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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
27#define TSL4531_COMMAND BIT(7)
28
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)
33
34
35#define TSL4531_MODE_POWERDOWN 0x00
36#define TSL4531_MODE_SINGLE_ADC 0x02
37#define TSL4531_MODE_NORMAL 0x03
38
39
40#define TSL4531_TCNTRL_400MS 0x00
41#define TSL4531_TCNTRL_200MS 0x01
42#define TSL4531_TCNTRL_100MS 0x02
43
44
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
51struct tsl4531_data {
52 struct i2c_client *client;
53 struct mutex lock;
54 int int_time;
55};
56
57static IIO_CONST_ATTR_INT_TIME_AVAIL("0.1 0.2 0.4");
58
59static struct attribute *tsl4531_attributes[] = {
60 &iio_const_attr_integration_time_available.dev_attr.attr,
61 NULL
62};
63
64static const struct attribute_group tsl4531_attribute_group = {
65 .attrs = tsl4531_attributes,
66};
67
68static 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
77static 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
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
112static 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
143static const struct iio_info tsl4531_info = {
144 .read_raw = tsl4531_read_raw,
145 .write_raw = tsl4531_write_raw,
146 .attrs = &tsl4531_attribute_group,
147};
148
149static int tsl4531_check_id(struct i2c_client *client)
150{
151 int ret = i2c_smbus_read_byte_data(client, TSL4531_ID);
152 if (ret < 0)
153 return ret;
154
155 switch (ret >> TSL4531_ID_SHIFT) {
156 case TSL45311_ID:
157 case TSL45313_ID:
158 case TSL45315_ID:
159 case TSL45317_ID:
160 return 0;
161 default:
162 return -ENODEV;
163 }
164}
165
166static int tsl4531_probe(struct i2c_client *client,
167 const struct i2c_device_id *id)
168{
169 struct tsl4531_data *data;
170 struct iio_dev *indio_dev;
171 int ret;
172
173 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
174 if (!indio_dev)
175 return -ENOMEM;
176
177 data = iio_priv(indio_dev);
178 i2c_set_clientdata(client, indio_dev);
179 data->client = client;
180 mutex_init(&data->lock);
181
182 ret = tsl4531_check_id(client);
183 if (ret) {
184 dev_err(&client->dev, "no TSL4531 sensor\n");
185 return ret;
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
208static int tsl4531_powerdown(struct i2c_client *client)
209{
210 return i2c_smbus_write_byte_data(client, TSL4531_CONTROL,
211 TSL4531_MODE_POWERDOWN);
212}
213
214static 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
223static int tsl4531_suspend(struct device *dev)
224{
225 return tsl4531_powerdown(to_i2c_client(dev));
226}
227
228static 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}
233
234static SIMPLE_DEV_PM_OPS(tsl4531_pm_ops, tsl4531_suspend, tsl4531_resume);
235#define TSL4531_PM_OPS (&tsl4531_pm_ops)
236#else
237#define TSL4531_PM_OPS NULL
238#endif
239
240static const struct i2c_device_id tsl4531_id[] = {
241 { "tsl4531", 0 },
242 { }
243};
244MODULE_DEVICE_TABLE(i2c, tsl4531_id);
245
246static struct i2c_driver tsl4531_driver = {
247 .driver = {
248 .name = TSL4531_DRV_NAME,
249 .pm = TSL4531_PM_OPS,
250 },
251 .probe = tsl4531_probe,
252 .remove = tsl4531_remove,
253 .id_table = tsl4531_id,
254};
255
256module_i2c_driver(tsl4531_driver);
257
258MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
259MODULE_DESCRIPTION("TAOS TSL4531 ambient light sensors driver");
260MODULE_LICENSE("GPL");
261
