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
adis16400_update_scan_mode(struct iio_dev * indio_dev,const unsigned long * scan_mask)16 int 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
adis16400_trigger_handler(int irq,void * p)57 irqreturn_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