1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * bma180.c - IIO driver for Bosch BMA180 triaxial acceleration sensor
4 *
5 * Copyright 2013 Oleksandr Kravchenko <x0199363@ti.com>
6 *
7 * Support for BMA250 (c) Peter Meerwald <pmeerw@pmeerw.net>
8 *
9 * SPI is not supported by driver
10 * BMA023/BMA150/SMB380: 7-bit I2C slave address 0x38
11 * BMA180: 7-bit I2C slave address 0x40 or 0x41
12 * BMA250: 7-bit I2C slave address 0x18 or 0x19
13 */
14
15 #include <linux/module.h>
16 #include <linux/mod_devicetable.h>
17 #include <linux/i2c.h>
18 #include <linux/interrupt.h>
19 #include <linux/delay.h>
20 #include <linux/bitops.h>
21 #include <linux/regulator/consumer.h>
22 #include <linux/slab.h>
23 #include <linux/string.h>
24 #include <linux/types.h>
25 #include <linux/iio/iio.h>
26 #include <linux/iio/sysfs.h>
27 #include <linux/iio/buffer.h>
28 #include <linux/iio/trigger.h>
29 #include <linux/iio/trigger_consumer.h>
30 #include <linux/iio/triggered_buffer.h>
31
32 #define BMA180_DRV_NAME "bma180"
33 #define BMA180_IRQ_NAME "bma180_event"
34
35 enum chip_ids {
36 BMA023,
37 BMA150,
38 BMA180,
39 BMA250,
40 };
41
42 struct bma180_data;
43
44 struct bma180_part_info {
45 u8 chip_id;
46 const struct iio_chan_spec *channels;
47 unsigned int num_channels;
48 const int *scale_table;
49 unsigned int num_scales;
50 const int *bw_table;
51 unsigned int num_bw;
52 int temp_offset;
53
54 u8 int_reset_reg, int_reset_mask;
55 u8 sleep_reg, sleep_mask;
56 u8 bw_reg, bw_mask, bw_offset;
57 u8 scale_reg, scale_mask;
58 u8 power_reg, power_mask, lowpower_val;
59 u8 int_enable_reg, int_enable_mask;
60 u8 softreset_reg, softreset_val;
61
62 int (*chip_config)(struct bma180_data *data);
63 void (*chip_disable)(struct bma180_data *data);
64 };
65
66 /* Register set */
67 #define BMA023_CTRL_REG0 0x0a
68 #define BMA023_CTRL_REG1 0x0b
69 #define BMA023_CTRL_REG2 0x14
70 #define BMA023_CTRL_REG3 0x15
71
72 #define BMA023_RANGE_MASK GENMASK(4, 3) /* Range of accel values */
73 #define BMA023_BW_MASK GENMASK(2, 0) /* Accel bandwidth */
74 #define BMA023_SLEEP BIT(0)
75 #define BMA023_INT_RESET_MASK BIT(6)
76 #define BMA023_NEW_DATA_INT BIT(5) /* Intr every new accel data is ready */
77 #define BMA023_RESET_VAL BIT(1)
78
79 #define BMA180_CHIP_ID 0x00 /* Need to distinguish BMA180 from other */
80 #define BMA180_ACC_X_LSB 0x02 /* First of 6 registers of accel data */
81 #define BMA180_TEMP 0x08
82 #define BMA180_CTRL_REG0 0x0d
83 #define BMA180_RESET 0x10
84 #define BMA180_BW_TCS 0x20
85 #define BMA180_CTRL_REG3 0x21
86 #define BMA180_TCO_Z 0x30
87 #define BMA180_OFFSET_LSB1 0x35
88
89 /* BMA180_CTRL_REG0 bits */
90 #define BMA180_DIS_WAKE_UP BIT(0) /* Disable wake up mode */
91 #define BMA180_SLEEP BIT(1) /* 1 - chip will sleep */
92 #define BMA180_EE_W BIT(4) /* Unlock writing to addr from 0x20 */
93 #define BMA180_RESET_INT BIT(6) /* Reset pending interrupts */
94
95 /* BMA180_CTRL_REG3 bits */
96 #define BMA180_NEW_DATA_INT BIT(1) /* Intr every new accel data is ready */
97
98 /* BMA180_OFFSET_LSB1 skipping mode bit */
99 #define BMA180_SMP_SKIP BIT(0)
100
101 /* Bit masks for registers bit fields */
102 #define BMA180_RANGE 0x0e /* Range of measured accel values */
103 #define BMA180_BW 0xf0 /* Accel bandwidth */
104 #define BMA180_MODE_CONFIG 0x03 /* Config operation modes */
105
106 /* We have to write this value in reset register to do soft reset */
107 #define BMA180_RESET_VAL 0xb6
108
109 #define BMA023_ID_REG_VAL 0x02
110 #define BMA180_ID_REG_VAL 0x03
111 #define BMA250_ID_REG_VAL 0x03
112
113 /* Chip power modes */
114 #define BMA180_LOW_POWER 0x03
115
116 #define BMA250_RANGE_REG 0x0f
117 #define BMA250_BW_REG 0x10
118 #define BMA250_POWER_REG 0x11
119 #define BMA250_RESET_REG 0x14
120 #define BMA250_INT_ENABLE_REG 0x17
121 #define BMA250_INT_MAP_REG 0x1a
122 #define BMA250_INT_RESET_REG 0x21
123
124 #define BMA250_RANGE_MASK GENMASK(3, 0) /* Range of accel values */
125 #define BMA250_BW_MASK GENMASK(4, 0) /* Accel bandwidth */
126 #define BMA250_BW_OFFSET 8
127 #define BMA250_SUSPEND_MASK BIT(7) /* chip will sleep */
128 #define BMA250_LOWPOWER_MASK BIT(6)
129 #define BMA250_DATA_INTEN_MASK BIT(4)
130 #define BMA250_INT1_DATA_MASK BIT(0)
131 #define BMA250_INT_RESET_MASK BIT(7) /* Reset pending interrupts */
