From bf96f6e80cef4b9a234e8ce81aa2e333ca7ce599 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Thu, 1 Sep 2016 11:44:38 +0200 Subject: iio: accel: kxsd9: Split out SPI transport This moves the KXSD9 SPI transport out to its own file and Kconfig entry, so that we will be able to add another transport method. We export the common probe and add a local header file for the functionality shared between the main driver and the transport driver. We make the SPI transport the default for the driver if SPI is available and the KXSD9 driver was selected, so the oldconfig upgrade path will be clear. Signed-off-by: Linus Walleij Tested-by: Jonathan Cameron Signed-off-by: Jonathan Cameron --- drivers/iio/accel/kxsd9.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 drivers/iio/accel/kxsd9.h (limited to 'drivers/iio/accel/kxsd9.h') diff --git a/drivers/iio/accel/kxsd9.h b/drivers/iio/accel/kxsd9.h new file mode 100644 index 000000000000..28845c3440e9 --- /dev/null +++ b/drivers/iio/accel/kxsd9.h @@ -0,0 +1,32 @@ +#include +#include + +#define KXSD9_STATE_RX_SIZE 2 +#define KXSD9_STATE_TX_SIZE 2 + +struct kxsd9_transport; + +/** + * struct kxsd9_transport - transport adapter for SPI or I2C + * @trdev: transport device such as SPI or I2C + * @readreg(): function to read a byte from an address in the device + * @writereg(): function to write a byte to an address in the device + * @write2(): function to write two consecutive bytes to the device + * @readval(): function to read a 16bit value from the device + * @rx: cache aligned read buffer + * @tx: cache aligned write buffer + */ +struct kxsd9_transport { + void *trdev; + int (*readreg) (struct kxsd9_transport *tr, u8 address); + int (*writereg) (struct kxsd9_transport *tr, u8 address, u8 val); + int (*write2) (struct kxsd9_transport *tr, u8 b1, u8 b2); + int (*readval) (struct kxsd9_transport *tr, u8 address); + u8 rx[KXSD9_STATE_RX_SIZE] ____cacheline_aligned; + u8 tx[KXSD9_STATE_TX_SIZE]; +}; + +int kxsd9_common_probe(struct device *parent, + struct kxsd9_transport *transport, + const char *name); +int kxsd9_common_remove(struct device *parent); -- cgit v1.2.3