2 * ADIS16204 Programmable High-g Digital Impact Sensor and Recorder
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/delay.h>
12 #include <linux/mutex.h>
13 #include <linux/device.h>
14 #include <linux/kernel.h>
15 #include <linux/spi/spi.h>
16 #include <linux/slab.h>
17 #include <linux/sysfs.h>
18 #include <linux/list.h>
19 #include <linux/module.h>
21 #include <linux/iio/iio.h>
22 #include <linux/iio/sysfs.h>
23 #include <linux/iio/buffer.h>
25 #include "adis16204.h"
27 #define DRIVER_NAME "adis16204"
30 * adis16204_spi_write_reg_8() - write single byte to a register
31 * @dev: device associated with child of actual device (iio_dev or iio_trig)
32 * @reg_address: the address of the register to be written
33 * @val: the value to write
35 static int adis16204_spi_write_reg_8(struct iio_dev
*indio_dev
,
40 struct adis16204_state
*st
= iio_priv(indio_dev
);
42 mutex_lock(&st
->buf_lock
);
43 st
->tx
[0] = ADIS16204_WRITE_REG(reg_address
);
46 ret
= spi_write(st
->us
, st
->tx
, 2);
47 mutex_unlock(&st
->buf_lock
);
53 * adis16204_spi_write_reg_16() - write 2 bytes to a pair of registers
54 * @indio_dev: iio device associated with child of actual device
55 * @reg_address: the address of the lower of the two registers. Second register
56 * is assumed to have address one greater.
57 * @val: value to be written
59 static int adis16204_spi_write_reg_16(struct iio_dev
*indio_dev
,
64 struct spi_message msg
;
65 struct adis16204_state
*st
= iio_priv(indio_dev
);
66 struct spi_transfer xfers
[] = {
80 mutex_lock(&st
->buf_lock
);
81 st
->tx
[0] = ADIS16204_WRITE_REG(lower_reg_address
);
82 st
->tx
[1] = value
& 0xFF;
83 st
->tx
[2] = ADIS16204_WRITE_REG(lower_reg_address
+ 1);
84 st
->tx
[3] = (value
>> 8) & 0xFF;
86 spi_message_init(&msg
);
87 spi_message_add_tail(&xfers
[0], &msg
);
88 spi_message_add_tail(&xfers
[1], &msg
);
89 ret
= spi_sync(st
->us
, &msg
);
90 mutex_unlock(&st
->buf_lock
);
96 * adis16204_spi_read_reg_16() - read 2 bytes from a 16-bit register
97 * @indio_dev: iio device associated with child of actual device
98 * @reg_address: the address of the lower of the two registers. Second register
99 * is assumed to have address one greater.
100 * @val: somewhere to pass back the value read
102 static int adis16204_spi_read_reg_16(struct iio_dev
*indio_dev
,
103 u8 lower_reg_address
,
106 struct spi_message msg
;
107 struct adis16204_state
*st
= iio_priv(indio_dev
);
109 struct spi_transfer xfers
[] = {
124 mutex_lock(&st
->buf_lock
);
125 st
->tx
[0] = ADIS16204_READ_REG(lower_reg_address
);
128 spi_message_init(&msg
);
129 spi_message_add_tail(&xfers
[0], &msg
);
130 spi_message_add_tail(&xfers
[1], &msg
);
131 ret
= spi_sync(st
->us
, &msg
);
133 dev_err(&st
->us
->dev
