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>
20 #include <linux/module.h>
24 #include "../buffer_generic.h"
26 #include "adis16204.h"
28 #define DRIVER_NAME "adis16204"
31 * adis16204_spi_write_reg_8() - write single byte to a register
32 * @dev: device associated with child of actual device (iio_dev or iio_trig)
33 * @reg_address: the address of the register to be written
34 * @val: the value to write
36 static int adis16204_spi_write_reg_8(struct iio_dev *indio_dev,
41 struct adis16204_state *st = iio_priv(indio_dev);
43 mutex_lock(&st->buf_lock);
44 st->tx[0] = ADIS16204_WRITE_REG(reg_address);
47 ret = spi_write(st->us, st->tx, 2);
48 mutex_unlock(&st->buf_lock);
54 * adis16204_spi_write_reg_16() - write 2 bytes to a pair of registers
55 * @indio_dev: iio device associated with child of actual device
56 * @reg_address: the address of the lower of the two registers. Second register
57 * is assumed to have address one greater.
58 * @val: value to be written
60 static int adis16204_spi_write_reg_16(struct iio_dev *indio_dev,
65 struct spi_message msg;
66 struct adis16204_state *st = iio_priv(indio_dev);
67 struct spi_transfer xfers[] = {
81 mutex_lock(&st->buf_lock);
82 st->tx[0] = ADIS16204_WRITE_REG(lower_reg_address);
83 st->tx[1] = value & 0xFF;
84 st->tx[2] = ADIS16204_WRITE_REG(lower_reg_address + 1);
85 st->tx[3] = (value >> 8) & 0xFF;
87 spi_message_init(&msg);
88 spi_message_add_tail(&xfers[0], &msg);
89 spi_message_add_tail(&xfers[1], &msg);
90 ret = spi_sync(st->us, &msg);
91 mutex_unlock(&st->buf_lock);
97 * adis16204_spi_read_reg_16() - read 2 bytes from a 16-bit register
98 * @indio_dev: iio device associated with child of actual device
99 * @reg_address: the address of the lower of the two registers. Second register
100 * is assumed to have address one greater.
101 * @val: somewhere to pass back the value read
103 static int adis16204_spi_read_reg_16(struct iio_dev *indio_dev,
104 u8 lower_reg_address,
107 struct spi_message msg;
108 struct adis16204_state *st = iio_priv(indio_dev);
110 struct spi_transfer xfers[] = {
125 mutex_lock(&st->buf_lock);
126 st->tx[0] = ADIS16204_READ_REG(lower_reg_address);
129 spi_message_init(&msg);
130 spi_message_add_tail(&xfers[0], &msg);
131 spi_message_add_tail(&xfers[1], &msg);
132 ret = spi_sync(st->us, &msg);
134 dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
138 *val = (st->rx[0] << 8) | st->rx[1];
141 mutex_unlock(&st->buf_lock);
145 static int adis16204_check_status(struct iio_dev *indio_dev)
150 ret = adis16204_spi_read_reg_16(indio_dev,
151 ADIS16204_DIAG_STAT, &status);
153 dev_err(&indio_dev->dev, "Reading status failed\n");
158 if (status & ADIS16204_DIAG_STAT_SELFTEST_FAIL)
159 dev_err(&indio_dev->dev, "Self test failure\n");
160 if (status & ADIS16204_DIAG_STAT_SPI_FAIL)
161 dev_err(&indio_dev->dev, "SPI failure\n");
162 if (status & ADIS16204_DIAG_STAT_FLASH_UPT)
163 dev_err(&indio_dev->dev, "Flash update failed\n");
164 if (status & ADIS16204_DIAG_STAT_POWER_HIGH)
165 dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
166 if (status & ADIS16204_DIAG_STAT_POWER_LOW)
167 dev_err(&indio_dev->dev, "Power supply below 2.975V\n");
173 static ssize_t adis16204_read_14bit_signed(struct device *dev,
174 struct device_attribute *attr,
177 struct iio_dev *indio_dev = dev_get_drvdata(dev);
178 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
182 mutex_lock(&indio_dev->mlock);
184 ret = adis16204_spi_read_reg_16(indio_dev,
185 this_attr->address, (u16 *)&val);
187 if (val & ADIS16204_ERROR_ACTIVE)
188 adis16204_check_status(indio_dev);
190 val = ((s16)(val << 2) >> 2);
191 ret = sprintf(buf, "%d\n", val);
194 mutex_unlock(&indio_dev->mlock);
199 static int adis16204_reset(struct iio_dev *indio_dev)
202 ret = adis16204_spi_write_reg_8(indio_dev,
204 ADIS16204_GLOB_CMD_SW_RESET);
206 dev_err(&indio_dev->dev, "problem resetting device");
211 static ssize_t adis16204_write_reset(struct device *dev,
212 struct device_attribute *attr,
213 const char *buf, size_t len)
215 struct iio_dev *indio_dev = dev_get_drvdata(dev);
