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/delay.h>
12 #include <linux/mutex.h>
13 #include <linux/device.h>
14 #include <linux/kernel.h>
15 #include <linux/spi/spi.h>
16 #include <linux/slab.h>
17 #include <linux/sysfs.h>
18 #include <linux/list.h>
19 #include <linux/module.h>
20
21 #include "../iio.h"
22 #include "../sysfs.h"
23 #include "../buffer.h"
24
25 #include "adis16204.h"
26
27 #define DRIVER_NAME "adis16204"
28
29 /**
30 * adis16204_spi_write_reg_8() - write single byte to a register
31 * @dev: device associated with child of actual device (iio_dev or iio_trig)
32 * @reg_address: the address of the register to be written
33 * @val: the value to write
34 **/
adis16204_spi_write_reg_8(struct iio_dev * indio_dev,u8 reg_address,u8 val)35 static int adis16204_spi_write_reg_8(struct iio_dev *indio_dev,
36 u8 reg_address,
37 u8 val)
38 {
39 int ret;
40 struct adis16204_state *st = iio_priv(indio_dev);
41
42 mutex_lock(&st->buf_lock);
43 st->tx[0] = ADIS16204_WRITE_REG(reg_address);
44 st->tx[1] = val;
45
46 ret = spi_write(st->us, st->tx, 2);
47 mutex_unlock(&st->buf_lock);
48
49 return ret;
50 }
51
52 /**
53 * adis16204_spi_write_reg_16() - write 2 bytes to a pair of registers
54 * @indio_dev: iio device associated with child of actual device
55 * @reg_address: the address of the lower of the two registers. Second register
56 * is assumed to have address one greater.
57 * @val: value to be written
58 **/
adis16204_spi_write_reg_16(struct iio_dev * indio_dev,u8 lower_reg_address,u16 value)59 static int adis16204_spi_write_reg_16(struct iio_dev *indio_dev,
60 u8 lower_reg_address,
61 u16 value)
62 {
63 int ret;
64 struct spi_message msg;
65 struct adis16204_state *st = iio_priv(indio_dev);
66 struct spi_transfer xfers[] = {
67 {
68 .tx_buf = st->tx,
69 .bits_per_word = 8,
70 .len = 2,
71 .cs_change = 1,
72 }, {
73 .tx_buf = st->tx + 2,
74 .bits_per_word = 8,
75 .len = 2,
76 .cs_change = 1,
77 },
78 };
79
80 mutex_lock(&st->buf_lock);
81 st->tx[0] = ADIS16204_WRITE_REG(lower_reg_address);
82 st->tx[1] = value & 0xFF;
83 st->tx[2] = ADIS16204_WRITE_REG(lower_reg_address + 1);
84 st->tx[3] = (value >> 8) & 0xFF;
85
86 spi_message_init(&msg);
87 spi_message_add_tail(&xfers[0], &msg);
88 spi_message_add_tail(&xfers[1], &msg);
89 ret = spi_sync(st->us, &msg);
90 mutex_unlock(&st->buf_lock);
91
92 return ret;
93 }
94
95 /**
96 * adis16204_spi_read_reg_16() - read 2 bytes from a 16-bit register
97 * @indio_dev: iio device associated with child of actual device
98 * @reg_address: the address of the lower of the two registers. Second register
99 * is assumed to have address one greater.
