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authorAlexandru Ardelean <alexandru.ardelean@analog.com>2019-03-22 22:44:39 +0200
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2019-04-04 20:20:24 +0100
commit5075e0720d93a84e059759c5d8c6a78613d0face (patch)
treeecdea898d086f2bcf97cab74966cb5cb6b26c6c5 /include
parent74878d4fa816443716bd8adf4f9f6986f5c6f256 (diff)
iio: imu: adis: generalize burst mode support
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/iio/imu/adis.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h
index 360da7d18a3d..469a493f7ae0 100644
--- a/include/linux/iio/imu/adis.h
+++ b/include/linux/iio/imu/adis.h
@@ -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,