2 * ADIS16203 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>
20 #include "../buffer_generic.h"
22 #include "adis16203.h"
24 #define DRIVER_NAME "adis16203"
27 * adis16203_spi_write_reg_8() - write single byte to a register
28 * @indio_dev: iio device associated with child of actual device
29 * @reg_address: the address of the register to be written
30 * @val: the value to write
32 static int adis16203_spi_write_reg_8(struct iio_dev *indio_dev,
37 struct adis16203_state *st = iio_priv(indio_dev);
39 mutex_lock(&st->buf_lock);
40 st->tx[0] = ADIS16203_WRITE_REG(reg_address);
43 ret = spi_write(st->us, st->tx, 2);
44 mutex_unlock(&st->buf_lock);
50 * adis16203_spi_write_reg_16() - write 2 bytes to a pair of registers
51 * @indio_dev: iio device associated with child of actual device
52 * @reg_address: the address of the lower of the two registers. Second register
53 * is assumed to have address one greater.
54 * @val: value to be written
56 static int adis16203_spi_write_reg_16(struct iio_dev *indio_dev,
61 struct spi_message msg;
62 struct adis16203_state *st = iio_priv(indio_dev);
63 struct spi_transfer xfers[] = {
76 mutex_lock(&st->buf_lock);
77 st->tx[0] = ADIS16203_WRITE_REG(lower_reg_address);
78 st->tx[1] = value & 0xFF;
79 st->tx[2] = ADIS16203_WRITE_REG(lower_reg_address + 1);
80 st->tx[3] = (value >> 8) & 0xFF;
82 spi_message_init(&msg);
83 spi_message_add_tail(&xfers[0], &msg);
84 spi_message_add_tail(&xfers[1], &msg);
85 ret = spi_sync(st->us, &msg);
86 mutex_unlock(&st->buf_lock);
92 * adis16203_spi_read_reg_16() - read 2 bytes from a 16-bit register
93 * @indio_dev: iio device associated with child of actual device
94 * @reg_address: the address of the lower of the two registers. Second register
95 * is assumed to have address one greater.
96 * @val: somewhere to pass back the value read
98 static int adis16203_spi_read_reg_16(struct iio_dev *indio_dev,
102 struct spi_message msg;
103 struct adis16203_state *st = iio_priv(indio_dev);
105 struct spi_transfer xfers[] = {
120 mutex_lock(&st->buf_lock);
121 st->tx[0] = ADIS16203_READ_REG(lower_reg_address);
124 spi_message_init(&msg);
125 spi_message_add_tail(&xfers[0], &msg);
126 spi_message_add_tail(&xfers[1], &msg);
127 ret = spi_sync(st->us, &msg);
129 dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
133 *val = (st->rx[0] << 8) | st->rx[1];
136 mutex_unlock(&st->buf_lock);
140 static int adis16203_check_status(struct iio_dev *indio_dev)
145 ret = adis16203_spi_read_reg_16(indio_dev,
149 dev_err(&indio_dev->dev, "Reading status failed\n");
154 if (status & ADIS16203_DIAG_STAT_SELFTEST_FAIL)
155 dev_err(&indio_dev->dev, "Self test failure\n");
156 if (status & ADIS16203_DIAG_STAT_SPI_FAIL)
157 dev_err(&indio_dev->dev, "SPI failure\n");
158 if (status & ADIS16203_DIAG_STAT_FLASH_UPT)
159 dev_err(&indio_dev->dev, "Flash update failed\n");
160 if (status & ADIS16203_DIAG_STAT_POWER_HIGH)
161 dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
162 if (status & ADIS16203_DIAG_STAT_POWER_LOW)
163 dev_err(&indio_dev->dev, "Power supply below 3.15V\n");
169 static int adis16203_reset(struct iio_dev *indio_dev)
172 ret = adis16203_spi_write_reg_8(indio_dev,
174 ADIS16203_GLOB_CMD_SW_RESET);
176 dev_err(&indio_dev->dev, "problem resetting device");
181 static ssize_t adis16203_write_reset(struct device *dev,
182 struct device_attribute *attr,
183 const char *buf, size_t len)
185 struct iio_dev *indio_dev = dev_get_drvdata(dev);
192 return adis16203_reset(indio_dev);
197 int adis16203_set_irq(struct iio_dev *indio_dev, bool enable)
