inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / iio / pressure / ms5637.c
blob953ffbc0ef96046546c81ce5c497e59a64cc4134
1 /*
2 * ms5637.c - Support for Measurement-Specialties MS5637, MS5805
3 * MS5837 and MS8607 pressure & temperature sensor
5 * Copyright (c) 2015 Measurement-Specialties
7 * Licensed under the GPL-2.
9 * (7-bit I2C slave address 0x76)
11 * Datasheet:
12 * http://www.meas-spec.com/downloads/MS5637-02BA03.pdf
13 * Datasheet:
14 * http://www.meas-spec.com/downloads/MS5805-02BA01.pdf
15 * Datasheet:
16 * http://www.meas-spec.com/downloads/MS5837-30BA.pdf
17 * Datasheet:
18 * http://www.meas-spec.com/downloads/MS8607-02BA01.pdf
21 #include <linux/init.h>
22 #include <linux/device.h>
23 #include <linux/kernel.h>
24 #include <linux/stat.h>
25 #include <linux/module.h>
26 #include <linux/i2c.h>
27 #include <linux/iio/iio.h>
28 #include <linux/iio/sysfs.h>
29 #include <linux/mutex.h>
31 #include "../common/ms_sensors/ms_sensors_i2c.h"
33 static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 };
34 /* String copy of the above const for readability purpose */
35 static const char ms5637_show_samp_freq[] = "960 480 240 120 60 30";
37 static int ms5637_read_raw(struct iio_dev *indio_dev,
38 struct iio_chan_spec const *channel, int *val,
39 int *val2, long mask)
41 int ret;
42 int temperature;
43 unsigned int pressure;
44 struct ms_tp_dev *dev_data = iio_priv(indio_dev);
46 switch (mask) {
47 case IIO_CHAN_INFO_PROCESSED:
48 ret = ms_sensors_read_temp_and_pressure(dev_data,
49 &temperature,
50 &pressure);
51 if (ret)
52 return ret;
54 switch (channel->type) {
55 case IIO_TEMP: /* in milli °C */
56 *val = temperature;
58 return IIO_VAL_INT;
59 case IIO_PRESSURE: /* in kPa */
60 *val = pressure / 1000;
61 *val2 = (pressure % 1000) * 1000;
63 return IIO_VAL_INT_PLUS_MICRO;
64 default:
65 return -EINVAL;
67 case IIO_CHAN_INFO_SAMP_FREQ:
68 *val = ms5637_samp_freq[dev_data->res_index];
70 return IIO_VAL_INT;
71 default:
72 return -EINVAL;
76 static int ms5637_write_raw(struct iio_dev *indio_dev,
77 struct iio_chan_spec const *chan,
78 int val, int val2, long mask)
80 struct ms_tp_dev *dev_data = iio_priv(indio_dev);
81 int i;
83 switch (mask) {
84 case IIO_CHAN_INFO_SAMP_FREQ:
85 i = ARRAY_SIZE(ms5637_samp_freq);
86 while (i-- > 0)
87 if (val == ms5637_samp_freq[i])
88 break;
89 if (i < 0)
90 return -EINVAL;
91 dev_data->res_index = i;
93 return 0;
94 default:
95 return -EINVAL;
99 static const struct iio_chan_spec ms5637_channels[] = {
101 .type = IIO_TEMP,
102 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
103 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
106 .type = IIO_PRESSURE,
107 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
108 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
112 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq);
114 static struct attribute *ms5637_attributes[] = {
115 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
116 NULL,
119 static const struct attribute_group ms5637_attribute_group = {
120 .attrs = ms5637_attributes,
123 static const struct iio_info ms5637_info = {
124 .read_raw = ms5637_read_raw,
125 .write_raw = ms5637_write_raw,
126 .attrs = &ms5637_attribute_group,
127 .driver_module = THIS_MODULE,
130 static int ms5637_probe(struct i2c_client *client,
131 const struct i2c_device_id *id)
133 struct ms_tp_dev *dev_data;
134 struct iio_dev *indio_dev;
135 int ret;
137 if (!i2c_check_functionality(client->adapter,
138 I2C_FUNC_SMBUS_READ_WORD_DATA |
139 I2C_FUNC_SMBUS_WRITE_BYTE |
140 I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
141 dev_err(&client->dev,
142 "Adapter does not support some i2c transaction\n");
143 return -EOPNOTSUPP;
146 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));
147 if (!indio_dev)
148 return -ENOMEM;
150 dev_data = iio_priv(indio_dev);
151 dev_data->client = client;
152 dev_data->res_index = 5;
153 mutex_init(&dev_data->lock);
155 indio_dev->info = &ms5637_info;
156 indio_dev->name = id->name;
157 indio_dev->dev.parent = &client->dev;
158 indio_dev->modes = INDIO_DIRECT_MODE;
159 indio_dev->channels = ms5637_channels;
160 indio_dev->num_channels = ARRAY_SIZE(ms5637_channels);
162 i2c_set_clientdata(client, indio_dev);
164 ret = ms_sensors_reset(client, 0x1E, 3000);
165 if (ret)
166 return ret;
168 ret = ms_sensors_tp_read_prom(dev_data);
169 if (ret)
170 return ret;
172 return devm_iio_device_register(&client->dev, indio_dev);
175 static const struct i2c_device_id ms5637_id[] = {
176 {"ms5637", 0},
177 {"ms5805", 0},
178 {"ms5837", 0},
179 {"ms8607-temppressure", 0},
182 MODULE_DEVICE_TABLE(i2c, ms5637_id);
184 static struct i2c_driver ms5637_driver = {
185 .probe = ms5637_probe,
186 .id_table = ms5637_id,
187 .driver = {
188 .name = "ms5637"
192 module_i2c_driver(ms5637_driver);
194 MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver");
195 MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
196 MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
197 MODULE_LICENSE("GPL v2");