2019-06-04 08:11:33 +00:00
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// SPDX-License-Identifier: GPL-2.0-only
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2006-03-31 10:31:04 +00:00
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/*
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* LED Class Core
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*
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* Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
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2007-07-08 22:19:31 +00:00
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* Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com>
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2006-03-31 10:31:04 +00:00
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*/
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2014-08-07 12:10:22 +00:00
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#include <linux/ctype.h>
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#include <linux/device.h>
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#include <linux/err.h>
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2006-03-31 10:31:04 +00:00
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#include <linux/init.h>
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2014-08-07 12:10:22 +00:00
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#include <linux/kernel.h>
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#include <linux/leds.h>
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2006-03-31 10:31:04 +00:00
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#include <linux/list.h>
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2014-08-07 12:10:22 +00:00
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#include <linux/module.h>
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2019-08-22 15:19:28 +00:00
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#include <linux/property.h>
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2014-08-07 12:10:22 +00:00
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#include <linux/slab.h>
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2006-03-31 10:31:04 +00:00
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#include <linux/spinlock.h>
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Revert "leds: convert blink timer to workqueue"
This reverts commit 8b37e1bef5a6b60e949e28a4db3006e4b00bd758.
It's broken as it changes led_blink_set() in a way that it can now sleep
(while synchronously waiting for workqueue to be cancelled). That's a
problem, because it's possible that this function gets called from atomic
context (tpt_trig_timer() takes a readlock and thus disables preemption).
This has been brought up 3 weeks ago already [1] but no proper fix has
materialized, and I keep seeing the problem since 3.17-rc1.
[1] https://lkml.org/lkml/2014/8/16/128
BUG: sleeping function called from invalid context at kernel/workqueue.c:2650
in_atomic(): 1, irqs_disabled(): 0, pid: 2335, name: wpa_supplicant
5 locks held by wpa_supplicant/2335:
#0: (rtnl_mutex){+.+.+.}, at: [<ffffffff814c7c92>] rtnl_lock+0x12/0x20
#1: (&wdev->mtx){+.+.+.}, at: [<ffffffffc06e649c>] cfg80211_mgd_wext_siwessid+0x5c/0x180 [cfg80211]
#2: (&local->mtx){+.+.+.}, at: [<ffffffffc0817dea>] ieee80211_prep_connection+0x17a/0x9a0 [mac80211]
#3: (&local->chanctx_mtx){+.+.+.}, at: [<ffffffffc08081ed>] ieee80211_vif_use_channel+0x5d/0x2a0 [mac80211]
#4: (&trig->leddev_list_lock){.+.+..}, at: [<ffffffffc081e68c>] tpt_trig_timer+0xec/0x170 [mac80211]
CPU: 0 PID: 2335 Comm: wpa_supplicant Not tainted 3.17.0-rc3 #1
Hardware name: LENOVO 7470BN2/7470BN2, BIOS 6DET38WW (2.02 ) 12/19/2008
ffff8800360b5a50 ffff8800751f76d8 ffffffff8159e97f ffff8800360b5a30
ffff8800751f76e8 ffffffff810739a5 ffff8800751f77b0 ffffffff8106862f
ffffffff810685d0 0aa2209200000000 ffff880000000004 ffff8800361c59d0
Call Trace:
[<ffffffff8159e97f>] dump_stack+0x4d/0x66
[<ffffffff810739a5>] __might_sleep+0xe5/0x120
[<ffffffff8106862f>] flush_work+0x5f/0x270
[<ffffffff810685d0>] ? mod_delayed_work_on+0x80/0x80
[<ffffffff810945ca>] ? mark_held_locks+0x6a/0x90
[<ffffffff81068a5f>] ? __cancel_work_timer+0x6f/0x100
[<ffffffff810946ed>] ? trace_hardirqs_on_caller+0xfd/0x1c0
[<ffffffff81068a6b>] __cancel_work_timer+0x7b/0x100
[<ffffffff81068b0e>] cancel_delayed_work_sync+0xe/0x10
[<ffffffff8147cf3b>] led_blink_set+0x1b/0x40
[<ffffffffc081e6b0>] tpt_trig_timer+0x110/0x170 [mac80211]
[<ffffffffc081ecdd>] ieee80211_mod_tpt_led_trig+0x9d/0x160 [mac80211]
[<ffffffffc07e4278>] __ieee80211_recalc_idle+0x98/0x140 [mac80211]
[<ffffffffc07e59ce>] ieee80211_idle_off+0xe/0x10 [mac80211]
[<ffffffffc0804e5b>] ieee80211_add_chanctx+0x3b/0x220 [mac80211]
[<ffffffffc08062e4>] ieee80211_new_chanctx+0x44/0xf0 [mac80211]
[<ffffffffc080838a>] ieee80211_vif_use_channel+0x1fa/0x2a0 [mac80211]
[<ffffffffc0817df8>] ieee80211_prep_connection+0x188/0x9a0 [mac80211]
[<ffffffffc081c246>] ieee80211_mgd_auth+0x256/0x2e0 [mac80211]
[<ffffffffc07eab33>] ieee80211_auth+0x13/0x20 [mac80211]
[<ffffffffc06cb006>] cfg80211_mlme_auth+0x106/0x270 [cfg80211]
[<ffffffffc06ce085>] cfg80211_conn_do_work+0x155/0x3b0 [cfg80211]
[<ffffffffc06cf670>] cfg80211_connect+0x3f0/0x540 [cfg80211]
[<ffffffffc06e6148>] cfg80211_mgd_wext_connect+0x158/0x1f0 [cfg80211]
[<ffffffffc06e651e>] cfg80211_mgd_wext_siwessid+0xde/0x180 [cfg80211]
[<ffffffffc06e36c0>] ? cfg80211_wext_giwessid+0x50/0x50 [cfg80211]
[<ffffffffc06e36dd>] cfg80211_wext_siwessid+0x1d/0x40 [cfg80211]
[<ffffffff81584d0c>] ioctl_standard_iw_point+0x14c/0x3e0
[<ffffffff810946ed>] ? trace_hardirqs_on_caller+0xfd/0x1c0
[<ffffffff8158502a>] ioctl_standard_call+0x8a/0xd0
[<ffffffff81584fa0>] ? ioctl_standard_iw_point+0x3e0/0x3e0
