2 * ADIS16201 Programmable Digital Vibration Sensor driver
4 * Copyright 2010 Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
9 #include <linux/delay.h>
10 #include <linux/mutex.h>
11 #include <linux/device.h>
12 #include <linux/kernel.h>
13 #include <linux/spi/spi.h>
14 #include <linux/slab.h>
15 #include <linux/sysfs.h>
16 #include <linux/module.h>
18 #include <linux/iio/iio.h>
19 #include <linux/iio/sysfs.h>
20 #include <linux/iio/buffer.h>
22 #include "adis16201.h"
35 * adis16201_spi_write_reg_8() - write single byte to a register
36 * @dev: device associated with child of actual device (iio_dev or iio_trig)
37 * @reg_address: the address of the register to be written
38 * @val: the value to write
40 static int adis16201_spi_write_reg_8(struct iio_dev *indio_dev,
45 struct adis16201_state *st = iio_priv(indio_dev);
47 mutex_lock(&st->buf_lock);
48 st->tx[0] = ADIS16201_WRITE_REG(reg_address);
51 ret = spi_write(st->us, st->tx, 2);
52 mutex_unlock(&st->buf_lock);
58 * adis16201_spi_write_reg_16() - write 2 bytes to a pair of registers
59 * @indio_dev: iio device associated with child of actual device
60 * @reg_address: the address of the lower of the two registers. Second register
61 * is assumed to have address one greater.
62 * @val: value to be written
64 static int adis16201_spi_write_reg_16(struct iio_dev *indio_dev,
69 struct spi_message msg;
70 struct adis16201_state *st = iio_priv(indio_dev);
71 struct spi_transfer xfers[] = {
84 mutex_lock(&st->buf_lock);
85 st->tx[0] = ADIS16201_WRITE_REG(lower_reg_address);
86 st->tx[1] = value & 0xFF;
87 st->tx[2] = ADIS16201_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 * adis16201_spi_read_reg_16() - read 2 bytes from a 16-bit register
101 * @indio_dev: iio device associated with child of actual 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 adis16201_spi_read_reg_16(struct iio_dev *indio_dev,
107 u8 lower_reg_address,
110 struct spi_message msg;
111 struct adis16201_state *st = iio_priv(indio_dev);
113 struct spi_transfer xfers[] = {
128 mutex_lock(&st->buf_lock);
129 st->tx[0] = ADIS16201_READ_REG(lower_reg_address);
132 spi_message_init(&msg);
133 spi_message_add_tail(&xfers[0], &msg);
134 spi_message_add_tail(&xfers[1], &msg);
135 ret = spi_sync(st->us, &msg);
137 dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
141 *val = (st->rx[0] << 8) | st->rx[1];
144 mutex_unlock(&st->buf_lock);
148 static int adis16201_reset(struct iio_dev *indio_dev)
151 struct adis16201_state *st = iio_priv(indio_dev);
153 ret = adis16201_spi_write_reg_8(indio_dev,
155 ADIS16201_GLOB_CMD_SW_RESET);
157 dev_err(&st->us->dev, "problem resetting device");
162 int adis16201_set_irq(struct iio_dev *indio_dev, bool enable)
167 ret = adis16201_spi_read_reg_16(indio_dev, ADIS16201_MSC_CTRL, &msc);
171 msc |= ADIS16201_MSC_CTRL_ACTIVE_HIGH;
172 msc &= ~ADIS16201_MSC_CTRL_DATA_RDY_DIO1;
174 msc |= ADIS16201_MSC_CTRL_DATA_RDY_EN;
176 msc &= ~ADIS16201_MSC_CTRL_DATA_RDY_EN;
178 ret = adis16201_spi_write_reg_16(indio_dev, ADIS16201_MSC_CTRL, msc);
184 static int adis16201_check_status(struct iio_dev *indio_dev)
189 ret = adis16201_spi_read_reg_16(indio_dev,
190 ADIS16201_DIAG_STAT, &status);
192 dev_err(&indio_dev->dev, "Reading status failed\n");
199 if (status & ADIS16201_DIAG_STAT_SPI_FAIL)
200 dev_err(&indio_dev->dev, "SPI failure\n");
201 if (status & ADIS16201_DIAG_STAT_FLASH_UPT)
202 dev_err(&indio_dev->dev, "Flash update failed\n");
