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