static int yas_probe_buffer(struct iio_dev *indio_dev)
{
int ret;
struct iio_buffer *buffer;
buffer = iio_sw_rb_allocate(indio_dev);
if (!buffer) {
ret = -ENOMEM;
goto error_ret;
}
buffer->scan_timestamp = true;
indio_dev->buffer = buffer;
indio_dev->setup_ops = &yas_buffer_setup_ops;
indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
ret = iio_buffer_register(indio_dev, indio_dev->channels,
indio_dev->num_channels);
if (ret)
goto error_free_buf;
iio_scan_mask_set(indio_dev, indio_dev->buffer, YAS_SCAN_ACCEL_X);
iio_scan_mask_set(indio_dev, indio_dev->buffer, YAS_SCAN_ACCEL_Y);
iio_scan_mask_set(indio_dev, indio_dev->buffer, YAS_SCAN_ACCEL_Z);
return 0;
error_free_buf:
iio_sw_rb_free(indio_dev->buffer);
error_ret:
return ret;
}
/**
* 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, as well as register the buffer with the IIO core.
*
* 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)
{
int ret;
indio_dev->buffer = iio_kfifo_allocate(indio_dev);
if (!indio_dev->buffer) {
ret = -ENOMEM;
goto error_ret;
}
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 */
if (setup_ops)
indio_dev->setup_ops = setup_ops;
else
indio_dev->setup_ops = &iio_triggered_buffer_setup_ops;
/* Flag that polled ring buffering is possible */
indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
ret = iio_buffer_register(indio_dev,
indio_dev->channels,
indio_dev->num_channels);
if (ret)
goto error_dealloc_pollfunc;
return 0;
error_dealloc_pollfunc:
iio_dealloc_pollfunc(indio_dev->pollfunc);
error_kfifo_free:
iio_kfifo_free(indio_dev->buffer);
error_ret:
return ret;
}
static int m4pas_create_iiodev(struct iio_dev *iio)
{
int err = 0;
struct m4pas_driver_data *dd = iio_priv(iio);
iio->name = M4PAS_DRIVER_NAME;
iio->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_HARDWARE;
iio->num_channels = 1;
iio->info = &m4pas_iio_info;
iio->channels = m4pas_iio_channels;
iio->buffer = iio_kfifo_allocate(iio);
if (iio->buffer == NULL) {
m4pas_err("%s: Failed to allocate IIO buffer.\n", __func__);
err = -ENOMEM;
goto m4pas_create_iiodev_kfifo_fail;
}
iio->buffer->scan_timestamp = true;
iio->buffer->access->set_bytes_per_datum(iio->buffer,
sizeof(dd->iiodat));
err = iio_buffer_register(iio, iio->channels, iio->num_channels);
if (err < 0) {
m4pas_err("%s: Failed to register IIO buffer.\n", __func__);
goto m4pas_create_iiodev_buffer_fail;
}
err = iio_device_register(iio);
if (err < 0) {
m4pas_err("%s: Failed to register IIO device.\n", __func__);
goto m4pas_create_iiodev_iioreg_fail;
}
goto m4pas_create_iiodev_exit;
m4pas_create_iiodev_iioreg_fail:
iio_buffer_unregister(iio);
m4pas_create_iiodev_buffer_fail:
iio_kfifo_free(iio->buffer);
m4pas_create_iiodev_kfifo_fail:
iio_device_free(iio); /* dd is freed here */
m4pas_create_iiodev_exit:
return err;
}
/**
* inv_ak89xx_probe() - probe function.
*/
static int inv_ak89xx_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct inv_ak89xx_state_s *st;
struct iio_dev *indio_dev;
int result;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
result = -ENODEV;
goto out_no_free;
}
indio_dev = iio_allocate_device(sizeof(*st));
if (indio_dev == NULL) {
result = -ENOMEM;
goto out_no_free;
}
st = iio_priv(indio_dev);
st->i2c = client;
st->sl_handle = client->adapter;
st->plat_data =
*(struct mpu_platform_data *)dev_get_platdata(&client->dev);
st->i2c_addr = client->addr;
st->delay = AK89XX_DEFAULT_DELAY;
st->compass_id = id->driver_data;
st->compass_scale = 0;
i2c_set_clientdata(client, indio_dev);
result = ak89xx_init(st);
if (result)
goto out_free;
indio_dev->dev.parent = &client->dev;
indio_dev->name = id->name;
indio_dev->channels = compass_channels;
indio_dev->num_channels = ARRAY_SIZE(compass_channels);
indio_dev->info = &ak89xx_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->currentmode = INDIO_DIRECT_MODE;
result = inv_ak89xx_configure_ring(indio_dev);
if (result)
goto out_free;
result = iio_buffer_register(indio_dev, indio_dev->channels,
indio_dev->num_channels);
if (result)
goto out_unreg_ring;
result = inv_ak89xx_probe_trigger(indio_dev);
if (result)
goto out_remove_ring;
result = iio_device_register(indio_dev);
if (result)
goto out_remove_trigger;
INIT_DELAYED_WORK(&st->work, ak89xx_work_func);
pr_info("%s: Probe name %s\n", __func__, id->name);
return 0;
out_remove_trigger:
if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
inv_ak89xx_remove_trigger(indio_dev);
out_remove_ring:
iio_buffer_unregister(indio_dev);
out_unreg_ring:
inv_ak89xx_unconfigure_ring(indio_dev);
out_free:
iio_free_device(indio_dev);
out_no_free:
dev_err(&client->adapter->dev, "%s failed %d\n", __func__, result);
return -EIO;
}
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;
}
