2 * ADIS16220 Programmable Digital Vibration Sensor driver
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>
24 #include "../adc/adc.h"
26 #include "adis16220.h"
28 #define DRIVER_NAME "adis16220"
31 * adis16220_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 adis16220_spi_write_reg_8(struct device *dev,
41 struct iio_dev *indio_dev = dev_get_drvdata(dev);
42 struct adis16220_state *st = iio_dev_get_devdata(indio_dev);
44 mutex_lock(&st->buf_lock);
45 st->tx[0] = ADIS16220_WRITE_REG(reg_address);
48 ret = spi_write(st->us, st->tx, 2);
49 mutex_unlock(&st->buf_lock);
55 * adis16220_spi_write_reg_16() - write 2 bytes to a pair of registers
56 * @dev: device associated with child of actual device (iio_dev or iio_trig)
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 adis16220_spi_write_reg_16(struct device *dev,
66 struct spi_message msg;
67 struct iio_dev *indio_dev = dev_get_drvdata(dev);
68 struct adis16220_state *st = iio_dev_get_devdata(indio_dev);
69 struct spi_transfer xfers[] = {
85 mutex_lock(&st->buf_lock);
86 st->tx[0] = ADIS16220_WRITE_REG(lower_reg_address);
87 st->tx[1] = value & 0xFF;
88 st->tx[2] = ADIS16220_WRITE_REG(lower_reg_address + 1);
89 st->tx[3] = (value >> 8) & 0xFF;
91 spi_message_init(&msg);
92 spi_message_add_tail(&xfers[0], &msg);
93 spi_message_add_tail(&xfers[1], &msg);
94 ret = spi_sync(st->us, &msg);
95 mutex_unlock(&st->buf_lock);
101 * adis16220_spi_read_reg_16() - read 2 bytes from a 16-bit register
102 * @dev: device associated with child of actual device (iio_dev or iio_trig)
103 * @reg_address: the address of the lower of the two registers. Second register
104 * is assumed to have address one greater.
105 * @val: somewhere to pass back the value read
107 static int adis16220_spi_read_reg_16(struct device *dev,
108 u8 lower_reg_address,
111 struct spi_message msg;
112 struct iio_dev *indio_dev = dev_get_drvdata(dev);
113 struct adis16220_state *st = iio_dev_get_devdata(indio_dev);
115 struct spi_transfer xfers[] = {
131 mutex_lock(&st->buf_lock);
132 st->tx[0] = ADIS16220_READ_REG(lower_reg_address);
135 spi_message_init(&msg);
136 spi_message_add_tail(&xfers[0], &msg);
137 spi_message_add_tail(&xfers[1], &msg);
138 ret = spi_sync(st->us, &msg);
140 dev_err(&st->us->dev,
141 "problem when reading 16 bit register 0x%02X",
145 *val = (st->rx[0] << 8) | st->rx[1];
148 mutex_unlock(&st->buf_lock);
152 static ssize_t adis16220_spi_read_signed(struct device *dev,
153 struct device_attribute *attr,
159 unsigned shift = 16 - bits;
160 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
162 ret = adis16220_spi_read_reg_16(dev, this_attr->address, (u16 *)&val);
166 val = ((s16)(val << shift) >> shift);
167 return sprintf(buf, "%d\n", val);
170 static ssize_t adis16220_read_12bit_unsigned(struct device *dev,
171 struct device_attribute *attr,
176 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
178 ret = adis16220_spi_read_reg_16(dev, this_attr->address, &val);
182 return sprintf(buf, "%u\n", val & 0x0FFF);
185 static ssize_t adis16220_read_16bit(struct device *dev,
186 struct device_attribute *attr,
189 struct iio_dev *indio_dev = dev_get_drvdata(dev);
192 /* Take the iio_dev status lock */
193 mutex_lock(&indio_dev->mlock);
194 ret = adis16220_spi_read_signed(dev, attr, buf, 16);
