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1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Core IIO driver for Bosch BMA400 triaxial acceleration sensor.
4  *
5  * Copyright 2019 Dan Robertson <[email protected]>
6  *
7  * TODO:
8  *  - Support for power management
9  *  - Support events and interrupts
10  *  - Create channel for step count
11  *  - Create channel for sensor time
12  */
13
14 #include <linux/bitfield.h>
15 #include <linux/bitops.h>
16 #include <linux/device.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/mutex.h>
20 #include <linux/regmap.h>
21 #include <linux/regulator/consumer.h>
22 #include <linux/slab.h>
23
24 #include <asm/unaligned.h>
25
26 #include <linux/iio/iio.h>
27 #include <linux/iio/buffer.h>
28 #include <linux/iio/events.h>
29 #include <linux/iio/sysfs.h>
30 #include <linux/iio/trigger.h>
31 #include <linux/iio/trigger_consumer.h>
32 #include <linux/iio/triggered_buffer.h>
33
34 #include "bma400.h"
35
36 /*
37  * The G-range selection may be one of 2g, 4g, 8, or 16g. The scale may
38  * be selected with the acc_range bits of the ACC_CONFIG1 register.
39  * NB: This buffer is populated in the device init.
40  */
41 static int bma400_scales[8];
42
43 /*
44  * See the ACC_CONFIG1 section of the datasheet.
45  * NB: This buffer is populated in the device init.
46  */
47 static int bma400_sample_freqs[14];
48
49 static const int bma400_osr_range[] = { 0, 1, 3 };
50
51 static int tap_reset_timeout[BMA400_TAP_TIM_LIST_LEN] = {
52         300000,
53         400000,
54         500000,
55         600000
56 };
57
58 static int tap_max2min_time[BMA400_TAP_TIM_LIST_LEN] = {
59         30000,
60         45000,
61         60000,
62         90000
63 };
64
65 static int double_tap2_min_delay[BMA400_TAP_TIM_LIST_LEN] = {
66         20000,
67         40000,
68         60000,
69         80000
70 };
71
72 /* See the ACC_CONFIG0 section of the datasheet */
73 enum bma400_power_mode {
74         POWER_MODE_SLEEP   = 0x00,
75         POWER_MODE_LOW     = 0x01,
76         POWER_MODE_NORMAL  = 0x02,
77         POWER_MODE_INVALID = 0x03,
78 };
79
80 enum bma400_scan {
81         BMA400_ACCL_X,
82         BMA400_ACCL_Y,
83         BMA400_ACCL_Z,
84         BMA400_TEMP,
85 };
86
87 struct bma400_sample_freq {
88         int hz;
89         int uhz;
90 };
91
92 enum bma400_activity {
93         BMA400_STILL,
94         BMA400_WALKING,
95         BMA400_RUNNING,
96 };
97
98 struct bma400_data {
99         struct device *dev;
100         struct regmap *regmap;
101         struct mutex mutex; /* data register lock */
102         struct iio_mount_matrix orientation;
103         enum bma400_power_mode power_mode;
104         struct bma400_sample_freq sample_freq;
105         int oversampling_ratio;
106         int scale;
107         struct iio_trigger *trig;
108         int steps_enabled;
109         bool step_event_en;
110         bool activity_event_en;
111         unsigned int generic_event_en;
112         unsigned int tap_event_en_bitmask;
113         /* Correct time stamp alignment */
114         struct {
115                 __le16 buff[3];
116                 u8 temperature;
117                 s64 ts __aligned(8);
118         } buffer __aligned(IIO_DMA_MINALIGN);
119         __le16 status;
120         __be16 duration;
121 };
122
123 static bool bma400_is_writable_reg(struct device *dev, unsigned int reg)
124 {
125         switch (reg) {
126         case BMA400_CHIP_ID_REG:
127         case BMA400_ERR_REG:
128         case BMA400_STATUS_REG:
129         case BMA400_X_AXIS_LSB_REG:
130         case BMA400_X_AXIS_MSB_REG:
131         case BMA400_Y_AXIS_LSB_REG:
132         case BMA400_Y_AXIS_MSB_REG:
133         case BMA400_Z_AXIS_LSB_REG:
134         case BMA400_Z_AXIS_MSB_REG:
135         case BMA400_SENSOR_TIME0:
136         case BMA400_SENSOR_TIME1:
137         case BMA400_SENSOR_TIME2:
138         case BMA400_EVENT_REG:
139         case BMA400_INT_STAT0_REG:
140         case BMA400_INT_STAT1_REG:
141         case BMA400_INT_STAT2_REG:
142         case BMA400_TEMP_DATA_REG:
143         case BMA400_FIFO_LENGTH0_REG:
144         case BMA400_FIFO_LENGTH1_REG:
145         case BMA400_FIFO_DATA_REG:
146         case BMA400_STEP_CNT0_REG:
147         case BMA400_STEP_CNT1_REG:
148         case BMA400_STEP_CNT3_REG:
149         case BMA400_STEP_STAT_REG:
150                 return false;
151         default:
152                 return true;
153         }
154 }
155
156 static bool bma400_is_volatile_reg(struct device *dev, unsigned int reg)
157 {
158         switch (reg) {
159         case BMA400_ERR_REG:
160         case BMA400_STATUS_REG:
161         case BMA400_X_AXIS_LSB_REG:
162         case BMA400_X_AXIS_MSB_REG:
163         case BMA400_Y_AXIS_LSB_REG:
164         case BMA400_Y_AXIS_MSB_REG:
165         case BMA400_Z_AXIS_LSB_REG:
166         case BMA400_Z_AXIS_MSB_REG:
167         case BMA400_SENSOR_TIME0:
168         case BMA400_SENSOR_TIME1:
169         case BMA400_SENSOR_TIME2:
170         case BMA400_EVENT_REG:
171         case BMA400_INT_STAT0_REG:
172         case BMA400_INT_STAT1_REG:
173         case BMA400_INT_STAT2_REG:
174         case BMA400_TEMP_DATA_REG:
175         case BMA400_FIFO_LENGTH0_REG:
176         case BMA400_FIFO_LENGTH1_REG:
177         case BMA400_FIFO_DATA_REG:
178         case BMA400_STEP_CNT0_REG:
179         case BMA400_STEP_CNT1_REG:
180         case BMA400_STEP_CNT3_REG:
181         case BMA400_STEP_STAT_REG:
182                 return true;
183         default:
184                 return false;
185         }
186 }
187
188 const struct regmap_config bma400_regmap_config = {
189         .reg_bits = 8,
190         .val_bits = 8,
191         .max_register = BMA400_CMD_REG,
192         .cache_type = REGCACHE_RBTREE,
193         .writeable_reg = bma400_is_writable_reg,
194         .volatile_reg = bma400_is_volatile_reg,
195 };
196 EXPORT_SYMBOL_NS(bma400_regmap_config, IIO_BMA400);
197
198 static const struct iio_mount_matrix *
199 bma400_accel_get_mount_matrix(const struct iio_dev *indio_dev,
200                               const struct iio_chan_spec *chan)
201 {
202         struct bma400_data *data = iio_priv(indio_dev);
203
204         return &data->orientation;
205 }
206
207 static const struct iio_chan_spec_ext_info bma400_ext_info[] = {
208         IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, bma400_accel_get_mount_matrix),
209         { }
210 };
211
212 static const struct iio_event_spec bma400_step_detect_event = {
213         .type = IIO_EV_TYPE_CHANGE,
214         .dir = IIO_EV_DIR_NONE,
215         .mask_separate = BIT(IIO_EV_INFO_ENABLE),
216 };
217
218 static const struct iio_event_spec bma400_activity_event = {
219         .type = IIO_EV_TYPE_CHANGE,
220         .dir = IIO_EV_DIR_NONE,
221         .mask_shared_by_type = BIT(IIO_EV_INFO_ENABLE),
222 };
223
224 static const struct iio_event_spec bma400_accel_event[] = {
225         {
226                 .type = IIO_EV_TYPE_MAG,
227                 .dir = IIO_EV_DIR_FALLING,
228                 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
229                                        BIT(IIO_EV_INFO_PERIOD) |
230                                        BIT(IIO_EV_INFO_HYSTERESIS) |
231                                        BIT(IIO_EV_INFO_ENABLE),
232         },
233         {
234                 .type = IIO_EV_TYPE_MAG,
235                 .dir = IIO_EV_DIR_RISING,
236                 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
237                                        BIT(IIO_EV_INFO_PERIOD) |
238                                        BIT(IIO_EV_INFO_HYSTERESIS) |
239                                        BIT(IIO_EV_INFO_ENABLE),
240         },
241         {
242                 .type = IIO_EV_TYPE_GESTURE,
243                 .dir = IIO_EV_DIR_SINGLETAP,
244                 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
245                                        BIT(IIO_EV_INFO_ENABLE) |
246                                        BIT(IIO_EV_INFO_RESET_TIMEOUT),
247         },
248         {
249                 .type = IIO_EV_TYPE_GESTURE,
250                 .dir = IIO_EV_DIR_DOUBLETAP,
251                 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
252                                        BIT(IIO_EV_INFO_ENABLE) |
253                                        BIT(IIO_EV_INFO_RESET_TIMEOUT) |
254                                        BIT(IIO_EV_INFO_TAP2_MIN_DELAY),
255         },
256 };
257
258 static int usec_to_tapreg_raw(int usec, const int *time_list)
259 {
260         int index;
261
262         for (index = 0; index < BMA400_TAP_TIM_LIST_LEN; index++) {
263                 if (usec == time_list[index])
264                         return index;
265         }
266         return -EINVAL;
267 }
268
269 static ssize_t in_accel_gesture_tap_maxtomin_time_show(struct device *dev,
270                                                        struct device_attribute *attr,
