/* * File : i2c_dev.c * This file is part of RT-Thread RTOS * COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * * Change Logs: * Date Author Notes * 2012-04-25 weety first version */ #include <rtdevice.h> static rt_err_t i2c_bus_device_init(rt_device_t dev) { struct rt_i2c_bus_device *bus = (struct rt_i2c_bus_device *)dev->user_data; RT_ASSERT(bus != RT_NULL); return RT_EOK; } static rt_size_t i2c_bus_device_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t count) { rt_uint16_t addr; rt_uint16_t flags; struct rt_i2c_bus_device *bus = (struct rt_i2c_bus_device *)dev->user_data; RT_ASSERT(bus != RT_NULL); RT_ASSERT(buffer != RT_NULL); i2c_dbg("I2C bus dev [%s] reading %u bytes.\n", dev->parent.name, count); addr = pos & 0xffff; flags = (pos >> 16) & 0xffff; return rt_i2c_master_recv(bus, addr, flags, buffer, count); } static rt_size_t i2c_bus_device_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t count) { rt_uint16_t addr; rt_uint16_t flags; struct rt_i2c_bus_device *bus = (struct rt_i2c_bus_device *)dev->user_data; RT_ASSERT(bus != RT_NULL); RT_ASSERT(buffer != RT_NULL); i2c_dbg("I2C bus dev writing %u bytes.\n", dev->parent.name, count); addr = pos & 0xffff; flags = (pos >> 16) & 0xffff; return rt_i2c_master_send(bus, addr, flags, buffer, count); } static rt_err_t i2c_bus_device_control(rt_device_t dev, rt_uint8_t cmd, void *args) { rt_err_t ret; struct rt_i2c_priv_data *priv_data; struct rt_i2c_bus_device *bus = (struct rt_i2c_bus_device *)dev->user_data; RT_ASSERT(bus != RT_NULL); switch (cmd) { /* set 10-bit addr mode */ case RT_I2C_DEV_CTRL_10BIT: bus->flags |= RT_I2C_ADDR_10BIT; break; case RT_I2C_DEV_CTRL_ADDR: bus->addr = *(rt_uint16_t *)args; break; case RT_I2C_DEV_CTRL_TIMEOUT: bus->timeout = *(rt_uint32_t *)args; break; case RT_I2C_DEV_CTRL_RW: priv_data = (struct rt_i2c_priv_data *)args; ret = rt_i2c_transfer(bus, priv_data->msgs, priv_data->number); if (ret < 0) { return -RT_EIO; } break; default: break; } return RT_EOK; } rt_err_t rt_i2c_bus_device_device_init(struct rt_i2c_bus_device *bus, const char *name) { struct rt_device *device; RT_ASSERT(bus != RT_NULL); device = &bus->parent; device->user_data = bus; /* set device type */ device->type = RT_Device_Class_I2CBUS; /* initialize device interface */ device->init = i2c_bus_device_init; device->open = RT_NULL; device->close = RT_NULL; device->read = i2c_bus_device_read; device->write = i2c_bus_device_write; device->control = i2c_bus_device_control; /* register to device manager */ rt_device_register(device, name, RT_DEVICE_FLAG_RDWR); return RT_EOK; }