1#include <linux/interrupt.h>
2#include <linux/irq.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>
12
13#include "../iio.h"
14#include "../sysfs.h"
15#include "../ring_sw.h"
16#include "accel.h"
17#include "../trigger.h"
18#include "adis16240.h"
19
20static IIO_SCAN_EL_C(in_supply, ADIS16240_SCAN_SUPPLY,
21 ADIS16240_SUPPLY_OUT, NULL);
22static IIO_CONST_ATTR_SCAN_EL_TYPE(in_supply, u, 10, 16);
23static IIO_SCAN_EL_C(accel_x, ADIS16240_SCAN_ACC_X, ADIS16240_XACCL_OUT, NULL);
24static IIO_SCAN_EL_C(accel_y, ADIS16240_SCAN_ACC_Y, ADIS16240_YACCL_OUT, NULL);
25static IIO_SCAN_EL_C(accel_z, ADIS16240_SCAN_ACC_Z, ADIS16240_ZACCL_OUT, NULL);
26static IIO_CONST_ATTR_SCAN_EL_TYPE(accel, s, 10, 16);
27static IIO_SCAN_EL_C(in0, ADIS16240_SCAN_AUX_ADC, ADIS16240_AUX_ADC, NULL);
28static IIO_CONST_ATTR_SCAN_EL_TYPE(in0, u, 10, 16);
29static IIO_SCAN_EL_C(temp, ADIS16240_SCAN_TEMP, ADIS16240_TEMP_OUT, NULL);
30static IIO_CONST_ATTR_SCAN_EL_TYPE(temp, u, 10, 16);
31static IIO_SCAN_EL_TIMESTAMP(6);
32static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64);
33
34static struct attribute *adis16240_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_accel_x.dev_attr.attr,
39 &iio_const_attr_accel_x_index.dev_attr.attr,
40 &iio_scan_el_accel_y.dev_attr.attr,
41 &iio_const_attr_accel_y_index.dev_attr.attr,
42 &iio_scan_el_accel_z.dev_attr.attr,
43 &iio_const_attr_accel_z_index.dev_attr.attr,
44 &iio_const_attr_accel_type.dev_attr.attr,
45 &iio_scan_el_in0.dev_attr.attr,
46 &iio_const_attr_in0_index.dev_attr.attr,
47 &iio_const_attr_in0_type.dev_attr.attr,
48 &iio_scan_el_temp.dev_attr.attr,
49 &iio_const_attr_temp_index.dev_attr.attr,
50 &iio_const_attr_temp_type.dev_attr.attr,
51 &iio_scan_el_timestamp.dev_attr.attr,
52 &iio_const_attr_timestamp_index.dev_attr.attr,
53 &iio_const_attr_timestamp_type.dev_attr.attr,
54 NULL,
55};
56
57static struct attribute_group adis16240_scan_el_group = {
58 .attrs = adis16240_scan_el_attrs,
59 .name = "scan_elements",
60};
61
62
63
64
65
66static void adis16240_poll_func_th(struct iio_dev *indio_dev, s64 time)
67{
68 struct adis16240_state *st = iio_dev_get_devdata(indio_dev);
69 st->last_timestamp = time;
70 schedule_work(&st->work_trigger_to_ring);
71}
72
73
74
75
76
77
78static int adis16240_read_ring_data(struct device *dev, u8 *rx)
79{
80 struct spi_message msg;
81 struct iio_dev *indio_dev = dev_get_drvdata(dev);
82 struct adis16240_state *st = iio_dev_get_devdata(indio_dev);
83 struct spi_transfer xfers[ADIS16240_OUTPUTS + 1];
84 int ret;
85 int i;
86
87 mutex_lock(&st->buf_lock);
88
89 spi_message_init(&msg);
90
91 memset(xfers, 0, sizeof(xfers));
92 for (i = 0; i <= ADIS16240_OUTPUTS; i++) {
93 xfers[i].bits_per_word = 8;
94 xfers[i].cs_change = 1;
95 xfers[i].len = 2;
96 xfers[i].delay_usecs = 30;
97 xfers[i].tx_buf = st->tx + 2 * i;
