2 * Copyright (c) 2011 Bosch Sensortec GmbH
3 * Copyright (c) 2011 Unixphere
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.
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
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.
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.
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.
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>
35 #include <linux/pm_runtime.h>
36 #include <linux/bma150.h>
38 #define ABSMAX_ACC_VAL 0x01FF
39 #define ABSMIN_ACC_VAL -(ABSMAX_ACC_VAL)
41 /* Each axis is represented by a 2-byte data word */
42 #define BMA150_XYZ_DATA_SIZE 6
44 /* Input poll interval in milliseconds */
45 #define BMA150_POLL_INTERVAL 10
46 #define BMA150_POLL_MAX 200
47 #define BMA150_POLL_MIN 0
49 #define BMA150_MODE_NORMAL 0
50 #define BMA150_MODE_SLEEP 2
51 #define BMA150_MODE_WAKE_UP 3
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
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
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
72 #define BMA150_CHIP_ID 2
73 #define BMA180_CHIP_ID 3
74 #define BMA150_CHIP_ID_REG BMA150_DATA_0_REG
76 #define BMA150_ACC_X_LSB_REG BMA150_DATA_2_REG
78 #define BMA150_SLEEP_POS 0
79 #define BMA150_SLEEP_MSK 0x01
80 #define BMA150_SLEEP_REG BMA150_CTRL_0_REG
82 #define BMA150_BANDWIDTH_POS 0
83 #define BMA150_BANDWIDTH_MSK 0x07
84 #define BMA150_BANDWIDTH_REG BMA150_CTRL_2_REG
86 #define BMA150_RANGE_POS 3
87 #define BMA150_RANGE_MSK 0x18
88 #define BMA150_RANGE_REG BMA150_CTRL_2_REG
90 #define BMA150_WAKE_UP_POS 0
91 #define BMA150_WAKE_UP_MSK 0x01
92 #define BMA150_WAKE_UP_REG BMA150_CTRL_3_REG
94 #define BMA150_SW_RES_POS 1
95 #define BMA150_SW_RES_MSK 0x02
96 #define BMA150_SW_RES_REG BMA150_CTRL_0_REG
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
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
107 #define BMA150_ANY_MOTION_THRES_REG BMA150_CFG_4_REG
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
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
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
123 #define BMA150_HIGH_G_DUR_REG BMA150_CFG_3_REG
124 #define BMA150_HIGH_G_THRES_REG BMA150_CFG_2_REG
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
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
135 #define BMA150_LOW_G_DUR_REG BMA150_CFG_1_REG
136 #define BMA150_LOW_G_THRES_REG BMA150_CFG_0_REG
139 struct i2c_client
*client
;
140 struct input_polled_dev
*input_polled
;
141 struct input_dev
*input
;
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.
