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Rafał Miłecki 0f247626cb usb: core: Introduce a USB port LED trigger 
This commit adds a new trigger responsible for turning on LED when USB
device gets connected to the selected USB port. This can can useful for
various home routers that have USB port(s) and a proper LED telling user
a device is connected.

The trigger gets its documentation file but basically it just requires
enabling it and selecting USB ports (e.g. echo 1 > ports/usb1-1).

There was a long discussion on design of this driver. Its current state
is a result of picking them most adjustable solution as others couldn't
handle all cases.

1) It wasn't possible for the driver to register separated trigger for
   each USB port. Some physical USB ports are handled by more than one
   controller and so by more than one USB port. E.g. USB 2.0 physical
   port may be handled by OHCI's port and EHCI's port.
   It's also not possible to assign more than 1 trigger to a single LED
   and implementing such feature would be tricky due to syncing triggers
   and sysfs conflicts with old triggers.

2) Another idea was to register trigger per USB hub. This wouldn't allow
   handling devices with multiple USB LEDs and controllers (hubs)
   controlling more than 1 physical port. It's common for hubs to have
   few ports and each may have its own LED.

This final trigger is highly flexible. It allows selecting any USB ports
for any LED. It was also modified (comparing to the initial version) to
allow choosing ports rather than having user /guess/ proper names. It
was successfully tested on SmartRG SR400ac which has 3 USB LEDs,
2 physical ports and 3 controllers.

It was noted USB subsystem already has usb-gadget and usb-host triggers
but they are pretty trivial ones. They indicate activity only and can't
have ports specified.

In future it may be good idea to consider adding activity support to
usbport as well. This should allow switching to this more generic driver
and maybe marking old ones as obsolete.
This can be implemented with another sysfs file for setting mode. The
default mode wouldn't change so there won't be ABI breakage and so such
feature can be safely implemented later.

There was also an idea of supporting other devices (PCI, SDIO, etc.) but
as this driver already contains some USB specific code (and will get
more) these should be probably separated drivers (triggers).

