2 * ADIS16240 Programmable Impact Sensor and Recorder driver
4 * Copyright 2010 Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
9 #include <linux/interrupt.h>
10 #include <linux/irq.h>
11 #include <linux/gpio.h>
12 #include <linux/delay.h>
13 #include <linux/mutex.h>
14 #include <linux/device.h>
15 #include <linux/kernel.h>
16 #include <linux/spi/spi.h>
17 #include <linux/slab.h>
18 #include <linux/sysfs.h>
19 #include <linux/list.h>
20 #include <linux/module.h>
24 #include "../ring_generic.h"
26 #include "adis16240.h"
28 #define DRIVER_NAME "adis16240"
30 static int adis16240_check_status(struct iio_dev
*indio_dev
);
33 * adis16240_spi_write_reg_8() - write single byte to a register
34 * @indio_dev: iio_dev associated with device
35 * @reg_address: the address of the register to be written
36 * @val: the value to write
38 static int adis16240_spi_write_reg_8(struct iio_dev
*indio_dev
,
43 struct adis16240_state
*st
= iio_priv(indio_dev
);
45 mutex_lock(&st
->buf_lock
);
46 st
->tx
[0] = ADIS16240_WRITE_REG(reg_address
);
49 ret
= spi_write(st
->us
, st
->tx
, 2);
50 mutex_unlock(&st
->buf_lock
);
56 * adis16240_spi_write_reg_16() - write 2 bytes to a pair of registers
57 * @indio_dev: iio_dev for this device
58 * @reg_address: the address of the lower of the two registers. Second register
59 * is assumed to have address one greater.
60 * @val: value to be written
62 static int adis16240_spi_write_reg_16(struct iio_dev
*indio_dev
,
67 struct spi_message msg
;
68 struct adis16240_state
*st
= iio_priv(indio_dev
);
69 struct spi_transfer xfers
[] = {
84 mutex_lock(&st
->buf_lock
);
85 st
->tx
[0] = ADIS16240_WRITE_REG(lower_reg_address
);
86 st
->tx
[1] = value
& 0xFF;
87 st
->tx
[2] = ADIS16240_WRITE_REG(lower_reg_address
+ 1);
88 st
->tx
[3] = (value
>> 8) & 0xFF;
90 spi_message_init(&msg
);
91 spi_message_add_tail(&xfers
[0], &msg
);
92 spi_message_add_tail(&xfers
[1], &msg
);
93 ret
= spi_sync(st
->us
, &msg
);
94 mutex_unlock(&st
->buf_lock
);
100 * adis16240_spi_read_reg_16() - read 2 bytes from a 16-bit register
101 * @indio_dev: iio_dev for this device
102 * @reg_address: the address of the lower of the two registers. Second register
103 * is assumed to have address one greater.
104 * @val: somewhere to pass back the value read
106 static int adis16240_spi_read_reg_16(struct iio_dev
*indio_dev
,
107 u8 lower_reg_address
,
110 struct spi_message msg
;
111 struct adis16240_state
*st
= iio_priv(indio_dev
);
113 struct spi_transfer xfers
[] = {
129 mutex_lock(&st
->buf_lock
);
130 st
->tx
[0] = ADIS16240_READ_REG(lower_reg_address
);
135 spi_message_init(&msg
);
136 spi_message_add_tail(&xfers
[0], &msg
);
137 spi_message_add_tail(&xfers
[1], &msg
);
138 ret
= spi_sync(st
->us
, &msg
);
140 dev_err(&st
->us
->dev
,
141 "problem when reading 16 bit register 0x%02X",
145 *val
= (st
->rx
[0] << 8) | st
->rx
[1];
148 mutex_unlock(&st
->buf_lock
);
152 static ssize_t
adis16240_spi_read_signed(struct device
*dev
,
153 struct device_attribute
*attr
,
157 struct iio_dev
*indio_dev
= dev_get_drvdata(dev
);
160 unsigned shift
= 16 - bits
;
161 struct iio_dev_attr
*this_attr
= to_iio_dev_attr(attr
);
163 ret
= adis16240_spi_read_reg_16(indio_dev
,
164 this_attr
->address
, (u16
*)&val
);
168 if (val
& ADIS16240_ERROR_ACTIVE
)
169 adis16240_check_status(indio_dev
