2 * sca3000_core.c -- support VTI sca3000 series accelerometers via SPI
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.
8 * Copyright (c) 2009 Jonathan Cameron <jic23@kernel.org>
10 * See industrialio/accels/sca3000.h for comments.
13 #include <linux/interrupt.h>
15 #include <linux/device.h>
16 #include <linux/slab.h>
17 #include <linux/kernel.h>
18 #include <linux/spi/spi.h>
19 #include <linux/sysfs.h>
20 #include <linux/module.h>
21 #include <linux/iio/iio.h>
22 #include <linux/iio/sysfs.h>
23 #include <linux/iio/events.h>
24 #include <linux/iio/buffer.h>
28 enum sca3000_variant
{
36 * Note where option modes are not defined, the chip simply does not
38 * Other chips in the sca3000 series use i2c and are not included here.
40 * Some of these devices are only listed in the family data sheet and
41 * do not actually appear to be available.
43 static const struct sca3000_chip_info sca3000_spi_chip_info_tbl
[] = {
47 .measurement_mode_freq
= 250,
48 .option_mode_1
= SCA3000_OP_MODE_BYPASS
,
49 .option_mode_1_freq
= 250,
50 .mot_det_mult_xz
= {50, 100, 200, 350, 650, 1300},
51 .mot_det_mult_y
= {50, 100, 150, 250, 450, 850, 1750},
55 .measurement_mode_freq
= 125,
56 .option_mode_1
= SCA3000_OP_MODE_NARROW
,
57 .option_mode_1_freq
= 63,
58 .mot_det_mult_xz
= {100, 150, 300, 550, 1050, 2050},
59 .mot_det_mult_y
= {50, 100, 200, 350, 700, 1350, 2700},
63 .measurement_mode_freq
= 100,
64 .option_mode_1
= SCA3000_OP_MODE_NARROW
,
65 .option_mode_1_freq
= 50,
66 .option_mode_2
= SCA3000_OP_MODE_WIDE
,
67 .option_mode_2_freq
= 400,
68 .mot_det_mult_xz
= {200, 300, 600, 1100, 2100, 4100},
69 .mot_det_mult_y
= {100, 200, 400, 7000, 1400, 2700, 54000},
73 .measurement_mode_freq
= 200,
74 .option_mode_1
= SCA3000_OP_MODE_NARROW
,
75 .option_mode_1_freq
= 50,
76 .option_mode_2
= SCA3000_OP_MODE_WIDE
,
77 .option_mode_2_freq
= 400,
78 .mot_det_mult_xz
= {600, 900, 1700, 3200, 6100, 11900},
79 .mot_det_mult_y
= {300, 600, 1200, 2000, 4100, 7800, 15600},
83 int sca3000_write_reg(struct sca3000_state
*st
, u8 address
, u8 val
)
85 st
->tx
[0] = SCA3000_WRITE_REG(address
);
87 return spi_write(st
->us
, st
->tx
, 2);
90 int sca3000_read_data_short(struct sca3000_state
*st
,
91 uint8_t reg_address_high
,
94 struct spi_transfer xfer
[2] = {
103 st
->tx
[0] = SCA3000_READ_REG(reg_address_high
);
105 return spi_sync_transfer(st
->us
, xfer
, ARRAY_SIZE(xfer
));
109 * sca3000_reg_lock_on() test if the ctrl register lock is on
113 static int sca3000_reg_lock_on(struct sca3000_state
*st
)
117 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_STATUS
, 1);
121 return !(st
->rx
[0] & SCA3000_LOCKED
);
125 * __sca3000_unlock_reg_lock() unlock the control registers
127 * Note the device does not appear to support doing this in a single transfer.
128 * This should only ever be used as part of ctrl reg read.
129 * Lock must be held before calling this
131 static int __sca3000_unlock_reg_lock(struct sca3000_state
*st
)
133 struct spi_transfer xfer
[3] = {
141 .tx_buf
= st
->tx
+ 2,
144 .tx_buf
= st
->tx
+ 4,
147 st
->tx
[0] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK
);
149 st
->tx
[2] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK
);
151 st
->tx
[4] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK
);
154 return spi_sync_transfer(st
->us
, xfer
, ARRAY_SIZE(xfer
));
158 * sca3000_write_ctrl_reg() write to a lock protect ctrl register
159 * @sel: selects which registers we wish to write to
160 * @val: the value to be written
162 * Certain control registers are protected against overwriting by the lock
163 * register and use a shared write address. This function allows writing of
167 static int sca3000_write_ctrl_reg(struct sca3000_state
*st
,
174 ret
= sca3000_reg_lock_on(st
);
178 ret
= __sca3000_unlock_reg_lock(st
);
183 /* Set the control select register */
184 ret
= sca3000_write_reg(st
, SCA3000_REG_ADDR_CTRL_SEL
, sel
);
188 /* Write the actual value into the register */
189 ret
= sca3000_write_reg(st
, SCA3000_REG_ADDR_CTRL_DATA
, val
);
196 * sca3000_read_ctrl_reg() read from lock protected control register.
