summaryrefslogtreecommitdiff
path: root/drivers/iio/accel/mma9551_core.c
blob: c6d5a3a40b609c9044fb57846fca951eabfe199b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
/*
 * Common code for Freescale MMA955x Intelligent Sensor Platform drivers
 * Copyright (c) 2014, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/iio/iio.h>
#include <linux/pm_runtime.h>
#include "mma9551_core.h"

/* Command masks for mailbox write command */
#define MMA9551_CMD_READ_VERSION_INFO	0x00
#define MMA9551_CMD_READ_CONFIG		0x10
#define MMA9551_CMD_WRITE_CONFIG	0x20
#define MMA9551_CMD_READ_STATUS		0x30

/* Mailbox read command */
#define MMA9551_RESPONSE_COCO		BIT(7)

/* Error-Status codes returned in mailbox read command */
#define MMA9551_MCI_ERROR_NONE			0x00
#define MMA9551_MCI_ERROR_PARAM			0x04
#define MMA9551_MCI_INVALID_COUNT		0x19
#define MMA9551_MCI_ERROR_COMMAND		0x1C
#define MMA9551_MCI_ERROR_INVALID_LENGTH	0x21
#define MMA9551_MCI_ERROR_FIFO_BUSY		0x22
#define MMA9551_MCI_ERROR_FIFO_ALLOCATED	0x23
#define MMA9551_MCI_ERROR_FIFO_OVERSIZE		0x24

/* GPIO Application */
#define MMA9551_GPIO_POL_MSB		0x08
#define MMA9551_GPIO_POL_LSB		0x09

/* Sleep/Wake application */
#define MMA9551_SLEEP_CFG		0x06
#define MMA9551_SLEEP_CFG_SNCEN		BIT(0)
#define MMA9551_SLEEP_CFG_FLEEN		BIT(1)
#define MMA9551_SLEEP_CFG_SCHEN		BIT(2)

/* AFE application */
#define MMA9551_AFE_X_ACCEL_REG		0x00
#define MMA9551_AFE_Y_ACCEL_REG		0x02
#define MMA9551_AFE_Z_ACCEL_REG		0x04

/* Reset/Suspend/Clear application */
#define MMA9551_RSC_RESET		0x00
#define MMA9551_RSC_OFFSET(mask)	(3 - (ffs(mask) - 1) / 8)
#define MMA9551_RSC_VAL(mask)		(mask >> (((ffs(mask) - 1) / 8) * 8))

/*
 * A response is composed of:
 * - control registers: MB0-3
 * - data registers: MB4-31
 *
 * A request is composed of:
 * - mbox to write to (always 0)
 * - control registers: MB1-4
 * - data registers: MB5-31
 */
#define MMA9551_MAILBOX_CTRL_REGS	4
#define MMA9551_MAX_MAILBOX_DATA_REGS	28
#define MMA9551_MAILBOX_REGS		32

#define MMA9551_I2C_READ_RETRIES	5
#define MMA9551_I2C_READ_DELAY	50	/* us */

struct mma9551_mbox_request {
	u8 start_mbox;		/* Always 0. */
	u8 app_id;
	/*
	 * See Section 5.3.1 of the MMA955xL Software Reference Manual.
	 *
	 * Bit 7: reserved, always 0
	 * Bits 6-4: command
	 * Bits 3-0: upper bits of register offset
	 */
	u8 cmd_off;
	u8 lower_off;
	u8 nbytes;
	u8 buf[MMA9551_MAX_MAILBOX_DATA_REGS - 1];
} __packed;

struct mma9551_mbox_response {
	u8 app_id;
	/*
	 * See Section 5.3.3 of the MMA955xL Software Reference Manual.
	 *
	 * Bit 7: COCO
	 * Bits 6-0: Error code.
	 */
	u8 coco_err;
	u8 nbytes;
	u8 req_bytes;
	u8 buf[MMA9551_MAX_MAILBOX_DATA_REGS];
} __packed;

struct mma9551_version_info {
	__be32 device_id;
	u8 rom_version[2];
	u8 fw_version[2];
	u8 hw_version[2];
	u8 fw_build[2];
};