271                                                        char *buf)
272 {
273         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
274         struct bma400_data *data = iio_priv(indio_dev);
275         int ret, reg_val, raw, vals[2];
276
277         ret = regmap_read(data->regmap, BMA400_TAP_CONFIG1, &reg_val);
278         if (ret)
279                 return ret;
280
281         raw = FIELD_GET(BMA400_TAP_TICSTH_MSK, reg_val);
282         vals[0] = 0;
283         vals[1] = tap_max2min_time[raw];
284
285         return iio_format_value(buf, IIO_VAL_INT_PLUS_MICRO, 2, vals);
286 }
287
288 static ssize_t in_accel_gesture_tap_maxtomin_time_store(struct device *dev,
289                                                         struct device_attribute *attr,
290                                                         const char *buf, size_t len)
291 {
292         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
293         struct bma400_data *data = iio_priv(indio_dev);
294         int ret, val_int, val_fract, raw;
295
296         ret = iio_str_to_fixpoint(buf, 100000, &val_int, &val_fract);
297         if (ret)
298                 return ret;
299
300         raw = usec_to_tapreg_raw(val_fract, tap_max2min_time);
301         if (raw < 0)
302                 return -EINVAL;
303
304         ret = regmap_update_bits(data->regmap, BMA400_TAP_CONFIG1,
305                                  BMA400_TAP_TICSTH_MSK,
306                                  FIELD_PREP(BMA400_TAP_TICSTH_MSK, raw));
307         if (ret)
308                 return ret;
309
310         return len;
311 }
312
313 static IIO_DEVICE_ATTR_RW(in_accel_gesture_tap_maxtomin_time, 0);
314
315 /*
316  * Tap interrupts works with 200 Hz input data rate and the time based tap
317  * controls are in the terms of data samples so the below calculation is
318  * used to convert the configuration values into seconds.
319  * e.g.:
320  * 60 data samples * 0.005 ms = 0.3 seconds.
321  * 80 data samples * 0.005 ms = 0.4 seconds.
322  */
323
324 /* quiet configuration values in seconds */
325 static IIO_CONST_ATTR(in_accel_gesture_tap_reset_timeout_available,
326                       "0.3 0.4 0.5 0.6");
327
328 /* tics_th configuration values in seconds */
329 static IIO_CONST_ATTR(in_accel_gesture_tap_maxtomin_time_available,
330                       "0.03 0.045 0.06 0.09");
331
332 /* quiet_dt configuration values in seconds */
333 static IIO_CONST_ATTR(in_accel_gesture_doubletap_tap2_min_delay_available,
334                       "0.02 0.04 0.06 0.08");
335
336 /* List of sensitivity values available to configure tap interrupts */
337 static IIO_CONST_ATTR(in_accel_gesture_tap_value_available, "0 1 2 3 4 5 6 7");
338
339 static struct attribute *bma400_event_attributes[] = {
340         &iio_const_attr_in_accel_gesture_tap_value_available.dev_attr.attr,
341         &iio_const_attr_in_accel_gesture_tap_reset_timeout_available.dev_attr.attr,
342         &iio_const_attr_in_accel_gesture_tap_maxtomin_time_available.dev_attr.attr,
343         &iio_const_attr_in_accel_gesture_doubletap_tap2_min_delay_available.dev_attr.attr,
344         &iio_dev_attr_in_accel_gesture_tap_maxtomin_time.dev_attr.attr,
345         NULL
346 };
347
348 static const struct attribute_group bma400_event_attribute_group = {
349         .attrs = bma400_event_attributes,
350 };
351
352 #define BMA400_ACC_CHANNEL(_index, _axis) { \
353         .type = IIO_ACCEL, \
354         .modified = 1, \
355         .channel2 = IIO_MOD_##_axis, \
356         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
357         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
358                 BIT(IIO_CHAN_INFO_SCALE) | \
359                 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
360         .info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
361                 BIT(IIO_CHAN_INFO_SCALE) | \
362                 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
363         .ext_info = bma400_ext_info, \
364         .scan_index = _index,   \
365         .scan_type = {          \
366                 .sign = 's',    \
367                 .realbits = 12,         \
368                 .storagebits = 16,      \
369                 .endianness = IIO_LE,   \
370         },                              \
371         .event_spec = bma400_accel_event,                       \
372         .num_event_specs = ARRAY_SIZE(bma400_accel_event)       \
373 }
374
375 #define BMA400_ACTIVITY_CHANNEL(_chan2) {       \
376         .type = IIO_ACTIVITY,                   \
377         .modified = 1,                          \
378         .channel2 = _chan2,                     \
379         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),     \
380         .scan_index = -1, /* No buffer support */               \
381         .event_spec = &bma400_activity_event,                   \
382         .num_event_specs = 1,                                   \
383 }
384
385 static const struct iio_chan_spec bma400_channels[] = {
386         BMA400_ACC_CHANNEL(0, X),
387         BMA400_ACC_CHANNEL(1, Y),
388         BMA400_ACC_CHANNEL(2, Z),
389         {
390                 .type = IIO_TEMP,
391                 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
392                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ),
393                 .scan_index = 3,
394                 .scan_type = {
395                         .sign = 's',
396                         .realbits = 8,
397                         .storagebits = 8,
398                         .endianness = IIO_LE,
399                 },
400         },
401         {
402                 .type = IIO_STEPS,
403                 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
404                                       BIT(IIO_CHAN_INFO_ENABLE),
405                 .scan_index = -1, /* No buffer support */
406                 .event_spec = &bma400_step_detect_event,
407                 .num_event_specs = 1,
408         },
409         BMA400_ACTIVITY_CHANNEL(IIO_MOD_STILL),
410         BMA400_ACTIVITY_CHANNEL(IIO_MOD_WALKING),
411         BMA400_ACTIVITY_CHANNEL(IIO_MOD_RUNNING),
412         IIO_CHAN_SOFT_TIMESTAMP(4),
413 };
414
415 static int bma400_get_temp_reg(struct bma400_data *data, int *val, int *val2)
416 {
417         unsigned int raw_temp;
418         int host_temp;
419         int ret;
420
421         if (data->power_mode == POWER_MODE_SLEEP)
422                 return -EBUSY;
423
424         ret = regmap_read(data->regmap, BMA400_TEMP_DATA_REG, &raw_temp);
425         if (ret)
426                 return ret;
427
428         host_temp = sign_extend32(raw_temp, 7);
429         /*
430          * The formula for the TEMP_DATA register in the datasheet
431          * is: x * 0.5 + 23
432          */
433         *val = (host_temp >> 1) + 23;
434         *val2 = (host_temp & 0x1) * 500000;
435         return IIO_VAL_INT_PLUS_MICRO;
436 }
437
438 static int bma400_get_accel_reg(struct bma400_data *data,
439                                 const struct iio_chan_spec *chan,
440                                 int *val)
441 {
442         __le16 raw_accel;
443         int lsb_reg;
444         int ret;
445
446         if (data->power_mode == POWER_MODE_SLEEP)
447                 return -EBUSY;
448
449         switch (chan->channel2) {
450         case IIO_MOD_X:
451                 lsb_reg = BMA400_X_AXIS_LSB_REG;
452                 break;
453         case IIO_MOD_Y:
454                 lsb_reg = BMA400_Y_AXIS_LSB_REG;
455                 break;
456         case IIO_MOD_Z:
457                 lsb_reg = BMA400_Z_AXIS_LSB_REG;
458                 break;
459         default:
460                 dev_err(data->dev, "invalid axis channel modifier\n");
461                 return -EINVAL;
462         }
463
464         /* bulk read two registers, with the base being the LSB register */
465         ret = regmap_bulk_read(data->regmap, lsb_reg, &raw_accel,
466                                sizeof(raw_accel));
467         if (ret)
468                 return ret;
469
470         *val = sign_extend32(le16_to_cpu(raw_accel), 11);
471         return IIO_VAL_INT;
472 }
473
474 static void bma400_output_data_rate_from_raw(int raw, unsigned int *val,
475                                              unsigned int *val2)
476 {
477         *val = BMA400_ACC_ODR_MAX_HZ >> (BMA400_ACC_ODR_MAX_RAW - raw);
478         if (raw > BMA400_ACC_ODR_MIN_RAW)
479                 *val2 = 0;
480         else
481                 *val2 = 500000;
482 }
483
484 static int bma400_get_accel_output_data_rate(struct bma400_data *data)
485 {
486         unsigned int val;
487         unsigned int odr;
488         int ret;
489
490         switch (data->power_mode) {
491         case POWER_MODE_LOW:
492                 /*
493                  * Runs at a fixed rate in low-power mode. See section 4.3
494                  * in the datasheet.
