8000 (which are the same) Super-I/O chips. This chip
31 features monitoring of 3 temp sensors temp[1-3] (2 remote diodes and 1
32 internal), 7 voltages in[0-6] (6 external and 1 internal) and 6 fan speeds
33 fan[1-6]. Additionally, the chip implements 5 PWM outputs pwm[1-3,5-6] for
34 controlling fan speeds both manually and automatically.
36 Fan[3-6] and pwm[3,5-6] are optional features and their availability is
37 dependent on the configuration of the chip. The driver will detect which
38 features are present during initialization and create the sysfs attributes
45 The voltage inputs are sampled with 12-bit resolution and have internal
46 scaling resistors. The values returned by the driver therefore reflect true
47 millivolts and don't need scaling. The voltage inputs are mapped as follows
48 (the last column indicates the input ranges):
50 in0: +5VTR (+5V standby) 0V - 6.64V
51 in1: Vccp (processor core) 0V - 3V
52 in2: VCC (internal +3.3V) 0V - 4.38V
55 in5: VTR (+3.3V standby) 0V - 4.38V
56 in6: Vbat (+3.0V) 0V - 4.38V
58 Each voltage input has associated min and max limits which trigger an alarm
62 Temperature Monitoring
63 ----------------------
65 Temperatures are measured with 12-bit resolution and reported in millidegree
66 Celsius. The chip also features offsets for all 3 temperature inputs which -
67 when programmed - get added to the input readings. The chip does all the
68 scaling by itself and the driver therefore reports true temperatures that don't
69 need any user-space adjustments. The temperature inputs are mapped as follows
70 (the last column indicates the input ranges):
72 temp1: Remote diode 1 (3904 type) temperature -127C - +127C
73 temp2: DME1737 internal temperature -127C - +127C
74 temp3: Remote diode 2 (3904 type) temperature -127C - +127C
76 Each temperature input has associated min and max limits which trigger an alarm
77 when crossed. Additionally, each temperature input has a fault attribute that
78 returns 1 when a faulty diode or an unconnected input is detected and 0
85 Fan RPMs are measured with 16-bit resolution. The chip provides inputs for 6
86 fan tachometers. All 6 inputs have an associated min limit which triggers an
87 alarm when crossed. Fan inputs 1-4 provide type attributes that need to be set
88 to the number of pulses per fan revolution that the connected tachometer
89 generates. Supported values are 1, 2, and 4. Fan inputs 5-6 only support fans
90 that generate 2 pulses per revolution. Fan inputs 5-6 also provide a max
91 attribute that needs to be set to the maximum attainable RPM (fan at 100% duty-
92 cycle) of the input. The chip adjusts the sampling rate based on this value.
98 This chip features 5 PWM outputs. PWM outputs 1-3 are associated with fan
99 inputs 1-3 and PWM outputs 5-6 are associated with fan inputs 5-6. PWM outputs
100 1-3 can be configured to operate either in manual or automatic mode by setting
101 the appropriate enable attribute accordingly. PWM outputs 5-6 can only operate
102 in manual mode, their enable attributes are therefore read-only. When set to
103 manual mode, the fan speed is set by writing the duty-cycle value to the
104 appropriate PWM attribute. In automatic mode, the PWM attribute returns the
105 current duty-cycle as set by the fan controller in the chip. All PWM outputs
106 support the setting of the output frequency via the freq attribute.
108 In automatic mode, the chip supports the setting of the PWM ramp rate which
109 defines how fast the PWM output is adjusting to changes of the associated
110 temperature input. Associating PWM outputs to temperature inputs is done via
111 temperature zones. The chip features 3 zones whose assignments to temperature
112 inputs is static and determined during initialization. These assignments can
113 be retrieved via the zone[1-3]_auto_channels_temp attributes. Each PWM output
114 is assigned to one (or hottest of multiple) temperature zone(s) through the
115 pwm[1-3]_auto_channels_zone attributes. Each PWM output has 3 distinct output
116 duty-cycles: full, low, and min. Full is internally hard-wired to 255 (100%)
117 and low and min can be programmed via pwm[1-3]_auto_point1_pwm and
118 pwm[1-3]_auto_pwm_min, respectively. The thermal thresholds of the zones are
119 programmed via zone[1-3]_auto_point[1-3]_temp and
120 zone[1-3]_auto_point1_temp_hyst:
122 pwm[1-3]_auto_point2_pwm full-speed duty-cycle (255, i.e., 100%)
123 pwm[1-3]_auto_point1_pwm low-speed duty-cycle
124 pwm[1-3]_auto_pwm_min min-speed duty-cycle
126 zone[1-3]_auto_point3_temp full-speed temp (all outputs)
127 zone[1-3]_auto_point2_temp full-speed temp
128 zone[1-3]_auto_point1_temp low-speed temp
129 zone[1-3]_auto_point1_temp_hyst min-speed temp
131 The chip adjusts the output duty-cycle linearly in the range of auto_point1_pwm
132 to auto_point2_pwm if the temperature of the associated zone is between
133 auto_point1_temp and auto_point2_temp. If the temperature drops below the
134 auto_point1_temp_hyst value, the output duty-cycle is set to the auto_pwm_min
135 value which only supports two values: 0 or auto_point1_pwm. That means that the
136 fan either turns completely off or keeps spinning with the low-speed
137 duty-cycle. If any of the temperatures rise above the auto_point3_temp value,
138 all PWM outputs are set to 100% duty-cycle.
