2 * lis3l02dq.c support STMicroelectronics LISD02DQ
3 * 3d 2g Linear Accelerometers via SPI
5 * Copyright (c) 2007 Jonathan Cameron <jic23@cam.ac.uk>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * 16 bit left justified mode used.
15 #include <linux/interrupt.h>
16 #include <linux/irq.h>
17 #include <linux/gpio.h>
18 #include <linux/workqueue.h>
19 #include <linux/mutex.h>
20 #include <linux/device.h>
21 #include <linux/kernel.h>
22 #include <linux/spi/spi.h>
23 #include <linux/slab.h>
25 #include <linux/sysfs.h>
26 #include <linux/list.h>
32 #include "lis3l02dq.h"
34 /* At the moment the spi framework doesn't allow global setting of cs_change.
35 * It's in the likely to be added comment at the top of spi.h.
36 * This means that use cannot be made of spi_write etc.
40 * lis3l02dq_spi_read_reg_8() - read single byte from a single register
41 * @dev: device asosciated with child of actual device (iio_dev or iio_trig)
42 * @reg_address: the address of the register to be read
43 * @val: pass back the resulting value
45 int lis3l02dq_spi_read_reg_8(struct device
*dev
, u8 reg_address
, u8
*val
)
48 struct spi_message msg
;
49 struct iio_dev
*indio_dev
= dev_get_drvdata(dev
);
50 struct lis3l02dq_state
*st
= iio_dev_get_devdata(indio_dev
);
51 struct spi_transfer xfer
= {
59 mutex_lock(&st
->buf_lock
);
60 st
->tx
[0] = LIS3L02DQ_READ_REG(reg_address
);
63 spi_message_init(&msg
);
64 spi_message_add_tail(&xfer
, &msg
);
65 ret
= spi_sync(st
->us
, &msg
);
67 mutex_unlock(&st
->buf_lock
);
73 * lis3l02dq_spi_write_reg_8() - write single byte to a register
74 * @dev: device associated with child of actual device (iio_dev or iio_trig)
75 * @reg_address: the address of the register to be writen
76 * @val: the value to write
78 int lis3l02dq_spi_write_reg_8(struct device
*dev
,
83 struct spi_message msg
;
84 struct iio_dev
*indio_dev
= dev_get_drvdata(dev
);
85 struct lis3l02dq_state
*st
= iio_dev_get_devdata(indio_dev
);
86 struct spi_transfer xfer
= {
93 mutex_lock(&st
->buf_lock
);
94 st
->tx
[0] = LIS3L02DQ_WRITE_REG(reg_address
);
97 spi_message_init(&msg
);
98 spi_message_add_tail(&xfer
, &msg
);
99 ret
= spi_sync(st
->us
, &msg
);
100 mutex_unlock(&st
->buf_lock
);
106 * lisl302dq_spi_write_reg_s16() - write 2 bytes to a pair of registers
107 * @dev: device associated with child of actual device (iio_dev or iio_trig)
108 * @reg_address: the address of the lower of the two registers. Second register
109 * is assumed to have address one greater.
110 * @val: value to be written
112 static int lis3l02dq_spi_write_reg_s16(struct device
*dev
,
113 u8 lower_reg_address
,
117 struct spi_message msg
;
118 struct iio_dev
*indio_dev
= dev_get_drvdata(dev
);
119 struct lis3l02dq_state
*st
= iio_dev_get_devdata(indio_dev
);
120 struct spi_transfer xfers
[] = { {
126 .tx_buf
= st
->tx
+ 2,
133 mutex_lock(&st
->buf_lock
);
134 st
->tx
[0] = LIS3L02DQ_WRITE_REG(lower_reg_address
);
135 st
->tx
[1] = value
& 0xFF;
136 st
->tx
[2] = LIS3L02DQ_WRITE_REG(lower_reg_address
+ 1);
137 st
->tx
[3] = (value
>> 8) & 0xFF;
139 spi_message_init(&msg
);
140 spi_message_add_tail(&xfers
[0], &msg
);
141 spi_message_add_tail(&xfers
[1], &msg
);
142 ret
= spi_sync(st
->us
, &msg
);
143 mutex_unlock(&st
->buf_lock
);
149 * lisl302dq_spi_read_reg_s16() - write 2 bytes to a pair of registers
150 * @dev: device associated with child of actual device (iio_dev or iio_trig)
151 * @reg_address: the address of the lower of the two registers. Second register
152 * is assumed to have address one greater.
