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_MODE_RANGE BIT(3)
48
49#define ISL29125_STATUS_CONV BIT(1)
50
51struct isl29125_data {
52 struct i2c_client *client;
53 struct mutex lock;
54 u8 conf1;
55 u16 buffer[8]; /* 3x 16-bit, padding, 8 bytes timestamp */
56};
57
58#define ISL29125_CHANNEL(_color, _si) { \
59 .type = IIO_INTENSITY, \
60 .modified = 1, \
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, \
64 .scan_index = _si, \
65 .scan_type = { \
66 .sign = 'u', \
67 .realbits = 16, \
68 .storagebits = 16, \
69 .endianness = IIO_CPU, \
70 }, \
71}
72
73static 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),
78};
79
80static const struct {
81 u8 mode, data;
82} isl29125_regs[] = {
83 {ISL29125_MODE_G, ISL29125_GREEN_DATA},
84 {ISL29125_MODE_R, ISL29125_RED_DATA},
85 {ISL29125_MODE_B, ISL29125_BLUE_DATA},
86};
87
88static int isl29125_read_data(struct isl29125_data *data, int si)
89{
90 int tries = 5;
91 int ret;
92
93 ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
94 data->conf1 | isl29125_regs[si].mode);
95 if (ret < 0)
96 return ret;
97
98 msleep(101);
99
100 while (tries--) {
101 ret = i2c_smbus_read_byte_data(data->client, ISL29125_STATUS);
102 if (ret < 0)
103 goto fail;
104 if (ret & ISL29125_STATUS_CONV)
105 break;
106 msleep(20);
107 }
108
109 if (tries < 0) {
110 dev_err(&data->client->dev, "data not ready\n");
111 ret = -EIO;
112 goto fail;
113 }
114
115 ret = i2c_smbus_read_word_data(data->client, isl29125_regs[si].data);
116
117fail:
118 i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, data->conf1);
119 return ret;
120}
121
122static int isl29125_read_raw(struct iio_dev *indio_dev,
123 struct iio_chan_spec const *chan,
124 int *val, int *val2, long mask)
125{
126 struct isl29125_data *data = iio_priv(indio_dev);
127 int ret;
128
129 switch (mask) {
130 case IIO_CHAN_INFO_RAW:
131 if (iio_buffer_enabled(indio_dev))
132 return -EBUSY;
133 mutex_lock(&data->lock);
134 ret = isl29125_read_data(data, chan->scan_index);
135 mutex_unlock(&data->lock);
136 if (ret < 0)
137 return ret;
138 *val = ret;
139 return IIO_VAL_INT;
140 case IIO_CHAN_INFO_SCALE:
141 *val = 0;
142 if (data->conf1 & ISL29125_MODE_RANGE)
143 *val2 = 152590; /* 10k lux full range */
144 else
145 *val2 = 5722; /* 375 lux full range */
146 return IIO_VAL_INT_PLUS_MICRO;
147 }
148 return -EINVAL;
149}
150
151static int isl29125_write_raw(struct iio_dev *indio_dev,
152 struct iio_chan_spec const *chan,
153 int val, int val2, long mask)
154{
155 struct isl29125_data *data = iio_priv(indio_dev);
156
157 switch (mask) {
158 case IIO_CHAN_INFO_SCALE:
159 if (val != 0)
160 return -EINVAL;
161 if (val2 == 152590)
162 data->conf1 |= ISL29125_MODE_RANGE;
163 else if (val2 == 5722)
164 data->conf1 &= ~ISL29125_MODE_RANGE;
165 else
166 return -EINVAL;
167 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
168 data->conf1);
169 default:
170 return -EINVAL;
171 }
172}
173
174static irqreturn_t isl29125_trigger_handler(int irq, void *p)
175{
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);
179 int i, j = 0;
180
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);
185 if (ret < 0)
186 goto done;
187
188 data->buffer[j++] = ret;
189 }
190
191 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
192 iio_get_time_ns());
193
194done:
195 iio_trigger_notify_done(indio_dev->trig);
196
197 return IRQ_HANDLED;
198}
199
200static IIO_CONST_ATTR(scale_available, "0.005722 0.152590");
201
202static struct attribute *isl29125_attributes[] = {
203 &iio_const_attr_scale_available.dev_attr.attr,
204 NULL
205};
206
207static const struct attribute_group isl29125_attribute_group = {
208 .attrs = isl29125_attributes,
209};
210
211static 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,
216};
217
218static int isl29125_buffer_preenable(struct iio_dev *indio_dev)
219{
220 struct isl29125_data *data = iio_priv(indio_dev);
221
222 data->conf1 |= ISL29125_MODE_RGB;
223 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
224 data->conf1);
225}
226
227static int isl29125_buffer_predisable(struct iio_dev *indio_dev)
228{
229 struct isl29125_data *data = iio_priv(indio_dev);
230 int ret;
231
232 ret = iio_triggered_buffer_predisable(indio_dev);
233 if (ret < 0)
234 return ret;
235
236 data->conf1 &= ~ISL29125_MODE_MASK;
237 data->conf1 |= ISL29125_MODE_PD;
238 return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
239 data->conf1);
240}
241
242static 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,
246};
247
248static int isl29125_probe(struct i2c_client *client,
249 const struct i2c_device_id *id)
250{
251 struct isl29125_data *data;
252 struct iio_dev *indio_dev;
253 int ret;
254
255 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
256 if (indio_dev == NULL)
257 return -ENOMEM;
258
259 data = iio_priv(indio_dev);
260 i2c_set_clientdata(client, indio_dev);
261 data->client = client;
262 mutex_init(&data->lock);
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");