100 * @val: somewhere to pass back the value read
101 **/
adis16204_spi_read_reg_16(struct iio_dev * indio_dev,u8 lower_reg_address,u16 * val)102 static int adis16204_spi_read_reg_16(struct iio_dev *indio_dev,
103 u8 lower_reg_address,
104 u16 *val)
105 {
106 struct spi_message msg;
107 struct adis16204_state *st = iio_priv(indio_dev);
108 int ret;
109 struct spi_transfer xfers[] = {
110 {
111 .tx_buf = st->tx,
112 .bits_per_word = 8,
113 .len = 2,
114 .cs_change = 1,
115 .delay_usecs = 20,
116 }, {
117 .rx_buf = st->rx,
118 .bits_per_word = 8,
119 .len = 2,
120 .delay_usecs = 20,
121 },
122 };
123
124 mutex_lock(&st->buf_lock);
125 st->tx[0] = ADIS16204_READ_REG(lower_reg_address);
126 st->tx[1] = 0;
127
128 spi_message_init(&msg);
129 spi_message_add_tail(&xfers[0], &msg);
130 spi_message_add_tail(&xfers[1], &msg);
131 ret = spi_sync(st->us, &msg);
132 if (ret) {
133 dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
134 lower_reg_address);
135 goto error_ret;
136 }
137 *val = (st->rx[0] << 8) | st->rx[1];
138
139 error_ret:
140 mutex_unlock(&st->buf_lock);
141 return ret;
142 }
143
adis16204_check_status(struct iio_dev * indio_dev)144 static int adis16204_check_status(struct iio_dev *indio_dev)
145 {
146 u16 status;
147 int ret;
148
149 ret = adis16204_spi_read_reg_16(indio_dev,
150 ADIS16204_DIAG_STAT, &status);
151 if (ret < 0) {
152 dev_err(&indio_dev->dev, "Reading status failed\n");
153 goto error_ret;
154 }
155 ret = status & 0x1F;
156
157 if (status & ADIS16204_DIAG_STAT_SELFTEST_FAIL)
158 dev_err(&indio_dev->dev, "Self test failure\n");
159 if (status & ADIS16204_DIAG_STAT_SPI_FAIL)
160 dev_err(&indio_dev->dev, "SPI failure\n");
161 if (status & ADIS16204_DIAG_STAT_FLASH_UPT)
162 dev_err(&indio_dev->dev, "Flash update failed\n");
163 if (status & ADIS16204_DIAG_STAT_POWER_HIGH)
164 dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
165 if (status & ADIS16204_DIAG_STAT_POWER_LOW)
166 dev_err(&indio_dev->dev, "Power supply below 2.975V\n");
167
168 error_ret:
169 return ret;
170 }
171
adis16204_read_14bit_signed(struct device * dev,struct device_attribute * attr,char * buf)172 static ssize_t adis16204_read_14bit_signed(struct device *dev,
173 struct device_attribute *attr,
174 char *buf)
175 {
176 struct iio_dev *indio_dev = dev_get_drvdata(dev);
177 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
178 s16 val = 0;
179 ssize_t ret;
180
181 mutex_lock(&indio_dev->mlock);
182
183 ret = adis16204_spi_read_reg_16(indio_dev,
184 this_attr->address, (u16 *)&val);
185 if (!ret) {
186 if (val & ADIS16204_ERROR_ACTIVE)
187 adis16204_check_status(indio_dev);
188
189 val = ((s16)(val << 2) >> 2);
190 ret = sprintf(buf, "%d\n", val);
191 }
192
193 mutex_unlock(&indio_dev->mlock);
194
195 return ret;
196 }
197
adis16204_reset(struct iio_dev * indio_dev)198 static int adis16204_reset(struct iio_dev *indio_dev)
199 {
200 int ret;
201 ret = adis16204_spi_write_reg_8(indio_dev,
202 ADIS16204_GLOB_CMD,
203 ADIS16204_GLOB_CMD_SW_RESET);
204 if (ret)
205 dev_err(&indio_dev->dev, "problem resetting device");
206
207 return ret;
208 }
209
adis16204_write_reset(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)210 static ssize_t adis16204_write_reset(struct device *dev,
211 struct device_attribute *attr,
212 const char *buf, size_t len)
213 {
214 struct iio_dev *indio_dev = dev_get_drvdata(dev);
215
216 if (len < 1)
217 return -EINVAL;
218 switch (buf[0]) {
219 case '1':
220 case 'y':
