1 /* SPDX-License-Identifier: GPL-2.0 */
3 * MIPI Camera Control Interface (CCI) register access helpers.
5 * Copyright (C) 2023 Hans de Goede <hansg@kernel.org>
10 #include <linux/types.h>
16 * struct cci_reg_sequence - An individual write from a sequence of CCI writes
18 * @reg: Register address, use CCI_REG#() macros to encode reg width
19 * @val: Register value
21 * Register/value pairs for sequences of writes.
23 struct cci_reg_sequence {
29 * Macros to define register address with the register width encoded
30 * into the higher bits.
32 #define CCI_REG_ADDR_MASK GENMASK(15, 0)
33 #define CCI_REG_WIDTH_SHIFT 16
34 #define CCI_REG_WIDTH_MASK GENMASK(19, 16)
36 #define CCI_REG8(x) ((1 << CCI_REG_WIDTH_SHIFT) | (x))
37 #define CCI_REG16(x) ((2 << CCI_REG_WIDTH_SHIFT) | (x))
38 #define CCI_REG24(x) ((3 << CCI_REG_WIDTH_SHIFT) | (x))
39 #define CCI_REG32(x) ((4 << CCI_REG_WIDTH_SHIFT) | (x))
40 #define CCI_REG64(x) ((8 << CCI_REG_WIDTH_SHIFT) | (x))
43 * cci_read() - Read a value from a single CCI register
45 * @map: Register map to read from
46 * @reg: Register address to read, use CCI_REG#() macros to encode reg width
47 * @val: Pointer to store read value
48 * @err: Optional pointer to store errors, if a previous error is set
49 * then the read will be skipped
51 * Return: %0 on success or a negative error code on failure.
53 int cci_read(struct regmap *map, u32 reg, u64 *val, int *err);
56 * cci_write() - Write a value to a single CCI register
58 * @map: Register map to write to
59 * @reg: Register address to write, use CCI_REG#() macros to encode reg width
60 * @val: Value to be written
61 * @err: Optional pointer to store errors, if a previous error is set
62 * then the write will be skipped
64 * Return: %0 on success or a negative error code on failure.
66 int cci_write(struct regmap *map, u32 reg, u64 val, int *err);
69 * cci_update_bits() - Perform a read/modify/write cycle on
70 * a single CCI register
72 * @map: Register map to update
73 * @reg: Register address to update, use CCI_REG#() macros to encode reg width
74 * @mask: Bitmask to change
75 * @val: New value for bitmask
76 * @err: Optional pointer to store errors, if a previous error is set
77 * then the update will be skipped
79 * Note this uses read-modify-write to update the bits, atomicity with regards
80 * to other cci_*() register access functions is NOT guaranteed.
82 * Return: %0 on success or a negative error code on failure.
84 int cci_update_bits(struct regmap *map, u32 reg, u64 mask, u64 val, int *err);
87 * cci_multi_reg_write() - Write multiple registers to the device
89 * @map: Register map to write to
90 * @regs: Array of structures containing register-address, -value pairs to be
91 * written, register-addresses use CCI_REG#() macros to encode reg width
92 * @num_regs: Number of registers to write
93 * @err: Optional pointer to store errors, if a previous error is set
94 * then the write will be skipped
96 * Write multiple registers to the device where the set of register, value
97 * pairs are supplied in any order, possibly not all in a single range.
99 * Use of the CCI_REG#() macros to encode reg width is mandatory.
101 * For raw lists of register-address, -value pairs with only 8 bit
102 * wide writes regmap_multi_reg_write() can be used instead.
104 * Return: %0 on success or a negative error code on failure.
106 int cci_multi_reg_write(struct regmap *map, const struct cci_reg_sequence *regs,
107 unsigned int num_regs, int *err);
109 #if IS_ENABLED(CONFIG_V4L2_CCI_I2C)
111 * devm_cci_regmap_init_i2c() - Create regmap to use with cci_*() register
114 * @client: i2c_client to create the regmap for
115 * @reg_addr_bits: register address width to use (8 or 16)
117 * Note the memory for the created regmap is devm() managed, tied to the client.
119 * Return: %0 on success or a negative error code on failure.
121 struct regmap *devm_cci_regmap_init_i2c(struct i2c_client *client,