132
133 struct bma180_data {
134 struct regulator *vdd_supply;
135 struct regulator *vddio_supply;
136 struct i2c_client *client;
137 struct iio_trigger *trig;
138 const struct bma180_part_info *part_info;
139 struct iio_mount_matrix orientation;
140 struct mutex mutex;
141 bool sleep_state;
142 int scale;
143 int bw;
144 bool pmode;
145 /* Ensure timestamp is naturally aligned */
146 struct {
147 s16 chan[4];
148 aligned_s64 timestamp;
149 } scan;
150 };
151
152 enum bma180_chan {
153 AXIS_X,
154 AXIS_Y,
155 AXIS_Z,
156 TEMP
157 };
158
159 static int bma023_bw_table[] = { 25, 50, 100, 190, 375, 750, 1500 }; /* Hz */
160 static int bma023_scale_table[] = { 2452, 4903, 9709, };
161
162 static int bma180_bw_table[] = { 10, 20, 40, 75, 150, 300 }; /* Hz */
163 static int bma180_scale_table[] = { 1275, 1863, 2452, 3727, 4903, 9709, 19417 };
164
165 static int bma250_bw_table[] = { 8, 16, 31, 63, 125, 250, 500, 1000 }; /* Hz */
166 static int bma250_scale_table[] = { 0, 0, 0, 38344, 0, 76590, 0, 0, 153180, 0,
167 0, 0, 306458 };
168
bma180_get_data_reg(struct bma180_data * data,enum bma180_chan chan)169 static int bma180_get_data_reg(struct bma180_data *data, enum bma180_chan chan)
170 {
171 int ret;
172
173 if (data->sleep_state)
174 return -EBUSY;
175
176 switch (chan) {
177 case TEMP:
178 ret = i2c_smbus_read_byte_data(data->client, BMA180_TEMP);
179 if (ret < 0)
180 dev_err(&data->client->dev, "failed to read temp register\n");
181 break;
182 default:
183 ret = i2c_smbus_read_word_data(data->client,
184 BMA180_ACC_X_LSB + chan * 2);
185 if (ret < 0)
186 dev_err(&data->client->dev,
187 "failed to read accel_%c register\n",
188 'x' + chan);
189 }
190
191 return ret;
192 }
193
bma180_set_bits(struct bma180_data * data,u8 reg,u8 mask,u8 val)194 static int bma180_set_bits(struct bma180_data *data, u8 reg, u8 mask, u8 val)
195 {
196 int ret = i2c_smbus_read_byte_data(data->client, reg);
197 u8 reg_val = (ret & ~mask) | (val << (ffs(mask) - 1));
198
199 if (ret < 0)
200 return ret;
201
202 return i2c_smbus_write_byte_data(data->client, reg, reg_val);
203 }
204
bma180_reset_intr(struct bma180_data * data)205 static int bma180_reset_intr(struct bma180_data *data)
206 {
207 int ret = bma180_set_bits(data, data->part_info->int_reset_reg,
208 data->part_info->int_reset_mask, 1);
209
210 if (ret)
211 dev_err(&data->client->dev, "failed to reset interrupt\n");
212
213 return ret;
214 }
215
bma180_set_new_data_intr_state(struct bma180_data * data,bool state)216 static int bma180_set_new_data_intr_state(struct bma180_data *data, bool state)
217 {
218 int ret = bma180_set_bits(data, data->part_info->int_enable_reg,
219 data->part_info->int_enable_mask, state);
220 if (ret)
221 goto err;
222 ret = bma180_reset_intr(data);
223 if (ret)
224 goto err;
225
226 return 0;
227
228 err:
229 dev_err(&data->client->dev,
230 "failed to set new data interrupt state %d\n", state);
231 return ret;
232 }
233
bma180_set_sleep_state(struct bma180_data * data,bool state)234 static int bma180_set_sleep_state(struct bma180_data *data, bool state)
235 {
236 int ret = bma180_set_bits(data, data->part_info->sleep_reg,
237 data->part_info->sleep_mask, state);
238
239 if (ret) {
240 dev_err(&data->client->dev,
241 "failed to set sleep state %d\n", state);
242 return ret;
243 }
244 data->sleep_state = state;
245
246 return 0;
247 }
248
bma180_set_ee_writing_state(struct bma180_data * data,bool state)249 static int bma180_set_ee_writing_state(struct bma180_data *data, bool state)
250 {
251 int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_EE_W, state);
252
253 if (ret)
254 dev_err(&data->client->dev,
255 "failed to set ee writing state %d\n", state);
256
257 return ret;
258 }
259
bma180_set_bw(struct bma180_data * data,int val)260 static int bma180_set_bw(struct bma180_data *data, int val)
261 {
262 int ret, i;
263
264 if (data->sleep_state)
265 return -EBUSY;
266
267 for (i = 0; i < data->part_info->num_bw; ++i) {
268 if (data->part_info->bw_table[i] == val) {
269 ret = bma180_set_bits(data, data->part_info->bw_reg,
270 data->part_info->bw_mask,
271 i + data->part_info->bw_offset);
272 if (ret) {
273 dev_err(&data->client->dev,
274 "failed to set bandwidth\n");
275 return ret;
276 }
277 data->bw = val;
278 return 0;
279 }
280 }
