Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / input / misc / bma150.c
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_MODE_NORMAL      0
50 #define BMA150_MODE_SLEEP       2
51 #define BMA150_MODE_WAKE_UP     3
52
53 /* Data register addresses */
54 #define BMA150_DATA_0_REG       0x00
55 #define BMA150_DATA_1_REG       0x01
56 #define BMA150_DATA_2_REG       0x02
57
58 /* Control register addresses */
59 #define BMA150_CTRL_0_REG       0x0A
60 #define BMA150_CTRL_1_REG       0x0B
61 #define BMA150_CTRL_2_REG       0x14
62 #define BMA150_CTRL_3_REG       0x15
63
64 /* Configuration/Setting register addresses */
65 #define BMA150_CFG_0_REG        0x0C
66 #define BMA150_CFG_1_REG        0x0D
67 #define BMA150_CFG_2_REG        0x0E
68 #define BMA150_CFG_3_REG        0x0F
69 #define BMA150_CFG_4_REG        0x10
70 #define BMA150_CFG_5_REG        0x11
71
72 #define BMA150_CHIP_ID          2
73 #define BMA180_CHIP_ID          3
74 #define BMA150_CHIP_ID_REG      BMA150_DATA_0_REG
75
76 #define BMA150_ACC_X_LSB_REG    BMA150_DATA_2_REG
77
78 #define BMA150_SLEEP_POS        0
79 #define BMA150_SLEEP_MSK        0x01
80 #define BMA150_SLEEP_REG        BMA150_CTRL_0_REG
81
82 #define BMA150_BANDWIDTH_POS    0
83 #define BMA150_BANDWIDTH_MSK    0x07
84 #define BMA150_BANDWIDTH_REG    BMA150_CTRL_2_REG
85
86 #define BMA150_RANGE_POS        3
87 #define BMA150_RANGE_MSK        0x18
88 #define BMA150_RANGE_REG        BMA150_CTRL_2_REG
89
90 #define BMA150_WAKE_UP_POS      0
91 #define BMA150_WAKE_UP_MSK      0x01
92 #define BMA150_WAKE_UP_REG      BMA150_CTRL_3_REG
93
94 #define BMA150_SW_RES_POS       1
95 #define BMA150_SW_RES_MSK       0x02
96 #define BMA150_SW_RES_REG       BMA150_CTRL_0_REG
97
98 /* Any-motion interrupt register fields */
99 #define BMA150_ANY_MOTION_EN_POS        6
100 #define BMA150_ANY_MOTION_EN_MSK        0x40
101 #define BMA150_ANY_MOTION_EN_REG        BMA150_CTRL_1_REG
102
103 #define BMA150_ANY_MOTION_DUR_POS       6
104 #define BMA150_ANY_MOTION_DUR_MSK       0xC0
105 #define BMA150_ANY_MOTION_DUR_REG       BMA150_CFG_5_REG
106
107 #define BMA150_ANY_MOTION_THRES_REG     BMA150_CFG_4_REG
108
109 /* Advanced interrupt register fields */
110 #define BMA150_ADV_INT_EN_POS           6
111 #define BMA150_ADV_INT_EN_MSK           0x40
112 #define BMA150_ADV_INT_EN_REG           BMA150_CTRL_3_REG
113
114 /* High-G interrupt register fields */
115 #define BMA150_HIGH_G_EN_POS            1
116 #define BMA150_HIGH_G_EN_MSK            0x02
117 #define BMA150_HIGH_G_EN_REG            BMA150_CTRL_1_REG
118
119 #define BMA150_HIGH_G_HYST_POS          3
120 #define BMA150_HIGH_G_HYST_MSK          0x38
121 #define BMA150_HIGH_G_HYST_REG          BMA150_CFG_5_REG
122
123 #define BMA150_HIGH_G_DUR_REG           BMA150_CFG_3_REG
124 #define BMA150_HIGH_G_THRES_REG         BMA150_CFG_2_REG
125
126 /* Low-G interrupt register fields */
127 #define BMA150_LOW_G_EN_POS             0
128 #define BMA150_LOW_G_EN_MSK             0x01
129 #define BMA150_LOW_G_EN_REG             BMA150_CTRL_1_REG
130
131 #define BMA150_LOW_G_HYST_POS           0
132 #define BMA150_LOW_G_HYST_MSK           0x07
133 #define BMA150_LOW_G_HYST_REG           BMA150_CFG_5_REG
134
135 #define BMA150_LOW_G_DUR_REG            BMA150_CFG_1_REG
136 #define BMA150_LOW_G_THRES_REG          BMA150_CFG_0_REG
137
138 struct bma150_data {
139         struct i2c_client *client;
140         struct input_polled_dev *input_polled;
141         struct input_dev *input;
142         u8 mode;
143 };
144
145 /*
146  * The settings for the given range, bandwidth and interrupt features
147  * are stated and verified by Bosch Sensortec where they are configured
148  * to provide a generic sensitivity performance.
