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
33 struct ms_tp_data {
34 const char *name;
35 const struct ms_tp_hw_data *hw;
36 };
37
38 static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 };
39
ms5637_show_samp_freq(struct device * dev,struct device_attribute * attr,char * buf)40 static 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
ms5637_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * channel,int * val,int * val2,long mask)53 static 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
ms5637_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)92 static 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
115 static 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
128 static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq);
129
130 static struct attribute *ms5637_attributes[] = {
131 &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
132 NULL,
133 };
134
135 static const struct attribute_group ms5637_attribute_group = {
136 .attrs = ms5637_attributes,
137 };
138
139 static 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
ms5637_probe(struct i2c_client * client)145 static 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
198 static const struct ms_tp_hw_data ms5637_hw_data = {
199 .prom_len = 7,
200 .max_res_index = 5
201 };
202
203 static const struct ms_tp_hw_data ms5803_hw_data = {
204 .prom_len = 8,
205 .max_res_index = 4
206 };
207
208 static const struct ms_tp_data ms5637_data = { .name = "ms5637", .hw = &ms5637_hw_data };
209
210 static const struct ms_tp_data ms5803_data = { .name = "ms5803", .hw = &ms5803_hw_data };
211
212 static const struct ms_tp_data ms5805_data = { .name = "ms5805", .hw = &ms5637_hw_data };
213
214 static const struct ms_tp_data ms5837_data = { .name = "ms5837", .hw = &ms5637_hw_data };
215
216 static const struct ms_tp_data ms8607_data = {
217 .name = "ms8607-temppressure",
218 .hw = &ms5637_hw_data,
219 };
220
221 static 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 };
228 MODULE_DEVICE_TABLE(i2c, ms5637_id);
229
230 static 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 };
238 MODULE_DEVICE_TABLE(of, ms5637_of_match);
239
240 static 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
249 module_i2c_driver(ms5637_driver);
250
251 MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver");
252 MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
253 MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
254 MODULE_LICENSE("GPL v2");
255 MODULE_IMPORT_NS(IIO_MEAS_SPEC_SENSORS);
256