, "problem when reading 16 bit register 0x%02X",
137 *val
= (st
->rx
[0] << 8) | st
->rx
[1];
140 mutex_unlock(&st
->buf_lock
);
144 static int adis16204_check_status(struct iio_dev
*indio_dev
)
149 ret
= adis16204_spi_read_reg_16(indio_dev
,
150 ADIS16204_DIAG_STAT
, &status
);
152 dev_err(&indio_dev
->dev
, "Reading status failed\n");
157 if (status
& ADIS16204_DIAG_STAT_SELFTEST_FAIL
)
158 dev_err(&indio_dev
->dev
, "Self test failure\n");
159 if (status
& ADIS16204_DIAG_STAT_SPI_FAIL
)
160 dev_err(&indio_dev
->dev
, "SPI failure\n");
161 if (status
& ADIS16204_DIAG_STAT_FLASH_UPT
)
162 dev_err(&indio_dev
->dev
, "Flash update failed\n");
163 if (status
& ADIS16204_DIAG_STAT_POWER_HIGH
)
164 dev_err(&indio_dev
->dev
, "Power supply above 3.625V\n");
165 if (status
& ADIS16204_DIAG_STAT_POWER_LOW
)
166 dev_err(&indio_dev
->dev
, "Power supply below 2.975V\n");
172 static int adis16204_reset(struct iio_dev
*indio_dev
)
175 ret
= adis16204_spi_write_reg_8(indio_dev
,
177 ADIS16204_GLOB_CMD_SW_RESET
);
179 dev_err(&indio_dev
->dev
, "problem resetting device");
184 int adis16204_set_irq(struct iio_dev
*indio_dev
, bool enable
)
189 ret
= adis16204_spi_read_reg_16(indio_dev
, ADIS16204_MSC_CTRL
, &msc
);
193 msc
|= ADIS16204_MSC_CTRL_ACTIVE_HIGH
;
194 msc
&= ~ADIS16204_MSC_CTRL_DATA_RDY_DIO2
;
196 msc
|= ADIS16204_MSC_CTRL_DATA_RDY_EN
;
198 msc
&= ~ADIS16204_MSC_CTRL_DATA_RDY_EN
;
200 ret
= adis16204_spi_write_reg_16(indio_dev
, ADIS16204_MSC_CTRL
, msc
);
206 static int adis16204_self_test(struct iio_dev
*indio_dev
)
209 ret
= adis16204_spi_write_reg_16(indio_dev
,
211 ADIS16204_MSC_CTRL_SELF_TEST_EN
);
213 dev_err(&indio_dev
->dev
, "problem starting self test");
217 adis16204_check_status(indio_dev
);
223 static int adis16204_initial_setup(struct iio_dev
*indio_dev
)
228 ret
= adis16204_set_irq(indio_dev
, false);
230 dev_err(&indio_dev
->dev
, "disable irq failed");
235 ret
= adis16204_self_test(indio_dev
);
237 dev_err(&indio_dev
->dev
, "self test failure");
241 /* Read status register to check the result */
242 ret
= adis16204_check_status(indio_dev
);
244 adis16204_reset(indio_dev
);
245 dev_err(&indio_dev
->dev
, "device not playing ball -> reset");
246 msleep(ADIS16204_STARTUP_DELAY
);
247 ret
= adis16204_check_status(indio_dev
);
249 dev_err(&indio_dev
->dev
, "giving up");
258 /* Unique to this driver currently */
260 enum adis16204_channel
{
269 static u8 adis16204_addresses
[6][3] = {
270 [in_supply
] = { ADIS16204_SUPPLY_OUT
},
271 [in_aux
] = { ADIS16204_AUX_ADC
},
272 [temp
] = { ADIS16204_TEMP_OUT
},
273 [accel_x
] = { ADIS16204_XACCL_OUT
, ADIS16204_XACCL_NULL
,
274 ADIS16204_X_PEAK_OUT
},
275 [accel_y
] = { ADIS16204_XACCL_OUT
, ADIS16204_YACCL_NULL
,
276 ADIS16204_Y_PEAK_OUT
},
277 [accel_xy