203 if (status & ADIS16201_DIAG_STAT_POWER_HIGH)
204 dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
205 if (status & ADIS16201_DIAG_STAT_POWER_LOW)
206 dev_err(&indio_dev->dev, "Power supply below 3.15V\n");
212 static int adis16201_self_test(struct iio_dev *indio_dev)
215 ret = adis16201_spi_write_reg_16(indio_dev,
217 ADIS16201_MSC_CTRL_SELF_TEST_EN);
219 dev_err(&indio_dev->dev, "problem starting self test");
223 ret = adis16201_check_status(indio_dev);
229 static int adis16201_initial_setup(struct iio_dev *indio_dev)
232 struct device *dev = &indio_dev->dev;
235 ret = adis16201_set_irq(indio_dev, false);
237 dev_err(dev, "disable irq failed");
242 ret = adis16201_self_test(indio_dev);
244 dev_err(dev, "self test failure");
248 /* Read status register to check the result */
249 ret = adis16201_check_status(indio_dev);
251 adis16201_reset(indio_dev);
252 dev_err(dev, "device not playing ball -> reset");
253 msleep(ADIS16201_STARTUP_DELAY);
254 ret = adis16201_check_status(indio_dev);
256 dev_err(dev, "giving up");
265 static u8 adis16201_addresses[7][2] = {
266 [in_supply] = { ADIS16201_SUPPLY_OUT, },
267 [temp] = { ADIS16201_TEMP_OUT },
268 [accel_x] = { ADIS16201_XACCL_OUT, ADIS16201_XACCL_OFFS },
269 [accel_y] = { ADIS16201_YACCL_OUT, ADIS16201_YACCL_OFFS },
270 [in_aux] = { ADIS16201_AUX_ADC },
271 [incli_x] = { ADIS16201_XINCL_OUT },
272 [incli_y] = { ADIS16201_YINCL_OUT },
275 static int adis16201_read_raw(struct iio_dev *indio_dev,
276 struct iio_chan_spec const *chan,
286 case IIO_CHAN_INFO_RAW:
287 mutex_lock(&indio_dev->mlock);
288 addr = adis16201_addresses[chan->address][0];
289 ret = adis16201_spi_read_reg_16(indio_dev, addr, &val16);
291 mutex_unlock(&indio_dev->mlock);
295 if (val16 & ADIS16201_ERROR_ACTIVE) {
296 ret = adis16201_check_status(indio_dev);
298 mutex_unlock(&indio_dev->mlock);
302 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
303 if (chan->scan_type.sign == 's')
304 val16 = (s16)(val16 <<
305 (16 - chan->scan_type.realbits)) >>
306 (16 - chan->scan_type.realbits);
308 mutex_unlock(&indio_dev->mlock);
310 case IIO_CHAN_INFO_SCALE:
311 switch (chan->type) {
314 if (chan->channel == 0)
318 return IIO_VAL_INT_PLUS_MICRO;
322 return IIO_VAL_INT_PLUS_MICRO;
326 return IIO_VAL_INT_PLUS_MICRO;
330 return IIO_VAL_INT_PLUS_MICRO;
335 case IIO_CHAN_INFO_OFFSET:
338 case IIO_CHAN_INFO_CALIBBIAS:
339 switch (chan->type) {
349 mutex_lock(&indio_dev->mlock);
350 addr = adis16201_addresses[chan->address][1];
351 ret = adis16201_spi_read_reg_16(indio_dev, addr, &val16);
353 mutex_unlock(&indio_dev->mlock);
356 val16 &= (1 << bits) - 1;
357 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
359 mutex_unlock(&indio_dev->mlock);
365 static int adis16201_write_raw(struct iio_dev *indio_dev,
366 struct iio_chan_spec const *chan,
375 case IIO_CHAN_INFO_CALIBBIAS:
376 switch (chan->type) {
386 val16 = val & ((1 << bits) - 1);
387 addr = adis16201_addresses[chan->address][1];
388 return adis16201_spi_write_reg_16(indio_dev, addr, val16);
393 static struct iio_chan_spec adis16201_channels[] = {
398 .extend_name = "supply",
399 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
400 IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
401 .address = in_supply,
402 .scan_index = ADIS16201_SCAN_SUPPLY,
412 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
413 IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
