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/drivers/staging/iio/accel/adis16240_core.c

https://bitbucket.org/slukk/jb-tsm-kernel-4.2
C | 647 lines | 535 code | 77 blank | 35 comment | 45 complexity | e6d2f492c9ea429ce0f44d046c9e026b MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/*
  2 * ADIS16240 Programmable Impact Sensor and Recorder driver
  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 "adis16240.h"
 28
 29#define DRIVER_NAME		"adis16240"
 30
 31static int adis16240_check_status(struct iio_dev *indio_dev);
 32
 33/**
 34 * adis16240_spi_write_reg_8() - write single byte to a register
 35 * @indio_dev: iio_dev associated with device
 36 * @reg_address: the address of the register to be written
 37 * @val: the value to write
 38 **/
 39static int adis16240_spi_write_reg_8(struct iio_dev *indio_dev,
 40				     u8 reg_address,
 41				     u8 val)
 42{
 43	int ret;
 44	struct adis16240_state *st = iio_dev_get_devdata(indio_dev);
 45
 46	mutex_lock(&st->buf_lock);
 47	st->tx[0] = ADIS16240_WRITE_REG(reg_address);
 48	st->tx[1] = val;
 49
 50	ret = spi_write(st->us, st->tx, 2);
 51	mutex_unlock(&st->buf_lock);
 52
 53	return ret;
 54}
 55
 56/**
 57 * adis16240_spi_write_reg_16() - write 2 bytes to a pair of registers
 58 * @indio_dev: iio_dev for this device
 59 * @reg_address: the address of the lower of the two registers. Second register
 60 *               is assumed to have address one greater.
 61 * @val: value to be written
 62 **/
 63static int adis16240_spi_write_reg_16(struct iio_dev *indio_dev,
 64				      u8 lower_reg_address,
 65				      u16 value)
 66{
 67	int ret;
 68	struct spi_message msg;
 69	struct adis16240_state *st = iio_dev_get_devdata(indio_dev);
 70	struct spi_transfer xfers[] = {
 71		{
 72			.tx_buf = st->tx,
 73			.bits_per_word = 8,
 74			.len = 2,
 75			.cs_change = 1,
 76			.delay_usecs = 35,
 77		}, {
 78			.tx_buf = st->tx + 2,
 79			.bits_per_word = 8,
 80			.len = 2,
 81			.delay_usecs = 35,
 82		},
 83	};
 84
 85	mutex_lock(&st->buf_lock);
 86	st->tx[0] = ADIS16240_WRITE_REG(lower_reg_address);
 87	st->tx[1] = value & 0xFF;
 88	st->tx[2] = ADIS16240_WRITE_REG(lower_reg_address + 1);
 89	st->tx[3] = (value >> 8) & 0xFF;
 90
 91	spi_message_init(&msg);
 92	spi_message_add_tail(&xfers[0], &msg);
 93	spi_message_add_tail(&xfers[1], &msg);
 94	ret = spi_sync(st->us, &msg);
 95	mutex_unlock(&st->buf_lock);
 96
 97	return ret;
 98}
 99
100/**
101 * adis16240_spi_read_reg_16() - read 2 bytes from a 16-bit register
102 * @indio_dev: iio_dev for this device
103 * @reg_address: the address of the lower of the two registers. Second register
104 *               is assumed to have address one greater.
