703 lines
15 KiB
C
703 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* STMicroelectronics hts221 sensor driver
|
|
*
|
|
* Copyright 2016 STMicroelectronics Inc.
|
|
*
|
|
* Lorenzo Bianconi <lorenzo.bianconi@st.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/device.h>
|
|
#include <linux/iio/sysfs.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/bitfield.h>
|
|
|
|
#include "hts221.h"
|
|
|
|
#define HTS221_REG_WHOAMI_ADDR 0x0f
|
|
#define HTS221_REG_WHOAMI_VAL 0xbc
|
|
|
|
#define HTS221_REG_CNTRL1_ADDR 0x20
|
|
#define HTS221_REG_CNTRL2_ADDR 0x21
|
|
|
|
#define HTS221_ODR_MASK 0x03
|
|
#define HTS221_BDU_MASK BIT(2)
|
|
#define HTS221_ENABLE_MASK BIT(7)
|
|
|
|
/* calibration registers */
|
|
#define HTS221_REG_0RH_CAL_X_H 0x36
|
|
#define HTS221_REG_1RH_CAL_X_H 0x3a
|
|
#define HTS221_REG_0RH_CAL_Y_H 0x30
|
|
#define HTS221_REG_1RH_CAL_Y_H 0x31
|
|
#define HTS221_REG_0T_CAL_X_L 0x3c
|
|
#define HTS221_REG_1T_CAL_X_L 0x3e
|
|
#define HTS221_REG_0T_CAL_Y_H 0x32
|
|
#define HTS221_REG_1T_CAL_Y_H 0x33
|
|
#define HTS221_REG_T1_T0_CAL_Y_H 0x35
|
|
|
|
struct hts221_odr {
|
|
u8 hz;
|
|
u8 val;
|
|
};
|
|
|
|
#define HTS221_AVG_DEPTH 8
|
|
struct hts221_avg {
|
|
u8 addr;
|
|
u8 mask;
|
|
u16 avg_avl[HTS221_AVG_DEPTH];
|
|
};
|
|
|
|
static const struct hts221_odr hts221_odr_table[] = {
|
|
{ 1, 0x01 }, /* 1Hz */
|
|
{ 7, 0x02 }, /* 7Hz */
|
|
{ 13, 0x03 }, /* 12.5Hz */
|
|
};
|
|
|
|
static const struct hts221_avg hts221_avg_list[] = {
|
|
{
|
|
.addr = 0x10,
|
|
.mask = 0x07,
|
|
.avg_avl = {
|
|
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 = 0x10,
|
|
.mask = 0x38,
|
|
.avg_avl = {
|
|
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 */
|
|
},
|
|
},
|
|
};
|
|
|
|
static const struct iio_chan_spec hts221_channels[] = {
|
|
{
|
|
.type = IIO_HUMIDITYRELATIVE,
|
|
.address = 0x28,
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
|
|
BIT(IIO_CHAN_INFO_OFFSET) |
|
|
BIT(IIO_CHAN_INFO_SCALE) |
|
|
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
|
|
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
|
|
.scan_index = 0,
|
|
.scan_type = {
|
|
.sign = 's',
|
|
.realbits = 16,
|
|
.storagebits = 16,
|
|
.endianness = IIO_LE,
|
|
},
|
|
},
|
|
{
|
|
.type = IIO_TEMP,
|
|
.address = 0x2a,
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
|
|
BIT(IIO_CHAN_INFO_OFFSET) |
|
|
BIT(IIO_CHAN_INFO_SCALE) |
|
|
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
|
|
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
|
|
.scan_index = 1,
|
|
.scan_type = {
|
|
.sign = 's',
|
|
.realbits = 16,
|
|
.storagebits = 16,
|
|
.endianness = IIO_LE,
|
|
},
|
|
},
|
|
IIO_CHAN_SOFT_TIMESTAMP(2),
|
|
};
|
|
|
|
static int hts221_check_whoami(struct hts221_hw *hw)
|
|
{
|
|
int err, data;
|
|
|
|
err = regmap_read(hw->regmap, HTS221_REG_WHOAMI_ADDR, &data);
|
|
if (err < 0) {
|
|
dev_err(hw->dev, "failed to read whoami register\n");
|
|
return err;
|
|
}
|
|
|
|
if (data != HTS221_REG_WHOAMI_VAL) {
|
|
dev_err(hw->dev, "wrong whoami {%02x vs %02x}\n",
|
|
data, HTS221_REG_WHOAMI_VAL);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hts221_update_odr(struct hts221_hw *hw, u8 odr)
|
|
{
|
|
int i, err;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(hts221_odr_table); i++)
|
|
if (hts221_odr_table[i].hz == odr)
|
