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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * ms5637.c - Support for Measurement-Specialties MS5637, MS58054 * MS5837 and MS8607 pressure & temperature sensor5 *6 * Copyright (c) 2015 Measurement-Specialties7 *8 * (7-bit I2C slave address 0x76)9 *10 * Datasheet:11 * http://www.meas-spec.com/downloads/MS5637-02BA03.pdf12 * Datasheet:13 * http://www.meas-spec.com/downloads/MS5805-02BA01.pdf14 * Datasheet:15 * http://www.meas-spec.com/downloads/MS5837-30BA.pdf16 * Datasheet:17 * http://www.meas-spec.com/downloads/MS8607-02BA01.pdf18 */19 20#include <linux/init.h>21#include <linux/device.h>22#include <linux/kernel.h>23#include <linux/stat.h>24#include <linux/module.h>25#include <linux/mod_devicetable.h>26#include <linux/i2c.h>27#include <linux/iio/iio.h>28#include <linux/iio/sysfs.h>29#include <linux/mutex.h>30 31#include "../common/ms_sensors/ms_sensors_i2c.h"32 33struct ms_tp_data {34 const char *name;35 const struct ms_tp_hw_data *hw;36};37 38static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 };39 40static ssize_t ms5637_show_samp_freq(struct device *dev, struct device_attribute *attr, char *buf)41{42 struct iio_dev *indio_dev = dev_to_iio_dev(dev);43 struct ms_tp_dev *dev_data = iio_priv(indio_dev);44 int i, len = 0;45 46 for (i = 0; i <= dev_data->hw->max_res_index; i++)47 len += sysfs_emit_at(buf, len, "%u ", ms5637_samp_freq[i]);48 sysfs_emit_at(buf, len - 1, "\n");49 50 return len;51}52 53static int ms5637_read_raw(struct iio_dev *indio_dev,54 struct iio_chan_spec const *channel, int *val,55 int *val2, long mask)56{57 int ret;58 int temperature;59 unsigned int pressure;60 struct ms_tp_dev *dev_data = iio_priv(indio_dev);61 62 switch (mask) {63 case IIO_CHAN_INFO_PROCESSED:64 ret = ms_sensors_read_temp_and_pressure(dev_data,65 &temperature,66 &pressure);67 if (ret)68 return ret;69 70 switch (channel->type) {71 case IIO_TEMP: /* in milli °C */72 *val = temperature;73 74 return IIO_VAL_INT;75 case IIO_PRESSURE: /* in kPa */76 *val = pressure / 1000;77 *val2 = (pressure % 1000) * 1000;78 79 return IIO_VAL_INT_PLUS_MICRO;80 default:81 return -EINVAL;82 }83 case IIO_CHAN_INFO_SAMP_FREQ:84 *val = ms5637_samp_freq[dev_data->res_index];85 86 return IIO_VAL_INT;87 default:88 return -EINVAL;89 }90}91 92static int ms5637_write_raw(struct iio_dev *indio_dev,93 struct iio_chan_spec const *chan,94 int val, int val2, long mask)95{96 struct ms_tp_dev *dev_data = iio_priv(indio_dev);97 int i;98 99 switch (mask) {100 case IIO_CHAN_INFO_SAMP_FREQ:101 i = ARRAY_SIZE(ms5637_samp_freq);102 while (i-- > 0)103 if (val == ms5637_samp_freq[i])104 break;105 if (i < 0)106 return -EINVAL;107 dev_data->res_index = i;108 109 return 0;110 default:111 return -EINVAL;112 }113}114 115static const struct iio_chan_spec ms5637_channels[] = {116 {117 .type = IIO_TEMP,118 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),119 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),120 },121 {122 .type = IIO_PRESSURE,123 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),124 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),125 }126};127 128static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq);129 130static struct attribute *ms5637_attributes[] = {131 &iio_dev_attr_sampling_frequency_available.dev_attr.attr,132 NULL,133};134 135static const struct attribute_group ms5637_attribute_group = {136 .attrs = ms5637_attributes,137};138 139static const struct iio_info ms5637_info = {140 .read_raw = ms5637_read_raw,141 .write_raw = ms5637_write_raw,142 .attrs = &ms5637_attribute_group,143};144 145static int ms5637_probe(struct i2c_client *client)146{147 const struct ms_tp_data *data;148 struct ms_tp_dev *dev_data;149 struct iio_dev *indio_dev;150 int ret;151 152 if (!i2c_check_functionality(client->adapter,153 I2C_FUNC_SMBUS_READ_WORD_DATA |154 I2C_FUNC_SMBUS_WRITE_BYTE |155 I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {156 dev_err(&client->dev,157 "Adapter does not support some i2c transaction\n");158 return -EOPNOTSUPP;159 }160 161 data = i2c_get_match_data(client);162 if (!data)163 return -EINVAL;164 165 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));166 if (!indio_dev)167 return -ENOMEM;168 169 dev_data = iio_priv(indio_dev);170 dev_data->client = client;171 dev_data->res_index = data->hw->max_res_index;172 dev_data->hw = data->hw;173 mutex_init(&dev_data->lock);174 175 indio_dev->info = &ms5637_info;176 indio_dev->name = data->name;177 indio_dev->modes = INDIO_DIRECT_MODE;178 indio_dev->channels = ms5637_channels;179 indio_dev->num_channels = ARRAY_SIZE(ms5637_channels);180 181 i2c_set_clientdata(client, indio_dev);182 183 ret = ms_sensors_reset(client, 0x1E, 3000);184 if (ret)185 return ret;186 187 ret = ms_sensors_tp_read_prom(dev_data);188 if (ret)189 return ret;190 191 return devm_iio_device_register(&client->dev, indio_dev);192}193 194static const struct ms_tp_hw_data ms5637_hw_data = {195 .prom_len = 7,196 .max_res_index = 5197};198 199static const struct ms_tp_hw_data ms5803_hw_data = {200 .prom_len = 8,201 .max_res_index = 4202};203 204static const struct ms_tp_data ms5637_data = { .name = "ms5637", .hw = &ms5637_hw_data };205 206static const struct ms_tp_data ms5803_data = { .name = "ms5803", .hw = &ms5803_hw_data };207 208static const struct ms_tp_data ms5805_data = { .name = "ms5805", .hw = &ms5637_hw_data };209 210static const struct ms_tp_data ms5837_data = { .name = "ms5837", .hw = &ms5637_hw_data };211 212static const struct ms_tp_data ms8607_data = {213 .name = "ms8607-temppressure",214 .hw = &ms5637_hw_data,215};216 217static const struct i2c_device_id ms5637_id[] = {218 {"ms5637", (kernel_ulong_t)&ms5637_data },219 {"ms5805", (kernel_ulong_t)&ms5805_data },220 {"ms5837", (kernel_ulong_t)&ms5837_data },221 {"ms8607-temppressure", (kernel_ulong_t)&ms8607_data },222 {}223};224MODULE_DEVICE_TABLE(i2c, ms5637_id);225 226static const struct of_device_id ms5637_of_match[] = {227 { .compatible = "meas,ms5637", .data = &ms5637_data },228 { .compatible = "meas,ms5803", .data = &ms5803_data },229 { .compatible = "meas,ms5805", .data = &ms5805_data },230 { .compatible = "meas,ms5837", .data = &ms5837_data },231 { .compatible = "meas,ms8607-temppressure", .data = &ms8607_data },232 { },233};234MODULE_DEVICE_TABLE(of, ms5637_of_match);235 236static struct i2c_driver ms5637_driver = {237 .probe = ms5637_probe,238 .id_table = ms5637_id,239 .driver = {240 .name = "ms5637",241 .of_match_table = ms5637_of_match,242 },243};244 245module_i2c_driver(ms5637_driver);246 247MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver");248MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");249MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");250MODULE_LICENSE("GPL v2");251MODULE_IMPORT_NS(IIO_MEAS_SPEC_SENSORS);252