1intdriver_probe_device(structdevice_driver *drv,structdevice *dev)2{3intret =0;45if(!device_is_registered(dev))6return-ENODEV;78pr_debug("bus: '%s': %s: matched device %s with driver %s\n",9drv->bus->name, __func__, dev_name(dev), drv->name);1011pm_runtime_barrier(dev);1...
下面是probe被调用前的一些流程。 device一般是先于driver注册,但也不全是这样的顺序。Linux的Device和Driver的注册过程分别枚举挂在该BUS上所有的Dri... linux kernel中的DTS解析到platform_device的注册 在linux内核早期的时候,每个嵌入式系统的板载信息(总线,设备的寄存器地址等)都是hardcode在arch/<cpu>/match-...
Probe的规则是:如果BUS上实现了probe就用BUS的probe;否则才会用driver的probe。 Device一般是先于Driver注册,但也不全是这样的顺序。Linux的Device和Driver的注册过程分别枚举挂在该BUS上所有的Driver和Device实现了这种时序无关性。
做Linux方面也有三个多月了,对代码中的有些结构一直不是很明白,比如platform_device与platform_driver一直分不清关系。在网上搜了下,做个总结。两者的工作顺序是先定义platform_device -> 注册 platform_device->,再定义 platform_driver-> 注册 platform_driver。
driver_probe_device(drv, dev); 跑到driver_probe_device中去看看: 有一段很重要: if (drv->bus->match && !drv->bus->match(dev, drv)) goto Done; 明显,是调用的驱动的总线上的match函数。如果返回1,则可以继续,否则就Done了。 继承执行的话: ...
A driver for a low power probe type information storage device is provided to reduce the weight, decrease the driving power, and enhance the vertical strength by forming a lattice structure on a surface opposite to a recording surface of a middle transfer stick. A middle frame is connected to...
Re: [PATCH 1/2] serial: samsung: Move uart_register_driver call to device probe On 23.01.2014 19:40, Mark Brown wrote: On Thu, Jan 23, 2014 at 06:04:23PM +0000, Alan Cox wrote: We can then enable that config option for ARM (and in time for any other...
Re: [PATCH 1/2] serial: samsung: Move uart_register_driver call to device probe > I had earlier submitted a patch [1] to remove the hard coded > major/minor number for Samsung UART driver, but that was rejected > because of userspace breakage. Without this patch, Samsung UART driver...
Linux Device的注册最终都是通过device_register()实现,Driver的注册最终都是通过driver_register()实现。下图对照说明了Device和Driver的注册过程。 上面的图解一目了然,详细过程不再赘述。注意以下几点说明: BUS的p->drivers_autoprobe;1默认是true。 bus_for_each_drv()是对BUS上所有的Driver都进行__device_attach...
在上面的示例代码中,有compatible有两个值,会按照顺序匹配出现在第一个位置(本例中为nvidia,tegra186-eqos)上的driver,如果没有这个driver,就顺序匹配第二个名字的driver。 下面代码即为以上ethernet device的driver,当device和driver匹配上后,会执行504行定义的.probe回调,即dwc_eth_dwmac_probe,执行结束即完成网卡...