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_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,
57 static struct attribute_group adis16240_scan_el_group = {
58 .attrs = adis16240_scan_el_attrs,
59 .name = "scan_elements",
63 * adis16240_read_ring_data() read data registers which will be placed into ring
64 * @dev: device associated with child of actual device (iio_dev or iio_trig)
65 * @rx: somewhere to pass back the value read
67 static int adis16240_read_ring_data(struct device *dev, u8 *rx)
69 struct spi_message msg;
70 struct iio_dev *indio_dev = dev_get_drvdata(dev);
71 struct adis16240_state *st = iio_dev_get_devdata(indio_dev);
72 struct spi_transfer xfers[ADIS16240_OUTPUTS + 1];
76 mutex_lock(&st->buf_lock);
78 spi_message_init(&msg);
80 memset(xfers, 0, sizeof(xfers));
81 for (i = 0; i <= ADIS16240_OUTPUTS; i++) {
82 xfers[i].bits_per_word = 8;
83 xfers[i].cs_change = 1;
85 xfers[i].delay_usecs = 30;
86 xfers[i].tx_buf = st->tx + 2 * i;
88 = ADIS16240_READ_REG(ADIS16240_SUPPLY_OUT + 2 * i);
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 static irqreturn_t adis16240_trigger_handler(int irq, void *p)
106 struct iio_poll_func *pf = p;
107 struct iio_dev *indio_dev = pf->private_data;
108 struct adis16240_state *st = iio_dev_get_devdata(indio_dev);
109 struct iio_ring_buffer *ring = indio_dev->ring;
113 size_t datasize = ring->access.get_bytes_per_datum(ring);
115 data = kmalloc(datasize, GFP_KERNEL);
117 dev_err(&st->us->dev, "memory alloc failed in ring bh");
121 if (ring->scan_count &&
122 adis16240_read_ring_data(&st->indio_dev->dev, st->rx) >= 0)
123 for (; i < ring->scan_count; i++)
124 data[i] = be16_to_cpup((__be16 *)&(st->rx[i*2]));
126 /* Guaranteed to be aligned with 8 byte boundary */
127 if (ring->scan_timestamp)
128 *((s64 *)(data + ((i + 3)/4)*4)) = pf->timestamp;
130 ring->access.store_to(ring, (u8 *)data, pf->timestamp);
132 iio_trigger_notify_done(st->indio_dev->trig);
138 void adis16240_unconfigure_ring(struct iio_dev *indio_dev)
140 kfree(indio_dev->pollfunc->name);
141 kfree(indio_dev->pollfunc);
142 iio_sw_rb_free(indio_dev->ring);
145 int adis16240_configure_ring(struct iio_dev *indio_dev)
148 struct iio_ring_buffer *ring;
150 ring = iio_sw_rb_allocate(indio_dev);
155 indio_dev->ring = ring;
156 /* Effectively select the ring buffer implementation */
157 iio_ring_sw_register_funcs(&ring->access);
159 ring->scan_el_attrs = &adis16240_scan_el_group;
160 ring->scan_timestamp = true;
161 ring->preenable = &iio_sw_ring_preenable;
162 ring->postenable = &iio_triggered_ring_postenable;
163 ring->predisable = &iio_triggered_ring_predisable;
164 ring->owner = THIS_MODULE;
166 /* Set default scan mode */
167 iio_scan_mask_set(ring, iio_scan_el_in_supply.number);
168 iio_scan_mask_set(ring, iio_scan_el_accel_x.number);
169 iio_scan_mask_set(ring, iio_scan_el_accel_y.number);
170 iio_scan_mask_set(ring, iio_scan_el_accel_z.number);
171 iio_scan_mask_set(ring, iio_scan_el_temp.number);
172 iio_scan_mask_set(ring, iio_scan_el_in0.number);
174 indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL);
175 if (indio_dev->pollfunc == NULL) {
177 goto error_iio_sw_rb_free;
179 indio_dev->pollfunc->private_data = indio_dev;
180 indio_dev->pollfunc->h = &iio_pollfunc_store_time;
181 indio_dev->pollfunc->thread = &adis16240_trigger_handler;
182 indio_dev->pollfunc->type = IRQF_ONESHOT;
183 indio_dev->pollfunc->name =
184 kasprintf(GFP_KERNEL, "adis16240_consumer%d", indio_dev->id);
185 if (indio_dev->pollfunc->name == NULL) {
187 goto error_free_poll_func;
189 indio_dev->modes |= INDIO_RING_TRIGGERED;
191 error_free_poll_func:
192 kfree(indio_dev->pollfunc);
193 error_iio_sw_rb_free:
194 iio_sw_rb_free(indio_dev->ring);