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 | |
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, at: len, fmt: "%u " , ms5637_samp_freq[i]); |
48 | sysfs_emit_at(buf, at: len - 1, fmt: "\n" ); |
49 | |
50 | return len; |
51 | } |
52 | |
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: &temperature, |
66 | pressure: &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 | |
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 | |
145 | static int ms5637_probe(struct i2c_client *client) |
146 | { |
147 | const struct ms_tp_data *data; |
148 | struct ms_tp_dev *dev_data; |
149 | struct iio_dev *indio_dev; |
150 | int ret; |
151 | |
152 | if (!i2c_check_functionality(adap: client->adapter, |
153 | I2C_FUNC_SMBUS_READ_WORD_DATA | |
154 | I2C_FUNC_SMBUS_WRITE_BYTE | |
155 | I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { |
156 | dev_err(&client->dev, |
157 | "Adapter does not support some i2c transaction\n" ); |
158 | return -EOPNOTSUPP; |
159 | } |
160 | |
161 | data = i2c_get_match_data(client); |
162 | if (!data) |
163 | return -EINVAL; |
164 | |
165 | indio_dev = devm_iio_device_alloc(parent: &client->dev, sizeof_priv: sizeof(*dev_data)); |
166 | if (!indio_dev) |
167 | return -ENOMEM; |
168 | |
169 | dev_data = iio_priv(indio_dev); |
170 | dev_data->client = client; |
171 | dev_data->res_index = data->hw->max_res_index; |
172 | dev_data->hw = data->hw; |
173 | mutex_init(&dev_data->lock); |
174 | |
175 | indio_dev->info = &ms5637_info; |
176 | indio_dev->name = data->name; |
177 | indio_dev->modes = INDIO_DIRECT_MODE; |
178 | indio_dev->channels = ms5637_channels; |
179 | indio_dev->num_channels = ARRAY_SIZE(ms5637_channels); |
180 | |
181 | i2c_set_clientdata(client, data: indio_dev); |
182 | |
183 | ret = ms_sensors_reset(cli: client, cmd: 0x1E, delay: 3000); |
184 | if (ret) |
185 | return ret; |
186 | |
187 | ret = ms_sensors_tp_read_prom(dev_data); |
188 | if (ret) |
189 | return ret; |
190 | |
191 | return devm_iio_device_register(&client->dev, indio_dev); |
192 | } |
193 | |
194 | static const struct ms_tp_hw_data ms5637_hw_data = { |
195 | .prom_len = 7, |
196 | .max_res_index = 5 |
197 | }; |
198 | |
199 | static const struct ms_tp_hw_data ms5803_hw_data = { |
200 | .prom_len = 8, |
201 | .max_res_index = 4 |
202 | }; |
203 | |
204 | static const struct ms_tp_data ms5637_data = { .name = "ms5637" , .hw = &ms5637_hw_data }; |
205 | |
206 | static const struct ms_tp_data ms5803_data = { .name = "ms5803" , .hw = &ms5803_hw_data }; |
207 | |
208 | static const struct ms_tp_data ms5805_data = { .name = "ms5805" , .hw = &ms5637_hw_data }; |
209 | |
210 | static const struct ms_tp_data ms5837_data = { .name = "ms5837" , .hw = &ms5637_hw_data }; |
211 | |
212 | static const struct ms_tp_data ms8607_data = { |
213 | .name = "ms8607-temppressure" , |
214 | .hw = &ms5637_hw_data, |
215 | }; |
216 | |
217 | static const struct i2c_device_id ms5637_id[] = { |
218 | {"ms5637" , (kernel_ulong_t)&ms5637_data }, |
219 | {"ms5805" , (kernel_ulong_t)&ms5805_data }, |
220 | {"ms5837" , (kernel_ulong_t)&ms5837_data }, |
221 | {"ms8607-temppressure" , (kernel_ulong_t)&ms8607_data }, |
222 | {} |
223 | }; |
224 | MODULE_DEVICE_TABLE(i2c, ms5637_id); |
225 | |
226 | static const struct of_device_id ms5637_of_match[] = { |
227 | { .compatible = "meas,ms5637" , .data = &ms5637_data }, |
228 | { .compatible = "meas,ms5803" , .data = &ms5803_data }, |
229 | { .compatible = "meas,ms5805" , .data = &ms5805_data }, |
230 | { .compatible = "meas,ms5837" , .data = &ms5837_data }, |
231 | { .compatible = "meas,ms8607-temppressure" , .data = &ms8607_data }, |
232 | { }, |
233 | }; |
234 | MODULE_DEVICE_TABLE(of, ms5637_of_match); |
235 | |
236 | static struct i2c_driver ms5637_driver = { |
237 | .probe = ms5637_probe, |
238 | .id_table = ms5637_id, |
239 | .driver = { |
240 | .name = "ms5637" , |
241 | .of_match_table = ms5637_of_match, |
242 | }, |
243 | }; |
244 | |
245 | module_i2c_driver(ms5637_driver); |
246 | |
247 | MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver" ); |
248 | MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>" ); |
249 | MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>" ); |
250 | MODULE_LICENSE("GPL v2" ); |
251 | MODULE_IMPORT_NS(IIO_MEAS_SPEC_SENSORS); |
252 | |