414 IIO_CHAN_INFO_OFFSET_SEPARATE_BIT,
416 .scan_index = ADIS16201_SCAN_TEMP,
425 .channel2 = IIO_MOD_X,
426 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
427 IIO_CHAN_INFO_SCALE_SHARED_BIT |
428 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,
430 .scan_index = ADIS16201_SCAN_ACC_X,
439 .channel2 = IIO_MOD_Y,
440 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
441 IIO_CHAN_INFO_SCALE_SHARED_BIT |
442 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,
444 .scan_index = ADIS16201_SCAN_ACC_Y,
454 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
455 IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
457 .scan_index = ADIS16201_SCAN_AUX_ADC,
466 .channel2 = IIO_MOD_X,
467 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
468 IIO_CHAN_INFO_SCALE_SHARED_BIT |
469 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,
471 .scan_index = ADIS16201_SCAN_INCLI_X,
480 .channel2 = IIO_MOD_Y,
481 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
482 IIO_CHAN_INFO_SCALE_SHARED_BIT |
483 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,
485 .scan_index = ADIS16201_SCAN_INCLI_Y,
492 IIO_CHAN_SOFT_TIMESTAMP(7)
495 static const struct iio_info adis16201_info = {
496 .read_raw = &adis16201_read_raw,
497 .write_raw = &adis16201_write_raw,
498 .driver_module = THIS_MODULE,
501 static int __devinit adis16201_probe(struct spi_device *spi)
504 struct adis16201_state *st;
505 struct iio_dev *indio_dev;
507 /* setup the industrialio driver allocated elements */
508 indio_dev = iio_device_alloc(sizeof(*st));
509 if (indio_dev == NULL) {
513 st = iio_priv(indio_dev);
514 /* this is only used for removal purposes */
515 spi_set_drvdata(spi, indio_dev);
518 mutex_init(&st->buf_lock);
520 indio_dev->name = spi->dev.driver->name;
521 indio_dev->dev.parent = &spi->dev;
522 indio_dev->info = &adis16201_info;
524 indio_dev->channels = adis16201_channels;
525 indio_dev->num_channels = ARRAY_SIZE(adis16201_channels);
526 indio_dev->modes = INDIO_DIRECT_MODE;
528 ret = adis16201_configure_ring(indio_dev);
532 ret = iio_buffer_register(indio_dev,
534 ARRAY_SIZE(adis16201_channels));
536 printk(KERN_ERR "failed to initialize the ring\n");
537 goto error_unreg_ring_funcs;
541 ret = adis16201_probe_trigger(indio_dev);
543 goto error_uninitialize_ring;
546 /* Get the device into a sane initial state */
547 ret = adis16201_initial_setup(indio_dev);
549 goto error_remove_trigger;
551 ret = iio_device_register(indio_dev);
553 goto error_remove_trigger;
556 error_remove_trigger:
557 adis16201_remove_trigger(indio_dev);
558 error_uninitialize_ring:
559 iio_buffer_unregister(indio_dev);
560 error_unreg_ring_funcs:
561 adis16201_unconfigure_ring(indio_dev);
563 iio_device_free(indio_dev);
568 static int adis16201_remove(struct spi_device *spi)
570 struct iio_dev *indio_dev = spi_get_drvdata(spi);
572 iio_device_unregister(indio_dev);
573 adis16201_remove_trigger(indio_dev);
574 iio_buffer_unregister(indio_dev);
575 adis16201_unconfigure_ring(indio_dev);
576 iio_device_free(indio_dev);
581 static struct spi_driver adis16201_driver = {
584 .owner = THIS_MODULE,
586 .probe = adis16201_probe,
587 .remove = __devexit_p(adis16201_remove),
589 module_spi_driver(adis16201_driver);
591 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
592 MODULE_DESCRIPTION("Analog Devices ADIS16201 Programmable Digital Vibration Sensor driver");
593 MODULE_LICENSE("GPL v2");
594 MODULE_ALIAS("spi:adis16201");