static int mma9551_transfer(struct i2c_client *client,
			    u8 app_id, u8 command, u16 offset,
			    u8 *inbytes, int num_inbytes,
			    u8 *outbytes, int num_outbytes)
{
	struct mma9551_mbox_request req;
	struct mma9551_mbox_response rsp;
	struct i2c_msg in, out;
	u8 req_len, err_code;
	int ret, retries;

	if (offset >= 1 << 12) {
		dev_err(&client->dev, "register offset too large\n");
		return -EINVAL;
	}

	req_len = 1 + MMA9551_MAILBOX_CTRL_REGS + num_inbytes;
	req.start_mbox = 0;
	req.app_id = app_id;
	req.cmd_off = command | (offset >> 8);
	req.lower_off = offset;

	if (command == MMA9551_CMD_WRITE_CONFIG)
		req.nbytes = num_inbytes;
	else
		req.nbytes = num_outbytes;
	if (num_inbytes)
		memcpy(req.buf, inbytes, num_inbytes);

	out.addr = client->addr;
	out.flags = 0;
	out.len = req_len;
	out.buf = (u8 *)&req;

	ret = i2c_transfer(client->adapter, &out, 1);
	if (ret < 0) {
		dev_err(&client->dev, "i2c write failed\n");
		return ret;
	}

	retries = MMA9551_I2C_READ_RETRIES;
	do {
		udelay(MMA9551_I2C_READ_DELAY);

		in.addr = client->addr;
		in.flags = I2C_M_RD;
		in.len = sizeof(rsp);
		in.buf = (u8 *)&rsp;

		ret = i2c_transfer(client->adapter, &in, 1);
		if (ret < 0) {
			dev_err(&client->dev, "i2c read failed\n");
			return ret;
		}

		if (rsp.coco_err & MMA9551_RESPONSE_COCO)
			break;
	} while (--retries > 0);

	if (retries == 0) {
		dev_err(&client->dev,
			"timed out while waiting for command response\n");
		return -ETIMEDOUT;
	}

	if (rsp.app_id != app_id) {
		dev_err(&client->dev,
			"app_id mismatch in response got %02x expected %02x\n",
			rsp.app_id, app_id);
		return -EINVAL;
	}

	err_code = rsp.coco_err & ~MMA9551_RESPONSE_COCO;
	if (err_code != MMA9551_MCI_ERROR_NONE) {
		dev_err(&client->dev, "read returned error %x\n", err_code);
		return -EINVAL;
	}

	if (rsp.nbytes != rsp.req_bytes) {
		dev_err(&client->dev,
			"output length mismatch got %d expected %d\n",
			rsp.nbytes, rsp.req_bytes);
		return -EINVAL;
	}

	if (num_outbytes)
		memcpy(outbytes, rsp.buf, num_outbytes);

	return 0;
}

/**
 * mma9551_read_config_byte() - read 1 configuration byte
 * @client:	I2C client
 * @app_id:	Application ID
 * @reg:	Application register
 * @val:	Pointer to store value read
 *
 * Read one configuration byte from the device using MMA955xL command format.
 * Commands to the MMA955xL platform consist of a write followed
 * by one or more reads.
 *
 * Locking note: This function must be called with the device lock held.
 * Locking is not handled inside the function. Callers should ensure they
 * serialize access to the HW.
 *
 * Returns: 0 on success, negative value on failure.
 */
int mma9551_read_config_byte(struct i2c_client *client, u8 app_id,
			     u16 reg, u8 *val)
{
	return mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG,
				reg, NULL, 0, val, 1);
}
EXPORT_SYMBOL(mma9551_read_config_byte);

/**
 * mma9551_write_config_byte() - write 1 configuration byte
 * @client:	I2C client
 * @app_id:	Application ID
 * @reg:	Application register
 * @val:	Value to write
 *
 * Write one configuration byte from the device using MMA955xL command format.
 * Commands to the MMA955xL platform consist of a write followed by one or
 * more reads.
 *
 * Locking note: This function must be called with the device lock held.
 * Locking is not handled inside the function. Callers should ensure they
 * serialize access to the HW.
 *
 * Returns: 0 on success, negative value on failure.
 */
int mma9551_write_config_byte(struct i2c_client *client, u8 app_id,
			      u16 reg, u8 val)
{
	return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG, reg,
				&val, 1, NULL, 0);
}
EXPORT_SYMBOL(mma9551_write_config_byte);