);
171 val
= ((s16
)(val
<< shift
) >> shift
);
172 return sprintf(buf
, "%d\n", val
);
175 static ssize_t
adis16240_read_12bit_signed(struct device
*dev
,
176 struct device_attribute
*attr
,
180 struct iio_dev
*indio_dev
= dev_get_drvdata(dev
);
182 /* Take the iio_dev status lock */
183 mutex_lock(&indio_dev
->mlock
);
184 ret
= adis16240_spi_read_signed(dev
, attr
, buf
, 12);
185 mutex_unlock(&indio_dev
->mlock
);
190 static int adis16240_reset(struct iio_dev
*indio_dev
)
193 ret
= adis16240_spi_write_reg_8(indio_dev
,
195 ADIS16240_GLOB_CMD_SW_RESET
);
197 dev_err(&indio_dev
->dev
, "problem resetting device");
202 static ssize_t
adis16240_write_reset(struct device
*dev
,
203 struct device_attribute
*attr
,
204 const char *buf
, size_t len
)
206 struct iio_dev
*indio_dev
= dev_get_drvdata(dev
);
214 return adis16240_reset(indio_dev
);
219 int adis16240_set_irq(struct iio_dev
*indio_dev
, bool enable
)
224 ret
= adis16240_spi_read_reg_16(indio_dev
,
225 ADIS16240_MSC_CTRL
, &msc
);
229 msc
|= ADIS16240_MSC_CTRL_ACTIVE_HIGH
;
230 msc
&= ~ADIS16240_MSC_CTRL_DATA_RDY_DIO2
;
232 msc
|= ADIS16240_MSC_CTRL_DATA_RDY_EN
;
234 msc
&= ~ADIS16240_MSC_CTRL_DATA_RDY_EN
;
236 ret
= adis16240_spi_write_reg_16(indio_dev
,
237 ADIS16240_MSC_CTRL
, msc
);
243 static int adis16240_self_test(struct iio_dev
*indio_dev
)
246 ret
= adis16240_spi_write_reg_16(indio_dev
,
248 ADIS16240_MSC_CTRL_SELF_TEST_EN
);
250 dev_err(&indio_dev
->dev
, "problem starting self test");
254 msleep(ADIS16240_STARTUP_DELAY
);
256 adis16240_check_status(indio_dev
);
262 static int adis16240_check_status(struct iio_dev
*indio_dev
)
266 struct device
*dev
= &indio_dev
->dev
;
268 ret
= adis16240_spi_read_reg_16(indio_dev
,
269 ADIS16240_DIAG_STAT
, &status
);
272 dev_err(dev
, "Reading status failed\n");
277 if (status
& ADIS16240_DIAG_STAT_PWRON_FAIL
)
278 dev_err(dev
, "Power-on, self-test fail\n");
279 if (status
& ADIS16240_DIAG_STAT_SPI_FAIL
)
280 dev_err(dev
, "SPI failure\n");
281 if (status
& ADIS16240_DIAG_STAT_FLASH_UPT
)
282 dev_err(dev
, "Flash update failed\n");
283 if (status
& ADIS16240_DIAG_STAT_POWER_HIGH
)
284 dev_err(dev
, "Power supply above 3.625V\n");
285 if (status
& ADIS16240_DIAG_STAT_POWER_LOW
)
286 dev_err(dev
, "Power supply below 2.225V\n");
292 static int adis16240_initial_setup(struct iio_dev
*indio_dev
)
295 struct device
*dev
= &indio_dev
->dev
;
298 ret
= adis16240_set_irq(indio_dev
, false);
300 dev_err(dev
, "disable irq failed");
305 ret
= adis16240_self_test(indio_dev
);
307 dev_err(dev
, "self test failure");
311 /* Read status register to check the result */
312 ret
= adis16240_check_status(indio_dev
);
314 adis16240_reset(indio_dev
);
315 dev_err(dev
, "device not playing ball -> reset");
316 msleep(ADIS16240_STARTUP_DELAY
);
317 ret
= adis16240_check_status(indio_dev
);
319 dev_err(dev
, "giving up");
328 static IIO_DEVICE_ATTR(accel_xyz_squared_peak_raw
, S_IRUGO
,
329 adis16240_read_12bit_signed
, NULL
,
330 ADIS16240_XYZPEAK_OUT
);
332 static IIO_DEVICE_ATTR(reset
, S_IWUSR
, NULL
, adis16240_write_reset
, 0);
334 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("4096");
336 enum adis16240_chan
{
345 static const u8 adis16240_addresses
[6][3] = {
346 [in_supply
] = { ADIS16240_SUPPLY_OUT
},
347 [in_aux
] = { ADIS16240_AUX_ADC
},
348 [accel_x
