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// 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_REG_AVG_ADDR 0x10
#define HTS221_REG_H_OUT_L 0x28
#define HTS221_REG_T_OUT_L 0x2a
#define HTS221_HUMIDITY_AVG_MASK 0x07
#define HTS221_TEMP_AVG_MASK 0x38
#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 = HTS221_REG_AVG_ADDR,
.mask = HTS221_HUMIDITY_AVG_MASK,
.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 = HTS221_REG_AVG_ADDR,
.mask = HTS221_TEMP_AVG_MASK,
.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 = HTS221_REG_H_OUT_L,
.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 = HTS221_REG_T_OUT_L,
.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
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