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>
23 #include "../ring_generic.h"
25 #include "../adc/adc.h"
27 #include "adis16240.h"
29 #define DRIVER_NAME "adis16240"
31 static int adis16240_check_status(struct iio_dev *indio_dev);
34 * adis16240_spi_write_reg_8() - write single byte to a register
35 * @indio_dev: iio_dev associated with device
36 * @reg_address: the address of the register to be written
37 * @val: the value to write
39 static int adis16240_spi_write_reg_8(struct iio_dev *indio_dev,
44 struct adis16240_state *st = iio_priv(indio_dev);
46 mutex_lock(&st->buf_lock);
47 st->tx[0] = ADIS16240_WRITE_REG(reg_address);
50 ret = spi_write(st->us, st->tx, 2);
51 mutex_unlock(&st->buf_lock);
57 * adis16240_spi_write_reg_16() - write 2 bytes to a pair of registers
58 * @indio_dev: iio_dev for this device
59 * @reg_address: the address of the lower of the two registers. Second register
60 * is assumed to have address one greater.
61 * @val: value to be written
63 static int adis16240_spi_write_reg_16(struct iio_dev *indio_dev,
68 struct spi_message msg;
69 struct adis16240_state *st = iio_priv(indio_dev);
70 struct spi_transfer xfers[] = {
85 mutex_lock(&st->buf_lock);
86 st->tx[0] = ADIS16240_WRITE_REG(lower_reg_address);
87 st->tx[1] = value & 0xFF;
88 st->tx[2] = ADIS16240_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 * adis16240_spi_read_reg_16() - read 2 bytes from a 16-bit register
102 * @indio_dev: iio_dev for this device
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 adis16240_spi_read_reg_16(struct iio_dev *indio_dev,
108 u8 lower_reg_address,
111 struct spi_message msg;
112 struct adis16240_state *st = iio_priv(indio_dev);
114 struct spi_transfer xfers[] = {
130 mutex_lock(&st->buf_lock);
131 st->tx[0] = ADIS16240_READ_REG(lower_reg_address);
136 spi_message_init(&msg);
137 spi_message_add_tail(&xfers[0], &msg);
138 spi_message_add_tail(&xfers[1], &msg);
139 ret = spi_sync(st->us, &msg);
141 dev_err(&st->us->dev,
142 "problem when reading 16 bit register 0x%02X",
146 *val = (st->rx[0] << 8) | st->rx[1];
149 mutex_unlock(&st->buf_lock);
153 static ssize_t adis16240_spi_read_signed(struct device *dev,
154 struct device_attribute *attr,
158 struct iio_dev *indio_dev = dev_get_drvdata(dev);
161 unsigned shift = 16 - bits;
162 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
164 ret = adis16240_spi_read_reg_16(indio_dev,
165 this_attr->address, (u16 *)&val);
169 if (val & ADIS16240_ERROR_ACTIVE)
170 adis16240_check_status(indio_dev);
172 val = ((s16)(val << shift) >> shift);
173 return sprintf(buf, "%d\n", val);
176 static ssize_t adis16240_read_12bit_signed(struct device *dev,
177 struct device_attribute *attr,
181 struct iio_dev *indio_dev = dev_get_drvdata(dev);
183 /* Take the iio_dev status lock */
184 mutex_lock(&indio_dev->mlock);
185 ret = adis16240_spi_read_signed(dev, attr, buf, 12);
186 mutex_unlock(&indio_dev->mlock);
191 static int adis16240_reset(struct iio_dev *indio_dev)
194 ret = adis16240_spi_write_reg_8(indio_dev,
196 ADIS16240_GLOB_CMD_SW_RESET);
198 dev_err(&indio_dev->dev, "problem resetting device");
203 static ssize_t adis16240_write_reset(struct device *dev,
204 struct device_attribute *attr,
205 const char *buf, size_t len)
207 struct iio_dev *indio_dev = dev_get_drvdata(dev);
215 return adis16240_reset(indio_dev);
220 int adis16240_set_irq(struct iio_dev *indio_dev, bool enable)
225 ret = adis16240_spi_read_reg_16(indio_dev,
226 ADIS16240_MSC_CTRL, &msc);
230 msc |= ADIS16240_MSC_CTRL_ACTIVE_HIGH;
231 msc &= ~ADIS16240_MSC_CTRL_DATA_RDY_DIO2;
233 msc |= ADIS16240_MSC_CTRL_DATA_RDY_EN;
235 msc &= ~ADIS16240_MSC_CTRL_DATA_RDY_EN;
237 ret = adis16240_spi_write_reg_16(indio_dev,
238 ADIS16240_MSC_CTRL, msc);
244 static int adis16240_self_test(struct iio_dev *indio_dev)
247 ret = adis16240_spi_write_reg_16(indio_dev,
249 ADIS16240_MSC_CTRL_SELF_TEST_EN);
251 dev_err(&indio_dev->dev, "problem starting self test");
255 msleep(ADIS16240_STARTUP_DELAY);
257 adis16240_check_status(indio_dev);
263 static int adis16240_check_status(struct iio_dev *indio_dev)
267 struct device *dev = &indio_dev->dev;
