1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * ms5637.c - Support for Measurement-Specialties MS5637, MS5805
4 *            MS5837 and MS8607 pressure & temperature sensor
5 *
6 * Copyright (c) 2015 Measurement-Specialties
7 *
8 * (7-bit I2C slave address 0x76)
9 *
10 * Datasheet:
11 *  http://www.meas-spec.com/downloads/MS5637-02BA03.pdf
12 * Datasheet:
13 *  http://www.meas-spec.com/downloads/MS5805-02BA01.pdf
14 * Datasheet:
15 *  http://www.meas-spec.com/downloads/MS5837-30BA.pdf
16 * Datasheet:
17 *  http://www.meas-spec.com/downloads/MS8607-02BA01.pdf
18 */
19
20#include <linux/init.h>
21#include <linux/device.h>
22#include <linux/kernel.h>
23#include <linux/stat.h>
24#include <linux/module.h>
25#include <linux/mod_devicetable.h>
26#include <linux/i2c.h>
27#include <linux/iio/iio.h>
28#include <linux/iio/sysfs.h>
29#include <linux/mutex.h>
30
31#include "../common/ms_sensors/ms_sensors_i2c.h"
32
33static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 };
34/* String copy of the above const for readability purpose */
35static const char ms5637_show_samp_freq[] = "960 480 240 120 60 30";
36
37static int ms5637_read_raw(struct iio_dev *indio_dev,
38			   struct iio_chan_spec const *channel, int *val,
39			   int *val2, long mask)
40{
41	int ret;
42	int temperature;
43	unsigned int pressure;
44	struct ms_tp_dev *dev_data = iio_priv(indio_dev);
45
46	switch (mask) {
47	case IIO_CHAN_INFO_PROCESSED:
48		ret = ms_sensors_read_temp_and_pressure(dev_data,
49							&temperature,
50							&pressure);
51		if (ret)
52			return ret;
53
54		switch (channel->type) {
55		case IIO_TEMP:	/* in milli °C */
56			*val = temperature;
57
58			return IIO_VAL_INT;
59		case IIO_PRESSURE:	/* in kPa */
60			*val = pressure / 1000;
61			*val2 = (pressure % 1000) * 1000;
62
63			return IIO_VAL_INT_PLUS_MICRO;
64		default:
65			return -EINVAL;
66		}
67	case IIO_CHAN_INFO_SAMP_FREQ:
68		*val = ms5637_samp_freq[dev_data->res_index];
69
70		return IIO_VAL_INT;
71	default:
72		return -EINVAL;
73	}
74}
75
76static int ms5637_write_raw(struct iio_dev *indio_dev,
77			    struct iio_chan_spec const *chan,
78			    int val, int val2, long mask)
79{
80	struct ms_tp_dev *dev_data = iio_priv(indio_dev);
81	int i;
82
83	switch (mask) {
84	case IIO_CHAN_INFO_SAMP_FREQ:
85		i = ARRAY_SIZE(ms5637_samp_freq);
86		while (i-- > 0)
87			if (val == ms5637_samp_freq[i])
88				break;
89		if (i < 0)
90			return -EINVAL;
91		dev_data->res_index = i;
92
93		return 0;
94	default:
95		return -EINVAL;
96	}
97}
98
99static const struct iio_chan_spec ms5637_channels[] = {
100	{
101		.type = IIO_TEMP,
102		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
103		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
104	},
105	{
106		.type = IIO_PRESSURE,
107		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
108		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
109	}
110};
111
112static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq);
113
114static struct attribute *ms5637_attributes[] = {
115	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
116	NULL,
117};
118
119static const struct attribute_group ms5637_attribute_group = {
120	.attrs = ms5637_attributes,
121};
122
123static const struct iio_info ms5637_info = {
124	.read_raw = ms5637_read_raw,
125	.write_raw = ms5637_write_raw,
126	.attrs = &ms5637_attribute_group,
127};
128
129static int ms5637_probe(struct i2c_client *client,
130			const struct i2c_device_id *id)
131{
132	struct ms_tp_dev *dev_data;
133	struct iio_dev *indio_dev;
134	int ret;
135
136	if (!i2c_check_functionality(client->adapter,
137				     I2C_FUNC_SMBUS_READ_WORD_DATA |
138				     I2C_FUNC_SMBUS_WRITE_BYTE |
139				     I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
140		dev_err(&client->dev,
141			"Adapter does not support some i2c transaction\n");
142		return -EOPNOTSUPP;
143	}
144
145	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));
146	if (!indio_dev)
147		return -ENOMEM;
148
149	dev_data = iio_priv(indio_dev);
150	dev_data->client = client;
151	dev_data->res_index = 5;
152	mutex_init(&dev_data->lock);
153
154	indio_dev->info = &ms5637_info;
155	indio_dev->name = id->name;
156	indio_dev->modes = INDIO_DIRECT_MODE;
157	indio_dev->channels = ms5637_channels;
158	indio_dev->num_channels = ARRAY_SIZE(ms5637_channels);
159
160	i2c_set_clientdata(client, indio_dev);
161
162	ret = ms_sensors_reset(client, 0x1E, 3000);
163	if (ret)
164		return ret;
165
166	ret = ms_sensors_tp_read_prom(dev_data);
167	if (ret)
168		return ret;
169
170	return devm_iio_device_register(&client->dev, indio_dev);
171}
172
173static const struct i2c_device_id ms5637_id[] = {
174	{"ms5637", 0},
175	{"ms5805", 0},
176	{"ms5837", 0},
177	{"ms8607-temppressure", 0},
178	{}
179};
180MODULE_DEVICE_TABLE(i2c, ms5637_id);
181
182static const struct of_device_id ms5637_of_match[] = {
183	{ .compatible = "meas,ms5637", },
184	{ .compatible = "meas,ms5805", },
185	{ .compatible = "meas,ms5837", },
186	{ .compatible = "meas,ms8607-temppressure", },
187	{ },
188};
189MODULE_DEVICE_TABLE(of, ms5637_of_match);
190
191static struct i2c_driver ms5637_driver = {
192	.probe = ms5637_probe,
193	.id_table = ms5637_id,
194	.driver = {
195		   .name = "ms5637",
196		   .of_match_table = ms5637_of_match,
197		   },
198};
199
200module_i2c_driver(ms5637_driver);
201
202MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver");
203MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
204MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
205MODULE_LICENSE("GPL v2");
206