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https://github.com/Fishwaldo/opensbi.git
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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>
75 lines
1.3 KiB
C
75 lines
1.3 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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* derivate: lib/utils/gpio/gpio.c
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#include <sbi/sbi_error.h>
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#include <sbi_utils/i2c/i2c.h>
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static SBI_LIST_HEAD(i2c_adapters_list);
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struct i2c_adapter *i2c_adapter_find(int id)
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{
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struct sbi_dlist *pos;
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sbi_list_for_each(pos, &(i2c_adapters_list)) {
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struct i2c_adapter *adap = to_i2c_adapter(pos);
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if (adap->id == id)
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return adap;
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}
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return NULL;
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}
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int i2c_adapter_add(struct i2c_adapter *ia)
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{
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if (!ia)
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return SBI_EINVAL;
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if (i2c_adapter_find(ia->id))
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return SBI_EALREADY;
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sbi_list_add(&(ia->node), &(i2c_adapters_list));
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return 0;
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}
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void i2c_adapter_remove(struct i2c_adapter *ia)
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{
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if (!ia)
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return;
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sbi_list_del(&(ia->node));
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}
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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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{
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if (!ia)
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return SBI_EINVAL;
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if (!ia->write)
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return SBI_ENOSYS;
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return ia->write(ia, addr, reg, buffer, len);
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}
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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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{
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if (!ia)
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return SBI_EINVAL;
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if (!ia->read)
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return SBI_ENOSYS;
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return ia->read(ia, addr, reg, buffer, len);
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}
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