1 #include <linux/export.h>
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>
9 #include "../ring_sw.h"
10 #include "../trigger_consumer.h"
11 #include "adis16209.h"
14 * adis16209_read_ring_data() read data registers which will be placed into ring
15 * @dev: device associated with child of actual device (iio_dev or iio_trig)
16 * @rx: somewhere to pass back the value read
18 static int adis16209_read_ring_data(struct device *dev, u8 *rx)
20 struct spi_message msg;
21 struct iio_dev *indio_dev = dev_get_drvdata(dev);
22 struct adis16209_state *st = iio_priv(indio_dev);
23 struct spi_transfer xfers[ADIS16209_OUTPUTS + 1];
27 mutex_lock(&st->buf_lock);
29 spi_message_init(&msg);
31 memset(xfers, 0, sizeof(xfers));
32 for (i = 0; i <= ADIS16209_OUTPUTS; i++) {
33 xfers[i].bits_per_word = 8;
34 xfers[i].cs_change = 1;
36 xfers[i].delay_usecs = 30;
37 xfers[i].tx_buf = st->tx + 2 * i;
39 = ADIS16209_READ_REG(ADIS16209_SUPPLY_OUT + 2 * i);
40 st->tx[2 * i + 1] = 0;
42 xfers[i].rx_buf = rx + 2 * (i - 1);
43 spi_message_add_tail(&xfers[i], &msg);
46 ret = spi_sync(st->us, &msg);
48 dev_err(&st->us->dev, "problem when burst reading");
50 mutex_unlock(&st->buf_lock);
55 /* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device
56 * specific to be rolled into the core.
58 static irqreturn_t adis16209_trigger_handler(int irq, void *p)
60 struct iio_poll_func *pf = p;
61 struct iio_dev *indio_dev = pf->indio_dev;
62 struct adis16209_state *st = iio_priv(indio_dev);
63 struct iio_buffer *ring = indio_dev->buffer;
67 size_t datasize = ring->access->get_bytes_per_datum(ring);
69 data = kmalloc(datasize , GFP_KERNEL);
71 dev_err(&st->us->dev, "memory alloc failed in ring bh");
75 if (ring->scan_count &&
76 adis16209_read_ring_data(&indio_dev->dev, st->rx) >= 0)
77 for (; i < ring->scan_count; i++)
78 data[i] = be16_to_cpup((__be16 *)&(st->rx[i*2]));
80 /* Guaranteed to be aligned with 8 byte boundary */
81 if (ring->scan_timestamp)
82 *((s64 *)(data + ((i + 3)/4)*4)) = pf->timestamp;
84 ring->access->store_to(ring, (u8 *)data, pf->timestamp);
86 iio_trigger_notify_done(indio_dev->trig);
92 void adis16209_unconfigure_ring(struct iio_dev *indio_dev)
94 iio_dealloc_pollfunc(indio_dev->pollfunc);
95 iio_sw_rb_free(indio_dev->buffer);
98 static const struct iio_buffer_setup_ops adis16209_ring_setup_ops = {
99 .preenable = &iio_sw_buffer_preenable,
100 .postenable = &iio_triggered_buffer_postenable,
101 .predisable = &iio_triggered_buffer_predisable,
104 int adis16209_configure_ring(struct iio_dev *indio_dev)
107 struct iio_buffer *ring;
109 ring = iio_sw_rb_allocate(indio_dev);
114 indio_dev->buffer = ring;
115 /* Effectively select the ring buffer implementation */
116 ring->access = &ring_sw_access_funcs;
118 ring->scan_timestamp = true;
119 ring->setup_ops = &adis16209_ring_setup_ops;
120 ring->owner = THIS_MODULE;
122 indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time,
123 &adis16209_trigger_handler,
129 if (indio_dev->pollfunc == NULL) {
131 goto error_iio_sw_rb_free;
134 indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
137 error_iio_sw_rb_free:
138 iio_sw_rb_free(indio_dev->buffer);