/drivers/staging/iio/accel/adis16204_core.c
C | 611 lines | 509 code | 68 blank | 34 comment | 48 complexity | 22d0480e9d5508c61ab560c61bcc719e MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
1/*
2 * ADIS16204 Programmable High-g Digital Impact Sensor and Recorder
3 *
4 * Copyright 2010 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
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
21#include "../iio.h"
22#include "../sysfs.h"
23#include "../ring_generic.h"
24#include "accel.h"
25#include "../adc/adc.h"
26
27#include "adis16204.h"
28
29#define DRIVER_NAME "adis16204"
30
31/**
32 * adis16204_spi_write_reg_8() - write single byte to a register
33 * @dev: device associated with child of actual device (iio_dev or iio_trig)
34 * @reg_address: the address of the register to be written
35 * @val: the value to write
36 **/
37static int adis16204_spi_write_reg_8(struct iio_dev *indio_dev,
38 u8 reg_address,
39 u8 val)
40{
41 int ret;
42 struct adis16204_state *st = iio_dev_get_devdata(indio_dev);
43
44 mutex_lock(&st->buf_lock);
45 st->tx[0] = ADIS16204_WRITE_REG(reg_address);
46 st->tx[1] = val;
47
48 ret = spi_write(st->us, st->tx, 2);
49 mutex_unlock(&st->buf_lock);
50
51 return ret;
52}
53
54/**
55 * adis16204_spi_write_reg_16() - write 2 bytes to a pair of registers
56 * @indio_dev: iio device associated with child of actual device
57 * @reg_address: the address of the lower of the two registers. Second register
58 * is assumed to have address one greater.
59 * @val: value to be written
60 **/
61static int adis16204_spi_write_reg_16(struct iio_dev *indio_dev,
62 u8 lower_reg_address,
63 u16 value)
64{
65 int ret;
66 struct spi_message msg;
67 struct adis16204_state *st = iio_dev_get_devdata(indio_dev);
68 struct spi_transfer xfers[] = {
69 {
70 .tx_buf = st->tx,
71 .bits_per_word = 8,
72 .len = 2,
73 .cs_change = 1,
74 }, {
75 .tx_buf = st->tx + 2,
76 .bits_per_word = 8,
77 .len = 2,
78 .cs_change = 1,
79 },
80 };
81
82 mutex_lock(&st->buf_lock);
83 st->tx[0] = ADIS16204_WRITE_REG(lower_reg_address);
84 st->tx[1] = value & 0xFF;
85 st->tx[2] = ADIS16204_WRITE_REG(lower_reg_address + 1);
86 st->tx[3] = (value >> 8) & 0xFF;
87
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);
93
94 return ret;
95}
96
97/**
98 * adis16204_spi_read_reg_16() - read 2 bytes from a 16-bit register
99 * @indio_dev: iio device associated with child of actual 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
103 **/
104static int adis16204_spi_read_reg_16(struct iio_dev *indio_dev,
105 u8 lower_reg_address,
106 u16 *val)
107{
108 struct spi_message msg;
109 struct adis16204_state *st = iio_dev_get_devdata(indio_dev);
110 int ret;
111 struct spi_transfer xfers[] = {
112 {
113 .tx_buf = st->tx,
114 .bits_per_word = 8,
115 .len = 2,
116 .cs_change = 1,
117 .delay_usecs = 20,
118 }, {
119 .rx_buf = st->rx,
120 .bits_per_word = 8,
121 .len = 2,
122 .delay_usecs = 20,
123 },
124 };
125
126 mutex_lock(&st->buf_lock);
127 st->tx[0] = ADIS16204_READ_REG(lower_reg_address);
128 st->tx[1] = 0;
129
130 spi_message_init(&msg);
131 spi_message_add_tail(&xfers[0], &msg);
132 spi_message_add_tail(&xfers[1], &msg);
133 ret = spi_sync(st->us, &msg);
134 if (ret) {
