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Linux设备驱动模型:platform总线匹配机制与实现

  • 2026-03-23 19:57:16
Linux设备驱动模型:platform总线匹配机制与实现

0、platform虚拟平台总线

latform总线是一种虚拟总线,主要用于连接集成在片上系统(SoC)内部的、无法通过传统总线(如PCI、USB)枚举发现的设备

常见的使用了platform总线的内核模块或驱动类型:

  1. 字符设备驱动

    • GPIO驱动drivers/gpio/gpio-*.c

    • I2C控制器驱动drivers/i2c/busses/i2c-*.c

    • SPI控制器驱动drivers/spi/spi-*.c

    • 串口驱动drivers/tty/serial/目录下的许多驱动,如serial_omap.camba-pl011.c等。

    • 看门狗驱动drivers/watchdog/*.c

    • PWM驱动drivers/pwm/pwm-*.c

    • 硬件随机数发生器(RNG)驱动

  2. 块设备/存储驱动

    • MMC/SD/SDIO主机控制器驱动
      drivers/mmc/host/*.c
  3. 网络设备驱动

    • 许多集成的以太网MAC控制器驱动,例如某些drivers/net/ethernet/下的驱动。
  4. 输入子系统驱动

    • 集成的按键、触摸屏控制器驱动等。
  5. 电源管理/时钟/复位驱动

    • 这些是更底层的基础设施驱动,也常以platform设备的形式存在。

1、平台总线的注册

/driver/base/platform.c中实现

structbus_typeplatform_bus_type = {    .name        = "platform",    .dev_groups    = platform_dev_groups,    .match        = platform_match,    .uevent        = platform_uevent,    .dma_configure    = platform_dma_configure,    .pm        = &platform_dev_pm_ops,};int __init platform_bus_init(void){...    error =  bus_register(&platform_bus_type);...return error;
  • struct bus_type platform_bus_type -  定义平台总线
  • platform_match - 平台总线规则匹配函数
  • platform_bus_init() - 平台总线初始化函数,内核启动后被执行

平台总线的匹配规则:

staticintplatform_match(struct device *dev, struct device_driver *drv){structplatform_device *pdev = to_platform_device(dev);structplatform_driver *pdrv = to_platform_driver(drv);/* When driver_override is set, only bind to the matching driver */if (pdev->driver_override)                                 //如果定义了这个预先匹配这个return !strcmp(pdev->driver_override, drv->name);/* Attempt an OF style match first */if (of_driver_match_device(dev, drv))           return1;/* Then try ACPI style match */if (acpi_driver_match_device(dev, drv))  return1;/* Then try to match against the id table */if (pdrv->id_table)                                       return platform_match_id(pdrv->id_table, pdev) != NULL;/* fall-back to driver name match */return (strcmp(pdev->name, drv->name) == 0);}
  • strcmp(pdev->driver_override, drv->name) - 如果设置了设备的driver_override字段则忽略其他匹配方式,进行设备driver_override字段和驱动name字段的匹配
  • of_driver_match_device - 设备树匹配
  • acpi_driver_match_device - ACPI方式匹配,用的比较少
  • platform_match_id - id_table表匹配
  • (strcmp(pdev->name, drv->name) == 0) - 设备和驱动名字匹配

2、platform device 平台设备

2.1 、描述平台设备结构体

//platform_device.hstructplatform_device {constchar    *name;              //使用名字来比较是用的最多的int        id;                     //device的id 也是用来匹配去当的bool        id_auto;structdevicedev;//基本的设备结构    u32        num_resources;         //硬件资源列表的个数structresource    *resource;//硬件资源列表conststructplatform_device_id    *id_entry;//也可以使用这个id_entry来比较char *driver_override;               /* Driver name to force a match 强制匹配,如果设置了这个参数会忽略name 和 id那些参数*//* MFD cell pointer */structmfd_cell *mfd_cell;/* arch specific additions */structpdev_archdataarchdata;};

从下platform_devicestruct device dev成员的可以看出,platform_device继承自device(最基本的设备对象)和**struct resource resource*

platform_device作用:关联硬件代码,描述驱动要使用到的硬件资源

2.2、平台设备注册/卸载函数

//注册平台设备externintplatform_device_register(struct platform_device *dev);//卸载平台设备externvoidplatform_device_unregister(struct platform_device *dev);

2.3、硬件资源使用struct resource结构体描述

//资源结构体structresource {resource_size_t start;    resource_size_t end;       constchar *name;          unsignedlong flags; unsignedlong desc;structresource *parent, *sibling, *child;};
  • start - 资源开始值
  • end - 资源结束值
  • flags - 资源的类型
    • IORESOURCE_MEM:内存地址
    • IORESOURCE_IO:IO端口
    • IORESOURCE_DMA:DMA传输
    • IORESOURCE_IRQ:中断

2.4、驱动获取设备描述的硬件资源

//给驱动获取平台设备的提供的资源externstruct resource *platform_get_resource(struct platform_device *dev, unsignedint type, unsignedint num);
  • dev  -  平台设备
  • type -  资源类型
  • num -  platform_device字段resources数组中资源编号

3、platform driver 平台驱动

3.1 描述平台驱动结构体

//platform_device.hstructplatform_driver {int (*probe)(struct platform_device *);         //一般是做初始化工作,注册file_operations结构体等int (*remove)(struct platform_device *);void (*shutdown)(struct platform_device *);int (*suspend)(struct platform_device *, pm_message_t state);int (*resume)(struct platform_device *);structdevice_driverdriver;conststructplatform_device_id *id_table;//bool prevent_deferred_probe;};

platform_driver继承自struct device_driver driver

platform_driver:

关联驱动代码

重设probe()函数指针指针,设备和驱动匹配成功,probe()函数就会被执行,一般在该函数做初始化工作 驱动被卸载时int (*remove)(struct platform_device *)函数执行

3.2、平台驱动的注册

include/linux/platform_device.h

#define platform_driver_register(drv) \    __platform_driver_register(drv, THIS_MODULE)externint __platform_driver_register(struct platform_driver *,struct module *);

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  1. CONNECT:[ UseTime:0.001023s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001409s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000709s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000675s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001589s ]
  6. SELECT * FROM `set` [ RunTime:0.000583s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001812s ]
  8. SELECT * FROM `article` WHERE `id` = 478750 LIMIT 1 [ RunTime:0.001666s ]
  9. UPDATE `article` SET `lasttime` = 1774634959 WHERE `id` = 478750 [ RunTime:0.011211s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000798s ]
  11. SELECT * FROM `article` WHERE `id` < 478750 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003359s ]
  12. SELECT * FROM `article` WHERE `id` > 478750 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001295s ]
  13. SELECT * FROM `article` WHERE `id` < 478750 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009559s ]
  14. SELECT * FROM `article` WHERE `id` < 478750 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001989s ]
  15. SELECT * FROM `article` WHERE `id` < 478750 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009327s ]
0.225416s