281
282 return -EINVAL;
283 }
284
bma180_set_scale(struct bma180_data * data,int val)285 static int bma180_set_scale(struct bma180_data *data, int val)
286 {
287 int ret, i;
288
289 if (data->sleep_state)
290 return -EBUSY;
291
292 for (i = 0; i < data->part_info->num_scales; ++i)
293 if (data->part_info->scale_table[i] == val) {
294 ret = bma180_set_bits(data, data->part_info->scale_reg,
295 data->part_info->scale_mask, i);
296 if (ret) {
297 dev_err(&data->client->dev,
298 "failed to set scale\n");
299 return ret;
300 }
301 data->scale = val;
302 return 0;
303 }
304
305 return -EINVAL;
306 }
307
bma180_set_pmode(struct bma180_data * data,bool mode)308 static int bma180_set_pmode(struct bma180_data *data, bool mode)
309 {
310 u8 reg_val = mode ? data->part_info->lowpower_val : 0;
311 int ret = bma180_set_bits(data, data->part_info->power_reg,
312 data->part_info->power_mask, reg_val);
313
314 if (ret) {
315 dev_err(&data->client->dev, "failed to set power mode\n");
316 return ret;
317 }
318 data->pmode = mode;
319
320 return 0;
321 }
322
bma180_soft_reset(struct bma180_data * data)323 static int bma180_soft_reset(struct bma180_data *data)
324 {
325 int ret = i2c_smbus_write_byte_data(data->client,
326 data->part_info->softreset_reg,
327 data->part_info->softreset_val);
328
329 if (ret)
330 dev_err(&data->client->dev, "failed to reset the chip\n");
331
332 return ret;
333 }
334
bma180_chip_init(struct bma180_data * data)335 static int bma180_chip_init(struct bma180_data *data)
336 {
337 /* Try to read chip_id register. It must return 0x03. */
338 int ret = i2c_smbus_read_byte_data(data->client, BMA180_CHIP_ID);
339
340 if (ret < 0)
341 return ret;
342 if (ret != data->part_info->chip_id) {
343 dev_err(&data->client->dev, "wrong chip ID %d expected %d\n",
344 ret, data->part_info->chip_id);
345 return -ENODEV;
346 }
347
348 ret = bma180_soft_reset(data);
349 if (ret)
350 return ret;
351 /*
352 * No serial transaction should occur within minimum 10 us
353 * after soft_reset command
354 */
355 msleep(20);
356
357 return bma180_set_new_data_intr_state(data, false);
358 }
359
bma023_chip_config(struct bma180_data * data)360 static int bma023_chip_config(struct bma180_data *data)
361 {
362 int ret = bma180_chip_init(data);
363
364 if (ret)
365 goto err;
366
367 ret = bma180_set_bw(data, 50); /* 50 Hz */
368 if (ret)
369 goto err;
370 ret = bma180_set_scale(data, 2452); /* 2 G */
371 if (ret)
372 goto err;
373
374 return 0;
375
376 err:
377 dev_err(&data->client->dev, "failed to config the chip\n");
378 return ret;
379 }
380
bma180_chip_config(struct bma180_data * data)381 static int bma180_chip_config(struct bma180_data *data)
382 {
383 int ret = bma180_chip_init(data);
384
385 if (ret)
386 goto err;
387 ret = bma180_set_pmode(data, false);
388 if (ret)
389 goto err;
390 ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_DIS_WAKE_UP, 1);
391 if (ret)
392 goto err;
393 ret = bma180_set_ee_writing_state(data, true);
394 if (ret)
395 goto err;
396 ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP, 1);
397 if (ret)
398 goto err;
399 ret = bma180_set_bw(data, 20); /* 20 Hz */
400 if (ret)
401 goto err;
402 ret = bma180_set_scale(data, 2452); /* 2 G */
403 if (ret)
404 goto err;
405
406 return 0;
407
408 err:
409 dev_err(&data->client->dev, "failed to config the chip\n");
410 return ret;
411 }
412
bma250_chip_config(struct bma180_data * data)413 static int bma250_chip_config(struct bma180_data *data)
414 {
415 int ret = bma180_chip_init(data);
416
417 if (ret)
418 goto err;
419 ret = bma180_set_pmode(data, false);
420 if (ret)
421 goto err;
422 ret = bma180_set_bw(data, 16); /* 16 Hz */
423 if (ret)
424 goto err;
425 ret = bma180_set_scale(data, 38344); /* 2 G */
426 if (ret)
427 goto err;
428 /*
429 * This enables dataready interrupt on the INT1 pin
430 * FIXME: support using the INT2 pin
431 */
432 ret = bma180_set_bits(data, BMA250_INT_MAP_REG, BMA250_INT1_DATA_MASK, 1);
433 if (ret)
434 goto err;
435
436 return 0;
437
438 err:
439 dev_err(&data->client->dev, "failed to config the chip\n");
440 return ret;
441 }
442
bma023_chip_disable(struct bma180_data * data)443 static void bma023_chip_disable(struct bma180_data *data)
444 {
445 if (bma180_set_sleep_state(data, true))
446 goto err;
447
448 return;
