linux-kernel - [PATCH 1/3] leds:triggers:Extend the kernel panic LED trigger

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Message-Id: <20210906135320.23134-1-chaochao2021666@163.com>
Date:   Mon,  6 Sep 2021 21:53:18 +0800
From:   chaochao2021666@....com
To:     pavel@....cz
Cc:     linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, jan.kiszk@...mens.com,
        464759471@...com, chao zeng <chao.zeng@...mens.com>
Subject: [PATCH 1/3] leds:triggers:Extend the kernel panic LED trigger

From: chao zeng <chao.zeng@...mens.com>

This commit extend panic trigger, add two new panic trigger
"panic_on" and "panic_off" and keep the "panic" compatible with
"panic_blink".

All the led on the "panic_on" would light and on
the "panic_off" would turn off

Expand the panic state of led to meet more requirements

Signed-off-by: chao zeng <chao.zeng@...mens.com>
---
 drivers/leds/trigger/ledtrig-panic.c | 39 ++++++++++++++++++++++------
 1 file changed, 31 insertions(+), 8 deletions(-)

diff --git a/drivers/leds/trigger/ledtrig-panic.c b/drivers/leds/trigger/ledtrig-panic.c
index 64abf2e91608..1274bc94b5dd 100644
--- a/drivers/leds/trigger/ledtrig-panic.c
+++ b/drivers/leds/trigger/ledtrig-panic.c
@@ -12,19 +12,26 @@
 #include <linux/leds.h>
 #include "../leds.h"
 
-static struct led_trigger *trigger;
+enum led_display_type {
+	ON,
+	OFF,
+	BLINK,
+	DISPLAY_TYPE_COUNT,
+};
+
+static struct led_trigger *panic_trigger[DISPLAY_TYPE_COUNT];
 
 /*
  * This is called in a special context by the atomic panic
  * notifier. This means the trigger can be changed without
  * worrying about locking.
  */
-static void led_trigger_set_panic(struct led_classdev *led_cdev)
+static void led_trigger_set_panic(struct led_classdev *led_cdev, const char *type)
 {
 	struct led_trigger *trig;
 
 	list_for_each_entry(trig, &trigger_list, next_trig) {
-		if (strcmp("panic", trig->name))
+		if (strcmp(type, trig->name))
 			continue;
 		if (led_cdev->trigger)
 			list_del(&led_cdev->trig_list);
@@ -37,6 +44,10 @@ static void led_trigger_set_panic(struct led_classdev *led_cdev)
 		led_cdev->trigger = trig;
 		if (trig->activate)
 			trig->activate(led_cdev);
+
+		/*Clear current brightness work*/
+		led_cdev->work_flags = 0;
+
 		break;
 	}
 }
@@ -48,7 +59,12 @@ static int led_trigger_panic_notifier(struct notifier_block *nb,
 
 	list_for_each_entry(led_cdev, &leds_list, node)
 		if (led_cdev->flags & LED_PANIC_INDICATOR)
-			led_trigger_set_panic(led_cdev);
+			led_trigger_set_panic(led_cdev, "panic");
+		else if (led_cdev->flags & LED_PANIC_INDICATOR_ON)
+			led_trigger_set_panic(led_cdev, "panic_on");
+		else if (led_cdev->flags & LED_PANIC_INDICATOR_OFF)
+			led_trigger_set_panic(led_cdev, "panic_off");
+
 	return NOTIFY_DONE;
 }
 
@@ -56,9 +72,12 @@ static struct notifier_block led_trigger_panic_nb = {
 	.notifier_call = led_trigger_panic_notifier,
 };
 
-static long led_panic_blink(int state)
+static long led_panic_activity(int state)
 {
-	led_trigger_event(trigger, state ? LED_FULL : LED_OFF);
+	led_trigger_event(panic_trigger[BLINK], state ? LED_FULL : LED_OFF);
+	led_trigger_event(panic_trigger[ON], LED_FULL);
+	led_trigger_event(panic_trigger[OFF], LED_OFF);
+
 	return 0;
 }
 
@@ -67,8 +86,12 @@ static int __init ledtrig_panic_init(void)
 	atomic_notifier_chain_register(&panic_notifier_list,
 				       &led_trigger_panic_nb);
 
-	led_trigger_register_simple("panic", &trigger);
-	panic_blink = led_panic_blink;
+	led_trigger_register_simple("panic", &panic_trigger[BLINK]);
+	led_trigger_register_simple("panic_on", &panic_trigger[ON]);
+	led_trigger_register_simple("panic_off", &panic_trigger[OFF]);
+
+	panic_blink = led_panic_activity;
+
 	return 0;
 }
 device_initcall(ledtrig_panic_init);
-- 
2.17.1