1Kernel driver dme1737 2===================== 3 4Supported chips: 5 6 * SMSC DME1737 and compatibles (like Asus A8000) 7 8 Prefix: 'dme1737' 9 10 Addresses scanned: I2C 0x2c, 0x2d, 0x2e 11 12 Datasheet: Provided by SMSC upon request and under NDA 13 14 * SMSC SCH3112, SCH3114, SCH3116 15 16 Prefix: 'sch311x' 17 18 Addresses scanned: none, address read from Super-I/O config space 19 20 Datasheet: Available on the Internet 21 22 * SMSC SCH5027 23 24 Prefix: 'sch5027' 25 26 Addresses scanned: I2C 0x2c, 0x2d, 0x2e 27 28 Datasheet: Provided by SMSC upon request and under NDA 29 30 * SMSC SCH5127 31 32 Prefix: 'sch5127' 33 34 Addresses scanned: none, address read from Super-I/O config space 35 36 Datasheet: Provided by SMSC upon request and under NDA 37 38Authors: 39 Juerg Haefliger <juergh@gmail.com> 40 41 42Module Parameters 43----------------- 44 45* force_start: bool 46 Enables the monitoring of voltage, fan and temp inputs 47 and PWM output control functions. Using this parameter 48 shouldn't be required since the BIOS usually takes care 49 of this. 50 51* probe_all_addr: bool 52 Include non-standard LPC addresses 0x162e and 0x164e 53 when probing for ISA devices. This is required for the 54 following boards: 55 - VIA EPIA SN18000 56 57 58Description 59----------- 60 61This driver implements support for the hardware monitoring capabilities of the 62SMSC DME1737 and Asus A8000 (which are the same), SMSC SCH5027, SCH311x, 63and SCH5127 Super-I/O chips. These chips feature monitoring of 3 temp sensors 64temp[1-3] (2 remote diodes and 1 internal), 8 voltages in[0-7] (7 external and 651 internal) and up to 6 fan speeds fan[1-6]. Additionally, the chips implement 66up to 5 PWM outputs pwm[1-3,5-6] for controlling fan speeds both manually and 67automatically. 68 69For the DME1737, A8000 and SCH5027, fan[1-2] and pwm[1-2] are always present. 70Fan[3-6] and pwm[3,5-6] are optional features and their availability depends on 71the configuration of the chip. The driver will detect which features are 72present during initialization and create the sysfs attributes accordingly. 73 74For the SCH311x and SCH5127, fan[1-3] and pwm[1-3] are always present and 75fan[4-6] and pwm[5-6] don't exist. 76 77The hardware monitoring features of the DME1737, A8000, and SCH5027 are only 78accessible via SMBus, while the SCH311x and SCH5127 only provide access via 79the ISA bus. The driver will therefore register itself as an I2C client driver 80if it detects a DME1737, A8000, or SCH5027 and as a platform driver if it 81detects a SCH311x or SCH5127 chip. 82 83 84Voltage Monitoring 85------------------ 86 87The voltage inputs are sampled with 12-bit resolution and have internal 88scaling resistors. The values returned by the driver therefore reflect true 89millivolts and don't need scaling. The voltage inputs are mapped as follows 90(the last column indicates the input ranges): 91 92DME1737, A8000:: 93 94 in0: +5VTR (+5V standby) 0V - 6.64V 95 in1: Vccp (processor core) 0V - 3V 96 in2: VCC (internal +3.3V) 0V - 4.38V 97 in3: +5V 0V - 6.64V 98 in4: +12V 0V - 16V 99 in5: VTR (+3.3V standby) 0V - 4.38V 100 in6: Vbat (+3.0V) 0V - 4.38V 101 102SCH311x:: 103 104 in0: +2.5V 0V - 3.32V 105 in1: Vccp (processor core) 0V - 2V 106 in2: VCC (internal +3.3V) 0V - 4.38V 107 in3: +5V 0V - 6.64V 108 in4: +12V 0V - 16V 109 in5: VTR (+3.3V standby) 0V - 4.38V 110 in6: Vbat (+3.0V) 0V - 4.38V 111 112SCH5027:: 113 114 in0: +5VTR (+5V standby) 0V - 6.64V 115 in1: Vccp (processor core) 0V - 3V 116 in2: VCC (internal +3.3V) 0V - 4.38V 117 in3: V2_IN 0V - 1.5V 118 in4: V1_IN 0V - 1.5V 119 in5: VTR (+3.3V standby) 0V - 4.38V 120 in6: Vbat (+3.0V) 0V - 4.38V 121 122SCH5127:: 123 124 in0: +2.5 0V - 3.32V 125 in1: Vccp (processor core) 0V - 3V 126 in2: VCC (internal +3.3V) 0V - 4.38V 127 in3: V2_IN 0V - 1.5V 128 in4: V1_IN 0V - 1.5V 129 in5: VTR (+3.3V standby) 0V - 4.38V 130 in6: Vbat (+3.0V) 0V - 4.38V 131 in7: Vtrip (+1.5V) 0V - 1.99V 132 133Each voltage input has associated min and max limits which trigger an alarm 134when crossed. 135 136 137Temperature Monitoring 138---------------------- 139 140Temperatures are measured with 12-bit resolution and reported in millidegree 141Celsius. The chip also features offsets for all 3 temperature inputs which - 142when programmed - get added to the input readings. The chip does all the 143scaling by itself and the driver therefore reports true temperatures that don't 144need any user-space adjustments. The temperature inputs are mapped as follows 145(the last column indicates the input ranges):: 146 147 temp1: Remote diode 1 (3904 type) temperature -127C - +127C 148 temp2: DME1737 internal temperature -127C - +127C 149 temp3: Remote diode 2 (3904 type) temperature -127C - +127C 150 151Each temperature input has associated min and max limits which trigger an alarm 152when crossed. Additionally, each temperature input has a fault attribute that 153returns 1 when a faulty diode or an unconnected input is detected and 0 154otherwise. 