1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/interrupt.h>
3 #include <linux/mutex.h>
4 #include <linux/kernel.h>
5 #include <linux/spi/spi.h>
6 #include <linux/slab.h>
7 #include <linux/bitops.h>
8 #include <linux/export.h>
9
10 #include <linux/iio/iio.h>
11 #include <linux/iio/buffer.h>
12 #include <linux/iio/triggered_buffer.h>
13 #include <linux/iio/trigger_consumer.h>
14
15 #include "adis16400.h"
16
adis16400_update_scan_mode(struct iio_dev * indio_dev,const unsigned long * scan_mask)17 int adis16400_update_scan_mode(struct iio_dev *indio_dev,
18 const unsigned long *scan_mask)
19 {
20 struct adis16400_state *st = iio_priv(indio_dev);
21 struct adis *adis = &st->adis;
22 unsigned int burst_length;
23 u8 *tx;
24
25 if (st->variant->flags & ADIS16400_NO_BURST)
26 return adis_update_scan_mode(indio_dev, scan_mask);
27
28 kfree(adis->xfer);
29 kfree(adis->buffer);
30
31 /* All but the timestamp channel */
32 burst_length = (indio_dev->num_channels - 1) * sizeof(u16);
33 if (st->variant->flags & ADIS16400_BURST_DIAG_STAT)
34 burst_length += sizeof(u16);
35
36 adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL);
37 if (!adis->xfer)
38 return -ENOMEM;
39
40 adis->buffer = kzalloc(burst_length + sizeof(u16), GFP_KERNEL);
41 if (!adis->buffer)
42 return -ENOMEM;
43
44 tx = adis->buffer + burst_length;
45 tx[0] = ADIS_READ_REG(ADIS16400_GLOB_CMD);
46 tx[1] = 0;
47
48 adis->xfer[0].tx_buf = tx;
49 adis->xfer[0].bits_per_word = 8;
50 adis->xfer[0].len = 2;
51 adis->xfer[1].rx_buf = adis->buffer;
52 adis->xfer[1].bits_per_word = 8;
53 adis->xfer[1].len = burst_length;
54
55 spi_message_init(&adis->msg);
56 spi_message_add_tail(&adis->xfer[0], &adis->msg);
57 spi_message_add_tail(&adis->xfer[1], &adis->msg);
58
59 return 0;
60 }
61
adis16400_trigger_handler(int irq,void * p)62 irqreturn_t adis16400_trigger_handler(int irq, void *p)
63 {
64 struct iio_poll_func *pf = p;
65 struct iio_dev *indio_dev = pf->indio_dev;
66 struct adis16400_state *st = iio_priv(indio_dev);
67 struct adis *adis = &st->adis;
68 u32 old_speed_hz = st->adis.spi->max_speed_hz;
69 void *buffer;
70 int ret;
71
72 if (!adis->buffer)
73 return -ENOMEM;
74
75 if (!(st->variant->flags & ADIS16400_NO_BURST) &&
76 st->adis.spi->max_speed_hz > ADIS16400_SPI_BURST) {
77 st->adis.spi->max_speed_hz = ADIS16400_SPI_BURST;
78 spi_setup(st->adis.spi);
79 }
80
81 ret = spi_sync(adis->spi, &adis->msg);
82 if (ret)
83 dev_err(&adis->spi->dev, "Failed to read data: %d\n", ret);
84
85 if (!(st->variant->flags & ADIS16400_NO_BURST)) {
86 st->adis.spi->max_speed_hz = old_speed_hz;
87 spi_setup(st->adis.spi);
88 }
89
90 if (st->variant->flags & ADIS16400_BURST_DIAG_STAT)
91 buffer = adis->buffer + sizeof(u16);
92 else
93 buffer = adis->buffer;
94
95 iio_push_to_buffers_with_timestamp(indio_dev, buffer,
96 pf->timestamp);
97
98 iio_trigger_notify_done(indio_dev->trig);
99
100 return IRQ_HANDLED;
101 }
102