|
break;
|
|
|
|
if (i == ARRAY_SIZE(hts221_odr_table))
|
|
return -EINVAL;
|
|
|
|
err = regmap_update_bits(hw->regmap, HTS221_REG_CNTRL1_ADDR,
|
|
HTS221_ODR_MASK,
|
|
FIELD_PREP(HTS221_ODR_MASK,
|
|
hts221_odr_table[i].val));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
hw->odr = odr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hts221_update_avg(struct hts221_hw *hw,
|
|
enum hts221_sensor_type type,
|
|
u16 val)
|
|
{
|
|
const struct hts221_avg *avg = &hts221_avg_list[type];
|
|
int i, err, data;
|
|
|
|
for (i = 0; i < HTS221_AVG_DEPTH; i++)
|
|
if (avg->avg_avl[i] == val)
|
|
break;
|
|
|
|
if (i == HTS221_AVG_DEPTH)
|
|
return -EINVAL;
|
|
|
|
data = ((i << __ffs(avg->mask)) & avg->mask);
|
|
err = regmap_update_bits(hw->regmap, avg->addr,
|
|
avg->mask, data);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
hw->sensors[type].cur_avg_idx = i;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t hts221_sysfs_sampling_freq(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
int i;
|
|
ssize_t len = 0;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(hts221_odr_table); i++)
|
|
len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
|
|
hts221_odr_table[i].hz);
|
|
buf[len - 1] = '\n';
|
|
|
|
return len;
|
|
}
|
|
|
|
static ssize_t
|
|
hts221_sysfs_rh_oversampling_avail(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
const struct hts221_avg *avg = &hts221_avg_list[HTS221_SENSOR_H];
|
|
ssize_t len = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(avg->avg_avl); i++)
|
|
len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
|
|
avg->avg_avl[i]);
|
|
buf[len - 1] = '\n';
|
|
|
|
return len;
|
|
}
|
|
|
|
static ssize_t
|
|
hts221_sysfs_temp_oversampling_avail(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
const struct hts221_avg *avg = &hts221_avg_list[HTS221_SENSOR_T];
|
|
ssize_t len = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(avg->avg_avl); i++)
|
|
len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
|
|
avg->avg_avl[i]);
|
|
buf[len - 1] = '\n';
|
|
|
|
return len;
|
|
}
|
|
|
|
int hts221_set_enable(struct hts221_hw *hw, bool enable)
|
|
{
|
|
int err;
|
|
|
|
err = regmap_update_bits(hw->regmap, HTS221_REG_CNTRL1_ADDR,
|
|
HTS221_ENABLE_MASK,
|
|
FIELD_PREP(HTS221_ENABLE_MASK, enable));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
hw->enabled = enable;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hts221_parse_temp_caldata(struct hts221_hw *hw)
|
|
{
|
|
int err, *slope, *b_gen, cal0, cal1;
|
|
s16 cal_x0, cal_x1, cal_y0, cal_y1;
|
|
__le16 val;
|
|
|
|
err = regmap_read(hw->regmap, HTS221_REG_0T_CAL_Y_H, &cal0);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = regmap_read(hw->regmap, HTS221_REG_T1_T0_CAL_Y_H, &cal1);
|
|
if (err < 0)
|
|
return err;
|
|
cal_y0 = ((cal1 & 0x3) << 8) | cal0;
|
|
|
|
err = regmap_read(hw->regmap, HTS221_REG_1T_CAL_Y_H, &cal0);
|
|
if (err < 0)
|
|
return err;
|
|
cal_y1 = (((cal1 & 0xc) >> 2) << 8) | cal0;
|
|
|
|
err = regmap_bulk_read(hw->regmap, HTS221_REG_0T_CAL_X_L,
|
|
&val, sizeof(val));
|
|
if (err < 0)
|
|
return err;
|
|
cal_x0 = le16_to_cpu(val);
|
|
|
|
err = regmap_bulk_read(hw->regmap, HTS221_REG_1T_CAL_X_L,
|
|
&val, sizeof(val));
|
|
if (err < 0)
|
|
return err;
|
|
cal_x1 = le16_to_cpu(val);
|
|
|
|
