新增设备驱动模型，为设备和驱动提供高层视图 (#227)

* 添加base mod

* 添加设备驱动模型相关文件

* 删除单独的mod文件，使用mod.rs，修改一些格式上的问题

* 移动驱动错误类型到该文件

* 修改一些格式上的问题

kernel/src/driver/base/platform/mod.rs

@@ -0,0 +1,347 @@
+use alloc::{
+    collections::{BTreeSet, BTreeMap}, 
+    vec::Vec, sync::Arc
+};
+use lazy_static::lazy_static;
+use core::fmt::Debug;
+use super::device::{
+    bus::{
+        BusDriver, 
+        BusState, 
+        BUS_MANAGER, 
+        Bus
+    },
+    driver::Driver, 
+    IdTable, 
+    DeviceError, 
+    DeviceState, 
+    DeviceType, Device    
+};
+use crate::libs::{rwlock::RwLock, mutex::Mutex};
+use platform_device::PlatformDevice;
+use platform_driver::PlatformDriver;
+
+pub mod platform_device;
+pub mod platform_driver;
+
+/// @brief: platform总线匹配表
+///         总线上的设备和驱动都存在一份匹配表
+///         根据匹配表条目是否匹配来辨识设备和驱动能否进行匹配
+#[derive(Debug)]
+pub struct CompatibleTable(BTreeSet<&'static str>);
+
+/// @brief: 匹配表操作方法集
+impl CompatibleTable {
+    /// @brief: 创建一个新的匹配表
+    /// @parameter id_vec: 匹配条目数组
+    /// @return: 匹配表
+    #[inline]
+    #[allow(dead_code)]
+    pub fn new(id_vec: Vec<&'static str>) -> CompatibleTable {
+        CompatibleTable(BTreeSet::from_iter(id_vec.iter().cloned()))
+    }
+
+    /// @brief: 判断两个匹配表是否能够匹配
+    /// @parameter other: 其他匹配表
+    /// @return: 如果匹配成功，返回true，否则，返回false
+    #[allow(dead_code)]
+    pub fn matches(&self, other: &CompatibleTable) -> bool {
+        for id in &self.0 {
+            if other.0.contains(id) {
+                return true;
+            }
+        }
+        return false;
+    }
+}
+
+/// @brief: platform总线驱动
+#[derive(Debug)]
+pub struct  PlatformBusDriver {
+    drivers: RwLock<BTreeMap<IdTable, Arc<dyn PlatformDriver>>>, // 总线上所有驱动
+    devices: RwLock<BTreeMap<IdTable, Arc<dyn PlatformDevice>>>, // 总线上所有设备
+}
+
+impl PlatformBusDriver {
+    /// @brief: 创建一个platform总线驱动，该驱动用于匹配plaform总线
+    /// @parameter: None
+    /// @return: platfor总线驱动
+    #[inline]
+    #[allow(dead_code)]
+    pub fn new() -> Self {
+        Self {
+            drivers: RwLock::new(BTreeMap::new()),
+            devices: RwLock::new(BTreeMap::new()),
+        }
+    }
+
+    /// @brief: 获取该驱动的匹配表
+    /// @parameter: None
+    /// @return: 驱动的匹配表
+    #[inline]
+    #[allow(dead_code)]
+    fn get_compatible_table(&self) -> CompatibleTable {
+        CompatibleTable::new(vec!["platform"])
+    }
+
+    /// @brief: 根据设备标识符获取platform总线上的设备
+    /// @parameter id_table: 设备标识符
+    /// @return: 总线上的设备
+    #[inline]
+    #[allow(dead_code)]
+    fn get_device(&self, id_table: &IdTable) -> Option<Arc<dyn PlatformDevice>> {
+        let device_map = self.devices.read();
+        return device_map.get(id_table).cloned();
+    }
+
+    /// @brief: 根据设备驱动标识符获取platform总线上的驱动
+    /// @parameter id_table: 设备驱动标识符
+    /// @return: 总线上的驱动
+    #[inline]
+    #[allow(dead_code)]
+    fn get_driver(&self, id_table: &IdTable) -> Option<Arc<dyn PlatformDriver>> {
+        let driver_map = self.drivers.read();
+        return driver_map.get(id_table).cloned();
+    }
+
+    /// @brief: 注册platform类型驱动
+    /// @parameter driver: platform类型驱动，该驱动需要实现PlatformDriver trait
+    /// @return: 注册成功，返回Ok(()),，注册失败，返回BusError类型
+    #[allow(dead_code)]
+    fn register_platform_driver(&mut self, driver: Arc<dyn PlatformDriver>) -> Result<(), DeviceError> {
+        let id_table = driver.get_id_table();
+
+        let mut drivers = self.drivers.write();
+        // 如果存在同类型的驱动，返回错误
+        if drivers.contains_key(&id_table) {
+            return Err(DeviceError::DriverExists);
+        } else {        