/**
 * mma9551_read_status_byte() - read 1 status byte
 * @client:	I2C client
 * @app_id:	Application ID
 * @reg:	Application register
 * @val:	Pointer to store value read
 *
 * Read one status byte from the device using MMA955xL command format.
 * Commands to the MMA955xL platform consist of a write followed by one or
 * more reads.
 *
 * Locking note: This function must be called with the device lock held.
 * Locking is not handled inside the function. Callers should ensure they
 * serialize access to the HW.
 *
 * Returns: 0 on success, negative value on failure.
 */
int mma9551_read_status_byte(struct i2c_client *client, u8 app_id,
			     u16 reg, u8 *val)
{
	return mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
				reg, NULL, 0, val, 1);
}
EXPORT_SYMBOL(mma9551_read_status_byte);

/**
 * mma9551_read_config_word() - read 1 config word
 * @client:	I2C client
 * @app_id:	Application ID
 * @reg:	Application register
 * @val:	Pointer to store value read
 *
 * Read one configuration word from the device using MMA955xL command format.
 * Commands to the MMA955xL platform consist of a write followed by one or
 * more reads.
 *
 * Locking note: This function must be called with the device lock held.
 * Locking is not handled inside the function. Callers should ensure they
 * serialize access to the HW.
 *
 * Returns: 0 on success, negative value on failure.
 */
int mma9551_read_config_word(struct i2c_client *client, u8 app_id,
			    u16 reg, u16 *val)
{
	int ret;
	__be16 v;

	ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG,
			       reg, NULL, 0, (u8 *)&v, 2);
	*val = be16_to_cpu(v);

	return ret;
}
EXPORT_SYMBOL(mma9551_read_config_word);

/**
 * mma9551_write_config_word() - write 1 config word
 * @client:	I2C client
 * @app_id:	Application ID
 * @reg:	Application register
 * @val:	Value to write
 *
 * Write one configuration word from the device using MMA955xL command format.
 * Commands to the MMA955xL platform consist of a write followed by one or
 * more reads.
 *
 * Locking note: This function must be called with the device lock held.
 * Locking is not handled inside the function. Callers should ensure they
 * serialize access to the HW.
 *
 * Returns: 0 on success, negative value on failure.
 */
int mma9551_write_config_word(struct i2c_client *client, u8 app_id,
			     u16 reg, u16 val)
{
	__be16 v = cpu_to_be16(val);

	return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG, reg,
				(u8 *) &v, 2, NULL, 0);
}
EXPORT_SYMBOL(mma9551_write_config_word);

/**
 * mma9551_read_status_word() - read 1 status word
 * @client:	I2C client
 * @app_id:	Application ID
 * @reg:	Application register
 * @val:	Pointer to store value read
 *
 * Read one status word from the device using MMA955xL command format.
 * Commands to the MMA955xL platform consist of a write followed by one or
 * more reads.
 *
 * Locking note: This function must be called with the device lock held.
 * Locking is not handled inside the function. Callers should ensure they
 * serialize access to the HW.
 *
 * Returns: 0 on success, negative value on failure.
 */
int mma9551_read_status_word(struct i2c_client *client, u8 app_id,
			     u16 reg, u16 *val)
{
	int ret;
	__be16 v;

	ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
			       reg, NULL, 0, (u8 *)&v, 2);
	*val = be16_to_cpu(v);

	return ret;
}
EXPORT_SYMBOL(mma9551_read_status_word);

/**
 * mma9551_read_config_words() - read multiple config words
 * @client:	I2C client
 * @app_id:	Application ID
 * @reg:	Application register
 * @len:	Length of array to read in bytes
 * @val:	Array of words to read
 *
 * Read multiple configuration registers (word-sized registers).
 *
 * Locking note: This function must be called with the device lock held.
 * Locking is not handled inside the function. Callers should ensure they
 * serialize access to the HW.
 *
 * Returns: 0 on success, negative value on failure.
 */
int mma9551_read_config_words(struct i2c_client *client, u8 app_id,
			     u16 reg, u8 len, u16 *buf)
{
	int ret, i;
	int len_words = len / sizeof(u16);
	__be16 be_buf[MMA9551_MAX_MAILBOX_DATA_REGS / 2];

	if (len_words > ARRAY_SIZE(be_buf)) {
		dev_err(&client->dev, "Invalid buffer size %d\n", len);
		return -EINVAL;
	}

	ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG,
			       reg, NULL, 0, (u8 *) be_buf, len);
	if (ret < 0)
		return ret;

	for (i = 0; i < len_words; i++)
		buf[i] = be16_to_cpu(be_buf[i]);

	return 0;
}
EXPORT_SYMBOL(mma9551_read_config_words);

/**
 * mma9551_read_status_words() - read multiple status words
 * @client:	I2C client
 * @app_id:	Application ID
 * @reg:	Application register
 * @len:	Length of array to read in bytes
 * @val:	Array of words to read
 *
 * Read multiple status registers (word-sized registers).
 *
 * Locking note: This function must be called with the device lock held.
 * Locking is not handled inside the function. Callers should ensure they
 * serialize access to the HW.
 *
 * Returns: 0 on success, negative value on failure.
 */
int mma9551_read_status_words(struct i2c_client *client, u8 app_id,
			      u16 reg, u8 len, u16 *buf)
{
	int ret, i;
	int len_words = len / sizeof(u16);
	__be16 be_buf[MMA9551_MAX_MAILBOX_DATA_REGS / 2];

	if (len_words > ARRAY_SIZE(be_buf)) {
		dev_err(&client->dev, "Invalid buffer size %d\n", len);
		return -EINVAL;
	}

	ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
			       reg, NULL, 0, (u8 *) be_buf, len);
	if (ret < 0)
		return ret;

	for (i = 0; i < len_words; i++)
		buf[i] = be16_to_cpu(be_buf[i]);

	return 0;
}
EXPORT_SYMBOL(mma9551_read_status_words);

/**
 * mma9551_write_config_words() - write multiple config words
 * @client:	I2C client
 * @app_id:	Application ID
 * @reg:	Application register
 * @len:	Length of array to write in bytes
 * @val:	Array of words to write
 *
 * Write multiple configuration registers (word-sized registers).
 *
 * Locking note: This function must be called with the device lock held.
 * Locking is not handled inside the function. Callers should ensure they
 * serialize access to the HW.
 *
 * Returns: 0 on success, negative value on failure.
 */
int mma9551_write_config_words(struct i2c_client *client, u8 app_id,
			       u16 reg, u8 len, u16 *buf)
{
	int i;
	int len_words = len / sizeof(u16);
	__be16 be_buf[(MMA9551_MAX_MAILBOX_DATA_REGS - 1) / 2];

	if (len_words > ARRAY_SIZE(be_buf)) {
		dev_err(&client->dev, "Invalid buffer size %d\n", len);
		return -EINVAL;
	}

	for (i = 0; i < len_words; i++)
		be_buf[i] = cpu_to_be16(buf[i]);

	return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG,
				reg, (u8 *) be_buf, len, NULL, 0);
}
EXPORT_SYMBOL(mma9551_write_config_words);

/**
 * mma9551_update_config_bits() - update bits in register
 * @client:	I2C client
 * @app_id:	Application ID
 * @reg:	Application register
 * @mask:	Mask for the bits to update
 * @val:	Value of the bits to update
 *
 * Update bits in the given register using a bit mask.
 *
 * Locking note: This function must be called with the device lock held.
 * Locking is not handled inside the function. Callers should ensure they
 * serialize access to the HW.
 *
 * Returns: 0 on success, negative value on failure.
 */
int mma9551_update_config_bits(struct i2c_client *client, u8 app_id,
			       u16 reg, u8 mask, u8 val)
{
	int ret;
	u8 tmp, orig;

	ret = mma9551_read_config_byte(client, app_id, reg, &orig);
	if (ret < 0)
		return ret;

	tmp = orig & ~mask;
	tmp |= val & mask;

	if (tmp == orig)
		return 0;

	return mma9551_write_config_byte(client, app_id, reg, tmp);
}
EXPORT_SYMBOL(mma9551_update_config_bits);

