2 * ADIS16240 Programmable Impact Sensor and Recorder 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>
20 #include <linux/module.h>
22 #include <linux/iio/iio.h>
23 #include <linux/iio/sysfs.h>
24 #include <linux/iio/buffer.h>
26 #include "adis16240.h"
28 static int adis16240_check_status(struct iio_dev *indio_dev);
31 * adis16240_spi_write_reg_8() - write single byte to a register
32 * @indio_dev: iio_dev associated with device
33 * @reg_address: the address of the register to be written
34 * @val: the value to write
36 static int adis16240_spi_write_reg_8(struct iio_dev *indio_dev,
41 struct adis16240_state *st = iio_priv(indio_dev);
43 mutex_lock(&st->buf_lock);
44 st->tx[0] = ADIS16240_WRITE_REG(reg_address);
47 ret = spi_write(st->us, st->tx, 2);
48 mutex_unlock(&st->buf_lock);
54 * adis16240_spi_write_reg_16() - write 2 bytes to a pair of registers
55 * @indio_dev: iio_dev for this 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 adis16240_spi_write_reg_16(struct iio_dev *indio_dev,
65 struct spi_message msg;
66 struct adis16240_state *st = iio_priv(indio_dev);
67 struct spi_transfer xfers[] = {
82 mutex_lock(&st->buf_lock);
83 st->tx[0] = ADIS16240_WRITE_REG(lower_reg_address);
84 st->tx[1] = value & 0xFF;
85 st->tx[2] = ADIS16240_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 * adis16240_spi_read_reg_16() - read 2 bytes from a 16-bit register
99 * @indio_dev: iio_dev for this 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 adis16240_spi_read_reg_16(struct iio_dev *indio_dev,
105 u8 lower_reg_address,
108 struct spi_message msg;
109 struct adis16240_state *st = iio_priv(indio_dev);
111 struct spi_transfer xfers[] = {
127 mutex_lock(&st->buf_lock);
128 st->tx[0] = ADIS16240_READ_REG(lower_reg_address);
133 spi_message_init(&msg);
134 spi_message_add_tail(&xfers[0], &msg);
135 spi_message_add_tail(&xfers[1], &msg);
136 ret = spi_sync(st->us, &msg);
138 dev_err(&st->us->dev,
139 "problem when reading 16 bit register 0x%02X",
143 *val = (st->rx[0] << 8) | st->rx[1];
146 mutex_unlock(&st->buf_lock);
150 static ssize_t adis16240_spi_read_signed(struct device *dev,
151 struct device_attribute *attr,
155 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
158 unsigned shift = 16 - bits;
159 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
161 ret = adis16240_spi_read_reg_16(indio_dev,
162 this_attr->address, (u16 *)&val);
166 if (val & ADIS16240_ERROR_ACTIVE)
167 adis16240_check_status(indio_dev);
169 val = ((s16)(val << shift) >> shift);
170 return sprintf(buf, "%d\n", val);
173 static ssize_t adis16240_read_12bit_signed(struct device *dev,
174 struct device_attribute *attr,
178 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
180 /* Take the iio_dev status lock */
181 mutex_lock(&indio_dev->mlock);
182 ret = adis16240_spi_read_signed(dev, attr, buf, 12);
183 mutex_unlock(&indio_dev->mlock);
188 static int adis16240_reset(struct iio_dev *indio_dev)
191 ret = adis16240_spi_write_reg_8(indio_dev,
193 ADIS16240_GLOB_CMD_SW_RESET);
195 dev_err(&indio_dev->dev, "problem resetting device");
200 int adis16240_set_irq(struct iio_dev *indio_dev, bool enable)
205 ret = adis16240_spi_read_reg_16(indio_dev,
206 ADIS16240_MSC_CTRL, &msc);
210 msc |= ADIS16240_MSC_CTRL_ACTIVE_HIGH;
211 msc &= ~ADIS16240_MSC_CTRL_DATA_RDY_DIO2;
213 msc |= ADIS16240_MSC_CTRL_DATA_RDY_EN;
215 msc &= ~ADIS16240_MSC_CTRL_DATA_RDY_EN;
217 ret = adis16240_spi_write_reg_16(indio_dev,
218 ADIS16240_MSC_CTRL, msc);
224 static int adis16240_self_test(struct iio_dev *indio_dev)
227 ret = adis16240_spi_write_reg_16(indio_dev,
229 ADIS16240_MSC_CTRL_SELF_TEST_EN);
231 dev_err(&indio_dev->dev, "problem starting self test");
235 msleep(ADIS16240_STARTUP_DELAY);
237 adis16240_check_status(indio_dev);
243 static int adis16240_check_status(struct iio_dev *indio_dev)
247 struct device *dev = &indio_dev->dev;
249 ret = adis16240_spi_read_reg_16(indio_dev,
