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 "adis16209.h"
21 * adis16209_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 adis16209_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 adis16209_state *st = iio_priv(indio_dev);
30 struct spi_transfer xfers[ADIS16209_OUTPUTS + 1];
34 mutex_lock(&st->buf_lock);
36 spi_message_init(&msg);
38 memset(xfers, 0, sizeof(xfers));
39 for (i = 0; i <= ADIS16209_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 = ADIS16209_READ_REG(ADIS16209_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 /* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device
63 * specific to be rolled into the core.
65 static irqreturn_t adis16209_trigger_handler(int irq, void *p)
67 struct iio_poll_func *pf = p;
68 struct iio_dev *indio_dev = pf->private_data;
69 struct adis16209_state *st = iio_priv(indio_dev);
70 struct iio_ring_buffer *ring = indio_dev->ring;
74 size_t datasize = ring->access->get_bytes_per_datum(ring);
76 data = kmalloc(datasize , GFP_KERNEL);
78 dev_err(&st->us->dev, "memory alloc failed in ring bh");
82 if (ring->scan_count &&
83 adis16209_read_ring_data(&indio_dev->dev, st->rx) >= 0)
84 for (; i < ring->scan_count; i++)
85 data[i] = be16_to_cpup((__be16 *)&(st->rx[i*2]));
87 /* Guaranteed to be aligned with 8 byte boundary */
88 if (ring->scan_timestamp)
89 *((s64 *)(data + ((i + 3)/4)*4)) = pf->timestamp;
91 ring->access->store_to(ring, (u8 *)data, pf->timestamp);
93 iio_trigger_notify_done(indio_dev->trig);
99 void adis16209_unconfigure_ring(struct iio_dev *indio_dev)
101 iio_dealloc_pollfunc(indio_dev->pollfunc);
102 iio_sw_rb_free(indio_dev->ring);
105 static const struct iio_ring_setup_ops adis16209_ring_setup_ops = {
106 .preenable = &iio_sw_ring_preenable,
107 .postenable = &iio_triggered_ring_postenable,
108 .predisable = &iio_triggered_ring_predisable,
111 int adis16209_configure_ring(struct iio_dev *indio_dev)
114 struct iio_ring_buffer *ring;
116 ring = iio_sw_rb_allocate(indio_dev);
121 indio_dev->ring = ring;
122 /* Effectively select the ring buffer implementation */
123 ring->access = &ring_sw_access_funcs;
125 ring->scan_timestamp = true;
126 ring->setup_ops = &adis16209_ring_setup_ops;
127 ring->owner = THIS_MODULE;
129 /* Set default scan mode */
130 iio_scan_mask_set(ring, ADIS16209_SCAN_SUPPLY);
131 iio_scan_mask_set(ring, ADIS16209_SCAN_ACC_X);
132 iio_scan_mask_set(ring, ADIS16209_SCAN_ACC_Y);
133 iio_scan_mask_set(ring, ADIS16209_SCAN_AUX_ADC);
134 iio_scan_mask_set(ring, ADIS16209_SCAN_TEMP);
135 iio_scan_mask_set(ring, ADIS16209_SCAN_INCLI_X);
136 iio_scan_mask_set(ring, ADIS16209_SCAN_INCLI_Y);
137 iio_scan_mask_set(ring, ADIS16209_SCAN_ROT);
139 indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time,
140 &adis16209_trigger_handler,
146 if (indio_dev->pollfunc == NULL) {
148 goto error_iio_sw_rb_free;
151 indio_dev->modes |= INDIO_RING_TRIGGERED;
154 error_iio_sw_rb_free:
155 iio_sw_rb_free(indio_dev->ring);