135 dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
136 lower_reg_address);
137 goto error_ret;
138 }
139 *val = (st->rx[0] << 8) | st->rx[1];
140
141error_ret:
142 mutex_unlock(&st->buf_lock);
143 return ret;
144}
145
146static int adis16204_check_status(struct iio_dev *indio_dev)
147{
148 u16 status;
149 int ret;
150
151 ret = adis16204_spi_read_reg_16(indio_dev,
152 ADIS16204_DIAG_STAT, &status);
153 if (ret < 0) {
154 dev_err(&indio_dev->dev, "Reading status failed\n");
155 goto error_ret;
156 }
157 ret = status & 0x1F;
158
159 if (status & ADIS16204_DIAG_STAT_SELFTEST_FAIL)
160 dev_err(&indio_dev->dev, "Self test failure\n");
161 if (status & ADIS16204_DIAG_STAT_SPI_FAIL)
162 dev_err(&indio_dev->dev, "SPI failure\n");
163 if (status & ADIS16204_DIAG_STAT_FLASH_UPT)
164 dev_err(&indio_dev->dev, "Flash update failed\n");
165 if (status & ADIS16204_DIAG_STAT_POWER_HIGH)
166 dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
167 if (status & ADIS16204_DIAG_STAT_POWER_LOW)
168 dev_err(&indio_dev->dev, "Power supply below 2.975V\n");
169
170error_ret:
171 return ret;
172}
173
174static ssize_t adis16204_read_14bit_signed(struct device *dev,
175 struct device_attribute *attr,
176 char *buf)
177{
178 struct iio_dev *indio_dev = dev_get_drvdata(dev);
179 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
180 s16 val = 0;
181 ssize_t ret;
182
183 mutex_lock(&indio_dev->mlock);
184
185 ret = adis16204_spi_read_reg_16(indio_dev,
186 this_attr->address, (u16 *)&val);
187 if (!ret) {
188 if (val & ADIS16204_ERROR_ACTIVE)
189 adis16204_check_status(indio_dev);
190
191 val = ((s16)(val << 2) >> 2);
192 ret = sprintf(buf, "%d\n", val);
193 }
194
195 mutex_unlock(&indio_dev->mlock);
196
197 return ret;
198}
199
200static int adis16204_reset(struct iio_dev *indio_dev)
201{
202 int ret;
203 ret = adis16204_spi_write_reg_8(indio_dev,
204 ADIS16204_GLOB_CMD,
205 ADIS16204_GLOB_CMD_SW_RESET);
206 if (ret)
207 dev_err(&indio_dev->dev, "problem resetting device");
208
209 return ret;
210}
211
212static ssize_t adis16204_write_reset(struct device *dev,
213 struct device_attribute *attr,
214 const char *buf, size_t len)
215{
216 struct iio_dev *indio_dev = dev_get_drvdata(dev);
217
218 if (len < 1)
219 return -EINVAL;
220 switch (buf[0]) {
221 case '1':
222 case 'y':
223 case 'Y':
224 return adis16204_reset(indio_dev);
225 }
226 return -EINVAL;
227}
228
229int adis16204_set_irq(struct iio_dev *indio_dev, bool enable)
230{
231 int ret = 0;
232 u16 msc;
233
234 ret = adis16204_spi_read_reg_16(indio_dev, ADIS16204_MSC_CTRL, &msc);
235 if (ret)
236 goto error_ret;
237
238 msc |= ADIS16204_MSC_CTRL_ACTIVE_HIGH;
239 msc &= ~ADIS16204_MSC_CTRL_DATA_RDY_DIO2;
240 if (enable)
241 msc |= ADIS16204_MSC_CTRL_DATA_RDY_EN;
242 else
243 msc &= ~ADIS16204_MSC_CTRL_DATA_RDY_EN;
244
245 ret = adis16204_spi_write_reg_16(indio_dev, ADIS16204_MSC_CTRL, msc);
246
247error_ret:
248 return ret;
249}
250
251static int adis16204_self_test(struct iio_dev *indio_dev)
252{
253 int ret;
254 ret = adis16204_spi_write_reg_16(indio_dev,
255 ADIS16204_MSC_CTRL,
256 ADIS16204_MSC_CTRL_SELF_TEST_EN);
257 if (ret) {
258 dev_err(&indio_dev->dev, "problem starting self test");
259 goto err_ret;
260 }
261
262 adis16204_check_status(indio_dev);
