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/i2c.h>
26 #include <linux/iio/iio.h>
27 #include <linux/iio/sysfs.h>
28 #include <linux/mutex.h>
29
30 #include "../common/ms_sensors/ms_sensors_i2c.h"
31
32 struct ms_tp_data {
33 const char *name;
34 const struct ms_tp_hw_data *hw;
35 };
36
37 static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 };
38
ms5637_show_samp_freq(struct device * dev,struct device_attribute * attr,char * buf)39 static ssize_t ms5637_show_samp_freq(struct device *dev, struct device_attribute *attr, char *buf)
40 {
41 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
42 struct ms_tp_dev *dev_data = iio_priv(indio_dev);
43 int i, len = 0;
44
45 for (i = 0; i <= dev_data->hw->max_res_index; i++)
46 len += sysfs_emit_at(buf, len, "%u ", ms5637_samp_freq[i]);
47 sysfs_emit_at(buf, len - 1, "\n");
48
49 return len;
50 }
51
ms5637_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * channel,int * val,int * val2,long mask)52 static int ms5637_read_raw(struct iio_dev *indio_dev,
53 struct iio_chan_spec const *channel, int *val,
54 int *val2, long mask)
55 {
56 int ret;
57 int temperature;
58 unsigned int pressure;
59 struct ms_tp_dev *dev_data = iio_priv(indio_dev);
60
61 switch (mask) {
62 case IIO_CHAN_INFO_PROCESSED:
63 ret = ms_sensors_read_temp_and_pressure(dev_data,
64 &temperature,
65 &pressure);
66 if (ret)
67 return ret;
68
69 switch (channel->type) {
70 case IIO_TEMP: /* in milli °C */
71 *val = temperature;
72
73 return IIO_VAL_INT;
74 case IIO_PRESSURE: /* in kPa */
75 *val = pressure / 1000;
76 *val2 = (pressure % 1000) * 1000;
77
78 return IIO_VAL_INT_PLUS_MICRO;
79 default:
80 return -EINVAL;
81 }
82 case IIO_CHAN_INFO_SAMP_FREQ:
83 *val = ms5637_samp_freq[dev_data->res_index];
84
85 return IIO_VAL_INT;
86 default:
87 return -EINVAL;
88 }
89 }
90
ms5637_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)91 static int ms5637_write_raw(struct iio_dev *indio_dev,
92 struct iio_chan_spec const *chan,
93 int val, int val2, long mask)
94 {
95 struct ms_tp_dev *dev_data = iio_priv(indio_dev);
96 int i;
97
98 switch (mask) {
99 case IIO_CHAN_INFO_SAMP_FREQ:
100 i = ARRAY_SIZE(ms5637_samp_freq);
101 while (i-- > 0)
102 if (val == ms5637_samp_freq[i])
103 break;
104 if (i < 0)
105 return -EINVAL;
106 dev_data->res_index = i;
107
108 return 0;
109 default:
110 return -EINVAL;
111 }
112 }
113
114 static const struct iio_chan_spec ms5637_channels[] = {
115 {
116 .type = IIO_TEMP,
117 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
118 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
119 },
120 {
121 .type = IIO_PRESSURE,
122 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
123 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
124 }
125 };
126
127 static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq);
128
129 static struct attribute *ms5637_attributes[] = {
130 &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
131 NULL,
132 };
133
134 static const struct attribute_group ms5637_attribute_group = {
135 .attrs = ms5637_attributes,
136 };
137
138 static const struct iio_info ms5637_info = {
139 .read_raw = ms5637_read_raw,
140 .write_raw = ms5637_write_raw,
141 .attrs = &ms5637_attribute_group,
142 };
143
ms5637_probe(struct i2c_client * client)144 static int ms5637_probe(struct i2c_client *client)
145 {