202 ret = adis16203_spi_read_reg_16(indio_dev, ADIS16203_MSC_CTRL, &msc);
206 msc |= ADIS16203_MSC_CTRL_ACTIVE_HIGH;
207 msc &= ~ADIS16203_MSC_CTRL_DATA_RDY_DIO1;
209 msc |= ADIS16203_MSC_CTRL_DATA_RDY_EN;
211 msc &= ~ADIS16203_MSC_CTRL_DATA_RDY_EN;
213 ret = adis16203_spi_write_reg_16(indio_dev, ADIS16203_MSC_CTRL, msc);
219 static int adis16203_self_test(struct iio_dev *indio_dev)
222 ret = adis16203_spi_write_reg_16(indio_dev,
224 ADIS16203_MSC_CTRL_SELF_TEST_EN);
226 dev_err(&indio_dev->dev, "problem starting self test");
230 adis16203_check_status(indio_dev);
236 static int adis16203_initial_setup(struct iio_dev *indio_dev)
241 ret = adis16203_set_irq(indio_dev, false);
243 dev_err(&indio_dev->dev, "disable irq failed");
248 ret = adis16203_self_test(indio_dev);
250 dev_err(&indio_dev->dev, "self test failure");
254 /* Read status register to check the result */
255 ret = adis16203_check_status(indio_dev);
257 adis16203_reset(indio_dev);
258 dev_err(&indio_dev->dev, "device not playing ball -> reset");
259 msleep(ADIS16203_STARTUP_DELAY);
260 ret = adis16203_check_status(indio_dev);
262 dev_err(&indio_dev->dev, "giving up");
271 enum adis16203_chan {
279 static u8 adis16203_addresses[5][2] = {
280 [in_supply] = { ADIS16203_SUPPLY_OUT },
281 [in_aux] = { ADIS16203_AUX_ADC },
282 [incli_x] = { ADIS16203_XINCL_OUT, ADIS16203_INCL_NULL},
283 [incli_y] = { ADIS16203_YINCL_OUT },
284 [temp] = { ADIS16203_TEMP_OUT }
287 static int adis16203_write_raw(struct iio_dev *indio_dev,
288 struct iio_chan_spec const *chan,
293 /* currently only one writable parameter which keeps this simple */
294 u8 addr = adis16203_addresses[chan->address][1];
295 return adis16203_spi_write_reg_16(indio_dev, addr, val & 0x3FFF);
298 static int adis16203_read_raw(struct iio_dev *indio_dev,
299 struct iio_chan_spec const *chan,
309 mutex_lock(&indio_dev->mlock);
310 addr = adis16203_addresses[chan->address][0];
311 ret = adis16203_spi_read_reg_16(indio_dev, addr, &val16);
313 mutex_unlock(&indio_dev->mlock);
317 if (val16 & ADIS16203_ERROR_ACTIVE) {
318 ret = adis16203_check_status(indio_dev);
320 mutex_unlock(&indio_dev->mlock);
324 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
325 if (chan->scan_type.sign == 's')
326 val16 = (s16)(val16 <<
327 (16 - chan->scan_type.realbits)) >>
328 (16 - chan->scan_type.realbits);
330 mutex_unlock(&indio_dev->mlock);
332 case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
333 case (1 << IIO_CHAN_INFO_SCALE_SHARED):
334 switch (chan->type) {
337 if (chan->channel == 0)
341 return IIO_VAL_INT_PLUS_MICRO;
345 return IIO_VAL_INT_PLUS_MICRO;
349 return IIO_VAL_INT_PLUS_MICRO;
353 case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
356 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
358 mutex_lock(&indio_dev->mlock);
359 addr = adis16203_addresses[chan->address][1];
360 ret = adis16203_spi_read_reg_16(indio_dev, addr, &val16);
362 mutex_unlock(&indio_dev->mlock);
365 val16 &= (1 << bits) - 1;
366 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
368 mutex_unlock(&indio_dev->mlock);
375 static struct iio_chan_spec adis16203_channels[] = {
376 IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, "supply", 0, 0,
377 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
378 in_supply, ADIS16203_SCAN_SUPPLY,
379 IIO_ST('u', 12, 16, 0), 0),
380 IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, NULL, 1, 0,
381 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
382 in_aux, ADIS16203_SCAN_AUX_ADC,
