1Kernel driver dme1737 2===================== 3 4Supported chips: 5 * SMSC DME1737 and compatibles (like Asus A8000) 6 Prefix: 'dme1737' 7 Addresses scanned: I2C 0x2c, 0x2d, 0x2e 8 Datasheet: Provided by SMSC upon request and under NDA 9 * SMSC SCH3112, SCH3114, SCH3116 10 Prefix: 'sch311x' 11 Addresses scanned: none, address read from Super-I/O config space 12 Datasheet: Available on the Internet 13 * SMSC SCH5027 14 Prefix: 'sch5027' 15 Addresses scanned: I2C 0x2c, 0x2d, 0x2e 16 Datasheet: Provided by SMSC upon request and under NDA 17 * SMSC SCH5127 18 Prefix: 'sch5127' 19 Addresses scanned: none, address read from Super-I/O config space 20 Datasheet: Provided by SMSC upon request and under NDA 21 22Authors: 23 Juerg Haefliger <juergh@gmail.com> 24 25 26Module Parameters 27----------------- 28 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 32 of this. 33* probe_all_addr: bool Include non-standard LPC addresses 0x162e and 0x164e 34 when probing for ISA devices. This is required for the 35 following boards: 36 - VIA EPIA SN18000 37 38 39Description 40----------- 41 42This driver implements support for the hardware monitoring capabilities of the 43SMSC DME1737 and Asus A8000 (which are the same), SMSC SCH5027, SCH311x, 44and SCH5127 Super-I/O chips. These chips feature monitoring of 3 temp sensors 45temp[1-3] (2 remote diodes and 1 internal), 7 voltages in[0-6] (6 external and 461 internal) and up to 6 fan speeds fan[1-6]. Additionally, the chips implement 47up to 5 PWM outputs pwm[1-3,5-6] for controlling fan speeds both manually and 48automatically. 49 50For the DME1737, A8000 and SCH5027, fan[1-2] and pwm[1-2] are always present. 51Fan[3-6] and pwm[3,5-6] are optional features and their availability depends on 52the configuration of the chip. The driver will detect which features are 53present during initialization and create the sysfs attributes accordingly. 54 55For the SCH311x and SCH5127, fan[1-3] and pwm[1-3] are always present and 56fan[4-6] and pwm[5-6] don't exist. 57 58The hardware monitoring features of the DME1737, A8000, and SCH5027 are only 59accessible via SMBus, while the SCH311x and SCH5127 only provide access via 60the ISA bus. The driver will therefore register itself as an I2C client driver 61if it detects a DME1737, A8000, or SCH5027 and as a platform driver if it 62detects a SCH311x or SCH5127 chip. 63 64 65Voltage Monitoring 66------------------ 67 68The voltage inputs are sampled with 12-bit resolution and have internal 69scaling resistors. The values returned by the driver therefore reflect true 70millivolts and don't need scaling. The voltage inputs are mapped as follows 71(the last column indicates the input ranges): 72 73DME1737, A8000: 74 in0: +5VTR (+5V standby) 0V - 6.64V 75 in1: Vccp (processor core) 0V - 3V 76 in2: VCC (internal +3.3V) 0V - 4.38V 77 in3: +5V 0V - 6.64V 78 in4: +12V 0V - 16V 79 in5: VTR (+3.3V standby) 0V - 4.38V 80 in6: Vbat (+3.0V) 0V - 4.38V 81 82SCH311x: 83 in0: +2.5V 0V - 3.32V 84 in1: Vccp (processor core) 0V - 2V 85 in2: VCC (internal +3.3V) 0V - 4.38V 86 in3: +5V 0V - 6.64V 87 in4: +12V 0V - 16V 88 in5: VTR (+3.3V standby) 0V - 4.38V 89 in6: Vbat (+3.0V) 0V - 4.38V 90 91SCH5027: 92 in0: +5VTR (+5V standby) 0V - 6.64V 93 in1: Vccp (processor core) 0V - 3V 94 in2: VCC (internal +3.3V) 0V - 4.38V 95 in3: V2_IN 0V - 1.5V 96 in4: V1_IN 0V - 1.5V 97 in5: VTR (+3.3V standby) 0V - 4.38V 98 in6: Vbat (+3.0V) 0V - 4.38V 99 100SCH5127: 101 in0: +2.5 0V - 3.32V 102 in1: Vccp (processor core) 0V - 3V 103 in2: VCC (internal +3.3V) 0V - 4.38V 104 in3: V2_IN 0V - 1.5V 105 in4: V1_IN 0V - 1.5V 106 in5: VTR (+3.3V standby) 0V - 4.38V 107 in6: Vbat (+3.0V) 0V - 4.38V 108 109Each voltage input has associated min and max limits which trigger an alarm 110when crossed. 