/**
 * mma9551_gpio_config() - configure gpio
 * @client:	I2C client
 * @pin:	GPIO pin to configure
 * @app_id:	Application ID
 * @bitnum:	Bit number of status register being assigned to the GPIO pin.
 * @polarity:	The polarity parameter is described in section 6.2.2, page 66,
 *		of the Software Reference Manual.  Basically, polarity=0 means
 *		the interrupt line has the same value as the selected bit,
 *		while polarity=1 means the line is inverted.
 *
 * Assign a bit from an application’s status register to a specific GPIO pin.
 *
 * Locking note: This function must be called with the device lock held.
 * Locking is not handled inside the function. Callers should ensure they
 * serialize access to the HW.
 *
 * Returns: 0 on success, negative value on failure.
 */
int mma9551_gpio_config(struct i2c_client *client, enum mma9551_gpio_pin pin,
			u8 app_id, u8 bitnum, int polarity)
{
	u8 reg, pol_mask, pol_val;
	int ret;

	if (pin > mma9551_gpio_max) {
		dev_err(&client->dev, "bad GPIO pin\n");
		return -EINVAL;
	}

	/*
	 * Pin 6 is configured by regs 0x00 and 0x01, pin 7 by 0x02 and
	 * 0x03, and so on.
	 */
	reg = pin * 2;

	ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO,
					reg, app_id);
	if (ret < 0) {
		dev_err(&client->dev, "error setting GPIO app_id\n");
		return ret;
	}

	ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO,
					reg + 1, bitnum);
	if (ret < 0) {
		dev_err(&client->dev, "error setting GPIO bit number\n");
		return ret;
	}

	switch (pin) {
	case mma9551_gpio6:
		reg = MMA9551_GPIO_POL_LSB;
		pol_mask = 1 << 6;
		break;
	case mma9551_gpio7:
		reg = MMA9551_GPIO_POL_LSB;
		pol_mask = 1 << 7;
		break;
	case mma9551_gpio8:
		reg = MMA9551_GPIO_POL_MSB;
		pol_mask = 1 << 0;
		break;
	case mma9551_gpio9:
		reg = MMA9551_GPIO_POL_MSB;
		pol_mask = 1 << 1;
		break;
	}
	pol_val = polarity ? pol_mask : 0;

	ret = mma9551_update_config_bits(client, MMA9551_APPID_GPIO, reg,
					 pol_mask, pol_val);
	if (ret < 0)
		dev_err(&client->dev, "error setting GPIO polarity\n");

	return ret;
}
EXPORT_SYMBOL(mma9551_gpio_config);

/**
 * mma9551_read_version() - read device version information
 * @client:	I2C client
 *
 * Read version information and print device id and firmware version.
 *
 * Locking note: This function must be called with the device lock held.
 * Locking is not handled inside the function. Callers should ensure they
 * serialize access to the HW.
 *
 * Returns: 0 on success, negative value on failure.
 */
int mma9551_read_version(struct i2c_client *client)
{
	struct mma9551_version_info info;
	int ret;

	ret = mma9551_transfer(client, MMA9551_APPID_VERSION, 0x00, 0x00,
			       NULL, 0, (u8 *)&info, sizeof(info));
	if (ret < 0)
		return ret;

	dev_info(&client->dev, "device ID 0x%x, firmware version %02x.%02x\n",
		 be32_to_cpu(info.device_id), info.fw_version[0],
		 info.fw_version[1]);

	return 0;
}
EXPORT_SYMBOL(mma9551_read_version);

/**
 * mma9551_set_device_state() - sets HW power mode
 * @client:	I2C client
 * @enable:	Use true to power on device, false to cause the device
 *		to enter sleep.
 *
 * Set power on/off for device using the Sleep/Wake Application.
 * When enable is true, power on chip and enable doze mode.
 * When enable is false, enter sleep mode (device remains in the
 * lowest-power mode).
 *
 * Locking note: This function must be called with the device lock held.
 * Locking is not handled inside the function. Callers should ensure they
 * serialize access to the HW.
 *
 * Returns: 0 on success, negative value on failure.
 */
int mma9551_set_device_state(struct i2c_client *client, bool enable)
{
	return mma9551_update_config_bits(client, MMA9551_APPID_SLEEP_WAKE,
					  MMA9551_SLEEP_CFG,
					  MMA9551_SLEEP_CFG_SNCEN |
					  MMA9551_SLEEP_CFG_FLEEN |
					  MMA9551_SLEEP_CFG_SCHEN,
					  enable ? MMA9551_SLEEP_CFG_SCHEN |
					  MMA9551_SLEEP_CFG_FLEEN :
					  MMA9551_SLEEP_CFG_SNCEN);
}
EXPORT_SYMBOL(mma9551_set_device_state);