263
264err_ret:
265 return ret;
266}
267
268static int adis16204_initial_setup(struct iio_dev *indio_dev)
269{
270 int ret;
271
272 /* Disable IRQ */
273 ret = adis16204_set_irq(indio_dev, false);
274 if (ret) {
275 dev_err(&indio_dev->dev, "disable irq failed");
276 goto err_ret;
277 }
278
279 /* Do self test */
280 ret = adis16204_self_test(indio_dev);
281 if (ret) {
282 dev_err(&indio_dev->dev, "self test failure");
283 goto err_ret;
284 }
285
286 /* Read status register to check the result */
287 ret = adis16204_check_status(indio_dev);
288 if (ret) {
289 adis16204_reset(indio_dev);
290 dev_err(&indio_dev->dev, "device not playing ball -> reset");
291 msleep(ADIS16204_STARTUP_DELAY);
292 ret = adis16204_check_status(indio_dev);
293 if (ret) {
294 dev_err(&indio_dev->dev, "giving up");
295 goto err_ret;
296 }
297 }
298
299err_ret:
300 return ret;
301}
302static IIO_DEV_ATTR_ACCEL_XY(adis16204_read_14bit_signed,
303 ADIS16204_XY_RSS_OUT);
304static IIO_DEV_ATTR_ACCEL_XPEAK(adis16204_read_14bit_signed,
305 ADIS16204_X_PEAK_OUT);
306static IIO_DEV_ATTR_ACCEL_YPEAK(adis16204_read_14bit_signed,
307 ADIS16204_Y_PEAK_OUT);
308static IIO_DEV_ATTR_ACCEL_XYPEAK(adis16204_read_14bit_signed,
309 ADIS16204_XY_PEAK_OUT);
310static IIO_CONST_ATTR(accel_xy_scale, "0.017125");
311
312static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16204_write_reset, 0);
313
314enum adis16204_channel {
315 in_supply,
316 in_aux,
317 temp,
318 accel_x,
319 accel_y,
320};
321
322static u8 adis16204_addresses[5][2] = {
323 [in_supply] = { ADIS16204_SUPPLY_OUT },
324 [in_aux] = { ADIS16204_AUX_ADC },
325 [temp] = { ADIS16204_TEMP_OUT },
326 [accel_x] = { ADIS16204_XACCL_OUT, ADIS16204_XACCL_NULL },
327 [accel_y] = { ADIS16204_XACCL_OUT, ADIS16204_YACCL_NULL },
328};
329static int adis16204_read_raw(struct iio_dev *indio_dev,
330 struct iio_chan_spec const *chan,
331 int *val, int *val2,
332 long mask)
333{
334 int ret;
335 int bits;
336 u8 addr;
337 s16 val16;
338
339 switch (mask) {
340 case 0:
341 mutex_lock(&indio_dev->mlock);
342 addr = adis16204_addresses[chan->address][0];
343 ret = adis16204_spi_read_reg_16(indio_dev, addr, &val16);
344 if (ret)
345 return ret;
346
347 if (val16 & ADIS16204_ERROR_ACTIVE) {
348 ret = adis16204_check_status(indio_dev);
349 if (ret)
350 return ret;
351 }
352 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
353 if (chan->scan_type.sign == 's')
354 val16 = (s16)(val16 <<
355 (16 - chan->scan_type.realbits)) >>
356 (16 - chan->scan_type.realbits);
357 *val = val16;
358 mutex_unlock(&indio_dev->mlock);
359 return IIO_VAL_INT;
360 case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
361 switch (chan->type) {
362 case IIO_IN:
363 *val = 0;
364 if (chan->channel == 0)
365 *val2 = 1220;
366 else
367 *val2 = 610;
368 return IIO_VAL_INT_PLUS_MICRO;
369 case IIO_TEMP:
370 *val = 0;
371 *val2 = -470000;
372 return IIO_VAL_INT_PLUS_MICRO;
373 case IIO_ACCEL:
374 *val = 0;
375 if (chan->channel == 'x')
376 *val2 = 17125;
377 else
378 *val2 = 8407;
379 return IIO_VAL_INT_PLUS_MICRO;
380 default:
381 return -EINVAL;
382 }
383 break;
384 case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
385 *val = 25;
386 return IIO_VAL_INT;
387 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
