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Subject[34-longterm 167/209] hwmon: (adm1026) Fix setting fan_div
Date
From: Gabriele Gorla <gorlik@penguintown.net>

=====================================================================
| This is a commit scheduled for the next v2.6.34 longterm release. |
| If you see a problem with using this for longterm, please comment.|
=====================================================================

commit 52bc9802ce849d0d287cc5fe76d06b0daa3986ca upstream.

Prevent setting fan_div from stomping on other fans that share the
same I2C register.

Signed-off-by: Gabriele Gorla <gorlik@penguintown.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
drivers/hwmon/adm1026.c | 16 +++++++++-------
1 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/hwmon/adm1026.c b/drivers/hwmon/adm1026.c
index e059a5f..9975bbf 100644
--- a/drivers/hwmon/adm1026.c
+++ b/drivers/hwmon/adm1026.c
@@ -916,7 +916,7 @@ static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
int nr = sensor_attr->index;
struct i2c_client *client = to_i2c_client(dev);
struct adm1026_data *data = i2c_get_clientdata(client);
- int val, orig_div, new_div, shift;
+ int val, orig_div, new_div;

val = simple_strtol(buf, NULL, 10);
new_div = DIV_TO_REG(val);
@@ -926,15 +926,17 @@ static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
data->fan_div[nr] = DIV_FROM_REG(new_div);

if (nr < 4) { /* 0 <= nr < 4 */
- shift = 2 * nr;
adm1026_write_value(client, ADM1026_REG_FAN_DIV_0_3,
- ((DIV_TO_REG(orig_div) & (~(0x03 << shift))) |
- (new_div << shift)));
+ (DIV_TO_REG(data->fan_div[0]) << 0) |
+ (DIV_TO_REG(data->fan_div[1]) << 2) |
+ (DIV_TO_REG(data->fan_div[2]) << 4) |
+ (DIV_TO_REG(data->fan_div[3]) << 6));
} else { /* 3 < nr < 8 */
- shift = 2 * (nr - 4);
adm1026_write_value(client, ADM1026_REG_FAN_DIV_4_7,
- ((DIV_TO_REG(orig_div) & (~(0x03 << (2 * shift)))) |
- (new_div << shift)));
+ (DIV_TO_REG(data->fan_div[4]) << 0) |
+ (DIV_TO_REG(data->fan_div[5]) << 2) |
+ (DIV_TO_REG(data->fan_div[6]) << 4) |
+ (DIV_TO_REG(data->fan_div[7]) << 6));
}

if (data->fan_div[nr] != orig_div) {
--
1.7.4.4


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