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Merge branch 'nfs-for-3.1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
[deliverable/linux.git] / drivers / staging / iio / accel / sca3000_core.c
1 /*
2 * sca3000_core.c -- support VTI sca3000 series accelerometers via SPI
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published by
6 * the Free Software Foundation.
7 *
8 * Copyright (c) 2009 Jonathan Cameron <jic23@cam.ac.uk>
9 *
10 * See industrialio/accels/sca3000.h for comments.
11 */
12
13 #include <linux/interrupt.h>
14 #include <linux/gpio.h>
15 #include <linux/fs.h>
16 #include <linux/device.h>
17 #include <linux/slab.h>
18 #include <linux/kernel.h>
19 #include <linux/spi/spi.h>
20 #include <linux/sysfs.h>
21 #include "../iio.h"
22 #include "../sysfs.h"
23 #include "../ring_generic.h"
24
25 #include "accel.h"
26 #include "sca3000.h"
27
28 enum sca3000_variant {
29 d01,
30 e02,
31 e04,
32 e05,
33 };
34
35 /* Note where option modes are not defined, the chip simply does not
36 * support any.
37 * Other chips in the sca3000 series use i2c and are not included here.
38 *
39 * Some of these devices are only listed in the family data sheet and
40 * do not actually appear to be available.
41 */
42 static const struct sca3000_chip_info sca3000_spi_chip_info_tbl[] = {
43 [d01] = {
44 .scale = 7357,
45 .temp_output = true,
46 .measurement_mode_freq = 250,
47 .option_mode_1 = SCA3000_OP_MODE_BYPASS,
48 .option_mode_1_freq = 250,
49 .mot_det_mult_xz = {50, 100, 200, 350, 650, 1300},
50 .mot_det_mult_y = {50, 100, 150, 250, 450, 850, 1750},
51 },
52 [e02] = {
53 .scale = 9810,
54 .measurement_mode_freq = 125,
55 .option_mode_1 = SCA3000_OP_MODE_NARROW,
56 .option_mode_1_freq = 63,
57 .mot_det_mult_xz = {100, 150, 300, 550, 1050, 2050},
58 .mot_det_mult_y = {50, 100, 200, 350, 700, 1350, 2700},
59 },
60 [e04] = {
61 .scale = 19620,
62 .measurement_mode_freq = 100,
63 .option_mode_1 = SCA3000_OP_MODE_NARROW,
64 .option_mode_1_freq = 50,
65 .option_mode_2 = SCA3000_OP_MODE_WIDE,
66 .option_mode_2_freq = 400,
67 .mot_det_mult_xz = {200, 300, 600, 1100, 2100, 4100},
68 .mot_det_mult_y = {100, 200, 400, 7000, 1400, 2700, 54000},
69 },
70 [e05] = {
71 .scale = 61313,
72 .measurement_mode_freq = 200,
73 .option_mode_1 = SCA3000_OP_MODE_NARROW,
74 .option_mode_1_freq = 50,
75 .option_mode_2 = SCA3000_OP_MODE_WIDE,
76 .option_mode_2_freq = 400,
77 .mot_det_mult_xz = {600, 900, 1700, 3200, 6100, 11900},
78 .mot_det_mult_y = {300, 600, 1200, 2000, 4100, 7800, 15600},
79 },
80 };
81
82 int sca3000_write_reg(struct sca3000_state *st, u8 address, u8 val)
83 {
84 st->tx[0] = SCA3000_WRITE_REG(address);
85 st->tx[1] = val;
86 return spi_write(st->us, st->tx, 2);
87 }
88
89 int sca3000_read_data_short(struct sca3000_state *st,
90 uint8_t reg_address_high,
91 int len)
92 {
93 struct spi_message msg;
94 struct spi_transfer xfer[2] = {
95 {
96 .len = 1,
97 .tx_buf = st->tx,
98 }, {
99 .len = len,
100 .rx_buf = st->rx,
101 }
102 };
103 st->tx[0] = SCA3000_READ_REG(reg_address_high);
104 spi_message_init(&msg);
105 spi_message_add_tail(&xfer[0], &msg);
106 spi_message_add_tail(&xfer[1], &msg);
107
108 return spi_sync(st->us, &msg);
109 }
110
111 /**
112 * sca3000_reg_lock_on() test if the ctrl register lock is on
113 *
114 * Lock must be held.
115 **/
116 static int sca3000_reg_lock_on(struct sca3000_state *st)
117 {
118 int ret;
119
120 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1);
121 if (ret < 0)
122 return ret;
123
124 return !(st->rx[0] & SCA3000_LOCKED);
125 }
126
127 /**
128 * __sca3000_unlock_reg_lock() unlock the control registers
129 *
130 * Note the device does not appear to support doing this in a single transfer.
131 * This should only ever be used as part of ctrl reg read.
132 * Lock must be held before calling this
133 **/
134 static int __sca3000_unlock_reg_lock(struct sca3000_state *st)
135 {
136 struct spi_message msg;
137 struct spi_transfer xfer[3] = {
138 {
139 .len = 2,
140 .cs_change = 1,
141 .tx_buf = st->tx,
142 }, {
143 .len = 2,
144 .cs_change = 1,
145 .tx_buf = st->tx + 2,
146 }, {
147 .len = 2,
148 .tx_buf = st->tx + 4,
149 },
150 };
151 st->tx[0] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK);
152 st->tx[1] = 0x00;
153 st->tx[2] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK);
154 st->tx[3] = 0x50;
155 st->tx[4] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK);
156 st->tx[5] = 0xA0;
157 spi_message_init(&msg);
158 spi_message_add_tail(&xfer[0], &msg);
159 spi_message_add_tail(&xfer[1], &msg);
160 spi_message_add_tail(&xfer[2], &msg);
161
162 return spi_sync(st->us, &msg);
163 }
164
165 /**
166 * sca3000_write_ctrl_reg() write to a lock protect ctrl register
167 * @sel: selects which registers we wish to write to
168 * @val: the value to be written
169 *
170 * Certain control registers are protected against overwriting by the lock
171 * register and use a shared write address. This function allows writing of
172 * these registers.