221 case 'Y':
222 return adis16204_reset(indio_dev);
223 }
224 return -EINVAL;
225 }
226
adis16204_set_irq(struct iio_dev * indio_dev,bool enable)227 int adis16204_set_irq(struct iio_dev *indio_dev, bool enable)
228 {
229 int ret = 0;
230 u16 msc;
231
232 ret = adis16204_spi_read_reg_16(indio_dev, ADIS16204_MSC_CTRL, &msc);
233 if (ret)
234 goto error_ret;
235
236 msc |= ADIS16204_MSC_CTRL_ACTIVE_HIGH;
237 msc &= ~ADIS16204_MSC_CTRL_DATA_RDY_DIO2;
238 if (enable)
239 msc |= ADIS16204_MSC_CTRL_DATA_RDY_EN;
240 else
241 msc &= ~ADIS16204_MSC_CTRL_DATA_RDY_EN;
242
243 ret = adis16204_spi_write_reg_16(indio_dev, ADIS16204_MSC_CTRL, msc);
244
245 error_ret:
246 return ret;
247 }
248
adis16204_self_test(struct iio_dev * indio_dev)249 static int adis16204_self_test(struct iio_dev *indio_dev)
250 {
251 int ret;
252 ret = adis16204_spi_write_reg_16(indio_dev,
253 ADIS16204_MSC_CTRL,
254 ADIS16204_MSC_CTRL_SELF_TEST_EN);
255 if (ret) {
256 dev_err(&indio_dev->dev, "problem starting self test");
257 goto err_ret;
258 }
259
260 adis16204_check_status(indio_dev);
261
262 err_ret:
263 return ret;
264 }
265
adis16204_initial_setup(struct iio_dev * indio_dev)266 static int adis16204_initial_setup(struct iio_dev *indio_dev)
267 {
268 int ret;
269
270 /* Disable IRQ */
271 ret = adis16204_set_irq(indio_dev, false);
272 if (ret) {
273 dev_err(&indio_dev->dev, "disable irq failed");
274 goto err_ret;
275 }
276
277 /* Do self test */
278 ret = adis16204_self_test(indio_dev);
279 if (ret) {
280 dev_err(&indio_dev->dev, "self test failure");
281 goto err_ret;
282 }
283
284 /* Read status register to check the result */
285 ret = adis16204_check_status(indio_dev);
286 if (ret) {
287 adis16204_reset(indio_dev);
288 dev_err(&indio_dev->dev, "device not playing ball -> reset");
289 msleep(ADIS16204_STARTUP_DELAY);
290 ret = adis16204_check_status(indio_dev);
291 if (ret) {
292 dev_err(&indio_dev->dev, "giving up");
293 goto err_ret;
294 }
295 }
296
297 err_ret:
298 return ret;
299 }
300
301 /* Unique to this driver currently */
302 #define IIO_DEV_ATTR_ACCEL_XY(_show, _addr) \
303 IIO_DEVICE_ATTR(in_accel_xy, S_IRUGO, _show, NULL, _addr)
304 #define IIO_DEV_ATTR_ACCEL_XYPEAK(_show, _addr) \
305 IIO_DEVICE_ATTR(in_accel_xypeak, S_IRUGO, _show, NULL, _addr)
306
307 static IIO_DEV_ATTR_ACCEL_XY(adis16204_read_14bit_signed,
308 ADIS16204_XY_RSS_OUT);
309 static IIO_DEV_ATTR_ACCEL_XYPEAK(adis16204_read_14bit_signed,
310 ADIS16204_XY_PEAK_OUT);
311 static IIO_CONST_ATTR(in_accel_xy_scale, "0.017125");
312
313 static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16204_write_reset, 0);
314
315 enum adis16204_channel {
316 in_supply,
317 in_aux,
318 temp,
319 accel_x,
320 accel_y,
321 };
322
323 static u8 adis16204_addresses[5][3] = {
324 [in_supply] = { ADIS16204_SUPPLY_OUT },
325 [in_aux] = { ADIS16204_AUX_ADC },
326 [temp] = { ADIS16204_TEMP_OUT },
327 [accel_x] = { ADIS16204_XACCL_OUT, ADIS16204_XACCL_NULL,
328 ADIS16204_X_PEAK_OUT },
329 [accel_y] = { ADIS16204_XACCL_OUT, ADIS16204_YACCL_NULL,
330 ADIS16204_Y_PEAK_OUT },
331 };
332
adis16204_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)333 static int adis16204_read_raw(struct iio_dev *indio_dev,
334 struct iio_chan_spec const *chan,
335 int *val, int *val2,
336 long mask)
337 {
338 int ret;
339 int bits;
340 u8 addr;
341 s16 val16;
342 int addrind;
343
344 switch (mask) {
345 case 0:
346 mutex_lock(&indio_dev->mlock);
347 addr = adis16204_addresses[chan->address][0];
