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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * tcs3414.c - Support for TAOS TCS3414 digital color sensor
4 *
5 * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
6 *
7 * Digital color sensor with 16-bit channels for red, green, blue, clear);
8 * 7-bit I2C slave address 0x39 (TCS3414) or 0x29, 0x49, 0x59 (TCS3413,
9 * TCS3415, TCS3416, resp.)
10 *
11 * TODO: sync, interrupt support, thresholds, prescaler
12 */
13
14#include <linux/module.h>
15#include <linux/i2c.h>
16#include <linux/delay.h>
17#include <linux/pm.h>
18
19#include <linux/iio/iio.h>
20#include <linux/iio/sysfs.h>
21#include <linux/iio/trigger_consumer.h>
22#include <linux/iio/buffer.h>
23#include <linux/iio/triggered_buffer.h>
24
25#define TCS3414_DRV_NAME "tcs3414"
26
27#define TCS3414_COMMAND BIT(7)
28#define TCS3414_COMMAND_WORD (TCS3414_COMMAND | BIT(5))
29
30#define TCS3414_CONTROL (TCS3414_COMMAND | 0x00)
31#define TCS3414_TIMING (TCS3414_COMMAND | 0x01)
32#define TCS3414_ID (TCS3414_COMMAND | 0x04)
33#define TCS3414_GAIN (TCS3414_COMMAND | 0x07)
34#define TCS3414_DATA_GREEN (TCS3414_COMMAND_WORD | 0x10)
35#define TCS3414_DATA_RED (TCS3414_COMMAND_WORD | 0x12)
36#define TCS3414_DATA_BLUE (TCS3414_COMMAND_WORD | 0x14)
37#define TCS3414_DATA_CLEAR (TCS3414_COMMAND_WORD | 0x16)
38
39#define TCS3414_CONTROL_ADC_VALID BIT(4)
40#define TCS3414_CONTROL_ADC_EN BIT(1)
41#define TCS3414_CONTROL_POWER BIT(0)
42
43#define TCS3414_INTEG_MASK GENMASK(1, 0)
44#define TCS3414_INTEG_12MS 0x0
45#define TCS3414_INTEG_100MS 0x1
46#define TCS3414_INTEG_400MS 0x2
47
48#define TCS3414_GAIN_MASK GENMASK(5, 4)
49#define TCS3414_GAIN_SHIFT 4
50
51struct tcs3414_data {
52 struct i2c_client *client;
53 u8 control;
54 u8 gain;
55 u8 timing;
56 /* Ensure timestamp is naturally aligned */
57 struct {
58 u16 chans[4];
59 s64 timestamp __aligned(8);
60 } scan;
61};
62
63#define TCS3414_CHANNEL(_color, _si, _addr) { \
64 .type = IIO_INTENSITY, \
65 .modified = 1, \
66 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
67 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
68 BIT(IIO_CHAN_INFO_INT_TIME), \
69 .channel2 = IIO_MOD_LIGHT_##_color, \
70 .address = _addr, \
71 .scan_index = _si, \
72 .scan_type = { \
73 .sign = 'u', \
74 .realbits = 16, \
75 .storagebits = 16, \
76 .endianness = IIO_CPU, \
77 }, \
78}
79
80/* scale factors: 1/gain */
81static const int tcs3414_scales[][2] = {
82 {1, 0}, {0, 250000}, {0, 62500}, {0, 15625}
83};
84
85/* integration time in ms */
86static const int tcs3414_times[] = { 12, 100, 400 };
87
88static const struct iio_chan_spec tcs3414_channels[] = {
89 TCS3414_CHANNEL(GREEN, 0, TCS3414_DATA_GREEN),
90 TCS3414_CHANNEL(RED, 1, TCS3414_DATA_RED),
91 TCS3414_CHANNEL(BLUE, 2, TCS3414_DATA_BLUE),
92 TCS3414_CHANNEL(CLEAR, 3, TCS3414_DATA_CLEAR),
93 IIO_CHAN_SOFT_TIMESTAMP(4),
94};
95
96static int tcs3414_req_data(struct tcs3414_data *data)
97{
98 int tries = 25;
99 int ret;
100
101 ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
102 data->control | TCS3414_CONTROL_ADC_EN);
103 if (ret < 0)
104 return ret;
105
106 while (tries--) {
107 ret = i2c_smbus_read_byte_data(data->client, TCS3414_CONTROL);
108 if (ret < 0)
109 return ret;
110 if (ret & TCS3414_CONTROL_ADC_VALID)
111 break;
112 msleep(20);
113 }
114
115 ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
116 data->control);
117 if (ret < 0)
118 return ret;
119
