--- /dev/null
+#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 "adis16201.h"
+
+static IIO_SCAN_EL_C(in_supply, ADIS16201_SCAN_SUPPLY, ADIS16201_SUPPLY_OUT, NULL);
+static IIO_CONST_ATTR_SCAN_EL_TYPE(in_supply, u, 12, 16);
+static IIO_SCAN_EL_C(accel_x, ADIS16201_SCAN_ACC_X, ADIS16201_XACCL_OUT, NULL);
+static IIO_SCAN_EL_C(accel_y, ADIS16201_SCAN_ACC_Y, ADIS16201_YACCL_OUT, NULL);
+static IIO_CONST_ATTR_SCAN_EL_TYPE(accel, s, 14, 16);
+static IIO_SCAN_EL_C(in0, ADIS16201_SCAN_AUX_ADC, ADIS16201_AUX_ADC, NULL);
+static IIO_CONST_ATTR_SCAN_EL_TYPE(in0, u, 12, 16);
+static IIO_SCAN_EL_C(temp, ADIS16201_SCAN_TEMP, ADIS16201_TEMP_OUT, NULL);
+static IIO_CONST_ATTR_SCAN_EL_TYPE(temp, u, 12, 16);
+static IIO_SCAN_EL_C(incli_x, ADIS16201_SCAN_INCLI_X,
+ ADIS16201_XINCL_OUT, NULL);
+static IIO_SCAN_EL_C(incli_y, ADIS16201_SCAN_INCLI_Y,
+ ADIS16201_YINCL_OUT, NULL);
+static IIO_CONST_ATTR_SCAN_EL_TYPE(incli, s, 14, 16);
+static IIO_SCAN_EL_TIMESTAMP(7);
+static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64);
+
+static struct attribute *adis16201_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_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_incli_x.dev_attr.attr,
+ &iio_const_attr_incli_x_index.dev_attr.attr,
+ &iio_scan_el_incli_y.dev_attr.attr,
+ &iio_const_attr_incli_y_index.dev_attr.attr,
+ &iio_const_attr_incli_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 adis16201_scan_el_group = {
+ .attrs = adis16201_scan_el_attrs,
+ .name = "scan_elements",
+};
+
+/**
+ * adis16201_poll_func_th() top half interrupt handler called by trigger
+ * @private_data: iio_dev
+ **/
+static void adis16201_poll_func_th(struct iio_dev *indio_dev, s64 time)
+{
+ struct adis16201_state *st = iio_dev_get_devdata(indio_dev);
+ st->last_timestamp = time;
+ schedule_work(&st->work_trigger_to_ring);
+}
+
+/**
+ * adis16201_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 adis16201_read_ring_data(struct device *dev, u8 *rx)
+{
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct adis16201_state *st = iio_dev_get_devdata(indio_dev);
+ struct spi_transfer xfers[ADIS16201_OUTPUTS + 1];
+ int ret;
+ int i;
+
+ mutex_lock(&st->buf_lock);
+
+ spi_message_init(&msg);
+
+ memset(xfers, 0, sizeof(xfers));
+ for (i = 0; i <= ADIS16201_OUTPUTS; i++) {
+ xfers[i].bits_per_word = 8;
+ xfers[i].cs_change = 1;
+ xfers[i].len = 2;
+ xfers[i].delay_usecs = 20;
+ xfers[i].tx_buf = st->tx + 2 * i;
+ st->tx[2 * i] = ADIS16201_READ_REG(ADIS16201_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;
+}
+
+/* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device
+ * specific to be rolled into the core.
+ */
+static void adis16201_trigger_bh_to_ring(struct work_struct *work_s)
+{
+ struct adis16201_state *st
+ = container_of(work_s, struct adis16201_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 (adis16201_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 adis16201_unconfigure_ring(struct iio_dev *indio_dev)
+{
+ kfree(indio_dev->pollfunc);
+ iio_sw_rb_free(indio_dev->ring);
+}
+
+int adis16201_configure_ring(struct iio_dev *indio_dev)
+{
+ int ret = 0;
+ struct adis16201_state *st = indio_dev->dev_data;
+ struct iio_ring_buffer *ring;
+ INIT_WORK(&st->work_trigger_to_ring, adis16201_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 = &adis16201_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_temp.number);
+ iio_scan_mask_set(ring, iio_scan_el_in0.number);
+ iio_scan_mask_set(ring, iio_scan_el_incli_x.number);
+ iio_scan_mask_set(ring, iio_scan_el_incli_y.number);
+
+ ret = iio_alloc_pollfunc(indio_dev, NULL, &adis16201_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;
+}
+
+int adis16201_initialize_ring(struct iio_ring_buffer *ring)
+{
+ return iio_ring_buffer_register(ring, 0);
+}
+
+void adis16201_uninitialize_ring(struct iio_ring_buffer *ring)
+{
+ iio_ring_buffer_unregister(ring);
+}
projects / mv-sheeva.git / blobdiff