Linux驱动 probe函数调用
来源:互联网 发布:水利水电设计院知乎 编辑:程序博客网 时间:2024/05/16 07:33
参考:
http://blog.chinaunix.net/space.php?uid=15887868&do=blog&id=2758294
http://www.cnblogs.com/hoys/archive/2011/04/01/2002299.html
1,driver_register把驱动注册到总线
/** * driver_register - register driver with bus * @drv: driver to register * We pass off most of the work to the bus_add_driver() call, * since most of the things we have to do deal with the bus * structures. */int driver_register(struct device_driver *drv){……………………if ((drv->bus->probe && drv->probe) || (drv->bus->remove && drv->remove) || (drv->bus->shutdown && drv->shutdown))ret = bus_add_driver(drv);//把drv驱动,注册到总线……………………}
2,驱动注册到总线的实现函数
/** * bus_add_driver - Add a driver to the bus. -----在总线上加入一个驱动 * @drv: driver. */int bus_add_driver(struct device_driver *drv){………………if (drv->bus->p->drivers_autoprobe) {error = driver_attach(drv); //驱动的匹配函数………………}3,driver_attach()
/** * driver_attach - try to bind driver to devices. * @drv: driver. * * Walk the list of devices that the bus has on it and try to * match the driver with each one. If driver_probe_device() * returns 0 and the @dev->driver is set, we've found a * compatible pair. */int driver_attach(struct device_driver *drv){return bus_for_each_dev(drv->bus, NULL, drv, __driver_attach);//注意这里的__driver_attach}EXPORT_SYMBOL_GPL(driver_attach);上面真正起作用的是__driver_attach:
static int __driver_attach(struct device *dev, void *data){struct device_driver *drv = data;/* * Lock device and try to bind to it. We drop the error * here and always return 0, because we need to keep trying * to bind to devices and some drivers will return an error * simply if it didn't support the device. * * driver_probe_device() will spit a warning if there * is an error. */if (!driver_match_device(drv, dev))return 0;if (dev->parent)/* Needed for USB */device_lock(dev->parent);device_lock(dev);if (!dev->driver)driver_probe_device(drv, dev);//看下这个函数的实现过程device_unlock(dev);if (dev->parent)device_unlock(dev->parent);return 0;}int driver_probe_device(structdevice_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);...}4,really_probe是我们真正要找的函数
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;} //2.再调用的驱动中的probe函数:else if (drv->probe) {ret = drv->probe(dev);if (ret)goto probe_failed;}driver_bound(dev);ret = 1;pr_debug("bus: '%s': %s: bound device %s to driver %s\n", drv->bus->name, __func__, dev_name(dev), drv->name);//这个信息可以看到我们注册的总 驱动、设备和总线 信息goto done;………………}
………………
[ 0.588087] bus: 'platform': really_probe: bound device power.0to driverpower //总线:platform 设备:power.0 驱动:power[ 0.661226] bus: 'platform': really_probe: bound device s3c24xx-pwm.0 to driver s3c24xx-pwm
[ 0.678552] bus: 'platform': really_probe: bound device s3c24xx-pwm.1 to driver s3c24xx-pwm
[ 0.695971] bus: 'platform': really_probe: bound device s3c24xx-pwm.2 to driver s3c24xx-pwm
[ 0.713389 bus: 'platform': really_probe: bound device s3c24xx-pwm.3 to driver
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