LXR linux/drivers/staging/iio/accel/adis16201

   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 "adis16201.h"
  19
  20static IIO_SCAN_EL_C(in_supply, ADIS16201_SCAN_SUPPLY, ADIS16201_SUPPLY_OUT, NULL);
  21static IIO_CONST_ATTR_SCAN_EL_TYPE(in_supply, u, 12, 16);
  22static IIO_SCAN_EL_C(accel_x, ADIS16201_SCAN_ACC_X, ADIS16201_XACCL_OUT, NULL);
  23static IIO_SCAN_EL_C(accel_y, ADIS16201_SCAN_ACC_Y, ADIS16201_YACCL_OUT, NULL);
  24static IIO_CONST_ATTR_SCAN_EL_TYPE(accel, s, 14, 16);
  25static IIO_SCAN_EL_C(in0, ADIS16201_SCAN_AUX_ADC, ADIS16201_AUX_ADC, NULL);
  26static IIO_CONST_ATTR_SCAN_EL_TYPE(in0, u, 12, 16);
  27static IIO_SCAN_EL_C(temp, ADIS16201_SCAN_TEMP, ADIS16201_TEMP_OUT, NULL);
  28static IIO_CONST_ATTR_SCAN_EL_TYPE(temp, u, 12, 16);
  29static IIO_SCAN_EL_C(incli_x, ADIS16201_SCAN_INCLI_X,
  30                     ADIS16201_XINCL_OUT, NULL);
  31static IIO_SCAN_EL_C(incli_y, ADIS16201_SCAN_INCLI_Y,
  32                     ADIS16201_YINCL_OUT, NULL);
  33static IIO_CONST_ATTR_SCAN_EL_TYPE(incli, s, 14, 16);
  34static IIO_SCAN_EL_TIMESTAMP(7);
  35static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64);
  36
  37static struct attribute *adis16201_scan_el_attrs[] = {
  38        &iio_scan_el_in_supply.dev_attr.attr,
  39        &iio_const_attr_in_supply_index.dev_attr.attr,
  40        &iio_const_attr_in_supply_type.dev_attr.attr,
  41        &iio_scan_el_accel_x.dev_attr.attr,
  42        &iio_const_attr_accel_x_index.dev_attr.attr,
  43        &iio_scan_el_accel_y.dev_attr.attr,
  44        &iio_const_attr_accel_y_index.dev_attr.attr,
  45        &iio_const_attr_accel_type.dev_attr.attr,
  46        &iio_scan_el_in0.dev_attr.attr,
  47        &iio_const_attr_in0_index.dev_attr.attr,
  48        &iio_const_attr_in0_type.dev_attr.attr,
  49        &iio_scan_el_temp.dev_attr.attr,
  50        &iio_const_attr_temp_index.dev_attr.attr,
  51        &iio_const_attr_temp_type.dev_attr.attr,
  52        &iio_scan_el_incli_x.dev_attr.attr,
  53        &iio_const_attr_incli_x_index.dev_attr.attr,
  54        &iio_scan_el_incli_y.dev_attr.attr,
  55        &iio_const_attr_incli_y_index.dev_attr.attr,
  56        &iio_const_attr_incli_type.dev_attr.attr,
  57        &iio_scan_el_timestamp.dev_attr.attr,
  58        &iio_const_attr_timestamp_index.dev_attr.attr,
  59        &iio_const_attr_timestamp_type.dev_attr.attr,
  60        NULL,
  61};
  62
  63static struct attribute_group adis16201_scan_el_group = {
  64        .attrs = adis16201_scan_el_attrs,
  65        .name = "scan_elements",
  66};
  67
  68/**
  69 * adis16201_poll_func_th() top half interrupt handler called by trigger
  70 * @private_data:       iio_dev
  71 **/
  72static void adis16201_poll_func_th(struct iio_dev *indio_dev, s64 time)
  73{
  74        struct adis16201_state *st = iio_dev_get_devdata(indio_dev);
  75        st->last_timestamp = time;
  76        schedule_work(&st->work_trigger_to_ring);
  77}
  78
  79/**
  80 * adis16201_read_ring_data() read data registers which will be placed into ring
  81 * @dev: device associated with child of actual device (iio_dev or iio_trig)
  82 * @rx: somewhere to pass back the value read
  83 **/
  84static int adis16201_read_ring_data(struct device *dev, u8 *rx)
  85{
  86        struct spi_message msg;
  87        struct iio_dev *indio_dev = dev_get_drvdata(dev);
  88        struct adis16201_state *st = iio_dev_get_devdata(indio_dev);
  89        struct spi_transfer xfers[ADIS16201_OUTPUTS + 1];
  90        int ret;
  91        int i;
  92
  93        mutex_lock(&st->buf_lock);
  94
  95        spi_message_init(&msg);
  96
  97        memset(xfers, 0, sizeof(xfers));
  98        for (i = 0; i <= ADIS16201_OUTPUTS; i++) {
  99                xfers[i].bits_per_word = 8;
 100                xfers[i].cs_change = 1;
 101                xfers[i].len = 2;
 102                xfers[i].delay_usecs = 20;
 103                xfers[i].tx_buf = st->tx + 2 * i;
 104                st->tx[2 * i] = ADIS16201_READ_REG(ADIS16201_SUPPLY_OUT + 2 * i);
 105                st->tx[2 * i + 1] = 0;
 106                if (i >= 1)
 107                        xfers[i].rx_buf = rx + 2 * (i - 1);
 108                spi_message_add_tail(&xfers[i], &msg);
 109        }
 110
 111        ret = spi_sync(st->us, &msg);
 112        if (ret)
 113                dev_err(&st->us->dev, "problem when burst reading");
 114
 115        mutex_unlock(&st->buf_lock);
 116
 117        return ret;
 118}
 119
 120/* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device
 121 * specific to be rolled into the core.
