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>
8 #include "../ring_sw.h"
9 #include "../trigger.h"
10 #include "adis16260.h"
13 * adis16260_read_ring_data() read data registers which will be placed into ring
14 * @dev: device associated with child of actual device (iio_dev or iio_trig)
15 * @rx: somewhere to pass back the value read
17 static int adis16260_read_ring_data(struct device *dev, u8 *rx)
19 struct spi_message msg;
20 struct iio_dev *indio_dev = dev_get_drvdata(dev);
21 struct adis16260_state *st = iio_priv(indio_dev);
22 struct spi_transfer xfers[ADIS16260_OUTPUTS + 1];
26 mutex_lock(&st->buf_lock);
28 spi_message_init(&msg);
30 memset(xfers, 0, sizeof(xfers));
31 for (i = 0; i <= ADIS16260_OUTPUTS; i++) {
32 xfers[i].bits_per_word = 8;
33 xfers[i].cs_change = 1;
35 xfers[i].delay_usecs = 30;
36 xfers[i].tx_buf = st->tx + 2 * i;
37 if (i < 2) /* SUPPLY_OUT:0x02 GYRO_OUT:0x04 */
39 = ADIS16260_READ_REG(ADIS16260_SUPPLY_OUT
41 else /* 0x06 to 0x09 is reserved */
43 = ADIS16260_READ_REG(ADIS16260_SUPPLY_OUT
45 st->tx[2 * i + 1] = 0;
47 xfers[i].rx_buf = rx + 2 * (i - 1);
48 spi_message_add_tail(&xfers[i], &msg);
51 ret = spi_sync(st->us, &msg);
53 dev_err(&st->us->dev, "problem when burst reading");
55 mutex_unlock(&st->buf_lock);
60 static irqreturn_t adis16260_trigger_handler(int irq, void *p)
62 struct iio_poll_func *pf = p;
63 struct iio_dev *indio_dev = pf->private_data;
64 struct adis16260_state *st = iio_priv(indio_dev);
65 struct iio_ring_buffer *ring = indio_dev->ring;
68 size_t datasize = ring->access->get_bytes_per_datum(ring);
70 data = kmalloc(datasize , GFP_KERNEL);
72 dev_err(&st->us->dev, "memory alloc failed in ring bh");
76 if (ring->scan_count &&
77 adis16260_read_ring_data(&indio_dev->dev, st->rx) >= 0)
78 for (; i < ring->scan_count; i++)
79 data[i] = be16_to_cpup((__be16 *)&(st->rx[i*2]));
81 /* Guaranteed to be aligned with 8 byte boundary */
82 if (ring->scan_timestamp)
83 *((s64 *)(data + ((i + 3)/4)*4)) = pf->timestamp;
85 ring->access->store_to(ring, (u8 *)data, pf->timestamp);
87 iio_trigger_notify_done(indio_dev->trig);
93 void adis16260_unconfigure_ring(struct iio_dev *indio_dev)
95 iio_dealloc_pollfunc(indio_dev->pollfunc);
96 iio_sw_rb_free(indio_dev->ring);
99 static const struct iio_ring_setup_ops adis16260_ring_setup_ops = {
100 .preenable = &iio_sw_ring_preenable,
101 .postenable = &iio_triggered_ring_postenable,
102 .predisable = &iio_triggered_ring_predisable,
105 int adis16260_configure_ring(struct iio_dev *indio_dev)
108 struct iio_ring_buffer *ring;
110 ring = iio_sw_rb_allocate(indio_dev);
115 indio_dev->ring = ring;
116 /* Effectively select the ring buffer implementation */
117 ring->access = &ring_sw_access_funcs;
119 ring->scan_timestamp = true;
120 ring->setup_ops = &adis16260_ring_setup_ops;
121 ring->owner = THIS_MODULE;
123 /* Set default scan mode */
124 iio_scan_mask_set(ring, ADIS16260_SCAN_SUPPLY);
125 iio_scan_mask_set(ring, ADIS16260_SCAN_GYRO);
126 iio_scan_mask_set(ring, ADIS16260_SCAN_AUX_ADC);
127 iio_scan_mask_set(ring, ADIS16260_SCAN_TEMP);
128 iio_scan_mask_set(ring, ADIS16260_SCAN_ANGL);
130 indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time,
131 &adis16260_trigger_handler,
134 "adis16260_consumer%d",
136 if (indio_dev->pollfunc == NULL) {
138 goto error_iio_sw_rb_free;
141 indio_dev->modes |= INDIO_RING_TRIGGERED;
144 error_iio_sw_rb_free:
145 iio_sw_rb_free(indio_dev->ring);