]>
Commit | Line | Data |
---|---|---|
aab9ba7e PM |
1 | /* |
2 | * tsl4531.c - Support for TAOS TSL4531 ambient light sensor | |
3 | * | |
4 | * Copyright 2013 Peter Meerwald <pmeerw@pmeerw.net> | |
5 | * | |
6 | * This file is subject to the terms and conditions of version 2 of | |
7 | * the GNU General Public License. See the file COPYING in the main | |
8 | * directory of this archive for more details. | |
9 | * | |
10 | * IIO driver for the TSL4531x family | |
11 | * TSL45311/TSL45313: 7-bit I2C slave address 0x39 | |
12 | * TSL45315/TSL45317: 7-bit I2C slave address 0x29 | |
13 | * | |
14 | * TODO: single cycle measurement | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/i2c.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/delay.h> | |
21 | ||
22 | #include <linux/iio/iio.h> | |
23 | #include <linux/iio/sysfs.h> | |
24 | ||
25 | #define TSL4531_DRV_NAME "tsl4531" | |
26 | ||
6b57573b | 27 | #define TSL4531_COMMAND BIT(7) |
aab9ba7e | 28 | |
6b57573b PM |
29 | #define TSL4531_CONTROL (TSL4531_COMMAND | 0x00) |
30 | #define TSL4531_CONFIG (TSL4531_COMMAND | 0x01) | |
31 | #define TSL4531_DATA (TSL4531_COMMAND | 0x04) | |
32 | #define TSL4531_ID (TSL4531_COMMAND | 0x0a) | |
aab9ba7e PM |
33 | |
34 | /* operating modes in control register */ | |
35 | #define TSL4531_MODE_POWERDOWN 0x00 | |
36 | #define TSL4531_MODE_SINGLE_ADC 0x02 | |
37 | #define TSL4531_MODE_NORMAL 0x03 | |
38 | ||
39 | /* integration time control in config register */ | |
40 | #define TSL4531_TCNTRL_400MS 0x00 | |
41 | #define TSL4531_TCNTRL_200MS 0x01 | |
42 | #define TSL4531_TCNTRL_100MS 0x02 | |
43 | ||
44 | /* part number in id register */ | |
45 | #define TSL45311_ID 0x8 | |
46 | #define TSL45313_ID 0x9 | |
47 | #define TSL45315_ID 0xa | |
48 | #define TSL45317_ID 0xb | |
49 | #define TSL4531_ID_SHIFT 4 | |
50 | ||
51 | struct tsl4531_data { | |
52 | struct i2c_client *client; | |
53 | struct mutex lock; | |
54 | int int_time; | |
55 | }; | |
56 | ||
57 | static IIO_CONST_ATTR_INT_TIME_AVAIL("0.1 0.2 0.4"); | |
58 | ||
59 | static struct attribute *tsl4531_attributes[] = { | |
60 | &iio_const_attr_integration_time_available.dev_attr.attr, | |
61 | NULL | |
62 | }; | |
63 | ||
64 | static const struct attribute_group tsl4531_attribute_group = { | |
65 | .attrs = tsl4531_attributes, | |
66 | }; | |
67 | ||
68 | static const struct iio_chan_spec tsl4531_channels[] = { | |
69 | { | |
70 | .type = IIO_LIGHT, | |
71 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | | |
72 | BIT(IIO_CHAN_INFO_SCALE) | | |
73 | BIT(IIO_CHAN_INFO_INT_TIME) | |
74 | } | |
75 | }; | |
76 | ||
77 | static int tsl4531_read_raw(struct iio_dev *indio_dev, | |
78 | struct iio_chan_spec const *chan, | |
79 | int *val, int *val2, long mask) | |
80 | { | |
81 | struct tsl4531_data *data = iio_priv(indio_dev); | |
82 | int ret; | |
83 | ||
84 | switch (mask) { | |
85 | case IIO_CHAN_INFO_RAW: | |
86 | ret = i2c_smbus_read_word_data(data->client, | |
87 | TSL4531_DATA); | |
88 | if (ret < 0) | |
89 | return ret; | |
90 | *val = ret; | |
91 | return IIO_VAL_INT; | |
92 | case IIO_CHAN_INFO_SCALE: | |
93 | /* 0.. 1x, 1 .. 2x, 2 .. 4x */ | |
94 | *val = 1 << data->int_time; | |
95 | return IIO_VAL_INT; | |
96 | case IIO_CHAN_INFO_INT_TIME: | |
97 | if (data->int_time == 0) | |
98 | *val2 = 400000; | |
99 | else if (data->int_time == 1) | |
100 | *val2 = 200000; | |
101 | else if (data->int_time == 2) | |
102 | *val2 = 100000; | |
103 | else | |
104 | return -EINVAL; | |
105 | *val = 0; | |
106 | return IIO_VAL_INT_PLUS_MICRO; | |
107 | default: | |
108 | return -EINVAL; | |
109 | } | |
110 | } | |
111 | ||
112 | static int tsl4531_write_raw(struct iio_dev *indio_dev, | |
113 | struct iio_chan_spec const *chan, | |
114 | int val, int val2, long mask) | |
115 | { | |
116 | struct tsl4531_data *data = iio_priv(indio_dev); | |
117 | int int_time, ret; | |
118 | ||
119 | switch (mask) { | |
120 | case IIO_CHAN_INFO_INT_TIME: | |
121 | if (val != 0) | |
122 | return -EINVAL; | |
123 | if (val2 == 400000) | |
124 | int_time = 0; | |
125 | else if (val2 == 200000) | |
126 | int_time = 1; | |
127 | else if (val2 == 100000) | |
128 | int_time = 2; | |
