redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

iio: humidity: hts221: refactor write_with_mask code 

Move bit-shift in hts221_write_with_mask() instead of coding
the shift depth in the configured value. That change will be necessary
to fix an issue in device power-down procedure.
Simplify hts221_avg_list table management

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
hifive-unleashed-5.1
Lorenzo Bianconi 2017-07-17 19:38:56 +02:00 committed by Jonathan Cameron
parent a94c24a712
commit bd49302a73
2 changed files with 42 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/iio/humidity/hts221.h
View File

@ -30,12 +30,6 @@ struct hts221_transfer_function {
int (*write)(struct device *dev, u8 addr, int len, u8 *data);
};
#define HTS221_AVG_DEPTH 8
struct hts221_avg_avl {
u16 avg;
u8 val;
};
enum hts221_sensor_type {
HTS221_SENSOR_H,
HTS221_SENSOR_T,

94
drivers/iio/humidity/hts221_core.c
View File

@ -32,30 +32,12 @@
#define HTS221_HUMIDITY_AVG_MASK 0x07
#define HTS221_TEMP_AVG_MASK 0x38
#define HTS221_ODR_MASK 0x87
#define HTS221_ODR_MASK 0x03
#define HTS221_BDU_MASK BIT(2)
#define HTS221_ENABLE_MASK BIT(7)
#define HTS221_DRDY_MASK BIT(2)
#define HTS221_ENABLE_SENSOR BIT(7)
#define HTS221_HUMIDITY_AVG_4 0x00 /* 0.4 %RH */
#define HTS221_HUMIDITY_AVG_8 0x01 /* 0.3 %RH */
#define HTS221_HUMIDITY_AVG_16 0x02 /* 0.2 %RH */
#define HTS221_HUMIDITY_AVG_32 0x03 /* 0.15 %RH */
#define HTS221_HUMIDITY_AVG_64 0x04 /* 0.1 %RH */
#define HTS221_HUMIDITY_AVG_128 0x05 /* 0.07 %RH */
#define HTS221_HUMIDITY_AVG_256 0x06 /* 0.05 %RH */
#define HTS221_HUMIDITY_AVG_512 0x07 /* 0.03 %RH */
#define HTS221_TEMP_AVG_2 0x00 /* 0.08 degC */
#define HTS221_TEMP_AVG_4 0x08 /* 0.05 degC */
#define HTS221_TEMP_AVG_8 0x10 /* 0.04 degC */
#define HTS221_TEMP_AVG_16 0x18 /* 0.03 degC */
#define HTS221_TEMP_AVG_32 0x20 /* 0.02 degC */
#define HTS221_TEMP_AVG_64 0x28 /* 0.015 degC */
#define HTS221_TEMP_AVG_128 0x30 /* 0.01 degC */
#define HTS221_TEMP_AVG_256 0x38 /* 0.007 degC */
/* calibration registers */
#define HTS221_REG_0RH_CAL_X_H 0x36
@ -73,10 +55,11 @@ struct hts221_odr {
u8 val;
};
#define HTS221_AVG_DEPTH 8
struct hts221_avg {
u8 addr;
u8 mask;
struct hts221_avg_avl avg_avl[HTS221_AVG_DEPTH];
u16 avg_avl[HTS221_AVG_DEPTH];
};
static const struct hts221_odr hts221_odr_table[] = {
@ -90,28 +73,28 @@ static const struct hts221_avg hts221_avg_list[] = {
.addr = HTS221_REG_AVG_ADDR,
.mask = HTS221_HUMIDITY_AVG_MASK,
.avg_avl = {
{ 4, HTS221_HUMIDITY_AVG_4 },
{ 8, HTS221_HUMIDITY_AVG_8 },
{ 16, HTS221_HUMIDITY_AVG_16 },
{ 32, HTS221_HUMIDITY_AVG_32 },
{ 64, HTS221_HUMIDITY_AVG_64 },
{ 128, HTS221_HUMIDITY_AVG_128 },
{ 256, HTS221_HUMIDITY_AVG_256 },
{ 512, HTS221_HUMIDITY_AVG_512 },
4, /* 0.4 %RH */
8, /* 0.3 %RH */
16, /* 0.2 %RH */
32, /* 0.15 %RH */
64, /* 0.1 %RH */
128, /* 0.07 %RH */
256, /* 0.05 %RH */
512, /* 0.03 %RH */
},
},
{
.addr = HTS221_REG_AVG_ADDR,
.mask = HTS221_TEMP_AVG_MASK,
.avg_avl = {
{ 2, HTS221_TEMP_AVG_2 },
{ 4, HTS221_TEMP_AVG_4 },
{ 8, HTS221_TEMP_AVG_8 },
{ 16, HTS221_TEMP_AVG_16 },
{ 32, HTS221_TEMP_AVG_32 },
{ 64, HTS221_TEMP_AVG_64 },
{ 128, HTS221_TEMP_AVG_128 },
{ 256, HTS221_TEMP_AVG_256 },
2, /* 0.08 degC */
4, /* 0.05 degC */
8, /* 0.04 degC */
16, /* 0.03 degC */
32, /* 0.02 degC */
64, /* 0.015 degC */
128, /* 0.01 degC */
256, /* 0.007 degC */
},
},
};
