linux/drivers/hwmon
Guenter Roeck 2e23607e65 hwmon: (max31790) Fix pwmX_enable attributes
[ Upstream commit 148c847c9e5a54b99850617bf9c143af9a344f92 ]

pwmX_enable supports three possible values:

0: Fan control disabled. Duty cycle is fixed to 0%
1: Fan control enabled, pwm mode. Duty cycle is determined by
   values written into Target Duty Cycle registers.
2: Fan control enabled, rpm mode
   Duty cycle is adjusted such that fan speed matches
   the values in Target Count registers

The current code does not do this; instead, it mixes pwm control
configuration with fan speed monitoring configuration. Worse, it
reports that pwm control would be disabled (pwmX_enable==0) when
it is in fact enabled in pwm mode. Part of the problem may be that
the chip sets the "TACH input enable" bit on its own whenever the
mode bit is set to RPM mode, but that doesn't mean that "TACH input
enable" accurately reflects the pwm mode.

Fix it up and only handle pwm control with the pwmX_enable attributes.
In the documentation, clarify that disabling pwm control (pwmX_enable=0)
sets the pwm duty cycle to 0%. In the code, explain why TACH_INPUT_EN
is set together with RPM_MODE.

While at it, only update the configuration register if the configuration
has changed, and only update the cached configuration if updating the
chip configuration was successful.