388 switch (chan->type) {
389 case IIO_ACCEL:
390 bits = 12;
391 break;
392 default:
393 return -EINVAL;
394 };
395 mutex_lock(&indio_dev->mlock);
396 addr = adis16204_addresses[chan->address][1];
397 ret = adis16204_spi_read_reg_16(indio_dev, addr, &val16);
398 if (ret) {
399 mutex_unlock(&indio_dev->mlock);
400 return ret;
401 }
402 val16 &= (1 << bits) - 1;
403 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
404 *val = val16;
405 mutex_unlock(&indio_dev->mlock);
406 return IIO_VAL_INT;
407 }
408 return -EINVAL;
409}
410
411static int adis16204_write_raw(struct iio_dev *indio_dev,
412 struct iio_chan_spec const *chan,
413 int val,
414 int val2,
415 long mask)
416{
417 int bits;
418 s16 val16;
419 u8 addr;
420 switch (mask) {
421 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
422 switch (chan->type) {
423 case IIO_ACCEL:
424 bits = 12;
425 break;
426 default:
427 return -EINVAL;
428 };
429 val16 = val & ((1 << bits) - 1);
430 addr = adis16204_addresses[chan->address][1];
431 return adis16204_spi_write_reg_16(indio_dev, addr, val16);
432 }
433 return -EINVAL;
434}
435
436static struct iio_chan_spec adis16204_channels[] = {
437 IIO_CHAN(IIO_IN, 0, 0, 0, "supply", 0, 0,
438 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
439 in_supply, ADIS16204_SCAN_SUPPLY,
440 IIO_ST('u', 12, 16, 0), 0),
441 IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
442 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
443 in_aux, ADIS16204_SCAN_AUX_ADC,
444 IIO_ST('u', 12, 16, 0), 0),
445 IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0,
446 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
447 (1 << IIO_CHAN_INFO_OFFSET_SEPARATE),
448 temp, ADIS16204_SCAN_TEMP,
449 IIO_ST('u', 12, 16, 0), 0),
450 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X,
451 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
452 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
453 accel_x, ADIS16204_SCAN_ACC_X,
454 IIO_ST('s', 14, 16, 0), 0),
455 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y,
456 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
457 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
458 accel_y, ADIS16204_SCAN_ACC_Y,
459 IIO_ST('s', 14, 16, 0), 0),
460 IIO_CHAN_SOFT_TIMESTAMP(5),
461};
462static struct attribute *adis16204_attributes[] = {
463 &iio_dev_attr_reset.dev_attr.attr,
464 &iio_dev_attr_accel_xy.dev_attr.attr,
465 &iio_dev_attr_accel_xpeak.dev_attr.attr,
466 &iio_dev_attr_accel_ypeak.dev_attr.attr,
467 &iio_dev_attr_accel_xypeak.dev_attr.attr,
468 &iio_const_attr_accel_xy_scale.dev_attr.attr,
469 NULL
470};
471
472static const struct attribute_group adis16204_attribute_group = {
473 .attrs = adis16204_attributes,
474};
475
476static const struct iio_info adis16204_info = {
477 .attrs = &adis16204_attribute_group,
478 .read_raw = &adis16204_read_raw,
479 .write_raw = &adis16204_write_raw,
480 .driver_module = THIS_MODULE,
481};
482
483static int __devinit adis16204_probe(struct spi_device *spi)
484{
485 int ret, regdone = 0;
486 struct adis16204_state *st = kzalloc(sizeof *st, GFP_KERNEL);
487 if (!st) {
488 ret = -ENOMEM;
489 goto error_ret;
490 }
491 /* this is only used for removal purposes */