200 static int sca3000_read_ctrl_reg(struct sca3000_state
*st
,
205 ret
= sca3000_reg_lock_on(st
);
209 ret
= __sca3000_unlock_reg_lock(st
);
213 /* Set the control select register */
214 ret
= sca3000_write_reg(st
, SCA3000_REG_ADDR_CTRL_SEL
, ctrl_reg
);
217 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_CTRL_DATA
, 1);
227 * sca3000_show_rev() - sysfs interface to read the chip revision number
229 static ssize_t
sca3000_show_rev(struct device
*dev
,
230 struct device_attribute
*attr
,
234 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
235 struct sca3000_state
*st
= iio_priv(indio_dev
);
237 mutex_lock(&st
->lock
);
238 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_REVID
, 1);
241 len
+= sprintf(buf
+ len
,
242 "major=%d, minor=%d\n",
243 st
->rx
[0] & SCA3000_REVID_MAJOR_MASK
,
244 st
->rx
[0] & SCA3000_REVID_MINOR_MASK
);
246 mutex_unlock(&st
->lock
);
248 return ret
? ret
: len
;
252 * sca3000_show_available_measurement_modes() display available modes
254 * This is all read from chip specific data in the driver. Not all
255 * of the sca3000 series support modes other than normal.
258 sca3000_show_available_measurement_modes(struct device
*dev
,
259 struct device_attribute
*attr
,
262 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
263 struct sca3000_state
*st
= iio_priv(indio_dev
);
266 len
+= sprintf(buf
+ len
, "0 - normal mode");
267 switch (st
->info
->option_mode_1
) {
268 case SCA3000_OP_MODE_NARROW
:
269 len
+= sprintf(buf
+ len
, ", 1 - narrow mode");
271 case SCA3000_OP_MODE_BYPASS
:
272 len
+= sprintf(buf
+ len
, ", 1 - bypass mode");
275 switch (st
->info
->option_mode_2
) {
276 case SCA3000_OP_MODE_WIDE
:
277 len
+= sprintf(buf
+ len
, ", 2 - wide mode");
280 /* always supported */
281 len
+= sprintf(buf
+ len
, " 3 - motion detection\n");
287 * sca3000_show_measurement_mode() sysfs read of current mode
290 sca3000_show_measurement_mode(struct device
*dev
,
291 struct device_attribute
*attr
,
294 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
295 struct sca3000_state
*st
= iio_priv(indio_dev
);
298 mutex_lock(&st
->lock
);
299 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_MODE
, 1);
302 /* mask bottom 2 bits - only ones that are relevant */
305 case SCA3000_MEAS_MODE_NORMAL
:
306 len
+= sprintf(buf
+ len
, "0 - normal mode\n");
308 case SCA3000_MEAS_MODE_MOT_DET
:
309 len
+= sprintf(buf
+ len
, "3 - motion detection\n");
311 case SCA3000_MEAS_MODE_OP_1
:
312 switch (st
->info
->option_mode_1
) {
313 case SCA3000_OP_MODE_NARROW
:
314 len
+= sprintf(buf
+ len
, "1 - narrow mode\n");
316 case SCA3000_OP_MODE_BYPASS
:
317 len
+= sprintf(buf
+ len
, "1 - bypass mode\n");
321 case SCA3000_MEAS_MODE_OP_2
:
322 switch (st
->info
->option_mode_2
) {
323 case SCA3000_OP_MODE_WIDE
:
324 len
+= sprintf(buf
+ len
, "2 - wide mode\n");
331 mutex_unlock(&st
->lock
);
333 return ret
? ret
: len
;
337 * sca3000_store_measurement_mode() set the current mode
340 sca3000_store_measurement_mode(struct device
*dev
,
341 struct device_attribute
*attr
,
345 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
346 struct sca3000_state
*st
= iio_priv(indio_dev
);
351 mutex_lock(&st
->lock
);
352 ret
= kstrtou8(buf
, 10, &val
);
359 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_MODE
