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Drop PWM support for as99127f. Update AS99127F docs.

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git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@2428 7894878c-1315-0410-8ee3-d5d059ff63e0
This commit is contained in:
Jean Delvare
2004-04-09 18:50:43 +00:00
parent 2cdac4e54a
commit bcfb34bcb7
3 changed files with 63 additions and 23 deletions
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2
doc/chips/SUMMARY
View File

@@ -182,7 +182,7 @@ w83627hf
w83697hf 2 8 2 2 pwm no yes (LPC)
w83781d
as99127f 3 7 3 2 pwm? yes no
as99127f 3 7 3 - yes no
w83781d 3 7 3 - yes yes
w83782d 3 9 3 2-4 pwm yes yes
w83783s 1-2 5-6 3 2 pwm yes no

65
doc/chips/w83781d
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@@ -188,7 +188,8 @@ Known problems:
AS99127F PROBLEMS
-----------------
The as99127f support was developed without the benefit of a datasheet.
In most cases it is treated as a w83781d.
In most cases it is treated as a w83781d (although revision 2 of the
AS9917F looks more like a w83782d).
This support will be BETA until a datasheet is released.
One user has reported problems with fans stopping
occasionally.
@@ -199,13 +200,9 @@ disable, not enable. This may be changed in the future.
Known problems:
- Problems with diode/thermistor settings (supported?)
- fan_div register may not really be fan_div.
- One user reports fans stopping under high server load.
- Some as99127f chips are misidentified as a w83781d or w83782d.
This is caused by the chip having the wrong WCHIPID register
value, so there is no fix. The workaround is to use the
force_as99127f parameter.
(modprobe w83781d force_as99127f=BUS,0x2d where BUS is your i2c bus number)
- Revision 2 seems to have 2 PWM registers but we don't know
how to handle them. More details below.
These will not be fixed unless we get a datasheet.
If you have problems, please lobby Asus to release a datasheet.
@@ -524,13 +521,13 @@ See the lm78 documentation for details.
Additional entries not in the lm78:
pwm[1-4]: (not on w83781d)
pwm[1-4]: (not on w83781d nor as99127f)
Controls the speed of the fans with PWM (Pulse Width Modulation)
Valid values:
0 - 255. 255 = max speed.
Second value is PWM enable 0/1.
sensor[1-3]: (not on w83781d)
sensor[1-3]: (not on w83781d nor as99127f)
Controls the sensor type. To change to a different
sensor type, for example, do 'echo 2 > sensor1'.
Valid values:
@@ -541,7 +538,7 @@ Additional entries not in the lm78:
Thermistors with other Betas could in theory be supported
after correspondence with Winbond. See below.
rt[1-3]: (781d only)
rt[1-3]: (w83781d only)
32-byte tables controlling the conversion from
resistance to temperature for thermistors.
For the curious only. Writing to these entries will
@@ -580,8 +577,6 @@ NOTES:
Data sheet updates:
------------------
- Mask off lower bit of all ID registers.
- PWM clock registers:
000: master / 512
@@ -739,3 +734,49 @@ in3=r(0x23)*0.016*1.68
in4=r(0x24)*0.016*4
in5=255
in6=255
# PWM
Additional info about PWM on the AS99127F (may apply to other Asus
chips as well) by Jean Delvare as of 2004-04-09:
AS99127F revision 2 seems to have two PWM registers at 0x59 and 0x5A,
and a temperature sensor type selector at 0x5B (which basically means
that they swapped registers 0x59 and 0x5B when you compare with Winbond
chips).
Revision 1 of the chip also has the temperature sensor type selector at
0x5B, but PWM registers have no effect.
We don't know exactly how the temperature sensor type selection works.
Looks like bits 1-0 are for temp1, bits 3-2 for temp2 and bits 5-4 for
temp3, although it is possible that only the most significant bit matters
each time. So far, values other than 0 always broke the readings.
PWM registers seem to be split in two parts: bit 7 is a mode selector,
while the other bits seem to define a value or threshold.
When bit 7 is clear, bits 6-0 seem to hold a threshold value. If the value
is below a given limit, the fan runs at low speed. If the value is above
the limit, the fan runs at full speed. We have no clue as to what the limit
represents. Note that there seem to be some inertia in this mode, speed
changes may need some time to trigger. Also, an hysteresis mechanism is
suspected since walking through all the values increasingly and then
decreasingly led to slighlty different limits.
When bit 7 is set, bits 3-0 seem to hold a threshold value, while bits 6-4
would not be significant. If the value is below a given limit, the fan runs
at full speed, while if it is above the limit it runs at low speed (so this
is the contrary of the other mode, in a way). Here again, we don't know
what the limit is supposed to represent.
One remarkable thing is that the fans would only have two or three
different speeds (transitional states left apart), not a whole range as
you usually get with PWM.
As a conclusion, you can write 0x00 or 0x8F to the PWM registers to make
fans run at low speed, and 0x7F or 0x80 to make them run at full speed.
Please contact us if you can figure out how it is supposed to work. As
long as we don't know more, the w83781d driver doesn't handle PWM on
AS99127F chips at all.