149  */
150 static struct bma150_cfg default_cfg = {
151         .any_motion_int = 1,
152         .hg_int = 1,
153         .lg_int = 1,
154         .any_motion_dur = 0,
155         .any_motion_thres = 0,
156         .hg_hyst = 0,
157         .hg_dur = 150,
158         .hg_thres = 160,
159         .lg_hyst = 0,
160         .lg_dur = 150,
161         .lg_thres = 20,
162         .range = BMA150_RANGE_2G,
163         .bandwidth = BMA150_BW_50HZ
164 };
165
166 static int bma150_write_byte(struct i2c_client *client, u8 reg, u8 val)
167 {
168         s32 ret;
169
170         /* As per specification, disable irq in between register writes */
171         if (client->irq)
172                 disable_irq_nosync(client->irq);
173
174         ret = i2c_smbus_write_byte_data(client, reg, val);
175
176         if (client->irq)
177                 enable_irq(client->irq);
178
179         return ret;
180 }
181
182 static int bma150_set_reg_bits(struct i2c_client *client,
183                                         int val, int shift, u8 mask, u8 reg)
184 {
185         int data;
186
187         data = i2c_smbus_read_byte_data(client, reg);
188         if (data < 0)
189                 return data;
190
191         data = (data & ~mask) | ((val << shift) & mask);
192         return bma150_write_byte(client, reg, data);
193 }
194
195 static int bma150_set_mode(struct bma150_data *bma150, u8 mode)
196 {
197         int error;
198
199         error = bma150_set_reg_bits(bma150->client, mode, BMA150_WAKE_UP_POS,
200                                 BMA150_WAKE_UP_MSK, BMA150_WAKE_UP_REG);
201         if (error)
202                 return error;
203
204         error = bma150_set_reg_bits(bma150->client, mode, BMA150_SLEEP_POS,
205                                 BMA150_SLEEP_MSK, BMA150_SLEEP_REG);
206         if (error)
207                 return error;
208
209         if (mode == BMA150_MODE_NORMAL)
210                 msleep(2);
211
212         bma150->mode = mode;
213         return 0;
214 }
215
216 static int bma150_soft_reset(struct bma150_data *bma150)
217 {
218         int error;
219
220         error = bma150_set_reg_bits(bma150->client, 1, BMA150_SW_RES_POS,
221                                 BMA150_SW_RES_MSK, BMA150_SW_RES_REG);
222         if (error)
223                 return error;
224
225         msleep(2);
226         return 0;
227 }
228
229 static int bma150_set_range(struct bma150_data *bma150, u8 range)
230 {
231         return bma150_set_reg_bits(bma150->client, range, BMA150_RANGE_POS,
232                                 BMA150_RANGE_MSK, BMA150_RANGE_REG);
233 }
234
235 static int bma150_set_bandwidth(struct bma150_data *bma150, u8 bw)
236 {
237         return bma150_set_reg_bits(bma150->client, bw, BMA150_BANDWIDTH_POS,
238                                 BMA150_BANDWIDTH_MSK, BMA150_BANDWIDTH_REG);
239 }
240
241 static int bma150_set_low_g_interrupt(struct bma150_data *bma150,
242                                         u8 enable, u8 hyst, u8 dur, u8 thres)
243 {
244         int error;
245
246         error = bma150_set_reg_bits(bma150->client, hyst,
247                                 BMA150_LOW_G_HYST_POS, BMA150_LOW_G_HYST_MSK,
248                                 BMA150_LOW_G_HYST_REG);
249         if (error)
250                 return error;
251
252         error = bma150_write_byte(bma150->client, BMA150_LOW_G_DUR_REG, dur);
253         if (error)
254                 return error;
255
256         error = bma150_write_byte(bma150->client, BMA150_LOW_G_THRES_REG, thres);
257         if (error)
258                 return error;
259
260         return bma150_set_reg_bits(bma150->client, !!enable,
261                                 BMA150_LOW_G_EN_POS, BMA150_LOW_G_EN_MSK,
262                                 BMA150_LOW_G_EN_REG);
263 }
264