[<ffffffff81584b76>] wireless_process_ioctl.constprop.10+0xb6/0x100
[<ffffffff8158521d>] wext_handle_ioctl+0x5d/0xb0
[<ffffffff814cfb29>] dev_ioctl+0x329/0x620
[<ffffffff810946ed>] ? trace_hardirqs_on_caller+0xfd/0x1c0
[<ffffffff8149c7f2>] sock_ioctl+0x142/0x2e0
[<ffffffff811b0140>] do_vfs_ioctl+0x300/0x520
[<ffffffff815a67fb>] ? sysret_check+0x1b/0x56
[<ffffffff810946ed>] ? trace_hardirqs_on_caller+0xfd/0x1c0
[<ffffffff811b03e1>] SyS_ioctl+0x81/0xa0
[<ffffffff815a67d6>] system_call_fastpath+0x1a/0x1f
wlan0: send auth to 00:0b:6b:3c:8c:e4 (try 1/3)
wlan0: authenticated
wlan0: associate with 00:0b:6b:3c:8c:e4 (try 1/3)
wlan0: RX AssocResp from 00:0b:6b:3c:8c:e4 (capab=0x431 status=0 aid=2)
wlan0: associated
IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
cfg80211: Calling CRDA for country: NA
wlan0: Limiting TX power to 27 (27 - 0) dBm as advertised by 00:0b:6b:3c:8c:e4
=================================
[ INFO: inconsistent lock state ]
3.17.0-rc3 #1 Not tainted
---------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
((&(&led_cdev->blink_work)->work)){+.?...}, at: [<ffffffff810685d0>] flush_work+0x0/0x270
{SOFTIRQ-ON-W} state was registered at:
[<ffffffff81094dbe>] __lock_acquire+0x30e/0x1a30
[<ffffffff81096c81>] lock_acquire+0x91/0x110
[<ffffffff81068608>] flush_work+0x38/0x270
[<ffffffff81068a6b>] __cancel_work_timer+0x7b/0x100
[<ffffffff81068b0e>] cancel_delayed_work_sync+0xe/0x10
[<ffffffff8147cf3b>] led_blink_set+0x1b/0x40
[<ffffffffc081e6b0>] tpt_trig_timer+0x110/0x170 [mac80211]
[<ffffffffc081ecdd>] ieee80211_mod_tpt_led_trig+0x9d/0x160 [mac80211]
[<ffffffffc07e4278>] __ieee80211_recalc_idle+0x98/0x140 [mac80211]
[<ffffffffc07e59ce>] ieee80211_idle_off+0xe/0x10 [mac80211]
[<ffffffffc0804e5b>] ieee80211_add_chanctx+0x3b/0x220 [mac80211]
[<ffffffffc08062e4>] ieee80211_new_chanctx+0x44/0xf0 [mac80211]
[<ffffffffc080838a>] ieee80211_vif_use_channel+0x1fa/0x2a0 [mac80211]
[<ffffffffc0817df8>] ieee80211_prep_connection+0x188/0x9a0 [mac80211]
[<ffffffffc081c246>] ieee80211_mgd_auth+0x256/0x2e0 [mac80211]
[<ffffffffc07eab33>] ieee80211_auth+0x13/0x20 [mac80211]
[<ffffffffc06cb006>] cfg80211_mlme_auth+0x106/0x270 [cfg80211]
[<ffffffffc06ce085>] cfg80211_conn_do_work+0x155/0x3b0 [cfg80211]
[<ffffffffc06cf670>] cfg80211_connect+0x3f0/0x540 [cfg80211]
[<ffffffffc06e6148>] cfg80211_mgd_wext_connect+0x158/0x1f0 [cfg80211]
[<ffffffffc06e651e>] cfg80211_mgd_wext_siwessid+0xde/0x180 [cfg80211]
[<ffffffffc06e36dd>] cfg80211_wext_siwessid+0x1d/0x40 [cfg80211]
[<ffffffff81584d0c>] ioctl_standard_iw_point+0x14c/0x3e0
[<ffffffff8158502a>] ioctl_standard_call+0x8a/0xd0
[<ffffffff81584b76>] wireless_process_ioctl.constprop.10+0xb6/0x100
[<ffffffff8158521d>] wext_handle_ioctl+0x5d/0xb0
[<ffffffff814cfb29>] dev_ioctl+0x329/0x620
[<ffffffff8149c7f2>] sock_ioctl+0x142/0x2e0
[<ffffffff811b0140>] do_vfs_ioctl+0x300/0x520
[<ffffffff811b03e1>] SyS_ioctl+0x81/0xa0
[<ffffffff815a67d6>] system_call_fastpath+0x1a/0x1f
irq event stamp: 493416
hardirqs last enabled at (493416): [<ffffffff81068a5f>] __cancel_work_timer+0x6f/0x100
hardirqs last disabled at (493415): [<ffffffff81067e9f>] try_to_grab_pending+0x1f/0x160
softirqs last enabled at (493408): [<ffffffff81053ced>] _local_bh_enable+0x1d/0x50
softirqs last disabled at (493409): [<ffffffff81054c75>] irq_exit+0xa5/0xb0
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock((&(&led_cdev->blink_work)->work));
<Interrupt>
lock((&(&led_cdev->blink_work)->work));
*** DEADLOCK ***
2 locks held by swapper/0/0:
#0: (((&tpt_trig->timer))){+.-...}, at: [<ffffffff810b4c50>] call_timer_fn+0x0/0x180
#1: (&trig->leddev_list_lock){.+.?..}, at: [<ffffffffc081e68c>] tpt_trig_timer+0xec/0x170 [mac80211]
stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.17.0-rc3 #1
Hardware name: LENOVO 7470BN2/7470BN2, BIOS 6DET38WW (2.02 ) 12/19/2008
ffffffff8246eb30 ffff88007c203b00 ffffffff8159e97f ffffffff81a194c0
ffff88007c203b50 ffffffff81599c29 0000000000000001 ffffffff00000001
ffff880000000000 0000000000000006 ffffffff81a194c0 ffffffff81093ad0
Call Trace:
<IRQ> [<ffffffff8159e97f>] dump_stack+0x4d/0x66
[<ffffffff81599c29>] print_usage_bug+0x1f4/0x205
[<ffffffff81093ad0>] ? check_usage_backwards+0x140/0x140
[<ffffffff810944d3>] mark_lock+0x223/0x2b0
[<ffffffff81094d60>] __lock_acquire+0x2b0/0x1a30
[<ffffffff81096c81>] lock_acquire+0x91/0x110
[<ffffffff810685d0>] ? mod_delayed_work_on+0x80/0x80
[<ffffffffc081e5a0>] ? __ieee80211_get_rx_led_name+0x10/0x10 [mac80211]
[<ffffffff81068608>] flush_work+0x38/0x270
[<ffffffff810685d0>] ? mod_delayed_work_on+0x80/0x80
[<ffffffff810945ca>] ? mark_held_locks+0x6a/0x90
[<ffffffff81068a5f>] ? __cancel_work_timer+0x6f/0x100
[<ffffffffc081e5a0>] ? __ieee80211_get_rx_led_name+0x10/0x10 [mac80211]
[<ffffffff8109469d>] ? trace_hardirqs_on_caller+0xad/0x1c0
[<ffffffffc081e5a0>] ? __ieee80211_get_rx_led_name+0x10/0x10 [mac80211]
[<ffffffff81068a6b>] __cancel_work_timer+0x7b/0x100
[<ffffffff81068b0e>] cancel_delayed_work_sync+0xe/0x10
[<ffffffff8147cf3b>] led_blink_set+0x1b/0x40
[<ffffffffc081e6b0>] tpt_trig_timer+0x110/0x170 [mac80211]
[<ffffffff810b4cc5>] call_timer_fn+0x75/0x180
[<ffffffff810b4c50>] ? process_timeout+0x10/0x10
[<ffffffffc081e5a0>] ? __ieee80211_get_rx_led_name+0x10/0x10 [mac80211]
[<ffffffff810b50ac>] run_timer_softirq+0x1fc/0x2f0
[<ffffffff81054805>] __do_softirq+0x115/0x2e0
[<ffffffff81054c75>] irq_exit+0xa5/0xb0
[<ffffffff810049b3>] do_IRQ+0x53/0xf0
[<ffffffff815a74af>] common_interrupt+0x6f/0x6f
<EOI> [<ffffffff8147b56e>] ? cpuidle_enter_state+0x6e/0x180
[<ffffffff8147b732>] cpuidle_enter+0x12/0x20
[<ffffffff8108bba0>] cpu_startup_entry+0x330/0x360
[<ffffffff8158fb51>] rest_init+0xc1/0xd0
[<ffffffff8158fa90>] ? csum_partial_copy_generic+0x170/0x170
[<ffffffff81af3ff2>] start_kernel+0x44f/0x45a
[<ffffffff81af399c>] ? set_init_arg+0x53/0x53