495                  */
496                 bma400_output_data_rate_from_raw(BMA400_ACC_ODR_LP_RAW,
497                                                  &data->sample_freq.hz,
498                                                  &data->sample_freq.uhz);
499                 return 0;
500         case POWER_MODE_NORMAL:
501                 /*
502                  * In normal mode the ODR can be found in the ACC_CONFIG1
503                  * register.
504                  */
505                 ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, &val);
506                 if (ret)
507                         goto error;
508
509                 odr = val & BMA400_ACC_ODR_MASK;
510                 if (odr < BMA400_ACC_ODR_MIN_RAW ||
511                     odr > BMA400_ACC_ODR_MAX_RAW) {
512                         ret = -EINVAL;
513                         goto error;
514                 }
515
516                 bma400_output_data_rate_from_raw(odr, &data->sample_freq.hz,
517                                                  &data->sample_freq.uhz);
518                 return 0;
519         case POWER_MODE_SLEEP:
520                 data->sample_freq.hz = 0;
521                 data->sample_freq.uhz = 0;
522                 return 0;
523         default:
524                 ret = 0;
525                 goto error;
526         }
527 error:
528         data->sample_freq.hz = -1;
529         data->sample_freq.uhz = -1;
530         return ret;
531 }
532
533 static int bma400_set_accel_output_data_rate(struct bma400_data *data,
534                                              int hz, int uhz)
535 {
536         unsigned int idx;
537         unsigned int odr;
538         unsigned int val;
539         int ret;
540
541         if (hz >= BMA400_ACC_ODR_MIN_WHOLE_HZ) {
542                 if (uhz || hz > BMA400_ACC_ODR_MAX_HZ)
543                         return -EINVAL;
544
545                 /* Note this works because MIN_WHOLE_HZ is odd */
546                 idx = __ffs(hz);
547
548                 if (hz >> idx != BMA400_ACC_ODR_MIN_WHOLE_HZ)
549                         return -EINVAL;
550
551                 idx += BMA400_ACC_ODR_MIN_RAW + 1;
552         } else if (hz == BMA400_ACC_ODR_MIN_HZ && uhz == 500000) {
553                 idx = BMA400_ACC_ODR_MIN_RAW;
554         } else {
555                 return -EINVAL;
556         }
557
558         ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, &val);
559         if (ret)
560                 return ret;
561
562         /* preserve the range and normal mode osr */
563         odr = (~BMA400_ACC_ODR_MASK & val) | idx;
564
565         ret = regmap_write(data->regmap, BMA400_ACC_CONFIG1_REG, odr);
566         if (ret)
567                 return ret;
568
569         bma400_output_data_rate_from_raw(idx, &data->sample_freq.hz,
570                                          &data->sample_freq.uhz);
571         return 0;
572 }
573
574 static int bma400_get_accel_oversampling_ratio(struct bma400_data *data)
575 {
576         unsigned int val;
577         unsigned int osr;
578         int ret;
579
580         /*
581          * The oversampling ratio is stored in a different register
582          * based on the power-mode. In normal mode the OSR is stored
583          * in ACC_CONFIG1. In low-power mode it is stored in
584          * ACC_CONFIG0.
585          */
586         switch (data->power_mode) {
587         case POWER_MODE_LOW:
588                 ret = regmap_read(data->regmap, BMA400_ACC_CONFIG0_REG, &val);
589                 if (ret) {
590                         data->oversampling_ratio = -1;
591                         return ret;
592                 }
593
594                 osr = (val & BMA400_LP_OSR_MASK) >> BMA400_LP_OSR_SHIFT;
595
596                 data->oversampling_ratio = osr;
597                 return 0;
598         case POWER_MODE_NORMAL:
599                 ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, &val);
600                 if (ret) {
601                         data->oversampling_ratio = -1;
602                         return ret;
603                 }
604
605                 osr = (val & BMA400_NP_OSR_MASK) >> BMA400_NP_OSR_SHIFT;
606
607                 data->oversampling_ratio = osr;
608                 return 0;
609         case POWER_MODE_SLEEP:
610                 data->oversampling_ratio = 0;
611                 return 0;
612         default:
613                 data->oversampling_ratio = -1;
614                 return -EINVAL;
615         }
616 }
617
618 static int bma400_set_accel_oversampling_ratio(struct bma400_data *data,
619                                                int val)
620 {
621         unsigned int acc_config;
622         int ret;
623
624         if (val & ~BMA400_TWO_BITS_MASK)
625                 return -EINVAL;
626
627         /*
628          * The oversampling ratio is stored in a different register
629          * based on the power-mode.
