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leds/trigger/cpu: Convert to hotplug state machine 

This is a straightforward conversion. We place this callback last
in the list so that the LED illuminates only after a successful
bring up sequence.

( NOTE: The patch adds a FIXME question about the callback used,
        this question should probably be revisited later on.)

Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-leds@vger.kernel.org
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153336.465496902@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Richard Cochran 2016-07-13 17:16:45 +00:00 committed by Ingo Molnar
parent 2dab90932f
commit 911a359de9
2 changed files with 16 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/leds/trigger/ledtrig-cpu.c
View File

@ -92,25 +92,17 @@ static struct syscore_ops ledtrig_cpu_syscore_ops = {
.resume = ledtrig_cpu_syscore_resume,
};
static int ledtrig_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
static int ledtrig_starting_cpu(unsigned int cpu)
{
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_STARTING:
ledtrig_cpu(CPU_LED_START);
break;
case CPU_DYING:
ledtrig_cpu(CPU_LED_STOP);
break;
}
return NOTIFY_OK;
ledtrig_cpu(CPU_LED_START);
return 0;
}
static struct notifier_block ledtrig_cpu_nb = {
.notifier_call = ledtrig_cpu_notify,
};
static int ledtrig_dying_cpu(unsigned int cpu)
{
ledtrig_cpu(CPU_LED_STOP);
return 0;
}
static int __init ledtrig_cpu_init(void)
{
@ -133,7 +125,13 @@ static int __init ledtrig_cpu_init(void)
}
register_syscore_ops(&ledtrig_cpu_syscore_ops);
register_cpu_notifier(&ledtrig_cpu_nb);
/*
* FIXME: Why needs this to happen in the interrupt disabled
* low level bringup phase of a cpu?
*/
cpuhp_setup_state(CPUHP_AP_LEDTRIG_STARTING, "AP_LEDTRIG_STARTING",
ledtrig_starting_cpu, ledtrig_dying_cpu);
pr_info("ledtrig-cpu: registered to indicate activity on CPUs\n");

1
include/linux/cpuhotplug.h
View File

@ -42,6 +42,7 @@ enum cpuhp_state {
CPUHP_AP_QCOM_TIMER_STARTING,
CPUHP_AP_MIPS_GIC_TIMER_STARTING,
CPUHP_AP_KVM_STARTING,
CPUHP_AP_LEDTRIG_STARTING,
CPUHP_AP_NOTIFY_STARTING,
CPUHP_AP_ONLINE,
CPUHP_TEARDOWN_CPU,