linux-kernel - [PATCH V2] Input: atkbd - fix LED state at suspend/resume

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Message-Id: <20240802093600.6807-1-maqianga@uniontech.com>
Date: Fri,  2 Aug 2024 17:36:00 +0800
From: Qiang Ma <maqianga@...ontech.com>
To: dmitry.torokhov@...il.com,
	hdegoede@...hat.com,
	christophe.jaillet@...adoo.fr
Cc: linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Qiang Ma <maqianga@...ontech.com>
Subject: [PATCH V2] Input: atkbd - fix LED state at suspend/resume

After we turn on the keyboard CAPSL LED and let the system suspend,
the keyboard LED is not off, and the kernel log is as follows:

[  185.987574] i8042: [44060] ed -> i8042 (kbd-data)
[  185.988057] i8042: [44061] ** <- i8042 (interrupt, 0, 1)
[  185.988067] i8042: [44061] 04 -> i8042 (kbd-data)
[  185.988248] i8042: [44061] ** <- i8042 (interrupt, 0, 1)

The log shows that after the command 0xed is sent, the data
sent is 0x04 instead of 0x00.

Solution:
Add a bitmap variable ledon in the atkbd structure, and then set ledon
according to code-value in the event, in the atkbd_set_leds() function,
first look at the value of ledon, if it is 0, there is no need to
look at the value of dev->led, otherwise, need to look at dev->led
to determine the keyboard LED on/off.

Signed-off-by: Qiang Ma <maqianga@...ontech.com>
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
V2:
 - Fixed formatting and spelling errors
 - Optimized some code

 drivers/input/keyboard/atkbd.c | 31 +++++++++++++++++++++++--------
 1 file changed, 23 insertions(+), 8 deletions(-)

diff --git a/drivers/input/keyboard/atkbd.c b/drivers/input/keyboard/atkbd.c
index 7f67f9f2946b..fb479bc78134 100644
--- a/drivers/input/keyboard/atkbd.c
+++ b/drivers/input/keyboard/atkbd.c
@@ -237,6 +237,8 @@ struct atkbd {
 	struct mutex mutex;
 
 	struct vivaldi_data vdata;
+
+	DECLARE_BITMAP(ledon, LED_CNT);
 };
 
 /*
@@ -604,24 +606,32 @@ static int atkbd_set_repeat_rate(struct atkbd *atkbd)
 	return ps2_command(&atkbd->ps2dev, &param, ATKBD_CMD_SETREP);
 }
 
+#define ATKBD_DO_LED_TOGGLE(dev, atkbd, type, v, bits, on)		\
+({									\
+	unsigned char __tmp = 0;					\
+	if (test_bit(LED_##type, atkbd->on))				\
+		__tmp = test_bit(LED_##type, dev->bits) ? v : 0;	\
+	__tmp;								\
+})
+
 static int atkbd_set_leds(struct atkbd *atkbd)
 {
 	struct input_dev *dev = atkbd->dev;
 	unsigned char param[2];
 
-	param[0] = (test_bit(LED_SCROLLL, dev->led) ? 1 : 0)
-		 | (test_bit(LED_NUML,    dev->led) ? 2 : 0)
-		 | (test_bit(LED_CAPSL,   dev->led) ? 4 : 0);
+	param[0] = ATKBD_DO_LED_TOGGLE(dev, atkbd, SCROLLL, 1, led, ledon)
+		 | ATKBD_DO_LED_TOGGLE(dev, atkbd, NUML,    2, led, ledon)
+		 | ATKBD_DO_LED_TOGGLE(dev, atkbd, CAPSL,   4, led, ledon);
 	if (ps2_command(&atkbd->ps2dev, param, ATKBD_CMD_SETLEDS))
 		return -1;
 
 	if (atkbd->extra) {
 		param[0] = 0;
-		param[1] = (test_bit(LED_COMPOSE, dev->led) ? 0x01 : 0)
-			 | (test_bit(LED_SLEEP,   dev->led) ? 0x02 : 0)
-			 | (test_bit(LED_SUSPEND, dev->led) ? 0x04 : 0)
-			 | (test_bit(LED_MISC,    dev->led) ? 0x10 : 0)
-			 | (test_bit(LED_MUTE,    dev->led) ? 0x20 : 0);
+		param[1] = ATKBD_DO_LED_TOGGLE(dev, atkbd, COMPOSE, 0x01, led, ledon)
+			 | ATKBD_DO_LED_TOGGLE(dev, atkbd, SLEEP,   0x02, led, ledon)
+			 | ATKBD_DO_LED_TOGGLE(dev, atkbd, SUSPEND, 0x04, led, ledon)
+			 | ATKBD_DO_LED_TOGGLE(dev, atkbd, MISC,    0x10, led, ledon)
+			 | ATKBD_DO_LED_TOGGLE(dev, atkbd, MUTE,    0x20, led, ledon);
 		if (ps2_command(&atkbd->ps2dev, param, ATKBD_CMD_EX_SETLEDS))
 			return -1;
 	}
@@ -695,6 +705,11 @@ static int atkbd_event(struct input_dev *dev,
 	switch (type) {
 
 	case EV_LED:
+		if (value)
+			__set_bit(code, atkbd->ledon);
+		else
+			__clear_bit(code, atkbd->ledon);
+
 		atkbd_schedule_event_work(atkbd, ATKBD_LED_EVENT_BIT);
 		return 0;
 
-- 
2.20.1