1 #include <linux/interrupt.h>
3 #include <linux/mutex.h>
4 #include <linux/device.h>
5 #include <linux/kernel.h>
6 #include <linux/spi/spi.h>
7 #include <linux/slab.h>
8 #include <linux/sysfs.h>
12 #include "../ring_sw.h"
14 #include "../trigger.h"
15 #include "adis16201.h"
19 * adis16201_read_ring_data() read data registers which will be placed into ring
20 * @dev: device associated with child of actual device (iio_dev or iio_trig)
21 * @rx: somewhere to pass back the value read
23 static int adis16201_read_ring_data(struct iio_dev *indio_dev, u8 *rx)
25 struct spi_message msg;
26 struct adis16201_state *st = iio_dev_get_devdata(indio_dev);
27 struct spi_transfer xfers[ADIS16201_OUTPUTS + 1];
31 mutex_lock(&st->buf_lock);
33 spi_message_init(&msg);
35 memset(xfers, 0, sizeof(xfers));
36 for (i = 0; i <= ADIS16201_OUTPUTS; i++) {
37 xfers[i].bits_per_word = 8;
38 xfers[i].cs_change = 1;
40 xfers[i].delay_usecs = 20;
41 xfers[i].tx_buf = st->tx + 2 * i;
42 st->tx[2 * i] = ADIS16201_READ_REG(ADIS16201_SUPPLY_OUT +
44 st->tx[2 * i + 1] = 0;
46 xfers[i].rx_buf = rx + 2 * (i - 1);
47 spi_message_add_tail(&xfers[i], &msg);
50 ret = spi_sync(st->us, &msg);
52 dev_err(&st->us->dev, "problem when burst reading");
54 mutex_unlock(&st->buf_lock);
59 /* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device
60 * specific to be rolled into the core.
62 static irqreturn_t adis16201_trigger_handler(int irq, void *p)
64 struct iio_poll_func *pf = p;
65 struct iio_dev *indio_dev = pf->private_data;
66 struct adis16201_state *st = iio_dev_get_devdata(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");
80 if (adis16201_read_ring_data(st->indio_dev, st->rx) >= 0)
81 for (; i < ring->scan_count; i++)
82 data[i] = be16_to_cpup(
83 (__be16 *)&(st->rx[i*2]));
85 /* Guaranteed to be aligned with 8 byte boundary */
86 if (ring->scan_timestamp)
87 *((s64 *)(data + ((i + 3)/4)*4)) = pf->timestamp;
89 ring->access->store_to(ring, (u8 *)data, pf->timestamp);
91 iio_trigger_notify_done(st->indio_dev->trig);
97 void adis16201_unconfigure_ring(struct iio_dev *indio_dev)
99 kfree(indio_dev->pollfunc->name);
100 kfree(indio_dev->pollfunc);
101 iio_sw_rb_free(indio_dev->ring);
104 static const struct iio_ring_setup_ops adis16201_ring_setup_ops = {
105 .preenable = &iio_sw_ring_preenable,
106 .postenable = &iio_triggered_ring_postenable,
107 .predisable = &iio_triggered_ring_predisable,
110 int adis16201_configure_ring(struct iio_dev *indio_dev)
113 struct iio_ring_buffer *ring;
115 ring = iio_sw_rb_allocate(indio_dev);
120 indio_dev->ring = ring;
121 /* Effectively select the ring buffer implementation */
123 ring->scan_timestamp = true;
124 ring->access = &ring_sw_access_funcs;
125 ring->setup_ops = &adis16201_ring_setup_ops;
126 ring->owner = THIS_MODULE;
128 /* Set default scan mode */
129 iio_scan_mask_set(ring, ADIS16201_SCAN_SUPPLY);
130 iio_scan_mask_set(ring, ADIS16201_SCAN_ACC_X);
131 iio_scan_mask_set(ring, ADIS16201_SCAN_ACC_Y);
132 iio_scan_mask_set(ring, ADIS16201_SCAN_AUX_ADC);
133 iio_scan_mask_set(ring, ADIS16201_SCAN_TEMP);
134 iio_scan_mask_set(ring, ADIS16201_SCAN_INCLI_X);
135 iio_scan_mask_set(ring, ADIS16201_SCAN_INCLI_Y);
137 indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL);
138 if (indio_dev->pollfunc == NULL) {
140 goto error_iio_sw_rb_free;
142 indio_dev->pollfunc->private_data = indio_dev;
143 indio_dev->pollfunc->h = &iio_pollfunc_store_time;
144 indio_dev->pollfunc->thread = &adis16201_trigger_handler;
145 indio_dev->pollfunc->type = IRQF_ONESHOT;
146 indio_dev->pollfunc->name =
147 kasprintf(GFP_KERNEL, "adis16201_consumer%d", indio_dev->id);
148 if (indio_dev->pollfunc->name == NULL) {
150 goto error_free_poll_func;
153 indio_dev->modes |= INDIO_RING_TRIGGERED;
155 error_free_poll_func:
156 kfree(indio_dev->pollfunc);
157 error_iio_sw_rb_free:
158 iio_sw_rb_free(indio_dev->ring);