, 1);
363 st
->rx
[0] |= (val
& mask
);
364 ret
= sca3000_write_reg(st
, SCA3000_REG_ADDR_MODE
, st
->rx
[0]);
367 mutex_unlock(&st
->lock
);
372 mutex_unlock(&st
->lock
);
379 * Not even vaguely standard attributes so defined here rather than
380 * in the relevant IIO core headers
382 static IIO_DEVICE_ATTR(measurement_mode_available
, S_IRUGO
,
383 sca3000_show_available_measurement_modes
,
386 static IIO_DEVICE_ATTR(measurement_mode
, S_IRUGO
| S_IWUSR
,
387 sca3000_show_measurement_mode
,
388 sca3000_store_measurement_mode
,
391 /* More standard attributes */
393 static IIO_DEVICE_ATTR(revision
, S_IRUGO
, sca3000_show_rev
, NULL
, 0);
395 static const struct iio_event_spec sca3000_event
= {
396 .type
= IIO_EV_TYPE_MAG
,
397 .dir
= IIO_EV_DIR_RISING
,
398 .mask_separate
= BIT(IIO_EV_INFO_VALUE
) | BIT(IIO_EV_INFO_ENABLE
),
401 #define SCA3000_CHAN(index, mod) \
406 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
407 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
409 .scan_index = index, \
416 .event_spec = &sca3000_event, \
417 .num_event_specs = 1, \
420 static const struct iio_chan_spec sca3000_channels
[] = {
421 SCA3000_CHAN(0, IIO_MOD_X
),
422 SCA3000_CHAN(1, IIO_MOD_Y
),
423 SCA3000_CHAN(2, IIO_MOD_Z
),
426 static const struct iio_chan_spec sca3000_channels_with_temp
[] = {
427 SCA3000_CHAN(0, IIO_MOD_X
),
428 SCA3000_CHAN(1, IIO_MOD_Y
),
429 SCA3000_CHAN(2, IIO_MOD_Z
),
432 .info_mask_separate
= BIT(IIO_CHAN_INFO_RAW
),
433 .info_mask_shared_by_type
= BIT(IIO_CHAN_INFO_SCALE
) |
434 BIT(IIO_CHAN_INFO_OFFSET
),
435 /* No buffer support */
440 static u8 sca3000_addresses
[3][3] = {
441 [0] = {SCA3000_REG_ADDR_X_MSB
, SCA3000_REG_CTRL_SEL_MD_X_TH
,
442 SCA3000_MD_CTRL_OR_X
},
443 [1] = {SCA3000_REG_ADDR_Y_MSB
, SCA3000_REG_CTRL_SEL_MD_Y_TH
,
444 SCA3000_MD_CTRL_OR_Y
},
445 [2] = {SCA3000_REG_ADDR_Z_MSB
, SCA3000_REG_CTRL_SEL_MD_Z_TH
,
446 SCA3000_MD_CTRL_OR_Z
},
449 static int sca3000_read_raw(struct iio_dev
*indio_dev
,
450 struct iio_chan_spec
const *chan
,
455 struct sca3000_state
*st
= iio_priv(indio_dev
);
460 case IIO_CHAN_INFO_RAW
:
461 mutex_lock(&st
->lock
);
462 if (chan
->type
== IIO_ACCEL
) {
463 if (st
->mo_det_use_count
) {
464 mutex_unlock(&st
->lock
);
467 address
= sca3000_addresses
[chan
->address
][0];
468 ret
= sca3000_read_data_short(st
, address
, 2);
470 mutex_unlock(&st
->lock
);
473 *val
= (be16_to_cpup((__be16
*)st
->rx
) >> 3) & 0x1FFF;
474 *val
= ((*val
) << (sizeof(*val
)*8 - 13)) >>
475 (sizeof(*val
)*8 - 13);
477 /* get the temperature when available */
478 ret
= sca3000_read_data_short(st
,
479 SCA3000_REG_ADDR_TEMP_MSB
, 2);
481 mutex_unlock(&st
->lock
);
484 *val
= ((st
->rx
[0] & 0x3F) << 3) |
485 ((st
->rx
[1] & 0xE0) >> 5);
487 mutex_unlock(&st
->lock
);
489 case IIO_CHAN_INFO_SCALE
:
491 if (chan
->type
== IIO_ACCEL
)
492 *val2
= st
->info
->scale
;
493 else /* temperature */
495 return IIO_VAL_INT_PLUS_MICRO
;
496 case IIO_CHAN_INFO_OFFSET
:
499 return IIO_VAL_INT_PLUS_MICRO
;
506 * sca3000_read_av_freq() sysfs function to get available frequencies
508 * The later modes are only relevant to the ring buffer - and depend on current
509 * mode. Note that data sheet gives rather wide tolerances for these so integer
510 * division will give good enough answer and not all chips have them specified
