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254 lines
6.4 KiB
254 lines
6.4 KiB
// 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 <[email protected]>"); |
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MODULE_AUTHOR("Ludovic Tancerel <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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