2 * ADIS16201 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>
19 #include "../ring_generic.h"
22 #include "inclinometer.h"
23 #include "../adc/adc.h"
25 #include "adis16201.h"
38 * adis16201_spi_write_reg_8() - write single byte to a register
39 * @dev: device associated with child of actual device (iio_dev or iio_trig)
40 * @reg_address: the address of the register to be written
41 * @val: the value to write
43 static int adis16201_spi_write_reg_8(struct iio_dev *indio_dev,
48 struct adis16201_state *st = iio_priv(indio_dev);
50 mutex_lock(&st->buf_lock);
51 st->tx[0] = ADIS16201_WRITE_REG(reg_address);
54 ret = spi_write(st->us, st->tx, 2);
55 mutex_unlock(&st->buf_lock);
61 * adis16201_spi_write_reg_16() - write 2 bytes to a pair of registers
62 * @indio_dev: iio device associated with child of actual device
63 * @reg_address: the address of the lower of the two registers. Second register
64 * is assumed to have address one greater.
65 * @val: value to be written
67 static int adis16201_spi_write_reg_16(struct iio_dev *indio_dev,
72 struct spi_message msg;
73 struct adis16201_state *st = iio_priv(indio_dev);
74 struct spi_transfer xfers[] = {
87 mutex_lock(&st->buf_lock);
88 st->tx[0] = ADIS16201_WRITE_REG(lower_reg_address);
89 st->tx[1] = value & 0xFF;
90 st->tx[2] = ADIS16201_WRITE_REG(lower_reg_address + 1);
91 st->tx[3] = (value >> 8) & 0xFF;
93 spi_message_init(&msg);
94 spi_message_add_tail(&xfers[0], &msg);
95 spi_message_add_tail(&xfers[1], &msg);
96 ret = spi_sync(st->us, &msg);
97 mutex_unlock(&st->buf_lock);
103 * adis16201_spi_read_reg_16() - read 2 bytes from a 16-bit register
104 * @indio_dev: iio device associated with child of actual device
105 * @reg_address: the address of the lower of the two registers. Second register
106 * is assumed to have address one greater.
107 * @val: somewhere to pass back the value read
109 static int adis16201_spi_read_reg_16(struct iio_dev *indio_dev,
110 u8 lower_reg_address,
113 struct spi_message msg;
114 struct adis16201_state *st = iio_priv(indio_dev);
116 struct spi_transfer xfers[] = {
131 mutex_lock(&st->buf_lock);
132 st->tx[0] = ADIS16201_READ_REG(lower_reg_address);
135 spi_message_init(&msg);
136 spi_message_add_tail(&xfers[0], &msg);
137 spi_message_add_tail(&xfers[1], &msg);
138 ret = spi_sync(st->us, &msg);
140 dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
144 *val = (st->rx[0] << 8) | st->rx[1];
147 mutex_unlock(&st->buf_lock);
151 static int adis16201_reset(struct iio_dev *indio_dev)
154 struct adis16201_state *st = iio_priv(indio_dev);
156 ret = adis16201_spi_write_reg_8(indio_dev,
158 ADIS16201_GLOB_CMD_SW_RESET);
160 dev_err(&st->us->dev, "problem resetting device");
165 static ssize_t adis16201_write_reset(struct device *dev,
166 struct device_attribute *attr,
167 const char *buf, size_t len)
174 ret = strtobool(buf, &res);
177 return adis16201_reset(dev_get_drvdata(dev));
180 int adis16201_set_irq(struct iio_dev *indio_dev, bool enable)
185 ret = adis16201_spi_read_reg_16(indio_dev, ADIS16201_MSC_CTRL, &msc);
189 msc |= ADIS16201_MSC_CTRL_ACTIVE_HIGH;
190 msc &= ~ADIS16201_MSC_CTRL_DATA_RDY_DIO1;
192 msc |= ADIS16201_MSC_CTRL_DATA_RDY_EN;
194 msc &= ~ADIS16201_MSC_CTRL_DATA_RDY_EN;
196 ret = adis16201_spi_write_reg_16(indio_dev, ADIS16201_MSC_CTRL, msc);
202 static int adis16201_check_status(struct iio_dev *indio_dev)
207 ret = adis16201_spi_read_reg_16(indio_dev,
208 ADIS16201_DIAG_STAT, &status);
210 dev_err(&indio_dev->dev, "Reading status failed\n");
217 if (status & ADIS16201_DIAG_STAT_SPI_FAIL)
218 dev_err(&indio_dev->dev, "SPI failure\n");
219 if (status & ADIS16201_DIAG_STAT_FLASH_UPT)
220 dev_err(&indio_dev->dev, "Flash update failed\n");
221 if (status & ADIS16201_DIAG_STAT_POWER_HIGH)
