tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * isl29125.c - Support for Intersil ISL29125 RGB light sensor
3 *
4 * Copyright (c) 2014 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 * RGB light sensor with 16-bit channels for red, green, blue);
11 * 7-bit I2C slave address 0x44
12 *
13 * TODO: interrupt support, IR compensation, thresholds, 12bit
14 */
15
16#include <linux/module.h>
17#include <linux/i2c.h>
18#include <linux/delay.h>
19#include <linux/pm.h>
20
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>
26
27#define ISL29125_DRV_NAME "isl29125"
28
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
37
38#define ISL29125_ID 0x7d
39
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
46
47#define ISL29125_SENSING_RANGE_0 5722 /* 375 lux full range */
48#define ISL29125_SENSING_RANGE_1 152590 /* 10k lux full range */
49
50#define ISL29125_MODE_RANGE BIT(3)
51
52#define ISL29125_STATUS_CONV BIT(1)
53
54struct isl29125_data {
55 struct i2c_client *client;
56 u8 conf1;
57 u16 buffer[8]; /* 3x 16-bit, padding, 8 bytes timestamp */
58};
59
60#define ISL29125_CHANNEL(_color, _si) { \
61 .type = IIO_INTENSITY, \
62 .modified = 1, \
63 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
64 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
65 .channel2 = IIO_MOD_LIGHT_##_color, \
66 .scan_index = _si, \
67 .scan_type = { \
68 .sign = 'u', \
69 .realbits = 16, \
70 .storagebits = 16, \
71 .endianness = IIO_CPU, \
72 }, \
73}
74
75static const struct iio_chan_spec isl29125_channels[] = {
76 ISL29125_CHANNEL(GREEN, 0),
77 ISL29125_CHANNEL(RED, 1),
78 ISL29125_CHANNEL(BLUE, 2),
79 IIO_CHAN_SOFT_TIMESTAMP(3),
80};
81
82static const struct {
83 u8 mode, data;
84} isl29125_regs[] = {
85 {ISL29125_MODE_G, ISL29125_GREEN_DATA},
86 {ISL29125_MODE_R, ISL29125_RED_DATA},
87 {ISL29125_MODE_B, ISL29125_BLUE_DATA},
88};
89
90static int isl29125_read_data(struct isl29125_data *data, int si)
91{
92 int tries = 5;
93 int ret;
94
95 ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
96 data->conf1 | isl29125_regs[si].mode);
97 if (ret < 0)
98 return ret;
99
100 msleep(101);
101
102 while (tries--) {
103 ret = i2c_smbus_read_byte_data(data->client, ISL29125_STATUS);
104 if (ret < 0)
105 goto fail;
106 if (ret & ISL29125_STATUS_CONV)
107 break;
108 msleep(20);
109 }
110
111 if (tries < 0) {
112 dev_err(&data->client->dev, "data not ready\n");
113 ret = -EIO;
114 goto fail;
115 }
116
117 ret = i2c_smbus_read_word_data(data->client, isl29125_regs[si].data);
118
119fail:
120 i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, data->conf1);
121 return ret;
122}
123
124static int isl29125_read_raw(struct iio_dev *indio_dev,
125 struct iio_chan_spec const *chan,
126 int *val, int *val2, long mask)
127{
128 struct isl29125_data *data = iio_priv(indio_dev);
129 int ret;
130
131 switch (mask) {
132 case IIO_CHAN_INFO_RAW:
133 ret = iio_device_claim_direct_mode(indio_dev);
134 if (ret)
135 return ret;
136 ret = isl29125_read_data(data, chan->scan_index);
137 iio_device_release_direct_mode(indio_dev);
138 if (ret < 0)
139 return ret;
140 *val = ret;
141 return IIO_VAL_INT;
142 case IIO_CHAN_INFO_SCALE:
143 *val = 0;
144 if (data->conf1 & ISL29125_MODE_RANGE)
145 *val2 = ISL29125_SENSING_RANGE_1; /*10k lux full range*/
146 else
147 *val2 = ISL29125_SENSING_RANGE_0; /*375 lux full range*/
148 return IIO_VAL_INT_PLUS_MICRO;
149 }
150 return -EINVAL;
151}
152
153static int isl29125_write_raw(struct iio_dev *indio_dev,
154 struct iio_chan_spec const *chan,
155 int val, int val2, long mask)
156{
157 struct isl29125_data *data = iio_priv(indio_dev);
158
159 switch (mask) {
160 case IIO_CHAN_INFO_SCALE:
161 if (val != 0)
162 return -EINVAL;
163 if (val2 == ISL29125_SENSING_RANGE_1)
164 data->conf1 |= ISL29125_MODE_RANGE;
165 else if (val2 == ISL29125_SENSING_RANGE_0)
166 data->conf1 &= ~ISL29125_MODE_RANGE;
167 else
168 return -EINVAL;
169 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
170 data->conf1);
171 default:
172 return -EINVAL;
173 }
174}
175
176static irqreturn_t isl29125_trigger_handler(int irq, void *p)
177{
178 struct iio_poll_func *pf = p;
179 struct iio_dev *indio_dev = pf->indio_dev;
180 struct isl29125_data *data = iio_priv(indio_dev);
181 int i, j = 0;
182
183 for_each_set_bit(i, indio_dev->active_scan_mask,
184 indio_dev->masklength) {
185 int ret = i2c_smbus_read_word_data(data->client,