250 ADIS16240_DIAG_STAT, &status);
253 dev_err(dev, "Reading status failed\n");
258 if (status & ADIS16240_DIAG_STAT_PWRON_FAIL)
259 dev_err(dev, "Power-on, self-test fail\n");
260 if (status & ADIS16240_DIAG_STAT_SPI_FAIL)
261 dev_err(dev, "SPI failure\n");
262 if (status & ADIS16240_DIAG_STAT_FLASH_UPT)
263 dev_err(dev, "Flash update failed\n");
264 if (status & ADIS16240_DIAG_STAT_POWER_HIGH)
265 dev_err(dev, "Power supply above 3.625V\n");
266 if (status & ADIS16240_DIAG_STAT_POWER_LOW)
267 dev_err(dev, "Power supply below 2.225V\n");
273 static int adis16240_initial_setup(struct iio_dev *indio_dev)
276 struct device *dev = &indio_dev->dev;
279 ret = adis16240_set_irq(indio_dev, false);
281 dev_err(dev, "disable irq failed");
286 ret = adis16240_self_test(indio_dev);
288 dev_err(dev, "self test failure");
292 /* Read status register to check the result */
293 ret = adis16240_check_status(indio_dev);
295 adis16240_reset(indio_dev);
296 dev_err(dev, "device not playing ball -> reset");
297 msleep(ADIS16240_STARTUP_DELAY);
298 ret = adis16240_check_status(indio_dev);
300 dev_err(dev, "giving up");
309 static IIO_DEVICE_ATTR(in_accel_xyz_squared_peak_raw, S_IRUGO,
310 adis16240_read_12bit_signed, NULL,
311 ADIS16240_XYZPEAK_OUT);
313 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("4096");
315 enum adis16240_chan {
324 static const u8 adis16240_addresses[6][3] = {
325 [in_supply] = { ADIS16240_SUPPLY_OUT },
326 [in_aux] = { ADIS16240_AUX_ADC },
327 [accel_x] = { ADIS16240_XACCL_OUT, ADIS16240_XACCL_OFF,
328 ADIS16240_XPEAK_OUT },
329 [accel_y] = { ADIS16240_YACCL_OUT, ADIS16240_YACCL_OFF,
330 ADIS16240_YPEAK_OUT },
331 [accel_z] = { ADIS16240_ZACCL_OUT, ADIS16240_ZACCL_OFF,
332 ADIS16240_ZPEAK_OUT },
333 [temp] = { ADIS16240_TEMP_OUT },
336 static int adis16240_read_raw(struct iio_dev *indio_dev,
337 struct iio_chan_spec const *chan,
347 case IIO_CHAN_INFO_RAW:
348 mutex_lock(&indio_dev->mlock);
349 addr = adis16240_addresses[chan->address][0];
350 ret = adis16240_spi_read_reg_16(indio_dev, addr, &val16);
352 mutex_unlock(&indio_dev->mlock);
356 if (val16 & ADIS16240_ERROR_ACTIVE) {
357 ret = adis16240_check_status(indio_dev);
359 mutex_unlock(&indio_dev->mlock);
363 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
364 if (chan->scan_type.sign == 's')
365 val16 = (s16)(val16 <<
366 (16 - chan->scan_type.realbits)) >>
367 (16 - chan->scan_type.realbits);
369 mutex_unlock(&indio_dev->mlock);
371 case IIO_CHAN_INFO_SCALE:
372 switch (chan->type) {
374 if (chan->channel == 0) {
376 *val2 = 880000; /* 4.88 mV */
377 return IIO_VAL_INT_PLUS_MICRO;
382 *val = 244; /* 0.244 C */
384 return IIO_VAL_INT_PLUS_MICRO;
387 *val2 = IIO_G_TO_M_S_2(51400); /* 51.4 mg */
388 return IIO_VAL_INT_PLUS_MICRO;
393 case IIO_CHAN_INFO_PEAK_SCALE:
395 *val2 = IIO_G_TO_M_S_2(51400); /* 51.4 mg */
396 return IIO_VAL_INT_PLUS_MICRO;
397 case IIO_CHAN_INFO_OFFSET:
398 *val = 25000 / 244 - 0x133; /* 25 C = 0x133 */
400 case IIO_CHAN_INFO_CALIBBIAS:
402 mutex_lock(&indio_dev->mlock);
403 addr = adis16240_addresses[chan->address][1];
404 ret = adis16240_spi_read_reg_16(indio_dev, addr, &val16);
406 mutex_unlock(&indio_dev->mlock);
409 val16 &= (1 << bits) - 1;
410 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
412 mutex_unlock(&indio_dev->mlock);
414 case IIO_CHAN_INFO_PEAK:
416 mutex_lock(&indio_dev->mlock);
417 addr = adis16240_addresses[chan->address][2];
418 ret = adis16240_spi_read_reg_16(indio_dev, addr, &val16);
420 mutex_unlock(&indio_dev->mlock);
423 val16 &= (1 << bits) - 1;
424 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
426 mutex_unlock(&indio_dev->mlock);
432 static int adis16240_write_raw(struct iio_dev *indio_dev,
433 struct iio_chan_spec const *chan,
442 case IIO_CHAN_INFO_CALIBBIAS:
443 val16 = val & ((1 << bits) - 1);
444 addr = adis16240_addresses[chan->address][1];
445 return adis16240_spi_write_reg_16(indio_dev, addr, val16);