269 ret = adis16240_spi_read_reg_16(indio_dev,
270 ADIS16240_DIAG_STAT, &status);
273 dev_err(dev, "Reading status failed\n");
278 if (status & ADIS16240_DIAG_STAT_PWRON_FAIL)
279 dev_err(dev, "Power-on, self-test fail\n");
280 if (status & ADIS16240_DIAG_STAT_SPI_FAIL)
281 dev_err(dev, "SPI failure\n");
282 if (status & ADIS16240_DIAG_STAT_FLASH_UPT)
283 dev_err(dev, "Flash update failed\n");
284 if (status & ADIS16240_DIAG_STAT_POWER_HIGH)
285 dev_err(dev, "Power supply above 3.625V\n");
286 if (status & ADIS16240_DIAG_STAT_POWER_LOW)
287 dev_err(dev, "Power supply below 2.225V\n");
293 static int adis16240_initial_setup(struct iio_dev *indio_dev)
296 struct device *dev = &indio_dev->dev;
299 ret = adis16240_set_irq(indio_dev, false);
301 dev_err(dev, "disable irq failed");
306 ret = adis16240_self_test(indio_dev);
308 dev_err(dev, "self test failure");
312 /* Read status register to check the result */
313 ret = adis16240_check_status(indio_dev);
315 adis16240_reset(indio_dev);
316 dev_err(dev, "device not playing ball -> reset");
317 msleep(ADIS16240_STARTUP_DELAY);
318 ret = adis16240_check_status(indio_dev);
320 dev_err(dev, "giving up");
329 static IIO_DEVICE_ATTR(accel_xyz_squared_peak_raw, S_IRUGO,
330 adis16240_read_12bit_signed, NULL,
331 ADIS16240_XYZPEAK_OUT);
333 static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16240_write_reset, 0);
335 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("4096");
337 enum adis16240_chan {
346 static const u8 adis16240_addresses[6][3] = {
347 [in_supply] = { ADIS16240_SUPPLY_OUT },
348 [in_aux] = { ADIS16240_AUX_ADC },
349 [accel_x] = { ADIS16240_XACCL_OUT, ADIS16240_XACCL_OFF,
350 ADIS16240_XPEAK_OUT },
351 [accel_y] = { ADIS16240_YACCL_OUT, ADIS16240_YACCL_OFF,
352 ADIS16240_YPEAK_OUT },
353 [accel_z] = { ADIS16240_ZACCL_OUT, ADIS16240_ZACCL_OFF,
354 ADIS16240_ZPEAK_OUT },
355 [temp] = { ADIS16240_TEMP_OUT },
358 static int adis16240_read_raw(struct iio_dev *indio_dev,
359 struct iio_chan_spec const *chan,
370 mutex_lock(&indio_dev->mlock);
371 addr = adis16240_addresses[chan->address][0];
372 ret = adis16240_spi_read_reg_16(indio_dev, addr, &val16);
374 mutex_unlock(&indio_dev->mlock);
378 if (val16 & ADIS16240_ERROR_ACTIVE) {
379 ret = adis16240_check_status(indio_dev);
381 mutex_unlock(&indio_dev->mlock);
385 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
386 if (chan->scan_type.sign == 's')
387 val16 = (s16)(val16 <<
388 (16 - chan->scan_type.realbits)) >>
389 (16 - chan->scan_type.realbits);
391 mutex_unlock(&indio_dev->mlock);
393 case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
394 case (1 << IIO_CHAN_INFO_SCALE_SHARED):
395 switch (chan->type) {
398 if (chan->channel == 0)
402 return IIO_VAL_INT_PLUS_MICRO;
406 return IIO_VAL_INT_PLUS_MICRO;
410 return IIO_VAL_INT_PLUS_MICRO;
415 case (1 << IIO_CHAN_INFO_PEAK_SCALE_SHARED):
418 return IIO_VAL_INT_PLUS_MICRO;
419 case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
422 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
424 mutex_lock(&indio_dev->mlock);
425 addr = adis16240_addresses[chan->address][1];
426 ret = adis16240_spi_read_reg_16(indio_dev, addr, &val16);
428 mutex_unlock(&indio_dev->mlock);
431 val16 &= (1 << bits) - 1;
432 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
434 mutex_unlock(&indio_dev->mlock);
436 case (1 << IIO_CHAN_INFO_PEAK_SEPARATE):
438 mutex_lock(&indio_dev->mlock);
439 addr = adis16240_addresses[chan->address][2];
440 ret = adis16240_spi_read_reg_16(indio_dev, addr, &val16);
442 mutex_unlock(&indio_dev->mlock);
445 val16 &= (1 << bits) - 1;
446 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
448 mutex_unlock(&indio_dev->mlock);
454 static int adis16240_write_raw(struct iio_dev *indio_dev,
455 struct iio_chan_spec const *chan,
464 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
465 val16 = val & ((1 << bits) - 1);
466 addr = adis16240_addresses[chan->address][1];
467 return adis16240_spi_write_reg_16(indio_dev, addr, val16);
472 static struct iio_chan_spec adis16240_channels[] = {
473 IIO_CHAN(IIO_IN, 0, 1, 0, "supply", 0, 0,
