Commit | Line | Data |
---|---|---|
4453d736 GR |
1 | Kernel driver jc42 |
2 | ================== | |
3 | ||
4 | Supported chips: | |
b32570a4 | 5 | |
4453d736 | 6 | * Analog Devices ADT7408 |
b32570a4 | 7 | |
4453d736 | 8 | Datasheets: |
b32570a4 | 9 | |
d38b7e4a | 10 | https://www.analog.com/static/imported-files/data_sheets/ADT7408.pdf |
b32570a4 | 11 | |
175c490c | 12 | * Atmel AT30TS00, AT30TS002A/B, AT30TSE004A |
b32570a4 | 13 | |
4453d736 | 14 | Datasheets: |
b32570a4 | 15 | |
1bd612a2 | 16 | http://www.atmel.com/Images/doc8585.pdf |
b32570a4 | 17 | |
175c490c | 18 | http://www.atmel.com/Images/doc8711.pdf |
b32570a4 | 19 | |
175c490c | 20 | http://www.atmel.com/Images/Atmel-8852-SEEPROM-AT30TSE002A-Datasheet.pdf |
b32570a4 | 21 | |
175c490c | 22 | http://www.atmel.com/Images/Atmel-8868-DTS-AT30TSE004A-Datasheet.pdf |
b32570a4 | 23 | |
0ea2f1db | 24 | * IDT TSE2002B3, TSE2002GB2, TSE2004GB2, TS3000B3, TS3000GB0, TS3000GB2, |
b32570a4 | 25 | |
0ea2f1db | 26 | TS3001GB2 |
b32570a4 | 27 | |
1bd612a2 | 28 | Datasheets: |
b32570a4 | 29 | |
0ea2f1db | 30 | Available from IDT web site |
b32570a4 | 31 | |
4453d736 | 32 | * Maxim MAX6604 |
b32570a4 | 33 | |
4453d736 | 34 | Datasheets: |
b32570a4 | 35 | |
4453d736 | 36 | http://datasheets.maxim-ic.com/en/ds/MAX6604.pdf |
b32570a4 | 37 | |
a31887dc | 38 | * Microchip MCP9804, MCP9805, MCP9808, MCP98242, MCP98243, MCP98244, MCP9843 |
b32570a4 | 39 | |
4453d736 | 40 | Datasheets: |
b32570a4 | 41 | |
d38b7e4a | 42 | https://ww1.microchip.com/downloads/en/DeviceDoc/22203C.pdf |
b32570a4 | 43 | |
d38b7e4a | 44 | https://ww1.microchip.com/downloads/en/DeviceDoc/21977b.pdf |
b32570a4 | 45 | |
d38b7e4a | 46 | https://ww1.microchip.com/downloads/en/DeviceDoc/25095A.pdf |
b32570a4 | 47 | |
d38b7e4a | 48 | https://ww1.microchip.com/downloads/en/DeviceDoc/21996a.pdf |
b32570a4 | 49 | |
d38b7e4a | 50 | https://ww1.microchip.com/downloads/en/DeviceDoc/22153c.pdf |
b32570a4 | 51 | |
d38b7e4a | 52 | https://ww1.microchip.com/downloads/en/DeviceDoc/22327A.pdf |
b32570a4 | 53 | |
86dda176 | 54 | * NXP Semiconductors SE97, SE97B, SE98, SE98A |
b32570a4 | 55 | |
4453d736 | 56 | Datasheets: |
b32570a4 | 57 | |
d38b7e4a | 58 | https://www.nxp.com/documents/data_sheet/SE97.pdf |
b32570a4 | 59 | |
d38b7e4a | 60 | https://www.nxp.com/documents/data_sheet/SE97B.pdf |
b32570a4 | 61 | |
d38b7e4a | 62 | https://www.nxp.com/documents/data_sheet/SE98.pdf |
b32570a4 | 63 | |
d38b7e4a | 64 | https://www.nxp.com/documents/data_sheet/SE98A.pdf |
b32570a4 | 65 | |
4453d736 | 66 | * ON Semiconductor CAT34TS02, CAT6095 |
b32570a4 | 67 | |
4453d736 | 68 | Datasheet: |
b32570a4 | 69 | |
d38b7e4a | 70 | https://www.onsemi.com/pub_link/Collateral/CAT34TS02-D.PDF |
b32570a4 | 71 | |
d38b7e4a | 72 | https://www.onsemi.com/pub/Collateral/CAT6095-D.PDF |
b32570a4 | 73 | |
175c490c | 74 | * ST Microelectronics STTS424, STTS424E02, STTS2002, STTS2004, STTS3000 |
b32570a4 | 75 | |
4de86126 | 76 | Datasheets: |
b32570a4 | 77 | |
175c490c | 78 | http://www.st.com/web/en/resource/technical/document/datasheet/CD00157556.pdf |
b32570a4 | 79 | |
175c490c | 80 | http://www.st.com/web/en/resource/technical/document/datasheet/CD00157558.pdf |
b32570a4 | 81 | |
175c490c | 82 | http://www.st.com/web/en/resource/technical/document/datasheet/CD00266638.pdf |
b32570a4 | 83 | |
