207 lines
5.9 KiB
C
207 lines
5.9 KiB
C
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/gpio.h>
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#include <linux/workqueue.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/spi/spi.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/list.h>
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#include "../iio.h"
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#include "../sysfs.h"
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#include "../ring_sw.h"
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#include "accel.h"
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#include "../trigger.h"
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#include "adis16204.h"
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static IIO_SCAN_EL_C(in_supply, ADIS16204_SCAN_SUPPLY, ADIS16204_SUPPLY_OUT, NULL);
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static IIO_CONST_ATTR_SCAN_EL_TYPE(in_supply, u, 12, 16);
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static IIO_SCAN_EL_C(accel_x, ADIS16204_SCAN_ACC_X, ADIS16204_XACCL_OUT, NULL);
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static IIO_SCAN_EL_C(accel_y, ADIS16204_SCAN_ACC_Y, ADIS16204_YACCL_OUT, NULL);
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static IIO_CONST_ATTR_SCAN_EL_TYPE(accel, s, 14, 16);
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static IIO_SCAN_EL_C(in0, ADIS16204_SCAN_AUX_ADC, ADIS16204_AUX_ADC, NULL);
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static IIO_CONST_ATTR_SCAN_EL_TYPE(in0, u, 12, 16);
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static IIO_SCAN_EL_C(temp, ADIS16204_SCAN_TEMP, ADIS16204_TEMP_OUT, NULL);
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static IIO_CONST_ATTR_SCAN_EL_TYPE(temp, u, 12, 16);
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static IIO_SCAN_EL_TIMESTAMP(5);
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static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64);
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static struct attribute *adis16204_scan_el_attrs[] = {
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&iio_scan_el_in_supply.dev_attr.attr,
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&iio_const_attr_in_supply_index.dev_attr.attr,
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&iio_const_attr_in_supply_type.dev_attr.attr,
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&iio_scan_el_accel_x.dev_attr.attr,
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&iio_const_attr_accel_x_index.dev_attr.attr,
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&iio_scan_el_accel_y.dev_attr.attr,
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&iio_const_attr_accel_y_index.dev_attr.attr,
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&iio_const_attr_accel_type.dev_attr.attr,
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&iio_scan_el_in0.dev_attr.attr,
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&iio_const_attr_in0_index.dev_attr.attr,
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&iio_const_attr_in0_type.dev_attr.attr,
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&iio_scan_el_temp.dev_attr.attr,
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&iio_const_attr_temp_index.dev_attr.attr,
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&iio_const_attr_temp_type.dev_attr.attr,
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&iio_scan_el_timestamp.dev_attr.attr,
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&iio_const_attr_timestamp_index.dev_attr.attr,
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&iio_const_attr_timestamp_type.dev_attr.attr,
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NULL,
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};
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static struct attribute_group adis16204_scan_el_group = {
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.attrs = adis16204_scan_el_attrs,
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.name = "scan_elements",
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};
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/**
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* adis16204_poll_func_th() top half interrupt handler called by trigger
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* @private_data: iio_dev
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**/
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static void adis16204_poll_func_th(struct iio_dev *indio_dev, s64 timestamp)
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{
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struct adis16204_state *st = iio_dev_get_devdata(indio_dev);
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st->last_timestamp = timestamp;
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schedule_work(&st->work_trigger_to_ring);
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}
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/**
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* adis16204_read_ring_data() read data registers which will be placed into ring
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* @dev: device associated with child of actual device (iio_dev or iio_trig)
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* @rx: somewhere to pass back the value read
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**/
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static int adis16204_read_ring_data(struct device *dev, u8 *rx)
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{
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struct spi_message msg;
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct adis16204_state *st = iio_dev_get_devdata(indio_dev);
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struct spi_transfer xfers[ADIS16204_OUTPUTS + 1];
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int ret;
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int i;
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mutex_lock(&st->buf_lock);
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spi_message_init(&msg);
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memset(xfers, 0, sizeof(xfers));
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for (i = 0; i <= ADIS16204_OUTPUTS; i++) {
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xfers[i].bits_per_word = 8;
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xfers[i].cs_change = 1;
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xfers[i].len = 2;
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xfers[i].delay_usecs = 20;
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xfers[i].tx_buf = st->tx + 2 * i;
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st->tx[2 * i] = ADIS16204_READ_REG(ADIS16204_SUPPLY_OUT + 2 * i);
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st->tx[2 * i + 1] = 0;
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if (i >= 1)
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xfers[i].rx_buf = rx + 2 * (i - 1);
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spi_message_add_tail(&xfers[i], &msg);
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}
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ret = spi_sync(st->us, &msg);
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if (ret)
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dev_err(&st->us->dev, "problem when burst reading");
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mutex_unlock(&st->buf_lock);
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return ret;
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}
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/* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device
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* specific to be rolled into the core.
