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/drivers/staging/iio/accel/adis16204_core.c

https://bitbucket.org/slukk/jb-tsm-kernel-4.2
C | 611 lines | 509 code | 68 blank | 34 comment | 48 complexity | 22d0480e9d5508c61ab560c61bcc719e MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/*
  2 * ADIS16204 Programmable High-g Digital Impact Sensor and Recorder
  3 *
  4 * Copyright 2010 Analog Devices Inc.
  5 *
  6 * Licensed under the GPL-2 or later.
  7 */
  8
  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
 21#include "../iio.h"
 22#include "../sysfs.h"
 23#include "../ring_generic.h"
 24#include "accel.h"
 25#include "../adc/adc.h"
 26
 27#include "adis16204.h"
 28
 29#define DRIVER_NAME		"adis16204"
 30
 31/**
 32 * adis16204_spi_write_reg_8() - write single byte to a register
 33 * @dev: device associated with child of actual device (iio_dev or iio_trig)
 34 * @reg_address: the address of the register to be written
 35 * @val: the value to write
 36 **/
 37static int adis16204_spi_write_reg_8(struct iio_dev *indio_dev,
 38		u8 reg_address,
 39		u8 val)
 40{
 41	int ret;
 42	struct adis16204_state *st = iio_dev_get_devdata(indio_dev);
 43
 44	mutex_lock(&st->buf_lock);
 45	st->tx[0] = ADIS16204_WRITE_REG(reg_address);
 46	st->tx[1] = val;
 47
 48	ret = spi_write(st->us, st->tx, 2);
 49	mutex_unlock(&st->buf_lock);
 50
 51	return ret;
 52}
 53
 54/**
 55 * adis16204_spi_write_reg_16() - write 2 bytes to a pair of registers
 56 * @indio_dev: iio device associated with child of actual device
 57 * @reg_address: the address of the lower of the two registers. Second register
 58 *               is assumed to have address one greater.
 59 * @val: value to be written
 60 **/
 61static int adis16204_spi_write_reg_16(struct iio_dev *indio_dev,
 62		u8 lower_reg_address,
 63		u16 value)
 64{
 65	int ret;
 66	struct spi_message msg;
 67	struct adis16204_state *st = iio_dev_get_devdata(indio_dev);
 68	struct spi_transfer xfers[] = {
 69		{
 70			.tx_buf = st->tx,
 71			.bits_per_word = 8,
 72			.len = 2,
 73			.cs_change = 1,
 74		}, {
 75			.tx_buf = st->tx + 2,
 76			.bits_per_word = 8,
 77			.len = 2,
 78			.cs_change = 1,
 79		},
 80	};
 81
 82	mutex_lock(&st->buf_lock);
 83	st->tx[0] = ADIS16204_WRITE_REG(lower_reg_address);
 84	st->tx[1] = value & 0xFF;
 85	st->tx[2] = ADIS16204_WRITE_REG(lower_reg_address + 1);
 86	st->tx[3] = (value >> 8) & 0xFF;
 87
 88	spi_message_init(&msg);
 89	spi_message_add_tail(&xfers[0], &msg);
 90	spi_message_add_tail(&xfers[1], &msg);
 91	ret = spi_sync(st->us, &msg);
 92	mutex_unlock(&st->buf_lock);
 93
 94	return ret;
 95}
 96
 97/**
 98 * adis16204_spi_read_reg_16() - read 2 bytes from a 16-bit register
 99 * @indio_dev: iio device associated with child of actual device
100 * @reg_address: the address of the lower of the two registers. Second register
101 *               is assumed to have address one greater.