173 * Lock must be held.
174 **/
175 static int sca3000_write_ctrl_reg(struct sca3000_state *st,
176 uint8_t sel,
177 uint8_t val)
178 {
179
180 int ret;
181
182 ret = sca3000_reg_lock_on(st);
183 if (ret < 0)
184 goto error_ret;
185 if (ret) {
186 ret = __sca3000_unlock_reg_lock(st);
187 if (ret)
188 goto error_ret;
189 }
190
191 /* Set the control select register */
192 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, sel);
193 if (ret)
194 goto error_ret;
195
196 /* Write the actual value into the register */
197 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_DATA, val);
198
199 error_ret:
200 return ret;
201 }
202
203 /* Crucial that lock is called before calling this */
204 /**
205 * sca3000_read_ctrl_reg() read from lock protected control register.
206 *
207 * Lock must be held.
208 **/
209 static int sca3000_read_ctrl_reg(struct sca3000_state *st,
210 u8 ctrl_reg)
211 {
212 int ret;
213
214 ret = sca3000_reg_lock_on(st);
215 if (ret < 0)
216 goto error_ret;
217 if (ret) {
218 ret = __sca3000_unlock_reg_lock(st);
219 if (ret)
220 goto error_ret;
221 }
222 /* Set the control select register */
223 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, ctrl_reg);
224 if (ret)
225 goto error_ret;
226 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_CTRL_DATA, 1);
227 if (ret)
228 goto error_ret;
229 else
230 return st->rx[0];
231 error_ret:
232 return ret;
233 }
234
235 #ifdef SCA3000_DEBUG
236 /**
237 * sca3000_check_status() check the status register
238 *
239 * Only used for debugging purposes
240 **/
241 static int sca3000_check_status(struct device *dev)
242 {
243 int ret;
244 struct iio_dev *indio_dev = dev_get_drvdata(dev);
245 struct sca3000_state *st = iio_priv(indio_dev);
246
247 mutex_lock(&st->lock);
248 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1);
249 if (ret < 0)
250 goto error_ret;
251 if (st->rx[0] & SCA3000_EEPROM_CS_ERROR)
252 dev_err(dev, "eeprom error\n");
253 if (st->rx[0] & SCA3000_SPI_FRAME_ERROR)
254 dev_err(dev, "Previous SPI Frame was corrupt\n");
255
256 error_ret:
257 mutex_unlock(&st->lock);
258 return ret;
259 }
260 #endif /* SCA3000_DEBUG */
261
262
263 /**
264 * sca3000_show_reg() - sysfs interface to read the chip revision number
265 **/
266 static ssize_t sca3000_show_rev(struct device *dev,
267 struct device_attribute *attr,
268 char *buf)
269 {
270 int len = 0, ret;
271 struct iio_dev *dev_info = dev_get_drvdata(dev);
272 struct sca3000_state *st = iio_priv(dev_info);
273
274 mutex_lock(&st->lock);
275 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_REVID, 1);
276 if (ret < 0)
277 goto error_ret;
278 len += sprintf(buf + len,
279 "major=%d, minor=%d\n",
280 st->rx[0] & SCA3000_REVID_MAJOR_MASK,
281 st->rx[0] & SCA3000_REVID_MINOR_MASK);
282 error_ret:
283 mutex_unlock(&st->lock);
284
285 return ret ? ret : len;
286 }
287
288 /**
289 * sca3000_show_available_measurement_modes() display available modes
290 *
291 * This is all read from chip specific data in the driver. Not all
292 * of the sca3000 series support modes other than normal.
