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hwmon: (adm1026) Fix setting fan_div 

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

Signed-off-by: Gabriele Gorla <gorlik@penguintown.net>
Cc: stable@kernel.org
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Gabriele Gorla 2010-12-08 16:27:22 +01:00 committed by Jean Delvare
parent 6229cdb236
commit 52bc9802ce
1 changed files with 9 additions and 7 deletions
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16
drivers/hwmon/adm1026.c
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@ -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);
@ -928,15 +928,17 @@ 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) {