102 * @val: somewhere to pass back the value read
103 **/
104static int adis16204_spi_read_reg_16(struct iio_dev *indio_dev,
105				     u8 lower_reg_address,
106				     u16 *val)
107{
108	struct spi_message msg;
109	struct adis16204_state *st = iio_dev_get_devdata(indio_dev);
110	int ret;
111	struct spi_transfer xfers[] = {
112		{
113			.tx_buf = st->tx,
114			.bits_per_word = 8,
115			.len = 2,
116			.cs_change = 1,
117			.delay_usecs = 20,
118		}, {
119			.rx_buf = st->rx,
120			.bits_per_word = 8,
121			.len = 2,
122			.delay_usecs = 20,
123		},
124	};
125
126	mutex_lock(&st->buf_lock);
127	st->tx[0] = ADIS16204_READ_REG(lower_reg_address);
128	st->tx[1] = 0;
129
130	spi_message_init(&msg);
131	spi_message_add_tail(&xfers[0], &msg);
132	spi_message_add_tail(&xfers[1], &msg);
133	ret = spi_sync(st->us, &msg);
134	if (ret) {
135		dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
136				lower_reg_address);
137		goto error_ret;
138	}
139	*val = (st->rx[0] << 8) | st->rx[1];
140
141error_ret:
142	mutex_unlock(&st->buf_lock);
143	return ret;
144}
145
146static int adis16204_check_status(struct iio_dev *indio_dev)
147{
148	u16 status;
149	int ret;
150
151	ret = adis16204_spi_read_reg_16(indio_dev,
152					ADIS16204_DIAG_STAT, &status);
153	if (ret < 0) {
154		dev_err(&indio_dev->dev, "Reading status failed\n");
155		goto error_ret;
156	}
157	ret = status & 0x1F;
158
159	if (status & ADIS16204_DIAG_STAT_SELFTEST_FAIL)
160		dev_err(&indio_dev->dev, "Self test failure\n");
161	if (status & ADIS16204_DIAG_STAT_SPI_FAIL)
162		dev_err(&indio_dev->dev, "SPI failure\n");
163	if (status & ADIS16204_DIAG_STAT_FLASH_UPT)
164		dev_err(&indio_dev->dev, "Flash update failed\n");
165	if (status & ADIS16204_DIAG_STAT_POWER_HIGH)
166		dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
167	if (status & ADIS16204_DIAG_STAT_POWER_LOW)
168		dev_err(&indio_dev->dev, "Power supply below 2.975V\n");
169
170error_ret:
171	return ret;
172}
173
174static ssize_t adis16204_read_14bit_signed(struct device *dev,
175		struct device_attribute *attr,
176		char *buf)
177{
178	struct iio_dev *indio_dev = dev_get_drvdata(dev);
179	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
180	s16 val = 0;
181	ssize_t ret;
182
183	mutex_lock(&indio_dev->mlock);
184
185	ret = adis16204_spi_read_reg_16(indio_dev,
186					this_attr->address, (u16 *)&val);
187	if (!ret) {
188		if (val & ADIS16204_ERROR_ACTIVE)
189			adis16204_check_status(indio_dev);
190
191		val = ((s16)(val << 2) >> 2);
192		ret = sprintf(buf, "%d\n", val);
193	}
194
195	mutex_unlock(&indio_dev->mlock);
196
197	return ret;
198}
199
200static int adis16204_reset(struct iio_dev *indio_dev)
201{
202	int ret;
203	ret = adis16204_spi_write_reg_8(indio_dev,
204			ADIS16204_GLOB_CMD,
205			ADIS16204_GLOB_CMD_SW_RESET);
206	if (ret)
207		dev_err(&indio_dev->dev, "problem resetting device");
208
209	return ret;
210}
211
212static ssize_t adis16204_write_reset(struct device *dev,
213		struct device_attribute *attr,
214		const char *buf, size_t len)
215{
216	struct iio_dev *indio_dev = dev_get_drvdata(dev);
217
218	if (len < 1)
219		return -EINVAL;
220	switch (buf[0]) {
221	case '1':
222	case 'y':
223	case 'Y':
224		return adis16204_reset(indio_dev);
225	}
226	return -EINVAL;
227}
228
229int adis16204_set_irq(struct iio_dev *indio_dev, bool enable)
230{
231	int ret = 0;
232	u16 msc;
233
234	ret = adis16204_spi_read_reg_16(indio_dev, ADIS16204_MSC_CTRL, &msc);
235	if (ret)
236		goto error_ret;
237
238	msc |= ADIS16204_MSC_CTRL_ACTIVE_HIGH;
