tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Copyright (c) 2011 Bosch Sensortec GmbH
3 * Copyright (c) 2011 Unixphere
4 *
5 * This driver adds support for Bosch Sensortec's digital acceleration
6 * sensors BMA150 and SMB380.
7 * The SMB380 is fully compatible with BMA150 and only differs in packaging.
8 *
9 * The datasheet for the BMA150 chip can be found here:
10 * http://www.bosch-sensortec.com/content/language1/downloads/BST-BMA150-DS000-07.pdf
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 */
26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/i2c.h>
29#include <linux/input.h>
30#include <linux/input-polldev.h>
31#include <linux/interrupt.h>
32#include <linux/delay.h>
33#include <linux/slab.h>
34#include <linux/pm.h>
35#include <linux/pm_runtime.h>
36#include <linux/bma150.h>
37
38#define ABSMAX_ACC_VAL 0x01FF
39#define ABSMIN_ACC_VAL -(ABSMAX_ACC_VAL)
40
41/* Each axis is represented by a 2-byte data word */
42#define BMA150_XYZ_DATA_SIZE 6
43
44/* Input poll interval in milliseconds */
45#define BMA150_POLL_INTERVAL 10
46#define BMA150_POLL_MAX 200
47#define BMA150_POLL_MIN 0
48
49#define BMA150_BW_25HZ 0
50#define BMA150_BW_50HZ 1
51#define BMA150_BW_100HZ 2
52#define BMA150_BW_190HZ 3
53#define BMA150_BW_375HZ 4
54#define BMA150_BW_750HZ 5
55#define BMA150_BW_1500HZ 6
56
57#define BMA150_RANGE_2G 0
58#define BMA150_RANGE_4G 1
59#define BMA150_RANGE_8G 2
60
61#define BMA150_MODE_NORMAL 0
62#define BMA150_MODE_SLEEP 2
63#define BMA150_MODE_WAKE_UP 3
64
65/* Data register addresses */
66#define BMA150_DATA_0_REG 0x00
67#define BMA150_DATA_1_REG 0x01
68#define BMA150_DATA_2_REG 0x02
69
70/* Control register addresses */
71#define BMA150_CTRL_0_REG 0x0A
72#define BMA150_CTRL_1_REG 0x0B
73#define BMA150_CTRL_2_REG 0x14
74#define BMA150_CTRL_3_REG 0x15
75
76/* Configuration/Setting register addresses */
77#define BMA150_CFG_0_REG 0x0C
78#define BMA150_CFG_1_REG 0x0D
79#define BMA150_CFG_2_REG 0x0E
80#define BMA150_CFG_3_REG 0x0F
81#define BMA150_CFG_4_REG 0x10
82#define BMA150_CFG_5_REG 0x11
83
84#define BMA150_CHIP_ID 2
85#define BMA150_CHIP_ID_REG BMA150_DATA_0_REG
86
87#define BMA150_ACC_X_LSB_REG BMA150_DATA_2_REG
88
89#define BMA150_SLEEP_POS 0
90#define BMA150_SLEEP_MSK 0x01
91#define BMA150_SLEEP_REG BMA150_CTRL_0_REG
92
93#define BMA150_BANDWIDTH_POS 0
94#define BMA150_BANDWIDTH_MSK 0x07
95#define BMA150_BANDWIDTH_REG BMA150_CTRL_2_REG
96
97#define BMA150_RANGE_POS 3
98#define BMA150_RANGE_MSK 0x18
99#define BMA150_RANGE_REG BMA150_CTRL_2_REG
100
101#define BMA150_WAKE_UP_POS 0
102#define BMA150_WAKE_UP_MSK 0x01
103#define BMA150_WAKE_UP_REG BMA150_CTRL_3_REG
104
105#define BMA150_SW_RES_POS 1
106#define BMA150_SW_RES_MSK 0x02
107#define BMA150_SW_RES_REG BMA150_CTRL_0_REG
108
109/* Any-motion interrupt register fields */
110#define BMA150_ANY_MOTION_EN_POS 6
111#define BMA150_ANY_MOTION_EN_MSK 0x40
112#define BMA150_ANY_MOTION_EN_REG BMA150_CTRL_1_REG
113