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-09-27 12:20:17 +02:00
..
ABI usb: core: Introduce a USB port LED trigger 2016-09-27 12:20:17 +02:00
accounting taskstats: fix nl parsing in accounting/getdelays.c 2016-04-27 12:50:14 -04:00
acpi Merge branches 'acpi-bus', 'acpi-pci', 'acpica' and 'acpi-doc' 2016-07-25 13:41:25 +02:00
aoe
arm bus: arm-ccn: Correct required arguments for XP PMU events 2016-08-17 11:42:40 +01:00
arm64 arm64: Document workaround for Cortex-A72 erratum #853709 2016-08-17 12:23:47 +02:00
auxdisplay
backlight
blackfin
block doc: update block/queue-sysfs.txt entries 2016-08-11 09:37:23 -06:00
blockdev zram: cosmetic: cleanup documentation 2016-07-26 16:19:19 -07:00
bus-devices
cdrom
cgroup-v1 Three fixes for the docs build, including removing an annoying warning on 2016-08-07 10:23:17 -04:00
cma
connector samples: connector: from Documentation to samples directory 2016-04-28 07:47:35 -06:00
console
cpu-freq cpufreq-stats: Minor documentation fix 2016-09-08 23:05:07 +02:00
cpuidle
cris
crypto crypto: doc - Fix typo 2016-05-31 16:41:55 +08:00
development-process docs: deprecate kernel-doc-nano-HOWTO.txt 2016-07-20 16:45:37 -06:00
device-mapper block: rename bio bi_rw to bi_opf 2016-08-07 14:41:02 -06:00
devicetree Merge 4.8-rc7 into usb-next 2016-09-19 09:12:41 +02:00
dmaengine Documentation: dmaengine: fix typo for device_resume 2016-06-03 14:00:21 -06:00
DocBook Three fixes for the docs build, including removing an annoying warning on 2016-08-07 10:23:17 -04:00
driver-model ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
early-userspace
EDID
extcon
fault-injection
fb Documentation: fb: fix spelling mistakes 2016-05-10 12:05:27 +03:00
features powerpc: Add HAVE_PERF_USER_STACK_DUMP support 2016-05-11 21:54:05 +10:00
filesystems ovl: update doc 2016-09-01 11:12:00 +02:00
firmware_class Documentation: fix common spelling mistakes 2016-04-28 07:51:59 -06:00
fmc
fpga
frv
gpio gpio: Fix paths to GPIO driver source files 2016-06-13 09:30:31 +02:00
gpu drm: add generic zpos property 2016-07-29 09:59:30 +02:00
hid HID: add Alps I2C HID Touchpad-Stick support 2016-06-17 23:12:04 +02:00
hwmon hwmon: (ftsteutates) Correct ftp urls in driver documentation 2016-08-12 05:56:34 -07:00
i2c Documentation: i2c: slave-interface: add note for driver development 2016-09-08 16:57:14 +02:00
ia64
ide
iio
infiniband Round two of 4.7 merge window patches 2016-05-28 11:04:16 -07:00
input Input: clarify we want BTN_TOOL_<name> on proximity 2016-04-06 10:23:09 -07:00
ioctl nilfs2: move ioctl interface and disk layout to uapi separately 2016-08-02 19:35:21 -04:00
isdn isdn: i4l: move active-isdn drivers to staging 2016-03-05 15:00:38 -08:00
ja_JP Documentatio: HOWTO: remove regression postings info from translations 2016-04-16 10:49:08 -06:00
kbuild kbuild, x86: Track generated headers with generated-y 2016-07-07 15:58:44 +02:00
kdump kdump: fix dmesg gdbmacro to work with record based printk 2016-06-03 15:06:22 -07:00
ko_KR Documentation: HOWTO: update git home URL in translations 2016-04-16 10:49:18 -06:00
laptops leds: documentation: 'ide-disk' to 'disk-activity' 2016-06-27 08:58:35 +02:00
leds usb: core: Introduce a USB port LED trigger 2016-09-27 12:20:17 +02:00
livepatch Merge branches 'for-4.7/core', 'for-4.7/livepatching-doc' and 'for-4.7/livepatching-ppc64' into for-linus 2016-05-17 12:06:35 +02:00
locking locking/Documentation/lockdep: Fix spelling mistakes 2016-04-28 10:40:57 +02:00
m68k
media [media] cx23885-cardlist.rst: add a new card 2016-07-23 08:14:48 -03:00
memory-devices
metag
mic mpssd: fix buffer overflow warning 2016-06-03 13:31:37 -06:00
mips
misc-devices Merge char-misc-next into staging-next 2016-02-22 14:46:24 -08:00
mmc mmc: core: Extend sysfs with DSR register 2016-07-25 10:34:51 +02:00
mn10300
mtd
namespaces
netlabel
networking Documentation: networking: dsa: Remove platform device TODO 2016-08-28 23:43:06 -04:00
nfc
nios2
nvdimm libnvdimm, btt: update the usage section in Documentation 2016-06-17 16:23:23 -07:00
nvmem
parisc
PCI treewide: remove references to the now unnecessary DEFINE_PCI_DEVICE_TABLE 2016-09-01 17:52:01 -07:00
pcmcia
phy
platform
power PM / sleep: Update some system sleep documentation 2016-08-13 02:54:04 +02:00
powerpc powerpc: signals: Discard transaction state from signal frames 2016-08-29 12:48:40 +10:00
