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>
8 #include <linux/bitfield.h>
9 #include <linux/delay.h>
10 #include <linux/dev_printk.h>
11 #include <linux/module.h>
12 #include <linux/regmap.h>
13 #include <linux/types.h>
15 #include <asm/unaligned.h>
17 #include <media/v4l2-cci.h>
19 int cci_read(struct regmap *map, u32 reg, u64 *val, int *err)
28 len = FIELD_GET(CCI_REG_WIDTH_MASK, reg);
29 reg = FIELD_GET(CCI_REG_ADDR_MASK, reg);
31 ret = regmap_bulk_read(map, reg, buf, len);
33 dev_err(regmap_get_device(map), "Error reading reg 0x%4x: %d\n",
43 *val = get_unaligned_be16(buf);
46 *val = get_unaligned_be24(buf);
49 *val = get_unaligned_be32(buf);
52 *val = get_unaligned_be64(buf);
55 dev_err(regmap_get_device(map), "Error invalid reg-width %u for reg 0x%04x\n",
67 EXPORT_SYMBOL_GPL(cci_read);
69 int cci_write(struct regmap *map, u32 reg, u64 val, int *err)
78 len = FIELD_GET(CCI_REG_WIDTH_MASK, reg);
79 reg = FIELD_GET(CCI_REG_ADDR_MASK, reg);
86 put_unaligned_be16(val, buf);
89 put_unaligned_be24(val, buf);
92 put_unaligned_be32(val, buf);
95 put_unaligned_be64(val, buf);
98 dev_err(regmap_get_device(map), "Error invalid reg-width %u for reg 0x%04x\n",
104 ret = regmap_bulk_write(map, reg, buf, len);
106 dev_err(regmap_get_device(map), "Error writing reg 0x%4x: %d\n",
115 EXPORT_SYMBOL_GPL(cci_write);
117 int cci_update_bits(struct regmap *map, u32 reg, u64 mask, u64 val, int *err)
122 ret = cci_read(map, reg, &readval, err);
126 val = (readval & ~mask) | (val & mask);
128 return cci_write(map, reg, val, err);
130 EXPORT_SYMBOL_GPL(cci_update_bits);
132 int cci_multi_reg_write(struct regmap *map, const struct cci_reg_sequence *regs,
133 unsigned int num_regs, int *err)
138 for (i = 0; i < num_regs; i++) {
139 ret = cci_write(map, regs[i].reg, regs[i].val, err);
146 EXPORT_SYMBOL_GPL(cci_multi_reg_write);
148 #if IS_ENABLED(CONFIG_V4L2_CCI_I2C)
149 struct regmap *devm_cci_regmap_init_i2c(struct i2c_client *client,
152 struct regmap_config config = {
153 .reg_bits = reg_addr_bits,
155 .reg_format_endian = REGMAP_ENDIAN_BIG,
156 .disable_locking = true,
159 return devm_regmap_init_i2c(client, &config);
161 EXPORT_SYMBOL_GPL(devm_cci_regmap_init_i2c);
164 MODULE_LICENSE("GPL");
165 MODULE_AUTHOR("Hans de Goede <hansg@kernel.org>");
166 MODULE_DESCRIPTION("MIPI Camera Control Interface (CCI) support");