492 spi_set_drvdata(spi, st);
493
494 /* Allocate the comms buffers */
495 st->rx = kzalloc(sizeof(*st->rx)*ADIS16204_MAX_RX, GFP_KERNEL);
496 if (st->rx == NULL) {
497 ret = -ENOMEM;
498 goto error_free_st;
499 }
500 st->tx = kzalloc(sizeof(*st->tx)*ADIS16204_MAX_TX, GFP_KERNEL);
501 if (st->tx == NULL) {
502 ret = -ENOMEM;
503 goto error_free_rx;
504 }
505 st->us = spi;
506 mutex_init(&st->buf_lock);
507 /* setup the industrialio driver allocated elements */
508 st->indio_dev = iio_allocate_device(0);
509 if (st->indio_dev == NULL) {
510 ret = -ENOMEM;
511 goto error_free_tx;
512 }
513
514 st->indio_dev->name = spi->dev.driver->name;
515 st->indio_dev->dev.parent = &spi->dev;
516 st->indio_dev->info = &adis16204_info;
517 st->indio_dev->channels = adis16204_channels;
518 st->indio_dev->num_channels = ARRAY_SIZE(adis16204_channels);
519 st->indio_dev->dev_data = (void *)(st);
520 st->indio_dev->modes = INDIO_DIRECT_MODE;
521
522 ret = adis16204_configure_ring(st->indio_dev);
523 if (ret)
524 goto error_free_dev;
525
526 ret = iio_device_register(st->indio_dev);
527 if (ret)
528 goto error_unreg_ring_funcs;
529 regdone = 1;
530
531 ret = iio_ring_buffer_register_ex(st->indio_dev->ring, 0,
532 adis16204_channels,
533 ARRAY_SIZE(adis16204_channels));
534 if (ret) {
535 printk(KERN_ERR "failed to initialize the ring\n");
536 goto error_unreg_ring_funcs;
537 }
538
539 if (spi->irq) {
540 ret = adis16204_probe_trigger(st->indio_dev);
541 if (ret)
542 goto error_uninitialize_ring;
543 }
544
545 /* Get the device into a sane initial state */
546 ret = adis16204_initial_setup(st->indio_dev);
547 if (ret)
548 goto error_remove_trigger;
549 return 0;
550
551error_remove_trigger:
552 adis16204_remove_trigger(st->indio_dev);
553error_uninitialize_ring:
554 iio_ring_buffer_unregister(st->indio_dev->ring);
555error_unreg_ring_funcs:
556 adis16204_unconfigure_ring(st->indio_dev);
557error_free_dev:
558 if (regdone)
559 iio_device_unregister(st->indio_dev);
560 else
561 iio_free_device(st->indio_dev);
562error_free_tx:
563 kfree(st->tx);
564error_free_rx:
565 kfree(st->rx);
566error_free_st:
567 kfree(st);
568error_ret:
569 return ret;
570}
571
572static int adis16204_remove(struct spi_device *spi)
573{
574 struct adis16204_state *st = spi_get_drvdata(spi);
575 struct iio_dev *indio_dev = st->indio_dev;
576
577 adis16204_remove_trigger(indio_dev);
578 iio_ring_buffer_unregister(st->indio_dev->ring);
579 iio_device_unregister(indio_dev);
580 adis16204_unconfigure_ring(indio_dev);
581 kfree(st->tx);
582 kfree(st->rx);
583 kfree(st);
584
585 return 0;
586}
587
588static struct spi_driver adis16204_driver = {
589 .driver = {
590 .name = "adis16204",
591 .owner = THIS_MODULE,
592 },
593 .probe = adis16204_probe,
594 .remove = __devexit_p(adis16204_remove),
595};
596
597static __init int adis16204_init(void)
598{
599 return spi_register_driver(&adis16204_driver);
600}
601module_init(adis16204_init);
602
603static __exit void adis16204_exit(void)
604{
605 spi_unregister_driver(&adis16204_driver);
606}
607module_exit(adis16204_exit);
608
609MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
610MODULE_DESCRIPTION("ADIS16204 High-g Digital Impact Sensor and Recorder");
611MODULE_LICENSE("GPL v2");