pps Documentation: pps: fix spelling mistake 2016-04-28 07:23:59 -06:00
prctl Documentation: Fix int/unsigned int comparison 2016-02-17 14:09:43 -07:00
pti
ptp Another relatively boring cycle for the docs tree: typo fixes, translation 2016-03-17 12:09:35 -07:00
rapidio rapidio/documentation/mport_cdev: add missing parameter description 2016-09-01 17:52:02 -07:00
RCU Documentation: Fix spelling mistake 2016-06-14 16:01:00 -07:00
s390 s390/Documentation: improve sort command for trace buffer 2016-06-13 15:58:23 +02:00
scheduler Documenation: update cgroup's document path 2016-08-03 15:43:58 -06:00
scsi Merge remote-tracking branch 'mkp-scsi/4.7/scsi-fixes' into fixes 2016-06-18 11:59:01 -07:00
security Some big changes this month, headlined by the addition of a new formatted 2016-07-26 13:05:11 -07:00
serial TTY and Serial driver update for 4.7-rc1 2016-05-20 20:57:27 -07:00
sh
sound ASoC: Updates for v4.8 2016-07-26 10:35:31 +02:00
sphinx Merge branch 'docs-next' of git://git.lwn.net/linux into topic/docs-next 2016-07-23 07:55:59 -03:00
sphinx-static doc-rst: customize RTD theme, drop padding of inline literal 2016-08-14 12:15:09 -06:00
spi
sysctl printk: add kernel parameter to control writes to /dev/kmsg 2016-08-02 19:35:06 -04:00
target target: make close_session optional 2016-05-10 01:19:26 -07:00
thermal Doc: PM: Fix a typo in intel_powerclamp.txt 2016-06-30 13:05:40 -06:00
timers Documentation: fix common spelling mistakes 2016-04-28 07:51:59 -06:00
tpm tpm: Add documentation for the tpm_vtpm_proxy device driver 2016-06-25 17:26:35 +03:00
trace tracing: expose current->comm to [ku]probe events 2016-06-20 09:54:19 -04:00
usb Documentation: tiny typo fix in usb/gadget_multi.txt 2016-06-23 08:09:10 -06:00
vDSO
virtual KVM: documentation: fix KVM_CAP_X2APIC_API information 2016-08-04 14:01:21 +02:00
vm Three fixes for the docs build, including removing an annoying warning on 2016-08-07 10:23:17 -04:00
w1 w1: add ability to set (SRAM) and store (EEPROM) configuration for temp sensors like DS18B20 2016-05-01 14:37:49 -07:00
watchdog Documentation/watchdog: check return value for magic close 2016-07-25 11:02:17 +02:00
wimax
x86 Three fixes for the docs build, including removing an annoying warning on 2016-08-07 10:23:17 -04:00
xtensa
zh_CN docs: deprecate kernel-doc-nano-HOWTO.txt 2016-07-20 16:45:37 -06:00
.gitignore Add .pyc files to .gitignore 2016-06-30 13:07:33 -06:00
00-INDEX docs: deprecate kernel-doc-nano-HOWTO.txt 2016-07-20 16:45:37 -06:00
adding-syscalls.txt documentation: trivial typo: adding-syscalls.txt: s/statat/fstatat/ 2016-04-18 11:31:49 -06:00
applying-patches.txt
assoc_array.txt
atomic_ops.txt
bad_memory.txt
basic_profiling.txt
bcache.txt bcache: documentation formatting, edited for clarity, stripe alignment notes 2016-06-23 07:58:38 -06:00
binfmt_misc.txt binfmt_misc: add F option description to documentation 2016-03-30 14:12:22 -07:00
braille-console.txt
bt8xxgpio.txt
btmrvl.txt
BUG-HUNTING
bus-virt-phys-mapping.txt
cachetlb.txt
cec.txt [media] cec.txt: add CEC framework documentation 2016-06-22 08:36:50 -03:00
cgroup-v2.txt Merge branch 'for-4.6-ns' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2016-03-21 10:05:13 -07:00
Changes
circular-buffers.txt
clk.txt
coccinelle.txt coccicheck: refer to Documentation/coccinelle.txt and wiki 2016-07-22 12:13:39 +02:00
CodeOfConflict
CodingStyle docs: deprecate kernel-doc-nano-HOWTO.txt 2016-07-20 16:45:37 -06:00
conf.py docs: Set the Sphinx default highlight language to "guess" 2016-08-12 14:11:12 -06:00
cpu-hotplug.txt
cpu-load.txt
cputopology.txt topology/sysfs: provide drawer id and siblings attributes 2016-06-13 15:58:27 +02:00
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
devices.txt Documentation: update the devices.txt documentation 2016-03-29 10:11:44 -07:00
digsig.txt
DMA-API-HOWTO.txt
DMA-API.txt dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
DMA-attributes.txt dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
dma-buf-sharing.txt dma-buf: Update docs for SYNC ioctl 2016-03-21 09:26:45 +01:00
DMA-ISA-LPC.txt
dontdiff GCC plugin infrastructure 2016-06-07 22:57:10 +02:00
dynamic-debug-howto.txt
edac.txt
efi-stub.txt
eisa.txt
email-clients.txt
flexible-arrays.txt
futex-requeue-pi.txt
