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 "adis16240.h"
14 * adis16240_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 adis16240_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 adis16240_state *st = iio_priv(indio_dev);
23 struct spi_transfer xfers[ADIS16240_OUTPUTS + 1];
27 mutex_lock(&st->buf_lock);
29 spi_message_init(&msg);
31 memset(xfers, 0, sizeof(xfers));
32 for (i = 0; i <= ADIS16240_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 = ADIS16240_READ_REG(ADIS16240_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 static irqreturn_t adis16240_trigger_handler(int irq, void *p)
57 struct iio_poll_func *pf = p;
58 struct iio_dev *indio_dev = pf->indio_dev;
59 struct adis16240_state *st = iio_priv(indio_dev);
60 struct iio_buffer *ring = indio_dev->buffer;
64 size_t datasize = ring->access->get_bytes_per_datum(ring);
66 data = kmalloc(datasize, GFP_KERNEL);
68 dev_err(&st->us->dev, "memory alloc failed in ring bh");
72 if (ring->scan_count &&
73 adis16240_read_ring_data(&indio_dev->dev, st->rx) >= 0)
74 for (; i < ring->scan_count; i++)
75 data[i] = be16_to_cpup((__be16 *)&(st->rx[i*2]));
77 /* Guaranteed to be aligned with 8 byte boundary */
78 if (ring->scan_timestamp)
79 *((s64 *)(data + ((i + 3)/4)*4)) = pf->timestamp;
81 ring->access->store_to(ring, (u8 *)data, pf->timestamp);
83 iio_trigger_notify_done(indio_dev->trig);
89 void adis16240_unconfigure_ring(struct iio_dev *indio_dev)
91 iio_dealloc_pollfunc(indio_dev->pollfunc);
92 iio_sw_rb_free(indio_dev->buffer);
95 static const struct iio_buffer_setup_ops adis16240_ring_setup_ops = {
96 .preenable = &iio_sw_buffer_preenable,
97 .postenable = &iio_triggered_buffer_postenable,
98 .predisable = &iio_triggered_buffer_predisable,
101 int adis16240_configure_ring(struct iio_dev *indio_dev)
104 struct iio_buffer *ring;
106 ring = iio_sw_rb_allocate(indio_dev);
111 indio_dev->buffer = ring;
112 /* Effectively select the ring buffer implementation */
113 ring->access = &ring_sw_access_funcs;
115 ring->scan_timestamp = true;
116 ring->setup_ops = &adis16240_ring_setup_ops;
117 ring->owner = THIS_MODULE;
119 indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time,
120 &adis16240_trigger_handler,
126 if (indio_dev->pollfunc == NULL) {
128 goto error_iio_sw_rb_free;
131 indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
134 error_iio_sw_rb_free:
135 iio_sw_rb_free(indio_dev->buffer);