153 * @val: somewhere to pass back the value read
155 static int lis3l02dq_spi_read_reg_s16(struct device
*dev
,
156 u8 lower_reg_address
,
159 struct spi_message msg
;
160 struct iio_dev
*indio_dev
= dev_get_drvdata(dev
);
161 struct lis3l02dq_state
*st
= iio_dev_get_devdata(indio_dev
);
163 struct spi_transfer xfers
[] = { {
170 .tx_buf
= st
->tx
+ 2,
171 .rx_buf
= st
->rx
+ 2,
179 mutex_lock(&st
->buf_lock
);
180 st
->tx
[0] = LIS3L02DQ_READ_REG(lower_reg_address
);
182 st
->tx
[2] = LIS3L02DQ_READ_REG(lower_reg_address
+1);
185 spi_message_init(&msg
);
186 spi_message_add_tail(&xfers
[0], &msg
);
187 spi_message_add_tail(&xfers
[1], &msg
);
188 ret
= spi_sync(st
->us
, &msg
);
190 dev_err(&st
->us
->dev
, "problem when reading 16 bit register");
193 *val
= (s16
)(st
->rx
[1]) | ((s16
)(st
->rx
[3]) << 8);
196 mutex_unlock(&st
->buf_lock
);
201 * lis3l02dq_read_signed() - attribute function used for 8 bit signed values
202 * @dev: the child device associated with the iio_dev or iio_trigger
203 * @attr: the attribute being processed
204 * @buf: buffer into which put the output string
206 static ssize_t
lis3l02dq_read_signed(struct device
*dev
,
207 struct device_attribute
*attr
,
212 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
214 ret
= lis3l02dq_spi_read_reg_8(dev
, this_attr
->address
, (u8
*)&val
);
216 return ret
? ret
: sprintf(buf
, "%d\n", val
);
219 static ssize_t
lis3l02dq_read_unsigned(struct device
*dev
,
220 struct device_attribute
*attr
,
225 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
227 ret
= lis3l02dq_spi_read_reg_8(dev
, this_attr
->address
, &val
);
229 return ret
? ret
: sprintf(buf
, "%d\n", val
);
232 static ssize_t
lis3l02dq_write_signed(struct device
*dev
,
233 struct device_attribute
*attr
,
240 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
242 ret
= strict_strtol(buf
, 10, &valin
);
246 ret
= lis3l02dq_spi_write_reg_8(dev
, this_attr
->address
, (u8
*)&val
);
249 return ret
? ret
: len
;
252 static ssize_t
lis3l02dq_write_unsigned(struct device
*dev
,
253 struct device_attribute
*attr
,
260 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
262 ret
= strict_strtoul(buf
, 10, &valin
);
266 ret
= lis3l02dq_spi_write_reg_8(dev
, this_attr
->address
, &val
);
269 return ret
? ret
: len
;
272 static ssize_t
lis3l02dq_read_16bit_signed(struct device
*dev
,
273 struct device_attribute
*attr
,
278 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
280 ret
= lis3l02dq_spi_read_reg_s16(dev
, this_attr
->address
, &val
);
285 return sprintf(buf
, "%d\n", val
);
288 static ssize_t
lis3l02dq_read_accel(struct device
*dev
,
289 struct device_attribute
*attr
,
292 struct iio_dev
*indio_dev
= dev_get_drvdata(dev
);
295 /* Take the iio_dev status lock */
296 mutex_lock(&indio_dev
->mlock
);
297 if (indio_dev
->currentmode
== INDIO_RING_TRIGGERED
)
298 ret
= lis3l02dq_read_accel_from_ring(dev
, attr
, buf
);
300 ret
= lis3l02dq_read_16bit_signed(dev
, attr
, buf
);
301 mutex_unlock(&indio_dev
->mlock
);
306 static ssize_t
lis3l02dq_write_16bit_signed(struct device
*dev
,