gcc-plugins.txt GCC plugin infrastructure 2016-06-07 22:57:10 +02:00
gcov.txt
gdb-kernel-debugging.txt Revert "scripts/gdb: add documentation example for radix tree" 2016-07-15 14:54:27 +09:00
highuid.txt
HOWTO Documentation: Howto: Fixed subtitles style 2016-03-09 15:30:03 -07:00
hsi.txt
hw_random.txt
hwspinlock.txt
index.rst Merge tag 'drm-for-v4.8' of git://people.freedesktop.org/~airlied/linux 2016-08-01 21:44:08 -04:00
init.txt
initrd.txt
intel_txt.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
iostats.txt
IPMI.txt
IRQ-affinity.txt
IRQ-domain.txt Documentation/IRQ-domain.txt: Document irq_domain_create_{linear, tree} 2016-03-31 00:32:59 -06:00
IRQ.txt
irqflags-tracing.txt
isa.txt Documentation: Add ISA bus driver documentation 2016-05-02 09:32:04 -07:00
isapnp.txt
java.txt
kasan.txt mm, kasan: SLAB support 2016-03-25 16:37:42 -07:00
kcov.txt kernel: add kcov code coverage 2016-03-22 15:36:02 -07:00
kernel-doc-nano-HOWTO.txt docs: deprecate kernel-doc-nano-HOWTO.txt 2016-07-20 16:45:37 -06:00
kernel-docs.txt Documentation: update Michael K. Johnson's work 2016-04-15 15:37:25 -06:00
kernel-documentation.rst docs: kernel-documentation: remove some highlight directives 2016-08-12 15:12:36 -06:00
kernel-parameters.txt scsi: introduce a quirk for false cache reporting 2016-09-13 08:08:24 +02:00
kernel-per-CPU-kthreads.txt Documenation: update cgroup's document path 2016-08-03 15:43:58 -06:00
kmemcheck.txt
kmemleak.txt
kobject.txt
kprobes.txt
kref.txt
kselftest.txt Documentation: kselftest: Remove duplicate word 2016-03-09 15:33:38 -07:00
ldm.txt
local_ops.txt
lockup-watchdogs.txt
logo.gif
logo.txt
lzo.txt Documentation: lzo: fix spelling mistakes 2016-04-28 07:23:11 -06:00
magic-number.txt
mailbox.txt
Makefile [media] samples: v4l: from Documentation to samples directory 2016-05-09 18:34:37 -03:00
Makefile.sphinx Three fixes for the docs build, including removing an annoying warning on 2016-08-07 10:23:17 -04:00
ManagementStyle
md-cluster.txt md-cluster: change array_sectors and update size are not supported 2016-05-04 12:39:35 -07:00
md.txt Documentation: fix wrong value in md.txt 2016-06-23 08:08:36 -06:00
memory-barriers.txt locking/Documentation: Clarify limited control-dependency scope 2016-06-17 09:54:45 +02:00
memory-hotplug.txt memory_hotplug: introduce CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE 2016-05-19 19:12:14 -07:00
men-chameleon-bus.txt
module-signing.txt Documentation/module-signing.txt: Note need for version info if reusing a key 2016-07-27 12:38:00 +09:30
mono.txt
nommu-mmap.txt
ntb.txt
numastat.txt
oops-tracing.txt
padata.txt
parport-lowlevel.txt
parport.txt
percpu-rw-semaphore.txt
phy.txt phy: core: Allow children node to be overridden 2016-04-29 16:39:39 +02:00
pi-futex.txt
pinctrl.txt pinctrl: Flag strict is a field in struct pinmux_ops 2016-06-23 10:50:10 +02:00
pnp.txt
preempt-locking.txt
printk-formats.txt mm, printk: introduce new format string for flags 2016-03-15 16:55:16 -07:00
pwm.txt pwm: Update documentation 2016-05-17 14:48:04 +02:00
ramoops.txt ramoops: use DT reserved-memory bindings 2016-08-05 11:21:36 -07:00
rbtree.txt
remoteproc.txt
rfkill.txt rfkill: Add documentation about LED triggers 2016-02-24 09:13:12 +01:00
robust-futex-ABI.txt
robust-futexes.txt Documentation: robust-futexes: fix spelling mistakes 2016-04-28 07:26:41 -06:00
rpmsg.txt rpmsg: use module_rpmsg_driver in existing drivers and examples 2016-05-06 11:09:01 -07:00
rtc.txt rtc: implement a sysfs interface for clock offset 2016-03-14 17:08:16 +01:00
SAK.txt
SecurityBugs
serial-console.txt
sgi-ioc4.txt
SM501.txt
smsc_ece1099.txt
sparse.txt
stable_api_nonsense.txt
stable_kernel_rules.txt
static-keys.txt
SubmitChecklist
SubmittingDrivers
SubmittingPatches
svga.txt
sync_file.txt Documentation: Fix some grammar mistakes in sync_file.txt 2016-06-03 13:24:16 -06:00
sysfs-rules.txt
sysrq.txt Doc: correct the location of sysrq.c 2016-04-28 08:02:36 -06:00
this_cpu_ops.txt
ubsan.txt
unaligned-memory-access.txt
unicode.txt
unshare.txt
vfio.txt
VGA-softcursor.txt
vgaarbiter.txt
video-output.txt
vme_api.txt
volatile-considered-harmful.txt
workqueue.txt workqueue: Fix a typo in workqueue.txt 2016-07-06 02:37:38 -06:00
xillybus.txt Documentation: xillybus: fix spelling mistake 2016-04-28 07:44:54 -06:00
xz.txt
zorro.txt