120 if (tries < 0) {
121 dev_err(&data->client->dev, "data not ready\n");
122 return -EIO;
123 }
124
125 return 0;
126}
127
128static int tcs3414_read_raw(struct iio_dev *indio_dev,
129 struct iio_chan_spec const *chan,
130 int *val, int *val2, long mask)
131{
132 struct tcs3414_data *data = iio_priv(indio_dev);
133 int i, ret;
134
135 switch (mask) {
136 case IIO_CHAN_INFO_RAW:
137 ret = iio_device_claim_direct_mode(indio_dev);
138 if (ret)
139 return ret;
140 ret = tcs3414_req_data(data);
141 if (ret < 0) {
142 iio_device_release_direct_mode(indio_dev);
143 return ret;
144 }
145 ret = i2c_smbus_read_word_data(data->client, chan->address);
146 iio_device_release_direct_mode(indio_dev);
147 if (ret < 0)
148 return ret;
149 *val = ret;
150 return IIO_VAL_INT;
151 case IIO_CHAN_INFO_SCALE:
152 i = (data->gain & TCS3414_GAIN_MASK) >> TCS3414_GAIN_SHIFT;
153 *val = tcs3414_scales[i][0];
154 *val2 = tcs3414_scales[i][1];
155 return IIO_VAL_INT_PLUS_MICRO;
156 case IIO_CHAN_INFO_INT_TIME:
157 *val = 0;
158 *val2 = tcs3414_times[data->timing & TCS3414_INTEG_MASK] * 1000;
159 return IIO_VAL_INT_PLUS_MICRO;
160 }
161 return -EINVAL;
162}
163
164static int tcs3414_write_raw(struct iio_dev *indio_dev,
165 struct iio_chan_spec const *chan,
166 int val, int val2, long mask)
167{
168 struct tcs3414_data *data = iio_priv(indio_dev);
169 int i;
170
171 switch (mask) {
172 case IIO_CHAN_INFO_SCALE:
173 for (i = 0; i < ARRAY_SIZE(tcs3414_scales); i++) {
174 if (val == tcs3414_scales[i][0] &&
175 val2 == tcs3414_scales[i][1]) {
176 data->gain &= ~TCS3414_GAIN_MASK;
177 data->gain |= i << TCS3414_GAIN_SHIFT;
178 return i2c_smbus_write_byte_data(
179 data->client, TCS3414_GAIN,
180 data->gain);
181 }
182 }
183 return -EINVAL;
184 case IIO_CHAN_INFO_INT_TIME:
185 if (val != 0)
186 return -EINVAL;
187 for (i = 0; i < ARRAY_SIZE(tcs3414_times); i++) {
188 if (val2 == tcs3414_times[i] * 1000) {
189 data->timing &= ~TCS3414_INTEG_MASK;
190 data->timing |= i;
191 return i2c_smbus_write_byte_data(
192 data->client, TCS3414_TIMING,
193 data->timing);
194 }
195 }
196 return -EINVAL;
197 default:
198 return -EINVAL;
199 }
200}
201
202static irqreturn_t tcs3414_trigger_handler(int irq, void *p)
203{
204 struct iio_poll_func *pf = p;
205 struct iio_dev *indio_dev = pf->indio_dev;
206 struct tcs3414_data *data = iio_priv(indio_dev);
207 int i, j = 0;
208
209 iio_for_each_active_channel(indio_dev, i) {
210 int ret = i2c_smbus_read_word_data(data->client,
211 TCS3414_DATA_GREEN + 2*i);
212 if (ret < 0)
213 goto done;
214
215 data->scan.chans[j++] = ret;
216 }
217
218 iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
219 iio_get_time_ns(indio_dev));
220
221done:
222 iio_trigger_notify_done(indio_dev->trig);
223
224 return IRQ_HANDLED;
225}
226
227static IIO_CONST_ATTR(scale_available, "1 0.25 0.0625 0.015625");
228static IIO_CONST_ATTR_INT_TIME_AVAIL("0.012 0.1 0.4");
229
230static 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
234};
235
236static const struct attribute_group tcs3414_attribute_group = {
237 .attrs = tcs3414_attributes,
238};
239
240static const struct iio_info tcs3414_info = {
241 .read_raw = tcs3414_read_raw,
242 .write_raw = tcs3414_write_raw,
243 .attrs = &tcs3414_attribute_group,
244};
245
246static int tcs3414_buffer_postenable(struct iio_dev *indio_dev)
247{
248 struct tcs3414_data *data = iio_priv(indio_dev);
249
250 data->control |= TCS3414_CONTROL_ADC_EN;
