1#include <linux/interrupt.h>
2#include <linux/mutex.h>
3#include <linux/kernel.h>
4#include <linux/spi/spi.h>
5#include <linux/slab.h>
6#include <linux/bitops.h>
7#include <linux/export.h>
8
9#include <linux/iio/iio.h>
10#include <linux/iio/buffer.h>
11#include <linux/iio/triggered_buffer.h>
12#include <linux/iio/trigger_consumer.h>
13
14#include "adis16400.h"
15
16int adis16400_update_scan_mode(struct iio_dev *indio_dev,
17	const unsigned long *scan_mask)
18{
19	struct adis16400_state *st = iio_priv(indio_dev);
20	struct adis *adis = &st->adis;
21	uint16_t *tx;
22
23	if (st->variant->flags & ADIS16400_NO_BURST)
24		return adis_update_scan_mode(indio_dev, scan_mask);
25
26	kfree(adis->xfer);
27	kfree(adis->buffer);
28
29	adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL);
30	if (!adis->xfer)
31		return -ENOMEM;
32
33	adis->buffer = kzalloc(indio_dev->scan_bytes + sizeof(u16),
34		GFP_KERNEL);
35	if (!adis->buffer)
36		return -ENOMEM;
37
38	tx = adis->buffer + indio_dev->scan_bytes;
39
40	tx[0] = ADIS_READ_REG(ADIS16400_GLOB_CMD);
41	tx[1] = 0;
42
43	adis->xfer[0].tx_buf = tx;
44	adis->xfer[0].bits_per_word = 8;
45	adis->xfer[0].len = 2;
46	adis->xfer[1].tx_buf = tx;
47	adis->xfer[1].bits_per_word = 8;
48	adis->xfer[1].len = indio_dev->scan_bytes;
49
50	spi_message_init(&adis->msg);
51	spi_message_add_tail(&adis->xfer[0], &adis->msg);
52	spi_message_add_tail(&adis->xfer[1], &adis->msg);
53
54	return 0;
55}
56
57irqreturn_t adis16400_trigger_handler(int irq, void *p)
58{
59	struct iio_poll_func *pf = p;
60	struct iio_dev *indio_dev = pf->indio_dev;
61	struct adis16400_state *st = iio_priv(indio_dev);
62	struct adis *adis = &st->adis;
63	u32 old_speed_hz = st->adis.spi->max_speed_hz;
64	int ret;
65
66	if (!adis->buffer)
67		return -ENOMEM;
68
69	if (!(st->variant->flags & ADIS16400_NO_BURST) &&
70		st->adis.spi->max_speed_hz > ADIS16400_SPI_BURST) {
71		st->adis.spi->max_speed_hz = ADIS16400_SPI_BURST;
72		spi_setup(st->adis.spi);
73	}
74
75	ret = spi_sync(adis->spi, &adis->msg);
76	if (ret)
77		dev_err(&adis->spi->dev, "Failed to read data: %d\n", ret);
78
79	if (!(st->variant->flags & ADIS16400_NO_BURST)) {
80		st->adis.spi->max_speed_hz = old_speed_hz;
81		spi_setup(st->adis.spi);
82	}
83
84	iio_push_to_buffers_with_timestamp(indio_dev, adis->buffer,
85		pf->timestamp);
86
87	iio_trigger_notify_done(indio_dev->trig);
88
89	return IRQ_HANDLED;
90}
91