513 static ssize_t
sca3000_read_av_freq(struct device
*dev
,
514 struct device_attribute
*attr
,
517 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
518 struct sca3000_state
*st
= iio_priv(indio_dev
);
519 int len
= 0, ret
, val
;
521 mutex_lock(&st
->lock
);
522 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_MODE
, 1);
524 mutex_unlock(&st
->lock
);
528 switch (val
& 0x03) {
529 case SCA3000_MEAS_MODE_NORMAL
:
530 len
+= sprintf(buf
+ len
, "%d %d %d\n",
531 st
->info
->measurement_mode_freq
,
532 st
->info
->measurement_mode_freq
/2,
533 st
->info
->measurement_mode_freq
/4);
535 case SCA3000_MEAS_MODE_OP_1
:
536 len
+= sprintf(buf
+ len
, "%d %d %d\n",
537 st
->info
->option_mode_1_freq
,
538 st
->info
->option_mode_1_freq
/2,
539 st
->info
->option_mode_1_freq
/4);
541 case SCA3000_MEAS_MODE_OP_2
:
542 len
+= sprintf(buf
+ len
, "%d %d %d\n",
543 st
->info
->option_mode_2_freq
,
544 st
->info
->option_mode_2_freq
/2,
545 st
->info
->option_mode_2_freq
/4);
553 * __sca3000_get_base_freq() obtain mode specific base frequency
557 static inline int __sca3000_get_base_freq(struct sca3000_state
*st
,
558 const struct sca3000_chip_info
*info
,
563 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_MODE
, 1);
566 switch (0x03 & st
->rx
[0]) {
567 case SCA3000_MEAS_MODE_NORMAL
:
568 *base_freq
= info
->measurement_mode_freq
;
570 case SCA3000_MEAS_MODE_OP_1
:
571 *base_freq
= info
->option_mode_1_freq
;
573 case SCA3000_MEAS_MODE_OP_2
:
574 *base_freq
= info
->option_mode_2_freq
;
582 * sca3000_read_frequency() sysfs interface to get the current frequency
584 static ssize_t
sca3000_read_frequency(struct device
*dev
,
585 struct device_attribute
*attr
,
588 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
589 struct sca3000_state
*st
= iio_priv(indio_dev
);
590 int ret
, len
= 0, base_freq
= 0, val
;
592 mutex_lock(&st
->lock
);
593 ret
= __sca3000_get_base_freq(st
, st
->info
, &base_freq
);
596 ret
= sca3000_read_ctrl_reg(st
, SCA3000_REG_CTRL_SEL_OUT_CTRL
);
597 mutex_unlock(&st
->lock
);
602 switch (val
& 0x03) {
605 len
= sprintf(buf
, "%d\n", base_freq
);
608 len
= sprintf(buf
, "%d\n", base_freq
/2);
611 len
= sprintf(buf
, "%d\n", base_freq
/4);
617 mutex_unlock(&st
->lock
);
623 * sca3000_set_frequency() sysfs interface to set the current frequency
625 static ssize_t
sca3000_set_frequency(struct device
*dev
,
626 struct device_attribute
*attr
,
630 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
631 struct sca3000_state
*st
= iio_priv(indio_dev
);
632 int ret
, base_freq
= 0;
636 ret
= kstrtoint(buf
, 10, &val
);
640 mutex_lock(&st
->lock
);
641 /* What mode are we in? */
642 ret
= __sca3000_get_base_freq(st
, st
->info
, &base_freq
);
644 goto error_free_lock
;
646 ret
= sca3000_read_ctrl_reg(st
, SCA3000_REG_CTRL_SEL_OUT_CTRL
);
648 goto error_free_lock
;
653 if (val
== base_freq
/2) {
654 ctrlval
|= SCA3000_OUT_CTRL_BUF_DIV_2
;
655 } else if (val
== base_freq
/4) {
656 ctrlval
|= SCA3000_OUT_CTRL_BUF_DIV_4
;
657 } else if (val
!= base_freq
) {
659 goto error_free_lock
;
661 ret
= sca3000_write_ctrl_reg(st
, SCA3000_REG_CTRL_SEL_OUT_CTRL
,
664 mutex_unlock(&st
->lock
);
666 return ret
? ret
: len
;
670 * Should only really be registered if ring buffer support is compiled in.