[<ffffffff81af35ad>] x86_64_start_reservations+0x2a/0x2c
[<ffffffff81af36a0>] x86_64_start_kernel+0xf1/0xf4
Cc: Vincent Donnefort <vdonnefort@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
2014-09-02 09:03:12 +00:00
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#include <linux/timer.h>
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2016-09-16 19:16:49 +00:00
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#include <uapi/linux/uleds.h>
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2019-10-03 08:28:09 +00:00
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#include <linux/of.h>
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2006-03-31 10:31:04 +00:00
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#include "leds.h"
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static struct class *leds_class;
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2013-07-24 22:05:13 +00:00
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static ssize_t brightness_show(struct device *dev,
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2007-07-08 22:19:31 +00:00
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struct device_attribute *attr, char *buf)
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2006-03-31 10:31:04 +00:00
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{
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2007-07-08 22:19:31 +00:00
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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2006-03-31 10:31:04 +00:00
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/* no lock needed for this */
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2008-03-18 09:47:48 +00:00
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led_update_brightness(led_cdev);
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2006-03-31 10:31:04 +00:00
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2008-10-13 09:41:39 +00:00
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return sprintf(buf, "%u\n", led_cdev->brightness);
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2006-03-31 10:31:04 +00:00
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}
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2013-07-24 22:05:13 +00:00
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static ssize_t brightness_store(struct device *dev,
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2007-07-08 22:19:31 +00:00
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struct device_attribute *attr, const char *buf, size_t size)
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2006-03-31 10:31:04 +00:00
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{
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2007-07-08 22:19:31 +00:00
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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2012-05-29 22:07:26 +00:00
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unsigned long state;
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2014-09-22 15:21:04 +00:00
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ssize_t ret;
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mutex_lock(&led_cdev->led_access);
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if (led_sysfs_is_disabled(led_cdev)) {
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ret = -EBUSY;
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goto unlock;
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}
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2006-03-31 10:31:04 +00:00
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2012-05-29 22:07:26 +00:00
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ret = kstrtoul(buf, 10, &state);
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if (ret)
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2014-09-22 15:21:04 +00:00
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goto unlock;
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2006-05-15 16:44:17 +00:00
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2012-05-29 22:07:26 +00:00
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if (state == LED_OFF)
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led_trigger_remove(led_cdev);
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2014-11-14 10:50:18 +00:00
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led_set_brightness(led_cdev, state);
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2019-04-29 15:22:59 +00:00
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flush_work(&led_cdev->set_brightness_work);
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2008-03-09 20:54:37 +00:00
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2014-09-22 15:21:04 +00:00
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ret = size;
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unlock:
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mutex_unlock(&led_cdev->led_access);
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return ret;
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2006-03-31 10:31:04 +00:00
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}
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2013-07-24 22:05:13 +00:00
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static DEVICE_ATTR_RW(brightness);
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2006-03-31 10:31:04 +00:00
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2014-08-07 12:10:24 +00:00
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static ssize_t max_brightness_show(struct device *dev,
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2009-01-10 18:54:39 +00:00