307 struct device_attribute
*attr
,
311 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
315 ret
= strict_strtol(buf
, 10, &val
);
318 ret
= lis3l02dq_spi_write_reg_s16(dev
, this_attr
->address
, val
);
321 return ret
? ret
: len
;
324 static ssize_t
lis3l02dq_read_frequency(struct device
*dev
,
325 struct device_attribute
*attr
,
330 ret
= lis3l02dq_spi_read_reg_8(dev
,
331 LIS3L02DQ_REG_CTRL_1_ADDR
,
335 t
&= LIS3L02DQ_DEC_MASK
;
337 case LIS3L02DQ_REG_CTRL_1_DF_128
:
338 len
= sprintf(buf
, "280\n");
340 case LIS3L02DQ_REG_CTRL_1_DF_64
:
341 len
= sprintf(buf
, "560\n");
343 case LIS3L02DQ_REG_CTRL_1_DF_32
:
344 len
= sprintf(buf
, "1120\n");
346 case LIS3L02DQ_REG_CTRL_1_DF_8
:
347 len
= sprintf(buf
, "4480\n");
353 static ssize_t
lis3l02dq_write_frequency(struct device
*dev
,
354 struct device_attribute
*attr
,
358 struct iio_dev
*indio_dev
= dev_get_drvdata(dev
);
363 ret
= strict_strtol(buf
, 10, &val
);
367 mutex_lock(&indio_dev
->mlock
);
368 ret
= lis3l02dq_spi_read_reg_8(dev
,
369 LIS3L02DQ_REG_CTRL_1_ADDR
,
372 goto error_ret_mutex
;
373 /* Wipe the bits clean */
374 t
&= ~LIS3L02DQ_DEC_MASK
;
377 t
|= LIS3L02DQ_REG_CTRL_1_DF_128
;
380 t
|= LIS3L02DQ_REG_CTRL_1_DF_64
;
383 t
|= LIS3L02DQ_REG_CTRL_1_DF_32
;
386 t
|= LIS3L02DQ_REG_CTRL_1_DF_8
;
390 goto error_ret_mutex
;
393 ret
= lis3l02dq_spi_write_reg_8(dev
,
394 LIS3L02DQ_REG_CTRL_1_ADDR
,
398 mutex_unlock(&indio_dev
->mlock
);
400 return ret
? ret
: len
;
403 static int lis3l02dq_initial_setup(struct lis3l02dq_state
*st
)
408 st
->us
->mode
= SPI_MODE_3
;
412 val
= LIS3L02DQ_DEFAULT_CTRL1
;
413 /* Write suitable defaults to ctrl1 */
414 ret
= lis3l02dq_spi_write_reg_8(&st
->indio_dev
->dev
,
415 LIS3L02DQ_REG_CTRL_1_ADDR
,
418 dev_err(&st
->us
->dev
, "problem with setup control register 1");
421 /* Repeat as sometimes doesn't work first time?*/
422 ret
= lis3l02dq_spi_write_reg_8(&st
->indio_dev
->dev
,
423 LIS3L02DQ_REG_CTRL_1_ADDR
,
426 dev_err(&st
->us
->dev
, "problem with setup control register 1");
430 /* Read back to check this has worked acts as loose test of correct
432 ret
= lis3l02dq_spi_read_reg_8(&st
->indio_dev
->dev
,
433 LIS3L02DQ_REG_CTRL_1_ADDR
,
435 if (ret
|| (valtest
!= val
)) {
436 dev_err(&st
->indio_dev
->dev
, "device not playing ball");
441 val
= LIS3L02DQ_DEFAULT_CTRL2
;
442 ret
= lis3l02dq_spi_write_reg_8(&st
->indio_dev
->dev
,
443 LIS3L02DQ_REG_CTRL_2_ADDR
,
446 dev_err(&st
->us
->dev
, "problem with setup control register 2");
450 val
= LIS3L02DQ_REG_WAKE_UP_CFG_LATCH_SRC
;
451 ret
= lis3l02dq_spi_write_reg_8(&st
->indio_dev
->dev
,
452 LIS3L02DQ_REG_WAKE_UP_CFG_ADDR
,
455 dev_err(&st
->us
->dev
, "problem with interrupt cfg register");
461 #define LIS3L02DQ_SIGNED_ATTR(name, reg) \
462 IIO_DEVICE_ATTR(name, \
464 lis3l02dq_read_signed, \
465 lis3l02dq_write_signed, \
468 #define LIS3L02DQ_UNSIGNED_ATTR(name, reg) \
469 IIO_DEVICE_ATTR(name, \
471 lis3l02dq_read_unsigned, \
472 lis3l02dq_write_unsigned, \
475 static LIS3L02DQ_SIGNED_ATTR(accel_x_calibbias
,
476 LIS3L02DQ_REG_OFFSET_X_ADDR
);