150 static struct bma150_cfg default_cfg
= {
155 .any_motion_thres
= 0,
162 .range
= BMA150_RANGE_2G
,
163 .bandwidth
= BMA150_BW_50HZ
166 static int bma150_write_byte(struct i2c_client
*client
, u8 reg
, u8 val
)
170 /* As per specification, disable irq in between register writes */
172 disable_irq_nosync(client
->irq
);
174 ret
= i2c_smbus_write_byte_data(client
, reg
, val
);
177 enable_irq(client
->irq
);
182 static int bma150_set_reg_bits(struct i2c_client
*client
,
183 int val
, int shift
, u8 mask
, u8 reg
)
187 data
= i2c_smbus_read_byte_data(client
, reg
);
191 data
= (data
& ~mask
) | ((val
<< shift
) & mask
);
192 return bma150_write_byte(client
, reg
, data
);
195 static int bma150_set_mode(struct bma150_data
*bma150
, u8 mode
)
199 error
= bma150_set_reg_bits(bma150
->client
, mode
, BMA150_WAKE_UP_POS
,
200 BMA150_WAKE_UP_MSK
, BMA150_WAKE_UP_REG
);
204 error
= bma150_set_reg_bits(bma150
->client
, mode
, BMA150_SLEEP_POS
,
205 BMA150_SLEEP_MSK
, BMA150_SLEEP_REG
);
209 if (mode
== BMA150_MODE_NORMAL
)
216 static int bma150_soft_reset(struct bma150_data
*bma150
)
220 error
= bma150_set_reg_bits(bma150
->client
, 1, BMA150_SW_RES_POS
,
221 BMA150_SW_RES_MSK
, BMA150_SW_RES_REG
);
229 static int bma150_set_range(struct bma150_data
*bma150
, u8 range
)
231 return bma150_set_reg_bits(bma150
->client
, range
, BMA150_RANGE_POS
,
232 BMA150_RANGE_MSK
, BMA150_RANGE_REG
);
235 static int bma150_set_bandwidth(struct bma150_data
*bma150
, u8 bw
)
237 return bma150_set_reg_bits(bma150
->client
, bw
, BMA150_BANDWIDTH_POS
,
238 BMA150_BANDWIDTH_MSK
, BMA150_BANDWIDTH_REG
);
241 static int bma150_set_low_g_interrupt(struct bma150_data
*bma150
,
242 u8 enable
, u8 hyst
, u8 dur
, u8 thres
)
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
);
252 error
= bma150_write_byte(bma150
->client
, BMA150_LOW_G_DUR_REG
, dur
);
256 error
= bma150_write_byte(bma150
->client
, BMA150_LOW_G_THRES_REG
, thres
);
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
);
265 static int bma150_set_high_g_interrupt(struct bma150_data
*bma150
,
266 u8 enable
, u8 hyst
, u8 dur
, u8 thres
)
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
);
276 error
= bma150_write_byte(bma150
->client
,
277 BMA150_HIGH_G_DUR_REG
, dur
);
281 error
= bma150_write_byte(bma150
->client
,
282 BMA150_HIGH_G_THRES_REG
, thres
);
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
);
292 static int bma150_set_any_motion_interrupt(struct bma150_data
*bma150
,
293 u8 enable
, u8 dur
, u8 thres
)
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
);
304 error
= bma150_write_byte(bma150
->client
,
305 BMA150_ANY_MOTION_THRES_REG
, thres
);
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
);
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
);
321 static void bma150_report_xyz(struct bma150_data
*bma150
)
323 u8 data
[BMA150_XYZ_DATA_SIZE
];
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
)
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);
336 x
= sign_extend32(x
, 9);
337 y
= sign_extend32(y
, 9);
338 z
= sign_extend32(z
, 9);
340 input_report_abs(bma150
->input
, ABS_X
, x
);
341 input_report_abs(bma150
->input
, ABS_Y
, y
);
342 input_report_abs(bma150
->input
, ABS_Z
, z
);
343 input_sync(bma150
->input
);
346 static irqreturn_t
bma150_irq_thread(int irq
, void *dev
)
348 bma150_report_xyz(dev
);
353 static void bma150_poll(struct input_polled_dev
*dev
)
355 bma150_report_xyz(dev
->private);
358 static int bma150_open(struct bma150_data
*bma150
)
362 error
= pm_runtime_get_sync(&bma150
->client
->dev
);
363 if (error
< 0 && error
!= -ENOSYS
)
367 * See if runtime PM woke up the device. If runtime PM
368 * is disabled we need to do it ourselves.
