forked from Mirrors/opensbi
2c964a2e15
Helper library to keep track of registered I2C adapters, identified by dts offset, basic send/read functions and adapter configuration (enable, set dividers, etc...). Tested-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Alexandre Ghiti <alexandre.ghiti@canonical.com> Tested-by: Alexandre Ghiti <alexandre.ghiti@canonical.com> Signed-off-by: Nikita Shubin <n.shubin@yadro.com>
86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 YADRO
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*
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* Authors:
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* Nikita Shubin <n.shubin@yadro.com>
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*/
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#ifndef __I2C_H__
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#define __I2C_H__
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#include <sbi/sbi_types.h>
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#include <sbi/sbi_list.h>
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/** Representation of a I2C adapter */
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struct i2c_adapter {
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/** Pointer to I2C driver owning this I2C adapter */
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void *driver;
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/** Unique ID of the I2C adapter assigned by the driver */
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int id;
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/**
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* Send buffer to given address, register
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*
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* @return 0 on success and negative error code on failure
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*/
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int (*write)(struct i2c_adapter *ia, uint8_t addr, uint8_t reg,
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uint8_t *buffer, int len);
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/**
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* Read buffer from given address, register
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*
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* @return 0 on success and negative error code on failure
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*/
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int (*read)(struct i2c_adapter *ia, uint8_t addr, uint8_t reg,
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uint8_t *buffer, int len);
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/** List */
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struct sbi_dlist node;
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};
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static inline struct i2c_adapter *to_i2c_adapter(struct sbi_dlist *node)
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{
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return container_of(node, struct i2c_adapter, node);
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}
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/** Find a registered I2C adapter */
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struct i2c_adapter *i2c_adapter_find(int id);
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/** Register I2C adapter */
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int i2c_adapter_add(struct i2c_adapter *ia);
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/** Un-register I2C adapter */
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void i2c_adapter_remove(struct i2c_adapter *ia);
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/** Send to device on I2C adapter bus */
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int i2c_adapter_write(struct i2c_adapter *ia, uint8_t addr, uint8_t reg,
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uint8_t *buffer, int len);
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/** Read from device on I2C adapter bus */
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int i2c_adapter_read(struct i2c_adapter *ia, uint8_t addr, uint8_t reg,
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uint8_t *buffer, int len);
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static inline int i2c_adapter_reg_write(struct i2c_adapter *ia, uint8_t addr,
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uint8_t reg, uint8_t val)
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{
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return i2c_adapter_write(ia, addr, reg, &val, 1);
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}
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static inline int i2c_adapter_reg_read(struct i2c_adapter *ia, uint8_t addr,
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uint8_t reg, uint8_t *val)
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{
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uint8_t buf;
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int ret = i2c_adapter_read(ia, addr, reg, &buf, 1);
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if (ret)
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return ret;
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*val = buf;
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return 0;
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}
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#endif
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