140 Following is another representation of how the chip sets the output duty-cycle
141 based on the temperature of the associated thermal zone:
143 Duty-Cycle Duty-Cycle
144 Temperature Rising Temp Falling Temp
145 ----------- ----------- ------------
146 full-speed full-speed full-speed
148 < linearly adjusted duty-cycle >
150 low-speed low-speed low-speed
152 min-speed min-speed min-speed
159 Following is a list of all sysfs attributes that the driver provides, their
160 permissions and a short description:
162 Name Perm Description
163 ---- ---- -----------
164 cpu0_vid RO CPU core reference voltage in
166 vrm RW Voltage regulator module version
169 in[0-6]_input RO Measured voltage in millivolts.
170 in[0-6]_min RW Low limit for voltage input.
171 in[0-6]_max RW High limit for voltage input.
172 in[0-6]_alarm RO Voltage input alarm. Returns 1 if
173 voltage input is or went outside the
174 associated min-max range, 0 otherwise.
176 temp[1-3]_input RO Measured temperature in millidegree
178 temp[1-3]_min RW Low limit for temp input.
179 temp[1-3]_max RW High limit for temp input.
180 temp[1-3]_offset RW Offset for temp input. This value will
181 be added by the chip to the measured
183 temp[1-3]_alarm RO Alarm for temp input. Returns 1 if temp
184 input is or went outside the associated
185 min-max range, 0 otherwise.
186 temp[1-3]_fault RO Temp input fault. Returns 1 if the chip
187 detects a faulty thermal diode or an
188 unconnected temp input, 0 otherwise.
190 zone[1-3]_auto_channels_temp RO Temperature zone to temperature input
191 mapping. This attribute is a bitfield
192 and supports the following values:
196 zone[1-3]_auto_point1_temp_hyst RW Auto PWM temp point1 hysteresis. The
197 output of the corresponding PWM is set
198 to the pwm_auto_min value if the temp
199 falls below the auto_point1_temp_hyst
201 zone[1-3]_auto_point[1-3]_temp RW Auto PWM temp points. Auto_point1 is
202 the low-speed temp, auto_point2 is the
203 full-speed temp, and auto_point3 is the
204 temp at which all PWM outputs are set
205 to full-speed (100% duty-cycle).
207 fan[1-6]_input RO Measured fan speed in RPM.
208 fan[1-6]_min RW Low limit for fan input.
209 fan[1-6]_alarm RO Alarm for fan input. Returns 1 if fan
210 input is or went below the associated
211 min value, 0 otherwise.
212 fan[1-4]_type RW Type of attached fan. Expressed in
213 number of pulses per revolution that
214 the fan generates. Supported values are
216 fan[5-6]_max RW Max attainable RPM at 100% duty-cycle.
217 Required for chip to adjust the
218 sampling rate accordingly.
220 pmw[1-3,5-6] RO/RW Duty-cycle of PWM output. Supported
221 values are 0-255 (0%-100%). Only
222 writeable if the associated PWM is in
224 pwm[1-3]_enable RW Enable of PWM outputs 1-3. Supported
226 0: turned off (output @ 100%)
229 pwm[5-6]_enable RO Enable of PWM outputs 5-6. Always
230 returns 1 since these 2 outputs are
231 hard-wired to manual mode.
232 pmw[1-3,5-6]_freq RW Frequency of PWM output. Supported
233 values are in the range 11Hz-30000Hz
234 (default is 25000Hz).
235 pmw[1-3]_ramp_rate RW Ramp rate of PWM output. Determines how
236 fast the PWM duty-cycle will change
237 when the PWM is in automatic mode.
238 Expressed in ms per PWM step. Supported
239 values are in the range 0ms-206ms
240 (default is 0, which means the duty-
241 cycle changes instantly).
242 pwm[1-3]_auto_channels_zone RW PWM output to temperature zone mapping.
243 This attribute is a bitfield and
244 supports the following values:
248 6: highest of zone[2-3]
249 7: highest of zone[1-3]
250 pwm[1-3]_auto_pwm_min RW Auto PWM min pwm. Minimum PWM duty-
251 cycle. Supported values are 0 or
253 pwm[1-3]_auto_point1_pwm RW Auto PWM pwm point. Auto_point1 is the
254 low-speed duty-cycle.
255 pwm[1-3]_auto_point2_pwm RO Auto PWM pwm point. Auto_point2 is the
256 full-speed duty-cycle which is hard-
257 wired to 255 (100% duty-cycle).
projects / linux-2.6 / blob