drivers/hwmon/drivetemp.c

3  * Hwmon client for disk and solid state drives with temperature sensors
7  *    Hwmon client for S.M.A.R.T. hard disk drives with temperature sensors.
10  *    hwmon: Driver for SCSI/ATA temperature sensors
13  * This drive supports reporting the temperature of SATA drives. It can be
14  * easily extended to report the temperature of SCSI drives.
16  * The primary means to read drive temperatures and temperature limits
19  * It can be used to read the current drive temperature, temperature limits,
32  * 190	Temperature	Temperature, monitored by a sensor somewhere inside
34  *			temperature (hexadecimal) in its rightmost two digits.
36  * 194	Temperature	Temperature, monitored by a sensor somewhere inside
38  *			temperature (hexadecimal) in its rightmost two digits.
40  * 231	Temperature	Temperature, monitored by a sensor somewhere inside
42  *			temperature (hexadecimal) in its rightmost two digits.
46  * 190	Temperature	Value is equal to (100-temp. °C), allowing manufacturer
48  *	Airflow		maximum temperature. This also follows the convention of
49  *	Temperature	100 being a best-case value and lower values being
51  *			report raw Temperature (identical to 0xC2) or
52  *			Temperature minus 50 here.
53  * 194	Temperature or	Indicates the device temperature, if the appropriate
54  *	Temperature	sensor is fitted. Lowest byte of the raw value contains
55  *	Celsius		the exact temperature value (Celsius degrees).
58  *	Temperature	A normalized value of 100 represents a new drive, with
63  *			Temperature (more typically reported at 0xC2).
65  * Common denominator is that the first raw byte reports the temperature
67  * temperature in the second raw byte.
70  * - SAMSUNG SV0412H and SAMSUNG SV1204H) report the temperature in 10th
77  * Also, the second raw byte (possibly reporting the fractional temperature)
80  * Many drives also report temperature limits in additional SMART data raw
86  * in attribute 231, but do not support temperature sensors. For this reason,
91  *   temperature and, if available, temperature limits.
93  *   the temperature.
95  *   the temperature.
290  * freeze until power-cycled under heavy write loads when their temperature is
367 			   "will avoid using SCT for temperature monitoring\n");  in drivetemp_identify_sata()
393 	/* Request and read temperature history table */  in drivetemp_identify_sata()
397 	buf[4] = 2;	/* temperature history table */  in drivetemp_identify_sata()
408 	 * Temperature limits per AT Attachment 8 -  in drivetemp_identify_sata()
621 MODULE_DESCRIPTION("Hard drive temperature monitor");