450 static const struct iio_chan_spec adis16240_channels[] = {
455 .extend_name = "supply",
456 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
457 IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
458 .address = in_supply,
459 .scan_index = ADIS16240_SCAN_SUPPLY,
469 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
471 .scan_index = ADIS16240_SCAN_AUX_ADC,
480 .channel2 = IIO_MOD_X,
481 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
482 IIO_CHAN_INFO_SCALE_SHARED_BIT |
483 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
484 IIO_CHAN_INFO_PEAK_SEPARATE_BIT,
486 .scan_index = ADIS16240_SCAN_ACC_X,
495 .channel2 = IIO_MOD_Y,
496 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
497 IIO_CHAN_INFO_SCALE_SHARED_BIT |
498 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
499 IIO_CHAN_INFO_PEAK_SEPARATE_BIT,
501 .scan_index = ADIS16240_SCAN_ACC_Y,
510 .channel2 = IIO_MOD_Z,
511 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
512 IIO_CHAN_INFO_SCALE_SHARED_BIT |
513 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
514 IIO_CHAN_INFO_PEAK_SEPARATE_BIT,
516 .scan_index = ADIS16240_SCAN_ACC_Z,
526 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
527 IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
529 .scan_index = ADIS16240_SCAN_TEMP,
536 IIO_CHAN_SOFT_TIMESTAMP(6)
539 static struct attribute *adis16240_attributes[] = {
540 &iio_dev_attr_in_accel_xyz_squared_peak_raw.dev_attr.attr,
541 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
545 static const struct attribute_group adis16240_attribute_group = {
546 .attrs = adis16240_attributes,
549 static const struct iio_info adis16240_info = {
550 .attrs = &adis16240_attribute_group,
551 .read_raw = &adis16240_read_raw,
552 .write_raw = &adis16240_write_raw,
553 .driver_module = THIS_MODULE,
556 static int __devinit adis16240_probe(struct spi_device *spi)
559 struct adis16240_state *st;
560 struct iio_dev *indio_dev;
562 /* setup the industrialio driver allocated elements */
563 indio_dev = iio_device_alloc(sizeof(*st));
564 if (indio_dev == NULL) {
568 st = iio_priv(indio_dev);
569 /* this is only used for removal purposes */
570 spi_set_drvdata(spi, indio_dev);
573 mutex_init(&st->buf_lock);
575 indio_dev->name = spi->dev.driver->name;
576 indio_dev->dev.parent = &spi->dev;
577 indio_dev->info = &adis16240_info;
578 indio_dev->channels = adis16240_channels;
579 indio_dev->num_channels = ARRAY_SIZE(adis16240_channels);
580 indio_dev->modes = INDIO_DIRECT_MODE;
582 ret = adis16240_configure_ring(indio_dev);
586 ret = iio_buffer_register(indio_dev,
588 ARRAY_SIZE(adis16240_channels));
590 printk(KERN_ERR "failed to initialize the ring\n");
591 goto error_unreg_ring_funcs;
595 ret = adis16240_probe_trigger(indio_dev);
597 goto error_uninitialize_ring;
600 /* Get the device into a sane initial state */
601 ret = adis16240_initial_setup(indio_dev);
603 goto error_remove_trigger;
604 ret = iio_device_register(indio_dev);
606 goto error_remove_trigger;
609 error_remove_trigger:
610 adis16240_remove_trigger(indio_dev);
611 error_uninitialize_ring:
612 iio_buffer_unregister(indio_dev);
613 error_unreg_ring_funcs:
614 adis16240_unconfigure_ring(indio_dev);
616 iio_device_free(indio_dev);
621 static int __devexit adis16240_remove(struct spi_device *spi)
624 struct iio_dev *indio_dev = spi_get_drvdata(spi);
626 iio_device_unregister(indio_dev);
627 adis16240_remove_trigger(indio_dev);
628 iio_buffer_unregister(indio_dev);
629 adis16240_unconfigure_ring(indio_dev);
630 iio_device_free(indio_dev);
635 static struct spi_driver adis16240_driver = {
638 .owner = THIS_MODULE,
640 .probe = adis16240_probe,
641 .remove = __devexit_p(adis16240_remove),
643 module_spi_driver(adis16240_driver);
645 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
646 MODULE_DESCRIPTION("Analog Devices Programmable Impact Sensor and Recorder");
647 MODULE_LICENSE("GPL v2");
648 MODULE_ALIAS("spi:adis16240");