19
kernel/chips/w83781d.c
View File

@@ -24,7 +24,7 @@
Supports following chips:
Chip #vin #fanin #pwm #temp wchipid vendid i2c ISA
as99127f 7 3 1? 3 0x31 0x12c3 yes no
as99127f 7 3 0 3 0x31 0x12c3 yes no
as99127f rev.2 (type name = as99127f) 0x31 0x5ca3 yes no
w83627hf 9 3 2 3 0x21 0x5ca3 yes yes(LPC)
w83697hf 8 2 2 2 0x60 0x5ca3 no yes(LPC)
@@ -442,10 +442,6 @@ static ctl_table as99127f_dir_table_template[] = {
&i2c_sysctl_real, NULL, &w83781d_alarms},
{W83781D_SYSCTL_BEEP, "beep", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &w83781d_beep},
{W83781D_SYSCTL_PWM1, "pwm1", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &w83781d_pwm},
{W83781D_SYSCTL_PWM2, "pwm2", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &w83781d_pwm},
{0}
};
@@ -1062,6 +1058,10 @@ static int w83781d_detect(struct i2c_adapter *adapter, int address,
}
data->sysctl_id = i;
/* Only PWM2 can be disabled */
for(i = 0; i < 4; i++)
data->pwmenable[i] = 1;
/* Initialize the chip */
w83781d_init_client(new_client);
return 0;
@@ -1379,9 +1379,6 @@ static void w83781d_init_client(struct i2c_client *client)
if (!(i & 0x40))
w83781d_write_value(client, W83781D_REG_IRQ,
i | 0x40);
for(i = 0; i < 3; i++)
data->pwmenable[i] = 1;
}
}
@@ -1442,20 +1439,22 @@ static void w83781d_update_client(struct i2c_client *client)
W83781D_REG_FAN_MIN(i));
if (data->type != w83791d && i == 3) break;
}
if (data->type != w83781d) {
if (data->type != w83781d && data->type != as99127f) {
for (i = 1; i <= 4; i++) {
data->pwm[i - 1] =
w83781d_read_value(client,
W83781D_REG_PWM(data->type, i));
if (((data->type == w83783s)
|| (data->type == w83627hf)
|| (data->type == as99127f)
|| (data->type == w83697hf)
|| ((data->type == w83782d)
&& i2c_is_isa_client(client)))
&& i == 2)
break;
}
/* Only PWM2 can be disabled */
data->pwmenable[1] = (w83781d_read_value(client,
W83781D_REG_PWMCLK12) & 0x08) >> 3;
}
data->temp = w83781d_read_value(client, W83781D_REG_TEMP);