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regmap: introduce explicit bus_context for bus callbacks

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The only context needed by I2C and SPI bus definitions is the device
itself; this can be converted to an i2c_client or spi_device in order
to perform IO on the device. However, other bus types may need more
context in order to perform IO. Enable this by having regmap_init accept
a bus_context parameter, and pass this to all bus callbacks. The
existing callbacks simply pass the struct device here. Future bus types
may pass something else.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Stephen Warren 2012-04-04 15:48:30 -06:00 • committed by Mark Brown
parent dd775ae254
commit 0135bbcc7a
5 changed files with 37 additions and 19 deletions
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10
include/linux/regmap.h
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@ -97,14 +97,15 @@ struct regmap_config {
u8 write_flag_mask;
};
typedef int (*regmap_hw_write)(struct device *dev, const void *data,
typedef int (*regmap_hw_write)(void *context, const void *data,
size_t count);
typedef int (*regmap_hw_gather_write)(struct device *dev,
typedef int (*regmap_hw_gather_write)(void *context,
const void *reg, size_t reg_len,
const void *val, size_t val_len);
typedef int (*regmap_hw_read)(struct device *dev,
typedef int (*regmap_hw_read)(void *context,
const void *reg_buf, size_t reg_size,
void *val_buf, size_t val_size);
typedef void (*regmap_hw_free_context)(void *context);
/**
* Description of a hardware bus for the register map infrastructure.
@ -121,11 +122,13 @@ struct regmap_bus {
regmap_hw_write write;
regmap_hw_gather_write gather_write;
regmap_hw_read read;
regmap_hw_free_context free_context;
u8 read_flag_mask;
};
struct regmap *regmap_init(struct device *dev,
const struct regmap_bus *bus,
void *bus_context,
const struct regmap_config *config);
struct regmap *regmap_init_i2c(struct i2c_client *i2c,
const struct regmap_config *config);
@ -134,6 +137,7 @@ struct regmap *regmap_init_spi(struct spi_device *dev,
struct regmap *devm_regmap_init(struct device *dev,
const struct regmap_bus *bus,
void *bus_context,
const struct regmap_config *config);
struct regmap *devm_regmap_init_i2c(struct i2c_client *i2c,
const struct regmap_config *config);