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 "adis16204.h"
19
20static IIO_SCAN_EL_C(in_supply, ADIS16204_SCAN_SUPPLY, ADIS16204_SUPPLY_OUT, NULL);
21static IIO_CONST_ATTR_SCAN_EL_TYPE(in_supply, u, 12, 16);
22static IIO_SCAN_EL_C(accel_x, ADIS16204_SCAN_ACC_X, ADIS16204_XACCL_OUT, NULL);
23static IIO_SCAN_EL_C(accel_y, ADIS16204_SCAN_ACC_Y, ADIS16204_YACCL_OUT, NULL);
24static IIO_CONST_ATTR_SCAN_EL_TYPE(accel, s, 14, 16);
25static IIO_SCAN_EL_C(in0, ADIS16204_SCAN_AUX_ADC, ADIS16204_AUX_ADC, NULL);
26static IIO_CONST_ATTR_SCAN_EL_TYPE(in0, u, 12, 16);
27static IIO_SCAN_EL_C(temp, ADIS16204_SCAN_TEMP, ADIS16204_TEMP_OUT, NULL);
28static IIO_CONST_ATTR_SCAN_EL_TYPE(temp, u, 12, 16);
29static IIO_SCAN_EL_TIMESTAMP(5);
30static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64);
31
32static struct attribute *adis16204_scan_el_attrs[] = {
33 &iio_scan_el_in_supply.dev_attr.attr,
34 &iio_const_attr_in_supply_index.dev_attr.attr,
35 &iio_const_attr_in_supply_type.dev_attr.attr,
36 &iio_scan_el_accel_x.dev_attr.attr,
37 &iio_const_attr_accel_x_index.dev_attr.attr,
38 &iio_scan_el_accel_y.dev_attr.attr,
39 &iio_const_attr_accel_y_index.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_index.dev_attr.attr,
43 &iio_const_attr_in0_type.dev_attr.attr,
44 &iio_scan_el_temp.dev_attr.attr,
45 &iio_const_attr_temp_index.dev_attr.attr,
46 &iio_const_attr_temp_type.dev_attr.attr,
47 &iio_scan_el_timestamp.dev_attr.attr,
48 &iio_const_attr_timestamp_index.dev_attr.attr,
49 &iio_const_attr_timestamp_type.dev_attr.attr,
50 NULL,
51};
52
53static struct attribute_group adis16204_scan_el_group = {
54 .attrs = adis16204_scan_el_attrs,
55 .name = "scan_elements",
56};
57
58
59
60
61
62static void adis16204_poll_func_th(struct iio_dev *indio_dev, s64 timestamp)
63{
64 struct adis16204_state *st = iio_dev_get_devdata(indio_dev);
65 st->last_timestamp = timestamp;
66 schedule_work(&st->work_trigger_to_ring);
67}
68
69
70
71
72
73
74static int adis16204_read_ring_data(struct device *dev, u8 *rx)
75{
76 struct spi_message msg;
77 struct iio_dev *indio_dev = dev_get_drvdata(dev);
78 struct adis16204_state *st = iio_dev_get_devdata(indio_dev);
79 struct spi_transfer xfers[ADIS16204_OUTPUTS + 1];
80 int ret;
81 int i;
82
83 mutex_lock(&st->buf_lock);
84
85 spi_message_init(&msg);
86
87 memset(xfers, 0, sizeof(xfers));
88 for (i = 0; i <= ADIS16204_OUTPUTS; i++) {
89 xfers[i].bits_per_word = 8;
90 xfers[i].cs_change = 1;
91 xfers[i].len = 2;
92 xfers[i].delay_usecs = 20;
93 xfers[i].tx_buf = st->tx + 2 * i;
94 st->tx[2 * i] = ADIS16204_READ_REG(ADIS16204_SUPPLY_OUT + 2 * i);
95 st->tx[2 * i + 1] = 0;
96 if (i >= 1)
97 xfers[i].rx_buf = rx + 2 * (i - 1);
98 spi_message_add_tail(&xfers[i], &msg);
99 }
100
101 ret = spi_sync(st->us, &msg);
