2 * ADIS16203 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 "inclinometer.h"
22 #include "../ring_generic.h"
23 #include "../adc/adc.h"
25 #include "adis16203.h"
27 #define DRIVER_NAME "adis16203"
30 * adis16203_spi_write_reg_8() - write single byte to a register
31 * @indio_dev: iio device associated with child of actual device
32 * @reg_address: the address of the register to be written
33 * @val: the value to write
35 static int adis16203_spi_write_reg_8(struct iio_dev *indio_dev,
40 struct adis16203_state *st = iio_priv(indio_dev);
42 mutex_lock(&st->buf_lock);
43 st->tx[0] = ADIS16203_WRITE_REG(reg_address);
46 ret = spi_write(st->us, st->tx, 2);
47 mutex_unlock(&st->buf_lock);
53 * adis16203_spi_write_reg_16() - write 2 bytes to a pair of registers
54 * @indio_dev: iio device associated with child of actual device
55 * @reg_address: the address of the lower of the two registers. Second register
56 * is assumed to have address one greater.
57 * @val: value to be written
59 static int adis16203_spi_write_reg_16(struct iio_dev *indio_dev,
64 struct spi_message msg;
65 struct adis16203_state *st = iio_priv(indio_dev);
66 struct spi_transfer xfers[] = {
79 mutex_lock(&st->buf_lock);
80 st->tx[0] = ADIS16203_WRITE_REG(lower_reg_address);
81 st->tx[1] = value & 0xFF;
82 st->tx[2] = ADIS16203_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 * adis16203_spi_read_reg_16() - read 2 bytes from a 16-bit register
96 * @indio_dev: iio device associated with child of actual 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 adis16203_spi_read_reg_16(struct iio_dev *indio_dev,
102 u8 lower_reg_address,
105 struct spi_message msg;
106 struct adis16203_state *st = iio_priv(indio_dev);
108 struct spi_transfer xfers[] = {
123 mutex_lock(&st->buf_lock);
124 st->tx[0] = ADIS16203_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, "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 int adis16203_check_status(struct iio_dev *indio_dev)
148 ret = adis16203_spi_read_reg_16(indio_dev,
152 dev_err(&indio_dev->dev, "Reading status failed\n");
157 if (status & ADIS16203_DIAG_STAT_SELFTEST_FAIL)
158 dev_err(&indio_dev->dev, "Self test failure\n");
159 if (status & ADIS16203_DIAG_STAT_SPI_FAIL)
160 dev_err(&indio_dev->dev, "SPI failure\n");
161 if (status & ADIS16203_DIAG_STAT_FLASH_UPT)
162 dev_err(&indio_dev->dev, "Flash update failed\n");
163 if (status & ADIS16203_DIAG_STAT_POWER_HIGH)
164 dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
165 if (status & ADIS16203_DIAG_STAT_POWER_LOW)
166 dev_err(&indio_dev->dev, "Power supply below 3.15V\n");
172 static int adis16203_reset(struct iio_dev *indio_dev)
175 ret = adis16203_spi_write_reg_8(indio_dev,
177 ADIS16203_GLOB_CMD_SW_RESET);
179 dev_err(&indio_dev->dev, "problem resetting device");
184 static ssize_t adis16203_write_reset(struct device *dev,
185 struct device_attribute *attr,
186 const char *buf, size_t len)
188 struct iio_dev *indio_dev = dev_get_drvdata(dev);
195 return adis16203_reset(indio_dev);
200 int adis16203_set_irq(struct iio_dev *indio_dev, bool enable)
205 ret = adis16203_spi_read_reg_16(indio_dev, ADIS16203_MSC_CTRL, &msc);
209 msc |= ADIS16203_MSC_CTRL_ACTIVE_HIGH;
210 msc &= ~ADIS16203_MSC_CTRL_DATA_RDY_DIO1;
212 msc |= ADIS16203_MSC_CTRL_DATA_RDY_EN;
214 msc &= ~ADIS16203_MSC_CTRL_DATA_RDY_EN;
216 ret = adis16203_spi_write_reg_16(indio_dev, ADIS16203_MSC_CTRL, msc);