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struct device_attribute *attr, char *buf)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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return sprintf(buf, "%u\n", led_cdev->max_brightness);
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}
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2014-08-07 12:10:24 +00:00
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static DEVICE_ATTR_RO(max_brightness);
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2009-01-10 18:54:39 +00:00
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2006-03-31 10:31:05 +00:00
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#ifdef CONFIG_LEDS_TRIGGERS
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2019-09-29 14:18:49 +00:00
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static BIN_ATTR(trigger, 0644, led_trigger_read, led_trigger_write, 0);
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static struct bin_attribute *led_trigger_bin_attrs[] = {
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&bin_attr_trigger,
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2013-07-24 22:05:13 +00:00
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NULL,
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};
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static const struct attribute_group led_trigger_group = {
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2019-09-29 14:18:49 +00:00
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.bin_attrs = led_trigger_bin_attrs,
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2013-07-24 22:05:13 +00:00
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};
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#endif
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static struct attribute *led_class_attrs[] = {
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&dev_attr_brightness.attr,
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&dev_attr_max_brightness.attr,
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NULL,
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};
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static const struct attribute_group led_group = {
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.attrs = led_class_attrs,
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};
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static const struct attribute_group *led_groups[] = {
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&led_group,
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#ifdef CONFIG_LEDS_TRIGGERS
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&led_trigger_group,
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2006-03-31 10:31:05 +00:00
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#endif
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2013-07-24 22:05:13 +00:00
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NULL,
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2010-03-10 17:32:18 +00:00
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};
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2006-03-31 10:31:04 +00:00
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2017-01-29 13:42:52 +00:00
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#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
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static ssize_t brightness_hw_changed_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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if (led_cdev->brightness_hw_changed == -1)
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return -ENODATA;
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return sprintf(buf, "%u\n", led_cdev->brightness_hw_changed);
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}
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static DEVICE_ATTR_RO(brightness_hw_changed);
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static int led_add_brightness_hw_changed(struct led_classdev *led_cdev)
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{
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struct device *dev = led_cdev->dev;
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int ret;
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|
|
ret = device_create_file(dev, &dev_attr_brightness_hw_changed);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(dev, "Error creating brightness_hw_changed\n");
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
led_cdev->brightness_hw_changed_kn =
|
|
|
|
sysfs_get_dirent(dev->kobj.sd, "brightness_hw_changed");
|
|
|
|
if (!led_cdev->brightness_hw_changed_kn) {
|
|
|
|
dev_err(dev, "Error getting brightness_hw_changed kn\n");
|
|
|
|
device_remove_file(dev, &dev_attr_brightness_hw_changed);
|
|
|
|
return -ENXIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev)
|
|
|
|
{
|
|
|
|
sysfs_put(led_cdev->brightness_hw_changed_kn);
|
|
|
|
device_remove_file(led_cdev->dev, &dev_attr_brightness_hw_changed);
|
|
|
|
}
|
|
|
|
|
|
|
|
void led_classdev_notify_brightness_hw_changed(struct led_classdev *led_cdev,
|
|
|
|
enum led_brightness brightness)
|
|
|
|
{
|
|
|
|
if (WARN_ON(!led_cdev->brightness_hw_changed_kn))
|
|
|
|
return;
|
|
|
|
|
|
|
|
led_cdev->brightness_hw_changed = brightness;
|
|
|
|
sysfs_notify_dirent(led_cdev->brightness_hw_changed_kn);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(led_classdev_notify_brightness_hw_changed);
|
|
|
|
#else
|
|
|
|
static int led_add_brightness_hw_changed(struct led_classdev *led_cdev)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static void led_remove_brightness_hw_changed(struct led_classdev *led_cdev)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2006-03-31 10:31:04 +00:00
|
|
|
/**
|
|
|
|
* led_classdev_suspend - suspend an led_classdev.