251 return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
252 data->control);
253}
254
255static int tcs3414_buffer_predisable(struct iio_dev *indio_dev)
256{
257 struct tcs3414_data *data = iio_priv(indio_dev);
258
259 data->control &= ~TCS3414_CONTROL_ADC_EN;
260 return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
261 data->control);
262}
263
264static const struct iio_buffer_setup_ops tcs3414_buffer_setup_ops = {
265 .postenable = tcs3414_buffer_postenable,
266 .predisable = tcs3414_buffer_predisable,
267};
268
269static int tcs3414_powerdown(struct tcs3414_data *data)
270{
271 return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
272 data->control & ~(TCS3414_CONTROL_POWER |
273 TCS3414_CONTROL_ADC_EN));
274}
275
276static void tcs3414_powerdown_cleanup(void *data)
277{
278 tcs3414_powerdown(data);
279}
280
281static int tcs3414_probe(struct i2c_client *client)
282{
283 struct tcs3414_data *data;
284 struct iio_dev *indio_dev;
285 int ret;
286
287 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
288 if (indio_dev == NULL)
289 return -ENOMEM;
290
291 data = iio_priv(indio_dev);
292 i2c_set_clientdata(client, indio_dev);
293 data->client = client;
294
295 indio_dev->info = &tcs3414_info;
296 indio_dev->name = TCS3414_DRV_NAME;
297 indio_dev->channels = tcs3414_channels;
298 indio_dev->num_channels = ARRAY_SIZE(tcs3414_channels);
299 indio_dev->modes = INDIO_DIRECT_MODE;
300
301 ret = i2c_smbus_read_byte_data(data->client, TCS3414_ID);
302 if (ret < 0)
303 return ret;
304
305 switch (ret & 0xf0) {
306 case 0x00:
307 dev_info(&client->dev, "TCS3404 found\n");
308 break;
309 case 0x10:
310 dev_info(&client->dev, "TCS3413/14/15/16 found\n");
311 break;
312 default:
313 return -ENODEV;
314 }
315
316 data->control = TCS3414_CONTROL_POWER;
317 ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
318 data->control);
319 if (ret < 0)
320 return ret;
321
322 ret = devm_add_action_or_reset(&client->dev, tcs3414_powerdown_cleanup,
323 data);
324 if (ret < 0)
325 return ret;
326
327 data->timing = TCS3414_INTEG_12MS; /* free running */
328 ret = i2c_smbus_write_byte_data(data->client, TCS3414_TIMING,
329 data->timing);
330 if (ret < 0)
331 return ret;
332
333 ret = i2c_smbus_read_byte_data(data->client, TCS3414_GAIN);
334 if (ret < 0)
335 return ret;
336 data->gain = ret;
337
338 ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,
339 tcs3414_trigger_handler, &tcs3414_buffer_setup_ops);
340 if (ret < 0)
341 return ret;
342
343 return devm_iio_device_register(&client->dev, indio_dev);
344}
345
346static int tcs3414_suspend(struct device *dev)
347{
348 struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
349 to_i2c_client(dev)));
350 return tcs3414_powerdown(data);
351}
352
353static int tcs3414_resume(struct device *dev)
354{
355 struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
356 to_i2c_client(dev)));
357 return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
358 data->control);
359}
360
361static DEFINE_SIMPLE_DEV_PM_OPS(tcs3414_pm_ops, tcs3414_suspend,
362 tcs3414_resume);
363
364static const struct i2c_device_id tcs3414_id[] = {
365 { "tcs3414" },
366 { }
367};
368MODULE_DEVICE_TABLE(i2c, tcs3414_id);
369
370static struct i2c_driver tcs3414_driver = {
371 .driver = {
372 .name = TCS3414_DRV_NAME,
373 .pm = pm_sleep_ptr(&tcs3414_pm_ops),
374 },
375 .probe = tcs3414_probe,
376 .id_table = tcs3414_id,
377};
378module_i2c_driver(tcs3414_driver);
