2 * ADIS16209 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/list.h>
17 #include <linux/module.h>
21 #include "../ring_generic.h"
23 #include "adis16209.h"
25 #define DRIVER_NAME "adis16209"
28 * adis16209_spi_write_reg_8() - write single byte to a register
29 * @indio_dev: iio device associated with actual device
30 * @reg_address: the address of the register to be written
31 * @val: the value to write
33 static int adis16209_spi_write_reg_8(struct iio_dev *indio_dev,
38 struct adis16209_state *st = iio_priv(indio_dev);
40 mutex_lock(&st->buf_lock);
41 st->tx[0] = ADIS16209_WRITE_REG(reg_address);
44 ret = spi_write(st->us, st->tx, 2);
45 mutex_unlock(&st->buf_lock);
51 * adis16209_spi_write_reg_16() - write 2 bytes to a pair of registers
52 * @indio_dev: iio device associated actual device
53 * @reg_address: the address of the lower of the two registers. Second register
54 * is assumed to have address one greater.
55 * @val: value to be written
57 static int adis16209_spi_write_reg_16(struct iio_dev *indio_dev,
62 struct spi_message msg;
63 struct adis16209_state *st = iio_priv(indio_dev);
64 struct spi_transfer xfers[] = {
79 mutex_lock(&st->buf_lock);
80 st->tx[0] = ADIS16209_WRITE_REG(lower_reg_address);
81 st->tx[1] = value & 0xFF;
82 st->tx[2] = ADIS16209_WRITE_REG(lower_reg_address + 1);
83 st->tx[3] = (value >> 8) & 0xFF;
85 spi_message_init(&msg);
86 spi_message_add_tail(&xfers[0], &msg);
87 spi_message_add_tail(&xfers[1], &msg);
88 ret = spi_sync(st->us, &msg);
89 mutex_unlock(&st->buf_lock);
95 * adis16209_spi_read_reg_16() - read 2 bytes from a 16-bit register
96 * @indio_dev: iio device associated with device
97 * @reg_address: the address of the lower of the two registers. Second register
98 * is assumed to have address one greater.
99 * @val: somewhere to pass back the value read
101 static int adis16209_spi_read_reg_16(struct iio_dev *indio_dev,
102 u8 lower_reg_address,
105 struct spi_message msg;
106 struct adis16209_state *st = iio_priv(indio_dev);
108 struct spi_transfer xfers[] = {
123 mutex_lock(&st->buf_lock);
124 st->tx[0] = ADIS16209_READ_REG(lower_reg_address);
127 spi_message_init(&msg);
128 spi_message_add_tail(&xfers[0], &msg);
129 spi_message_add_tail(&xfers[1], &msg);
130 ret = spi_sync(st->us, &msg);
132 dev_err(&st->us->dev,
133 "problem when reading 16 bit register 0x%02X",
137 *val = (st->rx[0] << 8) | st->rx[1];
140 mutex_unlock(&st->buf_lock);
144 static int adis16209_reset(struct iio_dev *indio_dev)
147 ret = adis16209_spi_write_reg_8(indio_dev,
149 ADIS16209_GLOB_CMD_SW_RESET);
151 dev_err(&indio_dev->dev, "problem resetting device");
156 static ssize_t adis16209_write_reset(struct device *dev,
157 struct device_attribute *attr,
158 const char *buf, size_t len)
160 struct iio_dev *indio_dev = dev_get_drvdata(dev);
168 return adis16209_reset(indio_dev);
173 int adis16209_set_irq(struct iio_dev *indio_dev, bool enable)
178 ret = adis16209_spi_read_reg_16(indio_dev, ADIS16209_MSC_CTRL, &msc);
182 msc |= ADIS16209_MSC_CTRL_ACTIVE_HIGH;
183 msc &= ~ADIS16209_MSC_CTRL_DATA_RDY_DIO2;
185 msc |= ADIS16209_MSC_CTRL_DATA_RDY_EN;
187 msc &= ~ADIS16209_MSC_CTRL_DATA_RDY_EN;
189 ret = adis16209_spi_write_reg_16(indio_dev, ADIS16209_MSC_CTRL, msc);
195 static int adis16209_check_status(struct iio_dev *indio_dev)
200 ret = adis16209_spi_read_reg_16(indio_dev,
201 ADIS16209_DIAG_STAT, &status);
203 dev_err(&indio_dev->dev, "Reading status failed\n");
208 if (status & ADIS16209_DIAG_STAT_SELFTEST_FAIL)
209 dev_err(&indio_dev->dev, "Self test failure\n");
210 if (status & ADIS16209_DIAG_STAT_SPI_FAIL)
211 dev_err(&indio_dev->dev, "SPI failure\n");
212 if (status & ADIS16209_DIAG_STAT_FLASH_UPT)
213 dev_err(&indio_dev->dev, "Flash update failed\n");
214 if (status & ADIS16209_DIAG_STAT_POWER_HIGH)
