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1 /*
2  * bma180.c - IIO driver for Bosch BMA180 triaxial acceleration sensor
3  *
4  * Copyright 2013 Oleksandr Kravchenko <x0199363@ti.com>
5  *
6  * Support for BMA250 (c) Peter Meerwald <pmeerw@pmeerw.net>
7  *
8  * This file is subject to the terms and conditions of version 2 of
9  * the GNU General Public License.  See the file COPYING in the main
10  * directory of this archive for more details.
11  *
12  * SPI is not supported by driver
13  * BMA180: 7-bit I2C slave address 0x40 or 0x41
14  * BMA250: 7-bit I2C slave address 0x18 or 0x19
15  */
16 
17 #include <linux/module.h>
18 #include <linux/i2c.h>
19 #include <linux/interrupt.h>
20 #include <linux/delay.h>
21 #include <linux/of.h>
22 #include <linux/bitops.h>
23 #include <linux/slab.h>
24 #include <linux/string.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 {
36 	BMA180,
37 	BMA250,
38 };
39 
40 struct bma180_data;
41 
42 struct bma180_part_info {
43 	const struct iio_chan_spec *channels;
44 	unsigned num_channels;
45 	const int *scale_table;
46 	unsigned num_scales;
47 	const int *bw_table;
48 	unsigned num_bw;
49 
50 	u8 int_reset_reg, int_reset_mask;
51 	u8 sleep_reg, sleep_mask;
52 	u8 bw_reg, bw_mask;
53 	u8 scale_reg, scale_mask;
54 	u8 power_reg, power_mask, lowpower_val;
55 	u8 int_enable_reg, int_enable_mask;
56 	u8 softreset_reg;
57 
58 	int (*chip_config)(struct bma180_data *data);
59 	void (*chip_disable)(struct bma180_data *data);
60 };
61 
62 /* Register set */
63 #define BMA180_CHIP_ID		0x00 /* Need to distinguish BMA180 from other */
64 #define BMA180_ACC_X_LSB	0x02 /* First of 6 registers of accel data */
65 #define BMA180_TEMP		0x08
66 #define BMA180_CTRL_REG0	0x0d
67 #define BMA180_RESET		0x10
68 #define BMA180_BW_TCS		0x20
69 #define BMA180_CTRL_REG3	0x21
70 #define BMA180_TCO_Z		0x30
71 #define BMA180_OFFSET_LSB1	0x35
72 
73 /* BMA180_CTRL_REG0 bits */
74 #define BMA180_DIS_WAKE_UP	BIT(0) /* Disable wake up mode */
75 #define BMA180_SLEEP		BIT(1) /* 1 - chip will sleep */
76 #define BMA180_EE_W		BIT(4) /* Unlock writing to addr from 0x20 */
77 #define BMA180_RESET_INT	BIT(6) /* Reset pending interrupts */
78 
79 /* BMA180_CTRL_REG3 bits */
80 #define BMA180_NEW_DATA_INT	BIT(1) /* Intr every new accel data is ready */
81 
82 /* BMA180_OFFSET_LSB1 skipping mode bit */
83 #define BMA180_SMP_SKIP		BIT(0)
84 
85 /* Bit masks for registers bit fields */
86 #define BMA180_RANGE		0x0e /* Range of measured accel values */
87 #define BMA180_BW		0xf0 /* Accel bandwidth */
88 #define BMA180_MODE_CONFIG	0x03 /* Config operation modes */
89 
90 /* We have to write this value in reset register to do soft reset */
91 #define BMA180_RESET_VAL	0xb6
92 
93 #define BMA180_ID_REG_VAL	0x03
94 
95 /* Chip power modes */
96 #define BMA180_LOW_POWER	0x03
97 
98 #define BMA250_RANGE_REG	0x0f
99 #define BMA250_BW_REG		0x10
100 #define BMA250_POWER_REG	0x11
101 #define BMA250_RESET_REG	0x14
102 #define BMA250_INT_ENABLE_REG	0x17
103 #define BMA250_INT_MAP_REG	0x1a
104 #define BMA250_INT_RESET_REG	0x21
105 
106 #define BMA250_RANGE_MASK	GENMASK(3, 0) /* Range of accel values */
107 #define BMA250_BW_MASK		GENMASK(4, 0) /* Accel bandwidth */
108 #define BMA250_SUSPEND_MASK	BIT(7) /* chip will sleep */
109 #define BMA250_LOWPOWER_MASK	BIT(6)
110 #define BMA250_DATA_INTEN_MASK	BIT(4)
