diff options
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/lm85.c | 32 |
1 files changed, 12 insertions, 20 deletions
diff --git a/drivers/hwmon/lm85.c b/drivers/hwmon/lm85.c index 3b70815ab982..0c61fa36c83c 100644 --- a/drivers/hwmon/lm85.c +++ b/drivers/hwmon/lm85.c @@ -139,10 +139,10 @@ static int lm85_scaling[] = { /* .001 Volts */ #define INS_TO_REG(n,val) \ SENSORS_LIMIT(SCALE(val,lm85_scaling[n],192),0,255) -#define INSEXT_FROM_REG(n,val,ext,scale) \ - SCALE((val)*(scale) + (ext),192*(scale),lm85_scaling[n]) +#define INSEXT_FROM_REG(n,val,ext) \ + SCALE(((val) << 4) + (ext), 192 << 4, lm85_scaling[n]) -#define INS_FROM_REG(n,val) INSEXT_FROM_REG(n,val,0,1) +#define INS_FROM_REG(n,val) SCALE((val), 192, lm85_scaling[n]) /* FAN speed is measured using 90kHz clock */ #define FAN_TO_REG(val) (SENSORS_LIMIT( (val)<=0?0: 5400000/(val),0,65534)) @@ -151,10 +151,9 @@ static int lm85_scaling[] = { /* .001 Volts */ /* Temperature is reported in .001 degC increments */ #define TEMP_TO_REG(val) \ SENSORS_LIMIT(SCALE(val,1000,1),-127,127) -#define TEMPEXT_FROM_REG(val,ext,scale) \ - SCALE((val)*scale + (ext),scale,1000) -#define TEMP_FROM_REG(val) \ - TEMPEXT_FROM_REG(val,0,1) +#define TEMPEXT_FROM_REG(val,ext) \ + SCALE(((val) << 4) + (ext), 16, 1000) +#define TEMP_FROM_REG(val) ((val) * 1000) #define PWM_TO_REG(val) (SENSORS_LIMIT(val,0,255)) #define PWM_FROM_REG(val) (val) @@ -334,7 +333,6 @@ struct lm85_data { u8 tach_mode; /* Register encoding, combined */ u8 temp_ext[3]; /* Decoded values */ u8 in_ext[8]; /* Decoded values */ - u8 adc_scale; /* ADC Extended bits scaling factor */ u8 fan_ppr; /* Register value */ u8 smooth[3]; /* Register encoding */ u8 vid; /* Register value */ @@ -541,8 +539,7 @@ static ssize_t show_in(struct device *dev, struct device_attribute *attr, struct lm85_data *data = lm85_update_device(dev); return sprintf( buf, "%d\n", INSEXT_FROM_REG(nr, data->in[nr], - data->in_ext[nr], - data->adc_scale) ); + data->in_ext[nr])); } static ssize_t show_in_min(struct device *dev, struct device_attribute *attr, @@ -616,8 +613,7 @@ static ssize_t show_temp(struct device *dev, struct device_attribute *attr, int nr = to_sensor_dev_attr(attr)->index; struct lm85_data *data = lm85_update_device(dev); return sprintf(buf,"%d\n", TEMPEXT_FROM_REG(data->temp[nr], - data->temp_ext[nr], - data->adc_scale) ); + data->temp_ext[nr])); } static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr, @@ -1394,6 +1390,8 @@ static struct lm85_data *lm85_update_device(struct device *dev) /* Have to read extended bits first to "freeze" the * more significant bits that are read later. + * There are 2 additional resolution bits per channel and we + * have room for 4, so we shift them to the left. */ if ( (data->type == adm1027) || (data->type == adt7463) ) { int ext1 = lm85_read_value(client, @@ -1403,18 +1401,12 @@ static struct lm85_data *lm85_update_device(struct device *dev) int val = (ext1 << 8) + ext2; for(i = 0; i <= 4; i++) - data->in_ext[i] = (val>>(i * 2))&0x03; + data->in_ext[i] = ((val>>(i * 2))&0x03) << 2; for(i = 0; i <= 2; i++) - data->temp_ext[i] = (val>>((i + 5) * 2))&0x03; + data->temp_ext[i] = (val>>((i + 4) * 2))&0x0c; } - /* adc_scale is 2^(number of LSBs). There are 4 extra bits in - the emc6d102 and 2 in the adt7463 and adm1027. In all - other chips ext is always 0 and the value of scale is - irrelevant. So it is left in 4*/ - data->adc_scale = (data->type == emc6d102 ) ? 16 : 4; - data->vid = lm85_read_value(client, LM85_REG_VID); for (i = 0; i <= 3; ++i) { |