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Diffstat (limited to 'Documentation/hwmon/lm90')
| -rw-r--r-- | Documentation/hwmon/lm90 | 153 |
1 files changed, 126 insertions, 27 deletions
diff --git a/Documentation/hwmon/lm90 b/Documentation/hwmon/lm90 index aa4a0ec2008..8122675d30f 100644 --- a/Documentation/hwmon/lm90 +++ b/Documentation/hwmon/lm90 @@ -8,10 +8,10 @@ Supported chips: Datasheet: Publicly available at the National Semiconductor website http://www.national.com/pf/LM/LM90.html * National Semiconductor LM89 - Prefix: 'lm99' + Prefix: 'lm89' (no auto-detection) Addresses scanned: I2C 0x4c and 0x4d Datasheet: Publicly available at the National Semiconductor website - http://www.national.com/pf/LM/LM89.html + http://www.national.com/mpf/LM/LM89.html * National Semiconductor LM99 Prefix: 'lm99' Addresses scanned: I2C 0x4c and 0x4d @@ -21,18 +21,47 @@ Supported chips: Prefix: 'lm86' Addresses scanned: I2C 0x4c Datasheet: Publicly available at the National Semiconductor website - http://www.national.com/pf/LM/LM86.html + http://www.national.com/mpf/LM/LM86.html * Analog Devices ADM1032 Prefix: 'adm1032' Addresses scanned: I2C 0x4c and 0x4d - Datasheet: Publicly available at the Analog Devices website - http://www.analog.com/en/prod/0,2877,ADM1032,00.html + Datasheet: Publicly available at the ON Semiconductor website + http://www.onsemi.com/PowerSolutions/product.do?id=ADM1032 * Analog Devices ADT7461 Prefix: 'adt7461' Addresses scanned: I2C 0x4c and 0x4d - Datasheet: Publicly available at the Analog Devices website - http://www.analog.com/en/prod/0,2877,ADT7461,00.html - Note: Only if in ADM1032 compatibility mode + Datasheet: Publicly available at the ON Semiconductor website + http://www.onsemi.com/PowerSolutions/product.do?id=ADT7461 + * Analog Devices ADT7461A + Prefix: 'adt7461a' + Addresses scanned: I2C 0x4c and 0x4d + Datasheet: Publicly available at the ON Semiconductor website + http://www.onsemi.com/PowerSolutions/product.do?id=ADT7461A + * ON Semiconductor NCT1008 + Prefix: 'nct1008' + Addresses scanned: I2C 0x4c and 0x4d + Datasheet: Publicly available at the ON Semiconductor website + http://www.onsemi.com/PowerSolutions/product.do?id=NCT1008 + * Maxim MAX6646 + Prefix: 'max6646' + Addresses scanned: I2C 0x4d + Datasheet: Publicly available at the Maxim website + http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3497 + * Maxim MAX6647 + Prefix: 'max6646' + Addresses scanned: I2C 0x4e + Datasheet: Publicly available at the Maxim website + http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3497 + * Maxim MAX6648 + Prefix: 'max6646' + Addresses scanned: I2C 0x4c + Datasheet: Publicly available at the Maxim website + http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3500 + * Maxim MAX6649 + Prefix: 'max6646' + Addresses scanned: I2C 0x4c + Datasheet: Publicly available at the Maxim website + http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3497 * Maxim MAX6657 Prefix: 'max6657' Addresses scanned: I2C 0x4c @@ -44,8 +73,8 @@ Supported chips: Datasheet: Publicly available at the Maxim website http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578 * Maxim MAX6659 - Prefix: 'max6657' - Addresses scanned: I2C 0x4c, 0x4d (unsupported 0x4e) + Prefix: 'max6659' + Addresses scanned: I2C 0x4c, 0x4d, 0x4e Datasheet: Publicly available at the Maxim website http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578 * Maxim MAX6680 @@ -60,9 +89,47 @@ Supported chips: 0x4c, 0x4d and 0x4e Datasheet: Publicly available at the Maxim website http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3370 + * Maxim MAX6692 + Prefix: 'max6646' + Addresses scanned: I2C 0x4c + Datasheet: Publicly available at the Maxim website + http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3500 + * Maxim MAX6695 + Prefix: 'max6695' + Addresses scanned: I2C 0x18 + Datasheet: Publicly available at the Maxim website + http://www.maxim-ic.com/datasheet/index.mvp/id/4199 + * Maxim MAX6696 + Prefix: 'max6695' + Addresses scanned: I2C 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, + 0x4c, 0x4d and 0x4e + Datasheet: Publicly available at the Maxim website + http://www.maxim-ic.com/datasheet/index.mvp/id/4199 + * Winbond/Nuvoton W83L771W/G + Prefix: 'w83l771' + Addresses scanned: I2C 0x4c + Datasheet: No longer available + * Winbond/Nuvoton W83L771AWG/ASG + Prefix: 'w83l771' + Addresses scanned: I2C 0x4c + Datasheet: Not publicly available, can be requested from Nuvoton + * Philips/NXP SA56004X + Prefix: 'sa56004' + Addresses scanned: I2C 0x48 through 0x4F + Datasheet: Publicly available at NXP website + http://ics.nxp.com/products/interface/datasheet/sa56004x.pdf + * GMT G781 + Prefix: 'g781' + Addresses scanned: I2C 0x4c, 0x4d + Datasheet: Not publicly available from GMT + * Texas Instruments TMP451 + Prefix: 'tmp451' + Addresses scanned: I2C 0x4c + Datasheet: Publicly available at TI website + http://www.ti.com/litv/pdf/sbos686 -Author: Jean Delvare <khali@linux-fr.org> +Author: Jean Delvare <jdelvare@suse.de> Description @@ -70,25 +137,22 @@ 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 LM99, the ADM1032, -the MAX6657, MAX6658, MAX6659, MAX6680 and the MAX6681 all of which are -supported by this driver. +with many other devices, many of which are supported by this driver. Note that there is no easy way to differentiate between the MAX6657, -MAX6658 and MAX6659 variants. The extra address and features of the -MAX6659 are not supported by this driver. The MAX6680 and MAX6681 only -differ in their pinout, therefore they obviously can't (and don't need to) -be distinguished. Additionally, the ADT7461 is supported if found in -ADM1032 compatibility mode. +MAX6658 and MAX6659 variants. The extra features of the MAX6659 are only +supported by this driver if the chip is located at address 0x4d or 0x4e, +or if the chip type is explicitly selected as max6659. +The MAX6680 and MAX6681 only differ in their pinout, therefore they obviously +can't (and don't need to) be distinguished. 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 strictly identical, although -very similar. This driver doesn't handle any specific feature for now, -with the exception of SMBus PEC. For reference, here comes a non-exhaustive -list of specific features: +very similar. For reference, here comes a non-exhaustive list of specific +features: LM90: * Filter and alert configuration register at 0xBF. @@ -109,14 +173,16 @@ ADM1032: * ALERT is triggered by open remote sensor. * SMBus PEC support for Write Byte and Receive Byte transactions. -ADT7461: +ADT7461, ADT7461A, NCT1008: * Extended temperature range (breaks compatibility) * Lower resolution for remote temperature MAX6657 and MAX6658: + * Better local resolution * Remote sensor type selection MAX6659: + * Better local resolution * Selectable address * Second critical temperature limit * Remote sensor type selection @@ -125,9 +191,29 @@ MAX6680 and MAX6681: * Selectable address * Remote sensor type selection +MAX6695 and MAX6696: + * Better local resolution + * Selectable address (max6696) + * Second critical temperature limit + * Two remote sensors + +W83L771W/G + * The G variant is lead-free, otherwise similar to the W. + * Filter and alert configuration register at 0xBF + * Moving average (depending on conversion rate) + +W83L771AWG/ASG + * Successor of the W83L771W/G, same features. + * The AWG and ASG variants only differ in package format. + * Diode ideality factor configuration (remote sensor) at 0xE3 + +SA56004X: + * Better local resolution + All temperature values are given in degrees Celsius. Resolution is 1.0 degree for the local temperature, 0.125 degree for the remote -temperature. +temperature, except for the MAX6657, MAX6658 and MAX6659 which have a +resolution of 0.125 degree for both temperatures. Each sensor has its own high and low limits, plus a critical limit. Additionally, there is a relative hysteresis value common to both critical @@ -136,9 +222,22 @@ 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. +The lm90 driver will not update its values more frequently than configured with +the update_interval attribute; reading them more often will do no harm, but will +return 'old' values. + +SMBus Alert Support +------------------- + +This driver has basic support for SMBus alert. When an alert is received, +the status register is read and the faulty temperature channel is logged. + +The Analog Devices chips (ADM1032, ADT7461 and ADT7461A) and ON +Semiconductor chips (NCT1008) do not implement the SMBus alert protocol +properly so additional care is needed: the ALERT output is disabled when +an alert is received, and is re-enabled only when the alarm is gone. +Otherwise the chip would block alerts from other chips in the bus as long +as the alarm is active. PEC Support ----------- |