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1 | Kernel driver w83791d |
2 | ===================== |
3 | |
4 | Supported chips: |
5 | * Winbond W83791D |
6 | Prefix: 'w83791d' |
7 | Addresses scanned: I2C 0x2c - 0x2f |
8 | Datasheet: http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83791D_W83791Gb.pdf |
9 | |
10 | Author: Charles Spirakis <bezaur@gmail.com> |
11 | |
12 | This driver was derived from the w83781d.c and w83792d.c source files. |
13 | |
14 | Credits: |
15 | w83781d.c: |
16 | Frodo Looijaard <frodol@dds.nl>, |
17 | Philip Edelbrock <phil@netroedge.com>, |
18 | and Mark Studebaker <mdsxyz123@yahoo.com> |
19 | w83792d.c: |
20 | Chunhao Huang <DZShen@Winbond.com.tw>, |
21 | Rudolf Marek <r.marek@assembler.cz> |
22 | |
23 | Additional contributors: |
24 | Sven Anders <anders@anduras.de> |
25 | Marc Hulsman <m.hulsman@tudelft.nl> |
26 | |
27 | Module Parameters |
28 | ----------------- |
29 | |
30 | * init boolean |
31 | (default 0) |
32 | Use 'init=1' to have the driver do extra software initializations. |
33 | The default behavior is to do the minimum initialization possible |
34 | and depend on the BIOS to properly setup the chip. If you know you |
35 | have a w83791d and you're having problems, try init=1 before trying |
36 | reset=1. |
37 | |
38 | * reset boolean |
39 | (default 0) |
40 | Use 'reset=1' to reset the chip (via index 0x40, bit 7). The default |
41 | behavior is no chip reset to preserve BIOS settings. |
42 | |
43 | * force_subclients=bus,caddr,saddr,saddr |
44 | This is used to force the i2c addresses for subclients of |
45 | a certain chip. Example usage is `force_subclients=0,0x2f,0x4a,0x4b' |
46 | to force the subclients of chip 0x2f on bus 0 to i2c addresses |
47 | 0x4a and 0x4b. |
48 | |
49 | |
50 | Description |
51 | ----------- |
52 | |
53 | This driver implements support for the Winbond W83791D chip. The W83791G |
54 | chip appears to be the same as the W83791D but is lead free. |
55 | |
56 | Detection of the chip can sometimes be foiled because it can be in an |
57 | internal state that allows no clean access (Bank with ID register is not |
58 | currently selected). If you know the address of the chip, use a 'force' |
59 | parameter; this will put it into a more well-behaved state first. |
60 | |
61 | The driver implements three temperature sensors, ten voltage sensors, |
62 | five fan rotation speed sensors and manual PWM control of each fan. |
63 | |
64 | Temperatures are measured in degrees Celsius and measurement resolution is 1 |
65 | degC for temp1 and 0.5 degC for temp2 and temp3. An alarm is triggered when |
66 | the temperature gets higher than the Overtemperature Shutdown value; it stays |
67 | on until the temperature falls below the Hysteresis value. |
68 | |
69 | Voltage sensors (also known as IN sensors) report their values in millivolts. |
70 | An alarm is triggered if the voltage has crossed a programmable minimum |
71 | or maximum limit. |
72 | |
73 | Fan rotation speeds are reported in RPM (rotations per minute). An alarm is |
74 | triggered if the rotation speed has dropped below a programmable limit. Fan |
75 | readings can be divided by a programmable divider (1, 2, 4, 8, 16, |
76 | 32, 64 or 128 for all fans) to give the readings more range or accuracy. |
77 | |
78 | Each fan controlled is controlled by PWM. The PWM duty cycle can be read and |
79 | set for each fan separately. Valid values range from 0 (stop) to 255 (full). |
80 | PWM 1-3 support Thermal Cruise mode, in which the PWMs are automatically |
81 | regulated to keep respectively temp 1-3 at a certain target temperature. |
82 | See below for the description of the sysfs-interface. |
83 | |
84 | The w83791d has a global bit used to enable beeping from the speaker when an |
85 | alarm is triggered as well as a bitmask to enable or disable the beep for |
86 | specific alarms. You need both the global beep enable bit and the |
