| // 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 <linux/init.h> |
| #include <linux/device.h> |
| #include <linux/kernel.h> |
| #include <linux/stat.h> |
| #include <linux/module.h> |
| #include <linux/mod_devicetable.h> |
| #include <linux/i2c.h> |
| #include <linux/iio/iio.h> |
| #include <linux/iio/sysfs.h> |
| #include <linux/mutex.h> |
| |
| #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 i2c_device_id *id = i2c_client_get_device_id(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; |
| } |
| |
| if (id) |
| data = (const struct ms_tp_data *)id->driver_data; |
| else |
| data = device_get_match_data(&client->dev); |
| 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_new = 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 <william.markezana@meas-spec.com>"); |
| MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_IMPORT_NS(IIO_MEAS_SPEC_SENSORS); |