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authorGuenter Roeck <guenter.roeck@ericsson.com>2011-02-13 13:08:23 -0800
committerGuenter Roeck <guenter.roeck@ericsson.com>2011-03-14 22:39:18 -0700
commit3382a918da968318a4284a14b3dee4a38f8a6749 (patch)
tree4fce52cfcf9632362714fc03a5bcfd2785494759 /drivers/hwmon/w83627ehf.c
parent26bc440e3f14df5daff4d1ff0f37de5e260cea18 (diff)
downloadlinux-3382a918da968318a4284a14b3dee4a38f8a6749.tar.bz2
hwmon: (w83627ehf) Store rpm instead of raw fan speed data
Since the fan speed value can be above 0xff, we can no longer use that value to determine if the fan speed reading is valid. This makes it difficult to manipulate the stored fan speed register value. If we store rpm instead of the fan speed register value, we do not need to correct it if the fan divisor value is changed, and the above mentioned problem no longer exists. Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Acked-by: Ian Dobson <i.dobson@planet-ian.com>
Diffstat (limited to 'drivers/hwmon/w83627ehf.c')
-rw-r--r--drivers/hwmon/w83627ehf.c27
1 files changed, 9 insertions, 18 deletions
diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
index df6e50260e01..460292bad74a 100644
--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -452,7 +452,7 @@ struct w83627ehf_data {
u8 in[10]; /* Register value */
u8 in_max[10]; /* Register value */
u8 in_min[10]; /* Register value */
- u16 fan[5];
+ unsigned int rpm[5];
u16 fan_min[5];
u8 fan_div[5];
u8 has_fan; /* some fan inputs can be disabled */
@@ -775,11 +775,14 @@ static struct w83627ehf_data *w83627ehf_update_device(struct device *dev)
/* Measured fan speeds and limits */
for (i = 0; i < 5; i++) {
+ u16 reg;
+
if (!(data->has_fan & (1 << i)))
continue;
- data->fan[i] = w83627ehf_read_value(data,
- data->REG_FAN[i]);
+ reg = w83627ehf_read_value(data, data->REG_FAN[i]);
+ data->rpm[i] = data->fan_from_reg(reg,
+ data->fan_div[i]);
if (data->has_fan_min & (1 << i))
data->fan_min[i] = w83627ehf_read_value(data,
@@ -789,9 +792,8 @@ static struct w83627ehf_data *w83627ehf_update_device(struct device *dev)
divider can be increased, let's try that for next
time */
if (data->has_fan_div
- && (data->fan[i] >= 0xff
- || (sio_data->kind == nct6775
- && data->fan[i] == 0x00))
+ && (reg >= 0xff || (sio_data->kind == nct6775
+ && reg == 0x00))
&& data->fan_div[i] < 0x07) {
dev_dbg(dev, "Increasing fan%d "
"clock divider from %u to %u\n",
@@ -984,8 +986,7 @@ show_fan(struct device *dev, struct device_attribute *attr, char *buf)
struct w83627ehf_data *data = w83627ehf_update_device(dev);
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
- return sprintf(buf, "%d\n",
- data->fan_from_reg(data->fan[nr], data->fan_div[nr]));
+ return sprintf(buf, "%d\n", data->rpm[nr]);
}
static ssize_t
@@ -1078,16 +1079,6 @@ 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]) {
- /* 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]),
div_from_reg(new_div));