111 112 113Temperature Monitoring 114---------------------- 115 116Temperatures are measured with 12-bit resolution and reported in millidegree 117Celsius. The chip also features offsets for all 3 temperature inputs which - 118when programmed - get added to the input readings. The chip does all the 119scaling by itself and the driver therefore reports true temperatures that don't 120need any user-space adjustments. The temperature inputs are mapped as follows 121(the last column indicates the input ranges): 122 123 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 126 127Each temperature input has associated min and max limits which trigger an alarm 128when crossed. Additionally, each temperature input has a fault attribute that 129returns 1 when a faulty diode or an unconnected input is detected and 0 130otherwise. 131 132 133Fan Monitoring 134-------------- 135 136Fan RPMs are measured with 16-bit resolution. The chip provides inputs for 6 137fan tachometers. All 6 inputs have an associated min limit which triggers an 138alarm when crossed. Fan inputs 1-4 provide type attributes that need to be set 139to the number of pulses per fan revolution that the connected tachometer 140generates. Supported values are 1, 2, and 4. Fan inputs 5-6 only support fans 141that generate 2 pulses per revolution. Fan inputs 5-6 also provide a max 142attribute that needs to be set to the maximum attainable RPM (fan at 100% duty- 143cycle) of the input. The chip adjusts the sampling rate based on this value. 144 145 146PWM Output Control 147------------------ 148 149This chip features 5 PWM outputs. PWM outputs 1-3 are associated with fan 150inputs 1-3 and PWM outputs 5-6 are associated with fan inputs 5-6. PWM outputs 1511-3 can be configured to operate either in manual or automatic mode by setting 152the appropriate enable attribute accordingly. PWM outputs 5-6 can only operate 153in manual mode, their enable attributes are therefore read-only. When set to 154manual mode, the fan speed is set by writing the duty-cycle value to the 155appropriate PWM attribute. In automatic mode, the PWM attribute returns the 156current duty-cycle as set by the fan controller in the chip. All PWM outputs 157support the setting of the output frequency via the freq attribute. 158 159In automatic mode, the chip supports the setting of the PWM ramp rate which 160defines how fast the PWM output is adjusting to changes of the associated 161temperature input. Associating PWM outputs to temperature inputs is done via 162temperature zones. The chip features 3 zones whose assignments to temperature 163inputs is static and determined during initialization. These assignments can 164be retrieved via the zone[1-3]_auto_channels_temp attributes. Each PWM output 165is assigned to one (or hottest of multiple) temperature zone(s) through the 166pwm[1-3]_auto_channels_zone attributes. Each PWM output has 3 distinct output 167duty-cycles: full, low, and min. Full is internally hard-wired to 255 (100%) 168and low and min can be programmed via pwm[1-3]_auto_point1_pwm and 169pwm[1-3]_auto_pwm_min, respectively. The thermal thresholds of the zones are 170programmed via zone[1-3]_auto_point[1-3]_temp and 171zone[1-3]_auto_point1_temp_hyst: 172 173 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 176 177 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 181 182The chip adjusts the output duty-cycle linearly in the range of auto_point1_pwm 183to auto_point2_pwm if the temperature of the associated zone is between 184auto_point1_temp and auto_point2_temp. If the temperature drops below the 185auto_point1_temp_hyst value, the output duty-cycle is set to the auto_pwm_min 186value which only supports two values: 0 or auto_point1_pwm. That means that the 187fan either turns completely off or keeps spinning with the low-speed 188duty-cycle. If any of the temperatures rise above the auto_point3_temp value, 189all PWM outputs are set to 100% duty-cycle. 