Commit | Line | Data |
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64a70c65 | 1 | /* |
1b75ce65 | 2 | * ms5637.c - Support for Measurement-Specialties ms5637 and ms8607 |
64a70c65 LT |
3 | * pressure & temperature sensor |
4 | * | |
5 | * Copyright (c) 2015 Measurement-Specialties | |
6 | * | |
7 | * Licensed under the GPL-2. | |
8 | * | |
9 | * (7-bit I2C slave address 0x76) | |
10 | * | |
11 | * Datasheet: | |
12 | * http://www.meas-spec.com/downloads/MS5637-02BA03.pdf | |
1b75ce65 LT |
13 | * Datasheet: |
14 | * http://www.meas-spec.com/downloads/MS8607-02BA01.pdf | |
64a70c65 | 15 | */ |
1b75ce65 | 16 | |
64a70c65 LT |
17 | #include <linux/init.h> |
18 | #include <linux/device.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/stat.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/i2c.h> | |
23 | #include <linux/iio/iio.h> | |
24 | #include <linux/iio/sysfs.h> | |
25 | #include <linux/mutex.h> | |
26 | ||
27 | #include "../common/ms_sensors/ms_sensors_i2c.h" | |
28 | ||
29 | static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 }; | |
30 | /* String copy of the above const for readability purpose */ | |
31 | static const char ms5637_show_samp_freq[] = "960 480 240 120 60 30"; | |
32 | ||
33 | static int ms5637_read_raw(struct iio_dev *indio_dev, | |
34 | struct iio_chan_spec const *channel, int *val, | |
35 | int *val2, long mask) | |
36 | { | |
37 | int ret; | |
38 | int temperature; | |
39 | unsigned int pressure; | |
40 | struct ms_tp_dev *dev_data = iio_priv(indio_dev); | |
41 | ||
42 | switch (mask) { | |
43 | case IIO_CHAN_INFO_PROCESSED: | |
44 | ret = ms_sensors_read_temp_and_pressure(dev_data, | |
45 | &temperature, | |
46 | &pressure); | |
47 | if (ret) | |
48 | return ret; | |
49 | ||
50 | switch (channel->type) { | |
51 | case IIO_TEMP: /* in milli °C */ | |
52 | *val = temperature; | |
53 | ||
54 | return IIO_VAL_INT; | |
55 | case IIO_PRESSURE: /* in kPa */ | |
56 | *val = pressure / 1000; | |
57 | *val2 = (pressure % 1000) * 1000; | |
58 | ||
59 | return IIO_VAL_INT_PLUS_MICRO; | |
60 | default: | |
61 | return -EINVAL; | |
62 | } | |
63 | case IIO_CHAN_INFO_SAMP_FREQ: | |
64 | *val = ms5637_samp_freq[dev_data->res_index]; | |
65 | ||
66 | return IIO_VAL_INT; | |
67 | default: | |
68 | return -EINVAL; | |
69 | } | |
70 | } | |
71 | ||
72 | static int ms5637_write_raw(struct iio_dev *indio_dev, | |
73 | struct iio_chan_spec const *chan, | |
74 | int val, int val2, long mask) | |
75 | { | |
76 | struct ms_tp_dev *dev_data = iio_priv(indio_dev); | |
77 | int i; | |
78 | ||
79 | switch (mask) { | |
80 | case IIO_CHAN_INFO_SAMP_FREQ: | |
81 | i = ARRAY_SIZE(ms5637_samp_freq); | |
82 | while (i-- > 0) | |
83 | if (val == ms5637_samp_freq[i]) | |
84 | break; | |
85 | if (i < 0) | |
86 | return -EINVAL; | |
87 | dev_data->res_index = i; | |
88 | ||
89 | return 0; | |
90 | default: | |
91 | return -EINVAL; | |
92 | } | |
93 | } | |
94 | ||
95 | static const struct iio_chan_spec ms5637_channels[] = { | |
96 | { | |
97 | .type = IIO_TEMP, | |
98 | .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), | |
99 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), | |
100 | }, | |
101 | { | |
102 | .type = IIO_PRESSURE, | |
103 | .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), | |
104 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), | |
105 | } | |
106 | }; | |
107 | ||
108 | static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq); | |
109 | ||
110 | static struct attribute *ms5637_attributes[] = { | |
111 | &iio_const_attr_sampling_frequency_available.dev_attr.attr, | |
112 | NULL, | |
113 | }; | |
114 | ||
115 | static const struct attribute_group ms5637_attribute_group = { | |
116 | .attrs = ms5637_attributes, | |
117 | }; | |
118 | ||
119 | static const struct iio_info ms5637_info = { | |
120 | .read_raw = ms5637_read_raw, | |
121 | .write_raw = ms5637_write_raw, | |
122 | .attrs = &ms5637_attribute_group, | |
123 | .driver_module = THIS_MODULE, | |
124 | }; | |
125 | ||
126 | static int ms5637_probe(struct i2c_client *client, | |
127 | const struct i2c_device_id *id) | |
128 | { | |
129 | struct ms_tp_dev *dev_data; | |
130 | struct iio_dev *indio_dev; | |
131 | int ret; | |
132 | ||
133 | if (!i2c_check_functionality(client->adapter, | |
134 | I2C_FUNC_SMBUS_READ_WORD_DATA | | |
135 | I2C_FUNC_SMBUS_WRITE_BYTE | | |
136 | I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { | |
137 | dev_err(&client->dev, | |
138 | "Adapter does not support some i2c transaction\n"); | |
f8d9d3b4 | 139 | return -EOPNOTSUPP; |
64a70c65 LT |
140 | } |
141 | ||
142 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data)); | |
143 | if (!indio_dev) | |
144 | return -ENOMEM; | |
145 | ||
146 | dev_data = iio_priv(indio_dev); | |
147 | dev_data->client = client; | |
148 | dev_data->res_index = 5; | |
149 | mutex_init(&dev_data->lock); | |
150 | ||
151 | indio_dev->info = &ms5637_info; | |
152 | indio_dev->name = id->name; | |
153 | indio_dev->dev.parent = &client->dev; | |
154 | indio_dev->modes = INDIO_DIRECT_MODE; | |
155 | indio_dev->channels = ms5637_channels; | |
156 | indio_dev->num_channels = ARRAY_SIZE(ms5637_channels); | |
157 | ||
158 | i2c_set_clientdata(client, indio_dev); | |
159 | ||
160 | ret = ms_sensors_reset(client, 0x1E, 3000); | |
161 | if (ret) | |
162 | return ret; | |
163 | ||
164 | ret = ms_sensors_tp_read_prom(dev_data); | |
165 | if (ret) | |
166 | return ret; | |
167 | ||
168 | return devm_iio_device_register(&client->dev, indio_dev); | |
169 | } | |
170 | ||
171 | static const struct i2c_device_id ms5637_id[] = { | |
172 | {"ms5637", 0}, | |
1b75ce65 | 173 | {"ms8607-temppressure", 1}, |
64a70c65 LT |
174 | {} |
175 | }; | |
176 | ||
177 | static struct i2c_driver ms5637_driver = { | |
178 | .probe = ms5637_probe, | |
179 | .id_table = ms5637_id, | |
180 | .driver = { | |
181 | .name = "ms5637" | |
182 | }, | |
183 | }; | |
184 | ||
185 | module_i2c_driver(ms5637_driver); | |
186 | ||
187 | MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver"); | |
188 | MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>"); | |
189 | MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>"); | |
190 | MODULE_LICENSE("GPL v2"); |