87 | corresponding beep bit to be on for a triggered alarm to sound a beep. |
88 | |
89 | The sysfs interface to the global enable is via the sysfs beep_enable file. |
90 | This file is used for both legacy and new code. |
91 | |
92 | The sysfs interface to the beep bitmask has migrated from the original legacy |
93 | method of a single sysfs beep_mask file to a newer method using multiple |
94 | *_beep files as described in .../Documentation/hwmon/sysfs-interface. |
95 | |
96 | A similar change has occurred for the bitmap corresponding to the alarms. The |
97 | original legacy method used a single sysfs alarms file containing a bitmap |
98 | of triggered alarms. The newer method uses multiple sysfs *_alarm files |
99 | (again following the pattern described in sysfs-interface). |
100 | |
101 | Since both methods read and write the underlying hardware, they can be used |
102 | interchangeably and changes in one will automatically be reflected by |
103 | the other. If you use the legacy bitmask method, your user-space code is |
104 | responsible for handling the fact that the alarms and beep_mask bitmaps |
105 | are not the same (see the table below). |
106 | |
107 | NOTE: All new code should be written to use the newer sysfs-interface |
108 | specification as that avoids bitmap problems and is the preferred interface |
109 | going forward. |
110 | |
111 | The driver reads the hardware chip values at most once every three seconds. |
112 | User mode code requesting values more often will receive cached values. |
113 | |
114 | /sys files |
115 | ---------- |
116 | The sysfs-interface is documented in the 'sysfs-interface' file. Only |
117 | chip-specific options are documented here. |
118 | |
119 | pwm[1-3]_enable - this file controls mode of fan/temperature control for |
120 | fan 1-3. Fan/PWM 4-5 only support manual mode. |
121 | * 1 Manual mode |
122 | * 2 Thermal Cruise mode |
123 | * 3 Fan Speed Cruise mode (no further support) |
124 | |
125 | temp[1-3]_target - defines the target temperature for Thermal Cruise mode. |
126 | Unit: millidegree Celsius |
127 | RW |
128 | |
129 | temp[1-3]_tolerance - temperature tolerance for Thermal Cruise mode. |
130 | Specifies an interval around the target temperature |
131 | in which the fan speed is not changed. |
132 | Unit: millidegree Celsius |
133 | RW |
134 | |
135 | Alarms bitmap vs. beep_mask bitmask |
136 | ------------------------------------ |
137 | For legacy code using the alarms and beep_mask files: |
138 | |
139 | in0 (VCORE) : alarms: 0x000001 beep_mask: 0x000001 |
140 | in1 (VINR0) : alarms: 0x000002 beep_mask: 0x002000 <== mismatch |
141 | in2 (+3.3VIN): alarms: 0x000004 beep_mask: 0x000004 |
142 | in3 (5VDD) : alarms: 0x000008 beep_mask: 0x000008 |
143 | in4 (+12VIN) : alarms: 0x000100 beep_mask: 0x000100 |
144 | in5 (-12VIN) : alarms: 0x000200 beep_mask: 0x000200 |
145 | in6 (-5VIN) : alarms: 0x000400 beep_mask: 0x000400 |
146 | in7 (VSB) : alarms: 0x080000 beep_mask: 0x010000 <== mismatch |
147 | in8 (VBAT) : alarms: 0x100000 beep_mask: 0x020000 <== mismatch |
148 | in9 (VINR1) : alarms: 0x004000 beep_mask: 0x004000 |
149 | temp1 : alarms: 0x000010 beep_mask: 0x000010 |
150 | temp2 : alarms: 0x000020 beep_mask: 0x000020 |
151 | temp3 : alarms: 0x002000 beep_mask: 0x000002 <== mismatch |
152 | fan1 : alarms: 0x000040 beep_mask: 0x000040 |
153 | fan2 : alarms: 0x000080 beep_mask: 0x000080 |
154 | fan3 : alarms: 0x000800 beep_mask: 0x000800 |
155 | fan4 : alarms: 0x200000 beep_mask: 0x200000 |
156 | fan5 : alarms: 0x400000 beep_mask: 0x400000 |
157 | tart1 : alarms: 0x010000 beep_mask: 0x040000 <== mismatch |
158 | tart2 : alarms: 0x020000 beep_mask: 0x080000 <== mismatch |
159 | tart3 : alarms: 0x040000 beep_mask: 0x100000 <== mismatch |
160 | case_open : alarms: 0x001000 beep_mask: 0x001000 |
161 | global_enable: alarms: -------- beep_mask: 0x800000 (modified via beep_enable) |
162 |
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