379
380MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
381MODULE_DESCRIPTION("TCS3414 digital color sensors driver");
382MODULE_LICENSE("GPL");
1/*
2 * tcs3414.c - Support for TAOS TCS3414 digital color 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 * 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.)
13 *
14 * TODO: sync, interrupt support, thresholds, prescaler
15 */
16
17#include <linux/module.h>
18#include <linux/i2c.h>
19#include <linux/delay.h>
20#include <linux/pm.h>
21
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>
27
28#define TCS3414_DRV_NAME "tcs3414"
29
30#define TCS3414_COMMAND BIT(7)
31#define TCS3414_COMMAND_WORD (TCS3414_COMMAND | BIT(5))
32
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)
41
42#define TCS3414_CONTROL_ADC_VALID BIT(4)
43#define TCS3414_CONTROL_ADC_EN BIT(1)
44#define TCS3414_CONTROL_POWER BIT(0)
45
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
50
51#define TCS3414_GAIN_MASK GENMASK(5, 4)
52#define TCS3414_GAIN_SHIFT 4
53
54struct 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 */
60};
61
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 }, \
77}
78
79/* scale factors: 1/gain */
80static const int tcs3414_scales[][2] = {
81 {1, 0}, {0, 250000}, {0, 62500}, {0, 15625}
82};
83
84/* integration time in ms */
85static const int tcs3414_times[] = { 12, 100, 400 };
86
87static 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),
93};
94
95static int tcs3414_req_data(struct tcs3414_data *data)
96{
97 int tries = 25;
98 int ret;
99
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;
104
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);
112 }
113
114 ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
115 data->control);
116 if (ret < 0)
117 return ret;
118
119 if (tries < 0) {
120 dev_err(&data->client->dev, "data not ready\n");
121 return -EIO;
122 }
123
124 return 0;
125}
126
127static int tcs3414_read_raw(struct iio_dev *indio_dev,
128 struct iio_chan_spec const *chan,
129 int *val, int *val2, long mask)
130{
131 struct tcs3414_data *data = iio_priv(indio_dev);
132 int i, ret;
133
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;
143 }
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;
159 }
160 return -EINVAL;
161}
162
163static int tcs3414_write_raw(struct iio_dev *indio_dev,
164 struct iio_chan_spec const *chan,
165 int val, int val2, long mask)
166{
167 struct tcs3414_data *data = iio_priv(indio_dev);
168 int i;
169
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);
180 }
181 }
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);
193 }
194 }
195 return -EINVAL;
196 default:
197 return -EINVAL;
198 }
199}
200
201static irqreturn_t tcs3414_trigger_handler(int irq, void *p)
202{
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;
207
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;
214
215 data->buffer[j++] = ret;
216 }
217
218 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
219 iio_get_time_ns(indio_dev));
220
221done:
222 iio_trigger_notify_done(indio_dev->trig);
223
224 return IRQ_HANDLED;
225}
226
227static IIO_CONST_ATTR(scale_available, "1 0.25 0.0625 0.015625");
228static IIO_CONST_ATTR_INT_TIME_AVAIL("0.012 0.1 0.4");
229
230static 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
234};
235
236static const struct attribute_group tcs3414_attribute_group = {
237 .attrs = tcs3414_attributes,
238};
239