293 **/
294 static ssize_t
295 sca3000_show_available_measurement_modes(struct device *dev,
296 struct device_attribute *attr,
297 char *buf)
298 {
299 struct iio_dev *dev_info = dev_get_drvdata(dev);
300 struct sca3000_state *st = iio_priv(dev_info);
301 int len = 0;
302
303 len += sprintf(buf + len, "0 - normal mode");
304 switch (st->info->option_mode_1) {
305 case SCA3000_OP_MODE_NARROW:
306 len += sprintf(buf + len, ", 1 - narrow mode");
307 break;
308 case SCA3000_OP_MODE_BYPASS:
309 len += sprintf(buf + len, ", 1 - bypass mode");
310 break;
311 }
312 switch (st->info->option_mode_2) {
313 case SCA3000_OP_MODE_WIDE:
314 len += sprintf(buf + len, ", 2 - wide mode");
315 break;
316 }
317 /* always supported */
318 len += sprintf(buf + len, " 3 - motion detection\n");
319
320 return len;
321 }
322
323 /**
324 * sca3000_show_measurmenet_mode() sysfs read of current mode
325 **/
326 static ssize_t
327 sca3000_show_measurement_mode(struct device *dev,
328 struct device_attribute *attr,
329 char *buf)
330 {
331 struct iio_dev *dev_info = dev_get_drvdata(dev);
332 struct sca3000_state *st = iio_priv(dev_info);
333 int len = 0, ret;
334
335 mutex_lock(&st->lock);
336 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
337 if (ret)
338 goto error_ret;
339 /* mask bottom 2 bits - only ones that are relevant */
340 st->rx[0] &= 0x03;
341 switch (st->rx[0]) {
342 case SCA3000_MEAS_MODE_NORMAL:
343 len += sprintf(buf + len, "0 - normal mode\n");
344 break;
345 case SCA3000_MEAS_MODE_MOT_DET:
346 len += sprintf(buf + len, "3 - motion detection\n");
347 break;
348 case SCA3000_MEAS_MODE_OP_1:
349 switch (st->info->option_mode_1) {
350 case SCA3000_OP_MODE_NARROW:
351 len += sprintf(buf + len, "1 - narrow mode\n");
352 break;
353 case SCA3000_OP_MODE_BYPASS:
354 len += sprintf(buf + len, "1 - bypass mode\n");
355 break;
356 }
357 break;
358 case SCA3000_MEAS_MODE_OP_2:
359 switch (st->info->option_mode_2) {
360 case SCA3000_OP_MODE_WIDE:
361 len += sprintf(buf + len, "2 - wide mode\n");
362 break;
363 }
364 break;
365 }
366
367 error_ret:
368 mutex_unlock(&st->lock);
369
370 return ret ? ret : len;
371 }
372
373 /**
374 * sca3000_store_measurement_mode() set the current mode
375 **/
376 static ssize_t
377 sca3000_store_measurement_mode(struct device *dev,
378 struct device_attribute *attr,
379 const char *buf,
380 size_t len)
381 {
382 struct iio_dev *dev_info = dev_get_drvdata(dev);
383 struct sca3000_state *st = iio_priv(dev_info);
384 int ret;
385 int mask = 0x03;
386 long val;
387
388 mutex_lock(&st->lock);
389 ret = strict_strtol(buf, 10, &val);
390 if (ret)
391 goto error_ret;
392 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
393 if (ret)
394 goto error_ret;
395 st->rx[0] &= ~mask;
396 st->rx[0] |= (val & mask);
397 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, st->rx[0]);
398 if (ret)
399 goto error_ret;
400 mutex_unlock(&st->lock);
401
402 return len;
403
404 error_ret:
405 mutex_unlock(&st->lock);
406
407 return ret;
408 }
409
410
411 /* Not even vaguely standard attributes so defined here rather than
412 * in the relevant IIO core headers
413 */
414 static IIO_DEVICE_ATTR(measurement_mode_available, S_IRUGO,
415 sca3000_show_available_measurement_modes,
416 NULL, 0);
417
418 static IIO_DEVICE_ATTR(measurement_mode, S_IRUGO | S_IWUSR,
419 sca3000_show_measurement_mode,
420 sca3000_store_measurement_mode,
421 0);
422
423 /* More standard attributes */
424
425 static IIO_DEV_ATTR_REV(sca3000_show_rev);
426
427 #define SCA3000_INFO_MASK \
428 (1 << IIO_CHAN_INFO_SCALE_SHARED)
429 #define SCA3000_EVENT_MASK \
430 (IIO_EV_BIT(IIO_EV_TYPE_MAG, IIO_EV_DIR_RISING))
431
432 static struct iio_chan_spec sca3000_channels[] = {
433 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X, SCA3000_INFO_MASK,
434 0, 0, IIO_ST('s', 11, 16, 5), SCA3000_EVENT_MASK),
435 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y, SCA3000_INFO_MASK,
436 1, 1, IIO_ST('s', 11, 16, 5), SCA3000_EVENT_MASK),
437 IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Z, SCA3000_INFO_MASK,
438 2, 2, IIO_ST('s', 11, 16, 5), SCA3000_EVENT_MASK),
439 };
440
441 static u8 sca3000_addresses[3][3] = {
442 [0] = {SCA3000_REG_ADDR_X_MSB, SCA3000_REG_CTRL_SEL_MD_X_TH,
443 SCA3000_MD_CTRL_OR_X},
444 [1] = {SCA3000_REG_ADDR_Y_MSB, SCA3000_REG_CTRL_SEL_MD_Y_TH,
445 SCA3000_MD_CTRL_OR_Y},
446 [2] = {SCA3000_REG_ADDR_Z_MSB, SCA3000_REG_CTRL_SEL_MD_Z_TH,
447 SCA3000_MD_CTRL_OR_Z},
448 };
449
450 static int sca3000_read_raw(struct iio_dev *indio_dev,
451 struct iio_chan_spec const *chan,
452 int *val,
453 int *val2,
454 long mask)
455 {
456 struct sca3000_state *st = iio_priv(indio_dev);
457 int ret;
458 u8 address;
459
460 switch (mask) {
461 case 0:
462 mutex_lock(&st->lock);
463 if (st->mo_det_use_count) {
464 mutex_unlock(&st->lock);
465 return -EBUSY;
466 }
467 address = sca3000_addresses[chan->address][0];
468 ret = sca3000_read_data_short(st, address, 2);
469 if (ret < 0) {
470 mutex_unlock(&st->lock);
471 return ret;
472 }
473 *val = (be16_to_cpup((__be16 *)st->rx) >> 3) & 0x1FFF;
474 *val = ((*val) << (sizeof(*val)*8 - 13)) >>
475 (sizeof(*val)*8 - 13);
476 mutex_unlock(&st->lock);
477 return IIO_VAL_INT;
478 case (1 << IIO_CHAN_INFO_SCALE_SHARED):
479 *val = 0;
480 if (chan->type == IIO_ACCEL)
481 *val2 = st->info->scale;
482 else /* temperature */
483 *val2 = 555556;
484 return IIO_VAL_INT_PLUS_MICRO;
485 default:
486 return -EINVAL;
487 }
488 }
489
490 /**
491 * sca3000_read_av_freq() sysfs function to get available frequencies
492 *
493 * The later modes are only relevant to the ring buffer - and depend on current
494 * mode. Note that data sheet gives rather wide tolerances for these so integer
495 * division will give good enough answer and not all chips have them specified
496 * at all.