114#define BMA150_ANY_MOTION_DUR_POS 6
115#define BMA150_ANY_MOTION_DUR_MSK 0xC0
116#define BMA150_ANY_MOTION_DUR_REG BMA150_CFG_5_REG
117
118#define BMA150_ANY_MOTION_THRES_REG BMA150_CFG_4_REG
119
120/* Advanced interrupt register fields */
121#define BMA150_ADV_INT_EN_POS 6
122#define BMA150_ADV_INT_EN_MSK 0x40
123#define BMA150_ADV_INT_EN_REG BMA150_CTRL_3_REG
124
125/* High-G interrupt register fields */
126#define BMA150_HIGH_G_EN_POS 1
127#define BMA150_HIGH_G_EN_MSK 0x02
128#define BMA150_HIGH_G_EN_REG BMA150_CTRL_1_REG
129
130#define BMA150_HIGH_G_HYST_POS 3
131#define BMA150_HIGH_G_HYST_MSK 0x38
132#define BMA150_HIGH_G_HYST_REG BMA150_CFG_5_REG
133
134#define BMA150_HIGH_G_DUR_REG BMA150_CFG_3_REG
135#define BMA150_HIGH_G_THRES_REG BMA150_CFG_2_REG
136
137/* Low-G interrupt register fields */
138#define BMA150_LOW_G_EN_POS 0
139#define BMA150_LOW_G_EN_MSK 0x01
140#define BMA150_LOW_G_EN_REG BMA150_CTRL_1_REG
141
142#define BMA150_LOW_G_HYST_POS 0
143#define BMA150_LOW_G_HYST_MSK 0x07
144#define BMA150_LOW_G_HYST_REG BMA150_CFG_5_REG
145
146#define BMA150_LOW_G_DUR_REG BMA150_CFG_1_REG
147#define BMA150_LOW_G_THRES_REG BMA150_CFG_0_REG
148
149struct bma150_data {
150 struct i2c_client *client;
151 struct input_polled_dev *input_polled;
152 struct input_dev *input;
153 u8 mode;
154};
155
156/*
157 * The settings for the given range, bandwidth and interrupt features
158 * are stated and verified by Bosch Sensortec where they are configured
159 * to provide a generic sensitivity performance.
160 */
161static struct bma150_cfg default_cfg __devinitdata = {
162 .any_motion_int = 1,
163 .hg_int = 1,
164 .lg_int = 1,
165 .any_motion_dur = 0,
166 .any_motion_thres = 0,
167 .hg_hyst = 0,
168 .hg_dur = 150,
169 .hg_thres = 160,
170 .lg_hyst = 0,
171 .lg_dur = 150,
172 .lg_thres = 20,
173 .range = BMA150_RANGE_2G,
174 .bandwidth = BMA150_BW_50HZ
175};
176
177static int bma150_write_byte(struct i2c_client *client, u8 reg, u8 val)
178{
179 s32 ret;
180
181 /* As per specification, disable irq in between register writes */
182 if (client->irq)
183 disable_irq_nosync(client->irq);
184
185 ret = i2c_smbus_write_byte_data(client, reg, val);
186
187 if (client->irq)
188 enable_irq(client->irq);
189
190 return ret;
191}
192
193static int bma150_set_reg_bits(struct i2c_client *client,
194 int val, int shift, u8 mask, u8 reg)
195{
196 int data;
197
198 data = i2c_smbus_read_byte_data(client, reg);
199 if (data < 0)
200 return data;
201
202 data = (data & ~mask) | ((val << shift) & mask);
203 return bma150_write_byte(client, reg, data);
204}
205
206static int bma150_set_mode(struct bma150_data *bma150, u8 mode)
207{
208 int error;
209
210 error = bma150_set_reg_bits(bma150->client, mode, BMA150_WAKE_UP_POS,
211 BMA150_WAKE_UP_MSK, BMA150_WAKE_UP_REG);
212 if (error)
213 return error;
214
215 error = bma150_set_reg_bits(bma150->client, mode, BMA150_SLEEP_POS,
216 BMA150_SLEEP_MSK, BMA150_SLEEP_REG);
217 if (error)