348 ret = adis16204_spi_read_reg_16(indio_dev, addr, &val16);
349 if (ret) {
350 mutex_unlock(&indio_dev->mlock);
351 return ret;
352 }
353
354 if (val16 & ADIS16204_ERROR_ACTIVE) {
355 ret = adis16204_check_status(indio_dev);
356 if (ret) {
357 mutex_unlock(&indio_dev->mlock);
358 return ret;
359 }
360 }
361 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
362 if (chan->scan_type.sign == 's')
363 val16 = (s16)(val16 <<
364 (16 - chan->scan_type.realbits)) >>
365 (16 - chan->scan_type.realbits);
366 *val = val16;
367 mutex_unlock(&indio_dev->mlock);
368 return IIO_VAL_INT;
369 case IIO_CHAN_INFO_SCALE:
370 switch (chan->type) {
371 case IIO_VOLTAGE:
372 *val = 0;
373 if (chan->channel == 0)
374 *val2 = 1220;
375 else
376 *val2 = 610;
377 return IIO_VAL_INT_PLUS_MICRO;
378 case IIO_TEMP:
379 *val = 0;
380 *val2 = -470000;
381 return IIO_VAL_INT_PLUS_MICRO;
382 case IIO_ACCEL:
383 *val = 0;
384 if (chan->channel == 'x')
385 *val2 = 17125;
386 else
387 *val2 = 8407;
388 return IIO_VAL_INT_PLUS_MICRO;
389 default:
390 return -EINVAL;
391 }
392 break;
393 case IIO_CHAN_INFO_OFFSET:
394 *val = 25;
395 return IIO_VAL_INT;
396 case IIO_CHAN_INFO_CALIBBIAS:
397 case IIO_CHAN_INFO_PEAK:
398 if (mask == IIO_CHAN_INFO_CALIBBIAS) {
399 bits = 12;
400 addrind = 1;
401 } else { /* PEAK_SEPARATE */
402 bits = 14;
403 addrind = 2;
404 }
405 mutex_lock(&indio_dev->mlock);
406 addr = adis16204_addresses[chan->address][addrind];
407 ret = adis16204_spi_read_reg_16(indio_dev, addr, &val16);
408 if (ret) {
409 mutex_unlock(&indio_dev->mlock);
410 return ret;
411 }
412 val16 &= (1 << bits) - 1;
413 val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
414 *val = val16;
415 mutex_unlock(&indio_dev->mlock);
416 return IIO_VAL_INT;
417 }
418 return -EINVAL;
419 }
420
adis16204_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)421 static int adis16204_write_raw(struct iio_dev *indio_dev,
422 struct iio_chan_spec const *chan,
423 int val,
424 int val2,
425 long mask)
426 {
427 int bits;
428 s16 val16;
429 u8 addr;
430 switch (mask) {
431 case IIO_CHAN_INFO_CALIBBIAS:
432 switch (chan->type) {
433 case IIO_ACCEL:
434 bits = 12;
435 break;
436 default:
437 return -EINVAL;
438 };
439 val16 = val & ((1 << bits) - 1);
440 addr = adis16204_addresses[chan->address][1];
441 return adis16204_spi_write_reg_16(indio_dev, addr, val16);
442 }
443 return -EINVAL;
444 }
445
446 static struct iio_chan_spec adis16204_channels[] = {
447 IIO_CHAN(IIO_VOLTAGE, 0, 0, 0, "supply", 0, 0,
448 IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
449 in_supply, ADIS16204_SCAN_SUPPLY,
450 IIO_ST('u', 12, 16, 0), 0),
451 IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, NULL, 1, 0,
452 IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
453 in_aux, ADIS16204_SCAN_AUX_ADC,
454 IIO_ST('u', 12, 16, 0), 0),
455 IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0,
456 IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
457 IIO_CHAN_INFO_OFFSET_SEPARATE_BIT,
458 temp, ADIS16204_SCAN_TEMP,
459 IIO_ST('u', 12, 16, 0), 0),
460 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X,
461 IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
462 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
463 IIO_CHAN_INFO_PEAK_SEPARATE_BIT,
464 accel_x, ADIS16204_SCAN_ACC_X,
465 IIO_ST('s', 14, 16, 0), 0),
466 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y,
467 IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