/**
 * mma9551_set_power_state() - sets runtime PM state
 * @client:	I2C client
 * @on:		Use true to power on device, false to power off
 *
 * Resume or suspend the device using Runtime PM.
 * The device will suspend after the autosuspend delay.
 *
 * Returns: 0 on success, negative value on failure.
 */
int mma9551_set_power_state(struct i2c_client *client, bool on)
{
#ifdef CONFIG_PM
	int ret;

	if (on)
		ret = pm_runtime_get_sync(&client->dev);
	else {
		pm_runtime_mark_last_busy(&client->dev);
		ret = pm_runtime_put_autosuspend(&client->dev);
	}

	if (ret < 0) {
		dev_err(&client->dev,
			"failed to change power state to %d\n", on);
		if (on)
			pm_runtime_put_noidle(&client->dev);

		return ret;
	}
#endif

	return 0;
}
EXPORT_SYMBOL(mma9551_set_power_state);

/**
 * mma9551_sleep() - sleep
 * @freq:	Application frequency
 *
 * Firmware applications run at a certain frequency on the
 * device. Sleep for one application cycle to make sure the
 * application had time to run once and initialize set values.
 */
void mma9551_sleep(int freq)
{
	int sleep_val = 1000 / freq;

	if (sleep_val < 20)
		usleep_range(sleep_val * 1000, 20000);
	else
		msleep_interruptible(sleep_val);
}
EXPORT_SYMBOL(mma9551_sleep);

/**
 * mma9551_read_accel_chan() - read accelerometer channel
 * @client:	I2C client
 * @chan:	IIO channel
 * @val:	Pointer to the accelerometer value read
 * @val2:	Unused
 *
 * Read accelerometer value for the specified channel.
 *
 * Locking note: This function must be called with the device lock held.
 * Locking is not handled inside the function. Callers should ensure they
 * serialize access to the HW.
 *
 * Returns: IIO_VAL_INT on success, negative value on failure.
 */
int mma9551_read_accel_chan(struct i2c_client *client,
			    const struct iio_chan_spec *chan,
			    int *val, int *val2)
{
	u16 reg_addr;
	s16 raw_accel;
	int ret;

	switch (chan->channel2) {
	case IIO_MOD_X:
		reg_addr = MMA9551_AFE_X_ACCEL_REG;
		break;
	case IIO_MOD_Y:
		reg_addr = MMA9551_AFE_Y_ACCEL_REG;
		break;
	case IIO_MOD_Z:
		reg_addr = MMA9551_AFE_Z_ACCEL_REG;
		break;
	default:
		return -EINVAL;
	}

	ret = mma9551_set_power_state(client, true);
	if (ret < 0)
		return ret;

	ret = mma9551_read_status_word(client, MMA9551_APPID_AFE,
				       reg_addr, &raw_accel);
	if (ret < 0)
		goto out_poweroff;

	*val = raw_accel;

	ret = IIO_VAL_INT;

out_poweroff:
	mma9551_set_power_state(client, false);
	return ret;
}
EXPORT_SYMBOL(mma9551_read_accel_chan);

/**
 * mma9551_read_accel_scale() - read accelerometer scale
 * @val:	Pointer to the accelerometer scale (int value)
 * @val2:	Pointer to the accelerometer scale (micro value)
 *
 * Read accelerometer scale.
 *
 * Returns: IIO_VAL_INT_PLUS_MICRO.
 */
int mma9551_read_accel_scale(int *val, int *val2)
{
	*val = 0;
	*val2 = 2440;

	return IIO_VAL_INT_PLUS_MICRO;
}
EXPORT_SYMBOL(mma9551_read_accel_scale);

/**
 * mma9551_app_reset() - reset application
 * @client:	I2C client
 * @app_mask:	Application to reset
 *
 * Reset the given application (using the Reset/Suspend/Clear
 * Control Application)
 *
 * Returns: 0 on success, negative value on failure.
 */
int mma9551_app_reset(struct i2c_client *client, u32 app_mask)
{
	return mma9551_write_config_byte(client, MMA9551_APPID_RCS,
					 MMA9551_RSC_RESET +
					 MMA9551_RSC_OFFSET(app_mask),
					 MMA9551_RSC_VAL(app_mask));
}
EXPORT_SYMBOL(mma9551_app_reset);

MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MMA955xL sensors core");