497 **/
498 static ssize_t sca3000_read_av_freq(struct device *dev,
499 struct device_attribute *attr,
500 char *buf)
501 {
502 struct iio_dev *indio_dev = dev_get_drvdata(dev);
503 struct sca3000_state *st = iio_priv(indio_dev);
504 int len = 0, ret, val;
505
506 mutex_lock(&st->lock);
507 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
508 val = st->rx[0];
509 mutex_unlock(&st->lock);
510 if (ret)
511 goto error_ret;
512
513 switch (val & 0x03) {
514 case SCA3000_MEAS_MODE_NORMAL:
515 len += sprintf(buf + len, "%d %d %d\n",
516 st->info->measurement_mode_freq,
517 st->info->measurement_mode_freq/2,
518 st->info->measurement_mode_freq/4);
519 break;
520 case SCA3000_MEAS_MODE_OP_1:
521 len += sprintf(buf + len, "%d %d %d\n",
522 st->info->option_mode_1_freq,
523 st->info->option_mode_1_freq/2,
524 st->info->option_mode_1_freq/4);
525 break;
526 case SCA3000_MEAS_MODE_OP_2:
527 len += sprintf(buf + len, "%d %d %d\n",
528 st->info->option_mode_2_freq,
529 st->info->option_mode_2_freq/2,
530 st->info->option_mode_2_freq/4);
531 break;
532 }
533 return len;
534 error_ret:
535 return ret;
536 }
537 /**
538 * __sca3000_get_base_frequency() obtain mode specific base frequency
539 *
540 * lock must be held
541 **/
542 static inline int __sca3000_get_base_freq(struct sca3000_state *st,
543 const struct sca3000_chip_info *info,
544 int *base_freq)
545 {
546 int ret;
547
548 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
549 if (ret)
550 goto error_ret;
551 switch (0x03 & st->rx[0]) {
552 case SCA3000_MEAS_MODE_NORMAL:
553 *base_freq = info->measurement_mode_freq;
554 break;
555 case SCA3000_MEAS_MODE_OP_1:
556 *base_freq = info->option_mode_1_freq;
557 break;
558 case SCA3000_MEAS_MODE_OP_2:
559 *base_freq = info->option_mode_2_freq;
560 break;
561 }
562 error_ret:
563 return ret;
564 }
565
566 /**
567 * sca3000_read_frequency() sysfs interface to get the current frequency
568 **/
569 static ssize_t sca3000_read_frequency(struct device *dev,
570 struct device_attribute *attr,
571 char *buf)
572 {
573 struct iio_dev *indio_dev = dev_get_drvdata(dev);
574 struct sca3000_state *st = iio_priv(indio_dev);
575 int ret, len = 0, base_freq = 0, val;
576
577 mutex_lock(&st->lock);
578 ret = __sca3000_get_base_freq(st, st->info, &base_freq);
579 if (ret)
580 goto error_ret_mut;
581 ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL);
582 mutex_unlock(&st->lock);
583 if (ret)
584 goto error_ret;
585 val = ret;
586 if (base_freq > 0)
587 switch (val & 0x03) {
588 case 0x00:
589 case 0x03:
590 len = sprintf(buf, "%d\n", base_freq);
591 break;
592 case 0x01:
593 len = sprintf(buf, "%d\n", base_freq/2);
594 break;
595 case 0x02:
596 len = sprintf(buf, "%d\n", base_freq/4);
597 break;
598 }
599
600 return len;
601 error_ret_mut:
602 mutex_unlock(&st->lock);
603 error_ret:
604 return ret;
605 }
606
607 /**
608 * sca3000_set_frequency() sysfs interface to set the current frequency
609 **/
610 static ssize_t sca3000_set_frequency(struct device *dev,
611 struct device_attribute *attr,
612 const char *buf,
613 size_t len)
614 {
615 struct iio_dev *indio_dev = dev_get_drvdata(dev);
616 struct sca3000_state *st = iio_priv(indio_dev);
617 int ret, base_freq = 0;
618 int ctrlval;
619 long val;
620
621 ret = strict_strtol(buf, 10, &val);
622 if (ret)
623 return ret;
624
625 mutex_lock(&st->lock);
626 /* What mode are we in? */
627 ret = __sca3000_get_base_freq(st, st->info, &base_freq);
628 if (ret)
629 goto error_free_lock;
630
631 ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL);
632 if (ret < 0)
633 goto error_free_lock;
634 ctrlval = ret;
635 /* clear the bits */
636 ctrlval &= ~0x03;
637
638 if (val == base_freq/2) {
639 ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_2;
640 } else if (val == base_freq/4) {
641 ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_4;
642 } else if (val != base_freq) {
643 ret = -EINVAL;
644 goto error_free_lock;
645 }
646 ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL,
647 ctrlval);
648 error_free_lock:
649 mutex_unlock(&st->lock);
650
651 return ret ? ret : len;
652 }
653
654 /* Should only really be registered if ring buffer support is compiled in.
