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9#include <linux/interrupt.h>
10#include <linux/gpio.h>
11#include <linux/workqueue.h>
12#include <linux/device.h>
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/sysfs.h>
16#include <linux/list.h>
17#include <linux/i2c.h>
18#include <linux/rtc.h>
19
20#include "../iio.h"
21#include "../sysfs.h"
22
23
24
25
26
27#define AD7152_STATUS 0
28#define AD7152_STATUS_RDY1 (1 << 0)
29#define AD7152_STATUS_RDY2 (1 << 1)
30#define AD7152_CH1_DATA_HIGH 1
31#define AD7152_CH1_DATA_LOW 2
32#define AD7152_CH2_DATA_HIGH 3
33#define AD7152_CH2_DATA_LOW 4
34#define AD7152_CH1_OFFS_HIGH 5
35#define AD7152_CH1_OFFS_LOW 6
36#define AD7152_CH2_OFFS_HIGH 7
37#define AD7152_CH2_OFFS_LOW 8
38#define AD7152_CH1_GAIN_HIGH 9
39#define AD7152_CH1_GAIN_LOW 10
40#define AD7152_CH1_SETUP 11
41#define AD7152_CH2_GAIN_HIGH 12
42#define AD7152_CH2_GAIN_LOW 13
43#define AD7152_CH2_SETUP 14
44#define AD7152_CFG 15
45#define AD7152_RESEVERD 16
46#define AD7152_CAPDAC_POS 17
47#define AD7152_CAPDAC_NEG 18
48#define AD7152_CFG2 26
49
50#define AD7152_MAX_CONV_MODE 6
51
52
53
54
55
56struct ad7152_chip_info {
57 const char *name;
58 struct i2c_client *client;
59 struct iio_dev *indio_dev;
60 u16 ch1_offset;
61 u16 ch1_gain;
62 u8 ch1_setup;
63 u16 ch2_offset;
64 u16 ch2_gain;
65 u8 ch2_setup;
66 u8 filter_rate_setup;
67 char *conversion_mode;
68};
69
70struct ad7152_conversion_mode {
71 char *name;
72 u8 reg_cfg;
73};
74
75struct ad7152_conversion_mode ad7152_conv_mode_table[AD7152_MAX_CONV_MODE] = {
76 { "idle", 0 },
77 { "continuous-conversion", 1 },
78 { "single-conversion", 2 },
79 { "power-down", 3 },
80 { "offset-calibration", 5 },
81 { "gain-calibration", 6 },
82};
83
84
85
86
87
88static int ad7152_i2c_read(struct ad7152_chip_info *chip, u8 reg, u8 *data, int len)
89{
90 struct i2c_client *client = chip->client;
91 int ret;
92
93 ret = i2c_master_send(client, ®, 1);
94 if (ret < 0) {
95 dev_err(&client->dev, "I2C write error\n");
96 return ret;
97 }
98
99 ret = i2c_master_recv(client, data, len);
100 if (ret < 0) {
101 dev_err(&client->dev, "I2C read error\n");
102 }
103
104 return ret;
105}
106
107static int ad7152_i2c_write(struct ad7152_chip_info *chip, u8 reg, u8 data)
108{
109 struct i2c_client *client = chip->client;
110 int ret;
111
112 u8 tx[2] = {
113 reg,
114 data,
115 };
116
117 ret = i2c_master_send(client, tx, 2);
118 if (ret < 0)
119 dev_err(&client->dev, "I2C write error\n");
120
121 return ret;
122}
123
124
125
126
127
128#define IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(_show) \
129 IIO_DEVICE_ATTR(available_conversion_modes, S_IRUGO, _show, NULL, 0)
130#define IIO_DEV_ATTR_CONVERSION_MODE(_mode, _show, _store) \
131 IIO_DEVICE_ATTR(conversion_mode, _mode, _show, _store, 0)
132#define IIO_DEV_ATTR_CH1_OFFSET(_mode, _show, _store) \
133 IIO_DEVICE_ATTR(ch1_offset, _mode, _show, _store, 0)
134#define IIO_DEV_ATTR_CH2_OFFSET(_mode, _show, _store) \
135 IIO_DEVICE_ATTR(ch2_offset, _mode, _show, _store, 0)
136#define IIO_DEV_ATTR_CH1_GAIN(_mode, _show, _store) \
137 IIO_DEVICE_ATTR(ch1_gain, _mode, _show, _store, 0)
138#define IIO_DEV_ATTR_CH2_GAIN(_mode, _show, _store) \
139 IIO_DEVICE_ATTR(ch2_gain, _mode, _show, _store, 0)
