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Andrew Jeffery d206636e76 hwmon: (pmbus) Add fan control support 
Expose fanX_target, pwmX and pwmX_enable hwmon sysfs attributes.

Fans in a PMBus device are driven by the configuration of two registers,
FAN_CONFIG_x_y and FAN_COMMAND_x: FAN_CONFIG_x_y dictates how the fan
and the tacho operate (if installed), while FAN_COMMAND_x sets the
desired fan rate. The unit of FAN_COMMAND_x is dependent on the
operational fan mode, RPM or PWM percent duty, as determined by the
corresponding configuration in FAN_CONFIG_x_y.

The mapping of fanX_target, pwmX and pwmX_enable onto FAN_CONFIG_x_y and
FAN_COMMAND_x is implemented with the addition of virtual registers to
facilitate the necessary side-effects of each access:

1. PMBUS_VIRT_FAN_TARGET_x
2. PMBUS_VIRT_PWM_x
3. PMBUS_VIRT_PWM_ENABLE_x

Some complexity arises with the fanX_target and pwmX attributes both mapping
onto FAN_COMMAND_x: There is no general mapping between PWM percent duty and
RPM, so we can't display values in either attribute in terms of the other
(which in my mind is the intuitive, if impossible, behaviour). This problem
also affects the pwmX_enable attribute which allows userspace to switch between
full speed, manual PWM and a number of automatic control modes, possibly
including a switch to RPM behaviour (e.g. automatically adjusting PWM duty to
reach a RPM target, the behaviour of fanX_target).

The next most intuitive behaviour is for fanX_target and pwmX to simply be
independent, to retain their most recently set value even if that value is not
active on the hardware (due to switching to the alternative control mode). This
property of retaining the value independent of the hardware state has useful
results for both userspace and the kernel: Userspace always sees a sensible
value in the attribute (the last thing it was set to, as opposed to 0 or
receiving an error on read), and the kernel can use the attributes as a value
cache. This latter point eases the implementation of pwmX_enable, which can
look up the associated pmbus_sensor object, take its cached value and apply it
to hardware on changing control mode. This ensures we will not arbitrarily set
a PWM value as an RPM value or vice versa, and we can assume that the RPM or
PWM value set was sensible at least at some point in the past.

Finally, the DIRECT mode coefficients of some controllers is different between
RPM and PWM percent duty control modes, so PSC_PWM is introduced to capture the
necessary coefficients. As pmbus core had no PWM support previously PSC_FAN
continues to be used to capture the RPM DIRECT coefficients, but in order to
avoid falsely applying RPM scaling to PWM values I have introduced the
PMBUS_HAVE_PWM12 and PMB_BUS_HAVE_PWM34 feature bits. These feature bits allow
drivers to explicitly declare PWM support in order to have the attributes
exposed.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2018-01-02 15:05:34 -08:00
..
pmbus hwmon: (pmbus) Add fan control support 2018-01-02 15:05:34 -08:00
ab8500.c
abituguru.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
abituguru3.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
abx500.c hwmon: (abx500) drop the use of IRQF_NO_SUSPEND 2015-10-14 07:57:14 -07:00
abx500.h
acpi_power_meter.c dmi: Mark all struct dmi_system_id instances const 2017-09-14 11:59:30 +02:00
ad7314.c hwmon: (ad7314) Convert to devm_hwmon_device_register_with_groups 2016-06-27 18:58:03 -07:00
ad7414.c hwmon: (ad7414) Add OF device ID table 2017-04-02 07:01:53 -07:00
ad7418.c
adc128d818.c hwmon: (adc128d818) constify attribute_group structures. 2017-08-13 08:24:38 -07:00
adcxx.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
adm1021.c hwmon: (adm1021) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
adm1025.c hwmon: (adm1025) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
