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"
20 static IIO_SCAN_EL_C(in_supply, ADIS16240_SCAN_SUPPLY,
21 ADIS16240_SUPPLY_OUT, NULL);
22 static IIO_CONST_ATTR_SCAN_EL_TYPE(in_supply, u, 10, 16);
23 static IIO_SCAN_EL_C(accel_x, ADIS16240_SCAN_ACC_X, ADIS16240_XACCL_OUT, NULL);
24 static IIO_SCAN_EL_C(accel_y, ADIS16240_SCAN_ACC_Y, ADIS16240_YACCL_OUT, NULL);
25 static IIO_SCAN_EL_C(accel_z, ADIS16240_SCAN_ACC_Z, ADIS16240_ZACCL_OUT, NULL);
26 static IIO_CONST_ATTR_SCAN_EL_TYPE(accel, s, 10, 16);
27 static IIO_SCAN_EL_C(in0, ADIS16240_SCAN_AUX_ADC, ADIS16240_AUX_ADC, NULL);
28 static IIO_CONST_ATTR_SCAN_EL_TYPE(in0, u, 10, 16);
29 static IIO_SCAN_EL_C(temp, ADIS16240_SCAN_TEMP, ADIS16240_TEMP_OUT, NULL);
30 static IIO_CONST_ATTR_SCAN_EL_TYPE(temp, u, 10, 16);
31 static IIO_SCAN_EL_TIMESTAMP(6);
32 static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64);
34 static struct attribute *adis16240_scan_el_attrs[] = {
35 &iio_scan_el_in_supply.dev_attr.attr,
36 &iio_const_attr_in_supply_type.dev_attr.attr,
37 &iio_scan_el_accel_x.dev_attr.attr,
38 &iio_scan_el_accel_y.dev_attr.attr,
39 &iio_scan_el_accel_z.dev_attr.attr,
40 &iio_const_attr_accel_type.dev_attr.attr,
41 &iio_scan_el_in0.dev_attr.attr,
42 &iio_const_attr_in0_type.dev_attr.attr,
43 &iio_scan_el_temp.dev_attr.attr,
44 &iio_const_attr_temp_type.dev_attr.attr,
45 &iio_scan_el_timestamp.dev_attr.attr,
46 &iio_const_attr_timestamp_type.dev_attr.attr,
50 static struct attribute_group adis16240_scan_el_group = {
51 .attrs = adis16240_scan_el_attrs,
52 .name = "scan_elements",
56 * adis16240_poll_func_th() top half interrupt handler called by trigger
57 * @private_data: iio_dev
59 static void adis16240_poll_func_th(struct iio_dev *indio_dev, s64 time)
61 struct adis16240_state *st = iio_dev_get_devdata(indio_dev);
62 st->last_timestamp = time;
63 schedule_work(&st->work_trigger_to_ring);
67 * adis16240_read_ring_data() read data registers which will be placed into ring
68 * @dev: device associated with child of actual device (iio_dev or iio_trig)
69 * @rx: somewhere to pass back the value read
71 static int adis16240_read_ring_data(struct device *dev, u8 *rx)
73 struct spi_message msg;
74 struct iio_dev *indio_dev = dev_get_drvdata(dev);
75 struct adis16240_state *st = iio_dev_get_devdata(indio_dev);
76 struct spi_transfer xfers[ADIS16240_OUTPUTS + 1];
80 mutex_lock(&st->buf_lock);
82 spi_message_init(&msg);
84 memset(xfers, 0, sizeof(xfers));
85 for (i = 0; i <= ADIS16240_OUTPUTS; i++) {
86 xfers[i].bits_per_word = 8;
87 xfers[i].cs_change = 1;
89 xfers[i].delay_usecs = 30;
90 xfers[i].tx_buf = st->tx + 2 * i;
92 = ADIS16240_READ_REG(ADIS16240_SUPPLY_OUT + 2 * i);
93 st->tx[2 * i + 1] = 0;
95 xfers[i].rx_buf = rx + 2 * (i - 1);
96 spi_message_add_tail(&xfers[i], &msg);
99 ret = spi_sync(st->us, &msg);
101 dev_err(&st->us->dev, "problem when burst reading");
103 mutex_unlock(&st->buf_lock);
109 static void adis16240_trigger_bh_to_ring(struct work_struct *work_s)
111 struct adis16240_state *st
112 = container_of(work_s, struct adis16240_state,
113 work_trigger_to_ring);
114 struct iio_ring_buffer *ring = st->indio_dev->ring;
118 size_t datasize = ring->access.get_bytes_per_datum(ring);
120 data = kmalloc(datasize , GFP_KERNEL);
122 dev_err(&st->us->dev, "memory alloc failed in ring bh");
126 if (ring->scan_count)
127 if (adis16240_read_ring_data(&st->indio_dev->dev, st->rx) >= 0)
128 for (; i < ring->scan_count; i++)
129 data[i] = be16_to_cpup(
130 (__be16 *)&(st->rx[i*2]));
132 /* Guaranteed to be aligned with 8 byte boundary */
133 if (ring->scan_timestamp)
134 *((s64 *)(data + ((i + 3)/4)*4)) = st->last_timestamp;
136 ring->access.store_to(ring,
140 iio_trigger_notify_done(st->indio_dev->trig);
146 void adis16240_unconfigure_ring(struct iio_dev *indio_dev)
148 kfree(indio_dev->pollfunc);
149 iio_sw_rb_free(indio_dev->ring);
152 int adis16240_configure_ring(struct iio_dev *indio_dev)
155 struct adis16240_state *st = indio_dev->dev_data;
156 struct iio_ring_buffer *ring;
157 INIT_WORK(&st->work_trigger_to_ring, adis16240_trigger_bh_to_ring);
159 ring = iio_sw_rb_allocate(indio_dev);
164 indio_dev->ring = ring;
165 /* Effectively select the ring buffer implementation */
166 iio_ring_sw_register_funcs(&ring->access);
168 ring->scan_el_attrs = &adis16240_scan_el_group;
169 ring->scan_timestamp = true;
170 ring->preenable = &iio_sw_ring_preenable;
171 ring->postenable = &iio_triggered_ring_postenable;
172 ring->predisable = &iio_triggered_ring_predisable;
173 ring->owner = THIS_MODULE;
175 /* Set default scan mode */
176 iio_scan_mask_set(ring, iio_scan_el_in_supply.number);
177 iio_scan_mask_set(ring, iio_scan_el_accel_x.number);
178 iio_scan_mask_set(ring, iio_scan_el_accel_y.number);
179 iio_scan_mask_set(ring, iio_scan_el_accel_z.number);
180 iio_scan_mask_set(ring, iio_scan_el_temp.number);
181 iio_scan_mask_set(ring, iio_scan_el_in0.number);
183 ret = iio_alloc_pollfunc(indio_dev, NULL, &adis16240_poll_func_th);
185 goto error_iio_sw_rb_free;
187 indio_dev->modes |= INDIO_RING_TRIGGERED;
190 error_iio_sw_rb_free:
191 iio_sw_rb_free(indio_dev->ring);