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authorRichard Cochran <rcochran@linutronix.de>2016-07-13 17:16:45 +0000
committerIngo Molnar <mingo@kernel.org>2016-07-15 10:40:26 +0200
commit911a359de96d5e9d24f50c74a48c6f3cf061539a (patch)
treee4e742e35ead6963da60b395ac59a56976c1ac39 /drivers/leds
parent2dab90932fd08f101a45acc0495ccd77b869da5d (diff)
downloadop-kernel-dev-911a359de96d5e9d24f50c74a48c6f3cf061539a.zip
op-kernel-dev-911a359de96d5e9d24f50c74a48c6f3cf061539a.tar.gz
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>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/trigger/ledtrig-cpu.c32
1 files changed, 15 insertions, 17 deletions
diff --git a/drivers/leds/trigger/ledtrig-cpu.c b/drivers/leds/trigger/ledtrig-cpu.c
index 938467f..4a6a182 100644
--- a/drivers/leds/trigger/ledtrig-cpu.c
+++ b/drivers/leds/trigger/ledtrig-cpu.c
@@ -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");
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