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v4l2-cci.h
/* SPDX-License-Identifier: GPL-2.0 */ /* * MIPI Camera Control Interface (CCI) register access helpers. * * Copyright (C) 2023 Hans de Goede <hansg@kernel.org> */ #ifndef _V4L2_CCI_H #define _V4L2_CCI_H #include <linux/bitfield.h> #include <linux/bits.h> #include <linux/types.h> struct i2c_client; struct regmap; /** * struct cci_reg_sequence - An individual write from a sequence of CCI writes * * @reg: Register address, use CCI_REG#() macros to encode reg width * @val: Register value * * Register/value pairs for sequences of writes. */ struct cci_reg_sequence { u32 reg; u64 val; }; /* * Macros to define register address with the register width encoded * into the higher bits. */ #define CCI_REG_ADDR_MASK GENMASK(15, 0) #define CCI_REG_WIDTH_SHIFT 16 #define CCI_REG_WIDTH_MASK GENMASK(19, 16) /* * Private CCI register flags, for the use of drivers. */ #define CCI_REG_PRIVATE_SHIFT 28U #define CCI_REG_PRIVATE_MASK GENMASK(31U, CCI_REG_PRIVATE_SHIFT) #define CCI_REG_WIDTH_BYTES(x) FIELD_GET(CCI_REG_WIDTH_MASK, x) #define CCI_REG_WIDTH(x) (CCI_REG_WIDTH_BYTES(x) << 3) #define CCI_REG_ADDR(x) FIELD_GET(CCI_REG_ADDR_MASK, x) #define CCI_REG_LE BIT(20) #define CCI_REG8(x) ((1 << CCI_REG_WIDTH_SHIFT) | (x)) #define CCI_REG16(x) ((2 << CCI_REG_WIDTH_SHIFT) | (x)) #define CCI_REG24(x) ((3 << CCI_REG_WIDTH_SHIFT) | (x)) #define CCI_REG32(x) ((4 << CCI_REG_WIDTH_SHIFT) | (x)) #define CCI_REG64(x) ((8 << CCI_REG_WIDTH_SHIFT) | (x)) #define CCI_REG16_LE(x) (CCI_REG_LE | (2U << CCI_REG_WIDTH_SHIFT) | (x)) #define CCI_REG24_LE(x) (CCI_REG_LE | (3U << CCI_REG_WIDTH_SHIFT) | (x)) #define CCI_REG32_LE(x) (CCI_REG_LE | (4U << CCI_REG_WIDTH_SHIFT) | (x)) #define CCI_REG64_LE(x) (CCI_REG_LE | (8U << CCI_REG_WIDTH_SHIFT) | (x)) /** * cci_read() - Read a value from a single CCI register * * @map: Register map to read from * @reg: Register address to read, use CCI_REG#() macros to encode reg width * @val: Pointer to store read value * @err: Optional pointer to store errors, if a previous error is set * then the read will be skipped * * Return: %0 on success or a negative error code on failure. */ int cci_read(struct regmap *map, u32 reg, u64 *val, int *err); /** * cci_write() - Write a value to a single CCI register * * @map: Register map to write to * @reg: Register address to write, use CCI_REG#() macros to encode reg width * @val: Value to be written * @err: Optional pointer to store errors, if a previous error is set * then the write will be skipped * * Return: %0 on success or a negative error code on failure. */ int cci_write(struct regmap *map, u32 reg, u64 val, int *err); /** * cci_update_bits() - Perform a read/modify/write cycle on * a single CCI register * * @map: Register map to update * @reg: Register address to update, use CCI_REG#() macros to encode reg width * @mask: Bitmask to change * @val: New value for bitmask * @err: Optional pointer to store errors, if a previous error is set * then the update will be skipped * * Note this uses read-modify-write to update the bits, atomicity with regards * to other cci_*() register access functions is NOT guaranteed. * * Return: %0 on success or a negative error code on failure. */ int cci_update_bits(struct regmap *map, u32 reg, u64 mask, u64 val, int *err); /** * cci_multi_reg_write() - Write multiple registers to the device * * @map: Register map to write to * @regs: Array of structures containing register-address, -value pairs to be * written, register-addresses use CCI_REG#() macros to encode reg width * @num_regs: Number of registers to write * @err: Optional pointer to store errors, if a previous error is set * then the write will be skipped * * Write multiple registers to the device where the set of register, value * pairs are supplied in any order, possibly not all in a single range. * * Use of the CCI_REG#() macros to encode reg width is mandatory. * * For raw lists of register-address, -value pairs with only 8 bit * wide writes regmap_multi_reg_write() can be used instead. * * Return: %0 on success or a negative error code on failure. */ int cci_multi_reg_write(struct regmap *map, const struct cci_reg_sequence *regs, unsigned int num_regs, int *err); #if IS_ENABLED(CONFIG_V4L2_CCI_I2C) /** * devm_cci_regmap_init_i2c() - Create regmap to use with cci_*() register * access functions * * @client: i2c_client to create the regmap for * @reg_addr_bits: register address width to use (8 or 16) * * Note the memory for the created regmap is devm() managed, tied to the client. * * Return: %0 on success or a negative error code on failure. */ struct regmap *devm_cci_regmap_init_i2c(struct i2c_client *client, int reg_addr_bits); #endif #endif
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