linux-kernel - [PATCH 2/3] hwmon: (nct6775) Fix logic error for PWM enable

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Date:   Thu, 16 Nov 2023 10:23:29 +0800
From:   Xing Tong Wu <xingtong_wu@....com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     xingtong.wu@...mens.com, tobias.schaffner@...mens.com,
        gerd.haeussler.ext@...mens.com
Subject: [PATCH 2/3] hwmon: (nct6775) Fix logic error for PWM enable

From: Xing Tong Wu <xingtong.wu@...mens.com>

The determination of the "pwm_enable" should be based solely on the mode,
regardless of the pwm value.
According to the specification, the default values for pwm and pwm_enable
are 255 and 0 respectively. However, there is a bug in the code where the
fan control is actually enabled, but the file "pwm_enable" incorrectly
displays "off", indicating that fan control is disabled. This contradiction
needs to be addressed and resolved.
Solution: Update the logic so that "pwm_enable" is determined by mode + 1,
remove the "off" value for "pwm_enable" since it is not specified in the
documentation.

Signed-off-by: Xing Tong Wu <xingtong.wu@...mens.com>
---
 drivers/hwmon/nct6775-core.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/hwmon/nct6775-core.c b/drivers/hwmon/nct6775-core.c
index 2111f0cd9787..575db6cb96e9 100644
--- a/drivers/hwmon/nct6775-core.c
+++ b/drivers/hwmon/nct6775-core.c
@@ -900,8 +900,6 @@ static const u16 NCT6116_REG_TSI_TEMP[] = { 0x59, 0x5b };

 static enum pwm_enable reg_to_pwm_enable(int pwm, int mode)
 {
-	if (mode == 0 && pwm == 255)
-		return off;
 	return mode + 1;
 }

-- 
2.25.1