2 * isl29125.c - Support for Intersil ISL29125 RGB light sensor
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.
10 * RGB light sensor with 16-bit channels for red, green, blue);
11 * 7-bit I2C slave address 0x44
13 * TODO: interrupt support, IR compensation, thresholds, 12bit
16 #include <linux/module.h>
17 #include <linux/i2c.h>
18 #include <linux/delay.h>
21 #include <linux/iio/iio.h>
22 #include <linux/iio/sysfs.h>
23 #include <linux/iio/trigger_consumer.h>
24 #include <linux/iio/buffer.h>
25 #include <linux/iio/triggered_buffer.h>
27 #define ISL29125_DRV_NAME "isl29125"
29 #define ISL29125_DEVICE_ID 0x00
30 #define ISL29125_CONF1 0x01
31 #define ISL29125_CONF2 0x02
32 #define ISL29125_CONF3 0x03
33 #define ISL29125_STATUS 0x08
34 #define ISL29125_GREEN_DATA 0x09
35 #define ISL29125_RED_DATA 0x0b
36 #define ISL29125_BLUE_DATA 0x0d
38 #define ISL29125_ID 0x7d
40 #define ISL29125_MODE_MASK GENMASK(2, 0)
41 #define ISL29125_MODE_PD 0x0
42 #define ISL29125_MODE_G 0x1
43 #define ISL29125_MODE_R 0x2
44 #define ISL29125_MODE_B 0x3
45 #define ISL29125_MODE_RGB 0x5
47 #define ISL29125_MODE_RANGE BIT(3)
49 #define ISL29125_STATUS_CONV BIT(1)
51 struct isl29125_data {
52 struct i2c_client *client;
55 u16 buffer[8]; /* 3x 16-bit, padding, 8 bytes timestamp */
58 #define ISL29125_CHANNEL(_color, _si) { \
59 .type = IIO_INTENSITY, \
61 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
62 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
63 .channel2 = IIO_MOD_LIGHT_##_color, \
69 .endianness = IIO_CPU, \
73 static const struct iio_chan_spec isl29125_channels[] = {
74 ISL29125_CHANNEL(GREEN, 0),
75 ISL29125_CHANNEL(RED, 1),
76 ISL29125_CHANNEL(BLUE, 2),
77 IIO_CHAN_SOFT_TIMESTAMP(3),
83 {ISL29125_MODE_G, ISL29125_GREEN_DATA},
84 {ISL29125_MODE_R, ISL29125_RED_DATA},
85 {ISL29125_MODE_B, ISL29125_BLUE_DATA},
88 static int isl29125_read_data(struct isl29125_data *data, int si)
93 ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
94 data->conf1 | isl29125_regs[si].mode);
101 ret = i2c_smbus_read_byte_data(data->client, ISL29125_STATUS);
104 if (ret & ISL29125_STATUS_CONV)
110 dev_err(&data->client->dev, "data not ready\n");
115 ret = i2c_smbus_read_word_data(data->client, isl29125_regs[si].data);
118 i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, data->conf1);
122 static int isl29125_read_raw(struct iio_dev *indio_dev,
123 struct iio_chan_spec const *chan,
124 int *val, int *val2, long mask)
126 struct isl29125_data *data = iio_priv(indio_dev);
130 case IIO_CHAN_INFO_RAW:
131 if (iio_buffer_enabled(indio_dev))
133 mutex_lock(&data->lock);
134 ret = isl29125_read_data(data, chan->scan_index);
135 mutex_unlock(&data->lock);
140 case IIO_CHAN_INFO_SCALE:
142 if (data->conf1 & ISL29125_MODE_RANGE)
143 *val2 = 152590; /* 10k lux full range */
145 *val2 = 5722; /* 375 lux full range */
146 return IIO_VAL_INT_PLUS_MICRO;
151 static int isl29125_write_raw(struct iio_dev *indio_dev,
152 struct iio_chan_spec const *chan,
153 int val, int val2, long mask)
155 struct isl29125_data *data = iio_priv(indio_dev);
158 case IIO_CHAN_INFO_SCALE:
162 data->conf1 |= ISL29125_MODE_RANGE;
163 else if (val2 == 5722)
164 data->conf1 &= ~ISL29125_MODE_RANGE;
167 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
174 static irqreturn_t isl29125_trigger_handler(int irq, void *p)
176 struct iio_poll_func *pf = p;
177 struct iio_dev *indio_dev = pf->indio_dev;
178 struct isl29125_data *data = iio_priv(indio_dev);
181 for_each_set_bit(i, indio_dev->active_scan_mask,
182 indio_dev->masklength) {
183 int ret = i2c_smbus_read_word_data(data->client,
184 isl29125_regs[i].data);
188 data->buffer[j++] = ret;
191 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
