Kernel driver `lm90.o' ===================== Status: Complete and reasonably tested Supported chips: * National Semiconductor LM90 Prefix: `lm90' Addresses scanned: I2C 0x4c Datasheet: Publicly available at the National Semiconductor website http://www.national.com/pf/LM/LM90.html * Analog Devices ADM1032 Prefix: `adm1032' Addresses scanned: I2C 0x4c Datasheet: Publicly available at the Analog Devices website http://products.analog.com/products/info.asp?product=ADM1032 Author: Jean Delvare License: GPL Module Parameters ----------------- * force: short array (min = 1, max = 48) List of adapter,address pairs to boldly assume to be present * force_lm90: short array (min = 1, max = 48) List of adapter,address pairs which are unquestionably assumed to contain a `lm90' chip * force_adm1032: short array (min = 1, max = 48) List of adapter,address pairs which are unquestionably assumed to contain a `adm1032' chip * probe: short array (min = 1, max = 48) List of adapter,address pairs to scan additionally * probe_range: short array (min = 1, max = 48) List of adapter,start-addr,end-addr triples to scan additionally * ignore: short array (min = 1, max = 48) List of adapter,address pairs not to scan * ignore_range: short array (min = 1, max = 48) List of adapter,start-addr,end-addr triples not to scan Description ----------- The LM90 is a digital temperature sensor. It senses its own temperature as well as the temperature of up to one external diode. It is compatible with many other devices such as the LM86, the LM89, the ADM1032, the MAX6657 and the MAX6658. Of these, only the ADM1032 is officially supported for now, but the others can probably be successfully forced. The specificity of this family of chipsets over the ADM1021/LM84 family is that it features critical limits with hysteresis, and an increased resolution of the remote temperature measurement. The different chipsets of the family are not stricly identical, although very similar. This driver doesn't handle any specific feature for now, but could if there ever was a need for it. For reference, here comes a non-exhaustive list of specific features: LM90: * Filter and alert configuration register at 0xBF. * ALERT is triggered by temperatures over critical limits. ADM1032: * Consecutive alert register at 0x22. * Conversion averaging. * Up to 64 conversions/s. * ALERT is triggered by open remote sensor. All temperature values are given in degrees Celcius. Resolution is 1.0 degree for the local temperature, 0.125 degree for the remote temperature. According to the datasheets, the ADM1032 has a better range and accuracy than the LM90 (but is also way more expensive). See the datasheets for details. Each sensor has its own high and low limits, plus a critical limit. Additionally, there is a relative hysteresis value common to both critical values. To make life easier to user-space applications, two absolute values are exported, one for each channel, but these values are of course linked. Only the local hysteresis can be set from user-space, and the same delta applies to the remote hysteresis. The lm90 driver will not update its values more frequently than every other second; reading them more often will do no harm, but will return 'old' values. Chip Features ------------- Chip 'lm90' LABEL LABEL CLASS COMPUTE CLASS MODE MAGN temp1 - - R- 0 temp1_high temp1 temp1 RW 0 temp1_low temp1 temp1 RW 0 temp2 - - R- 1 temp2_high temp2 temp2 RW 1 temp2_low temp2 temp2 RW 1 tcrit1 temp1 temp1 RW 0 tcrit2 temp2 temp2 RW 0 hyst1 tcrit1 tcrit1 RW 0 hyst2 tcrit2 tcrit2 R- 0 alarms - - R- 0 LABEL FEATURE SYMBOL SYSCTL FILE:N temp1 SENSORS_LM90_LOCAL_TEMP temp1:3 temp1_high SENSORS_LM90_LOCAL_HIGH temp1:1 temp1_low SENSORS_LM90_LOCAL_LOW temp1:2 temp2 SENSORS_LM90_REMOTE_TEMP temp2:3 temp2_high SENSORS_LM90_REMOTE_HIGH temp2:1 temp2_low SENSORS_LM90_REMOTE_LOW temp2:2 tcrit1 SENSORS_LM90_LOCAL_TCRIT tcrit1:1 tcrit2 SENSORS_LM90_REMOTE_TCRIT tcrit2:1 hyst1 SENSORS_LM90_LOCAL_TCRIT_HYST hyst1:1 hyst2 SENSORS_LM90_REMOTE_TCRIT_HYST hyst2:1 alarms SENSORS_LM90_ALARMS alarms:1 Chip 'adm1032' LABEL LABEL CLASS COMPUTE CLASS MODE MAGN temp1 - - R- 0 temp1_high temp1 temp1 RW 0 temp1_low temp1 temp1 RW 0 temp2 - - R- 1 temp2_high temp2 temp2 RW 1 temp2_low temp2 temp2 RW 1 tcrit1 temp1 temp1 RW 0 tcrit2 temp2 temp2 RW 0 hyst1 tcrit1 tcrit1 RW 0 hyst2 tcrit2 tcrit2 R- 0 alarms - - R- 0 LABEL FEATURE SYMBOL SYSCTL FILE:N temp1 SENSORS_LM90_LOCAL_TEMP temp1:3 temp1_high SENSORS_LM90_LOCAL_HIGH temp1:1 temp1_low SENSORS_LM90_LOCAL_LOW temp1:2 temp2 SENSORS_LM90_REMOTE_TEMP temp2:3 temp2_high SENSORS_LM90_REMOTE_HIGH temp2:1 temp2_low SENSORS_LM90_REMOTE_LOW temp2:2 tcrit1 SENSORS_LM90_LOCAL_TCRIT tcrit1:1 tcrit2 SENSORS_LM90_REMOTE_TCRIT tcrit2:1 hyst1 SENSORS_LM90_LOCAL_TCRIT_HYST hyst1:1 hyst2 SENSORS_LM90_REMOTE_TCRIT_HYST hyst2:1 alarms SENSORS_LM90_ALARMS alarms:1