Commit | Line | Data |
---|---|---|
9de2e2e8 GR |
1 | Kernel driver NCT6775 |
2 | ===================== | |
3 | ||
b32570a4 MCC |
4 | .. note:: |
5 | ||
6 | This driver supersedes the NCT6775F and NCT6776F support in the W83627EHF | |
7 | driver. | |
8 | ||
9de2e2e8 | 9 | Supported chips: |
b32570a4 | 10 | |
b6e6dd8e | 11 | * Nuvoton NCT6102D/NCT6104D/NCT6106D |
b32570a4 | 12 | |
b6e6dd8e | 13 | Prefix: 'nct6106' |
b32570a4 | 14 | |
b6e6dd8e | 15 | Addresses scanned: ISA address retrieved from Super I/O registers |
b32570a4 | 16 | |
b6e6dd8e | 17 | Datasheet: Available from the Nuvoton web site |
b32570a4 | 18 | |
2c7fd30d | 19 | * Nuvoton NCT5572D/NCT6771F/NCT6772F/NCT6775F/W83677HG-I |
b32570a4 | 20 | |
9de2e2e8 | 21 | Prefix: 'nct6775' |
b32570a4 | 22 | |
9de2e2e8 | 23 | Addresses scanned: ISA address retrieved from Super I/O registers |
b32570a4 | 24 | |
9de2e2e8 | 25 | Datasheet: Available from Nuvoton upon request |
b32570a4 | 26 | |
b6e6dd8e | 27 | * Nuvoton NCT5573D/NCT5577D/NCT6776D/NCT6776F |
b32570a4 | 28 | |
9de2e2e8 | 29 | Prefix: 'nct6776' |
b32570a4 | 30 | |
9de2e2e8 | 31 | Addresses scanned: ISA address retrieved from Super I/O registers |
b32570a4 | 32 | |
9de2e2e8 | 33 | Datasheet: Available from Nuvoton upon request |
b32570a4 | 34 | |
2c7fd30d | 35 | * Nuvoton NCT5532D/NCT6779D |
b32570a4 | 36 | |
9de2e2e8 | 37 | Prefix: 'nct6779' |
b32570a4 | 38 | |
9de2e2e8 | 39 | Addresses scanned: ISA address retrieved from Super I/O registers |
b32570a4 | 40 | |
9de2e2e8 | 41 | Datasheet: Available from Nuvoton upon request |
b32570a4 | 42 | |
b6e6dd8e | 43 | * Nuvoton NCT6791D |
b32570a4 | 44 | |
b6e6dd8e | 45 | Prefix: 'nct6791' |
b32570a4 | 46 | |
b6e6dd8e | 47 | Addresses scanned: ISA address retrieved from Super I/O registers |
b32570a4 | 48 | |
b6e6dd8e | 49 | Datasheet: Available from Nuvoton upon request |
b32570a4 | 50 | |
8aefb93f | 51 | * Nuvoton NCT6792D |
b32570a4 | 52 | |
8aefb93f | 53 | Prefix: 'nct6792' |
b32570a4 | 54 | |
8aefb93f | 55 | Addresses scanned: ISA address retrieved from Super I/O registers |
b32570a4 | 56 | |
8aefb93f | 57 | Datasheet: Available from Nuvoton upon request |
b32570a4 | 58 | |
cd1faefa | 59 | * Nuvoton NCT6793D |
b32570a4 | 60 | |
cd1faefa | 61 | Prefix: 'nct6793' |
b32570a4 | 62 | |
cd1faefa | 63 | Addresses scanned: ISA address retrieved from Super I/O registers |
b32570a4 | 64 | |
cd1faefa | 65 | Datasheet: Available from Nuvoton upon request |
b32570a4 | 66 | |
81820059 | 67 | * Nuvoton NCT6795D |
b32570a4 | 68 | |
81820059 | 69 | Prefix: 'nct6795' |
b32570a4 | 70 | |
81820059 | 71 | Addresses scanned: ISA address retrieved from Super I/O registers |
b32570a4 | 72 | |
81820059 | 73 | Datasheet: Available from Nuvoton upon request |
b32570a4 | 74 | |
81820059 | 75 | * Nuvoton NCT6796D |
b32570a4 | 76 | |
81820059 | 77 | Prefix: 'nct6796' |
b32570a4 | 78 | |
81820059 | 79 | Addresses scanned: ISA address retrieved from Super I/O registers |
b32570a4 | 80 | |
81820059 | 81 | Datasheet: Available from Nuvoton upon request |
9de2e2e8 | 82 | |
b32570a4 MCC |
83 | |
84 | ||
9de2e2e8 | 85 | Authors: |
b32570a4 MCC |
86 | |
87 | Guenter Roeck <linux@roeck-us.net> | |
9de2e2e8 GR |
88 | |
89 | Description | |
90 | ----------- | |
91 | ||
92 | This driver implements support for the Nuvoton NCT6775F, NCT6776F, and NCT6779D | |
2c7fd30d | 93 | and compatible super I/O chips. |
9de2e2e8 GR |
94 | |
95 | The chips support up to 25 temperature monitoring sources. Up to 6 of those are | |
96 | direct temperature sensor inputs, the others are special sources such as PECI, | |
97 | PCH, and SMBUS. Depending on the chip type, 2 to 6 of the temperature sources | |
98 | can be monitored and compared against minimum, maximum, and critical | |
99 | temperatures. The driver reports up to 10 of the temperatures to the user. | |
100 | There are 4 to 5 fan rotation speed sensors, 8 to 15 analog voltage sensors, | |
101 | one VID, alarms with beep warnings (control unimplemented), and some automatic | |
102 | fan regulation strategies (plus manual fan control mode). | |
103 | ||