175c490c | 84 | http://www.st.com/web/en/resource/technical/document/datasheet/CD00225278.pdf |
b32570a4 | 85 | |
175c490c | 86 | http://www.st.com/web/en/resource/technical/document/datasheet/DM00076709.pdf |
b32570a4 | 87 | |
4453d736 | 88 | * JEDEC JC 42.4 compliant temperature sensor chips |
b32570a4 | 89 | |
d5622f5b | 90 | Datasheet: |
b32570a4 | 91 | |
d5622f5b | 92 | http://www.jedec.org/sites/default/files/docs/4_01_04R19.pdf |
4453d736 | 93 | |
b32570a4 | 94 | |
86dda176 | 95 | Common for all chips: |
b32570a4 | 96 | |
86dda176 | 97 | Prefix: 'jc42' |
b32570a4 | 98 | |
86dda176 GR |
99 | Addresses scanned: I2C 0x18 - 0x1f |
100 | ||
4453d736 | 101 | Author: |
e3333e57 | 102 | Guenter Roeck <linux@roeck-us.net> |
4453d736 GR |
103 | |
104 | ||
105 | Description | |
106 | ----------- | |
107 | ||
d5622f5b CL |
108 | This driver implements support for JEDEC JC 42.4 compliant temperature sensors, |
109 | which are used on many DDR3 memory modules for mobile devices and servers. Some | |
110 | systems use the sensor to prevent memory overheating by automatically throttling | |
111 | the memory controller. | |
112 | ||
4453d736 GR |
113 | The driver auto-detects the chips listed above, but can be manually instantiated |
114 | to support other JC 42.4 compliant chips. | |
115 | ||
116 | Example: the following will load the driver for a generic JC 42.4 compliant | |
b32570a4 | 117 | temperature sensor at address 0x18 on I2C bus #1:: |
4453d736 | 118 | |
b32570a4 MCC |
119 | # modprobe jc42 |
120 | # echo jc42 0x18 > /sys/bus/i2c/devices/i2c-1/new_device | |
4453d736 GR |
121 | |
122 | A JC 42.4 compliant chip supports a single temperature sensor. Minimum, maximum, | |
123 | and critical temperature can be configured. There are alarms for high, low, | |
124 | and critical thresholds. | |
125 | ||
126 | There is also an hysteresis to control the thresholds for resetting alarms. | |
127 | Per JC 42.4 specification, the hysteresis threshold can be configured to 0, 1.5, | |
128 | 3.0, and 6.0 degrees C. Configured hysteresis values will be rounded to those | |
129 | limits. The chip supports only a single register to configure the hysteresis, | |
130 | which applies to all limits. This register can be written by writing into | |
131 | temp1_crit_hyst. Other hysteresis attributes are read-only. | |
132 | ||
2c6315da CL |
133 | If the BIOS has configured the sensor for automatic temperature management, it |
134 | is likely that it has locked the registers, i.e., that the temperature limits | |
135 | cannot be changed. | |
136 | ||
4453d736 GR |
137 | Sysfs entries |
138 | ------------- | |
139 | ||
b32570a4 | 140 | ======================= =========================================== |
4453d736 | 141 | temp1_input Temperature (RO) |
2c6315da CL |
142 | temp1_min Minimum temperature (RO or RW) |
143 | temp1_max Maximum temperature (RO or RW) | |
144 | temp1_crit Critical high temperature (RO or RW) | |
4453d736 | 145 | |
2c6315da | 146 | temp1_crit_hyst Critical hysteresis temperature (RO or RW) |
4453d736 GR |
147 | temp1_max_hyst Maximum hysteresis temperature (RO) |
148 | ||
149 | temp1_min_alarm Temperature low alarm | |
150 | temp1_max_alarm Temperature high alarm | |
151 | temp1_crit_alarm Temperature critical alarm | |
b32570a4 | 152 | ======================= =========================================== |