449
450 err:
451 dev_err(&data->client->dev, "failed to disable the chip\n");
452 }
453
bma180_chip_disable(struct bma180_data * data)454 static void bma180_chip_disable(struct bma180_data *data)
455 {
456 if (bma180_set_new_data_intr_state(data, false))
457 goto err;
458 if (bma180_set_ee_writing_state(data, false))
459 goto err;
460 if (bma180_set_sleep_state(data, true))
461 goto err;
462
463 return;
464
465 err:
466 dev_err(&data->client->dev, "failed to disable the chip\n");
467 }
468
bma250_chip_disable(struct bma180_data * data)469 static void bma250_chip_disable(struct bma180_data *data)
470 {
471 if (bma180_set_new_data_intr_state(data, false))
472 goto err;
473 if (bma180_set_sleep_state(data, true))
474 goto err;
475
476 return;
477
478 err:
479 dev_err(&data->client->dev, "failed to disable the chip\n");
480 }
481
bma180_show_avail(char * buf,const int * vals,unsigned int n,bool micros)482 static ssize_t bma180_show_avail(char *buf, const int *vals, unsigned int n,
483 bool micros)
484 {
485 size_t len = 0;
486 int i;
487
488 for (i = 0; i < n; i++) {
489 if (!vals[i])
490 continue;
491 len += scnprintf(buf + len, PAGE_SIZE - len,
492 micros ? "0.%06d " : "%d ", vals[i]);
493 }
494 buf[len - 1] = '\n';
495
496 return len;
497 }
498
bma180_show_filter_freq_avail(struct device * dev,struct device_attribute * attr,char * buf)499 static ssize_t bma180_show_filter_freq_avail(struct device *dev,
500 struct device_attribute *attr, char *buf)
501 {
502 struct bma180_data *data = iio_priv(dev_to_iio_dev(dev));
503
504 return bma180_show_avail(buf, data->part_info->bw_table,
505 data->part_info->num_bw, false);
506 }
507
bma180_show_scale_avail(struct device * dev,struct device_attribute * attr,char * buf)508 static ssize_t bma180_show_scale_avail(struct device *dev,
509 struct device_attribute *attr, char *buf)
510 {
511 struct bma180_data *data = iio_priv(dev_to_iio_dev(dev));
512
513 return bma180_show_avail(buf, data->part_info->scale_table,
514 data->part_info->num_scales, true);
515 }
516
517 static IIO_DEVICE_ATTR(in_accel_filter_low_pass_3db_frequency_available,
518 S_IRUGO, bma180_show_filter_freq_avail, NULL, 0);
519
520 static IIO_DEVICE_ATTR(in_accel_scale_available,
521 S_IRUGO, bma180_show_scale_avail, NULL, 0);
522
523 static struct attribute *bma180_attributes[] = {
524 &iio_dev_attr_in_accel_filter_low_pass_3db_frequency_available.
525 dev_attr.attr,
526 &iio_dev_attr_in_accel_scale_available.dev_attr.attr,
527 NULL,
528 };
529
530 static const struct attribute_group bma180_attrs_group = {
531 .attrs = bma180_attributes,
532 };
533
bma180_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)534 static int bma180_read_raw(struct iio_dev *indio_dev,
535 struct iio_chan_spec const *chan, int *val, int *val2,
536 long mask)
537 {
538 struct bma180_data *data = iio_priv(indio_dev);
539 int ret;
540
541 switch (mask) {
542 case IIO_CHAN_INFO_RAW:
543 if (!iio_device_claim_direct(indio_dev))
544 return -EBUSY;
545
546 mutex_lock(&data->mutex);
547 ret = bma180_get_data_reg(data, chan->scan_index);
548 mutex_unlock(&data->mutex);
549 iio_device_release_direct(indio_dev);
550 if (ret < 0)
551 return ret;
552 if (chan->scan_type.sign == 's') {
553 *val = sign_extend32(ret >> chan->scan_type.shift,
554 chan->scan_type.realbits - 1);
555 } else {
556 *val = ret;
557 }
558 return IIO_VAL_INT;
559 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
560 *val = data->bw;
561 return IIO_VAL_INT;
562 case IIO_CHAN_INFO_SCALE:
563 switch (chan->type) {
564 case IIO_ACCEL:
565 *val = 0;
566 *val2 = data->scale;
567 return IIO_VAL_INT_PLUS_MICRO;
568 case IIO_TEMP:
569 *val = 500;
570 return IIO_VAL_INT;
571 default:
572 return -EINVAL;
573 }
574 case IIO_CHAN_INFO_OFFSET:
575 *val = data->part_info->temp_offset;
576 return IIO_VAL_INT;
577 default:
578 return -EINVAL;
579 }
580 }
581
bma180_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)582 static int bma180_write_raw(struct iio_dev *indio_dev,
583 struct iio_chan_spec const *chan, int val, int val2, long mask)
584 {
585 struct bma180_data *data = iio_priv(indio_dev);
586 int ret;
587
588 switch (mask) {
589 case IIO_CHAN_INFO_SCALE:
590 if (val)
591 return -EINVAL;
592 mutex_lock(&data->mutex);
593 ret = bma180_set_scale(data, val2);