477 static LIS3L02DQ_SIGNED_ATTR(accel_y_calibbias
,
478 LIS3L02DQ_REG_OFFSET_Y_ADDR
);
479 static LIS3L02DQ_SIGNED_ATTR(accel_z_calibbias
,
480 LIS3L02DQ_REG_OFFSET_Z_ADDR
);
482 static LIS3L02DQ_UNSIGNED_ATTR(accel_x_calibscale
,
483 LIS3L02DQ_REG_GAIN_X_ADDR
);
484 static LIS3L02DQ_UNSIGNED_ATTR(accel_y_calibscale
,
485 LIS3L02DQ_REG_GAIN_Y_ADDR
);
486 static LIS3L02DQ_UNSIGNED_ATTR(accel_z_calibscale
,
487 LIS3L02DQ_REG_GAIN_Z_ADDR
);
489 static IIO_DEVICE_ATTR(accel_mag_either_rising_value
,
491 lis3l02dq_read_16bit_signed
,
492 lis3l02dq_write_16bit_signed
,
493 LIS3L02DQ_REG_THS_L_ADDR
);
494 /* RFC The reading method for these will change depending on whether
495 * ring buffer capture is in use. Is it worth making these take two
496 * functions and let the core handle which to call, or leave as in this
497 * driver where it is the drivers problem to manage this?
500 static IIO_DEV_ATTR_ACCEL_X(lis3l02dq_read_accel
,
501 LIS3L02DQ_REG_OUT_X_L_ADDR
);
503 static IIO_DEV_ATTR_ACCEL_Y(lis3l02dq_read_accel
,
504 LIS3L02DQ_REG_OUT_Y_L_ADDR
);
506 static IIO_DEV_ATTR_ACCEL_Z(lis3l02dq_read_accel
,
507 LIS3L02DQ_REG_OUT_Z_L_ADDR
);
509 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR
| S_IRUGO
,
510 lis3l02dq_read_frequency
,
511 lis3l02dq_write_frequency
);
513 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("280 560 1120 4480");
515 static ssize_t
lis3l02dq_read_interrupt_config(struct device
*dev
,
516 struct device_attribute
*attr
,
521 struct iio_event_attr
*this_attr
= to_iio_event_attr(attr
);
523 ret
= lis3l02dq_spi_read_reg_8(dev
->parent
,
524 LIS3L02DQ_REG_WAKE_UP_CFG_ADDR
,
527 return ret
? ret
: sprintf(buf
, "%d\n", !!(val
& this_attr
->mask
));
530 static ssize_t
lis3l02dq_write_interrupt_config(struct device
*dev
,
531 struct device_attribute
*attr
,
535 struct iio_event_attr
*this_attr
= to_iio_event_attr(attr
);
536 struct iio_dev
*indio_dev
= dev_get_drvdata(dev
);
537 int ret
, currentlyset
, changed
= 0;
538 u8 valold
, controlold
;
541 val
= !(buf
[0] == '0');
543 mutex_lock(&indio_dev
->mlock
);
544 /* read current value */
545 ret
= lis3l02dq_spi_read_reg_8(dev
->parent
,
546 LIS3L02DQ_REG_WAKE_UP_CFG_ADDR
,
549 goto error_mutex_unlock
;
551 /* read current control */
552 ret
= lis3l02dq_spi_read_reg_8(dev
,
553 LIS3L02DQ_REG_CTRL_2_ADDR
,
556 goto error_mutex_unlock
;
557 currentlyset
= !!(valold
& this_attr
->mask
);
558 if (val
== false && currentlyset
) {
559 valold
&= ~this_attr
->mask
;
561 iio_remove_event_from_list(this_attr
->listel
,
562 &indio_dev
->interrupts
[0]
564 } else if (val
== true && !currentlyset
) {
566 valold
|= this_attr
->mask
;
567 iio_add_event_to_list(this_attr
->listel
,
568 &indio_dev
->interrupts
[0]->ev_list
);
572 ret
= lis3l02dq_spi_write_reg_8(dev
,
573 LIS3L02DQ_REG_WAKE_UP_CFG_ADDR
,
576 goto error_mutex_unlock
;
577 /* This always enables the interrupt, even if we've remove the
578 * last thing using it. For this device we can use the reference
579 * count on the handler to tell us if anyone wants the interrupt
581 controlold
= this_attr
->listel
->refcount
?