105 * @val: somewhere to pass back the value read
106 **/
107static int adis16240_spi_read_reg_16(struct iio_dev *indio_dev,
108		u8 lower_reg_address,
109		u16 *val)
110{
111	struct spi_message msg;
112	struct adis16240_state *st = iio_dev_get_devdata(indio_dev);
113	int ret;
114	struct spi_transfer xfers[] = {
115		{
116			.tx_buf = st->tx,
117			.bits_per_word = 8,
118			.len = 2,
119			.cs_change = 1,
120			.delay_usecs = 35,
121		}, {
122			.rx_buf = st->rx,
123			.bits_per_word = 8,
124			.len = 2,
125			.cs_change = 1,
126			.delay_usecs = 35,
127		},
128	};
129
130	mutex_lock(&st->buf_lock);
131	st->tx[0] = ADIS16240_READ_REG(lower_reg_address);
132	st->tx[1] = 0;
133	st->tx[2] = 0;
134	st->tx[3] = 0;
135
136	spi_message_init(&msg);
137	spi_message_add_tail(&xfers[0], &msg);
138	spi_message_add_tail(&xfers[1], &msg);
139	ret = spi_sync(st->us, &msg);
140	if (ret) {
141		dev_err(&st->us->dev,
142			"problem when reading 16 bit register 0x%02X",
143			lower_reg_address);
144		goto error_ret;
145	}
146	*val = (st->rx[0] << 8) | st->rx[1];
147
148error_ret:
149	mutex_unlock(&st->buf_lock);
150	return ret;
151}
152
153static ssize_t adis16240_spi_read_signed(struct device *dev,
154		struct device_attribute *attr,
155		char *buf,
156		unsigned bits)
157{
158	struct iio_dev *indio_dev = dev_get_drvdata(dev);
159	int ret;
160	s16 val = 0;
161	unsigned shift = 16 - bits;
162	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
163
164	ret = adis16240_spi_read_reg_16(indio_dev,
165					this_attr->address, (u16 *)&val);
166	if (ret)
167		return ret;
168
169	if (val & ADIS16240_ERROR_ACTIVE)
170		adis16240_check_status(indio_dev);
171
172	val = ((s16)(val << shift) >> shift);
173	return sprintf(buf, "%d\n", val);
174}
175
176static ssize_t adis16240_read_12bit_signed(struct device *dev,
177		struct device_attribute *attr,
178		char *buf)
179{
180	ssize_t ret;
181	struct iio_dev *indio_dev = dev_get_drvdata(dev);
182
183	/* Take the iio_dev status lock */
184	mutex_lock(&indio_dev->mlock);
185	ret =  adis16240_spi_read_signed(dev, attr, buf, 12);
186	mutex_unlock(&indio_dev->mlock);
187
188	return ret;
189}
190
191static int adis16240_reset(struct iio_dev *indio_dev)
192{
193	int ret;
194	ret = adis16240_spi_write_reg_8(indio_dev,
195			ADIS16240_GLOB_CMD,
196			ADIS16240_GLOB_CMD_SW_RESET);
197	if (ret)
198		dev_err(&indio_dev->dev, "problem resetting device");
199
200	return ret;
201}
202
203static ssize_t adis16240_write_reset(struct device *dev,
204		struct device_attribute *attr,
205		const char *buf, size_t len)
206{
207	struct iio_dev *indio_dev = dev_get_drvdata(dev);
208
209	if (len < 1)
210		return -EINVAL;
211	switch (buf[0]) {
212	case '1':
213	case 'y':
214	case 'Y':
215		return adis16240_reset(indio_dev);
216	}
217	return -EINVAL;
218}
219
220int adis16240_set_irq(struct iio_dev *indio_dev, bool enable)
221{
222	int ret = 0;
223	u16 msc;
224
225	ret = adis16240_spi_read_reg_16(indio_dev,
226					ADIS16240_MSC_CTRL, &msc);
227	if (ret)
228		goto error_ret;
229
230	msc |= ADIS16240_MSC_CTRL_ACTIVE_HIGH;
231	msc &= ~ADIS16240_MSC_CTRL_DATA_RDY_DIO2;
232	if (enable)
233		msc |= ADIS16240_MSC_CTRL_DATA_RDY_EN;
234	else
235		msc &= ~ADIS16240_MSC_CTRL_DATA_RDY_EN;
236
237	ret = adis16240_spi_write_reg_16(indio_dev,
238					 ADIS16240_MSC_CTRL, msc);
239
240error_ret:
241	return ret;
242}
243
244static int adis16240_self_test(struct iio_dev *indio_dev)
245{
246	int ret;
247	ret = adis16240_spi_write_reg_16(indio_dev,
248			ADIS16240_MSC_CTRL,
249			ADIS16240_MSC_CTRL_SELF_TEST_EN);
250	if (ret) {
251		dev_err(&indio_dev->dev, "problem starting self test");
252		goto err_ret;
253	}
254
255	msleep(ADIS16240_STARTUP_DELAY);
256
257	adis16240_check_status(indio_dev);