|
|
|
|
* @led_cdev: the led_classdev to suspend.
|
|
|
|
*/
|
|
|
|
void led_classdev_suspend(struct led_classdev *led_cdev)
|
|
|
|
{
|
|
|
|
led_cdev->flags |= LED_SUSPENDED;
|
2015-10-07 09:10:41 +00:00
|
|
|
led_set_brightness_nopm(led_cdev, 0);
|
2006-03-31 10:31:04 +00:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(led_classdev_suspend);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* led_classdev_resume - resume an led_classdev.
|
|
|
|
* @led_cdev: the led_classdev to resume.
|
|
|
|
*/
|
|
|
|
void led_classdev_resume(struct led_classdev *led_cdev)
|
|
|
|
{
|
2015-10-07 09:10:41 +00:00
|
|
|
led_set_brightness_nopm(led_cdev, led_cdev->brightness);
|
2015-01-09 15:22:51 +00:00
|
|
|
|
|
|
|
if (led_cdev->flash_resume)
|
|
|
|
led_cdev->flash_resume(led_cdev);
|
|
|
|
|
2006-03-31 10:31:04 +00:00
|
|
|
led_cdev->flags &= ~LED_SUSPENDED;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(led_classdev_resume);
|
|
|
|
|
2015-04-24 11:57:10 +00:00
|
|
|
#ifdef CONFIG_PM_SLEEP
|
2013-06-20 19:08:44 +00:00
|
|
|
static int led_suspend(struct device *dev)
|
2009-01-08 17:55:03 +00:00
|
|
|
{
|
|
|
|
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
|
|
|
|
|
|
|
if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
|
|
|
|
led_classdev_suspend(led_cdev);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int led_resume(struct device *dev)
|
|
|
|
{
|
|
|
|
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
|
|
|
|
|
|
|
if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
|
|
|
|
led_classdev_resume(led_cdev);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2015-04-24 11:57:10 +00:00
|
|
|
#endif
|
2009-01-08 17:55:03 +00:00
|
|
|
|
2015-04-24 11:57:10 +00:00
|
|
|
static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops, led_suspend, led_resume);
|
2013-06-20 19:08:44 +00:00
|
|
|
|
2019-10-03 08:28:09 +00:00
|
|
|
/**
|
|
|
|
* of_led_get() - request a LED device via the LED framework
|
|
|
|
* @np: device node to get the LED device from
|
|
|
|
* @index: the index of the LED
|
|
|
|
*
|
|
|
|
* Returns the LED device parsed from the phandle specified in the "leds"
|
|
|
|
* property of a device tree node or a negative error-code on failure.
|
|
|
|
*/
|
|
|
|
struct led_classdev *of_led_get(struct device_node *np, int index)
|
|
|
|
{
|
|
|
|
struct device *led_dev;
|
|
|
|
struct led_classdev *led_cdev;
|
|
|
|
struct device_node *led_node;
|
|
|
|
|
|
|
|
led_node = of_parse_phandle(np, "leds", index);
|
|
|
|
if (!led_node)
|
|
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
|
|
|
|
led_dev = class_find_device_by_of_node(leds_class, led_node);
|
|
|
|
of_node_put(led_node);
|
|
|
|
|
|
|
|
if (!led_dev)
|
|
|
|
return ERR_PTR(-EPROBE_DEFER);
|
|
|
|
|
|
|
|
led_cdev = dev_get_drvdata(led_dev);
|
|
|
|
|
|
|
|
if (!try_module_get(led_cdev->dev->parent->driver->owner))
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
|
|
|
|
return led_cdev;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(of_led_get);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* led_put() - release a LED device
|
|
|
|
* @led_cdev: LED device
|
|
|
|
*/
|
|
|
|
void led_put(struct led_classdev *led_cdev)
|
|
|
|
{
|
|
|
|
module_put(led_cdev->dev->parent->driver->owner);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(led_put);
|
|
|
|
|
2019-10-03 08:28:10 +00:00
|
|
|
static void devm_led_release(struct device *dev, void *res)
|
|
|
|
{
|
|
|
|
struct led_classdev **p = res;
|
|
|
|
|
|
|
|
led_put(*p);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* devm_of_led_get - Resource-managed request of a LED device
|
|
|
|
* @dev: LED consumer
|
|
|
|
* @index: index of the LED to obtain in the consumer
|
|
|
|
*
|
|
|
|
* The device node of the device is parse to find the request LED device.