655 * Does no harm however and doing it right would add a fair bit of complexity
656 */
657 static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sca3000_read_av_freq);
658
659 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
660 sca3000_read_frequency,
661 sca3000_set_frequency);
662
663
664 /**
665 * sca3000_read_temp() sysfs interface to get the temperature when available
666 *
667 * The alignment of data in here is downright odd. See data sheet.
668 * Converting this into a meaningful value is left to inline functions in
669 * userspace part of header.
670 **/
671 static ssize_t sca3000_read_temp(struct device *dev,
672 struct device_attribute *attr,
673 char *buf)
674 {
675 struct iio_dev *indio_dev = dev_get_drvdata(dev);
676 struct sca3000_state *st = iio_priv(indio_dev);
677 int ret;
678 int val;
679 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_TEMP_MSB, 2);
680 if (ret < 0)
681 goto error_ret;
682 val = ((st->rx[0] & 0x3F) << 3) | ((st->rx[1] & 0xE0) >> 5);
683
684 return sprintf(buf, "%d\n", val);
685
686 error_ret:
687 return ret;
688 }
689 static IIO_DEV_ATTR_TEMP_RAW(sca3000_read_temp);
690
691 static IIO_CONST_ATTR_TEMP_SCALE("0.555556");
692 static IIO_CONST_ATTR_TEMP_OFFSET("-214.6");
693
694 /**
695 * sca3000_read_thresh() - query of a threshold
696 **/
697 static int sca3000_read_thresh(struct iio_dev *indio_dev,
698 int e,
699 int *val)
700 {
701 int ret, i;
702 struct sca3000_state *st = iio_priv(indio_dev);
703 int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e);
704 mutex_lock(&st->lock);
705 ret = sca3000_read_ctrl_reg(st, sca3000_addresses[num][1]);
706 mutex_unlock(&st->lock);
707 if (ret < 0)
708 return ret;
709 *val = 0;
710 if (num == 1)
711 for_each_set_bit(i, (unsigned long *)&ret,
712 ARRAY_SIZE(st->info->mot_det_mult_y))
713 *val += st->info->mot_det_mult_y[i];
714 else
715 for_each_set_bit(i, (unsigned long *)&ret,
716 ARRAY_SIZE(st->info->mot_det_mult_xz))
717 *val += st->info->mot_det_mult_xz[i];
718
719 return 0;
720 }
721
722 /**
723 * sca3000_write_thresh() control of threshold
724 **/
725 static int sca3000_write_thresh(struct iio_dev *indio_dev,
726 int e,
727 int val)
728 {
729 struct sca3000_state *st = iio_priv(indio_dev);
730 int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e);
731 int ret;
732 int i;
733 u8 nonlinear = 0;
734
735 if (num == 1) {
736 i = ARRAY_SIZE(st->info->mot_det_mult_y);
737 while (i > 0)
738 if (val >= st->info->mot_det_mult_y[--i]) {
739 nonlinear |= (1 << i);
740 val -= st->info->mot_det_mult_y[i];
741 }
742 } else {
743 i = ARRAY_SIZE(st->info->mot_det_mult_xz);
744 while (i > 0)
745 if (val >= st->info->mot_det_mult_xz[--i]) {
746 nonlinear |= (1 << i);
747 val -= st->info->mot_det_mult_xz[i];
748 }
749 }
750
751 mutex_lock(&st->lock);
752 ret = sca3000_write_ctrl_reg(st, sca3000_addresses[num][1], nonlinear);
753 mutex_unlock(&st->lock);
754
755 return ret;
756 }
757
758 static struct attribute *sca3000_attributes[] = {
759 &iio_dev_attr_revision.dev_attr.attr,
760 &iio_dev_attr_measurement_mode_available.dev_attr.attr,
761 &iio_dev_attr_measurement_mode.dev_attr.attr,
762 &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
763 &iio_dev_attr_sampling_frequency.dev_attr.attr,
764 NULL,
765 };
766
767 static struct attribute *sca3000_attributes_with_temp[] = {
768 &iio_dev_attr_revision.dev_attr.attr,
769 &iio_dev_attr_measurement_mode_available.dev_attr.attr,
770 &iio_dev_attr_measurement_mode.dev_attr.attr,
771 &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
772 &iio_dev_attr_sampling_frequency.dev_attr.attr,
773 /* Only present if temp sensor is */
774 &iio_dev_attr_temp_raw.dev_attr.attr,
775 &iio_const_attr_temp_offset.dev_attr.attr,
776 &iio_const_attr_temp_scale.dev_attr.attr,
777 NULL,
778 };
779
780 static const struct attribute_group sca3000_attribute_group = {
781 .attrs = sca3000_attributes,
782 };
783
784 static const struct attribute_group sca3000_attribute_group_with_temp = {
785 .attrs = sca3000_attributes_with_temp,
786 };
787
788 /* RING RELATED interrupt handler */
789 /* depending on event, push to the ring buffer event chrdev or the event one */
790
791 /**
792 * sca3000_event_handler() - handling ring and non ring events
793 *
794 * This function is complicated by the fact that the devices can signify ring
795 * and non ring events via the same interrupt line and they can only
796 * be distinguished via a read of the relevant status register.
797 **/
798 static irqreturn_t sca3000_event_handler(int irq, void *private)
799 {
800 struct iio_dev *indio_dev = private;
801 struct sca3000_state *st = iio_priv(indio_dev);
802 int ret, val;
803 s64 last_timestamp = iio_get_time_ns();
804
805 /* Could lead if badly timed to an extra read of status reg,
806 * but ensures no interrupt is missed.
