From 3382a918da968318a4284a14b3dee4a38f8a6749 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Sun, 13 Feb 2011 13:08:23 -0800 Subject: [PATCH] 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 Acked-by: Ian Dobson --- drivers/hwmon/w83627ehf.c | 27 +++++++++------------------ 1 file changed, 9 insertions(+), 18 deletions(-) diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c index df6e50260e0..460292bad74 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)); -- 2.11.4.GIT