inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / iio / light / tcs3414.c
bloba795afb7667bdeb7ec23987a64aaa897a88ed890
1 /*
2 * tcs3414.c - Support for TAOS TCS3414 digital color sensor
4 * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
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 * Digital color sensor with 16-bit channels for red, green, blue, clear);
11 * 7-bit I2C slave address 0x39 (TCS3414) or 0x29, 0x49, 0x59 (TCS3413,
12 * TCS3415, TCS3416, resp.)
14 * TODO: sync, interrupt support, thresholds, prescaler
17 #include <linux/module.h>
18 #include <linux/i2c.h>
19 #include <linux/delay.h>
20 #include <linux/pm.h>
22 #include <linux/iio/iio.h>
23 #include <linux/iio/sysfs.h>
24 #include <linux/iio/trigger_consumer.h>
25 #include <linux/iio/buffer.h>
26 #include <linux/iio/triggered_buffer.h>
28 #define TCS3414_DRV_NAME "tcs3414"
30 #define TCS3414_COMMAND BIT(7)
31 #define TCS3414_COMMAND_WORD (TCS3414_COMMAND | BIT(5))
33 #define TCS3414_CONTROL (TCS3414_COMMAND | 0x00)
34 #define TCS3414_TIMING (TCS3414_COMMAND | 0x01)
35 #define TCS3414_ID (TCS3414_COMMAND | 0x04)
36 #define TCS3414_GAIN (TCS3414_COMMAND | 0x07)
37 #define TCS3414_DATA_GREEN (TCS3414_COMMAND_WORD | 0x10)
38 #define TCS3414_DATA_RED (TCS3414_COMMAND_WORD | 0x12)
39 #define TCS3414_DATA_BLUE (TCS3414_COMMAND_WORD | 0x14)
40 #define TCS3414_DATA_CLEAR (TCS3414_COMMAND_WORD | 0x16)
42 #define TCS3414_CONTROL_ADC_VALID BIT(4)
43 #define TCS3414_CONTROL_ADC_EN BIT(1)
44 #define TCS3414_CONTROL_POWER BIT(0)
46 #define TCS3414_INTEG_MASK GENMASK(1, 0)
47 #define TCS3414_INTEG_12MS 0x0
48 #define TCS3414_INTEG_100MS 0x1
49 #define TCS3414_INTEG_400MS 0x2
51 #define TCS3414_GAIN_MASK GENMASK(5, 4)
52 #define TCS3414_GAIN_SHIFT 4
54 struct tcs3414_data {
55 struct i2c_client *client;
56 u8 control;
57 u8 gain;
58 u8 timing;
59 u16 buffer[8]; /* 4x 16-bit + 8 bytes timestamp */
62 #define TCS3414_CHANNEL(_color, _si, _addr) { \
63 .type = IIO_INTENSITY, \
64 .modified = 1, \
65 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
66 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
67 BIT(IIO_CHAN_INFO_INT_TIME), \
68 .channel2 = IIO_MOD_LIGHT_##_color, \
69 .address = _addr, \
70 .scan_index = _si, \
71 .scan_type = { \
72 .sign = 'u', \
73 .realbits = 16, \
74 .storagebits = 16, \
75 .endianness = IIO_CPU, \
76 }, \
79 /* scale factors: 1/gain */
80 static const int tcs3414_scales[][2] = {
81 {1, 0}, {0, 250000}, {0, 62500}, {0, 15625}
84 /* integration time in ms */
85 static const int tcs3414_times[] = { 12, 100, 400 };
87 static const struct iio_chan_spec tcs3414_channels[] = {
88 TCS3414_CHANNEL(GREEN, 0, TCS3414_DATA_GREEN),
89 TCS3414_CHANNEL(RED, 1, TCS3414_DATA_RED),
90 TCS3414_CHANNEL(BLUE, 2, TCS3414_DATA_BLUE),
91 TCS3414_CHANNEL(CLEAR, 3, TCS3414_DATA_CLEAR),
92 IIO_CHAN_SOFT_TIMESTAMP(4),
95 static int tcs3414_req_data(struct tcs3414_data *data)
97 int tries = 25;
98 int ret;
100 ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
101 data->control | TCS3414_CONTROL_ADC_EN);
102 if (ret < 0)
103 return ret;
105 while (tries--) {
106 ret = i2c_smbus_read_byte_data(data->client, TCS3414_CONTROL);
107 if (ret < 0)
108 return ret;
109 if (ret & TCS3414_CONTROL_ADC_VALID)
110 break;
111 msleep(20);
114 ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
115 data->control);
116 if (ret < 0)
117 return ret;
119 if (tries < 0) {
120 dev_err(&data->client->dev, "data not ready\n");
121 return -EIO;
124 return 0;
127 static int tcs3414_read_raw(struct iio_dev *indio_dev,