630          */
631         switch (data->power_mode) {
632         case POWER_MODE_LOW:
633                 ret = regmap_read(data->regmap, BMA400_ACC_CONFIG0_REG,
634                                   &acc_config);
635                 if (ret)
636                         return ret;
637
638                 ret = regmap_write(data->regmap, BMA400_ACC_CONFIG0_REG,
639                                    (acc_config & ~BMA400_LP_OSR_MASK) |
640                                    (val << BMA400_LP_OSR_SHIFT));
641                 if (ret) {
642                         dev_err(data->dev, "Failed to write out OSR\n");
643                         return ret;
644                 }
645
646                 data->oversampling_ratio = val;
647                 return 0;
648         case POWER_MODE_NORMAL:
649                 ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG,
650                                   &acc_config);
651                 if (ret)
652                         return ret;
653
654                 ret = regmap_write(data->regmap, BMA400_ACC_CONFIG1_REG,
655                                    (acc_config & ~BMA400_NP_OSR_MASK) |
656                                    (val << BMA400_NP_OSR_SHIFT));
657                 if (ret) {
658                         dev_err(data->dev, "Failed to write out OSR\n");
659                         return ret;
660                 }
661
662                 data->oversampling_ratio = val;
663                 return 0;
664         default:
665                 return -EINVAL;
666         }
667         return ret;
668 }
669
670 static int bma400_accel_scale_to_raw(struct bma400_data *data,
671                                      unsigned int val)
672 {
673         int raw;
674
675         if (val == 0)
676                 return -EINVAL;
677
678         /* Note this works because BMA400_SCALE_MIN is odd */
679         raw = __ffs(val);
680
681         if (val >> raw != BMA400_SCALE_MIN)
682                 return -EINVAL;
683
684         return raw;
685 }
686
687 static int bma400_get_accel_scale(struct bma400_data *data)
688 {
689         unsigned int raw_scale;
690         unsigned int val;
691         int ret;
692
693         ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, &val);
694         if (ret)
695                 return ret;
696
697         raw_scale = (val & BMA400_ACC_SCALE_MASK) >> BMA400_SCALE_SHIFT;
698         if (raw_scale > BMA400_TWO_BITS_MASK)
699                 return -EINVAL;
700
701         data->scale = BMA400_SCALE_MIN << raw_scale;
702
703         return 0;
704 }
705
706 static int bma400_set_accel_scale(struct bma400_data *data, unsigned int val)
707 {
708         unsigned int acc_config;
709         int raw;
710         int ret;
711
712         ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, &acc_config);
713         if (ret)
714                 return ret;
715
716         raw = bma400_accel_scale_to_raw(data, val);
717         if (raw < 0)
718                 return raw;
719
720         ret = regmap_write(data->regmap, BMA400_ACC_CONFIG1_REG,
721                            (acc_config & ~BMA400_ACC_SCALE_MASK) |
722                            (raw << BMA400_SCALE_SHIFT));
723         if (ret)
724                 return ret;
725
726         data->scale = val;
727         return 0;
728 }
729
730 static int bma400_get_power_mode(struct bma400_data *data)
731 {
732         unsigned int val;
733         int ret;
734
735         ret = regmap_read(data->regmap, BMA400_STATUS_REG, &val);
736         if (ret) {
737                 dev_err(data->dev, "Failed to read status register\n");
738                 return ret;
739         }
740
741         data->power_mode = (val >> 1) & BMA400_TWO_BITS_MASK;
742         return 0;
743 }
744
745 static int bma400_set_power_mode(struct bma400_data *data,
746                                  enum bma400_power_mode mode)
747 {
748         unsigned int val;
749         int ret;
750
751         ret = regmap_read(data->regmap, BMA400_ACC_CONFIG0_REG, &val);
752         if (ret)
753                 return ret;
754
755         if (data->power_mode == mode)
756                 return 0;
757
758         if (mode == POWER_MODE_INVALID)
759                 return -EINVAL;
760
761         /* Preserve the low-power oversample ratio etc */
762         ret = regmap_write(data->regmap, BMA400_ACC_CONFIG0_REG,
763                            mode | (val & ~BMA400_TWO_BITS_MASK));
764         if (ret) {
765                 dev_err(data->dev, "Failed to write to power-mode\n");
766                 return ret;
767         }
768
769         data->power_mode = mode;
770
771         /*
772          * Update our cached osr and odr based on the new
773          * power-mode.
774          */
775         bma400_get_accel_output_data_rate(data);
776         bma400_get_accel_oversampling_ratio(data);
777         return 0;
778 }
779
780 static int bma400_enable_steps(struct bma400_data *data, int val)
781 {
782         int ret;
783
784         if (data->steps_enabled == val)
785                 return 0;
786
787         ret = regmap_update_bits(data->regmap, BMA400_INT_CONFIG1_REG,
788                                  BMA400_STEP_INT_MSK,
789                                  FIELD_PREP(BMA400_STEP_INT_MSK, val ? 1 : 0));
790         if (ret)
791                 return ret;
792         data->steps_enabled = val;
793         return ret;
794 }
795
796 static int bma400_get_steps_reg(struct bma400_data *data, int *val)
797 {
798         u8 *steps_raw;
799         int ret;
800
801         steps_raw = kmalloc(BMA400_STEP_RAW_LEN, GFP_KERNEL);
802         if (!steps_raw)
803                 return -ENOMEM;
804
805         ret = regmap_bulk_read(data->regmap, BMA400_STEP_CNT0_REG,
806                                steps_raw, BMA400_STEP_RAW_LEN);
807         if (ret) {
808                 kfree(steps_raw);
809                 return ret;
810         }
811         *val = get_unaligned_le24(steps_raw);
812         kfree(steps_raw);
813         return IIO_VAL_INT;
814 }
815
816 static void bma400_init_tables(void)
817 {
818         int raw;
819         int i;
820
821         for (i = 0; i + 1 < ARRAY_SIZE(bma400_sample_freqs); i += 2) {
822                 raw = (i / 2) + 5;
823                 bma400_output_data_rate_from_raw(raw, &bma400_sample_freqs[i],
824                                                  &bma400_sample_freqs[i + 1]);
825         }
826
827         for (i = 0; i + 1 < ARRAY_SIZE(bma400_scales); i += 2) {
828                 raw = i / 2;
829                 bma400_scales[i] = 0;
830                 bma400_scales[i + 1] = BMA400_SCALE_MIN << raw;
831         }
832 }
833
834 static void bma400_power_disable(void *data_ptr)
835 {
836         struct bma400_data *data = data_ptr;
837         int ret;
838
839         mutex_lock(&data->mutex);
840         ret = bma400_set_power_mode(data, POWER_MODE_SLEEP);
841         mutex_unlock(&data->mutex);
842         if (ret)
843                 dev_warn(data->dev, "Failed to put device into sleep mode (%pe)\n",
844                          ERR_PTR(ret));
845 }
846
847 static enum iio_modifier bma400_act_to_mod(enum bma400_activity activity)
848 {
849         switch (activity) {
850         case BMA400_STILL:
851                 return IIO_MOD_STILL;
852         case BMA400_WALKING:
853                 return IIO_MOD_WALKING;
854         case BMA400_RUNNING:
855                 return IIO_MOD_RUNNING;
856         default:
857                 return IIO_NO_MOD;
858         }
859 }
860
861 static int bma400_init(struct bma400_data *data)
862 {
863         static const char * const regulator_names[] = { "vdd", "vddio" };
864         unsigned int val;
865         int ret;
866
867         ret = devm_regulator_bulk_get_enable(data->dev,
868                                              ARRAY_SIZE(regulator_names),
869                                              regulator_names);
870         if (ret)
871                 return dev_err_probe(data->dev, ret, "Failed to get regulators: %d\n",
872                                      ret);
873
874         /* Try to read chip_id register. It must return 0x90. */
875         ret = regmap_read(data->regmap, BMA400_CHIP_ID_REG, &val);
876         if (ret) {
877                 dev_err(data->dev, "Failed to read chip id register\n");
878                 return ret;
879         }
880
881         if (val != BMA400_ID_REG_VAL) {
882                 dev_err(data->dev, "Chip ID mismatch\n");
883                 return -ENODEV;
884         }
885
886         ret = bma400_get_power_mode(data);
887         if (ret) {
888                 dev_err(data->dev, "Failed to get the initial power-mode\n");
889                 return ret;
890         }
891
892         if (data->power_mode != POWER_MODE_NORMAL) {
893                 ret = bma400_set_power_mode(data, POWER_MODE_NORMAL);
894                 if (ret) {
895                         dev_err(data->dev, "Failed to wake up the device\n");
896                         return ret;
897                 }
898                 /*
899                  * TODO: The datasheet waits 1500us here in the example, but
900                  * lists 2/ODR as the wakeup time.
901                  */
902                 usleep_range(1500, 2000);
903         }
904
905         ret = devm_add_action_or_reset(data->dev, bma400_power_disable, data);
906         if (ret)
907                 return ret;
908
909         bma400_init_tables();
910
911         ret = bma400_get_accel_output_data_rate(data);
912         if (ret)
913                 return ret;
914
915         ret = bma400_get_accel_oversampling_ratio(data);
916         if (ret)
917                 return ret;
918
919         ret = bma400_get_accel_scale(data);
920         if (ret)
921                 return ret;
922
923         /* Configure INT1 pin to open drain */
924         ret = regmap_write(data->regmap, BMA400_INT_IO_CTRL_REG, 0x06);
925         if (ret)
926                 return ret;
927         /*
928          * Once the interrupt engine is supported we might use the
929          * data_src_reg, but for now ensure this is set to the
930          * variable ODR filter selectable by the sample frequency
931          * channel.