111 #define BMA250_INT1_DATA_MASK	BIT(0)
112 #define BMA250_INT_RESET_MASK	BIT(7) /* Reset pending interrupts */
113 
114 struct bma180_data {
115 	struct i2c_client *client;
116 	struct iio_trigger *trig;
117 	const struct bma180_part_info *part_info;
118 	struct mutex mutex;
119 	bool sleep_state;
120 	int scale;
121 	int bw;
122 	bool pmode;
123 	u8 buff[16]; /* 3x 16-bit + 8-bit + padding + timestamp */
124 };
125 
126 enum bma180_chan {
127 	AXIS_X,
128 	AXIS_Y,
129 	AXIS_Z,
130 	TEMP
131 };
132 
133 static int bma180_bw_table[] = { 10, 20, 40, 75, 150, 300 }; /* Hz */
134 static int bma180_scale_table[] = { 1275, 1863, 2452, 3727, 4903, 9709, 19417 };
135 
136 static int bma250_bw_table[] = { 8, 16, 31, 63, 125, 250 }; /* Hz */
137 static int bma250_scale_table[] = { 0, 0, 0, 38344, 0, 76590, 0, 0, 153180, 0,
138 	0, 0, 306458 };
139 
bma180_get_data_reg(struct bma180_data * data,enum bma180_chan chan)140 static int bma180_get_data_reg(struct bma180_data *data, enum bma180_chan chan)
141 {
142 	int ret;
143 
144 	if (data->sleep_state)
145 		return -EBUSY;
146 
147 	switch (chan) {
148 	case TEMP:
149 		ret = i2c_smbus_read_byte_data(data->client, BMA180_TEMP);
150 		if (ret < 0)
151 			dev_err(&data->client->dev, "failed to read temp register\n");
152 		break;
153 	default:
154 		ret = i2c_smbus_read_word_data(data->client,
155 			BMA180_ACC_X_LSB + chan * 2);
156 		if (ret < 0)
157 			dev_err(&data->client->dev,
158 				"failed to read accel_%c register\n",
159 				'x' + chan);
160 	}
161 
162 	return ret;
163 }
164 
bma180_set_bits(struct bma180_data * data,u8 reg,u8 mask,u8 val)165 static int bma180_set_bits(struct bma180_data *data, u8 reg, u8 mask, u8 val)
166 {
167 	int ret = i2c_smbus_read_byte_data(data->client, reg);
168 	u8 reg_val = (ret & ~mask) | (val << (ffs(mask) - 1));
169 
170 	if (ret < 0)
171 		return ret;
172 
173 	return i2c_smbus_write_byte_data(data->client, reg, reg_val);
174 }
175 
bma180_reset_intr(struct bma180_data * data)176 static int bma180_reset_intr(struct bma180_data *data)
177 {
178 	int ret = bma180_set_bits(data, data->part_info->int_reset_reg,
179 		data->part_info->int_reset_mask, 1);
180 
181 	if (ret)
182 		dev_err(&data->client->dev, "failed to reset interrupt\n");
183 
184 	return ret;
185 }
186 
bma180_set_new_data_intr_state(struct bma180_data * data,bool state)187 static int bma180_set_new_data_intr_state(struct bma180_data *data, bool state)
188 {
189 	int ret = bma180_set_bits(data, data->part_info->int_enable_reg,
190 			data->part_info->int_enable_mask, state);
191 	if (ret)
192 		goto err;
193 	ret = bma180_reset_intr(data);
194 	if (ret)
195 		goto err;
196 
197 	return 0;
198 
199 err:
200 	dev_err(&data->client->dev,
201 		"failed to set new data interrupt state %d\n", state);
202 	return ret;
203 }
204 
bma180_set_sleep_state(struct bma180_data * data,bool state)205 static int bma180_set_sleep_state(struct bma180_data *data, bool state)
206 {
207 	int ret = bma180_set_bits(data, data->part_info->sleep_reg,
208 		data->part_info->sleep_mask, state);
209 
210 	if (ret) {
211 		dev_err(&data->client->dev,
212 			"failed to set sleep state %d\n", state);
213 		return ret;
214 	}
215 	data->sleep_state = state;
216 
217 	return 0;
218 }
219 
bma180_set_ee_writing_state(struct bma180_data * data,bool state)220 static int bma180_set_ee_writing_state(struct bma180_data *data, bool state)