98 st->tx[2 * i]
99 = ADIS16240_READ_REG(ADIS16240_SUPPLY_OUT + 2 * i);
100 st->tx[2 * i + 1] = 0;
101 if (i >= 1)
102 xfers[i].rx_buf = rx + 2 * (i - 1);
103 spi_message_add_tail(&xfers[i], &msg);
104 }
105
106 ret = spi_sync(st->us, &msg);
107 if (ret)
108 dev_err(&st->us->dev, "problem when burst reading");
109
110 mutex_unlock(&st->buf_lock);
111
112 return ret;
113}
114
115
116static void adis16240_trigger_bh_to_ring(struct work_struct *work_s)
117{
118 struct adis16240_state *st
119 = container_of(work_s, struct adis16240_state,
120 work_trigger_to_ring);
121 struct iio_ring_buffer *ring = st->indio_dev->ring;
122
123 int i = 0;
124 s16 *data;
125 size_t datasize = ring->access.get_bytes_per_datum(ring);
126
127 data = kmalloc(datasize , GFP_KERNEL);
128 if (data == NULL) {
129 dev_err(&st->us->dev, "memory alloc failed in ring bh");
130 return;
131 }
132
133 if (ring->scan_count)
134 if (adis16240_read_ring_data(&st->indio_dev->dev, st->rx) >= 0)
135 for (; i < ring->scan_count; i++)
136 data[i] = be16_to_cpup(
137 (__be16 *)&(st->rx[i*2]));
138
139
140 if (ring->scan_timestamp)
141 *((s64 *)(data + ((i + 3)/4)*4)) = st->last_timestamp;
142
143 ring->access.store_to(ring,
144 (u8 *)data,
145 st->last_timestamp);
146
147 iio_trigger_notify_done(st->indio_dev->trig);
148 kfree(data);
149
150 return;
151}
152
153void adis16240_unconfigure_ring(struct iio_dev *indio_dev)
154{
155 kfree(indio_dev->pollfunc);
156 iio_sw_rb_free(indio_dev->ring);
157}
158
159int adis16240_configure_ring(struct iio_dev *indio_dev)
160{
161 int ret = 0;
162 struct adis16240_state *st = indio_dev->dev_data;
163 struct iio_ring_buffer *ring;
164 INIT_WORK(&st->work_trigger_to_ring, adis16240_trigger_bh_to_ring);
165
166 ring = iio_sw_rb_allocate(indio_dev);
167 if (!ring) {
168 ret = -ENOMEM;
169 return ret;
170 }
171 indio_dev->ring = ring;
172
173 iio_ring_sw_register_funcs(&ring->access);
174 ring->bpe = 2;
175 ring->scan_el_attrs = &adis16240_scan_el_group;
176 ring->scan_timestamp = true;
177 ring->preenable = &iio_sw_ring_preenable;
178 ring->postenable = &iio_triggered_ring_postenable;
179 ring->predisable = &iio_triggered_ring_predisable;
180 ring->owner = THIS_MODULE;
181
182
183 iio_scan_mask_set(ring, iio_scan_el_in_supply.number);
184 iio_scan_mask_set(ring, iio_scan_el_accel_x.number);
185 iio_scan_mask_set(ring, iio_scan_el_accel_y.number);
186 iio_scan_mask_set(ring, iio_scan_el_accel_z.number);
187 iio_scan_mask_set(ring, iio_scan_el_temp.number);
188 iio_scan_mask_set(ring, iio_scan_el_in0.number);
189
190 ret = iio_alloc_pollfunc(indio_dev, NULL, &adis16240_poll_func_th);
191 if (ret)
192 goto error_iio_sw_rb_free;
193
194 indio_dev->modes |= INDIO_RING_TRIGGERED;
195 return 0;
196
197error_iio_sw_rb_free:
198 iio_sw_rb_free(indio_dev->ring);
199 return ret;
200}
201
202