468 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT |
469 IIO_CHAN_INFO_PEAK_SEPARATE_BIT,
470 accel_y, ADIS16204_SCAN_ACC_Y,
471 IIO_ST('s', 14, 16, 0), 0),
472 IIO_CHAN_SOFT_TIMESTAMP(5),
473 };
474
475 static struct attribute *adis16204_attributes[] = {
476 &iio_dev_attr_reset.dev_attr.attr,
477 &iio_dev_attr_in_accel_xy.dev_attr.attr,
478 &iio_dev_attr_in_accel_xypeak.dev_attr.attr,
479 &iio_const_attr_in_accel_xy_scale.dev_attr.attr,
480 NULL
481 };
482
483 static const struct attribute_group adis16204_attribute_group = {
484 .attrs = adis16204_attributes,
485 };
486
487 static const struct iio_info adis16204_info = {
488 .attrs = &adis16204_attribute_group,
489 .read_raw = &adis16204_read_raw,
490 .write_raw = &adis16204_write_raw,
491 .driver_module = THIS_MODULE,
492 };
493
adis16204_probe(struct spi_device * spi)494 static int __devinit adis16204_probe(struct spi_device *spi)
495 {
496 int ret;
497 struct adis16204_state *st;
498 struct iio_dev *indio_dev;
499
500 /* setup the industrialio driver allocated elements */
501 indio_dev = iio_allocate_device(sizeof(*st));
502 if (indio_dev == NULL) {
503 ret = -ENOMEM;
504 goto error_ret;
505 }
506 st = iio_priv(indio_dev);
507 /* this is only used for removal purposes */
508 spi_set_drvdata(spi, indio_dev);
509 st->us = spi;
510 mutex_init(&st->buf_lock);
511
512 indio_dev->name = spi->dev.driver->name;
513 indio_dev->dev.parent = &spi->dev;
514 indio_dev->info = &adis16204_info;
515 indio_dev->channels = adis16204_channels;
516 indio_dev->num_channels = ARRAY_SIZE(adis16204_channels);
517 indio_dev->modes = INDIO_DIRECT_MODE;
518
519 ret = adis16204_configure_ring(indio_dev);
520 if (ret)
521 goto error_free_dev;
522
523 ret = iio_buffer_register(indio_dev,
524 adis16204_channels,
525 ARRAY_SIZE(adis16204_channels));
526 if (ret) {
527 printk(KERN_ERR "failed to initialize the ring\n");
528 goto error_unreg_ring_funcs;
529 }
530
531 if (spi->irq) {
532 ret = adis16204_probe_trigger(indio_dev);
533 if (ret)
534 goto error_uninitialize_ring;
535 }
536
537 /* Get the device into a sane initial state */
538 ret = adis16204_initial_setup(indio_dev);
539 if (ret)
540 goto error_remove_trigger;
541 ret = iio_device_register(indio_dev);
542 if (ret)
543 goto error_remove_trigger;
544
545 return 0;
546
547 error_remove_trigger:
548 adis16204_remove_trigger(indio_dev);
549 error_uninitialize_ring:
550 iio_buffer_unregister(indio_dev);
551 error_unreg_ring_funcs:
552 adis16204_unconfigure_ring(indio_dev);
553 error_free_dev:
554 iio_free_device(indio_dev);
555 error_ret:
556 return ret;
557 }
558
adis16204_remove(struct spi_device * spi)559 static int adis16204_remove(struct spi_device *spi)
560 {
561 struct iio_dev *indio_dev = spi_get_drvdata(spi);
562
563 iio_device_unregister(indio_dev);
564 adis16204_remove_trigger(indio_dev);
565 iio_buffer_unregister(indio_dev);
566 adis16204_unconfigure_ring(indio_dev);
567 iio_free_device(indio_dev);
568
569 return 0;
570 }
571
572 static struct spi_driver adis16204_driver = {
573 .driver = {
574 .name = "adis16204",
575 .owner = THIS_MODULE,
576 },
577 .probe = adis16204_probe,
578 .remove = __devexit_p(adis16204_remove),
579 };
580 module_spi_driver(adis16204_driver);
581
582 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
583 MODULE_DESCRIPTION("ADIS16204 High-g Digital Impact Sensor and Recorder");
584 MODULE_LICENSE("GPL v2");
585 MODULE_ALIAS("spi:adis16204");
586