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iio: inkern: Add of_xlate function to struct iio_info

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When #iio-cells is greater than '0', the driver could provide
a custom of_xlate function that reads the *args* and returns
the appropriate index in registered IIO channels array.

Add simple translation function, suitable for the most 1:1
mapped channels in IIO chips, and use it when driver did not
provide custom implementation.

Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Ivan T. Ivanov 2014-10-22 18:29:43 +03:00 • committed by Jonathan Cameron
commit acd8256723
2 changed files with 36 additions and 5 deletions
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8
include/linux/iio/iio.h
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@ -13,6 +13,7 @@
#include <linux/device.h>
#include <linux/cdev.h>
#include <linux/iio/types.h>
#include <linux/of.h>
/* IIO TODO LIST */
/*
* Provide means of adjusting timer accuracy.
@ -326,6 +327,11 @@ struct iio_dev;
* @update_scan_mode: function to configure device and scan buffer when
* channels have changed
* @debugfs_reg_access: function to read or write register value of device
* @of_xlate: function pointer to obtain channel specifier index.
* When #iio-cells is greater than '0', the driver could
* provide a custom of_xlate function that reads the
* *args* and returns the appropriate index in registered
* IIO channels array.
**/
struct iio_info {
struct module *driver_module;
@ -385,6 +391,8 @@ struct iio_info {
int (*debugfs_reg_access)(struct iio_dev *indio_dev,
unsigned reg, unsigned writeval,
unsigned *readval);
int (*of_xlate)(struct iio_dev *indio_dev,
const struct of_phandle_args *iiospec);
};
/**