From 484a0bf091c93c379e6524a17bb037c33c898e01 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Tue, 20 Nov 2012 13:36:00 +0000 Subject: iio:imu:adis: Add paging support Some of the newer generation devices from the ADIS16XXX series have more registers than what can be supported with the current register addressing scheme. These devices implement register paging to support a larger register range. Each page is 128 registers large and the currently active page can be selected via register 0x00 in each page. This patch implements transparent paging inside the common adis library. The register read/write interface stays the same and when a register is accessed the library automatically switches to the correct page if it is not already selected. The page number is encoded in the upper bits of the register number, e.g. register 0x5 of page 1 is 0x85. Signed-off-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron --- include/linux/iio/imu/adis.h | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) (limited to 'include/linux/iio') diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h index 6402a08c0e6..e82cd0827e9 100644 --- a/include/linux/iio/imu/adis.h +++ b/include/linux/iio/imu/adis.h @@ -14,8 +14,11 @@ #include #include -#define ADIS_WRITE_REG(reg) (0x80 | (reg)) -#define ADIS_READ_REG(reg) (reg) +#define ADIS_WRITE_REG(reg) ((0x80 | (reg))) +#define ADIS_READ_REG(reg) ((reg) & 0x7f) + +#define ADIS_PAGE_SIZE 0x80 +#define ADIS_REG_PAGE_ID 0x00 /** * struct adis_data - ADIS chip variant specific data @@ -40,6 +43,8 @@ struct adis_data { const char * const *status_error_msgs; unsigned int status_error_mask; + + bool has_paging; }; struct adis { @@ -51,6 +56,7 @@ struct adis { struct mutex txrx_lock; struct spi_message msg; struct spi_transfer *xfer; + unsigned int current_page; void *buffer; uint8_t tx[10] ____cacheline_aligned; -- cgit v1.2.3-70-g09d2