diff options
Diffstat (limited to 'Documentation/hwmon/jc42')
-rw-r--r-- | Documentation/hwmon/jc42 | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/Documentation/hwmon/jc42 b/Documentation/hwmon/jc42 new file mode 100644 index 000000000000..0e76ef12e4c6 --- /dev/null +++ b/Documentation/hwmon/jc42 | |||
@@ -0,0 +1,97 @@ | |||
1 | Kernel driver jc42 | ||
2 | ================== | ||
3 | |||
4 | Supported chips: | ||
5 | * Analog Devices ADT7408 | ||
6 | Prefix: 'adt7408' | ||
7 | Addresses scanned: I2C 0x18 - 0x1f | ||
8 | Datasheets: | ||
9 | http://www.analog.com/static/imported-files/data_sheets/ADT7408.pdf | ||
10 | * IDT TSE2002B3, TS3000B3 | ||
11 | Prefix: 'tse2002b3', 'ts3000b3' | ||
12 | Addresses scanned: I2C 0x18 - 0x1f | ||
13 | Datasheets: | ||
14 | http://www.idt.com/products/getdoc.cfm?docid=18715691 | ||
15 | http://www.idt.com/products/getdoc.cfm?docid=18715692 | ||
16 | * Maxim MAX6604 | ||
17 | Prefix: 'max6604' | ||
18 | Addresses scanned: I2C 0x18 - 0x1f | ||
19 | Datasheets: | ||
20 | http://datasheets.maxim-ic.com/en/ds/MAX6604.pdf | ||
21 | * Microchip MCP9805, MCP98242, MCP98243, MCP9843 | ||
22 | Prefixes: 'mcp9805', 'mcp98242', 'mcp98243', 'mcp9843' | ||
23 | Addresses scanned: I2C 0x18 - 0x1f | ||
24 | Datasheets: | ||
25 | http://ww1.microchip.com/downloads/en/DeviceDoc/21977b.pdf | ||
26 | http://ww1.microchip.com/downloads/en/DeviceDoc/21996a.pdf | ||
27 | http://ww1.microchip.com/downloads/en/DeviceDoc/22153c.pdf | ||
28 | * NXP Semiconductors SE97, SE97B | ||
29 | Prefix: 'se97' | ||
30 | Addresses scanned: I2C 0x18 - 0x1f | ||
31 | Datasheets: | ||
32 | http://www.nxp.com/documents/data_sheet/SE97.pdf | ||
33 | http://www.nxp.com/documents/data_sheet/SE97B.pdf | ||
34 | * NXP Semiconductors SE98 | ||
35 | Prefix: 'se98' | ||
36 | Addresses scanned: I2C 0x18 - 0x1f | ||
37 | Datasheets: | ||
38 | http://www.nxp.com/documents/data_sheet/SE98.pdf | ||
39 | * ON Semiconductor CAT34TS02, CAT6095 | ||
40 | Prefix: 'cat34ts02', 'cat6095' | ||
41 | Addresses scanned: I2C 0x18 - 0x1f | ||
42 | Datasheet: | ||
43 | http://www.onsemi.com/pub_link/Collateral/CAT34TS02-D.PDF | ||
44 | http://www.onsemi.com/pub/Collateral/CAT6095-D.PDF | ||
45 | * ST Microelectronics STTS424, STTS424E02 | ||
46 | Prefix: 'stts424' | ||
47 | Addresses scanned: I2C 0x18 - 0x1f | ||
48 | Datasheets: | ||
49 | http://www.st.com/stonline/products/literature/ds/13447/stts424.pdf | ||
50 | http://www.st.com/stonline/products/literature/ds/13448/stts424e02.pdf | ||
51 | * JEDEC JC 42.4 compliant temperature sensor chips | ||
52 | Prefix: 'jc42' | ||
53 | Addresses scanned: I2C 0x18 - 0x1f | ||
54 | Datasheet: - | ||
55 | |||
56 | Author: | ||
57 | Guenter Roeck <guenter.roeck@ericsson.com> | ||
58 | |||
59 | |||
60 | Description | ||
61 | ----------- | ||
62 | |||
63 | This driver implements support for JEDEC JC 42.4 compliant temperature sensors. | ||
64 | The driver auto-detects the chips listed above, but can be manually instantiated | ||
65 | to support other JC 42.4 compliant chips. | ||
66 | |||
67 | Example: the following will load the driver for a generic JC 42.4 compliant | ||
68 | temperature sensor at address 0x18 on I2C bus #1: | ||
69 | |||
70 | # modprobe jc42 | ||
71 | # echo jc42 0x18 > /sys/bus/i2c/devices/i2c-1/new_device | ||
72 | |||
73 | A JC 42.4 compliant chip supports a single temperature sensor. Minimum, maximum, | ||
74 | and critical temperature can be configured. There are alarms for high, low, | ||
75 | and critical thresholds. | ||
76 | |||
77 | There is also an hysteresis to control the thresholds for resetting alarms. | ||
78 | Per JC 42.4 specification, the hysteresis threshold can be configured to 0, 1.5, | ||
79 | 3.0, and 6.0 degrees C. Configured hysteresis values will be rounded to those | ||
80 | limits. The chip supports only a single register to configure the hysteresis, | ||
81 | which applies to all limits. This register can be written by writing into | ||
82 | temp1_crit_hyst. Other hysteresis attributes are read-only. | ||
83 | |||
84 | Sysfs entries | ||
85 | ------------- | ||
86 | |||
87 | temp1_input Temperature (RO) | ||
88 | temp1_min Minimum temperature (RW) | ||
89 | temp1_max Maximum temperature (RW) | ||
90 | temp1_crit Critical high temperature (RW) | ||
91 | |||
92 | temp1_crit_hyst Critical hysteresis temperature (RW) | ||
93 | temp1_max_hyst Maximum hysteresis temperature (RO) | ||
94 | |||
95 | temp1_min_alarm Temperature low alarm | ||
96 | temp1_max_alarm Temperature high alarm | ||
97 | temp1_crit_alarm Temperature critical alarm | ||