474 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
475 in_supply, ADIS16240_SCAN_SUPPLY,
476 IIO_ST('u', 10, 16, 0), 0),
477 IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
479 in_aux, ADIS16240_SCAN_AUX_ADC,
480 IIO_ST('u', 10, 16, 0), 0),
481 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X,
482 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
483 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
484 accel_x, ADIS16240_SCAN_ACC_X,
485 IIO_ST('s', 10, 16, 0), 0),
486 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y,
487 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
488 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
489 accel_y, ADIS16240_SCAN_ACC_Y,
490 IIO_ST('s', 10, 16, 0), 0),
491 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Z,
492 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
493 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
494 accel_z, ADIS16240_SCAN_ACC_Z,
495 IIO_ST('s', 10, 16, 0), 0),
496 IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0,
497 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
498 temp, ADIS16240_SCAN_TEMP,
499 IIO_ST('u', 10, 16, 0), 0),
500 IIO_CHAN_SOFT_TIMESTAMP(6)
503 static struct attribute *adis16240_attributes[] = {
504 &iio_dev_attr_accel_xyz_squared_peak_raw.dev_attr.attr,
505 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
506 &iio_dev_attr_reset.dev_attr.attr,
510 static const struct attribute_group adis16240_attribute_group = {
511 .attrs = adis16240_attributes,
514 static const struct iio_info adis16240_info = {
515 .attrs = &adis16240_attribute_group,
516 .read_raw = &adis16240_read_raw,
517 .write_raw = &adis16240_write_raw,
518 .driver_module = THIS_MODULE,
521 static int __devinit adis16240_probe(struct spi_device *spi)
523 int ret, regdone = 0;
524 struct adis16240_state *st;
525 struct iio_dev *indio_dev;
527 /* setup the industrialio driver allocated elements */
528 indio_dev = iio_allocate_device(sizeof(*st));
529 if (indio_dev == NULL) {
533 st = iio_priv(indio_dev);
534 /* this is only used for removal purposes */
535 spi_set_drvdata(spi, indio_dev);
538 mutex_init(&st->buf_lock);
540 indio_dev->name = spi->dev.driver->name;
541 indio_dev->dev.parent = &spi->dev;
542 indio_dev->info = &adis16240_info;
543 indio_dev->channels = adis16240_channels;
544 indio_dev->num_channels = ARRAY_SIZE(adis16240_channels);
545 indio_dev->modes = INDIO_DIRECT_MODE;
547 ret = adis16240_configure_ring(indio_dev);
551 ret = iio_device_register(indio_dev);
553 goto error_unreg_ring_funcs;
556 ret = iio_ring_buffer_register_ex(indio_dev->ring, 0,
558 ARRAY_SIZE(adis16240_channels));
560 printk(KERN_ERR "failed to initialize the ring\n");
561 goto error_unreg_ring_funcs;
565 ret = adis16240_probe_trigger(indio_dev);
567 goto error_uninitialize_ring;
570 /* Get the device into a sane initial state */
571 ret = adis16240_initial_setup(indio_dev);
573 goto error_remove_trigger;
576 error_remove_trigger:
577 adis16240_remove_trigger(indio_dev);
578 error_uninitialize_ring:
579 iio_ring_buffer_unregister(indio_dev->ring);
580 error_unreg_ring_funcs:
581 adis16240_unconfigure_ring(indio_dev);
584 iio_device_unregister(indio_dev);
586 iio_free_device(indio_dev);
591 static int adis16240_remove(struct spi_device *spi)
594 struct iio_dev *indio_dev = spi_get_drvdata(spi);
596 flush_scheduled_work();
598 adis16240_remove_trigger(indio_dev);
599 iio_ring_buffer_unregister(indio_dev->ring);
600 iio_device_unregister(indio_dev);
601 adis16240_unconfigure_ring(indio_dev);
606 static struct spi_driver adis16240_driver = {
609 .owner = THIS_MODULE,
611 .probe = adis16240_probe,
612 .remove = __devexit_p(adis16240_remove),
615 static __init int adis16240_init(void)
617 return spi_register_driver(&adis16240_driver);
619 module_init(adis16240_init);
621 static __exit void adis16240_exit(void)
623 spi_unregister_driver(&adis16240_driver);
625 module_exit(adis16240_exit);
627 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
628 MODULE_DESCRIPTION("Analog Devices Programmable Impact Sensor and Recorder");
629 MODULE_LICENSE("GPL v2");