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Commit | Line | Data |
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1 | Kernel driver it87 | |
2 | ================== | |
3 | ||
4 | Supported chips: | |
5 | ||
6 | * IT8603E/IT8623E | |
7 | ||
8 | Prefix: 'it8603' | |
9 | ||
10 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
11 | ||
12 | Datasheet: Not publicly available | |
13 | ||
14 | * IT8620E | |
15 | ||
16 | Prefix: 'it8620' | |
17 | ||
18 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
19 | ||
20 | * IT8628E | |
21 | ||
22 | Prefix: 'it8628' | |
23 | ||
24 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
25 | ||
26 | Datasheet: Not publicly available | |
27 | ||
28 | * IT8705F | |
29 | ||
30 | Prefix: 'it87' | |
31 | ||
32 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
33 | ||
34 | Datasheet: Once publicly available at the ITE website, but no longer | |
35 | ||
36 | * IT8712F | |
37 | ||
38 | Prefix: 'it8712' | |
39 | ||
40 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
41 | ||
42 | Datasheet: Once publicly available at the ITE website, but no longer | |
43 | ||
44 | * IT8716F/IT8726F | |
45 | ||
46 | Prefix: 'it8716' | |
47 | ||
48 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
49 | ||
50 | Datasheet: Once publicly available at the ITE website, but no longer | |
51 | ||
52 | * IT8718F | |
53 | ||
54 | Prefix: 'it8718' | |
55 | ||
56 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
57 | ||
58 | Datasheet: Once publicly available at the ITE website, but no longer | |
59 | ||
60 | * IT8720F | |
61 | ||
62 | Prefix: 'it8720' | |
63 | ||
64 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
65 | ||
66 | Datasheet: Not publicly available | |
67 | ||
68 | * IT8721F/IT8758E | |
69 | ||
70 | Prefix: 'it8721' | |
71 | ||
72 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
73 | ||
74 | Datasheet: Not publicly available | |
75 | ||
76 | * IT8728F | |
77 | ||
78 | Prefix: 'it8728' | |
79 | ||
80 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
81 | ||
82 | Datasheet: Not publicly available | |
83 | ||
84 | * IT8732F | |
85 | ||
86 | Prefix: 'it8732' | |
87 | ||
88 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
89 | ||
90 | Datasheet: Not publicly available | |
91 | ||
92 | * IT8771E | |
93 | ||
94 | Prefix: 'it8771' | |
95 | ||
96 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
97 | ||
98 | Datasheet: Not publicly available | |
99 | ||
100 | * IT8772E | |
101 | ||
102 | Prefix: 'it8772' | |
103 | ||
104 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
105 | ||
106 | Datasheet: Not publicly available | |
107 | ||
108 | * IT8781F | |
109 | ||
110 | Prefix: 'it8781' | |
111 | ||
112 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
113 | ||
114 | Datasheet: Not publicly available | |
115 | ||
116 | * IT8782F | |
117 | ||
118 | Prefix: 'it8782' | |
119 | ||
120 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
121 | ||
122 | Datasheet: Not publicly available | |
123 | ||
124 | * IT8783E/F | |
125 | ||
126 | Prefix: 'it8783' | |
127 | ||
128 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
129 | ||
130 | Datasheet: Not publicly available | |
131 | ||
132 | * IT8786E | |
133 | ||
134 | Prefix: 'it8786' | |
135 | ||
136 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
137 | ||
138 | Datasheet: Not publicly available | |
139 | ||
140 | * IT8790E | |
141 | ||
142 | Prefix: 'it8790' | |
143 | ||
144 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
145 | ||
146 | Datasheet: Not publicly available | |
147 | ||
148 | * SiS950 [clone of IT8705F] | |
149 | ||
150 | Prefix: 'it87' | |
151 | ||
152 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
153 | ||
154 | Datasheet: No longer be available | |
155 | ||
156 | ||
157 | Authors: | |
158 | - Christophe Gauthron | |
159 | - Jean Delvare <jdelvare@suse.de> | |
160 | ||
161 | ||
162 | Module Parameters | |
163 | ----------------- | |
164 | ||
165 | * update_vbat: int | |
166 | 0 if vbat should report power on value, 1 if vbat should be updated after | |
167 | each read. Default is 0. On some boards the battery voltage is provided | |
168 | by either the battery or the onboard power supply. Only the first reading | |
169 | at power on will be the actual battery voltage (which the chip does | |
170 | automatically). On other boards the battery voltage is always fed to | |
171 | the chip so can be read at any time. Excessive reading may decrease | |
172 | battery life but no information is given in the datasheet. | |
173 | ||
174 | * fix_pwm_polarity int | |
175 | Force PWM polarity to active high (DANGEROUS). Some chips are | |
176 | misconfigured by BIOS - PWM values would be inverted. This option tries | |
177 | to fix this. Please contact your BIOS manufacturer and ask him for fix. | |
178 | ||
