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/gpio.h>
12 #include <linux/delay.h>
13 #include <linux/mutex.h>
14 #include <linux/device.h>
15 #include <linux/kernel.h>
16 #include <linux/spi/spi.h>
17 #include <linux/slab.h>
18 #include <linux/sysfs.h>
19 #include <linux/list.h>
23 #include "../ring_generic.h"
25 #include "../adc/adc.h"
27 #include "adis16204.h"
29 #define DRIVER_NAME "adis16204"
32 * adis16204_spi_write_reg_8() - write single byte to a register
33 * @dev: device associated with child of actual device (iio_dev or iio_trig)
34 * @reg_address: the address of the register to be written
35 * @val: the value to write
37 static int adis16204_spi_write_reg_8(struct iio_dev *indio_dev,
42 struct adis16204_state *st = iio_priv(indio_dev);
44 mutex_lock(&st->buf_lock);
45 st->tx[0] = ADIS16204_WRITE_REG(reg_address);
48 ret = spi_write(st->us, st->tx, 2);
49 mutex_unlock(&st->buf_lock);
55 * adis16204_spi_write_reg_16() - write 2 bytes to a pair of registers
56 * @indio_dev: iio device associated with child of actual device
57 * @reg_address: the address of the lower of the two registers. Second register
58 * is assumed to have address one greater.
59 * @val: value to be written
61 static int adis16204_spi_write_reg_16(struct iio_dev *indio_dev,
66 struct spi_message msg;
67 struct adis16204_state *st = iio_priv(indio_dev);
68 struct spi_transfer xfers[] = {
82 mutex_lock(&st->buf_lock);
83 st->tx[0] = ADIS16204_WRITE_REG(lower_reg_address);
84 st->tx[1] = value & 0xFF;
85 st->tx[2] = ADIS16204_WRITE_REG(lower_reg_address + 1);
86 st->tx[3] = (value >> 8) & 0xFF;
88 spi_message_init(&msg);
89 spi_message_add_tail(&xfers[0], &msg);
90 spi_message_add_tail(&xfers[1], &msg);
91 ret = spi_sync(st->us, &msg);
92 mutex_unlock(&st->buf_lock);
98 * adis16204_spi_read_reg_16() - read 2 bytes from a 16-bit register
99 * @indio_dev: iio device associated with child of actual device
100 * @reg_address: the address of the lower of the two registers. Second register
101 * is assumed to have address one greater.
102 * @val: somewhere to pass back the value read
104 static int adis16204_spi_read_reg_16(struct iio_dev *indio_dev,
105 u8 lower_reg_address,
108 struct spi_message msg;
109 struct adis16204_state *st = iio_priv(indio_dev);
111 struct spi_transfer xfers[] = {
126 mutex_lock(&st->buf_lock);
127 st->tx[0] = ADIS16204_READ_REG(lower_reg_address);
130 spi_message_init(&msg);
131 spi_message_add_tail(&xfers[0], &msg);
132 spi_message_add_tail(&xfers[1], &msg);
133 ret = spi_sync(st->us, &msg);
135 dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
139 *val = (st->rx[0] << 8) | st->rx[1];
142 mutex_unlock(&st->buf_lock);
146 static int adis16204_check_status(struct iio_dev *indio_dev)
151 ret = adis16204_spi_read_reg_16(indio_dev,
152 ADIS16204_DIAG_STAT, &status);
154 dev_err(&indio_dev->dev, "Reading status failed\n");
159 if (status & ADIS16204_DIAG_STAT_SELFTEST_FAIL)
160 dev_err(&indio_dev->dev, "Self test failure\n");
161 if (status & ADIS16204_DIAG_STAT_SPI_FAIL)
162 dev_err(&indio_dev->dev, "SPI failure\n");
163 if (status & ADIS16204_DIAG_STAT_FLASH_UPT)
164 dev_err(&indio_dev->dev, "Flash update failed\n");
165 if (status & ADIS16204_DIAG_STAT_POWER_HIGH)
166 dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
167 if (status & ADIS16204_DIAG_STAT_POWER_LOW)
168 dev_err(&indio_dev->dev, "Power supply below 2.975V\n");
174 static ssize_t adis16204_read_14bit_signed(struct device *dev,
175 struct device_attribute *attr,
178 struct iio_dev *indio_dev = dev_get_drvdata(dev);
179 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
183 mutex_lock(&indio_dev->mlock);
185 ret = adis16204_spi_read_reg_16(indio_dev,
186 this_attr->address, (u16 *)&val);
188 if (val & ADIS16204_ERROR_ACTIVE)
189 adis16204_check_status(indio_dev);
191 val = ((s16)(val << 2) >> 2);
192 ret = sprintf(buf, "%d\n", val);
195 mutex_unlock(&indio_dev->mlock);
200 static int adis16204_reset(struct iio_dev *indio_dev)
203 ret = adis16204_spi_write_reg_8(indio_dev,
205 ADIS16204_GLOB_CMD_SW_RESET);
