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// SPDX-License-Identifier: GPL-2.0
/*
* MIPI Camera Control Interface (CCI) register access helpers.
*
* Copyright (C) 2023 Hans de Goede <hansg@kernel.org>
*/
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/dev_printk.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/types.h>
#include <linux/unaligned.h>
#include <media/v4l2-cci.h>
int cci_read(struct regmap *map, u32 reg, u64 *val, int *err)
{
bool little_endian;
unsigned int len;
u8 buf[8];
int ret;
/*
* TODO: Fix smatch. Assign *val to 0 here in order to avoid
* failing a smatch check on caller when the caller proceeds to
* read *val without initialising it on caller's side. *val is set
* to a valid value whenever this function returns 0 but smatch
* can't figure that out currently.
*/
*val = 0;
if (err && *err)
return *err;
little_endian = reg & CCI_REG_LE;
len = CCI_REG_WIDTH_BYTES(reg);
reg = CCI_REG_ADDR(reg);
ret = regmap_bulk_read(map, reg, buf, len);
if (ret) {
dev_err(regmap_get_device(map), "Error reading reg 0x%04x: %d\n",
reg, ret);
goto out;
}
switch (len) {
case 1:
*val = buf[0];
break;
case 2:
if (little_endian)
*val = get_unaligned_le16(buf);
else
*val = get_unaligned_be16(buf);
break;
case 3:
if (little_endian)
*val = get_unaligned_le24(buf);
else
*val = get_unaligned_be24(buf);
break;
case 4:
if (little_endian)
*val = get_unaligned_le32(buf);
else
*val = get_unaligned_be32(buf);
break;
case 8:
if (little_endian)
*val = get_unaligned_le64(buf);
else
*val = get_unaligned_be64(buf);
break;
default:
dev_err(regmap_get_device(map), "Error invalid reg-width %u for reg 0x%04x\n",
len, reg);
ret = -EINVAL;
break;
}
out:
if (ret && err)
*err = ret;
return ret;
}
EXPORT_SYMBOL_GPL(cci_read);
int cci_write(struct regmap *map, u32 reg, u64 val, int *err)
{
bool little_endian;
unsigned int len;
u8 buf[8];
int ret;
if (err && *err)
return *err;
little_endian = reg & CCI_REG_LE;
len = CCI_REG_WIDTH_BYTES(reg);
reg = CCI_REG_ADDR(reg);
switch (len) {
case 1:
buf[0] = val;
break;
case 2:
if (little_endian)
put_unaligned_le16(val, buf);
else
put_unaligned_be16(val, buf);
break;
case 3:
if (little_endian)
put_unaligned_le24(val, buf);
else
put_unaligned_be24(val, buf);
break;
case 4:
if (little_endian)
put_unaligned_le32(val, buf);
else
put_unaligned_be32(val, buf);
break;
case 8:
if (little_endian)
put_unaligned_le64(val, buf);
else
put_unaligned_be64(val, buf);
break;
default:
dev_err(regmap_get_device(map), "Error invalid reg-width %u for reg 0x%04x\n",
len, reg);
ret = -EINVAL;
goto out;
}
ret = regmap_bulk_write(map, reg, buf, len);
if (ret)
dev_err(regmap_get_device(map), "Error writing reg 0x%04x: %d\n",
reg, ret);
out:
if (ret && err)
*err = ret;
return ret;
}
EXPORT_SYMBOL_GPL(cci_write);
int cci_update_bits(struct regmap *map, u32 reg, u64 mask, u64 val, int *err)
{
u64 readval;
int ret;
ret = cci_read(map, reg, &readval, err);
if (ret)
return ret;
val = (readval & ~mask) | (val & mask);
return cci_write(map, reg, val, err);
}
EXPORT_SYMBOL_GPL(cci_update_bits);
int cci_multi_reg_write(struct regmap *map, const struct cci_reg_sequence *regs,
unsigned int num_regs, int *err)
{
unsigned int i;
int ret;
for (i = 0; i < num_regs; i++) {
ret = cci_write(map, regs[i].reg, regs[i].val, err);
if (ret)
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(cci_multi_reg_write);
#if IS_ENABLED(CONFIG_V4L2_CCI_I2C)
struct regmap *devm_cci_regmap_init_i2c(struct i2c_client *client,
int reg_addr_bits)
{
struct regmap_config config = {
.reg_bits = reg_addr_bits,
.val_bits = 8,
.reg_format_endian = REGMAP_ENDIAN_BIG,
.disable_locking = true,
};
return devm_regmap_init_i2c(client, &config);
}
EXPORT_SYMBOL_GPL(devm_cci_regmap_init_i2c);
#endif
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Hans de Goede <hansg@kernel.org>");
MODULE_DESCRIPTION("MIPI Camera Control Interface (CCI) support");
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