222 dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
223 if (status & ADIS16201_DIAG_STAT_POWER_LOW)
224 dev_err(&indio_dev->dev, "Power supply below 3.15V\n");
230 static int adis16201_self_test(struct iio_dev *indio_dev)
233 ret = adis16201_spi_write_reg_16(indio_dev,
235 ADIS16201_MSC_CTRL_SELF_TEST_EN);
237 dev_err(&indio_dev->dev, "problem starting self test");
241 ret = adis16201_check_status(indio_dev);
247 static int adis16201_initial_setup(struct iio_dev *indio_dev)
250 struct device *dev = &indio_dev->dev;
253 ret = adis16201_set_irq(indio_dev, false);
255 dev_err(dev, "disable irq failed");
260 ret = adis16201_self_test(indio_dev);
262 dev_err(dev, "self test failure");
266 /* Read status register to check the result */
267 ret = adis16201_check_status(indio_dev);
269 adis16201_reset(indio_dev);
270 dev_err(dev, "device not playing ball -> reset");
271 msleep(ADIS16201_STARTUP_DELAY);
272 ret = adis16201_check_status(indio_dev);
274 dev_err(dev, "giving up");
283 static u8 adis16201_addresses[7][2] = {
284 [in_supply] = { ADIS16201_SUPPLY_OUT, },
285 [temp] = { ADIS16201_TEMP_OUT },
286 [accel_x] = { ADIS16201_XACCL_OUT, ADIS16201_XACCL_OFFS },
287 [accel_y] = { ADIS16201_YACCL_OUT, ADIS16201_YACCL_OFFS },
288 [in_aux] = { ADIS16201_AUX_ADC },
289 [incli_x] = { ADIS16201_XINCL_OUT },
290 [incli_y] = { ADIS16201_YINCL_OUT },
293 static int adis16201_read_raw(struct iio_dev *indio_dev,
294 struct iio_chan_spec const *chan,
305 mutex_lock(&indio_dev->mlock);
306 addr = adis16201_addresses[chan->address][0];
307 ret = adis16201_spi_read_reg_16(indio_dev, addr, &val16);
309 mutex_unlock(&indio_dev->mlock);
313 if (val16 & ADIS16201_ERROR_ACTIVE) {
314 ret = adis16201_check_status(indio_dev);
316 mutex_unlock(&indio_dev->mlock);
320 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
321 if (chan->scan_type.sign == 's')
322 val16 = (s16)(val16 <<
323 (16 - chan->scan_type.realbits)) >>
324 (16 - chan->scan_type.realbits);
326 mutex_unlock(&indio_dev->mlock);
328 case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
329 case (1 << IIO_CHAN_INFO_SCALE_SHARED):
330 switch (chan->type) {
333 if (chan->channel == 0)
337 return IIO_VAL_INT_PLUS_MICRO;
341 return IIO_VAL_INT_PLUS_MICRO;
345 return IIO_VAL_INT_PLUS_MICRO;
349 return IIO_VAL_INT_PLUS_MICRO;
354 case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
357 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
358 switch (chan->type) {
368 mutex_lock(&indio_dev->mlock);
369 addr = adis16201_addresses[chan->address][1];
370 ret = adis16201_spi_read_reg_16(indio_dev, addr, &val16);
372 mutex_unlock(&indio_dev->mlock);
375 val16 &= (1 << bits) - 1;
376 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
378 mutex_unlock(&indio_dev->mlock);
384 static int adis16201_write_raw(struct iio_dev *indio_dev,
385 struct iio_chan_spec const *chan,
394 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
395 switch (chan->type) {
405 val16 = val & ((1 << bits) - 1);
406 addr = adis16201_addresses[chan->address][1];
407 return adis16201_spi_write_reg_16(indio_dev, addr, val16);
412 static struct iio_chan_spec adis16201_channels[] = {
413 IIO_CHAN(IIO_IN, 0, 1, 0, "supply", 0, 0,
414 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
415 in_supply, ADIS16201_SCAN_SUPPLY,
416 IIO_ST('u', 12, 16, 0), 0),
417 IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0,
418 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
419 (1 << IIO_CHAN_INFO_OFFSET_SEPARATE),
420 temp, ADIS16201_SCAN_TEMP,
421 IIO_ST('u', 12, 16, 0), 0),
422 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X,
423 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
424 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