adm1026.c hwmon: (adm1026) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
adm1029.c
adm1031.c hwmon: (adm1031) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
adm9240.c hwmon: (adm9240) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
ads1015.c hwmon: (ads1015) Convert to using %pOF instead of full_name 2017-08-13 08:24:38 -07:00
ads7828.c hwmon: (ads7828) Accept optional parameters from device tree 2017-04-02 07:01:53 -07:00
ads7871.c hwmon: (ads7871) Convert to devm_hwmon_device_register_with_groups 2016-06-27 18:58:03 -07:00
adt7x10.c hwmon: (adt7x10) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
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 spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
adt7410.c
adt7411.c hwmon: (adt7411) add min, max and alarm attributes 2017-01-02 10:19:45 -08:00
adt7462.c hwmon: (adt7462) Fix overflows seen when writing into limit attributes 2016-12-09 21:54:31 -08:00
adt7470.c hwmon: (adt7470) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
adt7475.c hwmon: (adt7475) constify attribute_group structures. 2017-08-13 08:24:38 -07:00
amc6821.c hwmon: (amc6821) sign extension temperature 2016-12-02 13:28:04 -08:00
applesmc.c dmi: Mark all struct dmi_system_id instances const 2017-09-14 11:59:30 +02:00
asb100.c hwmon: (asb100) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
asc7621.c hwmon: (asc7621) remove redundant assignment to newval 2017-10-29 18:36:03 -07:00
aspeed-pwm-tacho.c hwmon: (aspeed-pwm-tacho) Sort headers 2017-11-04 11:09:34 -07:00
asus_atk0110.c hwmon: (asus_atk0110) fix uninitialized data access 2017-03-23 12:01:57 -07:00
atxp1.c hwmon: (atxp1) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
coretemp.c hwmon: (coretemp) deprecate pci_get_bus_and_slot() 2018-01-02 15:05:34 -08:00
da9052-hwmon.c hwmon: (da9052) Increase sample rate when using TSI 2017-10-21 09:03:29 -07:00
da9055-hwmon.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
dell-smm-hwmon.c dmi: Mark all struct dmi_system_id instances const 2017-09-14 11:59:30 +02:00
dme1737.c hwmon: (dme1737) Fix overflows seen when writing into limit attributes 2017-01-10 08:57:55 -08:00
ds620.c hwmon: (ds620) move header file out of I2C realm 2017-06-11 17:08:19 -07:00
ds1621.c hwmon: (ds1621) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
emc6w201.c hwmon: (emcw201) Fix overflows seen when writing into limit attributes 2016-12-12 11:33:44 -08:00
emc1403.c
emc2103.c hwmon: (emc2103) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
f71805f.c hwmon: (f71805f) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
f71882fg.c hwmon: (f71882fg) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
f75375s.c
fam15h_power.c hwmon: (fam15h_power) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
fschmd.c hwmon: (fschmd) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
ftsteutates.c hwmon: (ftsteutates) constify i2c_device_id 2017-08-29 17:44:23 -07:00
g760a.c hwmon: (g760a) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
g762.c scripts/spelling.txt: add "followings" pattern and fix typo instances 2017-02-27 18:43:47 -08:00
gl518sm.c hwmon: (gl518sm) Fix overflows seen when writing into limit attributes 2017-01-10 08:58:36 -08:00
gl520sm.c hwmon: (gl520sm) Fix overflows and crash seen when writing into limit attributes 2017-01-10 08:59:35 -08:00
gpio-fan.c hwmon: (gpio-fan) Fix null pointer dereference at probe 2017-10-29 18:36:03 -07:00
hih6130.c
hwmon-vid.c
hwmon.c hwmon: Deal with errors from the thermal subsystem 2017-12-26 11:53:24 -08:00
i5k_amb.c hwmon: (i5k_amb) constify pci_device_id 2017-08-13 08:24:38 -07:00
i5500_temp.c hwmon: (i5500_temp) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
ibmaem.c hwmon: (ibmaem) constify aem_rw_sensor_template and aem_ro_sensor_template structures 2016-01-04 08:56:22 -08:00
