2
* ADIS16220 Programmable Digital Vibration Sensor driver
4
* Copyright 2010 Analog Devices Inc.
6
* Licensed under the GPL-2 or later.
9
#include <linux/delay.h>
10
#include <linux/mutex.h>
11
#include <linux/device.h>
12
#include <linux/kernel.h>
13
#include <linux/spi/spi.h>
14
#include <linux/slab.h>
15
#include <linux/sysfs.h>
16
#include <linux/module.h>
21
#include "adis16220.h"
23
#define DRIVER_NAME "adis16220"
26
* adis16220_spi_write_reg_8() - write single byte to a register
27
* @indio_dev: iio device associated with child of actual device
28
* @reg_address: the address of the register to be written
29
* @val: the value to write
31
static int adis16220_spi_write_reg_8(struct iio_dev *indio_dev,
36
struct adis16220_state *st = iio_priv(indio_dev);
38
mutex_lock(&st->buf_lock);
39
st->tx[0] = ADIS16220_WRITE_REG(reg_address);
42
ret = spi_write(st->us, st->tx, 2);
43
mutex_unlock(&st->buf_lock);
49
* adis16220_spi_write_reg_16() - write 2 bytes to a pair of registers
50
* @indio_dev: iio device associated with child of actual device
51
* @reg_address: the address of the lower of the two registers. Second register
52
* is assumed to have address one greater.
53
* @val: value to be written
55
static int adis16220_spi_write_reg_16(struct iio_dev *indio_dev,
60
struct spi_message msg;
61
struct adis16220_state *st = iio_priv(indio_dev);
62
struct spi_transfer xfers[] = {
77
mutex_lock(&st->buf_lock);
78
st->tx[0] = ADIS16220_WRITE_REG(lower_reg_address);
79
st->tx[1] = value & 0xFF;
80
st->tx[2] = ADIS16220_WRITE_REG(lower_reg_address + 1);
81
st->tx[3] = (value >> 8) & 0xFF;
83
spi_message_init(&msg);
84
spi_message_add_tail(&xfers[0], &msg);
85
spi_message_add_tail(&xfers[1], &msg);
86
ret = spi_sync(st->us, &msg);
87
mutex_unlock(&st->buf_lock);
93
* adis16220_spi_read_reg_16() - read 2 bytes from a 16-bit register
94
* @indio_dev: iio device associated with child of actual device
95
* @reg_address: the address of the lower of the two registers. Second register
96
* is assumed to have address one greater.
97
* @val: somewhere to pass back the value read
99
static int adis16220_spi_read_reg_16(struct iio_dev *indio_dev,
100
u8 lower_reg_address,
103
struct spi_message msg;
104
struct adis16220_state *st = iio_priv(indio_dev);
106
struct spi_transfer xfers[] = {
122
mutex_lock(&st->buf_lock);
123
st->tx[0] = ADIS16220_READ_REG(lower_reg_address);
126
spi_message_init(&msg);
127
spi_message_add_tail(&xfers[0], &msg);
128
spi_message_add_tail(&xfers[1], &msg);
129
ret = spi_sync(st->us, &msg);
131
dev_err(&st->us->dev,
132
"problem when reading 16 bit register 0x%02X",
136
*val = (st->rx[0] << 8) | st->rx[1];
139
mutex_unlock(&st->buf_lock);
143
static ssize_t adis16220_read_16bit(struct device *dev,
144
struct device_attribute *attr,
147
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
148
struct iio_dev *indio_dev = dev_get_drvdata(dev);
152
/* Take the iio_dev status lock */
153
mutex_lock(&indio_dev->mlock);
154
ret = adis16220_spi_read_reg_16(indio_dev, this_attr->address,
156
mutex_unlock(&indio_dev->mlock);
159
return sprintf(buf, "%d\n", val);
162
static ssize_t adis16220_write_16bit(struct device *dev,
163
struct device_attribute *attr,
167
struct iio_dev *indio_dev = dev_get_drvdata(dev);
168
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
172
ret = strict_strtol(buf, 10, &val);
175
ret = adis16220_spi_write_reg_16(indio_dev, this_attr->address, val);