265 static int bma150_set_high_g_interrupt(struct bma150_data *bma150,
266                                         u8 enable, u8 hyst, u8 dur, u8 thres)
267 {
268         int error;
269
270         error = bma150_set_reg_bits(bma150->client, hyst,
271                                 BMA150_HIGH_G_HYST_POS, BMA150_HIGH_G_HYST_MSK,
272                                 BMA150_HIGH_G_HYST_REG);
273         if (error)
274                 return error;
275
276         error = bma150_write_byte(bma150->client,
277                                 BMA150_HIGH_G_DUR_REG, dur);
278         if (error)
279                 return error;
280
281         error = bma150_write_byte(bma150->client,
282                                 BMA150_HIGH_G_THRES_REG, thres);
283         if (error)
284                 return error;
285
286         return bma150_set_reg_bits(bma150->client, !!enable,
287                                 BMA150_HIGH_G_EN_POS, BMA150_HIGH_G_EN_MSK,
288                                 BMA150_HIGH_G_EN_REG);
289 }
290
291
292 static int bma150_set_any_motion_interrupt(struct bma150_data *bma150,
293                                                 u8 enable, u8 dur, u8 thres)
294 {
295         int error;
296
297         error = bma150_set_reg_bits(bma150->client, dur,
298                                 BMA150_ANY_MOTION_DUR_POS,
299                                 BMA150_ANY_MOTION_DUR_MSK,
300                                 BMA150_ANY_MOTION_DUR_REG);
301         if (error)
302                 return error;
303
304         error = bma150_write_byte(bma150->client,
305                                 BMA150_ANY_MOTION_THRES_REG, thres);
306         if (error)
307                 return error;
308
309         error = bma150_set_reg_bits(bma150->client, !!enable,
310                                 BMA150_ADV_INT_EN_POS, BMA150_ADV_INT_EN_MSK,
311                                 BMA150_ADV_INT_EN_REG);
312         if (error)
313                 return error;
314
315         return bma150_set_reg_bits(bma150->client, !!enable,
316                                 BMA150_ANY_MOTION_EN_POS,
317                                 BMA150_ANY_MOTION_EN_MSK,
318                                 BMA150_ANY_MOTION_EN_REG);
319 }
320
321 static void bma150_report_xyz(struct bma150_data *bma150)
322 {
323         u8 data[BMA150_XYZ_DATA_SIZE];
324         s16 x, y, z;
325         s32 ret;
326
327         ret = i2c_smbus_read_i2c_block_data(bma150->client,
328                         BMA150_ACC_X_LSB_REG, BMA150_XYZ_DATA_SIZE, data);
329         if (ret != BMA150_XYZ_DATA_SIZE)
330                 return;
331
332         x = ((0xc0 & data[0]) >> 6) | (data[1] << 2);
333         y = ((0xc0 & data[2]) >> 6) | (data[3] << 2);
334         z = ((0xc0 & data[4]) >> 6) | (data[5] << 2);
335
336         /* sign extension */
337         x = (s16) (x << 6) >> 6;
338         y = (s16) (y << 6) >> 6;
339         z = (s16) (z << 6) >> 6;
340
341         input_report_abs(bma150->input, ABS_X, x);
342         input_report_abs(bma150->input, ABS_Y, y);
343         input_report_abs(bma150->input, ABS_Z, z);
344         input_sync(bma150->input);
345 }
346
347 static irqreturn_t bma150_irq_thread(int irq, void *dev)
348 {
349         bma150_report_xyz(dev);
350
351         return IRQ_HANDLED;
352 }
353
354 static void bma150_poll(struct input_polled_dev *dev)
355 {
356         bma150_report_xyz(dev->private);
357 }
358
359 static int bma150_open(struct bma150_data *bma150)
360 {
361         int error;
362
363         error = pm_runtime_get_sync(&bma150->client->dev);
364         if (error < 0 && error != -ENOSYS)
365                 return error;
366
367         /*
368          * See if runtime PM woke up the device. If runtime PM
369          * is disabled we need to do it ourselves.
