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"
27 #define DRIVER_NAME "adis16201"
40 * adis16201_spi_write_reg_8() - write single byte to a register
41 * @dev: device associated with child of actual device (iio_dev or iio_trig)
42 * @reg_address: the address of the register to be written
43 * @val: the value to write
45 static int adis16201_spi_write_reg_8(struct device *dev,
50 struct iio_dev *indio_dev = dev_get_drvdata(dev);
51 struct adis16201_state *st = iio_dev_get_devdata(indio_dev);
53 mutex_lock(&st->buf_lock);
54 st->tx[0] = ADIS16201_WRITE_REG(reg_address);
57 ret = spi_write(st->us, st->tx, 2);
58 mutex_unlock(&st->buf_lock);
64 * adis16201_spi_write_reg_16() - write 2 bytes to a pair of registers
65 * @indio_dev: iio device associated with child of actual device
66 * @reg_address: the address of the lower of the two registers. Second register
67 * is assumed to have address one greater.
68 * @val: value to be written
70 static int adis16201_spi_write_reg_16(struct iio_dev *indio_dev,
75 struct spi_message msg;
76 struct adis16201_state *st = iio_dev_get_devdata(indio_dev);
77 struct spi_transfer xfers[] = {
90 mutex_lock(&st->buf_lock);
91 st->tx[0] = ADIS16201_WRITE_REG(lower_reg_address);
92 st->tx[1] = value & 0xFF;
93 st->tx[2] = ADIS16201_WRITE_REG(lower_reg_address + 1);
94 st->tx[3] = (value >> 8) & 0xFF;
96 spi_message_init(&msg);
97 spi_message_add_tail(&xfers[0], &msg);
98 spi_message_add_tail(&xfers[1], &msg);
99 ret = spi_sync(st->us, &msg);
100 mutex_unlock(&st->buf_lock);
106 * adis16201_spi_read_reg_16() - read 2 bytes from a 16-bit register
107 * @indio_dev: iio device associated with child of actual device
108 * @reg_address: the address of the lower of the two registers. Second register
109 * is assumed to have address one greater.
110 * @val: somewhere to pass back the value read
112 static int adis16201_spi_read_reg_16(struct iio_dev *indio_dev,
113 u8 lower_reg_address,
116 struct spi_message msg;
117 struct adis16201_state *st = iio_dev_get_devdata(indio_dev);
119 struct spi_transfer xfers[] = {
134 mutex_lock(&st->buf_lock);
135 st->tx[0] = ADIS16201_READ_REG(lower_reg_address);
138 spi_message_init(&msg);
139 spi_message_add_tail(&xfers[0], &msg);
140 spi_message_add_tail(&xfers[1], &msg);
141 ret = spi_sync(st->us, &msg);
143 dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
147 *val = (st->rx[0] << 8) | st->rx[1];
150 mutex_unlock(&st->buf_lock);
154 static int adis16201_reset(struct device *dev)
157 ret = adis16201_spi_write_reg_8(dev,
159 ADIS16201_GLOB_CMD_SW_RESET);
161 dev_err(dev, "problem resetting device");
166 static ssize_t adis16201_write_reset(struct device *dev,
167 struct device_attribute *attr,
168 const char *buf, size_t len)
176 return adis16201_reset(dev);
181 int adis16201_set_irq(struct iio_dev *indio_dev, bool enable)
186 ret = adis16201_spi_read_reg_16(indio_dev, ADIS16201_MSC_CTRL, &msc);
190 msc |= ADIS16201_MSC_CTRL_ACTIVE_HIGH;
191 msc &= ~ADIS16201_MSC_CTRL_DATA_RDY_DIO1;
193 msc |= ADIS16201_MSC_CTRL_DATA_RDY_EN;
195 msc &= ~ADIS16201_MSC_CTRL_DATA_RDY_EN;
197 ret = adis16201_spi_write_reg_16(indio_dev, ADIS16201_MSC_CTRL, msc);
203 static int adis16201_check_status(struct iio_dev *indio_dev)
208 ret = adis16201_spi_read_reg_16(indio_dev,
209 ADIS16201_DIAG_STAT, &status);
211 dev_err(&indio_dev->dev, "Reading status failed\n");
218 if (status & ADIS16201_DIAG_STAT_SPI_FAIL)
219 dev_err(&indio_dev->dev, "SPI failure\n");
220 if (status & ADIS16201_DIAG_STAT_FLASH_UPT)
221 dev_err(&indio_dev->dev, "Flash update failed\n");
222 if (status & ADIS16201_DIAG_STAT_POWER_HIGH)
223 dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
224 if (status & ADIS16201_DIAG_STAT_POWER_LOW)
225 dev_err(&indio_dev->dev, "Power supply below 3.15V\n");
231 static int adis16201_self_test(struct iio_dev *indio_dev)
234 ret = adis16201_spi_write_reg_16(indio_dev,
236 ADIS16201_MSC_CTRL_SELF_TEST_EN);
238 dev_err(&indio_dev->dev, "problem starting self test");
242 ret = adis16201_check_status(indio_dev);
