kernel/linux.git/drivers/leds/trigger, branch v6.12.80

Revert "leds: trigger: netdev: Configure LED blink interval for HW offload"

2025-08-20T16:30:13+00:00

commit 26f732791f2bcab18f59c61915bbe35225f30136 upstream. This reverts commit c629c972b310af41e9e072febb6dae9a299edde6. While .led_blink_set() would previously put an LED into an unconditional permanently blinking state, the offending commit now uses same operation to (also?) set the blink timing of the netdev trigger when offloading. This breaks many if not all of the existing PHY drivers which offer offloading LED operations, as those drivers would just put the LED into blinking state after .led_blink_set() has been called. Unfortunately the change even made it into stable kernels for unknown reasons, so it should be reverted there as well. Fixes: c629c972b310a ("leds: trigger: netdev: Configure LED blink interval for HW offload") Link: https://lore.kernel.org/linux-leds/c6134e26-2e45-4121-aa15-58aaef327201@lunn.ch/T/#m9d6fe81bbcb273e59f12bbedbd633edd32118387 Suggested-by: Andrew Lunn Cc: stable@vger.kernel.org Signed-off-by: Daniel Golle Reviewed-by: Andrew Lunn Link: https://lore.kernel.org/r/6dcc77ee1c9676891d6250d8994850f521426a0f.1752334655.git.daniel@makrotopia.org Signed-off-by: Lee Jones Signed-off-by: Greg Kroah-Hartman

leds: trigger: netdev: Configure LED blink interval for HW offload

2025-05-29T09:02:58+00:00

[ Upstream commit c629c972b310af41e9e072febb6dae9a299edde6 ] In case a PHY LED implements .blink_set callback to set LED blink interval, call it even if .hw_control is already set, as that LED blink interval likely controls the blink rate of that HW offloaded LED. For PHY LEDs, that can be their activity blinking interval. The software blinking is not affected by this change. With this change, the LED interval setting looks something like this: $ echo netdev > /sys/class/leds/led:green:lan/trigger $ echo 1 > /sys/class/leds/led:green:lan/brightness $ echo 250 > /sys/class/leds/led:green:lan/interval Signed-off-by: Marek Vasut Link: https://lore.kernel.org/r/20250120113740.91807-1-marex@denx.de Signed-off-by: Lee Jones Signed-off-by: Sasha Levin

leds: trigger: netdev: Add support for tx_err and rx_err notification with LEDs

2024-08-01T12:40:01+00:00

This patch provides support for enabling blinking of LEDs when RX or TX errors are detected. Approach taken in this patch is similar to one for TX or RX data transmission indication (i.e. TRIGGER_NETDEV_TX/RX attribute). One can inspect transmission errors with: ip -s link show eth0 Example LED configuration: cd /sys/devices/platform/amba_pl@0/a001a000.leds/leds/ echo netdev > mode:blue/trigger && \ echo eth0 > mode:blue/device_name && \ echo 1 > mode:blue/tx_err Signed-off-by: Lukasz Majewski Reviewed-by: Andrew Lunn Link: https://lore.kernel.org/r/20240710100651.4059887-1-lukma@denx.de Signed-off-by: Lee Jones