179 | ||
180 | Hardware Interfaces | |
181 | ------------------- | |
182 | ||
183 | All the chips supported by this driver are LPC Super-I/O chips, accessed | |
184 | through the LPC bus (ISA-like I/O ports). The IT8712F additionally has an | |
185 | SMBus interface to the hardware monitoring functions. This driver no | |
186 | longer supports this interface though, as it is slower and less reliable | |
187 | than the ISA access, and was only available on a small number of | |
188 | motherboard models. | |
189 | ||
190 | ||
191 | Description | |
192 | ----------- | |
193 | ||
194 | This driver implements support for the IT8603E, IT8620E, IT8623E, IT8628E, | |
195 | IT8705F, IT8712F, IT8716F, IT8718F, IT8720F, IT8721F, IT8726F, IT8728F, IT8732F, | |
196 | IT8758E, IT8771E, IT8772E, IT8781F, IT8782F, IT8783E/F, IT8786E, IT8790E, and | |
197 | SiS950 chips. | |
198 | ||
199 | These chips are 'Super I/O chips', supporting floppy disks, infrared ports, | |
200 | joysticks and other miscellaneous stuff. For hardware monitoring, they | |
201 | include an 'environment controller' with 3 temperature sensors, 3 fan | |
202 | rotation speed sensors, 8 voltage sensors, associated alarms, and chassis | |
203 | intrusion detection. | |
204 | ||
205 | The IT8712F and IT8716F additionally feature VID inputs, used to report | |
206 | the Vcore voltage of the processor. The early IT8712F have 5 VID pins, | |
207 | the IT8716F and late IT8712F have 6. They are shared with other functions | |
208 | though, so the functionality may not be available on a given system. | |
209 | ||
210 | The IT8718F and IT8720F also features VID inputs (up to 8 pins) but the value | |
211 | is stored in the Super-I/O configuration space. Due to technical limitations, | |
212 | this value can currently only be read once at initialization time, so | |
213 | the driver won't notice and report changes in the VID value. The two | |
214 | upper VID bits share their pins with voltage inputs (in5 and in6) so you | |
215 | can't have both on a given board. | |
216 | ||
217 | The IT8716F, IT8718F, IT8720F, IT8721F/IT8758E and later IT8712F revisions | |
218 | have support for 2 additional fans. The additional fans are supported by the | |
219 | driver. | |
220 | ||
221 | The IT8716F, IT8718F, IT8720F, IT8721F/IT8758E, IT8732F, IT8781F, IT8782F, | |
222 | IT8783E/F, and late IT8712F and IT8705F also have optional 16-bit tachometer | |
223 | counters for fans 1 to 3. This is better (no more fan clock divider mess) but | |
224 | not compatible with the older chips and revisions. The 16-bit tachometer mode | |
225 | is enabled by the driver when one of the above chips is detected. | |
226 | ||
227 | The IT8726F is just bit enhanced IT8716F with additional hardware | |
228 | for AMD power sequencing. Therefore the chip will appear as IT8716F | |
229 | to userspace applications. | |
230 | ||
231 | The IT8728F, IT8771E, and IT8772E are considered compatible with the IT8721F, | |
232 | until a datasheet becomes available (hopefully.) | |
233 | ||
234 | The IT8603E/IT8623E is a custom design, hardware monitoring part is similar to | |
235 | IT8728F. It only supports 3 fans, 16-bit fan mode, and the full speed mode | |
236 | of the fan is not supported (value 0 of pwmX_enable). | |
237 | ||
238 | The IT8620E and IT8628E are custom designs, hardware monitoring part is similar | |
239 | to IT8728F. It only supports 16-bit fan mode. Both chips support up to 6 fans. | |
240 | ||
241 | The IT8790E supports up to 3 fans. 16-bit fan mode is always enabled. | |
242 | ||
243 | The IT8732F supports a closed-loop mode for fan control, but this is not | |
244 | currently implemented by the driver. | |
245 | ||
246 | Temperatures are measured in degrees Celsius. An alarm is triggered once | |
247 | when the Overtemperature Shutdown limit is crossed. | |
248 | ||
249 | Fan rotation speeds are reported in RPM (rotations per minute). An alarm is | |
250 | triggered if the rotation speed has dropped below a programmable limit. When | |
251 | 16-bit tachometer counters aren't used, fan readings can be divided by | |
252 | a programmable divider (1, 2, 4 or 8) to give the readings more range or | |
253 | accuracy. With a divider of 2, the lowest representable value is around | |
254 | 2600 RPM. Not all RPM values can accurately be represented, so some rounding | |
255 | is done. | |
256 | ||
257 | Voltage sensors (also known as IN sensors) report their values in volts. An | |
258 | alarm is triggered if the voltage has crossed a programmable minimum or | |
259 | maximum limit. Note that minimum in this case always means 'closest to | |
260 | zero'; this is important for negative voltage measurements. On most chips, all | |
261 | voltage inputs can measure voltages between 0 and 4.08 volts, with a resolution | |
