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"
20 static IIO_SCAN_EL_C(in_supply, ADIS16203_SCAN_SUPPLY, ADIS16203_SUPPLY_OUT, NULL);
21 static IIO_CONST_ATTR_SCAN_EL_TYPE(in_supply, u, 12, 16);
22 static IIO_SCAN_EL_C(in0, ADIS16203_SCAN_AUX_ADC, ADIS16203_AUX_ADC, NULL);
23 static IIO_CONST_ATTR_SCAN_EL_TYPE(in0, u, 12, 16);
24 static IIO_SCAN_EL_C(temp, ADIS16203_SCAN_TEMP, ADIS16203_TEMP_OUT, NULL);
25 static IIO_CONST_ATTR_SCAN_EL_TYPE(temp, u, 12, 16);
26 static IIO_SCAN_EL_C(incli_x, ADIS16203_SCAN_INCLI_X,
27 ADIS16203_XINCL_OUT, NULL);
28 static IIO_SCAN_EL_C(incli_y, ADIS16203_SCAN_INCLI_Y,
29 ADIS16203_YINCL_OUT, NULL);
30 static IIO_CONST_ATTR_SCAN_EL_TYPE(incli, s, 14, 16);
31 static IIO_SCAN_EL_TIMESTAMP(5);
32 static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64);
34 static struct attribute *adis16203_scan_el_attrs[] = {
35 &iio_scan_el_in_supply.dev_attr.attr,
36 &iio_const_attr_in_supply_index.dev_attr.attr,
37 &iio_const_attr_in_supply_type.dev_attr.attr,
38 &iio_scan_el_in0.dev_attr.attr,
39 &iio_const_attr_in0_index.dev_attr.attr,
40 &iio_const_attr_in0_type.dev_attr.attr,
41 &iio_scan_el_temp.dev_attr.attr,
42 &iio_const_attr_temp_index.dev_attr.attr,
43 &iio_const_attr_temp_type.dev_attr.attr,
44 &iio_scan_el_incli_x.dev_attr.attr,
45 &iio_const_attr_incli_x_index.dev_attr.attr,
46 &iio_scan_el_incli_y.dev_attr.attr,
47 &iio_const_attr_incli_y_index.dev_attr.attr,
48 &iio_const_attr_incli_type.dev_attr.attr,
49 &iio_scan_el_timestamp.dev_attr.attr,
50 &iio_const_attr_timestamp_index.dev_attr.attr,
51 &iio_const_attr_timestamp_type.dev_attr.attr,
55 static struct attribute_group adis16203_scan_el_group = {
56 .attrs = adis16203_scan_el_attrs,
57 .name = "scan_elements",
61 * adis16203_read_ring_data() read data registers which will be placed into ring
62 * @dev: device associated with child of actual device (iio_dev or iio_trig)
63 * @rx: somewhere to pass back the value read
65 static int adis16203_read_ring_data(struct device *dev, u8 *rx)
67 struct spi_message msg;
68 struct iio_dev *indio_dev = dev_get_drvdata(dev);
69 struct adis16203_state *st = iio_dev_get_devdata(indio_dev);
70 struct spi_transfer xfers[ADIS16203_OUTPUTS + 1];
74 mutex_lock(&st->buf_lock);
76 spi_message_init(&msg);
78 memset(xfers, 0, sizeof(xfers));
79 for (i = 0; i <= ADIS16203_OUTPUTS; i++) {
80 xfers[i].bits_per_word = 8;
81 xfers[i].cs_change = 1;
83 xfers[i].delay_usecs = 20;
84 xfers[i].tx_buf = st->tx + 2 * i;
85 if (i < 1) /* SUPPLY_OUT: 0x02, AUX_ADC: 0x08 */
86 st->tx[2 * i] = ADIS16203_READ_REG(ADIS16203_SUPPLY_OUT + 2 * i);
88 st->tx[2 * i] = ADIS16203_READ_REG(ADIS16203_SUPPLY_OUT + 2 * i + 6);
89 st->tx[2 * i + 1] = 0;
91 xfers[i].rx_buf = rx + 2 * (i - 1);
92 spi_message_add_tail(&xfers[i], &msg);
95 ret = spi_sync(st->us, &msg);
97 dev_err(&st->us->dev, "problem when burst reading");
99 mutex_unlock(&st->buf_lock);
104 /* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device
105 * specific to be rolled into the core.