425 accel_x, ADIS16201_SCAN_ACC_X,
426 IIO_ST('s', 14, 16, 0), 0),
427 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y,
428 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
429 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
430 accel_y, ADIS16201_SCAN_ACC_Y,
431 IIO_ST('s', 14, 16, 0), 0),
432 IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
433 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
434 in_aux, ADIS16201_SCAN_AUX_ADC,
435 IIO_ST('u', 12, 16, 0), 0),
436 IIO_CHAN(IIO_INCLI, 1, 0, 0, NULL, 0, IIO_MOD_X,
437 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
438 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
439 incli_x, ADIS16201_SCAN_INCLI_X,
440 IIO_ST('s', 14, 16, 0), 0),
441 IIO_CHAN(IIO_INCLI, 1, 0, 0, NULL, 0, IIO_MOD_Y,
442 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
443 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
444 incli_y, ADIS16201_SCAN_INCLI_Y,
445 IIO_ST('s', 14, 16, 0), 0),
446 IIO_CHAN_SOFT_TIMESTAMP(7)
449 static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16201_write_reset, 0);
451 static struct attribute *adis16201_attributes[] = {
452 &iio_dev_attr_reset.dev_attr.attr,
456 static const struct attribute_group adis16201_attribute_group = {
457 .attrs = adis16201_attributes,
460 static const struct iio_info adis16201_info = {
461 .attrs = &adis16201_attribute_group,
462 .read_raw = &adis16201_read_raw,
463 .write_raw = &adis16201_write_raw,
464 .driver_module = THIS_MODULE,
467 static int __devinit adis16201_probe(struct spi_device *spi)
469 int ret, regdone = 0;
470 struct adis16201_state *st;
471 struct iio_dev *indio_dev;
473 /* setup the industrialio driver allocated elements */
474 indio_dev = iio_allocate_device(sizeof(*st));
475 if (indio_dev == NULL) {
479 st = iio_priv(indio_dev);
480 /* this is only used for removal purposes */
481 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 = &adis16201_info;
490 indio_dev->channels = adis16201_channels;
491 indio_dev->num_channels = ARRAY_SIZE(adis16201_channels);
492 indio_dev->modes = INDIO_DIRECT_MODE;
494 ret = adis16201_configure_ring(indio_dev);
498 ret = iio_device_register(indio_dev);
500 goto error_unreg_ring_funcs;
503 ret = iio_ring_buffer_register_ex(indio_dev->ring, 0,
505 ARRAY_SIZE(adis16201_channels));
507 printk(KERN_ERR "failed to initialize the ring\n");
508 goto error_unreg_ring_funcs;
512 ret = adis16201_probe_trigger(indio_dev);
514 goto error_uninitialize_ring;
517 /* Get the device into a sane initial state */
518 ret = adis16201_initial_setup(indio_dev);
520 goto error_remove_trigger;
523 error_remove_trigger:
524 adis16201_remove_trigger(indio_dev);
525 error_uninitialize_ring:
526 iio_ring_buffer_unregister(indio_dev->ring);
527 error_unreg_ring_funcs:
528 adis16201_unconfigure_ring(indio_dev);
531 iio_device_unregister(indio_dev);
533 iio_free_device(indio_dev);
538 static int adis16201_remove(struct spi_device *spi)
540 struct iio_dev *indio_dev = spi_get_drvdata(spi);
542 adis16201_remove_trigger(indio_dev);
543 iio_ring_buffer_unregister(indio_dev->ring);
544 iio_device_unregister(indio_dev);
545 adis16201_unconfigure_ring(indio_dev);
550 static struct spi_driver adis16201_driver = {
553 .owner = THIS_MODULE,
555 .probe = adis16201_probe,
556 .remove = __devexit_p(adis16201_remove),
559 static __init int adis16201_init(void)
561 return spi_register_driver(&adis16201_driver);
563 module_init(adis16201_init);
565 static __exit void adis16201_exit(void)
567 spi_unregister_driver(&adis16201_driver);
569 module_exit(adis16201_exit);
571 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
572 MODULE_DESCRIPTION("Analog Devices ADIS16201 Programmable Digital Vibration Sensor driver");
573 MODULE_LICENSE("GPL v2");