582 (controlold
| LIS3L02DQ_REG_CTRL_2_ENABLE_INTERRUPT
) :
583 (controlold
& ~LIS3L02DQ_REG_CTRL_2_ENABLE_INTERRUPT
);
584 ret
= lis3l02dq_spi_write_reg_8(dev
,
585 LIS3L02DQ_REG_CTRL_2_ADDR
,
588 goto error_mutex_unlock
;
591 mutex_unlock(&indio_dev
->mlock
);
593 return ret
? ret
: len
;
597 static int lis3l02dq_thresh_handler_th(struct iio_dev
*dev_info
,
602 struct lis3l02dq_state
*st
= dev_info
->dev_data
;
604 /* Stash the timestamp somewhere convenient for the bh */
605 st
->last_timestamp
= timestamp
;
606 schedule_work(&st
->work_thresh
);
612 /* Unforunately it appears the interrupt won't clear unless you read from the
615 static void lis3l02dq_thresh_handler_bh_no_check(struct work_struct
*work_s
)
617 struct lis3l02dq_state
*st
618 = container_of(work_s
,
619 struct lis3l02dq_state
, work_thresh
);
623 lis3l02dq_spi_read_reg_8(&st
->indio_dev
->dev
,
624 LIS3L02DQ_REG_WAKE_UP_SRC_ADDR
,
627 if (t
& LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_Z_HIGH
)
628 iio_push_event(st
->indio_dev
, 0,
629 IIO_EVENT_CODE_ACCEL_Z_HIGH
,
632 if (t
& LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_Z_LOW
)
633 iio_push_event(st
->indio_dev
, 0,
634 IIO_EVENT_CODE_ACCEL_Z_LOW
,
637 if (t
& LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_Y_HIGH
)
638 iio_push_event(st
->indio_dev
, 0,
639 IIO_EVENT_CODE_ACCEL_Y_HIGH
,
642 if (t
& LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_Y_LOW
)
643 iio_push_event(st
->indio_dev
, 0,
644 IIO_EVENT_CODE_ACCEL_Y_LOW
,
647 if (t
& LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_X_HIGH
)
648 iio_push_event(st
->indio_dev
, 0,
649 IIO_EVENT_CODE_ACCEL_X_HIGH
,
652 if (t
& LIS3L02DQ_REG_WAKE_UP_SRC_INTERRUPT_X_LOW
)
653 iio_push_event(st
->indio_dev
, 0,
654 IIO_EVENT_CODE_ACCEL_X_LOW
,
656 /* reenable the irq */
657 enable_irq(st
->us
->irq
);
658 /* Ack and allow for new interrupts */
659 lis3l02dq_spi_read_reg_8(&st
->indio_dev
->dev
,
660 LIS3L02DQ_REG_WAKE_UP_ACK_ADDR
,
666 /* A shared handler for a number of threshold types */
667 IIO_EVENT_SH(threshold
, &lis3l02dq_thresh_handler_th
);
669 IIO_EVENT_ATTR_SH(accel_x_mag_pos_rising_en
,
671 lis3l02dq_read_interrupt_config
,
672 lis3l02dq_write_interrupt_config
,
673 LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_X_HIGH
);
675 IIO_EVENT_ATTR_SH(accel_y_mag_pos_rising_en
,
677 lis3l02dq_read_interrupt_config
,
678 lis3l02dq_write_interrupt_config
,
679 LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_Y_HIGH
);
681 IIO_EVENT_ATTR_SH(accel_z_mag_pos_rising_en
,
683 lis3l02dq_read_interrupt_config
,
684 lis3l02dq_write_interrupt_config
,
685 LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_Z_HIGH
);
687 IIO_EVENT_ATTR_SH(accel_x_mag_neg_rising_en
,
689 lis3l02dq_read_interrupt_config
,
690 lis3l02dq_write_interrupt_config
,
691 LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_X_LOW
);
693 IIO_EVENT_ATTR_SH(accel_y_mag_neg_rising_en