207 dev_err(&indio_dev->dev, "problem resetting device");
212 static ssize_t adis16204_write_reset(struct device *dev,
213 struct device_attribute *attr,
214 const char *buf, size_t len)
216 struct iio_dev *indio_dev = dev_get_drvdata(dev);
224 return adis16204_reset(indio_dev);
229 int adis16204_set_irq(struct iio_dev *indio_dev, bool enable)
234 ret = adis16204_spi_read_reg_16(indio_dev, ADIS16204_MSC_CTRL, &msc);
238 msc |= ADIS16204_MSC_CTRL_ACTIVE_HIGH;
239 msc &= ~ADIS16204_MSC_CTRL_DATA_RDY_DIO2;
241 msc |= ADIS16204_MSC_CTRL_DATA_RDY_EN;
243 msc &= ~ADIS16204_MSC_CTRL_DATA_RDY_EN;
245 ret = adis16204_spi_write_reg_16(indio_dev, ADIS16204_MSC_CTRL, msc);
251 static int adis16204_self_test(struct iio_dev *indio_dev)
254 ret = adis16204_spi_write_reg_16(indio_dev,
256 ADIS16204_MSC_CTRL_SELF_TEST_EN);
258 dev_err(&indio_dev->dev, "problem starting self test");
262 adis16204_check_status(indio_dev);
268 static int adis16204_initial_setup(struct iio_dev *indio_dev)
273 ret = adis16204_set_irq(indio_dev, false);
275 dev_err(&indio_dev->dev, "disable irq failed");
280 ret = adis16204_self_test(indio_dev);
282 dev_err(&indio_dev->dev, "self test failure");
286 /* Read status register to check the result */
287 ret = adis16204_check_status(indio_dev);
289 adis16204_reset(indio_dev);
290 dev_err(&indio_dev->dev, "device not playing ball -> reset");
291 msleep(ADIS16204_STARTUP_DELAY);
292 ret = adis16204_check_status(indio_dev);
294 dev_err(&indio_dev->dev, "giving up");
302 static IIO_DEV_ATTR_ACCEL_XY(adis16204_read_14bit_signed,
303 ADIS16204_XY_RSS_OUT);
304 static IIO_DEV_ATTR_ACCEL_XPEAK(adis16204_read_14bit_signed,
305 ADIS16204_X_PEAK_OUT);
306 static IIO_DEV_ATTR_ACCEL_YPEAK(adis16204_read_14bit_signed,
307 ADIS16204_Y_PEAK_OUT);
308 static IIO_DEV_ATTR_ACCEL_XYPEAK(adis16204_read_14bit_signed,
309 ADIS16204_XY_PEAK_OUT);
310 static IIO_CONST_ATTR(accel_xy_scale, "0.017125");
312 static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16204_write_reset, 0);
314 enum adis16204_channel {
322 static u8 adis16204_addresses[5][2] = {
323 [in_supply] = { ADIS16204_SUPPLY_OUT },
324 [in_aux] = { ADIS16204_AUX_ADC },
325 [temp] = { ADIS16204_TEMP_OUT },
326 [accel_x] = { ADIS16204_XACCL_OUT, ADIS16204_XACCL_NULL },
327 [accel_y] = { ADIS16204_XACCL_OUT, ADIS16204_YACCL_NULL },
329 static int adis16204_read_raw(struct iio_dev *indio_dev,
330 struct iio_chan_spec const *chan,
341 mutex_lock(&indio_dev->mlock);
342 addr = adis16204_addresses[chan->address][0];
343 ret = adis16204_spi_read_reg_16(indio_dev, addr, &val16);
345 mutex_unlock(&indio_dev->mlock);
349 if (val16 & ADIS16204_ERROR_ACTIVE) {
350 ret = adis16204_check_status(indio_dev);
352 mutex_unlock(&indio_dev->mlock);
356 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
357 if (chan->scan_type.sign == 's')
358 val16 = (s16)(val16 <<
359 (16 - chan->scan_type.realbits)) >>
360 (16 - chan->scan_type.realbits);
362 mutex_unlock(&indio_dev->mlock);
364 case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
365 switch (chan->type) {
368 if (chan->channel == 0)
372 return IIO_VAL_INT_PLUS_MICRO;
376 return IIO_VAL_INT_PLUS_MICRO;
379 if (chan->channel == 'x')
383 return IIO_VAL_INT_PLUS_MICRO;
388 case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
391 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
392 switch (chan->type) {
399 mutex_lock(&indio_dev->mlock);
400 addr = adis16204_addresses[chan->address][1];
401 ret = adis16204_spi_read_reg_16(indio_dev, addr, &val16);
403 mutex_unlock(&indio_dev->mlock);
406 val16 &= (1 << bits) - 1;
407 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
409 mutex_unlock(&indio_dev->mlock);
415 static int adis16204_write_raw(struct iio_dev *indio_dev,
416 struct iio_chan_spec const *chan,
425 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
426 switch (chan->type) {
433 val16 = val & ((1 << bits) - 1);
434 addr = adis16204_addresses[chan->address][1];
435 return adis16204_spi_write_reg_16(indio_dev, addr, val16);
440 static struct iio_chan_spec adis16204_channels[] = {
