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authorJean Delvare <khali@linux-fr.org>2007-06-17 16:09:12 +0200
committerMark M. Hoffman <mhoffman@lightlink.com>2007-07-19 14:22:15 -0400
commit158ce07564b68d4215b9560213a089d6f7c5a4ea (patch)
tree97483b4ab6d8d051164def0429082a8efdb503e2 /drivers/hwmon
parente432dc811bfb6b3d3ad618d99bd8d58132fec316 (diff)
hwmon/w83627ehf: Preserve speed reading when changing fan min
The w83627ehf driver changes the fan clock divider automatically when a new min fan speed is set. It is supposed to preserve the fan speed reading while doing so, bug doesn't really. Fix it. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/w83627ehf.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
index 30a76404f0af..f4d850c71585 100644
--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -716,10 +716,15 @@ store_fan_min(struct device *dev, struct device_attribute *attr,
/* Write both the fan clock divider (if it changed) and the new
fan min (unconditionally) */
if (new_div != data->fan_div[nr]) {
- if (new_div > data->fan_div[nr])
- data->fan[nr] >>= (data->fan_div[nr] - new_div);
- else
- data->fan[nr] <<= (new_div - data->fan_div[nr]);
+ /* Preserve the fan speed reading */
+ if (data->fan[nr] != 0xff) {
+ if (new_div > data->fan_div[nr])
+ data->fan[nr] >>= new_div - data->fan_div[nr];
+ else if (data->fan[nr] & 0x80)
+ data->fan[nr] = 0xff;
+ else
+ data->fan[nr] <<= data->fan_div[nr] - new_div;
+ }
dev_dbg(dev, "fan%u clock divider changed from %u to %u\n",
nr + 1, div_from_reg(data->fan_div[nr]),