1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
|
// 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 <william.markezana@meas-spec.com>");
MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(IIO_MEAS_SPEC_SENSORS);
|