] = { ADIS16240_XACCL_OUT
, ADIS16240_XACCL_OFF
,
349 ADIS16240_XPEAK_OUT
},
350 [accel_y
] = { ADIS16240_YACCL_OUT
, ADIS16240_YACCL_OFF
,
351 ADIS16240_YPEAK_OUT
},
352 [accel_z
] = { ADIS16240_ZACCL_OUT
, ADIS16240_ZACCL_OFF
,
353 ADIS16240_ZPEAK_OUT
},
354 [temp
] = { ADIS16240_TEMP_OUT
},
357 static int adis16240_read_raw(struct iio_dev
*indio_dev
,
358 struct iio_chan_spec
const *chan
,
369 mutex_lock(&indio_dev
->mlock
);
370 addr
= adis16240_addresses
[chan
->address
][0];
371 ret
= adis16240_spi_read_reg_16(indio_dev
, addr
, &val16
);
373 mutex_unlock(&indio_dev
->mlock
);
377 if (val16
& ADIS16240_ERROR_ACTIVE
) {
378 ret
= adis16240_check_status(indio_dev
);
380 mutex_unlock(&indio_dev
->mlock
);
384 val16
= val16
& ((1 << chan
->scan_type
.realbits
) - 1);
385 if (chan
->scan_type
.sign
== 's')
386 val16
= (s16
)(val16
<<
387 (16 - chan
->scan_type
.realbits
)) >>
388 (16 - chan
->scan_type
.realbits
);
390 mutex_unlock(&indio_dev
->mlock
);
392 case (1 << IIO_CHAN_INFO_SCALE_SEPARATE
):
393 case (1 << IIO_CHAN_INFO_SCALE_SHARED
):
394 switch (chan
->type
) {
397 if (chan
->channel
== 0)
401 return IIO_VAL_INT_PLUS_MICRO
;
405 return IIO_VAL_INT_PLUS_MICRO
;
409 return IIO_VAL_INT_PLUS_MICRO
;
414 case (1 << IIO_CHAN_INFO_PEAK_SCALE_SHARED
):
417 return IIO_VAL_INT_PLUS_MICRO
;
418 case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE
):
421 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE
):
423 mutex_lock(&indio_dev
->mlock
);
424 addr
= adis16240_addresses
[chan
->address
][1];
425 ret
= adis16240_spi_read_reg_16(indio_dev
, addr
, &val16
);
427 mutex_unlock(&indio_dev
->mlock
);
430 val16
&= (1 << bits
) - 1;
431 val16
= (s16
)(val16
<< (16 - bits
)) >> (16 - bits
);
433 mutex_unlock(&indio_dev
->mlock
);
435 case (1 << IIO_CHAN_INFO_PEAK_SEPARATE
):
437 mutex_lock(&indio_dev
->mlock
);
438 addr
= adis16240_addresses
[chan
->address
][2];
439 ret
= adis16240_spi_read_reg_16(indio_dev
, addr
, &val16
);
441 mutex_unlock(&indio_dev
->mlock
);
444 val16
&= (1 << bits
) - 1;
445 val16
= (s16
)(val16
<< (16 - bits
)) >> (16 - bits
);
447 mutex_unlock(&indio_dev
->mlock
);
453 static int adis16240_write_raw(struct iio_dev
*indio_dev
,
454 struct iio_chan_spec
const *chan
,
463 case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE
):
464 val16
= val
& ((1 << bits
) - 1);
465 addr
= adis16240_addresses
[chan
->address
][1];
466 return adis16240_spi_write_reg_16(indio_dev
, addr
, val16
);
471 static struct iio_chan_spec adis16240_channels
[] = {
472 IIO_CHAN(IIO_IN
, 0, 1, 0, "supply", 0, 0,
473 (1 << IIO_CHAN_INFO_SCALE_SEPARATE
),
474 in_supply
, ADIS16240_SCAN_SUPPLY
,
475 IIO_ST('u', 10, 16, 0), 0),
476 IIO_CHAN(IIO_IN
, 0, 1, 0, NULL
, 1, 0,
478 in_aux
, ADIS16240_SCAN_AUX_ADC
,
479 IIO_ST('u', 10, 16, 0), 0),
480 IIO_CHAN(IIO_ACCEL
, 1, 0, 0, NULL
, 0, IIO_MOD_X
,
481 (1 << IIO_CHAN_INFO_SCALE_SHARED
) |
482 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE
),
483 accel_x
, ADIS16240_SCAN_ACC_X
,
484 IIO_ST('s', 10, 16, 0), 0),
485 IIO_CHAN(IIO_ACCEL
, 1, 0, 0, NULL
, 0, IIO_MOD_Y
,
486 (1 << IIO_CHAN_INFO_SCALE_SHARED
) |
487 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE
),
488 accel_y
, ADIS16240_SCAN_ACC_Y
,
489 IIO_ST('s', 10, 16, 0), 0),
490 IIO_CHAN(IIO_ACCEL
, 1, 0, 0, NULL
, 0, IIO_MOD_Z
,
491 (1 << IIO_CHAN_INFO_SCALE_SHARED