|
|
|
|
* The LED device returned from this function is automatically released
|
|
|
|
* on driver detach.
|
|
|
|
*
|
|
|
|
* @return a pointer to a LED device or ERR_PTR(errno) on failure.
|
|
|
|
*/
|
|
|
|
struct led_classdev *__must_check devm_of_led_get(struct device *dev,
|
|
|
|
int index)
|
|
|
|
{
|
|
|
|
struct led_classdev *led;
|
|
|
|
struct led_classdev **dr;
|
|
|
|
|
|
|
|
if (!dev)
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
|
|
|
|
/* Not using device tree? */
|
|
|
|
if (!IS_ENABLED(CONFIG_OF) || !dev->of_node)
|
|
|
|
return ERR_PTR(-ENOTSUPP);
|
|
|
|
|
|
|
|
led = of_led_get(dev->of_node, index);
|
|
|
|
if (IS_ERR(led))
|
|
|
|
return led;
|
|
|
|
|
|
|
|
dr = devres_alloc(devm_led_release, sizeof(struct led_classdev *),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!dr) {
|
|
|
|
led_put(led);
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
}
|
|
|
|
|
|
|
|
*dr = led;
|
|
|
|
devres_add(dev, dr);
|
|
|
|
|
|
|
|
return led;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(devm_of_led_get);
|
|
|
|
|
2015-03-30 17:45:59 +00:00
|
|
|
static int led_classdev_next_name(const char *init_name, char *name,
|
|
|
|
size_t len)
|
|
|
|
{
|
|
|
|
unsigned int i = 0;
|
|
|
|
int ret = 0;
|
2015-07-31 11:36:21 +00:00
|
|
|
struct device *dev;
|
2015-03-30 17:45:59 +00:00
|
|
|
|
|
|
|
strlcpy(name, init_name, len);
|
|
|
|
|
2015-07-31 11:36:21 +00:00
|
|
|
while ((ret < len) &&
|
2019-07-23 22:18:32 +00:00
|
|
|
(dev = class_find_device_by_name(leds_class, name))) {
|
2015-07-31 11:36:21 +00:00
|
|
|
put_device(dev);
|
2015-03-30 17:45:59 +00:00
|
|
|
ret = snprintf(name, len, "%s_%u", init_name, ++i);
|
2015-07-31 11:36:21 +00:00
|
|
|
}
|
2015-03-30 17:45:59 +00:00
|
|
|
|
|
|
|
if (ret >= len)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
return i;
|
|
|
|
}
|
|
|
|
|
2006-03-31 10:31:04 +00:00
|
|
|
/**
|
2019-06-09 18:19:03 +00:00
|
|
|
* led_classdev_register_ext - register a new object of led_classdev class
|
|
|
|
* with init data.
|
2017-03-06 05:19:44 +00:00
|
|
|
*
|
|
|
|
* @parent: parent of LED device
|
2006-03-31 10:31:04 +00:00
|
|
|
* @led_cdev: the led_classdev structure for this device.
|
2019-06-09 18:19:03 +00:00
|
|
|
* @init_data: LED class device initialization data
|
2006-03-31 10:31:04 +00:00
|
|
|
*/
|
2019-06-09 18:19:03 +00:00
|
|
|
int led_classdev_register_ext(struct device *parent,
|
|
|
|
struct led_classdev *led_cdev,
|
|
|
|
struct led_init_data *init_data)
|
2006-03-31 10:31:04 +00:00
|
|
|
{
|
2019-06-09 18:19:04 +00:00
|
|
|
char composed_name[LED_MAX_NAME_SIZE];
|
|
|
|
char final_name[LED_MAX_NAME_SIZE];
|
|
|
|
const char *proposed_name = composed_name;
|
2015-03-30 17:45:59 +00:00
|
|
|
int ret;
|
|
|
|
|
2019-06-09 18:19:04 +00:00
|
|
|
if (init_data) {
|
|
|
|
if (init_data->devname_mandatory && !init_data->devicename) {
|
|
|
|
dev_err(parent, "Mandatory device name is missing");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
ret = led_compose_name(parent, init_data, composed_name);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
} else {
|
|
|
|
proposed_name = led_cdev->name;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = led_classdev_next_name(proposed_name, final_name, sizeof(final_name));
|
2015-03-30 17:45:59 +00:00