370          */
371         if (bma150->mode != BMA150_MODE_NORMAL) {
372                 error = bma150_set_mode(bma150, BMA150_MODE_NORMAL);
373                 if (error)
374                         return error;
375         }
376
377         return 0;
378 }
379
380 static void bma150_close(struct bma150_data *bma150)
381 {
382         pm_runtime_put_sync(&bma150->client->dev);
383
384         if (bma150->mode != BMA150_MODE_SLEEP)
385                 bma150_set_mode(bma150, BMA150_MODE_SLEEP);
386 }
387
388 static int bma150_irq_open(struct input_dev *input)
389 {
390         struct bma150_data *bma150 = input_get_drvdata(input);
391
392         return bma150_open(bma150);
393 }
394
395 static void bma150_irq_close(struct input_dev *input)
396 {
397         struct bma150_data *bma150 = input_get_drvdata(input);
398
399         bma150_close(bma150);
400 }
401
402 static void bma150_poll_open(struct input_polled_dev *ipoll_dev)
403 {
404         struct bma150_data *bma150 = ipoll_dev->private;
405
406         bma150_open(bma150);
407 }
408
409 static void bma150_poll_close(struct input_polled_dev *ipoll_dev)
410 {
411         struct bma150_data *bma150 = ipoll_dev->private;
412
413         bma150_close(bma150);
414 }
415
416 static int bma150_initialize(struct bma150_data *bma150,
417                                        const struct bma150_cfg *cfg)
418 {
419         int error;
420
421         error = bma150_soft_reset(bma150);
422         if (error)
423                 return error;
424
425         error = bma150_set_bandwidth(bma150, cfg->bandwidth);
426         if (error)
427                 return error;
428
429         error = bma150_set_range(bma150, cfg->range);
430         if (error)
431                 return error;
432
433         if (bma150->client->irq) {
434                 error = bma150_set_any_motion_interrupt(bma150,
435                                         cfg->any_motion_int,
436                                         cfg->any_motion_dur,
437                                         cfg->any_motion_thres);
438                 if (error)
439                         return error;
440
441                 error = bma150_set_high_g_interrupt(bma150,
442                                         cfg->hg_int, cfg->hg_hyst,
443                                         cfg->hg_dur, cfg->hg_thres);
444                 if (error)
445                         return error;
446
447                 error = bma150_set_low_g_interrupt(bma150,
448                                         cfg->lg_int, cfg->lg_hyst,
449                                         cfg->lg_dur, cfg->lg_thres);
450                 if (error)
451                         return error;
452         }
453
454         return bma150_set_mode(bma150, BMA150_MODE_SLEEP);
455 }
456
457 static void bma150_init_input_device(struct bma150_data *bma150,
458                                                 struct input_dev *idev)
459 {
460         idev->name = BMA150_DRIVER;
461         idev->phys = BMA150_DRIVER "/input0";
462         idev->id.bustype = BUS_I2C;
463         idev->dev.parent = &bma150->client->dev;
464
465         idev->evbit[0] = BIT_MASK(EV_ABS);
466         input_set_abs_params(idev, ABS_X, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
467         input_set_abs_params(idev, ABS_Y, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
468         input_set_abs_params(idev, ABS_Z, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
469 }
470
471 static int bma150_register_input_device(struct bma150_data *bma150)
472 {
473         struct input_dev *idev;
474         int error;
475
476         idev = input_allocate_device();
477         if (!idev)
478                 return -ENOMEM;
479
480         bma150_init_input_device(bma150, idev);
481
482         idev->open = bma150_irq_open;
483         idev->close = bma150_irq_close;
484         input_set_drvdata(idev, bma150);
485
486         error = input_register_device(idev);
487         if (error) {
488                 input_free_device(idev);
489                 return error;
490         }
491
492         bma150->input = idev;
493         return 0;
494 }
495
496 static int bma150_register_polled_device(struct bma150_data *bma150)
497 {
498         struct input_polled_dev *ipoll_dev;
499         int error;
500
501         ipoll_dev = input_allocate_polled_device();
502         if (!ipoll_dev)
503                 return -ENOMEM;
504
505         ipoll_dev->private = bma150;
506         ipoll_dev->open = bma150_poll_open;
507         ipoll_dev->close = bma150_poll_close;
508         ipoll_dev->poll = bma150_poll;
509         ipoll_dev->poll_interval = BMA150_POLL_INTERVAL;
510         ipoll_dev->poll_interval_min = BMA150_POLL_MIN;
511         ipoll_dev->poll_interval_max = BMA150_POLL_MAX;
512
513         bma150_init_input_device(bma150, ipoll_dev->input);
514
515         error = input_register_polled_device(ipoll_dev);
516         if (error) {
517                 input_free_polled_device(ipoll_dev);
518                 return error;
519         }
520