155 156 157Fan Monitoring 158-------------- 159 160Fan RPMs are measured with 16-bit resolution. The chip provides inputs for 6 161fan tachometers. All 6 inputs have an associated min limit which triggers an 162alarm when crossed. Fan inputs 1-4 provide type attributes that need to be set 163to the number of pulses per fan revolution that the connected tachometer 164generates. Supported values are 1, 2, and 4. Fan inputs 5-6 only support fans 165that generate 2 pulses per revolution. Fan inputs 5-6 also provide a max 166attribute that needs to be set to the maximum attainable RPM (fan at 100% duty- 167cycle) of the input. The chip adjusts the sampling rate based on this value. 168 169 170PWM Output Control 171------------------ 172 173This chip features 5 PWM outputs. PWM outputs 1-3 are associated with fan 174inputs 1-3 and PWM outputs 5-6 are associated with fan inputs 5-6. PWM outputs 1751-3 can be configured to operate either in manual or automatic mode by setting 176the appropriate enable attribute accordingly. PWM outputs 5-6 can only operate 177in manual mode, their enable attributes are therefore read-only. When set to 178manual mode, the fan speed is set by writing the duty-cycle value to the 179appropriate PWM attribute. In automatic mode, the PWM attribute returns the 180current duty-cycle as set by the fan controller in the chip. All PWM outputs 181support the setting of the output frequency via the freq attribute. 182 183In automatic mode, the chip supports the setting of the PWM ramp rate which 184defines how fast the PWM output is adjusting to changes of the associated 185temperature input. Associating PWM outputs to temperature inputs is done via 186temperature zones. The chip features 3 zones whose assignments to temperature 187inputs is static and determined during initialization. These assignments can 188be retrieved via the zone[1-3]_auto_channels_temp attributes. Each PWM output 189is assigned to one (or hottest of multiple) temperature zone(s) through the 190pwm[1-3]_auto_channels_zone attributes. Each PWM output has 3 distinct output 191duty-cycles: full, low, and min. Full is internally hard-wired to 255 (100%) 192and low and min can be programmed via pwm[1-3]_auto_point1_pwm and 193pwm[1-3]_auto_pwm_min, respectively. The thermal thresholds of the zones are 194programmed via zone[1-3]_auto_point[1-3]_temp and 195zone[1-3]_auto_point1_temp_hyst: 196 197 =============================== ======================================= 198 pwm[1-3]_auto_point2_pwm full-speed duty-cycle (255, i.e., 100%) 199 pwm[1-3]_auto_point1_pwm low-speed duty-cycle 200 pwm[1-3]_auto_pwm_min min-speed duty-cycle 201 202 zone[1-3]_auto_point3_temp full-speed temp (all outputs) 203 zone[1-3]_auto_point2_temp full-speed temp 204 zone[1-3]_auto_point1_temp low-speed temp 205 zone[1-3]_auto_point1_temp_hyst min-speed temp 206 =============================== ======================================= 207 208The chip adjusts the output duty-cycle linearly in the range of auto_point1_pwm 209to auto_point2_pwm if the temperature of the associated zone is between 210auto_point1_temp and auto_point2_temp. If the temperature drops below the 211auto_point1_temp_hyst value, the output duty-cycle is set to the auto_pwm_min 212value which only supports two values: 0 or auto_point1_pwm. That means that the 213fan either turns completely off or keeps spinning with the low-speed 214duty-cycle. If any of the temperatures rise above the auto_point3_temp value, 215all PWM outputs are set to 100% duty-cycle. 216 217Following is another representation of how the chip sets the output duty-cycle 218based on the temperature of the associated thermal zone: 219 220 =============== =============== ================= 221 Temperature Duty-Cycle Duty-Cycle 222 Rising Temp Falling Temp 223 =============== =============== ================= 224 full-speed full-speed full-speed 225 226 - < linearly - 227 adjusted 228 duty-cycle > 229 230 low-speed low-speed low-speed 231 - min-speed low-speed 232 min-speed min-speed min-speed 233 - min-speed min-speed 234 =============== =============== ================= 235 236 237Sysfs Attributes 238---------------- 239 240Following is a list of all sysfs attributes that the driver provides, their 241permissions and a short description: 242 243=============================== ======= ======================================= 244Name Perm Description 245=============================== ======= ======================================= 246cpu0_vid RO CPU core reference voltage in 247 millivolts. 