LXR linux/drivers/staging/iio/accel/adis16209

   1#include <linux/interrupt.h>
   2#include <linux/irq.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>
  12
  13#include "../iio.h"
  14#include "../sysfs.h"
  15#include "../ring_sw.h"
  16#include "accel.h"
  17#include "../trigger.h"
  18#include "adis16209.h"
  19
  20static IIO_SCAN_EL_C(in_supply, ADIS16209_SCAN_SUPPLY,
  21                     ADIS16209_SUPPLY_OUT, NULL);
  22static IIO_CONST_ATTR_SCAN_EL_TYPE(in_supply, u, 14, 16)
  23static IIO_SCAN_EL_C(accel_x, ADIS16209_SCAN_ACC_X, ADIS16209_XACCL_OUT, NULL);
  24static IIO_SCAN_EL_C(accel_y, ADIS16209_SCAN_ACC_Y, ADIS16209_YACCL_OUT, NULL);
  25static IIO_CONST_ATTR_SCAN_EL_TYPE(accel, s, 14, 16);
  26static IIO_SCAN_EL_C(in0, ADIS16209_SCAN_AUX_ADC, ADIS16209_AUX_ADC, NULL);
  27static IIO_CONST_ATTR_SCAN_EL_TYPE(in0, u, 12, 16);
  28static IIO_SCAN_EL_C(temp, ADIS16209_SCAN_TEMP, ADIS16209_TEMP_OUT, NULL);
  29static IIO_CONST_ATTR_SCAN_EL_TYPE(temp, u, 12, 16);
  30static IIO_SCAN_EL_C(incli_x, ADIS16209_SCAN_INCLI_X,
  31                     ADIS16209_XINCL_OUT, NULL);
  32static IIO_SCAN_EL_C(incli_y, ADIS16209_SCAN_INCLI_Y,
  33                     ADIS16209_YINCL_OUT, NULL);
  34static IIO_CONST_ATTR_SCAN_EL_TYPE(incli, s, 14, 16);
  35static IIO_SCAN_EL_C(rot, ADIS16209_SCAN_ROT, ADIS16209_ROT_OUT, NULL);
  36static IIO_CONST_ATTR_SCAN_EL_TYPE(rot, s, 14, 16);
  37static IIO_SCAN_EL_TIMESTAMP(8);
  38static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64);
  39
  40static struct attribute *adis16209_scan_el_attrs[] = {
  41        &iio_scan_el_in_supply.dev_attr.attr,
  42        &iio_const_attr_in_supply_index.dev_attr.attr,
  43        &iio_const_attr_in_supply_type.dev_attr.attr,
  44        &iio_scan_el_accel_x.dev_attr.attr,
  45        &iio_const_attr_accel_x_index.dev_attr.attr,
  46        &iio_scan_el_accel_y.dev_attr.attr,
  47        &iio_const_attr_accel_y_index.dev_attr.attr,
  48        &iio_const_attr_accel_type.dev_attr.attr,
  49        &iio_scan_el_in0.dev_attr.attr,
  50        &iio_const_attr_in0_index.dev_attr.attr,
  51        &iio_const_attr_in0_type.dev_attr.attr,
  52        &iio_scan_el_temp.dev_attr.attr,
  53        &iio_const_attr_temp_index.dev_attr.attr,
  54        &iio_const_attr_temp_type.dev_attr.attr,
  55        &iio_scan_el_incli_x.dev_attr.attr,
  56        &iio_const_attr_incli_x_index.dev_attr.attr,
  57        &iio_scan_el_incli_y.dev_attr.attr,
  58        &iio_const_attr_incli_y_index.dev_attr.attr,
  59        &iio_const_attr_incli_type.dev_attr.attr,
  60        &iio_scan_el_rot.dev_attr.attr,
  61        &iio_const_attr_rot_index.dev_attr.attr,
  62        &iio_const_attr_rot_type.dev_attr.attr,
  63        &iio_scan_el_timestamp.dev_attr.attr,
  64        &iio_const_attr_timestamp_index.dev_attr.attr,
  65        &iio_const_attr_timestamp_type.dev_attr.attr,
  66        NULL,
  67};
  68
  69static struct attribute_group adis16209_scan_el_group = {
  70        .attrs = adis16209_scan_el_attrs,
  71        .name = "scan_elements",
  72};
  73
  74/**
  75 * adis16209_poll_func_th() top half interrupt handler called by trigger
  76 * @private_data:       iio_dev
  77 **/
  78static void adis16209_poll_func_th(struct iio_dev *indio_dev, s64 time)
  79{
  80        struct adis16209_state *st = iio_dev_get_devdata(indio_dev);
  81        st->last_timestamp = time;
  82        schedule_work(&st->work_trigger_to_ring);
  83}
  84
  85/**
  86 * adis16209_read_ring_data() read data registers which will be placed into ring
  87 * @dev: device associated with child of actual device (iio_dev or iio_trig)
  88 * @rx: somewhere to pass back the value read
  89 **/
  90static int adis16209_read_ring_data(struct device *dev, u8 *rx)
  91{
  92        struct spi_message msg;
  93        struct iio_dev *indio_dev = dev_get_drvdata(dev);
  94        struct adis16209_state *st = iio_dev_get_devdata(indio_dev);
  95        struct spi_transfer xfers[ADIS16209_OUTPUTS + 1];
  96        int ret;
  97        int i;
  98
  99        mutex_lock(&st->buf_lock);
 100
 101        spi_message_init(&msg);
 102
 103        memset(xfers, 0, sizeof(xfers));
 104        for (i = 0; i <= ADIS16209_OUTPUTS; i++) {
 105                xfers[i].bits_per_word = 8;
 106                xfers[i].cs_change = 1;
 107                xfers[i].len = 2;
 108                xfers[i].delay_usecs = 30;
 109                xfers[i].tx_buf = st->tx + 2 * i;
 110                st->tx[2 * i]
 111                        = ADIS16209_READ_REG(ADIS16209_SUPPLY_OUT + 2 * i);
 112                st->tx[2 * i + 1] = 0;
 113                if (i >= 1)
 114                        xfers[i].rx_buf = rx + 2 * (i - 1);
 115                spi_message_add_tail(&xfers[i], &msg);
 116        }
 117
 118        ret = spi_sync(st->us, &msg);
 119        if (ret)
 120                dev_err(&st->us->dev, "problem when burst reading");
 121
 122        mutex_unlock(&st->buf_lock);
 123
 124        return ret;
 125}
 126
 127/* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device
 128 * specific to be rolled into the core.
