I2C modules in linux
/drivers/i2c/bussed/i2c-s3c2410.c 定义一个platform驱动 static struct platform_driver s3c24xx_i2c_driver = { .probe = s3c24xx_i2c_probe, .remove = s3c24xx_i2c_remove, .id_table = s3c24xx_driver_ids, .driver = { .owner = THIS_MODULE, .name = "s3c-i2c", .pm = S3C24XX_DEV_PM_OPS, }, };
i2c总线驱动源码跟踪
i2c_adap_s3c_init()
platform_driver_register(drv)
drv->driver.bus = &platform_bus_type; 设备驱动依附在平台总线上
driver_register(&drv->driver); 注册设备驱动
bus_add_driver(&drv->driver)
struct driver_private *priv;
priv->driver = drv;
drv->p = priv;
priv->kobj.kset = bus->p->drivers_kset;
error = kobject_init_and_add(&priv->kobj, &driver_ktype, NULL,
"%s", drv->name);
driver_attach(drv);
bus_for_each_dev(drv->bus, NULL, drv, __driver_attach);
__driver_attach(struct device *dev, void *data)
if (!driver_match_device(drv, dev))
return 0;
if (!dev->driver)
driver_probe_device(drv, dev);
really_probe(dev, drv)
平台设备的注册：
MODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids);
跟踪平台总线的注册： 起点：Main.c kernel_init() do_basic_setup() driver_init() platform_bus_init() error = device_register(&platform_bus); if (error) return error; error = bus_register(&platform_bus_type);