+            drivers.insert(id_table.clone(), driver.clone());
+            return Ok(());
+        }
+    }
+
+    /// @brief: 卸载platform类型驱动
+    /// @parameter driver: platform类型驱动，该驱动需挂载在plaform总线之上
+    /// @return: None
+    #[allow(dead_code)]
+    #[inline]
+    fn unregister_platform_driver(&mut self, driver: Arc<dyn PlatformDriver>) {
+        let id_table = driver.get_id_table();
+        self.drivers.write().remove(&id_table);
+    }
+
+    /// @brief: 注册platform类型设备
+    /// @parameter driver: platform类型设备，该驱动需要实现PlatformDevice trait
+    /// @return: 注册成功，返回Ok(()),，注册失败，返回BusError类型
+    #[allow(dead_code)]
+    fn register_platform_device(&mut self, device: Arc<dyn PlatformDevice>) -> Result<(), DeviceError> {
+        let id_table = device.get_id_table();
+
+        let mut devices = self.devices.write();
+        if devices.contains_key(&id_table) {
+            return Err(DeviceError::DeviceExists);
+        } else {
+            devices.insert(id_table.clone(), device.clone());
+            return Ok(());
+        }
+    }
+
+    /// @brief: 卸载platform类型设备
+    /// @parameter device: platform类型设备，该驱设备需挂载在plaform总线之上
+    /// @return: None
+    #[inline]
+    #[allow(dead_code)]
+    fn unregister_platform_device(&mut self, device: Arc<dyn PlatformDevice>) {
+        let id_table = device.get_id_table();
+        self.devices.write().remove(&id_table);
+    }
+
+    /// @brief: 匹配platform类型驱动
+    /// @parameter driver: platform类型驱动
+    /// @return: 如果匹配成功，返回成功驱动的设备数，否则，返回BusError类型
+    #[allow(dead_code)]
+    fn driver_match_device(&self, driver: Arc<dyn PlatformDriver>) -> Result<i32, DeviceError> {
+        let mut num = 0;
+        let devices = self.devices.read();
+
+        for (_dev_id_table, device) in devices.iter() {
+            if device.get_compatible_table().matches(&driver.get_compatible_table()) {              
+                if !device.is_initialized() {
+                    // 设备未初始化，调用驱动probe函数
+                    match driver.probe(device.clone()) {
+                        Ok(()) => {
+                            num = num + 1;
+                            device.set_state(DeviceState::Initialized)
+                        },
+                        // 可以驱动很多设备，一个设备初始化出错即返回
+                        Err(_) => return Err(DeviceError::InitializeFailed),
+                    }
+                }
+            }
+        }
+        if num == 0 {
+            return Err(DeviceError::NoDeviceForDriver);
+        } else {
+            return Ok(num);
+        }
+    }
+
+    /// @brief: 匹配platform上的设备
+    /// @parameter driver: platform类型设备
+    /// @return: 如果匹配成功，返回Ok(())，否则，返回BusError类型
+    #[allow(dead_code)]
+    fn device_match_driver(&self, device: Arc<dyn PlatformDevice>) -> Result<(), DeviceError> {
+        let drivers = self.drivers.read();
+        for (_drv_id_table, driver) in &*drivers {
+            if driver.get_compatible_table().matches(&device.get_compatible_table()) {
+                match driver.probe(device.clone()) {
+                    Ok(_driver) => {                
+                        // 将设备状态置为已初始化
+                        device.set_state(DeviceState::Initialized);
+                        return Ok(());
+                    }
+                    Err(_) => return Err(DeviceError::InitializeFailed),
+                }
+            }
+        }
+        return Err(DeviceError::NoDriverForDevice);
+    }
+}
+
+/// @brief: 为PlatformBusDriver实现Driver trait
+impl Driver for PlatformBusDriver {
+    fn get_id_table(&self) -> IdTable {
