驱动中id_table的分析
一、I2C驱动probe
***i2c_device_id用于device与drive配对
static const struct i2c_device_id tps65010_id[] = {
{ "tps65010", TPS65010 },
{ "tps65011", TPS65011 },
{ "tps65012", TPS65012 },
{ "tps65013", TPS65013 },
{ "tps65014", TPS65011 }, /* tps65011 charging at 6.5V max */
{ }
};
MODULE_DEVICE_TABLE(i2c, tps65010_id);
static struct i2c_driver tps65010_driver = {
.driver = {
.name = "tps65010",
},
.probe = tps65010_probe, /* bus->match成功后调用 */
.remove = __exit_p(tps65010_remove),
.id_table = tps65010_id, /* 用于I2C driver的probe函数调用 */
};
struct bus_type i2c_bus_type = {
.name = "i2c",
.match = i2c_device_match,
.probe = i2c_device_probe,
.remove = i2c_device_remove,
.shutdown = i2c_device_shutdown,
.pm = &i2c_device_pm_ops,
};
int device_add(struct device *dev)-> bus_probe_device(dev)->
device_attach(dev)-> __device_attach->driver_match_device(drv, dev)
static inline int driver_match_device(struct device_driver *drv,
struct device *dev)
{
return drv->bus->match ? drv->bus->match(dev, drv) : 1;
}
->driver_probe_device->really_probe->dev->bus->probe(dev)
二、 input driver probe机制
input driver与input handler配对机制
static struct input_handler evbug_handler = {
.event = evbug_event,
.connect = evbug_connect,
.disconnect = evbug_disconnect,
.name = "evbug",
.id_table = evbug_ids,
};
static int __init evbug_init(void)
{
return input_register_handler(&evbug_handler);
}
input_attach_handler(dev, handler)-> input_match_device(handler, dev)-> handler->connect(handler, dev, id)
***handler & input driver连接成功
Author : Woodpecker <pecker.hu@gmail.com>
南京 2010-09-25 21:06