leds: trigger: input-events: Rewrite to fix a serious locking issue

2024-06-26T15:56:12+00:00

The input subsystem registers LEDs with default triggers while holding the input_lock and input_register_handler() takes the input_lock this means that a triggers activate method cannot directly call input_register_handler() as the old ledtrig-input-events code is doing. The initial implementation of the input-events trigger mainly did not use the simple LED trigger mechanism because that mechanism had an issue with the initial state of a newly activated LED not matching the last led_trigger_event() call for the trigger. This issue has been fixed in commit 822c91e72eac ("leds: trigger: Store brightness set by led_trigger_event()"). Rewrite the "input-events" trigger to use the simple LED trigger mechanism, registering a single input_handler at module_init() time and using led_trigger_event() to set the brightness for all LEDs controlled by this trigger. Compared to the old code this looses the ability for the user to configure a different brightness for the on state then LED_FULL, this is standard for simple LED triggers and since this trigger is only in for-leds-next ATM losing that functionality is not a regression. This also changes the configurability of the LED off timeout from a per LED setting to a global setting (runtime modifiable module-parameter). Switching to registering a single input_handler at module_init() time fixes the following locking issue reported by lockdep: [ 2840.220145] usb 1-1.3: new low-speed USB device number 3 using xhci_hcd [ 2840.307172] usb 1-1.3: New USB device found, idVendor=0603, idProduct=0002, bcdDevice= 2.21 [ 2840.307375] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 2840.307423] usb 1-1.3: Product: USB Composite Device [ 2840.307456] usb 1-1.3: Manufacturer: SINO WEALTH [ 2840.333985] input: SINO WEALTH USB Composite Device as /devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1.3/1-1.3:1.0/0003:0603:0002.0007/input/input19 [ 2840.386545] ====================================================== [ 2840.386549] WARNING: possible circular locking dependency detected [ 2840.386554] 6.10.0-rc1+ #97 Tainted: G C E [ 2840.386558] ------------------------------------------------------ [ 2840.386562] kworker/1:1/52 is trying to acquire lock: [ 2840.386566] ffff98fcf1629300 (&led_cdev->led_access){+.+.}-{3:3}, at: led_classdev_register_ext+0x1c6/0x380 [ 2840.386590] but task is already holding lock: [ 2840.386593] ffffffff88130cc8 (input_mutex){+.+.}-{3:3}, at: input_register_device.cold+0x47/0x150 [ 2840.386608] which lock already depends on the new lock. [ 2840.386611] the existing dependency chain (in reverse order) is: [ 2840.386615] -> #3 (input_mutex){+.+.}-{3:3}: [ 2840.386624] __mutex_lock+0x8c/0xc10 [ 2840.386634] input_register_handler+0x1c/0xf0 [ 2840.386641] 0xffffffffc142c437 [ 2840.386655] led_trigger_set+0x1e1/0x2e0 [ 2840.386661] led_trigger_register+0x170/0x1b0 [ 2840.386666] do_one_initcall+0x5e/0x3a0 [ 2840.386675] do_init_module+0x60/0x220 [ 2840.386683] __do_sys_init_module+0x15f/0x190 [ 2840.386689] do_syscall_64+0x93/0x180 [ 2840.386696] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 2840.386705] -> #2 (&led_cdev->trigger_lock){+.