218 return error;
219
220 if (mode == BMA150_MODE_NORMAL)
221 msleep(2);
222
223 bma150->mode = mode;
224 return 0;
225}
226
227static int __devinit bma150_soft_reset(struct bma150_data *bma150)
228{
229 int error;
230
231 error = bma150_set_reg_bits(bma150->client, 1, BMA150_SW_RES_POS,
232 BMA150_SW_RES_MSK, BMA150_SW_RES_REG);
233 if (error)
234 return error;
235
236 msleep(2);
237 return 0;
238}
239
240static int __devinit bma150_set_range(struct bma150_data *bma150, u8 range)
241{
242 return bma150_set_reg_bits(bma150->client, range, BMA150_RANGE_POS,
243 BMA150_RANGE_MSK, BMA150_RANGE_REG);
244}
245
246static int __devinit bma150_set_bandwidth(struct bma150_data *bma150, u8 bw)
247{
248 return bma150_set_reg_bits(bma150->client, bw, BMA150_BANDWIDTH_POS,
249 BMA150_BANDWIDTH_MSK, BMA150_BANDWIDTH_REG);
250}
251
252static int __devinit bma150_set_low_g_interrupt(struct bma150_data *bma150,
253 u8 enable, u8 hyst, u8 dur, u8 thres)
254{
255 int error;
256
257 error = bma150_set_reg_bits(bma150->client, hyst,
258 BMA150_LOW_G_HYST_POS, BMA150_LOW_G_HYST_MSK,
259 BMA150_LOW_G_HYST_REG);
260 if (error)
261 return error;
262
263 error = bma150_write_byte(bma150->client, BMA150_LOW_G_DUR_REG, dur);
264 if (error)
265 return error;
266
267 error = bma150_write_byte(bma150->client, BMA150_LOW_G_THRES_REG, thres);
268 if (error)
269 return error;
270
271 return bma150_set_reg_bits(bma150->client, !!enable,
272 BMA150_LOW_G_EN_POS, BMA150_LOW_G_EN_MSK,
273 BMA150_LOW_G_EN_REG);
274}
275
276static int __devinit bma150_set_high_g_interrupt(struct bma150_data *bma150,
277 u8 enable, u8 hyst, u8 dur, u8 thres)
278{
279 int error;
280
281 error = bma150_set_reg_bits(bma150->client, hyst,
282 BMA150_HIGH_G_HYST_POS, BMA150_HIGH_G_HYST_MSK,
283 BMA150_HIGH_G_HYST_REG);
284 if (error)
285 return error;
286
287 error = bma150_write_byte(bma150->client,
288 BMA150_HIGH_G_DUR_REG, dur);
289 if (error)
290 return error;
291
292 error = bma150_write_byte(bma150->client,
293 BMA150_HIGH_G_THRES_REG, thres);
294 if (error)
295 return error;
296
297 return bma150_set_reg_bits(bma150->client, !!enable,
298 BMA150_HIGH_G_EN_POS, BMA150_HIGH_G_EN_MSK,
299 BMA150_HIGH_G_EN_REG);
300}
301
302
303static int __devinit bma150_set_any_motion_interrupt(struct bma150_data *bma150,
304 u8 enable, u8 dur, u8 thres)
305{
306 int error;
307
308 error = bma150_set_reg_bits(bma150->client, dur,
309 BMA150_ANY_MOTION_DUR_POS,
310 BMA150_ANY_MOTION_DUR_MSK,
311 BMA150_ANY_MOTION_DUR_REG);
312 if (error)
313 return error;
314
315 error = bma150_write_byte(bma150->client,
316 BMA150_ANY_MOTION_THRES_REG, thres);
317 if (error)
318 return error;
319
320 error = bma150_set_reg_bits(bma150->client, !!enable,
321 BMA150_ADV_INT_EN_POS, BMA150_ADV_INT_EN_MSK,
322 BMA150_ADV_INT_EN_REG);
323 if (error)
324 return error;
325
326 return bma150_set_reg_bits(bma150->client, !!enable,
327 BMA150_ANY_MOTION_EN_POS,
328 BMA150_ANY_MOTION_EN_MSK,