370 if (bma150
->mode
!= BMA150_MODE_NORMAL
) {
371 error
= bma150_set_mode(bma150
, BMA150_MODE_NORMAL
);
379 static void bma150_close(struct bma150_data
*bma150
)
381 pm_runtime_put_sync(&bma150
->client
->dev
);
383 if (bma150
->mode
!= BMA150_MODE_SLEEP
)
384 bma150_set_mode(bma150
, BMA150_MODE_SLEEP
);
387 static int bma150_irq_open(struct input_dev
*input
)
389 struct bma150_data
*bma150
= input_get_drvdata(input
);
391 return bma150_open(bma150
);
394 static void bma150_irq_close(struct input_dev
*input
)
396 struct bma150_data
*bma150
= input_get_drvdata(input
);
398 bma150_close(bma150
);
401 static void bma150_poll_open(struct input_polled_dev
*ipoll_dev
)
403 struct bma150_data
*bma150
= ipoll_dev
->private;
408 static void bma150_poll_close(struct input_polled_dev
*ipoll_dev
)
410 struct bma150_data
*bma150
= ipoll_dev
->private;
412 bma150_close(bma150
);
415 static int bma150_initialize(struct bma150_data
*bma150
,
416 const struct bma150_cfg
*cfg
)
420 error
= bma150_soft_reset(bma150
);
424 error
= bma150_set_bandwidth(bma150
, cfg
->bandwidth
);
428 error
= bma150_set_range(bma150
, cfg
->range
);
432 if (bma150
->client
->irq
) {
433 error
= bma150_set_any_motion_interrupt(bma150
,
436 cfg
->any_motion_thres
);
440 error
= bma150_set_high_g_interrupt(bma150
,
441 cfg
->hg_int
, cfg
->hg_hyst
,
442 cfg
->hg_dur
, cfg
->hg_thres
);
446 error
= bma150_set_low_g_interrupt(bma150
,
447 cfg
->lg_int
, cfg
->lg_hyst
,
448 cfg
->lg_dur
, cfg
->lg_thres
);
453 return bma150_set_mode(bma150
, BMA150_MODE_SLEEP
);
456 static void bma150_init_input_device(struct bma150_data
*bma150
,
457 struct input_dev
*idev
)
459 idev
->name
= BMA150_DRIVER
;
460 idev
->phys
= BMA150_DRIVER
"/input0";
461 idev
->id
.bustype
= BUS_I2C
;
462 idev
->dev
.parent
= &bma150
->client
->dev
;
464 idev
->evbit
[0] = BIT_MASK(EV_ABS
);
465 input_set_abs_params(idev
, ABS_X
, ABSMIN_ACC_VAL
, ABSMAX_ACC_VAL
, 0, 0);
466 input_set_abs_params(idev
, ABS_Y
, ABSMIN_ACC_VAL
, ABSMAX_ACC_VAL
, 0, 0);
467 input_set_abs_params(idev
, ABS_Z
, ABSMIN_ACC_VAL
, ABSMAX_ACC_VAL
, 0, 0);
470 static int bma150_register_input_device(struct bma150_data
*bma150
)
472 struct input_dev
*idev
;
475 idev
= input_allocate_device();
479 bma150_init_input_device(bma150
, idev
);
481 idev
->open
= bma150_irq_open
;
482 idev
->close
= bma150_irq_close
;
483 input_set_drvdata(idev
, bma150
);
485 error
= input_register_device(idev
);
487 input_free_device(idev
);
491 bma150
->input
= idev
;
495 static int bma150_register_polled_device(struct bma150_data
*bma150
)
497 struct input_polled_dev
*ipoll_dev
;
500 ipoll_dev
= input_allocate_polled_device();
504 ipoll_dev
->private = bma150
;
505 ipoll_dev
->open
= bma150_poll_open
;
506 ipoll_dev
->close
= bma150_poll_close
;
507 ipoll_dev
->poll
= bma150_poll
;
508 ipoll_dev
->poll_interval
= BMA150_POLL_INTERVAL
;
509 ipoll_dev
->poll_interval_min
= BMA150_POLL_MIN
;
510 ipoll_dev
->poll_interval_max
= BMA150_POLL_MAX