+.}-{3:3}: [ 2840.386714] down_write+0x3b/0xd0 [ 2840.386720] led_trigger_register+0x12c/0x1b0 [ 2840.386725] rfkill_register+0xec/0x340 [rfkill] [ 2840.386739] wiphy_register+0x82a/0x930 [cfg80211] [ 2840.386907] brcmf_cfg80211_attach+0xcbd/0x1430 [brcmfmac] [ 2840.386952] brcmf_attach+0x1ba/0x4c0 [brcmfmac] [ 2840.386991] brcmf_pcie_setup+0x899/0xc70 [brcmfmac] [ 2840.387030] brcmf_fw_request_done+0x13b/0x180 [brcmfmac] [ 2840.387070] request_firmware_work_func+0x3b/0x70 [ 2840.387078] process_one_work+0x21a/0x590 [ 2840.387085] worker_thread+0x1d1/0x3e0 [ 2840.387090] kthread+0xee/0x120 [ 2840.387096] ret_from_fork+0x30/0x50 [ 2840.387105] ret_from_fork_asm+0x1a/0x30 [ 2840.387112] -> #1 (leds_list_lock){++++}-{3:3}: [ 2840.387123] down_write+0x3b/0xd0 [ 2840.387129] led_classdev_register_ext+0x29e/0x380 [ 2840.387134] 0xffffffffc0e6b74c [ 2840.387143] platform_probe+0x40/0xa0 [ 2840.387151] really_probe+0xde/0x340 [ 2840.387157] __driver_probe_device+0x78/0x110 [ 2840.387162] driver_probe_device+0x1f/0xa0 [ 2840.387168] __driver_attach+0xba/0x1c0 [ 2840.387173] bus_for_each_dev+0x6b/0xb0 [ 2840.387180] bus_add_driver+0x111/0x1f0 [ 2840.387185] driver_register+0x6e/0xc0 [ 2840.387191] do_one_initcall+0x5e/0x3a0 [ 2840.387197] do_init_module+0x60/0x220 [ 2840.387204] __do_sys_init_module+0x15f/0x190 [ 2840.387210] do_syscall_64+0x93/0x180 [ 2840.387217] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 2840.387224] -> #0 (&led_cdev->led_access){+.+.}-{3:3}: [ 2840.387233] __lock_acquire+0x11c6/0x1f20 [ 2840.387239] lock_acquire+0xc8/0x2b0 [ 2840.387244] __mutex_lock+0x8c/0xc10 [ 2840.387251] led_classdev_register_ext+0x1c6/0x380 [ 2840.387256] input_leds_connect+0x139/0x260 [ 2840.387262] input_attach_handler.isra.0+0x75/0x90 [ 2840.387268] input_register_device.cold+0xa1/0x150 [ 2840.387274] hidinput_connect+0x848/0xb00 [ 2840.387280] hid_connect+0x567/0x5a0 [ 2840.387288] hid_hw_start+0x3f/0x60 [ 2840.387294] hid_device_probe+0x10d/0x190 [ 2840.387298] really_probe+0xde/0x340 [ 2840.387304] __driver_probe_device+0x78/0x110 [ 2840.387309] driver_probe_device+0x1f/0xa0 [ 2840.387314] __device_attach_driver+0x85/0x110 [ 2840.387320] bus_for_each_drv+0x78/0xc0 [ 2840.387326] __device_attach+0xb0/0x1b0 [ 2840.387332] bus_probe_device+0x94/0xb0 [ 2840.387337] device_add+0x64a/0x860 [ 2840.387343] hid_add_device+0xe5/0x240 [ 2840.387349] usbhid_probe+0x4bb/0x600 [ 2840.387356] usb_probe_interface+0xea/0x2b0 [ 2840.387363] really_probe+0xde/0x340 [ 2840.387368] __driver_probe_device+0x78/0x110 [ 2840.387373] driver_probe_device+0x1f/0xa0 [ 2840.387378] __device_attach_driver+0x85/0x110 [ 2840.387383] bus_for_each_drv+0x78/0xc0 [ 2840.387390] __device_attach+0xb0/0x1b0 [ 2840.387395] bus_probe_device+0x94/0xb0 [ 2840.387400] device_add+0x64a/0x860 [ 2840.387405] usb_set_configuration+0x5e8/0x880 [ 2840.387411] usb_generic_driver_probe+0x3e/0x60 [ 2840.387418] usb_probe_device+0x3d/0x120 [ 2840.387423] really_probe+0xde/0x340 [ 2840.387428] __driver_probe_device+0x78/0x110 [ 2840.387434] driver_probe_device+0x1f/0xa0 [ 2840.387439] __device_attach_driver+0x85/0x110 [ 2840.387444] bus_for_each_drv+0x78/0xc0 [ 2840.387451] __device_attach+0xb0/0x1b0 [ 2840.387456] bus_probe_device+0x94/0xb0 [ 2840.387461] device_add+0x64a/0x860 [ 2840.387466] usb_new_device.cold+0x141/0x38f [ 2840.387473] hub_event+0x1166/0x1980 [ 2840.387479] process_one_work+0x21a/0x590 [ 2840.387484] worker_thread+0x1d1/0x3e0 [ 2840.387488] kthread+0xee/0x120 [ 2840.387493] ret_from_fork+0x30/0x50 [ 2840.387500] ret_from_fork_asm+0x1a/0x30 [ 2840.387506] other info that might help us debug this: [ 2840.387509] Chain exists of: &led_cdev->led_access --> &led_cdev->trigger_lock --> input_mutex [ 2840.387520] Possible unsafe locking scenario: [ 2840.387523] CPU0 CPU1 [ 2840.387526] ---- ---- [ 2840.387529] lock(input_mutex); [ 2840.387534] lock(&led_cdev->trigger_lock); [ 2840.387540] lock(input_mutex); [ 2840.387545] lock(&led_cdev->led_access); [ 2840.387550] *** DEADLOCK *** [ 2840.387552] 7 locks held by kworker/1:1/52: [ 2840.387557] #0: ffff98fcc1d07148 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x4af/0x590 [ 2840.387570] #1: ffffb67e00213e60 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x1d5/0x590 [ 2840.387583] #2: ffff98fcc6582190 (&dev->mutex){....}-{3:3}, at: hub_event+0x57/0x1980 [ 2840.387596] #3: ffff98fccb3c6990 (&dev->mutex){....}-{3:3}, at: __device_attach+0x26/0x1b0 [ 2840.387610] #4: ffff98fcc5260960 (&dev->mutex){....}-{3:3}, at: __device_attach+0x26/0x1b0 [ 2840.387622] #5: ffff98fce3999a20 (&dev->mutex){....}-{3:3}, at: __device_attach+0x26/0x1b0 [ 2840.387635] #6: ffffffff88130cc8 (input_mutex){+.+.}-{3:3}, at: input_register_device.cold+0x47/0x150 [ 2840.387649] stack backtrace: [ 2840.387653] CPU: 1 PID: 52 Comm: kworker/1:1 Tainted: G C E 6.10.0-rc1+ #97 [ 2840.387659] Hardware name: Xiaomi Inc Mipad2/Mipad, BIOS MIPad-P4.X64.0043.R03.1603071414 03/07/2016 [ 2840.387665] Workqueue: usb_hub_wq hub_event [ 2840.387674] Call Trace: [ 2840.387681] [ 2840.387689] dump_stack_lvl+0x68/0x90 [ 2840.387700] check_noncircular+0x10d/0x120 [ 2840.387710] ? register_lock_class+0x38/0x480 [ 2840.387717] ? check_noncircular+0x74/0x120 [ 2840.387727] __lock_acquire+0x11c6/0x1f20 [ 2840.387736] lock_acquire+0xc8/0x2b0 [ 2840.387743] ? led_classdev_register_ext+0x1c6/0x380 [ 2840.387753] __mutex_lock+0x8c/0xc10 [ 2840.387760] ? led_classdev_register_ext+0x1c6/0x380 [ 2840.387766] ? _raw_spin_unlock_irqrestore+0x35/0x60 [ 2840.387773] ? klist_next+0x158/0x160 [ 2840.387781] ? led_classdev_register_ext+0x1c6/0x380 [ 2840.387787] ? lockdep_init_map_type+0x58/0x250 [ 2840.387796] ? led_classdev_register_ext+0x1c6/0x380 [ 2840.387802] led_classdev_register_ext+0x1c6/0x380 [ 2840.387810] ? kvasprintf+0x70/0xb0 [ 