594 mutex_unlock(&data->mutex);
595 return ret;
596 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
597 if (val2)
598 return -EINVAL;
599 mutex_lock(&data->mutex);
600 ret = bma180_set_bw(data, val);
601 mutex_unlock(&data->mutex);
602 return ret;
603 default:
604 return -EINVAL;
605 }
606 }
607
608 static const struct iio_info bma180_info = {
609 .attrs = &bma180_attrs_group,
610 .read_raw = bma180_read_raw,
611 .write_raw = bma180_write_raw,
612 };
613
614 static const char * const bma180_power_modes[] = { "low_noise", "low_power" };
615
bma180_get_power_mode(struct iio_dev * indio_dev,const struct iio_chan_spec * chan)616 static int bma180_get_power_mode(struct iio_dev *indio_dev,
617 const struct iio_chan_spec *chan)
618 {
619 struct bma180_data *data = iio_priv(indio_dev);
620
621 return data->pmode;
622 }
623
bma180_set_power_mode(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,unsigned int mode)624 static int bma180_set_power_mode(struct iio_dev *indio_dev,
625 const struct iio_chan_spec *chan, unsigned int mode)
626 {
627 struct bma180_data *data = iio_priv(indio_dev);
628 int ret;
629
630 mutex_lock(&data->mutex);
631 ret = bma180_set_pmode(data, mode);
632 mutex_unlock(&data->mutex);
633
634 return ret;
635 }
636
637 static const struct iio_mount_matrix *
bma180_accel_get_mount_matrix(const struct iio_dev * indio_dev,const struct iio_chan_spec * chan)638 bma180_accel_get_mount_matrix(const struct iio_dev *indio_dev,
639 const struct iio_chan_spec *chan)
640 {
641 struct bma180_data *data = iio_priv(indio_dev);
642
643 return &data->orientation;
644 }
645
646 static const struct iio_enum bma180_power_mode_enum = {
647 .items = bma180_power_modes,
648 .num_items = ARRAY_SIZE(bma180_power_modes),
649 .get = bma180_get_power_mode,
650 .set = bma180_set_power_mode,
651 };
652
653 static const struct iio_chan_spec_ext_info bma023_ext_info[] = {
654 IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, bma180_accel_get_mount_matrix),
655 { }
656 };
657
658 static const struct iio_chan_spec_ext_info bma180_ext_info[] = {
659 IIO_ENUM("power_mode", IIO_SHARED_BY_TYPE, &bma180_power_mode_enum),
660 IIO_ENUM_AVAILABLE("power_mode", IIO_SHARED_BY_TYPE, &bma180_power_mode_enum),
661 IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, bma180_accel_get_mount_matrix),
662 { }
663 };
664
665 #define BMA023_ACC_CHANNEL(_axis, _bits) { \
666 .type = IIO_ACCEL, \
667 .modified = 1, \
668 .channel2 = IIO_MOD_##_axis, \
669 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
670 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
671 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \
672 .scan_index = AXIS_##_axis, \
673 .scan_type = { \
674 .sign = 's', \
675 .realbits = _bits, \
676 .storagebits = 16, \
677 .shift = 16 - _bits, \
678 }, \
679 .ext_info = bma023_ext_info, \
680 }
681
682 #define BMA150_TEMP_CHANNEL { \
683 .type = IIO_TEMP, \
684 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
685 BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OFFSET), \
686 .scan_index = TEMP, \
687 .scan_type = { \
688 .sign = 'u', \
689 .realbits = 8, \
690 .storagebits = 16, \
691 }, \
692 }
693
694 #define BMA180_ACC_CHANNEL(_axis, _bits) { \
695 .type = IIO_ACCEL, \
696 .modified = 1, \
697 .channel2 = IIO_MOD_##_axis, \
698 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
699 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
700 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \
701 .scan_index = AXIS_##_axis, \
702 .scan_type = { \
703 .sign = 's', \
704 .realbits = _bits, \
705 .storagebits = 16, \
706 .shift = 16 - _bits, \
707 }, \
708 .ext_info = bma180_ext_info, \
709 }
710
711 #define BMA180_TEMP_CHANNEL { \
712 .type = IIO_TEMP, \
713 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
714 BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OFFSET), \
715 .scan_index = TEMP, \
716 .scan_type = { \
717 .sign = 's', \
718 .realbits = 8, \
719 .storagebits = 16, \
720 }, \
721 }
722
723 static const struct iio_chan_spec bma023_channels[] = {
724 BMA023_ACC_CHANNEL(X, 10),
725 BMA023_ACC_CHANNEL(Y, 10),
726 BMA023_ACC_CHANNEL(Z, 10),
727 IIO_CHAN_SOFT_TIMESTAMP(4),
728 };
729
730 static const struct iio_chan_spec bma150_channels[] = {
731 BMA023_ACC_CHANNEL(X, 10),