932          */
933         return regmap_write(data->regmap, BMA400_ACC_CONFIG2_REG, 0x00);
934 }
935
936 static int bma400_read_raw(struct iio_dev *indio_dev,
937                            struct iio_chan_spec const *chan, int *val,
938                            int *val2, long mask)
939 {
940         struct bma400_data *data = iio_priv(indio_dev);
941         unsigned int activity;
942         int ret;
943
944         switch (mask) {
945         case IIO_CHAN_INFO_PROCESSED:
946                 switch (chan->type) {
947                 case IIO_TEMP:
948                         mutex_lock(&data->mutex);
949                         ret = bma400_get_temp_reg(data, val, val2);
950                         mutex_unlock(&data->mutex);
951                         return ret;
952                 case IIO_STEPS:
953                         return bma400_get_steps_reg(data, val);
954                 case IIO_ACTIVITY:
955                         ret = regmap_read(data->regmap, BMA400_STEP_STAT_REG,
956                                           &activity);
957                         if (ret)
958                                 return ret;
959                         /*
960                          * The device does not support confidence value levels,
961                          * so we will always have 100% for current activity and
962                          * 0% for the others.
963                          */
964                         if (chan->channel2 == bma400_act_to_mod(activity))
965                                 *val = 100;
966                         else
967                                 *val = 0;
968                         return IIO_VAL_INT;
969                 default:
970                         return -EINVAL;
971                 }
972         case IIO_CHAN_INFO_RAW:
973                 mutex_lock(&data->mutex);
974                 ret = bma400_get_accel_reg(data, chan, val);
975                 mutex_unlock(&data->mutex);
976                 return ret;
977         case IIO_CHAN_INFO_SAMP_FREQ:
978                 switch (chan->type) {
979                 case IIO_ACCEL:
980                         if (data->sample_freq.hz < 0)
981                                 return -EINVAL;
982
983                         *val = data->sample_freq.hz;
984                         *val2 = data->sample_freq.uhz;
985                         return IIO_VAL_INT_PLUS_MICRO;
986                 case IIO_TEMP:
987                         /*
988                          * Runs at a fixed sampling frequency. See Section 4.4
989                          * of the datasheet.
990                          */
991                         *val = 6;
992                         *val2 = 250000;
993                         return IIO_VAL_INT_PLUS_MICRO;
994                 default:
995                         return -EINVAL;
996                 }
997         case IIO_CHAN_INFO_SCALE:
998                 *val = 0;
999                 *val2 = data->scale;
1000                 return IIO_VAL_INT_PLUS_MICRO;
1001         case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
1002                 /*
1003                  * TODO: We could avoid this logic and returning -EINVAL here if
1004                  * we set both the low-power and normal mode OSR registers when
1005                  * we configure the device.
1006                  */
1007                 if (data->oversampling_ratio < 0)
1008                         return -EINVAL;
1009
1010                 *val = data->oversampling_ratio;
1011                 return IIO_VAL_INT;
1012         case IIO_CHAN_INFO_ENABLE:
1013                 *val = data->steps_enabled;
1014                 return IIO_VAL_INT;
1015         default:
1016                 return -EINVAL;
1017         }
1018 }
1019
1020 static int bma400_read_avail(struct iio_dev *indio_dev,
1021                              struct iio_chan_spec const *chan,
1022                              const int **vals, int *type, int *length,
1023                              long mask)
1024 {
1025         switch (mask) {
1026         case IIO_CHAN_INFO_SCALE:
1027                 *type = IIO_VAL_INT_PLUS_MICRO;
1028                 *vals = bma400_scales;
1029                 *length = ARRAY_SIZE(bma400_scales);
1030                 return IIO_AVAIL_LIST;
1031         case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
1032                 *type = IIO_VAL_INT;
1033                 *vals = bma400_osr_range;
1034                 *length = ARRAY_SIZE(bma400_osr_range);
1035                 return IIO_AVAIL_RANGE;
1036         case IIO_CHAN_INFO_SAMP_FREQ:
1037                 *type = IIO_VAL_INT_PLUS_MICRO;
1038                 *vals = bma400_sample_freqs;
1039                 *length = ARRAY_SIZE(bma400_sample_freqs);
1040                 return IIO_AVAIL_LIST;
1041         default:
1042                 return -EINVAL;
1043         }
1044 }
1045
1046 static int bma400_write_raw(struct iio_dev *indio_dev,
1047                             struct iio_chan_spec const *chan, int val, int val2,
1048                             long mask)
1049 {
1050         struct bma400_data *data = iio_priv(indio_dev);
1051         int ret;
1052
1053         switch (mask) {
1054         case IIO_CHAN_INFO_SAMP_FREQ:
1055                 /*
1056                  * The sample frequency is readonly for the temperature
1057                  * register and a fixed value in low-power mode.
1058                  */
1059                 if (chan->type != IIO_ACCEL)
1060                         return -EINVAL;
1061
1062                 mutex_lock(&data->mutex);
1063                 ret = bma400_set_accel_output_data_rate(data, val, val2);
1064                 mutex_unlock(&data->mutex);
1065                 return ret;
1066         case IIO_CHAN_INFO_SCALE:
1067                 if (val != 0 ||
1068                     val2 < BMA400_SCALE_MIN || val2 > BMA400_SCALE_MAX)
1069                         return -EINVAL;
1070
1071                 mutex_lock(&data->mutex);
1072                 ret = bma400_set_accel_scale(data, val2);
1073                 mutex_unlock(&data->mutex);
1074                 return ret;
1075         case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
1076                 mutex_lock(&data->mutex);
1077                 ret = bma400_set_accel_oversampling_ratio(data, val);
1078                 mutex_unlock(&data->mutex);
1079                 return ret;
1080         case IIO_CHAN_INFO_ENABLE:
1081                 mutex_lock(&data->mutex);
1082                 ret = bma400_enable_steps(data, val);
1083                 mutex_unlock(&data->mutex);
1084                 return ret;
1085         default:
1086                 return -EINVAL;
1087         }
1088 }
1089
1090 static int bma400_write_raw_get_fmt(struct iio_dev *indio_dev,
1091                                     struct iio_chan_spec const *chan,
1092                                     long mask)
1093 {
1094         switch (mask) {
1095         case IIO_CHAN_INFO_SAMP_FREQ:
1096                 return IIO_VAL_INT_PLUS_MICRO;
1097         case IIO_CHAN_INFO_SCALE:
1098                 return IIO_VAL_INT_PLUS_MICRO;
1099         case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
1100                 return IIO_VAL_INT;
1101         case IIO_CHAN_INFO_ENABLE:
1102                 return IIO_VAL_INT;
1103         default:
1104                 return -EINVAL;
1105         }
1106 }
1107
1108 static int bma400_read_event_config(struct iio_dev *indio_dev,
1109                                     const struct iio_chan_spec *chan,
1110                                     enum iio_event_type type,
1111                                     enum iio_event_direction dir)
1112 {
1113         struct bma400_data *data = iio_priv(indio_dev);
1114
1115         switch (chan->type) {
1116         case IIO_ACCEL:
1117                 switch (dir) {
1118                 case IIO_EV_DIR_RISING:
1119                         return FIELD_GET(BMA400_INT_GEN1_MSK,
1120                                          data->generic_event_en);
1121                 case IIO_EV_DIR_FALLING:
1122                         return FIELD_GET(BMA400_INT_GEN2_MSK,
1123                                          data->generic_event_en);
1124                 case IIO_EV_DIR_SINGLETAP:
1125                         return FIELD_GET(BMA400_S_TAP_MSK,
1126                                          data->tap_event_en_bitmask);
1127                 case IIO_EV_DIR_DOUBLETAP:
1128                         return FIELD_GET(BMA400_D_TAP_MSK,
1129                                          data->tap_event_en_bitmask);
1130                 default:
1131                         return -EINVAL;
1132                 }
1133         case IIO_STEPS:
1134                 return data->step_event_en;
1135         case IIO_ACTIVITY:
1136                 return data->activity_event_en;
1137         default:
1138                 return -EINVAL;
1139         }
1140 }
1141
1142 static int bma400_steps_event_enable(struct bma400_data *data, int state)
1143 {
1144         int ret;
1145
1146         ret = bma400_enable_steps(data, 1);
1147         if (ret)
1148                 return ret;
1149
1150         ret = regmap_update_bits(data->regmap, BMA400_INT12_MAP_REG,
1151                                  BMA400_STEP_INT_MSK,
1152                                  FIELD_PREP(BMA400_STEP_INT_MSK,
1153                                             state));
1154         if (ret)
1155                 return ret;
1156         data->step_event_en = state;
1157         return 0;
1158 }
1159
1160 static int bma400_activity_event_en(struct bma400_data *data,
1161                                     enum iio_event_direction dir,
1162                                     int state)
1163 {
1164         int ret, reg, msk, value;