521         bma150->input_polled = ipoll_dev;
522         bma150->input = ipoll_dev->input;
523
524         return 0;
525 }
526
527 static int bma150_probe(struct i2c_client *client,
528                                   const struct i2c_device_id *id)
529 {
530         const struct bma150_platform_data *pdata =
531                         dev_get_platdata(&client->dev);
532         const struct bma150_cfg *cfg;
533         struct bma150_data *bma150;
534         int chip_id;
535         int error;
536
537         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
538                 dev_err(&client->dev, "i2c_check_functionality error\n");
539                 return -EIO;
540         }
541
542         chip_id = i2c_smbus_read_byte_data(client, BMA150_CHIP_ID_REG);
543         if (chip_id != BMA150_CHIP_ID && chip_id != BMA180_CHIP_ID) {
544                 dev_err(&client->dev, "BMA150 chip id error: %d\n", chip_id);
545                 return -EINVAL;
546         }
547
548         bma150 = kzalloc(sizeof(struct bma150_data), GFP_KERNEL);
549         if (!bma150)
550                 return -ENOMEM;
551
552         bma150->client = client;
553
554         if (pdata) {
555                 if (pdata->irq_gpio_cfg) {
556                         error = pdata->irq_gpio_cfg();
557                         if (error) {
558                                 dev_err(&client->dev,
559                                         "IRQ GPIO conf. error %d, error %d\n",
560                                         client->irq, error);
561                                 goto err_free_mem;
562                         }
563                 }
564                 cfg = &pdata->cfg;
565         } else {
566                 cfg = &default_cfg;
567         }
568
569         error = bma150_initialize(bma150, cfg);
570         if (error)
571                 goto err_free_mem;
572
573         if (client->irq > 0) {
574                 error = bma150_register_input_device(bma150);
575                 if (error)
576                         goto err_free_mem;
577
578                 error = request_threaded_irq(client->irq,
579                                         NULL, bma150_irq_thread,
580                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
581                                         BMA150_DRIVER, bma150);
582                 if (error) {
583                         dev_err(&client->dev,
584                                 "irq request failed %d, error %d\n",
585                                 client->irq, error);
586                         input_unregister_device(bma150->input);
587                         goto err_free_mem;
588                 }
589         } else {
590                 error = bma150_register_polled_device(bma150);
591                 if (error)
592                         goto err_free_mem;
593         }
594
595         i2c_set_clientdata(client, bma150);
596
597         pm_runtime_enable(&client->dev);
598
599         return 0;
600
601 err_free_mem:
602         kfree(bma150);
603         return error;
604 }
605
606 static int bma150_remove(struct i2c_client *client)
607 {
608         struct bma150_data *bma150 = i2c_get_clientdata(client);
609
610         pm_runtime_disable(&client->dev);
611
612         if (client->irq > 0) {
613                 free_irq(client->irq, bma150);
614                 input_unregister_device(bma150->input);
615         } else {
616                 input_unregister_polled_device(bma150->input_polled);
617                 input_free_polled_device(bma150->input_polled);
618         }
619
620         kfree(bma150);
621
622         return 0;
623 }
624
625 #ifdef CONFIG_PM
626 static int bma150_suspend(struct device *dev)
627 {
628         struct i2c_client *client = to_i2c_client(dev);
629         struct bma150_data *bma150 = i2c_get_clientdata(client);
630
631         return bma150_set_mode(bma150, BMA150_MODE_SLEEP);
632 }
633
634 static int bma150_resume(struct device *dev)
635 {
636         struct i2c_client *client = to_i2c_client(dev);
637         struct bma150_data *bma150 = i2c_get_clientdata(client);
638
639         return bma150_set_mode(bma150, BMA150_MODE_NORMAL);
640 }
641 #endif
642
643 static UNIVERSAL_DEV_PM_OPS(bma150_pm, bma150_suspend, bma150_resume, NULL);
644
645 static const struct i2c_device_id bma150_id[] = {
646         { "bma150", 0 },
647         { "bma180", 0 },
648         { "smb380", 0 },
649         { "bma023", 0 },
650         { }
651 };
652
653 MODULE_DEVICE_TABLE(i2c, bma150_id);
654
655 static struct i2c_driver bma150_driver = {
656         .driver = {
657                 .owner  = THIS_MODULE,
658                 .name   = BMA150_DRIVER,
659                 .pm     = &bma150_pm,
660         },
661         .class          = I2C_CLASS_HWMON,
662         .id_table       = bma150_id,
663         .probe          = bma150_probe,
664         .remove         = bma150_remove,
665 };
666
667 module_i2c_driver(bma150_driver);
668
669 MODULE_AUTHOR("Albert Zhang <xu.zhang@bosch-sensortec.com>");
670 MODULE_DESCRIPTION("BMA150 driver");
671 MODULE_LICENSE("GPL");