140#define IIO_DEV_ATTR_CH1_VALUE(_show) \
141 IIO_DEVICE_ATTR(ch1_value, S_IRUGO, _show, NULL, 0)
142#define IIO_DEV_ATTR_CH2_VALUE(_show) \
143 IIO_DEVICE_ATTR(ch2_value, S_IRUGO, _show, NULL, 0)
144#define IIO_DEV_ATTR_CH1_SETUP(_mode, _show, _store) \
145 IIO_DEVICE_ATTR(ch1_setup, _mode, _show, _store, 0)
146#define IIO_DEV_ATTR_CH2_SETUP(_mode, _show, _store) \
147 IIO_DEVICE_ATTR(ch2_setup, _mode, _show, _store, 0)
148#define IIO_DEV_ATTR_FILTER_RATE_SETUP(_mode, _show, _store) \
149 IIO_DEVICE_ATTR(filter_rate_setup, _mode, _show, _store, 0)
150
151static ssize_t ad7152_show_conversion_modes(struct device *dev,
152 struct device_attribute *attr,
153 char *buf)
154{
155 int i;
156 int len = 0;
157
158 for (i = 0; i < AD7152_MAX_CONV_MODE; i++)
159 len += sprintf(buf + len, "%s ", ad7152_conv_mode_table[i].name);
160
161 len += sprintf(buf + len, "\n");
162
163 return len;
164}
165
166static IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(ad7152_show_conversion_modes);
167
168static ssize_t ad7152_show_ch1_value(struct device *dev,
169 struct device_attribute *attr,
170 char *buf)
171{
172 struct iio_dev *dev_info = dev_get_drvdata(dev);
173 struct ad7152_chip_info *chip = dev_info->dev_data;
174 u8 data[2];
175
176 ad7152_i2c_read(chip, AD7152_CH1_DATA_HIGH, data, 2);
177 return sprintf(buf, "%d\n", ((int)data[0] << 8) | data[1]);
178}
179
180static IIO_DEV_ATTR_CH1_VALUE(ad7152_show_ch1_value);
181
182static ssize_t ad7152_show_ch2_value(struct device *dev,
183 struct device_attribute *attr,
184 char *buf)
185{
186 struct iio_dev *dev_info = dev_get_drvdata(dev);
187 struct ad7152_chip_info *chip = dev_info->dev_data;
188 u8 data[2];
189
190 ad7152_i2c_read(chip, AD7152_CH2_DATA_HIGH, data, 2);
191 return sprintf(buf, "%d\n", ((int)data[0] << 8) | data[1]);
192}
193
194static IIO_DEV_ATTR_CH2_VALUE(ad7152_show_ch2_value);
195
196static ssize_t ad7152_show_conversion_mode(struct device *dev,
197 struct device_attribute *attr,
198 char *buf)
199{
200 struct iio_dev *dev_info = dev_get_drvdata(dev);
201 struct ad7152_chip_info *chip = dev_info->dev_data;
202
203 return sprintf(buf, "%s\n", chip->conversion_mode);
204}
205
206static ssize_t ad7152_store_conversion_mode(struct device *dev,
207 struct device_attribute *attr,
208 const char *buf,
209 size_t len)
210{
211 struct iio_dev *dev_info = dev_get_drvdata(dev);
212 struct ad7152_chip_info *chip = dev_info->dev_data;
213 u8 cfg;
214 int i;
215
216 ad7152_i2c_read(chip, AD7152_CFG, &cfg, 1);
217
218 for (i = 0; i < AD7152_MAX_CONV_MODE; i++)
219 if (strncmp(buf, ad7152_conv_mode_table[i].name,
220 strlen(ad7152_conv_mode_table[i].name) - 1) == 0) {
221 chip->conversion_mode = ad7152_conv_mode_table[i].name;
222 cfg |= 0x18 | ad7152_conv_mode_table[i].reg_cfg;
223 ad7152_i2c_write(chip, AD7152_CFG, cfg);
224 return len;
225 }
226
227 dev_err(dev, "not supported conversion mode\n");
228
229 return -EINVAL;
230}
231
232static IIO_DEV_ATTR_CONVERSION_MODE(S_IRUGO | S_IWUSR,
233 ad7152_show_conversion_mode,
234 ad7152_store_conversion_mode);
235
236static ssize_t ad7152_show_ch1_offset(struct device *dev,
237 struct device_attribute *attr,
238 char *buf)
239{
240 struct iio_dev *dev_info = dev_get_drvdata(dev);
241 struct ad7152_chip_info *chip = dev_info->dev_data;
