2 * ADIS16204 Programmable High-g Digital Impact Sensor and Recorder
4 * Copyright 2010 Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
9 #include <linux/interrupt.h>
10 #include <linux/irq.h>
11 #include <linux/delay.h>
12 #include <linux/mutex.h>
13 #include <linux/device.h>
14 #include <linux/kernel.h>
15 #include <linux/spi/spi.h>
16 #include <linux/slab.h>
17 #include <linux/sysfs.h>
18 #include <linux/list.h>
19 #include <linux/module.h>
21 #include <linux/iio/iio.h>
22 #include <linux/iio/sysfs.h>
23 #include <linux/iio/buffer.h>
25 #include "adis16204.h"
27 #define DRIVER_NAME "adis16204"
30 * adis16204_spi_write_reg_8() - write single byte to a register
31 * @dev: device associated with child of actual device (iio_dev or iio_trig)
32 * @reg_address: the address of the register to be written
33 * @val: the value to write
35 static int adis16204_spi_write_reg_8(struct iio_dev *indio_dev,
40 struct adis16204_state *st = iio_priv(indio_dev);
42 mutex_lock(&st->buf_lock);
43 st->tx[0] = ADIS16204_WRITE_REG(reg_address);
46 ret = spi_write(st->us, st->tx, 2);
47 mutex_unlock(&st->buf_lock);
53 * adis16204_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 adis16204_spi_write_reg_16(struct iio_dev *indio_dev,
64 struct spi_message msg;
65 struct adis16204_state *st = iio_priv(indio_dev);
66 struct spi_transfer xfers[] = {
80 mutex_lock(&st->buf_lock);
81 st->tx[0] = ADIS16204_WRITE_REG(lower_reg_address);
82 st->tx[1] = value & 0xFF;
83 st->tx[2] = ADIS16204_WRITE_REG(lower_reg_address + 1);
84 st->tx[3] = (value >> 8) & 0xFF;
86 spi_message_init(&msg);
87 spi_message_add_tail(&xfers[0], &msg);
88 spi_message_add_tail(&xfers[1], &msg);
89 ret = spi_sync(st->us, &msg);
90 mutex_unlock(&st->buf_lock);
96 * adis16204_spi_read_reg_16() - read 2 bytes from a 16-bit register
97 * @indio_dev: iio device associated with child of actual device
98 * @reg_address: the address of the lower of the two registers. Second register
99 * is assumed to have address one greater.
100 * @val: somewhere to pass back the value read
102 static int adis16204_spi_read_reg_16(struct iio_dev *indio_dev,
103 u8 lower_reg_address,
106 struct spi_message msg;
107 struct adis16204_state *st = iio_priv(indio_dev);
109 struct spi_transfer xfers[] = {
124 mutex_lock(&st->buf_lock);
125 st->tx[0] = ADIS16204_READ_REG(lower_reg_address);
128 spi_message_init(&msg);
129 spi_message_add_tail(&xfers[0], &msg);
130 spi_message_add_tail(&xfers[1], &msg);
131 ret = spi_sync(st->us, &msg);
133 dev_err(&st->us->dev, "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 adis16204_check_status(struct iio_dev *indio_dev)
149 ret = adis16204_spi_read_reg_16(indio_dev,
150 ADIS16204_DIAG_STAT, &status);
152 dev_err(&indio_dev->dev, "Reading status failed\n");
157 if (status & ADIS16204_DIAG_STAT_SELFTEST_FAIL)
158 dev_err(&indio_dev->dev, "Self test failure\n");
159 if (status & ADIS16204_DIAG_STAT_SPI_FAIL)
160 dev_err(&indio_dev->dev, "SPI failure\n");
161 if (status & ADIS16204_DIAG_STAT_FLASH_UPT)
162 dev_err(&indio_dev->dev, "Flash update failed\n");
163 if (status & ADIS16204_DIAG_STAT_POWER_HIGH)
164 dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
165 if (status & ADIS16204_DIAG_STAT_POWER_LOW)
166 dev_err(&indio_dev->dev, "Power supply below 2.975V\n");
172 static ssize_t adis16204_read_14bit_signed(struct device *dev,
173 struct device_attribute *attr,
176 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
177 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
181 mutex_lock(&indio_dev->mlock);
183 ret = adis16204_spi_read_reg_16(indio_dev,
184 this_attr->address, (u16 *)&val);
186 if (val & ADIS16204_ERROR_ACTIVE)
187 adis16204_check_status(indio_dev);
189 val = ((s16)(val << 2) >> 2);
190 ret = sprintf(buf, "%d\n", val);
193 mutex_unlock(&indio_dev->mlock);
198 static int adis16204_reset(struct iio_dev *indio_dev)
201 ret = adis16204_spi_write_reg_8(indio_dev,
203 ADIS16204_GLOB_CMD_SW_RESET);
205 dev_err(&indio_dev->dev, "problem resetting device");