240static 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,
245};
246
247static int tcs3414_buffer_preenable(struct iio_dev *indio_dev)
248{
249 struct tcs3414_data *data = iio_priv(indio_dev);
250
251 data->control |= TCS3414_CONTROL_ADC_EN;
252 return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
253 data->control);
254}
255
256static int tcs3414_buffer_predisable(struct iio_dev *indio_dev)
257{
258 struct tcs3414_data *data = iio_priv(indio_dev);
259 int ret;
260
261 ret = iio_triggered_buffer_predisable(indio_dev);
262 if (ret < 0)
263 return ret;
264
265 data->control &= ~TCS3414_CONTROL_ADC_EN;
266 return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
267 data->control);
268}
269
270static 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,
274};
275
276static int tcs3414_probe(struct i2c_client *client,
277 const struct i2c_device_id *id)
278{
279 struct tcs3414_data *data;
280 struct iio_dev *indio_dev;
281 int ret;
282
283 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
284 if (indio_dev == NULL)
285 return -ENOMEM;
286
287 data = iio_priv(indio_dev);
288 i2c_set_clientdata(client, indio_dev);
289 data->client = client;
290
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;
297
298 ret = i2c_smbus_read_byte_data(data->client, TCS3414_ID);
299 if (ret < 0)
300 return ret;
301
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;
311 }
312
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;
318
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;
324
325 ret = i2c_smbus_read_byte_data(data->client, TCS3414_GAIN);
326 if (ret < 0)
327 return ret;
328 data->gain = ret;
329
330 ret = iio_triggered_buffer_setup(indio_dev, NULL,
331 tcs3414_trigger_handler, &tcs3414_buffer_setup_ops);
332 if (ret < 0)
333 return ret;
334
335 ret = iio_device_register(indio_dev);
336 if (ret < 0)
337 goto buffer_cleanup;
338
339 return 0;
340
341buffer_cleanup:
342 iio_triggered_buffer_cleanup(indio_dev);
343 return ret;
344}
345
346static int tcs3414_powerdown(struct tcs3414_data *data)
347{
348 return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
349 data->control & ~(TCS3414_CONTROL_POWER |
350 TCS3414_CONTROL_ADC_EN));
351}
352
353static int tcs3414_remove(struct i2c_client *client)
354{
355 struct iio_dev *indio_dev = i2c_get_clientdata(client);
356
357 iio_device_unregister(indio_dev);
358 iio_triggered_buffer_cleanup(indio_dev);
359 tcs3414_powerdown(iio_priv(indio_dev));
360
361 return 0;
362}
363
364#ifdef CONFIG_PM_SLEEP
365static int tcs3414_suspend(struct device *dev)
366{
367 struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
368 to_i2c_client(dev)));
369 return tcs3414_powerdown(data);
370}
371
372static int tcs3414_resume(struct device *dev)
373{
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);
378}
379#endif
380
381static SIMPLE_DEV_PM_OPS(tcs3414_pm_ops, tcs3414_suspend, tcs3414_resume);
382
383static const struct i2c_device_id tcs3414_id[] = {
384 { "tcs3414", 0 },
385 { }
386};
387MODULE_DEVICE_TABLE(i2c, tcs3414_id);
388
389static struct i2c_driver tcs3414_driver = {
390 .driver = {
391 .name = TCS3414_DRV_NAME,
392 .pm = &tcs3414_pm_ops,
393 },
394 .probe = tcs3414_probe,
395 .remove = tcs3414_remove,
396 .id_table = tcs3414_id,
397};
398module_i2c_driver(tcs3414_driver);
399
400MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
401MODULE_DESCRIPTION("TCS3414 digital color sensors driver");
402MODULE_LICENSE("GPL");