1 Kernel driver smsc47m1 1 Kernel driver smsc47m1
2 ====================== 2 ======================
3 3
4 Supported chips: 4 Supported chips:
5 5
6 * SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC4 6 * SMSC LPC47B27x, LPC47M112, LPC47M10x, LPC47M13x, LPC47M14x,
7 7
8 LPC47M15x and LPC47M192 8 LPC47M15x and LPC47M192
9 9
10 Addresses scanned: none, address read from 10 Addresses scanned: none, address read from Super I/O config space
11 11
12 Prefix: 'smsc47m1' 12 Prefix: 'smsc47m1'
13 13
14 Datasheets: 14 Datasheets:
15 15
16 http://www.smsc.com/media/Downloads_Pu 16 http://www.smsc.com/media/Downloads_Public/Data_Sheets/47b272.pdf
17 17
18 http://www.smsc.com/media/Downloads_Pu 18 http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m10x.pdf
19 19
20 http://www.smsc.com/media/Downloads_Pu 20 http://www.smsc.com/media/Downloads_Public/Data_Sheets/47m112.pdf
21 21
22 http://www.smsc.com/ 22 http://www.smsc.com/
23 23
24 * SMSC LPC47M292 24 * SMSC LPC47M292
25 25
26 Addresses scanned: none, address read from 26 Addresses scanned: none, address read from Super I/O config space
27 27
28 Prefix: 'smsc47m2' 28 Prefix: 'smsc47m2'
29 29
30 Datasheet: Not public 30 Datasheet: Not public
31 31
32 * SMSC LPC47M997 32 * SMSC LPC47M997
33 33
34 Addresses scanned: none, address read from 34 Addresses scanned: none, address read from Super I/O config space
35 35
36 Prefix: 'smsc47m1' 36 Prefix: 'smsc47m1'
37 37
38 Datasheet: none 38 Datasheet: none
39 39
40 40
41 41
42 Authors: 42 Authors:
43 43
44 - Mark D. Studebaker <mdsxyz123@yahoo.com> 44 - Mark D. Studebaker <mdsxyz123@yahoo.com>,
45 - With assistance from Bruce Allen <ballen 45 - With assistance from Bruce Allen <ballen@uwm.edu>, and his
46 fan.c program: 46 fan.c program:
47 47
48 - http://www.lsc-group.phys.uwm.edu/%7E 48 - http://www.lsc-group.phys.uwm.edu/%7Eballen/driver/
49 49
50 - Gabriele Gorla <gorlik@yahoo.com>, 50 - Gabriele Gorla <gorlik@yahoo.com>,
51 - Jean Delvare <jdelvare@suse.de> 51 - Jean Delvare <jdelvare@suse.de>
52 52
53 Description 53 Description
54 ----------- 54 -----------
55 55
56 The Standard Microsystems Corporation (SMSC) 4 56 The Standard Microsystems Corporation (SMSC) 47M1xx Super I/O chips
57 contain monitoring and PWM control circuitry f 57 contain monitoring and PWM control circuitry for two fans.
58 58
59 The LPC47M15x, LPC47M192 and LPC47M292 chips c 59 The LPC47M15x, LPC47M192 and LPC47M292 chips contain a full 'hardware
60 monitoring block' in addition to the fan monit 60 monitoring block' in addition to the fan monitoring and control. The
61 hardware monitoring block is not supported by 61 hardware monitoring block is not supported by this driver, use the
62 smsc47m192 driver for that. 62 smsc47m192 driver for that.
63 63
64 No documentation is available for the 47M997, 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 65 ID as the 47M15x and 47M192 chips and seems to be compatible.
66 66
67 Fan rotation speeds are reported in RPM (rotat 67 Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
68 triggered if the rotation speed has dropped be 68 triggered if the rotation speed has dropped below a programmable limit. Fan
69 readings can be divided by a programmable divi 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 R 70 the readings more range or accuracy. Not all RPM values can accurately be
71 represented, so some rounding is done. With a 71 represented, so some rounding is done. With a divider of 2, the lowest
72 representable value is around 2600 RPM. 72 representable value is around 2600 RPM.
73 73
74 PWM values are from 0 to 255. 74 PWM values are from 0 to 255.
75 75
76 If an alarm triggers, it will remain triggered 76 If an alarm triggers, it will remain triggered until the hardware register
77 is read at least once. This means that the cau 77 is read at least once. This means that the cause for the alarm may
78 already have disappeared! Note that in the cur 78 already have disappeared! Note that in the current implementation, all
79 hardware registers are read whenever any data 79 hardware registers are read whenever any data is read (unless it is less
80 than 1.5 seconds since the last update). This 80 than 1.5 seconds since the last update). This means that you can easily
81 miss once-only alarms. 81 miss once-only alarms.
82 82
83 ---------------------------------------------- 83 ------------------------------------------------------------------
84 84
85 The lm_sensors project gratefully acknowledges 85 The lm_sensors project gratefully acknowledges the support of
86 Intel in the development of this driver. 86 Intel in the development of this driver.
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.