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
2018-05-23 22:22:21 +00:00
|
|
|
mutex_init(&led_cdev->led_access);
|
|
|
|
mutex_lock(&led_cdev->led_access);
|
2014-06-25 17:08:44 +00:00
|
|
|
led_cdev->dev = device_create_with_groups(leds_class, parent, 0,
|
2019-06-09 18:19:04 +00:00
|
|
|
led_cdev, led_cdev->groups, "%s", final_name);
|
2018-05-23 22:22:21 +00:00
|
|
|
if (IS_ERR(led_cdev->dev)) {
|
|
|
|
mutex_unlock(&led_cdev->led_access);
|
2007-07-08 22:19:31 +00:00
|
|
|
return PTR_ERR(led_cdev->dev);
|
2018-05-23 22:22:21 +00:00
|
|
|
}
|
2020-01-05 22:31:14 +00:00
|
|
|
if (init_data && init_data->fwnode) {
|
2019-08-22 15:19:28 +00:00
|
|
|
led_cdev->dev->fwnode = init_data->fwnode;
|
2020-01-05 22:31:14 +00:00
|
|
|
led_cdev->dev->of_node = to_of_node(init_data->fwnode);
|
|
|
|
}
|
2006-03-31 10:31:04 +00:00
|
|
|
|
2015-03-30 17:45:59 +00:00
|
|
|
if (ret)
|
2015-03-26 23:42:05 +00:00
|
|
|
dev_warn(parent, "Led %s renamed to %s due to name collision",
|
2020-04-01 09:51:47 +00:00
|
|
|
proposed_name, dev_name(led_cdev->dev));
|
2015-03-30 17:45:59 +00:00
|
|
|
|
2017-01-29 13:42:52 +00:00
|
|
|
if (led_cdev->flags & LED_BRIGHT_HW_CHANGED) {
|
|
|
|
ret = led_add_brightness_hw_changed(led_cdev);
|
|
|
|
if (ret) {
|
|
|
|
device_unregister(led_cdev->dev);
|
2019-08-16 10:52:29 +00:00
|
|
|
led_cdev->dev = NULL;
|
2018-05-23 22:22:21 +00:00
|
|
|
mutex_unlock(&led_cdev->led_access);
|
2017-01-29 13:42:52 +00:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-11-08 13:38:46 +00:00
|
|
|
led_cdev->work_flags = 0;
|
2008-10-20 22:16:17 +00:00
|
|
|
#ifdef CONFIG_LEDS_TRIGGERS
|
|
|
|
init_rwsem(&led_cdev->trigger_lock);
|
2017-01-29 13:42:52 +00:00
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
|
|
|
|
led_cdev->brightness_hw_changed = -1;
|
2008-10-20 22:16:17 +00:00
|
|
|
#endif
|
2006-03-31 10:31:04 +00:00
|
|
|
/* add to the list of leds */
|
2007-12-31 23:09:44 +00:00
|
|
|
down_write(&leds_list_lock);
|
2006-03-31 10:31:04 +00:00
|
|
|
list_add_tail(&led_cdev->node, &leds_list);
|
2007-12-31 23:09:44 +00:00
|
|
|
up_write(&leds_list_lock);
|
2006-03-31 10:31:04 +00:00
|
|
|
|
2009-01-10 18:54:39 +00:00
|
|
|
if (!led_cdev->max_brightness)
|
|
|
|
led_cdev->max_brightness = LED_FULL;
|
|
|
|
|
2008-03-18 09:47:48 +00:00
|
|
|
led_update_brightness(led_cdev);
|
|
|
|
|
2015-09-28 12:38:04 +00:00
|
|
|
led_init_core(led_cdev);
|
2010-11-11 22:05:21 +00:00
|
|
|
|
2006-03-31 10:31:05 +00:00
|
|
|
#ifdef CONFIG_LEDS_TRIGGERS
|
2006-10-17 07:10:20 +00:00
|
|
|
led_trigger_set_default(led_cdev);
|
2006-03-31 10:31:05 +00:00
|
|
|
#endif
|
|
|
|
|
2018-05-23 22:22:21 +00:00
|
|
|
mutex_unlock(&led_cdev->led_access);
|
|
|
|
|
2012-11-25 05:27:35 +00:00
|
|
|
dev_dbg(parent, "Registered led device: %s\n",
|
2007-07-08 22:19:31 +00:00
|
|
|
led_cdev->name);
|
2006-03-31 10:31:04 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2019-06-09 18:19:03 +00:00
|
|
|
EXPORT_SYMBOL_GPL(led_classdev_register_ext);
|
2006-03-31 10:31:04 +00:00
|
|
|
|
|
|
|
/**
|
2008-10-20 22:04:36 +00:00
|
|
|
* led_classdev_unregister - unregisters a object of led_properties class.
|
2006-10-03 21:31:30 +00:00
|
|
|
* @led_cdev: the led device to unregister
|
2006-03-31 10:31:04 +00:00
|
|
|
*
|
|
|
|
* Unregisters a previously registered via led_classdev_register object.