221 {
222 	int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_EE_W, state);
223 
224 	if (ret)
225 		dev_err(&data->client->dev,
226 			"failed to set ee writing state %d\n", state);
227 
228 	return ret;
229 }
230 
bma180_set_bw(struct bma180_data * data,int val)231 static int bma180_set_bw(struct bma180_data *data, int val)
232 {
233 	int ret, i;
234 
235 	if (data->sleep_state)
236 		return -EBUSY;
237 
238 	for (i = 0; i < data->part_info->num_bw; ++i) {
239 		if (data->part_info->bw_table[i] == val) {
240 			ret = bma180_set_bits(data, data->part_info->bw_reg,
241 				data->part_info->bw_mask, i);
242 			if (ret) {
243 				dev_err(&data->client->dev,
244 					"failed to set bandwidth\n");
245 				return ret;
246 			}
247 			data->bw = val;
248 			return 0;
249 		}
250 	}
251 
252 	return -EINVAL;
253 }
254 
bma180_set_scale(struct bma180_data * data,int val)255 static int bma180_set_scale(struct bma180_data *data, int val)
256 {
257 	int ret, i;
258 
259 	if (data->sleep_state)
260 		return -EBUSY;
261 
262 	for (i = 0; i < data->part_info->num_scales; ++i)
263 		if (data->part_info->scale_table[i] == val) {
264 			ret = bma180_set_bits(data, data->part_info->scale_reg,
265 				data->part_info->scale_mask, i);
266 			if (ret) {
267 				dev_err(&data->client->dev,
268 					"failed to set scale\n");
269 				return ret;
270 			}
271 			data->scale = val;
272 			return 0;
273 		}
274 
275 	return -EINVAL;
276 }
277 
bma180_set_pmode(struct bma180_data * data,bool mode)278 static int bma180_set_pmode(struct bma180_data *data, bool mode)
279 {
280 	u8 reg_val = mode ? data->part_info->lowpower_val : 0;
281 	int ret = bma180_set_bits(data, data->part_info->power_reg,
282 		data->part_info->power_mask, reg_val);
283 
284 	if (ret) {
285 		dev_err(&data->client->dev, "failed to set power mode\n");
286 		return ret;
287 	}
288 	data->pmode = mode;
289 
290 	return 0;
291 }
292 
bma180_soft_reset(struct bma180_data * data)293 static int bma180_soft_reset(struct bma180_data *data)
294 {
295 	int ret = i2c_smbus_write_byte_data(data->client,
296 		data->part_info->softreset_reg, BMA180_RESET_VAL);
297 
298 	if (ret)
299 		dev_err(&data->client->dev, "failed to reset the chip\n");
300 
301 	return ret;
302 }
303 
bma180_chip_init(struct bma180_data * data)304 static int bma180_chip_init(struct bma180_data *data)
305 {
306 	/* Try to read chip_id register. It must return 0x03. */
307 	int ret = i2c_smbus_read_byte_data(data->client, BMA180_CHIP_ID);
308 
309 	if (ret < 0)
310 		return ret;
311 	if (ret != BMA180_ID_REG_VAL)
312 		return -ENODEV;
313 
314 	ret = bma180_soft_reset(data);
315 	if (ret)
316 		return ret;
317 	/*
318 	 * No serial transaction should occur within minimum 10 us
319 	 * after soft_reset command
320 	 */
321 	msleep(20);
322 
323 	ret = bma180_set_new_data_intr_state(data, false);
324 	if (ret)
325 		return ret;
326 
327 	return bma180_set_pmode(data, false);
328 }
329 
bma180_chip_config(struct bma180_data * data)330 static int bma180_chip_config(struct bma180_data *data)
331 {
332 	int ret = bma180_chip_init(data);
333 
334 	if (ret)
335 		goto err;
336 	ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_DIS_WAKE_UP, 1);
337 	if (ret)
338 		goto err;
339 	ret = bma180_set_ee_writing_state(data, true);
340 	if (ret)