ibmpex.c hwmon: (ibmpex) Allow format string checking 2015-03-09 09:59:35 -07:00
ibmpowernv.c hwmon: (ibmpowernv) Add current(A) sensor 2017-06-20 13:52:19 -07:00
iio_hwmon.c hwmon: (iio_hwmon) defer probe when no channel is found 2016-09-08 21:34:17 -07:00
ina2xx.c hwmon: (ina2xx) Add OF device ID table 2017-04-02 07:01:53 -07:00
ina209.c hwmon: (ina209) Handled signed registers 2017-04-21 12:30:09 -07:00
ina3221.c hwmon: (ina3221) Fix negative limits 2016-06-27 18:58:04 -07:00
it87.c hwmon: (it87) Reapply probe path chip registers settings after resume 2017-08-13 08:24:38 -07:00
jc42.c hwmon: (jc42) optionally try to disable the SMBUS timeout 2017-11-30 13:12:44 -08:00
jz4740-hwmon.c hwmon: (jz4740) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
k8temp.c hwmon: (k8temp) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
k10temp.c hwmon: (k10temp) Correct model name for Ryzen 1600X 2017-11-16 00:59:45 -08:00
Kconfig hwmon: Drop unnecessary 'default n' from Kconfig 2018-01-02 15:05:34 -08:00
lineage-pem.c
lm63.c hwmon: (lm63) Add OF device ID table 2017-04-02 07:01:53 -07:00
lm70.c hwmon: (lm70) Add support for TI TMP122/124 2017-01-21 12:26:38 -08:00
lm73.c
lm75.c hwmon: (lm75) Add OF device ID table 2017-04-02 07:01:53 -07:00
lm75.h
lm77.c
lm78.c hwmon: (lm78) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
lm80.c hwmon: (lm80) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
lm83.c hwmon: (lm83) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
lm85.c hwmon: (lm85) Add OF device ID table 2017-04-02 07:01:53 -07:00
lm87.c hwmon: (lm87) Add OF device ID table 2017-04-13 06:09:26 -07:00
lm90.c hwmon: (lm90) Add OF device ID table 2017-04-02 07:01:53 -07:00
lm92.c hwmon: (lm92) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
lm93.c hwmon: (lm93) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
lm95234.c hwmon: (lm95234) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
lm95241.c hwmon: (lm95241) Update module description to include LM95231 2016-09-13 07:28:01 -07:00
lm95245.c hwmon: (lm95245) Add OF device ID table 2017-04-02 07:01:53 -07:00
ltc2945.c
ltc2990.c hwmon: Add LTC2990 sensor driver 2016-03-05 06:25:34 -08:00
ltc4151.c hwmon: (ltc4151) Export OF device ID table as module aliases 2017-01-21 08:57:41 -08:00
ltc4215.c
ltc4222.c
ltc4245.c hwmon: (ltc4245) move header file out of I2C realm 2017-06-11 17:08:19 -07:00
ltc4260.c
ltc4261.c
ltq-cputemp.c hwmon: (ltq-cputemp) add cpu temp sensor driver 2017-09-01 07:24:14 -07:00
Makefile hwmon: Add W83773G driver 2018-01-02 15:05:34 -08:00
max197.c hwmon: (max197) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
max1111.c hwmon: (max1111) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
max1619.c hwmon: (max1619) Add dt binding 2017-10-29 18:36:03 -07:00
max1668.c
max6621.c hwmon: (max6621) Inverted if condition in max6621_read() 2017-10-29 18:36:03 -07:00
max6639.c hwmon: (max6639) move header file out of I2C realm 2017-06-11 17:08:19 -07:00
max6642.c
max6650.c hwmon: (max6650) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
max6697.c hwmon: (max6697) Add OF device ID table 2017-04-02 07:01:53 -07:00
max16065.c
max31722.c hwmon: (max31722) Add support for MAX31722/MAX31723 temperature sensors 2016-04-19 06:32:34 -07:00
max31790.c hwmon: (max31790) Set correct PWM value 2017-03-22 00:18:20 -07:00
mc13783-adc.c hwmon: (mc13783-adc) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
mcp3021.c hwmon: (mcp3021) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
menf21bmc_hwmon.c Merge branch 'platform/remove_owner' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux into driver-core-next 2014-11-03 19:53:56 -08:00
nct6683.c hwmon: (nct6683) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
nct6775.c hwmon: (nct6775) Add support for NCT6795D 2017-06-11 17:08:19 -07:00
nct7802.c hwmon: (nct7802) constify attribute_group structures. 2017-08-13 08:24:38 -07:00