222 static int adis16203_self_test(struct iio_dev *indio_dev)
225 ret = adis16203_spi_write_reg_16(indio_dev,
227 ADIS16203_MSC_CTRL_SELF_TEST_EN);
229 dev_err(&indio_dev->dev, "problem starting self test");
233 adis16203_check_status(indio_dev);
239 static int adis16203_initial_setup(struct iio_dev *indio_dev)
244 ret = adis16203_set_irq(indio_dev, false);
246 dev_err(&indio_dev->dev, "disable irq failed");
251 ret = adis16203_self_test(indio_dev);
253 dev_err(&indio_dev->dev, "self test failure");
257 /* Read status register to check the result */
258 ret = adis16203_check_status(indio_dev);
260 adis16203_reset(indio_dev);
261 dev_err(&indio_dev->dev, "device not playing ball -> reset");
262 msleep(ADIS16203_STARTUP_DELAY);
263 ret = adis16203_check_status(indio_dev);
265 dev_err(&indio_dev->dev, "giving up");
274 enum adis16203_chan {
282 static u8 adis16203_addresses[5][2] = {
283 [in_supply] = { ADIS16203_SUPPLY_OUT },
284 [in_aux] = { ADIS16203_AUX_ADC },
285 [incli_x] = { ADIS16203_XINCL_OUT, ADIS16203_INCL_NULL},
286 [incli_y] = { ADIS16203_YINCL_OUT },
287 [temp] = { ADIS16203_TEMP_OUT }
290 static int adis16203_write_raw(struct iio_dev *indio_dev,
291 struct iio_chan_spec const *chan,
296 /* currently only one writable parameter which keeps this simple */
297 u8 addr = adis16203_addresses[chan->address][1];
298 return adis16203_spi_write_reg_16(indio_dev, addr, val & 0x3FFF);
301 static int adis16203_read_raw(struct iio_dev *indio_dev,
302 struct iio_chan_spec const *chan,
312 mutex_lock(&indio_dev->mlock);
313 addr = adis16203_addresses[chan->address][0];
314 ret = adis16203_spi_read_reg_16(indio_dev, addr, &val16);
316 mutex_unlock(&indio_dev->mlock);
320 if (val16 & ADIS16203_ERROR_ACTIVE) {
321 ret = adis16203_check_status(indio_dev);
323 mutex_unlock(&indio_dev->mlock);
327 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
328 if (chan->scan_type.sign == 's')
329 val16 = (s16)(val16 <<
330 (16 - chan->scan_type.realbits)) >>
331 (16 - chan->scan_type.realbits);
333 mutex_unlock(&indio_dev->mlock);
335 case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
336 case (1 << IIO_CHAN_INFO_SCALE_SHARED):
337 switch (chan->type) {
340 if (chan->channel == 0)
344 return IIO_VAL_INT_PLUS_MICRO;
348 return IIO_VAL_INT_PLUS_MICRO;
352 return IIO_VAL_INT_PLUS_MICRO;
356 case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
359 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
361 mutex_lock(&indio_dev->mlock);
362 addr = adis16203_addresses[chan->address][1];
363 ret = adis16203_spi_read_reg_16(indio_dev, addr, &val16);
365 mutex_unlock(&indio_dev->mlock);
368 val16 &= (1 << bits) - 1;
369 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
371 mutex_unlock(&indio_dev->mlock);
378 static struct iio_chan_spec adis16203_channels[] = {
379 IIO_CHAN(IIO_IN, 0, 1, 0, "supply", 0, 0,
380 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
381 in_supply, ADIS16203_SCAN_SUPPLY,
382 IIO_ST('u', 12, 16, 0), 0),
383 IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
384 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
385 in_aux, ADIS16203_SCAN_AUX_ADC,
386 IIO_ST('u', 12, 16, 0), 0),
387 IIO_CHAN(IIO_INCLI, 1, 0, 0, NULL, 0, IIO_MOD_X,
388 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
389 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
390 incli_x, ADIS16203_SCAN_INCLI_X,