178
return ret ? ret : len;
181
static int adis16220_capture(struct iio_dev *indio_dev)
184
ret = adis16220_spi_write_reg_16(indio_dev,
186
0xBF08); /* initiates a manual data capture */
188
dev_err(&indio_dev->dev, "problem beginning capture");
190
msleep(10); /* delay for capture to finish */
195
static int adis16220_reset(struct iio_dev *indio_dev)
198
ret = adis16220_spi_write_reg_8(indio_dev,
200
ADIS16220_GLOB_CMD_SW_RESET);
202
dev_err(&indio_dev->dev, "problem resetting device");
207
static ssize_t adis16220_write_reset(struct device *dev,
208
struct device_attribute *attr,
209
const char *buf, size_t len)
211
struct iio_dev *indio_dev = dev_get_drvdata(dev);
215
ret = strtobool(buf, &val);
221
ret = adis16220_reset(indio_dev);
227
static ssize_t adis16220_write_capture(struct device *dev,
228
struct device_attribute *attr,
229
const char *buf, size_t len)
231
struct iio_dev *indio_dev = dev_get_drvdata(dev);
235
ret = strtobool(buf, &val);
240
ret = adis16220_capture(indio_dev);
247
static int adis16220_check_status(struct iio_dev *indio_dev)
252
ret = adis16220_spi_read_reg_16(indio_dev, ADIS16220_DIAG_STAT,
256
dev_err(&indio_dev->dev, "Reading status failed\n");
261
if (status & ADIS16220_DIAG_STAT_VIOLATION)
262
dev_err(&indio_dev->dev,
263
"Capture period violation/interruption\n");
264
if (status & ADIS16220_DIAG_STAT_SPI_FAIL)
265
dev_err(&indio_dev->dev, "SPI failure\n");
266
if (status & ADIS16220_DIAG_STAT_FLASH_UPT)
267
dev_err(&indio_dev->dev, "Flash update failed\n");
268
if (status & ADIS16220_DIAG_STAT_POWER_HIGH)
269
dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
270
if (status & ADIS16220_DIAG_STAT_POWER_LOW)
271
dev_err(&indio_dev->dev, "Power supply below 3.15V\n");
277
static int adis16220_self_test(struct iio_dev *indio_dev)
280
ret = adis16220_spi_write_reg_16(indio_dev,
282
ADIS16220_MSC_CTRL_SELF_TEST_EN);
284
dev_err(&indio_dev->dev, "problem starting self test");
288
adis16220_check_status(indio_dev);
294
static int adis16220_initial_setup(struct iio_dev *indio_dev)
299
ret = adis16220_self_test(indio_dev);
301
dev_err(&indio_dev->dev, "self test failure");
305
/* Read status register to check the result */
306
ret = adis16220_check_status(indio_dev);
308
adis16220_reset(indio_dev);
309
dev_err(&indio_dev->dev, "device not playing ball -> reset");
310
msleep(ADIS16220_STARTUP_DELAY);
311
ret = adis16220_check_status(indio_dev);
313
dev_err(&indio_dev->dev, "giving up");
322
static ssize_t adis16220_capture_buffer_read(struct iio_dev *indio_dev,
328
struct adis16220_state *st = iio_priv(indio_dev);
329
struct spi_message msg;
330
struct spi_transfer xfers[] = {
348
if (unlikely(!count))
351
if ((off >= ADIS16220_CAPTURE_SIZE) || (count & 1) || (off & 1))
354
if (off + count > ADIS16220_CAPTURE_SIZE)
355
count = ADIS16220_CAPTURE_SIZE - off;
357
/* write the begin position of capture buffer */
358
ret = adis16220_spi_write_reg_16(indio_dev,
364
/* read count/2 values from capture buffer */
365
mutex_lock(&st->buf_lock);
367
for (i = 0; i < count; i += 2) {
368
st->tx[i] = ADIS16220_READ_REG(addr);
371
xfers[1].len = count;
373
spi_message_init(&msg);
374
spi_message_add_tail(&xfers[0], &msg);
375
spi_message_add_tail(&xfers[1], &msg);
376
ret = spi_sync(st->us, &msg);
379
mutex_unlock(&st->buf_lock);
383
memcpy(buf, st->rx, count);
385
mutex_unlock(&st->buf_lock);
389
static ssize_t adis16220_accel_bin_read(struct file *filp, struct kobject *kobj,