242
243 return sprintf(buf, "%d\n", chip->ch1_offset);
244}
245
246static ssize_t ad7152_store_ch1_offset(struct device *dev,
247 struct device_attribute *attr,
248 const char *buf,
249 size_t len)
250{
251 struct iio_dev *dev_info = dev_get_drvdata(dev);
252 struct ad7152_chip_info *chip = dev_info->dev_data;
253 unsigned long data;
254 int ret;
255
256 ret = strict_strtoul(buf, 10, &data);
257
258 if ((!ret) && (data < 0x10000)) {
259 ad7152_i2c_write(chip, AD7152_CH1_OFFS_HIGH, data >> 8);
260 ad7152_i2c_write(chip, AD7152_CH1_OFFS_LOW, data);
261 chip->ch1_offset = data;
262 return len;
263 }
264
265 return -EINVAL;
266}
267
268static IIO_DEV_ATTR_CH1_OFFSET(S_IRUGO | S_IWUSR,
269 ad7152_show_ch1_offset,
270 ad7152_store_ch1_offset);
271
272static ssize_t ad7152_show_ch2_offset(struct device *dev,
273 struct device_attribute *attr,
274 char *buf)
275{
276 struct iio_dev *dev_info = dev_get_drvdata(dev);
277 struct ad7152_chip_info *chip = dev_info->dev_data;
278
279 return sprintf(buf, "%d\n", chip->ch2_offset);
280}
281
282static ssize_t ad7152_store_ch2_offset(struct device *dev,
283 struct device_attribute *attr,
284 const char *buf,
285 size_t len)
286{
287 struct iio_dev *dev_info = dev_get_drvdata(dev);
288 struct ad7152_chip_info *chip = dev_info->dev_data;
289 unsigned long data;
290 int ret;
291
292 ret = strict_strtoul(buf, 10, &data);
293
294 if ((!ret) && (data < 0x10000)) {
295 ad7152_i2c_write(chip, AD7152_CH2_OFFS_HIGH, data >> 8);
296 ad7152_i2c_write(chip, AD7152_CH2_OFFS_LOW, data);
297 chip->ch2_offset = data;
298 return len;
299 }
300
301 return -EINVAL;
302}
303
304static IIO_DEV_ATTR_CH2_OFFSET(S_IRUGO | S_IWUSR,
305 ad7152_show_ch2_offset,
306 ad7152_store_ch2_offset);
307
308static ssize_t ad7152_show_ch1_gain(struct device *dev,
309 struct device_attribute *attr,
310 char *buf)
311{
312 struct iio_dev *dev_info = dev_get_drvdata(dev);
313 struct ad7152_chip_info *chip = dev_info->dev_data;
314
315 return sprintf(buf, "%d\n", chip->ch1_gain);
316}
317
318static ssize_t ad7152_store_ch1_gain(struct device *dev,
319 struct device_attribute *attr,
320 const char *buf,
321 size_t len)
322{
323 struct iio_dev *dev_info = dev_get_drvdata(dev);
324 struct ad7152_chip_info *chip = dev_info->dev_data;
325 unsigned long data;
326 int ret;
327
328 ret = strict_strtoul(buf, 10, &data);
329
330 if ((!ret) && (data < 0x10000)) {
331 ad7152_i2c_write(chip, AD7152_CH1_GAIN_HIGH, data >> 8);
332 ad7152_i2c_write(chip, AD7152_CH1_GAIN_LOW, data);
333 chip->ch1_gain = data;
334 return len;
335 }
336
337 return -EINVAL;
338}
339
340static IIO_DEV_ATTR_CH1_GAIN(S_IRUGO | S_IWUSR,
341 ad7152_show_ch1_gain,
342 ad7152_store_ch1_gain);
343
344static ssize_t ad7152_show_ch2_gain(struct device *dev,
345 struct device_attribute *attr,
346 char *buf)
347{
348 struct iio_dev *dev_info = dev_get_drvdata(dev);
349 struct ad7152_chip_info *chip = dev_info->dev_data;
350
351 return sprintf(buf, "%d\n", chip->ch2_gain);
352}
353
354static ssize_t ad7152_store_ch2_gain(struct device *dev,
355 struct device_attribute *attr,
356 const char *buf,
357 size_t len)
358{
359 struct iio_dev *dev_info = dev_get_drvdata(dev);
360 struct ad7152_chip_info *chip = dev_info->dev_data;
361 unsigned long data;