807 */
808 mutex_lock(&st->lock);
809 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1);
810 val = st->rx[0];
811 mutex_unlock(&st->lock);
812 if (ret)
813 goto done;
814
815 sca3000_ring_int_process(val, indio_dev->ring);
816
817 if (val & SCA3000_INT_STATUS_FREE_FALL)
818 iio_push_event(indio_dev, 0,
819 IIO_MOD_EVENT_CODE(IIO_EV_CLASS_ACCEL,
820 0,
821 IIO_EV_MOD_X_AND_Y_AND_Z,
822 IIO_EV_TYPE_MAG,
823 IIO_EV_DIR_FALLING),
824 last_timestamp);
825
826 if (val & SCA3000_INT_STATUS_Y_TRIGGER)
827 iio_push_event(indio_dev, 0,
828 IIO_MOD_EVENT_CODE(IIO_EV_CLASS_ACCEL,
829 0,
830 IIO_EV_MOD_Y,
831 IIO_EV_TYPE_MAG,
832 IIO_EV_DIR_RISING),
833 last_timestamp);
834
835 if (val & SCA3000_INT_STATUS_X_TRIGGER)
836 iio_push_event(indio_dev, 0,
837 IIO_MOD_EVENT_CODE(IIO_EV_CLASS_ACCEL,
838 0,
839 IIO_EV_MOD_X,
840 IIO_EV_TYPE_MAG,
841 IIO_EV_DIR_RISING),
842 last_timestamp);
843
844 if (val & SCA3000_INT_STATUS_Z_TRIGGER)
845 iio_push_event(indio_dev, 0,
846 IIO_MOD_EVENT_CODE(IIO_EV_CLASS_ACCEL,
847 0,
848 IIO_EV_MOD_Z,
849 IIO_EV_TYPE_MAG,
850 IIO_EV_DIR_RISING),
851 last_timestamp);
852
853 done:
854 return IRQ_HANDLED;
855 }
856
857 /**
858 * sca3000_read_event_config() what events are enabled
859 **/
860 static int sca3000_read_event_config(struct iio_dev *indio_dev,
861 int e)
862 {
863 struct sca3000_state *st = iio_priv(indio_dev);
864 int ret;
865 u8 protect_mask = 0x03;
866 int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e);
867
868 /* read current value of mode register */
869 mutex_lock(&st->lock);
870 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
871 if (ret)
872 goto error_ret;
873
874 if ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET)
875 ret = 0;
876 else {
877 ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL);
878 if (ret < 0)
879 goto error_ret;
880 /* only supporting logical or's for now */
881 ret = !!(ret & sca3000_addresses[num][2]);
882 }
883 error_ret:
884 mutex_unlock(&st->lock);
885
886 return ret;
887 }
888 /**
889 * sca3000_query_free_fall_mode() is free fall mode enabled
890 **/
891 static ssize_t sca3000_query_free_fall_mode(struct device *dev,
892 struct device_attribute *attr,
893 char *buf)
894 {
895 int ret, len;
896 struct iio_dev *indio_dev = dev_get_drvdata(dev);
897 struct sca3000_state *st = iio_priv(indio_dev);
898 int val;
899
900 mutex_lock(&st->lock);
901 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
902 val = st->rx[0];
903 mutex_unlock(&st->lock);
904 if (ret < 0)
905 return ret;
906 len = sprintf(buf, "%d\n",
907 !!(val & SCA3000_FREE_FALL_DETECT));
908 return len;
909 }
910
911 /**
912 * sca3000_set_free_fall_mode() simple on off control for free fall int
913 *
914 * In these chips the free fall detector should send an interrupt if
915 * the device falls more than 25cm. This has not been tested due
916 * to fragile wiring.
917 **/
918
919 static ssize_t sca3000_set_free_fall_mode(struct device *dev,
920 struct device_attribute *attr,
921 const char *buf,
922 size_t len)
923 {
924 struct iio_dev *indio_dev = dev_get_drvdata(dev);
925 struct sca3000_state *st = iio_priv(indio_dev);
926 long val;
927 int ret;
928 u8 protect_mask = SCA3000_FREE_FALL_DETECT;
929
930 mutex_lock(&st->lock);
931 ret = strict_strtol(buf, 10, &val);
932 if (ret)
933 goto error_ret;
934
935 /* read current value of mode register */
936 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
937 if (ret)
938 goto error_ret;
939
940 /*if off and should be on*/
941 if (val && !(st->rx[0] & protect_mask))
942 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
943 (st->rx[0] | SCA3000_FREE_FALL_DETECT));
944 /* if on and should be off */
945 else if (!val && (st->rx[0] & protect_mask))
946 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
947 (st->rx[0] & ~protect_mask));
948 error_ret:
949 mutex_unlock(&st->lock);
950
951 return ret ? ret : len;
952 }
953
954 /**
955 * sca3000_set_mo_det() simple on off control for motion detector
956 *
957 * This is a per axis control, but enabling any will result in the
958 * motion detector unit being enabled.
959 * N.B. enabling motion detector stops normal data acquisition.
960 * There is a complexity in knowing which mode to return to when
961 * this mode is disabled. Currently normal mode is assumed.
