2010-05-07 16:39:00 +02:00
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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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2010-05-23 09:10:35 +02:00
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#include <linux/slab.h>
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2010-05-07 16:39:00 +02:00
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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 "adis16240.h"
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/**
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* combine_8_to_16() utility function to munge to u8s into u16
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**/
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static inline u16 combine_8_to_16(u8 lower, u8 upper)
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{
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u16 _lower = lower;
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u16 _upper = upper;
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return _lower | (_upper << 8);
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}
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static IIO_SCAN_EL_C(supply, ADIS16240_SCAN_SUPPLY, IIO_UNSIGNED(10),
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ADIS16240_SUPPLY_OUT, NULL);
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static IIO_SCAN_EL_C(accel_x, ADIS16240_SCAN_ACC_X, IIO_SIGNED(10),
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ADIS16240_XACCL_OUT, NULL);
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static IIO_SCAN_EL_C(accel_y, ADIS16240_SCAN_ACC_Y, IIO_SIGNED(10),
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ADIS16240_YACCL_OUT, NULL);
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static IIO_SCAN_EL_C(accel_z, ADIS16240_SCAN_ACC_Z, IIO_SIGNED(10),
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ADIS16240_ZACCL_OUT, NULL);
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static IIO_SCAN_EL_C(aux_adc, ADIS16240_SCAN_AUX_ADC, IIO_UNSIGNED(10),
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ADIS16240_AUX_ADC, NULL);
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static IIO_SCAN_EL_C(temp, ADIS16240_SCAN_TEMP, IIO_UNSIGNED(10),
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ADIS16240_TEMP_OUT, NULL);
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static IIO_SCAN_EL_TIMESTAMP(6);
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static struct attribute *adis16240_scan_el_attrs[] = {
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&iio_scan_el_supply.dev_attr.attr,
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&iio_scan_el_accel_x.dev_attr.attr,
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&iio_scan_el_accel_y.dev_attr.attr,
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&iio_scan_el_accel_z.dev_attr.attr,
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&iio_scan_el_aux_adc.dev_attr.attr,
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&iio_scan_el_temp.dev_attr.attr,
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&iio_scan_el_timestamp.dev_attr.attr,
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NULL,
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};
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static struct attribute_group adis16240_scan_el_group = {
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.attrs = adis16240_scan_el_attrs,
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.name = "scan_elements",
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};
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/**
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* adis16240_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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2010-07-11 17:39:11 +02:00
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static void adis16240_poll_func_th(struct iio_dev *indio_dev, s64 time)
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2010-05-07 16:39:00 +02:00
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{
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struct adis16240_state *st = iio_dev_get_devdata(indio_dev);
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2010-07-11 17:39:11 +02:00
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st->last_timestamp = time;
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2010-05-07 16:39:00 +02:00
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schedule_work(&st->work_trigger_to_ring);
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}
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/**
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* adis16240_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 adis16240_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 adis16240_state *st = iio_dev_get_devdata(indio_dev);
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struct spi_transfer xfers[ADIS16240_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 <= ADIS16240_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 = 30;
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xfers[i].tx_buf = st->tx + 2 * i;
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st->tx[2 * i]
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= ADIS16240_READ_REG(ADIS16240_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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static void adis16240_trigger_bh_to_ring(struct work_struct *work_s)
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{
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struct adis16240_state *st
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= container_of(work_s, struct adis16240_state,
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work_trigger_to_ring);
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int i = 0;
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s16 *data;
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size_t datasize = st->indio_dev
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->ring->access.get_bpd(st->indio_dev->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 (st->indio_dev->scan_count)
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if (adis16240_read_ring_data(&st->indio_dev->dev, st->rx) >= 0)
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for (; i < st->indio_dev->scan_count; i++) {
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data[i] = combine_8_to_16(st->rx[i*2+1],
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st->rx[i*2]);
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}
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/* Guaranteed to be aligned with 8 byte boundary */
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if (st->indio_dev->scan_timestamp)
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*((s64 *)(data + ((i + 3)/4)*4)) = st->last_timestamp;
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st->indio_dev->ring->access.store_to(st->indio_dev->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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static int adis16240_data_rdy_ring_preenable(struct iio_dev *indio_dev)
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{
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size_t size;
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dev_dbg(&indio_dev->dev, "%s\n", __func__);
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/* Check if there are any scan elements enabled, if not fail*/
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if (!(indio_dev->scan_count || indio_dev->scan_timestamp))
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return -EINVAL;
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if (indio_dev->ring->access.set_bpd) {
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if (indio_dev->scan_timestamp)
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if (indio_dev->scan_count)
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/* Timestamp (aligned sizeof(s64) and data */
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size = (((indio_dev->scan_count * sizeof(s16))
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+ sizeof(s64) - 1)
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& ~(sizeof(s64) - 1))
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+ sizeof(s64);
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else /* Timestamp only */
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size = sizeof(s64);
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else /* Data only */
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size = indio_dev->scan_count*sizeof(s16);
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indio_dev->ring->access.set_bpd(indio_dev->ring, size);
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}
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return 0;
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}
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void adis16240_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 adis16240_configure_ring(struct iio_dev *indio_dev)
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{
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int ret = 0;
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struct adis16240_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, adis16240_trigger_bh_to_ring);
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/* Set default scan mode */
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iio_scan_mask_set(indio_dev, iio_scan_el_supply.number);
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iio_scan_mask_set(indio_dev, iio_scan_el_accel_x.number);
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iio_scan_mask_set(indio_dev, iio_scan_el_accel_y.number);
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iio_scan_mask_set(indio_dev, iio_scan_el_accel_z.number);
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iio_scan_mask_set(indio_dev, iio_scan_el_temp.number);
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iio_scan_mask_set(indio_dev, iio_scan_el_aux_adc.number);
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indio_dev->scan_timestamp = true;
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indio_dev->scan_el_attrs = &adis16240_scan_el_group;
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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->preenable = &adis16240_data_rdy_ring_preenable;
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2010-07-11 17:39:10 +02:00
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ring->postenable = &iio_triggered_ring_postenable;
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ring->predisable = &iio_triggered_ring_predisable;
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2010-05-07 16:39:00 +02:00
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ring->owner = THIS_MODULE;
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2010-07-11 17:39:09 +02:00
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ret = iio_alloc_pollfunc(indio_dev, NULL, &adis16240_poll_func_th);
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if (ret)
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goto error_iio_sw_rb_free;
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2010-05-07 16:39:00 +02:00
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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 adis16240_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 adis16240_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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