341 		goto err;
342 	ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP, 1);
343 	if (ret)
344 		goto err;
345 	ret = bma180_set_bw(data, 20); /* 20 Hz */
346 	if (ret)
347 		goto err;
348 	ret = bma180_set_scale(data, 2452); /* 2 G */
349 	if (ret)
350 		goto err;
351 
352 	return 0;
353 
354 err:
355 	dev_err(&data->client->dev, "failed to config the chip\n");
356 	return ret;
357 }
358 
bma250_chip_config(struct bma180_data * data)359 static int bma250_chip_config(struct bma180_data *data)
360 {
361 	int ret = bma180_chip_init(data);
362 
363 	if (ret)
364 		goto err;
365 	ret = bma180_set_bw(data, 16); /* 16 Hz */
366 	if (ret)
367 		goto err;
368 	ret = bma180_set_scale(data, 38344); /* 2 G */
369 	if (ret)
370 		goto err;
371 	ret = bma180_set_bits(data, BMA250_INT_MAP_REG,
372 		BMA250_INT1_DATA_MASK, 1);
373 	if (ret)
374 		goto err;
375 
376 	return 0;
377 
378 err:
379 	dev_err(&data->client->dev, "failed to config the chip\n");
380 	return ret;
381 }
382 
bma180_chip_disable(struct bma180_data * data)383 static void bma180_chip_disable(struct bma180_data *data)
384 {
385 	if (bma180_set_new_data_intr_state(data, false))
386 		goto err;
387 	if (bma180_set_ee_writing_state(data, false))
388 		goto err;
389 	if (bma180_set_sleep_state(data, true))
390 		goto err;
391 
392 	return;
393 
394 err:
395 	dev_err(&data->client->dev, "failed to disable the chip\n");
396 }
397 
bma250_chip_disable(struct bma180_data * data)398 static void bma250_chip_disable(struct bma180_data *data)
399 {
400 	if (bma180_set_new_data_intr_state(data, false))
401 		goto err;
402 	if (bma180_set_sleep_state(data, true))
403 		goto err;
404 
405 	return;
406 
407 err:
408 	dev_err(&data->client->dev, "failed to disable the chip\n");
409 }
410 
bma180_show_avail(char * buf,const int * vals,unsigned n,bool micros)411 static ssize_t bma180_show_avail(char *buf, const int *vals, unsigned n,
412 				 bool micros)
413 {
414 	size_t len = 0;
415 	int i;
416 
417 	for (i = 0; i < n; i++) {
418 		if (!vals[i])
419 			continue;
420 		len += scnprintf(buf + len, PAGE_SIZE - len,
421 			micros ? "0.%06d " : "%d ", vals[i]);
422 	}
423 	buf[len - 1] = '\n';
424 
425 	return len;
426 }
427 
bma180_show_filter_freq_avail(struct device * dev,struct device_attribute * attr,char * buf)428 static ssize_t bma180_show_filter_freq_avail(struct device *dev,
429 				struct device_attribute *attr, char *buf)
430 {
431 	struct bma180_data *data = iio_priv(dev_to_iio_dev(dev));
432 
433 	return bma180_show_avail(buf, data->part_info->bw_table,
434 		data->part_info->num_bw, false);
435 }
436 
bma180_show_scale_avail(struct device * dev,struct device_attribute * attr,char * buf)437 static ssize_t bma180_show_scale_avail(struct device *dev,
438 				struct device_attribute *attr, char *buf)
439 {
440 	struct bma180_data *data = iio_priv(dev_to_iio_dev(dev));
441 
442 	return bma180_show_avail(buf, data->part_info->scale_table,
443 		data->part_info->num_scales, true);
444 }
445 
446 static IIO_DEVICE_ATTR(in_accel_filter_low_pass_3db_frequency_available,
447 	S_IRUGO, bma180_show_filter_freq_avail, NULL, 0);
448 
449 static IIO_DEVICE_ATTR(in_accel_scale_available,
450 	S_IRUGO, bma180_show_scale_avail, NULL, 0);
451 
452 static struct attribute *bma180_attributes[] = {
453 	&iio_dev_attr_in_accel_filter_low_pass_3db_frequency_available.