102 if (ret)
103 dev_err(&st->us->dev, "problem when burst reading");
104
105 mutex_unlock(&st->buf_lock);
106
107 return ret;
108}
109
110
111
112
113static void adis16204_trigger_bh_to_ring(struct work_struct *work_s)
114{
115 struct adis16204_state *st
116 = container_of(work_s, struct adis16204_state,
117 work_trigger_to_ring);
118 struct iio_ring_buffer *ring = st->indio_dev->ring;
119
120 int i = 0;
121 s16 *data;
122 size_t datasize = ring->access.get_bytes_per_datum(ring);
123
124 data = kmalloc(datasize, GFP_KERNEL);
125 if (data == NULL) {
126 dev_err(&st->us->dev, "memory alloc failed in ring bh");
127 return;
128 }
129
130 if (ring->scan_count)
131 if (adis16204_read_ring_data(&st->indio_dev->dev, st->rx) >= 0)
132 for (; i < ring->scan_count; i++)
133 data[i] = be16_to_cpup(
134 (__be16 *)&(st->rx[i*2]));
135
136
137 if (ring->scan_timestamp)
138 *((s64 *)(data + ((i + 3)/4)*4)) = st->last_timestamp;
139
140 ring->access.store_to(ring,
141 (u8 *)data,
142 st->last_timestamp);
143
144 iio_trigger_notify_done(st->indio_dev->trig);
145 kfree(data);
146
147 return;
148}
149
150void adis16204_unconfigure_ring(struct iio_dev *indio_dev)
151{
152 kfree(indio_dev->pollfunc);
153 iio_sw_rb_free(indio_dev->ring);
154}
155
156int adis16204_configure_ring(struct iio_dev *indio_dev)
157{
158 int ret = 0;
159 struct adis16204_state *st = indio_dev->dev_data;
160 struct iio_ring_buffer *ring;
161 INIT_WORK(&st->work_trigger_to_ring, adis16204_trigger_bh_to_ring);
162
163 ring = iio_sw_rb_allocate(indio_dev);
164 if (!ring) {
165 ret = -ENOMEM;
166 return ret;
167 }
168 indio_dev->ring = ring;
169
170 iio_ring_sw_register_funcs(&ring->access);
171 ring->bpe = 2;
172 ring->scan_el_attrs = &adis16204_scan_el_group;
173 ring->scan_timestamp = true;
174 ring->preenable = &iio_sw_ring_preenable;
175 ring->postenable = &iio_triggered_ring_postenable;
176 ring->predisable = &iio_triggered_ring_predisable;
177 ring->owner = THIS_MODULE;
178
179
180 iio_scan_mask_set(ring, iio_scan_el_in_supply.number);
181 iio_scan_mask_set(ring, iio_scan_el_accel_x.number);
182 iio_scan_mask_set(ring, iio_scan_el_accel_y.number);
183 iio_scan_mask_set(ring, iio_scan_el_temp.number);
184 iio_scan_mask_set(ring, iio_scan_el_in0.number);
185
186 ret = iio_alloc_pollfunc(indio_dev, NULL, &adis16204_poll_func_th);
187 if (ret)
188 goto error_iio_sw_rb_free;
189
190 indio_dev->modes |= INDIO_RING_TRIGGERED;
191 return 0;
192
193error_iio_sw_rb_free:
194 iio_sw_rb_free(indio_dev->ring);
195 return ret;
196}
197
198int adis16204_initialize_ring(struct iio_ring_buffer *ring)
199{
200 return iio_ring_buffer_register(ring, 0);
201}
202
203void adis16204_uninitialize_ring(struct iio_ring_buffer *ring)
204{
205 iio_ring_buffer_unregister(ring);
206}
207