671 * Does no harm however and doing it right would add a fair bit of complexity
673 static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sca3000_read_av_freq
);
675 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR
| S_IRUGO
,
676 sca3000_read_frequency
,
677 sca3000_set_frequency
);
680 * sca3000_read_thresh() - query of a threshold
682 static int sca3000_read_thresh(struct iio_dev
*indio_dev
,
683 const struct iio_chan_spec
*chan
,
684 enum iio_event_type type
,
685 enum iio_event_direction dir
,
686 enum iio_event_info info
,
690 struct sca3000_state
*st
= iio_priv(indio_dev
);
691 int num
= chan
->channel2
;
693 mutex_lock(&st
->lock
);
694 ret
= sca3000_read_ctrl_reg(st
, sca3000_addresses
[num
][1]);
695 mutex_unlock(&st
->lock
);
700 for_each_set_bit(i
, (unsigned long *)&ret
,
701 ARRAY_SIZE(st
->info
->mot_det_mult_y
))
702 *val
+= st
->info
->mot_det_mult_y
[i
];
704 for_each_set_bit(i
, (unsigned long *)&ret
,
705 ARRAY_SIZE(st
->info
->mot_det_mult_xz
))
706 *val
+= st
->info
->mot_det_mult_xz
[i
];
712 * sca3000_write_thresh() control of threshold
714 static int sca3000_write_thresh(struct iio_dev
*indio_dev
,
715 const struct iio_chan_spec
*chan
,
716 enum iio_event_type type
,
717 enum iio_event_direction dir
,
718 enum iio_event_info info
,
721 struct sca3000_state
*st
= iio_priv(indio_dev
);
722 int num
= chan
->channel2
;
728 i
= ARRAY_SIZE(st
->info
->mot_det_mult_y
);
730 if (val
>= st
->info
->mot_det_mult_y
[--i
]) {
731 nonlinear
|= (1 << i
);
732 val
-= st
->info
->mot_det_mult_y
[i
];
735 i
= ARRAY_SIZE(st
->info
->mot_det_mult_xz
);
737 if (val
>= st
->info
->mot_det_mult_xz
[--i
]) {
738 nonlinear
|= (1 << i
);
739 val
-= st
->info
->mot_det_mult_xz
[i
];
743 mutex_lock(&st
->lock
);
744 ret
= sca3000_write_ctrl_reg(st
, sca3000_addresses
[num
][1], nonlinear
);
745 mutex_unlock(&st
->lock
);
750 static struct attribute
*sca3000_attributes
[] = {
751 &iio_dev_attr_revision
.dev_attr
.attr
,
752 &iio_dev_attr_measurement_mode_available
.dev_attr
.attr
,
753 &iio_dev_attr_measurement_mode
.dev_attr
.attr
,
754 &iio_dev_attr_sampling_frequency_available
.dev_attr
.attr
,
755 &iio_dev_attr_sampling_frequency
.dev_attr
.attr
,
759 static const struct attribute_group sca3000_attribute_group
= {
760 .attrs
= sca3000_attributes
,
764 * sca3000_event_handler() - handling ring and non ring events
766 * Ring related interrupt handler. Depending on event, push to
767 * the ring buffer event chrdev or the event one.
769 * This function is complicated by the fact that the devices can signify ring
770 * and non ring events via the same interrupt line and they can only
771 * be distinguished via a read of the relevant status register.
773 static irqreturn_t
sca3000_event_handler(int irq
, void *private)
775 struct iio_dev
*indio_dev
= private;
776 struct sca3000_state
*st
= iio_priv(indio_dev
);
778 s64 last_timestamp
= iio_get_time_ns();
781 * Could lead if badly timed to an extra read of status reg,
782 * but ensures no interrupt is missed.