962 **/
963 static int sca3000_write_event_config(struct iio_dev *indio_dev,
964 int e,
965 int state)
966 {
967 struct sca3000_state *st = iio_priv(indio_dev);
968 int ret, ctrlval;
969 u8 protect_mask = 0x03;
970 int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e);
971
972 mutex_lock(&st->lock);
973 /* First read the motion detector config to find out if
974 * this axis is on*/
975 ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL);
976 if (ret < 0)
977 goto exit_point;
978 ctrlval = ret;
979 /* Off and should be on */
980 if (state && !(ctrlval & sca3000_addresses[num][2])) {
981 ret = sca3000_write_ctrl_reg(st,
982 SCA3000_REG_CTRL_SEL_MD_CTRL,
983 ctrlval |
984 sca3000_addresses[num][2]);
985 if (ret)
986 goto exit_point;
987 st->mo_det_use_count++;
988 } else if (!state && (ctrlval & sca3000_addresses[num][2])) {
989 ret = sca3000_write_ctrl_reg(st,
990 SCA3000_REG_CTRL_SEL_MD_CTRL,
991 ctrlval &
992 ~(sca3000_addresses[num][2]));
993 if (ret)
994 goto exit_point;
995 st->mo_det_use_count--;
996 }
997
998 /* read current value of mode register */
999 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
1000 if (ret)
1001 goto exit_point;
1002 /*if off and should be on*/
1003 if ((st->mo_det_use_count)
1004 && ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET))
1005 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
1006 (st->rx[0] & ~protect_mask)
1007 | SCA3000_MEAS_MODE_MOT_DET);
1008 /* if on and should be off */
1009 else if (!(st->mo_det_use_count)
1010 && ((st->rx[0] & protect_mask) == SCA3000_MEAS_MODE_MOT_DET))
1011 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
1012 (st->rx[0] & ~protect_mask));
1013 exit_point:
1014 mutex_unlock(&st->lock);
1015
1016 return ret;
1017 }
1018
1019 /* Free fall detector related event attribute */
1020 static IIO_DEVICE_ATTR_NAMED(accel_xayaz_mag_falling_en,
1021 accel_x&y&z_mag_falling_en,
1022 S_IRUGO | S_IWUSR,
1023 sca3000_query_free_fall_mode,
1024 sca3000_set_free_fall_mode,
1025 0);
1026
1027 static IIO_CONST_ATTR_NAMED(accel_xayaz_mag_falling_period,
1028 accel_x&y&z_mag_falling_period,
1029 "0.226");
1030
1031 static struct attribute *sca3000_event_attributes[] = {
1032 &iio_dev_attr_accel_xayaz_mag_falling_en.dev_attr.attr,
1033 &iio_const_attr_accel_xayaz_mag_falling_period.dev_attr.attr,
1034 NULL,
1035 };
1036
1037 static struct attribute_group sca3000_event_attribute_group = {
1038 .attrs = sca3000_event_attributes,
1039 };
1040
1041 /**
1042 * sca3000_clean_setup() get the device into a predictable state
1043 *
1044 * Devices use flash memory to store many of the register values
1045 * and hence can come up in somewhat unpredictable states.
1046 * Hence reset everything on driver load.
1047 **/
1048 static int sca3000_clean_setup(struct sca3000_state *st)
1049 {
1050 int ret;
1051
1052 mutex_lock(&st->lock);
1053 /* Ensure all interrupts have been acknowledged */
1054 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1);
1055 if (ret)
1056 goto error_ret;
1057
1058 /* Turn off all motion detection channels */
1059 ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL);
1060 if (ret < 0)
1061 goto error_ret;
1062 ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL,
1063 ret & SCA3000_MD_CTRL_PROT_MASK);
1064 if (ret)
1065 goto error_ret;
1066
1067 /* Disable ring buffer */
1068 ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL);
1069 ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL,
1070 (ret & SCA3000_OUT_CTRL_PROT_MASK)
1071 | SCA3000_OUT_CTRL_BUF_X_EN
1072 | SCA3000_OUT_CTRL_BUF_Y_EN
1073 | SCA3000_OUT_CTRL_BUF_Z_EN
1074 | SCA3000_OUT_CTRL_BUF_DIV_4);
1075 if (ret)
1076 goto error_ret;
1077 /* Enable interrupts, relevant to mode and set up as active low */
1078 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1);
1079 if (ret)
1080 goto error_ret;
1081 ret = sca3000_write_reg(st,
1082 SCA3000_REG_ADDR_INT_MASK,
1083 (ret & SCA3000_INT_MASK_PROT_MASK)
1084 | SCA3000_INT_MASK_ACTIVE_LOW);
1085 if (ret)
1086 goto error_ret;
1087 /* Select normal measurement mode, free fall off, ring off */
1088 /* Ring in 12 bit mode - it is fine to overwrite reserved bits 3,5
1089 * as that occurs in one of the example on the datasheet */
1090 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
1091 if (ret)
1092 goto error_ret;
1093 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
1094 (st->rx[0] & SCA3000_MODE_PROT_MASK));
1095 st->bpse = 11;
1096
1097 error_ret:
1098 mutex_unlock(&st->lock);
1099 return ret;
1100 }
1101
1102 static const struct iio_info sca3000_info = {
1103 .attrs = &sca3000_attribute_group,
1104 .read_raw = &sca3000_read_raw,
1105 .num_interrupt_lines = 1,
1106 .event_attrs = &sca3000_event_attribute_group,