146 const struct ms_tp_data *data;
147 struct ms_tp_dev *dev_data;
148 struct iio_dev *indio_dev;
149 int ret;
150
151 if (!i2c_check_functionality(client->adapter,
152 I2C_FUNC_SMBUS_READ_WORD_DATA |
153 I2C_FUNC_SMBUS_WRITE_BYTE |
154 I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
155 dev_err(&client->dev,
156 "Adapter does not support some i2c transaction\n");
157 return -EOPNOTSUPP;
158 }
159
160 data = i2c_get_match_data(client);
161 if (!data)
162 return -EINVAL;
163
164 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));
165 if (!indio_dev)
166 return -ENOMEM;
167
168 dev_data = iio_priv(indio_dev);
169 dev_data->client = client;
170 dev_data->res_index = data->hw->max_res_index;
171 dev_data->hw = data->hw;
172 mutex_init(&dev_data->lock);
173
174 indio_dev->info = &ms5637_info;
175 indio_dev->name = data->name;
176 indio_dev->modes = INDIO_DIRECT_MODE;
177 indio_dev->channels = ms5637_channels;
178 indio_dev->num_channels = ARRAY_SIZE(ms5637_channels);
179
180 i2c_set_clientdata(client, indio_dev);
181
182 ret = ms_sensors_reset(client, 0x1E, 3000);
183 if (ret)
184 return ret;
185
186 ret = ms_sensors_tp_read_prom(dev_data);
187 if (ret)
188 return ret;
189
190 return devm_iio_device_register(&client->dev, indio_dev);
191 }
192
193 static const struct ms_tp_hw_data ms5637_hw_data = {
194 .prom_len = 7,
195 .max_res_index = 5
196 };
197
198 static const struct ms_tp_hw_data ms5803_hw_data = {
199 .prom_len = 8,
200 .max_res_index = 4
201 };
202
203 static const struct ms_tp_data ms5637_data = { .name = "ms5637", .hw = &ms5637_hw_data };
204
205 static const struct ms_tp_data ms5803_data = { .name = "ms5803", .hw = &ms5803_hw_data };
206
207 static const struct ms_tp_data ms5805_data = { .name = "ms5805", .hw = &ms5637_hw_data };
208
209 static const struct ms_tp_data ms5837_data = { .name = "ms5837", .hw = &ms5637_hw_data };
210
211 static const struct ms_tp_data ms8607_data = {
212 .name = "ms8607-temppressure",
213 .hw = &ms5637_hw_data,
214 };
215
216 static const struct i2c_device_id ms5637_id[] = {
217 { .name = "ms5637", .driver_data = (kernel_ulong_t)&ms5637_data },
218 { .name = "ms5805", .driver_data = (kernel_ulong_t)&ms5805_data },
219 { .name = "ms5837", .driver_data = (kernel_ulong_t)&ms5837_data },
220 { .name = "ms8607-temppressure", .driver_data = (kernel_ulong_t)&ms8607_data },
221 { }
222 };
223 MODULE_DEVICE_TABLE(i2c, ms5637_id);
224
225 static const struct of_device_id ms5637_of_match[] = {
226 { .compatible = "meas,ms5637", .data = &ms5637_data },
227 { .compatible = "meas,ms5803", .data = &ms5803_data },
228 { .compatible = "meas,ms5805", .data = &ms5805_data },
229 { .compatible = "meas,ms5837", .data = &ms5837_data },
230 { .compatible = "meas,ms8607-temppressure", .data = &ms8607_data },
231 { }
232 };
233 MODULE_DEVICE_TABLE(of, ms5637_of_match);
234
235 static struct i2c_driver ms5637_driver = {
236 .probe = ms5637_probe,
237 .id_table = ms5637_id,
238 .driver = {
239 .name = "ms5637",
240 .of_match_table = ms5637_of_match,
241 },
242 };
243
244 module_i2c_driver(ms5637_driver);
245
246 MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver");
247 MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
248 MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
249 MODULE_LICENSE("GPL v2");
250 MODULE_IMPORT_NS("IIO_MEAS_SPEC_SENSORS");
251