nct7904.c hwmon: (nct7904) Convert to use new hwmon registration API 2016-09-08 21:34:18 -07:00
nsa320-hwmon.c hwmon: (nsa320) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
ntc_thermistor.c hwmon: (ntc_thermistor) Use devm_hwmon_device_register_with_groups 2016-09-08 21:34:15 -07:00
pc87360.c hwmon: (pc87360) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
pc87427.c hwmon: (pc87427) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
pcf8591.c hwmon: (pcf8591) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
powr1220.c
pwm-fan.c hwmon: (pwm-fan) Switch to new atomic PWM API 2017-06-11 17:08:19 -07:00
s3c-hwmon.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
sch56xx-common.c hwmon: (sch56xx) Remove unneeded linux/miscdevice.h include 2017-01-02 10:19:45 -08:00
sch56xx-common.h
sch5627.c hwmon: (sch5627) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
sch5636.c hwmon: (sch5636) trivial fix of spelling mistake on revision 2016-04-25 07:26:29 -07:00
scpi-hwmon.c hwmon: (scpi) constify thermal_zone_of_device_ops structures 2017-08-13 08:24:38 -07:00
sht3x.c hwmon: (sht3x) set initial jiffies to last_update 2016-07-31 14:56:36 -07:00
sht15.c hwmon: (sht15) remove redundant check on status and send of status value 2017-10-29 18:36:03 -07:00
sht21.c hwmon: (sht21) Add Electronic Identification Code retrieval 2017-01-02 10:19:45 -08:00
shtc1.c
sis5595.c hwmon: (sis5595) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
smm665.c
smsc47b397.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
smsc47m1.c hwmon: (smsc47m1) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
smsc47m192.c hwmon: (smsc47m192) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
stts751.c hwmon: (stts751) Fix buffer size passed to snprintf 2017-10-29 18:36:03 -07:00
tc74.c hwmon: add driver for Microchip TC74 2015-06-21 22:54:53 -07:00
tc654.c hwmon: Add tc654 driver 2016-12-02 13:28:05 -08:00
thmc50.c
tmp102.c hwmon: (tmp102) Fix first temperature reading 2017-10-24 06:17:14 -07:00
tmp103.c hwmon: (tmp103) Use SIMPLE_DEV_PM_OPS helper macro 2017-04-24 06:30:41 -07:00
tmp108.c hwmon: Add Texas Instruments TMP108 temperature sensor driver. 2016-12-09 21:54:25 -08:00
tmp401.c hwmon: (tmp401) use smb word operations instead of 2 smb byte operations 2017-01-10 09:01:32 -08:00
tmp421.c hwmon: (tmp421) Add OF device ID table 2017-04-02 07:01:53 -07:00
ultra45_env.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
vexpress-hwmon.c hwmon: (vexpress) rename vexpress hwmon implementation 2016-03-05 06:25:33 -08:00
via-cputemp.c hwmon: (via-cputemp) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
via686a.c hwmon: (via686a) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
vt1211.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
vt8231.c hwmon: (vt8231) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
w83l785ts.c
w83l786ng.c
w83627ehf.c hwmon: (w83627ehf) Use request_muxed_region 2017-04-02 07:01:53 -07:00
w83627hf.c hwmon: (w83627hf) use permission-specific DEVICE_ATTR variants 2017-01-02 10:19:45 -08:00
w83773g.c hwmon: Add W83773G driver 2018-01-02 15:05:34 -08:00
w83781d.c hwmon: (w83781d) Remove duplicate NULL check 2017-11-16 01:01:55 -08:00
w83791d.c hwmon: (w83791d) Remove duplicate NULL check 2017-11-16 01:02:23 -08:00
w83792d.c hwmon: (w83792d) Remove duplicate NULL check 2017-11-16 01:02:43 -08:00
w83793.c hwmon: (w83793) Remove duplicate NULL check 2017-11-16 01:03:19 -08:00
w83795.c hwmon: (w83795) use find_closest_descending() in pwm_freq_to_reg() 2015-04-17 09:03:55 -04:00
wm831x-hwmon.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
wm8350-hwmon.c hwmon: drop owner assignment from platform_drivers 2014-10-20 16:20:36 +02:00
xgene-hwmon.c hwmon: (xgene) Minor clean up of ifdef and acpi_match_table reference 2017-11-01 06:14:52 -07:00