441 IIO_CHAN(IIO_IN, 0, 0, 0, "supply", 0, 0,
442 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
443 in_supply, ADIS16204_SCAN_SUPPLY,
444 IIO_ST('u', 12, 16, 0), 0),
445 IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
446 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
447 in_aux, ADIS16204_SCAN_AUX_ADC,
448 IIO_ST('u', 12, 16, 0), 0),
449 IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0,
450 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
451 (1 << IIO_CHAN_INFO_OFFSET_SEPARATE),
452 temp, ADIS16204_SCAN_TEMP,
453 IIO_ST('u', 12, 16, 0), 0),
454 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X,
455 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
456 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
457 accel_x, ADIS16204_SCAN_ACC_X,
458 IIO_ST('s', 14, 16, 0), 0),
459 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y,
460 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
461 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
462 accel_y, ADIS16204_SCAN_ACC_Y,
463 IIO_ST('s', 14, 16, 0), 0),
464 IIO_CHAN_SOFT_TIMESTAMP(5),
466 static struct attribute *adis16204_attributes[] = {
467 &iio_dev_attr_reset.dev_attr.attr,
468 &iio_dev_attr_accel_xy.dev_attr.attr,
469 &iio_dev_attr_accel_xpeak.dev_attr.attr,
470 &iio_dev_attr_accel_ypeak.dev_attr.attr,
471 &iio_dev_attr_accel_xypeak.dev_attr.attr,
472 &iio_const_attr_accel_xy_scale.dev_attr.attr,
476 static const struct attribute_group adis16204_attribute_group = {
477 .attrs = adis16204_attributes,
480 static const struct iio_info adis16204_info = {
481 .attrs = &adis16204_attribute_group,
482 .read_raw = &adis16204_read_raw,
483 .write_raw = &adis16204_write_raw,
484 .driver_module = THIS_MODULE,
487 static int __devinit adis16204_probe(struct spi_device *spi)
489 int ret, regdone = 0;
490 struct adis16204_state *st;
491 struct iio_dev *indio_dev;
493 /* setup the industrialio driver allocated elements */
494 indio_dev = iio_allocate_device(sizeof(*st));
495 if (indio_dev == NULL) {
499 st = iio_priv(indio_dev);
500 /* this is only used for removal purposes */
501 spi_set_drvdata(spi, indio_dev);
503 mutex_init(&st->buf_lock);
505 indio_dev->name = spi->dev.driver->name;
506 indio_dev->dev.parent = &spi->dev;
507 indio_dev->info = &adis16204_info;
508 indio_dev->channels = adis16204_channels;
509 indio_dev->num_channels = ARRAY_SIZE(adis16204_channels);
510 indio_dev->modes = INDIO_DIRECT_MODE;
512 ret = adis16204_configure_ring(indio_dev);
516 ret = iio_device_register(indio_dev);
518 goto error_unreg_ring_funcs;
521 ret = iio_ring_buffer_register_ex(indio_dev->ring, 0,
523 ARRAY_SIZE(adis16204_channels));
525 printk(KERN_ERR "failed to initialize the ring\n");
526 goto error_unreg_ring_funcs;
530 ret = adis16204_probe_trigger(indio_dev);
532 goto error_uninitialize_ring;
535 /* Get the device into a sane initial state */
536 ret = adis16204_initial_setup(indio_dev);
538 goto error_remove_trigger;
541 error_remove_trigger:
542 adis16204_remove_trigger(indio_dev);
543 error_uninitialize_ring:
544 iio_ring_buffer_unregister(indio_dev->ring);
545 error_unreg_ring_funcs:
546 adis16204_unconfigure_ring(indio_dev);
549 iio_device_unregister(indio_dev);
551 iio_free_device(indio_dev);
556 static int adis16204_remove(struct spi_device *spi)
558 struct iio_dev *indio_dev = spi_get_drvdata(spi);
560 adis16204_remove_trigger(indio_dev);
561 iio_ring_buffer_unregister(indio_dev->ring);
562 iio_device_unregister(indio_dev);
563 adis16204_unconfigure_ring(indio_dev);
568 static struct spi_driver adis16204_driver = {
571 .owner = THIS_MODULE,
573 .probe = adis16204_probe,
574 .remove = __devexit_p(adis16204_remove),
577 static __init int adis16204_init(void)
579 return spi_register_driver(&adis16204_driver);
581 module_init(adis16204_init);
583 static __exit void adis16204_exit(void)
585 spi_unregister_driver(&adis16204_driver);
587 module_exit(adis16204_exit);
589 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
590 MODULE_DESCRIPTION("ADIS16204 High-g Digital Impact Sensor and Recorder");
591 MODULE_LICENSE("GPL v2");