] = { ADIS16204_XY_RSS_OUT
, 0,
278 ADIS16204_XY_PEAK_OUT
},
281 static int adis16204_read_raw(struct iio_dev
*indio_dev
,
282 struct iio_chan_spec
const *chan
,
293 case IIO_CHAN_INFO_RAW
:
294 mutex_lock(&indio_dev
->mlock
);
295 addr
= adis16204_addresses
[chan
->address
][0];
296 ret
= adis16204_spi_read_reg_16(indio_dev
, addr
, &val16
);
298 mutex_unlock(&indio_dev
->mlock
);
302 if (val16
& ADIS16204_ERROR_ACTIVE
) {
303 ret
= adis16204_check_status(indio_dev
);
305 mutex_unlock(&indio_dev
->mlock
);
309 val16
= val16
& ((1 << chan
->scan_type
.realbits
) - 1);
310 if (chan
->scan_type
.sign
== 's')
311 val16
= (s16
)(val16
<<
312 (16 - chan
->scan_type
.realbits
)) >>
313 (16 - chan
->scan_type
.realbits
);
315 mutex_unlock(&indio_dev
->mlock
);
317 case IIO_CHAN_INFO_SCALE
:
318 switch (chan
->type
) {
321 if (chan
->channel
== 0)
325 return IIO_VAL_INT_PLUS_MICRO
;
329 return IIO_VAL_INT_PLUS_MICRO
;
332 switch (chan
->channel2
) {
334 case IIO_MOD_ROOT_SUM_SQUARED_X_Y
:
342 return IIO_VAL_INT_PLUS_MICRO
;
347 case IIO_CHAN_INFO_OFFSET
:
350 case IIO_CHAN_INFO_CALIBBIAS
:
351 case IIO_CHAN_INFO_PEAK
:
352 if (mask
== IIO_CHAN_INFO_CALIBBIAS
) {
355 } else { /* PEAK_SEPARATE */
359 mutex_lock(&indio_dev
->mlock
);
360 addr
= adis16204_addresses
[chan
->address
][addrind
];
361 ret
= adis16204_spi_read_reg_16(indio_dev
, addr
, &val16
);
363 mutex_unlock(&indio_dev
->mlock
);
366 val16
&= (1 << bits
) - 1;
367 val16
= (s16
)(val16
<< (16 - bits
)) >> (16 - bits
);
369 mutex_unlock(&indio_dev
->mlock
);
375 static int adis16204_write_raw(struct iio_dev
*indio_dev
,
376 struct iio_chan_spec
const *chan
,
385 case IIO_CHAN_INFO_CALIBBIAS
:
386 switch (chan
->type
) {
393 val16
= val
& ((1 << bits
) - 1);
394 addr
= adis16204_addresses
[chan
->address
][1];
395 return adis16204_spi_write_reg_16(indio_dev
, addr
, val16
);
400 static const struct iio_chan_spec adis16204_channels
[] = {
403 .indexed
= 1, /* Note was not previously indexed */
405 .extend_name
= "supply",
406 .info_mask
= IIO_CHAN_INFO_RAW_SEPARATE_BIT
|
407 IIO_CHAN_INFO_SCALE_SEPARATE_BIT
,
408 .address
= in_supply
,
409 .scan_index
= ADIS16204_SCAN_SUPPLY
,
419 .info_mask
= IIO_CHAN_INFO_RAW_SEPARATE_BIT
|
420 IIO_CHAN_INFO_SCALE_SEPARATE_BIT
,
422 .scan_index
= ADIS16204_SCAN_AUX_ADC
,
432 .info_mask
= IIO_CHAN_INFO_RAW_SEPARATE_BIT
|
433 IIO_CHAN_INFO_SCALE_SEPARATE_BIT
|
434 IIO_CHAN_INFO_OFFSET_SEPARATE_BIT
,
436 .scan_index
= ADIS16204_SCAN_TEMP
,
445 .channel2
= IIO_MOD_X
,
446 .info_mask
= IIO_CHAN_INFO_RAW_SEPARATE_BIT
|
447 IIO_CHAN_INFO_SCALE_SEPARATE_BIT
|
448 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT
|
449 IIO_CHAN_INFO_PEAK_SEPARATE_BIT
,
451 .scan_index
= ADIS16204_SCAN_ACC_X
,
460 .channel2
= IIO_MOD_Y