+        IdTable::new("PlatformBusDriver", 0)
+    }
+}
+
+/// @brief: 为PlatformBusDriver实现BusDriver trait
+impl BusDriver for PlatformBusDriver {
+    fn is_empty(&self) -> bool {
+        if self.devices.read().is_empty() && self.drivers.read().is_empty() {
+            return true;
+        } else {
+            return false;
+        }
+    }
+}
+
+/// @brief: platform总线
+#[derive(Debug)]
+#[derive(Clone)]
+pub struct Platform { 
+    state: Arc<Mutex<BusState>>, // 总线状态
+    driver: Option<Arc<PlatformBusDriver>>, // 总线驱动
+}
+
+/// @brief: platform方法集
+impl Platform {
+    /// @brief: 创建一个platform总线实例
+    /// @parameter: None
+    /// @return: platform总线实例
+    pub fn new() -> Self {
+        Self {
+            state: Arc::new(Mutex::new(BusState::NotInitialized)),
+            driver: Option::None,
+        }
+    }
+
+    /// @brief: 获取总线的匹配表
+    /// @parameter: None
+    /// @return: platform总线匹配表
+    #[inline]
+    #[allow(dead_code)]
+    fn get_compatible_table(&self) -> CompatibleTable {
+        CompatibleTable::new(vec!["platform"])
+    }
+
+    /// @brief: 判断总线是否初始化
+    /// @parameter: None
+    /// @return: 已初始化，返回true，否则，返回false
+    #[inline]
+    #[allow(dead_code)]
+    fn is_initialized(&self) -> bool {
+        let state = self.state.lock();
+        match *state {
+            BusState::Initialized => true,
+            _ => false,
+        } 
+    }
+
+    /// @brief: 设置总线状态
+    /// @parameter set_state: 总线状态BusState
+    /// @return: None
+    #[inline]
+    fn set_state(&self, set_state: BusState) {
+        let mut state = self.state.lock();
+        *state = set_state;
+    }
+
+    /// @brief: 获取总线状态
+    /// @parameter: None
+    /// @return: 总线状态
+    #[inline]
+    #[allow(dead_code)]
+    fn get_state(&self) -> BusState {
+        let state = self.state.lock();
+        return *state;
+    }
+
+    /// @brief: 
+    /// @parameter: None
+    /// @return: 总线状态
+    #[inline]
+    #[allow(dead_code)]
+    fn set_driver(&mut self, driver: Option<Arc<PlatformBusDriver>>) {
+        self.driver = driver;
+    }
+}
+
+/// @brief: 为Platform实现Device trait，platform总线也是一种设备，属于总线设备类型
+impl Device for Platform {
+    /// @brief: 获取platform设备类型
+    /// @parameter: None
+    /// @return: Bus类型
+    #[inline]
+    #[allow(dead_code)]
+    fn get_type(&self) -> DeviceType {
+        return DeviceType::Bus;
+    }
+
+    /// @brief: 获取platform设备标识符
+    /// @parameter: None
+    /// @return: platform总线设备标识符
+    #[inline]
+    #[allow(dead_code)]
+    fn get_id_table(&self) -> IdTable {
+        IdTable::new("platform", 0)
+    }
+}
+
+/// @brief: 为Platform实现Bus trait，platform总线是一种总线设备
+impl Bus for Platform {}
+
+lazy_static! {
+    pub static ref BUS_PLATFORM_DRIVER: Arc<PlatformBusDriver> = Arc::new(PlatformBusDriver::new());
+    pub static ref BUS_PLATFORM_DEVICE: Arc<Platform> = Arc::new(Platform::new());
+}
+
+/// @brief: 初始化platform总线
+/// @parameter: None
+/// @return: None
+#[allow(dead_code)]
+pub fn platform_bus_init() {
+    BUS_MANAGER.add_bus_driver(BUS_PLATFORM_DRIVER.get_id_table(), BUS_PLATFORM_DRIVER.clone());
+    BUS_MANAGER.add_bus(BUS_PLATFORM_DEVICE.get_id_table(), BUS_PLATFORM_DEVICE.clone());
+    BUS_PLATFORM_DEVICE.set_state(BusState::Initialized);
+}
+
+#[no_mangle]
+extern "C" fn c_platform_bus_init() {
+    BUS_MANAGER.add_bus_driver(BUS_PLATFORM_DRIVER.get_id_table(), BUS_PLATFORM_DRIVER.clone());
+    BUS_MANAGER.add_bus(BUS_PLATFORM_DEVICE.get_id_table(), BUS_PLATFORM_DEVICE.clone());
+    BUS_PLATFORM_DEVICE.set_state(BusState::Initialized);
+}
+
+