362 int ret;
363
364 ret = strict_strtoul(buf, 10, &data);
365
366 if ((!ret) && (data < 0x10000)) {
367 ad7152_i2c_write(chip, AD7152_CH2_GAIN_HIGH, data >> 8);
368 ad7152_i2c_write(chip, AD7152_CH2_GAIN_LOW, data);
369 chip->ch2_gain = data;
370 return len;
371 }
372
373 return -EINVAL;
374}
375
376static IIO_DEV_ATTR_CH2_GAIN(S_IRUGO | S_IWUSR,
377 ad7152_show_ch2_gain,
378 ad7152_store_ch2_gain);
379
380static ssize_t ad7152_show_ch1_setup(struct device *dev,
381 struct device_attribute *attr,
382 char *buf)
383{
384 struct iio_dev *dev_info = dev_get_drvdata(dev);
385 struct ad7152_chip_info *chip = dev_info->dev_data;
386
387 return sprintf(buf, "0x%02x\n", chip->ch1_setup);
388}
389
390static ssize_t ad7152_store_ch1_setup(struct device *dev,
391 struct device_attribute *attr,
392 const char *buf,
393 size_t len)
394{
395 struct iio_dev *dev_info = dev_get_drvdata(dev);
396 struct ad7152_chip_info *chip = dev_info->dev_data;
397 unsigned long data;
398 int ret;
399
400 ret = strict_strtoul(buf, 10, &data);
401
402 if ((!ret) && (data < 0x100)) {
403 ad7152_i2c_write(chip, AD7152_CH1_SETUP, data);
404 chip->ch1_setup = data;
405 return len;
406 }
407
408 return -EINVAL;
409}
410
411static IIO_DEV_ATTR_CH1_SETUP(S_IRUGO | S_IWUSR,
412 ad7152_show_ch1_setup,
413 ad7152_store_ch1_setup);
414
415static ssize_t ad7152_show_ch2_setup(struct device *dev,
416 struct device_attribute *attr,
417 char *buf)
418{
419 struct iio_dev *dev_info = dev_get_drvdata(dev);
420 struct ad7152_chip_info *chip = dev_info->dev_data;
421
422 return sprintf(buf, "0x%02x\n", chip->ch2_setup);
423}
424
425static ssize_t ad7152_store_ch2_setup(struct device *dev,
426 struct device_attribute *attr,
427 const char *buf,
428 size_t len)
429{
430 struct iio_dev *dev_info = dev_get_drvdata(dev);
431 struct ad7152_chip_info *chip = dev_info->dev_data;
432 unsigned long data;
433 int ret;
434
435 ret = strict_strtoul(buf, 10, &data);
436
437 if ((!ret) && (data < 0x100)) {
438 ad7152_i2c_write(chip, AD7152_CH2_SETUP, data);
439 chip->ch2_setup = data;
440 return len;
441 }
442
443 return -EINVAL;
444}
445
446static IIO_DEV_ATTR_CH2_SETUP(S_IRUGO | S_IWUSR,
447 ad7152_show_ch2_setup,
448 ad7152_store_ch2_setup);
449
450static ssize_t ad7152_show_filter_rate_setup(struct device *dev,
451 struct device_attribute *attr,
452 char *buf)
453{
454 struct iio_dev *dev_info = dev_get_drvdata(dev);
455 struct ad7152_chip_info *chip = dev_info->dev_data;
456
457 return sprintf(buf, "0x%02x\n", chip->filter_rate_setup);
458}
459
460static ssize_t ad7152_store_filter_rate_setup(struct device *dev,
461 struct device_attribute *attr,
462 const char *buf,
463 size_t len)
464{
465 struct iio_dev *dev_info = dev_get_drvdata(dev);
466 struct ad7152_chip_info *chip = dev_info->dev_data;
467 unsigned long data;
468 int ret;
469
470 ret = strict_strtoul(buf, 10, &data);
471
472 if ((!ret) && (data < 0x100)) {
473 ad7152_i2c_write(chip, AD7152_CFG2, data);
474 chip->filter_rate_setup = data;
475 return len;
476 }
477
478 return -EINVAL;
479}
480
481static IIO_DEV_ATTR_FILTER_RATE_SETUP(S_IRUGO | S_IWUSR,
482 ad7152_show_filter_rate_setup,
483 ad7152_store_filter_rate_setup);
484
485static ssize_t ad7152_show_name(struct device *dev,