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*/
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static void adis16204_trigger_bh_to_ring(struct work_struct *work_s)
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{
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struct adis16204_state *st
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= container_of(work_s, struct adis16204_state,
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work_trigger_to_ring);
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struct iio_ring_buffer *ring = st->indio_dev->ring;
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int i = 0;
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s16 *data;
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size_t datasize = ring->access.get_bytes_per_datum(ring);
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data = kmalloc(datasize, GFP_KERNEL);
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if (data == NULL) {
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dev_err(&st->us->dev, "memory alloc failed in ring bh");
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return;
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}
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if (ring->scan_count)
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if (adis16204_read_ring_data(&st->indio_dev->dev, st->rx) >= 0)
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for (; i < ring->scan_count; i++)
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data[i] = be16_to_cpup(
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(__be16 *)&(st->rx[i*2]));
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/* Guaranteed to be aligned with 8 byte boundary */
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if (ring->scan_timestamp)
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*((s64 *)(data + ((i + 3)/4)*4)) = st->last_timestamp;
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ring->access.store_to(ring,
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(u8 *)data,
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st->last_timestamp);
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iio_trigger_notify_done(st->indio_dev->trig);
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kfree(data);
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return;
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}
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void adis16204_unconfigure_ring(struct iio_dev *indio_dev)
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{
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kfree(indio_dev->pollfunc);
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iio_sw_rb_free(indio_dev->ring);
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}
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int adis16204_configure_ring(struct iio_dev *indio_dev)
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{
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int ret = 0;
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struct adis16204_state *st = indio_dev->dev_data;
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struct iio_ring_buffer *ring;
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INIT_WORK(&st->work_trigger_to_ring, adis16204_trigger_bh_to_ring);
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ring = iio_sw_rb_allocate(indio_dev);
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if (!ring) {
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ret = -ENOMEM;
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return ret;
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}
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indio_dev->ring = ring;
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/* Effectively select the ring buffer implementation */
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iio_ring_sw_register_funcs(&ring->access);
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ring->bpe = 2;
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ring->scan_el_attrs = &adis16204_scan_el_group;
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ring->scan_timestamp = true;
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ring->preenable = &iio_sw_ring_preenable;
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ring->postenable = &iio_triggered_ring_postenable;
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ring->predisable = &iio_triggered_ring_predisable;
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ring->owner = THIS_MODULE;
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/* Set default scan mode */
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iio_scan_mask_set(ring, iio_scan_el_in_supply.number);
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iio_scan_mask_set(ring, iio_scan_el_accel_x.number);
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iio_scan_mask_set(ring, iio_scan_el_accel_y.number);
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iio_scan_mask_set(ring, iio_scan_el_temp.number);
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iio_scan_mask_set(ring, iio_scan_el_in0.number);
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ret = iio_alloc_pollfunc(indio_dev, NULL, &adis16204_poll_func_th);
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if (ret)
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goto error_iio_sw_rb_free;
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indio_dev->modes |= INDIO_RING_TRIGGERED;
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return 0;
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error_iio_sw_rb_free:
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iio_sw_rb_free(indio_dev->ring);
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return ret;
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}
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int adis16204_initialize_ring(struct iio_ring_buffer *ring)
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{
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return iio_ring_buffer_register(ring, 0);
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}
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void adis16204_uninitialize_ring(struct iio_ring_buffer *ring)
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{
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iio_ring_buffer_unregister(ring);
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}
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