1165         int field_value = 0;
1166
1167         switch (dir) {
1168         case IIO_EV_DIR_RISING:
1169                 reg = BMA400_GEN1INT_CONFIG0;
1170                 msk = BMA400_INT_GEN1_MSK;
1171                 value = 2;
1172                 set_mask_bits(&field_value, BMA400_INT_GEN1_MSK,
1173                               FIELD_PREP(BMA400_INT_GEN1_MSK, state));
1174                 break;
1175         case IIO_EV_DIR_FALLING:
1176                 reg = BMA400_GEN2INT_CONFIG0;
1177                 msk = BMA400_INT_GEN2_MSK;
1178                 value = 0;
1179                 set_mask_bits(&field_value, BMA400_INT_GEN2_MSK,
1180                               FIELD_PREP(BMA400_INT_GEN2_MSK, state));
1181                 break;
1182         default:
1183                 return -EINVAL;
1184         }
1185
1186         /* Enabling all axis for interrupt evaluation */
1187         ret = regmap_write(data->regmap, reg, 0xF8);
1188         if (ret)
1189                 return ret;
1190
1191         /* OR combination of all axis for interrupt evaluation */
1192         ret = regmap_write(data->regmap, reg + BMA400_GEN_CONFIG1_OFF, value);
1193         if (ret)
1194                 return ret;
1195
1196         /* Initial value to avoid interrupts while enabling*/
1197         ret = regmap_write(data->regmap, reg + BMA400_GEN_CONFIG2_OFF, 0x0A);
1198         if (ret)
1199                 return ret;
1200
1201         /* Initial duration value to avoid interrupts while enabling*/
1202         ret = regmap_write(data->regmap, reg + BMA400_GEN_CONFIG31_OFF, 0x0F);
1203         if (ret)
1204                 return ret;
1205
1206         ret = regmap_update_bits(data->regmap, BMA400_INT1_MAP_REG, msk,
1207                                  field_value);
1208         if (ret)
1209                 return ret;
1210
1211         ret = regmap_update_bits(data->regmap, BMA400_INT_CONFIG0_REG, msk,
1212                                  field_value);
1213         if (ret)
1214                 return ret;
1215
1216         set_mask_bits(&data->generic_event_en, msk, field_value);
1217         return 0;
1218 }
1219
1220 static int bma400_tap_event_en(struct bma400_data *data,
1221                                enum iio_event_direction dir, int state)
1222 {
1223         unsigned int mask, field_value;
1224         int ret;
1225
1226         /*
1227          * Tap interrupts can be configured only in normal mode.
1228          * See table in section 4.3 "Power modes - performance modes" of
1229          * datasheet v1.2.
1230          */
1231         if (data->power_mode != POWER_MODE_NORMAL)
1232                 return -EINVAL;
1233
1234         /*
1235          * Tap interrupts are operating with a data rate of 200Hz.
1236          * See section 4.7 "Tap sensing interrupt" in datasheet v1.2.
1237          */
1238         if (data->sample_freq.hz != 200 && state) {
1239                 dev_err(data->dev, "Invalid data rate for tap interrupts.\n");
1240                 return -EINVAL;
1241         }
1242
1243         ret = regmap_update_bits(data->regmap, BMA400_INT12_MAP_REG,
1244                                  BMA400_S_TAP_MSK,
1245                                  FIELD_PREP(BMA400_S_TAP_MSK, state));
1246         if (ret)
1247                 return ret;
1248
1249         switch (dir) {
1250         case IIO_EV_DIR_SINGLETAP:
1251                 mask = BMA400_S_TAP_MSK;
1252                 set_mask_bits(&field_value, BMA400_S_TAP_MSK,
1253                               FIELD_PREP(BMA400_S_TAP_MSK, state));
1254                 break;
1255         case IIO_EV_DIR_DOUBLETAP:
1256                 mask = BMA400_D_TAP_MSK;
1257                 set_mask_bits(&field_value, BMA400_D_TAP_MSK,
1258                               FIELD_PREP(BMA400_D_TAP_MSK, state));
1259                 break;
1260         default:
1261                 return -EINVAL;
1262         }
1263
1264         ret = regmap_update_bits(data->regmap, BMA400_INT_CONFIG1_REG, mask,
1265                                  field_value);
1266         if (ret)
1267                 return ret;
1268
1269         set_mask_bits(&data->tap_event_en_bitmask, mask, field_value);
1270
1271         return 0;
1272 }
1273
1274 static int bma400_disable_adv_interrupt(struct bma400_data *data)
1275 {
1276         int ret;
1277
1278         ret = regmap_write(data->regmap, BMA400_INT_CONFIG0_REG, 0);
1279         if (ret)
1280                 return ret;
1281
1282         ret = regmap_write(data->regmap, BMA400_INT_CONFIG1_REG, 0);
1283         if (ret)
1284                 return ret;
1285
1286         data->tap_event_en_bitmask = 0;
1287         data->generic_event_en = 0;
1288         data->step_event_en = false;
1289         data->activity_event_en = false;
1290
1291         return 0;
1292 }
1293
1294 static int bma400_write_event_config(struct iio_dev *indio_dev,
1295                                      const struct iio_chan_spec *chan,
1296                                      enum iio_event_type type,
1297                                      enum iio_event_direction dir, int state)
1298 {
1299         struct bma400_data *data = iio_priv(indio_dev);
1300         int ret;
1301
1302         switch (chan->type) {
1303         case IIO_ACCEL:
1304                 switch (type) {
1305                 case IIO_EV_TYPE_MAG:
1306                         mutex_lock(&data->mutex);
1307                         ret = bma400_activity_event_en(data, dir, state);
1308                         mutex_unlock(&data->mutex);
1309                         return ret;
1310                 case IIO_EV_TYPE_GESTURE:
1311                         mutex_lock(&data->mutex);
1312                         ret = bma400_tap_event_en(data, dir, state);
1313                         mutex_unlock(&data->mutex);
1314                         return ret;
1315                 default:
1316                         return -EINVAL;
1317                 }
1318         case IIO_STEPS:
1319                 mutex_lock(&data->mutex);
1320                 ret = bma400_steps_event_enable(data, state);
1321                 mutex_unlock(&data->mutex);
1322                 return ret;
1323         case IIO_ACTIVITY:
1324                 mutex_lock(&data->mutex);
1325                 if (!data->step_event_en) {
1326                         ret = bma400_steps_event_enable(data, true);
1327                         if (ret) {
1328                                 mutex_unlock(&data->mutex);
1329                                 return ret;
1330                         }
1331                 }
1332                 data->activity_event_en = state;
1333                 mutex_unlock(&data->mutex);
1334                 return 0;
1335         default:
1336                 return -EINVAL;
1337         }
1338 }
1339
1340 static int get_gen_config_reg(enum iio_event_direction dir)
1341 {
1342         switch (dir) {
1343         case IIO_EV_DIR_FALLING:
1344                 return BMA400_GEN2INT_CONFIG0;
1345         case IIO_EV_DIR_RISING:
1346                 return BMA400_GEN1INT_CONFIG0;
1347         default:
1348                 return -EINVAL;
1349         }
1350 }
1351
1352 static int bma400_read_event_value(struct iio_dev *indio_dev,
1353                                    const struct iio_chan_spec *chan,
1354                                    enum iio_event_type type,
1355                                    enum iio_event_direction dir,
1356                                    enum iio_event_info info,
1357                                    int *val, int *val2)
1358 {
1359         struct bma400_data *data = iio_priv(indio_dev);
1360         int ret, reg, reg_val, raw;
1361
1362         if (chan->type != IIO_ACCEL)
1363                 return -EINVAL;
1364
1365         switch (type) {
1366         case IIO_EV_TYPE_MAG:
1367                 reg = get_gen_config_reg(dir);
1368                 if (reg < 0)
1369                         return -EINVAL;
1370
1371                 *val2 = 0;
1372                 switch (info) {
1373                 case IIO_EV_INFO_VALUE:
1374                         ret = regmap_read(data->regmap,
1375                                           reg + BMA400_GEN_CONFIG2_OFF,
1376                                           val);
1377                         if (ret)
1378                                 return ret;
1379                         return IIO_VAL_INT;
1380                 case IIO_EV_INFO_PERIOD:
1381                         mutex_lock(&data->mutex);
1382                         ret = regmap_bulk_read(data->regmap,
1383                                                reg + BMA400_GEN_CONFIG3_OFF,
1384                                                &data->duration,
1385                                                sizeof(data->duration));
1386                         if (ret) {
1387                                 mutex_unlock(&data->mutex);
1388                                 return ret;
1389                         }
1390                         *val = be16_to_cpu(data->duration);
1391                         mutex_unlock(&data->mutex);
1392                         return IIO_VAL_INT;
1393                 case IIO_EV_INFO_HYSTERESIS:
1394                         ret = regmap_read(data->regmap, reg, val);
1395                         if (ret)
1396                                 return ret;
1397                         *val = FIELD_GET(BMA400_GEN_HYST_MSK, *val);
1398                         return IIO_VAL_INT;
1399                 default:
1400                         return -EINVAL;
1401                 }
1402         case IIO_EV_TYPE_GESTURE:
1403                 switch (info) {
1404                 case IIO_EV_INFO_VALUE:
1405                         ret = regmap_read(data->regmap, BMA400_TAP_CONFIG,
1406                                           &reg_val);
