projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 7f15b664 RM |
1 | Kernel driver smsc47m1 |
| 2 | ====================== | |
| 3 | ||
| 4 | Supported chips: | |
| b04f2f7d | 5 | |
| 6091780e | 6 | * SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC47M13x, LPC47M14x, |
| b04f2f7d | 7 | |
| 6091780e | 8 | LPC47M15x and LPC47M192 |
| b04f2f7d | 9 | |
| 7f15b664 | 10 | Addresses scanned: none, address read from Super I/O config space |
| b04f2f7d | 11 | |
| 7f15b664 | 12 | Prefix: 'smsc47m1' |
| b04f2f7d | 13 | |
| 7f15b664 | 14 | Datasheets: |
| b04f2f7d MCC |
15 | |
| 16 | http://www.smsc.com/media/Downloads_Public/Data_Sheets/47b272.pdf | |
| 17 | ||
| 18 | http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m10x.pdf | |
| 19 | ||
| 20 | http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m112.pdf | |
| 21 | ||
| 22 | http://www.smsc.com/ | |
| 23 | ||
| 8eccbb6f | 24 | * SMSC LPC47M292 |
| b04f2f7d | 25 | |
| 8eccbb6f | 26 | Addresses scanned: none, address read from Super I/O config space |
| b04f2f7d | 27 | |
| 8eccbb6f | 28 | Prefix: 'smsc47m2' |
| b04f2f7d | 29 | |
| 8eccbb6f | 30 | Datasheet: Not public |
| b04f2f7d | 31 | |
| b890a07f | 32 | * SMSC LPC47M997 |
| b04f2f7d | 33 | |
| b890a07f | 34 | Addresses scanned: none, address read from Super I/O config space |
| b04f2f7d | 35 | |
| b890a07f | 36 | Prefix: 'smsc47m1' |
| b04f2f7d | 37 | |
| b890a07f | 38 | Datasheet: none |
| 7f15b664 | 39 | |
| b04f2f7d MCC |
40 | |
| 41 | ||
| 7f15b664 | 42 | Authors: |
| b04f2f7d MCC |
43 | |
| 44 | - Mark D. Studebaker <mdsxyz123@yahoo.com>, | |
| 45 | - With assistance from Bruce Allen <ballen@uwm.edu>, and his | |
| 46 | fan.c program: | |
| 47 | ||
| 48 | - http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/ | |
| 49 | ||
| 50 | - Gabriele Gorla <gorlik@yahoo.com>, | |
| 51 | - Jean Delvare <jdelvare@suse.de> | |
| 7f15b664 RM |
52 | |
| 53 | Description | |
| 54 | ----------- | |
| 55 | ||
| 56 | The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips | |
| 57 | contain monitoring and PWM control circuitry for two fans. | |
| 58 | ||
| 8eccbb6f JD |
59 | The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware |
| 60 | monitoring block' in addition to the fan monitoring and control. The | |
| 61 | hardware monitoring block is not supported by this driver, use the | |
| 62 | smsc47m192 driver for that. | |
| 7f15b664 | 63 | |
| b890a07f JD |
64 | No documentation is available for the 47M997, but it has the same device |
| 65 | ID as the 47M15x and 47M192 chips and seems to be compatible. | |
| 66 | ||
| 7f15b664 RM |
67 | Fan rotation speeds are reported in RPM (rotations per minute). An alarm is |
| 68 | triggered if the rotation speed has dropped below a programmable limit. Fan | |
| 69 | readings can be divided by a programmable divider (1, 2, 4 or 8) to give | |
| 70 | the readings more range or accuracy. Not all RPM values can accurately be | |
| 71 | represented, so some rounding is done. With a divider of 2, the lowest | |
| 72 | representable value is around 2600 RPM. | |
| 73 | ||
| 74 | PWM values are from 0 to 255. | |
| 75 | ||
| 76 | If an alarm triggers, it will remain triggered until the hardware register | |
| 77 | is read at least once. This means that the cause for the alarm may | |
| 78 | already have disappeared! Note that in the current implementation, all | |
| 79 | hardware registers are read whenever any data is read (unless it is less | |
| 80 | than 1.5 seconds since the last update). This means that you can easily | |
| 81 | miss once-only alarms. | |
| 82 | ||
| b04f2f7d | 83 | ------------------------------------------------------------------ |
| 7f15b664 | 84 | |
| 7f15b664 RM |
85 | The lm_sensors project gratefully acknowledges the support of |
| 86 | Intel in the development of this driver. |