223 return adis16204_reset(indio_dev);
228 int adis16204_set_irq(struct iio_dev *indio_dev, bool enable)
233 ret = adis16204_spi_read_reg_16(indio_dev, ADIS16204_MSC_CTRL, &msc);
237 msc |= ADIS16204_MSC_CTRL_ACTIVE_HIGH;
238 msc &= ~ADIS16204_MSC_CTRL_DATA_RDY_DIO2;
240 msc |= ADIS16204_MSC_CTRL_DATA_RDY_EN;
242 msc &= ~ADIS16204_MSC_CTRL_DATA_RDY_EN;
244 ret = adis16204_spi_write_reg_16(indio_dev, ADIS16204_MSC_CTRL, msc);
250 static int adis16204_self_test(struct iio_dev *indio_dev)
253 ret = adis16204_spi_write_reg_16(indio_dev,
255 ADIS16204_MSC_CTRL_SELF_TEST_EN);
257 dev_err(&indio_dev->dev, "problem starting self test");
261 adis16204_check_status(indio_dev);
267 static int adis16204_initial_setup(struct iio_dev *indio_dev)
272 ret = adis16204_set_irq(indio_dev, false);
274 dev_err(&indio_dev->dev, "disable irq failed");
279 ret = adis16204_self_test(indio_dev);
281 dev_err(&indio_dev->dev, "self test failure");
285 /* Read status register to check the result */
286 ret = adis16204_check_status(indio_dev);
288 adis16204_reset(indio_dev);
289 dev_err(&indio_dev->dev, "device not playing ball -> reset");
290 msleep(ADIS16204_STARTUP_DELAY);
291 ret = adis16204_check_status(indio_dev);
293 dev_err(&indio_dev->dev, "giving up");
302 /* Unique to this driver currently */
303 #define IIO_DEV_ATTR_ACCEL_XY(_show, _addr) \
304 IIO_DEVICE_ATTR(in_accel_xy, S_IRUGO, _show, NULL, _addr)
305 #define IIO_DEV_ATTR_ACCEL_XYPEAK(_show, _addr) \
306 IIO_DEVICE_ATTR(in_accel_xypeak, S_IRUGO, _show, NULL, _addr)
308 static IIO_DEV_ATTR_ACCEL_XY(adis16204_read_14bit_signed,
309 ADIS16204_XY_RSS_OUT);
310 static IIO_DEV_ATTR_ACCEL_XYPEAK(adis16204_read_14bit_signed,
311 ADIS16204_XY_PEAK_OUT);
312 static IIO_CONST_ATTR(in_accel_xy_scale, "0.017125");
314 static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16204_write_reset, 0);
316 enum adis16204_channel {
324 static u8 adis16204_addresses[5][3] = {
325 [in_supply] = { ADIS16204_SUPPLY_OUT },
326 [in_aux] = { ADIS16204_AUX_ADC },
327 [temp] = { ADIS16204_TEMP_OUT },
328 [accel_x] = { ADIS16204_XACCL_OUT, ADIS16204_XACCL_NULL,
329 ADIS16204_X_PEAK_OUT },
330 [accel_y] = { ADIS16204_XACCL_OUT, ADIS16204_YACCL_NULL,
331 ADIS16204_Y_PEAK_OUT },
334 static int adis16204_read_raw(struct iio_dev *indio_dev,
335 struct iio_chan_spec const *chan,
347 mutex_lock(&indio_dev->mlock);
348 addr = adis16204_addresses[chan->address][0];
349 ret = adis16204_spi_read_reg_16(indio_dev, addr, &val16);
351 mutex_unlock(&indio_dev->mlock);
355 if (val16 & ADIS16204_ERROR_ACTIVE) {
356 ret = adis16204_check_status(indio_dev);
358 mutex_unlock(&indio_dev->mlock);
362 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
363 if (chan->scan_type.sign == 's')
364 val16 = (s16)(val16 <<
365 (16 - chan->scan_type.realbits)) >>
366 (16 - chan->scan_type.realbits);
368 mutex_unlock(&indio_dev->mlock);
370 case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
371 switch (chan->type) {
374 if (chan->channel == 0)
378 return IIO_VAL_INT_PLUS_MICRO;
382 return IIO_VAL_INT_PLUS_MICRO;
385 if (chan->channel == 'x')
389 return IIO_VAL_INT_PLUS_MICRO;
394 case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
397 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
398 case (1 << IIO_CHAN_INFO_PEAK_SEPARATE):
399 if (mask == (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE)) {
402 } else { /* PEAK_SEPARATE */
406 mutex_lock(&indio_dev->mlock);
407 addr = adis16204_addresses[chan->address][addrind];
408 ret = adis16204_spi_read_reg_16(indio_dev, addr, &val16);
410 mutex_unlock(&indio_dev->mlock);
413 val16 &= (1 << bits) - 1;
414 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
416 mutex_unlock(&indio_dev->mlock);
422 static int adis16204_write_raw(struct iio_dev *indio_dev,
423 struct iio_chan_spec const *chan,
432 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
433 switch (chan->type) {
440 val16 = val & ((1 << bits) - 1);
441 addr = adis16204_addresses[chan->address][1];
442 return adis16204_spi_write_reg_16(indio_dev, addr, val16);
