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>
24 #include "../ring_generic.h"
26 #include "adis16240.h"
28 #define DRIVER_NAME "adis16240"
30 static int adis16240_check_status(struct iio_dev *indio_dev);
33 * adis16240_spi_write_reg_8() - write single byte to a register
34 * @indio_dev: iio_dev associated with device
35 * @reg_address: the address of the register to be written
36 * @val: the value to write
38 static int adis16240_spi_write_reg_8(struct iio_dev *indio_dev,
43 struct adis16240_state *st = iio_priv(indio_dev);
45 mutex_lock(&st->buf_lock);
46 st->tx[0] = ADIS16240_WRITE_REG(reg_address);
49 ret = spi_write(st->us, st->tx, 2);
50 mutex_unlock(&st->buf_lock);
56 * adis16240_spi_write_reg_16() - write 2 bytes to a pair of registers
57 * @indio_dev: iio_dev for this device
58 * @reg_address: the address of the lower of the two registers. Second register
59 * is assumed to have address one greater.
60 * @val: value to be written
62 static int adis16240_spi_write_reg_16(struct iio_dev *indio_dev,
67 struct spi_message msg;
68 struct adis16240_state *st = iio_priv(indio_dev);
69 struct spi_transfer xfers[] = {
84 mutex_lock(&st->buf_lock);
85 st->tx[0] = ADIS16240_WRITE_REG(lower_reg_address);
86 st->tx[1] = value & 0xFF;
87 st->tx[2] = ADIS16240_WRITE_REG(lower_reg_address + 1);
88 st->tx[3] = (value >> 8) & 0xFF;
90 spi_message_init(&msg);
91 spi_message_add_tail(&xfers[0], &msg);
92 spi_message_add_tail(&xfers[1], &msg);
93 ret = spi_sync(st->us, &msg);
94 mutex_unlock(&st->buf_lock);
100 * adis16240_spi_read_reg_16() - read 2 bytes from a 16-bit register
101 * @indio_dev: iio_dev for this device
102 * @reg_address: the address of the lower of the two registers. Second register
103 * is assumed to have address one greater.
104 * @val: somewhere to pass back the value read
106 static int adis16240_spi_read_reg_16(struct iio_dev *indio_dev,
107 u8 lower_reg_address,
110 struct spi_message msg;
111 struct adis16240_state *st = iio_priv(indio_dev);
113 struct spi_transfer xfers[] = {
129 mutex_lock(&st->buf_lock);
130 st->tx[0] = ADIS16240_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 adis16240_spi_read_signed(struct device *dev,
153 struct device_attribute *attr,
157 struct iio_dev *indio_dev = dev_get_drvdata(dev);
160 unsigned shift = 16 - bits;
161 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
163 ret = adis16240_spi_read_reg_16(indio_dev,
164 this_attr->address, (u16 *)&val);
168 if (val & ADIS16240_ERROR_ACTIVE)
169 adis16240_check_status(indio_dev);
171 val = ((s16)(val << shift) >> shift);
172 return sprintf(buf, "%d\n", val);
175 static ssize_t adis16240_read_12bit_signed(struct device *dev,
176 struct device_attribute *attr,
180 struct iio_dev *indio_dev = dev_get_drvdata(dev);
182 /* Take the iio_dev status lock */
183 mutex_lock(&indio_dev->mlock);
184 ret = adis16240_spi_read_signed(dev, attr, buf, 12);
185 mutex_unlock(&indio_dev->mlock);
190 static int adis16240_reset(struct iio_dev *indio_dev)
193 ret = adis16240_spi_write_reg_8(indio_dev,
195 ADIS16240_GLOB_CMD_SW_RESET);
197 dev_err(&indio_dev->dev, "problem resetting device");
202 static ssize_t adis16240_write_reset(struct device *dev,
203 struct device_attribute *attr,
204 const char *buf, size_t len)
206 struct iio_dev *indio_dev = dev_get_drvdata(dev);
214 return adis16240_reset(indio_dev);
219 int adis16240_set_irq(struct iio_dev *indio_dev, bool enable)
224 ret = adis16240_spi_read_reg_16(indio_dev,
225 ADIS16240_MSC_CTRL, &msc);
229 msc |= ADIS16240_MSC_CTRL_ACTIVE_HIGH;
230 msc &= ~ADIS16240_MSC_CTRL_DATA_RDY_DIO2;
232 msc |= ADIS16240_MSC_CTRL_DATA_RDY_EN;
234 msc &= ~ADIS16240_MSC_CTRL_DATA_RDY_EN;
236 ret = adis16240_spi_write_reg_16(indio_dev,
237 ADIS16240_MSC_CTRL, msc);
243 static int adis16240_self_test(struct iio_dev *indio_dev)
246 ret = adis16240_spi_write_reg_16(indio_dev,
248 ADIS16240_MSC_CTRL_SELF_TEST_EN);
250 dev_err(&indio_dev->dev, "problem starting self test");
254 msleep(ADIS16240_STARTUP_DELAY);
256 adis16240_check_status(indio_dev);
262 static int adis16240_check_status(struct iio_dev *indio_dev)