258
259err_ret:
260	return ret;
261}
262
263static int adis16240_check_status(struct iio_dev *indio_dev)
264{
265	u16 status;
266	int ret;
267	struct device *dev = &indio_dev->dev;
268
269	ret = adis16240_spi_read_reg_16(indio_dev,
270					ADIS16240_DIAG_STAT, &status);
271
272	if (ret < 0) {
273		dev_err(dev, "Reading status failed\n");
274		goto error_ret;
275	}
276
277	ret = status & 0x2F;
278	if (status & ADIS16240_DIAG_STAT_PWRON_FAIL)
279		dev_err(dev, "Power-on, self-test fail\n");
280	if (status & ADIS16240_DIAG_STAT_SPI_FAIL)
281		dev_err(dev, "SPI failure\n");
282	if (status & ADIS16240_DIAG_STAT_FLASH_UPT)
283		dev_err(dev, "Flash update failed\n");
284	if (status & ADIS16240_DIAG_STAT_POWER_HIGH)
285		dev_err(dev, "Power supply above 3.625V\n");
286	if (status & ADIS16240_DIAG_STAT_POWER_LOW)
287		dev_err(dev, "Power supply below 2.225V\n");
288
289error_ret:
290	return ret;
291}
292
293static int adis16240_initial_setup(struct iio_dev *indio_dev)
294{
295	int ret;
296	struct device *dev = &indio_dev->dev;
297
298	/* Disable IRQ */
299	ret = adis16240_set_irq(indio_dev, false);
300	if (ret) {
301		dev_err(dev, "disable irq failed");
302		goto err_ret;
303	}
304
305	/* Do self test */
306	ret = adis16240_self_test(indio_dev);
307	if (ret) {
308		dev_err(dev, "self test failure");
309		goto err_ret;
310	}
311
312	/* Read status register to check the result */
313	ret = adis16240_check_status(indio_dev);
314	if (ret) {
315		adis16240_reset(indio_dev);
316		dev_err(dev, "device not playing ball -> reset");
317		msleep(ADIS16240_STARTUP_DELAY);
318		ret = adis16240_check_status(indio_dev);
319		if (ret) {
320			dev_err(dev, "giving up");
321			goto err_ret;
322		}
323	}
324
325err_ret:
326	return ret;
327}
328
329static IIO_DEVICE_ATTR(accel_xyz_squared_peak_raw, S_IRUGO,
330		       adis16240_read_12bit_signed, NULL,
331		       ADIS16240_XYZPEAK_OUT);
332
333static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16240_write_reset, 0);
334
335static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("4096");
336
337enum adis16240_chan {
338	in_supply,
339	in_aux,
340	accel_x,
341	accel_y,
342	accel_z,
343	temp,
344};
345
346static const u8 adis16240_addresses[6][3] = {
347	[in_supply] = { ADIS16240_SUPPLY_OUT },
348	[in_aux] = { ADIS16240_AUX_ADC },
349	[accel_x] = { ADIS16240_XACCL_OUT, ADIS16240_XACCL_OFF,
350		      ADIS16240_XPEAK_OUT },
351	[accel_y] = { ADIS16240_YACCL_OUT, ADIS16240_YACCL_OFF,
352		      ADIS16240_YPEAK_OUT },
353	[accel_z] = { ADIS16240_ZACCL_OUT, ADIS16240_ZACCL_OFF,
354		      ADIS16240_ZPEAK_OUT },
355	[temp] = { ADIS16240_TEMP_OUT },
356};
357
358static int adis16240_read_raw(struct iio_dev *indio_dev,
359			      struct iio_chan_spec const *chan,
360			      int *val, int *val2,
361			      long mask)
362{
363	int ret;
364	int bits;
365	u8 addr;
366	s16 val16;
367
368	switch (mask) {
369	case 0:
370		mutex_lock(&indio_dev->mlock);
371		addr = adis16240_addresses[chan->address][0];
372		ret = adis16240_spi_read_reg_16(indio_dev, addr, &val16);
373		if (ret)
374			return ret;
375
376		if (val16 & ADIS16240_ERROR_ACTIVE) {
377			ret = adis16240_check_status(indio_dev);
378			if (ret)
379				return ret;
380		}
381		val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
382		if (chan->scan_type.sign == 's')
383			val16 = (s16)(val16 <<
384				      (16 - chan->scan_type.realbits)) >>
385				(16 - chan->scan_type.realbits);
386		*val = val16;
387		mutex_unlock(&indio_dev->mlock);
388		return IIO_VAL_INT;
389	case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
390	case (1 << IIO_CHAN_INFO_SCALE_SHARED):
391		switch (chan->type) {
392		case IIO_IN:
393			*val = 0;
394			if (chan->channel == 0)
395				*val2 = 4880;
396			else