104 | The temperature sensor sources on all chips are configurable. The configured | |
105 | source for each of the temperature sensors is provided in tempX_label. | |
106 | ||
107 | Temperatures are measured in degrees Celsius and measurement resolution is | |
108 | either 1 degC or 0.5 degC, depending on the temperature source and | |
109 | configuration. An alarm is triggered when the temperature gets higher than | |
110 | the high limit; it stays on until the temperature falls below the hysteresis | |
111 | value. Alarms are only supported for temp1 to temp6, depending on the chip type. | |
112 | ||
113 | Fan rotation speeds are reported in RPM (rotations per minute). An alarm is | |
114 | triggered if the rotation speed has dropped below a programmable limit. On | |
115 | NCT6775F, fan readings can be divided by a programmable divider (1, 2, 4, 8, | |
116 | 16, 32, 64 or 128) to give the readings more range or accuracy; the other chips | |
117 | do not have a fan speed divider. The driver sets the most suitable fan divisor | |
1c65dc36 GR |
118 | itself; specifically, it increases the divider value each time a fan speed |
119 | reading returns an invalid value, and it reduces it if the fan speed reading | |
120 | is lower than optimal. Some fans might not be present because they share pins | |
9de2e2e8 GR |
121 | with other functions. |
122 | ||
123 | Voltage sensors (also known as IN sensors) report their values in millivolts. | |
124 | An alarm is triggered if the voltage has crossed a programmable minimum | |
125 | or maximum limit. | |
126 | ||
127 | The driver supports automatic fan control mode known as Thermal Cruise. | |
128 | In this mode, the chip attempts to keep the measured temperature in a | |
129 | predefined temperature range. If the temperature goes out of range, fan | |
130 | is driven slower/faster to reach the predefined range again. | |
131 | ||
132 | The mode works for fan1-fan5. | |
133 | ||
77eb5b37 GR |
134 | sysfs attributes |
135 | ---------------- | |
136 | ||
b32570a4 MCC |
137 | pwm[1-7] |
138 | - this file stores PWM duty cycle or DC value (fan speed) in range: | |
139 | ||
77eb5b37 GR |
140 | 0 (lowest speed) to 255 (full) |
141 | ||
b32570a4 MCC |
142 | pwm[1-7]_enable |
143 | - this file controls mode of fan/temperature control: | |
144 | ||
77eb5b37 GR |
145 | * 0 Fan control disabled (fans set to maximum speed) |
146 | * 1 Manual mode, write to pwm[0-5] any value 0-255 | |
147 | * 2 "Thermal Cruise" mode | |
148 | * 3 "Fan Speed Cruise" mode | |
149 | * 4 "Smart Fan III" mode (NCT6775F only) | |
150 | * 5 "Smart Fan IV" mode | |
151 | ||
b32570a4 MCC |
152 | pwm[1-7]_mode |
153 | - controls if output is PWM or DC level | |
154 | ||
155 | * 0 DC output | |
156 | * 1 PWM output | |
77eb5b37 | 157 | |
cdcaeceb GR |
158 | Common fan control attributes |
159 | ----------------------------- | |
160 | ||
b32570a4 MCC |
161 | pwm[1-7]_temp_sel |
162 | Temperature source. Value is temperature sensor index. | |
cdcaeceb | 163 | For example, select '1' for temp1_input. |
b32570a4 | 164 | |
81820059 | 165 | pwm[1-7]_weight_temp_sel |
bbd8decd GR |
166 | Secondary temperature source. Value is temperature |
167 | sensor index. For example, select '1' for temp1_input. | |
168 | Set to 0 to disable secondary temperature control. | |
169 | ||
170 | If secondary temperature functionality is enabled, it is controlled with the | |
171 | following attributes. | |
172 | ||
81820059 | 173 | pwm[1-7]_weight_duty_step |
bbd8decd | 174 | Duty step size. |
b32570a4 | 175 | |
81820059 | 176 | pwm[1-7]_weight_temp_step |
bbd8decd GR |
177 | Temperature step size. With each step over |
178 | temp_step_base, the value of weight_duty_step is added | |
179 | to the current pwm value. | |
b32570a4 | 180 | |
81820059 | 181 | pwm[1-7]_weight_temp_step_base |
bbd8decd GR |
182 | Temperature at which secondary temperature control kicks |
183 | in. | |
b32570a4 | 184 | |
81820059 | 185 | pwm[1-7]_weight_temp_step_tol |
bbd8decd | 186 | Temperature step tolerance. |
cdcaeceb GR |
187 | |
188 | Thermal Cruise mode (2) | |
189 | ----------------------- | |
