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-rw-r--r--include/linux/regmap.h52
1 files changed, 52 insertions, 0 deletions
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 60a65cd7e1a..003c05349ae 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -20,9 +20,61 @@
struct i2c_client;
struct spi_device;
+/**
+ * Default value for a register. We use an array of structs rather
+ * than a simple array as many modern devices have very sparse
+ * register maps.
+ *
+ * @reg: Register address.
+ * @def: Register default value.
+ */
+struct reg_default {
+ unsigned int reg;
+ unsigned int def;
+};
+
+/**
+ * Configuration for the register map of a device.
+ *
+ * @reg_bits: Number of bits in a register address, mandatory.
+ * @val_bits: Number of bits in a register value, mandatory.
+ *
+ * @writeable_reg: Optional callback returning true if the register
+ * can be written to.
+ * @readable_reg: Optional callback returning true if the register
+ * can be read from.
+ * @volatile_reg: Optional callback returning true if the register
+ * value can't be cached.
+ * @precious_reg: Optional callback returning true if the rgister
+ * should not be read outside of a call from the driver
+ * (eg, a clear on read interrupt status register).
+ *
+ * @max_register: Optional, specifies the maximum valid register index.
+ * @reg_defaults: Power on reset values for registers (for use with
+ * register cache support).
+ * @num_reg_defaults: Number of elements in reg_defaults.
+ *
+ * @read_flag_mask: Mask to be set in the top byte of the register when doing
+ * a read.
+ * @write_flag_mask: Mask to be set in the top byte of the register when doing
+ * a write. If both read_flag_mask and write_flag_mask are
+ * empty the regmap_bus default masks are used.
+ */
struct regmap_config {
int reg_bits;
int val_bits;
+
+ bool (*writeable_reg)(struct device *dev, unsigned int reg);
+ bool (*readable_reg)(struct device *dev, unsigned int reg);
+ bool (*volatile_reg)(struct device *dev, unsigned int reg);
+ bool (*precious_reg)(struct device *dev, unsigned int reg);
+
+ unsigned int max_register;
+ struct reg_default *reg_defaults;
+ int num_reg_defaults;
+
+ u8 read_flag_mask;
+ u8 write_flag_mask;
};
typedef int (*regmap_hw_write)(struct device *dev, const void *data,