1407                         if (ret)
1408                                 return ret;
1409
1410                         *val = FIELD_GET(BMA400_TAP_SEN_MSK, reg_val);
1411                         return IIO_VAL_INT;
1412                 case IIO_EV_INFO_RESET_TIMEOUT:
1413                         ret = regmap_read(data->regmap, BMA400_TAP_CONFIG1,
1414                                           &reg_val);
1415                         if (ret)
1416                                 return ret;
1417
1418                         raw = FIELD_GET(BMA400_TAP_QUIET_MSK, reg_val);
1419                         *val = 0;
1420                         *val2 = tap_reset_timeout[raw];
1421                         return IIO_VAL_INT_PLUS_MICRO;
1422                 case IIO_EV_INFO_TAP2_MIN_DELAY:
1423                         ret = regmap_read(data->regmap, BMA400_TAP_CONFIG1,
1424                                           &reg_val);
1425                         if (ret)
1426                                 return ret;
1427
1428                         raw = FIELD_GET(BMA400_TAP_QUIETDT_MSK, reg_val);
1429                         *val = 0;
1430                         *val2 = double_tap2_min_delay[raw];
1431                         return IIO_VAL_INT_PLUS_MICRO;
1432                 default:
1433                         return -EINVAL;
1434                 }
1435         default:
1436                 return -EINVAL;
1437         }
1438 }
1439
1440 static int bma400_write_event_value(struct iio_dev *indio_dev,
1441                                     const struct iio_chan_spec *chan,
1442                                     enum iio_event_type type,
1443                                     enum iio_event_direction dir,
1444                                     enum iio_event_info info,
1445                                     int val, int val2)
1446 {
1447         struct bma400_data *data = iio_priv(indio_dev);
1448         int reg, ret, raw;
1449
1450         if (chan->type != IIO_ACCEL)
1451                 return -EINVAL;
1452
1453         switch (type) {
1454         case IIO_EV_TYPE_MAG:
1455                 reg = get_gen_config_reg(dir);
1456                 if (reg < 0)
1457                         return -EINVAL;
1458
1459                 switch (info) {
1460                 case IIO_EV_INFO_VALUE:
1461                         if (val < 1 || val > 255)
1462                                 return -EINVAL;
1463
1464                         return regmap_write(data->regmap,
1465                                             reg + BMA400_GEN_CONFIG2_OFF,
1466                                             val);
1467                 case IIO_EV_INFO_PERIOD:
1468                         if (val < 1 || val > 65535)
1469                                 return -EINVAL;
1470
1471                         mutex_lock(&data->mutex);
1472                         put_unaligned_be16(val, &data->duration);
1473                         ret = regmap_bulk_write(data->regmap,
1474                                                 reg + BMA400_GEN_CONFIG3_OFF,
1475                                                 &data->duration,
1476                                                 sizeof(data->duration));
1477                         mutex_unlock(&data->mutex);
1478                         return ret;
1479                 case IIO_EV_INFO_HYSTERESIS:
1480                         if (val < 0 || val > 3)
1481                                 return -EINVAL;
1482
1483                         return regmap_update_bits(data->regmap, reg,
1484                                                   BMA400_GEN_HYST_MSK,
1485                                                   FIELD_PREP(BMA400_GEN_HYST_MSK,
1486                                                              val));
1487                 default:
1488                         return -EINVAL;
1489                 }
1490         case IIO_EV_TYPE_GESTURE:
1491                 switch (info) {
1492                 case IIO_EV_INFO_VALUE:
1493                         if (val < 0 || val > 7)
1494                                 return -EINVAL;
1495
1496                         return regmap_update_bits(data->regmap,
1497                                                   BMA400_TAP_CONFIG,
1498                                                   BMA400_TAP_SEN_MSK,
1499                                                   FIELD_PREP(BMA400_TAP_SEN_MSK,
1500                                                              val));
1501                 case IIO_EV_INFO_RESET_TIMEOUT:
1502                         raw = usec_to_tapreg_raw(val2, tap_reset_timeout);
1503                         if (raw < 0)
1504                                 return -EINVAL;
1505
1506                         return regmap_update_bits(data->regmap,
1507                                                   BMA400_TAP_CONFIG1,
1508                                                   BMA400_TAP_QUIET_MSK,
1509                                                   FIELD_PREP(BMA400_TAP_QUIET_MSK,
1510                                                              raw));
1511                 case IIO_EV_INFO_TAP2_MIN_DELAY:
1512                         raw = usec_to_tapreg_raw(val2, double_tap2_min_delay);
1513                         if (raw < 0)
1514                                 return -EINVAL;
1515
1516                         return regmap_update_bits(data->regmap,
1517                                                   BMA400_TAP_CONFIG1,
1518                                                   BMA400_TAP_QUIETDT_MSK,
1519                                                   FIELD_PREP(BMA400_TAP_QUIETDT_MSK,
1520                                                              raw));
1521                 default:
1522                         return -EINVAL;
1523                 }
1524         default:
1525                 return -EINVAL;
1526         }
1527 }
1528
1529 static int bma400_data_rdy_trigger_set_state(struct iio_trigger *trig,
1530                                              bool state)
1531 {
1532         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
1533         struct bma400_data *data = iio_priv(indio_dev);
1534         int ret;
1535
1536         ret = regmap_update_bits(data->regmap, BMA400_INT_CONFIG0_REG,
1537                                  BMA400_INT_DRDY_MSK,
1538                                  FIELD_PREP(BMA400_INT_DRDY_MSK, state));
1539         if (ret)
1540                 return ret;
1541
1542         return regmap_update_bits(data->regmap, BMA400_INT1_MAP_REG,
1543                                   BMA400_INT_DRDY_MSK,
1544                                   FIELD_PREP(BMA400_INT_DRDY_MSK, state));
1545 }
1546
1547 static const unsigned long bma400_avail_scan_masks[] = {
1548         BIT(BMA400_ACCL_X) | BIT(BMA400_ACCL_Y) | BIT(BMA400_ACCL_Z),
1549         BIT(BMA400_ACCL_X) | BIT(BMA400_ACCL_Y) | BIT(BMA400_ACCL_Z)
1550         | BIT(BMA400_TEMP),
1551         0
1552 };
1553
1554 static const struct iio_info bma400_info = {
1555         .read_raw          = bma400_read_raw,
1556         .read_avail        = bma400_read_avail,
1557         .write_raw         = bma400_write_raw,
1558         .write_raw_get_fmt = bma400_write_raw_get_fmt,
1559         .read_event_config = bma400_read_event_config,
1560         .write_event_config = bma400_write_event_config,
1561         .write_event_value = bma400_write_event_value,
1562         .read_event_value = bma400_read_event_value,
1563         .event_attrs = &bma400_event_attribute_group,
1564 };
1565
1566 static const struct iio_trigger_ops bma400_trigger_ops = {
1567         .set_trigger_state = &bma400_data_rdy_trigger_set_state,
1568         .validate_device = &iio_trigger_validate_own_device,
1569 };
1570
1571 static irqreturn_t bma400_trigger_handler(int irq, void *p)
1572 {
1573         struct iio_poll_func *pf = p;
1574         struct iio_dev *indio_dev = pf->indio_dev;
1575         struct bma400_data *data = iio_priv(indio_dev);
1576         int ret, temp;
1577
1578         /* Lock to protect the data->buffer */
1579         mutex_lock(&data->mutex);
1580
1581         /* bulk read six registers, with the base being the LSB register */
1582         ret = regmap_bulk_read(data->regmap, BMA400_X_AXIS_LSB_REG,
1583                                &data->buffer.buff, sizeof(data->buffer.buff));
1584         if (ret)
1585                 goto unlock_err;
1586
1587         if (test_bit(BMA400_TEMP, indio_dev->active_scan_mask)) {
1588                 ret = regmap_read(data->regmap, BMA400_TEMP_DATA_REG, &temp);
1589                 if (ret)
1590                         goto unlock_err;
1591
1592                 data->buffer.temperature = temp;
1593         }
1594
1595         iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer,
1596                                            iio_get_time_ns(indio_dev));
1597
1598         mutex_unlock(&data->mutex);
1599         iio_trigger_notify_done(indio_dev->trig);
1600         return IRQ_HANDLED;
1601
1602 unlock_err:
1603         mutex_unlock(&data->mutex);
1604         return IRQ_NONE;
1605 }
1606
1607 static irqreturn_t bma400_interrupt(int irq, void *private)
1608 {
1609         struct iio_dev *indio_dev = private;
1610         struct bma400_data *data = iio_priv(indio_dev);
1611         s64 timestamp = iio_get_time_ns(indio_dev);
1612         unsigned int act, ev_dir = IIO_EV_DIR_NONE;
1613         int ret;
1614
1615         /* Lock to protect the data->status */
1616         mutex_lock(&data->mutex);
1617         ret = regmap_bulk_read(data->regmap, BMA400_INT_STAT0_REG,
1618                                &data->status,
1619                                sizeof(data->status));
1620         /*
1621          * if none of the bit is set in the status register then it is
1622          * spurious interrupt.
