123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255 |
- // 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)
- {
- 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 = 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 <[email protected]>");
- MODULE_AUTHOR("Ludovic Tancerel <[email protected]>");
- MODULE_LICENSE("GPL v2");
- MODULE_IMPORT_NS(IIO_MEAS_SPEC_SENSORS);
|