397				return -EINVAL;
398			return IIO_VAL_INT_PLUS_MICRO;
399		case IIO_TEMP:
400			*val = 0;
401			*val2 = 244000;
402			return IIO_VAL_INT_PLUS_MICRO;
403		case IIO_ACCEL:
404			*val = 0;
405			*val2 = 504062;
406			return IIO_VAL_INT_PLUS_MICRO;
407		default:
408			return -EINVAL;
409		}
410		break;
411	case (1 << IIO_CHAN_INFO_PEAK_SCALE_SHARED):
412		*val = 6;
413		*val2 = 629295;
414		return IIO_VAL_INT_PLUS_MICRO;
415	case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
416		*val = 25;
417		return IIO_VAL_INT;
418	case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
419		bits = 10;
420		mutex_lock(&indio_dev->mlock);
421		addr = adis16240_addresses[chan->address][1];
422		ret = adis16240_spi_read_reg_16(indio_dev, addr, &val16);
423		if (ret) {
424			mutex_unlock(&indio_dev->mlock);
425			return ret;
426		}
427		val16 &= (1 << bits) - 1;
428		val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
429		*val = val16;
430		mutex_unlock(&indio_dev->mlock);
431		return IIO_VAL_INT;
432	case (1 << IIO_CHAN_INFO_PEAK_SEPARATE):
433		bits = 10;
434		mutex_lock(&indio_dev->mlock);
435		addr = adis16240_addresses[chan->address][2];
436		ret = adis16240_spi_read_reg_16(indio_dev, addr, &val16);
437		if (ret) {
438			mutex_unlock(&indio_dev->mlock);
439			return ret;
440		}
441		val16 &= (1 << bits) - 1;
442		val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
443		*val = val16;
444		mutex_unlock(&indio_dev->mlock);
445		return IIO_VAL_INT;
446	}
447	return -EINVAL;
448}
449
450static int adis16240_write_raw(struct iio_dev *indio_dev,
451			       struct iio_chan_spec const *chan,
452			       int val,
453			       int val2,
454			       long mask)
455{
456	int bits = 10;
457	s16 val16;
458	u8 addr;
459	switch (mask) {
460	case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE):
461		val16 = val & ((1 << bits) - 1);
462		addr = adis16240_addresses[chan->address][1];
463		return adis16240_spi_write_reg_16(indio_dev, addr, val16);
464	}
465	return -EINVAL;
466}
467
468static struct iio_chan_spec adis16240_channels[] = {
469	IIO_CHAN(IIO_IN, 0, 1, 0, "supply", 0, 0,
470		 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
471		 in_supply, ADIS16240_SCAN_SUPPLY,
472		 IIO_ST('u', 10, 16, 0), 0),
473	IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
474		 0,
475		 in_aux, ADIS16240_SCAN_AUX_ADC,
476		 IIO_ST('u', 10, 16, 0), 0),
477	IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X,
478		 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
479		 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
480		 accel_x, ADIS16240_SCAN_ACC_X,
481		 IIO_ST('s', 10, 16, 0), 0),
482	IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y,
483		 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
484		 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
485		 accel_y, ADIS16240_SCAN_ACC_Y,
486		 IIO_ST('s', 10, 16, 0), 0),
487	IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Z,
488		 (1 << IIO_CHAN_INFO_SCALE_SHARED) |
489		 (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE),
490		 accel_z, ADIS16240_SCAN_ACC_Z,
491		 IIO_ST('s', 10, 16, 0), 0),
492	IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0,
493		 (1 << IIO_CHAN_INFO_SCALE_SEPARATE),
494		 temp, ADIS16240_SCAN_TEMP,
495		 IIO_ST('u', 10, 16, 0), 0),
496	IIO_CHAN_SOFT_TIMESTAMP(6)
497};
498
499static struct attribute *adis16240_attributes[] = {
500	&iio_dev_attr_accel_xyz_squared_peak_raw.dev_attr.attr,
501	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
502	&iio_dev_attr_reset.dev_attr.attr,
503	NULL
504};
505
506static const struct attribute_group adis16240_attribute_group = {
507	.attrs = adis16240_attributes,
508};
509
510static const struct iio_info adis16240_info = {
