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
33struct ms_tp_data {
34	const char *name;
35	const struct ms_tp_hw_data *hw;
36};
37
38static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 };
39
40static ssize_t ms5637_show_samp_freq(struct device *dev, struct device_attribute *attr, char *buf)
41{
42	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
43	struct ms_tp_dev *dev_data = iio_priv(indio_dev);
44	int i, len = 0;
45
46	for (i = 0; i <= dev_data->hw->max_res_index; i++)
47		len += sysfs_emit_at(buf, len, "%u ", ms5637_samp_freq[i]);
48	sysfs_emit_at(buf, len - 1, "\n");
49
50	return len;
51}
52
53static int ms5637_read_raw(struct iio_dev *indio_dev,
54			   struct iio_chan_spec const *channel, int *val,
55			   int *val2, long mask)
56{
57	int ret;
58	int temperature;
59	unsigned int pressure;
60	struct ms_tp_dev *dev_data = iio_priv(indio_dev);
61
62	switch (mask) {
63	case IIO_CHAN_INFO_PROCESSED:
64		ret = ms_sensors_read_temp_and_pressure(dev_data,
65							&temperature,
66							&pressure);
67		if (ret)
68			return ret;
69
70		switch (channel->type) {
71		case IIO_TEMP:	/* in milli °C */
72			*val = temperature;
73
74			return IIO_VAL_INT;
75		case IIO_PRESSURE:	/* in kPa */
76			*val = pressure / 1000;
77			*val2 = (pressure % 1000) * 1000;
78
79			return IIO_VAL_INT_PLUS_MICRO;
80		default:
81			return -EINVAL;
82		}
83	case IIO_CHAN_INFO_SAMP_FREQ:
84		*val = ms5637_samp_freq[dev_data->res_index];
85
86		return IIO_VAL_INT;
87	default:
88		return -EINVAL;
89	}
90}
91
92static int ms5637_write_raw(struct iio_dev *indio_dev,
93			    struct iio_chan_spec const *chan,
94			    int val, int val2, long mask)
95{
96	struct ms_tp_dev *dev_data = iio_priv(indio_dev);
97	int i;
98
99	switch (mask) {
100	case IIO_CHAN_INFO_SAMP_FREQ:
101		i = ARRAY_SIZE(ms5637_samp_freq);
102		while (i-- > 0)
103			if (val == ms5637_samp_freq[i])
104				break;
105		if (i < 0)
106			return -EINVAL;
107		dev_data->res_index = i;
108
109		return 0;
110	default:
111		return -EINVAL;
112	}
113}
114
115static const struct iio_chan_spec ms5637_channels[] = {
116	{
117		.type = IIO_TEMP,
118		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
119		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
120	},
121	{
122		.type = IIO_PRESSURE,
123		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
124		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
125	}
126};
127
128static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq);
129
130static struct attribute *ms5637_attributes[] = {
131	&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
132	NULL,
133};
134
135static const struct attribute_group ms5637_attribute_group = {
136	.attrs = ms5637_attributes,
137};
138
139static const struct iio_info ms5637_info = {
140	.read_raw = ms5637_read_raw,
141	.write_raw = ms5637_write_raw,
142	.attrs = &ms5637_attribute_group,
143};
144
145static int ms5637_probe(struct i2c_client *client)
146{
147	const struct i2c_device_id *id = i2c_client_get_device_id(client);
148	const struct ms_tp_data *data;
149	struct ms_tp_dev *dev_data;
150	struct iio_dev *indio_dev;
151	int ret;
152
153	if (!i2c_check_functionality(client->adapter,
154				     I2C_FUNC_SMBUS_READ_WORD_DATA |
155				     I2C_FUNC_SMBUS_WRITE_BYTE |
156				     I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
157		dev_err(&client->dev,
158			"Adapter does not support some i2c transaction\n");
159		return -EOPNOTSUPP;
160	}
161
162	if (id)
163		data = (const struct ms_tp_data *)id->driver_data;
164	else
165		data = device_get_match_data(&client->dev);
166	if (!data)
167		return -EINVAL;
168
169	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));
170	if (!indio_dev)
171		return -ENOMEM;
172
173	dev_data = iio_priv(indio_dev);
174	dev_data->client = client;
175	dev_data->res_index = data->hw->max_res_index;
176	dev_data->hw = data->hw;
177	mutex_init(&dev_data->lock);
178
179	indio_dev->info = &ms5637_info;
180	indio_dev->name = data->name;
181	indio_dev->modes = INDIO_DIRECT_MODE;
182	indio_dev->channels = ms5637_channels;
183	indio_dev->num_channels = ARRAY_SIZE(ms5637_channels);
184
185	i2c_set_clientdata(client, indio_dev);
186
187	ret = ms_sensors_reset(client, 0x1E, 3000);
188	if (ret)
189		return ret;
190
191	ret = ms_sensors_tp_read_prom(dev_data);
192	if (ret)
193		return ret;
194
195	return devm_iio_device_register(&client->dev, indio_dev);
196}
197
198static const struct ms_tp_hw_data ms5637_hw_data  = {
199	.prom_len = 7,
200	.max_res_index = 5
201};
202
203static const struct ms_tp_hw_data ms5803_hw_data  = {
204	.prom_len = 8,
205	.max_res_index = 4
206};
207
208static const struct ms_tp_data ms5637_data = { .name = "ms5637", .hw = &ms5637_hw_data };
209
210static const struct ms_tp_data ms5803_data = { .name = "ms5803", .hw = &ms5803_hw_data };
211
212static const struct ms_tp_data ms5805_data = { .name = "ms5805", .hw = &ms5637_hw_data };
213
214static const struct ms_tp_data ms5837_data = { .name = "ms5837", .hw = &ms5637_hw_data };
215
216static const struct ms_tp_data ms8607_data = {
217	.name = "ms8607-temppressure",
218	.hw = &ms5637_hw_data,
219};
220
221static const struct i2c_device_id ms5637_id[] = {
222	{"ms5637", (kernel_ulong_t)&ms5637_data },
223	{"ms5805", (kernel_ulong_t)&ms5805_data },
224	{"ms5837", (kernel_ulong_t)&ms5837_data },
225	{"ms8607-temppressure", (kernel_ulong_t)&ms8607_data },
226	{}
227};
228MODULE_DEVICE_TABLE(i2c, ms5637_id);
229
230static const struct of_device_id ms5637_of_match[] = {
231	{ .compatible = "meas,ms5637", .data = &ms5637_data },
232	{ .compatible = "meas,ms5803", .data = &ms5803_data },
233	{ .compatible = "meas,ms5805", .data = &ms5805_data },
234	{ .compatible = "meas,ms5837", .data = &ms5837_data },
235	{ .compatible = "meas,ms8607-temppressure", .data = &ms8607_data },
236	{ },
237};
238MODULE_DEVICE_TABLE(of, ms5637_of_match);
239
240static struct i2c_driver ms5637_driver = {
241	.probe = ms5637_probe,
242	.id_table = ms5637_id,
243	.driver = {
244		   .name = "ms5637",
245		   .of_match_table = ms5637_of_match,
246		   },
247};
248
249module_i2c_driver(ms5637_driver);
250
251MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver");
252MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
253MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
254MODULE_LICENSE("GPL v2");
255MODULE_IMPORT_NS(IIO_MEAS_SPEC_SENSORS);
256