732 BMA023_ACC_CHANNEL(Y, 10),
733 BMA023_ACC_CHANNEL(Z, 10),
734 BMA150_TEMP_CHANNEL,
735 IIO_CHAN_SOFT_TIMESTAMP(4),
736 };
737
738 static const struct iio_chan_spec bma180_channels[] = {
739 BMA180_ACC_CHANNEL(X, 14),
740 BMA180_ACC_CHANNEL(Y, 14),
741 BMA180_ACC_CHANNEL(Z, 14),
742 BMA180_TEMP_CHANNEL,
743 IIO_CHAN_SOFT_TIMESTAMP(4),
744 };
745
746 static const struct iio_chan_spec bma250_channels[] = {
747 BMA180_ACC_CHANNEL(X, 10),
748 BMA180_ACC_CHANNEL(Y, 10),
749 BMA180_ACC_CHANNEL(Z, 10),
750 BMA180_TEMP_CHANNEL,
751 IIO_CHAN_SOFT_TIMESTAMP(4),
752 };
753
754 static const struct bma180_part_info bma180_part_info[] = {
755 [BMA023] = {
756 .chip_id = BMA023_ID_REG_VAL,
757 .channels = bma023_channels,
758 .num_channels = ARRAY_SIZE(bma023_channels),
759 .scale_table = bma023_scale_table,
760 .num_scales = ARRAY_SIZE(bma023_scale_table),
761 .bw_table = bma023_bw_table,
762 .num_bw = ARRAY_SIZE(bma023_bw_table),
763 /* No temperature channel */
764 .temp_offset = 0,
765 .int_reset_reg = BMA023_CTRL_REG0,
766 .int_reset_mask = BMA023_INT_RESET_MASK,
767 .sleep_reg = BMA023_CTRL_REG0,
768 .sleep_mask = BMA023_SLEEP,
769 .bw_reg = BMA023_CTRL_REG2,
770 .bw_mask = BMA023_BW_MASK,
771 .scale_reg = BMA023_CTRL_REG2,
772 .scale_mask = BMA023_RANGE_MASK,
773 /* No power mode on bma023 */
774 .power_reg = 0,
775 .power_mask = 0,
776 .lowpower_val = 0,
777 .int_enable_reg = BMA023_CTRL_REG3,
778 .int_enable_mask = BMA023_NEW_DATA_INT,
779 .softreset_reg = BMA023_CTRL_REG0,
780 .softreset_val = BMA023_RESET_VAL,
781 .chip_config = bma023_chip_config,
782 .chip_disable = bma023_chip_disable,
783 },
784 [BMA150] = {
785 .chip_id = BMA023_ID_REG_VAL,
786 .channels = bma150_channels,
787 .num_channels = ARRAY_SIZE(bma150_channels),
788 .scale_table = bma023_scale_table,
789 .num_scales = ARRAY_SIZE(bma023_scale_table),
790 .bw_table = bma023_bw_table,
791 .num_bw = ARRAY_SIZE(bma023_bw_table),
792 .temp_offset = -60, /* 0 LSB @ -30 degree C */
793 .int_reset_reg = BMA023_CTRL_REG0,
794 .int_reset_mask = BMA023_INT_RESET_MASK,
795 .sleep_reg = BMA023_CTRL_REG0,
796 .sleep_mask = BMA023_SLEEP,
797 .bw_reg = BMA023_CTRL_REG2,
798 .bw_mask = BMA023_BW_MASK,
799 .scale_reg = BMA023_CTRL_REG2,
800 .scale_mask = BMA023_RANGE_MASK,
801 /* No power mode on bma150 */
802 .power_reg = 0,
803 .power_mask = 0,
804 .lowpower_val = 0,
805 .int_enable_reg = BMA023_CTRL_REG3,
806 .int_enable_mask = BMA023_NEW_DATA_INT,
807 .softreset_reg = BMA023_CTRL_REG0,
808 .softreset_val = BMA023_RESET_VAL,
809 .chip_config = bma023_chip_config,
810 .chip_disable = bma023_chip_disable,
811 },
812 [BMA180] = {
813 .chip_id = BMA180_ID_REG_VAL,
814 .channels = bma180_channels,
815 .num_channels = ARRAY_SIZE(bma180_channels),
816 .scale_table = bma180_scale_table,
817 .num_scales = ARRAY_SIZE(bma180_scale_table),
818 .bw_table = bma180_bw_table,
819 .num_bw = ARRAY_SIZE(bma180_bw_table),
820 .temp_offset = 48, /* 0 LSB @ 24 degree C */
821 .int_reset_reg = BMA180_CTRL_REG0,
822 .int_reset_mask = BMA180_RESET_INT,
823 .sleep_reg = BMA180_CTRL_REG0,
824 .sleep_mask = BMA180_SLEEP,
825 .bw_reg = BMA180_BW_TCS,
826 .bw_mask = BMA180_BW,
827 .scale_reg = BMA180_OFFSET_LSB1,
828 .scale_mask = BMA180_RANGE,
829 .power_reg = BMA180_TCO_Z,
830 .power_mask = BMA180_MODE_CONFIG,
831 .lowpower_val = BMA180_LOW_POWER,
832 .int_enable_reg = BMA180_CTRL_REG3,
833 .int_enable_mask = BMA180_NEW_DATA_INT,
834 .softreset_reg = BMA180_RESET,
835 .softreset_val = BMA180_RESET_VAL,
836 .chip_config = bma180_chip_config,
837 .chip_disable = bma180_chip_disable,
838 },
839 [BMA250] = {
840 .chip_id = BMA250_ID_REG_VAL,
841 .channels = bma250_channels,
842 .num_channels = ARRAY_SIZE(bma250_channels),
843 .scale_table = bma250_scale_table,
844 .num_scales = ARRAY_SIZE(bma250_scale_table),
845 .bw_table = bma250_bw_table,
846 .num_bw = ARRAY_SIZE(bma250_bw_table),
847 .temp_offset = 48, /* 0 LSB @ 24 degree C */
848 .int_reset_reg = BMA250_INT_RESET_REG,
849 .int_reset_mask = BMA250_INT_RESET_MASK,
850 .sleep_reg = BMA250_POWER_REG,
851 .sleep_mask = BMA250_SUSPEND_MASK,
852 .bw_reg = BMA250_BW_REG,
853 .bw_mask = BMA250_BW_MASK,
854 .bw_offset = BMA250_BW_OFFSET,
855 .scale_reg = BMA250_RANGE_REG,
856 .scale_mask = BMA250_RANGE_MASK,
857 .power_reg = BMA250_POWER_REG,