784 mutex_lock(&st
->lock
);
785 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_INT_STATUS
, 1);
787 mutex_unlock(&st
->lock
);
791 sca3000_ring_int_process(val
, indio_dev
->buffer
);
793 if (val
& SCA3000_INT_STATUS_FREE_FALL
)
794 iio_push_event(indio_dev
,
795 IIO_MOD_EVENT_CODE(IIO_ACCEL
,
797 IIO_MOD_X_AND_Y_AND_Z
,
802 if (val
& SCA3000_INT_STATUS_Y_TRIGGER
)
803 iio_push_event(indio_dev
,
804 IIO_MOD_EVENT_CODE(IIO_ACCEL
,
811 if (val
& SCA3000_INT_STATUS_X_TRIGGER
)
812 iio_push_event(indio_dev
,
813 IIO_MOD_EVENT_CODE(IIO_ACCEL
,
820 if (val
& SCA3000_INT_STATUS_Z_TRIGGER
)
821 iio_push_event(indio_dev
,
822 IIO_MOD_EVENT_CODE(IIO_ACCEL
,
834 * sca3000_read_event_config() what events are enabled
836 static int sca3000_read_event_config(struct iio_dev
*indio_dev
,
837 const struct iio_chan_spec
*chan
,
838 enum iio_event_type type
,
839 enum iio_event_direction dir
)
841 struct sca3000_state
*st
= iio_priv(indio_dev
);
843 u8 protect_mask
= 0x03;
844 int num
= chan
->channel2
;
846 /* read current value of mode register */
847 mutex_lock(&st
->lock
);
848 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_MODE
, 1);
852 if ((st
->rx
[0] & protect_mask
) != SCA3000_MEAS_MODE_MOT_DET
)
855 ret
= sca3000_read_ctrl_reg(st
, SCA3000_REG_CTRL_SEL_MD_CTRL
);
858 /* only supporting logical or's for now */
859 ret
= !!(ret
& sca3000_addresses
[num
][2]);
862 mutex_unlock(&st
->lock
);
867 * sca3000_query_free_fall_mode() is free fall mode enabled
869 static ssize_t
sca3000_query_free_fall_mode(struct device
*dev
,
870 struct device_attribute
*attr
,
874 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
875 struct sca3000_state
*st
= iio_priv(indio_dev
);
878 mutex_lock(&st
->lock
);
879 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_MODE
, 1);
881 mutex_unlock(&st
->lock
);
884 return sprintf(buf
, "%d\n", !!(val
& SCA3000_FREE_FALL_DETECT
));
888 * sca3000_set_free_fall_mode() simple on off control for free fall int
890 * In these chips the free fall detector should send an interrupt if
891 * the device falls more than 25cm. This has not been tested due
894 static ssize_t
sca3000_set_free_fall_mode(struct device
*dev
,
895 struct device_attribute
*attr
,
899 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
900 struct sca3000_state
*st
= iio_priv(indio_dev
);
903 u8 protect_mask
= SCA3000_FREE_FALL_DETECT
;
905 mutex_lock(&st
->lock
);
906 ret
= kstrtou8(buf
, 10, &val
);
910 /* read current value of mode register */
911 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_MODE
, 1);
915 /* if off and should be on */
916 if (val
&& !(st
->rx
[0] & protect_mask
))
917 ret
= sca3000_write_reg(st
, SCA3000_REG_ADDR_MODE
,
918 (st
->rx
[0] | SCA3000_FREE_FALL_DETECT
));
919 /* if on and should be off */
920 else if (!val
&& (st
->rx
[0] & protect_mask
))
921 ret
= sca3000_write_reg(st
, SCA3000_REG_ADDR_MODE
,
922 (st
->rx
[0] & ~protect_mask
));
924 mutex_unlock(&st
->lock
);
926 return ret
? ret
: len
;
930 * sca3000_write_event_config() simple on off control for motion detector
932 * This is a per axis control, but enabling any will result in the
933 * motion detector unit being enabled.
934 * N.B. enabling motion detector stops normal data acquisition.
935 * There is a complexity in knowing which mode to return to when
936 * this mode is disabled. Currently normal mode is assumed.
