drivers/iio/pressure/ms5637.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ms5637.c - Support for Measurement-Specialties MS5637, MS5805
   4  *            MS5837 and MS8607 pressure & temperature sensor
   5  *
   6  * Copyright (c) 2015 Measurement-Specialties
   7  *
   8  * (7-bit I2C slave address 0x76)
   9  *
  10  * Datasheet:
  11  *  http://www.meas-spec.com/downloads/MS5637-02BA03.pdf
  12  * Datasheet:
  13  *  http://www.meas-spec.com/downloads/MS5805-02BA01.pdf
  14  * Datasheet:
  15  *  http://www.meas-spec.com/downloads/MS5837-30BA.pdf
  16  * Datasheet:
  17  *  http://www.meas-spec.com/downloads/MS8607-02BA01.pdf
  18  */
  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
  33 struct ms_tp_data {
  34         const char *name;
  35         const struct ms_tp_hw_data *hw;
  36 };
  37
  38 static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 };
  39
  40 static 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
  53 static 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
  92 static 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
 115 static 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
 128 static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq);
 129
 130 static struct attribute *ms5637_attributes[] = {
 131         &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 132         NULL,
 133 };
 134
 135 static const struct attribute_group ms5637_attribute_group = {
 136         .attrs = ms5637_attributes,
 137 };
 138
 139 static 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
 145 static 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
 194 static const struct ms_tp_hw_data ms5637_hw_data  = {
 195         .prom_len = 7,
 196         .max_res_index = 5
 197 };
 198
 199 static const struct ms_tp_hw_data ms5803_hw_data  = {
 200         .prom_len = 8,
 201         .max_res_index = 4
 202 };
 203
 204 static const struct ms_tp_data ms5637_data = { .name = "ms5637", .hw = &ms5637_hw_data };
 205
 206 static const struct ms_tp_data ms5803_data = { .name = "ms5803", .hw = &ms5803_hw_data };
 207
 208 static const struct ms_tp_data ms5805_data = { .name = "ms5805", .hw = &ms5637_hw_data };
 209
 210 static const struct ms_tp_data ms5837_data = { .name = "ms5837", .hw = &ms5637_hw_data };
 211
 212 static const struct ms_tp_data ms8607_data = {
 213         .name = "ms8607-temppressure",
 214         .hw = &ms5637_hw_data,
 215 };
 216
 217 static 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 };
 224 MODULE_DEVICE_TABLE(i2c, ms5637_id);
 225
 226 static 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 };
 234 MODULE_DEVICE_TABLE(of, ms5637_of_match);
 235
 236 static 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
 245 module_i2c_driver(ms5637_driver);
 246
 247 MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver");
 248 MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
 249 MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
 250 MODULE_LICENSE("GPL v2");
 251 MODULE_IMPORT_NS("IIO_MEAS_SPEC_SENSORS");