239	msc &= ~ADIS16204_MSC_CTRL_DATA_RDY_DIO2;
240	if (enable)
241		msc |= ADIS16204_MSC_CTRL_DATA_RDY_EN;
242	else
243		msc &= ~ADIS16204_MSC_CTRL_DATA_RDY_EN;
244
245	ret = adis16204_spi_write_reg_16(indio_dev, ADIS16204_MSC_CTRL, msc);
246
247error_ret:
248	return ret;
249}
250
251static int adis16204_self_test(struct iio_dev *indio_dev)
252{
253	int ret;
254	ret = adis16204_spi_write_reg_16(indio_dev,
255			ADIS16204_MSC_CTRL,
256			ADIS16204_MSC_CTRL_SELF_TEST_EN);
257	if (ret) {
258		dev_err(&indio_dev->dev, "problem starting self test");
259		goto err_ret;
260	}
261
262	adis16204_check_status(indio_dev);
263
264err_ret:
265	return ret;
266}
267
268static int adis16204_initial_setup(struct iio_dev *indio_dev)
269{
270	int ret;
271
272	/* Disable IRQ */
273	ret = adis16204_set_irq(indio_dev, false);
274	if (ret) {
275		dev_err(&indio_dev->dev, "disable irq failed");
276		goto err_ret;
277	}
278
279	/* Do self test */
280	ret = adis16204_self_test(indio_dev);
281	if (ret) {
282		dev_err(&indio_dev->dev, "self test failure");
283		goto err_ret;
284	}
285
286	/* Read status register to check the result */
287	ret = adis16204_check_status(indio_dev);
288	if (ret) {
289		adis16204_reset(indio_dev);
290		dev_err(&indio_dev->dev, "device not playing ball -> reset");
291		msleep(ADIS16204_STARTUP_DELAY);
292		ret = adis16204_check_status(indio_dev);
293		if (ret) {
294			dev_err(&indio_dev->dev, "giving up");
295			goto err_ret;
296		}
297	}
298
299err_ret:
300	return ret;
301}
302static IIO_DEV_ATTR_ACCEL_XY(adis16204_read_14bit_signed,
303		ADIS16204_XY_RSS_OUT);
304static IIO_DEV_ATTR_ACCEL_XPEAK(adis16204_read_14bit_signed,
305		ADIS16204_X_PEAK_OUT);
306static IIO_DEV_ATTR_ACCEL_YPEAK(adis16204_read_14bit_signed,
307		ADIS16204_Y_PEAK_OUT);
308static IIO_DEV_ATTR_ACCEL_XYPEAK(adis16204_read_14bit_signed,
309		ADIS16204_XY_PEAK_OUT);
310static IIO_CONST_ATTR(accel_xy_scale, "0.017125");
311
312static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16204_write_reset, 0);
313
314enum adis16204_channel {
315	in_supply,
316	in_aux,
317	temp,
318	accel_x,
319	accel_y,
320};
321
322static u8 adis16204_addresses[5][2] = {
323	[in_supply] = { ADIS16204_SUPPLY_OUT },
324	[in_aux] = { ADIS16204_AUX_ADC },
325	[temp] = { ADIS16204_TEMP_OUT },
326	[accel_x] = { ADIS16204_XACCL_OUT, ADIS16204_XACCL_NULL },
327	[accel_y] = { ADIS16204_XACCL_OUT, ADIS16204_YACCL_NULL },
328};
329static int adis16204_read_raw(struct iio_dev *indio_dev,
330			      struct iio_chan_spec const *chan,
331			      int *val, int *val2,
332			      long mask)
333{
334	int ret;
335	int bits;
336	u8 addr;
337	s16 val16;
338
339	switch (mask) {
340	case 0:
341		mutex_lock(&indio_dev->mlock);
342		addr = adis16204_addresses[chan->address][0];
343		ret = adis16204_spi_read_reg_16(indio_dev, addr, &val16);
344		if (ret)
345			return ret;
346
347		if (val16 & ADIS16204_ERROR_ACTIVE) {
348			ret = adis16204_check_status(indio_dev);
349			if (ret)
350				return ret;
351		}
352		val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
353		if (chan->scan_type.sign == 's')
354			val16 = (s16)(val16 <<
355				      (16 - chan->scan_type.realbits)) >>
356				(16 - chan->scan_type.realbits);
357		*val = val16;
358		mutex_unlock(&indio_dev->mlock);
359		return IIO_VAL_INT;
360	case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
361		switch (chan->type) {
362		case IIO_IN:
363			*val = 0;
364			if (chan->channel == 0)
365				*val2 = 1220;
366			else
367				*val2 = 610;
368			return IIO_VAL_INT_PLUS_MICRO;
