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Srinivas Pandruvada d19e470b66 ACPI: fan: Expose fan performance state information 
When _FPS indicates variable speed fan support, the thermal cooling
device for fan shows max performance state count as "max_state"
(greater than or equal to 1).

But the thermal cooling device doesn't expose the properties of each
performance state. This is not enough for smart fan control user
space software, which also considers speed, power and noise level.

This change exposes the properties of the fan performance states
in the sysfs directory of the ACPI device representing the fan,
that is

/sys/bus/acpi/devices/devices/INT3404:00

or

/sys/bus/platform/devices/PNP0C0B:00.

For example:

$ ls /sys/bus/acpi/devices/INT3404\:00
description  path           state0   state11  state4  state7  status
hid          physical_node  state1   state2   state5  state8  subsystem
modalias     power          state10  state3   state6  state9  uevent
uid          wakeup

where each state* attribute lists the properties of a fan performance
state in the following format:

control_percent:trip_point:speed_rpm:noise_level_mdb:power_mw

$ cat /sys/bus/acpi/devices/INT3404\:00/state10
95:0:11600:47500:4500

as documented in

Documentation/admin-guide/acpi/fan_performance_states.rst

While at it, return the correct error code from acpi_fan_probe()
when acpi_fan_get_fps() or acpi_fan_get_fif() fails.

Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
[ rjw: Subject, changelog, documentation ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-12-19 22:35:04 +01:00
..
accessibility
acpi ACPI: fan: Expose fan performance state information 2019-12-19 22:35:04 +01:00
amba
android binder: fix incorrect calculation for num_valid 2019-12-14 09:10:47 +01:00
ata pci-v5.5-changes 2019-12-03 13:58:22 -08:00
atm
auxdisplay auxdisplay: charlcd: deduplicate simple_strtoul() 2019-12-04 19:44:12 -08:00
base Merge branch 'remove-ksys-mount-dup' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux 2019-12-15 11:36:12 -08:00
bcma
block xen: branch for v5.5-rc2 2019-12-15 12:24:44 -08:00
bluetooth Bluetooth: btbcm: Use the BDADDR_PROPERTY quirk 2019-11-22 13:35:20 +01:00
bus Few ti-sysc related fixes for v5.5 merge window 2019-12-06 08:26:50 -08:00
cdrom cdrom: respect device capabilities during opening action 2019-11-26 13:02:24 -07:00
char drm msm + fixes for 5.5-rc1 2019-12-06 10:28:09 -08:00
clk ARM: SoC platform updates 2019-12-05 11:38:40 -08:00
clocksource Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-12-03 12:20:25 -08:00
connector
counter
cpufreq cpufreq: tegra: Changes for v5.5-rc1 2019-12-06 08:28:13 -08:00
cpuidle cpuidle: Drop unnecessary type cast in cpuidle_poll_time() 2019-12-12 17:56:08 +01:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2019-12-02 17:23:21 -08:00
dax libnvdimm for 5.5 2019-12-01 18:43:25 -08:00
dca
devfreq PM / devfreq: Use PM QoS for sysfs min/max_freq 2019-12-09 12:19:16 +09:00
dio
dma dmaengine: Fix Kconfig indentation 2019-11-22 11:16:26 +05:30
dma-buf - A fix for a memory leak in the dma-buf support 2019-12-09 17:13:19 +10:00
edac EDAC/altera: Use the Altera System Manager driver 2019-11-22 10:18:29 +01:00
eisa
extcon Char/Misc driver patches for 5.5-rc1 2019-11-27 10:53:50 -08:00
firewire FireWire (IEEE 1394) subsystem updates: 2019-12-02 14:13:00 -08:00
firmware treewide: Use sizeof_field() macro 2019-12-09 10:36:44 -08:00
fpga
fsi
gnss
gpio gpio: pca953x: tighten up indentation 2019-12-04 19:44:14 -08:00
gpu Merge tag 'drm-fixes-5.5-2019-12-12' of git://people.freedesktop.org/~agd5f/linux into drm-fixes 2019-12-13 14:50:01 +10:00
greybus
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid 2019-12-01 18:20:54 -08:00
hsi
hv Merge branch 'akpm' (patches from Andrew) 2019-12-01 20:36:41 -08:00
hwmon compat_ioctl: remove most of fs/compat_ioctl.c 2019-12-01 13:46:15 -08:00
hwspinlock
hwtracing compat_ioctl: remove most of fs/compat_ioctl.c 2019-12-01 13:46:15 -08:00
i2c i2c: remove i2c_new_dummy() API 2019-12-10 23:15:09 +01:00
i3c
ide compat_ioctl: remove most of fs/compat_ioctl.c 2019-12-01 13:46:15 -08:00
idle cpuidle: Drop disabled field from struct cpuidle_state 2019-11-29 11:48:39 +01:00
iio First set of fixes for IIO in the 5.5 cycle. 2019-12-09 09:27:52 +01:00
infiniband Pull request for 5.5-rc2 2019-12-15 14:58:13 -08:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2019-12-07 18:33:01 -08:00
interconnect interconnect: qcom: msm8974: Walk the list safely on node removal 2019-12-12 10:28:54 +01:00
iommu pci-v5.5-changes 2019-12-03 13:58:22 -08:00
ipack
irqchip pci-v5.5-changes 2019-12-03 13:58:22 -08:00
isdn compat_ioctl: remove most of fs/compat_ioctl.c 2019-12-01 13:46:15 -08:00
leds Merge tag 'leds-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/pavel/linux-leds 2019-12-01 16:09:28 -08:00
lightnvm
macintosh powerpc updates for 5.5 2019-11-30 14:35:43 -08:00
mailbox mailbox changes for v5.5 2019-12-01 18:42:02 -08:00
mcb
md for-linus-20191212 2019-12-13 14:27:19 -08:00
media treewide: Use sizeof_field() macro 2019-12-09 10:36:44 -08:00
memory memory: tegra: Fixes for v5.5-rc1 2019-12-06 08:28:51 -08:00
memstick pci-v5.5-changes 2019-12-03 13:58:22 -08:00
message
mfd chrome platform changes for v5.5 2019-12-03 14:37:12 -08:00
misc lib/genalloc.c: rename addr_in_gen_pool to gen_pool_has_addr 2019-12-04 19:44:13 -08:00
mmc Driver core patches for 5.5-rc1 2019-11-27 11:06:20 -08:00
mtd TTY/Serial patches for 5.5-rc1 2019-12-03 14:09:14 -08:00
mux
net treewide: Use sizeof_field() macro 2019-12-09 10:36:44 -08:00
nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-11-22 16:27:24 -08:00
ntb Add Hygon Device ID to the AMD NTB device driver 2019-12-07 18:38:17 -08:00
nubus
nvdimm libnvdimm for 5.5 2019-12-01 18:43:25 -08:00
nvme for-linus-20191212 2019-12-13 14:27:19 -08:00
nvmem ARM: SoC-related driver updates 2019-12-05 11:43:31 -08:00
of of/platform: Unconditionally pause/resume sync state during kernel init 2019-12-12 18:39:52 -06:00
opp
oprofile Printk changes for 5.5 2019-11-25 19:40:40 -08:00
parisc
parport
pci PCI: rockchip: Fix IO outbound ATU register number 2019-12-12 15:25:37 -06:00
pcmcia pcmcia: remove unused dprintk definition 2019-11-22 07:03:45 +01:00
perf
phy ARM: SoC-related driver updates 2019-12-05 11:43:31 -08:00
pinctrl Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-12-03 09:29:50 -08:00
platform chrome platform changes for v5.5 2019-12-03 14:37:12 -08:00
pnp
power Additional power management updates for 5.5-rc1 2019-12-04 10:48:09 -08:00
powercap
pps
ps3
ptp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-11-16 21:51:42 -08:00
pwm pwm: Changes for v5.5-rc1 2019-12-05 11:28:14 -08:00
rapidio drivers/rapidio/rio-access.c: fix missing include of <linux/rio_drv.h> 2019-12-04 19:44:13 -08:00
ras
regulator Merge branch 'regulator-5.5' into regulator-next 2019-11-22 19:56:20 +00:00
remoteproc remoteproc: stm32: fix probe error case 2019-11-18 20:35:16 -08:00
reset ARM: SoC-related driver updates 2019-12-05 11:43:31 -08:00
rpmsg rpmsg updates for v5.5 2019-12-01 18:39:24 -08:00
rtc RTC for 5.5 2019-12-03 13:31:08 -08:00
s390 treewide: Use sizeof_field() macro 2019-12-09 10:36:44 -08:00
sbus
scsi SCSI fixes on 20191214 2019-12-14 12:51:57 -08:00
sfi
sh
siox
slimbus
soc ARM: SoC fixes 2019-12-06 14:19:37 -08:00
soundwire
spi Merge branch 'spi-5.5' into spi-next 2019-11-22 19:56:35 +00:00
spmi
ssb
staging Staging/IIO fixes for 5.5-rc2 2019-12-14 12:43:57 -08:00
target treewide: Use sizeof_field() macro 2019-12-09 10:36:44 -08:00
tc
tee Merge mainline/master into arm/fixes 2019-12-05 13:18:54 -08:00
thermal thermal: power_allocator: Fix Kconfig warning 2019-12-07 21:49:06 +08:00
thunderbolt thunderbolt: Power cycle the router if NVM authentication fails 2019-11-19 17:35:57 +01:00
tty TTY/Serial patches for 5.5-rc1 2019-12-03 14:09:14 -08:00
uio
usb USB driver fixes for 5.5-rc2 2019-12-14 12:40:39 -08:00
vfio VFIO updates for v5.5-rc1 2019-12-07 14:51:04 -08:00
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-12-08 13:28:11 -08:00
video pci-v5.5-changes 2019-12-03 13:58:22 -08:00
virt compat_ioctl: remove most of fs/compat_ioctl.c 2019-12-01 13:46:15 -08:00
virtio virtio_balloon: divide/multiply instead of shifts 2019-12-11 08:14:07 -05:00
visorbus
vlynq
vme
w1
watchdog linux-watchdog 5.5-rc1 tag 2019-12-01 18:01:03 -08:00
xen xen: branch for v5.5-rc2 2019-12-15 12:24:44 -08:00
zorro
Kconfig
Makefile