@ -166,7 +149,7 @@ static int hts221_write_with_mask(struct hts221_hw *hw, u8 addr, u8 mask,
goto unlock;
}
data = (data & ~mask) | (val & mask);
data = (data & ~mask) | ((val << __ffs(mask)) & mask);
err = hw->tf->write(hw->dev, addr, sizeof(data), &data);
if (err < 0)
@ -201,11 +184,10 @@ static int hts221_check_whoami(struct hts221_hw *hw)
int hts221_config_drdy(struct hts221_hw *hw, bool enable)
{
u8 val = enable ? BIT(2) : 0;
int err;
err = hts221_write_with_mask(hw, HTS221_REG_CNTRL3_ADDR,
HTS221_DRDY_MASK, val);
HTS221_DRDY_MASK, enable);
return err < 0 ? err : 0;
}
@ -213,7 +195,6 @@ int hts221_config_drdy(struct hts221_hw *hw, bool enable)
static int hts221_update_odr(struct hts221_hw *hw, u8 odr)
{
int i, err;
u8 val;
for (i = 0; i < ARRAY_SIZE(hts221_odr_table); i++)
if (hts221_odr_table[i].hz == odr)
@ -222,9 +203,19 @@ static int hts221_update_odr(struct hts221_hw *hw, u8 odr)
if (i == ARRAY_SIZE(hts221_odr_table))
return -EINVAL;
val = HTS221_ENABLE_SENSOR | HTS221_BDU_MASK | hts221_odr_table[i].val;
/* enable Block Data Update */
err = hts221_write_with_mask(hw, HTS221_REG_CNTRL1_ADDR,
HTS221_ODR_MASK, val);
HTS221_BDU_MASK, 1);
if (err < 0)
return err;
err = hts221_write_with_mask(hw, HTS221_REG_CNTRL1_ADDR,
HTS221_ODR_MASK, hts221_odr_table[i].val);
if (err < 0)
return err;
err = hts221_write_with_mask(hw, HTS221_REG_CNTRL1_ADDR,
HTS221_ENABLE_MASK, 1);
if (err < 0)
return err;
@ -241,14 +232,13 @@ static int hts221_update_avg(struct hts221_hw *hw,
const struct hts221_avg *avg = &hts221_avg_list[type];
for (i = 0; i < HTS221_AVG_DEPTH; i++)
if (avg->avg_avl[i].avg == val)
if (avg->avg_avl[i] == val)
break;
if (i == HTS221_AVG_DEPTH)
return -EINVAL;
err = hts221_write_with_mask(hw, avg->addr, avg->mask,
avg->avg_avl[i].val);
err = hts221_write_with_mask(hw, avg->addr, avg->mask, i);
if (err < 0)
return err;
@ -283,7 +273,7 @@ hts221_sysfs_rh_oversampling_avail(struct device *dev,
for (i = 0; i < ARRAY_SIZE(avg->avg_avl); i++)
len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
avg->avg_avl[i].avg);
avg->avg_avl[i]);
buf[len - 1] = '\n';
return len;
@ -300,7 +290,7 @@ hts221_sysfs_temp_oversampling_avail(struct device *dev,
for (i = 0; i < ARRAY_SIZE(avg->avg_avl); i++)
len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
avg->avg_avl[i].avg);
avg->avg_avl[i]);
buf[len - 1] = '\n';
return len;
@ -534,13 +524,13 @@ static int hts221_read_raw(struct iio_dev *iio_dev,
case IIO_HUMIDITYRELATIVE:
avg = &hts221_avg_list[HTS221_SENSOR_H];
idx = hw->sensors[HTS221_SENSOR_H].cur_avg_idx;
*val = avg->avg_avl[idx].avg;
*val = avg->avg_avl[idx];
ret = IIO_VAL_INT;
break;
case IIO_TEMP:
avg = &hts221_avg_list[HTS221_SENSOR_T];
idx = hw->sensors[HTS221_SENSOR_T].cur_avg_idx;
*val = avg->avg_avl[idx].avg;
*val = avg->avg_avl[idx];
ret = IIO_VAL_INT;
break;
default:
@ -661,7 +651,7 @@ int hts221_probe(struct iio_dev *iio_dev)
return err;
}
data = hts221_avg_list[HTS221_SENSOR_H].avg_avl[3].avg;
data = hts221_avg_list[HTS221_SENSOR_H].avg_avl[3];
err = hts221_update_avg(hw, HTS221_SENSOR_H, data);
if (err < 0) {
dev_err(hw->dev, "failed to set rh oversampling ratio\n");
@ -676,7 +666,7 @@ int hts221_probe(struct iio_dev *iio_dev)
return err;
}
data = hts221_avg_list[HTS221_SENSOR_T].avg_avl[3].avg;
data = hts221_avg_list[HTS221_SENSOR_T].avg_avl[3];
err = hts221_update_avg(hw, HTS221_SENSOR_T, data);
if (err < 0) {
dev_err(hw->dev,