210 static ssize_t adis16204_write_reset(struct device *dev,
211 struct device_attribute *attr,
212 const char *buf, size_t len)
214 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
222 return adis16204_reset(indio_dev);
227 int adis16204_set_irq(struct iio_dev *indio_dev, bool enable)
232 ret = adis16204_spi_read_reg_16(indio_dev, ADIS16204_MSC_CTRL, &msc);
236 msc |= ADIS16204_MSC_CTRL_ACTIVE_HIGH;
237 msc &= ~ADIS16204_MSC_CTRL_DATA_RDY_DIO2;
239 msc |= ADIS16204_MSC_CTRL_DATA_RDY_EN;
241 msc &= ~ADIS16204_MSC_CTRL_DATA_RDY_EN;
243 ret = adis16204_spi_write_reg_16(indio_dev, ADIS16204_MSC_CTRL, msc);
249 static int adis16204_self_test(struct iio_dev *indio_dev)
252 ret = adis16204_spi_write_reg_16(indio_dev,
254 ADIS16204_MSC_CTRL_SELF_TEST_EN);
256 dev_err(&indio_dev->dev, "problem starting self test");
260 adis16204_check_status(indio_dev);
266 static int adis16204_initial_setup(struct iio_dev *indio_dev)
271 ret = adis16204_set_irq(indio_dev, false);
273 dev_err(&indio_dev->dev, "disable irq failed");
278 ret = adis16204_self_test(indio_dev);
280 dev_err(&indio_dev->dev, "self test failure");
284 /* Read status register to check the result */
285 ret = adis16204_check_status(indio_dev);
287 adis16204_reset(indio_dev);
288 dev_err(&indio_dev->dev, "device not playing ball -> reset");
289 msleep(ADIS16204_STARTUP_DELAY);
290 ret = adis16204_check_status(indio_dev);
292 dev_err(&indio_dev->dev, "giving up");
301 /* Unique to this driver currently */
302 #define IIO_DEV_ATTR_ACCEL_XY(_show, _addr) \
303 IIO_DEVICE_ATTR(in_accel_xy, S_IRUGO, _show, NULL, _addr)
304 #define IIO_DEV_ATTR_ACCEL_XYPEAK(_show, _addr) \
305 IIO_DEVICE_ATTR(in_accel_xypeak, S_IRUGO, _show, NULL, _addr)
307 static IIO_DEV_ATTR_ACCEL_XY(adis16204_read_14bit_signed,
308 ADIS16204_XY_RSS_OUT);
309 static IIO_DEV_ATTR_ACCEL_XYPEAK(adis16204_read_14bit_signed,
310 ADIS16204_XY_PEAK_OUT);
311 static IIO_CONST_ATTR(in_accel_xy_scale, "0.017125");
313 static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16204_write_reset, 0);
315 enum adis16204_channel {
323 static u8 adis16204_addresses[5][3] = {
324 [in_supply] = { ADIS16204_SUPPLY_OUT },
325 [in_aux] = { ADIS16204_AUX_ADC },
326 [temp] = { ADIS16204_TEMP_OUT },
327 [accel_x] = { ADIS16204_XACCL_OUT, ADIS16204_XACCL_NULL,
328 ADIS16204_X_PEAK_OUT },
329 [accel_y] = { ADIS16204_XACCL_OUT, ADIS16204_YACCL_NULL,
330 ADIS16204_Y_PEAK_OUT },
333 static int adis16204_read_raw(struct iio_dev *indio_dev,
334 struct iio_chan_spec const *chan,
345 case IIO_CHAN_INFO_RAW:
346 mutex_lock(&indio_dev->mlock);
347 addr = adis16204_addresses[chan->address][0];
348 ret = adis16204_spi_read_reg_16(indio_dev, addr, &val16);
350 mutex_unlock(&indio_dev->mlock);
354 if (val16 & ADIS16204_ERROR_ACTIVE) {
355 ret = adis16204_check_status(indio_dev);
357 mutex_unlock(&indio_dev->mlock);
361 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
362 if (chan->scan_type.sign == 's')
363 val16 = (s16)(val16 <<
364 (16 - chan->scan_type.realbits)) >>
365 (16 - chan->scan_type.realbits);
367 mutex_unlock(&indio_dev->mlock);
369 case IIO_CHAN_INFO_SCALE:
370 switch (chan->type) {
373 if (chan->channel == 0)
377 return IIO_VAL_INT_PLUS_MICRO;
381 return IIO_VAL_INT_PLUS_MICRO;
384 if (chan->channel == 'x')
388 return IIO_VAL_INT_PLUS_MICRO;
393 case IIO_CHAN_INFO_OFFSET:
396 case IIO_CHAN_INFO_CALIBBIAS:
397 case IIO_CHAN_INFO_PEAK:
398 if (mask == IIO_CHAN_INFO_CALIBBIAS) {
401 } else { /* PEAK_SEPARATE */
405 mutex_lock(&indio_dev->mlock);
406 addr = adis16204_addresses[chan->address][addrind];
407 ret = adis16204_spi_read_reg_16(indio_dev, addr, &val16);
409 mutex_unlock(&indio_dev->mlock);
412 val16 &= (1 << bits) - 1;
413 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
415 mutex_unlock(&indio_dev->mlock);
421 static int adis16204_write_raw(struct iio_dev *indio_dev,
422 struct iio_chan_spec const *chan,
431 case IIO_CHAN_INFO_CALIBBIAS:
432 switch (chan->type) {
439 val16 = val & ((1 << bits) - 1);
440 addr = adis16204_addresses[chan->address][1];