slope = &hw->sensors[HTS221_SENSOR_T].slope;
|
|
b_gen = &hw->sensors[HTS221_SENSOR_T].b_gen;
|
|
|
|
*slope = ((cal_y1 - cal_y0) * 8000) / (cal_x1 - cal_x0);
|
|
*b_gen = (((s32)cal_x1 * cal_y0 - (s32)cal_x0 * cal_y1) * 1000) /
|
|
(cal_x1 - cal_x0);
|
|
*b_gen *= 8;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hts221_parse_rh_caldata(struct hts221_hw *hw)
|
|
{
|
|
int err, *slope, *b_gen, data;
|
|
s16 cal_x0, cal_x1, cal_y0, cal_y1;
|
|
__le16 val;
|
|
|
|
err = regmap_read(hw->regmap, HTS221_REG_0RH_CAL_Y_H, &data);
|
|
if (err < 0)
|
|
return err;
|
|
cal_y0 = data;
|
|
|
|
err = regmap_read(hw->regmap, HTS221_REG_1RH_CAL_Y_H, &data);
|
|
if (err < 0)
|
|
return err;
|
|
cal_y1 = data;
|
|
|
|
err = regmap_bulk_read(hw->regmap, HTS221_REG_0RH_CAL_X_H,
|
|
&val, sizeof(val));
|
|
if (err < 0)
|
|
return err;
|
|
cal_x0 = le16_to_cpu(val);
|
|
|
|
err = regmap_bulk_read(hw->regmap, HTS221_REG_1RH_CAL_X_H,
|
|
&val, sizeof(val));
|
|
if (err < 0)
|
|
return err;
|
|
cal_x1 = le16_to_cpu(val);
|
|
|
|
slope = &hw->sensors[HTS221_SENSOR_H].slope;
|
|
b_gen = &hw->sensors[HTS221_SENSOR_H].b_gen;
|
|
|
|
*slope = ((cal_y1 - cal_y0) * 8000) / (cal_x1 - cal_x0);
|
|
*b_gen = (((s32)cal_x1 * cal_y0 - (s32)cal_x0 * cal_y1) * 1000) /
|
|
(cal_x1 - cal_x0);
|
|
*b_gen *= 8;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hts221_get_sensor_scale(struct hts221_hw *hw,
|
|
enum iio_chan_type ch_type,
|
|
int *val, int *val2)
|
|
{
|
|
s64 tmp;
|
|
s32 rem, div, data;
|
|
|
|
switch (ch_type) {
|
|
case IIO_HUMIDITYRELATIVE:
|
|
data = hw->sensors[HTS221_SENSOR_H].slope;
|
|
div = (1 << 4) * 1000;
|
|
break;
|
|
case IIO_TEMP:
|
|
data = hw->sensors[HTS221_SENSOR_T].slope;
|
|
div = (1 << 6) * 1000;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
tmp = div_s64(data * 1000000000LL, div);
|
|
tmp = div_s64_rem(tmp, 1000000000LL, &rem);
|
|
|
|
*val = tmp;
|
|
*val2 = rem;
|
|
|
|
return IIO_VAL_INT_PLUS_NANO;
|
|
}
|
|
|
|
static int hts221_get_sensor_offset(struct hts221_hw *hw,
|
|
enum iio_chan_type ch_type,
|
|
int *val, int *val2)
|
|
{
|
|
s64 tmp;
|
|
s32 rem, div, data;
|
|
|
|
switch (ch_type) {
|
|
case IIO_HUMIDITYRELATIVE:
|
|
data = hw->sensors[HTS221_SENSOR_H].b_gen;
|
|
div = hw->sensors[HTS221_SENSOR_H].slope;
|
|
break;
|
|
case IIO_TEMP:
|
|
data = hw->sensors[HTS221_SENSOR_T].b_gen;
|
|
div = hw->sensors[HTS221_SENSOR_T].slope;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
tmp = div_s64(data * 1000000000LL, div);
|
|
tmp = div_s64_rem(tmp, 1000000000LL, &rem);
|
|
|
|
*val = tmp;
|
|
*val2 = rem;
|
|
|
|
return IIO_VAL_INT_PLUS_NANO;
|
|
}
|
|
|
|
static int hts221_read_oneshot(struct hts221_hw *hw, u8 addr, int *val)
|
|
{
|
|
__le16 data;
|
|
int err;
|
|
|
|
err = hts221_set_enable(hw, true);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
msleep(50);
|
|
|
|
err = regmap_bulk_read(hw->regmap, addr, &data, sizeof(data));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
hts221_set_enable(hw, false);
|
|
|
|
*val = (s16)le16_to_cpu(data);
|
|
|
|
return IIO_VAL_INT;
|
|
}
|
|
|
|
static int hts221_read_raw(struct iio_dev *iio_dev,
|
|
struct iio_chan_spec const *ch,
|
|
int *val, int *val2, long mask)
|
|
{
|
|
struct hts221_hw *hw = iio_priv(iio_dev);
|
|
int ret;
|
|
|
|