129 | else | |
130 | return -EINVAL; | |
131 | mutex_lock(&data->lock); | |
132 | ret = i2c_smbus_write_byte_data(data->client, | |
133 | TSL4531_CONFIG, int_time); | |
134 | if (ret >= 0) | |
135 | data->int_time = int_time; | |
136 | mutex_unlock(&data->lock); | |
137 | return ret; | |
138 | default: | |
139 | return -EINVAL; | |
140 | } | |
141 | } | |
142 | ||
143 | static const struct iio_info tsl4531_info = { | |
144 | .read_raw = tsl4531_read_raw, | |
145 | .write_raw = tsl4531_write_raw, | |
146 | .attrs = &tsl4531_attribute_group, | |
147 | .driver_module = THIS_MODULE, | |
148 | }; | |
149 | ||
150 | static int tsl4531_check_id(struct i2c_client *client) | |
151 | { | |
152 | int ret = i2c_smbus_read_byte_data(client, TSL4531_ID); | |
153 | if (ret < 0) | |
154 | return ret; | |
155 | ||
156 | switch (ret >> TSL4531_ID_SHIFT) { | |
157 | case TSL45311_ID: | |
158 | case TSL45313_ID: | |
159 | case TSL45315_ID: | |
160 | case TSL45317_ID: | |
161 | return 1; | |
162 | default: | |
163 | return 0; | |
164 | } | |
165 | } | |
166 | ||
167 | static int tsl4531_probe(struct i2c_client *client, | |
168 | const struct i2c_device_id *id) | |
169 | { | |
170 | struct tsl4531_data *data; | |
171 | struct iio_dev *indio_dev; | |
172 | int ret; | |
173 | ||
174 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); | |
175 | if (!indio_dev) | |
176 | return -ENOMEM; | |
177 | ||
178 | data = iio_priv(indio_dev); | |
179 | i2c_set_clientdata(client, indio_dev); | |
180 | data->client = client; | |
181 | mutex_init(&data->lock); | |
182 | ||
183 | if (!tsl4531_check_id(client)) { | |
184 | dev_err(&client->dev, "no TSL4531 sensor\n"); | |
185 | return -ENODEV; | |
186 | } | |
187 | ||
188 | ret = i2c_smbus_write_byte_data(data->client, TSL4531_CONTROL, | |
189 | TSL4531_MODE_NORMAL); | |
190 | if (ret < 0) | |
191 | return ret; | |
192 | ||
193 | ret = i2c_smbus_write_byte_data(data->client, TSL4531_CONFIG, | |
194 | TSL4531_TCNTRL_400MS); | |
195 | if (ret < 0) | |
196 | return ret; | |
197 | ||
198 | indio_dev->dev.parent = &client->dev; | |
199 | indio_dev->info = &tsl4531_info; | |
200 | indio_dev->channels = tsl4531_channels; | |
201 | indio_dev->num_channels = ARRAY_SIZE(tsl4531_channels); | |
202 | indio_dev->name = TSL4531_DRV_NAME; | |
203 | indio_dev->modes = INDIO_DIRECT_MODE; | |
204 | ||
205 | return iio_device_register(indio_dev); | |
206 | } | |
207 | ||
208 | static int tsl4531_powerdown(struct i2c_client *client) | |
209 | { | |
210 | return i2c_smbus_write_byte_data(client, TSL4531_CONTROL, | |
211 | TSL4531_MODE_POWERDOWN); | |
212 | } | |
213 | ||
214 | static int tsl4531_remove(struct i2c_client *client) | |
215 | { | |
216 | iio_device_unregister(i2c_get_clientdata(client)); | |
217 | tsl4531_powerdown(client); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | #ifdef CONFIG_PM_SLEEP | |
223 | static int tsl4531_suspend(struct device *dev) | |
224 | { | |
225 | return tsl4531_powerdown(to_i2c_client(dev)); | |
226 | } | |
227 | ||
228 | static int tsl4531_resume(struct device *dev) | |
229 | { | |
230 | return i2c_smbus_write_byte_data(to_i2c_client(dev), TSL4531_CONTROL, | |
231 | TSL4531_MODE_NORMAL); | |
232 | } | |
aab9ba7e PM |
233 | |
234 | static SIMPLE_DEV_PM_OPS(tsl4531_pm_ops, tsl4531_suspend, tsl4531_resume); | |
03045bcf DM |
235 | #define TSL4531_PM_OPS (&tsl4531_pm_ops) |
236 | #else | |
237 | #define TSL4531_PM_OPS NULL | |
238 | #endif | |
aab9ba7e PM |
239 | |
240 | static const struct i2c_device_id tsl4531_id[] = { | |
241 | { "tsl4531", 0 }, | |
242 | { } | |
243 | }; | |
244 | MODULE_DEVICE_TABLE(i2c, tsl4531_id); | |
245 | ||
246 | static struct i2c_driver tsl4531_driver = { | |
247 | .driver = { | |
248 | .name = TSL4531_DRV_NAME, | |
03045bcf | 249 | .pm = TSL4531_PM_OPS, |
aab9ba7e PM |
250 | }, |
251 | .probe = tsl4531_probe, | |
252 | .remove = tsl4531_remove, | |
253 | .id_table = tsl4531_id, | |
254 | }; | |
255 | ||
256 | module_i2c_driver(tsl4531_driver); | |
257 | ||
258 | MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); | |
259 | MODULE_DESCRIPTION("TAOS TSL4531 ambient light sensors driver"); | |
260 | MODULE_LICENSE("GPL"); |