266 struct device *dev = &indio_dev->dev;
268 ret = adis16240_spi_read_reg_16(indio_dev,
269 ADIS16240_DIAG_STAT, &status);
272 dev_err(dev, "Reading status failed\n");
277 if (status & ADIS16240_DIAG_STAT_PWRON_FAIL)
278 dev_err(dev, "Power-on, self-test fail\n");
279 if (status & ADIS16240_DIAG_STAT_SPI_FAIL)
280 dev_err(dev, "SPI failure\n");
281 if (status & ADIS16240_DIAG_STAT_FLASH_UPT)
282 dev_err(dev, "Flash update failed\n");
283 if (status & ADIS16240_DIAG_STAT_POWER_HIGH)
284 dev_err(dev, "Power supply above 3.625V\n");
285 if (status & ADIS16240_DIAG_STAT_POWER_LOW)
286 dev_err(dev, "Power supply below 2.225V\n");
292 static int adis16240_initial_setup(struct iio_dev *indio_dev)
295 struct device *dev = &indio_dev->dev;
298 ret = adis16240_set_irq(indio_dev, false);
300 dev_err(dev, "disable irq failed");
305 ret = adis16240_self_test(indio_dev);
307 dev_err(dev, "self test failure");
311 /* Read status register to check the result */
312 ret = adis16240_check_status(indio_dev);
314 adis16240_reset(indio_dev);
315 dev_err(dev, "device not playing ball -> reset");
316 msleep(ADIS16240_STARTUP_DELAY);
317 ret = adis16240_check_status(indio_dev);
319 dev_err(dev, "giving up");
328 static IIO_DEVICE_ATTR(accel_xyz_squared_peak_raw, S_IRUGO,
329 adis16240_read_12bit_signed, NULL,
330 ADIS16240_XYZPEAK_OUT);
332 static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16240_write_reset, 0);
334 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("4096");
336 enum adis16240_chan {
345 static const u8 adis16240_addresses[6][3] = {
346 [in_supply] = { ADIS16240_SUPPLY_OUT },
347 [in_aux] = { ADIS16240_AUX_ADC },
348 [accel_x] = { ADIS16240_XACCL_OUT, ADIS16240_XACCL_OFF,
349 ADIS16240_XPEAK_OUT },
350 [accel_y] = { ADIS16240_YACCL_OUT, ADIS16240_YACCL_OFF,
351 ADIS16240_YPEAK_OUT },
352 [accel_z] = { ADIS16240_ZACCL_OUT, ADIS16240_ZACCL_OFF,
353 ADIS16240_ZPEAK_OUT },
354 [temp] = { ADIS16240_TEMP_OUT },
357 static int adis16240_read_raw(struct iio_dev *indio_dev,
358 struct iio_chan_spec const *chan,
369 mutex_lock(&indio_dev->mlock);
370 addr = adis16240_addresses[chan->address][0];
371 ret = adis16240_spi_read_reg_16(indio_dev, addr, &val16);
373 mutex_unlock(&indio_dev->mlock);
377 if (val16 & ADIS16240_ERROR_ACTIVE) {
378 ret = adis16240_check_status(indio_dev);
380 mutex_unlock(&indio_dev->mlock);
384 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
385 if (chan->scan_type.sign == 's')
386 val16 = (s16)(val16 <<
387 (16 - chan->scan_type.realbits)) >>
388 (16 - chan->scan_type.realbits);
390 mutex_unlock(&indio_dev->mlock);
392 case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
393 case (1 << IIO_CHAN_INFO_SCALE_SHARED):
394 switch (chan->type) {
397 if (chan->channel == 0)
401 return IIO_VAL_INT_PLUS_MICRO;
405 return IIO_VAL_INT_PLUS_MICRO;
409 return IIO_VAL_INT_PLUS_MICRO;
414 case (1 << IIO_CHAN_INFO_PEAK_SCALE_SHARED):
417 return IIO_VAL_INT_PLUS_MICRO;
418 case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
421 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
423 mutex_lock(&indio_dev->mlock);
424 addr = adis16240_addresses[chan->address][1];
425 ret = adis16240_spi_read_reg_16(indio_dev, addr, &val16);
427 mutex_unlock(&indio_dev->mlock);
430 val16 &= (1 << bits) - 1;
431 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
433 mutex_unlock(&indio_dev->mlock);
435 case (1 << IIO_CHAN_INFO_PEAK_SEPARATE):
437 mutex_lock(&indio_dev->mlock);
438 addr = adis16240_addresses[chan->address][2];
439 ret = adis16240_spi_read_reg_16(indio_dev, addr, &val16);
441 mutex_unlock(&indio_dev->mlock);
444 val16 &= (1 << bits) - 1;
445 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
447 mutex_unlock(&indio_dev->mlock);
453 static int adis16240_write_raw(struct iio_dev *indio_dev,
454 struct iio_chan_spec const *chan,
463 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
464 val16 = val & ((1 << bits) - 1);
465 addr = adis16240_addresses[chan->address][1];
466 return adis16240_spi_write_reg_16(indio_dev, addr, val16);
471 static struct iio_chan_spec adis16240_channels[] = {
472 IIO_CHAN(IIO_IN, 0, 1, 0, "supply", 0, 0,