858 .power_mask = BMA250_LOWPOWER_MASK,
859 .lowpower_val = 1,
860 .int_enable_reg = BMA250_INT_ENABLE_REG,
861 .int_enable_mask = BMA250_DATA_INTEN_MASK,
862 .softreset_reg = BMA250_RESET_REG,
863 .softreset_val = BMA180_RESET_VAL,
864 .chip_config = bma250_chip_config,
865 .chip_disable = bma250_chip_disable,
866 },
867 };
868
bma180_trigger_handler(int irq,void * p)869 static irqreturn_t bma180_trigger_handler(int irq, void *p)
870 {
871 struct iio_poll_func *pf = p;
872 struct iio_dev *indio_dev = pf->indio_dev;
873 struct bma180_data *data = iio_priv(indio_dev);
874 s64 time_ns = iio_get_time_ns(indio_dev);
875 int bit, ret, i = 0;
876
877 mutex_lock(&data->mutex);
878
879 iio_for_each_active_channel(indio_dev, bit) {
880 ret = bma180_get_data_reg(data, bit);
881 if (ret < 0) {
882 mutex_unlock(&data->mutex);
883 goto err;
884 }
885 data->scan.chan[i++] = ret;
886 }
887
888 mutex_unlock(&data->mutex);
889
890 iio_push_to_buffers_with_ts(indio_dev, &data->scan, sizeof(data->scan), time_ns);
891 err:
892 iio_trigger_notify_done(indio_dev->trig);
893
894 return IRQ_HANDLED;
895 }
896
bma180_data_rdy_trigger_set_state(struct iio_trigger * trig,bool state)897 static int bma180_data_rdy_trigger_set_state(struct iio_trigger *trig,
898 bool state)
899 {
900 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
901 struct bma180_data *data = iio_priv(indio_dev);
902
903 return bma180_set_new_data_intr_state(data, state);
904 }
905
bma180_trig_reen(struct iio_trigger * trig)906 static void bma180_trig_reen(struct iio_trigger *trig)
907 {
908 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
909 struct bma180_data *data = iio_priv(indio_dev);
910 int ret;
911
912 ret = bma180_reset_intr(data);
913 if (ret)
914 dev_err(&data->client->dev, "failed to reset interrupt\n");
915 }
916
917 static const struct iio_trigger_ops bma180_trigger_ops = {
918 .set_trigger_state = bma180_data_rdy_trigger_set_state,
919 .reenable = bma180_trig_reen,
920 };
921
bma180_probe(struct i2c_client * client)922 static int bma180_probe(struct i2c_client *client)
923 {
924 const struct i2c_device_id *id = i2c_client_get_device_id(client);
925 struct device *dev = &client->dev;
926 struct bma180_data *data;
927 struct iio_dev *indio_dev;
928 int ret;
929
930 indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
931 if (!indio_dev)
932 return -ENOMEM;
933
934 data = iio_priv(indio_dev);
935 i2c_set_clientdata(client, indio_dev);
936 data->client = client;
937 data->part_info = i2c_get_match_data(client);
938
939 ret = iio_read_mount_matrix(dev, &data->orientation);
940 if (ret)
941 return ret;
942
943 data->vdd_supply = devm_regulator_get(dev, "vdd");
944 if (IS_ERR(data->vdd_supply))
945 return dev_err_probe(dev, PTR_ERR(data->vdd_supply),
946 "Failed to get vdd regulator\n");
947
948 data->vddio_supply = devm_regulator_get(dev, "vddio");
949 if (IS_ERR(data->vddio_supply))
950 return dev_err_probe(dev, PTR_ERR(data->vddio_supply),
951 "Failed to get vddio regulator\n");
952
953 /* Typical voltage 2.4V these are min and max */
954 ret = regulator_set_voltage(data->vdd_supply, 1620000, 3600000);
955 if (ret)
956 return ret;
957 ret = regulator_set_voltage(data->vddio_supply, 1200000, 3600000);
958 if (ret)
959 return ret;
960 ret = regulator_enable(data->vdd_supply);
961 if (ret) {
962 dev_err(dev, "Failed to enable vdd regulator: %d\n", ret);
963 return ret;
964 }
965 ret = regulator_enable(data->vddio_supply);
966 if (ret) {
967 dev_err(dev, "Failed to enable vddio regulator: %d\n", ret);
968 goto err_disable_vdd;
969 }
970 /* Wait to make sure we started up properly (3 ms at least) */
971 usleep_range(3000, 5000);
972
973 ret = data->part_info->chip_config(data);
974 if (ret < 0)
975 goto err_chip_disable;
976
977 mutex_init(&data->mutex);
978 indio_dev->channels = data->part_info->channels;
979 indio_dev->num_channels = data->part_info->num_channels;
980 indio_dev->name = id->name;
981 indio_dev->modes = INDIO_DIRECT_MODE;
982 indio_dev->info = &bma180_info;
983
984 if (client->irq > 0) {
985 data->trig = iio_trigger_alloc(dev, "%s-dev%d", indio_dev->name,
986 iio_device_id(indio_dev));
987 if (!data->trig) {
988 ret = -ENOMEM;
989 goto err_chip_disable;
990 }
991
992 ret = devm_request_irq(dev, client->irq,
