int dma_configure_ring_stream(struct iio_dev *indio_dev, const char *dma_name)
{
struct iio_buffer *buffer;
if (dma_name == NULL)
dma_name = "rx";
buffer = iio_dmaengine_buffer_alloc(indio_dev->dev.parent, dma_name,
&dma_buffer_ops, indio_dev);
if (IS_ERR(buffer))
return PTR_ERR(buffer);
indio_dev->modes |= INDIO_BUFFER_HARDWARE;
iio_device_attach_buffer(indio_dev, buffer);
return 0;
}
static int ssp_accel_probe(struct platform_device *pdev)
{
int ret;
struct iio_dev *indio_dev;
struct ssp_sensor_data *spd;
struct iio_buffer *buffer;
indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*spd));
if (!indio_dev)
return -ENOMEM;
spd = iio_priv(indio_dev);
spd->process_data = ssp_process_accel_data;
spd->type = SSP_ACCELEROMETER_SENSOR;
indio_dev->name = ssp_accel_device_name;
indio_dev->dev.parent = &pdev->dev;
indio_dev->dev.of_node = pdev->dev.of_node;
indio_dev->info = &ssp_accel_iio_info;
indio_dev->modes = INDIO_BUFFER_SOFTWARE;
indio_dev->channels = ssp_acc_channels;
indio_dev->num_channels = ARRAY_SIZE(ssp_acc_channels);
indio_dev->available_scan_masks = ssp_accel_scan_mask;
buffer = devm_iio_kfifo_allocate(&pdev->dev);
if (!buffer)
return -ENOMEM;
iio_device_attach_buffer(indio_dev, buffer);
indio_dev->setup_ops = &ssp_accel_buffer_ops;
platform_set_drvdata(pdev, indio_dev);
ret = iio_device_register(indio_dev);
if (ret < 0)
return ret;
/* ssp registering should be done after all iio setup */
ssp_register_consumer(indio_dev, SSP_ACCELEROMETER_SENSOR);
return 0;
}
/**
* iio_triggered_buffer_setup() - Setup triggered buffer and pollfunc
* @indio_dev: IIO device structure
* @pollfunc_bh: Function which will be used as pollfunc bottom half
* @pollfunc_th: Function which will be used as pollfunc top half
* @setup_ops: Buffer setup functions to use for this device.
* If NULL the default setup functions for triggered
* buffers will be used.
*
* This function combines some common tasks which will normally be performed
* when setting up a triggered buffer. It will allocate the buffer and the
* pollfunc.
*
* Before calling this function the indio_dev structure should already be
* completely initialized, but not yet registered. In practice this means that
* this function should be called right before iio_device_register().
*
* To free the resources allocated by this function call
* iio_triggered_buffer_cleanup().
*/
int iio_triggered_buffer_setup(struct iio_dev *indio_dev,
irqreturn_t (*pollfunc_bh)(int irq, void *p),
irqreturn_t (*pollfunc_th)(int irq, void *p),
const struct iio_buffer_setup_ops *setup_ops)
{
struct iio_buffer *buffer;
int ret;
buffer = iio_kfifo_allocate();
if (!buffer) {
ret = -ENOMEM;
goto error_ret;
}
iio_device_attach_buffer(indio_dev, buffer);
indio_dev->pollfunc = iio_alloc_pollfunc(pollfunc_bh,
pollfunc_th,
IRQF_ONESHOT,
indio_dev,
"%s_consumer%d",
indio_dev->name,
indio_dev->id);
if (indio_dev->pollfunc == NULL) {
ret = -ENOMEM;
goto error_kfifo_free;
}
/* Ring buffer functions - here trigger setup related */
indio_dev->setup_ops = setup_ops;
/* Flag that polled ring buffering is possible */
indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
return 0;
error_kfifo_free:
iio_kfifo_free(indio_dev->buffer);
error_ret:
return ret;
}
int ade7758_configure_ring(struct iio_dev *indio_dev)
{
struct ade7758_state *st = iio_priv(indio_dev);
struct iio_buffer *buffer;
int ret = 0;