;
512 bma150_init_input_device(bma150
, ipoll_dev
->input
);
514 error
= input_register_polled_device(ipoll_dev
);
516 input_free_polled_device(ipoll_dev
);
520 bma150
->input_polled
= ipoll_dev
;
521 bma150
->input
= ipoll_dev
->input
;
526 static int bma150_probe(struct i2c_client
*client
,
527 const struct i2c_device_id
*id
)
529 const struct bma150_platform_data
*pdata
=
530 dev_get_platdata(&client
->dev
);
531 const struct bma150_cfg
*cfg
;
532 struct bma150_data
*bma150
;
536 if (!i2c_check_functionality(client
->adapter
, I2C_FUNC_I2C
)) {
537 dev_err(&client
->dev
, "i2c_check_functionality error\n");
541 chip_id
= i2c_smbus_read_byte_data(client
, BMA150_CHIP_ID_REG
);
542 if (chip_id
!= BMA150_CHIP_ID
&& chip_id
!= BMA180_CHIP_ID
) {
543 dev_err(&client
->dev
, "BMA150 chip id error: %d\n", chip_id
);
547 bma150
= kzalloc(sizeof(struct bma150_data
), GFP_KERNEL
);
551 bma150
->client
= client
;
554 if (pdata
->irq_gpio_cfg
) {
555 error
= pdata
->irq_gpio_cfg();
557 dev_err(&client
->dev
,
558 "IRQ GPIO conf. error %d, error %d\n",
568 error
= bma150_initialize(bma150
, cfg
);
572 if (client
->irq
> 0) {
573 error
= bma150_register_input_device(bma150
);
577 error
= request_threaded_irq(client
->irq
,
578 NULL
, bma150_irq_thread
,
579 IRQF_TRIGGER_RISING
| IRQF_ONESHOT
,
580 BMA150_DRIVER
, bma150
);
582 dev_err(&client
->dev
,
583 "irq request failed %d, error %d\n",
585 input_unregister_device(bma150
->input
);
589 error
= bma150_register_polled_device(bma150
);
594 i2c_set_clientdata(client
, bma150
);
596 pm_runtime_enable(&client
->dev
);
605 static int bma150_remove(struct i2c_client
*client
)
607 struct bma150_data
*bma150
= i2c_get_clientdata(client
);
609 pm_runtime_disable(&client
->dev
);
611 if (client
->irq
> 0) {
612 free_irq(client
->irq
, bma150
);
613 input_unregister_device(bma150
->input
);
615 input_unregister_polled_device(bma150
->input_polled
);
616 input_free_polled_device(bma150
->input_polled
);
625 static int bma150_suspend(struct device
*dev
)
627 struct i2c_client
*client
= to_i2c_client(dev
);
628 struct bma150_data
*bma150
= i2c_get_clientdata(client
);
630 return bma150_set_mode(bma150
, BMA150_MODE_SLEEP
);
633 static int bma150_resume(struct device
*dev
)
635 struct i2c_client
*client
= to_i2c_client(dev
);
636 struct bma150_data
*bma150
= i2c_get_clientdata(client
);
638 return bma150_set_mode(bma150
, BMA150_MODE_NORMAL
);
642 static UNIVERSAL_DEV_PM_OPS(bma150_pm
, bma150_suspend
, bma150_resume
, NULL
);
644 static const struct i2c_device_id bma150_id
[] = {
652 MODULE_DEVICE_TABLE(i2c
, bma150_id
);
654 static struct i2c_driver bma150_driver
= {
656 .name
= BMA150_DRIVER
,
659 .class = I2C_CLASS_HWMON
,
660 .id_table
= bma150_id
,
661 .probe
= bma150_probe
,
662 .remove
= bma150_remove
,
665 module_i2c_driver(bma150_driver
);
667 MODULE_AUTHOR("Albert Zhang <xu.zhang@bosch-sensortec.com>");
668 MODULE_DESCRIPTION("BMA150 driver");
669 MODULE_LICENSE("GPL");