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53bf4d06 LT |
1 | /* |
2 | * tsys02d.c - Support for Measurement-Specialties tsys02d temperature sensor | |
3 | * | |
4 | * Copyright (c) 2015 Measurement-Specialties | |
5 | * | |
6 | * Licensed under the GPL-2. | |
7 | * | |
8 | * (7-bit I2C slave address 0x40) | |
9 | * | |
10 | * Datasheet: | |
11 | * http://www.meas-spec.com/downloads/Digital_Sensor_TSYS02D.pdf | |
12 | */ | |
13 | ||
14 | #include <linux/init.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/stat.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/iio/iio.h> | |
20 | #include <linux/iio/sysfs.h> | |
21 | ||
22 | #include "../common/ms_sensors/ms_sensors_i2c.h" | |
23 | ||
24 | #define TSYS02D_RESET 0xFE | |
25 | ||
26 | static const int tsys02d_samp_freq[4] = { 20, 40, 70, 140 }; | |
27 | /* String copy of the above const for readability purpose */ | |
28 | static const char tsys02d_show_samp_freq[] = "20 40 70 140"; | |
29 | ||
30 | static int tsys02d_read_raw(struct iio_dev *indio_dev, | |
31 | struct iio_chan_spec const *channel, int *val, | |
32 | int *val2, long mask) | |
33 | { | |
34 | int ret; | |
35 | s32 temperature; | |
36 | struct ms_ht_dev *dev_data = iio_priv(indio_dev); | |
37 | ||
38 | switch (mask) { | |
39 | case IIO_CHAN_INFO_PROCESSED: | |
40 | switch (channel->type) { | |
41 | case IIO_TEMP: /* in milli °C */ | |
42 | ret = ms_sensors_ht_read_temperature(dev_data, | |
43 | &temperature); | |
44 | if (ret) | |
45 | return ret; | |
46 | *val = temperature; | |
47 | ||
48 | return IIO_VAL_INT; | |
49 | default: | |
50 | return -EINVAL; | |
51 | } | |
52 | case IIO_CHAN_INFO_SAMP_FREQ: | |
53 | *val = tsys02d_samp_freq[dev_data->res_index]; | |
54 | ||
55 | return IIO_VAL_INT; | |
56 | default: | |
57 | return -EINVAL; | |
58 | } | |
59 | } | |
60 | ||
61 | static int tsys02d_write_raw(struct iio_dev *indio_dev, | |
62 | struct iio_chan_spec const *chan, | |
63 | int val, int val2, long mask) | |
64 | { | |
65 | struct ms_ht_dev *dev_data = iio_priv(indio_dev); | |
66 | int i, ret; | |
67 | ||
68 | switch (mask) { | |
69 | case IIO_CHAN_INFO_SAMP_FREQ: | |
70 | i = ARRAY_SIZE(tsys02d_samp_freq); | |
71 | while (i-- > 0) | |
72 | if (val == tsys02d_samp_freq[i]) | |
73 | break; | |
74 | if (i < 0) | |
75 | return -EINVAL; | |
76 | mutex_lock(&dev_data->lock); | |
77 | dev_data->res_index = i; | |
78 | ret = ms_sensors_write_resolution(dev_data, i); | |
79 | mutex_unlock(&dev_data->lock); | |
80 | ||
81 | return ret; | |
82 | default: | |
83 | return -EINVAL; | |
84 | } | |
85 | } | |
86 | ||
87 | static const struct iio_chan_spec tsys02d_channels[] = { | |
88 | { | |
89 | .type = IIO_TEMP, | |
90 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED), | |
91 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), | |
92 | } | |
93 | }; | |
94 | ||
95 | static ssize_t tsys02_read_battery_low(struct device *dev, | |
96 | struct device_attribute *attr, | |
97 | char *buf) | |
98 | { | |
99 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
100 | struct ms_ht_dev *dev_data = iio_priv(indio_dev); | |
101 | ||
102 | return ms_sensors_show_battery_low(dev_data, buf); | |
103 | } | |
104 | ||
105 | static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(tsys02d_show_samp_freq); | |
106 | static IIO_DEVICE_ATTR(battery_low, S_IRUGO, | |
107 | tsys02_read_battery_low, NULL, 0); | |
108 | ||
109 | static struct attribute *tsys02d_attributes[] = { | |
110 | &iio_const_attr_sampling_frequency_available.dev_attr.attr, | |
111 | &iio_dev_attr_battery_low.dev_attr.attr, | |
112 | NULL, | |
113 | }; | |
114 | ||
115 | static const struct attribute_group tsys02d_attribute_group = { | |
116 | .attrs = tsys02d_attributes, | |
117 | }; | |
118 | ||
119 | static const struct iio_info tsys02d_info = { | |
120 | .read_raw = tsys02d_read_raw, | |
121 | .write_raw = tsys02d_write_raw, | |
122 | .attrs = &tsys02d_attribute_group, | |
123 | .driver_module = THIS_MODULE, | |
124 | }; | |
125 | ||
126 | static int tsys02d_probe(struct i2c_client *client, | |
127 | const struct i2c_device_id *id) | |
128 | { | |
129 | struct ms_ht_dev *dev_data; | |
130 | struct iio_dev *indio_dev; | |
131 | int ret; | |
132 | u64 serial_number; | |
133 | ||
134 | if (!i2c_check_functionality(client->adapter, | |
135 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA | | |
136 | I2C_FUNC_SMBUS_WRITE_BYTE | | |
137 | I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { | |
138 | dev_err(&client->dev, | |
139 | "Adapter does not support some i2c transaction\n"); | |
140 | return -ENODEV; | |
141 | } | |
142 | ||
143 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data)); | |
144 | if (!indio_dev) | |
145 | return -ENOMEM; | |
146 | ||
147 | dev_data = iio_priv(indio_dev); | |
148 | dev_data->client = client; | |
149 | dev_data->res_index = 0; | |
150 | mutex_init(&dev_data->lock); | |
151 | ||
152 | indio_dev->info = &tsys02d_info; | |
153 | indio_dev->name = id->name; | |
154 | indio_dev->dev.parent = &client->dev; | |
155 | indio_dev->modes = INDIO_DIRECT_MODE; | |
156 | indio_dev->channels = tsys02d_channels; | |
157 | indio_dev->num_channels = ARRAY_SIZE(tsys02d_channels); | |
158 | ||
159 | i2c_set_clientdata(client, indio_dev); | |
160 | ||
161 | ret = ms_sensors_reset(client, TSYS02D_RESET, 15000); | |
162 | if (ret) | |
163 | return ret; | |
164 | ||
165 | ret = ms_sensors_read_serial(client, &serial_number); | |
166 | if (ret) | |
167 | return ret; | |
168 | dev_info(&client->dev, "Serial number : %llx", serial_number); | |
169 | ||
170 | return devm_iio_device_register(&client->dev, indio_dev); | |
171 | } | |
172 | ||
173 | static const struct i2c_device_id tsys02d_id[] = { | |
174 | {"tsys02d", 0}, | |
175 | {} | |
176 | }; | |
177 | ||
178 | static struct i2c_driver tsys02d_driver = { | |
179 | .probe = tsys02d_probe, | |
180 | .id_table = tsys02d_id, | |
181 | .driver = { | |
182 | .name = "tsys02d", | |
183 | }, | |
184 | }; | |
185 | ||
186 | module_i2c_driver(tsys02d_driver); | |
187 | ||
188 | MODULE_DESCRIPTION("Measurement-Specialties tsys02d temperature driver"); | |
189 | MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>"); | |
190 | MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>"); | |
191 | MODULE_LICENSE("GPL v2"); |