329 BMA150_ANY_MOTION_EN_REG);
330}
331
332static void bma150_report_xyz(struct bma150_data *bma150)
333{
334 u8 data[BMA150_XYZ_DATA_SIZE];
335 s16 x, y, z;
336 s32 ret;
337
338 ret = i2c_smbus_read_i2c_block_data(bma150->client,
339 BMA150_ACC_X_LSB_REG, BMA150_XYZ_DATA_SIZE, data);
340 if (ret != BMA150_XYZ_DATA_SIZE)
341 return;
342
343 x = ((0xc0 & data[0]) >> 6) | (data[1] << 2);
344 y = ((0xc0 & data[2]) >> 6) | (data[3] << 2);
345 z = ((0xc0 & data[4]) >> 6) | (data[5] << 2);
346
347 /* sign extension */
348 x = (s16) (x << 6) >> 6;
349 y = (s16) (y << 6) >> 6;
350 z = (s16) (z << 6) >> 6;
351
352 input_report_abs(bma150->input, ABS_X, x);
353 input_report_abs(bma150->input, ABS_Y, y);
354 input_report_abs(bma150->input, ABS_Z, z);
355 input_sync(bma150->input);
356}
357
358static irqreturn_t bma150_irq_thread(int irq, void *dev)
359{
360 bma150_report_xyz(dev);
361
362 return IRQ_HANDLED;
363}
364
365static void bma150_poll(struct input_polled_dev *dev)
366{
367 bma150_report_xyz(dev->private);
368}
369
370static int bma150_open(struct bma150_data *bma150)
371{
372 int error;
373
374 error = pm_runtime_get_sync(&bma150->client->dev);
375 if (error && error != -ENOSYS)
376 return error;
377
378 /*
379 * See if runtime PM woke up the device. If runtime PM
380 * is disabled we need to do it ourselves.
381 */
382 if (bma150->mode != BMA150_MODE_NORMAL) {
383 error = bma150_set_mode(bma150, BMA150_MODE_NORMAL);
384 if (error)
385 return error;
386 }
387
388 return 0;
389}
390
391static void bma150_close(struct bma150_data *bma150)
392{
393 pm_runtime_put_sync(&bma150->client->dev);
394
395 if (bma150->mode != BMA150_MODE_SLEEP)
396 bma150_set_mode(bma150, BMA150_MODE_SLEEP);
397}
398
399static int bma150_irq_open(struct input_dev *input)
400{
401 struct bma150_data *bma150 = input_get_drvdata(input);
402
403 return bma150_open(bma150);
404}
405
406static void bma150_irq_close(struct input_dev *input)
407{
408 struct bma150_data *bma150 = input_get_drvdata(input);
409
410 bma150_close(bma150);
411}
412
413static void bma150_poll_open(struct input_polled_dev *ipoll_dev)
414{
415 struct bma150_data *bma150 = ipoll_dev->private;
416
417 bma150_open(bma150);
418}
419
420static void bma150_poll_close(struct input_polled_dev *ipoll_dev)
421{
422 struct bma150_data *bma150 = ipoll_dev->private;
423
424 bma150_close(bma150);
425}
426
427static int __devinit bma150_initialize(struct bma150_data *bma150,
428 const struct bma150_cfg *cfg)
429{
430 int error;
431
432 error = bma150_soft_reset(bma150);
433 if (error)
434 return error;
435
436 error = bma150_set_bandwidth(bma150, cfg->bandwidth);
437 if (error)
438 return error;
439
440 error = bma150_set_range(bma150, cfg->range);
441 if (error)
442 return error;
443
444 if (bma150->client->irq) {
445 error = bma150_set_any_motion_interrupt(bma150,
446 cfg->any_motion_int,
447 cfg->any_motion_dur,
448 cfg->any_motion_thres);
449 if (error)
450 return error;
451
