1 #include <linux/interrupt.h>
3 #include <linux/gpio.h>
4 #include <linux/workqueue.h>
5 #include <linux/mutex.h>
6 #include <linux/device.h>
7 #include <linux/kernel.h>
8 #include <linux/spi/spi.h>
9 #include <linux/slab.h>
10 #include <linux/sysfs.h>
11 #include <linux/list.h>
15 #include "../ring_sw.h"
17 #include "../trigger.h"
18 #include "adis16240.h"
21 * adis16240_read_ring_data() read data registers which will be placed into ring
22 * @dev: device associated with child of actual device (iio_dev or iio_trig)
23 * @rx: somewhere to pass back the value read
25 static int adis16240_read_ring_data(struct device *dev, u8 *rx)
27 struct spi_message msg;
28 struct iio_dev *indio_dev = dev_get_drvdata(dev);
29 struct adis16240_state *st = iio_priv(indio_dev);
30 struct spi_transfer xfers[ADIS16240_OUTPUTS + 1];
34 mutex_lock(&st->buf_lock);
36 spi_message_init(&msg);
38 memset(xfers, 0, sizeof(xfers));
39 for (i = 0; i <= ADIS16240_OUTPUTS; i++) {
40 xfers[i].bits_per_word = 8;
41 xfers[i].cs_change = 1;
43 xfers[i].delay_usecs = 30;
44 xfers[i].tx_buf = st->tx + 2 * i;
46 = ADIS16240_READ_REG(ADIS16240_SUPPLY_OUT + 2 * i);
47 st->tx[2 * i + 1] = 0;
49 xfers[i].rx_buf = rx + 2 * (i - 1);
50 spi_message_add_tail(&xfers[i], &msg);
53 ret = spi_sync(st->us, &msg);
55 dev_err(&st->us->dev, "problem when burst reading");
57 mutex_unlock(&st->buf_lock);
62 static irqreturn_t adis16240_trigger_handler(int irq, void *p)
64 struct iio_poll_func *pf = p;
65 struct iio_dev *indio_dev = pf->private_data;
66 struct adis16240_state *st = iio_priv(indio_dev);
67 struct iio_ring_buffer *ring = indio_dev->ring;
71 size_t datasize = ring->access->get_bytes_per_datum(ring);
73 data = kmalloc(datasize, GFP_KERNEL);
75 dev_err(&st->us->dev, "memory alloc failed in ring bh");
79 if (ring->scan_count &&
80 adis16240_read_ring_data(&indio_dev->dev, st->rx) >= 0)
81 for (; i < ring->scan_count; i++)
82 data[i] = be16_to_cpup((__be16 *)&(st->rx[i*2]));
84 /* Guaranteed to be aligned with 8 byte boundary */
85 if (ring->scan_timestamp)
86 *((s64 *)(data + ((i + 3)/4)*4)) = pf->timestamp;
88 ring->access->store_to(ring, (u8 *)data, pf->timestamp);
90 iio_trigger_notify_done(indio_dev->trig);
96 void adis16240_unconfigure_ring(struct iio_dev *indio_dev)
98 iio_dealloc_pollfunc(indio_dev->pollfunc);
99 iio_sw_rb_free(indio_dev->ring);
102 static const struct iio_ring_setup_ops adis16240_ring_setup_ops = {
103 .preenable = &iio_sw_ring_preenable,
104 .postenable = &iio_triggered_ring_postenable,
105 .predisable = &iio_triggered_ring_predisable,
108 int adis16240_configure_ring(struct iio_dev *indio_dev)
111 struct iio_ring_buffer *ring;
113 ring = iio_sw_rb_allocate(indio_dev);
118 indio_dev->ring = ring;
119 /* Effectively select the ring buffer implementation */
120 ring->access = &ring_sw_access_funcs;
122 ring->scan_timestamp = true;
123 ring->setup_ops = &adis16240_ring_setup_ops;
124 ring->owner = THIS_MODULE;
126 /* Set default scan mode */
127 iio_scan_mask_set(ring, ADIS16240_SCAN_SUPPLY);
128 iio_scan_mask_set(ring, ADIS16240_SCAN_ACC_X);
129 iio_scan_mask_set(ring, ADIS16240_SCAN_ACC_Y);
130 iio_scan_mask_set(ring, ADIS16240_SCAN_ACC_Z);
131 iio_scan_mask_set(ring, ADIS16240_SCAN_AUX_ADC);
132 iio_scan_mask_set(ring, ADIS16240_SCAN_TEMP);
134 indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time,
135 &adis16240_trigger_handler,
141 if (indio_dev->pollfunc == NULL) {
143 goto error_iio_sw_rb_free;
146 indio_dev->modes |= INDIO_RING_TRIGGERED;
149 error_iio_sw_rb_free:
150 iio_sw_rb_free(indio_dev->ring);