 129 */
 130static void adis16209_trigger_bh_to_ring(struct work_struct *work_s)
 131{
 132        struct adis16209_state *st
 133                = container_of(work_s, struct adis16209_state,
 134                               work_trigger_to_ring);
 135        struct iio_ring_buffer *ring = st->indio_dev->ring;
 136
 137        int i = 0;
 138        s16 *data;
 139        size_t datasize = ring->access.get_bytes_per_datum(ring);
 140
 141        data = kmalloc(datasize , GFP_KERNEL);
 142        if (data == NULL) {
 143                dev_err(&st->us->dev, "memory alloc failed in ring bh");
 144                return;
 145        }
 146
 147        if (ring->scan_count)
 148                if (adis16209_read_ring_data(&st->indio_dev->dev, st->rx) >= 0)
 149                        for (; i < ring->scan_count; i++)
 150                                data[i] = be16_to_cpup(
 151                                        (__be16 *)&(st->rx[i*2]));
 152
 153        /* Guaranteed to be aligned with 8 byte boundary */
 154        if (ring->scan_timestamp)
 155                *((s64 *)(data + ((i + 3)/4)*4)) = st->last_timestamp;
 156
 157        ring->access.store_to(ring,
 158                              (u8 *)data,
 159                              st->last_timestamp);
 160
 161        iio_trigger_notify_done(st->indio_dev->trig);
 162        kfree(data);
 163
 164        return;
 165}
 166
 167void adis16209_unconfigure_ring(struct iio_dev *indio_dev)
 168{
 169        kfree(indio_dev->pollfunc);
 170        iio_sw_rb_free(indio_dev->ring);
 171}
 172
 173int adis16209_configure_ring(struct iio_dev *indio_dev)
 174{
 175        int ret = 0;
 176        struct adis16209_state *st = indio_dev->dev_data;
 177        struct iio_ring_buffer *ring;
 178        INIT_WORK(&st->work_trigger_to_ring, adis16209_trigger_bh_to_ring);
 179
 180        ring = iio_sw_rb_allocate(indio_dev);
 181        if (!ring) {
 182                ret = -ENOMEM;
 183                return ret;
 184        }
 185        indio_dev->ring = ring;
 186        /* Effectively select the ring buffer implementation */
 187        iio_ring_sw_register_funcs(&ring->access);
 188        ring->bpe = 2;
 189        ring->scan_el_attrs = &adis16209_scan_el_group;
 190        ring->scan_timestamp = true;
 191        ring->preenable = &iio_sw_ring_preenable;
 192        ring->postenable = &iio_triggered_ring_postenable;
 193        ring->predisable = &iio_triggered_ring_predisable;
 194        ring->owner = THIS_MODULE;
 195
 196        /* Set default scan mode */
 197        iio_scan_mask_set(ring, iio_scan_el_in_supply.number);
 198        iio_scan_mask_set(ring, iio_scan_el_rot.number);
 199        iio_scan_mask_set(ring, iio_scan_el_accel_x.number);
 200        iio_scan_mask_set(ring, iio_scan_el_accel_y.number);
 201        iio_scan_mask_set(ring, iio_scan_el_temp.number);
 202        iio_scan_mask_set(ring, iio_scan_el_in0.number);
 203        iio_scan_mask_set(ring, iio_scan_el_incli_x.number);
 204        iio_scan_mask_set(ring, iio_scan_el_incli_y.number);
 205
 206        ret = iio_alloc_pollfunc(indio_dev, NULL, &adis16209_poll_func_th);
 207        if (ret)
 208                goto error_iio_sw_rb_free;
 209
 210        indio_dev->modes |= INDIO_RING_TRIGGERED;
 211        return 0;
 212
 213error_iio_sw_rb_free:
 214        iio_sw_rb_free(indio_dev->ring);
 215        return ret;
 216}
 217