215 dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
216 if (status & ADIS16209_DIAG_STAT_POWER_LOW)
217 dev_err(&indio_dev->dev, "Power supply below 3.15V\n");
223 static int adis16209_self_test(struct iio_dev *indio_dev)
226 ret = adis16209_spi_write_reg_16(indio_dev,
228 ADIS16209_MSC_CTRL_SELF_TEST_EN);
230 dev_err(&indio_dev->dev, "problem starting self test");
234 adis16209_check_status(indio_dev);
240 static int adis16209_initial_setup(struct iio_dev *indio_dev)
245 ret = adis16209_set_irq(indio_dev, false);
247 dev_err(&indio_dev->dev, "disable irq failed");
252 ret = adis16209_self_test(indio_dev);
254 dev_err(&indio_dev->dev, "self test failure");
258 /* Read status register to check the result */
259 ret = adis16209_check_status(indio_dev);
261 adis16209_reset(indio_dev);
262 dev_err(&indio_dev->dev, "device not playing ball -> reset");
263 msleep(ADIS16209_STARTUP_DELAY);
264 ret = adis16209_check_status(indio_dev);
266 dev_err(&indio_dev->dev, "giving up");
275 enum adis16209_chan {
286 static const u8 adis16209_addresses[8][2] = {
287 [in_supply] = { ADIS16209_SUPPLY_OUT },
288 [in_aux] = { ADIS16209_AUX_ADC },
289 [accel_x] = { ADIS16209_XACCL_OUT, ADIS16209_XACCL_NULL },
290 [accel_y] = { ADIS16209_YACCL_OUT, ADIS16209_YACCL_NULL },
291 [incli_x] = { ADIS16209_XINCL_OUT, ADIS16209_XINCL_NULL },
292 [incli_y] = { ADIS16209_YINCL_OUT, ADIS16209_YINCL_NULL },
293 [rot] = { ADIS16209_ROT_OUT },
294 [temp] = { ADIS16209_TEMP_OUT },
297 static int adis16209_write_raw(struct iio_dev *indio_dev,
298 struct iio_chan_spec const *chan,
307 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
308 switch (chan->type) {
316 val16 = val & ((1 << bits) - 1);
317 addr = adis16209_addresses[chan->address][1];
318 return adis16209_spi_write_reg_16(indio_dev, addr, val16);
323 static int adis16209_read_raw(struct iio_dev *indio_dev,
324 struct iio_chan_spec const *chan,
335 mutex_lock(&indio_dev->mlock);
336 addr = adis16209_addresses[chan->address][0];
337 ret = adis16209_spi_read_reg_16(indio_dev, addr, &val16);
339 mutex_unlock(&indio_dev->mlock);
343 if (val16 & ADIS16209_ERROR_ACTIVE) {
344 ret = adis16209_check_status(indio_dev);
346 mutex_unlock(&indio_dev->mlock);
350 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
351 if (chan->scan_type.sign == 's')
352 val16 = (s16)(val16 <<
353 (16 - chan->scan_type.realbits)) >>
354 (16 - chan->scan_type.realbits);
356 mutex_unlock(&indio_dev->mlock);
358 case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
359 case (1 << IIO_CHAN_INFO_SCALE_SHARED):
360 switch (chan->type) {
363 if (chan->channel == 0)
367 return IIO_VAL_INT_PLUS_MICRO;
371 return IIO_VAL_INT_PLUS_MICRO;
375 return IIO_VAL_INT_PLUS_MICRO;
379 return IIO_VAL_INT_PLUS_MICRO;
384 case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
387 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
388 switch (chan->type) {
395 mutex_lock(&indio_dev->mlock);
396 addr = adis16209_addresses[chan->address][1];
397 ret = adis16209_spi_read_reg_16(indio_dev, addr, &val16);
399 mutex_unlock(&indio_dev->mlock);
402 val16 &= (1 << bits) - 1;
403 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
405 mutex_unlock(&indio_dev->mlock);
411 static struct iio_chan_spec adis16209_channels[] = {
412 IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0,
413 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
414 in_supply, ADIS16209_SCAN_SUPPLY,
415 IIO_ST('u', 14, 16, 0), 0),
416 IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0,
417 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
418 (1 << IIO_CHAN_INFO_OFFSET_SEPARATE),
419 temp, ADIS16209_SCAN_TEMP,
420 IIO_ST('u', 12, 16, 0), 0),
421 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X,
422 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