ret = iio_device_claim_direct_mode(iio_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
ret = hts221_read_oneshot(hw, ch->address, val);
|
|
break;
|
|
case IIO_CHAN_INFO_SCALE:
|
|
ret = hts221_get_sensor_scale(hw, ch->type, val, val2);
|
|
break;
|
|
case IIO_CHAN_INFO_OFFSET:
|
|
ret = hts221_get_sensor_offset(hw, ch->type, val, val2);
|
|
break;
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
*val = hw->odr;
|
|
ret = IIO_VAL_INT;
|
|
break;
|
|
case IIO_CHAN_INFO_OVERSAMPLING_RATIO: {
|
|
u8 idx;
|
|
const struct hts221_avg *avg;
|
|
|
|
switch (ch->type) {
|
|
case IIO_HUMIDITYRELATIVE:
|
|
avg = &hts221_avg_list[HTS221_SENSOR_H];
|
|
idx = hw->sensors[HTS221_SENSOR_H].cur_avg_idx;
|
|
*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];
|
|
ret = IIO_VAL_INT;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
iio_device_release_direct_mode(iio_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int hts221_write_raw(struct iio_dev *iio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int val, int val2, long mask)
|
|
{
|
|
struct hts221_hw *hw = iio_priv(iio_dev);
|
|
int ret;
|
|
|
|
ret = iio_device_claim_direct_mode(iio_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
ret = hts221_update_odr(hw, val);
|
|
break;
|
|
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
|
|
switch (chan->type) {
|
|
case IIO_HUMIDITYRELATIVE:
|
|
ret = hts221_update_avg(hw, HTS221_SENSOR_H, val);
|
|
break;
|
|
case IIO_TEMP:
|
|
ret = hts221_update_avg(hw, HTS221_SENSOR_T, val);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
iio_device_release_direct_mode(iio_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int hts221_validate_trigger(struct iio_dev *iio_dev,
|
|
struct iio_trigger *trig)
|
|
{
|
|
struct hts221_hw *hw = iio_priv(iio_dev);
|
|
|
|
return hw->trig == trig ? 0 : -EINVAL;
|
|
}
|
|
|
|
static IIO_DEVICE_ATTR(in_humidity_oversampling_ratio_available, S_IRUGO,
|
|
hts221_sysfs_rh_oversampling_avail, NULL, 0);
|
|
static IIO_DEVICE_ATTR(in_temp_oversampling_ratio_available, S_IRUGO,
|
|
hts221_sysfs_temp_oversampling_avail, NULL, 0);
|
|
static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(hts221_sysfs_sampling_freq);
|
|
|
|
static struct attribute *hts221_attributes[] = {
|
|
&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
|
|
&iio_dev_attr_in_humidity_oversampling_ratio_available.dev_attr.attr,
|
|
&iio_dev_attr_in_temp_oversampling_ratio_available.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group hts221_attribute_group = {
|
|
.attrs = hts221_attributes,
|
|
};
|
|
|
|
static const struct iio_info hts221_info = {
|
|
.attrs = &hts221_attribute_group,
|
|
.read_raw = hts221_read_raw,
|
|
.write_raw = hts221_write_raw,
|
|
.validate_trigger = hts221_validate_trigger,
|
|
};
|
|
|
|
static const unsigned long hts221_scan_masks[] = {0x3, 0x0};
|
|
|
|
static int hts221_init_regulators(struct device *dev)
|
|
{
|
|
struct iio_dev *iio_dev = dev_get_drvdata(dev);
|
|
struct hts221_hw *hw = iio_priv(iio_dev);
|
|
int err;
|
|
|
|
hw->vdd = devm_regulator_get(dev, "vdd");
|
|
if (IS_ERR(hw->vdd))
|
|
return dev_err_probe(dev, PTR_ERR(hw->vdd),
|
|
"failed to get vdd regulator\n");
|
|
|
|
err = regulator_enable(hw->vdd);
|
|
if (err) {
|
|
dev_err(dev, "failed to enable vdd regulator: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