390
struct bin_attribute *attr,
395
struct device *dev = container_of(kobj, struct device, kobj);
396
struct iio_dev *indio_dev = dev_get_drvdata(dev);
398
return adis16220_capture_buffer_read(indio_dev, buf,
400
ADIS16220_CAPT_BUFA);
403
static struct bin_attribute accel_bin = {
408
.read = adis16220_accel_bin_read,
409
.size = ADIS16220_CAPTURE_SIZE,
412
static ssize_t adis16220_adc1_bin_read(struct file *filp, struct kobject *kobj,
413
struct bin_attribute *attr,
414
char *buf, loff_t off,
417
struct device *dev = container_of(kobj, struct device, kobj);
418
struct iio_dev *indio_dev = dev_get_drvdata(dev);
420
return adis16220_capture_buffer_read(indio_dev, buf,
422
ADIS16220_CAPT_BUF1);
425
static struct bin_attribute adc1_bin = {
430
.read = adis16220_adc1_bin_read,
431
.size = ADIS16220_CAPTURE_SIZE,
434
static ssize_t adis16220_adc2_bin_read(struct file *filp, struct kobject *kobj,
435
struct bin_attribute *attr,
436
char *buf, loff_t off,
439
struct device *dev = container_of(kobj, struct device, kobj);
440
struct iio_dev *indio_dev = dev_get_drvdata(dev);
442
return adis16220_capture_buffer_read(indio_dev, buf,
444
ADIS16220_CAPT_BUF2);
448
static struct bin_attribute adc2_bin = {
453
.read = adis16220_adc2_bin_read,
454
.size = ADIS16220_CAPTURE_SIZE,
457
static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL,
458
adis16220_write_reset, 0);
460
#define IIO_DEV_ATTR_CAPTURE(_store) \
461
IIO_DEVICE_ATTR(capture, S_IWUSR, NULL, _store, 0)
463
static IIO_DEV_ATTR_CAPTURE(adis16220_write_capture);
465
#define IIO_DEV_ATTR_CAPTURE_COUNT(_mode, _show, _store, _addr) \
466
IIO_DEVICE_ATTR(capture_count, _mode, _show, _store, _addr)
468
static IIO_DEV_ATTR_CAPTURE_COUNT(S_IWUSR | S_IRUGO,
469
adis16220_read_16bit,
470
adis16220_write_16bit,
471
ADIS16220_CAPT_PNTR);
473
enum adis16220_channel {
474
in_supply, in_1, in_2, accel, temp
477
struct adis16220_address_spec {
483
/* Address / bits / signed */
484
static const struct adis16220_address_spec adis16220_addresses[][3] = {
485
[in_supply] = { { ADIS16220_CAPT_SUPPLY, 12, 0 }, },
486
[in_1] = { { ADIS16220_CAPT_BUF1, 16, 1 },
487
{ ADIS16220_AIN1_NULL, 16, 1 },
488
{ ADIS16220_CAPT_PEAK1, 16, 1 }, },
489
[in_2] = { { ADIS16220_CAPT_BUF2, 16, 1 },
490
{ ADIS16220_AIN2_NULL, 16, 1 },
491
{ ADIS16220_CAPT_PEAK2, 16, 1 }, },
492
[accel] = { { ADIS16220_CAPT_BUFA, 16, 1 },
493
{ ADIS16220_ACCL_NULL, 16, 1 },
494
{ ADIS16220_CAPT_PEAKA, 16, 1 }, },
495
[temp] = { { ADIS16220_CAPT_TEMP, 12, 0 }, }
498
static int adis16220_read_raw(struct iio_dev *indio_dev,
499
struct iio_chan_spec const *chan,
513
case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
514
if (chan->type == IIO_TEMP) {
520
case (1 << IIO_CHAN_INFO_PEAK_SEPARATE):
523
case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
525
switch (chan->type) {
528
return IIO_VAL_INT_PLUS_MICRO;
531
return IIO_VAL_INT_PLUS_MICRO;
533
if (chan->channel == 0)
535
else /* Should really be dependent on VDD */
537
return IIO_VAL_INT_PLUS_MICRO;
544
if (adis16220_addresses[chan->address][addrind].sign) {
545
ret = adis16220_spi_read_reg_16(indio_dev,
546
adis16220_addresses[chan
552
bits = adis16220_addresses[chan->address][addrind].bits;
553
sval &= (1 << bits) - 1;
554
sval = (s16)(sval << (16 - bits)) >> (16 - bits);
558
ret = adis16220_spi_read_reg_16(indio_dev,
559
adis16220_addresses[chan
565
bits = adis16220_addresses[chan->address][addrind].bits;
566
