linux-kernel - [PATCH] hwmon: (emc2103) fix unable to change fan pwm1

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Date:   Tue,  7 Jul 2020 19:57:47 +0530
From:   Vishwas M <vishwas.reddy.vr@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Steve Glendinning <steve.glendinning@...well.net>,
        Vishwas M <vishwas.reddy.vr@...il.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] hwmon: (emc2103) fix unable to change fan pwm1_enable attribute

This patch fixes a bug which does not let FAN mode to be changed from
sysfs(pwm1_enable). i.e pwm1_enable can not be set to 3, it will always
remain at 0.

This is caused because the device driver handles the result of
"read_u8_from_i2c(client, REG_FAN_CONF1, &conf_reg)" incorrectly. The
driver thinks an error has occurred if the (result != 0). This has been
fixed by changing the condition to (result < 0).

Signed-off-by: Vishwas M <vishwas.reddy.vr@...il.com>
---
 drivers/hwmon/emc2103.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwmon/emc2103.c b/drivers/hwmon/emc2103.c
index 491a570e8e50..924c02c1631d 100644
--- a/drivers/hwmon/emc2103.c
+++ b/drivers/hwmon/emc2103.c
@@ -443,7 +443,7 @@ static ssize_t pwm1_enable_store(struct device *dev,
 	}
 
 	result = read_u8_from_i2c(client, REG_FAN_CONF1, &conf_reg);
-	if (result) {
+	if (result < 0) {
 		count = result;
 		goto err;
 	}
-- 
2.25.1