int driver_register( struct device_driver * drv) { klist_init( & drv -> klist_devices, klist_devices_get, klist_devices_put); init_completion( & drv -> unloaded); return bus_add_driver(drv); }
void driver_attach( struct device_driver * drv) { bus_for_each_dev(drv -> bus, NULL, drv, __driver_attach); }
static int pci_bus_match( struct device * dev, struct device_driver * drv) { struct pci_dev * pci_dev = to_pci_dev(dev); struct pci_driver * pci_drv = to_pci_driver(drv); const struct pci_device_id * found_id; found_id = pci_match_device(pci_drv, pci_dev); if (found_id) return 1 ; return 0 ; }
-------------------------------另解-----------------------------------------------------------------------------------------------
从driver_register看起,此处我的这里是:
int driver_register( struct device_driver * drv) { if ((drv -> bus -> probe && drv -> probe) || (drv -> bus -> remove && drv -> remove) || (drv -> bus -> shutdown && drv -> shutdown)) { printk(KERN_WARNING " Driver '%s' needs updating - please use bus_type methods\n " , drv -> name); } klist_init( & drv -> klist_devices, NULL, NULL); return bus_add_driver(drv); }
klist_init不相关,不用管他,具体再去看bus_add_driver:
int bus_add_driver( struct device_driver * drv) { // 1.先kobject_set_name(&drv->kobj, "%s", drv->name); // 2.再kobject_register(&drv->kobj) // 3.然后调用了:driver_attach(drv) }
int driver_attach( struct device_driver * drv) { return bus_for_each_dev(drv -> bus, NULL, drv, __driver_attach); }
真正起作用的是__driver_attach:
static int __driver_attach( struct device * dev, void * data) { ... if ( ! dev -> driver) driver_probe_device(drv, dev); ... } int driver_probe_device( struct device_driver * drv, struct device * dev) { ... // 1.先是判断bus是否match: if (drv -> bus -> match && ! drv -> bus -> match(dev, drv)) goto done; // 2.再具体执行probe: ret = really_probe(dev, drv); ... }
really_probe才是我们要找的函数:
static int really_probe( struct device * dev, struct device_driver * drv) { ... // 1.先是调用的驱动所属总线的probe函数: if (dev -> bus -> probe) { ret = dev -> bus -> probe(dev); if (ret) goto probe_failed; } else if (drv -> probe) { // 2.再调用你的驱动中的probe函数: ret = drv -> probe(dev); if (ret) goto probe_failed; } ... }
其中,drv->probe(dev),才是真正调用你的驱动实现的具体的probe函数。
也就是对应此文标题所问的,probe函数此时被调用。