186 isl29125_regs[i].data);
187 if (ret < 0)
188 goto done;
189
190 data->buffer[j++] = ret;
191 }
192
193 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
194 iio_get_time_ns(indio_dev));
195
196done:
197 iio_trigger_notify_done(indio_dev->trig);
198
199 return IRQ_HANDLED;
200}
201
202static IIO_CONST_ATTR(scale_available, "0.005722 0.152590");
203
204static struct attribute *isl29125_attributes[] = {
205 &iio_const_attr_scale_available.dev_attr.attr,
206 NULL
207};
208
209static const struct attribute_group isl29125_attribute_group = {
210 .attrs = isl29125_attributes,
211};
212
213static const struct iio_info isl29125_info = {
214 .read_raw = isl29125_read_raw,
215 .write_raw = isl29125_write_raw,
216 .attrs = &isl29125_attribute_group,
217};
218
219static int isl29125_buffer_preenable(struct iio_dev *indio_dev)
220{
221 struct isl29125_data *data = iio_priv(indio_dev);
222
223 data->conf1 |= ISL29125_MODE_RGB;
224 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
225 data->conf1);
226}
227
228static int isl29125_buffer_predisable(struct iio_dev *indio_dev)
229{
230 struct isl29125_data *data = iio_priv(indio_dev);
231 int ret;
232
233 ret = iio_triggered_buffer_predisable(indio_dev);
234 if (ret < 0)
235 return ret;
236
237 data->conf1 &= ~ISL29125_MODE_MASK;
238 data->conf1 |= ISL29125_MODE_PD;
239 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
240 data->conf1);
241}
242
243static const struct iio_buffer_setup_ops isl29125_buffer_setup_ops = {
244 .preenable = isl29125_buffer_preenable,
245 .postenable = &iio_triggered_buffer_postenable,
246 .predisable = isl29125_buffer_predisable,
247};
248
249static int isl29125_probe(struct i2c_client *client,
250 const struct i2c_device_id *id)
251{
252 struct isl29125_data *data;
253 struct iio_dev *indio_dev;
254 int ret;
255
256 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
257 if (indio_dev == NULL)
258 return -ENOMEM;
259
260 data = iio_priv(indio_dev);
261 i2c_set_clientdata(client, indio_dev);
262 data->client = client;
263
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;
270
271 ret = i2c_smbus_read_byte_data(data->client, ISL29125_DEVICE_ID);
272 if (ret < 0)
273 return ret;
274 if (ret != ISL29125_ID)
275 return -ENODEV;
276
277 data->conf1 = ISL29125_MODE_PD | ISL29125_MODE_RANGE;
278 ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
279 data->conf1);
280 if (ret < 0)
281 return ret;
282
283 ret = i2c_smbus_write_byte_data(data->client, ISL29125_STATUS, 0);
284 if (ret < 0)
285 return ret;
286
287 ret = iio_triggered_buffer_setup(indio_dev, NULL,
288 isl29125_trigger_handler, &isl29125_buffer_setup_ops);
289 if (ret < 0)
290 return ret;
291
292 ret = iio_device_register(indio_dev);
293 if (ret < 0)
294 goto buffer_cleanup;
295
296 return 0;
297
298buffer_cleanup:
299 iio_triggered_buffer_cleanup(indio_dev);
300 return ret;
301}
302
303static int isl29125_powerdown(struct isl29125_data *data)
304{
305 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
306 (data->conf1 & ~ISL29125_MODE_MASK) | ISL29125_MODE_PD);
307}
308
309static int isl29125_remove(struct i2c_client *client)
310{
311 struct iio_dev *indio_dev = i2c_get_clientdata(client);
312
313 iio_device_unregister(indio_dev);
314 iio_triggered_buffer_cleanup(indio_dev);
315 isl29125_powerdown(iio_priv(indio_dev));
316
317 return 0;
318}
319
320#ifdef CONFIG_PM_SLEEP
321static int isl29125_suspend(struct device *dev)
322{
323 struct isl29125_data *data = iio_priv(i2c_get_clientdata(
324 to_i2c_client(dev)));
325 return isl29125_powerdown(data);
326}
327
328static int isl29125_resume(struct device *dev)
329{
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,
333 data->conf1);
334}
335#endif
336
337static SIMPLE_DEV_PM_OPS(isl29125_pm_ops, isl29125_suspend, isl29125_resume);
338
339static const struct i2c_device_id isl29125_id[] = {
340 { "isl29125", 0 },
341 { }
342};
343MODULE_DEVICE_TABLE(i2c, isl29125_id);
344
345static struct i2c_driver isl29125_driver = {
346 .driver = {
347 .name = ISL29125_DRV_NAME,
348 .pm = &isl29125_pm_ops,
349 },
350 .probe = isl29125_probe,
351 .remove = isl29125_remove,
352 .id_table = isl29125_id,
353};
354module_i2c_driver(isl29125_driver);
355
356MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
357MODULE_DESCRIPTION("ISL29125 RGB light sensor driver");
358MODULE_LICENSE("GPL");