uval &= (1 << bits) - 1;
572
static const struct iio_chan_spec adis16220_channels[] = {
577
.extend_name = "supply",
578
.info_mask = (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
579
.address = in_supply,
582
.info_mask = (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) |
583
(1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
584
(1 << IIO_CHAN_INFO_PEAK_SEPARATE),
590
.info_mask = (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) |
591
(1 << IIO_CHAN_INFO_SCALE_SEPARATE),
597
.info_mask = (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) |
598
(1 << IIO_CHAN_INFO_SCALE_SEPARATE),
608
static struct attribute *adis16220_attributes[] = {
609
&iio_dev_attr_reset.dev_attr.attr,
610
&iio_dev_attr_capture.dev_attr.attr,
611
&iio_dev_attr_capture_count.dev_attr.attr,
615
static const struct attribute_group adis16220_attribute_group = {
616
.attrs = adis16220_attributes,
619
static const struct iio_info adis16220_info = {
620
.attrs = &adis16220_attribute_group,
621
.driver_module = THIS_MODULE,
622
.read_raw = &adis16220_read_raw,
625
static int __devinit adis16220_probe(struct spi_device *spi)
628
struct adis16220_state *st;
629
struct iio_dev *indio_dev;
631
/* setup the industrialio driver allocated elements */
632
indio_dev = iio_allocate_device(sizeof(*st));
633
if (indio_dev == NULL) {
638
st = iio_priv(indio_dev);
639
/* this is only used for removal purposes */
640
spi_set_drvdata(spi, indio_dev);
643
mutex_init(&st->buf_lock);
645
indio_dev->name = spi->dev.driver->name;
646
indio_dev->dev.parent = &spi->dev;
647
indio_dev->info = &adis16220_info;
648
indio_dev->modes = INDIO_DIRECT_MODE;
649
indio_dev->channels = adis16220_channels;
650
indio_dev->num_channels = ARRAY_SIZE(adis16220_channels);
652
ret = iio_device_register(indio_dev);
656
ret = sysfs_create_bin_file(&indio_dev->dev.kobj, &accel_bin);
658
goto error_unregister_dev;
660
ret = sysfs_create_bin_file(&indio_dev->dev.kobj, &adc1_bin);
662
goto error_rm_accel_bin;
664
ret = sysfs_create_bin_file(&indio_dev->dev.kobj, &adc2_bin);
666
goto error_rm_adc1_bin;
668
/* Get the device into a sane initial state */
669
ret = adis16220_initial_setup(indio_dev);
671
goto error_rm_adc2_bin;
675
sysfs_remove_bin_file(&indio_dev->dev.kobj, &adc2_bin);
677
sysfs_remove_bin_file(&indio_dev->dev.kobj, &adc1_bin);
679
sysfs_remove_bin_file(&indio_dev->dev.kobj, &accel_bin);
680
error_unregister_dev:
681
iio_device_unregister(indio_dev);
683
iio_free_device(indio_dev);
688
static int adis16220_remove(struct spi_device *spi)
690
struct iio_dev *indio_dev = spi_get_drvdata(spi);
692
flush_scheduled_work();
694
sysfs_remove_bin_file(&indio_dev->dev.kobj, &adc2_bin);
695
sysfs_remove_bin_file(&indio_dev->dev.kobj, &adc1_bin);
696
sysfs_remove_bin_file(&indio_dev->dev.kobj, &accel_bin);
697
iio_device_unregister(indio_dev);
698
iio_free_device(indio_dev);
703
static struct spi_driver adis16220_driver = {
706
.owner = THIS_MODULE,
708
.probe = adis16220_probe,
709
.remove = __devexit_p(adis16220_remove),
712
static __init int adis16220_init(void)
714
return spi_register_driver(&adis16220_driver);
716
module_init(adis16220_init);
718
static __exit void adis16220_exit(void)
720
spi_unregister_driver(&adis16220_driver);
722
module_exit(adis16220_exit);
724
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
725
MODULE_DESCRIPTION("Analog Devices ADIS16220 Digital Vibration Sensor");
726
MODULE_LICENSE("GPL v2");