248 static int adis16201_initial_setup(struct adis16201_state *st)
251 struct device *dev = &st->indio_dev->dev;
254 ret = adis16201_set_irq(st->indio_dev, false);
256 dev_err(dev, "disable irq failed");
261 ret = adis16201_self_test(st->indio_dev);
263 dev_err(dev, "self test failure");
267 /* Read status register to check the result */
268 ret = adis16201_check_status(st->indio_dev);
270 adis16201_reset(dev);
271 dev_err(dev, "device not playing ball -> reset");
272 msleep(ADIS16201_STARTUP_DELAY);
273 ret = adis16201_check_status(st->indio_dev);
275 dev_err(dev, "giving up");
280 printk(KERN_INFO DRIVER_NAME ": at CS%d (irq %d)\n",
281 st->us->chip_select, st->us->irq);
287 static u8 adis16201_addresses[7][2] = {
288 [in_supply] = { ADIS16201_SUPPLY_OUT, },
289 [temp] = { ADIS16201_TEMP_OUT },
290 [accel_x] = { ADIS16201_XACCL_OUT, ADIS16201_XACCL_OFFS },
291 [accel_y] = { ADIS16201_YACCL_OUT, ADIS16201_YACCL_OFFS },
292 [in_aux] = { ADIS16201_AUX_ADC },
293 [incli_x] = { ADIS16201_XINCL_OUT },
294 [incli_y] = { ADIS16201_YINCL_OUT },
297 static int adis16201_read_raw(struct iio_dev *indio_dev,
298 struct iio_chan_spec const *chan,
309 mutex_lock(&indio_dev->mlock);
310 addr = adis16201_addresses[chan->address][0];
311 ret = adis16201_spi_read_reg_16(indio_dev, addr, &val16);
315 if (val16 & ADIS16201_ERROR_ACTIVE) {
316 ret = adis16201_check_status(indio_dev);
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 = kzalloc(sizeof *st, GFP_KERNEL);
475 /* this is only used for removal purposes */
476 spi_set_drvdata(spi, st);
478 /* Allocate the comms buffers */
479 st->rx = kzalloc(sizeof(*st->rx)*ADIS16201_MAX_RX, GFP_KERNEL);
480 if (st->rx == NULL) {
484 st->tx = kzalloc(sizeof(*st->tx)*ADIS16201_MAX_TX, GFP_KERNEL);
485 if (st->tx == NULL) {
490 mutex_init(&st->buf_lock);
491 /* setup the industrialio driver allocated elements */
492 st->indio_dev = iio_allocate_device(0);
493 if (st->indio_dev == NULL) {
498 st->indio_dev->name = spi->dev.driver->name;
499 st->indio_dev->dev.parent = &spi->dev;
500 st->indio_dev->info = &adis16201_info;
502 st->indio_dev->channels = adis16201_channels;
503 st->indio_dev->num_channels = ARRAY_SIZE(adis16201_channels);
504 st->indio_dev->dev_data = (void *)(st);
505 st->indio_dev->modes = INDIO_DIRECT_MODE;
507 ret = adis16201_configure_ring(st->indio_dev);
511 ret = iio_device_register(st->indio_dev);
513 goto error_unreg_ring_funcs;
516 ret = iio_ring_buffer_register_ex(st->indio_dev->ring, 0,
518 ARRAY_SIZE(adis16201_channels));
520 printk(KERN_ERR "failed to initialize the ring\n");
521 goto error_unreg_ring_funcs;
525 ret = adis16201_probe_trigger(st->indio_dev);
527 goto error_uninitialize_ring;
530 /* Get the device into a sane initial state */
531 ret = adis16201_initial_setup(st);
533 goto error_remove_trigger;
536 error_remove_trigger:
537 adis16201_remove_trigger(st->indio_dev);
538 error_uninitialize_ring:
539 iio_ring_buffer_unregister(st->indio_dev->ring);
540 error_unreg_ring_funcs:
541 adis16201_unconfigure_ring(st->indio_dev);
544 iio_device_unregister(st->indio_dev);
546 iio_free_device(st->indio_dev);
557 static int adis16201_remove(struct spi_device *spi)
559 struct adis16201_state *st = spi_get_drvdata(spi);
560 struct iio_dev *indio_dev = st->indio_dev;
562 adis16201_remove_trigger(indio_dev);
563 iio_ring_buffer_unregister(indio_dev->ring);
564 iio_device_unregister(indio_dev);
565 adis16201_unconfigure_ring(indio_dev);
573 static struct spi_driver adis16201_driver = {
576 .owner = THIS_MODULE,
578 .probe = adis16201_probe,
579 .remove = __devexit_p(adis16201_remove),
582 static __init int adis16201_init(void)
584 return spi_register_driver(&adis16201_driver);
586 module_init(adis16201_init);
588 static __exit void adis16201_exit(void)
590 spi_unregister_driver(&adis16201_driver);
592 module_exit(adis16201_exit);
594 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
595 MODULE_DESCRIPTION("Analog Devices ADIS16201 Programmable Digital Vibration Sensor driver");
596 MODULE_LICENSE("GPL v2");