369		case IIO_TEMP:
370			*val = 0;
371			*val2 = -470000;
372			return IIO_VAL_INT_PLUS_MICRO;
373		case IIO_ACCEL:
374			*val = 0;
375			if (chan->channel == 'x')
376				*val2 = 17125;
377			else
378				*val2 = 8407;
379			return IIO_VAL_INT_PLUS_MICRO;
380		default:
381			return -EINVAL;
382		}
383		break;
384	case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
385		*val = 25;
386		return IIO_VAL_INT;
387	case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
388		switch (chan->type) {
389		case IIO_ACCEL:
390			bits = 12;
391			break;
392		default:
393			return -EINVAL;
394		};
395		mutex_lock(&indio_dev->mlock);
396		addr = adis16204_addresses[chan->address][1];
397		ret = adis16204_spi_read_reg_16(indio_dev, addr, &val16);
398		if (ret) {
399			mutex_unlock(&indio_dev->mlock);
400			return ret;
401		}
402		val16 &= (1 << bits) - 1;
403		val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
404		*val = val16;
405		mutex_unlock(&indio_dev->mlock);
406		return IIO_VAL_INT;
407	}
408	return -EINVAL;
409}
410
411static int adis16204_write_raw(struct iio_dev *indio_dev,
412			       struct iio_chan_spec const *chan,
413			       int val,
414			       int val2,
415			       long mask)
416{
417	int bits;
418	s16 val16;
419	u8 addr;
420	switch (mask) {
421	case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
422		switch (chan->type) {
423		case IIO_ACCEL:
424			bits = 12;
425			break;
426		default:
427			return -EINVAL;
428		};
429		val16 = val & ((1 << bits) - 1);
430		addr = adis16204_addresses[chan->address][1];
431		return adis16204_spi_write_reg_16(indio_dev, addr, val16);
432	}
433	return -EINVAL;
434}
435
436static struct iio_chan_spec adis16204_channels[] = {
437	IIO_CHAN(IIO_IN, 0, 0, 0, "supply", 0, 0,
438		 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
439		 in_supply, ADIS16204_SCAN_SUPPLY,
440		 IIO_ST('u', 12, 16, 0), 0),
441	IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
442		 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
443		 in_aux, ADIS16204_SCAN_AUX_ADC,
444		 IIO_ST('u', 12, 16, 0), 0),
445	IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0,
446		 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
447		 (1 << IIO_CHAN_INFO_OFFSET_SEPARATE),
448		 temp, ADIS16204_SCAN_TEMP,
449		 IIO_ST('u', 12, 16, 0), 0),
450	IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X,
451		 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
452		 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
453		 accel_x, ADIS16204_SCAN_ACC_X,
454		 IIO_ST('s', 14, 16, 0), 0),
455	IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y,
456		 (1 << IIO_CHAN_INFO_SCALE_SEPARATE) |
457		 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
458		 accel_y, ADIS16204_SCAN_ACC_Y,
459		 IIO_ST('s', 14, 16, 0), 0),
460	IIO_CHAN_SOFT_TIMESTAMP(5),
461};
462static struct attribute *adis16204_attributes[] = {
463	&iio_dev_attr_reset.dev_attr.attr,
464	&iio_dev_attr_accel_xy.dev_attr.attr,
465	&iio_dev_attr_accel_xpeak.dev_attr.attr,
466	&iio_dev_attr_accel_ypeak.dev_attr.attr,
467	&iio_dev_attr_accel_xypeak.dev_attr.attr,
468	&iio_const_attr_accel_xy_scale.dev_attr.attr,
469	NULL
470};
471
472static const struct attribute_group adis16204_attribute_group = {
473	.attrs = adis16204_attributes,
474};
475
476static const struct iio_info adis16204_info = {
477	.attrs = &adis16204_attribute_group,
478	.read_raw = &adis16204_read_raw,
479	.write_raw = &adis16204_write_raw,
480	.driver_module = THIS_MODULE,
481};
482