454 		dev_attr.attr,
455 	&iio_dev_attr_in_accel_scale_available.dev_attr.attr,
456 	NULL,
457 };
458 
459 static const struct attribute_group bma180_attrs_group = {
460 	.attrs = bma180_attributes,
461 };
462 
bma180_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)463 static int bma180_read_raw(struct iio_dev *indio_dev,
464 		struct iio_chan_spec const *chan, int *val, int *val2,
465 		long mask)
466 {
467 	struct bma180_data *data = iio_priv(indio_dev);
468 	int ret;
469 
470 	switch (mask) {
471 	case IIO_CHAN_INFO_RAW:
472 		ret = iio_device_claim_direct_mode(indio_dev);
473 		if (ret)
474 			return ret;
475 
476 		mutex_lock(&data->mutex);
477 		ret = bma180_get_data_reg(data, chan->scan_index);
478 		mutex_unlock(&data->mutex);
479 		iio_device_release_direct_mode(indio_dev);
480 		if (ret < 0)
481 			return ret;
482 		*val = sign_extend32(ret >> chan->scan_type.shift,
483 			chan->scan_type.realbits - 1);
484 		return IIO_VAL_INT;
485 	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
486 		*val = data->bw;
487 		return IIO_VAL_INT;
488 	case IIO_CHAN_INFO_SCALE:
489 		switch (chan->type) {
490 		case IIO_ACCEL:
491 			*val = 0;
492 			*val2 = data->scale;
493 			return IIO_VAL_INT_PLUS_MICRO;
494 		case IIO_TEMP:
495 			*val = 500;
496 			return IIO_VAL_INT;
497 		default:
498 			return -EINVAL;
499 		}
500 	case IIO_CHAN_INFO_OFFSET:
501 		*val = 48; /* 0 LSB @ 24 degree C */
502 		return IIO_VAL_INT;
503 	default:
504 		return -EINVAL;
505 	}
506 }
507 
bma180_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)508 static int bma180_write_raw(struct iio_dev *indio_dev,
509 		struct iio_chan_spec const *chan, int val, int val2, long mask)
510 {
511 	struct bma180_data *data = iio_priv(indio_dev);
512 	int ret;
513 
514 	switch (mask) {
515 	case IIO_CHAN_INFO_SCALE:
516 		if (val)
517 			return -EINVAL;
518 		mutex_lock(&data->mutex);
519 		ret = bma180_set_scale(data, val2);
520 		mutex_unlock(&data->mutex);
521 		return ret;
522 	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
523 		if (val2)
524 			return -EINVAL;
525 		mutex_lock(&data->mutex);
526 		ret = bma180_set_bw(data, val);
527 		mutex_unlock(&data->mutex);
528 		return ret;
529 	default:
530 		return -EINVAL;
531 	}
532 }
533 
534 static const struct iio_info bma180_info = {
535 	.attrs			= &bma180_attrs_group,
536 	.read_raw		= bma180_read_raw,
537 	.write_raw		= bma180_write_raw,
538 	.driver_module		= THIS_MODULE,
539 };
540 
541 static const char * const bma180_power_modes[] = { "low_noise", "low_power" };
542 
bma180_get_power_mode(struct iio_dev * indio_dev,const struct iio_chan_spec * chan)543 static int bma180_get_power_mode(struct iio_dev *indio_dev,
544 		const struct iio_chan_spec *chan)
545 {
546 	struct bma180_data *data = iio_priv(indio_dev);
547 
548 	return data->pmode;
549 }
550 
bma180_set_power_mode(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,unsigned int mode)551 static int bma180_set_power_mode(struct iio_dev *indio_dev,
552 		const struct iio_chan_spec *chan, unsigned int mode)
553 {
554 	struct bma180_data *data = iio_priv(indio_dev);
555 	int ret;
556 