938 static int sca3000_write_event_config(struct iio_dev
*indio_dev
,
939 const struct iio_chan_spec
*chan
,
940 enum iio_event_type type
,
941 enum iio_event_direction dir
,
944 struct sca3000_state
*st
= iio_priv(indio_dev
);
946 u8 protect_mask
= 0x03;
947 int num
= chan
->channel2
;
949 mutex_lock(&st
->lock
);
951 * First read the motion detector config to find out if
954 ret
= sca3000_read_ctrl_reg(st
, SCA3000_REG_CTRL_SEL_MD_CTRL
);
958 /* if off and should be on */
959 if (state
&& !(ctrlval
& sca3000_addresses
[num
][2])) {
960 ret
= sca3000_write_ctrl_reg(st
,
961 SCA3000_REG_CTRL_SEL_MD_CTRL
,
963 sca3000_addresses
[num
][2]);
966 st
->mo_det_use_count
++;
967 } else if (!state
&& (ctrlval
& sca3000_addresses
[num
][2])) {
968 ret
= sca3000_write_ctrl_reg(st
,
969 SCA3000_REG_CTRL_SEL_MD_CTRL
,
971 ~(sca3000_addresses
[num
][2]));
974 st
->mo_det_use_count
--;
977 /* read current value of mode register */
978 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_MODE
, 1);
981 /* if off and should be on */
982 if ((st
->mo_det_use_count
)
983 && ((st
->rx
[0] & protect_mask
) != SCA3000_MEAS_MODE_MOT_DET
))
984 ret
= sca3000_write_reg(st
, SCA3000_REG_ADDR_MODE
,
985 (st
->rx
[0] & ~protect_mask
)
986 | SCA3000_MEAS_MODE_MOT_DET
);
987 /* if on and should be off */
988 else if (!(st
->mo_det_use_count
)
989 && ((st
->rx
[0] & protect_mask
) == SCA3000_MEAS_MODE_MOT_DET
))
990 ret
= sca3000_write_reg(st
, SCA3000_REG_ADDR_MODE
,
991 (st
->rx
[0] & ~protect_mask
));
993 mutex_unlock(&st
->lock
);
998 /* Free fall detector related event attribute */
999 static IIO_DEVICE_ATTR_NAMED(accel_xayaz_mag_falling_en
,
1000 in_accel_x
&y
&z_mag_falling_en
,
1002 sca3000_query_free_fall_mode
,
1003 sca3000_set_free_fall_mode
,
1006 static IIO_CONST_ATTR_NAMED(accel_xayaz_mag_falling_period
,
1007 in_accel_x
&y
&z_mag_falling_period
,
1010 static struct attribute
*sca3000_event_attributes
[] = {
1011 &iio_dev_attr_accel_xayaz_mag_falling_en
.dev_attr
.attr
,
1012 &iio_const_attr_accel_xayaz_mag_falling_period
.dev_attr
.attr
,
1016 static struct attribute_group sca3000_event_attribute_group
= {
1017 .attrs
= sca3000_event_attributes
,
1022 * sca3000_clean_setup() get the device into a predictable state
1024 * Devices use flash memory to store many of the register values
1025 * and hence can come up in somewhat unpredictable states.
1026 * Hence reset everything on driver load.
1028 static int sca3000_clean_setup(struct sca3000_state
*st
)
1032 mutex_lock(&st
->lock
);
1033 /* Ensure all interrupts have been acknowledged */
1034 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_INT_STATUS
, 1);
1038 /* Turn off all motion detection channels */
1039 ret
= sca3000_read_ctrl_reg(st
, SCA3000_REG_CTRL_SEL_MD_CTRL
);
1042 ret
= sca3000_write_ctrl_reg(st
, SCA3000_REG_CTRL_SEL_MD_CTRL
,
1043 ret
& SCA3000_MD_CTRL_PROT_MASK
);
1047 /* Disable ring buffer */
1048 ret
= sca3000_read_ctrl_reg(st
, SCA3000_REG_CTRL_SEL_OUT_CTRL
);
1049 ret
= sca3000_write_ctrl_reg(st
, SCA3000_REG_CTRL_SEL_OUT_CTRL
,
1050 (ret
& SCA3000_OUT_CTRL_PROT_MASK
)
1051 | SCA3000_OUT_CTRL_BUF_X_EN
1052 | SCA3000_OUT_CTRL_BUF_Y_EN
1053 | SCA3000_OUT_CTRL_BUF_Z_EN
1054 | SCA3000_OUT_CTRL_BUF_DIV_4
);
1057 /* Enable interrupts, relevant to mode and set up as active low */
1058 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_INT_MASK
, 1);
1061 ret
= sca3000_write_reg(st
,
1062 SCA3000_REG_ADDR_INT_MASK
,
1063 (ret
& SCA3000_INT_MASK_PROT_MASK
)