483static int __devinit adis16204_probe(struct spi_device *spi)
484{
485	int ret, regdone = 0;
486	struct adis16204_state *st = kzalloc(sizeof *st, GFP_KERNEL);
487	if (!st) {
488		ret =  -ENOMEM;
489		goto error_ret;
490	}
491	/* this is only used for removal purposes */
492	spi_set_drvdata(spi, st);
493
494	/* Allocate the comms buffers */
495	st->rx = kzalloc(sizeof(*st->rx)*ADIS16204_MAX_RX, GFP_KERNEL);
496	if (st->rx == NULL) {
497		ret = -ENOMEM;
498		goto error_free_st;
499	}
500	st->tx = kzalloc(sizeof(*st->tx)*ADIS16204_MAX_TX, GFP_KERNEL);
501	if (st->tx == NULL) {
502		ret = -ENOMEM;
503		goto error_free_rx;
504	}
505	st->us = spi;
506	mutex_init(&st->buf_lock);
507	/* setup the industrialio driver allocated elements */
508	st->indio_dev = iio_allocate_device(0);
509	if (st->indio_dev == NULL) {
510		ret = -ENOMEM;
511		goto error_free_tx;
512	}
513
514	st->indio_dev->name = spi->dev.driver->name;
515	st->indio_dev->dev.parent = &spi->dev;
516	st->indio_dev->info = &adis16204_info;
517	st->indio_dev->channels = adis16204_channels;
518	st->indio_dev->num_channels = ARRAY_SIZE(adis16204_channels);
519	st->indio_dev->dev_data = (void *)(st);
520	st->indio_dev->modes = INDIO_DIRECT_MODE;
521
522	ret = adis16204_configure_ring(st->indio_dev);
523	if (ret)
524		goto error_free_dev;
525
526	ret = iio_device_register(st->indio_dev);
527	if (ret)
528		goto error_unreg_ring_funcs;
529	regdone = 1;
530
531	ret = iio_ring_buffer_register_ex(st->indio_dev->ring, 0,
532					  adis16204_channels,
533					  ARRAY_SIZE(adis16204_channels));
534	if (ret) {
535		printk(KERN_ERR "failed to initialize the ring\n");
536		goto error_unreg_ring_funcs;
537	}
538
539	if (spi->irq) {
540		ret = adis16204_probe_trigger(st->indio_dev);
541		if (ret)
542			goto error_uninitialize_ring;
543	}
544
545	/* Get the device into a sane initial state */
546	ret = adis16204_initial_setup(st->indio_dev);
547	if (ret)
548		goto error_remove_trigger;
549	return 0;
550
551error_remove_trigger:
552	adis16204_remove_trigger(st->indio_dev);
553error_uninitialize_ring:
554	iio_ring_buffer_unregister(st->indio_dev->ring);
555error_unreg_ring_funcs:
556	adis16204_unconfigure_ring(st->indio_dev);
557error_free_dev:
558	if (regdone)
559		iio_device_unregister(st->indio_dev);
560	else
561		iio_free_device(st->indio_dev);
562error_free_tx:
563	kfree(st->tx);
564error_free_rx:
565	kfree(st->rx);
566error_free_st:
567	kfree(st);
568error_ret:
569	return ret;
570}
571
572static int adis16204_remove(struct spi_device *spi)
573{
574	struct adis16204_state *st = spi_get_drvdata(spi);
575	struct iio_dev *indio_dev = st->indio_dev;
576
577	adis16204_remove_trigger(indio_dev);
578	iio_ring_buffer_unregister(st->indio_dev->ring);
579	iio_device_unregister(indio_dev);
580	adis16204_unconfigure_ring(indio_dev);
581	kfree(st->tx);
582	kfree(st->rx);
583	kfree(st);
584
585	return 0;
586}
587
588static struct spi_driver adis16204_driver = {
589	.driver = {
590		.name = "adis16204",
591		.owner = THIS_MODULE,
592	},
593	.probe = adis16204_probe,
594	.remove = __devexit_p(adis16204_remove),
595};
596
597static __init int adis16204_init(void)
598{
599	return spi_register_driver(&adis16204_driver);
600}
601module_init(adis16204_init);
602
603static __exit void adis16204_exit(void)
604{
605	spi_unregister_driver(&adis16204_driver);
606}
607module_exit(adis16204_exit);
608
609MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
610MODULE_DESCRIPTION("ADIS16204 High-g Digital Impact Sensor and Recorder");
611MODULE_LICENSE("GPL v2");