127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
/*
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* File : i2c_dev.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2012-04-25 weety first version
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*/
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#include <rtdevice.h>
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static rt_err_t i2c_bus_device_init(rt_device_t dev)
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{
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struct rt_i2c_bus_device *bus = (struct rt_i2c_bus_device *)dev->user_data;
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RT_ASSERT(bus != RT_NULL);
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return RT_EOK;
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}
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static rt_size_t i2c_bus_device_read(rt_device_t dev,
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rt_off_t pos,
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void *buffer,
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rt_size_t count)
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{
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rt_uint16_t addr;
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rt_uint16_t flags;
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struct rt_i2c_bus_device *bus = (struct rt_i2c_bus_device *)dev->user_data;
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RT_ASSERT(bus != RT_NULL);
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RT_ASSERT(buffer != RT_NULL);
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i2c_dbg("I2C bus dev [%s] reading %u bytes.\n", dev->parent.name, count);
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addr = pos & 0xffff;
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flags = (pos >> 16) & 0xffff;
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return rt_i2c_master_recv(bus, addr, flags, buffer, count);
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}
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static rt_size_t i2c_bus_device_write(rt_device_t dev,
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rt_off_t pos,
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const void *buffer,
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rt_size_t count)
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{
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rt_uint16_t addr;
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rt_uint16_t flags;
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struct rt_i2c_bus_device *bus = (struct rt_i2c_bus_device *)dev->user_data;
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RT_ASSERT(bus != RT_NULL);
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RT_ASSERT(buffer != RT_NULL);
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i2c_dbg("I2C bus dev writing %u bytes.\n", dev->parent.name, count);
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addr = pos & 0xffff;
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flags = (pos >> 16) & 0xffff;
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return rt_i2c_master_send(bus, addr, flags, buffer, count);
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}
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static rt_err_t i2c_bus_device_control(rt_device_t dev,
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rt_uint8_t cmd,
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void *args)
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{
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rt_err_t ret;
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struct rt_i2c_priv_data *priv_data;
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struct rt_i2c_bus_device *bus = (struct rt_i2c_bus_device *)dev->user_data;
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RT_ASSERT(bus != RT_NULL);
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switch (cmd)
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{
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/* set 10-bit addr mode */
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case RT_I2C_DEV_CTRL_10BIT:
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bus->flags |= RT_I2C_ADDR_10BIT;
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break;
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case RT_I2C_DEV_CTRL_ADDR:
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bus->addr = *(rt_uint16_t *)args;
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break;
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case RT_I2C_DEV_CTRL_TIMEOUT:
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bus->timeout = *(rt_uint32_t *)args;
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break;
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case RT_I2C_DEV_CTRL_RW:
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priv_data = (struct rt_i2c_priv_data *)args;
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ret = rt_i2c_transfer(bus, priv_data->msgs, priv_data->number);
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if (ret < 0)
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{
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return -RT_EIO;
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}
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break;
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default:
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break;
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}
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return RT_EOK;
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}
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rt_err_t rt_i2c_bus_device_device_init(struct rt_i2c_bus_device *bus,
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const char *name)
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{
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struct rt_device *device;
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RT_ASSERT(bus != RT_NULL);
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device = &bus->parent;
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device->user_data = bus;
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/* set device type */
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device->type = RT_Device_Class_I2CBUS;
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/* initialize device interface */
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device->init = i2c_bus_device_init;
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device->open = RT_NULL;
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device->close = RT_NULL;
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device->read = i2c_bus_device_read;
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device->write = i2c_bus_device_write;
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device->control = i2c_bus_device_control;
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/* register to device manager */
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rt_device_register(device, name, RT_DEVICE_FLAG_RDWR);
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return RT_EOK;
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}
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