Gitiles
Code Review Sign In
gerrit.nordix.org / codeaurora / cp-linux / 8d8f6542b666daf5e87de156590e635c2c4da0c0 / . / drivers / iio / imu / adis16400_buffer.c
blob: 90c24a23c679b8001e31cdff48b098cacb872682 [file] [log] [blame]
Kyle Swenson8d8f6542021-03-15 11:02:55 -0600[diff] [blame^]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}