511	.attrs = &adis16240_attribute_group,
512	.read_raw = &adis16240_read_raw,
513	.write_raw = &adis16240_write_raw,
514	.driver_module = THIS_MODULE,
515};
516
517static int __devinit adis16240_probe(struct spi_device *spi)
518{
519	int ret, regdone = 0;
520	struct adis16240_state *st = kzalloc(sizeof *st, GFP_KERNEL);
521	if (!st) {
522		ret =  -ENOMEM;
523		goto error_ret;
524	}
525	/* this is only used for removal purposes */
526	spi_set_drvdata(spi, st);
527
528	/* Allocate the comms buffers */
529	st->rx = kzalloc(sizeof(*st->rx)*ADIS16240_MAX_RX, GFP_KERNEL);
530	if (st->rx == NULL) {
531		ret = -ENOMEM;
532		goto error_free_st;
533	}
534	st->tx = kzalloc(sizeof(*st->tx)*ADIS16240_MAX_TX, GFP_KERNEL);
535	if (st->tx == NULL) {
536		ret = -ENOMEM;
537		goto error_free_rx;
538	}
539	st->us = spi;
540	mutex_init(&st->buf_lock);
541	/* setup the industrialio driver allocated elements */
542	st->indio_dev = iio_allocate_device(0);
543	if (st->indio_dev == NULL) {
544		ret = -ENOMEM;
545		goto error_free_tx;
546	}
547
548	st->indio_dev->name = spi->dev.driver->name;
549	st->indio_dev->dev.parent = &spi->dev;
550	st->indio_dev->info = &adis16240_info;
551	st->indio_dev->channels = adis16240_channels;
552	st->indio_dev->num_channels = ARRAY_SIZE(adis16240_channels);
553	st->indio_dev->dev_data = (void *)(st);
554	st->indio_dev->modes = INDIO_DIRECT_MODE;
555
556	ret = adis16240_configure_ring(st->indio_dev);
557	if (ret)
558		goto error_free_dev;
559
560	ret = iio_device_register(st->indio_dev);
561	if (ret)
562		goto error_unreg_ring_funcs;
563	regdone = 1;
564
565	ret = iio_ring_buffer_register_ex(st->indio_dev->ring, 0,
566					  adis16240_channels,
567					  ARRAY_SIZE(adis16240_channels));
568	if (ret) {
569		printk(KERN_ERR "failed to initialize the ring\n");
570		goto error_unreg_ring_funcs;
571	}
572
573	if (spi->irq) {
574		ret = adis16240_probe_trigger(st->indio_dev);
575		if (ret)
576			goto error_uninitialize_ring;
577	}
578
579	/* Get the device into a sane initial state */
580	ret = adis16240_initial_setup(st->indio_dev);
581	if (ret)
582		goto error_remove_trigger;
583	return 0;
584
585error_remove_trigger:
586	adis16240_remove_trigger(st->indio_dev);
587error_uninitialize_ring:
588	iio_ring_buffer_unregister(st->indio_dev->ring);
589error_unreg_ring_funcs:
590	adis16240_unconfigure_ring(st->indio_dev);
591error_free_dev:
592	if (regdone)
593		iio_device_unregister(st->indio_dev);
594	else
595		iio_free_device(st->indio_dev);
596error_free_tx:
597	kfree(st->tx);
598error_free_rx:
599	kfree(st->rx);
600error_free_st:
601	kfree(st);
602error_ret:
603	return ret;
604}
605
606static int adis16240_remove(struct spi_device *spi)
607{
608	struct adis16240_state *st = spi_get_drvdata(spi);
609	struct iio_dev *indio_dev = st->indio_dev;
610
611	flush_scheduled_work();
612
613	adis16240_remove_trigger(indio_dev);
614	iio_ring_buffer_unregister(indio_dev->ring);
615	iio_device_unregister(indio_dev);
616	adis16240_unconfigure_ring(indio_dev);
617	kfree(st->tx);
618	kfree(st->rx);
619	kfree(st);
620
621	return 0;
622}
623
624static struct spi_driver adis16240_driver = {
625	.driver = {
626		.name = "adis16240",
627		.owner = THIS_MODULE,
628	},
629	.probe = adis16240_probe,
630	.remove = __devexit_p(adis16240_remove),
631};
632
633static __init int adis16240_init(void)
634{
635	return spi_register_driver(&adis16240_driver);
636}
637module_init(adis16240_init);
638
639static __exit void adis16240_exit(void)
640{
641	spi_unregister_driver(&adis16240_driver);
642}
643module_exit(adis16240_exit);
644
645MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
646MODULE_DESCRIPTION("Analog Devices Programmable Impact Sensor and Recorder");
647MODULE_LICENSE("GPL v2");