// SPDX-License-Identifier: GPL-2.0-only /* * ms5637.c - Support for Measurement-Specialties MS5637, MS5805 * MS5837 and MS8607 pressure & temperature sensor * * Copyright (c) 2015 Measurement-Specialties * * (7-bit I2C slave address 0x76) * * Datasheet: * http://www.meas-spec.com/downloads/MS5637-02BA03.pdf * Datasheet: * http://www.meas-spec.com/downloads/MS5805-02BA01.pdf * Datasheet: * http://www.meas-spec.com/downloads/MS5837-30BA.pdf * Datasheet: * http://www.meas-spec.com/downloads/MS8607-02BA01.pdf */ #include #include #include #include #include #include #include #include #include #include #include "../common/ms_sensors/ms_sensors_i2c.h" struct ms_tp_data { const char *name; const struct ms_tp_hw_data *hw; }; static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 }; static ssize_t ms5637_show_samp_freq(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct ms_tp_dev *dev_data = iio_priv(indio_dev); int i, len = 0; for (i = 0; i <= dev_data->hw->max_res_index; i++) len += sysfs_emit_at(buf, len, "%u ", ms5637_samp_freq[i]); sysfs_emit_at(buf, len - 1, "\n"); return len; } static int ms5637_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *channel, int *val, int *val2, long mask) { int ret; int temperature; unsigned int pressure; struct ms_tp_dev *dev_data = iio_priv(indio_dev); switch (mask) { case IIO_CHAN_INFO_PROCESSED: ret = ms_sensors_read_temp_and_pressure(dev_data, &temperature, &pressure); if (ret) return ret; switch (channel->type) { case IIO_TEMP: /* in milli °C */ *val = temperature; return IIO_VAL_INT; case IIO_PRESSURE: /* in kPa */ *val = pressure / 1000; *val2 = (pressure % 1000) * 1000; return IIO_VAL_INT_PLUS_MICRO; default: return -EINVAL; } case IIO_CHAN_INFO_SAMP_FREQ: *val = ms5637_samp_freq[dev_data->res_index]; return IIO_VAL_INT; default: return -EINVAL; } } static int ms5637_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct ms_tp_dev *dev_data = iio_priv(indio_dev); int i; switch (mask) { case IIO_CHAN_INFO_SAMP_FREQ: i = ARRAY_SIZE(ms5637_samp_freq); while (i-- > 0) if (val == ms5637_samp_freq[i]) break; if (i < 0) return -EINVAL; dev_data->res_index = i; return 0; default: return -EINVAL; } } static const struct iio_chan_spec ms5637_channels[] = { { .type = IIO_TEMP, .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), }, { .type = IIO_PRESSURE, .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), } }; static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq); static struct attribute *ms5637_attributes[] = { &iio_dev_attr_sampling_frequency_available.dev_attr.attr, NULL, }; static const struct attribute_group ms5637_attribute_group = { .attrs = ms5637_attributes, }; static const struct iio_info ms5637_info = { .read_raw = ms5637_read_raw, .write_raw = ms5637_write_raw, .attrs = &ms5637_attribute_group, }; static int ms5637_probe(struct i2c_client *client) { const struct ms_tp_data *data; struct ms_tp_dev *dev_data; struct iio_dev *indio_dev; int ret; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_WORD_DATA | I2C_FUNC_SMBUS_WRITE_BYTE | I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { dev_err(&client->dev, "Adapter does not support some i2c transaction\n"); return -EOPNOTSUPP; } data = i2c_get_match_data(client); if (!data) return -EINVAL; indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data)); if (!indio_dev) return -ENOMEM; dev_data = iio_priv(indio_dev); dev_data->client = client; dev_data->res_index = data->hw->max_res_index; dev_data->hw = data->hw; mutex_init(&dev_data->lock); indio_dev->info = &ms5637_info; indio_dev->name = data->name; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->channels = ms5637_channels; indio_dev->num_channels = ARRAY_SIZE(ms5637_channels); i2c_set_clientdata(client, indio_dev); ret = ms_sensors_reset(client, 0x1E, 3000); if (ret) return ret; ret = ms_sensors_tp_read_prom(dev_data); if (ret) return ret; return devm_iio_device_register(&client->dev, indio_dev); } static const struct ms_tp_hw_data ms5637_hw_data = { .prom_len = 7, .max_res_index = 5 }; static const struct ms_tp_hw_data ms5803_hw_data = { .prom_len = 8, .max_res_index = 4 }; static const struct ms_tp_data ms5637_data = { .name = "ms5637", .hw = &ms5637_hw_data }; static const struct ms_tp_data ms5803_data = { .name = "ms5803", .hw = &ms5803_hw_data }; static const struct ms_tp_data ms5805_data = { .name = "ms5805", .hw = &ms5637_hw_data }; static const struct ms_tp_data ms5837_data = { .name = "ms5837", .hw = &ms5637_hw_data }; static const struct ms_tp_data ms8607_data = { .name = "ms8607-temppressure", .hw = &ms5637_hw_data, }; static const struct i2c_device_id ms5637_id[] = { {"ms5637", (kernel_ulong_t)&ms5637_data }, {"ms5805", (kernel_ulong_t)&ms5805_data }, {"ms5837", (kernel_ulong_t)&ms5837_data }, {"ms8607-temppressure", (kernel_ulong_t)&ms8607_data }, {} }; MODULE_DEVICE_TABLE(i2c, ms5637_id); static const struct of_device_id ms5637_of_match[] = { { .compatible = "meas,ms5637", .data = &ms5637_data }, { .compatible = "meas,ms5803", .data = &ms5803_data }, { .compatible = "meas,ms5805", .data = &ms5805_data }, { .compatible = "meas,ms5837", .data = &ms5837_data }, { .compatible = "meas,ms8607-temppressure", .data = &ms8607_data }, { }, }; MODULE_DEVICE_TABLE(of, ms5637_of_match); static struct i2c_driver ms5637_driver = { .probe = ms5637_probe, .id_table = ms5637_id, .driver = { .name = "ms5637", .of_match_table = ms5637_of_match, }, }; module_i2c_driver(ms5637_driver); MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver"); MODULE_AUTHOR("William Markezana "); MODULE_AUTHOR("Ludovic Tancerel "); MODULE_LICENSE("GPL v2"); MODULE_IMPORT_NS("IIO_MEAS_SPEC_SENSORS");