Cc: Jan Kundrát <jan.kundrat@cesnet.cz>
Cc: Václav Kubernát <kubernat@cesnet.cz>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Václav Kubernát <kubernat@cesnet.cz>
Reviewed-by: Jan Kundrát <jan.kundrat@cesnet.cz>
Link: https://lore.kernel.org/r/20210526154022.3223012-4-linux@roeck-us.net
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-07-14 16:53:14 +02:00
..
occ hwmon: (occ) Fix poll rate limiting 2021-05-19 10:08:30 +02:00
pmbus hwmon: (pmbus/max34440) Fix status register reads for MAX344{51,60,61} 2020-10-29 09:57:32 +01:00
Kconfig Main MIPS changes for v5.4: 2019-09-22 09:30:30 -07:00
Makefile Main MIPS changes for v5.4: 2019-09-22 09:30:30 -07:00
ab8500.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 197 2019-05-30 11:29:22 -07:00
abituguru.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
abituguru3.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
abx500.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 197 2019-05-30 11:29:22 -07:00
abx500.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 197 2019-05-30 11:29:22 -07:00
acpi_power_meter.c hwmon: (acpi_power_meter) Fix potential memory leak in acpi_power_meter_add() 2020-07-09 09:37:53 +02:00
ad7314.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 149 2019-05-30 11:25:18 -07:00
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adm1026.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
adm1029.c hwmon: Convert remaining drivers to use SPDX identifier 2019-06-23 18:34:11 -07:00
adm1031.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
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adt7x10.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
adt7x10.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
adt7310.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 149 2019-05-30 11:25:18 -07:00
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adt7411.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
adt7462.c hwmon: (adt7462) Fix an error return in ADT7462_REG_VOLT() 2020-03-12 13:00:30 +01:00
adt7470.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
adt7475.c hwmon: (adt7475) Make volt2reg return same reg as reg2volt input 2020-01-29 16:45:24 +01:00
amc6821.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
applesmc.c hwmon: (applesmc) check status earlier. 2020-09-09 19:12:20 +02:00
as370-hwmon.c hwmon: (as370-hwmon) fix devm_platform_ioremap_resource.cocci warnings 2019-09-03 12:47:17 -07:00
asb100.c hwmon: (asb100) convert to i2c_new_dummy_device 2019-09-03 12:47:17 -07:00
asc7621.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
aspeed-pwm-tacho.c hwmon: (aspeed-pwm-tacho) Avoid possible buffer overflow 2020-07-29 10:18:37 +02:00
asus_atk0110.c hwmon: (asus_atk0110) no need to check return value of debugfs_create functions 2019-06-23 18:33:01 -07:00
atxp1.c docs: i2c: convert to ReST and add to driver-api bookset 2019-07-31 13:25:27 -06:00
coretemp.c hwmon (coretemp) Fix a memory leak bug 2019-08-31 08:04:57 -07:00
da9052-hwmon.c hwmon: (da9052) Synchronize access with mfd 2020-05-20 08:20:26 +02:00
da9055-hwmon.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
dell-smm-hwmon.c hwmon: (dell-smm-hwmon) Fix index values 2021-06-10 13:37:02 +02:00
dme1737.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
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emc1403.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167 2019-05-30 11:26:39 -07:00
emc2103.c hwmon: (emc2103) fix unable to change fan pwm1_enable attribute 2020-07-22 09:33:14 +02:00
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fam15h_power.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 56 2019-05-24 17:36:43 +02:00
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gl520sm.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
gpio-fan.c hwmon: (gpio-fan) fix sysfs notifications and udev events for gpio-fan alarms 2019-07-08 18:11:32 -07:00
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hwmon.c hwmon: (core) Do not use device managed functions for memory allocations 2020-01-29 16:45:24 +01:00
i5k_amb.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
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ibmpowernv.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 114 2019-05-24 17:39:01 +02:00
iio_hwmon.c hwmon: (iio_hwmon) Enable power exporting from IIO 2019-09-03 12:47:17 -07:00
ina2xx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441 2019-06-05 17:37:17 +02:00
ina209.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441 2019-06-05 17:37:17 +02:00
ina3221.c hwmon: (ina3221) Fix PM usage counter unbalance in ina3221_write_enable 2020-12-30 11:51:17 +01:00
it87.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
jc42.c hwmon: (jc42) Fix name to have no illegal characters 2020-05-02 08:48:59 +02:00
k8temp.c hwmon: (k8temp) update to use new hwmon registration API 2019-09-03 12:47:17 -07:00
k10temp.c hwmon: (k10temp) Add AMD family 17h model 60h PCI match 2020-06-22 09:31:19 +02:00
lineage-pem.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
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lm75.c hwmon: (lm75) Aproximate sample times to data-sheet values 2019-09-04 11:06:47 -07:00
lm75.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
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lm80.c Revert "hwmon: (lm80) fix a missing check of bus read in lm80 probe" 2021-05-26 12:05:18 +02:00
lm83.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
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lm87.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
lm90.c hwmon: (lm90) Introduce function to update configuration register 2019-07-08 18:11:31 -07:00
lm92.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
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lochnagar-hwmon.c hwmon: lochnagar: Add Lochnagar 2 hardware monitoring driver 2019-04-15 17:19:53 -07:00
ltc2945.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
ltc2990.c hwmon/ltc2990: Generalise DT to fwnode support 2019-09-03 12:47:17 -07:00
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max6650.c hwmon: (max6650) Fix unused variable warning 2019-06-23 18:33:01 -07:00
max6697.c hwmon: (max6697) Make sure the OVERT mask is set correctly 2020-07-09 09:37:53 +02:00
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max31722.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 330 2019-06-05 17:37:06 +02:00
max31790.c hwmon: (max31790) Fix pwmX_enable attributes 2021-07-14 16:53:14 +02:00
mc13783-adc.c hwmon: (mc13783-adc) Use permission specific SENSOR[_DEVICE]_ATTR variants 2019-02-18 14:23:29 -08:00
mcp3021.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
menf21bmc_hwmon.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
mlxreg-fan.c Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal 2019-05-16 07:56:57 -07:00
nct6683.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
nct6775.c hwmon: (nct6775) Accept PECI Calibration as temperature source for NCT6798D 2020-07-29 10:18:39 +02:00
nct7802.c hwmon: (nct7802) Fix non-working alarm on voltages 2020-01-29 16:45:30 +01:00
nct7904.c hwmon: (nct7904) Correct divide by 0 2020-09-03 11:26:54 +02:00
npcm750-pwm-fan.c hwmon: (npcm750-pwm-fan) Remove dev_err() usage after platform_get_irq() 2019-09-03 12:47:17 -07:00
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pwm-fan.c hwmon: (pwm-fan) Ensure that calculation doesn't discard big period values 2021-01-19 18:26:15 +01:00
raspberrypi-hwmon.c hwmon: (raspberrypi) update MODULE_AUTHOR() email address 2019-09-03 12:47:17 -07:00
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scmi-hwmon.c hwmon: (scmi) Fix potential buffer overflow in scmi_hwmon_probe() 2020-07-29 10:18:39 +02:00
scpi-hwmon.c hwmon: (scpi-hwmon) shows the negative temperature properly 2021-06-23 14:41:27 +02:00
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sht15.c docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
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shtc1.c hwmon: (shtc1) add support for the SHTC3 sensor 2019-09-10 11:42:56 -07:00
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smm665.c It's a somewhat calmer cycle for docs this time, as the churn of the mass 2019-09-17 16:22:26 -07:00
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smsc47m1.c hwmon: (smsc47m1) fix (suspicious) outside array bounds warnings 2019-06-23 18:33:01 -07:00
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