195 iio_trigger_notify_done(indio_dev->trig);
200 static IIO_CONST_ATTR(scale_available, "0.005722 0.152590");
202 static struct attribute *isl29125_attributes[] = {
203 &iio_const_attr_scale_available.dev_attr.attr,
207 static const struct attribute_group isl29125_attribute_group = {
208 .attrs = isl29125_attributes,
211 static const struct iio_info isl29125_info = {
212 .read_raw = isl29125_read_raw,
213 .write_raw = isl29125_write_raw,
214 .attrs = &isl29125_attribute_group,
215 .driver_module = THIS_MODULE,
218 static int isl29125_buffer_preenable(struct iio_dev *indio_dev)
220 struct isl29125_data *data = iio_priv(indio_dev);
222 data->conf1 |= ISL29125_MODE_RGB;
223 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
227 static int isl29125_buffer_predisable(struct iio_dev *indio_dev)
229 struct isl29125_data *data = iio_priv(indio_dev);
232 ret = iio_triggered_buffer_predisable(indio_dev);
236 data->conf1 &= ~ISL29125_MODE_MASK;
237 data->conf1 |= ISL29125_MODE_PD;
238 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
242 static const struct iio_buffer_setup_ops isl29125_buffer_setup_ops = {
243 .preenable = isl29125_buffer_preenable,
244 .postenable = &iio_triggered_buffer_postenable,
245 .predisable = isl29125_buffer_predisable,
248 static int isl29125_probe(struct i2c_client *client,
249 const struct i2c_device_id *id)
251 struct isl29125_data *data;
252 struct iio_dev *indio_dev;
255 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
256 if (indio_dev == NULL)
259 data = iio_priv(indio_dev);
260 i2c_set_clientdata(client, indio_dev);
261 data->client = client;
262 mutex_init(&data->lock);
264 indio_dev->dev.parent = &client->dev;
265 indio_dev->info = &isl29125_info;
266 indio_dev->name = ISL29125_DRV_NAME;
267 indio_dev->channels = isl29125_channels;
268 indio_dev->num_channels = ARRAY_SIZE(isl29125_channels);
269 indio_dev->modes = INDIO_DIRECT_MODE;
271 ret = i2c_smbus_read_byte_data(data->client, ISL29125_DEVICE_ID);
274 if (ret != ISL29125_ID)
277 data->conf1 = ISL29125_MODE_PD | ISL29125_MODE_RANGE;
278 ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
283 ret = i2c_smbus_write_byte_data(data->client, ISL29125_STATUS, 0);
287 ret = iio_triggered_buffer_setup(indio_dev, NULL,
288 isl29125_trigger_handler, &isl29125_buffer_setup_ops);
292 ret = iio_device_register(indio_dev);
299 iio_triggered_buffer_cleanup(indio_dev);
303 static int isl29125_powerdown(struct isl29125_data *data)
305 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
306 (data->conf1 & ~ISL29125_MODE_MASK) | ISL29125_MODE_PD);
309 static int isl29125_remove(struct i2c_client *client)
311 struct iio_dev *indio_dev = i2c_get_clientdata(client);
313 iio_device_unregister(indio_dev);
314 iio_triggered_buffer_cleanup(indio_dev);
315 isl29125_powerdown(iio_priv(indio_dev));
320 #ifdef CONFIG_PM_SLEEP
321 static int isl29125_suspend(struct device *dev)
323 struct isl29125_data *data = iio_priv(i2c_get_clientdata(
324 to_i2c_client(dev)));
325 return isl29125_powerdown(data);
328 static int isl29125_resume(struct device *dev)
330 struct isl29125_data *data = iio_priv(i2c_get_clientdata(
331 to_i2c_client(dev)));
332 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
337 static SIMPLE_DEV_PM_OPS(isl29125_pm_ops, isl29125_suspend, isl29125_resume);
339 static const struct i2c_device_id isl29125_id[] = {
343 MODULE_DEVICE_TABLE(i2c, isl29125_id);
345 static struct i2c_driver isl29125_driver = {
347 .name = ISL29125_DRV_NAME,
348 .pm = &isl29125_pm_ops,
350 .probe = isl29125_probe,
351 .remove = isl29125_remove,
352 .id_table = isl29125_id,
354 module_i2c_driver(isl29125_driver);
357 MODULE_DESCRIPTION("ISL29125 RGB light sensor driver");
358 MODULE_LICENSE("GPL");