#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include "../iio.h"
#include "../sysfs.h"
#include "../ring_sw.h"
#include "accel.h"
#include "../trigger.h"
#include "adis16240.h"
static IIO_SCAN_EL_C(in_supply, ADIS16240_SCAN_SUPPLY,
ADIS16240_SUPPLY_OUT, NULL);
static IIO_CONST_ATTR_SCAN_EL_TYPE(in_supply, u, 10, 16);
static IIO_SCAN_EL_C(accel_x, ADIS16240_SCAN_ACC_X, ADIS16240_XACCL_OUT, NULL);
static IIO_SCAN_EL_C(accel_y, ADIS16240_SCAN_ACC_Y, ADIS16240_YACCL_OUT, NULL);
static IIO_SCAN_EL_C(accel_z, ADIS16240_SCAN_ACC_Z, ADIS16240_ZACCL_OUT, NULL);
static IIO_CONST_ATTR_SCAN_EL_TYPE(accel, s, 10, 16);
static IIO_SCAN_EL_C(in0, ADIS16240_SCAN_AUX_ADC, ADIS16240_AUX_ADC, NULL);
static IIO_CONST_ATTR_SCAN_EL_TYPE(in0, u, 10, 16);
static IIO_SCAN_EL_C(temp, ADIS16240_SCAN_TEMP, ADIS16240_TEMP_OUT, NULL);
static IIO_CONST_ATTR_SCAN_EL_TYPE(temp, u, 10, 16);
static IIO_SCAN_EL_TIMESTAMP(6);
static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64);
static struct attribute *adis16240_scan_el_attrs[] = {
&iio_scan_el_in_supply.dev_attr.attr,
&iio_const_attr_in_supply_index.dev_attr.attr,
&iio_const_attr_in_supply_type.dev_attr.attr,
&iio_scan_el_accel_x.dev_attr.attr,
&iio_const_attr_accel_x_index.dev_attr.attr,
&iio_scan_el_accel_y.dev_attr.attr,
&iio_const_attr_accel_y_index.dev_attr.attr,
&iio_scan_el_accel_z.dev_attr.attr,
&iio_const_attr_accel_z_index.dev_attr.attr,
&iio_const_attr_accel_type.dev_attr.attr,
&iio_scan_el_in0.dev_attr.attr,
&iio_const_attr_in0_index.dev_attr.attr,
&iio_const_attr_in0_type.dev_attr.attr,
&iio_scan_el_temp.dev_attr.attr,
&iio_const_attr_temp_index.dev_attr.attr,
&iio_const_attr_temp_type.dev_attr.attr,
&iio_scan_el_timestamp.dev_attr.attr,
&iio_const_attr_timestamp_index.dev_attr.attr,
&iio_const_attr_timestamp_type.dev_attr.attr,
NULL,
};
static struct attribute_group adis16240_scan_el_group = {
.attrs = adis16240_scan_el_attrs,
.name = "scan_elements",
};
/**
* adis16240_poll_func_th() top half interrupt handler called by trigger
* @private_data: iio_dev
**/
static void adis16240_poll_func_th(struct iio_dev *indio_dev, s64 time)
{
struct adis16240_state *st = iio_dev_get_devdata(indio_dev);
st->last_timestamp = time;
schedule_work(&st->work_trigger_to_ring);
}
/**
* adis16240_read_ring_data() read data registers which will be placed into ring
* @dev: device associated with child of actual device (iio_dev or iio_trig)
* @rx: somewhere to pass back the value read
**/
static int adis16240_read_ring_data(struct device *dev, u8 *rx)
{
struct spi_message msg;
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct adis16240_state *st = iio_dev_get_devdata(indio_dev);
struct spi_transfer xfers[ADIS16240_OUTPUTS + 1];
int ret;
int i;
mutex_lock(&st->buf_lock);
spi_message_init(&msg);
memset(xfers, 0, sizeof(xfers));
for (i = 0; i <= ADIS16240_OUTPUTS; i++) {
xfers[i].bits_per_word = 8;
xfers[i].cs_change = 1;
xfers[i].len = 2;
xfers[i].delay_usecs = 30;
xfers[i].tx_buf = st->tx + 2 * i;
st->tx[2 * i]
= ADIS16240_READ_REG(ADIS16240_SUPPLY_OUT + 2 * i);
st->tx[2 * i + 1] = 0;
if (i >= 1)
xfers[i].rx_buf = rx + 2 * (i - 1);
spi_message_add_tail(&xfers[i], &msg);
}
ret = spi_sync(st->us, &msg);
if (ret)
dev_err(&st->us->dev, "problem when burst reading");
mutex_unlock(&st->buf_lock);
return ret;
}
static void adis16240_trigger_bh_to_ring(struct work_struct *work_s)
{
struct adis16240_state *st
= container_of(work_s, struct adis16240_state,
work_trigger_to_ring);
struct iio_ring_buffer *ring = st->indio_dev->ring;
int i = 0;
s16 *data;
size_t datasize = ring->access.get_bytes_per_datum(ring);
data = kmalloc(datasize , GFP_KERNEL);
if (data == NULL) {
dev_err(&st->us->dev, "memory alloc failed in ring bh");
return;
}
if (ring->scan_count)
if (adis16240_read_ring_data(&st->indio_dev->dev, st->rx) >= 0)
for (; i < ring->scan_count; i++)
data[i] = be16_to_cpup(
(__be16 *)&(st->rx[i*2]));
/* Guaranteed to be aligned with 8 byte boundary */
if (ring->scan_timestamp)
*((s64 *)(data + ((i + 3)/4)*4)) = st->last_timestamp;
ring->access.store_to(ring,
(u8 *)data,
st->last_timestamp);
iio_trigger_notify_done(st->indio_dev->trig);
kfree(data);
return;
}
void adis16240_unconfigure_ring(struct iio_dev *indio_dev)
{
kfree(indio_dev->pollfunc);
iio_sw_rb_free(indio_dev->ring);
}
int adis16240_configure_ring(struct iio_dev *indio_dev)
{
int ret = 0;
struct adis16240_state *st = indio_dev->dev_data;
struct iio_ring_buffer *ring;
INIT_WORK(&st->work_trigger_to_ring, adis16240_trigger_bh_to_ring);
ring = iio_sw_rb_allocate(indio_dev);
if (!ring) {
ret = -ENOMEM;
return ret;
}
indio_dev->ring = ring;
/* Effectively select the ring buffer implementation */
iio_ring_sw_register_funcs(&ring->access);
ring->bpe = 2;
ring->scan_el_attrs = &adis16240_scan_el_group;
ring->scan_timestamp = true;
ring->preenable = &iio_sw_ring_preenable;
ring->postenable = &iio_triggered_ring_postenable;
ring->predisable = &iio_triggered_ring_predisable;
ring->owner = THIS_MODULE;
/* Set default scan mode */
iio_scan_mask_set(ring, iio_scan_el_in_supply.number);
iio_scan_mask_set(ring, iio_scan_el_accel_x.number);
iio_scan_mask_set(ring, iio_scan_el_accel_y.number);
iio_scan_mask_set(ring, iio_scan_el_accel_z.number);
iio_scan_mask_set(ring, iio_scan_el_temp.number);
iio_scan_mask_set(ring, iio_scan_el_in0.number);
ret = iio_alloc_pollfunc(indio_dev, NULL, &adis16240_poll_func_th);
if (ret)
goto error_iio_sw_rb_free;
indio_dev->modes |= INDIO_RING_TRIGGERED;
return 0;
error_iio_sw_rb_free:
iio_sw_rb_free(indio_dev->ring);
return ret;
}