447 static struct iio_chan_spec adis16204_channels[] = {
448 IIO_CHAN(IIO_IN, 0, 0, 0, "supply", 0, 0,
449 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
450 in_supply, ADIS16204_SCAN_SUPPLY,
451 IIO_ST('u', 12, 16, 0), 0),
452 IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
453 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
454 in_aux, ADIS16204_SCAN_AUX_ADC,
455 IIO_ST('u', 12, 16, 0), 0),
456 IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0,
457 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
458 (1 << IIO_CHAN_INFO_OFFSET_SEPARATE),
459 temp, ADIS16204_SCAN_TEMP,
460 IIO_ST('u', 12, 16, 0), 0),
461 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X,
462 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
463 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE) |
464 (1 << IIO_CHAN_INFO_PEAK_SEPARATE),
465 accel_x, ADIS16204_SCAN_ACC_X,
466 IIO_ST('s', 14, 16, 0), 0),
467 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y,
468 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
469 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE) |
470 (1 << IIO_CHAN_INFO_PEAK_SEPARATE),
471 accel_y, ADIS16204_SCAN_ACC_Y,
472 IIO_ST('s', 14, 16, 0), 0),
473 IIO_CHAN_SOFT_TIMESTAMP(5),
476 static struct attribute *adis16204_attributes[] = {
477 &iio_dev_attr_reset.dev_attr.attr,
478 &iio_dev_attr_in_accel_xy.dev_attr.attr,
479 &iio_dev_attr_in_accel_xypeak.dev_attr.attr,
480 &iio_const_attr_in_accel_xy_scale.dev_attr.attr,
484 static const struct attribute_group adis16204_attribute_group = {
485 .attrs = adis16204_attributes,
488 static const struct iio_info adis16204_info = {
489 .attrs = &adis16204_attribute_group,
490 .read_raw = &adis16204_read_raw,
491 .write_raw = &adis16204_write_raw,
492 .driver_module = THIS_MODULE,
495 static int __devinit adis16204_probe(struct spi_device *spi)
498 struct adis16204_state *st;
499 struct iio_dev *indio_dev;
501 /* setup the industrialio driver allocated elements */
502 indio_dev = iio_allocate_device(sizeof(*st));
503 if (indio_dev == NULL) {
507 st = iio_priv(indio_dev);
508 /* this is only used for removal purposes */
509 spi_set_drvdata(spi, indio_dev);
511 mutex_init(&st->buf_lock);
513 indio_dev->name = spi->dev.driver->name;
514 indio_dev->dev.parent = &spi->dev;
515 indio_dev->info = &adis16204_info;
516 indio_dev->channels = adis16204_channels;
517 indio_dev->num_channels = ARRAY_SIZE(adis16204_channels);
518 indio_dev->modes = INDIO_DIRECT_MODE;
520 ret = adis16204_configure_ring(indio_dev);
524 ret = iio_buffer_register(indio_dev,
526 ARRAY_SIZE(adis16204_channels));
528 printk(KERN_ERR "failed to initialize the ring\n");
529 goto error_unreg_ring_funcs;
533 ret = adis16204_probe_trigger(indio_dev);
535 goto error_uninitialize_ring;
538 /* Get the device into a sane initial state */
539 ret = adis16204_initial_setup(indio_dev);
541 goto error_remove_trigger;
542 ret = iio_device_register(indio_dev);
544 goto error_remove_trigger;
548 error_remove_trigger:
549 adis16204_remove_trigger(indio_dev);
550 error_uninitialize_ring:
551 iio_buffer_unregister(indio_dev);
552 error_unreg_ring_funcs:
553 adis16204_unconfigure_ring(indio_dev);
555 iio_free_device(indio_dev);
560 static int adis16204_remove(struct spi_device *spi)
562 struct iio_dev *indio_dev = spi_get_drvdata(spi);
564 adis16204_remove_trigger(indio_dev);
565 iio_buffer_unregister(indio_dev);
566 adis16204_unconfigure_ring(indio_dev);
567 iio_device_unregister(indio_dev);
572 static struct spi_driver adis16204_driver = {
575 .owner = THIS_MODULE,
577 .probe = adis16204_probe,
578 .remove = __devexit_p(adis16204_remove),
581 static __init int adis16204_init(void)
583 return spi_register_driver(&adis16204_driver);
585 module_init(adis16204_init);
587 static __exit void adis16204_exit(void)
589 spi_unregister_driver(&adis16204_driver);
591 module_exit(adis16204_exit);
593 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
594 MODULE_DESCRIPTION("ADIS16204 High-g Digital Impact Sensor and Recorder");
595 MODULE_LICENSE("GPL v2");