452 error = bma150_set_high_g_interrupt(bma150,
453 cfg->hg_int, cfg->hg_hyst,
454 cfg->hg_dur, cfg->hg_thres);
455 if (error)
456 return error;
457
458 error = bma150_set_low_g_interrupt(bma150,
459 cfg->lg_int, cfg->lg_hyst,
460 cfg->lg_dur, cfg->lg_thres);
461 if (error)
462 return error;
463 }
464
465 return bma150_set_mode(bma150, BMA150_MODE_SLEEP);
466}
467
468static void __devinit bma150_init_input_device(struct bma150_data *bma150,
469 struct input_dev *idev)
470{
471 idev->name = BMA150_DRIVER;
472 idev->phys = BMA150_DRIVER "/input0";
473 idev->id.bustype = BUS_I2C;
474 idev->dev.parent = &bma150->client->dev;
475
476 idev->evbit[0] = BIT_MASK(EV_ABS);
477 input_set_abs_params(idev, ABS_X, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
478 input_set_abs_params(idev, ABS_Y, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
479 input_set_abs_params(idev, ABS_Z, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
480}
481
482static int __devinit bma150_register_input_device(struct bma150_data *bma150)
483{
484 struct input_dev *idev;
485 int error;
486
487 idev = input_allocate_device();
488 if (!idev)
489 return -ENOMEM;
490
491 bma150_init_input_device(bma150, idev);
492
493 idev->open = bma150_irq_open;
494 idev->close = bma150_irq_close;
495 input_set_drvdata(idev, bma150);
496
497 error = input_register_device(idev);
498 if (error) {
499 input_free_device(idev);
500 return error;
501 }
502
503 bma150->input = idev;
504 return 0;
505}
506
507static int __devinit bma150_register_polled_device(struct bma150_data *bma150)
508{
509 struct input_polled_dev *ipoll_dev;
510 int error;
511
512 ipoll_dev = input_allocate_polled_device();
513 if (!ipoll_dev)
514 return -ENOMEM;
515
516 ipoll_dev->private = bma150;
517 ipoll_dev->open = bma150_poll_open;
518 ipoll_dev->close = bma150_poll_close;
519 ipoll_dev->poll = bma150_poll;
520 ipoll_dev->poll_interval = BMA150_POLL_INTERVAL;
521 ipoll_dev->poll_interval_min = BMA150_POLL_MIN;
522 ipoll_dev->poll_interval_max = BMA150_POLL_MAX;
523
524 bma150_init_input_device(bma150, ipoll_dev->input);
525
526 error = input_register_polled_device(ipoll_dev);
527 if (error) {
528 input_free_polled_device(ipoll_dev);
529 return error;
530 }
531
532 bma150->input_polled = ipoll_dev;
533 bma150->input = ipoll_dev->input;
534
535 return 0;
536}
537
538static int __devinit bma150_probe(struct i2c_client *client,
539 const struct i2c_device_id *id)
540{
541 const struct bma150_platform_data *pdata = client->dev.platform_data;
542 const struct bma150_cfg *cfg;
543 struct bma150_data *bma150;
544 int chip_id;
545 int error;
546
547 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
548 dev_err(&client->dev, "i2c_check_functionality error\n");
549 return -EIO;
550 }
551
552 chip_id = i2c_smbus_read_byte_data(client, BMA150_CHIP_ID_REG);
553 if (chip_id != BMA150_CHIP_ID) {
554 dev_err(&client->dev, "BMA150 chip id error: %d\n", chip_id);
555 return -EINVAL;