buffer = iio_kfifo_allocate();
if (!buffer)
return -ENOMEM;
iio_device_attach_buffer(indio_dev, buffer);
indio_dev->setup_ops = &ade7758_ring_setup_ops;
indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time,
&ade7758_trigger_handler,
0,
indio_dev,
"ade7759_consumer%d",
indio_dev->id);
if (!indio_dev->pollfunc) {
ret = -ENOMEM;
goto error_iio_kfifo_free;
}
indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
st->tx_buf[0] = ADE7758_READ_REG(ADE7758_RSTATUS);
st->tx_buf[1] = 0;
st->tx_buf[2] = 0;
st->tx_buf[3] = 0;
st->tx_buf[4] = ADE7758_READ_REG(ADE7758_WFORM);
st->tx_buf[5] = 0;
st->tx_buf[6] = 0;
st->tx_buf[7] = 0;
/* build spi ring message */
st->ring_xfer[0].tx_buf = &st->tx_buf[0];
st->ring_xfer[0].len = 1;
st->ring_xfer[0].bits_per_word = 8;
st->ring_xfer[0].delay_usecs = 4;
st->ring_xfer[1].rx_buf = &st->rx_buf[1];
st->ring_xfer[1].len = 3;
st->ring_xfer[1].bits_per_word = 8;
st->ring_xfer[1].cs_change = 1;
st->ring_xfer[2].tx_buf = &st->tx_buf[4];
st->ring_xfer[2].len = 1;
st->ring_xfer[2].bits_per_word = 8;
st->ring_xfer[2].delay_usecs = 1;
st->ring_xfer[3].rx_buf = &st->rx_buf[5];
st->ring_xfer[3].len = 3;
st->ring_xfer[3].bits_per_word = 8;
spi_message_init(&st->ring_msg);
spi_message_add_tail(&st->ring_xfer[0], &st->ring_msg);
spi_message_add_tail(&st->ring_xfer[1], &st->ring_msg);
spi_message_add_tail(&st->ring_xfer[2], &st->ring_msg);
spi_message_add_tail(&st->ring_xfer[3], &st->ring_msg);
return 0;
error_iio_kfifo_free:
iio_kfifo_free(indio_dev->buffer);
return ret;
}
int iio_simple_dummy_configure_buffer(struct iio_dev *indio_dev,
const struct iio_chan_spec *channels, unsigned int num_channels)
{
int ret;
struct iio_buffer *buffer;
/* Allocate a buffer to use - here a kfifo */
buffer = iio_kfifo_allocate(indio_dev);
if (buffer == NULL) {
ret = -ENOMEM;
goto error_ret;
}
iio_device_attach_buffer(indio_dev, buffer);
/* Enable timestamps by default */
buffer->scan_timestamp = true;
/*
* Tell the core what device type specific functions should
* be run on either side of buffer capture enable / disable.
*/
indio_dev->setup_ops = &iio_simple_dummy_buffer_setup_ops;
/*
* Configure a polling function.
* When a trigger event with this polling function connected
* occurs, this function is run. Typically this grabs data
* from the device.
*
* NULL for the bottom half. This is normally implemented only if we
* either want to ping a capture now pin (no sleeping) or grab
* a timestamp as close as possible to a data ready trigger firing.
*
* IRQF_ONESHOT ensures irqs are masked such that only one instance
* of the handler can run at a time.
*
* "iio_simple_dummy_consumer%d" formatting string for the irq 'name'
* as seen under /proc/interrupts. Remaining parameters as per printk.
*/
indio_dev->pollfunc = iio_alloc_pollfunc(NULL,
&iio_simple_dummy_trigger_h,
IRQF_ONESHOT,
indio_dev,
"iio_simple_dummy_consumer%d",
indio_dev->id);
if (indio_dev->pollfunc == NULL) {
ret = -ENOMEM;
goto error_free_buffer;
}
/*
* Notify the core that this device is capable of buffered capture
* driven by a trigger.
*/
indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
ret = iio_buffer_register(indio_dev, channels, num_channels);
if (ret)
goto error_dealloc_pollfunc;
return 0;
error_dealloc_pollfunc:
iio_dealloc_pollfunc(indio_dev->pollfunc);
error_free_buffer:
iio_kfifo_free(indio_dev->buffer);
error_ret:
return ret;
}