190 191Following is another representation of how the chip sets the output duty-cycle 192based on the temperature of the associated thermal zone: 193 194 Duty-Cycle Duty-Cycle 195 Temperature Rising Temp Falling Temp 196 ----------- ----------- ------------ 197 full-speed full-speed full-speed 198 199 < linearly adjusted duty-cycle > 200 201 low-speed low-speed low-speed 202 min-speed low-speed 203 min-speed min-speed min-speed 204 min-speed min-speed 205 206 207Sysfs Attributes 208---------------- 209 210Following is a list of all sysfs attributes that the driver provides, their 211permissions and a short description: 212 213Name Perm Description 214---- ---- ----------- 215cpu0_vid RO CPU core reference voltage in 216 millivolts. 217vrm RW Voltage regulator module version 218 number. 219 220in[0-6]_input RO Measured voltage in millivolts. 221in[0-6]_min RW Low limit for voltage input. 222in[0-6]_max RW High limit for voltage input. 223in[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. 226 227temp[1-3]_input RO Measured temperature in millidegree 228 Celsius. 229temp[1-3]_min RW Low limit for temp input. 230temp[1-3]_max RW High limit for temp input. 231temp[1-3]_offset RW Offset for temp input. This value will 232 be added by the chip to the measured 233 temperature. 234temp[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. 237temp[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. 240 241zone[1-3]_auto_channels_temp RO Temperature zone to temperature input 242 mapping. This attribute is a bitfield 243 and supports the following values: 244 1: temp1 245 2: temp2 246 4: temp3 247zone[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 251 value. 252zone[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). 257 258fan[1-6]_input RO Measured fan speed in RPM. 259fan[1-6]_min RW Low limit for fan input. 260fan[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. 263fan[1-4]_type RW Type of attached fan. Expressed in 264 number of pulses per revolution that 265 the fan generates. Supported values are 266 1, 2, and 4. 267fan[5-6]_max RW Max attainable RPM at 100% duty-cycle. 268 Required for chip to adjust the 269 sampling rate accordingly. 270 271pmw[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 274 manual mode. 275pwm[1-3]_enable RW Enable of PWM outputs 1-3. Supported 276 values are: 277 0: turned off (output @ 100%) 278 1: manual mode 279 2: automatic mode 280pwm[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. 283pmw[1-3,5-6]_freq RW Frequency of PWM output. Supported 284 values are in the range 11Hz-30000Hz 285 (default is 25000Hz). 286pmw[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). 293pwm[1-3]_auto_channels_zone RW PWM output to temperature zone mapping. 294 This attribute is a bitfield and 295 supports the following values: 296 1: zone1 297 2: zone2 298 4: zone3 299 6: highest of zone[2-3] 300 7: highest of zone[1-3] 301pwm[1-3]_auto_pwm_min RW Auto PWM min pwm. Minimum PWM duty- 302 cycle. Supported values are 0 or 303 auto_point1_pwm. 304pwm[1-3]_auto_point1_pwm RW Auto PWM pwm point. Auto_point1 is the 305 low-speed duty-cycle. 306pwm[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). 309 310Chip Differences 311---------------- 312 313Feature dme1737 sch311x sch5027 sch5127 314------------------------------------------------------- 315temp[1-3]_offset yes yes 316vid yes 317zone3 yes yes yes 318zone[1-3]_hyst yes yes 319pwm min/off yes yes 320fan3 opt yes opt yes 321pwm3 opt yes opt yes 322fan4 opt opt 323fan5 opt opt 324pwm5 opt opt 325fan6 opt opt 326pwm6 opt opt 327