) |
492 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE
),
493 accel_z
, ADIS16240_SCAN_ACC_Z
,
494 IIO_ST('s', 10, 16, 0), 0),
495 IIO_CHAN(IIO_TEMP
, 0, 1, 0, NULL
, 0, 0,
496 (1 << IIO_CHAN_INFO_SCALE_SEPARATE
),
497 temp
, ADIS16240_SCAN_TEMP
,
498 IIO_ST('u', 10, 16, 0), 0),
499 IIO_CHAN_SOFT_TIMESTAMP(6)
502 static struct attribute
*adis16240_attributes
[] = {
503 &iio_dev_attr_accel_xyz_squared_peak_raw
.dev_attr
.attr
,
504 &iio_const_attr_sampling_frequency_available
.dev_attr
.attr
,
505 &iio_dev_attr_reset
.dev_attr
.attr
,
509 static const struct attribute_group adis16240_attribute_group
= {
510 .attrs
= adis16240_attributes
,
513 static const struct iio_info adis16240_info
= {
514 .attrs
= &adis16240_attribute_group
,
515 .read_raw
= &adis16240_read_raw
,
516 .write_raw
= &adis16240_write_raw
,
517 .driver_module
= THIS_MODULE
,
520 static int __devinit
adis16240_probe(struct spi_device
*spi
)
522 int ret
, regdone
= 0;
523 struct adis16240_state
*st
;
524 struct iio_dev
*indio_dev
;
526 /* setup the industrialio driver allocated elements */
527 indio_dev
= iio_allocate_device(sizeof(*st
));
528 if (indio_dev
== NULL
) {
532 st
= iio_priv(indio_dev
);
533 /* this is only used for removal purposes */
534 spi_set_drvdata(spi
, indio_dev
);
537 mutex_init(&st
->buf_lock
);
539 indio_dev
->name
= spi
->dev
.driver
->name
;
540 indio_dev
->dev
.parent
= &spi
->dev
;
541 indio_dev
->info
= &adis16240_info
;
542 indio_dev
->channels
= adis16240_channels
;
543 indio_dev
->num_channels
= ARRAY_SIZE(adis16240_channels
);
544 indio_dev
->modes
= INDIO_DIRECT_MODE
;
546 ret
= adis16240_configure_ring(indio_dev
);
550 ret
= iio_device_register(indio_dev
);
552 goto error_unreg_ring_funcs
;
555 ret
= iio_ring_buffer_register_ex(indio_dev
->ring
, 0,
557 ARRAY_SIZE(adis16240_channels
));
559 printk(KERN_ERR
"failed to initialize the ring\n");
560 goto error_unreg_ring_funcs
;
564 ret
= adis16240_probe_trigger(indio_dev
);
566 goto error_uninitialize_ring
;
569 /* Get the device into a sane initial state */
570 ret
= adis16240_initial_setup(indio_dev
);
572 goto error_remove_trigger
;
575 error_remove_trigger
:
576 adis16240_remove_trigger(indio_dev
);
577 error_uninitialize_ring
:
578 iio_ring_buffer_unregister(indio_dev
->ring
);
579 error_unreg_ring_funcs
:
580 adis16240_unconfigure_ring(indio_dev
);
583 iio_device_unregister(indio_dev
);
585 iio_free_device(indio_dev
);
590 static int adis16240_remove(struct spi_device
*spi
)
593 struct iio_dev
*indio_dev
= spi_get_drvdata(spi
);
595 flush_scheduled_work();
597 adis16240_remove_trigger(indio_dev
);
598 iio_ring_buffer_unregister(indio_dev
->ring
);
599 iio_device_unregister(indio_dev
);
600 adis16240_unconfigure_ring(indio_dev
);
605 static struct spi_driver adis16240_driver
= {
608 .owner
= THIS_MODULE
,
610 .probe
= adis16240_probe
,
611 .remove
= __devexit_p(adis16240_remove
),
614 static __init
int adis16240_init(void)
616 return spi_register_driver(&adis16240_driver
);
618 module_init(adis16240_init
);
620 static __exit
void adis16240_exit(void)
622 spi_unregister_driver(&adis16240_driver
);
624 module_exit(adis16240_exit
);
626 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
627 MODULE_DESCRIPTION("Analog Devices Programmable Impact Sensor and Recorder");
628 MODULE_LICENSE("GPL v2");