1064 | SCA3000_INT_MASK_ACTIVE_LOW
);
1068 * Select normal measurement mode, free fall off, ring off
1069 * Ring in 12 bit mode - it is fine to overwrite reserved bits 3,5
1070 * as that occurs in one of the example on the datasheet
1072 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_MODE
, 1);
1075 ret
= sca3000_write_reg(st
, SCA3000_REG_ADDR_MODE
,
1076 (st
->rx
[0] & SCA3000_MODE_PROT_MASK
));
1080 mutex_unlock(&st
->lock
);
1084 static const struct iio_info sca3000_info
= {
1085 .attrs
= &sca3000_attribute_group
,
1086 .read_raw
= &sca3000_read_raw
,
1087 .event_attrs
= &sca3000_event_attribute_group
,
1088 .read_event_value
= &sca3000_read_thresh
,
1089 .write_event_value
= &sca3000_write_thresh
,
1090 .read_event_config
= &sca3000_read_event_config
,
1091 .write_event_config
= &sca3000_write_event_config
,
1092 .driver_module
= THIS_MODULE
,
1095 static int sca3000_probe(struct spi_device
*spi
)
1098 struct sca3000_state
*st
;
1099 struct iio_dev
*indio_dev
;
1101 indio_dev
= devm_iio_device_alloc(&spi
->dev
, sizeof(*st
));
1105 st
= iio_priv(indio_dev
);
1106 spi_set_drvdata(spi
, indio_dev
);
1108 mutex_init(&st
->lock
);
1109 st
->info
= &sca3000_spi_chip_info_tbl
[spi_get_device_id(spi
)
1112 indio_dev
->dev
.parent
= &spi
->dev
;
1113 indio_dev
->name
= spi_get_device_id(spi
)->name
;
1114 indio_dev
->info
= &sca3000_info
;
1115 if (st
->info
->temp_output
) {
1116 indio_dev
->channels
= sca3000_channels_with_temp
;
1117 indio_dev
->num_channels
=
1118 ARRAY_SIZE(sca3000_channels_with_temp
);
1120 indio_dev
->channels
= sca3000_channels
;
1121 indio_dev
->num_channels
= ARRAY_SIZE(sca3000_channels
);
1123 indio_dev
->modes
= INDIO_DIRECT_MODE
;
1125 sca3000_configure_ring(indio_dev
);
1126 ret
= iio_device_register(indio_dev
);
1131 ret
= request_threaded_irq(spi
->irq
,
1133 &sca3000_event_handler
,
1134 IRQF_TRIGGER_FALLING
| IRQF_ONESHOT
,
1138 goto error_unregister_dev
;
1140 sca3000_register_ring_funcs(indio_dev
);
1141 ret
= sca3000_clean_setup(st
);
1143 goto error_free_irq
;
1148 free_irq(spi
->irq
, indio_dev
);
1149 error_unregister_dev
:
1150 iio_device_unregister(indio_dev
);
1154 static int sca3000_stop_all_interrupts(struct sca3000_state
*st
)
1158 mutex_lock(&st
->lock
);
1159 ret
= sca3000_read_data_short(st
, SCA3000_REG_ADDR_INT_MASK
, 1);
1162 ret
= sca3000_write_reg(st
, SCA3000_REG_ADDR_INT_MASK
,
1164 ~(SCA3000_INT_MASK_RING_THREE_QUARTER
|
1165 SCA3000_INT_MASK_RING_HALF
|
1166 SCA3000_INT_MASK_ALL_INTS
)));
1168 mutex_unlock(&st
->lock
);
1172 static int sca3000_remove(struct spi_device
*spi
)
1174 struct iio_dev
*indio_dev
= spi_get_drvdata(spi
);
1175 struct sca3000_state
*st
= iio_priv(indio_dev
);
1177 /* Must ensure no interrupts can be generated after this! */
1178 sca3000_stop_all_interrupts(st
);
1180 free_irq(spi
->irq
, indio_dev
);
1181 iio_device_unregister(indio_dev
);
1182 sca3000_unconfigure_ring(indio_dev
);
1187 static const struct spi_device_id sca3000_id
[] = {
1188 {"sca3000_d01", d01
},
1189 {"sca3000_e02", e02
},
1190 {"sca3000_e04", e04
},
1191 {"sca3000_e05", e05
},
1194 MODULE_DEVICE_TABLE(spi
, sca3000_id
);
1196 static struct spi_driver sca3000_driver
= {
1199 .owner
= THIS_MODULE
,
1201 .probe
= sca3000_probe
,
1202 .remove
= sca3000_remove
,
1203 .id_table
= sca3000_id
,
1205 module_spi_driver(sca3000_driver
);
1207 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1208 MODULE_DESCRIPTION("VTI SCA3000 Series Accelerometers SPI driver");
1209 MODULE_LICENSE("GPL v2");