556 }
557
558 bma150 = kzalloc(sizeof(struct bma150_data), GFP_KERNEL);
559 if (!bma150)
560 return -ENOMEM;
561
562 bma150->client = client;
563
564 if (pdata) {
565 if (pdata->irq_gpio_cfg) {
566 error = pdata->irq_gpio_cfg();
567 if (error) {
568 dev_err(&client->dev,
569 "IRQ GPIO conf. error %d, error %d\n",
570 client->irq, error);
571 goto err_free_mem;
572 }
573 }
574 cfg = &pdata->cfg;
575 } else {
576 cfg = &default_cfg;
577 }
578
579 error = bma150_initialize(bma150, cfg);
580 if (error)
581 goto err_free_mem;
582
583 if (client->irq > 0) {
584 error = bma150_register_input_device(bma150);
585 if (error)
586 goto err_free_mem;
587
588 error = request_threaded_irq(client->irq,
589 NULL, bma150_irq_thread,
590 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
591 BMA150_DRIVER, bma150);
592 if (error) {
593 dev_err(&client->dev,
594 "irq request failed %d, error %d\n",
595 client->irq, error);
596 input_unregister_device(bma150->input);
597 goto err_free_mem;
598 }
599 } else {
600 error = bma150_register_polled_device(bma150);
601 if (error)
602 goto err_free_mem;
603 }
604
605 i2c_set_clientdata(client, bma150);
606
607 pm_runtime_enable(&client->dev);
608
609 return 0;
610
611err_free_mem:
612 kfree(bma150);
613 return error;
614}
615
616static int __devexit bma150_remove(struct i2c_client *client)
617{
618 struct bma150_data *bma150 = i2c_get_clientdata(client);
619
620 pm_runtime_disable(&client->dev);
621
622 if (client->irq > 0) {
623 free_irq(client->irq, bma150);
624 input_unregister_device(bma150->input);
625 } else {
626 input_unregister_polled_device(bma150->input_polled);
627 input_free_polled_device(bma150->input_polled);
628 }
629
630 kfree(bma150);
631
632 return 0;
633}
634
635#ifdef CONFIG_PM
636static int bma150_suspend(struct device *dev)
637{
638 struct i2c_client *client = to_i2c_client(dev);
639 struct bma150_data *bma150 = i2c_get_clientdata(client);
640
641 return bma150_set_mode(bma150, BMA150_MODE_SLEEP);
642}
643
644static int bma150_resume(struct device *dev)
645{
646 struct i2c_client *client = to_i2c_client(dev);
647 struct bma150_data *bma150 = i2c_get_clientdata(client);
648
649 return bma150_set_mode(bma150, BMA150_MODE_NORMAL);
650}
651#endif
652
653static UNIVERSAL_DEV_PM_OPS(bma150_pm, bma150_suspend, bma150_resume, NULL);
654
655static const struct i2c_device_id bma150_id[] = {
656 { "bma150", 0 },
657 { "smb380", 0 },
658 { "bma023", 0 },
659 { }
660};
661
662MODULE_DEVICE_TABLE(i2c, bma150_id);
663
664static struct i2c_driver bma150_driver = {
665 .driver = {
666 .owner = THIS_MODULE,
667 .name = BMA150_DRIVER,
668 .pm = &bma150_pm,
669 },
670 .class = I2C_CLASS_HWMON,
671 .id_table = bma150_id,
672 .probe = bma150_probe,
673 .remove = __devexit_p(bma150_remove),
674};
675
676module_i2c_driver(bma150_driver);
677
678MODULE_AUTHOR("Albert Zhang <xu.zhang@bosch-sensortec.com>");
679MODULE_DESCRIPTION("BMA150 driver");
680MODULE_LICENSE("GPL");