262 | of 0.016 volt. IT8603E, IT8721F/IT8758E and IT8728F can measure between 0 and | |
263 | 3.06 volts, with a resolution of 0.012 volt. IT8732F can measure between 0 and | |
264 | 2.8 volts with a resolution of 0.0109 volt. The battery voltage in8 does not | |
265 | have limit registers. | |
266 | ||
267 | On the IT8603E, IT8620E, IT8628E, IT8721F/IT8758E, IT8732F, IT8781F, IT8782F, | |
268 | and IT8783E/F, some voltage inputs are internal and scaled inside the chip: | |
269 | * in3 (optional) | |
270 | * in7 (optional for IT8781F, IT8782F, and IT8783E/F) | |
271 | * in8 (always) | |
272 | * in9 (relevant for IT8603E only) | |
273 | The driver handles this transparently so user-space doesn't have to care. | |
274 | ||
275 | The VID lines (IT8712F/IT8716F/IT8718F/IT8720F) encode the core voltage value: | |
276 | the voltage level your processor should work with. This is hardcoded by | |
277 | the mainboard and/or processor itself. It is a value in volts. | |
278 | ||
279 | If an alarm triggers, it will remain triggered until the hardware register | |
280 | is read at least once. This means that the cause for the alarm may already | |
281 | have disappeared! Note that in the current implementation, all hardware | |
282 | registers are read whenever any data is read (unless it is less than 1.5 | |
283 | seconds since the last update). This means that you can easily miss | |
284 | once-only alarms. | |
285 | ||
286 | Out-of-limit readings can also result in beeping, if the chip is properly | |
287 | wired and configured. Beeping can be enabled or disabled per sensor type | |
288 | (temperatures, voltages and fans.) | |
289 | ||
290 | The IT87xx only updates its values each 1.5 seconds; reading it more often | |
291 | will do no harm, but will return 'old' values. | |
292 | ||
293 | To change sensor N to a thermistor, 'echo 4 > tempN_type' where N is 1, 2, | |
294 | or 3. To change sensor N to a thermal diode, 'echo 3 > tempN_type'. | |
295 | Give 0 for unused sensor. Any other value is invalid. To configure this at | |
296 | startup, consult lm_sensors's /etc/sensors.conf. (4 = thermistor; | |
297 | 3 = thermal diode) | |
298 | ||
299 | ||
300 | Fan speed control | |
301 | ----------------- | |
302 | ||
303 | The fan speed control features are limited to manual PWM mode. Automatic | |
304 | "Smart Guardian" mode control handling is only implemented for older chips | |
305 | (see below.) However if you want to go for "manual mode" just write 1 to | |
306 | pwmN_enable. | |
307 | ||
308 | If you are only able to control the fan speed with very small PWM values, | |
309 | try lowering the PWM base frequency (pwm1_freq). Depending on the fan, | |
310 | it may give you a somewhat greater control range. The same frequency is | |
311 | used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are | |
312 | read-only. | |
313 | ||
314 | ||
315 | Automatic fan speed control (old interface) | |
316 | ------------------------------------------- | |
317 | ||
318 | The driver supports the old interface to automatic fan speed control | |
319 | which is implemented by IT8705F chips up to revision F and IT8712F | |
320 | chips up to revision G. | |
321 | ||
322 | This interface implements 4 temperature vs. PWM output trip points. | |
323 | The PWM output of trip point 4 is always the maximum value (fan running | |
324 | at full speed) while the PWM output of the other 3 trip points can be | |
325 | freely chosen. The temperature of all 4 trip points can be freely chosen. | |
326 | Additionally, trip point 1 has an hysteresis temperature attached, to | |
327 | prevent fast switching between fan on and off. | |
328 | ||
329 | The chip automatically computes the PWM output value based on the input | |
330 | temperature, based on this simple rule: if the temperature value is | |
331 | between trip point N and trip point N+1 then the PWM output value is | |
332 | the one of trip point N. The automatic control mode is less flexible | |
333 | than the manual control mode, but it reacts faster, is more robust and | |
334 | doesn't use CPU cycles. | |
335 | ||
336 | Trip points must be set properly before switching to automatic fan speed | |
337 | control mode. The driver will perform basic integrity checks before | |
338 | actually switching to automatic control mode. | |
339 | ||
340 | ||
341 | Temperature offset attributes | |
342 | ----------------------------- | |
343 | ||
344 | The driver supports temp[1-3]_offset sysfs attributes to adjust the reported | |
345 | temperature for thermal diodes or diode-connected thermal transistors. | |
346 | If a temperature sensor is configured for thermistors, the attribute values | |
347 | are ignored. If the thermal sensor type is Intel PECI, the temperature offset | |
348 | must be programmed to the critical CPU temperature. |