2840.387820] ? kasprintf+0x3e/0x50 [ 2840.387829] input_leds_connect+0x139/0x260 [ 2840.387838] input_attach_handler.isra.0+0x75/0x90 [ 2840.387846] input_register_device.cold+0xa1/0x150 [ 2840.387854] hidinput_connect+0x848/0xb00 [ 2840.387862] ? usbhid_start+0x45b/0x7b0 [ 2840.387870] hid_connect+0x567/0x5a0 [ 2840.387878] ? __mutex_unlock_slowpath+0x2d/0x260 [ 2840.387891] hid_hw_start+0x3f/0x60 [ 2840.387899] hid_device_probe+0x10d/0x190 [ 2840.387906] ? __pfx___device_attach_driver+0x10/0x10 [ 2840.387913] really_probe+0xde/0x340 [ 2840.387919] ? pm_runtime_barrier+0x50/0x90 [ 2840.387927] __driver_probe_device+0x78/0x110 [ 2840.387934] driver_probe_device+0x1f/0xa0 [ 2840.387941] __device_attach_driver+0x85/0x110 [ 2840.387949] bus_for_each_drv+0x78/0xc0 [ 2840.387959] __device_attach+0xb0/0x1b0 [ 2840.387967] bus_probe_device+0x94/0xb0 [ 2840.387974] device_add+0x64a/0x860 [ 2840.387982] ? __debugfs_create_file+0x14a/0x1c0 [ 2840.387993] hid_add_device+0xe5/0x240 [ 2840.388002] usbhid_probe+0x4bb/0x600 [ 2840.388013] usb_probe_interface+0xea/0x2b0 [ 2840.388021] ? __pfx___device_attach_driver+0x10/0x10 [ 2840.388028] really_probe+0xde/0x340 [ 2840.388034] ? pm_runtime_barrier+0x50/0x90 [ 2840.388040] __driver_probe_device+0x78/0x110 [ 2840.388048] driver_probe_device+0x1f/0xa0 [ 2840.388055] __device_attach_driver+0x85/0x110 [ 2840.388062] bus_for_each_drv+0x78/0xc0 [ 2840.388071] __device_attach+0xb0/0x1b0 [ 2840.388079] bus_probe_device+0x94/0xb0 [ 2840.388086] device_add+0x64a/0x860 [ 2840.388094] ? __mutex_unlock_slowpath+0x2d/0x260 [ 2840.388103] usb_set_configuration+0x5e8/0x880 [ 2840.388114] ? __pfx___device_attach_driver+0x10/0x10 [ 2840.388121] usb_generic_driver_probe+0x3e/0x60 [ 2840.388129] usb_probe_device+0x3d/0x120 [ 2840.388137] really_probe+0xde/0x340 [ 2840.388142] ? pm_runtime_barrier+0x50/0x90 [ 2840.388149] __driver_probe_device+0x78/0x110 [ 2840.388156] driver_probe_device+0x1f/0xa0 [ 2840.388163] __device_attach_driver+0x85/0x110 [ 2840.388171] bus_for_each_drv+0x78/0xc0 [ 2840.388180] __device_attach+0xb0/0x1b0 [ 2840.388188] bus_probe_device+0x94/0xb0 [ 2840.388195] device_add+0x64a/0x860 [ 2840.388202] ? lockdep_hardirqs_on+0x78/0x100 [ 2840.388210] ? _raw_spin_unlock_irqrestore+0x35/0x60 [ 2840.388219] usb_new_device.cold+0x141/0x38f [ 2840.388227] hub_event+0x1166/0x1980 [ 2840.388242] process_one_work+0x21a/0x590 [ 2840.388249] ? move_linked_works+0x70/0xa0 [ 2840.388260] worker_thread+0x1d1/0x3e0 [ 2840.388268] ? __pfx_worker_thread+0x10/0x10 [ 2840.388273] kthread+0xee/0x120 [ 2840.388279] ? __pfx_kthread+0x10/0x10 [ 2840.388287] ret_from_fork+0x30/0x50 [ 2840.388294] ? __pfx_kthread+0x10/0x10 [ 2840.388301] ret_from_fork_asm+0x1a/0x30 [ 2840.388315] [ 2840.415630] hid-generic 0003:0603:0002.0007: input,hidraw6: USB HID v1.10 Keyboard [SINO WEALTH USB Composite Device] on usb-0000:00:14.0-1.3/input0 Signed-off-by: Hans de Goede Link: https://lore.kernel.org/r/20240602160203.27339-2-hdegoede@redhat.com Signed-off-by: Lee Jones