195 mutex_unlock(&indio_dev->mlock);
200 static ssize_t adis16220_write_16bit(struct device *dev,
201 struct device_attribute *attr,
205 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
209 ret = strict_strtol(buf, 10, &val);
212 ret = adis16220_spi_write_reg_16(dev, this_attr->address, val);
215 return ret ? ret : len;
218 static int adis16220_capture(struct device *dev)
221 ret = adis16220_spi_write_reg_16(dev,
223 0xBF08); /* initiates a manual data capture */
225 dev_err(dev, "problem beginning capture");
227 msleep(10); /* delay for capture to finish */
232 static int adis16220_reset(struct device *dev)
235 ret = adis16220_spi_write_reg_8(dev,
237 ADIS16220_GLOB_CMD_SW_RESET);
239 dev_err(dev, "problem resetting device");
244 static ssize_t adis16220_write_reset(struct device *dev,
245 struct device_attribute *attr,
246 const char *buf, size_t len)
254 return adis16220_reset(dev) == 0 ? len : -EIO;
259 static ssize_t adis16220_write_capture(struct device *dev,
260 struct device_attribute *attr,
261 const char *buf, size_t len)
269 return adis16220_capture(dev) == 0 ? len : -EIO;
274 static int adis16220_check_status(struct device *dev)
279 ret = adis16220_spi_read_reg_16(dev, ADIS16220_DIAG_STAT, &status);
282 dev_err(dev, "Reading status failed\n");
287 if (status & ADIS16220_DIAG_STAT_VIOLATION)
288 dev_err(dev, "Capture period violation/interruption\n");
289 if (status & ADIS16220_DIAG_STAT_SPI_FAIL)
290 dev_err(dev, "SPI failure\n");
291 if (status & ADIS16220_DIAG_STAT_FLASH_UPT)
292 dev_err(dev, "Flash update failed\n");
293 if (status & ADIS16220_DIAG_STAT_POWER_HIGH)
294 dev_err(dev, "Power supply above 3.625V\n");
295 if (status & ADIS16220_DIAG_STAT_POWER_LOW)
296 dev_err(dev, "Power supply below 3.15V\n");
302 static int adis16220_self_test(struct device *dev)
305 ret = adis16220_spi_write_reg_16(dev,
307 ADIS16220_MSC_CTRL_SELF_TEST_EN);
309 dev_err(dev, "problem starting self test");
313 adis16220_check_status(dev);
319 static int adis16220_initial_setup(struct adis16220_state *st)
322 struct device *dev = &st->indio_dev->dev;
325 ret = adis16220_self_test(dev);
327 dev_err(dev, "self test failure");
331 /* Read status register to check the result */
332 ret = adis16220_check_status(dev);
334 adis16220_reset(dev);
335 dev_err(dev, "device not playing ball -> reset");
336 msleep(ADIS16220_STARTUP_DELAY);
337 ret = adis16220_check_status(dev);
339 dev_err(dev, "giving up");
344 printk(KERN_INFO DRIVER_NAME ": at CS%d (irq %d)\n",
345 st->us->chip_select, st->us->irq);
351 static ssize_t adis16220_capture_buffer_read(struct adis16220_state *st,
357 struct spi_message msg;
358 struct spi_transfer xfers[] = {
376 if (unlikely(!count))
379 if ((off >= ADIS16220_CAPTURE_SIZE) || (count & 1) || (off & 1))
382 if (off + count > ADIS16220_CAPTURE_SIZE)
383 count = ADIS16220_CAPTURE_SIZE - off;
385 /* write the begin position of capture buffer */
386 ret = adis16220_spi_write_reg_16(&st->indio_dev->dev,
392 /* read count/2 values from capture buffer */
393 mutex_lock(&st->buf_lock);
395 for (i = 0; i < count; i += 2) {
396 st->tx[i] = ADIS16220_READ_REG(addr);
399 xfers[1].len = count;
401 spi_message_init(&msg);
402 spi_message_add_tail(&xfers[0], &msg);
403 spi_message_add_tail(&xfers[1], &msg);
404 ret = spi_sync(st->us, &msg);
