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iio: imu: adis: generalize burst mode support

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Some variants in the ADIS16400 family support burst mode. This mechanism is
implemented in the `adis16400_buffer.c` file.

Some variants in ADIS16480 are also adding burst mode, which is
functionally similar to ADIS16400, but with different parameters. To get
there, a `adis_burst` struct is added to parametrize certain bits of the
SPI communication to setup: the register that triggers burst-mode, and the
extra-data-length that needs be accounted for when building the bust-length
buffer.

The trigger handler cannot be made generic, since it's very specific to
each ADIS164XX family.

A future enhancement of this `adis_burst` mode will be the possibility to
enable/disable burst-mode. For the ADIS16400 family it's hard-coded to on
by default. But for ADIS16480 there will be a need to disable this.

When that will be implemented, both ADIS16400 & ADIS16480 will have the
burst-mode enable-able/disable-able.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Alexandru Ardelean
2019-03-22 22:44:39 +02:00
committed by Jonathan Cameron
parent 74878d4fa8
commit 5075e0720d
3 changed files with 25 additions and 4 deletions
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14
include/linux/iio/imu/adis.h
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@@ -21,6 +21,7 @@
#define ADIS_REG_PAGE_ID 0x00
struct adis;
struct adis_burst;
/**
* struct adis_data - ADIS chip variant specific data
@@ -57,6 +58,7 @@ struct adis {
struct iio_trigger *trig;
const struct adis_data *data;
struct adis_burst *burst;
struct mutex txrx_lock;
struct spi_message msg;
@@ -232,6 +234,18 @@ int adis_single_conversion(struct iio_dev *indio_dev,
#ifdef CONFIG_IIO_ADIS_LIB_BUFFER
/**
* struct adis_burst - ADIS data for burst transfers
* @en burst mode enabled
* @reg_cmd register command that triggers burst
* @extra_len extra length to account in the SPI RX buffer
*/
struct adis_burst {
bool en;
unsigned int reg_cmd;
unsigned int extra_len;
};
int adis_setup_buffer_and_trigger(struct adis *adis,
struct iio_dev *indio_dev, irqreturn_t (*trigger_handler)(int, void *));
void adis_cleanup_buffer_and_trigger(struct adis *adis,