 122 */
 123static void adis16201_trigger_bh_to_ring(struct work_struct *work_s)
 124{
 125        struct adis16201_state *st
 126                = container_of(work_s, struct adis16201_state,
 127                               work_trigger_to_ring);
 128        struct iio_ring_buffer *ring = st->indio_dev->ring;
 129
 130        int i = 0;
 131        s16 *data;
 132        size_t datasize = ring->access.get_bytes_per_datum(ring);
 133
 134        data = kmalloc(datasize, GFP_KERNEL);
 135        if (data == NULL) {
 136                dev_err(&st->us->dev, "memory alloc failed in ring bh");
 137                return;
 138        }
 139
 140        if (ring->scan_count)
 141                if (adis16201_read_ring_data(&st->indio_dev->dev, st->rx) >= 0)
 142                        for (; i < ring->scan_count; i++)
 143                                data[i] = be16_to_cpup(
 144                                        (__be16 *)&(st->rx[i*2]));
 145
 146        /* Guaranteed to be aligned with 8 byte boundary */
 147        if (ring->scan_timestamp)
 148                *((s64 *)(data + ((i + 3)/4)*4)) = st->last_timestamp;
 149
 150        ring->access.store_to(ring,
 151                              (u8 *)data,
 152                              st->last_timestamp);
 153
 154        iio_trigger_notify_done(st->indio_dev->trig);
 155        kfree(data);
 156
 157        return;
 158}
 159
 160void adis16201_unconfigure_ring(struct iio_dev *indio_dev)
 161{
 162        kfree(indio_dev->pollfunc);
 163        iio_sw_rb_free(indio_dev->ring);
 164}
 165
 166int adis16201_configure_ring(struct iio_dev *indio_dev)
 167{
 168        int ret = 0;
 169        struct adis16201_state *st = indio_dev->dev_data;
 170        struct iio_ring_buffer *ring;
 171        INIT_WORK(&st->work_trigger_to_ring, adis16201_trigger_bh_to_ring);
 172
 173        ring = iio_sw_rb_allocate(indio_dev);
 174        if (!ring) {
 175                ret = -ENOMEM;
 176                return ret;
 177        }
 178        indio_dev->ring = ring;
 179        /* Effectively select the ring buffer implementation */
 180        iio_ring_sw_register_funcs(&ring->access);
 181        ring->bpe = 2;
 182        ring->scan_el_attrs = &adis16201_scan_el_group;
 183        ring->scan_timestamp = true;
 184        ring->preenable = &iio_sw_ring_preenable;
 185        ring->postenable = &iio_triggered_ring_postenable;
 186        ring->predisable = &iio_triggered_ring_predisable;
 187        ring->owner = THIS_MODULE;
 188
 189        /* Set default scan mode */
 190        iio_scan_mask_set(ring, iio_scan_el_in_supply.number);
 191        iio_scan_mask_set(ring, iio_scan_el_accel_x.number);
 192        iio_scan_mask_set(ring, iio_scan_el_accel_y.number);
 193        iio_scan_mask_set(ring, iio_scan_el_temp.number);
 194        iio_scan_mask_set(ring, iio_scan_el_in0.number);
 195        iio_scan_mask_set(ring, iio_scan_el_incli_x.number);
 196        iio_scan_mask_set(ring, iio_scan_el_incli_y.number);
 197
 198        ret = iio_alloc_pollfunc(indio_dev, NULL, &adis16201_poll_func_th);
 199        if (ret)
 200                goto error_iio_sw_rb_free;
 201
 202        indio_dev->modes |= INDIO_RING_TRIGGERED;
 203        return 0;
 204
 205error_iio_sw_rb_free:
 206        iio_sw_rb_free(indio_dev->ring);
 207        return ret;
 208}
 209
 210int adis16201_initialize_ring(struct iio_ring_buffer *ring)
 211{
 212        return iio_ring_buffer_register(ring, 0);
 213}
 214
 215void adis16201_uninitialize_ring(struct iio_ring_buffer *ring)
 216{
 217        iio_ring_buffer_unregister(ring);
 218}
 219