release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/staging/iio/accel/adis16209_ring.c

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