486 struct device_attribute *attr,
487 char *buf)
488{
489 struct iio_dev *dev_info = dev_get_drvdata(dev);
490 struct ad7152_chip_info *chip = dev_info->dev_data;
491 return sprintf(buf, "%s\n", chip->name);
492}
493
494static IIO_DEVICE_ATTR(name, S_IRUGO, ad7152_show_name, NULL, 0);
495
496static struct attribute *ad7152_attributes[] = {
497 &iio_dev_attr_available_conversion_modes.dev_attr.attr,
498 &iio_dev_attr_conversion_mode.dev_attr.attr,
499 &iio_dev_attr_ch1_gain.dev_attr.attr,
500 &iio_dev_attr_ch2_gain.dev_attr.attr,
501 &iio_dev_attr_ch1_offset.dev_attr.attr,
502 &iio_dev_attr_ch2_offset.dev_attr.attr,
503 &iio_dev_attr_ch1_value.dev_attr.attr,
504 &iio_dev_attr_ch2_value.dev_attr.attr,
505 &iio_dev_attr_ch1_setup.dev_attr.attr,
506 &iio_dev_attr_ch2_setup.dev_attr.attr,
507 &iio_dev_attr_filter_rate_setup.dev_attr.attr,
508 &iio_dev_attr_name.dev_attr.attr,
509 NULL,
510};
511
512static const struct attribute_group ad7152_attribute_group = {
513 .attrs = ad7152_attributes,
514};
515
516
517
518
519
520static int __devinit ad7152_probe(struct i2c_client *client,
521 const struct i2c_device_id *id)
522{
523 int ret = 0;
524 struct ad7152_chip_info *chip = kzalloc(sizeof(*chip), GFP_KERNEL);
525 if (chip == NULL) {
526 ret = -ENOMEM;
527 goto error_ret;
528 }
529
530
531 i2c_set_clientdata(client, chip);
532
533 chip->client = client;
534 chip->name = id->name;
535
536 chip->indio_dev = iio_allocate_device();
537 if (chip->indio_dev == NULL) {
538 ret = -ENOMEM;
539 goto error_free_chip;
540 }
541
542
543 chip->indio_dev->dev.parent = &client->dev;
544 chip->indio_dev->attrs = &ad7152_attribute_group;
545 chip->indio_dev->dev_data = (void *)(chip);
546 chip->indio_dev->driver_module = THIS_MODULE;
547 chip->indio_dev->modes = INDIO_DIRECT_MODE;
548
549 ret = iio_device_register(chip->indio_dev);
550 if (ret)
551 goto error_free_dev;
552
553 dev_err(&client->dev, "%s capacitive sensor registered\n", id->name);
554
555 return 0;
556
557error_free_dev:
558 iio_free_device(chip->indio_dev);
559error_free_chip:
560 kfree(chip);
561error_ret:
562 return ret;
563}
564
565static int __devexit ad7152_remove(struct i2c_client *client)
566{
567 struct ad7152_chip_info *chip = i2c_get_clientdata(client);
568 struct iio_dev *indio_dev = chip->indio_dev;
569
570 if (client->irq && gpio_is_valid(irq_to_gpio(client->irq)) > 0)
571 iio_unregister_interrupt_line(indio_dev, 0);
572 iio_device_unregister(indio_dev);
573 kfree(chip);
574
575 return 0;
576}
577
578static const struct i2c_device_id ad7152_id[] = {
579 { "ad7152", 0 },
580 { "ad7153", 0 },
581 {}
582};
583
584MODULE_DEVICE_TABLE(i2c, ad7152_id);
585
586static struct i2c_driver ad7152_driver = {
587 .driver = {
588 .name = "ad7152",
589 },
590 .probe = ad7152_probe,
591 .remove = __devexit_p(ad7152_remove),
592 .id_table = ad7152_id,
593};
594
595static __init int ad7152_init(void)
596{
597 return i2c_add_driver(&ad7152_driver);
598}
599
600static __exit void ad7152_exit(void)
601{
602 i2c_del_driver(&ad7152_driver);
603}
604
605MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
606MODULE_DESCRIPTION("Analog Devices ad7152/3 capacitive sensor driver");
607MODULE_LICENSE("GPL v2");
608
609module_init(ad7152_init);
610module_exit(ad7152_exit);
611