,
695 lis3l02dq_read_interrupt_config
,
696 lis3l02dq_write_interrupt_config
,
697 LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_Y_LOW
);
699 IIO_EVENT_ATTR_SH(accel_z_mag_neg_rising_en
,
701 lis3l02dq_read_interrupt_config
,
702 lis3l02dq_write_interrupt_config
,
703 LIS3L02DQ_REG_WAKE_UP_CFG_INTERRUPT_Z_LOW
);
706 static struct attribute
*lis3l02dq_event_attributes
[] = {
707 &iio_event_attr_accel_x_mag_pos_rising_en
.dev_attr
.attr
,
708 &iio_event_attr_accel_y_mag_pos_rising_en
.dev_attr
.attr
,
709 &iio_event_attr_accel_z_mag_pos_rising_en
.dev_attr
.attr
,
710 &iio_event_attr_accel_x_mag_neg_rising_en
.dev_attr
.attr
,
711 &iio_event_attr_accel_y_mag_neg_rising_en
.dev_attr
.attr
,
712 &iio_event_attr_accel_z_mag_neg_rising_en
.dev_attr
.attr
,
713 &iio_dev_attr_accel_mag_either_rising_value
.dev_attr
.attr
,
717 static struct attribute_group lis3l02dq_event_attribute_group
= {
718 .attrs
= lis3l02dq_event_attributes
,
721 static IIO_CONST_ATTR(name
, "lis3l02dq");
722 static IIO_CONST_ATTR(accel_scale
, "0.00958");
724 static struct attribute
*lis3l02dq_attributes
[] = {
725 &iio_dev_attr_accel_x_calibbias
.dev_attr
.attr
,
726 &iio_dev_attr_accel_y_calibbias
.dev_attr
.attr
,
727 &iio_dev_attr_accel_z_calibbias
.dev_attr
.attr
,
728 &iio_dev_attr_accel_x_calibscale
.dev_attr
.attr
,
729 &iio_dev_attr_accel_y_calibscale
.dev_attr
.attr
,
730 &iio_dev_attr_accel_z_calibscale
.dev_attr
.attr
,
731 &iio_const_attr_accel_scale
.dev_attr
.attr
,
732 &iio_dev_attr_accel_x_raw
.dev_attr
.attr
,
733 &iio_dev_attr_accel_y_raw
.dev_attr
.attr
,
734 &iio_dev_attr_accel_z_raw
.dev_attr
.attr
,
735 &iio_dev_attr_sampling_frequency
.dev_attr
.attr
,
736 &iio_const_attr_sampling_frequency_available
.dev_attr
.attr
,
737 &iio_const_attr_name
.dev_attr
.attr
,
741 static const struct attribute_group lis3l02dq_attribute_group
= {
742 .attrs
= lis3l02dq_attributes
,
745 static int __devinit
lis3l02dq_probe(struct spi_device
*spi
)
747 int ret
, regdone
= 0;
748 struct lis3l02dq_state
*st
= kzalloc(sizeof *st
, GFP_KERNEL
);
753 INIT_WORK(&st
->work_thresh
, lis3l02dq_thresh_handler_bh_no_check
);
754 /* this is only used tor removal purposes */
755 spi_set_drvdata(spi
, st
);
757 /* Allocate the comms buffers */
758 st
->rx
= kzalloc(sizeof(*st
->rx
)*LIS3L02DQ_MAX_RX
, GFP_KERNEL
);
759 if (st
->rx
== NULL
) {
763 st
->tx
= kzalloc(sizeof(*st
->tx
)*LIS3L02DQ_MAX_TX
, GFP_KERNEL
);
764 if (st
->tx
== NULL
) {
769 mutex_init(&st
->buf_lock
);
770 /* setup the industrialio driver allocated elements */
771 st
->indio_dev
= iio_allocate_device();
772 if (st
->indio_dev
== NULL
) {
777 st
->indio_dev
->dev
.parent
= &spi
->dev
;
778 st
->indio_dev
->num_interrupt_lines
= 1;
779 st
->indio_dev
->event_attrs
= &lis3l02dq_event_attribute_group
;
780 st
->indio_dev
->attrs
= &lis3l02dq_attribute_group
;
781 st
->indio_dev
->dev_data
= (void *)(st
);
782 st
->indio_dev
->driver_module