190 | ||
191 | If the temperature is in the range defined by: | |
192 | ||
b32570a4 MCC |
193 | pwm[1-7]_target_temp |
194 | Target temperature, unit millidegree Celsius | |
cdcaeceb | 195 | (range 0 - 127000) |
b32570a4 | 196 | |
81820059 | 197 | pwm[1-7]_temp_tolerance |
cdcaeceb GR |
198 | Target temperature tolerance, unit millidegree Celsius |
199 | ||
b32570a4 | 200 | There are no changes to fan speed. Once the temperature leaves the interval, fan |
cdcaeceb GR |
201 | speed increases (if temperature is higher that desired) or decreases (if |
202 | temperature is lower than desired), using the following limits and time | |
203 | intervals. | |
204 | ||
b32570a4 MCC |
205 | pwm[1-7]_start |
206 | fan pwm start value (range 1 - 255), to start fan | |
cdcaeceb | 207 | when the temperature is above defined range. |
b32570a4 MCC |
208 | |
209 | pwm[1-7]_floor | |
210 | lowest fan pwm (range 0 - 255) if temperature is below | |
cdcaeceb GR |
211 | the defined range. If set to 0, the fan is expected to |
212 | stop if the temperature is below the defined range. | |
b32570a4 MCC |
213 | |
214 | pwm[1-7]_step_up_time | |
215 | milliseconds before fan speed is increased | |
216 | ||
217 | pwm[1-7]_step_down_time | |
218 | milliseconds before fan speed is decreased | |
219 | ||
220 | pwm[1-7]_stop_time | |
221 | how many milliseconds must elapse to switch | |
cdcaeceb GR |
222 | corresponding fan off (when the temperature was below |
223 | defined range). | |
224 | ||
225 | Speed Cruise mode (3) | |
226 | --------------------- | |
227 | ||
228 | This modes tries to keep the fan speed constant. | |
229 | ||
b32570a4 MCC |
230 | fan[1-7]_target |
231 | Target fan speed | |
232 | ||
81820059 | 233 | fan[1-7]_tolerance |
cdcaeceb GR |
234 | Target speed tolerance |
235 | ||
236 | ||
237 | Untested; use at your own risk. | |
238 | ||
239 | Smart Fan IV mode (5) | |
240 | --------------------- | |
241 | ||
242 | This mode offers multiple slopes to control the fan speed. The slopes can be | |
243 | controlled by setting the pwm and temperature attributes. When the temperature | |
244 | rises, the chip will calculate the DC/PWM output based on the current slope. | |
245 | There are up to seven data points depending on the chip type. Subsequent data | |
246 | points should be set to higher temperatures and higher pwm values to achieve | |
247 | higher fan speeds with increasing temperature. The last data point reflects | |
248 | critical temperature mode, in which the fans should run at full speed. | |
249 | ||
81820059 | 250 | pwm[1-7]_auto_point[1-7]_pwm |
cdcaeceb GR |
251 | pwm value to be set if temperature reaches matching |
252 | temperature range. | |
b32570a4 | 253 | |
81820059 | 254 | pwm[1-7]_auto_point[1-7]_temp |
cdcaeceb | 255 | Temperature over which the matching pwm is enabled. |
b32570a4 | 256 | |
81820059 | 257 | pwm[1-7]_temp_tolerance |
cdcaeceb | 258 | Temperature tolerance, unit millidegree Celsius |
b32570a4 | 259 | |
81820059 | 260 | pwm[1-7]_crit_temp_tolerance |
cdcaeceb GR |
261 | Temperature tolerance for critical temperature, |
262 | unit millidegree Celsius | |
263 | ||
b32570a4 MCC |
264 | pwm[1-7]_step_up_time |
265 | milliseconds before fan speed is increased | |
266 | ||
267 | pwm[1-7]_step_down_time | |
268 | milliseconds before fan speed is decreased | |
cdcaeceb | 269 | |
9de2e2e8 GR |
270 | Usage Notes |
271 | ----------- | |
272 | ||
273 | On various ASUS boards with NCT6776F, it appears that CPUTIN is not really | |
274 | connected to anything and floats, or that it is connected to some non-standard | |
275 | temperature measurement device. As a result, the temperature reported on CPUTIN | |
276 | will not reflect a usable value. It often reports unreasonably high | |
277 | temperatures, and in some cases the reported temperature declines if the actual | |
278 | temperature increases (similar to the raw PECI temperature value - see PECI | |
279 | specification for details). CPUTIN should therefore be be ignored on ASUS | |
280 | boards. The CPU temperature on ASUS boards is reported from PECI 0. |