msleep(50);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void hts221_chip_uninit(void *data)
|
|
{
|
|
struct hts221_hw *hw = data;
|
|
|
|
regulator_disable(hw->vdd);
|
|
}
|
|
|
|
int hts221_probe(struct device *dev, int irq, const char *name,
|
|
struct regmap *regmap)
|
|
{
|
|
struct iio_dev *iio_dev;
|
|
struct hts221_hw *hw;
|
|
int err;
|
|
u8 data;
|
|
|
|
iio_dev = devm_iio_device_alloc(dev, sizeof(*hw));
|
|
if (!iio_dev)
|
|
return -ENOMEM;
|
|
|
|
dev_set_drvdata(dev, (void *)iio_dev);
|
|
|
|
hw = iio_priv(iio_dev);
|
|
hw->name = name;
|
|
hw->dev = dev;
|
|
hw->irq = irq;
|
|
hw->regmap = regmap;
|
|
|
|
err = hts221_init_regulators(dev);
|
|
if (err)
|
|
return err;
|
|
|
|
err = devm_add_action_or_reset(dev, hts221_chip_uninit, hw);
|
|
if (err)
|
|
return err;
|
|
|
|
err = hts221_check_whoami(hw);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
iio_dev->modes = INDIO_DIRECT_MODE;
|
|
iio_dev->available_scan_masks = hts221_scan_masks;
|
|
iio_dev->channels = hts221_channels;
|
|
iio_dev->num_channels = ARRAY_SIZE(hts221_channels);
|
|
iio_dev->name = HTS221_DEV_NAME;
|
|
iio_dev->info = &hts221_info;
|
|
|
|
/* enable Block Data Update */
|
|
err = regmap_update_bits(hw->regmap, HTS221_REG_CNTRL1_ADDR,
|
|
HTS221_BDU_MASK,
|
|
FIELD_PREP(HTS221_BDU_MASK, 1));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = hts221_update_odr(hw, hts221_odr_table[0].hz);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* configure humidity sensor */
|
|
err = hts221_parse_rh_caldata(hw);
|
|
if (err < 0) {
|
|
dev_err(hw->dev, "failed to get rh calibration data\n");
|
|
return err;
|
|
}
|
|
|
|
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");
|
|
return err;
|
|
}
|
|
|
|
/* configure temperature sensor */
|
|
err = hts221_parse_temp_caldata(hw);
|
|
if (err < 0) {
|
|
dev_err(hw->dev,
|
|
"failed to get temperature calibration data\n");
|
|
return err;
|
|
}
|
|
|
|
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,
|
|
"failed to set temperature oversampling ratio\n");
|
|
return err;
|
|
}
|
|
|
|
if (hw->irq > 0) {
|
|
err = hts221_allocate_buffers(iio_dev);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = hts221_allocate_trigger(iio_dev);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return devm_iio_device_register(hw->dev, iio_dev);
|
|
}
|
|
EXPORT_SYMBOL_NS(hts221_probe, IIO_HTS221);
|
|
|
|
static int hts221_suspend(struct device *dev)
|
|
{
|
|
struct iio_dev *iio_dev = dev_get_drvdata(dev);
|
|
struct hts221_hw *hw = iio_priv(iio_dev);
|
|
|
|
return regmap_update_bits(hw->regmap, HTS221_REG_CNTRL1_ADDR,
|
|
HTS221_ENABLE_MASK,
|
|
FIELD_PREP(HTS221_ENABLE_MASK, false));
|
|
}
|
|
|
|
static int hts221_resume(struct device *dev)
|
|
{
|
|
struct iio_dev *iio_dev = dev_get_drvdata(dev);
|
|
struct hts221_hw *hw = iio_priv(iio_dev);
|
|
int err = 0;
|
|
|
|
if (hw->enabled)
|
|
err = regmap_update_bits(hw->regmap, HTS221_REG_CNTRL1_ADDR,
|
|
HTS221_ENABLE_MASK,
|
|
FIELD_PREP(HTS221_ENABLE_MASK,
|
|
true));
|
|
return err;
|
|
}
|
|
|
|
EXPORT_NS_SIMPLE_DEV_PM_OPS(hts221_pm_ops, hts221_suspend, hts221_resume,
|
|
IIO_HTS221);
|
|
|
|
MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
|
|
MODULE_DESCRIPTION("STMicroelectronics hts221 sensor driver");
|
|
MODULE_LICENSE("GPL v2");
|