557 	mutex_lock(&data->mutex);
558 	ret = bma180_set_pmode(data, mode);
559 	mutex_unlock(&data->mutex);
560 
561 	return ret;
562 }
563 
564 static const struct iio_enum bma180_power_mode_enum = {
565 	.items = bma180_power_modes,
566 	.num_items = ARRAY_SIZE(bma180_power_modes),
567 	.get = bma180_get_power_mode,
568 	.set = bma180_set_power_mode,
569 };
570 
571 static const struct iio_chan_spec_ext_info bma180_ext_info[] = {
572 	IIO_ENUM("power_mode", true, &bma180_power_mode_enum),
573 	IIO_ENUM_AVAILABLE("power_mode", &bma180_power_mode_enum),
574 	{ },
575 };
576 
577 #define BMA180_ACC_CHANNEL(_axis, _bits) {				\
578 	.type = IIO_ACCEL,						\
579 	.modified = 1,							\
580 	.channel2 = IIO_MOD_##_axis,					\
581 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),			\
582 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |		\
583 		BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),	\
584 	.scan_index = AXIS_##_axis,					\
585 	.scan_type = {							\
586 		.sign = 's',						\
587 		.realbits = _bits,					\
588 		.storagebits = 16,					\
589 		.shift = 16 - _bits,					\
590 	},								\
591 	.ext_info = bma180_ext_info,					\
592 }
593 
594 #define BMA180_TEMP_CHANNEL {						\
595 	.type = IIO_TEMP,						\
596 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |			\
597 		BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OFFSET),	\
598 	.scan_index = TEMP,						\
599 	.scan_type = {							\
600 		.sign = 's',						\
601 		.realbits = 8,						\
602 		.storagebits = 16,					\
603 	},								\
604 }
605 
606 static const struct iio_chan_spec bma180_channels[] = {
607 	BMA180_ACC_CHANNEL(X, 14),
608 	BMA180_ACC_CHANNEL(Y, 14),
609 	BMA180_ACC_CHANNEL(Z, 14),
610 	BMA180_TEMP_CHANNEL,
611 	IIO_CHAN_SOFT_TIMESTAMP(4),
612 };
613 
614 static const struct iio_chan_spec bma250_channels[] = {
615 	BMA180_ACC_CHANNEL(X, 10),
616 	BMA180_ACC_CHANNEL(Y, 10),
617 	BMA180_ACC_CHANNEL(Z, 10),
618 	BMA180_TEMP_CHANNEL,
619 	IIO_CHAN_SOFT_TIMESTAMP(4),
620 };
621 
622 static const struct bma180_part_info bma180_part_info[] = {
623 	[BMA180] = {
624 		bma180_channels, ARRAY_SIZE(bma180_channels),
625 		bma180_scale_table, ARRAY_SIZE(bma180_scale_table),
626 		bma180_bw_table, ARRAY_SIZE(bma180_bw_table),
627 		BMA180_CTRL_REG0, BMA180_RESET_INT,
628 		BMA180_CTRL_REG0, BMA180_SLEEP,
629 		BMA180_BW_TCS, BMA180_BW,
630 		BMA180_OFFSET_LSB1, BMA180_RANGE,
631 		BMA180_TCO_Z, BMA180_MODE_CONFIG, BMA180_LOW_POWER,
632 		BMA180_CTRL_REG3, BMA180_NEW_DATA_INT,
633 		BMA180_RESET,
634 		bma180_chip_config,
635 		bma180_chip_disable,
636 	},
637 	[BMA250] = {
638 		bma250_channels, ARRAY_SIZE(bma250_channels),
639 		bma250_scale_table, ARRAY_SIZE(bma250_scale_table),
640 		bma250_bw_table, ARRAY_SIZE(bma250_bw_table),
641 		BMA250_INT_RESET_REG, BMA250_INT_RESET_MASK,
642 		BMA250_POWER_REG, BMA250_SUSPEND_MASK,
643 		BMA250_BW_REG, BMA250_BW_MASK,
644 		BMA250_RANGE_REG, BMA250_RANGE_MASK,
645 		BMA250_POWER_REG, BMA250_LOWPOWER_MASK, 1,
646 		BMA250_INT_ENABLE_REG, BMA250_DATA_INTEN_MASK,
647 		BMA250_RESET_REG,
648 		bma250_chip_config,
649 		bma250_chip_disable,
650 	},
651 };