407 mutex_unlock(&st->buf_lock);
411 memcpy(buf, st->rx, count);
413 mutex_unlock(&st->buf_lock);
417 static ssize_t adis16220_accel_bin_read(struct file *filp, struct kobject *kobj,
418 struct bin_attribute *attr,
423 struct device *dev = container_of(kobj, struct device, kobj);
424 struct iio_dev *indio_dev = dev_get_drvdata(dev);
425 struct adis16220_state *st = iio_dev_get_devdata(indio_dev);
427 return adis16220_capture_buffer_read(st, buf,
429 ADIS16220_CAPT_BUFA);
432 static struct bin_attribute accel_bin = {
437 .read = adis16220_accel_bin_read,
438 .size = ADIS16220_CAPTURE_SIZE,
441 static ssize_t adis16220_adc1_bin_read(struct file *filp, struct kobject *kobj,
442 struct bin_attribute *attr,
443 char *buf, loff_t off,
446 struct device *dev = container_of(kobj, struct device, kobj);
447 struct iio_dev *indio_dev = dev_get_drvdata(dev);
448 struct adis16220_state *st = iio_dev_get_devdata(indio_dev);
450 return adis16220_capture_buffer_read(st, buf,
452 ADIS16220_CAPT_BUF1);
455 static struct bin_attribute adc1_bin = {
460 .read = adis16220_adc1_bin_read,
461 .size = ADIS16220_CAPTURE_SIZE,
464 static ssize_t adis16220_adc2_bin_read(struct file *filp, struct kobject *kobj,
465 struct bin_attribute *attr,
466 char *buf, loff_t off,
469 struct device *dev = container_of(kobj, struct device, kobj);
470 struct iio_dev *indio_dev = dev_get_drvdata(dev);
471 struct adis16220_state *st = iio_dev_get_devdata(indio_dev);
473 return adis16220_capture_buffer_read(st, buf,
475 ADIS16220_CAPT_BUF2);
479 static struct bin_attribute adc2_bin = {
484 .read = adis16220_adc2_bin_read,
485 .size = ADIS16220_CAPTURE_SIZE,
488 static IIO_DEV_ATTR_IN_NAMED_RAW(0, supply, adis16220_read_12bit_unsigned,
489 ADIS16220_CAPT_SUPPLY);
490 static IIO_CONST_ATTR_IN_NAMED_SCALE(0, supply, "0.0012207");
491 static IIO_DEV_ATTR_ACCEL(adis16220_read_16bit, ADIS16220_CAPT_BUFA);
492 static IIO_DEVICE_ATTR(accel_peak_raw, S_IRUGO, adis16220_read_16bit,
493 NULL, ADIS16220_CAPT_PEAKA);
494 static IIO_DEV_ATTR_ACCEL_OFFSET(S_IWUSR | S_IRUGO,
495 adis16220_read_16bit,
496 adis16220_write_16bit,
497 ADIS16220_ACCL_NULL);
498 static IIO_CONST_ATTR_ACCEL_SCALE("0.18704223545");
499 static IIO_DEV_ATTR_TEMP_RAW(adis16220_read_12bit_unsigned);
500 static IIO_CONST_ATTR_TEMP_OFFSET("25");
501 static IIO_CONST_ATTR_TEMP_SCALE("-0.47");
503 static IIO_DEV_ATTR_IN_RAW(1, adis16220_read_16bit, ADIS16220_CAPT_BUF1);
504 static IIO_DEV_ATTR_IN_RAW(2, adis16220_read_16bit, ADIS16220_CAPT_BUF2);
506 static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL,
507 adis16220_write_reset, 0);
509 #define IIO_DEV_ATTR_CAPTURE(_store) \
510 IIO_DEVICE_ATTR(capture, S_IWUGO, NULL, _store, 0)
512 static IIO_DEV_ATTR_CAPTURE(adis16220_write_capture);
514 #define IIO_DEV_ATTR_CAPTURE_COUNT(_mode, _show, _store, _addr) \
515 IIO_DEVICE_ATTR(capture_count, _mode, _show, _store, _addr)
517 static IIO_DEV_ATTR_CAPTURE_COUNT(S_IWUSR | S_IRUGO,
518 adis16220_read_16bit,
519 adis16220_write_16bit,
520 ADIS16220_CAPT_PNTR);
522 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("100200");
524 static IIO_CONST_ATTR_NAME("adis16220");
526 static struct attribute *adis16220_attributes[] = {
527 &iio_dev_attr_in0_supply_raw.dev_attr.attr,
528 &iio_const_attr_in0_supply_scale.dev_attr.attr,