1107 .read_event_value = &sca3000_read_thresh,
1108 .write_event_value = &sca3000_write_thresh,
1109 .read_event_config = &sca3000_read_event_config,
1110 .write_event_config = &sca3000_write_event_config,
1111 .driver_module = THIS_MODULE,
1112 };
1113
1114 static const struct iio_info sca3000_info_with_temp = {
1115 .attrs = &sca3000_attribute_group_with_temp,
1116 .read_raw = &sca3000_read_raw,
1117 .read_event_value = &sca3000_read_thresh,
1118 .write_event_value = &sca3000_write_thresh,
1119 .read_event_config = &sca3000_read_event_config,
1120 .write_event_config = &sca3000_write_event_config,
1121 .driver_module = THIS_MODULE,
1122 };
1123
1124 static int __devinit sca3000_probe(struct spi_device *spi)
1125 {
1126 int ret, regdone = 0;
1127 struct sca3000_state *st;
1128 struct iio_dev *indio_dev;
1129
1130 indio_dev = iio_allocate_device(sizeof(*st));
1131 if (indio_dev == NULL) {
1132 ret = -ENOMEM;
1133 goto error_ret;
1134 }
1135
1136 st = iio_priv(indio_dev);
1137 spi_set_drvdata(spi, indio_dev);
1138 st->us = spi;
1139 mutex_init(&st->lock);
1140 st->info = &sca3000_spi_chip_info_tbl[spi_get_device_id(spi)
1141 ->driver_data];
1142
1143 indio_dev->dev.parent = &spi->dev;
1144 indio_dev->name = spi_get_device_id(spi)->name;
1145 if (st->info->temp_output)
1146 indio_dev->info = &sca3000_info_with_temp;
1147 else {
1148 indio_dev->info = &sca3000_info;
1149 indio_dev->channels = sca3000_channels;
1150 indio_dev->num_channels = ARRAY_SIZE(sca3000_channels);
1151 }
1152 indio_dev->modes = INDIO_DIRECT_MODE;
1153
1154 sca3000_configure_ring(indio_dev);
1155 ret = iio_device_register(indio_dev);
1156 if (ret < 0)
1157 goto error_free_dev;
1158 regdone = 1;
1159 ret = iio_ring_buffer_register_ex(indio_dev->ring, 0,
1160 sca3000_channels,
1161 ARRAY_SIZE(sca3000_channels));
1162 if (ret < 0)
1163 goto error_unregister_dev;
1164 if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) {
1165 ret = request_threaded_irq(spi->irq,
1166 NULL,
1167 &sca3000_event_handler,
1168 IRQF_TRIGGER_FALLING,
1169 "sca3000",
1170 indio_dev);
1171 if (ret)
1172 goto error_unregister_ring;
1173 }
1174 sca3000_register_ring_funcs(indio_dev);
1175 ret = sca3000_clean_setup(st);
1176 if (ret)
1177 goto error_free_irq;
1178 return 0;
1179
1180 error_free_irq:
1181 if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0)
1182 free_irq(spi->irq, indio_dev);
1183 error_unregister_ring:
1184 iio_ring_buffer_unregister(indio_dev->ring);
1185 error_unregister_dev:
1186 error_free_dev:
1187 if (regdone)
1188 iio_device_unregister(indio_dev);
1189 else
1190 iio_free_device(indio_dev);
1191
1192 error_ret:
1193 return ret;
1194 }
1195
1196 static int sca3000_stop_all_interrupts(struct sca3000_state *st)
1197 {
1198 int ret;
1199
1200 mutex_lock(&st->lock);
1201 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1);
1202 if (ret)
1203 goto error_ret;
1204 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_INT_MASK,
1205 (st->rx[0] &
1206 ~(SCA3000_INT_MASK_RING_THREE_QUARTER |
1207 SCA3000_INT_MASK_RING_HALF |
1208 SCA3000_INT_MASK_ALL_INTS)));
1209 error_ret:
1210 mutex_unlock(&st->lock);
1211 return ret;
1212 }
1213
1214 static int sca3000_remove(struct spi_device *spi)
1215 {
1216 struct iio_dev *indio_dev = spi_get_drvdata(spi);
1217 struct sca3000_state *st = iio_priv(indio_dev);
1218 int ret;
1219 /* Must ensure no interrupts can be generated after this!*/
1220 ret = sca3000_stop_all_interrupts(st);
1221 if (ret)
1222 return ret;
1223 if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0)
1224 free_irq(spi->irq, indio_dev);
1225 iio_ring_buffer_unregister(indio_dev->ring);
1226 sca3000_unconfigure_ring(indio_dev);
1227 iio_device_unregister(indio_dev);
1228
1229 return 0;
1230 }
1231
1232 static const struct spi_device_id sca3000_id[] = {
1233 {"sca3000_d01", d01},
1234 {"sca3000_e02", e02},
1235 {"sca3000_e04", e04},
1236 {"sca3000_e05", e05},
1237 {}
1238 };
1239
1240 static struct spi_driver sca3000_driver = {
1241 .driver = {
1242 .name = "sca3000",
1243 .owner = THIS_MODULE,
1244 },
1245 .probe = sca3000_probe,
1246 .remove = __devexit_p(sca3000_remove),
1247 .id_table = sca3000_id,
1248 };
1249
1250 static __init int sca3000_init(void)
1251 {
1252 return spi_register_driver(&sca3000_driver);
1253 }
1254 module_init(sca3000_init);
1255
1256 static __exit void sca3000_exit(void)
1257 {
1258 spi_unregister_driver(&sca3000_driver);
1259 }
1260 module_exit(sca3000_exit);
1261
1262 MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>");
1263 MODULE_DESCRIPTION("VTI SCA3000 Series Accelerometers SPI driver");
1264 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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