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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
29static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 };
30
31static const char ms5637_show_samp_freq[] = "960 480 240 120 60 30";
32
33static 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:
52 *val = temperature;
53
54 return IIO_VAL_INT;
55 case IIO_PRESSURE:
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
72static 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
95static 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
108static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq);
109
110static struct attribute *ms5637_attributes[] = {
111 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
112 NULL,
113};
114
115static const struct attribute_group ms5637_attribute_group = {
116 .attrs = ms5637_attributes,
117};
118
119static 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
126static 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");
139 return -EOPNOTSUPP;
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
171static const struct i2c_device_id ms5637_id[] = {
172 {"ms5637", 0},
173 {"ms8607-temppressure", 1},
174 {}
175};
176
177static struct i2c_driver ms5637_driver = {
178 .probe = ms5637_probe,
179 .id_table = ms5637_id,
180 .driver = {
181 .name = "ms5637"
182 },
183};
184
185module_i2c_driver(ms5637_driver);
186
187MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver");
188MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
189MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
190MODULE_LICENSE("GPL v2");
191