|
|
|
|
*/
|
2008-03-23 19:28:24 +00:00
|
|
|
void led_classdev_unregister(struct led_classdev *led_cdev)
|
2006-03-31 10:31:04 +00:00
|
|
|
{
|
2019-08-16 10:52:29 +00:00
|
|
|
if (IS_ERR_OR_NULL(led_cdev->dev))
|
|
|
|
return;
|
|
|
|
|
2006-03-31 10:31:05 +00:00
|
|
|
#ifdef CONFIG_LEDS_TRIGGERS
|
2007-11-10 13:29:04 +00:00
|
|
|
down_write(&led_cdev->trigger_lock);
|
2006-03-31 10:31:05 +00:00
|
|
|
if (led_cdev->trigger)
|
|
|
|
led_trigger_set(led_cdev, NULL);
|
2007-11-10 13:29:04 +00:00
|
|
|
up_write(&led_cdev->trigger_lock);
|
2006-03-31 10:31:05 +00:00
|
|
|
#endif
|
2006-03-31 10:31:04 +00:00
|
|
|
|
2016-01-22 20:43:48 +00:00
|
|
|
led_cdev->flags |= LED_UNREGISTERING;
|
|
|
|
|
2010-11-11 22:05:21 +00:00
|
|
|
/* Stop blinking */
|
2012-08-15 13:44:34 +00:00
|
|
|
led_stop_software_blink(led_cdev);
|
2015-11-20 08:03:00 +00:00
|
|
|
|
2012-06-13 20:34:30 +00:00
|
|
|
led_set_brightness(led_cdev, LED_OFF);
|
2010-11-11 22:05:21 +00:00
|
|
|
|
2015-11-20 08:03:00 +00:00
|
|
|
flush_work(&led_cdev->set_brightness_work);
|
|
|
|
|
2017-01-29 13:42:52 +00:00
|
|
|
if (led_cdev->flags & LED_BRIGHT_HW_CHANGED)
|
|
|
|
led_remove_brightness_hw_changed(led_cdev);
|
|
|
|
|
2008-03-23 19:28:24 +00:00
|
|
|
device_unregister(led_cdev->dev);
|
2006-03-31 10:31:04 +00:00
|
|
|
|
2007-12-31 23:09:44 +00:00
|
|
|
down_write(&leds_list_lock);
|
2006-03-31 10:31:04 +00:00
|
|
|
list_del(&led_cdev->node);
|
2007-12-31 23:09:44 +00:00
|
|
|
up_write(&leds_list_lock);
|
2014-09-22 15:21:04 +00:00
|
|
|
|
|
|
|
mutex_destroy(&led_cdev->led_access);
|
2006-03-31 10:31:04 +00:00
|
|
|
}
|
2008-03-23 19:28:24 +00:00
|
|
|
EXPORT_SYMBOL_GPL(led_classdev_unregister);
|
2006-03-31 10:31:04 +00:00
|
|
|
|
2015-02-24 00:11:41 +00:00
|
|
|
static void devm_led_classdev_release(struct device *dev, void *res)
|
|
|
|
{
|
|
|
|
led_classdev_unregister(*(struct led_classdev **)res);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2019-06-09 18:19:03 +00:00
|
|
|
* devm_led_classdev_register_ext - resource managed led_classdev_register_ext()
|
2017-03-06 05:19:44 +00:00
|
|
|
*
|
|
|
|
* @parent: parent of LED device
|
2015-02-24 00:11:41 +00:00
|
|
|
* @led_cdev: the led_classdev structure for this device.
|
2019-06-09 18:19:03 +00:00
|
|
|
* @init_data: LED class device initialization data
|
2015-02-24 00:11:41 +00:00
|
|
|
*/
|
2019-06-09 18:19:03 +00:00
|
|
|
int devm_led_classdev_register_ext(struct device *parent,
|
|
|
|
struct led_classdev *led_cdev,
|
|
|
|
struct led_init_data *init_data)
|
2015-02-24 00:11:41 +00:00
|
|
|
{
|
|
|
|
struct led_classdev **dr;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
dr = devres_alloc(devm_led_classdev_release, sizeof(*dr), GFP_KERNEL);
|
|
|
|
if (!dr)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2019-06-09 18:19:03 +00:00
|
|
|
rc = led_classdev_register_ext(parent, led_cdev, init_data);
|
2015-02-24 00:11:41 +00:00
|
|
|
if (rc) {
|
|
|
|
devres_free(dr);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
*dr = led_cdev;
|
|
|
|
devres_add(parent, dr);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2019-06-09 18:19:03 +00:00
|
|
|
EXPORT_SYMBOL_GPL(devm_led_classdev_register_ext);
|
2015-02-24 00:11:41 +00:00
|
|
|
|
|
|
|
static int devm_led_classdev_match(struct device *dev, void *res, void *data)
|
|
|
|
{
|
2019-10-02 12:40:41 +00:00
|
|
|
struct led_classdev **p = res;
|
2015-02-24 00:11:41 +00:00
|
|
|
|
|
|
|
if (WARN_ON(!p || !*p))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
return *p == data;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* devm_led_classdev_unregister() - resource managed led_classdev_unregister()
|
|
|
|
* @parent: The device to unregister.
|
|
|
|
* @led_cdev: the led_classdev structure for this device.
|
|
|
|
*/
|
|
|
|
void devm_led_classdev_unregister(struct device *dev,
|
|
|
|
struct led_classdev *led_cdev)
|
|
|
|
{
|
|
|
|
WARN_ON(devres_release(dev,
|
|
|
|
devm_led_classdev_release,
|
|
|
|
devm_led_classdev_match, led_cdev));
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(devm_led_classdev_unregister);
|
|
|
|
|
2006-03-31 10:31:04 +00:00
|
|
|
static int __init leds_init(void)
|
|
|
|
{
|
|
|
|
leds_class = class_create(THIS_MODULE, "leds");
|
|
|
|
if (IS_ERR(leds_class))
|
|
|
|
return PTR_ERR(leds_class);
|
2013-06-20 19:08:44 +00:00
|
|
|
leds_class->pm = &leds_class_dev_pm_ops;
|
2013-07-24 22:05:13 +00:00
|
|
|
leds_class->dev_groups = led_groups;
|
2006-03-31 10:31:04 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit leds_exit(void)
|
|
|
|
{
|
|
|
|
class_destroy(leds_class);
|
|
|
|
}
|
|
|
|
|
|
|
|
subsys_initcall(leds_init);
|
|
|
|
module_exit(leds_exit);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("John Lenz, Richard Purdie");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_DESCRIPTION("LED Class Interface");
|