128 struct iio_chan_spec const *chan,
129 int *val, int *val2, long mask)
131 struct tcs3414_data *data = iio_priv(indio_dev);
132 int i, ret;
134 switch (mask) {
135 case IIO_CHAN_INFO_RAW:
136 ret = iio_device_claim_direct_mode(indio_dev);
137 if (ret)
138 return ret;
139 ret = tcs3414_req_data(data);
140 if (ret < 0) {
141 iio_device_release_direct_mode(indio_dev);
142 return ret;
144 ret = i2c_smbus_read_word_data(data->client, chan->address);
145 iio_device_release_direct_mode(indio_dev);
146 if (ret < 0)
147 return ret;
148 *val = ret;
149 return IIO_VAL_INT;
150 case IIO_CHAN_INFO_SCALE:
151 i = (data->gain & TCS3414_GAIN_MASK) >> TCS3414_GAIN_SHIFT;
152 *val = tcs3414_scales[i][0];
153 *val2 = tcs3414_scales[i][1];
154 return IIO_VAL_INT_PLUS_MICRO;
155 case IIO_CHAN_INFO_INT_TIME:
156 *val = 0;
157 *val2 = tcs3414_times[data->timing & TCS3414_INTEG_MASK] * 1000;
158 return IIO_VAL_INT_PLUS_MICRO;
160 return -EINVAL;
163 static int tcs3414_write_raw(struct iio_dev *indio_dev,
164 struct iio_chan_spec const *chan,
165 int val, int val2, long mask)
167 struct tcs3414_data *data = iio_priv(indio_dev);
168 int i;
170 switch (mask) {
171 case IIO_CHAN_INFO_SCALE:
172 for (i = 0; i < ARRAY_SIZE(tcs3414_scales); i++) {
173 if (val == tcs3414_scales[i][0] &&
174 val2 == tcs3414_scales[i][1]) {
175 data->gain &= ~TCS3414_GAIN_MASK;
176 data->gain |= i << TCS3414_GAIN_SHIFT;
177 return i2c_smbus_write_byte_data(
178 data->client, TCS3414_GAIN,
179 data->gain);
182 return -EINVAL;
183 case IIO_CHAN_INFO_INT_TIME:
184 if (val != 0)
185 return -EINVAL;
186 for (i = 0; i < ARRAY_SIZE(tcs3414_times); i++) {
187 if (val2 == tcs3414_times[i] * 1000) {
188 data->timing &= ~TCS3414_INTEG_MASK;
189 data->timing |= i;
190 return i2c_smbus_write_byte_data(
191 data->client, TCS3414_TIMING,
192 data->timing);
195 return -EINVAL;
196 default:
197 return -EINVAL;
201 static irqreturn_t tcs3414_trigger_handler(int irq, void *p)
203 struct iio_poll_func *pf = p;
204 struct iio_dev *indio_dev = pf->indio_dev;
205 struct tcs3414_data *data = iio_priv(indio_dev);
206 int i, j = 0;
208 for_each_set_bit(i, indio_dev->active_scan_mask,
209 indio_dev->masklength) {
210 int ret = i2c_smbus_read_word_data(data->client,
211 TCS3414_DATA_GREEN + 2*i);
212 if (ret < 0)
213 goto done;
215 data->buffer[j++] = ret;
218 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
219 iio_get_time_ns(indio_dev));
221 done:
222 iio_trigger_notify_done(indio_dev->trig);
224 return IRQ_HANDLED;
227 static IIO_CONST_ATTR(scale_available, "1 0.25 0.0625 0.015625");
228 static IIO_CONST_ATTR_INT_TIME_AVAIL("0.012 0.1 0.4");
230 static struct attribute *tcs3414_attributes[] = {
231 &iio_const_attr_scale_available.dev_attr.attr,
232 &iio_const_attr_integration_time_available.dev_attr.attr,
233 NULL
236 static const struct attribute_group tcs3414_attribute_group = {
237 .attrs = tcs3414_attributes,
240 static const struct iio_info tcs3414_info = {
241 .read_raw = tcs3414_read_raw,
242 .write_raw = tcs3414_write_raw,
243 .attrs = &tcs3414_attribute_group,
244 .driver_module = THIS_MODULE,
247 static int tcs3414_buffer_preenable(struct iio_dev *indio_dev)
249 struct tcs3414_data *data = iio_priv(indio_dev);
251 data->control |= TCS3414_CONTROL_ADC_EN;
252 return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
253 data->control);
256 static int tcs3414_buffer_predisable(struct iio_dev *indio_dev)
258 struct tcs3414_data *data = iio_priv(indio_dev);
259 int ret;
261 ret = iio_triggered_buffer_predisable(indio_dev);
262 if (ret < 0)
263 return ret;
