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/i2c.h> 26 #include <linux/iio/iio.h> 27 #include <linux/iio/sysfs.h> 28 #include <linux/mutex.h> 29 30 #include "../common/ms_sensors/ms_sensors_i2c.h" 31 32 static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 }; 33 /* String copy of the above const for readability purpose */ 34 static const char ms5637_show_samp_freq[] = "960 480 240 120 60 30"; 35 36 static int ms5637_read_raw(struct iio_dev *indio_dev, 37 struct iio_chan_spec const *channel, int *val, 38 int *val2, long mask) 39 { 40 int ret; 41 int temperature; 42 unsigned int pressure; 43 struct ms_tp_dev *dev_data = iio_priv(indio_dev); 44 45 switch (mask) { 46 case IIO_CHAN_INFO_PROCESSED: 47 ret = ms_sensors_read_temp_and_pressure(dev_data, 48 &temperature, 49 &pressure); 50 if (ret) 51 return ret; 52 53 switch (channel->type) { 54 case IIO_TEMP: /* in milli °C */ 55 *val = temperature; 56 57 return IIO_VAL_INT; 58 case IIO_PRESSURE: /* in kPa */ 59 *val = pressure / 1000; 60 *val2 = (pressure % 1000) * 1000; 61 62 return IIO_VAL_INT_PLUS_MICRO; 63 default: 64 return -EINVAL; 65 } 66 case IIO_CHAN_INFO_SAMP_FREQ: 67 *val = ms5637_samp_freq[dev_data->res_index]; 68 69 return IIO_VAL_INT; 70 default: 71 return -EINVAL; 72 } 73 } 74 75 static int ms5637_write_raw(struct iio_dev *indio_dev, 76 struct iio_chan_spec const *chan, 77 int val, int val2, long mask) 78 { 79 struct ms_tp_dev *dev_data = iio_priv(indio_dev); 80 int i; 81 82 switch (mask) { 83 case IIO_CHAN_INFO_SAMP_FREQ: 84 i = ARRAY_SIZE(ms5637_samp_freq); 85 while (i-- > 0) 86 if (val == ms5637_samp_freq[i]) 87 break; 88 if (i < 0) 89 return -EINVAL; 90 dev_data->res_index = i; 91 92 return 0; 93 default: 94 return -EINVAL; 95 } 96 } 97 98 static const struct iio_chan_spec ms5637_channels[] = { 99 { 100 .type = IIO_TEMP, 101 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), 102 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 103 }, 104 { 105 .type = IIO_PRESSURE, 106 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), 107 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 108 } 109 }; 110 111 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq); 112 113 static struct attribute *ms5637_attributes[] = { 114 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 115 NULL, 116 }; 117 118 static const struct attribute_group ms5637_attribute_group = { 119 .attrs = ms5637_attributes, 120 }; 121 122 static const struct iio_info ms5637_info = { 123 .read_raw = ms5637_read_raw, 124 .write_raw = ms5637_write_raw, 125 .attrs = &ms5637_attribute_group, 126 }; 127 128 static int ms5637_probe(struct i2c_client *client, 129 const struct i2c_device_id *id) 130 { 131 struct ms_tp_dev *dev_data; 132 struct iio_dev *indio_dev; 133 int ret; 134 135 if (!i2c_check_functionality(client->adapter, 136 I2C_FUNC_SMBUS_READ_WORD_DATA | 137 I2C_FUNC_SMBUS_WRITE_BYTE | 138 I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { 139 dev_err(&client->dev, 140 "Adapter does not support some i2c transaction\n"); 141 return -EOPNOTSUPP; 142 } 143 144 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data)); 145 if (!indio_dev) 146 return -ENOMEM; 147 148 dev_data = iio_priv(indio_dev); 149 dev_data->client = client; 150 dev_data->res_index = 5; 151 mutex_init(&dev_data->lock); 152 153 indio_dev->info = &ms5637_info; 154 indio_dev->name = id->name; 155 indio_dev->modes = INDIO_DIRECT_MODE; 156 indio_dev->channels = ms5637_channels; 157 indio_dev->num_channels = ARRAY_SIZE(ms5637_channels); 158 159 i2c_set_clientdata(client, indio_dev); 160 161 ret = ms_sensors_reset(client, 0x1E, 3000); 162 if (ret) 163 return ret; 164 165 ret = ms_sensors_tp_read_prom(dev_data); 166 if (ret) 167 return ret; 168 169 return devm_iio_device_register(&client->dev, indio_dev); 170 } 171 172 static const struct i2c_device_id ms5637_id[] = { 173 {"ms5637", 0}, 174 {"ms5805", 0}, 175 {"ms5837", 0}, 176 {"ms8607-temppressure", 0}, 177 {} 178 }; 179 MODULE_DEVICE_TABLE(i2c, ms5637_id); 180 181 static const struct of_device_id ms5637_of_match[] = { 182 { .compatible = "meas,ms5637", }, 183 { .compatible = "meas,ms5805", }, 184 { .compatible = "meas,ms5837", }, 185 { .compatible = "meas,ms8607-temppressure", }, 186 { }, 187 }; 188 MODULE_DEVICE_TABLE(of, ms5637_of_match); 189 190 static struct i2c_driver ms5637_driver = { 191 .probe = ms5637_probe, 192 .id_table = ms5637_id, 193 .driver = { 194 .name = "ms5637", 195 .of_match_table = of_match_ptr(ms5637_of_match), 196 }, 197 }; 198 199 module_i2c_driver(ms5637_driver); 200 201 MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver"); 202 MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>"); 203 MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>"); 204 MODULE_LICENSE("GPL v2"); 205