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 i2c_device_id *id = i2c_client_get_device_id(client); 148 const struct ms_tp_data *data; 149 struct ms_tp_dev *dev_data; 150 struct iio_dev *indio_dev; 151 int ret; 152 153 if (!i2c_check_functionality(client->adapter, 154 I2C_FUNC_SMBUS_READ_WORD_DATA | 155 I2C_FUNC_SMBUS_WRITE_BYTE | 156 I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { 157 dev_err(&client->dev, 158 "Adapter does not support some i2c transaction\n"); 159 return -EOPNOTSUPP; 160 } 161 162 if (id) 163 data = (const struct ms_tp_data *)id->driver_data; 164 else 165 data = device_get_match_data(&client->dev); 166 if (!data) 167 return -EINVAL; 168 169 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data)); 170 if (!indio_dev) 171 return -ENOMEM; 172 173 dev_data = iio_priv(indio_dev); 174 dev_data->client = client; 175 dev_data->res_index = data->hw->max_res_index; 176 dev_data->hw = data->hw; 177 mutex_init(&dev_data->lock); 178 179 indio_dev->info = &ms5637_info; 180 indio_dev->name = data->name; 181 indio_dev->modes = INDIO_DIRECT_MODE; 182 indio_dev->channels = ms5637_channels; 183 indio_dev->num_channels = ARRAY_SIZE(ms5637_channels); 184 185 i2c_set_clientdata(client, indio_dev); 186 187 ret = ms_sensors_reset(client, 0x1E, 3000); 188 if (ret) 189 return ret; 190 191 ret = ms_sensors_tp_read_prom(dev_data); 192 if (ret) 193 return ret; 194 195 return devm_iio_device_register(&client->dev, indio_dev); 196 } 197 198 static const struct ms_tp_hw_data ms5637_hw_data = { 199 .prom_len = 7, 200 .max_res_index = 5 201 }; 202 203 static const struct ms_tp_hw_data ms5803_hw_data = { 204 .prom_len = 8, 205 .max_res_index = 4 206 }; 207 208 static const struct ms_tp_data ms5637_data = { .name = "ms5637", .hw = &ms5637_hw_data }; 209 210 static const struct ms_tp_data ms5803_data = { .name = "ms5803", .hw = &ms5803_hw_data }; 211 212 static const struct ms_tp_data ms5805_data = { .name = "ms5805", .hw = &ms5637_hw_data }; 213 214 static const struct ms_tp_data ms5837_data = { .name = "ms5837", .hw = &ms5637_hw_data }; 215 216 static const struct ms_tp_data ms8607_data = { 217 .name = "ms8607-temppressure", 218 .hw = &ms5637_hw_data, 219 }; 220 221 static const struct i2c_device_id ms5637_id[] = { 222 {"ms5637", (kernel_ulong_t)&ms5637_data }, 223 {"ms5805", (kernel_ulong_t)&ms5805_data }, 224 {"ms5837", (kernel_ulong_t)&ms5837_data }, 225 {"ms8607-temppressure", (kernel_ulong_t)&ms8607_data }, 226 {} 227 }; 228 MODULE_DEVICE_TABLE(i2c, ms5637_id); 229 230 static const struct of_device_id ms5637_of_match[] = { 231 { .compatible = "meas,ms5637", .data = &ms5637_data }, 232 { .compatible = "meas,ms5803", .data = &ms5803_data }, 233 { .compatible = "meas,ms5805", .data = &ms5805_data }, 234 { .compatible = "meas,ms5837", .data = &ms5837_data }, 235 { .compatible = "meas,ms8607-temppressure", .data = &ms8607_data }, 236 { }, 237 }; 238 MODULE_DEVICE_TABLE(of, ms5637_of_match); 239 240 static struct i2c_driver ms5637_driver = { 241 .probe_new = ms5637_probe, 242 .id_table = ms5637_id, 243 .driver = { 244 .name = "ms5637", 245 .of_match_table = ms5637_of_match, 246 }, 247 }; 248 249 module_i2c_driver(ms5637_driver); 250 251 MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver"); 252 MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>"); 253 MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>"); 254 MODULE_LICENSE("GPL v2"); 255 MODULE_IMPORT_NS(IIO_MEAS_SPEC_SENSORS); 256