441 return adis16204_spi_write_reg_16(indio_dev, addr, val16);
446 static struct iio_chan_spec adis16204_channels[] = {
449 .indexed = 1, /* Note was not previously indexed */
451 .extend_name = "supply",
452 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
453 IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
454 .address = in_supply,
455 .scan_index = ADIS16204_SCAN_SUPPLY,
465 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
466 IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
468 .scan_index = ADIS16204_SCAN_AUX_ADC,
478 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
479 IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
480 IIO_CHAN_INFO_OFFSET_SEPARATE_BIT,
482 .scan_index = ADIS16204_SCAN_TEMP,
491 .channel2 = IIO_MOD_X,
492 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
493 IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
494 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
495 IIO_CHAN_INFO_PEAK_SEPARATE_BIT,
497 .scan_index = ADIS16204_SCAN_ACC_X,
506 .channel2 = IIO_MOD_Y,
507 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
508 IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
509 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
510 IIO_CHAN_INFO_PEAK_SEPARATE_BIT,
512 .scan_index = ADIS16204_SCAN_ACC_Y,
519 IIO_CHAN_SOFT_TIMESTAMP(5),
522 static struct attribute *adis16204_attributes[] = {
523 &iio_dev_attr_reset.dev_attr.attr,
524 &iio_dev_attr_in_accel_xy.dev_attr.attr,
525 &iio_dev_attr_in_accel_xypeak.dev_attr.attr,
526 &iio_const_attr_in_accel_xy_scale.dev_attr.attr,
530 static const struct attribute_group adis16204_attribute_group = {
531 .attrs = adis16204_attributes,
534 static const struct iio_info adis16204_info = {
535 .attrs = &adis16204_attribute_group,
536 .read_raw = &adis16204_read_raw,
537 .write_raw = &adis16204_write_raw,
538 .driver_module = THIS_MODULE,
541 static int __devinit adis16204_probe(struct spi_device *spi)
544 struct adis16204_state *st;
545 struct iio_dev *indio_dev;
547 /* setup the industrialio driver allocated elements */
548 indio_dev = iio_device_alloc(sizeof(*st));
549 if (indio_dev == NULL) {
553 st = iio_priv(indio_dev);
554 /* this is only used for removal purposes */
555 spi_set_drvdata(spi, indio_dev);
557 mutex_init(&st->buf_lock);
559 indio_dev->name = spi->dev.driver->name;
560 indio_dev->dev.parent = &spi->dev;
561 indio_dev->info = &adis16204_info;
562 indio_dev->channels = adis16204_channels;
563 indio_dev->num_channels = ARRAY_SIZE(adis16204_channels);
564 indio_dev->modes = INDIO_DIRECT_MODE;
566 ret = adis16204_configure_ring(indio_dev);
570 ret = iio_buffer_register(indio_dev,
572 ARRAY_SIZE(adis16204_channels));
574 printk(KERN_ERR "failed to initialize the ring\n");
575 goto error_unreg_ring_funcs;
579 ret = adis16204_probe_trigger(indio_dev);
581 goto error_uninitialize_ring;
584 /* Get the device into a sane initial state */
585 ret = adis16204_initial_setup(indio_dev);
587 goto error_remove_trigger;
588 ret = iio_device_register(indio_dev);
590 goto error_remove_trigger;
594 error_remove_trigger:
595 adis16204_remove_trigger(indio_dev);
596 error_uninitialize_ring:
597 iio_buffer_unregister(indio_dev);
598 error_unreg_ring_funcs:
599 adis16204_unconfigure_ring(indio_dev);
601 iio_device_free(indio_dev);
606 static int adis16204_remove(struct spi_device *spi)
608 struct iio_dev *indio_dev = spi_get_drvdata(spi);
610 iio_device_unregister(indio_dev);
611 adis16204_remove_trigger(indio_dev);
612 iio_buffer_unregister(indio_dev);
613 adis16204_unconfigure_ring(indio_dev);
614 iio_device_free(indio_dev);
619 static struct spi_driver adis16204_driver = {
622 .owner = THIS_MODULE,
624 .probe = adis16204_probe,
625 .remove = __devexit_p(adis16204_remove),
627 module_spi_driver(adis16204_driver);
629 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
630 MODULE_DESCRIPTION("ADIS16204 High-g Digital Impact Sensor and Recorder");
631 MODULE_LICENSE("GPL v2");
632 MODULE_ALIAS("spi:adis16204");