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 "adis16203.h"
21 * adis16203_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 adis16203_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 adis16203_state *st = iio_dev_get_devdata(indio_dev);
30 struct spi_transfer xfers[ADIS16203_OUTPUTS + 1];
34 mutex_lock(&st->buf_lock);
36 spi_message_init(&msg);
38 memset(xfers, 0, sizeof(xfers));
39 for (i = 0; i <= ADIS16203_OUTPUTS; i++) {
40 xfers[i].bits_per_word = 8;
41 xfers[i].cs_change = 1;
43 xfers[i].delay_usecs = 20;
44 xfers[i].tx_buf = st->tx + 2 * i;
45 if (i < 1) /* SUPPLY_OUT: 0x02, AUX_ADC: 0x08 */
46 st->tx[2 * i] = ADIS16203_READ_REG(ADIS16203_SUPPLY_OUT + 2 * i);
48 st->tx[2 * i] = ADIS16203_READ_REG(ADIS16203_SUPPLY_OUT + 2 * i + 6);
49 st->tx[2 * i + 1] = 0;
51 xfers[i].rx_buf = rx + 2 * (i - 1);
52 spi_message_add_tail(&xfers[i], &msg);
55 ret = spi_sync(st->us, &msg);
57 dev_err(&st->us->dev, "problem when burst reading");
59 mutex_unlock(&st->buf_lock);
64 /* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device
65 * specific to be rolled into the core.
67 static irqreturn_t adis16203_trigger_handler(int irq, void *p)
69 struct iio_poll_func *pf = p;
70 struct iio_dev *indio_dev = pf->private_data;
71 struct adis16203_state *st = iio_dev_get_devdata(indio_dev);
72 struct iio_ring_buffer *ring = indio_dev->ring;
76 size_t datasize = ring->access.get_bytes_per_datum(ring);
78 data = kmalloc(datasize, GFP_KERNEL);
80 dev_err(&st->us->dev, "memory alloc failed in ring bh");
85 if (adis16203_read_ring_data(&st->indio_dev->dev, st->rx) >= 0)
86 for (; i < ring->scan_count; i++)
87 data[i] = be16_to_cpup(
88 (__be16 *)&(st->rx[i*2]));
90 /* Guaranteed to be aligned with 8 byte boundary */
91 if (ring->scan_timestamp)
92 *((s64 *)(data + ((i + 3)/4)*4)) = pf->timestamp;
94 ring->access.store_to(ring,
98 iio_trigger_notify_done(st->indio_dev->trig);
104 void adis16203_unconfigure_ring(struct iio_dev *indio_dev)
106 kfree(indio_dev->pollfunc->name);
107 kfree(indio_dev->pollfunc);
108 iio_sw_rb_free(indio_dev->ring);
111 int adis16203_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 iio_ring_sw_register_funcs(&ring->access);
125 ring->scan_timestamp = true;
126 ring->preenable = &iio_sw_ring_preenable;
127 ring->postenable = &iio_triggered_ring_postenable;
128 ring->predisable = &iio_triggered_ring_predisable;
129 ring->owner = THIS_MODULE;
131 /* Set default scan mode */
132 iio_scan_mask_set(ring, ADIS16203_SCAN_SUPPLY);
133 iio_scan_mask_set(ring, ADIS16203_SCAN_TEMP);
134 iio_scan_mask_set(ring, ADIS16203_SCAN_AUX_ADC);
135 iio_scan_mask_set(ring, ADIS16203_SCAN_INCLI_X);
136 iio_scan_mask_set(ring, ADIS16203_SCAN_INCLI_Y);
138 indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL);
139 if (indio_dev->pollfunc == NULL) {
141 goto error_iio_sw_rb_free;
143 indio_dev->pollfunc->private_data = indio_dev;
144 indio_dev->pollfunc->h = &iio_pollfunc_store_time;
145 indio_dev->pollfunc->thread = &adis16203_trigger_handler;
146 indio_dev->pollfunc->type = IRQF_ONESHOT;
147 indio_dev->pollfunc->name =
148 kasprintf(GFP_KERNEL, "adis16203_consumer%d", indio_dev->id);
149 if (indio_dev->pollfunc->name == NULL) {
151 goto error_free_poll_func;
154 indio_dev->modes |= INDIO_RING_TRIGGERED;
156 error_free_poll_func:
157 kfree(indio_dev->pollfunc);
158 error_iio_sw_rb_free:
159 iio_sw_rb_free(indio_dev->ring);