160 lines
3.9 KiB
C
160 lines
3.9 KiB
C
/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2017-07-14 aubr.cool 1st version
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*/
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#include <rtthread.h>
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#include <rtdevice.h>
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#include "fm24clxx.h"
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struct fm24clxx_device
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{
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struct rt_device parent;
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struct rt_i2c_bus_device *bus;
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};
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/* RT-Thread device interface */
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static rt_err_t fm24clxx_init(rt_device_t dev)
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{
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return RT_EOK;
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}
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static rt_err_t fm24clxx_open(rt_device_t dev, rt_uint16_t oflag)
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{
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return RT_EOK;
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}
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static rt_err_t fm24clxx_close(rt_device_t dev)
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{
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return RT_EOK;
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}
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static rt_err_t fm24clxx_control(rt_device_t dev, int cmd, void *args)
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{
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return RT_EOK;
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}
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static rt_size_t fm24clxx_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
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{
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struct fm24clxx_device *fm24clxx;
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const struct fm24clxx_config *cfg;
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struct rt_i2c_msg msg[2];
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rt_uint8_t mem_addr[2] = {0,};
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rt_size_t ret = 0;
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RT_ASSERT(dev != 0);
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fm24clxx = (struct fm24clxx_device *) dev;
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RT_ASSERT(fm24clxx->parent.user_data != 0);
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cfg = (const struct fm24clxx_config *) fm24clxx->parent.user_data;
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if(pos > cfg->size)
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{
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return 0;
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}
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if(pos + size > cfg->size)
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{
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size = cfg->size - pos;
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}
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msg[0].addr = cfg->addr;
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msg[0].flags = cfg->flags | RT_I2C_WR;
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mem_addr[0] = (pos >> 8);
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mem_addr[1] = (rt_uint8_t) pos;
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msg[0].buf = (rt_uint8_t *) mem_addr;
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msg[0].len = 2;
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msg[1].addr = cfg->addr;
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msg[1].flags = cfg->flags | RT_I2C_RD;
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msg[1].buf = (rt_uint8_t *) buffer;
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msg[1].len = size;
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ret = rt_i2c_transfer(fm24clxx->bus, msg, 2);
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return (ret == 2) ? size : 0;
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}
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static rt_size_t fm24clxx_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
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{
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struct fm24clxx_device *fm24clxx;
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const struct fm24clxx_config *cfg;
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struct rt_i2c_msg msg[2];
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rt_uint8_t mem_addr[2] = {0,};
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rt_size_t ret = 0;
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RT_ASSERT(dev != 0);
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fm24clxx = (struct fm24clxx_device *) dev;
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RT_ASSERT(fm24clxx->parent.user_data != 0);
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cfg = (const struct fm24clxx_config *) fm24clxx->parent.user_data;
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if(pos > cfg->size)
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{
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return 0;
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}
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if(pos + size > cfg->size)
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{
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size = cfg->size - pos;
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}
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msg[0].addr = cfg->addr;
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msg[0].flags = cfg->flags | RT_I2C_WR;
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mem_addr[0] = (pos >> 8);
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mem_addr[1] = (rt_uint8_t) pos;
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msg[0].buf = (rt_uint8_t *) mem_addr;
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msg[0].len = 2;
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msg[1].addr = cfg->addr;
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msg[1].flags = cfg->flags | RT_I2C_WR | RT_I2C_NO_START;
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msg[1].buf = (rt_uint8_t *) buffer;
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msg[1].len = size;
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ret = rt_i2c_transfer(fm24clxx->bus, msg, 2);
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return (ret == 2) ? size : 0;
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}
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#ifdef RT_USING_DEVICE_OPS
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const static struct rt_device fm24clxx_ops =
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{
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fm24clxx_init,
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fm24clxx_open,
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fm24clxx_close,
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fm24clxx_read,
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fm24clxx_write,
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fm24clxx_control
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};
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#endif
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rt_err_t fm24clxx_register(const char *fm_device_name, const char *i2c_bus, void *user_data)
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{
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static struct fm24clxx_device fm24clxx_drv;
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struct rt_i2c_bus_device *bus;
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bus = rt_i2c_bus_device_find(i2c_bus);
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if (bus == RT_NULL)
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{
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return RT_ENOSYS;
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}
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fm24clxx_drv.bus = bus;
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fm24clxx_drv.parent.type = RT_Device_Class_Block;
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#ifdef RT_USING_DEVICE_OPS
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fm24clxx_drv.parent.ops = &fm24clxx_ops;
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#else
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fm24clxx_drv.parent.init = fm24clxx_init;
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fm24clxx_drv.parent.open = fm24clxx_open;
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fm24clxx_drv.parent.close = fm24clxx_close;
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fm24clxx_drv.parent.read = fm24clxx_read;
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fm24clxx_drv.parent.write = fm24clxx_write;
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fm24clxx_drv.parent.control = fm24clxx_control;
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#endif
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fm24clxx_drv.parent.user_data = user_data;
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return rt_device_register(&fm24clxx_drv.parent, fm_device_name, RT_DEVICE_FLAG_RDWR);
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} |