383 IIO_ST('u', 12, 16, 0), 0),
384 IIO_CHAN(IIO_INCLI, 1, 0, 0, NULL, 0, IIO_MOD_X,
385 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
386 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
387 incli_x, ADIS16203_SCAN_INCLI_X,
388 IIO_ST('s', 14, 16, 0), 0),
389 /* Fixme: Not what it appears to be - see data sheet */
390 IIO_CHAN(IIO_INCLI, 1, 0, 0, NULL, 0, IIO_MOD_Y,
391 (1 << IIO_CHAN_INFO_SCALE_SHARED),
392 incli_y, ADIS16203_SCAN_INCLI_Y,
393 IIO_ST('s', 14, 16, 0), 0),
394 IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0,
395 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
396 (1 << IIO_CHAN_INFO_OFFSET_SEPARATE),
397 temp, ADIS16203_SCAN_TEMP,
398 IIO_ST('u', 12, 16, 0), 0),
399 IIO_CHAN_SOFT_TIMESTAMP(5),
402 static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16203_write_reset, 0);
404 static struct attribute *adis16203_attributes[] = {
405 &iio_dev_attr_reset.dev_attr.attr,
409 static const struct attribute_group adis16203_attribute_group = {
410 .attrs = adis16203_attributes,
413 static const struct iio_info adis16203_info = {
414 .attrs = &adis16203_attribute_group,
415 .read_raw = &adis16203_read_raw,
416 .write_raw = &adis16203_write_raw,
417 .driver_module = THIS_MODULE,
420 static int __devinit adis16203_probe(struct spi_device *spi)
423 struct iio_dev *indio_dev;
424 struct adis16203_state *st;
426 /* setup the industrialio driver allocated elements */
427 indio_dev = iio_allocate_device(sizeof(*st));
428 if (indio_dev == NULL) {
432 st = iio_priv(indio_dev);
433 /* this is only used for removal purposes */
434 spi_set_drvdata(spi, indio_dev);
436 mutex_init(&st->buf_lock);
438 indio_dev->name = spi->dev.driver->name;
439 indio_dev->dev.parent = &spi->dev;
440 indio_dev->channels = adis16203_channels;
441 indio_dev->num_channels = ARRAY_SIZE(adis16203_channels);
442 indio_dev->info = &adis16203_info;
443 indio_dev->modes = INDIO_DIRECT_MODE;
445 ret = adis16203_configure_ring(indio_dev);
449 ret = iio_buffer_register(indio_dev,
451 ARRAY_SIZE(adis16203_channels));
453 printk(KERN_ERR "failed to initialize the ring\n");
454 goto error_unreg_ring_funcs;
458 ret = adis16203_probe_trigger(indio_dev);
460 goto error_uninitialize_ring;
463 /* Get the device into a sane initial state */
464 ret = adis16203_initial_setup(indio_dev);
466 goto error_remove_trigger;
468 ret = iio_device_register(indio_dev);
470 goto error_remove_trigger;
474 error_remove_trigger:
475 adis16203_remove_trigger(indio_dev);
476 error_uninitialize_ring:
477 iio_buffer_unregister(indio_dev);
478 error_unreg_ring_funcs:
479 adis16203_unconfigure_ring(indio_dev);
481 iio_free_device(indio_dev);
486 static int adis16203_remove(struct spi_device *spi)
488 struct iio_dev *indio_dev = spi_get_drvdata(spi);
490 iio_device_unregister(indio_dev);
491 adis16203_remove_trigger(indio_dev);
492 iio_buffer_unregister(indio_dev);
493 adis16203_unconfigure_ring(indio_dev);
494 iio_free_device(indio_dev);
499 static struct spi_driver adis16203_driver = {
502 .owner = THIS_MODULE,
504 .probe = adis16203_probe,
505 .remove = __devexit_p(adis16203_remove),
508 static __init int adis16203_init(void)
510 return spi_register_driver(&adis16203_driver);
512 module_init(adis16203_init);
514 static __exit void adis16203_exit(void)
516 spi_unregister_driver(&adis16203_driver);
518 module_exit(adis16203_exit);
520 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
521 MODULE_DESCRIPTION("Analog Devices ADIS16203 Programmable Digital Vibration Sensor driver");
522 MODULE_LICENSE("GPL v2");