529 &iio_dev_attr_accel_raw.dev_attr.attr,
530 &iio_dev_attr_accel_offset.dev_attr.attr,
531 &iio_dev_attr_accel_peak_raw.dev_attr.attr,
532 &iio_const_attr_accel_scale.dev_attr.attr,
533 &iio_dev_attr_temp_raw.dev_attr.attr,
534 &iio_dev_attr_in1_raw.dev_attr.attr,
535 &iio_dev_attr_in2_raw.dev_attr.attr,
536 &iio_const_attr_temp_offset.dev_attr.attr,
537 &iio_const_attr_temp_scale.dev_attr.attr,
538 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
539 &iio_dev_attr_reset.dev_attr.attr,
540 &iio_dev_attr_capture.dev_attr.attr,
541 &iio_dev_attr_capture_count.dev_attr.attr,
542 &iio_const_attr_name.dev_attr.attr,
546 static const struct attribute_group adis16220_attribute_group = {
547 .attrs = adis16220_attributes,
550 static int __devinit adis16220_probe(struct spi_device *spi)
552 int ret, regdone = 0;
553 struct adis16220_state *st = kzalloc(sizeof *st, GFP_KERNEL);
558 /* this is only used for removal purposes */
559 spi_set_drvdata(spi, st);
561 /* Allocate the comms buffers */
562 st->rx = kzalloc(sizeof(*st->rx)*ADIS16220_MAX_RX, GFP_KERNEL);
563 if (st->rx == NULL) {
567 st->tx = kzalloc(sizeof(*st->tx)*ADIS16220_MAX_TX, GFP_KERNEL);
568 if (st->tx == NULL) {
573 mutex_init(&st->buf_lock);
574 /* setup the industrialio driver allocated elements */
575 st->indio_dev = iio_allocate_device();
576 if (st->indio_dev == NULL) {
581 st->indio_dev->dev.parent = &spi->dev;
582 st->indio_dev->attrs = &adis16220_attribute_group;
583 st->indio_dev->dev_data = (void *)(st);
584 st->indio_dev->driver_module = THIS_MODULE;
585 st->indio_dev->modes = INDIO_DIRECT_MODE;
587 ret = iio_device_register(st->indio_dev);
592 ret = sysfs_create_bin_file(&st->indio_dev->dev.kobj, &accel_bin);
596 ret = sysfs_create_bin_file(&st->indio_dev->dev.kobj, &adc1_bin);
598 goto error_rm_accel_bin;
600 ret = sysfs_create_bin_file(&st->indio_dev->dev.kobj, &adc2_bin);
602 goto error_rm_adc1_bin;
604 /* Get the device into a sane initial state */
605 ret = adis16220_initial_setup(st);
607 goto error_rm_adc2_bin;
611 sysfs_remove_bin_file(&st->indio_dev->dev.kobj, &adc2_bin);
613 sysfs_remove_bin_file(&st->indio_dev->dev.kobj, &adc1_bin);
615 sysfs_remove_bin_file(&st->indio_dev->dev.kobj, &accel_bin);
618 iio_device_unregister(st->indio_dev);
620 iio_free_device(st->indio_dev);
631 static int adis16220_remove(struct spi_device *spi)
633 struct adis16220_state *st = spi_get_drvdata(spi);
634 struct iio_dev *indio_dev = st->indio_dev;
636 flush_scheduled_work();
638 sysfs_remove_bin_file(&st->indio_dev->dev.kobj, &adc2_bin);
639 sysfs_remove_bin_file(&st->indio_dev->dev.kobj, &adc1_bin);
640 sysfs_remove_bin_file(&st->indio_dev->dev.kobj, &accel_bin);
641 iio_device_unregister(indio_dev);
649 static struct spi_driver adis16220_driver = {
652 .owner = THIS_MODULE,
654 .probe = adis16220_probe,
655 .remove = __devexit_p(adis16220_remove),
658 static __init int adis16220_init(void)
660 return spi_register_driver(&adis16220_driver);
662 module_init(adis16220_init);
664 static __exit void adis16220_exit(void)
666 spi_unregister_driver(&adis16220_driver);
668 module_exit(adis16220_exit);
670 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
671 MODULE_DESCRIPTION("Analog Devices ADIS16220 Digital Vibration Sensor");
672 MODULE_LICENSE("GPL v2");