652 
bma180_trigger_handler(int irq,void * p)653 static irqreturn_t bma180_trigger_handler(int irq, void *p)
654 {
655 	struct iio_poll_func *pf = p;
656 	struct iio_dev *indio_dev = pf->indio_dev;
657 	struct bma180_data *data = iio_priv(indio_dev);
658 	s64 time_ns = iio_get_time_ns(indio_dev);
659 	int bit, ret, i = 0;
660 
661 	mutex_lock(&data->mutex);
662 
663 	for_each_set_bit(bit, indio_dev->active_scan_mask,
664 			 indio_dev->masklength) {
665 		ret = bma180_get_data_reg(data, bit);
666 		if (ret < 0) {
667 			mutex_unlock(&data->mutex);
668 			goto err;
669 		}
670 		((s16 *)data->buff)[i++] = ret;
671 	}
672 
673 	mutex_unlock(&data->mutex);
674 
675 	iio_push_to_buffers_with_timestamp(indio_dev, data->buff, time_ns);
676 err:
677 	iio_trigger_notify_done(indio_dev->trig);
678 
679 	return IRQ_HANDLED;
680 }
681 
bma180_data_rdy_trigger_set_state(struct iio_trigger * trig,bool state)682 static int bma180_data_rdy_trigger_set_state(struct iio_trigger *trig,
683 		bool state)
684 {
685 	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
686 	struct bma180_data *data = iio_priv(indio_dev);
687 
688 	return bma180_set_new_data_intr_state(data, state);
689 }
690 
bma180_trig_try_reen(struct iio_trigger * trig)691 static int bma180_trig_try_reen(struct iio_trigger *trig)
692 {
693 	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
694 	struct bma180_data *data = iio_priv(indio_dev);
695 
696 	return bma180_reset_intr(data);
697 }
698 
699 static const struct iio_trigger_ops bma180_trigger_ops = {
700 	.set_trigger_state = bma180_data_rdy_trigger_set_state,
701 	.try_reenable = bma180_trig_try_reen,
702 	.owner = THIS_MODULE,
703 };
704 
bma180_probe(struct i2c_client * client,const struct i2c_device_id * id)705 static int bma180_probe(struct i2c_client *client,
706 		const struct i2c_device_id *id)
707 {
708 	struct bma180_data *data;
709 	struct iio_dev *indio_dev;
710 	int ret;
711 
712 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
713 	if (!indio_dev)
714 		return -ENOMEM;
715 
716 	data = iio_priv(indio_dev);
717 	i2c_set_clientdata(client, indio_dev);
718 	data->client = client;
719 	data->part_info = &bma180_part_info[id->driver_data];
720 
721 	ret = data->part_info->chip_config(data);
722 	if (ret < 0)
723 		goto err_chip_disable;
724 
725 	mutex_init(&data->mutex);
726 	indio_dev->dev.parent = &client->dev;
727 	indio_dev->channels = data->part_info->channels;
728 	indio_dev->num_channels = data->part_info->num_channels;
729 	indio_dev->name = id->name;
730 	indio_dev->modes = INDIO_DIRECT_MODE;
731 	indio_dev->info = &bma180_info;
732 
733 	if (client->irq > 0) {
734 		data->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
735 			indio_dev->id);
736 		if (!data->trig) {
737 			ret = -ENOMEM;
738 			goto err_chip_disable;
739 		}
740 
741 		ret = devm_request_irq(&client->dev, client->irq,
742 			iio_trigger_generic_data_rdy_poll, IRQF_TRIGGER_RISING,
743 			"bma180_event", data->trig);
744 		if (ret) {
745 			dev_err(&client->dev, "unable to request IRQ\n");
746 			goto err_trigger_free;
747 		}
748 
749 		data->trig->dev.parent = &client->dev;
