linux-kernel - [PATCH 3.12 022/118] hwmon: (w83l786ng) Fix fan speed control mode setting and reporting

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Date:	Wed, 18 Dec 2013 13:10:59 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Brian Carnes <bmcarnes@...il.com>,
	Jean Delvare <khali@...ux-fr.org>
Subject: [PATCH 3.12 022/118] hwmon: (w83l786ng) Fix fan speed control mode setting and reporting

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Brian Carnes <bmcarnes@...il.com>

commit cf7559bc053471f32373d71d04a9aa19e0b48d59 upstream.

The wrong mask is used, which causes some fan speed control modes
(pwmX_enable) to be incorrectly reported, and some modes to be
impossible to set.

[JD: add subject and description.]

Signed-off-by: Brian Carnes <bmcarnes@...il.com>
Signed-off-by: Jean Delvare <khali@...ux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hwmon/w83l786ng.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/hwmon/w83l786ng.c
+++ b/drivers/hwmon/w83l786ng.c
@@ -510,7 +510,7 @@ store_pwm_enable(struct device *dev, str
 	mutex_lock(&data->update_lock);
 	reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
 	data->pwm_enable[nr] = val;
-	reg &= ~(0x02 << W83L786NG_PWM_ENABLE_SHIFT[nr]);
+	reg &= ~(0x03 << W83L786NG_PWM_ENABLE_SHIFT[nr]);
 	reg |= (val - 1) << W83L786NG_PWM_ENABLE_SHIFT[nr];
 	w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
 	mutex_unlock(&data->update_lock);
@@ -776,7 +776,7 @@ static struct w83l786ng_data *w83l786ng_
 			    ((pwmcfg >> W83L786NG_PWM_MODE_SHIFT[i]) & 1)
 			    ? 0 : 1;
 			data->pwm_enable[i] =
-			    ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 2) + 1;
+			    ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 3) + 1;
 			data->pwm[i] = w83l786ng_read_value(client,
 			    W83L786NG_REG_PWM[i]);
 		}


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