248vrm RW Voltage regulator module version 249 number. 250 251in[0-7]_input RO Measured voltage in millivolts. 252in[0-7]_min RW Low limit for voltage input. 253in[0-7]_max RW High limit for voltage input. 254in[0-7]_alarm RO Voltage input alarm. Returns 1 if 255 voltage input is or went outside the 256 associated min-max range, 0 otherwise. 257 258temp[1-3]_input RO Measured temperature in millidegree 259 Celsius. 260temp[1-3]_min RW Low limit for temp input. 261temp[1-3]_max RW High limit for temp input. 262temp[1-3]_offset RW Offset for temp input. This value will 263 be added by the chip to the measured 264 temperature. 265temp[1-3]_alarm RO Alarm for temp input. Returns 1 if temp 266 input is or went outside the associated 267 min-max range, 0 otherwise. 268temp[1-3]_fault RO Temp input fault. Returns 1 if the chip 269 detects a faulty thermal diode or an 270 unconnected temp input, 0 otherwise. 271 272zone[1-3]_auto_channels_temp RO Temperature zone to temperature input 273 mapping. This attribute is a bitfield 274 and supports the following values: 275 276 - 1: temp1 277 - 2: temp2 278 - 4: temp3 279zone[1-3]_auto_point1_temp_hyst RW Auto PWM temp point1 hysteresis. The 280 output of the corresponding PWM is set 281 to the pwm_auto_min value if the temp 282 falls below the auto_point1_temp_hyst 283 value. 284zone[1-3]_auto_point[1-3]_temp RW Auto PWM temp points. Auto_point1 is 285 the low-speed temp, auto_point2 is the 286 full-speed temp, and auto_point3 is the 287 temp at which all PWM outputs are set 288 to full-speed (100% duty-cycle). 289 290fan[1-6]_input RO Measured fan speed in RPM. 291fan[1-6]_min RW Low limit for fan input. 292fan[1-6]_alarm RO Alarm for fan input. Returns 1 if fan 293 input is or went below the associated 294 min value, 0 otherwise. 295fan[1-4]_type RW Type of attached fan. Expressed in 296 number of pulses per revolution that 297 the fan generates. Supported values are 298 1, 2, and 4. 299fan[5-6]_max RW Max attainable RPM at 100% duty-cycle. 300 Required for chip to adjust the 301 sampling rate accordingly. 302 303pmw[1-3,5-6] RO/RW Duty-cycle of PWM output. Supported 304 values are 0-255 (0%-100%). Only 305 writeable if the associated PWM is in 306 manual mode. 307pwm[1-3]_enable RW Enable of PWM outputs 1-3. Supported 308 values are: 309 310 - 0: turned off (output @ 100%) 311 - 1: manual mode 312 - 2: automatic mode 313pwm[5-6]_enable RO Enable of PWM outputs 5-6. Always 314 returns 1 since these 2 outputs are 315 hard-wired to manual mode. 316pmw[1-3,5-6]_freq RW Frequency of PWM output. Supported 317 values are in the range 11Hz-30000Hz 318 (default is 25000Hz). 319pmw[1-3]_ramp_rate RW Ramp rate of PWM output. Determines how 320 fast the PWM duty-cycle will change 321 when the PWM is in automatic mode. 322 Expressed in ms per PWM step. Supported 323 values are in the range 0ms-206ms 324 (default is 0, which means the duty- 325 cycle changes instantly). 326pwm[1-3]_auto_channels_zone RW PWM output to temperature zone mapping. 327 This attribute is a bitfield and 328 supports the following values: 329 330 - 1: zone1 331 - 2: zone2 332 - 4: zone3 333 - 6: highest of zone[2-3] 334 - 7: highest of zone[1-3] 335pwm[1-3]_auto_pwm_min RW Auto PWM min pwm. Minimum PWM duty- 336 cycle. Supported values are 0 or 337 auto_point1_pwm. 338pwm[1-3]_auto_point1_pwm RW Auto PWM pwm point. Auto_point1 is the 339 low-speed duty-cycle. 340pwm[1-3]_auto_point2_pwm RO Auto PWM pwm point. Auto_point2 is the 341 full-speed duty-cycle which is hard- 342 wired to 255 (100% duty-cycle). 343=============================== ======= ======================================= 344 345Chip Differences 346---------------- 347 348======================= ======= ======= ======= ======= 349Feature dme1737 sch311x sch5027 sch5127 350======================= ======= ======= ======= ======= 351temp[1-3]_offset yes yes 352vid yes 353zone3 yes yes yes 354zone[1-3]_hyst yes yes 355pwm min/off yes yes 356fan3 opt yes opt yes 357pwm3 opt yes opt yes 358fan4 opt opt 359fan5 opt opt 360pwm5 opt opt 361fan6 opt opt 362pwm6 opt opt 363in7 yes 364======================= ======= ======= ======= ======= 365