750 		data->trig->ops = &bma180_trigger_ops;
751 		iio_trigger_set_drvdata(data->trig, indio_dev);
752 		indio_dev->trig = iio_trigger_get(data->trig);
753 
754 		ret = iio_trigger_register(data->trig);
755 		if (ret)
756 			goto err_trigger_free;
757 	}
758 
759 	ret = iio_triggered_buffer_setup(indio_dev, NULL,
760 			bma180_trigger_handler, NULL);
761 	if (ret < 0) {
762 		dev_err(&client->dev, "unable to setup iio triggered buffer\n");
763 		goto err_trigger_unregister;
764 	}
765 
766 	ret = iio_device_register(indio_dev);
767 	if (ret < 0) {
768 		dev_err(&client->dev, "unable to register iio device\n");
769 		goto err_buffer_cleanup;
770 	}
771 
772 	return 0;
773 
774 err_buffer_cleanup:
775 	iio_triggered_buffer_cleanup(indio_dev);
776 err_trigger_unregister:
777 	if (data->trig)
778 		iio_trigger_unregister(data->trig);
779 err_trigger_free:
780 	iio_trigger_free(data->trig);
781 err_chip_disable:
782 	data->part_info->chip_disable(data);
783 
784 	return ret;
785 }
786 
bma180_remove(struct i2c_client * client)787 static int bma180_remove(struct i2c_client *client)
788 {
789 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
790 	struct bma180_data *data = iio_priv(indio_dev);
791 
792 	iio_device_unregister(indio_dev);
793 	iio_triggered_buffer_cleanup(indio_dev);
794 	if (data->trig) {
795 		iio_trigger_unregister(data->trig);
796 		iio_trigger_free(data->trig);
797 	}
798 
799 	mutex_lock(&data->mutex);
800 	data->part_info->chip_disable(data);
801 	mutex_unlock(&data->mutex);
802 
803 	return 0;
804 }
805 
806 #ifdef CONFIG_PM_SLEEP
bma180_suspend(struct device * dev)807 static int bma180_suspend(struct device *dev)
808 {
809 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
810 	struct bma180_data *data = iio_priv(indio_dev);
811 	int ret;
812 
813 	mutex_lock(&data->mutex);
814 	ret = bma180_set_sleep_state(data, true);
815 	mutex_unlock(&data->mutex);
816 
817 	return ret;
818 }
819 
bma180_resume(struct device * dev)820 static int bma180_resume(struct device *dev)
821 {
822 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
823 	struct bma180_data *data = iio_priv(indio_dev);
824 	int ret;
825 
826 	mutex_lock(&data->mutex);
827 	ret = bma180_set_sleep_state(data, false);
828 	mutex_unlock(&data->mutex);
829 
830 	return ret;
831 }
832 
833 static SIMPLE_DEV_PM_OPS(bma180_pm_ops, bma180_suspend, bma180_resume);
834 #define BMA180_PM_OPS (&bma180_pm_ops)
835 #else
836 #define BMA180_PM_OPS NULL
837 #endif
838 
839 static struct i2c_device_id bma180_ids[] = {
840 	{ "bma180", BMA180 },
841 	{ "bma250", BMA250 },
842 	{ }
843 };
844 
845 MODULE_DEVICE_TABLE(i2c, bma180_ids);
846 
847 static struct i2c_driver bma180_driver = {
848 	.driver = {
849 		.name	= "bma180",
850 		.pm	= BMA180_PM_OPS,
851 	},
852 	.probe		= bma180_probe,
853 	.remove		= bma180_remove,
854 	.id_table	= bma180_ids,
855 };
856 
857 module_i2c_driver(bma180_driver);
858 
859 MODULE_AUTHOR("Kravchenko Oleksandr <x0199363@ti.com>");
860 MODULE_AUTHOR("Texas Instruments, Inc.");
861 MODULE_DESCRIPTION("Bosch BMA180/BMA250 triaxial acceleration sensor");
862 MODULE_LICENSE("GPL");
863