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	unsigned int burst_length;
22	u8 *tx;
23
24	if (st->variant->flags & ADIS16400_NO_BURST)
25		return adis_update_scan_mode(indio_dev, scan_mask);
26
27	kfree(adis->xfer);
28	kfree(adis->buffer);
29
30	/* All but the timestamp channel */
31	burst_length = (indio_dev->num_channels - 1) * sizeof(u16);
32	if (st->variant->flags & ADIS16400_BURST_DIAG_STAT)
33		burst_length += sizeof(u16);
34
35	adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL);
36	if (!adis->xfer)
37		return -ENOMEM;
38
39	adis->buffer = kzalloc(burst_length + sizeof(u16), GFP_KERNEL);
40	if (!adis->buffer)
41		return -ENOMEM;
42
43	tx = adis->buffer + burst_length;
44	tx[0] = ADIS_READ_REG(ADIS16400_GLOB_CMD);
45	tx[1] = 0;
46
47	adis->xfer[0].tx_buf = tx;
48	adis->xfer[0].bits_per_word = 8;
49	adis->xfer[0].len = 2;
50	adis->xfer[1].rx_buf = adis->buffer;
51	adis->xfer[1].bits_per_word = 8;
52	adis->xfer[1].len = burst_length;
53
54	spi_message_init(&adis->msg);
55	spi_message_add_tail(&adis->xfer[0], &adis->msg);
56	spi_message_add_tail(&adis->xfer[1], &adis->msg);
57
58	return 0;
59}
60
61irqreturn_t adis16400_trigger_handler(int irq, void *p)
62{
63	struct iio_poll_func *pf = p;
64	struct iio_dev *indio_dev = pf->indio_dev;
65	struct adis16400_state *st = iio_priv(indio_dev);
66	struct adis *adis = &st->adis;
67	u32 old_speed_hz = st->adis.spi->max_speed_hz;
68	void *buffer;
69	int ret;
70
71	if (!adis->buffer)
72		return -ENOMEM;
73
74	if (!(st->variant->flags & ADIS16400_NO_BURST) &&
75		st->adis.spi->max_speed_hz > ADIS16400_SPI_BURST) {
76		st->adis.spi->max_speed_hz = ADIS16400_SPI_BURST;
77		spi_setup(st->adis.spi);
78	}
79
80	ret = spi_sync(adis->spi, &adis->msg);
81	if (ret)
82		dev_err(&adis->spi->dev, "Failed to read data: %d\n", ret);
83
84	if (!(st->variant->flags & ADIS16400_NO_BURST)) {
85		st->adis.spi->max_speed_hz = old_speed_hz;
86		spi_setup(st->adis.spi);
87	}
88
89	if (st->variant->flags & ADIS16400_BURST_DIAG_STAT)
90		buffer = adis->buffer + sizeof(u16);
91	else
92		buffer = adis->buffer;
93
94	iio_push_to_buffers_with_timestamp(indio_dev, buffer,
95		pf->timestamp);
96
97	iio_trigger_notify_done(indio_dev->trig);
98
99	return IRQ_HANDLED;
100}
101