391 IIO_ST('s', 14, 16, 0), 0),
392 /* Fixme: Not what it appears to be - see data sheet */
393 IIO_CHAN(IIO_INCLI, 1, 0, 0, NULL, 0, IIO_MOD_Y,
394 (1 << IIO_CHAN_INFO_SCALE_SHARED),
395 incli_y, ADIS16203_SCAN_INCLI_Y,
396 IIO_ST('s', 14, 16, 0), 0),
397 IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0,
398 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
399 (1 << IIO_CHAN_INFO_OFFSET_SEPARATE),
400 temp, ADIS16203_SCAN_TEMP,
401 IIO_ST('u', 12, 16, 0), 0),
402 IIO_CHAN_SOFT_TIMESTAMP(5),
405 static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16203_write_reset, 0);
407 static struct attribute *adis16203_attributes[] = {
408 &iio_dev_attr_reset.dev_attr.attr,
412 static const struct attribute_group adis16203_attribute_group = {
413 .attrs = adis16203_attributes,
416 static const struct iio_info adis16203_info = {
417 .attrs = &adis16203_attribute_group,
418 .read_raw = &adis16203_read_raw,
419 .write_raw = &adis16203_write_raw,
420 .driver_module = THIS_MODULE,
423 static int __devinit adis16203_probe(struct spi_device *spi)
425 int ret, regdone = 0;
426 struct iio_dev *indio_dev;
427 struct adis16203_state *st;
429 /* setup the industrialio driver allocated elements */
430 indio_dev = iio_allocate_device(sizeof(*st));
431 if (indio_dev == NULL) {
435 st = iio_priv(indio_dev);
436 /* this is only used for removal purposes */
437 spi_set_drvdata(spi, indio_dev);
439 mutex_init(&st->buf_lock);
441 indio_dev->name = spi->dev.driver->name;
442 indio_dev->dev.parent = &spi->dev;
443 indio_dev->channels = adis16203_channels;
444 indio_dev->num_channels = ARRAY_SIZE(adis16203_channels);
445 indio_dev->info = &adis16203_info;
446 indio_dev->modes = INDIO_DIRECT_MODE;
448 ret = adis16203_configure_ring(indio_dev);
452 ret = iio_device_register(indio_dev);
454 goto error_unreg_ring_funcs;
457 ret = iio_ring_buffer_register_ex(indio_dev->ring, 0,
459 ARRAY_SIZE(adis16203_channels));
461 printk(KERN_ERR "failed to initialize the ring\n");
462 goto error_unreg_ring_funcs;
466 ret = adis16203_probe_trigger(indio_dev);
468 goto error_uninitialize_ring;
471 /* Get the device into a sane initial state */
472 ret = adis16203_initial_setup(indio_dev);
474 goto error_remove_trigger;
477 error_remove_trigger:
478 adis16203_remove_trigger(indio_dev);
479 error_uninitialize_ring:
480 iio_ring_buffer_unregister(indio_dev->ring);
481 error_unreg_ring_funcs:
482 adis16203_unconfigure_ring(indio_dev);
485 iio_device_unregister(indio_dev);
487 iio_free_device(indio_dev);
492 static int adis16203_remove(struct spi_device *spi)
494 struct iio_dev *indio_dev = spi_get_drvdata(spi);
496 adis16203_remove_trigger(indio_dev);
497 iio_ring_buffer_unregister(indio_dev->ring);
498 iio_device_unregister(indio_dev);
499 adis16203_unconfigure_ring(indio_dev);
504 static struct spi_driver adis16203_driver = {
507 .owner = THIS_MODULE,
509 .probe = adis16203_probe,
510 .remove = __devexit_p(adis16203_remove),
513 static __init int adis16203_init(void)
515 return spi_register_driver(&adis16203_driver);
517 module_init(adis16203_init);
519 static __exit void adis16203_exit(void)
521 spi_unregister_driver(&adis16203_driver);
523 module_exit(adis16203_exit);
525 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
526 MODULE_DESCRIPTION("Analog Devices ADIS16203 Programmable Digital Vibration Sensor driver");
527 MODULE_LICENSE("GPL v2");