leds: triggers: Flush pending brightness before activating trigger

2024-06-26T15:56:07+00:00

The race fixed in timer_trig_activate() between a blocking set_brightness() call and trigger->activate() can affect any trigger. So move the call to flush_work() into led_trigger_set() where it can avoid the race for all triggers. Fixes: 0db37915d912 ("leds: avoid races with workqueue") Fixes: 8c0f693c6eff ("leds: avoid flush_work in atomic context") Cc: stable@vger.kernel.org Tested-by: Dustin L. Howett Signed-off-by: Thomas Weißschuh Link: https://lore.kernel.org/r/20240613-led-trigger-flush-v2-1-f4f970799d77@weissschuh.net Signed-off-by: Lee Jones

leds: trigger: Add new LED Input events trigger

2024-06-21T10:57:17+00:00

Add a new trigger which turns LEDs on when there is input (/dev/input/event*) activity and turns them back off again after there has been no activity for 5 seconds. This is primarily intended to control LED devices which are a backlight for capacitive touch-buttons, such as e.g. the menu / home / back buttons found on the bottom bezel of many somewhat older smartphones and tablets. This can also be used to turn on the keyboard backlight LED on input events and turn the keyboard backlight off again when idle. Signed-off-by: Hans de Goede Link: https://lore.kernel.org/r/20240531135910.168965-2-hdegoede@redhat.com Signed-off-by: Lee Jones

leds: trigger: pattern: Add support for hrtimer

2024-05-02T16:32:01+00:00

Currently, led pattern trigger uses timer_list to schedule brightness changing. As we know from timer_list API [1], it's not accurate to milliseconds and depends on HZ granularity. Example: "0 10 0 0 50 10 50 0 100 10 100 0 150 10 150 0 200 10 200 0 250 10 250 0", we expect it to be 60ms long, but it can actually be up to ~120ms (add ~10ms for each pattern when HZ == 100). But sometimes, userspace needs time accurate led patterns to make sure that pattern will be executed during expected time slot. To achieve this goal the patch introduces optional hrtimer usage for led trigger pattern, because hrtimer is microseconds accurate timer. [1]: kernel/time/timer.c#L104 Signed-off-by: Martin Kurbanov Link: https://lore.kernel.org/r/20240416201847.357099-1-mmkurbanov@salutedevices.com Signed-off-by: Lee Jones

leds: trigger: netdev: Remove not needed call to led_set_brightness in deactivate

2024-04-12T08:47:14+00:00

led_trigger_set() is the only caller of the deactivate() callback, and it calls led_set_brightness(LED_OFF) anyway after deactivate(). So we can remove the call here. Signed-off-by: Heiner Kallweit Link: https://lore.kernel.org/r/8dc929e7-8e14-4c85-aa28-9c5fe2620f52@gmail.com Signed-off-by: Lee Jones

leds: trigger: audio: Remove this trigger

2024-03-28T10:40:24+00:00

Now that the audio trigger is fully integrated in sound/core/control_led.c, we can remove it here. Signed-off-by: Heiner Kallweit Reviewed-by: Takashi Iwai Link: https://lore.kernel.org/r/1e339779-6d04-4392-8ea2-5592c0fd1aa2@gmail.com Signed-off-by: Lee Jones

ALSA: control-led: Integrate mute led trigger

2024-03-28T10:39:50+00:00

This driver is the only one calling ledtrig_audio_set(), therefore the LED audio trigger isn't usable standalone. So it makes sense to fully integrate LED audio triger handling here. The module aliases ensure that the driver is auto-loaded (if built as module) if a LED device has one of the two audio triggers as default trigger. In addition disable building the old audio mute LED trigger. Signed-off-by: Heiner Kallweit Reviewed-by: Takashi Iwai Link: https://lore.kernel.org/r/107634e6-d9ad-4a9f-881d-1eb72ea1a5a7@gmail.com Signed-off-by: Lee Jones