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Commit 7741c373 authored by Jon Ringle's avatar Jon Ringle Committed by David S. Miller
Browse files

regmap: Allow installing custom reg_update_bits function 



This commit allows installing a custom reg_update_bits function for cases where
the hardware provides a mechanism to set or clear register bits without a
read/modify/write cycle. Such is the case with the Microchip ENCX24J600.

Signed-off-by: default avatarJon Ringle <jringle@gridpoint.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 937317c7

drivers/base/regmap/internal.h

+3 −0
Original line number Diff line number Diff line
@@ -98,6 +98,9 @@ struct regmap { 


	int (*reg_read)(void *context, unsigned int reg, unsigned int *val);

	int (*reg_write)(void *context, unsigned int reg, unsigned int val);

	int (*reg_update_bits)(void *context, unsigned int reg,

			       unsigned int mask, unsigned int val,

			       bool *change, bool force_write);



	bool defer_caching;

drivers/base/regmap/regmap.c

+25 −0
Original line number Diff line number Diff line
@@ -619,6 +619,7 @@ struct regmap *__regmap_init(struct device *dev, 
		goto skip_format_initialization;

	} else {

		map->reg_read  = _regmap_bus_read;

		map->reg_update_bits = bus->reg_update_bits;

	}



	reg_endian = regmap_get_reg_endian(bus, config);
@@ -2509,6 +2510,30 @@ static int _regmap_update_bits(struct regmap *map, unsigned int reg, 
	int ret;

	unsigned int tmp, orig;



	if (map->reg_update_bits) {

		ret = map->reg_update_bits(map->bus_context, reg, mask, val,

					   change, force_write);

		if (ret != 0)

			return ret;



		/* Fix up the cache by read/modify/write */

		if (!map->cache_bypass && !map->defer_caching) {

			ret = regcache_read(map, reg, &orig);

			if (ret != 0)

				return ret;



			tmp = orig & ~mask;

			tmp |= val & mask;



			ret = regcache_write(map, reg, tmp);

			if (ret != 0)

				return ret;

			if (map->cache_only)

				map->cache_dirty = true;

		}

		return ret;

	}



	ret = _regmap_read(map, reg, &orig);

	if (ret != 0)

		return ret;

include/linux/regmap.h

+4 −0
Original line number Diff line number Diff line
@@ -296,6 +296,9 @@ typedef int (*regmap_hw_reg_read)(void *context, unsigned int reg, 
				  unsigned int *val);

typedef int (*regmap_hw_reg_write)(void *context, unsigned int reg,

				   unsigned int val);

typedef int (*regmap_hw_reg_update_bits)(void *context, unsigned int reg,

					 unsigned int mask, unsigned int val,

					 bool *change, bool force_write);

typedef struct regmap_async *(*regmap_hw_async_alloc)(void);

typedef void (*regmap_hw_free_context)(void *context);
@@ -335,6 +338,7 @@ struct regmap_bus { 
	regmap_hw_gather_write gather_write;

	regmap_hw_async_write async_write;

	regmap_hw_reg_write reg_write;

	regmap_hw_reg_update_bits reg_update_bits;

	regmap_hw_read read;

	regmap_hw_reg_read reg_read;

	regmap_hw_free_context free_context;