1623          */
1624         if (ret || !data->status)
1625                 goto unlock_err;
1626
1627         /*
1628          * Disable all advance interrupts if interrupt engine overrun occurs.
1629          * See section 4.7 "Interrupt engine overrun" in datasheet v1.2.
1630          */
1631         if (FIELD_GET(BMA400_INT_ENG_OVRUN_MSK, le16_to_cpu(data->status))) {
1632                 bma400_disable_adv_interrupt(data);
1633                 dev_err(data->dev, "Interrupt engine overrun\n");
1634                 goto unlock_err;
1635         }
1636
1637         if (FIELD_GET(BMA400_INT_S_TAP_MSK, le16_to_cpu(data->status)))
1638                 iio_push_event(indio_dev,
1639                                IIO_MOD_EVENT_CODE(IIO_ACCEL, 0,
1640                                                   IIO_MOD_X_OR_Y_OR_Z,
1641                                                   IIO_EV_TYPE_GESTURE,
1642                                                   IIO_EV_DIR_SINGLETAP),
1643                                timestamp);
1644
1645         if (FIELD_GET(BMA400_INT_D_TAP_MSK, le16_to_cpu(data->status)))
1646                 iio_push_event(indio_dev,
1647                                IIO_MOD_EVENT_CODE(IIO_ACCEL, 0,
1648                                                   IIO_MOD_X_OR_Y_OR_Z,
1649                                                   IIO_EV_TYPE_GESTURE,
1650                                                   IIO_EV_DIR_DOUBLETAP),
1651                                timestamp);
1652
1653         if (FIELD_GET(BMA400_INT_GEN1_MSK, le16_to_cpu(data->status)))
1654                 ev_dir = IIO_EV_DIR_RISING;
1655
1656         if (FIELD_GET(BMA400_INT_GEN2_MSK, le16_to_cpu(data->status)))
1657                 ev_dir = IIO_EV_DIR_FALLING;
1658
1659         if (ev_dir != IIO_EV_DIR_NONE) {
1660                 iio_push_event(indio_dev,
1661                                IIO_MOD_EVENT_CODE(IIO_ACCEL, 0,
1662                                                   IIO_MOD_X_OR_Y_OR_Z,
1663                                                   IIO_EV_TYPE_MAG, ev_dir),
1664                                timestamp);
1665         }
1666
1667         if (FIELD_GET(BMA400_STEP_STAT_MASK, le16_to_cpu(data->status))) {
1668                 iio_push_event(indio_dev,
1669                                IIO_MOD_EVENT_CODE(IIO_STEPS, 0, IIO_NO_MOD,
1670                                                   IIO_EV_TYPE_CHANGE,
1671                                                   IIO_EV_DIR_NONE),
1672                                timestamp);
1673
1674                 if (data->activity_event_en) {
1675                         ret = regmap_read(data->regmap, BMA400_STEP_STAT_REG,
1676                                           &act);
1677                         if (ret)
1678                                 goto unlock_err;
1679
1680                         iio_push_event(indio_dev,
1681                                        IIO_MOD_EVENT_CODE(IIO_ACTIVITY, 0,
1682                                                           bma400_act_to_mod(act),
1683                                                           IIO_EV_TYPE_CHANGE,
1684                                                           IIO_EV_DIR_NONE),
1685                                        timestamp);
1686                 }
1687         }
1688
1689         if (FIELD_GET(BMA400_INT_DRDY_MSK, le16_to_cpu(data->status))) {
1690                 mutex_unlock(&data->mutex);
1691                 iio_trigger_poll_nested(data->trig);
1692                 return IRQ_HANDLED;
1693         }
1694
1695         mutex_unlock(&data->mutex);
1696         return IRQ_HANDLED;
1697
1698 unlock_err:
1699         mutex_unlock(&data->mutex);
1700         return IRQ_NONE;
1701 }
1702
1703 int bma400_probe(struct device *dev, struct regmap *regmap, int irq,
1704                  const char *name)
1705 {
1706         struct iio_dev *indio_dev;
1707         struct bma400_data *data;
1708         int ret;
1709
1710         indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
1711         if (!indio_dev)
1712                 return -ENOMEM;
1713
1714         data = iio_priv(indio_dev);
1715         data->regmap = regmap;
1716         data->dev = dev;
1717
1718         ret = bma400_init(data);
1719         if (ret)
1720                 return ret;
1721
1722         ret = iio_read_mount_matrix(dev, &data->orientation);
1723         if (ret)
1724                 return ret;
1725
1726         mutex_init(&data->mutex);
1727         indio_dev->name = name;
1728         indio_dev->info = &bma400_info;
1729         indio_dev->channels = bma400_channels;
1730         indio_dev->num_channels = ARRAY_SIZE(bma400_channels);
1731         indio_dev->available_scan_masks = bma400_avail_scan_masks;
1732         indio_dev->modes = INDIO_DIRECT_MODE;
1733
1734         if (irq > 0) {
1735                 data->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
1736                                                     indio_dev->name,
1737                                                     iio_device_id(indio_dev));
1738                 if (!data->trig)
1739                         return -ENOMEM;
1740
1741                 data->trig->ops = &bma400_trigger_ops;
1742                 iio_trigger_set_drvdata(data->trig, indio_dev);
1743
1744                 ret = devm_iio_trigger_register(data->dev, data->trig);
1745                 if (ret)
1746                         return dev_err_probe(data->dev, ret,
1747                                              "iio trigger register fail\n");
1748
1749                 indio_dev->trig = iio_trigger_get(data->trig);
1750                 ret = devm_request_threaded_irq(dev, irq, NULL,
1751                                                 &bma400_interrupt,
1752                                                 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
1753                                                 indio_dev->name, indio_dev);
1754                 if (ret)
1755                         return dev_err_probe(data->dev, ret,
1756                                              "request irq %d failed\n", irq);
1757         }
1758
1759         ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
1760                                               &bma400_trigger_handler, NULL);
1761         if (ret)
1762                 return dev_err_probe(data->dev, ret,
1763                                      "iio triggered buffer setup failed\n");
1764
1765         return devm_iio_device_register(dev, indio_dev);
1766 }
1767 EXPORT_SYMBOL_NS(bma400_probe, IIO_BMA400);
1768
1769 MODULE_AUTHOR("Dan Robertson <[email protected]>");
1770 MODULE_AUTHOR("Jagath Jog J <[email protected]>");
1771 MODULE_DESCRIPTION("Bosch BMA400 triaxial acceleration sensor core");
1772 MODULE_LICENSE("GPL");
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