| #include <linux/export.h> |
| #include <linux/interrupt.h> |
| #include <linux/mutex.h> |
| #include <linux/kernel.h> |
| #include <linux/spi/spi.h> |
| #include <linux/slab.h> |
| |
| #include "../iio.h" |
| #include "../ring_sw.h" |
| #include "../trigger_consumer.h" |
| #include "adis16201.h" |
| |
| |
| /** |
| * 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 iio_dev *indio_dev, u8 *rx) |
| { |
| struct spi_message msg; |
| struct adis16201_state *st = iio_priv(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; |
| if (i < ADIS16201_OUTPUTS) { |
| 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 irqreturn_t adis16201_trigger_handler(int irq, void *p) |
| { |
| struct iio_poll_func *pf = p; |
| struct iio_dev *indio_dev = pf->indio_dev; |
| struct adis16201_state *st = iio_priv(indio_dev); |
| struct iio_buffer *ring = indio_dev->buffer; |
| |
| 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 -ENOMEM; |
| } |
| |
| if (!bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength) |
| && adis16201_read_ring_data(indio_dev, st->rx) >= 0) |
| for (; i < bitmap_weight(indio_dev->active_scan_mask, |
| indio_dev->masklength); 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)) = pf->timestamp; |
| |
| ring->access->store_to(ring, (u8 *)data, pf->timestamp); |
| |
| iio_trigger_notify_done(indio_dev->trig); |
| kfree(data); |
| |
| return IRQ_HANDLED; |
| } |
| |
| void adis16201_unconfigure_ring(struct iio_dev *indio_dev) |
| { |
| iio_dealloc_pollfunc(indio_dev->pollfunc); |
| iio_sw_rb_free(indio_dev->buffer); |
| } |
| |
| static const struct iio_buffer_setup_ops adis16201_ring_setup_ops = { |
| .preenable = &iio_sw_buffer_preenable, |
| .postenable = &iio_triggered_buffer_postenable, |
| .predisable = &iio_triggered_buffer_predisable, |
| }; |
| |
| int adis16201_configure_ring(struct iio_dev *indio_dev) |
| { |
| int ret = 0; |
| struct iio_buffer *ring; |
| |
| ring = iio_sw_rb_allocate(indio_dev); |
| if (!ring) { |
| ret = -ENOMEM; |
| return ret; |
| } |
| indio_dev->buffer = ring; |
| ring->scan_timestamp = true; |
| indio_dev->setup_ops = &adis16201_ring_setup_ops; |
| |
| indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time, |
| &adis16201_trigger_handler, |
| IRQF_ONESHOT, |
| indio_dev, |
| "adis16201_consumer%d", |
| indio_dev->id); |
| if (indio_dev->pollfunc == NULL) { |
| ret = -ENOMEM; |
| goto error_iio_sw_rb_free; |
| } |
| |
| indio_dev->modes |= INDIO_BUFFER_TRIGGERED; |
| return 0; |
| error_iio_sw_rb_free: |
| iio_sw_rb_free(indio_dev->buffer); |
| return ret; |
| } |