= THIS_MODULE
;
783 st
->indio_dev
->modes
= INDIO_DIRECT_MODE
;
785 ret
= lis3l02dq_configure_ring(st
->indio_dev
);
789 ret
= iio_device_register(st
->indio_dev
);
791 goto error_unreg_ring_funcs
;
794 ret
= lis3l02dq_initialize_ring(st
->indio_dev
->ring
);
796 printk(KERN_ERR
"failed to initialize the ring\n");
797 goto error_unreg_ring_funcs
;
800 if (spi
->irq
&& gpio_is_valid(irq_to_gpio(spi
->irq
)) > 0) {
802 ret
= iio_register_interrupt_line(spi
->irq
,
808 goto error_uninitialize_ring
;
810 ret
= lis3l02dq_probe_trigger(st
->indio_dev
);
812 goto error_unregister_line
;
815 /* Get the device into a sane initial state */
816 ret
= lis3l02dq_initial_setup(st
);
818 goto error_remove_trigger
;
821 error_remove_trigger
:
822 if (st
->indio_dev
->modes
& INDIO_RING_TRIGGERED
)
823 lis3l02dq_remove_trigger(st
->indio_dev
);
824 error_unregister_line
:
825 if (st
->indio_dev
->modes
& INDIO_RING_TRIGGERED
)
826 iio_unregister_interrupt_line(st
->indio_dev
, 0);
827 error_uninitialize_ring
:
828 lis3l02dq_uninitialize_ring(st
->indio_dev
->ring
);
829 error_unreg_ring_funcs
:
830 lis3l02dq_unconfigure_ring(st
->indio_dev
);
833 iio_device_unregister(st
->indio_dev
);
835 iio_free_device(st
->indio_dev
);
846 /* Power down the device */
847 static int lis3l02dq_stop_device(struct iio_dev
*indio_dev
)
850 struct lis3l02dq_state
*st
= indio_dev
->dev_data
;
853 mutex_lock(&indio_dev
->mlock
);
854 ret
= lis3l02dq_spi_write_reg_8(&indio_dev
->dev
,
855 LIS3L02DQ_REG_CTRL_1_ADDR
,
858 dev_err(&st
->us
->dev
, "problem with turning device off: ctrl1");
862 ret
= lis3l02dq_spi_write_reg_8(&indio_dev
->dev
,
863 LIS3L02DQ_REG_CTRL_2_ADDR
,
866 dev_err(&st
->us
->dev
, "problem with turning device off: ctrl2");
868 mutex_unlock(&indio_dev
->mlock
);
872 /* fixme, confirm ordering in this function */
873 static int lis3l02dq_remove(struct spi_device
*spi
)
876 struct lis3l02dq_state
*st
= spi_get_drvdata(spi
);
877 struct iio_dev
*indio_dev
= st
->indio_dev
;
879 ret
= lis3l02dq_stop_device(indio_dev
);
883 flush_scheduled_work();
885 lis3l02dq_remove_trigger(indio_dev
);
886 if (spi
->irq
&& gpio_is_valid(irq_to_gpio(spi
->irq
)) > 0)
887 iio_unregister_interrupt_line(indio_dev
, 0);
889 lis3l02dq_uninitialize_ring(indio_dev
->ring
);
890 lis3l02dq_unconfigure_ring(indio_dev
);
891 iio_device_unregister(indio_dev
);
902 static struct spi_driver lis3l02dq_driver
= {
905 .owner
= THIS_MODULE
,
907 .probe
= lis3l02dq_probe
,
908 .remove
= __devexit_p(lis3l02dq_remove
),
911 static __init
int lis3l02dq_init(void)
913 return spi_register_driver(&lis3l02dq_driver
);
915 module_init(lis3l02dq_init
);
917 static __exit
void lis3l02dq_exit(void)
919 spi_unregister_driver(&lis3l02dq_driver
);
921 module_exit(lis3l02dq_exit
);
923 MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>");
924 MODULE_DESCRIPTION("ST LIS3L02DQ Accelerometer SPI driver");
925 MODULE_LICENSE("GPL v2");