1 /* 2 * ms5637.c - Support for Measurement-Specialties MS5637, MS5805 3 * MS5837 and MS8607 pressure & temperature sensor 4 * 5 * Copyright (c) 2015 Measurement-Specialties 6 * 7 * Licensed under the GPL-2. 8 * 9 * (7-bit I2C slave address 0x76) 10 * 11 * Datasheet: 12 * http://www.meas-spec.com/downloads/MS5637-02BA03.pdf 13 * Datasheet: 14 * http://www.meas-spec.com/downloads/MS5805-02BA01.pdf 15 * Datasheet: 16 * http://www.meas-spec.com/downloads/MS5837-30BA.pdf 17 * Datasheet: 18 * http://www.meas-spec.com/downloads/MS8607-02BA01.pdf 19 */ 20 21 #include <linux/init.h> 22 #include <linux/device.h> 23 #include <linux/kernel.h> 24 #include <linux/stat.h> 25 #include <linux/module.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 static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 }; 34 /* String copy of the above const for readability purpose */ 35 static const char ms5637_show_samp_freq[] = "960 480 240 120 60 30"; 36 37 static int ms5637_read_raw(struct iio_dev *indio_dev, 38 struct iio_chan_spec const *channel, int *val, 39 int *val2, long mask) 40 { 41 int ret; 42 int temperature; 43 unsigned int pressure; 44 struct ms_tp_dev *dev_data = iio_priv(indio_dev); 45 46 switch (mask) { 47 case IIO_CHAN_INFO_PROCESSED: 48 ret = ms_sensors_read_temp_and_pressure(dev_data, 49 &temperature, 50 &pressure); 51 if (ret) 52 return ret; 53 54 switch (channel->type) { 55 case IIO_TEMP: /* in milli °C */ 56 *val = temperature; 57 58 return IIO_VAL_INT; 59 case IIO_PRESSURE: /* in kPa */ 60 *val = pressure / 1000; 61 *val2 = (pressure % 1000) * 1000; 62 63 return IIO_VAL_INT_PLUS_MICRO; 64 default: 65 return -EINVAL; 66 } 67 case IIO_CHAN_INFO_SAMP_FREQ: 68 *val = ms5637_samp_freq[dev_data->res_index]; 69 70 return IIO_VAL_INT; 71 default: 72 return -EINVAL; 73 } 74 } 75 76 static int ms5637_write_raw(struct iio_dev *indio_dev, 77 struct iio_chan_spec const *chan, 78 int val, int val2, long mask) 79 { 80 struct ms_tp_dev *dev_data = iio_priv(indio_dev); 81 int i; 82 83 switch (mask) { 84 case IIO_CHAN_INFO_SAMP_FREQ: 85 i = ARRAY_SIZE(ms5637_samp_freq); 86 while (i-- > 0) 87 if (val == ms5637_samp_freq[i]) 88 break; 89 if (i < 0) 90 return -EINVAL; 91 dev_data->res_index = i; 92 93 return 0; 94 default: 95 return -EINVAL; 96 } 97 } 98 99 static const struct iio_chan_spec ms5637_channels[] = { 100 { 101 .type = IIO_TEMP, 102 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), 103 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 104 }, 105 { 106 .type = IIO_PRESSURE, 107 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), 108 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 109 } 110 }; 111 112 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq); 113 114 static struct attribute *ms5637_attributes[] = { 115 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 116 NULL, 117 }; 118 119 static const struct attribute_group ms5637_attribute_group = { 120 .attrs = ms5637_attributes, 121 }; 122 123 static const struct iio_info ms5637_info = { 124 .read_raw = ms5637_read_raw, 125 .write_raw = ms5637_write_raw, 126 .attrs = &ms5637_attribute_group, 127 .driver_module = THIS_MODULE, 128 }; 129 130 static int ms5637_probe(struct i2c_client *client, 131 const struct i2c_device_id *id) 132 { 133 struct ms_tp_dev *dev_data; 134 struct iio_dev *indio_dev; 135 int ret; 136 137 if (!i2c_check_functionality(client->adapter, 138 I2C_FUNC_SMBUS_READ_WORD_DATA | 139 I2C_FUNC_SMBUS_WRITE_BYTE | 140 I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { 141 dev_err(&client->dev, 142 "Adapter does not support some i2c transaction\n"); 143 return -EOPNOTSUPP; 144 } 145 146 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data)); 147 if (!indio_dev) 148 return -ENOMEM; 149 150 dev_data = iio_priv(indio_dev); 151 dev_data->client = client; 152 dev_data->res_index = 5; 153 mutex_init(&dev_data->lock); 154 155 indio_dev->info = &ms5637_info; 156 indio_dev->name = id->name; 157 indio_dev->dev.parent = &client->dev; 158 indio_dev->modes = INDIO_DIRECT_MODE; 159 indio_dev->channels = ms5637_channels; 160 indio_dev->num_channels = ARRAY_SIZE(ms5637_channels); 161 162 i2c_set_clientdata(client, indio_dev); 163 164 ret = ms_sensors_reset(client, 0x1E, 3000); 165 if (ret) 166 return ret; 167 168 ret = ms_sensors_tp_read_prom(dev_data); 169 if (ret) 170 return ret; 171 172 return devm_iio_device_register(&client->dev, indio_dev); 173 } 174 175 static const struct i2c_device_id ms5637_id[] = { 176 {"ms5637", 0}, 177 {"ms5805", 0}, 178 {"ms5837", 0}, 179 {"ms8607-temppressure", 0}, 180 {} 181 }; 182 MODULE_DEVICE_TABLE(i2c, ms5637_id); 183 184 static struct i2c_driver ms5637_driver = { 185 .probe = ms5637_probe, 186 .id_table = ms5637_id, 187 .driver = { 188 .name = "ms5637" 189 }, 190 }; 191 192 module_i2c_driver(ms5637_driver); 193 194 MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver"); 195 MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>"); 196 MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>"); 197 MODULE_LICENSE("GPL v2"); 198