,
461 .info_mask
= IIO_CHAN_INFO_RAW_SEPARATE_BIT
|
462 IIO_CHAN_INFO_SCALE_SEPARATE_BIT
|
463 IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT
|
464 IIO_CHAN_INFO_PEAK_SEPARATE_BIT
,
466 .scan_index
= ADIS16204_SCAN_ACC_Y
,
473 IIO_CHAN_SOFT_TIMESTAMP(5),
477 .channel2
= IIO_MOD_ROOT_SUM_SQUARED_X_Y
,
478 .info_mask
= IIO_CHAN_INFO_RAW_SEPARATE_BIT
|
479 IIO_CHAN_INFO_SCALE_SEPARATE_BIT
|
480 IIO_CHAN_INFO_PEAK_SEPARATE_BIT
,
490 static const struct iio_info adis16204_info
= {
491 .read_raw
= &adis16204_read_raw
,
492 .write_raw
= &adis16204_write_raw
,
493 .driver_module
= THIS_MODULE
,
496 static int __devinit
adis16204_probe(struct spi_device
*spi
)
499 struct adis16204_state
*st
;
500 struct iio_dev
*indio_dev
;
502 /* setup the industrialio driver allocated elements */
503 indio_dev
= iio_device_alloc(sizeof(*st
));
504 if (indio_dev
== NULL
) {
508 st
= iio_priv(indio_dev
);
509 /* this is only used for removal purposes */
510 spi_set_drvdata(spi
, indio_dev
);
512 mutex_init(&st
->buf_lock
);
514 indio_dev
->name
= spi
->dev
.driver
->name
;
515 indio_dev
->dev
.parent
= &spi
->dev
;
516 indio_dev
->info
= &adis16204_info
;
517 indio_dev
->channels
= adis16204_channels
;
518 indio_dev
->num_channels
= ARRAY_SIZE(adis16204_channels
);
519 indio_dev
->modes
= INDIO_DIRECT_MODE
;
521 ret
= adis16204_configure_ring(indio_dev
);
525 ret
= iio_buffer_register(indio_dev
,
529 printk(KERN_ERR
"failed to initialize the ring\n");
530 goto error_unreg_ring_funcs
;
534 ret
= adis16204_probe_trigger(indio_dev
);
536 goto error_uninitialize_ring
;
539 /* Get the device into a sane initial state */
540 ret
= adis16204_initial_setup(indio_dev
);
542 goto error_remove_trigger
;
543 ret
= iio_device_register(indio_dev
);
545 goto error_remove_trigger
;
549 error_remove_trigger
:
550 adis16204_remove_trigger(indio_dev
);
551 error_uninitialize_ring
:
552 iio_buffer_unregister(indio_dev
);
553 error_unreg_ring_funcs
:
554 adis16204_unconfigure_ring(indio_dev
);
556 iio_device_free(indio_dev
);
561 static int __devexit
adis16204_remove(struct spi_device
*spi
)
563 struct iio_dev
*indio_dev
= spi_get_drvdata(spi
);
565 iio_device_unregister(indio_dev
);
566 adis16204_remove_trigger(indio_dev
);
567 iio_buffer_unregister(indio_dev
);
568 adis16204_unconfigure_ring(indio_dev
);
569 iio_device_free(indio_dev
);
574 static struct spi_driver adis16204_driver
= {
577 .owner
= THIS_MODULE
,
579 .probe
= adis16204_probe
,
580 .remove
= __devexit_p(adis16204_remove
),
582 module_spi_driver(adis16204_driver
);
584 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
585 MODULE_DESCRIPTION("ADIS16204 High-g Digital Impact Sensor and Recorder");
586 MODULE_LICENSE("GPL v2");
587 MODULE_ALIAS("spi:adis16204");