This source file includes following definitions.
- ms5637_read_raw
- ms5637_write_raw
- ms5637_probe
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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 static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 };
33
34 static const char ms5637_show_samp_freq[] = "960 480 240 120 60 30";
35
36 static int ms5637_read_raw(struct iio_dev *indio_dev,
37 struct iio_chan_spec const *channel, int *val,
38 int *val2, long mask)
39 {
40 int ret;
41 int temperature;
42 unsigned int pressure;
43 struct ms_tp_dev *dev_data = iio_priv(indio_dev);
44
45 switch (mask) {
46 case IIO_CHAN_INFO_PROCESSED:
47 ret = ms_sensors_read_temp_and_pressure(dev_data,
48 &temperature,
49 &pressure);
50 if (ret)
51 return ret;
52
53 switch (channel->type) {
54 case IIO_TEMP:
55 *val = temperature;
56
57 return IIO_VAL_INT;
58 case IIO_PRESSURE:
59 *val = pressure / 1000;
60 *val2 = (pressure % 1000) * 1000;
61
62 return IIO_VAL_INT_PLUS_MICRO;
63 default:
64 return -EINVAL;
65 }
66 case IIO_CHAN_INFO_SAMP_FREQ:
67 *val = ms5637_samp_freq[dev_data->res_index];
68
69 return IIO_VAL_INT;
70 default:
71 return -EINVAL;
72 }
73 }
74
75 static int ms5637_write_raw(struct iio_dev *indio_dev,
76 struct iio_chan_spec const *chan,
77 int val, int val2, long mask)
78 {
79 struct ms_tp_dev *dev_data = iio_priv(indio_dev);
80 int i;
81
82 switch (mask) {
83 case IIO_CHAN_INFO_SAMP_FREQ:
84 i = ARRAY_SIZE(ms5637_samp_freq);
85 while (i-- > 0)
86 if (val == ms5637_samp_freq[i])
87 break;
88 if (i < 0)
89 return -EINVAL;
90 dev_data->res_index = i;
91
92 return 0;
93 default:
94 return -EINVAL;
95 }
96 }
97
98 static const struct iio_chan_spec ms5637_channels[] = {
99 {
100 .type = IIO_TEMP,
101 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
102 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
103 },
104 {
105 .type = IIO_PRESSURE,
106 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
107 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
108 }
109 };
110
111 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq);
112
113 static struct attribute *ms5637_attributes[] = {
114 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
115 NULL,
116 };
117
118 static const struct attribute_group ms5637_attribute_group = {
119 .attrs = ms5637_attributes,
120 };
121
122 static const struct iio_info ms5637_info = {
123 .read_raw = ms5637_read_raw,
124 .write_raw = ms5637_write_raw,
125 .attrs = &ms5637_attribute_group,
126 };
127
128 static int ms5637_probe(struct i2c_client *client,
129 const struct i2c_device_id *id)
130 {
131 struct ms_tp_dev *dev_data;
132 struct iio_dev *indio_dev;
133 int ret;
134
135 if (!i2c_check_functionality(client->adapter,
136 I2C_FUNC_SMBUS_READ_WORD_DATA |
137 I2C_FUNC_SMBUS_WRITE_BYTE |
138 I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
139 dev_err(&client->dev,
140 "Adapter does not support some i2c transaction\n");
141 return -EOPNOTSUPP;
142 }
143
144 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));
145 if (!indio_dev)
146 return -ENOMEM;
147
148 dev_data = iio_priv(indio_dev);
149 dev_data->client = client;
150 dev_data->res_index = 5;
151 mutex_init(&dev_data->lock);
152
153 indio_dev->info = &ms5637_info;
154 indio_dev->name = id->name;
155 indio_dev->dev.parent = &client->dev;
156 indio_dev->modes = INDIO_DIRECT_MODE;
157 indio_dev->channels = ms5637_channels;
158 indio_dev->num_channels = ARRAY_SIZE(ms5637_channels);
159
160 i2c_set_clientdata(client, indio_dev);
161
162 ret = ms_sensors_reset(client, 0x1E, 3000);
163 if (ret)
164 return ret;
165
166 ret = ms_sensors_tp_read_prom(dev_data);
167 if (ret)
168 return ret;
169
170 return devm_iio_device_register(&client->dev, indio_dev);
171 }
172
173 static const struct i2c_device_id ms5637_id[] = {
174 {"ms5637", 0},
175 {"ms5805", 0},
176 {"ms5837", 0},
177 {"ms8607-temppressure", 0},
178 {}
179 };
180 MODULE_DEVICE_TABLE(i2c, ms5637_id);
181
182 static const struct of_device_id ms5637_of_match[] = {
183 { .compatible = "meas,ms5637", },
184 { .compatible = "meas,ms5805", },
185 { .compatible = "meas,ms5837", },
186 { .compatible = "meas,ms8607-temppressure", },
187 { },
188 };
189 MODULE_DEVICE_TABLE(of, ms5637_of_match);
190
191 static struct i2c_driver ms5637_driver = {
192 .probe = ms5637_probe,
193 .id_table = ms5637_id,
194 .driver = {
195 .name = "ms5637",
196 .of_match_table = of_match_ptr(ms5637_of_match),
197 },
198 };
199
200 module_i2c_driver(ms5637_driver);
201
202 MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver");
203 MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
204 MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
205 MODULE_LICENSE("GPL v2");