473 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
474 in_supply, ADIS16240_SCAN_SUPPLY,
475 IIO_ST('u', 10, 16, 0), 0),
476 IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
478 in_aux, ADIS16240_SCAN_AUX_ADC,
479 IIO_ST('u', 10, 16, 0), 0),
480 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X,
481 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
482 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
483 accel_x, ADIS16240_SCAN_ACC_X,
484 IIO_ST('s', 10, 16, 0), 0),
485 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y,
486 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
487 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
488 accel_y, ADIS16240_SCAN_ACC_Y,
489 IIO_ST('s', 10, 16, 0), 0),
490 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Z,
491 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
492 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
493 accel_z, ADIS16240_SCAN_ACC_Z,
494 IIO_ST('s', 10, 16, 0), 0),
495 IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0,
496 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
497 temp, ADIS16240_SCAN_TEMP,
498 IIO_ST('u', 10, 16, 0), 0),
499 IIO_CHAN_SOFT_TIMESTAMP(6)
502 static struct attribute *adis16240_attributes[] = {
503 &iio_dev_attr_accel_xyz_squared_peak_raw.dev_attr.attr,
504 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
505 &iio_dev_attr_reset.dev_attr.attr,
509 static const struct attribute_group adis16240_attribute_group = {
510 .attrs = adis16240_attributes,
513 static const struct iio_info adis16240_info = {
514 .attrs = &adis16240_attribute_group,
515 .read_raw = &adis16240_read_raw,
516 .write_raw = &adis16240_write_raw,
517 .driver_module = THIS_MODULE,
520 static int __devinit adis16240_probe(struct spi_device *spi)
522 int ret, regdone = 0;
523 struct adis16240_state *st;
524 struct iio_dev *indio_dev;
526 /* setup the industrialio driver allocated elements */
527 indio_dev = iio_allocate_device(sizeof(*st));
528 if (indio_dev == NULL) {
532 st = iio_priv(indio_dev);
533 /* this is only used for removal purposes */
534 spi_set_drvdata(spi, indio_dev);
537 mutex_init(&st->buf_lock);
539 indio_dev->name = spi->dev.driver->name;
540 indio_dev->dev.parent = &spi->dev;
541 indio_dev->info = &adis16240_info;
542 indio_dev->channels = adis16240_channels;
543 indio_dev->num_channels = ARRAY_SIZE(adis16240_channels);
544 indio_dev->modes = INDIO_DIRECT_MODE;
546 ret = adis16240_configure_ring(indio_dev);
550 ret = iio_device_register(indio_dev);
552 goto error_unreg_ring_funcs;
555 ret = iio_ring_buffer_register(indio_dev,
557 ARRAY_SIZE(adis16240_channels));
559 printk(KERN_ERR "failed to initialize the ring\n");
560 goto error_unreg_ring_funcs;
564 ret = adis16240_probe_trigger(indio_dev);
566 goto error_uninitialize_ring;
569 /* Get the device into a sane initial state */
570 ret = adis16240_initial_setup(indio_dev);
572 goto error_remove_trigger;
575 error_remove_trigger:
576 adis16240_remove_trigger(indio_dev);
577 error_uninitialize_ring:
578 iio_ring_buffer_unregister(indio_dev);
579 error_unreg_ring_funcs:
580 adis16240_unconfigure_ring(indio_dev);
583 iio_device_unregister(indio_dev);
585 iio_free_device(indio_dev);
590 static int adis16240_remove(struct spi_device *spi)
593 struct iio_dev *indio_dev = spi_get_drvdata(spi);
595 flush_scheduled_work();
597 adis16240_remove_trigger(indio_dev);
598 iio_ring_buffer_unregister(indio_dev);
599 adis16240_unconfigure_ring(indio_dev);
600 iio_device_unregister(indio_dev);
605 static struct spi_driver adis16240_driver = {
608 .owner = THIS_MODULE,
610 .probe = adis16240_probe,
611 .remove = __devexit_p(adis16240_remove),
614 static __init int adis16240_init(void)
616 return spi_register_driver(&adis16240_driver);
618 module_init(adis16240_init);
620 static __exit void adis16240_exit(void)
622 spi_unregister_driver(&adis16240_driver);
624 module_exit(adis16240_exit);
626 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
627 MODULE_DESCRIPTION("Analog Devices Programmable Impact Sensor and Recorder");
628 MODULE_LICENSE("GPL v2");