265 data->control &= ~TCS3414_CONTROL_ADC_EN;
266 return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
267 data->control);
270 static const struct iio_buffer_setup_ops tcs3414_buffer_setup_ops = {
271 .preenable = tcs3414_buffer_preenable,
272 .postenable = &iio_triggered_buffer_postenable,
273 .predisable = tcs3414_buffer_predisable,
276 static int tcs3414_probe(struct i2c_client *client,
277 const struct i2c_device_id *id)
279 struct tcs3414_data *data;
280 struct iio_dev *indio_dev;
281 int ret;
283 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
284 if (indio_dev == NULL)
285 return -ENOMEM;
287 data = iio_priv(indio_dev);
288 i2c_set_clientdata(client, indio_dev);
289 data->client = client;
291 indio_dev->dev.parent = &client->dev;
292 indio_dev->info = &tcs3414_info;
293 indio_dev->name = TCS3414_DRV_NAME;
294 indio_dev->channels = tcs3414_channels;
295 indio_dev->num_channels = ARRAY_SIZE(tcs3414_channels);
296 indio_dev->modes = INDIO_DIRECT_MODE;
298 ret = i2c_smbus_read_byte_data(data->client, TCS3414_ID);
299 if (ret < 0)
300 return ret;
302 switch (ret & 0xf0) {
303 case 0x00:
304 dev_info(&client->dev, "TCS3404 found\n");
305 break;
306 case 0x10:
307 dev_info(&client->dev, "TCS3413/14/15/16 found\n");
308 break;
309 default:
310 return -ENODEV;
313 data->control = TCS3414_CONTROL_POWER;
314 ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
315 data->control);
316 if (ret < 0)
317 return ret;
319 data->timing = TCS3414_INTEG_12MS; /* free running */
320 ret = i2c_smbus_write_byte_data(data->client, TCS3414_TIMING,
321 data->timing);
322 if (ret < 0)
323 return ret;
325 ret = i2c_smbus_read_byte_data(data->client, TCS3414_GAIN);
326 if (ret < 0)
327 return ret;
328 data->gain = ret;
330 ret = iio_triggered_buffer_setup(indio_dev, NULL,
331 tcs3414_trigger_handler, &tcs3414_buffer_setup_ops);
332 if (ret < 0)
333 return ret;
335 ret = iio_device_register(indio_dev);
336 if (ret < 0)
337 goto buffer_cleanup;
339 return 0;
341 buffer_cleanup:
342 iio_triggered_buffer_cleanup(indio_dev);
343 return ret;
346 static int tcs3414_powerdown(struct tcs3414_data *data)
348 return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
349 data->control & ~(TCS3414_CONTROL_POWER |
350 TCS3414_CONTROL_ADC_EN));
353 static int tcs3414_remove(struct i2c_client *client)
355 struct iio_dev *indio_dev = i2c_get_clientdata(client);
357 iio_device_unregister(indio_dev);
358 iio_triggered_buffer_cleanup(indio_dev);
359 tcs3414_powerdown(iio_priv(indio_dev));
361 return 0;
364 #ifdef CONFIG_PM_SLEEP
365 static int tcs3414_suspend(struct device *dev)
367 struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
368 to_i2c_client(dev)));
369 return tcs3414_powerdown(data);
372 static int tcs3414_resume(struct device *dev)
374 struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
375 to_i2c_client(dev)));
376 return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
377 data->control);
379 #endif
381 static SIMPLE_DEV_PM_OPS(tcs3414_pm_ops, tcs3414_suspend, tcs3414_resume);
383 static const struct i2c_device_id tcs3414_id[] = {
384 { "tcs3414", 0 },
387 MODULE_DEVICE_TABLE(i2c, tcs3414_id);
389 static struct i2c_driver tcs3414_driver = {
390 .driver = {
391 .name = TCS3414_DRV_NAME,
392 .pm = &tcs3414_pm_ops,
394 .probe = tcs3414_probe,
395 .remove = tcs3414_remove,
396 .id_table = tcs3414_id,
398 module_i2c_driver(tcs3414_driver);
400 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
401 MODULE_DESCRIPTION("TCS3414 digital color sensors driver");
402 MODULE_LICENSE("GPL");