107 static irqreturn_t adis16203_trigger_handler(int irq, void *p)
109 struct iio_poll_func *pf = p;
110 struct iio_dev *indio_dev = pf->private_data;
111 struct adis16203_state *st = iio_dev_get_devdata(indio_dev);
112 struct iio_ring_buffer *ring = indio_dev->ring;
116 size_t datasize = ring->access.get_bytes_per_datum(ring);
118 data = kmalloc(datasize, GFP_KERNEL);
120 dev_err(&st->us->dev, "memory alloc failed in ring bh");
124 if (ring->scan_count)
125 if (adis16203_read_ring_data(&st->indio_dev->dev, st->rx) >= 0)
126 for (; i < ring->scan_count; i++)
127 data[i] = be16_to_cpup(
128 (__be16 *)&(st->rx[i*2]));
130 /* Guaranteed to be aligned with 8 byte boundary */
131 if (ring->scan_timestamp)
132 *((s64 *)(data + ((i + 3)/4)*4)) = pf->timestamp;
134 ring->access.store_to(ring,
138 iio_trigger_notify_done(st->indio_dev->trig);
144 void adis16203_unconfigure_ring(struct iio_dev *indio_dev)
146 kfree(indio_dev->pollfunc->name);
147 kfree(indio_dev->pollfunc);
148 iio_sw_rb_free(indio_dev->ring);
151 int adis16203_configure_ring(struct iio_dev *indio_dev)
154 struct iio_ring_buffer *ring;
156 ring = iio_sw_rb_allocate(indio_dev);
161 indio_dev->ring = ring;
162 /* Effectively select the ring buffer implementation */
163 iio_ring_sw_register_funcs(&ring->access);
165 ring->scan_el_attrs = &adis16203_scan_el_group;
166 ring->scan_timestamp = true;
167 ring->preenable = &iio_sw_ring_preenable;
168 ring->postenable = &iio_triggered_ring_postenable;
169 ring->predisable = &iio_triggered_ring_predisable;
170 ring->owner = THIS_MODULE;
172 /* Set default scan mode */
173 iio_scan_mask_set(ring, iio_scan_el_in_supply.number);
174 iio_scan_mask_set(ring, iio_scan_el_temp.number);
175 iio_scan_mask_set(ring, iio_scan_el_in0.number);
176 iio_scan_mask_set(ring, iio_scan_el_incli_x.number);
177 iio_scan_mask_set(ring, iio_scan_el_incli_y.number);
179 indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL);
180 if (indio_dev->pollfunc == NULL) {
182 goto error_iio_sw_rb_free;
184 indio_dev->pollfunc->private_data = indio_dev;
185 indio_dev->pollfunc->h = &iio_pollfunc_store_time;
186 indio_dev->pollfunc->thread = &adis16203_trigger_handler;
187 indio_dev->pollfunc->type = IRQF_ONESHOT;
188 indio_dev->pollfunc->name =
189 kasprintf(GFP_KERNEL, "adis16203_consumer%d", indio_dev->id);
190 if (indio_dev->pollfunc->name == NULL) {
192 goto error_free_poll_func;
195 indio_dev->modes |= INDIO_RING_TRIGGERED;
197 error_free_poll_func:
198 kfree(indio_dev->pollfunc);
199 error_iio_sw_rb_free:
200 iio_sw_rb_free(indio_dev->ring);
204 int adis16203_initialize_ring(struct iio_ring_buffer *ring)
206 return iio_ring_buffer_register(ring, 0);
209 void adis16203_uninitialize_ring(struct iio_ring_buffer *ring)
211 iio_ring_buffer_unregister(ring);