423 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
424 accel_x, ADIS16209_SCAN_ACC_X,
425 IIO_ST('s', 14, 16, 0), 0),
426 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y,
427 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
428 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
429 accel_y, ADIS16209_SCAN_ACC_Y,
430 IIO_ST('s', 14, 16, 0), 0),
431 IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
432 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
433 in_aux, ADIS16209_SCAN_AUX_ADC,
434 IIO_ST('u', 12, 16, 0), 0),
435 IIO_CHAN(IIO_INCLI, 0, 1, 0, NULL, 0, IIO_MOD_X,
436 (1 << IIO_CHAN_INFO_SCALE_SHARED),
437 incli_x, ADIS16209_SCAN_INCLI_X,
438 IIO_ST('s', 14, 16, 0), 0),
439 IIO_CHAN(IIO_INCLI, 0, 1, 0, NULL, 0, IIO_MOD_Y,
440 (1 << IIO_CHAN_INFO_SCALE_SHARED),
441 incli_y, ADIS16209_SCAN_INCLI_Y,
442 IIO_ST('s', 14, 16, 0), 0),
443 IIO_CHAN(IIO_ROT, 0, 1, 0, NULL, 0, IIO_MOD_X,
445 rot, ADIS16209_SCAN_ROT,
446 IIO_ST('s', 14, 16, 0), 0),
447 IIO_CHAN_SOFT_TIMESTAMP(8)
450 static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16209_write_reset, 0);
452 static struct attribute *adis16209_attributes[] = {
453 &iio_dev_attr_reset.dev_attr.attr,
457 static const struct attribute_group adis16209_attribute_group = {
458 .attrs = adis16209_attributes,
461 static const struct iio_info adis16209_info = {
462 .attrs = &adis16209_attribute_group,
463 .read_raw = &adis16209_read_raw,
464 .write_raw = &adis16209_write_raw,
465 .driver_module = THIS_MODULE,
468 static int __devinit adis16209_probe(struct spi_device *spi)
471 struct adis16209_state *st;
472 struct iio_dev *indio_dev;
474 /* setup the industrialio driver allocated elements */
475 indio_dev = iio_allocate_device(sizeof(*st));
476 if (indio_dev == NULL) {
480 st = iio_priv(indio_dev);
481 /* this is only used for removal purposes */
482 spi_set_drvdata(spi, indio_dev);
484 mutex_init(&st->buf_lock);
486 indio_dev->name = spi->dev.driver->name;
487 indio_dev->dev.parent = &spi->dev;
488 indio_dev->info = &adis16209_info;
489 indio_dev->channels = adis16209_channels;
490 indio_dev->num_channels = ARRAY_SIZE(adis16209_channels);
491 indio_dev->modes = INDIO_DIRECT_MODE;
493 ret = adis16209_configure_ring(indio_dev);
497 ret = iio_ring_buffer_register(indio_dev,
499 ARRAY_SIZE(adis16209_channels));
501 printk(KERN_ERR "failed to initialize the ring\n");
502 goto error_unreg_ring_funcs;
506 ret = adis16209_probe_trigger(indio_dev);
508 goto error_uninitialize_ring;
511 /* Get the device into a sane initial state */
512 ret = adis16209_initial_setup(indio_dev);
514 goto error_remove_trigger;
515 ret = iio_device_register(indio_dev);
517 goto error_remove_trigger;
521 error_remove_trigger:
522 adis16209_remove_trigger(indio_dev);
523 error_uninitialize_ring:
524 iio_ring_buffer_unregister(indio_dev);
525 error_unreg_ring_funcs:
526 adis16209_unconfigure_ring(indio_dev);
528 iio_free_device(indio_dev);
533 static int adis16209_remove(struct spi_device *spi)
535 struct iio_dev *indio_dev = spi_get_drvdata(spi);
537 flush_scheduled_work();
539 adis16209_remove_trigger(indio_dev);
540 iio_ring_buffer_unregister(indio_dev);
541 adis16209_unconfigure_ring(indio_dev);
542 iio_device_unregister(indio_dev);
547 static struct spi_driver adis16209_driver = {
550 .owner = THIS_MODULE,
552 .probe = adis16209_probe,
553 .remove = __devexit_p(adis16209_remove),
556 static __init int adis16209_init(void)
558 return spi_register_driver(&adis16209_driver);
560 module_init(adis16209_init);
562 static __exit void adis16209_exit(void)
564 spi_unregister_driver(&adis16209_driver);
566 module_exit(adis16209_exit);
568 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
569 MODULE_DESCRIPTION("Analog Devices ADIS16209 Digital Vibration Sensor driver");
570 MODULE_LICENSE("GPL v2");