993 iio_trigger_generic_data_rdy_poll, IRQF_TRIGGER_RISING,
994 "bma180_event", data->trig);
995 if (ret) {
996 dev_err(dev, "unable to request IRQ\n");
997 goto err_trigger_free;
998 }
999
1000 data->trig->ops = &bma180_trigger_ops;
1001 iio_trigger_set_drvdata(data->trig, indio_dev);
1002
1003 ret = iio_trigger_register(data->trig);
1004 if (ret)
1005 goto err_trigger_free;
1006
1007 indio_dev->trig = iio_trigger_get(data->trig);
1008 }
1009
1010 ret = iio_triggered_buffer_setup(indio_dev, NULL,
1011 bma180_trigger_handler, NULL);
1012 if (ret < 0) {
1013 dev_err(dev, "unable to setup iio triggered buffer\n");
1014 goto err_trigger_unregister;
1015 }
1016
1017 ret = iio_device_register(indio_dev);
1018 if (ret < 0) {
1019 dev_err(dev, "unable to register iio device\n");
1020 goto err_buffer_cleanup;
1021 }
1022
1023 return 0;
1024
1025 err_buffer_cleanup:
1026 iio_triggered_buffer_cleanup(indio_dev);
1027 err_trigger_unregister:
1028 if (data->trig)
1029 iio_trigger_unregister(data->trig);
1030 err_trigger_free:
1031 iio_trigger_free(data->trig);
1032 err_chip_disable:
1033 data->part_info->chip_disable(data);
1034 regulator_disable(data->vddio_supply);
1035 err_disable_vdd:
1036 regulator_disable(data->vdd_supply);
1037
1038 return ret;
1039 }
1040
bma180_remove(struct i2c_client * client)1041 static void bma180_remove(struct i2c_client *client)
1042 {
1043 struct iio_dev *indio_dev = i2c_get_clientdata(client);
1044 struct bma180_data *data = iio_priv(indio_dev);
1045
1046 iio_device_unregister(indio_dev);
1047 iio_triggered_buffer_cleanup(indio_dev);
1048 if (data->trig) {
1049 iio_trigger_unregister(data->trig);
1050 iio_trigger_free(data->trig);
1051 }
1052
1053 mutex_lock(&data->mutex);
1054 data->part_info->chip_disable(data);
1055 mutex_unlock(&data->mutex);
1056 regulator_disable(data->vddio_supply);
1057 regulator_disable(data->vdd_supply);
1058 }
1059
bma180_suspend(struct device * dev)1060 static int bma180_suspend(struct device *dev)
1061 {
1062 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1063 struct bma180_data *data = iio_priv(indio_dev);
1064 int ret;
1065
1066 mutex_lock(&data->mutex);
1067 ret = bma180_set_sleep_state(data, true);
1068 mutex_unlock(&data->mutex);
1069
1070 return ret;
1071 }
1072
bma180_resume(struct device * dev)1073 static int bma180_resume(struct device *dev)
1074 {
1075 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1076 struct bma180_data *data = iio_priv(indio_dev);
1077 int ret;
1078
1079 mutex_lock(&data->mutex);
1080 ret = bma180_set_sleep_state(data, false);
1081 mutex_unlock(&data->mutex);
1082
1083 return ret;
1084 }
1085
1086 static DEFINE_SIMPLE_DEV_PM_OPS(bma180_pm_ops, bma180_suspend, bma180_resume);
1087
1088 static const struct i2c_device_id bma180_ids[] = {
1089 { "bma023", (kernel_ulong_t)&bma180_part_info[BMA023] },
1090 { "bma150", (kernel_ulong_t)&bma180_part_info[BMA150] },
1091 { "bma180", (kernel_ulong_t)&bma180_part_info[BMA180] },
1092 { "bma250", (kernel_ulong_t)&bma180_part_info[BMA250] },
1093 { "smb380", (kernel_ulong_t)&bma180_part_info[BMA150] },
1094 { }
1095 };
1096
1097 MODULE_DEVICE_TABLE(i2c, bma180_ids);
1098
1099 static const struct of_device_id bma180_of_match[] = {
1100 {
1101 .compatible = "bosch,bma023",
1102 .data = &bma180_part_info[BMA023]
1103 },
1104 {
1105 .compatible = "bosch,bma150",
1106 .data = &bma180_part_info[BMA150]
1107 },
1108 {
1109 .compatible = "bosch,bma180",
1110 .data = &bma180_part_info[BMA180]
1111 },
1112 {
1113 .compatible = "bosch,bma250",
1114 .data = &bma180_part_info[BMA250]
1115 },
1116 {
1117 .compatible = "bosch,smb380",
1118 .data = &bma180_part_info[BMA150]
1119 },
1120 { }
1121 };
1122 MODULE_DEVICE_TABLE(of, bma180_of_match);
1123
1124 static struct i2c_driver bma180_driver = {
1125 .driver = {
1126 .name = "bma180",
1127 .pm = pm_sleep_ptr(&bma180_pm_ops),
1128 .of_match_table = bma180_of_match,
1129 },
1130 .probe = bma180_probe,
1131 .remove = bma180_remove,
1132 .id_table = bma180_ids,
1133 };
1134
1135 module_i2c_driver(bma180_driver);
1136
1137 MODULE_AUTHOR("Kravchenko Oleksandr <x0199363@ti.com>");
1138 MODULE_AUTHOR("Texas Instruments, Inc.");
1139 MODULE_DESCRIPTION("Bosch BMA023/BMA1x0/BMA250 triaxial acceleration sensor");
1140 MODULE_LICENSE("GPL");
1141